Wed, 27 Apr 2011 15:40:36 -0700
7029167: add support for conditional card marks
Reviewed-by: iveresov, kvn
1 /*
2 * Copyright (c) 1997, 2011, 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 */
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
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_ARCH_arm
39 # include "globals_arm.hpp"
40 #endif
41 #ifdef TARGET_ARCH_ppc
42 # include "globals_ppc.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "globals_linux.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "globals_solaris.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "globals_windows.hpp"
52 #endif
53 #ifdef TARGET_OS_ARCH_linux_x86
54 # include "globals_linux_x86.hpp"
55 #endif
56 #ifdef TARGET_OS_ARCH_linux_sparc
57 # include "globals_linux_sparc.hpp"
58 #endif
59 #ifdef TARGET_OS_ARCH_linux_zero
60 # include "globals_linux_zero.hpp"
61 #endif
62 #ifdef TARGET_OS_ARCH_solaris_x86
63 # include "globals_solaris_x86.hpp"
64 #endif
65 #ifdef TARGET_OS_ARCH_solaris_sparc
66 # include "globals_solaris_sparc.hpp"
67 #endif
68 #ifdef TARGET_OS_ARCH_windows_x86
69 # include "globals_windows_x86.hpp"
70 #endif
71 #ifdef TARGET_OS_ARCH_linux_arm
72 # include "globals_linux_arm.hpp"
73 #endif
74 #ifdef TARGET_OS_ARCH_linux_ppc
75 # include "globals_linux_ppc.hpp"
76 #endif
77 #ifdef COMPILER1
78 #ifdef TARGET_ARCH_x86
79 # include "c1_globals_x86.hpp"
80 #endif
81 #ifdef TARGET_ARCH_sparc
82 # include "c1_globals_sparc.hpp"
83 #endif
84 #ifdef TARGET_ARCH_arm
85 # include "c1_globals_arm.hpp"
86 #endif
87 #ifdef TARGET_ARCH_ppc
88 # include "c1_globals_ppc.hpp"
89 #endif
90 #ifdef TARGET_OS_FAMILY_linux
91 # include "c1_globals_linux.hpp"
92 #endif
93 #ifdef TARGET_OS_FAMILY_solaris
94 # include "c1_globals_solaris.hpp"
95 #endif
96 #ifdef TARGET_OS_FAMILY_windows
97 # include "c1_globals_windows.hpp"
98 #endif
99 #endif
100 #ifdef COMPILER2
101 #ifdef TARGET_ARCH_x86
102 # include "c2_globals_x86.hpp"
103 #endif
104 #ifdef TARGET_ARCH_sparc
105 # include "c2_globals_sparc.hpp"
106 #endif
107 #ifdef TARGET_ARCH_arm
108 # include "c2_globals_arm.hpp"
109 #endif
110 #ifdef TARGET_OS_FAMILY_linux
111 # include "c2_globals_linux.hpp"
112 #endif
113 #ifdef TARGET_OS_FAMILY_solaris
114 # include "c2_globals_solaris.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_windows
117 # include "c2_globals_windows.hpp"
118 #endif
119 #endif
120 #ifdef SHARK
121 #ifdef TARGET_ARCH_zero
122 # include "shark_globals_zero.hpp"
123 #endif
124 #endif
126 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
127 define_pd_global(bool, BackgroundCompilation, false);
128 define_pd_global(bool, UseTLAB, false);
129 define_pd_global(bool, CICompileOSR, false);
130 define_pd_global(bool, UseTypeProfile, false);
131 define_pd_global(bool, UseOnStackReplacement, false);
132 define_pd_global(bool, InlineIntrinsics, false);
133 define_pd_global(bool, PreferInterpreterNativeStubs, true);
134 define_pd_global(bool, ProfileInterpreter, false);
135 define_pd_global(bool, ProfileTraps, false);
136 define_pd_global(bool, TieredCompilation, false);
138 define_pd_global(intx, CompileThreshold, 0);
139 define_pd_global(intx, BackEdgeThreshold, 0);
141 define_pd_global(intx, OnStackReplacePercentage, 0);
142 define_pd_global(bool, ResizeTLAB, false);
143 define_pd_global(intx, FreqInlineSize, 0);
144 define_pd_global(intx, InlineSmallCode, 0);
145 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
146 define_pd_global(intx, InlineClassNatives, true);
147 define_pd_global(intx, InlineUnsafeOps, true);
148 define_pd_global(intx, InitialCodeCacheSize, 160*K);
149 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
150 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
151 define_pd_global(intx, CodeCacheMinBlockLength, 1);
152 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
153 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
154 define_pd_global(bool, NeverActAsServerClassMachine, true);
155 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
156 #define CI_COMPILER_COUNT 0
157 #else
159 #ifdef COMPILER2
160 #define CI_COMPILER_COUNT 2
161 #else
162 #define CI_COMPILER_COUNT 1
163 #endif // COMPILER2
165 #endif // no compilers
168 // string type aliases used only in this file
169 typedef const char* ccstr;
170 typedef const char* ccstrlist; // represents string arguments which accumulate
172 enum FlagValueOrigin {
173 DEFAULT = 0,
174 COMMAND_LINE = 1,
175 ENVIRON_VAR = 2,
176 CONFIG_FILE = 3,
177 MANAGEMENT = 4,
178 ERGONOMIC = 5,
179 ATTACH_ON_DEMAND = 6,
180 INTERNAL = 99
181 };
183 struct Flag {
184 const char *type;
185 const char *name;
186 void* addr;
188 NOT_PRODUCT(const char *doc;)
190 const char *kind;
191 FlagValueOrigin origin;
193 // points to all Flags static array
194 static Flag *flags;
196 // number of flags
197 static size_t numFlags;
199 static Flag* find_flag(char* name, size_t length);
201 bool is_bool() const { return strcmp(type, "bool") == 0; }
202 bool get_bool() const { return *((bool*) addr); }
203 void set_bool(bool value) { *((bool*) addr) = value; }
205 bool is_intx() const { return strcmp(type, "intx") == 0; }
206 intx get_intx() const { return *((intx*) addr); }
207 void set_intx(intx value) { *((intx*) addr) = value; }
209 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
210 uintx get_uintx() const { return *((uintx*) addr); }
211 void set_uintx(uintx value) { *((uintx*) addr) = value; }
213 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
214 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
215 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
217 bool is_double() const { return strcmp(type, "double") == 0; }
218 double get_double() const { return *((double*) addr); }
219 void set_double(double value) { *((double*) addr) = value; }
221 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
222 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
223 ccstr get_ccstr() const { return *((ccstr*) addr); }
224 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
226 bool is_unlocker() const;
227 bool is_unlocked() const;
228 bool is_writeable() const;
229 bool is_external() const;
231 void print_on(outputStream* st, bool withComments = false );
232 void print_as_flag(outputStream* st);
233 };
235 // debug flags control various aspects of the VM and are global accessible
237 // use FlagSetting to temporarily change some debug flag
238 // e.g. FlagSetting fs(DebugThisAndThat, true);
239 // restored to previous value upon leaving scope
240 class FlagSetting {
241 bool val;
242 bool* flag;
243 public:
244 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
245 ~FlagSetting() { *flag = val; }
246 };
249 class CounterSetting {
250 intx* counter;
251 public:
252 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
253 ~CounterSetting() { (*counter)--; }
254 };
257 class IntFlagSetting {
258 intx val;
259 intx* flag;
260 public:
261 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
262 ~IntFlagSetting() { *flag = val; }
263 };
266 class DoubleFlagSetting {
267 double val;
268 double* flag;
269 public:
270 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
271 ~DoubleFlagSetting() { *flag = val; }
272 };
275 class CommandLineFlags {
276 public:
277 static bool boolAt(char* name, size_t len, bool* value);
278 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
279 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
280 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
282 static bool intxAt(char* name, size_t len, intx* value);
283 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
284 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
285 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
287 static bool uintxAt(char* name, size_t len, uintx* value);
288 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
289 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
290 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
292 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
293 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
294 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
295 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
297 static bool doubleAt(char* name, size_t len, double* value);
298 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
299 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
300 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
302 static bool ccstrAt(char* name, size_t len, ccstr* value);
303 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
304 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
305 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
307 // Returns false if name is not a command line flag.
308 static bool wasSetOnCmdline(const char* name, bool* value);
309 static void printSetFlags();
311 static void printFlags(bool withComments = false );
313 static void verify() PRODUCT_RETURN;
314 };
316 // use this for flags that are true by default in the debug version but
317 // false in the optimized version, and vice versa
318 #ifdef ASSERT
319 #define trueInDebug true
320 #define falseInDebug false
321 #else
322 #define trueInDebug false
323 #define falseInDebug true
324 #endif
326 // use this for flags that are true per default in the product build
327 // but false in development builds, and vice versa
328 #ifdef PRODUCT
329 #define trueInProduct true
330 #define falseInProduct false
331 #else
332 #define trueInProduct false
333 #define falseInProduct true
334 #endif
336 // use this for flags that are true per default in the tiered build
337 // but false in non-tiered builds, and vice versa
338 #ifdef TIERED
339 #define trueInTiered true
340 #define falseInTiered false
341 #else
342 #define trueInTiered false
343 #define falseInTiered true
344 #endif
346 // develop flags are settable / visible only during development and are constant in the PRODUCT version
347 // product flags are always settable / visible
348 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
350 // A flag must be declared with one of the following types:
351 // bool, intx, uintx, ccstr.
352 // The type "ccstr" is an alias for "const char*" and is used
353 // only in this file, because the macrology requires single-token type names.
355 // Note: Diagnostic options not meant for VM tuning or for product modes.
356 // They are to be used for VM quality assurance or field diagnosis
357 // of VM bugs. They are hidden so that users will not be encouraged to
358 // try them as if they were VM ordinary execution options. However, they
359 // are available in the product version of the VM. Under instruction
360 // from support engineers, VM customers can turn them on to collect
361 // diagnostic information about VM problems. To use a VM diagnostic
362 // option, you must first specify +UnlockDiagnosticVMOptions.
363 // (This master switch also affects the behavior of -Xprintflags.)
364 //
365 // experimental flags are in support of features that are not
366 // part of the officially supported product, but are available
367 // for experimenting with. They could, for example, be performance
368 // features that may not have undergone full or rigorous QA, but which may
369 // help performance in some cases and released for experimentation
370 // by the community of users and developers. This flag also allows one to
371 // be able to build a fully supported product that nonetheless also
372 // ships with some unsupported, lightly tested, experimental features.
373 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
374 // UnlockExperimentalVMOptions flag, which allows the control and
375 // modification of the experimental flags.
376 //
377 // Nota bene: neither diagnostic nor experimental options should be used casually,
378 // and they are not supported on production loads, except under explicit
379 // direction from support engineers.
380 //
381 // manageable flags are writeable external product flags.
382 // They are dynamically writeable through the JDK management interface
383 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
384 // These flags are external exported interface (see CCC). The list of
385 // manageable flags can be queried programmatically through the management
386 // interface.
387 //
388 // A flag can be made as "manageable" only if
389 // - the flag is defined in a CCC as an external exported interface.
390 // - the VM implementation supports dynamic setting of the flag.
391 // This implies that the VM must *always* query the flag variable
392 // and not reuse state related to the flag state at any given time.
393 // - you want the flag to be queried programmatically by the customers.
394 //
395 // product_rw flags are writeable internal product flags.
396 // They are like "manageable" flags but for internal/private use.
397 // The list of product_rw flags are internal/private flags which
398 // may be changed/removed in a future release. It can be set
399 // through the management interface to get/set value
400 // when the name of flag is supplied.
401 //
402 // A flag can be made as "product_rw" only if
403 // - the VM implementation supports dynamic setting of the flag.
404 // This implies that the VM must *always* query the flag variable
405 // and not reuse state related to the flag state at any given time.
406 //
407 // Note that when there is a need to support develop flags to be writeable,
408 // it can be done in the same way as product_rw.
410 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
411 \
412 lp64_product(bool, UseCompressedOops, false, \
413 "Use 32-bit object references in 64-bit VM. " \
414 "lp64_product means flag is always constant in 32 bit VM") \
415 \
416 notproduct(bool, CheckCompressedOops, true, \
417 "generate checks in encoding/decoding code in debug VM") \
418 \
419 product_pd(uintx, HeapBaseMinAddress, \
420 "OS specific low limit for heap base address") \
421 \
422 diagnostic(bool, PrintCompressedOopsMode, false, \
423 "Print compressed oops base address and encoding mode") \
424 \
425 lp64_product(intx, ObjectAlignmentInBytes, 8, \
426 "Default object alignment in bytes, 8 is minimum") \
427 \
428 /* UseMembar is theoretically a temp flag used for memory barrier \
429 * removal testing. It was supposed to be removed before FCS but has \
430 * been re-added (see 6401008) */ \
431 product_pd(bool, UseMembar, \
432 "(Unstable) Issues membars on thread state transitions") \
433 \
434 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
435 * that don't support it. This will be replaced by processor detection \
436 * logic. \
437 */ \
438 product(bool, UsePPCLWSYNC, true, \
439 "Use lwsync instruction if true, else use slower sync") \
440 \
441 /* Temporary: See 6948537 */ \
442 experimental(bool, UseMemSetInBOT, true, \
443 "(Unstable) uses memset in BOT updates in GC code") \
444 \
445 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
446 "Enable normal processing of flags relating to field diagnostics")\
447 \
448 experimental(bool, UnlockExperimentalVMOptions, false, \
449 "Enable normal processing of flags relating to experimental features")\
450 \
451 product(bool, JavaMonitorsInStackTrace, true, \
452 "Print info. about Java monitor locks when the stacks are dumped")\
453 \
454 product_pd(bool, UseLargePages, \
455 "Use large page memory") \
456 \
457 product_pd(bool, UseLargePagesIndividualAllocation, \
458 "Allocate large pages individually for better affinity") \
459 \
460 develop(bool, LargePagesIndividualAllocationInjectError, false, \
461 "Fail large pages individual allocation") \
462 \
463 develop(bool, TracePageSizes, false, \
464 "Trace page size selection and usage.") \
465 \
466 product(bool, UseNUMA, false, \
467 "Use NUMA if available") \
468 \
469 product(bool, ForceNUMA, false, \
470 "Force NUMA optimizations on single-node/UMA systems") \
471 \
472 product(intx, NUMAChunkResizeWeight, 20, \
473 "Percentage (0-100) used to weight the current sample when " \
474 "computing exponentially decaying average for " \
475 "AdaptiveNUMAChunkSizing") \
476 \
477 product(intx, NUMASpaceResizeRate, 1*G, \
478 "Do not reallocate more that this amount per collection") \
479 \
480 product(bool, UseAdaptiveNUMAChunkSizing, true, \
481 "Enable adaptive chunk sizing for NUMA") \
482 \
483 product(bool, NUMAStats, false, \
484 "Print NUMA stats in detailed heap information") \
485 \
486 product(intx, NUMAPageScanRate, 256, \
487 "Maximum number of pages to include in the page scan procedure") \
488 \
489 product_pd(bool, NeedsDeoptSuspend, \
490 "True for register window machines (sparc/ia64)") \
491 \
492 product(intx, UseSSE, 99, \
493 "Highest supported SSE instructions set on x86/x64") \
494 \
495 product(uintx, LargePageSizeInBytes, 0, \
496 "Large page size (0 to let VM choose the page size") \
497 \
498 product(uintx, LargePageHeapSizeThreshold, 128*M, \
499 "Use large pages if max heap is at least this big") \
500 \
501 product(bool, ForceTimeHighResolution, false, \
502 "Using high time resolution(For Win32 only)") \
503 \
504 develop(bool, TraceItables, false, \
505 "Trace initialization and use of itables") \
506 \
507 develop(bool, TracePcPatching, false, \
508 "Trace usage of frame::patch_pc") \
509 \
510 develop(bool, TraceJumps, false, \
511 "Trace assembly jumps in thread ring buffer") \
512 \
513 develop(bool, TraceRelocator, false, \
514 "Trace the bytecode relocator") \
515 \
516 develop(bool, TraceLongCompiles, false, \
517 "Print out every time compilation is longer than " \
518 "a given threashold") \
519 \
520 develop(bool, SafepointALot, false, \
521 "Generates a lot of safepoints. Works with " \
522 "GuaranteedSafepointInterval") \
523 \
524 product_pd(bool, BackgroundCompilation, \
525 "A thread requesting compilation is not blocked during " \
526 "compilation") \
527 \
528 product(bool, PrintVMQWaitTime, false, \
529 "Prints out the waiting time in VM operation queue") \
530 \
531 develop(bool, BailoutToInterpreterForThrows, false, \
532 "Compiled methods which throws/catches exceptions will be " \
533 "deopt and intp.") \
534 \
535 develop(bool, NoYieldsInMicrolock, false, \
536 "Disable yields in microlock") \
537 \
538 develop(bool, TraceOopMapGeneration, false, \
539 "Shows oopmap generation") \
540 \
541 product(bool, MethodFlushing, true, \
542 "Reclamation of zombie and not-entrant methods") \
543 \
544 develop(bool, VerifyStack, false, \
545 "Verify stack of each thread when it is entering a runtime call") \
546 \
547 develop(bool, ForceUnreachable, false, \
548 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
549 \
550 notproduct(bool, StressDerivedPointers, false, \
551 "Force scavenge when a derived pointers is detected on stack " \
552 "after rtm call") \
553 \
554 develop(bool, TraceDerivedPointers, false, \
555 "Trace traversal of derived pointers on stack") \
556 \
557 notproduct(bool, TraceCodeBlobStacks, false, \
558 "Trace stack-walk of codeblobs") \
559 \
560 product(bool, PrintJNIResolving, false, \
561 "Used to implement -v:jni") \
562 \
563 notproduct(bool, PrintRewrites, false, \
564 "Print methods that are being rewritten") \
565 \
566 product(bool, UseInlineCaches, true, \
567 "Use Inline Caches for virtual calls ") \
568 \
569 develop(bool, InlineArrayCopy, true, \
570 "inline arraycopy native that is known to be part of " \
571 "base library DLL") \
572 \
573 develop(bool, InlineObjectHash, true, \
574 "inline Object::hashCode() native that is known to be part " \
575 "of base library DLL") \
576 \
577 develop(bool, InlineObjectCopy, true, \
578 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
579 \
580 develop(bool, InlineNatives, true, \
581 "inline natives that are known to be part of base library DLL") \
582 \
583 develop(bool, InlineMathNatives, true, \
584 "inline SinD, CosD, etc.") \
585 \
586 develop(bool, InlineClassNatives, true, \
587 "inline Class.isInstance, etc") \
588 \
589 develop(bool, InlineAtomicLong, true, \
590 "inline sun.misc.AtomicLong") \
591 \
592 develop(bool, InlineThreadNatives, true, \
593 "inline Thread.currentThread, etc") \
594 \
595 develop(bool, InlineReflectionGetCallerClass, true, \
596 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
597 "of base library DLL") \
598 \
599 develop(bool, InlineUnsafeOps, true, \
600 "inline memory ops (native methods) from sun.misc.Unsafe") \
601 \
602 develop(bool, ConvertCmpD2CmpF, true, \
603 "Convert cmpD to cmpF when one input is constant in float range") \
604 \
605 develop(bool, ConvertFloat2IntClipping, true, \
606 "Convert float2int clipping idiom to integer clipping") \
607 \
608 develop(bool, SpecialStringCompareTo, true, \
609 "special version of string compareTo") \
610 \
611 develop(bool, SpecialStringIndexOf, true, \
612 "special version of string indexOf") \
613 \
614 develop(bool, SpecialStringEquals, true, \
615 "special version of string equals") \
616 \
617 develop(bool, SpecialArraysEquals, true, \
618 "special version of Arrays.equals(char[],char[])") \
619 \
620 product(bool, UseSSE42Intrinsics, false, \
621 "SSE4.2 versions of intrinsics") \
622 \
623 product(bool, UseCondCardMark, false, \
624 "Check for already marked card before updating card table") \
625 \
626 develop(bool, TraceCallFixup, false, \
627 "traces all call fixups") \
628 \
629 develop(bool, DeoptimizeALot, false, \
630 "deoptimize at every exit from the runtime system") \
631 \
632 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
633 "a comma separated list of bcis to deoptimize at") \
634 \
635 product(bool, DeoptimizeRandom, false, \
636 "deoptimize random frames on random exit from the runtime system")\
637 \
638 notproduct(bool, ZombieALot, false, \
639 "creates zombies (non-entrant) at exit from the runt. system") \
640 \
641 product(bool, UnlinkSymbolsALot, false, \
642 "unlink unreferenced symbols from the symbol table at safepoints")\
643 \
644 notproduct(bool, WalkStackALot, false, \
645 "trace stack (no print) at every exit from the runtime system") \
646 \
647 develop(bool, Debugging, false, \
648 "set when executing debug methods in debug.ccp " \
649 "(to prevent triggering assertions)") \
650 \
651 notproduct(bool, StrictSafepointChecks, trueInDebug, \
652 "Enable strict checks that safepoints cannot happen for threads " \
653 "that used No_Safepoint_Verifier") \
654 \
655 notproduct(bool, VerifyLastFrame, false, \
656 "Verify oops on last frame on entry to VM") \
657 \
658 develop(bool, TraceHandleAllocation, false, \
659 "Prints out warnings when suspicious many handles are allocated") \
660 \
661 product(bool, UseCompilerSafepoints, true, \
662 "Stop at safepoints in compiled code") \
663 \
664 product(bool, UseSplitVerifier, true, \
665 "use split verifier with StackMapTable attributes") \
666 \
667 product(bool, FailOverToOldVerifier, true, \
668 "fail over to old verifier when split verifier fails") \
669 \
670 develop(bool, ShowSafepointMsgs, false, \
671 "Show msg. about safepoint synch.") \
672 \
673 product(bool, SafepointTimeout, false, \
674 "Time out and warn or fail after SafepointTimeoutDelay " \
675 "milliseconds if failed to reach safepoint") \
676 \
677 develop(bool, DieOnSafepointTimeout, false, \
678 "Die upon failure to reach safepoint (see SafepointTimeout)") \
679 \
680 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
681 /* typically, at most a few retries are needed */ \
682 product(intx, SuspendRetryCount, 50, \
683 "Maximum retry count for an external suspend request") \
684 \
685 product(intx, SuspendRetryDelay, 5, \
686 "Milliseconds to delay per retry (* current_retry_count)") \
687 \
688 product(bool, AssertOnSuspendWaitFailure, false, \
689 "Assert/Guarantee on external suspend wait failure") \
690 \
691 product(bool, TraceSuspendWaitFailures, false, \
692 "Trace external suspend wait failures") \
693 \
694 product(bool, MaxFDLimit, true, \
695 "Bump the number of file descriptors to max in solaris.") \
696 \
697 notproduct(bool, LogEvents, trueInDebug, \
698 "Enable Event log") \
699 \
700 product(bool, BytecodeVerificationRemote, true, \
701 "Enables the Java bytecode verifier for remote classes") \
702 \
703 product(bool, BytecodeVerificationLocal, false, \
704 "Enables the Java bytecode verifier for local classes") \
705 \
706 develop(bool, ForceFloatExceptions, trueInDebug, \
707 "Force exceptions on FP stack under/overflow") \
708 \
709 develop(bool, SoftMatchFailure, trueInProduct, \
710 "If the DFA fails to match a node, print a message and bail out") \
711 \
712 develop(bool, VerifyStackAtCalls, false, \
713 "Verify that the stack pointer is unchanged after calls") \
714 \
715 develop(bool, TraceJavaAssertions, false, \
716 "Trace java language assertions") \
717 \
718 notproduct(bool, CheckAssertionStatusDirectives, false, \
719 "temporary - see javaClasses.cpp") \
720 \
721 notproduct(bool, PrintMallocFree, false, \
722 "Trace calls to C heap malloc/free allocation") \
723 \
724 product(bool, PrintOopAddress, false, \
725 "Always print the location of the oop") \
726 \
727 notproduct(bool, VerifyCodeCacheOften, false, \
728 "Verify compiled-code cache often") \
729 \
730 develop(bool, ZapDeadCompiledLocals, false, \
731 "Zap dead locals in compiler frames") \
732 \
733 notproduct(bool, ZapDeadLocalsOld, false, \
734 "Zap dead locals (old version, zaps all frames when " \
735 "entering the VM") \
736 \
737 notproduct(bool, CheckOopishValues, false, \
738 "Warn if value contains oop ( requires ZapDeadLocals)") \
739 \
740 develop(bool, UseMallocOnly, false, \
741 "use only malloc/free for allocation (no resource area/arena)") \
742 \
743 develop(bool, PrintMalloc, false, \
744 "print all malloc/free calls") \
745 \
746 develop(bool, PrintMallocStatistics, false, \
747 "print malloc/free statistics") \
748 \
749 develop(bool, ZapResourceArea, trueInDebug, \
750 "Zap freed resource/arena space with 0xABABABAB") \
751 \
752 notproduct(bool, ZapVMHandleArea, trueInDebug, \
753 "Zap freed VM handle space with 0xBCBCBCBC") \
754 \
755 develop(bool, ZapJNIHandleArea, trueInDebug, \
756 "Zap freed JNI handle space with 0xFEFEFEFE") \
757 \
758 notproduct(bool, ZapStackSegments, trueInDebug, \
759 "Zap allocated/freed Stack segments with 0xFADFADED") \
760 \
761 develop(bool, ZapUnusedHeapArea, trueInDebug, \
762 "Zap unused heap space with 0xBAADBABE") \
763 \
764 develop(bool, TraceZapUnusedHeapArea, false, \
765 "Trace zapping of unused heap space") \
766 \
767 develop(bool, CheckZapUnusedHeapArea, false, \
768 "Check zapping of unused heap space") \
769 \
770 develop(bool, ZapFillerObjects, trueInDebug, \
771 "Zap filler objects with 0xDEAFBABE") \
772 \
773 develop(bool, PrintVMMessages, true, \
774 "Print vm messages on console") \
775 \
776 product(bool, PrintGCApplicationConcurrentTime, false, \
777 "Print the time the application has been running") \
778 \
779 product(bool, PrintGCApplicationStoppedTime, false, \
780 "Print the time the application has been stopped") \
781 \
782 notproduct(uintx, ErrorHandlerTest, 0, \
783 "If > 0, provokes an error after VM initialization; the value" \
784 "determines which error to provoke. See test_error_handler()" \
785 "in debug.cpp.") \
786 \
787 develop(bool, Verbose, false, \
788 "Prints additional debugging information from other modes") \
789 \
790 develop(bool, PrintMiscellaneous, false, \
791 "Prints uncategorized debugging information (requires +Verbose)") \
792 \
793 develop(bool, WizardMode, false, \
794 "Prints much more debugging information") \
795 \
796 product(bool, ShowMessageBoxOnError, false, \
797 "Keep process alive on VM fatal error") \
798 \
799 product(bool, CreateMinidumpOnCrash, false, \
800 "Create minidump on VM fatal error") \
801 \
802 product_pd(bool, UseOSErrorReporting, \
803 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
804 \
805 product(bool, SuppressFatalErrorMessage, false, \
806 "Do NO Fatal Error report [Avoid deadlock]") \
807 \
808 product(ccstrlist, OnError, "", \
809 "Run user-defined commands on fatal error; see VMError.cpp " \
810 "for examples") \
811 \
812 product(ccstrlist, OnOutOfMemoryError, "", \
813 "Run user-defined commands on first java.lang.OutOfMemoryError") \
814 \
815 manageable(bool, HeapDumpBeforeFullGC, false, \
816 "Dump heap to file before any major stop-world GC") \
817 \
818 manageable(bool, HeapDumpAfterFullGC, false, \
819 "Dump heap to file after any major stop-world GC") \
820 \
821 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
822 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
823 \
824 manageable(ccstr, HeapDumpPath, NULL, \
825 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
826 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
827 "in the working directory)") \
828 \
829 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
830 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
831 "when the heap usage is larger than this") \
832 \
833 develop(uintx, HeapDumpSegmentSize, 1*G, \
834 "Approximate segment size when generating a segmented heap dump") \
835 \
836 develop(bool, BreakAtWarning, false, \
837 "Execute breakpoint upon encountering VM warning") \
838 \
839 product_pd(bool, UseVectoredExceptions, \
840 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
841 \
842 develop(bool, TraceVMOperation, false, \
843 "Trace vm operations") \
844 \
845 develop(bool, UseFakeTimers, false, \
846 "Tells whether the VM should use system time or a fake timer") \
847 \
848 diagnostic(bool, LogCompilation, false, \
849 "Log compilation activity in detail to hotspot.log or LogFile") \
850 \
851 product(bool, PrintCompilation, false, \
852 "Print compilations") \
853 \
854 diagnostic(bool, TraceNMethodInstalls, false, \
855 "Trace nmethod intallation") \
856 \
857 diagnostic(intx, ScavengeRootsInCode, 1, \
858 "0: do not allow scavengable oops in the code cache; " \
859 "1: allow scavenging from the code cache; " \
860 "2: emit as many constants as the compiler can see") \
861 \
862 diagnostic(bool, TraceOSRBreakpoint, false, \
863 "Trace OSR Breakpoint ") \
864 \
865 diagnostic(bool, TraceCompileTriggered, false, \
866 "Trace compile triggered") \
867 \
868 diagnostic(bool, TraceTriggers, false, \
869 "Trace triggers") \
870 \
871 product(bool, AlwaysRestoreFPU, false, \
872 "Restore the FPU control word after every JNI call (expensive)") \
873 \
874 notproduct(bool, PrintCompilation2, false, \
875 "Print additional statistics per compilation") \
876 \
877 diagnostic(bool, PrintAdapterHandlers, false, \
878 "Print code generated for i2c/c2i adapters") \
879 \
880 develop(bool, VerifyAdapterSharing, false, \
881 "Verify that the code for shared adapters is the equivalent") \
882 \
883 diagnostic(bool, PrintAssembly, false, \
884 "Print assembly code (using external disassembler.so)") \
885 \
886 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
887 "Options string passed to disassembler.so") \
888 \
889 diagnostic(bool, PrintNMethods, false, \
890 "Print assembly code for nmethods when generated") \
891 \
892 diagnostic(bool, PrintNativeNMethods, false, \
893 "Print assembly code for native nmethods when generated") \
894 \
895 develop(bool, PrintDebugInfo, false, \
896 "Print debug information for all nmethods when generated") \
897 \
898 develop(bool, PrintRelocations, false, \
899 "Print relocation information for all nmethods when generated") \
900 \
901 develop(bool, PrintDependencies, false, \
902 "Print dependency information for all nmethods when generated") \
903 \
904 develop(bool, PrintExceptionHandlers, false, \
905 "Print exception handler tables for all nmethods when generated") \
906 \
907 develop(bool, InterceptOSException, false, \
908 "Starts debugger when an implicit OS (e.g., NULL) " \
909 "exception happens") \
910 \
911 notproduct(bool, PrintCodeCache, false, \
912 "Print the compiled_code cache when exiting") \
913 \
914 develop(bool, PrintCodeCache2, false, \
915 "Print detailed info on the compiled_code cache when exiting") \
916 \
917 diagnostic(bool, PrintStubCode, false, \
918 "Print generated stub code") \
919 \
920 product(bool, StackTraceInThrowable, true, \
921 "Collect backtrace in throwable when exception happens") \
922 \
923 product(bool, OmitStackTraceInFastThrow, true, \
924 "Omit backtraces for some 'hot' exceptions in optimized code") \
925 \
926 product(bool, ProfilerPrintByteCodeStatistics, false, \
927 "Prints byte code statictics when dumping profiler output") \
928 \
929 product(bool, ProfilerRecordPC, false, \
930 "Collects tick for each 16 byte interval of compiled code") \
931 \
932 product(bool, ProfileVM, false, \
933 "Profiles ticks that fall within VM (either in the VM Thread " \
934 "or VM code called through stubs)") \
935 \
936 product(bool, ProfileIntervals, false, \
937 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
938 \
939 notproduct(bool, ProfilerCheckIntervals, false, \
940 "Collect and print info on spacing of profiler ticks") \
941 \
942 develop(bool, PrintJVMWarnings, false, \
943 "Prints warnings for unimplemented JVM functions") \
944 \
945 product(bool, PrintWarnings, true, \
946 "Prints JVM warnings to output stream") \
947 \
948 notproduct(uintx, WarnOnStalledSpinLock, 0, \
949 "Prints warnings for stalled SpinLocks") \
950 \
951 develop(bool, InitializeJavaLangSystem, true, \
952 "Initialize java.lang.System - turn off for individual " \
953 "method debugging") \
954 \
955 develop(bool, InitializeJavaLangString, true, \
956 "Initialize java.lang.String - turn off for individual " \
957 "method debugging") \
958 \
959 develop(bool, InitializeJavaLangExceptionsErrors, true, \
960 "Initialize various error and exception classes - turn off for " \
961 "individual method debugging") \
962 \
963 product(bool, RegisterFinalizersAtInit, true, \
964 "Register finalizable objects at end of Object.<init> or " \
965 "after allocation") \
966 \
967 develop(bool, RegisterReferences, true, \
968 "Tells whether the VM should register soft/weak/final/phantom " \
969 "references") \
970 \
971 develop(bool, IgnoreRewrites, false, \
972 "Supress rewrites of bytecodes in the oopmap generator. " \
973 "This is unsafe!") \
974 \
975 develop(bool, PrintCodeCacheExtension, false, \
976 "Print extension of code cache") \
977 \
978 develop(bool, UsePrivilegedStack, true, \
979 "Enable the security JVM functions") \
980 \
981 develop(bool, IEEEPrecision, true, \
982 "Enables IEEE precision (for INTEL only)") \
983 \
984 develop(bool, ProtectionDomainVerification, true, \
985 "Verifies protection domain before resolution in system " \
986 "dictionary") \
987 \
988 product(bool, ClassUnloading, true, \
989 "Do unloading of classes") \
990 \
991 diagnostic(bool, LinkWellKnownClasses, false, \
992 "Resolve a well known class as soon as its name is seen") \
993 \
994 develop(bool, DisableStartThread, false, \
995 "Disable starting of additional Java threads " \
996 "(for debugging only)") \
997 \
998 develop(bool, MemProfiling, false, \
999 "Write memory usage profiling to log file") \
1000 \
1001 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1002 "Prints the system dictionary at exit") \
1003 \
1004 diagnostic(bool, UnsyncloadClass, false, \
1005 "Unstable: VM calls loadClass unsynchronized. Custom " \
1006 "class loader must call VM synchronized for findClass " \
1007 "and defineClass.") \
1008 \
1009 product(bool, AlwaysLockClassLoader, false, \
1010 "Require the VM to acquire the class loader lock before calling " \
1011 "loadClass() even for class loaders registering " \
1012 "as parallel capable") \
1013 \
1014 product(bool, AllowParallelDefineClass, false, \
1015 "Allow parallel defineClass requests for class loaders " \
1016 "registering as parallel capable") \
1017 \
1018 product(bool, MustCallLoadClassInternal, false, \
1019 "Call loadClassInternal() rather than loadClass()") \
1020 \
1021 product_pd(bool, DontYieldALot, \
1022 "Throw away obvious excess yield calls (for SOLARIS only)") \
1023 \
1024 product_pd(bool, ConvertSleepToYield, \
1025 "Converts sleep(0) to thread yield " \
1026 "(may be off for SOLARIS to improve GUI)") \
1027 \
1028 product(bool, ConvertYieldToSleep, false, \
1029 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1030 "behavior (SOLARIS only)") \
1031 \
1032 product(bool, UseBoundThreads, true, \
1033 "Bind user level threads to kernel threads (for SOLARIS only)") \
1034 \
1035 develop(bool, UseDetachedThreads, true, \
1036 "Use detached threads that are recycled upon termination " \
1037 "(for SOLARIS only)") \
1038 \
1039 product(bool, UseLWPSynchronization, true, \
1040 "Use LWP-based instead of libthread-based synchronization " \
1041 "(SPARC only)") \
1042 \
1043 product(ccstr, SyncKnobs, NULL, \
1044 "(Unstable) Various monitor synchronization tunables") \
1045 \
1046 product(intx, EmitSync, 0, \
1047 "(Unsafe,Unstable) " \
1048 " Controls emission of inline sync fast-path code") \
1049 \
1050 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
1051 \
1052 product(intx, MonitorBound, 0, "Bound Monitor population") \
1053 \
1054 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1055 \
1056 product(intx, Atomics, 0, \
1057 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
1058 \
1059 product(intx, FenceInstruction, 0, \
1060 "(Unsafe,Unstable) Experimental") \
1061 \
1062 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1063 \
1064 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1065 \
1066 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1067 \
1068 product(intx, hashCode, 0, \
1069 "(Unstable) select hashCode generation algorithm" ) \
1070 \
1071 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1072 "(Unstable, Linux-specific)" \
1073 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1074 \
1075 product(bool, FilterSpuriousWakeups, true, \
1076 "Prevent spurious or premature wakeups from object.wait " \
1077 "(Solaris only)") \
1078 \
1079 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1080 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1081 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1082 \
1083 develop(bool, UsePthreads, false, \
1084 "Use pthread-based instead of libthread-based synchronization " \
1085 "(SPARC only)") \
1086 \
1087 product(bool, AdjustConcurrency, false, \
1088 "call thr_setconcurrency at thread create time to avoid " \
1089 "LWP starvation on MP systems (For Solaris Only)") \
1090 \
1091 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
1092 "Should the system attempt to update the compiler file when " \
1093 "an error occurs?") \
1094 \
1095 product(bool, ReduceSignalUsage, false, \
1096 "Reduce the use of OS signals in Java and/or the VM") \
1097 \
1098 notproduct(bool, ValidateMarkSweep, false, \
1099 "Do extra validation during MarkSweep collection") \
1100 \
1101 notproduct(bool, RecordMarkSweepCompaction, false, \
1102 "Enable GC-to-GC recording and querying of compaction during " \
1103 "MarkSweep") \
1104 \
1105 develop_pd(bool, ShareVtableStubs, \
1106 "Share vtable stubs (smaller code but worse branch prediction") \
1107 \
1108 develop(bool, LoadLineNumberTables, true, \
1109 "Tells whether the class file parser loads line number tables") \
1110 \
1111 develop(bool, LoadLocalVariableTables, true, \
1112 "Tells whether the class file parser loads local variable tables")\
1113 \
1114 develop(bool, LoadLocalVariableTypeTables, true, \
1115 "Tells whether the class file parser loads local variable type tables")\
1116 \
1117 product(bool, AllowUserSignalHandlers, false, \
1118 "Do not complain if the application installs signal handlers " \
1119 "(Solaris & Linux only)") \
1120 \
1121 product(bool, UseSignalChaining, true, \
1122 "Use signal-chaining to invoke signal handlers installed " \
1123 "by the application (Solaris & Linux only)") \
1124 \
1125 product(bool, UseAltSigs, false, \
1126 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1127 "internal signals (Solaris only)") \
1128 \
1129 product(bool, UseSpinning, false, \
1130 "Use spinning in monitor inflation and before entry") \
1131 \
1132 product(bool, PreSpinYield, false, \
1133 "Yield before inner spinning loop") \
1134 \
1135 product(bool, PostSpinYield, true, \
1136 "Yield after inner spinning loop") \
1137 \
1138 product(bool, AllowJNIEnvProxy, false, \
1139 "Allow JNIEnv proxies for jdbx") \
1140 \
1141 product(bool, JNIDetachReleasesMonitors, true, \
1142 "JNI DetachCurrentThread releases monitors owned by thread") \
1143 \
1144 product(bool, RestoreMXCSROnJNICalls, false, \
1145 "Restore MXCSR when returning from JNI calls") \
1146 \
1147 product(bool, CheckJNICalls, false, \
1148 "Verify all arguments to JNI calls") \
1149 \
1150 product(bool, UseFastJNIAccessors, true, \
1151 "Use optimized versions of Get<Primitive>Field") \
1152 \
1153 product(bool, EagerXrunInit, false, \
1154 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1155 " but not all -Xrun libraries may support the state of the VM at this time") \
1156 \
1157 product(bool, PreserveAllAnnotations, false, \
1158 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1159 \
1160 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1161 "Number of OutOfMemoryErrors preallocated with backtrace") \
1162 \
1163 product(bool, LazyBootClassLoader, true, \
1164 "Enable/disable lazy opening of boot class path entries") \
1165 \
1166 diagnostic(bool, UseIncDec, true, \
1167 "Use INC, DEC instructions on x86") \
1168 \
1169 product(bool, UseNewLongLShift, false, \
1170 "Use optimized bitwise shift left") \
1171 \
1172 product(bool, UseStoreImmI16, true, \
1173 "Use store immediate 16-bits value instruction on x86") \
1174 \
1175 product(bool, UseAddressNop, false, \
1176 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1177 \
1178 product(bool, UseXmmLoadAndClearUpper, true, \
1179 "Load low part of XMM register and clear upper part") \
1180 \
1181 product(bool, UseXmmRegToRegMoveAll, false, \
1182 "Copy all XMM register bits when moving value between registers") \
1183 \
1184 product(bool, UseXmmI2D, false, \
1185 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1186 \
1187 product(bool, UseXmmI2F, false, \
1188 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1189 \
1190 product(bool, UseXMMForArrayCopy, false, \
1191 "Use SSE2 MOVQ instruction for Arraycopy") \
1192 \
1193 product(bool, UseUnalignedLoadStores, false, \
1194 "Use SSE2 MOVDQU instruction for Arraycopy") \
1195 \
1196 product(intx, FieldsAllocationStyle, 1, \
1197 "0 - type based with oops first, 1 - with oops last, " \
1198 "2 - oops in super and sub classes are together") \
1199 \
1200 product(bool, CompactFields, true, \
1201 "Allocate nonstatic fields in gaps between previous fields") \
1202 \
1203 notproduct(bool, PrintCompactFieldsSavings, false, \
1204 "Print how many words were saved with CompactFields") \
1205 \
1206 product(bool, UseBiasedLocking, true, \
1207 "Enable biased locking in JVM") \
1208 \
1209 product(intx, BiasedLockingStartupDelay, 4000, \
1210 "Number of milliseconds to wait before enabling biased locking") \
1211 \
1212 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1213 "Print statistics of biased locking in JVM") \
1214 \
1215 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1216 "Threshold of number of revocations per type to try to " \
1217 "rebias all objects in the heap of that type") \
1218 \
1219 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1220 "Threshold of number of revocations per type to permanently " \
1221 "revoke biases of all objects in the heap of that type") \
1222 \
1223 product(intx, BiasedLockingDecayTime, 25000, \
1224 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1225 "type after previous bulk rebias") \
1226 \
1227 develop(bool, JavaObjectsInPerm, false, \
1228 "controls whether Classes and interned Strings are allocated" \
1229 "in perm. This purely intended to allow debugging issues" \
1230 "in production.") \
1231 \
1232 /* tracing */ \
1233 \
1234 notproduct(bool, TraceRuntimeCalls, false, \
1235 "Trace run-time calls") \
1236 \
1237 develop(bool, TraceJNICalls, false, \
1238 "Trace JNI calls") \
1239 \
1240 notproduct(bool, TraceJVMCalls, false, \
1241 "Trace JVM calls") \
1242 \
1243 product(ccstr, TraceJVMTI, NULL, \
1244 "Trace flags for JVMTI functions and events") \
1245 \
1246 /* This option can change an EMCP method into an obsolete method. */ \
1247 /* This can affect tests that except specific methods to be EMCP. */ \
1248 /* This option should be used with caution. */ \
1249 product(bool, StressLdcRewrite, false, \
1250 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1251 \
1252 product(intx, TraceRedefineClasses, 0, \
1253 "Trace level for JVMTI RedefineClasses") \
1254 \
1255 develop(bool, StressMethodComparator, false, \
1256 "run the MethodComparator on all loaded methods") \
1257 \
1258 /* change to false by default sometime after Mustang */ \
1259 product(bool, VerifyMergedCPBytecodes, true, \
1260 "Verify bytecodes after RedefineClasses constant pool merging") \
1261 \
1262 develop(bool, TraceJNIHandleAllocation, false, \
1263 "Trace allocation/deallocation of JNI handle blocks") \
1264 \
1265 develop(bool, TraceThreadEvents, false, \
1266 "Trace all thread events") \
1267 \
1268 develop(bool, TraceBytecodes, false, \
1269 "Trace bytecode execution") \
1270 \
1271 develop(bool, TraceClassInitialization, false, \
1272 "Trace class initialization") \
1273 \
1274 develop(bool, TraceExceptions, false, \
1275 "Trace exceptions") \
1276 \
1277 develop(bool, TraceICs, false, \
1278 "Trace inline cache changes") \
1279 \
1280 notproduct(bool, TraceInvocationCounterOverflow, false, \
1281 "Trace method invocation counter overflow") \
1282 \
1283 develop(bool, TraceInlineCacheClearing, false, \
1284 "Trace clearing of inline caches in nmethods") \
1285 \
1286 develop(bool, TraceDependencies, false, \
1287 "Trace dependencies") \
1288 \
1289 develop(bool, VerifyDependencies, trueInDebug, \
1290 "Exercise and verify the compilation dependency mechanism") \
1291 \
1292 develop(bool, TraceNewOopMapGeneration, false, \
1293 "Trace OopMapGeneration") \
1294 \
1295 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1296 "Trace OopMapGeneration: print detailed cell states") \
1297 \
1298 develop(bool, TimeOopMap, false, \
1299 "Time calls to GenerateOopMap::compute_map() in sum") \
1300 \
1301 develop(bool, TimeOopMap2, false, \
1302 "Time calls to GenerateOopMap::compute_map() individually") \
1303 \
1304 develop(bool, TraceMonitorMismatch, false, \
1305 "Trace monitor matching failures during OopMapGeneration") \
1306 \
1307 develop(bool, TraceOopMapRewrites, false, \
1308 "Trace rewritting of method oops during oop map generation") \
1309 \
1310 develop(bool, TraceSafepoint, false, \
1311 "Trace safepoint operations") \
1312 \
1313 develop(bool, TraceICBuffer, false, \
1314 "Trace usage of IC buffer") \
1315 \
1316 develop(bool, TraceCompiledIC, false, \
1317 "Trace changes of compiled IC") \
1318 \
1319 notproduct(bool, TraceZapDeadLocals, false, \
1320 "Trace zapping dead locals") \
1321 \
1322 develop(bool, TraceStartupTime, false, \
1323 "Trace setup time") \
1324 \
1325 product(ccstr, HPILibPath, NULL, \
1326 "Specify alternate path to HPI library") \
1327 \
1328 develop(bool, TraceProtectionDomainVerification, false, \
1329 "Trace protection domain verifcation") \
1330 \
1331 develop(bool, TraceClearedExceptions, false, \
1332 "Prints when an exception is forcibly cleared") \
1333 \
1334 product(bool, TraceClassResolution, false, \
1335 "Trace all constant pool resolutions (for debugging)") \
1336 \
1337 product(bool, TraceBiasedLocking, false, \
1338 "Trace biased locking in JVM") \
1339 \
1340 product(bool, TraceMonitorInflation, false, \
1341 "Trace monitor inflation in JVM") \
1342 \
1343 /* assembler */ \
1344 product(bool, Use486InstrsOnly, false, \
1345 "Use 80486 Compliant instruction subset") \
1346 \
1347 /* gc */ \
1348 \
1349 product(bool, UseSerialGC, false, \
1350 "Use the serial garbage collector") \
1351 \
1352 product(bool, UseG1GC, false, \
1353 "Use the Garbage-First garbage collector") \
1354 \
1355 product(bool, UseParallelGC, false, \
1356 "Use the Parallel Scavenge garbage collector") \
1357 \
1358 product(bool, UseParallelOldGC, false, \
1359 "Use the Parallel Old garbage collector") \
1360 \
1361 product(bool, UseParallelOldGCCompacting, true, \
1362 "In the Parallel Old garbage collector use parallel compaction") \
1363 \
1364 product(bool, UseParallelDensePrefixUpdate, true, \
1365 "In the Parallel Old garbage collector use parallel dense" \
1366 " prefix update") \
1367 \
1368 product(uintx, HeapMaximumCompactionInterval, 20, \
1369 "How often should we maximally compact the heap (not allowing " \
1370 "any dead space)") \
1371 \
1372 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1373 "The collection count for the first maximum compaction") \
1374 \
1375 product(bool, UseMaximumCompactionOnSystemGC, true, \
1376 "In the Parallel Old garbage collector maximum compaction for " \
1377 "a system GC") \
1378 \
1379 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1380 "The mean used by the par compact dead wood" \
1381 "limiter (a number between 0-100).") \
1382 \
1383 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1384 "The standard deviation used by the par compact dead wood" \
1385 "limiter (a number between 0-100).") \
1386 \
1387 product(bool, UseParallelOldGCDensePrefix, true, \
1388 "Use a dense prefix with the Parallel Old garbage collector") \
1389 \
1390 product(uintx, ParallelGCThreads, 0, \
1391 "Number of parallel threads parallel gc will use") \
1392 \
1393 develop(bool, ParallelOldGCSplitALot, false, \
1394 "Provoke splitting (copying data from a young gen space to" \
1395 "multiple destination spaces)") \
1396 \
1397 develop(uintx, ParallelOldGCSplitInterval, 3, \
1398 "How often to provoke splitting a young gen space") \
1399 \
1400 develop(bool, TraceRegionTasksQueuing, false, \
1401 "Trace the queuing of the region tasks") \
1402 \
1403 product(uintx, ConcGCThreads, 0, \
1404 "Number of threads concurrent gc will use") \
1405 \
1406 product(uintx, YoungPLABSize, 4096, \
1407 "Size of young gen promotion labs (in HeapWords)") \
1408 \
1409 product(uintx, OldPLABSize, 1024, \
1410 "Size of old gen promotion labs (in HeapWords)") \
1411 \
1412 product(uintx, GCTaskTimeStampEntries, 200, \
1413 "Number of time stamp entries per gc worker thread") \
1414 \
1415 product(bool, AlwaysTenure, false, \
1416 "Always tenure objects in eden. (ParallelGC only)") \
1417 \
1418 product(bool, NeverTenure, false, \
1419 "Never tenure objects in eden, May tenure on overflow " \
1420 "(ParallelGC only)") \
1421 \
1422 product(bool, ScavengeBeforeFullGC, true, \
1423 "Scavenge youngest generation before each full GC, " \
1424 "used with UseParallelGC") \
1425 \
1426 develop(bool, ScavengeWithObjectsInToSpace, false, \
1427 "Allow scavenges to occur when to_space contains objects.") \
1428 \
1429 product(bool, UseConcMarkSweepGC, false, \
1430 "Use Concurrent Mark-Sweep GC in the old generation") \
1431 \
1432 product(bool, ExplicitGCInvokesConcurrent, false, \
1433 "A System.gc() request invokes a concurrent collection;" \
1434 " (effective only when UseConcMarkSweepGC)") \
1435 \
1436 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1437 "A System.gc() request invokes a concurrent collection and " \
1438 "also unloads classes during such a concurrent gc cycle " \
1439 "(effective only when UseConcMarkSweepGC)") \
1440 \
1441 product(bool, GCLockerInvokesConcurrent, false, \
1442 "The exit of a JNI CS necessitating a scavenge also" \
1443 " kicks off a bkgrd concurrent collection") \
1444 \
1445 product(uintx, GCLockerEdenExpansionPercent, 5, \
1446 "How much the GC can expand the eden by while the GC locker " \
1447 "is active (as a percentage)") \
1448 \
1449 develop(bool, UseCMSAdaptiveFreeLists, true, \
1450 "Use Adaptive Free Lists in the CMS generation") \
1451 \
1452 develop(bool, UseAsyncConcMarkSweepGC, true, \
1453 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1454 \
1455 develop(bool, RotateCMSCollectionTypes, false, \
1456 "Rotate the CMS collections among concurrent and STW") \
1457 \
1458 product(bool, UseCMSBestFit, true, \
1459 "Use CMS best fit allocation strategy") \
1460 \
1461 product(bool, UseCMSCollectionPassing, true, \
1462 "Use passing of collection from background to foreground") \
1463 \
1464 product(bool, UseParNewGC, false, \
1465 "Use parallel threads in the new generation.") \
1466 \
1467 product(bool, ParallelGCVerbose, false, \
1468 "Verbose output for parallel GC.") \
1469 \
1470 product(intx, ParallelGCBufferWastePct, 10, \
1471 "wasted fraction of parallel allocation buffer.") \
1472 \
1473 product(bool, ParallelGCRetainPLAB, true, \
1474 "Retain parallel allocation buffers across scavenges.") \
1475 \
1476 product(intx, TargetPLABWastePct, 10, \
1477 "target wasted space in last buffer as pct of overall allocation")\
1478 \
1479 product(uintx, PLABWeight, 75, \
1480 "Percentage (0-100) used to weight the current sample when" \
1481 "computing exponentially decaying average for ResizePLAB.") \
1482 \
1483 product(bool, ResizePLAB, true, \
1484 "Dynamically resize (survivor space) promotion labs") \
1485 \
1486 product(bool, PrintPLAB, false, \
1487 "Print (survivor space) promotion labs sizing decisions") \
1488 \
1489 product(intx, ParGCArrayScanChunk, 50, \
1490 "Scan a subset and push remainder, if array is bigger than this") \
1491 \
1492 product(bool, ParGCUseLocalOverflow, false, \
1493 "Instead of a global overflow list, use local overflow stacks") \
1494 \
1495 product(bool, ParGCTrimOverflow, true, \
1496 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1497 \
1498 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1499 "Whether we should simulate work queue overflow in ParNew") \
1500 \
1501 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1502 "An `interval' counter that determines how frequently " \
1503 "we simulate overflow; a smaller number increases frequency") \
1504 \
1505 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1506 "The desired number of objects to claim from the overflow list") \
1507 \
1508 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1509 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1510 "parallel GC.") \
1511 \
1512 product(uintx, OldPLABWeight, 50, \
1513 "Percentage (0-100) used to weight the current sample when" \
1514 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1515 \
1516 product(bool, ResizeOldPLAB, true, \
1517 "Dynamically resize (old gen) promotion labs") \
1518 \
1519 product(bool, PrintOldPLAB, false, \
1520 "Print (old gen) promotion labs sizing decisions") \
1521 \
1522 product(uintx, CMSOldPLABMin, 16, \
1523 "Min size of CMS gen promotion lab caches per worker per blksize")\
1524 \
1525 product(uintx, CMSOldPLABMax, 1024, \
1526 "Max size of CMS gen promotion lab caches per worker per blksize")\
1527 \
1528 product(uintx, CMSOldPLABNumRefills, 4, \
1529 "Nominal number of refills of CMS gen promotion lab cache" \
1530 " per worker per block size") \
1531 \
1532 product(bool, CMSOldPLABResizeQuicker, false, \
1533 "Whether to react on-the-fly during a scavenge to a sudden" \
1534 " change in block demand rate") \
1535 \
1536 product(uintx, CMSOldPLABToleranceFactor, 4, \
1537 "The tolerance of the phase-change detector for on-the-fly" \
1538 " PLAB resizing during a scavenge") \
1539 \
1540 product(uintx, CMSOldPLABReactivityFactor, 2, \
1541 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1542 " during a scavenge") \
1543 \
1544 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1545 "The clamping of the gain in the feedback loop for on-the-fly" \
1546 " PLAB resizing during a scavenge") \
1547 \
1548 product(bool, AlwaysPreTouch, false, \
1549 "It forces all freshly committed pages to be pre-touched.") \
1550 \
1551 product_pd(intx, CMSYoungGenPerWorker, \
1552 "The maximum size of young gen chosen by default per GC worker " \
1553 "thread available") \
1554 \
1555 product(bool, GCOverheadReporting, false, \
1556 "Enables the GC overhead reporting facility") \
1557 \
1558 product(intx, GCOverheadReportingPeriodMS, 100, \
1559 "Reporting period for conc GC overhead reporting, in ms ") \
1560 \
1561 product(bool, CMSIncrementalMode, false, \
1562 "Whether CMS GC should operate in \"incremental\" mode") \
1563 \
1564 product(uintx, CMSIncrementalDutyCycle, 10, \
1565 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1566 "CMSIncrementalPacing is enabled, then this is just the initial" \
1567 "value") \
1568 \
1569 product(bool, CMSIncrementalPacing, true, \
1570 "Whether the CMS incremental mode duty cycle should be " \
1571 "automatically adjusted") \
1572 \
1573 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1574 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1575 "enabled (a percentage, 0-100)") \
1576 \
1577 product(uintx, CMSIncrementalSafetyFactor, 10, \
1578 "Percentage (0-100) used to add conservatism when computing the " \
1579 "duty cycle") \
1580 \
1581 product(uintx, CMSIncrementalOffset, 0, \
1582 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1583 " is shifted to the right within the period between young GCs") \
1584 \
1585 product(uintx, CMSExpAvgFactor, 50, \
1586 "Percentage (0-100) used to weight the current sample when" \
1587 "computing exponential averages for CMS statistics.") \
1588 \
1589 product(uintx, CMS_FLSWeight, 75, \
1590 "Percentage (0-100) used to weight the current sample when" \
1591 "computing exponentially decating averages for CMS FLS statistics.") \
1592 \
1593 product(uintx, CMS_FLSPadding, 1, \
1594 "The multiple of deviation from mean to use for buffering" \
1595 "against volatility in free list demand.") \
1596 \
1597 product(uintx, FLSCoalescePolicy, 2, \
1598 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1599 \
1600 product(bool, FLSAlwaysCoalesceLarge, false, \
1601 "CMS: Larger free blocks are always available for coalescing") \
1602 \
1603 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1604 "CMS: the smaller the percentage the greater the coalition force")\
1605 \
1606 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1607 "CMS: the factor by which to inflate estimated demand of small" \
1608 " block sizes to prevent coalescing with an adjoining block") \
1609 \
1610 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1611 "CMS: the factor by which to inflate estimated demand of large" \
1612 " block sizes to prevent coalescing with an adjoining block") \
1613 \
1614 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1615 "CMS: the factor by which to inflate estimated demand of small" \
1616 " block sizes to prevent splitting to supply demand for smaller" \
1617 " blocks") \
1618 \
1619 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1620 "CMS: the factor by which to inflate estimated demand of large" \
1621 " block sizes to prevent splitting to supply demand for smaller" \
1622 " blocks") \
1623 \
1624 product(bool, CMSExtrapolateSweep, false, \
1625 "CMS: cushion for block demand during sweep") \
1626 \
1627 product(uintx, CMS_SweepWeight, 75, \
1628 "Percentage (0-100) used to weight the current sample when " \
1629 "computing exponentially decaying average for inter-sweep " \
1630 "duration") \
1631 \
1632 product(uintx, CMS_SweepPadding, 1, \
1633 "The multiple of deviation from mean to use for buffering " \
1634 "against volatility in inter-sweep duration.") \
1635 \
1636 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1637 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1638 "duration exceeds this threhold in milliseconds") \
1639 \
1640 develop(bool, CMSTraceIncrementalMode, false, \
1641 "Trace CMS incremental mode") \
1642 \
1643 develop(bool, CMSTraceIncrementalPacing, false, \
1644 "Trace CMS incremental mode pacing computation") \
1645 \
1646 develop(bool, CMSTraceThreadState, false, \
1647 "Trace the CMS thread state (enable the trace_state() method)") \
1648 \
1649 product(bool, CMSClassUnloadingEnabled, false, \
1650 "Whether class unloading enabled when using CMS GC") \
1651 \
1652 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1653 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1654 " for which classes may not be unloaded") \
1655 \
1656 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1657 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1658 \
1659 product(bool, UseCMSCompactAtFullCollection, true, \
1660 "Use mark sweep compact at full collections") \
1661 \
1662 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1663 "Number of CMS full collection done before compaction if > 0") \
1664 \
1665 develop(intx, CMSDictionaryChoice, 0, \
1666 "Use BinaryTreeDictionary as default in the CMS generation") \
1667 \
1668 product(uintx, CMSIndexedFreeListReplenish, 4, \
1669 "Replenish an indexed free list with this number of chunks") \
1670 \
1671 product(bool, CMSReplenishIntermediate, true, \
1672 "Replenish all intermediate free-list caches") \
1673 \
1674 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1675 "When satisfying batched demand, split blocks from the " \
1676 "IndexedFreeList whose size is a multiple of requested size") \
1677 \
1678 product(bool, CMSLoopWarn, false, \
1679 "Warn in case of excessive CMS looping") \
1680 \
1681 develop(bool, CMSOverflowEarlyRestoration, false, \
1682 "Whether preserved marks should be restored early") \
1683 \
1684 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1685 "Size of marking stack") \
1686 \
1687 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1688 "Max size of marking stack") \
1689 \
1690 notproduct(bool, CMSMarkStackOverflowALot, false, \
1691 "Whether we should simulate frequent marking stack / work queue" \
1692 " overflow") \
1693 \
1694 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1695 "An `interval' counter that determines how frequently" \
1696 " we simulate overflow; a smaller number increases frequency") \
1697 \
1698 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1699 "(Temporary, subject to experimentation)" \
1700 "Maximum number of abortable preclean iterations, if > 0") \
1701 \
1702 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1703 "(Temporary, subject to experimentation)" \
1704 "Maximum time in abortable preclean in ms") \
1705 \
1706 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1707 "(Temporary, subject to experimentation)" \
1708 "Nominal minimum work per abortable preclean iteration") \
1709 \
1710 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1711 "(Temporary, subject to experimentation)" \
1712 " Time that we sleep between iterations when not given" \
1713 " enough work per iteration") \
1714 \
1715 product(uintx, CMSRescanMultiple, 32, \
1716 "Size (in cards) of CMS parallel rescan task") \
1717 \
1718 product(uintx, CMSConcMarkMultiple, 32, \
1719 "Size (in cards) of CMS concurrent MT marking task") \
1720 \
1721 product(uintx, CMSRevisitStackSize, 1*M, \
1722 "Size of CMS KlassKlass revisit stack") \
1723 \
1724 product(bool, CMSAbortSemantics, false, \
1725 "Whether abort-on-overflow semantics is implemented") \
1726 \
1727 product(bool, CMSParallelRemarkEnabled, true, \
1728 "Whether parallel remark enabled (only if ParNewGC)") \
1729 \
1730 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1731 "Whether parallel remark of survivor space" \
1732 " enabled (effective only if CMSParallelRemarkEnabled)") \
1733 \
1734 product(bool, CMSPLABRecordAlways, true, \
1735 "Whether to always record survivor space PLAB bdries" \
1736 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1737 \
1738 product(bool, CMSConcurrentMTEnabled, true, \
1739 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1740 \
1741 product(bool, CMSPermGenPrecleaningEnabled, true, \
1742 "Whether concurrent precleaning enabled in perm gen" \
1743 " (effective only when CMSPrecleaningEnabled is true)") \
1744 \
1745 product(bool, CMSPrecleaningEnabled, true, \
1746 "Whether concurrent precleaning enabled") \
1747 \
1748 product(uintx, CMSPrecleanIter, 3, \
1749 "Maximum number of precleaning iteration passes") \
1750 \
1751 product(uintx, CMSPrecleanNumerator, 2, \
1752 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1753 " ratio") \
1754 \
1755 product(uintx, CMSPrecleanDenominator, 3, \
1756 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1757 " ratio") \
1758 \
1759 product(bool, CMSPrecleanRefLists1, true, \
1760 "Preclean ref lists during (initial) preclean phase") \
1761 \
1762 product(bool, CMSPrecleanRefLists2, false, \
1763 "Preclean ref lists during abortable preclean phase") \
1764 \
1765 product(bool, CMSPrecleanSurvivors1, false, \
1766 "Preclean survivors during (initial) preclean phase") \
1767 \
1768 product(bool, CMSPrecleanSurvivors2, true, \
1769 "Preclean survivors during abortable preclean phase") \
1770 \
1771 product(uintx, CMSPrecleanThreshold, 1000, \
1772 "Don't re-iterate if #dirty cards less than this") \
1773 \
1774 product(bool, CMSCleanOnEnter, true, \
1775 "Clean-on-enter optimization for reducing number of dirty cards") \
1776 \
1777 product(uintx, CMSRemarkVerifyVariant, 1, \
1778 "Choose variant (1,2) of verification following remark") \
1779 \
1780 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1781 "If Eden used is below this value, don't try to schedule remark") \
1782 \
1783 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1784 "The Eden occupancy % at which to try and schedule remark pause") \
1785 \
1786 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1787 "Start sampling Eden top at least before yg occupancy reaches" \
1788 " 1/<ratio> of the size at which we plan to schedule remark") \
1789 \
1790 product(uintx, CMSSamplingGrain, 16*K, \
1791 "The minimum distance between eden samples for CMS (see above)") \
1792 \
1793 product(bool, CMSScavengeBeforeRemark, false, \
1794 "Attempt scavenge before the CMS remark step") \
1795 \
1796 develop(bool, CMSTraceSweeper, false, \
1797 "Trace some actions of the CMS sweeper") \
1798 \
1799 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1800 "Don't drain below this size per parallel worker/thief") \
1801 \
1802 manageable(intx, CMSWaitDuration, 2000, \
1803 "Time in milliseconds that CMS thread waits for young GC") \
1804 \
1805 product(bool, CMSYield, true, \
1806 "Yield between steps of concurrent mark & sweep") \
1807 \
1808 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1809 "Bitmap operations should process at most this many bits" \
1810 "between yields") \
1811 \
1812 product(bool, CMSDumpAtPromotionFailure, false, \
1813 "Dump useful information about the state of the CMS old " \
1814 " generation upon a promotion failure.") \
1815 \
1816 product(bool, CMSPrintChunksInDump, false, \
1817 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1818 " more detailed information about the free chunks.") \
1819 \
1820 product(bool, CMSPrintObjectsInDump, false, \
1821 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1822 " more detailed information about the allocated objects.") \
1823 \
1824 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1825 "Verify that all refs across the FLS boundary " \
1826 " are to valid objects") \
1827 \
1828 diagnostic(bool, FLSVerifyLists, false, \
1829 "Do lots of (expensive) FreeListSpace verification") \
1830 \
1831 diagnostic(bool, FLSVerifyIndexTable, false, \
1832 "Do lots of (expensive) FLS index table verification") \
1833 \
1834 develop(bool, FLSVerifyDictionary, false, \
1835 "Do lots of (expensive) FLS dictionary verification") \
1836 \
1837 develop(bool, VerifyBlockOffsetArray, false, \
1838 "Do (expensive!) block offset array verification") \
1839 \
1840 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1841 "Maintain _unallocated_block in BlockOffsetArray" \
1842 " (currently applicable only to CMS collector)") \
1843 \
1844 develop(bool, TraceCMSState, false, \
1845 "Trace the state of the CMS collection") \
1846 \
1847 product(intx, RefDiscoveryPolicy, 0, \
1848 "Whether reference-based(0) or referent-based(1)") \
1849 \
1850 product(bool, ParallelRefProcEnabled, false, \
1851 "Enable parallel reference processing whenever possible") \
1852 \
1853 product(bool, ParallelRefProcBalancingEnabled, true, \
1854 "Enable balancing of reference processing queues") \
1855 \
1856 product(intx, CMSTriggerRatio, 80, \
1857 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1858 "allocated before a CMS collection cycle commences") \
1859 \
1860 product(intx, CMSTriggerPermRatio, 80, \
1861 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1862 "is allocated before a CMS collection cycle commences, that " \
1863 "also collects the perm generation") \
1864 \
1865 product(uintx, CMSBootstrapOccupancy, 50, \
1866 "Percentage CMS generation occupancy at which to " \
1867 "initiate CMS collection for bootstrapping collection stats") \
1868 \
1869 product(intx, CMSInitiatingOccupancyFraction, -1, \
1870 "Percentage CMS generation occupancy to start a CMS collection " \
1871 "cycle. A negative value means that CMSTriggerRatio is used") \
1872 \
1873 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1874 "Percentage of the (entire) heap occupancy to start a " \
1875 "concurrent GC cycle. It us used by GCs that trigger a " \
1876 "concurrent GC cycle based on the occupancy of the entire heap, " \
1877 "not just one of the generations (e.g., G1). A value of 0 " \
1878 "denotes 'do constant GC cycles'.") \
1879 \
1880 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1881 "Percentage CMS perm generation occupancy to start a " \
1882 "CMScollection cycle. A negative value means that " \
1883 "CMSTriggerPermRatio is used") \
1884 \
1885 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1886 "Only use occupancy as a crierion for starting a CMS collection") \
1887 \
1888 product(intx, CMSIsTooFullPercentage, 98, \
1889 "An absolute ceiling above which CMS will always consider the " \
1890 "perm gen ripe for collection") \
1891 \
1892 develop(bool, CMSTestInFreeList, false, \
1893 "Check if the coalesced range is already in the " \
1894 "free lists as claimed") \
1895 \
1896 notproduct(bool, CMSVerifyReturnedBytes, false, \
1897 "Check that all the garbage collected was returned to the " \
1898 "free lists.") \
1899 \
1900 notproduct(bool, ScavengeALot, false, \
1901 "Force scavenge at every Nth exit from the runtime system " \
1902 "(N=ScavengeALotInterval)") \
1903 \
1904 develop(bool, FullGCALot, false, \
1905 "Force full gc at every Nth exit from the runtime system " \
1906 "(N=FullGCALotInterval)") \
1907 \
1908 notproduct(bool, GCALotAtAllSafepoints, false, \
1909 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1910 \
1911 product(bool, PrintPromotionFailure, false, \
1912 "Print additional diagnostic information following " \
1913 " promotion failure") \
1914 \
1915 notproduct(bool, PromotionFailureALot, false, \
1916 "Use promotion failure handling on every youngest generation " \
1917 "collection") \
1918 \
1919 develop(uintx, PromotionFailureALotCount, 1000, \
1920 "Number of promotion failures occurring at ParGCAllocBuffer" \
1921 "refill attempts (ParNew) or promotion attempts " \
1922 "(other young collectors) ") \
1923 \
1924 develop(uintx, PromotionFailureALotInterval, 5, \
1925 "Total collections between promotion failures alot") \
1926 \
1927 experimental(intx, WorkStealingSleepMillis, 1, \
1928 "Sleep time when sleep is used for yields") \
1929 \
1930 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1931 "Number of yields before a sleep is done during workstealing") \
1932 \
1933 experimental(uintx, WorkStealingHardSpins, 4096, \
1934 "Number of iterations in a spin loop between checks on " \
1935 "time out of hard spin") \
1936 \
1937 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1938 "Ratio of hard spins to calls to yield") \
1939 \
1940 product(uintx, PreserveMarkStackSize, 1024, \
1941 "Size for stack used in promotion failure handling") \
1942 \
1943 develop(uintx, ObjArrayMarkingStride, 512, \
1944 "Number of ObjArray elements to push onto the marking stack" \
1945 "before pushing a continuation entry") \
1946 \
1947 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1948 \
1949 product_pd(bool, ResizeTLAB, \
1950 "Dynamically resize tlab size for threads") \
1951 \
1952 product(bool, ZeroTLAB, false, \
1953 "Zero out the newly created TLAB") \
1954 \
1955 product(bool, FastTLABRefill, true, \
1956 "Use fast TLAB refill code") \
1957 \
1958 product(bool, PrintTLAB, false, \
1959 "Print various TLAB related information") \
1960 \
1961 product(bool, TLABStats, true, \
1962 "Print various TLAB related information") \
1963 \
1964 product(bool, PrintRevisitStats, false, \
1965 "Print revisit (klass and MDO) stack related information") \
1966 \
1967 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
1968 "Enable LowMemoryProtection")) \
1969 \
1970 product_pd(bool, NeverActAsServerClassMachine, \
1971 "Never act like a server-class machine") \
1972 \
1973 product(bool, AlwaysActAsServerClassMachine, false, \
1974 "Always act like a server-class machine") \
1975 \
1976 product_pd(uint64_t, MaxRAM, \
1977 "Real memory size (in bytes) used to set maximum heap size") \
1978 \
1979 product(uintx, ErgoHeapSizeLimit, 0, \
1980 "Maximum ergonomically set heap size (in bytes); zero means use " \
1981 "MaxRAM / MaxRAMFraction") \
1982 \
1983 product(uintx, MaxRAMFraction, 4, \
1984 "Maximum fraction (1/n) of real memory used for maximum heap " \
1985 "size") \
1986 \
1987 product(uintx, DefaultMaxRAMFraction, 4, \
1988 "Maximum fraction (1/n) of real memory used for maximum heap " \
1989 "size; deprecated: to be renamed to MaxRAMFraction") \
1990 \
1991 product(uintx, MinRAMFraction, 2, \
1992 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1993 "size on systems with small physical memory size") \
1994 \
1995 product(uintx, InitialRAMFraction, 64, \
1996 "Fraction (1/n) of real memory used for initial heap size") \
1997 \
1998 product(bool, UseAutoGCSelectPolicy, false, \
1999 "Use automatic collection selection policy") \
2000 \
2001 product(uintx, AutoGCSelectPauseMillis, 5000, \
2002 "Automatic GC selection pause threshhold in ms") \
2003 \
2004 product(bool, UseAdaptiveSizePolicy, true, \
2005 "Use adaptive generation sizing policies") \
2006 \
2007 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2008 "Use adaptive survivor sizing policies") \
2009 \
2010 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2011 "Use adaptive young-old sizing policies at minor collections") \
2012 \
2013 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2014 "Use adaptive young-old sizing policies at major collections") \
2015 \
2016 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2017 "Use statistics from System.GC for adaptive size policy") \
2018 \
2019 product(bool, UseAdaptiveGCBoundary, false, \
2020 "Allow young-old boundary to move") \
2021 \
2022 develop(bool, TraceAdaptiveGCBoundary, false, \
2023 "Trace young-old boundary moves") \
2024 \
2025 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2026 "Resize the virtual spaces of the young or old generations") \
2027 \
2028 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2029 "Policy for changeing generation size for throughput goals") \
2030 \
2031 product(uintx, AdaptiveSizePausePolicy, 0, \
2032 "Policy for changing generation size for pause goals") \
2033 \
2034 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2035 "Adjust tenured generation to achive a minor pause goal") \
2036 \
2037 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2038 "Adjust young generation to achive a major pause goal") \
2039 \
2040 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2041 "Number of steps where heuristics is used before data is used") \
2042 \
2043 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2044 "Number of collections before the adaptive sizing is started") \
2045 \
2046 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2047 "Collecton interval for printing information; zero => never") \
2048 \
2049 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2050 "Use adaptive minimum footprint as a goal") \
2051 \
2052 product(uintx, AdaptiveSizePolicyWeight, 10, \
2053 "Weight given to exponential resizing, between 0 and 100") \
2054 \
2055 product(uintx, AdaptiveTimeWeight, 25, \
2056 "Weight given to time in adaptive policy, between 0 and 100") \
2057 \
2058 product(uintx, PausePadding, 1, \
2059 "How much buffer to keep for pause time") \
2060 \
2061 product(uintx, PromotedPadding, 3, \
2062 "How much buffer to keep for promotion failure") \
2063 \
2064 product(uintx, SurvivorPadding, 3, \
2065 "How much buffer to keep for survivor overflow") \
2066 \
2067 product(uintx, AdaptivePermSizeWeight, 20, \
2068 "Weight for perm gen exponential resizing, between 0 and 100") \
2069 \
2070 product(uintx, PermGenPadding, 3, \
2071 "How much buffer to keep for perm gen sizing") \
2072 \
2073 product(uintx, ThresholdTolerance, 10, \
2074 "Allowed collection cost difference between generations") \
2075 \
2076 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2077 "If collection costs are within margin, reduce both by full " \
2078 "delta") \
2079 \
2080 product(uintx, YoungGenerationSizeIncrement, 20, \
2081 "Adaptive size percentage change in young generation") \
2082 \
2083 product(uintx, YoungGenerationSizeSupplement, 80, \
2084 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2085 \
2086 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2087 "Decay factor to YoungedGenerationSizeSupplement") \
2088 \
2089 product(uintx, TenuredGenerationSizeIncrement, 20, \
2090 "Adaptive size percentage change in tenured generation") \
2091 \
2092 product(uintx, TenuredGenerationSizeSupplement, 80, \
2093 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2094 \
2095 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2096 "Decay factor to TenuredGenerationSizeIncrement") \
2097 \
2098 product(uintx, MaxGCPauseMillis, max_uintx, \
2099 "Adaptive size policy maximum GC pause time goal in msec, " \
2100 "or (G1 Only) the max. GC time per MMU time slice") \
2101 \
2102 product(uintx, GCPauseIntervalMillis, 0, \
2103 "Time slice for MMU specification") \
2104 \
2105 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2106 "Adaptive size policy maximum GC minor pause time goal in msec") \
2107 \
2108 product(uintx, GCTimeRatio, 99, \
2109 "Adaptive size policy application time to GC time ratio") \
2110 \
2111 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2112 "Adaptive size scale down factor for shrinking") \
2113 \
2114 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2115 "Adaptive size decays the major cost for long major intervals") \
2116 \
2117 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2118 "Time scale over which major costs decay") \
2119 \
2120 product(uintx, MinSurvivorRatio, 3, \
2121 "Minimum ratio of young generation/survivor space size") \
2122 \
2123 product(uintx, InitialSurvivorRatio, 8, \
2124 "Initial ratio of eden/survivor space size") \
2125 \
2126 product(uintx, BaseFootPrintEstimate, 256*M, \
2127 "Estimate of footprint other than Java Heap") \
2128 \
2129 product(bool, UseGCOverheadLimit, true, \
2130 "Use policy to limit of proportion of time spent in GC " \
2131 "before an OutOfMemory error is thrown") \
2132 \
2133 product(uintx, GCTimeLimit, 98, \
2134 "Limit of proportion of time spent in GC before an OutOfMemory" \
2135 "error is thrown (used with GCHeapFreeLimit)") \
2136 \
2137 product(uintx, GCHeapFreeLimit, 2, \
2138 "Minimum percentage of free space after a full GC before an " \
2139 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2140 \
2141 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2142 "Number of consecutive collections before gc time limit fires") \
2143 \
2144 product(bool, PrintAdaptiveSizePolicy, false, \
2145 "Print information about AdaptiveSizePolicy") \
2146 \
2147 product(intx, PrefetchCopyIntervalInBytes, -1, \
2148 "How far ahead to prefetch destination area (<= 0 means off)") \
2149 \
2150 product(intx, PrefetchScanIntervalInBytes, -1, \
2151 "How far ahead to prefetch scan area (<= 0 means off)") \
2152 \
2153 product(intx, PrefetchFieldsAhead, -1, \
2154 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2155 \
2156 develop(bool, UsePrefetchQueue, true, \
2157 "Use the prefetch queue during PS promotion") \
2158 \
2159 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2160 "Verify system before exiting") \
2161 \
2162 diagnostic(bool, VerifyBeforeGC, false, \
2163 "Verify memory system before GC") \
2164 \
2165 diagnostic(bool, VerifyAfterGC, false, \
2166 "Verify memory system after GC") \
2167 \
2168 diagnostic(bool, VerifyDuringGC, false, \
2169 "Verify memory system during GC (between phases)") \
2170 \
2171 diagnostic(bool, GCParallelVerificationEnabled, true, \
2172 "Enable parallel memory system verification") \
2173 \
2174 diagnostic(bool, DeferInitialCardMark, false, \
2175 "When +ReduceInitialCardMarks, explicitly defer any that " \
2176 "may arise from new_pre_store_barrier") \
2177 \
2178 diagnostic(bool, VerifyRememberedSets, false, \
2179 "Verify GC remembered sets") \
2180 \
2181 diagnostic(bool, VerifyObjectStartArray, true, \
2182 "Verify GC object start array if verify before/after") \
2183 \
2184 product(bool, DisableExplicitGC, false, \
2185 "Tells whether calling System.gc() does a full GC") \
2186 \
2187 notproduct(bool, CheckMemoryInitialization, false, \
2188 "Checks memory initialization") \
2189 \
2190 product(bool, CollectGen0First, false, \
2191 "Collect youngest generation before each full GC") \
2192 \
2193 diagnostic(bool, BindCMSThreadToCPU, false, \
2194 "Bind CMS Thread to CPU if possible") \
2195 \
2196 diagnostic(uintx, CPUForCMSThread, 0, \
2197 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2198 \
2199 product(bool, BindGCTaskThreadsToCPUs, false, \
2200 "Bind GCTaskThreads to CPUs if possible") \
2201 \
2202 product(bool, UseGCTaskAffinity, false, \
2203 "Use worker affinity when asking for GCTasks") \
2204 \
2205 product(uintx, ProcessDistributionStride, 4, \
2206 "Stride through processors when distributing processes") \
2207 \
2208 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2209 "number of times the coordinator GC thread will sleep while " \
2210 "yielding before giving up and resuming GC") \
2211 \
2212 product(uintx, CMSYieldSleepCount, 0, \
2213 "number of times a GC thread (minus the coordinator) " \
2214 "will sleep while yielding before giving up and resuming GC") \
2215 \
2216 /* gc tracing */ \
2217 manageable(bool, PrintGC, false, \
2218 "Print message at garbage collect") \
2219 \
2220 manageable(bool, PrintGCDetails, false, \
2221 "Print more details at garbage collect") \
2222 \
2223 manageable(bool, PrintGCDateStamps, false, \
2224 "Print date stamps at garbage collect") \
2225 \
2226 manageable(bool, PrintGCTimeStamps, false, \
2227 "Print timestamps at garbage collect") \
2228 \
2229 product(bool, PrintGCTaskTimeStamps, false, \
2230 "Print timestamps for individual gc worker thread tasks") \
2231 \
2232 develop(intx, ConcGCYieldTimeout, 0, \
2233 "If non-zero, assert that GC threads yield within this # of ms.") \
2234 \
2235 notproduct(bool, TraceMarkSweep, false, \
2236 "Trace mark sweep") \
2237 \
2238 product(bool, PrintReferenceGC, false, \
2239 "Print times spent handling reference objects during GC " \
2240 " (enabled only when PrintGCDetails)") \
2241 \
2242 develop(bool, TraceReferenceGC, false, \
2243 "Trace handling of soft/weak/final/phantom references") \
2244 \
2245 develop(bool, TraceFinalizerRegistration, false, \
2246 "Trace registration of final references") \
2247 \
2248 notproduct(bool, TraceScavenge, false, \
2249 "Trace scavenge") \
2250 \
2251 product_rw(bool, TraceClassLoading, false, \
2252 "Trace all classes loaded") \
2253 \
2254 product(bool, TraceClassLoadingPreorder, false, \
2255 "Trace all classes loaded in order referenced (not loaded)") \
2256 \
2257 product_rw(bool, TraceClassUnloading, false, \
2258 "Trace unloading of classes") \
2259 \
2260 product_rw(bool, TraceLoaderConstraints, false, \
2261 "Trace loader constraints") \
2262 \
2263 product(bool, TraceGen0Time, false, \
2264 "Trace accumulated time for Gen 0 collection") \
2265 \
2266 product(bool, TraceGen1Time, false, \
2267 "Trace accumulated time for Gen 1 collection") \
2268 \
2269 product(bool, PrintTenuringDistribution, false, \
2270 "Print tenuring age information") \
2271 \
2272 product_rw(bool, PrintHeapAtGC, false, \
2273 "Print heap layout before and after each GC") \
2274 \
2275 product_rw(bool, PrintHeapAtGCExtended, false, \
2276 "Prints extended information about the layout of the heap " \
2277 "when -XX:+PrintHeapAtGC is set") \
2278 \
2279 product(bool, PrintHeapAtSIGBREAK, true, \
2280 "Print heap layout in response to SIGBREAK") \
2281 \
2282 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2283 "Print a class histogram before any major stop-world GC") \
2284 \
2285 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2286 "Print a class histogram after any major stop-world GC") \
2287 \
2288 manageable(bool, PrintClassHistogram, false, \
2289 "Print a histogram of class instances") \
2290 \
2291 develop(bool, TraceWorkGang, false, \
2292 "Trace activities of work gangs") \
2293 \
2294 product(bool, TraceParallelOldGCTasks, false, \
2295 "Trace multithreaded GC activity") \
2296 \
2297 develop(bool, TraceBlockOffsetTable, false, \
2298 "Print BlockOffsetTable maps") \
2299 \
2300 develop(bool, TraceCardTableModRefBS, false, \
2301 "Print CardTableModRefBS maps") \
2302 \
2303 develop(bool, TraceGCTaskManager, false, \
2304 "Trace actions of the GC task manager") \
2305 \
2306 develop(bool, TraceGCTaskQueue, false, \
2307 "Trace actions of the GC task queues") \
2308 \
2309 develop(bool, TraceGCTaskThread, false, \
2310 "Trace actions of the GC task threads") \
2311 \
2312 product(bool, PrintParallelOldGCPhaseTimes, false, \
2313 "Print the time taken by each parallel old gc phase." \
2314 "PrintGCDetails must also be enabled.") \
2315 \
2316 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2317 "Trace parallel old gc marking phase") \
2318 \
2319 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2320 "Trace parallel old gc summary phase") \
2321 \
2322 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2323 "Trace parallel old gc compaction phase") \
2324 \
2325 develop(bool, TraceParallelOldGCDensePrefix, false, \
2326 "Trace parallel old gc dense prefix computation") \
2327 \
2328 develop(bool, IgnoreLibthreadGPFault, false, \
2329 "Suppress workaround for libthread GP fault") \
2330 \
2331 product(bool, PrintJNIGCStalls, false, \
2332 "Print diagnostic message when GC is stalled" \
2333 "by JNI critical section") \
2334 \
2335 /* JVMTI heap profiling */ \
2336 \
2337 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2338 "Trace JVMTI object tagging calls") \
2339 \
2340 diagnostic(bool, VerifyBeforeIteration, false, \
2341 "Verify memory system before JVMTI iteration") \
2342 \
2343 /* compiler interface */ \
2344 \
2345 develop(bool, CIPrintCompilerName, false, \
2346 "when CIPrint is active, print the name of the active compiler") \
2347 \
2348 develop(bool, CIPrintCompileQueue, false, \
2349 "display the contents of the compile queue whenever a " \
2350 "compilation is enqueued") \
2351 \
2352 develop(bool, CIPrintRequests, false, \
2353 "display every request for compilation") \
2354 \
2355 product(bool, CITime, false, \
2356 "collect timing information for compilation") \
2357 \
2358 develop(bool, CITimeEach, false, \
2359 "display timing information after each successful compilation") \
2360 \
2361 develop(bool, CICountOSR, true, \
2362 "use a separate counter when assigning ids to osr compilations") \
2363 \
2364 develop(bool, CICompileNatives, true, \
2365 "compile native methods if supported by the compiler") \
2366 \
2367 develop_pd(bool, CICompileOSR, \
2368 "compile on stack replacement methods if supported by the " \
2369 "compiler") \
2370 \
2371 develop(bool, CIPrintMethodCodes, false, \
2372 "print method bytecodes of the compiled code") \
2373 \
2374 develop(bool, CIPrintTypeFlow, false, \
2375 "print the results of ciTypeFlow analysis") \
2376 \
2377 develop(bool, CITraceTypeFlow, false, \
2378 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2379 \
2380 develop(intx, CICloneLoopTestLimit, 100, \
2381 "size limit for blocks heuristically cloned in ciTypeFlow") \
2382 \
2383 develop(intx, OSROnlyBCI, -1, \
2384 "OSR only at this bci. Negative values mean exclude that bci") \
2385 \
2386 /* temp diagnostics */ \
2387 \
2388 diagnostic(bool, TraceRedundantCompiles, false, \
2389 "Have compile broker print when a request already in the queue is"\
2390 " requested again") \
2391 \
2392 diagnostic(bool, InitialCompileFast, false, \
2393 "Initial compile at CompLevel_fast_compile") \
2394 \
2395 diagnostic(bool, InitialCompileReallyFast, false, \
2396 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2397 \
2398 diagnostic(bool, FullProfileOnReInterpret, true, \
2399 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2400 \
2401 /* compiler */ \
2402 \
2403 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2404 "Number of compiler threads to run") \
2405 \
2406 product(intx, CompilationPolicyChoice, 0, \
2407 "which compilation policy (0/1)") \
2408 \
2409 develop(bool, UseStackBanging, true, \
2410 "use stack banging for stack overflow checks (required for " \
2411 "proper StackOverflow handling; disable only to measure cost " \
2412 "of stackbanging)") \
2413 \
2414 develop(bool, Use24BitFPMode, true, \
2415 "Set 24-bit FPU mode on a per-compile basis ") \
2416 \
2417 develop(bool, Use24BitFP, true, \
2418 "use FP instructions that produce 24-bit precise results") \
2419 \
2420 develop(bool, UseStrictFP, true, \
2421 "use strict fp if modifier strictfp is set") \
2422 \
2423 develop(bool, GenerateSynchronizationCode, true, \
2424 "generate locking/unlocking code for synchronized methods and " \
2425 "monitors") \
2426 \
2427 develop(bool, GenerateCompilerNullChecks, true, \
2428 "Generate explicit null checks for loads/stores/calls") \
2429 \
2430 develop(bool, GenerateRangeChecks, true, \
2431 "Generate range checks for array accesses") \
2432 \
2433 develop_pd(bool, ImplicitNullChecks, \
2434 "generate code for implicit null checks") \
2435 \
2436 product(bool, PrintSafepointStatistics, false, \
2437 "print statistics about safepoint synchronization") \
2438 \
2439 product(intx, PrintSafepointStatisticsCount, 300, \
2440 "total number of safepoint statistics collected " \
2441 "before printing them out") \
2442 \
2443 product(intx, PrintSafepointStatisticsTimeout, -1, \
2444 "print safepoint statistics only when safepoint takes" \
2445 " more than PrintSafepointSatisticsTimeout in millis") \
2446 \
2447 product(bool, TraceSafepointCleanupTime, false, \
2448 "print the break down of clean up tasks performed during" \
2449 " safepoint") \
2450 \
2451 develop(bool, InlineAccessors, true, \
2452 "inline accessor methods (get/set)") \
2453 \
2454 product(bool, Inline, true, \
2455 "enable inlining") \
2456 \
2457 product(bool, ClipInlining, true, \
2458 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2459 \
2460 develop(bool, UseCHA, true, \
2461 "enable CHA") \
2462 \
2463 product(bool, UseTypeProfile, true, \
2464 "Check interpreter profile for historically monomorphic calls") \
2465 \
2466 product(intx, TypeProfileMajorReceiverPercent, 90, \
2467 "% of major receiver type to all profiled receivers") \
2468 \
2469 notproduct(bool, TimeCompiler, false, \
2470 "time the compiler") \
2471 \
2472 notproduct(bool, TimeCompiler2, false, \
2473 "detailed time the compiler (requires +TimeCompiler)") \
2474 \
2475 diagnostic(bool, PrintInlining, false, \
2476 "prints inlining optimizations") \
2477 \
2478 diagnostic(bool, PrintIntrinsics, false, \
2479 "prints attempted and successful inlining of intrinsics") \
2480 \
2481 product(bool, UseCountLeadingZerosInstruction, false, \
2482 "Use count leading zeros instruction") \
2483 \
2484 product(bool, UsePopCountInstruction, false, \
2485 "Use population count instruction") \
2486 \
2487 diagnostic(ccstrlist, DisableIntrinsic, "", \
2488 "do not expand intrinsics whose (internal) names appear here") \
2489 \
2490 develop(bool, StressReflectiveCode, false, \
2491 "Use inexact types at allocations, etc., to test reflection") \
2492 \
2493 develop(bool, EagerInitialization, false, \
2494 "Eagerly initialize classes if possible") \
2495 \
2496 develop(bool, TraceMethodReplacement, false, \
2497 "Print when methods are replaced do to recompilation") \
2498 \
2499 develop(bool, PrintMethodFlushing, false, \
2500 "print the nmethods being flushed") \
2501 \
2502 notproduct(bool, LogMultipleMutexLocking, false, \
2503 "log locking and unlocking of mutexes (only if multiple locks " \
2504 "are held)") \
2505 \
2506 develop(bool, UseRelocIndex, false, \
2507 "use an index to speed random access to relocations") \
2508 \
2509 develop(bool, StressCodeBuffers, false, \
2510 "Exercise code buffer expansion and other rare state changes") \
2511 \
2512 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2513 "Generate extra debugging info for non-safepoints in nmethods") \
2514 \
2515 diagnostic(bool, DebugInlinedCalls, true, \
2516 "If false, restricts profiled locations to the root method only") \
2517 \
2518 product(bool, PrintVMOptions, trueInDebug, \
2519 "Print flags that appeared on the command line") \
2520 \
2521 product(bool, IgnoreUnrecognizedVMOptions, false, \
2522 "Ignore unrecognized VM options") \
2523 \
2524 product(bool, PrintCommandLineFlags, false, \
2525 "Print flags specified on command line or set by ergonomics") \
2526 \
2527 product(bool, PrintFlagsInitial, false, \
2528 "Print all VM flags before argument processing and exit VM") \
2529 \
2530 product(bool, PrintFlagsFinal, false, \
2531 "Print all VM flags after argument and ergonomic processing") \
2532 \
2533 notproduct(bool, PrintFlagsWithComments, false, \
2534 "Print all VM flags with default values and descriptions and exit")\
2535 \
2536 diagnostic(bool, SerializeVMOutput, true, \
2537 "Use a mutex to serialize output to tty and hotspot.log") \
2538 \
2539 diagnostic(bool, DisplayVMOutput, true, \
2540 "Display all VM output on the tty, independently of LogVMOutput") \
2541 \
2542 diagnostic(bool, LogVMOutput, trueInDebug, \
2543 "Save VM output to hotspot.log, or to LogFile") \
2544 \
2545 diagnostic(ccstr, LogFile, NULL, \
2546 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2547 \
2548 product(ccstr, ErrorFile, NULL, \
2549 "If an error occurs, save the error data to this file " \
2550 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2551 \
2552 product(bool, DisplayVMOutputToStderr, false, \
2553 "If DisplayVMOutput is true, display all VM output to stderr") \
2554 \
2555 product(bool, DisplayVMOutputToStdout, false, \
2556 "If DisplayVMOutput is true, display all VM output to stdout") \
2557 \
2558 product(bool, UseHeavyMonitors, false, \
2559 "use heavyweight instead of lightweight Java monitors") \
2560 \
2561 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2562 "print histogram of the symbol table") \
2563 \
2564 notproduct(bool, ExitVMOnVerifyError, false, \
2565 "standard exit from VM if bytecode verify error " \
2566 "(only in debug mode)") \
2567 \
2568 notproduct(ccstr, AbortVMOnException, NULL, \
2569 "Call fatal if this exception is thrown. Example: " \
2570 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2571 \
2572 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2573 "Call fatal if the exception pointed by AbortVMOnException " \
2574 "has this message.") \
2575 \
2576 develop(bool, DebugVtables, false, \
2577 "add debugging code to vtable dispatch") \
2578 \
2579 develop(bool, PrintVtables, false, \
2580 "print vtables when printing klass") \
2581 \
2582 notproduct(bool, PrintVtableStats, false, \
2583 "print vtables stats at end of run") \
2584 \
2585 develop(bool, TraceCreateZombies, false, \
2586 "trace creation of zombie nmethods") \
2587 \
2588 notproduct(bool, IgnoreLockingAssertions, false, \
2589 "disable locking assertions (for speed)") \
2590 \
2591 notproduct(bool, VerifyLoopOptimizations, false, \
2592 "verify major loop optimizations") \
2593 \
2594 product(bool, RangeCheckElimination, true, \
2595 "Split loop iterations to eliminate range checks") \
2596 \
2597 develop_pd(bool, UncommonNullCast, \
2598 "track occurrences of null in casts; adjust compiler tactics") \
2599 \
2600 develop(bool, TypeProfileCasts, true, \
2601 "treat casts like calls for purposes of type profiling") \
2602 \
2603 develop(bool, MonomorphicArrayCheck, true, \
2604 "Uncommon-trap array store checks that require full type check") \
2605 \
2606 diagnostic(bool, ProfileDynamicTypes, true, \
2607 "do extra type profiling and use it more aggressively") \
2608 \
2609 develop(bool, DelayCompilationDuringStartup, true, \
2610 "Delay invoking the compiler until main application class is " \
2611 "loaded") \
2612 \
2613 develop(bool, CompileTheWorld, false, \
2614 "Compile all methods in all classes in bootstrap class path " \
2615 "(stress test)") \
2616 \
2617 develop(bool, CompileTheWorldPreloadClasses, true, \
2618 "Preload all classes used by a class before start loading") \
2619 \
2620 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2621 "Force a safepoint every n compiles so sweeper can keep up") \
2622 \
2623 develop(bool, TraceIterativeGVN, false, \
2624 "Print progress during Iterative Global Value Numbering") \
2625 \
2626 develop(bool, FillDelaySlots, true, \
2627 "Fill delay slots (on SPARC only)") \
2628 \
2629 develop(bool, VerifyIterativeGVN, false, \
2630 "Verify Def-Use modifications during sparse Iterative Global " \
2631 "Value Numbering") \
2632 \
2633 notproduct(bool, TracePhaseCCP, false, \
2634 "Print progress during Conditional Constant Propagation") \
2635 \
2636 develop(bool, TimeLivenessAnalysis, false, \
2637 "Time computation of bytecode liveness analysis") \
2638 \
2639 develop(bool, TraceLivenessGen, false, \
2640 "Trace the generation of liveness analysis information") \
2641 \
2642 notproduct(bool, TraceLivenessQuery, false, \
2643 "Trace queries of liveness analysis information") \
2644 \
2645 notproduct(bool, CollectIndexSetStatistics, false, \
2646 "Collect information about IndexSets") \
2647 \
2648 develop(bool, PrintDominators, false, \
2649 "Print out dominator trees for GVN") \
2650 \
2651 develop(bool, UseLoopSafepoints, true, \
2652 "Generate Safepoint nodes in every loop") \
2653 \
2654 notproduct(bool, TraceCISCSpill, false, \
2655 "Trace allocators use of cisc spillable instructions") \
2656 \
2657 notproduct(bool, TraceSpilling, false, \
2658 "Trace spilling") \
2659 \
2660 product(bool, SplitIfBlocks, true, \
2661 "Clone compares and control flow through merge points to fold " \
2662 "some branches") \
2663 \
2664 develop(intx, FastAllocateSizeLimit, 128*K, \
2665 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2666 "Inline allocations larger than this in doublewords must go slow")\
2667 \
2668 product(bool, AggressiveOpts, false, \
2669 "Enable aggressive optimizations - see arguments.cpp") \
2670 \
2671 product(bool, UseStringCache, false, \
2672 "Enable String cache capabilities on String.java") \
2673 \
2674 /* statistics */ \
2675 develop(bool, CountCompiledCalls, false, \
2676 "counts method invocations") \
2677 \
2678 notproduct(bool, CountRuntimeCalls, false, \
2679 "counts VM runtime calls") \
2680 \
2681 develop(bool, CountJNICalls, false, \
2682 "counts jni method invocations") \
2683 \
2684 notproduct(bool, CountJVMCalls, false, \
2685 "counts jvm method invocations") \
2686 \
2687 notproduct(bool, CountRemovableExceptions, false, \
2688 "count exceptions that could be replaced by branches due to " \
2689 "inlining") \
2690 \
2691 notproduct(bool, ICMissHistogram, false, \
2692 "produce histogram of IC misses") \
2693 \
2694 notproduct(bool, PrintClassStatistics, false, \
2695 "prints class statistics at end of run") \
2696 \
2697 notproduct(bool, PrintMethodStatistics, false, \
2698 "prints method statistics at end of run") \
2699 \
2700 /* interpreter */ \
2701 develop(bool, ClearInterpreterLocals, false, \
2702 "Always clear local variables of interpreter activations upon " \
2703 "entry") \
2704 \
2705 product_pd(bool, RewriteBytecodes, \
2706 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2707 \
2708 product_pd(bool, RewriteFrequentPairs, \
2709 "Rewrite frequently used bytecode pairs into a single bytecode") \
2710 \
2711 diagnostic(bool, PrintInterpreter, false, \
2712 "Prints the generated interpreter code") \
2713 \
2714 product(bool, UseInterpreter, true, \
2715 "Use interpreter for non-compiled methods") \
2716 \
2717 develop(bool, UseFastSignatureHandlers, true, \
2718 "Use fast signature handlers for native calls") \
2719 \
2720 develop(bool, UseV8InstrsOnly, false, \
2721 "Use SPARC-V8 Compliant instruction subset") \
2722 \
2723 product(bool, UseNiagaraInstrs, false, \
2724 "Use Niagara-efficient instruction subset") \
2725 \
2726 develop(bool, UseCASForSwap, false, \
2727 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2728 \
2729 product(bool, UseLoopCounter, true, \
2730 "Increment invocation counter on backward branch") \
2731 \
2732 product(bool, UseFastEmptyMethods, true, \
2733 "Use fast method entry code for empty methods") \
2734 \
2735 product(bool, UseFastAccessorMethods, true, \
2736 "Use fast method entry code for accessor methods") \
2737 \
2738 product_pd(bool, UseOnStackReplacement, \
2739 "Use on stack replacement, calls runtime if invoc. counter " \
2740 "overflows in loop") \
2741 \
2742 notproduct(bool, TraceOnStackReplacement, false, \
2743 "Trace on stack replacement") \
2744 \
2745 develop(bool, PoisonOSREntry, true, \
2746 "Detect abnormal calls to OSR code") \
2747 \
2748 product_pd(bool, PreferInterpreterNativeStubs, \
2749 "Use always interpreter stubs for native methods invoked via " \
2750 "interpreter") \
2751 \
2752 develop(bool, CountBytecodes, false, \
2753 "Count number of bytecodes executed") \
2754 \
2755 develop(bool, PrintBytecodeHistogram, false, \
2756 "Print histogram of the executed bytecodes") \
2757 \
2758 develop(bool, PrintBytecodePairHistogram, false, \
2759 "Print histogram of the executed bytecode pairs") \
2760 \
2761 diagnostic(bool, PrintSignatureHandlers, false, \
2762 "Print code generated for native method signature handlers") \
2763 \
2764 develop(bool, VerifyOops, false, \
2765 "Do plausibility checks for oops") \
2766 \
2767 develop(bool, CheckUnhandledOops, false, \
2768 "Check for unhandled oops in VM code") \
2769 \
2770 develop(bool, VerifyJNIFields, trueInDebug, \
2771 "Verify jfieldIDs for instance fields") \
2772 \
2773 notproduct(bool, VerifyJNIEnvThread, false, \
2774 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2775 "from JNI") \
2776 \
2777 develop(bool, VerifyFPU, false, \
2778 "Verify FPU state (check for NaN's, etc.)") \
2779 \
2780 develop(bool, VerifyThread, false, \
2781 "Watch the thread register for corruption (SPARC only)") \
2782 \
2783 develop(bool, VerifyActivationFrameSize, false, \
2784 "Verify that activation frame didn't become smaller than its " \
2785 "minimal size") \
2786 \
2787 develop(bool, TraceFrequencyInlining, false, \
2788 "Trace frequency based inlining") \
2789 \
2790 notproduct(bool, TraceTypeProfile, false, \
2791 "Trace type profile") \
2792 \
2793 develop_pd(bool, InlineIntrinsics, \
2794 "Inline intrinsics that can be statically resolved") \
2795 \
2796 product_pd(bool, ProfileInterpreter, \
2797 "Profile at the bytecode level during interpretation") \
2798 \
2799 develop_pd(bool, ProfileTraps, \
2800 "Profile deoptimization traps at the bytecode level") \
2801 \
2802 product(intx, ProfileMaturityPercentage, 20, \
2803 "number of method invocations/branches (expressed as % of " \
2804 "CompileThreshold) before using the method's profile") \
2805 \
2806 develop(bool, PrintMethodData, false, \
2807 "Print the results of +ProfileInterpreter at end of run") \
2808 \
2809 develop(bool, VerifyDataPointer, trueInDebug, \
2810 "Verify the method data pointer during interpreter profiling") \
2811 \
2812 develop(bool, VerifyCompiledCode, false, \
2813 "Include miscellaneous runtime verifications in nmethod code; " \
2814 "default off because it disturbs nmethod size heuristics") \
2815 \
2816 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2817 "Manually make GC thread crash then dump java stack trace; " \
2818 "Test only") \
2819 \
2820 /* compilation */ \
2821 product(bool, UseCompiler, true, \
2822 "use compilation") \
2823 \
2824 develop(bool, TraceCompilationPolicy, false, \
2825 "Trace compilation policy") \
2826 \
2827 develop(bool, TimeCompilationPolicy, false, \
2828 "Time the compilation policy") \
2829 \
2830 product(bool, UseCounterDecay, true, \
2831 "adjust recompilation counters") \
2832 \
2833 develop(intx, CounterHalfLifeTime, 30, \
2834 "half-life time of invocation counters (in secs)") \
2835 \
2836 develop(intx, CounterDecayMinIntervalLength, 500, \
2837 "Min. ms. between invocation of CounterDecay") \
2838 \
2839 product(bool, AlwaysCompileLoopMethods, false, \
2840 "when using recompilation, never interpret methods " \
2841 "containing loops") \
2842 \
2843 product(bool, DontCompileHugeMethods, true, \
2844 "don't compile methods > HugeMethodLimit") \
2845 \
2846 /* Bytecode escape analysis estimation. */ \
2847 product(bool, EstimateArgEscape, true, \
2848 "Analyze bytecodes to estimate escape state of arguments") \
2849 \
2850 product(intx, BCEATraceLevel, 0, \
2851 "How much tracing to do of bytecode escape analysis estimates") \
2852 \
2853 product(intx, MaxBCEAEstimateLevel, 5, \
2854 "Maximum number of nested calls that are analyzed by BC EA.") \
2855 \
2856 product(intx, MaxBCEAEstimateSize, 150, \
2857 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2858 \
2859 product(intx, AllocatePrefetchStyle, 1, \
2860 "0 = no prefetch, " \
2861 "1 = prefetch instructions for each allocation, " \
2862 "2 = use TLAB watermark to gate allocation prefetch, " \
2863 "3 = use BIS instruction on Sparc for allocation prefetch") \
2864 \
2865 product(intx, AllocatePrefetchDistance, -1, \
2866 "Distance to prefetch ahead of allocation pointer") \
2867 \
2868 product(intx, AllocatePrefetchLines, 1, \
2869 "Number of lines to prefetch ahead of allocation pointer") \
2870 \
2871 product(intx, AllocatePrefetchStepSize, 16, \
2872 "Step size in bytes of sequential prefetch instructions") \
2873 \
2874 product(intx, AllocatePrefetchInstr, 0, \
2875 "Prefetch instruction to prefetch ahead of allocation pointer") \
2876 \
2877 product(intx, ReadPrefetchInstr, 0, \
2878 "Prefetch instruction to prefetch ahead") \
2879 \
2880 /* deoptimization */ \
2881 develop(bool, TraceDeoptimization, false, \
2882 "Trace deoptimization") \
2883 \
2884 develop(bool, DebugDeoptimization, false, \
2885 "Tracing various information while debugging deoptimization") \
2886 \
2887 product(intx, SelfDestructTimer, 0, \
2888 "Will cause VM to terminate after a given time (in minutes) " \
2889 "(0 means off)") \
2890 \
2891 product(intx, MaxJavaStackTraceDepth, 1024, \
2892 "Max. no. of lines in the stack trace for Java exceptions " \
2893 "(0 means all)") \
2894 \
2895 NOT_EMBEDDED(develop(intx, GuaranteedSafepointInterval, 1000, \
2896 "Guarantee a safepoint (at least) every so many milliseconds " \
2897 "(0 means none)")) \
2898 \
2899 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2900 "Guarantee a safepoint (at least) every so many milliseconds " \
2901 "(0 means none)")) \
2902 \
2903 product(intx, SafepointTimeoutDelay, 10000, \
2904 "Delay in milliseconds for option SafepointTimeout") \
2905 \
2906 product(intx, NmethodSweepFraction, 4, \
2907 "Number of invocations of sweeper to cover all nmethods") \
2908 \
2909 product(intx, NmethodSweepCheckInterval, 5, \
2910 "Compilers wake up every n seconds to possibly sweep nmethods") \
2911 \
2912 notproduct(intx, MemProfilingInterval, 500, \
2913 "Time between each invocation of the MemProfiler") \
2914 \
2915 develop(intx, MallocCatchPtr, -1, \
2916 "Hit breakpoint when mallocing/freeing this pointer") \
2917 \
2918 notproduct(intx, AssertRepeat, 1, \
2919 "number of times to evaluate expression in assert " \
2920 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2921 \
2922 notproduct(ccstrlist, SuppressErrorAt, "", \
2923 "List of assertions (file:line) to muzzle") \
2924 \
2925 notproduct(uintx, HandleAllocationLimit, 1024, \
2926 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2927 "is used") \
2928 \
2929 develop(uintx, TotalHandleAllocationLimit, 1024, \
2930 "Threshold for total handle allocation when " \
2931 "+TraceHandleAllocation is used") \
2932 \
2933 develop(intx, StackPrintLimit, 100, \
2934 "number of stack frames to print in VM-level stack dump") \
2935 \
2936 notproduct(intx, MaxElementPrintSize, 256, \
2937 "maximum number of elements to print") \
2938 \
2939 notproduct(intx, MaxSubklassPrintSize, 4, \
2940 "maximum number of subklasses to print when printing klass") \
2941 \
2942 product(intx, MaxInlineLevel, 9, \
2943 "maximum number of nested calls that are inlined") \
2944 \
2945 product(intx, MaxRecursiveInlineLevel, 1, \
2946 "maximum number of nested recursive calls that are inlined") \
2947 \
2948 product_pd(intx, InlineSmallCode, \
2949 "Only inline already compiled methods if their code size is " \
2950 "less than this") \
2951 \
2952 product(intx, MaxInlineSize, 35, \
2953 "maximum bytecode size of a method to be inlined") \
2954 \
2955 product_pd(intx, FreqInlineSize, \
2956 "maximum bytecode size of a frequent method to be inlined") \
2957 \
2958 product(intx, MaxTrivialSize, 6, \
2959 "maximum bytecode size of a trivial method to be inlined") \
2960 \
2961 product(intx, MinInliningThreshold, 250, \
2962 "min. invocation count a method needs to have to be inlined") \
2963 \
2964 develop(intx, AlignEntryCode, 4, \
2965 "aligns entry code to specified value (in bytes)") \
2966 \
2967 develop(intx, MethodHistogramCutoff, 100, \
2968 "cutoff value for method invoc. histogram (+CountCalls)") \
2969 \
2970 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2971 "# of interpreted methods to show in profile") \
2972 \
2973 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2974 "# of compiled methods to show in profile") \
2975 \
2976 develop(intx, ProfilerNumberOfStubMethods, 25, \
2977 "# of stub methods to show in profile") \
2978 \
2979 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2980 "# of runtime stub nodes to show in profile") \
2981 \
2982 product(intx, ProfileIntervalsTicks, 100, \
2983 "# of ticks between printing of interval profile " \
2984 "(+ProfileIntervals)") \
2985 \
2986 notproduct(intx, ScavengeALotInterval, 1, \
2987 "Interval between which scavenge will occur with +ScavengeALot") \
2988 \
2989 notproduct(intx, FullGCALotInterval, 1, \
2990 "Interval between which full gc will occur with +FullGCALot") \
2991 \
2992 notproduct(intx, FullGCALotStart, 0, \
2993 "For which invocation to start FullGCAlot") \
2994 \
2995 notproduct(intx, FullGCALotDummies, 32*K, \
2996 "Dummy object allocated with +FullGCALot, forcing all objects " \
2997 "to move") \
2998 \
2999 develop(intx, DontYieldALotInterval, 10, \
3000 "Interval between which yields will be dropped (milliseconds)") \
3001 \
3002 develop(intx, MinSleepInterval, 1, \
3003 "Minimum sleep() interval (milliseconds) when " \
3004 "ConvertSleepToYield is off (used for SOLARIS)") \
3005 \
3006 product(intx, EventLogLength, 2000, \
3007 "maximum nof events in event log") \
3008 \
3009 develop(intx, ProfilerPCTickThreshold, 15, \
3010 "Number of ticks in a PC buckets to be a hotspot") \
3011 \
3012 notproduct(intx, DeoptimizeALotInterval, 5, \
3013 "Number of exits until DeoptimizeALot kicks in") \
3014 \
3015 notproduct(intx, ZombieALotInterval, 5, \
3016 "Number of exits until ZombieALot kicks in") \
3017 \
3018 develop(bool, StressNonEntrant, false, \
3019 "Mark nmethods non-entrant at registration") \
3020 \
3021 diagnostic(intx, MallocVerifyInterval, 0, \
3022 "if non-zero, verify C heap after every N calls to " \
3023 "malloc/realloc/free") \
3024 \
3025 diagnostic(intx, MallocVerifyStart, 0, \
3026 "if non-zero, start verifying C heap after Nth call to " \
3027 "malloc/realloc/free") \
3028 \
3029 product(intx, TypeProfileWidth, 2, \
3030 "number of receiver types to record in call/cast profile") \
3031 \
3032 develop(intx, BciProfileWidth, 2, \
3033 "number of return bci's to record in ret profile") \
3034 \
3035 product(intx, PerMethodRecompilationCutoff, 400, \
3036 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3037 \
3038 product(intx, PerBytecodeRecompilationCutoff, 200, \
3039 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3040 \
3041 product(intx, PerMethodTrapLimit, 100, \
3042 "Limit on traps (of one kind) in a method (includes inlines)") \
3043 \
3044 product(intx, PerBytecodeTrapLimit, 4, \
3045 "Limit on traps (of one kind) at a particular BCI") \
3046 \
3047 develop(intx, FreqCountInvocations, 1, \
3048 "Scaling factor for branch frequencies (deprecated)") \
3049 \
3050 develop(intx, InlineFrequencyRatio, 20, \
3051 "Ratio of call site execution to caller method invocation") \
3052 \
3053 develop_pd(intx, InlineFrequencyCount, \
3054 "Count of call site execution necessary to trigger frequent " \
3055 "inlining") \
3056 \
3057 develop(intx, InlineThrowCount, 50, \
3058 "Force inlining of interpreted methods that throw this often") \
3059 \
3060 develop(intx, InlineThrowMaxSize, 200, \
3061 "Force inlining of throwing methods smaller than this") \
3062 \
3063 product(intx, AliasLevel, 3, \
3064 "0 for no aliasing, 1 for oop/field/static/array split, " \
3065 "2 for class split, 3 for unique instances") \
3066 \
3067 develop(bool, VerifyAliases, false, \
3068 "perform extra checks on the results of alias analysis") \
3069 \
3070 develop(intx, ProfilerNodeSize, 1024, \
3071 "Size in K to allocate for the Profile Nodes of each thread") \
3072 \
3073 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
3074 "Number of times to spin wait on a v8 atomic operation lock") \
3075 \
3076 product(intx, ReadSpinIterations, 100, \
3077 "Number of read attempts before a yield (spin inner loop)") \
3078 \
3079 product_pd(intx, PreInflateSpin, \
3080 "Number of times to spin wait before inflation") \
3081 \
3082 product(intx, PreBlockSpin, 10, \
3083 "Number of times to spin in an inflated lock before going to " \
3084 "an OS lock") \
3085 \
3086 /* gc parameters */ \
3087 product(uintx, InitialHeapSize, 0, \
3088 "Initial heap size (in bytes); zero means OldSize + NewSize") \
3089 \
3090 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3091 "Maximum heap size (in bytes)") \
3092 \
3093 product(uintx, OldSize, ScaleForWordSize(4*M), \
3094 "Initial tenured generation size (in bytes)") \
3095 \
3096 product(uintx, NewSize, ScaleForWordSize(1*M), \
3097 "Initial new generation size (in bytes)") \
3098 \
3099 product(uintx, MaxNewSize, max_uintx, \
3100 "Maximum new generation size (in bytes), max_uintx means set " \
3101 "ergonomically") \
3102 \
3103 product(uintx, PretenureSizeThreshold, 0, \
3104 "Maximum size in bytes of objects allocated in DefNew " \
3105 "generation; zero means no maximum") \
3106 \
3107 product(uintx, TLABSize, 0, \
3108 "Starting TLAB size (in bytes); zero means set ergonomically") \
3109 \
3110 product(uintx, MinTLABSize, 2*K, \
3111 "Minimum allowed TLAB size (in bytes)") \
3112 \
3113 product(uintx, TLABAllocationWeight, 35, \
3114 "Allocation averaging weight") \
3115 \
3116 product(uintx, TLABWasteTargetPercent, 1, \
3117 "Percentage of Eden that can be wasted") \
3118 \
3119 product(uintx, TLABRefillWasteFraction, 64, \
3120 "Max TLAB waste at a refill (internal fragmentation)") \
3121 \
3122 product(uintx, TLABWasteIncrement, 4, \
3123 "Increment allowed waste at slow allocation") \
3124 \
3125 product(intx, SurvivorRatio, 8, \
3126 "Ratio of eden/survivor space size") \
3127 \
3128 product(intx, NewRatio, 2, \
3129 "Ratio of new/old generation sizes") \
3130 \
3131 product_pd(uintx, NewSizeThreadIncrease, \
3132 "Additional size added to desired new generation size per " \
3133 "non-daemon thread (in bytes)") \
3134 \
3135 product_pd(uintx, PermSize, \
3136 "Initial size of permanent generation (in bytes)") \
3137 \
3138 product_pd(uintx, MaxPermSize, \
3139 "Maximum size of permanent generation (in bytes)") \
3140 \
3141 product(uintx, MinHeapFreeRatio, 40, \
3142 "Min percentage of heap free after GC to avoid expansion") \
3143 \
3144 product(uintx, MaxHeapFreeRatio, 70, \
3145 "Max percentage of heap free after GC to avoid shrinking") \
3146 \
3147 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3148 "Number of milliseconds per MB of free space in the heap") \
3149 \
3150 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3151 "Min change in heap space due to GC (in bytes)") \
3152 \
3153 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
3154 "Min expansion of permanent heap (in bytes)") \
3155 \
3156 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3157 "Max expansion of permanent heap without full GC (in bytes)") \
3158 \
3159 product(intx, QueuedAllocationWarningCount, 0, \
3160 "Number of times an allocation that queues behind a GC " \
3161 "will retry before printing a warning") \
3162 \
3163 diagnostic(uintx, VerifyGCStartAt, 0, \
3164 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3165 \
3166 diagnostic(intx, VerifyGCLevel, 0, \
3167 "Generation level at which to start +VerifyBefore/AfterGC") \
3168 \
3169 develop(uintx, ExitAfterGCNum, 0, \
3170 "If non-zero, exit after this GC.") \
3171 \
3172 product(intx, MaxTenuringThreshold, 15, \
3173 "Maximum value for tenuring threshold") \
3174 \
3175 product(intx, InitialTenuringThreshold, 7, \
3176 "Initial value for tenuring threshold") \
3177 \
3178 product(intx, TargetSurvivorRatio, 50, \
3179 "Desired percentage of survivor space used after scavenge") \
3180 \
3181 product(uintx, MarkSweepDeadRatio, 5, \
3182 "Percentage (0-100) of the old gen allowed as dead wood." \
3183 "Serial mark sweep treats this as both the min and max value." \
3184 "CMS uses this value only if it falls back to mark sweep." \
3185 "Par compact uses a variable scale based on the density of the" \
3186 "generation and treats this as the max value when the heap is" \
3187 "either completely full or completely empty. Par compact also" \
3188 "has a smaller default value; see arguments.cpp.") \
3189 \
3190 product(uintx, PermMarkSweepDeadRatio, 20, \
3191 "Percentage (0-100) of the perm gen allowed as dead wood." \
3192 "See MarkSweepDeadRatio for collector-specific comments.") \
3193 \
3194 product(intx, MarkSweepAlwaysCompactCount, 4, \
3195 "How often should we fully compact the heap (ignoring the dead " \
3196 "space parameters)") \
3197 \
3198 product(intx, PrintCMSStatistics, 0, \
3199 "Statistics for CMS") \
3200 \
3201 product(bool, PrintCMSInitiationStatistics, false, \
3202 "Statistics for initiating a CMS collection") \
3203 \
3204 product(intx, PrintFLSStatistics, 0, \
3205 "Statistics for CMS' FreeListSpace") \
3206 \
3207 product(intx, PrintFLSCensus, 0, \
3208 "Census for CMS' FreeListSpace") \
3209 \
3210 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3211 "Delay in ms between expansion and allocation") \
3212 \
3213 product(intx, DeferThrSuspendLoopCount, 4000, \
3214 "(Unstable) Number of times to iterate in safepoint loop " \
3215 " before blocking VM threads ") \
3216 \
3217 product(intx, DeferPollingPageLoopCount, -1, \
3218 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3219 "before changing safepoint polling page to RO ") \
3220 \
3221 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3222 \
3223 product(bool, PSChunkLargeArrays, true, \
3224 "true: process large arrays in chunks") \
3225 \
3226 product(uintx, GCDrainStackTargetSize, 64, \
3227 "how many entries we'll try to leave on the stack during " \
3228 "parallel GC") \
3229 \
3230 /* stack parameters */ \
3231 product_pd(intx, StackYellowPages, \
3232 "Number of yellow zone (recoverable overflows) pages") \
3233 \
3234 product_pd(intx, StackRedPages, \
3235 "Number of red zone (unrecoverable overflows) pages") \
3236 \
3237 product_pd(intx, StackShadowPages, \
3238 "Number of shadow zone (for overflow checking) pages" \
3239 " this should exceed the depth of the VM and native call stack") \
3240 \
3241 product_pd(intx, ThreadStackSize, \
3242 "Thread Stack Size (in Kbytes)") \
3243 \
3244 product_pd(intx, VMThreadStackSize, \
3245 "Non-Java Thread Stack Size (in Kbytes)") \
3246 \
3247 product_pd(intx, CompilerThreadStackSize, \
3248 "Compiler Thread Stack Size (in Kbytes)") \
3249 \
3250 develop_pd(uintx, JVMInvokeMethodSlack, \
3251 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3252 \
3253 product(uintx, ThreadSafetyMargin, 50*M, \
3254 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3255 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3256 "disable this feature") \
3257 \
3258 /* code cache parameters */ \
3259 develop(uintx, CodeCacheSegmentSize, 64, \
3260 "Code cache segment size (in bytes) - smallest unit of " \
3261 "allocation") \
3262 \
3263 develop_pd(intx, CodeEntryAlignment, \
3264 "Code entry alignment for generated code (in bytes)") \
3265 \
3266 product_pd(intx, OptoLoopAlignment, \
3267 "Align inner loops to zero relative to this modulus") \
3268 \
3269 product_pd(uintx, InitialCodeCacheSize, \
3270 "Initial code cache size (in bytes)") \
3271 \
3272 product_pd(uintx, ReservedCodeCacheSize, \
3273 "Reserved code cache size (in bytes) - maximum code cache size") \
3274 \
3275 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3276 "When less than X space left, we stop compiling.") \
3277 \
3278 product_pd(uintx, CodeCacheExpansionSize, \
3279 "Code cache expansion size (in bytes)") \
3280 \
3281 develop_pd(uintx, CodeCacheMinBlockLength, \
3282 "Minimum number of segments in a code cache block.") \
3283 \
3284 notproduct(bool, ExitOnFullCodeCache, false, \
3285 "Exit the VM if we fill the code cache.") \
3286 \
3287 product(bool, UseCodeCacheFlushing, false, \
3288 "Attempt to clean the code cache before shutting off compiler") \
3289 \
3290 product(intx, MinCodeCacheFlushingInterval, 30, \
3291 "Min number of seconds between code cache cleaning sessions") \
3292 \
3293 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3294 "When less than X space left, start code cache cleaning") \
3295 \
3296 /* interpreter debugging */ \
3297 develop(intx, BinarySwitchThreshold, 5, \
3298 "Minimal number of lookupswitch entries for rewriting to binary " \
3299 "switch") \
3300 \
3301 develop(intx, StopInterpreterAt, 0, \
3302 "Stops interpreter execution at specified bytecode number") \
3303 \
3304 develop(intx, TraceBytecodesAt, 0, \
3305 "Traces bytecodes starting with specified bytecode number") \
3306 \
3307 /* compiler interface */ \
3308 develop(intx, CIStart, 0, \
3309 "the id of the first compilation to permit") \
3310 \
3311 develop(intx, CIStop, -1, \
3312 "the id of the last compilation to permit") \
3313 \
3314 develop(intx, CIStartOSR, 0, \
3315 "the id of the first osr compilation to permit " \
3316 "(CICountOSR must be on)") \
3317 \
3318 develop(intx, CIStopOSR, -1, \
3319 "the id of the last osr compilation to permit " \
3320 "(CICountOSR must be on)") \
3321 \
3322 develop(intx, CIBreakAtOSR, -1, \
3323 "id of osr compilation to break at") \
3324 \
3325 develop(intx, CIBreakAt, -1, \
3326 "id of compilation to break at") \
3327 \
3328 product(ccstrlist, CompileOnly, "", \
3329 "List of methods (pkg/class.name) to restrict compilation to") \
3330 \
3331 product(ccstr, CompileCommandFile, NULL, \
3332 "Read compiler commands from this file [.hotspot_compiler]") \
3333 \
3334 product(ccstrlist, CompileCommand, "", \
3335 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3336 \
3337 product(bool, CICompilerCountPerCPU, false, \
3338 "1 compiler thread for log(N CPUs)") \
3339 \
3340 develop(intx, CIFireOOMAt, -1, \
3341 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3342 "(non-negative value throws OOM after this many CI accesses " \
3343 "in each compile)") \
3344 \
3345 develop(intx, CIFireOOMAtDelay, -1, \
3346 "Wait for this many CI accesses to occur in all compiles before " \
3347 "beginning to throw OutOfMemoryErrors in each compile") \
3348 \
3349 notproduct(bool, CIObjectFactoryVerify, false, \
3350 "enable potentially expensive verification in ciObjectFactory") \
3351 \
3352 /* Priorities */ \
3353 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3354 \
3355 product(intx, ThreadPriorityPolicy, 0, \
3356 "0 : Normal. "\
3357 " VM chooses priorities that are appropriate for normal "\
3358 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3359 " to normal native priority. Java priorities below NORM_PRIORITY"\
3360 " map to lower native priority values. On Windows applications"\
3361 " are allowed to use higher native priorities. However, with "\
3362 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3363 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3364 " interfere with system threads. On Linux thread priorities "\
3365 " are ignored because the OS does not support static priority "\
3366 " in SCHED_OTHER scheduling class which is the only choice for"\
3367 " non-root, non-realtime applications. "\
3368 "1 : Aggressive. "\
3369 " Java thread priorities map over to the entire range of "\
3370 " native thread priorities. Higher Java thread priorities map "\
3371 " to higher native thread priorities. This policy should be "\
3372 " used with care, as sometimes it can cause performance "\
3373 " degradation in the application and/or the entire system. On "\
3374 " Linux this policy requires root privilege.") \
3375 \
3376 product(bool, ThreadPriorityVerbose, false, \
3377 "print priority changes") \
3378 \
3379 product(intx, DefaultThreadPriority, -1, \
3380 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3381 \
3382 product(intx, CompilerThreadPriority, -1, \
3383 "what priority should compiler threads run at (-1 means no change)") \
3384 \
3385 product(intx, VMThreadPriority, -1, \
3386 "what priority should VM threads run at (-1 means no change)") \
3387 \
3388 product(bool, CompilerThreadHintNoPreempt, true, \
3389 "(Solaris only) Give compiler threads an extra quanta") \
3390 \
3391 product(bool, VMThreadHintNoPreempt, false, \
3392 "(Solaris only) Give VM thread an extra quanta") \
3393 \
3394 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3395 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3396 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3397 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3398 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3399 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3400 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3401 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3402 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3403 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3404 \
3405 /* compiler debugging */ \
3406 notproduct(intx, CompileTheWorldStartAt, 1, \
3407 "First class to consider when using +CompileTheWorld") \
3408 \
3409 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3410 "Last class to consider when using +CompileTheWorld") \
3411 \
3412 develop(intx, NewCodeParameter, 0, \
3413 "Testing Only: Create a dedicated integer parameter before " \
3414 "putback") \
3415 \
3416 /* new oopmap storage allocation */ \
3417 develop(intx, MinOopMapAllocation, 8, \
3418 "Minimum number of OopMap entries in an OopMapSet") \
3419 \
3420 /* Background Compilation */ \
3421 develop(intx, LongCompileThreshold, 50, \
3422 "Used with +TraceLongCompiles") \
3423 \
3424 product(intx, StarvationMonitorInterval, 200, \
3425 "Pause between each check in ms") \
3426 \
3427 /* recompilation */ \
3428 product_pd(intx, CompileThreshold, \
3429 "number of interpreted method invocations before (re-)compiling") \
3430 \
3431 product_pd(intx, BackEdgeThreshold, \
3432 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3433 \
3434 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3435 "Interpreter (tier 0) invocation notification frequency.") \
3436 \
3437 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3438 "C1 without MDO (tier 2) invocation notification frequency.") \
3439 \
3440 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3441 "C1 with MDO profiling (tier 3) invocation notification " \
3442 "frequency.") \
3443 \
3444 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3445 "Interpreter (tier 0) invocation notification frequency.") \
3446 \
3447 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3448 "C1 without MDO (tier 2) invocation notification frequency.") \
3449 \
3450 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3451 "C1 with MDO profiling (tier 3) invocation notification " \
3452 "frequency.") \
3453 \
3454 product(intx, Tier2CompileThreshold, 0, \
3455 "threshold at which tier 2 compilation is invoked") \
3456 \
3457 product(intx, Tier2BackEdgeThreshold, 0, \
3458 "Back edge threshold at which tier 2 compilation is invoked") \
3459 \
3460 product(intx, Tier3InvocationThreshold, 200, \
3461 "Compile if number of method invocations crosses this " \
3462 "threshold") \
3463 \
3464 product(intx, Tier3MinInvocationThreshold, 100, \
3465 "Minimum invocation to compile at tier 3") \
3466 \
3467 product(intx, Tier3CompileThreshold, 2000, \
3468 "Threshold at which tier 3 compilation is invoked (invocation " \
3469 "minimum must be satisfied.") \
3470 \
3471 product(intx, Tier3BackEdgeThreshold, 7000, \
3472 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3473 \
3474 product(intx, Tier4InvocationThreshold, 5000, \
3475 "Compile if number of method invocations crosses this " \
3476 "threshold") \
3477 \
3478 product(intx, Tier4MinInvocationThreshold, 600, \
3479 "Minimum invocation to compile at tier 4") \
3480 \
3481 product(intx, Tier4CompileThreshold, 15000, \
3482 "Threshold at which tier 4 compilation is invoked (invocation " \
3483 "minimum must be satisfied.") \
3484 \
3485 product(intx, Tier4BackEdgeThreshold, 40000, \
3486 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3487 \
3488 product(intx, Tier3DelayOn, 5, \
3489 "If C2 queue size grows over this amount per compiler thread " \
3490 "stop compiling at tier 3 and start compiling at tier 2") \
3491 \
3492 product(intx, Tier3DelayOff, 2, \
3493 "If C2 queue size is less than this amount per compiler thread " \
3494 "allow methods compiled at tier 2 transition to tier 3") \
3495 \
3496 product(intx, Tier3LoadFeedback, 5, \
3497 "Tier 3 thresholds will increase twofold when C1 queue size " \
3498 "reaches this amount per compiler thread") \
3499 \
3500 product(intx, Tier4LoadFeedback, 3, \
3501 "Tier 4 thresholds will increase twofold when C2 queue size " \
3502 "reaches this amount per compiler thread") \
3503 \
3504 product(intx, TieredCompileTaskTimeout, 50, \
3505 "Kill compile task if method was not used within " \
3506 "given timeout in milliseconds") \
3507 \
3508 product(intx, TieredStopAtLevel, 4, \
3509 "Stop at given compilation level") \
3510 \
3511 product(intx, Tier0ProfilingStartPercentage, 200, \
3512 "Start profiling in interpreter if the counters exceed tier 3" \
3513 "thresholds by the specified percentage") \
3514 \
3515 product(intx, TieredRateUpdateMinTime, 1, \
3516 "Minimum rate sampling interval (in milliseconds)") \
3517 \
3518 product(intx, TieredRateUpdateMaxTime, 25, \
3519 "Maximum rate sampling interval (in milliseconds)") \
3520 \
3521 product_pd(bool, TieredCompilation, \
3522 "Enable tiered compilation") \
3523 \
3524 product(bool, PrintTieredEvents, false, \
3525 "Print tiered events notifications") \
3526 \
3527 product(bool, StressTieredRuntime, false, \
3528 "Alternate client and server compiler on compile requests") \
3529 \
3530 product_pd(intx, OnStackReplacePercentage, \
3531 "NON_TIERED number of method invocations/branches (expressed as %"\
3532 "of CompileThreshold) before (re-)compiling OSR code") \
3533 \
3534 product(intx, InterpreterProfilePercentage, 33, \
3535 "NON_TIERED number of method invocations/branches (expressed as %"\
3536 "of CompileThreshold) before profiling in the interpreter") \
3537 \
3538 develop(intx, MaxRecompilationSearchLength, 10, \
3539 "max. # frames to inspect searching for recompilee") \
3540 \
3541 develop(intx, MaxInterpretedSearchLength, 3, \
3542 "max. # interp. frames to skip when searching for recompilee") \
3543 \
3544 develop(intx, DesiredMethodLimit, 8000, \
3545 "desired max. method size (in bytecodes) after inlining") \
3546 \
3547 develop(intx, HugeMethodLimit, 8000, \
3548 "don't compile methods larger than this if " \
3549 "+DontCompileHugeMethods") \
3550 \
3551 /* New JDK 1.4 reflection implementation */ \
3552 \
3553 develop(bool, UseNewReflection, true, \
3554 "Temporary flag for transition to reflection based on dynamic " \
3555 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3556 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3557 "changes were needed") \
3558 \
3559 develop(bool, VerifyReflectionBytecodes, false, \
3560 "Force verification of 1.4 reflection bytecodes. Does not work " \
3561 "in situations like that described in 4486457 or for " \
3562 "constructors generated for serialization, so can not be enabled "\
3563 "in product.") \
3564 \
3565 product(bool, ReflectionWrapResolutionErrors, true, \
3566 "Temporary flag for transition to AbstractMethodError wrapped " \
3567 "in InvocationTargetException. See 6531596") \
3568 \
3569 \
3570 develop(intx, FastSuperclassLimit, 8, \
3571 "Depth of hardwired instanceof accelerator array") \
3572 \
3573 /* Properties for Java libraries */ \
3574 \
3575 product(intx, MaxDirectMemorySize, -1, \
3576 "Maximum total size of NIO direct-buffer allocations") \
3577 \
3578 /* temporary developer defined flags */ \
3579 \
3580 diagnostic(bool, UseNewCode, false, \
3581 "Testing Only: Use the new version while testing") \
3582 \
3583 diagnostic(bool, UseNewCode2, false, \
3584 "Testing Only: Use the new version while testing") \
3585 \
3586 diagnostic(bool, UseNewCode3, false, \
3587 "Testing Only: Use the new version while testing") \
3588 \
3589 /* flags for performance data collection */ \
3590 \
3591 NOT_EMBEDDED(product(bool, UsePerfData, true, \
3592 "Flag to disable jvmstat instrumentation for performance testing" \
3593 "and problem isolation purposes.")) \
3594 \
3595 EMBEDDED_ONLY(product(bool, UsePerfData, false, \
3596 "Flag to disable jvmstat instrumentation for performance testing" \
3597 "and problem isolation purposes.")) \
3598 \
3599 product(bool, PerfDataSaveToFile, false, \
3600 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3601 \
3602 product(ccstr, PerfDataSaveFile, NULL, \
3603 "Save PerfData memory to the specified absolute pathname," \
3604 "%p in the file name if present will be replaced by pid") \
3605 \
3606 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3607 "Data sampling interval in milliseconds") \
3608 \
3609 develop(bool, PerfTraceDataCreation, false, \
3610 "Trace creation of Performance Data Entries") \
3611 \
3612 develop(bool, PerfTraceMemOps, false, \
3613 "Trace PerfMemory create/attach/detach calls") \
3614 \
3615 product(bool, PerfDisableSharedMem, false, \
3616 "Store performance data in standard memory") \
3617 \
3618 product(intx, PerfDataMemorySize, 32*K, \
3619 "Size of performance data memory region. Will be rounded " \
3620 "up to a multiple of the native os page size.") \
3621 \
3622 product(intx, PerfMaxStringConstLength, 1024, \
3623 "Maximum PerfStringConstant string length before truncation") \
3624 \
3625 product(bool, PerfAllowAtExitRegistration, false, \
3626 "Allow registration of atexit() methods") \
3627 \
3628 product(bool, PerfBypassFileSystemCheck, false, \
3629 "Bypass Win32 file system criteria checks (Windows Only)") \
3630 \
3631 product(intx, UnguardOnExecutionViolation, 0, \
3632 "Unguard page and retry on no-execute fault (Win32 only)" \
3633 "0=off, 1=conservative, 2=aggressive") \
3634 \
3635 /* Serviceability Support */ \
3636 \
3637 product(bool, ManagementServer, false, \
3638 "Create JMX Management Server") \
3639 \
3640 product(bool, DisableAttachMechanism, false, \
3641 "Disable mechanism that allows tools to attach to this VM") \
3642 \
3643 product(bool, StartAttachListener, false, \
3644 "Always start Attach Listener at VM startup") \
3645 \
3646 manageable(bool, PrintConcurrentLocks, false, \
3647 "Print java.util.concurrent locks in thread dump") \
3648 \
3649 product(bool, TransmitErrorReport, false, \
3650 "Enable error report transmission on erroneous termination") \
3651 \
3652 product(ccstr, ErrorReportServer, NULL, \
3653 "Override built-in error report server address") \
3654 \
3655 /* Shared spaces */ \
3656 \
3657 product(bool, UseSharedSpaces, true, \
3658 "Use shared spaces in the permanent generation") \
3659 \
3660 product(bool, RequireSharedSpaces, false, \
3661 "Require shared spaces in the permanent generation") \
3662 \
3663 product(bool, DumpSharedSpaces, false, \
3664 "Special mode: JVM reads a class list, loads classes, builds " \
3665 "shared spaces, and dumps the shared spaces to a file to be " \
3666 "used in future JVM runs.") \
3667 \
3668 product(bool, PrintSharedSpaces, false, \
3669 "Print usage of shared spaces") \
3670 \
3671 product(uintx, SharedDummyBlockSize, 512*M, \
3672 "Size of dummy block used to shift heap addresses (in bytes)") \
3673 \
3674 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \
3675 "Size of read-write space in permanent generation (in bytes)") \
3676 \
3677 product(uintx, SharedReadOnlySize, 10*M, \
3678 "Size of read-only space in permanent generation (in bytes)") \
3679 \
3680 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \
3681 "Size of the shared data area adjacent to the heap (in bytes)") \
3682 \
3683 product(uintx, SharedMiscCodeSize, 4*M, \
3684 "Size of the shared code area adjacent to the heap (in bytes)") \
3685 \
3686 diagnostic(bool, SharedOptimizeColdStart, true, \
3687 "At dump time, order shared objects to achieve better " \
3688 "cold startup time.") \
3689 \
3690 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3691 "Reordering policy for SharedOptimizeColdStart " \
3692 "0=favor classload-time locality, 1=balanced, " \
3693 "2=favor runtime locality") \
3694 \
3695 diagnostic(bool, SharedSkipVerify, false, \
3696 "Skip assert() and verify() which page-in unwanted shared " \
3697 "objects. ") \
3698 \
3699 diagnostic(bool, EnableInvokeDynamic, true, \
3700 "support JSR 292 (method handles, invokedynamic, " \
3701 "anonymous classes") \
3702 \
3703 product(bool, AnonymousClasses, false, \
3704 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \
3705 \
3706 experimental(bool, EnableMethodHandles, false, \
3707 "support method handles (deprecated)") \
3708 \
3709 diagnostic(intx, MethodHandlePushLimit, 3, \
3710 "number of additional stack slots a method handle may push") \
3711 \
3712 develop(bool, TraceMethodHandles, false, \
3713 "trace internal method handle operations") \
3714 \
3715 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3716 "perform extra checks when constructing method handles") \
3717 \
3718 diagnostic(bool, OptimizeMethodHandles, true, \
3719 "when constructing method handles, try to improve them") \
3720 \
3721 experimental(bool, TrustFinalNonStaticFields, false, \
3722 "trust final non-static declarations for constant folding") \
3723 \
3724 experimental(bool, AllowInvokeGeneric, true, \
3725 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \
3726 "as equivalent methods") \
3727 \
3728 develop(bool, TraceInvokeDynamic, false, \
3729 "trace internal invoke dynamic operations") \
3730 \
3731 diagnostic(bool, PauseAtStartup, false, \
3732 "Causes the VM to pause at startup time and wait for the pause " \
3733 "file to be removed (default: ./vm.paused.<pid>)") \
3734 \
3735 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3736 "The file to create and for whose removal to await when pausing " \
3737 "at startup. (default: ./vm.paused.<pid>)") \
3738 \
3739 diagnostic(bool, PauseAtExit, false, \
3740 "Pause and wait for keypress on exit if a debugger is attached") \
3741 \
3742 product(bool, ExtendedDTraceProbes, false, \
3743 "Enable performance-impacting dtrace probes") \
3744 \
3745 product(bool, DTraceMethodProbes, false, \
3746 "Enable dtrace probes for method-entry and method-exit") \
3747 \
3748 product(bool, DTraceAllocProbes, false, \
3749 "Enable dtrace probes for object allocation") \
3750 \
3751 product(bool, DTraceMonitorProbes, false, \
3752 "Enable dtrace probes for monitor events") \
3753 \
3754 product(bool, RelaxAccessControlCheck, false, \
3755 "Relax the access control checks in the verifier") \
3756 \
3757 diagnostic(bool, PrintDTraceDOF, false, \
3758 "Print the DTrace DOF passed to the system for JSDT probes") \
3759 \
3760 product(uintx, StringTableSize, 1009, \
3761 "Number of buckets in the interned String table") \
3762 \
3763 product(bool, UseVMInterruptibleIO, false, \
3764 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3765 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3766 " of this flag is true for JDK 6 and earliers")
3768 /*
3769 * Macros for factoring of globals
3770 */
3772 // Interface macros
3773 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3774 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3775 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3776 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3777 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3778 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3779 #ifdef PRODUCT
3780 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3781 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3782 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3783 #else
3784 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3785 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3786 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3787 #endif
3788 // Special LP64 flags, product only needed for now.
3789 #ifdef _LP64
3790 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3791 #else
3792 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3793 #endif // _LP64
3795 // Implementation macros
3796 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3797 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3798 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3799 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3800 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3801 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3802 #ifdef PRODUCT
3803 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3804 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3805 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3806 #else
3807 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3808 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3809 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3810 #endif
3811 #ifdef _LP64
3812 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3813 #else
3814 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3815 #endif // _LP64
3817 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)
3819 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3821 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP