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src/share/vm/runtime/globals.hpp@63147986a428
src/share/vm/runtime/globals.hpp
Wed, 18 Sep 2013 07:02:10 -0700
- author
- dcubed
- date
- Wed, 18 Sep 2013 07:02:10 -0700
- changeset 5743
- 63147986a428
- parent 5658
- edb5ab0f3fe5
- child 5755
- 0f37d1badced
- permissions
- -rw-r--r--
8019835: Strings interned in different threads equal but does not ==
Summary: Add -XX:+VerifyStringTableAtExit option and code to verify StringTable invariants.
Reviewed-by: rdurbin, sspitsyn, coleenp
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, UseCompressedKlassPointers, false, \
447 "Use 32-bit klass 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 "Whether to 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 features")\
490 \
491 product(bool, JavaMonitorsInStackTrace, true, \
492 "Print info. about Java monitor locks when the stacks are dumped")\
493 \
494 product_pd(bool, UseLargePages, \
495 "Use large page memory") \
496 \
497 product_pd(bool, UseLargePagesIndividualAllocation, \
498 "Allocate large pages individually for better affinity") \
499 \
500 develop(bool, LargePagesIndividualAllocationInjectError, false, \
501 "Fail large pages individual allocation") \
502 \
503 develop(bool, TracePageSizes, false, \
504 "Trace page size selection and usage.") \
505 \
506 product(bool, UseNUMA, false, \
507 "Use NUMA if available") \
508 \
509 product(bool, UseNUMAInterleaving, false, \
510 "Interleave memory across NUMA nodes if available") \
511 \
512 product(uintx, NUMAInterleaveGranularity, 2*M, \
513 "Granularity to use for NUMA interleaving on Windows OS") \
514 \
515 product(bool, ForceNUMA, false, \
516 "Force NUMA optimizations on single-node/UMA systems") \
517 \
518 product(uintx, NUMAChunkResizeWeight, 20, \
519 "Percentage (0-100) used to weigh the current sample when " \
520 "computing exponentially decaying average for " \
521 "AdaptiveNUMAChunkSizing") \
522 \
523 product(uintx, NUMASpaceResizeRate, 1*G, \
524 "Do not reallocate more that this amount per collection") \
525 \
526 product(bool, UseAdaptiveNUMAChunkSizing, true, \
527 "Enable adaptive chunk sizing for NUMA") \
528 \
529 product(bool, NUMAStats, false, \
530 "Print NUMA stats in detailed heap information") \
531 \
532 product(uintx, NUMAPageScanRate, 256, \
533 "Maximum number of pages to include in the page scan procedure") \
534 \
535 product_pd(bool, NeedsDeoptSuspend, \
536 "True for register window machines (sparc/ia64)") \
537 \
538 product(intx, UseSSE, 99, \
539 "Highest supported SSE instructions set on x86/x64") \
540 \
541 product(bool, UseAES, false, \
542 "Control whether AES instructions can be used on x86/x64") \
543 \
544 product(uintx, LargePageSizeInBytes, 0, \
545 "Large page size (0 to let VM choose the page size") \
546 \
547 product(uintx, LargePageHeapSizeThreshold, 128*M, \
548 "Use large pages if max heap is at least this big") \
549 \
550 product(bool, ForceTimeHighResolution, false, \
551 "Using high time resolution(For Win32 only)") \
552 \
553 develop(bool, TraceItables, false, \
554 "Trace initialization and use of itables") \
555 \
556 develop(bool, TracePcPatching, false, \
557 "Trace usage of frame::patch_pc") \
558 \
559 develop(bool, TraceJumps, false, \
560 "Trace assembly jumps in thread ring buffer") \
561 \
562 develop(bool, TraceRelocator, false, \
563 "Trace the bytecode relocator") \
564 \
565 develop(bool, TraceLongCompiles, false, \
566 "Print out every time compilation is longer than " \
567 "a given threashold") \
568 \
569 develop(bool, SafepointALot, false, \
570 "Generates a lot of safepoints. Works with " \
571 "GuaranteedSafepointInterval") \
572 \
573 product_pd(bool, BackgroundCompilation, \
574 "A thread requesting compilation is not blocked during " \
575 "compilation") \
576 \
577 product(bool, PrintVMQWaitTime, false, \
578 "Prints out the waiting time in VM operation queue") \
579 \
580 develop(bool, NoYieldsInMicrolock, false, \
581 "Disable yields in microlock") \
582 \
583 develop(bool, TraceOopMapGeneration, false, \
584 "Shows oopmap generation") \
585 \
586 product(bool, MethodFlushing, true, \
587 "Reclamation of zombie and not-entrant methods") \
588 \
589 develop(bool, VerifyStack, false, \
590 "Verify stack of each thread when it is entering a runtime call") \
591 \
592 diagnostic(bool, ForceUnreachable, false, \
593 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
594 \
595 notproduct(bool, StressDerivedPointers, false, \
596 "Force scavenge when a derived pointers is detected on stack " \
597 "after rtm call") \
598 \
599 develop(bool, TraceDerivedPointers, false, \
600 "Trace traversal of derived pointers on stack") \
601 \
602 notproduct(bool, TraceCodeBlobStacks, false, \
603 "Trace stack-walk of codeblobs") \
604 \
605 product(bool, PrintJNIResolving, false, \
606 "Used to implement -v:jni") \
607 \
608 notproduct(bool, PrintRewrites, false, \
609 "Print methods that are being rewritten") \
610 \
611 product(bool, UseInlineCaches, true, \
612 "Use Inline Caches for virtual calls ") \
613 \
614 develop(bool, InlineArrayCopy, true, \
615 "inline arraycopy native that is known to be part of " \
616 "base library DLL") \
617 \
618 develop(bool, InlineObjectHash, true, \
619 "inline Object::hashCode() native that is known to be part " \
620 "of base library DLL") \
621 \
622 develop(bool, InlineNatives, true, \
623 "inline natives that are known to be part of base library DLL") \
624 \
625 develop(bool, InlineMathNatives, true, \
626 "inline SinD, CosD, etc.") \
627 \
628 develop(bool, InlineClassNatives, true, \
629 "inline Class.isInstance, etc") \
630 \
631 develop(bool, InlineThreadNatives, true, \
632 "inline Thread.currentThread, etc") \
633 \
634 develop(bool, InlineUnsafeOps, true, \
635 "inline memory ops (native methods) from sun.misc.Unsafe") \
636 \
637 product(bool, CriticalJNINatives, true, \
638 "check for critical JNI entry points") \
639 \
640 notproduct(bool, StressCriticalJNINatives, false, \
641 "Exercise register saving code in critical natives") \
642 \
643 product(bool, UseSSE42Intrinsics, false, \
644 "SSE4.2 versions of intrinsics") \
645 \
646 product(bool, UseAESIntrinsics, false, \
647 "use intrinsics for AES versions of crypto") \
648 \
649 product(bool, UseCRC32Intrinsics, false, \
650 "use intrinsics for java.util.zip.CRC32") \
651 \
652 develop(bool, TraceCallFixup, false, \
653 "traces all call fixups") \
654 \
655 develop(bool, DeoptimizeALot, false, \
656 "deoptimize at every exit from the runtime system") \
657 \
658 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
659 "a comma separated list of bcis to deoptimize at") \
660 \
661 product(bool, DeoptimizeRandom, false, \
662 "deoptimize random frames on random exit from the runtime system")\
663 \
664 notproduct(bool, ZombieALot, false, \
665 "creates zombies (non-entrant) at exit from the runt. system") \
666 \
667 product(bool, UnlinkSymbolsALot, false, \
668 "unlink unreferenced symbols from the symbol table at safepoints")\
669 \
670 notproduct(bool, WalkStackALot, false, \
671 "trace stack (no print) at every exit from the runtime system") \
672 \
673 product(bool, Debugging, false, \
674 "set when executing debug methods in debug.ccp " \
675 "(to prevent triggering assertions)") \
676 \
677 notproduct(bool, StrictSafepointChecks, trueInDebug, \
678 "Enable strict checks that safepoints cannot happen for threads " \
679 "that used No_Safepoint_Verifier") \
680 \
681 notproduct(bool, VerifyLastFrame, false, \
682 "Verify oops on last frame on entry to VM") \
683 \
684 develop(bool, TraceHandleAllocation, false, \
685 "Prints out warnings when suspicious many handles are allocated") \
686 \
687 product(bool, UseCompilerSafepoints, true, \
688 "Stop at safepoints in compiled code") \
689 \
690 product(bool, FailOverToOldVerifier, true, \
691 "fail over to old verifier when split verifier fails") \
692 \
693 develop(bool, ShowSafepointMsgs, false, \
694 "Show msg. about safepoint synch.") \
695 \
696 product(bool, SafepointTimeout, false, \
697 "Time out and warn or fail after SafepointTimeoutDelay " \
698 "milliseconds if failed to reach safepoint") \
699 \
700 develop(bool, DieOnSafepointTimeout, false, \
701 "Die upon failure to reach safepoint (see SafepointTimeout)") \
702 \
703 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
704 /* typically, at most a few retries are needed */ \
705 product(intx, SuspendRetryCount, 50, \
706 "Maximum retry count for an external suspend request") \
707 \
708 product(intx, SuspendRetryDelay, 5, \
709 "Milliseconds to delay per retry (* current_retry_count)") \
710 \
711 product(bool, AssertOnSuspendWaitFailure, false, \
712 "Assert/Guarantee on external suspend wait failure") \
713 \
714 product(bool, TraceSuspendWaitFailures, false, \
715 "Trace external suspend wait failures") \
716 \
717 product(bool, MaxFDLimit, true, \
718 "Bump the number of file descriptors to max in solaris.") \
719 \
720 diagnostic(bool, LogEvents, true, \
721 "Enable the various ring buffer event logs") \
722 \
723 diagnostic(uintx, LogEventsBufferEntries, 10, \
724 "Enable the various ring buffer event logs") \
725 \
726 product(bool, BytecodeVerificationRemote, true, \
727 "Enables the Java bytecode verifier for remote classes") \
728 \
729 product(bool, BytecodeVerificationLocal, false, \
730 "Enables the Java bytecode verifier for local classes") \
731 \
732 develop(bool, ForceFloatExceptions, trueInDebug, \
733 "Force exceptions on FP stack under/overflow") \
734 \
735 develop(bool, VerifyStackAtCalls, false, \
736 "Verify that the stack pointer is unchanged after calls") \
737 \
738 develop(bool, TraceJavaAssertions, false, \
739 "Trace java language assertions") \
740 \
741 notproduct(bool, CheckAssertionStatusDirectives, false, \
742 "temporary - see javaClasses.cpp") \
743 \
744 notproduct(bool, PrintMallocFree, false, \
745 "Trace calls to C heap malloc/free allocation") \
746 \
747 product(bool, PrintOopAddress, false, \
748 "Always print the location of the oop") \
749 \
750 notproduct(bool, VerifyCodeCacheOften, false, \
751 "Verify compiled-code cache often") \
752 \
753 develop(bool, ZapDeadCompiledLocals, false, \
754 "Zap dead locals in compiler frames") \
755 \
756 notproduct(bool, ZapDeadLocalsOld, false, \
757 "Zap dead locals (old version, zaps all frames when " \
758 "entering the VM") \
759 \
760 notproduct(bool, CheckOopishValues, false, \
761 "Warn if value contains oop ( requires ZapDeadLocals)") \
762 \
763 develop(bool, UseMallocOnly, false, \
764 "use only malloc/free for allocation (no resource area/arena)") \
765 \
766 develop(bool, PrintMalloc, false, \
767 "print all malloc/free calls") \
768 \
769 develop(bool, PrintMallocStatistics, false, \
770 "print malloc/free statistics") \
771 \
772 develop(bool, ZapResourceArea, trueInDebug, \
773 "Zap freed resource/arena space with 0xABABABAB") \
774 \
775 notproduct(bool, ZapVMHandleArea, trueInDebug, \
776 "Zap freed VM handle space with 0xBCBCBCBC") \
777 \
778 develop(bool, ZapJNIHandleArea, trueInDebug, \
779 "Zap freed JNI handle space with 0xFEFEFEFE") \
780 \
781 notproduct(bool, ZapStackSegments, trueInDebug, \
782 "Zap allocated/freed Stack segments with 0xFADFADED") \
783 \
784 develop(bool, ZapUnusedHeapArea, trueInDebug, \
785 "Zap unused heap space with 0xBAADBABE") \
786 \
787 develop(bool, TraceZapUnusedHeapArea, false, \
788 "Trace zapping of unused heap space") \
789 \
790 develop(bool, CheckZapUnusedHeapArea, false, \
791 "Check zapping of unused heap space") \
792 \
793 develop(bool, ZapFillerObjects, trueInDebug, \
794 "Zap filler objects with 0xDEAFBABE") \
795 \
796 develop(bool, PrintVMMessages, true, \
797 "Print vm messages on console") \
798 \
799 product(bool, PrintGCApplicationConcurrentTime, false, \
800 "Print the time the application has been running") \
801 \
802 product(bool, PrintGCApplicationStoppedTime, false, \
803 "Print the time the application has been stopped") \
804 \
805 diagnostic(bool, VerboseVerification, false, \
806 "Display detailed verification details") \
807 \
808 notproduct(uintx, ErrorHandlerTest, 0, \
809 "If > 0, provokes an error after VM initialization; the value" \
810 "determines which error to provoke. See test_error_handler()" \
811 "in debug.cpp.") \
812 \
813 develop(bool, Verbose, false, \
814 "Prints additional debugging information from other modes") \
815 \
816 develop(bool, PrintMiscellaneous, false, \
817 "Prints uncategorized debugging information (requires +Verbose)") \
818 \
819 develop(bool, WizardMode, false, \
820 "Prints much more debugging information") \
821 \
822 product(bool, ShowMessageBoxOnError, false, \
823 "Keep process alive on VM fatal error") \
824 \
825 product(bool, CreateMinidumpOnCrash, false, \
826 "Create minidump on VM fatal error") \
827 \
828 product_pd(bool, UseOSErrorReporting, \
829 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
830 \
831 product(bool, SuppressFatalErrorMessage, false, \
832 "Do NO Fatal Error report [Avoid deadlock]") \
833 \
834 product(ccstrlist, OnError, "", \
835 "Run user-defined commands on fatal error; see VMError.cpp " \
836 "for examples") \
837 \
838 product(ccstrlist, OnOutOfMemoryError, "", \
839 "Run user-defined commands on first java.lang.OutOfMemoryError") \
840 \
841 manageable(bool, HeapDumpBeforeFullGC, false, \
842 "Dump heap to file before any major stop-world GC") \
843 \
844 manageable(bool, HeapDumpAfterFullGC, false, \
845 "Dump heap to file after any major stop-world GC") \
846 \
847 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
848 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
849 \
850 manageable(ccstr, HeapDumpPath, NULL, \
851 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
852 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
853 "in the working directory)") \
854 \
855 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
856 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
857 "when the heap usage is larger than this") \
858 \
859 develop(uintx, HeapDumpSegmentSize, 1*G, \
860 "Approximate segment size when generating a segmented heap dump") \
861 \
862 develop(bool, BreakAtWarning, false, \
863 "Execute breakpoint upon encountering VM warning") \
864 \
865 develop(bool, TraceVMOperation, false, \
866 "Trace vm operations") \
867 \
868 develop(bool, UseFakeTimers, false, \
869 "Tells whether the VM should use system time or a fake timer") \
870 \
871 product(ccstr, NativeMemoryTracking, "off", \
872 "Native memory tracking options") \
873 \
874 diagnostic(bool, PrintNMTStatistics, false, \
875 "Print native memory tracking summary data if it is on") \
876 \
877 diagnostic(bool, AutoShutdownNMT, true, \
878 "Automatically shutdown native memory tracking under stress " \
879 "situation. When set to false, native memory tracking tries to " \
880 "stay alive at the expense of JVM performance") \
881 \
882 diagnostic(bool, LogCompilation, false, \
883 "Log compilation activity in detail to hotspot.log or LogFile") \
884 \
885 product(bool, PrintCompilation, false, \
886 "Print compilations") \
887 \
888 diagnostic(bool, TraceNMethodInstalls, false, \
889 "Trace nmethod intallation") \
890 \
891 diagnostic(intx, ScavengeRootsInCode, 2, \
892 "0: do not allow scavengable oops in the code cache; " \
893 "1: allow scavenging from the code cache; " \
894 "2: emit as many constants as the compiler can see") \
895 \
896 product(bool, AlwaysRestoreFPU, false, \
897 "Restore the FPU control word after every JNI call (expensive)") \
898 \
899 diagnostic(bool, PrintCompilation2, false, \
900 "Print additional statistics per compilation") \
901 \
902 diagnostic(bool, PrintAdapterHandlers, false, \
903 "Print code generated for i2c/c2i adapters") \
904 \
905 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
906 "Verify that i2c/c2i adapters are called properly") \
907 \
908 develop(bool, VerifyAdapterSharing, false, \
909 "Verify that the code for shared adapters is the equivalent") \
910 \
911 diagnostic(bool, PrintAssembly, false, \
912 "Print assembly code (using external disassembler.so)") \
913 \
914 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
915 "Options string passed to disassembler.so") \
916 \
917 diagnostic(bool, PrintNMethods, false, \
918 "Print assembly code for nmethods when generated") \
919 \
920 diagnostic(bool, PrintNativeNMethods, false, \
921 "Print assembly code for native nmethods when generated") \
922 \
923 develop(bool, PrintDebugInfo, false, \
924 "Print debug information for all nmethods when generated") \
925 \
926 develop(bool, PrintRelocations, false, \
927 "Print relocation information for all nmethods when generated") \
928 \
929 develop(bool, PrintDependencies, false, \
930 "Print dependency information for all nmethods when generated") \
931 \
932 develop(bool, PrintExceptionHandlers, false, \
933 "Print exception handler tables for all nmethods when generated") \
934 \
935 develop(bool, StressCompiledExceptionHandlers, false, \
936 "Exercise compiled exception handlers") \
937 \
938 develop(bool, InterceptOSException, false, \
939 "Starts debugger when an implicit OS (e.g., NULL) " \
940 "exception happens") \
941 \
942 product(bool, PrintCodeCache, false, \
943 "Print the code cache memory usage when exiting") \
944 \
945 develop(bool, PrintCodeCache2, false, \
946 "Print detailed usage info on the code cache when exiting") \
947 \
948 product(bool, PrintCodeCacheOnCompilation, false, \
949 "Print the code cache memory usage each time a method is compiled") \
950 \
951 diagnostic(bool, PrintStubCode, false, \
952 "Print generated stub code") \
953 \
954 product(bool, StackTraceInThrowable, true, \
955 "Collect backtrace in throwable when exception happens") \
956 \
957 product(bool, OmitStackTraceInFastThrow, true, \
958 "Omit backtraces for some 'hot' exceptions in optimized code") \
959 \
960 product(bool, ProfilerPrintByteCodeStatistics, false, \
961 "Prints byte code statictics when dumping profiler output") \
962 \
963 product(bool, ProfilerRecordPC, false, \
964 "Collects tick for each 16 byte interval of compiled code") \
965 \
966 product(bool, ProfileVM, false, \
967 "Profiles ticks that fall within VM (either in the VM Thread " \
968 "or VM code called through stubs)") \
969 \
970 product(bool, ProfileIntervals, false, \
971 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
972 \
973 notproduct(bool, ProfilerCheckIntervals, false, \
974 "Collect and print info on spacing of profiler ticks") \
975 \
976 develop(bool, PrintJVMWarnings, false, \
977 "Prints warnings for unimplemented JVM functions") \
978 \
979 product(bool, PrintWarnings, true, \
980 "Prints JVM warnings to output stream") \
981 \
982 notproduct(uintx, WarnOnStalledSpinLock, 0, \
983 "Prints warnings for stalled SpinLocks") \
984 \
985 product(bool, RegisterFinalizersAtInit, true, \
986 "Register finalizable objects at end of Object.<init> or " \
987 "after allocation") \
988 \
989 develop(bool, RegisterReferences, true, \
990 "Tells whether the VM should register soft/weak/final/phantom " \
991 "references") \
992 \
993 develop(bool, IgnoreRewrites, false, \
994 "Supress rewrites of bytecodes in the oopmap generator. " \
995 "This is unsafe!") \
996 \
997 develop(bool, PrintCodeCacheExtension, false, \
998 "Print extension of code cache") \
999 \
1000 develop(bool, UsePrivilegedStack, true, \
1001 "Enable the security JVM functions") \
1002 \
1003 develop(bool, ProtectionDomainVerification, true, \
1004 "Verifies protection domain before resolution in system " \
1005 "dictionary") \
1006 \
1007 product(bool, ClassUnloading, true, \
1008 "Do unloading of classes") \
1009 \
1010 develop(bool, DisableStartThread, false, \
1011 "Disable starting of additional Java threads " \
1012 "(for debugging only)") \
1013 \
1014 develop(bool, MemProfiling, false, \
1015 "Write memory usage profiling to log file") \
1016 \
1017 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1018 "Prints the system dictionary at exit") \
1019 \
1020 experimental(intx, PredictedLoadedClassCount, 0, \
1021 "Experimental: Tune loaded class cache starting size.") \
1022 \
1023 diagnostic(bool, UnsyncloadClass, false, \
1024 "Unstable: VM calls loadClass unsynchronized. Custom " \
1025 "class loader must call VM synchronized for findClass " \
1026 "and defineClass.") \
1027 \
1028 product(bool, AlwaysLockClassLoader, false, \
1029 "Require the VM to acquire the class loader lock before calling " \
1030 "loadClass() even for class loaders registering " \
1031 "as parallel capable") \
1032 \
1033 product(bool, AllowParallelDefineClass, false, \
1034 "Allow parallel defineClass requests for class loaders " \
1035 "registering as parallel capable") \
1036 \
1037 product(bool, MustCallLoadClassInternal, false, \
1038 "Call loadClassInternal() rather than loadClass()") \
1039 \
1040 product_pd(bool, DontYieldALot, \
1041 "Throw away obvious excess yield calls (for SOLARIS only)") \
1042 \
1043 product_pd(bool, ConvertSleepToYield, \
1044 "Converts sleep(0) to thread yield " \
1045 "(may be off for SOLARIS to improve GUI)") \
1046 \
1047 product(bool, ConvertYieldToSleep, false, \
1048 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1049 "behavior (SOLARIS only)") \
1050 \
1051 product(bool, UseBoundThreads, true, \
1052 "Bind user level threads to kernel threads (for SOLARIS only)") \
1053 \
1054 develop(bool, UseDetachedThreads, true, \
1055 "Use detached threads that are recycled upon termination " \
1056 "(for SOLARIS only)") \
1057 \
1058 product(bool, UseLWPSynchronization, true, \
1059 "Use LWP-based instead of libthread-based synchronization " \
1060 "(SPARC only)") \
1061 \
1062 product(ccstr, SyncKnobs, NULL, \
1063 "(Unstable) Various monitor synchronization tunables") \
1064 \
1065 product(intx, EmitSync, 0, \
1066 "(Unsafe,Unstable) " \
1067 " Controls emission of inline sync fast-path code") \
1068 \
1069 product(intx, MonitorBound, 0, "Bound Monitor population") \
1070 \
1071 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1072 \
1073 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1074 \
1075 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1076 \
1077 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1078 \
1079 product(intx, hashCode, 5, \
1080 "(Unstable) select hashCode generation algorithm" ) \
1081 \
1082 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1083 "(Unstable, Linux-specific)" \
1084 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1085 \
1086 product(bool, FilterSpuriousWakeups, true, \
1087 "Prevent spurious or premature wakeups from object.wait " \
1088 "(Solaris only)") \
1089 \
1090 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1091 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1092 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1093 \
1094 develop(bool, UsePthreads, false, \
1095 "Use pthread-based instead of libthread-based synchronization " \
1096 "(SPARC only)") \
1097 \
1098 product(bool, AdjustConcurrency, false, \
1099 "call thr_setconcurrency at thread create time to avoid " \
1100 "LWP starvation on MP systems (For Solaris Only)") \
1101 \
1102 product(bool, ReduceSignalUsage, false, \
1103 "Reduce the use of OS signals in Java and/or the VM") \
1104 \
1105 develop_pd(bool, ShareVtableStubs, \
1106 "Share vtable stubs (smaller code but worse branch prediction") \
1107 \
1108 develop(bool, LoadLineNumberTables, true, \
1109 "Tells whether the class file parser loads line number tables") \
1110 \
1111 develop(bool, LoadLocalVariableTables, true, \
1112 "Tells whether the class file parser loads local variable tables")\
1113 \
1114 develop(bool, LoadLocalVariableTypeTables, true, \
1115 "Tells whether the class file parser loads local variable type tables")\
1116 \
1117 product(bool, AllowUserSignalHandlers, false, \
1118 "Do not complain if the application installs signal handlers " \
1119 "(Solaris & Linux only)") \
1120 \
1121 product(bool, UseSignalChaining, true, \
1122 "Use signal-chaining to invoke signal handlers installed " \
1123 "by the application (Solaris & Linux only)") \
1124 \
1125 product(bool, UseAltSigs, false, \
1126 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1127 "internal signals (Solaris only)") \
1128 \
1129 product(bool, AllowJNIEnvProxy, false, \
1130 "Allow JNIEnv proxies for jdbx") \
1131 \
1132 product(bool, JNIDetachReleasesMonitors, true, \
1133 "JNI DetachCurrentThread releases monitors owned by thread") \
1134 \
1135 product(bool, RestoreMXCSROnJNICalls, false, \
1136 "Restore MXCSR when returning from JNI calls") \
1137 \
1138 product(bool, CheckJNICalls, false, \
1139 "Verify all arguments to JNI calls") \
1140 \
1141 product(bool, UseFastJNIAccessors, true, \
1142 "Use optimized versions of Get<Primitive>Field") \
1143 \
1144 product(bool, EagerXrunInit, false, \
1145 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1146 " but not all -Xrun libraries may support the state of the VM at this time") \
1147 \
1148 product(bool, PreserveAllAnnotations, false, \
1149 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1150 \
1151 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1152 "Number of OutOfMemoryErrors preallocated with backtrace") \
1153 \
1154 product(bool, LazyBootClassLoader, true, \
1155 "Enable/disable lazy opening of boot class path entries") \
1156 \
1157 product(bool, UseXMMForArrayCopy, false, \
1158 "Use SSE2 MOVQ instruction for Arraycopy") \
1159 \
1160 product(intx, FieldsAllocationStyle, 1, \
1161 "0 - type based with oops first, 1 - with oops last, " \
1162 "2 - oops in super and sub classes are together") \
1163 \
1164 product(bool, CompactFields, true, \
1165 "Allocate nonstatic fields in gaps between previous fields") \
1166 \
1167 notproduct(bool, PrintFieldLayout, false, \
1168 "Print field layout for each class") \
1169 \
1170 product(intx, ContendedPaddingWidth, 128, \
1171 "How many bytes to pad the fields/classes marked @Contended with")\
1172 \
1173 product(bool, EnableContended, true, \
1174 "Enable @Contended annotation support") \
1175 \
1176 product(bool, RestrictContended, true, \
1177 "Restrict @Contended to trusted classes") \
1178 \
1179 product(bool, UseBiasedLocking, true, \
1180 "Enable biased locking in JVM") \
1181 \
1182 product(intx, BiasedLockingStartupDelay, 4000, \
1183 "Number of milliseconds to wait before enabling biased locking") \
1184 \
1185 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1186 "Print statistics of biased locking in JVM") \
1187 \
1188 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1189 "Threshold of number of revocations per type to try to " \
1190 "rebias all objects in the heap of that type") \
1191 \
1192 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1193 "Threshold of number of revocations per type to permanently " \
1194 "revoke biases of all objects in the heap of that type") \
1195 \
1196 product(intx, BiasedLockingDecayTime, 25000, \
1197 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1198 "type after previous bulk rebias") \
1199 \
1200 /* tracing */ \
1201 \
1202 notproduct(bool, TraceRuntimeCalls, false, \
1203 "Trace run-time calls") \
1204 \
1205 develop(bool, TraceJNICalls, false, \
1206 "Trace JNI calls") \
1207 \
1208 notproduct(bool, TraceJVMCalls, false, \
1209 "Trace JVM calls") \
1210 \
1211 product(ccstr, TraceJVMTI, NULL, \
1212 "Trace flags for JVMTI functions and events") \
1213 \
1214 /* This option can change an EMCP method into an obsolete method. */ \
1215 /* This can affect tests that except specific methods to be EMCP. */ \
1216 /* This option should be used with caution. */ \
1217 product(bool, StressLdcRewrite, false, \
1218 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1219 \
1220 product(intx, TraceRedefineClasses, 0, \
1221 "Trace level for JVMTI RedefineClasses") \
1222 \
1223 develop(bool, StressMethodComparator, false, \
1224 "run the MethodComparator on all loaded methods") \
1225 \
1226 /* change to false by default sometime after Mustang */ \
1227 product(bool, VerifyMergedCPBytecodes, true, \
1228 "Verify bytecodes after RedefineClasses constant pool merging") \
1229 \
1230 develop(bool, TraceJNIHandleAllocation, false, \
1231 "Trace allocation/deallocation of JNI handle blocks") \
1232 \
1233 develop(bool, TraceThreadEvents, false, \
1234 "Trace all thread events") \
1235 \
1236 develop(bool, TraceBytecodes, false, \
1237 "Trace bytecode execution") \
1238 \
1239 develop(bool, TraceClassInitialization, false, \
1240 "Trace class initialization") \
1241 \
1242 develop(bool, TraceExceptions, false, \
1243 "Trace exceptions") \
1244 \
1245 develop(bool, TraceICs, false, \
1246 "Trace inline cache changes") \
1247 \
1248 notproduct(bool, TraceInvocationCounterOverflow, false, \
1249 "Trace method invocation counter overflow") \
1250 \
1251 develop(bool, TraceInlineCacheClearing, false, \
1252 "Trace clearing of inline caches in nmethods") \
1253 \
1254 develop(bool, TraceDependencies, false, \
1255 "Trace dependencies") \
1256 \
1257 develop(bool, VerifyDependencies, trueInDebug, \
1258 "Exercise and verify the compilation dependency mechanism") \
1259 \
1260 develop(bool, TraceNewOopMapGeneration, false, \
1261 "Trace OopMapGeneration") \
1262 \
1263 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1264 "Trace OopMapGeneration: print detailed cell states") \
1265 \
1266 develop(bool, TimeOopMap, false, \
1267 "Time calls to GenerateOopMap::compute_map() in sum") \
1268 \
1269 develop(bool, TimeOopMap2, false, \
1270 "Time calls to GenerateOopMap::compute_map() individually") \
1271 \
1272 develop(bool, TraceMonitorMismatch, false, \
1273 "Trace monitor matching failures during OopMapGeneration") \
1274 \
1275 develop(bool, TraceOopMapRewrites, false, \
1276 "Trace rewritting of method oops during oop map generation") \
1277 \
1278 develop(bool, TraceSafepoint, false, \
1279 "Trace safepoint operations") \
1280 \
1281 develop(bool, TraceICBuffer, false, \
1282 "Trace usage of IC buffer") \
1283 \
1284 develop(bool, TraceCompiledIC, false, \
1285 "Trace changes of compiled IC") \
1286 \
1287 notproduct(bool, TraceZapDeadLocals, false, \
1288 "Trace zapping dead locals") \
1289 \
1290 develop(bool, TraceStartupTime, false, \
1291 "Trace setup time") \
1292 \
1293 develop(bool, TraceProtectionDomainVerification, false, \
1294 "Trace protection domain verifcation") \
1295 \
1296 develop(bool, TraceClearedExceptions, false, \
1297 "Prints when an exception is forcibly cleared") \
1298 \
1299 product(bool, TraceClassResolution, false, \
1300 "Trace all constant pool resolutions (for debugging)") \
1301 \
1302 product(bool, TraceBiasedLocking, false, \
1303 "Trace biased locking in JVM") \
1304 \
1305 product(bool, TraceMonitorInflation, false, \
1306 "Trace monitor inflation in JVM") \
1307 \
1308 /* gc */ \
1309 \
1310 product(bool, UseSerialGC, false, \
1311 "Use the serial garbage collector") \
1312 \
1313 product(bool, UseG1GC, false, \
1314 "Use the Garbage-First garbage collector") \
1315 \
1316 product(bool, UseParallelGC, false, \
1317 "Use the Parallel Scavenge garbage collector") \
1318 \
1319 product(bool, UseParallelOldGC, false, \
1320 "Use the Parallel Old garbage collector") \
1321 \
1322 product(uintx, HeapMaximumCompactionInterval, 20, \
1323 "How often should we maximally compact the heap (not allowing " \
1324 "any dead space)") \
1325 \
1326 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1327 "The collection count for the first maximum compaction") \
1328 \
1329 product(bool, UseMaximumCompactionOnSystemGC, true, \
1330 "In the Parallel Old garbage collector maximum compaction for " \
1331 "a system GC") \
1332 \
1333 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1334 "The mean used by the par compact dead wood" \
1335 "limiter (a number between 0-100).") \
1336 \
1337 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1338 "The standard deviation used by the par compact dead wood" \
1339 "limiter (a number between 0-100).") \
1340 \
1341 product(uintx, ParallelGCThreads, 0, \
1342 "Number of parallel threads parallel gc will use") \
1343 \
1344 product(bool, UseDynamicNumberOfGCThreads, false, \
1345 "Dynamically choose the number of parallel threads " \
1346 "parallel gc will use") \
1347 \
1348 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1349 "Force dynamic selection of the number of" \
1350 "parallel threads parallel gc will use to aid debugging") \
1351 \
1352 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1353 "Size of heap (bytes) per GC thread used in calculating the " \
1354 "number of GC threads") \
1355 \
1356 product(bool, TraceDynamicGCThreads, false, \
1357 "Trace the dynamic GC thread usage") \
1358 \
1359 develop(bool, ParallelOldGCSplitALot, false, \
1360 "Provoke splitting (copying data from a young gen space to" \
1361 "multiple destination spaces)") \
1362 \
1363 develop(uintx, ParallelOldGCSplitInterval, 3, \
1364 "How often to provoke splitting a young gen space") \
1365 \
1366 product(uintx, ConcGCThreads, 0, \
1367 "Number of threads concurrent gc will use") \
1368 \
1369 product(uintx, YoungPLABSize, 4096, \
1370 "Size of young gen promotion labs (in HeapWords)") \
1371 \
1372 product(uintx, OldPLABSize, 1024, \
1373 "Size of old gen promotion labs (in HeapWords)") \
1374 \
1375 product(uintx, GCTaskTimeStampEntries, 200, \
1376 "Number of time stamp entries per gc worker thread") \
1377 \
1378 product(bool, AlwaysTenure, false, \
1379 "Always tenure objects in eden. (ParallelGC only)") \
1380 \
1381 product(bool, NeverTenure, false, \
1382 "Never tenure objects in eden, May tenure on overflow " \
1383 "(ParallelGC only)") \
1384 \
1385 product(bool, ScavengeBeforeFullGC, true, \
1386 "Scavenge youngest generation before each full GC, " \
1387 "used with UseParallelGC") \
1388 \
1389 develop(bool, ScavengeWithObjectsInToSpace, false, \
1390 "Allow scavenges to occur when to_space contains objects.") \
1391 \
1392 product(bool, UseConcMarkSweepGC, false, \
1393 "Use Concurrent Mark-Sweep GC in the old generation") \
1394 \
1395 product(bool, ExplicitGCInvokesConcurrent, false, \
1396 "A System.gc() request invokes a concurrent collection;" \
1397 " (effective only when UseConcMarkSweepGC)") \
1398 \
1399 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1400 "A System.gc() request invokes a concurrent collection and " \
1401 "also unloads classes during such a concurrent gc cycle " \
1402 "(effective only when UseConcMarkSweepGC)") \
1403 \
1404 product(bool, GCLockerInvokesConcurrent, false, \
1405 "The exit of a JNI CS necessitating a scavenge also" \
1406 " kicks off a bkgrd concurrent collection") \
1407 \
1408 product(uintx, GCLockerEdenExpansionPercent, 5, \
1409 "How much the GC can expand the eden by while the GC locker " \
1410 "is active (as a percentage)") \
1411 \
1412 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1413 "Number of times to retry allocations when" \
1414 " blocked by the GC locker") \
1415 \
1416 develop(bool, UseCMSAdaptiveFreeLists, true, \
1417 "Use Adaptive Free Lists in the CMS generation") \
1418 \
1419 develop(bool, UseAsyncConcMarkSweepGC, true, \
1420 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1421 \
1422 develop(bool, RotateCMSCollectionTypes, false, \
1423 "Rotate the CMS collections among concurrent and STW") \
1424 \
1425 product(bool, UseCMSBestFit, true, \
1426 "Use CMS best fit allocation strategy") \
1427 \
1428 product(bool, UseCMSCollectionPassing, true, \
1429 "Use passing of collection from background to foreground") \
1430 \
1431 product(bool, UseParNewGC, false, \
1432 "Use parallel threads in the new generation.") \
1433 \
1434 product(bool, ParallelGCVerbose, false, \
1435 "Verbose output for parallel GC.") \
1436 \
1437 product(uintx, ParallelGCBufferWastePct, 10, \
1438 "Wasted fraction of parallel allocation buffer.") \
1439 \
1440 diagnostic(bool, ParallelGCRetainPLAB, false, \
1441 "Retain parallel allocation buffers across scavenges; " \
1442 " -- disabled because this currently conflicts with " \
1443 " parallel card scanning under certain conditions ") \
1444 \
1445 product(uintx, TargetPLABWastePct, 10, \
1446 "Target wasted space in last buffer as percent of overall " \
1447 "allocation") \
1448 \
1449 product(uintx, PLABWeight, 75, \
1450 "Percentage (0-100) used to weight the current sample when" \
1451 "computing exponentially decaying average for ResizePLAB.") \
1452 \
1453 product(bool, ResizePLAB, true, \
1454 "Dynamically resize (survivor space) promotion labs") \
1455 \
1456 product(bool, PrintPLAB, false, \
1457 "Print (survivor space) promotion labs sizing decisions") \
1458 \
1459 product(intx, ParGCArrayScanChunk, 50, \
1460 "Scan a subset and push remainder, if array is bigger than this") \
1461 \
1462 product(bool, ParGCUseLocalOverflow, false, \
1463 "Instead of a global overflow list, use local overflow stacks") \
1464 \
1465 product(bool, ParGCTrimOverflow, true, \
1466 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1467 \
1468 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1469 "Whether we should simulate work queue overflow in ParNew") \
1470 \
1471 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1472 "An `interval' counter that determines how frequently " \
1473 "we simulate overflow; a smaller number increases frequency") \
1474 \
1475 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1476 "The desired number of objects to claim from the overflow list") \
1477 \
1478 diagnostic(uintx, ParGCStridesPerThread, 2, \
1479 "The number of strides per worker thread that we divide up the " \
1480 "card table scanning work into") \
1481 \
1482 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1483 "The number of cards in each chunk of the parallel chunks used " \
1484 "during card table scanning") \
1485 \
1486 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1487 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1488 "parallel GC.") \
1489 \
1490 product(uintx, OldPLABWeight, 50, \
1491 "Percentage (0-100) used to weight the current sample when" \
1492 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1493 \
1494 product(bool, ResizeOldPLAB, true, \
1495 "Dynamically resize (old gen) promotion labs") \
1496 \
1497 product(bool, PrintOldPLAB, false, \
1498 "Print (old gen) promotion labs sizing decisions") \
1499 \
1500 product(uintx, CMSOldPLABMin, 16, \
1501 "Min size of CMS gen promotion lab caches per worker per blksize")\
1502 \
1503 product(uintx, CMSOldPLABMax, 1024, \
1504 "Max size of CMS gen promotion lab caches per worker per blksize")\
1505 \
1506 product(uintx, CMSOldPLABNumRefills, 4, \
1507 "Nominal number of refills of CMS gen promotion lab cache" \
1508 " per worker per block size") \
1509 \
1510 product(bool, CMSOldPLABResizeQuicker, false, \
1511 "Whether to react on-the-fly during a scavenge to a sudden" \
1512 " change in block demand rate") \
1513 \
1514 product(uintx, CMSOldPLABToleranceFactor, 4, \
1515 "The tolerance of the phase-change detector for on-the-fly" \
1516 " PLAB resizing during a scavenge") \
1517 \
1518 product(uintx, CMSOldPLABReactivityFactor, 2, \
1519 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1520 " during a scavenge") \
1521 \
1522 product(bool, AlwaysPreTouch, false, \
1523 "It forces all freshly committed pages to be pre-touched.") \
1524 \
1525 product_pd(uintx, CMSYoungGenPerWorker, \
1526 "The maximum size of young gen chosen by default per GC worker " \
1527 "thread available") \
1528 \
1529 product(bool, CMSIncrementalMode, false, \
1530 "Whether CMS GC should operate in \"incremental\" mode") \
1531 \
1532 product(uintx, CMSIncrementalDutyCycle, 10, \
1533 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1534 "CMSIncrementalPacing is enabled, then this is just the initial" \
1535 "value") \
1536 \
1537 product(bool, CMSIncrementalPacing, true, \
1538 "Whether the CMS incremental mode duty cycle should be " \
1539 "automatically adjusted") \
1540 \
1541 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1542 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1543 "enabled (a percentage, 0-100)") \
1544 \
1545 product(uintx, CMSIncrementalSafetyFactor, 10, \
1546 "Percentage (0-100) used to add conservatism when computing the " \
1547 "duty cycle") \
1548 \
1549 product(uintx, CMSIncrementalOffset, 0, \
1550 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1551 " is shifted to the right within the period between young GCs") \
1552 \
1553 product(uintx, CMSExpAvgFactor, 50, \
1554 "Percentage (0-100) used to weight the current sample when" \
1555 "computing exponential averages for CMS statistics.") \
1556 \
1557 product(uintx, CMS_FLSWeight, 75, \
1558 "Percentage (0-100) used to weight the current sample when" \
1559 "computing exponentially decating averages for CMS FLS statistics.") \
1560 \
1561 product(uintx, CMS_FLSPadding, 1, \
1562 "The multiple of deviation from mean to use for buffering" \
1563 "against volatility in free list demand.") \
1564 \
1565 product(uintx, FLSCoalescePolicy, 2, \
1566 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1567 \
1568 product(bool, FLSAlwaysCoalesceLarge, false, \
1569 "CMS: Larger free blocks are always available for coalescing") \
1570 \
1571 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1572 "CMS: the smaller the percentage the greater the coalition force")\
1573 \
1574 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1575 "CMS: the factor by which to inflate estimated demand of small" \
1576 " block sizes to prevent coalescing with an adjoining block") \
1577 \
1578 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1579 "CMS: the factor by which to inflate estimated demand of large" \
1580 " block sizes to prevent coalescing with an adjoining block") \
1581 \
1582 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1583 "CMS: the factor by which to inflate estimated demand of small" \
1584 " block sizes to prevent splitting to supply demand for smaller" \
1585 " blocks") \
1586 \
1587 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1588 "CMS: the factor by which to inflate estimated demand of large" \
1589 " block sizes to prevent splitting to supply demand for smaller" \
1590 " blocks") \
1591 \
1592 product(bool, CMSExtrapolateSweep, false, \
1593 "CMS: cushion for block demand during sweep") \
1594 \
1595 product(uintx, CMS_SweepWeight, 75, \
1596 "Percentage (0-100) used to weight the current sample when " \
1597 "computing exponentially decaying average for inter-sweep " \
1598 "duration") \
1599 \
1600 product(uintx, CMS_SweepPadding, 1, \
1601 "The multiple of deviation from mean to use for buffering " \
1602 "against volatility in inter-sweep duration.") \
1603 \
1604 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1605 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1606 "duration exceeds this threhold in milliseconds") \
1607 \
1608 develop(bool, CMSTraceIncrementalMode, false, \
1609 "Trace CMS incremental mode") \
1610 \
1611 develop(bool, CMSTraceIncrementalPacing, false, \
1612 "Trace CMS incremental mode pacing computation") \
1613 \
1614 develop(bool, CMSTraceThreadState, false, \
1615 "Trace the CMS thread state (enable the trace_state() method)") \
1616 \
1617 product(bool, CMSClassUnloadingEnabled, true, \
1618 "Whether class unloading enabled when using CMS GC") \
1619 \
1620 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1621 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1622 " for which classes may not be unloaded") \
1623 \
1624 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1625 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1626 \
1627 product(bool, UseCMSCompactAtFullCollection, true, \
1628 "Use mark sweep compact at full collections") \
1629 \
1630 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1631 "Number of CMS full collection done before compaction if > 0") \
1632 \
1633 develop(intx, CMSDictionaryChoice, 0, \
1634 "Use BinaryTreeDictionary as default in the CMS generation") \
1635 \
1636 product(uintx, CMSIndexedFreeListReplenish, 4, \
1637 "Replenish an indexed free list with this number of chunks") \
1638 \
1639 product(bool, CMSReplenishIntermediate, true, \
1640 "Replenish all intermediate free-list caches") \
1641 \
1642 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1643 "When satisfying batched demand, split blocks from the " \
1644 "IndexedFreeList whose size is a multiple of requested size") \
1645 \
1646 product(bool, CMSLoopWarn, false, \
1647 "Warn in case of excessive CMS looping") \
1648 \
1649 develop(bool, CMSOverflowEarlyRestoration, false, \
1650 "Whether preserved marks should be restored early") \
1651 \
1652 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1653 "Size of marking stack") \
1654 \
1655 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1656 "Max size of marking stack") \
1657 \
1658 notproduct(bool, CMSMarkStackOverflowALot, false, \
1659 "Whether we should simulate frequent marking stack / work queue" \
1660 " overflow") \
1661 \
1662 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1663 "An `interval' counter that determines how frequently" \
1664 " we simulate overflow; a smaller number increases frequency") \
1665 \
1666 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1667 "(Temporary, subject to experimentation)" \
1668 "Maximum number of abortable preclean iterations, if > 0") \
1669 \
1670 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1671 "(Temporary, subject to experimentation)" \
1672 "Maximum time in abortable preclean in ms") \
1673 \
1674 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1675 "(Temporary, subject to experimentation)" \
1676 "Nominal minimum work per abortable preclean iteration") \
1677 \
1678 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1679 "(Temporary, subject to experimentation)" \
1680 " Time that we sleep between iterations when not given" \
1681 " enough work per iteration") \
1682 \
1683 product(uintx, CMSRescanMultiple, 32, \
1684 "Size (in cards) of CMS parallel rescan task") \
1685 \
1686 product(uintx, CMSConcMarkMultiple, 32, \
1687 "Size (in cards) of CMS concurrent MT marking task") \
1688 \
1689 product(bool, CMSAbortSemantics, false, \
1690 "Whether abort-on-overflow semantics is implemented") \
1691 \
1692 product(bool, CMSParallelInitialMarkEnabled, true, \
1693 "Use the parallel initial mark.") \
1694 \
1695 product(bool, CMSParallelRemarkEnabled, true, \
1696 "Whether parallel remark enabled (only if ParNewGC)") \
1697 \
1698 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1699 "Whether parallel remark of survivor space" \
1700 " enabled (effective only if CMSParallelRemarkEnabled)") \
1701 \
1702 product(bool, CMSPLABRecordAlways, true, \
1703 "Whether to always record survivor space PLAB bdries" \
1704 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1705 \
1706 product(bool, CMSEdenChunksRecordAlways, true, \
1707 "Whether to always record eden chunks used for " \
1708 "the parallel initial mark or remark of eden" ) \
1709 \
1710 product(bool, CMSPrintEdenSurvivorChunks, false, \
1711 "Print the eden and the survivor chunks used for the parallel " \
1712 "initial mark or remark of the eden/survivor spaces") \
1713 \
1714 product(bool, CMSConcurrentMTEnabled, true, \
1715 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1716 \
1717 product(bool, CMSPrecleaningEnabled, true, \
1718 "Whether concurrent precleaning enabled") \
1719 \
1720 product(uintx, CMSPrecleanIter, 3, \
1721 "Maximum number of precleaning iteration passes") \
1722 \
1723 product(uintx, CMSPrecleanNumerator, 2, \
1724 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1725 " ratio") \
1726 \
1727 product(uintx, CMSPrecleanDenominator, 3, \
1728 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1729 " ratio") \
1730 \
1731 product(bool, CMSPrecleanRefLists1, true, \
1732 "Preclean ref lists during (initial) preclean phase") \
1733 \
1734 product(bool, CMSPrecleanRefLists2, false, \
1735 "Preclean ref lists during abortable preclean phase") \
1736 \
1737 product(bool, CMSPrecleanSurvivors1, false, \
1738 "Preclean survivors during (initial) preclean phase") \
1739 \
1740 product(bool, CMSPrecleanSurvivors2, true, \
1741 "Preclean survivors during abortable preclean phase") \
1742 \
1743 product(uintx, CMSPrecleanThreshold, 1000, \
1744 "Don't re-iterate if #dirty cards less than this") \
1745 \
1746 product(bool, CMSCleanOnEnter, true, \
1747 "Clean-on-enter optimization for reducing number of dirty cards") \
1748 \
1749 product(uintx, CMSRemarkVerifyVariant, 1, \
1750 "Choose variant (1,2) of verification following remark") \
1751 \
1752 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1753 "If Eden used is below this value, don't try to schedule remark") \
1754 \
1755 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1756 "The Eden occupancy % at which to try and schedule remark pause") \
1757 \
1758 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1759 "Start sampling Eden top at least before yg occupancy reaches" \
1760 " 1/<ratio> of the size at which we plan to schedule remark") \
1761 \
1762 product(uintx, CMSSamplingGrain, 16*K, \
1763 "The minimum distance between eden samples for CMS (see above)") \
1764 \
1765 product(bool, CMSScavengeBeforeRemark, false, \
1766 "Attempt scavenge before the CMS remark step") \
1767 \
1768 develop(bool, CMSTraceSweeper, false, \
1769 "Trace some actions of the CMS sweeper") \
1770 \
1771 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1772 "Don't drain below this size per parallel worker/thief") \
1773 \
1774 manageable(intx, CMSWaitDuration, 2000, \
1775 "Time in milliseconds that CMS thread waits for young GC") \
1776 \
1777 develop(uintx, CMSCheckInterval, 1000, \
1778 "Interval in milliseconds that CMS thread checks if it " \
1779 "should start a collection cycle") \
1780 \
1781 product(bool, CMSYield, true, \
1782 "Yield between steps of concurrent mark & sweep") \
1783 \
1784 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1785 "Bitmap operations should process at most this many bits" \
1786 "between yields") \
1787 \
1788 product(bool, CMSDumpAtPromotionFailure, false, \
1789 "Dump useful information about the state of the CMS old " \
1790 " generation upon a promotion failure.") \
1791 \
1792 product(bool, CMSPrintChunksInDump, false, \
1793 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1794 " more detailed information about the free chunks.") \
1795 \
1796 product(bool, CMSPrintObjectsInDump, false, \
1797 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1798 " more detailed information about the allocated objects.") \
1799 \
1800 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1801 "Verify that all refs across the FLS boundary " \
1802 " are to valid objects") \
1803 \
1804 diagnostic(bool, FLSVerifyLists, false, \
1805 "Do lots of (expensive) FreeListSpace verification") \
1806 \
1807 diagnostic(bool, FLSVerifyIndexTable, false, \
1808 "Do lots of (expensive) FLS index table verification") \
1809 \
1810 develop(bool, FLSVerifyDictionary, false, \
1811 "Do lots of (expensive) FLS dictionary verification") \
1812 \
1813 develop(bool, VerifyBlockOffsetArray, false, \
1814 "Do (expensive!) block offset array verification") \
1815 \
1816 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1817 "Maintain _unallocated_block in BlockOffsetArray" \
1818 " (currently applicable only to CMS collector)") \
1819 \
1820 develop(bool, TraceCMSState, false, \
1821 "Trace the state of the CMS collection") \
1822 \
1823 product(intx, RefDiscoveryPolicy, 0, \
1824 "Whether reference-based(0) or referent-based(1)") \
1825 \
1826 product(bool, ParallelRefProcEnabled, false, \
1827 "Enable parallel reference processing whenever possible") \
1828 \
1829 product(bool, ParallelRefProcBalancingEnabled, true, \
1830 "Enable balancing of reference processing queues") \
1831 \
1832 product(uintx, CMSTriggerRatio, 80, \
1833 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1834 "allocated before a CMS collection cycle commences") \
1835 \
1836 product(uintx, CMSBootstrapOccupancy, 50, \
1837 "Percentage CMS generation occupancy at which to " \
1838 "initiate CMS collection for bootstrapping collection stats") \
1839 \
1840 product(intx, CMSInitiatingOccupancyFraction, -1, \
1841 "Percentage CMS generation occupancy to start a CMS collection " \
1842 "cycle. A negative value means that CMSTriggerRatio is used") \
1843 \
1844 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1845 "Percentage of the (entire) heap occupancy to start a " \
1846 "concurrent GC cycle. It is used by GCs that trigger a " \
1847 "concurrent GC cycle based on the occupancy of the entire heap, " \
1848 "not just one of the generations (e.g., G1). A value of 0 " \
1849 "denotes 'do constant GC cycles'.") \
1850 \
1851 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1852 "Only use occupancy as a crierion for starting a CMS collection") \
1853 \
1854 product(uintx, CMSIsTooFullPercentage, 98, \
1855 "An absolute ceiling above which CMS will always consider the " \
1856 "unloading of classes when class unloading is enabled") \
1857 \
1858 develop(bool, CMSTestInFreeList, false, \
1859 "Check if the coalesced range is already in the " \
1860 "free lists as claimed") \
1861 \
1862 notproduct(bool, CMSVerifyReturnedBytes, false, \
1863 "Check that all the garbage collected was returned to the " \
1864 "free lists.") \
1865 \
1866 notproduct(bool, ScavengeALot, false, \
1867 "Force scavenge at every Nth exit from the runtime system " \
1868 "(N=ScavengeALotInterval)") \
1869 \
1870 develop(bool, FullGCALot, false, \
1871 "Force full gc at every Nth exit from the runtime system " \
1872 "(N=FullGCALotInterval)") \
1873 \
1874 notproduct(bool, GCALotAtAllSafepoints, false, \
1875 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1876 \
1877 product(bool, PrintPromotionFailure, false, \
1878 "Print additional diagnostic information following " \
1879 " promotion failure") \
1880 \
1881 notproduct(bool, PromotionFailureALot, false, \
1882 "Use promotion failure handling on every youngest generation " \
1883 "collection") \
1884 \
1885 develop(uintx, PromotionFailureALotCount, 1000, \
1886 "Number of promotion failures occurring at ParGCAllocBuffer" \
1887 "refill attempts (ParNew) or promotion attempts " \
1888 "(other young collectors) ") \
1889 \
1890 develop(uintx, PromotionFailureALotInterval, 5, \
1891 "Total collections between promotion failures alot") \
1892 \
1893 experimental(uintx, WorkStealingSleepMillis, 1, \
1894 "Sleep time when sleep is used for yields") \
1895 \
1896 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1897 "Number of yields before a sleep is done during workstealing") \
1898 \
1899 experimental(uintx, WorkStealingHardSpins, 4096, \
1900 "Number of iterations in a spin loop between checks on " \
1901 "time out of hard spin") \
1902 \
1903 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1904 "Ratio of hard spins to calls to yield") \
1905 \
1906 develop(uintx, ObjArrayMarkingStride, 512, \
1907 "Number of ObjArray elements to push onto the marking stack" \
1908 "before pushing a continuation entry") \
1909 \
1910 develop(bool, MetadataAllocationFailALot, false, \
1911 "Fail metadata allocations at intervals controlled by " \
1912 "MetadataAllocationFailALotInterval") \
1913 \
1914 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1915 "metadata allocation failure alot interval") \
1916 \
1917 develop(bool, MetaDataDeallocateALot, false, \
1918 "Deallocation bunches of metadata at intervals controlled by " \
1919 "MetaDataAllocateALotInterval") \
1920 \
1921 develop(uintx, MetaDataDeallocateALotInterval, 100, \
1922 "Metadata deallocation alot interval") \
1923 \
1924 develop(bool, TraceMetadataChunkAllocation, false, \
1925 "Trace chunk metadata allocations") \
1926 \
1927 product(bool, TraceMetadataHumongousAllocation, false, \
1928 "Trace humongous metadata allocations") \
1929 \
1930 develop(bool, TraceMetavirtualspaceAllocation, false, \
1931 "Trace virtual space metadata allocations") \
1932 \
1933 notproduct(bool, ExecuteInternalVMTests, false, \
1934 "Enable execution of internal VM tests.") \
1935 \
1936 notproduct(bool, VerboseInternalVMTests, false, \
1937 "Turn on logging for internal VM tests.") \
1938 \
1939 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1940 \
1941 product_pd(bool, ResizeTLAB, \
1942 "Dynamically resize tlab size for threads") \
1943 \
1944 product(bool, ZeroTLAB, false, \
1945 "Zero out the newly created TLAB") \
1946 \
1947 product(bool, FastTLABRefill, true, \
1948 "Use fast TLAB refill code") \
1949 \
1950 product(bool, PrintTLAB, false, \
1951 "Print various TLAB related information") \
1952 \
1953 product(bool, TLABStats, true, \
1954 "Print various TLAB related information") \
1955 \
1956 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
1957 "Enable LowMemoryProtection")) \
1958 \
1959 product_pd(bool, NeverActAsServerClassMachine, \
1960 "Never act like a server-class machine") \
1961 \
1962 product(bool, AlwaysActAsServerClassMachine, false, \
1963 "Always act like a server-class machine") \
1964 \
1965 product_pd(uint64_t, MaxRAM, \
1966 "Real memory size (in bytes) used to set maximum heap size") \
1967 \
1968 product(uintx, ErgoHeapSizeLimit, 0, \
1969 "Maximum ergonomically set heap size (in bytes); zero means use " \
1970 "MaxRAM / MaxRAMFraction") \
1971 \
1972 product(uintx, MaxRAMFraction, 4, \
1973 "Maximum fraction (1/n) of real memory used for maximum heap " \
1974 "size") \
1975 \
1976 product(uintx, DefaultMaxRAMFraction, 4, \
1977 "Maximum fraction (1/n) of real memory used for maximum heap " \
1978 "size; deprecated: to be renamed to MaxRAMFraction") \
1979 \
1980 product(uintx, MinRAMFraction, 2, \
1981 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1982 "size on systems with small physical memory size") \
1983 \
1984 product(uintx, InitialRAMFraction, 64, \
1985 "Fraction (1/n) of real memory used for initial heap size") \
1986 \
1987 develop(uintx, MaxVirtMemFraction, 2, \
1988 "Maximum fraction (1/n) of virtual memory used for ergonomically" \
1989 "determining maximum heap size") \
1990 \
1991 product(bool, UseAutoGCSelectPolicy, false, \
1992 "Use automatic collection selection policy") \
1993 \
1994 product(uintx, AutoGCSelectPauseMillis, 5000, \
1995 "Automatic GC selection pause threshhold in ms") \
1996 \
1997 product(bool, UseAdaptiveSizePolicy, true, \
1998 "Use adaptive generation sizing policies") \
1999 \
2000 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2001 "Use adaptive survivor sizing policies") \
2002 \
2003 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2004 "Use adaptive young-old sizing policies at minor collections") \
2005 \
2006 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2007 "Use adaptive young-old sizing policies at major collections") \
2008 \
2009 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2010 "Use statistics from System.GC for adaptive size policy") \
2011 \
2012 product(bool, UseAdaptiveGCBoundary, false, \
2013 "Allow young-old boundary to move") \
2014 \
2015 develop(bool, TraceAdaptiveGCBoundary, false, \
2016 "Trace young-old boundary moves") \
2017 \
2018 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2019 "Resize the virtual spaces of the young or old generations") \
2020 \
2021 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2022 "Policy for changeing generation size for throughput goals") \
2023 \
2024 product(uintx, AdaptiveSizePausePolicy, 0, \
2025 "Policy for changing generation size for pause goals") \
2026 \
2027 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2028 "Adjust tenured generation to achive a minor pause goal") \
2029 \
2030 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2031 "Adjust young generation to achive a major pause goal") \
2032 \
2033 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2034 "Number of steps where heuristics is used before data is used") \
2035 \
2036 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2037 "Number of collections before the adaptive sizing is started") \
2038 \
2039 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2040 "Collection interval for printing information; zero means never") \
2041 \
2042 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2043 "Use adaptive minimum footprint as a goal") \
2044 \
2045 product(uintx, AdaptiveSizePolicyWeight, 10, \
2046 "Weight given to exponential resizing, between 0 and 100") \
2047 \
2048 product(uintx, AdaptiveTimeWeight, 25, \
2049 "Weight given to time in adaptive policy, between 0 and 100") \
2050 \
2051 product(uintx, PausePadding, 1, \
2052 "How much buffer to keep for pause time") \
2053 \
2054 product(uintx, PromotedPadding, 3, \
2055 "How much buffer to keep for promotion failure") \
2056 \
2057 product(uintx, SurvivorPadding, 3, \
2058 "How much buffer to keep for survivor overflow") \
2059 \
2060 product(uintx, ThresholdTolerance, 10, \
2061 "Allowed collection cost difference between generations") \
2062 \
2063 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2064 "If collection costs are within margin, reduce both by full " \
2065 "delta") \
2066 \
2067 product(uintx, YoungGenerationSizeIncrement, 20, \
2068 "Adaptive size percentage change in young generation") \
2069 \
2070 product(uintx, YoungGenerationSizeSupplement, 80, \
2071 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2072 \
2073 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2074 "Decay factor to YoungedGenerationSizeSupplement") \
2075 \
2076 product(uintx, TenuredGenerationSizeIncrement, 20, \
2077 "Adaptive size percentage change in tenured generation") \
2078 \
2079 product(uintx, TenuredGenerationSizeSupplement, 80, \
2080 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2081 \
2082 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2083 "Decay factor to TenuredGenerationSizeIncrement") \
2084 \
2085 product(uintx, MaxGCPauseMillis, max_uintx, \
2086 "Adaptive size policy maximum GC pause time goal in msec, " \
2087 "or (G1 Only) the max. GC time per MMU time slice") \
2088 \
2089 product(uintx, GCPauseIntervalMillis, 0, \
2090 "Time slice for MMU specification") \
2091 \
2092 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2093 "Adaptive size policy maximum GC minor pause time goal in msec") \
2094 \
2095 product(uintx, GCTimeRatio, 99, \
2096 "Adaptive size policy application time to GC time ratio") \
2097 \
2098 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2099 "Adaptive size scale down factor for shrinking") \
2100 \
2101 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2102 "Adaptive size decays the major cost for long major intervals") \
2103 \
2104 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2105 "Time scale over which major costs decay") \
2106 \
2107 product(uintx, MinSurvivorRatio, 3, \
2108 "Minimum ratio of young generation/survivor space size") \
2109 \
2110 product(uintx, InitialSurvivorRatio, 8, \
2111 "Initial ratio of eden/survivor space size") \
2112 \
2113 product(uintx, BaseFootPrintEstimate, 256*M, \
2114 "Estimate of footprint other than Java Heap") \
2115 \
2116 product(bool, UseGCOverheadLimit, true, \
2117 "Use policy to limit of proportion of time spent in GC " \
2118 "before an OutOfMemory error is thrown") \
2119 \
2120 product(uintx, GCTimeLimit, 98, \
2121 "Limit of proportion of time spent in GC before an OutOfMemory" \
2122 "error is thrown (used with GCHeapFreeLimit)") \
2123 \
2124 product(uintx, GCHeapFreeLimit, 2, \
2125 "Minimum percentage of free space after a full GC before an " \
2126 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2127 \
2128 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2129 "Number of consecutive collections before gc time limit fires") \
2130 \
2131 product(bool, PrintAdaptiveSizePolicy, false, \
2132 "Print information about AdaptiveSizePolicy") \
2133 \
2134 product(intx, PrefetchCopyIntervalInBytes, -1, \
2135 "How far ahead to prefetch destination area (<= 0 means off)") \
2136 \
2137 product(intx, PrefetchScanIntervalInBytes, -1, \
2138 "How far ahead to prefetch scan area (<= 0 means off)") \
2139 \
2140 product(intx, PrefetchFieldsAhead, -1, \
2141 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2142 \
2143 diagnostic(bool, VerifySilently, false, \
2144 "Don't print print the verification progress") \
2145 \
2146 diagnostic(bool, VerifyDuringStartup, false, \
2147 "Verify memory system before executing any Java code " \
2148 "during VM initialization") \
2149 \
2150 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2151 "Verify system before exiting") \
2152 \
2153 diagnostic(bool, VerifyBeforeGC, false, \
2154 "Verify memory system before GC") \
2155 \
2156 diagnostic(bool, VerifyAfterGC, false, \
2157 "Verify memory system after GC") \
2158 \
2159 diagnostic(bool, VerifyDuringGC, false, \
2160 "Verify memory system during GC (between phases)") \
2161 \
2162 diagnostic(bool, GCParallelVerificationEnabled, true, \
2163 "Enable parallel memory system verification") \
2164 \
2165 diagnostic(bool, DeferInitialCardMark, false, \
2166 "When +ReduceInitialCardMarks, explicitly defer any that " \
2167 "may arise from new_pre_store_barrier") \
2168 \
2169 diagnostic(bool, VerifyRememberedSets, false, \
2170 "Verify GC remembered sets") \
2171 \
2172 diagnostic(bool, VerifyObjectStartArray, true, \
2173 "Verify GC object start array if verify before/after") \
2174 \
2175 product(bool, DisableExplicitGC, false, \
2176 "Tells whether calling System.gc() does a full GC") \
2177 \
2178 notproduct(bool, CheckMemoryInitialization, false, \
2179 "Checks memory initialization") \
2180 \
2181 product(bool, CollectGen0First, false, \
2182 "Collect youngest generation before each full GC") \
2183 \
2184 diagnostic(bool, BindCMSThreadToCPU, false, \
2185 "Bind CMS Thread to CPU if possible") \
2186 \
2187 diagnostic(uintx, CPUForCMSThread, 0, \
2188 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2189 \
2190 product(bool, BindGCTaskThreadsToCPUs, false, \
2191 "Bind GCTaskThreads to CPUs if possible") \
2192 \
2193 product(bool, UseGCTaskAffinity, false, \
2194 "Use worker affinity when asking for GCTasks") \
2195 \
2196 product(uintx, ProcessDistributionStride, 4, \
2197 "Stride through processors when distributing processes") \
2198 \
2199 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2200 "number of times the coordinator GC thread will sleep while " \
2201 "yielding before giving up and resuming GC") \
2202 \
2203 product(uintx, CMSYieldSleepCount, 0, \
2204 "number of times a GC thread (minus the coordinator) " \
2205 "will sleep while yielding before giving up and resuming GC") \
2206 \
2207 /* gc tracing */ \
2208 manageable(bool, PrintGC, false, \
2209 "Print message at garbage collect") \
2210 \
2211 manageable(bool, PrintGCDetails, false, \
2212 "Print more details at garbage collect") \
2213 \
2214 manageable(bool, PrintGCDateStamps, false, \
2215 "Print date stamps at garbage collect") \
2216 \
2217 manageable(bool, PrintGCTimeStamps, false, \
2218 "Print timestamps at garbage collect") \
2219 \
2220 product(bool, PrintGCTaskTimeStamps, false, \
2221 "Print timestamps for individual gc worker thread tasks") \
2222 \
2223 develop(intx, ConcGCYieldTimeout, 0, \
2224 "If non-zero, assert that GC threads yield within this # of ms.") \
2225 \
2226 notproduct(bool, TraceMarkSweep, false, \
2227 "Trace mark sweep") \
2228 \
2229 product(bool, PrintReferenceGC, false, \
2230 "Print times spent handling reference objects during GC " \
2231 " (enabled only when PrintGCDetails)") \
2232 \
2233 develop(bool, TraceReferenceGC, false, \
2234 "Trace handling of soft/weak/final/phantom references") \
2235 \
2236 develop(bool, TraceFinalizerRegistration, false, \
2237 "Trace registration of final references") \
2238 \
2239 notproduct(bool, TraceScavenge, false, \
2240 "Trace scavenge") \
2241 \
2242 product_rw(bool, TraceClassLoading, false, \
2243 "Trace all classes loaded") \
2244 \
2245 product(bool, TraceClassLoadingPreorder, false, \
2246 "Trace all classes loaded in order referenced (not loaded)") \
2247 \
2248 product_rw(bool, TraceClassUnloading, false, \
2249 "Trace unloading of classes") \
2250 \
2251 product_rw(bool, TraceLoaderConstraints, false, \
2252 "Trace loader constraints") \
2253 \
2254 develop(bool, TraceClassLoaderData, false, \
2255 "Trace class loader loader_data lifetime") \
2256 \
2257 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2258 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2259 "Initial size of the boot class loader data metaspace") \
2260 \
2261 product(bool, TraceGen0Time, false, \
2262 "Trace accumulated time for Gen 0 collection") \
2263 \
2264 product(bool, TraceGen1Time, false, \
2265 "Trace accumulated time for Gen 1 collection") \
2266 \
2267 product(bool, PrintTenuringDistribution, false, \
2268 "Print tenuring age information") \
2269 \
2270 product_rw(bool, PrintHeapAtGC, false, \
2271 "Print heap layout before and after each GC") \
2272 \
2273 product_rw(bool, PrintHeapAtGCExtended, false, \
2274 "Prints extended information about the layout of the heap " \
2275 "when -XX:+PrintHeapAtGC is set") \
2276 \
2277 product(bool, PrintHeapAtSIGBREAK, true, \
2278 "Print heap layout in response to SIGBREAK") \
2279 \
2280 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2281 "Print a class histogram before any major stop-world GC") \
2282 \
2283 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2284 "Print a class histogram after any major stop-world GC") \
2285 \
2286 manageable(bool, PrintClassHistogram, false, \
2287 "Print a histogram of class instances") \
2288 \
2289 develop(bool, TraceWorkGang, false, \
2290 "Trace activities of work gangs") \
2291 \
2292 product(bool, TraceParallelOldGCTasks, false, \
2293 "Trace multithreaded GC activity") \
2294 \
2295 develop(bool, TraceBlockOffsetTable, false, \
2296 "Print BlockOffsetTable maps") \
2297 \
2298 develop(bool, TraceCardTableModRefBS, false, \
2299 "Print CardTableModRefBS maps") \
2300 \
2301 develop(bool, TraceGCTaskManager, false, \
2302 "Trace actions of the GC task manager") \
2303 \
2304 develop(bool, TraceGCTaskQueue, false, \
2305 "Trace actions of the GC task queues") \
2306 \
2307 diagnostic(bool, TraceGCTaskThread, false, \
2308 "Trace actions of the GC task threads") \
2309 \
2310 product(bool, PrintParallelOldGCPhaseTimes, false, \
2311 "Print the time taken by each parallel old gc phase." \
2312 "PrintGCDetails must also be enabled.") \
2313 \
2314 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2315 "Trace parallel old gc marking phase") \
2316 \
2317 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2318 "Trace parallel old gc summary phase") \
2319 \
2320 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2321 "Trace parallel old gc compaction phase") \
2322 \
2323 develop(bool, TraceParallelOldGCDensePrefix, false, \
2324 "Trace parallel old gc dense prefix computation") \
2325 \
2326 develop(bool, IgnoreLibthreadGPFault, false, \
2327 "Suppress workaround for libthread GP fault") \
2328 \
2329 product(bool, PrintJNIGCStalls, false, \
2330 "Print diagnostic message when GC is stalled" \
2331 "by JNI critical section") \
2332 \
2333 experimental(double, ObjectCountCutOffPercent, 0.5, \
2334 "The percentage of the used heap that the instances of a class " \
2335 "must occupy for the class to generate a trace event.") \
2336 \
2337 /* GC log rotation setting */ \
2338 \
2339 product(bool, UseGCLogFileRotation, false, \
2340 "Prevent large gclog file for long running app. " \
2341 "Requires -Xloggc:<filename>") \
2342 \
2343 product(uintx, NumberOfGCLogFiles, 0, \
2344 "Number of gclog files in rotation, " \
2345 "Default: 0, no rotation") \
2346 \
2347 product(uintx, GCLogFileSize, 0, \
2348 "GC log file size, Default: 0 bytes, no rotation " \
2349 "Only valid with UseGCLogFileRotation") \
2350 \
2351 /* JVMTI heap profiling */ \
2352 \
2353 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2354 "Trace JVMTI object tagging calls") \
2355 \
2356 diagnostic(bool, VerifyBeforeIteration, false, \
2357 "Verify memory system before JVMTI iteration") \
2358 \
2359 /* compiler interface */ \
2360 \
2361 develop(bool, CIPrintCompilerName, false, \
2362 "when CIPrint is active, print the name of the active compiler") \
2363 \
2364 develop(bool, CIPrintCompileQueue, false, \
2365 "display the contents of the compile queue whenever a " \
2366 "compilation is enqueued") \
2367 \
2368 develop(bool, CIPrintRequests, false, \
2369 "display every request for compilation") \
2370 \
2371 product(bool, CITime, false, \
2372 "collect timing information for compilation") \
2373 \
2374 develop(bool, CITimeEach, false, \
2375 "display timing information after each successful compilation") \
2376 \
2377 develop(bool, CICountOSR, false, \
2378 "use a separate counter when assigning ids to osr compilations") \
2379 \
2380 develop(bool, CICompileNatives, true, \
2381 "compile native methods if supported by the compiler") \
2382 \
2383 develop_pd(bool, CICompileOSR, \
2384 "compile on stack replacement methods if supported by the " \
2385 "compiler") \
2386 \
2387 develop(bool, CIPrintMethodCodes, false, \
2388 "print method bytecodes of the compiled code") \
2389 \
2390 develop(bool, CIPrintTypeFlow, false, \
2391 "print the results of ciTypeFlow analysis") \
2392 \
2393 develop(bool, CITraceTypeFlow, false, \
2394 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2395 \
2396 develop(intx, OSROnlyBCI, -1, \
2397 "OSR only at this bci. Negative values mean exclude that bci") \
2398 \
2399 /* compiler */ \
2400 \
2401 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2402 "Number of compiler threads to run") \
2403 \
2404 product(intx, CompilationPolicyChoice, 0, \
2405 "which compilation policy (0/1)") \
2406 \
2407 develop(bool, UseStackBanging, true, \
2408 "use stack banging for stack overflow checks (required for " \
2409 "proper StackOverflow handling; disable only to measure cost " \
2410 "of stackbanging)") \
2411 \
2412 develop(bool, UseStrictFP, true, \
2413 "use strict fp if modifier strictfp is set") \
2414 \
2415 develop(bool, GenerateSynchronizationCode, true, \
2416 "generate locking/unlocking code for synchronized methods and " \
2417 "monitors") \
2418 \
2419 develop(bool, GenerateCompilerNullChecks, true, \
2420 "Generate explicit null checks for loads/stores/calls") \
2421 \
2422 develop(bool, GenerateRangeChecks, true, \
2423 "Generate range checks for array accesses") \
2424 \
2425 develop_pd(bool, ImplicitNullChecks, \
2426 "generate code for implicit null checks") \
2427 \
2428 product(bool, PrintSafepointStatistics, false, \
2429 "print statistics about safepoint synchronization") \
2430 \
2431 product(intx, PrintSafepointStatisticsCount, 300, \
2432 "total number of safepoint statistics collected " \
2433 "before printing them out") \
2434 \
2435 product(intx, PrintSafepointStatisticsTimeout, -1, \
2436 "print safepoint statistics only when safepoint takes" \
2437 " more than PrintSafepointSatisticsTimeout in millis") \
2438 \
2439 product(bool, TraceSafepointCleanupTime, false, \
2440 "print the break down of clean up tasks performed during" \
2441 " safepoint") \
2442 \
2443 product(bool, Inline, true, \
2444 "enable inlining") \
2445 \
2446 product(bool, ClipInlining, true, \
2447 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2448 \
2449 develop(bool, UseCHA, true, \
2450 "enable CHA") \
2451 \
2452 product(bool, UseTypeProfile, true, \
2453 "Check interpreter profile for historically monomorphic calls") \
2454 \
2455 notproduct(bool, TimeCompiler, false, \
2456 "time the compiler") \
2457 \
2458 diagnostic(bool, PrintInlining, false, \
2459 "prints inlining optimizations") \
2460 \
2461 product(bool, UsePopCountInstruction, false, \
2462 "Use population count instruction") \
2463 \
2464 develop(bool, EagerInitialization, false, \
2465 "Eagerly initialize classes if possible") \
2466 \
2467 develop(bool, TraceMethodReplacement, false, \
2468 "Print when methods are replaced do to recompilation") \
2469 \
2470 develop(bool, PrintMethodFlushing, false, \
2471 "print the nmethods being flushed") \
2472 \
2473 develop(bool, UseRelocIndex, false, \
2474 "use an index to speed random access to relocations") \
2475 \
2476 develop(bool, StressCodeBuffers, false, \
2477 "Exercise code buffer expansion and other rare state changes") \
2478 \
2479 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2480 "Generate extra debugging info for non-safepoints in nmethods") \
2481 \
2482 product(bool, PrintVMOptions, false, \
2483 "Print flags that appeared on the command line") \
2484 \
2485 product(bool, IgnoreUnrecognizedVMOptions, false, \
2486 "Ignore unrecognized VM options") \
2487 \
2488 product(bool, PrintCommandLineFlags, false, \
2489 "Print flags specified on command line or set by ergonomics") \
2490 \
2491 product(bool, PrintFlagsInitial, false, \
2492 "Print all VM flags before argument processing and exit VM") \
2493 \
2494 product(bool, PrintFlagsFinal, false, \
2495 "Print all VM flags after argument and ergonomic processing") \
2496 \
2497 notproduct(bool, PrintFlagsWithComments, false, \
2498 "Print all VM flags with default values and descriptions and exit")\
2499 \
2500 diagnostic(bool, SerializeVMOutput, true, \
2501 "Use a mutex to serialize output to tty and hotspot.log") \
2502 \
2503 diagnostic(bool, DisplayVMOutput, true, \
2504 "Display all VM output on the tty, independently of LogVMOutput") \
2505 \
2506 diagnostic(bool, LogVMOutput, trueInDebug, \
2507 "Save VM output to hotspot.log, or to LogFile") \
2508 \
2509 diagnostic(ccstr, LogFile, NULL, \
2510 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2511 \
2512 product(ccstr, ErrorFile, NULL, \
2513 "If an error occurs, save the error data to this file " \
2514 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2515 \
2516 product(bool, DisplayVMOutputToStderr, false, \
2517 "If DisplayVMOutput is true, display all VM output to stderr") \
2518 \
2519 product(bool, DisplayVMOutputToStdout, false, \
2520 "If DisplayVMOutput is true, display all VM output to stdout") \
2521 \
2522 product(bool, UseHeavyMonitors, false, \
2523 "use heavyweight instead of lightweight Java monitors") \
2524 \
2525 product(bool, PrintStringTableStatistics, false, \
2526 "print statistics about the StringTable and SymbolTable") \
2527 \
2528 diagnostic(bool, VerifyStringTableAtExit, false, \
2529 "verify StringTable contents at exit") \
2530 \
2531 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2532 "print histogram of the symbol table") \
2533 \
2534 notproduct(bool, ExitVMOnVerifyError, false, \
2535 "standard exit from VM if bytecode verify error " \
2536 "(only in debug mode)") \
2537 \
2538 notproduct(ccstr, AbortVMOnException, NULL, \
2539 "Call fatal if this exception is thrown. Example: " \
2540 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2541 \
2542 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2543 "Call fatal if the exception pointed by AbortVMOnException " \
2544 "has this message.") \
2545 \
2546 develop(bool, DebugVtables, false, \
2547 "add debugging code to vtable dispatch") \
2548 \
2549 develop(bool, PrintVtables, false, \
2550 "print vtables when printing klass") \
2551 \
2552 notproduct(bool, PrintVtableStats, false, \
2553 "print vtables stats at end of run") \
2554 \
2555 develop(bool, TraceCreateZombies, false, \
2556 "trace creation of zombie nmethods") \
2557 \
2558 notproduct(bool, IgnoreLockingAssertions, false, \
2559 "disable locking assertions (for speed)") \
2560 \
2561 product(bool, RangeCheckElimination, true, \
2562 "Eliminate range checks") \
2563 \
2564 develop_pd(bool, UncommonNullCast, \
2565 "track occurrences of null in casts; adjust compiler tactics") \
2566 \
2567 develop(bool, TypeProfileCasts, true, \
2568 "treat casts like calls for purposes of type profiling") \
2569 \
2570 develop(bool, DelayCompilationDuringStartup, true, \
2571 "Delay invoking the compiler until main application class is " \
2572 "loaded") \
2573 \
2574 develop(bool, CompileTheWorld, false, \
2575 "Compile all methods in all classes in bootstrap class path " \
2576 "(stress test)") \
2577 \
2578 develop(bool, CompileTheWorldPreloadClasses, true, \
2579 "Preload all classes used by a class before start loading") \
2580 \
2581 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2582 "Force a safepoint every n compiles so sweeper can keep up") \
2583 \
2584 develop(bool, FillDelaySlots, true, \
2585 "Fill delay slots (on SPARC only)") \
2586 \
2587 develop(bool, TimeLivenessAnalysis, false, \
2588 "Time computation of bytecode liveness analysis") \
2589 \
2590 develop(bool, TraceLivenessGen, false, \
2591 "Trace the generation of liveness analysis information") \
2592 \
2593 notproduct(bool, TraceLivenessQuery, false, \
2594 "Trace queries of liveness analysis information") \
2595 \
2596 notproduct(bool, CollectIndexSetStatistics, false, \
2597 "Collect information about IndexSets") \
2598 \
2599 develop(bool, UseLoopSafepoints, true, \
2600 "Generate Safepoint nodes in every loop") \
2601 \
2602 develop(intx, FastAllocateSizeLimit, 128*K, \
2603 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2604 "Inline allocations larger than this in doublewords must go slow")\
2605 \
2606 product(bool, AggressiveOpts, false, \
2607 "Enable aggressive optimizations - see arguments.cpp") \
2608 \
2609 /* statistics */ \
2610 develop(bool, CountCompiledCalls, false, \
2611 "counts method invocations") \
2612 \
2613 notproduct(bool, CountRuntimeCalls, false, \
2614 "counts VM runtime calls") \
2615 \
2616 develop(bool, CountJNICalls, false, \
2617 "counts jni method invocations") \
2618 \
2619 notproduct(bool, CountJVMCalls, false, \
2620 "counts jvm method invocations") \
2621 \
2622 notproduct(bool, CountRemovableExceptions, false, \
2623 "count exceptions that could be replaced by branches due to " \
2624 "inlining") \
2625 \
2626 notproduct(bool, ICMissHistogram, false, \
2627 "produce histogram of IC misses") \
2628 \
2629 notproduct(bool, PrintClassStatistics, false, \
2630 "prints class statistics at end of run") \
2631 \
2632 notproduct(bool, PrintMethodStatistics, false, \
2633 "prints method statistics at end of run") \
2634 \
2635 /* interpreter */ \
2636 develop(bool, ClearInterpreterLocals, false, \
2637 "Always clear local variables of interpreter activations upon " \
2638 "entry") \
2639 \
2640 product_pd(bool, RewriteBytecodes, \
2641 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2642 \
2643 product_pd(bool, RewriteFrequentPairs, \
2644 "Rewrite frequently used bytecode pairs into a single bytecode") \
2645 \
2646 diagnostic(bool, PrintInterpreter, false, \
2647 "Prints the generated interpreter code") \
2648 \
2649 product(bool, UseInterpreter, true, \
2650 "Use interpreter for non-compiled methods") \
2651 \
2652 develop(bool, UseFastSignatureHandlers, true, \
2653 "Use fast signature handlers for native calls") \
2654 \
2655 product(bool, UseLoopCounter, true, \
2656 "Increment invocation counter on backward branch") \
2657 \
2658 product(bool, UseFastEmptyMethods, true, \
2659 "Use fast method entry code for empty methods") \
2660 \
2661 product(bool, UseFastAccessorMethods, true, \
2662 "Use fast method entry code for accessor methods") \
2663 \
2664 product_pd(bool, UseOnStackReplacement, \
2665 "Use on stack replacement, calls runtime if invoc. counter " \
2666 "overflows in loop") \
2667 \
2668 notproduct(bool, TraceOnStackReplacement, false, \
2669 "Trace on stack replacement") \
2670 \
2671 product_pd(bool, PreferInterpreterNativeStubs, \
2672 "Use always interpreter stubs for native methods invoked via " \
2673 "interpreter") \
2674 \
2675 develop(bool, CountBytecodes, false, \
2676 "Count number of bytecodes executed") \
2677 \
2678 develop(bool, PrintBytecodeHistogram, false, \
2679 "Print histogram of the executed bytecodes") \
2680 \
2681 develop(bool, PrintBytecodePairHistogram, false, \
2682 "Print histogram of the executed bytecode pairs") \
2683 \
2684 diagnostic(bool, PrintSignatureHandlers, false, \
2685 "Print code generated for native method signature handlers") \
2686 \
2687 develop(bool, VerifyOops, false, \
2688 "Do plausibility checks for oops") \
2689 \
2690 develop(bool, CheckUnhandledOops, false, \
2691 "Check for unhandled oops in VM code") \
2692 \
2693 develop(bool, VerifyJNIFields, trueInDebug, \
2694 "Verify jfieldIDs for instance fields") \
2695 \
2696 notproduct(bool, VerifyJNIEnvThread, false, \
2697 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2698 "from JNI") \
2699 \
2700 develop(bool, VerifyFPU, false, \
2701 "Verify FPU state (check for NaN's, etc.)") \
2702 \
2703 develop(bool, VerifyThread, false, \
2704 "Watch the thread register for corruption (SPARC only)") \
2705 \
2706 develop(bool, VerifyActivationFrameSize, false, \
2707 "Verify that activation frame didn't become smaller than its " \
2708 "minimal size") \
2709 \
2710 develop(bool, TraceFrequencyInlining, false, \
2711 "Trace frequency based inlining") \
2712 \
2713 develop_pd(bool, InlineIntrinsics, \
2714 "Inline intrinsics that can be statically resolved") \
2715 \
2716 product_pd(bool, ProfileInterpreter, \
2717 "Profile at the bytecode level during interpretation") \
2718 \
2719 develop_pd(bool, ProfileTraps, \
2720 "Profile deoptimization traps at the bytecode level") \
2721 \
2722 product(intx, ProfileMaturityPercentage, 20, \
2723 "number of method invocations/branches (expressed as % of " \
2724 "CompileThreshold) before using the method's profile") \
2725 \
2726 develop(bool, PrintMethodData, false, \
2727 "Print the results of +ProfileInterpreter at end of run") \
2728 \
2729 develop(bool, VerifyDataPointer, trueInDebug, \
2730 "Verify the method data pointer during interpreter profiling") \
2731 \
2732 develop(bool, VerifyCompiledCode, false, \
2733 "Include miscellaneous runtime verifications in nmethod code; " \
2734 "default off because it disturbs nmethod size heuristics") \
2735 \
2736 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2737 "Manually make GC thread crash then dump java stack trace; " \
2738 "Test only") \
2739 \
2740 /* compilation */ \
2741 product(bool, UseCompiler, true, \
2742 "use compilation") \
2743 \
2744 develop(bool, TraceCompilationPolicy, false, \
2745 "Trace compilation policy") \
2746 \
2747 develop(bool, TimeCompilationPolicy, false, \
2748 "Time the compilation policy") \
2749 \
2750 product(bool, UseCounterDecay, true, \
2751 "adjust recompilation counters") \
2752 \
2753 develop(intx, CounterHalfLifeTime, 30, \
2754 "half-life time of invocation counters (in secs)") \
2755 \
2756 develop(intx, CounterDecayMinIntervalLength, 500, \
2757 "Min. ms. between invocation of CounterDecay") \
2758 \
2759 product(bool, AlwaysCompileLoopMethods, false, \
2760 "when using recompilation, never interpret methods " \
2761 "containing loops") \
2762 \
2763 product(bool, DontCompileHugeMethods, true, \
2764 "don't compile methods > HugeMethodLimit") \
2765 \
2766 /* Bytecode escape analysis estimation. */ \
2767 product(bool, EstimateArgEscape, true, \
2768 "Analyze bytecodes to estimate escape state of arguments") \
2769 \
2770 product(intx, BCEATraceLevel, 0, \
2771 "How much tracing to do of bytecode escape analysis estimates") \
2772 \
2773 product(intx, MaxBCEAEstimateLevel, 5, \
2774 "Maximum number of nested calls that are analyzed by BC EA.") \
2775 \
2776 product(intx, MaxBCEAEstimateSize, 150, \
2777 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2778 \
2779 product(intx, AllocatePrefetchStyle, 1, \
2780 "0 = no prefetch, " \
2781 "1 = prefetch instructions for each allocation, " \
2782 "2 = use TLAB watermark to gate allocation prefetch, " \
2783 "3 = use BIS instruction on Sparc for allocation prefetch") \
2784 \
2785 product(intx, AllocatePrefetchDistance, -1, \
2786 "Distance to prefetch ahead of allocation pointer") \
2787 \
2788 product(intx, AllocatePrefetchLines, 3, \
2789 "Number of lines to prefetch ahead of array allocation pointer") \
2790 \
2791 product(intx, AllocateInstancePrefetchLines, 1, \
2792 "Number of lines to prefetch ahead of instance allocation pointer") \
2793 \
2794 product(intx, AllocatePrefetchStepSize, 16, \
2795 "Step size in bytes of sequential prefetch instructions") \
2796 \
2797 product(intx, AllocatePrefetchInstr, 0, \
2798 "Prefetch instruction to prefetch ahead of allocation pointer") \
2799 \
2800 /* deoptimization */ \
2801 develop(bool, TraceDeoptimization, false, \
2802 "Trace deoptimization") \
2803 \
2804 develop(bool, DebugDeoptimization, false, \
2805 "Tracing various information while debugging deoptimization") \
2806 \
2807 product(intx, SelfDestructTimer, 0, \
2808 "Will cause VM to terminate after a given time (in minutes) " \
2809 "(0 means off)") \
2810 \
2811 product(intx, MaxJavaStackTraceDepth, 1024, \
2812 "Max. no. of lines in the stack trace for Java exceptions " \
2813 "(0 means all)") \
2814 \
2815 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2816 "Guarantee a safepoint (at least) every so many milliseconds " \
2817 "(0 means none)")) \
2818 \
2819 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2820 "Guarantee a safepoint (at least) every so many milliseconds " \
2821 "(0 means none)")) \
2822 \
2823 product(intx, SafepointTimeoutDelay, 10000, \
2824 "Delay in milliseconds for option SafepointTimeout") \
2825 \
2826 product(intx, NmethodSweepFraction, 16, \
2827 "Number of invocations of sweeper to cover all nmethods") \
2828 \
2829 product(intx, NmethodSweepCheckInterval, 5, \
2830 "Compilers wake up every n seconds to possibly sweep nmethods") \
2831 \
2832 notproduct(bool, LogSweeper, false, \
2833 "Keep a ring buffer of sweeper activity") \
2834 \
2835 notproduct(intx, SweeperLogEntries, 1024, \
2836 "Number of records in the ring buffer of sweeper activity") \
2837 \
2838 notproduct(intx, MemProfilingInterval, 500, \
2839 "Time between each invocation of the MemProfiler") \
2840 \
2841 develop(intx, MallocCatchPtr, -1, \
2842 "Hit breakpoint when mallocing/freeing this pointer") \
2843 \
2844 notproduct(intx, AssertRepeat, 1, \
2845 "number of times to evaluate expression in assert " \
2846 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2847 \
2848 notproduct(ccstrlist, SuppressErrorAt, "", \
2849 "List of assertions (file:line) to muzzle") \
2850 \
2851 notproduct(uintx, HandleAllocationLimit, 1024, \
2852 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2853 "is used") \
2854 \
2855 develop(uintx, TotalHandleAllocationLimit, 1024, \
2856 "Threshold for total handle allocation when " \
2857 "+TraceHandleAllocation is used") \
2858 \
2859 develop(intx, StackPrintLimit, 100, \
2860 "number of stack frames to print in VM-level stack dump") \
2861 \
2862 notproduct(intx, MaxElementPrintSize, 256, \
2863 "maximum number of elements to print") \
2864 \
2865 notproduct(intx, MaxSubklassPrintSize, 4, \
2866 "maximum number of subklasses to print when printing klass") \
2867 \
2868 product(intx, MaxInlineLevel, 9, \
2869 "maximum number of nested calls that are inlined") \
2870 \
2871 product(intx, MaxRecursiveInlineLevel, 1, \
2872 "maximum number of nested recursive calls that are inlined") \
2873 \
2874 product_pd(intx, InlineSmallCode, \
2875 "Only inline already compiled methods if their code size is " \
2876 "less than this") \
2877 \
2878 product(intx, MaxInlineSize, 35, \
2879 "maximum bytecode size of a method to be inlined") \
2880 \
2881 product_pd(intx, FreqInlineSize, \
2882 "maximum bytecode size of a frequent method to be inlined") \
2883 \
2884 product(intx, MaxTrivialSize, 6, \
2885 "maximum bytecode size of a trivial method to be inlined") \
2886 \
2887 product(intx, MinInliningThreshold, 250, \
2888 "min. invocation count a method needs to have to be inlined") \
2889 \
2890 develop(intx, MethodHistogramCutoff, 100, \
2891 "cutoff value for method invoc. histogram (+CountCalls)") \
2892 \
2893 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2894 "# of interpreted methods to show in profile") \
2895 \
2896 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2897 "# of compiled methods to show in profile") \
2898 \
2899 develop(intx, ProfilerNumberOfStubMethods, 25, \
2900 "# of stub methods to show in profile") \
2901 \
2902 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2903 "# of runtime stub nodes to show in profile") \
2904 \
2905 product(intx, ProfileIntervalsTicks, 100, \
2906 "# of ticks between printing of interval profile " \
2907 "(+ProfileIntervals)") \
2908 \
2909 notproduct(intx, ScavengeALotInterval, 1, \
2910 "Interval between which scavenge will occur with +ScavengeALot") \
2911 \
2912 notproduct(intx, FullGCALotInterval, 1, \
2913 "Interval between which full gc will occur with +FullGCALot") \
2914 \
2915 notproduct(intx, FullGCALotStart, 0, \
2916 "For which invocation to start FullGCAlot") \
2917 \
2918 notproduct(intx, FullGCALotDummies, 32*K, \
2919 "Dummy object allocated with +FullGCALot, forcing all objects " \
2920 "to move") \
2921 \
2922 develop(intx, DontYieldALotInterval, 10, \
2923 "Interval between which yields will be dropped (milliseconds)") \
2924 \
2925 develop(intx, MinSleepInterval, 1, \
2926 "Minimum sleep() interval (milliseconds) when " \
2927 "ConvertSleepToYield is off (used for SOLARIS)") \
2928 \
2929 develop(intx, ProfilerPCTickThreshold, 15, \
2930 "Number of ticks in a PC buckets to be a hotspot") \
2931 \
2932 notproduct(intx, DeoptimizeALotInterval, 5, \
2933 "Number of exits until DeoptimizeALot kicks in") \
2934 \
2935 notproduct(intx, ZombieALotInterval, 5, \
2936 "Number of exits until ZombieALot kicks in") \
2937 \
2938 develop(bool, StressNonEntrant, false, \
2939 "Mark nmethods non-entrant at registration") \
2940 \
2941 diagnostic(intx, MallocVerifyInterval, 0, \
2942 "if non-zero, verify C heap after every N calls to " \
2943 "malloc/realloc/free") \
2944 \
2945 diagnostic(intx, MallocVerifyStart, 0, \
2946 "if non-zero, start verifying C heap after Nth call to " \
2947 "malloc/realloc/free") \
2948 \
2949 diagnostic(uintx, MallocMaxTestWords, 0, \
2950 "if non-zero, max # of Words that malloc/realloc can allocate " \
2951 "(for testing only)") \
2952 \
2953 product(intx, TypeProfileWidth, 2, \
2954 "number of receiver types to record in call/cast profile") \
2955 \
2956 develop(intx, BciProfileWidth, 2, \
2957 "number of return bci's to record in ret profile") \
2958 \
2959 product(intx, PerMethodRecompilationCutoff, 400, \
2960 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2961 \
2962 product(intx, PerBytecodeRecompilationCutoff, 200, \
2963 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2964 \
2965 product(intx, PerMethodTrapLimit, 100, \
2966 "Limit on traps (of one kind) in a method (includes inlines)") \
2967 \
2968 product(intx, PerBytecodeTrapLimit, 4, \
2969 "Limit on traps (of one kind) at a particular BCI") \
2970 \
2971 develop(intx, InlineFrequencyRatio, 20, \
2972 "Ratio of call site execution to caller method invocation") \
2973 \
2974 develop_pd(intx, InlineFrequencyCount, \
2975 "Count of call site execution necessary to trigger frequent " \
2976 "inlining") \
2977 \
2978 develop(intx, InlineThrowCount, 50, \
2979 "Force inlining of interpreted methods that throw this often") \
2980 \
2981 develop(intx, InlineThrowMaxSize, 200, \
2982 "Force inlining of throwing methods smaller than this") \
2983 \
2984 develop(intx, ProfilerNodeSize, 1024, \
2985 "Size in K to allocate for the Profile Nodes of each thread") \
2986 \
2987 product_pd(intx, PreInflateSpin, \
2988 "Number of times to spin wait before inflation") \
2989 \
2990 /* gc parameters */ \
2991 product(uintx, InitialHeapSize, 0, \
2992 "Initial heap size (in bytes); zero means use ergonomics") \
2993 \
2994 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
2995 "Maximum heap size (in bytes)") \
2996 \
2997 product(uintx, OldSize, ScaleForWordSize(4*M), \
2998 "Initial tenured generation size (in bytes)") \
2999 \
3000 product(uintx, NewSize, ScaleForWordSize(1*M), \
3001 "Initial new generation size (in bytes)") \
3002 \
3003 product(uintx, MaxNewSize, max_uintx, \
3004 "Maximum new generation size (in bytes), max_uintx means set " \
3005 "ergonomically") \
3006 \
3007 product(uintx, PretenureSizeThreshold, 0, \
3008 "Maximum size in bytes of objects allocated in DefNew " \
3009 "generation; zero means no maximum") \
3010 \
3011 product(uintx, TLABSize, 0, \
3012 "Starting TLAB size (in bytes); zero means set ergonomically") \
3013 \
3014 product(uintx, MinTLABSize, 2*K, \
3015 "Minimum allowed TLAB size (in bytes)") \
3016 \
3017 product(uintx, TLABAllocationWeight, 35, \
3018 "Allocation averaging weight") \
3019 \
3020 product(uintx, TLABWasteTargetPercent, 1, \
3021 "Percentage of Eden that can be wasted") \
3022 \
3023 product(uintx, TLABRefillWasteFraction, 64, \
3024 "Max TLAB waste at a refill (internal fragmentation)") \
3025 \
3026 product(uintx, TLABWasteIncrement, 4, \
3027 "Increment allowed waste at slow allocation") \
3028 \
3029 product(uintx, SurvivorRatio, 8, \
3030 "Ratio of eden/survivor space size") \
3031 \
3032 product(uintx, NewRatio, 2, \
3033 "Ratio of new/old generation sizes") \
3034 \
3035 product_pd(uintx, NewSizeThreadIncrease, \
3036 "Additional size added to desired new generation size per " \
3037 "non-daemon thread (in bytes)") \
3038 \
3039 product_pd(uintx, MetaspaceSize, \
3040 "Initial size of Metaspaces (in bytes)") \
3041 \
3042 product(uintx, MaxMetaspaceSize, max_uintx, \
3043 "Maximum size of Metaspaces (in bytes)") \
3044 \
3045 product(uintx, ClassMetaspaceSize, 1*G, \
3046 "Maximum size of InstanceKlass area in Metaspace used for " \
3047 "UseCompressedKlassPointers") \
3048 \
3049 product(uintx, MinHeapFreeRatio, 40, \
3050 "Min percentage of heap free after GC to avoid expansion") \
3051 \
3052 product(uintx, MaxHeapFreeRatio, 70, \
3053 "Max percentage of heap free after GC to avoid shrinking") \
3054 \
3055 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3056 "Number of milliseconds per MB of free space in the heap") \
3057 \
3058 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3059 "Min change in heap space due to GC (in bytes)") \
3060 \
3061 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3062 "Min expansion of Metaspace (in bytes)") \
3063 \
3064 product(uintx, MinMetaspaceFreeRatio, 40, \
3065 "Min percentage of Metaspace free after GC to avoid expansion") \
3066 \
3067 product(uintx, MaxMetaspaceFreeRatio, 70, \
3068 "Max percentage of Metaspace free after GC to avoid shrinking") \
3069 \
3070 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3071 "Max expansion of Metaspace without full GC (in bytes)") \
3072 \
3073 product(uintx, QueuedAllocationWarningCount, 0, \
3074 "Number of times an allocation that queues behind a GC " \
3075 "will retry before printing a warning") \
3076 \
3077 diagnostic(uintx, VerifyGCStartAt, 0, \
3078 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3079 \
3080 diagnostic(intx, VerifyGCLevel, 0, \
3081 "Generation level at which to start +VerifyBefore/AfterGC") \
3082 \
3083 product(uintx, MaxTenuringThreshold, 15, \
3084 "Maximum value for tenuring threshold") \
3085 \
3086 product(uintx, InitialTenuringThreshold, 7, \
3087 "Initial value for tenuring threshold") \
3088 \
3089 product(uintx, TargetSurvivorRatio, 50, \
3090 "Desired percentage of survivor space used after scavenge") \
3091 \
3092 product(uintx, MarkSweepDeadRatio, 5, \
3093 "Percentage (0-100) of the old gen allowed as dead wood." \
3094 "Serial mark sweep treats this as both the min and max value." \
3095 "CMS uses this value only if it falls back to mark sweep." \
3096 "Par compact uses a variable scale based on the density of the" \
3097 "generation and treats this as the max value when the heap is" \
3098 "either completely full or completely empty. Par compact also" \
3099 "has a smaller default value; see arguments.cpp.") \
3100 \
3101 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3102 "How often should we fully compact the heap (ignoring the dead " \
3103 "space parameters)") \
3104 \
3105 product(intx, PrintCMSStatistics, 0, \
3106 "Statistics for CMS") \
3107 \
3108 product(bool, PrintCMSInitiationStatistics, false, \
3109 "Statistics for initiating a CMS collection") \
3110 \
3111 product(intx, PrintFLSStatistics, 0, \
3112 "Statistics for CMS' FreeListSpace") \
3113 \
3114 product(intx, PrintFLSCensus, 0, \
3115 "Census for CMS' FreeListSpace") \
3116 \
3117 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3118 "Delay in ms between expansion and allocation") \
3119 \
3120 develop(uintx, GCWorkerDelayMillis, 0, \
3121 "Delay in ms in scheduling GC workers") \
3122 \
3123 product(intx, DeferThrSuspendLoopCount, 4000, \
3124 "(Unstable) Number of times to iterate in safepoint loop " \
3125 " before blocking VM threads ") \
3126 \
3127 product(intx, DeferPollingPageLoopCount, -1, \
3128 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3129 "before changing safepoint polling page to RO ") \
3130 \
3131 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3132 \
3133 product(bool, PSChunkLargeArrays, true, \
3134 "true: process large arrays in chunks") \
3135 \
3136 product(uintx, GCDrainStackTargetSize, 64, \
3137 "how many entries we'll try to leave on the stack during " \
3138 "parallel GC") \
3139 \
3140 /* stack parameters */ \
3141 product_pd(intx, StackYellowPages, \
3142 "Number of yellow zone (recoverable overflows) pages") \
3143 \
3144 product_pd(intx, StackRedPages, \
3145 "Number of red zone (unrecoverable overflows) pages") \
3146 \
3147 product_pd(intx, StackShadowPages, \
3148 "Number of shadow zone (for overflow checking) pages" \
3149 " this should exceed the depth of the VM and native call stack") \
3150 \
3151 product_pd(intx, ThreadStackSize, \
3152 "Thread Stack Size (in Kbytes)") \
3153 \
3154 product_pd(intx, VMThreadStackSize, \
3155 "Non-Java Thread Stack Size (in Kbytes)") \
3156 \
3157 product_pd(intx, CompilerThreadStackSize, \
3158 "Compiler Thread Stack Size (in Kbytes)") \
3159 \
3160 develop_pd(uintx, JVMInvokeMethodSlack, \
3161 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3162 \
3163 product(uintx, ThreadSafetyMargin, 50*M, \
3164 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3165 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3166 "disable this feature") \
3167 \
3168 /* code cache parameters */ \
3169 develop(uintx, CodeCacheSegmentSize, 64, \
3170 "Code cache segment size (in bytes) - smallest unit of " \
3171 "allocation") \
3172 \
3173 develop_pd(intx, CodeEntryAlignment, \
3174 "Code entry alignment for generated code (in bytes)") \
3175 \
3176 product_pd(intx, OptoLoopAlignment, \
3177 "Align inner loops to zero relative to this modulus") \
3178 \
3179 product_pd(uintx, InitialCodeCacheSize, \
3180 "Initial code cache size (in bytes)") \
3181 \
3182 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3183 "Minimum code cache size (in bytes) required to start VM.") \
3184 \
3185 product_pd(uintx, ReservedCodeCacheSize, \
3186 "Reserved code cache size (in bytes) - maximum code cache size") \
3187 \
3188 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3189 "When less than X space left, we stop compiling.") \
3190 \
3191 product_pd(uintx, CodeCacheExpansionSize, \
3192 "Code cache expansion size (in bytes)") \
3193 \
3194 develop_pd(uintx, CodeCacheMinBlockLength, \
3195 "Minimum number of segments in a code cache block.") \
3196 \
3197 notproduct(bool, ExitOnFullCodeCache, false, \
3198 "Exit the VM if we fill the code cache.") \
3199 \
3200 product(bool, UseCodeCacheFlushing, true, \
3201 "Attempt to clean the code cache before shutting off compiler") \
3202 \
3203 product(intx, MinCodeCacheFlushingInterval, 30, \
3204 "Min number of seconds between code cache cleaning sessions") \
3205 \
3206 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3207 "When less than X space left, start code cache cleaning") \
3208 \
3209 product(uintx, CodeCacheFlushingFraction, 2, \
3210 "Fraction of the code cache that is flushed when full") \
3211 \
3212 /* interpreter debugging */ \
3213 develop(intx, BinarySwitchThreshold, 5, \
3214 "Minimal number of lookupswitch entries for rewriting to binary " \
3215 "switch") \
3216 \
3217 develop(intx, StopInterpreterAt, 0, \
3218 "Stops interpreter execution at specified bytecode number") \
3219 \
3220 develop(intx, TraceBytecodesAt, 0, \
3221 "Traces bytecodes starting with specified bytecode number") \
3222 \
3223 /* compiler interface */ \
3224 develop(intx, CIStart, 0, \
3225 "the id of the first compilation to permit") \
3226 \
3227 develop(intx, CIStop, -1, \
3228 "the id of the last compilation to permit") \
3229 \
3230 develop(intx, CIStartOSR, 0, \
3231 "the id of the first osr compilation to permit " \
3232 "(CICountOSR must be on)") \
3233 \
3234 develop(intx, CIStopOSR, -1, \
3235 "the id of the last osr compilation to permit " \
3236 "(CICountOSR must be on)") \
3237 \
3238 develop(intx, CIBreakAtOSR, -1, \
3239 "id of osr compilation to break at") \
3240 \
3241 develop(intx, CIBreakAt, -1, \
3242 "id of compilation to break at") \
3243 \
3244 product(ccstrlist, CompileOnly, "", \
3245 "List of methods (pkg/class.name) to restrict compilation to") \
3246 \
3247 product(ccstr, CompileCommandFile, NULL, \
3248 "Read compiler commands from this file [.hotspot_compiler]") \
3249 \
3250 product(ccstrlist, CompileCommand, "", \
3251 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3252 \
3253 develop(bool, ReplayCompiles, false, \
3254 "Enable replay of compilations from ReplayDataFile") \
3255 \
3256 product(ccstr, ReplayDataFile, NULL, \
3257 "File containing compilation replay information" \
3258 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3259 \
3260 develop(intx, ReplaySuppressInitializers, 2, \
3261 "Controls handling of class initialization during replay" \
3262 "0 - don't do anything special" \
3263 "1 - treat all class initializers as empty" \
3264 "2 - treat class initializers for application classes as empty" \
3265 "3 - allow all class initializers to run during bootstrap but" \
3266 " pretend they are empty after starting replay") \
3267 \
3268 develop(bool, ReplayIgnoreInitErrors, false, \
3269 "Ignore exceptions thrown during initialization for replay") \
3270 \
3271 product(bool, DumpReplayDataOnError, true, \
3272 "Record replay data for crashing compiler threads") \
3273 \
3274 product(bool, CICompilerCountPerCPU, false, \
3275 "1 compiler thread for log(N CPUs)") \
3276 \
3277 develop(intx, CIFireOOMAt, -1, \
3278 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3279 "(non-negative value throws OOM after this many CI accesses " \
3280 "in each compile)") \
3281 notproduct(intx, CICrashAt, -1, \
3282 "id of compilation to trigger assert in compiler thread for " \
3283 "the purpose of testing, e.g. generation of replay data") \
3284 notproduct(bool, CIObjectFactoryVerify, false, \
3285 "enable potentially expensive verification in ciObjectFactory") \
3286 \
3287 /* Priorities */ \
3288 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3289 \
3290 product(intx, ThreadPriorityPolicy, 0, \
3291 "0 : Normal. "\
3292 " VM chooses priorities that are appropriate for normal "\
3293 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3294 " to normal native priority. Java priorities below NORM_PRIORITY"\
3295 " map to lower native priority values. On Windows applications"\
3296 " are allowed to use higher native priorities. However, with "\
3297 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3298 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3299 " interfere with system threads. On Linux thread priorities "\
3300 " are ignored because the OS does not support static priority "\
3301 " in SCHED_OTHER scheduling class which is the only choice for"\
3302 " non-root, non-realtime applications. "\
3303 "1 : Aggressive. "\
3304 " Java thread priorities map over to the entire range of "\
3305 " native thread priorities. Higher Java thread priorities map "\
3306 " to higher native thread priorities. This policy should be "\
3307 " used with care, as sometimes it can cause performance "\
3308 " degradation in the application and/or the entire system. On "\
3309 " Linux this policy requires root privilege.") \
3310 \
3311 product(bool, ThreadPriorityVerbose, false, \
3312 "Print priority changes") \
3313 \
3314 product(intx, DefaultThreadPriority, -1, \
3315 "The native priority at which threads run if not elsewhere " \
3316 "specified (-1 means no change)") \
3317 \
3318 product(intx, CompilerThreadPriority, -1, \
3319 "The native priority at which compiler threads should run " \
3320 "(-1 means no change)") \
3321 \
3322 product(intx, VMThreadPriority, -1, \
3323 "The native priority at which the VM thread should run " \
3324 "(-1 means no change)") \
3325 \
3326 product(bool, CompilerThreadHintNoPreempt, true, \
3327 "(Solaris only) Give compiler threads an extra quanta") \
3328 \
3329 product(bool, VMThreadHintNoPreempt, false, \
3330 "(Solaris only) Give VM thread an extra quanta") \
3331 \
3332 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3333 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3334 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3335 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3336 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3337 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3338 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3339 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3340 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3341 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3342 \
3343 experimental(bool, UseCriticalJavaThreadPriority, false, \
3344 "Java thread priority 10 maps to critical scheduling priority") \
3345 \
3346 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3347 "Compiler thread(s) run at critical scheduling priority") \
3348 \
3349 experimental(bool, UseCriticalCMSThreadPriority, false, \
3350 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3351 \
3352 /* compiler debugging */ \
3353 notproduct(intx, CompileTheWorldStartAt, 1, \
3354 "First class to consider when using +CompileTheWorld") \
3355 \
3356 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3357 "Last class to consider when using +CompileTheWorld") \
3358 \
3359 develop(intx, NewCodeParameter, 0, \
3360 "Testing Only: Create a dedicated integer parameter before " \
3361 "putback") \
3362 \
3363 /* new oopmap storage allocation */ \
3364 develop(intx, MinOopMapAllocation, 8, \
3365 "Minimum number of OopMap entries in an OopMapSet") \
3366 \
3367 /* Background Compilation */ \
3368 develop(intx, LongCompileThreshold, 50, \
3369 "Used with +TraceLongCompiles") \
3370 \
3371 product(intx, StarvationMonitorInterval, 200, \
3372 "Pause between each check in ms") \
3373 \
3374 /* recompilation */ \
3375 product_pd(intx, CompileThreshold, \
3376 "number of interpreted method invocations before (re-)compiling") \
3377 \
3378 product_pd(intx, BackEdgeThreshold, \
3379 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3380 \
3381 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3382 "Interpreter (tier 0) invocation notification frequency.") \
3383 \
3384 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3385 "C1 without MDO (tier 2) invocation notification frequency.") \
3386 \
3387 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3388 "C1 with MDO profiling (tier 3) invocation notification " \
3389 "frequency.") \
3390 \
3391 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3392 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3393 \
3394 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3395 "Interpreter (tier 0) invocation notification frequency.") \
3396 \
3397 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3398 "C1 without MDO (tier 2) invocation notification frequency.") \
3399 \
3400 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3401 "C1 with MDO profiling (tier 3) invocation notification " \
3402 "frequency.") \
3403 \
3404 product(intx, Tier2CompileThreshold, 0, \
3405 "threshold at which tier 2 compilation is invoked") \
3406 \
3407 product(intx, Tier2BackEdgeThreshold, 0, \
3408 "Back edge threshold at which tier 2 compilation is invoked") \
3409 \
3410 product(intx, Tier3InvocationThreshold, 200, \
3411 "Compile if number of method invocations crosses this " \
3412 "threshold") \
3413 \
3414 product(intx, Tier3MinInvocationThreshold, 100, \
3415 "Minimum invocation to compile at tier 3") \
3416 \
3417 product(intx, Tier3CompileThreshold, 2000, \
3418 "Threshold at which tier 3 compilation is invoked (invocation " \
3419 "minimum must be satisfied.") \
3420 \
3421 product(intx, Tier3BackEdgeThreshold, 60000, \
3422 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3423 \
3424 product(intx, Tier4InvocationThreshold, 5000, \
3425 "Compile if number of method invocations crosses this " \
3426 "threshold") \
3427 \
3428 product(intx, Tier4MinInvocationThreshold, 600, \
3429 "Minimum invocation to compile at tier 4") \
3430 \
3431 product(intx, Tier4CompileThreshold, 15000, \
3432 "Threshold at which tier 4 compilation is invoked (invocation " \
3433 "minimum must be satisfied.") \
3434 \
3435 product(intx, Tier4BackEdgeThreshold, 40000, \
3436 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3437 \
3438 product(intx, Tier3DelayOn, 5, \
3439 "If C2 queue size grows over this amount per compiler thread " \
3440 "stop compiling at tier 3 and start compiling at tier 2") \
3441 \
3442 product(intx, Tier3DelayOff, 2, \
3443 "If C2 queue size is less than this amount per compiler thread " \
3444 "allow methods compiled at tier 2 transition to tier 3") \
3445 \
3446 product(intx, Tier3LoadFeedback, 5, \
3447 "Tier 3 thresholds will increase twofold when C1 queue size " \
3448 "reaches this amount per compiler thread") \
3449 \
3450 product(intx, Tier4LoadFeedback, 3, \
3451 "Tier 4 thresholds will increase twofold when C2 queue size " \
3452 "reaches this amount per compiler thread") \
3453 \
3454 product(intx, TieredCompileTaskTimeout, 50, \
3455 "Kill compile task if method was not used within " \
3456 "given timeout in milliseconds") \
3457 \
3458 product(intx, TieredStopAtLevel, 4, \
3459 "Stop at given compilation level") \
3460 \
3461 product(intx, Tier0ProfilingStartPercentage, 200, \
3462 "Start profiling in interpreter if the counters exceed tier 3" \
3463 "thresholds by the specified percentage") \
3464 \
3465 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3466 "Increase the compile threshold for C1 compilation if the code" \
3467 "cache is filled by the specified percentage.") \
3468 \
3469 product(intx, TieredRateUpdateMinTime, 1, \
3470 "Minimum rate sampling interval (in milliseconds)") \
3471 \
3472 product(intx, TieredRateUpdateMaxTime, 25, \
3473 "Maximum rate sampling interval (in milliseconds)") \
3474 \
3475 product_pd(bool, TieredCompilation, \
3476 "Enable tiered compilation") \
3477 \
3478 product(bool, PrintTieredEvents, false, \
3479 "Print tiered events notifications") \
3480 \
3481 product_pd(intx, OnStackReplacePercentage, \
3482 "NON_TIERED number of method invocations/branches (expressed as %"\
3483 "of CompileThreshold) before (re-)compiling OSR code") \
3484 \
3485 product(intx, InterpreterProfilePercentage, 33, \
3486 "NON_TIERED number of method invocations/branches (expressed as %"\
3487 "of CompileThreshold) before profiling in the interpreter") \
3488 \
3489 develop(intx, MaxRecompilationSearchLength, 10, \
3490 "max. # frames to inspect searching for recompilee") \
3491 \
3492 develop(intx, MaxInterpretedSearchLength, 3, \
3493 "max. # interp. frames to skip when searching for recompilee") \
3494 \
3495 develop(intx, DesiredMethodLimit, 8000, \
3496 "desired max. method size (in bytecodes) after inlining") \
3497 \
3498 develop(intx, HugeMethodLimit, 8000, \
3499 "don't compile methods larger than this if " \
3500 "+DontCompileHugeMethods") \
3501 \
3502 /* New JDK 1.4 reflection implementation */ \
3503 \
3504 develop(bool, UseNewReflection, true, \
3505 "Temporary flag for transition to reflection based on dynamic " \
3506 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3507 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3508 "changes were needed") \
3509 \
3510 develop(bool, VerifyReflectionBytecodes, false, \
3511 "Force verification of 1.4 reflection bytecodes. Does not work " \
3512 "in situations like that described in 4486457 or for " \
3513 "constructors generated for serialization, so can not be enabled "\
3514 "in product.") \
3515 \
3516 product(bool, ReflectionWrapResolutionErrors, true, \
3517 "Temporary flag for transition to AbstractMethodError wrapped " \
3518 "in InvocationTargetException. See 6531596") \
3519 \
3520 develop(bool, VerifyLambdaBytecodes, false, \
3521 "Force verification of jdk 8 lambda metafactory bytecodes.") \
3522 \
3523 develop(intx, FastSuperclassLimit, 8, \
3524 "Depth of hardwired instanceof accelerator array") \
3525 \
3526 /* Properties for Java libraries */ \
3527 \
3528 product(uintx, MaxDirectMemorySize, 0, \
3529 "Maximum total size of NIO direct-buffer allocations") \
3530 \
3531 /* temporary developer defined flags */ \
3532 \
3533 diagnostic(bool, UseNewCode, false, \
3534 "Testing Only: Use the new version while testing") \
3535 \
3536 diagnostic(bool, UseNewCode2, false, \
3537 "Testing Only: Use the new version while testing") \
3538 \
3539 diagnostic(bool, UseNewCode3, false, \
3540 "Testing Only: Use the new version while testing") \
3541 \
3542 /* flags for performance data collection */ \
3543 \
3544 product(bool, UsePerfData, falseInEmbedded, \
3545 "Flag to disable jvmstat instrumentation for performance testing" \
3546 "and problem isolation purposes.") \
3547 \
3548 product(bool, PerfDataSaveToFile, false, \
3549 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3550 \
3551 product(ccstr, PerfDataSaveFile, NULL, \
3552 "Save PerfData memory to the specified absolute pathname," \
3553 "%p in the file name if present will be replaced by pid") \
3554 \
3555 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3556 "Data sampling interval in milliseconds") \
3557 \
3558 develop(bool, PerfTraceDataCreation, false, \
3559 "Trace creation of Performance Data Entries") \
3560 \
3561 develop(bool, PerfTraceMemOps, false, \
3562 "Trace PerfMemory create/attach/detach calls") \
3563 \
3564 product(bool, PerfDisableSharedMem, false, \
3565 "Store performance data in standard memory") \
3566 \
3567 product(intx, PerfDataMemorySize, 32*K, \
3568 "Size of performance data memory region. Will be rounded " \
3569 "up to a multiple of the native os page size.") \
3570 \
3571 product(intx, PerfMaxStringConstLength, 1024, \
3572 "Maximum PerfStringConstant string length before truncation") \
3573 \
3574 product(bool, PerfAllowAtExitRegistration, false, \
3575 "Allow registration of atexit() methods") \
3576 \
3577 product(bool, PerfBypassFileSystemCheck, false, \
3578 "Bypass Win32 file system criteria checks (Windows Only)") \
3579 \
3580 product(intx, UnguardOnExecutionViolation, 0, \
3581 "Unguard page and retry on no-execute fault (Win32 only)" \
3582 "0=off, 1=conservative, 2=aggressive") \
3583 \
3584 /* Serviceability Support */ \
3585 \
3586 product(bool, ManagementServer, false, \
3587 "Create JMX Management Server") \
3588 \
3589 product(bool, DisableAttachMechanism, false, \
3590 "Disable mechanism that allows tools to attach to this VM") \
3591 \
3592 product(bool, StartAttachListener, false, \
3593 "Always start Attach Listener at VM startup") \
3594 \
3595 manageable(bool, PrintConcurrentLocks, false, \
3596 "Print java.util.concurrent locks in thread dump") \
3597 \
3598 product(bool, TransmitErrorReport, false, \
3599 "Enable error report transmission on erroneous termination") \
3600 \
3601 product(ccstr, ErrorReportServer, NULL, \
3602 "Override built-in error report server address") \
3603 \
3604 /* Shared spaces */ \
3605 \
3606 product(bool, UseSharedSpaces, true, \
3607 "Use shared spaces for metadata") \
3608 \
3609 product(bool, RequireSharedSpaces, false, \
3610 "Require shared spaces for metadata") \
3611 \
3612 product(bool, DumpSharedSpaces, false, \
3613 "Special mode: JVM reads a class list, loads classes, builds " \
3614 "shared spaces, and dumps the shared spaces to a file to be " \
3615 "used in future JVM runs.") \
3616 \
3617 product(bool, PrintSharedSpaces, false, \
3618 "Print usage of shared spaces") \
3619 \
3620 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3621 "Size of read-write space for metadata (in bytes)") \
3622 \
3623 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3624 "Size of read-only space for metadata (in bytes)") \
3625 \
3626 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3627 "Size of the shared miscellaneous data area (in bytes)") \
3628 \
3629 product(uintx, SharedMiscCodeSize, 120*K, \
3630 "Size of the shared miscellaneous code area (in bytes)") \
3631 \
3632 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3633 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3634 "Address to allocate shared memory region for class data") \
3635 \
3636 diagnostic(bool, EnableInvokeDynamic, true, \
3637 "support JSR 292 (method handles, invokedynamic, " \
3638 "anonymous classes") \
3639 \
3640 diagnostic(bool, PrintMethodHandleStubs, false, \
3641 "Print generated stub code for method handles") \
3642 \
3643 develop(bool, TraceMethodHandles, false, \
3644 "trace internal method handle operations") \
3645 \
3646 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3647 "perform extra checks when constructing method handles") \
3648 \
3649 diagnostic(bool, ShowHiddenFrames, false, \
3650 "show method handle implementation frames (usually hidden)") \
3651 \
3652 experimental(bool, TrustFinalNonStaticFields, false, \
3653 "trust final non-static declarations for constant folding") \
3654 \
3655 experimental(bool, FoldStableValues, false, \
3656 "Private flag to control optimizations for stable variables") \
3657 \
3658 develop(bool, TraceInvokeDynamic, false, \
3659 "trace internal invoke dynamic operations") \
3660 \
3661 diagnostic(bool, PauseAtStartup, false, \
3662 "Causes the VM to pause at startup time and wait for the pause " \
3663 "file to be removed (default: ./vm.paused.<pid>)") \
3664 \
3665 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3666 "The file to create and for whose removal to await when pausing " \
3667 "at startup. (default: ./vm.paused.<pid>)") \
3668 \
3669 diagnostic(bool, PauseAtExit, false, \
3670 "Pause and wait for keypress on exit if a debugger is attached") \
3671 \
3672 product(bool, ExtendedDTraceProbes, false, \
3673 "Enable performance-impacting dtrace probes") \
3674 \
3675 product(bool, DTraceMethodProbes, false, \
3676 "Enable dtrace probes for method-entry and method-exit") \
3677 \
3678 product(bool, DTraceAllocProbes, false, \
3679 "Enable dtrace probes for object allocation") \
3680 \
3681 product(bool, DTraceMonitorProbes, false, \
3682 "Enable dtrace probes for monitor events") \
3683 \
3684 product(bool, RelaxAccessControlCheck, false, \
3685 "Relax the access control checks in the verifier") \
3686 \
3687 diagnostic(bool, PrintDTraceDOF, false, \
3688 "Print the DTrace DOF passed to the system for JSDT probes") \
3689 \
3690 product(uintx, StringTableSize, defaultStringTableSize, \
3691 "Number of buckets in the interned String table") \
3692 \
3693 develop(bool, TraceDefaultMethods, false, \
3694 "Trace the default method processing steps") \
3695 \
3696 develop(bool, VerifyGenericSignatures, false, \
3697 "Abort VM on erroneous or inconsistent generic signatures") \
3698 \
3699 product(bool, UseVMInterruptibleIO, false, \
3700 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3701 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3702 " of this flag is true for JDK 6 and earlier") \
3703 \
3704 diagnostic(bool, WhiteBoxAPI, false, \
3705 "Enable internal testing APIs") \
3706 \
3707 product(bool, PrintGCCause, true, \
3708 "Include GC cause in GC logging") \
3709 \
3710 product(bool , AllowNonVirtualCalls, false, \
3711 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3712 \
3713 diagnostic(ccstr, SharedArchiveFile, NULL, \
3714 "Override the default location of the CDS archive file") \
3715 \
3716 experimental(uintx, ArrayAllocatorMallocLimit, \
3717 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3718 "Allocation less than this value will be allocated " \
3719 "using malloc. Larger allocations will use mmap.") \
3720 \
3721 product(bool, EnableTracing, false, \
3722 "Enable event-based tracing") \
3723 product(bool, UseLockedTracing, false, \
3724 "Use locked-tracing when doing event-based tracing")
3727 /*
3728 * Macros for factoring of globals
3729 */
3731 // Interface macros
3732 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3733 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3734 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3735 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3736 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3737 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3738 #ifdef PRODUCT
3739 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3740 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3741 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3742 #else
3743 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3744 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3745 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3746 #endif
3747 // Special LP64 flags, product only needed for now.
3748 #ifdef _LP64
3749 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3750 #else
3751 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3752 #endif // _LP64
3754 // Implementation macros
3755 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3756 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3757 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3758 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3759 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3760 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3761 #ifdef PRODUCT
3762 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3763 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3764 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3765 #else
3766 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3767 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3768 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3769 #endif
3770 #ifdef _LP64
3771 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3772 #else
3773 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3774 #endif // _LP64
3776 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)
3778 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3780 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3782 // Extensions
3784 #include "runtime/globals_ext.hpp"
3786 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
