1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/debug.hpp"
29 #ifdef TARGET_ARCH_x86
30 # include "globals_x86.hpp"
31 #endif
32 #ifdef TARGET_ARCH_sparc
33 # include "globals_sparc.hpp"
34 #endif
35 #ifdef TARGET_ARCH_zero
36 # include "globals_zero.hpp"
37 #endif
38 #ifdef TARGET_OS_FAMILY_linux
39 # include "globals_linux.hpp"
40 #endif
41 #ifdef TARGET_OS_FAMILY_solaris
42 # include "globals_solaris.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_windows
45 # include "globals_windows.hpp"
46 #endif
47 #ifdef TARGET_OS_ARCH_linux_x86
48 # include "globals_linux_x86.hpp"
49 #endif
50 #ifdef TARGET_OS_ARCH_linux_sparc
51 # include "globals_linux_sparc.hpp"
52 #endif
53 #ifdef TARGET_OS_ARCH_linux_zero
54 # include "globals_linux_zero.hpp"
55 #endif
56 #ifdef TARGET_OS_ARCH_solaris_x86
57 # include "globals_solaris_x86.hpp"
58 #endif
59 #ifdef TARGET_OS_ARCH_solaris_sparc
60 # include "globals_solaris_sparc.hpp"
61 #endif
62 #ifdef TARGET_OS_ARCH_windows_x86
63 # include "globals_windows_x86.hpp"
64 #endif
65 #ifdef COMPILER1
66 #ifdef TARGET_ARCH_x86
67 # include "c1_globals_x86.hpp"
68 #endif
69 #ifdef TARGET_ARCH_sparc
70 # include "c1_globals_sparc.hpp"
71 #endif
72 #ifdef TARGET_OS_FAMILY_linux
73 # include "c1_globals_linux.hpp"
74 #endif
75 #ifdef TARGET_OS_FAMILY_solaris
76 # include "c1_globals_solaris.hpp"
77 #endif
78 #ifdef TARGET_OS_FAMILY_windows
79 # include "c1_globals_windows.hpp"
80 #endif
81 #endif
82 #ifdef COMPILER2
83 #ifdef TARGET_ARCH_x86
84 # include "c2_globals_x86.hpp"
85 #endif
86 #ifdef TARGET_ARCH_sparc
87 # include "c2_globals_sparc.hpp"
88 #endif
89 #ifdef TARGET_OS_FAMILY_linux
90 # include "c2_globals_linux.hpp"
91 #endif
92 #ifdef TARGET_OS_FAMILY_solaris
93 # include "c2_globals_solaris.hpp"
94 #endif
95 #ifdef TARGET_OS_FAMILY_windows
96 # include "c2_globals_windows.hpp"
97 #endif
98 #endif
99 #ifdef SHARK
100 #ifdef TARGET_ARCH_zero
101 # include "shark_globals_zero.hpp"
102 #endif
103 #endif
104
105 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
106 define_pd_global(bool, BackgroundCompilation, false);
107 define_pd_global(bool, UseTLAB, false);
108 define_pd_global(bool, CICompileOSR, false);
109 define_pd_global(bool, UseTypeProfile, false);
110 define_pd_global(bool, UseOnStackReplacement, false);
111 define_pd_global(bool, InlineIntrinsics, false);
112 define_pd_global(bool, PreferInterpreterNativeStubs, true);
113 define_pd_global(bool, ProfileInterpreter, false);
114 define_pd_global(bool, ProfileTraps, false);
115 define_pd_global(bool, TieredCompilation, false);
116
117 define_pd_global(intx, CompileThreshold, 0);
118 define_pd_global(intx, BackEdgeThreshold, 0);
119
120 define_pd_global(intx, OnStackReplacePercentage, 0);
121 define_pd_global(bool, ResizeTLAB, false);
122 define_pd_global(intx, FreqInlineSize, 0);
123 define_pd_global(intx, InlineSmallCode, 0);
124 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
125 define_pd_global(intx, InlineClassNatives, true);
126 define_pd_global(intx, InlineUnsafeOps, true);
127 define_pd_global(intx, InitialCodeCacheSize, 160*K);
128 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
129 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
130 define_pd_global(intx, CodeCacheMinBlockLength, 1);
131 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
132 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
133 define_pd_global(bool, NeverActAsServerClassMachine, true);
134 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
135 #define CI_COMPILER_COUNT 0
136 #else
137
138 #ifdef COMPILER2
139 #define CI_COMPILER_COUNT 2
140 #else
141 #define CI_COMPILER_COUNT 1
142 #endif // COMPILER2
143
144 #endif // no compilers
145
146
147 // string type aliases used only in this file
148 typedef const char* ccstr;
149 typedef const char* ccstrlist; // represents string arguments which accumulate
150
151 enum FlagValueOrigin {
152 DEFAULT = 0,
153 COMMAND_LINE = 1,
154 ENVIRON_VAR = 2,
155 CONFIG_FILE = 3,
156 MANAGEMENT = 4,
157 ERGONOMIC = 5,
158 ATTACH_ON_DEMAND = 6,
159 INTERNAL = 99
160 };
161
162 struct Flag {
163 const char *type;
164 const char *name;
165 void* addr;
166
167 NOT_PRODUCT(const char *doc;)
168
169 const char *kind;
170 FlagValueOrigin origin;
171
172 // points to all Flags static array
173 static Flag *flags;
174
175 // number of flags
176 static size_t numFlags;
177
178 static Flag* find_flag(char* name, size_t length);
179
180 bool is_bool() const { return strcmp(type, "bool") == 0; }
181 bool get_bool() const { return *((bool*) addr); }
182 void set_bool(bool value) { *((bool*) addr) = value; }
183
184 bool is_intx() const { return strcmp(type, "intx") == 0; }
185 intx get_intx() const { return *((intx*) addr); }
186 void set_intx(intx value) { *((intx*) addr) = value; }
187
188 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
189 uintx get_uintx() const { return *((uintx*) addr); }
190 void set_uintx(uintx value) { *((uintx*) addr) = value; }
191
192 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
193 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
194 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
195
196 bool is_double() const { return strcmp(type, "double") == 0; }
197 double get_double() const { return *((double*) addr); }
198 void set_double(double value) { *((double*) addr) = value; }
199
200 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
201 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
202 ccstr get_ccstr() const { return *((ccstr*) addr); }
203 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
204
205 bool is_unlocker() const;
206 bool is_unlocked() const;
207 bool is_writeable() const;
208 bool is_external() const;
209
210 void print_on(outputStream* st, bool withComments = false );
211 void print_as_flag(outputStream* st);
212 };
213
214 // debug flags control various aspects of the VM and are global accessible
215
216 // use FlagSetting to temporarily change some debug flag
217 // e.g. FlagSetting fs(DebugThisAndThat, true);
218 // restored to previous value upon leaving scope
219 class FlagSetting {
220 bool val;
221 bool* flag;
222 public:
223 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
224 ~FlagSetting() { *flag = val; }
225 };
226
227
228 class CounterSetting {
229 intx* counter;
230 public:
231 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
232 ~CounterSetting() { (*counter)--; }
233 };
234
235
236 class IntFlagSetting {
237 intx val;
238 intx* flag;
239 public:
240 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
241 ~IntFlagSetting() { *flag = val; }
242 };
243
244
245 class DoubleFlagSetting {
246 double val;
247 double* flag;
248 public:
249 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
250 ~DoubleFlagSetting() { *flag = val; }
251 };
252
253
254 class CommandLineFlags {
255 public:
256 static bool boolAt(char* name, size_t len, bool* value);
257 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
258 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
259 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
260
261 static bool intxAt(char* name, size_t len, intx* value);
262 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
263 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
264 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
265
266 static bool uintxAt(char* name, size_t len, uintx* value);
267 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
268 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
269 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
270
271 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
272 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
273 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
274 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
275
276 static bool doubleAt(char* name, size_t len, double* value);
277 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
278 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
279 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
280
281 static bool ccstrAt(char* name, size_t len, ccstr* value);
282 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
283 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
284 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
285
286 // Returns false if name is not a command line flag.
287 static bool wasSetOnCmdline(const char* name, bool* value);
288 static void printSetFlags();
289
290 static void printFlags(bool withComments = false );
291
292 static void verify() PRODUCT_RETURN;
293 };
294
295 // use this for flags that are true by default in the debug version but
296 // false in the optimized version, and vice versa
297 #ifdef ASSERT
298 #define trueInDebug true
299 #define falseInDebug false
300 #else
301 #define trueInDebug false
302 #define falseInDebug true
303 #endif
304
305 // use this for flags that are true per default in the product build
306 // but false in development builds, and vice versa
307 #ifdef PRODUCT
308 #define trueInProduct true
309 #define falseInProduct false
310 #else
311 #define trueInProduct false
312 #define falseInProduct true
313 #endif
314
315 // use this for flags that are true per default in the tiered build
316 // but false in non-tiered builds, and vice versa
317 #ifdef TIERED
318 #define trueInTiered true
319 #define falseInTiered false
320 #else
321 #define trueInTiered false
322 #define falseInTiered true
323 #endif
324
325 // develop flags are settable / visible only during development and are constant in the PRODUCT version
326 // product flags are always settable / visible
327 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
328
329 // A flag must be declared with one of the following types:
330 // bool, intx, uintx, ccstr.
331 // The type "ccstr" is an alias for "const char*" and is used
332 // only in this file, because the macrology requires single-token type names.
333
334 // Note: Diagnostic options not meant for VM tuning or for product modes.
335 // They are to be used for VM quality assurance or field diagnosis
336 // of VM bugs. They are hidden so that users will not be encouraged to
337 // try them as if they were VM ordinary execution options. However, they
338 // are available in the product version of the VM. Under instruction
339 // from support engineers, VM customers can turn them on to collect
340 // diagnostic information about VM problems. To use a VM diagnostic
341 // option, you must first specify +UnlockDiagnosticVMOptions.
342 // (This master switch also affects the behavior of -Xprintflags.)
343 //
344 // experimental flags are in support of features that are not
345 // part of the officially supported product, but are available
346 // for experimenting with. They could, for example, be performance
347 // features that may not have undergone full or rigorous QA, but which may
348 // help performance in some cases and released for experimentation
349 // by the community of users and developers. This flag also allows one to
350 // be able to build a fully supported product that nonetheless also
351 // ships with some unsupported, lightly tested, experimental features.
352 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
353 // UnlockExperimentalVMOptions flag, which allows the control and
354 // modification of the experimental flags.
355 //
356 // Nota bene: neither diagnostic nor experimental options should be used casually,
357 // and they are not supported on production loads, except under explicit
358 // direction from support engineers.
359 //
360 // manageable flags are writeable external product flags.
361 // They are dynamically writeable through the JDK management interface
362 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
363 // These flags are external exported interface (see CCC). The list of
364 // manageable flags can be queried programmatically through the management
365 // interface.
366 //
367 // A flag can be made as "manageable" only if
368 // - the flag is defined in a CCC as an external exported interface.
369 // - the VM implementation supports dynamic setting of the flag.
370 // This implies that the VM must *always* query the flag variable
371 // and not reuse state related to the flag state at any given time.
372 // - you want the flag to be queried programmatically by the customers.
373 //
374 // product_rw flags are writeable internal product flags.
375 // They are like "manageable" flags but for internal/private use.
376 // The list of product_rw flags are internal/private flags which
377 // may be changed/removed in a future release. It can be set
378 // through the management interface to get/set value
379 // when the name of flag is supplied.
380 //
381 // A flag can be made as "product_rw" only if
382 // - the VM implementation supports dynamic setting of the flag.
383 // This implies that the VM must *always* query the flag variable
384 // and not reuse state related to the flag state at any given time.
385 //
386 // Note that when there is a need to support develop flags to be writeable,
387 // it can be done in the same way as product_rw.
388
389 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
390 \
391 lp64_product(bool, UseCompressedOops, false, \
392 "Use 32-bit object references in 64-bit VM. " \
393 "lp64_product means flag is always constant in 32 bit VM") \
394 \
395 notproduct(bool, CheckCompressedOops, true, \
396 "generate checks in encoding/decoding code in debug VM") \
397 \
398 product_pd(uintx, HeapBaseMinAddress, \
399 "OS specific low limit for heap base address") \
400 \
401 diagnostic(bool, PrintCompressedOopsMode, false, \
402 "Print compressed oops base address and encoding mode") \
403 \
404 lp64_product(intx, ObjectAlignmentInBytes, 8, \
405 "Default object alignment in bytes, 8 is minimum") \
406 \
407 /* UseMembar is theoretically a temp flag used for memory barrier \
408 * removal testing. It was supposed to be removed before FCS but has \
409 * been re-added (see 6401008) */ \
410 product_pd(bool, UseMembar, \
411 "(Unstable) Issues membars on thread state transitions") \
412 \
413 /* Temporary: See 6948537 */ \
414 experimental(bool, UseMemSetInBOT, true, \
415 "(Unstable) uses memset in BOT updates in GC code") \
416 \
417 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
418 "Enable normal processing of flags relating to field diagnostics")\
419 \
420 experimental(bool, UnlockExperimentalVMOptions, false, \
421 "Enable normal processing of flags relating to experimental features")\
422 \
423 product(bool, JavaMonitorsInStackTrace, true, \
424 "Print info. about Java monitor locks when the stacks are dumped")\
425 \
426 product_pd(bool, UseLargePages, \
427 "Use large page memory") \
428 \
429 product_pd(bool, UseLargePagesIndividualAllocation, \
430 "Allocate large pages individually for better affinity") \
431 \
432 develop(bool, LargePagesIndividualAllocationInjectError, false, \
433 "Fail large pages individual allocation") \
434 \
435 develop(bool, TracePageSizes, false, \
436 "Trace page size selection and usage.") \
437 \
438 product(bool, UseNUMA, false, \
439 "Use NUMA if available") \
440 \
441 product(bool, ForceNUMA, false, \
442 "Force NUMA optimizations on single-node/UMA systems") \
443 \
444 product(intx, NUMAChunkResizeWeight, 20, \
445 "Percentage (0-100) used to weight the current sample when " \
446 "computing exponentially decaying average for " \
447 "AdaptiveNUMAChunkSizing") \
448 \
449 product(intx, NUMASpaceResizeRate, 1*G, \
450 "Do not reallocate more that this amount per collection") \
451 \
452 product(bool, UseAdaptiveNUMAChunkSizing, true, \
453 "Enable adaptive chunk sizing for NUMA") \
454 \
455 product(bool, NUMAStats, false, \
456 "Print NUMA stats in detailed heap information") \
457 \
458 product(intx, NUMAPageScanRate, 256, \
459 "Maximum number of pages to include in the page scan procedure") \
460 \
461 product_pd(bool, NeedsDeoptSuspend, \
462 "True for register window machines (sparc/ia64)") \
463 \
464 product(intx, UseSSE, 99, \
465 "Highest supported SSE instructions set on x86/x64") \
466 \
467 product(uintx, LargePageSizeInBytes, 0, \
468 "Large page size (0 to let VM choose the page size") \
469 \
470 product(uintx, LargePageHeapSizeThreshold, 128*M, \
471 "Use large pages if max heap is at least this big") \
472 \
473 product(bool, ForceTimeHighResolution, false, \
474 "Using high time resolution(For Win32 only)") \
475 \
476 develop(bool, TraceItables, false, \
477 "Trace initialization and use of itables") \
478 \
479 develop(bool, TracePcPatching, false, \
480 "Trace usage of frame::patch_pc") \
481 \
482 develop(bool, TraceJumps, false, \
483 "Trace assembly jumps in thread ring buffer") \
484 \
485 develop(bool, TraceRelocator, false, \
486 "Trace the bytecode relocator") \
487 \
488 develop(bool, TraceLongCompiles, false, \
489 "Print out every time compilation is longer than " \
490 "a given threashold") \
491 \
492 develop(bool, SafepointALot, false, \
493 "Generates a lot of safepoints. Works with " \
494 "GuaranteedSafepointInterval") \
495 \
496 product_pd(bool, BackgroundCompilation, \
497 "A thread requesting compilation is not blocked during " \
498 "compilation") \
499 \
500 product(bool, PrintVMQWaitTime, false, \
501 "Prints out the waiting time in VM operation queue") \
502 \
503 develop(bool, BailoutToInterpreterForThrows, false, \
504 "Compiled methods which throws/catches exceptions will be " \
505 "deopt and intp.") \
506 \
507 develop(bool, NoYieldsInMicrolock, false, \
508 "Disable yields in microlock") \
509 \
510 develop(bool, TraceOopMapGeneration, false, \
511 "Shows oopmap generation") \
512 \
513 product(bool, MethodFlushing, true, \
514 "Reclamation of zombie and not-entrant methods") \
515 \
516 develop(bool, VerifyStack, false, \
517 "Verify stack of each thread when it is entering a runtime call") \
518 \
519 develop(bool, ForceUnreachable, false, \
520 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
521 \
522 notproduct(bool, StressDerivedPointers, false, \
523 "Force scavenge when a derived pointers is detected on stack " \
524 "after rtm call") \
525 \
526 develop(bool, TraceDerivedPointers, false, \
527 "Trace traversal of derived pointers on stack") \
528 \
529 notproduct(bool, TraceCodeBlobStacks, false, \
530 "Trace stack-walk of codeblobs") \
531 \
532 product(bool, PrintJNIResolving, false, \
533 "Used to implement -v:jni") \
534 \
535 notproduct(bool, PrintRewrites, false, \
536 "Print methods that are being rewritten") \
537 \
538 product(bool, UseInlineCaches, true, \
539 "Use Inline Caches for virtual calls ") \
540 \
541 develop(bool, InlineArrayCopy, true, \
542 "inline arraycopy native that is known to be part of " \
543 "base library DLL") \
544 \
545 develop(bool, InlineObjectHash, true, \
546 "inline Object::hashCode() native that is known to be part " \
547 "of base library DLL") \
548 \
549 develop(bool, InlineObjectCopy, true, \
550 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
551 \
552 develop(bool, InlineNatives, true, \
553 "inline natives that are known to be part of base library DLL") \
554 \
555 develop(bool, InlineMathNatives, true, \
556 "inline SinD, CosD, etc.") \
557 \
558 develop(bool, InlineClassNatives, true, \
559 "inline Class.isInstance, etc") \
560 \
561 develop(bool, InlineAtomicLong, true, \
562 "inline sun.misc.AtomicLong") \
563 \
564 develop(bool, InlineThreadNatives, true, \
565 "inline Thread.currentThread, etc") \
566 \
567 develop(bool, InlineReflectionGetCallerClass, true, \
568 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
569 "of base library DLL") \
570 \
571 develop(bool, InlineUnsafeOps, true, \
572 "inline memory ops (native methods) from sun.misc.Unsafe") \
573 \
574 develop(bool, ConvertCmpD2CmpF, true, \
575 "Convert cmpD to cmpF when one input is constant in float range") \
576 \
577 develop(bool, ConvertFloat2IntClipping, true, \
578 "Convert float2int clipping idiom to integer clipping") \
579 \
580 develop(bool, SpecialStringCompareTo, true, \
581 "special version of string compareTo") \
582 \
583 develop(bool, SpecialStringIndexOf, true, \
584 "special version of string indexOf") \
585 \
586 develop(bool, SpecialStringEquals, true, \
587 "special version of string equals") \
588 \
589 develop(bool, SpecialArraysEquals, true, \
590 "special version of Arrays.equals(char[],char[])") \
591 \
592 product(bool, UseSSE42Intrinsics, false, \
593 "SSE4.2 versions of intrinsics") \
594 \
595 develop(bool, TraceCallFixup, false, \
596 "traces all call fixups") \
597 \
598 develop(bool, DeoptimizeALot, false, \
599 "deoptimize at every exit from the runtime system") \
600 \
601 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
602 "a comma separated list of bcis to deoptimize at") \
603 \
604 product(bool, DeoptimizeRandom, false, \
605 "deoptimize random frames on random exit from the runtime system")\
606 \
607 notproduct(bool, ZombieALot, false, \
608 "creates zombies (non-entrant) at exit from the runt. system") \
609 \
610 product(bool, UnlinkSymbolsALot, false, \
611 "unlink unreferenced symbols from the symbol table at safepoints")\
612 \
613 notproduct(bool, WalkStackALot, false, \
614 "trace stack (no print) at every exit from the runtime system") \
615 \
616 develop(bool, Debugging, false, \
617 "set when executing debug methods in debug.ccp " \
618 "(to prevent triggering assertions)") \
619 \
620 notproduct(bool, StrictSafepointChecks, trueInDebug, \
621 "Enable strict checks that safepoints cannot happen for threads " \
622 "that used No_Safepoint_Verifier") \
623 \
624 notproduct(bool, VerifyLastFrame, false, \
625 "Verify oops on last frame on entry to VM") \
626 \
627 develop(bool, TraceHandleAllocation, false, \
628 "Prints out warnings when suspicious many handles are allocated") \
629 \
630 product(bool, UseCompilerSafepoints, true, \
631 "Stop at safepoints in compiled code") \
632 \
633 product(bool, UseSplitVerifier, true, \
634 "use split verifier with StackMapTable attributes") \
635 \
636 product(bool, FailOverToOldVerifier, true, \
637 "fail over to old verifier when split verifier fails") \
638 \
639 develop(bool, ShowSafepointMsgs, false, \
640 "Show msg. about safepoint synch.") \
641 \
642 product(bool, SafepointTimeout, false, \
643 "Time out and warn or fail after SafepointTimeoutDelay " \
644 "milliseconds if failed to reach safepoint") \
645 \
646 develop(bool, DieOnSafepointTimeout, false, \
647 "Die upon failure to reach safepoint (see SafepointTimeout)") \
648 \
649 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
650 /* typically, at most a few retries are needed */ \
651 product(intx, SuspendRetryCount, 50, \
652 "Maximum retry count for an external suspend request") \
653 \
654 product(intx, SuspendRetryDelay, 5, \
655 "Milliseconds to delay per retry (* current_retry_count)") \
656 \
657 product(bool, AssertOnSuspendWaitFailure, false, \
658 "Assert/Guarantee on external suspend wait failure") \
659 \
660 product(bool, TraceSuspendWaitFailures, false, \
661 "Trace external suspend wait failures") \
662 \
663 product(bool, MaxFDLimit, true, \
664 "Bump the number of file descriptors to max in solaris.") \
665 \
666 notproduct(bool, LogEvents, trueInDebug, \
667 "Enable Event log") \
668 \
669 product(bool, BytecodeVerificationRemote, true, \
670 "Enables the Java bytecode verifier for remote classes") \
671 \
672 product(bool, BytecodeVerificationLocal, false, \
673 "Enables the Java bytecode verifier for local classes") \
674 \
675 develop(bool, ForceFloatExceptions, trueInDebug, \
676 "Force exceptions on FP stack under/overflow") \
677 \
678 develop(bool, SoftMatchFailure, trueInProduct, \
679 "If the DFA fails to match a node, print a message and bail out") \
680 \
681 develop(bool, VerifyStackAtCalls, false, \
682 "Verify that the stack pointer is unchanged after calls") \
683 \
684 develop(bool, TraceJavaAssertions, false, \
685 "Trace java language assertions") \
686 \
687 notproduct(bool, CheckAssertionStatusDirectives, false, \
688 "temporary - see javaClasses.cpp") \
689 \
690 notproduct(bool, PrintMallocFree, false, \
691 "Trace calls to C heap malloc/free allocation") \
692 \
693 product(bool, PrintOopAddress, false, \
694 "Always print the location of the oop") \
695 \
696 notproduct(bool, VerifyCodeCacheOften, false, \
697 "Verify compiled-code cache often") \
698 \
699 develop(bool, ZapDeadCompiledLocals, false, \
700 "Zap dead locals in compiler frames") \
701 \
702 notproduct(bool, ZapDeadLocalsOld, false, \
703 "Zap dead locals (old version, zaps all frames when " \
704 "entering the VM") \
705 \
706 notproduct(bool, CheckOopishValues, false, \
707 "Warn if value contains oop ( requires ZapDeadLocals)") \
708 \
709 develop(bool, UseMallocOnly, false, \
710 "use only malloc/free for allocation (no resource area/arena)") \
711 \
712 develop(bool, PrintMalloc, false, \
713 "print all malloc/free calls") \
714 \
715 develop(bool, ZapResourceArea, trueInDebug, \
716 "Zap freed resource/arena space with 0xABABABAB") \
717 \
718 notproduct(bool, ZapVMHandleArea, trueInDebug, \
719 "Zap freed VM handle space with 0xBCBCBCBC") \
720 \
721 develop(bool, ZapJNIHandleArea, trueInDebug, \
722 "Zap freed JNI handle space with 0xFEFEFEFE") \
723 \
724 notproduct(bool, ZapStackSegments, trueInDebug, \
725 "Zap allocated/freed Stack segments with 0xFADFADED") \
726 \
727 develop(bool, ZapUnusedHeapArea, trueInDebug, \
728 "Zap unused heap space with 0xBAADBABE") \
729 \
730 develop(bool, TraceZapUnusedHeapArea, false, \
731 "Trace zapping of unused heap space") \
732 \
733 develop(bool, CheckZapUnusedHeapArea, false, \
734 "Check zapping of unused heap space") \
735 \
736 develop(bool, ZapFillerObjects, trueInDebug, \
737 "Zap filler objects with 0xDEAFBABE") \
738 \
739 develop(bool, PrintVMMessages, true, \
740 "Print vm messages on console") \
741 \
742 product(bool, PrintGCApplicationConcurrentTime, false, \
743 "Print the time the application has been running") \
744 \
745 product(bool, PrintGCApplicationStoppedTime, false, \
746 "Print the time the application has been stopped") \
747 \
748 notproduct(uintx, ErrorHandlerTest, 0, \
749 "If > 0, provokes an error after VM initialization; the value" \
750 "determines which error to provoke. See test_error_handler()" \
751 "in debug.cpp.") \
752 \
753 develop(bool, Verbose, false, \
754 "Prints additional debugging information from other modes") \
755 \
756 develop(bool, PrintMiscellaneous, false, \
757 "Prints uncategorized debugging information (requires +Verbose)") \
758 \
759 develop(bool, WizardMode, false, \
760 "Prints much more debugging information") \
761 \
762 product(bool, ShowMessageBoxOnError, false, \
763 "Keep process alive on VM fatal error") \
764 \
765 product_pd(bool, UseOSErrorReporting, \
766 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
767 \
768 product(bool, SuppressFatalErrorMessage, false, \
769 "Do NO Fatal Error report [Avoid deadlock]") \
770 \
771 product(ccstrlist, OnError, "", \
772 "Run user-defined commands on fatal error; see VMError.cpp " \
773 "for examples") \
774 \
775 product(ccstrlist, OnOutOfMemoryError, "", \
776 "Run user-defined commands on first java.lang.OutOfMemoryError") \
777 \
778 manageable(bool, HeapDumpBeforeFullGC, false, \
779 "Dump heap to file before any major stop-world GC") \
780 \
781 manageable(bool, HeapDumpAfterFullGC, false, \
782 "Dump heap to file after any major stop-world GC") \
783 \
784 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
785 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
786 \
787 manageable(ccstr, HeapDumpPath, NULL, \
788 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
789 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
790 "in the working directory)") \
791 \
792 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
793 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
794 "when the heap usage is larger than this") \
795 \
796 develop(uintx, HeapDumpSegmentSize, 1*G, \
797 "Approximate segment size when generating a segmented heap dump") \
798 \
799 develop(bool, BreakAtWarning, false, \
800 "Execute breakpoint upon encountering VM warning") \
801 \
802 product_pd(bool, UseVectoredExceptions, \
803 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
804 \
805 develop(bool, TraceVMOperation, false, \
806 "Trace vm operations") \
807 \
808 develop(bool, UseFakeTimers, false, \
809 "Tells whether the VM should use system time or a fake timer") \
810 \
811 diagnostic(bool, LogCompilation, false, \
812 "Log compilation activity in detail to hotspot.log or LogFile") \
813 \
814 product(bool, PrintCompilation, false, \
815 "Print compilations") \
816 \
817 diagnostic(bool, TraceNMethodInstalls, false, \
818 "Trace nmethod intallation") \
819 \
820 diagnostic(intx, ScavengeRootsInCode, 0, \
821 "0: do not allow scavengable oops in the code cache; " \
822 "1: allow scavenging from the code cache; " \
823 "2: emit as many constants as the compiler can see") \
824 \
825 diagnostic(bool, TraceOSRBreakpoint, false, \
826 "Trace OSR Breakpoint ") \
827 \
828 diagnostic(bool, TraceCompileTriggered, false, \
829 "Trace compile triggered") \
830 \
831 diagnostic(bool, TraceTriggers, false, \
832 "Trace triggers") \
833 \
834 product(bool, AlwaysRestoreFPU, false, \
835 "Restore the FPU control word after every JNI call (expensive)") \
836 \
837 notproduct(bool, PrintCompilation2, false, \
838 "Print additional statistics per compilation") \
839 \
840 diagnostic(bool, PrintAdapterHandlers, false, \
841 "Print code generated for i2c/c2i adapters") \
842 \
843 develop(bool, VerifyAdapterSharing, false, \
844 "Verify that the code for shared adapters is the equivalent") \
845 \
846 diagnostic(bool, PrintAssembly, false, \
847 "Print assembly code (using external disassembler.so)") \
848 \
849 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
850 "Options string passed to disassembler.so") \
851 \
852 diagnostic(bool, PrintNMethods, false, \
853 "Print assembly code for nmethods when generated") \
854 \
855 diagnostic(bool, PrintNativeNMethods, false, \
856 "Print assembly code for native nmethods when generated") \
857 \
858 develop(bool, PrintDebugInfo, false, \
859 "Print debug information for all nmethods when generated") \
860 \
861 develop(bool, PrintRelocations, false, \
862 "Print relocation information for all nmethods when generated") \
863 \
864 develop(bool, PrintDependencies, false, \
865 "Print dependency information for all nmethods when generated") \
866 \
867 develop(bool, PrintExceptionHandlers, false, \
868 "Print exception handler tables for all nmethods when generated") \
869 \
870 develop(bool, InterceptOSException, false, \
871 "Starts debugger when an implicit OS (e.g., NULL) " \
872 "exception happens") \
873 \
874 notproduct(bool, PrintCodeCache, false, \
875 "Print the compiled_code cache when exiting") \
876 \
877 develop(bool, PrintCodeCache2, false, \
878 "Print detailed info on the compiled_code cache when exiting") \
879 \
880 diagnostic(bool, PrintStubCode, false, \
881 "Print generated stub code") \
882 \
883 product(bool, StackTraceInThrowable, true, \
884 "Collect backtrace in throwable when exception happens") \
885 \
886 product(bool, OmitStackTraceInFastThrow, true, \
887 "Omit backtraces for some 'hot' exceptions in optimized code") \
888 \
889 product(bool, ProfilerPrintByteCodeStatistics, false, \
890 "Prints byte code statictics when dumping profiler output") \
891 \
892 product(bool, ProfilerRecordPC, false, \
893 "Collects tick for each 16 byte interval of compiled code") \
894 \
895 product(bool, ProfileVM, false, \
896 "Profiles ticks that fall within VM (either in the VM Thread " \
897 "or VM code called through stubs)") \
898 \
899 product(bool, ProfileIntervals, false, \
900 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
901 \
902 notproduct(bool, ProfilerCheckIntervals, false, \
903 "Collect and print info on spacing of profiler ticks") \
904 \
905 develop(bool, PrintJVMWarnings, false, \
906 "Prints warnings for unimplemented JVM functions") \
907 \
908 product(bool, PrintWarnings, true, \
909 "Prints JVM warnings to output stream") \
910 \
911 notproduct(uintx, WarnOnStalledSpinLock, 0, \
912 "Prints warnings for stalled SpinLocks") \
913 \
914 develop(bool, InitializeJavaLangSystem, true, \
915 "Initialize java.lang.System - turn off for individual " \
916 "method debugging") \
917 \
918 develop(bool, InitializeJavaLangString, true, \
919 "Initialize java.lang.String - turn off for individual " \
920 "method debugging") \
921 \
922 develop(bool, InitializeJavaLangExceptionsErrors, true, \
923 "Initialize various error and exception classes - turn off for " \
924 "individual method debugging") \
925 \
926 product(bool, RegisterFinalizersAtInit, true, \
927 "Register finalizable objects at end of Object.<init> or " \
928 "after allocation") \
929 \
930 develop(bool, RegisterReferences, true, \
931 "Tells whether the VM should register soft/weak/final/phantom " \
932 "references") \
933 \
934 develop(bool, IgnoreRewrites, false, \
935 "Supress rewrites of bytecodes in the oopmap generator. " \
936 "This is unsafe!") \
937 \
938 develop(bool, PrintCodeCacheExtension, false, \
939 "Print extension of code cache") \
940 \
941 develop(bool, UsePrivilegedStack, true, \
942 "Enable the security JVM functions") \
943 \
944 develop(bool, IEEEPrecision, true, \
945 "Enables IEEE precision (for INTEL only)") \
946 \
947 develop(bool, ProtectionDomainVerification, true, \
948 "Verifies protection domain before resolution in system " \
949 "dictionary") \
950 \
951 product(bool, ClassUnloading, true, \
952 "Do unloading of classes") \
953 \
954 diagnostic(bool, LinkWellKnownClasses, false, \
955 "Resolve a well known class as soon as its name is seen") \
956 \
957 develop(bool, DisableStartThread, false, \
958 "Disable starting of additional Java threads " \
959 "(for debugging only)") \
960 \
961 develop(bool, MemProfiling, false, \
962 "Write memory usage profiling to log file") \
963 \
964 notproduct(bool, PrintSystemDictionaryAtExit, false, \
965 "Prints the system dictionary at exit") \
966 \
967 diagnostic(bool, UnsyncloadClass, false, \
968 "Unstable: VM calls loadClass unsynchronized. Custom " \
969 "class loader must call VM synchronized for findClass " \
970 "and defineClass.") \
971 \
972 product(bool, AlwaysLockClassLoader, false, \
973 "Require the VM to acquire the class loader lock before calling " \
974 "loadClass() even for class loaders registering " \
975 "as parallel capable") \
976 \
977 product(bool, AllowParallelDefineClass, false, \
978 "Allow parallel defineClass requests for class loaders " \
979 "registering as parallel capable") \
980 \
981 product(bool, MustCallLoadClassInternal, false, \
982 "Call loadClassInternal() rather than loadClass()") \
983 \
984 product_pd(bool, DontYieldALot, \
985 "Throw away obvious excess yield calls (for SOLARIS only)") \
986 \
987 product_pd(bool, ConvertSleepToYield, \
988 "Converts sleep(0) to thread yield " \
989 "(may be off for SOLARIS to improve GUI)") \
990 \
991 product(bool, ConvertYieldToSleep, false, \
992 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
993 "behavior (SOLARIS only)") \
994 \
995 product(bool, UseBoundThreads, true, \
996 "Bind user level threads to kernel threads (for SOLARIS only)") \
997 \
998 develop(bool, UseDetachedThreads, true, \
999 "Use detached threads that are recycled upon termination " \
1000 "(for SOLARIS only)") \
1001 \
1002 product(bool, UseLWPSynchronization, true, \
1003 "Use LWP-based instead of libthread-based synchronization " \
1004 "(SPARC only)") \
1005 \
1006 product(ccstr, SyncKnobs, NULL, \
1007 "(Unstable) Various monitor synchronization tunables") \
1008 \
1009 product(intx, EmitSync, 0, \
1010 "(Unsafe,Unstable) " \
1011 " Controls emission of inline sync fast-path code") \
1012 \
1013 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
1014 \
1015 product(intx, MonitorBound, 0, "Bound Monitor population") \
1016 \
1017 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1018 \
1019 product(intx, Atomics, 0, \
1020 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
1021 \
1022 product(intx, FenceInstruction, 0, \
1023 "(Unsafe,Unstable) Experimental") \
1024 \
1025 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1026 \
1027 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1028 \
1029 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1030 \
1031 product(intx, hashCode, 0, \
1032 "(Unstable) select hashCode generation algorithm" ) \
1033 \
1034 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1035 "(Unstable, Linux-specific)" \
1036 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1037 \
1038 product(bool, FilterSpuriousWakeups, true, \
1039 "Prevent spurious or premature wakeups from object.wait " \
1040 "(Solaris only)") \
1041 \
1042 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1043 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1044 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1045 \
1046 develop(bool, UsePthreads, false, \
1047 "Use pthread-based instead of libthread-based synchronization " \
1048 "(SPARC only)") \
1049 \
1050 product(bool, AdjustConcurrency, false, \
1051 "call thr_setconcurrency at thread create time to avoid " \
1052 "LWP starvation on MP systems (For Solaris Only)") \
1053 \
1054 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
1055 "Should the system attempt to update the compiler file when " \
1056 "an error occurs?") \
1057 \
1058 product(bool, ReduceSignalUsage, false, \
1059 "Reduce the use of OS signals in Java and/or the VM") \
1060 \
1061 notproduct(bool, ValidateMarkSweep, false, \
1062 "Do extra validation during MarkSweep collection") \
1063 \
1064 notproduct(bool, RecordMarkSweepCompaction, false, \
1065 "Enable GC-to-GC recording and querying of compaction during " \
1066 "MarkSweep") \
1067 \
1068 develop_pd(bool, ShareVtableStubs, \
1069 "Share vtable stubs (smaller code but worse branch prediction") \
1070 \
1071 develop(bool, LoadLineNumberTables, true, \
1072 "Tells whether the class file parser loads line number tables") \
1073 \
1074 develop(bool, LoadLocalVariableTables, true, \
1075 "Tells whether the class file parser loads local variable tables")\
1076 \
1077 develop(bool, LoadLocalVariableTypeTables, true, \
1078 "Tells whether the class file parser loads local variable type tables")\
1079 \
1080 product(bool, AllowUserSignalHandlers, false, \
1081 "Do not complain if the application installs signal handlers " \
1082 "(Solaris & Linux only)") \
1083 \
1084 product(bool, UseSignalChaining, true, \
1085 "Use signal-chaining to invoke signal handlers installed " \
1086 "by the application (Solaris & Linux only)") \
1087 \
1088 product(bool, UseAltSigs, false, \
1089 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1090 "internal signals (Solaris only)") \
1091 \
1092 product(bool, UseSpinning, false, \
1093 "Use spinning in monitor inflation and before entry") \
1094 \
1095 product(bool, PreSpinYield, false, \
1096 "Yield before inner spinning loop") \
1097 \
1098 product(bool, PostSpinYield, true, \
1099 "Yield after inner spinning loop") \
1100 \
1101 product(bool, AllowJNIEnvProxy, false, \
1102 "Allow JNIEnv proxies for jdbx") \
1103 \
1104 product(bool, JNIDetachReleasesMonitors, true, \
1105 "JNI DetachCurrentThread releases monitors owned by thread") \
1106 \
1107 product(bool, RestoreMXCSROnJNICalls, false, \
1108 "Restore MXCSR when returning from JNI calls") \
1109 \
1110 product(bool, CheckJNICalls, false, \
1111 "Verify all arguments to JNI calls") \
1112 \
1113 product(bool, UseFastJNIAccessors, true, \
1114 "Use optimized versions of Get<Primitive>Field") \
1115 \
1116 product(bool, EagerXrunInit, false, \
1117 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1118 " but not all -Xrun libraries may support the state of the VM at this time") \
1119 \
1120 product(bool, PreserveAllAnnotations, false, \
1121 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1122 \
1123 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1124 "Number of OutOfMemoryErrors preallocated with backtrace") \
1125 \
1126 product(bool, LazyBootClassLoader, true, \
1127 "Enable/disable lazy opening of boot class path entries") \
1128 \
1129 diagnostic(bool, UseIncDec, true, \
1130 "Use INC, DEC instructions on x86") \
1131 \
1132 product(bool, UseNewLongLShift, false, \
1133 "Use optimized bitwise shift left") \
1134 \
1135 product(bool, UseStoreImmI16, true, \
1136 "Use store immediate 16-bits value instruction on x86") \
1137 \
1138 product(bool, UseAddressNop, false, \
1139 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1140 \
1141 product(bool, UseXmmLoadAndClearUpper, true, \
1142 "Load low part of XMM register and clear upper part") \
1143 \
1144 product(bool, UseXmmRegToRegMoveAll, false, \
1145 "Copy all XMM register bits when moving value between registers") \
1146 \
1147 product(bool, UseXmmI2D, false, \
1148 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1149 \
1150 product(bool, UseXmmI2F, false, \
1151 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1152 \
1153 product(bool, UseXMMForArrayCopy, false, \
1154 "Use SSE2 MOVQ instruction for Arraycopy") \
1155 \
1156 product(bool, UseUnalignedLoadStores, false, \
1157 "Use SSE2 MOVDQU instruction for Arraycopy") \
1158 \
1159 product(intx, FieldsAllocationStyle, 1, \
1160 "0 - type based with oops first, 1 - with oops last, " \
1161 "2 - oops in super and sub classes are together") \
1162 \
1163 product(bool, CompactFields, true, \
1164 "Allocate nonstatic fields in gaps between previous fields") \
1165 \
1166 notproduct(bool, PrintCompactFieldsSavings, false, \
1167 "Print how many words were saved with CompactFields") \
1168 \
1169 product(bool, UseBiasedLocking, true, \
1170 "Enable biased locking in JVM") \
1171 \
1172 product(intx, BiasedLockingStartupDelay, 4000, \
1173 "Number of milliseconds to wait before enabling biased locking") \
1174 \
1175 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1176 "Print statistics of biased locking in JVM") \
1177 \
1178 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1179 "Threshold of number of revocations per type to try to " \
1180 "rebias all objects in the heap of that type") \
1181 \
1182 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1183 "Threshold of number of revocations per type to permanently " \
1184 "revoke biases of all objects in the heap of that type") \
1185 \
1186 product(intx, BiasedLockingDecayTime, 25000, \
1187 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1188 "type after previous bulk rebias") \
1189 \
1190 /* tracing */ \
1191 \
1192 notproduct(bool, TraceRuntimeCalls, false, \
1193 "Trace run-time calls") \
1194 \
1195 develop(bool, TraceJNICalls, false, \
1196 "Trace JNI calls") \
1197 \
1198 notproduct(bool, TraceJVMCalls, false, \
1199 "Trace JVM calls") \
1200 \
1201 product(ccstr, TraceJVMTI, NULL, \
1202 "Trace flags for JVMTI functions and events") \
1203 \
1204 /* This option can change an EMCP method into an obsolete method. */ \
1205 /* This can affect tests that except specific methods to be EMCP. */ \
1206 /* This option should be used with caution. */ \
1207 product(bool, StressLdcRewrite, false, \
1208 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1209 \
1210 product(intx, TraceRedefineClasses, 0, \
1211 "Trace level for JVMTI RedefineClasses") \
1212 \
1213 develop(bool, StressMethodComparator, false, \
1214 "run the MethodComparator on all loaded methods") \
1215 \
1216 /* change to false by default sometime after Mustang */ \
1217 product(bool, VerifyMergedCPBytecodes, true, \
1218 "Verify bytecodes after RedefineClasses constant pool merging") \
1219 \
1220 develop(bool, TraceJNIHandleAllocation, false, \
1221 "Trace allocation/deallocation of JNI handle blocks") \
1222 \
1223 develop(bool, TraceThreadEvents, false, \
1224 "Trace all thread events") \
1225 \
1226 develop(bool, TraceBytecodes, false, \
1227 "Trace bytecode execution") \
1228 \
1229 develop(bool, TraceClassInitialization, false, \
1230 "Trace class initialization") \
1231 \
1232 develop(bool, TraceExceptions, false, \
1233 "Trace exceptions") \
1234 \
1235 develop(bool, TraceICs, false, \
1236 "Trace inline cache changes") \
1237 \
1238 notproduct(bool, TraceInvocationCounterOverflow, false, \
1239 "Trace method invocation counter overflow") \
1240 \
1241 develop(bool, TraceInlineCacheClearing, false, \
1242 "Trace clearing of inline caches in nmethods") \
1243 \
1244 develop(bool, TraceDependencies, false, \
1245 "Trace dependencies") \
1246 \
1247 develop(bool, VerifyDependencies, trueInDebug, \
1248 "Exercise and verify the compilation dependency mechanism") \
1249 \
1250 develop(bool, TraceNewOopMapGeneration, false, \
1251 "Trace OopMapGeneration") \
1252 \
1253 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1254 "Trace OopMapGeneration: print detailed cell states") \
1255 \
1256 develop(bool, TimeOopMap, false, \
1257 "Time calls to GenerateOopMap::compute_map() in sum") \
1258 \
1259 develop(bool, TimeOopMap2, false, \
1260 "Time calls to GenerateOopMap::compute_map() individually") \
1261 \
1262 develop(bool, TraceMonitorMismatch, false, \
1263 "Trace monitor matching failures during OopMapGeneration") \
1264 \
1265 develop(bool, TraceOopMapRewrites, false, \
1266 "Trace rewritting of method oops during oop map generation") \
1267 \
1268 develop(bool, TraceSafepoint, false, \
1269 "Trace safepoint operations") \
1270 \
1271 develop(bool, TraceICBuffer, false, \
1272 "Trace usage of IC buffer") \
1273 \
1274 develop(bool, TraceCompiledIC, false, \
1275 "Trace changes of compiled IC") \
1276 \
1277 notproduct(bool, TraceZapDeadLocals, false, \
1278 "Trace zapping dead locals") \
1279 \
1280 develop(bool, TraceStartupTime, false, \
1281 "Trace setup time") \
1282 \
1283 product(ccstr, HPILibPath, NULL, \
1284 "Specify alternate path to HPI library") \
1285 \
1286 develop(bool, TraceProtectionDomainVerification, false, \
1287 "Trace protection domain verifcation") \
1288 \
1289 develop(bool, TraceClearedExceptions, false, \
1290 "Prints when an exception is forcibly cleared") \
1291 \
1292 product(bool, TraceClassResolution, false, \
1293 "Trace all constant pool resolutions (for debugging)") \
1294 \
1295 product(bool, TraceBiasedLocking, false, \
1296 "Trace biased locking in JVM") \
1297 \
1298 product(bool, TraceMonitorInflation, false, \
1299 "Trace monitor inflation in JVM") \
1300 \
1301 /* assembler */ \
1302 product(bool, Use486InstrsOnly, false, \
1303 "Use 80486 Compliant instruction subset") \
1304 \
1305 /* gc */ \
1306 \
1307 product(bool, UseSerialGC, false, \
1308 "Use the serial garbage collector") \
1309 \
1310 product(bool, UseG1GC, false, \
1311 "Use the Garbage-First garbage collector") \
1312 \
1313 product(bool, UseParallelGC, false, \
1314 "Use the Parallel Scavenge garbage collector") \
1315 \
1316 product(bool, UseParallelOldGC, false, \
1317 "Use the Parallel Old garbage collector") \
1318 \
1319 product(bool, UseParallelOldGCCompacting, true, \
1320 "In the Parallel Old garbage collector use parallel compaction") \
1321 \
1322 product(bool, UseParallelDensePrefixUpdate, true, \
1323 "In the Parallel Old garbage collector use parallel dense" \
1324 " prefix update") \
1325 \
1326 product(uintx, HeapMaximumCompactionInterval, 20, \
1327 "How often should we maximally compact the heap (not allowing " \
1328 "any dead space)") \
1329 \
1330 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1331 "The collection count for the first maximum compaction") \
1332 \
1333 product(bool, UseMaximumCompactionOnSystemGC, true, \
1334 "In the Parallel Old garbage collector maximum compaction for " \
1335 "a system GC") \
1336 \
1337 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1338 "The mean used by the par compact dead wood" \
1339 "limiter (a number between 0-100).") \
1340 \
1341 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1342 "The standard deviation used by the par compact dead wood" \
1343 "limiter (a number between 0-100).") \
1344 \
1345 product(bool, UseParallelOldGCDensePrefix, true, \
1346 "Use a dense prefix with the Parallel Old garbage collector") \
1347 \
1348 product(uintx, ParallelGCThreads, 0, \
1349 "Number of parallel threads parallel gc will use") \
1350 \
1351 develop(bool, ParallelOldGCSplitALot, false, \
1352 "Provoke splitting (copying data from a young gen space to" \
1353 "multiple destination spaces)") \
1354 \
1355 develop(uintx, ParallelOldGCSplitInterval, 3, \
1356 "How often to provoke splitting a young gen space") \
1357 \
1358 develop(bool, TraceRegionTasksQueuing, false, \
1359 "Trace the queuing of the region tasks") \
1360 \
1361 product(uintx, ConcGCThreads, 0, \
1362 "Number of threads concurrent gc will use") \
1363 \
1364 product(uintx, YoungPLABSize, 4096, \
1365 "Size of young gen promotion labs (in HeapWords)") \
1366 \
1367 product(uintx, OldPLABSize, 1024, \
1368 "Size of old gen promotion labs (in HeapWords)") \
1369 \
1370 product(uintx, GCTaskTimeStampEntries, 200, \
1371 "Number of time stamp entries per gc worker thread") \
1372 \
1373 product(bool, AlwaysTenure, false, \
1374 "Always tenure objects in eden. (ParallelGC only)") \
1375 \
1376 product(bool, NeverTenure, false, \
1377 "Never tenure objects in eden, May tenure on overflow " \
1378 "(ParallelGC only)") \
1379 \
1380 product(bool, ScavengeBeforeFullGC, true, \
1381 "Scavenge youngest generation before each full GC, " \
1382 "used with UseParallelGC") \
1383 \
1384 develop(bool, ScavengeWithObjectsInToSpace, false, \
1385 "Allow scavenges to occur when to_space contains objects.") \
1386 \
1387 product(bool, UseConcMarkSweepGC, false, \
1388 "Use Concurrent Mark-Sweep GC in the old generation") \
1389 \
1390 product(bool, ExplicitGCInvokesConcurrent, false, \
1391 "A System.gc() request invokes a concurrent collection;" \
1392 " (effective only when UseConcMarkSweepGC)") \
1393 \
1394 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1395 "A System.gc() request invokes a concurrent collection and " \
1396 "also unloads classes during such a concurrent gc cycle " \
1397 "(effective only when UseConcMarkSweepGC)") \
1398 \
1399 product(bool, GCLockerInvokesConcurrent, false, \
1400 "The exit of a JNI CS necessitating a scavenge also" \
1401 " kicks off a bkgrd concurrent collection") \
1402 \
1403 product(uintx, GCLockerEdenExpansionPercent, 5, \
1404 "How much the GC can expand the eden by while the GC locker " \
1405 "is active (as a percentage)") \
1406 \
1407 develop(bool, UseCMSAdaptiveFreeLists, true, \
1408 "Use Adaptive Free Lists in the CMS generation") \
1409 \
1410 develop(bool, UseAsyncConcMarkSweepGC, true, \
1411 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1412 \
1413 develop(bool, RotateCMSCollectionTypes, false, \
1414 "Rotate the CMS collections among concurrent and STW") \
1415 \
1416 product(bool, UseCMSBestFit, true, \
1417 "Use CMS best fit allocation strategy") \
1418 \
1419 product(bool, UseCMSCollectionPassing, true, \
1420 "Use passing of collection from background to foreground") \
1421 \
1422 product(bool, UseParNewGC, false, \
1423 "Use parallel threads in the new generation.") \
1424 \
1425 product(bool, ParallelGCVerbose, false, \
1426 "Verbose output for parallel GC.") \
1427 \
1428 product(intx, ParallelGCBufferWastePct, 10, \
1429 "wasted fraction of parallel allocation buffer.") \
1430 \
1431 product(bool, ParallelGCRetainPLAB, true, \
1432 "Retain parallel allocation buffers across scavenges.") \
1433 \
1434 product(intx, TargetPLABWastePct, 10, \
1435 "target wasted space in last buffer as pct of overall allocation")\
1436 \
1437 product(uintx, PLABWeight, 75, \
1438 "Percentage (0-100) used to weight the current sample when" \
1439 "computing exponentially decaying average for ResizePLAB.") \
1440 \
1441 product(bool, ResizePLAB, true, \
1442 "Dynamically resize (survivor space) promotion labs") \
1443 \
1444 product(bool, PrintPLAB, false, \
1445 "Print (survivor space) promotion labs sizing decisions") \
1446 \
1447 product(intx, ParGCArrayScanChunk, 50, \
1448 "Scan a subset and push remainder, if array is bigger than this") \
1449 \
1450 product(bool, ParGCUseLocalOverflow, false, \
1451 "Instead of a global overflow list, use local overflow stacks") \
1452 \
1453 product(bool, ParGCTrimOverflow, true, \
1454 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1455 \
1456 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1457 "Whether we should simulate work queue overflow in ParNew") \
1458 \
1459 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1460 "An `interval' counter that determines how frequently " \
1461 "we simulate overflow; a smaller number increases frequency") \
1462 \
1463 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1464 "The desired number of objects to claim from the overflow list") \
1465 \
1466 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1467 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1468 "parallel GC.") \
1469 \
1470 product(uintx, OldPLABWeight, 50, \
1471 "Percentage (0-100) used to weight the current sample when" \
1472 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1473 \
1474 product(bool, ResizeOldPLAB, true, \
1475 "Dynamically resize (old gen) promotion labs") \
1476 \
1477 product(bool, PrintOldPLAB, false, \
1478 "Print (old gen) promotion labs sizing decisions") \
1479 \
1480 product(uintx, CMSOldPLABMin, 16, \
1481 "Min size of CMS gen promotion lab caches per worker per blksize")\
1482 \
1483 product(uintx, CMSOldPLABMax, 1024, \
1484 "Max size of CMS gen promotion lab caches per worker per blksize")\
1485 \
1486 product(uintx, CMSOldPLABNumRefills, 4, \
1487 "Nominal number of refills of CMS gen promotion lab cache" \
1488 " per worker per block size") \
1489 \
1490 product(bool, CMSOldPLABResizeQuicker, false, \
1491 "Whether to react on-the-fly during a scavenge to a sudden" \
1492 " change in block demand rate") \
1493 \
1494 product(uintx, CMSOldPLABToleranceFactor, 4, \
1495 "The tolerance of the phase-change detector for on-the-fly" \
1496 " PLAB resizing during a scavenge") \
1497 \
1498 product(uintx, CMSOldPLABReactivityFactor, 2, \
1499 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1500 " during a scavenge") \
1501 \
1502 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1503 "The clamping of the gain in the feedback loop for on-the-fly" \
1504 " PLAB resizing during a scavenge") \
1505 \
1506 product(bool, AlwaysPreTouch, false, \
1507 "It forces all freshly committed pages to be pre-touched.") \
1508 \
1509 product(bool, CMSUseOldDefaults, false, \
1510 "A flag temporarily introduced to allow reverting to some " \
1511 "older default settings; older as of 6.0") \
1512 \
1513 product(intx, CMSYoungGenPerWorker, 16*M, \
1514 "The amount of young gen chosen by default per GC worker " \
1515 "thread available") \
1516 \
1517 product(bool, GCOverheadReporting, false, \
1518 "Enables the GC overhead reporting facility") \
1519 \
1520 product(intx, GCOverheadReportingPeriodMS, 100, \
1521 "Reporting period for conc GC overhead reporting, in ms ") \
1522 \
1523 product(bool, CMSIncrementalMode, false, \
1524 "Whether CMS GC should operate in \"incremental\" mode") \
1525 \
1526 product(uintx, CMSIncrementalDutyCycle, 10, \
1527 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1528 "CMSIncrementalPacing is enabled, then this is just the initial" \
1529 "value") \
1530 \
1531 product(bool, CMSIncrementalPacing, true, \
1532 "Whether the CMS incremental mode duty cycle should be " \
1533 "automatically adjusted") \
1534 \
1535 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1536 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1537 "enabled (a percentage, 0-100)") \
1538 \
1539 product(uintx, CMSIncrementalSafetyFactor, 10, \
1540 "Percentage (0-100) used to add conservatism when computing the " \
1541 "duty cycle") \
1542 \
1543 product(uintx, CMSIncrementalOffset, 0, \
1544 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1545 " is shifted to the right within the period between young GCs") \
1546 \
1547 product(uintx, CMSExpAvgFactor, 50, \
1548 "Percentage (0-100) used to weight the current sample when" \
1549 "computing exponential averages for CMS statistics.") \
1550 \
1551 product(uintx, CMS_FLSWeight, 75, \
1552 "Percentage (0-100) used to weight the current sample when" \
1553 "computing exponentially decating averages for CMS FLS statistics.") \
1554 \
1555 product(uintx, CMS_FLSPadding, 1, \
1556 "The multiple of deviation from mean to use for buffering" \
1557 "against volatility in free list demand.") \
1558 \
1559 product(uintx, FLSCoalescePolicy, 2, \
1560 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1561 \
1562 product(bool, FLSAlwaysCoalesceLarge, false, \
1563 "CMS: Larger free blocks are always available for coalescing") \
1564 \
1565 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1566 "CMS: the smaller the percentage the greater the coalition force")\
1567 \
1568 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1569 "CMS: the factor by which to inflate estimated demand of small" \
1570 " block sizes to prevent coalescing with an adjoining block") \
1571 \
1572 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1573 "CMS: the factor by which to inflate estimated demand of large" \
1574 " block sizes to prevent coalescing with an adjoining block") \
1575 \
1576 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1577 "CMS: the factor by which to inflate estimated demand of small" \
1578 " block sizes to prevent splitting to supply demand for smaller" \
1579 " blocks") \
1580 \
1581 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1582 "CMS: the factor by which to inflate estimated demand of large" \
1583 " block sizes to prevent splitting to supply demand for smaller" \
1584 " blocks") \
1585 \
1586 product(bool, CMSExtrapolateSweep, false, \
1587 "CMS: cushion for block demand during sweep") \
1588 \
1589 product(uintx, CMS_SweepWeight, 75, \
1590 "Percentage (0-100) used to weight the current sample when " \
1591 "computing exponentially decaying average for inter-sweep " \
1592 "duration") \
1593 \
1594 product(uintx, CMS_SweepPadding, 1, \
1595 "The multiple of deviation from mean to use for buffering " \
1596 "against volatility in inter-sweep duration.") \
1597 \
1598 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1599 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1600 "duration exceeds this threhold in milliseconds") \
1601 \
1602 develop(bool, CMSTraceIncrementalMode, false, \
1603 "Trace CMS incremental mode") \
1604 \
1605 develop(bool, CMSTraceIncrementalPacing, false, \
1606 "Trace CMS incremental mode pacing computation") \
1607 \
1608 develop(bool, CMSTraceThreadState, false, \
1609 "Trace the CMS thread state (enable the trace_state() method)") \
1610 \
1611 product(bool, CMSClassUnloadingEnabled, false, \
1612 "Whether class unloading enabled when using CMS GC") \
1613 \
1614 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1615 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1616 " for which classes may not be unloaded") \
1617 \
1618 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1619 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1620 \
1621 product(bool, UseCMSCompactAtFullCollection, true, \
1622 "Use mark sweep compact at full collections") \
1623 \
1624 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1625 "Number of CMS full collection done before compaction if > 0") \
1626 \
1627 develop(intx, CMSDictionaryChoice, 0, \
1628 "Use BinaryTreeDictionary as default in the CMS generation") \
1629 \
1630 product(uintx, CMSIndexedFreeListReplenish, 4, \
1631 "Replenish an indexed free list with this number of chunks") \
1632 \
1633 product(bool, CMSReplenishIntermediate, true, \
1634 "Replenish all intermediate free-list caches") \
1635 \
1636 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1637 "When satisfying batched demand, split blocks from the " \
1638 "IndexedFreeList whose size is a multiple of requested size") \
1639 \
1640 product(bool, CMSLoopWarn, false, \
1641 "Warn in case of excessive CMS looping") \
1642 \
1643 develop(bool, CMSOverflowEarlyRestoration, false, \
1644 "Whether preserved marks should be restored early") \
1645 \
1646 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1647 "Size of marking stack") \
1648 \
1649 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1650 "Max size of marking stack") \
1651 \
1652 notproduct(bool, CMSMarkStackOverflowALot, false, \
1653 "Whether we should simulate frequent marking stack / work queue" \
1654 " overflow") \
1655 \
1656 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1657 "An `interval' counter that determines how frequently" \
1658 " we simulate overflow; a smaller number increases frequency") \
1659 \
1660 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1661 "(Temporary, subject to experimentation)" \
1662 "Maximum number of abortable preclean iterations, if > 0") \
1663 \
1664 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1665 "(Temporary, subject to experimentation)" \
1666 "Maximum time in abortable preclean in ms") \
1667 \
1668 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1669 "(Temporary, subject to experimentation)" \
1670 "Nominal minimum work per abortable preclean iteration") \
1671 \
1672 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1673 "(Temporary, subject to experimentation)" \
1674 " Time that we sleep between iterations when not given" \
1675 " enough work per iteration") \
1676 \
1677 product(uintx, CMSRescanMultiple, 32, \
1678 "Size (in cards) of CMS parallel rescan task") \
1679 \
1680 product(uintx, CMSConcMarkMultiple, 32, \
1681 "Size (in cards) of CMS concurrent MT marking task") \
1682 \
1683 product(uintx, CMSRevisitStackSize, 1*M, \
1684 "Size of CMS KlassKlass revisit stack") \
1685 \
1686 product(bool, CMSAbortSemantics, false, \
1687 "Whether abort-on-overflow semantics is implemented") \
1688 \
1689 product(bool, CMSParallelRemarkEnabled, true, \
1690 "Whether parallel remark enabled (only if ParNewGC)") \
1691 \
1692 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1693 "Whether parallel remark of survivor space" \
1694 " enabled (effective only if CMSParallelRemarkEnabled)") \
1695 \
1696 product(bool, CMSPLABRecordAlways, true, \
1697 "Whether to always record survivor space PLAB bdries" \
1698 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1699 \
1700 product(bool, CMSConcurrentMTEnabled, true, \
1701 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1702 \
1703 product(bool, CMSPermGenPrecleaningEnabled, true, \
1704 "Whether concurrent precleaning enabled in perm gen" \
1705 " (effective only when CMSPrecleaningEnabled is true)") \
1706 \
1707 product(bool, CMSPrecleaningEnabled, true, \
1708 "Whether concurrent precleaning enabled") \
1709 \
1710 product(uintx, CMSPrecleanIter, 3, \
1711 "Maximum number of precleaning iteration passes") \
1712 \
1713 product(uintx, CMSPrecleanNumerator, 2, \
1714 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1715 " ratio") \
1716 \
1717 product(uintx, CMSPrecleanDenominator, 3, \
1718 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1719 " ratio") \
1720 \
1721 product(bool, CMSPrecleanRefLists1, true, \
1722 "Preclean ref lists during (initial) preclean phase") \
1723 \
1724 product(bool, CMSPrecleanRefLists2, false, \
1725 "Preclean ref lists during abortable preclean phase") \
1726 \
1727 product(bool, CMSPrecleanSurvivors1, false, \
1728 "Preclean survivors during (initial) preclean phase") \
1729 \
1730 product(bool, CMSPrecleanSurvivors2, true, \
1731 "Preclean survivors during abortable preclean phase") \
1732 \
1733 product(uintx, CMSPrecleanThreshold, 1000, \
1734 "Don't re-iterate if #dirty cards less than this") \
1735 \
1736 product(bool, CMSCleanOnEnter, true, \
1737 "Clean-on-enter optimization for reducing number of dirty cards") \
1738 \
1739 product(uintx, CMSRemarkVerifyVariant, 1, \
1740 "Choose variant (1,2) of verification following remark") \
1741 \
1742 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1743 "If Eden used is below this value, don't try to schedule remark") \
1744 \
1745 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1746 "The Eden occupancy % at which to try and schedule remark pause") \
1747 \
1748 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1749 "Start sampling Eden top at least before yg occupancy reaches" \
1750 " 1/<ratio> of the size at which we plan to schedule remark") \
1751 \
1752 product(uintx, CMSSamplingGrain, 16*K, \
1753 "The minimum distance between eden samples for CMS (see above)") \
1754 \
1755 product(bool, CMSScavengeBeforeRemark, false, \
1756 "Attempt scavenge before the CMS remark step") \
1757 \
1758 develop(bool, CMSTraceSweeper, false, \
1759 "Trace some actions of the CMS sweeper") \
1760 \
1761 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1762 "Don't drain below this size per parallel worker/thief") \
1763 \
1764 manageable(intx, CMSWaitDuration, 2000, \
1765 "Time in milliseconds that CMS thread waits for young GC") \
1766 \
1767 product(bool, CMSYield, true, \
1768 "Yield between steps of concurrent mark & sweep") \
1769 \
1770 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1771 "Bitmap operations should process at most this many bits" \
1772 "between yields") \
1773 \
1774 product(bool, CMSDumpAtPromotionFailure, false, \
1775 "Dump useful information about the state of the CMS old " \
1776 " generation upon a promotion failure.") \
1777 \
1778 product(bool, CMSPrintChunksInDump, false, \
1779 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1780 " more detailed information about the free chunks.") \
1781 \
1782 product(bool, CMSPrintObjectsInDump, false, \
1783 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1784 " more detailed information about the allocated objects.") \
1785 \
1786 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1787 "Verify that all refs across the FLS boundary " \
1788 " are to valid objects") \
1789 \
1790 diagnostic(bool, FLSVerifyLists, false, \
1791 "Do lots of (expensive) FreeListSpace verification") \
1792 \
1793 diagnostic(bool, FLSVerifyIndexTable, false, \
1794 "Do lots of (expensive) FLS index table verification") \
1795 \
1796 develop(bool, FLSVerifyDictionary, false, \
1797 "Do lots of (expensive) FLS dictionary verification") \
1798 \
1799 develop(bool, VerifyBlockOffsetArray, false, \
1800 "Do (expensive!) block offset array verification") \
1801 \
1802 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1803 "Maintain _unallocated_block in BlockOffsetArray" \
1804 " (currently applicable only to CMS collector)") \
1805 \
1806 develop(bool, TraceCMSState, false, \
1807 "Trace the state of the CMS collection") \
1808 \
1809 product(intx, RefDiscoveryPolicy, 0, \
1810 "Whether reference-based(0) or referent-based(1)") \
1811 \
1812 product(bool, ParallelRefProcEnabled, false, \
1813 "Enable parallel reference processing whenever possible") \
1814 \
1815 product(bool, ParallelRefProcBalancingEnabled, true, \
1816 "Enable balancing of reference processing queues") \
1817 \
1818 product(intx, CMSTriggerRatio, 80, \
1819 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1820 "allocated before a CMS collection cycle commences") \
1821 \
1822 product(intx, CMSTriggerPermRatio, 80, \
1823 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1824 "is allocated before a CMS collection cycle commences, that " \
1825 "also collects the perm generation") \
1826 \
1827 product(uintx, CMSBootstrapOccupancy, 50, \
1828 "Percentage CMS generation occupancy at which to " \
1829 "initiate CMS collection for bootstrapping collection stats") \
1830 \
1831 product(intx, CMSInitiatingOccupancyFraction, -1, \
1832 "Percentage CMS generation occupancy to start a CMS collection " \
1833 "cycle. A negative value means that CMSTriggerRatio is used") \
1834 \
1835 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1836 "Percentage of the (entire) heap occupancy to start a " \
1837 "concurrent GC cycle. It us used by GCs that trigger a " \
1838 "concurrent GC cycle based on the occupancy of the entire heap, " \
1839 "not just one of the generations (e.g., G1). A value of 0 " \
1840 "denotes 'do constant GC cycles'.") \
1841 \
1842 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1843 "Percentage CMS perm generation occupancy to start a " \
1844 "CMScollection cycle. A negative value means that " \
1845 "CMSTriggerPermRatio is used") \
1846 \
1847 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1848 "Only use occupancy as a crierion for starting a CMS collection") \
1849 \
1850 product(intx, CMSIsTooFullPercentage, 98, \
1851 "An absolute ceiling above which CMS will always consider the " \
1852 "perm gen ripe for collection") \
1853 \
1854 develop(bool, CMSTestInFreeList, false, \
1855 "Check if the coalesced range is already in the " \
1856 "free lists as claimed") \
1857 \
1858 notproduct(bool, CMSVerifyReturnedBytes, false, \
1859 "Check that all the garbage collected was returned to the " \
1860 "free lists.") \
1861 \
1862 notproduct(bool, ScavengeALot, false, \
1863 "Force scavenge at every Nth exit from the runtime system " \
1864 "(N=ScavengeALotInterval)") \
1865 \
1866 develop(bool, FullGCALot, false, \
1867 "Force full gc at every Nth exit from the runtime system " \
1868 "(N=FullGCALotInterval)") \
1869 \
1870 notproduct(bool, GCALotAtAllSafepoints, false, \
1871 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1872 \
1873 product(bool, PrintPromotionFailure, false, \
1874 "Print additional diagnostic information following " \
1875 " promotion failure") \
1876 \
1877 notproduct(bool, PromotionFailureALot, false, \
1878 "Use promotion failure handling on every youngest generation " \
1879 "collection") \
1880 \
1881 develop(uintx, PromotionFailureALotCount, 1000, \
1882 "Number of promotion failures occurring at ParGCAllocBuffer" \
1883 "refill attempts (ParNew) or promotion attempts " \
1884 "(other young collectors) ") \
1885 \
1886 develop(uintx, PromotionFailureALotInterval, 5, \
1887 "Total collections between promotion failures alot") \
1888 \
1889 experimental(intx, WorkStealingSleepMillis, 1, \
1890 "Sleep time when sleep is used for yields") \
1891 \
1892 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1893 "Number of yields before a sleep is done during workstealing") \
1894 \
1895 experimental(uintx, WorkStealingHardSpins, 4096, \
1896 "Number of iterations in a spin loop between checks on " \
1897 "time out of hard spin") \
1898 \
1899 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1900 "Ratio of hard spins to calls to yield") \
1901 \
1902 product(uintx, PreserveMarkStackSize, 1024, \
1903 "Size for stack used in promotion failure handling") \
1904 \
1905 develop(uintx, ObjArrayMarkingStride, 512, \
1906 "Number of ObjArray elements to push onto the marking stack" \
1907 "before pushing a continuation entry") \
1908 \
1909 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1910 \
1911 product_pd(bool, ResizeTLAB, \
1912 "Dynamically resize tlab size for threads") \
1913 \
1914 product(bool, ZeroTLAB, false, \
1915 "Zero out the newly created TLAB") \
1916 \
1917 product(bool, FastTLABRefill, true, \
1918 "Use fast TLAB refill code") \
1919 \
1920 product(bool, PrintTLAB, false, \
1921 "Print various TLAB related information") \
1922 \
1923 product(bool, TLABStats, true, \
1924 "Print various TLAB related information") \
1925 \
1926 product(bool, PrintRevisitStats, false, \
1927 "Print revisit (klass and MDO) stack related information") \
1928 \
1929 product_pd(bool, NeverActAsServerClassMachine, \
1930 "Never act like a server-class machine") \
1931 \
1932 product(bool, AlwaysActAsServerClassMachine, false, \
1933 "Always act like a server-class machine") \
1934 \
1935 product_pd(uint64_t, MaxRAM, \
1936 "Real memory size (in bytes) used to set maximum heap size") \
1937 \
1938 product(uintx, ErgoHeapSizeLimit, 0, \
1939 "Maximum ergonomically set heap size (in bytes); zero means use " \
1940 "MaxRAM / MaxRAMFraction") \
1941 \
1942 product(uintx, MaxRAMFraction, 4, \
1943 "Maximum fraction (1/n) of real memory used for maximum heap " \
1944 "size") \
1945 \
1946 product(uintx, DefaultMaxRAMFraction, 4, \
1947 "Maximum fraction (1/n) of real memory used for maximum heap " \
1948 "size; deprecated: to be renamed to MaxRAMFraction") \
1949 \
1950 product(uintx, MinRAMFraction, 2, \
1951 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1952 "size on systems with small physical memory size") \
1953 \
1954 product(uintx, InitialRAMFraction, 64, \
1955 "Fraction (1/n) of real memory used for initial heap size") \
1956 \
1957 product(bool, UseAutoGCSelectPolicy, false, \
1958 "Use automatic collection selection policy") \
1959 \
1960 product(uintx, AutoGCSelectPauseMillis, 5000, \
1961 "Automatic GC selection pause threshhold in ms") \
1962 \
1963 product(bool, UseAdaptiveSizePolicy, true, \
1964 "Use adaptive generation sizing policies") \
1965 \
1966 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1967 "Use adaptive survivor sizing policies") \
1968 \
1969 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1970 "Use adaptive young-old sizing policies at minor collections") \
1971 \
1972 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1973 "Use adaptive young-old sizing policies at major collections") \
1974 \
1975 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1976 "Use statistics from System.GC for adaptive size policy") \
1977 \
1978 product(bool, UseAdaptiveGCBoundary, false, \
1979 "Allow young-old boundary to move") \
1980 \
1981 develop(bool, TraceAdaptiveGCBoundary, false, \
1982 "Trace young-old boundary moves") \
1983 \
1984 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
1985 "Resize the virtual spaces of the young or old generations") \
1986 \
1987 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
1988 "Policy for changeing generation size for throughput goals") \
1989 \
1990 product(uintx, AdaptiveSizePausePolicy, 0, \
1991 "Policy for changing generation size for pause goals") \
1992 \
1993 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
1994 "Adjust tenured generation to achive a minor pause goal") \
1995 \
1996 develop(bool, PSAdjustYoungGenForMajorPause, false, \
1997 "Adjust young generation to achive a major pause goal") \
1998 \
1999 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2000 "Number of steps where heuristics is used before data is used") \
2001 \
2002 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2003 "Number of collections before the adaptive sizing is started") \
2004 \
2005 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2006 "Collecton interval for printing information; zero => never") \
2007 \
2008 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2009 "Use adaptive minimum footprint as a goal") \
2010 \
2011 product(uintx, AdaptiveSizePolicyWeight, 10, \
2012 "Weight given to exponential resizing, between 0 and 100") \
2013 \
2014 product(uintx, AdaptiveTimeWeight, 25, \
2015 "Weight given to time in adaptive policy, between 0 and 100") \
2016 \
2017 product(uintx, PausePadding, 1, \
2018 "How much buffer to keep for pause time") \
2019 \
2020 product(uintx, PromotedPadding, 3, \
2021 "How much buffer to keep for promotion failure") \
2022 \
2023 product(uintx, SurvivorPadding, 3, \
2024 "How much buffer to keep for survivor overflow") \
2025 \
2026 product(uintx, AdaptivePermSizeWeight, 20, \
2027 "Weight for perm gen exponential resizing, between 0 and 100") \
2028 \
2029 product(uintx, PermGenPadding, 3, \
2030 "How much buffer to keep for perm gen sizing") \
2031 \
2032 product(uintx, ThresholdTolerance, 10, \
2033 "Allowed collection cost difference between generations") \
2034 \
2035 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2036 "If collection costs are within margin, reduce both by full " \
2037 "delta") \
2038 \
2039 product(uintx, YoungGenerationSizeIncrement, 20, \
2040 "Adaptive size percentage change in young generation") \
2041 \
2042 product(uintx, YoungGenerationSizeSupplement, 80, \
2043 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2044 \
2045 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2046 "Decay factor to YoungedGenerationSizeSupplement") \
2047 \
2048 product(uintx, TenuredGenerationSizeIncrement, 20, \
2049 "Adaptive size percentage change in tenured generation") \
2050 \
2051 product(uintx, TenuredGenerationSizeSupplement, 80, \
2052 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2053 \
2054 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2055 "Decay factor to TenuredGenerationSizeIncrement") \
2056 \
2057 product(uintx, MaxGCPauseMillis, max_uintx, \
2058 "Adaptive size policy maximum GC pause time goal in msec, " \
2059 "or (G1 Only) the max. GC time per MMU time slice") \
2060 \
2061 product(uintx, GCPauseIntervalMillis, 0, \
2062 "Time slice for MMU specification") \
2063 \
2064 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2065 "Adaptive size policy maximum GC minor pause time goal in msec") \
2066 \
2067 product(uintx, GCTimeRatio, 99, \
2068 "Adaptive size policy application time to GC time ratio") \
2069 \
2070 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2071 "Adaptive size scale down factor for shrinking") \
2072 \
2073 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2074 "Adaptive size decays the major cost for long major intervals") \
2075 \
2076 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2077 "Time scale over which major costs decay") \
2078 \
2079 product(uintx, MinSurvivorRatio, 3, \
2080 "Minimum ratio of young generation/survivor space size") \
2081 \
2082 product(uintx, InitialSurvivorRatio, 8, \
2083 "Initial ratio of eden/survivor space size") \
2084 \
2085 product(uintx, BaseFootPrintEstimate, 256*M, \
2086 "Estimate of footprint other than Java Heap") \
2087 \
2088 product(bool, UseGCOverheadLimit, true, \
2089 "Use policy to limit of proportion of time spent in GC " \
2090 "before an OutOfMemory error is thrown") \
2091 \
2092 product(uintx, GCTimeLimit, 98, \
2093 "Limit of proportion of time spent in GC before an OutOfMemory" \
2094 "error is thrown (used with GCHeapFreeLimit)") \
2095 \
2096 product(uintx, GCHeapFreeLimit, 2, \
2097 "Minimum percentage of free space after a full GC before an " \
2098 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2099 \
2100 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2101 "Number of consecutive collections before gc time limit fires") \
2102 \
2103 product(bool, PrintAdaptiveSizePolicy, false, \
2104 "Print information about AdaptiveSizePolicy") \
2105 \
2106 product(intx, PrefetchCopyIntervalInBytes, -1, \
2107 "How far ahead to prefetch destination area (<= 0 means off)") \
2108 \
2109 product(intx, PrefetchScanIntervalInBytes, -1, \
2110 "How far ahead to prefetch scan area (<= 0 means off)") \
2111 \
2112 product(intx, PrefetchFieldsAhead, -1, \
2113 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2114 \
2115 develop(bool, UsePrefetchQueue, true, \
2116 "Use the prefetch queue during PS promotion") \
2117 \
2118 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2119 "Verify system before exiting") \
2120 \
2121 diagnostic(bool, VerifyBeforeGC, false, \
2122 "Verify memory system before GC") \
2123 \
2124 diagnostic(bool, VerifyAfterGC, false, \
2125 "Verify memory system after GC") \
2126 \
2127 diagnostic(bool, VerifyDuringGC, false, \
2128 "Verify memory system during GC (between phases)") \
2129 \
2130 diagnostic(bool, GCParallelVerificationEnabled, true, \
2131 "Enable parallel memory system verification") \
2132 \
2133 diagnostic(bool, DeferInitialCardMark, false, \
2134 "When +ReduceInitialCardMarks, explicitly defer any that " \
2135 "may arise from new_pre_store_barrier") \
2136 \
2137 diagnostic(bool, VerifyRememberedSets, false, \
2138 "Verify GC remembered sets") \
2139 \
2140 diagnostic(bool, VerifyObjectStartArray, true, \
2141 "Verify GC object start array if verify before/after") \
2142 \
2143 product(bool, DisableExplicitGC, false, \
2144 "Tells whether calling System.gc() does a full GC") \
2145 \
2146 notproduct(bool, CheckMemoryInitialization, false, \
2147 "Checks memory initialization") \
2148 \
2149 product(bool, CollectGen0First, false, \
2150 "Collect youngest generation before each full GC") \
2151 \
2152 diagnostic(bool, BindCMSThreadToCPU, false, \
2153 "Bind CMS Thread to CPU if possible") \
2154 \
2155 diagnostic(uintx, CPUForCMSThread, 0, \
2156 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2157 \
2158 product(bool, BindGCTaskThreadsToCPUs, false, \
2159 "Bind GCTaskThreads to CPUs if possible") \
2160 \
2161 product(bool, UseGCTaskAffinity, false, \
2162 "Use worker affinity when asking for GCTasks") \
2163 \
2164 product(uintx, ProcessDistributionStride, 4, \
2165 "Stride through processors when distributing processes") \
2166 \
2167 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2168 "number of times the coordinator GC thread will sleep while " \
2169 "yielding before giving up and resuming GC") \
2170 \
2171 product(uintx, CMSYieldSleepCount, 0, \
2172 "number of times a GC thread (minus the coordinator) " \
2173 "will sleep while yielding before giving up and resuming GC") \
2174 \
2175 /* gc tracing */ \
2176 manageable(bool, PrintGC, false, \
2177 "Print message at garbage collect") \
2178 \
2179 manageable(bool, PrintGCDetails, false, \
2180 "Print more details at garbage collect") \
2181 \
2182 manageable(bool, PrintGCDateStamps, false, \
2183 "Print date stamps at garbage collect") \
2184 \
2185 manageable(bool, PrintGCTimeStamps, false, \
2186 "Print timestamps at garbage collect") \
2187 \
2188 product(bool, PrintGCTaskTimeStamps, false, \
2189 "Print timestamps for individual gc worker thread tasks") \
2190 \
2191 develop(intx, ConcGCYieldTimeout, 0, \
2192 "If non-zero, assert that GC threads yield within this # of ms.") \
2193 \
2194 notproduct(bool, TraceMarkSweep, false, \
2195 "Trace mark sweep") \
2196 \
2197 product(bool, PrintReferenceGC, false, \
2198 "Print times spent handling reference objects during GC " \
2199 " (enabled only when PrintGCDetails)") \
2200 \
2201 develop(bool, TraceReferenceGC, false, \
2202 "Trace handling of soft/weak/final/phantom references") \
2203 \
2204 develop(bool, TraceFinalizerRegistration, false, \
2205 "Trace registration of final references") \
2206 \
2207 notproduct(bool, TraceScavenge, false, \
2208 "Trace scavenge") \
2209 \
2210 product_rw(bool, TraceClassLoading, false, \
2211 "Trace all classes loaded") \
2212 \
2213 product(bool, TraceClassLoadingPreorder, false, \
2214 "Trace all classes loaded in order referenced (not loaded)") \
2215 \
2216 product_rw(bool, TraceClassUnloading, false, \
2217 "Trace unloading of classes") \
2218 \
2219 product_rw(bool, TraceLoaderConstraints, false, \
2220 "Trace loader constraints") \
2221 \
2222 product(bool, TraceGen0Time, false, \
2223 "Trace accumulated time for Gen 0 collection") \
2224 \
2225 product(bool, TraceGen1Time, false, \
2226 "Trace accumulated time for Gen 1 collection") \
2227 \
2228 product(bool, PrintTenuringDistribution, false, \
2229 "Print tenuring age information") \
2230 \
2231 product_rw(bool, PrintHeapAtGC, false, \
2232 "Print heap layout before and after each GC") \
2233 \
2234 product_rw(bool, PrintHeapAtGCExtended, false, \
2235 "Prints extended information about the layout of the heap " \
2236 "when -XX:+PrintHeapAtGC is set") \
2237 \
2238 product(bool, PrintHeapAtSIGBREAK, true, \
2239 "Print heap layout in response to SIGBREAK") \
2240 \
2241 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2242 "Print a class histogram before any major stop-world GC") \
2243 \
2244 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2245 "Print a class histogram after any major stop-world GC") \
2246 \
2247 manageable(bool, PrintClassHistogram, false, \
2248 "Print a histogram of class instances") \
2249 \
2250 develop(bool, TraceWorkGang, false, \
2251 "Trace activities of work gangs") \
2252 \
2253 product(bool, TraceParallelOldGCTasks, false, \
2254 "Trace multithreaded GC activity") \
2255 \
2256 develop(bool, TraceBlockOffsetTable, false, \
2257 "Print BlockOffsetTable maps") \
2258 \
2259 develop(bool, TraceCardTableModRefBS, false, \
2260 "Print CardTableModRefBS maps") \
2261 \
2262 develop(bool, TraceGCTaskManager, false, \
2263 "Trace actions of the GC task manager") \
2264 \
2265 develop(bool, TraceGCTaskQueue, false, \
2266 "Trace actions of the GC task queues") \
2267 \
2268 develop(bool, TraceGCTaskThread, false, \
2269 "Trace actions of the GC task threads") \
2270 \
2271 product(bool, PrintParallelOldGCPhaseTimes, false, \
2272 "Print the time taken by each parallel old gc phase." \
2273 "PrintGCDetails must also be enabled.") \
2274 \
2275 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2276 "Trace parallel old gc marking phase") \
2277 \
2278 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2279 "Trace parallel old gc summary phase") \
2280 \
2281 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2282 "Trace parallel old gc compaction phase") \
2283 \
2284 develop(bool, TraceParallelOldGCDensePrefix, false, \
2285 "Trace parallel old gc dense prefix computation") \
2286 \
2287 develop(bool, IgnoreLibthreadGPFault, false, \
2288 "Suppress workaround for libthread GP fault") \
2289 \
2290 product(bool, PrintJNIGCStalls, false, \
2291 "Print diagnostic message when GC is stalled" \
2292 "by JNI critical section") \
2293 \
2294 /* JVMTI heap profiling */ \
2295 \
2296 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2297 "Trace JVMTI object tagging calls") \
2298 \
2299 diagnostic(bool, VerifyBeforeIteration, false, \
2300 "Verify memory system before JVMTI iteration") \
2301 \
2302 /* compiler interface */ \
2303 \
2304 develop(bool, CIPrintCompilerName, false, \
2305 "when CIPrint is active, print the name of the active compiler") \
2306 \
2307 develop(bool, CIPrintCompileQueue, false, \
2308 "display the contents of the compile queue whenever a " \
2309 "compilation is enqueued") \
2310 \
2311 develop(bool, CIPrintRequests, false, \
2312 "display every request for compilation") \
2313 \
2314 product(bool, CITime, false, \
2315 "collect timing information for compilation") \
2316 \
2317 develop(bool, CITimeEach, false, \
2318 "display timing information after each successful compilation") \
2319 \
2320 develop(bool, CICountOSR, true, \
2321 "use a separate counter when assigning ids to osr compilations") \
2322 \
2323 develop(bool, CICompileNatives, true, \
2324 "compile native methods if supported by the compiler") \
2325 \
2326 develop_pd(bool, CICompileOSR, \
2327 "compile on stack replacement methods if supported by the " \
2328 "compiler") \
2329 \
2330 develop(bool, CIPrintMethodCodes, false, \
2331 "print method bytecodes of the compiled code") \
2332 \
2333 develop(bool, CIPrintTypeFlow, false, \
2334 "print the results of ciTypeFlow analysis") \
2335 \
2336 develop(bool, CITraceTypeFlow, false, \
2337 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2338 \
2339 develop(intx, CICloneLoopTestLimit, 100, \
2340 "size limit for blocks heuristically cloned in ciTypeFlow") \
2341 \
2342 /* temp diagnostics */ \
2343 \
2344 diagnostic(bool, TraceRedundantCompiles, false, \
2345 "Have compile broker print when a request already in the queue is"\
2346 " requested again") \
2347 \
2348 diagnostic(bool, InitialCompileFast, false, \
2349 "Initial compile at CompLevel_fast_compile") \
2350 \
2351 diagnostic(bool, InitialCompileReallyFast, false, \
2352 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2353 \
2354 diagnostic(bool, FullProfileOnReInterpret, true, \
2355 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2356 \
2357 /* compiler */ \
2358 \
2359 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2360 "Number of compiler threads to run") \
2361 \
2362 product(intx, CompilationPolicyChoice, 0, \
2363 "which compilation policy (0/1)") \
2364 \
2365 develop(bool, UseStackBanging, true, \
2366 "use stack banging for stack overflow checks (required for " \
2367 "proper StackOverflow handling; disable only to measure cost " \
2368 "of stackbanging)") \
2369 \
2370 develop(bool, Use24BitFPMode, true, \
2371 "Set 24-bit FPU mode on a per-compile basis ") \
2372 \
2373 develop(bool, Use24BitFP, true, \
2374 "use FP instructions that produce 24-bit precise results") \
2375 \
2376 develop(bool, UseStrictFP, true, \
2377 "use strict fp if modifier strictfp is set") \
2378 \
2379 develop(bool, GenerateSynchronizationCode, true, \
2380 "generate locking/unlocking code for synchronized methods and " \
2381 "monitors") \
2382 \
2383 develop(bool, GenerateCompilerNullChecks, true, \
2384 "Generate explicit null checks for loads/stores/calls") \
2385 \
2386 develop(bool, GenerateRangeChecks, true, \
2387 "Generate range checks for array accesses") \
2388 \
2389 develop_pd(bool, ImplicitNullChecks, \
2390 "generate code for implicit null checks") \
2391 \
2392 product(bool, PrintSafepointStatistics, false, \
2393 "print statistics about safepoint synchronization") \
2394 \
2395 product(intx, PrintSafepointStatisticsCount, 300, \
2396 "total number of safepoint statistics collected " \
2397 "before printing them out") \
2398 \
2399 product(intx, PrintSafepointStatisticsTimeout, -1, \
2400 "print safepoint statistics only when safepoint takes" \
2401 " more than PrintSafepointSatisticsTimeout in millis") \
2402 \
2403 product(bool, TraceSafepointCleanupTime, false, \
2404 "print the break down of clean up tasks performed during" \
2405 " safepoint") \
2406 \
2407 develop(bool, InlineAccessors, true, \
2408 "inline accessor methods (get/set)") \
2409 \
2410 product(bool, Inline, true, \
2411 "enable inlining") \
2412 \
2413 product(bool, ClipInlining, true, \
2414 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2415 \
2416 develop(bool, UseCHA, true, \
2417 "enable CHA") \
2418 \
2419 product(bool, UseTypeProfile, true, \
2420 "Check interpreter profile for historically monomorphic calls") \
2421 \
2422 product(intx, TypeProfileMajorReceiverPercent, 90, \
2423 "% of major receiver type to all profiled receivers") \
2424 \
2425 notproduct(bool, TimeCompiler, false, \
2426 "time the compiler") \
2427 \
2428 notproduct(bool, TimeCompiler2, false, \
2429 "detailed time the compiler (requires +TimeCompiler)") \
2430 \
2431 diagnostic(bool, PrintInlining, false, \
2432 "prints inlining optimizations") \
2433 \
2434 diagnostic(bool, PrintIntrinsics, false, \
2435 "prints attempted and successful inlining of intrinsics") \
2436 \
2437 product(bool, UseCountLeadingZerosInstruction, false, \
2438 "Use count leading zeros instruction") \
2439 \
2440 product(bool, UsePopCountInstruction, false, \
2441 "Use population count instruction") \
2442 \
2443 diagnostic(ccstrlist, DisableIntrinsic, "", \
2444 "do not expand intrinsics whose (internal) names appear here") \
2445 \
2446 develop(bool, StressReflectiveCode, false, \
2447 "Use inexact types at allocations, etc., to test reflection") \
2448 \
2449 develop(bool, EagerInitialization, false, \
2450 "Eagerly initialize classes if possible") \
2451 \
2452 develop(bool, TraceMethodReplacement, false, \
2453 "Print when methods are replaced do to recompilation") \
2454 \
2455 develop(bool, PrintMethodFlushing, false, \
2456 "print the nmethods being flushed") \
2457 \
2458 notproduct(bool, LogMultipleMutexLocking, false, \
2459 "log locking and unlocking of mutexes (only if multiple locks " \
2460 "are held)") \
2461 \
2462 develop(bool, UseRelocIndex, false, \
2463 "use an index to speed random access to relocations") \
2464 \
2465 develop(bool, StressCodeBuffers, false, \
2466 "Exercise code buffer expansion and other rare state changes") \
2467 \
2468 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2469 "Generate extra debugging info for non-safepoints in nmethods") \
2470 \
2471 diagnostic(bool, DebugInlinedCalls, true, \
2472 "If false, restricts profiled locations to the root method only") \
2473 \
2474 product(bool, PrintVMOptions, trueInDebug, \
2475 "Print flags that appeared on the command line") \
2476 \
2477 product(bool, IgnoreUnrecognizedVMOptions, false, \
2478 "Ignore unrecognized VM options") \
2479 \
2480 product(bool, PrintCommandLineFlags, false, \
2481 "Print flags specified on command line or set by ergonomics") \
2482 \
2483 product(bool, PrintFlagsInitial, false, \
2484 "Print all VM flags before argument processing and exit VM") \
2485 \
2486 product(bool, PrintFlagsFinal, false, \
2487 "Print all VM flags after argument and ergonomic processing") \
2488 \
2489 notproduct(bool, PrintFlagsWithComments, false, \
2490 "Print all VM flags with default values and descriptions and exit")\
2491 \
2492 diagnostic(bool, SerializeVMOutput, true, \
2493 "Use a mutex to serialize output to tty and hotspot.log") \
2494 \
2495 diagnostic(bool, DisplayVMOutput, true, \
2496 "Display all VM output on the tty, independently of LogVMOutput") \
2497 \
2498 diagnostic(bool, LogVMOutput, trueInDebug, \
2499 "Save VM output to hotspot.log, or to LogFile") \
2500 \
2501 diagnostic(ccstr, LogFile, NULL, \
2502 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2503 \
2504 product(ccstr, ErrorFile, NULL, \
2505 "If an error occurs, save the error data to this file " \
2506 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2507 \
2508 product(bool, DisplayVMOutputToStderr, false, \
2509 "If DisplayVMOutput is true, display all VM output to stderr") \
2510 \
2511 product(bool, DisplayVMOutputToStdout, false, \
2512 "If DisplayVMOutput is true, display all VM output to stdout") \
2513 \
2514 product(bool, UseHeavyMonitors, false, \
2515 "use heavyweight instead of lightweight Java monitors") \
2516 \
2517 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2518 "print histogram of the symbol table") \
2519 \
2520 notproduct(bool, ExitVMOnVerifyError, false, \
2521 "standard exit from VM if bytecode verify error " \
2522 "(only in debug mode)") \
2523 \
2524 notproduct(ccstr, AbortVMOnException, NULL, \
2525 "Call fatal if this exception is thrown. Example: " \
2526 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2527 \
2528 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2529 "Call fatal if the exception pointed by AbortVMOnException " \
2530 "has this message.") \
2531 \
2532 develop(bool, DebugVtables, false, \
2533 "add debugging code to vtable dispatch") \
2534 \
2535 develop(bool, PrintVtables, false, \
2536 "print vtables when printing klass") \
2537 \
2538 notproduct(bool, PrintVtableStats, false, \
2539 "print vtables stats at end of run") \
2540 \
2541 develop(bool, TraceCreateZombies, false, \
2542 "trace creation of zombie nmethods") \
2543 \
2544 notproduct(bool, IgnoreLockingAssertions, false, \
2545 "disable locking assertions (for speed)") \
2546 \
2547 notproduct(bool, VerifyLoopOptimizations, false, \
2548 "verify major loop optimizations") \
2549 \
2550 product(bool, RangeCheckElimination, true, \
2551 "Split loop iterations to eliminate range checks") \
2552 \
2553 develop_pd(bool, UncommonNullCast, \
2554 "track occurrences of null in casts; adjust compiler tactics") \
2555 \
2556 develop(bool, TypeProfileCasts, true, \
2557 "treat casts like calls for purposes of type profiling") \
2558 \
2559 develop(bool, MonomorphicArrayCheck, true, \
2560 "Uncommon-trap array store checks that require full type check") \
2561 \
2562 diagnostic(bool, ProfileDynamicTypes, true, \
2563 "do extra type profiling and use it more aggressively") \
2564 \
2565 develop(bool, DelayCompilationDuringStartup, true, \
2566 "Delay invoking the compiler until main application class is " \
2567 "loaded") \
2568 \
2569 develop(bool, CompileTheWorld, false, \
2570 "Compile all methods in all classes in bootstrap class path " \
2571 "(stress test)") \
2572 \
2573 develop(bool, CompileTheWorldPreloadClasses, true, \
2574 "Preload all classes used by a class before start loading") \
2575 \
2576 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2577 "Compile all methods although class initializer failed") \
2578 \
2579 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2580 "Force a safepoint every n compiles so sweeper can keep up") \
2581 \
2582 develop(bool, TraceIterativeGVN, false, \
2583 "Print progress during Iterative Global Value Numbering") \
2584 \
2585 develop(bool, FillDelaySlots, true, \
2586 "Fill delay slots (on SPARC only)") \
2587 \
2588 develop(bool, VerifyIterativeGVN, false, \
2589 "Verify Def-Use modifications during sparse Iterative Global " \
2590 "Value Numbering") \
2591 \
2592 notproduct(bool, TracePhaseCCP, false, \
2593 "Print progress during Conditional Constant Propagation") \
2594 \
2595 develop(bool, TimeLivenessAnalysis, false, \
2596 "Time computation of bytecode liveness analysis") \
2597 \
2598 develop(bool, TraceLivenessGen, false, \
2599 "Trace the generation of liveness analysis information") \
2600 \
2601 notproduct(bool, TraceLivenessQuery, false, \
2602 "Trace queries of liveness analysis information") \
2603 \
2604 notproduct(bool, CollectIndexSetStatistics, false, \
2605 "Collect information about IndexSets") \
2606 \
2607 develop(bool, PrintDominators, false, \
2608 "Print out dominator trees for GVN") \
2609 \
2610 develop(bool, UseLoopSafepoints, true, \
2611 "Generate Safepoint nodes in every loop") \
2612 \
2613 notproduct(bool, TraceCISCSpill, false, \
2614 "Trace allocators use of cisc spillable instructions") \
2615 \
2616 notproduct(bool, TraceSpilling, false, \
2617 "Trace spilling") \
2618 \
2619 product(bool, SplitIfBlocks, true, \
2620 "Clone compares and control flow through merge points to fold " \
2621 "some branches") \
2622 \
2623 develop(intx, FastAllocateSizeLimit, 128*K, \
2624 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2625 "Inline allocations larger than this in doublewords must go slow")\
2626 \
2627 product(bool, AggressiveOpts, false, \
2628 "Enable aggressive optimizations - see arguments.cpp") \
2629 \
2630 product(bool, UseStringCache, false, \
2631 "Enable String cache capabilities on String.java") \
2632 \
2633 /* statistics */ \
2634 develop(bool, CountCompiledCalls, false, \
2635 "counts method invocations") \
2636 \
2637 notproduct(bool, CountRuntimeCalls, false, \
2638 "counts VM runtime calls") \
2639 \
2640 develop(bool, CountJNICalls, false, \
2641 "counts jni method invocations") \
2642 \
2643 notproduct(bool, CountJVMCalls, false, \
2644 "counts jvm method invocations") \
2645 \
2646 notproduct(bool, CountRemovableExceptions, false, \
2647 "count exceptions that could be replaced by branches due to " \
2648 "inlining") \
2649 \
2650 notproduct(bool, ICMissHistogram, false, \
2651 "produce histogram of IC misses") \
2652 \
2653 notproduct(bool, PrintClassStatistics, false, \
2654 "prints class statistics at end of run") \
2655 \
2656 notproduct(bool, PrintMethodStatistics, false, \
2657 "prints method statistics at end of run") \
2658 \
2659 /* interpreter */ \
2660 develop(bool, ClearInterpreterLocals, false, \
2661 "Always clear local variables of interpreter activations upon " \
2662 "entry") \
2663 \
2664 product_pd(bool, RewriteBytecodes, \
2665 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2666 \
2667 product_pd(bool, RewriteFrequentPairs, \
2668 "Rewrite frequently used bytecode pairs into a single bytecode") \
2669 \
2670 diagnostic(bool, PrintInterpreter, false, \
2671 "Prints the generated interpreter code") \
2672 \
2673 product(bool, UseInterpreter, true, \
2674 "Use interpreter for non-compiled methods") \
2675 \
2676 develop(bool, UseFastSignatureHandlers, true, \
2677 "Use fast signature handlers for native calls") \
2678 \
2679 develop(bool, UseV8InstrsOnly, false, \
2680 "Use SPARC-V8 Compliant instruction subset") \
2681 \
2682 product(bool, UseNiagaraInstrs, false, \
2683 "Use Niagara-efficient instruction subset") \
2684 \
2685 develop(bool, UseCASForSwap, false, \
2686 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2687 \
2688 product(bool, UseLoopCounter, true, \
2689 "Increment invocation counter on backward branch") \
2690 \
2691 product(bool, UseFastEmptyMethods, true, \
2692 "Use fast method entry code for empty methods") \
2693 \
2694 product(bool, UseFastAccessorMethods, true, \
2695 "Use fast method entry code for accessor methods") \
2696 \
2697 product_pd(bool, UseOnStackReplacement, \
2698 "Use on stack replacement, calls runtime if invoc. counter " \
2699 "overflows in loop") \
2700 \
2701 notproduct(bool, TraceOnStackReplacement, false, \
2702 "Trace on stack replacement") \
2703 \
2704 develop(bool, PoisonOSREntry, true, \
2705 "Detect abnormal calls to OSR code") \
2706 \
2707 product_pd(bool, PreferInterpreterNativeStubs, \
2708 "Use always interpreter stubs for native methods invoked via " \
2709 "interpreter") \
2710 \
2711 develop(bool, CountBytecodes, false, \
2712 "Count number of bytecodes executed") \
2713 \
2714 develop(bool, PrintBytecodeHistogram, false, \
2715 "Print histogram of the executed bytecodes") \
2716 \
2717 develop(bool, PrintBytecodePairHistogram, false, \
2718 "Print histogram of the executed bytecode pairs") \
2719 \
2720 diagnostic(bool, PrintSignatureHandlers, false, \
2721 "Print code generated for native method signature handlers") \
2722 \
2723 develop(bool, VerifyOops, false, \
2724 "Do plausibility checks for oops") \
2725 \
2726 develop(bool, CheckUnhandledOops, false, \
2727 "Check for unhandled oops in VM code") \
2728 \
2729 develop(bool, VerifyJNIFields, trueInDebug, \
2730 "Verify jfieldIDs for instance fields") \
2731 \
2732 notproduct(bool, VerifyJNIEnvThread, false, \
2733 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2734 "from JNI") \
2735 \
2736 develop(bool, VerifyFPU, false, \
2737 "Verify FPU state (check for NaN's, etc.)") \
2738 \
2739 develop(bool, VerifyThread, false, \
2740 "Watch the thread register for corruption (SPARC only)") \
2741 \
2742 develop(bool, VerifyActivationFrameSize, false, \
2743 "Verify that activation frame didn't become smaller than its " \
2744 "minimal size") \
2745 \
2746 develop(bool, TraceFrequencyInlining, false, \
2747 "Trace frequency based inlining") \
2748 \
2749 notproduct(bool, TraceTypeProfile, false, \
2750 "Trace type profile") \
2751 \
2752 develop_pd(bool, InlineIntrinsics, \
2753 "Inline intrinsics that can be statically resolved") \
2754 \
2755 product_pd(bool, ProfileInterpreter, \
2756 "Profile at the bytecode level during interpretation") \
2757 \
2758 develop_pd(bool, ProfileTraps, \
2759 "Profile deoptimization traps at the bytecode level") \
2760 \
2761 product(intx, ProfileMaturityPercentage, 20, \
2762 "number of method invocations/branches (expressed as % of " \
2763 "CompileThreshold) before using the method's profile") \
2764 \
2765 develop(bool, PrintMethodData, false, \
2766 "Print the results of +ProfileInterpreter at end of run") \
2767 \
2768 develop(bool, VerifyDataPointer, trueInDebug, \
2769 "Verify the method data pointer during interpreter profiling") \
2770 \
2771 develop(bool, VerifyCompiledCode, false, \
2772 "Include miscellaneous runtime verifications in nmethod code; " \
2773 "default off because it disturbs nmethod size heuristics") \
2774 \
2775 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2776 "Manually make GC thread crash then dump java stack trace; " \
2777 "Test only") \
2778 \
2779 /* compilation */ \
2780 product(bool, UseCompiler, true, \
2781 "use compilation") \
2782 \
2783 develop(bool, TraceCompilationPolicy, false, \
2784 "Trace compilation policy") \
2785 \
2786 develop(bool, TimeCompilationPolicy, false, \
2787 "Time the compilation policy") \
2788 \
2789 product(bool, UseCounterDecay, true, \
2790 "adjust recompilation counters") \
2791 \
2792 develop(intx, CounterHalfLifeTime, 30, \
2793 "half-life time of invocation counters (in secs)") \
2794 \
2795 develop(intx, CounterDecayMinIntervalLength, 500, \
2796 "Min. ms. between invocation of CounterDecay") \
2797 \
2798 product(bool, AlwaysCompileLoopMethods, false, \
2799 "when using recompilation, never interpret methods " \
2800 "containing loops") \
2801 \
2802 product(bool, DontCompileHugeMethods, true, \
2803 "don't compile methods > HugeMethodLimit") \
2804 \
2805 /* Bytecode escape analysis estimation. */ \
2806 product(bool, EstimateArgEscape, true, \
2807 "Analyze bytecodes to estimate escape state of arguments") \
2808 \
2809 product(intx, BCEATraceLevel, 0, \
2810 "How much tracing to do of bytecode escape analysis estimates") \
2811 \
2812 product(intx, MaxBCEAEstimateLevel, 5, \
2813 "Maximum number of nested calls that are analyzed by BC EA.") \
2814 \
2815 product(intx, MaxBCEAEstimateSize, 150, \
2816 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2817 \
2818 product(intx, AllocatePrefetchStyle, 1, \
2819 "0 = no prefetch, " \
2820 "1 = prefetch instructions for each allocation, " \
2821 "2 = use TLAB watermark to gate allocation prefetch, " \
2822 "3 = use BIS instruction on Sparc for allocation prefetch") \
2823 \
2824 product(intx, AllocatePrefetchDistance, -1, \
2825 "Distance to prefetch ahead of allocation pointer") \
2826 \
2827 product(intx, AllocatePrefetchLines, 1, \
2828 "Number of lines to prefetch ahead of allocation pointer") \
2829 \
2830 product(intx, AllocatePrefetchStepSize, 16, \
2831 "Step size in bytes of sequential prefetch instructions") \
2832 \
2833 product(intx, AllocatePrefetchInstr, 0, \
2834 "Prefetch instruction to prefetch ahead of allocation pointer") \
2835 \
2836 product(intx, ReadPrefetchInstr, 0, \
2837 "Prefetch instruction to prefetch ahead") \
2838 \
2839 /* deoptimization */ \
2840 develop(bool, TraceDeoptimization, false, \
2841 "Trace deoptimization") \
2842 \
2843 develop(bool, DebugDeoptimization, false, \
2844 "Tracing various information while debugging deoptimization") \
2845 \
2846 product(intx, SelfDestructTimer, 0, \
2847 "Will cause VM to terminate after a given time (in minutes) " \
2848 "(0 means off)") \
2849 \
2850 product(intx, MaxJavaStackTraceDepth, 1024, \
2851 "Max. no. of lines in the stack trace for Java exceptions " \
2852 "(0 means all)") \
2853 \
2854 develop(intx, GuaranteedSafepointInterval, 1000, \
2855 "Guarantee a safepoint (at least) every so many milliseconds " \
2856 "(0 means none)") \
2857 \
2858 product(intx, SafepointTimeoutDelay, 10000, \
2859 "Delay in milliseconds for option SafepointTimeout") \
2860 \
2861 product(intx, NmethodSweepFraction, 4, \
2862 "Number of invocations of sweeper to cover all nmethods") \
2863 \
2864 product(intx, NmethodSweepCheckInterval, 5, \
2865 "Compilers wake up every n seconds to possibly sweep nmethods") \
2866 \
2867 notproduct(intx, MemProfilingInterval, 500, \
2868 "Time between each invocation of the MemProfiler") \
2869 \
2870 develop(intx, MallocCatchPtr, -1, \
2871 "Hit breakpoint when mallocing/freeing this pointer") \
2872 \
2873 notproduct(intx, AssertRepeat, 1, \
2874 "number of times to evaluate expression in assert " \
2875 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2876 \
2877 notproduct(ccstrlist, SuppressErrorAt, "", \
2878 "List of assertions (file:line) to muzzle") \
2879 \
2880 notproduct(uintx, HandleAllocationLimit, 1024, \
2881 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2882 "is used") \
2883 \
2884 develop(uintx, TotalHandleAllocationLimit, 1024, \
2885 "Threshold for total handle allocation when " \
2886 "+TraceHandleAllocation is used") \
2887 \
2888 develop(intx, StackPrintLimit, 100, \
2889 "number of stack frames to print in VM-level stack dump") \
2890 \
2891 notproduct(intx, MaxElementPrintSize, 256, \
2892 "maximum number of elements to print") \
2893 \
2894 notproduct(intx, MaxSubklassPrintSize, 4, \
2895 "maximum number of subklasses to print when printing klass") \
2896 \
2897 product(intx, MaxInlineLevel, 9, \
2898 "maximum number of nested calls that are inlined") \
2899 \
2900 product(intx, MaxRecursiveInlineLevel, 1, \
2901 "maximum number of nested recursive calls that are inlined") \
2902 \
2903 product_pd(intx, InlineSmallCode, \
2904 "Only inline already compiled methods if their code size is " \
2905 "less than this") \
2906 \
2907 product(intx, MaxInlineSize, 35, \
2908 "maximum bytecode size of a method to be inlined") \
2909 \
2910 product_pd(intx, FreqInlineSize, \
2911 "maximum bytecode size of a frequent method to be inlined") \
2912 \
2913 product(intx, MaxTrivialSize, 6, \
2914 "maximum bytecode size of a trivial method to be inlined") \
2915 \
2916 product(intx, MinInliningThreshold, 250, \
2917 "min. invocation count a method needs to have to be inlined") \
2918 \
2919 develop(intx, AlignEntryCode, 4, \
2920 "aligns entry code to specified value (in bytes)") \
2921 \
2922 develop(intx, MethodHistogramCutoff, 100, \
2923 "cutoff value for method invoc. histogram (+CountCalls)") \
2924 \
2925 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2926 "# of interpreted methods to show in profile") \
2927 \
2928 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2929 "# of compiled methods to show in profile") \
2930 \
2931 develop(intx, ProfilerNumberOfStubMethods, 25, \
2932 "# of stub methods to show in profile") \
2933 \
2934 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2935 "# of runtime stub nodes to show in profile") \
2936 \
2937 product(intx, ProfileIntervalsTicks, 100, \
2938 "# of ticks between printing of interval profile " \
2939 "(+ProfileIntervals)") \
2940 \
2941 notproduct(intx, ScavengeALotInterval, 1, \
2942 "Interval between which scavenge will occur with +ScavengeALot") \
2943 \
2944 notproduct(intx, FullGCALotInterval, 1, \
2945 "Interval between which full gc will occur with +FullGCALot") \
2946 \
2947 notproduct(intx, FullGCALotStart, 0, \
2948 "For which invocation to start FullGCAlot") \
2949 \
2950 notproduct(intx, FullGCALotDummies, 32*K, \
2951 "Dummy object allocated with +FullGCALot, forcing all objects " \
2952 "to move") \
2953 \
2954 develop(intx, DontYieldALotInterval, 10, \
2955 "Interval between which yields will be dropped (milliseconds)") \
2956 \
2957 develop(intx, MinSleepInterval, 1, \
2958 "Minimum sleep() interval (milliseconds) when " \
2959 "ConvertSleepToYield is off (used for SOLARIS)") \
2960 \
2961 product(intx, EventLogLength, 2000, \
2962 "maximum nof events in event log") \
2963 \
2964 develop(intx, ProfilerPCTickThreshold, 15, \
2965 "Number of ticks in a PC buckets to be a hotspot") \
2966 \
2967 notproduct(intx, DeoptimizeALotInterval, 5, \
2968 "Number of exits until DeoptimizeALot kicks in") \
2969 \
2970 notproduct(intx, ZombieALotInterval, 5, \
2971 "Number of exits until ZombieALot kicks in") \
2972 \
2973 develop(bool, StressNonEntrant, false, \
2974 "Mark nmethods non-entrant at registration") \
2975 \
2976 diagnostic(intx, MallocVerifyInterval, 0, \
2977 "if non-zero, verify C heap after every N calls to " \
2978 "malloc/realloc/free") \
2979 \
2980 diagnostic(intx, MallocVerifyStart, 0, \
2981 "if non-zero, start verifying C heap after Nth call to " \
2982 "malloc/realloc/free") \
2983 \
2984 product(intx, TypeProfileWidth, 2, \
2985 "number of receiver types to record in call/cast profile") \
2986 \
2987 develop(intx, BciProfileWidth, 2, \
2988 "number of return bci's to record in ret profile") \
2989 \
2990 product(intx, PerMethodRecompilationCutoff, 400, \
2991 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2992 \
2993 product(intx, PerBytecodeRecompilationCutoff, 200, \
2994 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2995 \
2996 product(intx, PerMethodTrapLimit, 100, \
2997 "Limit on traps (of one kind) in a method (includes inlines)") \
2998 \
2999 product(intx, PerBytecodeTrapLimit, 4, \
3000 "Limit on traps (of one kind) at a particular BCI") \
3001 \
3002 develop(intx, FreqCountInvocations, 1, \
3003 "Scaling factor for branch frequencies (deprecated)") \
3004 \
3005 develop(intx, InlineFrequencyRatio, 20, \
3006 "Ratio of call site execution to caller method invocation") \
3007 \
3008 develop_pd(intx, InlineFrequencyCount, \
3009 "Count of call site execution necessary to trigger frequent " \
3010 "inlining") \
3011 \
3012 develop(intx, InlineThrowCount, 50, \
3013 "Force inlining of interpreted methods that throw this often") \
3014 \
3015 develop(intx, InlineThrowMaxSize, 200, \
3016 "Force inlining of throwing methods smaller than this") \
3017 \
3018 product(intx, AliasLevel, 3, \
3019 "0 for no aliasing, 1 for oop/field/static/array split, " \
3020 "2 for class split, 3 for unique instances") \
3021 \
3022 develop(bool, VerifyAliases, false, \
3023 "perform extra checks on the results of alias analysis") \
3024 \
3025 develop(intx, ProfilerNodeSize, 1024, \
3026 "Size in K to allocate for the Profile Nodes of each thread") \
3027 \
3028 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
3029 "Number of times to spin wait on a v8 atomic operation lock") \
3030 \
3031 product(intx, ReadSpinIterations, 100, \
3032 "Number of read attempts before a yield (spin inner loop)") \
3033 \
3034 product_pd(intx, PreInflateSpin, \
3035 "Number of times to spin wait before inflation") \
3036 \
3037 product(intx, PreBlockSpin, 10, \
3038 "Number of times to spin in an inflated lock before going to " \
3039 "an OS lock") \
3040 \
3041 /* gc parameters */ \
3042 product(uintx, InitialHeapSize, 0, \
3043 "Initial heap size (in bytes); zero means OldSize + NewSize") \
3044 \
3045 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3046 "Maximum heap size (in bytes)") \
3047 \
3048 product(uintx, OldSize, ScaleForWordSize(4*M), \
3049 "Initial tenured generation size (in bytes)") \
3050 \
3051 product(uintx, NewSize, ScaleForWordSize(1*M), \
3052 "Initial new generation size (in bytes)") \
3053 \
3054 product(uintx, MaxNewSize, max_uintx, \
3055 "Maximum new generation size (in bytes), max_uintx means set " \
3056 "ergonomically") \
3057 \
3058 product(uintx, PretenureSizeThreshold, 0, \
3059 "Maximum size in bytes of objects allocated in DefNew " \
3060 "generation; zero means no maximum") \
3061 \
3062 product(uintx, TLABSize, 0, \
3063 "Starting TLAB size (in bytes); zero means set ergonomically") \
3064 \
3065 product(uintx, MinTLABSize, 2*K, \
3066 "Minimum allowed TLAB size (in bytes)") \
3067 \
3068 product(uintx, TLABAllocationWeight, 35, \
3069 "Allocation averaging weight") \
3070 \
3071 product(uintx, TLABWasteTargetPercent, 1, \
3072 "Percentage of Eden that can be wasted") \
3073 \
3074 product(uintx, TLABRefillWasteFraction, 64, \
3075 "Max TLAB waste at a refill (internal fragmentation)") \
3076 \
3077 product(uintx, TLABWasteIncrement, 4, \
3078 "Increment allowed waste at slow allocation") \
3079 \
3080 product(intx, SurvivorRatio, 8, \
3081 "Ratio of eden/survivor space size") \
3082 \
3083 product(intx, NewRatio, 2, \
3084 "Ratio of new/old generation sizes") \
3085 \
3086 product_pd(uintx, NewSizeThreadIncrease, \
3087 "Additional size added to desired new generation size per " \
3088 "non-daemon thread (in bytes)") \
3089 \
3090 product_pd(uintx, PermSize, \
3091 "Initial size of permanent generation (in bytes)") \
3092 \
3093 product_pd(uintx, MaxPermSize, \
3094 "Maximum size of permanent generation (in bytes)") \
3095 \
3096 product(uintx, MinHeapFreeRatio, 40, \
3097 "Min percentage of heap free after GC to avoid expansion") \
3098 \
3099 product(uintx, MaxHeapFreeRatio, 70, \
3100 "Max percentage of heap free after GC to avoid shrinking") \
3101 \
3102 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3103 "Number of milliseconds per MB of free space in the heap") \
3104 \
3105 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3106 "Min change in heap space due to GC (in bytes)") \
3107 \
3108 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
3109 "Min expansion of permanent heap (in bytes)") \
3110 \
3111 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3112 "Max expansion of permanent heap without full GC (in bytes)") \
3113 \
3114 product(intx, QueuedAllocationWarningCount, 0, \
3115 "Number of times an allocation that queues behind a GC " \
3116 "will retry before printing a warning") \
3117 \
3118 diagnostic(uintx, VerifyGCStartAt, 0, \
3119 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3120 \
3121 diagnostic(intx, VerifyGCLevel, 0, \
3122 "Generation level at which to start +VerifyBefore/AfterGC") \
3123 \
3124 develop(uintx, ExitAfterGCNum, 0, \
3125 "If non-zero, exit after this GC.") \
3126 \
3127 product(intx, MaxTenuringThreshold, 15, \
3128 "Maximum value for tenuring threshold") \
3129 \
3130 product(intx, InitialTenuringThreshold, 7, \
3131 "Initial value for tenuring threshold") \
3132 \
3133 product(intx, TargetSurvivorRatio, 50, \
3134 "Desired percentage of survivor space used after scavenge") \
3135 \
3136 product(uintx, MarkSweepDeadRatio, 5, \
3137 "Percentage (0-100) of the old gen allowed as dead wood." \
3138 "Serial mark sweep treats this as both the min and max value." \
3139 "CMS uses this value only if it falls back to mark sweep." \
3140 "Par compact uses a variable scale based on the density of the" \
3141 "generation and treats this as the max value when the heap is" \
3142 "either completely full or completely empty. Par compact also" \
3143 "has a smaller default value; see arguments.cpp.") \
3144 \
3145 product(uintx, PermMarkSweepDeadRatio, 20, \
3146 "Percentage (0-100) of the perm gen allowed as dead wood." \
3147 "See MarkSweepDeadRatio for collector-specific comments.") \
3148 \
3149 product(intx, MarkSweepAlwaysCompactCount, 4, \
3150 "How often should we fully compact the heap (ignoring the dead " \
3151 "space parameters)") \
3152 \
3153 product(intx, PrintCMSStatistics, 0, \
3154 "Statistics for CMS") \
3155 \
3156 product(bool, PrintCMSInitiationStatistics, false, \
3157 "Statistics for initiating a CMS collection") \
3158 \
3159 product(intx, PrintFLSStatistics, 0, \
3160 "Statistics for CMS' FreeListSpace") \
3161 \
3162 product(intx, PrintFLSCensus, 0, \
3163 "Census for CMS' FreeListSpace") \
3164 \
3165 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3166 "Delay in ms between expansion and allocation") \
3167 \
3168 product(intx, DeferThrSuspendLoopCount, 4000, \
3169 "(Unstable) Number of times to iterate in safepoint loop " \
3170 " before blocking VM threads ") \
3171 \
3172 product(intx, DeferPollingPageLoopCount, -1, \
3173 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3174 "before changing safepoint polling page to RO ") \
3175 \
3176 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3177 \
3178 product(bool, PSChunkLargeArrays, true, \
3179 "true: process large arrays in chunks") \
3180 \
3181 product(uintx, GCDrainStackTargetSize, 64, \
3182 "how many entries we'll try to leave on the stack during " \
3183 "parallel GC") \
3184 \
3185 /* stack parameters */ \
3186 product_pd(intx, StackYellowPages, \
3187 "Number of yellow zone (recoverable overflows) pages") \
3188 \
3189 product_pd(intx, StackRedPages, \
3190 "Number of red zone (unrecoverable overflows) pages") \
3191 \
3192 product_pd(intx, StackShadowPages, \
3193 "Number of shadow zone (for overflow checking) pages" \
3194 " this should exceed the depth of the VM and native call stack") \
3195 \
3196 product_pd(intx, ThreadStackSize, \
3197 "Thread Stack Size (in Kbytes)") \
3198 \
3199 product_pd(intx, VMThreadStackSize, \
3200 "Non-Java Thread Stack Size (in Kbytes)") \
3201 \
3202 product_pd(intx, CompilerThreadStackSize, \
3203 "Compiler Thread Stack Size (in Kbytes)") \
3204 \
3205 develop_pd(uintx, JVMInvokeMethodSlack, \
3206 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3207 \
3208 product(uintx, ThreadSafetyMargin, 50*M, \
3209 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3210 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3211 "disable this feature") \
3212 \
3213 /* code cache parameters */ \
3214 develop(uintx, CodeCacheSegmentSize, 64, \
3215 "Code cache segment size (in bytes) - smallest unit of " \
3216 "allocation") \
3217 \
3218 develop_pd(intx, CodeEntryAlignment, \
3219 "Code entry alignment for generated code (in bytes)") \
3220 \
3221 product_pd(intx, OptoLoopAlignment, \
3222 "Align inner loops to zero relative to this modulus") \
3223 \
3224 product_pd(uintx, InitialCodeCacheSize, \
3225 "Initial code cache size (in bytes)") \
3226 \
3227 product_pd(uintx, ReservedCodeCacheSize, \
3228 "Reserved code cache size (in bytes) - maximum code cache size") \
3229 \
3230 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3231 "When less than X space left, we stop compiling.") \
3232 \
3233 product_pd(uintx, CodeCacheExpansionSize, \
3234 "Code cache expansion size (in bytes)") \
3235 \
3236 develop_pd(uintx, CodeCacheMinBlockLength, \
3237 "Minimum number of segments in a code cache block.") \
3238 \
3239 notproduct(bool, ExitOnFullCodeCache, false, \
3240 "Exit the VM if we fill the code cache.") \
3241 \
3242 product(bool, UseCodeCacheFlushing, false, \
3243 "Attempt to clean the code cache before shutting off compiler") \
3244 \
3245 product(intx, MinCodeCacheFlushingInterval, 30, \
3246 "Min number of seconds between code cache cleaning sessions") \
3247 \
3248 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3249 "When less than X space left, start code cache cleaning") \
3250 \
3251 /* interpreter debugging */ \
3252 develop(intx, BinarySwitchThreshold, 5, \
3253 "Minimal number of lookupswitch entries for rewriting to binary " \
3254 "switch") \
3255 \
3256 develop(intx, StopInterpreterAt, 0, \
3257 "Stops interpreter execution at specified bytecode number") \
3258 \
3259 develop(intx, TraceBytecodesAt, 0, \
3260 "Traces bytecodes starting with specified bytecode number") \
3261 \
3262 /* compiler interface */ \
3263 develop(intx, CIStart, 0, \
3264 "the id of the first compilation to permit") \
3265 \
3266 develop(intx, CIStop, -1, \
3267 "the id of the last compilation to permit") \
3268 \
3269 develop(intx, CIStartOSR, 0, \
3270 "the id of the first osr compilation to permit " \
3271 "(CICountOSR must be on)") \
3272 \
3273 develop(intx, CIStopOSR, -1, \
3274 "the id of the last osr compilation to permit " \
3275 "(CICountOSR must be on)") \
3276 \
3277 develop(intx, CIBreakAtOSR, -1, \
3278 "id of osr compilation to break at") \
3279 \
3280 develop(intx, CIBreakAt, -1, \
3281 "id of compilation to break at") \
3282 \
3283 product(ccstrlist, CompileOnly, "", \
3284 "List of methods (pkg/class.name) to restrict compilation to") \
3285 \
3286 product(ccstr, CompileCommandFile, NULL, \
3287 "Read compiler commands from this file [.hotspot_compiler]") \
3288 \
3289 product(ccstrlist, CompileCommand, "", \
3290 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3291 \
3292 product(bool, CICompilerCountPerCPU, false, \
3293 "1 compiler thread for log(N CPUs)") \
3294 \
3295 develop(intx, CIFireOOMAt, -1, \
3296 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3297 "(non-negative value throws OOM after this many CI accesses " \
3298 "in each compile)") \
3299 \
3300 develop(intx, CIFireOOMAtDelay, -1, \
3301 "Wait for this many CI accesses to occur in all compiles before " \
3302 "beginning to throw OutOfMemoryErrors in each compile") \
3303 \
3304 notproduct(bool, CIObjectFactoryVerify, false, \
3305 "enable potentially expensive verification in ciObjectFactory") \
3306 \
3307 /* Priorities */ \
3308 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3309 \
3310 product(intx, ThreadPriorityPolicy, 0, \
3311 "0 : Normal. "\
3312 " VM chooses priorities that are appropriate for normal "\
3313 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3314 " to normal native priority. Java priorities below NORM_PRIORITY"\
3315 " map to lower native priority values. On Windows applications"\
3316 " are allowed to use higher native priorities. However, with "\
3317 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3318 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3319 " interfere with system threads. On Linux thread priorities "\
3320 " are ignored because the OS does not support static priority "\
3321 " in SCHED_OTHER scheduling class which is the only choice for"\
3322 " non-root, non-realtime applications. "\
3323 "1 : Aggressive. "\
3324 " Java thread priorities map over to the entire range of "\
3325 " native thread priorities. Higher Java thread priorities map "\
3326 " to higher native thread priorities. This policy should be "\
3327 " used with care, as sometimes it can cause performance "\
3328 " degradation in the application and/or the entire system. On "\
3329 " Linux this policy requires root privilege.") \
3330 \
3331 product(bool, ThreadPriorityVerbose, false, \
3332 "print priority changes") \
3333 \
3334 product(intx, DefaultThreadPriority, -1, \
3335 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3336 \
3337 product(intx, CompilerThreadPriority, -1, \
3338 "what priority should compiler threads run at (-1 means no change)") \
3339 \
3340 product(intx, VMThreadPriority, -1, \
3341 "what priority should VM threads run at (-1 means no change)") \
3342 \
3343 product(bool, CompilerThreadHintNoPreempt, true, \
3344 "(Solaris only) Give compiler threads an extra quanta") \
3345 \
3346 product(bool, VMThreadHintNoPreempt, false, \
3347 "(Solaris only) Give VM thread an extra quanta") \
3348 \
3349 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3350 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3351 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3352 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3353 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3354 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3355 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3356 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3357 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3358 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3359 \
3360 /* compiler debugging */ \
3361 notproduct(intx, CompileTheWorldStartAt, 1, \
3362 "First class to consider when using +CompileTheWorld") \
3363 \
3364 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3365 "Last class to consider when using +CompileTheWorld") \
3366 \
3367 develop(intx, NewCodeParameter, 0, \
3368 "Testing Only: Create a dedicated integer parameter before " \
3369 "putback") \
3370 \
3371 /* new oopmap storage allocation */ \
3372 develop(intx, MinOopMapAllocation, 8, \
3373 "Minimum number of OopMap entries in an OopMapSet") \
3374 \
3375 /* Background Compilation */ \
3376 develop(intx, LongCompileThreshold, 50, \
3377 "Used with +TraceLongCompiles") \
3378 \
3379 product(intx, StarvationMonitorInterval, 200, \
3380 "Pause between each check in ms") \
3381 \
3382 /* recompilation */ \
3383 product_pd(intx, CompileThreshold, \
3384 "number of interpreted method invocations before (re-)compiling") \
3385 \
3386 product_pd(intx, BackEdgeThreshold, \
3387 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3388 \
3389 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3390 "Interpreter (tier 0) invocation notification frequency.") \
3391 \
3392 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3393 "C1 without MDO (tier 2) invocation notification frequency.") \
3394 \
3395 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3396 "C1 with MDO profiling (tier 3) invocation notification " \
3397 "frequency.") \
3398 \
3399 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3400 "Interpreter (tier 0) invocation notification frequency.") \
3401 \
3402 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3403 "C1 without MDO (tier 2) invocation notification frequency.") \
3404 \
3405 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3406 "C1 with MDO profiling (tier 3) invocation notification " \
3407 "frequency.") \
3408 \
3409 product(intx, Tier2CompileThreshold, 0, \
3410 "threshold at which tier 2 compilation is invoked") \
3411 \
3412 product(intx, Tier2BackEdgeThreshold, 0, \
3413 "Back edge threshold at which tier 2 compilation is invoked") \
3414 \
3415 product(intx, Tier3InvocationThreshold, 200, \
3416 "Compile if number of method invocations crosses this " \
3417 "threshold") \
3418 \
3419 product(intx, Tier3MinInvocationThreshold, 100, \
3420 "Minimum invocation to compile at tier 3") \
3421 \
3422 product(intx, Tier3CompileThreshold, 2000, \
3423 "Threshold at which tier 3 compilation is invoked (invocation " \
3424 "minimum must be satisfied.") \
3425 \
3426 product(intx, Tier3BackEdgeThreshold, 7000, \
3427 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3428 \
3429 product(intx, Tier4InvocationThreshold, 5000, \
3430 "Compile if number of method invocations crosses this " \
3431 "threshold") \
3432 \
3433 product(intx, Tier4MinInvocationThreshold, 600, \
3434 "Minimum invocation to compile at tier 4") \
3435 \
3436 product(intx, Tier4CompileThreshold, 15000, \
3437 "Threshold at which tier 4 compilation is invoked (invocation " \
3438 "minimum must be satisfied.") \
3439 \
3440 product(intx, Tier4BackEdgeThreshold, 40000, \
3441 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3442 \
3443 product(intx, Tier3DelayOn, 5, \
3444 "If C2 queue size grows over this amount per compiler thread " \
3445 "stop compiling at tier 3 and start compiling at tier 2") \
3446 \
3447 product(intx, Tier3DelayOff, 2, \
3448 "If C2 queue size is less than this amount per compiler thread " \
3449 "allow methods compiled at tier 2 transition to tier 3") \
3450 \
3451 product(intx, Tier3LoadFeedback, 5, \
3452 "Tier 3 thresholds will increase twofold when C1 queue size " \
3453 "reaches this amount per compiler thread") \
3454 \
3455 product(intx, Tier4LoadFeedback, 3, \
3456 "Tier 4 thresholds will increase twofold when C2 queue size " \
3457 "reaches this amount per compiler thread") \
3458 \
3459 product(intx, TieredCompileTaskTimeout, 50, \
3460 "Kill compile task if method was not used within " \
3461 "given timeout in milliseconds") \
3462 \
3463 product(intx, TieredStopAtLevel, 4, \
3464 "Stop at given compilation level") \
3465 \
3466 product(intx, Tier0ProfilingStartPercentage, 200, \
3467 "Start profiling in interpreter if the counters exceed tier 3" \
3468 "thresholds by the specified percentage") \
3469 \
3470 product(intx, TieredRateUpdateMinTime, 1, \
3471 "Minimum rate sampling interval (in milliseconds)") \
3472 \
3473 product(intx, TieredRateUpdateMaxTime, 25, \
3474 "Maximum rate sampling interval (in milliseconds)") \
3475 \
3476 product_pd(bool, TieredCompilation, \
3477 "Enable tiered compilation") \
3478 \
3479 product(bool, PrintTieredEvents, false, \
3480 "Print tiered events notifications") \
3481 \
3482 product(bool, StressTieredRuntime, false, \
3483 "Alternate client and server compiler on compile requests") \
3484 \
3485 product_pd(intx, OnStackReplacePercentage, \
3486 "NON_TIERED number of method invocations/branches (expressed as %"\
3487 "of CompileThreshold) before (re-)compiling OSR code") \
3488 \
3489 product(intx, InterpreterProfilePercentage, 33, \
3490 "NON_TIERED number of method invocations/branches (expressed as %"\
3491 "of CompileThreshold) before profiling in the interpreter") \
3492 \
3493 develop(intx, MaxRecompilationSearchLength, 10, \
3494 "max. # frames to inspect searching for recompilee") \
3495 \
3496 develop(intx, MaxInterpretedSearchLength, 3, \
3497 "max. # interp. frames to skip when searching for recompilee") \
3498 \
3499 develop(intx, DesiredMethodLimit, 8000, \
3500 "desired max. method size (in bytecodes) after inlining") \
3501 \
3502 develop(intx, HugeMethodLimit, 8000, \
3503 "don't compile methods larger than this if " \
3504 "+DontCompileHugeMethods") \
3505 \
3506 /* New JDK 1.4 reflection implementation */ \
3507 \
3508 develop(bool, UseNewReflection, true, \
3509 "Temporary flag for transition to reflection based on dynamic " \
3510 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3511 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3512 "changes were needed") \
3513 \
3514 develop(bool, VerifyReflectionBytecodes, false, \
3515 "Force verification of 1.4 reflection bytecodes. Does not work " \
3516 "in situations like that described in 4486457 or for " \
3517 "constructors generated for serialization, so can not be enabled "\
3518 "in product.") \
3519 \
3520 product(bool, ReflectionWrapResolutionErrors, true, \
3521 "Temporary flag for transition to AbstractMethodError wrapped " \
3522 "in InvocationTargetException. See 6531596") \
3523 \
3524 \
3525 develop(intx, FastSuperclassLimit, 8, \
3526 "Depth of hardwired instanceof accelerator array") \
3527 \
3528 /* Properties for Java libraries */ \
3529 \
3530 product(intx, MaxDirectMemorySize, -1, \
3531 "Maximum total size of NIO direct-buffer allocations") \
3532 \
3533 /* temporary developer defined flags */ \
3534 \
3535 diagnostic(bool, UseNewCode, false, \
3536 "Testing Only: Use the new version while testing") \
3537 \
3538 diagnostic(bool, UseNewCode2, false, \
3539 "Testing Only: Use the new version while testing") \
3540 \
3541 diagnostic(bool, UseNewCode3, false, \
3542 "Testing Only: Use the new version while testing") \
3543 \
3544 /* flags for performance data collection */ \
3545 \
3546 product(bool, UsePerfData, true, \
3547 "Flag to disable jvmstat instrumentation for performance testing" \
3548 "and problem isolation purposes.") \
3549 \
3550 product(bool, PerfDataSaveToFile, false, \
3551 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3552 \
3553 product(ccstr, PerfDataSaveFile, NULL, \
3554 "Save PerfData memory to the specified absolute pathname," \
3555 "%p in the file name if present will be replaced by pid") \
3556 \
3557 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3558 "Data sampling interval in milliseconds") \
3559 \
3560 develop(bool, PerfTraceDataCreation, false, \
3561 "Trace creation of Performance Data Entries") \
3562 \
3563 develop(bool, PerfTraceMemOps, false, \
3564 "Trace PerfMemory create/attach/detach calls") \
3565 \
3566 product(bool, PerfDisableSharedMem, false, \
3567 "Store performance data in standard memory") \
3568 \
3569 product(intx, PerfDataMemorySize, 32*K, \
3570 "Size of performance data memory region. Will be rounded " \
3571 "up to a multiple of the native os page size.") \
3572 \
3573 product(intx, PerfMaxStringConstLength, 1024, \
3574 "Maximum PerfStringConstant string length before truncation") \
3575 \
3576 product(bool, PerfAllowAtExitRegistration, false, \
3577 "Allow registration of atexit() methods") \
3578 \
3579 product(bool, PerfBypassFileSystemCheck, false, \
3580 "Bypass Win32 file system criteria checks (Windows Only)") \
3581 \
3582 product(intx, UnguardOnExecutionViolation, 0, \
3583 "Unguard page and retry on no-execute fault (Win32 only)" \
3584 "0=off, 1=conservative, 2=aggressive") \
3585 \
3586 /* Serviceability Support */ \
3587 \
3588 product(bool, ManagementServer, false, \
3589 "Create JMX Management Server") \
3590 \
3591 product(bool, DisableAttachMechanism, false, \
3592 "Disable mechanism that allows tools to attach to this VM") \
3593 \
3594 product(bool, StartAttachListener, false, \
3595 "Always start Attach Listener at VM startup") \
3596 \
3597 manageable(bool, PrintConcurrentLocks, false, \
3598 "Print java.util.concurrent locks in thread dump") \
3599 \
3600 /* Shared spaces */ \
3601 \
3602 product(bool, UseSharedSpaces, true, \
3603 "Use shared spaces in the permanent generation") \
3604 \
3605 product(bool, RequireSharedSpaces, false, \
3606 "Require shared spaces in the permanent generation") \
3607 \
3608 product(bool, ForceSharedSpaces, false, \
3609 "Require shared spaces in the permanent generation") \
3610 \
3611 product(bool, DumpSharedSpaces, false, \
3612 "Special mode: JVM reads a class list, loads classes, builds " \
3613 "shared spaces, and dumps the shared spaces to a file to be " \
3614 "used in future JVM runs.") \
3615 \
3616 product(bool, PrintSharedSpaces, false, \
3617 "Print usage of shared spaces") \
3618 \
3619 product(uintx, SharedDummyBlockSize, 512*M, \
3620 "Size of dummy block used to shift heap addresses (in bytes)") \
3621 \
3622 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \
3623 "Size of read-write space in permanent generation (in bytes)") \
3624 \
3625 product(uintx, SharedReadOnlySize, 10*M, \
3626 "Size of read-only space in permanent generation (in bytes)") \
3627 \
3628 product(uintx, SharedMiscDataSize, 4*M, \
3629 "Size of the shared data area adjacent to the heap (in bytes)") \
3630 \
3631 product(uintx, SharedMiscCodeSize, 4*M, \
3632 "Size of the shared code area adjacent to the heap (in bytes)") \
3633 \
3634 diagnostic(bool, SharedOptimizeColdStart, true, \
3635 "At dump time, order shared objects to achieve better " \
3636 "cold startup time.") \
3637 \
3638 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3639 "Reordering policy for SharedOptimizeColdStart " \
3640 "0=favor classload-time locality, 1=balanced, " \
3641 "2=favor runtime locality") \
3642 \
3643 diagnostic(bool, SharedSkipVerify, false, \
3644 "Skip assert() and verify() which page-in unwanted shared " \
3645 "objects. ") \
3646 \
3647 product(bool, AnonymousClasses, false, \
3648 "support sun.misc.Unsafe.defineAnonymousClass") \
3649 \
3650 experimental(bool, EnableMethodHandles, false, \
3651 "support method handles (true by default under JSR 292)") \
3652 \
3653 diagnostic(intx, MethodHandlePushLimit, 3, \
3654 "number of additional stack slots a method handle may push") \
3655 \
3656 develop(bool, TraceMethodHandles, false, \
3657 "trace internal method handle operations") \
3658 \
3659 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3660 "perform extra checks when constructing method handles") \
3661 \
3662 diagnostic(bool, OptimizeMethodHandles, true, \
3663 "when constructing method handles, try to improve them") \
3664 \
3665 experimental(bool, TrustFinalNonStaticFields, false, \
3666 "trust final non-static declarations for constant folding") \
3667 \
3668 experimental(bool, EnableInvokeDynamic, false, \
3669 "recognize the invokedynamic instruction") \
3670 \
3671 experimental(bool, AllowTransitionalJSR292, true, \
3672 "recognize pre-PFD formats of invokedynamic") \
3673 \
3674 develop(bool, TraceInvokeDynamic, false, \
3675 "trace internal invoke dynamic operations") \
3676 \
3677 diagnostic(bool, PauseAtStartup, false, \
3678 "Causes the VM to pause at startup time and wait for the pause " \
3679 "file to be removed (default: ./vm.paused.<pid>)") \
3680 \
3681 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3682 "The file to create and for whose removal to await when pausing " \
3683 "at startup. (default: ./vm.paused.<pid>)") \
3684 \
3685 product(bool, ExtendedDTraceProbes, false, \
3686 "Enable performance-impacting dtrace probes") \
3687 \
3688 product(bool, DTraceMethodProbes, false, \
3689 "Enable dtrace probes for method-entry and method-exit") \
3690 \
3691 product(bool, DTraceAllocProbes, false, \
3692 "Enable dtrace probes for object allocation") \
3693 \
3694 product(bool, DTraceMonitorProbes, false, \
3695 "Enable dtrace probes for monitor events") \
3696 \
3697 product(bool, RelaxAccessControlCheck, false, \
3698 "Relax the access control checks in the verifier") \
3699 \
3700 diagnostic(bool, PrintDTraceDOF, false, \
3701 "Print the DTrace DOF passed to the system for JSDT probes") \
3702 \
3703 product(bool, UseVMInterruptibleIO, false, \
3704 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3705 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3706 " of this flag is true for JDK 6 and earliers")
3707
3708 /*
3709 * Macros for factoring of globals
3710 */
3711
3712 // Interface macros
3713 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3714 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3715 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3716 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3717 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3718 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3719 #ifdef PRODUCT
3720 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3721 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3722 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3723 #else
3724 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3725 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3726 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3727 #endif
3728 // Special LP64 flags, product only needed for now.
3729 #ifdef _LP64
3730 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3731 #else
3732 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3733 #endif // _LP64
3734
3735 // Implementation macros
3736 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3737 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3738 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3739 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3740 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3741 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3742 #ifdef PRODUCT
3743 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3744 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3745 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3746 #else
3747 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3748 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3749 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3750 #endif
3751 #ifdef _LP64
3752 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3753 #else
3754 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3755 #endif // _LP64
3756
3757 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3758
3759 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3760
3761 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP