1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/debug.hpp"
29
30 // use this for flags that are true per default in the tiered build
31 // but false in non-tiered builds, and vice versa
32 #ifdef TIERED
33 #define trueInTiered true
34 #define falseInTiered false
35 #else
36 #define trueInTiered false
37 #define falseInTiered true
38 #endif
39
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_ARCH_aarch64
56 # include "globals_aarch64.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_linux
59 # include "globals_linux.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_solaris
62 # include "globals_solaris.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_windows
65 # include "globals_windows.hpp"
66 #endif
67 #ifdef TARGET_OS_FAMILY_aix
68 # include "globals_aix.hpp"
69 #endif
70 #ifdef TARGET_OS_FAMILY_bsd
71 # include "globals_bsd.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_x86
74 # include "globals_linux_x86.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_linux_sparc
77 # include "globals_linux_sparc.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_linux_zero
80 # include "globals_linux_zero.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_solaris_x86
83 # include "globals_solaris_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_solaris_sparc
86 # include "globals_solaris_sparc.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_windows_x86
89 # include "globals_windows_x86.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_linux_arm
92 # include "globals_linux_arm.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_linux_ppc
95 # include "globals_linux_ppc.hpp"
96 #endif
97 #ifdef TARGET_OS_ARCH_linux_aarch64
98 # include "globals_linux_aarch64.hpp"
99 #endif
100 #ifdef TARGET_OS_ARCH_aix_ppc
101 # include "globals_aix_ppc.hpp"
102 #endif
103 #ifdef TARGET_OS_ARCH_bsd_x86
104 # include "globals_bsd_x86.hpp"
105 #endif
106 #ifdef TARGET_OS_ARCH_bsd_zero
107 # include "globals_bsd_zero.hpp"
108 #endif
109 #ifdef COMPILER1
110 #ifdef TARGET_ARCH_x86
111 # include "c1_globals_x86.hpp"
112 #endif
113 #ifdef TARGET_ARCH_sparc
114 # include "c1_globals_sparc.hpp"
115 #endif
116 #ifdef TARGET_ARCH_arm
117 # include "c1_globals_arm.hpp"
118 #endif
119 #ifdef TARGET_ARCH_aarch64
120 # include "c1_globals_aarch64.hpp"
121 #endif
122 #ifdef TARGET_OS_FAMILY_linux
123 # include "c1_globals_linux.hpp"
124 #endif
125 #ifdef TARGET_OS_FAMILY_solaris
126 # include "c1_globals_solaris.hpp"
127 #endif
128 #ifdef TARGET_OS_FAMILY_windows
129 # include "c1_globals_windows.hpp"
130 #endif
131 #ifdef TARGET_OS_FAMILY_aix
132 # include "c1_globals_aix.hpp"
133 #endif
134 #ifdef TARGET_OS_FAMILY_bsd
135 # include "c1_globals_bsd.hpp"
136 #endif
137 #ifdef TARGET_ARCH_ppc
138 # include "c1_globals_ppc.hpp"
139 #endif
140 #endif
141 #ifdef COMPILER2
142 #ifdef TARGET_ARCH_x86
143 # include "c2_globals_x86.hpp"
144 #endif
145 #ifdef TARGET_ARCH_sparc
146 # include "c2_globals_sparc.hpp"
147 #endif
148 #ifdef TARGET_ARCH_arm
149 # include "c2_globals_arm.hpp"
150 #endif
151 #ifdef TARGET_ARCH_ppc
152 # include "c2_globals_ppc.hpp"
153 #endif
154 #ifdef TARGET_ARCH_aarch64
155 # include "c2_globals_aarch64.hpp"
156 #endif
157 #ifdef TARGET_OS_FAMILY_linux
158 # include "c2_globals_linux.hpp"
159 #endif
160 #ifdef TARGET_OS_FAMILY_solaris
161 # include "c2_globals_solaris.hpp"
162 #endif
163 #ifdef TARGET_OS_FAMILY_windows
164 # include "c2_globals_windows.hpp"
165 #endif
166 #ifdef TARGET_OS_FAMILY_aix
167 # include "c2_globals_aix.hpp"
168 #endif
169 #ifdef TARGET_OS_FAMILY_bsd
170 # include "c2_globals_bsd.hpp"
171 #endif
172 #endif
173 #ifdef SHARK
174 #ifdef TARGET_ARCH_zero
175 # include "shark_globals_zero.hpp"
176 #endif
177 #endif
178
179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
180 define_pd_global(bool, BackgroundCompilation, false);
181 define_pd_global(bool, UseTLAB, false);
182 define_pd_global(bool, CICompileOSR, false);
183 define_pd_global(bool, UseTypeProfile, false);
184 define_pd_global(bool, UseOnStackReplacement, false);
185 define_pd_global(bool, InlineIntrinsics, false);
186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
187 define_pd_global(bool, ProfileInterpreter, false);
188 define_pd_global(bool, ProfileTraps, false);
189 define_pd_global(bool, TieredCompilation, false);
190
191 define_pd_global(intx, CompileThreshold, 0);
192
193 define_pd_global(intx, OnStackReplacePercentage, 0);
194 define_pd_global(bool, ResizeTLAB, false);
195 define_pd_global(intx, FreqInlineSize, 0);
196 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
197 define_pd_global(intx, InlineClassNatives, true);
198 define_pd_global(intx, InlineUnsafeOps, true);
199 define_pd_global(intx, InitialCodeCacheSize, 160*K);
200 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
201 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
202 define_pd_global(intx, ProfiledCodeHeapSize, 0);
203 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
204
205 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
206 define_pd_global(intx, CodeCacheMinBlockLength, 1);
207 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
208 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
209 define_pd_global(bool, NeverActAsServerClassMachine, true);
210 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
211 #define CI_COMPILER_COUNT 0
212 #else
213
214 #ifdef COMPILER2
215 #define CI_COMPILER_COUNT 2
216 #else
217 #define CI_COMPILER_COUNT 1
218 #endif // COMPILER2
219
220 #endif // no compilers
221
222 // string type aliases used only in this file
223 typedef const char* ccstr;
224 typedef const char* ccstrlist; // represents string arguments which accumulate
225
226 struct Flag {
227 enum Flags {
228 // value origin
229 DEFAULT = 0,
230 COMMAND_LINE = 1,
231 ENVIRON_VAR = 2,
232 CONFIG_FILE = 3,
233 MANAGEMENT = 4,
234 ERGONOMIC = 5,
235 ATTACH_ON_DEMAND = 6,
236 INTERNAL = 7,
237
238 LAST_VALUE_ORIGIN = INTERNAL,
239 VALUE_ORIGIN_BITS = 4,
240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
241
242 // flag kind
243 KIND_PRODUCT = 1 << 4,
244 KIND_MANAGEABLE = 1 << 5,
245 KIND_DIAGNOSTIC = 1 << 6,
246 KIND_EXPERIMENTAL = 1 << 7,
247 KIND_NOT_PRODUCT = 1 << 8,
248 KIND_DEVELOP = 1 << 9,
249 KIND_PLATFORM_DEPENDENT = 1 << 10,
250 KIND_READ_WRITE = 1 << 11,
251 KIND_C1 = 1 << 12,
252 KIND_C2 = 1 << 13,
253 KIND_ARCH = 1 << 14,
254 KIND_SHARK = 1 << 15,
255 KIND_LP64_PRODUCT = 1 << 16,
256 KIND_COMMERCIAL = 1 << 17,
257
258 KIND_MASK = ~VALUE_ORIGIN_MASK
259 };
260
261 enum Error {
262 // no error
263 SUCCESS = 0,
264 // flag name is missing
265 MISSING_NAME,
266 // flag value is missing
267 MISSING_VALUE,
268 // error parsing the textual form of the value
269 WRONG_FORMAT,
270 // flag is not writeable
271 NON_WRITABLE,
272 // flag value is outside of its bounds
273 OUT_OF_BOUNDS,
274 // flag value violates its constraint
275 VIOLATES_CONSTRAINT,
276 // there is no flag with the given name
277 INVALID_FLAG,
278 // other, unspecified error related to setting the flag
279 ERR_OTHER
280 };
281
282 const char* _type;
283 const char* _name;
284 void* _addr;
285 NOT_PRODUCT(const char* _doc;)
286 Flags _flags;
287
288 // points to all Flags static array
289 static Flag* flags;
290
291 // number of flags
292 static size_t numFlags;
293
294 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
295 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
296 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
297
298 void check_writable();
299
300 bool is_bool() const;
301 bool get_bool() const;
302 void set_bool(bool value);
303
304 bool is_int() const;
305 int get_int() const;
306 void set_int(int value);
307
308 bool is_uint() const;
309 uint get_uint() const;
310 void set_uint(uint value);
311
312 bool is_intx() const;
313 intx get_intx() const;
314 void set_intx(intx value);
315
316 bool is_uintx() const;
317 uintx get_uintx() const;
318 void set_uintx(uintx value);
319
320 bool is_uint64_t() const;
321 uint64_t get_uint64_t() const;
322 void set_uint64_t(uint64_t value);
323
324 bool is_size_t() const;
325 size_t get_size_t() const;
326 void set_size_t(size_t value);
327
328 bool is_double() const;
329 double get_double() const;
330 void set_double(double value);
331
332 bool is_ccstr() const;
333 bool ccstr_accumulates() const;
334 ccstr get_ccstr() const;
335 void set_ccstr(ccstr value);
336
337 Flags get_origin();
338 void set_origin(Flags origin);
339
340 bool is_default();
341 bool is_ergonomic();
342 bool is_command_line();
343
344 bool is_product() const;
345 bool is_manageable() const;
346 bool is_diagnostic() const;
347 bool is_experimental() const;
348 bool is_notproduct() const;
349 bool is_develop() const;
350 bool is_read_write() const;
351 bool is_commercial() const;
352
353 bool is_constant_in_binary() const;
354
355 bool is_unlocker() const;
356 bool is_unlocked() const;
357 bool is_writeable() const;
358 bool is_external() const;
359
360 bool is_unlocker_ext() const;
361 bool is_unlocked_ext() const;
362 bool is_writeable_ext() const;
363 bool is_external_ext() const;
364
365 void unlock_diagnostic();
366
367 void get_locked_message(char*, int) const;
368 void get_locked_message_ext(char*, int) const;
369
370 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
371 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
372 void print_kind(outputStream* st);
373 void print_as_flag(outputStream* st);
374
375 static const char* flag_error_str(Flag::Error error);
376 };
377
378 // debug flags control various aspects of the VM and are global accessible
379
380 // use FlagSetting to temporarily change some debug flag
381 // e.g. FlagSetting fs(DebugThisAndThat, true);
382 // restored to previous value upon leaving scope
383 class FlagSetting {
384 bool val;
385 bool* flag;
386 public:
387 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
388 ~FlagSetting() { *flag = val; }
389 };
390
391
392 class CounterSetting {
393 intx* counter;
394 public:
395 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
396 ~CounterSetting() { (*counter)--; }
397 };
398
399 class IntFlagSetting {
400 int val;
401 int* flag;
402 public:
403 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
404 ~IntFlagSetting() { *flag = val; }
405 };
406
407 class UIntFlagSetting {
408 uint val;
409 uint* flag;
410 public:
411 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
412 ~UIntFlagSetting() { *flag = val; }
413 };
414
415 class UIntXFlagSetting {
416 uintx val;
417 uintx* flag;
418 public:
419 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
420 ~UIntXFlagSetting() { *flag = val; }
421 };
422
423 class DoubleFlagSetting {
424 double val;
425 double* flag;
426 public:
427 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
428 ~DoubleFlagSetting() { *flag = val; }
429 };
430
431 class SizeTFlagSetting {
432 size_t val;
433 size_t* flag;
434 public:
435 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
436 ~SizeTFlagSetting() { *flag = val; }
437 };
438
439
440 class CommandLineFlags {
441 public:
442 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
443 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
444 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
445 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
446
447 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
448 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); }
449 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
450 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
451
452 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
453 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
454 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
455 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
456
457 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
458 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
459 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
460 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
461
462 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
463 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
464 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
465 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
466
467 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
468 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
469 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
470 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
471
472 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
473 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
474 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
475 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
476
477 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
478 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
479 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
480 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
481
482 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
483 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
484 // Contract: Flag will make private copy of the incoming value.
485 // Outgoing value is always malloc-ed, and caller MUST call free.
486 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
487 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
488
489 // Returns false if name is not a command line flag.
490 static bool wasSetOnCmdline(const char* name, bool* value);
491 static void printSetFlags(outputStream* out);
492
493 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
494 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
495
496 static void verify() PRODUCT_RETURN;
497 };
498
499 // use this for flags that are true by default in the debug version but
500 // false in the optimized version, and vice versa
501 #ifdef ASSERT
502 #define trueInDebug true
503 #define falseInDebug false
504 #else
505 #define trueInDebug false
506 #define falseInDebug true
507 #endif
508
509 // use this for flags that are true per default in the product build
510 // but false in development builds, and vice versa
511 #ifdef PRODUCT
512 #define trueInProduct true
513 #define falseInProduct false
514 #else
515 #define trueInProduct false
516 #define falseInProduct true
517 #endif
518
519 #ifdef JAVASE_EMBEDDED
520 #define falseInEmbedded false
521 #else
522 #define falseInEmbedded true
523 #endif
524
525 // develop flags are settable / visible only during development and are constant in the PRODUCT version
526 // product flags are always settable / visible
527 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
528
529 // A flag must be declared with one of the following types:
530 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
531 // The type "ccstr" is an alias for "const char*" and is used
532 // only in this file, because the macrology requires single-token type names.
533
534 // Note: Diagnostic options not meant for VM tuning or for product modes.
535 // They are to be used for VM quality assurance or field diagnosis
536 // of VM bugs. They are hidden so that users will not be encouraged to
537 // try them as if they were VM ordinary execution options. However, they
538 // are available in the product version of the VM. Under instruction
539 // from support engineers, VM customers can turn them on to collect
540 // diagnostic information about VM problems. To use a VM diagnostic
541 // option, you must first specify +UnlockDiagnosticVMOptions.
542 // (This master switch also affects the behavior of -Xprintflags.)
543 //
544 // experimental flags are in support of features that are not
545 // part of the officially supported product, but are available
546 // for experimenting with. They could, for example, be performance
547 // features that may not have undergone full or rigorous QA, but which may
548 // help performance in some cases and released for experimentation
549 // by the community of users and developers. This flag also allows one to
550 // be able to build a fully supported product that nonetheless also
551 // ships with some unsupported, lightly tested, experimental features.
552 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
553 // UnlockExperimentalVMOptions flag, which allows the control and
554 // modification of the experimental flags.
555 //
556 // Nota bene: neither diagnostic nor experimental options should be used casually,
557 // and they are not supported on production loads, except under explicit
558 // direction from support engineers.
559 //
560 // manageable flags are writeable external product flags.
561 // They are dynamically writeable through the JDK management interface
562 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
563 // These flags are external exported interface (see CCC). The list of
564 // manageable flags can be queried programmatically through the management
565 // interface.
566 //
567 // A flag can be made as "manageable" only if
568 // - the flag is defined in a CCC as an external exported interface.
569 // - the VM implementation supports dynamic setting of the flag.
570 // This implies that the VM must *always* query the flag variable
571 // and not reuse state related to the flag state at any given time.
572 // - you want the flag to be queried programmatically by the customers.
573 //
574 // product_rw flags are writeable internal product flags.
575 // They are like "manageable" flags but for internal/private use.
576 // The list of product_rw flags are internal/private flags which
577 // may be changed/removed in a future release. It can be set
578 // through the management interface to get/set value
579 // when the name of flag is supplied.
580 //
581 // A flag can be made as "product_rw" only if
582 // - the VM implementation supports dynamic setting of the flag.
583 // This implies that the VM must *always* query the flag variable
584 // and not reuse state related to the flag state at any given time.
585 //
586 // Note that when there is a need to support develop flags to be writeable,
587 // it can be done in the same way as product_rw.
588 //
589 // range is a macro that will expand to min and max arguments for range
590 // checking code if provided - see commandLineFlagRangeList.hpp
591 //
592 // constraint is a macro that will expand to custom function call
593 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
594 //
595
596 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
597 \
598 lp64_product(bool, UseCompressedOops, false, \
599 "Use 32-bit object references in 64-bit VM. " \
600 "lp64_product means flag is always constant in 32 bit VM") \
601 \
602 lp64_product(bool, UseCompressedClassPointers, false, \
603 "Use 32-bit class pointers in 64-bit VM. " \
604 "lp64_product means flag is always constant in 32 bit VM") \
605 \
606 notproduct(bool, CheckCompressedOops, true, \
607 "Generate checks in encoding/decoding code in debug VM") \
608 \
609 product_pd(size_t, HeapBaseMinAddress, \
610 "OS specific low limit for heap base address") \
611 \
612 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
613 "Heap allocation steps through preferred address regions to find" \
614 " where it can allocate the heap. Number of steps to take per " \
615 "region.") \
616 range(1, max_uintx) \
617 \
618 diagnostic(bool, PrintCompressedOopsMode, false, \
619 "Print compressed oops base address and encoding mode") \
620 \
621 lp64_product(intx, ObjectAlignmentInBytes, 8, \
622 "Default object alignment in bytes, 8 is minimum") \
623 range(8, 256) \
624 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
625 \
626 product(bool, AssumeMP, false, \
627 "Instruct the VM to assume multiple processors are available") \
628 \
629 /* UseMembar is theoretically a temp flag used for memory barrier */ \
630 /* removal testing. It was supposed to be removed before FCS but has */ \
631 /* been re-added (see 6401008) */ \
632 product_pd(bool, UseMembar, \
633 "(Unstable) Issues membars on thread state transitions") \
634 \
635 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
636 "Clean the chunk pool asynchronously") \
637 \
638 experimental(bool, AlwaysSafeConstructors, false, \
639 "Force safe construction, as if all fields are final.") \
640 \
641 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
642 "Enable normal processing of flags relating to field diagnostics")\
643 \
644 experimental(bool, UnlockExperimentalVMOptions, false, \
645 "Enable normal processing of flags relating to experimental " \
646 "features") \
647 \
648 product(bool, JavaMonitorsInStackTrace, true, \
649 "Print information about Java monitor locks when the stacks are" \
650 "dumped") \
651 \
652 product_pd(bool, UseLargePages, \
653 "Use large page memory") \
654 \
655 product_pd(bool, UseLargePagesIndividualAllocation, \
656 "Allocate large pages individually for better affinity") \
657 \
658 develop(bool, LargePagesIndividualAllocationInjectError, false, \
659 "Fail large pages individual allocation") \
660 \
661 product(bool, UseLargePagesInMetaspace, false, \
662 "Use large page memory in metaspace. " \
663 "Only used if UseLargePages is enabled.") \
664 \
665 develop(bool, TracePageSizes, false, \
666 "Trace page size selection and usage") \
667 \
668 product(bool, UseNUMA, false, \
669 "Use NUMA if available") \
670 \
671 product(bool, UseNUMAInterleaving, false, \
672 "Interleave memory across NUMA nodes if available") \
673 \
674 product(size_t, NUMAInterleaveGranularity, 2*M, \
675 "Granularity to use for NUMA interleaving on Windows OS") \
676 \
677 product(bool, ForceNUMA, false, \
678 "Force NUMA optimizations on single-node/UMA systems") \
679 \
680 product(uintx, NUMAChunkResizeWeight, 20, \
681 "Percentage (0-100) used to weight the current sample when " \
682 "computing exponentially decaying average for " \
683 "AdaptiveNUMAChunkSizing") \
684 range(0, 100) \
685 \
686 product(size_t, NUMASpaceResizeRate, 1*G, \
687 "Do not reallocate more than this amount per collection") \
688 \
689 product(bool, UseAdaptiveNUMAChunkSizing, true, \
690 "Enable adaptive chunk sizing for NUMA") \
691 \
692 product(bool, NUMAStats, false, \
693 "Print NUMA stats in detailed heap information") \
694 \
695 product(uintx, NUMAPageScanRate, 256, \
696 "Maximum number of pages to include in the page scan procedure") \
697 \
698 product_pd(bool, NeedsDeoptSuspend, \
699 "True for register window machines (sparc/ia64)") \
700 \
701 product(intx, UseSSE, 99, \
702 "Highest supported SSE instructions set on x86/x64") \
703 \
704 product(bool, UseAES, false, \
705 "Control whether AES instructions can be used on x86/x64") \
706 \
707 product(bool, UseSHA, false, \
708 "Control whether SHA instructions can be used " \
709 "on SPARC and on ARM") \
710 \
711 product(bool, UseGHASHIntrinsics, false, \
712 "Use intrinsics for GHASH versions of crypto") \
713 \
714 product(size_t, LargePageSizeInBytes, 0, \
715 "Large page size (0 to let VM choose the page size)") \
716 \
717 product(size_t, LargePageHeapSizeThreshold, 128*M, \
718 "Use large pages if maximum heap is at least this big") \
719 \
720 product(bool, ForceTimeHighResolution, false, \
721 "Using high time resolution (for Win32 only)") \
722 \
723 develop(bool, TraceItables, false, \
724 "Trace initialization and use of itables") \
725 \
726 develop(bool, TracePcPatching, false, \
727 "Trace usage of frame::patch_pc") \
728 \
729 develop(bool, TraceJumps, false, \
730 "Trace assembly jumps in thread ring buffer") \
731 \
732 develop(bool, TraceRelocator, false, \
733 "Trace the bytecode relocator") \
734 \
735 develop(bool, TraceLongCompiles, false, \
736 "Print out every time compilation is longer than " \
737 "a given threshold") \
738 \
739 develop(bool, SafepointALot, false, \
740 "Generate a lot of safepoints. This works with " \
741 "GuaranteedSafepointInterval") \
742 \
743 product_pd(bool, BackgroundCompilation, \
744 "A thread requesting compilation is not blocked during " \
745 "compilation") \
746 \
747 product(bool, PrintVMQWaitTime, false, \
748 "Print out the waiting time in VM operation queue") \
749 \
750 develop(bool, TraceOopMapGeneration, false, \
751 "Show OopMapGeneration") \
752 \
753 product(bool, MethodFlushing, true, \
754 "Reclamation of zombie and not-entrant methods") \
755 \
756 develop(bool, VerifyStack, false, \
757 "Verify stack of each thread when it is entering a runtime call") \
758 \
759 diagnostic(bool, ForceUnreachable, false, \
760 "Make all non code cache addresses to be unreachable by " \
761 "forcing use of 64bit literal fixups") \
762 \
763 notproduct(bool, StressDerivedPointers, false, \
764 "Force scavenge when a derived pointer is detected on stack " \
765 "after rtm call") \
766 \
767 develop(bool, TraceDerivedPointers, false, \
768 "Trace traversal of derived pointers on stack") \
769 \
770 notproduct(bool, TraceCodeBlobStacks, false, \
771 "Trace stack-walk of codeblobs") \
772 \
773 product(bool, PrintJNIResolving, false, \
774 "Used to implement -v:jni") \
775 \
776 notproduct(bool, PrintRewrites, false, \
777 "Print methods that are being rewritten") \
778 \
779 product(bool, UseInlineCaches, true, \
780 "Use Inline Caches for virtual calls ") \
781 \
782 develop(bool, InlineArrayCopy, true, \
783 "Inline arraycopy native that is known to be part of " \
784 "base library DLL") \
785 \
786 develop(bool, InlineObjectHash, true, \
787 "Inline Object::hashCode() native that is known to be part " \
788 "of base library DLL") \
789 \
790 develop(bool, InlineNatives, true, \
791 "Inline natives that are known to be part of base library DLL") \
792 \
793 develop(bool, InlineMathNatives, true, \
794 "Inline SinD, CosD, etc.") \
795 \
796 develop(bool, InlineClassNatives, true, \
797 "Inline Class.isInstance, etc") \
798 \
799 develop(bool, InlineThreadNatives, true, \
800 "Inline Thread.currentThread, etc") \
801 \
802 develop(bool, InlineUnsafeOps, true, \
803 "Inline memory ops (native methods) from sun.misc.Unsafe") \
804 \
805 product(bool, CriticalJNINatives, true, \
806 "Check for critical JNI entry points") \
807 \
808 notproduct(bool, StressCriticalJNINatives, false, \
809 "Exercise register saving code in critical natives") \
810 \
811 product(bool, UseSSE42Intrinsics, false, \
812 "SSE4.2 versions of intrinsics") \
813 \
814 product(bool, UseAESIntrinsics, false, \
815 "Use intrinsics for AES versions of crypto") \
816 \
817 product(bool, UseSHA1Intrinsics, false, \
818 "Use intrinsics for SHA-1 crypto hash function. " \
819 "Requires that UseSHA is enabled.") \
820 \
821 product(bool, UseSHA256Intrinsics, false, \
822 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
823 "Requires that UseSHA is enabled.") \
824 \
825 product(bool, UseSHA512Intrinsics, false, \
826 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
827 "Requires that UseSHA is enabled.") \
828 \
829 product(bool, UseCRC32Intrinsics, false, \
830 "use intrinsics for java.util.zip.CRC32") \
831 \
832 product(bool, UseCRC32CIntrinsics, false, \
833 "use intrinsics for java.util.zip.CRC32C") \
834 \
835 product(bool, UseAdler32Intrinsics, false, \
836 "use intrinsics for java.util.zip.Adler32") \
837 \
838 diagnostic(ccstrlist, DisableIntrinsic, "", \
839 "do not expand intrinsics whose (internal) names appear here") \
840 \
841 develop(bool, TraceCallFixup, false, \
842 "Trace all call fixups") \
843 \
844 develop(bool, DeoptimizeALot, false, \
845 "Deoptimize at every exit from the runtime system") \
846 \
847 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
848 "A comma separated list of bcis to deoptimize at") \
849 \
850 product(bool, DeoptimizeRandom, false, \
851 "Deoptimize random frames on random exit from the runtime system")\
852 \
853 notproduct(bool, ZombieALot, false, \
854 "Create zombies (non-entrant) at exit from the runtime system") \
855 \
856 product(bool, UnlinkSymbolsALot, false, \
857 "Unlink unreferenced symbols from the symbol table at safepoints")\
858 \
859 notproduct(bool, WalkStackALot, false, \
860 "Trace stack (no print) at every exit from the runtime system") \
861 \
862 product(bool, Debugging, false, \
863 "Set when executing debug methods in debug.cpp " \
864 "(to prevent triggering assertions)") \
865 \
866 notproduct(bool, StrictSafepointChecks, trueInDebug, \
867 "Enable strict checks that safepoints cannot happen for threads " \
868 "that use No_Safepoint_Verifier") \
869 \
870 notproduct(bool, VerifyLastFrame, false, \
871 "Verify oops on last frame on entry to VM") \
872 \
873 develop(bool, TraceHandleAllocation, false, \
874 "Print out warnings when suspiciously many handles are allocated")\
875 \
876 product(bool, FailOverToOldVerifier, true, \
877 "Fail over to old verifier when split verifier fails") \
878 \
879 develop(bool, ShowSafepointMsgs, false, \
880 "Show message about safepoint synchronization") \
881 \
882 product(bool, SafepointTimeout, false, \
883 "Time out and warn or fail after SafepointTimeoutDelay " \
884 "milliseconds if failed to reach safepoint") \
885 \
886 develop(bool, DieOnSafepointTimeout, false, \
887 "Die upon failure to reach safepoint (see SafepointTimeout)") \
888 \
889 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
890 /* typically, at most a few retries are needed */ \
891 product(intx, SuspendRetryCount, 50, \
892 "Maximum retry count for an external suspend request") \
893 \
894 product(intx, SuspendRetryDelay, 5, \
895 "Milliseconds to delay per retry (* current_retry_count)") \
896 \
897 product(bool, AssertOnSuspendWaitFailure, false, \
898 "Assert/Guarantee on external suspend wait failure") \
899 \
900 product(bool, TraceSuspendWaitFailures, false, \
901 "Trace external suspend wait failures") \
902 \
903 product(bool, MaxFDLimit, true, \
904 "Bump the number of file descriptors to maximum in Solaris") \
905 \
906 diagnostic(bool, LogEvents, true, \
907 "Enable the various ring buffer event logs") \
908 \
909 diagnostic(uintx, LogEventsBufferEntries, 10, \
910 "Number of ring buffer event logs") \
911 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
912 \
913 product(bool, BytecodeVerificationRemote, true, \
914 "Enable the Java bytecode verifier for remote classes") \
915 \
916 product(bool, BytecodeVerificationLocal, false, \
917 "Enable the Java bytecode verifier for local classes") \
918 \
919 develop(bool, ForceFloatExceptions, trueInDebug, \
920 "Force exceptions on FP stack under/overflow") \
921 \
922 develop(bool, VerifyStackAtCalls, false, \
923 "Verify that the stack pointer is unchanged after calls") \
924 \
925 develop(bool, TraceJavaAssertions, false, \
926 "Trace java language assertions") \
927 \
928 notproduct(bool, CheckAssertionStatusDirectives, false, \
929 "Temporary - see javaClasses.cpp") \
930 \
931 notproduct(bool, PrintMallocFree, false, \
932 "Trace calls to C heap malloc/free allocation") \
933 \
934 product(bool, PrintOopAddress, false, \
935 "Always print the location of the oop") \
936 \
937 notproduct(bool, VerifyCodeCache, false, \
938 "Verify code cache on memory allocation/deallocation") \
939 \
940 develop(bool, ZapDeadCompiledLocals, false, \
941 "Zap dead locals in compiler frames") \
942 \
943 notproduct(bool, ZapDeadLocalsOld, false, \
944 "Zap dead locals (old version, zaps all frames when " \
945 "entering the VM") \
946 \
947 notproduct(bool, CheckOopishValues, false, \
948 "Warn if value contains oop (requires ZapDeadLocals)") \
949 \
950 develop(bool, UseMallocOnly, false, \
951 "Use only malloc/free for allocation (no resource area/arena)") \
952 \
953 develop(bool, PrintMalloc, false, \
954 "Print all malloc/free calls") \
955 \
956 develop(bool, PrintMallocStatistics, false, \
957 "Print malloc/free statistics") \
958 \
959 develop(bool, ZapResourceArea, trueInDebug, \
960 "Zap freed resource/arena space with 0xABABABAB") \
961 \
962 notproduct(bool, ZapVMHandleArea, trueInDebug, \
963 "Zap freed VM handle space with 0xBCBCBCBC") \
964 \
965 develop(bool, ZapJNIHandleArea, trueInDebug, \
966 "Zap freed JNI handle space with 0xFEFEFEFE") \
967 \
968 notproduct(bool, ZapStackSegments, trueInDebug, \
969 "Zap allocated/freed stack segments with 0xFADFADED") \
970 \
971 develop(bool, ZapUnusedHeapArea, trueInDebug, \
972 "Zap unused heap space with 0xBAADBABE") \
973 \
974 develop(bool, TraceZapUnusedHeapArea, false, \
975 "Trace zapping of unused heap space") \
976 \
977 develop(bool, CheckZapUnusedHeapArea, false, \
978 "Check zapping of unused heap space") \
979 \
980 develop(bool, ZapFillerObjects, trueInDebug, \
981 "Zap filler objects with 0xDEAFBABE") \
982 \
983 develop(bool, PrintVMMessages, true, \
984 "Print VM messages on console") \
985 \
986 product(bool, PrintGCApplicationConcurrentTime, false, \
987 "Print the time the application has been running") \
988 \
989 product(bool, PrintGCApplicationStoppedTime, false, \
990 "Print the time the application has been stopped") \
991 \
992 diagnostic(bool, VerboseVerification, false, \
993 "Display detailed verification details") \
994 \
995 notproduct(uintx, ErrorHandlerTest, 0, \
996 "If > 0, provokes an error after VM initialization; the value " \
997 "determines which error to provoke. See test_error_handler() " \
998 "in debug.cpp.") \
999 \
1000 notproduct(uintx, TestCrashInErrorHandler, 0, \
1001 "If > 0, provokes an error inside VM error handler (a secondary " \
1002 "crash). see test_error_handler() in debug.cpp.") \
1003 \
1004 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1005 "If true, tests SafeFetch inside error handler.") \
1006 \
1007 develop(bool, Verbose, false, \
1008 "Print additional debugging information from other modes") \
1009 \
1010 develop(bool, PrintMiscellaneous, false, \
1011 "Print uncategorized debugging information (requires +Verbose)") \
1012 \
1013 develop(bool, WizardMode, false, \
1014 "Print much more debugging information") \
1015 \
1016 product(bool, ShowMessageBoxOnError, false, \
1017 "Keep process alive on VM fatal error") \
1018 \
1019 product(bool, CreateCoredumpOnCrash, true, \
1020 "Create core/mini dump on VM fatal error") \
1021 \
1022 product(uintx, ErrorLogTimeout, 2 * 60, \
1023 "Timeout, in seconds, to limit the time spent on writing an " \
1024 "error log in case of a crash.") \
1025 \
1026 product_pd(bool, UseOSErrorReporting, \
1027 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1028 \
1029 product(bool, SuppressFatalErrorMessage, false, \
1030 "Report NO fatal error message (avoid deadlock)") \
1031 \
1032 product(ccstrlist, OnError, "", \
1033 "Run user-defined commands on fatal error; see VMError.cpp " \
1034 "for examples") \
1035 \
1036 product(ccstrlist, OnOutOfMemoryError, "", \
1037 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1038 \
1039 manageable(bool, HeapDumpBeforeFullGC, false, \
1040 "Dump heap to file before any major stop-the-world GC") \
1041 \
1042 manageable(bool, HeapDumpAfterFullGC, false, \
1043 "Dump heap to file after any major stop-the-world GC") \
1044 \
1045 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1046 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1047 \
1048 manageable(ccstr, HeapDumpPath, NULL, \
1049 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1050 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1051 "in the working directory)") \
1052 \
1053 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1054 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1055 "when the heap usage is larger than this") \
1056 \
1057 develop(size_t, HeapDumpSegmentSize, 1*G, \
1058 "Approximate segment size when generating a segmented heap dump") \
1059 \
1060 develop(bool, BreakAtWarning, false, \
1061 "Execute breakpoint upon encountering VM warning") \
1062 \
1063 develop(bool, TraceVMOperation, false, \
1064 "Trace VM operations") \
1065 \
1066 develop(bool, UseFakeTimers, false, \
1067 "Tell whether the VM should use system time or a fake timer") \
1068 \
1069 product(ccstr, NativeMemoryTracking, "off", \
1070 "Native memory tracking options") \
1071 \
1072 diagnostic(bool, PrintNMTStatistics, false, \
1073 "Print native memory tracking summary data if it is on") \
1074 \
1075 diagnostic(bool, LogCompilation, false, \
1076 "Log compilation activity in detail to LogFile") \
1077 \
1078 product(bool, PrintCompilation, false, \
1079 "Print compilations") \
1080 \
1081 diagnostic(bool, TraceNMethodInstalls, false, \
1082 "Trace nmethod installation") \
1083 \
1084 diagnostic(intx, ScavengeRootsInCode, 2, \
1085 "0: do not allow scavengable oops in the code cache; " \
1086 "1: allow scavenging from the code cache; " \
1087 "2: emit as many constants as the compiler can see") \
1088 range(0, 2) \
1089 \
1090 product(bool, AlwaysRestoreFPU, false, \
1091 "Restore the FPU control word after every JNI call (expensive)") \
1092 \
1093 diagnostic(bool, PrintCompilation2, false, \
1094 "Print additional statistics per compilation") \
1095 \
1096 diagnostic(bool, PrintAdapterHandlers, false, \
1097 "Print code generated for i2c/c2i adapters") \
1098 \
1099 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1100 "Verify that i2c/c2i adapters are called properly") \
1101 \
1102 develop(bool, VerifyAdapterSharing, false, \
1103 "Verify that the code for shared adapters is the equivalent") \
1104 \
1105 diagnostic(bool, PrintAssembly, false, \
1106 "Print assembly code (using external disassembler.so)") \
1107 \
1108 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1109 "Print options string passed to disassembler.so") \
1110 \
1111 diagnostic(bool, PrintNMethods, false, \
1112 "Print assembly code for nmethods when generated") \
1113 \
1114 diagnostic(bool, PrintNativeNMethods, false, \
1115 "Print assembly code for native nmethods when generated") \
1116 \
1117 develop(bool, PrintDebugInfo, false, \
1118 "Print debug information for all nmethods when generated") \
1119 \
1120 develop(bool, PrintRelocations, false, \
1121 "Print relocation information for all nmethods when generated") \
1122 \
1123 develop(bool, PrintDependencies, false, \
1124 "Print dependency information for all nmethods when generated") \
1125 \
1126 develop(bool, PrintExceptionHandlers, false, \
1127 "Print exception handler tables for all nmethods when generated") \
1128 \
1129 develop(bool, StressCompiledExceptionHandlers, false, \
1130 "Exercise compiled exception handlers") \
1131 \
1132 develop(bool, InterceptOSException, false, \
1133 "Start debugger when an implicit OS (e.g. NULL) " \
1134 "exception happens") \
1135 \
1136 product(bool, PrintCodeCache, false, \
1137 "Print the code cache memory usage when exiting") \
1138 \
1139 develop(bool, PrintCodeCache2, false, \
1140 "Print detailed usage information on the code cache when exiting")\
1141 \
1142 product(bool, PrintCodeCacheOnCompilation, false, \
1143 "Print the code cache memory usage each time a method is " \
1144 "compiled") \
1145 \
1146 diagnostic(bool, PrintStubCode, false, \
1147 "Print generated stub code") \
1148 \
1149 product(bool, StackTraceInThrowable, true, \
1150 "Collect backtrace in throwable when exception happens") \
1151 \
1152 product(bool, OmitStackTraceInFastThrow, true, \
1153 "Omit backtraces for some 'hot' exceptions in optimized code") \
1154 \
1155 product(bool, ProfilerPrintByteCodeStatistics, false, \
1156 "Print bytecode statistics when dumping profiler output") \
1157 \
1158 product(bool, ProfilerRecordPC, false, \
1159 "Collect ticks for each 16 byte interval of compiled code") \
1160 \
1161 product(bool, ProfileVM, false, \
1162 "Profile ticks that fall within VM (either in the VM Thread " \
1163 "or VM code called through stubs)") \
1164 \
1165 product(bool, ProfileIntervals, false, \
1166 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1167 \
1168 notproduct(bool, ProfilerCheckIntervals, false, \
1169 "Collect and print information on spacing of profiler ticks") \
1170 \
1171 product(bool, PrintWarnings, true, \
1172 "Print JVM warnings to output stream") \
1173 \
1174 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1175 "Print warnings for stalled SpinLocks") \
1176 \
1177 product(bool, RegisterFinalizersAtInit, true, \
1178 "Register finalizable objects at end of Object.<init> or " \
1179 "after allocation") \
1180 \
1181 develop(bool, RegisterReferences, true, \
1182 "Tell whether the VM should register soft/weak/final/phantom " \
1183 "references") \
1184 \
1185 develop(bool, IgnoreRewrites, false, \
1186 "Suppress rewrites of bytecodes in the oopmap generator. " \
1187 "This is unsafe!") \
1188 \
1189 develop(bool, PrintCodeCacheExtension, false, \
1190 "Print extension of code cache") \
1191 \
1192 develop(bool, UsePrivilegedStack, true, \
1193 "Enable the security JVM functions") \
1194 \
1195 develop(bool, ProtectionDomainVerification, true, \
1196 "Verify protection domain before resolution in system dictionary")\
1197 \
1198 product(bool, ClassUnloading, true, \
1199 "Do unloading of classes") \
1200 \
1201 product(bool, ClassUnloadingWithConcurrentMark, true, \
1202 "Do unloading of classes with a concurrent marking cycle") \
1203 \
1204 develop(bool, DisableStartThread, false, \
1205 "Disable starting of additional Java threads " \
1206 "(for debugging only)") \
1207 \
1208 develop(bool, MemProfiling, false, \
1209 "Write memory usage profiling to log file") \
1210 \
1211 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1212 "Print the system dictionary at exit") \
1213 \
1214 experimental(intx, PredictedLoadedClassCount, 0, \
1215 "Experimental: Tune loaded class cache starting size") \
1216 \
1217 diagnostic(bool, UnsyncloadClass, false, \
1218 "Unstable: VM calls loadClass unsynchronized. Custom " \
1219 "class loader must call VM synchronized for findClass " \
1220 "and defineClass.") \
1221 \
1222 product(bool, AlwaysLockClassLoader, false, \
1223 "Require the VM to acquire the class loader lock before calling " \
1224 "loadClass() even for class loaders registering " \
1225 "as parallel capable") \
1226 \
1227 product(bool, AllowParallelDefineClass, false, \
1228 "Allow parallel defineClass requests for class loaders " \
1229 "registering as parallel capable") \
1230 \
1231 product(bool, MustCallLoadClassInternal, false, \
1232 "Call loadClassInternal() rather than loadClass()") \
1233 \
1234 product_pd(bool, DontYieldALot, \
1235 "Throw away obvious excess yield calls") \
1236 \
1237 product_pd(bool, ConvertSleepToYield, \
1238 "Convert sleep(0) to thread yield " \
1239 "(may be off for Solaris to improve GUI)") \
1240 \
1241 product(bool, ConvertYieldToSleep, false, \
1242 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1243 "behavior") \
1244 \
1245 develop(bool, UseDetachedThreads, true, \
1246 "Use detached threads that are recycled upon termination " \
1247 "(for Solaris only)") \
1248 \
1249 product(bool, UseLWPSynchronization, true, \
1250 "Use LWP-based instead of libthread-based synchronization " \
1251 "(SPARC only)") \
1252 \
1253 experimental(ccstr, SyncKnobs, NULL, \
1254 "(Unstable) Various monitor synchronization tunables") \
1255 \
1256 experimental(intx, EmitSync, 0, \
1257 "(Unsafe, Unstable) " \
1258 "Control emission of inline sync fast-path code") \
1259 \
1260 product(intx, MonitorBound, 0, "Bound Monitor population") \
1261 \
1262 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1263 \
1264 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1265 "Experimental Sync flags") \
1266 \
1267 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1268 \
1269 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1270 \
1271 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1272 \
1273 experimental(intx, hashCode, 5, \
1274 "(Unstable) select hashCode generation algorithm") \
1275 \
1276 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1277 "(Unstable, Linux-specific) " \
1278 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1279 \
1280 product(bool, FilterSpuriousWakeups, true, \
1281 "When true prevents OS-level spurious, or premature, wakeups " \
1282 "from Object.wait (Ignored for Windows)") \
1283 \
1284 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1285 \
1286 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1287 \
1288 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1289 \
1290 develop(bool, UsePthreads, false, \
1291 "Use pthread-based instead of libthread-based synchronization " \
1292 "(SPARC only)") \
1293 \
1294 product(bool, ReduceSignalUsage, false, \
1295 "Reduce the use of OS signals in Java and/or the VM") \
1296 \
1297 develop_pd(bool, ShareVtableStubs, \
1298 "Share vtable stubs (smaller code but worse branch prediction") \
1299 \
1300 develop(bool, LoadLineNumberTables, true, \
1301 "Tell whether the class file parser loads line number tables") \
1302 \
1303 develop(bool, LoadLocalVariableTables, true, \
1304 "Tell whether the class file parser loads local variable tables") \
1305 \
1306 develop(bool, LoadLocalVariableTypeTables, true, \
1307 "Tell whether the class file parser loads local variable type" \
1308 "tables") \
1309 \
1310 product(bool, AllowUserSignalHandlers, false, \
1311 "Do not complain if the application installs signal handlers " \
1312 "(Solaris & Linux only)") \
1313 \
1314 product(bool, UseSignalChaining, true, \
1315 "Use signal-chaining to invoke signal handlers installed " \
1316 "by the application (Solaris & Linux only)") \
1317 \
1318 product(bool, UseAltSigs, false, \
1319 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1320 "internal signals (Solaris only)") \
1321 \
1322 product(bool, AllowJNIEnvProxy, false, \
1323 "Allow JNIEnv proxies for jdbx") \
1324 \
1325 product(bool, JNIDetachReleasesMonitors, true, \
1326 "JNI DetachCurrentThread releases monitors owned by thread") \
1327 \
1328 product(bool, RestoreMXCSROnJNICalls, false, \
1329 "Restore MXCSR when returning from JNI calls") \
1330 \
1331 product(bool, CheckJNICalls, false, \
1332 "Verify all arguments to JNI calls") \
1333 \
1334 product(bool, CheckEndorsedAndExtDirs, false, \
1335 "Verify the endorsed and extension directories are not used") \
1336 \
1337 product(bool, UseFastJNIAccessors, true, \
1338 "Use optimized versions of Get<Primitive>Field") \
1339 \
1340 product(intx, MaxJNILocalCapacity, 65536, \
1341 "Maximum allowable local JNI handle capacity to " \
1342 "EnsureLocalCapacity() and PushLocalFrame(), " \
1343 "where <= 0 is unlimited, default: 65536") \
1344 \
1345 product(bool, EagerXrunInit, false, \
1346 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1347 "but not all -Xrun libraries may support the state of the VM " \
1348 "at this time") \
1349 \
1350 product(bool, PreserveAllAnnotations, false, \
1351 "Preserve RuntimeInvisibleAnnotations as well " \
1352 "as RuntimeVisibleAnnotations") \
1353 \
1354 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1355 "Number of OutOfMemoryErrors preallocated with backtrace") \
1356 \
1357 product(bool, UseXMMForArrayCopy, false, \
1358 "Use SSE2 MOVQ instruction for Arraycopy") \
1359 \
1360 product(intx, FieldsAllocationStyle, 1, \
1361 "0 - type based with oops first, " \
1362 "1 - with oops last, " \
1363 "2 - oops in super and sub classes are together") \
1364 range(0, 2) \
1365 \
1366 product(bool, CompactFields, true, \
1367 "Allocate nonstatic fields in gaps between previous fields") \
1368 \
1369 notproduct(bool, PrintFieldLayout, false, \
1370 "Print field layout for each class") \
1371 \
1372 /* Need to limit the extent of the padding to reasonable size. */\
1373 /* 8K is well beyond the reasonable HW cache line size, even with */\
1374 /* aggressive prefetching, while still leaving the room for segregating */\
1375 /* among the distinct pages. */\
1376 product(intx, ContendedPaddingWidth, 128, \
1377 "How many bytes to pad the fields/classes marked @Contended with")\
1378 range(0, 8192) \
1379 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \
1380 \
1381 product(bool, EnableContended, true, \
1382 "Enable @Contended annotation support") \
1383 \
1384 product(bool, RestrictContended, true, \
1385 "Restrict @Contended to trusted classes") \
1386 \
1387 product(bool, UseBiasedLocking, true, \
1388 "Enable biased locking in JVM") \
1389 \
1390 product(intx, BiasedLockingStartupDelay, 4000, \
1391 "Number of milliseconds to wait before enabling biased locking") \
1392 \
1393 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1394 "Print statistics of biased locking in JVM") \
1395 \
1396 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1397 "Threshold of number of revocations per type to try to " \
1398 "rebias all objects in the heap of that type") \
1399 \
1400 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1401 "Threshold of number of revocations per type to permanently " \
1402 "revoke biases of all objects in the heap of that type") \
1403 \
1404 product(intx, BiasedLockingDecayTime, 25000, \
1405 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1406 "type after previous bulk rebias") \
1407 \
1408 /* tracing */ \
1409 \
1410 notproduct(bool, TraceRuntimeCalls, false, \
1411 "Trace run-time calls") \
1412 \
1413 develop(bool, TraceJNICalls, false, \
1414 "Trace JNI calls") \
1415 \
1416 develop(bool, StressRewriter, false, \
1417 "Stress linktime bytecode rewriting") \
1418 \
1419 notproduct(bool, TraceJVMCalls, false, \
1420 "Trace JVM calls") \
1421 \
1422 product(ccstr, TraceJVMTI, NULL, \
1423 "Trace flags for JVMTI functions and events") \
1424 \
1425 /* This option can change an EMCP method into an obsolete method. */ \
1426 /* This can affect tests that except specific methods to be EMCP. */ \
1427 /* This option should be used with caution. */ \
1428 product(bool, StressLdcRewrite, false, \
1429 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1430 \
1431 product(intx, TraceRedefineClasses, 0, \
1432 "Trace level for JVMTI RedefineClasses") \
1433 \
1434 /* change to false by default sometime after Mustang */ \
1435 product(bool, VerifyMergedCPBytecodes, true, \
1436 "Verify bytecodes after RedefineClasses constant pool merging") \
1437 \
1438 develop(bool, TraceJNIHandleAllocation, false, \
1439 "Trace allocation/deallocation of JNI handle blocks") \
1440 \
1441 develop(bool, TraceBytecodes, false, \
1442 "Trace bytecode execution") \
1443 \
1444 develop(bool, TraceClassInitialization, false, \
1445 "Trace class initialization") \
1446 \
1447 product(bool, TraceExceptions, false, \
1448 "Trace exceptions") \
1449 \
1450 develop(bool, TraceICs, false, \
1451 "Trace inline cache changes") \
1452 \
1453 notproduct(bool, TraceInvocationCounterOverflow, false, \
1454 "Trace method invocation counter overflow") \
1455 \
1456 develop(bool, TraceInlineCacheClearing, false, \
1457 "Trace clearing of inline caches in nmethods") \
1458 \
1459 develop(bool, TraceDependencies, false, \
1460 "Trace dependencies") \
1461 \
1462 develop(bool, VerifyDependencies, trueInDebug, \
1463 "Exercise and verify the compilation dependency mechanism") \
1464 \
1465 develop(bool, TraceNewOopMapGeneration, false, \
1466 "Trace OopMapGeneration") \
1467 \
1468 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1469 "Trace OopMapGeneration: print detailed cell states") \
1470 \
1471 develop(bool, TimeOopMap, false, \
1472 "Time calls to GenerateOopMap::compute_map() in sum") \
1473 \
1474 develop(bool, TimeOopMap2, false, \
1475 "Time calls to GenerateOopMap::compute_map() individually") \
1476 \
1477 develop(bool, TraceMonitorMismatch, false, \
1478 "Trace monitor matching failures during OopMapGeneration") \
1479 \
1480 develop(bool, TraceOopMapRewrites, false, \
1481 "Trace rewriting of method oops during oop map generation") \
1482 \
1483 develop(bool, TraceSafepoint, false, \
1484 "Trace safepoint operations") \
1485 \
1486 develop(bool, TraceICBuffer, false, \
1487 "Trace usage of IC buffer") \
1488 \
1489 develop(bool, TraceCompiledIC, false, \
1490 "Trace changes of compiled IC") \
1491 \
1492 notproduct(bool, TraceZapDeadLocals, false, \
1493 "Trace zapping dead locals") \
1494 \
1495 develop(bool, TraceStartupTime, false, \
1496 "Trace setup time") \
1497 \
1498 develop(bool, TraceProtectionDomainVerification, false, \
1499 "Trace protection domain verification") \
1500 \
1501 develop(bool, TraceClearedExceptions, false, \
1502 "Print when an exception is forcibly cleared") \
1503 \
1504 product(bool, TraceClassResolution, false, \
1505 "Trace all constant pool resolutions (for debugging)") \
1506 \
1507 product(bool, TraceBiasedLocking, false, \
1508 "Trace biased locking in JVM") \
1509 \
1510 product(bool, TraceMonitorInflation, false, \
1511 "Trace monitor inflation in JVM") \
1512 \
1513 /* gc */ \
1514 \
1515 product(bool, UseSerialGC, false, \
1516 "Use the Serial garbage collector") \
1517 \
1518 product(bool, UseG1GC, false, \
1519 "Use the Garbage-First garbage collector") \
1520 \
1521 product(bool, UseShenandoahGC, false, \
1522 "Use the Shenandoah garbage collector") \
1523 \
1524 product(uintx, ShenandoahHeapRegionSize, 0, \
1525 "Size of the Shenandoah regions.") \
1526 \
1527 develop(bool, ShenandoahDumpHeapBeforeConcurrentMark, false, \
1528 "Dump the ShenanodahHeap Before Each ConcurrentMark") \
1529 \
1530 develop(bool, ShenandoahDumpHeapAfterConcurrentMark, false, \
1531 "Dump the ShenanodahHeap After Each Concurrent Mark") \
1532 \
1533 product(bool, ShenandoahTraceFullGC, false, \
1534 "Trace Shenandoah full GC") \
1535 \
1536 product(bool, ShenandoahTracePhases, false, \
1537 "Trace Shenandoah GC phases") \
1538 \
1539 develop(bool, ShenandoahTraceJNICritical, false, \
1540 "Trace Shenandoah stalls for JNI critical regions") \
1541 \
1542 product(bool, ShenandoahTraceHumongous, false, \
1543 "Trace Shenandoah humongous objects") \
1544 \
1545 develop(bool, ShenandoahTraceAllocations, false, \
1546 "Trace Shenandoah Allocations") \
1547 \
1548 develop(bool, ShenandoahTraceBrooksPointers, false, \
1549 "Trace Brooks Pointer updates") \
1550 \
1551 develop(bool, ShenandoahTraceEvacuations, false, \
1552 "Trace Shenandoah Evacuations") \
1553 \
1554 develop(bool, ShenandoahVerifyWritesToFromSpace, false, \
1555 "Use Memory Protection to signal illegal writes to from space") \
1556 \
1557 develop(bool, ShenandoahVerifyReadsToFromSpace, false, \
1558 "Use Memory Protection to signal illegal reads to from space") \
1559 \
1560 develop(bool, ShenandoahTraceConcurrentMarking, false, \
1561 "Trace Concurrent Marking") \
1562 \
1563 develop(bool, ShenandoahTraceUpdates, false, \
1564 "Trace Shenandoah Updates") \
1565 \
1566 develop(bool, ShenandoahTraceTLabs, false, \
1567 "Trace TLabs in Shenandoah Heap") \
1568 \
1569 product(bool, ShenandoahProcessReferences, true, \
1570 "Enable processing of (soft/weak/..) references in Shenandoah") \
1571 \
1572 develop(bool, ShenandoahTraceWeakReferences, false, \
1573 "Trace Weak Reference Processing in Shenandoah Heap") \
1574 \
1575 product(bool, ShenandoahGCVerbose, false, \
1576 "Verbose information about the Shenandoah garbage collector") \
1577 \
1578 product(bool, ShenandoahLogConfig, false, \
1579 "Log information about Shenandoah's configuration settings") \
1580 \
1581 develop(bool, ShenandoahVerify, false, \
1582 "Verify the Shenandoah garbage collector") \
1583 \
1584 product(bool, ShenandoahParallelRootScan, true, \
1585 "Turn on/off parallel root scanning in Shenandoah") \
1586 \
1587 product(bool, ShenandoahConcurrentEvacuation, true, \
1588 "Turn on/off concurrent evacuation in Shenandoah") \
1589 \
1590 product(bool, ShenandoahConcurrentMarking, true, \
1591 "Turn on/off concurrent marking in Shenandoah") \
1592 \
1593 product(bool, ShenandoahUpdateRefsEarly,false, \
1594 "Turn on/off early updating of references in Shenandoah") \
1595 \
1596 product(bool, ShenandoahConcurrentUpdateRefs, true, \
1597 "Turn on/off concurrent reference updating in Shenandoah") \
1598 \
1599 product(bool, ShenandoahWriteBarrier, true, \
1600 "Turn on/off write barriers in Shenandoah") \
1601 \
1602 product(bool, ShenandoahReadBarrier, true, \
1603 "Turn on/off read barriers in Shenandoah") \
1604 \
1605 product(ccstr, ShenandoahGCHeuristics, "dynamic", \
1606 "The heuristics to use in Shenandoah GC; possible values: " \
1607 "statusquo, aggressive, halfway, lazy, dynamic") \
1608 \
1609 product(uintx, ShenandoahGarbageThreshold, 60, \
1610 "Sets the percentage of garbage a region need to contain before " \
1611 "it can be marked for collection. Applies to " \
1612 "Shenandoah GC dynamic Heuristic mode only (ignored otherwise)") \
1613 \
1614 product(uintx, ShenandoahFreeThreshold, 25, \
1615 "Set the percentage of heap free in relation to the total " \
1616 "capacity before a region can enter the concurrent marking " \
1617 "phase. Applies to Shenandoah GC dynamic Heuristic mode only " \
1618 "(ignored otherwise)") \
1619 \
1620 product(uintx, ShenandoahInitialFreeThreshold, 50, \
1621 "Set the percentage of heap free in relation to the total " \
1622 "capacity before a region can enter the concurrent marking " \
1623 "phase. Applies to Shenandoah GC dynamic Heuristic mode only " \
1624 "(ignored otherwise)") \
1625 \
1626 product(uintx, ShenandoahAllocationThreshold, 0, \
1627 "Set the number of bytes allocated since last GC cycle before" \
1628 "a region can enter the concurrent marking " \
1629 "phase. Applies to Shenandoah GC dynamic Heuristic mode only " \
1630 "(ignored otherwise)") \
1631 \
1632 product(uintx, ShenandoahTargetHeapOccupancy, 80, \
1633 "Sets the target maximum percentage occupance of the heap we" \
1634 "would like to maintain." \
1635 "Shenandoah GC newadaptive Heuristic mode only.") \
1636 \
1637 product(bool, ShenandoahPrintCollectionSet, false, \
1638 "Print the collection set before each GC phase") \
1639 \
1640 product(bool, UseParallelGC, false, \
1641 "Use the Parallel Scavenge garbage collector") \
1642 \
1643 product(bool, UseParallelOldGC, false, \
1644 "Use the Parallel Old garbage collector") \
1645 \
1646 product(uintx, HeapMaximumCompactionInterval, 20, \
1647 "How often should we maximally compact the heap (not allowing " \
1648 "any dead space)") \
1649 \
1650 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1651 "The collection count for the first maximum compaction") \
1652 \
1653 product(bool, UseMaximumCompactionOnSystemGC, true, \
1654 "Use maximum compaction in the Parallel Old garbage collector " \
1655 "for a system GC") \
1656 \
1657 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1658 "The mean used by the parallel compact dead wood " \
1659 "limiter (a number between 0-100)") \
1660 range(0, 100) \
1661 \
1662 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1663 "The standard deviation used by the parallel compact dead wood " \
1664 "limiter (a number between 0-100)") \
1665 range(0, 100) \
1666 \
1667 product(uint, ParallelGCThreads, 0, \
1668 "Number of parallel threads parallel gc will use") \
1669 \
1670 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1671 "Use semaphore synchronization for the GC Threads, " \
1672 "instead of synchronization based on mutexes") \
1673 \
1674 product(bool, UseDynamicNumberOfGCThreads, false, \
1675 "Dynamically choose the number of parallel threads " \
1676 "parallel gc will use") \
1677 \
1678 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1679 "Force dynamic selection of the number of " \
1680 "parallel threads parallel gc will use to aid debugging") \
1681 \
1682 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1683 "Size of heap (bytes) per GC thread used in calculating the " \
1684 "number of GC threads") \
1685 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1686 \
1687 product(bool, TraceDynamicGCThreads, false, \
1688 "Trace the dynamic GC thread usage") \
1689 \
1690 develop(bool, ParallelOldGCSplitALot, false, \
1691 "Provoke splitting (copying data from a young gen space to " \
1692 "multiple destination spaces)") \
1693 \
1694 develop(uintx, ParallelOldGCSplitInterval, 3, \
1695 "How often to provoke splitting a young gen space") \
1696 range(0, max_uintx) \
1697 \
1698 product(uint, ConcGCThreads, 0, \
1699 "Number of threads concurrent gc will use") \
1700 \
1701 product(size_t, YoungPLABSize, 4096, \
1702 "Size of young gen promotion LAB's (in HeapWords)") \
1703 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
1704 \
1705 product(size_t, OldPLABSize, 1024, \
1706 "Size of old gen promotion LAB's (in HeapWords), or Number \
1707 of blocks to attempt to claim when refilling CMS LAB's") \
1708 \
1709 product(uintx, GCTaskTimeStampEntries, 200, \
1710 "Number of time stamp entries per gc worker thread") \
1711 range(1, max_uintx) \
1712 \
1713 product(bool, AlwaysTenure, false, \
1714 "Always tenure objects in eden (ParallelGC only)") \
1715 \
1716 product(bool, NeverTenure, false, \
1717 "Never tenure objects in eden, may tenure on overflow " \
1718 "(ParallelGC only)") \
1719 \
1720 product(bool, ScavengeBeforeFullGC, true, \
1721 "Scavenge young generation before each full GC.") \
1722 \
1723 develop(bool, ScavengeWithObjectsInToSpace, false, \
1724 "Allow scavenges to occur when to-space contains objects") \
1725 \
1726 product(bool, UseConcMarkSweepGC, false, \
1727 "Use Concurrent Mark-Sweep GC in the old generation") \
1728 \
1729 product(bool, ExplicitGCInvokesConcurrent, false, \
1730 "A System.gc() request invokes a concurrent collection; " \
1731 "(effective only when using concurrent collectors)") \
1732 \
1733 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1734 "A System.gc() request invokes a concurrent collection and " \
1735 "also unloads classes during such a concurrent gc cycle " \
1736 "(effective only when UseConcMarkSweepGC)") \
1737 \
1738 product(bool, GCLockerInvokesConcurrent, false, \
1739 "The exit of a JNI critical section necessitating a scavenge, " \
1740 "also kicks off a background concurrent collection") \
1741 \
1742 product(uintx, GCLockerEdenExpansionPercent, 5, \
1743 "How much the GC can expand the eden by while the GC locker " \
1744 "is active (as a percentage)") \
1745 range(0, 100) \
1746 \
1747 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1748 "Number of times to retry allocations when " \
1749 "blocked by the GC locker") \
1750 \
1751 develop(bool, UseCMSAdaptiveFreeLists, true, \
1752 "Use adaptive free lists in the CMS generation") \
1753 \
1754 develop(bool, UseAsyncConcMarkSweepGC, true, \
1755 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1756 \
1757 product(bool, UseCMSBestFit, true, \
1758 "Use CMS best fit allocation strategy") \
1759 \
1760 product(bool, UseParNewGC, false, \
1761 "Use parallel threads in the new generation") \
1762 \
1763 product(bool, PrintTaskqueue, false, \
1764 "Print taskqueue statistics for parallel collectors") \
1765 \
1766 product(bool, PrintTerminationStats, false, \
1767 "Print termination statistics for parallel collectors") \
1768 \
1769 product(uintx, ParallelGCBufferWastePct, 10, \
1770 "Wasted fraction of parallel allocation buffer") \
1771 range(0, 100) \
1772 \
1773 product(uintx, TargetPLABWastePct, 10, \
1774 "Target wasted space in last buffer as percent of overall " \
1775 "allocation") \
1776 range(1, 100) \
1777 \
1778 product(uintx, PLABWeight, 75, \
1779 "Percentage (0-100) used to weight the current sample when " \
1780 "computing exponentially decaying average for ResizePLAB") \
1781 range(0, 100) \
1782 \
1783 product(bool, ResizePLAB, true, \
1784 "Dynamically resize (survivor space) promotion LAB's") \
1785 \
1786 product(bool, PrintPLAB, false, \
1787 "Print (survivor space) promotion LAB's sizing decisions") \
1788 \
1789 product(intx, ParGCArrayScanChunk, 50, \
1790 "Scan a subset of object array and push remainder, if array is " \
1791 "bigger than this") \
1792 range(1, max_intx) \
1793 \
1794 product(bool, ParGCUseLocalOverflow, false, \
1795 "Instead of a global overflow list, use local overflow stacks") \
1796 \
1797 product(bool, ParGCTrimOverflow, true, \
1798 "Eagerly trim the local overflow lists " \
1799 "(when ParGCUseLocalOverflow)") \
1800 \
1801 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1802 "Simulate work queue overflow in ParNew") \
1803 \
1804 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1805 "An `interval' counter that determines how frequently " \
1806 "we simulate overflow; a smaller number increases frequency") \
1807 \
1808 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1809 "The desired number of objects to claim from the overflow list") \
1810 \
1811 diagnostic(uintx, ParGCStridesPerThread, 2, \
1812 "The number of strides per worker thread that we divide up the " \
1813 "card table scanning work into") \
1814 range(1, max_uintx) \
1815 \
1816 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1817 "The number of cards in each chunk of the parallel chunks used " \
1818 "during card table scanning") \
1819 range(1, max_intx) \
1820 \
1821 product(uintx, OldPLABWeight, 50, \
1822 "Percentage (0-100) used to weight the current sample when " \
1823 "computing exponentially decaying average for resizing " \
1824 "OldPLABSize") \
1825 range(0, 100) \
1826 \
1827 product(bool, ResizeOldPLAB, true, \
1828 "Dynamically resize (old gen) promotion LAB's") \
1829 \
1830 product(bool, PrintOldPLAB, false, \
1831 "Print (old gen) promotion LAB's sizing decisions") \
1832 \
1833 product(size_t, CMSOldPLABMax, 1024, \
1834 "Maximum size of CMS gen promotion LAB caches per worker " \
1835 "per block size") \
1836 range(1, max_uintx) \
1837 \
1838 product(size_t, CMSOldPLABMin, 16, \
1839 "Minimum size of CMS gen promotion LAB caches per worker " \
1840 "per block size") \
1841 range(1, max_uintx) \
1842 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \
1843 \
1844 product(uintx, CMSOldPLABNumRefills, 4, \
1845 "Nominal number of refills of CMS gen promotion LAB cache " \
1846 "per worker per block size") \
1847 range(1, max_uintx) \
1848 \
1849 product(bool, CMSOldPLABResizeQuicker, false, \
1850 "React on-the-fly during a scavenge to a sudden " \
1851 "change in block demand rate") \
1852 \
1853 product(uintx, CMSOldPLABToleranceFactor, 4, \
1854 "The tolerance of the phase-change detector for on-the-fly " \
1855 "PLAB resizing during a scavenge") \
1856 range(1, max_uintx) \
1857 \
1858 product(uintx, CMSOldPLABReactivityFactor, 2, \
1859 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1860 "during a scavenge") \
1861 \
1862 product(bool, AlwaysPreTouch, false, \
1863 "Force all freshly committed pages to be pre-touched") \
1864 \
1865 product_pd(size_t, CMSYoungGenPerWorker, \
1866 "The maximum size of young gen chosen by default per GC worker " \
1867 "thread available") \
1868 range(1, max_uintx) \
1869 \
1870 product(uintx, CMSIncrementalSafetyFactor, 10, \
1871 "Percentage (0-100) used to add conservatism when computing the " \
1872 "duty cycle") \
1873 range(0, 100) \
1874 \
1875 product(uintx, CMSExpAvgFactor, 50, \
1876 "Percentage (0-100) used to weight the current sample when " \
1877 "computing exponential averages for CMS statistics") \
1878 range(0, 100) \
1879 \
1880 product(uintx, CMS_FLSWeight, 75, \
1881 "Percentage (0-100) used to weight the current sample when " \
1882 "computing exponentially decaying averages for CMS FLS " \
1883 "statistics") \
1884 range(0, 100) \
1885 \
1886 product(uintx, CMS_FLSPadding, 1, \
1887 "The multiple of deviation from mean to use for buffering " \
1888 "against volatility in free list demand") \
1889 \
1890 product(uintx, FLSCoalescePolicy, 2, \
1891 "CMS: aggressiveness level for coalescing, increasing " \
1892 "from 0 to 4") \
1893 range(0, 4) \
1894 \
1895 product(bool, FLSAlwaysCoalesceLarge, false, \
1896 "CMS: larger free blocks are always available for coalescing") \
1897 \
1898 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1899 "CMS: the smaller the percentage the greater the coalescing " \
1900 "force") \
1901 \
1902 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1903 "CMS: the factor by which to inflate estimated demand of small " \
1904 "block sizes to prevent coalescing with an adjoining block") \
1905 \
1906 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1907 "CMS: the factor by which to inflate estimated demand of large " \
1908 "block sizes to prevent coalescing with an adjoining block") \
1909 \
1910 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1911 "CMS: the factor by which to inflate estimated demand of small " \
1912 "block sizes to prevent splitting to supply demand for smaller " \
1913 "blocks") \
1914 \
1915 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1916 "CMS: the factor by which to inflate estimated demand of large " \
1917 "block sizes to prevent splitting to supply demand for smaller " \
1918 "blocks") \
1919 \
1920 product(bool, CMSExtrapolateSweep, false, \
1921 "CMS: cushion for block demand during sweep") \
1922 \
1923 product(uintx, CMS_SweepWeight, 75, \
1924 "Percentage (0-100) used to weight the current sample when " \
1925 "computing exponentially decaying average for inter-sweep " \
1926 "duration") \
1927 range(0, 100) \
1928 \
1929 product(uintx, CMS_SweepPadding, 1, \
1930 "The multiple of deviation from mean to use for buffering " \
1931 "against volatility in inter-sweep duration") \
1932 \
1933 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1934 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1935 "duration exceeds this threshold in milliseconds") \
1936 \
1937 product(bool, CMSClassUnloadingEnabled, true, \
1938 "Whether class unloading enabled when using CMS GC") \
1939 \
1940 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1941 "When CMS class unloading is enabled, the maximum CMS cycle " \
1942 "count for which classes may not be unloaded") \
1943 \
1944 develop(intx, CMSDictionaryChoice, 0, \
1945 "Use BinaryTreeDictionary as default in the CMS generation") \
1946 \
1947 product(uintx, CMSIndexedFreeListReplenish, 4, \
1948 "Replenish an indexed free list with this number of chunks") \
1949 \
1950 product(bool, CMSReplenishIntermediate, true, \
1951 "Replenish all intermediate free-list caches") \
1952 \
1953 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1954 "When satisfying batched demand, split blocks from the " \
1955 "IndexedFreeList whose size is a multiple of requested size") \
1956 \
1957 product(bool, CMSLoopWarn, false, \
1958 "Warn in case of excessive CMS looping") \
1959 \
1960 develop(bool, CMSOverflowEarlyRestoration, false, \
1961 "Restore preserved marks early") \
1962 \
1963 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1964 "Size of marking stack") \
1965 \
1966 /* where does the range max value of (max_jint - 1) come from? */ \
1967 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1968 "Maximum size of marking stack") \
1969 range(1, (max_jint - 1)) \
1970 \
1971 notproduct(bool, CMSMarkStackOverflowALot, false, \
1972 "Simulate frequent marking stack / work queue overflow") \
1973 \
1974 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1975 "An \"interval\" counter that determines how frequently " \
1976 "to simulate overflow; a smaller number increases frequency") \
1977 \
1978 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1979 "Maximum number of abortable preclean iterations, if > 0") \
1980 \
1981 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1982 "Maximum time in abortable preclean (in milliseconds)") \
1983 \
1984 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1985 "Nominal minimum work per abortable preclean iteration") \
1986 \
1987 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1988 "Time that we sleep between iterations when not given " \
1989 "enough work per iteration") \
1990 \
1991 product(size_t, CMSRescanMultiple, 32, \
1992 "Size (in cards) of CMS parallel rescan task") \
1993 range(1, max_uintx) \
1994 \
1995 product(size_t, CMSConcMarkMultiple, 32, \
1996 "Size (in cards) of CMS concurrent MT marking task") \
1997 range(1, max_uintx) \
1998 \
1999 product(bool, CMSAbortSemantics, false, \
2000 "Whether abort-on-overflow semantics is implemented") \
2001 \
2002 product(bool, CMSParallelInitialMarkEnabled, true, \
2003 "Use the parallel initial mark.") \
2004 \
2005 product(bool, CMSParallelRemarkEnabled, true, \
2006 "Whether parallel remark enabled (only if ParNewGC)") \
2007 \
2008 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
2009 "Whether parallel remark of survivor space " \
2010 "enabled (effective only if CMSParallelRemarkEnabled)") \
2011 \
2012 product(bool, CMSPLABRecordAlways, true, \
2013 "Always record survivor space PLAB boundaries (effective only " \
2014 "if CMSParallelSurvivorRemarkEnabled)") \
2015 \
2016 product(bool, CMSEdenChunksRecordAlways, true, \
2017 "Always record eden chunks used for the parallel initial mark " \
2018 "or remark of eden") \
2019 \
2020 product(bool, CMSPrintEdenSurvivorChunks, false, \
2021 "Print the eden and the survivor chunks used for the parallel " \
2022 "initial mark or remark of the eden/survivor spaces") \
2023 \
2024 product(bool, CMSConcurrentMTEnabled, true, \
2025 "Whether multi-threaded concurrent work enabled " \
2026 "(effective only if ParNewGC)") \
2027 \
2028 product(bool, CMSPrecleaningEnabled, true, \
2029 "Whether concurrent precleaning enabled") \
2030 \
2031 product(uintx, CMSPrecleanIter, 3, \
2032 "Maximum number of precleaning iteration passes") \
2033 range(0, 9) \
2034 \
2035 product(uintx, CMSPrecleanDenominator, 3, \
2036 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
2037 "ratio") \
2038 range(1, max_uintx) \
2039 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
2040 \
2041 product(uintx, CMSPrecleanNumerator, 2, \
2042 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
2043 "ratio") \
2044 range(0, max_uintx-1) \
2045 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
2046 \
2047 product(bool, CMSPrecleanRefLists1, true, \
2048 "Preclean ref lists during (initial) preclean phase") \
2049 \
2050 product(bool, CMSPrecleanRefLists2, false, \
2051 "Preclean ref lists during abortable preclean phase") \
2052 \
2053 product(bool, CMSPrecleanSurvivors1, false, \
2054 "Preclean survivors during (initial) preclean phase") \
2055 \
2056 product(bool, CMSPrecleanSurvivors2, true, \
2057 "Preclean survivors during abortable preclean phase") \
2058 \
2059 product(uintx, CMSPrecleanThreshold, 1000, \
2060 "Do not iterate again if number of dirty cards is less than this")\
2061 range(100, max_uintx) \
2062 \
2063 product(bool, CMSCleanOnEnter, true, \
2064 "Clean-on-enter optimization for reducing number of dirty cards") \
2065 \
2066 product(uintx, CMSRemarkVerifyVariant, 1, \
2067 "Choose variant (1,2) of verification following remark") \
2068 range(1, 2) \
2069 \
2070 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
2071 "If Eden size is below this, do not try to schedule remark") \
2072 \
2073 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
2074 "The Eden occupancy percentage (0-100) at which " \
2075 "to try and schedule remark pause") \
2076 range(0, 100) \
2077 \
2078 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
2079 "Start sampling eden top at least before young gen " \
2080 "occupancy reaches 1/<ratio> of the size at which " \
2081 "we plan to schedule remark") \
2082 range(1, max_uintx) \
2083 \
2084 product(uintx, CMSSamplingGrain, 16*K, \
2085 "The minimum distance between eden samples for CMS (see above)") \
2086 range(1, max_uintx) \
2087 \
2088 product(bool, CMSScavengeBeforeRemark, false, \
2089 "Attempt scavenge before the CMS remark step") \
2090 \
2091 develop(bool, CMSTraceSweeper, false, \
2092 "Trace some actions of the CMS sweeper") \
2093 \
2094 product(uintx, CMSWorkQueueDrainThreshold, 10, \
2095 "Don't drain below this size per parallel worker/thief") \
2096 \
2097 manageable(intx, CMSWaitDuration, 2000, \
2098 "Time in milliseconds that CMS thread waits for young GC") \
2099 \
2100 develop(uintx, CMSCheckInterval, 1000, \
2101 "Interval in milliseconds that CMS thread checks if it " \
2102 "should start a collection cycle") \
2103 \
2104 product(bool, CMSYield, true, \
2105 "Yield between steps of CMS") \
2106 \
2107 product(size_t, CMSBitMapYieldQuantum, 10*M, \
2108 "Bitmap operations should process at most this many bits " \
2109 "between yields") \
2110 range(1, max_uintx) \
2111 \
2112 product(bool, CMSDumpAtPromotionFailure, false, \
2113 "Dump useful information about the state of the CMS old " \
2114 "generation upon a promotion failure") \
2115 \
2116 product(bool, CMSPrintChunksInDump, false, \
2117 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2118 "more detailed information about the free chunks") \
2119 \
2120 product(bool, CMSPrintObjectsInDump, false, \
2121 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2122 "more detailed information about the allocated objects") \
2123 \
2124 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
2125 "Verify that all references across the FLS boundary " \
2126 "are to valid objects") \
2127 \
2128 diagnostic(bool, FLSVerifyLists, false, \
2129 "Do lots of (expensive) FreeListSpace verification") \
2130 \
2131 diagnostic(bool, FLSVerifyIndexTable, false, \
2132 "Do lots of (expensive) FLS index table verification") \
2133 \
2134 develop(bool, FLSVerifyDictionary, false, \
2135 "Do lots of (expensive) FLS dictionary verification") \
2136 \
2137 develop(bool, VerifyBlockOffsetArray, false, \
2138 "Do (expensive) block offset array verification") \
2139 \
2140 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2141 "Maintain _unallocated_block in BlockOffsetArray " \
2142 "(currently applicable only to CMS collector)") \
2143 \
2144 develop(bool, TraceCMSState, false, \
2145 "Trace the state of the CMS collection") \
2146 \
2147 product(intx, RefDiscoveryPolicy, 0, \
2148 "Select type of reference discovery policy: " \
2149 "reference-based(0) or referent-based(1)") \
2150 range(ReferenceProcessor::DiscoveryPolicyMin, \
2151 ReferenceProcessor::DiscoveryPolicyMax) \
2152 \
2153 product(bool, ParallelRefProcEnabled, false, \
2154 "Enable parallel reference processing whenever possible") \
2155 \
2156 product(bool, ParallelRefProcBalancingEnabled, true, \
2157 "Enable balancing of reference processing queues") \
2158 \
2159 product(uintx, CMSTriggerRatio, 80, \
2160 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2161 "allocated before a CMS collection cycle commences") \
2162 range(0, 100) \
2163 \
2164 product(uintx, CMSBootstrapOccupancy, 50, \
2165 "Percentage CMS generation occupancy at which to " \
2166 "initiate CMS collection for bootstrapping collection stats") \
2167 range(0, 100) \
2168 \
2169 product(intx, CMSInitiatingOccupancyFraction, -1, \
2170 "Percentage CMS generation occupancy to start a CMS collection " \
2171 "cycle. A negative value means that CMSTriggerRatio is used") \
2172 range(min_intx, 100) \
2173 \
2174 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2175 "Percentage of the (entire) heap occupancy to start a " \
2176 "concurrent GC cycle. It is used by GCs that trigger a " \
2177 "concurrent GC cycle based on the occupancy of the entire heap, " \
2178 "not just one of the generations (e.g., G1). A value of 0 " \
2179 "denotes 'do constant GC cycles'.") \
2180 range(0, 100) \
2181 \
2182 manageable(intx, CMSTriggerInterval, -1, \
2183 "Commence a CMS collection cycle (at least) every so many " \
2184 "milliseconds (0 permanently, -1 disabled)") \
2185 range(-1, max_intx) \
2186 \
2187 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2188 "Only use occupancy as a criterion for starting a CMS collection")\
2189 \
2190 product(uintx, CMSIsTooFullPercentage, 98, \
2191 "An absolute ceiling above which CMS will always consider the " \
2192 "unloading of classes when class unloading is enabled") \
2193 range(0, 100) \
2194 \
2195 develop(bool, CMSTestInFreeList, false, \
2196 "Check if the coalesced range is already in the " \
2197 "free lists as claimed") \
2198 \
2199 notproduct(bool, CMSVerifyReturnedBytes, false, \
2200 "Check that all the garbage collected was returned to the " \
2201 "free lists") \
2202 \
2203 notproduct(bool, ScavengeALot, false, \
2204 "Force scavenge at every Nth exit from the runtime system " \
2205 "(N=ScavengeALotInterval)") \
2206 \
2207 develop(bool, FullGCALot, false, \
2208 "Force full gc at every Nth exit from the runtime system " \
2209 "(N=FullGCALotInterval)") \
2210 \
2211 notproduct(bool, GCALotAtAllSafepoints, false, \
2212 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2213 \
2214 product(bool, PrintPromotionFailure, false, \
2215 "Print additional diagnostic information following " \
2216 "promotion failure") \
2217 \
2218 notproduct(bool, PromotionFailureALot, false, \
2219 "Use promotion failure handling on every young generation " \
2220 "collection") \
2221 \
2222 develop(uintx, PromotionFailureALotCount, 1000, \
2223 "Number of promotion failures occurring at PLAB " \
2224 "refill attempts (ParNew) or promotion attempts " \
2225 "(other young collectors)") \
2226 \
2227 develop(uintx, PromotionFailureALotInterval, 5, \
2228 "Total collections between promotion failures a lot") \
2229 \
2230 experimental(uintx, WorkStealingSleepMillis, 1, \
2231 "Sleep time when sleep is used for yields") \
2232 \
2233 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2234 "Number of yields before a sleep is done during work stealing") \
2235 \
2236 experimental(uintx, WorkStealingHardSpins, 4096, \
2237 "Number of iterations in a spin loop between checks on " \
2238 "time out of hard spin") \
2239 \
2240 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2241 "Ratio of hard spins to calls to yield") \
2242 \
2243 develop(uintx, ObjArrayMarkingStride, 512, \
2244 "Number of object array elements to push onto the marking stack " \
2245 "before pushing a continuation entry") \
2246 \
2247 develop(bool, MetadataAllocationFailALot, false, \
2248 "Fail metadata allocations at intervals controlled by " \
2249 "MetadataAllocationFailALotInterval") \
2250 \
2251 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2252 "Metadata allocation failure a lot interval") \
2253 \
2254 develop(bool, TraceMetadataChunkAllocation, false, \
2255 "Trace chunk metadata allocations") \
2256 \
2257 product(bool, TraceMetadataHumongousAllocation, false, \
2258 "Trace humongous metadata allocations") \
2259 \
2260 develop(bool, TraceMetavirtualspaceAllocation, false, \
2261 "Trace virtual space metadata allocations") \
2262 \
2263 notproduct(bool, ExecuteInternalVMTests, false, \
2264 "Enable execution of internal VM tests") \
2265 \
2266 notproduct(bool, VerboseInternalVMTests, false, \
2267 "Turn on logging for internal VM tests.") \
2268 \
2269 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2270 \
2271 product_pd(bool, ResizeTLAB, \
2272 "Dynamically resize TLAB size for threads") \
2273 \
2274 product(bool, ZeroTLAB, false, \
2275 "Zero out the newly created TLAB") \
2276 \
2277 product(bool, FastTLABRefill, true, \
2278 "Use fast TLAB refill code") \
2279 \
2280 product(bool, PrintTLAB, false, \
2281 "Print various TLAB related information") \
2282 \
2283 product(bool, TLABStats, true, \
2284 "Provide more detailed and expensive TLAB statistics " \
2285 "(with PrintTLAB)") \
2286 \
2287 product_pd(bool, NeverActAsServerClassMachine, \
2288 "Never act like a server-class machine") \
2289 \
2290 product(bool, AlwaysActAsServerClassMachine, false, \
2291 "Always act like a server-class machine") \
2292 \
2293 product_pd(uint64_t, MaxRAM, \
2294 "Real memory size (in bytes) used to set maximum heap size") \
2295 \
2296 product(size_t, ErgoHeapSizeLimit, 0, \
2297 "Maximum ergonomically set heap size (in bytes); zero means use " \
2298 "MaxRAM / MaxRAMFraction") \
2299 \
2300 product(uintx, MaxRAMFraction, 4, \
2301 "Maximum fraction (1/n) of real memory used for maximum heap " \
2302 "size") \
2303 range(1, max_uintx) \
2304 \
2305 product(uintx, DefaultMaxRAMFraction, 4, \
2306 "Maximum fraction (1/n) of real memory used for maximum heap " \
2307 "size; deprecated: to be renamed to MaxRAMFraction") \
2308 range(1, max_uintx) \
2309 \
2310 product(uintx, MinRAMFraction, 2, \
2311 "Minimum fraction (1/n) of real memory used for maximum heap " \
2312 "size on systems with small physical memory size") \
2313 range(1, max_uintx) \
2314 \
2315 product(uintx, InitialRAMFraction, 64, \
2316 "Fraction (1/n) of real memory used for initial heap size") \
2317 range(1, max_uintx) \
2318 \
2319 develop(uintx, MaxVirtMemFraction, 2, \
2320 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2321 "determining maximum heap size") \
2322 \
2323 product(bool, UseAutoGCSelectPolicy, false, \
2324 "Use automatic collection selection policy") \
2325 \
2326 product(uintx, AutoGCSelectPauseMillis, 5000, \
2327 "Automatic GC selection pause threshold in milliseconds") \
2328 \
2329 product(bool, UseAdaptiveSizePolicy, true, \
2330 "Use adaptive generation sizing policies") \
2331 \
2332 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2333 "Use adaptive survivor sizing policies") \
2334 \
2335 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2336 "Use adaptive young-old sizing policies at minor collections") \
2337 \
2338 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2339 "Use adaptive young-old sizing policies at major collections") \
2340 \
2341 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2342 "Include statistics from System.gc() for adaptive size policy") \
2343 \
2344 product(bool, UseAdaptiveGCBoundary, false, \
2345 "Allow young-old boundary to move") \
2346 \
2347 develop(bool, TraceAdaptiveGCBoundary, false, \
2348 "Trace young-old boundary moves") \
2349 \
2350 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2351 "Resize the virtual spaces of the young or old generations") \
2352 \
2353 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2354 "Policy for changing generation size for throughput goals") \
2355 \
2356 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2357 "Adjust tenured generation to achieve a minor pause goal") \
2358 \
2359 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2360 "Adjust young generation to achieve a major pause goal") \
2361 \
2362 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2363 "Number of steps where heuristics is used before data is used") \
2364 \
2365 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2366 "Number of collections before the adaptive sizing is started") \
2367 \
2368 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2369 "Collection interval for printing information; zero means never") \
2370 \
2371 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2372 "Use adaptive minimum footprint as a goal") \
2373 \
2374 product(uintx, AdaptiveSizePolicyWeight, 10, \
2375 "Weight given to exponential resizing, between 0 and 100") \
2376 range(0, 100) \
2377 \
2378 product(uintx, AdaptiveTimeWeight, 25, \
2379 "Weight given to time in adaptive policy, between 0 and 100") \
2380 range(0, 100) \
2381 \
2382 product(uintx, PausePadding, 1, \
2383 "How much buffer to keep for pause time") \
2384 \
2385 product(uintx, PromotedPadding, 3, \
2386 "How much buffer to keep for promotion failure") \
2387 \
2388 product(uintx, SurvivorPadding, 3, \
2389 "How much buffer to keep for survivor overflow") \
2390 \
2391 product(uintx, ThresholdTolerance, 10, \
2392 "Allowed collection cost difference between generations") \
2393 range(0, 100) \
2394 \
2395 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2396 "If collection costs are within margin, reduce both by full " \
2397 "delta") \
2398 \
2399 product(uintx, YoungGenerationSizeIncrement, 20, \
2400 "Adaptive size percentage change in young generation") \
2401 range(0, 100) \
2402 \
2403 product(uintx, YoungGenerationSizeSupplement, 80, \
2404 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2405 range(0, 100) \
2406 \
2407 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2408 "Decay factor to YoungedGenerationSizeSupplement") \
2409 range(1, max_uintx) \
2410 \
2411 product(uintx, TenuredGenerationSizeIncrement, 20, \
2412 "Adaptive size percentage change in tenured generation") \
2413 range(0, 100) \
2414 \
2415 product(uintx, TenuredGenerationSizeSupplement, 80, \
2416 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2417 range(0, 100) \
2418 \
2419 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2420 "Decay factor to TenuredGenerationSizeIncrement") \
2421 range(1, max_uintx) \
2422 \
2423 product(uintx, MaxGCPauseMillis, max_uintx, \
2424 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2425 "or (G1 Only) the maximum GC time per MMU time slice") \
2426 \
2427 product(uintx, GCPauseIntervalMillis, 0, \
2428 "Time slice for MMU specification") \
2429 \
2430 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2431 "Adaptive size policy maximum GC minor pause time goal " \
2432 "in millisecond") \
2433 \
2434 product(uintx, GCTimeRatio, 99, \
2435 "Adaptive size policy application time to GC time ratio") \
2436 \
2437 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2438 "Adaptive size scale down factor for shrinking") \
2439 range(1, max_uintx) \
2440 \
2441 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2442 "Adaptive size decays the major cost for long major intervals") \
2443 \
2444 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2445 "Time scale over which major costs decay") \
2446 \
2447 product(uintx, MinSurvivorRatio, 3, \
2448 "Minimum ratio of young generation/survivor space size") \
2449 \
2450 product(uintx, InitialSurvivorRatio, 8, \
2451 "Initial ratio of young generation/survivor space size") \
2452 \
2453 product(size_t, BaseFootPrintEstimate, 256*M, \
2454 "Estimate of footprint other than Java Heap") \
2455 \
2456 product(bool, UseGCOverheadLimit, true, \
2457 "Use policy to limit of proportion of time spent in GC " \
2458 "before an OutOfMemory error is thrown") \
2459 \
2460 product(uintx, GCTimeLimit, 98, \
2461 "Limit of the proportion of time spent in GC before " \
2462 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2463 range(0, 100) \
2464 \
2465 product(uintx, GCHeapFreeLimit, 2, \
2466 "Minimum percentage of free space after a full GC before an " \
2467 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2468 range(0, 100) \
2469 \
2470 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2471 "Number of consecutive collections before gc time limit fires") \
2472 \
2473 product(bool, PrintAdaptiveSizePolicy, false, \
2474 "Print information about AdaptiveSizePolicy") \
2475 \
2476 product(intx, PrefetchCopyIntervalInBytes, -1, \
2477 "How far ahead to prefetch destination area (<= 0 means off)") \
2478 \
2479 product(intx, PrefetchScanIntervalInBytes, -1, \
2480 "How far ahead to prefetch scan area (<= 0 means off)") \
2481 \
2482 product(intx, PrefetchFieldsAhead, -1, \
2483 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2484 \
2485 diagnostic(bool, VerifySilently, false, \
2486 "Do not print the verification progress") \
2487 \
2488 diagnostic(bool, VerifyDuringStartup, false, \
2489 "Verify memory system before executing any Java code " \
2490 "during VM initialization") \
2491 \
2492 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2493 "Verify system before exiting") \
2494 \
2495 diagnostic(bool, VerifyBeforeGC, false, \
2496 "Verify memory system before GC") \
2497 \
2498 diagnostic(bool, VerifyAfterGC, false, \
2499 "Verify memory system after GC") \
2500 \
2501 diagnostic(bool, VerifyDuringGC, false, \
2502 "Verify memory system during GC (between phases)") \
2503 \
2504 diagnostic(bool, GCParallelVerificationEnabled, true, \
2505 "Enable parallel memory system verification") \
2506 \
2507 diagnostic(bool, DeferInitialCardMark, false, \
2508 "When +ReduceInitialCardMarks, explicitly defer any that " \
2509 "may arise from new_pre_store_barrier") \
2510 \
2511 product(bool, UseCondCardMark, false, \
2512 "Check for already marked card before updating card table") \
2513 \
2514 diagnostic(bool, VerifyRememberedSets, false, \
2515 "Verify GC remembered sets") \
2516 \
2517 diagnostic(bool, VerifyObjectStartArray, true, \
2518 "Verify GC object start array if verify before/after") \
2519 \
2520 product(bool, DisableExplicitGC, false, \
2521 "Ignore calls to System.gc()") \
2522 \
2523 notproduct(bool, CheckMemoryInitialization, false, \
2524 "Check memory initialization") \
2525 \
2526 diagnostic(bool, BindCMSThreadToCPU, false, \
2527 "Bind CMS Thread to CPU if possible") \
2528 \
2529 diagnostic(uintx, CPUForCMSThread, 0, \
2530 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2531 \
2532 product(bool, BindGCTaskThreadsToCPUs, false, \
2533 "Bind GCTaskThreads to CPUs if possible") \
2534 \
2535 product(bool, UseGCTaskAffinity, false, \
2536 "Use worker affinity when asking for GCTasks") \
2537 \
2538 product(uintx, ProcessDistributionStride, 4, \
2539 "Stride through processors when distributing processes") \
2540 \
2541 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2542 "Number of times the coordinator GC thread will sleep while " \
2543 "yielding before giving up and resuming GC") \
2544 \
2545 product(uintx, CMSYieldSleepCount, 0, \
2546 "Number of times a GC thread (minus the coordinator) " \
2547 "will sleep while yielding before giving up and resuming GC") \
2548 \
2549 /* gc tracing */ \
2550 manageable(bool, PrintGC, false, \
2551 "Print message at garbage collection") \
2552 \
2553 manageable(bool, PrintGCDetails, false, \
2554 "Print more details at garbage collection") \
2555 \
2556 manageable(bool, PrintGCDateStamps, false, \
2557 "Print date stamps at garbage collection") \
2558 \
2559 manageable(bool, PrintGCTimeStamps, false, \
2560 "Print timestamps at garbage collection") \
2561 \
2562 manageable(bool, PrintGCID, true, \
2563 "Print an identifier for each garbage collection") \
2564 \
2565 product(bool, PrintGCTaskTimeStamps, false, \
2566 "Print timestamps for individual gc worker thread tasks") \
2567 \
2568 develop(intx, ConcGCYieldTimeout, 0, \
2569 "If non-zero, assert that GC threads yield within this " \
2570 "number of milliseconds") \
2571 \
2572 product(bool, PrintReferenceGC, false, \
2573 "Print times spent handling reference objects during GC " \
2574 "(enabled only when PrintGCDetails)") \
2575 \
2576 develop(bool, TraceReferenceGC, false, \
2577 "Trace handling of soft/weak/final/phantom references") \
2578 \
2579 develop(bool, TraceFinalizerRegistration, false, \
2580 "Trace registration of final references") \
2581 \
2582 notproduct(bool, TraceScavenge, false, \
2583 "Trace scavenge") \
2584 \
2585 product(bool, IgnoreEmptyClassPaths, false, \
2586 "Ignore empty path elements in -classpath") \
2587 \
2588 product(bool, TraceClassPaths, false, \
2589 "Trace processing of class paths") \
2590 \
2591 product_rw(bool, TraceClassLoading, false, \
2592 "Trace all classes loaded") \
2593 \
2594 product(bool, TraceClassLoadingPreorder, false, \
2595 "Trace all classes loaded in order referenced (not loaded)") \
2596 \
2597 product_rw(bool, TraceClassUnloading, false, \
2598 "Trace unloading of classes") \
2599 \
2600 product_rw(bool, TraceLoaderConstraints, false, \
2601 "Trace loader constraints") \
2602 \
2603 develop(bool, TraceClassLoaderData, false, \
2604 "Trace class loader loader_data lifetime") \
2605 \
2606 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2607 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2608 "Initial size of the boot class loader data metaspace") \
2609 \
2610 product(bool, TraceYoungGenTime, false, \
2611 "Trace accumulated time for young collection") \
2612 \
2613 product(bool, TraceOldGenTime, false, \
2614 "Trace accumulated time for old collection") \
2615 \
2616 product(bool, PrintTenuringDistribution, false, \
2617 "Print tenuring age information") \
2618 \
2619 product_rw(bool, PrintHeapAtGC, false, \
2620 "Print heap layout before and after each GC") \
2621 \
2622 product_rw(bool, PrintHeapAtGCExtended, false, \
2623 "Print extended information about the layout of the heap " \
2624 "when -XX:+PrintHeapAtGC is set") \
2625 \
2626 product(bool, PrintHeapAtSIGBREAK, true, \
2627 "Print heap layout in response to SIGBREAK") \
2628 \
2629 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2630 "Print a class histogram before any major stop-world GC") \
2631 \
2632 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2633 "Print a class histogram after any major stop-world GC") \
2634 \
2635 manageable(bool, PrintClassHistogram, false, \
2636 "Print a histogram of class instances") \
2637 \
2638 develop(bool, TraceWorkGang, false, \
2639 "Trace activities of work gangs") \
2640 \
2641 product(bool, TraceParallelOldGCTasks, false, \
2642 "Trace multithreaded GC activity") \
2643 \
2644 develop(bool, TraceBlockOffsetTable, false, \
2645 "Print BlockOffsetTable maps") \
2646 \
2647 develop(bool, TraceCardTableModRefBS, false, \
2648 "Print CardTableModRefBS maps") \
2649 \
2650 develop(bool, TraceGCTaskManager, false, \
2651 "Trace actions of the GC task manager") \
2652 \
2653 develop(bool, TraceGCTaskQueue, false, \
2654 "Trace actions of the GC task queues") \
2655 \
2656 diagnostic(bool, TraceGCTaskThread, false, \
2657 "Trace actions of the GC task threads") \
2658 \
2659 product(bool, PrintParallelOldGCPhaseTimes, false, \
2660 "Print the time taken by each phase in ParallelOldGC " \
2661 "(PrintGCDetails must also be enabled)") \
2662 \
2663 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2664 "Trace marking phase in ParallelOldGC") \
2665 \
2666 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2667 "Trace summary phase in ParallelOldGC") \
2668 \
2669 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2670 "Trace compaction phase in ParallelOldGC") \
2671 \
2672 develop(bool, TraceParallelOldGCDensePrefix, false, \
2673 "Trace dense prefix computation for ParallelOldGC") \
2674 \
2675 develop(bool, IgnoreLibthreadGPFault, false, \
2676 "Suppress workaround for libthread GP fault") \
2677 \
2678 product(bool, PrintJNIGCStalls, false, \
2679 "Print diagnostic message when GC is stalled " \
2680 "by JNI critical section") \
2681 \
2682 experimental(double, ObjectCountCutOffPercent, 0.5, \
2683 "The percentage of the used heap that the instances of a class " \
2684 "must occupy for the class to generate a trace event") \
2685 \
2686 /* GC log rotation setting */ \
2687 \
2688 product(bool, UseGCLogFileRotation, false, \
2689 "Rotate gclog files (for long running applications). It requires "\
2690 "-Xloggc:<filename>") \
2691 \
2692 product(uintx, NumberOfGCLogFiles, 0, \
2693 "Number of gclog files in rotation " \
2694 "(default: 0, no rotation)") \
2695 \
2696 product(size_t, GCLogFileSize, 8*K, \
2697 "GC log file size, requires UseGCLogFileRotation. " \
2698 "Set to 0 to only trigger rotation via jcmd") \
2699 \
2700 /* JVMTI heap profiling */ \
2701 \
2702 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2703 "Trace JVMTI object tagging calls") \
2704 \
2705 diagnostic(bool, VerifyBeforeIteration, false, \
2706 "Verify memory system before JVMTI iteration") \
2707 \
2708 /* compiler interface */ \
2709 \
2710 develop(bool, CIPrintCompilerName, false, \
2711 "when CIPrint is active, print the name of the active compiler") \
2712 \
2713 diagnostic(bool, CIPrintCompileQueue, false, \
2714 "display the contents of the compile queue whenever a " \
2715 "compilation is enqueued") \
2716 \
2717 develop(bool, CIPrintRequests, false, \
2718 "display every request for compilation") \
2719 \
2720 product(bool, CITime, false, \
2721 "collect timing information for compilation") \
2722 \
2723 develop(bool, CITimeVerbose, false, \
2724 "be more verbose in compilation timings") \
2725 \
2726 develop(bool, CITimeEach, false, \
2727 "display timing information after each successful compilation") \
2728 \
2729 develop(bool, CICountOSR, false, \
2730 "use a separate counter when assigning ids to osr compilations") \
2731 \
2732 develop(bool, CICompileNatives, true, \
2733 "compile native methods if supported by the compiler") \
2734 \
2735 develop_pd(bool, CICompileOSR, \
2736 "compile on stack replacement methods if supported by the " \
2737 "compiler") \
2738 \
2739 develop(bool, CIPrintMethodCodes, false, \
2740 "print method bytecodes of the compiled code") \
2741 \
2742 develop(bool, CIPrintTypeFlow, false, \
2743 "print the results of ciTypeFlow analysis") \
2744 \
2745 develop(bool, CITraceTypeFlow, false, \
2746 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2747 \
2748 develop(intx, OSROnlyBCI, -1, \
2749 "OSR only at this bci. Negative values mean exclude that bci") \
2750 \
2751 /* compiler */ \
2752 \
2753 /* notice: the max range value here is max_jint, not max_intx */ \
2754 /* because of overflow issue */ \
2755 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2756 "Number of compiler threads to run") \
2757 range(0, max_jint) \
2758 constraint(CICompilerCountConstraintFunc, AtParse) \
2759 \
2760 product(intx, CompilationPolicyChoice, 0, \
2761 "which compilation policy (0-3)") \
2762 range(0, 3) \
2763 \
2764 develop(bool, UseStackBanging, true, \
2765 "use stack banging for stack overflow checks (required for " \
2766 "proper StackOverflow handling; disable only to measure cost " \
2767 "of stackbanging)") \
2768 \
2769 develop(bool, UseStrictFP, true, \
2770 "use strict fp if modifier strictfp is set") \
2771 \
2772 develop(bool, GenerateSynchronizationCode, true, \
2773 "generate locking/unlocking code for synchronized methods and " \
2774 "monitors") \
2775 \
2776 develop(bool, GenerateCompilerNullChecks, true, \
2777 "Generate explicit null checks for loads/stores/calls") \
2778 \
2779 develop(bool, GenerateRangeChecks, true, \
2780 "Generate range checks for array accesses") \
2781 \
2782 develop_pd(bool, ImplicitNullChecks, \
2783 "Generate code for implicit null checks") \
2784 \
2785 product_pd(bool, TrapBasedNullChecks, \
2786 "Generate code for null checks that uses a cmp and trap " \
2787 "instruction raising SIGTRAP. This is only used if an access to" \
2788 "null (+offset) will not raise a SIGSEGV, i.e.," \
2789 "ImplicitNullChecks don't work (PPC64).") \
2790 \
2791 product(bool, PrintSafepointStatistics, false, \
2792 "Print statistics about safepoint synchronization") \
2793 \
2794 product(intx, PrintSafepointStatisticsCount, 300, \
2795 "Total number of safepoint statistics collected " \
2796 "before printing them out") \
2797 \
2798 product(intx, PrintSafepointStatisticsTimeout, -1, \
2799 "Print safepoint statistics only when safepoint takes " \
2800 "more than PrintSafepointSatisticsTimeout in millis") \
2801 \
2802 product(bool, TraceSafepointCleanupTime, false, \
2803 "Print the break down of clean up tasks performed during " \
2804 "safepoint") \
2805 \
2806 product(bool, Inline, true, \
2807 "Enable inlining") \
2808 \
2809 product(bool, ClipInlining, true, \
2810 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2811 \
2812 develop(bool, UseCHA, true, \
2813 "Enable CHA") \
2814 \
2815 product(bool, UseTypeProfile, true, \
2816 "Check interpreter profile for historically monomorphic calls") \
2817 \
2818 diagnostic(bool, PrintInlining, false, \
2819 "Print inlining optimizations") \
2820 \
2821 product(bool, UsePopCountInstruction, false, \
2822 "Use population count instruction") \
2823 \
2824 develop(bool, EagerInitialization, false, \
2825 "Eagerly initialize classes if possible") \
2826 \
2827 diagnostic(bool, LogTouchedMethods, false, \
2828 "Log methods which have been ever touched in runtime") \
2829 \
2830 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2831 "Print all methods that have been ever touched in runtime") \
2832 \
2833 develop(bool, TraceMethodReplacement, false, \
2834 "Print when methods are replaced do to recompilation") \
2835 \
2836 develop(bool, PrintMethodFlushing, false, \
2837 "Print the nmethods being flushed") \
2838 \
2839 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2840 "print statistics about method flushing") \
2841 \
2842 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2843 "Number of compiled code invocations after which " \
2844 "the method is considered as hot by the flusher") \
2845 \
2846 diagnostic(intx, MinPassesBeforeFlush, 10, \
2847 "Minimum number of sweeper passes before an nmethod " \
2848 "can be flushed") \
2849 \
2850 product(bool, UseCodeAging, true, \
2851 "Insert counter to detect warm methods") \
2852 \
2853 diagnostic(bool, StressCodeAging, false, \
2854 "Start with counters compiled in") \
2855 \
2856 develop(bool, UseRelocIndex, false, \
2857 "Use an index to speed random access to relocations") \
2858 \
2859 develop(bool, StressCodeBuffers, false, \
2860 "Exercise code buffer expansion and other rare state changes") \
2861 \
2862 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2863 "Generate extra debugging information for non-safepoints in " \
2864 "nmethods") \
2865 \
2866 product(bool, PrintVMOptions, false, \
2867 "Print flags that appeared on the command line") \
2868 \
2869 product(bool, IgnoreUnrecognizedVMOptions, false, \
2870 "Ignore unrecognized VM options") \
2871 \
2872 product(bool, PrintCommandLineFlags, false, \
2873 "Print flags specified on command line or set by ergonomics") \
2874 \
2875 product(bool, PrintFlagsInitial, false, \
2876 "Print all VM flags before argument processing and exit VM") \
2877 \
2878 product(bool, PrintFlagsFinal, false, \
2879 "Print all VM flags after argument and ergonomic processing") \
2880 \
2881 notproduct(bool, PrintFlagsWithComments, false, \
2882 "Print all VM flags with default values and descriptions and " \
2883 "exit") \
2884 \
2885 product(bool, PrintFlagsRanges, false, \
2886 "Print VM flags and their ranges and exit VM") \
2887 \
2888 diagnostic(bool, SerializeVMOutput, true, \
2889 "Use a mutex to serialize output to tty and LogFile") \
2890 \
2891 diagnostic(bool, DisplayVMOutput, true, \
2892 "Display all VM output on the tty, independently of LogVMOutput") \
2893 \
2894 diagnostic(bool, LogVMOutput, false, \
2895 "Save VM output to LogFile") \
2896 \
2897 diagnostic(ccstr, LogFile, NULL, \
2898 "If LogVMOutput or LogCompilation is on, save VM output to " \
2899 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2900 \
2901 product(ccstr, ErrorFile, NULL, \
2902 "If an error occurs, save the error data to this file " \
2903 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2904 \
2905 product(bool, DisplayVMOutputToStderr, false, \
2906 "If DisplayVMOutput is true, display all VM output to stderr") \
2907 \
2908 product(bool, DisplayVMOutputToStdout, false, \
2909 "If DisplayVMOutput is true, display all VM output to stdout") \
2910 \
2911 product(bool, UseHeavyMonitors, false, \
2912 "use heavyweight instead of lightweight Java monitors") \
2913 \
2914 product(bool, PrintStringTableStatistics, false, \
2915 "print statistics about the StringTable and SymbolTable") \
2916 \
2917 diagnostic(bool, VerifyStringTableAtExit, false, \
2918 "verify StringTable contents at exit") \
2919 \
2920 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2921 "print histogram of the symbol table") \
2922 \
2923 notproduct(bool, ExitVMOnVerifyError, false, \
2924 "standard exit from VM if bytecode verify error " \
2925 "(only in debug mode)") \
2926 \
2927 notproduct(ccstr, AbortVMOnException, NULL, \
2928 "Call fatal if this exception is thrown. Example: " \
2929 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2930 \
2931 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2932 "Call fatal if the exception pointed by AbortVMOnException " \
2933 "has this message") \
2934 \
2935 develop(bool, DebugVtables, false, \
2936 "add debugging code to vtable dispatch") \
2937 \
2938 develop(bool, PrintVtables, false, \
2939 "print vtables when printing klass") \
2940 \
2941 notproduct(bool, PrintVtableStats, false, \
2942 "print vtables stats at end of run") \
2943 \
2944 develop(bool, TraceCreateZombies, false, \
2945 "trace creation of zombie nmethods") \
2946 \
2947 notproduct(bool, IgnoreLockingAssertions, false, \
2948 "disable locking assertions (for speed)") \
2949 \
2950 product(bool, RangeCheckElimination, true, \
2951 "Eliminate range checks") \
2952 \
2953 develop_pd(bool, UncommonNullCast, \
2954 "track occurrences of null in casts; adjust compiler tactics") \
2955 \
2956 develop(bool, TypeProfileCasts, true, \
2957 "treat casts like calls for purposes of type profiling") \
2958 \
2959 develop(bool, DelayCompilationDuringStartup, true, \
2960 "Delay invoking the compiler until main application class is " \
2961 "loaded") \
2962 \
2963 develop(bool, CompileTheWorld, false, \
2964 "Compile all methods in all classes in bootstrap class path " \
2965 "(stress test)") \
2966 \
2967 develop(bool, CompileTheWorldPreloadClasses, true, \
2968 "Preload all classes used by a class before start loading") \
2969 \
2970 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2971 "Force a safepoint every n compiles so sweeper can keep up") \
2972 \
2973 develop(bool, FillDelaySlots, true, \
2974 "Fill delay slots (on SPARC only)") \
2975 \
2976 develop(bool, TimeLivenessAnalysis, false, \
2977 "Time computation of bytecode liveness analysis") \
2978 \
2979 develop(bool, TraceLivenessGen, false, \
2980 "Trace the generation of liveness analysis information") \
2981 \
2982 notproduct(bool, TraceLivenessQuery, false, \
2983 "Trace queries of liveness analysis information") \
2984 \
2985 notproduct(bool, CollectIndexSetStatistics, false, \
2986 "Collect information about IndexSets") \
2987 \
2988 develop(bool, UseLoopSafepoints, true, \
2989 "Generate Safepoint nodes in every loop") \
2990 \
2991 develop(intx, FastAllocateSizeLimit, 128*K, \
2992 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2993 "Inline allocations larger than this in doublewords must go slow")\
2994 \
2995 product(bool, AggressiveOpts, false, \
2996 "Enable aggressive optimizations - see arguments.cpp") \
2997 \
2998 product_pd(uintx, TypeProfileLevel, \
2999 "=XYZ, with Z: Type profiling of arguments at call; " \
3000 "Y: Type profiling of return value at call; " \
3001 "X: Type profiling of parameters to methods; " \
3002 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
3003 \
3004 product(intx, TypeProfileArgsLimit, 2, \
3005 "max number of call arguments to consider for type profiling") \
3006 \
3007 product(intx, TypeProfileParmsLimit, 2, \
3008 "max number of incoming parameters to consider for type profiling"\
3009 ", -1 for all") \
3010 \
3011 /* statistics */ \
3012 develop(bool, CountCompiledCalls, false, \
3013 "Count method invocations") \
3014 \
3015 notproduct(bool, CountRuntimeCalls, false, \
3016 "Count VM runtime calls") \
3017 \
3018 develop(bool, CountJNICalls, false, \
3019 "Count jni method invocations") \
3020 \
3021 notproduct(bool, CountJVMCalls, false, \
3022 "Count jvm method invocations") \
3023 \
3024 notproduct(bool, CountRemovableExceptions, false, \
3025 "Count exceptions that could be replaced by branches due to " \
3026 "inlining") \
3027 \
3028 notproduct(bool, ICMissHistogram, false, \
3029 "Produce histogram of IC misses") \
3030 \
3031 /* interpreter */ \
3032 develop(bool, ClearInterpreterLocals, false, \
3033 "Always clear local variables of interpreter activations upon " \
3034 "entry") \
3035 \
3036 product_pd(bool, RewriteBytecodes, \
3037 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
3038 \
3039 product_pd(bool, RewriteFrequentPairs, \
3040 "Rewrite frequently used bytecode pairs into a single bytecode") \
3041 \
3042 diagnostic(bool, PrintInterpreter, false, \
3043 "Print the generated interpreter code") \
3044 \
3045 product(bool, UseInterpreter, true, \
3046 "Use interpreter for non-compiled methods") \
3047 \
3048 develop(bool, UseFastSignatureHandlers, true, \
3049 "Use fast signature handlers for native calls") \
3050 \
3051 product(bool, UseLoopCounter, true, \
3052 "Increment invocation counter on backward branch") \
3053 \
3054 product_pd(bool, UseOnStackReplacement, \
3055 "Use on stack replacement, calls runtime if invoc. counter " \
3056 "overflows in loop") \
3057 \
3058 notproduct(bool, TraceOnStackReplacement, false, \
3059 "Trace on stack replacement") \
3060 \
3061 product_pd(bool, PreferInterpreterNativeStubs, \
3062 "Use always interpreter stubs for native methods invoked via " \
3063 "interpreter") \
3064 \
3065 develop(bool, CountBytecodes, false, \
3066 "Count number of bytecodes executed") \
3067 \
3068 develop(bool, PrintBytecodeHistogram, false, \
3069 "Print histogram of the executed bytecodes") \
3070 \
3071 develop(bool, PrintBytecodePairHistogram, false, \
3072 "Print histogram of the executed bytecode pairs") \
3073 \
3074 diagnostic(bool, PrintSignatureHandlers, false, \
3075 "Print code generated for native method signature handlers") \
3076 \
3077 develop(bool, VerifyOops, false, \
3078 "Do plausibility checks for oops") \
3079 \
3080 develop(bool, CheckUnhandledOops, false, \
3081 "Check for unhandled oops in VM code") \
3082 \
3083 develop(bool, VerifyJNIFields, trueInDebug, \
3084 "Verify jfieldIDs for instance fields") \
3085 \
3086 notproduct(bool, VerifyJNIEnvThread, false, \
3087 "Verify JNIEnv.thread == Thread::current() when entering VM " \
3088 "from JNI") \
3089 \
3090 develop(bool, VerifyFPU, false, \
3091 "Verify FPU state (check for NaN's, etc.)") \
3092 \
3093 develop(bool, VerifyThread, false, \
3094 "Watch the thread register for corruption (SPARC only)") \
3095 \
3096 develop(bool, VerifyActivationFrameSize, false, \
3097 "Verify that activation frame didn't become smaller than its " \
3098 "minimal size") \
3099 \
3100 develop(bool, TraceFrequencyInlining, false, \
3101 "Trace frequency based inlining") \
3102 \
3103 develop_pd(bool, InlineIntrinsics, \
3104 "Inline intrinsics that can be statically resolved") \
3105 \
3106 product_pd(bool, ProfileInterpreter, \
3107 "Profile at the bytecode level during interpretation") \
3108 \
3109 develop(bool, TraceProfileInterpreter, false, \
3110 "Trace profiling at the bytecode level during interpretation. " \
3111 "This outputs the profiling information collected to improve " \
3112 "jit compilation.") \
3113 \
3114 develop_pd(bool, ProfileTraps, \
3115 "Profile deoptimization traps at the bytecode level") \
3116 \
3117 product(intx, ProfileMaturityPercentage, 20, \
3118 "number of method invocations/branches (expressed as % of " \
3119 "CompileThreshold) before using the method's profile") \
3120 range(0, 100) \
3121 \
3122 diagnostic(bool, PrintMethodData, false, \
3123 "Print the results of +ProfileInterpreter at end of run") \
3124 \
3125 develop(bool, VerifyDataPointer, trueInDebug, \
3126 "Verify the method data pointer during interpreter profiling") \
3127 \
3128 develop(bool, VerifyCompiledCode, false, \
3129 "Include miscellaneous runtime verifications in nmethod code; " \
3130 "default off because it disturbs nmethod size heuristics") \
3131 \
3132 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3133 "Manually make GC thread crash then dump java stack trace; " \
3134 "Test only") \
3135 \
3136 /* compilation */ \
3137 product(bool, UseCompiler, true, \
3138 "Use Just-In-Time compilation") \
3139 \
3140 develop(bool, TraceCompilationPolicy, false, \
3141 "Trace compilation policy") \
3142 \
3143 develop(bool, TimeCompilationPolicy, false, \
3144 "Time the compilation policy") \
3145 \
3146 product(bool, UseCounterDecay, true, \
3147 "Adjust recompilation counters") \
3148 \
3149 develop(intx, CounterHalfLifeTime, 30, \
3150 "Half-life time of invocation counters (in seconds)") \
3151 \
3152 develop(intx, CounterDecayMinIntervalLength, 500, \
3153 "The minimum interval (in milliseconds) between invocation of " \
3154 "CounterDecay") \
3155 \
3156 product(bool, AlwaysCompileLoopMethods, false, \
3157 "When using recompilation, never interpret methods " \
3158 "containing loops") \
3159 \
3160 product(bool, DontCompileHugeMethods, true, \
3161 "Do not compile methods > HugeMethodLimit") \
3162 \
3163 /* Bytecode escape analysis estimation. */ \
3164 product(bool, EstimateArgEscape, true, \
3165 "Analyze bytecodes to estimate escape state of arguments") \
3166 \
3167 product(intx, BCEATraceLevel, 0, \
3168 "How much tracing to do of bytecode escape analysis estimates") \
3169 \
3170 product(intx, MaxBCEAEstimateLevel, 5, \
3171 "Maximum number of nested calls that are analyzed by BC EA") \
3172 \
3173 product(intx, MaxBCEAEstimateSize, 150, \
3174 "Maximum bytecode size of a method to be analyzed by BC EA") \
3175 \
3176 product(intx, AllocatePrefetchStyle, 1, \
3177 "0 = no prefetch, " \
3178 "1 = prefetch instructions for each allocation, " \
3179 "2 = use TLAB watermark to gate allocation prefetch, " \
3180 "3 = use BIS instruction on Sparc for allocation prefetch") \
3181 range(0, 3) \
3182 \
3183 product(intx, AllocatePrefetchDistance, -1, \
3184 "Distance to prefetch ahead of allocation pointer") \
3185 \
3186 product(intx, AllocatePrefetchLines, 3, \
3187 "Number of lines to prefetch ahead of array allocation pointer") \
3188 \
3189 product(intx, AllocateInstancePrefetchLines, 1, \
3190 "Number of lines to prefetch ahead of instance allocation " \
3191 "pointer") \
3192 \
3193 product(intx, AllocatePrefetchStepSize, 16, \
3194 "Step size in bytes of sequential prefetch instructions") \
3195 \
3196 product(intx, AllocatePrefetchInstr, 0, \
3197 "Prefetch instruction to prefetch ahead of allocation pointer") \
3198 \
3199 /* deoptimization */ \
3200 develop(bool, TraceDeoptimization, false, \
3201 "Trace deoptimization") \
3202 \
3203 develop(bool, DebugDeoptimization, false, \
3204 "Tracing various information while debugging deoptimization") \
3205 \
3206 product(intx, SelfDestructTimer, 0, \
3207 "Will cause VM to terminate after a given time (in minutes) " \
3208 "(0 means off)") \
3209 \
3210 product(intx, MaxJavaStackTraceDepth, 1024, \
3211 "The maximum number of lines in the stack trace for Java " \
3212 "exceptions (0 means all)") \
3213 \
3214 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3215 "Guarantee a safepoint (at least) every so many milliseconds " \
3216 "(0 means none)")) \
3217 \
3218 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3219 "Guarantee a safepoint (at least) every so many milliseconds " \
3220 "(0 means none)")) \
3221 \
3222 product(intx, SafepointTimeoutDelay, 10000, \
3223 "Delay in milliseconds for option SafepointTimeout") \
3224 \
3225 product(intx, NmethodSweepActivity, 10, \
3226 "Removes cold nmethods from code cache if > 0. Higher values " \
3227 "result in more aggressive sweeping") \
3228 range(0, 2000) \
3229 \
3230 notproduct(bool, LogSweeper, false, \
3231 "Keep a ring buffer of sweeper activity") \
3232 \
3233 notproduct(intx, SweeperLogEntries, 1024, \
3234 "Number of records in the ring buffer of sweeper activity") \
3235 \
3236 notproduct(intx, MemProfilingInterval, 500, \
3237 "Time between each invocation of the MemProfiler") \
3238 \
3239 develop(intx, MallocCatchPtr, -1, \
3240 "Hit breakpoint when mallocing/freeing this pointer") \
3241 \
3242 notproduct(ccstrlist, SuppressErrorAt, "", \
3243 "List of assertions (file:line) to muzzle") \
3244 \
3245 notproduct(size_t, HandleAllocationLimit, 1024, \
3246 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3247 "is used") \
3248 \
3249 develop(size_t, TotalHandleAllocationLimit, 1024, \
3250 "Threshold for total handle allocation when " \
3251 "+TraceHandleAllocation is used") \
3252 \
3253 develop(intx, StackPrintLimit, 100, \
3254 "number of stack frames to print in VM-level stack dump") \
3255 \
3256 notproduct(intx, MaxElementPrintSize, 256, \
3257 "maximum number of elements to print") \
3258 \
3259 notproduct(intx, MaxSubklassPrintSize, 4, \
3260 "maximum number of subklasses to print when printing klass") \
3261 \
3262 product(intx, MaxInlineLevel, 9, \
3263 "maximum number of nested calls that are inlined") \
3264 \
3265 product(intx, MaxRecursiveInlineLevel, 1, \
3266 "maximum number of nested recursive calls that are inlined") \
3267 \
3268 develop(intx, MaxForceInlineLevel, 100, \
3269 "maximum number of nested calls that are forced for inlining " \
3270 "(using CompilerOracle or marked w/ @ForceInline)") \
3271 \
3272 product_pd(intx, InlineSmallCode, \
3273 "Only inline already compiled methods if their code size is " \
3274 "less than this") \
3275 \
3276 product(intx, MaxInlineSize, 35, \
3277 "The maximum bytecode size of a method to be inlined") \
3278 \
3279 product_pd(intx, FreqInlineSize, \
3280 "The maximum bytecode size of a frequent method to be inlined") \
3281 \
3282 product(intx, MaxTrivialSize, 6, \
3283 "The maximum bytecode size of a trivial method to be inlined") \
3284 \
3285 product(intx, MinInliningThreshold, 250, \
3286 "The minimum invocation count a method needs to have to be " \
3287 "inlined") \
3288 \
3289 develop(intx, MethodHistogramCutoff, 100, \
3290 "The cutoff value for method invocation histogram (+CountCalls)") \
3291 \
3292 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3293 "Number of interpreted methods to show in profile") \
3294 \
3295 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3296 "Number of compiled methods to show in profile") \
3297 \
3298 develop(intx, ProfilerNumberOfStubMethods, 25, \
3299 "Number of stub methods to show in profile") \
3300 \
3301 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3302 "Number of runtime stub nodes to show in profile") \
3303 \
3304 product(intx, ProfileIntervalsTicks, 100, \
3305 "Number of ticks between printing of interval profile " \
3306 "(+ProfileIntervals)") \
3307 \
3308 notproduct(intx, ScavengeALotInterval, 1, \
3309 "Interval between which scavenge will occur with +ScavengeALot") \
3310 \
3311 notproduct(intx, FullGCALotInterval, 1, \
3312 "Interval between which full gc will occur with +FullGCALot") \
3313 \
3314 notproduct(intx, FullGCALotStart, 0, \
3315 "For which invocation to start FullGCAlot") \
3316 \
3317 notproduct(intx, FullGCALotDummies, 32*K, \
3318 "Dummy object allocated with +FullGCALot, forcing all objects " \
3319 "to move") \
3320 \
3321 develop(intx, DontYieldALotInterval, 10, \
3322 "Interval between which yields will be dropped (milliseconds)") \
3323 \
3324 develop(intx, MinSleepInterval, 1, \
3325 "Minimum sleep() interval (milliseconds) when " \
3326 "ConvertSleepToYield is off (used for Solaris)") \
3327 \
3328 develop(intx, ProfilerPCTickThreshold, 15, \
3329 "Number of ticks in a PC buckets to be a hotspot") \
3330 \
3331 notproduct(intx, DeoptimizeALotInterval, 5, \
3332 "Number of exits until DeoptimizeALot kicks in") \
3333 \
3334 notproduct(intx, ZombieALotInterval, 5, \
3335 "Number of exits until ZombieALot kicks in") \
3336 \
3337 diagnostic(intx, MallocVerifyInterval, 0, \
3338 "If non-zero, verify C heap after every N calls to " \
3339 "malloc/realloc/free") \
3340 \
3341 diagnostic(intx, MallocVerifyStart, 0, \
3342 "If non-zero, start verifying C heap after Nth call to " \
3343 "malloc/realloc/free") \
3344 \
3345 diagnostic(uintx, MallocMaxTestWords, 0, \
3346 "If non-zero, maximum number of words that malloc/realloc can " \
3347 "allocate (for testing only)") \
3348 \
3349 product(intx, TypeProfileWidth, 2, \
3350 "Number of receiver types to record in call/cast profile") \
3351 \
3352 develop(intx, BciProfileWidth, 2, \
3353 "Number of return bci's to record in ret profile") \
3354 \
3355 product(intx, PerMethodRecompilationCutoff, 400, \
3356 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3357 range(-1, max_intx) \
3358 \
3359 product(intx, PerBytecodeRecompilationCutoff, 200, \
3360 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3361 range(-1, max_intx) \
3362 \
3363 product(intx, PerMethodTrapLimit, 100, \
3364 "Limit on traps (of one kind) in a method (includes inlines)") \
3365 \
3366 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3367 "Limit on speculative traps (of one kind) in a method " \
3368 "(includes inlines)") \
3369 \
3370 product(intx, PerBytecodeTrapLimit, 4, \
3371 "Limit on traps (of one kind) at a particular BCI") \
3372 \
3373 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3374 "Extra method data trap entries for speculation") \
3375 \
3376 develop(intx, InlineFrequencyRatio, 20, \
3377 "Ratio of call site execution to caller method invocation") \
3378 \
3379 develop_pd(intx, InlineFrequencyCount, \
3380 "Count of call site execution necessary to trigger frequent " \
3381 "inlining") \
3382 \
3383 develop(intx, InlineThrowCount, 50, \
3384 "Force inlining of interpreted methods that throw this often") \
3385 \
3386 develop(intx, InlineThrowMaxSize, 200, \
3387 "Force inlining of throwing methods smaller than this") \
3388 \
3389 develop(intx, ProfilerNodeSize, 1024, \
3390 "Size in K to allocate for the Profile Nodes of each thread") \
3391 \
3392 /* gc parameters */ \
3393 product(size_t, InitialHeapSize, 0, \
3394 "Initial heap size (in bytes); zero means use ergonomics") \
3395 \
3396 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3397 "Maximum heap size (in bytes)") \
3398 \
3399 product(size_t, OldSize, ScaleForWordSize(4*M), \
3400 "Initial tenured generation size (in bytes)") \
3401 \
3402 product(size_t, NewSize, ScaleForWordSize(1*M), \
3403 "Initial new generation size (in bytes)") \
3404 \
3405 product(size_t, MaxNewSize, max_uintx, \
3406 "Maximum new generation size (in bytes), max_uintx means set " \
3407 "ergonomically") \
3408 \
3409 product(size_t, PretenureSizeThreshold, 0, \
3410 "Maximum size in bytes of objects allocated in DefNew " \
3411 "generation; zero means no maximum") \
3412 \
3413 product(size_t, TLABSize, 0, \
3414 "Starting TLAB size (in bytes); zero means set ergonomically") \
3415 \
3416 product(size_t, MinTLABSize, 2*K, \
3417 "Minimum allowed TLAB size (in bytes)") \
3418 range(1, max_uintx) \
3419 \
3420 product(uintx, TLABAllocationWeight, 35, \
3421 "Allocation averaging weight") \
3422 range(0, 100) \
3423 \
3424 /* Limit the lower bound of this flag to 1 as it is used */ \
3425 /* in a division expression. */ \
3426 product(uintx, TLABWasteTargetPercent, 1, \
3427 "Percentage of Eden that can be wasted") \
3428 range(1, 100) \
3429 \
3430 product(uintx, TLABRefillWasteFraction, 64, \
3431 "Maximum TLAB waste at a refill (internal fragmentation)") \
3432 range(1, max_uintx) \
3433 \
3434 product(uintx, TLABWasteIncrement, 4, \
3435 "Increment allowed waste at slow allocation") \
3436 \
3437 product(uintx, SurvivorRatio, 8, \
3438 "Ratio of eden/survivor space size") \
3439 \
3440 product(uintx, NewRatio, 2, \
3441 "Ratio of old/new generation sizes") \
3442 \
3443 product_pd(size_t, NewSizeThreadIncrease, \
3444 "Additional size added to desired new generation size per " \
3445 "non-daemon thread (in bytes)") \
3446 \
3447 product_pd(size_t, MetaspaceSize, \
3448 "Initial size of Metaspaces (in bytes)") \
3449 \
3450 product(size_t, MaxMetaspaceSize, max_uintx, \
3451 "Maximum size of Metaspaces (in bytes)") \
3452 \
3453 product(size_t, CompressedClassSpaceSize, 1*G, \
3454 "Maximum size of class area in Metaspace when compressed " \
3455 "class pointers are used") \
3456 range(1*M, 3*G) \
3457 \
3458 manageable(uintx, MinHeapFreeRatio, 40, \
3459 "The minimum percentage of heap free after GC to avoid expansion."\
3460 " For most GCs this applies to the old generation. In G1 and" \
3461 " ParallelGC it applies to the whole heap.") \
3462 range(0, 100) \
3463 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3464 \
3465 manageable(uintx, MaxHeapFreeRatio, 70, \
3466 "The maximum percentage of heap free after GC to avoid shrinking."\
3467 " For most GCs this applies to the old generation. In G1 and" \
3468 " ParallelGC it applies to the whole heap.") \
3469 range(0, 100) \
3470 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3471 \
3472 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3473 "Number of milliseconds per MB of free space in the heap") \
3474 \
3475 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3476 "The minimum change in heap space due to GC (in bytes)") \
3477 \
3478 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3479 "The minimum expansion of Metaspace (in bytes)") \
3480 \
3481 product(uintx, MaxMetaspaceFreeRatio, 70, \
3482 "The maximum percentage of Metaspace free after GC to avoid " \
3483 "shrinking") \
3484 range(0, 100) \
3485 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3486 \
3487 product(uintx, MinMetaspaceFreeRatio, 40, \
3488 "The minimum percentage of Metaspace free after GC to avoid " \
3489 "expansion") \
3490 range(0, 99) \
3491 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3492 \
3493 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3494 "The maximum expansion of Metaspace without full GC (in bytes)") \
3495 \
3496 product(uintx, QueuedAllocationWarningCount, 0, \
3497 "Number of times an allocation that queues behind a GC " \
3498 "will retry before printing a warning") \
3499 \
3500 diagnostic(uintx, VerifyGCStartAt, 0, \
3501 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3502 \
3503 diagnostic(intx, VerifyGCLevel, 0, \
3504 "Generation level at which to start +VerifyBefore/AfterGC") \
3505 \
3506 product(uintx, MaxTenuringThreshold, 15, \
3507 "Maximum value for tenuring threshold") \
3508 range(0, markOopDesc::max_age + 1) \
3509 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3510 \
3511 product(uintx, InitialTenuringThreshold, 7, \
3512 "Initial value for tenuring threshold") \
3513 range(0, markOopDesc::max_age + 1) \
3514 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3515 \
3516 product(uintx, TargetSurvivorRatio, 50, \
3517 "Desired percentage of survivor space used after scavenge") \
3518 range(0, 100) \
3519 \
3520 product(uintx, MarkSweepDeadRatio, 5, \
3521 "Percentage (0-100) of the old gen allowed as dead wood. " \
3522 "Serial mark sweep treats this as both the minimum and maximum " \
3523 "value. " \
3524 "CMS uses this value only if it falls back to mark sweep. " \
3525 "Par compact uses a variable scale based on the density of the " \
3526 "generation and treats this as the maximum value when the heap " \
3527 "is either completely full or completely empty. Par compact " \
3528 "also has a smaller default value; see arguments.cpp.") \
3529 range(0, 100) \
3530 \
3531 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3532 "How often should we fully compact the heap (ignoring the dead " \
3533 "space parameters)") \
3534 range(1, max_uintx) \
3535 \
3536 product(intx, PrintCMSStatistics, 0, \
3537 "Statistics for CMS") \
3538 \
3539 product(bool, PrintCMSInitiationStatistics, false, \
3540 "Statistics for initiating a CMS collection") \
3541 \
3542 product(intx, PrintFLSStatistics, 0, \
3543 "Statistics for CMS' FreeListSpace") \
3544 \
3545 product(intx, PrintFLSCensus, 0, \
3546 "Census for CMS' FreeListSpace") \
3547 \
3548 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3549 "Delay between expansion and allocation (in milliseconds)") \
3550 \
3551 develop(uintx, GCWorkerDelayMillis, 0, \
3552 "Delay in scheduling GC workers (in milliseconds)") \
3553 \
3554 product(intx, DeferThrSuspendLoopCount, 4000, \
3555 "(Unstable) Number of times to iterate in safepoint loop " \
3556 "before blocking VM threads ") \
3557 \
3558 product(intx, DeferPollingPageLoopCount, -1, \
3559 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3560 "before changing safepoint polling page to RO ") \
3561 \
3562 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3563 \
3564 product(bool, PSChunkLargeArrays, true, \
3565 "Process large arrays in chunks") \
3566 \
3567 product(uintx, GCDrainStackTargetSize, 64, \
3568 "Number of entries we will try to leave on the stack " \
3569 "during parallel gc") \
3570 \
3571 /* stack parameters */ \
3572 product_pd(intx, StackYellowPages, \
3573 "Number of yellow zone (recoverable overflows) pages") \
3574 range(1, max_intx) \
3575 \
3576 product_pd(intx, StackRedPages, \
3577 "Number of red zone (unrecoverable overflows) pages") \
3578 range(1, max_intx) \
3579 \
3580 /* greater stack shadow pages can't generate instruction to bang stack */ \
3581 product_pd(intx, StackShadowPages, \
3582 "Number of shadow zone (for overflow checking) pages " \
3583 "this should exceed the depth of the VM and native call stack") \
3584 range(1, 50) \
3585 \
3586 product_pd(intx, ThreadStackSize, \
3587 "Thread Stack Size (in Kbytes)") \
3588 \
3589 product_pd(intx, VMThreadStackSize, \
3590 "Non-Java Thread Stack Size (in Kbytes)") \
3591 \
3592 product_pd(intx, CompilerThreadStackSize, \
3593 "Compiler Thread Stack Size (in Kbytes)") \
3594 \
3595 develop_pd(size_t, JVMInvokeMethodSlack, \
3596 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3597 \
3598 /* code cache parameters */ \
3599 /* ppc64/tiered compilation has large code-entry alignment. */ \
3600 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3601 "Code cache segment size (in bytes) - smallest unit of " \
3602 "allocation") \
3603 range(1, 1024) \
3604 \
3605 develop_pd(intx, CodeEntryAlignment, \
3606 "Code entry alignment for generated code (in bytes)") \
3607 \
3608 product_pd(intx, OptoLoopAlignment, \
3609 "Align inner loops to zero relative to this modulus") \
3610 \
3611 product_pd(uintx, InitialCodeCacheSize, \
3612 "Initial code cache size (in bytes)") \
3613 \
3614 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3615 "Minimum code cache size (in bytes) required to start VM.") \
3616 \
3617 product(bool, SegmentedCodeCache, false, \
3618 "Use a segmented code cache") \
3619 \
3620 product_pd(uintx, ReservedCodeCacheSize, \
3621 "Reserved code cache size (in bytes) - maximum code cache size") \
3622 \
3623 product_pd(uintx, NonProfiledCodeHeapSize, \
3624 "Size of code heap with non-profiled methods (in bytes)") \
3625 \
3626 product_pd(uintx, ProfiledCodeHeapSize, \
3627 "Size of code heap with profiled methods (in bytes)") \
3628 \
3629 product_pd(uintx, NonNMethodCodeHeapSize, \
3630 "Size of code heap with non-nmethods (in bytes)") \
3631 \
3632 product_pd(uintx, CodeCacheExpansionSize, \
3633 "Code cache expansion size (in bytes)") \
3634 \
3635 develop_pd(uintx, CodeCacheMinBlockLength, \
3636 "Minimum number of segments in a code cache block") \
3637 range(1, 100) \
3638 \
3639 notproduct(bool, ExitOnFullCodeCache, false, \
3640 "Exit the VM if we fill the code cache") \
3641 \
3642 product(bool, UseCodeCacheFlushing, true, \
3643 "Remove cold/old nmethods from the code cache") \
3644 \
3645 product(uintx, StartAggressiveSweepingAt, 10, \
3646 "Start aggressive sweeping if X[%] of the code cache is free." \
3647 "Segmented code cache: X[%] of the non-profiled heap." \
3648 "Non-segmented code cache: X[%] of the total code cache") \
3649 range(0, 100) \
3650 \
3651 /* interpreter debugging */ \
3652 develop(intx, BinarySwitchThreshold, 5, \
3653 "Minimal number of lookupswitch entries for rewriting to binary " \
3654 "switch") \
3655 \
3656 develop(intx, StopInterpreterAt, 0, \
3657 "Stop interpreter execution at specified bytecode number") \
3658 \
3659 develop(intx, TraceBytecodesAt, 0, \
3660 "Trace bytecodes starting with specified bytecode number") \
3661 \
3662 /* compiler interface */ \
3663 develop(intx, CIStart, 0, \
3664 "The id of the first compilation to permit") \
3665 \
3666 develop(intx, CIStop, max_jint, \
3667 "The id of the last compilation to permit") \
3668 \
3669 develop(intx, CIStartOSR, 0, \
3670 "The id of the first osr compilation to permit " \
3671 "(CICountOSR must be on)") \
3672 \
3673 develop(intx, CIStopOSR, max_jint, \
3674 "The id of the last osr compilation to permit " \
3675 "(CICountOSR must be on)") \
3676 \
3677 develop(intx, CIBreakAtOSR, -1, \
3678 "The id of osr compilation to break at") \
3679 \
3680 develop(intx, CIBreakAt, -1, \
3681 "The id of compilation to break at") \
3682 \
3683 product(ccstrlist, CompileOnly, "", \
3684 "List of methods (pkg/class.name) to restrict compilation to") \
3685 \
3686 product(ccstr, CompileCommandFile, NULL, \
3687 "Read compiler commands from this file [.hotspot_compiler]") \
3688 \
3689 product(ccstrlist, CompileCommand, "", \
3690 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3691 \
3692 develop(bool, ReplayCompiles, false, \
3693 "Enable replay of compilations from ReplayDataFile") \
3694 \
3695 product(ccstr, ReplayDataFile, NULL, \
3696 "File containing compilation replay information" \
3697 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3698 \
3699 product(ccstr, InlineDataFile, NULL, \
3700 "File containing inlining replay information" \
3701 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3702 \
3703 develop(intx, ReplaySuppressInitializers, 2, \
3704 "Control handling of class initialization during replay: " \
3705 "0 - don't do anything special; " \
3706 "1 - treat all class initializers as empty; " \
3707 "2 - treat class initializers for application classes as empty; " \
3708 "3 - allow all class initializers to run during bootstrap but " \
3709 " pretend they are empty after starting replay") \
3710 range(0, 3) \
3711 \
3712 develop(bool, ReplayIgnoreInitErrors, false, \
3713 "Ignore exceptions thrown during initialization for replay") \
3714 \
3715 product(bool, DumpReplayDataOnError, true, \
3716 "Record replay data for crashing compiler threads") \
3717 \
3718 product(bool, CICompilerCountPerCPU, false, \
3719 "1 compiler thread for log(N CPUs)") \
3720 \
3721 develop(intx, CIFireOOMAt, -1, \
3722 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3723 "(non-negative value throws OOM after this many CI accesses " \
3724 "in each compile)") \
3725 notproduct(intx, CICrashAt, -1, \
3726 "id of compilation to trigger assert in compiler thread for " \
3727 "the purpose of testing, e.g. generation of replay data") \
3728 notproduct(bool, CIObjectFactoryVerify, false, \
3729 "enable potentially expensive verification in ciObjectFactory") \
3730 \
3731 /* Priorities */ \
3732 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3733 \
3734 product(intx, ThreadPriorityPolicy, 0, \
3735 "0 : Normal. "\
3736 " VM chooses priorities that are appropriate for normal "\
3737 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3738 " to normal native priority. Java priorities below " \
3739 " NORM_PRIORITY map to lower native priority values. On "\
3740 " Windows applications are allowed to use higher native "\
3741 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3742 " not use the highest possible native priority, "\
3743 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3744 " system threads. On Linux thread priorities are ignored "\
3745 " because the OS does not support static priority in "\
3746 " SCHED_OTHER scheduling class which is the only choice for "\
3747 " non-root, non-realtime applications. "\
3748 "1 : Aggressive. "\
3749 " Java thread priorities map over to the entire range of "\
3750 " native thread priorities. Higher Java thread priorities map "\
3751 " to higher native thread priorities. This policy should be "\
3752 " used with care, as sometimes it can cause performance "\
3753 " degradation in the application and/or the entire system. On "\
3754 " Linux this policy requires root privilege.") \
3755 range(0, 1) \
3756 \
3757 product(bool, ThreadPriorityVerbose, false, \
3758 "Print priority changes") \
3759 \
3760 product(intx, CompilerThreadPriority, -1, \
3761 "The native priority at which compiler threads should run " \
3762 "(-1 means no change)") \
3763 \
3764 product(intx, VMThreadPriority, -1, \
3765 "The native priority at which the VM thread should run " \
3766 "(-1 means no change)") \
3767 \
3768 product(bool, CompilerThreadHintNoPreempt, true, \
3769 "(Solaris only) Give compiler threads an extra quanta") \
3770 \
3771 product(bool, VMThreadHintNoPreempt, false, \
3772 "(Solaris only) Give VM thread an extra quanta") \
3773 \
3774 product(intx, JavaPriority1_To_OSPriority, -1, \
3775 "Map Java priorities to OS priorities") \
3776 \
3777 product(intx, JavaPriority2_To_OSPriority, -1, \
3778 "Map Java priorities to OS priorities") \
3779 \
3780 product(intx, JavaPriority3_To_OSPriority, -1, \
3781 "Map Java priorities to OS priorities") \
3782 \
3783 product(intx, JavaPriority4_To_OSPriority, -1, \
3784 "Map Java priorities to OS priorities") \
3785 \
3786 product(intx, JavaPriority5_To_OSPriority, -1, \
3787 "Map Java priorities to OS priorities") \
3788 \
3789 product(intx, JavaPriority6_To_OSPriority, -1, \
3790 "Map Java priorities to OS priorities") \
3791 \
3792 product(intx, JavaPriority7_To_OSPriority, -1, \
3793 "Map Java priorities to OS priorities") \
3794 \
3795 product(intx, JavaPriority8_To_OSPriority, -1, \
3796 "Map Java priorities to OS priorities") \
3797 \
3798 product(intx, JavaPriority9_To_OSPriority, -1, \
3799 "Map Java priorities to OS priorities") \
3800 \
3801 product(intx, JavaPriority10_To_OSPriority,-1, \
3802 "Map Java priorities to OS priorities") \
3803 \
3804 experimental(bool, UseCriticalJavaThreadPriority, false, \
3805 "Java thread priority 10 maps to critical scheduling priority") \
3806 \
3807 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3808 "Compiler thread(s) run at critical scheduling priority") \
3809 \
3810 experimental(bool, UseCriticalCMSThreadPriority, false, \
3811 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3812 \
3813 /* compiler debugging */ \
3814 notproduct(intx, CompileTheWorldStartAt, 1, \
3815 "First class to consider when using +CompileTheWorld") \
3816 \
3817 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3818 "Last class to consider when using +CompileTheWorld") \
3819 \
3820 develop(intx, NewCodeParameter, 0, \
3821 "Testing Only: Create a dedicated integer parameter before " \
3822 "putback") \
3823 \
3824 /* new oopmap storage allocation */ \
3825 develop(intx, MinOopMapAllocation, 8, \
3826 "Minimum number of OopMap entries in an OopMapSet") \
3827 \
3828 /* Background Compilation */ \
3829 develop(intx, LongCompileThreshold, 50, \
3830 "Used with +TraceLongCompiles") \
3831 \
3832 /* recompilation */ \
3833 product_pd(intx, CompileThreshold, \
3834 "number of interpreted method invocations before (re-)compiling") \
3835 \
3836 product(double, CompileThresholdScaling, 1.0, \
3837 "Factor to control when first compilation happens " \
3838 "(both with and without tiered compilation): " \
3839 "values greater than 1.0 delay counter overflow, " \
3840 "values between 0 and 1.0 rush counter overflow, " \
3841 "value of 1.0 leaves compilation thresholds unchanged " \
3842 "value of 0.0 is equivalent to -Xint. " \
3843 "" \
3844 "Flag can be set as per-method option. " \
3845 "If a value is specified for a method, compilation thresholds " \
3846 "for that method are scaled by both the value of the global flag "\
3847 "and the value of the per-method flag.") \
3848 \
3849 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3850 "Interpreter (tier 0) invocation notification frequency") \
3851 \
3852 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3853 "C1 without MDO (tier 2) invocation notification frequency") \
3854 \
3855 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3856 "C1 with MDO profiling (tier 3) invocation notification " \
3857 "frequency") \
3858 \
3859 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3860 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3861 \
3862 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3863 "Interpreter (tier 0) invocation notification frequency") \
3864 \
3865 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3866 "C1 without MDO (tier 2) invocation notification frequency") \
3867 \
3868 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3869 "C1 with MDO profiling (tier 3) invocation notification " \
3870 "frequency") \
3871 \
3872 product(intx, Tier2CompileThreshold, 0, \
3873 "threshold at which tier 2 compilation is invoked") \
3874 \
3875 product(intx, Tier2BackEdgeThreshold, 0, \
3876 "Back edge threshold at which tier 2 compilation is invoked") \
3877 \
3878 product(intx, Tier3InvocationThreshold, 200, \
3879 "Compile if number of method invocations crosses this " \
3880 "threshold") \
3881 \
3882 product(intx, Tier3MinInvocationThreshold, 100, \
3883 "Minimum invocation to compile at tier 3") \
3884 \
3885 product(intx, Tier3CompileThreshold, 2000, \
3886 "Threshold at which tier 3 compilation is invoked (invocation " \
3887 "minimum must be satisfied") \
3888 \
3889 product(intx, Tier3BackEdgeThreshold, 60000, \
3890 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3891 \
3892 product(intx, Tier4InvocationThreshold, 5000, \
3893 "Compile if number of method invocations crosses this " \
3894 "threshold") \
3895 \
3896 product(intx, Tier4MinInvocationThreshold, 600, \
3897 "Minimum invocation to compile at tier 4") \
3898 \
3899 product(intx, Tier4CompileThreshold, 15000, \
3900 "Threshold at which tier 4 compilation is invoked (invocation " \
3901 "minimum must be satisfied") \
3902 \
3903 product(intx, Tier4BackEdgeThreshold, 40000, \
3904 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3905 \
3906 product(intx, Tier3DelayOn, 5, \
3907 "If C2 queue size grows over this amount per compiler thread " \
3908 "stop compiling at tier 3 and start compiling at tier 2") \
3909 \
3910 product(intx, Tier3DelayOff, 2, \
3911 "If C2 queue size is less than this amount per compiler thread " \
3912 "allow methods compiled at tier 2 transition to tier 3") \
3913 \
3914 product(intx, Tier3LoadFeedback, 5, \
3915 "Tier 3 thresholds will increase twofold when C1 queue size " \
3916 "reaches this amount per compiler thread") \
3917 \
3918 product(intx, Tier4LoadFeedback, 3, \
3919 "Tier 4 thresholds will increase twofold when C2 queue size " \
3920 "reaches this amount per compiler thread") \
3921 \
3922 product(intx, TieredCompileTaskTimeout, 50, \
3923 "Kill compile task if method was not used within " \
3924 "given timeout in milliseconds") \
3925 \
3926 product(intx, TieredStopAtLevel, 4, \
3927 "Stop at given compilation level") \
3928 \
3929 product(intx, Tier0ProfilingStartPercentage, 200, \
3930 "Start profiling in interpreter if the counters exceed tier 3 " \
3931 "thresholds by the specified percentage") \
3932 \
3933 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3934 "Increase the compile threshold for C1 compilation if the code " \
3935 "cache is filled by the specified percentage") \
3936 range(0, 99) \
3937 \
3938 product(intx, TieredRateUpdateMinTime, 1, \
3939 "Minimum rate sampling interval (in milliseconds)") \
3940 \
3941 product(intx, TieredRateUpdateMaxTime, 25, \
3942 "Maximum rate sampling interval (in milliseconds)") \
3943 \
3944 product_pd(bool, TieredCompilation, \
3945 "Enable tiered compilation") \
3946 \
3947 product(bool, PrintTieredEvents, false, \
3948 "Print tiered events notifications") \
3949 \
3950 product_pd(intx, OnStackReplacePercentage, \
3951 "NON_TIERED number of method invocations/branches (expressed as " \
3952 "% of CompileThreshold) before (re-)compiling OSR code") \
3953 \
3954 product(intx, InterpreterProfilePercentage, 33, \
3955 "NON_TIERED number of method invocations/branches (expressed as " \
3956 "% of CompileThreshold) before profiling in the interpreter") \
3957 range(0, 100) \
3958 \
3959 develop(intx, MaxRecompilationSearchLength, 10, \
3960 "The maximum number of frames to inspect when searching for " \
3961 "recompilee") \
3962 \
3963 develop(intx, MaxInterpretedSearchLength, 3, \
3964 "The maximum number of interpreted frames to skip when searching "\
3965 "for recompilee") \
3966 \
3967 develop(intx, DesiredMethodLimit, 8000, \
3968 "The desired maximum method size (in bytecodes) after inlining") \
3969 \
3970 develop(intx, HugeMethodLimit, 8000, \
3971 "Don't compile methods larger than this if " \
3972 "+DontCompileHugeMethods") \
3973 \
3974 /* New JDK 1.4 reflection implementation */ \
3975 \
3976 develop(intx, FastSuperclassLimit, 8, \
3977 "Depth of hardwired instanceof accelerator array") \
3978 \
3979 /* Properties for Java libraries */ \
3980 \
3981 product(size_t, MaxDirectMemorySize, 0, \
3982 "Maximum total size of NIO direct-buffer allocations") \
3983 \
3984 /* Flags used for temporary code during development */ \
3985 \
3986 diagnostic(bool, UseNewCode, false, \
3987 "Testing Only: Use the new version while testing") \
3988 \
3989 diagnostic(bool, UseNewCode2, false, \
3990 "Testing Only: Use the new version while testing") \
3991 \
3992 diagnostic(bool, UseNewCode3, false, \
3993 "Testing Only: Use the new version while testing") \
3994 \
3995 /* flags for performance data collection */ \
3996 \
3997 product(bool, UsePerfData, falseInEmbedded, \
3998 "Flag to disable jvmstat instrumentation for performance testing "\
3999 "and problem isolation purposes") \
4000 \
4001 product(bool, PerfDataSaveToFile, false, \
4002 "Save PerfData memory to hsperfdata_<pid> file on exit") \
4003 \
4004 product(ccstr, PerfDataSaveFile, NULL, \
4005 "Save PerfData memory to the specified absolute pathname. " \
4006 "The string %p in the file name (if present) " \
4007 "will be replaced by pid") \
4008 \
4009 product(intx, PerfDataSamplingInterval, 50, \
4010 "Data sampling interval (in milliseconds)") \
4011 \
4012 develop(bool, PerfTraceDataCreation, false, \
4013 "Trace creation of Performance Data Entries") \
4014 \
4015 develop(bool, PerfTraceMemOps, false, \
4016 "Trace PerfMemory create/attach/detach calls") \
4017 \
4018 product(bool, PerfDisableSharedMem, false, \
4019 "Store performance data in standard memory") \
4020 \
4021 product(intx, PerfDataMemorySize, 64*K, \
4022 "Size of performance data memory region. Will be rounded " \
4023 "up to a multiple of the native os page size.") \
4024 \
4025 product(intx, PerfMaxStringConstLength, 1024, \
4026 "Maximum PerfStringConstant string length before truncation") \
4027 \
4028 product(bool, PerfAllowAtExitRegistration, false, \
4029 "Allow registration of atexit() methods") \
4030 \
4031 product(bool, PerfBypassFileSystemCheck, false, \
4032 "Bypass Win32 file system criteria checks (Windows Only)") \
4033 \
4034 product(intx, UnguardOnExecutionViolation, 0, \
4035 "Unguard page and retry on no-execute fault (Win32 only) " \
4036 "0=off, 1=conservative, 2=aggressive") \
4037 range(0, 2) \
4038 \
4039 /* Serviceability Support */ \
4040 \
4041 product(bool, ManagementServer, false, \
4042 "Create JMX Management Server") \
4043 \
4044 product(bool, DisableAttachMechanism, false, \
4045 "Disable mechanism that allows tools to attach to this VM") \
4046 \
4047 product(bool, StartAttachListener, false, \
4048 "Always start Attach Listener at VM startup") \
4049 \
4050 manageable(bool, PrintConcurrentLocks, false, \
4051 "Print java.util.concurrent locks in thread dump") \
4052 \
4053 product(bool, TransmitErrorReport, false, \
4054 "Enable error report transmission on erroneous termination") \
4055 \
4056 product(ccstr, ErrorReportServer, NULL, \
4057 "Override built-in error report server address") \
4058 \
4059 /* Shared spaces */ \
4060 \
4061 product(bool, UseSharedSpaces, true, \
4062 "Use shared spaces for metadata") \
4063 \
4064 product(bool, VerifySharedSpaces, false, \
4065 "Verify shared spaces (false for default archive, true for " \
4066 "archive specified by -XX:SharedArchiveFile)") \
4067 \
4068 product(bool, RequireSharedSpaces, false, \
4069 "Require shared spaces for metadata") \
4070 \
4071 product(bool, DumpSharedSpaces, false, \
4072 "Special mode: JVM reads a class list, loads classes, builds " \
4073 "shared spaces, and dumps the shared spaces to a file to be " \
4074 "used in future JVM runs") \
4075 \
4076 product(bool, PrintSharedSpaces, false, \
4077 "Print usage of shared spaces") \
4078 \
4079 product(bool, PrintSharedArchiveAndExit, false, \
4080 "Print shared archive file contents") \
4081 \
4082 product(bool, PrintSharedDictionary, false, \
4083 "If PrintSharedArchiveAndExit is true, also print the shared " \
4084 "dictionary") \
4085 \
4086 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4087 "Size of read-write space for metadata (in bytes)") \
4088 \
4089 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4090 "Size of read-only space for metadata (in bytes)") \
4091 \
4092 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
4093 "Size of the shared miscellaneous data area (in bytes)") \
4094 \
4095 product(uintx, SharedMiscCodeSize, 120*K, \
4096 "Size of the shared miscellaneous code area (in bytes)") \
4097 \
4098 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
4099 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4100 "Address to allocate shared memory region for class data") \
4101 \
4102 product(uintx, SharedSymbolTableBucketSize, 4, \
4103 "Average number of symbols per bucket in shared table") \
4104 \
4105 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4106 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4107 "classes. Just exclude them from the shared dictionary.") \
4108 \
4109 diagnostic(bool, PrintMethodHandleStubs, false, \
4110 "Print generated stub code for method handles") \
4111 \
4112 develop(bool, TraceMethodHandles, false, \
4113 "trace internal method handle operations") \
4114 \
4115 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4116 "perform extra checks when constructing method handles") \
4117 \
4118 diagnostic(bool, ShowHiddenFrames, false, \
4119 "show method handle implementation frames (usually hidden)") \
4120 \
4121 experimental(bool, TrustFinalNonStaticFields, false, \
4122 "trust final non-static declarations for constant folding") \
4123 \
4124 diagnostic(bool, FoldStableValues, true, \
4125 "Optimize loads from stable fields (marked w/ @Stable)") \
4126 \
4127 develop(bool, TraceInvokeDynamic, false, \
4128 "trace internal invoke dynamic operations") \
4129 \
4130 diagnostic(bool, PauseAtStartup, false, \
4131 "Causes the VM to pause at startup time and wait for the pause " \
4132 "file to be removed (default: ./vm.paused.<pid>)") \
4133 \
4134 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4135 "The file to create and for whose removal to await when pausing " \
4136 "at startup. (default: ./vm.paused.<pid>)") \
4137 \
4138 diagnostic(bool, PauseAtExit, false, \
4139 "Pause and wait for keypress on exit if a debugger is attached") \
4140 \
4141 product(bool, ExtendedDTraceProbes, false, \
4142 "Enable performance-impacting dtrace probes") \
4143 \
4144 product(bool, DTraceMethodProbes, false, \
4145 "Enable dtrace probes for method-entry and method-exit") \
4146 \
4147 product(bool, DTraceAllocProbes, false, \
4148 "Enable dtrace probes for object allocation") \
4149 \
4150 product(bool, DTraceMonitorProbes, false, \
4151 "Enable dtrace probes for monitor events") \
4152 \
4153 product(bool, RelaxAccessControlCheck, false, \
4154 "Relax the access control checks in the verifier") \
4155 \
4156 product(uintx, StringTableSize, defaultStringTableSize, \
4157 "Number of buckets in the interned String table") \
4158 range(minimumStringTableSize, 111*defaultStringTableSize) \
4159 \
4160 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4161 "Number of buckets in the JVM internal Symbol table") \
4162 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4163 \
4164 product(bool, UseStringDeduplication, false, \
4165 "Use string deduplication") \
4166 \
4167 product(bool, PrintStringDeduplicationStatistics, false, \
4168 "Print string deduplication statistics") \
4169 \
4170 product(uintx, StringDeduplicationAgeThreshold, 3, \
4171 "A string must reach this age (or be promoted to an old region) " \
4172 "to be considered for deduplication") \
4173 range(1, markOopDesc::max_age) \
4174 \
4175 diagnostic(bool, StringDeduplicationResizeALot, false, \
4176 "Force table resize every time the table is scanned") \
4177 \
4178 diagnostic(bool, StringDeduplicationRehashALot, false, \
4179 "Force table rehash every time the table is scanned") \
4180 \
4181 develop(bool, TraceDefaultMethods, false, \
4182 "Trace the default method processing steps") \
4183 \
4184 diagnostic(bool, WhiteBoxAPI, false, \
4185 "Enable internal testing APIs") \
4186 \
4187 product(bool, PrintGCCause, true, \
4188 "Include GC cause in GC logging") \
4189 \
4190 experimental(intx, SurvivorAlignmentInBytes, 0, \
4191 "Default survivor space alignment in bytes") \
4192 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4193 \
4194 product(bool , AllowNonVirtualCalls, false, \
4195 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4196 \
4197 product(ccstr, DumpLoadedClassList, NULL, \
4198 "Dump the names all loaded classes, that could be stored into " \
4199 "the CDS archive, in the specified file") \
4200 \
4201 product(ccstr, SharedClassListFile, NULL, \
4202 "Override the default CDS class list") \
4203 \
4204 diagnostic(ccstr, SharedArchiveFile, NULL, \
4205 "Override the default location of the CDS archive file") \
4206 \
4207 product(ccstr, ExtraSharedClassListFile, NULL, \
4208 "Extra classlist for building the CDS archive file") \
4209 \
4210 experimental(size_t, ArrayAllocatorMallocLimit, \
4211 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4212 "Allocation less than this value will be allocated " \
4213 "using malloc. Larger allocations will use mmap.") \
4214 \
4215 experimental(bool, AlwaysAtomicAccesses, false, \
4216 "Accesses to all variables should always be atomic") \
4217 \
4218 product(bool, EnableTracing, false, \
4219 "Enable event-based tracing") \
4220 \
4221 product(bool, UseLockedTracing, false, \
4222 "Use locked-tracing when doing event-based tracing") \
4223 \
4224 diagnostic(bool, UseUnalignedAccesses, false, \
4225 "Use unaligned memory accesses in sun.misc.Unsafe") \
4226 \
4227 product_pd(bool, PreserveFramePointer, \
4228 "Use the FP register for holding the frame pointer " \
4229 "and not as a general purpose register.") \
4230 \
4231 diagnostic(bool, CheckIntrinsics, true, \
4232 "When a class C is loaded, check that " \
4233 "(1) all intrinsics defined by the VM for class C are present "\
4234 "in the loaded class file and are marked with the " \
4235 "@HotSpotIntrinsicCandidate annotation, that " \
4236 "(2) there is an intrinsic registered for all loaded methods " \
4237 "that are annotated with the @HotSpotIntrinsicCandidate " \
4238 "annotation, and that " \
4239 "(3) no orphan methods exist for class C (i.e., methods for " \
4240 "which the VM declares an intrinsic but that are not declared "\
4241 "in the loaded class C. " \
4242 "Check (3) is available only in debug builds.")
4243
4244 /*
4245 * Macros for factoring of globals
4246 */
4247
4248 // Interface macros
4249 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4250 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4251 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4252 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4253 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4254 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4255 #ifdef PRODUCT
4256 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4257 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4258 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4259 #else
4260 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4261 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4262 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4263 #endif // PRODUCT
4264 // Special LP64 flags, product only needed for now.
4265 #ifdef _LP64
4266 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4267 #else
4268 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4269 #endif // _LP64
4270
4271 // Implementation macros
4272 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4273 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4274 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4275 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4276 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4277 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4278 #ifdef PRODUCT
4279 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4280 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4281 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4282 #else
4283 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4284 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4285 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4286 #endif // PRODUCT
4287 #ifdef _LP64
4288 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4289 #else
4290 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4291 #endif // _LP64
4292
4293 // Only materialize src code for range checking when required, ignore otherwise
4294 #define IGNORE_RANGE(a, b)
4295 // Only materialize src code for contraint checking when required, ignore otherwise
4296 #define IGNORE_CONSTRAINT(func,type)
4297
4298 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4299 DECLARE_PD_DEVELOPER_FLAG, \
4300 DECLARE_PRODUCT_FLAG, \
4301 DECLARE_PD_PRODUCT_FLAG, \
4302 DECLARE_DIAGNOSTIC_FLAG, \
4303 DECLARE_EXPERIMENTAL_FLAG, \
4304 DECLARE_NOTPRODUCT_FLAG, \
4305 DECLARE_MANAGEABLE_FLAG, \
4306 DECLARE_PRODUCT_RW_FLAG, \
4307 DECLARE_LP64_PRODUCT_FLAG, \
4308 IGNORE_RANGE, \
4309 IGNORE_CONSTRAINT)
4310
4311 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4312 DECLARE_PD_DEVELOPER_FLAG, \
4313 DECLARE_PRODUCT_FLAG, \
4314 DECLARE_PD_PRODUCT_FLAG, \
4315 DECLARE_DIAGNOSTIC_FLAG, \
4316 DECLARE_NOTPRODUCT_FLAG, \
4317 IGNORE_RANGE, \
4318 IGNORE_CONSTRAINT)
4319
4320 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4321 DECLARE_PRODUCT_FLAG, \
4322 DECLARE_DIAGNOSTIC_FLAG, \
4323 DECLARE_EXPERIMENTAL_FLAG, \
4324 DECLARE_NOTPRODUCT_FLAG, \
4325 IGNORE_RANGE, \
4326 IGNORE_CONSTRAINT)
4327
4328 // Extensions
4329
4330 #include "runtime/globals_ext.hpp"
4331
4332 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP