Mon, 16 Jun 2014 10:23:46 -0400
8038903: More native monitor monitoring
Summary: Moved ntive monitor monitoring flags to experimental
Reviewed-by: acorn, hseigel, mschoene
1 /*
2 * Copyright (c) 1997, 2014, 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"
30 // use this for flags that are true per default in the tiered build
31 // but false in non-tiered builds, and vice versa
32 #ifdef TIERED
33 #define trueInTiered true
34 #define falseInTiered false
35 #else
36 #define trueInTiered false
37 #define falseInTiered true
38 #endif
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_linux
56 # include "globals_linux.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_solaris
59 # include "globals_solaris.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_windows
62 # include "globals_windows.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_aix
65 # include "globals_aix.hpp"
66 #endif
67 #ifdef TARGET_OS_FAMILY_bsd
68 # include "globals_bsd.hpp"
69 #endif
70 #ifdef TARGET_OS_ARCH_linux_x86
71 # include "globals_linux_x86.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_sparc
74 # include "globals_linux_sparc.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_linux_zero
77 # include "globals_linux_zero.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_solaris_x86
80 # include "globals_solaris_x86.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_solaris_sparc
83 # include "globals_solaris_sparc.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_windows_x86
86 # include "globals_windows_x86.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_linux_arm
89 # include "globals_linux_arm.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_linux_ppc
92 # include "globals_linux_ppc.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_aix_ppc
95 # include "globals_aix_ppc.hpp"
96 #endif
97 #ifdef TARGET_OS_ARCH_bsd_x86
98 # include "globals_bsd_x86.hpp"
99 #endif
100 #ifdef TARGET_OS_ARCH_bsd_zero
101 # include "globals_bsd_zero.hpp"
102 #endif
103 #ifdef COMPILER1
104 #ifdef TARGET_ARCH_x86
105 # include "c1_globals_x86.hpp"
106 #endif
107 #ifdef TARGET_ARCH_sparc
108 # include "c1_globals_sparc.hpp"
109 #endif
110 #ifdef TARGET_ARCH_arm
111 # include "c1_globals_arm.hpp"
112 #endif
113 #ifdef TARGET_ARCH_ppc
114 # include "c1_globals_ppc.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_linux
117 # include "c1_globals_linux.hpp"
118 #endif
119 #ifdef TARGET_OS_FAMILY_solaris
120 # include "c1_globals_solaris.hpp"
121 #endif
122 #ifdef TARGET_OS_FAMILY_windows
123 # include "c1_globals_windows.hpp"
124 #endif
125 #ifdef TARGET_OS_FAMILY_aix
126 # include "c1_globals_aix.hpp"
127 #endif
128 #ifdef TARGET_OS_FAMILY_bsd
129 # include "c1_globals_bsd.hpp"
130 #endif
131 #endif
132 #ifdef COMPILER2
133 #ifdef TARGET_ARCH_x86
134 # include "c2_globals_x86.hpp"
135 #endif
136 #ifdef TARGET_ARCH_sparc
137 # include "c2_globals_sparc.hpp"
138 #endif
139 #ifdef TARGET_ARCH_arm
140 # include "c2_globals_arm.hpp"
141 #endif
142 #ifdef TARGET_ARCH_ppc
143 # include "c2_globals_ppc.hpp"
144 #endif
145 #ifdef TARGET_OS_FAMILY_linux
146 # include "c2_globals_linux.hpp"
147 #endif
148 #ifdef TARGET_OS_FAMILY_solaris
149 # include "c2_globals_solaris.hpp"
150 #endif
151 #ifdef TARGET_OS_FAMILY_windows
152 # include "c2_globals_windows.hpp"
153 #endif
154 #ifdef TARGET_OS_FAMILY_aix
155 # include "c2_globals_aix.hpp"
156 #endif
157 #ifdef TARGET_OS_FAMILY_bsd
158 # include "c2_globals_bsd.hpp"
159 #endif
160 #endif
161 #ifdef SHARK
162 #ifdef TARGET_ARCH_zero
163 # include "shark_globals_zero.hpp"
164 #endif
165 #endif
167 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
168 define_pd_global(bool, BackgroundCompilation, false);
169 define_pd_global(bool, UseTLAB, false);
170 define_pd_global(bool, CICompileOSR, false);
171 define_pd_global(bool, UseTypeProfile, false);
172 define_pd_global(bool, UseOnStackReplacement, false);
173 define_pd_global(bool, InlineIntrinsics, false);
174 define_pd_global(bool, PreferInterpreterNativeStubs, true);
175 define_pd_global(bool, ProfileInterpreter, false);
176 define_pd_global(bool, ProfileTraps, false);
177 define_pd_global(bool, TieredCompilation, false);
179 define_pd_global(intx, CompileThreshold, 0);
180 define_pd_global(intx, BackEdgeThreshold, 0);
182 define_pd_global(intx, OnStackReplacePercentage, 0);
183 define_pd_global(bool, ResizeTLAB, false);
184 define_pd_global(intx, FreqInlineSize, 0);
185 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
186 define_pd_global(intx, InlineClassNatives, true);
187 define_pd_global(intx, InlineUnsafeOps, true);
188 define_pd_global(intx, InitialCodeCacheSize, 160*K);
189 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
190 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
191 define_pd_global(intx, CodeCacheMinBlockLength, 1);
192 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
193 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M));
194 define_pd_global(bool, NeverActAsServerClassMachine, true);
195 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
196 #define CI_COMPILER_COUNT 0
197 #else
199 #ifdef COMPILER2
200 #define CI_COMPILER_COUNT 2
201 #else
202 #define CI_COMPILER_COUNT 1
203 #endif // COMPILER2
205 #endif // no compilers
207 // string type aliases used only in this file
208 typedef const char* ccstr;
209 typedef const char* ccstrlist; // represents string arguments which accumulate
211 struct Flag {
212 enum Flags {
213 // value origin
214 DEFAULT = 0,
215 COMMAND_LINE = 1,
216 ENVIRON_VAR = 2,
217 CONFIG_FILE = 3,
218 MANAGEMENT = 4,
219 ERGONOMIC = 5,
220 ATTACH_ON_DEMAND = 6,
221 INTERNAL = 7,
223 LAST_VALUE_ORIGIN = INTERNAL,
224 VALUE_ORIGIN_BITS = 4,
225 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
227 // flag kind
228 KIND_PRODUCT = 1 << 4,
229 KIND_MANAGEABLE = 1 << 5,
230 KIND_DIAGNOSTIC = 1 << 6,
231 KIND_EXPERIMENTAL = 1 << 7,
232 KIND_NOT_PRODUCT = 1 << 8,
233 KIND_DEVELOP = 1 << 9,
234 KIND_PLATFORM_DEPENDENT = 1 << 10,
235 KIND_READ_WRITE = 1 << 11,
236 KIND_C1 = 1 << 12,
237 KIND_C2 = 1 << 13,
238 KIND_ARCH = 1 << 14,
239 KIND_SHARK = 1 << 15,
240 KIND_LP64_PRODUCT = 1 << 16,
241 KIND_COMMERCIAL = 1 << 17,
243 KIND_MASK = ~VALUE_ORIGIN_MASK
244 };
246 const char* _type;
247 const char* _name;
248 void* _addr;
249 NOT_PRODUCT(const char* _doc;)
250 Flags _flags;
252 // points to all Flags static array
253 static Flag* flags;
255 // number of flags
256 static size_t numFlags;
258 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
259 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
261 void check_writable();
263 bool is_bool() const;
264 bool get_bool() const;
265 void set_bool(bool value);
267 bool is_intx() const;
268 intx get_intx() const;
269 void set_intx(intx value);
271 bool is_uintx() const;
272 uintx get_uintx() const;
273 void set_uintx(uintx value);
275 bool is_uint64_t() const;
276 uint64_t get_uint64_t() const;
277 void set_uint64_t(uint64_t value);
279 bool is_double() const;
280 double get_double() const;
281 void set_double(double value);
283 bool is_ccstr() const;
284 bool ccstr_accumulates() const;
285 ccstr get_ccstr() const;
286 void set_ccstr(ccstr value);
288 Flags get_origin();
289 void set_origin(Flags origin);
291 bool is_default();
292 bool is_ergonomic();
293 bool is_command_line();
295 bool is_product() const;
296 bool is_manageable() const;
297 bool is_diagnostic() const;
298 bool is_experimental() const;
299 bool is_notproduct() const;
300 bool is_develop() const;
301 bool is_read_write() const;
302 bool is_commercial() const;
304 bool is_constant_in_binary() const;
306 bool is_unlocker() const;
307 bool is_unlocked() const;
308 bool is_writeable() const;
309 bool is_external() const;
311 bool is_unlocker_ext() const;
312 bool is_unlocked_ext() const;
313 bool is_writeable_ext() const;
314 bool is_external_ext() const;
316 void get_locked_message(char*, int) const;
317 void get_locked_message_ext(char*, int) const;
319 void print_on(outputStream* st, bool withComments = false );
320 void print_kind(outputStream* st);
321 void print_as_flag(outputStream* st);
322 };
324 // debug flags control various aspects of the VM and are global accessible
326 // use FlagSetting to temporarily change some debug flag
327 // e.g. FlagSetting fs(DebugThisAndThat, true);
328 // restored to previous value upon leaving scope
329 class FlagSetting {
330 bool val;
331 bool* flag;
332 public:
333 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
334 ~FlagSetting() { *flag = val; }
335 };
338 class CounterSetting {
339 intx* counter;
340 public:
341 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
342 ~CounterSetting() { (*counter)--; }
343 };
346 class UIntFlagSetting {
347 uintx val;
348 uintx* flag;
349 public:
350 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
351 ~UIntFlagSetting() { *flag = val; }
352 };
355 class DoubleFlagSetting {
356 double val;
357 double* flag;
358 public:
359 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
360 ~DoubleFlagSetting() { *flag = val; }
361 };
364 class CommandLineFlags {
365 public:
366 static bool boolAt(char* name, size_t len, bool* value);
367 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
368 static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
369 static bool boolAtPut(char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
371 static bool intxAt(char* name, size_t len, intx* value);
372 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
373 static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
374 static bool intxAtPut(char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
376 static bool uintxAt(char* name, size_t len, uintx* value);
377 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
378 static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
379 static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
381 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
382 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
383 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
384 static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
386 static bool doubleAt(char* name, size_t len, double* value);
387 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
388 static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
389 static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
391 static bool ccstrAt(char* name, size_t len, ccstr* value);
392 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
393 static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
394 static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
396 // Returns false if name is not a command line flag.
397 static bool wasSetOnCmdline(const char* name, bool* value);
398 static void printSetFlags(outputStream* out);
400 static void printFlags(outputStream* out, bool withComments);
402 static void verify() PRODUCT_RETURN;
403 };
405 // use this for flags that are true by default in the debug version but
406 // false in the optimized version, and vice versa
407 #ifdef ASSERT
408 #define trueInDebug true
409 #define falseInDebug false
410 #else
411 #define trueInDebug false
412 #define falseInDebug true
413 #endif
415 // use this for flags that are true per default in the product build
416 // but false in development builds, and vice versa
417 #ifdef PRODUCT
418 #define trueInProduct true
419 #define falseInProduct false
420 #else
421 #define trueInProduct false
422 #define falseInProduct true
423 #endif
425 #ifdef JAVASE_EMBEDDED
426 #define falseInEmbedded false
427 #else
428 #define falseInEmbedded true
429 #endif
431 // develop flags are settable / visible only during development and are constant in the PRODUCT version
432 // product flags are always settable / visible
433 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
435 // A flag must be declared with one of the following types:
436 // bool, intx, uintx, ccstr.
437 // The type "ccstr" is an alias for "const char*" and is used
438 // only in this file, because the macrology requires single-token type names.
440 // Note: Diagnostic options not meant for VM tuning or for product modes.
441 // They are to be used for VM quality assurance or field diagnosis
442 // of VM bugs. They are hidden so that users will not be encouraged to
443 // try them as if they were VM ordinary execution options. However, they
444 // are available in the product version of the VM. Under instruction
445 // from support engineers, VM customers can turn them on to collect
446 // diagnostic information about VM problems. To use a VM diagnostic
447 // option, you must first specify +UnlockDiagnosticVMOptions.
448 // (This master switch also affects the behavior of -Xprintflags.)
449 //
450 // experimental flags are in support of features that are not
451 // part of the officially supported product, but are available
452 // for experimenting with. They could, for example, be performance
453 // features that may not have undergone full or rigorous QA, but which may
454 // help performance in some cases and released for experimentation
455 // by the community of users and developers. This flag also allows one to
456 // be able to build a fully supported product that nonetheless also
457 // ships with some unsupported, lightly tested, experimental features.
458 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
459 // UnlockExperimentalVMOptions flag, which allows the control and
460 // modification of the experimental flags.
461 //
462 // Nota bene: neither diagnostic nor experimental options should be used casually,
463 // and they are not supported on production loads, except under explicit
464 // direction from support engineers.
465 //
466 // manageable flags are writeable external product flags.
467 // They are dynamically writeable through the JDK management interface
468 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
469 // These flags are external exported interface (see CCC). The list of
470 // manageable flags can be queried programmatically through the management
471 // interface.
472 //
473 // A flag can be made as "manageable" only if
474 // - the flag is defined in a CCC as an external exported interface.
475 // - the VM implementation supports dynamic setting of the flag.
476 // This implies that the VM must *always* query the flag variable
477 // and not reuse state related to the flag state at any given time.
478 // - you want the flag to be queried programmatically by the customers.
479 //
480 // product_rw flags are writeable internal product flags.
481 // They are like "manageable" flags but for internal/private use.
482 // The list of product_rw flags are internal/private flags which
483 // may be changed/removed in a future release. It can be set
484 // through the management interface to get/set value
485 // when the name of flag is supplied.
486 //
487 // A flag can be made as "product_rw" only if
488 // - the VM implementation supports dynamic setting of the flag.
489 // This implies that the VM must *always* query the flag variable
490 // and not reuse state related to the flag state at any given time.
491 //
492 // Note that when there is a need to support develop flags to be writeable,
493 // it can be done in the same way as product_rw.
495 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
496 \
497 lp64_product(bool, UseCompressedOops, false, \
498 "Use 32-bit object references in 64-bit VM. " \
499 "lp64_product means flag is always constant in 32 bit VM") \
500 \
501 lp64_product(bool, UseCompressedClassPointers, false, \
502 "Use 32-bit class pointers in 64-bit VM. " \
503 "lp64_product means flag is always constant in 32 bit VM") \
504 \
505 notproduct(bool, CheckCompressedOops, true, \
506 "Generate checks in encoding/decoding code in debug VM") \
507 \
508 product_pd(uintx, HeapBaseMinAddress, \
509 "OS specific low limit for heap base address") \
510 \
511 diagnostic(bool, PrintCompressedOopsMode, false, \
512 "Print compressed oops base address and encoding mode") \
513 \
514 lp64_product(intx, ObjectAlignmentInBytes, 8, \
515 "Default object alignment in bytes, 8 is minimum") \
516 \
517 product(bool, AssumeMP, false, \
518 "Instruct the VM to assume multiple processors are available") \
519 \
520 /* UseMembar is theoretically a temp flag used for memory barrier \
521 * removal testing. It was supposed to be removed before FCS but has \
522 * been re-added (see 6401008) */ \
523 product_pd(bool, UseMembar, \
524 "(Unstable) Issues membars on thread state transitions") \
525 \
526 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
527 "Clean the chunk pool asynchronously") \
528 \
529 /* Temporary: See 6948537 */ \
530 experimental(bool, UseMemSetInBOT, true, \
531 "(Unstable) uses memset in BOT updates in GC code") \
532 \
533 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
534 "Enable normal processing of flags relating to field diagnostics")\
535 \
536 experimental(bool, UnlockExperimentalVMOptions, false, \
537 "Enable normal processing of flags relating to experimental " \
538 "features") \
539 \
540 product(bool, JavaMonitorsInStackTrace, true, \
541 "Print information about Java monitor locks when the stacks are" \
542 "dumped") \
543 \
544 product_pd(bool, UseLargePages, \
545 "Use large page memory") \
546 \
547 product_pd(bool, UseLargePagesIndividualAllocation, \
548 "Allocate large pages individually for better affinity") \
549 \
550 develop(bool, LargePagesIndividualAllocationInjectError, false, \
551 "Fail large pages individual allocation") \
552 \
553 product(bool, UseLargePagesInMetaspace, false, \
554 "Use large page memory in metaspace. " \
555 "Only used if UseLargePages is enabled.") \
556 \
557 develop(bool, TracePageSizes, false, \
558 "Trace page size selection and usage") \
559 \
560 product(bool, UseNUMA, false, \
561 "Use NUMA if available") \
562 \
563 product(bool, UseNUMAInterleaving, false, \
564 "Interleave memory across NUMA nodes if available") \
565 \
566 product(uintx, NUMAInterleaveGranularity, 2*M, \
567 "Granularity to use for NUMA interleaving on Windows OS") \
568 \
569 product(bool, ForceNUMA, false, \
570 "Force NUMA optimizations on single-node/UMA systems") \
571 \
572 product(uintx, NUMAChunkResizeWeight, 20, \
573 "Percentage (0-100) used to weigh the current sample when " \
574 "computing exponentially decaying average for " \
575 "AdaptiveNUMAChunkSizing") \
576 \
577 product(uintx, NUMASpaceResizeRate, 1*G, \
578 "Do not reallocate more than this amount per collection") \
579 \
580 product(bool, UseAdaptiveNUMAChunkSizing, true, \
581 "Enable adaptive chunk sizing for NUMA") \
582 \
583 product(bool, NUMAStats, false, \
584 "Print NUMA stats in detailed heap information") \
585 \
586 product(uintx, NUMAPageScanRate, 256, \
587 "Maximum number of pages to include in the page scan procedure") \
588 \
589 product_pd(bool, NeedsDeoptSuspend, \
590 "True for register window machines (sparc/ia64)") \
591 \
592 product(intx, UseSSE, 99, \
593 "Highest supported SSE instructions set on x86/x64") \
594 \
595 product(bool, UseAES, false, \
596 "Control whether AES instructions can be used on x86/x64") \
597 \
598 product(uintx, LargePageSizeInBytes, 0, \
599 "Large page size (0 to let VM choose the page size)") \
600 \
601 product(uintx, LargePageHeapSizeThreshold, 128*M, \
602 "Use large pages if maximum heap is at least this big") \
603 \
604 product(bool, ForceTimeHighResolution, false, \
605 "Using high time resolution (for Win32 only)") \
606 \
607 develop(bool, TraceItables, false, \
608 "Trace initialization and use of itables") \
609 \
610 develop(bool, TracePcPatching, false, \
611 "Trace usage of frame::patch_pc") \
612 \
613 develop(bool, TraceJumps, false, \
614 "Trace assembly jumps in thread ring buffer") \
615 \
616 develop(bool, TraceRelocator, false, \
617 "Trace the bytecode relocator") \
618 \
619 develop(bool, TraceLongCompiles, false, \
620 "Print out every time compilation is longer than " \
621 "a given threshold") \
622 \
623 develop(bool, SafepointALot, false, \
624 "Generate a lot of safepoints. This works with " \
625 "GuaranteedSafepointInterval") \
626 \
627 product_pd(bool, BackgroundCompilation, \
628 "A thread requesting compilation is not blocked during " \
629 "compilation") \
630 \
631 product(bool, PrintVMQWaitTime, false, \
632 "Print out the waiting time in VM operation queue") \
633 \
634 develop(bool, NoYieldsInMicrolock, false, \
635 "Disable yields in microlock") \
636 \
637 develop(bool, TraceOopMapGeneration, false, \
638 "Show OopMapGeneration") \
639 \
640 product(bool, MethodFlushing, true, \
641 "Reclamation of zombie and not-entrant methods") \
642 \
643 develop(bool, VerifyStack, false, \
644 "Verify stack of each thread when it is entering a runtime call") \
645 \
646 diagnostic(bool, ForceUnreachable, false, \
647 "Make all non code cache addresses to be unreachable by " \
648 "forcing use of 64bit literal fixups") \
649 \
650 notproduct(bool, StressDerivedPointers, false, \
651 "Force scavenge when a derived pointer is detected on stack " \
652 "after rtm call") \
653 \
654 develop(bool, TraceDerivedPointers, false, \
655 "Trace traversal of derived pointers on stack") \
656 \
657 notproduct(bool, TraceCodeBlobStacks, false, \
658 "Trace stack-walk of codeblobs") \
659 \
660 product(bool, PrintJNIResolving, false, \
661 "Used to implement -v:jni") \
662 \
663 notproduct(bool, PrintRewrites, false, \
664 "Print methods that are being rewritten") \
665 \
666 product(bool, UseInlineCaches, true, \
667 "Use Inline Caches for virtual calls ") \
668 \
669 develop(bool, InlineArrayCopy, true, \
670 "Inline arraycopy native that is known to be part of " \
671 "base library DLL") \
672 \
673 develop(bool, InlineObjectHash, true, \
674 "Inline Object::hashCode() native that is known to be part " \
675 "of base library DLL") \
676 \
677 develop(bool, InlineNatives, true, \
678 "Inline natives that are known to be part of base library DLL") \
679 \
680 develop(bool, InlineMathNatives, true, \
681 "Inline SinD, CosD, etc.") \
682 \
683 develop(bool, InlineClassNatives, true, \
684 "Inline Class.isInstance, etc") \
685 \
686 develop(bool, InlineThreadNatives, true, \
687 "Inline Thread.currentThread, etc") \
688 \
689 develop(bool, InlineUnsafeOps, true, \
690 "Inline memory ops (native methods) from sun.misc.Unsafe") \
691 \
692 product(bool, CriticalJNINatives, true, \
693 "Check for critical JNI entry points") \
694 \
695 notproduct(bool, StressCriticalJNINatives, false, \
696 "Exercise register saving code in critical natives") \
697 \
698 product(bool, UseSSE42Intrinsics, false, \
699 "SSE4.2 versions of intrinsics") \
700 \
701 product(bool, UseAESIntrinsics, false, \
702 "Use intrinsics for AES versions of crypto") \
703 \
704 product(bool, UseCRC32Intrinsics, false, \
705 "use intrinsics for java.util.zip.CRC32") \
706 \
707 develop(bool, TraceCallFixup, false, \
708 "Trace all call fixups") \
709 \
710 develop(bool, DeoptimizeALot, false, \
711 "Deoptimize at every exit from the runtime system") \
712 \
713 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
714 "A comma separated list of bcis to deoptimize at") \
715 \
716 product(bool, DeoptimizeRandom, false, \
717 "Deoptimize random frames on random exit from the runtime system")\
718 \
719 notproduct(bool, ZombieALot, false, \
720 "Create zombies (non-entrant) at exit from the runtime system") \
721 \
722 product(bool, UnlinkSymbolsALot, false, \
723 "Unlink unreferenced symbols from the symbol table at safepoints")\
724 \
725 notproduct(bool, WalkStackALot, false, \
726 "Trace stack (no print) at every exit from the runtime system") \
727 \
728 product(bool, Debugging, false, \
729 "Set when executing debug methods in debug.cpp " \
730 "(to prevent triggering assertions)") \
731 \
732 notproduct(bool, StrictSafepointChecks, trueInDebug, \
733 "Enable strict checks that safepoints cannot happen for threads " \
734 "that use No_Safepoint_Verifier") \
735 \
736 notproduct(bool, VerifyLastFrame, false, \
737 "Verify oops on last frame on entry to VM") \
738 \
739 develop(bool, TraceHandleAllocation, false, \
740 "Print out warnings when suspiciously many handles are allocated")\
741 \
742 product(bool, UseCompilerSafepoints, true, \
743 "Stop at safepoints in compiled code") \
744 \
745 product(bool, FailOverToOldVerifier, true, \
746 "Fail over to old verifier when split verifier fails") \
747 \
748 develop(bool, ShowSafepointMsgs, false, \
749 "Show message about safepoint synchronization") \
750 \
751 product(bool, SafepointTimeout, false, \
752 "Time out and warn or fail after SafepointTimeoutDelay " \
753 "milliseconds if failed to reach safepoint") \
754 \
755 develop(bool, DieOnSafepointTimeout, false, \
756 "Die upon failure to reach safepoint (see SafepointTimeout)") \
757 \
758 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
759 /* typically, at most a few retries are needed */ \
760 product(intx, SuspendRetryCount, 50, \
761 "Maximum retry count for an external suspend request") \
762 \
763 product(intx, SuspendRetryDelay, 5, \
764 "Milliseconds to delay per retry (* current_retry_count)") \
765 \
766 product(bool, AssertOnSuspendWaitFailure, false, \
767 "Assert/Guarantee on external suspend wait failure") \
768 \
769 product(bool, TraceSuspendWaitFailures, false, \
770 "Trace external suspend wait failures") \
771 \
772 product(bool, MaxFDLimit, true, \
773 "Bump the number of file descriptors to maximum in Solaris") \
774 \
775 diagnostic(bool, LogEvents, true, \
776 "Enable the various ring buffer event logs") \
777 \
778 diagnostic(uintx, LogEventsBufferEntries, 10, \
779 "Number of ring buffer event logs") \
780 \
781 product(bool, BytecodeVerificationRemote, true, \
782 "Enable the Java bytecode verifier for remote classes") \
783 \
784 product(bool, BytecodeVerificationLocal, false, \
785 "Enable the Java bytecode verifier for local classes") \
786 \
787 develop(bool, ForceFloatExceptions, trueInDebug, \
788 "Force exceptions on FP stack under/overflow") \
789 \
790 develop(bool, VerifyStackAtCalls, false, \
791 "Verify that the stack pointer is unchanged after calls") \
792 \
793 develop(bool, TraceJavaAssertions, false, \
794 "Trace java language assertions") \
795 \
796 notproduct(bool, CheckAssertionStatusDirectives, false, \
797 "Temporary - see javaClasses.cpp") \
798 \
799 notproduct(bool, PrintMallocFree, false, \
800 "Trace calls to C heap malloc/free allocation") \
801 \
802 product(bool, PrintOopAddress, false, \
803 "Always print the location of the oop") \
804 \
805 notproduct(bool, VerifyCodeCacheOften, false, \
806 "Verify compiled-code cache often") \
807 \
808 develop(bool, ZapDeadCompiledLocals, false, \
809 "Zap dead locals in compiler frames") \
810 \
811 notproduct(bool, ZapDeadLocalsOld, false, \
812 "Zap dead locals (old version, zaps all frames when " \
813 "entering the VM") \
814 \
815 notproduct(bool, CheckOopishValues, false, \
816 "Warn if value contains oop (requires ZapDeadLocals)") \
817 \
818 develop(bool, UseMallocOnly, false, \
819 "Use only malloc/free for allocation (no resource area/arena)") \
820 \
821 develop(bool, PrintMalloc, false, \
822 "Print all malloc/free calls") \
823 \
824 develop(bool, PrintMallocStatistics, false, \
825 "Print malloc/free statistics") \
826 \
827 develop(bool, ZapResourceArea, trueInDebug, \
828 "Zap freed resource/arena space with 0xABABABAB") \
829 \
830 notproduct(bool, ZapVMHandleArea, trueInDebug, \
831 "Zap freed VM handle space with 0xBCBCBCBC") \
832 \
833 develop(bool, ZapJNIHandleArea, trueInDebug, \
834 "Zap freed JNI handle space with 0xFEFEFEFE") \
835 \
836 notproduct(bool, ZapStackSegments, trueInDebug, \
837 "Zap allocated/freed stack segments with 0xFADFADED") \
838 \
839 develop(bool, ZapUnusedHeapArea, trueInDebug, \
840 "Zap unused heap space with 0xBAADBABE") \
841 \
842 develop(bool, TraceZapUnusedHeapArea, false, \
843 "Trace zapping of unused heap space") \
844 \
845 develop(bool, CheckZapUnusedHeapArea, false, \
846 "Check zapping of unused heap space") \
847 \
848 develop(bool, ZapFillerObjects, trueInDebug, \
849 "Zap filler objects with 0xDEAFBABE") \
850 \
851 develop(bool, PrintVMMessages, true, \
852 "Print VM messages on console") \
853 \
854 product(bool, PrintGCApplicationConcurrentTime, false, \
855 "Print the time the application has been running") \
856 \
857 product(bool, PrintGCApplicationStoppedTime, false, \
858 "Print the time the application has been stopped") \
859 \
860 diagnostic(bool, VerboseVerification, false, \
861 "Display detailed verification details") \
862 \
863 notproduct(uintx, ErrorHandlerTest, 0, \
864 "If > 0, provokes an error after VM initialization; the value " \
865 "determines which error to provoke. See test_error_handler() " \
866 "in debug.cpp.") \
867 \
868 develop(bool, Verbose, false, \
869 "Print additional debugging information from other modes") \
870 \
871 develop(bool, PrintMiscellaneous, false, \
872 "Print uncategorized debugging information (requires +Verbose)") \
873 \
874 develop(bool, WizardMode, false, \
875 "Print much more debugging information") \
876 \
877 product(bool, ShowMessageBoxOnError, false, \
878 "Keep process alive on VM fatal error") \
879 \
880 product(bool, CreateMinidumpOnCrash, false, \
881 "Create minidump on VM fatal error") \
882 \
883 product_pd(bool, UseOSErrorReporting, \
884 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
885 \
886 product(bool, SuppressFatalErrorMessage, false, \
887 "Report NO fatal error message (avoid deadlock)") \
888 \
889 product(ccstrlist, OnError, "", \
890 "Run user-defined commands on fatal error; see VMError.cpp " \
891 "for examples") \
892 \
893 product(ccstrlist, OnOutOfMemoryError, "", \
894 "Run user-defined commands on first java.lang.OutOfMemoryError") \
895 \
896 manageable(bool, HeapDumpBeforeFullGC, false, \
897 "Dump heap to file before any major stop-the-world GC") \
898 \
899 manageable(bool, HeapDumpAfterFullGC, false, \
900 "Dump heap to file after any major stop-the-world GC") \
901 \
902 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
903 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
904 \
905 manageable(ccstr, HeapDumpPath, NULL, \
906 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
907 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
908 "in the working directory)") \
909 \
910 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
911 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
912 "when the heap usage is larger than this") \
913 \
914 develop(uintx, HeapDumpSegmentSize, 1*G, \
915 "Approximate segment size when generating a segmented heap dump") \
916 \
917 develop(bool, BreakAtWarning, false, \
918 "Execute breakpoint upon encountering VM warning") \
919 \
920 develop(bool, TraceVMOperation, false, \
921 "Trace VM operations") \
922 \
923 develop(bool, UseFakeTimers, false, \
924 "Tell whether the VM should use system time or a fake timer") \
925 \
926 product(ccstr, NativeMemoryTracking, "off", \
927 "Native memory tracking options") \
928 \
929 diagnostic(bool, PrintNMTStatistics, false, \
930 "Print native memory tracking summary data if it is on") \
931 \
932 diagnostic(bool, AutoShutdownNMT, true, \
933 "Automatically shutdown native memory tracking under stress " \
934 "situations. When set to false, native memory tracking tries to " \
935 "stay alive at the expense of JVM performance") \
936 \
937 diagnostic(bool, LogCompilation, false, \
938 "Log compilation activity in detail to LogFile") \
939 \
940 product(bool, PrintCompilation, false, \
941 "Print compilations") \
942 \
943 diagnostic(bool, TraceNMethodInstalls, false, \
944 "Trace nmethod installation") \
945 \
946 diagnostic(intx, ScavengeRootsInCode, 2, \
947 "0: do not allow scavengable oops in the code cache; " \
948 "1: allow scavenging from the code cache; " \
949 "2: emit as many constants as the compiler can see") \
950 \
951 product(bool, AlwaysRestoreFPU, false, \
952 "Restore the FPU control word after every JNI call (expensive)") \
953 \
954 diagnostic(bool, PrintCompilation2, false, \
955 "Print additional statistics per compilation") \
956 \
957 diagnostic(bool, PrintAdapterHandlers, false, \
958 "Print code generated for i2c/c2i adapters") \
959 \
960 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
961 "Verify that i2c/c2i adapters are called properly") \
962 \
963 develop(bool, VerifyAdapterSharing, false, \
964 "Verify that the code for shared adapters is the equivalent") \
965 \
966 diagnostic(bool, PrintAssembly, false, \
967 "Print assembly code (using external disassembler.so)") \
968 \
969 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
970 "Print options string passed to disassembler.so") \
971 \
972 diagnostic(bool, PrintNMethods, false, \
973 "Print assembly code for nmethods when generated") \
974 \
975 diagnostic(bool, PrintNativeNMethods, false, \
976 "Print assembly code for native nmethods when generated") \
977 \
978 develop(bool, PrintDebugInfo, false, \
979 "Print debug information for all nmethods when generated") \
980 \
981 develop(bool, PrintRelocations, false, \
982 "Print relocation information for all nmethods when generated") \
983 \
984 develop(bool, PrintDependencies, false, \
985 "Print dependency information for all nmethods when generated") \
986 \
987 develop(bool, PrintExceptionHandlers, false, \
988 "Print exception handler tables for all nmethods when generated") \
989 \
990 develop(bool, StressCompiledExceptionHandlers, false, \
991 "Exercise compiled exception handlers") \
992 \
993 develop(bool, InterceptOSException, false, \
994 "Start debugger when an implicit OS (e.g. NULL) " \
995 "exception happens") \
996 \
997 product(bool, PrintCodeCache, false, \
998 "Print the code cache memory usage when exiting") \
999 \
1000 develop(bool, PrintCodeCache2, false, \
1001 "Print detailed usage information on the code cache when exiting")\
1002 \
1003 product(bool, PrintCodeCacheOnCompilation, false, \
1004 "Print the code cache memory usage each time a method is " \
1005 "compiled") \
1006 \
1007 diagnostic(bool, PrintStubCode, false, \
1008 "Print generated stub code") \
1009 \
1010 product(bool, StackTraceInThrowable, true, \
1011 "Collect backtrace in throwable when exception happens") \
1012 \
1013 product(bool, OmitStackTraceInFastThrow, true, \
1014 "Omit backtraces for some 'hot' exceptions in optimized code") \
1015 \
1016 product(bool, ProfilerPrintByteCodeStatistics, false, \
1017 "Print bytecode statistics when dumping profiler output") \
1018 \
1019 product(bool, ProfilerRecordPC, false, \
1020 "Collect ticks for each 16 byte interval of compiled code") \
1021 \
1022 product(bool, ProfileVM, false, \
1023 "Profile ticks that fall within VM (either in the VM Thread " \
1024 "or VM code called through stubs)") \
1025 \
1026 product(bool, ProfileIntervals, false, \
1027 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1028 \
1029 notproduct(bool, ProfilerCheckIntervals, false, \
1030 "Collect and print information on spacing of profiler ticks") \
1031 \
1032 develop(bool, PrintJVMWarnings, false, \
1033 "Print warnings for unimplemented JVM functions") \
1034 \
1035 product(bool, PrintWarnings, true, \
1036 "Print JVM warnings to output stream") \
1037 \
1038 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1039 "Print warnings for stalled SpinLocks") \
1040 \
1041 product(bool, RegisterFinalizersAtInit, true, \
1042 "Register finalizable objects at end of Object.<init> or " \
1043 "after allocation") \
1044 \
1045 develop(bool, RegisterReferences, true, \
1046 "Tell whether the VM should register soft/weak/final/phantom " \
1047 "references") \
1048 \
1049 develop(bool, IgnoreRewrites, false, \
1050 "Suppress rewrites of bytecodes in the oopmap generator. " \
1051 "This is unsafe!") \
1052 \
1053 develop(bool, PrintCodeCacheExtension, false, \
1054 "Print extension of code cache") \
1055 \
1056 develop(bool, UsePrivilegedStack, true, \
1057 "Enable the security JVM functions") \
1058 \
1059 develop(bool, ProtectionDomainVerification, true, \
1060 "Verify protection domain before resolution in system dictionary")\
1061 \
1062 product(bool, ClassUnloading, true, \
1063 "Do unloading of classes") \
1064 \
1065 develop(bool, DisableStartThread, false, \
1066 "Disable starting of additional Java threads " \
1067 "(for debugging only)") \
1068 \
1069 develop(bool, MemProfiling, false, \
1070 "Write memory usage profiling to log file") \
1071 \
1072 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1073 "Print the system dictionary at exit") \
1074 \
1075 experimental(intx, PredictedLoadedClassCount, 0, \
1076 "Experimental: Tune loaded class cache starting size") \
1077 \
1078 diagnostic(bool, UnsyncloadClass, false, \
1079 "Unstable: VM calls loadClass unsynchronized. Custom " \
1080 "class loader must call VM synchronized for findClass " \
1081 "and defineClass.") \
1082 \
1083 product(bool, AlwaysLockClassLoader, false, \
1084 "Require the VM to acquire the class loader lock before calling " \
1085 "loadClass() even for class loaders registering " \
1086 "as parallel capable") \
1087 \
1088 product(bool, AllowParallelDefineClass, false, \
1089 "Allow parallel defineClass requests for class loaders " \
1090 "registering as parallel capable") \
1091 \
1092 product(bool, MustCallLoadClassInternal, false, \
1093 "Call loadClassInternal() rather than loadClass()") \
1094 \
1095 product_pd(bool, DontYieldALot, \
1096 "Throw away obvious excess yield calls (for Solaris only)") \
1097 \
1098 product_pd(bool, ConvertSleepToYield, \
1099 "Convert sleep(0) to thread yield " \
1100 "(may be off for Solaris to improve GUI)") \
1101 \
1102 product(bool, ConvertYieldToSleep, false, \
1103 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1104 "behavior (Solaris only)") \
1105 \
1106 product(bool, UseBoundThreads, true, \
1107 "Bind user level threads to kernel threads (for Solaris only)") \
1108 \
1109 develop(bool, UseDetachedThreads, true, \
1110 "Use detached threads that are recycled upon termination " \
1111 "(for Solaris only)") \
1112 \
1113 product(bool, UseLWPSynchronization, true, \
1114 "Use LWP-based instead of libthread-based synchronization " \
1115 "(SPARC only)") \
1116 \
1117 product(ccstr, SyncKnobs, NULL, \
1118 "(Unstable) Various monitor synchronization tunables") \
1119 \
1120 product(intx, EmitSync, 0, \
1121 "(Unsafe, Unstable) " \
1122 "Control emission of inline sync fast-path code") \
1123 \
1124 product(intx, MonitorBound, 0, "Bound Monitor population") \
1125 \
1126 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1127 \
1128 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1129 \
1130 product(intx, SyncVerbose, 0, "(Unstable)") \
1131 \
1132 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1133 \
1134 product(intx, hashCode, 5, \
1135 "(Unstable) select hashCode generation algorithm") \
1136 \
1137 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1138 "(Unstable, Linux-specific) " \
1139 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1140 \
1141 product(bool, FilterSpuriousWakeups, true, \
1142 "Prevent spurious or premature wakeups from object.wait " \
1143 "(Solaris only)") \
1144 \
1145 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1146 \
1147 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1148 \
1149 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1150 \
1151 develop(bool, UsePthreads, false, \
1152 "Use pthread-based instead of libthread-based synchronization " \
1153 "(SPARC only)") \
1154 \
1155 product(bool, AdjustConcurrency, false, \
1156 "Call thr_setconcurrency at thread creation time to avoid " \
1157 "LWP starvation on MP systems (for Solaris Only)") \
1158 \
1159 product(bool, ReduceSignalUsage, false, \
1160 "Reduce the use of OS signals in Java and/or the VM") \
1161 \
1162 develop_pd(bool, ShareVtableStubs, \
1163 "Share vtable stubs (smaller code but worse branch prediction") \
1164 \
1165 develop(bool, LoadLineNumberTables, true, \
1166 "Tell whether the class file parser loads line number tables") \
1167 \
1168 develop(bool, LoadLocalVariableTables, true, \
1169 "Tell whether the class file parser loads local variable tables") \
1170 \
1171 develop(bool, LoadLocalVariableTypeTables, true, \
1172 "Tell whether the class file parser loads local variable type" \
1173 "tables") \
1174 \
1175 product(bool, AllowUserSignalHandlers, false, \
1176 "Do not complain if the application installs signal handlers " \
1177 "(Solaris & Linux only)") \
1178 \
1179 product(bool, UseSignalChaining, true, \
1180 "Use signal-chaining to invoke signal handlers installed " \
1181 "by the application (Solaris & Linux only)") \
1182 \
1183 product(bool, UseAltSigs, false, \
1184 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1185 "internal signals (Solaris only)") \
1186 \
1187 product(bool, AllowJNIEnvProxy, false, \
1188 "Allow JNIEnv proxies for jdbx") \
1189 \
1190 product(bool, JNIDetachReleasesMonitors, true, \
1191 "JNI DetachCurrentThread releases monitors owned by thread") \
1192 \
1193 product(bool, RestoreMXCSROnJNICalls, false, \
1194 "Restore MXCSR when returning from JNI calls") \
1195 \
1196 product(bool, CheckJNICalls, false, \
1197 "Verify all arguments to JNI calls") \
1198 \
1199 product(bool, UseFastJNIAccessors, true, \
1200 "Use optimized versions of Get<Primitive>Field") \
1201 \
1202 product(bool, EagerXrunInit, false, \
1203 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1204 "but not all -Xrun libraries may support the state of the VM " \
1205 "at this time") \
1206 \
1207 product(bool, PreserveAllAnnotations, false, \
1208 "Preserve RuntimeInvisibleAnnotations as well " \
1209 "as RuntimeVisibleAnnotations") \
1210 \
1211 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1212 "Number of OutOfMemoryErrors preallocated with backtrace") \
1213 \
1214 product(bool, LazyBootClassLoader, true, \
1215 "Enable/disable lazy opening of boot class path entries") \
1216 \
1217 product(bool, UseXMMForArrayCopy, false, \
1218 "Use SSE2 MOVQ instruction for Arraycopy") \
1219 \
1220 product(intx, FieldsAllocationStyle, 1, \
1221 "0 - type based with oops first, 1 - with oops last, " \
1222 "2 - oops in super and sub classes are together") \
1223 \
1224 product(bool, CompactFields, true, \
1225 "Allocate nonstatic fields in gaps between previous fields") \
1226 \
1227 notproduct(bool, PrintFieldLayout, false, \
1228 "Print field layout for each class") \
1229 \
1230 product(intx, ContendedPaddingWidth, 128, \
1231 "How many bytes to pad the fields/classes marked @Contended with")\
1232 \
1233 product(bool, EnableContended, true, \
1234 "Enable @Contended annotation support") \
1235 \
1236 product(bool, RestrictContended, true, \
1237 "Restrict @Contended to trusted classes") \
1238 \
1239 product(bool, UseBiasedLocking, true, \
1240 "Enable biased locking in JVM") \
1241 \
1242 product(intx, BiasedLockingStartupDelay, 4000, \
1243 "Number of milliseconds to wait before enabling biased locking") \
1244 \
1245 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1246 "Print statistics of biased locking in JVM") \
1247 \
1248 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1249 "Threshold of number of revocations per type to try to " \
1250 "rebias all objects in the heap of that type") \
1251 \
1252 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1253 "Threshold of number of revocations per type to permanently " \
1254 "revoke biases of all objects in the heap of that type") \
1255 \
1256 product(intx, BiasedLockingDecayTime, 25000, \
1257 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1258 "type after previous bulk rebias") \
1259 \
1260 /* tracing */ \
1261 \
1262 notproduct(bool, TraceRuntimeCalls, false, \
1263 "Trace run-time calls") \
1264 \
1265 develop(bool, TraceJNICalls, false, \
1266 "Trace JNI calls") \
1267 \
1268 develop(bool, StressRewriter, false, \
1269 "Stress linktime bytecode rewriting") \
1270 \
1271 notproduct(bool, TraceJVMCalls, false, \
1272 "Trace JVM calls") \
1273 \
1274 product(ccstr, TraceJVMTI, NULL, \
1275 "Trace flags for JVMTI functions and events") \
1276 \
1277 /* This option can change an EMCP method into an obsolete method. */ \
1278 /* This can affect tests that except specific methods to be EMCP. */ \
1279 /* This option should be used with caution. */ \
1280 product(bool, StressLdcRewrite, false, \
1281 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1282 \
1283 product(intx, TraceRedefineClasses, 0, \
1284 "Trace level for JVMTI RedefineClasses") \
1285 \
1286 develop(bool, StressMethodComparator, false, \
1287 "Run the MethodComparator on all loaded methods") \
1288 \
1289 /* change to false by default sometime after Mustang */ \
1290 product(bool, VerifyMergedCPBytecodes, true, \
1291 "Verify bytecodes after RedefineClasses constant pool merging") \
1292 \
1293 develop(bool, TraceJNIHandleAllocation, false, \
1294 "Trace allocation/deallocation of JNI handle blocks") \
1295 \
1296 develop(bool, TraceThreadEvents, false, \
1297 "Trace all thread events") \
1298 \
1299 develop(bool, TraceBytecodes, false, \
1300 "Trace bytecode execution") \
1301 \
1302 develop(bool, TraceClassInitialization, false, \
1303 "Trace class initialization") \
1304 \
1305 develop(bool, TraceExceptions, false, \
1306 "Trace exceptions") \
1307 \
1308 develop(bool, TraceICs, false, \
1309 "Trace inline cache changes") \
1310 \
1311 notproduct(bool, TraceInvocationCounterOverflow, false, \
1312 "Trace method invocation counter overflow") \
1313 \
1314 develop(bool, TraceInlineCacheClearing, false, \
1315 "Trace clearing of inline caches in nmethods") \
1316 \
1317 develop(bool, TraceDependencies, false, \
1318 "Trace dependencies") \
1319 \
1320 develop(bool, VerifyDependencies, trueInDebug, \
1321 "Exercise and verify the compilation dependency mechanism") \
1322 \
1323 develop(bool, TraceNewOopMapGeneration, false, \
1324 "Trace OopMapGeneration") \
1325 \
1326 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1327 "Trace OopMapGeneration: print detailed cell states") \
1328 \
1329 develop(bool, TimeOopMap, false, \
1330 "Time calls to GenerateOopMap::compute_map() in sum") \
1331 \
1332 develop(bool, TimeOopMap2, false, \
1333 "Time calls to GenerateOopMap::compute_map() individually") \
1334 \
1335 develop(bool, TraceMonitorMismatch, false, \
1336 "Trace monitor matching failures during OopMapGeneration") \
1337 \
1338 develop(bool, TraceOopMapRewrites, false, \
1339 "Trace rewriting of method oops during oop map generation") \
1340 \
1341 develop(bool, TraceSafepoint, false, \
1342 "Trace safepoint operations") \
1343 \
1344 develop(bool, TraceICBuffer, false, \
1345 "Trace usage of IC buffer") \
1346 \
1347 develop(bool, TraceCompiledIC, false, \
1348 "Trace changes of compiled IC") \
1349 \
1350 notproduct(bool, TraceZapDeadLocals, false, \
1351 "Trace zapping dead locals") \
1352 \
1353 develop(bool, TraceStartupTime, false, \
1354 "Trace setup time") \
1355 \
1356 develop(bool, TraceProtectionDomainVerification, false, \
1357 "Trace protection domain verification") \
1358 \
1359 develop(bool, TraceClearedExceptions, false, \
1360 "Print when an exception is forcibly cleared") \
1361 \
1362 product(bool, TraceClassResolution, false, \
1363 "Trace all constant pool resolutions (for debugging)") \
1364 \
1365 product(bool, TraceBiasedLocking, false, \
1366 "Trace biased locking in JVM") \
1367 \
1368 product(bool, TraceMonitorInflation, false, \
1369 "Trace monitor inflation in JVM") \
1370 \
1371 /* gc */ \
1372 \
1373 product(bool, UseSerialGC, false, \
1374 "Use the Serial garbage collector") \
1375 \
1376 product(bool, UseG1GC, false, \
1377 "Use the Garbage-First garbage collector") \
1378 \
1379 product(bool, UseParallelGC, false, \
1380 "Use the Parallel Scavenge garbage collector") \
1381 \
1382 product(bool, UseParallelOldGC, false, \
1383 "Use the Parallel Old garbage collector") \
1384 \
1385 product(uintx, HeapMaximumCompactionInterval, 20, \
1386 "How often should we maximally compact the heap (not allowing " \
1387 "any dead space)") \
1388 \
1389 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1390 "The collection count for the first maximum compaction") \
1391 \
1392 product(bool, UseMaximumCompactionOnSystemGC, true, \
1393 "Use maximum compaction in the Parallel Old garbage collector " \
1394 "for a system GC") \
1395 \
1396 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1397 "The mean used by the parallel compact dead wood " \
1398 "limiter (a number between 0-100)") \
1399 \
1400 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1401 "The standard deviation used by the parallel compact dead wood " \
1402 "limiter (a number between 0-100)") \
1403 \
1404 product(uintx, ParallelGCThreads, 0, \
1405 "Number of parallel threads parallel gc will use") \
1406 \
1407 product(bool, UseDynamicNumberOfGCThreads, false, \
1408 "Dynamically choose the number of parallel threads " \
1409 "parallel gc will use") \
1410 \
1411 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1412 "Force dynamic selection of the number of " \
1413 "parallel threads parallel gc will use to aid debugging") \
1414 \
1415 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1416 "Size of heap (bytes) per GC thread used in calculating the " \
1417 "number of GC threads") \
1418 \
1419 product(bool, TraceDynamicGCThreads, false, \
1420 "Trace the dynamic GC thread usage") \
1421 \
1422 develop(bool, ParallelOldGCSplitALot, false, \
1423 "Provoke splitting (copying data from a young gen space to " \
1424 "multiple destination spaces)") \
1425 \
1426 develop(uintx, ParallelOldGCSplitInterval, 3, \
1427 "How often to provoke splitting a young gen space") \
1428 \
1429 product(uintx, ConcGCThreads, 0, \
1430 "Number of threads concurrent gc will use") \
1431 \
1432 product(uintx, YoungPLABSize, 4096, \
1433 "Size of young gen promotion LAB's (in HeapWords)") \
1434 \
1435 product(uintx, OldPLABSize, 1024, \
1436 "Size of old gen promotion LAB's (in HeapWords)") \
1437 \
1438 product(uintx, GCTaskTimeStampEntries, 200, \
1439 "Number of time stamp entries per gc worker thread") \
1440 \
1441 product(bool, AlwaysTenure, false, \
1442 "Always tenure objects in eden (ParallelGC only)") \
1443 \
1444 product(bool, NeverTenure, false, \
1445 "Never tenure objects in eden, may tenure on overflow " \
1446 "(ParallelGC only)") \
1447 \
1448 product(bool, ScavengeBeforeFullGC, true, \
1449 "Scavenge youngest generation before each full GC, " \
1450 "used with UseParallelGC") \
1451 \
1452 develop(bool, ScavengeWithObjectsInToSpace, false, \
1453 "Allow scavenges to occur when to-space contains objects") \
1454 \
1455 product(bool, UseConcMarkSweepGC, false, \
1456 "Use Concurrent Mark-Sweep GC in the old generation") \
1457 \
1458 product(bool, ExplicitGCInvokesConcurrent, false, \
1459 "A System.gc() request invokes a concurrent collection; " \
1460 "(effective only when UseConcMarkSweepGC)") \
1461 \
1462 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1463 "A System.gc() request invokes a concurrent collection and " \
1464 "also unloads classes during such a concurrent gc cycle " \
1465 "(effective only when UseConcMarkSweepGC)") \
1466 \
1467 product(bool, GCLockerInvokesConcurrent, false, \
1468 "The exit of a JNI critical section necessitating a scavenge, " \
1469 "also kicks off a background concurrent collection") \
1470 \
1471 product(uintx, GCLockerEdenExpansionPercent, 5, \
1472 "How much the GC can expand the eden by while the GC locker " \
1473 "is active (as a percentage)") \
1474 \
1475 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1476 "Number of times to retry allocations when " \
1477 "blocked by the GC locker") \
1478 \
1479 develop(bool, UseCMSAdaptiveFreeLists, true, \
1480 "Use adaptive free lists in the CMS generation") \
1481 \
1482 develop(bool, UseAsyncConcMarkSweepGC, true, \
1483 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1484 \
1485 develop(bool, RotateCMSCollectionTypes, false, \
1486 "Rotate the CMS collections among concurrent and STW") \
1487 \
1488 product(bool, UseCMSBestFit, true, \
1489 "Use CMS best fit allocation strategy") \
1490 \
1491 product(bool, UseCMSCollectionPassing, true, \
1492 "Use passing of collection from background to foreground") \
1493 \
1494 product(bool, UseParNewGC, false, \
1495 "Use parallel threads in the new generation") \
1496 \
1497 product(bool, ParallelGCVerbose, false, \
1498 "Verbose output for parallel gc") \
1499 \
1500 product(uintx, ParallelGCBufferWastePct, 10, \
1501 "Wasted fraction of parallel allocation buffer") \
1502 \
1503 diagnostic(bool, ParallelGCRetainPLAB, false, \
1504 "Retain parallel allocation buffers across scavenges; " \
1505 "it is disabled because this currently conflicts with " \
1506 "parallel card scanning under certain conditions.") \
1507 \
1508 product(uintx, TargetPLABWastePct, 10, \
1509 "Target wasted space in last buffer as percent of overall " \
1510 "allocation") \
1511 \
1512 product(uintx, PLABWeight, 75, \
1513 "Percentage (0-100) used to weigh the current sample when " \
1514 "computing exponentially decaying average for ResizePLAB") \
1515 \
1516 product(bool, ResizePLAB, true, \
1517 "Dynamically resize (survivor space) promotion LAB's") \
1518 \
1519 product(bool, PrintPLAB, false, \
1520 "Print (survivor space) promotion LAB's sizing decisions") \
1521 \
1522 product(intx, ParGCArrayScanChunk, 50, \
1523 "Scan a subset of object array and push remainder, if array is " \
1524 "bigger than this") \
1525 \
1526 product(bool, ParGCUseLocalOverflow, false, \
1527 "Instead of a global overflow list, use local overflow stacks") \
1528 \
1529 product(bool, ParGCTrimOverflow, true, \
1530 "Eagerly trim the local overflow lists " \
1531 "(when ParGCUseLocalOverflow)") \
1532 \
1533 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1534 "Simulate work queue overflow in ParNew") \
1535 \
1536 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1537 "An `interval' counter that determines how frequently " \
1538 "we simulate overflow; a smaller number increases frequency") \
1539 \
1540 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1541 "The desired number of objects to claim from the overflow list") \
1542 \
1543 diagnostic(uintx, ParGCStridesPerThread, 2, \
1544 "The number of strides per worker thread that we divide up the " \
1545 "card table scanning work into") \
1546 \
1547 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1548 "The number of cards in each chunk of the parallel chunks used " \
1549 "during card table scanning") \
1550 \
1551 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1552 "Number of blocks to attempt to claim when refilling CMS LAB's " \
1553 "for parallel GC") \
1554 \
1555 product(uintx, OldPLABWeight, 50, \
1556 "Percentage (0-100) used to weight the current sample when " \
1557 "computing exponentially decaying average for resizing " \
1558 "CMSParPromoteBlocksToClaim") \
1559 \
1560 product(bool, ResizeOldPLAB, true, \
1561 "Dynamically resize (old gen) promotion LAB's") \
1562 \
1563 product(bool, PrintOldPLAB, false, \
1564 "Print (old gen) promotion LAB's sizing decisions") \
1565 \
1566 product(uintx, CMSOldPLABMin, 16, \
1567 "Minimum size of CMS gen promotion LAB caches per worker " \
1568 "per block size") \
1569 \
1570 product(uintx, CMSOldPLABMax, 1024, \
1571 "Maximum size of CMS gen promotion LAB caches per worker " \
1572 "per block size") \
1573 \
1574 product(uintx, CMSOldPLABNumRefills, 4, \
1575 "Nominal number of refills of CMS gen promotion LAB cache " \
1576 "per worker per block size") \
1577 \
1578 product(bool, CMSOldPLABResizeQuicker, false, \
1579 "React on-the-fly during a scavenge to a sudden " \
1580 "change in block demand rate") \
1581 \
1582 product(uintx, CMSOldPLABToleranceFactor, 4, \
1583 "The tolerance of the phase-change detector for on-the-fly " \
1584 "PLAB resizing during a scavenge") \
1585 \
1586 product(uintx, CMSOldPLABReactivityFactor, 2, \
1587 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1588 "during a scavenge") \
1589 \
1590 product(bool, AlwaysPreTouch, false, \
1591 "Force all freshly committed pages to be pre-touched") \
1592 \
1593 product_pd(uintx, CMSYoungGenPerWorker, \
1594 "The maximum size of young gen chosen by default per GC worker " \
1595 "thread available") \
1596 \
1597 product(bool, CMSIncrementalMode, false, \
1598 "Whether CMS GC should operate in \"incremental\" mode") \
1599 \
1600 product(uintx, CMSIncrementalDutyCycle, 10, \
1601 "Percentage (0-100) of CMS incremental mode duty cycle. If " \
1602 "CMSIncrementalPacing is enabled, then this is just the initial " \
1603 "value.") \
1604 \
1605 product(bool, CMSIncrementalPacing, true, \
1606 "Whether the CMS incremental mode duty cycle should be " \
1607 "automatically adjusted") \
1608 \
1609 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1610 "Minimum percentage (0-100) of the CMS incremental duty cycle " \
1611 "used when CMSIncrementalPacing is enabled") \
1612 \
1613 product(uintx, CMSIncrementalSafetyFactor, 10, \
1614 "Percentage (0-100) used to add conservatism when computing the " \
1615 "duty cycle") \
1616 \
1617 product(uintx, CMSIncrementalOffset, 0, \
1618 "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1619 "is shifted to the right within the period between young GCs") \
1620 \
1621 product(uintx, CMSExpAvgFactor, 50, \
1622 "Percentage (0-100) used to weigh the current sample when " \
1623 "computing exponential averages for CMS statistics") \
1624 \
1625 product(uintx, CMS_FLSWeight, 75, \
1626 "Percentage (0-100) used to weigh the current sample when " \
1627 "computing exponentially decaying averages for CMS FLS " \
1628 "statistics") \
1629 \
1630 product(uintx, CMS_FLSPadding, 1, \
1631 "The multiple of deviation from mean to use for buffering " \
1632 "against volatility in free list demand") \
1633 \
1634 product(uintx, FLSCoalescePolicy, 2, \
1635 "CMS: aggressiveness level for coalescing, increasing " \
1636 "from 0 to 4") \
1637 \
1638 product(bool, FLSAlwaysCoalesceLarge, false, \
1639 "CMS: larger free blocks are always available for coalescing") \
1640 \
1641 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1642 "CMS: the smaller the percentage the greater the coalescing " \
1643 "force") \
1644 \
1645 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1646 "CMS: the factor by which to inflate estimated demand of small " \
1647 "block sizes to prevent coalescing with an adjoining block") \
1648 \
1649 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1650 "CMS: the factor by which to inflate estimated demand of large " \
1651 "block sizes to prevent coalescing with an adjoining block") \
1652 \
1653 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1654 "CMS: the factor by which to inflate estimated demand of small " \
1655 "block sizes to prevent splitting to supply demand for smaller " \
1656 "blocks") \
1657 \
1658 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1659 "CMS: the factor by which to inflate estimated demand of large " \
1660 "block sizes to prevent splitting to supply demand for smaller " \
1661 "blocks") \
1662 \
1663 product(bool, CMSExtrapolateSweep, false, \
1664 "CMS: cushion for block demand during sweep") \
1665 \
1666 product(uintx, CMS_SweepWeight, 75, \
1667 "Percentage (0-100) used to weight the current sample when " \
1668 "computing exponentially decaying average for inter-sweep " \
1669 "duration") \
1670 \
1671 product(uintx, CMS_SweepPadding, 1, \
1672 "The multiple of deviation from mean to use for buffering " \
1673 "against volatility in inter-sweep duration") \
1674 \
1675 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1676 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1677 "duration exceeds this threshold in milliseconds") \
1678 \
1679 develop(bool, CMSTraceIncrementalMode, false, \
1680 "Trace CMS incremental mode") \
1681 \
1682 develop(bool, CMSTraceIncrementalPacing, false, \
1683 "Trace CMS incremental mode pacing computation") \
1684 \
1685 develop(bool, CMSTraceThreadState, false, \
1686 "Trace the CMS thread state (enable the trace_state() method)") \
1687 \
1688 product(bool, CMSClassUnloadingEnabled, true, \
1689 "Whether class unloading enabled when using CMS GC") \
1690 \
1691 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1692 "When CMS class unloading is enabled, the maximum CMS cycle " \
1693 "count for which classes may not be unloaded") \
1694 \
1695 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1696 "Compact when asked to collect CMS gen with " \
1697 "clear_all_soft_refs()") \
1698 \
1699 product(bool, UseCMSCompactAtFullCollection, true, \
1700 "Use Mark-Sweep-Compact algorithm at full collections") \
1701 \
1702 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1703 "Number of CMS full collection done before compaction if > 0") \
1704 \
1705 develop(intx, CMSDictionaryChoice, 0, \
1706 "Use BinaryTreeDictionary as default in the CMS generation") \
1707 \
1708 product(uintx, CMSIndexedFreeListReplenish, 4, \
1709 "Replenish an indexed free list with this number of chunks") \
1710 \
1711 product(bool, CMSReplenishIntermediate, true, \
1712 "Replenish all intermediate free-list caches") \
1713 \
1714 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1715 "When satisfying batched demand, split blocks from the " \
1716 "IndexedFreeList whose size is a multiple of requested size") \
1717 \
1718 product(bool, CMSLoopWarn, false, \
1719 "Warn in case of excessive CMS looping") \
1720 \
1721 develop(bool, CMSOverflowEarlyRestoration, false, \
1722 "Restore preserved marks early") \
1723 \
1724 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1725 "Size of marking stack") \
1726 \
1727 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1728 "Maximum size of marking stack") \
1729 \
1730 notproduct(bool, CMSMarkStackOverflowALot, false, \
1731 "Simulate frequent marking stack / work queue overflow") \
1732 \
1733 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1734 "An \"interval\" counter that determines how frequently " \
1735 "to simulate overflow; a smaller number increases frequency") \
1736 \
1737 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1738 "(Temporary, subject to experimentation) " \
1739 "Maximum number of abortable preclean iterations, if > 0") \
1740 \
1741 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1742 "(Temporary, subject to experimentation) " \
1743 "Maximum time in abortable preclean (in milliseconds)") \
1744 \
1745 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1746 "(Temporary, subject to experimentation) " \
1747 "Nominal minimum work per abortable preclean iteration") \
1748 \
1749 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1750 "(Temporary, subject to experimentation) " \
1751 "Time that we sleep between iterations when not given " \
1752 "enough work per iteration") \
1753 \
1754 product(uintx, CMSRescanMultiple, 32, \
1755 "Size (in cards) of CMS parallel rescan task") \
1756 \
1757 product(uintx, CMSConcMarkMultiple, 32, \
1758 "Size (in cards) of CMS concurrent MT marking task") \
1759 \
1760 product(bool, CMSAbortSemantics, false, \
1761 "Whether abort-on-overflow semantics is implemented") \
1762 \
1763 product(bool, CMSParallelInitialMarkEnabled, true, \
1764 "Use the parallel initial mark.") \
1765 \
1766 product(bool, CMSParallelRemarkEnabled, true, \
1767 "Whether parallel remark enabled (only if ParNewGC)") \
1768 \
1769 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1770 "Whether parallel remark of survivor space " \
1771 "enabled (effective only if CMSParallelRemarkEnabled)") \
1772 \
1773 product(bool, CMSPLABRecordAlways, true, \
1774 "Always record survivor space PLAB boundaries (effective only " \
1775 "if CMSParallelSurvivorRemarkEnabled)") \
1776 \
1777 product(bool, CMSEdenChunksRecordAlways, true, \
1778 "Always record eden chunks used for the parallel initial mark " \
1779 "or remark of eden") \
1780 \
1781 product(bool, CMSPrintEdenSurvivorChunks, false, \
1782 "Print the eden and the survivor chunks used for the parallel " \
1783 "initial mark or remark of the eden/survivor spaces") \
1784 \
1785 product(bool, CMSConcurrentMTEnabled, true, \
1786 "Whether multi-threaded concurrent work enabled " \
1787 "(effective only if ParNewGC)") \
1788 \
1789 product(bool, CMSPrecleaningEnabled, true, \
1790 "Whether concurrent precleaning enabled") \
1791 \
1792 product(uintx, CMSPrecleanIter, 3, \
1793 "Maximum number of precleaning iteration passes") \
1794 \
1795 product(uintx, CMSPrecleanNumerator, 2, \
1796 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1797 "ratio") \
1798 \
1799 product(uintx, CMSPrecleanDenominator, 3, \
1800 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1801 "ratio") \
1802 \
1803 product(bool, CMSPrecleanRefLists1, true, \
1804 "Preclean ref lists during (initial) preclean phase") \
1805 \
1806 product(bool, CMSPrecleanRefLists2, false, \
1807 "Preclean ref lists during abortable preclean phase") \
1808 \
1809 product(bool, CMSPrecleanSurvivors1, false, \
1810 "Preclean survivors during (initial) preclean phase") \
1811 \
1812 product(bool, CMSPrecleanSurvivors2, true, \
1813 "Preclean survivors during abortable preclean phase") \
1814 \
1815 product(uintx, CMSPrecleanThreshold, 1000, \
1816 "Do not iterate again if number of dirty cards is less than this")\
1817 \
1818 product(bool, CMSCleanOnEnter, true, \
1819 "Clean-on-enter optimization for reducing number of dirty cards") \
1820 \
1821 product(uintx, CMSRemarkVerifyVariant, 1, \
1822 "Choose variant (1,2) of verification following remark") \
1823 \
1824 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1825 "If Eden size is below this, do not try to schedule remark") \
1826 \
1827 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1828 "The Eden occupancy percentage (0-100) at which " \
1829 "to try and schedule remark pause") \
1830 \
1831 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1832 "Start sampling eden top at least before young gen " \
1833 "occupancy reaches 1/<ratio> of the size at which " \
1834 "we plan to schedule remark") \
1835 \
1836 product(uintx, CMSSamplingGrain, 16*K, \
1837 "The minimum distance between eden samples for CMS (see above)") \
1838 \
1839 product(bool, CMSScavengeBeforeRemark, false, \
1840 "Attempt scavenge before the CMS remark step") \
1841 \
1842 develop(bool, CMSTraceSweeper, false, \
1843 "Trace some actions of the CMS sweeper") \
1844 \
1845 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1846 "Don't drain below this size per parallel worker/thief") \
1847 \
1848 manageable(intx, CMSWaitDuration, 2000, \
1849 "Time in milliseconds that CMS thread waits for young GC") \
1850 \
1851 develop(uintx, CMSCheckInterval, 1000, \
1852 "Interval in milliseconds that CMS thread checks if it " \
1853 "should start a collection cycle") \
1854 \
1855 product(bool, CMSYield, true, \
1856 "Yield between steps of CMS") \
1857 \
1858 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1859 "Bitmap operations should process at most this many bits " \
1860 "between yields") \
1861 \
1862 product(bool, CMSDumpAtPromotionFailure, false, \
1863 "Dump useful information about the state of the CMS old " \
1864 "generation upon a promotion failure") \
1865 \
1866 product(bool, CMSPrintChunksInDump, false, \
1867 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1868 "more detailed information about the free chunks") \
1869 \
1870 product(bool, CMSPrintObjectsInDump, false, \
1871 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1872 "more detailed information about the allocated objects") \
1873 \
1874 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1875 "Verify that all references across the FLS boundary " \
1876 "are to valid objects") \
1877 \
1878 diagnostic(bool, FLSVerifyLists, false, \
1879 "Do lots of (expensive) FreeListSpace verification") \
1880 \
1881 diagnostic(bool, FLSVerifyIndexTable, false, \
1882 "Do lots of (expensive) FLS index table verification") \
1883 \
1884 develop(bool, FLSVerifyDictionary, false, \
1885 "Do lots of (expensive) FLS dictionary verification") \
1886 \
1887 develop(bool, VerifyBlockOffsetArray, false, \
1888 "Do (expensive) block offset array verification") \
1889 \
1890 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1891 "Maintain _unallocated_block in BlockOffsetArray " \
1892 "(currently applicable only to CMS collector)") \
1893 \
1894 develop(bool, TraceCMSState, false, \
1895 "Trace the state of the CMS collection") \
1896 \
1897 product(intx, RefDiscoveryPolicy, 0, \
1898 "Select type of reference discovery policy: " \
1899 "reference-based(0) or referent-based(1)") \
1900 \
1901 product(bool, ParallelRefProcEnabled, false, \
1902 "Enable parallel reference processing whenever possible") \
1903 \
1904 product(bool, ParallelRefProcBalancingEnabled, true, \
1905 "Enable balancing of reference processing queues") \
1906 \
1907 product(uintx, CMSTriggerRatio, 80, \
1908 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1909 "allocated before a CMS collection cycle commences") \
1910 \
1911 product(uintx, CMSBootstrapOccupancy, 50, \
1912 "Percentage CMS generation occupancy at which to " \
1913 "initiate CMS collection for bootstrapping collection stats") \
1914 \
1915 product(intx, CMSInitiatingOccupancyFraction, -1, \
1916 "Percentage CMS generation occupancy to start a CMS collection " \
1917 "cycle. A negative value means that CMSTriggerRatio is used") \
1918 \
1919 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1920 "Percentage of the (entire) heap occupancy to start a " \
1921 "concurrent GC cycle. It is used by GCs that trigger a " \
1922 "concurrent GC cycle based on the occupancy of the entire heap, " \
1923 "not just one of the generations (e.g., G1). A value of 0 " \
1924 "denotes 'do constant GC cycles'.") \
1925 \
1926 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1927 "Only use occupancy as a criterion for starting a CMS collection")\
1928 \
1929 product(uintx, CMSIsTooFullPercentage, 98, \
1930 "An absolute ceiling above which CMS will always consider the " \
1931 "unloading of classes when class unloading is enabled") \
1932 \
1933 develop(bool, CMSTestInFreeList, false, \
1934 "Check if the coalesced range is already in the " \
1935 "free lists as claimed") \
1936 \
1937 notproduct(bool, CMSVerifyReturnedBytes, false, \
1938 "Check that all the garbage collected was returned to the " \
1939 "free lists") \
1940 \
1941 notproduct(bool, ScavengeALot, false, \
1942 "Force scavenge at every Nth exit from the runtime system " \
1943 "(N=ScavengeALotInterval)") \
1944 \
1945 develop(bool, FullGCALot, false, \
1946 "Force full gc at every Nth exit from the runtime system " \
1947 "(N=FullGCALotInterval)") \
1948 \
1949 notproduct(bool, GCALotAtAllSafepoints, false, \
1950 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1951 \
1952 product(bool, PrintPromotionFailure, false, \
1953 "Print additional diagnostic information following " \
1954 "promotion failure") \
1955 \
1956 notproduct(bool, PromotionFailureALot, false, \
1957 "Use promotion failure handling on every youngest generation " \
1958 "collection") \
1959 \
1960 develop(uintx, PromotionFailureALotCount, 1000, \
1961 "Number of promotion failures occurring at ParGCAllocBuffer " \
1962 "refill attempts (ParNew) or promotion attempts " \
1963 "(other young collectors)") \
1964 \
1965 develop(uintx, PromotionFailureALotInterval, 5, \
1966 "Total collections between promotion failures alot") \
1967 \
1968 experimental(uintx, WorkStealingSleepMillis, 1, \
1969 "Sleep time when sleep is used for yields") \
1970 \
1971 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1972 "Number of yields before a sleep is done during workstealing") \
1973 \
1974 experimental(uintx, WorkStealingHardSpins, 4096, \
1975 "Number of iterations in a spin loop between checks on " \
1976 "time out of hard spin") \
1977 \
1978 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1979 "Ratio of hard spins to calls to yield") \
1980 \
1981 develop(uintx, ObjArrayMarkingStride, 512, \
1982 "Number of object array elements to push onto the marking stack " \
1983 "before pushing a continuation entry") \
1984 \
1985 develop(bool, MetadataAllocationFailALot, false, \
1986 "Fail metadata allocations at intervals controlled by " \
1987 "MetadataAllocationFailALotInterval") \
1988 \
1989 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1990 "Metadata allocation failure a lot interval") \
1991 \
1992 develop(bool, TraceMetadataChunkAllocation, false, \
1993 "Trace chunk metadata allocations") \
1994 \
1995 product(bool, TraceMetadataHumongousAllocation, false, \
1996 "Trace humongous metadata allocations") \
1997 \
1998 develop(bool, TraceMetavirtualspaceAllocation, false, \
1999 "Trace virtual space metadata allocations") \
2000 \
2001 notproduct(bool, ExecuteInternalVMTests, false, \
2002 "Enable execution of internal VM tests") \
2003 \
2004 notproduct(bool, VerboseInternalVMTests, false, \
2005 "Turn on logging for internal VM tests.") \
2006 \
2007 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2008 \
2009 product_pd(bool, ResizeTLAB, \
2010 "Dynamically resize TLAB size for threads") \
2011 \
2012 product(bool, ZeroTLAB, false, \
2013 "Zero out the newly created TLAB") \
2014 \
2015 product(bool, FastTLABRefill, true, \
2016 "Use fast TLAB refill code") \
2017 \
2018 product(bool, PrintTLAB, false, \
2019 "Print various TLAB related information") \
2020 \
2021 product(bool, TLABStats, true, \
2022 "Provide more detailed and expensive TLAB statistics " \
2023 "(with PrintTLAB)") \
2024 \
2025 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
2026 "Enable LowMemoryProtection")) \
2027 \
2028 product_pd(bool, NeverActAsServerClassMachine, \
2029 "Never act like a server-class machine") \
2030 \
2031 product(bool, AlwaysActAsServerClassMachine, false, \
2032 "Always act like a server-class machine") \
2033 \
2034 product_pd(uint64_t, MaxRAM, \
2035 "Real memory size (in bytes) used to set maximum heap size") \
2036 \
2037 product(uintx, ErgoHeapSizeLimit, 0, \
2038 "Maximum ergonomically set heap size (in bytes); zero means use " \
2039 "MaxRAM / MaxRAMFraction") \
2040 \
2041 product(uintx, MaxRAMFraction, 4, \
2042 "Maximum fraction (1/n) of real memory used for maximum heap " \
2043 "size") \
2044 \
2045 product(uintx, DefaultMaxRAMFraction, 4, \
2046 "Maximum fraction (1/n) of real memory used for maximum heap " \
2047 "size; deprecated: to be renamed to MaxRAMFraction") \
2048 \
2049 product(uintx, MinRAMFraction, 2, \
2050 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
2051 "size on systems with small physical memory size") \
2052 \
2053 product(uintx, InitialRAMFraction, 64, \
2054 "Fraction (1/n) of real memory used for initial heap size") \
2055 \
2056 develop(uintx, MaxVirtMemFraction, 2, \
2057 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2058 "determining maximum heap size") \
2059 \
2060 product(bool, UseAutoGCSelectPolicy, false, \
2061 "Use automatic collection selection policy") \
2062 \
2063 product(uintx, AutoGCSelectPauseMillis, 5000, \
2064 "Automatic GC selection pause threshold in milliseconds") \
2065 \
2066 product(bool, UseAdaptiveSizePolicy, true, \
2067 "Use adaptive generation sizing policies") \
2068 \
2069 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2070 "Use adaptive survivor sizing policies") \
2071 \
2072 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2073 "Use adaptive young-old sizing policies at minor collections") \
2074 \
2075 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2076 "Use adaptive young-old sizing policies at major collections") \
2077 \
2078 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2079 "Include statistics from System.gc() for adaptive size policy") \
2080 \
2081 product(bool, UseAdaptiveGCBoundary, false, \
2082 "Allow young-old boundary to move") \
2083 \
2084 develop(bool, TraceAdaptiveGCBoundary, false, \
2085 "Trace young-old boundary moves") \
2086 \
2087 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2088 "Resize the virtual spaces of the young or old generations") \
2089 \
2090 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2091 "Policy for changing generation size for throughput goals") \
2092 \
2093 product(uintx, AdaptiveSizePausePolicy, 0, \
2094 "Policy for changing generation size for pause goals") \
2095 \
2096 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2097 "Adjust tenured generation to achieve a minor pause goal") \
2098 \
2099 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2100 "Adjust young generation to achieve a major pause goal") \
2101 \
2102 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2103 "Number of steps where heuristics is used before data is used") \
2104 \
2105 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2106 "Number of collections before the adaptive sizing is started") \
2107 \
2108 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2109 "Collection interval for printing information; zero means never") \
2110 \
2111 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2112 "Use adaptive minimum footprint as a goal") \
2113 \
2114 product(uintx, AdaptiveSizePolicyWeight, 10, \
2115 "Weight given to exponential resizing, between 0 and 100") \
2116 \
2117 product(uintx, AdaptiveTimeWeight, 25, \
2118 "Weight given to time in adaptive policy, between 0 and 100") \
2119 \
2120 product(uintx, PausePadding, 1, \
2121 "How much buffer to keep for pause time") \
2122 \
2123 product(uintx, PromotedPadding, 3, \
2124 "How much buffer to keep for promotion failure") \
2125 \
2126 product(uintx, SurvivorPadding, 3, \
2127 "How much buffer to keep for survivor overflow") \
2128 \
2129 product(uintx, ThresholdTolerance, 10, \
2130 "Allowed collection cost difference between generations") \
2131 \
2132 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2133 "If collection costs are within margin, reduce both by full " \
2134 "delta") \
2135 \
2136 product(uintx, YoungGenerationSizeIncrement, 20, \
2137 "Adaptive size percentage change in young generation") \
2138 \
2139 product(uintx, YoungGenerationSizeSupplement, 80, \
2140 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2141 \
2142 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2143 "Decay factor to YoungedGenerationSizeSupplement") \
2144 \
2145 product(uintx, TenuredGenerationSizeIncrement, 20, \
2146 "Adaptive size percentage change in tenured generation") \
2147 \
2148 product(uintx, TenuredGenerationSizeSupplement, 80, \
2149 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2150 \
2151 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2152 "Decay factor to TenuredGenerationSizeIncrement") \
2153 \
2154 product(uintx, MaxGCPauseMillis, max_uintx, \
2155 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2156 "or (G1 Only) the maximum GC time per MMU time slice") \
2157 \
2158 product(uintx, GCPauseIntervalMillis, 0, \
2159 "Time slice for MMU specification") \
2160 \
2161 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2162 "Adaptive size policy maximum GC minor pause time goal " \
2163 "in millisecond") \
2164 \
2165 product(uintx, GCTimeRatio, 99, \
2166 "Adaptive size policy application time to GC time ratio") \
2167 \
2168 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2169 "Adaptive size scale down factor for shrinking") \
2170 \
2171 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2172 "Adaptive size decays the major cost for long major intervals") \
2173 \
2174 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2175 "Time scale over which major costs decay") \
2176 \
2177 product(uintx, MinSurvivorRatio, 3, \
2178 "Minimum ratio of young generation/survivor space size") \
2179 \
2180 product(uintx, InitialSurvivorRatio, 8, \
2181 "Initial ratio of young generation/survivor space size") \
2182 \
2183 product(uintx, BaseFootPrintEstimate, 256*M, \
2184 "Estimate of footprint other than Java Heap") \
2185 \
2186 product(bool, UseGCOverheadLimit, true, \
2187 "Use policy to limit of proportion of time spent in GC " \
2188 "before an OutOfMemory error is thrown") \
2189 \
2190 product(uintx, GCTimeLimit, 98, \
2191 "Limit of the proportion of time spent in GC before " \
2192 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2193 \
2194 product(uintx, GCHeapFreeLimit, 2, \
2195 "Minimum percentage of free space after a full GC before an " \
2196 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2197 \
2198 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2199 "Number of consecutive collections before gc time limit fires") \
2200 \
2201 product(bool, PrintAdaptiveSizePolicy, false, \
2202 "Print information about AdaptiveSizePolicy") \
2203 \
2204 product(intx, PrefetchCopyIntervalInBytes, -1, \
2205 "How far ahead to prefetch destination area (<= 0 means off)") \
2206 \
2207 product(intx, PrefetchScanIntervalInBytes, -1, \
2208 "How far ahead to prefetch scan area (<= 0 means off)") \
2209 \
2210 product(intx, PrefetchFieldsAhead, -1, \
2211 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2212 \
2213 diagnostic(bool, VerifySilently, false, \
2214 "Do not print the verification progress") \
2215 \
2216 diagnostic(bool, VerifyDuringStartup, false, \
2217 "Verify memory system before executing any Java code " \
2218 "during VM initialization") \
2219 \
2220 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2221 "Verify system before exiting") \
2222 \
2223 diagnostic(bool, VerifyBeforeGC, false, \
2224 "Verify memory system before GC") \
2225 \
2226 diagnostic(bool, VerifyAfterGC, false, \
2227 "Verify memory system after GC") \
2228 \
2229 diagnostic(bool, VerifyDuringGC, false, \
2230 "Verify memory system during GC (between phases)") \
2231 \
2232 diagnostic(bool, GCParallelVerificationEnabled, true, \
2233 "Enable parallel memory system verification") \
2234 \
2235 diagnostic(bool, DeferInitialCardMark, false, \
2236 "When +ReduceInitialCardMarks, explicitly defer any that " \
2237 "may arise from new_pre_store_barrier") \
2238 \
2239 diagnostic(bool, VerifyRememberedSets, false, \
2240 "Verify GC remembered sets") \
2241 \
2242 diagnostic(bool, VerifyObjectStartArray, true, \
2243 "Verify GC object start array if verify before/after") \
2244 \
2245 product(bool, DisableExplicitGC, false, \
2246 "Ignore calls to System.gc()") \
2247 \
2248 notproduct(bool, CheckMemoryInitialization, false, \
2249 "Check memory initialization") \
2250 \
2251 product(bool, CollectGen0First, false, \
2252 "Collect youngest generation before each full GC") \
2253 \
2254 diagnostic(bool, BindCMSThreadToCPU, false, \
2255 "Bind CMS Thread to CPU if possible") \
2256 \
2257 diagnostic(uintx, CPUForCMSThread, 0, \
2258 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2259 \
2260 product(bool, BindGCTaskThreadsToCPUs, false, \
2261 "Bind GCTaskThreads to CPUs if possible") \
2262 \
2263 product(bool, UseGCTaskAffinity, false, \
2264 "Use worker affinity when asking for GCTasks") \
2265 \
2266 product(uintx, ProcessDistributionStride, 4, \
2267 "Stride through processors when distributing processes") \
2268 \
2269 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2270 "Number of times the coordinator GC thread will sleep while " \
2271 "yielding before giving up and resuming GC") \
2272 \
2273 product(uintx, CMSYieldSleepCount, 0, \
2274 "Number of times a GC thread (minus the coordinator) " \
2275 "will sleep while yielding before giving up and resuming GC") \
2276 \
2277 /* gc tracing */ \
2278 manageable(bool, PrintGC, false, \
2279 "Print message at garbage collection") \
2280 \
2281 manageable(bool, PrintGCDetails, false, \
2282 "Print more details at garbage collection") \
2283 \
2284 manageable(bool, PrintGCDateStamps, false, \
2285 "Print date stamps at garbage collection") \
2286 \
2287 manageable(bool, PrintGCTimeStamps, false, \
2288 "Print timestamps at garbage collection") \
2289 \
2290 product(bool, PrintGCTaskTimeStamps, false, \
2291 "Print timestamps for individual gc worker thread tasks") \
2292 \
2293 develop(intx, ConcGCYieldTimeout, 0, \
2294 "If non-zero, assert that GC threads yield within this " \
2295 "number of milliseconds") \
2296 \
2297 notproduct(bool, TraceMarkSweep, false, \
2298 "Trace mark sweep") \
2299 \
2300 product(bool, PrintReferenceGC, false, \
2301 "Print times spent handling reference objects during GC " \
2302 "(enabled only when PrintGCDetails)") \
2303 \
2304 develop(bool, TraceReferenceGC, false, \
2305 "Trace handling of soft/weak/final/phantom references") \
2306 \
2307 develop(bool, TraceFinalizerRegistration, false, \
2308 "Trace registration of final references") \
2309 \
2310 notproduct(bool, TraceScavenge, false, \
2311 "Trace scavenge") \
2312 \
2313 product_rw(bool, TraceClassLoading, false, \
2314 "Trace all classes loaded") \
2315 \
2316 product(bool, TraceClassLoadingPreorder, false, \
2317 "Trace all classes loaded in order referenced (not loaded)") \
2318 \
2319 product_rw(bool, TraceClassUnloading, false, \
2320 "Trace unloading of classes") \
2321 \
2322 product_rw(bool, TraceLoaderConstraints, false, \
2323 "Trace loader constraints") \
2324 \
2325 develop(bool, TraceClassLoaderData, false, \
2326 "Trace class loader loader_data lifetime") \
2327 \
2328 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2329 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2330 "Initial size of the boot class loader data metaspace") \
2331 \
2332 product(bool, TraceGen0Time, false, \
2333 "Trace accumulated time for Gen 0 collection") \
2334 \
2335 product(bool, TraceGen1Time, false, \
2336 "Trace accumulated time for Gen 1 collection") \
2337 \
2338 product(bool, PrintTenuringDistribution, false, \
2339 "Print tenuring age information") \
2340 \
2341 product_rw(bool, PrintHeapAtGC, false, \
2342 "Print heap layout before and after each GC") \
2343 \
2344 product_rw(bool, PrintHeapAtGCExtended, false, \
2345 "Print extended information about the layout of the heap " \
2346 "when -XX:+PrintHeapAtGC is set") \
2347 \
2348 product(bool, PrintHeapAtSIGBREAK, true, \
2349 "Print heap layout in response to SIGBREAK") \
2350 \
2351 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2352 "Print a class histogram before any major stop-world GC") \
2353 \
2354 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2355 "Print a class histogram after any major stop-world GC") \
2356 \
2357 manageable(bool, PrintClassHistogram, false, \
2358 "Print a histogram of class instances") \
2359 \
2360 develop(bool, TraceWorkGang, false, \
2361 "Trace activities of work gangs") \
2362 \
2363 product(bool, TraceParallelOldGCTasks, false, \
2364 "Trace multithreaded GC activity") \
2365 \
2366 develop(bool, TraceBlockOffsetTable, false, \
2367 "Print BlockOffsetTable maps") \
2368 \
2369 develop(bool, TraceCardTableModRefBS, false, \
2370 "Print CardTableModRefBS maps") \
2371 \
2372 develop(bool, TraceGCTaskManager, false, \
2373 "Trace actions of the GC task manager") \
2374 \
2375 develop(bool, TraceGCTaskQueue, false, \
2376 "Trace actions of the GC task queues") \
2377 \
2378 diagnostic(bool, TraceGCTaskThread, false, \
2379 "Trace actions of the GC task threads") \
2380 \
2381 product(bool, PrintParallelOldGCPhaseTimes, false, \
2382 "Print the time taken by each phase in ParallelOldGC " \
2383 "(PrintGCDetails must also be enabled)") \
2384 \
2385 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2386 "Trace marking phase in ParallelOldGC") \
2387 \
2388 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2389 "Trace summary phase in ParallelOldGC") \
2390 \
2391 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2392 "Trace compaction phase in ParallelOldGC") \
2393 \
2394 develop(bool, TraceParallelOldGCDensePrefix, false, \
2395 "Trace dense prefix computation for ParallelOldGC") \
2396 \
2397 develop(bool, IgnoreLibthreadGPFault, false, \
2398 "Suppress workaround for libthread GP fault") \
2399 \
2400 product(bool, PrintJNIGCStalls, false, \
2401 "Print diagnostic message when GC is stalled " \
2402 "by JNI critical section") \
2403 \
2404 experimental(double, ObjectCountCutOffPercent, 0.5, \
2405 "The percentage of the used heap that the instances of a class " \
2406 "must occupy for the class to generate a trace event") \
2407 \
2408 /* GC log rotation setting */ \
2409 \
2410 product(bool, UseGCLogFileRotation, false, \
2411 "Rotate gclog files (for long running applications). It requires "\
2412 "-Xloggc:<filename>") \
2413 \
2414 product(uintx, NumberOfGCLogFiles, 0, \
2415 "Number of gclog files in rotation " \
2416 "(default: 0, no rotation)") \
2417 \
2418 product(uintx, GCLogFileSize, 8*K, \
2419 "GC log file size, requires UseGCLogFileRotation. " \
2420 "Set to 0 to only trigger rotation via jcmd") \
2421 \
2422 /* JVMTI heap profiling */ \
2423 \
2424 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2425 "Trace JVMTI object tagging calls") \
2426 \
2427 diagnostic(bool, VerifyBeforeIteration, false, \
2428 "Verify memory system before JVMTI iteration") \
2429 \
2430 /* compiler interface */ \
2431 \
2432 develop(bool, CIPrintCompilerName, false, \
2433 "when CIPrint is active, print the name of the active compiler") \
2434 \
2435 develop(bool, CIPrintCompileQueue, false, \
2436 "display the contents of the compile queue whenever a " \
2437 "compilation is enqueued") \
2438 \
2439 develop(bool, CIPrintRequests, false, \
2440 "display every request for compilation") \
2441 \
2442 product(bool, CITime, false, \
2443 "collect timing information for compilation") \
2444 \
2445 develop(bool, CITimeEach, false, \
2446 "display timing information after each successful compilation") \
2447 \
2448 develop(bool, CICountOSR, false, \
2449 "use a separate counter when assigning ids to osr compilations") \
2450 \
2451 develop(bool, CICompileNatives, true, \
2452 "compile native methods if supported by the compiler") \
2453 \
2454 develop_pd(bool, CICompileOSR, \
2455 "compile on stack replacement methods if supported by the " \
2456 "compiler") \
2457 \
2458 develop(bool, CIPrintMethodCodes, false, \
2459 "print method bytecodes of the compiled code") \
2460 \
2461 develop(bool, CIPrintTypeFlow, false, \
2462 "print the results of ciTypeFlow analysis") \
2463 \
2464 develop(bool, CITraceTypeFlow, false, \
2465 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2466 \
2467 develop(intx, OSROnlyBCI, -1, \
2468 "OSR only at this bci. Negative values mean exclude that bci") \
2469 \
2470 /* compiler */ \
2471 \
2472 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2473 "Number of compiler threads to run") \
2474 \
2475 product(intx, CompilationPolicyChoice, 0, \
2476 "which compilation policy (0/1)") \
2477 \
2478 develop(bool, UseStackBanging, true, \
2479 "use stack banging for stack overflow checks (required for " \
2480 "proper StackOverflow handling; disable only to measure cost " \
2481 "of stackbanging)") \
2482 \
2483 develop(bool, UseStrictFP, true, \
2484 "use strict fp if modifier strictfp is set") \
2485 \
2486 develop(bool, GenerateSynchronizationCode, true, \
2487 "generate locking/unlocking code for synchronized methods and " \
2488 "monitors") \
2489 \
2490 develop(bool, GenerateCompilerNullChecks, true, \
2491 "Generate explicit null checks for loads/stores/calls") \
2492 \
2493 develop(bool, GenerateRangeChecks, true, \
2494 "Generate range checks for array accesses") \
2495 \
2496 develop_pd(bool, ImplicitNullChecks, \
2497 "Generate code for implicit null checks") \
2498 \
2499 product_pd(bool, TrapBasedNullChecks, \
2500 "Generate code for null checks that uses a cmp and trap " \
2501 "instruction raising SIGTRAP. This is only used if an access to" \
2502 "null (+offset) will not raise a SIGSEGV, i.e.," \
2503 "ImplicitNullChecks don't work (PPC64).") \
2504 \
2505 product(bool, PrintSafepointStatistics, false, \
2506 "Print statistics about safepoint synchronization") \
2507 \
2508 product(intx, PrintSafepointStatisticsCount, 300, \
2509 "Total number of safepoint statistics collected " \
2510 "before printing them out") \
2511 \
2512 product(intx, PrintSafepointStatisticsTimeout, -1, \
2513 "Print safepoint statistics only when safepoint takes " \
2514 "more than PrintSafepointSatisticsTimeout in millis") \
2515 \
2516 product(bool, TraceSafepointCleanupTime, false, \
2517 "Print the break down of clean up tasks performed during " \
2518 "safepoint") \
2519 \
2520 product(bool, Inline, true, \
2521 "Enable inlining") \
2522 \
2523 product(bool, ClipInlining, true, \
2524 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2525 \
2526 develop(bool, UseCHA, true, \
2527 "Enable CHA") \
2528 \
2529 product(bool, UseTypeProfile, true, \
2530 "Check interpreter profile for historically monomorphic calls") \
2531 \
2532 notproduct(bool, TimeCompiler, false, \
2533 "Time the compiler") \
2534 \
2535 diagnostic(bool, PrintInlining, false, \
2536 "Print inlining optimizations") \
2537 \
2538 product(bool, UsePopCountInstruction, false, \
2539 "Use population count instruction") \
2540 \
2541 develop(bool, EagerInitialization, false, \
2542 "Eagerly initialize classes if possible") \
2543 \
2544 develop(bool, TraceMethodReplacement, false, \
2545 "Print when methods are replaced do to recompilation") \
2546 \
2547 develop(bool, PrintMethodFlushing, false, \
2548 "Print the nmethods being flushed") \
2549 \
2550 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2551 "print statistics about method flushing") \
2552 \
2553 develop(bool, UseRelocIndex, false, \
2554 "Use an index to speed random access to relocations") \
2555 \
2556 develop(bool, StressCodeBuffers, false, \
2557 "Exercise code buffer expansion and other rare state changes") \
2558 \
2559 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2560 "Generate extra debugging information for non-safepoints in " \
2561 "nmethods") \
2562 \
2563 product(bool, PrintVMOptions, false, \
2564 "Print flags that appeared on the command line") \
2565 \
2566 product(bool, IgnoreUnrecognizedVMOptions, false, \
2567 "Ignore unrecognized VM options") \
2568 \
2569 product(bool, PrintCommandLineFlags, false, \
2570 "Print flags specified on command line or set by ergonomics") \
2571 \
2572 product(bool, PrintFlagsInitial, false, \
2573 "Print all VM flags before argument processing and exit VM") \
2574 \
2575 product(bool, PrintFlagsFinal, false, \
2576 "Print all VM flags after argument and ergonomic processing") \
2577 \
2578 notproduct(bool, PrintFlagsWithComments, false, \
2579 "Print all VM flags with default values and descriptions and " \
2580 "exit") \
2581 \
2582 diagnostic(bool, SerializeVMOutput, true, \
2583 "Use a mutex to serialize output to tty and LogFile") \
2584 \
2585 diagnostic(bool, DisplayVMOutput, true, \
2586 "Display all VM output on the tty, independently of LogVMOutput") \
2587 \
2588 diagnostic(bool, LogVMOutput, false, \
2589 "Save VM output to LogFile") \
2590 \
2591 diagnostic(ccstr, LogFile, NULL, \
2592 "If LogVMOutput or LogCompilation is on, save VM output to " \
2593 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2594 \
2595 product(ccstr, ErrorFile, NULL, \
2596 "If an error occurs, save the error data to this file " \
2597 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2598 \
2599 product(bool, DisplayVMOutputToStderr, false, \
2600 "If DisplayVMOutput is true, display all VM output to stderr") \
2601 \
2602 product(bool, DisplayVMOutputToStdout, false, \
2603 "If DisplayVMOutput is true, display all VM output to stdout") \
2604 \
2605 product(bool, UseHeavyMonitors, false, \
2606 "use heavyweight instead of lightweight Java monitors") \
2607 \
2608 product(bool, PrintStringTableStatistics, false, \
2609 "print statistics about the StringTable and SymbolTable") \
2610 \
2611 diagnostic(bool, VerifyStringTableAtExit, false, \
2612 "verify StringTable contents at exit") \
2613 \
2614 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2615 "print histogram of the symbol table") \
2616 \
2617 notproduct(bool, ExitVMOnVerifyError, false, \
2618 "standard exit from VM if bytecode verify error " \
2619 "(only in debug mode)") \
2620 \
2621 notproduct(ccstr, AbortVMOnException, NULL, \
2622 "Call fatal if this exception is thrown. Example: " \
2623 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2624 \
2625 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2626 "Call fatal if the exception pointed by AbortVMOnException " \
2627 "has this message") \
2628 \
2629 develop(bool, DebugVtables, false, \
2630 "add debugging code to vtable dispatch") \
2631 \
2632 develop(bool, PrintVtables, false, \
2633 "print vtables when printing klass") \
2634 \
2635 notproduct(bool, PrintVtableStats, false, \
2636 "print vtables stats at end of run") \
2637 \
2638 develop(bool, TraceCreateZombies, false, \
2639 "trace creation of zombie nmethods") \
2640 \
2641 notproduct(bool, IgnoreLockingAssertions, false, \
2642 "disable locking assertions (for speed)") \
2643 \
2644 product(bool, RangeCheckElimination, true, \
2645 "Eliminate range checks") \
2646 \
2647 develop_pd(bool, UncommonNullCast, \
2648 "track occurrences of null in casts; adjust compiler tactics") \
2649 \
2650 develop(bool, TypeProfileCasts, true, \
2651 "treat casts like calls for purposes of type profiling") \
2652 \
2653 develop(bool, DelayCompilationDuringStartup, true, \
2654 "Delay invoking the compiler until main application class is " \
2655 "loaded") \
2656 \
2657 develop(bool, CompileTheWorld, false, \
2658 "Compile all methods in all classes in bootstrap class path " \
2659 "(stress test)") \
2660 \
2661 develop(bool, CompileTheWorldPreloadClasses, true, \
2662 "Preload all classes used by a class before start loading") \
2663 \
2664 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2665 "Force a safepoint every n compiles so sweeper can keep up") \
2666 \
2667 develop(bool, FillDelaySlots, true, \
2668 "Fill delay slots (on SPARC only)") \
2669 \
2670 develop(bool, TimeLivenessAnalysis, false, \
2671 "Time computation of bytecode liveness analysis") \
2672 \
2673 develop(bool, TraceLivenessGen, false, \
2674 "Trace the generation of liveness analysis information") \
2675 \
2676 notproduct(bool, TraceLivenessQuery, false, \
2677 "Trace queries of liveness analysis information") \
2678 \
2679 notproduct(bool, CollectIndexSetStatistics, false, \
2680 "Collect information about IndexSets") \
2681 \
2682 develop(bool, UseLoopSafepoints, true, \
2683 "Generate Safepoint nodes in every loop") \
2684 \
2685 develop(intx, FastAllocateSizeLimit, 128*K, \
2686 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2687 "Inline allocations larger than this in doublewords must go slow")\
2688 \
2689 product(bool, AggressiveOpts, false, \
2690 "Enable aggressive optimizations - see arguments.cpp") \
2691 \
2692 product_pd(uintx, TypeProfileLevel, \
2693 "=XYZ, with Z: Type profiling of arguments at call; " \
2694 "Y: Type profiling of return value at call; " \
2695 "X: Type profiling of parameters to methods; " \
2696 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2697 \
2698 product(intx, TypeProfileArgsLimit, 2, \
2699 "max number of call arguments to consider for type profiling") \
2700 \
2701 product(intx, TypeProfileParmsLimit, 2, \
2702 "max number of incoming parameters to consider for type profiling"\
2703 ", -1 for all") \
2704 \
2705 /* statistics */ \
2706 develop(bool, CountCompiledCalls, false, \
2707 "Count method invocations") \
2708 \
2709 notproduct(bool, CountRuntimeCalls, false, \
2710 "Count VM runtime calls") \
2711 \
2712 develop(bool, CountJNICalls, false, \
2713 "Count jni method invocations") \
2714 \
2715 notproduct(bool, CountJVMCalls, false, \
2716 "Count jvm method invocations") \
2717 \
2718 notproduct(bool, CountRemovableExceptions, false, \
2719 "Count exceptions that could be replaced by branches due to " \
2720 "inlining") \
2721 \
2722 notproduct(bool, ICMissHistogram, false, \
2723 "Produce histogram of IC misses") \
2724 \
2725 notproduct(bool, PrintClassStatistics, false, \
2726 "Print class statistics at end of run") \
2727 \
2728 notproduct(bool, PrintMethodStatistics, false, \
2729 "Print method statistics at end of run") \
2730 \
2731 /* interpreter */ \
2732 develop(bool, ClearInterpreterLocals, false, \
2733 "Always clear local variables of interpreter activations upon " \
2734 "entry") \
2735 \
2736 product_pd(bool, RewriteBytecodes, \
2737 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2738 \
2739 product_pd(bool, RewriteFrequentPairs, \
2740 "Rewrite frequently used bytecode pairs into a single bytecode") \
2741 \
2742 diagnostic(bool, PrintInterpreter, false, \
2743 "Print the generated interpreter code") \
2744 \
2745 product(bool, UseInterpreter, true, \
2746 "Use interpreter for non-compiled methods") \
2747 \
2748 develop(bool, UseFastSignatureHandlers, true, \
2749 "Use fast signature handlers for native calls") \
2750 \
2751 product(bool, UseLoopCounter, true, \
2752 "Increment invocation counter on backward branch") \
2753 \
2754 product(bool, UseFastEmptyMethods, true, \
2755 "Use fast method entry code for empty methods") \
2756 \
2757 product(bool, UseFastAccessorMethods, true, \
2758 "Use fast method entry code for accessor methods") \
2759 \
2760 product_pd(bool, UseOnStackReplacement, \
2761 "Use on stack replacement, calls runtime if invoc. counter " \
2762 "overflows in loop") \
2763 \
2764 notproduct(bool, TraceOnStackReplacement, false, \
2765 "Trace on stack replacement") \
2766 \
2767 product_pd(bool, PreferInterpreterNativeStubs, \
2768 "Use always interpreter stubs for native methods invoked via " \
2769 "interpreter") \
2770 \
2771 develop(bool, CountBytecodes, false, \
2772 "Count number of bytecodes executed") \
2773 \
2774 develop(bool, PrintBytecodeHistogram, false, \
2775 "Print histogram of the executed bytecodes") \
2776 \
2777 develop(bool, PrintBytecodePairHistogram, false, \
2778 "Print histogram of the executed bytecode pairs") \
2779 \
2780 diagnostic(bool, PrintSignatureHandlers, false, \
2781 "Print code generated for native method signature handlers") \
2782 \
2783 develop(bool, VerifyOops, false, \
2784 "Do plausibility checks for oops") \
2785 \
2786 develop(bool, CheckUnhandledOops, false, \
2787 "Check for unhandled oops in VM code") \
2788 \
2789 develop(bool, VerifyJNIFields, trueInDebug, \
2790 "Verify jfieldIDs for instance fields") \
2791 \
2792 notproduct(bool, VerifyJNIEnvThread, false, \
2793 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2794 "from JNI") \
2795 \
2796 develop(bool, VerifyFPU, false, \
2797 "Verify FPU state (check for NaN's, etc.)") \
2798 \
2799 develop(bool, VerifyThread, false, \
2800 "Watch the thread register for corruption (SPARC only)") \
2801 \
2802 develop(bool, VerifyActivationFrameSize, false, \
2803 "Verify that activation frame didn't become smaller than its " \
2804 "minimal size") \
2805 \
2806 develop(bool, TraceFrequencyInlining, false, \
2807 "Trace frequency based inlining") \
2808 \
2809 develop_pd(bool, InlineIntrinsics, \
2810 "Inline intrinsics that can be statically resolved") \
2811 \
2812 product_pd(bool, ProfileInterpreter, \
2813 "Profile at the bytecode level during interpretation") \
2814 \
2815 develop(bool, TraceProfileInterpreter, false, \
2816 "Trace profiling at the bytecode level during interpretation. " \
2817 "This outputs the profiling information collected to improve " \
2818 "jit compilation.") \
2819 \
2820 develop_pd(bool, ProfileTraps, \
2821 "Profile deoptimization traps at the bytecode level") \
2822 \
2823 product(intx, ProfileMaturityPercentage, 20, \
2824 "number of method invocations/branches (expressed as % of " \
2825 "CompileThreshold) before using the method's profile") \
2826 \
2827 develop(bool, PrintMethodData, false, \
2828 "Print the results of +ProfileInterpreter at end of run") \
2829 \
2830 develop(bool, VerifyDataPointer, trueInDebug, \
2831 "Verify the method data pointer during interpreter profiling") \
2832 \
2833 develop(bool, VerifyCompiledCode, false, \
2834 "Include miscellaneous runtime verifications in nmethod code; " \
2835 "default off because it disturbs nmethod size heuristics") \
2836 \
2837 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2838 "Manually make GC thread crash then dump java stack trace; " \
2839 "Test only") \
2840 \
2841 /* compilation */ \
2842 product(bool, UseCompiler, true, \
2843 "Use Just-In-Time compilation") \
2844 \
2845 develop(bool, TraceCompilationPolicy, false, \
2846 "Trace compilation policy") \
2847 \
2848 develop(bool, TimeCompilationPolicy, false, \
2849 "Time the compilation policy") \
2850 \
2851 product(bool, UseCounterDecay, true, \
2852 "Adjust recompilation counters") \
2853 \
2854 develop(intx, CounterHalfLifeTime, 30, \
2855 "Half-life time of invocation counters (in seconds)") \
2856 \
2857 develop(intx, CounterDecayMinIntervalLength, 500, \
2858 "The minimum interval (in milliseconds) between invocation of " \
2859 "CounterDecay") \
2860 \
2861 product(bool, AlwaysCompileLoopMethods, false, \
2862 "When using recompilation, never interpret methods " \
2863 "containing loops") \
2864 \
2865 product(bool, DontCompileHugeMethods, true, \
2866 "Do not compile methods > HugeMethodLimit") \
2867 \
2868 /* Bytecode escape analysis estimation. */ \
2869 product(bool, EstimateArgEscape, true, \
2870 "Analyze bytecodes to estimate escape state of arguments") \
2871 \
2872 product(intx, BCEATraceLevel, 0, \
2873 "How much tracing to do of bytecode escape analysis estimates") \
2874 \
2875 product(intx, MaxBCEAEstimateLevel, 5, \
2876 "Maximum number of nested calls that are analyzed by BC EA") \
2877 \
2878 product(intx, MaxBCEAEstimateSize, 150, \
2879 "Maximum bytecode size of a method to be analyzed by BC EA") \
2880 \
2881 product(intx, AllocatePrefetchStyle, 1, \
2882 "0 = no prefetch, " \
2883 "1 = prefetch instructions for each allocation, " \
2884 "2 = use TLAB watermark to gate allocation prefetch, " \
2885 "3 = use BIS instruction on Sparc for allocation prefetch") \
2886 \
2887 product(intx, AllocatePrefetchDistance, -1, \
2888 "Distance to prefetch ahead of allocation pointer") \
2889 \
2890 product(intx, AllocatePrefetchLines, 3, \
2891 "Number of lines to prefetch ahead of array allocation pointer") \
2892 \
2893 product(intx, AllocateInstancePrefetchLines, 1, \
2894 "Number of lines to prefetch ahead of instance allocation " \
2895 "pointer") \
2896 \
2897 product(intx, AllocatePrefetchStepSize, 16, \
2898 "Step size in bytes of sequential prefetch instructions") \
2899 \
2900 product(intx, AllocatePrefetchInstr, 0, \
2901 "Prefetch instruction to prefetch ahead of allocation pointer") \
2902 \
2903 /* deoptimization */ \
2904 develop(bool, TraceDeoptimization, false, \
2905 "Trace deoptimization") \
2906 \
2907 develop(bool, DebugDeoptimization, false, \
2908 "Tracing various information while debugging deoptimization") \
2909 \
2910 product(intx, SelfDestructTimer, 0, \
2911 "Will cause VM to terminate after a given time (in minutes) " \
2912 "(0 means off)") \
2913 \
2914 product(intx, MaxJavaStackTraceDepth, 1024, \
2915 "The maximum number of lines in the stack trace for Java " \
2916 "exceptions (0 means all)") \
2917 \
2918 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2919 "Guarantee a safepoint (at least) every so many milliseconds " \
2920 "(0 means none)")) \
2921 \
2922 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2923 "Guarantee a safepoint (at least) every so many milliseconds " \
2924 "(0 means none)")) \
2925 \
2926 product(intx, SafepointTimeoutDelay, 10000, \
2927 "Delay in milliseconds for option SafepointTimeout") \
2928 \
2929 product(intx, NmethodSweepFraction, 16, \
2930 "Number of invocations of sweeper to cover all nmethods") \
2931 \
2932 product(intx, NmethodSweepCheckInterval, 5, \
2933 "Compilers wake up every n seconds to possibly sweep nmethods") \
2934 \
2935 product(intx, NmethodSweepActivity, 10, \
2936 "Removes cold nmethods from code cache if > 0. Higher values " \
2937 "result in more aggressive sweeping") \
2938 \
2939 notproduct(bool, LogSweeper, false, \
2940 "Keep a ring buffer of sweeper activity") \
2941 \
2942 notproduct(intx, SweeperLogEntries, 1024, \
2943 "Number of records in the ring buffer of sweeper activity") \
2944 \
2945 notproduct(intx, MemProfilingInterval, 500, \
2946 "Time between each invocation of the MemProfiler") \
2947 \
2948 develop(intx, MallocCatchPtr, -1, \
2949 "Hit breakpoint when mallocing/freeing this pointer") \
2950 \
2951 notproduct(intx, AssertRepeat, 1, \
2952 "number of times to evaluate expression in assert " \
2953 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2954 \
2955 notproduct(ccstrlist, SuppressErrorAt, "", \
2956 "List of assertions (file:line) to muzzle") \
2957 \
2958 notproduct(uintx, HandleAllocationLimit, 1024, \
2959 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2960 "is used") \
2961 \
2962 develop(uintx, TotalHandleAllocationLimit, 1024, \
2963 "Threshold for total handle allocation when " \
2964 "+TraceHandleAllocation is used") \
2965 \
2966 develop(intx, StackPrintLimit, 100, \
2967 "number of stack frames to print in VM-level stack dump") \
2968 \
2969 notproduct(intx, MaxElementPrintSize, 256, \
2970 "maximum number of elements to print") \
2971 \
2972 notproduct(intx, MaxSubklassPrintSize, 4, \
2973 "maximum number of subklasses to print when printing klass") \
2974 \
2975 product(intx, MaxInlineLevel, 9, \
2976 "maximum number of nested calls that are inlined") \
2977 \
2978 product(intx, MaxRecursiveInlineLevel, 1, \
2979 "maximum number of nested recursive calls that are inlined") \
2980 \
2981 develop(intx, MaxForceInlineLevel, 100, \
2982 "maximum number of nested calls that are forced for inlining " \
2983 "(using CompilerOracle or marked w/ @ForceInline)") \
2984 \
2985 product_pd(intx, InlineSmallCode, \
2986 "Only inline already compiled methods if their code size is " \
2987 "less than this") \
2988 \
2989 product(intx, MaxInlineSize, 35, \
2990 "The maximum bytecode size of a method to be inlined") \
2991 \
2992 product_pd(intx, FreqInlineSize, \
2993 "The maximum bytecode size of a frequent method to be inlined") \
2994 \
2995 product(intx, MaxTrivialSize, 6, \
2996 "The maximum bytecode size of a trivial method to be inlined") \
2997 \
2998 product(intx, MinInliningThreshold, 250, \
2999 "The minimum invocation count a method needs to have to be " \
3000 "inlined") \
3001 \
3002 develop(intx, MethodHistogramCutoff, 100, \
3003 "The cutoff value for method invocation histogram (+CountCalls)") \
3004 \
3005 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3006 "Number of interpreted methods to show in profile") \
3007 \
3008 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3009 "Number of compiled methods to show in profile") \
3010 \
3011 develop(intx, ProfilerNumberOfStubMethods, 25, \
3012 "Number of stub methods to show in profile") \
3013 \
3014 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3015 "Number of runtime stub nodes to show in profile") \
3016 \
3017 product(intx, ProfileIntervalsTicks, 100, \
3018 "Number of ticks between printing of interval profile " \
3019 "(+ProfileIntervals)") \
3020 \
3021 notproduct(intx, ScavengeALotInterval, 1, \
3022 "Interval between which scavenge will occur with +ScavengeALot") \
3023 \
3024 notproduct(intx, FullGCALotInterval, 1, \
3025 "Interval between which full gc will occur with +FullGCALot") \
3026 \
3027 notproduct(intx, FullGCALotStart, 0, \
3028 "For which invocation to start FullGCAlot") \
3029 \
3030 notproduct(intx, FullGCALotDummies, 32*K, \
3031 "Dummy object allocated with +FullGCALot, forcing all objects " \
3032 "to move") \
3033 \
3034 develop(intx, DontYieldALotInterval, 10, \
3035 "Interval between which yields will be dropped (milliseconds)") \
3036 \
3037 develop(intx, MinSleepInterval, 1, \
3038 "Minimum sleep() interval (milliseconds) when " \
3039 "ConvertSleepToYield is off (used for Solaris)") \
3040 \
3041 develop(intx, ProfilerPCTickThreshold, 15, \
3042 "Number of ticks in a PC buckets to be a hotspot") \
3043 \
3044 notproduct(intx, DeoptimizeALotInterval, 5, \
3045 "Number of exits until DeoptimizeALot kicks in") \
3046 \
3047 notproduct(intx, ZombieALotInterval, 5, \
3048 "Number of exits until ZombieALot kicks in") \
3049 \
3050 diagnostic(intx, MallocVerifyInterval, 0, \
3051 "If non-zero, verify C heap after every N calls to " \
3052 "malloc/realloc/free") \
3053 \
3054 diagnostic(intx, MallocVerifyStart, 0, \
3055 "If non-zero, start verifying C heap after Nth call to " \
3056 "malloc/realloc/free") \
3057 \
3058 diagnostic(uintx, MallocMaxTestWords, 0, \
3059 "If non-zero, maximum number of words that malloc/realloc can " \
3060 "allocate (for testing only)") \
3061 \
3062 product(intx, TypeProfileWidth, 2, \
3063 "Number of receiver types to record in call/cast profile") \
3064 \
3065 develop(intx, BciProfileWidth, 2, \
3066 "Number of return bci's to record in ret profile") \
3067 \
3068 product(intx, PerMethodRecompilationCutoff, 400, \
3069 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3070 \
3071 product(intx, PerBytecodeRecompilationCutoff, 200, \
3072 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3073 \
3074 product(intx, PerMethodTrapLimit, 100, \
3075 "Limit on traps (of one kind) in a method (includes inlines)") \
3076 \
3077 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3078 "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3079 \
3080 product(intx, PerBytecodeTrapLimit, 4, \
3081 "Limit on traps (of one kind) at a particular BCI") \
3082 \
3083 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3084 "Extra method data trap entries for speculation") \
3085 \
3086 develop(intx, InlineFrequencyRatio, 20, \
3087 "Ratio of call site execution to caller method invocation") \
3088 \
3089 develop_pd(intx, InlineFrequencyCount, \
3090 "Count of call site execution necessary to trigger frequent " \
3091 "inlining") \
3092 \
3093 develop(intx, InlineThrowCount, 50, \
3094 "Force inlining of interpreted methods that throw this often") \
3095 \
3096 develop(intx, InlineThrowMaxSize, 200, \
3097 "Force inlining of throwing methods smaller than this") \
3098 \
3099 develop(intx, ProfilerNodeSize, 1024, \
3100 "Size in K to allocate for the Profile Nodes of each thread") \
3101 \
3102 product_pd(intx, PreInflateSpin, \
3103 "Number of times to spin wait before inflation") \
3104 \
3105 /* gc parameters */ \
3106 product(uintx, InitialHeapSize, 0, \
3107 "Initial heap size (in bytes); zero means use ergonomics") \
3108 \
3109 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3110 "Maximum heap size (in bytes)") \
3111 \
3112 product(uintx, OldSize, ScaleForWordSize(4*M), \
3113 "Initial tenured generation size (in bytes)") \
3114 \
3115 product(uintx, NewSize, ScaleForWordSize(1*M), \
3116 "Initial new generation size (in bytes)") \
3117 \
3118 product(uintx, MaxNewSize, max_uintx, \
3119 "Maximum new generation size (in bytes), max_uintx means set " \
3120 "ergonomically") \
3121 \
3122 product(uintx, PretenureSizeThreshold, 0, \
3123 "Maximum size in bytes of objects allocated in DefNew " \
3124 "generation; zero means no maximum") \
3125 \
3126 product(uintx, TLABSize, 0, \
3127 "Starting TLAB size (in bytes); zero means set ergonomically") \
3128 \
3129 product(uintx, MinTLABSize, 2*K, \
3130 "Minimum allowed TLAB size (in bytes)") \
3131 \
3132 product(uintx, TLABAllocationWeight, 35, \
3133 "Allocation averaging weight") \
3134 \
3135 product(uintx, TLABWasteTargetPercent, 1, \
3136 "Percentage of Eden that can be wasted") \
3137 \
3138 product(uintx, TLABRefillWasteFraction, 64, \
3139 "Maximum TLAB waste at a refill (internal fragmentation)") \
3140 \
3141 product(uintx, TLABWasteIncrement, 4, \
3142 "Increment allowed waste at slow allocation") \
3143 \
3144 product(uintx, SurvivorRatio, 8, \
3145 "Ratio of eden/survivor space size") \
3146 \
3147 product(uintx, NewRatio, 2, \
3148 "Ratio of old/new generation sizes") \
3149 \
3150 product_pd(uintx, NewSizeThreadIncrease, \
3151 "Additional size added to desired new generation size per " \
3152 "non-daemon thread (in bytes)") \
3153 \
3154 product_pd(uintx, MetaspaceSize, \
3155 "Initial size of Metaspaces (in bytes)") \
3156 \
3157 product(uintx, MaxMetaspaceSize, max_uintx, \
3158 "Maximum size of Metaspaces (in bytes)") \
3159 \
3160 product(uintx, CompressedClassSpaceSize, 1*G, \
3161 "Maximum size of class area in Metaspace when compressed " \
3162 "class pointers are used") \
3163 \
3164 manageable(uintx, MinHeapFreeRatio, 40, \
3165 "The minimum percentage of heap free after GC to avoid expansion."\
3166 " For most GCs this applies to the old generation. In G1 and" \
3167 " ParallelGC it applies to the whole heap.") \
3168 \
3169 manageable(uintx, MaxHeapFreeRatio, 70, \
3170 "The maximum percentage of heap free after GC to avoid shrinking."\
3171 " For most GCs this applies to the old generation. In G1 and" \
3172 " ParallelGC it applies to the whole heap.") \
3173 \
3174 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3175 "Number of milliseconds per MB of free space in the heap") \
3176 \
3177 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3178 "The minimum change in heap space due to GC (in bytes)") \
3179 \
3180 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3181 "The minimum expansion of Metaspace (in bytes)") \
3182 \
3183 product(uintx, MinMetaspaceFreeRatio, 40, \
3184 "The minimum percentage of Metaspace free after GC to avoid " \
3185 "expansion") \
3186 \
3187 product(uintx, MaxMetaspaceFreeRatio, 70, \
3188 "The maximum percentage of Metaspace free after GC to avoid " \
3189 "shrinking") \
3190 \
3191 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3192 "The maximum expansion of Metaspace without full GC (in bytes)") \
3193 \
3194 product(uintx, QueuedAllocationWarningCount, 0, \
3195 "Number of times an allocation that queues behind a GC " \
3196 "will retry before printing a warning") \
3197 \
3198 diagnostic(uintx, VerifyGCStartAt, 0, \
3199 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3200 \
3201 diagnostic(intx, VerifyGCLevel, 0, \
3202 "Generation level at which to start +VerifyBefore/AfterGC") \
3203 \
3204 product(uintx, MaxTenuringThreshold, 15, \
3205 "Maximum value for tenuring threshold") \
3206 \
3207 product(uintx, InitialTenuringThreshold, 7, \
3208 "Initial value for tenuring threshold") \
3209 \
3210 product(uintx, TargetSurvivorRatio, 50, \
3211 "Desired percentage of survivor space used after scavenge") \
3212 \
3213 product(uintx, MarkSweepDeadRatio, 5, \
3214 "Percentage (0-100) of the old gen allowed as dead wood. " \
3215 "Serial mark sweep treats this as both the minimum and maximum " \
3216 "value. " \
3217 "CMS uses this value only if it falls back to mark sweep. " \
3218 "Par compact uses a variable scale based on the density of the " \
3219 "generation and treats this as the maximum value when the heap " \
3220 "is either completely full or completely empty. Par compact " \
3221 "also has a smaller default value; see arguments.cpp.") \
3222 \
3223 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3224 "How often should we fully compact the heap (ignoring the dead " \
3225 "space parameters)") \
3226 \
3227 product(intx, PrintCMSStatistics, 0, \
3228 "Statistics for CMS") \
3229 \
3230 product(bool, PrintCMSInitiationStatistics, false, \
3231 "Statistics for initiating a CMS collection") \
3232 \
3233 product(intx, PrintFLSStatistics, 0, \
3234 "Statistics for CMS' FreeListSpace") \
3235 \
3236 product(intx, PrintFLSCensus, 0, \
3237 "Census for CMS' FreeListSpace") \
3238 \
3239 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3240 "Delay between expansion and allocation (in milliseconds)") \
3241 \
3242 develop(uintx, GCWorkerDelayMillis, 0, \
3243 "Delay in scheduling GC workers (in milliseconds)") \
3244 \
3245 product(intx, DeferThrSuspendLoopCount, 4000, \
3246 "(Unstable) Number of times to iterate in safepoint loop " \
3247 "before blocking VM threads ") \
3248 \
3249 product(intx, DeferPollingPageLoopCount, -1, \
3250 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3251 "before changing safepoint polling page to RO ") \
3252 \
3253 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3254 \
3255 product(bool, PSChunkLargeArrays, true, \
3256 "Process large arrays in chunks") \
3257 \
3258 product(uintx, GCDrainStackTargetSize, 64, \
3259 "Number of entries we will try to leave on the stack " \
3260 "during parallel gc") \
3261 \
3262 /* stack parameters */ \
3263 product_pd(intx, StackYellowPages, \
3264 "Number of yellow zone (recoverable overflows) pages") \
3265 \
3266 product_pd(intx, StackRedPages, \
3267 "Number of red zone (unrecoverable overflows) pages") \
3268 \
3269 product_pd(intx, StackShadowPages, \
3270 "Number of shadow zone (for overflow checking) pages " \
3271 "this should exceed the depth of the VM and native call stack") \
3272 \
3273 product_pd(intx, ThreadStackSize, \
3274 "Thread Stack Size (in Kbytes)") \
3275 \
3276 product_pd(intx, VMThreadStackSize, \
3277 "Non-Java Thread Stack Size (in Kbytes)") \
3278 \
3279 product_pd(intx, CompilerThreadStackSize, \
3280 "Compiler Thread Stack Size (in Kbytes)") \
3281 \
3282 develop_pd(uintx, JVMInvokeMethodSlack, \
3283 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3284 \
3285 product(uintx, ThreadSafetyMargin, 50*M, \
3286 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3287 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3288 "disable this feature") \
3289 \
3290 /* code cache parameters */ \
3291 /* ppc64 has large code-entry alignment. */ \
3292 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \
3293 "Code cache segment size (in bytes) - smallest unit of " \
3294 "allocation") \
3295 \
3296 develop_pd(intx, CodeEntryAlignment, \
3297 "Code entry alignment for generated code (in bytes)") \
3298 \
3299 product_pd(intx, OptoLoopAlignment, \
3300 "Align inner loops to zero relative to this modulus") \
3301 \
3302 product_pd(uintx, InitialCodeCacheSize, \
3303 "Initial code cache size (in bytes)") \
3304 \
3305 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3306 "Minimum code cache size (in bytes) required to start VM.") \
3307 \
3308 product_pd(uintx, ReservedCodeCacheSize, \
3309 "Reserved code cache size (in bytes) - maximum code cache size") \
3310 \
3311 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3312 "When less than X space left, we stop compiling") \
3313 \
3314 product_pd(uintx, CodeCacheExpansionSize, \
3315 "Code cache expansion size (in bytes)") \
3316 \
3317 develop_pd(uintx, CodeCacheMinBlockLength, \
3318 "Minimum number of segments in a code cache block") \
3319 \
3320 notproduct(bool, ExitOnFullCodeCache, false, \
3321 "Exit the VM if we fill the code cache") \
3322 \
3323 product(bool, UseCodeCacheFlushing, true, \
3324 "Remove cold/old nmethods from the code cache") \
3325 \
3326 /* interpreter debugging */ \
3327 develop(intx, BinarySwitchThreshold, 5, \
3328 "Minimal number of lookupswitch entries for rewriting to binary " \
3329 "switch") \
3330 \
3331 develop(intx, StopInterpreterAt, 0, \
3332 "Stop interpreter execution at specified bytecode number") \
3333 \
3334 develop(intx, TraceBytecodesAt, 0, \
3335 "Trace bytecodes starting with specified bytecode number") \
3336 \
3337 /* compiler interface */ \
3338 develop(intx, CIStart, 0, \
3339 "The id of the first compilation to permit") \
3340 \
3341 develop(intx, CIStop, max_jint, \
3342 "The id of the last compilation to permit") \
3343 \
3344 develop(intx, CIStartOSR, 0, \
3345 "The id of the first osr compilation to permit " \
3346 "(CICountOSR must be on)") \
3347 \
3348 develop(intx, CIStopOSR, max_jint, \
3349 "The id of the last osr compilation to permit " \
3350 "(CICountOSR must be on)") \
3351 \
3352 develop(intx, CIBreakAtOSR, -1, \
3353 "The id of osr compilation to break at") \
3354 \
3355 develop(intx, CIBreakAt, -1, \
3356 "The id of compilation to break at") \
3357 \
3358 product(ccstrlist, CompileOnly, "", \
3359 "List of methods (pkg/class.name) to restrict compilation to") \
3360 \
3361 product(ccstr, CompileCommandFile, NULL, \
3362 "Read compiler commands from this file [.hotspot_compiler]") \
3363 \
3364 product(ccstrlist, CompileCommand, "", \
3365 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3366 \
3367 develop(bool, ReplayCompiles, false, \
3368 "Enable replay of compilations from ReplayDataFile") \
3369 \
3370 product(ccstr, ReplayDataFile, NULL, \
3371 "File containing compilation replay information" \
3372 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3373 \
3374 product(ccstr, InlineDataFile, NULL, \
3375 "File containing inlining replay information" \
3376 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3377 \
3378 develop(intx, ReplaySuppressInitializers, 2, \
3379 "Control handling of class initialization during replay: " \
3380 "0 - don't do anything special; " \
3381 "1 - treat all class initializers as empty; " \
3382 "2 - treat class initializers for application classes as empty; " \
3383 "3 - allow all class initializers to run during bootstrap but " \
3384 " pretend they are empty after starting replay") \
3385 \
3386 develop(bool, ReplayIgnoreInitErrors, false, \
3387 "Ignore exceptions thrown during initialization for replay") \
3388 \
3389 product(bool, DumpReplayDataOnError, true, \
3390 "Record replay data for crashing compiler threads") \
3391 \
3392 product(bool, CICompilerCountPerCPU, false, \
3393 "1 compiler thread for log(N CPUs)") \
3394 \
3395 develop(intx, CIFireOOMAt, -1, \
3396 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3397 "(non-negative value throws OOM after this many CI accesses " \
3398 "in each compile)") \
3399 notproduct(intx, CICrashAt, -1, \
3400 "id of compilation to trigger assert in compiler thread for " \
3401 "the purpose of testing, e.g. generation of replay data") \
3402 notproduct(bool, CIObjectFactoryVerify, false, \
3403 "enable potentially expensive verification in ciObjectFactory") \
3404 \
3405 /* Priorities */ \
3406 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3407 \
3408 product(intx, ThreadPriorityPolicy, 0, \
3409 "0 : Normal. "\
3410 " VM chooses priorities that are appropriate for normal "\
3411 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3412 " to normal native priority. Java priorities below " \
3413 " NORM_PRIORITY map to lower native priority values. On "\
3414 " Windows applications are allowed to use higher native "\
3415 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3416 " not use the highest possible native priority, "\
3417 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3418 " system threads. On Linux thread priorities are ignored "\
3419 " because the OS does not support static priority in "\
3420 " SCHED_OTHER scheduling class which is the only choice for "\
3421 " non-root, non-realtime applications. "\
3422 "1 : Aggressive. "\
3423 " Java thread priorities map over to the entire range of "\
3424 " native thread priorities. Higher Java thread priorities map "\
3425 " to higher native thread priorities. This policy should be "\
3426 " used with care, as sometimes it can cause performance "\
3427 " degradation in the application and/or the entire system. On "\
3428 " Linux this policy requires root privilege.") \
3429 \
3430 product(bool, ThreadPriorityVerbose, false, \
3431 "Print priority changes") \
3432 \
3433 product(intx, DefaultThreadPriority, -1, \
3434 "The native priority at which threads run if not elsewhere " \
3435 "specified (-1 means no change)") \
3436 \
3437 product(intx, CompilerThreadPriority, -1, \
3438 "The native priority at which compiler threads should run " \
3439 "(-1 means no change)") \
3440 \
3441 product(intx, VMThreadPriority, -1, \
3442 "The native priority at which the VM thread should run " \
3443 "(-1 means no change)") \
3444 \
3445 product(bool, CompilerThreadHintNoPreempt, true, \
3446 "(Solaris only) Give compiler threads an extra quanta") \
3447 \
3448 product(bool, VMThreadHintNoPreempt, false, \
3449 "(Solaris only) Give VM thread an extra quanta") \
3450 \
3451 product(intx, JavaPriority1_To_OSPriority, -1, \
3452 "Map Java priorities to OS priorities") \
3453 \
3454 product(intx, JavaPriority2_To_OSPriority, -1, \
3455 "Map Java priorities to OS priorities") \
3456 \
3457 product(intx, JavaPriority3_To_OSPriority, -1, \
3458 "Map Java priorities to OS priorities") \
3459 \
3460 product(intx, JavaPriority4_To_OSPriority, -1, \
3461 "Map Java priorities to OS priorities") \
3462 \
3463 product(intx, JavaPriority5_To_OSPriority, -1, \
3464 "Map Java priorities to OS priorities") \
3465 \
3466 product(intx, JavaPriority6_To_OSPriority, -1, \
3467 "Map Java priorities to OS priorities") \
3468 \
3469 product(intx, JavaPriority7_To_OSPriority, -1, \
3470 "Map Java priorities to OS priorities") \
3471 \
3472 product(intx, JavaPriority8_To_OSPriority, -1, \
3473 "Map Java priorities to OS priorities") \
3474 \
3475 product(intx, JavaPriority9_To_OSPriority, -1, \
3476 "Map Java priorities to OS priorities") \
3477 \
3478 product(intx, JavaPriority10_To_OSPriority,-1, \
3479 "Map Java priorities to OS priorities") \
3480 \
3481 experimental(bool, UseCriticalJavaThreadPriority, false, \
3482 "Java thread priority 10 maps to critical scheduling priority") \
3483 \
3484 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3485 "Compiler thread(s) run at critical scheduling priority") \
3486 \
3487 experimental(bool, UseCriticalCMSThreadPriority, false, \
3488 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3489 \
3490 /* compiler debugging */ \
3491 notproduct(intx, CompileTheWorldStartAt, 1, \
3492 "First class to consider when using +CompileTheWorld") \
3493 \
3494 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3495 "Last class to consider when using +CompileTheWorld") \
3496 \
3497 develop(intx, NewCodeParameter, 0, \
3498 "Testing Only: Create a dedicated integer parameter before " \
3499 "putback") \
3500 \
3501 /* new oopmap storage allocation */ \
3502 develop(intx, MinOopMapAllocation, 8, \
3503 "Minimum number of OopMap entries in an OopMapSet") \
3504 \
3505 /* Background Compilation */ \
3506 develop(intx, LongCompileThreshold, 50, \
3507 "Used with +TraceLongCompiles") \
3508 \
3509 product(intx, StarvationMonitorInterval, 200, \
3510 "Pause between each check (in milliseconds)") \
3511 \
3512 /* recompilation */ \
3513 product_pd(intx, CompileThreshold, \
3514 "number of interpreted method invocations before (re-)compiling") \
3515 \
3516 product_pd(intx, BackEdgeThreshold, \
3517 "Interpreter Back edge threshold at which an OSR compilation is " \
3518 "invoked") \
3519 \
3520 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3521 "Interpreter (tier 0) invocation notification frequency") \
3522 \
3523 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3524 "C1 without MDO (tier 2) invocation notification frequency") \
3525 \
3526 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3527 "C1 with MDO profiling (tier 3) invocation notification " \
3528 "frequency") \
3529 \
3530 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3531 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3532 \
3533 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3534 "Interpreter (tier 0) invocation notification frequency") \
3535 \
3536 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3537 "C1 without MDO (tier 2) invocation notification frequency") \
3538 \
3539 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3540 "C1 with MDO profiling (tier 3) invocation notification " \
3541 "frequency") \
3542 \
3543 product(intx, Tier2CompileThreshold, 0, \
3544 "threshold at which tier 2 compilation is invoked") \
3545 \
3546 product(intx, Tier2BackEdgeThreshold, 0, \
3547 "Back edge threshold at which tier 2 compilation is invoked") \
3548 \
3549 product(intx, Tier3InvocationThreshold, 200, \
3550 "Compile if number of method invocations crosses this " \
3551 "threshold") \
3552 \
3553 product(intx, Tier3MinInvocationThreshold, 100, \
3554 "Minimum invocation to compile at tier 3") \
3555 \
3556 product(intx, Tier3CompileThreshold, 2000, \
3557 "Threshold at which tier 3 compilation is invoked (invocation " \
3558 "minimum must be satisfied") \
3559 \
3560 product(intx, Tier3BackEdgeThreshold, 60000, \
3561 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3562 \
3563 product(intx, Tier4InvocationThreshold, 5000, \
3564 "Compile if number of method invocations crosses this " \
3565 "threshold") \
3566 \
3567 product(intx, Tier4MinInvocationThreshold, 600, \
3568 "Minimum invocation to compile at tier 4") \
3569 \
3570 product(intx, Tier4CompileThreshold, 15000, \
3571 "Threshold at which tier 4 compilation is invoked (invocation " \
3572 "minimum must be satisfied") \
3573 \
3574 product(intx, Tier4BackEdgeThreshold, 40000, \
3575 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3576 \
3577 product(intx, Tier3DelayOn, 5, \
3578 "If C2 queue size grows over this amount per compiler thread " \
3579 "stop compiling at tier 3 and start compiling at tier 2") \
3580 \
3581 product(intx, Tier3DelayOff, 2, \
3582 "If C2 queue size is less than this amount per compiler thread " \
3583 "allow methods compiled at tier 2 transition to tier 3") \
3584 \
3585 product(intx, Tier3LoadFeedback, 5, \
3586 "Tier 3 thresholds will increase twofold when C1 queue size " \
3587 "reaches this amount per compiler thread") \
3588 \
3589 product(intx, Tier4LoadFeedback, 3, \
3590 "Tier 4 thresholds will increase twofold when C2 queue size " \
3591 "reaches this amount per compiler thread") \
3592 \
3593 product(intx, TieredCompileTaskTimeout, 50, \
3594 "Kill compile task if method was not used within " \
3595 "given timeout in milliseconds") \
3596 \
3597 product(intx, TieredStopAtLevel, 4, \
3598 "Stop at given compilation level") \
3599 \
3600 product(intx, Tier0ProfilingStartPercentage, 200, \
3601 "Start profiling in interpreter if the counters exceed tier 3 " \
3602 "thresholds by the specified percentage") \
3603 \
3604 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3605 "Increase the compile threshold for C1 compilation if the code " \
3606 "cache is filled by the specified percentage") \
3607 \
3608 product(intx, TieredRateUpdateMinTime, 1, \
3609 "Minimum rate sampling interval (in milliseconds)") \
3610 \
3611 product(intx, TieredRateUpdateMaxTime, 25, \
3612 "Maximum rate sampling interval (in milliseconds)") \
3613 \
3614 product_pd(bool, TieredCompilation, \
3615 "Enable tiered compilation") \
3616 \
3617 product(bool, PrintTieredEvents, false, \
3618 "Print tiered events notifications") \
3619 \
3620 product_pd(intx, OnStackReplacePercentage, \
3621 "NON_TIERED number of method invocations/branches (expressed as " \
3622 "% of CompileThreshold) before (re-)compiling OSR code") \
3623 \
3624 product(intx, InterpreterProfilePercentage, 33, \
3625 "NON_TIERED number of method invocations/branches (expressed as " \
3626 "% of CompileThreshold) before profiling in the interpreter") \
3627 \
3628 develop(intx, MaxRecompilationSearchLength, 10, \
3629 "The maximum number of frames to inspect when searching for " \
3630 "recompilee") \
3631 \
3632 develop(intx, MaxInterpretedSearchLength, 3, \
3633 "The maximum number of interpreted frames to skip when searching "\
3634 "for recompilee") \
3635 \
3636 develop(intx, DesiredMethodLimit, 8000, \
3637 "The desired maximum method size (in bytecodes) after inlining") \
3638 \
3639 develop(intx, HugeMethodLimit, 8000, \
3640 "Don't compile methods larger than this if " \
3641 "+DontCompileHugeMethods") \
3642 \
3643 /* New JDK 1.4 reflection implementation */ \
3644 \
3645 develop(bool, UseNewReflection, true, \
3646 "Temporary flag for transition to reflection based on dynamic " \
3647 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3648 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3649 "changes were needed") \
3650 \
3651 develop(bool, VerifyReflectionBytecodes, false, \
3652 "Force verification of 1.4 reflection bytecodes. Does not work " \
3653 "in situations like that described in 4486457 or for " \
3654 "constructors generated for serialization, so can not be enabled "\
3655 "in product.") \
3656 \
3657 product(bool, ReflectionWrapResolutionErrors, true, \
3658 "Temporary flag for transition to AbstractMethodError wrapped " \
3659 "in InvocationTargetException. See 6531596") \
3660 \
3661 develop(intx, FastSuperclassLimit, 8, \
3662 "Depth of hardwired instanceof accelerator array") \
3663 \
3664 /* Properties for Java libraries */ \
3665 \
3666 product(uintx, MaxDirectMemorySize, 0, \
3667 "Maximum total size of NIO direct-buffer allocations") \
3668 \
3669 /* temporary developer defined flags */ \
3670 \
3671 diagnostic(bool, UseNewCode, false, \
3672 "Testing Only: Use the new version while testing") \
3673 \
3674 diagnostic(bool, UseNewCode2, false, \
3675 "Testing Only: Use the new version while testing") \
3676 \
3677 diagnostic(bool, UseNewCode3, false, \
3678 "Testing Only: Use the new version while testing") \
3679 \
3680 /* flags for performance data collection */ \
3681 \
3682 product(bool, UsePerfData, falseInEmbedded, \
3683 "Flag to disable jvmstat instrumentation for performance testing "\
3684 "and problem isolation purposes") \
3685 \
3686 product(bool, PerfDataSaveToFile, false, \
3687 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3688 \
3689 product(ccstr, PerfDataSaveFile, NULL, \
3690 "Save PerfData memory to the specified absolute pathname. " \
3691 "The string %p in the file name (if present) " \
3692 "will be replaced by pid") \
3693 \
3694 product(intx, PerfDataSamplingInterval, 50, \
3695 "Data sampling interval (in milliseconds)") \
3696 \
3697 develop(bool, PerfTraceDataCreation, false, \
3698 "Trace creation of Performance Data Entries") \
3699 \
3700 develop(bool, PerfTraceMemOps, false, \
3701 "Trace PerfMemory create/attach/detach calls") \
3702 \
3703 product(bool, PerfDisableSharedMem, false, \
3704 "Store performance data in standard memory") \
3705 \
3706 product(intx, PerfDataMemorySize, 32*K, \
3707 "Size of performance data memory region. Will be rounded " \
3708 "up to a multiple of the native os page size.") \
3709 \
3710 product(intx, PerfMaxStringConstLength, 1024, \
3711 "Maximum PerfStringConstant string length before truncation") \
3712 \
3713 product(bool, PerfAllowAtExitRegistration, false, \
3714 "Allow registration of atexit() methods") \
3715 \
3716 product(bool, PerfBypassFileSystemCheck, false, \
3717 "Bypass Win32 file system criteria checks (Windows Only)") \
3718 \
3719 product(intx, UnguardOnExecutionViolation, 0, \
3720 "Unguard page and retry on no-execute fault (Win32 only) " \
3721 "0=off, 1=conservative, 2=aggressive") \
3722 \
3723 /* Serviceability Support */ \
3724 \
3725 product(bool, ManagementServer, false, \
3726 "Create JMX Management Server") \
3727 \
3728 product(bool, DisableAttachMechanism, false, \
3729 "Disable mechanism that allows tools to attach to this VM") \
3730 \
3731 product(bool, StartAttachListener, false, \
3732 "Always start Attach Listener at VM startup") \
3733 \
3734 manageable(bool, PrintConcurrentLocks, false, \
3735 "Print java.util.concurrent locks in thread dump") \
3736 \
3737 product(bool, TransmitErrorReport, false, \
3738 "Enable error report transmission on erroneous termination") \
3739 \
3740 product(ccstr, ErrorReportServer, NULL, \
3741 "Override built-in error report server address") \
3742 \
3743 /* Shared spaces */ \
3744 \
3745 product(bool, UseSharedSpaces, true, \
3746 "Use shared spaces for metadata") \
3747 \
3748 product(bool, RequireSharedSpaces, false, \
3749 "Require shared spaces for metadata") \
3750 \
3751 product(bool, DumpSharedSpaces, false, \
3752 "Special mode: JVM reads a class list, loads classes, builds " \
3753 "shared spaces, and dumps the shared spaces to a file to be " \
3754 "used in future JVM runs") \
3755 \
3756 product(bool, PrintSharedSpaces, false, \
3757 "Print usage of shared spaces") \
3758 \
3759 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3760 "Size of read-write space for metadata (in bytes)") \
3761 \
3762 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3763 "Size of read-only space for metadata (in bytes)") \
3764 \
3765 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3766 "Size of the shared miscellaneous data area (in bytes)") \
3767 \
3768 product(uintx, SharedMiscCodeSize, 120*K, \
3769 "Size of the shared miscellaneous code area (in bytes)") \
3770 \
3771 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3772 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3773 "Address to allocate shared memory region for class data") \
3774 \
3775 diagnostic(bool, EnableInvokeDynamic, true, \
3776 "support JSR 292 (method handles, invokedynamic, " \
3777 "anonymous classes") \
3778 \
3779 diagnostic(bool, PrintMethodHandleStubs, false, \
3780 "Print generated stub code for method handles") \
3781 \
3782 develop(bool, TraceMethodHandles, false, \
3783 "trace internal method handle operations") \
3784 \
3785 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3786 "perform extra checks when constructing method handles") \
3787 \
3788 diagnostic(bool, ShowHiddenFrames, false, \
3789 "show method handle implementation frames (usually hidden)") \
3790 \
3791 experimental(bool, TrustFinalNonStaticFields, false, \
3792 "trust final non-static declarations for constant folding") \
3793 \
3794 diagnostic(bool, FoldStableValues, true, \
3795 "Optimize loads from stable fields (marked w/ @Stable)") \
3796 \
3797 develop(bool, TraceInvokeDynamic, false, \
3798 "trace internal invoke dynamic operations") \
3799 \
3800 diagnostic(bool, PauseAtStartup, false, \
3801 "Causes the VM to pause at startup time and wait for the pause " \
3802 "file to be removed (default: ./vm.paused.<pid>)") \
3803 \
3804 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3805 "The file to create and for whose removal to await when pausing " \
3806 "at startup. (default: ./vm.paused.<pid>)") \
3807 \
3808 diagnostic(bool, PauseAtExit, false, \
3809 "Pause and wait for keypress on exit if a debugger is attached") \
3810 \
3811 product(bool, ExtendedDTraceProbes, false, \
3812 "Enable performance-impacting dtrace probes") \
3813 \
3814 product(bool, DTraceMethodProbes, false, \
3815 "Enable dtrace probes for method-entry and method-exit") \
3816 \
3817 product(bool, DTraceAllocProbes, false, \
3818 "Enable dtrace probes for object allocation") \
3819 \
3820 product(bool, DTraceMonitorProbes, false, \
3821 "Enable dtrace probes for monitor events") \
3822 \
3823 product(bool, RelaxAccessControlCheck, false, \
3824 "Relax the access control checks in the verifier") \
3825 \
3826 diagnostic(bool, PrintDTraceDOF, false, \
3827 "Print the DTrace DOF passed to the system for JSDT probes") \
3828 \
3829 product(uintx, StringTableSize, defaultStringTableSize, \
3830 "Number of buckets in the interned String table") \
3831 \
3832 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
3833 "Number of buckets in the JVM internal Symbol table") \
3834 \
3835 product(bool, UseStringDeduplication, false, \
3836 "Use string deduplication") \
3837 \
3838 product(bool, PrintStringDeduplicationStatistics, false, \
3839 "Print string deduplication statistics") \
3840 \
3841 product(uintx, StringDeduplicationAgeThreshold, 3, \
3842 "A string must reach this age (or be promoted to an old region) " \
3843 "to be considered for deduplication") \
3844 \
3845 diagnostic(bool, StringDeduplicationResizeALot, false, \
3846 "Force table resize every time the table is scanned") \
3847 \
3848 diagnostic(bool, StringDeduplicationRehashALot, false, \
3849 "Force table rehash every time the table is scanned") \
3850 \
3851 develop(bool, TraceDefaultMethods, false, \
3852 "Trace the default method processing steps") \
3853 \
3854 develop(bool, VerifyGenericSignatures, false, \
3855 "Abort VM on erroneous or inconsistent generic signatures") \
3856 \
3857 product(bool, UseVMInterruptibleIO, false, \
3858 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3859 "EINTR for I/O operations results in OS_INTRPT. The default " \
3860 "value of this flag is true for JDK 6 and earlier") \
3861 \
3862 diagnostic(bool, WhiteBoxAPI, false, \
3863 "Enable internal testing APIs") \
3864 \
3865 product(bool, PrintGCCause, true, \
3866 "Include GC cause in GC logging") \
3867 \
3868 product(bool , AllowNonVirtualCalls, false, \
3869 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3870 \
3871 diagnostic(ccstr, SharedArchiveFile, NULL, \
3872 "Override the default location of the CDS archive file") \
3873 \
3874 experimental(uintx, ArrayAllocatorMallocLimit, \
3875 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3876 "Allocation less than this value will be allocated " \
3877 "using malloc. Larger allocations will use mmap.") \
3878 \
3879 product(bool, EnableTracing, false, \
3880 "Enable event-based tracing") \
3881 \
3882 product(bool, UseLockedTracing, false, \
3883 "Use locked-tracing when doing event-based tracing")
3885 /*
3886 * Macros for factoring of globals
3887 */
3889 // Interface macros
3890 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3891 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3892 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3893 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3894 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3895 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3896 #ifdef PRODUCT
3897 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
3898 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
3899 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
3900 #else
3901 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3902 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3903 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3904 #endif
3905 // Special LP64 flags, product only needed for now.
3906 #ifdef _LP64
3907 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3908 #else
3909 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3910 #endif // _LP64
3912 // Implementation macros
3913 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3914 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3915 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3916 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3917 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3918 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3919 #ifdef PRODUCT
3920 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
3921 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
3922 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
3923 #else
3924 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3925 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3926 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3927 #endif
3928 #ifdef _LP64
3929 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3930 #else
3931 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3932 #endif // _LP64
3934 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)
3936 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3938 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3940 // Extensions
3942 #include "runtime/globals_ext.hpp"
3944 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP