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, UseMallocOnly, false, \
941 "Use only malloc/free for allocation (no resource area/arena)") \
942 \
943 develop(bool, PrintMalloc, false, \
944 "Print all malloc/free calls") \
945 \
946 develop(bool, PrintMallocStatistics, false, \
947 "Print malloc/free statistics") \
948 \
949 develop(bool, ZapResourceArea, trueInDebug, \
950 "Zap freed resource/arena space with 0xABABABAB") \
951 \
952 notproduct(bool, ZapVMHandleArea, trueInDebug, \
953 "Zap freed VM handle space with 0xBCBCBCBC") \
954 \
955 develop(bool, ZapJNIHandleArea, trueInDebug, \
956 "Zap freed JNI handle space with 0xFEFEFEFE") \
957 \
958 notproduct(bool, ZapStackSegments, trueInDebug, \
959 "Zap allocated/freed stack segments with 0xFADFADED") \
960 \
961 develop(bool, ZapUnusedHeapArea, trueInDebug, \
962 "Zap unused heap space with 0xBAADBABE") \
963 \
964 develop(bool, TraceZapUnusedHeapArea, false, \
965 "Trace zapping of unused heap space") \
966 \
967 develop(bool, CheckZapUnusedHeapArea, false, \
968 "Check zapping of unused heap space") \
969 \
970 develop(bool, ZapFillerObjects, trueInDebug, \
971 "Zap filler objects with 0xDEAFBABE") \
972 \
973 develop(bool, PrintVMMessages, true, \
974 "Print VM messages on console") \
975 \
976 product(bool, PrintGCApplicationConcurrentTime, false, \
977 "Print the time the application has been running") \
978 \
979 product(bool, PrintGCApplicationStoppedTime, false, \
980 "Print the time the application has been stopped") \
981 \
982 diagnostic(bool, VerboseVerification, false, \
983 "Display detailed verification details") \
984 \
985 notproduct(uintx, ErrorHandlerTest, 0, \
986 "If > 0, provokes an error after VM initialization; the value " \
987 "determines which error to provoke. See test_error_handler() " \
988 "in debug.cpp.") \
989 \
990 notproduct(uintx, TestCrashInErrorHandler, 0, \
991 "If > 0, provokes an error inside VM error handler (a secondary " \
992 "crash). see test_error_handler() in debug.cpp.") \
993 \
994 notproduct(bool, TestSafeFetchInErrorHandler, false, \
995 "If true, tests SafeFetch inside error handler.") \
996 \
997 develop(bool, Verbose, false, \
998 "Print additional debugging information from other modes") \
999 \
1000 develop(bool, PrintMiscellaneous, false, \
1001 "Print uncategorized debugging information (requires +Verbose)") \
1002 \
1003 develop(bool, WizardMode, false, \
1004 "Print much more debugging information") \
1005 \
1006 product(bool, ShowMessageBoxOnError, false, \
1007 "Keep process alive on VM fatal error") \
1008 \
1009 product(bool, CreateCoredumpOnCrash, true, \
1010 "Create core/mini dump on VM fatal error") \
1011 \
1012 product(uintx, ErrorLogTimeout, 2 * 60, \
1013 "Timeout, in seconds, to limit the time spent on writing an " \
1014 "error log in case of a crash.") \
1015 \
1016 product_pd(bool, UseOSErrorReporting, \
1017 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1018 \
1019 product(bool, SuppressFatalErrorMessage, false, \
1020 "Report NO fatal error message (avoid deadlock)") \
1021 \
1022 product(ccstrlist, OnError, "", \
1023 "Run user-defined commands on fatal error; see VMError.cpp " \
1024 "for examples") \
1025 \
1026 product(ccstrlist, OnOutOfMemoryError, "", \
1027 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1028 \
1029 manageable(bool, HeapDumpBeforeFullGC, false, \
1030 "Dump heap to file before any major stop-the-world GC") \
1031 \
1032 manageable(bool, HeapDumpAfterFullGC, false, \
1033 "Dump heap to file after any major stop-the-world GC") \
1034 \
1035 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1036 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1037 \
1038 manageable(ccstr, HeapDumpPath, NULL, \
1039 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1040 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1041 "in the working directory)") \
1042 \
1043 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1044 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1045 "when the heap usage is larger than this") \
1046 \
1047 develop(size_t, HeapDumpSegmentSize, 1*G, \
1048 "Approximate segment size when generating a segmented heap dump") \
1049 \
1050 develop(bool, BreakAtWarning, false, \
1051 "Execute breakpoint upon encountering VM warning") \
1052 \
1053 develop(bool, TraceVMOperation, false, \
1054 "Trace VM operations") \
1055 \
1056 develop(bool, UseFakeTimers, false, \
1057 "Tell whether the VM should use system time or a fake timer") \
1058 \
1059 product(ccstr, NativeMemoryTracking, "off", \
1060 "Native memory tracking options") \
1061 \
1062 diagnostic(bool, PrintNMTStatistics, false, \
1063 "Print native memory tracking summary data if it is on") \
1064 \
1065 diagnostic(bool, LogCompilation, false, \
1066 "Log compilation activity in detail to LogFile") \
1067 \
1068 product(bool, PrintCompilation, false, \
1069 "Print compilations") \
1070 \
1071 diagnostic(bool, TraceNMethodInstalls, false, \
1072 "Trace nmethod installation") \
1073 \
1074 diagnostic(intx, ScavengeRootsInCode, 2, \
1075 "0: do not allow scavengable oops in the code cache; " \
1076 "1: allow scavenging from the code cache; " \
1077 "2: emit as many constants as the compiler can see") \
1078 range(0, 2) \
1079 \
1080 product(bool, AlwaysRestoreFPU, false, \
1081 "Restore the FPU control word after every JNI call (expensive)") \
1082 \
1083 diagnostic(bool, PrintCompilation2, false, \
1084 "Print additional statistics per compilation") \
1085 \
1086 diagnostic(bool, PrintAdapterHandlers, false, \
1087 "Print code generated for i2c/c2i adapters") \
1088 \
1089 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1090 "Verify that i2c/c2i adapters are called properly") \
1091 \
1092 develop(bool, VerifyAdapterSharing, false, \
1093 "Verify that the code for shared adapters is the equivalent") \
1094 \
1095 diagnostic(bool, PrintAssembly, false, \
1096 "Print assembly code (using external disassembler.so)") \
1097 \
1098 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1099 "Print options string passed to disassembler.so") \
1100 \
1101 diagnostic(bool, PrintNMethods, false, \
1102 "Print assembly code for nmethods when generated") \
1103 \
1104 diagnostic(bool, PrintNativeNMethods, false, \
1105 "Print assembly code for native nmethods when generated") \
1106 \
1107 develop(bool, PrintDebugInfo, false, \
1108 "Print debug information for all nmethods when generated") \
1109 \
1110 develop(bool, PrintRelocations, false, \
1111 "Print relocation information for all nmethods when generated") \
1112 \
1113 develop(bool, PrintDependencies, false, \
1114 "Print dependency information for all nmethods when generated") \
1115 \
1116 develop(bool, PrintExceptionHandlers, false, \
1117 "Print exception handler tables for all nmethods when generated") \
1118 \
1119 develop(bool, StressCompiledExceptionHandlers, false, \
1120 "Exercise compiled exception handlers") \
1121 \
1122 develop(bool, InterceptOSException, false, \
1123 "Start debugger when an implicit OS (e.g. NULL) " \
1124 "exception happens") \
1125 \
1126 product(bool, PrintCodeCache, false, \
1127 "Print the code cache memory usage when exiting") \
1128 \
1129 develop(bool, PrintCodeCache2, false, \
1130 "Print detailed usage information on the code cache when exiting")\
1131 \
1132 product(bool, PrintCodeCacheOnCompilation, false, \
1133 "Print the code cache memory usage each time a method is " \
1134 "compiled") \
1135 \
1136 diagnostic(bool, PrintStubCode, false, \
1137 "Print generated stub code") \
1138 \
1139 product(bool, StackTraceInThrowable, true, \
1140 "Collect backtrace in throwable when exception happens") \
1141 \
1142 product(bool, OmitStackTraceInFastThrow, true, \
1143 "Omit backtraces for some 'hot' exceptions in optimized code") \
1144 \
1145 product(bool, ProfilerPrintByteCodeStatistics, false, \
1146 "Print bytecode statistics when dumping profiler output") \
1147 \
1148 product(bool, ProfilerRecordPC, false, \
1149 "Collect ticks for each 16 byte interval of compiled code") \
1150 \
1151 product(bool, ProfileVM, false, \
1152 "Profile ticks that fall within VM (either in the VM Thread " \
1153 "or VM code called through stubs)") \
1154 \
1155 product(bool, ProfileIntervals, false, \
1156 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1157 \
1158 notproduct(bool, ProfilerCheckIntervals, false, \
1159 "Collect and print information on spacing of profiler ticks") \
1160 \
1161 product(bool, PrintWarnings, true, \
1162 "Print JVM warnings to output stream") \
1163 \
1164 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1165 "Print warnings for stalled SpinLocks") \
1166 \
1167 product(bool, RegisterFinalizersAtInit, true, \
1168 "Register finalizable objects at end of Object.<init> or " \
1169 "after allocation") \
1170 \
1171 develop(bool, RegisterReferences, true, \
1172 "Tell whether the VM should register soft/weak/final/phantom " \
1173 "references") \
1174 \
1175 develop(bool, IgnoreRewrites, false, \
1176 "Suppress rewrites of bytecodes in the oopmap generator. " \
1177 "This is unsafe!") \
1178 \
1179 develop(bool, PrintCodeCacheExtension, false, \
1180 "Print extension of code cache") \
1181 \
1182 develop(bool, UsePrivilegedStack, true, \
1183 "Enable the security JVM functions") \
1184 \
1185 develop(bool, ProtectionDomainVerification, true, \
1186 "Verify protection domain before resolution in system dictionary")\
1187 \
1188 product(bool, ClassUnloading, true, \
1189 "Do unloading of classes") \
1190 \
1191 product(bool, ClassUnloadingWithConcurrentMark, true, \
1192 "Do unloading of classes with a concurrent marking cycle") \
1193 \
1194 develop(bool, DisableStartThread, false, \
1195 "Disable starting of additional Java threads " \
1196 "(for debugging only)") \
1197 \
1198 develop(bool, MemProfiling, false, \
1199 "Write memory usage profiling to log file") \
1200 \
1201 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1202 "Print the system dictionary at exit") \
1203 \
1204 experimental(intx, PredictedLoadedClassCount, 0, \
1205 "Experimental: Tune loaded class cache starting size") \
1206 \
1207 diagnostic(bool, UnsyncloadClass, false, \
1208 "Unstable: VM calls loadClass unsynchronized. Custom " \
1209 "class loader must call VM synchronized for findClass " \
1210 "and defineClass.") \
1211 \
1212 product(bool, AlwaysLockClassLoader, false, \
1213 "Require the VM to acquire the class loader lock before calling " \
1214 "loadClass() even for class loaders registering " \
1215 "as parallel capable") \
1216 \
1217 product(bool, AllowParallelDefineClass, false, \
1218 "Allow parallel defineClass requests for class loaders " \
1219 "registering as parallel capable") \
1220 \
1221 product(bool, MustCallLoadClassInternal, false, \
1222 "Call loadClassInternal() rather than loadClass()") \
1223 \
1224 product_pd(bool, DontYieldALot, \
1225 "Throw away obvious excess yield calls") \
1226 \
1227 product_pd(bool, ConvertSleepToYield, \
1228 "Convert sleep(0) to thread yield " \
1229 "(may be off for Solaris to improve GUI)") \
1230 \
1231 product(bool, ConvertYieldToSleep, false, \
1232 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1233 "behavior") \
1234 \
1235 develop(bool, UseDetachedThreads, true, \
1236 "Use detached threads that are recycled upon termination " \
1237 "(for Solaris only)") \
1238 \
1239 product(bool, UseLWPSynchronization, true, \
1240 "Use LWP-based instead of libthread-based synchronization " \
1241 "(SPARC only)") \
1242 \
1243 experimental(ccstr, SyncKnobs, NULL, \
1244 "(Unstable) Various monitor synchronization tunables") \
1245 \
1246 experimental(intx, EmitSync, 0, \
1247 "(Unsafe, Unstable) " \
1248 "Control emission of inline sync fast-path code") \
1249 \
1250 product(intx, MonitorBound, 0, "Bound Monitor population") \
1251 \
1252 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1253 \
1254 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1255 "Experimental Sync flags") \
1256 \
1257 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1258 \
1259 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1260 \
1261 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1262 \
1263 experimental(intx, hashCode, 5, \
1264 "(Unstable) select hashCode generation algorithm") \
1265 \
1266 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1267 "(Unstable, Linux-specific) " \
1268 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1269 \
1270 product(bool, FilterSpuriousWakeups, true, \
1271 "When true prevents OS-level spurious, or premature, wakeups " \
1272 "from Object.wait (Ignored for Windows)") \
1273 \
1274 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1275 \
1276 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1277 \
1278 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1279 \
1280 develop(bool, UsePthreads, false, \
1281 "Use pthread-based instead of libthread-based synchronization " \
1282 "(SPARC only)") \
1283 \
1284 product(bool, ReduceSignalUsage, false, \
1285 "Reduce the use of OS signals in Java and/or the VM") \
1286 \
1287 develop_pd(bool, ShareVtableStubs, \
1288 "Share vtable stubs (smaller code but worse branch prediction") \
1289 \
1290 develop(bool, LoadLineNumberTables, true, \
1291 "Tell whether the class file parser loads line number tables") \
1292 \
1293 develop(bool, LoadLocalVariableTables, true, \
1294 "Tell whether the class file parser loads local variable tables") \
1295 \
1296 develop(bool, LoadLocalVariableTypeTables, true, \
1297 "Tell whether the class file parser loads local variable type" \
1298 "tables") \
1299 \
1300 product(bool, AllowUserSignalHandlers, false, \
1301 "Do not complain if the application installs signal handlers " \
1302 "(Solaris & Linux only)") \
1303 \
1304 product(bool, UseSignalChaining, true, \
1305 "Use signal-chaining to invoke signal handlers installed " \
1306 "by the application (Solaris & Linux only)") \
1307 \
1308 product(bool, UseAltSigs, false, \
1309 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1310 "internal signals (Solaris only)") \
1311 \
1312 product(bool, AllowJNIEnvProxy, false, \
1313 "Allow JNIEnv proxies for jdbx") \
1314 \
1315 product(bool, JNIDetachReleasesMonitors, true, \
1316 "JNI DetachCurrentThread releases monitors owned by thread") \
1317 \
1318 product(bool, RestoreMXCSROnJNICalls, false, \
1319 "Restore MXCSR when returning from JNI calls") \
1320 \
1321 product(bool, CheckJNICalls, false, \
1322 "Verify all arguments to JNI calls") \
1323 \
1324 product(bool, CheckEndorsedAndExtDirs, false, \
1325 "Verify the endorsed and extension directories are not used") \
1326 \
1327 product(bool, UseFastJNIAccessors, true, \
1328 "Use optimized versions of Get<Primitive>Field") \
1329 \
1330 product(intx, MaxJNILocalCapacity, 65536, \
1331 "Maximum allowable local JNI handle capacity to " \
1332 "EnsureLocalCapacity() and PushLocalFrame(), " \
1333 "where <= 0 is unlimited, default: 65536") \
1334 \
1335 product(bool, EagerXrunInit, false, \
1336 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1337 "but not all -Xrun libraries may support the state of the VM " \
1338 "at this time") \
1339 \
1340 product(bool, PreserveAllAnnotations, false, \
1341 "Preserve RuntimeInvisibleAnnotations as well " \
1342 "as RuntimeVisibleAnnotations") \
1343 \
1344 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1345 "Number of OutOfMemoryErrors preallocated with backtrace") \
1346 \
1347 product(bool, UseXMMForArrayCopy, false, \
1348 "Use SSE2 MOVQ instruction for Arraycopy") \
1349 \
1350 product(intx, FieldsAllocationStyle, 1, \
1351 "0 - type based with oops first, " \
1352 "1 - with oops last, " \
1353 "2 - oops in super and sub classes are together") \
1354 range(0, 2) \
1355 \
1356 product(bool, CompactFields, true, \
1357 "Allocate nonstatic fields in gaps between previous fields") \
1358 \
1359 notproduct(bool, PrintFieldLayout, false, \
1360 "Print field layout for each class") \
1361 \
1362 /* Need to limit the extent of the padding to reasonable size. */\
1363 /* 8K is well beyond the reasonable HW cache line size, even with */\
1364 /* aggressive prefetching, while still leaving the room for segregating */\
1365 /* among the distinct pages. */\
1366 product(intx, ContendedPaddingWidth, 128, \
1367 "How many bytes to pad the fields/classes marked @Contended with")\
1368 range(0, 8192) \
1369 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \
1370 \
1371 product(bool, EnableContended, true, \
1372 "Enable @Contended annotation support") \
1373 \
1374 product(bool, RestrictContended, true, \
1375 "Restrict @Contended to trusted classes") \
1376 \
1377 product(bool, UseBiasedLocking, true, \
1378 "Enable biased locking in JVM") \
1379 \
1380 product(intx, BiasedLockingStartupDelay, 4000, \
1381 "Number of milliseconds to wait before enabling biased locking") \
1382 \
1383 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1384 "Print statistics of biased locking in JVM") \
1385 \
1386 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1387 "Threshold of number of revocations per type to try to " \
1388 "rebias all objects in the heap of that type") \
1389 \
1390 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1391 "Threshold of number of revocations per type to permanently " \
1392 "revoke biases of all objects in the heap of that type") \
1393 \
1394 product(intx, BiasedLockingDecayTime, 25000, \
1395 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1396 "type after previous bulk rebias") \
1397 \
1398 /* tracing */ \
1399 \
1400 notproduct(bool, TraceRuntimeCalls, false, \
1401 "Trace run-time calls") \
1402 \
1403 develop(bool, TraceJNICalls, false, \
1404 "Trace JNI calls") \
1405 \
1406 develop(bool, StressRewriter, false, \
1407 "Stress linktime bytecode rewriting") \
1408 \
1409 notproduct(bool, TraceJVMCalls, false, \
1410 "Trace JVM calls") \
1411 \
1412 product(ccstr, TraceJVMTI, NULL, \
1413 "Trace flags for JVMTI functions and events") \
1414 \
1415 /* This option can change an EMCP method into an obsolete method. */ \
1416 /* This can affect tests that except specific methods to be EMCP. */ \
1417 /* This option should be used with caution. */ \
1418 product(bool, StressLdcRewrite, false, \
1419 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1420 \
1421 product(intx, TraceRedefineClasses, 0, \
1422 "Trace level for JVMTI RedefineClasses") \
1423 \
1424 /* change to false by default sometime after Mustang */ \
1425 product(bool, VerifyMergedCPBytecodes, true, \
1426 "Verify bytecodes after RedefineClasses constant pool merging") \
1427 \
1428 develop(bool, TraceJNIHandleAllocation, false, \
1429 "Trace allocation/deallocation of JNI handle blocks") \
1430 \
1431 develop(bool, TraceBytecodes, false, \
1432 "Trace bytecode execution") \
1433 \
1434 develop(bool, TraceClassInitialization, false, \
1435 "Trace class initialization") \
1436 \
1437 product(bool, TraceExceptions, false, \
1438 "Trace exceptions") \
1439 \
1440 develop(bool, TraceICs, false, \
1441 "Trace inline cache changes") \
1442 \
1443 notproduct(bool, TraceInvocationCounterOverflow, false, \
1444 "Trace method invocation counter overflow") \
1445 \
1446 develop(bool, TraceInlineCacheClearing, false, \
1447 "Trace clearing of inline caches in nmethods") \
1448 \
1449 develop(bool, TraceDependencies, false, \
1450 "Trace dependencies") \
1451 \
1452 develop(bool, VerifyDependencies, trueInDebug, \
1453 "Exercise and verify the compilation dependency mechanism") \
1454 \
1455 develop(bool, TraceNewOopMapGeneration, false, \
1456 "Trace OopMapGeneration") \
1457 \
1458 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1459 "Trace OopMapGeneration: print detailed cell states") \
1460 \
1461 develop(bool, TimeOopMap, false, \
1462 "Time calls to GenerateOopMap::compute_map() in sum") \
1463 \
1464 develop(bool, TimeOopMap2, false, \
1465 "Time calls to GenerateOopMap::compute_map() individually") \
1466 \
1467 develop(bool, TraceMonitorMismatch, false, \
1468 "Trace monitor matching failures during OopMapGeneration") \
1469 \
1470 develop(bool, TraceOopMapRewrites, false, \
1471 "Trace rewriting of method oops during oop map generation") \
1472 \
1473 develop(bool, TraceSafepoint, false, \
1474 "Trace safepoint operations") \
1475 \
1476 develop(bool, TraceICBuffer, false, \
1477 "Trace usage of IC buffer") \
1478 \
1479 develop(bool, TraceCompiledIC, false, \
1480 "Trace changes of compiled IC") \
1481 \
1482 develop(bool, TraceStartupTime, false, \
1483 "Trace setup time") \
1484 \
1485 develop(bool, TraceProtectionDomainVerification, false, \
1486 "Trace protection domain verification") \
1487 \
1488 develop(bool, TraceClearedExceptions, false, \
1489 "Print when an exception is forcibly cleared") \
1490 \
1491 product(bool, TraceClassResolution, false, \
1492 "Trace all constant pool resolutions (for debugging)") \
1493 \
1494 product(bool, TraceBiasedLocking, false, \
1495 "Trace biased locking in JVM") \
1496 \
1497 product(bool, TraceMonitorInflation, false, \
1498 "Trace monitor inflation in JVM") \
1499 \
1500 /* gc */ \
1501 \
1502 product(bool, UseSerialGC, false, \
1503 "Use the Serial garbage collector") \
1504 \
1505 product(bool, UseG1GC, false, \
1506 "Use the Garbage-First garbage collector") \
1507 \
1508 product(bool, UseParallelGC, false, \
1509 "Use the Parallel Scavenge garbage collector") \
1510 \
1511 product(bool, UseParallelOldGC, false, \
1512 "Use the Parallel Old garbage collector") \
1513 \
1514 product(uintx, HeapMaximumCompactionInterval, 20, \
1515 "How often should we maximally compact the heap (not allowing " \
1516 "any dead space)") \
1517 \
1518 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1519 "The collection count for the first maximum compaction") \
1520 \
1521 product(bool, UseMaximumCompactionOnSystemGC, true, \
1522 "Use maximum compaction in the Parallel Old garbage collector " \
1523 "for a system GC") \
1524 \
1525 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1526 "The mean used by the parallel compact dead wood " \
1527 "limiter (a number between 0-100)") \
1528 range(0, 100) \
1529 \
1530 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1531 "The standard deviation used by the parallel compact dead wood " \
1532 "limiter (a number between 0-100)") \
1533 range(0, 100) \
1534 \
1535 product(uint, ParallelGCThreads, 0, \
1536 "Number of parallel threads parallel gc will use") \
1537 \
1538 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1539 "Use semaphore synchronization for the GC Threads, " \
1540 "instead of synchronization based on mutexes") \
1541 \
1542 product(bool, UseDynamicNumberOfGCThreads, false, \
1543 "Dynamically choose the number of parallel threads " \
1544 "parallel gc will use") \
1545 \
1546 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1547 "Force dynamic selection of the number of " \
1548 "parallel threads parallel gc will use to aid debugging") \
1549 \
1550 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1551 "Size of heap (bytes) per GC thread used in calculating the " \
1552 "number of GC threads") \
1553 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1554 \
1555 product(bool, TraceDynamicGCThreads, false, \
1556 "Trace the dynamic GC thread usage") \
1557 \
1558 develop(bool, ParallelOldGCSplitALot, false, \
1559 "Provoke splitting (copying data from a young gen space to " \
1560 "multiple destination spaces)") \
1561 \
1562 develop(uintx, ParallelOldGCSplitInterval, 3, \
1563 "How often to provoke splitting a young gen space") \
1564 range(0, max_uintx) \
1565 \
1566 product(uint, ConcGCThreads, 0, \
1567 "Number of threads concurrent gc will use") \
1568 \
1569 product(size_t, YoungPLABSize, 4096, \
1570 "Size of young gen promotion LAB's (in HeapWords)") \
1571 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
1572 \
1573 product(size_t, OldPLABSize, 1024, \
1574 "Size of old gen promotion LAB's (in HeapWords), or Number \
1575 of blocks to attempt to claim when refilling CMS LAB's") \
1576 \
1577 product(uintx, GCTaskTimeStampEntries, 200, \
1578 "Number of time stamp entries per gc worker thread") \
1579 range(1, max_uintx) \
1580 \
1581 product(bool, AlwaysTenure, false, \
1582 "Always tenure objects in eden (ParallelGC only)") \
1583 \
1584 product(bool, NeverTenure, false, \
1585 "Never tenure objects in eden, may tenure on overflow " \
1586 "(ParallelGC only)") \
1587 \
1588 product(bool, ScavengeBeforeFullGC, true, \
1589 "Scavenge young generation before each full GC.") \
1590 \
1591 develop(bool, ScavengeWithObjectsInToSpace, false, \
1592 "Allow scavenges to occur when to-space contains objects") \
1593 \
1594 product(bool, UseConcMarkSweepGC, false, \
1595 "Use Concurrent Mark-Sweep GC in the old generation") \
1596 \
1597 product(bool, ExplicitGCInvokesConcurrent, false, \
1598 "A System.gc() request invokes a concurrent collection; " \
1599 "(effective only when using concurrent collectors)") \
1600 \
1601 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1602 "A System.gc() request invokes a concurrent collection and " \
1603 "also unloads classes during such a concurrent gc cycle " \
1604 "(effective only when UseConcMarkSweepGC)") \
1605 \
1606 product(bool, GCLockerInvokesConcurrent, false, \
1607 "The exit of a JNI critical section necessitating a scavenge, " \
1608 "also kicks off a background concurrent collection") \
1609 \
1610 product(uintx, GCLockerEdenExpansionPercent, 5, \
1611 "How much the GC can expand the eden by while the GC locker " \
1612 "is active (as a percentage)") \
1613 range(0, 100) \
1614 \
1615 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1616 "Number of times to retry allocations when " \
1617 "blocked by the GC locker") \
1618 \
1619 develop(bool, UseCMSAdaptiveFreeLists, true, \
1620 "Use adaptive free lists in the CMS generation") \
1621 \
1622 develop(bool, UseAsyncConcMarkSweepGC, true, \
1623 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1624 \
1625 product(bool, UseCMSBestFit, true, \
1626 "Use CMS best fit allocation strategy") \
1627 \
1628 product(bool, UseParNewGC, false, \
1629 "Use parallel threads in the new generation") \
1630 \
1631 product(bool, PrintTaskqueue, false, \
1632 "Print taskqueue statistics for parallel collectors") \
1633 \
1634 product(bool, PrintTerminationStats, false, \
1635 "Print termination statistics for parallel collectors") \
1636 \
1637 product(uintx, ParallelGCBufferWastePct, 10, \
1638 "Wasted fraction of parallel allocation buffer") \
1639 range(0, 100) \
1640 \
1641 product(uintx, TargetPLABWastePct, 10, \
1642 "Target wasted space in last buffer as percent of overall " \
1643 "allocation") \
1644 range(1, 100) \
1645 \
1646 product(uintx, PLABWeight, 75, \
1647 "Percentage (0-100) used to weight the current sample when " \
1648 "computing exponentially decaying average for ResizePLAB") \
1649 range(0, 100) \
1650 \
1651 product(bool, ResizePLAB, true, \
1652 "Dynamically resize (survivor space) promotion LAB's") \
1653 \
1654 product(bool, PrintPLAB, false, \
1655 "Print (survivor space) promotion LAB's sizing decisions") \
1656 \
1657 product(intx, ParGCArrayScanChunk, 50, \
1658 "Scan a subset of object array and push remainder, if array is " \
1659 "bigger than this") \
1660 range(1, max_intx) \
1661 \
1662 product(bool, ParGCUseLocalOverflow, false, \
1663 "Instead of a global overflow list, use local overflow stacks") \
1664 \
1665 product(bool, ParGCTrimOverflow, true, \
1666 "Eagerly trim the local overflow lists " \
1667 "(when ParGCUseLocalOverflow)") \
1668 \
1669 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1670 "Simulate work queue overflow in ParNew") \
1671 \
1672 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1673 "An `interval' counter that determines how frequently " \
1674 "we simulate overflow; a smaller number increases frequency") \
1675 \
1676 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1677 "The desired number of objects to claim from the overflow list") \
1678 \
1679 diagnostic(uintx, ParGCStridesPerThread, 2, \
1680 "The number of strides per worker thread that we divide up the " \
1681 "card table scanning work into") \
1682 range(1, max_uintx) \
1683 \
1684 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1685 "The number of cards in each chunk of the parallel chunks used " \
1686 "during card table scanning") \
1687 range(1, max_intx) \
1688 \
1689 product(uintx, OldPLABWeight, 50, \
1690 "Percentage (0-100) used to weight the current sample when " \
1691 "computing exponentially decaying average for resizing " \
1692 "OldPLABSize") \
1693 range(0, 100) \
1694 \
1695 product(bool, ResizeOldPLAB, true, \
1696 "Dynamically resize (old gen) promotion LAB's") \
1697 \
1698 product(bool, PrintOldPLAB, false, \
1699 "Print (old gen) promotion LAB's sizing decisions") \
1700 \
1701 product(size_t, CMSOldPLABMax, 1024, \
1702 "Maximum size of CMS gen promotion LAB caches per worker " \
1703 "per block size") \
1704 range(1, max_uintx) \
1705 \
1706 product(size_t, CMSOldPLABMin, 16, \
1707 "Minimum size of CMS gen promotion LAB caches per worker " \
1708 "per block size") \
1709 range(1, max_uintx) \
1710 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \
1711 \
1712 product(uintx, CMSOldPLABNumRefills, 4, \
1713 "Nominal number of refills of CMS gen promotion LAB cache " \
1714 "per worker per block size") \
1715 range(1, max_uintx) \
1716 \
1717 product(bool, CMSOldPLABResizeQuicker, false, \
1718 "React on-the-fly during a scavenge to a sudden " \
1719 "change in block demand rate") \
1720 \
1721 product(uintx, CMSOldPLABToleranceFactor, 4, \
1722 "The tolerance of the phase-change detector for on-the-fly " \
1723 "PLAB resizing during a scavenge") \
1724 range(1, max_uintx) \
1725 \
1726 product(uintx, CMSOldPLABReactivityFactor, 2, \
1727 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1728 "during a scavenge") \
1729 \
1730 product(bool, AlwaysPreTouch, false, \
1731 "Force all freshly committed pages to be pre-touched") \
1732 \
1733 product_pd(size_t, CMSYoungGenPerWorker, \
1734 "The maximum size of young gen chosen by default per GC worker " \
1735 "thread available") \
1736 range(1, max_uintx) \
1737 \
1738 product(uintx, CMSIncrementalSafetyFactor, 10, \
1739 "Percentage (0-100) used to add conservatism when computing the " \
1740 "duty cycle") \
1741 range(0, 100) \
1742 \
1743 product(uintx, CMSExpAvgFactor, 50, \
1744 "Percentage (0-100) used to weight the current sample when " \
1745 "computing exponential averages for CMS statistics") \
1746 range(0, 100) \
1747 \
1748 product(uintx, CMS_FLSWeight, 75, \
1749 "Percentage (0-100) used to weight the current sample when " \
1750 "computing exponentially decaying averages for CMS FLS " \
1751 "statistics") \
1752 range(0, 100) \
1753 \
1754 product(uintx, CMS_FLSPadding, 1, \
1755 "The multiple of deviation from mean to use for buffering " \
1756 "against volatility in free list demand") \
1757 \
1758 product(uintx, FLSCoalescePolicy, 2, \
1759 "CMS: aggressiveness level for coalescing, increasing " \
1760 "from 0 to 4") \
1761 range(0, 4) \
1762 \
1763 product(bool, FLSAlwaysCoalesceLarge, false, \
1764 "CMS: larger free blocks are always available for coalescing") \
1765 \
1766 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1767 "CMS: the smaller the percentage the greater the coalescing " \
1768 "force") \
1769 \
1770 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1771 "CMS: the factor by which to inflate estimated demand of small " \
1772 "block sizes to prevent coalescing with an adjoining block") \
1773 \
1774 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1775 "CMS: the factor by which to inflate estimated demand of large " \
1776 "block sizes to prevent coalescing with an adjoining block") \
1777 \
1778 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1779 "CMS: the factor by which to inflate estimated demand of small " \
1780 "block sizes to prevent splitting to supply demand for smaller " \
1781 "blocks") \
1782 \
1783 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1784 "CMS: the factor by which to inflate estimated demand of large " \
1785 "block sizes to prevent splitting to supply demand for smaller " \
1786 "blocks") \
1787 \
1788 product(bool, CMSExtrapolateSweep, false, \
1789 "CMS: cushion for block demand during sweep") \
1790 \
1791 product(uintx, CMS_SweepWeight, 75, \
1792 "Percentage (0-100) used to weight the current sample when " \
1793 "computing exponentially decaying average for inter-sweep " \
1794 "duration") \
1795 range(0, 100) \
1796 \
1797 product(uintx, CMS_SweepPadding, 1, \
1798 "The multiple of deviation from mean to use for buffering " \
1799 "against volatility in inter-sweep duration") \
1800 \
1801 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1802 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1803 "duration exceeds this threshold in milliseconds") \
1804 \
1805 product(bool, CMSClassUnloadingEnabled, true, \
1806 "Whether class unloading enabled when using CMS GC") \
1807 \
1808 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1809 "When CMS class unloading is enabled, the maximum CMS cycle " \
1810 "count for which classes may not be unloaded") \
1811 \
1812 develop(intx, CMSDictionaryChoice, 0, \
1813 "Use BinaryTreeDictionary as default in the CMS generation") \
1814 \
1815 product(uintx, CMSIndexedFreeListReplenish, 4, \
1816 "Replenish an indexed free list with this number of chunks") \
1817 \
1818 product(bool, CMSReplenishIntermediate, true, \
1819 "Replenish all intermediate free-list caches") \
1820 \
1821 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1822 "When satisfying batched demand, split blocks from the " \
1823 "IndexedFreeList whose size is a multiple of requested size") \
1824 \
1825 product(bool, CMSLoopWarn, false, \
1826 "Warn in case of excessive CMS looping") \
1827 \
1828 develop(bool, CMSOverflowEarlyRestoration, false, \
1829 "Restore preserved marks early") \
1830 \
1831 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1832 "Size of marking stack") \
1833 \
1834 /* where does the range max value of (max_jint - 1) come from? */ \
1835 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1836 "Maximum size of marking stack") \
1837 range(1, (max_jint - 1)) \
1838 \
1839 notproduct(bool, CMSMarkStackOverflowALot, false, \
1840 "Simulate frequent marking stack / work queue overflow") \
1841 \
1842 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1843 "An \"interval\" counter that determines how frequently " \
1844 "to simulate overflow; a smaller number increases frequency") \
1845 \
1846 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1847 "Maximum number of abortable preclean iterations, if > 0") \
1848 \
1849 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1850 "Maximum time in abortable preclean (in milliseconds)") \
1851 \
1852 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1853 "Nominal minimum work per abortable preclean iteration") \
1854 \
1855 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1856 "Time that we sleep between iterations when not given " \
1857 "enough work per iteration") \
1858 \
1859 product(size_t, CMSRescanMultiple, 32, \
1860 "Size (in cards) of CMS parallel rescan task") \
1861 range(1, max_uintx) \
1862 \
1863 product(size_t, CMSConcMarkMultiple, 32, \
1864 "Size (in cards) of CMS concurrent MT marking task") \
1865 range(1, max_uintx) \
1866 \
1867 product(bool, CMSAbortSemantics, false, \
1868 "Whether abort-on-overflow semantics is implemented") \
1869 \
1870 product(bool, CMSParallelInitialMarkEnabled, true, \
1871 "Use the parallel initial mark.") \
1872 \
1873 product(bool, CMSParallelRemarkEnabled, true, \
1874 "Whether parallel remark enabled (only if ParNewGC)") \
1875 \
1876 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1877 "Whether parallel remark of survivor space " \
1878 "enabled (effective only if CMSParallelRemarkEnabled)") \
1879 \
1880 product(bool, CMSPLABRecordAlways, true, \
1881 "Always record survivor space PLAB boundaries (effective only " \
1882 "if CMSParallelSurvivorRemarkEnabled)") \
1883 \
1884 product(bool, CMSEdenChunksRecordAlways, true, \
1885 "Always record eden chunks used for the parallel initial mark " \
1886 "or remark of eden") \
1887 \
1888 product(bool, CMSPrintEdenSurvivorChunks, false, \
1889 "Print the eden and the survivor chunks used for the parallel " \
1890 "initial mark or remark of the eden/survivor spaces") \
1891 \
1892 product(bool, CMSConcurrentMTEnabled, true, \
1893 "Whether multi-threaded concurrent work enabled " \
1894 "(effective only if ParNewGC)") \
1895 \
1896 product(bool, CMSPrecleaningEnabled, true, \
1897 "Whether concurrent precleaning enabled") \
1898 \
1899 product(uintx, CMSPrecleanIter, 3, \
1900 "Maximum number of precleaning iteration passes") \
1901 range(0, 9) \
1902 \
1903 product(uintx, CMSPrecleanDenominator, 3, \
1904 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1905 "ratio") \
1906 range(1, max_uintx) \
1907 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1908 \
1909 product(uintx, CMSPrecleanNumerator, 2, \
1910 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1911 "ratio") \
1912 range(0, max_uintx-1) \
1913 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1914 \
1915 product(bool, CMSPrecleanRefLists1, true, \
1916 "Preclean ref lists during (initial) preclean phase") \
1917 \
1918 product(bool, CMSPrecleanRefLists2, false, \
1919 "Preclean ref lists during abortable preclean phase") \
1920 \
1921 product(bool, CMSPrecleanSurvivors1, false, \
1922 "Preclean survivors during (initial) preclean phase") \
1923 \
1924 product(bool, CMSPrecleanSurvivors2, true, \
1925 "Preclean survivors during abortable preclean phase") \
1926 \
1927 product(uintx, CMSPrecleanThreshold, 1000, \
1928 "Do not iterate again if number of dirty cards is less than this")\
1929 range(100, max_uintx) \
1930 \
1931 product(bool, CMSCleanOnEnter, true, \
1932 "Clean-on-enter optimization for reducing number of dirty cards") \
1933 \
1934 product(uintx, CMSRemarkVerifyVariant, 1, \
1935 "Choose variant (1,2) of verification following remark") \
1936 range(1, 2) \
1937 \
1938 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1939 "If Eden size is below this, do not try to schedule remark") \
1940 \
1941 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1942 "The Eden occupancy percentage (0-100) at which " \
1943 "to try and schedule remark pause") \
1944 range(0, 100) \
1945 \
1946 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1947 "Start sampling eden top at least before young gen " \
1948 "occupancy reaches 1/<ratio> of the size at which " \
1949 "we plan to schedule remark") \
1950 range(1, max_uintx) \
1951 \
1952 product(uintx, CMSSamplingGrain, 16*K, \
1953 "The minimum distance between eden samples for CMS (see above)") \
1954 range(1, max_uintx) \
1955 \
1956 product(bool, CMSScavengeBeforeRemark, false, \
1957 "Attempt scavenge before the CMS remark step") \
1958 \
1959 develop(bool, CMSTraceSweeper, false, \
1960 "Trace some actions of the CMS sweeper") \
1961 \
1962 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1963 "Don't drain below this size per parallel worker/thief") \
1964 \
1965 manageable(intx, CMSWaitDuration, 2000, \
1966 "Time in milliseconds that CMS thread waits for young GC") \
1967 \
1968 develop(uintx, CMSCheckInterval, 1000, \
1969 "Interval in milliseconds that CMS thread checks if it " \
1970 "should start a collection cycle") \
1971 \
1972 product(bool, CMSYield, true, \
1973 "Yield between steps of CMS") \
1974 \
1975 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1976 "Bitmap operations should process at most this many bits " \
1977 "between yields") \
1978 range(1, max_uintx) \
1979 \
1980 product(bool, CMSDumpAtPromotionFailure, false, \
1981 "Dump useful information about the state of the CMS old " \
1982 "generation upon a promotion failure") \
1983 \
1984 product(bool, CMSPrintChunksInDump, false, \
1985 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1986 "more detailed information about the free chunks") \
1987 \
1988 product(bool, CMSPrintObjectsInDump, false, \
1989 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1990 "more detailed information about the allocated objects") \
1991 \
1992 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1993 "Verify that all references across the FLS boundary " \
1994 "are to valid objects") \
1995 \
1996 diagnostic(bool, FLSVerifyLists, false, \
1997 "Do lots of (expensive) FreeListSpace verification") \
1998 \
1999 diagnostic(bool, FLSVerifyIndexTable, false, \
2000 "Do lots of (expensive) FLS index table verification") \
2001 \
2002 develop(bool, FLSVerifyDictionary, false, \
2003 "Do lots of (expensive) FLS dictionary verification") \
2004 \
2005 develop(bool, VerifyBlockOffsetArray, false, \
2006 "Do (expensive) block offset array verification") \
2007 \
2008 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2009 "Maintain _unallocated_block in BlockOffsetArray " \
2010 "(currently applicable only to CMS collector)") \
2011 \
2012 develop(bool, TraceCMSState, false, \
2013 "Trace the state of the CMS collection") \
2014 \
2015 product(intx, RefDiscoveryPolicy, 0, \
2016 "Select type of reference discovery policy: " \
2017 "reference-based(0) or referent-based(1)") \
2018 range(ReferenceProcessor::DiscoveryPolicyMin, \
2019 ReferenceProcessor::DiscoveryPolicyMax) \
2020 \
2021 product(bool, ParallelRefProcEnabled, false, \
2022 "Enable parallel reference processing whenever possible") \
2023 \
2024 product(bool, ParallelRefProcBalancingEnabled, true, \
2025 "Enable balancing of reference processing queues") \
2026 \
2027 product(uintx, CMSTriggerRatio, 80, \
2028 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2029 "allocated before a CMS collection cycle commences") \
2030 range(0, 100) \
2031 \
2032 product(uintx, CMSBootstrapOccupancy, 50, \
2033 "Percentage CMS generation occupancy at which to " \
2034 "initiate CMS collection for bootstrapping collection stats") \
2035 range(0, 100) \
2036 \
2037 product(intx, CMSInitiatingOccupancyFraction, -1, \
2038 "Percentage CMS generation occupancy to start a CMS collection " \
2039 "cycle. A negative value means that CMSTriggerRatio is used") \
2040 range(min_intx, 100) \
2041 \
2042 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2043 "Percentage of the (entire) heap occupancy to start a " \
2044 "concurrent GC cycle. It is used by GCs that trigger a " \
2045 "concurrent GC cycle based on the occupancy of the entire heap, " \
2046 "not just one of the generations (e.g., G1). A value of 0 " \
2047 "denotes 'do constant GC cycles'.") \
2048 range(0, 100) \
2049 \
2050 manageable(intx, CMSTriggerInterval, -1, \
2051 "Commence a CMS collection cycle (at least) every so many " \
2052 "milliseconds (0 permanently, -1 disabled)") \
2053 range(-1, max_intx) \
2054 \
2055 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2056 "Only use occupancy as a criterion for starting a CMS collection")\
2057 \
2058 product(uintx, CMSIsTooFullPercentage, 98, \
2059 "An absolute ceiling above which CMS will always consider the " \
2060 "unloading of classes when class unloading is enabled") \
2061 range(0, 100) \
2062 \
2063 develop(bool, CMSTestInFreeList, false, \
2064 "Check if the coalesced range is already in the " \
2065 "free lists as claimed") \
2066 \
2067 notproduct(bool, CMSVerifyReturnedBytes, false, \
2068 "Check that all the garbage collected was returned to the " \
2069 "free lists") \
2070 \
2071 notproduct(bool, ScavengeALot, false, \
2072 "Force scavenge at every Nth exit from the runtime system " \
2073 "(N=ScavengeALotInterval)") \
2074 \
2075 develop(bool, FullGCALot, false, \
2076 "Force full gc at every Nth exit from the runtime system " \
2077 "(N=FullGCALotInterval)") \
2078 \
2079 notproduct(bool, GCALotAtAllSafepoints, false, \
2080 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2081 \
2082 product(bool, PrintPromotionFailure, false, \
2083 "Print additional diagnostic information following " \
2084 "promotion failure") \
2085 \
2086 notproduct(bool, PromotionFailureALot, false, \
2087 "Use promotion failure handling on every young generation " \
2088 "collection") \
2089 \
2090 develop(uintx, PromotionFailureALotCount, 1000, \
2091 "Number of promotion failures occurring at PLAB " \
2092 "refill attempts (ParNew) or promotion attempts " \
2093 "(other young collectors)") \
2094 \
2095 develop(uintx, PromotionFailureALotInterval, 5, \
2096 "Total collections between promotion failures a lot") \
2097 \
2098 experimental(uintx, WorkStealingSleepMillis, 1, \
2099 "Sleep time when sleep is used for yields") \
2100 \
2101 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2102 "Number of yields before a sleep is done during work stealing") \
2103 \
2104 experimental(uintx, WorkStealingHardSpins, 4096, \
2105 "Number of iterations in a spin loop between checks on " \
2106 "time out of hard spin") \
2107 \
2108 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2109 "Ratio of hard spins to calls to yield") \
2110 \
2111 develop(uintx, ObjArrayMarkingStride, 512, \
2112 "Number of object array elements to push onto the marking stack " \
2113 "before pushing a continuation entry") \
2114 \
2115 develop(bool, MetadataAllocationFailALot, false, \
2116 "Fail metadata allocations at intervals controlled by " \
2117 "MetadataAllocationFailALotInterval") \
2118 \
2119 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2120 "Metadata allocation failure a lot interval") \
2121 \
2122 develop(bool, TraceMetadataChunkAllocation, false, \
2123 "Trace chunk metadata allocations") \
2124 \
2125 product(bool, TraceMetadataHumongousAllocation, false, \
2126 "Trace humongous metadata allocations") \
2127 \
2128 develop(bool, TraceMetavirtualspaceAllocation, false, \
2129 "Trace virtual space metadata allocations") \
2130 \
2131 notproduct(bool, ExecuteInternalVMTests, false, \
2132 "Enable execution of internal VM tests") \
2133 \
2134 notproduct(bool, VerboseInternalVMTests, false, \
2135 "Turn on logging for internal VM tests.") \
2136 \
2137 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2138 \
2139 product_pd(bool, ResizeTLAB, \
2140 "Dynamically resize TLAB size for threads") \
2141 \
2142 product(bool, ZeroTLAB, false, \
2143 "Zero out the newly created TLAB") \
2144 \
2145 product(bool, FastTLABRefill, true, \
2146 "Use fast TLAB refill code") \
2147 \
2148 product(bool, PrintTLAB, false, \
2149 "Print various TLAB related information") \
2150 \
2151 product(bool, TLABStats, true, \
2152 "Provide more detailed and expensive TLAB statistics " \
2153 "(with PrintTLAB)") \
2154 \
2155 product_pd(bool, NeverActAsServerClassMachine, \
2156 "Never act like a server-class machine") \
2157 \
2158 product(bool, AlwaysActAsServerClassMachine, false, \
2159 "Always act like a server-class machine") \
2160 \
2161 product_pd(uint64_t, MaxRAM, \
2162 "Real memory size (in bytes) used to set maximum heap size") \
2163 \
2164 product(size_t, ErgoHeapSizeLimit, 0, \
2165 "Maximum ergonomically set heap size (in bytes); zero means use " \
2166 "MaxRAM / MaxRAMFraction") \
2167 \
2168 product(uintx, MaxRAMFraction, 4, \
2169 "Maximum fraction (1/n) of real memory used for maximum heap " \
2170 "size") \
2171 range(1, max_uintx) \
2172 \
2173 product(uintx, DefaultMaxRAMFraction, 4, \
2174 "Maximum fraction (1/n) of real memory used for maximum heap " \
2175 "size; deprecated: to be renamed to MaxRAMFraction") \
2176 range(1, max_uintx) \
2177 \
2178 product(uintx, MinRAMFraction, 2, \
2179 "Minimum fraction (1/n) of real memory used for maximum heap " \
2180 "size on systems with small physical memory size") \
2181 range(1, max_uintx) \
2182 \
2183 product(uintx, InitialRAMFraction, 64, \
2184 "Fraction (1/n) of real memory used for initial heap size") \
2185 range(1, max_uintx) \
2186 \
2187 develop(uintx, MaxVirtMemFraction, 2, \
2188 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2189 "determining maximum heap size") \
2190 \
2191 product(bool, UseAutoGCSelectPolicy, false, \
2192 "Use automatic collection selection policy") \
2193 \
2194 product(uintx, AutoGCSelectPauseMillis, 5000, \
2195 "Automatic GC selection pause threshold in milliseconds") \
2196 \
2197 product(bool, UseAdaptiveSizePolicy, true, \
2198 "Use adaptive generation sizing policies") \
2199 \
2200 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2201 "Use adaptive survivor sizing policies") \
2202 \
2203 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2204 "Use adaptive young-old sizing policies at minor collections") \
2205 \
2206 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2207 "Use adaptive young-old sizing policies at major collections") \
2208 \
2209 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2210 "Include statistics from System.gc() for adaptive size policy") \
2211 \
2212 product(bool, UseAdaptiveGCBoundary, false, \
2213 "Allow young-old boundary to move") \
2214 \
2215 develop(bool, TraceAdaptiveGCBoundary, false, \
2216 "Trace young-old boundary moves") \
2217 \
2218 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2219 "Resize the virtual spaces of the young or old generations") \
2220 \
2221 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2222 "Policy for changing generation size for throughput goals") \
2223 \
2224 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2225 "Adjust tenured generation to achieve a minor pause goal") \
2226 \
2227 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2228 "Adjust young generation to achieve a major pause goal") \
2229 \
2230 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2231 "Number of steps where heuristics is used before data is used") \
2232 \
2233 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2234 "Number of collections before the adaptive sizing is started") \
2235 \
2236 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2237 "Collection interval for printing information; zero means never") \
2238 \
2239 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2240 "Use adaptive minimum footprint as a goal") \
2241 \
2242 product(uintx, AdaptiveSizePolicyWeight, 10, \
2243 "Weight given to exponential resizing, between 0 and 100") \
2244 range(0, 100) \
2245 \
2246 product(uintx, AdaptiveTimeWeight, 25, \
2247 "Weight given to time in adaptive policy, between 0 and 100") \
2248 range(0, 100) \
2249 \
2250 product(uintx, PausePadding, 1, \
2251 "How much buffer to keep for pause time") \
2252 \
2253 product(uintx, PromotedPadding, 3, \
2254 "How much buffer to keep for promotion failure") \
2255 \
2256 product(uintx, SurvivorPadding, 3, \
2257 "How much buffer to keep for survivor overflow") \
2258 \
2259 product(uintx, ThresholdTolerance, 10, \
2260 "Allowed collection cost difference between generations") \
2261 range(0, 100) \
2262 \
2263 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2264 "If collection costs are within margin, reduce both by full " \
2265 "delta") \
2266 \
2267 product(uintx, YoungGenerationSizeIncrement, 20, \
2268 "Adaptive size percentage change in young generation") \
2269 range(0, 100) \
2270 \
2271 product(uintx, YoungGenerationSizeSupplement, 80, \
2272 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2273 range(0, 100) \
2274 \
2275 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2276 "Decay factor to YoungedGenerationSizeSupplement") \
2277 range(1, max_uintx) \
2278 \
2279 product(uintx, TenuredGenerationSizeIncrement, 20, \
2280 "Adaptive size percentage change in tenured generation") \
2281 range(0, 100) \
2282 \
2283 product(uintx, TenuredGenerationSizeSupplement, 80, \
2284 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2285 range(0, 100) \
2286 \
2287 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2288 "Decay factor to TenuredGenerationSizeIncrement") \
2289 range(1, max_uintx) \
2290 \
2291 product(uintx, MaxGCPauseMillis, max_uintx, \
2292 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2293 "or (G1 Only) the maximum GC time per MMU time slice") \
2294 \
2295 product(uintx, GCPauseIntervalMillis, 0, \
2296 "Time slice for MMU specification") \
2297 \
2298 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2299 "Adaptive size policy maximum GC minor pause time goal " \
2300 "in millisecond") \
2301 \
2302 product(uintx, GCTimeRatio, 99, \
2303 "Adaptive size policy application time to GC time ratio") \
2304 \
2305 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2306 "Adaptive size scale down factor for shrinking") \
2307 range(1, max_uintx) \
2308 \
2309 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2310 "Adaptive size decays the major cost for long major intervals") \
2311 \
2312 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2313 "Time scale over which major costs decay") \
2314 \
2315 product(uintx, MinSurvivorRatio, 3, \
2316 "Minimum ratio of young generation/survivor space size") \
2317 \
2318 product(uintx, InitialSurvivorRatio, 8, \
2319 "Initial ratio of young generation/survivor space size") \
2320 \
2321 product(size_t, BaseFootPrintEstimate, 256*M, \
2322 "Estimate of footprint other than Java Heap") \
2323 \
2324 product(bool, UseGCOverheadLimit, true, \
2325 "Use policy to limit of proportion of time spent in GC " \
2326 "before an OutOfMemory error is thrown") \
2327 \
2328 product(uintx, GCTimeLimit, 98, \
2329 "Limit of the proportion of time spent in GC before " \
2330 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2331 range(0, 100) \
2332 \
2333 product(uintx, GCHeapFreeLimit, 2, \
2334 "Minimum percentage of free space after a full GC before an " \
2335 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2336 range(0, 100) \
2337 \
2338 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2339 "Number of consecutive collections before gc time limit fires") \
2340 \
2341 product(bool, PrintAdaptiveSizePolicy, false, \
2342 "Print information about AdaptiveSizePolicy") \
2343 \
2344 product(intx, PrefetchCopyIntervalInBytes, -1, \
2345 "How far ahead to prefetch destination area (<= 0 means off)") \
2346 \
2347 product(intx, PrefetchScanIntervalInBytes, -1, \
2348 "How far ahead to prefetch scan area (<= 0 means off)") \
2349 \
2350 product(intx, PrefetchFieldsAhead, -1, \
2351 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2352 \
2353 diagnostic(bool, VerifySilently, false, \
2354 "Do not print the verification progress") \
2355 \
2356 diagnostic(bool, VerifyDuringStartup, false, \
2357 "Verify memory system before executing any Java code " \
2358 "during VM initialization") \
2359 \
2360 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2361 "Verify system before exiting") \
2362 \
2363 diagnostic(bool, VerifyBeforeGC, false, \
2364 "Verify memory system before GC") \
2365 \
2366 diagnostic(bool, VerifyAfterGC, false, \
2367 "Verify memory system after GC") \
2368 \
2369 diagnostic(bool, VerifyDuringGC, false, \
2370 "Verify memory system during GC (between phases)") \
2371 \
2372 diagnostic(bool, GCParallelVerificationEnabled, true, \
2373 "Enable parallel memory system verification") \
2374 \
2375 diagnostic(bool, DeferInitialCardMark, false, \
2376 "When +ReduceInitialCardMarks, explicitly defer any that " \
2377 "may arise from new_pre_store_barrier") \
2378 \
2379 product(bool, UseCondCardMark, false, \
2380 "Check for already marked card before updating card table") \
2381 \
2382 diagnostic(bool, VerifyRememberedSets, false, \
2383 "Verify GC remembered sets") \
2384 \
2385 diagnostic(bool, VerifyObjectStartArray, true, \
2386 "Verify GC object start array if verify before/after") \
2387 \
2388 product(bool, DisableExplicitGC, false, \
2389 "Ignore calls to System.gc()") \
2390 \
2391 notproduct(bool, CheckMemoryInitialization, false, \
2392 "Check memory initialization") \
2393 \
2394 diagnostic(bool, BindCMSThreadToCPU, false, \
2395 "Bind CMS Thread to CPU if possible") \
2396 \
2397 diagnostic(uintx, CPUForCMSThread, 0, \
2398 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2399 \
2400 product(bool, BindGCTaskThreadsToCPUs, false, \
2401 "Bind GCTaskThreads to CPUs if possible") \
2402 \
2403 product(bool, UseGCTaskAffinity, false, \
2404 "Use worker affinity when asking for GCTasks") \
2405 \
2406 product(uintx, ProcessDistributionStride, 4, \
2407 "Stride through processors when distributing processes") \
2408 \
2409 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2410 "Number of times the coordinator GC thread will sleep while " \
2411 "yielding before giving up and resuming GC") \
2412 \
2413 product(uintx, CMSYieldSleepCount, 0, \
2414 "Number of times a GC thread (minus the coordinator) " \
2415 "will sleep while yielding before giving up and resuming GC") \
2416 \
2417 /* gc tracing */ \
2418 manageable(bool, PrintGC, false, \
2419 "Print message at garbage collection") \
2420 \
2421 manageable(bool, PrintGCDetails, false, \
2422 "Print more details at garbage collection") \
2423 \
2424 manageable(bool, PrintGCDateStamps, false, \
2425 "Print date stamps at garbage collection") \
2426 \
2427 manageable(bool, PrintGCTimeStamps, false, \
2428 "Print timestamps at garbage collection") \
2429 \
2430 manageable(bool, PrintGCID, true, \
2431 "Print an identifier for each garbage collection") \
2432 \
2433 product(bool, PrintGCTaskTimeStamps, false, \
2434 "Print timestamps for individual gc worker thread tasks") \
2435 \
2436 develop(intx, ConcGCYieldTimeout, 0, \
2437 "If non-zero, assert that GC threads yield within this " \
2438 "number of milliseconds") \
2439 \
2440 product(bool, PrintReferenceGC, false, \
2441 "Print times spent handling reference objects during GC " \
2442 "(enabled only when PrintGCDetails)") \
2443 \
2444 develop(bool, TraceReferenceGC, false, \
2445 "Trace handling of soft/weak/final/phantom references") \
2446 \
2447 develop(bool, TraceFinalizerRegistration, false, \
2448 "Trace registration of final references") \
2449 \
2450 notproduct(bool, TraceScavenge, false, \
2451 "Trace scavenge") \
2452 \
2453 product(bool, IgnoreEmptyClassPaths, false, \
2454 "Ignore empty path elements in -classpath") \
2455 \
2456 product(bool, TraceClassPaths, false, \
2457 "Trace processing of class paths") \
2458 \
2459 product_rw(bool, TraceClassLoading, false, \
2460 "Trace all classes loaded") \
2461 \
2462 product(bool, TraceClassLoadingPreorder, false, \
2463 "Trace all classes loaded in order referenced (not loaded)") \
2464 \
2465 product_rw(bool, TraceClassUnloading, false, \
2466 "Trace unloading of classes") \
2467 \
2468 product_rw(bool, TraceLoaderConstraints, false, \
2469 "Trace loader constraints") \
2470 \
2471 develop(bool, TraceClassLoaderData, false, \
2472 "Trace class loader loader_data lifetime") \
2473 \
2474 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2475 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2476 "Initial size of the boot class loader data metaspace") \
2477 \
2478 product(bool, TraceYoungGenTime, false, \
2479 "Trace accumulated time for young collection") \
2480 \
2481 product(bool, TraceOldGenTime, false, \
2482 "Trace accumulated time for old collection") \
2483 \
2484 product(bool, PrintTenuringDistribution, false, \
2485 "Print tenuring age information") \
2486 \
2487 product_rw(bool, PrintHeapAtGC, false, \
2488 "Print heap layout before and after each GC") \
2489 \
2490 product_rw(bool, PrintHeapAtGCExtended, false, \
2491 "Print extended information about the layout of the heap " \
2492 "when -XX:+PrintHeapAtGC is set") \
2493 \
2494 product(bool, PrintHeapAtSIGBREAK, true, \
2495 "Print heap layout in response to SIGBREAK") \
2496 \
2497 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2498 "Print a class histogram before any major stop-world GC") \
2499 \
2500 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2501 "Print a class histogram after any major stop-world GC") \
2502 \
2503 manageable(bool, PrintClassHistogram, false, \
2504 "Print a histogram of class instances") \
2505 \
2506 develop(bool, TraceWorkGang, false, \
2507 "Trace activities of work gangs") \
2508 \
2509 product(bool, TraceParallelOldGCTasks, false, \
2510 "Trace multithreaded GC activity") \
2511 \
2512 develop(bool, TraceBlockOffsetTable, false, \
2513 "Print BlockOffsetTable maps") \
2514 \
2515 develop(bool, TraceCardTableModRefBS, false, \
2516 "Print CardTableModRefBS maps") \
2517 \
2518 develop(bool, TraceGCTaskManager, false, \
2519 "Trace actions of the GC task manager") \
2520 \
2521 develop(bool, TraceGCTaskQueue, false, \
2522 "Trace actions of the GC task queues") \
2523 \
2524 diagnostic(bool, TraceGCTaskThread, false, \
2525 "Trace actions of the GC task threads") \
2526 \
2527 product(bool, PrintParallelOldGCPhaseTimes, false, \
2528 "Print the time taken by each phase in ParallelOldGC " \
2529 "(PrintGCDetails must also be enabled)") \
2530 \
2531 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2532 "Trace marking phase in ParallelOldGC") \
2533 \
2534 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2535 "Trace summary phase in ParallelOldGC") \
2536 \
2537 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2538 "Trace compaction phase in ParallelOldGC") \
2539 \
2540 develop(bool, TraceParallelOldGCDensePrefix, false, \
2541 "Trace dense prefix computation for ParallelOldGC") \
2542 \
2543 develop(bool, IgnoreLibthreadGPFault, false, \
2544 "Suppress workaround for libthread GP fault") \
2545 \
2546 product(bool, PrintJNIGCStalls, false, \
2547 "Print diagnostic message when GC is stalled " \
2548 "by JNI critical section") \
2549 \
2550 experimental(double, ObjectCountCutOffPercent, 0.5, \
2551 "The percentage of the used heap that the instances of a class " \
2552 "must occupy for the class to generate a trace event") \
2553 \
2554 /* GC log rotation setting */ \
2555 \
2556 product(bool, UseGCLogFileRotation, false, \
2557 "Rotate gclog files (for long running applications). It requires "\
2558 "-Xloggc:<filename>") \
2559 \
2560 product(uintx, NumberOfGCLogFiles, 0, \
2561 "Number of gclog files in rotation " \
2562 "(default: 0, no rotation)") \
2563 \
2564 product(size_t, GCLogFileSize, 8*K, \
2565 "GC log file size, requires UseGCLogFileRotation. " \
2566 "Set to 0 to only trigger rotation via jcmd") \
2567 \
2568 /* JVMTI heap profiling */ \
2569 \
2570 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2571 "Trace JVMTI object tagging calls") \
2572 \
2573 diagnostic(bool, VerifyBeforeIteration, false, \
2574 "Verify memory system before JVMTI iteration") \
2575 \
2576 /* compiler interface */ \
2577 \
2578 develop(bool, CIPrintCompilerName, false, \
2579 "when CIPrint is active, print the name of the active compiler") \
2580 \
2581 diagnostic(bool, CIPrintCompileQueue, false, \
2582 "display the contents of the compile queue whenever a " \
2583 "compilation is enqueued") \
2584 \
2585 develop(bool, CIPrintRequests, false, \
2586 "display every request for compilation") \
2587 \
2588 product(bool, CITime, false, \
2589 "collect timing information for compilation") \
2590 \
2591 develop(bool, CITimeVerbose, false, \
2592 "be more verbose in compilation timings") \
2593 \
2594 develop(bool, CITimeEach, false, \
2595 "display timing information after each successful compilation") \
2596 \
2597 develop(bool, CICountOSR, false, \
2598 "use a separate counter when assigning ids to osr compilations") \
2599 \
2600 develop(bool, CICompileNatives, true, \
2601 "compile native methods if supported by the compiler") \
2602 \
2603 develop_pd(bool, CICompileOSR, \
2604 "compile on stack replacement methods if supported by the " \
2605 "compiler") \
2606 \
2607 develop(bool, CIPrintMethodCodes, false, \
2608 "print method bytecodes of the compiled code") \
2609 \
2610 develop(bool, CIPrintTypeFlow, false, \
2611 "print the results of ciTypeFlow analysis") \
2612 \
2613 develop(bool, CITraceTypeFlow, false, \
2614 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2615 \
2616 develop(intx, OSROnlyBCI, -1, \
2617 "OSR only at this bci. Negative values mean exclude that bci") \
2618 \
2619 /* compiler */ \
2620 \
2621 /* notice: the max range value here is max_jint, not max_intx */ \
2622 /* because of overflow issue */ \
2623 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2624 "Number of compiler threads to run") \
2625 range(0, max_jint) \
2626 constraint(CICompilerCountConstraintFunc, AtParse) \
2627 \
2628 product(intx, CompilationPolicyChoice, 0, \
2629 "which compilation policy (0-3)") \
2630 range(0, 3) \
2631 \
2632 develop(bool, UseStackBanging, true, \
2633 "use stack banging for stack overflow checks (required for " \
2634 "proper StackOverflow handling; disable only to measure cost " \
2635 "of stackbanging)") \
2636 \
2637 develop(bool, UseStrictFP, true, \
2638 "use strict fp if modifier strictfp is set") \
2639 \
2640 develop(bool, GenerateSynchronizationCode, true, \
2641 "generate locking/unlocking code for synchronized methods and " \
2642 "monitors") \
2643 \
2644 develop(bool, GenerateCompilerNullChecks, true, \
2645 "Generate explicit null checks for loads/stores/calls") \
2646 \
2647 develop(bool, GenerateRangeChecks, true, \
2648 "Generate range checks for array accesses") \
2649 \
2650 develop_pd(bool, ImplicitNullChecks, \
2651 "Generate code for implicit null checks") \
2652 \
2653 product_pd(bool, TrapBasedNullChecks, \
2654 "Generate code for null checks that uses a cmp and trap " \
2655 "instruction raising SIGTRAP. This is only used if an access to" \
2656 "null (+offset) will not raise a SIGSEGV, i.e.," \
2657 "ImplicitNullChecks don't work (PPC64).") \
2658 \
2659 product(bool, PrintSafepointStatistics, false, \
2660 "Print statistics about safepoint synchronization") \
2661 \
2662 product(intx, PrintSafepointStatisticsCount, 300, \
2663 "Total number of safepoint statistics collected " \
2664 "before printing them out") \
2665 \
2666 product(intx, PrintSafepointStatisticsTimeout, -1, \
2667 "Print safepoint statistics only when safepoint takes " \
2668 "more than PrintSafepointSatisticsTimeout in millis") \
2669 \
2670 product(bool, TraceSafepointCleanupTime, false, \
2671 "Print the break down of clean up tasks performed during " \
2672 "safepoint") \
2673 \
2674 product(bool, Inline, true, \
2675 "Enable inlining") \
2676 \
2677 product(bool, ClipInlining, true, \
2678 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2679 \
2680 develop(bool, UseCHA, true, \
2681 "Enable CHA") \
2682 \
2683 product(bool, UseTypeProfile, true, \
2684 "Check interpreter profile for historically monomorphic calls") \
2685 \
2686 diagnostic(bool, PrintInlining, false, \
2687 "Print inlining optimizations") \
2688 \
2689 product(bool, UsePopCountInstruction, false, \
2690 "Use population count instruction") \
2691 \
2692 develop(bool, EagerInitialization, false, \
2693 "Eagerly initialize classes if possible") \
2694 \
2695 diagnostic(bool, LogTouchedMethods, false, \
2696 "Log methods which have been ever touched in runtime") \
2697 \
2698 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2699 "Print all methods that have been ever touched in runtime") \
2700 \
2701 develop(bool, TraceMethodReplacement, false, \
2702 "Print when methods are replaced do to recompilation") \
2703 \
2704 develop(bool, PrintMethodFlushing, false, \
2705 "Print the nmethods being flushed") \
2706 \
2707 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2708 "print statistics about method flushing") \
2709 \
2710 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2711 "Number of compiled code invocations after which " \
2712 "the method is considered as hot by the flusher") \
2713 \
2714 diagnostic(intx, MinPassesBeforeFlush, 10, \
2715 "Minimum number of sweeper passes before an nmethod " \
2716 "can be flushed") \
2717 \
2718 product(bool, UseCodeAging, true, \
2719 "Insert counter to detect warm methods") \
2720 \
2721 diagnostic(bool, StressCodeAging, false, \
2722 "Start with counters compiled in") \
2723 \
2724 develop(bool, UseRelocIndex, false, \
2725 "Use an index to speed random access to relocations") \
2726 \
2727 develop(bool, StressCodeBuffers, false, \
2728 "Exercise code buffer expansion and other rare state changes") \
2729 \
2730 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2731 "Generate extra debugging information for non-safepoints in " \
2732 "nmethods") \
2733 \
2734 product(bool, PrintVMOptions, false, \
2735 "Print flags that appeared on the command line") \
2736 \
2737 product(bool, IgnoreUnrecognizedVMOptions, false, \
2738 "Ignore unrecognized VM options") \
2739 \
2740 product(bool, PrintCommandLineFlags, false, \
2741 "Print flags specified on command line or set by ergonomics") \
2742 \
2743 product(bool, PrintFlagsInitial, false, \
2744 "Print all VM flags before argument processing and exit VM") \
2745 \
2746 product(bool, PrintFlagsFinal, false, \
2747 "Print all VM flags after argument and ergonomic processing") \
2748 \
2749 notproduct(bool, PrintFlagsWithComments, false, \
2750 "Print all VM flags with default values and descriptions and " \
2751 "exit") \
2752 \
2753 product(bool, PrintFlagsRanges, false, \
2754 "Print VM flags and their ranges and exit VM") \
2755 \
2756 diagnostic(bool, SerializeVMOutput, true, \
2757 "Use a mutex to serialize output to tty and LogFile") \
2758 \
2759 diagnostic(bool, DisplayVMOutput, true, \
2760 "Display all VM output on the tty, independently of LogVMOutput") \
2761 \
2762 diagnostic(bool, LogVMOutput, false, \
2763 "Save VM output to LogFile") \
2764 \
2765 diagnostic(ccstr, LogFile, NULL, \
2766 "If LogVMOutput or LogCompilation is on, save VM output to " \
2767 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2768 \
2769 product(ccstr, ErrorFile, NULL, \
2770 "If an error occurs, save the error data to this file " \
2771 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2772 \
2773 product(bool, DisplayVMOutputToStderr, false, \
2774 "If DisplayVMOutput is true, display all VM output to stderr") \
2775 \
2776 product(bool, DisplayVMOutputToStdout, false, \
2777 "If DisplayVMOutput is true, display all VM output to stdout") \
2778 \
2779 product(bool, UseHeavyMonitors, false, \
2780 "use heavyweight instead of lightweight Java monitors") \
2781 \
2782 product(bool, PrintStringTableStatistics, false, \
2783 "print statistics about the StringTable and SymbolTable") \
2784 \
2785 diagnostic(bool, VerifyStringTableAtExit, false, \
2786 "verify StringTable contents at exit") \
2787 \
2788 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2789 "print histogram of the symbol table") \
2790 \
2791 notproduct(bool, ExitVMOnVerifyError, false, \
2792 "standard exit from VM if bytecode verify error " \
2793 "(only in debug mode)") \
2794 \
2795 notproduct(ccstr, AbortVMOnException, NULL, \
2796 "Call fatal if this exception is thrown. Example: " \
2797 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2798 \
2799 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2800 "Call fatal if the exception pointed by AbortVMOnException " \
2801 "has this message") \
2802 \
2803 develop(bool, DebugVtables, false, \
2804 "add debugging code to vtable dispatch") \
2805 \
2806 develop(bool, PrintVtables, false, \
2807 "print vtables when printing klass") \
2808 \
2809 notproduct(bool, PrintVtableStats, false, \
2810 "print vtables stats at end of run") \
2811 \
2812 develop(bool, TraceCreateZombies, false, \
2813 "trace creation of zombie nmethods") \
2814 \
2815 notproduct(bool, IgnoreLockingAssertions, false, \
2816 "disable locking assertions (for speed)") \
2817 \
2818 product(bool, RangeCheckElimination, true, \
2819 "Eliminate range checks") \
2820 \
2821 develop_pd(bool, UncommonNullCast, \
2822 "track occurrences of null in casts; adjust compiler tactics") \
2823 \
2824 develop(bool, TypeProfileCasts, true, \
2825 "treat casts like calls for purposes of type profiling") \
2826 \
2827 develop(bool, DelayCompilationDuringStartup, true, \
2828 "Delay invoking the compiler until main application class is " \
2829 "loaded") \
2830 \
2831 develop(bool, CompileTheWorld, false, \
2832 "Compile all methods in all classes in bootstrap class path " \
2833 "(stress test)") \
2834 \
2835 develop(bool, CompileTheWorldPreloadClasses, true, \
2836 "Preload all classes used by a class before start loading") \
2837 \
2838 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2839 "Force a safepoint every n compiles so sweeper can keep up") \
2840 \
2841 develop(bool, FillDelaySlots, true, \
2842 "Fill delay slots (on SPARC only)") \
2843 \
2844 develop(bool, TimeLivenessAnalysis, false, \
2845 "Time computation of bytecode liveness analysis") \
2846 \
2847 develop(bool, TraceLivenessGen, false, \
2848 "Trace the generation of liveness analysis information") \
2849 \
2850 notproduct(bool, TraceLivenessQuery, false, \
2851 "Trace queries of liveness analysis information") \
2852 \
2853 notproduct(bool, CollectIndexSetStatistics, false, \
2854 "Collect information about IndexSets") \
2855 \
2856 develop(bool, UseLoopSafepoints, true, \
2857 "Generate Safepoint nodes in every loop") \
2858 \
2859 develop(intx, FastAllocateSizeLimit, 128*K, \
2860 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2861 "Inline allocations larger than this in doublewords must go slow")\
2862 \
2863 product(bool, AggressiveOpts, false, \
2864 "Enable aggressive optimizations - see arguments.cpp") \
2865 \
2866 product_pd(uintx, TypeProfileLevel, \
2867 "=XYZ, with Z: Type profiling of arguments at call; " \
2868 "Y: Type profiling of return value at call; " \
2869 "X: Type profiling of parameters to methods; " \
2870 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2871 \
2872 product(intx, TypeProfileArgsLimit, 2, \
2873 "max number of call arguments to consider for type profiling") \
2874 \
2875 product(intx, TypeProfileParmsLimit, 2, \
2876 "max number of incoming parameters to consider for type profiling"\
2877 ", -1 for all") \
2878 \
2879 /* statistics */ \
2880 develop(bool, CountCompiledCalls, false, \
2881 "Count method invocations") \
2882 \
2883 notproduct(bool, CountRuntimeCalls, false, \
2884 "Count VM runtime calls") \
2885 \
2886 develop(bool, CountJNICalls, false, \
2887 "Count jni method invocations") \
2888 \
2889 notproduct(bool, CountJVMCalls, false, \
2890 "Count jvm method invocations") \
2891 \
2892 notproduct(bool, CountRemovableExceptions, false, \
2893 "Count exceptions that could be replaced by branches due to " \
2894 "inlining") \
2895 \
2896 notproduct(bool, ICMissHistogram, false, \
2897 "Produce histogram of IC misses") \
2898 \
2899 /* interpreter */ \
2900 develop(bool, ClearInterpreterLocals, false, \
2901 "Always clear local variables of interpreter activations upon " \
2902 "entry") \
2903 \
2904 product_pd(bool, RewriteBytecodes, \
2905 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2906 \
2907 product_pd(bool, RewriteFrequentPairs, \
2908 "Rewrite frequently used bytecode pairs into a single bytecode") \
2909 \
2910 diagnostic(bool, PrintInterpreter, false, \
2911 "Print the generated interpreter code") \
2912 \
2913 product(bool, UseInterpreter, true, \
2914 "Use interpreter for non-compiled methods") \
2915 \
2916 develop(bool, UseFastSignatureHandlers, true, \
2917 "Use fast signature handlers for native calls") \
2918 \
2919 product(bool, UseLoopCounter, true, \
2920 "Increment invocation counter on backward branch") \
2921 \
2922 product_pd(bool, UseOnStackReplacement, \
2923 "Use on stack replacement, calls runtime if invoc. counter " \
2924 "overflows in loop") \
2925 \
2926 notproduct(bool, TraceOnStackReplacement, false, \
2927 "Trace on stack replacement") \
2928 \
2929 product_pd(bool, PreferInterpreterNativeStubs, \
2930 "Use always interpreter stubs for native methods invoked via " \
2931 "interpreter") \
2932 \
2933 develop(bool, CountBytecodes, false, \
2934 "Count number of bytecodes executed") \
2935 \
2936 develop(bool, PrintBytecodeHistogram, false, \
2937 "Print histogram of the executed bytecodes") \
2938 \
2939 develop(bool, PrintBytecodePairHistogram, false, \
2940 "Print histogram of the executed bytecode pairs") \
2941 \
2942 diagnostic(bool, PrintSignatureHandlers, false, \
2943 "Print code generated for native method signature handlers") \
2944 \
2945 develop(bool, VerifyOops, false, \
2946 "Do plausibility checks for oops") \
2947 \
2948 develop(bool, CheckUnhandledOops, false, \
2949 "Check for unhandled oops in VM code") \
2950 \
2951 develop(bool, VerifyJNIFields, trueInDebug, \
2952 "Verify jfieldIDs for instance fields") \
2953 \
2954 notproduct(bool, VerifyJNIEnvThread, false, \
2955 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2956 "from JNI") \
2957 \
2958 develop(bool, VerifyFPU, false, \
2959 "Verify FPU state (check for NaN's, etc.)") \
2960 \
2961 develop(bool, VerifyThread, false, \
2962 "Watch the thread register for corruption (SPARC only)") \
2963 \
2964 develop(bool, VerifyActivationFrameSize, false, \
2965 "Verify that activation frame didn't become smaller than its " \
2966 "minimal size") \
2967 \
2968 develop(bool, TraceFrequencyInlining, false, \
2969 "Trace frequency based inlining") \
2970 \
2971 develop_pd(bool, InlineIntrinsics, \
2972 "Inline intrinsics that can be statically resolved") \
2973 \
2974 product_pd(bool, ProfileInterpreter, \
2975 "Profile at the bytecode level during interpretation") \
2976 \
2977 develop(bool, TraceProfileInterpreter, false, \
2978 "Trace profiling at the bytecode level during interpretation. " \
2979 "This outputs the profiling information collected to improve " \
2980 "jit compilation.") \
2981 \
2982 develop_pd(bool, ProfileTraps, \
2983 "Profile deoptimization traps at the bytecode level") \
2984 \
2985 product(intx, ProfileMaturityPercentage, 20, \
2986 "number of method invocations/branches (expressed as % of " \
2987 "CompileThreshold) before using the method's profile") \
2988 range(0, 100) \
2989 \
2990 diagnostic(bool, PrintMethodData, false, \
2991 "Print the results of +ProfileInterpreter at end of run") \
2992 \
2993 develop(bool, VerifyDataPointer, trueInDebug, \
2994 "Verify the method data pointer during interpreter profiling") \
2995 \
2996 develop(bool, VerifyCompiledCode, false, \
2997 "Include miscellaneous runtime verifications in nmethod code; " \
2998 "default off because it disturbs nmethod size heuristics") \
2999 \
3000 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3001 "Manually make GC thread crash then dump java stack trace; " \
3002 "Test only") \
3003 \
3004 /* compilation */ \
3005 product(bool, UseCompiler, true, \
3006 "Use Just-In-Time compilation") \
3007 \
3008 develop(bool, TraceCompilationPolicy, false, \
3009 "Trace compilation policy") \
3010 \
3011 develop(bool, TimeCompilationPolicy, false, \
3012 "Time the compilation policy") \
3013 \
3014 product(bool, UseCounterDecay, true, \
3015 "Adjust recompilation counters") \
3016 \
3017 develop(intx, CounterHalfLifeTime, 30, \
3018 "Half-life time of invocation counters (in seconds)") \
3019 \
3020 develop(intx, CounterDecayMinIntervalLength, 500, \
3021 "The minimum interval (in milliseconds) between invocation of " \
3022 "CounterDecay") \
3023 \
3024 product(bool, AlwaysCompileLoopMethods, false, \
3025 "When using recompilation, never interpret methods " \
3026 "containing loops") \
3027 \
3028 product(bool, DontCompileHugeMethods, true, \
3029 "Do not compile methods > HugeMethodLimit") \
3030 \
3031 /* Bytecode escape analysis estimation. */ \
3032 product(bool, EstimateArgEscape, true, \
3033 "Analyze bytecodes to estimate escape state of arguments") \
3034 \
3035 product(intx, BCEATraceLevel, 0, \
3036 "How much tracing to do of bytecode escape analysis estimates") \
3037 \
3038 product(intx, MaxBCEAEstimateLevel, 5, \
3039 "Maximum number of nested calls that are analyzed by BC EA") \
3040 \
3041 product(intx, MaxBCEAEstimateSize, 150, \
3042 "Maximum bytecode size of a method to be analyzed by BC EA") \
3043 \
3044 product(intx, AllocatePrefetchStyle, 1, \
3045 "0 = no prefetch, " \
3046 "1 = prefetch instructions for each allocation, " \
3047 "2 = use TLAB watermark to gate allocation prefetch, " \
3048 "3 = use BIS instruction on Sparc for allocation prefetch") \
3049 range(0, 3) \
3050 \
3051 product(intx, AllocatePrefetchDistance, -1, \
3052 "Distance to prefetch ahead of allocation pointer") \
3053 \
3054 product(intx, AllocatePrefetchLines, 3, \
3055 "Number of lines to prefetch ahead of array allocation pointer") \
3056 \
3057 product(intx, AllocateInstancePrefetchLines, 1, \
3058 "Number of lines to prefetch ahead of instance allocation " \
3059 "pointer") \
3060 \
3061 product(intx, AllocatePrefetchStepSize, 16, \
3062 "Step size in bytes of sequential prefetch instructions") \
3063 \
3064 product(intx, AllocatePrefetchInstr, 0, \
3065 "Prefetch instruction to prefetch ahead of allocation pointer") \
3066 \
3067 /* deoptimization */ \
3068 develop(bool, TraceDeoptimization, false, \
3069 "Trace deoptimization") \
3070 \
3071 develop(bool, DebugDeoptimization, false, \
3072 "Tracing various information while debugging deoptimization") \
3073 \
3074 product(intx, SelfDestructTimer, 0, \
3075 "Will cause VM to terminate after a given time (in minutes) " \
3076 "(0 means off)") \
3077 \
3078 product(intx, MaxJavaStackTraceDepth, 1024, \
3079 "The maximum number of lines in the stack trace for Java " \
3080 "exceptions (0 means all)") \
3081 \
3082 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3083 "Guarantee a safepoint (at least) every so many milliseconds " \
3084 "(0 means none)")) \
3085 \
3086 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3087 "Guarantee a safepoint (at least) every so many milliseconds " \
3088 "(0 means none)")) \
3089 \
3090 product(intx, SafepointTimeoutDelay, 10000, \
3091 "Delay in milliseconds for option SafepointTimeout") \
3092 \
3093 product(intx, NmethodSweepActivity, 10, \
3094 "Removes cold nmethods from code cache if > 0. Higher values " \
3095 "result in more aggressive sweeping") \
3096 range(0, 2000) \
3097 \
3098 notproduct(bool, LogSweeper, false, \
3099 "Keep a ring buffer of sweeper activity") \
3100 \
3101 notproduct(intx, SweeperLogEntries, 1024, \
3102 "Number of records in the ring buffer of sweeper activity") \
3103 \
3104 notproduct(intx, MemProfilingInterval, 500, \
3105 "Time between each invocation of the MemProfiler") \
3106 \
3107 develop(intx, MallocCatchPtr, -1, \
3108 "Hit breakpoint when mallocing/freeing this pointer") \
3109 \
3110 notproduct(ccstrlist, SuppressErrorAt, "", \
3111 "List of assertions (file:line) to muzzle") \
3112 \
3113 notproduct(size_t, HandleAllocationLimit, 1024, \
3114 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3115 "is used") \
3116 \
3117 develop(size_t, TotalHandleAllocationLimit, 1024, \
3118 "Threshold for total handle allocation when " \
3119 "+TraceHandleAllocation is used") \
3120 \
3121 develop(intx, StackPrintLimit, 100, \
3122 "number of stack frames to print in VM-level stack dump") \
3123 \
3124 notproduct(intx, MaxElementPrintSize, 256, \
3125 "maximum number of elements to print") \
3126 \
3127 notproduct(intx, MaxSubklassPrintSize, 4, \
3128 "maximum number of subklasses to print when printing klass") \
3129 \
3130 product(intx, MaxInlineLevel, 9, \
3131 "maximum number of nested calls that are inlined") \
3132 \
3133 product(intx, MaxRecursiveInlineLevel, 1, \
3134 "maximum number of nested recursive calls that are inlined") \
3135 \
3136 develop(intx, MaxForceInlineLevel, 100, \
3137 "maximum number of nested calls that are forced for inlining " \
3138 "(using CompileCommand or marked w/ @ForceInline)") \
3139 \
3140 product_pd(intx, InlineSmallCode, \
3141 "Only inline already compiled methods if their code size is " \
3142 "less than this") \
3143 \
3144 product(intx, MaxInlineSize, 35, \
3145 "The maximum bytecode size of a method to be inlined") \
3146 \
3147 product_pd(intx, FreqInlineSize, \
3148 "The maximum bytecode size of a frequent method to be inlined") \
3149 \
3150 product(intx, MaxTrivialSize, 6, \
3151 "The maximum bytecode size of a trivial method to be inlined") \
3152 \
3153 product(intx, MinInliningThreshold, 250, \
3154 "The minimum invocation count a method needs to have to be " \
3155 "inlined") \
3156 \
3157 develop(intx, MethodHistogramCutoff, 100, \
3158 "The cutoff value for method invocation histogram (+CountCalls)") \
3159 \
3160 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3161 "Number of interpreted methods to show in profile") \
3162 \
3163 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3164 "Number of compiled methods to show in profile") \
3165 \
3166 develop(intx, ProfilerNumberOfStubMethods, 25, \
3167 "Number of stub methods to show in profile") \
3168 \
3169 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3170 "Number of runtime stub nodes to show in profile") \
3171 \
3172 product(intx, ProfileIntervalsTicks, 100, \
3173 "Number of ticks between printing of interval profile " \
3174 "(+ProfileIntervals)") \
3175 \
3176 notproduct(intx, ScavengeALotInterval, 1, \
3177 "Interval between which scavenge will occur with +ScavengeALot") \
3178 \
3179 notproduct(intx, FullGCALotInterval, 1, \
3180 "Interval between which full gc will occur with +FullGCALot") \
3181 \
3182 notproduct(intx, FullGCALotStart, 0, \
3183 "For which invocation to start FullGCAlot") \
3184 \
3185 notproduct(intx, FullGCALotDummies, 32*K, \
3186 "Dummy object allocated with +FullGCALot, forcing all objects " \
3187 "to move") \
3188 \
3189 develop(intx, DontYieldALotInterval, 10, \
3190 "Interval between which yields will be dropped (milliseconds)") \
3191 \
3192 develop(intx, MinSleepInterval, 1, \
3193 "Minimum sleep() interval (milliseconds) when " \
3194 "ConvertSleepToYield is off (used for Solaris)") \
3195 \
3196 develop(intx, ProfilerPCTickThreshold, 15, \
3197 "Number of ticks in a PC buckets to be a hotspot") \
3198 \
3199 notproduct(intx, DeoptimizeALotInterval, 5, \
3200 "Number of exits until DeoptimizeALot kicks in") \
3201 \
3202 notproduct(intx, ZombieALotInterval, 5, \
3203 "Number of exits until ZombieALot kicks in") \
3204 \
3205 diagnostic(intx, MallocVerifyInterval, 0, \
3206 "If non-zero, verify C heap after every N calls to " \
3207 "malloc/realloc/free") \
3208 \
3209 diagnostic(intx, MallocVerifyStart, 0, \
3210 "If non-zero, start verifying C heap after Nth call to " \
3211 "malloc/realloc/free") \
3212 \
3213 diagnostic(uintx, MallocMaxTestWords, 0, \
3214 "If non-zero, maximum number of words that malloc/realloc can " \
3215 "allocate (for testing only)") \
3216 \
3217 product(intx, TypeProfileWidth, 2, \
3218 "Number of receiver types to record in call/cast profile") \
3219 \
3220 develop(intx, BciProfileWidth, 2, \
3221 "Number of return bci's to record in ret profile") \
3222 \
3223 product(intx, PerMethodRecompilationCutoff, 400, \
3224 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3225 range(-1, max_intx) \
3226 \
3227 product(intx, PerBytecodeRecompilationCutoff, 200, \
3228 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3229 range(-1, max_intx) \
3230 \
3231 product(intx, PerMethodTrapLimit, 100, \
3232 "Limit on traps (of one kind) in a method (includes inlines)") \
3233 \
3234 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3235 "Limit on speculative traps (of one kind) in a method " \
3236 "(includes inlines)") \
3237 \
3238 product(intx, PerBytecodeTrapLimit, 4, \
3239 "Limit on traps (of one kind) at a particular BCI") \
3240 \
3241 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3242 "Extra method data trap entries for speculation") \
3243 \
3244 develop(intx, InlineFrequencyRatio, 20, \
3245 "Ratio of call site execution to caller method invocation") \
3246 \
3247 develop_pd(intx, InlineFrequencyCount, \
3248 "Count of call site execution necessary to trigger frequent " \
3249 "inlining") \
3250 \
3251 develop(intx, InlineThrowCount, 50, \
3252 "Force inlining of interpreted methods that throw this often") \
3253 \
3254 develop(intx, InlineThrowMaxSize, 200, \
3255 "Force inlining of throwing methods smaller than this") \
3256 \
3257 develop(intx, ProfilerNodeSize, 1024, \
3258 "Size in K to allocate for the Profile Nodes of each thread") \
3259 \
3260 /* gc parameters */ \
3261 product(size_t, InitialHeapSize, 0, \
3262 "Initial heap size (in bytes); zero means use ergonomics") \
3263 \
3264 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3265 "Maximum heap size (in bytes)") \
3266 \
3267 product(size_t, OldSize, ScaleForWordSize(4*M), \
3268 "Initial tenured generation size (in bytes)") \
3269 \
3270 product(size_t, NewSize, ScaleForWordSize(1*M), \
3271 "Initial new generation size (in bytes)") \
3272 \
3273 product(size_t, MaxNewSize, max_uintx, \
3274 "Maximum new generation size (in bytes), max_uintx means set " \
3275 "ergonomically") \
3276 \
3277 product(size_t, PretenureSizeThreshold, 0, \
3278 "Maximum size in bytes of objects allocated in DefNew " \
3279 "generation; zero means no maximum") \
3280 \
3281 product(size_t, TLABSize, 0, \
3282 "Starting TLAB size (in bytes); zero means set ergonomically") \
3283 \
3284 product(size_t, MinTLABSize, 2*K, \
3285 "Minimum allowed TLAB size (in bytes)") \
3286 range(1, max_uintx) \
3287 \
3288 product(uintx, TLABAllocationWeight, 35, \
3289 "Allocation averaging weight") \
3290 range(0, 100) \
3291 \
3292 /* Limit the lower bound of this flag to 1 as it is used */ \
3293 /* in a division expression. */ \
3294 product(uintx, TLABWasteTargetPercent, 1, \
3295 "Percentage of Eden that can be wasted") \
3296 range(1, 100) \
3297 \
3298 product(uintx, TLABRefillWasteFraction, 64, \
3299 "Maximum TLAB waste at a refill (internal fragmentation)") \
3300 range(1, max_uintx) \
3301 \
3302 product(uintx, TLABWasteIncrement, 4, \
3303 "Increment allowed waste at slow allocation") \
3304 \
3305 product(uintx, SurvivorRatio, 8, \
3306 "Ratio of eden/survivor space size") \
3307 \
3308 product(uintx, NewRatio, 2, \
3309 "Ratio of old/new generation sizes") \
3310 \
3311 product_pd(size_t, NewSizeThreadIncrease, \
3312 "Additional size added to desired new generation size per " \
3313 "non-daemon thread (in bytes)") \
3314 \
3315 product_pd(size_t, MetaspaceSize, \
3316 "Initial size of Metaspaces (in bytes)") \
3317 \
3318 product(size_t, MaxMetaspaceSize, max_uintx, \
3319 "Maximum size of Metaspaces (in bytes)") \
3320 \
3321 product(size_t, CompressedClassSpaceSize, 1*G, \
3322 "Maximum size of class area in Metaspace when compressed " \
3323 "class pointers are used") \
3324 range(1*M, 3*G) \
3325 \
3326 manageable(uintx, MinHeapFreeRatio, 40, \
3327 "The minimum percentage of heap free after GC to avoid expansion."\
3328 " For most GCs this applies to the old generation. In G1 and" \
3329 " ParallelGC it applies to the whole heap.") \
3330 range(0, 100) \
3331 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3332 \
3333 manageable(uintx, MaxHeapFreeRatio, 70, \
3334 "The maximum percentage of heap free after GC to avoid shrinking."\
3335 " For most GCs this applies to the old generation. In G1 and" \
3336 " ParallelGC it applies to the whole heap.") \
3337 range(0, 100) \
3338 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3339 \
3340 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3341 "Number of milliseconds per MB of free space in the heap") \
3342 \
3343 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3344 "The minimum change in heap space due to GC (in bytes)") \
3345 \
3346 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3347 "The minimum expansion of Metaspace (in bytes)") \
3348 \
3349 product(uintx, MaxMetaspaceFreeRatio, 70, \
3350 "The maximum percentage of Metaspace free after GC to avoid " \
3351 "shrinking") \
3352 range(0, 100) \
3353 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3354 \
3355 product(uintx, MinMetaspaceFreeRatio, 40, \
3356 "The minimum percentage of Metaspace free after GC to avoid " \
3357 "expansion") \
3358 range(0, 99) \
3359 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3360 \
3361 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3362 "The maximum expansion of Metaspace without full GC (in bytes)") \
3363 \
3364 product(uintx, QueuedAllocationWarningCount, 0, \
3365 "Number of times an allocation that queues behind a GC " \
3366 "will retry before printing a warning") \
3367 \
3368 diagnostic(uintx, VerifyGCStartAt, 0, \
3369 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3370 \
3371 diagnostic(intx, VerifyGCLevel, 0, \
3372 "Generation level at which to start +VerifyBefore/AfterGC") \
3373 \
3374 product(uintx, MaxTenuringThreshold, 15, \
3375 "Maximum value for tenuring threshold") \
3376 range(0, markOopDesc::max_age + 1) \
3377 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3378 \
3379 product(uintx, InitialTenuringThreshold, 7, \
3380 "Initial value for tenuring threshold") \
3381 range(0, markOopDesc::max_age + 1) \
3382 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3383 \
3384 product(uintx, TargetSurvivorRatio, 50, \
3385 "Desired percentage of survivor space used after scavenge") \
3386 range(0, 100) \
3387 \
3388 product(uintx, MarkSweepDeadRatio, 5, \
3389 "Percentage (0-100) of the old gen allowed as dead wood. " \
3390 "Serial mark sweep treats this as both the minimum and maximum " \
3391 "value. " \
3392 "CMS uses this value only if it falls back to mark sweep. " \
3393 "Par compact uses a variable scale based on the density of the " \
3394 "generation and treats this as the maximum value when the heap " \
3395 "is either completely full or completely empty. Par compact " \
3396 "also has a smaller default value; see arguments.cpp.") \
3397 range(0, 100) \
3398 \
3399 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3400 "How often should we fully compact the heap (ignoring the dead " \
3401 "space parameters)") \
3402 range(1, max_uintx) \
3403 \
3404 product(intx, PrintCMSStatistics, 0, \
3405 "Statistics for CMS") \
3406 \
3407 product(bool, PrintCMSInitiationStatistics, false, \
3408 "Statistics for initiating a CMS collection") \
3409 \
3410 product(intx, PrintFLSStatistics, 0, \
3411 "Statistics for CMS' FreeListSpace") \
3412 \
3413 product(intx, PrintFLSCensus, 0, \
3414 "Census for CMS' FreeListSpace") \
3415 \
3416 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3417 "Delay between expansion and allocation (in milliseconds)") \
3418 \
3419 develop(uintx, GCWorkerDelayMillis, 0, \
3420 "Delay in scheduling GC workers (in milliseconds)") \
3421 \
3422 product(intx, DeferThrSuspendLoopCount, 4000, \
3423 "(Unstable) Number of times to iterate in safepoint loop " \
3424 "before blocking VM threads ") \
3425 \
3426 product(intx, DeferPollingPageLoopCount, -1, \
3427 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3428 "before changing safepoint polling page to RO ") \
3429 \
3430 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3431 \
3432 product(bool, PSChunkLargeArrays, true, \
3433 "Process large arrays in chunks") \
3434 \
3435 product(uintx, GCDrainStackTargetSize, 64, \
3436 "Number of entries we will try to leave on the stack " \
3437 "during parallel gc") \
3438 \
3439 /* stack parameters */ \
3440 product_pd(intx, StackYellowPages, \
3441 "Number of yellow zone (recoverable overflows) pages") \
3442 range(1, max_intx) \
3443 \
3444 product_pd(intx, StackRedPages, \
3445 "Number of red zone (unrecoverable overflows) pages") \
3446 range(1, max_intx) \
3447 \
3448 /* greater stack shadow pages can't generate instruction to bang stack */ \
3449 product_pd(intx, StackShadowPages, \
3450 "Number of shadow zone (for overflow checking) pages " \
3451 "this should exceed the depth of the VM and native call stack") \
3452 range(1, 50) \
3453 \
3454 product_pd(intx, ThreadStackSize, \
3455 "Thread Stack Size (in Kbytes)") \
3456 \
3457 product_pd(intx, VMThreadStackSize, \
3458 "Non-Java Thread Stack Size (in Kbytes)") \
3459 \
3460 product_pd(intx, CompilerThreadStackSize, \
3461 "Compiler Thread Stack Size (in Kbytes)") \
3462 \
3463 develop_pd(size_t, JVMInvokeMethodSlack, \
3464 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3465 \
3466 /* code cache parameters */ \
3467 /* ppc64/tiered compilation has large code-entry alignment. */ \
3468 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3469 "Code cache segment size (in bytes) - smallest unit of " \
3470 "allocation") \
3471 range(1, 1024) \
3472 \
3473 develop_pd(intx, CodeEntryAlignment, \
3474 "Code entry alignment for generated code (in bytes)") \
3475 \
3476 product_pd(intx, OptoLoopAlignment, \
3477 "Align inner loops to zero relative to this modulus") \
3478 \
3479 product_pd(uintx, InitialCodeCacheSize, \
3480 "Initial code cache size (in bytes)") \
3481 \
3482 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3483 "Minimum code cache size (in bytes) required to start VM.") \
3484 \
3485 product(bool, SegmentedCodeCache, false, \
3486 "Use a segmented code cache") \
3487 \
3488 product_pd(uintx, ReservedCodeCacheSize, \
3489 "Reserved code cache size (in bytes) - maximum code cache size") \
3490 \
3491 product_pd(uintx, NonProfiledCodeHeapSize, \
3492 "Size of code heap with non-profiled methods (in bytes)") \
3493 \
3494 product_pd(uintx, ProfiledCodeHeapSize, \
3495 "Size of code heap with profiled methods (in bytes)") \
3496 \
3497 product_pd(uintx, NonNMethodCodeHeapSize, \
3498 "Size of code heap with non-nmethods (in bytes)") \
3499 \
3500 product_pd(uintx, CodeCacheExpansionSize, \
3501 "Code cache expansion size (in bytes)") \
3502 \
3503 develop_pd(uintx, CodeCacheMinBlockLength, \
3504 "Minimum number of segments in a code cache block") \
3505 range(1, 100) \
3506 \
3507 notproduct(bool, ExitOnFullCodeCache, false, \
3508 "Exit the VM if we fill the code cache") \
3509 \
3510 product(bool, UseCodeCacheFlushing, true, \
3511 "Remove cold/old nmethods from the code cache") \
3512 \
3513 product(uintx, StartAggressiveSweepingAt, 10, \
3514 "Start aggressive sweeping if X[%] of the code cache is free." \
3515 "Segmented code cache: X[%] of the non-profiled heap." \
3516 "Non-segmented code cache: X[%] of the total code cache") \
3517 range(0, 100) \
3518 \
3519 /* interpreter debugging */ \
3520 develop(intx, BinarySwitchThreshold, 5, \
3521 "Minimal number of lookupswitch entries for rewriting to binary " \
3522 "switch") \
3523 \
3524 develop(intx, StopInterpreterAt, 0, \
3525 "Stop interpreter execution at specified bytecode number") \
3526 \
3527 develop(intx, TraceBytecodesAt, 0, \
3528 "Trace bytecodes starting with specified bytecode number") \
3529 \
3530 /* compiler interface */ \
3531 develop(intx, CIStart, 0, \
3532 "The id of the first compilation to permit") \
3533 \
3534 develop(intx, CIStop, max_jint, \
3535 "The id of the last compilation to permit") \
3536 \
3537 develop(intx, CIStartOSR, 0, \
3538 "The id of the first osr compilation to permit " \
3539 "(CICountOSR must be on)") \
3540 \
3541 develop(intx, CIStopOSR, max_jint, \
3542 "The id of the last osr compilation to permit " \
3543 "(CICountOSR must be on)") \
3544 \
3545 develop(intx, CIBreakAtOSR, -1, \
3546 "The id of osr compilation to break at") \
3547 \
3548 develop(intx, CIBreakAt, -1, \
3549 "The id of compilation to break at") \
3550 \
3551 product(ccstrlist, CompileOnly, "", \
3552 "List of methods (pkg/class.name) to restrict compilation to") \
3553 \
3554 product(ccstr, CompileCommandFile, NULL, \
3555 "Read compiler commands from this file [.hotspot_compiler]") \
3556 \
3557 product(ccstrlist, CompileCommand, "", \
3558 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3559 \
3560 develop(bool, ReplayCompiles, false, \
3561 "Enable replay of compilations from ReplayDataFile") \
3562 \
3563 product(ccstr, ReplayDataFile, NULL, \
3564 "File containing compilation replay information" \
3565 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3566 \
3567 product(ccstr, InlineDataFile, NULL, \
3568 "File containing inlining replay information" \
3569 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3570 \
3571 develop(intx, ReplaySuppressInitializers, 2, \
3572 "Control handling of class initialization during replay: " \
3573 "0 - don't do anything special; " \
3574 "1 - treat all class initializers as empty; " \
3575 "2 - treat class initializers for application classes as empty; " \
3576 "3 - allow all class initializers to run during bootstrap but " \
3577 " pretend they are empty after starting replay") \
3578 range(0, 3) \
3579 \
3580 develop(bool, ReplayIgnoreInitErrors, false, \
3581 "Ignore exceptions thrown during initialization for replay") \
3582 \
3583 product(bool, DumpReplayDataOnError, true, \
3584 "Record replay data for crashing compiler threads") \
3585 \
3586 product(bool, CICompilerCountPerCPU, false, \
3587 "1 compiler thread for log(N CPUs)") \
3588 \
3589 develop(intx, CIFireOOMAt, -1, \
3590 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3591 "(non-negative value throws OOM after this many CI accesses " \
3592 "in each compile)") \
3593 notproduct(intx, CICrashAt, -1, \
3594 "id of compilation to trigger assert in compiler thread for " \
3595 "the purpose of testing, e.g. generation of replay data") \
3596 notproduct(bool, CIObjectFactoryVerify, false, \
3597 "enable potentially expensive verification in ciObjectFactory") \
3598 \
3599 /* Priorities */ \
3600 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3601 \
3602 product(intx, ThreadPriorityPolicy, 0, \
3603 "0 : Normal. "\
3604 " VM chooses priorities that are appropriate for normal "\
3605 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3606 " to normal native priority. Java priorities below " \
3607 " NORM_PRIORITY map to lower native priority values. On "\
3608 " Windows applications are allowed to use higher native "\
3609 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3610 " not use the highest possible native priority, "\
3611 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3612 " system threads. On Linux thread priorities are ignored "\
3613 " because the OS does not support static priority in "\
3614 " SCHED_OTHER scheduling class which is the only choice for "\
3615 " non-root, non-realtime applications. "\
3616 "1 : Aggressive. "\
3617 " Java thread priorities map over to the entire range of "\
3618 " native thread priorities. Higher Java thread priorities map "\
3619 " to higher native thread priorities. This policy should be "\
3620 " used with care, as sometimes it can cause performance "\
3621 " degradation in the application and/or the entire system. On "\
3622 " Linux this policy requires root privilege.") \
3623 range(0, 1) \
3624 \
3625 product(bool, ThreadPriorityVerbose, false, \
3626 "Print priority changes") \
3627 \
3628 product(intx, CompilerThreadPriority, -1, \
3629 "The native priority at which compiler threads should run " \
3630 "(-1 means no change)") \
3631 \
3632 product(intx, VMThreadPriority, -1, \
3633 "The native priority at which the VM thread should run " \
3634 "(-1 means no change)") \
3635 \
3636 product(bool, CompilerThreadHintNoPreempt, true, \
3637 "(Solaris only) Give compiler threads an extra quanta") \
3638 \
3639 product(bool, VMThreadHintNoPreempt, false, \
3640 "(Solaris only) Give VM thread an extra quanta") \
3641 \
3642 product(intx, JavaPriority1_To_OSPriority, -1, \
3643 "Map Java priorities to OS priorities") \
3644 \
3645 product(intx, JavaPriority2_To_OSPriority, -1, \
3646 "Map Java priorities to OS priorities") \
3647 \
3648 product(intx, JavaPriority3_To_OSPriority, -1, \
3649 "Map Java priorities to OS priorities") \
3650 \
3651 product(intx, JavaPriority4_To_OSPriority, -1, \
3652 "Map Java priorities to OS priorities") \
3653 \
3654 product(intx, JavaPriority5_To_OSPriority, -1, \
3655 "Map Java priorities to OS priorities") \
3656 \
3657 product(intx, JavaPriority6_To_OSPriority, -1, \
3658 "Map Java priorities to OS priorities") \
3659 \
3660 product(intx, JavaPriority7_To_OSPriority, -1, \
3661 "Map Java priorities to OS priorities") \
3662 \
3663 product(intx, JavaPriority8_To_OSPriority, -1, \
3664 "Map Java priorities to OS priorities") \
3665 \
3666 product(intx, JavaPriority9_To_OSPriority, -1, \
3667 "Map Java priorities to OS priorities") \
3668 \
3669 product(intx, JavaPriority10_To_OSPriority,-1, \
3670 "Map Java priorities to OS priorities") \
3671 \
3672 experimental(bool, UseCriticalJavaThreadPriority, false, \
3673 "Java thread priority 10 maps to critical scheduling priority") \
3674 \
3675 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3676 "Compiler thread(s) run at critical scheduling priority") \
3677 \
3678 experimental(bool, UseCriticalCMSThreadPriority, false, \
3679 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3680 \
3681 /* compiler debugging */ \
3682 notproduct(intx, CompileTheWorldStartAt, 1, \
3683 "First class to consider when using +CompileTheWorld") \
3684 \
3685 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3686 "Last class to consider when using +CompileTheWorld") \
3687 \
3688 develop(intx, NewCodeParameter, 0, \
3689 "Testing Only: Create a dedicated integer parameter before " \
3690 "putback") \
3691 \
3692 /* new oopmap storage allocation */ \
3693 develop(intx, MinOopMapAllocation, 8, \
3694 "Minimum number of OopMap entries in an OopMapSet") \
3695 \
3696 /* Background Compilation */ \
3697 develop(intx, LongCompileThreshold, 50, \
3698 "Used with +TraceLongCompiles") \
3699 \
3700 /* recompilation */ \
3701 product_pd(intx, CompileThreshold, \
3702 "number of interpreted method invocations before (re-)compiling") \
3703 \
3704 product(double, CompileThresholdScaling, 1.0, \
3705 "Factor to control when first compilation happens " \
3706 "(both with and without tiered compilation): " \
3707 "values greater than 1.0 delay counter overflow, " \
3708 "values between 0 and 1.0 rush counter overflow, " \
3709 "value of 1.0 leaves compilation thresholds unchanged " \
3710 "value of 0.0 is equivalent to -Xint. " \
3711 "" \
3712 "Flag can be set as per-method option. " \
3713 "If a value is specified for a method, compilation thresholds " \
3714 "for that method are scaled by both the value of the global flag "\
3715 "and the value of the per-method flag.") \
3716 \
3717 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3718 "Interpreter (tier 0) invocation notification frequency") \
3719 \
3720 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3721 "C1 without MDO (tier 2) invocation notification frequency") \
3722 \
3723 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3724 "C1 with MDO profiling (tier 3) invocation notification " \
3725 "frequency") \
3726 \
3727 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3728 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3729 \
3730 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3731 "Interpreter (tier 0) invocation notification frequency") \
3732 \
3733 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3734 "C1 without MDO (tier 2) invocation notification frequency") \
3735 \
3736 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3737 "C1 with MDO profiling (tier 3) invocation notification " \
3738 "frequency") \
3739 \
3740 product(intx, Tier2CompileThreshold, 0, \
3741 "threshold at which tier 2 compilation is invoked") \
3742 \
3743 product(intx, Tier2BackEdgeThreshold, 0, \
3744 "Back edge threshold at which tier 2 compilation is invoked") \
3745 \
3746 product(intx, Tier3InvocationThreshold, 200, \
3747 "Compile if number of method invocations crosses this " \
3748 "threshold") \
3749 \
3750 product(intx, Tier3MinInvocationThreshold, 100, \
3751 "Minimum invocation to compile at tier 3") \
3752 \
3753 product(intx, Tier3CompileThreshold, 2000, \
3754 "Threshold at which tier 3 compilation is invoked (invocation " \
3755 "minimum must be satisfied") \
3756 \
3757 product(intx, Tier3BackEdgeThreshold, 60000, \
3758 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3759 \
3760 product(intx, Tier4InvocationThreshold, 5000, \
3761 "Compile if number of method invocations crosses this " \
3762 "threshold") \
3763 \
3764 product(intx, Tier4MinInvocationThreshold, 600, \
3765 "Minimum invocation to compile at tier 4") \
3766 \
3767 product(intx, Tier4CompileThreshold, 15000, \
3768 "Threshold at which tier 4 compilation is invoked (invocation " \
3769 "minimum must be satisfied") \
3770 \
3771 product(intx, Tier4BackEdgeThreshold, 40000, \
3772 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3773 \
3774 product(intx, Tier3DelayOn, 5, \
3775 "If C2 queue size grows over this amount per compiler thread " \
3776 "stop compiling at tier 3 and start compiling at tier 2") \
3777 \
3778 product(intx, Tier3DelayOff, 2, \
3779 "If C2 queue size is less than this amount per compiler thread " \
3780 "allow methods compiled at tier 2 transition to tier 3") \
3781 \
3782 product(intx, Tier3LoadFeedback, 5, \
3783 "Tier 3 thresholds will increase twofold when C1 queue size " \
3784 "reaches this amount per compiler thread") \
3785 \
3786 product(intx, Tier4LoadFeedback, 3, \
3787 "Tier 4 thresholds will increase twofold when C2 queue size " \
3788 "reaches this amount per compiler thread") \
3789 \
3790 product(intx, TieredCompileTaskTimeout, 50, \
3791 "Kill compile task if method was not used within " \
3792 "given timeout in milliseconds") \
3793 \
3794 product(intx, TieredStopAtLevel, 4, \
3795 "Stop at given compilation level") \
3796 \
3797 product(intx, Tier0ProfilingStartPercentage, 200, \
3798 "Start profiling in interpreter if the counters exceed tier 3 " \
3799 "thresholds by the specified percentage") \
3800 \
3801 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3802 "Increase the compile threshold for C1 compilation if the code " \
3803 "cache is filled by the specified percentage") \
3804 range(0, 99) \
3805 \
3806 product(intx, TieredRateUpdateMinTime, 1, \
3807 "Minimum rate sampling interval (in milliseconds)") \
3808 \
3809 product(intx, TieredRateUpdateMaxTime, 25, \
3810 "Maximum rate sampling interval (in milliseconds)") \
3811 \
3812 product_pd(bool, TieredCompilation, \
3813 "Enable tiered compilation") \
3814 \
3815 product(bool, PrintTieredEvents, false, \
3816 "Print tiered events notifications") \
3817 \
3818 product_pd(intx, OnStackReplacePercentage, \
3819 "NON_TIERED number of method invocations/branches (expressed as " \
3820 "% of CompileThreshold) before (re-)compiling OSR code") \
3821 \
3822 product(intx, InterpreterProfilePercentage, 33, \
3823 "NON_TIERED number of method invocations/branches (expressed as " \
3824 "% of CompileThreshold) before profiling in the interpreter") \
3825 range(0, 100) \
3826 \
3827 develop(intx, MaxRecompilationSearchLength, 10, \
3828 "The maximum number of frames to inspect when searching for " \
3829 "recompilee") \
3830 \
3831 develop(intx, MaxInterpretedSearchLength, 3, \
3832 "The maximum number of interpreted frames to skip when searching "\
3833 "for recompilee") \
3834 \
3835 develop(intx, DesiredMethodLimit, 8000, \
3836 "The desired maximum method size (in bytecodes) after inlining") \
3837 \
3838 develop(intx, HugeMethodLimit, 8000, \
3839 "Don't compile methods larger than this if " \
3840 "+DontCompileHugeMethods") \
3841 \
3842 /* New JDK 1.4 reflection implementation */ \
3843 \
3844 develop(intx, FastSuperclassLimit, 8, \
3845 "Depth of hardwired instanceof accelerator array") \
3846 \
3847 /* Properties for Java libraries */ \
3848 \
3849 product(size_t, MaxDirectMemorySize, 0, \
3850 "Maximum total size of NIO direct-buffer allocations") \
3851 \
3852 /* Flags used for temporary code during development */ \
3853 \
3854 diagnostic(bool, UseNewCode, false, \
3855 "Testing Only: Use the new version while testing") \
3856 \
3857 diagnostic(bool, UseNewCode2, false, \
3858 "Testing Only: Use the new version while testing") \
3859 \
3860 diagnostic(bool, UseNewCode3, false, \
3861 "Testing Only: Use the new version while testing") \
3862 \
3863 /* flags for performance data collection */ \
3864 \
3865 product(bool, UsePerfData, falseInEmbedded, \
3866 "Flag to disable jvmstat instrumentation for performance testing "\
3867 "and problem isolation purposes") \
3868 \
3869 product(bool, PerfDataSaveToFile, false, \
3870 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3871 \
3872 product(ccstr, PerfDataSaveFile, NULL, \
3873 "Save PerfData memory to the specified absolute pathname. " \
3874 "The string %p in the file name (if present) " \
3875 "will be replaced by pid") \
3876 \
3877 product(intx, PerfDataSamplingInterval, 50, \
3878 "Data sampling interval (in milliseconds)") \
3879 \
3880 develop(bool, PerfTraceDataCreation, false, \
3881 "Trace creation of Performance Data Entries") \
3882 \
3883 develop(bool, PerfTraceMemOps, false, \
3884 "Trace PerfMemory create/attach/detach calls") \
3885 \
3886 product(bool, PerfDisableSharedMem, false, \
3887 "Store performance data in standard memory") \
3888 \
3889 product(intx, PerfDataMemorySize, 64*K, \
3890 "Size of performance data memory region. Will be rounded " \
3891 "up to a multiple of the native os page size.") \
3892 \
3893 product(intx, PerfMaxStringConstLength, 1024, \
3894 "Maximum PerfStringConstant string length before truncation") \
3895 \
3896 product(bool, PerfAllowAtExitRegistration, false, \
3897 "Allow registration of atexit() methods") \
3898 \
3899 product(bool, PerfBypassFileSystemCheck, false, \
3900 "Bypass Win32 file system criteria checks (Windows Only)") \
3901 \
3902 product(intx, UnguardOnExecutionViolation, 0, \
3903 "Unguard page and retry on no-execute fault (Win32 only) " \
3904 "0=off, 1=conservative, 2=aggressive") \
3905 range(0, 2) \
3906 \
3907 /* Serviceability Support */ \
3908 \
3909 product(bool, ManagementServer, false, \
3910 "Create JMX Management Server") \
3911 \
3912 product(bool, DisableAttachMechanism, false, \
3913 "Disable mechanism that allows tools to attach to this VM") \
3914 \
3915 product(bool, StartAttachListener, false, \
3916 "Always start Attach Listener at VM startup") \
3917 \
3918 manageable(bool, PrintConcurrentLocks, false, \
3919 "Print java.util.concurrent locks in thread dump") \
3920 \
3921 product(bool, TransmitErrorReport, false, \
3922 "Enable error report transmission on erroneous termination") \
3923 \
3924 product(ccstr, ErrorReportServer, NULL, \
3925 "Override built-in error report server address") \
3926 \
3927 /* Shared spaces */ \
3928 \
3929 product(bool, UseSharedSpaces, true, \
3930 "Use shared spaces for metadata") \
3931 \
3932 product(bool, VerifySharedSpaces, false, \
3933 "Verify shared spaces (false for default archive, true for " \
3934 "archive specified by -XX:SharedArchiveFile)") \
3935 \
3936 product(bool, RequireSharedSpaces, false, \
3937 "Require shared spaces for metadata") \
3938 \
3939 product(bool, DumpSharedSpaces, false, \
3940 "Special mode: JVM reads a class list, loads classes, builds " \
3941 "shared spaces, and dumps the shared spaces to a file to be " \
3942 "used in future JVM runs") \
3943 \
3944 product(bool, PrintSharedSpaces, false, \
3945 "Print usage of shared spaces") \
3946 \
3947 product(bool, PrintSharedArchiveAndExit, false, \
3948 "Print shared archive file contents") \
3949 \
3950 product(bool, PrintSharedDictionary, false, \
3951 "If PrintSharedArchiveAndExit is true, also print the shared " \
3952 "dictionary") \
3953 \
3954 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3955 "Size of read-write space for metadata (in bytes)") \
3956 \
3957 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3958 "Size of read-only space for metadata (in bytes)") \
3959 \
3960 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3961 "Size of the shared miscellaneous data area (in bytes)") \
3962 \
3963 product(uintx, SharedMiscCodeSize, 120*K, \
3964 "Size of the shared miscellaneous code area (in bytes)") \
3965 \
3966 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3967 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3968 "Address to allocate shared memory region for class data") \
3969 \
3970 product(uintx, SharedSymbolTableBucketSize, 4, \
3971 "Average number of symbols per bucket in shared table") \
3972 \
3973 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
3974 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3975 "classes. Just exclude them from the shared dictionary.") \
3976 \
3977 diagnostic(bool, PrintMethodHandleStubs, false, \
3978 "Print generated stub code for method handles") \
3979 \
3980 develop(bool, TraceMethodHandles, false, \
3981 "trace internal method handle operations") \
3982 \
3983 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3984 "perform extra checks when constructing method handles") \
3985 \
3986 diagnostic(bool, ShowHiddenFrames, false, \
3987 "show method handle implementation frames (usually hidden)") \
3988 \
3989 experimental(bool, TrustFinalNonStaticFields, false, \
3990 "trust final non-static declarations for constant folding") \
3991 \
3992 diagnostic(bool, FoldStableValues, true, \
3993 "Optimize loads from stable fields (marked w/ @Stable)") \
3994 \
3995 develop(bool, TraceInvokeDynamic, false, \
3996 "trace internal invoke dynamic operations") \
3997 \
3998 diagnostic(bool, PauseAtStartup, false, \
3999 "Causes the VM to pause at startup time and wait for the pause " \
4000 "file to be removed (default: ./vm.paused.<pid>)") \
4001 \
4002 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4003 "The file to create and for whose removal to await when pausing " \
4004 "at startup. (default: ./vm.paused.<pid>)") \
4005 \
4006 diagnostic(bool, PauseAtExit, false, \
4007 "Pause and wait for keypress on exit if a debugger is attached") \
4008 \
4009 product(bool, ExtendedDTraceProbes, false, \
4010 "Enable performance-impacting dtrace probes") \
4011 \
4012 product(bool, DTraceMethodProbes, false, \
4013 "Enable dtrace probes for method-entry and method-exit") \
4014 \
4015 product(bool, DTraceAllocProbes, false, \
4016 "Enable dtrace probes for object allocation") \
4017 \
4018 product(bool, DTraceMonitorProbes, false, \
4019 "Enable dtrace probes for monitor events") \
4020 \
4021 product(bool, RelaxAccessControlCheck, false, \
4022 "Relax the access control checks in the verifier") \
4023 \
4024 product(uintx, StringTableSize, defaultStringTableSize, \
4025 "Number of buckets in the interned String table") \
4026 range(minimumStringTableSize, 111*defaultStringTableSize) \
4027 \
4028 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4029 "Number of buckets in the JVM internal Symbol table") \
4030 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4031 \
4032 product(bool, UseStringDeduplication, false, \
4033 "Use string deduplication") \
4034 \
4035 product(bool, PrintStringDeduplicationStatistics, false, \
4036 "Print string deduplication statistics") \
4037 \
4038 product(uintx, StringDeduplicationAgeThreshold, 3, \
4039 "A string must reach this age (or be promoted to an old region) " \
4040 "to be considered for deduplication") \
4041 range(1, markOopDesc::max_age) \
4042 \
4043 diagnostic(bool, StringDeduplicationResizeALot, false, \
4044 "Force table resize every time the table is scanned") \
4045 \
4046 diagnostic(bool, StringDeduplicationRehashALot, false, \
4047 "Force table rehash every time the table is scanned") \
4048 \
4049 develop(bool, TraceDefaultMethods, false, \
4050 "Trace the default method processing steps") \
4051 \
4052 diagnostic(bool, WhiteBoxAPI, false, \
4053 "Enable internal testing APIs") \
4054 \
4055 product(bool, PrintGCCause, true, \
4056 "Include GC cause in GC logging") \
4057 \
4058 experimental(intx, SurvivorAlignmentInBytes, 0, \
4059 "Default survivor space alignment in bytes") \
4060 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4061 \
4062 product(bool , AllowNonVirtualCalls, false, \
4063 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4064 \
4065 product(ccstr, DumpLoadedClassList, NULL, \
4066 "Dump the names all loaded classes, that could be stored into " \
4067 "the CDS archive, in the specified file") \
4068 \
4069 product(ccstr, SharedClassListFile, NULL, \
4070 "Override the default CDS class list") \
4071 \
4072 diagnostic(ccstr, SharedArchiveFile, NULL, \
4073 "Override the default location of the CDS archive file") \
4074 \
4075 product(ccstr, ExtraSharedClassListFile, NULL, \
4076 "Extra classlist for building the CDS archive file") \
4077 \
4078 experimental(size_t, ArrayAllocatorMallocLimit, \
4079 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4080 "Allocation less than this value will be allocated " \
4081 "using malloc. Larger allocations will use mmap.") \
4082 \
4083 experimental(bool, AlwaysAtomicAccesses, false, \
4084 "Accesses to all variables should always be atomic") \
4085 \
4086 product(bool, EnableTracing, false, \
4087 "Enable event-based tracing") \
4088 \
4089 product(bool, UseLockedTracing, false, \
4090 "Use locked-tracing when doing event-based tracing") \
4091 \
4092 diagnostic(bool, UseUnalignedAccesses, false, \
4093 "Use unaligned memory accesses in sun.misc.Unsafe") \
4094 \
4095 product_pd(bool, PreserveFramePointer, \
4096 "Use the FP register for holding the frame pointer " \
4097 "and not as a general purpose register.") \
4098 \
4099 diagnostic(bool, CheckIntrinsics, true, \
4100 "When a class C is loaded, check that " \
4101 "(1) all intrinsics defined by the VM for class C are present "\
4102 "in the loaded class file and are marked with the " \
4103 "@HotSpotIntrinsicCandidate annotation, that " \
4104 "(2) there is an intrinsic registered for all loaded methods " \
4105 "that are annotated with the @HotSpotIntrinsicCandidate " \
4106 "annotation, and that " \
4107 "(3) no orphan methods exist for class C (i.e., methods for " \
4108 "which the VM declares an intrinsic but that are not declared "\
4109 "in the loaded class C. " \
4110 "Check (3) is available only in debug builds.")
4111
4112 /*
4113 * Macros for factoring of globals
4114 */
4115
4116 // Interface macros
4117 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4118 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4119 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4120 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4121 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4122 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4123 #ifdef PRODUCT
4124 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4125 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4126 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4127 #else
4128 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4129 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4130 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4131 #endif // PRODUCT
4132 // Special LP64 flags, product only needed for now.
4133 #ifdef _LP64
4134 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4135 #else
4136 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4137 #endif // _LP64
4138
4139 // Implementation macros
4140 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4141 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4142 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4143 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4144 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4145 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4146 #ifdef PRODUCT
4147 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4148 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4149 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4150 #else
4151 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4152 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4153 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4154 #endif // PRODUCT
4155 #ifdef _LP64
4156 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4157 #else
4158 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4159 #endif // _LP64
4160
4161 // Only materialize src code for range checking when required, ignore otherwise
4162 #define IGNORE_RANGE(a, b)
4163 // Only materialize src code for contraint checking when required, ignore otherwise
4164 #define IGNORE_CONSTRAINT(func,type)
4165
4166 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4167 DECLARE_PD_DEVELOPER_FLAG, \
4168 DECLARE_PRODUCT_FLAG, \
4169 DECLARE_PD_PRODUCT_FLAG, \
4170 DECLARE_DIAGNOSTIC_FLAG, \
4171 DECLARE_EXPERIMENTAL_FLAG, \
4172 DECLARE_NOTPRODUCT_FLAG, \
4173 DECLARE_MANAGEABLE_FLAG, \
4174 DECLARE_PRODUCT_RW_FLAG, \
4175 DECLARE_LP64_PRODUCT_FLAG, \
4176 IGNORE_RANGE, \
4177 IGNORE_CONSTRAINT)
4178
4179 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4180 DECLARE_PD_DEVELOPER_FLAG, \
4181 DECLARE_PRODUCT_FLAG, \
4182 DECLARE_PD_PRODUCT_FLAG, \
4183 DECLARE_DIAGNOSTIC_FLAG, \
4184 DECLARE_NOTPRODUCT_FLAG, \
4185 IGNORE_RANGE, \
4186 IGNORE_CONSTRAINT)
4187
4188 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4189 DECLARE_PRODUCT_FLAG, \
4190 DECLARE_DIAGNOSTIC_FLAG, \
4191 DECLARE_EXPERIMENTAL_FLAG, \
4192 DECLARE_NOTPRODUCT_FLAG, \
4193 IGNORE_RANGE, \
4194 IGNORE_CONSTRAINT)
4195
4196 // Extensions
4197
4198 #include "runtime/globals_ext.hpp"
4199
4200 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP