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src/share/vm/runtime/globals.hpp@d28aa69f0959
src/share/vm/runtime/globals.hpp
Mon, 30 Jun 2008 17:04:59 -0700
- author
- ysr
- date
- Mon, 30 Jun 2008 17:04:59 -0700
- changeset 785
- d28aa69f0959
- parent 783
- 69fefd031e6c
- child 786
- fab5f738c515
- permissions
- -rw-r--r--
6618726: Introduce -XX:+UnlockExperimentalVMOptions flag
Summary: experimental() flags will protect features of an experimental nature that are not supported in the regular product build. Made UseG1GC an experimental flag.
Reviewed-by: jmasa, kamg, coleenp
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #if !defined(COMPILER1) && !defined(COMPILER2)
26 define_pd_global(bool, BackgroundCompilation, false);
27 define_pd_global(bool, UseTLAB, false);
28 define_pd_global(bool, CICompileOSR, false);
29 define_pd_global(bool, UseTypeProfile, false);
30 define_pd_global(bool, UseOnStackReplacement, false);
31 define_pd_global(bool, InlineIntrinsics, false);
32 define_pd_global(bool, PreferInterpreterNativeStubs, true);
33 define_pd_global(bool, ProfileInterpreter, false);
34 define_pd_global(bool, ProfileTraps, false);
35 define_pd_global(bool, TieredCompilation, false);
37 define_pd_global(intx, CompileThreshold, 0);
38 define_pd_global(intx, Tier2CompileThreshold, 0);
39 define_pd_global(intx, Tier3CompileThreshold, 0);
40 define_pd_global(intx, Tier4CompileThreshold, 0);
42 define_pd_global(intx, BackEdgeThreshold, 0);
43 define_pd_global(intx, Tier2BackEdgeThreshold, 0);
44 define_pd_global(intx, Tier3BackEdgeThreshold, 0);
45 define_pd_global(intx, Tier4BackEdgeThreshold, 0);
47 define_pd_global(intx, OnStackReplacePercentage, 0);
48 define_pd_global(bool, ResizeTLAB, false);
49 define_pd_global(intx, FreqInlineSize, 0);
50 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
51 define_pd_global(intx, NewRatio, 4);
52 define_pd_global(intx, InlineClassNatives, true);
53 define_pd_global(intx, InlineUnsafeOps, true);
54 define_pd_global(intx, InitialCodeCacheSize, 160*K);
55 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
56 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
57 define_pd_global(intx, CodeCacheMinBlockLength, 1);
58 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
59 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
60 define_pd_global(bool, NeverActAsServerClassMachine, true);
61 define_pd_global(uintx, DefaultMaxRAM, 1*G);
62 #define CI_COMPILER_COUNT 0
63 #else
65 #ifdef COMPILER2
66 #define CI_COMPILER_COUNT 2
67 #else
68 #define CI_COMPILER_COUNT 1
69 #endif // COMPILER2
71 #endif // no compilers
74 // string type aliases used only in this file
75 typedef const char* ccstr;
76 typedef const char* ccstrlist; // represents string arguments which accumulate
78 enum FlagValueOrigin {
79 DEFAULT = 0,
80 COMMAND_LINE = 1,
81 ENVIRON_VAR = 2,
82 CONFIG_FILE = 3,
83 MANAGEMENT = 4,
84 ERGONOMIC = 5,
85 ATTACH_ON_DEMAND = 6,
86 INTERNAL = 99
87 };
89 struct Flag {
90 const char *type;
91 const char *name;
92 void* addr;
93 const char *kind;
94 FlagValueOrigin origin;
96 // points to all Flags static array
97 static Flag *flags;
99 // number of flags
100 static size_t numFlags;
102 static Flag* find_flag(char* name, size_t length);
104 bool is_bool() const { return strcmp(type, "bool") == 0; }
105 bool get_bool() const { return *((bool*) addr); }
106 void set_bool(bool value) { *((bool*) addr) = value; }
108 bool is_intx() const { return strcmp(type, "intx") == 0; }
109 intx get_intx() const { return *((intx*) addr); }
110 void set_intx(intx value) { *((intx*) addr) = value; }
112 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
113 uintx get_uintx() const { return *((uintx*) addr); }
114 void set_uintx(uintx value) { *((uintx*) addr) = value; }
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; }
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; }
125 bool is_unlocker() const;
126 bool is_unlocked() const;
127 bool is_writeable() const;
128 bool is_external() const;
130 void print_on(outputStream* st);
131 void print_as_flag(outputStream* st);
132 };
134 // debug flags control various aspects of the VM and are global accessible
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 };
148 class CounterSetting {
149 intx* counter;
150 public:
151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
152 ~CounterSetting() { (*counter)--; }
153 };
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 };
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 };
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); }
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); }
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); }
191 static bool doubleAt(char* name, size_t len, double* value);
192 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
193 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
194 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
196 static bool ccstrAt(char* name, size_t len, ccstr* value);
197 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
198 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
199 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
201 // Returns false if name is not a command line flag.
202 static bool wasSetOnCmdline(const char* name, bool* value);
203 static void printSetFlags();
205 static void printFlags() PRODUCT_RETURN;
207 static void verify() PRODUCT_RETURN;
208 };
210 // use this for flags that are true by default in the debug version but
211 // false in the optimized version, and vice versa
212 #ifdef ASSERT
213 #define trueInDebug true
214 #define falseInDebug false
215 #else
216 #define trueInDebug false
217 #define falseInDebug true
218 #endif
220 // use this for flags that are true per default in the product build
221 // but false in development builds, and vice versa
222 #ifdef PRODUCT
223 #define trueInProduct true
224 #define falseInProduct false
225 #else
226 #define trueInProduct false
227 #define falseInProduct true
228 #endif
230 // use this for flags that are true per default in the tiered build
231 // but false in non-tiered builds, and vice versa
232 #ifdef TIERED
233 #define trueInTiered true
234 #define falseInTiered false
235 #else
236 #define trueInTiered false
237 #define falseInTiered true
238 #endif
240 // develop flags are settable / visible only during development and are constant in the PRODUCT version
241 // product flags are always settable / visible
242 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
244 // A flag must be declared with one of the following types:
245 // bool, intx, uintx, ccstr.
246 // The type "ccstr" is an alias for "const char*" and is used
247 // only in this file, because the macrology requires single-token type names.
249 // Note: Diagnostic options not meant for VM tuning or for product modes.
250 // They are to be used for VM quality assurance or field diagnosis
251 // of VM bugs. They are hidden so that users will not be encouraged to
252 // try them as if they were VM ordinary execution options. However, they
253 // are available in the product version of the VM. Under instruction
254 // from support engineers, VM customers can turn them on to collect
255 // diagnostic information about VM problems. To use a VM diagnostic
256 // option, you must first specify +UnlockDiagnosticVMOptions.
257 // (This master switch also affects the behavior of -Xprintflags.)
258 //
259 // experimental flags are in support of features that are not
260 // part of the officially supported product, but are available
261 // for experimenting with. They could, for example, be performance
262 // features that may not have undergone full or rigorous QA, but which may
263 // help performance in some cases and released for experimentation
264 // by the community of users and developers. This flag also allows one to
265 // be able to build a fully supported product that nonetheless also
266 // ships with some unsupported, lightly tested, experimental features.
267 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
268 // UnlockExperimentalVMOptions flag, which allows the control and
269 // modification of the experimental flags.
270 //
271 // manageable flags are writeable external product flags.
272 // They are dynamically writeable through the JDK management interface
273 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
274 // These flags are external exported interface (see CCC). The list of
275 // manageable flags can be queried programmatically through the management
276 // interface.
277 //
278 // A flag can be made as "manageable" only if
279 // - the flag is defined in a CCC as an external exported interface.
280 // - the VM implementation supports dynamic setting of the flag.
281 // This implies that the VM must *always* query the flag variable
282 // and not reuse state related to the flag state at any given time.
283 // - you want the flag to be queried programmatically by the customers.
284 //
285 // product_rw flags are writeable internal product flags.
286 // They are like "manageable" flags but for internal/private use.
287 // The list of product_rw flags are internal/private flags which
288 // may be changed/removed in a future release. It can be set
289 // through the management interface to get/set value
290 // when the name of flag is supplied.
291 //
292 // A flag can be made as "product_rw" only if
293 // - the VM implementation supports dynamic setting of the flag.
294 // This implies that the VM must *always* query the flag variable
295 // and not reuse state related to the flag state at any given time.
296 //
297 // Note that when there is a need to support develop flags to be writeable,
298 // it can be done in the same way as product_rw.
300 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
301 \
302 lp64_product(bool, UseCompressedOops, false, \
303 "Use 32-bit object references in 64-bit VM. " \
304 "lp64_product means flag is always constant in 32 bit VM") \
305 \
306 lp64_product(bool, CheckCompressedOops, trueInDebug, \
307 "generate checks in encoding/decoding code") \
308 \
309 /* UseMembar is theoretically a temp flag used for memory barrier \
310 * removal testing. It was supposed to be removed before FCS but has \
311 * been re-added (see 6401008) */ \
312 product(bool, UseMembar, false, \
313 "(Unstable) Issues membars on thread state transitions") \
314 \
315 product(bool, PrintCommandLineFlags, false, \
316 "Prints flags that appeared on the command line") \
317 \
318 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
319 "Enable normal processing of flags relating to field diagnostics")\
320 \
321 experimental(bool, UnlockExperimentalVMOptions, false, \
322 "Enable normal processing of flags relating to experimental features")\
323 \
324 product(bool, JavaMonitorsInStackTrace, true, \
325 "Print info. about Java monitor locks when the stacks are dumped")\
326 \
327 product_pd(bool, UseLargePages, \
328 "Use large page memory") \
329 \
330 develop(bool, TracePageSizes, false, \
331 "Trace page size selection and usage.") \
332 \
333 product(bool, UseNUMA, false, \
334 "Use NUMA if available") \
335 \
336 product(intx, NUMAChunkResizeWeight, 20, \
337 "Percentage (0-100) used to weight the current sample when " \
338 "computing exponentially decaying average for " \
339 "AdaptiveNUMAChunkSizing") \
340 \
341 product(intx, NUMASpaceResizeRate, 1*G, \
342 "Do not reallocate more that this amount per collection") \
343 \
344 product(bool, UseAdaptiveNUMAChunkSizing, true, \
345 "Enable adaptive chunk sizing for NUMA") \
346 \
347 product(bool, NUMAStats, false, \
348 "Print NUMA stats in detailed heap information") \
349 \
350 product(intx, NUMAPageScanRate, 256, \
351 "Maximum number of pages to include in the page scan procedure") \
352 \
353 product_pd(bool, NeedsDeoptSuspend, \
354 "True for register window machines (sparc/ia64)") \
355 \
356 product(intx, UseSSE, 99, \
357 "Highest supported SSE instructions set on x86/x64") \
358 \
359 product(uintx, LargePageSizeInBytes, 0, \
360 "Large page size (0 to let VM choose the page size") \
361 \
362 product(uintx, LargePageHeapSizeThreshold, 128*M, \
363 "Use large pages if max heap is at least this big") \
364 \
365 product(bool, ForceTimeHighResolution, false, \
366 "Using high time resolution(For Win32 only)") \
367 \
368 develop(bool, TraceItables, false, \
369 "Trace initialization and use of itables") \
370 \
371 develop(bool, TracePcPatching, false, \
372 "Trace usage of frame::patch_pc") \
373 \
374 develop(bool, TraceJumps, false, \
375 "Trace assembly jumps in thread ring buffer") \
376 \
377 develop(bool, TraceRelocator, false, \
378 "Trace the bytecode relocator") \
379 \
380 develop(bool, TraceLongCompiles, false, \
381 "Print out every time compilation is longer than " \
382 "a given threashold") \
383 \
384 develop(bool, SafepointALot, false, \
385 "Generates a lot of safepoints. Works with " \
386 "GuaranteedSafepointInterval") \
387 \
388 product_pd(bool, BackgroundCompilation, \
389 "A thread requesting compilation is not blocked during " \
390 "compilation") \
391 \
392 product(bool, PrintVMQWaitTime, false, \
393 "Prints out the waiting time in VM operation queue") \
394 \
395 develop(bool, BailoutToInterpreterForThrows, false, \
396 "Compiled methods which throws/catches exceptions will be " \
397 "deopt and intp.") \
398 \
399 develop(bool, NoYieldsInMicrolock, false, \
400 "Disable yields in microlock") \
401 \
402 develop(bool, TraceOopMapGeneration, false, \
403 "Shows oopmap generation") \
404 \
405 product(bool, MethodFlushing, true, \
406 "Reclamation of zombie and not-entrant methods") \
407 \
408 develop(bool, VerifyStack, false, \
409 "Verify stack of each thread when it is entering a runtime call") \
410 \
411 develop(bool, ForceUnreachable, false, \
412 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
413 \
414 notproduct(bool, StressDerivedPointers, false, \
415 "Force scavenge when a derived pointers is detected on stack " \
416 "after rtm call") \
417 \
418 develop(bool, TraceDerivedPointers, false, \
419 "Trace traversal of derived pointers on stack") \
420 \
421 notproduct(bool, TraceCodeBlobStacks, false, \
422 "Trace stack-walk of codeblobs") \
423 \
424 product(bool, PrintJNIResolving, false, \
425 "Used to implement -v:jni") \
426 \
427 notproduct(bool, PrintRewrites, false, \
428 "Print methods that are being rewritten") \
429 \
430 product(bool, UseInlineCaches, true, \
431 "Use Inline Caches for virtual calls ") \
432 \
433 develop(bool, InlineArrayCopy, true, \
434 "inline arraycopy native that is known to be part of " \
435 "base library DLL") \
436 \
437 develop(bool, InlineObjectHash, true, \
438 "inline Object::hashCode() native that is known to be part " \
439 "of base library DLL") \
440 \
441 develop(bool, InlineObjectCopy, true, \
442 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
443 \
444 develop(bool, InlineNatives, true, \
445 "inline natives that are known to be part of base library DLL") \
446 \
447 develop(bool, InlineMathNatives, true, \
448 "inline SinD, CosD, etc.") \
449 \
450 develop(bool, InlineClassNatives, true, \
451 "inline Class.isInstance, etc") \
452 \
453 develop(bool, InlineAtomicLong, true, \
454 "inline sun.misc.AtomicLong") \
455 \
456 develop(bool, InlineThreadNatives, true, \
457 "inline Thread.currentThread, etc") \
458 \
459 develop(bool, InlineReflectionGetCallerClass, true, \
460 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
461 "of base library DLL") \
462 \
463 develop(bool, InlineUnsafeOps, true, \
464 "inline memory ops (native methods) from sun.misc.Unsafe") \
465 \
466 develop(bool, ConvertCmpD2CmpF, true, \
467 "Convert cmpD to cmpF when one input is constant in float range") \
468 \
469 develop(bool, ConvertFloat2IntClipping, true, \
470 "Convert float2int clipping idiom to integer clipping") \
471 \
472 develop(bool, SpecialStringCompareTo, true, \
473 "special version of string compareTo") \
474 \
475 develop(bool, SpecialStringIndexOf, true, \
476 "special version of string indexOf") \
477 \
478 product(bool, SpecialArraysEquals, false, \
479 "special version of Arrays.equals(char[],char[])") \
480 \
481 develop(bool, TraceCallFixup, false, \
482 "traces all call fixups") \
483 \
484 develop(bool, DeoptimizeALot, false, \
485 "deoptimize at every exit from the runtime system") \
486 \
487 develop(ccstrlist, DeoptimizeOnlyAt, "", \
488 "a comma separated list of bcis to deoptimize at") \
489 \
490 product(bool, DeoptimizeRandom, false, \
491 "deoptimize random frames on random exit from the runtime system")\
492 \
493 notproduct(bool, ZombieALot, false, \
494 "creates zombies (non-entrant) at exit from the runt. system") \
495 \
496 notproduct(bool, WalkStackALot, false, \
497 "trace stack (no print) at every exit from the runtime system") \
498 \
499 develop(bool, Debugging, false, \
500 "set when executing debug methods in debug.ccp " \
501 "(to prevent triggering assertions)") \
502 \
503 notproduct(bool, StrictSafepointChecks, trueInDebug, \
504 "Enable strict checks that safepoints cannot happen for threads " \
505 "that used No_Safepoint_Verifier") \
506 \
507 notproduct(bool, VerifyLastFrame, false, \
508 "Verify oops on last frame on entry to VM") \
509 \
510 develop(bool, TraceHandleAllocation, false, \
511 "Prints out warnings when suspicious many handles are allocated") \
512 \
513 product(bool, UseCompilerSafepoints, true, \
514 "Stop at safepoints in compiled code") \
515 \
516 product(bool, UseSplitVerifier, true, \
517 "use split verifier with StackMapTable attributes") \
518 \
519 product(bool, FailOverToOldVerifier, true, \
520 "fail over to old verifier when split verifier fails") \
521 \
522 develop(bool, ShowSafepointMsgs, false, \
523 "Show msg. about safepoint synch.") \
524 \
525 product(bool, SafepointTimeout, false, \
526 "Time out and warn or fail after SafepointTimeoutDelay " \
527 "milliseconds if failed to reach safepoint") \
528 \
529 develop(bool, DieOnSafepointTimeout, false, \
530 "Die upon failure to reach safepoint (see SafepointTimeout)") \
531 \
532 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
533 /* typically, at most a few retries are needed */ \
534 product(intx, SuspendRetryCount, 50, \
535 "Maximum retry count for an external suspend request") \
536 \
537 product(intx, SuspendRetryDelay, 5, \
538 "Milliseconds to delay per retry (* current_retry_count)") \
539 \
540 product(bool, AssertOnSuspendWaitFailure, false, \
541 "Assert/Guarantee on external suspend wait failure") \
542 \
543 product(bool, TraceSuspendWaitFailures, false, \
544 "Trace external suspend wait failures") \
545 \
546 product(bool, MaxFDLimit, true, \
547 "Bump the number of file descriptors to max in solaris.") \
548 \
549 notproduct(bool, LogEvents, trueInDebug, \
550 "Enable Event log") \
551 \
552 product(bool, BytecodeVerificationRemote, true, \
553 "Enables the Java bytecode verifier for remote classes") \
554 \
555 product(bool, BytecodeVerificationLocal, false, \
556 "Enables the Java bytecode verifier for local classes") \
557 \
558 develop(bool, ForceFloatExceptions, trueInDebug, \
559 "Force exceptions on FP stack under/overflow") \
560 \
561 develop(bool, SoftMatchFailure, trueInProduct, \
562 "If the DFA fails to match a node, print a message and bail out") \
563 \
564 develop(bool, VerifyStackAtCalls, false, \
565 "Verify that the stack pointer is unchanged after calls") \
566 \
567 develop(bool, TraceJavaAssertions, false, \
568 "Trace java language assertions") \
569 \
570 notproduct(bool, CheckAssertionStatusDirectives, false, \
571 "temporary - see javaClasses.cpp") \
572 \
573 notproduct(bool, PrintMallocFree, false, \
574 "Trace calls to C heap malloc/free allocation") \
575 \
576 notproduct(bool, PrintOopAddress, false, \
577 "Always print the location of the oop") \
578 \
579 notproduct(bool, VerifyCodeCacheOften, false, \
580 "Verify compiled-code cache often") \
581 \
582 develop(bool, ZapDeadCompiledLocals, false, \
583 "Zap dead locals in compiler frames") \
584 \
585 notproduct(bool, ZapDeadLocalsOld, false, \
586 "Zap dead locals (old version, zaps all frames when " \
587 "entering the VM") \
588 \
589 notproduct(bool, CheckOopishValues, false, \
590 "Warn if value contains oop ( requires ZapDeadLocals)") \
591 \
592 develop(bool, UseMallocOnly, false, \
593 "use only malloc/free for allocation (no resource area/arena)") \
594 \
595 develop(bool, PrintMalloc, false, \
596 "print all malloc/free calls") \
597 \
598 develop(bool, ZapResourceArea, trueInDebug, \
599 "Zap freed resource/arena space with 0xABABABAB") \
600 \
601 notproduct(bool, ZapVMHandleArea, trueInDebug, \
602 "Zap freed VM handle space with 0xBCBCBCBC") \
603 \
604 develop(bool, ZapJNIHandleArea, trueInDebug, \
605 "Zap freed JNI handle space with 0xFEFEFEFE") \
606 \
607 develop(bool, ZapUnusedHeapArea, false, \
608 "Zap unused heap space with 0xBAADBABE") \
609 \
610 develop(bool, PrintVMMessages, true, \
611 "Print vm messages on console") \
612 \
613 product(bool, PrintGCApplicationConcurrentTime, false, \
614 "Print the time the application has been running") \
615 \
616 product(bool, PrintGCApplicationStoppedTime, false, \
617 "Print the time the application has been stopped") \
618 \
619 develop(bool, Verbose, false, \
620 "Prints additional debugging information from other modes") \
621 \
622 develop(bool, PrintMiscellaneous, false, \
623 "Prints uncategorized debugging information (requires +Verbose)") \
624 \
625 develop(bool, WizardMode, false, \
626 "Prints much more debugging information") \
627 \
628 product(bool, ShowMessageBoxOnError, false, \
629 "Keep process alive on VM fatal error") \
630 \
631 product_pd(bool, UseOSErrorReporting, \
632 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
633 \
634 product(bool, SuppressFatalErrorMessage, false, \
635 "Do NO Fatal Error report [Avoid deadlock]") \
636 \
637 product(ccstrlist, OnError, "", \
638 "Run user-defined commands on fatal error; see VMError.cpp " \
639 "for examples") \
640 \
641 product(ccstrlist, OnOutOfMemoryError, "", \
642 "Run user-defined commands on first java.lang.OutOfMemoryError") \
643 \
644 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
645 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
646 \
647 manageable(ccstr, HeapDumpPath, NULL, \
648 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
649 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
650 "in the working directory)") \
651 \
652 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
653 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
654 "when the heap usage is larger than this") \
655 \
656 develop(uintx, HeapDumpSegmentSize, 1*G, \
657 "Approximate segment size when generating a segmented heap dump") \
658 \
659 develop(bool, BreakAtWarning, false, \
660 "Execute breakpoint upon encountering VM warning") \
661 \
662 product_pd(bool, UseVectoredExceptions, \
663 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
664 \
665 develop(bool, TraceVMOperation, false, \
666 "Trace vm operations") \
667 \
668 develop(bool, UseFakeTimers, false, \
669 "Tells whether the VM should use system time or a fake timer") \
670 \
671 diagnostic(bool, LogCompilation, false, \
672 "Log compilation activity in detail to hotspot.log or LogFile") \
673 \
674 product(bool, PrintCompilation, false, \
675 "Print compilations") \
676 \
677 diagnostic(bool, TraceNMethodInstalls, false, \
678 "Trace nmethod intallation") \
679 \
680 diagnostic(bool, TraceOSRBreakpoint, false, \
681 "Trace OSR Breakpoint ") \
682 \
683 diagnostic(bool, TraceCompileTriggered, false, \
684 "Trace compile triggered") \
685 \
686 diagnostic(bool, TraceTriggers, false, \
687 "Trace triggers") \
688 \
689 product(bool, AlwaysRestoreFPU, false, \
690 "Restore the FPU control word after every JNI call (expensive)") \
691 \
692 notproduct(bool, PrintCompilation2, false, \
693 "Print additional statistics per compilation") \
694 \
695 diagnostic(bool, PrintAdapterHandlers, false, \
696 "Print code generated for i2c/c2i adapters") \
697 \
698 diagnostic(bool, PrintAssembly, false, \
699 "Print assembly code (using external disassembler.so)") \
700 \
701 diagnostic(ccstr, PrintAssemblyOptions, false, \
702 "Options string passed to disassembler.so") \
703 \
704 diagnostic(bool, PrintNMethods, false, \
705 "Print assembly code for nmethods when generated") \
706 \
707 diagnostic(bool, PrintNativeNMethods, false, \
708 "Print assembly code for native nmethods when generated") \
709 \
710 develop(bool, PrintDebugInfo, false, \
711 "Print debug information for all nmethods when generated") \
712 \
713 develop(bool, PrintRelocations, false, \
714 "Print relocation information for all nmethods when generated") \
715 \
716 develop(bool, PrintDependencies, false, \
717 "Print dependency information for all nmethods when generated") \
718 \
719 develop(bool, PrintExceptionHandlers, false, \
720 "Print exception handler tables for all nmethods when generated") \
721 \
722 develop(bool, InterceptOSException, false, \
723 "Starts debugger when an implicit OS (e.g., NULL) " \
724 "exception happens") \
725 \
726 notproduct(bool, PrintCodeCache, false, \
727 "Print the compiled_code cache when exiting") \
728 \
729 develop(bool, PrintCodeCache2, false, \
730 "Print detailed info on the compiled_code cache when exiting") \
731 \
732 diagnostic(bool, PrintStubCode, false, \
733 "Print generated stub code") \
734 \
735 product(bool, StackTraceInThrowable, true, \
736 "Collect backtrace in throwable when exception happens") \
737 \
738 product(bool, OmitStackTraceInFastThrow, true, \
739 "Omit backtraces for some 'hot' exceptions in optimized code") \
740 \
741 product(bool, ProfilerPrintByteCodeStatistics, false, \
742 "Prints byte code statictics when dumping profiler output") \
743 \
744 product(bool, ProfilerRecordPC, false, \
745 "Collects tick for each 16 byte interval of compiled code") \
746 \
747 product(bool, ProfileVM, false, \
748 "Profiles ticks that fall within VM (either in the VM Thread " \
749 "or VM code called through stubs)") \
750 \
751 product(bool, ProfileIntervals, false, \
752 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
753 \
754 notproduct(bool, ProfilerCheckIntervals, false, \
755 "Collect and print info on spacing of profiler ticks") \
756 \
757 develop(bool, PrintJVMWarnings, false, \
758 "Prints warnings for unimplemented JVM functions") \
759 \
760 notproduct(uintx, WarnOnStalledSpinLock, 0, \
761 "Prints warnings for stalled SpinLocks") \
762 \
763 develop(bool, InitializeJavaLangSystem, true, \
764 "Initialize java.lang.System - turn off for individual " \
765 "method debugging") \
766 \
767 develop(bool, InitializeJavaLangString, true, \
768 "Initialize java.lang.String - turn off for individual " \
769 "method debugging") \
770 \
771 develop(bool, InitializeJavaLangExceptionsErrors, true, \
772 "Initialize various error and exception classes - turn off for " \
773 "individual method debugging") \
774 \
775 product(bool, RegisterFinalizersAtInit, true, \
776 "Register finalizable objects at end of Object.<init> or " \
777 "after allocation.") \
778 \
779 develop(bool, RegisterReferences, true, \
780 "Tells whether the VM should register soft/weak/final/phantom " \
781 "references") \
782 \
783 develop(bool, IgnoreRewrites, false, \
784 "Supress rewrites of bytecodes in the oopmap generator. " \
785 "This is unsafe!") \
786 \
787 develop(bool, PrintCodeCacheExtension, false, \
788 "Print extension of code cache") \
789 \
790 develop(bool, UsePrivilegedStack, true, \
791 "Enable the security JVM functions") \
792 \
793 develop(bool, IEEEPrecision, true, \
794 "Enables IEEE precision (for INTEL only)") \
795 \
796 develop(bool, ProtectionDomainVerification, true, \
797 "Verifies protection domain before resolution in system " \
798 "dictionary") \
799 \
800 product(bool, ClassUnloading, true, \
801 "Do unloading of classes") \
802 \
803 diagnostic(bool, LinkWellKnownClasses, true, \
804 "Resolve a well known class as soon as its name is seen") \
805 \
806 develop(bool, DisableStartThread, false, \
807 "Disable starting of additional Java threads " \
808 "(for debugging only)") \
809 \
810 develop(bool, MemProfiling, false, \
811 "Write memory usage profiling to log file") \
812 \
813 notproduct(bool, PrintSystemDictionaryAtExit, false, \
814 "Prints the system dictionary at exit") \
815 \
816 diagnostic(bool, UnsyncloadClass, false, \
817 "Unstable: VM calls loadClass unsynchronized. Custom classloader "\
818 "must call VM synchronized for findClass & defineClass") \
819 \
820 product_pd(bool, DontYieldALot, \
821 "Throw away obvious excess yield calls (for SOLARIS only)") \
822 \
823 product_pd(bool, ConvertSleepToYield, \
824 "Converts sleep(0) to thread yield " \
825 "(may be off for SOLARIS to improve GUI)") \
826 \
827 product(bool, ConvertYieldToSleep, false, \
828 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
829 "behavior (SOLARIS only)") \
830 \
831 product(bool, UseBoundThreads, true, \
832 "Bind user level threads to kernel threads (for SOLARIS only)") \
833 \
834 develop(bool, UseDetachedThreads, true, \
835 "Use detached threads that are recycled upon termination " \
836 "(for SOLARIS only)") \
837 \
838 product(bool, UseLWPSynchronization, true, \
839 "Use LWP-based instead of libthread-based synchronization " \
840 "(SPARC only)") \
841 \
842 product(ccstr, SyncKnobs, "", \
843 "(Unstable) Various monitor synchronization tunables") \
844 \
845 product(intx, EmitSync, 0, \
846 "(Unsafe,Unstable) " \
847 " Controls emission of inline sync fast-path code") \
848 \
849 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
850 \
851 product(intx, Atomics, 0, \
852 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
853 \
854 product(intx, FenceInstruction, 0, \
855 "(Unsafe,Unstable) Experimental") \
856 \
857 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
858 \
859 product(intx, SyncVerbose, 0, "(Unstable)" ) \
860 \
861 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
862 \
863 product(intx, hashCode, 0, \
864 "(Unstable) select hashCode generation algorithm" ) \
865 \
866 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
867 "(Unstable, Linux-specific)" \
868 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
869 \
870 product(bool, FilterSpuriousWakeups , true, \
871 "Prevent spurious or premature wakeups from object.wait" \
872 "(Solaris only)") \
873 \
874 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
875 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
876 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
877 \
878 develop(bool, UsePthreads, false, \
879 "Use pthread-based instead of libthread-based synchronization " \
880 "(SPARC only)") \
881 \
882 product(bool, AdjustConcurrency, false, \
883 "call thr_setconcurrency at thread create time to avoid " \
884 "LWP starvation on MP systems (For Solaris Only)") \
885 \
886 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
887 "Should the system attempt to update the compiler file when " \
888 "an error occurs?") \
889 \
890 product(bool, ReduceSignalUsage, false, \
891 "Reduce the use of OS signals in Java and/or the VM") \
892 \
893 notproduct(bool, ValidateMarkSweep, false, \
894 "Do extra validation during MarkSweep collection") \
895 \
896 notproduct(bool, RecordMarkSweepCompaction, false, \
897 "Enable GC-to-GC recording and querying of compaction during " \
898 "MarkSweep") \
899 \
900 develop_pd(bool, ShareVtableStubs, \
901 "Share vtable stubs (smaller code but worse branch prediction") \
902 \
903 develop(bool, LoadLineNumberTables, true, \
904 "Tells whether the class file parser loads line number tables") \
905 \
906 develop(bool, LoadLocalVariableTables, true, \
907 "Tells whether the class file parser loads local variable tables")\
908 \
909 develop(bool, LoadLocalVariableTypeTables, true, \
910 "Tells whether the class file parser loads local variable type tables")\
911 \
912 product(bool, AllowUserSignalHandlers, false, \
913 "Do not complain if the application installs signal handlers " \
914 "(Solaris & Linux only)") \
915 \
916 product(bool, UseSignalChaining, true, \
917 "Use signal-chaining to invoke signal handlers installed " \
918 "by the application (Solaris & Linux only)") \
919 \
920 product(bool, UseAltSigs, false, \
921 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
922 "internal signals. (Solaris only)") \
923 \
924 product(bool, UseSpinning, false, \
925 "Use spinning in monitor inflation and before entry") \
926 \
927 product(bool, PreSpinYield, false, \
928 "Yield before inner spinning loop") \
929 \
930 product(bool, PostSpinYield, true, \
931 "Yield after inner spinning loop") \
932 \
933 product(bool, AllowJNIEnvProxy, false, \
934 "Allow JNIEnv proxies for jdbx") \
935 \
936 product(bool, JNIDetachReleasesMonitors, true, \
937 "JNI DetachCurrentThread releases monitors owned by thread") \
938 \
939 product(bool, RestoreMXCSROnJNICalls, false, \
940 "Restore MXCSR when returning from JNI calls") \
941 \
942 product(bool, CheckJNICalls, false, \
943 "Verify all arguments to JNI calls") \
944 \
945 product(bool, UseFastJNIAccessors, true, \
946 "Use optimized versions of Get<Primitive>Field") \
947 \
948 product(bool, EagerXrunInit, false, \
949 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
950 " but not all -Xrun libraries may support the state of the VM at this time") \
951 \
952 product(bool, PreserveAllAnnotations, false, \
953 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
954 \
955 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
956 "Number of OutOfMemoryErrors preallocated with backtrace") \
957 \
958 product(bool, LazyBootClassLoader, true, \
959 "Enable/disable lazy opening of boot class path entries") \
960 \
961 diagnostic(bool, UseIncDec, true, \
962 "Use INC, DEC instructions on x86") \
963 \
964 product(bool, UseStoreImmI16, true, \
965 "Use store immediate 16-bits value instruction on x86") \
966 \
967 product(bool, UseAddressNop, false, \
968 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
969 \
970 product(bool, UseXmmLoadAndClearUpper, true, \
971 "Load low part of XMM register and clear upper part") \
972 \
973 product(bool, UseXmmRegToRegMoveAll, false, \
974 "Copy all XMM register bits when moving value between registers") \
975 \
976 product(bool, UseXmmI2D, false, \
977 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
978 \
979 product(bool, UseXmmI2F, false, \
980 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
981 \
982 product(intx, FieldsAllocationStyle, 1, \
983 "0 - type based with oops first, 1 - with oops last") \
984 \
985 product(bool, CompactFields, true, \
986 "Allocate nonstatic fields in gaps between previous fields") \
987 \
988 notproduct(bool, PrintCompactFieldsSavings, false, \
989 "Print how many words were saved with CompactFields") \
990 \
991 product(bool, UseBiasedLocking, true, \
992 "Enable biased locking in JVM") \
993 \
994 product(intx, BiasedLockingStartupDelay, 4000, \
995 "Number of milliseconds to wait before enabling biased locking") \
996 \
997 diagnostic(bool, PrintBiasedLockingStatistics, false, \
998 "Print statistics of biased locking in JVM") \
999 \
1000 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1001 "Threshold of number of revocations per type to try to " \
1002 "rebias all objects in the heap of that type") \
1003 \
1004 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1005 "Threshold of number of revocations per type to permanently " \
1006 "revoke biases of all objects in the heap of that type") \
1007 \
1008 product(intx, BiasedLockingDecayTime, 25000, \
1009 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1010 "type after previous bulk rebias") \
1011 \
1012 /* tracing */ \
1013 \
1014 notproduct(bool, TraceRuntimeCalls, false, \
1015 "Trace run-time calls") \
1016 \
1017 develop(bool, TraceJNICalls, false, \
1018 "Trace JNI calls") \
1019 \
1020 notproduct(bool, TraceJVMCalls, false, \
1021 "Trace JVM calls") \
1022 \
1023 product(ccstr, TraceJVMTI, "", \
1024 "Trace flags for JVMTI functions and events") \
1025 \
1026 /* This option can change an EMCP method into an obsolete method. */ \
1027 /* This can affect tests that except specific methods to be EMCP. */ \
1028 /* This option should be used with caution. */ \
1029 product(bool, StressLdcRewrite, false, \
1030 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1031 \
1032 product(intx, TraceRedefineClasses, 0, \
1033 "Trace level for JVMTI RedefineClasses") \
1034 \
1035 /* change to false by default sometime after Mustang */ \
1036 product(bool, VerifyMergedCPBytecodes, true, \
1037 "Verify bytecodes after RedefineClasses constant pool merging") \
1038 \
1039 develop(bool, TraceJNIHandleAllocation, false, \
1040 "Trace allocation/deallocation of JNI handle blocks") \
1041 \
1042 develop(bool, TraceThreadEvents, false, \
1043 "Trace all thread events") \
1044 \
1045 develop(bool, TraceBytecodes, false, \
1046 "Trace bytecode execution") \
1047 \
1048 develop(bool, TraceClassInitialization, false, \
1049 "Trace class initialization") \
1050 \
1051 develop(bool, TraceExceptions, false, \
1052 "Trace exceptions") \
1053 \
1054 develop(bool, TraceICs, false, \
1055 "Trace inline cache changes") \
1056 \
1057 notproduct(bool, TraceInvocationCounterOverflow, false, \
1058 "Trace method invocation counter overflow") \
1059 \
1060 develop(bool, TraceInlineCacheClearing, false, \
1061 "Trace clearing of inline caches in nmethods") \
1062 \
1063 develop(bool, TraceDependencies, false, \
1064 "Trace dependencies") \
1065 \
1066 develop(bool, VerifyDependencies, trueInDebug, \
1067 "Exercise and verify the compilation dependency mechanism") \
1068 \
1069 develop(bool, TraceNewOopMapGeneration, false, \
1070 "Trace OopMapGeneration") \
1071 \
1072 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1073 "Trace OopMapGeneration: print detailed cell states") \
1074 \
1075 develop(bool, TimeOopMap, false, \
1076 "Time calls to GenerateOopMap::compute_map() in sum") \
1077 \
1078 develop(bool, TimeOopMap2, false, \
1079 "Time calls to GenerateOopMap::compute_map() individually") \
1080 \
1081 develop(bool, TraceMonitorMismatch, false, \
1082 "Trace monitor matching failures during OopMapGeneration") \
1083 \
1084 develop(bool, TraceOopMapRewrites, false, \
1085 "Trace rewritting of method oops during oop map generation") \
1086 \
1087 develop(bool, TraceSafepoint, false, \
1088 "Trace safepoint operations") \
1089 \
1090 develop(bool, TraceICBuffer, false, \
1091 "Trace usage of IC buffer") \
1092 \
1093 develop(bool, TraceCompiledIC, false, \
1094 "Trace changes of compiled IC") \
1095 \
1096 notproduct(bool, TraceZapDeadLocals, false, \
1097 "Trace zapping dead locals") \
1098 \
1099 develop(bool, TraceStartupTime, false, \
1100 "Trace setup time") \
1101 \
1102 develop(bool, TraceHPI, false, \
1103 "Trace Host Porting Interface (HPI)") \
1104 \
1105 product(ccstr, HPILibPath, NULL, \
1106 "Specify alternate path to HPI library") \
1107 \
1108 develop(bool, TraceProtectionDomainVerification, false, \
1109 "Trace protection domain verifcation") \
1110 \
1111 develop(bool, TraceClearedExceptions, false, \
1112 "Prints when an exception is forcibly cleared") \
1113 \
1114 product(bool, TraceClassResolution, false, \
1115 "Trace all constant pool resolutions (for debugging)") \
1116 \
1117 product(bool, TraceBiasedLocking, false, \
1118 "Trace biased locking in JVM") \
1119 \
1120 product(bool, TraceMonitorInflation, false, \
1121 "Trace monitor inflation in JVM") \
1122 \
1123 /* assembler */ \
1124 product(bool, Use486InstrsOnly, false, \
1125 "Use 80486 Compliant instruction subset") \
1126 \
1127 /* gc */ \
1128 \
1129 product(bool, UseSerialGC, false, \
1130 "Use the serial garbage collector") \
1131 \
1132 experimental(bool, UseG1GC, false, \
1133 "Use the Garbage-First garbage collector") \
1134 \
1135 product(bool, UseParallelGC, false, \
1136 "Use the Parallel Scavenge garbage collector") \
1137 \
1138 product(bool, UseParallelOldGC, false, \
1139 "Use the Parallel Old garbage collector") \
1140 \
1141 product(bool, UseParallelOldGCCompacting, true, \
1142 "In the Parallel Old garbage collector use parallel compaction") \
1143 \
1144 product(bool, UseParallelDensePrefixUpdate, true, \
1145 "In the Parallel Old garbage collector use parallel dense" \
1146 " prefix update") \
1147 \
1148 develop(bool, UseParallelOldGCChunkPointerCalc, true, \
1149 "In the Parallel Old garbage collector use chucks to calculate" \
1150 " new object locations") \
1151 \
1152 product(uintx, HeapMaximumCompactionInterval, 20, \
1153 "How often should we maximally compact the heap (not allowing " \
1154 "any dead space)") \
1155 \
1156 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1157 "The collection count for the first maximum compaction") \
1158 \
1159 product(bool, UseMaximumCompactionOnSystemGC, true, \
1160 "In the Parallel Old garbage collector maximum compaction for " \
1161 "a system GC") \
1162 \
1163 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1164 "The mean used by the par compact dead wood" \
1165 "limiter (a number between 0-100).") \
1166 \
1167 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1168 "The standard deviation used by the par compact dead wood" \
1169 "limiter (a number between 0-100).") \
1170 \
1171 product(bool, UseParallelOldGCDensePrefix, true, \
1172 "Use a dense prefix with the Parallel Old garbage collector") \
1173 \
1174 product(uintx, ParallelGCThreads, 0, \
1175 "Number of parallel threads parallel gc will use") \
1176 \
1177 product(uintx, ParallelCMSThreads, 0, \
1178 "Max number of threads CMS will use for concurrent work") \
1179 \
1180 develop(bool, VerifyParallelOldWithMarkSweep, false, \
1181 "Use the MarkSweep code to verify phases of Parallel Old") \
1182 \
1183 develop(uintx, VerifyParallelOldWithMarkSweepInterval, 1, \
1184 "Interval at which the MarkSweep code is used to verify " \
1185 "phases of Parallel Old") \
1186 \
1187 develop(bool, ParallelOldMTUnsafeMarkBitMap, false, \
1188 "Use the Parallel Old MT unsafe in marking the bitmap") \
1189 \
1190 develop(bool, ParallelOldMTUnsafeUpdateLiveData, false, \
1191 "Use the Parallel Old MT unsafe in update of live size") \
1192 \
1193 develop(bool, TraceChunkTasksQueuing, false, \
1194 "Trace the queuing of the chunk tasks") \
1195 \
1196 product(uintx, ParallelMarkingThreads, 0, \
1197 "Number of marking threads concurrent gc will use") \
1198 \
1199 product(uintx, YoungPLABSize, 4096, \
1200 "Size of young gen promotion labs (in HeapWords)") \
1201 \
1202 product(uintx, OldPLABSize, 1024, \
1203 "Size of old gen promotion labs (in HeapWords)") \
1204 \
1205 product(uintx, GCTaskTimeStampEntries, 200, \
1206 "Number of time stamp entries per gc worker thread") \
1207 \
1208 product(bool, AlwaysTenure, false, \
1209 "Always tenure objects in eden. (ParallelGC only)") \
1210 \
1211 product(bool, NeverTenure, false, \
1212 "Never tenure objects in eden, May tenure on overflow" \
1213 " (ParallelGC only)") \
1214 \
1215 product(bool, ScavengeBeforeFullGC, true, \
1216 "Scavenge youngest generation before each full GC," \
1217 " used with UseParallelGC") \
1218 \
1219 develop(bool, ScavengeWithObjectsInToSpace, false, \
1220 "Allow scavenges to occur when to_space contains objects.") \
1221 \
1222 product(bool, UseConcMarkSweepGC, false, \
1223 "Use Concurrent Mark-Sweep GC in the old generation") \
1224 \
1225 product(bool, ExplicitGCInvokesConcurrent, false, \
1226 "A System.gc() request invokes a concurrent collection;" \
1227 " (effective only when UseConcMarkSweepGC)") \
1228 \
1229 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1230 "A System.gc() request invokes a concurrent collection and" \
1231 " also unloads classes during such a concurrent gc cycle " \
1232 " (effective only when UseConcMarkSweepGC)") \
1233 \
1234 develop(bool, UseCMSAdaptiveFreeLists, true, \
1235 "Use Adaptive Free Lists in the CMS generation") \
1236 \
1237 develop(bool, UseAsyncConcMarkSweepGC, true, \
1238 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1239 \
1240 develop(bool, RotateCMSCollectionTypes, false, \
1241 "Rotate the CMS collections among concurrent and STW") \
1242 \
1243 product(bool, UseCMSBestFit, true, \
1244 "Use CMS best fit allocation strategy") \
1245 \
1246 product(bool, UseCMSCollectionPassing, true, \
1247 "Use passing of collection from background to foreground") \
1248 \
1249 product(bool, UseParNewGC, false, \
1250 "Use parallel threads in the new generation.") \
1251 \
1252 product(bool, ParallelGCVerbose, false, \
1253 "Verbose output for parallel GC.") \
1254 \
1255 product(intx, ParallelGCBufferWastePct, 10, \
1256 "wasted fraction of parallel allocation buffer.") \
1257 \
1258 product(bool, ParallelGCRetainPLAB, true, \
1259 "Retain parallel allocation buffers across scavenges.") \
1260 \
1261 product(intx, TargetPLABWastePct, 10, \
1262 "target wasted space in last buffer as pct of overall allocation")\
1263 \
1264 product(uintx, PLABWeight, 75, \
1265 "Percentage (0-100) used to weight the current sample when" \
1266 "computing exponentially decaying average for ResizePLAB.") \
1267 \
1268 product(bool, ResizePLAB, true, \
1269 "Dynamically resize (survivor space) promotion labs") \
1270 \
1271 product(bool, PrintPLAB, false, \
1272 "Print (survivor space) promotion labs sizing decisions") \
1273 \
1274 product(intx, ParGCArrayScanChunk, 50, \
1275 "Scan a subset and push remainder, if array is bigger than this") \
1276 \
1277 product(intx, ParGCDesiredObjsFromOverflowList, 20, \
1278 "The desired number of objects to claim from the overflow list") \
1279 \
1280 product(uintx, CMSParPromoteBlocksToClaim, 50, \
1281 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1282 "parallel GC.") \
1283 \
1284 product(bool, AlwaysPreTouch, false, \
1285 "It forces all freshly committed pages to be pre-touched.") \
1286 \
1287 product(bool, CMSUseOldDefaults, false, \
1288 "A flag temporarily introduced to allow reverting to some older" \
1289 "default settings; older as of 6.0 ") \
1290 \
1291 product(intx, CMSYoungGenPerWorker, 16*M, \
1292 "The amount of young gen chosen by default per GC worker " \
1293 "thread available ") \
1294 \
1295 product(bool, GCOverheadReporting, false, \
1296 "Enables the GC overhead reporting facility") \
1297 \
1298 product(intx, GCOverheadReportingPeriodMS, 100, \
1299 "Reporting period for conc GC overhead reporting, in ms ") \
1300 \
1301 product(bool, CMSIncrementalMode, false, \
1302 "Whether CMS GC should operate in \"incremental\" mode") \
1303 \
1304 product(uintx, CMSIncrementalDutyCycle, 10, \
1305 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1306 "CMSIncrementalPacing is enabled, then this is just the initial" \
1307 "value") \
1308 \
1309 product(bool, CMSIncrementalPacing, true, \
1310 "Whether the CMS incremental mode duty cycle should be " \
1311 "automatically adjusted") \
1312 \
1313 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1314 "Lower bound on the duty cycle when CMSIncrementalPacing is" \
1315 "enabled (a percentage, 0-100).") \
1316 \
1317 product(uintx, CMSIncrementalSafetyFactor, 10, \
1318 "Percentage (0-100) used to add conservatism when computing the" \
1319 "duty cycle.") \
1320 \
1321 product(uintx, CMSIncrementalOffset, 0, \
1322 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1323 "is shifted to the right within the period between young GCs") \
1324 \
1325 product(uintx, CMSExpAvgFactor, 25, \
1326 "Percentage (0-100) used to weight the current sample when" \
1327 "computing exponential averages for CMS statistics.") \
1328 \
1329 product(uintx, CMS_FLSWeight, 50, \
1330 "Percentage (0-100) used to weight the current sample when" \
1331 "computing exponentially decating averages for CMS FLS statistics.") \
1332 \
1333 product(uintx, CMS_FLSPadding, 2, \
1334 "The multiple of deviation from mean to use for buffering" \
1335 "against volatility in free list demand.") \
1336 \
1337 product(uintx, FLSCoalescePolicy, 2, \
1338 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1339 \
1340 product(uintx, CMS_SweepWeight, 50, \
1341 "Percentage (0-100) used to weight the current sample when" \
1342 "computing exponentially decaying average for inter-sweep duration.") \
1343 \
1344 product(uintx, CMS_SweepPadding, 2, \
1345 "The multiple of deviation from mean to use for buffering" \
1346 "against volatility in inter-sweep duration.") \
1347 \
1348 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1349 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1350 " duration exceeds this threhold in milliseconds") \
1351 \
1352 develop(bool, CMSTraceIncrementalMode, false, \
1353 "Trace CMS incremental mode") \
1354 \
1355 develop(bool, CMSTraceIncrementalPacing, false, \
1356 "Trace CMS incremental mode pacing computation") \
1357 \
1358 develop(bool, CMSTraceThreadState, false, \
1359 "Trace the CMS thread state (enable the trace_state() method)") \
1360 \
1361 product(bool, CMSClassUnloadingEnabled, false, \
1362 "Whether class unloading enabled when using CMS GC") \
1363 \
1364 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1365 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1366 " for which classes may not be unloaded") \
1367 \
1368 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1369 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1370 \
1371 product(bool, UseCMSCompactAtFullCollection, true, \
1372 "Use mark sweep compact at full collections") \
1373 \
1374 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1375 "Number of CMS full collection done before compaction if > 0") \
1376 \
1377 develop(intx, CMSDictionaryChoice, 0, \
1378 "Use BinaryTreeDictionary as default in the CMS generation") \
1379 \
1380 product(uintx, CMSIndexedFreeListReplenish, 4, \
1381 "Replenish and indexed free list with this number of chunks") \
1382 \
1383 product(bool, CMSLoopWarn, false, \
1384 "Warn in case of excessive CMS looping") \
1385 \
1386 develop(bool, CMSOverflowEarlyRestoration, false, \
1387 "Whether preserved marks should be restored early") \
1388 \
1389 product(uintx, CMSMarkStackSize, 32*K, \
1390 "Size of CMS marking stack") \
1391 \
1392 product(uintx, CMSMarkStackSizeMax, 4*M, \
1393 "Max size of CMS marking stack") \
1394 \
1395 notproduct(bool, CMSMarkStackOverflowALot, false, \
1396 "Whether we should simulate frequent marking stack / work queue" \
1397 " overflow") \
1398 \
1399 notproduct(intx, CMSMarkStackOverflowInterval, 1000, \
1400 "A per-thread `interval' counter that determines how frequently" \
1401 " we simulate overflow; a smaller number increases frequency") \
1402 \
1403 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1404 "(Temporary, subject to experimentation)" \
1405 "Maximum number of abortable preclean iterations, if > 0") \
1406 \
1407 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1408 "(Temporary, subject to experimentation)" \
1409 "Maximum time in abortable preclean in ms") \
1410 \
1411 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1412 "(Temporary, subject to experimentation)" \
1413 "Nominal minimum work per abortable preclean iteration") \
1414 \
1415 product(intx, CMSAbortablePrecleanWaitMillis, 100, \
1416 "(Temporary, subject to experimentation)" \
1417 " Time that we sleep between iterations when not given" \
1418 " enough work per iteration") \
1419 \
1420 product(uintx, CMSRescanMultiple, 32, \
1421 "Size (in cards) of CMS parallel rescan task") \
1422 \
1423 product(uintx, CMSConcMarkMultiple, 32, \
1424 "Size (in cards) of CMS concurrent MT marking task") \
1425 \
1426 product(uintx, CMSRevisitStackSize, 1*M, \
1427 "Size of CMS KlassKlass revisit stack") \
1428 \
1429 product(bool, CMSAbortSemantics, false, \
1430 "Whether abort-on-overflow semantics is implemented") \
1431 \
1432 product(bool, CMSParallelRemarkEnabled, true, \
1433 "Whether parallel remark enabled (only if ParNewGC)") \
1434 \
1435 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1436 "Whether parallel remark of survivor space" \
1437 " enabled (effective only if CMSParallelRemarkEnabled)") \
1438 \
1439 product(bool, CMSPLABRecordAlways, true, \
1440 "Whether to always record survivor space PLAB bdries" \
1441 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1442 \
1443 product(bool, CMSConcurrentMTEnabled, true, \
1444 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1445 \
1446 product(bool, CMSPermGenPrecleaningEnabled, true, \
1447 "Whether concurrent precleaning enabled in perm gen" \
1448 " (effective only when CMSPrecleaningEnabled is true)") \
1449 \
1450 product(bool, CMSPrecleaningEnabled, true, \
1451 "Whether concurrent precleaning enabled") \
1452 \
1453 product(uintx, CMSPrecleanIter, 3, \
1454 "Maximum number of precleaning iteration passes") \
1455 \
1456 product(uintx, CMSPrecleanNumerator, 2, \
1457 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1458 " ratio") \
1459 \
1460 product(uintx, CMSPrecleanDenominator, 3, \
1461 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1462 " ratio") \
1463 \
1464 product(bool, CMSPrecleanRefLists1, true, \
1465 "Preclean ref lists during (initial) preclean phase") \
1466 \
1467 product(bool, CMSPrecleanRefLists2, false, \
1468 "Preclean ref lists during abortable preclean phase") \
1469 \
1470 product(bool, CMSPrecleanSurvivors1, false, \
1471 "Preclean survivors during (initial) preclean phase") \
1472 \
1473 product(bool, CMSPrecleanSurvivors2, true, \
1474 "Preclean survivors during abortable preclean phase") \
1475 \
1476 product(uintx, CMSPrecleanThreshold, 1000, \
1477 "Don't re-iterate if #dirty cards less than this") \
1478 \
1479 product(bool, CMSCleanOnEnter, true, \
1480 "Clean-on-enter optimization for reducing number of dirty cards") \
1481 \
1482 product(uintx, CMSRemarkVerifyVariant, 1, \
1483 "Choose variant (1,2) of verification following remark") \
1484 \
1485 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1486 "If Eden used is below this value, don't try to schedule remark") \
1487 \
1488 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1489 "The Eden occupancy % at which to try and schedule remark pause") \
1490 \
1491 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1492 "Start sampling Eden top at least before yg occupancy reaches" \
1493 " 1/<ratio> of the size at which we plan to schedule remark") \
1494 \
1495 product(uintx, CMSSamplingGrain, 16*K, \
1496 "The minimum distance between eden samples for CMS (see above)") \
1497 \
1498 product(bool, CMSScavengeBeforeRemark, false, \
1499 "Attempt scavenge before the CMS remark step") \
1500 \
1501 develop(bool, CMSTraceSweeper, false, \
1502 "Trace some actions of the CMS sweeper") \
1503 \
1504 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1505 "Don't drain below this size per parallel worker/thief") \
1506 \
1507 product(intx, CMSWaitDuration, 2000, \
1508 "Time in milliseconds that CMS thread waits for young GC") \
1509 \
1510 product(bool, CMSYield, true, \
1511 "Yield between steps of concurrent mark & sweep") \
1512 \
1513 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1514 "Bitmap operations should process at most this many bits" \
1515 "between yields") \
1516 \
1517 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1518 "Verify that all refs across the FLS boundary " \
1519 " are to valid objects") \
1520 \
1521 diagnostic(bool, FLSVerifyLists, false, \
1522 "Do lots of (expensive) FreeListSpace verification") \
1523 \
1524 diagnostic(bool, FLSVerifyIndexTable, false, \
1525 "Do lots of (expensive) FLS index table verification") \
1526 \
1527 develop(bool, FLSVerifyDictionary, false, \
1528 "Do lots of (expensive) FLS dictionary verification") \
1529 \
1530 develop(bool, VerifyBlockOffsetArray, false, \
1531 "Do (expensive!) block offset array verification") \
1532 \
1533 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \
1534 "Maintain _unallocated_block in BlockOffsetArray" \
1535 " (currently applicable only to CMS collector)") \
1536 \
1537 develop(bool, TraceCMSState, false, \
1538 "Trace the state of the CMS collection") \
1539 \
1540 product(intx, RefDiscoveryPolicy, 0, \
1541 "Whether reference-based(0) or referent-based(1)") \
1542 \
1543 product(bool, ParallelRefProcEnabled, false, \
1544 "Enable parallel reference processing whenever possible") \
1545 \
1546 product(bool, ParallelRefProcBalancingEnabled, true, \
1547 "Enable balancing of reference processing queues") \
1548 \
1549 product(intx, CMSTriggerRatio, 80, \
1550 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1551 " allocated before a CMS collection cycle commences") \
1552 \
1553 product(intx, CMSTriggerPermRatio, 80, \
1554 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \
1555 " is allocated before a CMS collection cycle commences, that " \
1556 " also collects the perm generation") \
1557 \
1558 product(uintx, CMSBootstrapOccupancy, 50, \
1559 "Percentage CMS generation occupancy at which to " \
1560 " initiate CMS collection for bootstrapping collection stats") \
1561 \
1562 product(intx, CMSInitiatingOccupancyFraction, -1, \
1563 "Percentage CMS generation occupancy to start a CMS collection " \
1564 " cycle (A negative value means that CMSTriggerRatio is used)") \
1565 \
1566 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1567 "Percentage CMS perm generation occupancy to start a CMScollection"\
1568 " cycle (A negative value means that CMSTriggerPermRatio is used)")\
1569 \
1570 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1571 "Only use occupancy as a crierion for starting a CMS collection") \
1572 \
1573 product(intx, CMSIsTooFullPercentage, 98, \
1574 "An absolute ceiling above which CMS will always consider the" \
1575 " perm gen ripe for collection") \
1576 \
1577 develop(bool, CMSTestInFreeList, false, \
1578 "Check if the coalesced range is already in the " \
1579 "free lists as claimed.") \
1580 \
1581 notproduct(bool, CMSVerifyReturnedBytes, false, \
1582 "Check that all the garbage collected was returned to the " \
1583 "free lists.") \
1584 \
1585 notproduct(bool, ScavengeALot, false, \
1586 "Force scavenge at every Nth exit from the runtime system " \
1587 "(N=ScavengeALotInterval)") \
1588 \
1589 develop(bool, FullGCALot, false, \
1590 "Force full gc at every Nth exit from the runtime system " \
1591 "(N=FullGCALotInterval)") \
1592 \
1593 notproduct(bool, GCALotAtAllSafepoints, false, \
1594 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1595 \
1596 product(bool, HandlePromotionFailure, true, \
1597 "The youngest generation collection does not require" \
1598 " a guarantee of full promotion of all live objects.") \
1599 \
1600 notproduct(bool, PromotionFailureALot, false, \
1601 "Use promotion failure handling on every youngest generation " \
1602 "collection") \
1603 \
1604 develop(uintx, PromotionFailureALotCount, 1000, \
1605 "Number of promotion failures occurring at ParGCAllocBuffer" \
1606 "refill attempts (ParNew) or promotion attempts " \
1607 "(other young collectors) ") \
1608 \
1609 develop(uintx, PromotionFailureALotInterval, 5, \
1610 "Total collections between promotion failures alot") \
1611 \
1612 develop(intx, WorkStealingSleepMillis, 1, \
1613 "Sleep time when sleep is used for yields") \
1614 \
1615 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1616 "Number of yields before a sleep is done during workstealing") \
1617 \
1618 product(uintx, PreserveMarkStackSize, 40, \
1619 "Size for stack used in promotion failure handling") \
1620 \
1621 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1622 \
1623 product_pd(bool, ResizeTLAB, \
1624 "Dynamically resize tlab size for threads") \
1625 \
1626 product(bool, ZeroTLAB, false, \
1627 "Zero out the newly created TLAB") \
1628 \
1629 product(bool, FastTLABRefill, true, \
1630 "Use fast TLAB refill code") \
1631 \
1632 product(bool, PrintTLAB, false, \
1633 "Print various TLAB related information") \
1634 \
1635 product(bool, TLABStats, true, \
1636 "Print various TLAB related information") \
1637 \
1638 product_pd(bool, NeverActAsServerClassMachine, \
1639 "Never act like a server-class machine") \
1640 \
1641 product(bool, AlwaysActAsServerClassMachine, false, \
1642 "Always act like a server-class machine") \
1643 \
1644 product_pd(uintx, DefaultMaxRAM, \
1645 "Maximum real memory size for setting server class heap size") \
1646 \
1647 product(uintx, DefaultMaxRAMFraction, 4, \
1648 "Fraction (1/n) of real memory used for server class max heap") \
1649 \
1650 product(uintx, DefaultInitialRAMFraction, 64, \
1651 "Fraction (1/n) of real memory used for server class initial heap") \
1652 \
1653 product(bool, UseAutoGCSelectPolicy, false, \
1654 "Use automatic collection selection policy") \
1655 \
1656 product(uintx, AutoGCSelectPauseMillis, 5000, \
1657 "Automatic GC selection pause threshhold in ms") \
1658 \
1659 product(bool, UseAdaptiveSizePolicy, true, \
1660 "Use adaptive generation sizing policies") \
1661 \
1662 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1663 "Use adaptive survivor sizing policies") \
1664 \
1665 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1666 "Use adaptive young-old sizing policies at minor collections") \
1667 \
1668 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1669 "Use adaptive young-old sizing policies at major collections") \
1670 \
1671 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1672 "Use statistics from System.GC for adaptive size policy") \
1673 \
1674 product(bool, UseAdaptiveGCBoundary, false, \
1675 "Allow young-old boundary to move") \
1676 \
1677 develop(bool, TraceAdaptiveGCBoundary, false, \
1678 "Trace young-old boundary moves") \
1679 \
1680 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
1681 "Resize the virtual spaces of the young or old generations") \
1682 \
1683 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
1684 "Policy for changeing generation size for throughput goals") \
1685 \
1686 product(uintx, AdaptiveSizePausePolicy, 0, \
1687 "Policy for changing generation size for pause goals") \
1688 \
1689 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
1690 "Adjust tenured generation to achive a minor pause goal") \
1691 \
1692 develop(bool, PSAdjustYoungGenForMajorPause, false, \
1693 "Adjust young generation to achive a major pause goal") \
1694 \
1695 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
1696 "Number of steps where heuristics is used before data is used") \
1697 \
1698 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
1699 "Number of collections before the adaptive sizing is started") \
1700 \
1701 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
1702 "Collecton interval for printing information, zero => never") \
1703 \
1704 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
1705 "Use adaptive minimum footprint as a goal") \
1706 \
1707 product(uintx, AdaptiveSizePolicyWeight, 10, \
1708 "Weight given to exponential resizing, between 0 and 100") \
1709 \
1710 product(uintx, AdaptiveTimeWeight, 25, \
1711 "Weight given to time in adaptive policy, between 0 and 100") \
1712 \
1713 product(uintx, PausePadding, 1, \
1714 "How much buffer to keep for pause time") \
1715 \
1716 product(uintx, PromotedPadding, 3, \
1717 "How much buffer to keep for promotion failure") \
1718 \
1719 product(uintx, SurvivorPadding, 3, \
1720 "How much buffer to keep for survivor overflow") \
1721 \
1722 product(uintx, AdaptivePermSizeWeight, 20, \
1723 "Weight for perm gen exponential resizing, between 0 and 100") \
1724 \
1725 product(uintx, PermGenPadding, 3, \
1726 "How much buffer to keep for perm gen sizing") \
1727 \
1728 product(uintx, ThresholdTolerance, 10, \
1729 "Allowed collection cost difference between generations") \
1730 \
1731 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
1732 "If collection costs are within margin, reduce both by full delta") \
1733 \
1734 product(uintx, YoungGenerationSizeIncrement, 20, \
1735 "Adaptive size percentage change in young generation") \
1736 \
1737 product(uintx, YoungGenerationSizeSupplement, 80, \
1738 "Supplement to YoungedGenerationSizeIncrement used at startup") \
1739 \
1740 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
1741 "Decay factor to YoungedGenerationSizeSupplement") \
1742 \
1743 product(uintx, TenuredGenerationSizeIncrement, 20, \
1744 "Adaptive size percentage change in tenured generation") \
1745 \
1746 product(uintx, TenuredGenerationSizeSupplement, 80, \
1747 "Supplement to TenuredGenerationSizeIncrement used at startup") \
1748 \
1749 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
1750 "Decay factor to TenuredGenerationSizeIncrement") \
1751 \
1752 product(uintx, MaxGCPauseMillis, max_uintx, \
1753 "Adaptive size policy maximum GC pause time goal in msec") \
1754 \
1755 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
1756 "Adaptive size policy maximum GC minor pause time goal in msec") \
1757 \
1758 product(uintx, GCTimeRatio, 99, \
1759 "Adaptive size policy application time to GC time ratio") \
1760 \
1761 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
1762 "Adaptive size scale down factor for shrinking") \
1763 \
1764 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
1765 "Adaptive size decays the major cost for long major intervals") \
1766 \
1767 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
1768 "Time scale over which major costs decay") \
1769 \
1770 product(uintx, MinSurvivorRatio, 3, \
1771 "Minimum ratio of young generation/survivor space size") \
1772 \
1773 product(uintx, InitialSurvivorRatio, 8, \
1774 "Initial ratio of eden/survivor space size") \
1775 \
1776 product(uintx, BaseFootPrintEstimate, 256*M, \
1777 "Estimate of footprint other than Java Heap") \
1778 \
1779 product(bool, UseGCOverheadLimit, true, \
1780 "Use policy to limit of proportion of time spent in GC " \
1781 "before an OutOfMemory error is thrown") \
1782 \
1783 product(uintx, GCTimeLimit, 98, \
1784 "Limit of proportion of time spent in GC before an OutOfMemory" \
1785 "error is thrown (used with GCHeapFreeLimit)") \
1786 \
1787 product(uintx, GCHeapFreeLimit, 2, \
1788 "Minimum percentage of free space after a full GC before an " \
1789 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
1790 \
1791 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
1792 "Number of consecutive collections before gc time limit fires") \
1793 \
1794 product(bool, PrintAdaptiveSizePolicy, false, \
1795 "Print information about AdaptiveSizePolicy") \
1796 \
1797 product(intx, PrefetchCopyIntervalInBytes, -1, \
1798 "How far ahead to prefetch destination area (<= 0 means off)") \
1799 \
1800 product(intx, PrefetchScanIntervalInBytes, -1, \
1801 "How far ahead to prefetch scan area (<= 0 means off)") \
1802 \
1803 product(intx, PrefetchFieldsAhead, -1, \
1804 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
1805 \
1806 develop(bool, UsePrefetchQueue, true, \
1807 "Use the prefetch queue during PS promotion") \
1808 \
1809 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
1810 "Verify system before exiting") \
1811 \
1812 diagnostic(bool, VerifyBeforeGC, false, \
1813 "Verify memory system before GC") \
1814 \
1815 diagnostic(bool, VerifyAfterGC, false, \
1816 "Verify memory system after GC") \
1817 \
1818 diagnostic(bool, VerifyDuringGC, false, \
1819 "Verify memory system during GC (between phases)") \
1820 \
1821 diagnostic(bool, VerifyRememberedSets, false, \
1822 "Verify GC remembered sets") \
1823 \
1824 diagnostic(bool, VerifyObjectStartArray, true, \
1825 "Verify GC object start array if verify before/after") \
1826 \
1827 product(bool, DisableExplicitGC, false, \
1828 "Tells whether calling System.gc() does a full GC") \
1829 \
1830 notproduct(bool, CheckMemoryInitialization, false, \
1831 "Checks memory initialization") \
1832 \
1833 product(bool, CollectGen0First, false, \
1834 "Collect youngest generation before each full GC") \
1835 \
1836 diagnostic(bool, BindCMSThreadToCPU, false, \
1837 "Bind CMS Thread to CPU if possible") \
1838 \
1839 diagnostic(uintx, CPUForCMSThread, 0, \
1840 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
1841 \
1842 product(bool, BindGCTaskThreadsToCPUs, false, \
1843 "Bind GCTaskThreads to CPUs if possible") \
1844 \
1845 product(bool, UseGCTaskAffinity, false, \
1846 "Use worker affinity when asking for GCTasks") \
1847 \
1848 product(uintx, ProcessDistributionStride, 4, \
1849 "Stride through processors when distributing processes") \
1850 \
1851 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
1852 "number of times the coordinator GC thread will sleep while " \
1853 "yielding before giving up and resuming GC") \
1854 \
1855 product(uintx, CMSYieldSleepCount, 0, \
1856 "number of times a GC thread (minus the coordinator) " \
1857 "will sleep while yielding before giving up and resuming GC") \
1858 \
1859 notproduct(bool, PrintFlagsFinal, false, \
1860 "Print all command line flags after argument processing") \
1861 \
1862 /* gc tracing */ \
1863 manageable(bool, PrintGC, false, \
1864 "Print message at garbage collect") \
1865 \
1866 manageable(bool, PrintGCDetails, false, \
1867 "Print more details at garbage collect") \
1868 \
1869 manageable(bool, PrintGCDateStamps, false, \
1870 "Print date stamps at garbage collect") \
1871 \
1872 manageable(bool, PrintGCTimeStamps, false, \
1873 "Print timestamps at garbage collect") \
1874 \
1875 product(bool, PrintGCTaskTimeStamps, false, \
1876 "Print timestamps for individual gc worker thread tasks") \
1877 \
1878 develop(intx, ConcGCYieldTimeout, 0, \
1879 "If non-zero, assert that GC threads yield within this # of ms.") \
1880 \
1881 notproduct(bool, TraceMarkSweep, false, \
1882 "Trace mark sweep") \
1883 \
1884 product(bool, PrintReferenceGC, false, \
1885 "Print times spent handling reference objects during GC " \
1886 " (enabled only when PrintGCDetails)") \
1887 \
1888 develop(bool, TraceReferenceGC, false, \
1889 "Trace handling of soft/weak/final/phantom references") \
1890 \
1891 develop(bool, TraceFinalizerRegistration, false, \
1892 "Trace registration of final references") \
1893 \
1894 notproduct(bool, TraceScavenge, false, \
1895 "Trace scavenge") \
1896 \
1897 product_rw(bool, TraceClassLoading, false, \
1898 "Trace all classes loaded") \
1899 \
1900 product(bool, TraceClassLoadingPreorder, false, \
1901 "Trace all classes loaded in order referenced (not loaded)") \
1902 \
1903 product_rw(bool, TraceClassUnloading, false, \
1904 "Trace unloading of classes") \
1905 \
1906 product_rw(bool, TraceLoaderConstraints, false, \
1907 "Trace loader constraints") \
1908 \
1909 product(bool, TraceGen0Time, false, \
1910 "Trace accumulated time for Gen 0 collection") \
1911 \
1912 product(bool, TraceGen1Time, false, \
1913 "Trace accumulated time for Gen 1 collection") \
1914 \
1915 product(bool, PrintTenuringDistribution, false, \
1916 "Print tenuring age information") \
1917 \
1918 product_rw(bool, PrintHeapAtGC, false, \
1919 "Print heap layout before and after each GC") \
1920 \
1921 product(bool, PrintHeapAtSIGBREAK, true, \
1922 "Print heap layout in response to SIGBREAK") \
1923 \
1924 manageable(bool, PrintClassHistogram, false, \
1925 "Print a histogram of class instances") \
1926 \
1927 develop(bool, TraceWorkGang, false, \
1928 "Trace activities of work gangs") \
1929 \
1930 product(bool, TraceParallelOldGCTasks, false, \
1931 "Trace multithreaded GC activity") \
1932 \
1933 develop(bool, TraceBlockOffsetTable, false, \
1934 "Print BlockOffsetTable maps") \
1935 \
1936 develop(bool, TraceCardTableModRefBS, false, \
1937 "Print CardTableModRefBS maps") \
1938 \
1939 develop(bool, TraceGCTaskManager, false, \
1940 "Trace actions of the GC task manager") \
1941 \
1942 develop(bool, TraceGCTaskQueue, false, \
1943 "Trace actions of the GC task queues") \
1944 \
1945 develop(bool, TraceGCTaskThread, false, \
1946 "Trace actions of the GC task threads") \
1947 \
1948 product(bool, PrintParallelOldGCPhaseTimes, false, \
1949 "Print the time taken by each parallel old gc phase." \
1950 "PrintGCDetails must also be enabled.") \
1951 \
1952 develop(bool, TraceParallelOldGCMarkingPhase, false, \
1953 "Trace parallel old gc marking phase") \
1954 \
1955 develop(bool, TraceParallelOldGCSummaryPhase, false, \
1956 "Trace parallel old gc summary phase") \
1957 \
1958 develop(bool, TraceParallelOldGCCompactionPhase, false, \
1959 "Trace parallel old gc compaction phase") \
1960 \
1961 develop(bool, TraceParallelOldGCDensePrefix, false, \
1962 "Trace parallel old gc dense prefix computation") \
1963 \
1964 develop(bool, IgnoreLibthreadGPFault, false, \
1965 "Suppress workaround for libthread GP fault") \
1966 \
1967 product(bool, PrintJNIGCStalls, false, \
1968 "Print diagnostic message when GC is stalled" \
1969 "by JNI critical section") \
1970 \
1971 /* JVMTI heap profiling */ \
1972 \
1973 diagnostic(bool, TraceJVMTIObjectTagging, false, \
1974 "Trace JVMTI object tagging calls") \
1975 \
1976 diagnostic(bool, VerifyBeforeIteration, false, \
1977 "Verify memory system before JVMTI iteration") \
1978 \
1979 /* compiler interface */ \
1980 \
1981 develop(bool, CIPrintCompilerName, false, \
1982 "when CIPrint is active, print the name of the active compiler") \
1983 \
1984 develop(bool, CIPrintCompileQueue, false, \
1985 "display the contents of the compile queue whenever a " \
1986 "compilation is enqueued") \
1987 \
1988 develop(bool, CIPrintRequests, false, \
1989 "display every request for compilation") \
1990 \
1991 product(bool, CITime, false, \
1992 "collect timing information for compilation") \
1993 \
1994 develop(bool, CITimeEach, false, \
1995 "display timing information after each successful compilation") \
1996 \
1997 develop(bool, CICountOSR, true, \
1998 "use a separate counter when assigning ids to osr compilations") \
1999 \
2000 develop(bool, CICompileNatives, true, \
2001 "compile native methods if supported by the compiler") \
2002 \
2003 develop_pd(bool, CICompileOSR, \
2004 "compile on stack replacement methods if supported by the " \
2005 "compiler") \
2006 \
2007 develop(bool, CIPrintMethodCodes, false, \
2008 "print method bytecodes of the compiled code") \
2009 \
2010 develop(bool, CIPrintTypeFlow, false, \
2011 "print the results of ciTypeFlow analysis") \
2012 \
2013 develop(bool, CITraceTypeFlow, false, \
2014 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2015 \
2016 develop(intx, CICloneLoopTestLimit, 100, \
2017 "size limit for blocks heuristically cloned in ciTypeFlow") \
2018 \
2019 /* temp diagnostics */ \
2020 \
2021 diagnostic(bool, TraceRedundantCompiles, false, \
2022 "Have compile broker print when a request already in the queue is"\
2023 " requested again") \
2024 \
2025 diagnostic(bool, InitialCompileFast, false, \
2026 "Initial compile at CompLevel_fast_compile") \
2027 \
2028 diagnostic(bool, InitialCompileReallyFast, false, \
2029 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2030 \
2031 diagnostic(bool, FullProfileOnReInterpret, true, \
2032 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2033 \
2034 /* compiler */ \
2035 \
2036 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2037 "Number of compiler threads to run") \
2038 \
2039 product(intx, CompilationPolicyChoice, 0, \
2040 "which compilation policy (0/1)") \
2041 \
2042 develop(bool, UseStackBanging, true, \
2043 "use stack banging for stack overflow checks (required for " \
2044 "proper StackOverflow handling; disable only to measure cost " \
2045 "of stackbanging)") \
2046 \
2047 develop(bool, Use24BitFPMode, true, \
2048 "Set 24-bit FPU mode on a per-compile basis ") \
2049 \
2050 develop(bool, Use24BitFP, true, \
2051 "use FP instructions that produce 24-bit precise results") \
2052 \
2053 develop(bool, UseStrictFP, true, \
2054 "use strict fp if modifier strictfp is set") \
2055 \
2056 develop(bool, GenerateSynchronizationCode, true, \
2057 "generate locking/unlocking code for synchronized methods and " \
2058 "monitors") \
2059 \
2060 develop(bool, GenerateCompilerNullChecks, true, \
2061 "Generate explicit null checks for loads/stores/calls") \
2062 \
2063 develop(bool, GenerateRangeChecks, true, \
2064 "Generate range checks for array accesses") \
2065 \
2066 develop_pd(bool, ImplicitNullChecks, \
2067 "generate code for implicit null checks") \
2068 \
2069 product(bool, PrintSafepointStatistics, false, \
2070 "print statistics about safepoint synchronization") \
2071 \
2072 product(intx, PrintSafepointStatisticsCount, 300, \
2073 "total number of safepoint statistics collected " \
2074 "before printing them out") \
2075 \
2076 product(intx, PrintSafepointStatisticsTimeout, -1, \
2077 "print safepoint statistics only when safepoint takes" \
2078 " more than PrintSafepointSatisticsTimeout in millis") \
2079 \
2080 develop(bool, InlineAccessors, true, \
2081 "inline accessor methods (get/set)") \
2082 \
2083 product(bool, Inline, true, \
2084 "enable inlining") \
2085 \
2086 product(bool, ClipInlining, true, \
2087 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2088 \
2089 develop(bool, UseCHA, true, \
2090 "enable CHA") \
2091 \
2092 product(bool, UseTypeProfile, true, \
2093 "Check interpreter profile for historically monomorphic calls") \
2094 \
2095 product(intx, TypeProfileMajorReceiverPercent, 90, \
2096 "% of major receiver type to all profiled receivers") \
2097 \
2098 notproduct(bool, TimeCompiler, false, \
2099 "time the compiler") \
2100 \
2101 notproduct(bool, TimeCompiler2, false, \
2102 "detailed time the compiler (requires +TimeCompiler)") \
2103 \
2104 diagnostic(bool, PrintInlining, false, \
2105 "prints inlining optimizations") \
2106 \
2107 diagnostic(bool, PrintIntrinsics, false, \
2108 "prints attempted and successful inlining of intrinsics") \
2109 \
2110 diagnostic(ccstrlist, DisableIntrinsic, "", \
2111 "do not expand intrinsics whose (internal) names appear here") \
2112 \
2113 develop(bool, StressReflectiveCode, false, \
2114 "Use inexact types at allocations, etc., to test reflection") \
2115 \
2116 develop(bool, EagerInitialization, false, \
2117 "Eagerly initialize classes if possible") \
2118 \
2119 product(bool, Tier1UpdateMethodData, trueInTiered, \
2120 "Update methodDataOops in Tier1-generated code") \
2121 \
2122 develop(bool, TraceMethodReplacement, false, \
2123 "Print when methods are replaced do to recompilation") \
2124 \
2125 develop(bool, PrintMethodFlushing, false, \
2126 "print the nmethods being flushed") \
2127 \
2128 notproduct(bool, LogMultipleMutexLocking, false, \
2129 "log locking and unlocking of mutexes (only if multiple locks " \
2130 "are held)") \
2131 \
2132 develop(bool, UseRelocIndex, false, \
2133 "use an index to speed random access to relocations") \
2134 \
2135 develop(bool, StressCodeBuffers, false, \
2136 "Exercise code buffer expansion and other rare state changes") \
2137 \
2138 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2139 "Generate extra debugging info for non-safepoints in nmethods") \
2140 \
2141 diagnostic(bool, DebugInlinedCalls, true, \
2142 "If false, restricts profiled locations to the root method only") \
2143 \
2144 product(bool, PrintVMOptions, trueInDebug, \
2145 "print VM flag settings") \
2146 \
2147 diagnostic(bool, SerializeVMOutput, true, \
2148 "Use a mutex to serialize output to tty and hotspot.log") \
2149 \
2150 diagnostic(bool, DisplayVMOutput, true, \
2151 "Display all VM output on the tty, independently of LogVMOutput") \
2152 \
2153 diagnostic(bool, LogVMOutput, trueInDebug, \
2154 "Save VM output to hotspot.log, or to LogFile") \
2155 \
2156 diagnostic(ccstr, LogFile, NULL, \
2157 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2158 \
2159 product(ccstr, ErrorFile, NULL, \
2160 "If an error occurs, save the error data to this file " \
2161 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2162 \
2163 product(bool, DisplayVMOutputToStderr, false, \
2164 "If DisplayVMOutput is true, display all VM output to stderr") \
2165 \
2166 product(bool, DisplayVMOutputToStdout, false, \
2167 "If DisplayVMOutput is true, display all VM output to stdout") \
2168 \
2169 product(bool, UseHeavyMonitors, false, \
2170 "use heavyweight instead of lightweight Java monitors") \
2171 \
2172 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2173 "print histogram of the symbol table") \
2174 \
2175 notproduct(bool, ExitVMOnVerifyError, false, \
2176 "standard exit from VM if bytecode verify error " \
2177 "(only in debug mode)") \
2178 \
2179 notproduct(ccstr, AbortVMOnException, NULL, \
2180 "Call fatal if this exception is thrown. Example: " \
2181 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2182 \
2183 develop(bool, DebugVtables, false, \
2184 "add debugging code to vtable dispatch") \
2185 \
2186 develop(bool, PrintVtables, false, \
2187 "print vtables when printing klass") \
2188 \
2189 notproduct(bool, PrintVtableStats, false, \
2190 "print vtables stats at end of run") \
2191 \
2192 develop(bool, TraceCreateZombies, false, \
2193 "trace creation of zombie nmethods") \
2194 \
2195 notproduct(bool, IgnoreLockingAssertions, false, \
2196 "disable locking assertions (for speed)") \
2197 \
2198 notproduct(bool, VerifyLoopOptimizations, false, \
2199 "verify major loop optimizations") \
2200 \
2201 product(bool, RangeCheckElimination, true, \
2202 "Split loop iterations to eliminate range checks") \
2203 \
2204 develop_pd(bool, UncommonNullCast, \
2205 "track occurrences of null in casts; adjust compiler tactics") \
2206 \
2207 develop(bool, TypeProfileCasts, true, \
2208 "treat casts like calls for purposes of type profiling") \
2209 \
2210 develop(bool, MonomorphicArrayCheck, true, \
2211 "Uncommon-trap array store checks that require full type check") \
2212 \
2213 develop(bool, DelayCompilationDuringStartup, true, \
2214 "Delay invoking the compiler until main application class is " \
2215 "loaded") \
2216 \
2217 develop(bool, CompileTheWorld, false, \
2218 "Compile all methods in all classes in bootstrap class path " \
2219 "(stress test)") \
2220 \
2221 develop(bool, CompileTheWorldPreloadClasses, true, \
2222 "Preload all classes used by a class before start loading") \
2223 \
2224 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2225 "Compile all methods although class initializer failed") \
2226 \
2227 develop(bool, TraceIterativeGVN, false, \
2228 "Print progress during Iterative Global Value Numbering") \
2229 \
2230 develop(bool, FillDelaySlots, true, \
2231 "Fill delay slots (on SPARC only)") \
2232 \
2233 develop(bool, VerifyIterativeGVN, false, \
2234 "Verify Def-Use modifications during sparse Iterative Global " \
2235 "Value Numbering") \
2236 \
2237 notproduct(bool, TracePhaseCCP, false, \
2238 "Print progress during Conditional Constant Propagation") \
2239 \
2240 develop(bool, TimeLivenessAnalysis, false, \
2241 "Time computation of bytecode liveness analysis") \
2242 \
2243 develop(bool, TraceLivenessGen, false, \
2244 "Trace the generation of liveness analysis information") \
2245 \
2246 notproduct(bool, TraceLivenessQuery, false, \
2247 "Trace queries of liveness analysis information") \
2248 \
2249 notproduct(bool, CollectIndexSetStatistics, false, \
2250 "Collect information about IndexSets") \
2251 \
2252 develop(bool, PrintDominators, false, \
2253 "Print out dominator trees for GVN") \
2254 \
2255 develop(bool, UseLoopSafepoints, true, \
2256 "Generate Safepoint nodes in every loop") \
2257 \
2258 notproduct(bool, TraceCISCSpill, false, \
2259 "Trace allocators use of cisc spillable instructions") \
2260 \
2261 notproduct(bool, TraceSpilling, false, \
2262 "Trace spilling") \
2263 \
2264 develop(bool, DeutschShiffmanExceptions, true, \
2265 "Fast check to find exception handler for precisely typed " \
2266 "exceptions") \
2267 \
2268 product(bool, SplitIfBlocks, true, \
2269 "Clone compares and control flow through merge points to fold " \
2270 "some branches") \
2271 \
2272 develop(intx, FastAllocateSizeLimit, 128*K, \
2273 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2274 "Inline allocations larger than this in doublewords must go slow")\
2275 \
2276 product(bool, AggressiveOpts, false, \
2277 "Enable aggressive optimizations - see arguments.cpp") \
2278 \
2279 product(bool, UseStringCache, false, \
2280 "Enable String cache capabilities on String.java") \
2281 \
2282 /* statistics */ \
2283 develop(bool, UseVTune, false, \
2284 "enable support for Intel's VTune profiler") \
2285 \
2286 develop(bool, CountCompiledCalls, false, \
2287 "counts method invocations") \
2288 \
2289 notproduct(bool, CountRuntimeCalls, false, \
2290 "counts VM runtime calls") \
2291 \
2292 develop(bool, CountJNICalls, false, \
2293 "counts jni method invocations") \
2294 \
2295 notproduct(bool, CountJVMCalls, false, \
2296 "counts jvm method invocations") \
2297 \
2298 notproduct(bool, CountRemovableExceptions, false, \
2299 "count exceptions that could be replaced by branches due to " \
2300 "inlining") \
2301 \
2302 notproduct(bool, ICMissHistogram, false, \
2303 "produce histogram of IC misses") \
2304 \
2305 notproduct(bool, PrintClassStatistics, false, \
2306 "prints class statistics at end of run") \
2307 \
2308 notproduct(bool, PrintMethodStatistics, false, \
2309 "prints method statistics at end of run") \
2310 \
2311 /* interpreter */ \
2312 develop(bool, ClearInterpreterLocals, false, \
2313 "Always clear local variables of interpreter activations upon " \
2314 "entry") \
2315 \
2316 product_pd(bool, RewriteBytecodes, \
2317 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2318 \
2319 product_pd(bool, RewriteFrequentPairs, \
2320 "Rewrite frequently used bytecode pairs into a single bytecode") \
2321 \
2322 diagnostic(bool, PrintInterpreter, false, \
2323 "Prints the generated interpreter code") \
2324 \
2325 product(bool, UseInterpreter, true, \
2326 "Use interpreter for non-compiled methods") \
2327 \
2328 develop(bool, UseFastSignatureHandlers, true, \
2329 "Use fast signature handlers for native calls") \
2330 \
2331 develop(bool, UseV8InstrsOnly, false, \
2332 "Use SPARC-V8 Compliant instruction subset") \
2333 \
2334 product(bool, UseNiagaraInstrs, false, \
2335 "Use Niagara-efficient instruction subset") \
2336 \
2337 develop(bool, UseCASForSwap, false, \
2338 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2339 \
2340 product(bool, UseLoopCounter, true, \
2341 "Increment invocation counter on backward branch") \
2342 \
2343 product(bool, UseFastEmptyMethods, true, \
2344 "Use fast method entry code for empty methods") \
2345 \
2346 product(bool, UseFastAccessorMethods, true, \
2347 "Use fast method entry code for accessor methods") \
2348 \
2349 product_pd(bool, UseOnStackReplacement, \
2350 "Use on stack replacement, calls runtime if invoc. counter " \
2351 "overflows in loop") \
2352 \
2353 notproduct(bool, TraceOnStackReplacement, false, \
2354 "Trace on stack replacement") \
2355 \
2356 develop(bool, PoisonOSREntry, true, \
2357 "Detect abnormal calls to OSR code") \
2358 \
2359 product_pd(bool, PreferInterpreterNativeStubs, \
2360 "Use always interpreter stubs for native methods invoked via " \
2361 "interpreter") \
2362 \
2363 develop(bool, CountBytecodes, false, \
2364 "Count number of bytecodes executed") \
2365 \
2366 develop(bool, PrintBytecodeHistogram, false, \
2367 "Print histogram of the executed bytecodes") \
2368 \
2369 develop(bool, PrintBytecodePairHistogram, false, \
2370 "Print histogram of the executed bytecode pairs") \
2371 \
2372 diagnostic(bool, PrintSignatureHandlers, false, \
2373 "Print code generated for native method signature handlers") \
2374 \
2375 develop(bool, VerifyOops, false, \
2376 "Do plausibility checks for oops") \
2377 \
2378 develop(bool, CheckUnhandledOops, false, \
2379 "Check for unhandled oops in VM code") \
2380 \
2381 develop(bool, VerifyJNIFields, trueInDebug, \
2382 "Verify jfieldIDs for instance fields") \
2383 \
2384 notproduct(bool, VerifyJNIEnvThread, false, \
2385 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2386 "from JNI") \
2387 \
2388 develop(bool, VerifyFPU, false, \
2389 "Verify FPU state (check for NaN's, etc.)") \
2390 \
2391 develop(bool, VerifyThread, false, \
2392 "Watch the thread register for corruption (SPARC only)") \
2393 \
2394 develop(bool, VerifyActivationFrameSize, false, \
2395 "Verify that activation frame didn't become smaller than its " \
2396 "minimal size") \
2397 \
2398 develop(bool, TraceFrequencyInlining, false, \
2399 "Trace frequency based inlining") \
2400 \
2401 notproduct(bool, TraceTypeProfile, false, \
2402 "Trace type profile") \
2403 \
2404 develop_pd(bool, InlineIntrinsics, \
2405 "Inline intrinsics that can be statically resolved") \
2406 \
2407 product_pd(bool, ProfileInterpreter, \
2408 "Profile at the bytecode level during interpretation") \
2409 \
2410 develop_pd(bool, ProfileTraps, \
2411 "Profile deoptimization traps at the bytecode level") \
2412 \
2413 product(intx, ProfileMaturityPercentage, 20, \
2414 "number of method invocations/branches (expressed as % of " \
2415 "CompileThreshold) before using the method's profile") \
2416 \
2417 develop(bool, PrintMethodData, false, \
2418 "Print the results of +ProfileInterpreter at end of run") \
2419 \
2420 develop(bool, VerifyDataPointer, trueInDebug, \
2421 "Verify the method data pointer during interpreter profiling") \
2422 \
2423 develop(bool, VerifyCompiledCode, false, \
2424 "Include miscellaneous runtime verifications in nmethod code; " \
2425 "off by default because it disturbs nmethod size heuristics.") \
2426 \
2427 \
2428 /* compilation */ \
2429 product(bool, UseCompiler, true, \
2430 "use compilation") \
2431 \
2432 develop(bool, TraceCompilationPolicy, false, \
2433 "Trace compilation policy") \
2434 \
2435 develop(bool, TimeCompilationPolicy, false, \
2436 "Time the compilation policy") \
2437 \
2438 product(bool, UseCounterDecay, true, \
2439 "adjust recompilation counters") \
2440 \
2441 develop(intx, CounterHalfLifeTime, 30, \
2442 "half-life time of invocation counters (in secs)") \
2443 \
2444 develop(intx, CounterDecayMinIntervalLength, 500, \
2445 "Min. ms. between invocation of CounterDecay") \
2446 \
2447 product(bool, AlwaysCompileLoopMethods, false, \
2448 "when using recompilation, never interpret methods " \
2449 "containing loops") \
2450 \
2451 product(bool, DontCompileHugeMethods, true, \
2452 "don't compile methods > HugeMethodLimit") \
2453 \
2454 /* Bytecode escape analysis estimation. */ \
2455 product(bool, EstimateArgEscape, true, \
2456 "Analyze bytecodes to estimate escape state of arguments") \
2457 \
2458 product(intx, BCEATraceLevel, 0, \
2459 "How much tracing to do of bytecode escape analysis estimates") \
2460 \
2461 product(intx, MaxBCEAEstimateLevel, 5, \
2462 "Maximum number of nested calls that are analyzed by BC EA.") \
2463 \
2464 product(intx, MaxBCEAEstimateSize, 150, \
2465 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2466 \
2467 product(intx, AllocatePrefetchStyle, 1, \
2468 "0 = no prefetch, " \
2469 "1 = prefetch instructions for each allocation, " \
2470 "2 = use TLAB watermark to gate allocation prefetch") \
2471 \
2472 product(intx, AllocatePrefetchDistance, -1, \
2473 "Distance to prefetch ahead of allocation pointer") \
2474 \
2475 product(intx, AllocatePrefetchLines, 1, \
2476 "Number of lines to prefetch ahead of allocation pointer") \
2477 \
2478 product(intx, AllocatePrefetchStepSize, 16, \
2479 "Step size in bytes of sequential prefetch instructions") \
2480 \
2481 product(intx, AllocatePrefetchInstr, 0, \
2482 "Prefetch instruction to prefetch ahead of allocation pointer") \
2483 \
2484 product(intx, ReadPrefetchInstr, 0, \
2485 "Prefetch instruction to prefetch ahead") \
2486 \
2487 /* deoptimization */ \
2488 develop(bool, TraceDeoptimization, false, \
2489 "Trace deoptimization") \
2490 \
2491 develop(bool, DebugDeoptimization, false, \
2492 "Tracing various information while debugging deoptimization") \
2493 \
2494 product(intx, SelfDestructTimer, 0, \
2495 "Will cause VM to terminate after a given time (in minutes) " \
2496 "(0 means off)") \
2497 \
2498 product(intx, MaxJavaStackTraceDepth, 1024, \
2499 "Max. no. of lines in the stack trace for Java exceptions " \
2500 "(0 means all)") \
2501 \
2502 develop(intx, GuaranteedSafepointInterval, 1000, \
2503 "Guarantee a safepoint (at least) every so many milliseconds " \
2504 "(0 means none)") \
2505 \
2506 product(intx, SafepointTimeoutDelay, 10000, \
2507 "Delay in milliseconds for option SafepointTimeout") \
2508 \
2509 product(intx, NmethodSweepFraction, 4, \
2510 "Number of invocations of sweeper to cover all nmethods") \
2511 \
2512 notproduct(intx, MemProfilingInterval, 500, \
2513 "Time between each invocation of the MemProfiler") \
2514 \
2515 develop(intx, MallocCatchPtr, -1, \
2516 "Hit breakpoint when mallocing/freeing this pointer") \
2517 \
2518 notproduct(intx, AssertRepeat, 1, \
2519 "number of times to evaluate expression in assert " \
2520 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2521 \
2522 notproduct(ccstrlist, SuppressErrorAt, "", \
2523 "List of assertions (file:line) to muzzle") \
2524 \
2525 notproduct(uintx, HandleAllocationLimit, 1024, \
2526 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2527 "is used") \
2528 \
2529 develop(uintx, TotalHandleAllocationLimit, 1024, \
2530 "Threshold for total handle allocation when " \
2531 "+TraceHandleAllocation is used") \
2532 \
2533 develop(intx, StackPrintLimit, 100, \
2534 "number of stack frames to print in VM-level stack dump") \
2535 \
2536 notproduct(intx, MaxElementPrintSize, 256, \
2537 "maximum number of elements to print") \
2538 \
2539 notproduct(intx, MaxSubklassPrintSize, 4, \
2540 "maximum number of subklasses to print when printing klass") \
2541 \
2542 develop(intx, MaxInlineLevel, 9, \
2543 "maximum number of nested calls that are inlined") \
2544 \
2545 develop(intx, MaxRecursiveInlineLevel, 1, \
2546 "maximum number of nested recursive calls that are inlined") \
2547 \
2548 develop(intx, InlineSmallCode, 1000, \
2549 "Only inline already compiled methods if their code size is " \
2550 "less than this") \
2551 \
2552 product(intx, MaxInlineSize, 35, \
2553 "maximum bytecode size of a method to be inlined") \
2554 \
2555 product_pd(intx, FreqInlineSize, \
2556 "maximum bytecode size of a frequent method to be inlined") \
2557 \
2558 develop(intx, MaxTrivialSize, 6, \
2559 "maximum bytecode size of a trivial method to be inlined") \
2560 \
2561 develop(intx, MinInliningThreshold, 250, \
2562 "min. invocation count a method needs to have to be inlined") \
2563 \
2564 develop(intx, AlignEntryCode, 4, \
2565 "aligns entry code to specified value (in bytes)") \
2566 \
2567 develop(intx, MethodHistogramCutoff, 100, \
2568 "cutoff value for method invoc. histogram (+CountCalls)") \
2569 \
2570 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2571 "# of interpreted methods to show in profile") \
2572 \
2573 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2574 "# of compiled methods to show in profile") \
2575 \
2576 develop(intx, ProfilerNumberOfStubMethods, 25, \
2577 "# of stub methods to show in profile") \
2578 \
2579 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2580 "# of runtime stub nodes to show in profile") \
2581 \
2582 product(intx, ProfileIntervalsTicks, 100, \
2583 "# of ticks between printing of interval profile " \
2584 "(+ProfileIntervals)") \
2585 \
2586 notproduct(intx, ScavengeALotInterval, 1, \
2587 "Interval between which scavenge will occur with +ScavengeALot") \
2588 \
2589 notproduct(intx, FullGCALotInterval, 1, \
2590 "Interval between which full gc will occur with +FullGCALot") \
2591 \
2592 notproduct(intx, FullGCALotStart, 0, \
2593 "For which invocation to start FullGCAlot") \
2594 \
2595 notproduct(intx, FullGCALotDummies, 32*K, \
2596 "Dummy object allocated with +FullGCALot, forcing all objects " \
2597 "to move") \
2598 \
2599 develop(intx, DontYieldALotInterval, 10, \
2600 "Interval between which yields will be dropped (milliseconds)") \
2601 \
2602 develop(intx, MinSleepInterval, 1, \
2603 "Minimum sleep() interval (milliseconds) when " \
2604 "ConvertSleepToYield is off (used for SOLARIS)") \
2605 \
2606 product(intx, EventLogLength, 2000, \
2607 "maximum nof events in event log") \
2608 \
2609 develop(intx, ProfilerPCTickThreshold, 15, \
2610 "Number of ticks in a PC buckets to be a hotspot") \
2611 \
2612 notproduct(intx, DeoptimizeALotInterval, 5, \
2613 "Number of exits until DeoptimizeALot kicks in") \
2614 \
2615 notproduct(intx, ZombieALotInterval, 5, \
2616 "Number of exits until ZombieALot kicks in") \
2617 \
2618 develop(bool, StressNonEntrant, false, \
2619 "Mark nmethods non-entrant at registration") \
2620 \
2621 diagnostic(intx, MallocVerifyInterval, 0, \
2622 "if non-zero, verify C heap after every N calls to " \
2623 "malloc/realloc/free") \
2624 \
2625 diagnostic(intx, MallocVerifyStart, 0, \
2626 "if non-zero, start verifying C heap after Nth call to " \
2627 "malloc/realloc/free") \
2628 \
2629 product(intx, TypeProfileWidth, 2, \
2630 "number of receiver types to record in call/cast profile") \
2631 \
2632 develop(intx, BciProfileWidth, 2, \
2633 "number of return bci's to record in ret profile") \
2634 \
2635 product(intx, PerMethodRecompilationCutoff, 400, \
2636 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2637 \
2638 product(intx, PerBytecodeRecompilationCutoff, 100, \
2639 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2640 \
2641 product(intx, PerMethodTrapLimit, 100, \
2642 "Limit on traps (of one kind) in a method (includes inlines)") \
2643 \
2644 product(intx, PerBytecodeTrapLimit, 4, \
2645 "Limit on traps (of one kind) at a particular BCI") \
2646 \
2647 develop(intx, FreqCountInvocations, 1, \
2648 "Scaling factor for branch frequencies (deprecated)") \
2649 \
2650 develop(intx, InlineFrequencyRatio, 20, \
2651 "Ratio of call site execution to caller method invocation") \
2652 \
2653 develop_pd(intx, InlineFrequencyCount, \
2654 "Count of call site execution necessary to trigger frequent " \
2655 "inlining") \
2656 \
2657 develop(intx, InlineThrowCount, 50, \
2658 "Force inlining of interpreted methods that throw this often") \
2659 \
2660 develop(intx, InlineThrowMaxSize, 200, \
2661 "Force inlining of throwing methods smaller than this") \
2662 \
2663 product(intx, AliasLevel, 3, \
2664 "0 for no aliasing, 1 for oop/field/static/array split, " \
2665 "2 for class split, 3 for unique instances") \
2666 \
2667 develop(bool, VerifyAliases, false, \
2668 "perform extra checks on the results of alias analysis") \
2669 \
2670 develop(intx, ProfilerNodeSize, 1024, \
2671 "Size in K to allocate for the Profile Nodes of each thread") \
2672 \
2673 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
2674 "Number of times to spin wait on a v8 atomic operation lock") \
2675 \
2676 product(intx, ReadSpinIterations, 100, \
2677 "Number of read attempts before a yield (spin inner loop)") \
2678 \
2679 product_pd(intx, PreInflateSpin, \
2680 "Number of times to spin wait before inflation") \
2681 \
2682 product(intx, PreBlockSpin, 10, \
2683 "Number of times to spin in an inflated lock before going to " \
2684 "an OS lock") \
2685 \
2686 /* gc parameters */ \
2687 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \
2688 "Default maximum size for object heap (in bytes)") \
2689 \
2690 product_pd(uintx, NewSize, \
2691 "Default size of new generation (in bytes)") \
2692 \
2693 product(uintx, MaxNewSize, max_uintx, \
2694 "Maximum size of new generation (in bytes)") \
2695 \
2696 product(uintx, PretenureSizeThreshold, 0, \
2697 "Max size in bytes of objects allocated in DefNew generation") \
2698 \
2699 product_pd(uintx, TLABSize, \
2700 "Default (or starting) size of TLAB (in bytes)") \
2701 \
2702 product(uintx, MinTLABSize, 2*K, \
2703 "Minimum allowed TLAB size (in bytes)") \
2704 \
2705 product(uintx, TLABAllocationWeight, 35, \
2706 "Allocation averaging weight") \
2707 \
2708 product(uintx, TLABWasteTargetPercent, 1, \
2709 "Percentage of Eden that can be wasted") \
2710 \
2711 product(uintx, TLABRefillWasteFraction, 64, \
2712 "Max TLAB waste at a refill (internal fragmentation)") \
2713 \
2714 product(uintx, TLABWasteIncrement, 4, \
2715 "Increment allowed waste at slow allocation") \
2716 \
2717 product_pd(intx, SurvivorRatio, \
2718 "Ratio of eden/survivor space size") \
2719 \
2720 product_pd(intx, NewRatio, \
2721 "Ratio of new/old generation sizes") \
2722 \
2723 product(uintx, MaxLiveObjectEvacuationRatio, 100, \
2724 "Max percent of eden objects that will be live at scavenge") \
2725 \
2726 product_pd(uintx, NewSizeThreadIncrease, \
2727 "Additional size added to desired new generation size per " \
2728 "non-daemon thread (in bytes)") \
2729 \
2730 product(uintx, OldSize, ScaleForWordSize(4096*K), \
2731 "Default size of tenured generation (in bytes)") \
2732 \
2733 product_pd(uintx, PermSize, \
2734 "Default size of permanent generation (in bytes)") \
2735 \
2736 product_pd(uintx, MaxPermSize, \
2737 "Maximum size of permanent generation (in bytes)") \
2738 \
2739 product(uintx, MinHeapFreeRatio, 40, \
2740 "Min percentage of heap free after GC to avoid expansion") \
2741 \
2742 product(uintx, MaxHeapFreeRatio, 70, \
2743 "Max percentage of heap free after GC to avoid shrinking") \
2744 \
2745 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
2746 "Number of milliseconds per MB of free space in the heap") \
2747 \
2748 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
2749 "Min change in heap space due to GC (in bytes)") \
2750 \
2751 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
2752 "Min expansion of permanent heap (in bytes)") \
2753 \
2754 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
2755 "Max expansion of permanent heap without full GC (in bytes)") \
2756 \
2757 product(intx, QueuedAllocationWarningCount, 0, \
2758 "Number of times an allocation that queues behind a GC " \
2759 "will retry before printing a warning") \
2760 \
2761 diagnostic(uintx, VerifyGCStartAt, 0, \
2762 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
2763 \
2764 diagnostic(intx, VerifyGCLevel, 0, \
2765 "Generation level at which to start +VerifyBefore/AfterGC") \
2766 \
2767 develop(uintx, ExitAfterGCNum, 0, \
2768 "If non-zero, exit after this GC.") \
2769 \
2770 product(intx, MaxTenuringThreshold, 15, \
2771 "Maximum value for tenuring threshold") \
2772 \
2773 product(intx, InitialTenuringThreshold, 7, \
2774 "Initial value for tenuring threshold") \
2775 \
2776 product(intx, TargetSurvivorRatio, 50, \
2777 "Desired percentage of survivor space used after scavenge") \
2778 \
2779 product(intx, MarkSweepDeadRatio, 5, \
2780 "Percentage (0-100) of the old gen allowed as dead wood." \
2781 "Serial mark sweep treats this as both the min and max value." \
2782 "CMS uses this value only if it falls back to mark sweep." \
2783 "Par compact uses a variable scale based on the density of the" \
2784 "generation and treats this as the max value when the heap is" \
2785 "either completely full or completely empty. Par compact also" \
2786 "has a smaller default value; see arguments.cpp.") \
2787 \
2788 product(intx, PermMarkSweepDeadRatio, 20, \
2789 "Percentage (0-100) of the perm gen allowed as dead wood." \
2790 "See MarkSweepDeadRatio for collector-specific comments.") \
2791 \
2792 product(intx, MarkSweepAlwaysCompactCount, 4, \
2793 "How often should we fully compact the heap (ignoring the dead " \
2794 "space parameters)") \
2795 \
2796 product(intx, PrintCMSStatistics, 0, \
2797 "Statistics for CMS") \
2798 \
2799 product(bool, PrintCMSInitiationStatistics, false, \
2800 "Statistics for initiating a CMS collection") \
2801 \
2802 product(intx, PrintFLSStatistics, 0, \
2803 "Statistics for CMS' FreeListSpace") \
2804 \
2805 product(intx, PrintFLSCensus, 0, \
2806 "Census for CMS' FreeListSpace") \
2807 \
2808 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
2809 "Delay in ms between expansion and allocation") \
2810 \
2811 product(intx, DeferThrSuspendLoopCount, 4000, \
2812 "(Unstable) Number of times to iterate in safepoint loop " \
2813 " before blocking VM threads ") \
2814 \
2815 product(intx, DeferPollingPageLoopCount, -1, \
2816 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
2817 "before changing safepoint polling page to RO ") \
2818 \
2819 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
2820 \
2821 product(bool, UseDepthFirstScavengeOrder, true, \
2822 "true: the scavenge order will be depth-first, " \
2823 "false: the scavenge order will be breadth-first") \
2824 \
2825 product(bool, PSChunkLargeArrays, true, \
2826 "true: process large arrays in chunks") \
2827 \
2828 product(uintx, GCDrainStackTargetSize, 64, \
2829 "how many entries we'll try to leave on the stack during " \
2830 "parallel GC") \
2831 \
2832 product(intx, DCQBarrierQueueBufferSize, 256, \
2833 "Number of elements in a dirty card queue buffer") \
2834 \
2835 product(intx, DCQBarrierProcessCompletedThreshold, 5, \
2836 "Number of completed dirty card buffers to trigger processing.") \
2837 \
2838 /* stack parameters */ \
2839 product_pd(intx, StackYellowPages, \
2840 "Number of yellow zone (recoverable overflows) pages") \
2841 \
2842 product_pd(intx, StackRedPages, \
2843 "Number of red zone (unrecoverable overflows) pages") \
2844 \
2845 product_pd(intx, StackShadowPages, \
2846 "Number of shadow zone (for overflow checking) pages" \
2847 " this should exceed the depth of the VM and native call stack") \
2848 \
2849 product_pd(intx, ThreadStackSize, \
2850 "Thread Stack Size (in Kbytes)") \
2851 \
2852 product_pd(intx, VMThreadStackSize, \
2853 "Non-Java Thread Stack Size (in Kbytes)") \
2854 \
2855 product_pd(intx, CompilerThreadStackSize, \
2856 "Compiler Thread Stack Size (in Kbytes)") \
2857 \
2858 develop_pd(uintx, JVMInvokeMethodSlack, \
2859 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
2860 \
2861 product(uintx, ThreadSafetyMargin, 50*M, \
2862 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
2863 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
2864 "disable this feature") \
2865 \
2866 /* code cache parameters */ \
2867 develop(uintx, CodeCacheSegmentSize, 64, \
2868 "Code cache segment size (in bytes) - smallest unit of " \
2869 "allocation") \
2870 \
2871 develop_pd(intx, CodeEntryAlignment, \
2872 "Code entry alignment for generated code (in bytes)") \
2873 \
2874 product_pd(uintx, InitialCodeCacheSize, \
2875 "Initial code cache size (in bytes)") \
2876 \
2877 product_pd(uintx, ReservedCodeCacheSize, \
2878 "Reserved code cache size (in bytes) - maximum code cache size") \
2879 \
2880 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
2881 "When less than X space left, we stop compiling.") \
2882 \
2883 product_pd(uintx, CodeCacheExpansionSize, \
2884 "Code cache expansion size (in bytes)") \
2885 \
2886 develop_pd(uintx, CodeCacheMinBlockLength, \
2887 "Minimum number of segments in a code cache block.") \
2888 \
2889 notproduct(bool, ExitOnFullCodeCache, false, \
2890 "Exit the VM if we fill the code cache.") \
2891 \
2892 /* interpreter debugging */ \
2893 develop(intx, BinarySwitchThreshold, 5, \
2894 "Minimal number of lookupswitch entries for rewriting to binary " \
2895 "switch") \
2896 \
2897 develop(intx, StopInterpreterAt, 0, \
2898 "Stops interpreter execution at specified bytecode number") \
2899 \
2900 develop(intx, TraceBytecodesAt, 0, \
2901 "Traces bytecodes starting with specified bytecode number") \
2902 \
2903 /* compiler interface */ \
2904 develop(intx, CIStart, 0, \
2905 "the id of the first compilation to permit") \
2906 \
2907 develop(intx, CIStop, -1, \
2908 "the id of the last compilation to permit") \
2909 \
2910 develop(intx, CIStartOSR, 0, \
2911 "the id of the first osr compilation to permit " \
2912 "(CICountOSR must be on)") \
2913 \
2914 develop(intx, CIStopOSR, -1, \
2915 "the id of the last osr compilation to permit " \
2916 "(CICountOSR must be on)") \
2917 \
2918 develop(intx, CIBreakAtOSR, -1, \
2919 "id of osr compilation to break at") \
2920 \
2921 develop(intx, CIBreakAt, -1, \
2922 "id of compilation to break at") \
2923 \
2924 product(ccstrlist, CompileOnly, "", \
2925 "List of methods (pkg/class.name) to restrict compilation to") \
2926 \
2927 product(ccstr, CompileCommandFile, NULL, \
2928 "Read compiler commands from this file [.hotspot_compiler]") \
2929 \
2930 product(ccstrlist, CompileCommand, "", \
2931 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2932 \
2933 product(bool, CICompilerCountPerCPU, false, \
2934 "1 compiler thread for log(N CPUs)") \
2935 \
2936 develop(intx, CIFireOOMAt, -1, \
2937 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
2938 "(non-negative value throws OOM after this many CI accesses " \
2939 "in each compile)") \
2940 \
2941 develop(intx, CIFireOOMAtDelay, -1, \
2942 "Wait for this many CI accesses to occur in all compiles before " \
2943 "beginning to throw OutOfMemoryErrors in each compile") \
2944 \
2945 /* Priorities */ \
2946 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
2947 \
2948 product(intx, ThreadPriorityPolicy, 0, \
2949 "0 : Normal. "\
2950 " VM chooses priorities that are appropriate for normal "\
2951 " applications. On Solaris NORM_PRIORITY and above are mapped "\
2952 " to normal native priority. Java priorities below NORM_PRIORITY"\
2953 " map to lower native priority values. On Windows applications"\
2954 " are allowed to use higher native priorities. However, with "\
2955 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
2956 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
2957 " interfere with system threads. On Linux thread priorities "\
2958 " are ignored because the OS does not support static priority "\
2959 " in SCHED_OTHER scheduling class which is the only choice for"\
2960 " non-root, non-realtime applications. "\
2961 "1 : Aggressive. "\
2962 " Java thread priorities map over to the entire range of "\
2963 " native thread priorities. Higher Java thread priorities map "\
2964 " to higher native thread priorities. This policy should be "\
2965 " used with care, as sometimes it can cause performance "\
2966 " degradation in the application and/or the entire system. On "\
2967 " Linux this policy requires root privilege.") \
2968 \
2969 product(bool, ThreadPriorityVerbose, false, \
2970 "print priority changes") \
2971 \
2972 product(intx, DefaultThreadPriority, -1, \
2973 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
2974 \
2975 product(intx, CompilerThreadPriority, -1, \
2976 "what priority should compiler threads run at (-1 means no change)") \
2977 \
2978 product(intx, VMThreadPriority, -1, \
2979 "what priority should VM threads run at (-1 means no change)") \
2980 \
2981 product(bool, CompilerThreadHintNoPreempt, true, \
2982 "(Solaris only) Give compiler threads an extra quanta") \
2983 \
2984 product(bool, VMThreadHintNoPreempt, false, \
2985 "(Solaris only) Give VM thread an extra quanta") \
2986 \
2987 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2988 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2989 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2990 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2991 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2992 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2993 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2994 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2995 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2996 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
2997 \
2998 /* compiler debugging */ \
2999 notproduct(intx, CompileTheWorldStartAt, 1, \
3000 "First class to consider when using +CompileTheWorld") \
3001 \
3002 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3003 "Last class to consider when using +CompileTheWorld") \
3004 \
3005 develop(intx, NewCodeParameter, 0, \
3006 "Testing Only: Create a dedicated integer parameter before " \
3007 "putback") \
3008 \
3009 /* new oopmap storage allocation */ \
3010 develop(intx, MinOopMapAllocation, 8, \
3011 "Minimum number of OopMap entries in an OopMapSet") \
3012 \
3013 /* Background Compilation */ \
3014 develop(intx, LongCompileThreshold, 50, \
3015 "Used with +TraceLongCompiles") \
3016 \
3017 product(intx, StarvationMonitorInterval, 200, \
3018 "Pause between each check in ms") \
3019 \
3020 /* recompilation */ \
3021 product_pd(intx, CompileThreshold, \
3022 "number of interpreted method invocations before (re-)compiling") \
3023 \
3024 product_pd(intx, BackEdgeThreshold, \
3025 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3026 \
3027 product(intx, Tier1BytecodeLimit, 10, \
3028 "Must have at least this many bytecodes before tier1" \
3029 "invocation counters are used") \
3030 \
3031 product_pd(intx, Tier2CompileThreshold, \
3032 "threshold at which a tier 2 compilation is invoked") \
3033 \
3034 product_pd(intx, Tier2BackEdgeThreshold, \
3035 "Back edge threshold at which a tier 2 compilation is invoked") \
3036 \
3037 product_pd(intx, Tier3CompileThreshold, \
3038 "threshold at which a tier 3 compilation is invoked") \
3039 \
3040 product_pd(intx, Tier3BackEdgeThreshold, \
3041 "Back edge threshold at which a tier 3 compilation is invoked") \
3042 \
3043 product_pd(intx, Tier4CompileThreshold, \
3044 "threshold at which a tier 4 compilation is invoked") \
3045 \
3046 product_pd(intx, Tier4BackEdgeThreshold, \
3047 "Back edge threshold at which a tier 4 compilation is invoked") \
3048 \
3049 product_pd(bool, TieredCompilation, \
3050 "Enable two-tier compilation") \
3051 \
3052 product(bool, StressTieredRuntime, false, \
3053 "Alternate client and server compiler on compile requests") \
3054 \
3055 product_pd(intx, OnStackReplacePercentage, \
3056 "NON_TIERED number of method invocations/branches (expressed as %"\
3057 "of CompileThreshold) before (re-)compiling OSR code") \
3058 \
3059 product(intx, InterpreterProfilePercentage, 33, \
3060 "NON_TIERED number of method invocations/branches (expressed as %"\
3061 "of CompileThreshold) before profiling in the interpreter") \
3062 \
3063 develop(intx, MaxRecompilationSearchLength, 10, \
3064 "max. # frames to inspect searching for recompilee") \
3065 \
3066 develop(intx, MaxInterpretedSearchLength, 3, \
3067 "max. # interp. frames to skip when searching for recompilee") \
3068 \
3069 develop(intx, DesiredMethodLimit, 8000, \
3070 "desired max. method size (in bytecodes) after inlining") \
3071 \
3072 develop(intx, HugeMethodLimit, 8000, \
3073 "don't compile methods larger than this if " \
3074 "+DontCompileHugeMethods") \
3075 \
3076 /* New JDK 1.4 reflection implementation */ \
3077 \
3078 develop(bool, UseNewReflection, true, \
3079 "Temporary flag for transition to reflection based on dynamic " \
3080 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3081 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3082 "changes were needed") \
3083 \
3084 develop(bool, VerifyReflectionBytecodes, false, \
3085 "Force verification of 1.4 reflection bytecodes. Does not work " \
3086 "in situations like that described in 4486457 or for " \
3087 "constructors generated for serialization, so can not be enabled "\
3088 "in product.") \
3089 \
3090 product(bool, ReflectionWrapResolutionErrors, true, \
3091 "Temporary flag for transition to AbstractMethodError wrapped " \
3092 "in InvocationTargetException. See 6531596") \
3093 \
3094 \
3095 develop(intx, FastSuperclassLimit, 8, \
3096 "Depth of hardwired instanceof accelerator array") \
3097 \
3098 /* Properties for Java libraries */ \
3099 \
3100 product(intx, MaxDirectMemorySize, -1, \
3101 "Maximum total size of NIO direct-buffer allocations") \
3102 \
3103 /* temporary developer defined flags */ \
3104 \
3105 diagnostic(bool, UseNewCode, false, \
3106 "Testing Only: Use the new version while testing") \
3107 \
3108 diagnostic(bool, UseNewCode2, false, \
3109 "Testing Only: Use the new version while testing") \
3110 \
3111 diagnostic(bool, UseNewCode3, false, \
3112 "Testing Only: Use the new version while testing") \
3113 \
3114 /* flags for performance data collection */ \
3115 \
3116 product(bool, UsePerfData, true, \
3117 "Flag to disable jvmstat instrumentation for performance testing" \
3118 "and problem isolation purposes.") \
3119 \
3120 product(bool, PerfDataSaveToFile, false, \
3121 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3122 \
3123 product(ccstr, PerfDataSaveFile, NULL, \
3124 "Save PerfData memory to the specified absolute pathname," \
3125 "%p in the file name if present will be replaced by pid") \
3126 \
3127 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3128 "Data sampling interval in milliseconds") \
3129 \
3130 develop(bool, PerfTraceDataCreation, false, \
3131 "Trace creation of Performance Data Entries") \
3132 \
3133 develop(bool, PerfTraceMemOps, false, \
3134 "Trace PerfMemory create/attach/detach calls") \
3135 \
3136 product(bool, PerfDisableSharedMem, false, \
3137 "Store performance data in standard memory") \
3138 \
3139 product(intx, PerfDataMemorySize, 32*K, \
3140 "Size of performance data memory region. Will be rounded " \
3141 "up to a multiple of the native os page size.") \
3142 \
3143 product(intx, PerfMaxStringConstLength, 1024, \
3144 "Maximum PerfStringConstant string length before truncation") \
3145 \
3146 product(bool, PerfAllowAtExitRegistration, false, \
3147 "Allow registration of atexit() methods") \
3148 \
3149 product(bool, PerfBypassFileSystemCheck, false, \
3150 "Bypass Win32 file system criteria checks (Windows Only)") \
3151 \
3152 product(intx, UnguardOnExecutionViolation, 0, \
3153 "Unguard page and retry on no-execute fault (Win32 only)" \
3154 "0=off, 1=conservative, 2=aggressive") \
3155 \
3156 /* Serviceability Support */ \
3157 \
3158 product(bool, ManagementServer, false, \
3159 "Create JMX Management Server") \
3160 \
3161 product(bool, DisableAttachMechanism, false, \
3162 "Disable mechanism that allows tools to attach to this VM") \
3163 \
3164 product(bool, StartAttachListener, false, \
3165 "Always start Attach Listener at VM startup") \
3166 \
3167 manageable(bool, PrintConcurrentLocks, false, \
3168 "Print java.util.concurrent locks in thread dump") \
3169 \
3170 /* Shared spaces */ \
3171 \
3172 product(bool, UseSharedSpaces, true, \
3173 "Use shared spaces in the permanent generation") \
3174 \
3175 product(bool, RequireSharedSpaces, false, \
3176 "Require shared spaces in the permanent generation") \
3177 \
3178 product(bool, ForceSharedSpaces, false, \
3179 "Require shared spaces in the permanent generation") \
3180 \
3181 product(bool, DumpSharedSpaces, false, \
3182 "Special mode: JVM reads a class list, loads classes, builds " \
3183 "shared spaces, and dumps the shared spaces to a file to be " \
3184 "used in future JVM runs.") \
3185 \
3186 product(bool, PrintSharedSpaces, false, \
3187 "Print usage of shared spaces") \
3188 \
3189 product(uintx, SharedDummyBlockSize, 512*M, \
3190 "Size of dummy block used to shift heap addresses (in bytes)") \
3191 \
3192 product(uintx, SharedReadWriteSize, 12*M, \
3193 "Size of read-write space in permanent generation (in bytes)") \
3194 \
3195 product(uintx, SharedReadOnlySize, 8*M, \
3196 "Size of read-only space in permanent generation (in bytes)") \
3197 \
3198 product(uintx, SharedMiscDataSize, 4*M, \
3199 "Size of the shared data area adjacent to the heap (in bytes)") \
3200 \
3201 product(uintx, SharedMiscCodeSize, 4*M, \
3202 "Size of the shared code area adjacent to the heap (in bytes)") \
3203 \
3204 diagnostic(bool, SharedOptimizeColdStart, true, \
3205 "At dump time, order shared objects to achieve better " \
3206 "cold startup time.") \
3207 \
3208 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3209 "Reordering policy for SharedOptimizeColdStart " \
3210 "0=favor classload-time locality, 1=balanced, " \
3211 "2=favor runtime locality") \
3212 \
3213 diagnostic(bool, SharedSkipVerify, false, \
3214 "Skip assert() and verify() which page-in unwanted shared " \
3215 "objects. ") \
3216 \
3217 product(bool, TaggedStackInterpreter, false, \
3218 "Insert tags in interpreter execution stack for oopmap generaion")\
3219 \
3220 diagnostic(bool, PauseAtStartup, false, \
3221 "Causes the VM to pause at startup time and wait for the pause " \
3222 "file to be removed (default: ./vm.paused.<pid>)") \
3223 \
3224 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3225 "The file to create and for whose removal to await when pausing " \
3226 "at startup. (default: ./vm.paused.<pid>)") \
3227 \
3228 product(bool, ExtendedDTraceProbes, false, \
3229 "Enable performance-impacting dtrace probes") \
3230 \
3231 product(bool, DTraceMethodProbes, false, \
3232 "Enable dtrace probes for method-entry and method-exit") \
3233 \
3234 product(bool, DTraceAllocProbes, false, \
3235 "Enable dtrace probes for object allocation") \
3236 \
3237 product(bool, DTraceMonitorProbes, false, \
3238 "Enable dtrace probes for monitor events") \
3239 \
3240 product(bool, RelaxAccessControlCheck, false, \
3241 "Relax the access control checks in the verifier") \
3242 \
3243 diagnostic(bool, PrintDTraceDOF, false, \
3244 "Print the DTrace DOF passed to the system for JSDT probes") \
3245 \
3246 product(bool, UseVMInterruptibleIO, true, \
3247 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3248 "EINTR for I/O operations results in OS_INTRPT")
3251 /*
3252 * Macros for factoring of globals
3253 */
3255 // Interface macros
3256 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3257 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3258 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3259 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3260 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3261 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3262 #ifdef PRODUCT
3263 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3264 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3265 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3266 #else
3267 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3268 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3269 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3270 #endif
3271 // Special LP64 flags, product only needed for now.
3272 #ifdef _LP64
3273 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3274 #else
3275 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3276 #endif // _LP64
3278 // Implementation macros
3279 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3280 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3281 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3282 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3283 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3284 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3285 #ifdef PRODUCT
3286 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3287 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3288 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3289 #else
3290 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3291 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3292 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3293 #endif
3294 #ifdef _LP64
3295 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3296 #else
3297 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3298 #endif // _LP64
3300 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)
3302 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
