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src/share/vm/runtime/globals.hpp@b4d8a3d4db73
src/share/vm/runtime/globals.hpp
Wed, 09 Oct 2013 11:18:53 -0700
- author
- tamao
- date
- Wed, 09 Oct 2013 11:18:53 -0700
- changeset 5861
- b4d8a3d4db73
- parent 5755
- 0f37d1badced
- child 5863
- 85c1ca43713f
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- -rw-r--r--
8010506: Typos and errors in descriptions of vm options in globals.hpp
Summary: Fix typos and errors in descriptions of vm options in globals.hpp
Reviewed-by: jmasa, jwilhelm
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
28 #include "utilities/debug.hpp"
30 // use this for flags that are true per default in the tiered build
31 // but false in non-tiered builds, and vice versa
32 #ifdef TIERED
33 #define trueInTiered true
34 #define falseInTiered false
35 #else
36 #define trueInTiered false
37 #define falseInTiered true
38 #endif
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_linux
56 # include "globals_linux.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_solaris
59 # include "globals_solaris.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_windows
62 # include "globals_windows.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_bsd
65 # include "globals_bsd.hpp"
66 #endif
67 #ifdef TARGET_OS_ARCH_linux_x86
68 # include "globals_linux_x86.hpp"
69 #endif
70 #ifdef TARGET_OS_ARCH_linux_sparc
71 # include "globals_linux_sparc.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_zero
74 # include "globals_linux_zero.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_solaris_x86
77 # include "globals_solaris_x86.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_solaris_sparc
80 # include "globals_solaris_sparc.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_windows_x86
83 # include "globals_windows_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_linux_arm
86 # include "globals_linux_arm.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_linux_ppc
89 # include "globals_linux_ppc.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_bsd_x86
92 # include "globals_bsd_x86.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_bsd_zero
95 # include "globals_bsd_zero.hpp"
96 #endif
97 #ifdef COMPILER1
98 #ifdef TARGET_ARCH_x86
99 # include "c1_globals_x86.hpp"
100 #endif
101 #ifdef TARGET_ARCH_sparc
102 # include "c1_globals_sparc.hpp"
103 #endif
104 #ifdef TARGET_ARCH_arm
105 # include "c1_globals_arm.hpp"
106 #endif
107 #ifdef TARGET_ARCH_ppc
108 # include "c1_globals_ppc.hpp"
109 #endif
110 #ifdef TARGET_OS_FAMILY_linux
111 # include "c1_globals_linux.hpp"
112 #endif
113 #ifdef TARGET_OS_FAMILY_solaris
114 # include "c1_globals_solaris.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_windows
117 # include "c1_globals_windows.hpp"
118 #endif
119 #ifdef TARGET_OS_FAMILY_bsd
120 # include "c1_globals_bsd.hpp"
121 #endif
122 #endif
123 #ifdef COMPILER2
124 #ifdef TARGET_ARCH_x86
125 # include "c2_globals_x86.hpp"
126 #endif
127 #ifdef TARGET_ARCH_sparc
128 # include "c2_globals_sparc.hpp"
129 #endif
130 #ifdef TARGET_ARCH_arm
131 # include "c2_globals_arm.hpp"
132 #endif
133 #ifdef TARGET_OS_FAMILY_linux
134 # include "c2_globals_linux.hpp"
135 #endif
136 #ifdef TARGET_OS_FAMILY_solaris
137 # include "c2_globals_solaris.hpp"
138 #endif
139 #ifdef TARGET_OS_FAMILY_windows
140 # include "c2_globals_windows.hpp"
141 #endif
142 #ifdef TARGET_OS_FAMILY_bsd
143 # include "c2_globals_bsd.hpp"
144 #endif
145 #endif
146 #ifdef SHARK
147 #ifdef TARGET_ARCH_zero
148 # include "shark_globals_zero.hpp"
149 #endif
150 #endif
152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
153 define_pd_global(bool, BackgroundCompilation, false);
154 define_pd_global(bool, UseTLAB, false);
155 define_pd_global(bool, CICompileOSR, false);
156 define_pd_global(bool, UseTypeProfile, false);
157 define_pd_global(bool, UseOnStackReplacement, false);
158 define_pd_global(bool, InlineIntrinsics, false);
159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
160 define_pd_global(bool, ProfileInterpreter, false);
161 define_pd_global(bool, ProfileTraps, false);
162 define_pd_global(bool, TieredCompilation, false);
164 define_pd_global(intx, CompileThreshold, 0);
165 define_pd_global(intx, BackEdgeThreshold, 0);
167 define_pd_global(intx, OnStackReplacePercentage, 0);
168 define_pd_global(bool, ResizeTLAB, false);
169 define_pd_global(intx, FreqInlineSize, 0);
170 define_pd_global(intx, InlineSmallCode, 0);
171 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
172 define_pd_global(intx, InlineClassNatives, true);
173 define_pd_global(intx, InlineUnsafeOps, true);
174 define_pd_global(intx, InitialCodeCacheSize, 160*K);
175 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
176 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
177 define_pd_global(intx, CodeCacheMinBlockLength, 1);
178 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
179 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M));
180 define_pd_global(bool, NeverActAsServerClassMachine, true);
181 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
182 #define CI_COMPILER_COUNT 0
183 #else
185 #ifdef COMPILER2
186 #define CI_COMPILER_COUNT 2
187 #else
188 #define CI_COMPILER_COUNT 1
189 #endif // COMPILER2
191 #endif // no compilers
193 // string type aliases used only in this file
194 typedef const char* ccstr;
195 typedef const char* ccstrlist; // represents string arguments which accumulate
197 enum FlagValueOrigin {
198 DEFAULT = 0,
199 COMMAND_LINE = 1,
200 ENVIRON_VAR = 2,
201 CONFIG_FILE = 3,
202 MANAGEMENT = 4,
203 ERGONOMIC = 5,
204 ATTACH_ON_DEMAND = 6,
205 INTERNAL = 99
206 };
208 struct Flag {
209 const char *type;
210 const char *name;
211 void* addr;
213 NOT_PRODUCT(const char *doc;)
215 const char *kind;
216 FlagValueOrigin origin;
218 // points to all Flags static array
219 static Flag *flags;
221 // number of flags
222 static size_t numFlags;
224 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
225 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
227 bool is_bool() const { return strcmp(type, "bool") == 0; }
228 bool get_bool() const { return *((bool*) addr); }
229 void set_bool(bool value) { *((bool*) addr) = value; }
231 bool is_intx() const { return strcmp(type, "intx") == 0; }
232 intx get_intx() const { return *((intx*) addr); }
233 void set_intx(intx value) { *((intx*) addr) = value; }
235 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
236 uintx get_uintx() const { return *((uintx*) addr); }
237 void set_uintx(uintx value) { *((uintx*) addr) = value; }
239 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
240 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
241 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
243 bool is_double() const { return strcmp(type, "double") == 0; }
244 double get_double() const { return *((double*) addr); }
245 void set_double(double value) { *((double*) addr) = value; }
247 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
248 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
249 ccstr get_ccstr() const { return *((ccstr*) addr); }
250 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
252 bool is_unlocker() const;
253 bool is_unlocked() const;
254 bool is_writeable() const;
255 bool is_external() const;
257 bool is_unlocker_ext() const;
258 bool is_unlocked_ext() const;
259 bool is_writeable_ext() const;
260 bool is_external_ext() const;
262 void get_locked_message(char*, int) const;
263 void get_locked_message_ext(char*, int) const;
265 void print_on(outputStream* st, bool withComments = false );
266 void print_as_flag(outputStream* st);
267 };
269 // debug flags control various aspects of the VM and are global accessible
271 // use FlagSetting to temporarily change some debug flag
272 // e.g. FlagSetting fs(DebugThisAndThat, true);
273 // restored to previous value upon leaving scope
274 class FlagSetting {
275 bool val;
276 bool* flag;
277 public:
278 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
279 ~FlagSetting() { *flag = val; }
280 };
283 class CounterSetting {
284 intx* counter;
285 public:
286 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
287 ~CounterSetting() { (*counter)--; }
288 };
291 class UIntFlagSetting {
292 uintx val;
293 uintx* flag;
294 public:
295 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
296 ~UIntFlagSetting() { *flag = val; }
297 };
300 class DoubleFlagSetting {
301 double val;
302 double* flag;
303 public:
304 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
305 ~DoubleFlagSetting() { *flag = val; }
306 };
309 class CommandLineFlags {
310 public:
311 static bool boolAt(char* name, size_t len, bool* value);
312 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
313 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
314 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
316 static bool intxAt(char* name, size_t len, intx* value);
317 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
318 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
319 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
321 static bool uintxAt(char* name, size_t len, uintx* value);
322 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
323 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
324 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
326 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
327 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
328 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
329 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
331 static bool doubleAt(char* name, size_t len, double* value);
332 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
333 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
334 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
336 static bool ccstrAt(char* name, size_t len, ccstr* value);
337 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
338 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
339 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
341 // Returns false if name is not a command line flag.
342 static bool wasSetOnCmdline(const char* name, bool* value);
343 static void printSetFlags(outputStream* out);
345 static void printFlags(outputStream* out, bool withComments);
347 static void verify() PRODUCT_RETURN;
348 };
350 // use this for flags that are true by default in the debug version but
351 // false in the optimized version, and vice versa
352 #ifdef ASSERT
353 #define trueInDebug true
354 #define falseInDebug false
355 #else
356 #define trueInDebug false
357 #define falseInDebug true
358 #endif
360 // use this for flags that are true per default in the product build
361 // but false in development builds, and vice versa
362 #ifdef PRODUCT
363 #define trueInProduct true
364 #define falseInProduct false
365 #else
366 #define trueInProduct false
367 #define falseInProduct true
368 #endif
370 #ifdef JAVASE_EMBEDDED
371 #define falseInEmbedded false
372 #else
373 #define falseInEmbedded true
374 #endif
376 // develop flags are settable / visible only during development and are constant in the PRODUCT version
377 // product flags are always settable / visible
378 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
380 // A flag must be declared with one of the following types:
381 // bool, intx, uintx, ccstr.
382 // The type "ccstr" is an alias for "const char*" and is used
383 // only in this file, because the macrology requires single-token type names.
385 // Note: Diagnostic options not meant for VM tuning or for product modes.
386 // They are to be used for VM quality assurance or field diagnosis
387 // of VM bugs. They are hidden so that users will not be encouraged to
388 // try them as if they were VM ordinary execution options. However, they
389 // are available in the product version of the VM. Under instruction
390 // from support engineers, VM customers can turn them on to collect
391 // diagnostic information about VM problems. To use a VM diagnostic
392 // option, you must first specify +UnlockDiagnosticVMOptions.
393 // (This master switch also affects the behavior of -Xprintflags.)
394 //
395 // experimental flags are in support of features that are not
396 // part of the officially supported product, but are available
397 // for experimenting with. They could, for example, be performance
398 // features that may not have undergone full or rigorous QA, but which may
399 // help performance in some cases and released for experimentation
400 // by the community of users and developers. This flag also allows one to
401 // be able to build a fully supported product that nonetheless also
402 // ships with some unsupported, lightly tested, experimental features.
403 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
404 // UnlockExperimentalVMOptions flag, which allows the control and
405 // modification of the experimental flags.
406 //
407 // Nota bene: neither diagnostic nor experimental options should be used casually,
408 // and they are not supported on production loads, except under explicit
409 // direction from support engineers.
410 //
411 // manageable flags are writeable external product flags.
412 // They are dynamically writeable through the JDK management interface
413 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
414 // These flags are external exported interface (see CCC). The list of
415 // manageable flags can be queried programmatically through the management
416 // interface.
417 //
418 // A flag can be made as "manageable" only if
419 // - the flag is defined in a CCC as an external exported interface.
420 // - the VM implementation supports dynamic setting of the flag.
421 // This implies that the VM must *always* query the flag variable
422 // and not reuse state related to the flag state at any given time.
423 // - you want the flag to be queried programmatically by the customers.
424 //
425 // product_rw flags are writeable internal product flags.
426 // They are like "manageable" flags but for internal/private use.
427 // The list of product_rw flags are internal/private flags which
428 // may be changed/removed in a future release. It can be set
429 // through the management interface to get/set value
430 // when the name of flag is supplied.
431 //
432 // A flag can be made as "product_rw" only if
433 // - the VM implementation supports dynamic setting of the flag.
434 // This implies that the VM must *always* query the flag variable
435 // and not reuse state related to the flag state at any given time.
436 //
437 // Note that when there is a need to support develop flags to be writeable,
438 // it can be done in the same way as product_rw.
440 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
441 \
442 lp64_product(bool, UseCompressedOops, false, \
443 "Use 32-bit object references in 64-bit VM. " \
444 "lp64_product means flag is always constant in 32 bit VM") \
445 \
446 lp64_product(bool, UseCompressedClassPointers, false, \
447 "Use 32-bit class pointers in 64-bit VM. " \
448 "lp64_product means flag is always constant in 32 bit VM") \
449 \
450 notproduct(bool, CheckCompressedOops, true, \
451 "Generate checks in encoding/decoding code in debug VM") \
452 \
453 product_pd(uintx, HeapBaseMinAddress, \
454 "OS specific low limit for heap base address") \
455 \
456 diagnostic(bool, PrintCompressedOopsMode, false, \
457 "Print compressed oops base address and encoding mode") \
458 \
459 lp64_product(intx, ObjectAlignmentInBytes, 8, \
460 "Default object alignment in bytes, 8 is minimum") \
461 \
462 product(bool, AssumeMP, false, \
463 "Instruct the VM to assume multiple processors are available") \
464 \
465 /* UseMembar is theoretically a temp flag used for memory barrier \
466 * removal testing. It was supposed to be removed before FCS but has \
467 * been re-added (see 6401008) */ \
468 product_pd(bool, UseMembar, \
469 "(Unstable) Issues membars on thread state transitions") \
470 \
471 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
472 * that don't support it. This will be replaced by processor detection \
473 * logic. \
474 */ \
475 product(bool, UsePPCLWSYNC, true, \
476 "Use lwsync instruction if true, else use slower sync") \
477 \
478 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
479 "Clean the chunk pool asynchronously") \
480 \
481 /* Temporary: See 6948537 */ \
482 experimental(bool, UseMemSetInBOT, true, \
483 "(Unstable) uses memset in BOT updates in GC code") \
484 \
485 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
486 "Enable normal processing of flags relating to field diagnostics")\
487 \
488 experimental(bool, UnlockExperimentalVMOptions, false, \
489 "Enable normal processing of flags relating to experimental " \
490 "features") \
491 \
492 product(bool, JavaMonitorsInStackTrace, true, \
493 "Print information about Java monitor locks when the stacks are" \
494 "dumped") \
495 \
496 product_pd(bool, UseLargePages, \
497 "Use large page memory") \
498 \
499 product_pd(bool, UseLargePagesIndividualAllocation, \
500 "Allocate large pages individually for better affinity") \
501 \
502 develop(bool, LargePagesIndividualAllocationInjectError, false, \
503 "Fail large pages individual allocation") \
504 \
505 develop(bool, TracePageSizes, false, \
506 "Trace page size selection and usage") \
507 \
508 product(bool, UseNUMA, false, \
509 "Use NUMA if available") \
510 \
511 product(bool, UseNUMAInterleaving, false, \
512 "Interleave memory across NUMA nodes if available") \
513 \
514 product(uintx, NUMAInterleaveGranularity, 2*M, \
515 "Granularity to use for NUMA interleaving on Windows OS") \
516 \
517 product(bool, ForceNUMA, false, \
518 "Force NUMA optimizations on single-node/UMA systems") \
519 \
520 product(uintx, NUMAChunkResizeWeight, 20, \
521 "Percentage (0-100) used to weigh the current sample when " \
522 "computing exponentially decaying average for " \
523 "AdaptiveNUMAChunkSizing") \
524 \
525 product(uintx, NUMASpaceResizeRate, 1*G, \
526 "Do not reallocate more than this amount per collection") \
527 \
528 product(bool, UseAdaptiveNUMAChunkSizing, true, \
529 "Enable adaptive chunk sizing for NUMA") \
530 \
531 product(bool, NUMAStats, false, \
532 "Print NUMA stats in detailed heap information") \
533 \
534 product(uintx, NUMAPageScanRate, 256, \
535 "Maximum number of pages to include in the page scan procedure") \
536 \
537 product_pd(bool, NeedsDeoptSuspend, \
538 "True for register window machines (sparc/ia64)") \
539 \
540 product(intx, UseSSE, 99, \
541 "Highest supported SSE instructions set on x86/x64") \
542 \
543 product(bool, UseAES, false, \
544 "Control whether AES instructions can be used on x86/x64") \
545 \
546 product(uintx, LargePageSizeInBytes, 0, \
547 "Large page size (0 to let VM choose the page size)") \
548 \
549 product(uintx, LargePageHeapSizeThreshold, 128*M, \
550 "Use large pages if maximum heap is at least this big") \
551 \
552 product(bool, ForceTimeHighResolution, false, \
553 "Using high time resolution (for Win32 only)") \
554 \
555 develop(bool, TraceItables, false, \
556 "Trace initialization and use of itables") \
557 \
558 develop(bool, TracePcPatching, false, \
559 "Trace usage of frame::patch_pc") \
560 \
561 develop(bool, TraceJumps, false, \
562 "Trace assembly jumps in thread ring buffer") \
563 \
564 develop(bool, TraceRelocator, false, \
565 "Trace the bytecode relocator") \
566 \
567 develop(bool, TraceLongCompiles, false, \
568 "Print out every time compilation is longer than " \
569 "a given threshold") \
570 \
571 develop(bool, SafepointALot, false, \
572 "Generate a lot of safepoints. This works with " \
573 "GuaranteedSafepointInterval") \
574 \
575 product_pd(bool, BackgroundCompilation, \
576 "A thread requesting compilation is not blocked during " \
577 "compilation") \
578 \
579 product(bool, PrintVMQWaitTime, false, \
580 "Print out the waiting time in VM operation queue") \
581 \
582 develop(bool, NoYieldsInMicrolock, false, \
583 "Disable yields in microlock") \
584 \
585 develop(bool, TraceOopMapGeneration, false, \
586 "Show OopMapGeneration") \
587 \
588 product(bool, MethodFlushing, true, \
589 "Reclamation of zombie and not-entrant methods") \
590 \
591 develop(bool, VerifyStack, false, \
592 "Verify stack of each thread when it is entering a runtime call") \
593 \
594 diagnostic(bool, ForceUnreachable, false, \
595 "Make all non code cache addresses to be unreachable by " \
596 "forcing use of 64bit literal fixups") \
597 \
598 notproduct(bool, StressDerivedPointers, false, \
599 "Force scavenge when a derived pointer is detected on stack " \
600 "after rtm call") \
601 \
602 develop(bool, TraceDerivedPointers, false, \
603 "Trace traversal of derived pointers on stack") \
604 \
605 notproduct(bool, TraceCodeBlobStacks, false, \
606 "Trace stack-walk of codeblobs") \
607 \
608 product(bool, PrintJNIResolving, false, \
609 "Used to implement -v:jni") \
610 \
611 notproduct(bool, PrintRewrites, false, \
612 "Print methods that are being rewritten") \
613 \
614 product(bool, UseInlineCaches, true, \
615 "Use Inline Caches for virtual calls ") \
616 \
617 develop(bool, InlineArrayCopy, true, \
618 "Inline arraycopy native that is known to be part of " \
619 "base library DLL") \
620 \
621 develop(bool, InlineObjectHash, true, \
622 "Inline Object::hashCode() native that is known to be part " \
623 "of base library DLL") \
624 \
625 develop(bool, InlineNatives, true, \
626 "Inline natives that are known to be part of base library DLL") \
627 \
628 develop(bool, InlineMathNatives, true, \
629 "Inline SinD, CosD, etc.") \
630 \
631 develop(bool, InlineClassNatives, true, \
632 "Inline Class.isInstance, etc") \
633 \
634 develop(bool, InlineThreadNatives, true, \
635 "Inline Thread.currentThread, etc") \
636 \
637 develop(bool, InlineUnsafeOps, true, \
638 "Inline memory ops (native methods) from sun.misc.Unsafe") \
639 \
640 product(bool, CriticalJNINatives, true, \
641 "Check for critical JNI entry points") \
642 \
643 notproduct(bool, StressCriticalJNINatives, false, \
644 "Exercise register saving code in critical natives") \
645 \
646 product(bool, UseSSE42Intrinsics, false, \
647 "SSE4.2 versions of intrinsics") \
648 \
649 product(bool, UseAESIntrinsics, false, \
650 "Use intrinsics for AES versions of crypto") \
651 \
652 product(bool, UseCRC32Intrinsics, false, \
653 "use intrinsics for java.util.zip.CRC32") \
654 \
655 develop(bool, TraceCallFixup, false, \
656 "Trace all call fixups") \
657 \
658 develop(bool, DeoptimizeALot, false, \
659 "Deoptimize at every exit from the runtime system") \
660 \
661 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
662 "A comma separated list of bcis to deoptimize at") \
663 \
664 product(bool, DeoptimizeRandom, false, \
665 "Deoptimize random frames on random exit from the runtime system")\
666 \
667 notproduct(bool, ZombieALot, false, \
668 "Create zombies (non-entrant) at exit from the runtime system") \
669 \
670 product(bool, UnlinkSymbolsALot, false, \
671 "Unlink unreferenced symbols from the symbol table at safepoints")\
672 \
673 notproduct(bool, WalkStackALot, false, \
674 "Trace stack (no print) at every exit from the runtime system") \
675 \
676 product(bool, Debugging, false, \
677 "Set when executing debug methods in debug.cpp " \
678 "(to prevent triggering assertions)") \
679 \
680 notproduct(bool, StrictSafepointChecks, trueInDebug, \
681 "Enable strict checks that safepoints cannot happen for threads " \
682 "that use No_Safepoint_Verifier") \
683 \
684 notproduct(bool, VerifyLastFrame, false, \
685 "Verify oops on last frame on entry to VM") \
686 \
687 develop(bool, TraceHandleAllocation, false, \
688 "Print out warnings when suspiciously many handles are allocated")\
689 \
690 product(bool, UseCompilerSafepoints, true, \
691 "Stop at safepoints in compiled code") \
692 \
693 product(bool, FailOverToOldVerifier, true, \
694 "Fail over to old verifier when split verifier fails") \
695 \
696 develop(bool, ShowSafepointMsgs, false, \
697 "Show message about safepoint synchronization") \
698 \
699 product(bool, SafepointTimeout, false, \
700 "Time out and warn or fail after SafepointTimeoutDelay " \
701 "milliseconds if failed to reach safepoint") \
702 \
703 develop(bool, DieOnSafepointTimeout, false, \
704 "Die upon failure to reach safepoint (see SafepointTimeout)") \
705 \
706 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
707 /* typically, at most a few retries are needed */ \
708 product(intx, SuspendRetryCount, 50, \
709 "Maximum retry count for an external suspend request") \
710 \
711 product(intx, SuspendRetryDelay, 5, \
712 "Milliseconds to delay per retry (* current_retry_count)") \
713 \
714 product(bool, AssertOnSuspendWaitFailure, false, \
715 "Assert/Guarantee on external suspend wait failure") \
716 \
717 product(bool, TraceSuspendWaitFailures, false, \
718 "Trace external suspend wait failures") \
719 \
720 product(bool, MaxFDLimit, true, \
721 "Bump the number of file descriptors to maximum in Solaris") \
722 \
723 diagnostic(bool, LogEvents, true, \
724 "Enable the various ring buffer event logs") \
725 \
726 diagnostic(uintx, LogEventsBufferEntries, 10, \
727 "Number of ring buffer event logs") \
728 \
729 product(bool, BytecodeVerificationRemote, true, \
730 "Enable the Java bytecode verifier for remote classes") \
731 \
732 product(bool, BytecodeVerificationLocal, false, \
733 "Enable the Java bytecode verifier for local classes") \
734 \
735 develop(bool, ForceFloatExceptions, trueInDebug, \
736 "Force exceptions on FP stack under/overflow") \
737 \
738 develop(bool, VerifyStackAtCalls, false, \
739 "Verify that the stack pointer is unchanged after calls") \
740 \
741 develop(bool, TraceJavaAssertions, false, \
742 "Trace java language assertions") \
743 \
744 notproduct(bool, CheckAssertionStatusDirectives, false, \
745 "Temporary - see javaClasses.cpp") \
746 \
747 notproduct(bool, PrintMallocFree, false, \
748 "Trace calls to C heap malloc/free allocation") \
749 \
750 product(bool, PrintOopAddress, false, \
751 "Always print the location of the oop") \
752 \
753 notproduct(bool, VerifyCodeCacheOften, false, \
754 "Verify compiled-code cache often") \
755 \
756 develop(bool, ZapDeadCompiledLocals, false, \
757 "Zap dead locals in compiler frames") \
758 \
759 notproduct(bool, ZapDeadLocalsOld, false, \
760 "Zap dead locals (old version, zaps all frames when " \
761 "entering the VM") \
762 \
763 notproduct(bool, CheckOopishValues, false, \
764 "Warn if value contains oop (requires ZapDeadLocals)") \
765 \
766 develop(bool, UseMallocOnly, false, \
767 "Use only malloc/free for allocation (no resource area/arena)") \
768 \
769 develop(bool, PrintMalloc, false, \
770 "Print all malloc/free calls") \
771 \
772 develop(bool, PrintMallocStatistics, false, \
773 "Print malloc/free statistics") \
774 \
775 develop(bool, ZapResourceArea, trueInDebug, \
776 "Zap freed resource/arena space with 0xABABABAB") \
777 \
778 notproduct(bool, ZapVMHandleArea, trueInDebug, \
779 "Zap freed VM handle space with 0xBCBCBCBC") \
780 \
781 develop(bool, ZapJNIHandleArea, trueInDebug, \
782 "Zap freed JNI handle space with 0xFEFEFEFE") \
783 \
784 notproduct(bool, ZapStackSegments, trueInDebug, \
785 "Zap allocated/freed stack segments with 0xFADFADED") \
786 \
787 develop(bool, ZapUnusedHeapArea, trueInDebug, \
788 "Zap unused heap space with 0xBAADBABE") \
789 \
790 develop(bool, TraceZapUnusedHeapArea, false, \
791 "Trace zapping of unused heap space") \
792 \
793 develop(bool, CheckZapUnusedHeapArea, false, \
794 "Check zapping of unused heap space") \
795 \
796 develop(bool, ZapFillerObjects, trueInDebug, \
797 "Zap filler objects with 0xDEAFBABE") \
798 \
799 develop(bool, PrintVMMessages, true, \
800 "Print VM messages on console") \
801 \
802 product(bool, PrintGCApplicationConcurrentTime, false, \
803 "Print the time the application has been running") \
804 \
805 product(bool, PrintGCApplicationStoppedTime, false, \
806 "Print the time the application has been stopped") \
807 \
808 diagnostic(bool, VerboseVerification, false, \
809 "Display detailed verification details") \
810 \
811 notproduct(uintx, ErrorHandlerTest, 0, \
812 "If > 0, provokes an error after VM initialization; the value " \
813 "determines which error to provoke. See test_error_handler() " \
814 "in debug.cpp.") \
815 \
816 develop(bool, Verbose, false, \
817 "Print additional debugging information from other modes") \
818 \
819 develop(bool, PrintMiscellaneous, false, \
820 "Print uncategorized debugging information (requires +Verbose)") \
821 \
822 develop(bool, WizardMode, false, \
823 "Print much more debugging information") \
824 \
825 product(bool, ShowMessageBoxOnError, false, \
826 "Keep process alive on VM fatal error") \
827 \
828 product(bool, CreateMinidumpOnCrash, false, \
829 "Create minidump on VM fatal error") \
830 \
831 product_pd(bool, UseOSErrorReporting, \
832 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
833 \
834 product(bool, SuppressFatalErrorMessage, false, \
835 "Report NO fatal error message (avoid deadlock)") \
836 \
837 product(ccstrlist, OnError, "", \
838 "Run user-defined commands on fatal error; see VMError.cpp " \
839 "for examples") \
840 \
841 product(ccstrlist, OnOutOfMemoryError, "", \
842 "Run user-defined commands on first java.lang.OutOfMemoryError") \
843 \
844 manageable(bool, HeapDumpBeforeFullGC, false, \
845 "Dump heap to file before any major stop-the-world GC") \
846 \
847 manageable(bool, HeapDumpAfterFullGC, false, \
848 "Dump heap to file after any major stop-the-world GC") \
849 \
850 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
851 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
852 \
853 manageable(ccstr, HeapDumpPath, NULL, \
854 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
855 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
856 "in the working directory)") \
857 \
858 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
859 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
860 "when the heap usage is larger than this") \
861 \
862 develop(uintx, HeapDumpSegmentSize, 1*G, \
863 "Approximate segment size when generating a segmented heap dump") \
864 \
865 develop(bool, BreakAtWarning, false, \
866 "Execute breakpoint upon encountering VM warning") \
867 \
868 develop(bool, TraceVMOperation, false, \
869 "Trace VM operations") \
870 \
871 develop(bool, UseFakeTimers, false, \
872 "Tell whether the VM should use system time or a fake timer") \
873 \
874 product(ccstr, NativeMemoryTracking, "off", \
875 "Native memory tracking options") \
876 \
877 diagnostic(bool, PrintNMTStatistics, false, \
878 "Print native memory tracking summary data if it is on") \
879 \
880 diagnostic(bool, AutoShutdownNMT, true, \
881 "Automatically shutdown native memory tracking under stress " \
882 "situations. When set to false, native memory tracking tries to " \
883 "stay alive at the expense of JVM performance") \
884 \
885 diagnostic(bool, LogCompilation, false, \
886 "Log compilation activity in detail to LogFile") \
887 \
888 product(bool, PrintCompilation, false, \
889 "Print compilations") \
890 \
891 diagnostic(bool, TraceNMethodInstalls, false, \
892 "Trace nmethod installation") \
893 \
894 diagnostic(intx, ScavengeRootsInCode, 2, \
895 "0: do not allow scavengable oops in the code cache; " \
896 "1: allow scavenging from the code cache; " \
897 "2: emit as many constants as the compiler can see") \
898 \
899 product(bool, AlwaysRestoreFPU, false, \
900 "Restore the FPU control word after every JNI call (expensive)") \
901 \
902 diagnostic(bool, PrintCompilation2, false, \
903 "Print additional statistics per compilation") \
904 \
905 diagnostic(bool, PrintAdapterHandlers, false, \
906 "Print code generated for i2c/c2i adapters") \
907 \
908 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
909 "Verify that i2c/c2i adapters are called properly") \
910 \
911 develop(bool, VerifyAdapterSharing, false, \
912 "Verify that the code for shared adapters is the equivalent") \
913 \
914 diagnostic(bool, PrintAssembly, false, \
915 "Print assembly code (using external disassembler.so)") \
916 \
917 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
918 "Print options string passed to disassembler.so") \
919 \
920 diagnostic(bool, PrintNMethods, false, \
921 "Print assembly code for nmethods when generated") \
922 \
923 diagnostic(bool, PrintNativeNMethods, false, \
924 "Print assembly code for native nmethods when generated") \
925 \
926 develop(bool, PrintDebugInfo, false, \
927 "Print debug information for all nmethods when generated") \
928 \
929 develop(bool, PrintRelocations, false, \
930 "Print relocation information for all nmethods when generated") \
931 \
932 develop(bool, PrintDependencies, false, \
933 "Print dependency information for all nmethods when generated") \
934 \
935 develop(bool, PrintExceptionHandlers, false, \
936 "Print exception handler tables for all nmethods when generated") \
937 \
938 develop(bool, StressCompiledExceptionHandlers, false, \
939 "Exercise compiled exception handlers") \
940 \
941 develop(bool, InterceptOSException, false, \
942 "Start debugger when an implicit OS (e.g. NULL) " \
943 "exception happens") \
944 \
945 product(bool, PrintCodeCache, false, \
946 "Print the code cache memory usage when exiting") \
947 \
948 develop(bool, PrintCodeCache2, false, \
949 "Print detailed usage information on the code cache when exiting")\
950 \
951 product(bool, PrintCodeCacheOnCompilation, false, \
952 "Print the code cache memory usage each time a method is " \
953 "compiled") \
954 \
955 diagnostic(bool, PrintStubCode, false, \
956 "Print generated stub code") \
957 \
958 product(bool, StackTraceInThrowable, true, \
959 "Collect backtrace in throwable when exception happens") \
960 \
961 product(bool, OmitStackTraceInFastThrow, true, \
962 "Omit backtraces for some 'hot' exceptions in optimized code") \
963 \
964 product(bool, ProfilerPrintByteCodeStatistics, false, \
965 "Print bytecode statistics when dumping profiler output") \
966 \
967 product(bool, ProfilerRecordPC, false, \
968 "Collect ticks for each 16 byte interval of compiled code") \
969 \
970 product(bool, ProfileVM, false, \
971 "Profile ticks that fall within VM (either in the VM Thread " \
972 "or VM code called through stubs)") \
973 \
974 product(bool, ProfileIntervals, false, \
975 "Print profiles for each interval (see ProfileIntervalsTicks)") \
976 \
977 notproduct(bool, ProfilerCheckIntervals, false, \
978 "Collect and print information on spacing of profiler ticks") \
979 \
980 develop(bool, PrintJVMWarnings, false, \
981 "Print warnings for unimplemented JVM functions") \
982 \
983 product(bool, PrintWarnings, true, \
984 "Print JVM warnings to output stream") \
985 \
986 notproduct(uintx, WarnOnStalledSpinLock, 0, \
987 "Print warnings for stalled SpinLocks") \
988 \
989 product(bool, RegisterFinalizersAtInit, true, \
990 "Register finalizable objects at end of Object.<init> or " \
991 "after allocation") \
992 \
993 develop(bool, RegisterReferences, true, \
994 "Tell whether the VM should register soft/weak/final/phantom " \
995 "references") \
996 \
997 develop(bool, IgnoreRewrites, false, \
998 "Suppress rewrites of bytecodes in the oopmap generator. " \
999 "This is unsafe!") \
1000 \
1001 develop(bool, PrintCodeCacheExtension, false, \
1002 "Print extension of code cache") \
1003 \
1004 develop(bool, UsePrivilegedStack, true, \
1005 "Enable the security JVM functions") \
1006 \
1007 develop(bool, ProtectionDomainVerification, true, \
1008 "Verify protection domain before resolution in system dictionary")\
1009 \
1010 product(bool, ClassUnloading, true, \
1011 "Do unloading of classes") \
1012 \
1013 develop(bool, DisableStartThread, false, \
1014 "Disable starting of additional Java threads " \
1015 "(for debugging only)") \
1016 \
1017 develop(bool, MemProfiling, false, \
1018 "Write memory usage profiling to log file") \
1019 \
1020 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1021 "Print the system dictionary at exit") \
1022 \
1023 experimental(intx, PredictedLoadedClassCount, 0, \
1024 "Experimental: Tune loaded class cache starting size") \
1025 \
1026 diagnostic(bool, UnsyncloadClass, false, \
1027 "Unstable: VM calls loadClass unsynchronized. Custom " \
1028 "class loader must call VM synchronized for findClass " \
1029 "and defineClass.") \
1030 \
1031 product(bool, AlwaysLockClassLoader, false, \
1032 "Require the VM to acquire the class loader lock before calling " \
1033 "loadClass() even for class loaders registering " \
1034 "as parallel capable") \
1035 \
1036 product(bool, AllowParallelDefineClass, false, \
1037 "Allow parallel defineClass requests for class loaders " \
1038 "registering as parallel capable") \
1039 \
1040 product(bool, MustCallLoadClassInternal, false, \
1041 "Call loadClassInternal() rather than loadClass()") \
1042 \
1043 product_pd(bool, DontYieldALot, \
1044 "Throw away obvious excess yield calls (for Solaris only)") \
1045 \
1046 product_pd(bool, ConvertSleepToYield, \
1047 "Convert sleep(0) to thread yield " \
1048 "(may be off for Solaris to improve GUI)") \
1049 \
1050 product(bool, ConvertYieldToSleep, false, \
1051 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1052 "behavior (Solaris only)") \
1053 \
1054 product(bool, UseBoundThreads, true, \
1055 "Bind user level threads to kernel threads (for Solaris only)") \
1056 \
1057 develop(bool, UseDetachedThreads, true, \
1058 "Use detached threads that are recycled upon termination " \
1059 "(for Solaris only)") \
1060 \
1061 product(bool, UseLWPSynchronization, true, \
1062 "Use LWP-based instead of libthread-based synchronization " \
1063 "(SPARC only)") \
1064 \
1065 product(ccstr, SyncKnobs, NULL, \
1066 "(Unstable) Various monitor synchronization tunables") \
1067 \
1068 product(intx, EmitSync, 0, \
1069 "(Unsafe, Unstable) " \
1070 "Control emission of inline sync fast-path code") \
1071 \
1072 product(intx, MonitorBound, 0, "Bound Monitor population") \
1073 \
1074 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1075 \
1076 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1077 \
1078 product(intx, SyncVerbose, 0, "(Unstable)") \
1079 \
1080 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1081 \
1082 product(intx, hashCode, 5, \
1083 "(Unstable) select hashCode generation algorithm") \
1084 \
1085 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1086 "(Unstable, Linux-specific) " \
1087 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1088 \
1089 product(bool, FilterSpuriousWakeups, true, \
1090 "Prevent spurious or premature wakeups from object.wait " \
1091 "(Solaris only)") \
1092 \
1093 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1094 \
1095 product(intx, NativeMonitorFlags, 0, "(Unstable)") \
1096 \
1097 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1098 \
1099 develop(bool, UsePthreads, false, \
1100 "Use pthread-based instead of libthread-based synchronization " \
1101 "(SPARC only)") \
1102 \
1103 product(bool, AdjustConcurrency, false, \
1104 "Call thr_setconcurrency at thread creation time to avoid " \
1105 "LWP starvation on MP systems (for Solaris Only)") \
1106 \
1107 product(bool, ReduceSignalUsage, false, \
1108 "Reduce the use of OS signals in Java and/or the VM") \
1109 \
1110 develop_pd(bool, ShareVtableStubs, \
1111 "Share vtable stubs (smaller code but worse branch prediction") \
1112 \
1113 develop(bool, LoadLineNumberTables, true, \
1114 "Tell whether the class file parser loads line number tables") \
1115 \
1116 develop(bool, LoadLocalVariableTables, true, \
1117 "Tell whether the class file parser loads local variable tables") \
1118 \
1119 develop(bool, LoadLocalVariableTypeTables, true, \
1120 "Tell whether the class file parser loads local variable type" \
1121 "tables") \
1122 \
1123 product(bool, AllowUserSignalHandlers, false, \
1124 "Do not complain if the application installs signal handlers " \
1125 "(Solaris & Linux only)") \
1126 \
1127 product(bool, UseSignalChaining, true, \
1128 "Use signal-chaining to invoke signal handlers installed " \
1129 "by the application (Solaris & Linux only)") \
1130 \
1131 product(bool, UseAltSigs, false, \
1132 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1133 "internal signals (Solaris only)") \
1134 \
1135 product(bool, AllowJNIEnvProxy, false, \
1136 "Allow JNIEnv proxies for jdbx") \
1137 \
1138 product(bool, JNIDetachReleasesMonitors, true, \
1139 "JNI DetachCurrentThread releases monitors owned by thread") \
1140 \
1141 product(bool, RestoreMXCSROnJNICalls, false, \
1142 "Restore MXCSR when returning from JNI calls") \
1143 \
1144 product(bool, CheckJNICalls, false, \
1145 "Verify all arguments to JNI calls") \
1146 \
1147 product(bool, UseFastJNIAccessors, true, \
1148 "Use optimized versions of Get<Primitive>Field") \
1149 \
1150 product(bool, EagerXrunInit, false, \
1151 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1152 "but not all -Xrun libraries may support the state of the VM " \
1153 "at this time") \
1154 \
1155 product(bool, PreserveAllAnnotations, false, \
1156 "Preserve RuntimeInvisibleAnnotations as well " \
1157 "as RuntimeVisibleAnnotations") \
1158 \
1159 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1160 "Number of OutOfMemoryErrors preallocated with backtrace") \
1161 \
1162 product(bool, LazyBootClassLoader, true, \
1163 "Enable/disable lazy opening of boot class path entries") \
1164 \
1165 product(bool, UseXMMForArrayCopy, false, \
1166 "Use SSE2 MOVQ instruction for Arraycopy") \
1167 \
1168 product(intx, FieldsAllocationStyle, 1, \
1169 "0 - type based with oops first, 1 - with oops last, " \
1170 "2 - oops in super and sub classes are together") \
1171 \
1172 product(bool, CompactFields, true, \
1173 "Allocate nonstatic fields in gaps between previous fields") \
1174 \
1175 notproduct(bool, PrintFieldLayout, false, \
1176 "Print field layout for each class") \
1177 \
1178 product(intx, ContendedPaddingWidth, 128, \
1179 "How many bytes to pad the fields/classes marked @Contended with")\
1180 \
1181 product(bool, EnableContended, true, \
1182 "Enable @Contended annotation support") \
1183 \
1184 product(bool, RestrictContended, true, \
1185 "Restrict @Contended to trusted classes") \
1186 \
1187 product(bool, UseBiasedLocking, true, \
1188 "Enable biased locking in JVM") \
1189 \
1190 product(intx, BiasedLockingStartupDelay, 4000, \
1191 "Number of milliseconds to wait before enabling biased locking") \
1192 \
1193 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1194 "Print statistics of biased locking in JVM") \
1195 \
1196 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1197 "Threshold of number of revocations per type to try to " \
1198 "rebias all objects in the heap of that type") \
1199 \
1200 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1201 "Threshold of number of revocations per type to permanently " \
1202 "revoke biases of all objects in the heap of that type") \
1203 \
1204 product(intx, BiasedLockingDecayTime, 25000, \
1205 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1206 "type after previous bulk rebias") \
1207 \
1208 /* tracing */ \
1209 \
1210 notproduct(bool, TraceRuntimeCalls, false, \
1211 "Trace run-time calls") \
1212 \
1213 develop(bool, TraceJNICalls, false, \
1214 "Trace JNI calls") \
1215 \
1216 notproduct(bool, TraceJVMCalls, false, \
1217 "Trace JVM calls") \
1218 \
1219 product(ccstr, TraceJVMTI, NULL, \
1220 "Trace flags for JVMTI functions and events") \
1221 \
1222 /* This option can change an EMCP method into an obsolete method. */ \
1223 /* This can affect tests that except specific methods to be EMCP. */ \
1224 /* This option should be used with caution. */ \
1225 product(bool, StressLdcRewrite, false, \
1226 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1227 \
1228 product(intx, TraceRedefineClasses, 0, \
1229 "Trace level for JVMTI RedefineClasses") \
1230 \
1231 develop(bool, StressMethodComparator, false, \
1232 "Run the MethodComparator on all loaded methods") \
1233 \
1234 /* change to false by default sometime after Mustang */ \
1235 product(bool, VerifyMergedCPBytecodes, true, \
1236 "Verify bytecodes after RedefineClasses constant pool merging") \
1237 \
1238 develop(bool, TraceJNIHandleAllocation, false, \
1239 "Trace allocation/deallocation of JNI handle blocks") \
1240 \
1241 develop(bool, TraceThreadEvents, false, \
1242 "Trace all thread events") \
1243 \
1244 develop(bool, TraceBytecodes, false, \
1245 "Trace bytecode execution") \
1246 \
1247 develop(bool, TraceClassInitialization, false, \
1248 "Trace class initialization") \
1249 \
1250 develop(bool, TraceExceptions, false, \
1251 "Trace exceptions") \
1252 \
1253 develop(bool, TraceICs, false, \
1254 "Trace inline cache changes") \
1255 \
1256 notproduct(bool, TraceInvocationCounterOverflow, false, \
1257 "Trace method invocation counter overflow") \
1258 \
1259 develop(bool, TraceInlineCacheClearing, false, \
1260 "Trace clearing of inline caches in nmethods") \
1261 \
1262 develop(bool, TraceDependencies, false, \
1263 "Trace dependencies") \
1264 \
1265 develop(bool, VerifyDependencies, trueInDebug, \
1266 "Exercise and verify the compilation dependency mechanism") \
1267 \
1268 develop(bool, TraceNewOopMapGeneration, false, \
1269 "Trace OopMapGeneration") \
1270 \
1271 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1272 "Trace OopMapGeneration: print detailed cell states") \
1273 \
1274 develop(bool, TimeOopMap, false, \
1275 "Time calls to GenerateOopMap::compute_map() in sum") \
1276 \
1277 develop(bool, TimeOopMap2, false, \
1278 "Time calls to GenerateOopMap::compute_map() individually") \
1279 \
1280 develop(bool, TraceMonitorMismatch, false, \
1281 "Trace monitor matching failures during OopMapGeneration") \
1282 \
1283 develop(bool, TraceOopMapRewrites, false, \
1284 "Trace rewriting of method oops during oop map generation") \
1285 \
1286 develop(bool, TraceSafepoint, false, \
1287 "Trace safepoint operations") \
1288 \
1289 develop(bool, TraceICBuffer, false, \
1290 "Trace usage of IC buffer") \
1291 \
1292 develop(bool, TraceCompiledIC, false, \
1293 "Trace changes of compiled IC") \
1294 \
1295 notproduct(bool, TraceZapDeadLocals, false, \
1296 "Trace zapping dead locals") \
1297 \
1298 develop(bool, TraceStartupTime, false, \
1299 "Trace setup time") \
1300 \
1301 develop(bool, TraceProtectionDomainVerification, false, \
1302 "Trace protection domain verification") \
1303 \
1304 develop(bool, TraceClearedExceptions, false, \
1305 "Print when an exception is forcibly cleared") \
1306 \
1307 product(bool, TraceClassResolution, false, \
1308 "Trace all constant pool resolutions (for debugging)") \
1309 \
1310 product(bool, TraceBiasedLocking, false, \
1311 "Trace biased locking in JVM") \
1312 \
1313 product(bool, TraceMonitorInflation, false, \
1314 "Trace monitor inflation in JVM") \
1315 \
1316 /* gc */ \
1317 \
1318 product(bool, UseSerialGC, false, \
1319 "Use the Serial garbage collector") \
1320 \
1321 product(bool, UseG1GC, false, \
1322 "Use the Garbage-First garbage collector") \
1323 \
1324 product(bool, UseParallelGC, false, \
1325 "Use the Parallel Scavenge garbage collector") \
1326 \
1327 product(bool, UseParallelOldGC, false, \
1328 "Use the Parallel Old garbage collector") \
1329 \
1330 product(uintx, HeapMaximumCompactionInterval, 20, \
1331 "How often should we maximally compact the heap (not allowing " \
1332 "any dead space)") \
1333 \
1334 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1335 "The collection count for the first maximum compaction") \
1336 \
1337 product(bool, UseMaximumCompactionOnSystemGC, true, \
1338 "Use maximum compaction in the Parallel Old garbage collector " \
1339 "for a system GC") \
1340 \
1341 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1342 "The mean used by the parallel compact dead wood " \
1343 "limiter (a number between 0-100)") \
1344 \
1345 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1346 "The standard deviation used by the parallel compact dead wood " \
1347 "limiter (a number between 0-100)") \
1348 \
1349 product(uintx, ParallelGCThreads, 0, \
1350 "Number of parallel threads parallel gc will use") \
1351 \
1352 product(bool, UseDynamicNumberOfGCThreads, false, \
1353 "Dynamically choose the number of parallel threads " \
1354 "parallel gc will use") \
1355 \
1356 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1357 "Force dynamic selection of the number of " \
1358 "parallel threads parallel gc will use to aid debugging") \
1359 \
1360 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1361 "Size of heap (bytes) per GC thread used in calculating the " \
1362 "number of GC threads") \
1363 \
1364 product(bool, TraceDynamicGCThreads, false, \
1365 "Trace the dynamic GC thread usage") \
1366 \
1367 develop(bool, ParallelOldGCSplitALot, false, \
1368 "Provoke splitting (copying data from a young gen space to " \
1369 "multiple destination spaces)") \
1370 \
1371 develop(uintx, ParallelOldGCSplitInterval, 3, \
1372 "How often to provoke splitting a young gen space") \
1373 \
1374 product(uintx, ConcGCThreads, 0, \
1375 "Number of threads concurrent gc will use") \
1376 \
1377 product(uintx, YoungPLABSize, 4096, \
1378 "Size of young gen promotion LAB's (in HeapWords)") \
1379 \
1380 product(uintx, OldPLABSize, 1024, \
1381 "Size of old gen promotion LAB's (in HeapWords)") \
1382 \
1383 product(uintx, GCTaskTimeStampEntries, 200, \
1384 "Number of time stamp entries per gc worker thread") \
1385 \
1386 product(bool, AlwaysTenure, false, \
1387 "Always tenure objects in eden (ParallelGC only)") \
1388 \
1389 product(bool, NeverTenure, false, \
1390 "Never tenure objects in eden, may tenure on overflow " \
1391 "(ParallelGC only)") \
1392 \
1393 product(bool, ScavengeBeforeFullGC, true, \
1394 "Scavenge youngest generation before each full GC, " \
1395 "used with UseParallelGC") \
1396 \
1397 develop(bool, ScavengeWithObjectsInToSpace, false, \
1398 "Allow scavenges to occur when to-space contains objects") \
1399 \
1400 product(bool, UseConcMarkSweepGC, false, \
1401 "Use Concurrent Mark-Sweep GC in the old generation") \
1402 \
1403 product(bool, ExplicitGCInvokesConcurrent, false, \
1404 "A System.gc() request invokes a concurrent collection; " \
1405 "(effective only when UseConcMarkSweepGC)") \
1406 \
1407 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1408 "A System.gc() request invokes a concurrent collection and " \
1409 "also unloads classes during such a concurrent gc cycle " \
1410 "(effective only when UseConcMarkSweepGC)") \
1411 \
1412 product(bool, GCLockerInvokesConcurrent, false, \
1413 "The exit of a JNI critical section necessitating a scavenge, " \
1414 "also kicks off a background concurrent collection") \
1415 \
1416 product(uintx, GCLockerEdenExpansionPercent, 5, \
1417 "How much the GC can expand the eden by while the GC locker " \
1418 "is active (as a percentage)") \
1419 \
1420 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1421 "Number of times to retry allocations when " \
1422 "blocked by the GC locker") \
1423 \
1424 develop(bool, UseCMSAdaptiveFreeLists, true, \
1425 "Use adaptive free lists in the CMS generation") \
1426 \
1427 develop(bool, UseAsyncConcMarkSweepGC, true, \
1428 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1429 \
1430 develop(bool, RotateCMSCollectionTypes, false, \
1431 "Rotate the CMS collections among concurrent and STW") \
1432 \
1433 product(bool, UseCMSBestFit, true, \
1434 "Use CMS best fit allocation strategy") \
1435 \
1436 product(bool, UseCMSCollectionPassing, true, \
1437 "Use passing of collection from background to foreground") \
1438 \
1439 product(bool, UseParNewGC, false, \
1440 "Use parallel threads in the new generation") \
1441 \
1442 product(bool, ParallelGCVerbose, false, \
1443 "Verbose output for parallel gc") \
1444 \
1445 product(uintx, ParallelGCBufferWastePct, 10, \
1446 "Wasted fraction of parallel allocation buffer") \
1447 \
1448 diagnostic(bool, ParallelGCRetainPLAB, false, \
1449 "Retain parallel allocation buffers across scavenges; " \
1450 "it is disabled because this currently conflicts with " \
1451 "parallel card scanning under certain conditions.") \
1452 \
1453 product(uintx, TargetPLABWastePct, 10, \
1454 "Target wasted space in last buffer as percent of overall " \
1455 "allocation") \
1456 \
1457 product(uintx, PLABWeight, 75, \
1458 "Percentage (0-100) used to weigh the current sample when " \
1459 "computing exponentially decaying average for ResizePLAB") \
1460 \
1461 product(bool, ResizePLAB, true, \
1462 "Dynamically resize (survivor space) promotion LAB's") \
1463 \
1464 product(bool, PrintPLAB, false, \
1465 "Print (survivor space) promotion LAB's sizing decisions") \
1466 \
1467 product(intx, ParGCArrayScanChunk, 50, \
1468 "Scan a subset of object array and push remainder, if array is " \
1469 "bigger than this") \
1470 \
1471 product(bool, ParGCUseLocalOverflow, false, \
1472 "Instead of a global overflow list, use local overflow stacks") \
1473 \
1474 product(bool, ParGCTrimOverflow, true, \
1475 "Eagerly trim the local overflow lists " \
1476 "(when ParGCUseLocalOverflow)") \
1477 \
1478 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1479 "Simulate work queue overflow in ParNew") \
1480 \
1481 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1482 "An `interval' counter that determines how frequently " \
1483 "we simulate overflow; a smaller number increases frequency") \
1484 \
1485 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1486 "The desired number of objects to claim from the overflow list") \
1487 \
1488 diagnostic(uintx, ParGCStridesPerThread, 2, \
1489 "The number of strides per worker thread that we divide up the " \
1490 "card table scanning work into") \
1491 \
1492 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1493 "The number of cards in each chunk of the parallel chunks used " \
1494 "during card table scanning") \
1495 \
1496 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1497 "Number of blocks to attempt to claim when refilling CMS LAB's " \
1498 "for parallel GC") \
1499 \
1500 product(uintx, OldPLABWeight, 50, \
1501 "Percentage (0-100) used to weight the current sample when " \
1502 "computing exponentially decaying average for resizing " \
1503 "CMSParPromoteBlocksToClaim") \
1504 \
1505 product(bool, ResizeOldPLAB, true, \
1506 "Dynamically resize (old gen) promotion LAB's") \
1507 \
1508 product(bool, PrintOldPLAB, false, \
1509 "Print (old gen) promotion LAB's sizing decisions") \
1510 \
1511 product(uintx, CMSOldPLABMin, 16, \
1512 "Minimum size of CMS gen promotion LAB caches per worker " \
1513 "per block size") \
1514 \
1515 product(uintx, CMSOldPLABMax, 1024, \
1516 "Maximum size of CMS gen promotion LAB caches per worker " \
1517 "per block size") \
1518 \
1519 product(uintx, CMSOldPLABNumRefills, 4, \
1520 "Nominal number of refills of CMS gen promotion LAB cache " \
1521 "per worker per block size") \
1522 \
1523 product(bool, CMSOldPLABResizeQuicker, false, \
1524 "React on-the-fly during a scavenge to a sudden " \
1525 "change in block demand rate") \
1526 \
1527 product(uintx, CMSOldPLABToleranceFactor, 4, \
1528 "The tolerance of the phase-change detector for on-the-fly " \
1529 "PLAB resizing during a scavenge") \
1530 \
1531 product(uintx, CMSOldPLABReactivityFactor, 2, \
1532 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1533 "during a scavenge") \
1534 \
1535 product(bool, AlwaysPreTouch, false, \
1536 "Force all freshly committed pages to be pre-touched") \
1537 \
1538 product_pd(uintx, CMSYoungGenPerWorker, \
1539 "The maximum size of young gen chosen by default per GC worker " \
1540 "thread available") \
1541 \
1542 product(bool, CMSIncrementalMode, false, \
1543 "Whether CMS GC should operate in \"incremental\" mode") \
1544 \
1545 product(uintx, CMSIncrementalDutyCycle, 10, \
1546 "Percentage (0-100) of CMS incremental mode duty cycle. If " \
1547 "CMSIncrementalPacing is enabled, then this is just the initial " \
1548 "value.") \
1549 \
1550 product(bool, CMSIncrementalPacing, true, \
1551 "Whether the CMS incremental mode duty cycle should be " \
1552 "automatically adjusted") \
1553 \
1554 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1555 "Minimum percentage (0-100) of the CMS incremental duty cycle " \
1556 "used when CMSIncrementalPacing is enabled") \
1557 \
1558 product(uintx, CMSIncrementalSafetyFactor, 10, \
1559 "Percentage (0-100) used to add conservatism when computing the " \
1560 "duty cycle") \
1561 \
1562 product(uintx, CMSIncrementalOffset, 0, \
1563 "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1564 "is shifted to the right within the period between young GCs") \
1565 \
1566 product(uintx, CMSExpAvgFactor, 50, \
1567 "Percentage (0-100) used to weigh the current sample when " \
1568 "computing exponential averages for CMS statistics") \
1569 \
1570 product(uintx, CMS_FLSWeight, 75, \
1571 "Percentage (0-100) used to weigh the current sample when " \
1572 "computing exponentially decaying averages for CMS FLS " \
1573 "statistics") \
1574 \
1575 product(uintx, CMS_FLSPadding, 1, \
1576 "The multiple of deviation from mean to use for buffering " \
1577 "against volatility in free list demand") \
1578 \
1579 product(uintx, FLSCoalescePolicy, 2, \
1580 "CMS: aggressiveness level for coalescing, increasing " \
1581 "from 0 to 4") \
1582 \
1583 product(bool, FLSAlwaysCoalesceLarge, false, \
1584 "CMS: larger free blocks are always available for coalescing") \
1585 \
1586 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1587 "CMS: the smaller the percentage the greater the coalescing " \
1588 "force") \
1589 \
1590 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1591 "CMS: the factor by which to inflate estimated demand of small " \
1592 "block sizes to prevent coalescing with an adjoining block") \
1593 \
1594 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1595 "CMS: the factor by which to inflate estimated demand of large " \
1596 "block sizes to prevent coalescing with an adjoining block") \
1597 \
1598 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1599 "CMS: the factor by which to inflate estimated demand of small " \
1600 "block sizes to prevent splitting to supply demand for smaller " \
1601 "blocks") \
1602 \
1603 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1604 "CMS: the factor by which to inflate estimated demand of large " \
1605 "block sizes to prevent splitting to supply demand for smaller " \
1606 "blocks") \
1607 \
1608 product(bool, CMSExtrapolateSweep, false, \
1609 "CMS: cushion for block demand during sweep") \
1610 \
1611 product(uintx, CMS_SweepWeight, 75, \
1612 "Percentage (0-100) used to weight the current sample when " \
1613 "computing exponentially decaying average for inter-sweep " \
1614 "duration") \
1615 \
1616 product(uintx, CMS_SweepPadding, 1, \
1617 "The multiple of deviation from mean to use for buffering " \
1618 "against volatility in inter-sweep duration") \
1619 \
1620 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1621 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1622 "duration exceeds this threshold in milliseconds") \
1623 \
1624 develop(bool, CMSTraceIncrementalMode, false, \
1625 "Trace CMS incremental mode") \
1626 \
1627 develop(bool, CMSTraceIncrementalPacing, false, \
1628 "Trace CMS incremental mode pacing computation") \
1629 \
1630 develop(bool, CMSTraceThreadState, false, \
1631 "Trace the CMS thread state (enable the trace_state() method)") \
1632 \
1633 product(bool, CMSClassUnloadingEnabled, true, \
1634 "Whether class unloading enabled when using CMS GC") \
1635 \
1636 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1637 "When CMS class unloading is enabled, the maximum CMS cycle " \
1638 "count for which classes may not be unloaded") \
1639 \
1640 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1641 "Compact when asked to collect CMS gen with " \
1642 "clear_all_soft_refs()") \
1643 \
1644 product(bool, UseCMSCompactAtFullCollection, true, \
1645 "Use Mark-Sweep-Compact algorithm at full collections") \
1646 \
1647 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1648 "Number of CMS full collection done before compaction if > 0") \
1649 \
1650 develop(intx, CMSDictionaryChoice, 0, \
1651 "Use BinaryTreeDictionary as default in the CMS generation") \
1652 \
1653 product(uintx, CMSIndexedFreeListReplenish, 4, \
1654 "Replenish an indexed free list with this number of chunks") \
1655 \
1656 product(bool, CMSReplenishIntermediate, true, \
1657 "Replenish all intermediate free-list caches") \
1658 \
1659 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1660 "When satisfying batched demand, split blocks from the " \
1661 "IndexedFreeList whose size is a multiple of requested size") \
1662 \
1663 product(bool, CMSLoopWarn, false, \
1664 "Warn in case of excessive CMS looping") \
1665 \
1666 develop(bool, CMSOverflowEarlyRestoration, false, \
1667 "Restore preserved marks early") \
1668 \
1669 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1670 "Size of marking stack") \
1671 \
1672 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1673 "Maximum size of marking stack") \
1674 \
1675 notproduct(bool, CMSMarkStackOverflowALot, false, \
1676 "Simulate frequent marking stack / work queue overflow") \
1677 \
1678 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1679 "An \"interval\" counter that determines how frequently " \
1680 "to simulate overflow; a smaller number increases frequency") \
1681 \
1682 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1683 "(Temporary, subject to experimentation) " \
1684 "Maximum number of abortable preclean iterations, if > 0") \
1685 \
1686 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1687 "(Temporary, subject to experimentation) " \
1688 "Maximum time in abortable preclean (in milliseconds)") \
1689 \
1690 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1691 "(Temporary, subject to experimentation) " \
1692 "Nominal minimum work per abortable preclean iteration") \
1693 \
1694 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1695 "(Temporary, subject to experimentation) " \
1696 "Time that we sleep between iterations when not given " \
1697 "enough work per iteration") \
1698 \
1699 product(uintx, CMSRescanMultiple, 32, \
1700 "Size (in cards) of CMS parallel rescan task") \
1701 \
1702 product(uintx, CMSConcMarkMultiple, 32, \
1703 "Size (in cards) of CMS concurrent MT marking task") \
1704 \
1705 product(bool, CMSAbortSemantics, false, \
1706 "Whether abort-on-overflow semantics is implemented") \
1707 \
1708 product(bool, CMSParallelInitialMarkEnabled, true, \
1709 "Use the parallel initial mark.") \
1710 \
1711 product(bool, CMSParallelRemarkEnabled, true, \
1712 "Whether parallel remark enabled (only if ParNewGC)") \
1713 \
1714 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1715 "Whether parallel remark of survivor space " \
1716 "enabled (effective only if CMSParallelRemarkEnabled)") \
1717 \
1718 product(bool, CMSPLABRecordAlways, true, \
1719 "Always record survivor space PLAB boundaries (effective only " \
1720 "if CMSParallelSurvivorRemarkEnabled)") \
1721 \
1722 product(bool, CMSEdenChunksRecordAlways, true, \
1723 "Always record eden chunks used for the parallel initial mark " \
1724 "or remark of eden") \
1725 \
1726 product(bool, CMSPrintEdenSurvivorChunks, false, \
1727 "Print the eden and the survivor chunks used for the parallel " \
1728 "initial mark or remark of the eden/survivor spaces") \
1729 \
1730 product(bool, CMSConcurrentMTEnabled, true, \
1731 "Whether multi-threaded concurrent work enabled " \
1732 "(effective only if ParNewGC)") \
1733 \
1734 product(bool, CMSPrecleaningEnabled, true, \
1735 "Whether concurrent precleaning enabled") \
1736 \
1737 product(uintx, CMSPrecleanIter, 3, \
1738 "Maximum number of precleaning iteration passes") \
1739 \
1740 product(uintx, CMSPrecleanNumerator, 2, \
1741 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1742 "ratio") \
1743 \
1744 product(uintx, CMSPrecleanDenominator, 3, \
1745 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1746 "ratio") \
1747 \
1748 product(bool, CMSPrecleanRefLists1, true, \
1749 "Preclean ref lists during (initial) preclean phase") \
1750 \
1751 product(bool, CMSPrecleanRefLists2, false, \
1752 "Preclean ref lists during abortable preclean phase") \
1753 \
1754 product(bool, CMSPrecleanSurvivors1, false, \
1755 "Preclean survivors during (initial) preclean phase") \
1756 \
1757 product(bool, CMSPrecleanSurvivors2, true, \
1758 "Preclean survivors during abortable preclean phase") \
1759 \
1760 product(uintx, CMSPrecleanThreshold, 1000, \
1761 "Do not iterate again if number of dirty cards is less than this")\
1762 \
1763 product(bool, CMSCleanOnEnter, true, \
1764 "Clean-on-enter optimization for reducing number of dirty cards") \
1765 \
1766 product(uintx, CMSRemarkVerifyVariant, 1, \
1767 "Choose variant (1,2) of verification following remark") \
1768 \
1769 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1770 "If Eden size is below this, do not try to schedule remark") \
1771 \
1772 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1773 "The Eden occupancy percentage (0-100) at which " \
1774 "to try and schedule remark pause") \
1775 \
1776 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1777 "Start sampling eden top at least before young gen " \
1778 "occupancy reaches 1/<ratio> of the size at which " \
1779 "we plan to schedule remark") \
1780 \
1781 product(uintx, CMSSamplingGrain, 16*K, \
1782 "The minimum distance between eden samples for CMS (see above)") \
1783 \
1784 product(bool, CMSScavengeBeforeRemark, false, \
1785 "Attempt scavenge before the CMS remark step") \
1786 \
1787 develop(bool, CMSTraceSweeper, false, \
1788 "Trace some actions of the CMS sweeper") \
1789 \
1790 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1791 "Don't drain below this size per parallel worker/thief") \
1792 \
1793 manageable(intx, CMSWaitDuration, 2000, \
1794 "Time in milliseconds that CMS thread waits for young GC") \
1795 \
1796 develop(uintx, CMSCheckInterval, 1000, \
1797 "Interval in milliseconds that CMS thread checks if it " \
1798 "should start a collection cycle") \
1799 \
1800 product(bool, CMSYield, true, \
1801 "Yield between steps of CMS") \
1802 \
1803 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1804 "Bitmap operations should process at most this many bits " \
1805 "between yields") \
1806 \
1807 product(bool, CMSDumpAtPromotionFailure, false, \
1808 "Dump useful information about the state of the CMS old " \
1809 "generation upon a promotion failure") \
1810 \
1811 product(bool, CMSPrintChunksInDump, false, \
1812 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1813 "more detailed information about the free chunks") \
1814 \
1815 product(bool, CMSPrintObjectsInDump, false, \
1816 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1817 "more detailed information about the allocated objects") \
1818 \
1819 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1820 "Verify that all references across the FLS boundary " \
1821 "are to valid objects") \
1822 \
1823 diagnostic(bool, FLSVerifyLists, false, \
1824 "Do lots of (expensive) FreeListSpace verification") \
1825 \
1826 diagnostic(bool, FLSVerifyIndexTable, false, \
1827 "Do lots of (expensive) FLS index table verification") \
1828 \
1829 develop(bool, FLSVerifyDictionary, false, \
1830 "Do lots of (expensive) FLS dictionary verification") \
1831 \
1832 develop(bool, VerifyBlockOffsetArray, false, \
1833 "Do (expensive) block offset array verification") \
1834 \
1835 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1836 "Maintain _unallocated_block in BlockOffsetArray " \
1837 "(currently applicable only to CMS collector)") \
1838 \
1839 develop(bool, TraceCMSState, false, \
1840 "Trace the state of the CMS collection") \
1841 \
1842 product(intx, RefDiscoveryPolicy, 0, \
1843 "Select type of reference discovery policy: " \
1844 "reference-based(0) or referent-based(1)") \
1845 \
1846 product(bool, ParallelRefProcEnabled, false, \
1847 "Enable parallel reference processing whenever possible") \
1848 \
1849 product(bool, ParallelRefProcBalancingEnabled, true, \
1850 "Enable balancing of reference processing queues") \
1851 \
1852 product(uintx, CMSTriggerRatio, 80, \
1853 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1854 "allocated before a CMS collection cycle commences") \
1855 \
1856 product(uintx, CMSBootstrapOccupancy, 50, \
1857 "Percentage CMS generation occupancy at which to " \
1858 "initiate CMS collection for bootstrapping collection stats") \
1859 \
1860 product(intx, CMSInitiatingOccupancyFraction, -1, \
1861 "Percentage CMS generation occupancy to start a CMS collection " \
1862 "cycle. A negative value means that CMSTriggerRatio is used") \
1863 \
1864 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1865 "Percentage of the (entire) heap occupancy to start a " \
1866 "concurrent GC cycle. It is used by GCs that trigger a " \
1867 "concurrent GC cycle based on the occupancy of the entire heap, " \
1868 "not just one of the generations (e.g., G1). A value of 0 " \
1869 "denotes 'do constant GC cycles'.") \
1870 \
1871 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1872 "Only use occupancy as a criterion for starting a CMS collection")\
1873 \
1874 product(uintx, CMSIsTooFullPercentage, 98, \
1875 "An absolute ceiling above which CMS will always consider the " \
1876 "unloading of classes when class unloading is enabled") \
1877 \
1878 develop(bool, CMSTestInFreeList, false, \
1879 "Check if the coalesced range is already in the " \
1880 "free lists as claimed") \
1881 \
1882 notproduct(bool, CMSVerifyReturnedBytes, false, \
1883 "Check that all the garbage collected was returned to the " \
1884 "free lists") \
1885 \
1886 notproduct(bool, ScavengeALot, false, \
1887 "Force scavenge at every Nth exit from the runtime system " \
1888 "(N=ScavengeALotInterval)") \
1889 \
1890 develop(bool, FullGCALot, false, \
1891 "Force full gc at every Nth exit from the runtime system " \
1892 "(N=FullGCALotInterval)") \
1893 \
1894 notproduct(bool, GCALotAtAllSafepoints, false, \
1895 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1896 \
1897 product(bool, PrintPromotionFailure, false, \
1898 "Print additional diagnostic information following " \
1899 "promotion failure") \
1900 \
1901 notproduct(bool, PromotionFailureALot, false, \
1902 "Use promotion failure handling on every youngest generation " \
1903 "collection") \
1904 \
1905 develop(uintx, PromotionFailureALotCount, 1000, \
1906 "Number of promotion failures occurring at ParGCAllocBuffer " \
1907 "refill attempts (ParNew) or promotion attempts " \
1908 "(other young collectors)") \
1909 \
1910 develop(uintx, PromotionFailureALotInterval, 5, \
1911 "Total collections between promotion failures alot") \
1912 \
1913 experimental(uintx, WorkStealingSleepMillis, 1, \
1914 "Sleep time when sleep is used for yields") \
1915 \
1916 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1917 "Number of yields before a sleep is done during workstealing") \
1918 \
1919 experimental(uintx, WorkStealingHardSpins, 4096, \
1920 "Number of iterations in a spin loop between checks on " \
1921 "time out of hard spin") \
1922 \
1923 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1924 "Ratio of hard spins to calls to yield") \
1925 \
1926 develop(uintx, ObjArrayMarkingStride, 512, \
1927 "Number of object array elements to push onto the marking stack " \
1928 "before pushing a continuation entry") \
1929 \
1930 develop(bool, MetadataAllocationFailALot, false, \
1931 "Fail metadata allocations at intervals controlled by " \
1932 "MetadataAllocationFailALotInterval") \
1933 \
1934 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1935 "Metadata allocation failure a lot interval") \
1936 \
1937 develop(bool, MetaDataDeallocateALot, false, \
1938 "Deallocation bunches of metadata at intervals controlled by " \
1939 "MetaDataAllocateALotInterval") \
1940 \
1941 develop(uintx, MetaDataDeallocateALotInterval, 100, \
1942 "Metadata deallocation alot interval") \
1943 \
1944 develop(bool, TraceMetadataChunkAllocation, false, \
1945 "Trace chunk metadata allocations") \
1946 \
1947 product(bool, TraceMetadataHumongousAllocation, false, \
1948 "Trace humongous metadata allocations") \
1949 \
1950 develop(bool, TraceMetavirtualspaceAllocation, false, \
1951 "Trace virtual space metadata allocations") \
1952 \
1953 notproduct(bool, ExecuteInternalVMTests, false, \
1954 "Enable execution of internal VM tests") \
1955 \
1956 notproduct(bool, VerboseInternalVMTests, false, \
1957 "Turn on logging for internal VM tests.") \
1958 \
1959 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1960 \
1961 product_pd(bool, ResizeTLAB, \
1962 "Dynamically resize TLAB size for threads") \
1963 \
1964 product(bool, ZeroTLAB, false, \
1965 "Zero out the newly created TLAB") \
1966 \
1967 product(bool, FastTLABRefill, true, \
1968 "Use fast TLAB refill code") \
1969 \
1970 product(bool, PrintTLAB, false, \
1971 "Print various TLAB related information") \
1972 \
1973 product(bool, TLABStats, true, \
1974 "Provide more detailed and expensive TLAB statistics " \
1975 "(with PrintTLAB)") \
1976 \
1977 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
1978 "Enable LowMemoryProtection")) \
1979 \
1980 product_pd(bool, NeverActAsServerClassMachine, \
1981 "Never act like a server-class machine") \
1982 \
1983 product(bool, AlwaysActAsServerClassMachine, false, \
1984 "Always act like a server-class machine") \
1985 \
1986 product_pd(uint64_t, MaxRAM, \
1987 "Real memory size (in bytes) used to set maximum heap size") \
1988 \
1989 product(uintx, ErgoHeapSizeLimit, 0, \
1990 "Maximum ergonomically set heap size (in bytes); zero means use " \
1991 "MaxRAM / MaxRAMFraction") \
1992 \
1993 product(uintx, MaxRAMFraction, 4, \
1994 "Maximum fraction (1/n) of real memory used for maximum heap " \
1995 "size") \
1996 \
1997 product(uintx, DefaultMaxRAMFraction, 4, \
1998 "Maximum fraction (1/n) of real memory used for maximum heap " \
1999 "size; deprecated: to be renamed to MaxRAMFraction") \
2000 \
2001 product(uintx, MinRAMFraction, 2, \
2002 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
2003 "size on systems with small physical memory size") \
2004 \
2005 product(uintx, InitialRAMFraction, 64, \
2006 "Fraction (1/n) of real memory used for initial heap size") \
2007 \
2008 develop(uintx, MaxVirtMemFraction, 2, \
2009 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2010 "determining maximum heap size") \
2011 \
2012 product(bool, UseAutoGCSelectPolicy, false, \
2013 "Use automatic collection selection policy") \
2014 \
2015 product(uintx, AutoGCSelectPauseMillis, 5000, \
2016 "Automatic GC selection pause threshold in milliseconds") \
2017 \
2018 product(bool, UseAdaptiveSizePolicy, true, \
2019 "Use adaptive generation sizing policies") \
2020 \
2021 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2022 "Use adaptive survivor sizing policies") \
2023 \
2024 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2025 "Use adaptive young-old sizing policies at minor collections") \
2026 \
2027 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2028 "Use adaptive young-old sizing policies at major collections") \
2029 \
2030 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2031 "Include statistics from System.gc() for adaptive size policy") \
2032 \
2033 product(bool, UseAdaptiveGCBoundary, false, \
2034 "Allow young-old boundary to move") \
2035 \
2036 develop(bool, TraceAdaptiveGCBoundary, false, \
2037 "Trace young-old boundary moves") \
2038 \
2039 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2040 "Resize the virtual spaces of the young or old generations") \
2041 \
2042 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2043 "Policy for changing generation size for throughput goals") \
2044 \
2045 product(uintx, AdaptiveSizePausePolicy, 0, \
2046 "Policy for changing generation size for pause goals") \
2047 \
2048 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2049 "Adjust tenured generation to achieve a minor pause goal") \
2050 \
2051 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2052 "Adjust young generation to achieve a major pause goal") \
2053 \
2054 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2055 "Number of steps where heuristics is used before data is used") \
2056 \
2057 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2058 "Number of collections before the adaptive sizing is started") \
2059 \
2060 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2061 "Collection interval for printing information; zero means never") \
2062 \
2063 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2064 "Use adaptive minimum footprint as a goal") \
2065 \
2066 product(uintx, AdaptiveSizePolicyWeight, 10, \
2067 "Weight given to exponential resizing, between 0 and 100") \
2068 \
2069 product(uintx, AdaptiveTimeWeight, 25, \
2070 "Weight given to time in adaptive policy, between 0 and 100") \
2071 \
2072 product(uintx, PausePadding, 1, \
2073 "How much buffer to keep for pause time") \
2074 \
2075 product(uintx, PromotedPadding, 3, \
2076 "How much buffer to keep for promotion failure") \
2077 \
2078 product(uintx, SurvivorPadding, 3, \
2079 "How much buffer to keep for survivor overflow") \
2080 \
2081 product(uintx, ThresholdTolerance, 10, \
2082 "Allowed collection cost difference between generations") \
2083 \
2084 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2085 "If collection costs are within margin, reduce both by full " \
2086 "delta") \
2087 \
2088 product(uintx, YoungGenerationSizeIncrement, 20, \
2089 "Adaptive size percentage change in young generation") \
2090 \
2091 product(uintx, YoungGenerationSizeSupplement, 80, \
2092 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2093 \
2094 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2095 "Decay factor to YoungedGenerationSizeSupplement") \
2096 \
2097 product(uintx, TenuredGenerationSizeIncrement, 20, \
2098 "Adaptive size percentage change in tenured generation") \
2099 \
2100 product(uintx, TenuredGenerationSizeSupplement, 80, \
2101 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2102 \
2103 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2104 "Decay factor to TenuredGenerationSizeIncrement") \
2105 \
2106 product(uintx, MaxGCPauseMillis, max_uintx, \
2107 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2108 "or (G1 Only) the maximum GC time per MMU time slice") \
2109 \
2110 product(uintx, GCPauseIntervalMillis, 0, \
2111 "Time slice for MMU specification") \
2112 \
2113 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2114 "Adaptive size policy maximum GC minor pause time goal " \
2115 "in millisecond") \
2116 \
2117 product(uintx, GCTimeRatio, 99, \
2118 "Adaptive size policy application time to GC time ratio") \
2119 \
2120 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2121 "Adaptive size scale down factor for shrinking") \
2122 \
2123 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2124 "Adaptive size decays the major cost for long major intervals") \
2125 \
2126 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2127 "Time scale over which major costs decay") \
2128 \
2129 product(uintx, MinSurvivorRatio, 3, \
2130 "Minimum ratio of young generation/survivor space size") \
2131 \
2132 product(uintx, InitialSurvivorRatio, 8, \
2133 "Initial ratio of eden/survivor space size") \
2134 \
2135 product(uintx, BaseFootPrintEstimate, 256*M, \
2136 "Estimate of footprint other than Java Heap") \
2137 \
2138 product(bool, UseGCOverheadLimit, true, \
2139 "Use policy to limit of proportion of time spent in GC " \
2140 "before an OutOfMemory error is thrown") \
2141 \
2142 product(uintx, GCTimeLimit, 98, \
2143 "Limit of the proportion of time spent in GC before " \
2144 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2145 \
2146 product(uintx, GCHeapFreeLimit, 2, \
2147 "Minimum percentage of free space after a full GC before an " \
2148 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2149 \
2150 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2151 "Number of consecutive collections before gc time limit fires") \
2152 \
2153 product(bool, PrintAdaptiveSizePolicy, false, \
2154 "Print information about AdaptiveSizePolicy") \
2155 \
2156 product(intx, PrefetchCopyIntervalInBytes, -1, \
2157 "How far ahead to prefetch destination area (<= 0 means off)") \
2158 \
2159 product(intx, PrefetchScanIntervalInBytes, -1, \
2160 "How far ahead to prefetch scan area (<= 0 means off)") \
2161 \
2162 product(intx, PrefetchFieldsAhead, -1, \
2163 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2164 \
2165 diagnostic(bool, VerifySilently, false, \
2166 "Do not print the verification progress") \
2167 \
2168 diagnostic(bool, VerifyDuringStartup, false, \
2169 "Verify memory system before executing any Java code " \
2170 "during VM initialization") \
2171 \
2172 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2173 "Verify system before exiting") \
2174 \
2175 diagnostic(bool, VerifyBeforeGC, false, \
2176 "Verify memory system before GC") \
2177 \
2178 diagnostic(bool, VerifyAfterGC, false, \
2179 "Verify memory system after GC") \
2180 \
2181 diagnostic(bool, VerifyDuringGC, false, \
2182 "Verify memory system during GC (between phases)") \
2183 \
2184 diagnostic(bool, GCParallelVerificationEnabled, true, \
2185 "Enable parallel memory system verification") \
2186 \
2187 diagnostic(bool, DeferInitialCardMark, false, \
2188 "When +ReduceInitialCardMarks, explicitly defer any that " \
2189 "may arise from new_pre_store_barrier") \
2190 \
2191 diagnostic(bool, VerifyRememberedSets, false, \
2192 "Verify GC remembered sets") \
2193 \
2194 diagnostic(bool, VerifyObjectStartArray, true, \
2195 "Verify GC object start array if verify before/after") \
2196 \
2197 product(bool, DisableExplicitGC, false, \
2198 "Ignore calls to System.gc()") \
2199 \
2200 notproduct(bool, CheckMemoryInitialization, false, \
2201 "Check memory initialization") \
2202 \
2203 product(bool, CollectGen0First, false, \
2204 "Collect youngest generation before each full GC") \
2205 \
2206 diagnostic(bool, BindCMSThreadToCPU, false, \
2207 "Bind CMS Thread to CPU if possible") \
2208 \
2209 diagnostic(uintx, CPUForCMSThread, 0, \
2210 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2211 \
2212 product(bool, BindGCTaskThreadsToCPUs, false, \
2213 "Bind GCTaskThreads to CPUs if possible") \
2214 \
2215 product(bool, UseGCTaskAffinity, false, \
2216 "Use worker affinity when asking for GCTasks") \
2217 \
2218 product(uintx, ProcessDistributionStride, 4, \
2219 "Stride through processors when distributing processes") \
2220 \
2221 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2222 "Number of times the coordinator GC thread will sleep while " \
2223 "yielding before giving up and resuming GC") \
2224 \
2225 product(uintx, CMSYieldSleepCount, 0, \
2226 "Number of times a GC thread (minus the coordinator) " \
2227 "will sleep while yielding before giving up and resuming GC") \
2228 \
2229 /* gc tracing */ \
2230 manageable(bool, PrintGC, false, \
2231 "Print message at garbage collection") \
2232 \
2233 manageable(bool, PrintGCDetails, false, \
2234 "Print more details at garbage collection") \
2235 \
2236 manageable(bool, PrintGCDateStamps, false, \
2237 "Print date stamps at garbage collection") \
2238 \
2239 manageable(bool, PrintGCTimeStamps, false, \
2240 "Print timestamps at garbage collection") \
2241 \
2242 product(bool, PrintGCTaskTimeStamps, false, \
2243 "Print timestamps for individual gc worker thread tasks") \
2244 \
2245 develop(intx, ConcGCYieldTimeout, 0, \
2246 "If non-zero, assert that GC threads yield within this " \
2247 "number of milliseconds") \
2248 \
2249 notproduct(bool, TraceMarkSweep, false, \
2250 "Trace mark sweep") \
2251 \
2252 product(bool, PrintReferenceGC, false, \
2253 "Print times spent handling reference objects during GC " \
2254 "(enabled only when PrintGCDetails)") \
2255 \
2256 develop(bool, TraceReferenceGC, false, \
2257 "Trace handling of soft/weak/final/phantom references") \
2258 \
2259 develop(bool, TraceFinalizerRegistration, false, \
2260 "Trace registration of final references") \
2261 \
2262 notproduct(bool, TraceScavenge, false, \
2263 "Trace scavenge") \
2264 \
2265 product_rw(bool, TraceClassLoading, false, \
2266 "Trace all classes loaded") \
2267 \
2268 product(bool, TraceClassLoadingPreorder, false, \
2269 "Trace all classes loaded in order referenced (not loaded)") \
2270 \
2271 product_rw(bool, TraceClassUnloading, false, \
2272 "Trace unloading of classes") \
2273 \
2274 product_rw(bool, TraceLoaderConstraints, false, \
2275 "Trace loader constraints") \
2276 \
2277 develop(bool, TraceClassLoaderData, false, \
2278 "Trace class loader loader_data lifetime") \
2279 \
2280 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2281 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2282 "Initial size of the boot class loader data metaspace") \
2283 \
2284 product(bool, TraceGen0Time, false, \
2285 "Trace accumulated time for Gen 0 collection") \
2286 \
2287 product(bool, TraceGen1Time, false, \
2288 "Trace accumulated time for Gen 1 collection") \
2289 \
2290 product(bool, PrintTenuringDistribution, false, \
2291 "Print tenuring age information") \
2292 \
2293 product_rw(bool, PrintHeapAtGC, false, \
2294 "Print heap layout before and after each GC") \
2295 \
2296 product_rw(bool, PrintHeapAtGCExtended, false, \
2297 "Print extended information about the layout of the heap " \
2298 "when -XX:+PrintHeapAtGC is set") \
2299 \
2300 product(bool, PrintHeapAtSIGBREAK, true, \
2301 "Print heap layout in response to SIGBREAK") \
2302 \
2303 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2304 "Print a class histogram before any major stop-world GC") \
2305 \
2306 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2307 "Print a class histogram after any major stop-world GC") \
2308 \
2309 manageable(bool, PrintClassHistogram, false, \
2310 "Print a histogram of class instances") \
2311 \
2312 develop(bool, TraceWorkGang, false, \
2313 "Trace activities of work gangs") \
2314 \
2315 product(bool, TraceParallelOldGCTasks, false, \
2316 "Trace multithreaded GC activity") \
2317 \
2318 develop(bool, TraceBlockOffsetTable, false, \
2319 "Print BlockOffsetTable maps") \
2320 \
2321 develop(bool, TraceCardTableModRefBS, false, \
2322 "Print CardTableModRefBS maps") \
2323 \
2324 develop(bool, TraceGCTaskManager, false, \
2325 "Trace actions of the GC task manager") \
2326 \
2327 develop(bool, TraceGCTaskQueue, false, \
2328 "Trace actions of the GC task queues") \
2329 \
2330 diagnostic(bool, TraceGCTaskThread, false, \
2331 "Trace actions of the GC task threads") \
2332 \
2333 product(bool, PrintParallelOldGCPhaseTimes, false, \
2334 "Print the time taken by each phase in ParallelOldGC " \
2335 "(PrintGCDetails must also be enabled)") \
2336 \
2337 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2338 "Trace marking phase in ParallelOldGC") \
2339 \
2340 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2341 "Trace summary phase in ParallelOldGC") \
2342 \
2343 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2344 "Trace compaction phase in ParallelOldGC") \
2345 \
2346 develop(bool, TraceParallelOldGCDensePrefix, false, \
2347 "Trace dense prefix computation for ParallelOldGC") \
2348 \
2349 develop(bool, IgnoreLibthreadGPFault, false, \
2350 "Suppress workaround for libthread GP fault") \
2351 \
2352 product(bool, PrintJNIGCStalls, false, \
2353 "Print diagnostic message when GC is stalled " \
2354 "by JNI critical section") \
2355 \
2356 experimental(double, ObjectCountCutOffPercent, 0.5, \
2357 "The percentage of the used heap that the instances of a class " \
2358 "must occupy for the class to generate a trace event") \
2359 \
2360 /* GC log rotation setting */ \
2361 \
2362 product(bool, UseGCLogFileRotation, false, \
2363 "Rotate gclog files (for long running applications). It requires "\
2364 "-Xloggc:<filename>") \
2365 \
2366 product(uintx, NumberOfGCLogFiles, 0, \
2367 "Number of gclog files in rotation " \
2368 "(default: 0, no rotation)") \
2369 \
2370 product(uintx, GCLogFileSize, 0, \
2371 "GC log file size (default: 0 bytes, no rotation). " \
2372 "It requires UseGCLogFileRotation") \
2373 \
2374 /* JVMTI heap profiling */ \
2375 \
2376 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2377 "Trace JVMTI object tagging calls") \
2378 \
2379 diagnostic(bool, VerifyBeforeIteration, false, \
2380 "Verify memory system before JVMTI iteration") \
2381 \
2382 /* compiler interface */ \
2383 \
2384 develop(bool, CIPrintCompilerName, false, \
2385 "when CIPrint is active, print the name of the active compiler") \
2386 \
2387 develop(bool, CIPrintCompileQueue, false, \
2388 "display the contents of the compile queue whenever a " \
2389 "compilation is enqueued") \
2390 \
2391 develop(bool, CIPrintRequests, false, \
2392 "display every request for compilation") \
2393 \
2394 product(bool, CITime, false, \
2395 "collect timing information for compilation") \
2396 \
2397 develop(bool, CITimeEach, false, \
2398 "display timing information after each successful compilation") \
2399 \
2400 develop(bool, CICountOSR, false, \
2401 "use a separate counter when assigning ids to osr compilations") \
2402 \
2403 develop(bool, CICompileNatives, true, \
2404 "compile native methods if supported by the compiler") \
2405 \
2406 develop_pd(bool, CICompileOSR, \
2407 "compile on stack replacement methods if supported by the " \
2408 "compiler") \
2409 \
2410 develop(bool, CIPrintMethodCodes, false, \
2411 "print method bytecodes of the compiled code") \
2412 \
2413 develop(bool, CIPrintTypeFlow, false, \
2414 "print the results of ciTypeFlow analysis") \
2415 \
2416 develop(bool, CITraceTypeFlow, false, \
2417 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2418 \
2419 develop(intx, OSROnlyBCI, -1, \
2420 "OSR only at this bci. Negative values mean exclude that bci") \
2421 \
2422 /* compiler */ \
2423 \
2424 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2425 "Number of compiler threads to run") \
2426 \
2427 product(intx, CompilationPolicyChoice, 0, \
2428 "which compilation policy (0/1)") \
2429 \
2430 develop(bool, UseStackBanging, true, \
2431 "use stack banging for stack overflow checks (required for " \
2432 "proper StackOverflow handling; disable only to measure cost " \
2433 "of stackbanging)") \
2434 \
2435 develop(bool, UseStrictFP, true, \
2436 "use strict fp if modifier strictfp is set") \
2437 \
2438 develop(bool, GenerateSynchronizationCode, true, \
2439 "generate locking/unlocking code for synchronized methods and " \
2440 "monitors") \
2441 \
2442 develop(bool, GenerateCompilerNullChecks, true, \
2443 "Generate explicit null checks for loads/stores/calls") \
2444 \
2445 develop(bool, GenerateRangeChecks, true, \
2446 "Generate range checks for array accesses") \
2447 \
2448 develop_pd(bool, ImplicitNullChecks, \
2449 "Generate code for implicit null checks") \
2450 \
2451 product(bool, PrintSafepointStatistics, false, \
2452 "Print statistics about safepoint synchronization") \
2453 \
2454 product(intx, PrintSafepointStatisticsCount, 300, \
2455 "Total number of safepoint statistics collected " \
2456 "before printing them out") \
2457 \
2458 product(intx, PrintSafepointStatisticsTimeout, -1, \
2459 "Print safepoint statistics only when safepoint takes " \
2460 "more than PrintSafepointSatisticsTimeout in millis") \
2461 \
2462 product(bool, TraceSafepointCleanupTime, false, \
2463 "Print the break down of clean up tasks performed during " \
2464 "safepoint") \
2465 \
2466 product(bool, Inline, true, \
2467 "Enable inlining") \
2468 \
2469 product(bool, ClipInlining, true, \
2470 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2471 \
2472 develop(bool, UseCHA, true, \
2473 "Enable CHA") \
2474 \
2475 product(bool, UseTypeProfile, true, \
2476 "Check interpreter profile for historically monomorphic calls") \
2477 \
2478 notproduct(bool, TimeCompiler, false, \
2479 "Time the compiler") \
2480 \
2481 diagnostic(bool, PrintInlining, false, \
2482 "Print inlining optimizations") \
2483 \
2484 product(bool, UsePopCountInstruction, false, \
2485 "Use population count instruction") \
2486 \
2487 develop(bool, EagerInitialization, false, \
2488 "Eagerly initialize classes if possible") \
2489 \
2490 develop(bool, TraceMethodReplacement, false, \
2491 "Print when methods are replaced do to recompilation") \
2492 \
2493 develop(bool, PrintMethodFlushing, false, \
2494 "Print the nmethods being flushed") \
2495 \
2496 develop(bool, UseRelocIndex, false, \
2497 "Use an index to speed random access to relocations") \
2498 \
2499 develop(bool, StressCodeBuffers, false, \
2500 "Exercise code buffer expansion and other rare state changes") \
2501 \
2502 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2503 "Generate extra debugging information for non-safepoints in " \
2504 "nmethods") \
2505 \
2506 product(bool, PrintVMOptions, false, \
2507 "Print flags that appeared on the command line") \
2508 \
2509 product(bool, IgnoreUnrecognizedVMOptions, false, \
2510 "Ignore unrecognized VM options") \
2511 \
2512 product(bool, PrintCommandLineFlags, false, \
2513 "Print flags specified on command line or set by ergonomics") \
2514 \
2515 product(bool, PrintFlagsInitial, false, \
2516 "Print all VM flags before argument processing and exit VM") \
2517 \
2518 product(bool, PrintFlagsFinal, false, \
2519 "Print all VM flags after argument and ergonomic processing") \
2520 \
2521 notproduct(bool, PrintFlagsWithComments, false, \
2522 "Print all VM flags with default values and descriptions and " \
2523 "exit") \
2524 \
2525 diagnostic(bool, SerializeVMOutput, true, \
2526 "Use a mutex to serialize output to tty and LogFile") \
2527 \
2528 diagnostic(bool, DisplayVMOutput, true, \
2529 "Display all VM output on the tty, independently of LogVMOutput") \
2530 \
2531 diagnostic(bool, LogVMOutput, false, \
2532 "Save VM output to LogFile") \
2533 \
2534 diagnostic(ccstr, LogFile, NULL, \
2535 "If LogVMOutput or LogCompilation is on, save VM output to " \
2536 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2537 \
2538 product(ccstr, ErrorFile, NULL, \
2539 "If an error occurs, save the error data to this file " \
2540 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2541 \
2542 product(bool, DisplayVMOutputToStderr, false, \
2543 "If DisplayVMOutput is true, display all VM output to stderr") \
2544 \
2545 product(bool, DisplayVMOutputToStdout, false, \
2546 "If DisplayVMOutput is true, display all VM output to stdout") \
2547 \
2548 product(bool, UseHeavyMonitors, false, \
2549 "use heavyweight instead of lightweight Java monitors") \
2550 \
2551 product(bool, PrintStringTableStatistics, false, \
2552 "print statistics about the StringTable and SymbolTable") \
2553 \
2554 diagnostic(bool, VerifyStringTableAtExit, false, \
2555 "verify StringTable contents at exit") \
2556 \
2557 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2558 "print histogram of the symbol table") \
2559 \
2560 notproduct(bool, ExitVMOnVerifyError, false, \
2561 "standard exit from VM if bytecode verify error " \
2562 "(only in debug mode)") \
2563 \
2564 notproduct(ccstr, AbortVMOnException, NULL, \
2565 "Call fatal if this exception is thrown. Example: " \
2566 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2567 \
2568 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2569 "Call fatal if the exception pointed by AbortVMOnException " \
2570 "has this message") \
2571 \
2572 develop(bool, DebugVtables, false, \
2573 "add debugging code to vtable dispatch") \
2574 \
2575 develop(bool, PrintVtables, false, \
2576 "print vtables when printing klass") \
2577 \
2578 notproduct(bool, PrintVtableStats, false, \
2579 "print vtables stats at end of run") \
2580 \
2581 develop(bool, TraceCreateZombies, false, \
2582 "trace creation of zombie nmethods") \
2583 \
2584 notproduct(bool, IgnoreLockingAssertions, false, \
2585 "disable locking assertions (for speed)") \
2586 \
2587 product(bool, RangeCheckElimination, true, \
2588 "Eliminate range checks") \
2589 \
2590 develop_pd(bool, UncommonNullCast, \
2591 "track occurrences of null in casts; adjust compiler tactics") \
2592 \
2593 develop(bool, TypeProfileCasts, true, \
2594 "treat casts like calls for purposes of type profiling") \
2595 \
2596 develop(bool, DelayCompilationDuringStartup, true, \
2597 "Delay invoking the compiler until main application class is " \
2598 "loaded") \
2599 \
2600 develop(bool, CompileTheWorld, false, \
2601 "Compile all methods in all classes in bootstrap class path " \
2602 "(stress test)") \
2603 \
2604 develop(bool, CompileTheWorldPreloadClasses, true, \
2605 "Preload all classes used by a class before start loading") \
2606 \
2607 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2608 "Force a safepoint every n compiles so sweeper can keep up") \
2609 \
2610 develop(bool, FillDelaySlots, true, \
2611 "Fill delay slots (on SPARC only)") \
2612 \
2613 develop(bool, TimeLivenessAnalysis, false, \
2614 "Time computation of bytecode liveness analysis") \
2615 \
2616 develop(bool, TraceLivenessGen, false, \
2617 "Trace the generation of liveness analysis information") \
2618 \
2619 notproduct(bool, TraceLivenessQuery, false, \
2620 "Trace queries of liveness analysis information") \
2621 \
2622 notproduct(bool, CollectIndexSetStatistics, false, \
2623 "Collect information about IndexSets") \
2624 \
2625 develop(bool, UseLoopSafepoints, true, \
2626 "Generate Safepoint nodes in every loop") \
2627 \
2628 develop(intx, FastAllocateSizeLimit, 128*K, \
2629 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2630 "Inline allocations larger than this in doublewords must go slow")\
2631 \
2632 product(bool, AggressiveOpts, false, \
2633 "Enable aggressive optimizations - see arguments.cpp") \
2634 \
2635 /* statistics */ \
2636 develop(bool, CountCompiledCalls, false, \
2637 "Count method invocations") \
2638 \
2639 notproduct(bool, CountRuntimeCalls, false, \
2640 "Count VM runtime calls") \
2641 \
2642 develop(bool, CountJNICalls, false, \
2643 "Count jni method invocations") \
2644 \
2645 notproduct(bool, CountJVMCalls, false, \
2646 "Count jvm method invocations") \
2647 \
2648 notproduct(bool, CountRemovableExceptions, false, \
2649 "Count exceptions that could be replaced by branches due to " \
2650 "inlining") \
2651 \
2652 notproduct(bool, ICMissHistogram, false, \
2653 "Produce histogram of IC misses") \
2654 \
2655 notproduct(bool, PrintClassStatistics, false, \
2656 "Print class statistics at end of run") \
2657 \
2658 notproduct(bool, PrintMethodStatistics, false, \
2659 "Print method statistics at end of run") \
2660 \
2661 /* interpreter */ \
2662 develop(bool, ClearInterpreterLocals, false, \
2663 "Always clear local variables of interpreter activations upon " \
2664 "entry") \
2665 \
2666 product_pd(bool, RewriteBytecodes, \
2667 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2668 \
2669 product_pd(bool, RewriteFrequentPairs, \
2670 "Rewrite frequently used bytecode pairs into a single bytecode") \
2671 \
2672 diagnostic(bool, PrintInterpreter, false, \
2673 "Print the generated interpreter code") \
2674 \
2675 product(bool, UseInterpreter, true, \
2676 "Use interpreter for non-compiled methods") \
2677 \
2678 develop(bool, UseFastSignatureHandlers, true, \
2679 "Use fast signature handlers for native calls") \
2680 \
2681 product(bool, UseLoopCounter, true, \
2682 "Increment invocation counter on backward branch") \
2683 \
2684 product(bool, UseFastEmptyMethods, true, \
2685 "Use fast method entry code for empty methods") \
2686 \
2687 product(bool, UseFastAccessorMethods, true, \
2688 "Use fast method entry code for accessor methods") \
2689 \
2690 product_pd(bool, UseOnStackReplacement, \
2691 "Use on stack replacement, calls runtime if invoc. counter " \
2692 "overflows in loop") \
2693 \
2694 notproduct(bool, TraceOnStackReplacement, false, \
2695 "Trace on stack replacement") \
2696 \
2697 product_pd(bool, PreferInterpreterNativeStubs, \
2698 "Use always interpreter stubs for native methods invoked via " \
2699 "interpreter") \
2700 \
2701 develop(bool, CountBytecodes, false, \
2702 "Count number of bytecodes executed") \
2703 \
2704 develop(bool, PrintBytecodeHistogram, false, \
2705 "Print histogram of the executed bytecodes") \
2706 \
2707 develop(bool, PrintBytecodePairHistogram, false, \
2708 "Print histogram of the executed bytecode pairs") \
2709 \
2710 diagnostic(bool, PrintSignatureHandlers, false, \
2711 "Print code generated for native method signature handlers") \
2712 \
2713 develop(bool, VerifyOops, false, \
2714 "Do plausibility checks for oops") \
2715 \
2716 develop(bool, CheckUnhandledOops, false, \
2717 "Check for unhandled oops in VM code") \
2718 \
2719 develop(bool, VerifyJNIFields, trueInDebug, \
2720 "Verify jfieldIDs for instance fields") \
2721 \
2722 notproduct(bool, VerifyJNIEnvThread, false, \
2723 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2724 "from JNI") \
2725 \
2726 develop(bool, VerifyFPU, false, \
2727 "Verify FPU state (check for NaN's, etc.)") \
2728 \
2729 develop(bool, VerifyThread, false, \
2730 "Watch the thread register for corruption (SPARC only)") \
2731 \
2732 develop(bool, VerifyActivationFrameSize, false, \
2733 "Verify that activation frame didn't become smaller than its " \
2734 "minimal size") \
2735 \
2736 develop(bool, TraceFrequencyInlining, false, \
2737 "Trace frequency based inlining") \
2738 \
2739 develop_pd(bool, InlineIntrinsics, \
2740 "Inline intrinsics that can be statically resolved") \
2741 \
2742 product_pd(bool, ProfileInterpreter, \
2743 "Profile at the bytecode level during interpretation") \
2744 \
2745 develop_pd(bool, ProfileTraps, \
2746 "Profile deoptimization traps at the bytecode level") \
2747 \
2748 product(intx, ProfileMaturityPercentage, 20, \
2749 "number of method invocations/branches (expressed as % of " \
2750 "CompileThreshold) before using the method's profile") \
2751 \
2752 develop(bool, PrintMethodData, false, \
2753 "Print the results of +ProfileInterpreter at end of run") \
2754 \
2755 develop(bool, VerifyDataPointer, trueInDebug, \
2756 "Verify the method data pointer during interpreter profiling") \
2757 \
2758 develop(bool, VerifyCompiledCode, false, \
2759 "Include miscellaneous runtime verifications in nmethod code; " \
2760 "default off because it disturbs nmethod size heuristics") \
2761 \
2762 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2763 "Manually make GC thread crash then dump java stack trace; " \
2764 "Test only") \
2765 \
2766 /* compilation */ \
2767 product(bool, UseCompiler, true, \
2768 "Use Just-In-Time compilation") \
2769 \
2770 develop(bool, TraceCompilationPolicy, false, \
2771 "Trace compilation policy") \
2772 \
2773 develop(bool, TimeCompilationPolicy, false, \
2774 "Time the compilation policy") \
2775 \
2776 product(bool, UseCounterDecay, true, \
2777 "Adjust recompilation counters") \
2778 \
2779 develop(intx, CounterHalfLifeTime, 30, \
2780 "Half-life time of invocation counters (in seconds)") \
2781 \
2782 develop(intx, CounterDecayMinIntervalLength, 500, \
2783 "The minimum interval (in milliseconds) between invocation of " \
2784 "CounterDecay") \
2785 \
2786 product(bool, AlwaysCompileLoopMethods, false, \
2787 "When using recompilation, never interpret methods " \
2788 "containing loops") \
2789 \
2790 product(bool, DontCompileHugeMethods, true, \
2791 "Do not compile methods > HugeMethodLimit") \
2792 \
2793 /* Bytecode escape analysis estimation. */ \
2794 product(bool, EstimateArgEscape, true, \
2795 "Analyze bytecodes to estimate escape state of arguments") \
2796 \
2797 product(intx, BCEATraceLevel, 0, \
2798 "How much tracing to do of bytecode escape analysis estimates") \
2799 \
2800 product(intx, MaxBCEAEstimateLevel, 5, \
2801 "Maximum number of nested calls that are analyzed by BC EA") \
2802 \
2803 product(intx, MaxBCEAEstimateSize, 150, \
2804 "Maximum bytecode size of a method to be analyzed by BC EA") \
2805 \
2806 product(intx, AllocatePrefetchStyle, 1, \
2807 "0 = no prefetch, " \
2808 "1 = prefetch instructions for each allocation, " \
2809 "2 = use TLAB watermark to gate allocation prefetch, " \
2810 "3 = use BIS instruction on Sparc for allocation prefetch") \
2811 \
2812 product(intx, AllocatePrefetchDistance, -1, \
2813 "Distance to prefetch ahead of allocation pointer") \
2814 \
2815 product(intx, AllocatePrefetchLines, 3, \
2816 "Number of lines to prefetch ahead of array allocation pointer") \
2817 \
2818 product(intx, AllocateInstancePrefetchLines, 1, \
2819 "Number of lines to prefetch ahead of instance allocation " \
2820 "pointer") \
2821 \
2822 product(intx, AllocatePrefetchStepSize, 16, \
2823 "Step size in bytes of sequential prefetch instructions") \
2824 \
2825 product(intx, AllocatePrefetchInstr, 0, \
2826 "Prefetch instruction to prefetch ahead of allocation pointer") \
2827 \
2828 /* deoptimization */ \
2829 develop(bool, TraceDeoptimization, false, \
2830 "Trace deoptimization") \
2831 \
2832 develop(bool, DebugDeoptimization, false, \
2833 "Tracing various information while debugging deoptimization") \
2834 \
2835 product(intx, SelfDestructTimer, 0, \
2836 "Will cause VM to terminate after a given time (in minutes) " \
2837 "(0 means off)") \
2838 \
2839 product(intx, MaxJavaStackTraceDepth, 1024, \
2840 "The maximum number of lines in the stack trace for Java " \
2841 "exceptions (0 means all)") \
2842 \
2843 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2844 "Guarantee a safepoint (at least) every so many milliseconds " \
2845 "(0 means none)")) \
2846 \
2847 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2848 "Guarantee a safepoint (at least) every so many milliseconds " \
2849 "(0 means none)")) \
2850 \
2851 product(intx, SafepointTimeoutDelay, 10000, \
2852 "Delay in milliseconds for option SafepointTimeout") \
2853 \
2854 product(intx, NmethodSweepFraction, 16, \
2855 "Number of invocations of sweeper to cover all nmethods") \
2856 \
2857 product(intx, NmethodSweepCheckInterval, 5, \
2858 "Compilers wake up every n seconds to possibly sweep nmethods") \
2859 \
2860 notproduct(bool, LogSweeper, false, \
2861 "Keep a ring buffer of sweeper activity") \
2862 \
2863 notproduct(intx, SweeperLogEntries, 1024, \
2864 "Number of records in the ring buffer of sweeper activity") \
2865 \
2866 notproduct(intx, MemProfilingInterval, 500, \
2867 "Time between each invocation of the MemProfiler") \
2868 \
2869 develop(intx, MallocCatchPtr, -1, \
2870 "Hit breakpoint when mallocing/freeing this pointer") \
2871 \
2872 notproduct(intx, AssertRepeat, 1, \
2873 "number of times to evaluate expression in assert " \
2874 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2875 \
2876 notproduct(ccstrlist, SuppressErrorAt, "", \
2877 "List of assertions (file:line) to muzzle") \
2878 \
2879 notproduct(uintx, HandleAllocationLimit, 1024, \
2880 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2881 "is used") \
2882 \
2883 develop(uintx, TotalHandleAllocationLimit, 1024, \
2884 "Threshold for total handle allocation when " \
2885 "+TraceHandleAllocation is used") \
2886 \
2887 develop(intx, StackPrintLimit, 100, \
2888 "number of stack frames to print in VM-level stack dump") \
2889 \
2890 notproduct(intx, MaxElementPrintSize, 256, \
2891 "maximum number of elements to print") \
2892 \
2893 notproduct(intx, MaxSubklassPrintSize, 4, \
2894 "maximum number of subklasses to print when printing klass") \
2895 \
2896 product(intx, MaxInlineLevel, 9, \
2897 "maximum number of nested calls that are inlined") \
2898 \
2899 product(intx, MaxRecursiveInlineLevel, 1, \
2900 "maximum number of nested recursive calls that are inlined") \
2901 \
2902 product_pd(intx, InlineSmallCode, \
2903 "Only inline already compiled methods if their code size is " \
2904 "less than this") \
2905 \
2906 product(intx, MaxInlineSize, 35, \
2907 "The maximum bytecode size of a method to be inlined") \
2908 \
2909 product_pd(intx, FreqInlineSize, \
2910 "The maximum bytecode size of a frequent method to be inlined") \
2911 \
2912 product(intx, MaxTrivialSize, 6, \
2913 "The maximum bytecode size of a trivial method to be inlined") \
2914 \
2915 product(intx, MinInliningThreshold, 250, \
2916 "The minimum invocation count a method needs to have to be " \
2917 "inlined") \
2918 \
2919 develop(intx, MethodHistogramCutoff, 100, \
2920 "The cutoff value for method invocation histogram (+CountCalls)") \
2921 \
2922 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2923 "Number of interpreted methods to show in profile") \
2924 \
2925 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2926 "Number of compiled methods to show in profile") \
2927 \
2928 develop(intx, ProfilerNumberOfStubMethods, 25, \
2929 "Number of stub methods to show in profile") \
2930 \
2931 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2932 "Number of runtime stub nodes to show in profile") \
2933 \
2934 product(intx, ProfileIntervalsTicks, 100, \
2935 "Number of ticks between printing of interval profile " \
2936 "(+ProfileIntervals)") \
2937 \
2938 notproduct(intx, ScavengeALotInterval, 1, \
2939 "Interval between which scavenge will occur with +ScavengeALot") \
2940 \
2941 notproduct(intx, FullGCALotInterval, 1, \
2942 "Interval between which full gc will occur with +FullGCALot") \
2943 \
2944 notproduct(intx, FullGCALotStart, 0, \
2945 "For which invocation to start FullGCAlot") \
2946 \
2947 notproduct(intx, FullGCALotDummies, 32*K, \
2948 "Dummy object allocated with +FullGCALot, forcing all objects " \
2949 "to move") \
2950 \
2951 develop(intx, DontYieldALotInterval, 10, \
2952 "Interval between which yields will be dropped (milliseconds)") \
2953 \
2954 develop(intx, MinSleepInterval, 1, \
2955 "Minimum sleep() interval (milliseconds) when " \
2956 "ConvertSleepToYield is off (used for Solaris)") \
2957 \
2958 develop(intx, ProfilerPCTickThreshold, 15, \
2959 "Number of ticks in a PC buckets to be a hotspot") \
2960 \
2961 notproduct(intx, DeoptimizeALotInterval, 5, \
2962 "Number of exits until DeoptimizeALot kicks in") \
2963 \
2964 notproduct(intx, ZombieALotInterval, 5, \
2965 "Number of exits until ZombieALot kicks in") \
2966 \
2967 develop(bool, StressNonEntrant, false, \
2968 "Mark nmethods non-entrant at registration") \
2969 \
2970 diagnostic(intx, MallocVerifyInterval, 0, \
2971 "If non-zero, verify C heap after every N calls to " \
2972 "malloc/realloc/free") \
2973 \
2974 diagnostic(intx, MallocVerifyStart, 0, \
2975 "If non-zero, start verifying C heap after Nth call to " \
2976 "malloc/realloc/free") \
2977 \
2978 diagnostic(uintx, MallocMaxTestWords, 0, \
2979 "If non-zero, maximum number of words that malloc/realloc can " \
2980 "allocate (for testing only)") \
2981 \
2982 product(intx, TypeProfileWidth, 2, \
2983 "Number of receiver types to record in call/cast profile") \
2984 \
2985 develop(intx, BciProfileWidth, 2, \
2986 "Number of return bci's to record in ret profile") \
2987 \
2988 product(intx, PerMethodRecompilationCutoff, 400, \
2989 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2990 \
2991 product(intx, PerBytecodeRecompilationCutoff, 200, \
2992 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2993 \
2994 product(intx, PerMethodTrapLimit, 100, \
2995 "Limit on traps (of one kind) in a method (includes inlines)") \
2996 \
2997 product(intx, PerBytecodeTrapLimit, 4, \
2998 "Limit on traps (of one kind) at a particular BCI") \
2999 \
3000 develop(intx, InlineFrequencyRatio, 20, \
3001 "Ratio of call site execution to caller method invocation") \
3002 \
3003 develop_pd(intx, InlineFrequencyCount, \
3004 "Count of call site execution necessary to trigger frequent " \
3005 "inlining") \
3006 \
3007 develop(intx, InlineThrowCount, 50, \
3008 "Force inlining of interpreted methods that throw this often") \
3009 \
3010 develop(intx, InlineThrowMaxSize, 200, \
3011 "Force inlining of throwing methods smaller than this") \
3012 \
3013 develop(intx, ProfilerNodeSize, 1024, \
3014 "Size in K to allocate for the Profile Nodes of each thread") \
3015 \
3016 product_pd(intx, PreInflateSpin, \
3017 "Number of times to spin wait before inflation") \
3018 \
3019 /* gc parameters */ \
3020 product(uintx, InitialHeapSize, 0, \
3021 "Initial heap size (in bytes); zero means use ergonomics") \
3022 \
3023 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3024 "Maximum heap size (in bytes)") \
3025 \
3026 product(uintx, OldSize, ScaleForWordSize(4*M), \
3027 "Initial tenured generation size (in bytes)") \
3028 \
3029 product(uintx, NewSize, ScaleForWordSize(1*M), \
3030 "Initial new generation size (in bytes)") \
3031 \
3032 product(uintx, MaxNewSize, max_uintx, \
3033 "Maximum new generation size (in bytes), max_uintx means set " \
3034 "ergonomically") \
3035 \
3036 product(uintx, PretenureSizeThreshold, 0, \
3037 "Maximum size in bytes of objects allocated in DefNew " \
3038 "generation; zero means no maximum") \
3039 \
3040 product(uintx, TLABSize, 0, \
3041 "Starting TLAB size (in bytes); zero means set ergonomically") \
3042 \
3043 product(uintx, MinTLABSize, 2*K, \
3044 "Minimum allowed TLAB size (in bytes)") \
3045 \
3046 product(uintx, TLABAllocationWeight, 35, \
3047 "Allocation averaging weight") \
3048 \
3049 product(uintx, TLABWasteTargetPercent, 1, \
3050 "Percentage of Eden that can be wasted") \
3051 \
3052 product(uintx, TLABRefillWasteFraction, 64, \
3053 "Maximum TLAB waste at a refill (internal fragmentation)") \
3054 \
3055 product(uintx, TLABWasteIncrement, 4, \
3056 "Increment allowed waste at slow allocation") \
3057 \
3058 product(uintx, SurvivorRatio, 8, \
3059 "Ratio of eden/survivor space size") \
3060 \
3061 product(uintx, NewRatio, 2, \
3062 "Ratio of old/new generation sizes") \
3063 \
3064 product_pd(uintx, NewSizeThreadIncrease, \
3065 "Additional size added to desired new generation size per " \
3066 "non-daemon thread (in bytes)") \
3067 \
3068 product_pd(uintx, MetaspaceSize, \
3069 "Initial size of Metaspaces (in bytes)") \
3070 \
3071 product(uintx, MaxMetaspaceSize, max_uintx, \
3072 "Maximum size of Metaspaces (in bytes)") \
3073 \
3074 product(uintx, CompressedClassSpaceSize, 1*G, \
3075 "Maximum size of class area in Metaspace when compressed " \
3076 "class pointers are used") \
3077 \
3078 product(uintx, MinHeapFreeRatio, 40, \
3079 "The minimum percentage of heap free after GC to avoid expansion")\
3080 \
3081 product(uintx, MaxHeapFreeRatio, 70, \
3082 "The maximum percentage of heap free after GC to avoid shrinking")\
3083 \
3084 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3085 "Number of milliseconds per MB of free space in the heap") \
3086 \
3087 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3088 "The minimum change in heap space due to GC (in bytes)") \
3089 \
3090 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3091 "The minimum expansion of Metaspace (in bytes)") \
3092 \
3093 product(uintx, MinMetaspaceFreeRatio, 40, \
3094 "The minimum percentage of Metaspace free after GC to avoid " \
3095 "expansion") \
3096 \
3097 product(uintx, MaxMetaspaceFreeRatio, 70, \
3098 "The maximum percentage of Metaspace free after GC to avoid " \
3099 "shrinking") \
3100 \
3101 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3102 "The maximum expansion of Metaspace without full GC (in bytes)") \
3103 \
3104 product(uintx, QueuedAllocationWarningCount, 0, \
3105 "Number of times an allocation that queues behind a GC " \
3106 "will retry before printing a warning") \
3107 \
3108 diagnostic(uintx, VerifyGCStartAt, 0, \
3109 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3110 \
3111 diagnostic(intx, VerifyGCLevel, 0, \
3112 "Generation level at which to start +VerifyBefore/AfterGC") \
3113 \
3114 product(uintx, MaxTenuringThreshold, 15, \
3115 "Maximum value for tenuring threshold") \
3116 \
3117 product(uintx, InitialTenuringThreshold, 7, \
3118 "Initial value for tenuring threshold") \
3119 \
3120 product(uintx, TargetSurvivorRatio, 50, \
3121 "Desired percentage of survivor space used after scavenge") \
3122 \
3123 product(uintx, MarkSweepDeadRatio, 5, \
3124 "Percentage (0-100) of the old gen allowed as dead wood. " \
3125 "Serial mark sweep treats this as both the minimum and maximum " \
3126 "value. " \
3127 "CMS uses this value only if it falls back to mark sweep. " \
3128 "Par compact uses a variable scale based on the density of the " \
3129 "generation and treats this as the maximum value when the heap " \
3130 "is either completely full or completely empty. Par compact " \
3131 "also has a smaller default value; see arguments.cpp.") \
3132 \
3133 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3134 "How often should we fully compact the heap (ignoring the dead " \
3135 "space parameters)") \
3136 \
3137 product(intx, PrintCMSStatistics, 0, \
3138 "Statistics for CMS") \
3139 \
3140 product(bool, PrintCMSInitiationStatistics, false, \
3141 "Statistics for initiating a CMS collection") \
3142 \
3143 product(intx, PrintFLSStatistics, 0, \
3144 "Statistics for CMS' FreeListSpace") \
3145 \
3146 product(intx, PrintFLSCensus, 0, \
3147 "Census for CMS' FreeListSpace") \
3148 \
3149 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3150 "Delay between expansion and allocation (in milliseconds)") \
3151 \
3152 develop(uintx, GCWorkerDelayMillis, 0, \
3153 "Delay in scheduling GC workers (in milliseconds)") \
3154 \
3155 product(intx, DeferThrSuspendLoopCount, 4000, \
3156 "(Unstable) Number of times to iterate in safepoint loop " \
3157 "before blocking VM threads ") \
3158 \
3159 product(intx, DeferPollingPageLoopCount, -1, \
3160 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3161 "before changing safepoint polling page to RO ") \
3162 \
3163 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3164 \
3165 product(bool, PSChunkLargeArrays, true, \
3166 "Process large arrays in chunks") \
3167 \
3168 product(uintx, GCDrainStackTargetSize, 64, \
3169 "Number of entries we will try to leave on the stack " \
3170 "during parallel gc") \
3171 \
3172 /* stack parameters */ \
3173 product_pd(intx, StackYellowPages, \
3174 "Number of yellow zone (recoverable overflows) pages") \
3175 \
3176 product_pd(intx, StackRedPages, \
3177 "Number of red zone (unrecoverable overflows) pages") \
3178 \
3179 product_pd(intx, StackShadowPages, \
3180 "Number of shadow zone (for overflow checking) pages " \
3181 "this should exceed the depth of the VM and native call stack") \
3182 \
3183 product_pd(intx, ThreadStackSize, \
3184 "Thread Stack Size (in Kbytes)") \
3185 \
3186 product_pd(intx, VMThreadStackSize, \
3187 "Non-Java Thread Stack Size (in Kbytes)") \
3188 \
3189 product_pd(intx, CompilerThreadStackSize, \
3190 "Compiler Thread Stack Size (in Kbytes)") \
3191 \
3192 develop_pd(uintx, JVMInvokeMethodSlack, \
3193 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3194 \
3195 product(uintx, ThreadSafetyMargin, 50*M, \
3196 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3197 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3198 "disable this feature") \
3199 \
3200 /* code cache parameters */ \
3201 develop(uintx, CodeCacheSegmentSize, 64, \
3202 "Code cache segment size (in bytes) - smallest unit of " \
3203 "allocation") \
3204 \
3205 develop_pd(intx, CodeEntryAlignment, \
3206 "Code entry alignment for generated code (in bytes)") \
3207 \
3208 product_pd(intx, OptoLoopAlignment, \
3209 "Align inner loops to zero relative to this modulus") \
3210 \
3211 product_pd(uintx, InitialCodeCacheSize, \
3212 "Initial code cache size (in bytes)") \
3213 \
3214 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3215 "Minimum code cache size (in bytes) required to start VM.") \
3216 \
3217 product_pd(uintx, ReservedCodeCacheSize, \
3218 "Reserved code cache size (in bytes) - maximum code cache size") \
3219 \
3220 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3221 "When less than X space left, we stop compiling") \
3222 \
3223 product_pd(uintx, CodeCacheExpansionSize, \
3224 "Code cache expansion size (in bytes)") \
3225 \
3226 develop_pd(uintx, CodeCacheMinBlockLength, \
3227 "Minimum number of segments in a code cache block") \
3228 \
3229 notproduct(bool, ExitOnFullCodeCache, false, \
3230 "Exit the VM if we fill the code cache") \
3231 \
3232 product(bool, UseCodeCacheFlushing, true, \
3233 "Attempt to clean the code cache before shutting off compiler") \
3234 \
3235 product(intx, MinCodeCacheFlushingInterval, 30, \
3236 "Minimum number of seconds between code cache cleaning sessions") \
3237 \
3238 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3239 "When less than X space left, start code cache cleaning") \
3240 \
3241 product(uintx, CodeCacheFlushingFraction, 2, \
3242 "Fraction of the code cache that is flushed when full") \
3243 \
3244 /* interpreter debugging */ \
3245 develop(intx, BinarySwitchThreshold, 5, \
3246 "Minimal number of lookupswitch entries for rewriting to binary " \
3247 "switch") \
3248 \
3249 develop(intx, StopInterpreterAt, 0, \
3250 "Stop interpreter execution at specified bytecode number") \
3251 \
3252 develop(intx, TraceBytecodesAt, 0, \
3253 "Trace bytecodes starting with specified bytecode number") \
3254 \
3255 /* compiler interface */ \
3256 develop(intx, CIStart, 0, \
3257 "The id of the first compilation to permit") \
3258 \
3259 develop(intx, CIStop, -1, \
3260 "The id of the last compilation to permit") \
3261 \
3262 develop(intx, CIStartOSR, 0, \
3263 "The id of the first osr compilation to permit " \
3264 "(CICountOSR must be on)") \
3265 \
3266 develop(intx, CIStopOSR, -1, \
3267 "The id of the last osr compilation to permit " \
3268 "(CICountOSR must be on)") \
3269 \
3270 develop(intx, CIBreakAtOSR, -1, \
3271 "The id of osr compilation to break at") \
3272 \
3273 develop(intx, CIBreakAt, -1, \
3274 "The id of compilation to break at") \
3275 \
3276 product(ccstrlist, CompileOnly, "", \
3277 "List of methods (pkg/class.name) to restrict compilation to") \
3278 \
3279 product(ccstr, CompileCommandFile, NULL, \
3280 "Read compiler commands from this file [.hotspot_compiler]") \
3281 \
3282 product(ccstrlist, CompileCommand, "", \
3283 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3284 \
3285 develop(bool, ReplayCompiles, false, \
3286 "Enable replay of compilations from ReplayDataFile") \
3287 \
3288 product(ccstr, ReplayDataFile, NULL, \
3289 "File containing compilation replay information" \
3290 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3291 \
3292 develop(intx, ReplaySuppressInitializers, 2, \
3293 "Control handling of class initialization during replay: " \
3294 "0 - don't do anything special; " \
3295 "1 - treat all class initializers as empty; " \
3296 "2 - treat class initializers for application classes as empty; " \
3297 "3 - allow all class initializers to run during bootstrap but " \
3298 " pretend they are empty after starting replay") \
3299 \
3300 develop(bool, ReplayIgnoreInitErrors, false, \
3301 "Ignore exceptions thrown during initialization for replay") \
3302 \
3303 product(bool, DumpReplayDataOnError, true, \
3304 "Record replay data for crashing compiler threads") \
3305 \
3306 product(bool, CICompilerCountPerCPU, false, \
3307 "1 compiler thread for log(N CPUs)") \
3308 \
3309 develop(intx, CIFireOOMAt, -1, \
3310 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3311 "(non-negative value throws OOM after this many CI accesses " \
3312 "in each compile)") \
3313 notproduct(intx, CICrashAt, -1, \
3314 "id of compilation to trigger assert in compiler thread for " \
3315 "the purpose of testing, e.g. generation of replay data") \
3316 notproduct(bool, CIObjectFactoryVerify, false, \
3317 "enable potentially expensive verification in ciObjectFactory") \
3318 \
3319 /* Priorities */ \
3320 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3321 \
3322 product(intx, ThreadPriorityPolicy, 0, \
3323 "0 : Normal. "\
3324 " VM chooses priorities that are appropriate for normal "\
3325 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3326 " to normal native priority. Java priorities below " \
3327 " NORM_PRIORITY map to lower native priority values. On "\
3328 " Windows applications are allowed to use higher native "\
3329 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3330 " not use the highest possible native priority, "\
3331 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3332 " system threads. On Linux thread priorities are ignored "\
3333 " because the OS does not support static priority in "\
3334 " SCHED_OTHER scheduling class which is the only choice for "\
3335 " non-root, non-realtime applications. "\
3336 "1 : Aggressive. "\
3337 " Java thread priorities map over to the entire range of "\
3338 " native thread priorities. Higher Java thread priorities map "\
3339 " to higher native thread priorities. This policy should be "\
3340 " used with care, as sometimes it can cause performance "\
3341 " degradation in the application and/or the entire system. On "\
3342 " Linux this policy requires root privilege.") \
3343 \
3344 product(bool, ThreadPriorityVerbose, false, \
3345 "Print priority changes") \
3346 \
3347 product(intx, DefaultThreadPriority, -1, \
3348 "The native priority at which threads run if not elsewhere " \
3349 "specified (-1 means no change)") \
3350 \
3351 product(intx, CompilerThreadPriority, -1, \
3352 "The native priority at which compiler threads should run " \
3353 "(-1 means no change)") \
3354 \
3355 product(intx, VMThreadPriority, -1, \
3356 "The native priority at which the VM thread should run " \
3357 "(-1 means no change)") \
3358 \
3359 product(bool, CompilerThreadHintNoPreempt, true, \
3360 "(Solaris only) Give compiler threads an extra quanta") \
3361 \
3362 product(bool, VMThreadHintNoPreempt, false, \
3363 "(Solaris only) Give VM thread an extra quanta") \
3364 \
3365 product(intx, JavaPriority1_To_OSPriority, -1, \
3366 "Map Java priorities to OS priorities") \
3367 \
3368 product(intx, JavaPriority2_To_OSPriority, -1, \
3369 "Map Java priorities to OS priorities") \
3370 \
3371 product(intx, JavaPriority3_To_OSPriority, -1, \
3372 "Map Java priorities to OS priorities") \
3373 \
3374 product(intx, JavaPriority4_To_OSPriority, -1, \
3375 "Map Java priorities to OS priorities") \
3376 \
3377 product(intx, JavaPriority5_To_OSPriority, -1, \
3378 "Map Java priorities to OS priorities") \
3379 \
3380 product(intx, JavaPriority6_To_OSPriority, -1, \
3381 "Map Java priorities to OS priorities") \
3382 \
3383 product(intx, JavaPriority7_To_OSPriority, -1, \
3384 "Map Java priorities to OS priorities") \
3385 \
3386 product(intx, JavaPriority8_To_OSPriority, -1, \
3387 "Map Java priorities to OS priorities") \
3388 \
3389 product(intx, JavaPriority9_To_OSPriority, -1, \
3390 "Map Java priorities to OS priorities") \
3391 \
3392 product(intx, JavaPriority10_To_OSPriority,-1, \
3393 "Map Java priorities to OS priorities") \
3394 \
3395 experimental(bool, UseCriticalJavaThreadPriority, false, \
3396 "Java thread priority 10 maps to critical scheduling priority") \
3397 \
3398 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3399 "Compiler thread(s) run at critical scheduling priority") \
3400 \
3401 experimental(bool, UseCriticalCMSThreadPriority, false, \
3402 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3403 \
3404 /* compiler debugging */ \
3405 notproduct(intx, CompileTheWorldStartAt, 1, \
3406 "First class to consider when using +CompileTheWorld") \
3407 \
3408 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3409 "Last class to consider when using +CompileTheWorld") \
3410 \
3411 develop(intx, NewCodeParameter, 0, \
3412 "Testing Only: Create a dedicated integer parameter before " \
3413 "putback") \
3414 \
3415 /* new oopmap storage allocation */ \
3416 develop(intx, MinOopMapAllocation, 8, \
3417 "Minimum number of OopMap entries in an OopMapSet") \
3418 \
3419 /* Background Compilation */ \
3420 develop(intx, LongCompileThreshold, 50, \
3421 "Used with +TraceLongCompiles") \
3422 \
3423 product(intx, StarvationMonitorInterval, 200, \
3424 "Pause between each check (in milliseconds)") \
3425 \
3426 /* recompilation */ \
3427 product_pd(intx, CompileThreshold, \
3428 "number of interpreted method invocations before (re-)compiling") \
3429 \
3430 product_pd(intx, BackEdgeThreshold, \
3431 "Interpreter Back edge threshold at which an OSR compilation is " \
3432 "invoked") \
3433 \
3434 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3435 "Interpreter (tier 0) invocation notification frequency") \
3436 \
3437 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3438 "C1 without MDO (tier 2) invocation notification frequency") \
3439 \
3440 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3441 "C1 with MDO profiling (tier 3) invocation notification " \
3442 "frequency") \
3443 \
3444 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3445 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3446 \
3447 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3448 "Interpreter (tier 0) invocation notification frequency") \
3449 \
3450 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3451 "C1 without MDO (tier 2) invocation notification frequency") \
3452 \
3453 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3454 "C1 with MDO profiling (tier 3) invocation notification " \
3455 "frequency") \
3456 \
3457 product(intx, Tier2CompileThreshold, 0, \
3458 "threshold at which tier 2 compilation is invoked") \
3459 \
3460 product(intx, Tier2BackEdgeThreshold, 0, \
3461 "Back edge threshold at which tier 2 compilation is invoked") \
3462 \
3463 product(intx, Tier3InvocationThreshold, 200, \
3464 "Compile if number of method invocations crosses this " \
3465 "threshold") \
3466 \
3467 product(intx, Tier3MinInvocationThreshold, 100, \
3468 "Minimum invocation to compile at tier 3") \
3469 \
3470 product(intx, Tier3CompileThreshold, 2000, \
3471 "Threshold at which tier 3 compilation is invoked (invocation " \
3472 "minimum must be satisfied") \
3473 \
3474 product(intx, Tier3BackEdgeThreshold, 60000, \
3475 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3476 \
3477 product(intx, Tier4InvocationThreshold, 5000, \
3478 "Compile if number of method invocations crosses this " \
3479 "threshold") \
3480 \
3481 product(intx, Tier4MinInvocationThreshold, 600, \
3482 "Minimum invocation to compile at tier 4") \
3483 \
3484 product(intx, Tier4CompileThreshold, 15000, \
3485 "Threshold at which tier 4 compilation is invoked (invocation " \
3486 "minimum must be satisfied") \
3487 \
3488 product(intx, Tier4BackEdgeThreshold, 40000, \
3489 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3490 \
3491 product(intx, Tier3DelayOn, 5, \
3492 "If C2 queue size grows over this amount per compiler thread " \
3493 "stop compiling at tier 3 and start compiling at tier 2") \
3494 \
3495 product(intx, Tier3DelayOff, 2, \
3496 "If C2 queue size is less than this amount per compiler thread " \
3497 "allow methods compiled at tier 2 transition to tier 3") \
3498 \
3499 product(intx, Tier3LoadFeedback, 5, \
3500 "Tier 3 thresholds will increase twofold when C1 queue size " \
3501 "reaches this amount per compiler thread") \
3502 \
3503 product(intx, Tier4LoadFeedback, 3, \
3504 "Tier 4 thresholds will increase twofold when C2 queue size " \
3505 "reaches this amount per compiler thread") \
3506 \
3507 product(intx, TieredCompileTaskTimeout, 50, \
3508 "Kill compile task if method was not used within " \
3509 "given timeout in milliseconds") \
3510 \
3511 product(intx, TieredStopAtLevel, 4, \
3512 "Stop at given compilation level") \
3513 \
3514 product(intx, Tier0ProfilingStartPercentage, 200, \
3515 "Start profiling in interpreter if the counters exceed tier 3 " \
3516 "thresholds by the specified percentage") \
3517 \
3518 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3519 "Increase the compile threshold for C1 compilation if the code " \
3520 "cache is filled by the specified percentage") \
3521 \
3522 product(intx, TieredRateUpdateMinTime, 1, \
3523 "Minimum rate sampling interval (in milliseconds)") \
3524 \
3525 product(intx, TieredRateUpdateMaxTime, 25, \
3526 "Maximum rate sampling interval (in milliseconds)") \
3527 \
3528 product_pd(bool, TieredCompilation, \
3529 "Enable tiered compilation") \
3530 \
3531 product(bool, PrintTieredEvents, false, \
3532 "Print tiered events notifications") \
3533 \
3534 product_pd(intx, OnStackReplacePercentage, \
3535 "NON_TIERED number of method invocations/branches (expressed as " \
3536 "% of CompileThreshold) before (re-)compiling OSR code") \
3537 \
3538 product(intx, InterpreterProfilePercentage, 33, \
3539 "NON_TIERED number of method invocations/branches (expressed as " \
3540 "% of CompileThreshold) before profiling in the interpreter") \
3541 \
3542 develop(intx, MaxRecompilationSearchLength, 10, \
3543 "The maximum number of frames to inspect when searching for " \
3544 "recompilee") \
3545 \
3546 develop(intx, MaxInterpretedSearchLength, 3, \
3547 "The maximum number of interpreted frames to skip when searching "\
3548 "for recompilee") \
3549 \
3550 develop(intx, DesiredMethodLimit, 8000, \
3551 "The desired maximum method size (in bytecodes) after inlining") \
3552 \
3553 develop(intx, HugeMethodLimit, 8000, \
3554 "Don't compile methods larger than this if " \
3555 "+DontCompileHugeMethods") \
3556 \
3557 /* New JDK 1.4 reflection implementation */ \
3558 \
3559 develop(bool, UseNewReflection, true, \
3560 "Temporary flag for transition to reflection based on dynamic " \
3561 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3562 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3563 "changes were needed") \
3564 \
3565 develop(bool, VerifyReflectionBytecodes, false, \
3566 "Force verification of 1.4 reflection bytecodes. Does not work " \
3567 "in situations like that described in 4486457 or for " \
3568 "constructors generated for serialization, so can not be enabled "\
3569 "in product.") \
3570 \
3571 product(bool, ReflectionWrapResolutionErrors, true, \
3572 "Temporary flag for transition to AbstractMethodError wrapped " \
3573 "in InvocationTargetException. See 6531596") \
3574 \
3575 develop(bool, VerifyLambdaBytecodes, false, \
3576 "Force verification of jdk 8 lambda metafactory bytecodes") \
3577 \
3578 develop(intx, FastSuperclassLimit, 8, \
3579 "Depth of hardwired instanceof accelerator array") \
3580 \
3581 /* Properties for Java libraries */ \
3582 \
3583 product(uintx, MaxDirectMemorySize, 0, \
3584 "Maximum total size of NIO direct-buffer allocations") \
3585 \
3586 /* temporary developer defined flags */ \
3587 \
3588 diagnostic(bool, UseNewCode, false, \
3589 "Testing Only: Use the new version while testing") \
3590 \
3591 diagnostic(bool, UseNewCode2, false, \
3592 "Testing Only: Use the new version while testing") \
3593 \
3594 diagnostic(bool, UseNewCode3, false, \
3595 "Testing Only: Use the new version while testing") \
3596 \
3597 /* flags for performance data collection */ \
3598 \
3599 product(bool, UsePerfData, falseInEmbedded, \
3600 "Flag to disable jvmstat instrumentation for performance testing "\
3601 "and problem isolation purposes") \
3602 \
3603 product(bool, PerfDataSaveToFile, false, \
3604 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3605 \
3606 product(ccstr, PerfDataSaveFile, NULL, \
3607 "Save PerfData memory to the specified absolute pathname. " \
3608 "The string %p in the file name (if present) " \
3609 "will be replaced by pid") \
3610 \
3611 product(intx, PerfDataSamplingInterval, 50, \
3612 "Data sampling interval (in milliseconds)") \
3613 \
3614 develop(bool, PerfTraceDataCreation, false, \
3615 "Trace creation of Performance Data Entries") \
3616 \
3617 develop(bool, PerfTraceMemOps, false, \
3618 "Trace PerfMemory create/attach/detach calls") \
3619 \
3620 product(bool, PerfDisableSharedMem, false, \
3621 "Store performance data in standard memory") \
3622 \
3623 product(intx, PerfDataMemorySize, 32*K, \
3624 "Size of performance data memory region. Will be rounded " \
3625 "up to a multiple of the native os page size.") \
3626 \
3627 product(intx, PerfMaxStringConstLength, 1024, \
3628 "Maximum PerfStringConstant string length before truncation") \
3629 \
3630 product(bool, PerfAllowAtExitRegistration, false, \
3631 "Allow registration of atexit() methods") \
3632 \
3633 product(bool, PerfBypassFileSystemCheck, false, \
3634 "Bypass Win32 file system criteria checks (Windows Only)") \
3635 \
3636 product(intx, UnguardOnExecutionViolation, 0, \
3637 "Unguard page and retry on no-execute fault (Win32 only) " \
3638 "0=off, 1=conservative, 2=aggressive") \
3639 \
3640 /* Serviceability Support */ \
3641 \
3642 product(bool, ManagementServer, false, \
3643 "Create JMX Management Server") \
3644 \
3645 product(bool, DisableAttachMechanism, false, \
3646 "Disable mechanism that allows tools to attach to this VM") \
3647 \
3648 product(bool, StartAttachListener, false, \
3649 "Always start Attach Listener at VM startup") \
3650 \
3651 manageable(bool, PrintConcurrentLocks, false, \
3652 "Print java.util.concurrent locks in thread dump") \
3653 \
3654 product(bool, TransmitErrorReport, false, \
3655 "Enable error report transmission on erroneous termination") \
3656 \
3657 product(ccstr, ErrorReportServer, NULL, \
3658 "Override built-in error report server address") \
3659 \
3660 /* Shared spaces */ \
3661 \
3662 product(bool, UseSharedSpaces, true, \
3663 "Use shared spaces for metadata") \
3664 \
3665 product(bool, RequireSharedSpaces, false, \
3666 "Require shared spaces for metadata") \
3667 \
3668 product(bool, DumpSharedSpaces, false, \
3669 "Special mode: JVM reads a class list, loads classes, builds " \
3670 "shared spaces, and dumps the shared spaces to a file to be " \
3671 "used in future JVM runs") \
3672 \
3673 product(bool, PrintSharedSpaces, false, \
3674 "Print usage of shared spaces") \
3675 \
3676 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3677 "Size of read-write space for metadata (in bytes)") \
3678 \
3679 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3680 "Size of read-only space for metadata (in bytes)") \
3681 \
3682 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3683 "Size of the shared miscellaneous data area (in bytes)") \
3684 \
3685 product(uintx, SharedMiscCodeSize, 120*K, \
3686 "Size of the shared miscellaneous code area (in bytes)") \
3687 \
3688 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3689 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3690 "Address to allocate shared memory region for class data") \
3691 \
3692 diagnostic(bool, EnableInvokeDynamic, true, \
3693 "support JSR 292 (method handles, invokedynamic, " \
3694 "anonymous classes") \
3695 \
3696 diagnostic(bool, PrintMethodHandleStubs, false, \
3697 "Print generated stub code for method handles") \
3698 \
3699 develop(bool, TraceMethodHandles, false, \
3700 "trace internal method handle operations") \
3701 \
3702 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3703 "perform extra checks when constructing method handles") \
3704 \
3705 diagnostic(bool, ShowHiddenFrames, false, \
3706 "show method handle implementation frames (usually hidden)") \
3707 \
3708 experimental(bool, TrustFinalNonStaticFields, false, \
3709 "trust final non-static declarations for constant folding") \
3710 \
3711 experimental(bool, FoldStableValues, false, \
3712 "Private flag to control optimizations for stable variables") \
3713 \
3714 develop(bool, TraceInvokeDynamic, false, \
3715 "trace internal invoke dynamic operations") \
3716 \
3717 diagnostic(bool, PauseAtStartup, false, \
3718 "Causes the VM to pause at startup time and wait for the pause " \
3719 "file to be removed (default: ./vm.paused.<pid>)") \
3720 \
3721 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3722 "The file to create and for whose removal to await when pausing " \
3723 "at startup. (default: ./vm.paused.<pid>)") \
3724 \
3725 diagnostic(bool, PauseAtExit, false, \
3726 "Pause and wait for keypress on exit if a debugger is attached") \
3727 \
3728 product(bool, ExtendedDTraceProbes, false, \
3729 "Enable performance-impacting dtrace probes") \
3730 \
3731 product(bool, DTraceMethodProbes, false, \
3732 "Enable dtrace probes for method-entry and method-exit") \
3733 \
3734 product(bool, DTraceAllocProbes, false, \
3735 "Enable dtrace probes for object allocation") \
3736 \
3737 product(bool, DTraceMonitorProbes, false, \
3738 "Enable dtrace probes for monitor events") \
3739 \
3740 product(bool, RelaxAccessControlCheck, false, \
3741 "Relax the access control checks in the verifier") \
3742 \
3743 diagnostic(bool, PrintDTraceDOF, false, \
3744 "Print the DTrace DOF passed to the system for JSDT probes") \
3745 \
3746 product(uintx, StringTableSize, defaultStringTableSize, \
3747 "Number of buckets in the interned String table") \
3748 \
3749 develop(bool, TraceDefaultMethods, false, \
3750 "Trace the default method processing steps") \
3751 \
3752 develop(bool, VerifyGenericSignatures, false, \
3753 "Abort VM on erroneous or inconsistent generic signatures") \
3754 \
3755 product(bool, UseVMInterruptibleIO, false, \
3756 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3757 "EINTR for I/O operations results in OS_INTRPT. The default " \
3758 "value of this flag is true for JDK 6 and earlier") \
3759 \
3760 diagnostic(bool, WhiteBoxAPI, false, \
3761 "Enable internal testing APIs") \
3762 \
3763 product(bool, PrintGCCause, true, \
3764 "Include GC cause in GC logging") \
3765 \
3766 product(bool , AllowNonVirtualCalls, false, \
3767 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3768 \
3769 diagnostic(ccstr, SharedArchiveFile, NULL, \
3770 "Override the default location of the CDS archive file") \
3771 \
3772 experimental(uintx, ArrayAllocatorMallocLimit, \
3773 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3774 "Allocation less than this value will be allocated " \
3775 "using malloc. Larger allocations will use mmap.") \
3776 \
3777 product(bool, EnableTracing, false, \
3778 "Enable event-based tracing") \
3779 \
3780 product(bool, UseLockedTracing, false, \
3781 "Use locked-tracing when doing event-based tracing")
3784 /*
3785 * Macros for factoring of globals
3786 */
3788 // Interface macros
3789 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3790 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3791 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3792 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3793 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3794 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3795 #ifdef PRODUCT
3796 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3797 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3798 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3799 #else
3800 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3801 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3802 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3803 #endif
3804 // Special LP64 flags, product only needed for now.
3805 #ifdef _LP64
3806 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3807 #else
3808 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3809 #endif // _LP64
3811 // Implementation macros
3812 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3813 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3814 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3815 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3816 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3817 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3818 #ifdef PRODUCT
3819 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3820 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3821 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3822 #else
3823 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3824 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3825 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3826 #endif
3827 #ifdef _LP64
3828 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3829 #else
3830 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3831 #endif // _LP64
3833 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3835 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3837 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3839 // Extensions
3841 #include "runtime/globals_ext.hpp"
3843 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
