1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #if !defined(COMPILER1) && !defined(COMPILER2)
26 define_pd_global(bool, BackgroundCompilation, false);
27 define_pd_global(bool, UseTLAB, false);
28 define_pd_global(bool, CICompileOSR, false);
29 define_pd_global(bool, UseTypeProfile, false);
30 define_pd_global(bool, UseOnStackReplacement, false);
31 define_pd_global(bool, InlineIntrinsics, false);
32 define_pd_global(bool, PreferInterpreterNativeStubs, true);
33 define_pd_global(bool, ProfileInterpreter, false);
34 define_pd_global(bool, ProfileTraps, false);
35 define_pd_global(bool, TieredCompilation, false);
36
37 define_pd_global(intx, CompileThreshold, 0);
38 define_pd_global(intx, Tier2CompileThreshold, 0);
39 define_pd_global(intx, Tier3CompileThreshold, 0);
40 define_pd_global(intx, Tier4CompileThreshold, 0);
41
42 define_pd_global(intx, BackEdgeThreshold, 0);
43 define_pd_global(intx, Tier2BackEdgeThreshold, 0);
44 define_pd_global(intx, Tier3BackEdgeThreshold, 0);
45 define_pd_global(intx, Tier4BackEdgeThreshold, 0);
46
47 define_pd_global(intx, OnStackReplacePercentage, 0);
48 define_pd_global(bool, ResizeTLAB, false);
49 define_pd_global(intx, FreqInlineSize, 0);
50 define_pd_global(intx, 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
64
65 #ifdef COMPILER2
66 #define CI_COMPILER_COUNT 2
67 #else
68 #define CI_COMPILER_COUNT 1
69 #endif // COMPILER2
70
71 #endif // no compilers
72
73
74 // string type aliases used only in this file
75 typedef const char* ccstr;
76 typedef const char* ccstrlist; // represents string arguments which accumulate
77
78 enum FlagValueOrigin {
79 DEFAULT = 0,
80 COMMAND_LINE = 1,
81 ENVIRON_VAR = 2,
82 CONFIG_FILE = 3,
83 MANAGEMENT = 4,
84 ERGONOMIC = 5,
85 ATTACH_ON_DEMAND = 6,
86 INTERNAL = 99
87 };
88
89 struct Flag {
90 const char *type;
91 const char *name;
92 void* addr;
93 const char *kind;
94 FlagValueOrigin origin;
95
96 // points to all Flags static array
97 static Flag *flags;
98
99 // number of flags
100 static size_t numFlags;
101
102 static Flag* find_flag(char* name, size_t length);
103
104 bool is_bool() const { return strcmp(type, "bool") == 0; }
105 bool get_bool() const { return *((bool*) addr); }
106 void set_bool(bool value) { *((bool*) addr) = value; }
107
108 bool is_intx() const { return strcmp(type, "intx") == 0; }
109 intx get_intx() const { return *((intx*) addr); }
110 void set_intx(intx value) { *((intx*) addr) = value; }
111
112 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
113 uintx get_uintx() const { return *((uintx*) addr); }
114 void set_uintx(uintx value) { *((uintx*) addr) = value; }
115
116 bool is_double() const { return strcmp(type, "double") == 0; }
117 double get_double() const { return *((double*) addr); }
118 void set_double(double value) { *((double*) addr) = value; }
119
120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
122 ccstr get_ccstr() const { return *((ccstr*) addr); }
123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
124
125 bool is_unlocker() const;
126 bool is_unlocked() const;
127 bool is_writeable() const;
128 bool is_external() const;
129
130 void print_on(outputStream* st);
131 void print_as_flag(outputStream* st);
132 };
133
134 // debug flags control various aspects of the VM and are global accessible
135
136 // use FlagSetting to temporarily change some debug flag
137 // e.g. FlagSetting fs(DebugThisAndThat, true);
138 // restored to previous value upon leaving scope
139 class FlagSetting {
140 bool val;
141 bool* flag;
142 public:
143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
144 ~FlagSetting() { *flag = val; }
145 };
146
147
148 class CounterSetting {
149 intx* counter;
150 public:
151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
152 ~CounterSetting() { (*counter)--; }
153 };
154
155
156 class IntFlagSetting {
157 intx val;
158 intx* flag;
159 public:
160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
161 ~IntFlagSetting() { *flag = val; }
162 };
163
164
165 class DoubleFlagSetting {
166 double val;
167 double* flag;
168 public:
169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
170 ~DoubleFlagSetting() { *flag = val; }
171 };
172
173
174 class CommandLineFlags {
175 public:
176 static bool boolAt(char* name, size_t len, bool* value);
177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
180
181 static bool intxAt(char* name, size_t len, intx* value);
182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
185
186 static bool uintxAt(char* name, size_t len, uintx* value);
187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
190
191 static bool 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); }
195
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); }
200
201 // Returns false if name is not a command line flag.
202 static bool wasSetOnCmdline(const char* name, bool* value);
203 static void printSetFlags();
204
205 static void printFlags() PRODUCT_RETURN;
206
207 static void verify() PRODUCT_RETURN;
208 };
209
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
219
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
229
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
239
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
243
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.
248
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.
299
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 product(bool, UseImplicitNullCheckForNarrowOop, true, \
310 "generate implicit null check in indexed addressing mode.") \
311 \
312 /* UseMembar is theoretically a temp flag used for memory barrier \
313 * removal testing. It was supposed to be removed before FCS but has \
314 * been re-added (see 6401008) */ \
315 product(bool, UseMembar, false, \
316 "(Unstable) Issues membars on thread state transitions") \
317 \
318 product(bool, PrintCommandLineFlags, false, \
319 "Prints flags that appeared on the command line") \
320 \
321 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
322 "Enable normal processing of flags relating to field diagnostics")\
323 \
324 experimental(bool, UnlockExperimentalVMOptions, false, \
325 "Enable normal processing of flags relating to experimental features")\
326 \
327 product(bool, JavaMonitorsInStackTrace, true, \
328 "Print info. about Java monitor locks when the stacks are dumped")\
329 \
330 product_pd(bool, UseLargePages, \
331 "Use large page memory") \
332 \
333 develop(bool, TracePageSizes, false, \
334 "Trace page size selection and usage.") \
335 \
336 product(bool, UseNUMA, false, \
337 "Use NUMA if available") \
338 \
339 product(intx, NUMAChunkResizeWeight, 20, \
340 "Percentage (0-100) used to weight the current sample when " \
341 "computing exponentially decaying average for " \
342 "AdaptiveNUMAChunkSizing") \
343 \
344 product(intx, NUMASpaceResizeRate, 1*G, \
345 "Do not reallocate more that this amount per collection") \
346 \
347 product(bool, UseAdaptiveNUMAChunkSizing, true, \
348 "Enable adaptive chunk sizing for NUMA") \
349 \
350 product(bool, NUMAStats, false, \
351 "Print NUMA stats in detailed heap information") \
352 \
353 product(intx, NUMAPageScanRate, 256, \
354 "Maximum number of pages to include in the page scan procedure") \
355 \
356 product_pd(bool, NeedsDeoptSuspend, \
357 "True for register window machines (sparc/ia64)") \
358 \
359 product(intx, UseSSE, 99, \
360 "Highest supported SSE instructions set on x86/x64") \
361 \
362 product(uintx, LargePageSizeInBytes, 0, \
363 "Large page size (0 to let VM choose the page size") \
364 \
365 product(uintx, LargePageHeapSizeThreshold, 128*M, \
366 "Use large pages if max heap is at least this big") \
367 \
368 product(bool, ForceTimeHighResolution, false, \
369 "Using high time resolution(For Win32 only)") \
370 \
371 develop(bool, TraceItables, false, \
372 "Trace initialization and use of itables") \
373 \
374 develop(bool, TracePcPatching, false, \
375 "Trace usage of frame::patch_pc") \
376 \
377 develop(bool, TraceJumps, false, \
378 "Trace assembly jumps in thread ring buffer") \
379 \
380 develop(bool, TraceRelocator, false, \
381 "Trace the bytecode relocator") \
382 \
383 develop(bool, TraceLongCompiles, false, \
384 "Print out every time compilation is longer than " \
385 "a given threashold") \
386 \
387 develop(bool, SafepointALot, false, \
388 "Generates a lot of safepoints. Works with " \
389 "GuaranteedSafepointInterval") \
390 \
391 product_pd(bool, BackgroundCompilation, \
392 "A thread requesting compilation is not blocked during " \
393 "compilation") \
394 \
395 product(bool, PrintVMQWaitTime, false, \
396 "Prints out the waiting time in VM operation queue") \
397 \
398 develop(bool, BailoutToInterpreterForThrows, false, \
399 "Compiled methods which throws/catches exceptions will be " \
400 "deopt and intp.") \
401 \
402 develop(bool, NoYieldsInMicrolock, false, \
403 "Disable yields in microlock") \
404 \
405 develop(bool, TraceOopMapGeneration, false, \
406 "Shows oopmap generation") \
407 \
408 product(bool, MethodFlushing, true, \
409 "Reclamation of zombie and not-entrant methods") \
410 \
411 develop(bool, VerifyStack, false, \
412 "Verify stack of each thread when it is entering a runtime call") \
413 \
414 develop(bool, ForceUnreachable, false, \
415 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
416 \
417 notproduct(bool, StressDerivedPointers, false, \
418 "Force scavenge when a derived pointers is detected on stack " \
419 "after rtm call") \
420 \
421 develop(bool, TraceDerivedPointers, false, \
422 "Trace traversal of derived pointers on stack") \
423 \
424 notproduct(bool, TraceCodeBlobStacks, false, \
425 "Trace stack-walk of codeblobs") \
426 \
427 product(bool, PrintJNIResolving, false, \
428 "Used to implement -v:jni") \
429 \
430 notproduct(bool, PrintRewrites, false, \
431 "Print methods that are being rewritten") \
432 \
433 product(bool, UseInlineCaches, true, \
434 "Use Inline Caches for virtual calls ") \
435 \
436 develop(bool, InlineArrayCopy, true, \
437 "inline arraycopy native that is known to be part of " \
438 "base library DLL") \
439 \
440 develop(bool, InlineObjectHash, true, \
441 "inline Object::hashCode() native that is known to be part " \
442 "of base library DLL") \
443 \
444 develop(bool, InlineObjectCopy, true, \
445 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
446 \
447 develop(bool, InlineNatives, true, \
448 "inline natives that are known to be part of base library DLL") \
449 \
450 develop(bool, InlineMathNatives, true, \
451 "inline SinD, CosD, etc.") \
452 \
453 develop(bool, InlineClassNatives, true, \
454 "inline Class.isInstance, etc") \
455 \
456 develop(bool, InlineAtomicLong, true, \
457 "inline sun.misc.AtomicLong") \
458 \
459 develop(bool, InlineThreadNatives, true, \
460 "inline Thread.currentThread, etc") \
461 \
462 develop(bool, InlineReflectionGetCallerClass, true, \
463 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
464 "of base library DLL") \
465 \
466 develop(bool, InlineUnsafeOps, true, \
467 "inline memory ops (native methods) from sun.misc.Unsafe") \
468 \
469 develop(bool, ConvertCmpD2CmpF, true, \
470 "Convert cmpD to cmpF when one input is constant in float range") \
471 \
472 develop(bool, ConvertFloat2IntClipping, true, \
473 "Convert float2int clipping idiom to integer clipping") \
474 \
475 develop(bool, SpecialStringCompareTo, true, \
476 "special version of string compareTo") \
477 \
478 develop(bool, SpecialStringIndexOf, true, \
479 "special version of string indexOf") \
480 \
481 product(bool, SpecialArraysEquals, false, \
482 "special version of Arrays.equals(char[],char[])") \
483 \
484 develop(bool, TraceCallFixup, false, \
485 "traces all call fixups") \
486 \
487 develop(bool, DeoptimizeALot, false, \
488 "deoptimize at every exit from the runtime system") \
489 \
490 develop(ccstrlist, DeoptimizeOnlyAt, "", \
491 "a comma separated list of bcis to deoptimize at") \
492 \
493 product(bool, DeoptimizeRandom, false, \
494 "deoptimize random frames on random exit from the runtime system")\
495 \
496 notproduct(bool, ZombieALot, false, \
497 "creates zombies (non-entrant) at exit from the runt. system") \
498 \
499 notproduct(bool, WalkStackALot, false, \
500 "trace stack (no print) at every exit from the runtime system") \
501 \
502 develop(bool, Debugging, false, \
503 "set when executing debug methods in debug.ccp " \
504 "(to prevent triggering assertions)") \
505 \
506 notproduct(bool, StrictSafepointChecks, trueInDebug, \
507 "Enable strict checks that safepoints cannot happen for threads " \
508 "that used No_Safepoint_Verifier") \
509 \
510 notproduct(bool, VerifyLastFrame, false, \
511 "Verify oops on last frame on entry to VM") \
512 \
513 develop(bool, TraceHandleAllocation, false, \
514 "Prints out warnings when suspicious many handles are allocated") \
515 \
516 product(bool, UseCompilerSafepoints, true, \
517 "Stop at safepoints in compiled code") \
518 \
519 product(bool, UseSplitVerifier, true, \
520 "use split verifier with StackMapTable attributes") \
521 \
522 product(bool, FailOverToOldVerifier, true, \
523 "fail over to old verifier when split verifier fails") \
524 \
525 develop(bool, ShowSafepointMsgs, false, \
526 "Show msg. about safepoint synch.") \
527 \
528 product(bool, SafepointTimeout, false, \
529 "Time out and warn or fail after SafepointTimeoutDelay " \
530 "milliseconds if failed to reach safepoint") \
531 \
532 develop(bool, DieOnSafepointTimeout, false, \
533 "Die upon failure to reach safepoint (see SafepointTimeout)") \
534 \
535 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
536 /* typically, at most a few retries are needed */ \
537 product(intx, SuspendRetryCount, 50, \
538 "Maximum retry count for an external suspend request") \
539 \
540 product(intx, SuspendRetryDelay, 5, \
541 "Milliseconds to delay per retry (* current_retry_count)") \
542 \
543 product(bool, AssertOnSuspendWaitFailure, false, \
544 "Assert/Guarantee on external suspend wait failure") \
545 \
546 product(bool, TraceSuspendWaitFailures, false, \
547 "Trace external suspend wait failures") \
548 \
549 product(bool, MaxFDLimit, true, \
550 "Bump the number of file descriptors to max in solaris.") \
551 \
552 notproduct(bool, LogEvents, trueInDebug, \
553 "Enable Event log") \
554 \
555 product(bool, BytecodeVerificationRemote, true, \
556 "Enables the Java bytecode verifier for remote classes") \
557 \
558 product(bool, BytecodeVerificationLocal, false, \
559 "Enables the Java bytecode verifier for local classes") \
560 \
561 develop(bool, ForceFloatExceptions, trueInDebug, \
562 "Force exceptions on FP stack under/overflow") \
563 \
564 develop(bool, SoftMatchFailure, trueInProduct, \
565 "If the DFA fails to match a node, print a message and bail out") \
566 \
567 develop(bool, VerifyStackAtCalls, false, \
568 "Verify that the stack pointer is unchanged after calls") \
569 \
570 develop(bool, TraceJavaAssertions, false, \
571 "Trace java language assertions") \
572 \
573 notproduct(bool, CheckAssertionStatusDirectives, false, \
574 "temporary - see javaClasses.cpp") \
575 \
576 notproduct(bool, PrintMallocFree, false, \
577 "Trace calls to C heap malloc/free allocation") \
578 \
579 notproduct(bool, PrintOopAddress, false, \
580 "Always print the location of the oop") \
581 \
582 notproduct(bool, VerifyCodeCacheOften, false, \
583 "Verify compiled-code cache often") \
584 \
585 develop(bool, ZapDeadCompiledLocals, false, \
586 "Zap dead locals in compiler frames") \
587 \
588 notproduct(bool, ZapDeadLocalsOld, false, \
589 "Zap dead locals (old version, zaps all frames when " \
590 "entering the VM") \
591 \
592 notproduct(bool, CheckOopishValues, false, \
593 "Warn if value contains oop ( requires ZapDeadLocals)") \
594 \
595 develop(bool, UseMallocOnly, false, \
596 "use only malloc/free for allocation (no resource area/arena)") \
597 \
598 develop(bool, PrintMalloc, false, \
599 "print all malloc/free calls") \
600 \
601 develop(bool, ZapResourceArea, trueInDebug, \
602 "Zap freed resource/arena space with 0xABABABAB") \
603 \
604 notproduct(bool, ZapVMHandleArea, trueInDebug, \
605 "Zap freed VM handle space with 0xBCBCBCBC") \
606 \
607 develop(bool, ZapJNIHandleArea, trueInDebug, \
608 "Zap freed JNI handle space with 0xFEFEFEFE") \
609 \
610 develop(bool, ZapUnusedHeapArea, trueInDebug, \
611 "Zap unused heap space with 0xBAADBABE") \
612 \
613 develop(bool, TraceZapUnusedHeapArea, false, \
614 "Trace zapping of unused heap space") \
615 \
616 develop(bool, CheckZapUnusedHeapArea, false, \
617 "Check zapping of unused heap space") \
618 \
619 develop(bool, PrintVMMessages, true, \
620 "Print vm messages on console") \
621 \
622 product(bool, PrintGCApplicationConcurrentTime, false, \
623 "Print the time the application has been running") \
624 \
625 product(bool, PrintGCApplicationStoppedTime, false, \
626 "Print the time the application has been stopped") \
627 \
628 develop(bool, Verbose, false, \
629 "Prints additional debugging information from other modes") \
630 \
631 develop(bool, PrintMiscellaneous, false, \
632 "Prints uncategorized debugging information (requires +Verbose)") \
633 \
634 develop(bool, WizardMode, false, \
635 "Prints much more debugging information") \
636 \
637 product(bool, ShowMessageBoxOnError, false, \
638 "Keep process alive on VM fatal error") \
639 \
640 product_pd(bool, UseOSErrorReporting, \
641 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
642 \
643 product(bool, SuppressFatalErrorMessage, false, \
644 "Do NO Fatal Error report [Avoid deadlock]") \
645 \
646 product(ccstrlist, OnError, "", \
647 "Run user-defined commands on fatal error; see VMError.cpp " \
648 "for examples") \
649 \
650 product(ccstrlist, OnOutOfMemoryError, "", \
651 "Run user-defined commands on first java.lang.OutOfMemoryError") \
652 \
653 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
654 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
655 \
656 manageable(ccstr, HeapDumpPath, NULL, \
657 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
658 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
659 "in the working directory)") \
660 \
661 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
662 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
663 "when the heap usage is larger than this") \
664 \
665 develop(uintx, HeapDumpSegmentSize, 1*G, \
666 "Approximate segment size when generating a segmented heap dump") \
667 \
668 develop(bool, BreakAtWarning, false, \
669 "Execute breakpoint upon encountering VM warning") \
670 \
671 product_pd(bool, UseVectoredExceptions, \
672 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
673 \
674 develop(bool, TraceVMOperation, false, \
675 "Trace vm operations") \
676 \
677 develop(bool, UseFakeTimers, false, \
678 "Tells whether the VM should use system time or a fake timer") \
679 \
680 diagnostic(bool, LogCompilation, false, \
681 "Log compilation activity in detail to hotspot.log or LogFile") \
682 \
683 product(bool, PrintCompilation, false, \
684 "Print compilations") \
685 \
686 diagnostic(bool, TraceNMethodInstalls, false, \
687 "Trace nmethod intallation") \
688 \
689 diagnostic(bool, TraceOSRBreakpoint, false, \
690 "Trace OSR Breakpoint ") \
691 \
692 diagnostic(bool, TraceCompileTriggered, false, \
693 "Trace compile triggered") \
694 \
695 diagnostic(bool, TraceTriggers, false, \
696 "Trace triggers") \
697 \
698 product(bool, AlwaysRestoreFPU, false, \
699 "Restore the FPU control word after every JNI call (expensive)") \
700 \
701 notproduct(bool, PrintCompilation2, false, \
702 "Print additional statistics per compilation") \
703 \
704 diagnostic(bool, PrintAdapterHandlers, false, \
705 "Print code generated for i2c/c2i adapters") \
706 \
707 diagnostic(bool, PrintAssembly, false, \
708 "Print assembly code (using external disassembler.so)") \
709 \
710 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
711 "Options string passed to disassembler.so") \
712 \
713 diagnostic(bool, PrintNMethods, false, \
714 "Print assembly code for nmethods when generated") \
715 \
716 diagnostic(bool, PrintNativeNMethods, false, \
717 "Print assembly code for native nmethods when generated") \
718 \
719 develop(bool, PrintDebugInfo, false, \
720 "Print debug information for all nmethods when generated") \
721 \
722 develop(bool, PrintRelocations, false, \
723 "Print relocation information for all nmethods when generated") \
724 \
725 develop(bool, PrintDependencies, false, \
726 "Print dependency information for all nmethods when generated") \
727 \
728 develop(bool, PrintExceptionHandlers, false, \
729 "Print exception handler tables for all nmethods when generated") \
730 \
731 develop(bool, InterceptOSException, false, \
732 "Starts debugger when an implicit OS (e.g., NULL) " \
733 "exception happens") \
734 \
735 notproduct(bool, PrintCodeCache, false, \
736 "Print the compiled_code cache when exiting") \
737 \
738 develop(bool, PrintCodeCache2, false, \
739 "Print detailed info on the compiled_code cache when exiting") \
740 \
741 diagnostic(bool, PrintStubCode, false, \
742 "Print generated stub code") \
743 \
744 product(bool, StackTraceInThrowable, true, \
745 "Collect backtrace in throwable when exception happens") \
746 \
747 product(bool, OmitStackTraceInFastThrow, true, \
748 "Omit backtraces for some 'hot' exceptions in optimized code") \
749 \
750 product(bool, ProfilerPrintByteCodeStatistics, false, \
751 "Prints byte code statictics when dumping profiler output") \
752 \
753 product(bool, ProfilerRecordPC, false, \
754 "Collects tick for each 16 byte interval of compiled code") \
755 \
756 product(bool, ProfileVM, false, \
757 "Profiles ticks that fall within VM (either in the VM Thread " \
758 "or VM code called through stubs)") \
759 \
760 product(bool, ProfileIntervals, false, \
761 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
762 \
763 notproduct(bool, ProfilerCheckIntervals, false, \
764 "Collect and print info on spacing of profiler ticks") \
765 \
766 develop(bool, PrintJVMWarnings, false, \
767 "Prints warnings for unimplemented JVM functions") \
768 \
769 notproduct(uintx, WarnOnStalledSpinLock, 0, \
770 "Prints warnings for stalled SpinLocks") \
771 \
772 develop(bool, InitializeJavaLangSystem, true, \
773 "Initialize java.lang.System - turn off for individual " \
774 "method debugging") \
775 \
776 develop(bool, InitializeJavaLangString, true, \
777 "Initialize java.lang.String - turn off for individual " \
778 "method debugging") \
779 \
780 develop(bool, InitializeJavaLangExceptionsErrors, true, \
781 "Initialize various error and exception classes - turn off for " \
782 "individual method debugging") \
783 \
784 product(bool, RegisterFinalizersAtInit, true, \
785 "Register finalizable objects at end of Object.<init> or " \
786 "after allocation.") \
787 \
788 develop(bool, RegisterReferences, true, \
789 "Tells whether the VM should register soft/weak/final/phantom " \
790 "references") \
791 \
792 develop(bool, IgnoreRewrites, false, \
793 "Supress rewrites of bytecodes in the oopmap generator. " \
794 "This is unsafe!") \
795 \
796 develop(bool, PrintCodeCacheExtension, false, \
797 "Print extension of code cache") \
798 \
799 develop(bool, UsePrivilegedStack, true, \
800 "Enable the security JVM functions") \
801 \
802 develop(bool, IEEEPrecision, true, \
803 "Enables IEEE precision (for INTEL only)") \
804 \
805 develop(bool, ProtectionDomainVerification, true, \
806 "Verifies protection domain before resolution in system " \
807 "dictionary") \
808 \
809 product(bool, ClassUnloading, true, \
810 "Do unloading of classes") \
811 \
812 diagnostic(bool, LinkWellKnownClasses, true, \
813 "Resolve a well known class as soon as its name is seen") \
814 \
815 develop(bool, DisableStartThread, false, \
816 "Disable starting of additional Java threads " \
817 "(for debugging only)") \
818 \
819 develop(bool, MemProfiling, false, \
820 "Write memory usage profiling to log file") \
821 \
822 notproduct(bool, PrintSystemDictionaryAtExit, false, \
823 "Prints the system dictionary at exit") \
824 \
825 diagnostic(bool, UnsyncloadClass, false, \
826 "Unstable: VM calls loadClass unsynchronized. Custom classloader "\
827 "must call VM synchronized for findClass & defineClass") \
828 \
829 product_pd(bool, DontYieldALot, \
830 "Throw away obvious excess yield calls (for SOLARIS only)") \
831 \
832 product_pd(bool, ConvertSleepToYield, \
833 "Converts sleep(0) to thread yield " \
834 "(may be off for SOLARIS to improve GUI)") \
835 \
836 product(bool, ConvertYieldToSleep, false, \
837 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
838 "behavior (SOLARIS only)") \
839 \
840 product(bool, UseBoundThreads, true, \
841 "Bind user level threads to kernel threads (for SOLARIS only)") \
842 \
843 develop(bool, UseDetachedThreads, true, \
844 "Use detached threads that are recycled upon termination " \
845 "(for SOLARIS only)") \
846 \
847 product(bool, UseLWPSynchronization, true, \
848 "Use LWP-based instead of libthread-based synchronization " \
849 "(SPARC only)") \
850 \
851 product(ccstr, SyncKnobs, NULL, \
852 "(Unstable) Various monitor synchronization tunables") \
853 \
854 product(intx, EmitSync, 0, \
855 "(Unsafe,Unstable) " \
856 " Controls emission of inline sync fast-path code") \
857 \
858 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
859 \
860 product(intx, Atomics, 0, \
861 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
862 \
863 product(intx, FenceInstruction, 0, \
864 "(Unsafe,Unstable) Experimental") \
865 \
866 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
867 \
868 product(intx, SyncVerbose, 0, "(Unstable)" ) \
869 \
870 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
871 \
872 product(intx, hashCode, 0, \
873 "(Unstable) select hashCode generation algorithm" ) \
874 \
875 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
876 "(Unstable, Linux-specific)" \
877 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
878 \
879 product(bool, FilterSpuriousWakeups , true, \
880 "Prevent spurious or premature wakeups from object.wait" \
881 "(Solaris only)") \
882 \
883 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
884 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
885 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
886 \
887 develop(bool, UsePthreads, false, \
888 "Use pthread-based instead of libthread-based synchronization " \
889 "(SPARC only)") \
890 \
891 product(bool, AdjustConcurrency, false, \
892 "call thr_setconcurrency at thread create time to avoid " \
893 "LWP starvation on MP systems (For Solaris Only)") \
894 \
895 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
896 "Should the system attempt to update the compiler file when " \
897 "an error occurs?") \
898 \
899 product(bool, ReduceSignalUsage, false, \
900 "Reduce the use of OS signals in Java and/or the VM") \
901 \
902 notproduct(bool, ValidateMarkSweep, false, \
903 "Do extra validation during MarkSweep collection") \
904 \
905 notproduct(bool, RecordMarkSweepCompaction, false, \
906 "Enable GC-to-GC recording and querying of compaction during " \
907 "MarkSweep") \
908 \
909 develop_pd(bool, ShareVtableStubs, \
910 "Share vtable stubs (smaller code but worse branch prediction") \
911 \
912 develop(bool, LoadLineNumberTables, true, \
913 "Tells whether the class file parser loads line number tables") \
914 \
915 develop(bool, LoadLocalVariableTables, true, \
916 "Tells whether the class file parser loads local variable tables")\
917 \
918 develop(bool, LoadLocalVariableTypeTables, true, \
919 "Tells whether the class file parser loads local variable type tables")\
920 \
921 product(bool, AllowUserSignalHandlers, false, \
922 "Do not complain if the application installs signal handlers " \
923 "(Solaris & Linux only)") \
924 \
925 product(bool, UseSignalChaining, true, \
926 "Use signal-chaining to invoke signal handlers installed " \
927 "by the application (Solaris & Linux only)") \
928 \
929 product(bool, UseAltSigs, false, \
930 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
931 "internal signals. (Solaris only)") \
932 \
933 product(bool, UseSpinning, false, \
934 "Use spinning in monitor inflation and before entry") \
935 \
936 product(bool, PreSpinYield, false, \
937 "Yield before inner spinning loop") \
938 \
939 product(bool, PostSpinYield, true, \
940 "Yield after inner spinning loop") \
941 \
942 product(bool, AllowJNIEnvProxy, false, \
943 "Allow JNIEnv proxies for jdbx") \
944 \
945 product(bool, JNIDetachReleasesMonitors, true, \
946 "JNI DetachCurrentThread releases monitors owned by thread") \
947 \
948 product(bool, RestoreMXCSROnJNICalls, false, \
949 "Restore MXCSR when returning from JNI calls") \
950 \
951 product(bool, CheckJNICalls, false, \
952 "Verify all arguments to JNI calls") \
953 \
954 product(bool, UseFastJNIAccessors, true, \
955 "Use optimized versions of Get<Primitive>Field") \
956 \
957 product(bool, EagerXrunInit, false, \
958 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
959 " but not all -Xrun libraries may support the state of the VM at this time") \
960 \
961 product(bool, PreserveAllAnnotations, false, \
962 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
963 \
964 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
965 "Number of OutOfMemoryErrors preallocated with backtrace") \
966 \
967 product(bool, LazyBootClassLoader, true, \
968 "Enable/disable lazy opening of boot class path entries") \
969 \
970 diagnostic(bool, UseIncDec, true, \
971 "Use INC, DEC instructions on x86") \
972 \
973 product(bool, UseNewLongLShift, false, \
974 "Use optimized bitwise shift left") \
975 \
976 product(bool, UseStoreImmI16, true, \
977 "Use store immediate 16-bits value instruction on x86") \
978 \
979 product(bool, UseAddressNop, false, \
980 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
981 \
982 product(bool, UseXmmLoadAndClearUpper, true, \
983 "Load low part of XMM register and clear upper part") \
984 \
985 product(bool, UseXmmRegToRegMoveAll, false, \
986 "Copy all XMM register bits when moving value between registers") \
987 \
988 product(bool, UseXmmI2D, false, \
989 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
990 \
991 product(bool, UseXmmI2F, false, \
992 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
993 \
994 product(intx, FieldsAllocationStyle, 1, \
995 "0 - type based with oops first, 1 - with oops last") \
996 \
997 product(bool, CompactFields, true, \
998 "Allocate nonstatic fields in gaps between previous fields") \
999 \
1000 notproduct(bool, PrintCompactFieldsSavings, false, \
1001 "Print how many words were saved with CompactFields") \
1002 \
1003 product(bool, UseBiasedLocking, true, \
1004 "Enable biased locking in JVM") \
1005 \
1006 product(intx, BiasedLockingStartupDelay, 4000, \
1007 "Number of milliseconds to wait before enabling biased locking") \
1008 \
1009 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1010 "Print statistics of biased locking in JVM") \
1011 \
1012 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1013 "Threshold of number of revocations per type to try to " \
1014 "rebias all objects in the heap of that type") \
1015 \
1016 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1017 "Threshold of number of revocations per type to permanently " \
1018 "revoke biases of all objects in the heap of that type") \
1019 \
1020 product(intx, BiasedLockingDecayTime, 25000, \
1021 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1022 "type after previous bulk rebias") \
1023 \
1024 /* tracing */ \
1025 \
1026 notproduct(bool, TraceRuntimeCalls, false, \
1027 "Trace run-time calls") \
1028 \
1029 develop(bool, TraceJNICalls, false, \
1030 "Trace JNI calls") \
1031 \
1032 notproduct(bool, TraceJVMCalls, false, \
1033 "Trace JVM calls") \
1034 \
1035 product(ccstr, TraceJVMTI, NULL, \
1036 "Trace flags for JVMTI functions and events") \
1037 \
1038 /* This option can change an EMCP method into an obsolete method. */ \
1039 /* This can affect tests that except specific methods to be EMCP. */ \
1040 /* This option should be used with caution. */ \
1041 product(bool, StressLdcRewrite, false, \
1042 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1043 \
1044 product(intx, TraceRedefineClasses, 0, \
1045 "Trace level for JVMTI RedefineClasses") \
1046 \
1047 /* change to false by default sometime after Mustang */ \
1048 product(bool, VerifyMergedCPBytecodes, true, \
1049 "Verify bytecodes after RedefineClasses constant pool merging") \
1050 \
1051 develop(bool, TraceJNIHandleAllocation, false, \
1052 "Trace allocation/deallocation of JNI handle blocks") \
1053 \
1054 develop(bool, TraceThreadEvents, false, \
1055 "Trace all thread events") \
1056 \
1057 develop(bool, TraceBytecodes, false, \
1058 "Trace bytecode execution") \
1059 \
1060 develop(bool, TraceClassInitialization, false, \
1061 "Trace class initialization") \
1062 \
1063 develop(bool, TraceExceptions, false, \
1064 "Trace exceptions") \
1065 \
1066 develop(bool, TraceICs, false, \
1067 "Trace inline cache changes") \
1068 \
1069 notproduct(bool, TraceInvocationCounterOverflow, false, \
1070 "Trace method invocation counter overflow") \
1071 \
1072 develop(bool, TraceInlineCacheClearing, false, \
1073 "Trace clearing of inline caches in nmethods") \
1074 \
1075 develop(bool, TraceDependencies, false, \
1076 "Trace dependencies") \
1077 \
1078 develop(bool, VerifyDependencies, trueInDebug, \
1079 "Exercise and verify the compilation dependency mechanism") \
1080 \
1081 develop(bool, TraceNewOopMapGeneration, false, \
1082 "Trace OopMapGeneration") \
1083 \
1084 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1085 "Trace OopMapGeneration: print detailed cell states") \
1086 \
1087 develop(bool, TimeOopMap, false, \
1088 "Time calls to GenerateOopMap::compute_map() in sum") \
1089 \
1090 develop(bool, TimeOopMap2, false, \
1091 "Time calls to GenerateOopMap::compute_map() individually") \
1092 \
1093 develop(bool, TraceMonitorMismatch, false, \
1094 "Trace monitor matching failures during OopMapGeneration") \
1095 \
1096 develop(bool, TraceOopMapRewrites, false, \
1097 "Trace rewritting of method oops during oop map generation") \
1098 \
1099 develop(bool, TraceSafepoint, false, \
1100 "Trace safepoint operations") \
1101 \
1102 develop(bool, TraceICBuffer, false, \
1103 "Trace usage of IC buffer") \
1104 \
1105 develop(bool, TraceCompiledIC, false, \
1106 "Trace changes of compiled IC") \
1107 \
1108 notproduct(bool, TraceZapDeadLocals, false, \
1109 "Trace zapping dead locals") \
1110 \
1111 develop(bool, TraceStartupTime, false, \
1112 "Trace setup time") \
1113 \
1114 develop(bool, TraceHPI, false, \
1115 "Trace Host Porting Interface (HPI)") \
1116 \
1117 product(ccstr, HPILibPath, NULL, \
1118 "Specify alternate path to HPI library") \
1119 \
1120 develop(bool, TraceProtectionDomainVerification, false, \
1121 "Trace protection domain verifcation") \
1122 \
1123 develop(bool, TraceClearedExceptions, false, \
1124 "Prints when an exception is forcibly cleared") \
1125 \
1126 product(bool, TraceClassResolution, false, \
1127 "Trace all constant pool resolutions (for debugging)") \
1128 \
1129 product(bool, TraceBiasedLocking, false, \
1130 "Trace biased locking in JVM") \
1131 \
1132 product(bool, TraceMonitorInflation, false, \
1133 "Trace monitor inflation in JVM") \
1134 \
1135 /* assembler */ \
1136 product(bool, Use486InstrsOnly, false, \
1137 "Use 80486 Compliant instruction subset") \
1138 \
1139 /* gc */ \
1140 \
1141 product(bool, UseSerialGC, false, \
1142 "Use the serial garbage collector") \
1143 \
1144 experimental(bool, UseG1GC, false, \
1145 "Use the Garbage-First garbage collector") \
1146 \
1147 product(bool, UseParallelGC, false, \
1148 "Use the Parallel Scavenge garbage collector") \
1149 \
1150 product(bool, UseParallelOldGC, false, \
1151 "Use the Parallel Old garbage collector") \
1152 \
1153 product(bool, UseParallelOldGCCompacting, true, \
1154 "In the Parallel Old garbage collector use parallel compaction") \
1155 \
1156 product(bool, UseParallelDensePrefixUpdate, true, \
1157 "In the Parallel Old garbage collector use parallel dense" \
1158 " prefix update") \
1159 \
1160 product(uintx, HeapMaximumCompactionInterval, 20, \
1161 "How often should we maximally compact the heap (not allowing " \
1162 "any dead space)") \
1163 \
1164 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1165 "The collection count for the first maximum compaction") \
1166 \
1167 product(bool, UseMaximumCompactionOnSystemGC, true, \
1168 "In the Parallel Old garbage collector maximum compaction for " \
1169 "a system GC") \
1170 \
1171 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1172 "The mean used by the par compact dead wood" \
1173 "limiter (a number between 0-100).") \
1174 \
1175 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1176 "The standard deviation used by the par compact dead wood" \
1177 "limiter (a number between 0-100).") \
1178 \
1179 product(bool, UseParallelOldGCDensePrefix, true, \
1180 "Use a dense prefix with the Parallel Old garbage collector") \
1181 \
1182 product(uintx, ParallelGCThreads, 0, \
1183 "Number of parallel threads parallel gc will use") \
1184 \
1185 product(uintx, ParallelCMSThreads, 0, \
1186 "Max number of threads CMS will use for concurrent work") \
1187 \
1188 develop(bool, ParallelOldMTUnsafeMarkBitMap, false, \
1189 "Use the Parallel Old MT unsafe in marking the bitmap") \
1190 \
1191 develop(bool, ParallelOldMTUnsafeUpdateLiveData, false, \
1192 "Use the Parallel Old MT unsafe in update of live size") \
1193 \
1194 develop(bool, TraceRegionTasksQueuing, false, \
1195 "Trace the queuing of the region tasks") \
1196 \
1197 product(uintx, ParallelMarkingThreads, 0, \
1198 "Number of marking threads concurrent gc will use") \
1199 \
1200 product(uintx, YoungPLABSize, 4096, \
1201 "Size of young gen promotion labs (in HeapWords)") \
1202 \
1203 product(uintx, OldPLABSize, 1024, \
1204 "Size of old gen promotion labs (in HeapWords)") \
1205 \
1206 product(uintx, GCTaskTimeStampEntries, 200, \
1207 "Number of time stamp entries per gc worker thread") \
1208 \
1209 product(bool, AlwaysTenure, false, \
1210 "Always tenure objects in eden. (ParallelGC only)") \
1211 \
1212 product(bool, NeverTenure, false, \
1213 "Never tenure objects in eden, May tenure on overflow" \
1214 " (ParallelGC only)") \
1215 \
1216 product(bool, ScavengeBeforeFullGC, true, \
1217 "Scavenge youngest generation before each full GC," \
1218 " used with UseParallelGC") \
1219 \
1220 develop(bool, ScavengeWithObjectsInToSpace, false, \
1221 "Allow scavenges to occur when to_space contains objects.") \
1222 \
1223 product(bool, UseConcMarkSweepGC, false, \
1224 "Use Concurrent Mark-Sweep GC in the old generation") \
1225 \
1226 product(bool, ExplicitGCInvokesConcurrent, false, \
1227 "A System.gc() request invokes a concurrent collection;" \
1228 " (effective only when UseConcMarkSweepGC)") \
1229 \
1230 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1231 "A System.gc() request invokes a concurrent collection and" \
1232 " also unloads classes during such a concurrent gc cycle " \
1233 " (effective only when UseConcMarkSweepGC)") \
1234 \
1235 develop(bool, UseCMSAdaptiveFreeLists, true, \
1236 "Use Adaptive Free Lists in the CMS generation") \
1237 \
1238 develop(bool, UseAsyncConcMarkSweepGC, true, \
1239 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1240 \
1241 develop(bool, RotateCMSCollectionTypes, false, \
1242 "Rotate the CMS collections among concurrent and STW") \
1243 \
1244 product(bool, UseCMSBestFit, true, \
1245 "Use CMS best fit allocation strategy") \
1246 \
1247 product(bool, UseCMSCollectionPassing, true, \
1248 "Use passing of collection from background to foreground") \
1249 \
1250 product(bool, UseParNewGC, false, \
1251 "Use parallel threads in the new generation.") \
1252 \
1253 product(bool, ParallelGCVerbose, false, \
1254 "Verbose output for parallel GC.") \
1255 \
1256 product(intx, ParallelGCBufferWastePct, 10, \
1257 "wasted fraction of parallel allocation buffer.") \
1258 \
1259 product(bool, ParallelGCRetainPLAB, true, \
1260 "Retain parallel allocation buffers across scavenges.") \
1261 \
1262 product(intx, TargetPLABWastePct, 10, \
1263 "target wasted space in last buffer as pct of overall allocation")\
1264 \
1265 product(uintx, PLABWeight, 75, \
1266 "Percentage (0-100) used to weight the current sample when" \
1267 "computing exponentially decaying average for ResizePLAB.") \
1268 \
1269 product(bool, ResizePLAB, true, \
1270 "Dynamically resize (survivor space) promotion labs") \
1271 \
1272 product(bool, PrintPLAB, false, \
1273 "Print (survivor space) promotion labs sizing decisions") \
1274 \
1275 product(intx, ParGCArrayScanChunk, 50, \
1276 "Scan a subset and push remainder, if array is bigger than this") \
1277 \
1278 product(intx, ParGCDesiredObjsFromOverflowList, 20, \
1279 "The desired number of objects to claim from the overflow list") \
1280 \
1281 product(uintx, CMSParPromoteBlocksToClaim, 50, \
1282 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1283 "parallel GC.") \
1284 \
1285 product(bool, AlwaysPreTouch, false, \
1286 "It forces all freshly committed pages to be pre-touched.") \
1287 \
1288 product(bool, CMSUseOldDefaults, false, \
1289 "A flag temporarily introduced to allow reverting to some older" \
1290 "default settings; older as of 6.0 ") \
1291 \
1292 product(intx, CMSYoungGenPerWorker, 16*M, \
1293 "The amount of young gen chosen by default per GC worker " \
1294 "thread available ") \
1295 \
1296 product(bool, GCOverheadReporting, false, \
1297 "Enables the GC overhead reporting facility") \
1298 \
1299 product(intx, GCOverheadReportingPeriodMS, 100, \
1300 "Reporting period for conc GC overhead reporting, in ms ") \
1301 \
1302 product(bool, CMSIncrementalMode, false, \
1303 "Whether CMS GC should operate in \"incremental\" mode") \
1304 \
1305 product(uintx, CMSIncrementalDutyCycle, 10, \
1306 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1307 "CMSIncrementalPacing is enabled, then this is just the initial" \
1308 "value") \
1309 \
1310 product(bool, CMSIncrementalPacing, true, \
1311 "Whether the CMS incremental mode duty cycle should be " \
1312 "automatically adjusted") \
1313 \
1314 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1315 "Lower bound on the duty cycle when CMSIncrementalPacing is" \
1316 "enabled (a percentage, 0-100).") \
1317 \
1318 product(uintx, CMSIncrementalSafetyFactor, 10, \
1319 "Percentage (0-100) used to add conservatism when computing the" \
1320 "duty cycle.") \
1321 \
1322 product(uintx, CMSIncrementalOffset, 0, \
1323 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1324 "is shifted to the right within the period between young GCs") \
1325 \
1326 product(uintx, CMSExpAvgFactor, 25, \
1327 "Percentage (0-100) used to weight the current sample when" \
1328 "computing exponential averages for CMS statistics.") \
1329 \
1330 product(uintx, CMS_FLSWeight, 50, \
1331 "Percentage (0-100) used to weight the current sample when" \
1332 "computing exponentially decating averages for CMS FLS statistics.") \
1333 \
1334 product(uintx, CMS_FLSPadding, 2, \
1335 "The multiple of deviation from mean to use for buffering" \
1336 "against volatility in free list demand.") \
1337 \
1338 product(uintx, FLSCoalescePolicy, 2, \
1339 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1340 \
1341 product(uintx, CMS_SweepWeight, 50, \
1342 "Percentage (0-100) used to weight the current sample when" \
1343 "computing exponentially decaying average for inter-sweep duration.") \
1344 \
1345 product(uintx, CMS_SweepPadding, 2, \
1346 "The multiple of deviation from mean to use for buffering" \
1347 "against volatility in inter-sweep duration.") \
1348 \
1349 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1350 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1351 " duration exceeds this threhold in milliseconds") \
1352 \
1353 develop(bool, CMSTraceIncrementalMode, false, \
1354 "Trace CMS incremental mode") \
1355 \
1356 develop(bool, CMSTraceIncrementalPacing, false, \
1357 "Trace CMS incremental mode pacing computation") \
1358 \
1359 develop(bool, CMSTraceThreadState, false, \
1360 "Trace the CMS thread state (enable the trace_state() method)") \
1361 \
1362 product(bool, CMSClassUnloadingEnabled, false, \
1363 "Whether class unloading enabled when using CMS GC") \
1364 \
1365 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1366 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1367 " for which classes may not be unloaded") \
1368 \
1369 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1370 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1371 \
1372 product(bool, UseCMSCompactAtFullCollection, true, \
1373 "Use mark sweep compact at full collections") \
1374 \
1375 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1376 "Number of CMS full collection done before compaction if > 0") \
1377 \
1378 develop(intx, CMSDictionaryChoice, 0, \
1379 "Use BinaryTreeDictionary as default in the CMS generation") \
1380 \
1381 product(uintx, CMSIndexedFreeListReplenish, 4, \
1382 "Replenish and indexed free list with this number of chunks") \
1383 \
1384 product(bool, CMSLoopWarn, false, \
1385 "Warn in case of excessive CMS looping") \
1386 \
1387 develop(bool, CMSOverflowEarlyRestoration, false, \
1388 "Whether preserved marks should be restored early") \
1389 \
1390 product(uintx, CMSMarkStackSize, 32*K, \
1391 "Size of CMS marking stack") \
1392 \
1393 product(uintx, CMSMarkStackSizeMax, 4*M, \
1394 "Max size of CMS marking stack") \
1395 \
1396 notproduct(bool, CMSMarkStackOverflowALot, false, \
1397 "Whether we should simulate frequent marking stack / work queue" \
1398 " overflow") \
1399 \
1400 notproduct(intx, CMSMarkStackOverflowInterval, 1000, \
1401 "A per-thread `interval' counter that determines how frequently" \
1402 " we simulate overflow; a smaller number increases frequency") \
1403 \
1404 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1405 "(Temporary, subject to experimentation)" \
1406 "Maximum number of abortable preclean iterations, if > 0") \
1407 \
1408 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1409 "(Temporary, subject to experimentation)" \
1410 "Maximum time in abortable preclean in ms") \
1411 \
1412 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1413 "(Temporary, subject to experimentation)" \
1414 "Nominal minimum work per abortable preclean iteration") \
1415 \
1416 product(intx, CMSAbortablePrecleanWaitMillis, 100, \
1417 "(Temporary, subject to experimentation)" \
1418 " Time that we sleep between iterations when not given" \
1419 " enough work per iteration") \
1420 \
1421 product(uintx, CMSRescanMultiple, 32, \
1422 "Size (in cards) of CMS parallel rescan task") \
1423 \
1424 product(uintx, CMSConcMarkMultiple, 32, \
1425 "Size (in cards) of CMS concurrent MT marking task") \
1426 \
1427 product(uintx, CMSRevisitStackSize, 1*M, \
1428 "Size of CMS KlassKlass revisit stack") \
1429 \
1430 product(bool, CMSAbortSemantics, false, \
1431 "Whether abort-on-overflow semantics is implemented") \
1432 \
1433 product(bool, CMSParallelRemarkEnabled, true, \
1434 "Whether parallel remark enabled (only if ParNewGC)") \
1435 \
1436 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1437 "Whether parallel remark of survivor space" \
1438 " enabled (effective only if CMSParallelRemarkEnabled)") \
1439 \
1440 product(bool, CMSPLABRecordAlways, true, \
1441 "Whether to always record survivor space PLAB bdries" \
1442 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1443 \
1444 product(bool, CMSConcurrentMTEnabled, true, \
1445 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1446 \
1447 product(bool, CMSPermGenPrecleaningEnabled, true, \
1448 "Whether concurrent precleaning enabled in perm gen" \
1449 " (effective only when CMSPrecleaningEnabled is true)") \
1450 \
1451 product(bool, CMSPrecleaningEnabled, true, \
1452 "Whether concurrent precleaning enabled") \
1453 \
1454 product(uintx, CMSPrecleanIter, 3, \
1455 "Maximum number of precleaning iteration passes") \
1456 \
1457 product(uintx, CMSPrecleanNumerator, 2, \
1458 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1459 " ratio") \
1460 \
1461 product(uintx, CMSPrecleanDenominator, 3, \
1462 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1463 " ratio") \
1464 \
1465 product(bool, CMSPrecleanRefLists1, false, \
1466 "Preclean ref lists during (initial) preclean phase") \
1467 \
1468 product(bool, CMSPrecleanRefLists2, false, \
1469 "Preclean ref lists during abortable preclean phase") \
1470 \
1471 product(bool, CMSPrecleanSurvivors1, false, \
1472 "Preclean survivors during (initial) preclean phase") \
1473 \
1474 product(bool, CMSPrecleanSurvivors2, true, \
1475 "Preclean survivors during abortable preclean phase") \
1476 \
1477 product(uintx, CMSPrecleanThreshold, 1000, \
1478 "Don't re-iterate if #dirty cards less than this") \
1479 \
1480 product(bool, CMSCleanOnEnter, true, \
1481 "Clean-on-enter optimization for reducing number of dirty cards") \
1482 \
1483 product(uintx, CMSRemarkVerifyVariant, 1, \
1484 "Choose variant (1,2) of verification following remark") \
1485 \
1486 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1487 "If Eden used is below this value, don't try to schedule remark") \
1488 \
1489 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1490 "The Eden occupancy % at which to try and schedule remark pause") \
1491 \
1492 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1493 "Start sampling Eden top at least before yg occupancy reaches" \
1494 " 1/<ratio> of the size at which we plan to schedule remark") \
1495 \
1496 product(uintx, CMSSamplingGrain, 16*K, \
1497 "The minimum distance between eden samples for CMS (see above)") \
1498 \
1499 product(bool, CMSScavengeBeforeRemark, false, \
1500 "Attempt scavenge before the CMS remark step") \
1501 \
1502 develop(bool, CMSTraceSweeper, false, \
1503 "Trace some actions of the CMS sweeper") \
1504 \
1505 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1506 "Don't drain below this size per parallel worker/thief") \
1507 \
1508 product(intx, CMSWaitDuration, 2000, \
1509 "Time in milliseconds that CMS thread waits for young GC") \
1510 \
1511 product(bool, CMSYield, true, \
1512 "Yield between steps of concurrent mark & sweep") \
1513 \
1514 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1515 "Bitmap operations should process at most this many bits" \
1516 "between yields") \
1517 \
1518 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1519 "Verify that all refs across the FLS boundary " \
1520 " are to valid objects") \
1521 \
1522 diagnostic(bool, FLSVerifyLists, false, \
1523 "Do lots of (expensive) FreeListSpace verification") \
1524 \
1525 diagnostic(bool, FLSVerifyIndexTable, false, \
1526 "Do lots of (expensive) FLS index table verification") \
1527 \
1528 develop(bool, FLSVerifyDictionary, false, \
1529 "Do lots of (expensive) FLS dictionary verification") \
1530 \
1531 develop(bool, VerifyBlockOffsetArray, false, \
1532 "Do (expensive!) block offset array verification") \
1533 \
1534 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \
1535 "Maintain _unallocated_block in BlockOffsetArray" \
1536 " (currently applicable only to CMS collector)") \
1537 \
1538 develop(bool, TraceCMSState, false, \
1539 "Trace the state of the CMS collection") \
1540 \
1541 product(intx, RefDiscoveryPolicy, 0, \
1542 "Whether reference-based(0) or referent-based(1)") \
1543 \
1544 product(bool, ParallelRefProcEnabled, false, \
1545 "Enable parallel reference processing whenever possible") \
1546 \
1547 product(bool, ParallelRefProcBalancingEnabled, true, \
1548 "Enable balancing of reference processing queues") \
1549 \
1550 product(intx, CMSTriggerRatio, 80, \
1551 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1552 " allocated before a CMS collection cycle commences") \
1553 \
1554 product(intx, CMSTriggerPermRatio, 80, \
1555 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \
1556 " is allocated before a CMS collection cycle commences, that " \
1557 " also collects the perm generation") \
1558 \
1559 product(uintx, CMSBootstrapOccupancy, 50, \
1560 "Percentage CMS generation occupancy at which to " \
1561 " initiate CMS collection for bootstrapping collection stats") \
1562 \
1563 product(intx, CMSInitiatingOccupancyFraction, -1, \
1564 "Percentage CMS generation occupancy to start a CMS collection " \
1565 " cycle (A negative value means that CMSTriggerRatio is used)") \
1566 \
1567 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1568 "Percentage CMS perm generation occupancy to start a CMScollection"\
1569 " cycle (A negative value means that CMSTriggerPermRatio is used)")\
1570 \
1571 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1572 "Only use occupancy as a crierion for starting a CMS collection") \
1573 \
1574 product(intx, CMSIsTooFullPercentage, 98, \
1575 "An absolute ceiling above which CMS will always consider the" \
1576 " perm gen ripe for collection") \
1577 \
1578 develop(bool, CMSTestInFreeList, false, \
1579 "Check if the coalesced range is already in the " \
1580 "free lists as claimed.") \
1581 \
1582 notproduct(bool, CMSVerifyReturnedBytes, false, \
1583 "Check that all the garbage collected was returned to the " \
1584 "free lists.") \
1585 \
1586 notproduct(bool, ScavengeALot, false, \
1587 "Force scavenge at every Nth exit from the runtime system " \
1588 "(N=ScavengeALotInterval)") \
1589 \
1590 develop(bool, FullGCALot, false, \
1591 "Force full gc at every Nth exit from the runtime system " \
1592 "(N=FullGCALotInterval)") \
1593 \
1594 notproduct(bool, GCALotAtAllSafepoints, false, \
1595 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1596 \
1597 product(bool, HandlePromotionFailure, true, \
1598 "The youngest generation collection does not require" \
1599 " a guarantee of full promotion of all live objects.") \
1600 \
1601 notproduct(bool, PromotionFailureALot, false, \
1602 "Use promotion failure handling on every youngest generation " \
1603 "collection") \
1604 \
1605 develop(uintx, PromotionFailureALotCount, 1000, \
1606 "Number of promotion failures occurring at ParGCAllocBuffer" \
1607 "refill attempts (ParNew) or promotion attempts " \
1608 "(other young collectors) ") \
1609 \
1610 develop(uintx, PromotionFailureALotInterval, 5, \
1611 "Total collections between promotion failures alot") \
1612 \
1613 develop(intx, WorkStealingSleepMillis, 1, \
1614 "Sleep time when sleep is used for yields") \
1615 \
1616 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1617 "Number of yields before a sleep is done during workstealing") \
1618 \
1619 product(uintx, PreserveMarkStackSize, 40, \
1620 "Size for stack used in promotion failure handling") \
1621 \
1622 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1623 \
1624 product_pd(bool, ResizeTLAB, \
1625 "Dynamically resize tlab size for threads") \
1626 \
1627 product(bool, ZeroTLAB, false, \
1628 "Zero out the newly created TLAB") \
1629 \
1630 product(bool, FastTLABRefill, true, \
1631 "Use fast TLAB refill code") \
1632 \
1633 product(bool, PrintTLAB, false, \
1634 "Print various TLAB related information") \
1635 \
1636 product(bool, TLABStats, true, \
1637 "Print various TLAB related information") \
1638 \
1639 product_pd(bool, NeverActAsServerClassMachine, \
1640 "Never act like a server-class machine") \
1641 \
1642 product(bool, AlwaysActAsServerClassMachine, false, \
1643 "Always act like a server-class machine") \
1644 \
1645 product_pd(uintx, DefaultMaxRAM, \
1646 "Maximum real memory size for setting server class heap size") \
1647 \
1648 product(uintx, DefaultMaxRAMFraction, 4, \
1649 "Fraction (1/n) of real memory used for server class max heap") \
1650 \
1651 product(uintx, DefaultInitialRAMFraction, 64, \
1652 "Fraction (1/n) of real memory used for server class initial heap") \
1653 \
1654 product(bool, UseAutoGCSelectPolicy, false, \
1655 "Use automatic collection selection policy") \
1656 \
1657 product(uintx, AutoGCSelectPauseMillis, 5000, \
1658 "Automatic GC selection pause threshhold in ms") \
1659 \
1660 product(bool, UseAdaptiveSizePolicy, true, \
1661 "Use adaptive generation sizing policies") \
1662 \
1663 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1664 "Use adaptive survivor sizing policies") \
1665 \
1666 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1667 "Use adaptive young-old sizing policies at minor collections") \
1668 \
1669 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1670 "Use adaptive young-old sizing policies at major collections") \
1671 \
1672 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1673 "Use statistics from System.GC for adaptive size policy") \
1674 \
1675 product(bool, UseAdaptiveGCBoundary, false, \
1676 "Allow young-old boundary to move") \
1677 \
1678 develop(bool, TraceAdaptiveGCBoundary, false, \
1679 "Trace young-old boundary moves") \
1680 \
1681 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
1682 "Resize the virtual spaces of the young or old generations") \
1683 \
1684 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
1685 "Policy for changeing generation size for throughput goals") \
1686 \
1687 product(uintx, AdaptiveSizePausePolicy, 0, \
1688 "Policy for changing generation size for pause goals") \
1689 \
1690 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
1691 "Adjust tenured generation to achive a minor pause goal") \
1692 \
1693 develop(bool, PSAdjustYoungGenForMajorPause, false, \
1694 "Adjust young generation to achive a major pause goal") \
1695 \
1696 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
1697 "Number of steps where heuristics is used before data is used") \
1698 \
1699 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
1700 "Number of collections before the adaptive sizing is started") \
1701 \
1702 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
1703 "Collecton interval for printing information, zero => never") \
1704 \
1705 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
1706 "Use adaptive minimum footprint as a goal") \
1707 \
1708 product(uintx, AdaptiveSizePolicyWeight, 10, \
1709 "Weight given to exponential resizing, between 0 and 100") \
1710 \
1711 product(uintx, AdaptiveTimeWeight, 25, \
1712 "Weight given to time in adaptive policy, between 0 and 100") \
1713 \
1714 product(uintx, PausePadding, 1, \
1715 "How much buffer to keep for pause time") \
1716 \
1717 product(uintx, PromotedPadding, 3, \
1718 "How much buffer to keep for promotion failure") \
1719 \
1720 product(uintx, SurvivorPadding, 3, \
1721 "How much buffer to keep for survivor overflow") \
1722 \
1723 product(uintx, AdaptivePermSizeWeight, 20, \
1724 "Weight for perm gen exponential resizing, between 0 and 100") \
1725 \
1726 product(uintx, PermGenPadding, 3, \
1727 "How much buffer to keep for perm gen sizing") \
1728 \
1729 product(uintx, ThresholdTolerance, 10, \
1730 "Allowed collection cost difference between generations") \
1731 \
1732 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
1733 "If collection costs are within margin, reduce both by full delta") \
1734 \
1735 product(uintx, YoungGenerationSizeIncrement, 20, \
1736 "Adaptive size percentage change in young generation") \
1737 \
1738 product(uintx, YoungGenerationSizeSupplement, 80, \
1739 "Supplement to YoungedGenerationSizeIncrement used at startup") \
1740 \
1741 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
1742 "Decay factor to YoungedGenerationSizeSupplement") \
1743 \
1744 product(uintx, TenuredGenerationSizeIncrement, 20, \
1745 "Adaptive size percentage change in tenured generation") \
1746 \
1747 product(uintx, TenuredGenerationSizeSupplement, 80, \
1748 "Supplement to TenuredGenerationSizeIncrement used at startup") \
1749 \
1750 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
1751 "Decay factor to TenuredGenerationSizeIncrement") \
1752 \
1753 product(uintx, MaxGCPauseMillis, max_uintx, \
1754 "Adaptive size policy maximum GC pause time goal in msec") \
1755 \
1756 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
1757 "Adaptive size policy maximum GC minor pause time goal in msec") \
1758 \
1759 product(uintx, GCTimeRatio, 99, \
1760 "Adaptive size policy application time to GC time ratio") \
1761 \
1762 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
1763 "Adaptive size scale down factor for shrinking") \
1764 \
1765 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
1766 "Adaptive size decays the major cost for long major intervals") \
1767 \
1768 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
1769 "Time scale over which major costs decay") \
1770 \
1771 product(uintx, MinSurvivorRatio, 3, \
1772 "Minimum ratio of young generation/survivor space size") \
1773 \
1774 product(uintx, InitialSurvivorRatio, 8, \
1775 "Initial ratio of eden/survivor space size") \
1776 \
1777 product(uintx, BaseFootPrintEstimate, 256*M, \
1778 "Estimate of footprint other than Java Heap") \
1779 \
1780 product(bool, UseGCOverheadLimit, true, \
1781 "Use policy to limit of proportion of time spent in GC " \
1782 "before an OutOfMemory error is thrown") \
1783 \
1784 product(uintx, GCTimeLimit, 98, \
1785 "Limit of proportion of time spent in GC before an OutOfMemory" \
1786 "error is thrown (used with GCHeapFreeLimit)") \
1787 \
1788 product(uintx, GCHeapFreeLimit, 2, \
1789 "Minimum percentage of free space after a full GC before an " \
1790 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
1791 \
1792 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
1793 "Number of consecutive collections before gc time limit fires") \
1794 \
1795 product(bool, PrintAdaptiveSizePolicy, false, \
1796 "Print information about AdaptiveSizePolicy") \
1797 \
1798 product(intx, PrefetchCopyIntervalInBytes, -1, \
1799 "How far ahead to prefetch destination area (<= 0 means off)") \
1800 \
1801 product(intx, PrefetchScanIntervalInBytes, -1, \
1802 "How far ahead to prefetch scan area (<= 0 means off)") \
1803 \
1804 product(intx, PrefetchFieldsAhead, -1, \
1805 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
1806 \
1807 develop(bool, UsePrefetchQueue, true, \
1808 "Use the prefetch queue during PS promotion") \
1809 \
1810 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
1811 "Verify system before exiting") \
1812 \
1813 diagnostic(bool, VerifyBeforeGC, false, \
1814 "Verify memory system before GC") \
1815 \
1816 diagnostic(bool, VerifyAfterGC, false, \
1817 "Verify memory system after GC") \
1818 \
1819 diagnostic(bool, VerifyDuringGC, false, \
1820 "Verify memory system during GC (between phases)") \
1821 \
1822 diagnostic(bool, VerifyRememberedSets, false, \
1823 "Verify GC remembered sets") \
1824 \
1825 diagnostic(bool, VerifyObjectStartArray, true, \
1826 "Verify GC object start array if verify before/after") \
1827 \
1828 product(bool, DisableExplicitGC, false, \
1829 "Tells whether calling System.gc() does a full GC") \
1830 \
1831 notproduct(bool, CheckMemoryInitialization, false, \
1832 "Checks memory initialization") \
1833 \
1834 product(bool, CollectGen0First, false, \
1835 "Collect youngest generation before each full GC") \
1836 \
1837 diagnostic(bool, BindCMSThreadToCPU, false, \
1838 "Bind CMS Thread to CPU if possible") \
1839 \
1840 diagnostic(uintx, CPUForCMSThread, 0, \
1841 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
1842 \
1843 product(bool, BindGCTaskThreadsToCPUs, false, \
1844 "Bind GCTaskThreads to CPUs if possible") \
1845 \
1846 product(bool, UseGCTaskAffinity, false, \
1847 "Use worker affinity when asking for GCTasks") \
1848 \
1849 product(uintx, ProcessDistributionStride, 4, \
1850 "Stride through processors when distributing processes") \
1851 \
1852 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
1853 "number of times the coordinator GC thread will sleep while " \
1854 "yielding before giving up and resuming GC") \
1855 \
1856 product(uintx, CMSYieldSleepCount, 0, \
1857 "number of times a GC thread (minus the coordinator) " \
1858 "will sleep while yielding before giving up and resuming GC") \
1859 \
1860 notproduct(bool, PrintFlagsFinal, false, \
1861 "Print all command line flags after argument processing") \
1862 \
1863 /* gc tracing */ \
1864 manageable(bool, PrintGC, false, \
1865 "Print message at garbage collect") \
1866 \
1867 manageable(bool, PrintGCDetails, false, \
1868 "Print more details at garbage collect") \
1869 \
1870 manageable(bool, PrintGCDateStamps, false, \
1871 "Print date stamps at garbage collect") \
1872 \
1873 manageable(bool, PrintGCTimeStamps, false, \
1874 "Print timestamps at garbage collect") \
1875 \
1876 product(bool, PrintGCTaskTimeStamps, false, \
1877 "Print timestamps for individual gc worker thread tasks") \
1878 \
1879 develop(intx, ConcGCYieldTimeout, 0, \
1880 "If non-zero, assert that GC threads yield within this # of ms.") \
1881 \
1882 notproduct(bool, TraceMarkSweep, false, \
1883 "Trace mark sweep") \
1884 \
1885 product(bool, PrintReferenceGC, false, \
1886 "Print times spent handling reference objects during GC " \
1887 " (enabled only when PrintGCDetails)") \
1888 \
1889 develop(bool, TraceReferenceGC, false, \
1890 "Trace handling of soft/weak/final/phantom references") \
1891 \
1892 develop(bool, TraceFinalizerRegistration, false, \
1893 "Trace registration of final references") \
1894 \
1895 notproduct(bool, TraceScavenge, false, \
1896 "Trace scavenge") \
1897 \
1898 product_rw(bool, TraceClassLoading, false, \
1899 "Trace all classes loaded") \
1900 \
1901 product(bool, TraceClassLoadingPreorder, false, \
1902 "Trace all classes loaded in order referenced (not loaded)") \
1903 \
1904 product_rw(bool, TraceClassUnloading, false, \
1905 "Trace unloading of classes") \
1906 \
1907 product_rw(bool, TraceLoaderConstraints, false, \
1908 "Trace loader constraints") \
1909 \
1910 product(bool, TraceGen0Time, false, \
1911 "Trace accumulated time for Gen 0 collection") \
1912 \
1913 product(bool, TraceGen1Time, false, \
1914 "Trace accumulated time for Gen 1 collection") \
1915 \
1916 product(bool, PrintTenuringDistribution, false, \
1917 "Print tenuring age information") \
1918 \
1919 product_rw(bool, PrintHeapAtGC, false, \
1920 "Print heap layout before and after each GC") \
1921 \
1922 product(bool, PrintHeapAtSIGBREAK, true, \
1923 "Print heap layout in response to SIGBREAK") \
1924 \
1925 manageable(bool, PrintClassHistogram, false, \
1926 "Print a histogram of class instances") \
1927 \
1928 develop(bool, TraceWorkGang, false, \
1929 "Trace activities of work gangs") \
1930 \
1931 product(bool, TraceParallelOldGCTasks, false, \
1932 "Trace multithreaded GC activity") \
1933 \
1934 develop(bool, TraceBlockOffsetTable, false, \
1935 "Print BlockOffsetTable maps") \
1936 \
1937 develop(bool, TraceCardTableModRefBS, false, \
1938 "Print CardTableModRefBS maps") \
1939 \
1940 develop(bool, TraceGCTaskManager, false, \
1941 "Trace actions of the GC task manager") \
1942 \
1943 develop(bool, TraceGCTaskQueue, false, \
1944 "Trace actions of the GC task queues") \
1945 \
1946 develop(bool, TraceGCTaskThread, false, \
1947 "Trace actions of the GC task threads") \
1948 \
1949 product(bool, PrintParallelOldGCPhaseTimes, false, \
1950 "Print the time taken by each parallel old gc phase." \
1951 "PrintGCDetails must also be enabled.") \
1952 \
1953 develop(bool, TraceParallelOldGCMarkingPhase, false, \
1954 "Trace parallel old gc marking phase") \
1955 \
1956 develop(bool, TraceParallelOldGCSummaryPhase, false, \
1957 "Trace parallel old gc summary phase") \
1958 \
1959 develop(bool, TraceParallelOldGCCompactionPhase, false, \
1960 "Trace parallel old gc compaction phase") \
1961 \
1962 develop(bool, TraceParallelOldGCDensePrefix, false, \
1963 "Trace parallel old gc dense prefix computation") \
1964 \
1965 develop(bool, IgnoreLibthreadGPFault, false, \
1966 "Suppress workaround for libthread GP fault") \
1967 \
1968 product(bool, PrintJNIGCStalls, false, \
1969 "Print diagnostic message when GC is stalled" \
1970 "by JNI critical section") \
1971 \
1972 /* JVMTI heap profiling */ \
1973 \
1974 diagnostic(bool, TraceJVMTIObjectTagging, false, \
1975 "Trace JVMTI object tagging calls") \
1976 \
1977 diagnostic(bool, VerifyBeforeIteration, false, \
1978 "Verify memory system before JVMTI iteration") \
1979 \
1980 /* compiler interface */ \
1981 \
1982 develop(bool, CIPrintCompilerName, false, \
1983 "when CIPrint is active, print the name of the active compiler") \
1984 \
1985 develop(bool, CIPrintCompileQueue, false, \
1986 "display the contents of the compile queue whenever a " \
1987 "compilation is enqueued") \
1988 \
1989 develop(bool, CIPrintRequests, false, \
1990 "display every request for compilation") \
1991 \
1992 product(bool, CITime, false, \
1993 "collect timing information for compilation") \
1994 \
1995 develop(bool, CITimeEach, false, \
1996 "display timing information after each successful compilation") \
1997 \
1998 develop(bool, CICountOSR, true, \
1999 "use a separate counter when assigning ids to osr compilations") \
2000 \
2001 develop(bool, CICompileNatives, true, \
2002 "compile native methods if supported by the compiler") \
2003 \
2004 develop_pd(bool, CICompileOSR, \
2005 "compile on stack replacement methods if supported by the " \
2006 "compiler") \
2007 \
2008 develop(bool, CIPrintMethodCodes, false, \
2009 "print method bytecodes of the compiled code") \
2010 \
2011 develop(bool, CIPrintTypeFlow, false, \
2012 "print the results of ciTypeFlow analysis") \
2013 \
2014 develop(bool, CITraceTypeFlow, false, \
2015 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2016 \
2017 develop(intx, CICloneLoopTestLimit, 100, \
2018 "size limit for blocks heuristically cloned in ciTypeFlow") \
2019 \
2020 /* temp diagnostics */ \
2021 \
2022 diagnostic(bool, TraceRedundantCompiles, false, \
2023 "Have compile broker print when a request already in the queue is"\
2024 " requested again") \
2025 \
2026 diagnostic(bool, InitialCompileFast, false, \
2027 "Initial compile at CompLevel_fast_compile") \
2028 \
2029 diagnostic(bool, InitialCompileReallyFast, false, \
2030 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2031 \
2032 diagnostic(bool, FullProfileOnReInterpret, true, \
2033 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2034 \
2035 /* compiler */ \
2036 \
2037 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2038 "Number of compiler threads to run") \
2039 \
2040 product(intx, CompilationPolicyChoice, 0, \
2041 "which compilation policy (0/1)") \
2042 \
2043 develop(bool, UseStackBanging, true, \
2044 "use stack banging for stack overflow checks (required for " \
2045 "proper StackOverflow handling; disable only to measure cost " \
2046 "of stackbanging)") \
2047 \
2048 develop(bool, Use24BitFPMode, true, \
2049 "Set 24-bit FPU mode on a per-compile basis ") \
2050 \
2051 develop(bool, Use24BitFP, true, \
2052 "use FP instructions that produce 24-bit precise results") \
2053 \
2054 develop(bool, UseStrictFP, true, \
2055 "use strict fp if modifier strictfp is set") \
2056 \
2057 develop(bool, GenerateSynchronizationCode, true, \
2058 "generate locking/unlocking code for synchronized methods and " \
2059 "monitors") \
2060 \
2061 develop(bool, GenerateCompilerNullChecks, true, \
2062 "Generate explicit null checks for loads/stores/calls") \
2063 \
2064 develop(bool, GenerateRangeChecks, true, \
2065 "Generate range checks for array accesses") \
2066 \
2067 develop_pd(bool, ImplicitNullChecks, \
2068 "generate code for implicit null checks") \
2069 \
2070 product(bool, PrintSafepointStatistics, false, \
2071 "print statistics about safepoint synchronization") \
2072 \
2073 product(intx, PrintSafepointStatisticsCount, 300, \
2074 "total number of safepoint statistics collected " \
2075 "before printing them out") \
2076 \
2077 product(intx, PrintSafepointStatisticsTimeout, -1, \
2078 "print safepoint statistics only when safepoint takes" \
2079 " more than PrintSafepointSatisticsTimeout in millis") \
2080 \
2081 develop(bool, InlineAccessors, true, \
2082 "inline accessor methods (get/set)") \
2083 \
2084 product(bool, Inline, true, \
2085 "enable inlining") \
2086 \
2087 product(bool, ClipInlining, true, \
2088 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2089 \
2090 develop(bool, UseCHA, true, \
2091 "enable CHA") \
2092 \
2093 product(bool, UseTypeProfile, true, \
2094 "Check interpreter profile for historically monomorphic calls") \
2095 \
2096 product(intx, TypeProfileMajorReceiverPercent, 90, \
2097 "% of major receiver type to all profiled receivers") \
2098 \
2099 notproduct(bool, TimeCompiler, false, \
2100 "time the compiler") \
2101 \
2102 notproduct(bool, TimeCompiler2, false, \
2103 "detailed time the compiler (requires +TimeCompiler)") \
2104 \
2105 diagnostic(bool, PrintInlining, false, \
2106 "prints inlining optimizations") \
2107 \
2108 diagnostic(bool, PrintIntrinsics, false, \
2109 "prints attempted and successful inlining of intrinsics") \
2110 \
2111 diagnostic(ccstrlist, DisableIntrinsic, "", \
2112 "do not expand intrinsics whose (internal) names appear here") \
2113 \
2114 develop(bool, StressReflectiveCode, false, \
2115 "Use inexact types at allocations, etc., to test reflection") \
2116 \
2117 develop(bool, EagerInitialization, false, \
2118 "Eagerly initialize classes if possible") \
2119 \
2120 product(bool, Tier1UpdateMethodData, trueInTiered, \
2121 "Update methodDataOops in Tier1-generated code") \
2122 \
2123 develop(bool, TraceMethodReplacement, false, \
2124 "Print when methods are replaced do to recompilation") \
2125 \
2126 develop(bool, PrintMethodFlushing, false, \
2127 "print the nmethods being flushed") \
2128 \
2129 notproduct(bool, LogMultipleMutexLocking, false, \
2130 "log locking and unlocking of mutexes (only if multiple locks " \
2131 "are held)") \
2132 \
2133 develop(bool, UseRelocIndex, false, \
2134 "use an index to speed random access to relocations") \
2135 \
2136 develop(bool, StressCodeBuffers, false, \
2137 "Exercise code buffer expansion and other rare state changes") \
2138 \
2139 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2140 "Generate extra debugging info for non-safepoints in nmethods") \
2141 \
2142 diagnostic(bool, DebugInlinedCalls, true, \
2143 "If false, restricts profiled locations to the root method only") \
2144 \
2145 product(bool, PrintVMOptions, trueInDebug, \
2146 "print VM flag settings") \
2147 \
2148 diagnostic(bool, SerializeVMOutput, true, \
2149 "Use a mutex to serialize output to tty and hotspot.log") \
2150 \
2151 diagnostic(bool, DisplayVMOutput, true, \
2152 "Display all VM output on the tty, independently of LogVMOutput") \
2153 \
2154 diagnostic(bool, LogVMOutput, trueInDebug, \
2155 "Save VM output to hotspot.log, or to LogFile") \
2156 \
2157 diagnostic(ccstr, LogFile, NULL, \
2158 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2159 \
2160 product(ccstr, ErrorFile, NULL, \
2161 "If an error occurs, save the error data to this file " \
2162 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2163 \
2164 product(bool, DisplayVMOutputToStderr, false, \
2165 "If DisplayVMOutput is true, display all VM output to stderr") \
2166 \
2167 product(bool, DisplayVMOutputToStdout, false, \
2168 "If DisplayVMOutput is true, display all VM output to stdout") \
2169 \
2170 product(bool, UseHeavyMonitors, false, \
2171 "use heavyweight instead of lightweight Java monitors") \
2172 \
2173 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2174 "print histogram of the symbol table") \
2175 \
2176 notproduct(bool, ExitVMOnVerifyError, false, \
2177 "standard exit from VM if bytecode verify error " \
2178 "(only in debug mode)") \
2179 \
2180 notproduct(ccstr, AbortVMOnException, NULL, \
2181 "Call fatal if this exception is thrown. Example: " \
2182 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2183 \
2184 develop(bool, DebugVtables, false, \
2185 "add debugging code to vtable dispatch") \
2186 \
2187 develop(bool, PrintVtables, false, \
2188 "print vtables when printing klass") \
2189 \
2190 notproduct(bool, PrintVtableStats, false, \
2191 "print vtables stats at end of run") \
2192 \
2193 develop(bool, TraceCreateZombies, false, \
2194 "trace creation of zombie nmethods") \
2195 \
2196 notproduct(bool, IgnoreLockingAssertions, false, \
2197 "disable locking assertions (for speed)") \
2198 \
2199 notproduct(bool, VerifyLoopOptimizations, false, \
2200 "verify major loop optimizations") \
2201 \
2202 product(bool, RangeCheckElimination, true, \
2203 "Split loop iterations to eliminate range checks") \
2204 \
2205 develop_pd(bool, UncommonNullCast, \
2206 "track occurrences of null in casts; adjust compiler tactics") \
2207 \
2208 develop(bool, TypeProfileCasts, true, \
2209 "treat casts like calls for purposes of type profiling") \
2210 \
2211 develop(bool, MonomorphicArrayCheck, true, \
2212 "Uncommon-trap array store checks that require full type check") \
2213 \
2214 develop(bool, DelayCompilationDuringStartup, true, \
2215 "Delay invoking the compiler until main application class is " \
2216 "loaded") \
2217 \
2218 develop(bool, CompileTheWorld, false, \
2219 "Compile all methods in all classes in bootstrap class path " \
2220 "(stress test)") \
2221 \
2222 develop(bool, CompileTheWorldPreloadClasses, true, \
2223 "Preload all classes used by a class before start loading") \
2224 \
2225 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2226 "Compile all methods although class initializer failed") \
2227 \
2228 develop(bool, TraceIterativeGVN, false, \
2229 "Print progress during Iterative Global Value Numbering") \
2230 \
2231 develop(bool, FillDelaySlots, true, \
2232 "Fill delay slots (on SPARC only)") \
2233 \
2234 develop(bool, VerifyIterativeGVN, false, \
2235 "Verify Def-Use modifications during sparse Iterative Global " \
2236 "Value Numbering") \
2237 \
2238 notproduct(bool, TracePhaseCCP, false, \
2239 "Print progress during Conditional Constant Propagation") \
2240 \
2241 develop(bool, TimeLivenessAnalysis, false, \
2242 "Time computation of bytecode liveness analysis") \
2243 \
2244 develop(bool, TraceLivenessGen, false, \
2245 "Trace the generation of liveness analysis information") \
2246 \
2247 notproduct(bool, TraceLivenessQuery, false, \
2248 "Trace queries of liveness analysis information") \
2249 \
2250 notproduct(bool, CollectIndexSetStatistics, false, \
2251 "Collect information about IndexSets") \
2252 \
2253 develop(bool, PrintDominators, false, \
2254 "Print out dominator trees for GVN") \
2255 \
2256 develop(bool, UseLoopSafepoints, true, \
2257 "Generate Safepoint nodes in every loop") \
2258 \
2259 notproduct(bool, TraceCISCSpill, false, \
2260 "Trace allocators use of cisc spillable instructions") \
2261 \
2262 notproduct(bool, TraceSpilling, false, \
2263 "Trace spilling") \
2264 \
2265 develop(bool, DeutschShiffmanExceptions, true, \
2266 "Fast check to find exception handler for precisely typed " \
2267 "exceptions") \
2268 \
2269 product(bool, SplitIfBlocks, true, \
2270 "Clone compares and control flow through merge points to fold " \
2271 "some branches") \
2272 \
2273 develop(intx, FastAllocateSizeLimit, 128*K, \
2274 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2275 "Inline allocations larger than this in doublewords must go slow")\
2276 \
2277 product(bool, AggressiveOpts, false, \
2278 "Enable aggressive optimizations - see arguments.cpp") \
2279 \
2280 product(bool, UseStringCache, false, \
2281 "Enable String cache capabilities on String.java") \
2282 \
2283 /* statistics */ \
2284 develop(bool, UseVTune, false, \
2285 "enable support for Intel's VTune profiler") \
2286 \
2287 develop(bool, CountCompiledCalls, false, \
2288 "counts method invocations") \
2289 \
2290 notproduct(bool, CountRuntimeCalls, false, \
2291 "counts VM runtime calls") \
2292 \
2293 develop(bool, CountJNICalls, false, \
2294 "counts jni method invocations") \
2295 \
2296 notproduct(bool, CountJVMCalls, false, \
2297 "counts jvm method invocations") \
2298 \
2299 notproduct(bool, CountRemovableExceptions, false, \
2300 "count exceptions that could be replaced by branches due to " \
2301 "inlining") \
2302 \
2303 notproduct(bool, ICMissHistogram, false, \
2304 "produce histogram of IC misses") \
2305 \
2306 notproduct(bool, PrintClassStatistics, false, \
2307 "prints class statistics at end of run") \
2308 \
2309 notproduct(bool, PrintMethodStatistics, false, \
2310 "prints method statistics at end of run") \
2311 \
2312 /* interpreter */ \
2313 develop(bool, ClearInterpreterLocals, false, \
2314 "Always clear local variables of interpreter activations upon " \
2315 "entry") \
2316 \
2317 product_pd(bool, RewriteBytecodes, \
2318 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2319 \
2320 product_pd(bool, RewriteFrequentPairs, \
2321 "Rewrite frequently used bytecode pairs into a single bytecode") \
2322 \
2323 diagnostic(bool, PrintInterpreter, false, \
2324 "Prints the generated interpreter code") \
2325 \
2326 product(bool, UseInterpreter, true, \
2327 "Use interpreter for non-compiled methods") \
2328 \
2329 develop(bool, UseFastSignatureHandlers, true, \
2330 "Use fast signature handlers for native calls") \
2331 \
2332 develop(bool, UseV8InstrsOnly, false, \
2333 "Use SPARC-V8 Compliant instruction subset") \
2334 \
2335 product(bool, UseNiagaraInstrs, false, \
2336 "Use Niagara-efficient instruction subset") \
2337 \
2338 develop(bool, UseCASForSwap, false, \
2339 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2340 \
2341 product(bool, UseLoopCounter, true, \
2342 "Increment invocation counter on backward branch") \
2343 \
2344 product(bool, UseFastEmptyMethods, true, \
2345 "Use fast method entry code for empty methods") \
2346 \
2347 product(bool, UseFastAccessorMethods, true, \
2348 "Use fast method entry code for accessor methods") \
2349 \
2350 product_pd(bool, UseOnStackReplacement, \
2351 "Use on stack replacement, calls runtime if invoc. counter " \
2352 "overflows in loop") \
2353 \
2354 notproduct(bool, TraceOnStackReplacement, false, \
2355 "Trace on stack replacement") \
2356 \
2357 develop(bool, PoisonOSREntry, true, \
2358 "Detect abnormal calls to OSR code") \
2359 \
2360 product_pd(bool, PreferInterpreterNativeStubs, \
2361 "Use always interpreter stubs for native methods invoked via " \
2362 "interpreter") \
2363 \
2364 develop(bool, CountBytecodes, false, \
2365 "Count number of bytecodes executed") \
2366 \
2367 develop(bool, PrintBytecodeHistogram, false, \
2368 "Print histogram of the executed bytecodes") \
2369 \
2370 develop(bool, PrintBytecodePairHistogram, false, \
2371 "Print histogram of the executed bytecode pairs") \
2372 \
2373 diagnostic(bool, PrintSignatureHandlers, false, \
2374 "Print code generated for native method signature handlers") \
2375 \
2376 develop(bool, VerifyOops, false, \
2377 "Do plausibility checks for oops") \
2378 \
2379 develop(bool, CheckUnhandledOops, false, \
2380 "Check for unhandled oops in VM code") \
2381 \
2382 develop(bool, VerifyJNIFields, trueInDebug, \
2383 "Verify jfieldIDs for instance fields") \
2384 \
2385 notproduct(bool, VerifyJNIEnvThread, false, \
2386 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2387 "from JNI") \
2388 \
2389 develop(bool, VerifyFPU, false, \
2390 "Verify FPU state (check for NaN's, etc.)") \
2391 \
2392 develop(bool, VerifyThread, false, \
2393 "Watch the thread register for corruption (SPARC only)") \
2394 \
2395 develop(bool, VerifyActivationFrameSize, false, \
2396 "Verify that activation frame didn't become smaller than its " \
2397 "minimal size") \
2398 \
2399 develop(bool, TraceFrequencyInlining, false, \
2400 "Trace frequency based inlining") \
2401 \
2402 notproduct(bool, TraceTypeProfile, false, \
2403 "Trace type profile") \
2404 \
2405 develop_pd(bool, InlineIntrinsics, \
2406 "Inline intrinsics that can be statically resolved") \
2407 \
2408 product_pd(bool, ProfileInterpreter, \
2409 "Profile at the bytecode level during interpretation") \
2410 \
2411 develop_pd(bool, ProfileTraps, \
2412 "Profile deoptimization traps at the bytecode level") \
2413 \
2414 product(intx, ProfileMaturityPercentage, 20, \
2415 "number of method invocations/branches (expressed as % of " \
2416 "CompileThreshold) before using the method's profile") \
2417 \
2418 develop(bool, PrintMethodData, false, \
2419 "Print the results of +ProfileInterpreter at end of run") \
2420 \
2421 develop(bool, VerifyDataPointer, trueInDebug, \
2422 "Verify the method data pointer during interpreter profiling") \
2423 \
2424 develop(bool, VerifyCompiledCode, false, \
2425 "Include miscellaneous runtime verifications in nmethod code; " \
2426 "off by default because it disturbs nmethod size heuristics.") \
2427 \
2428 \
2429 /* compilation */ \
2430 product(bool, UseCompiler, true, \
2431 "use compilation") \
2432 \
2433 develop(bool, TraceCompilationPolicy, false, \
2434 "Trace compilation policy") \
2435 \
2436 develop(bool, TimeCompilationPolicy, false, \
2437 "Time the compilation policy") \
2438 \
2439 product(bool, UseCounterDecay, true, \
2440 "adjust recompilation counters") \
2441 \
2442 develop(intx, CounterHalfLifeTime, 30, \
2443 "half-life time of invocation counters (in secs)") \
2444 \
2445 develop(intx, CounterDecayMinIntervalLength, 500, \
2446 "Min. ms. between invocation of CounterDecay") \
2447 \
2448 product(bool, AlwaysCompileLoopMethods, false, \
2449 "when using recompilation, never interpret methods " \
2450 "containing loops") \
2451 \
2452 product(bool, DontCompileHugeMethods, true, \
2453 "don't compile methods > HugeMethodLimit") \
2454 \
2455 /* Bytecode escape analysis estimation. */ \
2456 product(bool, EstimateArgEscape, true, \
2457 "Analyze bytecodes to estimate escape state of arguments") \
2458 \
2459 product(intx, BCEATraceLevel, 0, \
2460 "How much tracing to do of bytecode escape analysis estimates") \
2461 \
2462 product(intx, MaxBCEAEstimateLevel, 5, \
2463 "Maximum number of nested calls that are analyzed by BC EA.") \
2464 \
2465 product(intx, MaxBCEAEstimateSize, 150, \
2466 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2467 \
2468 product(intx, AllocatePrefetchStyle, 1, \
2469 "0 = no prefetch, " \
2470 "1 = prefetch instructions for each allocation, " \
2471 "2 = use TLAB watermark to gate allocation prefetch") \
2472 \
2473 product(intx, AllocatePrefetchDistance, -1, \
2474 "Distance to prefetch ahead of allocation pointer") \
2475 \
2476 product(intx, AllocatePrefetchLines, 1, \
2477 "Number of lines to prefetch ahead of allocation pointer") \
2478 \
2479 product(intx, AllocatePrefetchStepSize, 16, \
2480 "Step size in bytes of sequential prefetch instructions") \
2481 \
2482 product(intx, AllocatePrefetchInstr, 0, \
2483 "Prefetch instruction to prefetch ahead of allocation pointer") \
2484 \
2485 product(intx, ReadPrefetchInstr, 0, \
2486 "Prefetch instruction to prefetch ahead") \
2487 \
2488 /* deoptimization */ \
2489 develop(bool, TraceDeoptimization, false, \
2490 "Trace deoptimization") \
2491 \
2492 develop(bool, DebugDeoptimization, false, \
2493 "Tracing various information while debugging deoptimization") \
2494 \
2495 product(intx, SelfDestructTimer, 0, \
2496 "Will cause VM to terminate after a given time (in minutes) " \
2497 "(0 means off)") \
2498 \
2499 product(intx, MaxJavaStackTraceDepth, 1024, \
2500 "Max. no. of lines in the stack trace for Java exceptions " \
2501 "(0 means all)") \
2502 \
2503 develop(intx, GuaranteedSafepointInterval, 1000, \
2504 "Guarantee a safepoint (at least) every so many milliseconds " \
2505 "(0 means none)") \
2506 \
2507 product(intx, SafepointTimeoutDelay, 10000, \
2508 "Delay in milliseconds for option SafepointTimeout") \
2509 \
2510 product(intx, NmethodSweepFraction, 4, \
2511 "Number of invocations of sweeper to cover all nmethods") \
2512 \
2513 notproduct(intx, MemProfilingInterval, 500, \
2514 "Time between each invocation of the MemProfiler") \
2515 \
2516 develop(intx, MallocCatchPtr, -1, \
2517 "Hit breakpoint when mallocing/freeing this pointer") \
2518 \
2519 notproduct(intx, AssertRepeat, 1, \
2520 "number of times to evaluate expression in assert " \
2521 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2522 \
2523 notproduct(ccstrlist, SuppressErrorAt, "", \
2524 "List of assertions (file:line) to muzzle") \
2525 \
2526 notproduct(uintx, HandleAllocationLimit, 1024, \
2527 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2528 "is used") \
2529 \
2530 develop(uintx, TotalHandleAllocationLimit, 1024, \
2531 "Threshold for total handle allocation when " \
2532 "+TraceHandleAllocation is used") \
2533 \
2534 develop(intx, StackPrintLimit, 100, \
2535 "number of stack frames to print in VM-level stack dump") \
2536 \
2537 notproduct(intx, MaxElementPrintSize, 256, \
2538 "maximum number of elements to print") \
2539 \
2540 notproduct(intx, MaxSubklassPrintSize, 4, \
2541 "maximum number of subklasses to print when printing klass") \
2542 \
2543 develop(intx, MaxInlineLevel, 9, \
2544 "maximum number of nested calls that are inlined") \
2545 \
2546 develop(intx, MaxRecursiveInlineLevel, 1, \
2547 "maximum number of nested recursive calls that are inlined") \
2548 \
2549 product(intx, InlineSmallCode, 1000, \
2550 "Only inline already compiled methods if their code size is " \
2551 "less than this") \
2552 \
2553 product(intx, MaxInlineSize, 35, \
2554 "maximum bytecode size of a method to be inlined") \
2555 \
2556 product_pd(intx, FreqInlineSize, \
2557 "maximum bytecode size of a frequent method to be inlined") \
2558 \
2559 develop(intx, MaxTrivialSize, 6, \
2560 "maximum bytecode size of a trivial method to be inlined") \
2561 \
2562 develop(intx, MinInliningThreshold, 250, \
2563 "min. invocation count a method needs to have to be inlined") \
2564 \
2565 develop(intx, AlignEntryCode, 4, \
2566 "aligns entry code to specified value (in bytes)") \
2567 \
2568 develop(intx, MethodHistogramCutoff, 100, \
2569 "cutoff value for method invoc. histogram (+CountCalls)") \
2570 \
2571 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2572 "# of interpreted methods to show in profile") \
2573 \
2574 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2575 "# of compiled methods to show in profile") \
2576 \
2577 develop(intx, ProfilerNumberOfStubMethods, 25, \
2578 "# of stub methods to show in profile") \
2579 \
2580 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2581 "# of runtime stub nodes to show in profile") \
2582 \
2583 product(intx, ProfileIntervalsTicks, 100, \
2584 "# of ticks between printing of interval profile " \
2585 "(+ProfileIntervals)") \
2586 \
2587 notproduct(intx, ScavengeALotInterval, 1, \
2588 "Interval between which scavenge will occur with +ScavengeALot") \
2589 \
2590 notproduct(intx, FullGCALotInterval, 1, \
2591 "Interval between which full gc will occur with +FullGCALot") \
2592 \
2593 notproduct(intx, FullGCALotStart, 0, \
2594 "For which invocation to start FullGCAlot") \
2595 \
2596 notproduct(intx, FullGCALotDummies, 32*K, \
2597 "Dummy object allocated with +FullGCALot, forcing all objects " \
2598 "to move") \
2599 \
2600 develop(intx, DontYieldALotInterval, 10, \
2601 "Interval between which yields will be dropped (milliseconds)") \
2602 \
2603 develop(intx, MinSleepInterval, 1, \
2604 "Minimum sleep() interval (milliseconds) when " \
2605 "ConvertSleepToYield is off (used for SOLARIS)") \
2606 \
2607 product(intx, EventLogLength, 2000, \
2608 "maximum nof events in event log") \
2609 \
2610 develop(intx, ProfilerPCTickThreshold, 15, \
2611 "Number of ticks in a PC buckets to be a hotspot") \
2612 \
2613 notproduct(intx, DeoptimizeALotInterval, 5, \
2614 "Number of exits until DeoptimizeALot kicks in") \
2615 \
2616 notproduct(intx, ZombieALotInterval, 5, \
2617 "Number of exits until ZombieALot kicks in") \
2618 \
2619 develop(bool, StressNonEntrant, false, \
2620 "Mark nmethods non-entrant at registration") \
2621 \
2622 diagnostic(intx, MallocVerifyInterval, 0, \
2623 "if non-zero, verify C heap after every N calls to " \
2624 "malloc/realloc/free") \
2625 \
2626 diagnostic(intx, MallocVerifyStart, 0, \
2627 "if non-zero, start verifying C heap after Nth call to " \
2628 "malloc/realloc/free") \
2629 \
2630 product(intx, TypeProfileWidth, 2, \
2631 "number of receiver types to record in call/cast profile") \
2632 \
2633 develop(intx, BciProfileWidth, 2, \
2634 "number of return bci's to record in ret profile") \
2635 \
2636 product(intx, PerMethodRecompilationCutoff, 400, \
2637 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2638 \
2639 product(intx, PerBytecodeRecompilationCutoff, 100, \
2640 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2641 \
2642 product(intx, PerMethodTrapLimit, 100, \
2643 "Limit on traps (of one kind) in a method (includes inlines)") \
2644 \
2645 product(intx, PerBytecodeTrapLimit, 4, \
2646 "Limit on traps (of one kind) at a particular BCI") \
2647 \
2648 develop(intx, FreqCountInvocations, 1, \
2649 "Scaling factor for branch frequencies (deprecated)") \
2650 \
2651 develop(intx, InlineFrequencyRatio, 20, \
2652 "Ratio of call site execution to caller method invocation") \
2653 \
2654 develop_pd(intx, InlineFrequencyCount, \
2655 "Count of call site execution necessary to trigger frequent " \
2656 "inlining") \
2657 \
2658 develop(intx, InlineThrowCount, 50, \
2659 "Force inlining of interpreted methods that throw this often") \
2660 \
2661 develop(intx, InlineThrowMaxSize, 200, \
2662 "Force inlining of throwing methods smaller than this") \
2663 \
2664 product(intx, AliasLevel, 3, \
2665 "0 for no aliasing, 1 for oop/field/static/array split, " \
2666 "2 for class split, 3 for unique instances") \
2667 \
2668 develop(bool, VerifyAliases, false, \
2669 "perform extra checks on the results of alias analysis") \
2670 \
2671 develop(intx, ProfilerNodeSize, 1024, \
2672 "Size in K to allocate for the Profile Nodes of each thread") \
2673 \
2674 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
2675 "Number of times to spin wait on a v8 atomic operation lock") \
2676 \
2677 product(intx, ReadSpinIterations, 100, \
2678 "Number of read attempts before a yield (spin inner loop)") \
2679 \
2680 product_pd(intx, PreInflateSpin, \
2681 "Number of times to spin wait before inflation") \
2682 \
2683 product(intx, PreBlockSpin, 10, \
2684 "Number of times to spin in an inflated lock before going to " \
2685 "an OS lock") \
2686 \
2687 /* gc parameters */ \
2688 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \
2689 "Default maximum size for object heap (in bytes)") \
2690 \
2691 product_pd(uintx, NewSize, \
2692 "Default size of new generation (in bytes)") \
2693 \
2694 product(uintx, MaxNewSize, max_uintx, \
2695 "Maximum size of new generation (in bytes)") \
2696 \
2697 product(uintx, PretenureSizeThreshold, 0, \
2698 "Max size in bytes of objects allocated in DefNew generation") \
2699 \
2700 product_pd(uintx, TLABSize, \
2701 "Default (or starting) size of TLAB (in bytes)") \
2702 \
2703 product(uintx, MinTLABSize, 2*K, \
2704 "Minimum allowed TLAB size (in bytes)") \
2705 \
2706 product(uintx, TLABAllocationWeight, 35, \
2707 "Allocation averaging weight") \
2708 \
2709 product(uintx, TLABWasteTargetPercent, 1, \
2710 "Percentage of Eden that can be wasted") \
2711 \
2712 product(uintx, TLABRefillWasteFraction, 64, \
2713 "Max TLAB waste at a refill (internal fragmentation)") \
2714 \
2715 product(uintx, TLABWasteIncrement, 4, \
2716 "Increment allowed waste at slow allocation") \
2717 \
2718 product_pd(intx, SurvivorRatio, \
2719 "Ratio of eden/survivor space size") \
2720 \
2721 product_pd(intx, NewRatio, \
2722 "Ratio of new/old generation sizes") \
2723 \
2724 product(uintx, MaxLiveObjectEvacuationRatio, 100, \
2725 "Max percent of eden objects that will be live at scavenge") \
2726 \
2727 product_pd(uintx, NewSizeThreadIncrease, \
2728 "Additional size added to desired new generation size per " \
2729 "non-daemon thread (in bytes)") \
2730 \
2731 product(uintx, OldSize, ScaleForWordSize(4096*K), \
2732 "Default size of tenured generation (in bytes)") \
2733 \
2734 product_pd(uintx, PermSize, \
2735 "Default size of permanent generation (in bytes)") \
2736 \
2737 product_pd(uintx, MaxPermSize, \
2738 "Maximum size of permanent generation (in bytes)") \
2739 \
2740 product(uintx, MinHeapFreeRatio, 40, \
2741 "Min percentage of heap free after GC to avoid expansion") \
2742 \
2743 product(uintx, MaxHeapFreeRatio, 70, \
2744 "Max percentage of heap free after GC to avoid shrinking") \
2745 \
2746 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
2747 "Number of milliseconds per MB of free space in the heap") \
2748 \
2749 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
2750 "Min change in heap space due to GC (in bytes)") \
2751 \
2752 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
2753 "Min expansion of permanent heap (in bytes)") \
2754 \
2755 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
2756 "Max expansion of permanent heap without full GC (in bytes)") \
2757 \
2758 product(intx, QueuedAllocationWarningCount, 0, \
2759 "Number of times an allocation that queues behind a GC " \
2760 "will retry before printing a warning") \
2761 \
2762 diagnostic(uintx, VerifyGCStartAt, 0, \
2763 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
2764 \
2765 diagnostic(intx, VerifyGCLevel, 0, \
2766 "Generation level at which to start +VerifyBefore/AfterGC") \
2767 \
2768 develop(uintx, ExitAfterGCNum, 0, \
2769 "If non-zero, exit after this GC.") \
2770 \
2771 product(intx, MaxTenuringThreshold, 15, \
2772 "Maximum value for tenuring threshold") \
2773 \
2774 product(intx, InitialTenuringThreshold, 7, \
2775 "Initial value for tenuring threshold") \
2776 \
2777 product(intx, TargetSurvivorRatio, 50, \
2778 "Desired percentage of survivor space used after scavenge") \
2779 \
2780 product(intx, MarkSweepDeadRatio, 5, \
2781 "Percentage (0-100) of the old gen allowed as dead wood." \
2782 "Serial mark sweep treats this as both the min and max value." \
2783 "CMS uses this value only if it falls back to mark sweep." \
2784 "Par compact uses a variable scale based on the density of the" \
2785 "generation and treats this as the max value when the heap is" \
2786 "either completely full or completely empty. Par compact also" \
2787 "has a smaller default value; see arguments.cpp.") \
2788 \
2789 product(intx, PermMarkSweepDeadRatio, 20, \
2790 "Percentage (0-100) of the perm gen allowed as dead wood." \
2791 "See MarkSweepDeadRatio for collector-specific comments.") \
2792 \
2793 product(intx, MarkSweepAlwaysCompactCount, 4, \
2794 "How often should we fully compact the heap (ignoring the dead " \
2795 "space parameters)") \
2796 \
2797 product(intx, PrintCMSStatistics, 0, \
2798 "Statistics for CMS") \
2799 \
2800 product(bool, PrintCMSInitiationStatistics, false, \
2801 "Statistics for initiating a CMS collection") \
2802 \
2803 product(intx, PrintFLSStatistics, 0, \
2804 "Statistics for CMS' FreeListSpace") \
2805 \
2806 product(intx, PrintFLSCensus, 0, \
2807 "Census for CMS' FreeListSpace") \
2808 \
2809 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
2810 "Delay in ms between expansion and allocation") \
2811 \
2812 product(intx, DeferThrSuspendLoopCount, 4000, \
2813 "(Unstable) Number of times to iterate in safepoint loop " \
2814 " before blocking VM threads ") \
2815 \
2816 product(intx, DeferPollingPageLoopCount, -1, \
2817 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
2818 "before changing safepoint polling page to RO ") \
2819 \
2820 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
2821 \
2822 product(bool, UseDepthFirstScavengeOrder, true, \
2823 "true: the scavenge order will be depth-first, " \
2824 "false: the scavenge order will be breadth-first") \
2825 \
2826 product(bool, PSChunkLargeArrays, true, \
2827 "true: process large arrays in chunks") \
2828 \
2829 product(uintx, GCDrainStackTargetSize, 64, \
2830 "how many entries we'll try to leave on the stack during " \
2831 "parallel GC") \
2832 \
2833 product(intx, DCQBarrierQueueBufferSize, 256, \
2834 "Number of elements in a dirty card queue buffer") \
2835 \
2836 product(intx, DCQBarrierProcessCompletedThreshold, 5, \
2837 "Number of completed dirty card buffers to trigger processing.") \
2838 \
2839 /* stack parameters */ \
2840 product_pd(intx, StackYellowPages, \
2841 "Number of yellow zone (recoverable overflows) pages") \
2842 \
2843 product_pd(intx, StackRedPages, \
2844 "Number of red zone (unrecoverable overflows) pages") \
2845 \
2846 product_pd(intx, StackShadowPages, \
2847 "Number of shadow zone (for overflow checking) pages" \
2848 " this should exceed the depth of the VM and native call stack") \
2849 \
2850 product_pd(intx, ThreadStackSize, \
2851 "Thread Stack Size (in Kbytes)") \
2852 \
2853 product_pd(intx, VMThreadStackSize, \
2854 "Non-Java Thread Stack Size (in Kbytes)") \
2855 \
2856 product_pd(intx, CompilerThreadStackSize, \
2857 "Compiler Thread Stack Size (in Kbytes)") \
2858 \
2859 develop_pd(uintx, JVMInvokeMethodSlack, \
2860 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
2861 \
2862 product(uintx, ThreadSafetyMargin, 50*M, \
2863 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
2864 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
2865 "disable this feature") \
2866 \
2867 /* code cache parameters */ \
2868 develop(uintx, CodeCacheSegmentSize, 64, \
2869 "Code cache segment size (in bytes) - smallest unit of " \
2870 "allocation") \
2871 \
2872 develop_pd(intx, CodeEntryAlignment, \
2873 "Code entry alignment for generated code (in bytes)") \
2874 \
2875 product_pd(uintx, InitialCodeCacheSize, \
2876 "Initial code cache size (in bytes)") \
2877 \
2878 product_pd(uintx, ReservedCodeCacheSize, \
2879 "Reserved code cache size (in bytes) - maximum code cache size") \
2880 \
2881 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
2882 "When less than X space left, we stop compiling.") \
2883 \
2884 product_pd(uintx, CodeCacheExpansionSize, \
2885 "Code cache expansion size (in bytes)") \
2886 \
2887 develop_pd(uintx, CodeCacheMinBlockLength, \
2888 "Minimum number of segments in a code cache block.") \
2889 \
2890 notproduct(bool, ExitOnFullCodeCache, false, \
2891 "Exit the VM if we fill the code cache.") \
2892 \
2893 /* interpreter debugging */ \
2894 develop(intx, BinarySwitchThreshold, 5, \
2895 "Minimal number of lookupswitch entries for rewriting to binary " \
2896 "switch") \
2897 \
2898 develop(intx, StopInterpreterAt, 0, \
2899 "Stops interpreter execution at specified bytecode number") \
2900 \
2901 develop(intx, TraceBytecodesAt, 0, \
2902 "Traces bytecodes starting with specified bytecode number") \
2903 \
2904 /* compiler interface */ \
2905 develop(intx, CIStart, 0, \
2906 "the id of the first compilation to permit") \
2907 \
2908 develop(intx, CIStop, -1, \
2909 "the id of the last compilation to permit") \
2910 \
2911 develop(intx, CIStartOSR, 0, \
2912 "the id of the first osr compilation to permit " \
2913 "(CICountOSR must be on)") \
2914 \
2915 develop(intx, CIStopOSR, -1, \
2916 "the id of the last osr compilation to permit " \
2917 "(CICountOSR must be on)") \
2918 \
2919 develop(intx, CIBreakAtOSR, -1, \
2920 "id of osr compilation to break at") \
2921 \
2922 develop(intx, CIBreakAt, -1, \
2923 "id of compilation to break at") \
2924 \
2925 product(ccstrlist, CompileOnly, "", \
2926 "List of methods (pkg/class.name) to restrict compilation to") \
2927 \
2928 product(ccstr, CompileCommandFile, NULL, \
2929 "Read compiler commands from this file [.hotspot_compiler]") \
2930 \
2931 product(ccstrlist, CompileCommand, "", \
2932 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2933 \
2934 product(bool, CICompilerCountPerCPU, false, \
2935 "1 compiler thread for log(N CPUs)") \
2936 \
2937 develop(intx, CIFireOOMAt, -1, \
2938 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
2939 "(non-negative value throws OOM after this many CI accesses " \
2940 "in each compile)") \
2941 \
2942 develop(intx, CIFireOOMAtDelay, -1, \
2943 "Wait for this many CI accesses to occur in all compiles before " \
2944 "beginning to throw OutOfMemoryErrors in each compile") \
2945 \
2946 /* Priorities */ \
2947 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
2948 \
2949 product(intx, ThreadPriorityPolicy, 0, \
2950 "0 : Normal. "\
2951 " VM chooses priorities that are appropriate for normal "\
2952 " applications. On Solaris NORM_PRIORITY and above are mapped "\
2953 " to normal native priority. Java priorities below NORM_PRIORITY"\
2954 " map to lower native priority values. On Windows applications"\
2955 " are allowed to use higher native priorities. However, with "\
2956 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
2957 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
2958 " interfere with system threads. On Linux thread priorities "\
2959 " are ignored because the OS does not support static priority "\
2960 " in SCHED_OTHER scheduling class which is the only choice for"\
2961 " non-root, non-realtime applications. "\
2962 "1 : Aggressive. "\
2963 " Java thread priorities map over to the entire range of "\
2964 " native thread priorities. Higher Java thread priorities map "\
2965 " to higher native thread priorities. This policy should be "\
2966 " used with care, as sometimes it can cause performance "\
2967 " degradation in the application and/or the entire system. On "\
2968 " Linux this policy requires root privilege.") \
2969 \
2970 product(bool, ThreadPriorityVerbose, false, \
2971 "print priority changes") \
2972 \
2973 product(intx, DefaultThreadPriority, -1, \
2974 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
2975 \
2976 product(intx, CompilerThreadPriority, -1, \
2977 "what priority should compiler threads run at (-1 means no change)") \
2978 \
2979 product(intx, VMThreadPriority, -1, \
2980 "what priority should VM threads run at (-1 means no change)") \
2981 \
2982 product(bool, CompilerThreadHintNoPreempt, true, \
2983 "(Solaris only) Give compiler threads an extra quanta") \
2984 \
2985 product(bool, VMThreadHintNoPreempt, false, \
2986 "(Solaris only) Give VM thread an extra quanta") \
2987 \
2988 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2989 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2990 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2991 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2992 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2993 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2994 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2995 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2996 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2997 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
2998 \
2999 /* compiler debugging */ \
3000 notproduct(intx, CompileTheWorldStartAt, 1, \
3001 "First class to consider when using +CompileTheWorld") \
3002 \
3003 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3004 "Last class to consider when using +CompileTheWorld") \
3005 \
3006 develop(intx, NewCodeParameter, 0, \
3007 "Testing Only: Create a dedicated integer parameter before " \
3008 "putback") \
3009 \
3010 /* new oopmap storage allocation */ \
3011 develop(intx, MinOopMapAllocation, 8, \
3012 "Minimum number of OopMap entries in an OopMapSet") \
3013 \
3014 /* Background Compilation */ \
3015 develop(intx, LongCompileThreshold, 50, \
3016 "Used with +TraceLongCompiles") \
3017 \
3018 product(intx, StarvationMonitorInterval, 200, \
3019 "Pause between each check in ms") \
3020 \
3021 /* recompilation */ \
3022 product_pd(intx, CompileThreshold, \
3023 "number of interpreted method invocations before (re-)compiling") \
3024 \
3025 product_pd(intx, BackEdgeThreshold, \
3026 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3027 \
3028 product(intx, Tier1BytecodeLimit, 10, \
3029 "Must have at least this many bytecodes before tier1" \
3030 "invocation counters are used") \
3031 \
3032 product_pd(intx, Tier2CompileThreshold, \
3033 "threshold at which a tier 2 compilation is invoked") \
3034 \
3035 product_pd(intx, Tier2BackEdgeThreshold, \
3036 "Back edge threshold at which a tier 2 compilation is invoked") \
3037 \
3038 product_pd(intx, Tier3CompileThreshold, \
3039 "threshold at which a tier 3 compilation is invoked") \
3040 \
3041 product_pd(intx, Tier3BackEdgeThreshold, \
3042 "Back edge threshold at which a tier 3 compilation is invoked") \
3043 \
3044 product_pd(intx, Tier4CompileThreshold, \
3045 "threshold at which a tier 4 compilation is invoked") \
3046 \
3047 product_pd(intx, Tier4BackEdgeThreshold, \
3048 "Back edge threshold at which a tier 4 compilation is invoked") \
3049 \
3050 product_pd(bool, TieredCompilation, \
3051 "Enable two-tier compilation") \
3052 \
3053 product(bool, StressTieredRuntime, false, \
3054 "Alternate client and server compiler on compile requests") \
3055 \
3056 product_pd(intx, OnStackReplacePercentage, \
3057 "NON_TIERED number of method invocations/branches (expressed as %"\
3058 "of CompileThreshold) before (re-)compiling OSR code") \
3059 \
3060 product(intx, InterpreterProfilePercentage, 33, \
3061 "NON_TIERED number of method invocations/branches (expressed as %"\
3062 "of CompileThreshold) before profiling in the interpreter") \
3063 \
3064 develop(intx, MaxRecompilationSearchLength, 10, \
3065 "max. # frames to inspect searching for recompilee") \
3066 \
3067 develop(intx, MaxInterpretedSearchLength, 3, \
3068 "max. # interp. frames to skip when searching for recompilee") \
3069 \
3070 develop(intx, DesiredMethodLimit, 8000, \
3071 "desired max. method size (in bytecodes) after inlining") \
3072 \
3073 develop(intx, HugeMethodLimit, 8000, \
3074 "don't compile methods larger than this if " \
3075 "+DontCompileHugeMethods") \
3076 \
3077 /* New JDK 1.4 reflection implementation */ \
3078 \
3079 develop(bool, UseNewReflection, true, \
3080 "Temporary flag for transition to reflection based on dynamic " \
3081 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3082 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3083 "changes were needed") \
3084 \
3085 develop(bool, VerifyReflectionBytecodes, false, \
3086 "Force verification of 1.4 reflection bytecodes. Does not work " \
3087 "in situations like that described in 4486457 or for " \
3088 "constructors generated for serialization, so can not be enabled "\
3089 "in product.") \
3090 \
3091 product(bool, ReflectionWrapResolutionErrors, true, \
3092 "Temporary flag for transition to AbstractMethodError wrapped " \
3093 "in InvocationTargetException. See 6531596") \
3094 \
3095 \
3096 develop(intx, FastSuperclassLimit, 8, \
3097 "Depth of hardwired instanceof accelerator array") \
3098 \
3099 /* Properties for Java libraries */ \
3100 \
3101 product(intx, MaxDirectMemorySize, -1, \
3102 "Maximum total size of NIO direct-buffer allocations") \
3103 \
3104 /* temporary developer defined flags */ \
3105 \
3106 diagnostic(bool, UseNewCode, false, \
3107 "Testing Only: Use the new version while testing") \
3108 \
3109 diagnostic(bool, UseNewCode2, false, \
3110 "Testing Only: Use the new version while testing") \
3111 \
3112 diagnostic(bool, UseNewCode3, false, \
3113 "Testing Only: Use the new version while testing") \
3114 \
3115 /* flags for performance data collection */ \
3116 \
3117 product(bool, UsePerfData, true, \
3118 "Flag to disable jvmstat instrumentation for performance testing" \
3119 "and problem isolation purposes.") \
3120 \
3121 product(bool, PerfDataSaveToFile, false, \
3122 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3123 \
3124 product(ccstr, PerfDataSaveFile, NULL, \
3125 "Save PerfData memory to the specified absolute pathname," \
3126 "%p in the file name if present will be replaced by pid") \
3127 \
3128 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3129 "Data sampling interval in milliseconds") \
3130 \
3131 develop(bool, PerfTraceDataCreation, false, \
3132 "Trace creation of Performance Data Entries") \
3133 \
3134 develop(bool, PerfTraceMemOps, false, \
3135 "Trace PerfMemory create/attach/detach calls") \
3136 \
3137 product(bool, PerfDisableSharedMem, false, \
3138 "Store performance data in standard memory") \
3139 \
3140 product(intx, PerfDataMemorySize, 32*K, \
3141 "Size of performance data memory region. Will be rounded " \
3142 "up to a multiple of the native os page size.") \
3143 \
3144 product(intx, PerfMaxStringConstLength, 1024, \
3145 "Maximum PerfStringConstant string length before truncation") \
3146 \
3147 product(bool, PerfAllowAtExitRegistration, false, \
3148 "Allow registration of atexit() methods") \
3149 \
3150 product(bool, PerfBypassFileSystemCheck, false, \
3151 "Bypass Win32 file system criteria checks (Windows Only)") \
3152 \
3153 product(intx, UnguardOnExecutionViolation, 0, \
3154 "Unguard page and retry on no-execute fault (Win32 only)" \
3155 "0=off, 1=conservative, 2=aggressive") \
3156 \
3157 /* Serviceability Support */ \
3158 \
3159 product(bool, ManagementServer, false, \
3160 "Create JMX Management Server") \
3161 \
3162 product(bool, DisableAttachMechanism, false, \
3163 "Disable mechanism that allows tools to attach to this VM") \
3164 \
3165 product(bool, StartAttachListener, false, \
3166 "Always start Attach Listener at VM startup") \
3167 \
3168 manageable(bool, PrintConcurrentLocks, false, \
3169 "Print java.util.concurrent locks in thread dump") \
3170 \
3171 /* Shared spaces */ \
3172 \
3173 product(bool, UseSharedSpaces, true, \
3174 "Use shared spaces in the permanent generation") \
3175 \
3176 product(bool, RequireSharedSpaces, false, \
3177 "Require shared spaces in the permanent generation") \
3178 \
3179 product(bool, ForceSharedSpaces, false, \
3180 "Require shared spaces in the permanent generation") \
3181 \
3182 product(bool, DumpSharedSpaces, false, \
3183 "Special mode: JVM reads a class list, loads classes, builds " \
3184 "shared spaces, and dumps the shared spaces to a file to be " \
3185 "used in future JVM runs.") \
3186 \
3187 product(bool, PrintSharedSpaces, false, \
3188 "Print usage of shared spaces") \
3189 \
3190 product(uintx, SharedDummyBlockSize, 512*M, \
3191 "Size of dummy block used to shift heap addresses (in bytes)") \
3192 \
3193 product(uintx, SharedReadWriteSize, 12*M, \
3194 "Size of read-write space in permanent generation (in bytes)") \
3195 \
3196 product(uintx, SharedReadOnlySize, 8*M, \
3197 "Size of read-only space in permanent generation (in bytes)") \
3198 \
3199 product(uintx, SharedMiscDataSize, 4*M, \
3200 "Size of the shared data area adjacent to the heap (in bytes)") \
3201 \
3202 product(uintx, SharedMiscCodeSize, 4*M, \
3203 "Size of the shared code area adjacent to the heap (in bytes)") \
3204 \
3205 diagnostic(bool, SharedOptimizeColdStart, true, \
3206 "At dump time, order shared objects to achieve better " \
3207 "cold startup time.") \
3208 \
3209 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3210 "Reordering policy for SharedOptimizeColdStart " \
3211 "0=favor classload-time locality, 1=balanced, " \
3212 "2=favor runtime locality") \
3213 \
3214 diagnostic(bool, SharedSkipVerify, false, \
3215 "Skip assert() and verify() which page-in unwanted shared " \
3216 "objects. ") \
3217 \
3218 product(bool, TaggedStackInterpreter, false, \
3219 "Insert tags in interpreter execution stack for oopmap generaion")\
3220 \
3221 diagnostic(bool, PauseAtStartup, false, \
3222 "Causes the VM to pause at startup time and wait for the pause " \
3223 "file to be removed (default: ./vm.paused.<pid>)") \
3224 \
3225 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3226 "The file to create and for whose removal to await when pausing " \
3227 "at startup. (default: ./vm.paused.<pid>)") \
3228 \
3229 product(bool, ExtendedDTraceProbes, false, \
3230 "Enable performance-impacting dtrace probes") \
3231 \
3232 product(bool, DTraceMethodProbes, false, \
3233 "Enable dtrace probes for method-entry and method-exit") \
3234 \
3235 product(bool, DTraceAllocProbes, false, \
3236 "Enable dtrace probes for object allocation") \
3237 \
3238 product(bool, DTraceMonitorProbes, false, \
3239 "Enable dtrace probes for monitor events") \
3240 \
3241 product(bool, RelaxAccessControlCheck, false, \
3242 "Relax the access control checks in the verifier") \
3243 \
3244 diagnostic(bool, PrintDTraceDOF, false, \
3245 "Print the DTrace DOF passed to the system for JSDT probes") \
3246 \
3247 product(bool, UseVMInterruptibleIO, true, \
3248 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3249 "EINTR for I/O operations results in OS_INTRPT")
3250
3251
3252 /*
3253 * Macros for factoring of globals
3254 */
3255
3256 // Interface macros
3257 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3258 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3259 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3260 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3261 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3262 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3263 #ifdef PRODUCT
3264 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3265 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3266 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3267 #else
3268 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3269 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3270 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3271 #endif
3272 // Special LP64 flags, product only needed for now.
3273 #ifdef _LP64
3274 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3275 #else
3276 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3277 #endif // _LP64
3278
3279 // Implementation macros
3280 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3281 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3282 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3283 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3284 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3285 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3286 #ifdef PRODUCT
3287 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3288 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3289 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3290 #else
3291 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3292 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3293 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3294 #endif
3295 #ifdef _LP64
3296 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3297 #else
3298 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3299 #endif // _LP64
3300
3301 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
3303 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)