Mon, 23 Jun 2008 14:11:12 -0700
6708714: Optimize long LShift on 32-bits x86
Summary: For small (1-3 bits) left long shifts in 32-bits VM use sets of add+addc instructions instead of shld+shl on new AMD cpus.
Reviewed-by: never
Contributed-by: shrinivas.joshi@amd.com
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #if !defined(COMPILER1) && !defined(COMPILER2)
26 define_pd_global(bool, BackgroundCompilation, false);
27 define_pd_global(bool, UseTLAB, false);
28 define_pd_global(bool, CICompileOSR, false);
29 define_pd_global(bool, UseTypeProfile, false);
30 define_pd_global(bool, UseOnStackReplacement, false);
31 define_pd_global(bool, InlineIntrinsics, false);
32 define_pd_global(bool, PreferInterpreterNativeStubs, true);
33 define_pd_global(bool, ProfileInterpreter, false);
34 define_pd_global(bool, ProfileTraps, false);
35 define_pd_global(bool, TieredCompilation, false);
37 define_pd_global(intx, CompileThreshold, 0);
38 define_pd_global(intx, Tier2CompileThreshold, 0);
39 define_pd_global(intx, Tier3CompileThreshold, 0);
40 define_pd_global(intx, Tier4CompileThreshold, 0);
42 define_pd_global(intx, BackEdgeThreshold, 0);
43 define_pd_global(intx, Tier2BackEdgeThreshold, 0);
44 define_pd_global(intx, Tier3BackEdgeThreshold, 0);
45 define_pd_global(intx, Tier4BackEdgeThreshold, 0);
47 define_pd_global(intx, OnStackReplacePercentage, 0);
48 define_pd_global(bool, ResizeTLAB, false);
49 define_pd_global(intx, FreqInlineSize, 0);
50 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
51 define_pd_global(intx, NewRatio, 4);
52 define_pd_global(intx, InlineClassNatives, true);
53 define_pd_global(intx, InlineUnsafeOps, true);
54 define_pd_global(intx, InitialCodeCacheSize, 160*K);
55 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
56 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
57 define_pd_global(intx, CodeCacheMinBlockLength, 1);
58 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
59 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
60 define_pd_global(bool, NeverActAsServerClassMachine, true);
61 define_pd_global(uintx, DefaultMaxRAM, 1*G);
62 #define CI_COMPILER_COUNT 0
63 #else
65 #ifdef COMPILER2
66 #define CI_COMPILER_COUNT 2
67 #else
68 #define CI_COMPILER_COUNT 1
69 #endif // COMPILER2
71 #endif // no compilers
74 // string type aliases used only in this file
75 typedef const char* ccstr;
76 typedef const char* ccstrlist; // represents string arguments which accumulate
78 enum FlagValueOrigin {
79 DEFAULT = 0,
80 COMMAND_LINE = 1,
81 ENVIRON_VAR = 2,
82 CONFIG_FILE = 3,
83 MANAGEMENT = 4,
84 ERGONOMIC = 5,
85 ATTACH_ON_DEMAND = 6,
86 INTERNAL = 99
87 };
89 struct Flag {
90 const char *type;
91 const char *name;
92 void* addr;
93 const char *kind;
94 FlagValueOrigin origin;
96 // points to all Flags static array
97 static Flag *flags;
99 // number of flags
100 static size_t numFlags;
102 static Flag* find_flag(char* name, size_t length);
104 bool is_bool() const { return strcmp(type, "bool") == 0; }
105 bool get_bool() const { return *((bool*) addr); }
106 void set_bool(bool value) { *((bool*) addr) = value; }
108 bool is_intx() const { return strcmp(type, "intx") == 0; }
109 intx get_intx() const { return *((intx*) addr); }
110 void set_intx(intx value) { *((intx*) addr) = value; }
112 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
113 uintx get_uintx() const { return *((uintx*) addr); }
114 void set_uintx(uintx value) { *((uintx*) addr) = value; }
116 bool is_double() const { return strcmp(type, "double") == 0; }
117 double get_double() const { return *((double*) addr); }
118 void set_double(double value) { *((double*) addr) = value; }
120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
122 ccstr get_ccstr() const { return *((ccstr*) addr); }
123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
125 bool is_unlocker() const;
126 bool is_unlocked() const;
127 bool is_writeable() const;
128 bool is_external() const;
130 void print_on(outputStream* st);
131 void print_as_flag(outputStream* st);
132 };
134 // debug flags control various aspects of the VM and are global accessible
136 // use FlagSetting to temporarily change some debug flag
137 // e.g. FlagSetting fs(DebugThisAndThat, true);
138 // restored to previous value upon leaving scope
139 class FlagSetting {
140 bool val;
141 bool* flag;
142 public:
143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
144 ~FlagSetting() { *flag = val; }
145 };
148 class CounterSetting {
149 intx* counter;
150 public:
151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
152 ~CounterSetting() { (*counter)--; }
153 };
156 class IntFlagSetting {
157 intx val;
158 intx* flag;
159 public:
160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
161 ~IntFlagSetting() { *flag = val; }
162 };
165 class DoubleFlagSetting {
166 double val;
167 double* flag;
168 public:
169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
170 ~DoubleFlagSetting() { *flag = val; }
171 };
174 class CommandLineFlags {
175 public:
176 static bool boolAt(char* name, size_t len, bool* value);
177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
181 static bool intxAt(char* name, size_t len, intx* value);
182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
186 static bool uintxAt(char* name, size_t len, uintx* value);
187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
191 static bool doubleAt(char* name, size_t len, double* value);
192 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
193 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
194 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
196 static bool ccstrAt(char* name, size_t len, ccstr* value);
197 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
198 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
199 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
201 // Returns false if name is not a command line flag.
202 static bool wasSetOnCmdline(const char* name, bool* value);
203 static void printSetFlags();
205 static void printFlags() PRODUCT_RETURN;
207 static void verify() PRODUCT_RETURN;
208 };
210 // use this for flags that are true by default in the debug version but
211 // false in the optimized version, and vice versa
212 #ifdef ASSERT
213 #define trueInDebug true
214 #define falseInDebug false
215 #else
216 #define trueInDebug false
217 #define falseInDebug true
218 #endif
220 // use this for flags that are true per default in the product build
221 // but false in development builds, and vice versa
222 #ifdef PRODUCT
223 #define trueInProduct true
224 #define falseInProduct false
225 #else
226 #define trueInProduct false
227 #define falseInProduct true
228 #endif
230 // use this for flags that are true per default in the tiered build
231 // but false in non-tiered builds, and vice versa
232 #ifdef TIERED
233 #define trueInTiered true
234 #define falseInTiered false
235 #else
236 #define trueInTiered false
237 #define falseInTiered true
238 #endif
240 // develop flags are settable / visible only during development and are constant in the PRODUCT version
241 // product flags are always settable / visible
242 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
244 // A flag must be declared with one of the following types:
245 // bool, intx, uintx, ccstr.
246 // The type "ccstr" is an alias for "const char*" and is used
247 // only in this file, because the macrology requires single-token type names.
249 // Note: Diagnostic options not meant for VM tuning or for product modes.
250 // They are to be used for VM quality assurance or field diagnosis
251 // of VM bugs. They are hidden so that users will not be encouraged to
252 // try them as if they were VM ordinary execution options. However, they
253 // are available in the product version of the VM. Under instruction
254 // from support engineers, VM customers can turn them on to collect
255 // diagnostic information about VM problems. To use a VM diagnostic
256 // option, you must first specify +UnlockDiagnosticVMOptions.
257 // (This master switch also affects the behavior of -Xprintflags.)
259 // manageable flags are writeable external product flags.
260 // They are dynamically writeable through the JDK management interface
261 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
262 // These flags are external exported interface (see CCC). The list of
263 // manageable flags can be queried programmatically through the management
264 // interface.
265 //
266 // A flag can be made as "manageable" only if
267 // - the flag is defined in a CCC as an external exported interface.
268 // - the VM implementation supports dynamic setting of the flag.
269 // This implies that the VM must *always* query the flag variable
270 // and not reuse state related to the flag state at any given time.
271 // - you want the flag to be queried programmatically by the customers.
272 //
273 // product_rw flags are writeable internal product flags.
274 // They are like "manageable" flags but for internal/private use.
275 // The list of product_rw flags are internal/private flags which
276 // may be changed/removed in a future release. It can be set
277 // through the management interface to get/set value
278 // when the name of flag is supplied.
279 //
280 // A flag can be made as "product_rw" only if
281 // - the VM implementation supports dynamic setting of the flag.
282 // This implies that the VM must *always* query the flag variable
283 // and not reuse state related to the flag state at any given time.
284 //
285 // Note that when there is a need to support develop flags to be writeable,
286 // it can be done in the same way as product_rw.
288 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct, manageable, product_rw, lp64_product) \
289 \
290 lp64_product(bool, UseCompressedOops, false, \
291 "Use 32-bit object references in 64-bit VM. " \
292 "lp64_product means flag is always constant in 32 bit VM") \
293 \
294 lp64_product(bool, CheckCompressedOops, trueInDebug, \
295 "generate checks in encoding/decoding code") \
296 \
297 /* UseMembar is theoretically a temp flag used for memory barrier \
298 * removal testing. It was supposed to be removed before FCS but has \
299 * been re-added (see 6401008) */ \
300 product(bool, UseMembar, false, \
301 "(Unstable) Issues membars on thread state transitions") \
302 \
303 product(bool, PrintCommandLineFlags, false, \
304 "Prints flags that appeared on the command line") \
305 \
306 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
307 "Enable processing of flags relating to field diagnostics") \
308 \
309 product(bool, JavaMonitorsInStackTrace, true, \
310 "Print info. about Java monitor locks when the stacks are dumped")\
311 \
312 product_pd(bool, UseLargePages, \
313 "Use large page memory") \
314 \
315 develop(bool, TracePageSizes, false, \
316 "Trace page size selection and usage.") \
317 \
318 product(bool, UseNUMA, false, \
319 "Use NUMA if available") \
320 \
321 product(intx, NUMAChunkResizeWeight, 20, \
322 "Percentage (0-100) used to weight the current sample when " \
323 "computing exponentially decaying average for " \
324 "AdaptiveNUMAChunkSizing") \
325 \
326 product(intx, NUMASpaceResizeRate, 1*G, \
327 "Do not reallocate more that this amount per collection") \
328 \
329 product(bool, UseAdaptiveNUMAChunkSizing, true, \
330 "Enable adaptive chunk sizing for NUMA") \
331 \
332 product(bool, NUMAStats, false, \
333 "Print NUMA stats in detailed heap information") \
334 \
335 product(intx, NUMAPageScanRate, 256, \
336 "Maximum number of pages to include in the page scan procedure") \
337 \
338 product_pd(bool, NeedsDeoptSuspend, \
339 "True for register window machines (sparc/ia64)") \
340 \
341 product(intx, UseSSE, 99, \
342 "Highest supported SSE instructions set on x86/x64") \
343 \
344 product(uintx, LargePageSizeInBytes, 0, \
345 "Large page size (0 to let VM choose the page size") \
346 \
347 product(uintx, LargePageHeapSizeThreshold, 128*M, \
348 "Use large pages if max heap is at least this big") \
349 \
350 product(bool, ForceTimeHighResolution, false, \
351 "Using high time resolution(For Win32 only)") \
352 \
353 develop(bool, TraceItables, false, \
354 "Trace initialization and use of itables") \
355 \
356 develop(bool, TracePcPatching, false, \
357 "Trace usage of frame::patch_pc") \
358 \
359 develop(bool, TraceJumps, false, \
360 "Trace assembly jumps in thread ring buffer") \
361 \
362 develop(bool, TraceRelocator, false, \
363 "Trace the bytecode relocator") \
364 \
365 develop(bool, TraceLongCompiles, false, \
366 "Print out every time compilation is longer than " \
367 "a given threashold") \
368 \
369 develop(bool, SafepointALot, false, \
370 "Generates a lot of safepoints. Works with " \
371 "GuaranteedSafepointInterval") \
372 \
373 product_pd(bool, BackgroundCompilation, \
374 "A thread requesting compilation is not blocked during " \
375 "compilation") \
376 \
377 product(bool, PrintVMQWaitTime, false, \
378 "Prints out the waiting time in VM operation queue") \
379 \
380 develop(bool, BailoutToInterpreterForThrows, false, \
381 "Compiled methods which throws/catches exceptions will be " \
382 "deopt and intp.") \
383 \
384 develop(bool, NoYieldsInMicrolock, false, \
385 "Disable yields in microlock") \
386 \
387 develop(bool, TraceOopMapGeneration, false, \
388 "Shows oopmap generation") \
389 \
390 product(bool, MethodFlushing, true, \
391 "Reclamation of zombie and not-entrant methods") \
392 \
393 develop(bool, VerifyStack, false, \
394 "Verify stack of each thread when it is entering a runtime call") \
395 \
396 develop(bool, ForceUnreachable, false, \
397 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
398 \
399 notproduct(bool, StressDerivedPointers, false, \
400 "Force scavenge when a derived pointers is detected on stack " \
401 "after rtm call") \
402 \
403 develop(bool, TraceDerivedPointers, false, \
404 "Trace traversal of derived pointers on stack") \
405 \
406 notproduct(bool, TraceCodeBlobStacks, false, \
407 "Trace stack-walk of codeblobs") \
408 \
409 product(bool, PrintJNIResolving, false, \
410 "Used to implement -v:jni") \
411 \
412 notproduct(bool, PrintRewrites, false, \
413 "Print methods that are being rewritten") \
414 \
415 product(bool, UseInlineCaches, true, \
416 "Use Inline Caches for virtual calls ") \
417 \
418 develop(bool, InlineArrayCopy, true, \
419 "inline arraycopy native that is known to be part of " \
420 "base library DLL") \
421 \
422 develop(bool, InlineObjectHash, true, \
423 "inline Object::hashCode() native that is known to be part " \
424 "of base library DLL") \
425 \
426 develop(bool, InlineObjectCopy, true, \
427 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
428 \
429 develop(bool, InlineNatives, true, \
430 "inline natives that are known to be part of base library DLL") \
431 \
432 develop(bool, InlineMathNatives, true, \
433 "inline SinD, CosD, etc.") \
434 \
435 develop(bool, InlineClassNatives, true, \
436 "inline Class.isInstance, etc") \
437 \
438 develop(bool, InlineAtomicLong, true, \
439 "inline sun.misc.AtomicLong") \
440 \
441 develop(bool, InlineThreadNatives, true, \
442 "inline Thread.currentThread, etc") \
443 \
444 develop(bool, InlineReflectionGetCallerClass, true, \
445 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
446 "of base library DLL") \
447 \
448 develop(bool, InlineUnsafeOps, true, \
449 "inline memory ops (native methods) from sun.misc.Unsafe") \
450 \
451 develop(bool, ConvertCmpD2CmpF, true, \
452 "Convert cmpD to cmpF when one input is constant in float range") \
453 \
454 develop(bool, ConvertFloat2IntClipping, true, \
455 "Convert float2int clipping idiom to integer clipping") \
456 \
457 develop(bool, SpecialStringCompareTo, true, \
458 "special version of string compareTo") \
459 \
460 develop(bool, SpecialStringIndexOf, true, \
461 "special version of string indexOf") \
462 \
463 product(bool, SpecialArraysEquals, false, \
464 "special version of Arrays.equals(char[],char[])") \
465 \
466 develop(bool, TraceCallFixup, false, \
467 "traces all call fixups") \
468 \
469 develop(bool, DeoptimizeALot, false, \
470 "deoptimize at every exit from the runtime system") \
471 \
472 develop(ccstrlist, DeoptimizeOnlyAt, "", \
473 "a comma separated list of bcis to deoptimize at") \
474 \
475 product(bool, DeoptimizeRandom, false, \
476 "deoptimize random frames on random exit from the runtime system")\
477 \
478 notproduct(bool, ZombieALot, false, \
479 "creates zombies (non-entrant) at exit from the runt. system") \
480 \
481 notproduct(bool, WalkStackALot, false, \
482 "trace stack (no print) at every exit from the runtime system") \
483 \
484 develop(bool, Debugging, false, \
485 "set when executing debug methods in debug.ccp " \
486 "(to prevent triggering assertions)") \
487 \
488 notproduct(bool, StrictSafepointChecks, trueInDebug, \
489 "Enable strict checks that safepoints cannot happen for threads " \
490 "that used No_Safepoint_Verifier") \
491 \
492 notproduct(bool, VerifyLastFrame, false, \
493 "Verify oops on last frame on entry to VM") \
494 \
495 develop(bool, TraceHandleAllocation, false, \
496 "Prints out warnings when suspicious many handles are allocated") \
497 \
498 product(bool, UseCompilerSafepoints, true, \
499 "Stop at safepoints in compiled code") \
500 \
501 product(bool, UseSplitVerifier, true, \
502 "use split verifier with StackMapTable attributes") \
503 \
504 product(bool, FailOverToOldVerifier, true, \
505 "fail over to old verifier when split verifier fails") \
506 \
507 develop(bool, ShowSafepointMsgs, false, \
508 "Show msg. about safepoint synch.") \
509 \
510 product(bool, SafepointTimeout, false, \
511 "Time out and warn or fail after SafepointTimeoutDelay " \
512 "milliseconds if failed to reach safepoint") \
513 \
514 develop(bool, DieOnSafepointTimeout, false, \
515 "Die upon failure to reach safepoint (see SafepointTimeout)") \
516 \
517 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
518 /* typically, at most a few retries are needed */ \
519 product(intx, SuspendRetryCount, 50, \
520 "Maximum retry count for an external suspend request") \
521 \
522 product(intx, SuspendRetryDelay, 5, \
523 "Milliseconds to delay per retry (* current_retry_count)") \
524 \
525 product(bool, AssertOnSuspendWaitFailure, false, \
526 "Assert/Guarantee on external suspend wait failure") \
527 \
528 product(bool, TraceSuspendWaitFailures, false, \
529 "Trace external suspend wait failures") \
530 \
531 product(bool, MaxFDLimit, true, \
532 "Bump the number of file descriptors to max in solaris.") \
533 \
534 notproduct(bool, LogEvents, trueInDebug, \
535 "Enable Event log") \
536 \
537 product(bool, BytecodeVerificationRemote, true, \
538 "Enables the Java bytecode verifier for remote classes") \
539 \
540 product(bool, BytecodeVerificationLocal, false, \
541 "Enables the Java bytecode verifier for local classes") \
542 \
543 develop(bool, ForceFloatExceptions, trueInDebug, \
544 "Force exceptions on FP stack under/overflow") \
545 \
546 develop(bool, SoftMatchFailure, trueInProduct, \
547 "If the DFA fails to match a node, print a message and bail out") \
548 \
549 develop(bool, VerifyStackAtCalls, false, \
550 "Verify that the stack pointer is unchanged after calls") \
551 \
552 develop(bool, TraceJavaAssertions, false, \
553 "Trace java language assertions") \
554 \
555 notproduct(bool, CheckAssertionStatusDirectives, false, \
556 "temporary - see javaClasses.cpp") \
557 \
558 notproduct(bool, PrintMallocFree, false, \
559 "Trace calls to C heap malloc/free allocation") \
560 \
561 notproduct(bool, PrintOopAddress, false, \
562 "Always print the location of the oop") \
563 \
564 notproduct(bool, VerifyCodeCacheOften, false, \
565 "Verify compiled-code cache often") \
566 \
567 develop(bool, ZapDeadCompiledLocals, false, \
568 "Zap dead locals in compiler frames") \
569 \
570 notproduct(bool, ZapDeadLocalsOld, false, \
571 "Zap dead locals (old version, zaps all frames when " \
572 "entering the VM") \
573 \
574 notproduct(bool, CheckOopishValues, false, \
575 "Warn if value contains oop ( requires ZapDeadLocals)") \
576 \
577 develop(bool, UseMallocOnly, false, \
578 "use only malloc/free for allocation (no resource area/arena)") \
579 \
580 develop(bool, PrintMalloc, false, \
581 "print all malloc/free calls") \
582 \
583 develop(bool, ZapResourceArea, trueInDebug, \
584 "Zap freed resource/arena space with 0xABABABAB") \
585 \
586 notproduct(bool, ZapVMHandleArea, trueInDebug, \
587 "Zap freed VM handle space with 0xBCBCBCBC") \
588 \
589 develop(bool, ZapJNIHandleArea, trueInDebug, \
590 "Zap freed JNI handle space with 0xFEFEFEFE") \
591 \
592 develop(bool, ZapUnusedHeapArea, false, \
593 "Zap unused heap space with 0xBAADBABE") \
594 \
595 develop(bool, PrintVMMessages, true, \
596 "Print vm messages on console") \
597 \
598 product(bool, PrintGCApplicationConcurrentTime, false, \
599 "Print the time the application has been running") \
600 \
601 product(bool, PrintGCApplicationStoppedTime, false, \
602 "Print the time the application has been stopped") \
603 \
604 develop(bool, Verbose, false, \
605 "Prints additional debugging information from other modes") \
606 \
607 develop(bool, PrintMiscellaneous, false, \
608 "Prints uncategorized debugging information (requires +Verbose)") \
609 \
610 develop(bool, WizardMode, false, \
611 "Prints much more debugging information") \
612 \
613 product(bool, ShowMessageBoxOnError, false, \
614 "Keep process alive on VM fatal error") \
615 \
616 product_pd(bool, UseOSErrorReporting, \
617 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
618 \
619 product(bool, SuppressFatalErrorMessage, false, \
620 "Do NO Fatal Error report [Avoid deadlock]") \
621 \
622 product(ccstrlist, OnError, "", \
623 "Run user-defined commands on fatal error; see VMError.cpp " \
624 "for examples") \
625 \
626 product(ccstrlist, OnOutOfMemoryError, "", \
627 "Run user-defined commands on first java.lang.OutOfMemoryError") \
628 \
629 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
630 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
631 \
632 manageable(ccstr, HeapDumpPath, NULL, \
633 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
634 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
635 "in the working directory)") \
636 \
637 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
638 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
639 "when the heap usage is larger than this") \
640 \
641 develop(uintx, HeapDumpSegmentSize, 1*G, \
642 "Approximate segment size when generating a segmented heap dump") \
643 \
644 develop(bool, BreakAtWarning, false, \
645 "Execute breakpoint upon encountering VM warning") \
646 \
647 product_pd(bool, UseVectoredExceptions, \
648 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
649 \
650 develop(bool, TraceVMOperation, false, \
651 "Trace vm operations") \
652 \
653 develop(bool, UseFakeTimers, false, \
654 "Tells whether the VM should use system time or a fake timer") \
655 \
656 diagnostic(bool, LogCompilation, false, \
657 "Log compilation activity in detail to hotspot.log or LogFile") \
658 \
659 product(bool, PrintCompilation, false, \
660 "Print compilations") \
661 \
662 diagnostic(bool, TraceNMethodInstalls, false, \
663 "Trace nmethod intallation") \
664 \
665 diagnostic(bool, TraceOSRBreakpoint, false, \
666 "Trace OSR Breakpoint ") \
667 \
668 diagnostic(bool, TraceCompileTriggered, false, \
669 "Trace compile triggered") \
670 \
671 diagnostic(bool, TraceTriggers, false, \
672 "Trace triggers") \
673 \
674 product(bool, AlwaysRestoreFPU, false, \
675 "Restore the FPU control word after every JNI call (expensive)") \
676 \
677 notproduct(bool, PrintCompilation2, false, \
678 "Print additional statistics per compilation") \
679 \
680 diagnostic(bool, PrintAdapterHandlers, false, \
681 "Print code generated for i2c/c2i adapters") \
682 \
683 diagnostic(bool, PrintAssembly, false, \
684 "Print assembly code (using external disassembler.so)") \
685 \
686 diagnostic(ccstr, PrintAssemblyOptions, false, \
687 "Options string passed to disassembler.so") \
688 \
689 diagnostic(bool, PrintNMethods, false, \
690 "Print assembly code for nmethods when generated") \
691 \
692 diagnostic(bool, PrintNativeNMethods, false, \
693 "Print assembly code for native nmethods when generated") \
694 \
695 develop(bool, PrintDebugInfo, false, \
696 "Print debug information for all nmethods when generated") \
697 \
698 develop(bool, PrintRelocations, false, \
699 "Print relocation information for all nmethods when generated") \
700 \
701 develop(bool, PrintDependencies, false, \
702 "Print dependency information for all nmethods when generated") \
703 \
704 develop(bool, PrintExceptionHandlers, false, \
705 "Print exception handler tables for all nmethods when generated") \
706 \
707 develop(bool, InterceptOSException, false, \
708 "Starts debugger when an implicit OS (e.g., NULL) " \
709 "exception happens") \
710 \
711 notproduct(bool, PrintCodeCache, false, \
712 "Print the compiled_code cache when exiting") \
713 \
714 develop(bool, PrintCodeCache2, false, \
715 "Print detailed info on the compiled_code cache when exiting") \
716 \
717 diagnostic(bool, PrintStubCode, false, \
718 "Print generated stub code") \
719 \
720 product(bool, StackTraceInThrowable, true, \
721 "Collect backtrace in throwable when exception happens") \
722 \
723 product(bool, OmitStackTraceInFastThrow, true, \
724 "Omit backtraces for some 'hot' exceptions in optimized code") \
725 \
726 product(bool, ProfilerPrintByteCodeStatistics, false, \
727 "Prints byte code statictics when dumping profiler output") \
728 \
729 product(bool, ProfilerRecordPC, false, \
730 "Collects tick for each 16 byte interval of compiled code") \
731 \
732 product(bool, ProfileVM, false, \
733 "Profiles ticks that fall within VM (either in the VM Thread " \
734 "or VM code called through stubs)") \
735 \
736 product(bool, ProfileIntervals, false, \
737 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
738 \
739 notproduct(bool, ProfilerCheckIntervals, false, \
740 "Collect and print info on spacing of profiler ticks") \
741 \
742 develop(bool, PrintJVMWarnings, false, \
743 "Prints warnings for unimplemented JVM functions") \
744 \
745 notproduct(uintx, WarnOnStalledSpinLock, 0, \
746 "Prints warnings for stalled SpinLocks") \
747 \
748 develop(bool, InitializeJavaLangSystem, true, \
749 "Initialize java.lang.System - turn off for individual " \
750 "method debugging") \
751 \
752 develop(bool, InitializeJavaLangString, true, \
753 "Initialize java.lang.String - turn off for individual " \
754 "method debugging") \
755 \
756 develop(bool, InitializeJavaLangExceptionsErrors, true, \
757 "Initialize various error and exception classes - turn off for " \
758 "individual method debugging") \
759 \
760 product(bool, RegisterFinalizersAtInit, true, \
761 "Register finalizable objects at end of Object.<init> or " \
762 "after allocation.") \
763 \
764 develop(bool, RegisterReferences, true, \
765 "Tells whether the VM should register soft/weak/final/phantom " \
766 "references") \
767 \
768 develop(bool, IgnoreRewrites, false, \
769 "Supress rewrites of bytecodes in the oopmap generator. " \
770 "This is unsafe!") \
771 \
772 develop(bool, PrintCodeCacheExtension, false, \
773 "Print extension of code cache") \
774 \
775 develop(bool, UsePrivilegedStack, true, \
776 "Enable the security JVM functions") \
777 \
778 develop(bool, IEEEPrecision, true, \
779 "Enables IEEE precision (for INTEL only)") \
780 \
781 develop(bool, ProtectionDomainVerification, true, \
782 "Verifies protection domain before resolution in system " \
783 "dictionary") \
784 \
785 product(bool, ClassUnloading, true, \
786 "Do unloading of classes") \
787 \
788 diagnostic(bool, LinkWellKnownClasses, true, \
789 "Resolve a well known class as soon as its name is seen") \
790 \
791 develop(bool, DisableStartThread, false, \
792 "Disable starting of additional Java threads " \
793 "(for debugging only)") \
794 \
795 develop(bool, MemProfiling, false, \
796 "Write memory usage profiling to log file") \
797 \
798 notproduct(bool, PrintSystemDictionaryAtExit, false, \
799 "Prints the system dictionary at exit") \
800 \
801 diagnostic(bool, UnsyncloadClass, false, \
802 "Unstable: VM calls loadClass unsynchronized. Custom classloader "\
803 "must call VM synchronized for findClass & defineClass") \
804 \
805 product_pd(bool, DontYieldALot, \
806 "Throw away obvious excess yield calls (for SOLARIS only)") \
807 \
808 product_pd(bool, ConvertSleepToYield, \
809 "Converts sleep(0) to thread yield " \
810 "(may be off for SOLARIS to improve GUI)") \
811 \
812 product(bool, ConvertYieldToSleep, false, \
813 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
814 "behavior (SOLARIS only)") \
815 \
816 product(bool, UseBoundThreads, true, \
817 "Bind user level threads to kernel threads (for SOLARIS only)") \
818 \
819 develop(bool, UseDetachedThreads, true, \
820 "Use detached threads that are recycled upon termination " \
821 "(for SOLARIS only)") \
822 \
823 product(bool, UseLWPSynchronization, true, \
824 "Use LWP-based instead of libthread-based synchronization " \
825 "(SPARC only)") \
826 \
827 product(ccstr, SyncKnobs, "", \
828 "(Unstable) Various monitor synchronization tunables") \
829 \
830 product(intx, EmitSync, 0, \
831 "(Unsafe,Unstable) " \
832 " Controls emission of inline sync fast-path code") \
833 \
834 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
835 \
836 product(intx, Atomics, 0, \
837 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
838 \
839 product(intx, FenceInstruction, 0, \
840 "(Unsafe,Unstable) Experimental") \
841 \
842 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
843 \
844 product(intx, SyncVerbose, 0, "(Unstable)" ) \
845 \
846 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
847 \
848 product(intx, hashCode, 0, \
849 "(Unstable) select hashCode generation algorithm" ) \
850 \
851 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
852 "(Unstable, Linux-specific)" \
853 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
854 \
855 product(bool, FilterSpuriousWakeups , true, \
856 "Prevent spurious or premature wakeups from object.wait" \
857 "(Solaris only)") \
858 \
859 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
860 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
861 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
862 \
863 develop(bool, UsePthreads, false, \
864 "Use pthread-based instead of libthread-based synchronization " \
865 "(SPARC only)") \
866 \
867 product(bool, AdjustConcurrency, false, \
868 "call thr_setconcurrency at thread create time to avoid " \
869 "LWP starvation on MP systems (For Solaris Only)") \
870 \
871 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
872 "Should the system attempt to update the compiler file when " \
873 "an error occurs?") \
874 \
875 product(bool, ReduceSignalUsage, false, \
876 "Reduce the use of OS signals in Java and/or the VM") \
877 \
878 notproduct(bool, ValidateMarkSweep, false, \
879 "Do extra validation during MarkSweep collection") \
880 \
881 notproduct(bool, RecordMarkSweepCompaction, false, \
882 "Enable GC-to-GC recording and querying of compaction during " \
883 "MarkSweep") \
884 \
885 develop_pd(bool, ShareVtableStubs, \
886 "Share vtable stubs (smaller code but worse branch prediction") \
887 \
888 develop(bool, LoadLineNumberTables, true, \
889 "Tells whether the class file parser loads line number tables") \
890 \
891 develop(bool, LoadLocalVariableTables, true, \
892 "Tells whether the class file parser loads local variable tables")\
893 \
894 develop(bool, LoadLocalVariableTypeTables, true, \
895 "Tells whether the class file parser loads local variable type tables")\
896 \
897 product(bool, AllowUserSignalHandlers, false, \
898 "Do not complain if the application installs signal handlers " \
899 "(Solaris & Linux only)") \
900 \
901 product(bool, UseSignalChaining, true, \
902 "Use signal-chaining to invoke signal handlers installed " \
903 "by the application (Solaris & Linux only)") \
904 \
905 product(bool, UseAltSigs, false, \
906 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
907 "internal signals. (Solaris only)") \
908 \
909 product(bool, UseSpinning, false, \
910 "Use spinning in monitor inflation and before entry") \
911 \
912 product(bool, PreSpinYield, false, \
913 "Yield before inner spinning loop") \
914 \
915 product(bool, PostSpinYield, true, \
916 "Yield after inner spinning loop") \
917 \
918 product(bool, AllowJNIEnvProxy, false, \
919 "Allow JNIEnv proxies for jdbx") \
920 \
921 product(bool, JNIDetachReleasesMonitors, true, \
922 "JNI DetachCurrentThread releases monitors owned by thread") \
923 \
924 product(bool, RestoreMXCSROnJNICalls, false, \
925 "Restore MXCSR when returning from JNI calls") \
926 \
927 product(bool, CheckJNICalls, false, \
928 "Verify all arguments to JNI calls") \
929 \
930 product(bool, UseFastJNIAccessors, true, \
931 "Use optimized versions of Get<Primitive>Field") \
932 \
933 product(bool, EagerXrunInit, false, \
934 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
935 " but not all -Xrun libraries may support the state of the VM at this time") \
936 \
937 product(bool, PreserveAllAnnotations, false, \
938 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
939 \
940 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
941 "Number of OutOfMemoryErrors preallocated with backtrace") \
942 \
943 product(bool, LazyBootClassLoader, true, \
944 "Enable/disable lazy opening of boot class path entries") \
945 \
946 diagnostic(bool, UseIncDec, true, \
947 "Use INC, DEC instructions on x86") \
948 \
949 product(bool, UseNewLongLShift, false, \
950 "Use optimized bitwise shift left") \
951 \
952 product(bool, UseStoreImmI16, true, \
953 "Use store immediate 16-bits value instruction on x86") \
954 \
955 product(bool, UseAddressNop, false, \
956 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
957 \
958 product(bool, UseXmmLoadAndClearUpper, true, \
959 "Load low part of XMM register and clear upper part") \
960 \
961 product(bool, UseXmmRegToRegMoveAll, false, \
962 "Copy all XMM register bits when moving value between registers") \
963 \
964 product(bool, UseXmmI2D, false, \
965 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
966 \
967 product(bool, UseXmmI2F, false, \
968 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
969 \
970 product(intx, FieldsAllocationStyle, 1, \
971 "0 - type based with oops first, 1 - with oops last") \
972 \
973 product(bool, CompactFields, true, \
974 "Allocate nonstatic fields in gaps between previous fields") \
975 \
976 notproduct(bool, PrintCompactFieldsSavings, false, \
977 "Print how many words were saved with CompactFields") \
978 \
979 product(bool, UseBiasedLocking, true, \
980 "Enable biased locking in JVM") \
981 \
982 product(intx, BiasedLockingStartupDelay, 4000, \
983 "Number of milliseconds to wait before enabling biased locking") \
984 \
985 diagnostic(bool, PrintBiasedLockingStatistics, false, \
986 "Print statistics of biased locking in JVM") \
987 \
988 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
989 "Threshold of number of revocations per type to try to " \
990 "rebias all objects in the heap of that type") \
991 \
992 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
993 "Threshold of number of revocations per type to permanently " \
994 "revoke biases of all objects in the heap of that type") \
995 \
996 product(intx, BiasedLockingDecayTime, 25000, \
997 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
998 "type after previous bulk rebias") \
999 \
1000 /* tracing */ \
1001 \
1002 notproduct(bool, TraceRuntimeCalls, false, \
1003 "Trace run-time calls") \
1004 \
1005 develop(bool, TraceJNICalls, false, \
1006 "Trace JNI calls") \
1007 \
1008 notproduct(bool, TraceJVMCalls, false, \
1009 "Trace JVM calls") \
1010 \
1011 product(ccstr, TraceJVMTI, "", \
1012 "Trace flags for JVMTI functions and events") \
1013 \
1014 /* This option can change an EMCP method into an obsolete method. */ \
1015 /* This can affect tests that except specific methods to be EMCP. */ \
1016 /* This option should be used with caution. */ \
1017 product(bool, StressLdcRewrite, false, \
1018 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1019 \
1020 product(intx, TraceRedefineClasses, 0, \
1021 "Trace level for JVMTI RedefineClasses") \
1022 \
1023 /* change to false by default sometime after Mustang */ \
1024 product(bool, VerifyMergedCPBytecodes, true, \
1025 "Verify bytecodes after RedefineClasses constant pool merging") \
1026 \
1027 develop(bool, TraceJNIHandleAllocation, false, \
1028 "Trace allocation/deallocation of JNI handle blocks") \
1029 \
1030 develop(bool, TraceThreadEvents, false, \
1031 "Trace all thread events") \
1032 \
1033 develop(bool, TraceBytecodes, false, \
1034 "Trace bytecode execution") \
1035 \
1036 develop(bool, TraceClassInitialization, false, \
1037 "Trace class initialization") \
1038 \
1039 develop(bool, TraceExceptions, false, \
1040 "Trace exceptions") \
1041 \
1042 develop(bool, TraceICs, false, \
1043 "Trace inline cache changes") \
1044 \
1045 notproduct(bool, TraceInvocationCounterOverflow, false, \
1046 "Trace method invocation counter overflow") \
1047 \
1048 develop(bool, TraceInlineCacheClearing, false, \
1049 "Trace clearing of inline caches in nmethods") \
1050 \
1051 develop(bool, TraceDependencies, false, \
1052 "Trace dependencies") \
1053 \
1054 develop(bool, VerifyDependencies, trueInDebug, \
1055 "Exercise and verify the compilation dependency mechanism") \
1056 \
1057 develop(bool, TraceNewOopMapGeneration, false, \
1058 "Trace OopMapGeneration") \
1059 \
1060 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1061 "Trace OopMapGeneration: print detailed cell states") \
1062 \
1063 develop(bool, TimeOopMap, false, \
1064 "Time calls to GenerateOopMap::compute_map() in sum") \
1065 \
1066 develop(bool, TimeOopMap2, false, \
1067 "Time calls to GenerateOopMap::compute_map() individually") \
1068 \
1069 develop(bool, TraceMonitorMismatch, false, \
1070 "Trace monitor matching failures during OopMapGeneration") \
1071 \
1072 develop(bool, TraceOopMapRewrites, false, \
1073 "Trace rewritting of method oops during oop map generation") \
1074 \
1075 develop(bool, TraceSafepoint, false, \
1076 "Trace safepoint operations") \
1077 \
1078 develop(bool, TraceICBuffer, false, \
1079 "Trace usage of IC buffer") \
1080 \
1081 develop(bool, TraceCompiledIC, false, \
1082 "Trace changes of compiled IC") \
1083 \
1084 notproduct(bool, TraceZapDeadLocals, false, \
1085 "Trace zapping dead locals") \
1086 \
1087 develop(bool, TraceStartupTime, false, \
1088 "Trace setup time") \
1089 \
1090 develop(bool, TraceHPI, false, \
1091 "Trace Host Porting Interface (HPI)") \
1092 \
1093 product(ccstr, HPILibPath, NULL, \
1094 "Specify alternate path to HPI library") \
1095 \
1096 develop(bool, TraceProtectionDomainVerification, false, \
1097 "Trace protection domain verifcation") \
1098 \
1099 develop(bool, TraceClearedExceptions, false, \
1100 "Prints when an exception is forcibly cleared") \
1101 \
1102 product(bool, TraceClassResolution, false, \
1103 "Trace all constant pool resolutions (for debugging)") \
1104 \
1105 product(bool, TraceBiasedLocking, false, \
1106 "Trace biased locking in JVM") \
1107 \
1108 product(bool, TraceMonitorInflation, false, \
1109 "Trace monitor inflation in JVM") \
1110 \
1111 /* assembler */ \
1112 product(bool, Use486InstrsOnly, false, \
1113 "Use 80486 Compliant instruction subset") \
1114 \
1115 /* gc */ \
1116 \
1117 product(bool, UseSerialGC, false, \
1118 "Tells whether the VM should use serial garbage collector") \
1119 \
1120 product(bool, UseParallelGC, false, \
1121 "Use the Parallel Scavenge garbage collector") \
1122 \
1123 product(bool, UseParallelOldGC, false, \
1124 "Use the Parallel Old garbage collector") \
1125 \
1126 product(bool, UseParallelOldGCCompacting, true, \
1127 "In the Parallel Old garbage collector use parallel compaction") \
1128 \
1129 product(bool, UseParallelDensePrefixUpdate, true, \
1130 "In the Parallel Old garbage collector use parallel dense" \
1131 " prefix update") \
1132 \
1133 develop(bool, UseParallelOldGCChunkPointerCalc, true, \
1134 "In the Parallel Old garbage collector use chucks to calculate" \
1135 " new object locations") \
1136 \
1137 product(uintx, HeapMaximumCompactionInterval, 20, \
1138 "How often should we maximally compact the heap (not allowing " \
1139 "any dead space)") \
1140 \
1141 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1142 "The collection count for the first maximum compaction") \
1143 \
1144 product(bool, UseMaximumCompactionOnSystemGC, true, \
1145 "In the Parallel Old garbage collector maximum compaction for " \
1146 "a system GC") \
1147 \
1148 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1149 "The mean used by the par compact dead wood" \
1150 "limiter (a number between 0-100).") \
1151 \
1152 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1153 "The standard deviation used by the par compact dead wood" \
1154 "limiter (a number between 0-100).") \
1155 \
1156 product(bool, UseParallelOldGCDensePrefix, true, \
1157 "Use a dense prefix with the Parallel Old garbage collector") \
1158 \
1159 product(uintx, ParallelGCThreads, 0, \
1160 "Number of parallel threads parallel gc will use") \
1161 \
1162 product(uintx, ParallelCMSThreads, 0, \
1163 "Max number of threads CMS will use for concurrent work") \
1164 \
1165 develop(bool, VerifyParallelOldWithMarkSweep, false, \
1166 "Use the MarkSweep code to verify phases of Parallel Old") \
1167 \
1168 develop(uintx, VerifyParallelOldWithMarkSweepInterval, 1, \
1169 "Interval at which the MarkSweep code is used to verify " \
1170 "phases of Parallel Old") \
1171 \
1172 develop(bool, ParallelOldMTUnsafeMarkBitMap, false, \
1173 "Use the Parallel Old MT unsafe in marking the bitmap") \
1174 \
1175 develop(bool, ParallelOldMTUnsafeUpdateLiveData, false, \
1176 "Use the Parallel Old MT unsafe in update of live size") \
1177 \
1178 develop(bool, TraceChunkTasksQueuing, false, \
1179 "Trace the queuing of the chunk tasks") \
1180 \
1181 product(uintx, YoungPLABSize, 4096, \
1182 "Size of young gen promotion labs (in HeapWords)") \
1183 \
1184 product(uintx, OldPLABSize, 1024, \
1185 "Size of old gen promotion labs (in HeapWords)") \
1186 \
1187 product(uintx, GCTaskTimeStampEntries, 200, \
1188 "Number of time stamp entries per gc worker thread") \
1189 \
1190 product(bool, AlwaysTenure, false, \
1191 "Always tenure objects in eden. (ParallelGC only)") \
1192 \
1193 product(bool, NeverTenure, false, \
1194 "Never tenure objects in eden, May tenure on overflow" \
1195 " (ParallelGC only)") \
1196 \
1197 product(bool, ScavengeBeforeFullGC, true, \
1198 "Scavenge youngest generation before each full GC," \
1199 " used with UseParallelGC") \
1200 \
1201 develop(bool, ScavengeWithObjectsInToSpace, false, \
1202 "Allow scavenges to occur when to_space contains objects.") \
1203 \
1204 product(bool, UseConcMarkSweepGC, false, \
1205 "Use Concurrent Mark-Sweep GC in the old generation") \
1206 \
1207 product(bool, ExplicitGCInvokesConcurrent, false, \
1208 "A System.gc() request invokes a concurrent collection;" \
1209 " (effective only when UseConcMarkSweepGC)") \
1210 \
1211 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1212 "A System.gc() request invokes a concurrent collection and" \
1213 " also unloads classes during such a concurrent gc cycle " \
1214 " (effective only when UseConcMarkSweepGC)") \
1215 \
1216 develop(bool, UseCMSAdaptiveFreeLists, true, \
1217 "Use Adaptive Free Lists in the CMS generation") \
1218 \
1219 develop(bool, UseAsyncConcMarkSweepGC, true, \
1220 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1221 \
1222 develop(bool, RotateCMSCollectionTypes, false, \
1223 "Rotate the CMS collections among concurrent and STW") \
1224 \
1225 product(bool, UseCMSBestFit, true, \
1226 "Use CMS best fit allocation strategy") \
1227 \
1228 product(bool, UseCMSCollectionPassing, true, \
1229 "Use passing of collection from background to foreground") \
1230 \
1231 product(bool, UseParNewGC, false, \
1232 "Use parallel threads in the new generation.") \
1233 \
1234 product(bool, ParallelGCVerbose, false, \
1235 "Verbose output for parallel GC.") \
1236 \
1237 product(intx, ParallelGCBufferWastePct, 10, \
1238 "wasted fraction of parallel allocation buffer.") \
1239 \
1240 product(bool, ParallelGCRetainPLAB, true, \
1241 "Retain parallel allocation buffers across scavenges.") \
1242 \
1243 product(intx, TargetPLABWastePct, 10, \
1244 "target wasted space in last buffer as pct of overall allocation")\
1245 \
1246 product(uintx, PLABWeight, 75, \
1247 "Percentage (0-100) used to weight the current sample when" \
1248 "computing exponentially decaying average for ResizePLAB.") \
1249 \
1250 product(bool, ResizePLAB, true, \
1251 "Dynamically resize (survivor space) promotion labs") \
1252 \
1253 product(bool, PrintPLAB, false, \
1254 "Print (survivor space) promotion labs sizing decisions") \
1255 \
1256 product(intx, ParGCArrayScanChunk, 50, \
1257 "Scan a subset and push remainder, if array is bigger than this") \
1258 \
1259 product(intx, ParGCDesiredObjsFromOverflowList, 20, \
1260 "The desired number of objects to claim from the overflow list") \
1261 \
1262 product(uintx, CMSParPromoteBlocksToClaim, 50, \
1263 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1264 "parallel GC.") \
1265 \
1266 product(bool, AlwaysPreTouch, false, \
1267 "It forces all freshly committed pages to be pre-touched.") \
1268 \
1269 product(bool, CMSUseOldDefaults, false, \
1270 "A flag temporarily introduced to allow reverting to some older" \
1271 "default settings; older as of 6.0 ") \
1272 \
1273 product(intx, CMSYoungGenPerWorker, 16*M, \
1274 "The amount of young gen chosen by default per GC worker " \
1275 "thread available ") \
1276 \
1277 product(bool, CMSIncrementalMode, false, \
1278 "Whether CMS GC should operate in \"incremental\" mode") \
1279 \
1280 product(uintx, CMSIncrementalDutyCycle, 10, \
1281 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1282 "CMSIncrementalPacing is enabled, then this is just the initial" \
1283 "value") \
1284 \
1285 product(bool, CMSIncrementalPacing, true, \
1286 "Whether the CMS incremental mode duty cycle should be " \
1287 "automatically adjusted") \
1288 \
1289 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1290 "Lower bound on the duty cycle when CMSIncrementalPacing is" \
1291 "enabled (a percentage, 0-100).") \
1292 \
1293 product(uintx, CMSIncrementalSafetyFactor, 10, \
1294 "Percentage (0-100) used to add conservatism when computing the" \
1295 "duty cycle.") \
1296 \
1297 product(uintx, CMSIncrementalOffset, 0, \
1298 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1299 "is shifted to the right within the period between young GCs") \
1300 \
1301 product(uintx, CMSExpAvgFactor, 25, \
1302 "Percentage (0-100) used to weight the current sample when" \
1303 "computing exponential averages for CMS statistics.") \
1304 \
1305 product(uintx, CMS_FLSWeight, 50, \
1306 "Percentage (0-100) used to weight the current sample when" \
1307 "computing exponentially decating averages for CMS FLS statistics.") \
1308 \
1309 product(uintx, CMS_FLSPadding, 2, \
1310 "The multiple of deviation from mean to use for buffering" \
1311 "against volatility in free list demand.") \
1312 \
1313 product(uintx, FLSCoalescePolicy, 2, \
1314 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1315 \
1316 product(uintx, CMS_SweepWeight, 50, \
1317 "Percentage (0-100) used to weight the current sample when" \
1318 "computing exponentially decaying average for inter-sweep duration.") \
1319 \
1320 product(uintx, CMS_SweepPadding, 2, \
1321 "The multiple of deviation from mean to use for buffering" \
1322 "against volatility in inter-sweep duration.") \
1323 \
1324 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1325 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1326 " duration exceeds this threhold in milliseconds") \
1327 \
1328 develop(bool, CMSTraceIncrementalMode, false, \
1329 "Trace CMS incremental mode") \
1330 \
1331 develop(bool, CMSTraceIncrementalPacing, false, \
1332 "Trace CMS incremental mode pacing computation") \
1333 \
1334 develop(bool, CMSTraceThreadState, false, \
1335 "Trace the CMS thread state (enable the trace_state() method)") \
1336 \
1337 product(bool, CMSClassUnloadingEnabled, false, \
1338 "Whether class unloading enabled when using CMS GC") \
1339 \
1340 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1341 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1342 " for which classes may not be unloaded") \
1343 \
1344 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1345 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1346 \
1347 product(bool, UseCMSCompactAtFullCollection, true, \
1348 "Use mark sweep compact at full collections") \
1349 \
1350 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1351 "Number of CMS full collection done before compaction if > 0") \
1352 \
1353 develop(intx, CMSDictionaryChoice, 0, \
1354 "Use BinaryTreeDictionary as default in the CMS generation") \
1355 \
1356 product(uintx, CMSIndexedFreeListReplenish, 4, \
1357 "Replenish and indexed free list with this number of chunks") \
1358 \
1359 product(bool, CMSLoopWarn, false, \
1360 "Warn in case of excessive CMS looping") \
1361 \
1362 develop(bool, CMSOverflowEarlyRestoration, false, \
1363 "Whether preserved marks should be restored early") \
1364 \
1365 product(uintx, CMSMarkStackSize, 32*K, \
1366 "Size of CMS marking stack") \
1367 \
1368 product(uintx, CMSMarkStackSizeMax, 4*M, \
1369 "Max size of CMS marking stack") \
1370 \
1371 notproduct(bool, CMSMarkStackOverflowALot, false, \
1372 "Whether we should simulate frequent marking stack / work queue" \
1373 " overflow") \
1374 \
1375 notproduct(intx, CMSMarkStackOverflowInterval, 1000, \
1376 "A per-thread `interval' counter that determines how frequently" \
1377 " we simulate overflow; a smaller number increases frequency") \
1378 \
1379 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1380 "(Temporary, subject to experimentation)" \
1381 "Maximum number of abortable preclean iterations, if > 0") \
1382 \
1383 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1384 "(Temporary, subject to experimentation)" \
1385 "Maximum time in abortable preclean in ms") \
1386 \
1387 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1388 "(Temporary, subject to experimentation)" \
1389 "Nominal minimum work per abortable preclean iteration") \
1390 \
1391 product(intx, CMSAbortablePrecleanWaitMillis, 100, \
1392 "(Temporary, subject to experimentation)" \
1393 " Time that we sleep between iterations when not given" \
1394 " enough work per iteration") \
1395 \
1396 product(uintx, CMSRescanMultiple, 32, \
1397 "Size (in cards) of CMS parallel rescan task") \
1398 \
1399 product(uintx, CMSConcMarkMultiple, 32, \
1400 "Size (in cards) of CMS concurrent MT marking task") \
1401 \
1402 product(uintx, CMSRevisitStackSize, 1*M, \
1403 "Size of CMS KlassKlass revisit stack") \
1404 \
1405 product(bool, CMSAbortSemantics, false, \
1406 "Whether abort-on-overflow semantics is implemented") \
1407 \
1408 product(bool, CMSParallelRemarkEnabled, true, \
1409 "Whether parallel remark enabled (only if ParNewGC)") \
1410 \
1411 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1412 "Whether parallel remark of survivor space" \
1413 " enabled (effective only if CMSParallelRemarkEnabled)") \
1414 \
1415 product(bool, CMSPLABRecordAlways, true, \
1416 "Whether to always record survivor space PLAB bdries" \
1417 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1418 \
1419 product(bool, CMSConcurrentMTEnabled, true, \
1420 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1421 \
1422 product(bool, CMSPermGenPrecleaningEnabled, true, \
1423 "Whether concurrent precleaning enabled in perm gen" \
1424 " (effective only when CMSPrecleaningEnabled is true)") \
1425 \
1426 product(bool, CMSPrecleaningEnabled, true, \
1427 "Whether concurrent precleaning enabled") \
1428 \
1429 product(uintx, CMSPrecleanIter, 3, \
1430 "Maximum number of precleaning iteration passes") \
1431 \
1432 product(uintx, CMSPrecleanNumerator, 2, \
1433 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1434 " ratio") \
1435 \
1436 product(uintx, CMSPrecleanDenominator, 3, \
1437 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1438 " ratio") \
1439 \
1440 product(bool, CMSPrecleanRefLists1, true, \
1441 "Preclean ref lists during (initial) preclean phase") \
1442 \
1443 product(bool, CMSPrecleanRefLists2, false, \
1444 "Preclean ref lists during abortable preclean phase") \
1445 \
1446 product(bool, CMSPrecleanSurvivors1, false, \
1447 "Preclean survivors during (initial) preclean phase") \
1448 \
1449 product(bool, CMSPrecleanSurvivors2, true, \
1450 "Preclean survivors during abortable preclean phase") \
1451 \
1452 product(uintx, CMSPrecleanThreshold, 1000, \
1453 "Don't re-iterate if #dirty cards less than this") \
1454 \
1455 product(bool, CMSCleanOnEnter, true, \
1456 "Clean-on-enter optimization for reducing number of dirty cards") \
1457 \
1458 product(uintx, CMSRemarkVerifyVariant, 1, \
1459 "Choose variant (1,2) of verification following remark") \
1460 \
1461 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1462 "If Eden used is below this value, don't try to schedule remark") \
1463 \
1464 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1465 "The Eden occupancy % at which to try and schedule remark pause") \
1466 \
1467 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1468 "Start sampling Eden top at least before yg occupancy reaches" \
1469 " 1/<ratio> of the size at which we plan to schedule remark") \
1470 \
1471 product(uintx, CMSSamplingGrain, 16*K, \
1472 "The minimum distance between eden samples for CMS (see above)") \
1473 \
1474 product(bool, CMSScavengeBeforeRemark, false, \
1475 "Attempt scavenge before the CMS remark step") \
1476 \
1477 develop(bool, CMSTraceSweeper, false, \
1478 "Trace some actions of the CMS sweeper") \
1479 \
1480 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1481 "Don't drain below this size per parallel worker/thief") \
1482 \
1483 product(intx, CMSWaitDuration, 2000, \
1484 "Time in milliseconds that CMS thread waits for young GC") \
1485 \
1486 product(bool, CMSYield, true, \
1487 "Yield between steps of concurrent mark & sweep") \
1488 \
1489 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1490 "Bitmap operations should process at most this many bits" \
1491 "between yields") \
1492 \
1493 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1494 "Verify that all refs across the FLS boundary " \
1495 " are to valid objects") \
1496 \
1497 diagnostic(bool, FLSVerifyLists, false, \
1498 "Do lots of (expensive) FreeListSpace verification") \
1499 \
1500 diagnostic(bool, FLSVerifyIndexTable, false, \
1501 "Do lots of (expensive) FLS index table verification") \
1502 \
1503 develop(bool, FLSVerifyDictionary, false, \
1504 "Do lots of (expensive) FLS dictionary verification") \
1505 \
1506 develop(bool, VerifyBlockOffsetArray, false, \
1507 "Do (expensive!) block offset array verification") \
1508 \
1509 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \
1510 "Maintain _unallocated_block in BlockOffsetArray" \
1511 " (currently applicable only to CMS collector)") \
1512 \
1513 develop(bool, TraceCMSState, false, \
1514 "Trace the state of the CMS collection") \
1515 \
1516 product(intx, RefDiscoveryPolicy, 0, \
1517 "Whether reference-based(0) or referent-based(1)") \
1518 \
1519 product(bool, ParallelRefProcEnabled, false, \
1520 "Enable parallel reference processing whenever possible") \
1521 \
1522 product(bool, ParallelRefProcBalancingEnabled, true, \
1523 "Enable balancing of reference processing queues") \
1524 \
1525 product(intx, CMSTriggerRatio, 80, \
1526 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1527 " allocated before a CMS collection cycle commences") \
1528 \
1529 product(intx, CMSTriggerPermRatio, 80, \
1530 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \
1531 " is allocated before a CMS collection cycle commences, that " \
1532 " also collects the perm generation") \
1533 \
1534 product(uintx, CMSBootstrapOccupancy, 50, \
1535 "Percentage CMS generation occupancy at which to " \
1536 " initiate CMS collection for bootstrapping collection stats") \
1537 \
1538 product(intx, CMSInitiatingOccupancyFraction, -1, \
1539 "Percentage CMS generation occupancy to start a CMS collection " \
1540 " cycle (A negative value means that CMSTriggerRatio is used)") \
1541 \
1542 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1543 "Percentage CMS perm generation occupancy to start a CMScollection"\
1544 " cycle (A negative value means that CMSTriggerPermRatio is used)")\
1545 \
1546 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1547 "Only use occupancy as a crierion for starting a CMS collection") \
1548 \
1549 product(intx, CMSIsTooFullPercentage, 98, \
1550 "An absolute ceiling above which CMS will always consider the" \
1551 " perm gen ripe for collection") \
1552 \
1553 develop(bool, CMSTestInFreeList, false, \
1554 "Check if the coalesced range is already in the " \
1555 "free lists as claimed.") \
1556 \
1557 notproduct(bool, CMSVerifyReturnedBytes, false, \
1558 "Check that all the garbage collected was returned to the " \
1559 "free lists.") \
1560 \
1561 notproduct(bool, ScavengeALot, false, \
1562 "Force scavenge at every Nth exit from the runtime system " \
1563 "(N=ScavengeALotInterval)") \
1564 \
1565 develop(bool, FullGCALot, false, \
1566 "Force full gc at every Nth exit from the runtime system " \
1567 "(N=FullGCALotInterval)") \
1568 \
1569 notproduct(bool, GCALotAtAllSafepoints, false, \
1570 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1571 \
1572 product(bool, HandlePromotionFailure, true, \
1573 "The youngest generation collection does not require" \
1574 " a guarantee of full promotion of all live objects.") \
1575 \
1576 notproduct(bool, PromotionFailureALot, false, \
1577 "Use promotion failure handling on every youngest generation " \
1578 "collection") \
1579 \
1580 develop(uintx, PromotionFailureALotCount, 1000, \
1581 "Number of promotion failures occurring at ParGCAllocBuffer" \
1582 "refill attempts (ParNew) or promotion attempts " \
1583 "(other young collectors) ") \
1584 \
1585 develop(uintx, PromotionFailureALotInterval, 5, \
1586 "Total collections between promotion failures alot") \
1587 \
1588 develop(intx, WorkStealingSleepMillis, 1, \
1589 "Sleep time when sleep is used for yields") \
1590 \
1591 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1592 "Number of yields before a sleep is done during workstealing") \
1593 \
1594 product(uintx, PreserveMarkStackSize, 40, \
1595 "Size for stack used in promotion failure handling") \
1596 \
1597 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1598 \
1599 product_pd(bool, ResizeTLAB, \
1600 "Dynamically resize tlab size for threads") \
1601 \
1602 product(bool, ZeroTLAB, false, \
1603 "Zero out the newly created TLAB") \
1604 \
1605 product(bool, PrintTLAB, false, \
1606 "Print various TLAB related information") \
1607 \
1608 product(bool, TLABStats, true, \
1609 "Print various TLAB related information") \
1610 \
1611 product_pd(bool, NeverActAsServerClassMachine, \
1612 "Never act like a server-class machine") \
1613 \
1614 product(bool, AlwaysActAsServerClassMachine, false, \
1615 "Always act like a server-class machine") \
1616 \
1617 product_pd(uintx, DefaultMaxRAM, \
1618 "Maximum real memory size for setting server class heap size") \
1619 \
1620 product(uintx, DefaultMaxRAMFraction, 4, \
1621 "Fraction (1/n) of real memory used for server class max heap") \
1622 \
1623 product(uintx, DefaultInitialRAMFraction, 64, \
1624 "Fraction (1/n) of real memory used for server class initial heap") \
1625 \
1626 product(bool, UseAutoGCSelectPolicy, false, \
1627 "Use automatic collection selection policy") \
1628 \
1629 product(uintx, AutoGCSelectPauseMillis, 5000, \
1630 "Automatic GC selection pause threshhold in ms") \
1631 \
1632 product(bool, UseAdaptiveSizePolicy, true, \
1633 "Use adaptive generation sizing policies") \
1634 \
1635 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1636 "Use adaptive survivor sizing policies") \
1637 \
1638 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1639 "Use adaptive young-old sizing policies at minor collections") \
1640 \
1641 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1642 "Use adaptive young-old sizing policies at major collections") \
1643 \
1644 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1645 "Use statistics from System.GC for adaptive size policy") \
1646 \
1647 product(bool, UseAdaptiveGCBoundary, false, \
1648 "Allow young-old boundary to move") \
1649 \
1650 develop(bool, TraceAdaptiveGCBoundary, false, \
1651 "Trace young-old boundary moves") \
1652 \
1653 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
1654 "Resize the virtual spaces of the young or old generations") \
1655 \
1656 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
1657 "Policy for changeing generation size for throughput goals") \
1658 \
1659 product(uintx, AdaptiveSizePausePolicy, 0, \
1660 "Policy for changing generation size for pause goals") \
1661 \
1662 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
1663 "Adjust tenured generation to achive a minor pause goal") \
1664 \
1665 develop(bool, PSAdjustYoungGenForMajorPause, false, \
1666 "Adjust young generation to achive a major pause goal") \
1667 \
1668 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
1669 "Number of steps where heuristics is used before data is used") \
1670 \
1671 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
1672 "Number of collections before the adaptive sizing is started") \
1673 \
1674 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
1675 "Collecton interval for printing information, zero => never") \
1676 \
1677 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
1678 "Use adaptive minimum footprint as a goal") \
1679 \
1680 product(uintx, AdaptiveSizePolicyWeight, 10, \
1681 "Weight given to exponential resizing, between 0 and 100") \
1682 \
1683 product(uintx, AdaptiveTimeWeight, 25, \
1684 "Weight given to time in adaptive policy, between 0 and 100") \
1685 \
1686 product(uintx, PausePadding, 1, \
1687 "How much buffer to keep for pause time") \
1688 \
1689 product(uintx, PromotedPadding, 3, \
1690 "How much buffer to keep for promotion failure") \
1691 \
1692 product(uintx, SurvivorPadding, 3, \
1693 "How much buffer to keep for survivor overflow") \
1694 \
1695 product(uintx, AdaptivePermSizeWeight, 20, \
1696 "Weight for perm gen exponential resizing, between 0 and 100") \
1697 \
1698 product(uintx, PermGenPadding, 3, \
1699 "How much buffer to keep for perm gen sizing") \
1700 \
1701 product(uintx, ThresholdTolerance, 10, \
1702 "Allowed collection cost difference between generations") \
1703 \
1704 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
1705 "If collection costs are within margin, reduce both by full delta") \
1706 \
1707 product(uintx, YoungGenerationSizeIncrement, 20, \
1708 "Adaptive size percentage change in young generation") \
1709 \
1710 product(uintx, YoungGenerationSizeSupplement, 80, \
1711 "Supplement to YoungedGenerationSizeIncrement used at startup") \
1712 \
1713 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
1714 "Decay factor to YoungedGenerationSizeSupplement") \
1715 \
1716 product(uintx, TenuredGenerationSizeIncrement, 20, \
1717 "Adaptive size percentage change in tenured generation") \
1718 \
1719 product(uintx, TenuredGenerationSizeSupplement, 80, \
1720 "Supplement to TenuredGenerationSizeIncrement used at startup") \
1721 \
1722 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
1723 "Decay factor to TenuredGenerationSizeIncrement") \
1724 \
1725 product(uintx, MaxGCPauseMillis, max_uintx, \
1726 "Adaptive size policy maximum GC pause time goal in msec") \
1727 \
1728 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
1729 "Adaptive size policy maximum GC minor pause time goal in msec") \
1730 \
1731 product(uintx, GCTimeRatio, 99, \
1732 "Adaptive size policy application time to GC time ratio") \
1733 \
1734 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
1735 "Adaptive size scale down factor for shrinking") \
1736 \
1737 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
1738 "Adaptive size decays the major cost for long major intervals") \
1739 \
1740 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
1741 "Time scale over which major costs decay") \
1742 \
1743 product(uintx, MinSurvivorRatio, 3, \
1744 "Minimum ratio of young generation/survivor space size") \
1745 \
1746 product(uintx, InitialSurvivorRatio, 8, \
1747 "Initial ratio of eden/survivor space size") \
1748 \
1749 product(uintx, BaseFootPrintEstimate, 256*M, \
1750 "Estimate of footprint other than Java Heap") \
1751 \
1752 product(bool, UseGCOverheadLimit, true, \
1753 "Use policy to limit of proportion of time spent in GC " \
1754 "before an OutOfMemory error is thrown") \
1755 \
1756 product(uintx, GCTimeLimit, 98, \
1757 "Limit of proportion of time spent in GC before an OutOfMemory" \
1758 "error is thrown (used with GCHeapFreeLimit)") \
1759 \
1760 product(uintx, GCHeapFreeLimit, 2, \
1761 "Minimum percentage of free space after a full GC before an " \
1762 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
1763 \
1764 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
1765 "Number of consecutive collections before gc time limit fires") \
1766 \
1767 product(bool, PrintAdaptiveSizePolicy, false, \
1768 "Print information about AdaptiveSizePolicy") \
1769 \
1770 product(intx, PrefetchCopyIntervalInBytes, -1, \
1771 "How far ahead to prefetch destination area (<= 0 means off)") \
1772 \
1773 product(intx, PrefetchScanIntervalInBytes, -1, \
1774 "How far ahead to prefetch scan area (<= 0 means off)") \
1775 \
1776 product(intx, PrefetchFieldsAhead, -1, \
1777 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
1778 \
1779 develop(bool, UsePrefetchQueue, true, \
1780 "Use the prefetch queue during PS promotion") \
1781 \
1782 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
1783 "Verify system before exiting") \
1784 \
1785 diagnostic(bool, VerifyBeforeGC, false, \
1786 "Verify memory system before GC") \
1787 \
1788 diagnostic(bool, VerifyAfterGC, false, \
1789 "Verify memory system after GC") \
1790 \
1791 diagnostic(bool, VerifyDuringGC, false, \
1792 "Verify memory system during GC (between phases)") \
1793 \
1794 diagnostic(bool, VerifyRememberedSets, false, \
1795 "Verify GC remembered sets") \
1796 \
1797 diagnostic(bool, VerifyObjectStartArray, true, \
1798 "Verify GC object start array if verify before/after") \
1799 \
1800 product(bool, DisableExplicitGC, false, \
1801 "Tells whether calling System.gc() does a full GC") \
1802 \
1803 notproduct(bool, CheckMemoryInitialization, false, \
1804 "Checks memory initialization") \
1805 \
1806 product(bool, CollectGen0First, false, \
1807 "Collect youngest generation before each full GC") \
1808 \
1809 diagnostic(bool, BindCMSThreadToCPU, false, \
1810 "Bind CMS Thread to CPU if possible") \
1811 \
1812 diagnostic(uintx, CPUForCMSThread, 0, \
1813 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
1814 \
1815 product(bool, BindGCTaskThreadsToCPUs, false, \
1816 "Bind GCTaskThreads to CPUs if possible") \
1817 \
1818 product(bool, UseGCTaskAffinity, false, \
1819 "Use worker affinity when asking for GCTasks") \
1820 \
1821 product(uintx, ProcessDistributionStride, 4, \
1822 "Stride through processors when distributing processes") \
1823 \
1824 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
1825 "number of times the coordinator GC thread will sleep while " \
1826 "yielding before giving up and resuming GC") \
1827 \
1828 product(uintx, CMSYieldSleepCount, 0, \
1829 "number of times a GC thread (minus the coordinator) " \
1830 "will sleep while yielding before giving up and resuming GC") \
1831 \
1832 notproduct(bool, PrintFlagsFinal, false, \
1833 "Print all command line flags after argument processing") \
1834 \
1835 /* gc tracing */ \
1836 manageable(bool, PrintGC, false, \
1837 "Print message at garbage collect") \
1838 \
1839 manageable(bool, PrintGCDetails, false, \
1840 "Print more details at garbage collect") \
1841 \
1842 manageable(bool, PrintGCDateStamps, false, \
1843 "Print date stamps at garbage collect") \
1844 \
1845 manageable(bool, PrintGCTimeStamps, false, \
1846 "Print timestamps at garbage collect") \
1847 \
1848 product(bool, PrintGCTaskTimeStamps, false, \
1849 "Print timestamps for individual gc worker thread tasks") \
1850 \
1851 develop(intx, ConcGCYieldTimeout, 0, \
1852 "If non-zero, assert that GC threads yield within this # of ms.") \
1853 \
1854 notproduct(bool, TraceMarkSweep, false, \
1855 "Trace mark sweep") \
1856 \
1857 product(bool, PrintReferenceGC, false, \
1858 "Print times spent handling reference objects during GC " \
1859 " (enabled only when PrintGCDetails)") \
1860 \
1861 develop(bool, TraceReferenceGC, false, \
1862 "Trace handling of soft/weak/final/phantom references") \
1863 \
1864 develop(bool, TraceFinalizerRegistration, false, \
1865 "Trace registration of final references") \
1866 \
1867 notproduct(bool, TraceScavenge, false, \
1868 "Trace scavenge") \
1869 \
1870 product_rw(bool, TraceClassLoading, false, \
1871 "Trace all classes loaded") \
1872 \
1873 product(bool, TraceClassLoadingPreorder, false, \
1874 "Trace all classes loaded in order referenced (not loaded)") \
1875 \
1876 product_rw(bool, TraceClassUnloading, false, \
1877 "Trace unloading of classes") \
1878 \
1879 product_rw(bool, TraceLoaderConstraints, false, \
1880 "Trace loader constraints") \
1881 \
1882 product(bool, TraceGen0Time, false, \
1883 "Trace accumulated time for Gen 0 collection") \
1884 \
1885 product(bool, TraceGen1Time, false, \
1886 "Trace accumulated time for Gen 1 collection") \
1887 \
1888 product(bool, PrintTenuringDistribution, false, \
1889 "Print tenuring age information") \
1890 \
1891 product_rw(bool, PrintHeapAtGC, false, \
1892 "Print heap layout before and after each GC") \
1893 \
1894 product(bool, PrintHeapAtSIGBREAK, true, \
1895 "Print heap layout in response to SIGBREAK") \
1896 \
1897 manageable(bool, PrintClassHistogram, false, \
1898 "Print a histogram of class instances") \
1899 \
1900 develop(bool, TraceWorkGang, false, \
1901 "Trace activities of work gangs") \
1902 \
1903 product(bool, TraceParallelOldGCTasks, false, \
1904 "Trace multithreaded GC activity") \
1905 \
1906 develop(bool, TraceBlockOffsetTable, false, \
1907 "Print BlockOffsetTable maps") \
1908 \
1909 develop(bool, TraceCardTableModRefBS, false, \
1910 "Print CardTableModRefBS maps") \
1911 \
1912 develop(bool, TraceGCTaskManager, false, \
1913 "Trace actions of the GC task manager") \
1914 \
1915 develop(bool, TraceGCTaskQueue, false, \
1916 "Trace actions of the GC task queues") \
1917 \
1918 develop(bool, TraceGCTaskThread, false, \
1919 "Trace actions of the GC task threads") \
1920 \
1921 product(bool, PrintParallelOldGCPhaseTimes, false, \
1922 "Print the time taken by each parallel old gc phase." \
1923 "PrintGCDetails must also be enabled.") \
1924 \
1925 develop(bool, TraceParallelOldGCMarkingPhase, false, \
1926 "Trace parallel old gc marking phase") \
1927 \
1928 develop(bool, TraceParallelOldGCSummaryPhase, false, \
1929 "Trace parallel old gc summary phase") \
1930 \
1931 develop(bool, TraceParallelOldGCCompactionPhase, false, \
1932 "Trace parallel old gc compaction phase") \
1933 \
1934 develop(bool, TraceParallelOldGCDensePrefix, false, \
1935 "Trace parallel old gc dense prefix computation") \
1936 \
1937 develop(bool, IgnoreLibthreadGPFault, false, \
1938 "Suppress workaround for libthread GP fault") \
1939 \
1940 product(bool, PrintJNIGCStalls, false, \
1941 "Print diagnostic message when GC is stalled" \
1942 "by JNI critical section") \
1943 \
1944 /* JVMTI heap profiling */ \
1945 \
1946 diagnostic(bool, TraceJVMTIObjectTagging, false, \
1947 "Trace JVMTI object tagging calls") \
1948 \
1949 diagnostic(bool, VerifyBeforeIteration, false, \
1950 "Verify memory system before JVMTI iteration") \
1951 \
1952 /* compiler interface */ \
1953 \
1954 develop(bool, CIPrintCompilerName, false, \
1955 "when CIPrint is active, print the name of the active compiler") \
1956 \
1957 develop(bool, CIPrintCompileQueue, false, \
1958 "display the contents of the compile queue whenever a " \
1959 "compilation is enqueued") \
1960 \
1961 develop(bool, CIPrintRequests, false, \
1962 "display every request for compilation") \
1963 \
1964 product(bool, CITime, false, \
1965 "collect timing information for compilation") \
1966 \
1967 develop(bool, CITimeEach, false, \
1968 "display timing information after each successful compilation") \
1969 \
1970 develop(bool, CICountOSR, true, \
1971 "use a separate counter when assigning ids to osr compilations") \
1972 \
1973 develop(bool, CICompileNatives, true, \
1974 "compile native methods if supported by the compiler") \
1975 \
1976 develop_pd(bool, CICompileOSR, \
1977 "compile on stack replacement methods if supported by the " \
1978 "compiler") \
1979 \
1980 develop(bool, CIPrintMethodCodes, false, \
1981 "print method bytecodes of the compiled code") \
1982 \
1983 develop(bool, CIPrintTypeFlow, false, \
1984 "print the results of ciTypeFlow analysis") \
1985 \
1986 develop(bool, CITraceTypeFlow, false, \
1987 "detailed per-bytecode tracing of ciTypeFlow analysis") \
1988 \
1989 develop(intx, CICloneLoopTestLimit, 100, \
1990 "size limit for blocks heuristically cloned in ciTypeFlow") \
1991 \
1992 /* temp diagnostics */ \
1993 \
1994 diagnostic(bool, TraceRedundantCompiles, false, \
1995 "Have compile broker print when a request already in the queue is"\
1996 " requested again") \
1997 \
1998 diagnostic(bool, InitialCompileFast, false, \
1999 "Initial compile at CompLevel_fast_compile") \
2000 \
2001 diagnostic(bool, InitialCompileReallyFast, false, \
2002 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2003 \
2004 diagnostic(bool, FullProfileOnReInterpret, true, \
2005 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2006 \
2007 /* compiler */ \
2008 \
2009 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2010 "Number of compiler threads to run") \
2011 \
2012 product(intx, CompilationPolicyChoice, 0, \
2013 "which compilation policy (0/1)") \
2014 \
2015 develop(bool, UseStackBanging, true, \
2016 "use stack banging for stack overflow checks (required for " \
2017 "proper StackOverflow handling; disable only to measure cost " \
2018 "of stackbanging)") \
2019 \
2020 develop(bool, Use24BitFPMode, true, \
2021 "Set 24-bit FPU mode on a per-compile basis ") \
2022 \
2023 develop(bool, Use24BitFP, true, \
2024 "use FP instructions that produce 24-bit precise results") \
2025 \
2026 develop(bool, UseStrictFP, true, \
2027 "use strict fp if modifier strictfp is set") \
2028 \
2029 develop(bool, GenerateSynchronizationCode, true, \
2030 "generate locking/unlocking code for synchronized methods and " \
2031 "monitors") \
2032 \
2033 develop(bool, GenerateCompilerNullChecks, true, \
2034 "Generate explicit null checks for loads/stores/calls") \
2035 \
2036 develop(bool, GenerateRangeChecks, true, \
2037 "Generate range checks for array accesses") \
2038 \
2039 develop_pd(bool, ImplicitNullChecks, \
2040 "generate code for implicit null checks") \
2041 \
2042 product(bool, PrintSafepointStatistics, false, \
2043 "print statistics about safepoint synchronization") \
2044 \
2045 product(intx, PrintSafepointStatisticsCount, 300, \
2046 "total number of safepoint statistics collected " \
2047 "before printing them out") \
2048 \
2049 product(intx, PrintSafepointStatisticsTimeout, -1, \
2050 "print safepoint statistics only when safepoint takes" \
2051 " more than PrintSafepointSatisticsTimeout in millis") \
2052 \
2053 develop(bool, InlineAccessors, true, \
2054 "inline accessor methods (get/set)") \
2055 \
2056 product(bool, Inline, true, \
2057 "enable inlining") \
2058 \
2059 product(bool, ClipInlining, true, \
2060 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2061 \
2062 develop(bool, UseCHA, true, \
2063 "enable CHA") \
2064 \
2065 product(bool, UseTypeProfile, true, \
2066 "Check interpreter profile for historically monomorphic calls") \
2067 \
2068 product(intx, TypeProfileMajorReceiverPercent, 90, \
2069 "% of major receiver type to all profiled receivers") \
2070 \
2071 notproduct(bool, TimeCompiler, false, \
2072 "time the compiler") \
2073 \
2074 notproduct(bool, TimeCompiler2, false, \
2075 "detailed time the compiler (requires +TimeCompiler)") \
2076 \
2077 diagnostic(bool, PrintInlining, false, \
2078 "prints inlining optimizations") \
2079 \
2080 diagnostic(bool, PrintIntrinsics, false, \
2081 "prints attempted and successful inlining of intrinsics") \
2082 \
2083 diagnostic(ccstrlist, DisableIntrinsic, "", \
2084 "do not expand intrinsics whose (internal) names appear here") \
2085 \
2086 develop(bool, StressReflectiveCode, false, \
2087 "Use inexact types at allocations, etc., to test reflection") \
2088 \
2089 develop(bool, EagerInitialization, false, \
2090 "Eagerly initialize classes if possible") \
2091 \
2092 product(bool, Tier1UpdateMethodData, trueInTiered, \
2093 "Update methodDataOops in Tier1-generated code") \
2094 \
2095 develop(bool, TraceMethodReplacement, false, \
2096 "Print when methods are replaced do to recompilation") \
2097 \
2098 develop(bool, PrintMethodFlushing, false, \
2099 "print the nmethods being flushed") \
2100 \
2101 notproduct(bool, LogMultipleMutexLocking, false, \
2102 "log locking and unlocking of mutexes (only if multiple locks " \
2103 "are held)") \
2104 \
2105 develop(bool, UseRelocIndex, false, \
2106 "use an index to speed random access to relocations") \
2107 \
2108 develop(bool, StressCodeBuffers, false, \
2109 "Exercise code buffer expansion and other rare state changes") \
2110 \
2111 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2112 "Generate extra debugging info for non-safepoints in nmethods") \
2113 \
2114 diagnostic(bool, DebugInlinedCalls, true, \
2115 "If false, restricts profiled locations to the root method only") \
2116 \
2117 product(bool, PrintVMOptions, trueInDebug, \
2118 "print VM flag settings") \
2119 \
2120 diagnostic(bool, SerializeVMOutput, true, \
2121 "Use a mutex to serialize output to tty and hotspot.log") \
2122 \
2123 diagnostic(bool, DisplayVMOutput, true, \
2124 "Display all VM output on the tty, independently of LogVMOutput") \
2125 \
2126 diagnostic(bool, LogVMOutput, trueInDebug, \
2127 "Save VM output to hotspot.log, or to LogFile") \
2128 \
2129 diagnostic(ccstr, LogFile, NULL, \
2130 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2131 \
2132 product(ccstr, ErrorFile, NULL, \
2133 "If an error occurs, save the error data to this file " \
2134 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2135 \
2136 product(bool, DisplayVMOutputToStderr, false, \
2137 "If DisplayVMOutput is true, display all VM output to stderr") \
2138 \
2139 product(bool, DisplayVMOutputToStdout, false, \
2140 "If DisplayVMOutput is true, display all VM output to stdout") \
2141 \
2142 product(bool, UseHeavyMonitors, false, \
2143 "use heavyweight instead of lightweight Java monitors") \
2144 \
2145 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2146 "print histogram of the symbol table") \
2147 \
2148 notproduct(bool, ExitVMOnVerifyError, false, \
2149 "standard exit from VM if bytecode verify error " \
2150 "(only in debug mode)") \
2151 \
2152 notproduct(ccstr, AbortVMOnException, NULL, \
2153 "Call fatal if this exception is thrown. Example: " \
2154 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2155 \
2156 develop(bool, DebugVtables, false, \
2157 "add debugging code to vtable dispatch") \
2158 \
2159 develop(bool, PrintVtables, false, \
2160 "print vtables when printing klass") \
2161 \
2162 notproduct(bool, PrintVtableStats, false, \
2163 "print vtables stats at end of run") \
2164 \
2165 develop(bool, TraceCreateZombies, false, \
2166 "trace creation of zombie nmethods") \
2167 \
2168 notproduct(bool, IgnoreLockingAssertions, false, \
2169 "disable locking assertions (for speed)") \
2170 \
2171 notproduct(bool, VerifyLoopOptimizations, false, \
2172 "verify major loop optimizations") \
2173 \
2174 product(bool, RangeCheckElimination, true, \
2175 "Split loop iterations to eliminate range checks") \
2176 \
2177 develop_pd(bool, UncommonNullCast, \
2178 "track occurrences of null in casts; adjust compiler tactics") \
2179 \
2180 develop(bool, TypeProfileCasts, true, \
2181 "treat casts like calls for purposes of type profiling") \
2182 \
2183 develop(bool, MonomorphicArrayCheck, true, \
2184 "Uncommon-trap array store checks that require full type check") \
2185 \
2186 develop(bool, DelayCompilationDuringStartup, true, \
2187 "Delay invoking the compiler until main application class is " \
2188 "loaded") \
2189 \
2190 develop(bool, CompileTheWorld, false, \
2191 "Compile all methods in all classes in bootstrap class path " \
2192 "(stress test)") \
2193 \
2194 develop(bool, CompileTheWorldPreloadClasses, true, \
2195 "Preload all classes used by a class before start loading") \
2196 \
2197 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2198 "Compile all methods although class initializer failed") \
2199 \
2200 develop(bool, TraceIterativeGVN, false, \
2201 "Print progress during Iterative Global Value Numbering") \
2202 \
2203 develop(bool, FillDelaySlots, true, \
2204 "Fill delay slots (on SPARC only)") \
2205 \
2206 develop(bool, VerifyIterativeGVN, false, \
2207 "Verify Def-Use modifications during sparse Iterative Global " \
2208 "Value Numbering") \
2209 \
2210 notproduct(bool, TracePhaseCCP, false, \
2211 "Print progress during Conditional Constant Propagation") \
2212 \
2213 develop(bool, TimeLivenessAnalysis, false, \
2214 "Time computation of bytecode liveness analysis") \
2215 \
2216 develop(bool, TraceLivenessGen, false, \
2217 "Trace the generation of liveness analysis information") \
2218 \
2219 notproduct(bool, TraceLivenessQuery, false, \
2220 "Trace queries of liveness analysis information") \
2221 \
2222 notproduct(bool, CollectIndexSetStatistics, false, \
2223 "Collect information about IndexSets") \
2224 \
2225 develop(bool, PrintDominators, false, \
2226 "Print out dominator trees for GVN") \
2227 \
2228 develop(bool, UseLoopSafepoints, true, \
2229 "Generate Safepoint nodes in every loop") \
2230 \
2231 notproduct(bool, TraceCISCSpill, false, \
2232 "Trace allocators use of cisc spillable instructions") \
2233 \
2234 notproduct(bool, TraceSpilling, false, \
2235 "Trace spilling") \
2236 \
2237 develop(bool, DeutschShiffmanExceptions, true, \
2238 "Fast check to find exception handler for precisely typed " \
2239 "exceptions") \
2240 \
2241 product(bool, SplitIfBlocks, true, \
2242 "Clone compares and control flow through merge points to fold " \
2243 "some branches") \
2244 \
2245 develop(intx, FastAllocateSizeLimit, 128*K, \
2246 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2247 "Inline allocations larger than this in doublewords must go slow")\
2248 \
2249 product(bool, AggressiveOpts, false, \
2250 "Enable aggressive optimizations - see arguments.cpp") \
2251 \
2252 product(bool, UseStringCache, false, \
2253 "Enable String cache capabilities on String.java") \
2254 \
2255 /* statistics */ \
2256 develop(bool, UseVTune, false, \
2257 "enable support for Intel's VTune profiler") \
2258 \
2259 develop(bool, CountCompiledCalls, false, \
2260 "counts method invocations") \
2261 \
2262 notproduct(bool, CountRuntimeCalls, false, \
2263 "counts VM runtime calls") \
2264 \
2265 develop(bool, CountJNICalls, false, \
2266 "counts jni method invocations") \
2267 \
2268 notproduct(bool, CountJVMCalls, false, \
2269 "counts jvm method invocations") \
2270 \
2271 notproduct(bool, CountRemovableExceptions, false, \
2272 "count exceptions that could be replaced by branches due to " \
2273 "inlining") \
2274 \
2275 notproduct(bool, ICMissHistogram, false, \
2276 "produce histogram of IC misses") \
2277 \
2278 notproduct(bool, PrintClassStatistics, false, \
2279 "prints class statistics at end of run") \
2280 \
2281 notproduct(bool, PrintMethodStatistics, false, \
2282 "prints method statistics at end of run") \
2283 \
2284 /* interpreter */ \
2285 develop(bool, ClearInterpreterLocals, false, \
2286 "Always clear local variables of interpreter activations upon " \
2287 "entry") \
2288 \
2289 product_pd(bool, RewriteBytecodes, \
2290 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2291 \
2292 product_pd(bool, RewriteFrequentPairs, \
2293 "Rewrite frequently used bytecode pairs into a single bytecode") \
2294 \
2295 diagnostic(bool, PrintInterpreter, false, \
2296 "Prints the generated interpreter code") \
2297 \
2298 product(bool, UseInterpreter, true, \
2299 "Use interpreter for non-compiled methods") \
2300 \
2301 develop(bool, UseFastSignatureHandlers, true, \
2302 "Use fast signature handlers for native calls") \
2303 \
2304 develop(bool, UseV8InstrsOnly, false, \
2305 "Use SPARC-V8 Compliant instruction subset") \
2306 \
2307 product(bool, UseNiagaraInstrs, false, \
2308 "Use Niagara-efficient instruction subset") \
2309 \
2310 develop(bool, UseCASForSwap, false, \
2311 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2312 \
2313 product(bool, UseLoopCounter, true, \
2314 "Increment invocation counter on backward branch") \
2315 \
2316 product(bool, UseFastEmptyMethods, true, \
2317 "Use fast method entry code for empty methods") \
2318 \
2319 product(bool, UseFastAccessorMethods, true, \
2320 "Use fast method entry code for accessor methods") \
2321 \
2322 product_pd(bool, UseOnStackReplacement, \
2323 "Use on stack replacement, calls runtime if invoc. counter " \
2324 "overflows in loop") \
2325 \
2326 notproduct(bool, TraceOnStackReplacement, false, \
2327 "Trace on stack replacement") \
2328 \
2329 develop(bool, PoisonOSREntry, true, \
2330 "Detect abnormal calls to OSR code") \
2331 \
2332 product_pd(bool, PreferInterpreterNativeStubs, \
2333 "Use always interpreter stubs for native methods invoked via " \
2334 "interpreter") \
2335 \
2336 develop(bool, CountBytecodes, false, \
2337 "Count number of bytecodes executed") \
2338 \
2339 develop(bool, PrintBytecodeHistogram, false, \
2340 "Print histogram of the executed bytecodes") \
2341 \
2342 develop(bool, PrintBytecodePairHistogram, false, \
2343 "Print histogram of the executed bytecode pairs") \
2344 \
2345 diagnostic(bool, PrintSignatureHandlers, false, \
2346 "Print code generated for native method signature handlers") \
2347 \
2348 develop(bool, VerifyOops, false, \
2349 "Do plausibility checks for oops") \
2350 \
2351 develop(bool, CheckUnhandledOops, false, \
2352 "Check for unhandled oops in VM code") \
2353 \
2354 develop(bool, VerifyJNIFields, trueInDebug, \
2355 "Verify jfieldIDs for instance fields") \
2356 \
2357 notproduct(bool, VerifyJNIEnvThread, false, \
2358 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2359 "from JNI") \
2360 \
2361 develop(bool, VerifyFPU, false, \
2362 "Verify FPU state (check for NaN's, etc.)") \
2363 \
2364 develop(bool, VerifyThread, false, \
2365 "Watch the thread register for corruption (SPARC only)") \
2366 \
2367 develop(bool, VerifyActivationFrameSize, false, \
2368 "Verify that activation frame didn't become smaller than its " \
2369 "minimal size") \
2370 \
2371 develop(bool, TraceFrequencyInlining, false, \
2372 "Trace frequency based inlining") \
2373 \
2374 notproduct(bool, TraceTypeProfile, false, \
2375 "Trace type profile") \
2376 \
2377 develop_pd(bool, InlineIntrinsics, \
2378 "Inline intrinsics that can be statically resolved") \
2379 \
2380 product_pd(bool, ProfileInterpreter, \
2381 "Profile at the bytecode level during interpretation") \
2382 \
2383 develop_pd(bool, ProfileTraps, \
2384 "Profile deoptimization traps at the bytecode level") \
2385 \
2386 product(intx, ProfileMaturityPercentage, 20, \
2387 "number of method invocations/branches (expressed as % of " \
2388 "CompileThreshold) before using the method's profile") \
2389 \
2390 develop(bool, PrintMethodData, false, \
2391 "Print the results of +ProfileInterpreter at end of run") \
2392 \
2393 develop(bool, VerifyDataPointer, trueInDebug, \
2394 "Verify the method data pointer during interpreter profiling") \
2395 \
2396 develop(bool, VerifyCompiledCode, false, \
2397 "Include miscellaneous runtime verifications in nmethod code; " \
2398 "off by default because it disturbs nmethod size heuristics.") \
2399 \
2400 \
2401 /* compilation */ \
2402 product(bool, UseCompiler, true, \
2403 "use compilation") \
2404 \
2405 develop(bool, TraceCompilationPolicy, false, \
2406 "Trace compilation policy") \
2407 \
2408 develop(bool, TimeCompilationPolicy, false, \
2409 "Time the compilation policy") \
2410 \
2411 product(bool, UseCounterDecay, true, \
2412 "adjust recompilation counters") \
2413 \
2414 develop(intx, CounterHalfLifeTime, 30, \
2415 "half-life time of invocation counters (in secs)") \
2416 \
2417 develop(intx, CounterDecayMinIntervalLength, 500, \
2418 "Min. ms. between invocation of CounterDecay") \
2419 \
2420 product(bool, AlwaysCompileLoopMethods, false, \
2421 "when using recompilation, never interpret methods " \
2422 "containing loops") \
2423 \
2424 product(bool, DontCompileHugeMethods, true, \
2425 "don't compile methods > HugeMethodLimit") \
2426 \
2427 /* Bytecode escape analysis estimation. */ \
2428 product(bool, EstimateArgEscape, true, \
2429 "Analyze bytecodes to estimate escape state of arguments") \
2430 \
2431 product(intx, BCEATraceLevel, 0, \
2432 "How much tracing to do of bytecode escape analysis estimates") \
2433 \
2434 product(intx, MaxBCEAEstimateLevel, 5, \
2435 "Maximum number of nested calls that are analyzed by BC EA.") \
2436 \
2437 product(intx, MaxBCEAEstimateSize, 150, \
2438 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2439 \
2440 product(intx, AllocatePrefetchStyle, 1, \
2441 "0 = no prefetch, " \
2442 "1 = prefetch instructions for each allocation, " \
2443 "2 = use TLAB watermark to gate allocation prefetch") \
2444 \
2445 product(intx, AllocatePrefetchDistance, -1, \
2446 "Distance to prefetch ahead of allocation pointer") \
2447 \
2448 product(intx, AllocatePrefetchLines, 1, \
2449 "Number of lines to prefetch ahead of allocation pointer") \
2450 \
2451 product(intx, AllocatePrefetchStepSize, 16, \
2452 "Step size in bytes of sequential prefetch instructions") \
2453 \
2454 product(intx, AllocatePrefetchInstr, 0, \
2455 "Prefetch instruction to prefetch ahead of allocation pointer") \
2456 \
2457 product(intx, ReadPrefetchInstr, 0, \
2458 "Prefetch instruction to prefetch ahead") \
2459 \
2460 /* deoptimization */ \
2461 develop(bool, TraceDeoptimization, false, \
2462 "Trace deoptimization") \
2463 \
2464 develop(bool, DebugDeoptimization, false, \
2465 "Tracing various information while debugging deoptimization") \
2466 \
2467 product(intx, SelfDestructTimer, 0, \
2468 "Will cause VM to terminate after a given time (in minutes) " \
2469 "(0 means off)") \
2470 \
2471 product(intx, MaxJavaStackTraceDepth, 1024, \
2472 "Max. no. of lines in the stack trace for Java exceptions " \
2473 "(0 means all)") \
2474 \
2475 develop(intx, GuaranteedSafepointInterval, 1000, \
2476 "Guarantee a safepoint (at least) every so many milliseconds " \
2477 "(0 means none)") \
2478 \
2479 product(intx, SafepointTimeoutDelay, 10000, \
2480 "Delay in milliseconds for option SafepointTimeout") \
2481 \
2482 product(intx, NmethodSweepFraction, 4, \
2483 "Number of invocations of sweeper to cover all nmethods") \
2484 \
2485 notproduct(intx, MemProfilingInterval, 500, \
2486 "Time between each invocation of the MemProfiler") \
2487 \
2488 develop(intx, MallocCatchPtr, -1, \
2489 "Hit breakpoint when mallocing/freeing this pointer") \
2490 \
2491 notproduct(intx, AssertRepeat, 1, \
2492 "number of times to evaluate expression in assert " \
2493 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2494 \
2495 notproduct(ccstrlist, SuppressErrorAt, "", \
2496 "List of assertions (file:line) to muzzle") \
2497 \
2498 notproduct(uintx, HandleAllocationLimit, 1024, \
2499 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2500 "is used") \
2501 \
2502 develop(uintx, TotalHandleAllocationLimit, 1024, \
2503 "Threshold for total handle allocation when " \
2504 "+TraceHandleAllocation is used") \
2505 \
2506 develop(intx, StackPrintLimit, 100, \
2507 "number of stack frames to print in VM-level stack dump") \
2508 \
2509 notproduct(intx, MaxElementPrintSize, 256, \
2510 "maximum number of elements to print") \
2511 \
2512 notproduct(intx, MaxSubklassPrintSize, 4, \
2513 "maximum number of subklasses to print when printing klass") \
2514 \
2515 develop(intx, MaxInlineLevel, 9, \
2516 "maximum number of nested calls that are inlined") \
2517 \
2518 develop(intx, MaxRecursiveInlineLevel, 1, \
2519 "maximum number of nested recursive calls that are inlined") \
2520 \
2521 develop(intx, InlineSmallCode, 1000, \
2522 "Only inline already compiled methods if their code size is " \
2523 "less than this") \
2524 \
2525 product(intx, MaxInlineSize, 35, \
2526 "maximum bytecode size of a method to be inlined") \
2527 \
2528 product_pd(intx, FreqInlineSize, \
2529 "maximum bytecode size of a frequent method to be inlined") \
2530 \
2531 develop(intx, MaxTrivialSize, 6, \
2532 "maximum bytecode size of a trivial method to be inlined") \
2533 \
2534 develop(intx, MinInliningThreshold, 250, \
2535 "min. invocation count a method needs to have to be inlined") \
2536 \
2537 develop(intx, AlignEntryCode, 4, \
2538 "aligns entry code to specified value (in bytes)") \
2539 \
2540 develop(intx, MethodHistogramCutoff, 100, \
2541 "cutoff value for method invoc. histogram (+CountCalls)") \
2542 \
2543 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2544 "# of interpreted methods to show in profile") \
2545 \
2546 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2547 "# of compiled methods to show in profile") \
2548 \
2549 develop(intx, ProfilerNumberOfStubMethods, 25, \
2550 "# of stub methods to show in profile") \
2551 \
2552 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2553 "# of runtime stub nodes to show in profile") \
2554 \
2555 product(intx, ProfileIntervalsTicks, 100, \
2556 "# of ticks between printing of interval profile " \
2557 "(+ProfileIntervals)") \
2558 \
2559 notproduct(intx, ScavengeALotInterval, 1, \
2560 "Interval between which scavenge will occur with +ScavengeALot") \
2561 \
2562 notproduct(intx, FullGCALotInterval, 1, \
2563 "Interval between which full gc will occur with +FullGCALot") \
2564 \
2565 notproduct(intx, FullGCALotStart, 0, \
2566 "For which invocation to start FullGCAlot") \
2567 \
2568 notproduct(intx, FullGCALotDummies, 32*K, \
2569 "Dummy object allocated with +FullGCALot, forcing all objects " \
2570 "to move") \
2571 \
2572 develop(intx, DontYieldALotInterval, 10, \
2573 "Interval between which yields will be dropped (milliseconds)") \
2574 \
2575 develop(intx, MinSleepInterval, 1, \
2576 "Minimum sleep() interval (milliseconds) when " \
2577 "ConvertSleepToYield is off (used for SOLARIS)") \
2578 \
2579 product(intx, EventLogLength, 2000, \
2580 "maximum nof events in event log") \
2581 \
2582 develop(intx, ProfilerPCTickThreshold, 15, \
2583 "Number of ticks in a PC buckets to be a hotspot") \
2584 \
2585 notproduct(intx, DeoptimizeALotInterval, 5, \
2586 "Number of exits until DeoptimizeALot kicks in") \
2587 \
2588 notproduct(intx, ZombieALotInterval, 5, \
2589 "Number of exits until ZombieALot kicks in") \
2590 \
2591 develop(bool, StressNonEntrant, false, \
2592 "Mark nmethods non-entrant at registration") \
2593 \
2594 diagnostic(intx, MallocVerifyInterval, 0, \
2595 "if non-zero, verify C heap after every N calls to " \
2596 "malloc/realloc/free") \
2597 \
2598 diagnostic(intx, MallocVerifyStart, 0, \
2599 "if non-zero, start verifying C heap after Nth call to " \
2600 "malloc/realloc/free") \
2601 \
2602 product(intx, TypeProfileWidth, 2, \
2603 "number of receiver types to record in call/cast profile") \
2604 \
2605 develop(intx, BciProfileWidth, 2, \
2606 "number of return bci's to record in ret profile") \
2607 \
2608 product(intx, PerMethodRecompilationCutoff, 400, \
2609 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2610 \
2611 product(intx, PerBytecodeRecompilationCutoff, 100, \
2612 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2613 \
2614 product(intx, PerMethodTrapLimit, 100, \
2615 "Limit on traps (of one kind) in a method (includes inlines)") \
2616 \
2617 product(intx, PerBytecodeTrapLimit, 4, \
2618 "Limit on traps (of one kind) at a particular BCI") \
2619 \
2620 develop(intx, FreqCountInvocations, 1, \
2621 "Scaling factor for branch frequencies (deprecated)") \
2622 \
2623 develop(intx, InlineFrequencyRatio, 20, \
2624 "Ratio of call site execution to caller method invocation") \
2625 \
2626 develop_pd(intx, InlineFrequencyCount, \
2627 "Count of call site execution necessary to trigger frequent " \
2628 "inlining") \
2629 \
2630 develop(intx, InlineThrowCount, 50, \
2631 "Force inlining of interpreted methods that throw this often") \
2632 \
2633 develop(intx, InlineThrowMaxSize, 200, \
2634 "Force inlining of throwing methods smaller than this") \
2635 \
2636 product(intx, AliasLevel, 3, \
2637 "0 for no aliasing, 1 for oop/field/static/array split, " \
2638 "2 for class split, 3 for unique instances") \
2639 \
2640 develop(bool, VerifyAliases, false, \
2641 "perform extra checks on the results of alias analysis") \
2642 \
2643 develop(intx, ProfilerNodeSize, 1024, \
2644 "Size in K to allocate for the Profile Nodes of each thread") \
2645 \
2646 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
2647 "Number of times to spin wait on a v8 atomic operation lock") \
2648 \
2649 product(intx, ReadSpinIterations, 100, \
2650 "Number of read attempts before a yield (spin inner loop)") \
2651 \
2652 product_pd(intx, PreInflateSpin, \
2653 "Number of times to spin wait before inflation") \
2654 \
2655 product(intx, PreBlockSpin, 10, \
2656 "Number of times to spin in an inflated lock before going to " \
2657 "an OS lock") \
2658 \
2659 /* gc parameters */ \
2660 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \
2661 "Default maximum size for object heap (in bytes)") \
2662 \
2663 product_pd(uintx, NewSize, \
2664 "Default size of new generation (in bytes)") \
2665 \
2666 product(uintx, MaxNewSize, max_uintx, \
2667 "Maximum size of new generation (in bytes)") \
2668 \
2669 product(uintx, PretenureSizeThreshold, 0, \
2670 "Max size in bytes of objects allocated in DefNew generation") \
2671 \
2672 product_pd(uintx, TLABSize, \
2673 "Default (or starting) size of TLAB (in bytes)") \
2674 \
2675 product(uintx, MinTLABSize, 2*K, \
2676 "Minimum allowed TLAB size (in bytes)") \
2677 \
2678 product(uintx, TLABAllocationWeight, 35, \
2679 "Allocation averaging weight") \
2680 \
2681 product(uintx, TLABWasteTargetPercent, 1, \
2682 "Percentage of Eden that can be wasted") \
2683 \
2684 product(uintx, TLABRefillWasteFraction, 64, \
2685 "Max TLAB waste at a refill (internal fragmentation)") \
2686 \
2687 product(uintx, TLABWasteIncrement, 4, \
2688 "Increment allowed waste at slow allocation") \
2689 \
2690 product_pd(intx, SurvivorRatio, \
2691 "Ratio of eden/survivor space size") \
2692 \
2693 product_pd(intx, NewRatio, \
2694 "Ratio of new/old generation sizes") \
2695 \
2696 product(uintx, MaxLiveObjectEvacuationRatio, 100, \
2697 "Max percent of eden objects that will be live at scavenge") \
2698 \
2699 product_pd(uintx, NewSizeThreadIncrease, \
2700 "Additional size added to desired new generation size per " \
2701 "non-daemon thread (in bytes)") \
2702 \
2703 product(uintx, OldSize, ScaleForWordSize(4096*K), \
2704 "Default size of tenured generation (in bytes)") \
2705 \
2706 product_pd(uintx, PermSize, \
2707 "Default size of permanent generation (in bytes)") \
2708 \
2709 product_pd(uintx, MaxPermSize, \
2710 "Maximum size of permanent generation (in bytes)") \
2711 \
2712 product(uintx, MinHeapFreeRatio, 40, \
2713 "Min percentage of heap free after GC to avoid expansion") \
2714 \
2715 product(uintx, MaxHeapFreeRatio, 70, \
2716 "Max percentage of heap free after GC to avoid shrinking") \
2717 \
2718 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
2719 "Number of milliseconds per MB of free space in the heap") \
2720 \
2721 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
2722 "Min change in heap space due to GC (in bytes)") \
2723 \
2724 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
2725 "Min expansion of permanent heap (in bytes)") \
2726 \
2727 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
2728 "Max expansion of permanent heap without full GC (in bytes)") \
2729 \
2730 product(intx, QueuedAllocationWarningCount, 0, \
2731 "Number of times an allocation that queues behind a GC " \
2732 "will retry before printing a warning") \
2733 \
2734 diagnostic(uintx, VerifyGCStartAt, 0, \
2735 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
2736 \
2737 diagnostic(intx, VerifyGCLevel, 0, \
2738 "Generation level at which to start +VerifyBefore/AfterGC") \
2739 \
2740 develop(uintx, ExitAfterGCNum, 0, \
2741 "If non-zero, exit after this GC.") \
2742 \
2743 product(intx, MaxTenuringThreshold, 15, \
2744 "Maximum value for tenuring threshold") \
2745 \
2746 product(intx, InitialTenuringThreshold, 7, \
2747 "Initial value for tenuring threshold") \
2748 \
2749 product(intx, TargetSurvivorRatio, 50, \
2750 "Desired percentage of survivor space used after scavenge") \
2751 \
2752 product(intx, MarkSweepDeadRatio, 5, \
2753 "Percentage (0-100) of the old gen allowed as dead wood." \
2754 "Serial mark sweep treats this as both the min and max value." \
2755 "CMS uses this value only if it falls back to mark sweep." \
2756 "Par compact uses a variable scale based on the density of the" \
2757 "generation and treats this as the max value when the heap is" \
2758 "either completely full or completely empty. Par compact also" \
2759 "has a smaller default value; see arguments.cpp.") \
2760 \
2761 product(intx, PermMarkSweepDeadRatio, 20, \
2762 "Percentage (0-100) of the perm gen allowed as dead wood." \
2763 "See MarkSweepDeadRatio for collector-specific comments.") \
2764 \
2765 product(intx, MarkSweepAlwaysCompactCount, 4, \
2766 "How often should we fully compact the heap (ignoring the dead " \
2767 "space parameters)") \
2768 \
2769 product(intx, PrintCMSStatistics, 0, \
2770 "Statistics for CMS") \
2771 \
2772 product(bool, PrintCMSInitiationStatistics, false, \
2773 "Statistics for initiating a CMS collection") \
2774 \
2775 product(intx, PrintFLSStatistics, 0, \
2776 "Statistics for CMS' FreeListSpace") \
2777 \
2778 product(intx, PrintFLSCensus, 0, \
2779 "Census for CMS' FreeListSpace") \
2780 \
2781 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
2782 "Delay in ms between expansion and allocation") \
2783 \
2784 product(intx, DeferThrSuspendLoopCount, 4000, \
2785 "(Unstable) Number of times to iterate in safepoint loop " \
2786 " before blocking VM threads ") \
2787 \
2788 product(intx, DeferPollingPageLoopCount, -1, \
2789 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
2790 "before changing safepoint polling page to RO ") \
2791 \
2792 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
2793 \
2794 product(bool, UseDepthFirstScavengeOrder, true, \
2795 "true: the scavenge order will be depth-first, " \
2796 "false: the scavenge order will be breadth-first") \
2797 \
2798 product(bool, PSChunkLargeArrays, true, \
2799 "true: process large arrays in chunks") \
2800 \
2801 product(uintx, GCDrainStackTargetSize, 64, \
2802 "how many entries we'll try to leave on the stack during " \
2803 "parallel GC") \
2804 \
2805 /* stack parameters */ \
2806 product_pd(intx, StackYellowPages, \
2807 "Number of yellow zone (recoverable overflows) pages") \
2808 \
2809 product_pd(intx, StackRedPages, \
2810 "Number of red zone (unrecoverable overflows) pages") \
2811 \
2812 product_pd(intx, StackShadowPages, \
2813 "Number of shadow zone (for overflow checking) pages" \
2814 " this should exceed the depth of the VM and native call stack") \
2815 \
2816 product_pd(intx, ThreadStackSize, \
2817 "Thread Stack Size (in Kbytes)") \
2818 \
2819 product_pd(intx, VMThreadStackSize, \
2820 "Non-Java Thread Stack Size (in Kbytes)") \
2821 \
2822 product_pd(intx, CompilerThreadStackSize, \
2823 "Compiler Thread Stack Size (in Kbytes)") \
2824 \
2825 develop_pd(uintx, JVMInvokeMethodSlack, \
2826 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
2827 \
2828 product(uintx, ThreadSafetyMargin, 50*M, \
2829 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
2830 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
2831 "disable this feature") \
2832 \
2833 /* code cache parameters */ \
2834 develop(uintx, CodeCacheSegmentSize, 64, \
2835 "Code cache segment size (in bytes) - smallest unit of " \
2836 "allocation") \
2837 \
2838 develop_pd(intx, CodeEntryAlignment, \
2839 "Code entry alignment for generated code (in bytes)") \
2840 \
2841 product_pd(uintx, InitialCodeCacheSize, \
2842 "Initial code cache size (in bytes)") \
2843 \
2844 product_pd(uintx, ReservedCodeCacheSize, \
2845 "Reserved code cache size (in bytes) - maximum code cache size") \
2846 \
2847 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
2848 "When less than X space left, we stop compiling.") \
2849 \
2850 product_pd(uintx, CodeCacheExpansionSize, \
2851 "Code cache expansion size (in bytes)") \
2852 \
2853 develop_pd(uintx, CodeCacheMinBlockLength, \
2854 "Minimum number of segments in a code cache block.") \
2855 \
2856 notproduct(bool, ExitOnFullCodeCache, false, \
2857 "Exit the VM if we fill the code cache.") \
2858 \
2859 /* interpreter debugging */ \
2860 develop(intx, BinarySwitchThreshold, 5, \
2861 "Minimal number of lookupswitch entries for rewriting to binary " \
2862 "switch") \
2863 \
2864 develop(intx, StopInterpreterAt, 0, \
2865 "Stops interpreter execution at specified bytecode number") \
2866 \
2867 develop(intx, TraceBytecodesAt, 0, \
2868 "Traces bytecodes starting with specified bytecode number") \
2869 \
2870 /* compiler interface */ \
2871 develop(intx, CIStart, 0, \
2872 "the id of the first compilation to permit") \
2873 \
2874 develop(intx, CIStop, -1, \
2875 "the id of the last compilation to permit") \
2876 \
2877 develop(intx, CIStartOSR, 0, \
2878 "the id of the first osr compilation to permit " \
2879 "(CICountOSR must be on)") \
2880 \
2881 develop(intx, CIStopOSR, -1, \
2882 "the id of the last osr compilation to permit " \
2883 "(CICountOSR must be on)") \
2884 \
2885 develop(intx, CIBreakAtOSR, -1, \
2886 "id of osr compilation to break at") \
2887 \
2888 develop(intx, CIBreakAt, -1, \
2889 "id of compilation to break at") \
2890 \
2891 product(ccstrlist, CompileOnly, "", \
2892 "List of methods (pkg/class.name) to restrict compilation to") \
2893 \
2894 product(ccstr, CompileCommandFile, NULL, \
2895 "Read compiler commands from this file [.hotspot_compiler]") \
2896 \
2897 product(ccstrlist, CompileCommand, "", \
2898 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2899 \
2900 product(bool, CICompilerCountPerCPU, false, \
2901 "1 compiler thread for log(N CPUs)") \
2902 \
2903 develop(intx, CIFireOOMAt, -1, \
2904 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
2905 "(non-negative value throws OOM after this many CI accesses " \
2906 "in each compile)") \
2907 \
2908 develop(intx, CIFireOOMAtDelay, -1, \
2909 "Wait for this many CI accesses to occur in all compiles before " \
2910 "beginning to throw OutOfMemoryErrors in each compile") \
2911 \
2912 /* Priorities */ \
2913 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
2914 \
2915 product(intx, ThreadPriorityPolicy, 0, \
2916 "0 : Normal. "\
2917 " VM chooses priorities that are appropriate for normal "\
2918 " applications. On Solaris NORM_PRIORITY and above are mapped "\
2919 " to normal native priority. Java priorities below NORM_PRIORITY"\
2920 " map to lower native priority values. On Windows applications"\
2921 " are allowed to use higher native priorities. However, with "\
2922 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
2923 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
2924 " interfere with system threads. On Linux thread priorities "\
2925 " are ignored because the OS does not support static priority "\
2926 " in SCHED_OTHER scheduling class which is the only choice for"\
2927 " non-root, non-realtime applications. "\
2928 "1 : Aggressive. "\
2929 " Java thread priorities map over to the entire range of "\
2930 " native thread priorities. Higher Java thread priorities map "\
2931 " to higher native thread priorities. This policy should be "\
2932 " used with care, as sometimes it can cause performance "\
2933 " degradation in the application and/or the entire system. On "\
2934 " Linux this policy requires root privilege.") \
2935 \
2936 product(bool, ThreadPriorityVerbose, false, \
2937 "print priority changes") \
2938 \
2939 product(intx, DefaultThreadPriority, -1, \
2940 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
2941 \
2942 product(intx, CompilerThreadPriority, -1, \
2943 "what priority should compiler threads run at (-1 means no change)") \
2944 \
2945 product(intx, VMThreadPriority, -1, \
2946 "what priority should VM threads run at (-1 means no change)") \
2947 \
2948 product(bool, CompilerThreadHintNoPreempt, true, \
2949 "(Solaris only) Give compiler threads an extra quanta") \
2950 \
2951 product(bool, VMThreadHintNoPreempt, false, \
2952 "(Solaris only) Give VM thread an extra quanta") \
2953 \
2954 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2955 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2956 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2957 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2958 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2959 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2960 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2961 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2962 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2963 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
2964 \
2965 /* compiler debugging */ \
2966 notproduct(intx, CompileTheWorldStartAt, 1, \
2967 "First class to consider when using +CompileTheWorld") \
2968 \
2969 notproduct(intx, CompileTheWorldStopAt, max_jint, \
2970 "Last class to consider when using +CompileTheWorld") \
2971 \
2972 develop(intx, NewCodeParameter, 0, \
2973 "Testing Only: Create a dedicated integer parameter before " \
2974 "putback") \
2975 \
2976 /* new oopmap storage allocation */ \
2977 develop(intx, MinOopMapAllocation, 8, \
2978 "Minimum number of OopMap entries in an OopMapSet") \
2979 \
2980 /* Background Compilation */ \
2981 develop(intx, LongCompileThreshold, 50, \
2982 "Used with +TraceLongCompiles") \
2983 \
2984 product(intx, StarvationMonitorInterval, 200, \
2985 "Pause between each check in ms") \
2986 \
2987 /* recompilation */ \
2988 product_pd(intx, CompileThreshold, \
2989 "number of interpreted method invocations before (re-)compiling") \
2990 \
2991 product_pd(intx, BackEdgeThreshold, \
2992 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
2993 \
2994 product(intx, Tier1BytecodeLimit, 10, \
2995 "Must have at least this many bytecodes before tier1" \
2996 "invocation counters are used") \
2997 \
2998 product_pd(intx, Tier2CompileThreshold, \
2999 "threshold at which a tier 2 compilation is invoked") \
3000 \
3001 product_pd(intx, Tier2BackEdgeThreshold, \
3002 "Back edge threshold at which a tier 2 compilation is invoked") \
3003 \
3004 product_pd(intx, Tier3CompileThreshold, \
3005 "threshold at which a tier 3 compilation is invoked") \
3006 \
3007 product_pd(intx, Tier3BackEdgeThreshold, \
3008 "Back edge threshold at which a tier 3 compilation is invoked") \
3009 \
3010 product_pd(intx, Tier4CompileThreshold, \
3011 "threshold at which a tier 4 compilation is invoked") \
3012 \
3013 product_pd(intx, Tier4BackEdgeThreshold, \
3014 "Back edge threshold at which a tier 4 compilation is invoked") \
3015 \
3016 product_pd(bool, TieredCompilation, \
3017 "Enable two-tier compilation") \
3018 \
3019 product(bool, StressTieredRuntime, false, \
3020 "Alternate client and server compiler on compile requests") \
3021 \
3022 product_pd(intx, OnStackReplacePercentage, \
3023 "NON_TIERED number of method invocations/branches (expressed as %"\
3024 "of CompileThreshold) before (re-)compiling OSR code") \
3025 \
3026 product(intx, InterpreterProfilePercentage, 33, \
3027 "NON_TIERED number of method invocations/branches (expressed as %"\
3028 "of CompileThreshold) before profiling in the interpreter") \
3029 \
3030 develop(intx, MaxRecompilationSearchLength, 10, \
3031 "max. # frames to inspect searching for recompilee") \
3032 \
3033 develop(intx, MaxInterpretedSearchLength, 3, \
3034 "max. # interp. frames to skip when searching for recompilee") \
3035 \
3036 develop(intx, DesiredMethodLimit, 8000, \
3037 "desired max. method size (in bytecodes) after inlining") \
3038 \
3039 develop(intx, HugeMethodLimit, 8000, \
3040 "don't compile methods larger than this if " \
3041 "+DontCompileHugeMethods") \
3042 \
3043 /* New JDK 1.4 reflection implementation */ \
3044 \
3045 develop(bool, UseNewReflection, true, \
3046 "Temporary flag for transition to reflection based on dynamic " \
3047 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3048 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3049 "changes were needed") \
3050 \
3051 develop(bool, VerifyReflectionBytecodes, false, \
3052 "Force verification of 1.4 reflection bytecodes. Does not work " \
3053 "in situations like that described in 4486457 or for " \
3054 "constructors generated for serialization, so can not be enabled "\
3055 "in product.") \
3056 \
3057 product(bool, ReflectionWrapResolutionErrors, true, \
3058 "Temporary flag for transition to AbstractMethodError wrapped " \
3059 "in InvocationTargetException. See 6531596") \
3060 \
3061 \
3062 develop(intx, FastSuperclassLimit, 8, \
3063 "Depth of hardwired instanceof accelerator array") \
3064 \
3065 /* Properties for Java libraries */ \
3066 \
3067 product(intx, MaxDirectMemorySize, -1, \
3068 "Maximum total size of NIO direct-buffer allocations") \
3069 \
3070 /* temporary developer defined flags */ \
3071 \
3072 diagnostic(bool, UseNewCode, false, \
3073 "Testing Only: Use the new version while testing") \
3074 \
3075 diagnostic(bool, UseNewCode2, false, \
3076 "Testing Only: Use the new version while testing") \
3077 \
3078 diagnostic(bool, UseNewCode3, false, \
3079 "Testing Only: Use the new version while testing") \
3080 \
3081 /* flags for performance data collection */ \
3082 \
3083 product(bool, UsePerfData, true, \
3084 "Flag to disable jvmstat instrumentation for performance testing" \
3085 "and problem isolation purposes.") \
3086 \
3087 product(bool, PerfDataSaveToFile, false, \
3088 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3089 \
3090 product(ccstr, PerfDataSaveFile, NULL, \
3091 "Save PerfData memory to the specified absolute pathname," \
3092 "%p in the file name if present will be replaced by pid") \
3093 \
3094 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3095 "Data sampling interval in milliseconds") \
3096 \
3097 develop(bool, PerfTraceDataCreation, false, \
3098 "Trace creation of Performance Data Entries") \
3099 \
3100 develop(bool, PerfTraceMemOps, false, \
3101 "Trace PerfMemory create/attach/detach calls") \
3102 \
3103 product(bool, PerfDisableSharedMem, false, \
3104 "Store performance data in standard memory") \
3105 \
3106 product(intx, PerfDataMemorySize, 32*K, \
3107 "Size of performance data memory region. Will be rounded " \
3108 "up to a multiple of the native os page size.") \
3109 \
3110 product(intx, PerfMaxStringConstLength, 1024, \
3111 "Maximum PerfStringConstant string length before truncation") \
3112 \
3113 product(bool, PerfAllowAtExitRegistration, false, \
3114 "Allow registration of atexit() methods") \
3115 \
3116 product(bool, PerfBypassFileSystemCheck, false, \
3117 "Bypass Win32 file system criteria checks (Windows Only)") \
3118 \
3119 product(intx, UnguardOnExecutionViolation, 0, \
3120 "Unguard page and retry on no-execute fault (Win32 only)" \
3121 "0=off, 1=conservative, 2=aggressive") \
3122 \
3123 /* Serviceability Support */ \
3124 \
3125 product(bool, ManagementServer, false, \
3126 "Create JMX Management Server") \
3127 \
3128 product(bool, DisableAttachMechanism, false, \
3129 "Disable mechanism that allows tools to attach to this VM") \
3130 \
3131 product(bool, StartAttachListener, false, \
3132 "Always start Attach Listener at VM startup") \
3133 \
3134 manageable(bool, PrintConcurrentLocks, false, \
3135 "Print java.util.concurrent locks in thread dump") \
3136 \
3137 /* Shared spaces */ \
3138 \
3139 product(bool, UseSharedSpaces, true, \
3140 "Use shared spaces in the permanent generation") \
3141 \
3142 product(bool, RequireSharedSpaces, false, \
3143 "Require shared spaces in the permanent generation") \
3144 \
3145 product(bool, ForceSharedSpaces, false, \
3146 "Require shared spaces in the permanent generation") \
3147 \
3148 product(bool, DumpSharedSpaces, false, \
3149 "Special mode: JVM reads a class list, loads classes, builds " \
3150 "shared spaces, and dumps the shared spaces to a file to be " \
3151 "used in future JVM runs.") \
3152 \
3153 product(bool, PrintSharedSpaces, false, \
3154 "Print usage of shared spaces") \
3155 \
3156 product(uintx, SharedDummyBlockSize, 512*M, \
3157 "Size of dummy block used to shift heap addresses (in bytes)") \
3158 \
3159 product(uintx, SharedReadWriteSize, 12*M, \
3160 "Size of read-write space in permanent generation (in bytes)") \
3161 \
3162 product(uintx, SharedReadOnlySize, 8*M, \
3163 "Size of read-only space in permanent generation (in bytes)") \
3164 \
3165 product(uintx, SharedMiscDataSize, 4*M, \
3166 "Size of the shared data area adjacent to the heap (in bytes)") \
3167 \
3168 product(uintx, SharedMiscCodeSize, 4*M, \
3169 "Size of the shared code area adjacent to the heap (in bytes)") \
3170 \
3171 diagnostic(bool, SharedOptimizeColdStart, true, \
3172 "At dump time, order shared objects to achieve better " \
3173 "cold startup time.") \
3174 \
3175 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3176 "Reordering policy for SharedOptimizeColdStart " \
3177 "0=favor classload-time locality, 1=balanced, " \
3178 "2=favor runtime locality") \
3179 \
3180 diagnostic(bool, SharedSkipVerify, false, \
3181 "Skip assert() and verify() which page-in unwanted shared " \
3182 "objects. ") \
3183 \
3184 product(bool, TaggedStackInterpreter, false, \
3185 "Insert tags in interpreter execution stack for oopmap generaion")\
3186 \
3187 diagnostic(bool, PauseAtStartup, false, \
3188 "Causes the VM to pause at startup time and wait for the pause " \
3189 "file to be removed (default: ./vm.paused.<pid>)") \
3190 \
3191 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3192 "The file to create and for whose removal to await when pausing " \
3193 "at startup. (default: ./vm.paused.<pid>)") \
3194 \
3195 product(bool, ExtendedDTraceProbes, false, \
3196 "Enable performance-impacting dtrace probes") \
3197 \
3198 product(bool, DTraceMethodProbes, false, \
3199 "Enable dtrace probes for method-entry and method-exit") \
3200 \
3201 product(bool, DTraceAllocProbes, false, \
3202 "Enable dtrace probes for object allocation") \
3203 \
3204 product(bool, DTraceMonitorProbes, false, \
3205 "Enable dtrace probes for monitor events") \
3206 \
3207 product(bool, RelaxAccessControlCheck, false, \
3208 "Relax the access control checks in the verifier") \
3209 \
3210 diagnostic(bool, PrintDTraceDOF, false, \
3211 "Print the DTrace DOF passed to the system for JSDT probes") \
3212 \
3213 product(bool, UseVMInterruptibleIO, true, \
3214 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3215 "EINTR for I/O operations results in OS_INTRPT")
3218 /*
3219 * Macros for factoring of globals
3220 */
3222 // Interface macros
3223 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3224 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3225 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3226 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3227 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3228 #ifdef PRODUCT
3229 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3230 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3231 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3232 #else
3233 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3234 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3235 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3236 #endif
3237 // Special LP64 flags, product only needed for now.
3238 #ifdef _LP64
3239 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3240 #else
3241 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3242 #endif // _LP64
3244 // Implementation macros
3245 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3246 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3247 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3248 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3249 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3250 #ifdef PRODUCT
3251 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3252 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3253 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3254 #else
3255 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3256 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3257 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3258 #endif
3259 #ifdef _LP64
3260 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3261 #else
3262 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3263 #endif // _LP64
3265 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3267 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)