1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #if !defined(COMPILER1) && !defined(COMPILER2)
26 define_pd_global(bool, BackgroundCompilation, false);
27 define_pd_global(bool, UseTLAB, false);
28 define_pd_global(bool, CICompileOSR, false);
29 define_pd_global(bool, UseTypeProfile, false);
30 define_pd_global(bool, UseOnStackReplacement, false);
31 define_pd_global(bool, InlineIntrinsics, false);
32 define_pd_global(bool, PreferInterpreterNativeStubs, true);
33 define_pd_global(bool, ProfileInterpreter, false);
34 define_pd_global(bool, ProfileTraps, false);
35 define_pd_global(bool, TieredCompilation, false);
36
37 define_pd_global(intx, CompileThreshold, 0);
38 define_pd_global(intx, Tier2CompileThreshold, 0);
39 define_pd_global(intx, Tier3CompileThreshold, 0);
40 define_pd_global(intx, Tier4CompileThreshold, 0);
41
42 define_pd_global(intx, BackEdgeThreshold, 0);
43 define_pd_global(intx, Tier2BackEdgeThreshold, 0);
44 define_pd_global(intx, Tier3BackEdgeThreshold, 0);
45 define_pd_global(intx, Tier4BackEdgeThreshold, 0);
46
47 define_pd_global(intx, OnStackReplacePercentage, 0);
48 define_pd_global(bool, ResizeTLAB, false);
49 define_pd_global(intx, FreqInlineSize, 0);
50 define_pd_global(intx, InlineSmallCode, 0);
51 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
52 define_pd_global(intx, InlineClassNatives, true);
53 define_pd_global(intx, InlineUnsafeOps, true);
54 define_pd_global(intx, InitialCodeCacheSize, 160*K);
55 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
56 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
57 define_pd_global(intx, CodeCacheMinBlockLength, 1);
58 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
59 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
60 define_pd_global(bool, NeverActAsServerClassMachine, true);
61 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
62 #define CI_COMPILER_COUNT 0
63 #else
64
65 #ifdef COMPILER2
66 #define CI_COMPILER_COUNT 2
67 #else
68 #define CI_COMPILER_COUNT 1
69 #endif // COMPILER2
70
71 #endif // no compilers
72
73
74 // string type aliases used only in this file
75 typedef const char* ccstr;
76 typedef const char* ccstrlist; // represents string arguments which accumulate
77
78 enum FlagValueOrigin {
79 DEFAULT = 0,
80 COMMAND_LINE = 1,
81 ENVIRON_VAR = 2,
82 CONFIG_FILE = 3,
83 MANAGEMENT = 4,
84 ERGONOMIC = 5,
85 ATTACH_ON_DEMAND = 6,
86 INTERNAL = 99
87 };
88
89 struct Flag {
90 const char *type;
91 const char *name;
92 void* addr;
93 const char *kind;
94 FlagValueOrigin origin;
95
96 // points to all Flags static array
97 static Flag *flags;
98
99 // number of flags
100 static size_t numFlags;
101
102 static Flag* find_flag(char* name, size_t length);
103
104 bool is_bool() const { return strcmp(type, "bool") == 0; }
105 bool get_bool() const { return *((bool*) addr); }
106 void set_bool(bool value) { *((bool*) addr) = value; }
107
108 bool is_intx() const { return strcmp(type, "intx") == 0; }
109 intx get_intx() const { return *((intx*) addr); }
110 void set_intx(intx value) { *((intx*) addr) = value; }
111
112 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
113 uintx get_uintx() const { return *((uintx*) addr); }
114 void set_uintx(uintx value) { *((uintx*) addr) = value; }
115
116 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
117 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
118 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
119
120 bool is_double() const { return strcmp(type, "double") == 0; }
121 double get_double() const { return *((double*) addr); }
122 void set_double(double value) { *((double*) addr) = value; }
123
124 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
125 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
126 ccstr get_ccstr() const { return *((ccstr*) addr); }
127 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
128
129 bool is_unlocker() const;
130 bool is_unlocked() const;
131 bool is_writeable() const;
132 bool is_external() const;
133
134 void print_on(outputStream* st);
135 void print_as_flag(outputStream* st);
136 };
137
138 // debug flags control various aspects of the VM and are global accessible
139
140 // use FlagSetting to temporarily change some debug flag
141 // e.g. FlagSetting fs(DebugThisAndThat, true);
142 // restored to previous value upon leaving scope
143 class FlagSetting {
144 bool val;
145 bool* flag;
146 public:
147 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
148 ~FlagSetting() { *flag = val; }
149 };
150
151
152 class CounterSetting {
153 intx* counter;
154 public:
155 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
156 ~CounterSetting() { (*counter)--; }
157 };
158
159
160 class IntFlagSetting {
161 intx val;
162 intx* flag;
163 public:
164 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
165 ~IntFlagSetting() { *flag = val; }
166 };
167
168
169 class DoubleFlagSetting {
170 double val;
171 double* flag;
172 public:
173 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
174 ~DoubleFlagSetting() { *flag = val; }
175 };
176
177
178 class CommandLineFlags {
179 public:
180 static bool boolAt(char* name, size_t len, bool* value);
181 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
182 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
183 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
184
185 static bool intxAt(char* name, size_t len, intx* value);
186 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
187 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
188 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
189
190 static bool uintxAt(char* name, size_t len, uintx* value);
191 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
192 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
193 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
194
195 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
196 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
197 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
198 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
199
200 static bool doubleAt(char* name, size_t len, double* value);
201 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
202 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
203 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
204
205 static bool ccstrAt(char* name, size_t len, ccstr* value);
206 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
207 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
208 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
209
210 // Returns false if name is not a command line flag.
211 static bool wasSetOnCmdline(const char* name, bool* value);
212 static void printSetFlags();
213
214 static void printFlags();
215
216 static void verify() PRODUCT_RETURN;
217 };
218
219 // use this for flags that are true by default in the debug version but
220 // false in the optimized version, and vice versa
221 #ifdef ASSERT
222 #define trueInDebug true
223 #define falseInDebug false
224 #else
225 #define trueInDebug false
226 #define falseInDebug true
227 #endif
228
229 // use this for flags that are true per default in the product build
230 // but false in development builds, and vice versa
231 #ifdef PRODUCT
232 #define trueInProduct true
233 #define falseInProduct false
234 #else
235 #define trueInProduct false
236 #define falseInProduct true
237 #endif
238
239 // use this for flags that are true per default in the tiered build
240 // but false in non-tiered builds, and vice versa
241 #ifdef TIERED
242 #define trueInTiered true
243 #define falseInTiered false
244 #else
245 #define trueInTiered false
246 #define falseInTiered true
247 #endif
248
249 // develop flags are settable / visible only during development and are constant in the PRODUCT version
250 // product flags are always settable / visible
251 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
252
253 // A flag must be declared with one of the following types:
254 // bool, intx, uintx, ccstr.
255 // The type "ccstr" is an alias for "const char*" and is used
256 // only in this file, because the macrology requires single-token type names.
257
258 // Note: Diagnostic options not meant for VM tuning or for product modes.
259 // They are to be used for VM quality assurance or field diagnosis
260 // of VM bugs. They are hidden so that users will not be encouraged to
261 // try them as if they were VM ordinary execution options. However, they
262 // are available in the product version of the VM. Under instruction
263 // from support engineers, VM customers can turn them on to collect
264 // diagnostic information about VM problems. To use a VM diagnostic
265 // option, you must first specify +UnlockDiagnosticVMOptions.
266 // (This master switch also affects the behavior of -Xprintflags.)
267 //
268 // experimental flags are in support of features that are not
269 // part of the officially supported product, but are available
270 // for experimenting with. They could, for example, be performance
271 // features that may not have undergone full or rigorous QA, but which may
272 // help performance in some cases and released for experimentation
273 // by the community of users and developers. This flag also allows one to
274 // be able to build a fully supported product that nonetheless also
275 // ships with some unsupported, lightly tested, experimental features.
276 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
277 // UnlockExperimentalVMOptions flag, which allows the control and
278 // modification of the experimental flags.
279 //
280 // manageable flags are writeable external product flags.
281 // They are dynamically writeable through the JDK management interface
282 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
283 // These flags are external exported interface (see CCC). The list of
284 // manageable flags can be queried programmatically through the management
285 // interface.
286 //
287 // A flag can be made as "manageable" only if
288 // - the flag is defined in a CCC as an external exported interface.
289 // - the VM implementation supports dynamic setting of the flag.
290 // This implies that the VM must *always* query the flag variable
291 // and not reuse state related to the flag state at any given time.
292 // - you want the flag to be queried programmatically by the customers.
293 //
294 // product_rw flags are writeable internal product flags.
295 // They are like "manageable" flags but for internal/private use.
296 // The list of product_rw flags are internal/private flags which
297 // may be changed/removed in a future release. It can be set
298 // through the management interface to get/set value
299 // when the name of flag is supplied.
300 //
301 // A flag can be made as "product_rw" only if
302 // - the VM implementation supports dynamic setting of the flag.
303 // This implies that the VM must *always* query the flag variable
304 // and not reuse state related to the flag state at any given time.
305 //
306 // Note that when there is a need to support develop flags to be writeable,
307 // it can be done in the same way as product_rw.
308
309 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
310 \
311 lp64_product(bool, UseCompressedOops, false, \
312 "Use 32-bit object references in 64-bit VM. " \
313 "lp64_product means flag is always constant in 32 bit VM") \
314 \
315 notproduct(bool, CheckCompressedOops, true, \
316 "generate checks in encoding/decoding code in debug VM") \
317 \
318 product_pd(uintx, HeapBaseMinAddress, \
319 "OS specific low limit for heap base address") \
320 \
321 diagnostic(bool, PrintCompressedOopsMode, false, \
322 "Print compressed oops base address and encoding mode") \
323 \
324 /* UseMembar is theoretically a temp flag used for memory barrier \
325 * removal testing. It was supposed to be removed before FCS but has \
326 * been re-added (see 6401008) */ \
327 product(bool, UseMembar, false, \
328 "(Unstable) Issues membars on thread state transitions") \
329 \
330 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
331 "Enable normal processing of flags relating to field diagnostics")\
332 \
333 experimental(bool, UnlockExperimentalVMOptions, false, \
334 "Enable normal processing of flags relating to experimental features")\
335 \
336 product(bool, JavaMonitorsInStackTrace, true, \
337 "Print info. about Java monitor locks when the stacks are dumped")\
338 \
339 product_pd(bool, UseLargePages, \
340 "Use large page memory") \
341 \
342 product_pd(bool, UseLargePagesIndividualAllocation, \
343 "Allocate large pages individually for better affinity") \
344 \
345 develop(bool, LargePagesIndividualAllocationInjectError, false, \
346 "Fail large pages individual allocation") \
347 \
348 develop(bool, TracePageSizes, false, \
349 "Trace page size selection and usage.") \
350 \
351 product(bool, UseNUMA, false, \
352 "Use NUMA if available") \
353 \
354 product(bool, ForceNUMA, false, \
355 "Force NUMA optimizations on single-node/UMA systems") \
356 \
357 product(intx, NUMAChunkResizeWeight, 20, \
358 "Percentage (0-100) used to weight the current sample when " \
359 "computing exponentially decaying average for " \
360 "AdaptiveNUMAChunkSizing") \
361 \
362 product(intx, NUMASpaceResizeRate, 1*G, \
363 "Do not reallocate more that this amount per collection") \
364 \
365 product(bool, UseAdaptiveNUMAChunkSizing, true, \
366 "Enable adaptive chunk sizing for NUMA") \
367 \
368 product(bool, NUMAStats, false, \
369 "Print NUMA stats in detailed heap information") \
370 \
371 product(intx, NUMAPageScanRate, 256, \
372 "Maximum number of pages to include in the page scan procedure") \
373 \
374 product_pd(bool, NeedsDeoptSuspend, \
375 "True for register window machines (sparc/ia64)") \
376 \
377 product(intx, UseSSE, 99, \
378 "Highest supported SSE instructions set on x86/x64") \
379 \
380 product(uintx, LargePageSizeInBytes, 0, \
381 "Large page size (0 to let VM choose the page size") \
382 \
383 product(uintx, LargePageHeapSizeThreshold, 128*M, \
384 "Use large pages if max heap is at least this big") \
385 \
386 product(bool, ForceTimeHighResolution, false, \
387 "Using high time resolution(For Win32 only)") \
388 \
389 develop(bool, TraceItables, false, \
390 "Trace initialization and use of itables") \
391 \
392 develop(bool, TracePcPatching, false, \
393 "Trace usage of frame::patch_pc") \
394 \
395 develop(bool, TraceJumps, false, \
396 "Trace assembly jumps in thread ring buffer") \
397 \
398 develop(bool, TraceRelocator, false, \
399 "Trace the bytecode relocator") \
400 \
401 develop(bool, TraceLongCompiles, false, \
402 "Print out every time compilation is longer than " \
403 "a given threashold") \
404 \
405 develop(bool, SafepointALot, false, \
406 "Generates a lot of safepoints. Works with " \
407 "GuaranteedSafepointInterval") \
408 \
409 product_pd(bool, BackgroundCompilation, \
410 "A thread requesting compilation is not blocked during " \
411 "compilation") \
412 \
413 product(bool, PrintVMQWaitTime, false, \
414 "Prints out the waiting time in VM operation queue") \
415 \
416 develop(bool, BailoutToInterpreterForThrows, false, \
417 "Compiled methods which throws/catches exceptions will be " \
418 "deopt and intp.") \
419 \
420 develop(bool, NoYieldsInMicrolock, false, \
421 "Disable yields in microlock") \
422 \
423 develop(bool, TraceOopMapGeneration, false, \
424 "Shows oopmap generation") \
425 \
426 product(bool, MethodFlushing, true, \
427 "Reclamation of zombie and not-entrant methods") \
428 \
429 develop(bool, VerifyStack, false, \
430 "Verify stack of each thread when it is entering a runtime call") \
431 \
432 develop(bool, ForceUnreachable, false, \
433 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
434 \
435 notproduct(bool, StressDerivedPointers, false, \
436 "Force scavenge when a derived pointers is detected on stack " \
437 "after rtm call") \
438 \
439 develop(bool, TraceDerivedPointers, false, \
440 "Trace traversal of derived pointers on stack") \
441 \
442 notproduct(bool, TraceCodeBlobStacks, false, \
443 "Trace stack-walk of codeblobs") \
444 \
445 product(bool, PrintJNIResolving, false, \
446 "Used to implement -v:jni") \
447 \
448 notproduct(bool, PrintRewrites, false, \
449 "Print methods that are being rewritten") \
450 \
451 product(bool, UseInlineCaches, true, \
452 "Use Inline Caches for virtual calls ") \
453 \
454 develop(bool, InlineArrayCopy, true, \
455 "inline arraycopy native that is known to be part of " \
456 "base library DLL") \
457 \
458 develop(bool, InlineObjectHash, true, \
459 "inline Object::hashCode() native that is known to be part " \
460 "of base library DLL") \
461 \
462 develop(bool, InlineObjectCopy, true, \
463 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
464 \
465 develop(bool, InlineNatives, true, \
466 "inline natives that are known to be part of base library DLL") \
467 \
468 develop(bool, InlineMathNatives, true, \
469 "inline SinD, CosD, etc.") \
470 \
471 develop(bool, InlineClassNatives, true, \
472 "inline Class.isInstance, etc") \
473 \
474 develop(bool, InlineAtomicLong, true, \
475 "inline sun.misc.AtomicLong") \
476 \
477 develop(bool, InlineThreadNatives, true, \
478 "inline Thread.currentThread, etc") \
479 \
480 develop(bool, InlineReflectionGetCallerClass, true, \
481 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
482 "of base library DLL") \
483 \
484 develop(bool, InlineUnsafeOps, true, \
485 "inline memory ops (native methods) from sun.misc.Unsafe") \
486 \
487 develop(bool, ConvertCmpD2CmpF, true, \
488 "Convert cmpD to cmpF when one input is constant in float range") \
489 \
490 develop(bool, ConvertFloat2IntClipping, true, \
491 "Convert float2int clipping idiom to integer clipping") \
492 \
493 develop(bool, SpecialStringCompareTo, true, \
494 "special version of string compareTo") \
495 \
496 develop(bool, SpecialStringIndexOf, true, \
497 "special version of string indexOf") \
498 \
499 develop(bool, SpecialStringEquals, true, \
500 "special version of string equals") \
501 \
502 develop(bool, SpecialArraysEquals, true, \
503 "special version of Arrays.equals(char[],char[])") \
504 \
505 product(bool, UseSSE42Intrinsics, false, \
506 "SSE4.2 versions of intrinsics") \
507 \
508 develop(bool, TraceCallFixup, false, \
509 "traces all call fixups") \
510 \
511 develop(bool, DeoptimizeALot, false, \
512 "deoptimize at every exit from the runtime system") \
513 \
514 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
515 "a comma separated list of bcis to deoptimize at") \
516 \
517 product(bool, DeoptimizeRandom, false, \
518 "deoptimize random frames on random exit from the runtime system")\
519 \
520 notproduct(bool, ZombieALot, false, \
521 "creates zombies (non-entrant) at exit from the runt. system") \
522 \
523 notproduct(bool, WalkStackALot, false, \
524 "trace stack (no print) at every exit from the runtime system") \
525 \
526 develop(bool, Debugging, false, \
527 "set when executing debug methods in debug.ccp " \
528 "(to prevent triggering assertions)") \
529 \
530 notproduct(bool, StrictSafepointChecks, trueInDebug, \
531 "Enable strict checks that safepoints cannot happen for threads " \
532 "that used No_Safepoint_Verifier") \
533 \
534 notproduct(bool, VerifyLastFrame, false, \
535 "Verify oops on last frame on entry to VM") \
536 \
537 develop(bool, TraceHandleAllocation, false, \
538 "Prints out warnings when suspicious many handles are allocated") \
539 \
540 product(bool, UseCompilerSafepoints, true, \
541 "Stop at safepoints in compiled code") \
542 \
543 product(bool, UseSplitVerifier, true, \
544 "use split verifier with StackMapTable attributes") \
545 \
546 product(bool, FailOverToOldVerifier, true, \
547 "fail over to old verifier when split verifier fails") \
548 \
549 develop(bool, ShowSafepointMsgs, false, \
550 "Show msg. about safepoint synch.") \
551 \
552 product(bool, SafepointTimeout, false, \
553 "Time out and warn or fail after SafepointTimeoutDelay " \
554 "milliseconds if failed to reach safepoint") \
555 \
556 develop(bool, DieOnSafepointTimeout, false, \
557 "Die upon failure to reach safepoint (see SafepointTimeout)") \
558 \
559 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
560 /* typically, at most a few retries are needed */ \
561 product(intx, SuspendRetryCount, 50, \
562 "Maximum retry count for an external suspend request") \
563 \
564 product(intx, SuspendRetryDelay, 5, \
565 "Milliseconds to delay per retry (* current_retry_count)") \
566 \
567 product(bool, AssertOnSuspendWaitFailure, false, \
568 "Assert/Guarantee on external suspend wait failure") \
569 \
570 product(bool, TraceSuspendWaitFailures, false, \
571 "Trace external suspend wait failures") \
572 \
573 product(bool, MaxFDLimit, true, \
574 "Bump the number of file descriptors to max in solaris.") \
575 \
576 notproduct(bool, LogEvents, trueInDebug, \
577 "Enable Event log") \
578 \
579 product(bool, BytecodeVerificationRemote, true, \
580 "Enables the Java bytecode verifier for remote classes") \
581 \
582 product(bool, BytecodeVerificationLocal, false, \
583 "Enables the Java bytecode verifier for local classes") \
584 \
585 develop(bool, ForceFloatExceptions, trueInDebug, \
586 "Force exceptions on FP stack under/overflow") \
587 \
588 develop(bool, SoftMatchFailure, trueInProduct, \
589 "If the DFA fails to match a node, print a message and bail out") \
590 \
591 develop(bool, VerifyStackAtCalls, false, \
592 "Verify that the stack pointer is unchanged after calls") \
593 \
594 develop(bool, TraceJavaAssertions, false, \
595 "Trace java language assertions") \
596 \
597 notproduct(bool, CheckAssertionStatusDirectives, false, \
598 "temporary - see javaClasses.cpp") \
599 \
600 notproduct(bool, PrintMallocFree, false, \
601 "Trace calls to C heap malloc/free allocation") \
602 \
603 notproduct(bool, PrintOopAddress, false, \
604 "Always print the location of the oop") \
605 \
606 notproduct(bool, VerifyCodeCacheOften, false, \
607 "Verify compiled-code cache often") \
608 \
609 develop(bool, ZapDeadCompiledLocals, false, \
610 "Zap dead locals in compiler frames") \
611 \
612 notproduct(bool, ZapDeadLocalsOld, false, \
613 "Zap dead locals (old version, zaps all frames when " \
614 "entering the VM") \
615 \
616 notproduct(bool, CheckOopishValues, false, \
617 "Warn if value contains oop ( requires ZapDeadLocals)") \
618 \
619 develop(bool, UseMallocOnly, false, \
620 "use only malloc/free for allocation (no resource area/arena)") \
621 \
622 develop(bool, PrintMalloc, false, \
623 "print all malloc/free calls") \
624 \
625 develop(bool, ZapResourceArea, trueInDebug, \
626 "Zap freed resource/arena space with 0xABABABAB") \
627 \
628 notproduct(bool, ZapVMHandleArea, trueInDebug, \
629 "Zap freed VM handle space with 0xBCBCBCBC") \
630 \
631 develop(bool, ZapJNIHandleArea, trueInDebug, \
632 "Zap freed JNI handle space with 0xFEFEFEFE") \
633 \
634 develop(bool, ZapUnusedHeapArea, trueInDebug, \
635 "Zap unused heap space with 0xBAADBABE") \
636 \
637 develop(bool, TraceZapUnusedHeapArea, false, \
638 "Trace zapping of unused heap space") \
639 \
640 develop(bool, CheckZapUnusedHeapArea, false, \
641 "Check zapping of unused heap space") \
642 \
643 develop(bool, ZapFillerObjects, trueInDebug, \
644 "Zap filler objects with 0xDEAFBABE") \
645 \
646 develop(bool, PrintVMMessages, true, \
647 "Print vm messages on console") \
648 \
649 product(bool, PrintGCApplicationConcurrentTime, false, \
650 "Print the time the application has been running") \
651 \
652 product(bool, PrintGCApplicationStoppedTime, false, \
653 "Print the time the application has been stopped") \
654 \
655 develop(bool, Verbose, false, \
656 "Prints additional debugging information from other modes") \
657 \
658 develop(bool, PrintMiscellaneous, false, \
659 "Prints uncategorized debugging information (requires +Verbose)") \
660 \
661 develop(bool, WizardMode, false, \
662 "Prints much more debugging information") \
663 \
664 product(bool, ShowMessageBoxOnError, false, \
665 "Keep process alive on VM fatal error") \
666 \
667 product_pd(bool, UseOSErrorReporting, \
668 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
669 \
670 product(bool, SuppressFatalErrorMessage, false, \
671 "Do NO Fatal Error report [Avoid deadlock]") \
672 \
673 product(ccstrlist, OnError, "", \
674 "Run user-defined commands on fatal error; see VMError.cpp " \
675 "for examples") \
676 \
677 product(ccstrlist, OnOutOfMemoryError, "", \
678 "Run user-defined commands on first java.lang.OutOfMemoryError") \
679 \
680 manageable(bool, HeapDumpBeforeFullGC, false, \
681 "Dump heap to file before any major stop-world GC") \
682 \
683 manageable(bool, HeapDumpAfterFullGC, false, \
684 "Dump heap to file after any major stop-world GC") \
685 \
686 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
687 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
688 \
689 manageable(ccstr, HeapDumpPath, NULL, \
690 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
691 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
692 "in the working directory)") \
693 \
694 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
695 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
696 "when the heap usage is larger than this") \
697 \
698 develop(uintx, HeapDumpSegmentSize, 1*G, \
699 "Approximate segment size when generating a segmented heap dump") \
700 \
701 develop(bool, BreakAtWarning, false, \
702 "Execute breakpoint upon encountering VM warning") \
703 \
704 product_pd(bool, UseVectoredExceptions, \
705 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
706 \
707 develop(bool, TraceVMOperation, false, \
708 "Trace vm operations") \
709 \
710 develop(bool, UseFakeTimers, false, \
711 "Tells whether the VM should use system time or a fake timer") \
712 \
713 diagnostic(bool, LogCompilation, false, \
714 "Log compilation activity in detail to hotspot.log or LogFile") \
715 \
716 product(bool, PrintCompilation, false, \
717 "Print compilations") \
718 \
719 diagnostic(bool, TraceNMethodInstalls, false, \
720 "Trace nmethod intallation") \
721 \
722 diagnostic(intx, ScavengeRootsInCode, 0, \
723 "0: do not allow scavengable oops in the code cache; " \
724 "1: allow scavenging from the code cache; " \
725 "2: emit as many constants as the compiler can see") \
726 \
727 diagnostic(bool, TraceOSRBreakpoint, false, \
728 "Trace OSR Breakpoint ") \
729 \
730 diagnostic(bool, TraceCompileTriggered, false, \
731 "Trace compile triggered") \
732 \
733 diagnostic(bool, TraceTriggers, false, \
734 "Trace triggers") \
735 \
736 product(bool, AlwaysRestoreFPU, false, \
737 "Restore the FPU control word after every JNI call (expensive)") \
738 \
739 notproduct(bool, PrintCompilation2, false, \
740 "Print additional statistics per compilation") \
741 \
742 diagnostic(bool, PrintAdapterHandlers, false, \
743 "Print code generated for i2c/c2i adapters") \
744 \
745 develop(bool, VerifyAdapterSharing, false, \
746 "Verify that the code for shared adapters is the equivalent") \
747 \
748 diagnostic(bool, PrintAssembly, false, \
749 "Print assembly code (using external disassembler.so)") \
750 \
751 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
752 "Options string passed to disassembler.so") \
753 \
754 diagnostic(bool, PrintNMethods, false, \
755 "Print assembly code for nmethods when generated") \
756 \
757 diagnostic(bool, PrintNativeNMethods, false, \
758 "Print assembly code for native nmethods when generated") \
759 \
760 develop(bool, PrintDebugInfo, false, \
761 "Print debug information for all nmethods when generated") \
762 \
763 develop(bool, PrintRelocations, false, \
764 "Print relocation information for all nmethods when generated") \
765 \
766 develop(bool, PrintDependencies, false, \
767 "Print dependency information for all nmethods when generated") \
768 \
769 develop(bool, PrintExceptionHandlers, false, \
770 "Print exception handler tables for all nmethods when generated") \
771 \
772 develop(bool, InterceptOSException, false, \
773 "Starts debugger when an implicit OS (e.g., NULL) " \
774 "exception happens") \
775 \
776 notproduct(bool, PrintCodeCache, false, \
777 "Print the compiled_code cache when exiting") \
778 \
779 develop(bool, PrintCodeCache2, false, \
780 "Print detailed info on the compiled_code cache when exiting") \
781 \
782 diagnostic(bool, PrintStubCode, false, \
783 "Print generated stub code") \
784 \
785 product(bool, StackTraceInThrowable, true, \
786 "Collect backtrace in throwable when exception happens") \
787 \
788 product(bool, OmitStackTraceInFastThrow, true, \
789 "Omit backtraces for some 'hot' exceptions in optimized code") \
790 \
791 product(bool, ProfilerPrintByteCodeStatistics, false, \
792 "Prints byte code statictics when dumping profiler output") \
793 \
794 product(bool, ProfilerRecordPC, false, \
795 "Collects tick for each 16 byte interval of compiled code") \
796 \
797 product(bool, ProfileVM, false, \
798 "Profiles ticks that fall within VM (either in the VM Thread " \
799 "or VM code called through stubs)") \
800 \
801 product(bool, ProfileIntervals, false, \
802 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
803 \
804 notproduct(bool, ProfilerCheckIntervals, false, \
805 "Collect and print info on spacing of profiler ticks") \
806 \
807 develop(bool, PrintJVMWarnings, false, \
808 "Prints warnings for unimplemented JVM functions") \
809 \
810 notproduct(uintx, WarnOnStalledSpinLock, 0, \
811 "Prints warnings for stalled SpinLocks") \
812 \
813 develop(bool, InitializeJavaLangSystem, true, \
814 "Initialize java.lang.System - turn off for individual " \
815 "method debugging") \
816 \
817 develop(bool, InitializeJavaLangString, true, \
818 "Initialize java.lang.String - turn off for individual " \
819 "method debugging") \
820 \
821 develop(bool, InitializeJavaLangExceptionsErrors, true, \
822 "Initialize various error and exception classes - turn off for " \
823 "individual method debugging") \
824 \
825 product(bool, RegisterFinalizersAtInit, true, \
826 "Register finalizable objects at end of Object.<init> or " \
827 "after allocation") \
828 \
829 develop(bool, RegisterReferences, true, \
830 "Tells whether the VM should register soft/weak/final/phantom " \
831 "references") \
832 \
833 develop(bool, IgnoreRewrites, false, \
834 "Supress rewrites of bytecodes in the oopmap generator. " \
835 "This is unsafe!") \
836 \
837 develop(bool, PrintCodeCacheExtension, false, \
838 "Print extension of code cache") \
839 \
840 develop(bool, UsePrivilegedStack, true, \
841 "Enable the security JVM functions") \
842 \
843 develop(bool, IEEEPrecision, true, \
844 "Enables IEEE precision (for INTEL only)") \
845 \
846 develop(bool, ProtectionDomainVerification, true, \
847 "Verifies protection domain before resolution in system " \
848 "dictionary") \
849 \
850 product(bool, ClassUnloading, true, \
851 "Do unloading of classes") \
852 \
853 diagnostic(bool, LinkWellKnownClasses, false, \
854 "Resolve a well known class as soon as its name is seen") \
855 \
856 develop(bool, DisableStartThread, false, \
857 "Disable starting of additional Java threads " \
858 "(for debugging only)") \
859 \
860 develop(bool, MemProfiling, false, \
861 "Write memory usage profiling to log file") \
862 \
863 notproduct(bool, PrintSystemDictionaryAtExit, false, \
864 "Prints the system dictionary at exit") \
865 \
866 diagnostic(bool, UnsyncloadClass, false, \
867 "Unstable: VM calls loadClass unsynchronized. Custom " \
868 "class loader must call VM synchronized for findClass " \
869 "and defineClass.") \
870 \
871 product(bool, AlwaysLockClassLoader, false, \
872 "Require the VM to acquire the class loader lock before calling " \
873 "loadClass() even for class loaders registering " \
874 "as parallel capable") \
875 \
876 product(bool, AllowParallelDefineClass, false, \
877 "Allow parallel defineClass requests for class loaders " \
878 "registering as parallel capable") \
879 \
880 product(bool, MustCallLoadClassInternal, false, \
881 "Call loadClassInternal() rather than loadClass()") \
882 \
883 product_pd(bool, DontYieldALot, \
884 "Throw away obvious excess yield calls (for SOLARIS only)") \
885 \
886 product_pd(bool, ConvertSleepToYield, \
887 "Converts sleep(0) to thread yield " \
888 "(may be off for SOLARIS to improve GUI)") \
889 \
890 product(bool, ConvertYieldToSleep, false, \
891 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
892 "behavior (SOLARIS only)") \
893 \
894 product(bool, UseBoundThreads, true, \
895 "Bind user level threads to kernel threads (for SOLARIS only)") \
896 \
897 develop(bool, UseDetachedThreads, true, \
898 "Use detached threads that are recycled upon termination " \
899 "(for SOLARIS only)") \
900 \
901 product(bool, UseLWPSynchronization, true, \
902 "Use LWP-based instead of libthread-based synchronization " \
903 "(SPARC only)") \
904 \
905 product(ccstr, SyncKnobs, NULL, \
906 "(Unstable) Various monitor synchronization tunables") \
907 \
908 product(intx, EmitSync, 0, \
909 "(Unsafe,Unstable) " \
910 " Controls emission of inline sync fast-path code") \
911 \
912 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
913 \
914 product(intx, Atomics, 0, \
915 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
916 \
917 product(intx, FenceInstruction, 0, \
918 "(Unsafe,Unstable) Experimental") \
919 \
920 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
921 \
922 product(intx, SyncVerbose, 0, "(Unstable)" ) \
923 \
924 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
925 \
926 product(intx, hashCode, 0, \
927 "(Unstable) select hashCode generation algorithm" ) \
928 \
929 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
930 "(Unstable, Linux-specific)" \
931 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
932 \
933 product(bool, FilterSpuriousWakeups, true, \
934 "Prevent spurious or premature wakeups from object.wait " \
935 "(Solaris only)") \
936 \
937 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
938 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
939 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
940 \
941 develop(bool, UsePthreads, false, \
942 "Use pthread-based instead of libthread-based synchronization " \
943 "(SPARC only)") \
944 \
945 product(bool, AdjustConcurrency, false, \
946 "call thr_setconcurrency at thread create time to avoid " \
947 "LWP starvation on MP systems (For Solaris Only)") \
948 \
949 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
950 "Should the system attempt to update the compiler file when " \
951 "an error occurs?") \
952 \
953 product(bool, ReduceSignalUsage, false, \
954 "Reduce the use of OS signals in Java and/or the VM") \
955 \
956 notproduct(bool, ValidateMarkSweep, false, \
957 "Do extra validation during MarkSweep collection") \
958 \
959 notproduct(bool, RecordMarkSweepCompaction, false, \
960 "Enable GC-to-GC recording and querying of compaction during " \
961 "MarkSweep") \
962 \
963 develop_pd(bool, ShareVtableStubs, \
964 "Share vtable stubs (smaller code but worse branch prediction") \
965 \
966 develop(bool, LoadLineNumberTables, true, \
967 "Tells whether the class file parser loads line number tables") \
968 \
969 develop(bool, LoadLocalVariableTables, true, \
970 "Tells whether the class file parser loads local variable tables")\
971 \
972 develop(bool, LoadLocalVariableTypeTables, true, \
973 "Tells whether the class file parser loads local variable type tables")\
974 \
975 product(bool, AllowUserSignalHandlers, false, \
976 "Do not complain if the application installs signal handlers " \
977 "(Solaris & Linux only)") \
978 \
979 product(bool, UseSignalChaining, true, \
980 "Use signal-chaining to invoke signal handlers installed " \
981 "by the application (Solaris & Linux only)") \
982 \
983 product(bool, UseAltSigs, false, \
984 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
985 "internal signals (Solaris only)") \
986 \
987 product(bool, UseSpinning, false, \
988 "Use spinning in monitor inflation and before entry") \
989 \
990 product(bool, PreSpinYield, false, \
991 "Yield before inner spinning loop") \
992 \
993 product(bool, PostSpinYield, true, \
994 "Yield after inner spinning loop") \
995 \
996 product(bool, AllowJNIEnvProxy, false, \
997 "Allow JNIEnv proxies for jdbx") \
998 \
999 product(bool, JNIDetachReleasesMonitors, true, \
1000 "JNI DetachCurrentThread releases monitors owned by thread") \
1001 \
1002 product(bool, RestoreMXCSROnJNICalls, false, \
1003 "Restore MXCSR when returning from JNI calls") \
1004 \
1005 product(bool, CheckJNICalls, false, \
1006 "Verify all arguments to JNI calls") \
1007 \
1008 product(bool, UseFastJNIAccessors, true, \
1009 "Use optimized versions of Get<Primitive>Field") \
1010 \
1011 product(bool, EagerXrunInit, false, \
1012 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1013 " but not all -Xrun libraries may support the state of the VM at this time") \
1014 \
1015 product(bool, PreserveAllAnnotations, false, \
1016 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1017 \
1018 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1019 "Number of OutOfMemoryErrors preallocated with backtrace") \
1020 \
1021 product(bool, LazyBootClassLoader, true, \
1022 "Enable/disable lazy opening of boot class path entries") \
1023 \
1024 diagnostic(bool, UseIncDec, true, \
1025 "Use INC, DEC instructions on x86") \
1026 \
1027 product(bool, UseNewLongLShift, false, \
1028 "Use optimized bitwise shift left") \
1029 \
1030 product(bool, UseStoreImmI16, true, \
1031 "Use store immediate 16-bits value instruction on x86") \
1032 \
1033 product(bool, UseAddressNop, false, \
1034 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1035 \
1036 product(bool, UseXmmLoadAndClearUpper, true, \
1037 "Load low part of XMM register and clear upper part") \
1038 \
1039 product(bool, UseXmmRegToRegMoveAll, false, \
1040 "Copy all XMM register bits when moving value between registers") \
1041 \
1042 product(bool, UseXmmI2D, false, \
1043 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1044 \
1045 product(bool, UseXmmI2F, false, \
1046 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1047 \
1048 product(bool, UseXMMForArrayCopy, false, \
1049 "Use SSE2 MOVQ instruction for Arraycopy") \
1050 \
1051 product(bool, UseUnalignedLoadStores, false, \
1052 "Use SSE2 MOVDQU instruction for Arraycopy") \
1053 \
1054 product(intx, FieldsAllocationStyle, 1, \
1055 "0 - type based with oops first, 1 - with oops last, " \
1056 "2 - oops in super and sub classes are together") \
1057 \
1058 product(bool, CompactFields, true, \
1059 "Allocate nonstatic fields in gaps between previous fields") \
1060 \
1061 notproduct(bool, PrintCompactFieldsSavings, false, \
1062 "Print how many words were saved with CompactFields") \
1063 \
1064 product(bool, UseBiasedLocking, true, \
1065 "Enable biased locking in JVM") \
1066 \
1067 product(intx, BiasedLockingStartupDelay, 4000, \
1068 "Number of milliseconds to wait before enabling biased locking") \
1069 \
1070 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1071 "Print statistics of biased locking in JVM") \
1072 \
1073 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1074 "Threshold of number of revocations per type to try to " \
1075 "rebias all objects in the heap of that type") \
1076 \
1077 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1078 "Threshold of number of revocations per type to permanently " \
1079 "revoke biases of all objects in the heap of that type") \
1080 \
1081 product(intx, BiasedLockingDecayTime, 25000, \
1082 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1083 "type after previous bulk rebias") \
1084 \
1085 /* tracing */ \
1086 \
1087 notproduct(bool, TraceRuntimeCalls, false, \
1088 "Trace run-time calls") \
1089 \
1090 develop(bool, TraceJNICalls, false, \
1091 "Trace JNI calls") \
1092 \
1093 notproduct(bool, TraceJVMCalls, false, \
1094 "Trace JVM calls") \
1095 \
1096 product(ccstr, TraceJVMTI, NULL, \
1097 "Trace flags for JVMTI functions and events") \
1098 \
1099 product(bool, ForceFullGCJVMTIEpilogues, false, \
1100 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \
1101 \
1102 /* This option can change an EMCP method into an obsolete method. */ \
1103 /* This can affect tests that except specific methods to be EMCP. */ \
1104 /* This option should be used with caution. */ \
1105 product(bool, StressLdcRewrite, false, \
1106 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1107 \
1108 product(intx, TraceRedefineClasses, 0, \
1109 "Trace level for JVMTI RedefineClasses") \
1110 \
1111 /* change to false by default sometime after Mustang */ \
1112 product(bool, VerifyMergedCPBytecodes, true, \
1113 "Verify bytecodes after RedefineClasses constant pool merging") \
1114 \
1115 develop(bool, TraceJNIHandleAllocation, false, \
1116 "Trace allocation/deallocation of JNI handle blocks") \
1117 \
1118 develop(bool, TraceThreadEvents, false, \
1119 "Trace all thread events") \
1120 \
1121 develop(bool, TraceBytecodes, false, \
1122 "Trace bytecode execution") \
1123 \
1124 develop(bool, TraceClassInitialization, false, \
1125 "Trace class initialization") \
1126 \
1127 develop(bool, TraceExceptions, false, \
1128 "Trace exceptions") \
1129 \
1130 develop(bool, TraceICs, false, \
1131 "Trace inline cache changes") \
1132 \
1133 notproduct(bool, TraceInvocationCounterOverflow, false, \
1134 "Trace method invocation counter overflow") \
1135 \
1136 develop(bool, TraceInlineCacheClearing, false, \
1137 "Trace clearing of inline caches in nmethods") \
1138 \
1139 develop(bool, TraceDependencies, false, \
1140 "Trace dependencies") \
1141 \
1142 develop(bool, VerifyDependencies, trueInDebug, \
1143 "Exercise and verify the compilation dependency mechanism") \
1144 \
1145 develop(bool, TraceNewOopMapGeneration, false, \
1146 "Trace OopMapGeneration") \
1147 \
1148 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1149 "Trace OopMapGeneration: print detailed cell states") \
1150 \
1151 develop(bool, TimeOopMap, false, \
1152 "Time calls to GenerateOopMap::compute_map() in sum") \
1153 \
1154 develop(bool, TimeOopMap2, false, \
1155 "Time calls to GenerateOopMap::compute_map() individually") \
1156 \
1157 develop(bool, TraceMonitorMismatch, false, \
1158 "Trace monitor matching failures during OopMapGeneration") \
1159 \
1160 develop(bool, TraceOopMapRewrites, false, \
1161 "Trace rewritting of method oops during oop map generation") \
1162 \
1163 develop(bool, TraceSafepoint, false, \
1164 "Trace safepoint operations") \
1165 \
1166 develop(bool, TraceICBuffer, false, \
1167 "Trace usage of IC buffer") \
1168 \
1169 develop(bool, TraceCompiledIC, false, \
1170 "Trace changes of compiled IC") \
1171 \
1172 notproduct(bool, TraceZapDeadLocals, false, \
1173 "Trace zapping dead locals") \
1174 \
1175 develop(bool, TraceStartupTime, false, \
1176 "Trace setup time") \
1177 \
1178 develop(bool, TraceHPI, false, \
1179 "Trace Host Porting Interface (HPI)") \
1180 \
1181 product(ccstr, HPILibPath, NULL, \
1182 "Specify alternate path to HPI library") \
1183 \
1184 develop(bool, TraceProtectionDomainVerification, false, \
1185 "Trace protection domain verifcation") \
1186 \
1187 develop(bool, TraceClearedExceptions, false, \
1188 "Prints when an exception is forcibly cleared") \
1189 \
1190 product(bool, TraceClassResolution, false, \
1191 "Trace all constant pool resolutions (for debugging)") \
1192 \
1193 product(bool, TraceBiasedLocking, false, \
1194 "Trace biased locking in JVM") \
1195 \
1196 product(bool, TraceMonitorInflation, false, \
1197 "Trace monitor inflation in JVM") \
1198 \
1199 /* assembler */ \
1200 product(bool, Use486InstrsOnly, false, \
1201 "Use 80486 Compliant instruction subset") \
1202 \
1203 /* gc */ \
1204 \
1205 product(bool, UseSerialGC, false, \
1206 "Use the serial garbage collector") \
1207 \
1208 product(bool, UseG1GC, false, \
1209 "Use the Garbage-First garbage collector") \
1210 \
1211 product(bool, UseParallelGC, false, \
1212 "Use the Parallel Scavenge garbage collector") \
1213 \
1214 product(bool, UseParallelOldGC, false, \
1215 "Use the Parallel Old garbage collector") \
1216 \
1217 product(bool, UseParallelOldGCCompacting, true, \
1218 "In the Parallel Old garbage collector use parallel compaction") \
1219 \
1220 product(bool, UseParallelDensePrefixUpdate, true, \
1221 "In the Parallel Old garbage collector use parallel dense" \
1222 " prefix update") \
1223 \
1224 product(uintx, HeapMaximumCompactionInterval, 20, \
1225 "How often should we maximally compact the heap (not allowing " \
1226 "any dead space)") \
1227 \
1228 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1229 "The collection count for the first maximum compaction") \
1230 \
1231 product(bool, UseMaximumCompactionOnSystemGC, true, \
1232 "In the Parallel Old garbage collector maximum compaction for " \
1233 "a system GC") \
1234 \
1235 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1236 "The mean used by the par compact dead wood" \
1237 "limiter (a number between 0-100).") \
1238 \
1239 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1240 "The standard deviation used by the par compact dead wood" \
1241 "limiter (a number between 0-100).") \
1242 \
1243 product(bool, UseParallelOldGCDensePrefix, true, \
1244 "Use a dense prefix with the Parallel Old garbage collector") \
1245 \
1246 product(uintx, ParallelGCThreads, 0, \
1247 "Number of parallel threads parallel gc will use") \
1248 \
1249 develop(bool, ParallelOldGCSplitALot, false, \
1250 "Provoke splitting (copying data from a young gen space to" \
1251 "multiple destination spaces)") \
1252 \
1253 develop(uintx, ParallelOldGCSplitInterval, 3, \
1254 "How often to provoke splitting a young gen space") \
1255 \
1256 develop(bool, TraceRegionTasksQueuing, false, \
1257 "Trace the queuing of the region tasks") \
1258 \
1259 product(uintx, ConcGCThreads, 0, \
1260 "Number of threads concurrent gc will use") \
1261 \
1262 product(uintx, YoungPLABSize, 4096, \
1263 "Size of young gen promotion labs (in HeapWords)") \
1264 \
1265 product(uintx, OldPLABSize, 1024, \
1266 "Size of old gen promotion labs (in HeapWords)") \
1267 \
1268 product(uintx, GCTaskTimeStampEntries, 200, \
1269 "Number of time stamp entries per gc worker thread") \
1270 \
1271 product(bool, AlwaysTenure, false, \
1272 "Always tenure objects in eden. (ParallelGC only)") \
1273 \
1274 product(bool, NeverTenure, false, \
1275 "Never tenure objects in eden, May tenure on overflow " \
1276 "(ParallelGC only)") \
1277 \
1278 product(bool, ScavengeBeforeFullGC, true, \
1279 "Scavenge youngest generation before each full GC, " \
1280 "used with UseParallelGC") \
1281 \
1282 develop(bool, ScavengeWithObjectsInToSpace, false, \
1283 "Allow scavenges to occur when to_space contains objects.") \
1284 \
1285 product(bool, UseConcMarkSweepGC, false, \
1286 "Use Concurrent Mark-Sweep GC in the old generation") \
1287 \
1288 product(bool, ExplicitGCInvokesConcurrent, false, \
1289 "A System.gc() request invokes a concurrent collection;" \
1290 " (effective only when UseConcMarkSweepGC)") \
1291 \
1292 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1293 "A System.gc() request invokes a concurrent collection and " \
1294 "also unloads classes during such a concurrent gc cycle " \
1295 "(effective only when UseConcMarkSweepGC)") \
1296 \
1297 develop(bool, UseCMSAdaptiveFreeLists, true, \
1298 "Use Adaptive Free Lists in the CMS generation") \
1299 \
1300 develop(bool, UseAsyncConcMarkSweepGC, true, \
1301 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1302 \
1303 develop(bool, RotateCMSCollectionTypes, false, \
1304 "Rotate the CMS collections among concurrent and STW") \
1305 \
1306 product(bool, UseCMSBestFit, true, \
1307 "Use CMS best fit allocation strategy") \
1308 \
1309 product(bool, UseCMSCollectionPassing, true, \
1310 "Use passing of collection from background to foreground") \
1311 \
1312 product(bool, UseParNewGC, false, \
1313 "Use parallel threads in the new generation.") \
1314 \
1315 product(bool, ParallelGCVerbose, false, \
1316 "Verbose output for parallel GC.") \
1317 \
1318 product(intx, ParallelGCBufferWastePct, 10, \
1319 "wasted fraction of parallel allocation buffer.") \
1320 \
1321 product(bool, ParallelGCRetainPLAB, true, \
1322 "Retain parallel allocation buffers across scavenges.") \
1323 \
1324 product(intx, TargetPLABWastePct, 10, \
1325 "target wasted space in last buffer as pct of overall allocation")\
1326 \
1327 product(uintx, PLABWeight, 75, \
1328 "Percentage (0-100) used to weight the current sample when" \
1329 "computing exponentially decaying average for ResizePLAB.") \
1330 \
1331 product(bool, ResizePLAB, true, \
1332 "Dynamically resize (survivor space) promotion labs") \
1333 \
1334 product(bool, PrintPLAB, false, \
1335 "Print (survivor space) promotion labs sizing decisions") \
1336 \
1337 product(intx, ParGCArrayScanChunk, 50, \
1338 "Scan a subset and push remainder, if array is bigger than this") \
1339 \
1340 product(bool, ParGCUseLocalOverflow, false, \
1341 "Instead of a global overflow list, use local overflow stacks") \
1342 \
1343 product(bool, ParGCTrimOverflow, true, \
1344 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1345 \
1346 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1347 "Whether we should simulate work queue overflow in ParNew") \
1348 \
1349 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1350 "An `interval' counter that determines how frequently " \
1351 "we simulate overflow; a smaller number increases frequency") \
1352 \
1353 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1354 "The desired number of objects to claim from the overflow list") \
1355 \
1356 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1357 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1358 "parallel GC.") \
1359 \
1360 product(uintx, OldPLABWeight, 50, \
1361 "Percentage (0-100) used to weight the current sample when" \
1362 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1363 \
1364 product(bool, ResizeOldPLAB, true, \
1365 "Dynamically resize (old gen) promotion labs") \
1366 \
1367 product(bool, PrintOldPLAB, false, \
1368 "Print (old gen) promotion labs sizing decisions") \
1369 \
1370 product(uintx, CMSOldPLABMin, 16, \
1371 "Min size of CMS gen promotion lab caches per worker per blksize")\
1372 \
1373 product(uintx, CMSOldPLABMax, 1024, \
1374 "Max size of CMS gen promotion lab caches per worker per blksize")\
1375 \
1376 product(uintx, CMSOldPLABNumRefills, 4, \
1377 "Nominal number of refills of CMS gen promotion lab cache" \
1378 " per worker per block size") \
1379 \
1380 product(bool, CMSOldPLABResizeQuicker, false, \
1381 "Whether to react on-the-fly during a scavenge to a sudden" \
1382 " change in block demand rate") \
1383 \
1384 product(uintx, CMSOldPLABToleranceFactor, 4, \
1385 "The tolerance of the phase-change detector for on-the-fly" \
1386 " PLAB resizing during a scavenge") \
1387 \
1388 product(uintx, CMSOldPLABReactivityFactor, 2, \
1389 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1390 " during a scavenge") \
1391 \
1392 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1393 "The clamping of the gain in the feedback loop for on-the-fly" \
1394 " PLAB resizing during a scavenge") \
1395 \
1396 product(bool, AlwaysPreTouch, false, \
1397 "It forces all freshly committed pages to be pre-touched.") \
1398 \
1399 product(bool, CMSUseOldDefaults, false, \
1400 "A flag temporarily introduced to allow reverting to some " \
1401 "older default settings; older as of 6.0") \
1402 \
1403 product(intx, CMSYoungGenPerWorker, 16*M, \
1404 "The amount of young gen chosen by default per GC worker " \
1405 "thread available") \
1406 \
1407 product(bool, GCOverheadReporting, false, \
1408 "Enables the GC overhead reporting facility") \
1409 \
1410 product(intx, GCOverheadReportingPeriodMS, 100, \
1411 "Reporting period for conc GC overhead reporting, in ms ") \
1412 \
1413 product(bool, CMSIncrementalMode, false, \
1414 "Whether CMS GC should operate in \"incremental\" mode") \
1415 \
1416 product(uintx, CMSIncrementalDutyCycle, 10, \
1417 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1418 "CMSIncrementalPacing is enabled, then this is just the initial" \
1419 "value") \
1420 \
1421 product(bool, CMSIncrementalPacing, true, \
1422 "Whether the CMS incremental mode duty cycle should be " \
1423 "automatically adjusted") \
1424 \
1425 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1426 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1427 "enabled (a percentage, 0-100)") \
1428 \
1429 product(uintx, CMSIncrementalSafetyFactor, 10, \
1430 "Percentage (0-100) used to add conservatism when computing the " \
1431 "duty cycle") \
1432 \
1433 product(uintx, CMSIncrementalOffset, 0, \
1434 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1435 " is shifted to the right within the period between young GCs") \
1436 \
1437 product(uintx, CMSExpAvgFactor, 50, \
1438 "Percentage (0-100) used to weight the current sample when" \
1439 "computing exponential averages for CMS statistics.") \
1440 \
1441 product(uintx, CMS_FLSWeight, 75, \
1442 "Percentage (0-100) used to weight the current sample when" \
1443 "computing exponentially decating averages for CMS FLS statistics.") \
1444 \
1445 product(uintx, CMS_FLSPadding, 1, \
1446 "The multiple of deviation from mean to use for buffering" \
1447 "against volatility in free list demand.") \
1448 \
1449 product(uintx, FLSCoalescePolicy, 2, \
1450 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1451 \
1452 product(bool, FLSAlwaysCoalesceLarge, false, \
1453 "CMS: Larger free blocks are always available for coalescing") \
1454 \
1455 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1456 "CMS: the smaller the percentage the greater the coalition force")\
1457 \
1458 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1459 "CMS: the factor by which to inflate estimated demand of small" \
1460 " block sizes to prevent coalescing with an adjoining block") \
1461 \
1462 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1463 "CMS: the factor by which to inflate estimated demand of large" \
1464 " block sizes to prevent coalescing with an adjoining block") \
1465 \
1466 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1467 "CMS: the factor by which to inflate estimated demand of small" \
1468 " block sizes to prevent splitting to supply demand for smaller" \
1469 " blocks") \
1470 \
1471 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1472 "CMS: the factor by which to inflate estimated demand of large" \
1473 " block sizes to prevent splitting to supply demand for smaller" \
1474 " blocks") \
1475 \
1476 product(bool, CMSExtrapolateSweep, false, \
1477 "CMS: cushion for block demand during sweep") \
1478 \
1479 product(uintx, CMS_SweepWeight, 75, \
1480 "Percentage (0-100) used to weight the current sample when " \
1481 "computing exponentially decaying average for inter-sweep " \
1482 "duration") \
1483 \
1484 product(uintx, CMS_SweepPadding, 1, \
1485 "The multiple of deviation from mean to use for buffering " \
1486 "against volatility in inter-sweep duration.") \
1487 \
1488 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1489 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1490 "duration exceeds this threhold in milliseconds") \
1491 \
1492 develop(bool, CMSTraceIncrementalMode, false, \
1493 "Trace CMS incremental mode") \
1494 \
1495 develop(bool, CMSTraceIncrementalPacing, false, \
1496 "Trace CMS incremental mode pacing computation") \
1497 \
1498 develop(bool, CMSTraceThreadState, false, \
1499 "Trace the CMS thread state (enable the trace_state() method)") \
1500 \
1501 product(bool, CMSClassUnloadingEnabled, false, \
1502 "Whether class unloading enabled when using CMS GC") \
1503 \
1504 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1505 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1506 " for which classes may not be unloaded") \
1507 \
1508 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1509 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1510 \
1511 product(bool, UseCMSCompactAtFullCollection, true, \
1512 "Use mark sweep compact at full collections") \
1513 \
1514 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1515 "Number of CMS full collection done before compaction if > 0") \
1516 \
1517 develop(intx, CMSDictionaryChoice, 0, \
1518 "Use BinaryTreeDictionary as default in the CMS generation") \
1519 \
1520 product(uintx, CMSIndexedFreeListReplenish, 4, \
1521 "Replenish and indexed free list with this number of chunks") \
1522 \
1523 product(bool, CMSReplenishIntermediate, true, \
1524 "Replenish all intermediate free-list caches") \
1525 \
1526 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1527 "When satisfying batched demand, splot blocks from the " \
1528 "IndexedFreeList whose size is a multiple of requested size") \
1529 \
1530 product(bool, CMSLoopWarn, false, \
1531 "Warn in case of excessive CMS looping") \
1532 \
1533 develop(bool, CMSOverflowEarlyRestoration, false, \
1534 "Whether preserved marks should be restored early") \
1535 \
1536 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1537 "Size of marking stack") \
1538 \
1539 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1540 "Max size of marking stack") \
1541 \
1542 notproduct(bool, CMSMarkStackOverflowALot, false, \
1543 "Whether we should simulate frequent marking stack / work queue" \
1544 " overflow") \
1545 \
1546 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1547 "An `interval' counter that determines how frequently" \
1548 " we simulate overflow; a smaller number increases frequency") \
1549 \
1550 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1551 "(Temporary, subject to experimentation)" \
1552 "Maximum number of abortable preclean iterations, if > 0") \
1553 \
1554 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1555 "(Temporary, subject to experimentation)" \
1556 "Maximum time in abortable preclean in ms") \
1557 \
1558 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1559 "(Temporary, subject to experimentation)" \
1560 "Nominal minimum work per abortable preclean iteration") \
1561 \
1562 product(intx, CMSAbortablePrecleanWaitMillis, 100, \
1563 "(Temporary, subject to experimentation)" \
1564 " Time that we sleep between iterations when not given" \
1565 " enough work per iteration") \
1566 \
1567 product(uintx, CMSRescanMultiple, 32, \
1568 "Size (in cards) of CMS parallel rescan task") \
1569 \
1570 product(uintx, CMSConcMarkMultiple, 32, \
1571 "Size (in cards) of CMS concurrent MT marking task") \
1572 \
1573 product(uintx, CMSRevisitStackSize, 1*M, \
1574 "Size of CMS KlassKlass revisit stack") \
1575 \
1576 product(bool, CMSAbortSemantics, false, \
1577 "Whether abort-on-overflow semantics is implemented") \
1578 \
1579 product(bool, CMSParallelRemarkEnabled, true, \
1580 "Whether parallel remark enabled (only if ParNewGC)") \
1581 \
1582 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1583 "Whether parallel remark of survivor space" \
1584 " enabled (effective only if CMSParallelRemarkEnabled)") \
1585 \
1586 product(bool, CMSPLABRecordAlways, true, \
1587 "Whether to always record survivor space PLAB bdries" \
1588 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1589 \
1590 product(bool, CMSConcurrentMTEnabled, true, \
1591 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1592 \
1593 product(bool, CMSPermGenPrecleaningEnabled, true, \
1594 "Whether concurrent precleaning enabled in perm gen" \
1595 " (effective only when CMSPrecleaningEnabled is true)") \
1596 \
1597 product(bool, CMSPrecleaningEnabled, true, \
1598 "Whether concurrent precleaning enabled") \
1599 \
1600 product(uintx, CMSPrecleanIter, 3, \
1601 "Maximum number of precleaning iteration passes") \
1602 \
1603 product(uintx, CMSPrecleanNumerator, 2, \
1604 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1605 " ratio") \
1606 \
1607 product(uintx, CMSPrecleanDenominator, 3, \
1608 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1609 " ratio") \
1610 \
1611 product(bool, CMSPrecleanRefLists1, true, \
1612 "Preclean ref lists during (initial) preclean phase") \
1613 \
1614 product(bool, CMSPrecleanRefLists2, false, \
1615 "Preclean ref lists during abortable preclean phase") \
1616 \
1617 product(bool, CMSPrecleanSurvivors1, false, \
1618 "Preclean survivors during (initial) preclean phase") \
1619 \
1620 product(bool, CMSPrecleanSurvivors2, true, \
1621 "Preclean survivors during abortable preclean phase") \
1622 \
1623 product(uintx, CMSPrecleanThreshold, 1000, \
1624 "Don't re-iterate if #dirty cards less than this") \
1625 \
1626 product(bool, CMSCleanOnEnter, true, \
1627 "Clean-on-enter optimization for reducing number of dirty cards") \
1628 \
1629 product(uintx, CMSRemarkVerifyVariant, 1, \
1630 "Choose variant (1,2) of verification following remark") \
1631 \
1632 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1633 "If Eden used is below this value, don't try to schedule remark") \
1634 \
1635 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1636 "The Eden occupancy % at which to try and schedule remark pause") \
1637 \
1638 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1639 "Start sampling Eden top at least before yg occupancy reaches" \
1640 " 1/<ratio> of the size at which we plan to schedule remark") \
1641 \
1642 product(uintx, CMSSamplingGrain, 16*K, \
1643 "The minimum distance between eden samples for CMS (see above)") \
1644 \
1645 product(bool, CMSScavengeBeforeRemark, false, \
1646 "Attempt scavenge before the CMS remark step") \
1647 \
1648 develop(bool, CMSTraceSweeper, false, \
1649 "Trace some actions of the CMS sweeper") \
1650 \
1651 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1652 "Don't drain below this size per parallel worker/thief") \
1653 \
1654 product(intx, CMSWaitDuration, 2000, \
1655 "Time in milliseconds that CMS thread waits for young GC") \
1656 \
1657 product(bool, CMSYield, true, \
1658 "Yield between steps of concurrent mark & sweep") \
1659 \
1660 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1661 "Bitmap operations should process at most this many bits" \
1662 "between yields") \
1663 \
1664 product(bool, CMSDumpAtPromotionFailure, false, \
1665 "Dump useful information about the state of the CMS old " \
1666 " generation upon a promotion failure.") \
1667 \
1668 product(bool, CMSPrintChunksInDump, false, \
1669 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1670 " more detailed information about the free chunks.") \
1671 \
1672 product(bool, CMSPrintObjectsInDump, false, \
1673 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1674 " more detailed information about the allocated objects.") \
1675 \
1676 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1677 "Verify that all refs across the FLS boundary " \
1678 " are to valid objects") \
1679 \
1680 diagnostic(bool, FLSVerifyLists, false, \
1681 "Do lots of (expensive) FreeListSpace verification") \
1682 \
1683 diagnostic(bool, FLSVerifyIndexTable, false, \
1684 "Do lots of (expensive) FLS index table verification") \
1685 \
1686 develop(bool, FLSVerifyDictionary, false, \
1687 "Do lots of (expensive) FLS dictionary verification") \
1688 \
1689 develop(bool, VerifyBlockOffsetArray, false, \
1690 "Do (expensive!) block offset array verification") \
1691 \
1692 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \
1693 "Maintain _unallocated_block in BlockOffsetArray" \
1694 " (currently applicable only to CMS collector)") \
1695 \
1696 develop(bool, TraceCMSState, false, \
1697 "Trace the state of the CMS collection") \
1698 \
1699 product(intx, RefDiscoveryPolicy, 0, \
1700 "Whether reference-based(0) or referent-based(1)") \
1701 \
1702 product(bool, ParallelRefProcEnabled, false, \
1703 "Enable parallel reference processing whenever possible") \
1704 \
1705 product(bool, ParallelRefProcBalancingEnabled, true, \
1706 "Enable balancing of reference processing queues") \
1707 \
1708 product(intx, CMSTriggerRatio, 80, \
1709 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1710 "allocated before a CMS collection cycle commences") \
1711 \
1712 product(intx, CMSTriggerPermRatio, 80, \
1713 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1714 "is allocated before a CMS collection cycle commences, that " \
1715 "also collects the perm generation") \
1716 \
1717 product(uintx, CMSBootstrapOccupancy, 50, \
1718 "Percentage CMS generation occupancy at which to " \
1719 "initiate CMS collection for bootstrapping collection stats") \
1720 \
1721 product(intx, CMSInitiatingOccupancyFraction, -1, \
1722 "Percentage CMS generation occupancy to start a CMS collection " \
1723 "cycle. A negative value means that CMSTriggerRatio is used") \
1724 \
1725 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1726 "Percentage of the (entire) heap occupancy to start a " \
1727 "concurrent GC cycle. It us used by GCs that trigger a " \
1728 "concurrent GC cycle based on the occupancy of the entire heap, " \
1729 "not just one of the generations (e.g., G1). A value of 0 " \
1730 "denotes 'do constant GC cycles'.") \
1731 \
1732 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1733 "Percentage CMS perm generation occupancy to start a " \
1734 "CMScollection cycle. A negative value means that " \
1735 "CMSTriggerPermRatio is used") \
1736 \
1737 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1738 "Only use occupancy as a crierion for starting a CMS collection") \
1739 \
1740 product(intx, CMSIsTooFullPercentage, 98, \
1741 "An absolute ceiling above which CMS will always consider the " \
1742 "perm gen ripe for collection") \
1743 \
1744 develop(bool, CMSTestInFreeList, false, \
1745 "Check if the coalesced range is already in the " \
1746 "free lists as claimed") \
1747 \
1748 notproduct(bool, CMSVerifyReturnedBytes, false, \
1749 "Check that all the garbage collected was returned to the " \
1750 "free lists.") \
1751 \
1752 notproduct(bool, ScavengeALot, false, \
1753 "Force scavenge at every Nth exit from the runtime system " \
1754 "(N=ScavengeALotInterval)") \
1755 \
1756 develop(bool, FullGCALot, false, \
1757 "Force full gc at every Nth exit from the runtime system " \
1758 "(N=FullGCALotInterval)") \
1759 \
1760 notproduct(bool, GCALotAtAllSafepoints, false, \
1761 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1762 \
1763 product(bool, HandlePromotionFailure, true, \
1764 "The youngest generation collection does not require " \
1765 "a guarantee of full promotion of all live objects.") \
1766 \
1767 product(bool, PrintPromotionFailure, false, \
1768 "Print additional diagnostic information following " \
1769 " promotion failure") \
1770 \
1771 notproduct(bool, PromotionFailureALot, false, \
1772 "Use promotion failure handling on every youngest generation " \
1773 "collection") \
1774 \
1775 develop(uintx, PromotionFailureALotCount, 1000, \
1776 "Number of promotion failures occurring at ParGCAllocBuffer" \
1777 "refill attempts (ParNew) or promotion attempts " \
1778 "(other young collectors) ") \
1779 \
1780 develop(uintx, PromotionFailureALotInterval, 5, \
1781 "Total collections between promotion failures alot") \
1782 \
1783 develop(intx, WorkStealingSleepMillis, 1, \
1784 "Sleep time when sleep is used for yields") \
1785 \
1786 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1787 "Number of yields before a sleep is done during workstealing") \
1788 \
1789 develop(uintx, WorkStealingHardSpins, 4096, \
1790 "Number of iterations in a spin loop between checks on " \
1791 "time out of hard spin") \
1792 \
1793 develop(uintx, WorkStealingSpinToYieldRatio, 10, \
1794 "Ratio of hard spins to calls to yield") \
1795 \
1796 product(uintx, PreserveMarkStackSize, 1024, \
1797 "Size for stack used in promotion failure handling") \
1798 \
1799 develop(uintx, ObjArrayMarkingStride, 512, \
1800 "Number of ObjArray elements to push onto the marking stack" \
1801 "before pushing a continuation entry") \
1802 \
1803 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1804 \
1805 product_pd(bool, ResizeTLAB, \
1806 "Dynamically resize tlab size for threads") \
1807 \
1808 product(bool, ZeroTLAB, false, \
1809 "Zero out the newly created TLAB") \
1810 \
1811 product(bool, FastTLABRefill, true, \
1812 "Use fast TLAB refill code") \
1813 \
1814 product(bool, PrintTLAB, false, \
1815 "Print various TLAB related information") \
1816 \
1817 product(bool, TLABStats, true, \
1818 "Print various TLAB related information") \
1819 \
1820 product(bool, PrintRevisitStats, false, \
1821 "Print revisit (klass and MDO) stack related information") \
1822 \
1823 product_pd(bool, NeverActAsServerClassMachine, \
1824 "Never act like a server-class machine") \
1825 \
1826 product(bool, AlwaysActAsServerClassMachine, false, \
1827 "Always act like a server-class machine") \
1828 \
1829 product_pd(uint64_t, MaxRAM, \
1830 "Real memory size (in bytes) used to set maximum heap size") \
1831 \
1832 product(uintx, ErgoHeapSizeLimit, 0, \
1833 "Maximum ergonomically set heap size (in bytes); zero means use " \
1834 "MaxRAM / MaxRAMFraction") \
1835 \
1836 product(uintx, MaxRAMFraction, 4, \
1837 "Maximum fraction (1/n) of real memory used for maximum heap " \
1838 "size") \
1839 \
1840 product(uintx, DefaultMaxRAMFraction, 4, \
1841 "Maximum fraction (1/n) of real memory used for maximum heap " \
1842 "size; deprecated: to be renamed to MaxRAMFraction") \
1843 \
1844 product(uintx, MinRAMFraction, 2, \
1845 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1846 "size on systems with small physical memory size") \
1847 \
1848 product(uintx, InitialRAMFraction, 64, \
1849 "Fraction (1/n) of real memory used for initial heap size") \
1850 \
1851 product(bool, UseAutoGCSelectPolicy, false, \
1852 "Use automatic collection selection policy") \
1853 \
1854 product(uintx, AutoGCSelectPauseMillis, 5000, \
1855 "Automatic GC selection pause threshhold in ms") \
1856 \
1857 product(bool, UseAdaptiveSizePolicy, true, \
1858 "Use adaptive generation sizing policies") \
1859 \
1860 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1861 "Use adaptive survivor sizing policies") \
1862 \
1863 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1864 "Use adaptive young-old sizing policies at minor collections") \
1865 \
1866 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1867 "Use adaptive young-old sizing policies at major collections") \
1868 \
1869 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1870 "Use statistics from System.GC for adaptive size policy") \
1871 \
1872 product(bool, UseAdaptiveGCBoundary, false, \
1873 "Allow young-old boundary to move") \
1874 \
1875 develop(bool, TraceAdaptiveGCBoundary, false, \
1876 "Trace young-old boundary moves") \
1877 \
1878 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
1879 "Resize the virtual spaces of the young or old generations") \
1880 \
1881 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
1882 "Policy for changeing generation size for throughput goals") \
1883 \
1884 product(uintx, AdaptiveSizePausePolicy, 0, \
1885 "Policy for changing generation size for pause goals") \
1886 \
1887 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
1888 "Adjust tenured generation to achive a minor pause goal") \
1889 \
1890 develop(bool, PSAdjustYoungGenForMajorPause, false, \
1891 "Adjust young generation to achive a major pause goal") \
1892 \
1893 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
1894 "Number of steps where heuristics is used before data is used") \
1895 \
1896 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
1897 "Number of collections before the adaptive sizing is started") \
1898 \
1899 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
1900 "Collecton interval for printing information; zero => never") \
1901 \
1902 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
1903 "Use adaptive minimum footprint as a goal") \
1904 \
1905 product(uintx, AdaptiveSizePolicyWeight, 10, \
1906 "Weight given to exponential resizing, between 0 and 100") \
1907 \
1908 product(uintx, AdaptiveTimeWeight, 25, \
1909 "Weight given to time in adaptive policy, between 0 and 100") \
1910 \
1911 product(uintx, PausePadding, 1, \
1912 "How much buffer to keep for pause time") \
1913 \
1914 product(uintx, PromotedPadding, 3, \
1915 "How much buffer to keep for promotion failure") \
1916 \
1917 product(uintx, SurvivorPadding, 3, \
1918 "How much buffer to keep for survivor overflow") \
1919 \
1920 product(uintx, AdaptivePermSizeWeight, 20, \
1921 "Weight for perm gen exponential resizing, between 0 and 100") \
1922 \
1923 product(uintx, PermGenPadding, 3, \
1924 "How much buffer to keep for perm gen sizing") \
1925 \
1926 product(uintx, ThresholdTolerance, 10, \
1927 "Allowed collection cost difference between generations") \
1928 \
1929 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
1930 "If collection costs are within margin, reduce both by full " \
1931 "delta") \
1932 \
1933 product(uintx, YoungGenerationSizeIncrement, 20, \
1934 "Adaptive size percentage change in young generation") \
1935 \
1936 product(uintx, YoungGenerationSizeSupplement, 80, \
1937 "Supplement to YoungedGenerationSizeIncrement used at startup") \
1938 \
1939 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
1940 "Decay factor to YoungedGenerationSizeSupplement") \
1941 \
1942 product(uintx, TenuredGenerationSizeIncrement, 20, \
1943 "Adaptive size percentage change in tenured generation") \
1944 \
1945 product(uintx, TenuredGenerationSizeSupplement, 80, \
1946 "Supplement to TenuredGenerationSizeIncrement used at startup") \
1947 \
1948 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
1949 "Decay factor to TenuredGenerationSizeIncrement") \
1950 \
1951 product(uintx, MaxGCPauseMillis, max_uintx, \
1952 "Adaptive size policy maximum GC pause time goal in msec, " \
1953 "or (G1 Only) the max. GC time per MMU time slice") \
1954 \
1955 product(intx, GCPauseIntervalMillis, 500, \
1956 "Time slice for MMU specification") \
1957 \
1958 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
1959 "Adaptive size policy maximum GC minor pause time goal in msec") \
1960 \
1961 product(uintx, GCTimeRatio, 99, \
1962 "Adaptive size policy application time to GC time ratio") \
1963 \
1964 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
1965 "Adaptive size scale down factor for shrinking") \
1966 \
1967 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
1968 "Adaptive size decays the major cost for long major intervals") \
1969 \
1970 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
1971 "Time scale over which major costs decay") \
1972 \
1973 product(uintx, MinSurvivorRatio, 3, \
1974 "Minimum ratio of young generation/survivor space size") \
1975 \
1976 product(uintx, InitialSurvivorRatio, 8, \
1977 "Initial ratio of eden/survivor space size") \
1978 \
1979 product(uintx, BaseFootPrintEstimate, 256*M, \
1980 "Estimate of footprint other than Java Heap") \
1981 \
1982 product(bool, UseGCOverheadLimit, true, \
1983 "Use policy to limit of proportion of time spent in GC " \
1984 "before an OutOfMemory error is thrown") \
1985 \
1986 product(uintx, GCTimeLimit, 98, \
1987 "Limit of proportion of time spent in GC before an OutOfMemory" \
1988 "error is thrown (used with GCHeapFreeLimit)") \
1989 \
1990 product(uintx, GCHeapFreeLimit, 2, \
1991 "Minimum percentage of free space after a full GC before an " \
1992 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
1993 \
1994 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
1995 "Number of consecutive collections before gc time limit fires") \
1996 \
1997 product(bool, PrintAdaptiveSizePolicy, false, \
1998 "Print information about AdaptiveSizePolicy") \
1999 \
2000 product(intx, PrefetchCopyIntervalInBytes, -1, \
2001 "How far ahead to prefetch destination area (<= 0 means off)") \
2002 \
2003 product(intx, PrefetchScanIntervalInBytes, -1, \
2004 "How far ahead to prefetch scan area (<= 0 means off)") \
2005 \
2006 product(intx, PrefetchFieldsAhead, -1, \
2007 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2008 \
2009 develop(bool, UsePrefetchQueue, true, \
2010 "Use the prefetch queue during PS promotion") \
2011 \
2012 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2013 "Verify system before exiting") \
2014 \
2015 diagnostic(bool, VerifyBeforeGC, false, \
2016 "Verify memory system before GC") \
2017 \
2018 diagnostic(bool, VerifyAfterGC, false, \
2019 "Verify memory system after GC") \
2020 \
2021 diagnostic(bool, VerifyDuringGC, false, \
2022 "Verify memory system during GC (between phases)") \
2023 \
2024 diagnostic(bool, GCParallelVerificationEnabled, true, \
2025 "Enable parallel memory system verification") \
2026 \
2027 diagnostic(bool, DeferInitialCardMark, false, \
2028 "When +ReduceInitialCardMarks, explicitly defer any that " \
2029 "may arise from new_pre_store_barrier") \
2030 \
2031 diagnostic(bool, VerifyRememberedSets, false, \
2032 "Verify GC remembered sets") \
2033 \
2034 diagnostic(bool, VerifyObjectStartArray, true, \
2035 "Verify GC object start array if verify before/after") \
2036 \
2037 product(bool, DisableExplicitGC, false, \
2038 "Tells whether calling System.gc() does a full GC") \
2039 \
2040 notproduct(bool, CheckMemoryInitialization, false, \
2041 "Checks memory initialization") \
2042 \
2043 product(bool, CollectGen0First, false, \
2044 "Collect youngest generation before each full GC") \
2045 \
2046 diagnostic(bool, BindCMSThreadToCPU, false, \
2047 "Bind CMS Thread to CPU if possible") \
2048 \
2049 diagnostic(uintx, CPUForCMSThread, 0, \
2050 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2051 \
2052 product(bool, BindGCTaskThreadsToCPUs, false, \
2053 "Bind GCTaskThreads to CPUs if possible") \
2054 \
2055 product(bool, UseGCTaskAffinity, false, \
2056 "Use worker affinity when asking for GCTasks") \
2057 \
2058 product(uintx, ProcessDistributionStride, 4, \
2059 "Stride through processors when distributing processes") \
2060 \
2061 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2062 "number of times the coordinator GC thread will sleep while " \
2063 "yielding before giving up and resuming GC") \
2064 \
2065 product(uintx, CMSYieldSleepCount, 0, \
2066 "number of times a GC thread (minus the coordinator) " \
2067 "will sleep while yielding before giving up and resuming GC") \
2068 \
2069 /* gc tracing */ \
2070 manageable(bool, PrintGC, false, \
2071 "Print message at garbage collect") \
2072 \
2073 manageable(bool, PrintGCDetails, false, \
2074 "Print more details at garbage collect") \
2075 \
2076 manageable(bool, PrintGCDateStamps, false, \
2077 "Print date stamps at garbage collect") \
2078 \
2079 manageable(bool, PrintGCTimeStamps, false, \
2080 "Print timestamps at garbage collect") \
2081 \
2082 product(bool, PrintGCTaskTimeStamps, false, \
2083 "Print timestamps for individual gc worker thread tasks") \
2084 \
2085 develop(intx, ConcGCYieldTimeout, 0, \
2086 "If non-zero, assert that GC threads yield within this # of ms.") \
2087 \
2088 notproduct(bool, TraceMarkSweep, false, \
2089 "Trace mark sweep") \
2090 \
2091 product(bool, PrintReferenceGC, false, \
2092 "Print times spent handling reference objects during GC " \
2093 " (enabled only when PrintGCDetails)") \
2094 \
2095 develop(bool, TraceReferenceGC, false, \
2096 "Trace handling of soft/weak/final/phantom references") \
2097 \
2098 develop(bool, TraceFinalizerRegistration, false, \
2099 "Trace registration of final references") \
2100 \
2101 notproduct(bool, TraceScavenge, false, \
2102 "Trace scavenge") \
2103 \
2104 product_rw(bool, TraceClassLoading, false, \
2105 "Trace all classes loaded") \
2106 \
2107 product(bool, TraceClassLoadingPreorder, false, \
2108 "Trace all classes loaded in order referenced (not loaded)") \
2109 \
2110 product_rw(bool, TraceClassUnloading, false, \
2111 "Trace unloading of classes") \
2112 \
2113 product_rw(bool, TraceLoaderConstraints, false, \
2114 "Trace loader constraints") \
2115 \
2116 product(bool, TraceGen0Time, false, \
2117 "Trace accumulated time for Gen 0 collection") \
2118 \
2119 product(bool, TraceGen1Time, false, \
2120 "Trace accumulated time for Gen 1 collection") \
2121 \
2122 product(bool, PrintTenuringDistribution, false, \
2123 "Print tenuring age information") \
2124 \
2125 product_rw(bool, PrintHeapAtGC, false, \
2126 "Print heap layout before and after each GC") \
2127 \
2128 product_rw(bool, PrintHeapAtGCExtended, false, \
2129 "Prints extended information about the layout of the heap " \
2130 "when -XX:+PrintHeapAtGC is set") \
2131 \
2132 product(bool, PrintHeapAtSIGBREAK, true, \
2133 "Print heap layout in response to SIGBREAK") \
2134 \
2135 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2136 "Print a class histogram before any major stop-world GC") \
2137 \
2138 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2139 "Print a class histogram after any major stop-world GC") \
2140 \
2141 manageable(bool, PrintClassHistogram, false, \
2142 "Print a histogram of class instances") \
2143 \
2144 develop(bool, TraceWorkGang, false, \
2145 "Trace activities of work gangs") \
2146 \
2147 product(bool, TraceParallelOldGCTasks, false, \
2148 "Trace multithreaded GC activity") \
2149 \
2150 develop(bool, TraceBlockOffsetTable, false, \
2151 "Print BlockOffsetTable maps") \
2152 \
2153 develop(bool, TraceCardTableModRefBS, false, \
2154 "Print CardTableModRefBS maps") \
2155 \
2156 develop(bool, TraceGCTaskManager, false, \
2157 "Trace actions of the GC task manager") \
2158 \
2159 develop(bool, TraceGCTaskQueue, false, \
2160 "Trace actions of the GC task queues") \
2161 \
2162 develop(bool, TraceGCTaskThread, false, \
2163 "Trace actions of the GC task threads") \
2164 \
2165 product(bool, PrintParallelOldGCPhaseTimes, false, \
2166 "Print the time taken by each parallel old gc phase." \
2167 "PrintGCDetails must also be enabled.") \
2168 \
2169 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2170 "Trace parallel old gc marking phase") \
2171 \
2172 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2173 "Trace parallel old gc summary phase") \
2174 \
2175 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2176 "Trace parallel old gc compaction phase") \
2177 \
2178 develop(bool, TraceParallelOldGCDensePrefix, false, \
2179 "Trace parallel old gc dense prefix computation") \
2180 \
2181 develop(bool, IgnoreLibthreadGPFault, false, \
2182 "Suppress workaround for libthread GP fault") \
2183 \
2184 product(bool, PrintJNIGCStalls, false, \
2185 "Print diagnostic message when GC is stalled" \
2186 "by JNI critical section") \
2187 \
2188 /* JVMTI heap profiling */ \
2189 \
2190 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2191 "Trace JVMTI object tagging calls") \
2192 \
2193 diagnostic(bool, VerifyBeforeIteration, false, \
2194 "Verify memory system before JVMTI iteration") \
2195 \
2196 /* compiler interface */ \
2197 \
2198 develop(bool, CIPrintCompilerName, false, \
2199 "when CIPrint is active, print the name of the active compiler") \
2200 \
2201 develop(bool, CIPrintCompileQueue, false, \
2202 "display the contents of the compile queue whenever a " \
2203 "compilation is enqueued") \
2204 \
2205 develop(bool, CIPrintRequests, false, \
2206 "display every request for compilation") \
2207 \
2208 product(bool, CITime, false, \
2209 "collect timing information for compilation") \
2210 \
2211 develop(bool, CITimeEach, false, \
2212 "display timing information after each successful compilation") \
2213 \
2214 develop(bool, CICountOSR, true, \
2215 "use a separate counter when assigning ids to osr compilations") \
2216 \
2217 develop(bool, CICompileNatives, true, \
2218 "compile native methods if supported by the compiler") \
2219 \
2220 develop_pd(bool, CICompileOSR, \
2221 "compile on stack replacement methods if supported by the " \
2222 "compiler") \
2223 \
2224 develop(bool, CIPrintMethodCodes, false, \
2225 "print method bytecodes of the compiled code") \
2226 \
2227 develop(bool, CIPrintTypeFlow, false, \
2228 "print the results of ciTypeFlow analysis") \
2229 \
2230 develop(bool, CITraceTypeFlow, false, \
2231 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2232 \
2233 develop(intx, CICloneLoopTestLimit, 100, \
2234 "size limit for blocks heuristically cloned in ciTypeFlow") \
2235 \
2236 /* temp diagnostics */ \
2237 \
2238 diagnostic(bool, TraceRedundantCompiles, false, \
2239 "Have compile broker print when a request already in the queue is"\
2240 " requested again") \
2241 \
2242 diagnostic(bool, InitialCompileFast, false, \
2243 "Initial compile at CompLevel_fast_compile") \
2244 \
2245 diagnostic(bool, InitialCompileReallyFast, false, \
2246 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2247 \
2248 diagnostic(bool, FullProfileOnReInterpret, true, \
2249 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2250 \
2251 /* compiler */ \
2252 \
2253 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2254 "Number of compiler threads to run") \
2255 \
2256 product(intx, CompilationPolicyChoice, 0, \
2257 "which compilation policy (0/1)") \
2258 \
2259 develop(bool, UseStackBanging, true, \
2260 "use stack banging for stack overflow checks (required for " \
2261 "proper StackOverflow handling; disable only to measure cost " \
2262 "of stackbanging)") \
2263 \
2264 develop(bool, Use24BitFPMode, true, \
2265 "Set 24-bit FPU mode on a per-compile basis ") \
2266 \
2267 develop(bool, Use24BitFP, true, \
2268 "use FP instructions that produce 24-bit precise results") \
2269 \
2270 develop(bool, UseStrictFP, true, \
2271 "use strict fp if modifier strictfp is set") \
2272 \
2273 develop(bool, GenerateSynchronizationCode, true, \
2274 "generate locking/unlocking code for synchronized methods and " \
2275 "monitors") \
2276 \
2277 develop(bool, GenerateCompilerNullChecks, true, \
2278 "Generate explicit null checks for loads/stores/calls") \
2279 \
2280 develop(bool, GenerateRangeChecks, true, \
2281 "Generate range checks for array accesses") \
2282 \
2283 develop_pd(bool, ImplicitNullChecks, \
2284 "generate code for implicit null checks") \
2285 \
2286 product(bool, PrintSafepointStatistics, false, \
2287 "print statistics about safepoint synchronization") \
2288 \
2289 product(intx, PrintSafepointStatisticsCount, 300, \
2290 "total number of safepoint statistics collected " \
2291 "before printing them out") \
2292 \
2293 product(intx, PrintSafepointStatisticsTimeout, -1, \
2294 "print safepoint statistics only when safepoint takes" \
2295 " more than PrintSafepointSatisticsTimeout in millis") \
2296 \
2297 product(bool, TraceSafepointCleanupTime, false, \
2298 "print the break down of clean up tasks performed during" \
2299 " safepoint") \
2300 \
2301 develop(bool, InlineAccessors, true, \
2302 "inline accessor methods (get/set)") \
2303 \
2304 product(bool, Inline, true, \
2305 "enable inlining") \
2306 \
2307 product(bool, ClipInlining, true, \
2308 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2309 \
2310 develop(bool, UseCHA, true, \
2311 "enable CHA") \
2312 \
2313 product(bool, UseTypeProfile, true, \
2314 "Check interpreter profile for historically monomorphic calls") \
2315 \
2316 product(intx, TypeProfileMajorReceiverPercent, 90, \
2317 "% of major receiver type to all profiled receivers") \
2318 \
2319 notproduct(bool, TimeCompiler, false, \
2320 "time the compiler") \
2321 \
2322 notproduct(bool, TimeCompiler2, false, \
2323 "detailed time the compiler (requires +TimeCompiler)") \
2324 \
2325 diagnostic(bool, PrintInlining, false, \
2326 "prints inlining optimizations") \
2327 \
2328 diagnostic(bool, PrintIntrinsics, false, \
2329 "prints attempted and successful inlining of intrinsics") \
2330 \
2331 product(bool, UseCountLeadingZerosInstruction, false, \
2332 "Use count leading zeros instruction") \
2333 \
2334 product(bool, UsePopCountInstruction, false, \
2335 "Use population count instruction") \
2336 \
2337 diagnostic(ccstrlist, DisableIntrinsic, "", \
2338 "do not expand intrinsics whose (internal) names appear here") \
2339 \
2340 develop(bool, StressReflectiveCode, false, \
2341 "Use inexact types at allocations, etc., to test reflection") \
2342 \
2343 develop(bool, EagerInitialization, false, \
2344 "Eagerly initialize classes if possible") \
2345 \
2346 product(bool, Tier1UpdateMethodData, trueInTiered, \
2347 "Update methodDataOops in Tier1-generated code") \
2348 \
2349 develop(bool, TraceMethodReplacement, false, \
2350 "Print when methods are replaced do to recompilation") \
2351 \
2352 develop(bool, PrintMethodFlushing, false, \
2353 "print the nmethods being flushed") \
2354 \
2355 notproduct(bool, LogMultipleMutexLocking, false, \
2356 "log locking and unlocking of mutexes (only if multiple locks " \
2357 "are held)") \
2358 \
2359 develop(bool, UseRelocIndex, false, \
2360 "use an index to speed random access to relocations") \
2361 \
2362 develop(bool, StressCodeBuffers, false, \
2363 "Exercise code buffer expansion and other rare state changes") \
2364 \
2365 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2366 "Generate extra debugging info for non-safepoints in nmethods") \
2367 \
2368 diagnostic(bool, DebugInlinedCalls, true, \
2369 "If false, restricts profiled locations to the root method only") \
2370 \
2371 product(bool, PrintVMOptions, trueInDebug, \
2372 "Print flags that appeared on the command line") \
2373 \
2374 product(bool, IgnoreUnrecognizedVMOptions, false, \
2375 "Ignore unrecognized VM options") \
2376 \
2377 product(bool, PrintCommandLineFlags, false, \
2378 "Print flags specified on command line or set by ergonomics") \
2379 \
2380 product(bool, PrintFlagsInitial, false, \
2381 "Print all VM flags before argument processing and exit VM") \
2382 \
2383 product(bool, PrintFlagsFinal, false, \
2384 "Print all VM flags after argument and ergonomic processing") \
2385 \
2386 diagnostic(bool, SerializeVMOutput, true, \
2387 "Use a mutex to serialize output to tty and hotspot.log") \
2388 \
2389 diagnostic(bool, DisplayVMOutput, true, \
2390 "Display all VM output on the tty, independently of LogVMOutput") \
2391 \
2392 diagnostic(bool, LogVMOutput, trueInDebug, \
2393 "Save VM output to hotspot.log, or to LogFile") \
2394 \
2395 diagnostic(ccstr, LogFile, NULL, \
2396 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2397 \
2398 product(ccstr, ErrorFile, NULL, \
2399 "If an error occurs, save the error data to this file " \
2400 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2401 \
2402 product(bool, DisplayVMOutputToStderr, false, \
2403 "If DisplayVMOutput is true, display all VM output to stderr") \
2404 \
2405 product(bool, DisplayVMOutputToStdout, false, \
2406 "If DisplayVMOutput is true, display all VM output to stdout") \
2407 \
2408 product(bool, UseHeavyMonitors, false, \
2409 "use heavyweight instead of lightweight Java monitors") \
2410 \
2411 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2412 "print histogram of the symbol table") \
2413 \
2414 notproduct(bool, ExitVMOnVerifyError, false, \
2415 "standard exit from VM if bytecode verify error " \
2416 "(only in debug mode)") \
2417 \
2418 notproduct(ccstr, AbortVMOnException, NULL, \
2419 "Call fatal if this exception is thrown. Example: " \
2420 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2421 \
2422 develop(bool, DebugVtables, false, \
2423 "add debugging code to vtable dispatch") \
2424 \
2425 develop(bool, PrintVtables, false, \
2426 "print vtables when printing klass") \
2427 \
2428 notproduct(bool, PrintVtableStats, false, \
2429 "print vtables stats at end of run") \
2430 \
2431 develop(bool, TraceCreateZombies, false, \
2432 "trace creation of zombie nmethods") \
2433 \
2434 notproduct(bool, IgnoreLockingAssertions, false, \
2435 "disable locking assertions (for speed)") \
2436 \
2437 notproduct(bool, VerifyLoopOptimizations, false, \
2438 "verify major loop optimizations") \
2439 \
2440 product(bool, RangeCheckElimination, true, \
2441 "Split loop iterations to eliminate range checks") \
2442 \
2443 develop_pd(bool, UncommonNullCast, \
2444 "track occurrences of null in casts; adjust compiler tactics") \
2445 \
2446 develop(bool, TypeProfileCasts, true, \
2447 "treat casts like calls for purposes of type profiling") \
2448 \
2449 develop(bool, MonomorphicArrayCheck, true, \
2450 "Uncommon-trap array store checks that require full type check") \
2451 \
2452 develop(bool, DelayCompilationDuringStartup, true, \
2453 "Delay invoking the compiler until main application class is " \
2454 "loaded") \
2455 \
2456 develop(bool, CompileTheWorld, false, \
2457 "Compile all methods in all classes in bootstrap class path " \
2458 "(stress test)") \
2459 \
2460 develop(bool, CompileTheWorldPreloadClasses, true, \
2461 "Preload all classes used by a class before start loading") \
2462 \
2463 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2464 "Compile all methods although class initializer failed") \
2465 \
2466 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2467 "Force a safepoint every n compiles so sweeper can keep up") \
2468 \
2469 develop(bool, TraceIterativeGVN, false, \
2470 "Print progress during Iterative Global Value Numbering") \
2471 \
2472 develop(bool, FillDelaySlots, true, \
2473 "Fill delay slots (on SPARC only)") \
2474 \
2475 develop(bool, VerifyIterativeGVN, false, \
2476 "Verify Def-Use modifications during sparse Iterative Global " \
2477 "Value Numbering") \
2478 \
2479 notproduct(bool, TracePhaseCCP, false, \
2480 "Print progress during Conditional Constant Propagation") \
2481 \
2482 develop(bool, TimeLivenessAnalysis, false, \
2483 "Time computation of bytecode liveness analysis") \
2484 \
2485 develop(bool, TraceLivenessGen, false, \
2486 "Trace the generation of liveness analysis information") \
2487 \
2488 notproduct(bool, TraceLivenessQuery, false, \
2489 "Trace queries of liveness analysis information") \
2490 \
2491 notproduct(bool, CollectIndexSetStatistics, false, \
2492 "Collect information about IndexSets") \
2493 \
2494 develop(bool, PrintDominators, false, \
2495 "Print out dominator trees for GVN") \
2496 \
2497 develop(bool, UseLoopSafepoints, true, \
2498 "Generate Safepoint nodes in every loop") \
2499 \
2500 notproduct(bool, TraceCISCSpill, false, \
2501 "Trace allocators use of cisc spillable instructions") \
2502 \
2503 notproduct(bool, TraceSpilling, false, \
2504 "Trace spilling") \
2505 \
2506 product(bool, SplitIfBlocks, true, \
2507 "Clone compares and control flow through merge points to fold " \
2508 "some branches") \
2509 \
2510 develop(intx, FastAllocateSizeLimit, 128*K, \
2511 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2512 "Inline allocations larger than this in doublewords must go slow")\
2513 \
2514 product(bool, AggressiveOpts, false, \
2515 "Enable aggressive optimizations - see arguments.cpp") \
2516 \
2517 product(bool, UseStringCache, false, \
2518 "Enable String cache capabilities on String.java") \
2519 \
2520 /* statistics */ \
2521 develop(bool, UseVTune, false, \
2522 "enable support for Intel's VTune profiler") \
2523 \
2524 develop(bool, CountCompiledCalls, false, \
2525 "counts method invocations") \
2526 \
2527 notproduct(bool, CountRuntimeCalls, false, \
2528 "counts VM runtime calls") \
2529 \
2530 develop(bool, CountJNICalls, false, \
2531 "counts jni method invocations") \
2532 \
2533 notproduct(bool, CountJVMCalls, false, \
2534 "counts jvm method invocations") \
2535 \
2536 notproduct(bool, CountRemovableExceptions, false, \
2537 "count exceptions that could be replaced by branches due to " \
2538 "inlining") \
2539 \
2540 notproduct(bool, ICMissHistogram, false, \
2541 "produce histogram of IC misses") \
2542 \
2543 notproduct(bool, PrintClassStatistics, false, \
2544 "prints class statistics at end of run") \
2545 \
2546 notproduct(bool, PrintMethodStatistics, false, \
2547 "prints method statistics at end of run") \
2548 \
2549 /* interpreter */ \
2550 develop(bool, ClearInterpreterLocals, false, \
2551 "Always clear local variables of interpreter activations upon " \
2552 "entry") \
2553 \
2554 product_pd(bool, RewriteBytecodes, \
2555 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2556 \
2557 product_pd(bool, RewriteFrequentPairs, \
2558 "Rewrite frequently used bytecode pairs into a single bytecode") \
2559 \
2560 diagnostic(bool, PrintInterpreter, false, \
2561 "Prints the generated interpreter code") \
2562 \
2563 product(bool, UseInterpreter, true, \
2564 "Use interpreter for non-compiled methods") \
2565 \
2566 develop(bool, UseFastSignatureHandlers, true, \
2567 "Use fast signature handlers for native calls") \
2568 \
2569 develop(bool, UseV8InstrsOnly, false, \
2570 "Use SPARC-V8 Compliant instruction subset") \
2571 \
2572 product(bool, UseNiagaraInstrs, false, \
2573 "Use Niagara-efficient instruction subset") \
2574 \
2575 develop(bool, UseCASForSwap, false, \
2576 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2577 \
2578 product(bool, UseLoopCounter, true, \
2579 "Increment invocation counter on backward branch") \
2580 \
2581 product(bool, UseFastEmptyMethods, true, \
2582 "Use fast method entry code for empty methods") \
2583 \
2584 product(bool, UseFastAccessorMethods, true, \
2585 "Use fast method entry code for accessor methods") \
2586 \
2587 product_pd(bool, UseOnStackReplacement, \
2588 "Use on stack replacement, calls runtime if invoc. counter " \
2589 "overflows in loop") \
2590 \
2591 notproduct(bool, TraceOnStackReplacement, false, \
2592 "Trace on stack replacement") \
2593 \
2594 develop(bool, PoisonOSREntry, true, \
2595 "Detect abnormal calls to OSR code") \
2596 \
2597 product_pd(bool, PreferInterpreterNativeStubs, \
2598 "Use always interpreter stubs for native methods invoked via " \
2599 "interpreter") \
2600 \
2601 develop(bool, CountBytecodes, false, \
2602 "Count number of bytecodes executed") \
2603 \
2604 develop(bool, PrintBytecodeHistogram, false, \
2605 "Print histogram of the executed bytecodes") \
2606 \
2607 develop(bool, PrintBytecodePairHistogram, false, \
2608 "Print histogram of the executed bytecode pairs") \
2609 \
2610 diagnostic(bool, PrintSignatureHandlers, false, \
2611 "Print code generated for native method signature handlers") \
2612 \
2613 develop(bool, VerifyOops, false, \
2614 "Do plausibility checks for oops") \
2615 \
2616 develop(bool, CheckUnhandledOops, false, \
2617 "Check for unhandled oops in VM code") \
2618 \
2619 develop(bool, VerifyJNIFields, trueInDebug, \
2620 "Verify jfieldIDs for instance fields") \
2621 \
2622 notproduct(bool, VerifyJNIEnvThread, false, \
2623 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2624 "from JNI") \
2625 \
2626 develop(bool, VerifyFPU, false, \
2627 "Verify FPU state (check for NaN's, etc.)") \
2628 \
2629 develop(bool, VerifyThread, false, \
2630 "Watch the thread register for corruption (SPARC only)") \
2631 \
2632 develop(bool, VerifyActivationFrameSize, false, \
2633 "Verify that activation frame didn't become smaller than its " \
2634 "minimal size") \
2635 \
2636 develop(bool, TraceFrequencyInlining, false, \
2637 "Trace frequency based inlining") \
2638 \
2639 notproduct(bool, TraceTypeProfile, false, \
2640 "Trace type profile") \
2641 \
2642 develop_pd(bool, InlineIntrinsics, \
2643 "Inline intrinsics that can be statically resolved") \
2644 \
2645 product_pd(bool, ProfileInterpreter, \
2646 "Profile at the bytecode level during interpretation") \
2647 \
2648 develop_pd(bool, ProfileTraps, \
2649 "Profile deoptimization traps at the bytecode level") \
2650 \
2651 product(intx, ProfileMaturityPercentage, 20, \
2652 "number of method invocations/branches (expressed as % of " \
2653 "CompileThreshold) before using the method's profile") \
2654 \
2655 develop(bool, PrintMethodData, false, \
2656 "Print the results of +ProfileInterpreter at end of run") \
2657 \
2658 develop(bool, VerifyDataPointer, trueInDebug, \
2659 "Verify the method data pointer during interpreter profiling") \
2660 \
2661 develop(bool, VerifyCompiledCode, false, \
2662 "Include miscellaneous runtime verifications in nmethod code; " \
2663 "default off because it disturbs nmethod size heuristics") \
2664 \
2665 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2666 "Manually make GC thread crash then dump java stack trace; " \
2667 "Test only") \
2668 \
2669 /* compilation */ \
2670 product(bool, UseCompiler, true, \
2671 "use compilation") \
2672 \
2673 develop(bool, TraceCompilationPolicy, false, \
2674 "Trace compilation policy") \
2675 \
2676 develop(bool, TimeCompilationPolicy, false, \
2677 "Time the compilation policy") \
2678 \
2679 product(bool, UseCounterDecay, true, \
2680 "adjust recompilation counters") \
2681 \
2682 develop(intx, CounterHalfLifeTime, 30, \
2683 "half-life time of invocation counters (in secs)") \
2684 \
2685 develop(intx, CounterDecayMinIntervalLength, 500, \
2686 "Min. ms. between invocation of CounterDecay") \
2687 \
2688 product(bool, AlwaysCompileLoopMethods, false, \
2689 "when using recompilation, never interpret methods " \
2690 "containing loops") \
2691 \
2692 product(bool, DontCompileHugeMethods, true, \
2693 "don't compile methods > HugeMethodLimit") \
2694 \
2695 /* Bytecode escape analysis estimation. */ \
2696 product(bool, EstimateArgEscape, true, \
2697 "Analyze bytecodes to estimate escape state of arguments") \
2698 \
2699 product(intx, BCEATraceLevel, 0, \
2700 "How much tracing to do of bytecode escape analysis estimates") \
2701 \
2702 product(intx, MaxBCEAEstimateLevel, 5, \
2703 "Maximum number of nested calls that are analyzed by BC EA.") \
2704 \
2705 product(intx, MaxBCEAEstimateSize, 150, \
2706 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2707 \
2708 product(intx, AllocatePrefetchStyle, 1, \
2709 "0 = no prefetch, " \
2710 "1 = prefetch instructions for each allocation, " \
2711 "2 = use TLAB watermark to gate allocation prefetch, " \
2712 "3 = use BIS instruction on Sparc for allocation prefetch") \
2713 \
2714 product(intx, AllocatePrefetchDistance, -1, \
2715 "Distance to prefetch ahead of allocation pointer") \
2716 \
2717 product(intx, AllocatePrefetchLines, 1, \
2718 "Number of lines to prefetch ahead of allocation pointer") \
2719 \
2720 product(intx, AllocatePrefetchStepSize, 16, \
2721 "Step size in bytes of sequential prefetch instructions") \
2722 \
2723 product(intx, AllocatePrefetchInstr, 0, \
2724 "Prefetch instruction to prefetch ahead of allocation pointer") \
2725 \
2726 product(intx, ReadPrefetchInstr, 0, \
2727 "Prefetch instruction to prefetch ahead") \
2728 \
2729 /* deoptimization */ \
2730 develop(bool, TraceDeoptimization, false, \
2731 "Trace deoptimization") \
2732 \
2733 develop(bool, DebugDeoptimization, false, \
2734 "Tracing various information while debugging deoptimization") \
2735 \
2736 product(intx, SelfDestructTimer, 0, \
2737 "Will cause VM to terminate after a given time (in minutes) " \
2738 "(0 means off)") \
2739 \
2740 product(intx, MaxJavaStackTraceDepth, 1024, \
2741 "Max. no. of lines in the stack trace for Java exceptions " \
2742 "(0 means all)") \
2743 \
2744 develop(intx, GuaranteedSafepointInterval, 1000, \
2745 "Guarantee a safepoint (at least) every so many milliseconds " \
2746 "(0 means none)") \
2747 \
2748 product(intx, SafepointTimeoutDelay, 10000, \
2749 "Delay in milliseconds for option SafepointTimeout") \
2750 \
2751 product(intx, NmethodSweepFraction, 4, \
2752 "Number of invocations of sweeper to cover all nmethods") \
2753 \
2754 notproduct(intx, MemProfilingInterval, 500, \
2755 "Time between each invocation of the MemProfiler") \
2756 \
2757 develop(intx, MallocCatchPtr, -1, \
2758 "Hit breakpoint when mallocing/freeing this pointer") \
2759 \
2760 notproduct(intx, AssertRepeat, 1, \
2761 "number of times to evaluate expression in assert " \
2762 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2763 \
2764 notproduct(ccstrlist, SuppressErrorAt, "", \
2765 "List of assertions (file:line) to muzzle") \
2766 \
2767 notproduct(uintx, HandleAllocationLimit, 1024, \
2768 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2769 "is used") \
2770 \
2771 develop(uintx, TotalHandleAllocationLimit, 1024, \
2772 "Threshold for total handle allocation when " \
2773 "+TraceHandleAllocation is used") \
2774 \
2775 develop(intx, StackPrintLimit, 100, \
2776 "number of stack frames to print in VM-level stack dump") \
2777 \
2778 notproduct(intx, MaxElementPrintSize, 256, \
2779 "maximum number of elements to print") \
2780 \
2781 notproduct(intx, MaxSubklassPrintSize, 4, \
2782 "maximum number of subklasses to print when printing klass") \
2783 \
2784 product(intx, MaxInlineLevel, 9, \
2785 "maximum number of nested calls that are inlined") \
2786 \
2787 product(intx, MaxRecursiveInlineLevel, 1, \
2788 "maximum number of nested recursive calls that are inlined") \
2789 \
2790 product_pd(intx, InlineSmallCode, \
2791 "Only inline already compiled methods if their code size is " \
2792 "less than this") \
2793 \
2794 product(intx, MaxInlineSize, 35, \
2795 "maximum bytecode size of a method to be inlined") \
2796 \
2797 product_pd(intx, FreqInlineSize, \
2798 "maximum bytecode size of a frequent method to be inlined") \
2799 \
2800 product(intx, MaxTrivialSize, 6, \
2801 "maximum bytecode size of a trivial method to be inlined") \
2802 \
2803 product(intx, MinInliningThreshold, 250, \
2804 "min. invocation count a method needs to have to be inlined") \
2805 \
2806 develop(intx, AlignEntryCode, 4, \
2807 "aligns entry code to specified value (in bytes)") \
2808 \
2809 develop(intx, MethodHistogramCutoff, 100, \
2810 "cutoff value for method invoc. histogram (+CountCalls)") \
2811 \
2812 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2813 "# of interpreted methods to show in profile") \
2814 \
2815 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2816 "# of compiled methods to show in profile") \
2817 \
2818 develop(intx, ProfilerNumberOfStubMethods, 25, \
2819 "# of stub methods to show in profile") \
2820 \
2821 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2822 "# of runtime stub nodes to show in profile") \
2823 \
2824 product(intx, ProfileIntervalsTicks, 100, \
2825 "# of ticks between printing of interval profile " \
2826 "(+ProfileIntervals)") \
2827 \
2828 notproduct(intx, ScavengeALotInterval, 1, \
2829 "Interval between which scavenge will occur with +ScavengeALot") \
2830 \
2831 notproduct(intx, FullGCALotInterval, 1, \
2832 "Interval between which full gc will occur with +FullGCALot") \
2833 \
2834 notproduct(intx, FullGCALotStart, 0, \
2835 "For which invocation to start FullGCAlot") \
2836 \
2837 notproduct(intx, FullGCALotDummies, 32*K, \
2838 "Dummy object allocated with +FullGCALot, forcing all objects " \
2839 "to move") \
2840 \
2841 develop(intx, DontYieldALotInterval, 10, \
2842 "Interval between which yields will be dropped (milliseconds)") \
2843 \
2844 develop(intx, MinSleepInterval, 1, \
2845 "Minimum sleep() interval (milliseconds) when " \
2846 "ConvertSleepToYield is off (used for SOLARIS)") \
2847 \
2848 product(intx, EventLogLength, 2000, \
2849 "maximum nof events in event log") \
2850 \
2851 develop(intx, ProfilerPCTickThreshold, 15, \
2852 "Number of ticks in a PC buckets to be a hotspot") \
2853 \
2854 notproduct(intx, DeoptimizeALotInterval, 5, \
2855 "Number of exits until DeoptimizeALot kicks in") \
2856 \
2857 notproduct(intx, ZombieALotInterval, 5, \
2858 "Number of exits until ZombieALot kicks in") \
2859 \
2860 develop(bool, StressNonEntrant, false, \
2861 "Mark nmethods non-entrant at registration") \
2862 \
2863 diagnostic(intx, MallocVerifyInterval, 0, \
2864 "if non-zero, verify C heap after every N calls to " \
2865 "malloc/realloc/free") \
2866 \
2867 diagnostic(intx, MallocVerifyStart, 0, \
2868 "if non-zero, start verifying C heap after Nth call to " \
2869 "malloc/realloc/free") \
2870 \
2871 product(intx, TypeProfileWidth, 2, \
2872 "number of receiver types to record in call/cast profile") \
2873 \
2874 develop(intx, BciProfileWidth, 2, \
2875 "number of return bci's to record in ret profile") \
2876 \
2877 product(intx, PerMethodRecompilationCutoff, 400, \
2878 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2879 \
2880 product(intx, PerBytecodeRecompilationCutoff, 200, \
2881 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2882 \
2883 product(intx, PerMethodTrapLimit, 100, \
2884 "Limit on traps (of one kind) in a method (includes inlines)") \
2885 \
2886 product(intx, PerBytecodeTrapLimit, 4, \
2887 "Limit on traps (of one kind) at a particular BCI") \
2888 \
2889 develop(intx, FreqCountInvocations, 1, \
2890 "Scaling factor for branch frequencies (deprecated)") \
2891 \
2892 develop(intx, InlineFrequencyRatio, 20, \
2893 "Ratio of call site execution to caller method invocation") \
2894 \
2895 develop_pd(intx, InlineFrequencyCount, \
2896 "Count of call site execution necessary to trigger frequent " \
2897 "inlining") \
2898 \
2899 develop(intx, InlineThrowCount, 50, \
2900 "Force inlining of interpreted methods that throw this often") \
2901 \
2902 develop(intx, InlineThrowMaxSize, 200, \
2903 "Force inlining of throwing methods smaller than this") \
2904 \
2905 product(intx, AliasLevel, 3, \
2906 "0 for no aliasing, 1 for oop/field/static/array split, " \
2907 "2 for class split, 3 for unique instances") \
2908 \
2909 develop(bool, VerifyAliases, false, \
2910 "perform extra checks on the results of alias analysis") \
2911 \
2912 develop(intx, ProfilerNodeSize, 1024, \
2913 "Size in K to allocate for the Profile Nodes of each thread") \
2914 \
2915 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
2916 "Number of times to spin wait on a v8 atomic operation lock") \
2917 \
2918 product(intx, ReadSpinIterations, 100, \
2919 "Number of read attempts before a yield (spin inner loop)") \
2920 \
2921 product_pd(intx, PreInflateSpin, \
2922 "Number of times to spin wait before inflation") \
2923 \
2924 product(intx, PreBlockSpin, 10, \
2925 "Number of times to spin in an inflated lock before going to " \
2926 "an OS lock") \
2927 \
2928 /* gc parameters */ \
2929 product(uintx, InitialHeapSize, 0, \
2930 "Initial heap size (in bytes); zero means OldSize + NewSize") \
2931 \
2932 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
2933 "Maximum heap size (in bytes)") \
2934 \
2935 product(uintx, OldSize, ScaleForWordSize(4*M), \
2936 "Initial tenured generation size (in bytes)") \
2937 \
2938 product(uintx, NewSize, ScaleForWordSize(1*M), \
2939 "Initial new generation size (in bytes)") \
2940 \
2941 product(uintx, MaxNewSize, max_uintx, \
2942 "Maximum new generation size (in bytes), max_uintx means set " \
2943 "ergonomically") \
2944 \
2945 product(uintx, PretenureSizeThreshold, 0, \
2946 "Maximum size in bytes of objects allocated in DefNew " \
2947 "generation; zero means no maximum") \
2948 \
2949 product(uintx, TLABSize, 0, \
2950 "Starting TLAB size (in bytes); zero means set ergonomically") \
2951 \
2952 product(uintx, MinTLABSize, 2*K, \
2953 "Minimum allowed TLAB size (in bytes)") \
2954 \
2955 product(uintx, TLABAllocationWeight, 35, \
2956 "Allocation averaging weight") \
2957 \
2958 product(uintx, TLABWasteTargetPercent, 1, \
2959 "Percentage of Eden that can be wasted") \
2960 \
2961 product(uintx, TLABRefillWasteFraction, 64, \
2962 "Max TLAB waste at a refill (internal fragmentation)") \
2963 \
2964 product(uintx, TLABWasteIncrement, 4, \
2965 "Increment allowed waste at slow allocation") \
2966 \
2967 product(intx, SurvivorRatio, 8, \
2968 "Ratio of eden/survivor space size") \
2969 \
2970 product(intx, NewRatio, 2, \
2971 "Ratio of new/old generation sizes") \
2972 \
2973 product(uintx, MaxLiveObjectEvacuationRatio, 100, \
2974 "Max percent of eden objects that will be live at scavenge") \
2975 \
2976 product_pd(uintx, NewSizeThreadIncrease, \
2977 "Additional size added to desired new generation size per " \
2978 "non-daemon thread (in bytes)") \
2979 \
2980 product_pd(uintx, PermSize, \
2981 "Initial size of permanent generation (in bytes)") \
2982 \
2983 product_pd(uintx, MaxPermSize, \
2984 "Maximum size of permanent generation (in bytes)") \
2985 \
2986 product(uintx, MinHeapFreeRatio, 40, \
2987 "Min percentage of heap free after GC to avoid expansion") \
2988 \
2989 product(uintx, MaxHeapFreeRatio, 70, \
2990 "Max percentage of heap free after GC to avoid shrinking") \
2991 \
2992 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
2993 "Number of milliseconds per MB of free space in the heap") \
2994 \
2995 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
2996 "Min change in heap space due to GC (in bytes)") \
2997 \
2998 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
2999 "Min expansion of permanent heap (in bytes)") \
3000 \
3001 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3002 "Max expansion of permanent heap without full GC (in bytes)") \
3003 \
3004 product(intx, QueuedAllocationWarningCount, 0, \
3005 "Number of times an allocation that queues behind a GC " \
3006 "will retry before printing a warning") \
3007 \
3008 diagnostic(uintx, VerifyGCStartAt, 0, \
3009 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3010 \
3011 diagnostic(intx, VerifyGCLevel, 0, \
3012 "Generation level at which to start +VerifyBefore/AfterGC") \
3013 \
3014 develop(uintx, ExitAfterGCNum, 0, \
3015 "If non-zero, exit after this GC.") \
3016 \
3017 product(intx, MaxTenuringThreshold, 15, \
3018 "Maximum value for tenuring threshold") \
3019 \
3020 product(intx, InitialTenuringThreshold, 7, \
3021 "Initial value for tenuring threshold") \
3022 \
3023 product(intx, TargetSurvivorRatio, 50, \
3024 "Desired percentage of survivor space used after scavenge") \
3025 \
3026 product(uintx, MarkSweepDeadRatio, 5, \
3027 "Percentage (0-100) of the old gen allowed as dead wood." \
3028 "Serial mark sweep treats this as both the min and max value." \
3029 "CMS uses this value only if it falls back to mark sweep." \
3030 "Par compact uses a variable scale based on the density of the" \
3031 "generation and treats this as the max value when the heap is" \
3032 "either completely full or completely empty. Par compact also" \
3033 "has a smaller default value; see arguments.cpp.") \
3034 \
3035 product(uintx, PermMarkSweepDeadRatio, 20, \
3036 "Percentage (0-100) of the perm gen allowed as dead wood." \
3037 "See MarkSweepDeadRatio for collector-specific comments.") \
3038 \
3039 product(intx, MarkSweepAlwaysCompactCount, 4, \
3040 "How often should we fully compact the heap (ignoring the dead " \
3041 "space parameters)") \
3042 \
3043 product(intx, PrintCMSStatistics, 0, \
3044 "Statistics for CMS") \
3045 \
3046 product(bool, PrintCMSInitiationStatistics, false, \
3047 "Statistics for initiating a CMS collection") \
3048 \
3049 product(intx, PrintFLSStatistics, 0, \
3050 "Statistics for CMS' FreeListSpace") \
3051 \
3052 product(intx, PrintFLSCensus, 0, \
3053 "Census for CMS' FreeListSpace") \
3054 \
3055 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3056 "Delay in ms between expansion and allocation") \
3057 \
3058 product(intx, DeferThrSuspendLoopCount, 4000, \
3059 "(Unstable) Number of times to iterate in safepoint loop " \
3060 " before blocking VM threads ") \
3061 \
3062 product(intx, DeferPollingPageLoopCount, -1, \
3063 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3064 "before changing safepoint polling page to RO ") \
3065 \
3066 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3067 \
3068 product(bool, UseDepthFirstScavengeOrder, true, \
3069 "true: the scavenge order will be depth-first, " \
3070 "false: the scavenge order will be breadth-first") \
3071 \
3072 product(bool, PSChunkLargeArrays, true, \
3073 "true: process large arrays in chunks") \
3074 \
3075 product(uintx, GCDrainStackTargetSize, 64, \
3076 "how many entries we'll try to leave on the stack during " \
3077 "parallel GC") \
3078 \
3079 /* stack parameters */ \
3080 product_pd(intx, StackYellowPages, \
3081 "Number of yellow zone (recoverable overflows) pages") \
3082 \
3083 product_pd(intx, StackRedPages, \
3084 "Number of red zone (unrecoverable overflows) pages") \
3085 \
3086 product_pd(intx, StackShadowPages, \
3087 "Number of shadow zone (for overflow checking) pages" \
3088 " this should exceed the depth of the VM and native call stack") \
3089 \
3090 product_pd(intx, ThreadStackSize, \
3091 "Thread Stack Size (in Kbytes)") \
3092 \
3093 product_pd(intx, VMThreadStackSize, \
3094 "Non-Java Thread Stack Size (in Kbytes)") \
3095 \
3096 product_pd(intx, CompilerThreadStackSize, \
3097 "Compiler Thread Stack Size (in Kbytes)") \
3098 \
3099 develop_pd(uintx, JVMInvokeMethodSlack, \
3100 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3101 \
3102 product(uintx, ThreadSafetyMargin, 50*M, \
3103 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3104 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3105 "disable this feature") \
3106 \
3107 /* code cache parameters */ \
3108 develop(uintx, CodeCacheSegmentSize, 64, \
3109 "Code cache segment size (in bytes) - smallest unit of " \
3110 "allocation") \
3111 \
3112 develop_pd(intx, CodeEntryAlignment, \
3113 "Code entry alignment for generated code (in bytes)") \
3114 \
3115 product_pd(intx, OptoLoopAlignment, \
3116 "Align inner loops to zero relative to this modulus") \
3117 \
3118 product_pd(uintx, InitialCodeCacheSize, \
3119 "Initial code cache size (in bytes)") \
3120 \
3121 product_pd(uintx, ReservedCodeCacheSize, \
3122 "Reserved code cache size (in bytes) - maximum code cache size") \
3123 \
3124 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3125 "When less than X space left, we stop compiling.") \
3126 \
3127 product_pd(uintx, CodeCacheExpansionSize, \
3128 "Code cache expansion size (in bytes)") \
3129 \
3130 develop_pd(uintx, CodeCacheMinBlockLength, \
3131 "Minimum number of segments in a code cache block.") \
3132 \
3133 notproduct(bool, ExitOnFullCodeCache, false, \
3134 "Exit the VM if we fill the code cache.") \
3135 \
3136 product(bool, UseCodeCacheFlushing, false, \
3137 "Attempt to clean the code cache before shutting off compiler") \
3138 \
3139 product(intx, MinCodeCacheFlushingInterval, 30, \
3140 "Min number of seconds between code cache cleaning sessions") \
3141 \
3142 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3143 "When less than X space left, start code cache cleaning") \
3144 \
3145 /* interpreter debugging */ \
3146 develop(intx, BinarySwitchThreshold, 5, \
3147 "Minimal number of lookupswitch entries for rewriting to binary " \
3148 "switch") \
3149 \
3150 develop(intx, StopInterpreterAt, 0, \
3151 "Stops interpreter execution at specified bytecode number") \
3152 \
3153 develop(intx, TraceBytecodesAt, 0, \
3154 "Traces bytecodes starting with specified bytecode number") \
3155 \
3156 /* compiler interface */ \
3157 develop(intx, CIStart, 0, \
3158 "the id of the first compilation to permit") \
3159 \
3160 develop(intx, CIStop, -1, \
3161 "the id of the last compilation to permit") \
3162 \
3163 develop(intx, CIStartOSR, 0, \
3164 "the id of the first osr compilation to permit " \
3165 "(CICountOSR must be on)") \
3166 \
3167 develop(intx, CIStopOSR, -1, \
3168 "the id of the last osr compilation to permit " \
3169 "(CICountOSR must be on)") \
3170 \
3171 develop(intx, CIBreakAtOSR, -1, \
3172 "id of osr compilation to break at") \
3173 \
3174 develop(intx, CIBreakAt, -1, \
3175 "id of compilation to break at") \
3176 \
3177 product(ccstrlist, CompileOnly, "", \
3178 "List of methods (pkg/class.name) to restrict compilation to") \
3179 \
3180 product(ccstr, CompileCommandFile, NULL, \
3181 "Read compiler commands from this file [.hotspot_compiler]") \
3182 \
3183 product(ccstrlist, CompileCommand, "", \
3184 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3185 \
3186 product(bool, CICompilerCountPerCPU, false, \
3187 "1 compiler thread for log(N CPUs)") \
3188 \
3189 develop(intx, CIFireOOMAt, -1, \
3190 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3191 "(non-negative value throws OOM after this many CI accesses " \
3192 "in each compile)") \
3193 \
3194 develop(intx, CIFireOOMAtDelay, -1, \
3195 "Wait for this many CI accesses to occur in all compiles before " \
3196 "beginning to throw OutOfMemoryErrors in each compile") \
3197 \
3198 notproduct(bool, CIObjectFactoryVerify, false, \
3199 "enable potentially expensive verification in ciObjectFactory") \
3200 \
3201 /* Priorities */ \
3202 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3203 \
3204 product(intx, ThreadPriorityPolicy, 0, \
3205 "0 : Normal. "\
3206 " VM chooses priorities that are appropriate for normal "\
3207 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3208 " to normal native priority. Java priorities below NORM_PRIORITY"\
3209 " map to lower native priority values. On Windows applications"\
3210 " are allowed to use higher native priorities. However, with "\
3211 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3212 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3213 " interfere with system threads. On Linux thread priorities "\
3214 " are ignored because the OS does not support static priority "\
3215 " in SCHED_OTHER scheduling class which is the only choice for"\
3216 " non-root, non-realtime applications. "\
3217 "1 : Aggressive. "\
3218 " Java thread priorities map over to the entire range of "\
3219 " native thread priorities. Higher Java thread priorities map "\
3220 " to higher native thread priorities. This policy should be "\
3221 " used with care, as sometimes it can cause performance "\
3222 " degradation in the application and/or the entire system. On "\
3223 " Linux this policy requires root privilege.") \
3224 \
3225 product(bool, ThreadPriorityVerbose, false, \
3226 "print priority changes") \
3227 \
3228 product(intx, DefaultThreadPriority, -1, \
3229 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3230 \
3231 product(intx, CompilerThreadPriority, -1, \
3232 "what priority should compiler threads run at (-1 means no change)") \
3233 \
3234 product(intx, VMThreadPriority, -1, \
3235 "what priority should VM threads run at (-1 means no change)") \
3236 \
3237 product(bool, CompilerThreadHintNoPreempt, true, \
3238 "(Solaris only) Give compiler threads an extra quanta") \
3239 \
3240 product(bool, VMThreadHintNoPreempt, false, \
3241 "(Solaris only) Give VM thread an extra quanta") \
3242 \
3243 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3244 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3245 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3246 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3247 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3248 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3249 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3250 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3251 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3252 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3253 \
3254 /* compiler debugging */ \
3255 notproduct(intx, CompileTheWorldStartAt, 1, \
3256 "First class to consider when using +CompileTheWorld") \
3257 \
3258 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3259 "Last class to consider when using +CompileTheWorld") \
3260 \
3261 develop(intx, NewCodeParameter, 0, \
3262 "Testing Only: Create a dedicated integer parameter before " \
3263 "putback") \
3264 \
3265 /* new oopmap storage allocation */ \
3266 develop(intx, MinOopMapAllocation, 8, \
3267 "Minimum number of OopMap entries in an OopMapSet") \
3268 \
3269 /* Background Compilation */ \
3270 develop(intx, LongCompileThreshold, 50, \
3271 "Used with +TraceLongCompiles") \
3272 \
3273 product(intx, StarvationMonitorInterval, 200, \
3274 "Pause between each check in ms") \
3275 \
3276 /* recompilation */ \
3277 product_pd(intx, CompileThreshold, \
3278 "number of interpreted method invocations before (re-)compiling") \
3279 \
3280 product_pd(intx, BackEdgeThreshold, \
3281 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3282 \
3283 product(intx, Tier1BytecodeLimit, 10, \
3284 "Must have at least this many bytecodes before tier1" \
3285 "invocation counters are used") \
3286 \
3287 product_pd(intx, Tier2CompileThreshold, \
3288 "threshold at which a tier 2 compilation is invoked") \
3289 \
3290 product_pd(intx, Tier2BackEdgeThreshold, \
3291 "Back edge threshold at which a tier 2 compilation is invoked") \
3292 \
3293 product_pd(intx, Tier3CompileThreshold, \
3294 "threshold at which a tier 3 compilation is invoked") \
3295 \
3296 product_pd(intx, Tier3BackEdgeThreshold, \
3297 "Back edge threshold at which a tier 3 compilation is invoked") \
3298 \
3299 product_pd(intx, Tier4CompileThreshold, \
3300 "threshold at which a tier 4 compilation is invoked") \
3301 \
3302 product_pd(intx, Tier4BackEdgeThreshold, \
3303 "Back edge threshold at which a tier 4 compilation is invoked") \
3304 \
3305 product_pd(bool, TieredCompilation, \
3306 "Enable two-tier compilation") \
3307 \
3308 product(bool, StressTieredRuntime, false, \
3309 "Alternate client and server compiler on compile requests") \
3310 \
3311 product_pd(intx, OnStackReplacePercentage, \
3312 "NON_TIERED number of method invocations/branches (expressed as %"\
3313 "of CompileThreshold) before (re-)compiling OSR code") \
3314 \
3315 product(intx, InterpreterProfilePercentage, 33, \
3316 "NON_TIERED number of method invocations/branches (expressed as %"\
3317 "of CompileThreshold) before profiling in the interpreter") \
3318 \
3319 develop(intx, MaxRecompilationSearchLength, 10, \
3320 "max. # frames to inspect searching for recompilee") \
3321 \
3322 develop(intx, MaxInterpretedSearchLength, 3, \
3323 "max. # interp. frames to skip when searching for recompilee") \
3324 \
3325 develop(intx, DesiredMethodLimit, 8000, \
3326 "desired max. method size (in bytecodes) after inlining") \
3327 \
3328 develop(intx, HugeMethodLimit, 8000, \
3329 "don't compile methods larger than this if " \
3330 "+DontCompileHugeMethods") \
3331 \
3332 /* New JDK 1.4 reflection implementation */ \
3333 \
3334 develop(bool, UseNewReflection, true, \
3335 "Temporary flag for transition to reflection based on dynamic " \
3336 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3337 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3338 "changes were needed") \
3339 \
3340 develop(bool, VerifyReflectionBytecodes, false, \
3341 "Force verification of 1.4 reflection bytecodes. Does not work " \
3342 "in situations like that described in 4486457 or for " \
3343 "constructors generated for serialization, so can not be enabled "\
3344 "in product.") \
3345 \
3346 product(bool, ReflectionWrapResolutionErrors, true, \
3347 "Temporary flag for transition to AbstractMethodError wrapped " \
3348 "in InvocationTargetException. See 6531596") \
3349 \
3350 \
3351 develop(intx, FastSuperclassLimit, 8, \
3352 "Depth of hardwired instanceof accelerator array") \
3353 \
3354 /* Properties for Java libraries */ \
3355 \
3356 product(intx, MaxDirectMemorySize, -1, \
3357 "Maximum total size of NIO direct-buffer allocations") \
3358 \
3359 /* temporary developer defined flags */ \
3360 \
3361 diagnostic(bool, UseNewCode, false, \
3362 "Testing Only: Use the new version while testing") \
3363 \
3364 diagnostic(bool, UseNewCode2, false, \
3365 "Testing Only: Use the new version while testing") \
3366 \
3367 diagnostic(bool, UseNewCode3, false, \
3368 "Testing Only: Use the new version while testing") \
3369 \
3370 /* flags for performance data collection */ \
3371 \
3372 product(bool, UsePerfData, true, \
3373 "Flag to disable jvmstat instrumentation for performance testing" \
3374 "and problem isolation purposes.") \
3375 \
3376 product(bool, PerfDataSaveToFile, false, \
3377 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3378 \
3379 product(ccstr, PerfDataSaveFile, NULL, \
3380 "Save PerfData memory to the specified absolute pathname," \
3381 "%p in the file name if present will be replaced by pid") \
3382 \
3383 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3384 "Data sampling interval in milliseconds") \
3385 \
3386 develop(bool, PerfTraceDataCreation, false, \
3387 "Trace creation of Performance Data Entries") \
3388 \
3389 develop(bool, PerfTraceMemOps, false, \
3390 "Trace PerfMemory create/attach/detach calls") \
3391 \
3392 product(bool, PerfDisableSharedMem, false, \
3393 "Store performance data in standard memory") \
3394 \
3395 product(intx, PerfDataMemorySize, 32*K, \
3396 "Size of performance data memory region. Will be rounded " \
3397 "up to a multiple of the native os page size.") \
3398 \
3399 product(intx, PerfMaxStringConstLength, 1024, \
3400 "Maximum PerfStringConstant string length before truncation") \
3401 \
3402 product(bool, PerfAllowAtExitRegistration, false, \
3403 "Allow registration of atexit() methods") \
3404 \
3405 product(bool, PerfBypassFileSystemCheck, false, \
3406 "Bypass Win32 file system criteria checks (Windows Only)") \
3407 \
3408 product(intx, UnguardOnExecutionViolation, 0, \
3409 "Unguard page and retry on no-execute fault (Win32 only)" \
3410 "0=off, 1=conservative, 2=aggressive") \
3411 \
3412 /* Serviceability Support */ \
3413 \
3414 product(bool, ManagementServer, false, \
3415 "Create JMX Management Server") \
3416 \
3417 product(bool, DisableAttachMechanism, false, \
3418 "Disable mechanism that allows tools to attach to this VM") \
3419 \
3420 product(bool, StartAttachListener, false, \
3421 "Always start Attach Listener at VM startup") \
3422 \
3423 manageable(bool, PrintConcurrentLocks, false, \
3424 "Print java.util.concurrent locks in thread dump") \
3425 \
3426 /* Shared spaces */ \
3427 \
3428 product(bool, UseSharedSpaces, true, \
3429 "Use shared spaces in the permanent generation") \
3430 \
3431 product(bool, RequireSharedSpaces, false, \
3432 "Require shared spaces in the permanent generation") \
3433 \
3434 product(bool, ForceSharedSpaces, false, \
3435 "Require shared spaces in the permanent generation") \
3436 \
3437 product(bool, DumpSharedSpaces, false, \
3438 "Special mode: JVM reads a class list, loads classes, builds " \
3439 "shared spaces, and dumps the shared spaces to a file to be " \
3440 "used in future JVM runs.") \
3441 \
3442 product(bool, PrintSharedSpaces, false, \
3443 "Print usage of shared spaces") \
3444 \
3445 product(uintx, SharedDummyBlockSize, 512*M, \
3446 "Size of dummy block used to shift heap addresses (in bytes)") \
3447 \
3448 product(uintx, SharedReadWriteSize, 12*M, \
3449 "Size of read-write space in permanent generation (in bytes)") \
3450 \
3451 product(uintx, SharedReadOnlySize, 10*M, \
3452 "Size of read-only space in permanent generation (in bytes)") \
3453 \
3454 product(uintx, SharedMiscDataSize, 4*M, \
3455 "Size of the shared data area adjacent to the heap (in bytes)") \
3456 \
3457 product(uintx, SharedMiscCodeSize, 4*M, \
3458 "Size of the shared code area adjacent to the heap (in bytes)") \
3459 \
3460 diagnostic(bool, SharedOptimizeColdStart, true, \
3461 "At dump time, order shared objects to achieve better " \
3462 "cold startup time.") \
3463 \
3464 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3465 "Reordering policy for SharedOptimizeColdStart " \
3466 "0=favor classload-time locality, 1=balanced, " \
3467 "2=favor runtime locality") \
3468 \
3469 diagnostic(bool, SharedSkipVerify, false, \
3470 "Skip assert() and verify() which page-in unwanted shared " \
3471 "objects. ") \
3472 \
3473 product(bool, AnonymousClasses, false, \
3474 "support sun.misc.Unsafe.defineAnonymousClass") \
3475 \
3476 experimental(bool, EnableMethodHandles, false, \
3477 "support method handles (true by default under JSR 292)") \
3478 \
3479 diagnostic(intx, MethodHandlePushLimit, 3, \
3480 "number of additional stack slots a method handle may push") \
3481 \
3482 develop(bool, TraceMethodHandles, false, \
3483 "trace internal method handle operations") \
3484 \
3485 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3486 "perform extra checks when constructing method handles") \
3487 \
3488 diagnostic(bool, OptimizeMethodHandles, true, \
3489 "when constructing method handles, try to improve them") \
3490 \
3491 experimental(bool, TrustFinalNonStaticFields, false, \
3492 "trust final non-static declarations for constant folding") \
3493 \
3494 experimental(bool, EnableInvokeDynamic, false, \
3495 "recognize the invokedynamic instruction") \
3496 \
3497 develop(bool, TraceInvokeDynamic, false, \
3498 "trace internal invoke dynamic operations") \
3499 \
3500 product(bool, TaggedStackInterpreter, false, \
3501 "Insert tags in interpreter execution stack for oopmap generaion")\
3502 \
3503 diagnostic(bool, PauseAtStartup, false, \
3504 "Causes the VM to pause at startup time and wait for the pause " \
3505 "file to be removed (default: ./vm.paused.<pid>)") \
3506 \
3507 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3508 "The file to create and for whose removal to await when pausing " \
3509 "at startup. (default: ./vm.paused.<pid>)") \
3510 \
3511 product(bool, ExtendedDTraceProbes, false, \
3512 "Enable performance-impacting dtrace probes") \
3513 \
3514 product(bool, DTraceMethodProbes, false, \
3515 "Enable dtrace probes for method-entry and method-exit") \
3516 \
3517 product(bool, DTraceAllocProbes, false, \
3518 "Enable dtrace probes for object allocation") \
3519 \
3520 product(bool, DTraceMonitorProbes, false, \
3521 "Enable dtrace probes for monitor events") \
3522 \
3523 product(bool, RelaxAccessControlCheck, false, \
3524 "Relax the access control checks in the verifier") \
3525 \
3526 diagnostic(bool, PrintDTraceDOF, false, \
3527 "Print the DTrace DOF passed to the system for JSDT probes") \
3528 \
3529 product(bool, UseVMInterruptibleIO, false, \
3530 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3531 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3532 " of this flag is true for JDK 6 and earliers")
3533
3534
3535 /*
3536 * Macros for factoring of globals
3537 */
3538
3539 // Interface macros
3540 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3541 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3542 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3543 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3544 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3545 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3546 #ifdef PRODUCT
3547 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3548 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3549 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3550 #else
3551 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3552 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3553 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3554 #endif
3555 // Special LP64 flags, product only needed for now.
3556 #ifdef _LP64
3557 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3558 #else
3559 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3560 #endif // _LP64
3561
3562 // Implementation macros
3563 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3564 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3565 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3566 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3567 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3568 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3569 #ifdef PRODUCT
3570 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3571 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3572 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3573 #else
3574 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3575 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3576 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3577 #endif
3578 #ifdef _LP64
3579 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3580 #else
3581 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3582 #endif // _LP64
3583
3584 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)
3585
3586 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)