1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
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, BackEdgeThreshold, 0);
39
40 define_pd_global(intx, OnStackReplacePercentage, 0);
41 define_pd_global(bool, ResizeTLAB, false);
42 define_pd_global(intx, FreqInlineSize, 0);
43 define_pd_global(intx, InlineSmallCode, 0);
44 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
45 define_pd_global(intx, InlineClassNatives, true);
46 define_pd_global(intx, InlineUnsafeOps, true);
47 define_pd_global(intx, InitialCodeCacheSize, 160*K);
48 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
49 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
50 define_pd_global(intx, CodeCacheMinBlockLength, 1);
51 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
52 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
53 define_pd_global(bool, NeverActAsServerClassMachine, true);
54 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
55 #define CI_COMPILER_COUNT 0
56 #else
57
58 #ifdef COMPILER2
59 #define CI_COMPILER_COUNT 2
60 #else
61 #define CI_COMPILER_COUNT 1
62 #endif // COMPILER2
63
64 #endif // no compilers
65
66
67 // string type aliases used only in this file
68 typedef const char* ccstr;
69 typedef const char* ccstrlist; // represents string arguments which accumulate
70
71 enum FlagValueOrigin {
72 DEFAULT = 0,
73 COMMAND_LINE = 1,
74 ENVIRON_VAR = 2,
75 CONFIG_FILE = 3,
76 MANAGEMENT = 4,
77 ERGONOMIC = 5,
78 ATTACH_ON_DEMAND = 6,
79 INTERNAL = 99
80 };
81
82 struct Flag {
83 const char *type;
84 const char *name;
85 void* addr;
86
87 NOT_PRODUCT(const char *doc;)
88
89 const char *kind;
90 FlagValueOrigin origin;
91
92 // points to all Flags static array
93 static Flag *flags;
94
95 // number of flags
96 static size_t numFlags;
97
98 static Flag* find_flag(char* name, size_t length);
99
100 bool is_bool() const { return strcmp(type, "bool") == 0; }
101 bool get_bool() const { return *((bool*) addr); }
102 void set_bool(bool value) { *((bool*) addr) = value; }
103
104 bool is_intx() const { return strcmp(type, "intx") == 0; }
105 intx get_intx() const { return *((intx*) addr); }
106 void set_intx(intx value) { *((intx*) addr) = value; }
107
108 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
109 uintx get_uintx() const { return *((uintx*) addr); }
110 void set_uintx(uintx value) { *((uintx*) addr) = value; }
111
112 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
113 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
114 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
115
116 bool is_double() const { return strcmp(type, "double") == 0; }
117 double get_double() const { return *((double*) addr); }
118 void set_double(double value) { *((double*) addr) = value; }
119
120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
122 ccstr get_ccstr() const { return *((ccstr*) addr); }
123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
124
125 bool is_unlocker() const;
126 bool is_unlocked() const;
127 bool is_writeable() const;
128 bool is_external() const;
129
130 void print_on(outputStream* st, bool withComments = false );
131 void print_as_flag(outputStream* st);
132 };
133
134 // debug flags control various aspects of the VM and are global accessible
135
136 // use FlagSetting to temporarily change some debug flag
137 // e.g. FlagSetting fs(DebugThisAndThat, true);
138 // restored to previous value upon leaving scope
139 class FlagSetting {
140 bool val;
141 bool* flag;
142 public:
143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
144 ~FlagSetting() { *flag = val; }
145 };
146
147
148 class CounterSetting {
149 intx* counter;
150 public:
151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
152 ~CounterSetting() { (*counter)--; }
153 };
154
155
156 class IntFlagSetting {
157 intx val;
158 intx* flag;
159 public:
160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
161 ~IntFlagSetting() { *flag = val; }
162 };
163
164
165 class DoubleFlagSetting {
166 double val;
167 double* flag;
168 public:
169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
170 ~DoubleFlagSetting() { *flag = val; }
171 };
172
173
174 class CommandLineFlags {
175 public:
176 static bool boolAt(char* name, size_t len, bool* value);
177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
180
181 static bool intxAt(char* name, size_t len, intx* value);
182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
185
186 static bool uintxAt(char* name, size_t len, uintx* value);
187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
190
191 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
192 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
193 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
194 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
195
196 static bool doubleAt(char* name, size_t len, double* value);
197 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
198 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
199 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
200
201 static bool ccstrAt(char* name, size_t len, ccstr* value);
202 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
203 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
204 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
205
206 // Returns false if name is not a command line flag.
207 static bool wasSetOnCmdline(const char* name, bool* value);
208 static void printSetFlags();
209
210 static void printFlags(bool withComments = false );
211
212 static void verify() PRODUCT_RETURN;
213 };
214
215 // use this for flags that are true by default in the debug version but
216 // false in the optimized version, and vice versa
217 #ifdef ASSERT
218 #define trueInDebug true
219 #define falseInDebug false
220 #else
221 #define trueInDebug false
222 #define falseInDebug true
223 #endif
224
225 // use this for flags that are true per default in the product build
226 // but false in development builds, and vice versa
227 #ifdef PRODUCT
228 #define trueInProduct true
229 #define falseInProduct false
230 #else
231 #define trueInProduct false
232 #define falseInProduct true
233 #endif
234
235 // use this for flags that are true per default in the tiered build
236 // but false in non-tiered builds, and vice versa
237 #ifdef TIERED
238 #define trueInTiered true
239 #define falseInTiered false
240 #else
241 #define trueInTiered false
242 #define falseInTiered true
243 #endif
244
245 // develop flags are settable / visible only during development and are constant in the PRODUCT version
246 // product flags are always settable / visible
247 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
248
249 // A flag must be declared with one of the following types:
250 // bool, intx, uintx, ccstr.
251 // The type "ccstr" is an alias for "const char*" and is used
252 // only in this file, because the macrology requires single-token type names.
253
254 // Note: Diagnostic options not meant for VM tuning or for product modes.
255 // They are to be used for VM quality assurance or field diagnosis
256 // of VM bugs. They are hidden so that users will not be encouraged to
257 // try them as if they were VM ordinary execution options. However, they
258 // are available in the product version of the VM. Under instruction
259 // from support engineers, VM customers can turn them on to collect
260 // diagnostic information about VM problems. To use a VM diagnostic
261 // option, you must first specify +UnlockDiagnosticVMOptions.
262 // (This master switch also affects the behavior of -Xprintflags.)
263 //
264 // experimental flags are in support of features that are not
265 // part of the officially supported product, but are available
266 // for experimenting with. They could, for example, be performance
267 // features that may not have undergone full or rigorous QA, but which may
268 // help performance in some cases and released for experimentation
269 // by the community of users and developers. This flag also allows one to
270 // be able to build a fully supported product that nonetheless also
271 // ships with some unsupported, lightly tested, experimental features.
272 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
273 // UnlockExperimentalVMOptions flag, which allows the control and
274 // modification of the experimental flags.
275 //
276 // Nota bene: neither diagnostic nor experimental options should be used casually,
277 // and they are not supported on production loads, except under explicit
278 // direction from support engineers.
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 lp64_product(intx, ObjectAlignmentInBytes, 8, \
325 "Default object alignment in bytes, 8 is minimum") \
326 \
327 /* UseMembar is theoretically a temp flag used for memory barrier \
328 * removal testing. It was supposed to be removed before FCS but has \
329 * been re-added (see 6401008) */ \
330 product_pd(bool, UseMembar, \
331 "(Unstable) Issues membars on thread state transitions") \
332 \
333 /* Temporary: See 6948537 */ \
334 experimental(bool, UseMemSetInBOT, true, \
335 "(Unstable) uses memset in BOT updates in GC code") \
336 \
337 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
338 "Enable normal processing of flags relating to field diagnostics")\
339 \
340 experimental(bool, UnlockExperimentalVMOptions, false, \
341 "Enable normal processing of flags relating to experimental features")\
342 \
343 product(bool, JavaMonitorsInStackTrace, true, \
344 "Print info. about Java monitor locks when the stacks are dumped")\
345 \
346 product_pd(bool, UseLargePages, \
347 "Use large page memory") \
348 \
349 product_pd(bool, UseLargePagesIndividualAllocation, \
350 "Allocate large pages individually for better affinity") \
351 \
352 develop(bool, LargePagesIndividualAllocationInjectError, false, \
353 "Fail large pages individual allocation") \
354 \
355 develop(bool, TracePageSizes, false, \
356 "Trace page size selection and usage.") \
357 \
358 product(bool, UseNUMA, false, \
359 "Use NUMA if available") \
360 \
361 product(bool, ForceNUMA, false, \
362 "Force NUMA optimizations on single-node/UMA systems") \
363 \
364 product(intx, NUMAChunkResizeWeight, 20, \
365 "Percentage (0-100) used to weight the current sample when " \
366 "computing exponentially decaying average for " \
367 "AdaptiveNUMAChunkSizing") \
368 \
369 product(intx, NUMASpaceResizeRate, 1*G, \
370 "Do not reallocate more that this amount per collection") \
371 \
372 product(bool, UseAdaptiveNUMAChunkSizing, true, \
373 "Enable adaptive chunk sizing for NUMA") \
374 \
375 product(bool, NUMAStats, false, \
376 "Print NUMA stats in detailed heap information") \
377 \
378 product(intx, NUMAPageScanRate, 256, \
379 "Maximum number of pages to include in the page scan procedure") \
380 \
381 product_pd(bool, NeedsDeoptSuspend, \
382 "True for register window machines (sparc/ia64)") \
383 \
384 product(intx, UseSSE, 99, \
385 "Highest supported SSE instructions set on x86/x64") \
386 \
387 product(uintx, LargePageSizeInBytes, 0, \
388 "Large page size (0 to let VM choose the page size") \
389 \
390 product(uintx, LargePageHeapSizeThreshold, 128*M, \
391 "Use large pages if max heap is at least this big") \
392 \
393 product(bool, ForceTimeHighResolution, false, \
394 "Using high time resolution(For Win32 only)") \
395 \
396 develop(bool, TraceItables, false, \
397 "Trace initialization and use of itables") \
398 \
399 develop(bool, TracePcPatching, false, \
400 "Trace usage of frame::patch_pc") \
401 \
402 develop(bool, TraceJumps, false, \
403 "Trace assembly jumps in thread ring buffer") \
404 \
405 develop(bool, TraceRelocator, false, \
406 "Trace the bytecode relocator") \
407 \
408 develop(bool, TraceLongCompiles, false, \
409 "Print out every time compilation is longer than " \
410 "a given threashold") \
411 \
412 develop(bool, SafepointALot, false, \
413 "Generates a lot of safepoints. Works with " \
414 "GuaranteedSafepointInterval") \
415 \
416 product_pd(bool, BackgroundCompilation, \
417 "A thread requesting compilation is not blocked during " \
418 "compilation") \
419 \
420 product(bool, PrintVMQWaitTime, false, \
421 "Prints out the waiting time in VM operation queue") \
422 \
423 develop(bool, BailoutToInterpreterForThrows, false, \
424 "Compiled methods which throws/catches exceptions will be " \
425 "deopt and intp.") \
426 \
427 develop(bool, NoYieldsInMicrolock, false, \
428 "Disable yields in microlock") \
429 \
430 develop(bool, TraceOopMapGeneration, false, \
431 "Shows oopmap generation") \
432 \
433 product(bool, MethodFlushing, true, \
434 "Reclamation of zombie and not-entrant methods") \
435 \
436 develop(bool, VerifyStack, false, \
437 "Verify stack of each thread when it is entering a runtime call") \
438 \
439 develop(bool, ForceUnreachable, false, \
440 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
441 \
442 notproduct(bool, StressDerivedPointers, false, \
443 "Force scavenge when a derived pointers is detected on stack " \
444 "after rtm call") \
445 \
446 develop(bool, TraceDerivedPointers, false, \
447 "Trace traversal of derived pointers on stack") \
448 \
449 notproduct(bool, TraceCodeBlobStacks, false, \
450 "Trace stack-walk of codeblobs") \
451 \
452 product(bool, PrintJNIResolving, false, \
453 "Used to implement -v:jni") \
454 \
455 notproduct(bool, PrintRewrites, false, \
456 "Print methods that are being rewritten") \
457 \
458 product(bool, UseInlineCaches, true, \
459 "Use Inline Caches for virtual calls ") \
460 \
461 develop(bool, InlineArrayCopy, true, \
462 "inline arraycopy native that is known to be part of " \
463 "base library DLL") \
464 \
465 develop(bool, InlineObjectHash, true, \
466 "inline Object::hashCode() native that is known to be part " \
467 "of base library DLL") \
468 \
469 develop(bool, InlineObjectCopy, true, \
470 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
471 \
472 develop(bool, InlineNatives, true, \
473 "inline natives that are known to be part of base library DLL") \
474 \
475 develop(bool, InlineMathNatives, true, \
476 "inline SinD, CosD, etc.") \
477 \
478 develop(bool, InlineClassNatives, true, \
479 "inline Class.isInstance, etc") \
480 \
481 develop(bool, InlineAtomicLong, true, \
482 "inline sun.misc.AtomicLong") \
483 \
484 develop(bool, InlineThreadNatives, true, \
485 "inline Thread.currentThread, etc") \
486 \
487 develop(bool, InlineReflectionGetCallerClass, true, \
488 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
489 "of base library DLL") \
490 \
491 develop(bool, InlineUnsafeOps, true, \
492 "inline memory ops (native methods) from sun.misc.Unsafe") \
493 \
494 develop(bool, ConvertCmpD2CmpF, true, \
495 "Convert cmpD to cmpF when one input is constant in float range") \
496 \
497 develop(bool, ConvertFloat2IntClipping, true, \
498 "Convert float2int clipping idiom to integer clipping") \
499 \
500 develop(bool, SpecialStringCompareTo, true, \
501 "special version of string compareTo") \
502 \
503 develop(bool, SpecialStringIndexOf, true, \
504 "special version of string indexOf") \
505 \
506 develop(bool, SpecialStringEquals, true, \
507 "special version of string equals") \
508 \
509 develop(bool, SpecialArraysEquals, true, \
510 "special version of Arrays.equals(char[],char[])") \
511 \
512 product(bool, UseSSE42Intrinsics, false, \
513 "SSE4.2 versions of intrinsics") \
514 \
515 develop(bool, TraceCallFixup, false, \
516 "traces all call fixups") \
517 \
518 develop(bool, DeoptimizeALot, false, \
519 "deoptimize at every exit from the runtime system") \
520 \
521 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
522 "a comma separated list of bcis to deoptimize at") \
523 \
524 product(bool, DeoptimizeRandom, false, \
525 "deoptimize random frames on random exit from the runtime system")\
526 \
527 notproduct(bool, ZombieALot, false, \
528 "creates zombies (non-entrant) at exit from the runt. system") \
529 \
530 notproduct(bool, WalkStackALot, false, \
531 "trace stack (no print) at every exit from the runtime system") \
532 \
533 develop(bool, Debugging, false, \
534 "set when executing debug methods in debug.ccp " \
535 "(to prevent triggering assertions)") \
536 \
537 notproduct(bool, StrictSafepointChecks, trueInDebug, \
538 "Enable strict checks that safepoints cannot happen for threads " \
539 "that used No_Safepoint_Verifier") \
540 \
541 notproduct(bool, VerifyLastFrame, false, \
542 "Verify oops on last frame on entry to VM") \
543 \
544 develop(bool, TraceHandleAllocation, false, \
545 "Prints out warnings when suspicious many handles are allocated") \
546 \
547 product(bool, UseCompilerSafepoints, true, \
548 "Stop at safepoints in compiled code") \
549 \
550 product(bool, UseSplitVerifier, true, \
551 "use split verifier with StackMapTable attributes") \
552 \
553 product(bool, FailOverToOldVerifier, true, \
554 "fail over to old verifier when split verifier fails") \
555 \
556 develop(bool, ShowSafepointMsgs, false, \
557 "Show msg. about safepoint synch.") \
558 \
559 product(bool, SafepointTimeout, false, \
560 "Time out and warn or fail after SafepointTimeoutDelay " \
561 "milliseconds if failed to reach safepoint") \
562 \
563 develop(bool, DieOnSafepointTimeout, false, \
564 "Die upon failure to reach safepoint (see SafepointTimeout)") \
565 \
566 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
567 /* typically, at most a few retries are needed */ \
568 product(intx, SuspendRetryCount, 50, \
569 "Maximum retry count for an external suspend request") \
570 \
571 product(intx, SuspendRetryDelay, 5, \
572 "Milliseconds to delay per retry (* current_retry_count)") \
573 \
574 product(bool, AssertOnSuspendWaitFailure, false, \
575 "Assert/Guarantee on external suspend wait failure") \
576 \
577 product(bool, TraceSuspendWaitFailures, false, \
578 "Trace external suspend wait failures") \
579 \
580 product(bool, MaxFDLimit, true, \
581 "Bump the number of file descriptors to max in solaris.") \
582 \
583 notproduct(bool, LogEvents, trueInDebug, \
584 "Enable Event log") \
585 \
586 product(bool, BytecodeVerificationRemote, true, \
587 "Enables the Java bytecode verifier for remote classes") \
588 \
589 product(bool, BytecodeVerificationLocal, false, \
590 "Enables the Java bytecode verifier for local classes") \
591 \
592 develop(bool, ForceFloatExceptions, trueInDebug, \
593 "Force exceptions on FP stack under/overflow") \
594 \
595 develop(bool, SoftMatchFailure, trueInProduct, \
596 "If the DFA fails to match a node, print a message and bail out") \
597 \
598 develop(bool, VerifyStackAtCalls, false, \
599 "Verify that the stack pointer is unchanged after calls") \
600 \
601 develop(bool, TraceJavaAssertions, false, \
602 "Trace java language assertions") \
603 \
604 notproduct(bool, CheckAssertionStatusDirectives, false, \
605 "temporary - see javaClasses.cpp") \
606 \
607 notproduct(bool, PrintMallocFree, false, \
608 "Trace calls to C heap malloc/free allocation") \
609 \
610 product(bool, PrintOopAddress, false, \
611 "Always print the location of the oop") \
612 \
613 notproduct(bool, VerifyCodeCacheOften, false, \
614 "Verify compiled-code cache often") \
615 \
616 develop(bool, ZapDeadCompiledLocals, false, \
617 "Zap dead locals in compiler frames") \
618 \
619 notproduct(bool, ZapDeadLocalsOld, false, \
620 "Zap dead locals (old version, zaps all frames when " \
621 "entering the VM") \
622 \
623 notproduct(bool, CheckOopishValues, false, \
624 "Warn if value contains oop ( requires ZapDeadLocals)") \
625 \
626 develop(bool, UseMallocOnly, false, \
627 "use only malloc/free for allocation (no resource area/arena)") \
628 \
629 develop(bool, PrintMalloc, false, \
630 "print all malloc/free calls") \
631 \
632 develop(bool, ZapResourceArea, trueInDebug, \
633 "Zap freed resource/arena space with 0xABABABAB") \
634 \
635 notproduct(bool, ZapVMHandleArea, trueInDebug, \
636 "Zap freed VM handle space with 0xBCBCBCBC") \
637 \
638 develop(bool, ZapJNIHandleArea, trueInDebug, \
639 "Zap freed JNI handle space with 0xFEFEFEFE") \
640 \
641 notproduct(bool, ZapStackSegments, trueInDebug, \
642 "Zap allocated/freed Stack segments with 0xFADFADED") \
643 \
644 develop(bool, ZapUnusedHeapArea, trueInDebug, \
645 "Zap unused heap space with 0xBAADBABE") \
646 \
647 develop(bool, TraceZapUnusedHeapArea, false, \
648 "Trace zapping of unused heap space") \
649 \
650 develop(bool, CheckZapUnusedHeapArea, false, \
651 "Check zapping of unused heap space") \
652 \
653 develop(bool, ZapFillerObjects, trueInDebug, \
654 "Zap filler objects with 0xDEAFBABE") \
655 \
656 develop(bool, PrintVMMessages, true, \
657 "Print vm messages on console") \
658 \
659 product(bool, PrintGCApplicationConcurrentTime, false, \
660 "Print the time the application has been running") \
661 \
662 product(bool, PrintGCApplicationStoppedTime, false, \
663 "Print the time the application has been stopped") \
664 \
665 notproduct(uintx, ErrorHandlerTest, 0, \
666 "If > 0, provokes an error after VM initialization; the value" \
667 "determines which error to provoke. See test_error_handler()" \
668 "in debug.cpp.") \
669 \
670 develop(bool, Verbose, false, \
671 "Prints additional debugging information from other modes") \
672 \
673 develop(bool, PrintMiscellaneous, false, \
674 "Prints uncategorized debugging information (requires +Verbose)") \
675 \
676 develop(bool, WizardMode, false, \
677 "Prints much more debugging information") \
678 \
679 product(bool, ShowMessageBoxOnError, false, \
680 "Keep process alive on VM fatal error") \
681 \
682 product_pd(bool, UseOSErrorReporting, \
683 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
684 \
685 product(bool, SuppressFatalErrorMessage, false, \
686 "Do NO Fatal Error report [Avoid deadlock]") \
687 \
688 product(ccstrlist, OnError, "", \
689 "Run user-defined commands on fatal error; see VMError.cpp " \
690 "for examples") \
691 \
692 product(ccstrlist, OnOutOfMemoryError, "", \
693 "Run user-defined commands on first java.lang.OutOfMemoryError") \
694 \
695 manageable(bool, HeapDumpBeforeFullGC, false, \
696 "Dump heap to file before any major stop-world GC") \
697 \
698 manageable(bool, HeapDumpAfterFullGC, false, \
699 "Dump heap to file after any major stop-world GC") \
700 \
701 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
702 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
703 \
704 manageable(ccstr, HeapDumpPath, NULL, \
705 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
706 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
707 "in the working directory)") \
708 \
709 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
710 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
711 "when the heap usage is larger than this") \
712 \
713 develop(uintx, HeapDumpSegmentSize, 1*G, \
714 "Approximate segment size when generating a segmented heap dump") \
715 \
716 develop(bool, BreakAtWarning, false, \
717 "Execute breakpoint upon encountering VM warning") \
718 \
719 product_pd(bool, UseVectoredExceptions, \
720 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
721 \
722 develop(bool, TraceVMOperation, false, \
723 "Trace vm operations") \
724 \
725 develop(bool, UseFakeTimers, false, \
726 "Tells whether the VM should use system time or a fake timer") \
727 \
728 diagnostic(bool, LogCompilation, false, \
729 "Log compilation activity in detail to hotspot.log or LogFile") \
730 \
731 product(bool, PrintCompilation, false, \
732 "Print compilations") \
733 \
734 diagnostic(bool, TraceNMethodInstalls, false, \
735 "Trace nmethod intallation") \
736 \
737 diagnostic(intx, ScavengeRootsInCode, 0, \
738 "0: do not allow scavengable oops in the code cache; " \
739 "1: allow scavenging from the code cache; " \
740 "2: emit as many constants as the compiler can see") \
741 \
742 diagnostic(bool, TraceOSRBreakpoint, false, \
743 "Trace OSR Breakpoint ") \
744 \
745 diagnostic(bool, TraceCompileTriggered, false, \
746 "Trace compile triggered") \
747 \
748 diagnostic(bool, TraceTriggers, false, \
749 "Trace triggers") \
750 \
751 product(bool, AlwaysRestoreFPU, false, \
752 "Restore the FPU control word after every JNI call (expensive)") \
753 \
754 notproduct(bool, PrintCompilation2, false, \
755 "Print additional statistics per compilation") \
756 \
757 diagnostic(bool, PrintAdapterHandlers, false, \
758 "Print code generated for i2c/c2i adapters") \
759 \
760 develop(bool, VerifyAdapterSharing, false, \
761 "Verify that the code for shared adapters is the equivalent") \
762 \
763 diagnostic(bool, PrintAssembly, false, \
764 "Print assembly code (using external disassembler.so)") \
765 \
766 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
767 "Options string passed to disassembler.so") \
768 \
769 diagnostic(bool, PrintNMethods, false, \
770 "Print assembly code for nmethods when generated") \
771 \
772 diagnostic(bool, PrintNativeNMethods, false, \
773 "Print assembly code for native nmethods when generated") \
774 \
775 develop(bool, PrintDebugInfo, false, \
776 "Print debug information for all nmethods when generated") \
777 \
778 develop(bool, PrintRelocations, false, \
779 "Print relocation information for all nmethods when generated") \
780 \
781 develop(bool, PrintDependencies, false, \
782 "Print dependency information for all nmethods when generated") \
783 \
784 develop(bool, PrintExceptionHandlers, false, \
785 "Print exception handler tables for all nmethods when generated") \
786 \
787 develop(bool, InterceptOSException, false, \
788 "Starts debugger when an implicit OS (e.g., NULL) " \
789 "exception happens") \
790 \
791 notproduct(bool, PrintCodeCache, false, \
792 "Print the compiled_code cache when exiting") \
793 \
794 develop(bool, PrintCodeCache2, false, \
795 "Print detailed info on the compiled_code cache when exiting") \
796 \
797 diagnostic(bool, PrintStubCode, false, \
798 "Print generated stub code") \
799 \
800 product(bool, StackTraceInThrowable, true, \
801 "Collect backtrace in throwable when exception happens") \
802 \
803 product(bool, OmitStackTraceInFastThrow, true, \
804 "Omit backtraces for some 'hot' exceptions in optimized code") \
805 \
806 product(bool, ProfilerPrintByteCodeStatistics, false, \
807 "Prints byte code statictics when dumping profiler output") \
808 \
809 product(bool, ProfilerRecordPC, false, \
810 "Collects tick for each 16 byte interval of compiled code") \
811 \
812 product(bool, ProfileVM, false, \
813 "Profiles ticks that fall within VM (either in the VM Thread " \
814 "or VM code called through stubs)") \
815 \
816 product(bool, ProfileIntervals, false, \
817 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
818 \
819 notproduct(bool, ProfilerCheckIntervals, false, \
820 "Collect and print info on spacing of profiler ticks") \
821 \
822 develop(bool, PrintJVMWarnings, false, \
823 "Prints warnings for unimplemented JVM functions") \
824 \
825 product(bool, PrintWarnings, true, \
826 "Prints JVM warnings to output stream") \
827 \
828 notproduct(uintx, WarnOnStalledSpinLock, 0, \
829 "Prints warnings for stalled SpinLocks") \
830 \
831 develop(bool, InitializeJavaLangSystem, true, \
832 "Initialize java.lang.System - turn off for individual " \
833 "method debugging") \
834 \
835 develop(bool, InitializeJavaLangString, true, \
836 "Initialize java.lang.String - turn off for individual " \
837 "method debugging") \
838 \
839 develop(bool, InitializeJavaLangExceptionsErrors, true, \
840 "Initialize various error and exception classes - turn off for " \
841 "individual method debugging") \
842 \
843 product(bool, RegisterFinalizersAtInit, true, \
844 "Register finalizable objects at end of Object.<init> or " \
845 "after allocation") \
846 \
847 develop(bool, RegisterReferences, true, \
848 "Tells whether the VM should register soft/weak/final/phantom " \
849 "references") \
850 \
851 develop(bool, IgnoreRewrites, false, \
852 "Supress rewrites of bytecodes in the oopmap generator. " \
853 "This is unsafe!") \
854 \
855 develop(bool, PrintCodeCacheExtension, false, \
856 "Print extension of code cache") \
857 \
858 develop(bool, UsePrivilegedStack, true, \
859 "Enable the security JVM functions") \
860 \
861 develop(bool, IEEEPrecision, true, \
862 "Enables IEEE precision (for INTEL only)") \
863 \
864 develop(bool, ProtectionDomainVerification, true, \
865 "Verifies protection domain before resolution in system " \
866 "dictionary") \
867 \
868 product(bool, ClassUnloading, true, \
869 "Do unloading of classes") \
870 \
871 diagnostic(bool, LinkWellKnownClasses, false, \
872 "Resolve a well known class as soon as its name is seen") \
873 \
874 develop(bool, DisableStartThread, false, \
875 "Disable starting of additional Java threads " \
876 "(for debugging only)") \
877 \
878 develop(bool, MemProfiling, false, \
879 "Write memory usage profiling to log file") \
880 \
881 notproduct(bool, PrintSystemDictionaryAtExit, false, \
882 "Prints the system dictionary at exit") \
883 \
884 diagnostic(bool, UnsyncloadClass, false, \
885 "Unstable: VM calls loadClass unsynchronized. Custom " \
886 "class loader must call VM synchronized for findClass " \
887 "and defineClass.") \
888 \
889 product(bool, AlwaysLockClassLoader, false, \
890 "Require the VM to acquire the class loader lock before calling " \
891 "loadClass() even for class loaders registering " \
892 "as parallel capable") \
893 \
894 product(bool, AllowParallelDefineClass, false, \
895 "Allow parallel defineClass requests for class loaders " \
896 "registering as parallel capable") \
897 \
898 product(bool, MustCallLoadClassInternal, false, \
899 "Call loadClassInternal() rather than loadClass()") \
900 \
901 product_pd(bool, DontYieldALot, \
902 "Throw away obvious excess yield calls (for SOLARIS only)") \
903 \
904 product_pd(bool, ConvertSleepToYield, \
905 "Converts sleep(0) to thread yield " \
906 "(may be off for SOLARIS to improve GUI)") \
907 \
908 product(bool, ConvertYieldToSleep, false, \
909 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
910 "behavior (SOLARIS only)") \
911 \
912 product(bool, UseBoundThreads, true, \
913 "Bind user level threads to kernel threads (for SOLARIS only)") \
914 \
915 develop(bool, UseDetachedThreads, true, \
916 "Use detached threads that are recycled upon termination " \
917 "(for SOLARIS only)") \
918 \
919 product(bool, UseLWPSynchronization, true, \
920 "Use LWP-based instead of libthread-based synchronization " \
921 "(SPARC only)") \
922 \
923 product(ccstr, SyncKnobs, NULL, \
924 "(Unstable) Various monitor synchronization tunables") \
925 \
926 product(intx, EmitSync, 0, \
927 "(Unsafe,Unstable) " \
928 " Controls emission of inline sync fast-path code") \
929 \
930 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
931 \
932 product(intx, MonitorBound, 0, "Bound Monitor population") \
933 \
934 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
935 \
936 product(intx, Atomics, 0, \
937 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
938 \
939 product(intx, FenceInstruction, 0, \
940 "(Unsafe,Unstable) Experimental") \
941 \
942 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
943 \
944 product(intx, SyncVerbose, 0, "(Unstable)" ) \
945 \
946 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
947 \
948 product(intx, hashCode, 0, \
949 "(Unstable) select hashCode generation algorithm" ) \
950 \
951 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
952 "(Unstable, Linux-specific)" \
953 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
954 \
955 product(bool, FilterSpuriousWakeups, true, \
956 "Prevent spurious or premature wakeups from object.wait " \
957 "(Solaris only)") \
958 \
959 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
960 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
961 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
962 \
963 develop(bool, UsePthreads, false, \
964 "Use pthread-based instead of libthread-based synchronization " \
965 "(SPARC only)") \
966 \
967 product(bool, AdjustConcurrency, false, \
968 "call thr_setconcurrency at thread create time to avoid " \
969 "LWP starvation on MP systems (For Solaris Only)") \
970 \
971 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
972 "Should the system attempt to update the compiler file when " \
973 "an error occurs?") \
974 \
975 product(bool, ReduceSignalUsage, false, \
976 "Reduce the use of OS signals in Java and/or the VM") \
977 \
978 notproduct(bool, ValidateMarkSweep, false, \
979 "Do extra validation during MarkSweep collection") \
980 \
981 notproduct(bool, RecordMarkSweepCompaction, false, \
982 "Enable GC-to-GC recording and querying of compaction during " \
983 "MarkSweep") \
984 \
985 develop_pd(bool, ShareVtableStubs, \
986 "Share vtable stubs (smaller code but worse branch prediction") \
987 \
988 develop(bool, LoadLineNumberTables, true, \
989 "Tells whether the class file parser loads line number tables") \
990 \
991 develop(bool, LoadLocalVariableTables, true, \
992 "Tells whether the class file parser loads local variable tables")\
993 \
994 develop(bool, LoadLocalVariableTypeTables, true, \
995 "Tells whether the class file parser loads local variable type tables")\
996 \
997 product(bool, AllowUserSignalHandlers, false, \
998 "Do not complain if the application installs signal handlers " \
999 "(Solaris & Linux only)") \
1000 \
1001 product(bool, UseSignalChaining, true, \
1002 "Use signal-chaining to invoke signal handlers installed " \
1003 "by the application (Solaris & Linux only)") \
1004 \
1005 product(bool, UseAltSigs, false, \
1006 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1007 "internal signals (Solaris only)") \
1008 \
1009 product(bool, UseSpinning, false, \
1010 "Use spinning in monitor inflation and before entry") \
1011 \
1012 product(bool, PreSpinYield, false, \
1013 "Yield before inner spinning loop") \
1014 \
1015 product(bool, PostSpinYield, true, \
1016 "Yield after inner spinning loop") \
1017 \
1018 product(bool, AllowJNIEnvProxy, false, \
1019 "Allow JNIEnv proxies for jdbx") \
1020 \
1021 product(bool, JNIDetachReleasesMonitors, true, \
1022 "JNI DetachCurrentThread releases monitors owned by thread") \
1023 \
1024 product(bool, RestoreMXCSROnJNICalls, false, \
1025 "Restore MXCSR when returning from JNI calls") \
1026 \
1027 product(bool, CheckJNICalls, false, \
1028 "Verify all arguments to JNI calls") \
1029 \
1030 product(bool, UseFastJNIAccessors, true, \
1031 "Use optimized versions of Get<Primitive>Field") \
1032 \
1033 product(bool, EagerXrunInit, false, \
1034 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1035 " but not all -Xrun libraries may support the state of the VM at this time") \
1036 \
1037 product(bool, PreserveAllAnnotations, false, \
1038 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1039 \
1040 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1041 "Number of OutOfMemoryErrors preallocated with backtrace") \
1042 \
1043 product(bool, LazyBootClassLoader, true, \
1044 "Enable/disable lazy opening of boot class path entries") \
1045 \
1046 diagnostic(bool, UseIncDec, true, \
1047 "Use INC, DEC instructions on x86") \
1048 \
1049 product(bool, UseNewLongLShift, false, \
1050 "Use optimized bitwise shift left") \
1051 \
1052 product(bool, UseStoreImmI16, true, \
1053 "Use store immediate 16-bits value instruction on x86") \
1054 \
1055 product(bool, UseAddressNop, false, \
1056 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1057 \
1058 product(bool, UseXmmLoadAndClearUpper, true, \
1059 "Load low part of XMM register and clear upper part") \
1060 \
1061 product(bool, UseXmmRegToRegMoveAll, false, \
1062 "Copy all XMM register bits when moving value between registers") \
1063 \
1064 product(bool, UseXmmI2D, false, \
1065 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1066 \
1067 product(bool, UseXmmI2F, false, \
1068 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1069 \
1070 product(bool, UseXMMForArrayCopy, false, \
1071 "Use SSE2 MOVQ instruction for Arraycopy") \
1072 \
1073 product(bool, UseUnalignedLoadStores, false, \
1074 "Use SSE2 MOVDQU instruction for Arraycopy") \
1075 \
1076 product(intx, FieldsAllocationStyle, 1, \
1077 "0 - type based with oops first, 1 - with oops last, " \
1078 "2 - oops in super and sub classes are together") \
1079 \
1080 product(bool, CompactFields, true, \
1081 "Allocate nonstatic fields in gaps between previous fields") \
1082 \
1083 notproduct(bool, PrintCompactFieldsSavings, false, \
1084 "Print how many words were saved with CompactFields") \
1085 \
1086 product(bool, UseBiasedLocking, true, \
1087 "Enable biased locking in JVM") \
1088 \
1089 product(intx, BiasedLockingStartupDelay, 4000, \
1090 "Number of milliseconds to wait before enabling biased locking") \
1091 \
1092 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1093 "Print statistics of biased locking in JVM") \
1094 \
1095 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1096 "Threshold of number of revocations per type to try to " \
1097 "rebias all objects in the heap of that type") \
1098 \
1099 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1100 "Threshold of number of revocations per type to permanently " \
1101 "revoke biases of all objects in the heap of that type") \
1102 \
1103 product(intx, BiasedLockingDecayTime, 25000, \
1104 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1105 "type after previous bulk rebias") \
1106 \
1107 /* tracing */ \
1108 \
1109 notproduct(bool, TraceRuntimeCalls, false, \
1110 "Trace run-time calls") \
1111 \
1112 develop(bool, TraceJNICalls, false, \
1113 "Trace JNI calls") \
1114 \
1115 notproduct(bool, TraceJVMCalls, false, \
1116 "Trace JVM calls") \
1117 \
1118 product(ccstr, TraceJVMTI, NULL, \
1119 "Trace flags for JVMTI functions and events") \
1120 \
1121 product(bool, ForceFullGCJVMTIEpilogues, false, \
1122 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \
1123 \
1124 /* This option can change an EMCP method into an obsolete method. */ \
1125 /* This can affect tests that except specific methods to be EMCP. */ \
1126 /* This option should be used with caution. */ \
1127 product(bool, StressLdcRewrite, false, \
1128 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1129 \
1130 product(intx, TraceRedefineClasses, 0, \
1131 "Trace level for JVMTI RedefineClasses") \
1132 \
1133 develop(bool, StressMethodComparator, false, \
1134 "run the MethodComparator on all loaded methods") \
1135 \
1136 /* change to false by default sometime after Mustang */ \
1137 product(bool, VerifyMergedCPBytecodes, true, \
1138 "Verify bytecodes after RedefineClasses constant pool merging") \
1139 \
1140 develop(bool, TraceJNIHandleAllocation, false, \
1141 "Trace allocation/deallocation of JNI handle blocks") \
1142 \
1143 develop(bool, TraceThreadEvents, false, \
1144 "Trace all thread events") \
1145 \
1146 develop(bool, TraceBytecodes, false, \
1147 "Trace bytecode execution") \
1148 \
1149 develop(bool, TraceClassInitialization, false, \
1150 "Trace class initialization") \
1151 \
1152 develop(bool, TraceExceptions, false, \
1153 "Trace exceptions") \
1154 \
1155 develop(bool, TraceICs, false, \
1156 "Trace inline cache changes") \
1157 \
1158 notproduct(bool, TraceInvocationCounterOverflow, false, \
1159 "Trace method invocation counter overflow") \
1160 \
1161 develop(bool, TraceInlineCacheClearing, false, \
1162 "Trace clearing of inline caches in nmethods") \
1163 \
1164 develop(bool, TraceDependencies, false, \
1165 "Trace dependencies") \
1166 \
1167 develop(bool, VerifyDependencies, trueInDebug, \
1168 "Exercise and verify the compilation dependency mechanism") \
1169 \
1170 develop(bool, TraceNewOopMapGeneration, false, \
1171 "Trace OopMapGeneration") \
1172 \
1173 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1174 "Trace OopMapGeneration: print detailed cell states") \
1175 \
1176 develop(bool, TimeOopMap, false, \
1177 "Time calls to GenerateOopMap::compute_map() in sum") \
1178 \
1179 develop(bool, TimeOopMap2, false, \
1180 "Time calls to GenerateOopMap::compute_map() individually") \
1181 \
1182 develop(bool, TraceMonitorMismatch, false, \
1183 "Trace monitor matching failures during OopMapGeneration") \
1184 \
1185 develop(bool, TraceOopMapRewrites, false, \
1186 "Trace rewritting of method oops during oop map generation") \
1187 \
1188 develop(bool, TraceSafepoint, false, \
1189 "Trace safepoint operations") \
1190 \
1191 develop(bool, TraceICBuffer, false, \
1192 "Trace usage of IC buffer") \
1193 \
1194 develop(bool, TraceCompiledIC, false, \
1195 "Trace changes of compiled IC") \
1196 \
1197 notproduct(bool, TraceZapDeadLocals, false, \
1198 "Trace zapping dead locals") \
1199 \
1200 develop(bool, TraceStartupTime, false, \
1201 "Trace setup time") \
1202 \
1203 develop(bool, TraceHPI, false, \
1204 "Trace Host Porting Interface (HPI)") \
1205 \
1206 product(ccstr, HPILibPath, NULL, \
1207 "Specify alternate path to HPI library") \
1208 \
1209 develop(bool, TraceProtectionDomainVerification, false, \
1210 "Trace protection domain verifcation") \
1211 \
1212 develop(bool, TraceClearedExceptions, false, \
1213 "Prints when an exception is forcibly cleared") \
1214 \
1215 product(bool, TraceClassResolution, false, \
1216 "Trace all constant pool resolutions (for debugging)") \
1217 \
1218 product(bool, TraceBiasedLocking, false, \
1219 "Trace biased locking in JVM") \
1220 \
1221 product(bool, TraceMonitorInflation, false, \
1222 "Trace monitor inflation in JVM") \
1223 \
1224 /* assembler */ \
1225 product(bool, Use486InstrsOnly, false, \
1226 "Use 80486 Compliant instruction subset") \
1227 \
1228 /* gc */ \
1229 \
1230 product(bool, UseSerialGC, false, \
1231 "Use the serial garbage collector") \
1232 \
1233 product(bool, UseG1GC, false, \
1234 "Use the Garbage-First garbage collector") \
1235 \
1236 product(bool, UseParallelGC, false, \
1237 "Use the Parallel Scavenge garbage collector") \
1238 \
1239 product(bool, UseParallelOldGC, false, \
1240 "Use the Parallel Old garbage collector") \
1241 \
1242 product(bool, UseParallelOldGCCompacting, true, \
1243 "In the Parallel Old garbage collector use parallel compaction") \
1244 \
1245 product(bool, UseParallelDensePrefixUpdate, true, \
1246 "In the Parallel Old garbage collector use parallel dense" \
1247 " prefix update") \
1248 \
1249 product(uintx, HeapMaximumCompactionInterval, 20, \
1250 "How often should we maximally compact the heap (not allowing " \
1251 "any dead space)") \
1252 \
1253 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1254 "The collection count for the first maximum compaction") \
1255 \
1256 product(bool, UseMaximumCompactionOnSystemGC, true, \
1257 "In the Parallel Old garbage collector maximum compaction for " \
1258 "a system GC") \
1259 \
1260 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1261 "The mean used by the par compact dead wood" \
1262 "limiter (a number between 0-100).") \
1263 \
1264 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1265 "The standard deviation used by the par compact dead wood" \
1266 "limiter (a number between 0-100).") \
1267 \
1268 product(bool, UseParallelOldGCDensePrefix, true, \
1269 "Use a dense prefix with the Parallel Old garbage collector") \
1270 \
1271 product(uintx, ParallelGCThreads, 0, \
1272 "Number of parallel threads parallel gc will use") \
1273 \
1274 develop(bool, ParallelOldGCSplitALot, false, \
1275 "Provoke splitting (copying data from a young gen space to" \
1276 "multiple destination spaces)") \
1277 \
1278 develop(uintx, ParallelOldGCSplitInterval, 3, \
1279 "How often to provoke splitting a young gen space") \
1280 \
1281 develop(bool, TraceRegionTasksQueuing, false, \
1282 "Trace the queuing of the region tasks") \
1283 \
1284 product(uintx, ConcGCThreads, 0, \
1285 "Number of threads concurrent gc will use") \
1286 \
1287 product(uintx, YoungPLABSize, 4096, \
1288 "Size of young gen promotion labs (in HeapWords)") \
1289 \
1290 product(uintx, OldPLABSize, 1024, \
1291 "Size of old gen promotion labs (in HeapWords)") \
1292 \
1293 product(uintx, GCTaskTimeStampEntries, 200, \
1294 "Number of time stamp entries per gc worker thread") \
1295 \
1296 product(bool, AlwaysTenure, false, \
1297 "Always tenure objects in eden. (ParallelGC only)") \
1298 \
1299 product(bool, NeverTenure, false, \
1300 "Never tenure objects in eden, May tenure on overflow " \
1301 "(ParallelGC only)") \
1302 \
1303 product(bool, ScavengeBeforeFullGC, true, \
1304 "Scavenge youngest generation before each full GC, " \
1305 "used with UseParallelGC") \
1306 \
1307 develop(bool, ScavengeWithObjectsInToSpace, false, \
1308 "Allow scavenges to occur when to_space contains objects.") \
1309 \
1310 product(bool, UseConcMarkSweepGC, false, \
1311 "Use Concurrent Mark-Sweep GC in the old generation") \
1312 \
1313 product(bool, ExplicitGCInvokesConcurrent, false, \
1314 "A System.gc() request invokes a concurrent collection;" \
1315 " (effective only when UseConcMarkSweepGC)") \
1316 \
1317 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1318 "A System.gc() request invokes a concurrent collection and " \
1319 "also unloads classes during such a concurrent gc cycle " \
1320 "(effective only when UseConcMarkSweepGC)") \
1321 \
1322 product(bool, GCLockerInvokesConcurrent, false, \
1323 "The exit of a JNI CS necessitating a scavenge also" \
1324 " kicks off a bkgrd concurrent collection") \
1325 \
1326 develop(bool, UseCMSAdaptiveFreeLists, true, \
1327 "Use Adaptive Free Lists in the CMS generation") \
1328 \
1329 develop(bool, UseAsyncConcMarkSweepGC, true, \
1330 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1331 \
1332 develop(bool, RotateCMSCollectionTypes, false, \
1333 "Rotate the CMS collections among concurrent and STW") \
1334 \
1335 product(bool, UseCMSBestFit, true, \
1336 "Use CMS best fit allocation strategy") \
1337 \
1338 product(bool, UseCMSCollectionPassing, true, \
1339 "Use passing of collection from background to foreground") \
1340 \
1341 product(bool, UseParNewGC, false, \
1342 "Use parallel threads in the new generation.") \
1343 \
1344 product(bool, ParallelGCVerbose, false, \
1345 "Verbose output for parallel GC.") \
1346 \
1347 product(intx, ParallelGCBufferWastePct, 10, \
1348 "wasted fraction of parallel allocation buffer.") \
1349 \
1350 product(bool, ParallelGCRetainPLAB, true, \
1351 "Retain parallel allocation buffers across scavenges.") \
1352 \
1353 product(intx, TargetPLABWastePct, 10, \
1354 "target wasted space in last buffer as pct of overall allocation")\
1355 \
1356 product(uintx, PLABWeight, 75, \
1357 "Percentage (0-100) used to weight the current sample when" \
1358 "computing exponentially decaying average for ResizePLAB.") \
1359 \
1360 product(bool, ResizePLAB, true, \
1361 "Dynamically resize (survivor space) promotion labs") \
1362 \
1363 product(bool, PrintPLAB, false, \
1364 "Print (survivor space) promotion labs sizing decisions") \
1365 \
1366 product(intx, ParGCArrayScanChunk, 50, \
1367 "Scan a subset and push remainder, if array is bigger than this") \
1368 \
1369 product(bool, ParGCUseLocalOverflow, false, \
1370 "Instead of a global overflow list, use local overflow stacks") \
1371 \
1372 product(bool, ParGCTrimOverflow, true, \
1373 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1374 \
1375 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1376 "Whether we should simulate work queue overflow in ParNew") \
1377 \
1378 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1379 "An `interval' counter that determines how frequently " \
1380 "we simulate overflow; a smaller number increases frequency") \
1381 \
1382 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1383 "The desired number of objects to claim from the overflow list") \
1384 \
1385 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1386 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1387 "parallel GC.") \
1388 \
1389 product(uintx, OldPLABWeight, 50, \
1390 "Percentage (0-100) used to weight the current sample when" \
1391 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1392 \
1393 product(bool, ResizeOldPLAB, true, \
1394 "Dynamically resize (old gen) promotion labs") \
1395 \
1396 product(bool, PrintOldPLAB, false, \
1397 "Print (old gen) promotion labs sizing decisions") \
1398 \
1399 product(uintx, CMSOldPLABMin, 16, \
1400 "Min size of CMS gen promotion lab caches per worker per blksize")\
1401 \
1402 product(uintx, CMSOldPLABMax, 1024, \
1403 "Max size of CMS gen promotion lab caches per worker per blksize")\
1404 \
1405 product(uintx, CMSOldPLABNumRefills, 4, \
1406 "Nominal number of refills of CMS gen promotion lab cache" \
1407 " per worker per block size") \
1408 \
1409 product(bool, CMSOldPLABResizeQuicker, false, \
1410 "Whether to react on-the-fly during a scavenge to a sudden" \
1411 " change in block demand rate") \
1412 \
1413 product(uintx, CMSOldPLABToleranceFactor, 4, \
1414 "The tolerance of the phase-change detector for on-the-fly" \
1415 " PLAB resizing during a scavenge") \
1416 \
1417 product(uintx, CMSOldPLABReactivityFactor, 2, \
1418 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1419 " during a scavenge") \
1420 \
1421 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1422 "The clamping of the gain in the feedback loop for on-the-fly" \
1423 " PLAB resizing during a scavenge") \
1424 \
1425 product(bool, AlwaysPreTouch, false, \
1426 "It forces all freshly committed pages to be pre-touched.") \
1427 \
1428 product(bool, CMSUseOldDefaults, false, \
1429 "A flag temporarily introduced to allow reverting to some " \
1430 "older default settings; older as of 6.0") \
1431 \
1432 product(intx, CMSYoungGenPerWorker, 16*M, \
1433 "The amount of young gen chosen by default per GC worker " \
1434 "thread available") \
1435 \
1436 product(bool, GCOverheadReporting, false, \
1437 "Enables the GC overhead reporting facility") \
1438 \
1439 product(intx, GCOverheadReportingPeriodMS, 100, \
1440 "Reporting period for conc GC overhead reporting, in ms ") \
1441 \
1442 product(bool, CMSIncrementalMode, false, \
1443 "Whether CMS GC should operate in \"incremental\" mode") \
1444 \
1445 product(uintx, CMSIncrementalDutyCycle, 10, \
1446 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1447 "CMSIncrementalPacing is enabled, then this is just the initial" \
1448 "value") \
1449 \
1450 product(bool, CMSIncrementalPacing, true, \
1451 "Whether the CMS incremental mode duty cycle should be " \
1452 "automatically adjusted") \
1453 \
1454 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1455 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1456 "enabled (a percentage, 0-100)") \
1457 \
1458 product(uintx, CMSIncrementalSafetyFactor, 10, \
1459 "Percentage (0-100) used to add conservatism when computing the " \
1460 "duty cycle") \
1461 \
1462 product(uintx, CMSIncrementalOffset, 0, \
1463 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1464 " is shifted to the right within the period between young GCs") \
1465 \
1466 product(uintx, CMSExpAvgFactor, 50, \
1467 "Percentage (0-100) used to weight the current sample when" \
1468 "computing exponential averages for CMS statistics.") \
1469 \
1470 product(uintx, CMS_FLSWeight, 75, \
1471 "Percentage (0-100) used to weight the current sample when" \
1472 "computing exponentially decating averages for CMS FLS statistics.") \
1473 \
1474 product(uintx, CMS_FLSPadding, 1, \
1475 "The multiple of deviation from mean to use for buffering" \
1476 "against volatility in free list demand.") \
1477 \
1478 product(uintx, FLSCoalescePolicy, 2, \
1479 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1480 \
1481 product(bool, FLSAlwaysCoalesceLarge, false, \
1482 "CMS: Larger free blocks are always available for coalescing") \
1483 \
1484 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1485 "CMS: the smaller the percentage the greater the coalition force")\
1486 \
1487 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1488 "CMS: the factor by which to inflate estimated demand of small" \
1489 " block sizes to prevent coalescing with an adjoining block") \
1490 \
1491 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1492 "CMS: the factor by which to inflate estimated demand of large" \
1493 " block sizes to prevent coalescing with an adjoining block") \
1494 \
1495 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1496 "CMS: the factor by which to inflate estimated demand of small" \
1497 " block sizes to prevent splitting to supply demand for smaller" \
1498 " blocks") \
1499 \
1500 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1501 "CMS: the factor by which to inflate estimated demand of large" \
1502 " block sizes to prevent splitting to supply demand for smaller" \
1503 " blocks") \
1504 \
1505 product(bool, CMSExtrapolateSweep, false, \
1506 "CMS: cushion for block demand during sweep") \
1507 \
1508 product(uintx, CMS_SweepWeight, 75, \
1509 "Percentage (0-100) used to weight the current sample when " \
1510 "computing exponentially decaying average for inter-sweep " \
1511 "duration") \
1512 \
1513 product(uintx, CMS_SweepPadding, 1, \
1514 "The multiple of deviation from mean to use for buffering " \
1515 "against volatility in inter-sweep duration.") \
1516 \
1517 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1518 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1519 "duration exceeds this threhold in milliseconds") \
1520 \
1521 develop(bool, CMSTraceIncrementalMode, false, \
1522 "Trace CMS incremental mode") \
1523 \
1524 develop(bool, CMSTraceIncrementalPacing, false, \
1525 "Trace CMS incremental mode pacing computation") \
1526 \
1527 develop(bool, CMSTraceThreadState, false, \
1528 "Trace the CMS thread state (enable the trace_state() method)") \
1529 \
1530 product(bool, CMSClassUnloadingEnabled, false, \
1531 "Whether class unloading enabled when using CMS GC") \
1532 \
1533 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1534 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1535 " for which classes may not be unloaded") \
1536 \
1537 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1538 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1539 \
1540 product(bool, UseCMSCompactAtFullCollection, true, \
1541 "Use mark sweep compact at full collections") \
1542 \
1543 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1544 "Number of CMS full collection done before compaction if > 0") \
1545 \
1546 develop(intx, CMSDictionaryChoice, 0, \
1547 "Use BinaryTreeDictionary as default in the CMS generation") \
1548 \
1549 product(uintx, CMSIndexedFreeListReplenish, 4, \
1550 "Replenish an indexed free list with this number of chunks") \
1551 \
1552 product(bool, CMSReplenishIntermediate, true, \
1553 "Replenish all intermediate free-list caches") \
1554 \
1555 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1556 "When satisfying batched demand, split blocks from the " \
1557 "IndexedFreeList whose size is a multiple of requested size") \
1558 \
1559 product(bool, CMSLoopWarn, false, \
1560 "Warn in case of excessive CMS looping") \
1561 \
1562 develop(bool, CMSOverflowEarlyRestoration, false, \
1563 "Whether preserved marks should be restored early") \
1564 \
1565 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1566 "Size of marking stack") \
1567 \
1568 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1569 "Max size of marking stack") \
1570 \
1571 notproduct(bool, CMSMarkStackOverflowALot, false, \
1572 "Whether we should simulate frequent marking stack / work queue" \
1573 " overflow") \
1574 \
1575 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1576 "An `interval' counter that determines how frequently" \
1577 " we simulate overflow; a smaller number increases frequency") \
1578 \
1579 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1580 "(Temporary, subject to experimentation)" \
1581 "Maximum number of abortable preclean iterations, if > 0") \
1582 \
1583 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1584 "(Temporary, subject to experimentation)" \
1585 "Maximum time in abortable preclean in ms") \
1586 \
1587 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1588 "(Temporary, subject to experimentation)" \
1589 "Nominal minimum work per abortable preclean iteration") \
1590 \
1591 product(intx, CMSAbortablePrecleanWaitMillis, 100, \
1592 "(Temporary, subject to experimentation)" \
1593 " Time that we sleep between iterations when not given" \
1594 " enough work per iteration") \
1595 \
1596 product(uintx, CMSRescanMultiple, 32, \
1597 "Size (in cards) of CMS parallel rescan task") \
1598 \
1599 product(uintx, CMSConcMarkMultiple, 32, \
1600 "Size (in cards) of CMS concurrent MT marking task") \
1601 \
1602 product(uintx, CMSRevisitStackSize, 1*M, \
1603 "Size of CMS KlassKlass revisit stack") \
1604 \
1605 product(bool, CMSAbortSemantics, false, \
1606 "Whether abort-on-overflow semantics is implemented") \
1607 \
1608 product(bool, CMSParallelRemarkEnabled, true, \
1609 "Whether parallel remark enabled (only if ParNewGC)") \
1610 \
1611 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1612 "Whether parallel remark of survivor space" \
1613 " enabled (effective only if CMSParallelRemarkEnabled)") \
1614 \
1615 product(bool, CMSPLABRecordAlways, true, \
1616 "Whether to always record survivor space PLAB bdries" \
1617 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1618 \
1619 product(bool, CMSConcurrentMTEnabled, true, \
1620 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1621 \
1622 product(bool, CMSPermGenPrecleaningEnabled, true, \
1623 "Whether concurrent precleaning enabled in perm gen" \
1624 " (effective only when CMSPrecleaningEnabled is true)") \
1625 \
1626 product(bool, CMSPrecleaningEnabled, true, \
1627 "Whether concurrent precleaning enabled") \
1628 \
1629 product(uintx, CMSPrecleanIter, 3, \
1630 "Maximum number of precleaning iteration passes") \
1631 \
1632 product(uintx, CMSPrecleanNumerator, 2, \
1633 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1634 " ratio") \
1635 \
1636 product(uintx, CMSPrecleanDenominator, 3, \
1637 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1638 " ratio") \
1639 \
1640 product(bool, CMSPrecleanRefLists1, true, \
1641 "Preclean ref lists during (initial) preclean phase") \
1642 \
1643 product(bool, CMSPrecleanRefLists2, false, \
1644 "Preclean ref lists during abortable preclean phase") \
1645 \
1646 product(bool, CMSPrecleanSurvivors1, false, \
1647 "Preclean survivors during (initial) preclean phase") \
1648 \
1649 product(bool, CMSPrecleanSurvivors2, true, \
1650 "Preclean survivors during abortable preclean phase") \
1651 \
1652 product(uintx, CMSPrecleanThreshold, 1000, \
1653 "Don't re-iterate if #dirty cards less than this") \
1654 \
1655 product(bool, CMSCleanOnEnter, true, \
1656 "Clean-on-enter optimization for reducing number of dirty cards") \
1657 \
1658 product(uintx, CMSRemarkVerifyVariant, 1, \
1659 "Choose variant (1,2) of verification following remark") \
1660 \
1661 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1662 "If Eden used is below this value, don't try to schedule remark") \
1663 \
1664 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1665 "The Eden occupancy % at which to try and schedule remark pause") \
1666 \
1667 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1668 "Start sampling Eden top at least before yg occupancy reaches" \
1669 " 1/<ratio> of the size at which we plan to schedule remark") \
1670 \
1671 product(uintx, CMSSamplingGrain, 16*K, \
1672 "The minimum distance between eden samples for CMS (see above)") \
1673 \
1674 product(bool, CMSScavengeBeforeRemark, false, \
1675 "Attempt scavenge before the CMS remark step") \
1676 \
1677 develop(bool, CMSTraceSweeper, false, \
1678 "Trace some actions of the CMS sweeper") \
1679 \
1680 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1681 "Don't drain below this size per parallel worker/thief") \
1682 \
1683 product(intx, CMSWaitDuration, 2000, \
1684 "Time in milliseconds that CMS thread waits for young GC") \
1685 \
1686 product(bool, CMSYield, true, \
1687 "Yield between steps of concurrent mark & sweep") \
1688 \
1689 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1690 "Bitmap operations should process at most this many bits" \
1691 "between yields") \
1692 \
1693 product(bool, CMSDumpAtPromotionFailure, false, \
1694 "Dump useful information about the state of the CMS old " \
1695 " generation upon a promotion failure.") \
1696 \
1697 product(bool, CMSPrintChunksInDump, false, \
1698 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1699 " more detailed information about the free chunks.") \
1700 \
1701 product(bool, CMSPrintObjectsInDump, false, \
1702 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1703 " more detailed information about the allocated objects.") \
1704 \
1705 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1706 "Verify that all refs across the FLS boundary " \
1707 " are to valid objects") \
1708 \
1709 diagnostic(bool, FLSVerifyLists, false, \
1710 "Do lots of (expensive) FreeListSpace verification") \
1711 \
1712 diagnostic(bool, FLSVerifyIndexTable, false, \
1713 "Do lots of (expensive) FLS index table verification") \
1714 \
1715 develop(bool, FLSVerifyDictionary, false, \
1716 "Do lots of (expensive) FLS dictionary verification") \
1717 \
1718 develop(bool, VerifyBlockOffsetArray, false, \
1719 "Do (expensive!) block offset array verification") \
1720 \
1721 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1722 "Maintain _unallocated_block in BlockOffsetArray" \
1723 " (currently applicable only to CMS collector)") \
1724 \
1725 develop(bool, TraceCMSState, false, \
1726 "Trace the state of the CMS collection") \
1727 \
1728 product(intx, RefDiscoveryPolicy, 0, \
1729 "Whether reference-based(0) or referent-based(1)") \
1730 \
1731 product(bool, ParallelRefProcEnabled, false, \
1732 "Enable parallel reference processing whenever possible") \
1733 \
1734 product(bool, ParallelRefProcBalancingEnabled, true, \
1735 "Enable balancing of reference processing queues") \
1736 \
1737 product(intx, CMSTriggerRatio, 80, \
1738 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1739 "allocated before a CMS collection cycle commences") \
1740 \
1741 product(intx, CMSTriggerPermRatio, 80, \
1742 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1743 "is allocated before a CMS collection cycle commences, that " \
1744 "also collects the perm generation") \
1745 \
1746 product(uintx, CMSBootstrapOccupancy, 50, \
1747 "Percentage CMS generation occupancy at which to " \
1748 "initiate CMS collection for bootstrapping collection stats") \
1749 \
1750 product(intx, CMSInitiatingOccupancyFraction, -1, \
1751 "Percentage CMS generation occupancy to start a CMS collection " \
1752 "cycle. A negative value means that CMSTriggerRatio is used") \
1753 \
1754 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1755 "Percentage of the (entire) heap occupancy to start a " \
1756 "concurrent GC cycle. It us used by GCs that trigger a " \
1757 "concurrent GC cycle based on the occupancy of the entire heap, " \
1758 "not just one of the generations (e.g., G1). A value of 0 " \
1759 "denotes 'do constant GC cycles'.") \
1760 \
1761 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1762 "Percentage CMS perm generation occupancy to start a " \
1763 "CMScollection cycle. A negative value means that " \
1764 "CMSTriggerPermRatio is used") \
1765 \
1766 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1767 "Only use occupancy as a crierion for starting a CMS collection") \
1768 \
1769 product(intx, CMSIsTooFullPercentage, 98, \
1770 "An absolute ceiling above which CMS will always consider the " \
1771 "perm gen ripe for collection") \
1772 \
1773 develop(bool, CMSTestInFreeList, false, \
1774 "Check if the coalesced range is already in the " \
1775 "free lists as claimed") \
1776 \
1777 notproduct(bool, CMSVerifyReturnedBytes, false, \
1778 "Check that all the garbage collected was returned to the " \
1779 "free lists.") \
1780 \
1781 notproduct(bool, ScavengeALot, false, \
1782 "Force scavenge at every Nth exit from the runtime system " \
1783 "(N=ScavengeALotInterval)") \
1784 \
1785 develop(bool, FullGCALot, false, \
1786 "Force full gc at every Nth exit from the runtime system " \
1787 "(N=FullGCALotInterval)") \
1788 \
1789 notproduct(bool, GCALotAtAllSafepoints, false, \
1790 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1791 \
1792 product(bool, HandlePromotionFailure, true, \
1793 "The youngest generation collection does not require " \
1794 "a guarantee of full promotion of all live objects.") \
1795 \
1796 product(bool, PrintPromotionFailure, false, \
1797 "Print additional diagnostic information following " \
1798 " promotion failure") \
1799 \
1800 notproduct(bool, PromotionFailureALot, false, \
1801 "Use promotion failure handling on every youngest generation " \
1802 "collection") \
1803 \
1804 develop(uintx, PromotionFailureALotCount, 1000, \
1805 "Number of promotion failures occurring at ParGCAllocBuffer" \
1806 "refill attempts (ParNew) or promotion attempts " \
1807 "(other young collectors) ") \
1808 \
1809 develop(uintx, PromotionFailureALotInterval, 5, \
1810 "Total collections between promotion failures alot") \
1811 \
1812 experimental(intx, WorkStealingSleepMillis, 1, \
1813 "Sleep time when sleep is used for yields") \
1814 \
1815 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1816 "Number of yields before a sleep is done during workstealing") \
1817 \
1818 experimental(uintx, WorkStealingHardSpins, 4096, \
1819 "Number of iterations in a spin loop between checks on " \
1820 "time out of hard spin") \
1821 \
1822 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1823 "Ratio of hard spins to calls to yield") \
1824 \
1825 product(uintx, PreserveMarkStackSize, 1024, \
1826 "Size for stack used in promotion failure handling") \
1827 \
1828 develop(uintx, ObjArrayMarkingStride, 512, \
1829 "Number of ObjArray elements to push onto the marking stack" \
1830 "before pushing a continuation entry") \
1831 \
1832 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1833 \
1834 product_pd(bool, ResizeTLAB, \
1835 "Dynamically resize tlab size for threads") \
1836 \
1837 product(bool, ZeroTLAB, false, \
1838 "Zero out the newly created TLAB") \
1839 \
1840 product(bool, FastTLABRefill, true, \
1841 "Use fast TLAB refill code") \
1842 \
1843 product(bool, PrintTLAB, false, \
1844 "Print various TLAB related information") \
1845 \
1846 product(bool, TLABStats, true, \
1847 "Print various TLAB related information") \
1848 \
1849 product(bool, PrintRevisitStats, false, \
1850 "Print revisit (klass and MDO) stack related information") \
1851 \
1852 product_pd(bool, NeverActAsServerClassMachine, \
1853 "Never act like a server-class machine") \
1854 \
1855 product(bool, AlwaysActAsServerClassMachine, false, \
1856 "Always act like a server-class machine") \
1857 \
1858 product_pd(uint64_t, MaxRAM, \
1859 "Real memory size (in bytes) used to set maximum heap size") \
1860 \
1861 product(uintx, ErgoHeapSizeLimit, 0, \
1862 "Maximum ergonomically set heap size (in bytes); zero means use " \
1863 "MaxRAM / MaxRAMFraction") \
1864 \
1865 product(uintx, MaxRAMFraction, 4, \
1866 "Maximum fraction (1/n) of real memory used for maximum heap " \
1867 "size") \
1868 \
1869 product(uintx, DefaultMaxRAMFraction, 4, \
1870 "Maximum fraction (1/n) of real memory used for maximum heap " \
1871 "size; deprecated: to be renamed to MaxRAMFraction") \
1872 \
1873 product(uintx, MinRAMFraction, 2, \
1874 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1875 "size on systems with small physical memory size") \
1876 \
1877 product(uintx, InitialRAMFraction, 64, \
1878 "Fraction (1/n) of real memory used for initial heap size") \
1879 \
1880 product(bool, UseAutoGCSelectPolicy, false, \
1881 "Use automatic collection selection policy") \
1882 \
1883 product(uintx, AutoGCSelectPauseMillis, 5000, \
1884 "Automatic GC selection pause threshhold in ms") \
1885 \
1886 product(bool, UseAdaptiveSizePolicy, true, \
1887 "Use adaptive generation sizing policies") \
1888 \
1889 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1890 "Use adaptive survivor sizing policies") \
1891 \
1892 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1893 "Use adaptive young-old sizing policies at minor collections") \
1894 \
1895 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1896 "Use adaptive young-old sizing policies at major collections") \
1897 \
1898 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1899 "Use statistics from System.GC for adaptive size policy") \
1900 \
1901 product(bool, UseAdaptiveGCBoundary, false, \
1902 "Allow young-old boundary to move") \
1903 \
1904 develop(bool, TraceAdaptiveGCBoundary, false, \
1905 "Trace young-old boundary moves") \
1906 \
1907 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
1908 "Resize the virtual spaces of the young or old generations") \
1909 \
1910 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
1911 "Policy for changeing generation size for throughput goals") \
1912 \
1913 product(uintx, AdaptiveSizePausePolicy, 0, \
1914 "Policy for changing generation size for pause goals") \
1915 \
1916 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
1917 "Adjust tenured generation to achive a minor pause goal") \
1918 \
1919 develop(bool, PSAdjustYoungGenForMajorPause, false, \
1920 "Adjust young generation to achive a major pause goal") \
1921 \
1922 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
1923 "Number of steps where heuristics is used before data is used") \
1924 \
1925 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
1926 "Number of collections before the adaptive sizing is started") \
1927 \
1928 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
1929 "Collecton interval for printing information; zero => never") \
1930 \
1931 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
1932 "Use adaptive minimum footprint as a goal") \
1933 \
1934 product(uintx, AdaptiveSizePolicyWeight, 10, \
1935 "Weight given to exponential resizing, between 0 and 100") \
1936 \
1937 product(uintx, AdaptiveTimeWeight, 25, \
1938 "Weight given to time in adaptive policy, between 0 and 100") \
1939 \
1940 product(uintx, PausePadding, 1, \
1941 "How much buffer to keep for pause time") \
1942 \
1943 product(uintx, PromotedPadding, 3, \
1944 "How much buffer to keep for promotion failure") \
1945 \
1946 product(uintx, SurvivorPadding, 3, \
1947 "How much buffer to keep for survivor overflow") \
1948 \
1949 product(uintx, AdaptivePermSizeWeight, 20, \
1950 "Weight for perm gen exponential resizing, between 0 and 100") \
1951 \
1952 product(uintx, PermGenPadding, 3, \
1953 "How much buffer to keep for perm gen sizing") \
1954 \
1955 product(uintx, ThresholdTolerance, 10, \
1956 "Allowed collection cost difference between generations") \
1957 \
1958 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
1959 "If collection costs are within margin, reduce both by full " \
1960 "delta") \
1961 \
1962 product(uintx, YoungGenerationSizeIncrement, 20, \
1963 "Adaptive size percentage change in young generation") \
1964 \
1965 product(uintx, YoungGenerationSizeSupplement, 80, \
1966 "Supplement to YoungedGenerationSizeIncrement used at startup") \
1967 \
1968 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
1969 "Decay factor to YoungedGenerationSizeSupplement") \
1970 \
1971 product(uintx, TenuredGenerationSizeIncrement, 20, \
1972 "Adaptive size percentage change in tenured generation") \
1973 \
1974 product(uintx, TenuredGenerationSizeSupplement, 80, \
1975 "Supplement to TenuredGenerationSizeIncrement used at startup") \
1976 \
1977 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
1978 "Decay factor to TenuredGenerationSizeIncrement") \
1979 \
1980 product(uintx, MaxGCPauseMillis, max_uintx, \
1981 "Adaptive size policy maximum GC pause time goal in msec, " \
1982 "or (G1 Only) the max. GC time per MMU time slice") \
1983 \
1984 product(uintx, GCPauseIntervalMillis, 0, \
1985 "Time slice for MMU specification") \
1986 \
1987 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
1988 "Adaptive size policy maximum GC minor pause time goal in msec") \
1989 \
1990 product(uintx, GCTimeRatio, 99, \
1991 "Adaptive size policy application time to GC time ratio") \
1992 \
1993 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
1994 "Adaptive size scale down factor for shrinking") \
1995 \
1996 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
1997 "Adaptive size decays the major cost for long major intervals") \
1998 \
1999 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2000 "Time scale over which major costs decay") \
2001 \
2002 product(uintx, MinSurvivorRatio, 3, \
2003 "Minimum ratio of young generation/survivor space size") \
2004 \
2005 product(uintx, InitialSurvivorRatio, 8, \
2006 "Initial ratio of eden/survivor space size") \
2007 \
2008 product(uintx, BaseFootPrintEstimate, 256*M, \
2009 "Estimate of footprint other than Java Heap") \
2010 \
2011 product(bool, UseGCOverheadLimit, true, \
2012 "Use policy to limit of proportion of time spent in GC " \
2013 "before an OutOfMemory error is thrown") \
2014 \
2015 product(uintx, GCTimeLimit, 98, \
2016 "Limit of proportion of time spent in GC before an OutOfMemory" \
2017 "error is thrown (used with GCHeapFreeLimit)") \
2018 \
2019 product(uintx, GCHeapFreeLimit, 2, \
2020 "Minimum percentage of free space after a full GC before an " \
2021 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2022 \
2023 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2024 "Number of consecutive collections before gc time limit fires") \
2025 \
2026 product(bool, PrintAdaptiveSizePolicy, false, \
2027 "Print information about AdaptiveSizePolicy") \
2028 \
2029 product(intx, PrefetchCopyIntervalInBytes, -1, \
2030 "How far ahead to prefetch destination area (<= 0 means off)") \
2031 \
2032 product(intx, PrefetchScanIntervalInBytes, -1, \
2033 "How far ahead to prefetch scan area (<= 0 means off)") \
2034 \
2035 product(intx, PrefetchFieldsAhead, -1, \
2036 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2037 \
2038 develop(bool, UsePrefetchQueue, true, \
2039 "Use the prefetch queue during PS promotion") \
2040 \
2041 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2042 "Verify system before exiting") \
2043 \
2044 diagnostic(bool, VerifyBeforeGC, false, \
2045 "Verify memory system before GC") \
2046 \
2047 diagnostic(bool, VerifyAfterGC, false, \
2048 "Verify memory system after GC") \
2049 \
2050 diagnostic(bool, VerifyDuringGC, false, \
2051 "Verify memory system during GC (between phases)") \
2052 \
2053 diagnostic(bool, GCParallelVerificationEnabled, true, \
2054 "Enable parallel memory system verification") \
2055 \
2056 diagnostic(bool, DeferInitialCardMark, false, \
2057 "When +ReduceInitialCardMarks, explicitly defer any that " \
2058 "may arise from new_pre_store_barrier") \
2059 \
2060 diagnostic(bool, VerifyRememberedSets, false, \
2061 "Verify GC remembered sets") \
2062 \
2063 diagnostic(bool, VerifyObjectStartArray, true, \
2064 "Verify GC object start array if verify before/after") \
2065 \
2066 product(bool, DisableExplicitGC, false, \
2067 "Tells whether calling System.gc() does a full GC") \
2068 \
2069 notproduct(bool, CheckMemoryInitialization, false, \
2070 "Checks memory initialization") \
2071 \
2072 product(bool, CollectGen0First, false, \
2073 "Collect youngest generation before each full GC") \
2074 \
2075 diagnostic(bool, BindCMSThreadToCPU, false, \
2076 "Bind CMS Thread to CPU if possible") \
2077 \
2078 diagnostic(uintx, CPUForCMSThread, 0, \
2079 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2080 \
2081 product(bool, BindGCTaskThreadsToCPUs, false, \
2082 "Bind GCTaskThreads to CPUs if possible") \
2083 \
2084 product(bool, UseGCTaskAffinity, false, \
2085 "Use worker affinity when asking for GCTasks") \
2086 \
2087 product(uintx, ProcessDistributionStride, 4, \
2088 "Stride through processors when distributing processes") \
2089 \
2090 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2091 "number of times the coordinator GC thread will sleep while " \
2092 "yielding before giving up and resuming GC") \
2093 \
2094 product(uintx, CMSYieldSleepCount, 0, \
2095 "number of times a GC thread (minus the coordinator) " \
2096 "will sleep while yielding before giving up and resuming GC") \
2097 \
2098 /* gc tracing */ \
2099 manageable(bool, PrintGC, false, \
2100 "Print message at garbage collect") \
2101 \
2102 manageable(bool, PrintGCDetails, false, \
2103 "Print more details at garbage collect") \
2104 \
2105 manageable(bool, PrintGCDateStamps, false, \
2106 "Print date stamps at garbage collect") \
2107 \
2108 manageable(bool, PrintGCTimeStamps, false, \
2109 "Print timestamps at garbage collect") \
2110 \
2111 product(bool, PrintGCTaskTimeStamps, false, \
2112 "Print timestamps for individual gc worker thread tasks") \
2113 \
2114 develop(intx, ConcGCYieldTimeout, 0, \
2115 "If non-zero, assert that GC threads yield within this # of ms.") \
2116 \
2117 notproduct(bool, TraceMarkSweep, false, \
2118 "Trace mark sweep") \
2119 \
2120 product(bool, PrintReferenceGC, false, \
2121 "Print times spent handling reference objects during GC " \
2122 " (enabled only when PrintGCDetails)") \
2123 \
2124 develop(bool, TraceReferenceGC, false, \
2125 "Trace handling of soft/weak/final/phantom references") \
2126 \
2127 develop(bool, TraceFinalizerRegistration, false, \
2128 "Trace registration of final references") \
2129 \
2130 notproduct(bool, TraceScavenge, false, \
2131 "Trace scavenge") \
2132 \
2133 product_rw(bool, TraceClassLoading, false, \
2134 "Trace all classes loaded") \
2135 \
2136 product(bool, TraceClassLoadingPreorder, false, \
2137 "Trace all classes loaded in order referenced (not loaded)") \
2138 \
2139 product_rw(bool, TraceClassUnloading, false, \
2140 "Trace unloading of classes") \
2141 \
2142 product_rw(bool, TraceLoaderConstraints, false, \
2143 "Trace loader constraints") \
2144 \
2145 product(bool, TraceGen0Time, false, \
2146 "Trace accumulated time for Gen 0 collection") \
2147 \
2148 product(bool, TraceGen1Time, false, \
2149 "Trace accumulated time for Gen 1 collection") \
2150 \
2151 product(bool, PrintTenuringDistribution, false, \
2152 "Print tenuring age information") \
2153 \
2154 product_rw(bool, PrintHeapAtGC, false, \
2155 "Print heap layout before and after each GC") \
2156 \
2157 product_rw(bool, PrintHeapAtGCExtended, false, \
2158 "Prints extended information about the layout of the heap " \
2159 "when -XX:+PrintHeapAtGC is set") \
2160 \
2161 product(bool, PrintHeapAtSIGBREAK, true, \
2162 "Print heap layout in response to SIGBREAK") \
2163 \
2164 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2165 "Print a class histogram before any major stop-world GC") \
2166 \
2167 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2168 "Print a class histogram after any major stop-world GC") \
2169 \
2170 manageable(bool, PrintClassHistogram, false, \
2171 "Print a histogram of class instances") \
2172 \
2173 develop(bool, TraceWorkGang, false, \
2174 "Trace activities of work gangs") \
2175 \
2176 product(bool, TraceParallelOldGCTasks, false, \
2177 "Trace multithreaded GC activity") \
2178 \
2179 develop(bool, TraceBlockOffsetTable, false, \
2180 "Print BlockOffsetTable maps") \
2181 \
2182 develop(bool, TraceCardTableModRefBS, false, \
2183 "Print CardTableModRefBS maps") \
2184 \
2185 develop(bool, TraceGCTaskManager, false, \
2186 "Trace actions of the GC task manager") \
2187 \
2188 develop(bool, TraceGCTaskQueue, false, \
2189 "Trace actions of the GC task queues") \
2190 \
2191 develop(bool, TraceGCTaskThread, false, \
2192 "Trace actions of the GC task threads") \
2193 \
2194 product(bool, PrintParallelOldGCPhaseTimes, false, \
2195 "Print the time taken by each parallel old gc phase." \
2196 "PrintGCDetails must also be enabled.") \
2197 \
2198 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2199 "Trace parallel old gc marking phase") \
2200 \
2201 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2202 "Trace parallel old gc summary phase") \
2203 \
2204 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2205 "Trace parallel old gc compaction phase") \
2206 \
2207 develop(bool, TraceParallelOldGCDensePrefix, false, \
2208 "Trace parallel old gc dense prefix computation") \
2209 \
2210 develop(bool, IgnoreLibthreadGPFault, false, \
2211 "Suppress workaround for libthread GP fault") \
2212 \
2213 product(bool, PrintJNIGCStalls, false, \
2214 "Print diagnostic message when GC is stalled" \
2215 "by JNI critical section") \
2216 \
2217 /* JVMTI heap profiling */ \
2218 \
2219 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2220 "Trace JVMTI object tagging calls") \
2221 \
2222 diagnostic(bool, VerifyBeforeIteration, false, \
2223 "Verify memory system before JVMTI iteration") \
2224 \
2225 /* compiler interface */ \
2226 \
2227 develop(bool, CIPrintCompilerName, false, \
2228 "when CIPrint is active, print the name of the active compiler") \
2229 \
2230 develop(bool, CIPrintCompileQueue, false, \
2231 "display the contents of the compile queue whenever a " \
2232 "compilation is enqueued") \
2233 \
2234 develop(bool, CIPrintRequests, false, \
2235 "display every request for compilation") \
2236 \
2237 product(bool, CITime, false, \
2238 "collect timing information for compilation") \
2239 \
2240 develop(bool, CITimeEach, false, \
2241 "display timing information after each successful compilation") \
2242 \
2243 develop(bool, CICountOSR, true, \
2244 "use a separate counter when assigning ids to osr compilations") \
2245 \
2246 develop(bool, CICompileNatives, true, \
2247 "compile native methods if supported by the compiler") \
2248 \
2249 develop_pd(bool, CICompileOSR, \
2250 "compile on stack replacement methods if supported by the " \
2251 "compiler") \
2252 \
2253 develop(bool, CIPrintMethodCodes, false, \
2254 "print method bytecodes of the compiled code") \
2255 \
2256 develop(bool, CIPrintTypeFlow, false, \
2257 "print the results of ciTypeFlow analysis") \
2258 \
2259 develop(bool, CITraceTypeFlow, false, \
2260 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2261 \
2262 develop(intx, CICloneLoopTestLimit, 100, \
2263 "size limit for blocks heuristically cloned in ciTypeFlow") \
2264 \
2265 /* temp diagnostics */ \
2266 \
2267 diagnostic(bool, TraceRedundantCompiles, false, \
2268 "Have compile broker print when a request already in the queue is"\
2269 " requested again") \
2270 \
2271 diagnostic(bool, InitialCompileFast, false, \
2272 "Initial compile at CompLevel_fast_compile") \
2273 \
2274 diagnostic(bool, InitialCompileReallyFast, false, \
2275 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2276 \
2277 diagnostic(bool, FullProfileOnReInterpret, true, \
2278 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2279 \
2280 /* compiler */ \
2281 \
2282 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2283 "Number of compiler threads to run") \
2284 \
2285 product(intx, CompilationPolicyChoice, 0, \
2286 "which compilation policy (0/1)") \
2287 \
2288 develop(bool, UseStackBanging, true, \
2289 "use stack banging for stack overflow checks (required for " \
2290 "proper StackOverflow handling; disable only to measure cost " \
2291 "of stackbanging)") \
2292 \
2293 develop(bool, Use24BitFPMode, true, \
2294 "Set 24-bit FPU mode on a per-compile basis ") \
2295 \
2296 develop(bool, Use24BitFP, true, \
2297 "use FP instructions that produce 24-bit precise results") \
2298 \
2299 develop(bool, UseStrictFP, true, \
2300 "use strict fp if modifier strictfp is set") \
2301 \
2302 develop(bool, GenerateSynchronizationCode, true, \
2303 "generate locking/unlocking code for synchronized methods and " \
2304 "monitors") \
2305 \
2306 develop(bool, GenerateCompilerNullChecks, true, \
2307 "Generate explicit null checks for loads/stores/calls") \
2308 \
2309 develop(bool, GenerateRangeChecks, true, \
2310 "Generate range checks for array accesses") \
2311 \
2312 develop_pd(bool, ImplicitNullChecks, \
2313 "generate code for implicit null checks") \
2314 \
2315 product(bool, PrintSafepointStatistics, false, \
2316 "print statistics about safepoint synchronization") \
2317 \
2318 product(intx, PrintSafepointStatisticsCount, 300, \
2319 "total number of safepoint statistics collected " \
2320 "before printing them out") \
2321 \
2322 product(intx, PrintSafepointStatisticsTimeout, -1, \
2323 "print safepoint statistics only when safepoint takes" \
2324 " more than PrintSafepointSatisticsTimeout in millis") \
2325 \
2326 product(bool, TraceSafepointCleanupTime, false, \
2327 "print the break down of clean up tasks performed during" \
2328 " safepoint") \
2329 \
2330 develop(bool, InlineAccessors, true, \
2331 "inline accessor methods (get/set)") \
2332 \
2333 product(bool, Inline, true, \
2334 "enable inlining") \
2335 \
2336 product(bool, ClipInlining, true, \
2337 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2338 \
2339 develop(bool, UseCHA, true, \
2340 "enable CHA") \
2341 \
2342 product(bool, UseTypeProfile, true, \
2343 "Check interpreter profile for historically monomorphic calls") \
2344 \
2345 product(intx, TypeProfileMajorReceiverPercent, 90, \
2346 "% of major receiver type to all profiled receivers") \
2347 \
2348 notproduct(bool, TimeCompiler, false, \
2349 "time the compiler") \
2350 \
2351 notproduct(bool, TimeCompiler2, false, \
2352 "detailed time the compiler (requires +TimeCompiler)") \
2353 \
2354 diagnostic(bool, PrintInlining, false, \
2355 "prints inlining optimizations") \
2356 \
2357 diagnostic(bool, PrintIntrinsics, false, \
2358 "prints attempted and successful inlining of intrinsics") \
2359 \
2360 product(bool, UseCountLeadingZerosInstruction, false, \
2361 "Use count leading zeros instruction") \
2362 \
2363 product(bool, UsePopCountInstruction, false, \
2364 "Use population count instruction") \
2365 \
2366 diagnostic(ccstrlist, DisableIntrinsic, "", \
2367 "do not expand intrinsics whose (internal) names appear here") \
2368 \
2369 develop(bool, StressReflectiveCode, false, \
2370 "Use inexact types at allocations, etc., to test reflection") \
2371 \
2372 develop(bool, EagerInitialization, false, \
2373 "Eagerly initialize classes if possible") \
2374 \
2375 develop(bool, TraceMethodReplacement, false, \
2376 "Print when methods are replaced do to recompilation") \
2377 \
2378 develop(bool, PrintMethodFlushing, false, \
2379 "print the nmethods being flushed") \
2380 \
2381 notproduct(bool, LogMultipleMutexLocking, false, \
2382 "log locking and unlocking of mutexes (only if multiple locks " \
2383 "are held)") \
2384 \
2385 develop(bool, UseRelocIndex, false, \
2386 "use an index to speed random access to relocations") \
2387 \
2388 develop(bool, StressCodeBuffers, false, \
2389 "Exercise code buffer expansion and other rare state changes") \
2390 \
2391 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2392 "Generate extra debugging info for non-safepoints in nmethods") \
2393 \
2394 diagnostic(bool, DebugInlinedCalls, true, \
2395 "If false, restricts profiled locations to the root method only") \
2396 \
2397 product(bool, PrintVMOptions, trueInDebug, \
2398 "Print flags that appeared on the command line") \
2399 \
2400 product(bool, IgnoreUnrecognizedVMOptions, false, \
2401 "Ignore unrecognized VM options") \
2402 \
2403 product(bool, PrintCommandLineFlags, false, \
2404 "Print flags specified on command line or set by ergonomics") \
2405 \
2406 product(bool, PrintFlagsInitial, false, \
2407 "Print all VM flags before argument processing and exit VM") \
2408 \
2409 product(bool, PrintFlagsFinal, false, \
2410 "Print all VM flags after argument and ergonomic processing") \
2411 \
2412 notproduct(bool, PrintFlagsWithComments, false, \
2413 "Print all VM flags with default values and descriptions and exit")\
2414 \
2415 diagnostic(bool, SerializeVMOutput, true, \
2416 "Use a mutex to serialize output to tty and hotspot.log") \
2417 \
2418 diagnostic(bool, DisplayVMOutput, true, \
2419 "Display all VM output on the tty, independently of LogVMOutput") \
2420 \
2421 diagnostic(bool, LogVMOutput, trueInDebug, \
2422 "Save VM output to hotspot.log, or to LogFile") \
2423 \
2424 diagnostic(ccstr, LogFile, NULL, \
2425 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2426 \
2427 product(ccstr, ErrorFile, NULL, \
2428 "If an error occurs, save the error data to this file " \
2429 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2430 \
2431 product(bool, DisplayVMOutputToStderr, false, \
2432 "If DisplayVMOutput is true, display all VM output to stderr") \
2433 \
2434 product(bool, DisplayVMOutputToStdout, false, \
2435 "If DisplayVMOutput is true, display all VM output to stdout") \
2436 \
2437 product(bool, UseHeavyMonitors, false, \
2438 "use heavyweight instead of lightweight Java monitors") \
2439 \
2440 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2441 "print histogram of the symbol table") \
2442 \
2443 notproduct(bool, ExitVMOnVerifyError, false, \
2444 "standard exit from VM if bytecode verify error " \
2445 "(only in debug mode)") \
2446 \
2447 notproduct(ccstr, AbortVMOnException, NULL, \
2448 "Call fatal if this exception is thrown. Example: " \
2449 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2450 \
2451 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2452 "Call fatal if the exception pointed by AbortVMOnException " \
2453 "has this message.") \
2454 \
2455 develop(bool, DebugVtables, false, \
2456 "add debugging code to vtable dispatch") \
2457 \
2458 develop(bool, PrintVtables, false, \
2459 "print vtables when printing klass") \
2460 \
2461 notproduct(bool, PrintVtableStats, false, \
2462 "print vtables stats at end of run") \
2463 \
2464 develop(bool, TraceCreateZombies, false, \
2465 "trace creation of zombie nmethods") \
2466 \
2467 notproduct(bool, IgnoreLockingAssertions, false, \
2468 "disable locking assertions (for speed)") \
2469 \
2470 notproduct(bool, VerifyLoopOptimizations, false, \
2471 "verify major loop optimizations") \
2472 \
2473 product(bool, RangeCheckElimination, true, \
2474 "Split loop iterations to eliminate range checks") \
2475 \
2476 develop_pd(bool, UncommonNullCast, \
2477 "track occurrences of null in casts; adjust compiler tactics") \
2478 \
2479 develop(bool, TypeProfileCasts, true, \
2480 "treat casts like calls for purposes of type profiling") \
2481 \
2482 develop(bool, MonomorphicArrayCheck, true, \
2483 "Uncommon-trap array store checks that require full type check") \
2484 \
2485 diagnostic(bool, ProfileDynamicTypes, true, \
2486 "do extra type profiling and use it more aggressively") \
2487 \
2488 develop(bool, DelayCompilationDuringStartup, true, \
2489 "Delay invoking the compiler until main application class is " \
2490 "loaded") \
2491 \
2492 develop(bool, CompileTheWorld, false, \
2493 "Compile all methods in all classes in bootstrap class path " \
2494 "(stress test)") \
2495 \
2496 develop(bool, CompileTheWorldPreloadClasses, true, \
2497 "Preload all classes used by a class before start loading") \
2498 \
2499 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2500 "Compile all methods although class initializer failed") \
2501 \
2502 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2503 "Force a safepoint every n compiles so sweeper can keep up") \
2504 \
2505 develop(bool, TraceIterativeGVN, false, \
2506 "Print progress during Iterative Global Value Numbering") \
2507 \
2508 develop(bool, FillDelaySlots, true, \
2509 "Fill delay slots (on SPARC only)") \
2510 \
2511 develop(bool, VerifyIterativeGVN, false, \
2512 "Verify Def-Use modifications during sparse Iterative Global " \
2513 "Value Numbering") \
2514 \
2515 notproduct(bool, TracePhaseCCP, false, \
2516 "Print progress during Conditional Constant Propagation") \
2517 \
2518 develop(bool, TimeLivenessAnalysis, false, \
2519 "Time computation of bytecode liveness analysis") \
2520 \
2521 develop(bool, TraceLivenessGen, false, \
2522 "Trace the generation of liveness analysis information") \
2523 \
2524 notproduct(bool, TraceLivenessQuery, false, \
2525 "Trace queries of liveness analysis information") \
2526 \
2527 notproduct(bool, CollectIndexSetStatistics, false, \
2528 "Collect information about IndexSets") \
2529 \
2530 develop(bool, PrintDominators, false, \
2531 "Print out dominator trees for GVN") \
2532 \
2533 develop(bool, UseLoopSafepoints, true, \
2534 "Generate Safepoint nodes in every loop") \
2535 \
2536 notproduct(bool, TraceCISCSpill, false, \
2537 "Trace allocators use of cisc spillable instructions") \
2538 \
2539 notproduct(bool, TraceSpilling, false, \
2540 "Trace spilling") \
2541 \
2542 product(bool, SplitIfBlocks, true, \
2543 "Clone compares and control flow through merge points to fold " \
2544 "some branches") \
2545 \
2546 develop(intx, FastAllocateSizeLimit, 128*K, \
2547 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2548 "Inline allocations larger than this in doublewords must go slow")\
2549 \
2550 product(bool, AggressiveOpts, false, \
2551 "Enable aggressive optimizations - see arguments.cpp") \
2552 \
2553 product(bool, UseStringCache, false, \
2554 "Enable String cache capabilities on String.java") \
2555 \
2556 /* statistics */ \
2557 develop(bool, CountCompiledCalls, false, \
2558 "counts method invocations") \
2559 \
2560 notproduct(bool, CountRuntimeCalls, false, \
2561 "counts VM runtime calls") \
2562 \
2563 develop(bool, CountJNICalls, false, \
2564 "counts jni method invocations") \
2565 \
2566 notproduct(bool, CountJVMCalls, false, \
2567 "counts jvm method invocations") \
2568 \
2569 notproduct(bool, CountRemovableExceptions, false, \
2570 "count exceptions that could be replaced by branches due to " \
2571 "inlining") \
2572 \
2573 notproduct(bool, ICMissHistogram, false, \
2574 "produce histogram of IC misses") \
2575 \
2576 notproduct(bool, PrintClassStatistics, false, \
2577 "prints class statistics at end of run") \
2578 \
2579 notproduct(bool, PrintMethodStatistics, false, \
2580 "prints method statistics at end of run") \
2581 \
2582 /* interpreter */ \
2583 develop(bool, ClearInterpreterLocals, false, \
2584 "Always clear local variables of interpreter activations upon " \
2585 "entry") \
2586 \
2587 product_pd(bool, RewriteBytecodes, \
2588 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2589 \
2590 product_pd(bool, RewriteFrequentPairs, \
2591 "Rewrite frequently used bytecode pairs into a single bytecode") \
2592 \
2593 diagnostic(bool, PrintInterpreter, false, \
2594 "Prints the generated interpreter code") \
2595 \
2596 product(bool, UseInterpreter, true, \
2597 "Use interpreter for non-compiled methods") \
2598 \
2599 develop(bool, UseFastSignatureHandlers, true, \
2600 "Use fast signature handlers for native calls") \
2601 \
2602 develop(bool, UseV8InstrsOnly, false, \
2603 "Use SPARC-V8 Compliant instruction subset") \
2604 \
2605 product(bool, UseNiagaraInstrs, false, \
2606 "Use Niagara-efficient instruction subset") \
2607 \
2608 develop(bool, UseCASForSwap, false, \
2609 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2610 \
2611 product(bool, UseLoopCounter, true, \
2612 "Increment invocation counter on backward branch") \
2613 \
2614 product(bool, UseFastEmptyMethods, true, \
2615 "Use fast method entry code for empty methods") \
2616 \
2617 product(bool, UseFastAccessorMethods, true, \
2618 "Use fast method entry code for accessor methods") \
2619 \
2620 product_pd(bool, UseOnStackReplacement, \
2621 "Use on stack replacement, calls runtime if invoc. counter " \
2622 "overflows in loop") \
2623 \
2624 notproduct(bool, TraceOnStackReplacement, false, \
2625 "Trace on stack replacement") \
2626 \
2627 develop(bool, PoisonOSREntry, true, \
2628 "Detect abnormal calls to OSR code") \
2629 \
2630 product_pd(bool, PreferInterpreterNativeStubs, \
2631 "Use always interpreter stubs for native methods invoked via " \
2632 "interpreter") \
2633 \
2634 develop(bool, CountBytecodes, false, \
2635 "Count number of bytecodes executed") \
2636 \
2637 develop(bool, PrintBytecodeHistogram, false, \
2638 "Print histogram of the executed bytecodes") \
2639 \
2640 develop(bool, PrintBytecodePairHistogram, false, \
2641 "Print histogram of the executed bytecode pairs") \
2642 \
2643 diagnostic(bool, PrintSignatureHandlers, false, \
2644 "Print code generated for native method signature handlers") \
2645 \
2646 develop(bool, VerifyOops, false, \
2647 "Do plausibility checks for oops") \
2648 \
2649 develop(bool, CheckUnhandledOops, false, \
2650 "Check for unhandled oops in VM code") \
2651 \
2652 develop(bool, VerifyJNIFields, trueInDebug, \
2653 "Verify jfieldIDs for instance fields") \
2654 \
2655 notproduct(bool, VerifyJNIEnvThread, false, \
2656 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2657 "from JNI") \
2658 \
2659 develop(bool, VerifyFPU, false, \
2660 "Verify FPU state (check for NaN's, etc.)") \
2661 \
2662 develop(bool, VerifyThread, false, \
2663 "Watch the thread register for corruption (SPARC only)") \
2664 \
2665 develop(bool, VerifyActivationFrameSize, false, \
2666 "Verify that activation frame didn't become smaller than its " \
2667 "minimal size") \
2668 \
2669 develop(bool, TraceFrequencyInlining, false, \
2670 "Trace frequency based inlining") \
2671 \
2672 notproduct(bool, TraceTypeProfile, false, \
2673 "Trace type profile") \
2674 \
2675 develop_pd(bool, InlineIntrinsics, \
2676 "Inline intrinsics that can be statically resolved") \
2677 \
2678 product_pd(bool, ProfileInterpreter, \
2679 "Profile at the bytecode level during interpretation") \
2680 \
2681 develop_pd(bool, ProfileTraps, \
2682 "Profile deoptimization traps at the bytecode level") \
2683 \
2684 product(intx, ProfileMaturityPercentage, 20, \
2685 "number of method invocations/branches (expressed as % of " \
2686 "CompileThreshold) before using the method's profile") \
2687 \
2688 develop(bool, PrintMethodData, false, \
2689 "Print the results of +ProfileInterpreter at end of run") \
2690 \
2691 develop(bool, VerifyDataPointer, trueInDebug, \
2692 "Verify the method data pointer during interpreter profiling") \
2693 \
2694 develop(bool, VerifyCompiledCode, false, \
2695 "Include miscellaneous runtime verifications in nmethod code; " \
2696 "default off because it disturbs nmethod size heuristics") \
2697 \
2698 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2699 "Manually make GC thread crash then dump java stack trace; " \
2700 "Test only") \
2701 \
2702 /* compilation */ \
2703 product(bool, UseCompiler, true, \
2704 "use compilation") \
2705 \
2706 develop(bool, TraceCompilationPolicy, false, \
2707 "Trace compilation policy") \
2708 \
2709 develop(bool, TimeCompilationPolicy, false, \
2710 "Time the compilation policy") \
2711 \
2712 product(bool, UseCounterDecay, true, \
2713 "adjust recompilation counters") \
2714 \
2715 develop(intx, CounterHalfLifeTime, 30, \
2716 "half-life time of invocation counters (in secs)") \
2717 \
2718 develop(intx, CounterDecayMinIntervalLength, 500, \
2719 "Min. ms. between invocation of CounterDecay") \
2720 \
2721 product(bool, AlwaysCompileLoopMethods, false, \
2722 "when using recompilation, never interpret methods " \
2723 "containing loops") \
2724 \
2725 product(bool, DontCompileHugeMethods, true, \
2726 "don't compile methods > HugeMethodLimit") \
2727 \
2728 /* Bytecode escape analysis estimation. */ \
2729 product(bool, EstimateArgEscape, true, \
2730 "Analyze bytecodes to estimate escape state of arguments") \
2731 \
2732 product(intx, BCEATraceLevel, 0, \
2733 "How much tracing to do of bytecode escape analysis estimates") \
2734 \
2735 product(intx, MaxBCEAEstimateLevel, 5, \
2736 "Maximum number of nested calls that are analyzed by BC EA.") \
2737 \
2738 product(intx, MaxBCEAEstimateSize, 150, \
2739 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2740 \
2741 product(intx, AllocatePrefetchStyle, 1, \
2742 "0 = no prefetch, " \
2743 "1 = prefetch instructions for each allocation, " \
2744 "2 = use TLAB watermark to gate allocation prefetch, " \
2745 "3 = use BIS instruction on Sparc for allocation prefetch") \
2746 \
2747 product(intx, AllocatePrefetchDistance, -1, \
2748 "Distance to prefetch ahead of allocation pointer") \
2749 \
2750 product(intx, AllocatePrefetchLines, 1, \
2751 "Number of lines to prefetch ahead of allocation pointer") \
2752 \
2753 product(intx, AllocatePrefetchStepSize, 16, \
2754 "Step size in bytes of sequential prefetch instructions") \
2755 \
2756 product(intx, AllocatePrefetchInstr, 0, \
2757 "Prefetch instruction to prefetch ahead of allocation pointer") \
2758 \
2759 product(intx, ReadPrefetchInstr, 0, \
2760 "Prefetch instruction to prefetch ahead") \
2761 \
2762 /* deoptimization */ \
2763 develop(bool, TraceDeoptimization, false, \
2764 "Trace deoptimization") \
2765 \
2766 develop(bool, DebugDeoptimization, false, \
2767 "Tracing various information while debugging deoptimization") \
2768 \
2769 product(intx, SelfDestructTimer, 0, \
2770 "Will cause VM to terminate after a given time (in minutes) " \
2771 "(0 means off)") \
2772 \
2773 product(intx, MaxJavaStackTraceDepth, 1024, \
2774 "Max. no. of lines in the stack trace for Java exceptions " \
2775 "(0 means all)") \
2776 \
2777 develop(intx, GuaranteedSafepointInterval, 1000, \
2778 "Guarantee a safepoint (at least) every so many milliseconds " \
2779 "(0 means none)") \
2780 \
2781 product(intx, SafepointTimeoutDelay, 10000, \
2782 "Delay in milliseconds for option SafepointTimeout") \
2783 \
2784 product(intx, NmethodSweepFraction, 4, \
2785 "Number of invocations of sweeper to cover all nmethods") \
2786 \
2787 product(intx, NmethodSweepCheckInterval, 5, \
2788 "Compilers wake up every n seconds to possibly sweep nmethods") \
2789 \
2790 notproduct(intx, MemProfilingInterval, 500, \
2791 "Time between each invocation of the MemProfiler") \
2792 \
2793 develop(intx, MallocCatchPtr, -1, \
2794 "Hit breakpoint when mallocing/freeing this pointer") \
2795 \
2796 notproduct(intx, AssertRepeat, 1, \
2797 "number of times to evaluate expression in assert " \
2798 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2799 \
2800 notproduct(ccstrlist, SuppressErrorAt, "", \
2801 "List of assertions (file:line) to muzzle") \
2802 \
2803 notproduct(uintx, HandleAllocationLimit, 1024, \
2804 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2805 "is used") \
2806 \
2807 develop(uintx, TotalHandleAllocationLimit, 1024, \
2808 "Threshold for total handle allocation when " \
2809 "+TraceHandleAllocation is used") \
2810 \
2811 develop(intx, StackPrintLimit, 100, \
2812 "number of stack frames to print in VM-level stack dump") \
2813 \
2814 notproduct(intx, MaxElementPrintSize, 256, \
2815 "maximum number of elements to print") \
2816 \
2817 notproduct(intx, MaxSubklassPrintSize, 4, \
2818 "maximum number of subklasses to print when printing klass") \
2819 \
2820 product(intx, MaxInlineLevel, 9, \
2821 "maximum number of nested calls that are inlined") \
2822 \
2823 product(intx, MaxRecursiveInlineLevel, 1, \
2824 "maximum number of nested recursive calls that are inlined") \
2825 \
2826 product_pd(intx, InlineSmallCode, \
2827 "Only inline already compiled methods if their code size is " \
2828 "less than this") \
2829 \
2830 product(intx, MaxInlineSize, 35, \
2831 "maximum bytecode size of a method to be inlined") \
2832 \
2833 product_pd(intx, FreqInlineSize, \
2834 "maximum bytecode size of a frequent method to be inlined") \
2835 \
2836 product(intx, MaxTrivialSize, 6, \
2837 "maximum bytecode size of a trivial method to be inlined") \
2838 \
2839 product(intx, MinInliningThreshold, 250, \
2840 "min. invocation count a method needs to have to be inlined") \
2841 \
2842 develop(intx, AlignEntryCode, 4, \
2843 "aligns entry code to specified value (in bytes)") \
2844 \
2845 develop(intx, MethodHistogramCutoff, 100, \
2846 "cutoff value for method invoc. histogram (+CountCalls)") \
2847 \
2848 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2849 "# of interpreted methods to show in profile") \
2850 \
2851 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2852 "# of compiled methods to show in profile") \
2853 \
2854 develop(intx, ProfilerNumberOfStubMethods, 25, \
2855 "# of stub methods to show in profile") \
2856 \
2857 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2858 "# of runtime stub nodes to show in profile") \
2859 \
2860 product(intx, ProfileIntervalsTicks, 100, \
2861 "# of ticks between printing of interval profile " \
2862 "(+ProfileIntervals)") \
2863 \
2864 notproduct(intx, ScavengeALotInterval, 1, \
2865 "Interval between which scavenge will occur with +ScavengeALot") \
2866 \
2867 notproduct(intx, FullGCALotInterval, 1, \
2868 "Interval between which full gc will occur with +FullGCALot") \
2869 \
2870 notproduct(intx, FullGCALotStart, 0, \
2871 "For which invocation to start FullGCAlot") \
2872 \
2873 notproduct(intx, FullGCALotDummies, 32*K, \
2874 "Dummy object allocated with +FullGCALot, forcing all objects " \
2875 "to move") \
2876 \
2877 develop(intx, DontYieldALotInterval, 10, \
2878 "Interval between which yields will be dropped (milliseconds)") \
2879 \
2880 develop(intx, MinSleepInterval, 1, \
2881 "Minimum sleep() interval (milliseconds) when " \
2882 "ConvertSleepToYield is off (used for SOLARIS)") \
2883 \
2884 product(intx, EventLogLength, 2000, \
2885 "maximum nof events in event log") \
2886 \
2887 develop(intx, ProfilerPCTickThreshold, 15, \
2888 "Number of ticks in a PC buckets to be a hotspot") \
2889 \
2890 notproduct(intx, DeoptimizeALotInterval, 5, \
2891 "Number of exits until DeoptimizeALot kicks in") \
2892 \
2893 notproduct(intx, ZombieALotInterval, 5, \
2894 "Number of exits until ZombieALot kicks in") \
2895 \
2896 develop(bool, StressNonEntrant, false, \
2897 "Mark nmethods non-entrant at registration") \
2898 \
2899 diagnostic(intx, MallocVerifyInterval, 0, \
2900 "if non-zero, verify C heap after every N calls to " \
2901 "malloc/realloc/free") \
2902 \
2903 diagnostic(intx, MallocVerifyStart, 0, \
2904 "if non-zero, start verifying C heap after Nth call to " \
2905 "malloc/realloc/free") \
2906 \
2907 product(intx, TypeProfileWidth, 2, \
2908 "number of receiver types to record in call/cast profile") \
2909 \
2910 develop(intx, BciProfileWidth, 2, \
2911 "number of return bci's to record in ret profile") \
2912 \
2913 product(intx, PerMethodRecompilationCutoff, 400, \
2914 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2915 \
2916 product(intx, PerBytecodeRecompilationCutoff, 200, \
2917 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2918 \
2919 product(intx, PerMethodTrapLimit, 100, \
2920 "Limit on traps (of one kind) in a method (includes inlines)") \
2921 \
2922 product(intx, PerBytecodeTrapLimit, 4, \
2923 "Limit on traps (of one kind) at a particular BCI") \
2924 \
2925 develop(intx, FreqCountInvocations, 1, \
2926 "Scaling factor for branch frequencies (deprecated)") \
2927 \
2928 develop(intx, InlineFrequencyRatio, 20, \
2929 "Ratio of call site execution to caller method invocation") \
2930 \
2931 develop_pd(intx, InlineFrequencyCount, \
2932 "Count of call site execution necessary to trigger frequent " \
2933 "inlining") \
2934 \
2935 develop(intx, InlineThrowCount, 50, \
2936 "Force inlining of interpreted methods that throw this often") \
2937 \
2938 develop(intx, InlineThrowMaxSize, 200, \
2939 "Force inlining of throwing methods smaller than this") \
2940 \
2941 product(intx, AliasLevel, 3, \
2942 "0 for no aliasing, 1 for oop/field/static/array split, " \
2943 "2 for class split, 3 for unique instances") \
2944 \
2945 develop(bool, VerifyAliases, false, \
2946 "perform extra checks on the results of alias analysis") \
2947 \
2948 develop(intx, ProfilerNodeSize, 1024, \
2949 "Size in K to allocate for the Profile Nodes of each thread") \
2950 \
2951 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
2952 "Number of times to spin wait on a v8 atomic operation lock") \
2953 \
2954 product(intx, ReadSpinIterations, 100, \
2955 "Number of read attempts before a yield (spin inner loop)") \
2956 \
2957 product_pd(intx, PreInflateSpin, \
2958 "Number of times to spin wait before inflation") \
2959 \
2960 product(intx, PreBlockSpin, 10, \
2961 "Number of times to spin in an inflated lock before going to " \
2962 "an OS lock") \
2963 \
2964 /* gc parameters */ \
2965 product(uintx, InitialHeapSize, 0, \
2966 "Initial heap size (in bytes); zero means OldSize + NewSize") \
2967 \
2968 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
2969 "Maximum heap size (in bytes)") \
2970 \
2971 product(uintx, OldSize, ScaleForWordSize(4*M), \
2972 "Initial tenured generation size (in bytes)") \
2973 \
2974 product(uintx, NewSize, ScaleForWordSize(1*M), \
2975 "Initial new generation size (in bytes)") \
2976 \
2977 product(uintx, MaxNewSize, max_uintx, \
2978 "Maximum new generation size (in bytes), max_uintx means set " \
2979 "ergonomically") \
2980 \
2981 product(uintx, PretenureSizeThreshold, 0, \
2982 "Maximum size in bytes of objects allocated in DefNew " \
2983 "generation; zero means no maximum") \
2984 \
2985 product(uintx, TLABSize, 0, \
2986 "Starting TLAB size (in bytes); zero means set ergonomically") \
2987 \
2988 product(uintx, MinTLABSize, 2*K, \
2989 "Minimum allowed TLAB size (in bytes)") \
2990 \
2991 product(uintx, TLABAllocationWeight, 35, \
2992 "Allocation averaging weight") \
2993 \
2994 product(uintx, TLABWasteTargetPercent, 1, \
2995 "Percentage of Eden that can be wasted") \
2996 \
2997 product(uintx, TLABRefillWasteFraction, 64, \
2998 "Max TLAB waste at a refill (internal fragmentation)") \
2999 \
3000 product(uintx, TLABWasteIncrement, 4, \
3001 "Increment allowed waste at slow allocation") \
3002 \
3003 product(intx, SurvivorRatio, 8, \
3004 "Ratio of eden/survivor space size") \
3005 \
3006 product(intx, NewRatio, 2, \
3007 "Ratio of new/old generation sizes") \
3008 \
3009 product(uintx, MaxLiveObjectEvacuationRatio, 100, \
3010 "Max percent of eden objects that will be live at scavenge") \
3011 \
3012 product_pd(uintx, NewSizeThreadIncrease, \
3013 "Additional size added to desired new generation size per " \
3014 "non-daemon thread (in bytes)") \
3015 \
3016 product_pd(uintx, PermSize, \
3017 "Initial size of permanent generation (in bytes)") \
3018 \
3019 product_pd(uintx, MaxPermSize, \
3020 "Maximum size of permanent generation (in bytes)") \
3021 \
3022 product(uintx, MinHeapFreeRatio, 40, \
3023 "Min percentage of heap free after GC to avoid expansion") \
3024 \
3025 product(uintx, MaxHeapFreeRatio, 70, \
3026 "Max percentage of heap free after GC to avoid shrinking") \
3027 \
3028 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3029 "Number of milliseconds per MB of free space in the heap") \
3030 \
3031 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3032 "Min change in heap space due to GC (in bytes)") \
3033 \
3034 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
3035 "Min expansion of permanent heap (in bytes)") \
3036 \
3037 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3038 "Max expansion of permanent heap without full GC (in bytes)") \
3039 \
3040 product(intx, QueuedAllocationWarningCount, 0, \
3041 "Number of times an allocation that queues behind a GC " \
3042 "will retry before printing a warning") \
3043 \
3044 diagnostic(uintx, VerifyGCStartAt, 0, \
3045 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3046 \
3047 diagnostic(intx, VerifyGCLevel, 0, \
3048 "Generation level at which to start +VerifyBefore/AfterGC") \
3049 \
3050 develop(uintx, ExitAfterGCNum, 0, \
3051 "If non-zero, exit after this GC.") \
3052 \
3053 product(intx, MaxTenuringThreshold, 15, \
3054 "Maximum value for tenuring threshold") \
3055 \
3056 product(intx, InitialTenuringThreshold, 7, \
3057 "Initial value for tenuring threshold") \
3058 \
3059 product(intx, TargetSurvivorRatio, 50, \
3060 "Desired percentage of survivor space used after scavenge") \
3061 \
3062 product(uintx, MarkSweepDeadRatio, 5, \
3063 "Percentage (0-100) of the old gen allowed as dead wood." \
3064 "Serial mark sweep treats this as both the min and max value." \
3065 "CMS uses this value only if it falls back to mark sweep." \
3066 "Par compact uses a variable scale based on the density of the" \
3067 "generation and treats this as the max value when the heap is" \
3068 "either completely full or completely empty. Par compact also" \
3069 "has a smaller default value; see arguments.cpp.") \
3070 \
3071 product(uintx, PermMarkSweepDeadRatio, 20, \
3072 "Percentage (0-100) of the perm gen allowed as dead wood." \
3073 "See MarkSweepDeadRatio for collector-specific comments.") \
3074 \
3075 product(intx, MarkSweepAlwaysCompactCount, 4, \
3076 "How often should we fully compact the heap (ignoring the dead " \
3077 "space parameters)") \
3078 \
3079 product(intx, PrintCMSStatistics, 0, \
3080 "Statistics for CMS") \
3081 \
3082 product(bool, PrintCMSInitiationStatistics, false, \
3083 "Statistics for initiating a CMS collection") \
3084 \
3085 product(intx, PrintFLSStatistics, 0, \
3086 "Statistics for CMS' FreeListSpace") \
3087 \
3088 product(intx, PrintFLSCensus, 0, \
3089 "Census for CMS' FreeListSpace") \
3090 \
3091 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3092 "Delay in ms between expansion and allocation") \
3093 \
3094 product(intx, DeferThrSuspendLoopCount, 4000, \
3095 "(Unstable) Number of times to iterate in safepoint loop " \
3096 " before blocking VM threads ") \
3097 \
3098 product(intx, DeferPollingPageLoopCount, -1, \
3099 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3100 "before changing safepoint polling page to RO ") \
3101 \
3102 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3103 \
3104 product(bool, PSChunkLargeArrays, true, \
3105 "true: process large arrays in chunks") \
3106 \
3107 product(uintx, GCDrainStackTargetSize, 64, \
3108 "how many entries we'll try to leave on the stack during " \
3109 "parallel GC") \
3110 \
3111 /* stack parameters */ \
3112 product_pd(intx, StackYellowPages, \
3113 "Number of yellow zone (recoverable overflows) pages") \
3114 \
3115 product_pd(intx, StackRedPages, \
3116 "Number of red zone (unrecoverable overflows) pages") \
3117 \
3118 product_pd(intx, StackShadowPages, \
3119 "Number of shadow zone (for overflow checking) pages" \
3120 " this should exceed the depth of the VM and native call stack") \
3121 \
3122 product_pd(intx, ThreadStackSize, \
3123 "Thread Stack Size (in Kbytes)") \
3124 \
3125 product_pd(intx, VMThreadStackSize, \
3126 "Non-Java Thread Stack Size (in Kbytes)") \
3127 \
3128 product_pd(intx, CompilerThreadStackSize, \
3129 "Compiler Thread Stack Size (in Kbytes)") \
3130 \
3131 develop_pd(uintx, JVMInvokeMethodSlack, \
3132 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3133 \
3134 product(uintx, ThreadSafetyMargin, 50*M, \
3135 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3136 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3137 "disable this feature") \
3138 \
3139 /* code cache parameters */ \
3140 develop(uintx, CodeCacheSegmentSize, 64, \
3141 "Code cache segment size (in bytes) - smallest unit of " \
3142 "allocation") \
3143 \
3144 develop_pd(intx, CodeEntryAlignment, \
3145 "Code entry alignment for generated code (in bytes)") \
3146 \
3147 product_pd(intx, OptoLoopAlignment, \
3148 "Align inner loops to zero relative to this modulus") \
3149 \
3150 product_pd(uintx, InitialCodeCacheSize, \
3151 "Initial code cache size (in bytes)") \
3152 \
3153 product_pd(uintx, ReservedCodeCacheSize, \
3154 "Reserved code cache size (in bytes) - maximum code cache size") \
3155 \
3156 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3157 "When less than X space left, we stop compiling.") \
3158 \
3159 product_pd(uintx, CodeCacheExpansionSize, \
3160 "Code cache expansion size (in bytes)") \
3161 \
3162 develop_pd(uintx, CodeCacheMinBlockLength, \
3163 "Minimum number of segments in a code cache block.") \
3164 \
3165 notproduct(bool, ExitOnFullCodeCache, false, \
3166 "Exit the VM if we fill the code cache.") \
3167 \
3168 product(bool, UseCodeCacheFlushing, false, \
3169 "Attempt to clean the code cache before shutting off compiler") \
3170 \
3171 product(intx, MinCodeCacheFlushingInterval, 30, \
3172 "Min number of seconds between code cache cleaning sessions") \
3173 \
3174 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3175 "When less than X space left, start code cache cleaning") \
3176 \
3177 /* interpreter debugging */ \
3178 develop(intx, BinarySwitchThreshold, 5, \
3179 "Minimal number of lookupswitch entries for rewriting to binary " \
3180 "switch") \
3181 \
3182 develop(intx, StopInterpreterAt, 0, \
3183 "Stops interpreter execution at specified bytecode number") \
3184 \
3185 develop(intx, TraceBytecodesAt, 0, \
3186 "Traces bytecodes starting with specified bytecode number") \
3187 \
3188 /* compiler interface */ \
3189 develop(intx, CIStart, 0, \
3190 "the id of the first compilation to permit") \
3191 \
3192 develop(intx, CIStop, -1, \
3193 "the id of the last compilation to permit") \
3194 \
3195 develop(intx, CIStartOSR, 0, \
3196 "the id of the first osr compilation to permit " \
3197 "(CICountOSR must be on)") \
3198 \
3199 develop(intx, CIStopOSR, -1, \
3200 "the id of the last osr compilation to permit " \
3201 "(CICountOSR must be on)") \
3202 \
3203 develop(intx, CIBreakAtOSR, -1, \
3204 "id of osr compilation to break at") \
3205 \
3206 develop(intx, CIBreakAt, -1, \
3207 "id of compilation to break at") \
3208 \
3209 product(ccstrlist, CompileOnly, "", \
3210 "List of methods (pkg/class.name) to restrict compilation to") \
3211 \
3212 product(ccstr, CompileCommandFile, NULL, \
3213 "Read compiler commands from this file [.hotspot_compiler]") \
3214 \
3215 product(ccstrlist, CompileCommand, "", \
3216 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3217 \
3218 product(bool, CICompilerCountPerCPU, false, \
3219 "1 compiler thread for log(N CPUs)") \
3220 \
3221 develop(intx, CIFireOOMAt, -1, \
3222 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3223 "(non-negative value throws OOM after this many CI accesses " \
3224 "in each compile)") \
3225 \
3226 develop(intx, CIFireOOMAtDelay, -1, \
3227 "Wait for this many CI accesses to occur in all compiles before " \
3228 "beginning to throw OutOfMemoryErrors in each compile") \
3229 \
3230 notproduct(bool, CIObjectFactoryVerify, false, \
3231 "enable potentially expensive verification in ciObjectFactory") \
3232 \
3233 /* Priorities */ \
3234 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3235 \
3236 product(intx, ThreadPriorityPolicy, 0, \
3237 "0 : Normal. "\
3238 " VM chooses priorities that are appropriate for normal "\
3239 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3240 " to normal native priority. Java priorities below NORM_PRIORITY"\
3241 " map to lower native priority values. On Windows applications"\
3242 " are allowed to use higher native priorities. However, with "\
3243 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3244 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3245 " interfere with system threads. On Linux thread priorities "\
3246 " are ignored because the OS does not support static priority "\
3247 " in SCHED_OTHER scheduling class which is the only choice for"\
3248 " non-root, non-realtime applications. "\
3249 "1 : Aggressive. "\
3250 " Java thread priorities map over to the entire range of "\
3251 " native thread priorities. Higher Java thread priorities map "\
3252 " to higher native thread priorities. This policy should be "\
3253 " used with care, as sometimes it can cause performance "\
3254 " degradation in the application and/or the entire system. On "\
3255 " Linux this policy requires root privilege.") \
3256 \
3257 product(bool, ThreadPriorityVerbose, false, \
3258 "print priority changes") \
3259 \
3260 product(intx, DefaultThreadPriority, -1, \
3261 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3262 \
3263 product(intx, CompilerThreadPriority, -1, \
3264 "what priority should compiler threads run at (-1 means no change)") \
3265 \
3266 product(intx, VMThreadPriority, -1, \
3267 "what priority should VM threads run at (-1 means no change)") \
3268 \
3269 product(bool, CompilerThreadHintNoPreempt, true, \
3270 "(Solaris only) Give compiler threads an extra quanta") \
3271 \
3272 product(bool, VMThreadHintNoPreempt, false, \
3273 "(Solaris only) Give VM thread an extra quanta") \
3274 \
3275 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3276 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3277 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3278 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3279 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3280 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3281 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3282 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3283 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3284 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3285 \
3286 /* compiler debugging */ \
3287 notproduct(intx, CompileTheWorldStartAt, 1, \
3288 "First class to consider when using +CompileTheWorld") \
3289 \
3290 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3291 "Last class to consider when using +CompileTheWorld") \
3292 \
3293 develop(intx, NewCodeParameter, 0, \
3294 "Testing Only: Create a dedicated integer parameter before " \
3295 "putback") \
3296 \
3297 /* new oopmap storage allocation */ \
3298 develop(intx, MinOopMapAllocation, 8, \
3299 "Minimum number of OopMap entries in an OopMapSet") \
3300 \
3301 /* Background Compilation */ \
3302 develop(intx, LongCompileThreshold, 50, \
3303 "Used with +TraceLongCompiles") \
3304 \
3305 product(intx, StarvationMonitorInterval, 200, \
3306 "Pause between each check in ms") \
3307 \
3308 /* recompilation */ \
3309 product_pd(intx, CompileThreshold, \
3310 "number of interpreted method invocations before (re-)compiling") \
3311 \
3312 product_pd(intx, BackEdgeThreshold, \
3313 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3314 \
3315 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3316 "Interpreter (tier 0) invocation notification frequency.") \
3317 \
3318 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3319 "C1 without MDO (tier 2) invocation notification frequency.") \
3320 \
3321 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3322 "C1 with MDO profiling (tier 3) invocation notification " \
3323 "frequency.") \
3324 \
3325 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3326 "Interpreter (tier 0) invocation notification frequency.") \
3327 \
3328 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3329 "C1 without MDO (tier 2) invocation notification frequency.") \
3330 \
3331 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3332 "C1 with MDO profiling (tier 3) invocation notification " \
3333 "frequency.") \
3334 \
3335 product(intx, Tier2CompileThreshold, 0, \
3336 "threshold at which tier 2 compilation is invoked") \
3337 \
3338 product(intx, Tier2BackEdgeThreshold, 0, \
3339 "Back edge threshold at which tier 2 compilation is invoked") \
3340 \
3341 product(intx, Tier3InvocationThreshold, 200, \
3342 "Compile if number of method invocations crosses this " \
3343 "threshold") \
3344 \
3345 product(intx, Tier3MinInvocationThreshold, 100, \
3346 "Minimum invocation to compile at tier 3") \
3347 \
3348 product(intx, Tier3CompileThreshold, 2000, \
3349 "Threshold at which tier 3 compilation is invoked (invocation " \
3350 "minimum must be satisfied.") \
3351 \
3352 product(intx, Tier3BackEdgeThreshold, 7000, \
3353 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3354 \
3355 product(intx, Tier4InvocationThreshold, 5000, \
3356 "Compile if number of method invocations crosses this " \
3357 "threshold") \
3358 \
3359 product(intx, Tier4MinInvocationThreshold, 600, \
3360 "Minimum invocation to compile at tier 4") \
3361 \
3362 product(intx, Tier4CompileThreshold, 15000, \
3363 "Threshold at which tier 4 compilation is invoked (invocation " \
3364 "minimum must be satisfied.") \
3365 \
3366 product(intx, Tier4BackEdgeThreshold, 40000, \
3367 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3368 \
3369 product(intx, Tier3DelayOn, 5, \
3370 "If C2 queue size grows over this amount per compiler thread " \
3371 "stop compiling at tier 3 and start compiling at tier 2") \
3372 \
3373 product(intx, Tier3DelayOff, 2, \
3374 "If C2 queue size is less than this amount per compiler thread " \
3375 "allow methods compiled at tier 2 transition to tier 3") \
3376 \
3377 product(intx, Tier3LoadFeedback, 5, \
3378 "Tier 3 thresholds will increase twofold when C1 queue size " \
3379 "reaches this amount per compiler thread") \
3380 \
3381 product(intx, Tier4LoadFeedback, 3, \
3382 "Tier 4 thresholds will increase twofold when C2 queue size " \
3383 "reaches this amount per compiler thread") \
3384 \
3385 product(intx, TieredCompileTaskTimeout, 50, \
3386 "Kill compile task if method was not used within " \
3387 "given timeout in milliseconds") \
3388 \
3389 product(intx, TieredStopAtLevel, 4, \
3390 "Stop at given compilation level") \
3391 \
3392 product(intx, Tier0ProfilingStartPercentage, 200, \
3393 "Start profiling in interpreter if the counters exceed tier 3" \
3394 "thresholds by the specified percentage") \
3395 \
3396 product(intx, TieredRateUpdateMinTime, 1, \
3397 "Minimum rate sampling interval (in milliseconds)") \
3398 \
3399 product(intx, TieredRateUpdateMaxTime, 25, \
3400 "Maximum rate sampling interval (in milliseconds)") \
3401 \
3402 product_pd(bool, TieredCompilation, \
3403 "Enable tiered compilation") \
3404 \
3405 product(bool, PrintTieredEvents, false, \
3406 "Print tiered events notifications") \
3407 \
3408 product(bool, StressTieredRuntime, false, \
3409 "Alternate client and server compiler on compile requests") \
3410 \
3411 product_pd(intx, OnStackReplacePercentage, \
3412 "NON_TIERED number of method invocations/branches (expressed as %"\
3413 "of CompileThreshold) before (re-)compiling OSR code") \
3414 \
3415 product(intx, InterpreterProfilePercentage, 33, \
3416 "NON_TIERED number of method invocations/branches (expressed as %"\
3417 "of CompileThreshold) before profiling in the interpreter") \
3418 \
3419 develop(intx, MaxRecompilationSearchLength, 10, \
3420 "max. # frames to inspect searching for recompilee") \
3421 \
3422 develop(intx, MaxInterpretedSearchLength, 3, \
3423 "max. # interp. frames to skip when searching for recompilee") \
3424 \
3425 develop(intx, DesiredMethodLimit, 8000, \
3426 "desired max. method size (in bytecodes) after inlining") \
3427 \
3428 develop(intx, HugeMethodLimit, 8000, \
3429 "don't compile methods larger than this if " \
3430 "+DontCompileHugeMethods") \
3431 \
3432 /* New JDK 1.4 reflection implementation */ \
3433 \
3434 develop(bool, UseNewReflection, true, \
3435 "Temporary flag for transition to reflection based on dynamic " \
3436 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3437 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3438 "changes were needed") \
3439 \
3440 develop(bool, VerifyReflectionBytecodes, false, \
3441 "Force verification of 1.4 reflection bytecodes. Does not work " \
3442 "in situations like that described in 4486457 or for " \
3443 "constructors generated for serialization, so can not be enabled "\
3444 "in product.") \
3445 \
3446 product(bool, ReflectionWrapResolutionErrors, true, \
3447 "Temporary flag for transition to AbstractMethodError wrapped " \
3448 "in InvocationTargetException. See 6531596") \
3449 \
3450 \
3451 develop(intx, FastSuperclassLimit, 8, \
3452 "Depth of hardwired instanceof accelerator array") \
3453 \
3454 /* Properties for Java libraries */ \
3455 \
3456 product(intx, MaxDirectMemorySize, -1, \
3457 "Maximum total size of NIO direct-buffer allocations") \
3458 \
3459 /* temporary developer defined flags */ \
3460 \
3461 diagnostic(bool, UseNewCode, false, \
3462 "Testing Only: Use the new version while testing") \
3463 \
3464 diagnostic(bool, UseNewCode2, false, \
3465 "Testing Only: Use the new version while testing") \
3466 \
3467 diagnostic(bool, UseNewCode3, false, \
3468 "Testing Only: Use the new version while testing") \
3469 \
3470 /* flags for performance data collection */ \
3471 \
3472 product(bool, UsePerfData, true, \
3473 "Flag to disable jvmstat instrumentation for performance testing" \
3474 "and problem isolation purposes.") \
3475 \
3476 product(bool, PerfDataSaveToFile, false, \
3477 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3478 \
3479 product(ccstr, PerfDataSaveFile, NULL, \
3480 "Save PerfData memory to the specified absolute pathname," \
3481 "%p in the file name if present will be replaced by pid") \
3482 \
3483 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3484 "Data sampling interval in milliseconds") \
3485 \
3486 develop(bool, PerfTraceDataCreation, false, \
3487 "Trace creation of Performance Data Entries") \
3488 \
3489 develop(bool, PerfTraceMemOps, false, \
3490 "Trace PerfMemory create/attach/detach calls") \
3491 \
3492 product(bool, PerfDisableSharedMem, false, \
3493 "Store performance data in standard memory") \
3494 \
3495 product(intx, PerfDataMemorySize, 32*K, \
3496 "Size of performance data memory region. Will be rounded " \
3497 "up to a multiple of the native os page size.") \
3498 \
3499 product(intx, PerfMaxStringConstLength, 1024, \
3500 "Maximum PerfStringConstant string length before truncation") \
3501 \
3502 product(bool, PerfAllowAtExitRegistration, false, \
3503 "Allow registration of atexit() methods") \
3504 \
3505 product(bool, PerfBypassFileSystemCheck, false, \
3506 "Bypass Win32 file system criteria checks (Windows Only)") \
3507 \
3508 product(intx, UnguardOnExecutionViolation, 0, \
3509 "Unguard page and retry on no-execute fault (Win32 only)" \
3510 "0=off, 1=conservative, 2=aggressive") \
3511 \
3512 /* Serviceability Support */ \
3513 \
3514 product(bool, ManagementServer, false, \
3515 "Create JMX Management Server") \
3516 \
3517 product(bool, DisableAttachMechanism, false, \
3518 "Disable mechanism that allows tools to attach to this VM") \
3519 \
3520 product(bool, StartAttachListener, false, \
3521 "Always start Attach Listener at VM startup") \
3522 \
3523 manageable(bool, PrintConcurrentLocks, false, \
3524 "Print java.util.concurrent locks in thread dump") \
3525 \
3526 /* Shared spaces */ \
3527 \
3528 product(bool, UseSharedSpaces, true, \
3529 "Use shared spaces in the permanent generation") \
3530 \
3531 product(bool, RequireSharedSpaces, false, \
3532 "Require shared spaces in the permanent generation") \
3533 \
3534 product(bool, ForceSharedSpaces, false, \
3535 "Require shared spaces in the permanent generation") \
3536 \
3537 product(bool, DumpSharedSpaces, false, \
3538 "Special mode: JVM reads a class list, loads classes, builds " \
3539 "shared spaces, and dumps the shared spaces to a file to be " \
3540 "used in future JVM runs.") \
3541 \
3542 product(bool, PrintSharedSpaces, false, \
3543 "Print usage of shared spaces") \
3544 \
3545 product(uintx, SharedDummyBlockSize, 512*M, \
3546 "Size of dummy block used to shift heap addresses (in bytes)") \
3547 \
3548 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \
3549 "Size of read-write space in permanent generation (in bytes)") \
3550 \
3551 product(uintx, SharedReadOnlySize, 10*M, \
3552 "Size of read-only space in permanent generation (in bytes)") \
3553 \
3554 product(uintx, SharedMiscDataSize, 4*M, \
3555 "Size of the shared data area adjacent to the heap (in bytes)") \
3556 \
3557 product(uintx, SharedMiscCodeSize, 4*M, \
3558 "Size of the shared code area adjacent to the heap (in bytes)") \
3559 \
3560 diagnostic(bool, SharedOptimizeColdStart, true, \
3561 "At dump time, order shared objects to achieve better " \
3562 "cold startup time.") \
3563 \
3564 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3565 "Reordering policy for SharedOptimizeColdStart " \
3566 "0=favor classload-time locality, 1=balanced, " \
3567 "2=favor runtime locality") \
3568 \
3569 diagnostic(bool, SharedSkipVerify, false, \
3570 "Skip assert() and verify() which page-in unwanted shared " \
3571 "objects. ") \
3572 \
3573 product(bool, AnonymousClasses, false, \
3574 "support sun.misc.Unsafe.defineAnonymousClass") \
3575 \
3576 experimental(bool, EnableMethodHandles, false, \
3577 "support method handles (true by default under JSR 292)") \
3578 \
3579 diagnostic(intx, MethodHandlePushLimit, 3, \
3580 "number of additional stack slots a method handle may push") \
3581 \
3582 develop(bool, TraceMethodHandles, false, \
3583 "trace internal method handle operations") \
3584 \
3585 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3586 "perform extra checks when constructing method handles") \
3587 \
3588 diagnostic(bool, OptimizeMethodHandles, true, \
3589 "when constructing method handles, try to improve them") \
3590 \
3591 experimental(bool, TrustFinalNonStaticFields, false, \
3592 "trust final non-static declarations for constant folding") \
3593 \
3594 experimental(bool, EnableInvokeDynamic, false, \
3595 "recognize the invokedynamic instruction") \
3596 \
3597 experimental(bool, AllowTransitionalJSR292, true, \
3598 "recognize pre-PFD formats of invokedynamic") \
3599 \
3600 develop(bool, TraceInvokeDynamic, false, \
3601 "trace internal invoke dynamic operations") \
3602 \
3603 diagnostic(bool, PauseAtStartup, false, \
3604 "Causes the VM to pause at startup time and wait for the pause " \
3605 "file to be removed (default: ./vm.paused.<pid>)") \
3606 \
3607 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3608 "The file to create and for whose removal to await when pausing " \
3609 "at startup. (default: ./vm.paused.<pid>)") \
3610 \
3611 product(bool, ExtendedDTraceProbes, false, \
3612 "Enable performance-impacting dtrace probes") \
3613 \
3614 product(bool, DTraceMethodProbes, false, \
3615 "Enable dtrace probes for method-entry and method-exit") \
3616 \
3617 product(bool, DTraceAllocProbes, false, \
3618 "Enable dtrace probes for object allocation") \
3619 \
3620 product(bool, DTraceMonitorProbes, false, \
3621 "Enable dtrace probes for monitor events") \
3622 \
3623 product(bool, RelaxAccessControlCheck, false, \
3624 "Relax the access control checks in the verifier") \
3625 \
3626 diagnostic(bool, PrintDTraceDOF, false, \
3627 "Print the DTrace DOF passed to the system for JSDT probes") \
3628 \
3629 product(bool, UseVMInterruptibleIO, false, \
3630 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3631 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3632 " of this flag is true for JDK 6 and earliers")
3633
3634 /*
3635 * Macros for factoring of globals
3636 */
3637
3638 // Interface macros
3639 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3640 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3641 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3642 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3643 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3644 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3645 #ifdef PRODUCT
3646 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3647 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3648 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3649 #else
3650 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3651 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3652 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3653 #endif
3654 // Special LP64 flags, product only needed for now.
3655 #ifdef _LP64
3656 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3657 #else
3658 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3659 #endif // _LP64
3660
3661 // Implementation macros
3662 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3663 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3664 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3665 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3666 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3667 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3668 #ifdef PRODUCT
3669 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3670 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3671 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3672 #else
3673 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3674 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3675 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3676 #endif
3677 #ifdef _LP64
3678 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3679 #else
3680 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3681 #endif // _LP64
3682
3683 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)
3684
3685 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)