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 #include <float.h> // for DBL_MAX
30
31 // use this for flags that are true per default in the tiered build
32 // but false in non-tiered builds, and vice versa
33 #ifdef TIERED
34 #define trueInTiered true
35 #define falseInTiered false
36 #else
37 #define trueInTiered false
38 #define falseInTiered true
39 #endif
40
41 #ifdef TARGET_ARCH_x86
42 # include "globals_x86.hpp"
43 #endif
44 #ifdef TARGET_ARCH_sparc
45 # include "globals_sparc.hpp"
46 #endif
47 #ifdef TARGET_ARCH_zero
48 # include "globals_zero.hpp"
49 #endif
50 #ifdef TARGET_ARCH_arm
51 # include "globals_arm.hpp"
52 #endif
53 #ifdef TARGET_ARCH_ppc
54 # include "globals_ppc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_aarch64
57 # include "globals_aarch64.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_linux
60 # include "globals_linux.hpp"
61 #endif
62 #ifdef TARGET_OS_FAMILY_solaris
63 # include "globals_solaris.hpp"
64 #endif
65 #ifdef TARGET_OS_FAMILY_windows
66 # include "globals_windows.hpp"
67 #endif
68 #ifdef TARGET_OS_FAMILY_aix
69 # include "globals_aix.hpp"
70 #endif
71 #ifdef TARGET_OS_FAMILY_bsd
72 # include "globals_bsd.hpp"
73 #endif
74 #ifdef TARGET_OS_ARCH_linux_x86
75 # include "globals_linux_x86.hpp"
76 #endif
77 #ifdef TARGET_OS_ARCH_linux_sparc
78 # include "globals_linux_sparc.hpp"
79 #endif
80 #ifdef TARGET_OS_ARCH_linux_zero
81 # include "globals_linux_zero.hpp"
82 #endif
83 #ifdef TARGET_OS_ARCH_solaris_x86
84 # include "globals_solaris_x86.hpp"
85 #endif
86 #ifdef TARGET_OS_ARCH_solaris_sparc
87 # include "globals_solaris_sparc.hpp"
88 #endif
89 #ifdef TARGET_OS_ARCH_windows_x86
90 # include "globals_windows_x86.hpp"
91 #endif
92 #ifdef TARGET_OS_ARCH_linux_arm
93 # include "globals_linux_arm.hpp"
94 #endif
95 #ifdef TARGET_OS_ARCH_linux_ppc
96 # include "globals_linux_ppc.hpp"
97 #endif
98 #ifdef TARGET_OS_ARCH_linux_aarch64
99 # include "globals_linux_aarch64.hpp"
100 #endif
101 #ifdef TARGET_OS_ARCH_aix_ppc
102 # include "globals_aix_ppc.hpp"
103 #endif
104 #ifdef TARGET_OS_ARCH_bsd_x86
105 # include "globals_bsd_x86.hpp"
106 #endif
107 #ifdef TARGET_OS_ARCH_bsd_zero
108 # include "globals_bsd_zero.hpp"
109 #endif
110 #ifdef COMPILER1
111 #ifdef TARGET_ARCH_x86
112 # include "c1_globals_x86.hpp"
113 #endif
114 #ifdef TARGET_ARCH_sparc
115 # include "c1_globals_sparc.hpp"
116 #endif
117 #ifdef TARGET_ARCH_arm
118 # include "c1_globals_arm.hpp"
119 #endif
120 #ifdef TARGET_ARCH_aarch64
121 # include "c1_globals_aarch64.hpp"
122 #endif
123 #ifdef TARGET_OS_FAMILY_linux
124 # include "c1_globals_linux.hpp"
125 #endif
126 #ifdef TARGET_OS_FAMILY_solaris
127 # include "c1_globals_solaris.hpp"
128 #endif
129 #ifdef TARGET_OS_FAMILY_windows
130 # include "c1_globals_windows.hpp"
131 #endif
132 #ifdef TARGET_OS_FAMILY_aix
133 # include "c1_globals_aix.hpp"
134 #endif
135 #ifdef TARGET_OS_FAMILY_bsd
136 # include "c1_globals_bsd.hpp"
137 #endif
138 #ifdef TARGET_ARCH_ppc
139 # include "c1_globals_ppc.hpp"
140 #endif
141 #endif
142 #ifdef COMPILER2
143 #ifdef TARGET_ARCH_x86
144 # include "c2_globals_x86.hpp"
145 #endif
146 #ifdef TARGET_ARCH_sparc
147 # include "c2_globals_sparc.hpp"
148 #endif
149 #ifdef TARGET_ARCH_arm
150 # include "c2_globals_arm.hpp"
151 #endif
152 #ifdef TARGET_ARCH_ppc
153 # include "c2_globals_ppc.hpp"
154 #endif
155 #ifdef TARGET_ARCH_aarch64
156 # include "c2_globals_aarch64.hpp"
157 #endif
158 #ifdef TARGET_OS_FAMILY_linux
159 # include "c2_globals_linux.hpp"
160 #endif
161 #ifdef TARGET_OS_FAMILY_solaris
162 # include "c2_globals_solaris.hpp"
163 #endif
164 #ifdef TARGET_OS_FAMILY_windows
165 # include "c2_globals_windows.hpp"
166 #endif
167 #ifdef TARGET_OS_FAMILY_aix
168 # include "c2_globals_aix.hpp"
169 #endif
170 #ifdef TARGET_OS_FAMILY_bsd
171 # include "c2_globals_bsd.hpp"
172 #endif
173 #endif
174 #ifdef SHARK
175 #ifdef TARGET_ARCH_zero
176 # include "shark_globals_zero.hpp"
177 #endif
178 #endif
179
180 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
181 define_pd_global(bool, BackgroundCompilation, false);
182 define_pd_global(bool, UseTLAB, false);
183 define_pd_global(bool, CICompileOSR, false);
184 define_pd_global(bool, UseTypeProfile, false);
185 define_pd_global(bool, UseOnStackReplacement, false);
186 define_pd_global(bool, InlineIntrinsics, false);
187 define_pd_global(bool, PreferInterpreterNativeStubs, true);
188 define_pd_global(bool, ProfileInterpreter, false);
189 define_pd_global(bool, ProfileTraps, false);
190 define_pd_global(bool, TieredCompilation, false);
191
192 define_pd_global(intx, CompileThreshold, 0);
193
194 define_pd_global(intx, OnStackReplacePercentage, 0);
195 define_pd_global(bool, ResizeTLAB, false);
196 define_pd_global(intx, FreqInlineSize, 0);
197 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
198 define_pd_global(intx, InlineClassNatives, true);
199 define_pd_global(intx, InlineUnsafeOps, true);
200 define_pd_global(intx, InitialCodeCacheSize, 160*K);
201 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
202 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
203 define_pd_global(intx, ProfiledCodeHeapSize, 0);
204 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
205
206 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
207 define_pd_global(intx, CodeCacheMinBlockLength, 1);
208 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
209 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
210 define_pd_global(bool, NeverActAsServerClassMachine, true);
211 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
212 #define CI_COMPILER_COUNT 0
213 #else
214
215 #ifdef COMPILER2
216 #define CI_COMPILER_COUNT 2
217 #else
218 #define CI_COMPILER_COUNT 1
219 #endif // COMPILER2
220
221 #endif // no compilers
222
223 // string type aliases used only in this file
224 typedef const char* ccstr;
225 typedef const char* ccstrlist; // represents string arguments which accumulate
226
227 struct Flag {
228 enum Flags {
229 // value origin
230 DEFAULT = 0,
231 COMMAND_LINE = 1,
232 ENVIRON_VAR = 2,
233 CONFIG_FILE = 3,
234 MANAGEMENT = 4,
235 ERGONOMIC = 5,
236 ATTACH_ON_DEMAND = 6,
237 INTERNAL = 7,
238
239 LAST_VALUE_ORIGIN = INTERNAL,
240 VALUE_ORIGIN_BITS = 4,
241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
242
243 // flag kind
244 KIND_PRODUCT = 1 << 4,
245 KIND_MANAGEABLE = 1 << 5,
246 KIND_DIAGNOSTIC = 1 << 6,
247 KIND_EXPERIMENTAL = 1 << 7,
248 KIND_NOT_PRODUCT = 1 << 8,
249 KIND_DEVELOP = 1 << 9,
250 KIND_PLATFORM_DEPENDENT = 1 << 10,
251 KIND_READ_WRITE = 1 << 11,
252 KIND_C1 = 1 << 12,
253 KIND_C2 = 1 << 13,
254 KIND_ARCH = 1 << 14,
255 KIND_SHARK = 1 << 15,
256 KIND_LP64_PRODUCT = 1 << 16,
257 KIND_COMMERCIAL = 1 << 17,
258
259 KIND_MASK = ~VALUE_ORIGIN_MASK
260 };
261
262 enum Error {
263 // no error
264 SUCCESS = 0,
265 // flag name is missing
266 MISSING_NAME,
267 // flag value is missing
268 MISSING_VALUE,
269 // error parsing the textual form of the value
270 WRONG_FORMAT,
271 // flag is not writeable
272 NON_WRITABLE,
273 // flag value is outside of its bounds
274 OUT_OF_BOUNDS,
275 // flag value violates its constraint
276 VIOLATES_CONSTRAINT,
277 // there is no flag with the given name
278 INVALID_FLAG,
279 // other, unspecified error related to setting the flag
280 ERR_OTHER
281 };
282
283 const char* _type;
284 const char* _name;
285 void* _addr;
286 NOT_PRODUCT(const char* _doc;)
287 Flags _flags;
288
289 // points to all Flags static array
290 static Flag* flags;
291
292 // number of flags
293 static size_t numFlags;
294
295 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
296 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
297 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
298
299 void check_writable();
300
301 bool is_bool() const;
302 bool get_bool() const;
303 void set_bool(bool value);
304
305 bool is_int() const;
306 int get_int() const;
307 void set_int(int value);
308
309 bool is_uint() const;
310 uint get_uint() const;
311 void set_uint(uint value);
312
313 bool is_intx() const;
314 intx get_intx() const;
315 void set_intx(intx value);
316
317 bool is_uintx() const;
318 uintx get_uintx() const;
319 void set_uintx(uintx value);
320
321 bool is_uint64_t() const;
322 uint64_t get_uint64_t() const;
323 void set_uint64_t(uint64_t value);
324
325 bool is_size_t() const;
326 size_t get_size_t() const;
327 void set_size_t(size_t value);
328
329 bool is_double() const;
330 double get_double() const;
331 void set_double(double value);
332
333 bool is_ccstr() const;
334 bool ccstr_accumulates() const;
335 ccstr get_ccstr() const;
336 void set_ccstr(ccstr value);
337
338 Flags get_origin();
339 void set_origin(Flags origin);
340
341 bool is_default();
342 bool is_ergonomic();
343 bool is_command_line();
344
345 bool is_product() const;
346 bool is_manageable() const;
347 bool is_diagnostic() const;
348 bool is_experimental() const;
349 bool is_notproduct() const;
350 bool is_develop() const;
351 bool is_read_write() const;
352 bool is_commercial() const;
353
354 bool is_constant_in_binary() const;
355
356 bool is_unlocker() const;
357 bool is_unlocked() const;
358 bool is_writeable() const;
359 bool is_external() const;
360
361 bool is_unlocker_ext() const;
362 bool is_unlocked_ext() const;
363 bool is_writeable_ext() const;
364 bool is_external_ext() const;
365
366 void unlock_diagnostic();
367
368 void get_locked_message(char*, int) const;
369 void get_locked_message_ext(char*, int) const;
370
371 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
372 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
373 void print_kind(outputStream* st);
374 void print_as_flag(outputStream* st);
375
376 static const char* flag_error_str(Flag::Error error);
377 };
378
379 // debug flags control various aspects of the VM and are global accessible
380
381 // use FlagSetting to temporarily change some debug flag
382 // e.g. FlagSetting fs(DebugThisAndThat, true);
383 // restored to previous value upon leaving scope
384 class FlagSetting {
385 bool val;
386 bool* flag;
387 public:
388 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
389 ~FlagSetting() { *flag = val; }
390 };
391
392
393 class CounterSetting {
394 intx* counter;
395 public:
396 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
397 ~CounterSetting() { (*counter)--; }
398 };
399
400 class IntFlagSetting {
401 int val;
402 int* flag;
403 public:
404 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
405 ~IntFlagSetting() { *flag = val; }
406 };
407
408 class UIntFlagSetting {
409 uint val;
410 uint* flag;
411 public:
412 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
413 ~UIntFlagSetting() { *flag = val; }
414 };
415
416 class UIntXFlagSetting {
417 uintx val;
418 uintx* flag;
419 public:
420 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
421 ~UIntXFlagSetting() { *flag = val; }
422 };
423
424 class DoubleFlagSetting {
425 double val;
426 double* flag;
427 public:
428 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
429 ~DoubleFlagSetting() { *flag = val; }
430 };
431
432 class SizeTFlagSetting {
433 size_t val;
434 size_t* flag;
435 public:
436 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
437 ~SizeTFlagSetting() { *flag = val; }
438 };
439
440
441 class CommandLineFlags {
442 public:
443 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
444 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); }
445 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
446 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
447
448 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
449 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); }
450 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
451 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
452
453 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
454 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); }
455 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
456 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
457
458 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
459 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); }
460 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
461 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
462
463 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
464 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); }
465 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
466 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
467
468 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
469 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); }
470 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
471 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
472
473 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
474 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); }
475 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
476 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
477
478 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
479 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); }
480 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
481 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
482
483 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
484 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); }
485 // Contract: Flag will make private copy of the incoming value.
486 // Outgoing value is always malloc-ed, and caller MUST call free.
487 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
488 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
489
490 // Returns false if name is not a command line flag.
491 static bool wasSetOnCmdline(const char* name, bool* value);
492 static void printSetFlags(outputStream* out);
493
494 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
495 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
496
497 static void verify() PRODUCT_RETURN;
498 };
499
500 // use this for flags that are true by default in the debug version but
501 // false in the optimized version, and vice versa
502 #ifdef ASSERT
503 #define trueInDebug true
504 #define falseInDebug false
505 #else
506 #define trueInDebug false
507 #define falseInDebug true
508 #endif
509
510 // use this for flags that are true per default in the product build
511 // but false in development builds, and vice versa
512 #ifdef PRODUCT
513 #define trueInProduct true
514 #define falseInProduct false
515 #else
516 #define trueInProduct false
517 #define falseInProduct true
518 #endif
519
520 #ifdef JAVASE_EMBEDDED
521 #define falseInEmbedded false
522 #else
523 #define falseInEmbedded true
524 #endif
525
526 // develop flags are settable / visible only during development and are constant in the PRODUCT version
527 // product flags are always settable / visible
528 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
529
530 // A flag must be declared with one of the following types:
531 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
532 // The type "ccstr" is an alias for "const char*" and is used
533 // only in this file, because the macrology requires single-token type names.
534
535 // Note: Diagnostic options not meant for VM tuning or for product modes.
536 // They are to be used for VM quality assurance or field diagnosis
537 // of VM bugs. They are hidden so that users will not be encouraged to
538 // try them as if they were VM ordinary execution options. However, they
539 // are available in the product version of the VM. Under instruction
540 // from support engineers, VM customers can turn them on to collect
541 // diagnostic information about VM problems. To use a VM diagnostic
542 // option, you must first specify +UnlockDiagnosticVMOptions.
543 // (This master switch also affects the behavior of -Xprintflags.)
544 //
545 // experimental flags are in support of features that are not
546 // part of the officially supported product, but are available
547 // for experimenting with. They could, for example, be performance
548 // features that may not have undergone full or rigorous QA, but which may
549 // help performance in some cases and released for experimentation
550 // by the community of users and developers. This flag also allows one to
551 // be able to build a fully supported product that nonetheless also
552 // ships with some unsupported, lightly tested, experimental features.
553 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
554 // UnlockExperimentalVMOptions flag, which allows the control and
555 // modification of the experimental flags.
556 //
557 // Nota bene: neither diagnostic nor experimental options should be used casually,
558 // and they are not supported on production loads, except under explicit
559 // direction from support engineers.
560 //
561 // manageable flags are writeable external product flags.
562 // They are dynamically writeable through the JDK management interface
563 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
564 // These flags are external exported interface (see CCC). The list of
565 // manageable flags can be queried programmatically through the management
566 // interface.
567 //
568 // A flag can be made as "manageable" only if
569 // - the flag is defined in a CCC as an external exported interface.
570 // - the VM implementation supports dynamic setting of the flag.
571 // This implies that the VM must *always* query the flag variable
572 // and not reuse state related to the flag state at any given time.
573 // - you want the flag to be queried programmatically by the customers.
574 //
575 // product_rw flags are writeable internal product flags.
576 // They are like "manageable" flags but for internal/private use.
577 // The list of product_rw flags are internal/private flags which
578 // may be changed/removed in a future release. It can be set
579 // through the management interface to get/set value
580 // when the name of flag is supplied.
581 //
582 // A flag can be made as "product_rw" only if
583 // - the VM implementation supports dynamic setting of the flag.
584 // This implies that the VM must *always* query the flag variable
585 // and not reuse state related to the flag state at any given time.
586 //
587 // Note that when there is a need to support develop flags to be writeable,
588 // it can be done in the same way as product_rw.
589 //
590 // range is a macro that will expand to min and max arguments for range
591 // checking code if provided - see commandLineFlagRangeList.hpp
592 //
593 // constraint is a macro that will expand to custom function call
594 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
595 //
596
597 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
598 \
599 lp64_product(bool, UseCompressedOops, false, \
600 "Use 32-bit object references in 64-bit VM. " \
601 "lp64_product means flag is always constant in 32 bit VM") \
602 \
603 lp64_product(bool, UseCompressedClassPointers, false, \
604 "Use 32-bit class pointers in 64-bit VM. " \
605 "lp64_product means flag is always constant in 32 bit VM") \
606 \
607 notproduct(bool, CheckCompressedOops, true, \
608 "Generate checks in encoding/decoding code in debug VM") \
609 \
610 product_pd(size_t, HeapBaseMinAddress, \
611 "OS specific low limit for heap base address") \
612 \
613 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
614 "Heap allocation steps through preferred address regions to find" \
615 " where it can allocate the heap. Number of steps to take per " \
616 "region.") \
617 range(1, max_uintx) \
618 \
619 diagnostic(bool, PrintCompressedOopsMode, false, \
620 "Print compressed oops base address and encoding mode") \
621 \
622 lp64_product(intx, ObjectAlignmentInBytes, 8, \
623 "Default object alignment in bytes, 8 is minimum") \
624 range(8, 256) \
625 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
626 \
627 product(bool, AssumeMP, false, \
628 "Instruct the VM to assume multiple processors are available") \
629 \
630 /* UseMembar is theoretically a temp flag used for memory barrier */ \
631 /* removal testing. It was supposed to be removed before FCS but has */ \
632 /* been re-added (see 6401008) */ \
633 product_pd(bool, UseMembar, \
634 "(Unstable) Issues membars on thread state transitions") \
635 \
636 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
637 "Clean the chunk pool asynchronously") \
638 \
639 experimental(bool, AlwaysSafeConstructors, false, \
640 "Force safe construction, as if all fields are final.") \
641 \
642 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
643 "Enable normal processing of flags relating to field diagnostics")\
644 \
645 experimental(bool, UnlockExperimentalVMOptions, false, \
646 "Enable normal processing of flags relating to experimental " \
647 "features") \
648 \
649 product(bool, JavaMonitorsInStackTrace, true, \
650 "Print information about Java monitor locks when the stacks are" \
651 "dumped") \
652 \
653 product_pd(bool, UseLargePages, \
654 "Use large page memory") \
655 \
656 product_pd(bool, UseLargePagesIndividualAllocation, \
657 "Allocate large pages individually for better affinity") \
658 \
659 develop(bool, LargePagesIndividualAllocationInjectError, false, \
660 "Fail large pages individual allocation") \
661 \
662 product(bool, UseLargePagesInMetaspace, false, \
663 "Use large page memory in metaspace. " \
664 "Only used if UseLargePages is enabled.") \
665 \
666 develop(bool, TracePageSizes, false, \
667 "Trace page size selection and usage") \
668 \
669 product(bool, UseNUMA, false, \
670 "Use NUMA if available") \
671 \
672 product(bool, UseNUMAInterleaving, false, \
673 "Interleave memory across NUMA nodes if available") \
674 \
675 product(size_t, NUMAInterleaveGranularity, 2*M, \
676 "Granularity to use for NUMA interleaving on Windows OS") \
677 \
678 product(bool, ForceNUMA, false, \
679 "Force NUMA optimizations on single-node/UMA systems") \
680 \
681 product(uintx, NUMAChunkResizeWeight, 20, \
682 "Percentage (0-100) used to weight the current sample when " \
683 "computing exponentially decaying average for " \
684 "AdaptiveNUMAChunkSizing") \
685 range(0, 100) \
686 \
687 product(size_t, NUMASpaceResizeRate, 1*G, \
688 "Do not reallocate more than this amount per collection") \
689 \
690 product(bool, UseAdaptiveNUMAChunkSizing, true, \
691 "Enable adaptive chunk sizing for NUMA") \
692 \
693 product(bool, NUMAStats, false, \
694 "Print NUMA stats in detailed heap information") \
695 \
696 product(uintx, NUMAPageScanRate, 256, \
697 "Maximum number of pages to include in the page scan procedure") \
698 \
699 product_pd(bool, NeedsDeoptSuspend, \
700 "True for register window machines (sparc/ia64)") \
701 \
702 product(intx, UseSSE, 99, \
703 "Highest supported SSE instructions set on x86/x64") \
704 \
705 product(bool, UseAES, false, \
706 "Control whether AES instructions can be used on x86/x64") \
707 \
708 product(bool, UseSHA, false, \
709 "Control whether SHA instructions can be used " \
710 "on SPARC and on ARM") \
711 \
712 product(bool, UseGHASHIntrinsics, false, \
713 "Use intrinsics for GHASH versions of crypto") \
714 \
715 product(size_t, LargePageSizeInBytes, 0, \
716 "Large page size (0 to let VM choose the page size)") \
717 \
718 product(size_t, LargePageHeapSizeThreshold, 128*M, \
719 "Use large pages if maximum heap is at least this big") \
720 \
721 product(bool, ForceTimeHighResolution, false, \
722 "Using high time resolution (for Win32 only)") \
723 \
724 develop(bool, TraceItables, false, \
725 "Trace initialization and use of itables") \
726 \
727 develop(bool, TracePcPatching, false, \
728 "Trace usage of frame::patch_pc") \
729 \
730 develop(bool, TraceJumps, false, \
731 "Trace assembly jumps in thread ring buffer") \
732 \
733 develop(bool, TraceRelocator, false, \
734 "Trace the bytecode relocator") \
735 \
736 develop(bool, TraceLongCompiles, false, \
737 "Print out every time compilation is longer than " \
738 "a given threshold") \
739 \
740 develop(bool, SafepointALot, false, \
741 "Generate a lot of safepoints. This works with " \
742 "GuaranteedSafepointInterval") \
743 \
744 product_pd(bool, BackgroundCompilation, \
745 "A thread requesting compilation is not blocked during " \
746 "compilation") \
747 \
748 product(bool, PrintVMQWaitTime, false, \
749 "Print out the waiting time in VM operation queue") \
750 \
751 develop(bool, TraceOopMapGeneration, false, \
752 "Show OopMapGeneration") \
753 \
754 product(bool, MethodFlushing, true, \
755 "Reclamation of zombie and not-entrant methods") \
756 \
757 develop(bool, VerifyStack, false, \
758 "Verify stack of each thread when it is entering a runtime call") \
759 \
760 diagnostic(bool, ForceUnreachable, false, \
761 "Make all non code cache addresses to be unreachable by " \
762 "forcing use of 64bit literal fixups") \
763 \
764 notproduct(bool, StressDerivedPointers, false, \
765 "Force scavenge when a derived pointer is detected on stack " \
766 "after rtm call") \
767 \
768 develop(bool, TraceDerivedPointers, false, \
769 "Trace traversal of derived pointers on stack") \
770 \
771 notproduct(bool, TraceCodeBlobStacks, false, \
772 "Trace stack-walk of codeblobs") \
773 \
774 product(bool, PrintJNIResolving, false, \
775 "Used to implement -v:jni") \
776 \
777 notproduct(bool, PrintRewrites, false, \
778 "Print methods that are being rewritten") \
779 \
780 product(bool, UseInlineCaches, true, \
781 "Use Inline Caches for virtual calls ") \
782 \
783 develop(bool, InlineArrayCopy, true, \
784 "Inline arraycopy native that is known to be part of " \
785 "base library DLL") \
786 \
787 develop(bool, InlineObjectHash, true, \
788 "Inline Object::hashCode() native that is known to be part " \
789 "of base library DLL") \
790 \
791 develop(bool, InlineNatives, true, \
792 "Inline natives that are known to be part of base library DLL") \
793 \
794 develop(bool, InlineMathNatives, true, \
795 "Inline SinD, CosD, etc.") \
796 \
797 develop(bool, InlineClassNatives, true, \
798 "Inline Class.isInstance, etc") \
799 \
800 develop(bool, InlineThreadNatives, true, \
801 "Inline Thread.currentThread, etc") \
802 \
803 develop(bool, InlineUnsafeOps, true, \
804 "Inline memory ops (native methods) from sun.misc.Unsafe") \
805 \
806 product(bool, CriticalJNINatives, true, \
807 "Check for critical JNI entry points") \
808 \
809 notproduct(bool, StressCriticalJNINatives, false, \
810 "Exercise register saving code in critical natives") \
811 \
812 product(bool, UseSSE42Intrinsics, false, \
813 "SSE4.2 versions of intrinsics") \
814 \
815 product(bool, UseAESIntrinsics, false, \
816 "Use intrinsics for AES versions of crypto") \
817 \
818 product(bool, UseSHA1Intrinsics, false, \
819 "Use intrinsics for SHA-1 crypto hash function. " \
820 "Requires that UseSHA is enabled.") \
821 \
822 product(bool, UseSHA256Intrinsics, false, \
823 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
824 "Requires that UseSHA is enabled.") \
825 \
826 product(bool, UseSHA512Intrinsics, false, \
827 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
828 "Requires that UseSHA is enabled.") \
829 \
830 product(bool, UseCRC32Intrinsics, false, \
831 "use intrinsics for java.util.zip.CRC32") \
832 \
833 product(bool, UseCRC32CIntrinsics, false, \
834 "use intrinsics for java.util.zip.CRC32C") \
835 \
836 diagnostic(ccstrlist, DisableIntrinsic, "", \
837 "do not expand intrinsics whose (internal) names appear here") \
838 \
839 develop(bool, TraceCallFixup, false, \
840 "Trace all call fixups") \
841 \
842 develop(bool, DeoptimizeALot, false, \
843 "Deoptimize at every exit from the runtime system") \
844 \
845 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
846 "A comma separated list of bcis to deoptimize at") \
847 \
848 product(bool, DeoptimizeRandom, false, \
849 "Deoptimize random frames on random exit from the runtime system")\
850 \
851 notproduct(bool, ZombieALot, false, \
852 "Create zombies (non-entrant) at exit from the runtime system") \
853 \
854 product(bool, UnlinkSymbolsALot, false, \
855 "Unlink unreferenced symbols from the symbol table at safepoints")\
856 \
857 notproduct(bool, WalkStackALot, false, \
858 "Trace stack (no print) at every exit from the runtime system") \
859 \
860 product(bool, Debugging, false, \
861 "Set when executing debug methods in debug.cpp " \
862 "(to prevent triggering assertions)") \
863 \
864 notproduct(bool, StrictSafepointChecks, trueInDebug, \
865 "Enable strict checks that safepoints cannot happen for threads " \
866 "that use No_Safepoint_Verifier") \
867 \
868 notproduct(bool, VerifyLastFrame, false, \
869 "Verify oops on last frame on entry to VM") \
870 \
871 develop(bool, TraceHandleAllocation, false, \
872 "Print out warnings when suspiciously many handles are allocated")\
873 \
874 product(bool, FailOverToOldVerifier, true, \
875 "Fail over to old verifier when split verifier fails") \
876 \
877 develop(bool, ShowSafepointMsgs, false, \
878 "Show message about safepoint synchronization") \
879 \
880 product(bool, SafepointTimeout, false, \
881 "Time out and warn or fail after SafepointTimeoutDelay " \
882 "milliseconds if failed to reach safepoint") \
883 \
884 develop(bool, DieOnSafepointTimeout, false, \
885 "Die upon failure to reach safepoint (see SafepointTimeout)") \
886 \
887 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
888 /* typically, at most a few retries are needed */ \
889 product(intx, SuspendRetryCount, 50, \
890 "Maximum retry count for an external suspend request") \
891 \
892 product(intx, SuspendRetryDelay, 5, \
893 "Milliseconds to delay per retry (* current_retry_count)") \
894 \
895 product(bool, AssertOnSuspendWaitFailure, false, \
896 "Assert/Guarantee on external suspend wait failure") \
897 \
898 product(bool, TraceSuspendWaitFailures, false, \
899 "Trace external suspend wait failures") \
900 \
901 product(bool, MaxFDLimit, true, \
902 "Bump the number of file descriptors to maximum in Solaris") \
903 \
904 diagnostic(bool, LogEvents, true, \
905 "Enable the various ring buffer event logs") \
906 \
907 diagnostic(uintx, LogEventsBufferEntries, 10, \
908 "Number of ring buffer event logs") \
909 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
910 \
911 product(bool, BytecodeVerificationRemote, true, \
912 "Enable the Java bytecode verifier for remote classes") \
913 \
914 product(bool, BytecodeVerificationLocal, false, \
915 "Enable the Java bytecode verifier for local classes") \
916 \
917 develop(bool, ForceFloatExceptions, trueInDebug, \
918 "Force exceptions on FP stack under/overflow") \
919 \
920 develop(bool, VerifyStackAtCalls, false, \
921 "Verify that the stack pointer is unchanged after calls") \
922 \
923 develop(bool, TraceJavaAssertions, false, \
924 "Trace java language assertions") \
925 \
926 notproduct(bool, CheckAssertionStatusDirectives, false, \
927 "Temporary - see javaClasses.cpp") \
928 \
929 notproduct(bool, PrintMallocFree, false, \
930 "Trace calls to C heap malloc/free allocation") \
931 \
932 product(bool, PrintOopAddress, false, \
933 "Always print the location of the oop") \
934 \
935 notproduct(bool, VerifyCodeCache, false, \
936 "Verify code cache on memory allocation/deallocation") \
937 \
938 develop(bool, ZapDeadCompiledLocals, false, \
939 "Zap dead locals in compiler frames") \
940 \
941 notproduct(bool, ZapDeadLocalsOld, false, \
942 "Zap dead locals (old version, zaps all frames when " \
943 "entering the VM") \
944 \
945 notproduct(bool, CheckOopishValues, false, \
946 "Warn if value contains oop (requires ZapDeadLocals)") \
947 \
948 develop(bool, UseMallocOnly, false, \
949 "Use only malloc/free for allocation (no resource area/arena)") \
950 \
951 develop(bool, PrintMalloc, false, \
952 "Print all malloc/free calls") \
953 \
954 develop(bool, PrintMallocStatistics, false, \
955 "Print malloc/free statistics") \
956 \
957 develop(bool, ZapResourceArea, trueInDebug, \
958 "Zap freed resource/arena space with 0xABABABAB") \
959 \
960 notproduct(bool, ZapVMHandleArea, trueInDebug, \
961 "Zap freed VM handle space with 0xBCBCBCBC") \
962 \
963 develop(bool, ZapJNIHandleArea, trueInDebug, \
964 "Zap freed JNI handle space with 0xFEFEFEFE") \
965 \
966 notproduct(bool, ZapStackSegments, trueInDebug, \
967 "Zap allocated/freed stack segments with 0xFADFADED") \
968 \
969 develop(bool, ZapUnusedHeapArea, trueInDebug, \
970 "Zap unused heap space with 0xBAADBABE") \
971 \
972 develop(bool, TraceZapUnusedHeapArea, false, \
973 "Trace zapping of unused heap space") \
974 \
975 develop(bool, CheckZapUnusedHeapArea, false, \
976 "Check zapping of unused heap space") \
977 \
978 develop(bool, ZapFillerObjects, trueInDebug, \
979 "Zap filler objects with 0xDEAFBABE") \
980 \
981 develop(bool, PrintVMMessages, true, \
982 "Print VM messages on console") \
983 \
984 product(bool, PrintGCApplicationConcurrentTime, false, \
985 "Print the time the application has been running") \
986 \
987 product(bool, PrintGCApplicationStoppedTime, false, \
988 "Print the time the application has been stopped") \
989 \
990 diagnostic(bool, VerboseVerification, false, \
991 "Display detailed verification details") \
992 \
993 notproduct(uintx, ErrorHandlerTest, 0, \
994 "If > 0, provokes an error after VM initialization; the value " \
995 "determines which error to provoke. See test_error_handler() " \
996 "in debug.cpp.") \
997 \
998 notproduct(uintx, TestCrashInErrorHandler, 0, \
999 "If > 0, provokes an error inside VM error handler (a secondary " \
1000 "crash). see test_error_handler() in debug.cpp.") \
1001 \
1002 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1003 "If true, tests SafeFetch inside error handler.") \
1004 \
1005 develop(bool, Verbose, false, \
1006 "Print additional debugging information from other modes") \
1007 \
1008 develop(bool, PrintMiscellaneous, false, \
1009 "Print uncategorized debugging information (requires +Verbose)") \
1010 \
1011 develop(bool, WizardMode, false, \
1012 "Print much more debugging information") \
1013 \
1014 product(bool, ShowMessageBoxOnError, false, \
1015 "Keep process alive on VM fatal error") \
1016 \
1017 product(bool, CreateCoredumpOnCrash, true, \
1018 "Create core/mini dump on VM fatal error") \
1019 \
1020 product(uintx, ErrorLogTimeout, 2 * 60, \
1021 "Timeout, in seconds, to limit the time spent on writing an " \
1022 "error log in case of a crash.") \
1023 \
1024 product_pd(bool, UseOSErrorReporting, \
1025 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1026 \
1027 product(bool, SuppressFatalErrorMessage, false, \
1028 "Report NO fatal error message (avoid deadlock)") \
1029 \
1030 product(ccstrlist, OnError, "", \
1031 "Run user-defined commands on fatal error; see VMError.cpp " \
1032 "for examples") \
1033 \
1034 product(ccstrlist, OnOutOfMemoryError, "", \
1035 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1036 \
1037 manageable(bool, HeapDumpBeforeFullGC, false, \
1038 "Dump heap to file before any major stop-the-world GC") \
1039 \
1040 manageable(bool, HeapDumpAfterFullGC, false, \
1041 "Dump heap to file after any major stop-the-world GC") \
1042 \
1043 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1044 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1045 \
1046 manageable(ccstr, HeapDumpPath, NULL, \
1047 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1048 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1049 "in the working directory)") \
1050 \
1051 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1052 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1053 "when the heap usage is larger than this") \
1054 \
1055 develop(size_t, HeapDumpSegmentSize, 1*G, \
1056 "Approximate segment size when generating a segmented heap dump") \
1057 \
1058 develop(bool, BreakAtWarning, false, \
1059 "Execute breakpoint upon encountering VM warning") \
1060 \
1061 develop(bool, TraceVMOperation, false, \
1062 "Trace VM operations") \
1063 \
1064 develop(bool, UseFakeTimers, false, \
1065 "Tell whether the VM should use system time or a fake timer") \
1066 \
1067 product(ccstr, NativeMemoryTracking, "off", \
1068 "Native memory tracking options") \
1069 \
1070 diagnostic(bool, PrintNMTStatistics, false, \
1071 "Print native memory tracking summary data if it is on") \
1072 \
1073 diagnostic(bool, LogCompilation, false, \
1074 "Log compilation activity in detail to LogFile") \
1075 \
1076 product(bool, PrintCompilation, false, \
1077 "Print compilations") \
1078 \
1079 diagnostic(bool, TraceNMethodInstalls, false, \
1080 "Trace nmethod installation") \
1081 \
1082 diagnostic(intx, ScavengeRootsInCode, 2, \
1083 "0: do not allow scavengable oops in the code cache; " \
1084 "1: allow scavenging from the code cache; " \
1085 "2: emit as many constants as the compiler can see") \
1086 range(0, 2) \
1087 \
1088 product(bool, AlwaysRestoreFPU, false, \
1089 "Restore the FPU control word after every JNI call (expensive)") \
1090 \
1091 product(bool, MemoryMapImage, false, \
1092 "Memory map entire runtime image") \
1093 \
1094 diagnostic(bool, PrintCompilation2, false, \
1095 "Print additional statistics per compilation") \
1096 \
1097 diagnostic(bool, PrintAdapterHandlers, false, \
1098 "Print code generated for i2c/c2i adapters") \
1099 \
1100 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1101 "Verify that i2c/c2i adapters are called properly") \
1102 \
1103 develop(bool, VerifyAdapterSharing, false, \
1104 "Verify that the code for shared adapters is the equivalent") \
1105 \
1106 diagnostic(bool, PrintAssembly, false, \
1107 "Print assembly code (using external disassembler.so)") \
1108 \
1109 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1110 "Print options string passed to disassembler.so") \
1111 \
1112 diagnostic(bool, PrintNMethods, false, \
1113 "Print assembly code for nmethods when generated") \
1114 \
1115 diagnostic(bool, PrintNativeNMethods, false, \
1116 "Print assembly code for native nmethods when generated") \
1117 \
1118 develop(bool, PrintDebugInfo, false, \
1119 "Print debug information for all nmethods when generated") \
1120 \
1121 develop(bool, PrintRelocations, false, \
1122 "Print relocation information for all nmethods when generated") \
1123 \
1124 develop(bool, PrintDependencies, false, \
1125 "Print dependency information for all nmethods when generated") \
1126 \
1127 develop(bool, PrintExceptionHandlers, false, \
1128 "Print exception handler tables for all nmethods when generated") \
1129 \
1130 develop(bool, StressCompiledExceptionHandlers, false, \
1131 "Exercise compiled exception handlers") \
1132 \
1133 develop(bool, InterceptOSException, false, \
1134 "Start debugger when an implicit OS (e.g. NULL) " \
1135 "exception happens") \
1136 \
1137 product(bool, PrintCodeCache, false, \
1138 "Print the code cache memory usage when exiting") \
1139 \
1140 develop(bool, PrintCodeCache2, false, \
1141 "Print detailed usage information on the code cache when exiting")\
1142 \
1143 product(bool, PrintCodeCacheOnCompilation, false, \
1144 "Print the code cache memory usage each time a method is " \
1145 "compiled") \
1146 \
1147 diagnostic(bool, PrintStubCode, false, \
1148 "Print generated stub code") \
1149 \
1150 product(bool, StackTraceInThrowable, true, \
1151 "Collect backtrace in throwable when exception happens") \
1152 \
1153 product(bool, OmitStackTraceInFastThrow, true, \
1154 "Omit backtraces for some 'hot' exceptions in optimized code") \
1155 \
1156 product(bool, ProfilerPrintByteCodeStatistics, false, \
1157 "Print bytecode statistics when dumping profiler output") \
1158 \
1159 product(bool, ProfilerRecordPC, false, \
1160 "Collect ticks for each 16 byte interval of compiled code") \
1161 \
1162 product(bool, ProfileVM, false, \
1163 "Profile ticks that fall within VM (either in the VM Thread " \
1164 "or VM code called through stubs)") \
1165 \
1166 product(bool, ProfileIntervals, false, \
1167 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1168 \
1169 notproduct(bool, ProfilerCheckIntervals, false, \
1170 "Collect and print information on spacing of profiler ticks") \
1171 \
1172 product(bool, PrintWarnings, true, \
1173 "Print JVM warnings to output stream") \
1174 \
1175 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1176 "Print warnings for stalled SpinLocks") \
1177 \
1178 product(bool, RegisterFinalizersAtInit, true, \
1179 "Register finalizable objects at end of Object.<init> or " \
1180 "after allocation") \
1181 \
1182 develop(bool, RegisterReferences, true, \
1183 "Tell whether the VM should register soft/weak/final/phantom " \
1184 "references") \
1185 \
1186 develop(bool, IgnoreRewrites, false, \
1187 "Suppress rewrites of bytecodes in the oopmap generator. " \
1188 "This is unsafe!") \
1189 \
1190 develop(bool, PrintCodeCacheExtension, false, \
1191 "Print extension of code cache") \
1192 \
1193 develop(bool, UsePrivilegedStack, true, \
1194 "Enable the security JVM functions") \
1195 \
1196 develop(bool, ProtectionDomainVerification, true, \
1197 "Verify protection domain before resolution in system dictionary")\
1198 \
1199 product(bool, ClassUnloading, true, \
1200 "Do unloading of classes") \
1201 \
1202 product(bool, ClassUnloadingWithConcurrentMark, true, \
1203 "Do unloading of classes with a concurrent marking cycle") \
1204 \
1205 develop(bool, DisableStartThread, false, \
1206 "Disable starting of additional Java threads " \
1207 "(for debugging only)") \
1208 \
1209 develop(bool, MemProfiling, false, \
1210 "Write memory usage profiling to log file") \
1211 \
1212 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1213 "Print the system dictionary at exit") \
1214 \
1215 experimental(intx, PredictedLoadedClassCount, 0, \
1216 "Experimental: Tune loaded class cache starting size") \
1217 \
1218 diagnostic(bool, UnsyncloadClass, false, \
1219 "Unstable: VM calls loadClass unsynchronized. Custom " \
1220 "class loader must call VM synchronized for findClass " \
1221 "and defineClass.") \
1222 \
1223 product(bool, AlwaysLockClassLoader, false, \
1224 "Require the VM to acquire the class loader lock before calling " \
1225 "loadClass() even for class loaders registering " \
1226 "as parallel capable") \
1227 \
1228 product(bool, AllowParallelDefineClass, false, \
1229 "Allow parallel defineClass requests for class loaders " \
1230 "registering as parallel capable") \
1231 \
1232 product(bool, MustCallLoadClassInternal, false, \
1233 "Call loadClassInternal() rather than loadClass()") \
1234 \
1235 product_pd(bool, DontYieldALot, \
1236 "Throw away obvious excess yield calls") \
1237 \
1238 product_pd(bool, ConvertSleepToYield, \
1239 "Convert sleep(0) to thread yield " \
1240 "(may be off for Solaris to improve GUI)") \
1241 \
1242 product(bool, ConvertYieldToSleep, false, \
1243 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1244 "behavior") \
1245 \
1246 develop(bool, UseDetachedThreads, true, \
1247 "Use detached threads that are recycled upon termination " \
1248 "(for Solaris only)") \
1249 \
1250 product(bool, UseLWPSynchronization, true, \
1251 "Use LWP-based instead of libthread-based synchronization " \
1252 "(SPARC only)") \
1253 \
1254 experimental(ccstr, SyncKnobs, NULL, \
1255 "(Unstable) Various monitor synchronization tunables") \
1256 \
1257 experimental(intx, EmitSync, 0, \
1258 "(Unsafe, Unstable) " \
1259 "Control emission of inline sync fast-path code") \
1260 \
1261 product(intx, MonitorBound, 0, "Bound Monitor population") \
1262 \
1263 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1264 \
1265 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1266 "Experimental Sync flags") \
1267 \
1268 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1269 \
1270 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1271 \
1272 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1273 \
1274 experimental(intx, hashCode, 5, \
1275 "(Unstable) select hashCode generation algorithm") \
1276 \
1277 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1278 "(Unstable, Linux-specific) " \
1279 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1280 \
1281 product(bool, FilterSpuriousWakeups, true, \
1282 "When true prevents OS-level spurious, or premature, wakeups " \
1283 "from Object.wait (Ignored for Windows)") \
1284 \
1285 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1286 \
1287 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1288 \
1289 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1290 \
1291 develop(bool, UsePthreads, false, \
1292 "Use pthread-based instead of libthread-based synchronization " \
1293 "(SPARC only)") \
1294 \
1295 product(bool, ReduceSignalUsage, false, \
1296 "Reduce the use of OS signals in Java and/or the VM") \
1297 \
1298 develop_pd(bool, ShareVtableStubs, \
1299 "Share vtable stubs (smaller code but worse branch prediction") \
1300 \
1301 develop(bool, LoadLineNumberTables, true, \
1302 "Tell whether the class file parser loads line number tables") \
1303 \
1304 develop(bool, LoadLocalVariableTables, true, \
1305 "Tell whether the class file parser loads local variable tables") \
1306 \
1307 develop(bool, LoadLocalVariableTypeTables, true, \
1308 "Tell whether the class file parser loads local variable type" \
1309 "tables") \
1310 \
1311 product(bool, AllowUserSignalHandlers, false, \
1312 "Do not complain if the application installs signal handlers " \
1313 "(Solaris & Linux only)") \
1314 \
1315 product(bool, UseSignalChaining, true, \
1316 "Use signal-chaining to invoke signal handlers installed " \
1317 "by the application (Solaris & Linux only)") \
1318 \
1319 product(bool, UseAltSigs, false, \
1320 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1321 "internal signals (Solaris only)") \
1322 \
1323 product(bool, AllowJNIEnvProxy, false, \
1324 "Allow JNIEnv proxies for jdbx") \
1325 \
1326 product(bool, JNIDetachReleasesMonitors, true, \
1327 "JNI DetachCurrentThread releases monitors owned by thread") \
1328 \
1329 product(bool, RestoreMXCSROnJNICalls, false, \
1330 "Restore MXCSR when returning from JNI calls") \
1331 \
1332 product(bool, CheckJNICalls, false, \
1333 "Verify all arguments to JNI calls") \
1334 \
1335 product(bool, CheckEndorsedAndExtDirs, false, \
1336 "Verify the endorsed and extension directories are not used") \
1337 \
1338 product(bool, UseFastJNIAccessors, true, \
1339 "Use optimized versions of Get<Primitive>Field") \
1340 \
1341 product(intx, MaxJNILocalCapacity, 65536, \
1342 "Maximum allowable local JNI handle capacity to " \
1343 "EnsureLocalCapacity() and PushLocalFrame(), " \
1344 "where <= 0 is unlimited, default: 65536") \
1345 \
1346 product(bool, EagerXrunInit, false, \
1347 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1348 "but not all -Xrun libraries may support the state of the VM " \
1349 "at this time") \
1350 \
1351 product(bool, PreserveAllAnnotations, false, \
1352 "Preserve RuntimeInvisibleAnnotations as well " \
1353 "as RuntimeVisibleAnnotations") \
1354 \
1355 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1356 "Number of OutOfMemoryErrors preallocated with backtrace") \
1357 \
1358 product(bool, UseXMMForArrayCopy, false, \
1359 "Use SSE2 MOVQ instruction for Arraycopy") \
1360 \
1361 product(intx, FieldsAllocationStyle, 1, \
1362 "0 - type based with oops first, " \
1363 "1 - with oops last, " \
1364 "2 - oops in super and sub classes are together") \
1365 range(0, 2) \
1366 \
1367 product(bool, CompactFields, true, \
1368 "Allocate nonstatic fields in gaps between previous fields") \
1369 \
1370 notproduct(bool, PrintFieldLayout, false, \
1371 "Print field layout for each class") \
1372 \
1373 /* Need to limit the extent of the padding to reasonable size. */\
1374 /* 8K is well beyond the reasonable HW cache line size, even with */\
1375 /* aggressive prefetching, while still leaving the room for segregating */\
1376 /* among the distinct pages. */\
1377 product(intx, ContendedPaddingWidth, 128, \
1378 "How many bytes to pad the fields/classes marked @Contended with")\
1379 range(0, 8192) \
1380 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \
1381 \
1382 product(bool, EnableContended, true, \
1383 "Enable @Contended annotation support") \
1384 \
1385 product(bool, RestrictContended, true, \
1386 "Restrict @Contended to trusted classes") \
1387 \
1388 product(bool, UseBiasedLocking, true, \
1389 "Enable biased locking in JVM") \
1390 \
1391 product(intx, BiasedLockingStartupDelay, 4000, \
1392 "Number of milliseconds to wait before enabling biased locking") \
1393 \
1394 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1395 "Print statistics of biased locking in JVM") \
1396 \
1397 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1398 "Threshold of number of revocations per type to try to " \
1399 "rebias all objects in the heap of that type") \
1400 \
1401 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1402 "Threshold of number of revocations per type to permanently " \
1403 "revoke biases of all objects in the heap of that type") \
1404 \
1405 product(intx, BiasedLockingDecayTime, 25000, \
1406 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1407 "type after previous bulk rebias") \
1408 \
1409 /* tracing */ \
1410 \
1411 notproduct(bool, TraceRuntimeCalls, false, \
1412 "Trace run-time calls") \
1413 \
1414 develop(bool, TraceJNICalls, false, \
1415 "Trace JNI calls") \
1416 \
1417 develop(bool, StressRewriter, false, \
1418 "Stress linktime bytecode rewriting") \
1419 \
1420 notproduct(bool, TraceJVMCalls, false, \
1421 "Trace JVM calls") \
1422 \
1423 product(ccstr, TraceJVMTI, NULL, \
1424 "Trace flags for JVMTI functions and events") \
1425 \
1426 /* This option can change an EMCP method into an obsolete method. */ \
1427 /* This can affect tests that except specific methods to be EMCP. */ \
1428 /* This option should be used with caution. */ \
1429 product(bool, StressLdcRewrite, false, \
1430 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1431 \
1432 product(intx, TraceRedefineClasses, 0, \
1433 "Trace level for JVMTI RedefineClasses") \
1434 \
1435 /* change to false by default sometime after Mustang */ \
1436 product(bool, VerifyMergedCPBytecodes, true, \
1437 "Verify bytecodes after RedefineClasses constant pool merging") \
1438 \
1439 develop(bool, TraceJNIHandleAllocation, false, \
1440 "Trace allocation/deallocation of JNI handle blocks") \
1441 \
1442 develop(bool, TraceBytecodes, false, \
1443 "Trace bytecode execution") \
1444 \
1445 develop(bool, TraceClassInitialization, false, \
1446 "Trace class initialization") \
1447 \
1448 product(bool, TraceExceptions, false, \
1449 "Trace exceptions") \
1450 \
1451 develop(bool, TraceICs, false, \
1452 "Trace inline cache changes") \
1453 \
1454 notproduct(bool, TraceInvocationCounterOverflow, false, \
1455 "Trace method invocation counter overflow") \
1456 \
1457 develop(bool, TraceInlineCacheClearing, false, \
1458 "Trace clearing of inline caches in nmethods") \
1459 \
1460 develop(bool, TraceDependencies, false, \
1461 "Trace dependencies") \
1462 \
1463 develop(bool, VerifyDependencies, trueInDebug, \
1464 "Exercise and verify the compilation dependency mechanism") \
1465 \
1466 develop(bool, TraceNewOopMapGeneration, false, \
1467 "Trace OopMapGeneration") \
1468 \
1469 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1470 "Trace OopMapGeneration: print detailed cell states") \
1471 \
1472 develop(bool, TimeOopMap, false, \
1473 "Time calls to GenerateOopMap::compute_map() in sum") \
1474 \
1475 develop(bool, TimeOopMap2, false, \
1476 "Time calls to GenerateOopMap::compute_map() individually") \
1477 \
1478 develop(bool, TraceMonitorMismatch, false, \
1479 "Trace monitor matching failures during OopMapGeneration") \
1480 \
1481 develop(bool, TraceOopMapRewrites, false, \
1482 "Trace rewriting of method oops during oop map generation") \
1483 \
1484 develop(bool, TraceSafepoint, false, \
1485 "Trace safepoint operations") \
1486 \
1487 develop(bool, TraceICBuffer, false, \
1488 "Trace usage of IC buffer") \
1489 \
1490 develop(bool, TraceCompiledIC, false, \
1491 "Trace changes of compiled IC") \
1492 \
1493 notproduct(bool, TraceZapDeadLocals, false, \
1494 "Trace zapping dead locals") \
1495 \
1496 develop(bool, TraceStartupTime, false, \
1497 "Trace setup time") \
1498 \
1499 develop(bool, TraceProtectionDomainVerification, false, \
1500 "Trace protection domain verification") \
1501 \
1502 develop(bool, TraceClearedExceptions, false, \
1503 "Print when an exception is forcibly cleared") \
1504 \
1505 product(bool, TraceClassResolution, false, \
1506 "Trace all constant pool resolutions (for debugging)") \
1507 \
1508 product(bool, TraceBiasedLocking, false, \
1509 "Trace biased locking in JVM") \
1510 \
1511 product(bool, TraceMonitorInflation, false, \
1512 "Trace monitor inflation in JVM") \
1513 \
1514 /* gc */ \
1515 \
1516 product(bool, UseSerialGC, false, \
1517 "Use the Serial garbage collector") \
1518 \
1519 product(bool, UseG1GC, false, \
1520 "Use the Garbage-First garbage collector") \
1521 \
1522 product(bool, UseParallelGC, false, \
1523 "Use the Parallel Scavenge garbage collector") \
1524 \
1525 product(bool, UseParallelOldGC, false, \
1526 "Use the Parallel Old garbage collector") \
1527 \
1528 product(uintx, HeapMaximumCompactionInterval, 20, \
1529 "How often should we maximally compact the heap (not allowing " \
1530 "any dead space)") \
1531 \
1532 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1533 "The collection count for the first maximum compaction") \
1534 \
1535 product(bool, UseMaximumCompactionOnSystemGC, true, \
1536 "Use maximum compaction in the Parallel Old garbage collector " \
1537 "for a system GC") \
1538 \
1539 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1540 "The mean used by the parallel compact dead wood " \
1541 "limiter (a number between 0-100)") \
1542 range(0, 100) \
1543 \
1544 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1545 "The standard deviation used by the parallel compact dead wood " \
1546 "limiter (a number between 0-100)") \
1547 range(0, 100) \
1548 \
1549 product(uint, ParallelGCThreads, 0, \
1550 "Number of parallel threads parallel gc will use") \
1551 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1552 \
1553 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1554 "Use semaphore synchronization for the GC Threads, " \
1555 "instead of synchronization based on mutexes") \
1556 \
1557 product(bool, UseDynamicNumberOfGCThreads, false, \
1558 "Dynamically choose the number of parallel threads " \
1559 "parallel gc will use") \
1560 \
1561 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1562 "Force dynamic selection of the number of " \
1563 "parallel threads parallel gc will use to aid debugging") \
1564 \
1565 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1566 "Size of heap (bytes) per GC thread used in calculating the " \
1567 "number of GC threads") \
1568 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1569 \
1570 product(bool, TraceDynamicGCThreads, false, \
1571 "Trace the dynamic GC thread usage") \
1572 \
1573 develop(bool, ParallelOldGCSplitALot, false, \
1574 "Provoke splitting (copying data from a young gen space to " \
1575 "multiple destination spaces)") \
1576 \
1577 develop(uintx, ParallelOldGCSplitInterval, 3, \
1578 "How often to provoke splitting a young gen space") \
1579 range(0, max_uintx) \
1580 \
1581 product(uint, ConcGCThreads, 0, \
1582 "Number of threads concurrent gc will use") \
1583 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1584 \
1585 product(uintx, GCTaskTimeStampEntries, 200, \
1586 "Number of time stamp entries per gc worker thread") \
1587 range(1, max_uintx) \
1588 \
1589 product(bool, AlwaysTenure, false, \
1590 "Always tenure objects in eden (ParallelGC only)") \
1591 \
1592 product(bool, NeverTenure, false, \
1593 "Never tenure objects in eden, may tenure on overflow " \
1594 "(ParallelGC only)") \
1595 \
1596 product(bool, ScavengeBeforeFullGC, true, \
1597 "Scavenge youngest generation before each full GC.") \
1598 \
1599 develop(bool, ScavengeWithObjectsInToSpace, false, \
1600 "Allow scavenges to occur when to-space contains objects") \
1601 \
1602 product(bool, UseConcMarkSweepGC, false, \
1603 "Use Concurrent Mark-Sweep GC in the old generation") \
1604 \
1605 product(bool, ExplicitGCInvokesConcurrent, false, \
1606 "A System.gc() request invokes a concurrent collection; " \
1607 "(effective only when using concurrent collectors)") \
1608 \
1609 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1610 "A System.gc() request invokes a concurrent collection and " \
1611 "also unloads classes during such a concurrent gc cycle " \
1612 "(effective only when UseConcMarkSweepGC)") \
1613 \
1614 product(bool, GCLockerInvokesConcurrent, false, \
1615 "The exit of a JNI critical section necessitating a scavenge, " \
1616 "also kicks off a background concurrent collection") \
1617 \
1618 product(uintx, GCLockerEdenExpansionPercent, 5, \
1619 "How much the GC can expand the eden by while the GC locker " \
1620 "is active (as a percentage)") \
1621 range(0, 100) \
1622 \
1623 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1624 "Number of times to retry allocations when " \
1625 "blocked by the GC locker") \
1626 \
1627 develop(bool, UseCMSAdaptiveFreeLists, true, \
1628 "Use adaptive free lists in the CMS generation") \
1629 \
1630 develop(bool, UseAsyncConcMarkSweepGC, true, \
1631 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1632 \
1633 product(bool, UseCMSBestFit, true, \
1634 "Use CMS best fit allocation strategy") \
1635 \
1636 product(bool, UseParNewGC, false, \
1637 "Use parallel threads in the new generation") \
1638 \
1639 product(bool, PrintTaskqueue, false, \
1640 "Print taskqueue statistics for parallel collectors") \
1641 \
1642 product(bool, PrintTerminationStats, false, \
1643 "Print termination statistics for parallel collectors") \
1644 \
1645 product(uintx, ParallelGCBufferWastePct, 10, \
1646 "Wasted fraction of parallel allocation buffer") \
1647 range(0, 100) \
1648 \
1649 product(uintx, TargetPLABWastePct, 10, \
1650 "Target wasted space in last buffer as percent of overall " \
1651 "allocation") \
1652 range(1, 100) \
1653 \
1654 product(uintx, PLABWeight, 75, \
1655 "Percentage (0-100) used to weight the current sample when " \
1656 "computing exponentially decaying average for ResizePLAB") \
1657 range(0, 100) \
1658 \
1659 product(bool, ResizePLAB, true, \
1660 "Dynamically resize (survivor space) promotion LAB's") \
1661 \
1662 product(bool, PrintPLAB, false, \
1663 "Print (survivor space) promotion LAB's sizing decisions") \
1664 \
1665 product(intx, ParGCArrayScanChunk, 50, \
1666 "Scan a subset of object array and push remainder, if array is " \
1667 "bigger than this") \
1668 range(1, max_intx) \
1669 \
1670 product(bool, ParGCUseLocalOverflow, false, \
1671 "Instead of a global overflow list, use local overflow stacks") \
1672 \
1673 product(bool, ParGCTrimOverflow, true, \
1674 "Eagerly trim the local overflow lists " \
1675 "(when ParGCUseLocalOverflow)") \
1676 \
1677 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1678 "Simulate work queue overflow in ParNew") \
1679 \
1680 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1681 "An `interval' counter that determines how frequently " \
1682 "we simulate overflow; a smaller number increases frequency") \
1683 \
1684 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1685 "The desired number of objects to claim from the overflow list") \
1686 \
1687 diagnostic(uintx, ParGCStridesPerThread, 2, \
1688 "The number of strides per worker thread that we divide up the " \
1689 "card table scanning work into") \
1690 range(1, max_uintx) \
1691 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1692 \
1693 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1694 "The number of cards in each chunk of the parallel chunks used " \
1695 "during card table scanning") \
1696 range(1, max_intx) \
1697 \
1698 product(uintx, OldPLABWeight, 50, \
1699 "Percentage (0-100) used to weight the current sample when " \
1700 "computing exponentially decaying average for resizing " \
1701 "OldPLABSize") \
1702 range(0, 100) \
1703 \
1704 product(bool, ResizeOldPLAB, true, \
1705 "Dynamically resize (old gen) promotion LAB's") \
1706 \
1707 product(bool, PrintOldPLAB, false, \
1708 "Print (old gen) promotion LAB's sizing decisions") \
1709 \
1710 product(size_t, CMSOldPLABMax, 1024, \
1711 "Maximum size of CMS gen promotion LAB caches per worker " \
1712 "per block size") \
1713 range(1, max_uintx) \
1714 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1715 \
1716 product(size_t, CMSOldPLABMin, 16, \
1717 "Minimum size of CMS gen promotion LAB caches per worker " \
1718 "per block size") \
1719 range(1, max_uintx) \
1720 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1721 \
1722 product(uintx, CMSOldPLABNumRefills, 4, \
1723 "Nominal number of refills of CMS gen promotion LAB cache " \
1724 "per worker per block size") \
1725 range(1, max_uintx) \
1726 \
1727 product(bool, CMSOldPLABResizeQuicker, false, \
1728 "React on-the-fly during a scavenge to a sudden " \
1729 "change in block demand rate") \
1730 \
1731 product(uintx, CMSOldPLABToleranceFactor, 4, \
1732 "The tolerance of the phase-change detector for on-the-fly " \
1733 "PLAB resizing during a scavenge") \
1734 range(1, max_uintx) \
1735 \
1736 product(uintx, CMSOldPLABReactivityFactor, 2, \
1737 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1738 "during a scavenge") \
1739 \
1740 product(bool, AlwaysPreTouch, false, \
1741 "Force all freshly committed pages to be pre-touched") \
1742 \
1743 product_pd(size_t, CMSYoungGenPerWorker, \
1744 "The maximum size of young gen chosen by default per GC worker " \
1745 "thread available") \
1746 range(1, max_uintx) \
1747 \
1748 product(uintx, CMSIncrementalSafetyFactor, 10, \
1749 "Percentage (0-100) used to add conservatism when computing the " \
1750 "duty cycle") \
1751 range(0, 100) \
1752 \
1753 product(uintx, CMSExpAvgFactor, 50, \
1754 "Percentage (0-100) used to weight the current sample when " \
1755 "computing exponential averages for CMS statistics") \
1756 range(0, 100) \
1757 \
1758 product(uintx, CMS_FLSWeight, 75, \
1759 "Percentage (0-100) used to weight the current sample when " \
1760 "computing exponentially decaying averages for CMS FLS " \
1761 "statistics") \
1762 range(0, 100) \
1763 \
1764 product(uintx, CMS_FLSPadding, 1, \
1765 "The multiple of deviation from mean to use for buffering " \
1766 "against volatility in free list demand") \
1767 \
1768 product(uintx, FLSCoalescePolicy, 2, \
1769 "CMS: aggressiveness level for coalescing, increasing " \
1770 "from 0 to 4") \
1771 range(0, 4) \
1772 \
1773 product(bool, FLSAlwaysCoalesceLarge, false, \
1774 "CMS: larger free blocks are always available for coalescing") \
1775 \
1776 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1777 "CMS: the smaller the percentage the greater the coalescing " \
1778 "force") \
1779 range(0.0, 1.0) \
1780 \
1781 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1782 "CMS: the factor by which to inflate estimated demand of small " \
1783 "block sizes to prevent coalescing with an adjoining block") \
1784 range(0.0, DBL_MAX) \
1785 \
1786 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1787 "CMS: the factor by which to inflate estimated demand of large " \
1788 "block sizes to prevent coalescing with an adjoining block") \
1789 range(0.0, DBL_MAX) \
1790 \
1791 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1792 "CMS: the factor by which to inflate estimated demand of small " \
1793 "block sizes to prevent splitting to supply demand for smaller " \
1794 "blocks") \
1795 range(0.0, DBL_MAX) \
1796 \
1797 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1798 "CMS: the factor by which to inflate estimated demand of large " \
1799 "block sizes to prevent splitting to supply demand for smaller " \
1800 "blocks") \
1801 range(0.0, DBL_MAX) \
1802 \
1803 product(bool, CMSExtrapolateSweep, false, \
1804 "CMS: cushion for block demand during sweep") \
1805 \
1806 product(uintx, CMS_SweepWeight, 75, \
1807 "Percentage (0-100) used to weight the current sample when " \
1808 "computing exponentially decaying average for inter-sweep " \
1809 "duration") \
1810 range(0, 100) \
1811 \
1812 product(uintx, CMS_SweepPadding, 1, \
1813 "The multiple of deviation from mean to use for buffering " \
1814 "against volatility in inter-sweep duration") \
1815 \
1816 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1817 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1818 "duration exceeds this threshold in milliseconds") \
1819 \
1820 product(bool, CMSClassUnloadingEnabled, true, \
1821 "Whether class unloading enabled when using CMS GC") \
1822 \
1823 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1824 "When CMS class unloading is enabled, the maximum CMS cycle " \
1825 "count for which classes may not be unloaded") \
1826 \
1827 develop(intx, CMSDictionaryChoice, 0, \
1828 "Use BinaryTreeDictionary as default in the CMS generation") \
1829 range(0, 2) \
1830 \
1831 product(uintx, CMSIndexedFreeListReplenish, 4, \
1832 "Replenish an indexed free list with this number of chunks") \
1833 range(1, max_uintx) \
1834 \
1835 product(bool, CMSReplenishIntermediate, true, \
1836 "Replenish all intermediate free-list caches") \
1837 \
1838 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1839 "When satisfying batched demand, split blocks from the " \
1840 "IndexedFreeList whose size is a multiple of requested size") \
1841 \
1842 product(bool, CMSLoopWarn, false, \
1843 "Warn in case of excessive CMS looping") \
1844 \
1845 develop(bool, CMSOverflowEarlyRestoration, false, \
1846 "Restore preserved marks early") \
1847 \
1848 /* where does the range max value of (max_jint - 1) come from? */ \
1849 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1850 "Maximum size of marking stack") \
1851 range(1, (max_jint - 1)) \
1852 \
1853 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1854 "Size of marking stack") \
1855 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1856 \
1857 notproduct(bool, CMSMarkStackOverflowALot, false, \
1858 "Simulate frequent marking stack / work queue overflow") \
1859 \
1860 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1861 "An \"interval\" counter that determines how frequently " \
1862 "to simulate overflow; a smaller number increases frequency") \
1863 \
1864 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1865 "Maximum number of abortable preclean iterations, if > 0") \
1866 \
1867 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1868 "Maximum time in abortable preclean (in milliseconds)") \
1869 range(0, max_intx) \
1870 \
1871 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1872 "Nominal minimum work per abortable preclean iteration") \
1873 \
1874 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1875 "Time that we sleep between iterations when not given " \
1876 "enough work per iteration") \
1877 range(0, max_intx) \
1878 \
1879 product(size_t, CMSRescanMultiple, 32, \
1880 "Size (in cards) of CMS parallel rescan task") \
1881 range(1, max_uintx) \
1882 \
1883 product(size_t, CMSConcMarkMultiple, 32, \
1884 "Size (in cards) of CMS concurrent MT marking task") \
1885 range(1, max_uintx) \
1886 \
1887 product(bool, CMSAbortSemantics, false, \
1888 "Whether abort-on-overflow semantics is implemented") \
1889 \
1890 product(bool, CMSParallelInitialMarkEnabled, true, \
1891 "Use the parallel initial mark.") \
1892 \
1893 product(bool, CMSParallelRemarkEnabled, true, \
1894 "Whether parallel remark enabled (only if ParNewGC)") \
1895 \
1896 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1897 "Whether parallel remark of survivor space " \
1898 "enabled (effective only if CMSParallelRemarkEnabled)") \
1899 \
1900 product(bool, CMSPLABRecordAlways, true, \
1901 "Always record survivor space PLAB boundaries (effective only " \
1902 "if CMSParallelSurvivorRemarkEnabled)") \
1903 \
1904 product(bool, CMSEdenChunksRecordAlways, true, \
1905 "Always record eden chunks used for the parallel initial mark " \
1906 "or remark of eden") \
1907 \
1908 product(bool, CMSPrintEdenSurvivorChunks, false, \
1909 "Print the eden and the survivor chunks used for the parallel " \
1910 "initial mark or remark of the eden/survivor spaces") \
1911 \
1912 product(bool, CMSConcurrentMTEnabled, true, \
1913 "Whether multi-threaded concurrent work enabled " \
1914 "(effective only if ParNewGC)") \
1915 \
1916 product(bool, CMSPrecleaningEnabled, true, \
1917 "Whether concurrent precleaning enabled") \
1918 \
1919 product(uintx, CMSPrecleanIter, 3, \
1920 "Maximum number of precleaning iteration passes") \
1921 range(0, 9) \
1922 \
1923 product(uintx, CMSPrecleanDenominator, 3, \
1924 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1925 "ratio") \
1926 range(1, max_uintx) \
1927 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1928 \
1929 product(uintx, CMSPrecleanNumerator, 2, \
1930 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1931 "ratio") \
1932 range(0, max_uintx-1) \
1933 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1934 \
1935 product(bool, CMSPrecleanRefLists1, true, \
1936 "Preclean ref lists during (initial) preclean phase") \
1937 \
1938 product(bool, CMSPrecleanRefLists2, false, \
1939 "Preclean ref lists during abortable preclean phase") \
1940 \
1941 product(bool, CMSPrecleanSurvivors1, false, \
1942 "Preclean survivors during (initial) preclean phase") \
1943 \
1944 product(bool, CMSPrecleanSurvivors2, true, \
1945 "Preclean survivors during abortable preclean phase") \
1946 \
1947 product(uintx, CMSPrecleanThreshold, 1000, \
1948 "Do not iterate again if number of dirty cards is less than this")\
1949 range(100, max_uintx) \
1950 \
1951 product(bool, CMSCleanOnEnter, true, \
1952 "Clean-on-enter optimization for reducing number of dirty cards") \
1953 \
1954 product(uintx, CMSRemarkVerifyVariant, 1, \
1955 "Choose variant (1,2) of verification following remark") \
1956 range(1, 2) \
1957 \
1958 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1959 "If Eden size is below this, do not try to schedule remark") \
1960 \
1961 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1962 "The Eden occupancy percentage (0-100) at which " \
1963 "to try and schedule remark pause") \
1964 range(0, 100) \
1965 \
1966 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1967 "Start sampling eden top at least before young gen " \
1968 "occupancy reaches 1/<ratio> of the size at which " \
1969 "we plan to schedule remark") \
1970 range(1, max_uintx) \
1971 \
1972 product(uintx, CMSSamplingGrain, 16*K, \
1973 "The minimum distance between eden samples for CMS (see above)") \
1974 range(1, max_uintx) \
1975 \
1976 product(bool, CMSScavengeBeforeRemark, false, \
1977 "Attempt scavenge before the CMS remark step") \
1978 \
1979 develop(bool, CMSTraceSweeper, false, \
1980 "Trace some actions of the CMS sweeper") \
1981 \
1982 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1983 "Don't drain below this size per parallel worker/thief") \
1984 range(0, max_juint) \
1985 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1986 \
1987 manageable(intx, CMSWaitDuration, 2000, \
1988 "Time in milliseconds that CMS thread waits for young GC") \
1989 \
1990 develop(uintx, CMSCheckInterval, 1000, \
1991 "Interval in milliseconds that CMS thread checks if it " \
1992 "should start a collection cycle") \
1993 \
1994 product(bool, CMSYield, true, \
1995 "Yield between steps of CMS") \
1996 \
1997 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1998 "Bitmap operations should process at most this many bits " \
1999 "between yields") \
2000 range(1, max_uintx) \
2001 \
2002 product(bool, CMSDumpAtPromotionFailure, false, \
2003 "Dump useful information about the state of the CMS old " \
2004 "generation upon a promotion failure") \
2005 \
2006 product(bool, CMSPrintChunksInDump, false, \
2007 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2008 "more detailed information about the free chunks") \
2009 \
2010 product(bool, CMSPrintObjectsInDump, false, \
2011 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2012 "more detailed information about the allocated objects") \
2013 \
2014 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
2015 "Verify that all references across the FLS boundary " \
2016 "are to valid objects") \
2017 \
2018 diagnostic(bool, FLSVerifyLists, false, \
2019 "Do lots of (expensive) FreeListSpace verification") \
2020 \
2021 diagnostic(bool, FLSVerifyIndexTable, false, \
2022 "Do lots of (expensive) FLS index table verification") \
2023 \
2024 develop(bool, FLSVerifyDictionary, false, \
2025 "Do lots of (expensive) FLS dictionary verification") \
2026 \
2027 develop(bool, VerifyBlockOffsetArray, false, \
2028 "Do (expensive) block offset array verification") \
2029 \
2030 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2031 "Maintain _unallocated_block in BlockOffsetArray " \
2032 "(currently applicable only to CMS collector)") \
2033 \
2034 develop(bool, TraceCMSState, false, \
2035 "Trace the state of the CMS collection") \
2036 \
2037 product(intx, RefDiscoveryPolicy, 0, \
2038 "Select type of reference discovery policy: " \
2039 "reference-based(0) or referent-based(1)") \
2040 range(ReferenceProcessor::DiscoveryPolicyMin, \
2041 ReferenceProcessor::DiscoveryPolicyMax) \
2042 \
2043 product(bool, ParallelRefProcEnabled, false, \
2044 "Enable parallel reference processing whenever possible") \
2045 \
2046 product(bool, ParallelRefProcBalancingEnabled, true, \
2047 "Enable balancing of reference processing queues") \
2048 \
2049 product(uintx, CMSTriggerRatio, 80, \
2050 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2051 "allocated before a CMS collection cycle commences") \
2052 range(0, 100) \
2053 \
2054 product(uintx, CMSBootstrapOccupancy, 50, \
2055 "Percentage CMS generation occupancy at which to " \
2056 "initiate CMS collection for bootstrapping collection stats") \
2057 range(0, 100) \
2058 \
2059 product(intx, CMSInitiatingOccupancyFraction, -1, \
2060 "Percentage CMS generation occupancy to start a CMS collection " \
2061 "cycle. A negative value means that CMSTriggerRatio is used") \
2062 range(min_intx, 100) \
2063 \
2064 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2065 "Percentage of the (entire) heap occupancy to start a " \
2066 "concurrent GC cycle. It is used by GCs that trigger a " \
2067 "concurrent GC cycle based on the occupancy of the entire heap, " \
2068 "not just one of the generations (e.g., G1). A value of 0 " \
2069 "denotes 'do constant GC cycles'.") \
2070 range(0, 100) \
2071 \
2072 manageable(intx, CMSTriggerInterval, -1, \
2073 "Commence a CMS collection cycle (at least) every so many " \
2074 "milliseconds (0 permanently, -1 disabled)") \
2075 range(-1, max_intx) \
2076 \
2077 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2078 "Only use occupancy as a criterion for starting a CMS collection")\
2079 \
2080 product(uintx, CMSIsTooFullPercentage, 98, \
2081 "An absolute ceiling above which CMS will always consider the " \
2082 "unloading of classes when class unloading is enabled") \
2083 range(0, 100) \
2084 \
2085 develop(bool, CMSTestInFreeList, false, \
2086 "Check if the coalesced range is already in the " \
2087 "free lists as claimed") \
2088 \
2089 notproduct(bool, CMSVerifyReturnedBytes, false, \
2090 "Check that all the garbage collected was returned to the " \
2091 "free lists") \
2092 \
2093 notproduct(bool, ScavengeALot, false, \
2094 "Force scavenge at every Nth exit from the runtime system " \
2095 "(N=ScavengeALotInterval)") \
2096 \
2097 develop(bool, FullGCALot, false, \
2098 "Force full gc at every Nth exit from the runtime system " \
2099 "(N=FullGCALotInterval)") \
2100 \
2101 notproduct(bool, GCALotAtAllSafepoints, false, \
2102 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2103 \
2104 product(bool, PrintPromotionFailure, false, \
2105 "Print additional diagnostic information following " \
2106 "promotion failure") \
2107 \
2108 notproduct(bool, PromotionFailureALot, false, \
2109 "Use promotion failure handling on every youngest generation " \
2110 "collection") \
2111 \
2112 develop(uintx, PromotionFailureALotCount, 1000, \
2113 "Number of promotion failures occurring at PLAB " \
2114 "refill attempts (ParNew) or promotion attempts " \
2115 "(other young collectors)") \
2116 \
2117 develop(uintx, PromotionFailureALotInterval, 5, \
2118 "Total collections between promotion failures a lot") \
2119 \
2120 experimental(uintx, WorkStealingSleepMillis, 1, \
2121 "Sleep time when sleep is used for yields") \
2122 \
2123 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2124 "Number of yields before a sleep is done during work stealing") \
2125 \
2126 experimental(uintx, WorkStealingHardSpins, 4096, \
2127 "Number of iterations in a spin loop between checks on " \
2128 "time out of hard spin") \
2129 \
2130 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2131 "Ratio of hard spins to calls to yield") \
2132 \
2133 develop(uintx, ObjArrayMarkingStride, 512, \
2134 "Number of object array elements to push onto the marking stack " \
2135 "before pushing a continuation entry") \
2136 \
2137 develop(bool, MetadataAllocationFailALot, false, \
2138 "Fail metadata allocations at intervals controlled by " \
2139 "MetadataAllocationFailALotInterval") \
2140 \
2141 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2142 "Metadata allocation failure a lot interval") \
2143 \
2144 develop(bool, TraceMetadataChunkAllocation, false, \
2145 "Trace chunk metadata allocations") \
2146 \
2147 product(bool, TraceMetadataHumongousAllocation, false, \
2148 "Trace humongous metadata allocations") \
2149 \
2150 develop(bool, TraceMetavirtualspaceAllocation, false, \
2151 "Trace virtual space metadata allocations") \
2152 \
2153 notproduct(bool, ExecuteInternalVMTests, false, \
2154 "Enable execution of internal VM tests") \
2155 \
2156 notproduct(bool, VerboseInternalVMTests, false, \
2157 "Turn on logging for internal VM tests.") \
2158 \
2159 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2160 \
2161 product_pd(bool, ResizeTLAB, \
2162 "Dynamically resize TLAB size for threads") \
2163 \
2164 product(bool, ZeroTLAB, false, \
2165 "Zero out the newly created TLAB") \
2166 \
2167 product(bool, FastTLABRefill, true, \
2168 "Use fast TLAB refill code") \
2169 \
2170 product(bool, PrintTLAB, false, \
2171 "Print various TLAB related information") \
2172 \
2173 product(bool, TLABStats, true, \
2174 "Provide more detailed and expensive TLAB statistics " \
2175 "(with PrintTLAB)") \
2176 \
2177 product_pd(bool, NeverActAsServerClassMachine, \
2178 "Never act like a server-class machine") \
2179 \
2180 product(bool, AlwaysActAsServerClassMachine, false, \
2181 "Always act like a server-class machine") \
2182 \
2183 product_pd(uint64_t, MaxRAM, \
2184 "Real memory size (in bytes) used to set maximum heap size") \
2185 \
2186 product(size_t, ErgoHeapSizeLimit, 0, \
2187 "Maximum ergonomically set heap size (in bytes); zero means use " \
2188 "MaxRAM / MaxRAMFraction") \
2189 \
2190 product(uintx, MaxRAMFraction, 4, \
2191 "Maximum fraction (1/n) of real memory used for maximum heap " \
2192 "size") \
2193 range(1, max_uintx) \
2194 \
2195 product(uintx, DefaultMaxRAMFraction, 4, \
2196 "Maximum fraction (1/n) of real memory used for maximum heap " \
2197 "size; deprecated: to be renamed to MaxRAMFraction") \
2198 range(1, max_uintx) \
2199 \
2200 product(uintx, MinRAMFraction, 2, \
2201 "Minimum fraction (1/n) of real memory used for maximum heap " \
2202 "size on systems with small physical memory size") \
2203 range(1, max_uintx) \
2204 \
2205 product(uintx, InitialRAMFraction, 64, \
2206 "Fraction (1/n) of real memory used for initial heap size") \
2207 range(1, max_uintx) \
2208 \
2209 develop(uintx, MaxVirtMemFraction, 2, \
2210 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2211 "determining maximum heap size") \
2212 \
2213 product(bool, UseAutoGCSelectPolicy, false, \
2214 "Use automatic collection selection policy") \
2215 \
2216 product(uintx, AutoGCSelectPauseMillis, 5000, \
2217 "Automatic GC selection pause threshold in milliseconds") \
2218 \
2219 product(bool, UseAdaptiveSizePolicy, true, \
2220 "Use adaptive generation sizing policies") \
2221 \
2222 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2223 "Use adaptive survivor sizing policies") \
2224 \
2225 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2226 "Use adaptive young-old sizing policies at minor collections") \
2227 \
2228 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2229 "Use adaptive young-old sizing policies at major collections") \
2230 \
2231 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2232 "Include statistics from System.gc() for adaptive size policy") \
2233 \
2234 product(bool, UseAdaptiveGCBoundary, false, \
2235 "Allow young-old boundary to move") \
2236 \
2237 develop(bool, TraceAdaptiveGCBoundary, false, \
2238 "Trace young-old boundary moves") \
2239 \
2240 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2241 "Resize the virtual spaces of the young or old generations") \
2242 range(-1, 1) \
2243 \
2244 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2245 "Policy for changing generation size for throughput goals") \
2246 range(0, 1) \
2247 \
2248 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2249 "Adjust tenured generation to achieve a minor pause goal") \
2250 \
2251 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2252 "Adjust young generation to achieve a major pause goal") \
2253 \
2254 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2255 "Number of steps where heuristics is used before data is used") \
2256 \
2257 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2258 "Number of collections before the adaptive sizing is started") \
2259 \
2260 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2261 "Collection interval for printing information; zero means never") \
2262 \
2263 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2264 "Use adaptive minimum footprint as a goal") \
2265 \
2266 product(uintx, AdaptiveSizePolicyWeight, 10, \
2267 "Weight given to exponential resizing, between 0 and 100") \
2268 range(0, 100) \
2269 \
2270 product(uintx, AdaptiveTimeWeight, 25, \
2271 "Weight given to time in adaptive policy, between 0 and 100") \
2272 range(0, 100) \
2273 \
2274 product(uintx, PausePadding, 1, \
2275 "How much buffer to keep for pause time") \
2276 \
2277 product(uintx, PromotedPadding, 3, \
2278 "How much buffer to keep for promotion failure") \
2279 \
2280 product(uintx, SurvivorPadding, 3, \
2281 "How much buffer to keep for survivor overflow") \
2282 \
2283 product(uintx, ThresholdTolerance, 10, \
2284 "Allowed collection cost difference between generations") \
2285 range(0, 100) \
2286 \
2287 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2288 "If collection costs are within margin, reduce both by full " \
2289 "delta") \
2290 \
2291 product(uintx, YoungGenerationSizeIncrement, 20, \
2292 "Adaptive size percentage change in young generation") \
2293 range(0, 100) \
2294 \
2295 product(uintx, YoungGenerationSizeSupplement, 80, \
2296 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2297 range(0, 100) \
2298 \
2299 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2300 "Decay factor to YoungedGenerationSizeSupplement") \
2301 range(1, max_uintx) \
2302 \
2303 product(uintx, TenuredGenerationSizeIncrement, 20, \
2304 "Adaptive size percentage change in tenured generation") \
2305 range(0, 100) \
2306 \
2307 product(uintx, TenuredGenerationSizeSupplement, 80, \
2308 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2309 range(0, 100) \
2310 \
2311 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2312 "Decay factor to TenuredGenerationSizeIncrement") \
2313 range(1, max_uintx) \
2314 \
2315 product(uintx, MaxGCPauseMillis, max_uintx, \
2316 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2317 "or (G1 Only) the maximum GC time per MMU time slice") \
2318 range(1, max_uintx) \
2319 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2320 \
2321 product(uintx, GCPauseIntervalMillis, 0, \
2322 "Time slice for MMU specification") \
2323 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2324 \
2325 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2326 "Adaptive size policy maximum GC minor pause time goal " \
2327 "in millisecond") \
2328 \
2329 product(uintx, GCTimeRatio, 99, \
2330 "Adaptive size policy application time to GC time ratio") \
2331 \
2332 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2333 "Adaptive size scale down factor for shrinking") \
2334 range(1, max_uintx) \
2335 \
2336 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2337 "Adaptive size decays the major cost for long major intervals") \
2338 \
2339 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2340 "Time scale over which major costs decay") \
2341 \
2342 product(uintx, MinSurvivorRatio, 3, \
2343 "Minimum ratio of young generation/survivor space size") \
2344 range(3, max_uintx) \
2345 \
2346 product(uintx, InitialSurvivorRatio, 8, \
2347 "Initial ratio of young generation/survivor space size") \
2348 \
2349 product(size_t, BaseFootPrintEstimate, 256*M, \
2350 "Estimate of footprint other than Java Heap") \
2351 \
2352 product(bool, UseGCOverheadLimit, true, \
2353 "Use policy to limit of proportion of time spent in GC " \
2354 "before an OutOfMemory error is thrown") \
2355 \
2356 product(uintx, GCTimeLimit, 98, \
2357 "Limit of the proportion of time spent in GC before " \
2358 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2359 range(0, 100) \
2360 \
2361 product(uintx, GCHeapFreeLimit, 2, \
2362 "Minimum percentage of free space after a full GC before an " \
2363 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2364 range(0, 100) \
2365 \
2366 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2367 "Number of consecutive collections before gc time limit fires") \
2368 range(1, max_uintx) \
2369 \
2370 product(bool, PrintAdaptiveSizePolicy, false, \
2371 "Print information about AdaptiveSizePolicy") \
2372 \
2373 product(intx, PrefetchCopyIntervalInBytes, -1, \
2374 "How far ahead to prefetch destination area (<= 0 means off)") \
2375 \
2376 product(intx, PrefetchScanIntervalInBytes, -1, \
2377 "How far ahead to prefetch scan area (<= 0 means off)") \
2378 \
2379 product(intx, PrefetchFieldsAhead, -1, \
2380 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2381 \
2382 diagnostic(bool, VerifySilently, false, \
2383 "Do not print the verification progress") \
2384 \
2385 diagnostic(bool, VerifyDuringStartup, false, \
2386 "Verify memory system before executing any Java code " \
2387 "during VM initialization") \
2388 \
2389 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2390 "Verify system before exiting") \
2391 \
2392 diagnostic(bool, VerifyBeforeGC, false, \
2393 "Verify memory system before GC") \
2394 \
2395 diagnostic(bool, VerifyAfterGC, false, \
2396 "Verify memory system after GC") \
2397 \
2398 diagnostic(bool, VerifyDuringGC, false, \
2399 "Verify memory system during GC (between phases)") \
2400 \
2401 diagnostic(bool, GCParallelVerificationEnabled, true, \
2402 "Enable parallel memory system verification") \
2403 \
2404 diagnostic(bool, DeferInitialCardMark, false, \
2405 "When +ReduceInitialCardMarks, explicitly defer any that " \
2406 "may arise from new_pre_store_barrier") \
2407 \
2408 product(bool, UseCondCardMark, false, \
2409 "Check for already marked card before updating card table") \
2410 \
2411 diagnostic(bool, VerifyRememberedSets, false, \
2412 "Verify GC remembered sets") \
2413 \
2414 diagnostic(bool, VerifyObjectStartArray, true, \
2415 "Verify GC object start array if verify before/after") \
2416 \
2417 product(bool, DisableExplicitGC, false, \
2418 "Ignore calls to System.gc()") \
2419 \
2420 notproduct(bool, CheckMemoryInitialization, false, \
2421 "Check memory initialization") \
2422 \
2423 diagnostic(bool, BindCMSThreadToCPU, false, \
2424 "Bind CMS Thread to CPU if possible") \
2425 \
2426 diagnostic(uintx, CPUForCMSThread, 0, \
2427 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2428 \
2429 product(bool, BindGCTaskThreadsToCPUs, false, \
2430 "Bind GCTaskThreads to CPUs if possible") \
2431 \
2432 product(bool, UseGCTaskAffinity, false, \
2433 "Use worker affinity when asking for GCTasks") \
2434 \
2435 product(uintx, ProcessDistributionStride, 4, \
2436 "Stride through processors when distributing processes") \
2437 \
2438 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2439 "Number of times the coordinator GC thread will sleep while " \
2440 "yielding before giving up and resuming GC") \
2441 \
2442 product(uintx, CMSYieldSleepCount, 0, \
2443 "Number of times a GC thread (minus the coordinator) " \
2444 "will sleep while yielding before giving up and resuming GC") \
2445 \
2446 /* gc tracing */ \
2447 manageable(bool, PrintGC, false, \
2448 "Print message at garbage collection") \
2449 \
2450 manageable(bool, PrintGCDetails, false, \
2451 "Print more details at garbage collection") \
2452 \
2453 manageable(bool, PrintGCDateStamps, false, \
2454 "Print date stamps at garbage collection") \
2455 \
2456 manageable(bool, PrintGCTimeStamps, false, \
2457 "Print timestamps at garbage collection") \
2458 \
2459 manageable(bool, PrintGCID, true, \
2460 "Print an identifier for each garbage collection") \
2461 \
2462 product(bool, PrintGCTaskTimeStamps, false, \
2463 "Print timestamps for individual gc worker thread tasks") \
2464 \
2465 develop(intx, ConcGCYieldTimeout, 0, \
2466 "If non-zero, assert that GC threads yield within this " \
2467 "number of milliseconds") \
2468 range(0, max_intx) \
2469 \
2470 product(bool, PrintReferenceGC, false, \
2471 "Print times spent handling reference objects during GC " \
2472 "(enabled only when PrintGCDetails)") \
2473 \
2474 develop(bool, TraceReferenceGC, false, \
2475 "Trace handling of soft/weak/final/phantom references") \
2476 \
2477 develop(bool, TraceFinalizerRegistration, false, \
2478 "Trace registration of final references") \
2479 \
2480 notproduct(bool, TraceScavenge, false, \
2481 "Trace scavenge") \
2482 \
2483 product(bool, IgnoreEmptyClassPaths, false, \
2484 "Ignore empty path elements in -classpath") \
2485 \
2486 product(bool, TraceClassPaths, false, \
2487 "Trace processing of class paths") \
2488 \
2489 product_rw(bool, TraceClassLoading, false, \
2490 "Trace all classes loaded") \
2491 \
2492 product(bool, TraceClassLoadingPreorder, false, \
2493 "Trace all classes loaded in order referenced (not loaded)") \
2494 \
2495 product_rw(bool, TraceClassUnloading, false, \
2496 "Trace unloading of classes") \
2497 \
2498 product_rw(bool, TraceLoaderConstraints, false, \
2499 "Trace loader constraints") \
2500 \
2501 develop(bool, TraceClassLoaderData, false, \
2502 "Trace class loader loader_data lifetime") \
2503 \
2504 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2505 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2506 "Initial size of the boot class loader data metaspace") \
2507 range(BytesPerWord, max_uintx) \
2508 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2509 \
2510 product(bool, TraceYoungGenTime, false, \
2511 "Trace accumulated time for young collection") \
2512 \
2513 product(bool, TraceOldGenTime, false, \
2514 "Trace accumulated time for old collection") \
2515 \
2516 product(bool, PrintTenuringDistribution, false, \
2517 "Print tenuring age information") \
2518 \
2519 product_rw(bool, PrintHeapAtGC, false, \
2520 "Print heap layout before and after each GC") \
2521 \
2522 product_rw(bool, PrintHeapAtGCExtended, false, \
2523 "Print extended information about the layout of the heap " \
2524 "when -XX:+PrintHeapAtGC is set") \
2525 \
2526 product(bool, PrintHeapAtSIGBREAK, true, \
2527 "Print heap layout in response to SIGBREAK") \
2528 \
2529 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2530 "Print a class histogram before any major stop-world GC") \
2531 \
2532 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2533 "Print a class histogram after any major stop-world GC") \
2534 \
2535 manageable(bool, PrintClassHistogram, false, \
2536 "Print a histogram of class instances") \
2537 \
2538 develop(bool, TraceWorkGang, false, \
2539 "Trace activities of work gangs") \
2540 \
2541 product(bool, TraceParallelOldGCTasks, false, \
2542 "Trace multithreaded GC activity") \
2543 \
2544 develop(bool, TraceBlockOffsetTable, false, \
2545 "Print BlockOffsetTable maps") \
2546 \
2547 develop(bool, TraceCardTableModRefBS, false, \
2548 "Print CardTableModRefBS maps") \
2549 \
2550 develop(bool, TraceGCTaskManager, false, \
2551 "Trace actions of the GC task manager") \
2552 \
2553 develop(bool, TraceGCTaskQueue, false, \
2554 "Trace actions of the GC task queues") \
2555 \
2556 diagnostic(bool, TraceGCTaskThread, false, \
2557 "Trace actions of the GC task threads") \
2558 \
2559 product(bool, PrintParallelOldGCPhaseTimes, false, \
2560 "Print the time taken by each phase in ParallelOldGC " \
2561 "(PrintGCDetails must also be enabled)") \
2562 \
2563 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2564 "Trace marking phase in ParallelOldGC") \
2565 \
2566 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2567 "Trace summary phase in ParallelOldGC") \
2568 \
2569 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2570 "Trace compaction phase in ParallelOldGC") \
2571 \
2572 develop(bool, TraceParallelOldGCDensePrefix, false, \
2573 "Trace dense prefix computation for ParallelOldGC") \
2574 \
2575 develop(bool, IgnoreLibthreadGPFault, false, \
2576 "Suppress workaround for libthread GP fault") \
2577 \
2578 product(bool, PrintJNIGCStalls, false, \
2579 "Print diagnostic message when GC is stalled " \
2580 "by JNI critical section") \
2581 \
2582 experimental(double, ObjectCountCutOffPercent, 0.5, \
2583 "The percentage of the used heap that the instances of a class " \
2584 "must occupy for the class to generate a trace event") \
2585 range(0.0, 100.0) \
2586 \
2587 /* GC log rotation setting */ \
2588 \
2589 product(bool, UseGCLogFileRotation, false, \
2590 "Rotate gclog files (for long running applications). It requires "\
2591 "-Xloggc:<filename>") \
2592 \
2593 product(uintx, NumberOfGCLogFiles, 0, \
2594 "Number of gclog files in rotation " \
2595 "(default: 0, no rotation)") \
2596 \
2597 product(size_t, GCLogFileSize, 8*K, \
2598 "GC log file size, requires UseGCLogFileRotation. " \
2599 "Set to 0 to only trigger rotation via jcmd") \
2600 \
2601 /* JVMTI heap profiling */ \
2602 \
2603 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2604 "Trace JVMTI object tagging calls") \
2605 \
2606 diagnostic(bool, VerifyBeforeIteration, false, \
2607 "Verify memory system before JVMTI iteration") \
2608 \
2609 /* compiler interface */ \
2610 \
2611 develop(bool, CIPrintCompilerName, false, \
2612 "when CIPrint is active, print the name of the active compiler") \
2613 \
2614 diagnostic(bool, CIPrintCompileQueue, false, \
2615 "display the contents of the compile queue whenever a " \
2616 "compilation is enqueued") \
2617 \
2618 develop(bool, CIPrintRequests, false, \
2619 "display every request for compilation") \
2620 \
2621 product(bool, CITime, false, \
2622 "collect timing information for compilation") \
2623 \
2624 develop(bool, CITimeVerbose, false, \
2625 "be more verbose in compilation timings") \
2626 \
2627 develop(bool, CITimeEach, false, \
2628 "display timing information after each successful compilation") \
2629 \
2630 develop(bool, CICountOSR, false, \
2631 "use a separate counter when assigning ids to osr compilations") \
2632 \
2633 develop(bool, CICompileNatives, true, \
2634 "compile native methods if supported by the compiler") \
2635 \
2636 develop_pd(bool, CICompileOSR, \
2637 "compile on stack replacement methods if supported by the " \
2638 "compiler") \
2639 \
2640 develop(bool, CIPrintMethodCodes, false, \
2641 "print method bytecodes of the compiled code") \
2642 \
2643 develop(bool, CIPrintTypeFlow, false, \
2644 "print the results of ciTypeFlow analysis") \
2645 \
2646 develop(bool, CITraceTypeFlow, false, \
2647 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2648 \
2649 develop(intx, OSROnlyBCI, -1, \
2650 "OSR only at this bci. Negative values mean exclude that bci") \
2651 \
2652 /* compiler */ \
2653 \
2654 /* notice: the max range value here is max_jint, not max_intx */ \
2655 /* because of overflow issue */ \
2656 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2657 "Number of compiler threads to run") \
2658 range(0, max_jint) \
2659 constraint(CICompilerCountConstraintFunc, AtParse) \
2660 \
2661 product(intx, CompilationPolicyChoice, 0, \
2662 "which compilation policy (0-3)") \
2663 range(0, 3) \
2664 \
2665 develop(bool, UseStackBanging, true, \
2666 "use stack banging for stack overflow checks (required for " \
2667 "proper StackOverflow handling; disable only to measure cost " \
2668 "of stackbanging)") \
2669 \
2670 develop(bool, UseStrictFP, true, \
2671 "use strict fp if modifier strictfp is set") \
2672 \
2673 develop(bool, GenerateSynchronizationCode, true, \
2674 "generate locking/unlocking code for synchronized methods and " \
2675 "monitors") \
2676 \
2677 develop(bool, GenerateCompilerNullChecks, true, \
2678 "Generate explicit null checks for loads/stores/calls") \
2679 \
2680 develop(bool, GenerateRangeChecks, true, \
2681 "Generate range checks for array accesses") \
2682 \
2683 develop_pd(bool, ImplicitNullChecks, \
2684 "Generate code for implicit null checks") \
2685 \
2686 product_pd(bool, TrapBasedNullChecks, \
2687 "Generate code for null checks that uses a cmp and trap " \
2688 "instruction raising SIGTRAP. This is only used if an access to" \
2689 "null (+offset) will not raise a SIGSEGV, i.e.," \
2690 "ImplicitNullChecks don't work (PPC64).") \
2691 \
2692 product(bool, PrintSafepointStatistics, false, \
2693 "Print statistics about safepoint synchronization") \
2694 \
2695 product(intx, PrintSafepointStatisticsCount, 300, \
2696 "Total number of safepoint statistics collected " \
2697 "before printing them out") \
2698 \
2699 product(intx, PrintSafepointStatisticsTimeout, -1, \
2700 "Print safepoint statistics only when safepoint takes " \
2701 "more than PrintSafepointSatisticsTimeout in millis") \
2702 \
2703 product(bool, TraceSafepointCleanupTime, false, \
2704 "Print the break down of clean up tasks performed during " \
2705 "safepoint") \
2706 \
2707 product(bool, Inline, true, \
2708 "Enable inlining") \
2709 \
2710 product(bool, ClipInlining, true, \
2711 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2712 \
2713 develop(bool, UseCHA, true, \
2714 "Enable CHA") \
2715 \
2716 product(bool, UseTypeProfile, true, \
2717 "Check interpreter profile for historically monomorphic calls") \
2718 \
2719 diagnostic(bool, PrintInlining, false, \
2720 "Print inlining optimizations") \
2721 \
2722 product(bool, UsePopCountInstruction, false, \
2723 "Use population count instruction") \
2724 \
2725 develop(bool, EagerInitialization, false, \
2726 "Eagerly initialize classes if possible") \
2727 \
2728 diagnostic(bool, LogTouchedMethods, false, \
2729 "Log methods which have been ever touched in runtime") \
2730 \
2731 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2732 "Print all methods that have been ever touched in runtime") \
2733 \
2734 develop(bool, TraceMethodReplacement, false, \
2735 "Print when methods are replaced do to recompilation") \
2736 \
2737 develop(bool, PrintMethodFlushing, false, \
2738 "Print the nmethods being flushed") \
2739 \
2740 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2741 "print statistics about method flushing") \
2742 \
2743 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2744 "Number of compiled code invocations after which " \
2745 "the method is considered as hot by the flusher") \
2746 \
2747 diagnostic(intx, MinPassesBeforeFlush, 10, \
2748 "Minimum number of sweeper passes before an nmethod " \
2749 "can be flushed") \
2750 \
2751 product(bool, UseCodeAging, true, \
2752 "Insert counter to detect warm methods") \
2753 \
2754 diagnostic(bool, StressCodeAging, false, \
2755 "Start with counters compiled in") \
2756 \
2757 develop(bool, UseRelocIndex, false, \
2758 "Use an index to speed random access to relocations") \
2759 \
2760 develop(bool, StressCodeBuffers, false, \
2761 "Exercise code buffer expansion and other rare state changes") \
2762 \
2763 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2764 "Generate extra debugging information for non-safepoints in " \
2765 "nmethods") \
2766 \
2767 product(bool, PrintVMOptions, false, \
2768 "Print flags that appeared on the command line") \
2769 \
2770 product(bool, IgnoreUnrecognizedVMOptions, false, \
2771 "Ignore unrecognized VM options") \
2772 \
2773 product(bool, PrintCommandLineFlags, false, \
2774 "Print flags specified on command line or set by ergonomics") \
2775 \
2776 product(bool, PrintFlagsInitial, false, \
2777 "Print all VM flags before argument processing and exit VM") \
2778 \
2779 product(bool, PrintFlagsFinal, false, \
2780 "Print all VM flags after argument and ergonomic processing") \
2781 \
2782 notproduct(bool, PrintFlagsWithComments, false, \
2783 "Print all VM flags with default values and descriptions and " \
2784 "exit") \
2785 \
2786 product(bool, PrintFlagsRanges, false, \
2787 "Print VM flags and their ranges and exit VM") \
2788 \
2789 diagnostic(bool, SerializeVMOutput, true, \
2790 "Use a mutex to serialize output to tty and LogFile") \
2791 \
2792 diagnostic(bool, DisplayVMOutput, true, \
2793 "Display all VM output on the tty, independently of LogVMOutput") \
2794 \
2795 diagnostic(bool, LogVMOutput, false, \
2796 "Save VM output to LogFile") \
2797 \
2798 diagnostic(ccstr, LogFile, NULL, \
2799 "If LogVMOutput or LogCompilation is on, save VM output to " \
2800 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2801 \
2802 product(ccstr, ErrorFile, NULL, \
2803 "If an error occurs, save the error data to this file " \
2804 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2805 \
2806 product(bool, DisplayVMOutputToStderr, false, \
2807 "If DisplayVMOutput is true, display all VM output to stderr") \
2808 \
2809 product(bool, DisplayVMOutputToStdout, false, \
2810 "If DisplayVMOutput is true, display all VM output to stdout") \
2811 \
2812 product(bool, UseHeavyMonitors, false, \
2813 "use heavyweight instead of lightweight Java monitors") \
2814 \
2815 product(bool, PrintStringTableStatistics, false, \
2816 "print statistics about the StringTable and SymbolTable") \
2817 \
2818 diagnostic(bool, VerifyStringTableAtExit, false, \
2819 "verify StringTable contents at exit") \
2820 \
2821 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2822 "print histogram of the symbol table") \
2823 \
2824 notproduct(bool, ExitVMOnVerifyError, false, \
2825 "standard exit from VM if bytecode verify error " \
2826 "(only in debug mode)") \
2827 \
2828 notproduct(ccstr, AbortVMOnException, NULL, \
2829 "Call fatal if this exception is thrown. Example: " \
2830 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2831 \
2832 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2833 "Call fatal if the exception pointed by AbortVMOnException " \
2834 "has this message") \
2835 \
2836 develop(bool, DebugVtables, false, \
2837 "add debugging code to vtable dispatch") \
2838 \
2839 develop(bool, PrintVtables, false, \
2840 "print vtables when printing klass") \
2841 \
2842 notproduct(bool, PrintVtableStats, false, \
2843 "print vtables stats at end of run") \
2844 \
2845 develop(bool, TraceCreateZombies, false, \
2846 "trace creation of zombie nmethods") \
2847 \
2848 notproduct(bool, IgnoreLockingAssertions, false, \
2849 "disable locking assertions (for speed)") \
2850 \
2851 product(bool, RangeCheckElimination, true, \
2852 "Eliminate range checks") \
2853 \
2854 develop_pd(bool, UncommonNullCast, \
2855 "track occurrences of null in casts; adjust compiler tactics") \
2856 \
2857 develop(bool, TypeProfileCasts, true, \
2858 "treat casts like calls for purposes of type profiling") \
2859 \
2860 develop(bool, DelayCompilationDuringStartup, true, \
2861 "Delay invoking the compiler until main application class is " \
2862 "loaded") \
2863 \
2864 develop(bool, CompileTheWorld, false, \
2865 "Compile all methods in all classes in bootstrap class path " \
2866 "(stress test)") \
2867 \
2868 develop(bool, CompileTheWorldPreloadClasses, true, \
2869 "Preload all classes used by a class before start loading") \
2870 \
2871 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2872 "Force a safepoint every n compiles so sweeper can keep up") \
2873 \
2874 develop(bool, FillDelaySlots, true, \
2875 "Fill delay slots (on SPARC only)") \
2876 \
2877 develop(bool, TimeLivenessAnalysis, false, \
2878 "Time computation of bytecode liveness analysis") \
2879 \
2880 develop(bool, TraceLivenessGen, false, \
2881 "Trace the generation of liveness analysis information") \
2882 \
2883 notproduct(bool, TraceLivenessQuery, false, \
2884 "Trace queries of liveness analysis information") \
2885 \
2886 notproduct(bool, CollectIndexSetStatistics, false, \
2887 "Collect information about IndexSets") \
2888 \
2889 develop(bool, UseLoopSafepoints, true, \
2890 "Generate Safepoint nodes in every loop") \
2891 \
2892 develop(intx, FastAllocateSizeLimit, 128*K, \
2893 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2894 "Inline allocations larger than this in doublewords must go slow")\
2895 \
2896 product(bool, AggressiveOpts, false, \
2897 "Enable aggressive optimizations - see arguments.cpp") \
2898 \
2899 product_pd(uintx, TypeProfileLevel, \
2900 "=XYZ, with Z: Type profiling of arguments at call; " \
2901 "Y: Type profiling of return value at call; " \
2902 "X: Type profiling of parameters to methods; " \
2903 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2904 \
2905 product(intx, TypeProfileArgsLimit, 2, \
2906 "max number of call arguments to consider for type profiling") \
2907 \
2908 product(intx, TypeProfileParmsLimit, 2, \
2909 "max number of incoming parameters to consider for type profiling"\
2910 ", -1 for all") \
2911 \
2912 /* statistics */ \
2913 develop(bool, CountCompiledCalls, false, \
2914 "Count method invocations") \
2915 \
2916 notproduct(bool, CountRuntimeCalls, false, \
2917 "Count VM runtime calls") \
2918 \
2919 develop(bool, CountJNICalls, false, \
2920 "Count jni method invocations") \
2921 \
2922 notproduct(bool, CountJVMCalls, false, \
2923 "Count jvm method invocations") \
2924 \
2925 notproduct(bool, CountRemovableExceptions, false, \
2926 "Count exceptions that could be replaced by branches due to " \
2927 "inlining") \
2928 \
2929 notproduct(bool, ICMissHistogram, false, \
2930 "Produce histogram of IC misses") \
2931 \
2932 /* interpreter */ \
2933 develop(bool, ClearInterpreterLocals, false, \
2934 "Always clear local variables of interpreter activations upon " \
2935 "entry") \
2936 \
2937 product_pd(bool, RewriteBytecodes, \
2938 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2939 \
2940 product_pd(bool, RewriteFrequentPairs, \
2941 "Rewrite frequently used bytecode pairs into a single bytecode") \
2942 \
2943 diagnostic(bool, PrintInterpreter, false, \
2944 "Print the generated interpreter code") \
2945 \
2946 product(bool, UseInterpreter, true, \
2947 "Use interpreter for non-compiled methods") \
2948 \
2949 develop(bool, UseFastSignatureHandlers, true, \
2950 "Use fast signature handlers for native calls") \
2951 \
2952 product(bool, UseLoopCounter, true, \
2953 "Increment invocation counter on backward branch") \
2954 \
2955 product_pd(bool, UseOnStackReplacement, \
2956 "Use on stack replacement, calls runtime if invoc. counter " \
2957 "overflows in loop") \
2958 \
2959 notproduct(bool, TraceOnStackReplacement, false, \
2960 "Trace on stack replacement") \
2961 \
2962 product_pd(bool, PreferInterpreterNativeStubs, \
2963 "Use always interpreter stubs for native methods invoked via " \
2964 "interpreter") \
2965 \
2966 develop(bool, CountBytecodes, false, \
2967 "Count number of bytecodes executed") \
2968 \
2969 develop(bool, PrintBytecodeHistogram, false, \
2970 "Print histogram of the executed bytecodes") \
2971 \
2972 develop(bool, PrintBytecodePairHistogram, false, \
2973 "Print histogram of the executed bytecode pairs") \
2974 \
2975 diagnostic(bool, PrintSignatureHandlers, false, \
2976 "Print code generated for native method signature handlers") \
2977 \
2978 develop(bool, VerifyOops, false, \
2979 "Do plausibility checks for oops") \
2980 \
2981 develop(bool, CheckUnhandledOops, false, \
2982 "Check for unhandled oops in VM code") \
2983 \
2984 develop(bool, VerifyJNIFields, trueInDebug, \
2985 "Verify jfieldIDs for instance fields") \
2986 \
2987 notproduct(bool, VerifyJNIEnvThread, false, \
2988 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2989 "from JNI") \
2990 \
2991 develop(bool, VerifyFPU, false, \
2992 "Verify FPU state (check for NaN's, etc.)") \
2993 \
2994 develop(bool, VerifyThread, false, \
2995 "Watch the thread register for corruption (SPARC only)") \
2996 \
2997 develop(bool, VerifyActivationFrameSize, false, \
2998 "Verify that activation frame didn't become smaller than its " \
2999 "minimal size") \
3000 \
3001 develop(bool, TraceFrequencyInlining, false, \
3002 "Trace frequency based inlining") \
3003 \
3004 develop_pd(bool, InlineIntrinsics, \
3005 "Inline intrinsics that can be statically resolved") \
3006 \
3007 product_pd(bool, ProfileInterpreter, \
3008 "Profile at the bytecode level during interpretation") \
3009 \
3010 develop(bool, TraceProfileInterpreter, false, \
3011 "Trace profiling at the bytecode level during interpretation. " \
3012 "This outputs the profiling information collected to improve " \
3013 "jit compilation.") \
3014 \
3015 develop_pd(bool, ProfileTraps, \
3016 "Profile deoptimization traps at the bytecode level") \
3017 \
3018 product(intx, ProfileMaturityPercentage, 20, \
3019 "number of method invocations/branches (expressed as % of " \
3020 "CompileThreshold) before using the method's profile") \
3021 range(0, 100) \
3022 \
3023 diagnostic(bool, PrintMethodData, false, \
3024 "Print the results of +ProfileInterpreter at end of run") \
3025 \
3026 develop(bool, VerifyDataPointer, trueInDebug, \
3027 "Verify the method data pointer during interpreter profiling") \
3028 \
3029 develop(bool, VerifyCompiledCode, false, \
3030 "Include miscellaneous runtime verifications in nmethod code; " \
3031 "default off because it disturbs nmethod size heuristics") \
3032 \
3033 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3034 "Manually make GC thread crash then dump java stack trace; " \
3035 "Test only") \
3036 \
3037 /* compilation */ \
3038 product(bool, UseCompiler, true, \
3039 "Use Just-In-Time compilation") \
3040 \
3041 develop(bool, TraceCompilationPolicy, false, \
3042 "Trace compilation policy") \
3043 \
3044 develop(bool, TimeCompilationPolicy, false, \
3045 "Time the compilation policy") \
3046 \
3047 product(bool, UseCounterDecay, true, \
3048 "Adjust recompilation counters") \
3049 \
3050 develop(intx, CounterHalfLifeTime, 30, \
3051 "Half-life time of invocation counters (in seconds)") \
3052 \
3053 develop(intx, CounterDecayMinIntervalLength, 500, \
3054 "The minimum interval (in milliseconds) between invocation of " \
3055 "CounterDecay") \
3056 \
3057 product(bool, AlwaysCompileLoopMethods, false, \
3058 "When using recompilation, never interpret methods " \
3059 "containing loops") \
3060 \
3061 product(bool, DontCompileHugeMethods, true, \
3062 "Do not compile methods > HugeMethodLimit") \
3063 \
3064 /* Bytecode escape analysis estimation. */ \
3065 product(bool, EstimateArgEscape, true, \
3066 "Analyze bytecodes to estimate escape state of arguments") \
3067 \
3068 product(intx, BCEATraceLevel, 0, \
3069 "How much tracing to do of bytecode escape analysis estimates") \
3070 \
3071 product(intx, MaxBCEAEstimateLevel, 5, \
3072 "Maximum number of nested calls that are analyzed by BC EA") \
3073 \
3074 product(intx, MaxBCEAEstimateSize, 150, \
3075 "Maximum bytecode size of a method to be analyzed by BC EA") \
3076 \
3077 product(intx, AllocatePrefetchStyle, 1, \
3078 "0 = no prefetch, " \
3079 "1 = prefetch instructions for each allocation, " \
3080 "2 = use TLAB watermark to gate allocation prefetch, " \
3081 "3 = use BIS instruction on Sparc for allocation prefetch") \
3082 range(0, 3) \
3083 \
3084 product(intx, AllocatePrefetchDistance, -1, \
3085 "Distance to prefetch ahead of allocation pointer") \
3086 \
3087 product(intx, AllocatePrefetchLines, 3, \
3088 "Number of lines to prefetch ahead of array allocation pointer") \
3089 \
3090 product(intx, AllocateInstancePrefetchLines, 1, \
3091 "Number of lines to prefetch ahead of instance allocation " \
3092 "pointer") \
3093 \
3094 product(intx, AllocatePrefetchStepSize, 16, \
3095 "Step size in bytes of sequential prefetch instructions") \
3096 \
3097 product(intx, AllocatePrefetchInstr, 0, \
3098 "Prefetch instruction to prefetch ahead of allocation pointer") \
3099 \
3100 /* deoptimization */ \
3101 develop(bool, TraceDeoptimization, false, \
3102 "Trace deoptimization") \
3103 \
3104 develop(bool, DebugDeoptimization, false, \
3105 "Tracing various information while debugging deoptimization") \
3106 \
3107 product(intx, SelfDestructTimer, 0, \
3108 "Will cause VM to terminate after a given time (in minutes) " \
3109 "(0 means off)") \
3110 \
3111 product(intx, MaxJavaStackTraceDepth, 1024, \
3112 "The maximum number of lines in the stack trace for Java " \
3113 "exceptions (0 means all)") \
3114 \
3115 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3116 "Guarantee a safepoint (at least) every so many milliseconds " \
3117 "(0 means none)")) \
3118 \
3119 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3120 "Guarantee a safepoint (at least) every so many milliseconds " \
3121 "(0 means none)")) \
3122 \
3123 product(intx, SafepointTimeoutDelay, 10000, \
3124 "Delay in milliseconds for option SafepointTimeout") \
3125 \
3126 product(intx, NmethodSweepActivity, 10, \
3127 "Removes cold nmethods from code cache if > 0. Higher values " \
3128 "result in more aggressive sweeping") \
3129 range(0, 2000) \
3130 \
3131 notproduct(bool, LogSweeper, false, \
3132 "Keep a ring buffer of sweeper activity") \
3133 \
3134 notproduct(intx, SweeperLogEntries, 1024, \
3135 "Number of records in the ring buffer of sweeper activity") \
3136 \
3137 notproduct(intx, MemProfilingInterval, 500, \
3138 "Time between each invocation of the MemProfiler") \
3139 \
3140 develop(intx, MallocCatchPtr, -1, \
3141 "Hit breakpoint when mallocing/freeing this pointer") \
3142 \
3143 notproduct(ccstrlist, SuppressErrorAt, "", \
3144 "List of assertions (file:line) to muzzle") \
3145 \
3146 notproduct(size_t, HandleAllocationLimit, 1024, \
3147 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3148 "is used") \
3149 \
3150 develop(size_t, TotalHandleAllocationLimit, 1024, \
3151 "Threshold for total handle allocation when " \
3152 "+TraceHandleAllocation is used") \
3153 \
3154 develop(intx, StackPrintLimit, 100, \
3155 "number of stack frames to print in VM-level stack dump") \
3156 \
3157 notproduct(intx, MaxElementPrintSize, 256, \
3158 "maximum number of elements to print") \
3159 \
3160 notproduct(intx, MaxSubklassPrintSize, 4, \
3161 "maximum number of subklasses to print when printing klass") \
3162 \
3163 product(intx, MaxInlineLevel, 9, \
3164 "maximum number of nested calls that are inlined") \
3165 \
3166 product(intx, MaxRecursiveInlineLevel, 1, \
3167 "maximum number of nested recursive calls that are inlined") \
3168 \
3169 develop(intx, MaxForceInlineLevel, 100, \
3170 "maximum number of nested calls that are forced for inlining " \
3171 "(using CompilerOracle or marked w/ @ForceInline)") \
3172 \
3173 product_pd(intx, InlineSmallCode, \
3174 "Only inline already compiled methods if their code size is " \
3175 "less than this") \
3176 \
3177 product(intx, MaxInlineSize, 35, \
3178 "The maximum bytecode size of a method to be inlined") \
3179 \
3180 product_pd(intx, FreqInlineSize, \
3181 "The maximum bytecode size of a frequent method to be inlined") \
3182 \
3183 product(intx, MaxTrivialSize, 6, \
3184 "The maximum bytecode size of a trivial method to be inlined") \
3185 \
3186 product(intx, MinInliningThreshold, 250, \
3187 "The minimum invocation count a method needs to have to be " \
3188 "inlined") \
3189 \
3190 develop(intx, MethodHistogramCutoff, 100, \
3191 "The cutoff value for method invocation histogram (+CountCalls)") \
3192 \
3193 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3194 "Number of interpreted methods to show in profile") \
3195 \
3196 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3197 "Number of compiled methods to show in profile") \
3198 \
3199 develop(intx, ProfilerNumberOfStubMethods, 25, \
3200 "Number of stub methods to show in profile") \
3201 \
3202 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3203 "Number of runtime stub nodes to show in profile") \
3204 \
3205 product(intx, ProfileIntervalsTicks, 100, \
3206 "Number of ticks between printing of interval profile " \
3207 "(+ProfileIntervals)") \
3208 \
3209 notproduct(intx, ScavengeALotInterval, 1, \
3210 "Interval between which scavenge will occur with +ScavengeALot") \
3211 \
3212 notproduct(intx, FullGCALotInterval, 1, \
3213 "Interval between which full gc will occur with +FullGCALot") \
3214 \
3215 notproduct(intx, FullGCALotStart, 0, \
3216 "For which invocation to start FullGCAlot") \
3217 \
3218 notproduct(intx, FullGCALotDummies, 32*K, \
3219 "Dummy object allocated with +FullGCALot, forcing all objects " \
3220 "to move") \
3221 \
3222 develop(intx, DontYieldALotInterval, 10, \
3223 "Interval between which yields will be dropped (milliseconds)") \
3224 \
3225 develop(intx, MinSleepInterval, 1, \
3226 "Minimum sleep() interval (milliseconds) when " \
3227 "ConvertSleepToYield is off (used for Solaris)") \
3228 \
3229 develop(intx, ProfilerPCTickThreshold, 15, \
3230 "Number of ticks in a PC buckets to be a hotspot") \
3231 \
3232 notproduct(intx, DeoptimizeALotInterval, 5, \
3233 "Number of exits until DeoptimizeALot kicks in") \
3234 \
3235 notproduct(intx, ZombieALotInterval, 5, \
3236 "Number of exits until ZombieALot kicks in") \
3237 \
3238 diagnostic(intx, MallocVerifyInterval, 0, \
3239 "If non-zero, verify C heap after every N calls to " \
3240 "malloc/realloc/free") \
3241 \
3242 diagnostic(intx, MallocVerifyStart, 0, \
3243 "If non-zero, start verifying C heap after Nth call to " \
3244 "malloc/realloc/free") \
3245 \
3246 diagnostic(uintx, MallocMaxTestWords, 0, \
3247 "If non-zero, maximum number of words that malloc/realloc can " \
3248 "allocate (for testing only)") \
3249 \
3250 product(intx, TypeProfileWidth, 2, \
3251 "Number of receiver types to record in call/cast profile") \
3252 \
3253 develop(intx, BciProfileWidth, 2, \
3254 "Number of return bci's to record in ret profile") \
3255 \
3256 product(intx, PerMethodRecompilationCutoff, 400, \
3257 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3258 range(-1, max_intx) \
3259 \
3260 product(intx, PerBytecodeRecompilationCutoff, 200, \
3261 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3262 range(-1, max_intx) \
3263 \
3264 product(intx, PerMethodTrapLimit, 100, \
3265 "Limit on traps (of one kind) in a method (includes inlines)") \
3266 \
3267 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3268 "Limit on speculative traps (of one kind) in a method " \
3269 "(includes inlines)") \
3270 \
3271 product(intx, PerBytecodeTrapLimit, 4, \
3272 "Limit on traps (of one kind) at a particular BCI") \
3273 \
3274 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3275 "Extra method data trap entries for speculation") \
3276 \
3277 develop(intx, InlineFrequencyRatio, 20, \
3278 "Ratio of call site execution to caller method invocation") \
3279 \
3280 develop_pd(intx, InlineFrequencyCount, \
3281 "Count of call site execution necessary to trigger frequent " \
3282 "inlining") \
3283 \
3284 develop(intx, InlineThrowCount, 50, \
3285 "Force inlining of interpreted methods that throw this often") \
3286 \
3287 develop(intx, InlineThrowMaxSize, 200, \
3288 "Force inlining of throwing methods smaller than this") \
3289 \
3290 develop(intx, ProfilerNodeSize, 1024, \
3291 "Size in K to allocate for the Profile Nodes of each thread") \
3292 \
3293 /* gc parameters */ \
3294 product(size_t, InitialHeapSize, 0, \
3295 "Initial heap size (in bytes); zero means use ergonomics") \
3296 range(0, max_uintx) \
3297 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3298 \
3299 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3300 "Maximum heap size (in bytes)") \
3301 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3302 \
3303 product(size_t, OldSize, ScaleForWordSize(4*M), \
3304 "Initial tenured generation size (in bytes)") \
3305 \
3306 product(size_t, NewSize, ScaleForWordSize(1*M), \
3307 "Initial new generation size (in bytes)") \
3308 constraint(NewSizeConstraintFunc,AfterErgo) \
3309 \
3310 product(size_t, MaxNewSize, max_uintx, \
3311 "Maximum new generation size (in bytes), max_uintx means set " \
3312 "ergonomically") \
3313 \
3314 product(size_t, PretenureSizeThreshold, 0, \
3315 "Maximum size in bytes of objects allocated in DefNew " \
3316 "generation; zero means no maximum") \
3317 \
3318 product(size_t, MinTLABSize, 2*K, \
3319 "Minimum allowed TLAB size (in bytes)") \
3320 range(1, max_uintx) \
3321 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3322 \
3323 product(size_t, TLABSize, 0, \
3324 "Starting TLAB size (in bytes); zero means set ergonomically") \
3325 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3326 \
3327 product(size_t, YoungPLABSize, 4096, \
3328 "Size of young gen promotion LAB's (in HeapWords)") \
3329 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3330 \
3331 product(size_t, OldPLABSize, 1024, \
3332 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3333 "of blocks to attempt to claim when refilling CMS LAB's") \
3334 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3335 \
3336 product(uintx, TLABAllocationWeight, 35, \
3337 "Allocation averaging weight") \
3338 range(0, 100) \
3339 \
3340 /* Limit the lower bound of this flag to 1 as it is used */ \
3341 /* in a division expression. */ \
3342 product(uintx, TLABWasteTargetPercent, 1, \
3343 "Percentage of Eden that can be wasted") \
3344 range(1, 100) \
3345 \
3346 product(uintx, TLABRefillWasteFraction, 64, \
3347 "Maximum TLAB waste at a refill (internal fragmentation)") \
3348 range(1, max_uintx) \
3349 \
3350 product(uintx, TLABWasteIncrement, 4, \
3351 "Increment allowed waste at slow allocation") \
3352 \
3353 product(uintx, SurvivorRatio, 8, \
3354 "Ratio of eden/survivor space size") \
3355 range(1, max_uintx-2) \
3356 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3357 \
3358 product(uintx, NewRatio, 2, \
3359 "Ratio of old/new generation sizes") \
3360 range(0, max_uintx-1) \
3361 \
3362 product_pd(size_t, NewSizeThreadIncrease, \
3363 "Additional size added to desired new generation size per " \
3364 "non-daemon thread (in bytes)") \
3365 \
3366 product_pd(size_t, MetaspaceSize, \
3367 "Initial size of Metaspaces (in bytes)") \
3368 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3369 \
3370 product(size_t, MaxMetaspaceSize, max_uintx, \
3371 "Maximum size of Metaspaces (in bytes)") \
3372 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3373 \
3374 product(size_t, CompressedClassSpaceSize, 1*G, \
3375 "Maximum size of class area in Metaspace when compressed " \
3376 "class pointers are used") \
3377 range(1*M, 3*G) \
3378 \
3379 manageable(uintx, MinHeapFreeRatio, 40, \
3380 "The minimum percentage of heap free after GC to avoid expansion."\
3381 " For most GCs this applies to the old generation. In G1 and" \
3382 " ParallelGC it applies to the whole heap.") \
3383 range(0, 100) \
3384 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3385 \
3386 manageable(uintx, MaxHeapFreeRatio, 70, \
3387 "The maximum percentage of heap free after GC to avoid shrinking."\
3388 " For most GCs this applies to the old generation. In G1 and" \
3389 " ParallelGC it applies to the whole heap.") \
3390 range(0, 100) \
3391 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3392 \
3393 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3394 "Number of milliseconds per MB of free space in the heap") \
3395 range(0, max_intx) \
3396 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3397 \
3398 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3399 "The minimum change in heap space due to GC (in bytes)") \
3400 \
3401 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3402 "The minimum expansion of Metaspace (in bytes)") \
3403 \
3404 product(uintx, MaxMetaspaceFreeRatio, 70, \
3405 "The maximum percentage of Metaspace free after GC to avoid " \
3406 "shrinking") \
3407 range(0, 100) \
3408 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3409 \
3410 product(uintx, MinMetaspaceFreeRatio, 40, \
3411 "The minimum percentage of Metaspace free after GC to avoid " \
3412 "expansion") \
3413 range(0, 99) \
3414 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3415 \
3416 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3417 "The maximum expansion of Metaspace without full GC (in bytes)") \
3418 \
3419 product(uintx, QueuedAllocationWarningCount, 0, \
3420 "Number of times an allocation that queues behind a GC " \
3421 "will retry before printing a warning") \
3422 \
3423 diagnostic(uintx, VerifyGCStartAt, 0, \
3424 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3425 \
3426 diagnostic(intx, VerifyGCLevel, 0, \
3427 "Generation level at which to start +VerifyBefore/AfterGC") \
3428 range(0, 1) \
3429 \
3430 product(uintx, MaxTenuringThreshold, 15, \
3431 "Maximum value for tenuring threshold") \
3432 range(0, markOopDesc::max_age + 1) \
3433 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3434 \
3435 product(uintx, InitialTenuringThreshold, 7, \
3436 "Initial value for tenuring threshold") \
3437 range(0, markOopDesc::max_age + 1) \
3438 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3439 \
3440 product(uintx, TargetSurvivorRatio, 50, \
3441 "Desired percentage of survivor space used after scavenge") \
3442 range(0, 100) \
3443 \
3444 product(uintx, MarkSweepDeadRatio, 5, \
3445 "Percentage (0-100) of the old gen allowed as dead wood. " \
3446 "Serial mark sweep treats this as both the minimum and maximum " \
3447 "value. " \
3448 "CMS uses this value only if it falls back to mark sweep. " \
3449 "Par compact uses a variable scale based on the density of the " \
3450 "generation and treats this as the maximum value when the heap " \
3451 "is either completely full or completely empty. Par compact " \
3452 "also has a smaller default value; see arguments.cpp.") \
3453 range(0, 100) \
3454 \
3455 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3456 "How often should we fully compact the heap (ignoring the dead " \
3457 "space parameters)") \
3458 range(1, max_uintx) \
3459 \
3460 product(intx, PrintCMSStatistics, 0, \
3461 "Statistics for CMS") \
3462 \
3463 product(bool, PrintCMSInitiationStatistics, false, \
3464 "Statistics for initiating a CMS collection") \
3465 \
3466 product(intx, PrintFLSStatistics, 0, \
3467 "Statistics for CMS' FreeListSpace") \
3468 \
3469 product(intx, PrintFLSCensus, 0, \
3470 "Census for CMS' FreeListSpace") \
3471 \
3472 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3473 "Delay between expansion and allocation (in milliseconds)") \
3474 \
3475 develop(uintx, GCWorkerDelayMillis, 0, \
3476 "Delay in scheduling GC workers (in milliseconds)") \
3477 \
3478 product(intx, DeferThrSuspendLoopCount, 4000, \
3479 "(Unstable) Number of times to iterate in safepoint loop " \
3480 "before blocking VM threads ") \
3481 \
3482 product(intx, DeferPollingPageLoopCount, -1, \
3483 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3484 "before changing safepoint polling page to RO ") \
3485 \
3486 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3487 range(0, max_intx) \
3488 \
3489 product(bool, PSChunkLargeArrays, true, \
3490 "Process large arrays in chunks") \
3491 \
3492 product(uintx, GCDrainStackTargetSize, 64, \
3493 "Number of entries we will try to leave on the stack " \
3494 "during parallel gc") \
3495 \
3496 /* stack parameters */ \
3497 product_pd(intx, StackYellowPages, \
3498 "Number of yellow zone (recoverable overflows) pages") \
3499 range(1, max_intx) \
3500 \
3501 product_pd(intx, StackRedPages, \
3502 "Number of red zone (unrecoverable overflows) pages") \
3503 range(1, max_intx) \
3504 \
3505 /* greater stack shadow pages can't generate instruction to bang stack */ \
3506 product_pd(intx, StackShadowPages, \
3507 "Number of shadow zone (for overflow checking) pages " \
3508 "this should exceed the depth of the VM and native call stack") \
3509 range(1, 50) \
3510 \
3511 product_pd(intx, ThreadStackSize, \
3512 "Thread Stack Size (in Kbytes)") \
3513 \
3514 product_pd(intx, VMThreadStackSize, \
3515 "Non-Java Thread Stack Size (in Kbytes)") \
3516 \
3517 product_pd(intx, CompilerThreadStackSize, \
3518 "Compiler Thread Stack Size (in Kbytes)") \
3519 \
3520 develop_pd(size_t, JVMInvokeMethodSlack, \
3521 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3522 \
3523 /* code cache parameters */ \
3524 /* ppc64/tiered compilation has large code-entry alignment. */ \
3525 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3526 "Code cache segment size (in bytes) - smallest unit of " \
3527 "allocation") \
3528 range(1, 1024) \
3529 \
3530 develop_pd(intx, CodeEntryAlignment, \
3531 "Code entry alignment for generated code (in bytes)") \
3532 \
3533 product_pd(intx, OptoLoopAlignment, \
3534 "Align inner loops to zero relative to this modulus") \
3535 \
3536 product_pd(uintx, InitialCodeCacheSize, \
3537 "Initial code cache size (in bytes)") \
3538 \
3539 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3540 "Minimum code cache size (in bytes) required to start VM.") \
3541 \
3542 product(bool, SegmentedCodeCache, false, \
3543 "Use a segmented code cache") \
3544 \
3545 product_pd(uintx, ReservedCodeCacheSize, \
3546 "Reserved code cache size (in bytes) - maximum code cache size") \
3547 \
3548 product_pd(uintx, NonProfiledCodeHeapSize, \
3549 "Size of code heap with non-profiled methods (in bytes)") \
3550 \
3551 product_pd(uintx, ProfiledCodeHeapSize, \
3552 "Size of code heap with profiled methods (in bytes)") \
3553 \
3554 product_pd(uintx, NonNMethodCodeHeapSize, \
3555 "Size of code heap with non-nmethods (in bytes)") \
3556 \
3557 product_pd(uintx, CodeCacheExpansionSize, \
3558 "Code cache expansion size (in bytes)") \
3559 \
3560 develop_pd(uintx, CodeCacheMinBlockLength, \
3561 "Minimum number of segments in a code cache block") \
3562 range(1, 100) \
3563 \
3564 notproduct(bool, ExitOnFullCodeCache, false, \
3565 "Exit the VM if we fill the code cache") \
3566 \
3567 product(bool, UseCodeCacheFlushing, true, \
3568 "Remove cold/old nmethods from the code cache") \
3569 \
3570 product(uintx, StartAggressiveSweepingAt, 10, \
3571 "Start aggressive sweeping if X[%] of the code cache is free." \
3572 "Segmented code cache: X[%] of the non-profiled heap." \
3573 "Non-segmented code cache: X[%] of the total code cache") \
3574 range(0, 100) \
3575 \
3576 /* interpreter debugging */ \
3577 develop(intx, BinarySwitchThreshold, 5, \
3578 "Minimal number of lookupswitch entries for rewriting to binary " \
3579 "switch") \
3580 \
3581 develop(intx, StopInterpreterAt, 0, \
3582 "Stop interpreter execution at specified bytecode number") \
3583 \
3584 develop(intx, TraceBytecodesAt, 0, \
3585 "Trace bytecodes starting with specified bytecode number") \
3586 \
3587 /* compiler interface */ \
3588 develop(intx, CIStart, 0, \
3589 "The id of the first compilation to permit") \
3590 \
3591 develop(intx, CIStop, max_jint, \
3592 "The id of the last compilation to permit") \
3593 \
3594 develop(intx, CIStartOSR, 0, \
3595 "The id of the first osr compilation to permit " \
3596 "(CICountOSR must be on)") \
3597 \
3598 develop(intx, CIStopOSR, max_jint, \
3599 "The id of the last osr compilation to permit " \
3600 "(CICountOSR must be on)") \
3601 \
3602 develop(intx, CIBreakAtOSR, -1, \
3603 "The id of osr compilation to break at") \
3604 \
3605 develop(intx, CIBreakAt, -1, \
3606 "The id of compilation to break at") \
3607 \
3608 product(ccstrlist, CompileOnly, "", \
3609 "List of methods (pkg/class.name) to restrict compilation to") \
3610 \
3611 product(ccstr, CompileCommandFile, NULL, \
3612 "Read compiler commands from this file [.hotspot_compiler]") \
3613 \
3614 product(ccstrlist, CompileCommand, "", \
3615 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3616 \
3617 develop(bool, ReplayCompiles, false, \
3618 "Enable replay of compilations from ReplayDataFile") \
3619 \
3620 product(ccstr, ReplayDataFile, NULL, \
3621 "File containing compilation replay information" \
3622 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3623 \
3624 product(ccstr, InlineDataFile, NULL, \
3625 "File containing inlining replay information" \
3626 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3627 \
3628 develop(intx, ReplaySuppressInitializers, 2, \
3629 "Control handling of class initialization during replay: " \
3630 "0 - don't do anything special; " \
3631 "1 - treat all class initializers as empty; " \
3632 "2 - treat class initializers for application classes as empty; " \
3633 "3 - allow all class initializers to run during bootstrap but " \
3634 " pretend they are empty after starting replay") \
3635 range(0, 3) \
3636 \
3637 develop(bool, ReplayIgnoreInitErrors, false, \
3638 "Ignore exceptions thrown during initialization for replay") \
3639 \
3640 product(bool, DumpReplayDataOnError, true, \
3641 "Record replay data for crashing compiler threads") \
3642 \
3643 product(bool, CICompilerCountPerCPU, false, \
3644 "1 compiler thread for log(N CPUs)") \
3645 \
3646 develop(intx, CIFireOOMAt, -1, \
3647 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3648 "(non-negative value throws OOM after this many CI accesses " \
3649 "in each compile)") \
3650 notproduct(intx, CICrashAt, -1, \
3651 "id of compilation to trigger assert in compiler thread for " \
3652 "the purpose of testing, e.g. generation of replay data") \
3653 notproduct(bool, CIObjectFactoryVerify, false, \
3654 "enable potentially expensive verification in ciObjectFactory") \
3655 \
3656 /* Priorities */ \
3657 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3658 \
3659 product(intx, ThreadPriorityPolicy, 0, \
3660 "0 : Normal. "\
3661 " VM chooses priorities that are appropriate for normal "\
3662 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3663 " to normal native priority. Java priorities below " \
3664 " NORM_PRIORITY map to lower native priority values. On "\
3665 " Windows applications are allowed to use higher native "\
3666 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3667 " not use the highest possible native priority, "\
3668 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3669 " system threads. On Linux thread priorities are ignored "\
3670 " because the OS does not support static priority in "\
3671 " SCHED_OTHER scheduling class which is the only choice for "\
3672 " non-root, non-realtime applications. "\
3673 "1 : Aggressive. "\
3674 " Java thread priorities map over to the entire range of "\
3675 " native thread priorities. Higher Java thread priorities map "\
3676 " to higher native thread priorities. This policy should be "\
3677 " used with care, as sometimes it can cause performance "\
3678 " degradation in the application and/or the entire system. On "\
3679 " Linux this policy requires root privilege.") \
3680 range(0, 1) \
3681 \
3682 product(bool, ThreadPriorityVerbose, false, \
3683 "Print priority changes") \
3684 \
3685 product(intx, CompilerThreadPriority, -1, \
3686 "The native priority at which compiler threads should run " \
3687 "(-1 means no change)") \
3688 \
3689 product(intx, VMThreadPriority, -1, \
3690 "The native priority at which the VM thread should run " \
3691 "(-1 means no change)") \
3692 \
3693 product(bool, CompilerThreadHintNoPreempt, true, \
3694 "(Solaris only) Give compiler threads an extra quanta") \
3695 \
3696 product(bool, VMThreadHintNoPreempt, false, \
3697 "(Solaris only) Give VM thread an extra quanta") \
3698 \
3699 product(intx, JavaPriority1_To_OSPriority, -1, \
3700 "Map Java priorities to OS priorities") \
3701 \
3702 product(intx, JavaPriority2_To_OSPriority, -1, \
3703 "Map Java priorities to OS priorities") \
3704 \
3705 product(intx, JavaPriority3_To_OSPriority, -1, \
3706 "Map Java priorities to OS priorities") \
3707 \
3708 product(intx, JavaPriority4_To_OSPriority, -1, \
3709 "Map Java priorities to OS priorities") \
3710 \
3711 product(intx, JavaPriority5_To_OSPriority, -1, \
3712 "Map Java priorities to OS priorities") \
3713 \
3714 product(intx, JavaPriority6_To_OSPriority, -1, \
3715 "Map Java priorities to OS priorities") \
3716 \
3717 product(intx, JavaPriority7_To_OSPriority, -1, \
3718 "Map Java priorities to OS priorities") \
3719 \
3720 product(intx, JavaPriority8_To_OSPriority, -1, \
3721 "Map Java priorities to OS priorities") \
3722 \
3723 product(intx, JavaPriority9_To_OSPriority, -1, \
3724 "Map Java priorities to OS priorities") \
3725 \
3726 product(intx, JavaPriority10_To_OSPriority,-1, \
3727 "Map Java priorities to OS priorities") \
3728 \
3729 experimental(bool, UseCriticalJavaThreadPriority, false, \
3730 "Java thread priority 10 maps to critical scheduling priority") \
3731 \
3732 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3733 "Compiler thread(s) run at critical scheduling priority") \
3734 \
3735 experimental(bool, UseCriticalCMSThreadPriority, false, \
3736 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3737 \
3738 /* compiler debugging */ \
3739 notproduct(intx, CompileTheWorldStartAt, 1, \
3740 "First class to consider when using +CompileTheWorld") \
3741 \
3742 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3743 "Last class to consider when using +CompileTheWorld") \
3744 \
3745 develop(intx, NewCodeParameter, 0, \
3746 "Testing Only: Create a dedicated integer parameter before " \
3747 "putback") \
3748 \
3749 /* new oopmap storage allocation */ \
3750 develop(intx, MinOopMapAllocation, 8, \
3751 "Minimum number of OopMap entries in an OopMapSet") \
3752 \
3753 /* Background Compilation */ \
3754 develop(intx, LongCompileThreshold, 50, \
3755 "Used with +TraceLongCompiles") \
3756 \
3757 /* recompilation */ \
3758 product_pd(intx, CompileThreshold, \
3759 "number of interpreted method invocations before (re-)compiling") \
3760 \
3761 product(double, CompileThresholdScaling, 1.0, \
3762 "Factor to control when first compilation happens " \
3763 "(both with and without tiered compilation): " \
3764 "values greater than 1.0 delay counter overflow, " \
3765 "values between 0 and 1.0 rush counter overflow, " \
3766 "value of 1.0 leaves compilation thresholds unchanged " \
3767 "value of 0.0 is equivalent to -Xint. " \
3768 "" \
3769 "Flag can be set as per-method option. " \
3770 "If a value is specified for a method, compilation thresholds " \
3771 "for that method are scaled by both the value of the global flag "\
3772 "and the value of the per-method flag.") \
3773 \
3774 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3775 "Interpreter (tier 0) invocation notification frequency") \
3776 \
3777 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3778 "C1 without MDO (tier 2) invocation notification frequency") \
3779 \
3780 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3781 "C1 with MDO profiling (tier 3) invocation notification " \
3782 "frequency") \
3783 \
3784 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3785 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3786 \
3787 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3788 "Interpreter (tier 0) invocation notification frequency") \
3789 \
3790 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3791 "C1 without MDO (tier 2) invocation notification frequency") \
3792 \
3793 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3794 "C1 with MDO profiling (tier 3) invocation notification " \
3795 "frequency") \
3796 \
3797 product(intx, Tier2CompileThreshold, 0, \
3798 "threshold at which tier 2 compilation is invoked") \
3799 \
3800 product(intx, Tier2BackEdgeThreshold, 0, \
3801 "Back edge threshold at which tier 2 compilation is invoked") \
3802 \
3803 product(intx, Tier3InvocationThreshold, 200, \
3804 "Compile if number of method invocations crosses this " \
3805 "threshold") \
3806 \
3807 product(intx, Tier3MinInvocationThreshold, 100, \
3808 "Minimum invocation to compile at tier 3") \
3809 \
3810 product(intx, Tier3CompileThreshold, 2000, \
3811 "Threshold at which tier 3 compilation is invoked (invocation " \
3812 "minimum must be satisfied") \
3813 \
3814 product(intx, Tier3BackEdgeThreshold, 60000, \
3815 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3816 \
3817 product(intx, Tier4InvocationThreshold, 5000, \
3818 "Compile if number of method invocations crosses this " \
3819 "threshold") \
3820 \
3821 product(intx, Tier4MinInvocationThreshold, 600, \
3822 "Minimum invocation to compile at tier 4") \
3823 \
3824 product(intx, Tier4CompileThreshold, 15000, \
3825 "Threshold at which tier 4 compilation is invoked (invocation " \
3826 "minimum must be satisfied") \
3827 \
3828 product(intx, Tier4BackEdgeThreshold, 40000, \
3829 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3830 \
3831 product(intx, Tier3DelayOn, 5, \
3832 "If C2 queue size grows over this amount per compiler thread " \
3833 "stop compiling at tier 3 and start compiling at tier 2") \
3834 \
3835 product(intx, Tier3DelayOff, 2, \
3836 "If C2 queue size is less than this amount per compiler thread " \
3837 "allow methods compiled at tier 2 transition to tier 3") \
3838 \
3839 product(intx, Tier3LoadFeedback, 5, \
3840 "Tier 3 thresholds will increase twofold when C1 queue size " \
3841 "reaches this amount per compiler thread") \
3842 \
3843 product(intx, Tier4LoadFeedback, 3, \
3844 "Tier 4 thresholds will increase twofold when C2 queue size " \
3845 "reaches this amount per compiler thread") \
3846 \
3847 product(intx, TieredCompileTaskTimeout, 50, \
3848 "Kill compile task if method was not used within " \
3849 "given timeout in milliseconds") \
3850 \
3851 product(intx, TieredStopAtLevel, 4, \
3852 "Stop at given compilation level") \
3853 \
3854 product(intx, Tier0ProfilingStartPercentage, 200, \
3855 "Start profiling in interpreter if the counters exceed tier 3 " \
3856 "thresholds by the specified percentage") \
3857 \
3858 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3859 "Increase the compile threshold for C1 compilation if the code " \
3860 "cache is filled by the specified percentage") \
3861 range(0, 99) \
3862 \
3863 product(intx, TieredRateUpdateMinTime, 1, \
3864 "Minimum rate sampling interval (in milliseconds)") \
3865 \
3866 product(intx, TieredRateUpdateMaxTime, 25, \
3867 "Maximum rate sampling interval (in milliseconds)") \
3868 \
3869 product_pd(bool, TieredCompilation, \
3870 "Enable tiered compilation") \
3871 \
3872 product(bool, PrintTieredEvents, false, \
3873 "Print tiered events notifications") \
3874 \
3875 product_pd(intx, OnStackReplacePercentage, \
3876 "NON_TIERED number of method invocations/branches (expressed as " \
3877 "% of CompileThreshold) before (re-)compiling OSR code") \
3878 \
3879 product(intx, InterpreterProfilePercentage, 33, \
3880 "NON_TIERED number of method invocations/branches (expressed as " \
3881 "% of CompileThreshold) before profiling in the interpreter") \
3882 range(0, 100) \
3883 \
3884 develop(intx, MaxRecompilationSearchLength, 10, \
3885 "The maximum number of frames to inspect when searching for " \
3886 "recompilee") \
3887 \
3888 develop(intx, MaxInterpretedSearchLength, 3, \
3889 "The maximum number of interpreted frames to skip when searching "\
3890 "for recompilee") \
3891 \
3892 develop(intx, DesiredMethodLimit, 8000, \
3893 "The desired maximum method size (in bytecodes) after inlining") \
3894 \
3895 develop(intx, HugeMethodLimit, 8000, \
3896 "Don't compile methods larger than this if " \
3897 "+DontCompileHugeMethods") \
3898 \
3899 /* New JDK 1.4 reflection implementation */ \
3900 \
3901 develop(intx, FastSuperclassLimit, 8, \
3902 "Depth of hardwired instanceof accelerator array") \
3903 \
3904 /* Properties for Java libraries */ \
3905 \
3906 product(size_t, MaxDirectMemorySize, 0, \
3907 "Maximum total size of NIO direct-buffer allocations") \
3908 \
3909 /* Flags used for temporary code during development */ \
3910 \
3911 diagnostic(bool, UseNewCode, false, \
3912 "Testing Only: Use the new version while testing") \
3913 \
3914 diagnostic(bool, UseNewCode2, false, \
3915 "Testing Only: Use the new version while testing") \
3916 \
3917 diagnostic(bool, UseNewCode3, false, \
3918 "Testing Only: Use the new version while testing") \
3919 \
3920 /* flags for performance data collection */ \
3921 \
3922 product(bool, UsePerfData, falseInEmbedded, \
3923 "Flag to disable jvmstat instrumentation for performance testing "\
3924 "and problem isolation purposes") \
3925 \
3926 product(bool, PerfDataSaveToFile, false, \
3927 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3928 \
3929 product(ccstr, PerfDataSaveFile, NULL, \
3930 "Save PerfData memory to the specified absolute pathname. " \
3931 "The string %p in the file name (if present) " \
3932 "will be replaced by pid") \
3933 \
3934 product(intx, PerfDataSamplingInterval, 50, \
3935 "Data sampling interval (in milliseconds)") \
3936 \
3937 develop(bool, PerfTraceDataCreation, false, \
3938 "Trace creation of Performance Data Entries") \
3939 \
3940 develop(bool, PerfTraceMemOps, false, \
3941 "Trace PerfMemory create/attach/detach calls") \
3942 \
3943 product(bool, PerfDisableSharedMem, false, \
3944 "Store performance data in standard memory") \
3945 \
3946 product(intx, PerfDataMemorySize, 64*K, \
3947 "Size of performance data memory region. Will be rounded " \
3948 "up to a multiple of the native os page size.") \
3949 \
3950 product(intx, PerfMaxStringConstLength, 1024, \
3951 "Maximum PerfStringConstant string length before truncation") \
3952 \
3953 product(bool, PerfAllowAtExitRegistration, false, \
3954 "Allow registration of atexit() methods") \
3955 \
3956 product(bool, PerfBypassFileSystemCheck, false, \
3957 "Bypass Win32 file system criteria checks (Windows Only)") \
3958 \
3959 product(intx, UnguardOnExecutionViolation, 0, \
3960 "Unguard page and retry on no-execute fault (Win32 only) " \
3961 "0=off, 1=conservative, 2=aggressive") \
3962 range(0, 2) \
3963 \
3964 /* Serviceability Support */ \
3965 \
3966 product(bool, ManagementServer, false, \
3967 "Create JMX Management Server") \
3968 \
3969 product(bool, DisableAttachMechanism, false, \
3970 "Disable mechanism that allows tools to attach to this VM") \
3971 \
3972 product(bool, StartAttachListener, false, \
3973 "Always start Attach Listener at VM startup") \
3974 \
3975 manageable(bool, PrintConcurrentLocks, false, \
3976 "Print java.util.concurrent locks in thread dump") \
3977 \
3978 product(bool, TransmitErrorReport, false, \
3979 "Enable error report transmission on erroneous termination") \
3980 \
3981 product(ccstr, ErrorReportServer, NULL, \
3982 "Override built-in error report server address") \
3983 \
3984 /* Shared spaces */ \
3985 \
3986 product(bool, UseSharedSpaces, true, \
3987 "Use shared spaces for metadata") \
3988 \
3989 product(bool, VerifySharedSpaces, false, \
3990 "Verify shared spaces (false for default archive, true for " \
3991 "archive specified by -XX:SharedArchiveFile)") \
3992 \
3993 product(bool, RequireSharedSpaces, false, \
3994 "Require shared spaces for metadata") \
3995 \
3996 product(bool, DumpSharedSpaces, false, \
3997 "Special mode: JVM reads a class list, loads classes, builds " \
3998 "shared spaces, and dumps the shared spaces to a file to be " \
3999 "used in future JVM runs") \
4000 \
4001 product(bool, PrintSharedSpaces, false, \
4002 "Print usage of shared spaces") \
4003 \
4004 product(bool, PrintSharedArchiveAndExit, false, \
4005 "Print shared archive file contents") \
4006 \
4007 product(bool, PrintSharedDictionary, false, \
4008 "If PrintSharedArchiveAndExit is true, also print the shared " \
4009 "dictionary") \
4010 \
4011 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4012 "Size of read-write space for metadata (in bytes)") \
4013 \
4014 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4015 "Size of read-only space for metadata (in bytes)") \
4016 \
4017 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
4018 "Size of the shared miscellaneous data area (in bytes)") \
4019 \
4020 product(uintx, SharedMiscCodeSize, 120*K, \
4021 "Size of the shared miscellaneous code area (in bytes)") \
4022 \
4023 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
4024 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4025 "Address to allocate shared memory region for class data") \
4026 \
4027 product(uintx, SharedSymbolTableBucketSize, 4, \
4028 "Average number of symbols per bucket in shared table") \
4029 \
4030 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4031 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4032 "classes. Just exclude them from the shared dictionary.") \
4033 \
4034 diagnostic(bool, PrintMethodHandleStubs, false, \
4035 "Print generated stub code for method handles") \
4036 \
4037 develop(bool, TraceMethodHandles, false, \
4038 "trace internal method handle operations") \
4039 \
4040 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4041 "perform extra checks when constructing method handles") \
4042 \
4043 diagnostic(bool, ShowHiddenFrames, false, \
4044 "show method handle implementation frames (usually hidden)") \
4045 \
4046 experimental(bool, TrustFinalNonStaticFields, false, \
4047 "trust final non-static declarations for constant folding") \
4048 \
4049 diagnostic(bool, FoldStableValues, true, \
4050 "Optimize loads from stable fields (marked w/ @Stable)") \
4051 \
4052 develop(bool, TraceInvokeDynamic, false, \
4053 "trace internal invoke dynamic operations") \
4054 \
4055 diagnostic(bool, PauseAtStartup, false, \
4056 "Causes the VM to pause at startup time and wait for the pause " \
4057 "file to be removed (default: ./vm.paused.<pid>)") \
4058 \
4059 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4060 "The file to create and for whose removal to await when pausing " \
4061 "at startup. (default: ./vm.paused.<pid>)") \
4062 \
4063 diagnostic(bool, PauseAtExit, false, \
4064 "Pause and wait for keypress on exit if a debugger is attached") \
4065 \
4066 product(bool, ExtendedDTraceProbes, false, \
4067 "Enable performance-impacting dtrace probes") \
4068 \
4069 product(bool, DTraceMethodProbes, false, \
4070 "Enable dtrace probes for method-entry and method-exit") \
4071 \
4072 product(bool, DTraceAllocProbes, false, \
4073 "Enable dtrace probes for object allocation") \
4074 \
4075 product(bool, DTraceMonitorProbes, false, \
4076 "Enable dtrace probes for monitor events") \
4077 \
4078 product(bool, RelaxAccessControlCheck, false, \
4079 "Relax the access control checks in the verifier") \
4080 \
4081 product(uintx, StringTableSize, defaultStringTableSize, \
4082 "Number of buckets in the interned String table") \
4083 range(minimumStringTableSize, 111*defaultStringTableSize) \
4084 \
4085 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4086 "Number of buckets in the JVM internal Symbol table") \
4087 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4088 \
4089 product(bool, UseStringDeduplication, false, \
4090 "Use string deduplication") \
4091 \
4092 product(bool, PrintStringDeduplicationStatistics, false, \
4093 "Print string deduplication statistics") \
4094 \
4095 product(uintx, StringDeduplicationAgeThreshold, 3, \
4096 "A string must reach this age (or be promoted to an old region) " \
4097 "to be considered for deduplication") \
4098 range(1, markOopDesc::max_age) \
4099 \
4100 diagnostic(bool, StringDeduplicationResizeALot, false, \
4101 "Force table resize every time the table is scanned") \
4102 \
4103 diagnostic(bool, StringDeduplicationRehashALot, false, \
4104 "Force table rehash every time the table is scanned") \
4105 \
4106 develop(bool, TraceDefaultMethods, false, \
4107 "Trace the default method processing steps") \
4108 \
4109 diagnostic(bool, WhiteBoxAPI, false, \
4110 "Enable internal testing APIs") \
4111 \
4112 product(bool, PrintGCCause, true, \
4113 "Include GC cause in GC logging") \
4114 \
4115 experimental(intx, SurvivorAlignmentInBytes, 0, \
4116 "Default survivor space alignment in bytes") \
4117 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4118 \
4119 product(bool , AllowNonVirtualCalls, false, \
4120 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4121 \
4122 product(ccstr, DumpLoadedClassList, NULL, \
4123 "Dump the names all loaded classes, that could be stored into " \
4124 "the CDS archive, in the specified file") \
4125 \
4126 product(ccstr, SharedClassListFile, NULL, \
4127 "Override the default CDS class list") \
4128 \
4129 diagnostic(ccstr, SharedArchiveFile, NULL, \
4130 "Override the default location of the CDS archive file") \
4131 \
4132 product(ccstr, ExtraSharedClassListFile, NULL, \
4133 "Extra classlist for building the CDS archive file") \
4134 \
4135 experimental(size_t, ArrayAllocatorMallocLimit, \
4136 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4137 "Allocation less than this value will be allocated " \
4138 "using malloc. Larger allocations will use mmap.") \
4139 \
4140 experimental(bool, AlwaysAtomicAccesses, false, \
4141 "Accesses to all variables should always be atomic") \
4142 \
4143 product(bool, EnableTracing, false, \
4144 "Enable event-based tracing") \
4145 \
4146 product(bool, UseLockedTracing, false, \
4147 "Use locked-tracing when doing event-based tracing") \
4148 \
4149 diagnostic(bool, UseUnalignedAccesses, false, \
4150 "Use unaligned memory accesses in sun.misc.Unsafe") \
4151 \
4152 product_pd(bool, PreserveFramePointer, \
4153 "Use the FP register for holding the frame pointer " \
4154 "and not as a general purpose register.") \
4155 \
4156 diagnostic(bool, CheckIntrinsics, true, \
4157 "When a class C is loaded, check that " \
4158 "(1) all intrinsics defined by the VM for class C are present "\
4159 "in the loaded class file and are marked with the " \
4160 "@HotSpotIntrinsicCandidate annotation, that " \
4161 "(2) there is an intrinsic registered for all loaded methods " \
4162 "that are annotated with the @HotSpotIntrinsicCandidate " \
4163 "annotation, and that " \
4164 "(3) no orphan methods exist for class C (i.e., methods for " \
4165 "which the VM declares an intrinsic but that are not declared "\
4166 "in the loaded class C. " \
4167 "Check (3) is available only in debug builds.")
4168
4169 /*
4170 * Macros for factoring of globals
4171 */
4172
4173 // Interface macros
4174 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4175 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4176 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4177 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4178 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4179 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4180 #ifdef PRODUCT
4181 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4182 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4183 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4184 #else
4185 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4186 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4187 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4188 #endif // PRODUCT
4189 // Special LP64 flags, product only needed for now.
4190 #ifdef _LP64
4191 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4192 #else
4193 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4194 #endif // _LP64
4195
4196 // Implementation macros
4197 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4198 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4199 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4200 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4201 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4202 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4203 #ifdef PRODUCT
4204 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4205 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4206 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4207 #else
4208 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4209 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4210 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4211 #endif // PRODUCT
4212 #ifdef _LP64
4213 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4214 #else
4215 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4216 #endif // _LP64
4217
4218 // Only materialize src code for range checking when required, ignore otherwise
4219 #define IGNORE_RANGE(a, b)
4220 // Only materialize src code for contraint checking when required, ignore otherwise
4221 #define IGNORE_CONSTRAINT(func,type)
4222
4223 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4224 DECLARE_PD_DEVELOPER_FLAG, \
4225 DECLARE_PRODUCT_FLAG, \
4226 DECLARE_PD_PRODUCT_FLAG, \
4227 DECLARE_DIAGNOSTIC_FLAG, \
4228 DECLARE_EXPERIMENTAL_FLAG, \
4229 DECLARE_NOTPRODUCT_FLAG, \
4230 DECLARE_MANAGEABLE_FLAG, \
4231 DECLARE_PRODUCT_RW_FLAG, \
4232 DECLARE_LP64_PRODUCT_FLAG, \
4233 IGNORE_RANGE, \
4234 IGNORE_CONSTRAINT)
4235
4236 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4237 DECLARE_PD_DEVELOPER_FLAG, \
4238 DECLARE_PRODUCT_FLAG, \
4239 DECLARE_PD_PRODUCT_FLAG, \
4240 DECLARE_DIAGNOSTIC_FLAG, \
4241 DECLARE_NOTPRODUCT_FLAG, \
4242 IGNORE_RANGE, \
4243 IGNORE_CONSTRAINT)
4244
4245 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4246 DECLARE_PRODUCT_FLAG, \
4247 DECLARE_DIAGNOSTIC_FLAG, \
4248 DECLARE_EXPERIMENTAL_FLAG, \
4249 DECLARE_NOTPRODUCT_FLAG, \
4250 IGNORE_RANGE, \
4251 IGNORE_CONSTRAINT)
4252
4253 // Extensions
4254
4255 #include "runtime/globals_ext.hpp"
4256
4257 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP