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 /* Temporary: See 6948537 */ \
643 experimental(bool, UseMemSetInBOT, true, \
644 "(Unstable) uses memset in BOT updates in GC code") \
645 \
646 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
647 "Enable normal processing of flags relating to field diagnostics")\
648 \
649 experimental(bool, UnlockExperimentalVMOptions, false, \
650 "Enable normal processing of flags relating to experimental " \
651 "features") \
652 \
653 product(bool, JavaMonitorsInStackTrace, true, \
654 "Print information about Java monitor locks when the stacks are" \
655 "dumped") \
656 \
657 product_pd(bool, UseLargePages, \
658 "Use large page memory") \
659 \
660 product_pd(bool, UseLargePagesIndividualAllocation, \
661 "Allocate large pages individually for better affinity") \
662 \
663 develop(bool, LargePagesIndividualAllocationInjectError, false, \
664 "Fail large pages individual allocation") \
665 \
666 product(bool, UseLargePagesInMetaspace, false, \
667 "Use large page memory in metaspace. " \
668 "Only used if UseLargePages is enabled.") \
669 \
670 develop(bool, TracePageSizes, false, \
671 "Trace page size selection and usage") \
672 \
673 product(bool, UseNUMA, false, \
674 "Use NUMA if available") \
675 \
676 product(bool, UseNUMAInterleaving, false, \
677 "Interleave memory across NUMA nodes if available") \
678 \
679 product(size_t, NUMAInterleaveGranularity, 2*M, \
680 "Granularity to use for NUMA interleaving on Windows OS") \
681 \
682 product(bool, ForceNUMA, false, \
683 "Force NUMA optimizations on single-node/UMA systems") \
684 \
685 product(uintx, NUMAChunkResizeWeight, 20, \
686 "Percentage (0-100) used to weight the current sample when " \
687 "computing exponentially decaying average for " \
688 "AdaptiveNUMAChunkSizing") \
689 range(0, 100) \
690 \
691 product(size_t, NUMASpaceResizeRate, 1*G, \
692 "Do not reallocate more than this amount per collection") \
693 \
694 product(bool, UseAdaptiveNUMAChunkSizing, true, \
695 "Enable adaptive chunk sizing for NUMA") \
696 \
697 product(bool, NUMAStats, false, \
698 "Print NUMA stats in detailed heap information") \
699 \
700 product(uintx, NUMAPageScanRate, 256, \
701 "Maximum number of pages to include in the page scan procedure") \
702 \
703 product_pd(bool, NeedsDeoptSuspend, \
704 "True for register window machines (sparc/ia64)") \
705 \
706 product(intx, UseSSE, 99, \
707 "Highest supported SSE instructions set on x86/x64") \
708 \
709 product(bool, UseAES, false, \
710 "Control whether AES instructions can be used on x86/x64") \
711 \
712 product(bool, UseSHA, false, \
713 "Control whether SHA instructions can be used " \
714 "on SPARC and on ARM") \
715 \
716 product(bool, UseGHASHIntrinsics, false, \
717 "Use intrinsics for GHASH versions of crypto") \
718 \
719 product(size_t, LargePageSizeInBytes, 0, \
720 "Large page size (0 to let VM choose the page size)") \
721 \
722 product(size_t, LargePageHeapSizeThreshold, 128*M, \
723 "Use large pages if maximum heap is at least this big") \
724 \
725 product(bool, ForceTimeHighResolution, false, \
726 "Using high time resolution (for Win32 only)") \
727 \
728 develop(bool, TraceItables, false, \
729 "Trace initialization and use of itables") \
730 \
731 develop(bool, TracePcPatching, false, \
732 "Trace usage of frame::patch_pc") \
733 \
734 develop(bool, TraceJumps, false, \
735 "Trace assembly jumps in thread ring buffer") \
736 \
737 develop(bool, TraceRelocator, false, \
738 "Trace the bytecode relocator") \
739 \
740 develop(bool, TraceLongCompiles, false, \
741 "Print out every time compilation is longer than " \
742 "a given threshold") \
743 \
744 develop(bool, SafepointALot, false, \
745 "Generate a lot of safepoints. This works with " \
746 "GuaranteedSafepointInterval") \
747 \
748 product_pd(bool, BackgroundCompilation, \
749 "A thread requesting compilation is not blocked during " \
750 "compilation") \
751 \
752 product(bool, PrintVMQWaitTime, false, \
753 "Print out the waiting time in VM operation queue") \
754 \
755 develop(bool, TraceOopMapGeneration, false, \
756 "Show OopMapGeneration") \
757 \
758 product(bool, MethodFlushing, true, \
759 "Reclamation of zombie and not-entrant methods") \
760 \
761 develop(bool, VerifyStack, false, \
762 "Verify stack of each thread when it is entering a runtime call") \
763 \
764 diagnostic(bool, ForceUnreachable, false, \
765 "Make all non code cache addresses to be unreachable by " \
766 "forcing use of 64bit literal fixups") \
767 \
768 notproduct(bool, StressDerivedPointers, false, \
769 "Force scavenge when a derived pointer is detected on stack " \
770 "after rtm call") \
771 \
772 develop(bool, TraceDerivedPointers, false, \
773 "Trace traversal of derived pointers on stack") \
774 \
775 notproduct(bool, TraceCodeBlobStacks, false, \
776 "Trace stack-walk of codeblobs") \
777 \
778 product(bool, PrintJNIResolving, false, \
779 "Used to implement -v:jni") \
780 \
781 notproduct(bool, PrintRewrites, false, \
782 "Print methods that are being rewritten") \
783 \
784 product(bool, UseInlineCaches, true, \
785 "Use Inline Caches for virtual calls ") \
786 \
787 develop(bool, InlineArrayCopy, true, \
788 "Inline arraycopy native that is known to be part of " \
789 "base library DLL") \
790 \
791 develop(bool, InlineObjectHash, true, \
792 "Inline Object::hashCode() native that is known to be part " \
793 "of base library DLL") \
794 \
795 develop(bool, InlineNatives, true, \
796 "Inline natives that are known to be part of base library DLL") \
797 \
798 develop(bool, InlineMathNatives, true, \
799 "Inline SinD, CosD, etc.") \
800 \
801 develop(bool, InlineClassNatives, true, \
802 "Inline Class.isInstance, etc") \
803 \
804 develop(bool, InlineThreadNatives, true, \
805 "Inline Thread.currentThread, etc") \
806 \
807 develop(bool, InlineUnsafeOps, true, \
808 "Inline memory ops (native methods) from sun.misc.Unsafe") \
809 \
810 product(bool, CriticalJNINatives, true, \
811 "Check for critical JNI entry points") \
812 \
813 notproduct(bool, StressCriticalJNINatives, false, \
814 "Exercise register saving code in critical natives") \
815 \
816 product(bool, UseSSE42Intrinsics, false, \
817 "SSE4.2 versions of intrinsics") \
818 \
819 product(bool, UseAESIntrinsics, false, \
820 "Use intrinsics for AES versions of crypto") \
821 \
822 product(bool, UseSHA1Intrinsics, false, \
823 "Use intrinsics for SHA-1 crypto hash function. " \
824 "Requires that UseSHA is enabled.") \
825 \
826 product(bool, UseSHA256Intrinsics, false, \
827 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
828 "Requires that UseSHA is enabled.") \
829 \
830 product(bool, UseSHA512Intrinsics, false, \
831 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
832 "Requires that UseSHA is enabled.") \
833 \
834 product(bool, UseCRC32Intrinsics, false, \
835 "use intrinsics for java.util.zip.CRC32") \
836 \
837 product(bool, UseCRC32CIntrinsics, false, \
838 "use intrinsics for java.util.zip.CRC32C") \
839 \
840 diagnostic(ccstrlist, DisableIntrinsic, "", \
841 "do not expand intrinsics whose (internal) names appear here") \
842 \
843 develop(bool, TraceCallFixup, false, \
844 "Trace all call fixups") \
845 \
846 develop(bool, DeoptimizeALot, false, \
847 "Deoptimize at every exit from the runtime system") \
848 \
849 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
850 "A comma separated list of bcis to deoptimize at") \
851 \
852 product(bool, DeoptimizeRandom, false, \
853 "Deoptimize random frames on random exit from the runtime system")\
854 \
855 notproduct(bool, ZombieALot, false, \
856 "Create zombies (non-entrant) at exit from the runtime system") \
857 \
858 product(bool, UnlinkSymbolsALot, false, \
859 "Unlink unreferenced symbols from the symbol table at safepoints")\
860 \
861 notproduct(bool, WalkStackALot, false, \
862 "Trace stack (no print) at every exit from the runtime system") \
863 \
864 product(bool, Debugging, false, \
865 "Set when executing debug methods in debug.cpp " \
866 "(to prevent triggering assertions)") \
867 \
868 notproduct(bool, StrictSafepointChecks, trueInDebug, \
869 "Enable strict checks that safepoints cannot happen for threads " \
870 "that use No_Safepoint_Verifier") \
871 \
872 notproduct(bool, VerifyLastFrame, false, \
873 "Verify oops on last frame on entry to VM") \
874 \
875 develop(bool, TraceHandleAllocation, false, \
876 "Print out warnings when suspiciously many handles are allocated")\
877 \
878 product(bool, FailOverToOldVerifier, true, \
879 "Fail over to old verifier when split verifier fails") \
880 \
881 develop(bool, ShowSafepointMsgs, false, \
882 "Show message about safepoint synchronization") \
883 \
884 product(bool, SafepointTimeout, false, \
885 "Time out and warn or fail after SafepointTimeoutDelay " \
886 "milliseconds if failed to reach safepoint") \
887 \
888 develop(bool, DieOnSafepointTimeout, false, \
889 "Die upon failure to reach safepoint (see SafepointTimeout)") \
890 \
891 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
892 /* typically, at most a few retries are needed */ \
893 product(intx, SuspendRetryCount, 50, \
894 "Maximum retry count for an external suspend request") \
895 \
896 product(intx, SuspendRetryDelay, 5, \
897 "Milliseconds to delay per retry (* current_retry_count)") \
898 \
899 product(bool, AssertOnSuspendWaitFailure, false, \
900 "Assert/Guarantee on external suspend wait failure") \
901 \
902 product(bool, TraceSuspendWaitFailures, false, \
903 "Trace external suspend wait failures") \
904 \
905 product(bool, MaxFDLimit, true, \
906 "Bump the number of file descriptors to maximum in Solaris") \
907 \
908 diagnostic(bool, LogEvents, true, \
909 "Enable the various ring buffer event logs") \
910 \
911 diagnostic(uintx, LogEventsBufferEntries, 10, \
912 "Number of ring buffer event logs") \
913 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
914 \
915 product(bool, BytecodeVerificationRemote, true, \
916 "Enable the Java bytecode verifier for remote classes") \
917 \
918 product(bool, BytecodeVerificationLocal, false, \
919 "Enable the Java bytecode verifier for local classes") \
920 \
921 develop(bool, ForceFloatExceptions, trueInDebug, \
922 "Force exceptions on FP stack under/overflow") \
923 \
924 develop(bool, VerifyStackAtCalls, false, \
925 "Verify that the stack pointer is unchanged after calls") \
926 \
927 develop(bool, TraceJavaAssertions, false, \
928 "Trace java language assertions") \
929 \
930 notproduct(bool, CheckAssertionStatusDirectives, false, \
931 "Temporary - see javaClasses.cpp") \
932 \
933 notproduct(bool, PrintMallocFree, false, \
934 "Trace calls to C heap malloc/free allocation") \
935 \
936 product(bool, PrintOopAddress, false, \
937 "Always print the location of the oop") \
938 \
939 notproduct(bool, VerifyCodeCache, false, \
940 "Verify code cache on memory allocation/deallocation") \
941 \
942 develop(bool, ZapDeadCompiledLocals, false, \
943 "Zap dead locals in compiler frames") \
944 \
945 notproduct(bool, ZapDeadLocalsOld, false, \
946 "Zap dead locals (old version, zaps all frames when " \
947 "entering the VM") \
948 \
949 notproduct(bool, CheckOopishValues, false, \
950 "Warn if value contains oop (requires ZapDeadLocals)") \
951 \
952 develop(bool, UseMallocOnly, false, \
953 "Use only malloc/free for allocation (no resource area/arena)") \
954 \
955 develop(bool, PrintMalloc, false, \
956 "Print all malloc/free calls") \
957 \
958 develop(bool, PrintMallocStatistics, false, \
959 "Print malloc/free statistics") \
960 \
961 develop(bool, ZapResourceArea, trueInDebug, \
962 "Zap freed resource/arena space with 0xABABABAB") \
963 \
964 notproduct(bool, ZapVMHandleArea, trueInDebug, \
965 "Zap freed VM handle space with 0xBCBCBCBC") \
966 \
967 develop(bool, ZapJNIHandleArea, trueInDebug, \
968 "Zap freed JNI handle space with 0xFEFEFEFE") \
969 \
970 notproduct(bool, ZapStackSegments, trueInDebug, \
971 "Zap allocated/freed stack segments with 0xFADFADED") \
972 \
973 develop(bool, ZapUnusedHeapArea, trueInDebug, \
974 "Zap unused heap space with 0xBAADBABE") \
975 \
976 develop(bool, TraceZapUnusedHeapArea, false, \
977 "Trace zapping of unused heap space") \
978 \
979 develop(bool, CheckZapUnusedHeapArea, false, \
980 "Check zapping of unused heap space") \
981 \
982 develop(bool, ZapFillerObjects, trueInDebug, \
983 "Zap filler objects with 0xDEAFBABE") \
984 \
985 develop(bool, PrintVMMessages, true, \
986 "Print VM messages on console") \
987 \
988 product(bool, PrintGCApplicationConcurrentTime, false, \
989 "Print the time the application has been running") \
990 \
991 product(bool, PrintGCApplicationStoppedTime, false, \
992 "Print the time the application has been stopped") \
993 \
994 diagnostic(bool, VerboseVerification, false, \
995 "Display detailed verification details") \
996 \
997 notproduct(uintx, ErrorHandlerTest, 0, \
998 "If > 0, provokes an error after VM initialization; the value " \
999 "determines which error to provoke. See test_error_handler() " \
1000 "in debug.cpp.") \
1001 \
1002 notproduct(uintx, TestCrashInErrorHandler, 0, \
1003 "If > 0, provokes an error inside VM error handler (a secondary " \
1004 "crash). see test_error_handler() in debug.cpp.") \
1005 \
1006 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1007 "If true, tests SafeFetch inside error handler.") \
1008 \
1009 develop(bool, Verbose, false, \
1010 "Print additional debugging information from other modes") \
1011 \
1012 develop(bool, PrintMiscellaneous, false, \
1013 "Print uncategorized debugging information (requires +Verbose)") \
1014 \
1015 develop(bool, WizardMode, false, \
1016 "Print much more debugging information") \
1017 \
1018 product(bool, ShowMessageBoxOnError, false, \
1019 "Keep process alive on VM fatal error") \
1020 \
1021 product(bool, CreateCoredumpOnCrash, true, \
1022 "Create core/mini dump on VM fatal error") \
1023 \
1024 product(uintx, ErrorLogTimeout, 2 * 60, \
1025 "Timeout, in seconds, to limit the time spent on writing an " \
1026 "error log in case of a crash.") \
1027 \
1028 product_pd(bool, UseOSErrorReporting, \
1029 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1030 \
1031 product(bool, SuppressFatalErrorMessage, false, \
1032 "Report NO fatal error message (avoid deadlock)") \
1033 \
1034 product(ccstrlist, OnError, "", \
1035 "Run user-defined commands on fatal error; see VMError.cpp " \
1036 "for examples") \
1037 \
1038 product(ccstrlist, OnOutOfMemoryError, "", \
1039 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1040 \
1041 manageable(bool, HeapDumpBeforeFullGC, false, \
1042 "Dump heap to file before any major stop-the-world GC") \
1043 \
1044 manageable(bool, HeapDumpAfterFullGC, false, \
1045 "Dump heap to file after any major stop-the-world GC") \
1046 \
1047 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1048 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1049 \
1050 manageable(ccstr, HeapDumpPath, NULL, \
1051 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1052 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1053 "in the working directory)") \
1054 \
1055 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1056 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1057 "when the heap usage is larger than this") \
1058 \
1059 develop(size_t, HeapDumpSegmentSize, 1*G, \
1060 "Approximate segment size when generating a segmented heap dump") \
1061 \
1062 develop(bool, BreakAtWarning, false, \
1063 "Execute breakpoint upon encountering VM warning") \
1064 \
1065 develop(bool, TraceVMOperation, false, \
1066 "Trace VM operations") \
1067 \
1068 develop(bool, UseFakeTimers, false, \
1069 "Tell whether the VM should use system time or a fake timer") \
1070 \
1071 product(ccstr, NativeMemoryTracking, "off", \
1072 "Native memory tracking options") \
1073 \
1074 diagnostic(bool, PrintNMTStatistics, false, \
1075 "Print native memory tracking summary data if it is on") \
1076 \
1077 diagnostic(bool, LogCompilation, false, \
1078 "Log compilation activity in detail to LogFile") \
1079 \
1080 product(bool, PrintCompilation, false, \
1081 "Print compilations") \
1082 \
1083 diagnostic(bool, TraceNMethodInstalls, false, \
1084 "Trace nmethod installation") \
1085 \
1086 diagnostic(intx, ScavengeRootsInCode, 2, \
1087 "0: do not allow scavengable oops in the code cache; " \
1088 "1: allow scavenging from the code cache; " \
1089 "2: emit as many constants as the compiler can see") \
1090 range(0, 2) \
1091 \
1092 product(bool, AlwaysRestoreFPU, false, \
1093 "Restore the FPU control word after every JNI call (expensive)") \
1094 \
1095 product(bool, MemoryMapImage, false, \
1096 "Memory map entire runtime image") \
1097 \
1098 diagnostic(bool, PrintCompilation2, false, \
1099 "Print additional statistics per compilation") \
1100 \
1101 diagnostic(bool, PrintAdapterHandlers, false, \
1102 "Print code generated for i2c/c2i adapters") \
1103 \
1104 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1105 "Verify that i2c/c2i adapters are called properly") \
1106 \
1107 develop(bool, VerifyAdapterSharing, false, \
1108 "Verify that the code for shared adapters is the equivalent") \
1109 \
1110 diagnostic(bool, PrintAssembly, false, \
1111 "Print assembly code (using external disassembler.so)") \
1112 \
1113 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1114 "Print options string passed to disassembler.so") \
1115 \
1116 diagnostic(bool, PrintNMethods, false, \
1117 "Print assembly code for nmethods when generated") \
1118 \
1119 diagnostic(bool, PrintNativeNMethods, false, \
1120 "Print assembly code for native nmethods when generated") \
1121 \
1122 develop(bool, PrintDebugInfo, false, \
1123 "Print debug information for all nmethods when generated") \
1124 \
1125 develop(bool, PrintRelocations, false, \
1126 "Print relocation information for all nmethods when generated") \
1127 \
1128 develop(bool, PrintDependencies, false, \
1129 "Print dependency information for all nmethods when generated") \
1130 \
1131 develop(bool, PrintExceptionHandlers, false, \
1132 "Print exception handler tables for all nmethods when generated") \
1133 \
1134 develop(bool, StressCompiledExceptionHandlers, false, \
1135 "Exercise compiled exception handlers") \
1136 \
1137 develop(bool, InterceptOSException, false, \
1138 "Start debugger when an implicit OS (e.g. NULL) " \
1139 "exception happens") \
1140 \
1141 product(bool, PrintCodeCache, false, \
1142 "Print the code cache memory usage when exiting") \
1143 \
1144 develop(bool, PrintCodeCache2, false, \
1145 "Print detailed usage information on the code cache when exiting")\
1146 \
1147 product(bool, PrintCodeCacheOnCompilation, false, \
1148 "Print the code cache memory usage each time a method is " \
1149 "compiled") \
1150 \
1151 diagnostic(bool, PrintStubCode, false, \
1152 "Print generated stub code") \
1153 \
1154 product(bool, StackTraceInThrowable, true, \
1155 "Collect backtrace in throwable when exception happens") \
1156 \
1157 product(bool, OmitStackTraceInFastThrow, true, \
1158 "Omit backtraces for some 'hot' exceptions in optimized code") \
1159 \
1160 product(bool, ProfilerPrintByteCodeStatistics, false, \
1161 "Print bytecode statistics when dumping profiler output") \
1162 \
1163 product(bool, ProfilerRecordPC, false, \
1164 "Collect ticks for each 16 byte interval of compiled code") \
1165 \
1166 product(bool, ProfileVM, false, \
1167 "Profile ticks that fall within VM (either in the VM Thread " \
1168 "or VM code called through stubs)") \
1169 \
1170 product(bool, ProfileIntervals, false, \
1171 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1172 \
1173 notproduct(bool, ProfilerCheckIntervals, false, \
1174 "Collect and print information on spacing of profiler ticks") \
1175 \
1176 product(bool, PrintWarnings, true, \
1177 "Print JVM warnings to output stream") \
1178 \
1179 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1180 "Print warnings for stalled SpinLocks") \
1181 \
1182 product(bool, RegisterFinalizersAtInit, true, \
1183 "Register finalizable objects at end of Object.<init> or " \
1184 "after allocation") \
1185 \
1186 develop(bool, RegisterReferences, true, \
1187 "Tell whether the VM should register soft/weak/final/phantom " \
1188 "references") \
1189 \
1190 develop(bool, IgnoreRewrites, false, \
1191 "Suppress rewrites of bytecodes in the oopmap generator. " \
1192 "This is unsafe!") \
1193 \
1194 develop(bool, PrintCodeCacheExtension, false, \
1195 "Print extension of code cache") \
1196 \
1197 develop(bool, UsePrivilegedStack, true, \
1198 "Enable the security JVM functions") \
1199 \
1200 develop(bool, ProtectionDomainVerification, true, \
1201 "Verify protection domain before resolution in system dictionary")\
1202 \
1203 product(bool, ClassUnloading, true, \
1204 "Do unloading of classes") \
1205 \
1206 product(bool, ClassUnloadingWithConcurrentMark, true, \
1207 "Do unloading of classes with a concurrent marking cycle") \
1208 \
1209 develop(bool, DisableStartThread, false, \
1210 "Disable starting of additional Java threads " \
1211 "(for debugging only)") \
1212 \
1213 develop(bool, MemProfiling, false, \
1214 "Write memory usage profiling to log file") \
1215 \
1216 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1217 "Print the system dictionary at exit") \
1218 \
1219 experimental(intx, PredictedLoadedClassCount, 0, \
1220 "Experimental: Tune loaded class cache starting size") \
1221 \
1222 diagnostic(bool, UnsyncloadClass, false, \
1223 "Unstable: VM calls loadClass unsynchronized. Custom " \
1224 "class loader must call VM synchronized for findClass " \
1225 "and defineClass.") \
1226 \
1227 product(bool, AlwaysLockClassLoader, false, \
1228 "Require the VM to acquire the class loader lock before calling " \
1229 "loadClass() even for class loaders registering " \
1230 "as parallel capable") \
1231 \
1232 product(bool, AllowParallelDefineClass, false, \
1233 "Allow parallel defineClass requests for class loaders " \
1234 "registering as parallel capable") \
1235 \
1236 product(bool, MustCallLoadClassInternal, false, \
1237 "Call loadClassInternal() rather than loadClass()") \
1238 \
1239 product_pd(bool, DontYieldALot, \
1240 "Throw away obvious excess yield calls") \
1241 \
1242 product_pd(bool, ConvertSleepToYield, \
1243 "Convert sleep(0) to thread yield " \
1244 "(may be off for Solaris to improve GUI)") \
1245 \
1246 product(bool, ConvertYieldToSleep, false, \
1247 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1248 "behavior") \
1249 \
1250 develop(bool, UseDetachedThreads, true, \
1251 "Use detached threads that are recycled upon termination " \
1252 "(for Solaris only)") \
1253 \
1254 product(bool, UseLWPSynchronization, true, \
1255 "Use LWP-based instead of libthread-based synchronization " \
1256 "(SPARC only)") \
1257 \
1258 experimental(ccstr, SyncKnobs, NULL, \
1259 "(Unstable) Various monitor synchronization tunables") \
1260 \
1261 experimental(intx, EmitSync, 0, \
1262 "(Unsafe, Unstable) " \
1263 "Control emission of inline sync fast-path code") \
1264 \
1265 product(intx, MonitorBound, 0, "Bound Monitor population") \
1266 \
1267 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1268 \
1269 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1270 "Experimental Sync flags") \
1271 \
1272 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1273 \
1274 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1275 \
1276 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1277 \
1278 experimental(intx, hashCode, 5, \
1279 "(Unstable) select hashCode generation algorithm") \
1280 \
1281 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1282 "(Unstable, Linux-specific) " \
1283 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1284 \
1285 product(bool, FilterSpuriousWakeups, true, \
1286 "When true prevents OS-level spurious, or premature, wakeups " \
1287 "from Object.wait (Ignored for Windows)") \
1288 \
1289 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1290 \
1291 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1292 \
1293 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1294 \
1295 develop(bool, UsePthreads, false, \
1296 "Use pthread-based instead of libthread-based synchronization " \
1297 "(SPARC only)") \
1298 \
1299 product(bool, ReduceSignalUsage, false, \
1300 "Reduce the use of OS signals in Java and/or the VM") \
1301 \
1302 develop_pd(bool, ShareVtableStubs, \
1303 "Share vtable stubs (smaller code but worse branch prediction") \
1304 \
1305 develop(bool, LoadLineNumberTables, true, \
1306 "Tell whether the class file parser loads line number tables") \
1307 \
1308 develop(bool, LoadLocalVariableTables, true, \
1309 "Tell whether the class file parser loads local variable tables") \
1310 \
1311 develop(bool, LoadLocalVariableTypeTables, true, \
1312 "Tell whether the class file parser loads local variable type" \
1313 "tables") \
1314 \
1315 product(bool, AllowUserSignalHandlers, false, \
1316 "Do not complain if the application installs signal handlers " \
1317 "(Solaris & Linux only)") \
1318 \
1319 product(bool, UseSignalChaining, true, \
1320 "Use signal-chaining to invoke signal handlers installed " \
1321 "by the application (Solaris & Linux only)") \
1322 \
1323 product(bool, UseAltSigs, false, \
1324 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1325 "internal signals (Solaris only)") \
1326 \
1327 product(bool, AllowJNIEnvProxy, false, \
1328 "Allow JNIEnv proxies for jdbx") \
1329 \
1330 product(bool, JNIDetachReleasesMonitors, true, \
1331 "JNI DetachCurrentThread releases monitors owned by thread") \
1332 \
1333 product(bool, RestoreMXCSROnJNICalls, false, \
1334 "Restore MXCSR when returning from JNI calls") \
1335 \
1336 product(bool, CheckJNICalls, false, \
1337 "Verify all arguments to JNI calls") \
1338 \
1339 product(bool, CheckEndorsedAndExtDirs, false, \
1340 "Verify the endorsed and extension directories are not used") \
1341 \
1342 product(bool, UseFastJNIAccessors, true, \
1343 "Use optimized versions of Get<Primitive>Field") \
1344 \
1345 product(intx, MaxJNILocalCapacity, 65536, \
1346 "Maximum allowable local JNI handle capacity to " \
1347 "EnsureLocalCapacity() and PushLocalFrame(), " \
1348 "where <= 0 is unlimited, default: 65536") \
1349 \
1350 product(bool, EagerXrunInit, false, \
1351 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1352 "but not all -Xrun libraries may support the state of the VM " \
1353 "at this time") \
1354 \
1355 product(bool, PreserveAllAnnotations, false, \
1356 "Preserve RuntimeInvisibleAnnotations as well " \
1357 "as RuntimeVisibleAnnotations") \
1358 \
1359 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1360 "Number of OutOfMemoryErrors preallocated with backtrace") \
1361 \
1362 product(bool, UseXMMForArrayCopy, false, \
1363 "Use SSE2 MOVQ instruction for Arraycopy") \
1364 \
1365 product(intx, FieldsAllocationStyle, 1, \
1366 "0 - type based with oops first, " \
1367 "1 - with oops last, " \
1368 "2 - oops in super and sub classes are together") \
1369 range(0, 2) \
1370 \
1371 product(bool, CompactFields, true, \
1372 "Allocate nonstatic fields in gaps between previous fields") \
1373 \
1374 notproduct(bool, PrintFieldLayout, false, \
1375 "Print field layout for each class") \
1376 \
1377 /* Need to limit the extent of the padding to reasonable size. */\
1378 /* 8K is well beyond the reasonable HW cache line size, even with */\
1379 /* aggressive prefetching, while still leaving the room for segregating */\
1380 /* among the distinct pages. */\
1381 product(intx, ContendedPaddingWidth, 128, \
1382 "How many bytes to pad the fields/classes marked @Contended with")\
1383 range(0, 8192) \
1384 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \
1385 \
1386 product(bool, EnableContended, true, \
1387 "Enable @Contended annotation support") \
1388 \
1389 product(bool, RestrictContended, true, \
1390 "Restrict @Contended to trusted classes") \
1391 \
1392 product(bool, UseBiasedLocking, true, \
1393 "Enable biased locking in JVM") \
1394 \
1395 product(intx, BiasedLockingStartupDelay, 4000, \
1396 "Number of milliseconds to wait before enabling biased locking") \
1397 \
1398 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1399 "Print statistics of biased locking in JVM") \
1400 \
1401 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1402 "Threshold of number of revocations per type to try to " \
1403 "rebias all objects in the heap of that type") \
1404 \
1405 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1406 "Threshold of number of revocations per type to permanently " \
1407 "revoke biases of all objects in the heap of that type") \
1408 \
1409 product(intx, BiasedLockingDecayTime, 25000, \
1410 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1411 "type after previous bulk rebias") \
1412 \
1413 /* tracing */ \
1414 \
1415 notproduct(bool, TraceRuntimeCalls, false, \
1416 "Trace run-time calls") \
1417 \
1418 develop(bool, TraceJNICalls, false, \
1419 "Trace JNI calls") \
1420 \
1421 develop(bool, StressRewriter, false, \
1422 "Stress linktime bytecode rewriting") \
1423 \
1424 notproduct(bool, TraceJVMCalls, false, \
1425 "Trace JVM calls") \
1426 \
1427 product(ccstr, TraceJVMTI, NULL, \
1428 "Trace flags for JVMTI functions and events") \
1429 \
1430 /* This option can change an EMCP method into an obsolete method. */ \
1431 /* This can affect tests that except specific methods to be EMCP. */ \
1432 /* This option should be used with caution. */ \
1433 product(bool, StressLdcRewrite, false, \
1434 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1435 \
1436 product(intx, TraceRedefineClasses, 0, \
1437 "Trace level for JVMTI RedefineClasses") \
1438 \
1439 /* change to false by default sometime after Mustang */ \
1440 product(bool, VerifyMergedCPBytecodes, true, \
1441 "Verify bytecodes after RedefineClasses constant pool merging") \
1442 \
1443 develop(bool, TraceJNIHandleAllocation, false, \
1444 "Trace allocation/deallocation of JNI handle blocks") \
1445 \
1446 develop(bool, TraceBytecodes, false, \
1447 "Trace bytecode execution") \
1448 \
1449 develop(bool, TraceClassInitialization, false, \
1450 "Trace class initialization") \
1451 \
1452 product(bool, TraceExceptions, false, \
1453 "Trace exceptions") \
1454 \
1455 develop(bool, TraceICs, false, \
1456 "Trace inline cache changes") \
1457 \
1458 notproduct(bool, TraceInvocationCounterOverflow, false, \
1459 "Trace method invocation counter overflow") \
1460 \
1461 develop(bool, TraceInlineCacheClearing, false, \
1462 "Trace clearing of inline caches in nmethods") \
1463 \
1464 develop(bool, TraceDependencies, false, \
1465 "Trace dependencies") \
1466 \
1467 develop(bool, VerifyDependencies, trueInDebug, \
1468 "Exercise and verify the compilation dependency mechanism") \
1469 \
1470 develop(bool, TraceNewOopMapGeneration, false, \
1471 "Trace OopMapGeneration") \
1472 \
1473 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1474 "Trace OopMapGeneration: print detailed cell states") \
1475 \
1476 develop(bool, TimeOopMap, false, \
1477 "Time calls to GenerateOopMap::compute_map() in sum") \
1478 \
1479 develop(bool, TimeOopMap2, false, \
1480 "Time calls to GenerateOopMap::compute_map() individually") \
1481 \
1482 develop(bool, TraceMonitorMismatch, false, \
1483 "Trace monitor matching failures during OopMapGeneration") \
1484 \
1485 develop(bool, TraceOopMapRewrites, false, \
1486 "Trace rewriting of method oops during oop map generation") \
1487 \
1488 develop(bool, TraceSafepoint, false, \
1489 "Trace safepoint operations") \
1490 \
1491 develop(bool, TraceICBuffer, false, \
1492 "Trace usage of IC buffer") \
1493 \
1494 develop(bool, TraceCompiledIC, false, \
1495 "Trace changes of compiled IC") \
1496 \
1497 notproduct(bool, TraceZapDeadLocals, false, \
1498 "Trace zapping dead locals") \
1499 \
1500 develop(bool, TraceStartupTime, false, \
1501 "Trace setup time") \
1502 \
1503 develop(bool, TraceProtectionDomainVerification, false, \
1504 "Trace protection domain verification") \
1505 \
1506 develop(bool, TraceClearedExceptions, false, \
1507 "Print when an exception is forcibly cleared") \
1508 \
1509 product(bool, TraceClassResolution, false, \
1510 "Trace all constant pool resolutions (for debugging)") \
1511 \
1512 product(bool, TraceBiasedLocking, false, \
1513 "Trace biased locking in JVM") \
1514 \
1515 product(bool, TraceMonitorInflation, false, \
1516 "Trace monitor inflation in JVM") \
1517 \
1518 /* gc */ \
1519 \
1520 product(bool, UseSerialGC, false, \
1521 "Use the Serial garbage collector") \
1522 \
1523 product(bool, UseG1GC, false, \
1524 "Use the Garbage-First garbage collector") \
1525 \
1526 product(bool, UseParallelGC, false, \
1527 "Use the Parallel Scavenge garbage collector") \
1528 \
1529 product(bool, UseParallelOldGC, false, \
1530 "Use the Parallel Old garbage collector") \
1531 \
1532 product(uintx, HeapMaximumCompactionInterval, 20, \
1533 "How often should we maximally compact the heap (not allowing " \
1534 "any dead space)") \
1535 \
1536 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1537 "The collection count for the first maximum compaction") \
1538 \
1539 product(bool, UseMaximumCompactionOnSystemGC, true, \
1540 "Use maximum compaction in the Parallel Old garbage collector " \
1541 "for a system GC") \
1542 \
1543 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1544 "The mean used by the parallel compact dead wood " \
1545 "limiter (a number between 0-100)") \
1546 range(0, 100) \
1547 \
1548 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1549 "The standard deviation used by the parallel compact dead wood " \
1550 "limiter (a number between 0-100)") \
1551 range(0, 100) \
1552 \
1553 product(uint, ParallelGCThreads, 0, \
1554 "Number of parallel threads parallel gc will use") \
1555 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1556 \
1557 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1558 "Use semaphore synchronization for the GC Threads, " \
1559 "instead of synchronization based on mutexes") \
1560 \
1561 product(bool, UseDynamicNumberOfGCThreads, false, \
1562 "Dynamically choose the number of parallel threads " \
1563 "parallel gc will use") \
1564 \
1565 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1566 "Force dynamic selection of the number of " \
1567 "parallel threads parallel gc will use to aid debugging") \
1568 \
1569 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1570 "Size of heap (bytes) per GC thread used in calculating the " \
1571 "number of GC threads") \
1572 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1573 \
1574 product(bool, TraceDynamicGCThreads, false, \
1575 "Trace the dynamic GC thread usage") \
1576 \
1577 develop(bool, ParallelOldGCSplitALot, false, \
1578 "Provoke splitting (copying data from a young gen space to " \
1579 "multiple destination spaces)") \
1580 \
1581 develop(uintx, ParallelOldGCSplitInterval, 3, \
1582 "How often to provoke splitting a young gen space") \
1583 range(0, max_uintx) \
1584 \
1585 product(uint, ConcGCThreads, 0, \
1586 "Number of threads concurrent gc will use") \
1587 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1588 \
1589 product(uintx, GCTaskTimeStampEntries, 200, \
1590 "Number of time stamp entries per gc worker thread") \
1591 range(1, max_uintx) \
1592 \
1593 product(bool, AlwaysTenure, false, \
1594 "Always tenure objects in eden (ParallelGC only)") \
1595 \
1596 product(bool, NeverTenure, false, \
1597 "Never tenure objects in eden, may tenure on overflow " \
1598 "(ParallelGC only)") \
1599 \
1600 product(bool, ScavengeBeforeFullGC, true, \
1601 "Scavenge youngest generation before each full GC.") \
1602 \
1603 develop(bool, ScavengeWithObjectsInToSpace, false, \
1604 "Allow scavenges to occur when to-space contains objects") \
1605 \
1606 product(bool, UseConcMarkSweepGC, false, \
1607 "Use Concurrent Mark-Sweep GC in the old generation") \
1608 \
1609 product(bool, ExplicitGCInvokesConcurrent, false, \
1610 "A System.gc() request invokes a concurrent collection; " \
1611 "(effective only when using concurrent collectors)") \
1612 \
1613 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1614 "A System.gc() request invokes a concurrent collection and " \
1615 "also unloads classes during such a concurrent gc cycle " \
1616 "(effective only when UseConcMarkSweepGC)") \
1617 \
1618 product(bool, GCLockerInvokesConcurrent, false, \
1619 "The exit of a JNI critical section necessitating a scavenge, " \
1620 "also kicks off a background concurrent collection") \
1621 \
1622 product(uintx, GCLockerEdenExpansionPercent, 5, \
1623 "How much the GC can expand the eden by while the GC locker " \
1624 "is active (as a percentage)") \
1625 range(0, 100) \
1626 \
1627 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1628 "Number of times to retry allocations when " \
1629 "blocked by the GC locker") \
1630 \
1631 develop(bool, UseCMSAdaptiveFreeLists, true, \
1632 "Use adaptive free lists in the CMS generation") \
1633 \
1634 develop(bool, UseAsyncConcMarkSweepGC, true, \
1635 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1636 \
1637 product(bool, UseCMSBestFit, true, \
1638 "Use CMS best fit allocation strategy") \
1639 \
1640 product(bool, UseParNewGC, false, \
1641 "Use parallel threads in the new generation") \
1642 \
1643 product(bool, PrintTaskqueue, false, \
1644 "Print taskqueue statistics for parallel collectors") \
1645 \
1646 product(bool, PrintTerminationStats, false, \
1647 "Print termination statistics for parallel collectors") \
1648 \
1649 product(uintx, ParallelGCBufferWastePct, 10, \
1650 "Wasted fraction of parallel allocation buffer") \
1651 range(0, 100) \
1652 \
1653 product(uintx, TargetPLABWastePct, 10, \
1654 "Target wasted space in last buffer as percent of overall " \
1655 "allocation") \
1656 range(1, 100) \
1657 \
1658 product(uintx, PLABWeight, 75, \
1659 "Percentage (0-100) used to weight the current sample when " \
1660 "computing exponentially decaying average for ResizePLAB") \
1661 range(0, 100) \
1662 \
1663 product(bool, ResizePLAB, true, \
1664 "Dynamically resize (survivor space) promotion LAB's") \
1665 \
1666 product(bool, PrintPLAB, false, \
1667 "Print (survivor space) promotion LAB's sizing decisions") \
1668 \
1669 product(intx, ParGCArrayScanChunk, 50, \
1670 "Scan a subset of object array and push remainder, if array is " \
1671 "bigger than this") \
1672 range(1, max_intx) \
1673 \
1674 product(bool, ParGCUseLocalOverflow, false, \
1675 "Instead of a global overflow list, use local overflow stacks") \
1676 \
1677 product(bool, ParGCTrimOverflow, true, \
1678 "Eagerly trim the local overflow lists " \
1679 "(when ParGCUseLocalOverflow)") \
1680 \
1681 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1682 "Simulate work queue overflow in ParNew") \
1683 \
1684 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1685 "An `interval' counter that determines how frequently " \
1686 "we simulate overflow; a smaller number increases frequency") \
1687 \
1688 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1689 "The desired number of objects to claim from the overflow list") \
1690 \
1691 diagnostic(uintx, ParGCStridesPerThread, 2, \
1692 "The number of strides per worker thread that we divide up the " \
1693 "card table scanning work into") \
1694 range(1, max_uintx) \
1695 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1696 \
1697 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1698 "The number of cards in each chunk of the parallel chunks used " \
1699 "during card table scanning") \
1700 range(1, max_intx) \
1701 \
1702 product(uintx, OldPLABWeight, 50, \
1703 "Percentage (0-100) used to weight the current sample when " \
1704 "computing exponentially decaying average for resizing " \
1705 "OldPLABSize") \
1706 range(0, 100) \
1707 \
1708 product(bool, ResizeOldPLAB, true, \
1709 "Dynamically resize (old gen) promotion LAB's") \
1710 \
1711 product(bool, PrintOldPLAB, false, \
1712 "Print (old gen) promotion LAB's sizing decisions") \
1713 \
1714 product(size_t, CMSOldPLABMax, 1024, \
1715 "Maximum size of CMS gen promotion LAB caches per worker " \
1716 "per block size") \
1717 range(1, max_uintx) \
1718 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1719 \
1720 product(size_t, CMSOldPLABMin, 16, \
1721 "Minimum size of CMS gen promotion LAB caches per worker " \
1722 "per block size") \
1723 range(1, max_uintx) \
1724 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1725 \
1726 product(uintx, CMSOldPLABNumRefills, 4, \
1727 "Nominal number of refills of CMS gen promotion LAB cache " \
1728 "per worker per block size") \
1729 range(1, max_uintx) \
1730 \
1731 product(bool, CMSOldPLABResizeQuicker, false, \
1732 "React on-the-fly during a scavenge to a sudden " \
1733 "change in block demand rate") \
1734 \
1735 product(uintx, CMSOldPLABToleranceFactor, 4, \
1736 "The tolerance of the phase-change detector for on-the-fly " \
1737 "PLAB resizing during a scavenge") \
1738 range(1, max_uintx) \
1739 \
1740 product(uintx, CMSOldPLABReactivityFactor, 2, \
1741 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1742 "during a scavenge") \
1743 \
1744 product(bool, AlwaysPreTouch, false, \
1745 "Force all freshly committed pages to be pre-touched") \
1746 \
1747 product_pd(size_t, CMSYoungGenPerWorker, \
1748 "The maximum size of young gen chosen by default per GC worker " \
1749 "thread available") \
1750 range(1, max_uintx) \
1751 \
1752 product(uintx, CMSIncrementalSafetyFactor, 10, \
1753 "Percentage (0-100) used to add conservatism when computing the " \
1754 "duty cycle") \
1755 range(0, 100) \
1756 \
1757 product(uintx, CMSExpAvgFactor, 50, \
1758 "Percentage (0-100) used to weight the current sample when " \
1759 "computing exponential averages for CMS statistics") \
1760 range(0, 100) \
1761 \
1762 product(uintx, CMS_FLSWeight, 75, \
1763 "Percentage (0-100) used to weight the current sample when " \
1764 "computing exponentially decaying averages for CMS FLS " \
1765 "statistics") \
1766 range(0, 100) \
1767 \
1768 product(uintx, CMS_FLSPadding, 1, \
1769 "The multiple of deviation from mean to use for buffering " \
1770 "against volatility in free list demand") \
1771 \
1772 product(uintx, FLSCoalescePolicy, 2, \
1773 "CMS: aggressiveness level for coalescing, increasing " \
1774 "from 0 to 4") \
1775 range(0, 4) \
1776 \
1777 product(bool, FLSAlwaysCoalesceLarge, false, \
1778 "CMS: larger free blocks are always available for coalescing") \
1779 \
1780 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1781 "CMS: the smaller the percentage the greater the coalescing " \
1782 "force") \
1783 range(0.0, 1.0) \
1784 \
1785 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1786 "CMS: the factor by which to inflate estimated demand of small " \
1787 "block sizes to prevent coalescing with an adjoining block") \
1788 range(0.0, DBL_MAX) \
1789 \
1790 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1791 "CMS: the factor by which to inflate estimated demand of large " \
1792 "block sizes to prevent coalescing with an adjoining block") \
1793 range(0.0, DBL_MAX) \
1794 \
1795 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1796 "CMS: the factor by which to inflate estimated demand of small " \
1797 "block sizes to prevent splitting to supply demand for smaller " \
1798 "blocks") \
1799 range(0.0, DBL_MAX) \
1800 \
1801 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1802 "CMS: the factor by which to inflate estimated demand of large " \
1803 "block sizes to prevent splitting to supply demand for smaller " \
1804 "blocks") \
1805 range(0.0, DBL_MAX) \
1806 \
1807 product(bool, CMSExtrapolateSweep, false, \
1808 "CMS: cushion for block demand during sweep") \
1809 \
1810 product(uintx, CMS_SweepWeight, 75, \
1811 "Percentage (0-100) used to weight the current sample when " \
1812 "computing exponentially decaying average for inter-sweep " \
1813 "duration") \
1814 range(0, 100) \
1815 \
1816 product(uintx, CMS_SweepPadding, 1, \
1817 "The multiple of deviation from mean to use for buffering " \
1818 "against volatility in inter-sweep duration") \
1819 \
1820 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1821 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1822 "duration exceeds this threshold in milliseconds") \
1823 \
1824 product(bool, CMSClassUnloadingEnabled, true, \
1825 "Whether class unloading enabled when using CMS GC") \
1826 \
1827 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1828 "When CMS class unloading is enabled, the maximum CMS cycle " \
1829 "count for which classes may not be unloaded") \
1830 \
1831 develop(intx, CMSDictionaryChoice, 0, \
1832 "Use BinaryTreeDictionary as default in the CMS generation") \
1833 range(0, 2) \
1834 \
1835 product(uintx, CMSIndexedFreeListReplenish, 4, \
1836 "Replenish an indexed free list with this number of chunks") \
1837 range(1, max_uintx) \
1838 \
1839 product(bool, CMSReplenishIntermediate, true, \
1840 "Replenish all intermediate free-list caches") \
1841 \
1842 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1843 "When satisfying batched demand, split blocks from the " \
1844 "IndexedFreeList whose size is a multiple of requested size") \
1845 \
1846 product(bool, CMSLoopWarn, false, \
1847 "Warn in case of excessive CMS looping") \
1848 \
1849 develop(bool, CMSOverflowEarlyRestoration, false, \
1850 "Restore preserved marks early") \
1851 \
1852 /* where does the range max value of (max_jint - 1) come from? */ \
1853 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1854 "Maximum size of marking stack") \
1855 range(1, (max_jint - 1)) \
1856 \
1857 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1858 "Size of marking stack") \
1859 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1860 \
1861 notproduct(bool, CMSMarkStackOverflowALot, false, \
1862 "Simulate frequent marking stack / work queue overflow") \
1863 \
1864 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1865 "An \"interval\" counter that determines how frequently " \
1866 "to simulate overflow; a smaller number increases frequency") \
1867 \
1868 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1869 "Maximum number of abortable preclean iterations, if > 0") \
1870 \
1871 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1872 "Maximum time in abortable preclean (in milliseconds)") \
1873 range(0, max_intx) \
1874 \
1875 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1876 "Nominal minimum work per abortable preclean iteration") \
1877 \
1878 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1879 "Time that we sleep between iterations when not given " \
1880 "enough work per iteration") \
1881 range(0, max_intx) \
1882 \
1883 product(size_t, CMSRescanMultiple, 32, \
1884 "Size (in cards) of CMS parallel rescan task") \
1885 range(1, max_uintx) \
1886 \
1887 product(size_t, CMSConcMarkMultiple, 32, \
1888 "Size (in cards) of CMS concurrent MT marking task") \
1889 range(1, max_uintx) \
1890 \
1891 product(bool, CMSAbortSemantics, false, \
1892 "Whether abort-on-overflow semantics is implemented") \
1893 \
1894 product(bool, CMSParallelInitialMarkEnabled, true, \
1895 "Use the parallel initial mark.") \
1896 \
1897 product(bool, CMSParallelRemarkEnabled, true, \
1898 "Whether parallel remark enabled (only if ParNewGC)") \
1899 \
1900 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1901 "Whether parallel remark of survivor space " \
1902 "enabled (effective only if CMSParallelRemarkEnabled)") \
1903 \
1904 product(bool, CMSPLABRecordAlways, true, \
1905 "Always record survivor space PLAB boundaries (effective only " \
1906 "if CMSParallelSurvivorRemarkEnabled)") \
1907 \
1908 product(bool, CMSEdenChunksRecordAlways, true, \
1909 "Always record eden chunks used for the parallel initial mark " \
1910 "or remark of eden") \
1911 \
1912 product(bool, CMSPrintEdenSurvivorChunks, false, \
1913 "Print the eden and the survivor chunks used for the parallel " \
1914 "initial mark or remark of the eden/survivor spaces") \
1915 \
1916 product(bool, CMSConcurrentMTEnabled, true, \
1917 "Whether multi-threaded concurrent work enabled " \
1918 "(effective only if ParNewGC)") \
1919 \
1920 product(bool, CMSPrecleaningEnabled, true, \
1921 "Whether concurrent precleaning enabled") \
1922 \
1923 product(uintx, CMSPrecleanIter, 3, \
1924 "Maximum number of precleaning iteration passes") \
1925 range(0, 9) \
1926 \
1927 product(uintx, CMSPrecleanDenominator, 3, \
1928 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1929 "ratio") \
1930 range(1, max_uintx) \
1931 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1932 \
1933 product(uintx, CMSPrecleanNumerator, 2, \
1934 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1935 "ratio") \
1936 range(0, max_uintx-1) \
1937 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1938 \
1939 product(bool, CMSPrecleanRefLists1, true, \
1940 "Preclean ref lists during (initial) preclean phase") \
1941 \
1942 product(bool, CMSPrecleanRefLists2, false, \
1943 "Preclean ref lists during abortable preclean phase") \
1944 \
1945 product(bool, CMSPrecleanSurvivors1, false, \
1946 "Preclean survivors during (initial) preclean phase") \
1947 \
1948 product(bool, CMSPrecleanSurvivors2, true, \
1949 "Preclean survivors during abortable preclean phase") \
1950 \
1951 product(uintx, CMSPrecleanThreshold, 1000, \
1952 "Do not iterate again if number of dirty cards is less than this")\
1953 range(100, max_uintx) \
1954 \
1955 product(bool, CMSCleanOnEnter, true, \
1956 "Clean-on-enter optimization for reducing number of dirty cards") \
1957 \
1958 product(uintx, CMSRemarkVerifyVariant, 1, \
1959 "Choose variant (1,2) of verification following remark") \
1960 range(1, 2) \
1961 \
1962 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1963 "If Eden size is below this, do not try to schedule remark") \
1964 \
1965 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1966 "The Eden occupancy percentage (0-100) at which " \
1967 "to try and schedule remark pause") \
1968 range(0, 100) \
1969 \
1970 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1971 "Start sampling eden top at least before young gen " \
1972 "occupancy reaches 1/<ratio> of the size at which " \
1973 "we plan to schedule remark") \
1974 range(1, max_uintx) \
1975 \
1976 product(uintx, CMSSamplingGrain, 16*K, \
1977 "The minimum distance between eden samples for CMS (see above)") \
1978 range(1, max_uintx) \
1979 \
1980 product(bool, CMSScavengeBeforeRemark, false, \
1981 "Attempt scavenge before the CMS remark step") \
1982 \
1983 develop(bool, CMSTraceSweeper, false, \
1984 "Trace some actions of the CMS sweeper") \
1985 \
1986 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1987 "Don't drain below this size per parallel worker/thief") \
1988 range(0, max_juint) \
1989 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1990 \
1991 manageable(intx, CMSWaitDuration, 2000, \
1992 "Time in milliseconds that CMS thread waits for young GC") \
1993 \
1994 develop(uintx, CMSCheckInterval, 1000, \
1995 "Interval in milliseconds that CMS thread checks if it " \
1996 "should start a collection cycle") \
1997 \
1998 product(bool, CMSYield, true, \
1999 "Yield between steps of CMS") \
2000 \
2001 product(size_t, CMSBitMapYieldQuantum, 10*M, \
2002 "Bitmap operations should process at most this many bits " \
2003 "between yields") \
2004 range(1, max_uintx) \
2005 \
2006 product(bool, CMSDumpAtPromotionFailure, false, \
2007 "Dump useful information about the state of the CMS old " \
2008 "generation upon a promotion failure") \
2009 \
2010 product(bool, CMSPrintChunksInDump, false, \
2011 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2012 "more detailed information about the free chunks") \
2013 \
2014 product(bool, CMSPrintObjectsInDump, false, \
2015 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2016 "more detailed information about the allocated objects") \
2017 \
2018 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
2019 "Verify that all references across the FLS boundary " \
2020 "are to valid objects") \
2021 \
2022 diagnostic(bool, FLSVerifyLists, false, \
2023 "Do lots of (expensive) FreeListSpace verification") \
2024 \
2025 diagnostic(bool, FLSVerifyIndexTable, false, \
2026 "Do lots of (expensive) FLS index table verification") \
2027 \
2028 develop(bool, FLSVerifyDictionary, false, \
2029 "Do lots of (expensive) FLS dictionary verification") \
2030 \
2031 develop(bool, VerifyBlockOffsetArray, false, \
2032 "Do (expensive) block offset array verification") \
2033 \
2034 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2035 "Maintain _unallocated_block in BlockOffsetArray " \
2036 "(currently applicable only to CMS collector)") \
2037 \
2038 develop(bool, TraceCMSState, false, \
2039 "Trace the state of the CMS collection") \
2040 \
2041 product(intx, RefDiscoveryPolicy, 0, \
2042 "Select type of reference discovery policy: " \
2043 "reference-based(0) or referent-based(1)") \
2044 range(ReferenceProcessor::DiscoveryPolicyMin, \
2045 ReferenceProcessor::DiscoveryPolicyMax) \
2046 \
2047 product(bool, ParallelRefProcEnabled, false, \
2048 "Enable parallel reference processing whenever possible") \
2049 \
2050 product(bool, ParallelRefProcBalancingEnabled, true, \
2051 "Enable balancing of reference processing queues") \
2052 \
2053 product(uintx, CMSTriggerRatio, 80, \
2054 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2055 "allocated before a CMS collection cycle commences") \
2056 range(0, 100) \
2057 \
2058 product(uintx, CMSBootstrapOccupancy, 50, \
2059 "Percentage CMS generation occupancy at which to " \
2060 "initiate CMS collection for bootstrapping collection stats") \
2061 range(0, 100) \
2062 \
2063 product(intx, CMSInitiatingOccupancyFraction, -1, \
2064 "Percentage CMS generation occupancy to start a CMS collection " \
2065 "cycle. A negative value means that CMSTriggerRatio is used") \
2066 range(min_intx, 100) \
2067 \
2068 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2069 "Percentage of the (entire) heap occupancy to start a " \
2070 "concurrent GC cycle. It is used by GCs that trigger a " \
2071 "concurrent GC cycle based on the occupancy of the entire heap, " \
2072 "not just one of the generations (e.g., G1). A value of 0 " \
2073 "denotes 'do constant GC cycles'.") \
2074 range(0, 100) \
2075 \
2076 manageable(intx, CMSTriggerInterval, -1, \
2077 "Commence a CMS collection cycle (at least) every so many " \
2078 "milliseconds (0 permanently, -1 disabled)") \
2079 range(-1, max_intx) \
2080 \
2081 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2082 "Only use occupancy as a criterion for starting a CMS collection")\
2083 \
2084 product(uintx, CMSIsTooFullPercentage, 98, \
2085 "An absolute ceiling above which CMS will always consider the " \
2086 "unloading of classes when class unloading is enabled") \
2087 range(0, 100) \
2088 \
2089 develop(bool, CMSTestInFreeList, false, \
2090 "Check if the coalesced range is already in the " \
2091 "free lists as claimed") \
2092 \
2093 notproduct(bool, CMSVerifyReturnedBytes, false, \
2094 "Check that all the garbage collected was returned to the " \
2095 "free lists") \
2096 \
2097 notproduct(bool, ScavengeALot, false, \
2098 "Force scavenge at every Nth exit from the runtime system " \
2099 "(N=ScavengeALotInterval)") \
2100 \
2101 develop(bool, FullGCALot, false, \
2102 "Force full gc at every Nth exit from the runtime system " \
2103 "(N=FullGCALotInterval)") \
2104 \
2105 notproduct(bool, GCALotAtAllSafepoints, false, \
2106 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2107 \
2108 product(bool, PrintPromotionFailure, false, \
2109 "Print additional diagnostic information following " \
2110 "promotion failure") \
2111 \
2112 notproduct(bool, PromotionFailureALot, false, \
2113 "Use promotion failure handling on every youngest generation " \
2114 "collection") \
2115 \
2116 develop(uintx, PromotionFailureALotCount, 1000, \
2117 "Number of promotion failures occurring at PLAB " \
2118 "refill attempts (ParNew) or promotion attempts " \
2119 "(other young collectors)") \
2120 \
2121 develop(uintx, PromotionFailureALotInterval, 5, \
2122 "Total collections between promotion failures a lot") \
2123 \
2124 experimental(uintx, WorkStealingSleepMillis, 1, \
2125 "Sleep time when sleep is used for yields") \
2126 \
2127 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2128 "Number of yields before a sleep is done during work stealing") \
2129 \
2130 experimental(uintx, WorkStealingHardSpins, 4096, \
2131 "Number of iterations in a spin loop between checks on " \
2132 "time out of hard spin") \
2133 \
2134 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2135 "Ratio of hard spins to calls to yield") \
2136 \
2137 develop(uintx, ObjArrayMarkingStride, 512, \
2138 "Number of object array elements to push onto the marking stack " \
2139 "before pushing a continuation entry") \
2140 \
2141 develop(bool, MetadataAllocationFailALot, false, \
2142 "Fail metadata allocations at intervals controlled by " \
2143 "MetadataAllocationFailALotInterval") \
2144 \
2145 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2146 "Metadata allocation failure a lot interval") \
2147 \
2148 develop(bool, TraceMetadataChunkAllocation, false, \
2149 "Trace chunk metadata allocations") \
2150 \
2151 product(bool, TraceMetadataHumongousAllocation, false, \
2152 "Trace humongous metadata allocations") \
2153 \
2154 develop(bool, TraceMetavirtualspaceAllocation, false, \
2155 "Trace virtual space metadata allocations") \
2156 \
2157 notproduct(bool, ExecuteInternalVMTests, false, \
2158 "Enable execution of internal VM tests") \
2159 \
2160 notproduct(bool, VerboseInternalVMTests, false, \
2161 "Turn on logging for internal VM tests.") \
2162 \
2163 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2164 \
2165 product_pd(bool, ResizeTLAB, \
2166 "Dynamically resize TLAB size for threads") \
2167 \
2168 product(bool, ZeroTLAB, false, \
2169 "Zero out the newly created TLAB") \
2170 \
2171 product(bool, FastTLABRefill, true, \
2172 "Use fast TLAB refill code") \
2173 \
2174 product(bool, PrintTLAB, false, \
2175 "Print various TLAB related information") \
2176 \
2177 product(bool, TLABStats, true, \
2178 "Provide more detailed and expensive TLAB statistics " \
2179 "(with PrintTLAB)") \
2180 \
2181 product_pd(bool, NeverActAsServerClassMachine, \
2182 "Never act like a server-class machine") \
2183 \
2184 product(bool, AlwaysActAsServerClassMachine, false, \
2185 "Always act like a server-class machine") \
2186 \
2187 product_pd(uint64_t, MaxRAM, \
2188 "Real memory size (in bytes) used to set maximum heap size") \
2189 \
2190 product(size_t, ErgoHeapSizeLimit, 0, \
2191 "Maximum ergonomically set heap size (in bytes); zero means use " \
2192 "MaxRAM / MaxRAMFraction") \
2193 \
2194 product(uintx, MaxRAMFraction, 4, \
2195 "Maximum fraction (1/n) of real memory used for maximum heap " \
2196 "size") \
2197 range(1, max_uintx) \
2198 \
2199 product(uintx, DefaultMaxRAMFraction, 4, \
2200 "Maximum fraction (1/n) of real memory used for maximum heap " \
2201 "size; deprecated: to be renamed to MaxRAMFraction") \
2202 range(1, max_uintx) \
2203 \
2204 product(uintx, MinRAMFraction, 2, \
2205 "Minimum fraction (1/n) of real memory used for maximum heap " \
2206 "size on systems with small physical memory size") \
2207 range(1, max_uintx) \
2208 \
2209 product(uintx, InitialRAMFraction, 64, \
2210 "Fraction (1/n) of real memory used for initial heap size") \
2211 range(1, max_uintx) \
2212 \
2213 develop(uintx, MaxVirtMemFraction, 2, \
2214 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2215 "determining maximum heap size") \
2216 \
2217 product(bool, UseAutoGCSelectPolicy, false, \
2218 "Use automatic collection selection policy") \
2219 \
2220 product(uintx, AutoGCSelectPauseMillis, 5000, \
2221 "Automatic GC selection pause threshold in milliseconds") \
2222 \
2223 product(bool, UseAdaptiveSizePolicy, true, \
2224 "Use adaptive generation sizing policies") \
2225 \
2226 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2227 "Use adaptive survivor sizing policies") \
2228 \
2229 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2230 "Use adaptive young-old sizing policies at minor collections") \
2231 \
2232 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2233 "Use adaptive young-old sizing policies at major collections") \
2234 \
2235 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2236 "Include statistics from System.gc() for adaptive size policy") \
2237 \
2238 product(bool, UseAdaptiveGCBoundary, false, \
2239 "Allow young-old boundary to move") \
2240 \
2241 develop(bool, TraceAdaptiveGCBoundary, false, \
2242 "Trace young-old boundary moves") \
2243 \
2244 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2245 "Resize the virtual spaces of the young or old generations") \
2246 range(-1, 1) \
2247 \
2248 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2249 "Policy for changing generation size for throughput goals") \
2250 range(0, 1) \
2251 \
2252 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2253 "Adjust tenured generation to achieve a minor pause goal") \
2254 \
2255 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2256 "Adjust young generation to achieve a major pause goal") \
2257 \
2258 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2259 "Number of steps where heuristics is used before data is used") \
2260 \
2261 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2262 "Number of collections before the adaptive sizing is started") \
2263 \
2264 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2265 "Collection interval for printing information; zero means never") \
2266 \
2267 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2268 "Use adaptive minimum footprint as a goal") \
2269 \
2270 product(uintx, AdaptiveSizePolicyWeight, 10, \
2271 "Weight given to exponential resizing, between 0 and 100") \
2272 range(0, 100) \
2273 \
2274 product(uintx, AdaptiveTimeWeight, 25, \
2275 "Weight given to time in adaptive policy, between 0 and 100") \
2276 range(0, 100) \
2277 \
2278 product(uintx, PausePadding, 1, \
2279 "How much buffer to keep for pause time") \
2280 \
2281 product(uintx, PromotedPadding, 3, \
2282 "How much buffer to keep for promotion failure") \
2283 \
2284 product(uintx, SurvivorPadding, 3, \
2285 "How much buffer to keep for survivor overflow") \
2286 \
2287 product(uintx, ThresholdTolerance, 10, \
2288 "Allowed collection cost difference between generations") \
2289 range(0, 100) \
2290 \
2291 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2292 "If collection costs are within margin, reduce both by full " \
2293 "delta") \
2294 \
2295 product(uintx, YoungGenerationSizeIncrement, 20, \
2296 "Adaptive size percentage change in young generation") \
2297 range(0, 100) \
2298 \
2299 product(uintx, YoungGenerationSizeSupplement, 80, \
2300 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2301 range(0, 100) \
2302 \
2303 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2304 "Decay factor to YoungedGenerationSizeSupplement") \
2305 range(1, max_uintx) \
2306 \
2307 product(uintx, TenuredGenerationSizeIncrement, 20, \
2308 "Adaptive size percentage change in tenured generation") \
2309 range(0, 100) \
2310 \
2311 product(uintx, TenuredGenerationSizeSupplement, 80, \
2312 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2313 range(0, 100) \
2314 \
2315 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2316 "Decay factor to TenuredGenerationSizeIncrement") \
2317 range(1, max_uintx) \
2318 \
2319 product(uintx, MaxGCPauseMillis, max_uintx, \
2320 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2321 "or (G1 Only) the maximum GC time per MMU time slice") \
2322 range(1, max_uintx) \
2323 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2324 \
2325 product(uintx, GCPauseIntervalMillis, 0, \
2326 "Time slice for MMU specification") \
2327 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2328 \
2329 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2330 "Adaptive size policy maximum GC minor pause time goal " \
2331 "in millisecond") \
2332 \
2333 product(uintx, GCTimeRatio, 99, \
2334 "Adaptive size policy application time to GC time ratio") \
2335 \
2336 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2337 "Adaptive size scale down factor for shrinking") \
2338 range(1, max_uintx) \
2339 \
2340 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2341 "Adaptive size decays the major cost for long major intervals") \
2342 \
2343 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2344 "Time scale over which major costs decay") \
2345 \
2346 product(uintx, MinSurvivorRatio, 3, \
2347 "Minimum ratio of young generation/survivor space size") \
2348 range(3, max_uintx) \
2349 \
2350 product(uintx, InitialSurvivorRatio, 8, \
2351 "Initial ratio of young generation/survivor space size") \
2352 \
2353 product(size_t, BaseFootPrintEstimate, 256*M, \
2354 "Estimate of footprint other than Java Heap") \
2355 \
2356 product(bool, UseGCOverheadLimit, true, \
2357 "Use policy to limit of proportion of time spent in GC " \
2358 "before an OutOfMemory error is thrown") \
2359 \
2360 product(uintx, GCTimeLimit, 98, \
2361 "Limit of the proportion of time spent in GC before " \
2362 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2363 range(0, 100) \
2364 \
2365 product(uintx, GCHeapFreeLimit, 2, \
2366 "Minimum percentage of free space after a full GC before an " \
2367 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2368 range(0, 100) \
2369 \
2370 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2371 "Number of consecutive collections before gc time limit fires") \
2372 range(1, max_uintx) \
2373 \
2374 product(bool, PrintAdaptiveSizePolicy, false, \
2375 "Print information about AdaptiveSizePolicy") \
2376 \
2377 product(intx, PrefetchCopyIntervalInBytes, -1, \
2378 "How far ahead to prefetch destination area (<= 0 means off)") \
2379 \
2380 product(intx, PrefetchScanIntervalInBytes, -1, \
2381 "How far ahead to prefetch scan area (<= 0 means off)") \
2382 \
2383 product(intx, PrefetchFieldsAhead, -1, \
2384 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2385 \
2386 diagnostic(bool, VerifySilently, false, \
2387 "Do not print the verification progress") \
2388 \
2389 diagnostic(bool, VerifyDuringStartup, false, \
2390 "Verify memory system before executing any Java code " \
2391 "during VM initialization") \
2392 \
2393 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2394 "Verify system before exiting") \
2395 \
2396 diagnostic(bool, VerifyBeforeGC, false, \
2397 "Verify memory system before GC") \
2398 \
2399 diagnostic(bool, VerifyAfterGC, false, \
2400 "Verify memory system after GC") \
2401 \
2402 diagnostic(bool, VerifyDuringGC, false, \
2403 "Verify memory system during GC (between phases)") \
2404 \
2405 diagnostic(bool, GCParallelVerificationEnabled, true, \
2406 "Enable parallel memory system verification") \
2407 \
2408 diagnostic(bool, DeferInitialCardMark, false, \
2409 "When +ReduceInitialCardMarks, explicitly defer any that " \
2410 "may arise from new_pre_store_barrier") \
2411 \
2412 product(bool, UseCondCardMark, false, \
2413 "Check for already marked card before updating card table") \
2414 \
2415 diagnostic(bool, VerifyRememberedSets, false, \
2416 "Verify GC remembered sets") \
2417 \
2418 diagnostic(bool, VerifyObjectStartArray, true, \
2419 "Verify GC object start array if verify before/after") \
2420 \
2421 product(bool, DisableExplicitGC, false, \
2422 "Ignore calls to System.gc()") \
2423 \
2424 notproduct(bool, CheckMemoryInitialization, false, \
2425 "Check memory initialization") \
2426 \
2427 diagnostic(bool, BindCMSThreadToCPU, false, \
2428 "Bind CMS Thread to CPU if possible") \
2429 \
2430 diagnostic(uintx, CPUForCMSThread, 0, \
2431 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2432 \
2433 product(bool, BindGCTaskThreadsToCPUs, false, \
2434 "Bind GCTaskThreads to CPUs if possible") \
2435 \
2436 product(bool, UseGCTaskAffinity, false, \
2437 "Use worker affinity when asking for GCTasks") \
2438 \
2439 product(uintx, ProcessDistributionStride, 4, \
2440 "Stride through processors when distributing processes") \
2441 \
2442 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2443 "Number of times the coordinator GC thread will sleep while " \
2444 "yielding before giving up and resuming GC") \
2445 \
2446 product(uintx, CMSYieldSleepCount, 0, \
2447 "Number of times a GC thread (minus the coordinator) " \
2448 "will sleep while yielding before giving up and resuming GC") \
2449 \
2450 /* gc tracing */ \
2451 manageable(bool, PrintGC, false, \
2452 "Print message at garbage collection") \
2453 \
2454 manageable(bool, PrintGCDetails, false, \
2455 "Print more details at garbage collection") \
2456 \
2457 manageable(bool, PrintGCDateStamps, false, \
2458 "Print date stamps at garbage collection") \
2459 \
2460 manageable(bool, PrintGCTimeStamps, false, \
2461 "Print timestamps at garbage collection") \
2462 \
2463 manageable(bool, PrintGCID, true, \
2464 "Print an identifier for each garbage collection") \
2465 \
2466 product(bool, PrintGCTaskTimeStamps, false, \
2467 "Print timestamps for individual gc worker thread tasks") \
2468 \
2469 develop(intx, ConcGCYieldTimeout, 0, \
2470 "If non-zero, assert that GC threads yield within this " \
2471 "number of milliseconds") \
2472 range(0, max_intx) \
2473 \
2474 product(bool, PrintReferenceGC, false, \
2475 "Print times spent handling reference objects during GC " \
2476 "(enabled only when PrintGCDetails)") \
2477 \
2478 develop(bool, TraceReferenceGC, false, \
2479 "Trace handling of soft/weak/final/phantom references") \
2480 \
2481 develop(bool, TraceFinalizerRegistration, false, \
2482 "Trace registration of final references") \
2483 \
2484 notproduct(bool, TraceScavenge, false, \
2485 "Trace scavenge") \
2486 \
2487 product(bool, IgnoreEmptyClassPaths, false, \
2488 "Ignore empty path elements in -classpath") \
2489 \
2490 product(bool, TraceClassPaths, false, \
2491 "Trace processing of class paths") \
2492 \
2493 product_rw(bool, TraceClassLoading, false, \
2494 "Trace all classes loaded") \
2495 \
2496 product(bool, TraceClassLoadingPreorder, false, \
2497 "Trace all classes loaded in order referenced (not loaded)") \
2498 \
2499 product_rw(bool, TraceClassUnloading, false, \
2500 "Trace unloading of classes") \
2501 \
2502 product_rw(bool, TraceLoaderConstraints, false, \
2503 "Trace loader constraints") \
2504 \
2505 develop(bool, TraceClassLoaderData, false, \
2506 "Trace class loader loader_data lifetime") \
2507 \
2508 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2509 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2510 "Initial size of the boot class loader data metaspace") \
2511 range(BytesPerWord, max_uintx) \
2512 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2513 \
2514 product(bool, TraceYoungGenTime, false, \
2515 "Trace accumulated time for young collection") \
2516 \
2517 product(bool, TraceOldGenTime, false, \
2518 "Trace accumulated time for old collection") \
2519 \
2520 product(bool, PrintTenuringDistribution, false, \
2521 "Print tenuring age information") \
2522 \
2523 product_rw(bool, PrintHeapAtGC, false, \
2524 "Print heap layout before and after each GC") \
2525 \
2526 product_rw(bool, PrintHeapAtGCExtended, false, \
2527 "Print extended information about the layout of the heap " \
2528 "when -XX:+PrintHeapAtGC is set") \
2529 \
2530 product(bool, PrintHeapAtSIGBREAK, true, \
2531 "Print heap layout in response to SIGBREAK") \
2532 \
2533 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2534 "Print a class histogram before any major stop-world GC") \
2535 \
2536 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2537 "Print a class histogram after any major stop-world GC") \
2538 \
2539 manageable(bool, PrintClassHistogram, false, \
2540 "Print a histogram of class instances") \
2541 \
2542 develop(bool, TraceWorkGang, false, \
2543 "Trace activities of work gangs") \
2544 \
2545 product(bool, TraceParallelOldGCTasks, false, \
2546 "Trace multithreaded GC activity") \
2547 \
2548 develop(bool, TraceBlockOffsetTable, false, \
2549 "Print BlockOffsetTable maps") \
2550 \
2551 develop(bool, TraceCardTableModRefBS, false, \
2552 "Print CardTableModRefBS maps") \
2553 \
2554 develop(bool, TraceGCTaskManager, false, \
2555 "Trace actions of the GC task manager") \
2556 \
2557 develop(bool, TraceGCTaskQueue, false, \
2558 "Trace actions of the GC task queues") \
2559 \
2560 diagnostic(bool, TraceGCTaskThread, false, \
2561 "Trace actions of the GC task threads") \
2562 \
2563 product(bool, PrintParallelOldGCPhaseTimes, false, \
2564 "Print the time taken by each phase in ParallelOldGC " \
2565 "(PrintGCDetails must also be enabled)") \
2566 \
2567 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2568 "Trace marking phase in ParallelOldGC") \
2569 \
2570 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2571 "Trace summary phase in ParallelOldGC") \
2572 \
2573 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2574 "Trace compaction phase in ParallelOldGC") \
2575 \
2576 develop(bool, TraceParallelOldGCDensePrefix, false, \
2577 "Trace dense prefix computation for ParallelOldGC") \
2578 \
2579 develop(bool, IgnoreLibthreadGPFault, false, \
2580 "Suppress workaround for libthread GP fault") \
2581 \
2582 product(bool, PrintJNIGCStalls, false, \
2583 "Print diagnostic message when GC is stalled " \
2584 "by JNI critical section") \
2585 \
2586 experimental(double, ObjectCountCutOffPercent, 0.5, \
2587 "The percentage of the used heap that the instances of a class " \
2588 "must occupy for the class to generate a trace event") \
2589 range(0.0, 100.0) \
2590 \
2591 /* GC log rotation setting */ \
2592 \
2593 product(bool, UseGCLogFileRotation, false, \
2594 "Rotate gclog files (for long running applications). It requires "\
2595 "-Xloggc:<filename>") \
2596 \
2597 product(uintx, NumberOfGCLogFiles, 0, \
2598 "Number of gclog files in rotation " \
2599 "(default: 0, no rotation)") \
2600 \
2601 product(size_t, GCLogFileSize, 8*K, \
2602 "GC log file size, requires UseGCLogFileRotation. " \
2603 "Set to 0 to only trigger rotation via jcmd") \
2604 \
2605 /* JVMTI heap profiling */ \
2606 \
2607 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2608 "Trace JVMTI object tagging calls") \
2609 \
2610 diagnostic(bool, VerifyBeforeIteration, false, \
2611 "Verify memory system before JVMTI iteration") \
2612 \
2613 /* compiler interface */ \
2614 \
2615 develop(bool, CIPrintCompilerName, false, \
2616 "when CIPrint is active, print the name of the active compiler") \
2617 \
2618 diagnostic(bool, CIPrintCompileQueue, false, \
2619 "display the contents of the compile queue whenever a " \
2620 "compilation is enqueued") \
2621 \
2622 develop(bool, CIPrintRequests, false, \
2623 "display every request for compilation") \
2624 \
2625 product(bool, CITime, false, \
2626 "collect timing information for compilation") \
2627 \
2628 develop(bool, CITimeVerbose, false, \
2629 "be more verbose in compilation timings") \
2630 \
2631 develop(bool, CITimeEach, false, \
2632 "display timing information after each successful compilation") \
2633 \
2634 develop(bool, CICountOSR, false, \
2635 "use a separate counter when assigning ids to osr compilations") \
2636 \
2637 develop(bool, CICompileNatives, true, \
2638 "compile native methods if supported by the compiler") \
2639 \
2640 develop_pd(bool, CICompileOSR, \
2641 "compile on stack replacement methods if supported by the " \
2642 "compiler") \
2643 \
2644 develop(bool, CIPrintMethodCodes, false, \
2645 "print method bytecodes of the compiled code") \
2646 \
2647 develop(bool, CIPrintTypeFlow, false, \
2648 "print the results of ciTypeFlow analysis") \
2649 \
2650 develop(bool, CITraceTypeFlow, false, \
2651 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2652 \
2653 develop(intx, OSROnlyBCI, -1, \
2654 "OSR only at this bci. Negative values mean exclude that bci") \
2655 \
2656 /* compiler */ \
2657 \
2658 /* notice: the max range value here is max_jint, not max_intx */ \
2659 /* because of overflow issue */ \
2660 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2661 "Number of compiler threads to run") \
2662 range(0, max_jint) \
2663 constraint(CICompilerCountConstraintFunc, AtParse) \
2664 \
2665 product(intx, CompilationPolicyChoice, 0, \
2666 "which compilation policy (0-3)") \
2667 range(0, 3) \
2668 \
2669 develop(bool, UseStackBanging, true, \
2670 "use stack banging for stack overflow checks (required for " \
2671 "proper StackOverflow handling; disable only to measure cost " \
2672 "of stackbanging)") \
2673 \
2674 develop(bool, UseStrictFP, true, \
2675 "use strict fp if modifier strictfp is set") \
2676 \
2677 develop(bool, GenerateSynchronizationCode, true, \
2678 "generate locking/unlocking code for synchronized methods and " \
2679 "monitors") \
2680 \
2681 develop(bool, GenerateCompilerNullChecks, true, \
2682 "Generate explicit null checks for loads/stores/calls") \
2683 \
2684 develop(bool, GenerateRangeChecks, true, \
2685 "Generate range checks for array accesses") \
2686 \
2687 develop_pd(bool, ImplicitNullChecks, \
2688 "Generate code for implicit null checks") \
2689 \
2690 product_pd(bool, TrapBasedNullChecks, \
2691 "Generate code for null checks that uses a cmp and trap " \
2692 "instruction raising SIGTRAP. This is only used if an access to" \
2693 "null (+offset) will not raise a SIGSEGV, i.e.," \
2694 "ImplicitNullChecks don't work (PPC64).") \
2695 \
2696 product(bool, PrintSafepointStatistics, false, \
2697 "Print statistics about safepoint synchronization") \
2698 \
2699 product(intx, PrintSafepointStatisticsCount, 300, \
2700 "Total number of safepoint statistics collected " \
2701 "before printing them out") \
2702 \
2703 product(intx, PrintSafepointStatisticsTimeout, -1, \
2704 "Print safepoint statistics only when safepoint takes " \
2705 "more than PrintSafepointSatisticsTimeout in millis") \
2706 \
2707 product(bool, TraceSafepointCleanupTime, false, \
2708 "Print the break down of clean up tasks performed during " \
2709 "safepoint") \
2710 \
2711 product(bool, Inline, true, \
2712 "Enable inlining") \
2713 \
2714 product(bool, ClipInlining, true, \
2715 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2716 \
2717 develop(bool, UseCHA, true, \
2718 "Enable CHA") \
2719 \
2720 product(bool, UseTypeProfile, true, \
2721 "Check interpreter profile for historically monomorphic calls") \
2722 \
2723 diagnostic(bool, PrintInlining, false, \
2724 "Print inlining optimizations") \
2725 \
2726 product(bool, UsePopCountInstruction, false, \
2727 "Use population count instruction") \
2728 \
2729 develop(bool, EagerInitialization, false, \
2730 "Eagerly initialize classes if possible") \
2731 \
2732 diagnostic(bool, LogTouchedMethods, false, \
2733 "Log methods which have been ever touched in runtime") \
2734 \
2735 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2736 "Print all methods that have been ever touched in runtime") \
2737 \
2738 develop(bool, TraceMethodReplacement, false, \
2739 "Print when methods are replaced do to recompilation") \
2740 \
2741 develop(bool, PrintMethodFlushing, false, \
2742 "Print the nmethods being flushed") \
2743 \
2744 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2745 "print statistics about method flushing") \
2746 \
2747 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2748 "Number of compiled code invocations after which " \
2749 "the method is considered as hot by the flusher") \
2750 \
2751 diagnostic(intx, MinPassesBeforeFlush, 10, \
2752 "Minimum number of sweeper passes before an nmethod " \
2753 "can be flushed") \
2754 \
2755 product(bool, UseCodeAging, true, \
2756 "Insert counter to detect warm methods") \
2757 \
2758 diagnostic(bool, StressCodeAging, false, \
2759 "Start with counters compiled in") \
2760 \
2761 develop(bool, UseRelocIndex, false, \
2762 "Use an index to speed random access to relocations") \
2763 \
2764 develop(bool, StressCodeBuffers, false, \
2765 "Exercise code buffer expansion and other rare state changes") \
2766 \
2767 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2768 "Generate extra debugging information for non-safepoints in " \
2769 "nmethods") \
2770 \
2771 product(bool, PrintVMOptions, false, \
2772 "Print flags that appeared on the command line") \
2773 \
2774 product(bool, IgnoreUnrecognizedVMOptions, false, \
2775 "Ignore unrecognized VM options") \
2776 \
2777 product(bool, PrintCommandLineFlags, false, \
2778 "Print flags specified on command line or set by ergonomics") \
2779 \
2780 product(bool, PrintFlagsInitial, false, \
2781 "Print all VM flags before argument processing and exit VM") \
2782 \
2783 product(bool, PrintFlagsFinal, false, \
2784 "Print all VM flags after argument and ergonomic processing") \
2785 \
2786 notproduct(bool, PrintFlagsWithComments, false, \
2787 "Print all VM flags with default values and descriptions and " \
2788 "exit") \
2789 \
2790 product(bool, PrintFlagsRanges, false, \
2791 "Print VM flags and their ranges and exit VM") \
2792 \
2793 diagnostic(bool, SerializeVMOutput, true, \
2794 "Use a mutex to serialize output to tty and LogFile") \
2795 \
2796 diagnostic(bool, DisplayVMOutput, true, \
2797 "Display all VM output on the tty, independently of LogVMOutput") \
2798 \
2799 diagnostic(bool, LogVMOutput, false, \
2800 "Save VM output to LogFile") \
2801 \
2802 diagnostic(ccstr, LogFile, NULL, \
2803 "If LogVMOutput or LogCompilation is on, save VM output to " \
2804 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2805 \
2806 product(ccstr, ErrorFile, NULL, \
2807 "If an error occurs, save the error data to this file " \
2808 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2809 \
2810 product(bool, DisplayVMOutputToStderr, false, \
2811 "If DisplayVMOutput is true, display all VM output to stderr") \
2812 \
2813 product(bool, DisplayVMOutputToStdout, false, \
2814 "If DisplayVMOutput is true, display all VM output to stdout") \
2815 \
2816 product(bool, UseHeavyMonitors, false, \
2817 "use heavyweight instead of lightweight Java monitors") \
2818 \
2819 product(bool, PrintStringTableStatistics, false, \
2820 "print statistics about the StringTable and SymbolTable") \
2821 \
2822 diagnostic(bool, VerifyStringTableAtExit, false, \
2823 "verify StringTable contents at exit") \
2824 \
2825 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2826 "print histogram of the symbol table") \
2827 \
2828 notproduct(bool, ExitVMOnVerifyError, false, \
2829 "standard exit from VM if bytecode verify error " \
2830 "(only in debug mode)") \
2831 \
2832 notproduct(ccstr, AbortVMOnException, NULL, \
2833 "Call fatal if this exception is thrown. Example: " \
2834 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2835 \
2836 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2837 "Call fatal if the exception pointed by AbortVMOnException " \
2838 "has this message") \
2839 \
2840 develop(bool, DebugVtables, false, \
2841 "add debugging code to vtable dispatch") \
2842 \
2843 develop(bool, PrintVtables, false, \
2844 "print vtables when printing klass") \
2845 \
2846 notproduct(bool, PrintVtableStats, false, \
2847 "print vtables stats at end of run") \
2848 \
2849 develop(bool, TraceCreateZombies, false, \
2850 "trace creation of zombie nmethods") \
2851 \
2852 notproduct(bool, IgnoreLockingAssertions, false, \
2853 "disable locking assertions (for speed)") \
2854 \
2855 product(bool, RangeCheckElimination, true, \
2856 "Eliminate range checks") \
2857 \
2858 develop_pd(bool, UncommonNullCast, \
2859 "track occurrences of null in casts; adjust compiler tactics") \
2860 \
2861 develop(bool, TypeProfileCasts, true, \
2862 "treat casts like calls for purposes of type profiling") \
2863 \
2864 develop(bool, DelayCompilationDuringStartup, true, \
2865 "Delay invoking the compiler until main application class is " \
2866 "loaded") \
2867 \
2868 develop(bool, CompileTheWorld, false, \
2869 "Compile all methods in all classes in bootstrap class path " \
2870 "(stress test)") \
2871 \
2872 develop(bool, CompileTheWorldPreloadClasses, true, \
2873 "Preload all classes used by a class before start loading") \
2874 \
2875 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2876 "Force a safepoint every n compiles so sweeper can keep up") \
2877 \
2878 develop(bool, FillDelaySlots, true, \
2879 "Fill delay slots (on SPARC only)") \
2880 \
2881 develop(bool, TimeLivenessAnalysis, false, \
2882 "Time computation of bytecode liveness analysis") \
2883 \
2884 develop(bool, TraceLivenessGen, false, \
2885 "Trace the generation of liveness analysis information") \
2886 \
2887 notproduct(bool, TraceLivenessQuery, false, \
2888 "Trace queries of liveness analysis information") \
2889 \
2890 notproduct(bool, CollectIndexSetStatistics, false, \
2891 "Collect information about IndexSets") \
2892 \
2893 develop(bool, UseLoopSafepoints, true, \
2894 "Generate Safepoint nodes in every loop") \
2895 \
2896 develop(intx, FastAllocateSizeLimit, 128*K, \
2897 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2898 "Inline allocations larger than this in doublewords must go slow")\
2899 \
2900 product(bool, AggressiveOpts, false, \
2901 "Enable aggressive optimizations - see arguments.cpp") \
2902 \
2903 product_pd(uintx, TypeProfileLevel, \
2904 "=XYZ, with Z: Type profiling of arguments at call; " \
2905 "Y: Type profiling of return value at call; " \
2906 "X: Type profiling of parameters to methods; " \
2907 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2908 \
2909 product(intx, TypeProfileArgsLimit, 2, \
2910 "max number of call arguments to consider for type profiling") \
2911 \
2912 product(intx, TypeProfileParmsLimit, 2, \
2913 "max number of incoming parameters to consider for type profiling"\
2914 ", -1 for all") \
2915 \
2916 /* statistics */ \
2917 develop(bool, CountCompiledCalls, false, \
2918 "Count method invocations") \
2919 \
2920 notproduct(bool, CountRuntimeCalls, false, \
2921 "Count VM runtime calls") \
2922 \
2923 develop(bool, CountJNICalls, false, \
2924 "Count jni method invocations") \
2925 \
2926 notproduct(bool, CountJVMCalls, false, \
2927 "Count jvm method invocations") \
2928 \
2929 notproduct(bool, CountRemovableExceptions, false, \
2930 "Count exceptions that could be replaced by branches due to " \
2931 "inlining") \
2932 \
2933 notproduct(bool, ICMissHistogram, false, \
2934 "Produce histogram of IC misses") \
2935 \
2936 /* interpreter */ \
2937 develop(bool, ClearInterpreterLocals, false, \
2938 "Always clear local variables of interpreter activations upon " \
2939 "entry") \
2940 \
2941 product_pd(bool, RewriteBytecodes, \
2942 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2943 \
2944 product_pd(bool, RewriteFrequentPairs, \
2945 "Rewrite frequently used bytecode pairs into a single bytecode") \
2946 \
2947 diagnostic(bool, PrintInterpreter, false, \
2948 "Print the generated interpreter code") \
2949 \
2950 product(bool, UseInterpreter, true, \
2951 "Use interpreter for non-compiled methods") \
2952 \
2953 develop(bool, UseFastSignatureHandlers, true, \
2954 "Use fast signature handlers for native calls") \
2955 \
2956 product(bool, UseLoopCounter, true, \
2957 "Increment invocation counter on backward branch") \
2958 \
2959 product_pd(bool, UseOnStackReplacement, \
2960 "Use on stack replacement, calls runtime if invoc. counter " \
2961 "overflows in loop") \
2962 \
2963 notproduct(bool, TraceOnStackReplacement, false, \
2964 "Trace on stack replacement") \
2965 \
2966 product_pd(bool, PreferInterpreterNativeStubs, \
2967 "Use always interpreter stubs for native methods invoked via " \
2968 "interpreter") \
2969 \
2970 develop(bool, CountBytecodes, false, \
2971 "Count number of bytecodes executed") \
2972 \
2973 develop(bool, PrintBytecodeHistogram, false, \
2974 "Print histogram of the executed bytecodes") \
2975 \
2976 develop(bool, PrintBytecodePairHistogram, false, \
2977 "Print histogram of the executed bytecode pairs") \
2978 \
2979 diagnostic(bool, PrintSignatureHandlers, false, \
2980 "Print code generated for native method signature handlers") \
2981 \
2982 develop(bool, VerifyOops, false, \
2983 "Do plausibility checks for oops") \
2984 \
2985 develop(bool, CheckUnhandledOops, false, \
2986 "Check for unhandled oops in VM code") \
2987 \
2988 develop(bool, VerifyJNIFields, trueInDebug, \
2989 "Verify jfieldIDs for instance fields") \
2990 \
2991 notproduct(bool, VerifyJNIEnvThread, false, \
2992 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2993 "from JNI") \
2994 \
2995 develop(bool, VerifyFPU, false, \
2996 "Verify FPU state (check for NaN's, etc.)") \
2997 \
2998 develop(bool, VerifyThread, false, \
2999 "Watch the thread register for corruption (SPARC only)") \
3000 \
3001 develop(bool, VerifyActivationFrameSize, false, \
3002 "Verify that activation frame didn't become smaller than its " \
3003 "minimal size") \
3004 \
3005 develop(bool, TraceFrequencyInlining, false, \
3006 "Trace frequency based inlining") \
3007 \
3008 develop_pd(bool, InlineIntrinsics, \
3009 "Inline intrinsics that can be statically resolved") \
3010 \
3011 product_pd(bool, ProfileInterpreter, \
3012 "Profile at the bytecode level during interpretation") \
3013 \
3014 develop(bool, TraceProfileInterpreter, false, \
3015 "Trace profiling at the bytecode level during interpretation. " \
3016 "This outputs the profiling information collected to improve " \
3017 "jit compilation.") \
3018 \
3019 develop_pd(bool, ProfileTraps, \
3020 "Profile deoptimization traps at the bytecode level") \
3021 \
3022 product(intx, ProfileMaturityPercentage, 20, \
3023 "number of method invocations/branches (expressed as % of " \
3024 "CompileThreshold) before using the method's profile") \
3025 range(0, 100) \
3026 \
3027 diagnostic(bool, PrintMethodData, false, \
3028 "Print the results of +ProfileInterpreter at end of run") \
3029 \
3030 develop(bool, VerifyDataPointer, trueInDebug, \
3031 "Verify the method data pointer during interpreter profiling") \
3032 \
3033 develop(bool, VerifyCompiledCode, false, \
3034 "Include miscellaneous runtime verifications in nmethod code; " \
3035 "default off because it disturbs nmethod size heuristics") \
3036 \
3037 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3038 "Manually make GC thread crash then dump java stack trace; " \
3039 "Test only") \
3040 \
3041 /* compilation */ \
3042 product(bool, UseCompiler, true, \
3043 "Use Just-In-Time compilation") \
3044 \
3045 develop(bool, TraceCompilationPolicy, false, \
3046 "Trace compilation policy") \
3047 \
3048 develop(bool, TimeCompilationPolicy, false, \
3049 "Time the compilation policy") \
3050 \
3051 product(bool, UseCounterDecay, true, \
3052 "Adjust recompilation counters") \
3053 \
3054 develop(intx, CounterHalfLifeTime, 30, \
3055 "Half-life time of invocation counters (in seconds)") \
3056 \
3057 develop(intx, CounterDecayMinIntervalLength, 500, \
3058 "The minimum interval (in milliseconds) between invocation of " \
3059 "CounterDecay") \
3060 \
3061 product(bool, AlwaysCompileLoopMethods, false, \
3062 "When using recompilation, never interpret methods " \
3063 "containing loops") \
3064 \
3065 product(bool, DontCompileHugeMethods, true, \
3066 "Do not compile methods > HugeMethodLimit") \
3067 \
3068 /* Bytecode escape analysis estimation. */ \
3069 product(bool, EstimateArgEscape, true, \
3070 "Analyze bytecodes to estimate escape state of arguments") \
3071 \
3072 product(intx, BCEATraceLevel, 0, \
3073 "How much tracing to do of bytecode escape analysis estimates") \
3074 \
3075 product(intx, MaxBCEAEstimateLevel, 5, \
3076 "Maximum number of nested calls that are analyzed by BC EA") \
3077 \
3078 product(intx, MaxBCEAEstimateSize, 150, \
3079 "Maximum bytecode size of a method to be analyzed by BC EA") \
3080 \
3081 product(intx, AllocatePrefetchStyle, 1, \
3082 "0 = no prefetch, " \
3083 "1 = prefetch instructions for each allocation, " \
3084 "2 = use TLAB watermark to gate allocation prefetch, " \
3085 "3 = use BIS instruction on Sparc for allocation prefetch") \
3086 range(0, 3) \
3087 \
3088 product(intx, AllocatePrefetchDistance, -1, \
3089 "Distance to prefetch ahead of allocation pointer") \
3090 \
3091 product(intx, AllocatePrefetchLines, 3, \
3092 "Number of lines to prefetch ahead of array allocation pointer") \
3093 \
3094 product(intx, AllocateInstancePrefetchLines, 1, \
3095 "Number of lines to prefetch ahead of instance allocation " \
3096 "pointer") \
3097 \
3098 product(intx, AllocatePrefetchStepSize, 16, \
3099 "Step size in bytes of sequential prefetch instructions") \
3100 \
3101 product(intx, AllocatePrefetchInstr, 0, \
3102 "Prefetch instruction to prefetch ahead of allocation pointer") \
3103 \
3104 /* deoptimization */ \
3105 develop(bool, TraceDeoptimization, false, \
3106 "Trace deoptimization") \
3107 \
3108 develop(bool, DebugDeoptimization, false, \
3109 "Tracing various information while debugging deoptimization") \
3110 \
3111 product(intx, SelfDestructTimer, 0, \
3112 "Will cause VM to terminate after a given time (in minutes) " \
3113 "(0 means off)") \
3114 \
3115 product(intx, MaxJavaStackTraceDepth, 1024, \
3116 "The maximum number of lines in the stack trace for Java " \
3117 "exceptions (0 means all)") \
3118 \
3119 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3120 "Guarantee a safepoint (at least) every so many milliseconds " \
3121 "(0 means none)")) \
3122 \
3123 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3124 "Guarantee a safepoint (at least) every so many milliseconds " \
3125 "(0 means none)")) \
3126 \
3127 product(intx, SafepointTimeoutDelay, 10000, \
3128 "Delay in milliseconds for option SafepointTimeout") \
3129 \
3130 product(intx, NmethodSweepActivity, 10, \
3131 "Removes cold nmethods from code cache if > 0. Higher values " \
3132 "result in more aggressive sweeping") \
3133 range(0, 2000) \
3134 \
3135 notproduct(bool, LogSweeper, false, \
3136 "Keep a ring buffer of sweeper activity") \
3137 \
3138 notproduct(intx, SweeperLogEntries, 1024, \
3139 "Number of records in the ring buffer of sweeper activity") \
3140 \
3141 notproduct(intx, MemProfilingInterval, 500, \
3142 "Time between each invocation of the MemProfiler") \
3143 \
3144 develop(intx, MallocCatchPtr, -1, \
3145 "Hit breakpoint when mallocing/freeing this pointer") \
3146 \
3147 notproduct(ccstrlist, SuppressErrorAt, "", \
3148 "List of assertions (file:line) to muzzle") \
3149 \
3150 notproduct(size_t, HandleAllocationLimit, 1024, \
3151 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3152 "is used") \
3153 \
3154 develop(size_t, TotalHandleAllocationLimit, 1024, \
3155 "Threshold for total handle allocation when " \
3156 "+TraceHandleAllocation is used") \
3157 \
3158 develop(intx, StackPrintLimit, 100, \
3159 "number of stack frames to print in VM-level stack dump") \
3160 \
3161 notproduct(intx, MaxElementPrintSize, 256, \
3162 "maximum number of elements to print") \
3163 \
3164 notproduct(intx, MaxSubklassPrintSize, 4, \
3165 "maximum number of subklasses to print when printing klass") \
3166 \
3167 product(intx, MaxInlineLevel, 9, \
3168 "maximum number of nested calls that are inlined") \
3169 \
3170 product(intx, MaxRecursiveInlineLevel, 1, \
3171 "maximum number of nested recursive calls that are inlined") \
3172 \
3173 develop(intx, MaxForceInlineLevel, 100, \
3174 "maximum number of nested calls that are forced for inlining " \
3175 "(using CompilerOracle or marked w/ @ForceInline)") \
3176 \
3177 product_pd(intx, InlineSmallCode, \
3178 "Only inline already compiled methods if their code size is " \
3179 "less than this") \
3180 \
3181 product(intx, MaxInlineSize, 35, \
3182 "The maximum bytecode size of a method to be inlined") \
3183 \
3184 product_pd(intx, FreqInlineSize, \
3185 "The maximum bytecode size of a frequent method to be inlined") \
3186 \
3187 product(intx, MaxTrivialSize, 6, \
3188 "The maximum bytecode size of a trivial method to be inlined") \
3189 \
3190 product(intx, MinInliningThreshold, 250, \
3191 "The minimum invocation count a method needs to have to be " \
3192 "inlined") \
3193 \
3194 develop(intx, MethodHistogramCutoff, 100, \
3195 "The cutoff value for method invocation histogram (+CountCalls)") \
3196 \
3197 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3198 "Number of interpreted methods to show in profile") \
3199 \
3200 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3201 "Number of compiled methods to show in profile") \
3202 \
3203 develop(intx, ProfilerNumberOfStubMethods, 25, \
3204 "Number of stub methods to show in profile") \
3205 \
3206 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3207 "Number of runtime stub nodes to show in profile") \
3208 \
3209 product(intx, ProfileIntervalsTicks, 100, \
3210 "Number of ticks between printing of interval profile " \
3211 "(+ProfileIntervals)") \
3212 \
3213 notproduct(intx, ScavengeALotInterval, 1, \
3214 "Interval between which scavenge will occur with +ScavengeALot") \
3215 \
3216 notproduct(intx, FullGCALotInterval, 1, \
3217 "Interval between which full gc will occur with +FullGCALot") \
3218 \
3219 notproduct(intx, FullGCALotStart, 0, \
3220 "For which invocation to start FullGCAlot") \
3221 \
3222 notproduct(intx, FullGCALotDummies, 32*K, \
3223 "Dummy object allocated with +FullGCALot, forcing all objects " \
3224 "to move") \
3225 \
3226 develop(intx, DontYieldALotInterval, 10, \
3227 "Interval between which yields will be dropped (milliseconds)") \
3228 \
3229 develop(intx, MinSleepInterval, 1, \
3230 "Minimum sleep() interval (milliseconds) when " \
3231 "ConvertSleepToYield is off (used for Solaris)") \
3232 \
3233 develop(intx, ProfilerPCTickThreshold, 15, \
3234 "Number of ticks in a PC buckets to be a hotspot") \
3235 \
3236 notproduct(intx, DeoptimizeALotInterval, 5, \
3237 "Number of exits until DeoptimizeALot kicks in") \
3238 \
3239 notproduct(intx, ZombieALotInterval, 5, \
3240 "Number of exits until ZombieALot kicks in") \
3241 \
3242 diagnostic(intx, MallocVerifyInterval, 0, \
3243 "If non-zero, verify C heap after every N calls to " \
3244 "malloc/realloc/free") \
3245 \
3246 diagnostic(intx, MallocVerifyStart, 0, \
3247 "If non-zero, start verifying C heap after Nth call to " \
3248 "malloc/realloc/free") \
3249 \
3250 diagnostic(uintx, MallocMaxTestWords, 0, \
3251 "If non-zero, maximum number of words that malloc/realloc can " \
3252 "allocate (for testing only)") \
3253 \
3254 product(intx, TypeProfileWidth, 2, \
3255 "Number of receiver types to record in call/cast profile") \
3256 \
3257 develop(intx, BciProfileWidth, 2, \
3258 "Number of return bci's to record in ret profile") \
3259 \
3260 product(intx, PerMethodRecompilationCutoff, 400, \
3261 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3262 range(-1, max_intx) \
3263 \
3264 product(intx, PerBytecodeRecompilationCutoff, 200, \
3265 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3266 range(-1, max_intx) \
3267 \
3268 product(intx, PerMethodTrapLimit, 100, \
3269 "Limit on traps (of one kind) in a method (includes inlines)") \
3270 \
3271 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3272 "Limit on speculative traps (of one kind) in a method " \
3273 "(includes inlines)") \
3274 \
3275 product(intx, PerBytecodeTrapLimit, 4, \
3276 "Limit on traps (of one kind) at a particular BCI") \
3277 \
3278 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3279 "Extra method data trap entries for speculation") \
3280 \
3281 develop(intx, InlineFrequencyRatio, 20, \
3282 "Ratio of call site execution to caller method invocation") \
3283 \
3284 develop_pd(intx, InlineFrequencyCount, \
3285 "Count of call site execution necessary to trigger frequent " \
3286 "inlining") \
3287 \
3288 develop(intx, InlineThrowCount, 50, \
3289 "Force inlining of interpreted methods that throw this often") \
3290 \
3291 develop(intx, InlineThrowMaxSize, 200, \
3292 "Force inlining of throwing methods smaller than this") \
3293 \
3294 develop(intx, ProfilerNodeSize, 1024, \
3295 "Size in K to allocate for the Profile Nodes of each thread") \
3296 \
3297 /* gc parameters */ \
3298 product(size_t, InitialHeapSize, 0, \
3299 "Initial heap size (in bytes); zero means use ergonomics") \
3300 range(0, max_uintx) \
3301 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3302 \
3303 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3304 "Maximum heap size (in bytes)") \
3305 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3306 \
3307 product(size_t, OldSize, ScaleForWordSize(4*M), \
3308 "Initial tenured generation size (in bytes)") \
3309 \
3310 product(size_t, NewSize, ScaleForWordSize(1*M), \
3311 "Initial new generation size (in bytes)") \
3312 constraint(NewSizeConstraintFunc,AfterErgo) \
3313 \
3314 product(size_t, MaxNewSize, max_uintx, \
3315 "Maximum new generation size (in bytes), max_uintx means set " \
3316 "ergonomically") \
3317 \
3318 product(size_t, PretenureSizeThreshold, 0, \
3319 "Maximum size in bytes of objects allocated in DefNew " \
3320 "generation; zero means no maximum") \
3321 \
3322 product(size_t, MinTLABSize, 2*K, \
3323 "Minimum allowed TLAB size (in bytes)") \
3324 range(1, max_uintx) \
3325 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3326 \
3327 product(size_t, TLABSize, 0, \
3328 "Starting TLAB size (in bytes); zero means set ergonomically") \
3329 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3330 \
3331 product(size_t, YoungPLABSize, 4096, \
3332 "Size of young gen promotion LAB's (in HeapWords)") \
3333 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3334 \
3335 product(size_t, OldPLABSize, 1024, \
3336 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3337 "of blocks to attempt to claim when refilling CMS LAB's") \
3338 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3339 \
3340 product(uintx, TLABAllocationWeight, 35, \
3341 "Allocation averaging weight") \
3342 range(0, 100) \
3343 \
3344 /* Limit the lower bound of this flag to 1 as it is used */ \
3345 /* in a division expression. */ \
3346 product(uintx, TLABWasteTargetPercent, 1, \
3347 "Percentage of Eden that can be wasted") \
3348 range(1, 100) \
3349 \
3350 product(uintx, TLABRefillWasteFraction, 64, \
3351 "Maximum TLAB waste at a refill (internal fragmentation)") \
3352 range(1, max_uintx) \
3353 \
3354 product(uintx, TLABWasteIncrement, 4, \
3355 "Increment allowed waste at slow allocation") \
3356 \
3357 product(uintx, SurvivorRatio, 8, \
3358 "Ratio of eden/survivor space size") \
3359 range(1, max_uintx-2) \
3360 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3361 \
3362 product(uintx, NewRatio, 2, \
3363 "Ratio of old/new generation sizes") \
3364 range(0, max_uintx-1) \
3365 \
3366 product_pd(size_t, NewSizeThreadIncrease, \
3367 "Additional size added to desired new generation size per " \
3368 "non-daemon thread (in bytes)") \
3369 \
3370 product_pd(size_t, MetaspaceSize, \
3371 "Initial size of Metaspaces (in bytes)") \
3372 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3373 \
3374 product(size_t, MaxMetaspaceSize, max_uintx, \
3375 "Maximum size of Metaspaces (in bytes)") \
3376 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3377 \
3378 product(size_t, CompressedClassSpaceSize, 1*G, \
3379 "Maximum size of class area in Metaspace when compressed " \
3380 "class pointers are used") \
3381 range(1*M, 3*G) \
3382 \
3383 manageable(uintx, MinHeapFreeRatio, 40, \
3384 "The minimum percentage of heap free after GC to avoid expansion."\
3385 " For most GCs this applies to the old generation. In G1 and" \
3386 " ParallelGC it applies to the whole heap.") \
3387 range(0, 100) \
3388 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3389 \
3390 manageable(uintx, MaxHeapFreeRatio, 70, \
3391 "The maximum percentage of heap free after GC to avoid shrinking."\
3392 " For most GCs this applies to the old generation. In G1 and" \
3393 " ParallelGC it applies to the whole heap.") \
3394 range(0, 100) \
3395 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3396 \
3397 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3398 "Number of milliseconds per MB of free space in the heap") \
3399 range(0, max_intx) \
3400 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3401 \
3402 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3403 "The minimum change in heap space due to GC (in bytes)") \
3404 \
3405 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3406 "The minimum expansion of Metaspace (in bytes)") \
3407 \
3408 product(uintx, MaxMetaspaceFreeRatio, 70, \
3409 "The maximum percentage of Metaspace free after GC to avoid " \
3410 "shrinking") \
3411 range(0, 100) \
3412 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3413 \
3414 product(uintx, MinMetaspaceFreeRatio, 40, \
3415 "The minimum percentage of Metaspace free after GC to avoid " \
3416 "expansion") \
3417 range(0, 99) \
3418 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3419 \
3420 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3421 "The maximum expansion of Metaspace without full GC (in bytes)") \
3422 \
3423 product(uintx, QueuedAllocationWarningCount, 0, \
3424 "Number of times an allocation that queues behind a GC " \
3425 "will retry before printing a warning") \
3426 \
3427 diagnostic(uintx, VerifyGCStartAt, 0, \
3428 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3429 \
3430 diagnostic(intx, VerifyGCLevel, 0, \
3431 "Generation level at which to start +VerifyBefore/AfterGC") \
3432 range(0, 1) \
3433 \
3434 product(uintx, MaxTenuringThreshold, 15, \
3435 "Maximum value for tenuring threshold") \
3436 range(0, markOopDesc::max_age + 1) \
3437 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3438 \
3439 product(uintx, InitialTenuringThreshold, 7, \
3440 "Initial value for tenuring threshold") \
3441 range(0, markOopDesc::max_age + 1) \
3442 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3443 \
3444 product(uintx, TargetSurvivorRatio, 50, \
3445 "Desired percentage of survivor space used after scavenge") \
3446 range(0, 100) \
3447 \
3448 product(uintx, MarkSweepDeadRatio, 5, \
3449 "Percentage (0-100) of the old gen allowed as dead wood. " \
3450 "Serial mark sweep treats this as both the minimum and maximum " \
3451 "value. " \
3452 "CMS uses this value only if it falls back to mark sweep. " \
3453 "Par compact uses a variable scale based on the density of the " \
3454 "generation and treats this as the maximum value when the heap " \
3455 "is either completely full or completely empty. Par compact " \
3456 "also has a smaller default value; see arguments.cpp.") \
3457 range(0, 100) \
3458 \
3459 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3460 "How often should we fully compact the heap (ignoring the dead " \
3461 "space parameters)") \
3462 range(1, max_uintx) \
3463 \
3464 product(intx, PrintCMSStatistics, 0, \
3465 "Statistics for CMS") \
3466 \
3467 product(bool, PrintCMSInitiationStatistics, false, \
3468 "Statistics for initiating a CMS collection") \
3469 \
3470 product(intx, PrintFLSStatistics, 0, \
3471 "Statistics for CMS' FreeListSpace") \
3472 \
3473 product(intx, PrintFLSCensus, 0, \
3474 "Census for CMS' FreeListSpace") \
3475 \
3476 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3477 "Delay between expansion and allocation (in milliseconds)") \
3478 \
3479 develop(uintx, GCWorkerDelayMillis, 0, \
3480 "Delay in scheduling GC workers (in milliseconds)") \
3481 \
3482 product(intx, DeferThrSuspendLoopCount, 4000, \
3483 "(Unstable) Number of times to iterate in safepoint loop " \
3484 "before blocking VM threads ") \
3485 \
3486 product(intx, DeferPollingPageLoopCount, -1, \
3487 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3488 "before changing safepoint polling page to RO ") \
3489 \
3490 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3491 range(0, max_intx) \
3492 \
3493 product(bool, PSChunkLargeArrays, true, \
3494 "Process large arrays in chunks") \
3495 \
3496 product(uintx, GCDrainStackTargetSize, 64, \
3497 "Number of entries we will try to leave on the stack " \
3498 "during parallel gc") \
3499 \
3500 /* stack parameters */ \
3501 product_pd(intx, StackYellowPages, \
3502 "Number of yellow zone (recoverable overflows) pages") \
3503 range(1, max_intx) \
3504 \
3505 product_pd(intx, StackRedPages, \
3506 "Number of red zone (unrecoverable overflows) pages") \
3507 range(1, max_intx) \
3508 \
3509 /* greater stack shadow pages can't generate instruction to bang stack */ \
3510 product_pd(intx, StackShadowPages, \
3511 "Number of shadow zone (for overflow checking) pages " \
3512 "this should exceed the depth of the VM and native call stack") \
3513 range(1, 50) \
3514 \
3515 product_pd(intx, ThreadStackSize, \
3516 "Thread Stack Size (in Kbytes)") \
3517 \
3518 product_pd(intx, VMThreadStackSize, \
3519 "Non-Java Thread Stack Size (in Kbytes)") \
3520 \
3521 product_pd(intx, CompilerThreadStackSize, \
3522 "Compiler Thread Stack Size (in Kbytes)") \
3523 \
3524 develop_pd(size_t, JVMInvokeMethodSlack, \
3525 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3526 \
3527 /* code cache parameters */ \
3528 /* ppc64/tiered compilation has large code-entry alignment. */ \
3529 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3530 "Code cache segment size (in bytes) - smallest unit of " \
3531 "allocation") \
3532 range(1, 1024) \
3533 \
3534 develop_pd(intx, CodeEntryAlignment, \
3535 "Code entry alignment for generated code (in bytes)") \
3536 \
3537 product_pd(intx, OptoLoopAlignment, \
3538 "Align inner loops to zero relative to this modulus") \
3539 \
3540 product_pd(uintx, InitialCodeCacheSize, \
3541 "Initial code cache size (in bytes)") \
3542 \
3543 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3544 "Minimum code cache size (in bytes) required to start VM.") \
3545 \
3546 product(bool, SegmentedCodeCache, false, \
3547 "Use a segmented code cache") \
3548 \
3549 product_pd(uintx, ReservedCodeCacheSize, \
3550 "Reserved code cache size (in bytes) - maximum code cache size") \
3551 \
3552 product_pd(uintx, NonProfiledCodeHeapSize, \
3553 "Size of code heap with non-profiled methods (in bytes)") \
3554 \
3555 product_pd(uintx, ProfiledCodeHeapSize, \
3556 "Size of code heap with profiled methods (in bytes)") \
3557 \
3558 product_pd(uintx, NonNMethodCodeHeapSize, \
3559 "Size of code heap with non-nmethods (in bytes)") \
3560 \
3561 product_pd(uintx, CodeCacheExpansionSize, \
3562 "Code cache expansion size (in bytes)") \
3563 \
3564 develop_pd(uintx, CodeCacheMinBlockLength, \
3565 "Minimum number of segments in a code cache block") \
3566 range(1, 100) \
3567 \
3568 notproduct(bool, ExitOnFullCodeCache, false, \
3569 "Exit the VM if we fill the code cache") \
3570 \
3571 product(bool, UseCodeCacheFlushing, true, \
3572 "Remove cold/old nmethods from the code cache") \
3573 \
3574 product(uintx, StartAggressiveSweepingAt, 10, \
3575 "Start aggressive sweeping if X[%] of the code cache is free." \
3576 "Segmented code cache: X[%] of the non-profiled heap." \
3577 "Non-segmented code cache: X[%] of the total code cache") \
3578 range(0, 100) \
3579 \
3580 /* interpreter debugging */ \
3581 develop(intx, BinarySwitchThreshold, 5, \
3582 "Minimal number of lookupswitch entries for rewriting to binary " \
3583 "switch") \
3584 \
3585 develop(intx, StopInterpreterAt, 0, \
3586 "Stop interpreter execution at specified bytecode number") \
3587 \
3588 develop(intx, TraceBytecodesAt, 0, \
3589 "Trace bytecodes starting with specified bytecode number") \
3590 \
3591 /* compiler interface */ \
3592 develop(intx, CIStart, 0, \
3593 "The id of the first compilation to permit") \
3594 \
3595 develop(intx, CIStop, max_jint, \
3596 "The id of the last compilation to permit") \
3597 \
3598 develop(intx, CIStartOSR, 0, \
3599 "The id of the first osr compilation to permit " \
3600 "(CICountOSR must be on)") \
3601 \
3602 develop(intx, CIStopOSR, max_jint, \
3603 "The id of the last osr compilation to permit " \
3604 "(CICountOSR must be on)") \
3605 \
3606 develop(intx, CIBreakAtOSR, -1, \
3607 "The id of osr compilation to break at") \
3608 \
3609 develop(intx, CIBreakAt, -1, \
3610 "The id of compilation to break at") \
3611 \
3612 product(ccstrlist, CompileOnly, "", \
3613 "List of methods (pkg/class.name) to restrict compilation to") \
3614 \
3615 product(ccstr, CompileCommandFile, NULL, \
3616 "Read compiler commands from this file [.hotspot_compiler]") \
3617 \
3618 product(ccstrlist, CompileCommand, "", \
3619 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3620 \
3621 develop(bool, ReplayCompiles, false, \
3622 "Enable replay of compilations from ReplayDataFile") \
3623 \
3624 product(ccstr, ReplayDataFile, NULL, \
3625 "File containing compilation replay information" \
3626 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3627 \
3628 product(ccstr, InlineDataFile, NULL, \
3629 "File containing inlining replay information" \
3630 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3631 \
3632 develop(intx, ReplaySuppressInitializers, 2, \
3633 "Control handling of class initialization during replay: " \
3634 "0 - don't do anything special; " \
3635 "1 - treat all class initializers as empty; " \
3636 "2 - treat class initializers for application classes as empty; " \
3637 "3 - allow all class initializers to run during bootstrap but " \
3638 " pretend they are empty after starting replay") \
3639 range(0, 3) \
3640 \
3641 develop(bool, ReplayIgnoreInitErrors, false, \
3642 "Ignore exceptions thrown during initialization for replay") \
3643 \
3644 product(bool, DumpReplayDataOnError, true, \
3645 "Record replay data for crashing compiler threads") \
3646 \
3647 product(bool, CICompilerCountPerCPU, false, \
3648 "1 compiler thread for log(N CPUs)") \
3649 \
3650 develop(intx, CIFireOOMAt, -1, \
3651 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3652 "(non-negative value throws OOM after this many CI accesses " \
3653 "in each compile)") \
3654 notproduct(intx, CICrashAt, -1, \
3655 "id of compilation to trigger assert in compiler thread for " \
3656 "the purpose of testing, e.g. generation of replay data") \
3657 notproduct(bool, CIObjectFactoryVerify, false, \
3658 "enable potentially expensive verification in ciObjectFactory") \
3659 \
3660 /* Priorities */ \
3661 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3662 \
3663 product(intx, ThreadPriorityPolicy, 0, \
3664 "0 : Normal. "\
3665 " VM chooses priorities that are appropriate for normal "\
3666 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3667 " to normal native priority. Java priorities below " \
3668 " NORM_PRIORITY map to lower native priority values. On "\
3669 " Windows applications are allowed to use higher native "\
3670 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3671 " not use the highest possible native priority, "\
3672 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3673 " system threads. On Linux thread priorities are ignored "\
3674 " because the OS does not support static priority in "\
3675 " SCHED_OTHER scheduling class which is the only choice for "\
3676 " non-root, non-realtime applications. "\
3677 "1 : Aggressive. "\
3678 " Java thread priorities map over to the entire range of "\
3679 " native thread priorities. Higher Java thread priorities map "\
3680 " to higher native thread priorities. This policy should be "\
3681 " used with care, as sometimes it can cause performance "\
3682 " degradation in the application and/or the entire system. On "\
3683 " Linux this policy requires root privilege.") \
3684 range(0, 1) \
3685 \
3686 product(bool, ThreadPriorityVerbose, false, \
3687 "Print priority changes") \
3688 \
3689 product(intx, CompilerThreadPriority, -1, \
3690 "The native priority at which compiler threads should run " \
3691 "(-1 means no change)") \
3692 \
3693 product(intx, VMThreadPriority, -1, \
3694 "The native priority at which the VM thread should run " \
3695 "(-1 means no change)") \
3696 \
3697 product(bool, CompilerThreadHintNoPreempt, true, \
3698 "(Solaris only) Give compiler threads an extra quanta") \
3699 \
3700 product(bool, VMThreadHintNoPreempt, false, \
3701 "(Solaris only) Give VM thread an extra quanta") \
3702 \
3703 product(intx, JavaPriority1_To_OSPriority, -1, \
3704 "Map Java priorities to OS priorities") \
3705 \
3706 product(intx, JavaPriority2_To_OSPriority, -1, \
3707 "Map Java priorities to OS priorities") \
3708 \
3709 product(intx, JavaPriority3_To_OSPriority, -1, \
3710 "Map Java priorities to OS priorities") \
3711 \
3712 product(intx, JavaPriority4_To_OSPriority, -1, \
3713 "Map Java priorities to OS priorities") \
3714 \
3715 product(intx, JavaPriority5_To_OSPriority, -1, \
3716 "Map Java priorities to OS priorities") \
3717 \
3718 product(intx, JavaPriority6_To_OSPriority, -1, \
3719 "Map Java priorities to OS priorities") \
3720 \
3721 product(intx, JavaPriority7_To_OSPriority, -1, \
3722 "Map Java priorities to OS priorities") \
3723 \
3724 product(intx, JavaPriority8_To_OSPriority, -1, \
3725 "Map Java priorities to OS priorities") \
3726 \
3727 product(intx, JavaPriority9_To_OSPriority, -1, \
3728 "Map Java priorities to OS priorities") \
3729 \
3730 product(intx, JavaPriority10_To_OSPriority,-1, \
3731 "Map Java priorities to OS priorities") \
3732 \
3733 experimental(bool, UseCriticalJavaThreadPriority, false, \
3734 "Java thread priority 10 maps to critical scheduling priority") \
3735 \
3736 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3737 "Compiler thread(s) run at critical scheduling priority") \
3738 \
3739 experimental(bool, UseCriticalCMSThreadPriority, false, \
3740 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3741 \
3742 /* compiler debugging */ \
3743 notproduct(intx, CompileTheWorldStartAt, 1, \
3744 "First class to consider when using +CompileTheWorld") \
3745 \
3746 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3747 "Last class to consider when using +CompileTheWorld") \
3748 \
3749 develop(intx, NewCodeParameter, 0, \
3750 "Testing Only: Create a dedicated integer parameter before " \
3751 "putback") \
3752 \
3753 /* new oopmap storage allocation */ \
3754 develop(intx, MinOopMapAllocation, 8, \
3755 "Minimum number of OopMap entries in an OopMapSet") \
3756 \
3757 /* Background Compilation */ \
3758 develop(intx, LongCompileThreshold, 50, \
3759 "Used with +TraceLongCompiles") \
3760 \
3761 /* recompilation */ \
3762 product_pd(intx, CompileThreshold, \
3763 "number of interpreted method invocations before (re-)compiling") \
3764 \
3765 product(double, CompileThresholdScaling, 1.0, \
3766 "Factor to control when first compilation happens " \
3767 "(both with and without tiered compilation): " \
3768 "values greater than 1.0 delay counter overflow, " \
3769 "values between 0 and 1.0 rush counter overflow, " \
3770 "value of 1.0 leaves compilation thresholds unchanged " \
3771 "value of 0.0 is equivalent to -Xint. " \
3772 "" \
3773 "Flag can be set as per-method option. " \
3774 "If a value is specified for a method, compilation thresholds " \
3775 "for that method are scaled by both the value of the global flag "\
3776 "and the value of the per-method flag.") \
3777 \
3778 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3779 "Interpreter (tier 0) invocation notification frequency") \
3780 \
3781 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3782 "C1 without MDO (tier 2) invocation notification frequency") \
3783 \
3784 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3785 "C1 with MDO profiling (tier 3) invocation notification " \
3786 "frequency") \
3787 \
3788 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3789 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3790 \
3791 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3792 "Interpreter (tier 0) invocation notification frequency") \
3793 \
3794 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3795 "C1 without MDO (tier 2) invocation notification frequency") \
3796 \
3797 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3798 "C1 with MDO profiling (tier 3) invocation notification " \
3799 "frequency") \
3800 \
3801 product(intx, Tier2CompileThreshold, 0, \
3802 "threshold at which tier 2 compilation is invoked") \
3803 \
3804 product(intx, Tier2BackEdgeThreshold, 0, \
3805 "Back edge threshold at which tier 2 compilation is invoked") \
3806 \
3807 product(intx, Tier3InvocationThreshold, 200, \
3808 "Compile if number of method invocations crosses this " \
3809 "threshold") \
3810 \
3811 product(intx, Tier3MinInvocationThreshold, 100, \
3812 "Minimum invocation to compile at tier 3") \
3813 \
3814 product(intx, Tier3CompileThreshold, 2000, \
3815 "Threshold at which tier 3 compilation is invoked (invocation " \
3816 "minimum must be satisfied") \
3817 \
3818 product(intx, Tier3BackEdgeThreshold, 60000, \
3819 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3820 \
3821 product(intx, Tier4InvocationThreshold, 5000, \
3822 "Compile if number of method invocations crosses this " \
3823 "threshold") \
3824 \
3825 product(intx, Tier4MinInvocationThreshold, 600, \
3826 "Minimum invocation to compile at tier 4") \
3827 \
3828 product(intx, Tier4CompileThreshold, 15000, \
3829 "Threshold at which tier 4 compilation is invoked (invocation " \
3830 "minimum must be satisfied") \
3831 \
3832 product(intx, Tier4BackEdgeThreshold, 40000, \
3833 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3834 \
3835 product(intx, Tier3DelayOn, 5, \
3836 "If C2 queue size grows over this amount per compiler thread " \
3837 "stop compiling at tier 3 and start compiling at tier 2") \
3838 \
3839 product(intx, Tier3DelayOff, 2, \
3840 "If C2 queue size is less than this amount per compiler thread " \
3841 "allow methods compiled at tier 2 transition to tier 3") \
3842 \
3843 product(intx, Tier3LoadFeedback, 5, \
3844 "Tier 3 thresholds will increase twofold when C1 queue size " \
3845 "reaches this amount per compiler thread") \
3846 \
3847 product(intx, Tier4LoadFeedback, 3, \
3848 "Tier 4 thresholds will increase twofold when C2 queue size " \
3849 "reaches this amount per compiler thread") \
3850 \
3851 product(intx, TieredCompileTaskTimeout, 50, \
3852 "Kill compile task if method was not used within " \
3853 "given timeout in milliseconds") \
3854 \
3855 product(intx, TieredStopAtLevel, 4, \
3856 "Stop at given compilation level") \
3857 \
3858 product(intx, Tier0ProfilingStartPercentage, 200, \
3859 "Start profiling in interpreter if the counters exceed tier 3 " \
3860 "thresholds by the specified percentage") \
3861 \
3862 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3863 "Increase the compile threshold for C1 compilation if the code " \
3864 "cache is filled by the specified percentage") \
3865 range(0, 99) \
3866 \
3867 product(intx, TieredRateUpdateMinTime, 1, \
3868 "Minimum rate sampling interval (in milliseconds)") \
3869 \
3870 product(intx, TieredRateUpdateMaxTime, 25, \
3871 "Maximum rate sampling interval (in milliseconds)") \
3872 \
3873 product_pd(bool, TieredCompilation, \
3874 "Enable tiered compilation") \
3875 \
3876 product(bool, PrintTieredEvents, false, \
3877 "Print tiered events notifications") \
3878 \
3879 product_pd(intx, OnStackReplacePercentage, \
3880 "NON_TIERED number of method invocations/branches (expressed as " \
3881 "% of CompileThreshold) before (re-)compiling OSR code") \
3882 \
3883 product(intx, InterpreterProfilePercentage, 33, \
3884 "NON_TIERED number of method invocations/branches (expressed as " \
3885 "% of CompileThreshold) before profiling in the interpreter") \
3886 range(0, 100) \
3887 \
3888 develop(intx, MaxRecompilationSearchLength, 10, \
3889 "The maximum number of frames to inspect when searching for " \
3890 "recompilee") \
3891 \
3892 develop(intx, MaxInterpretedSearchLength, 3, \
3893 "The maximum number of interpreted frames to skip when searching "\
3894 "for recompilee") \
3895 \
3896 develop(intx, DesiredMethodLimit, 8000, \
3897 "The desired maximum method size (in bytecodes) after inlining") \
3898 \
3899 develop(intx, HugeMethodLimit, 8000, \
3900 "Don't compile methods larger than this if " \
3901 "+DontCompileHugeMethods") \
3902 \
3903 /* New JDK 1.4 reflection implementation */ \
3904 \
3905 develop(intx, FastSuperclassLimit, 8, \
3906 "Depth of hardwired instanceof accelerator array") \
3907 \
3908 /* Properties for Java libraries */ \
3909 \
3910 product(size_t, MaxDirectMemorySize, 0, \
3911 "Maximum total size of NIO direct-buffer allocations") \
3912 \
3913 /* Flags used for temporary code during development */ \
3914 \
3915 diagnostic(bool, UseNewCode, false, \
3916 "Testing Only: Use the new version while testing") \
3917 \
3918 diagnostic(bool, UseNewCode2, false, \
3919 "Testing Only: Use the new version while testing") \
3920 \
3921 diagnostic(bool, UseNewCode3, false, \
3922 "Testing Only: Use the new version while testing") \
3923 \
3924 /* flags for performance data collection */ \
3925 \
3926 product(bool, UsePerfData, falseInEmbedded, \
3927 "Flag to disable jvmstat instrumentation for performance testing "\
3928 "and problem isolation purposes") \
3929 \
3930 product(bool, PerfDataSaveToFile, false, \
3931 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3932 \
3933 product(ccstr, PerfDataSaveFile, NULL, \
3934 "Save PerfData memory to the specified absolute pathname. " \
3935 "The string %p in the file name (if present) " \
3936 "will be replaced by pid") \
3937 \
3938 product(intx, PerfDataSamplingInterval, 50, \
3939 "Data sampling interval (in milliseconds)") \
3940 \
3941 develop(bool, PerfTraceDataCreation, false, \
3942 "Trace creation of Performance Data Entries") \
3943 \
3944 develop(bool, PerfTraceMemOps, false, \
3945 "Trace PerfMemory create/attach/detach calls") \
3946 \
3947 product(bool, PerfDisableSharedMem, false, \
3948 "Store performance data in standard memory") \
3949 \
3950 product(intx, PerfDataMemorySize, 64*K, \
3951 "Size of performance data memory region. Will be rounded " \
3952 "up to a multiple of the native os page size.") \
3953 \
3954 product(intx, PerfMaxStringConstLength, 1024, \
3955 "Maximum PerfStringConstant string length before truncation") \
3956 \
3957 product(bool, PerfAllowAtExitRegistration, false, \
3958 "Allow registration of atexit() methods") \
3959 \
3960 product(bool, PerfBypassFileSystemCheck, false, \
3961 "Bypass Win32 file system criteria checks (Windows Only)") \
3962 \
3963 product(intx, UnguardOnExecutionViolation, 0, \
3964 "Unguard page and retry on no-execute fault (Win32 only) " \
3965 "0=off, 1=conservative, 2=aggressive") \
3966 range(0, 2) \
3967 \
3968 /* Serviceability Support */ \
3969 \
3970 product(bool, ManagementServer, false, \
3971 "Create JMX Management Server") \
3972 \
3973 product(bool, DisableAttachMechanism, false, \
3974 "Disable mechanism that allows tools to attach to this VM") \
3975 \
3976 product(bool, StartAttachListener, false, \
3977 "Always start Attach Listener at VM startup") \
3978 \
3979 manageable(bool, PrintConcurrentLocks, false, \
3980 "Print java.util.concurrent locks in thread dump") \
3981 \
3982 product(bool, TransmitErrorReport, false, \
3983 "Enable error report transmission on erroneous termination") \
3984 \
3985 product(ccstr, ErrorReportServer, NULL, \
3986 "Override built-in error report server address") \
3987 \
3988 /* Shared spaces */ \
3989 \
3990 product(bool, UseSharedSpaces, true, \
3991 "Use shared spaces for metadata") \
3992 \
3993 product(bool, VerifySharedSpaces, false, \
3994 "Verify shared spaces (false for default archive, true for " \
3995 "archive specified by -XX:SharedArchiveFile)") \
3996 \
3997 product(bool, RequireSharedSpaces, false, \
3998 "Require shared spaces for metadata") \
3999 \
4000 product(bool, DumpSharedSpaces, false, \
4001 "Special mode: JVM reads a class list, loads classes, builds " \
4002 "shared spaces, and dumps the shared spaces to a file to be " \
4003 "used in future JVM runs") \
4004 \
4005 product(bool, PrintSharedSpaces, false, \
4006 "Print usage of shared spaces") \
4007 \
4008 product(bool, PrintSharedArchiveAndExit, false, \
4009 "Print shared archive file contents") \
4010 \
4011 product(bool, PrintSharedDictionary, false, \
4012 "If PrintSharedArchiveAndExit is true, also print the shared " \
4013 "dictionary") \
4014 \
4015 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4016 "Size of read-write space for metadata (in bytes)") \
4017 \
4018 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4019 "Size of read-only space for metadata (in bytes)") \
4020 \
4021 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
4022 "Size of the shared miscellaneous data area (in bytes)") \
4023 \
4024 product(uintx, SharedMiscCodeSize, 120*K, \
4025 "Size of the shared miscellaneous code area (in bytes)") \
4026 \
4027 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
4028 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4029 "Address to allocate shared memory region for class data") \
4030 \
4031 product(uintx, SharedSymbolTableBucketSize, 4, \
4032 "Average number of symbols per bucket in shared table") \
4033 \
4034 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4035 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4036 "classes. Just exclude them from the shared dictionary.") \
4037 \
4038 diagnostic(bool, PrintMethodHandleStubs, false, \
4039 "Print generated stub code for method handles") \
4040 \
4041 develop(bool, TraceMethodHandles, false, \
4042 "trace internal method handle operations") \
4043 \
4044 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4045 "perform extra checks when constructing method handles") \
4046 \
4047 diagnostic(bool, ShowHiddenFrames, false, \
4048 "show method handle implementation frames (usually hidden)") \
4049 \
4050 experimental(bool, TrustFinalNonStaticFields, false, \
4051 "trust final non-static declarations for constant folding") \
4052 \
4053 diagnostic(bool, FoldStableValues, true, \
4054 "Optimize loads from stable fields (marked w/ @Stable)") \
4055 \
4056 develop(bool, TraceInvokeDynamic, false, \
4057 "trace internal invoke dynamic operations") \
4058 \
4059 diagnostic(bool, PauseAtStartup, false, \
4060 "Causes the VM to pause at startup time and wait for the pause " \
4061 "file to be removed (default: ./vm.paused.<pid>)") \
4062 \
4063 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4064 "The file to create and for whose removal to await when pausing " \
4065 "at startup. (default: ./vm.paused.<pid>)") \
4066 \
4067 diagnostic(bool, PauseAtExit, false, \
4068 "Pause and wait for keypress on exit if a debugger is attached") \
4069 \
4070 product(bool, ExtendedDTraceProbes, false, \
4071 "Enable performance-impacting dtrace probes") \
4072 \
4073 product(bool, DTraceMethodProbes, false, \
4074 "Enable dtrace probes for method-entry and method-exit") \
4075 \
4076 product(bool, DTraceAllocProbes, false, \
4077 "Enable dtrace probes for object allocation") \
4078 \
4079 product(bool, DTraceMonitorProbes, false, \
4080 "Enable dtrace probes for monitor events") \
4081 \
4082 product(bool, RelaxAccessControlCheck, false, \
4083 "Relax the access control checks in the verifier") \
4084 \
4085 product(uintx, StringTableSize, defaultStringTableSize, \
4086 "Number of buckets in the interned String table") \
4087 range(minimumStringTableSize, 111*defaultStringTableSize) \
4088 \
4089 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4090 "Number of buckets in the JVM internal Symbol table") \
4091 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4092 \
4093 product(bool, UseStringDeduplication, false, \
4094 "Use string deduplication") \
4095 \
4096 product(bool, PrintStringDeduplicationStatistics, false, \
4097 "Print string deduplication statistics") \
4098 \
4099 product(uintx, StringDeduplicationAgeThreshold, 3, \
4100 "A string must reach this age (or be promoted to an old region) " \
4101 "to be considered for deduplication") \
4102 range(1, markOopDesc::max_age) \
4103 \
4104 diagnostic(bool, StringDeduplicationResizeALot, false, \
4105 "Force table resize every time the table is scanned") \
4106 \
4107 diagnostic(bool, StringDeduplicationRehashALot, false, \
4108 "Force table rehash every time the table is scanned") \
4109 \
4110 develop(bool, TraceDefaultMethods, false, \
4111 "Trace the default method processing steps") \
4112 \
4113 diagnostic(bool, WhiteBoxAPI, false, \
4114 "Enable internal testing APIs") \
4115 \
4116 product(bool, PrintGCCause, true, \
4117 "Include GC cause in GC logging") \
4118 \
4119 experimental(intx, SurvivorAlignmentInBytes, 0, \
4120 "Default survivor space alignment in bytes") \
4121 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4122 \
4123 product(bool , AllowNonVirtualCalls, false, \
4124 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4125 \
4126 product(ccstr, DumpLoadedClassList, NULL, \
4127 "Dump the names all loaded classes, that could be stored into " \
4128 "the CDS archive, in the specified file") \
4129 \
4130 product(ccstr, SharedClassListFile, NULL, \
4131 "Override the default CDS class list") \
4132 \
4133 diagnostic(ccstr, SharedArchiveFile, NULL, \
4134 "Override the default location of the CDS archive file") \
4135 \
4136 product(ccstr, ExtraSharedClassListFile, NULL, \
4137 "Extra classlist for building the CDS archive file") \
4138 \
4139 experimental(size_t, ArrayAllocatorMallocLimit, \
4140 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4141 "Allocation less than this value will be allocated " \
4142 "using malloc. Larger allocations will use mmap.") \
4143 \
4144 experimental(bool, AlwaysAtomicAccesses, false, \
4145 "Accesses to all variables should always be atomic") \
4146 \
4147 product(bool, EnableTracing, false, \
4148 "Enable event-based tracing") \
4149 \
4150 product(bool, UseLockedTracing, false, \
4151 "Use locked-tracing when doing event-based tracing") \
4152 \
4153 diagnostic(bool, UseUnalignedAccesses, false, \
4154 "Use unaligned memory accesses in sun.misc.Unsafe") \
4155 \
4156 product_pd(bool, PreserveFramePointer, \
4157 "Use the FP register for holding the frame pointer " \
4158 "and not as a general purpose register.") \
4159 \
4160 diagnostic(bool, CheckIntrinsics, true, \
4161 "When a class C is loaded, check that " \
4162 "(1) all intrinsics defined by the VM for class C are present "\
4163 "in the loaded class file and are marked with the " \
4164 "@HotSpotIntrinsicCandidate annotation, that " \
4165 "(2) there is an intrinsic registered for all loaded methods " \
4166 "that are annotated with the @HotSpotIntrinsicCandidate " \
4167 "annotation, and that " \
4168 "(3) no orphan methods exist for class C (i.e., methods for " \
4169 "which the VM declares an intrinsic but that are not declared "\
4170 "in the loaded class C. " \
4171 "Check (3) is available only in debug builds.")
4172
4173 /*
4174 * Macros for factoring of globals
4175 */
4176
4177 // Interface macros
4178 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4179 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4180 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4181 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4182 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4183 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4184 #ifdef PRODUCT
4185 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4186 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4187 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4188 #else
4189 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4190 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4191 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4192 #endif // PRODUCT
4193 // Special LP64 flags, product only needed for now.
4194 #ifdef _LP64
4195 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4196 #else
4197 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4198 #endif // _LP64
4199
4200 // Implementation macros
4201 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4202 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4203 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4204 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4205 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4206 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4207 #ifdef PRODUCT
4208 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4209 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4210 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4211 #else
4212 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4213 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4214 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4215 #endif // PRODUCT
4216 #ifdef _LP64
4217 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4218 #else
4219 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4220 #endif // _LP64
4221
4222 // Only materialize src code for range checking when required, ignore otherwise
4223 #define IGNORE_RANGE(a, b)
4224 // Only materialize src code for contraint checking when required, ignore otherwise
4225 #define IGNORE_CONSTRAINT(func,type)
4226
4227 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4228 DECLARE_PD_DEVELOPER_FLAG, \
4229 DECLARE_PRODUCT_FLAG, \
4230 DECLARE_PD_PRODUCT_FLAG, \
4231 DECLARE_DIAGNOSTIC_FLAG, \
4232 DECLARE_EXPERIMENTAL_FLAG, \
4233 DECLARE_NOTPRODUCT_FLAG, \
4234 DECLARE_MANAGEABLE_FLAG, \
4235 DECLARE_PRODUCT_RW_FLAG, \
4236 DECLARE_LP64_PRODUCT_FLAG, \
4237 IGNORE_RANGE, \
4238 IGNORE_CONSTRAINT)
4239
4240 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4241 DECLARE_PD_DEVELOPER_FLAG, \
4242 DECLARE_PRODUCT_FLAG, \
4243 DECLARE_PD_PRODUCT_FLAG, \
4244 DECLARE_DIAGNOSTIC_FLAG, \
4245 DECLARE_NOTPRODUCT_FLAG, \
4246 IGNORE_RANGE, \
4247 IGNORE_CONSTRAINT)
4248
4249 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4250 DECLARE_PRODUCT_FLAG, \
4251 DECLARE_DIAGNOSTIC_FLAG, \
4252 DECLARE_EXPERIMENTAL_FLAG, \
4253 DECLARE_NOTPRODUCT_FLAG, \
4254 IGNORE_RANGE, \
4255 IGNORE_CONSTRAINT)
4256
4257 // Extensions
4258
4259 #include "runtime/globals_ext.hpp"
4260
4261 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP