Tue, 18 Mar 2014 19:07:22 +0100
8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp
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_bsd
65 # include "globals_bsd.hpp"
66 #endif
67 #ifdef TARGET_OS_ARCH_linux_x86
68 # include "globals_linux_x86.hpp"
69 #endif
70 #ifdef TARGET_OS_ARCH_linux_sparc
71 # include "globals_linux_sparc.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_zero
74 # include "globals_linux_zero.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_solaris_x86
77 # include "globals_solaris_x86.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_solaris_sparc
80 # include "globals_solaris_sparc.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_windows_x86
83 # include "globals_windows_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_linux_arm
86 # include "globals_linux_arm.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_linux_ppc
89 # include "globals_linux_ppc.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_bsd_x86
92 # include "globals_bsd_x86.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_bsd_zero
95 # include "globals_bsd_zero.hpp"
96 #endif
97 #ifdef COMPILER1
98 #ifdef TARGET_ARCH_x86
99 # include "c1_globals_x86.hpp"
100 #endif
101 #ifdef TARGET_ARCH_sparc
102 # include "c1_globals_sparc.hpp"
103 #endif
104 #ifdef TARGET_ARCH_arm
105 # include "c1_globals_arm.hpp"
106 #endif
107 #ifdef TARGET_ARCH_ppc
108 # include "c1_globals_ppc.hpp"
109 #endif
110 #ifdef TARGET_OS_FAMILY_linux
111 # include "c1_globals_linux.hpp"
112 #endif
113 #ifdef TARGET_OS_FAMILY_solaris
114 # include "c1_globals_solaris.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_windows
117 # include "c1_globals_windows.hpp"
118 #endif
119 #ifdef TARGET_OS_FAMILY_bsd
120 # include "c1_globals_bsd.hpp"
121 #endif
122 #endif
123 #ifdef COMPILER2
124 #ifdef TARGET_ARCH_x86
125 # include "c2_globals_x86.hpp"
126 #endif
127 #ifdef TARGET_ARCH_sparc
128 # include "c2_globals_sparc.hpp"
129 #endif
130 #ifdef TARGET_ARCH_arm
131 # include "c2_globals_arm.hpp"
132 #endif
133 #ifdef TARGET_OS_FAMILY_linux
134 # include "c2_globals_linux.hpp"
135 #endif
136 #ifdef TARGET_OS_FAMILY_solaris
137 # include "c2_globals_solaris.hpp"
138 #endif
139 #ifdef TARGET_OS_FAMILY_windows
140 # include "c2_globals_windows.hpp"
141 #endif
142 #ifdef TARGET_OS_FAMILY_bsd
143 # include "c2_globals_bsd.hpp"
144 #endif
145 #endif
146 #ifdef SHARK
147 #ifdef TARGET_ARCH_zero
148 # include "shark_globals_zero.hpp"
149 #endif
150 #endif
152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
153 define_pd_global(bool, BackgroundCompilation, false);
154 define_pd_global(bool, UseTLAB, false);
155 define_pd_global(bool, CICompileOSR, false);
156 define_pd_global(bool, UseTypeProfile, false);
157 define_pd_global(bool, UseOnStackReplacement, false);
158 define_pd_global(bool, InlineIntrinsics, false);
159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
160 define_pd_global(bool, ProfileInterpreter, false);
161 define_pd_global(bool, ProfileTraps, false);
162 define_pd_global(bool, TieredCompilation, false);
164 define_pd_global(intx, CompileThreshold, 0);
165 define_pd_global(intx, BackEdgeThreshold, 0);
167 define_pd_global(intx, OnStackReplacePercentage, 0);
168 define_pd_global(bool, ResizeTLAB, false);
169 define_pd_global(intx, FreqInlineSize, 0);
170 define_pd_global(intx, InlineSmallCode, 0);
171 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
172 define_pd_global(intx, InlineClassNatives, true);
173 define_pd_global(intx, InlineUnsafeOps, true);
174 define_pd_global(intx, InitialCodeCacheSize, 160*K);
175 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
176 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
177 define_pd_global(intx, CodeCacheMinBlockLength, 1);
178 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
179 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M));
180 define_pd_global(bool, NeverActAsServerClassMachine, true);
181 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
182 #define CI_COMPILER_COUNT 0
183 #else
185 #ifdef COMPILER2
186 #define CI_COMPILER_COUNT 2
187 #else
188 #define CI_COMPILER_COUNT 1
189 #endif // COMPILER2
191 #endif // no compilers
193 // string type aliases used only in this file
194 typedef const char* ccstr;
195 typedef const char* ccstrlist; // represents string arguments which accumulate
197 struct Flag {
198 enum Flags {
199 // value origin
200 DEFAULT = 0,
201 COMMAND_LINE = 1,
202 ENVIRON_VAR = 2,
203 CONFIG_FILE = 3,
204 MANAGEMENT = 4,
205 ERGONOMIC = 5,
206 ATTACH_ON_DEMAND = 6,
207 INTERNAL = 7,
209 LAST_VALUE_ORIGIN = INTERNAL,
210 VALUE_ORIGIN_BITS = 4,
211 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
213 // flag kind
214 KIND_PRODUCT = 1 << 4,
215 KIND_MANAGEABLE = 1 << 5,
216 KIND_DIAGNOSTIC = 1 << 6,
217 KIND_EXPERIMENTAL = 1 << 7,
218 KIND_NOT_PRODUCT = 1 << 8,
219 KIND_DEVELOP = 1 << 9,
220 KIND_PLATFORM_DEPENDENT = 1 << 10,
221 KIND_READ_WRITE = 1 << 11,
222 KIND_C1 = 1 << 12,
223 KIND_C2 = 1 << 13,
224 KIND_ARCH = 1 << 14,
225 KIND_SHARK = 1 << 15,
226 KIND_LP64_PRODUCT = 1 << 16,
227 KIND_COMMERCIAL = 1 << 17,
229 KIND_MASK = ~VALUE_ORIGIN_MASK
230 };
232 const char* _type;
233 const char* _name;
234 void* _addr;
235 NOT_PRODUCT(const char* _doc;)
236 Flags _flags;
238 // points to all Flags static array
239 static Flag* flags;
241 // number of flags
242 static size_t numFlags;
244 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
245 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
247 void check_writable();
249 bool is_bool() const;
250 bool get_bool() const;
251 void set_bool(bool value);
253 bool is_intx() const;
254 intx get_intx() const;
255 void set_intx(intx value);
257 bool is_uintx() const;
258 uintx get_uintx() const;
259 void set_uintx(uintx value);
261 bool is_uint64_t() const;
262 uint64_t get_uint64_t() const;
263 void set_uint64_t(uint64_t value);
265 bool is_double() const;
266 double get_double() const;
267 void set_double(double value);
269 bool is_ccstr() const;
270 bool ccstr_accumulates() const;
271 ccstr get_ccstr() const;
272 void set_ccstr(ccstr value);
274 Flags get_origin();
275 void set_origin(Flags origin);
277 bool is_default();
278 bool is_ergonomic();
279 bool is_command_line();
281 bool is_product() const;
282 bool is_manageable() const;
283 bool is_diagnostic() const;
284 bool is_experimental() const;
285 bool is_notproduct() const;
286 bool is_develop() const;
287 bool is_read_write() const;
288 bool is_commercial() const;
290 bool is_constant_in_binary() const;
292 bool is_unlocker() const;
293 bool is_unlocked() const;
294 bool is_writeable() const;
295 bool is_external() const;
297 bool is_unlocker_ext() const;
298 bool is_unlocked_ext() const;
299 bool is_writeable_ext() const;
300 bool is_external_ext() const;
302 void get_locked_message(char*, int) const;
303 void get_locked_message_ext(char*, int) const;
305 void print_on(outputStream* st, bool withComments = false );
306 void print_kind(outputStream* st);
307 void print_as_flag(outputStream* st);
308 };
310 // debug flags control various aspects of the VM and are global accessible
312 // use FlagSetting to temporarily change some debug flag
313 // e.g. FlagSetting fs(DebugThisAndThat, true);
314 // restored to previous value upon leaving scope
315 class FlagSetting {
316 bool val;
317 bool* flag;
318 public:
319 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
320 ~FlagSetting() { *flag = val; }
321 };
324 class CounterSetting {
325 intx* counter;
326 public:
327 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
328 ~CounterSetting() { (*counter)--; }
329 };
332 class UIntFlagSetting {
333 uintx val;
334 uintx* flag;
335 public:
336 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
337 ~UIntFlagSetting() { *flag = val; }
338 };
341 class DoubleFlagSetting {
342 double val;
343 double* flag;
344 public:
345 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
346 ~DoubleFlagSetting() { *flag = val; }
347 };
350 class CommandLineFlags {
351 public:
352 static bool boolAt(char* name, size_t len, bool* value);
353 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
354 static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
355 static bool boolAtPut(char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
357 static bool intxAt(char* name, size_t len, intx* value);
358 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
359 static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
360 static bool intxAtPut(char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
362 static bool uintxAt(char* name, size_t len, uintx* value);
363 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
364 static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
365 static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
367 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
368 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
369 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
370 static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
372 static bool doubleAt(char* name, size_t len, double* value);
373 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
374 static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
375 static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
377 static bool ccstrAt(char* name, size_t len, ccstr* value);
378 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
379 static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
380 static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
382 // Returns false if name is not a command line flag.
383 static bool wasSetOnCmdline(const char* name, bool* value);
384 static void printSetFlags(outputStream* out);
386 static void printFlags(outputStream* out, bool withComments);
388 static void verify() PRODUCT_RETURN;
389 };
391 // use this for flags that are true by default in the debug version but
392 // false in the optimized version, and vice versa
393 #ifdef ASSERT
394 #define trueInDebug true
395 #define falseInDebug false
396 #else
397 #define trueInDebug false
398 #define falseInDebug true
399 #endif
401 // use this for flags that are true per default in the product build
402 // but false in development builds, and vice versa
403 #ifdef PRODUCT
404 #define trueInProduct true
405 #define falseInProduct false
406 #else
407 #define trueInProduct false
408 #define falseInProduct true
409 #endif
411 #ifdef JAVASE_EMBEDDED
412 #define falseInEmbedded false
413 #else
414 #define falseInEmbedded true
415 #endif
417 // develop flags are settable / visible only during development and are constant in the PRODUCT version
418 // product flags are always settable / visible
419 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
421 // A flag must be declared with one of the following types:
422 // bool, intx, uintx, ccstr.
423 // The type "ccstr" is an alias for "const char*" and is used
424 // only in this file, because the macrology requires single-token type names.
426 // Note: Diagnostic options not meant for VM tuning or for product modes.
427 // They are to be used for VM quality assurance or field diagnosis
428 // of VM bugs. They are hidden so that users will not be encouraged to
429 // try them as if they were VM ordinary execution options. However, they
430 // are available in the product version of the VM. Under instruction
431 // from support engineers, VM customers can turn them on to collect
432 // diagnostic information about VM problems. To use a VM diagnostic
433 // option, you must first specify +UnlockDiagnosticVMOptions.
434 // (This master switch also affects the behavior of -Xprintflags.)
435 //
436 // experimental flags are in support of features that are not
437 // part of the officially supported product, but are available
438 // for experimenting with. They could, for example, be performance
439 // features that may not have undergone full or rigorous QA, but which may
440 // help performance in some cases and released for experimentation
441 // by the community of users and developers. This flag also allows one to
442 // be able to build a fully supported product that nonetheless also
443 // ships with some unsupported, lightly tested, experimental features.
444 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
445 // UnlockExperimentalVMOptions flag, which allows the control and
446 // modification of the experimental flags.
447 //
448 // Nota bene: neither diagnostic nor experimental options should be used casually,
449 // and they are not supported on production loads, except under explicit
450 // direction from support engineers.
451 //
452 // manageable flags are writeable external product flags.
453 // They are dynamically writeable through the JDK management interface
454 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
455 // These flags are external exported interface (see CCC). The list of
456 // manageable flags can be queried programmatically through the management
457 // interface.
458 //
459 // A flag can be made as "manageable" only if
460 // - the flag is defined in a CCC as an external exported interface.
461 // - the VM implementation supports dynamic setting of the flag.
462 // This implies that the VM must *always* query the flag variable
463 // and not reuse state related to the flag state at any given time.
464 // - you want the flag to be queried programmatically by the customers.
465 //
466 // product_rw flags are writeable internal product flags.
467 // They are like "manageable" flags but for internal/private use.
468 // The list of product_rw flags are internal/private flags which
469 // may be changed/removed in a future release. It can be set
470 // through the management interface to get/set value
471 // when the name of flag is supplied.
472 //
473 // A flag can be made as "product_rw" only if
474 // - the VM implementation supports dynamic setting of the flag.
475 // This implies that the VM must *always* query the flag variable
476 // and not reuse state related to the flag state at any given time.
477 //
478 // Note that when there is a need to support develop flags to be writeable,
479 // it can be done in the same way as product_rw.
481 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
482 \
483 lp64_product(bool, UseCompressedOops, false, \
484 "Use 32-bit object references in 64-bit VM. " \
485 "lp64_product means flag is always constant in 32 bit VM") \
486 \
487 lp64_product(bool, UseCompressedClassPointers, false, \
488 "Use 32-bit class pointers in 64-bit VM. " \
489 "lp64_product means flag is always constant in 32 bit VM") \
490 \
491 notproduct(bool, CheckCompressedOops, true, \
492 "Generate checks in encoding/decoding code in debug VM") \
493 \
494 product_pd(uintx, HeapBaseMinAddress, \
495 "OS specific low limit for heap base address") \
496 \
497 diagnostic(bool, PrintCompressedOopsMode, false, \
498 "Print compressed oops base address and encoding mode") \
499 \
500 lp64_product(intx, ObjectAlignmentInBytes, 8, \
501 "Default object alignment in bytes, 8 is minimum") \
502 \
503 product(bool, AssumeMP, false, \
504 "Instruct the VM to assume multiple processors are available") \
505 \
506 /* UseMembar is theoretically a temp flag used for memory barrier \
507 * removal testing. It was supposed to be removed before FCS but has \
508 * been re-added (see 6401008) */ \
509 product_pd(bool, UseMembar, \
510 "(Unstable) Issues membars on thread state transitions") \
511 \
512 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
513 * that don't support it. This will be replaced by processor detection \
514 * logic. \
515 */ \
516 product(bool, UsePPCLWSYNC, true, \
517 "Use lwsync instruction if true, else use slower sync") \
518 \
519 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
520 "Clean the chunk pool asynchronously") \
521 \
522 /* Temporary: See 6948537 */ \
523 experimental(bool, UseMemSetInBOT, true, \
524 "(Unstable) uses memset in BOT updates in GC code") \
525 \
526 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
527 "Enable normal processing of flags relating to field diagnostics")\
528 \
529 experimental(bool, UnlockExperimentalVMOptions, false, \
530 "Enable normal processing of flags relating to experimental " \
531 "features") \
532 \
533 product(bool, JavaMonitorsInStackTrace, true, \
534 "Print information about Java monitor locks when the stacks are" \
535 "dumped") \
536 \
537 product_pd(bool, UseLargePages, \
538 "Use large page memory") \
539 \
540 product_pd(bool, UseLargePagesIndividualAllocation, \
541 "Allocate large pages individually for better affinity") \
542 \
543 develop(bool, LargePagesIndividualAllocationInjectError, false, \
544 "Fail large pages individual allocation") \
545 \
546 product(bool, UseLargePagesInMetaspace, false, \
547 "Use large page memory in metaspace. " \
548 "Only used if UseLargePages is enabled.") \
549 \
550 develop(bool, TracePageSizes, false, \
551 "Trace page size selection and usage") \
552 \
553 product(bool, UseNUMA, false, \
554 "Use NUMA if available") \
555 \
556 product(bool, UseNUMAInterleaving, false, \
557 "Interleave memory across NUMA nodes if available") \
558 \
559 product(uintx, NUMAInterleaveGranularity, 2*M, \
560 "Granularity to use for NUMA interleaving on Windows OS") \
561 \
562 product(bool, ForceNUMA, false, \
563 "Force NUMA optimizations on single-node/UMA systems") \
564 \
565 product(uintx, NUMAChunkResizeWeight, 20, \
566 "Percentage (0-100) used to weigh the current sample when " \
567 "computing exponentially decaying average for " \
568 "AdaptiveNUMAChunkSizing") \
569 \
570 product(uintx, NUMASpaceResizeRate, 1*G, \
571 "Do not reallocate more than this amount per collection") \
572 \
573 product(bool, UseAdaptiveNUMAChunkSizing, true, \
574 "Enable adaptive chunk sizing for NUMA") \
575 \
576 product(bool, NUMAStats, false, \
577 "Print NUMA stats in detailed heap information") \
578 \
579 product(uintx, NUMAPageScanRate, 256, \
580 "Maximum number of pages to include in the page scan procedure") \
581 \
582 product_pd(bool, NeedsDeoptSuspend, \
583 "True for register window machines (sparc/ia64)") \
584 \
585 product(intx, UseSSE, 99, \
586 "Highest supported SSE instructions set on x86/x64") \
587 \
588 product(bool, UseAES, false, \
589 "Control whether AES instructions can be used on x86/x64") \
590 \
591 product(uintx, LargePageSizeInBytes, 0, \
592 "Large page size (0 to let VM choose the page size)") \
593 \
594 product(uintx, LargePageHeapSizeThreshold, 128*M, \
595 "Use large pages if maximum heap is at least this big") \
596 \
597 product(bool, ForceTimeHighResolution, false, \
598 "Using high time resolution (for Win32 only)") \
599 \
600 develop(bool, TraceItables, false, \
601 "Trace initialization and use of itables") \
602 \
603 develop(bool, TracePcPatching, false, \
604 "Trace usage of frame::patch_pc") \
605 \
606 develop(bool, TraceJumps, false, \
607 "Trace assembly jumps in thread ring buffer") \
608 \
609 develop(bool, TraceRelocator, false, \
610 "Trace the bytecode relocator") \
611 \
612 develop(bool, TraceLongCompiles, false, \
613 "Print out every time compilation is longer than " \
614 "a given threshold") \
615 \
616 develop(bool, SafepointALot, false, \
617 "Generate a lot of safepoints. This works with " \
618 "GuaranteedSafepointInterval") \
619 \
620 product_pd(bool, BackgroundCompilation, \
621 "A thread requesting compilation is not blocked during " \
622 "compilation") \
623 \
624 product(bool, PrintVMQWaitTime, false, \
625 "Print out the waiting time in VM operation queue") \
626 \
627 develop(bool, NoYieldsInMicrolock, false, \
628 "Disable yields in microlock") \
629 \
630 develop(bool, TraceOopMapGeneration, false, \
631 "Show OopMapGeneration") \
632 \
633 product(bool, MethodFlushing, true, \
634 "Reclamation of zombie and not-entrant methods") \
635 \
636 develop(bool, VerifyStack, false, \
637 "Verify stack of each thread when it is entering a runtime call") \
638 \
639 diagnostic(bool, ForceUnreachable, false, \
640 "Make all non code cache addresses to be unreachable by " \
641 "forcing use of 64bit literal fixups") \
642 \
643 notproduct(bool, StressDerivedPointers, false, \
644 "Force scavenge when a derived pointer is detected on stack " \
645 "after rtm call") \
646 \
647 develop(bool, TraceDerivedPointers, false, \
648 "Trace traversal of derived pointers on stack") \
649 \
650 notproduct(bool, TraceCodeBlobStacks, false, \
651 "Trace stack-walk of codeblobs") \
652 \
653 product(bool, PrintJNIResolving, false, \
654 "Used to implement -v:jni") \
655 \
656 notproduct(bool, PrintRewrites, false, \
657 "Print methods that are being rewritten") \
658 \
659 product(bool, UseInlineCaches, true, \
660 "Use Inline Caches for virtual calls ") \
661 \
662 develop(bool, InlineArrayCopy, true, \
663 "Inline arraycopy native that is known to be part of " \
664 "base library DLL") \
665 \
666 develop(bool, InlineObjectHash, true, \
667 "Inline Object::hashCode() native that is known to be part " \
668 "of base library DLL") \
669 \
670 develop(bool, InlineNatives, true, \
671 "Inline natives that are known to be part of base library DLL") \
672 \
673 develop(bool, InlineMathNatives, true, \
674 "Inline SinD, CosD, etc.") \
675 \
676 develop(bool, InlineClassNatives, true, \
677 "Inline Class.isInstance, etc") \
678 \
679 develop(bool, InlineThreadNatives, true, \
680 "Inline Thread.currentThread, etc") \
681 \
682 develop(bool, InlineUnsafeOps, true, \
683 "Inline memory ops (native methods) from sun.misc.Unsafe") \
684 \
685 product(bool, CriticalJNINatives, true, \
686 "Check for critical JNI entry points") \
687 \
688 notproduct(bool, StressCriticalJNINatives, false, \
689 "Exercise register saving code in critical natives") \
690 \
691 product(bool, UseSSE42Intrinsics, false, \
692 "SSE4.2 versions of intrinsics") \
693 \
694 product(bool, UseAESIntrinsics, false, \
695 "Use intrinsics for AES versions of crypto") \
696 \
697 product(bool, UseCRC32Intrinsics, false, \
698 "use intrinsics for java.util.zip.CRC32") \
699 \
700 develop(bool, TraceCallFixup, false, \
701 "Trace all call fixups") \
702 \
703 develop(bool, DeoptimizeALot, false, \
704 "Deoptimize at every exit from the runtime system") \
705 \
706 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
707 "A comma separated list of bcis to deoptimize at") \
708 \
709 product(bool, DeoptimizeRandom, false, \
710 "Deoptimize random frames on random exit from the runtime system")\
711 \
712 notproduct(bool, ZombieALot, false, \
713 "Create zombies (non-entrant) at exit from the runtime system") \
714 \
715 product(bool, UnlinkSymbolsALot, false, \
716 "Unlink unreferenced symbols from the symbol table at safepoints")\
717 \
718 notproduct(bool, WalkStackALot, false, \
719 "Trace stack (no print) at every exit from the runtime system") \
720 \
721 product(bool, Debugging, false, \
722 "Set when executing debug methods in debug.cpp " \
723 "(to prevent triggering assertions)") \
724 \
725 notproduct(bool, StrictSafepointChecks, trueInDebug, \
726 "Enable strict checks that safepoints cannot happen for threads " \
727 "that use No_Safepoint_Verifier") \
728 \
729 notproduct(bool, VerifyLastFrame, false, \
730 "Verify oops on last frame on entry to VM") \
731 \
732 develop(bool, TraceHandleAllocation, false, \
733 "Print out warnings when suspiciously many handles are allocated")\
734 \
735 product(bool, UseCompilerSafepoints, true, \
736 "Stop at safepoints in compiled code") \
737 \
738 product(bool, FailOverToOldVerifier, true, \
739 "Fail over to old verifier when split verifier fails") \
740 \
741 develop(bool, ShowSafepointMsgs, false, \
742 "Show message about safepoint synchronization") \
743 \
744 product(bool, SafepointTimeout, false, \
745 "Time out and warn or fail after SafepointTimeoutDelay " \
746 "milliseconds if failed to reach safepoint") \
747 \
748 develop(bool, DieOnSafepointTimeout, false, \
749 "Die upon failure to reach safepoint (see SafepointTimeout)") \
750 \
751 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
752 /* typically, at most a few retries are needed */ \
753 product(intx, SuspendRetryCount, 50, \
754 "Maximum retry count for an external suspend request") \
755 \
756 product(intx, SuspendRetryDelay, 5, \
757 "Milliseconds to delay per retry (* current_retry_count)") \
758 \
759 product(bool, AssertOnSuspendWaitFailure, false, \
760 "Assert/Guarantee on external suspend wait failure") \
761 \
762 product(bool, TraceSuspendWaitFailures, false, \
763 "Trace external suspend wait failures") \
764 \
765 product(bool, MaxFDLimit, true, \
766 "Bump the number of file descriptors to maximum in Solaris") \
767 \
768 diagnostic(bool, LogEvents, true, \
769 "Enable the various ring buffer event logs") \
770 \
771 diagnostic(uintx, LogEventsBufferEntries, 10, \
772 "Number of ring buffer event logs") \
773 \
774 product(bool, BytecodeVerificationRemote, true, \
775 "Enable the Java bytecode verifier for remote classes") \
776 \
777 product(bool, BytecodeVerificationLocal, false, \
778 "Enable the Java bytecode verifier for local classes") \
779 \
780 develop(bool, ForceFloatExceptions, trueInDebug, \
781 "Force exceptions on FP stack under/overflow") \
782 \
783 develop(bool, VerifyStackAtCalls, false, \
784 "Verify that the stack pointer is unchanged after calls") \
785 \
786 develop(bool, TraceJavaAssertions, false, \
787 "Trace java language assertions") \
788 \
789 notproduct(bool, CheckAssertionStatusDirectives, false, \
790 "Temporary - see javaClasses.cpp") \
791 \
792 notproduct(bool, PrintMallocFree, false, \
793 "Trace calls to C heap malloc/free allocation") \
794 \
795 product(bool, PrintOopAddress, false, \
796 "Always print the location of the oop") \
797 \
798 notproduct(bool, VerifyCodeCacheOften, false, \
799 "Verify compiled-code cache often") \
800 \
801 develop(bool, ZapDeadCompiledLocals, false, \
802 "Zap dead locals in compiler frames") \
803 \
804 notproduct(bool, ZapDeadLocalsOld, false, \
805 "Zap dead locals (old version, zaps all frames when " \
806 "entering the VM") \
807 \
808 notproduct(bool, CheckOopishValues, false, \
809 "Warn if value contains oop (requires ZapDeadLocals)") \
810 \
811 develop(bool, UseMallocOnly, false, \
812 "Use only malloc/free for allocation (no resource area/arena)") \
813 \
814 develop(bool, PrintMalloc, false, \
815 "Print all malloc/free calls") \
816 \
817 develop(bool, PrintMallocStatistics, false, \
818 "Print malloc/free statistics") \
819 \
820 develop(bool, ZapResourceArea, trueInDebug, \
821 "Zap freed resource/arena space with 0xABABABAB") \
822 \
823 notproduct(bool, ZapVMHandleArea, trueInDebug, \
824 "Zap freed VM handle space with 0xBCBCBCBC") \
825 \
826 develop(bool, ZapJNIHandleArea, trueInDebug, \
827 "Zap freed JNI handle space with 0xFEFEFEFE") \
828 \
829 notproduct(bool, ZapStackSegments, trueInDebug, \
830 "Zap allocated/freed stack segments with 0xFADFADED") \
831 \
832 develop(bool, ZapUnusedHeapArea, trueInDebug, \
833 "Zap unused heap space with 0xBAADBABE") \
834 \
835 develop(bool, TraceZapUnusedHeapArea, false, \
836 "Trace zapping of unused heap space") \
837 \
838 develop(bool, CheckZapUnusedHeapArea, false, \
839 "Check zapping of unused heap space") \
840 \
841 develop(bool, ZapFillerObjects, trueInDebug, \
842 "Zap filler objects with 0xDEAFBABE") \
843 \
844 develop(bool, PrintVMMessages, true, \
845 "Print VM messages on console") \
846 \
847 product(bool, PrintGCApplicationConcurrentTime, false, \
848 "Print the time the application has been running") \
849 \
850 product(bool, PrintGCApplicationStoppedTime, false, \
851 "Print the time the application has been stopped") \
852 \
853 diagnostic(bool, VerboseVerification, false, \
854 "Display detailed verification details") \
855 \
856 notproduct(uintx, ErrorHandlerTest, 0, \
857 "If > 0, provokes an error after VM initialization; the value " \
858 "determines which error to provoke. See test_error_handler() " \
859 "in debug.cpp.") \
860 \
861 develop(bool, Verbose, false, \
862 "Print additional debugging information from other modes") \
863 \
864 develop(bool, PrintMiscellaneous, false, \
865 "Print uncategorized debugging information (requires +Verbose)") \
866 \
867 develop(bool, WizardMode, false, \
868 "Print much more debugging information") \
869 \
870 product(bool, ShowMessageBoxOnError, false, \
871 "Keep process alive on VM fatal error") \
872 \
873 product(bool, CreateMinidumpOnCrash, false, \
874 "Create minidump on VM fatal error") \
875 \
876 product_pd(bool, UseOSErrorReporting, \
877 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
878 \
879 product(bool, SuppressFatalErrorMessage, false, \
880 "Report NO fatal error message (avoid deadlock)") \
881 \
882 product(ccstrlist, OnError, "", \
883 "Run user-defined commands on fatal error; see VMError.cpp " \
884 "for examples") \
885 \
886 product(ccstrlist, OnOutOfMemoryError, "", \
887 "Run user-defined commands on first java.lang.OutOfMemoryError") \
888 \
889 manageable(bool, HeapDumpBeforeFullGC, false, \
890 "Dump heap to file before any major stop-the-world GC") \
891 \
892 manageable(bool, HeapDumpAfterFullGC, false, \
893 "Dump heap to file after any major stop-the-world GC") \
894 \
895 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
896 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
897 \
898 manageable(ccstr, HeapDumpPath, NULL, \
899 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
900 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
901 "in the working directory)") \
902 \
903 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
904 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
905 "when the heap usage is larger than this") \
906 \
907 develop(uintx, HeapDumpSegmentSize, 1*G, \
908 "Approximate segment size when generating a segmented heap dump") \
909 \
910 develop(bool, BreakAtWarning, false, \
911 "Execute breakpoint upon encountering VM warning") \
912 \
913 develop(bool, TraceVMOperation, false, \
914 "Trace VM operations") \
915 \
916 develop(bool, UseFakeTimers, false, \
917 "Tell whether the VM should use system time or a fake timer") \
918 \
919 product(ccstr, NativeMemoryTracking, "off", \
920 "Native memory tracking options") \
921 \
922 diagnostic(bool, PrintNMTStatistics, false, \
923 "Print native memory tracking summary data if it is on") \
924 \
925 diagnostic(bool, AutoShutdownNMT, true, \
926 "Automatically shutdown native memory tracking under stress " \
927 "situations. When set to false, native memory tracking tries to " \
928 "stay alive at the expense of JVM performance") \
929 \
930 diagnostic(bool, LogCompilation, false, \
931 "Log compilation activity in detail to LogFile") \
932 \
933 product(bool, PrintCompilation, false, \
934 "Print compilations") \
935 \
936 diagnostic(bool, TraceNMethodInstalls, false, \
937 "Trace nmethod installation") \
938 \
939 diagnostic(intx, ScavengeRootsInCode, 2, \
940 "0: do not allow scavengable oops in the code cache; " \
941 "1: allow scavenging from the code cache; " \
942 "2: emit as many constants as the compiler can see") \
943 \
944 product(bool, AlwaysRestoreFPU, false, \
945 "Restore the FPU control word after every JNI call (expensive)") \
946 \
947 diagnostic(bool, PrintCompilation2, false, \
948 "Print additional statistics per compilation") \
949 \
950 diagnostic(bool, PrintAdapterHandlers, false, \
951 "Print code generated for i2c/c2i adapters") \
952 \
953 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
954 "Verify that i2c/c2i adapters are called properly") \
955 \
956 develop(bool, VerifyAdapterSharing, false, \
957 "Verify that the code for shared adapters is the equivalent") \
958 \
959 diagnostic(bool, PrintAssembly, false, \
960 "Print assembly code (using external disassembler.so)") \
961 \
962 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
963 "Print options string passed to disassembler.so") \
964 \
965 diagnostic(bool, PrintNMethods, false, \
966 "Print assembly code for nmethods when generated") \
967 \
968 diagnostic(bool, PrintNativeNMethods, false, \
969 "Print assembly code for native nmethods when generated") \
970 \
971 develop(bool, PrintDebugInfo, false, \
972 "Print debug information for all nmethods when generated") \
973 \
974 develop(bool, PrintRelocations, false, \
975 "Print relocation information for all nmethods when generated") \
976 \
977 develop(bool, PrintDependencies, false, \
978 "Print dependency information for all nmethods when generated") \
979 \
980 develop(bool, PrintExceptionHandlers, false, \
981 "Print exception handler tables for all nmethods when generated") \
982 \
983 develop(bool, StressCompiledExceptionHandlers, false, \
984 "Exercise compiled exception handlers") \
985 \
986 develop(bool, InterceptOSException, false, \
987 "Start debugger when an implicit OS (e.g. NULL) " \
988 "exception happens") \
989 \
990 product(bool, PrintCodeCache, false, \
991 "Print the code cache memory usage when exiting") \
992 \
993 develop(bool, PrintCodeCache2, false, \
994 "Print detailed usage information on the code cache when exiting")\
995 \
996 product(bool, PrintCodeCacheOnCompilation, false, \
997 "Print the code cache memory usage each time a method is " \
998 "compiled") \
999 \
1000 diagnostic(bool, PrintStubCode, false, \
1001 "Print generated stub code") \
1002 \
1003 product(bool, StackTraceInThrowable, true, \
1004 "Collect backtrace in throwable when exception happens") \
1005 \
1006 product(bool, OmitStackTraceInFastThrow, true, \
1007 "Omit backtraces for some 'hot' exceptions in optimized code") \
1008 \
1009 product(bool, ProfilerPrintByteCodeStatistics, false, \
1010 "Print bytecode statistics when dumping profiler output") \
1011 \
1012 product(bool, ProfilerRecordPC, false, \
1013 "Collect ticks for each 16 byte interval of compiled code") \
1014 \
1015 product(bool, ProfileVM, false, \
1016 "Profile ticks that fall within VM (either in the VM Thread " \
1017 "or VM code called through stubs)") \
1018 \
1019 product(bool, ProfileIntervals, false, \
1020 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1021 \
1022 notproduct(bool, ProfilerCheckIntervals, false, \
1023 "Collect and print information on spacing of profiler ticks") \
1024 \
1025 develop(bool, PrintJVMWarnings, false, \
1026 "Print warnings for unimplemented JVM functions") \
1027 \
1028 product(bool, PrintWarnings, true, \
1029 "Print JVM warnings to output stream") \
1030 \
1031 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1032 "Print warnings for stalled SpinLocks") \
1033 \
1034 product(bool, RegisterFinalizersAtInit, true, \
1035 "Register finalizable objects at end of Object.<init> or " \
1036 "after allocation") \
1037 \
1038 develop(bool, RegisterReferences, true, \
1039 "Tell whether the VM should register soft/weak/final/phantom " \
1040 "references") \
1041 \
1042 develop(bool, IgnoreRewrites, false, \
1043 "Suppress rewrites of bytecodes in the oopmap generator. " \
1044 "This is unsafe!") \
1045 \
1046 develop(bool, PrintCodeCacheExtension, false, \
1047 "Print extension of code cache") \
1048 \
1049 develop(bool, UsePrivilegedStack, true, \
1050 "Enable the security JVM functions") \
1051 \
1052 develop(bool, ProtectionDomainVerification, true, \
1053 "Verify protection domain before resolution in system dictionary")\
1054 \
1055 product(bool, ClassUnloading, true, \
1056 "Do unloading of classes") \
1057 \
1058 develop(bool, DisableStartThread, false, \
1059 "Disable starting of additional Java threads " \
1060 "(for debugging only)") \
1061 \
1062 develop(bool, MemProfiling, false, \
1063 "Write memory usage profiling to log file") \
1064 \
1065 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1066 "Print the system dictionary at exit") \
1067 \
1068 experimental(intx, PredictedLoadedClassCount, 0, \
1069 "Experimental: Tune loaded class cache starting size") \
1070 \
1071 diagnostic(bool, UnsyncloadClass, false, \
1072 "Unstable: VM calls loadClass unsynchronized. Custom " \
1073 "class loader must call VM synchronized for findClass " \
1074 "and defineClass.") \
1075 \
1076 product(bool, AlwaysLockClassLoader, false, \
1077 "Require the VM to acquire the class loader lock before calling " \
1078 "loadClass() even for class loaders registering " \
1079 "as parallel capable") \
1080 \
1081 product(bool, AllowParallelDefineClass, false, \
1082 "Allow parallel defineClass requests for class loaders " \
1083 "registering as parallel capable") \
1084 \
1085 product(bool, MustCallLoadClassInternal, false, \
1086 "Call loadClassInternal() rather than loadClass()") \
1087 \
1088 product_pd(bool, DontYieldALot, \
1089 "Throw away obvious excess yield calls (for Solaris only)") \
1090 \
1091 product_pd(bool, ConvertSleepToYield, \
1092 "Convert sleep(0) to thread yield " \
1093 "(may be off for Solaris to improve GUI)") \
1094 \
1095 product(bool, ConvertYieldToSleep, false, \
1096 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1097 "behavior (Solaris only)") \
1098 \
1099 product(bool, UseBoundThreads, true, \
1100 "Bind user level threads to kernel threads (for Solaris only)") \
1101 \
1102 develop(bool, UseDetachedThreads, true, \
1103 "Use detached threads that are recycled upon termination " \
1104 "(for Solaris only)") \
1105 \
1106 product(bool, UseLWPSynchronization, true, \
1107 "Use LWP-based instead of libthread-based synchronization " \
1108 "(SPARC only)") \
1109 \
1110 product(ccstr, SyncKnobs, NULL, \
1111 "(Unstable) Various monitor synchronization tunables") \
1112 \
1113 product(intx, EmitSync, 0, \
1114 "(Unsafe, Unstable) " \
1115 "Control emission of inline sync fast-path code") \
1116 \
1117 product(intx, MonitorBound, 0, "Bound Monitor population") \
1118 \
1119 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1120 \
1121 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1122 \
1123 product(intx, SyncVerbose, 0, "(Unstable)") \
1124 \
1125 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1126 \
1127 product(intx, hashCode, 5, \
1128 "(Unstable) select hashCode generation algorithm") \
1129 \
1130 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1131 "(Unstable, Linux-specific) " \
1132 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1133 \
1134 product(bool, FilterSpuriousWakeups, true, \
1135 "Prevent spurious or premature wakeups from object.wait " \
1136 "(Solaris only)") \
1137 \
1138 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1139 \
1140 product(intx, NativeMonitorFlags, 0, "(Unstable)") \
1141 \
1142 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1143 \
1144 develop(bool, UsePthreads, false, \
1145 "Use pthread-based instead of libthread-based synchronization " \
1146 "(SPARC only)") \
1147 \
1148 product(bool, AdjustConcurrency, false, \
1149 "Call thr_setconcurrency at thread creation time to avoid " \
1150 "LWP starvation on MP systems (for Solaris Only)") \
1151 \
1152 product(bool, ReduceSignalUsage, false, \
1153 "Reduce the use of OS signals in Java and/or the VM") \
1154 \
1155 develop_pd(bool, ShareVtableStubs, \
1156 "Share vtable stubs (smaller code but worse branch prediction") \
1157 \
1158 develop(bool, LoadLineNumberTables, true, \
1159 "Tell whether the class file parser loads line number tables") \
1160 \
1161 develop(bool, LoadLocalVariableTables, true, \
1162 "Tell whether the class file parser loads local variable tables") \
1163 \
1164 develop(bool, LoadLocalVariableTypeTables, true, \
1165 "Tell whether the class file parser loads local variable type" \
1166 "tables") \
1167 \
1168 product(bool, AllowUserSignalHandlers, false, \
1169 "Do not complain if the application installs signal handlers " \
1170 "(Solaris & Linux only)") \
1171 \
1172 product(bool, UseSignalChaining, true, \
1173 "Use signal-chaining to invoke signal handlers installed " \
1174 "by the application (Solaris & Linux only)") \
1175 \
1176 product(bool, UseAltSigs, false, \
1177 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1178 "internal signals (Solaris only)") \
1179 \
1180 product(bool, AllowJNIEnvProxy, false, \
1181 "Allow JNIEnv proxies for jdbx") \
1182 \
1183 product(bool, JNIDetachReleasesMonitors, true, \
1184 "JNI DetachCurrentThread releases monitors owned by thread") \
1185 \
1186 product(bool, RestoreMXCSROnJNICalls, false, \
1187 "Restore MXCSR when returning from JNI calls") \
1188 \
1189 product(bool, CheckJNICalls, false, \
1190 "Verify all arguments to JNI calls") \
1191 \
1192 product(bool, UseFastJNIAccessors, true, \
1193 "Use optimized versions of Get<Primitive>Field") \
1194 \
1195 product(bool, EagerXrunInit, false, \
1196 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1197 "but not all -Xrun libraries may support the state of the VM " \
1198 "at this time") \
1199 \
1200 product(bool, PreserveAllAnnotations, false, \
1201 "Preserve RuntimeInvisibleAnnotations as well " \
1202 "as RuntimeVisibleAnnotations") \
1203 \
1204 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1205 "Number of OutOfMemoryErrors preallocated with backtrace") \
1206 \
1207 product(bool, LazyBootClassLoader, true, \
1208 "Enable/disable lazy opening of boot class path entries") \
1209 \
1210 product(bool, UseXMMForArrayCopy, false, \
1211 "Use SSE2 MOVQ instruction for Arraycopy") \
1212 \
1213 product(intx, FieldsAllocationStyle, 1, \
1214 "0 - type based with oops first, 1 - with oops last, " \
1215 "2 - oops in super and sub classes are together") \
1216 \
1217 product(bool, CompactFields, true, \
1218 "Allocate nonstatic fields in gaps between previous fields") \
1219 \
1220 notproduct(bool, PrintFieldLayout, false, \
1221 "Print field layout for each class") \
1222 \
1223 product(intx, ContendedPaddingWidth, 128, \
1224 "How many bytes to pad the fields/classes marked @Contended with")\
1225 \
1226 product(bool, EnableContended, true, \
1227 "Enable @Contended annotation support") \
1228 \
1229 product(bool, RestrictContended, true, \
1230 "Restrict @Contended to trusted classes") \
1231 \
1232 product(bool, UseBiasedLocking, true, \
1233 "Enable biased locking in JVM") \
1234 \
1235 product(intx, BiasedLockingStartupDelay, 4000, \
1236 "Number of milliseconds to wait before enabling biased locking") \
1237 \
1238 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1239 "Print statistics of biased locking in JVM") \
1240 \
1241 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1242 "Threshold of number of revocations per type to try to " \
1243 "rebias all objects in the heap of that type") \
1244 \
1245 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1246 "Threshold of number of revocations per type to permanently " \
1247 "revoke biases of all objects in the heap of that type") \
1248 \
1249 product(intx, BiasedLockingDecayTime, 25000, \
1250 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1251 "type after previous bulk rebias") \
1252 \
1253 /* tracing */ \
1254 \
1255 notproduct(bool, TraceRuntimeCalls, false, \
1256 "Trace run-time calls") \
1257 \
1258 develop(bool, TraceJNICalls, false, \
1259 "Trace JNI calls") \
1260 \
1261 develop(bool, StressRewriter, false, \
1262 "Stress linktime bytecode rewriting") \
1263 \
1264 notproduct(bool, TraceJVMCalls, false, \
1265 "Trace JVM calls") \
1266 \
1267 product(ccstr, TraceJVMTI, NULL, \
1268 "Trace flags for JVMTI functions and events") \
1269 \
1270 /* This option can change an EMCP method into an obsolete method. */ \
1271 /* This can affect tests that except specific methods to be EMCP. */ \
1272 /* This option should be used with caution. */ \
1273 product(bool, StressLdcRewrite, false, \
1274 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1275 \
1276 product(intx, TraceRedefineClasses, 0, \
1277 "Trace level for JVMTI RedefineClasses") \
1278 \
1279 develop(bool, StressMethodComparator, false, \
1280 "Run the MethodComparator on all loaded methods") \
1281 \
1282 /* change to false by default sometime after Mustang */ \
1283 product(bool, VerifyMergedCPBytecodes, true, \
1284 "Verify bytecodes after RedefineClasses constant pool merging") \
1285 \
1286 develop(bool, TraceJNIHandleAllocation, false, \
1287 "Trace allocation/deallocation of JNI handle blocks") \
1288 \
1289 develop(bool, TraceThreadEvents, false, \
1290 "Trace all thread events") \
1291 \
1292 develop(bool, TraceBytecodes, false, \
1293 "Trace bytecode execution") \
1294 \
1295 develop(bool, TraceClassInitialization, false, \
1296 "Trace class initialization") \
1297 \
1298 develop(bool, TraceExceptions, false, \
1299 "Trace exceptions") \
1300 \
1301 develop(bool, TraceICs, false, \
1302 "Trace inline cache changes") \
1303 \
1304 notproduct(bool, TraceInvocationCounterOverflow, false, \
1305 "Trace method invocation counter overflow") \
1306 \
1307 develop(bool, TraceInlineCacheClearing, false, \
1308 "Trace clearing of inline caches in nmethods") \
1309 \
1310 develop(bool, TraceDependencies, false, \
1311 "Trace dependencies") \
1312 \
1313 develop(bool, VerifyDependencies, trueInDebug, \
1314 "Exercise and verify the compilation dependency mechanism") \
1315 \
1316 develop(bool, TraceNewOopMapGeneration, false, \
1317 "Trace OopMapGeneration") \
1318 \
1319 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1320 "Trace OopMapGeneration: print detailed cell states") \
1321 \
1322 develop(bool, TimeOopMap, false, \
1323 "Time calls to GenerateOopMap::compute_map() in sum") \
1324 \
1325 develop(bool, TimeOopMap2, false, \
1326 "Time calls to GenerateOopMap::compute_map() individually") \
1327 \
1328 develop(bool, TraceMonitorMismatch, false, \
1329 "Trace monitor matching failures during OopMapGeneration") \
1330 \
1331 develop(bool, TraceOopMapRewrites, false, \
1332 "Trace rewriting of method oops during oop map generation") \
1333 \
1334 develop(bool, TraceSafepoint, false, \
1335 "Trace safepoint operations") \
1336 \
1337 develop(bool, TraceICBuffer, false, \
1338 "Trace usage of IC buffer") \
1339 \
1340 develop(bool, TraceCompiledIC, false, \
1341 "Trace changes of compiled IC") \
1342 \
1343 notproduct(bool, TraceZapDeadLocals, false, \
1344 "Trace zapping dead locals") \
1345 \
1346 develop(bool, TraceStartupTime, false, \
1347 "Trace setup time") \
1348 \
1349 develop(bool, TraceProtectionDomainVerification, false, \
1350 "Trace protection domain verification") \
1351 \
1352 develop(bool, TraceClearedExceptions, false, \
1353 "Print when an exception is forcibly cleared") \
1354 \
1355 product(bool, TraceClassResolution, false, \
1356 "Trace all constant pool resolutions (for debugging)") \
1357 \
1358 product(bool, TraceBiasedLocking, false, \
1359 "Trace biased locking in JVM") \
1360 \
1361 product(bool, TraceMonitorInflation, false, \
1362 "Trace monitor inflation in JVM") \
1363 \
1364 /* gc */ \
1365 \
1366 product(bool, UseSerialGC, false, \
1367 "Use the Serial garbage collector") \
1368 \
1369 product(bool, UseG1GC, false, \
1370 "Use the Garbage-First garbage collector") \
1371 \
1372 product(bool, UseParallelGC, false, \
1373 "Use the Parallel Scavenge garbage collector") \
1374 \
1375 product(bool, UseParallelOldGC, false, \
1376 "Use the Parallel Old garbage collector") \
1377 \
1378 product(uintx, HeapMaximumCompactionInterval, 20, \
1379 "How often should we maximally compact the heap (not allowing " \
1380 "any dead space)") \
1381 \
1382 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1383 "The collection count for the first maximum compaction") \
1384 \
1385 product(bool, UseMaximumCompactionOnSystemGC, true, \
1386 "Use maximum compaction in the Parallel Old garbage collector " \
1387 "for a system GC") \
1388 \
1389 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1390 "The mean used by the parallel compact dead wood " \
1391 "limiter (a number between 0-100)") \
1392 \
1393 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1394 "The standard deviation used by the parallel compact dead wood " \
1395 "limiter (a number between 0-100)") \
1396 \
1397 product(uintx, ParallelGCThreads, 0, \
1398 "Number of parallel threads parallel gc will use") \
1399 \
1400 product(bool, UseDynamicNumberOfGCThreads, false, \
1401 "Dynamically choose the number of parallel threads " \
1402 "parallel gc will use") \
1403 \
1404 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1405 "Force dynamic selection of the number of " \
1406 "parallel threads parallel gc will use to aid debugging") \
1407 \
1408 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1409 "Size of heap (bytes) per GC thread used in calculating the " \
1410 "number of GC threads") \
1411 \
1412 product(bool, TraceDynamicGCThreads, false, \
1413 "Trace the dynamic GC thread usage") \
1414 \
1415 develop(bool, ParallelOldGCSplitALot, false, \
1416 "Provoke splitting (copying data from a young gen space to " \
1417 "multiple destination spaces)") \
1418 \
1419 develop(uintx, ParallelOldGCSplitInterval, 3, \
1420 "How often to provoke splitting a young gen space") \
1421 \
1422 product(uintx, ConcGCThreads, 0, \
1423 "Number of threads concurrent gc will use") \
1424 \
1425 product(uintx, YoungPLABSize, 4096, \
1426 "Size of young gen promotion LAB's (in HeapWords)") \
1427 \
1428 product(uintx, OldPLABSize, 1024, \
1429 "Size of old gen promotion LAB's (in HeapWords)") \
1430 \
1431 product(uintx, GCTaskTimeStampEntries, 200, \
1432 "Number of time stamp entries per gc worker thread") \
1433 \
1434 product(bool, AlwaysTenure, false, \
1435 "Always tenure objects in eden (ParallelGC only)") \
1436 \
1437 product(bool, NeverTenure, false, \
1438 "Never tenure objects in eden, may tenure on overflow " \
1439 "(ParallelGC only)") \
1440 \
1441 product(bool, ScavengeBeforeFullGC, true, \
1442 "Scavenge youngest generation before each full GC, " \
1443 "used with UseParallelGC") \
1444 \
1445 develop(bool, ScavengeWithObjectsInToSpace, false, \
1446 "Allow scavenges to occur when to-space contains objects") \
1447 \
1448 product(bool, UseConcMarkSweepGC, false, \
1449 "Use Concurrent Mark-Sweep GC in the old generation") \
1450 \
1451 product(bool, ExplicitGCInvokesConcurrent, false, \
1452 "A System.gc() request invokes a concurrent collection; " \
1453 "(effective only when UseConcMarkSweepGC)") \
1454 \
1455 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1456 "A System.gc() request invokes a concurrent collection and " \
1457 "also unloads classes during such a concurrent gc cycle " \
1458 "(effective only when UseConcMarkSweepGC)") \
1459 \
1460 product(bool, GCLockerInvokesConcurrent, false, \
1461 "The exit of a JNI critical section necessitating a scavenge, " \
1462 "also kicks off a background concurrent collection") \
1463 \
1464 product(uintx, GCLockerEdenExpansionPercent, 5, \
1465 "How much the GC can expand the eden by while the GC locker " \
1466 "is active (as a percentage)") \
1467 \
1468 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1469 "Number of times to retry allocations when " \
1470 "blocked by the GC locker") \
1471 \
1472 develop(bool, UseCMSAdaptiveFreeLists, true, \
1473 "Use adaptive free lists in the CMS generation") \
1474 \
1475 develop(bool, UseAsyncConcMarkSweepGC, true, \
1476 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1477 \
1478 develop(bool, RotateCMSCollectionTypes, false, \
1479 "Rotate the CMS collections among concurrent and STW") \
1480 \
1481 product(bool, UseCMSBestFit, true, \
1482 "Use CMS best fit allocation strategy") \
1483 \
1484 product(bool, UseCMSCollectionPassing, true, \
1485 "Use passing of collection from background to foreground") \
1486 \
1487 product(bool, UseParNewGC, false, \
1488 "Use parallel threads in the new generation") \
1489 \
1490 product(bool, ParallelGCVerbose, false, \
1491 "Verbose output for parallel gc") \
1492 \
1493 product(uintx, ParallelGCBufferWastePct, 10, \
1494 "Wasted fraction of parallel allocation buffer") \
1495 \
1496 diagnostic(bool, ParallelGCRetainPLAB, false, \
1497 "Retain parallel allocation buffers across scavenges; " \
1498 "it is disabled because this currently conflicts with " \
1499 "parallel card scanning under certain conditions.") \
1500 \
1501 product(uintx, TargetPLABWastePct, 10, \
1502 "Target wasted space in last buffer as percent of overall " \
1503 "allocation") \
1504 \
1505 product(uintx, PLABWeight, 75, \
1506 "Percentage (0-100) used to weigh the current sample when " \
1507 "computing exponentially decaying average for ResizePLAB") \
1508 \
1509 product(bool, ResizePLAB, true, \
1510 "Dynamically resize (survivor space) promotion LAB's") \
1511 \
1512 product(bool, PrintPLAB, false, \
1513 "Print (survivor space) promotion LAB's sizing decisions") \
1514 \
1515 product(intx, ParGCArrayScanChunk, 50, \
1516 "Scan a subset of object array and push remainder, if array is " \
1517 "bigger than this") \
1518 \
1519 product(bool, ParGCUseLocalOverflow, false, \
1520 "Instead of a global overflow list, use local overflow stacks") \
1521 \
1522 product(bool, ParGCTrimOverflow, true, \
1523 "Eagerly trim the local overflow lists " \
1524 "(when ParGCUseLocalOverflow)") \
1525 \
1526 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1527 "Simulate work queue overflow in ParNew") \
1528 \
1529 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1530 "An `interval' counter that determines how frequently " \
1531 "we simulate overflow; a smaller number increases frequency") \
1532 \
1533 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1534 "The desired number of objects to claim from the overflow list") \
1535 \
1536 diagnostic(uintx, ParGCStridesPerThread, 2, \
1537 "The number of strides per worker thread that we divide up the " \
1538 "card table scanning work into") \
1539 \
1540 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1541 "The number of cards in each chunk of the parallel chunks used " \
1542 "during card table scanning") \
1543 \
1544 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1545 "Number of blocks to attempt to claim when refilling CMS LAB's " \
1546 "for parallel GC") \
1547 \
1548 product(uintx, OldPLABWeight, 50, \
1549 "Percentage (0-100) used to weight the current sample when " \
1550 "computing exponentially decaying average for resizing " \
1551 "CMSParPromoteBlocksToClaim") \
1552 \
1553 product(bool, ResizeOldPLAB, true, \
1554 "Dynamically resize (old gen) promotion LAB's") \
1555 \
1556 product(bool, PrintOldPLAB, false, \
1557 "Print (old gen) promotion LAB's sizing decisions") \
1558 \
1559 product(uintx, CMSOldPLABMin, 16, \
1560 "Minimum size of CMS gen promotion LAB caches per worker " \
1561 "per block size") \
1562 \
1563 product(uintx, CMSOldPLABMax, 1024, \
1564 "Maximum size of CMS gen promotion LAB caches per worker " \
1565 "per block size") \
1566 \
1567 product(uintx, CMSOldPLABNumRefills, 4, \
1568 "Nominal number of refills of CMS gen promotion LAB cache " \
1569 "per worker per block size") \
1570 \
1571 product(bool, CMSOldPLABResizeQuicker, false, \
1572 "React on-the-fly during a scavenge to a sudden " \
1573 "change in block demand rate") \
1574 \
1575 product(uintx, CMSOldPLABToleranceFactor, 4, \
1576 "The tolerance of the phase-change detector for on-the-fly " \
1577 "PLAB resizing during a scavenge") \
1578 \
1579 product(uintx, CMSOldPLABReactivityFactor, 2, \
1580 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1581 "during a scavenge") \
1582 \
1583 product(bool, AlwaysPreTouch, false, \
1584 "Force all freshly committed pages to be pre-touched") \
1585 \
1586 product_pd(uintx, CMSYoungGenPerWorker, \
1587 "The maximum size of young gen chosen by default per GC worker " \
1588 "thread available") \
1589 \
1590 product(bool, CMSIncrementalMode, false, \
1591 "Whether CMS GC should operate in \"incremental\" mode") \
1592 \
1593 product(uintx, CMSIncrementalDutyCycle, 10, \
1594 "Percentage (0-100) of CMS incremental mode duty cycle. If " \
1595 "CMSIncrementalPacing is enabled, then this is just the initial " \
1596 "value.") \
1597 \
1598 product(bool, CMSIncrementalPacing, true, \
1599 "Whether the CMS incremental mode duty cycle should be " \
1600 "automatically adjusted") \
1601 \
1602 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1603 "Minimum percentage (0-100) of the CMS incremental duty cycle " \
1604 "used when CMSIncrementalPacing is enabled") \
1605 \
1606 product(uintx, CMSIncrementalSafetyFactor, 10, \
1607 "Percentage (0-100) used to add conservatism when computing the " \
1608 "duty cycle") \
1609 \
1610 product(uintx, CMSIncrementalOffset, 0, \
1611 "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1612 "is shifted to the right within the period between young GCs") \
1613 \
1614 product(uintx, CMSExpAvgFactor, 50, \
1615 "Percentage (0-100) used to weigh the current sample when " \
1616 "computing exponential averages for CMS statistics") \
1617 \
1618 product(uintx, CMS_FLSWeight, 75, \
1619 "Percentage (0-100) used to weigh the current sample when " \
1620 "computing exponentially decaying averages for CMS FLS " \
1621 "statistics") \
1622 \
1623 product(uintx, CMS_FLSPadding, 1, \
1624 "The multiple of deviation from mean to use for buffering " \
1625 "against volatility in free list demand") \
1626 \
1627 product(uintx, FLSCoalescePolicy, 2, \
1628 "CMS: aggressiveness level for coalescing, increasing " \
1629 "from 0 to 4") \
1630 \
1631 product(bool, FLSAlwaysCoalesceLarge, false, \
1632 "CMS: larger free blocks are always available for coalescing") \
1633 \
1634 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1635 "CMS: the smaller the percentage the greater the coalescing " \
1636 "force") \
1637 \
1638 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1639 "CMS: the factor by which to inflate estimated demand of small " \
1640 "block sizes to prevent coalescing with an adjoining block") \
1641 \
1642 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1643 "CMS: the factor by which to inflate estimated demand of large " \
1644 "block sizes to prevent coalescing with an adjoining block") \
1645 \
1646 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1647 "CMS: the factor by which to inflate estimated demand of small " \
1648 "block sizes to prevent splitting to supply demand for smaller " \
1649 "blocks") \
1650 \
1651 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1652 "CMS: the factor by which to inflate estimated demand of large " \
1653 "block sizes to prevent splitting to supply demand for smaller " \
1654 "blocks") \
1655 \
1656 product(bool, CMSExtrapolateSweep, false, \
1657 "CMS: cushion for block demand during sweep") \
1658 \
1659 product(uintx, CMS_SweepWeight, 75, \
1660 "Percentage (0-100) used to weight the current sample when " \
1661 "computing exponentially decaying average for inter-sweep " \
1662 "duration") \
1663 \
1664 product(uintx, CMS_SweepPadding, 1, \
1665 "The multiple of deviation from mean to use for buffering " \
1666 "against volatility in inter-sweep duration") \
1667 \
1668 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1669 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1670 "duration exceeds this threshold in milliseconds") \
1671 \
1672 develop(bool, CMSTraceIncrementalMode, false, \
1673 "Trace CMS incremental mode") \
1674 \
1675 develop(bool, CMSTraceIncrementalPacing, false, \
1676 "Trace CMS incremental mode pacing computation") \
1677 \
1678 develop(bool, CMSTraceThreadState, false, \
1679 "Trace the CMS thread state (enable the trace_state() method)") \
1680 \
1681 product(bool, CMSClassUnloadingEnabled, true, \
1682 "Whether class unloading enabled when using CMS GC") \
1683 \
1684 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1685 "When CMS class unloading is enabled, the maximum CMS cycle " \
1686 "count for which classes may not be unloaded") \
1687 \
1688 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1689 "Compact when asked to collect CMS gen with " \
1690 "clear_all_soft_refs()") \
1691 \
1692 product(bool, UseCMSCompactAtFullCollection, true, \
1693 "Use Mark-Sweep-Compact algorithm at full collections") \
1694 \
1695 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1696 "Number of CMS full collection done before compaction if > 0") \
1697 \
1698 develop(intx, CMSDictionaryChoice, 0, \
1699 "Use BinaryTreeDictionary as default in the CMS generation") \
1700 \
1701 product(uintx, CMSIndexedFreeListReplenish, 4, \
1702 "Replenish an indexed free list with this number of chunks") \
1703 \
1704 product(bool, CMSReplenishIntermediate, true, \
1705 "Replenish all intermediate free-list caches") \
1706 \
1707 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1708 "When satisfying batched demand, split blocks from the " \
1709 "IndexedFreeList whose size is a multiple of requested size") \
1710 \
1711 product(bool, CMSLoopWarn, false, \
1712 "Warn in case of excessive CMS looping") \
1713 \
1714 develop(bool, CMSOverflowEarlyRestoration, false, \
1715 "Restore preserved marks early") \
1716 \
1717 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1718 "Size of marking stack") \
1719 \
1720 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1721 "Maximum size of marking stack") \
1722 \
1723 notproduct(bool, CMSMarkStackOverflowALot, false, \
1724 "Simulate frequent marking stack / work queue overflow") \
1725 \
1726 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1727 "An \"interval\" counter that determines how frequently " \
1728 "to simulate overflow; a smaller number increases frequency") \
1729 \
1730 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1731 "(Temporary, subject to experimentation) " \
1732 "Maximum number of abortable preclean iterations, if > 0") \
1733 \
1734 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1735 "(Temporary, subject to experimentation) " \
1736 "Maximum time in abortable preclean (in milliseconds)") \
1737 \
1738 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1739 "(Temporary, subject to experimentation) " \
1740 "Nominal minimum work per abortable preclean iteration") \
1741 \
1742 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1743 "(Temporary, subject to experimentation) " \
1744 "Time that we sleep between iterations when not given " \
1745 "enough work per iteration") \
1746 \
1747 product(uintx, CMSRescanMultiple, 32, \
1748 "Size (in cards) of CMS parallel rescan task") \
1749 \
1750 product(uintx, CMSConcMarkMultiple, 32, \
1751 "Size (in cards) of CMS concurrent MT marking task") \
1752 \
1753 product(bool, CMSAbortSemantics, false, \
1754 "Whether abort-on-overflow semantics is implemented") \
1755 \
1756 product(bool, CMSParallelInitialMarkEnabled, true, \
1757 "Use the parallel initial mark.") \
1758 \
1759 product(bool, CMSParallelRemarkEnabled, true, \
1760 "Whether parallel remark enabled (only if ParNewGC)") \
1761 \
1762 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1763 "Whether parallel remark of survivor space " \
1764 "enabled (effective only if CMSParallelRemarkEnabled)") \
1765 \
1766 product(bool, CMSPLABRecordAlways, true, \
1767 "Always record survivor space PLAB boundaries (effective only " \
1768 "if CMSParallelSurvivorRemarkEnabled)") \
1769 \
1770 product(bool, CMSEdenChunksRecordAlways, true, \
1771 "Always record eden chunks used for the parallel initial mark " \
1772 "or remark of eden") \
1773 \
1774 product(bool, CMSPrintEdenSurvivorChunks, false, \
1775 "Print the eden and the survivor chunks used for the parallel " \
1776 "initial mark or remark of the eden/survivor spaces") \
1777 \
1778 product(bool, CMSConcurrentMTEnabled, true, \
1779 "Whether multi-threaded concurrent work enabled " \
1780 "(effective only if ParNewGC)") \
1781 \
1782 product(bool, CMSPrecleaningEnabled, true, \
1783 "Whether concurrent precleaning enabled") \
1784 \
1785 product(uintx, CMSPrecleanIter, 3, \
1786 "Maximum number of precleaning iteration passes") \
1787 \
1788 product(uintx, CMSPrecleanNumerator, 2, \
1789 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1790 "ratio") \
1791 \
1792 product(uintx, CMSPrecleanDenominator, 3, \
1793 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1794 "ratio") \
1795 \
1796 product(bool, CMSPrecleanRefLists1, true, \
1797 "Preclean ref lists during (initial) preclean phase") \
1798 \
1799 product(bool, CMSPrecleanRefLists2, false, \
1800 "Preclean ref lists during abortable preclean phase") \
1801 \
1802 product(bool, CMSPrecleanSurvivors1, false, \
1803 "Preclean survivors during (initial) preclean phase") \
1804 \
1805 product(bool, CMSPrecleanSurvivors2, true, \
1806 "Preclean survivors during abortable preclean phase") \
1807 \
1808 product(uintx, CMSPrecleanThreshold, 1000, \
1809 "Do not iterate again if number of dirty cards is less than this")\
1810 \
1811 product(bool, CMSCleanOnEnter, true, \
1812 "Clean-on-enter optimization for reducing number of dirty cards") \
1813 \
1814 product(uintx, CMSRemarkVerifyVariant, 1, \
1815 "Choose variant (1,2) of verification following remark") \
1816 \
1817 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1818 "If Eden size is below this, do not try to schedule remark") \
1819 \
1820 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1821 "The Eden occupancy percentage (0-100) at which " \
1822 "to try and schedule remark pause") \
1823 \
1824 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1825 "Start sampling eden top at least before young gen " \
1826 "occupancy reaches 1/<ratio> of the size at which " \
1827 "we plan to schedule remark") \
1828 \
1829 product(uintx, CMSSamplingGrain, 16*K, \
1830 "The minimum distance between eden samples for CMS (see above)") \
1831 \
1832 product(bool, CMSScavengeBeforeRemark, false, \
1833 "Attempt scavenge before the CMS remark step") \
1834 \
1835 develop(bool, CMSTraceSweeper, false, \
1836 "Trace some actions of the CMS sweeper") \
1837 \
1838 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1839 "Don't drain below this size per parallel worker/thief") \
1840 \
1841 manageable(intx, CMSWaitDuration, 2000, \
1842 "Time in milliseconds that CMS thread waits for young GC") \
1843 \
1844 develop(uintx, CMSCheckInterval, 1000, \
1845 "Interval in milliseconds that CMS thread checks if it " \
1846 "should start a collection cycle") \
1847 \
1848 product(bool, CMSYield, true, \
1849 "Yield between steps of CMS") \
1850 \
1851 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1852 "Bitmap operations should process at most this many bits " \
1853 "between yields") \
1854 \
1855 product(bool, CMSDumpAtPromotionFailure, false, \
1856 "Dump useful information about the state of the CMS old " \
1857 "generation upon a promotion failure") \
1858 \
1859 product(bool, CMSPrintChunksInDump, false, \
1860 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1861 "more detailed information about the free chunks") \
1862 \
1863 product(bool, CMSPrintObjectsInDump, false, \
1864 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1865 "more detailed information about the allocated objects") \
1866 \
1867 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1868 "Verify that all references across the FLS boundary " \
1869 "are to valid objects") \
1870 \
1871 diagnostic(bool, FLSVerifyLists, false, \
1872 "Do lots of (expensive) FreeListSpace verification") \
1873 \
1874 diagnostic(bool, FLSVerifyIndexTable, false, \
1875 "Do lots of (expensive) FLS index table verification") \
1876 \
1877 develop(bool, FLSVerifyDictionary, false, \
1878 "Do lots of (expensive) FLS dictionary verification") \
1879 \
1880 develop(bool, VerifyBlockOffsetArray, false, \
1881 "Do (expensive) block offset array verification") \
1882 \
1883 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1884 "Maintain _unallocated_block in BlockOffsetArray " \
1885 "(currently applicable only to CMS collector)") \
1886 \
1887 develop(bool, TraceCMSState, false, \
1888 "Trace the state of the CMS collection") \
1889 \
1890 product(intx, RefDiscoveryPolicy, 0, \
1891 "Select type of reference discovery policy: " \
1892 "reference-based(0) or referent-based(1)") \
1893 \
1894 product(bool, ParallelRefProcEnabled, false, \
1895 "Enable parallel reference processing whenever possible") \
1896 \
1897 product(bool, ParallelRefProcBalancingEnabled, true, \
1898 "Enable balancing of reference processing queues") \
1899 \
1900 product(uintx, CMSTriggerRatio, 80, \
1901 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1902 "allocated before a CMS collection cycle commences") \
1903 \
1904 product(uintx, CMSBootstrapOccupancy, 50, \
1905 "Percentage CMS generation occupancy at which to " \
1906 "initiate CMS collection for bootstrapping collection stats") \
1907 \
1908 product(intx, CMSInitiatingOccupancyFraction, -1, \
1909 "Percentage CMS generation occupancy to start a CMS collection " \
1910 "cycle. A negative value means that CMSTriggerRatio is used") \
1911 \
1912 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1913 "Percentage of the (entire) heap occupancy to start a " \
1914 "concurrent GC cycle. It is used by GCs that trigger a " \
1915 "concurrent GC cycle based on the occupancy of the entire heap, " \
1916 "not just one of the generations (e.g., G1). A value of 0 " \
1917 "denotes 'do constant GC cycles'.") \
1918 \
1919 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1920 "Only use occupancy as a criterion for starting a CMS collection")\
1921 \
1922 product(uintx, CMSIsTooFullPercentage, 98, \
1923 "An absolute ceiling above which CMS will always consider the " \
1924 "unloading of classes when class unloading is enabled") \
1925 \
1926 develop(bool, CMSTestInFreeList, false, \
1927 "Check if the coalesced range is already in the " \
1928 "free lists as claimed") \
1929 \
1930 notproduct(bool, CMSVerifyReturnedBytes, false, \
1931 "Check that all the garbage collected was returned to the " \
1932 "free lists") \
1933 \
1934 notproduct(bool, ScavengeALot, false, \
1935 "Force scavenge at every Nth exit from the runtime system " \
1936 "(N=ScavengeALotInterval)") \
1937 \
1938 develop(bool, FullGCALot, false, \
1939 "Force full gc at every Nth exit from the runtime system " \
1940 "(N=FullGCALotInterval)") \
1941 \
1942 notproduct(bool, GCALotAtAllSafepoints, false, \
1943 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1944 \
1945 product(bool, PrintPromotionFailure, false, \
1946 "Print additional diagnostic information following " \
1947 "promotion failure") \
1948 \
1949 notproduct(bool, PromotionFailureALot, false, \
1950 "Use promotion failure handling on every youngest generation " \
1951 "collection") \
1952 \
1953 develop(uintx, PromotionFailureALotCount, 1000, \
1954 "Number of promotion failures occurring at ParGCAllocBuffer " \
1955 "refill attempts (ParNew) or promotion attempts " \
1956 "(other young collectors)") \
1957 \
1958 develop(uintx, PromotionFailureALotInterval, 5, \
1959 "Total collections between promotion failures alot") \
1960 \
1961 experimental(uintx, WorkStealingSleepMillis, 1, \
1962 "Sleep time when sleep is used for yields") \
1963 \
1964 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1965 "Number of yields before a sleep is done during workstealing") \
1966 \
1967 experimental(uintx, WorkStealingHardSpins, 4096, \
1968 "Number of iterations in a spin loop between checks on " \
1969 "time out of hard spin") \
1970 \
1971 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1972 "Ratio of hard spins to calls to yield") \
1973 \
1974 develop(uintx, ObjArrayMarkingStride, 512, \
1975 "Number of object array elements to push onto the marking stack " \
1976 "before pushing a continuation entry") \
1977 \
1978 develop(bool, MetadataAllocationFailALot, false, \
1979 "Fail metadata allocations at intervals controlled by " \
1980 "MetadataAllocationFailALotInterval") \
1981 \
1982 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1983 "Metadata allocation failure a lot interval") \
1984 \
1985 develop(bool, TraceMetadataChunkAllocation, false, \
1986 "Trace chunk metadata allocations") \
1987 \
1988 product(bool, TraceMetadataHumongousAllocation, false, \
1989 "Trace humongous metadata allocations") \
1990 \
1991 develop(bool, TraceMetavirtualspaceAllocation, false, \
1992 "Trace virtual space metadata allocations") \
1993 \
1994 notproduct(bool, ExecuteInternalVMTests, false, \
1995 "Enable execution of internal VM tests") \
1996 \
1997 notproduct(bool, VerboseInternalVMTests, false, \
1998 "Turn on logging for internal VM tests.") \
1999 \
2000 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2001 \
2002 product_pd(bool, ResizeTLAB, \
2003 "Dynamically resize TLAB size for threads") \
2004 \
2005 product(bool, ZeroTLAB, false, \
2006 "Zero out the newly created TLAB") \
2007 \
2008 product(bool, FastTLABRefill, true, \
2009 "Use fast TLAB refill code") \
2010 \
2011 product(bool, PrintTLAB, false, \
2012 "Print various TLAB related information") \
2013 \
2014 product(bool, TLABStats, true, \
2015 "Provide more detailed and expensive TLAB statistics " \
2016 "(with PrintTLAB)") \
2017 \
2018 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
2019 "Enable LowMemoryProtection")) \
2020 \
2021 product_pd(bool, NeverActAsServerClassMachine, \
2022 "Never act like a server-class machine") \
2023 \
2024 product(bool, AlwaysActAsServerClassMachine, false, \
2025 "Always act like a server-class machine") \
2026 \
2027 product_pd(uint64_t, MaxRAM, \
2028 "Real memory size (in bytes) used to set maximum heap size") \
2029 \
2030 product(uintx, ErgoHeapSizeLimit, 0, \
2031 "Maximum ergonomically set heap size (in bytes); zero means use " \
2032 "MaxRAM / MaxRAMFraction") \
2033 \
2034 product(uintx, MaxRAMFraction, 4, \
2035 "Maximum fraction (1/n) of real memory used for maximum heap " \
2036 "size") \
2037 \
2038 product(uintx, DefaultMaxRAMFraction, 4, \
2039 "Maximum fraction (1/n) of real memory used for maximum heap " \
2040 "size; deprecated: to be renamed to MaxRAMFraction") \
2041 \
2042 product(uintx, MinRAMFraction, 2, \
2043 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
2044 "size on systems with small physical memory size") \
2045 \
2046 product(uintx, InitialRAMFraction, 64, \
2047 "Fraction (1/n) of real memory used for initial heap size") \
2048 \
2049 develop(uintx, MaxVirtMemFraction, 2, \
2050 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2051 "determining maximum heap size") \
2052 \
2053 product(bool, UseAutoGCSelectPolicy, false, \
2054 "Use automatic collection selection policy") \
2055 \
2056 product(uintx, AutoGCSelectPauseMillis, 5000, \
2057 "Automatic GC selection pause threshold in milliseconds") \
2058 \
2059 product(bool, UseAdaptiveSizePolicy, true, \
2060 "Use adaptive generation sizing policies") \
2061 \
2062 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2063 "Use adaptive survivor sizing policies") \
2064 \
2065 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2066 "Use adaptive young-old sizing policies at minor collections") \
2067 \
2068 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2069 "Use adaptive young-old sizing policies at major collections") \
2070 \
2071 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2072 "Include statistics from System.gc() for adaptive size policy") \
2073 \
2074 product(bool, UseAdaptiveGCBoundary, false, \
2075 "Allow young-old boundary to move") \
2076 \
2077 develop(bool, TraceAdaptiveGCBoundary, false, \
2078 "Trace young-old boundary moves") \
2079 \
2080 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2081 "Resize the virtual spaces of the young or old generations") \
2082 \
2083 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2084 "Policy for changing generation size for throughput goals") \
2085 \
2086 product(uintx, AdaptiveSizePausePolicy, 0, \
2087 "Policy for changing generation size for pause goals") \
2088 \
2089 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2090 "Adjust tenured generation to achieve a minor pause goal") \
2091 \
2092 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2093 "Adjust young generation to achieve a major pause goal") \
2094 \
2095 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2096 "Number of steps where heuristics is used before data is used") \
2097 \
2098 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2099 "Number of collections before the adaptive sizing is started") \
2100 \
2101 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2102 "Collection interval for printing information; zero means never") \
2103 \
2104 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2105 "Use adaptive minimum footprint as a goal") \
2106 \
2107 product(uintx, AdaptiveSizePolicyWeight, 10, \
2108 "Weight given to exponential resizing, between 0 and 100") \
2109 \
2110 product(uintx, AdaptiveTimeWeight, 25, \
2111 "Weight given to time in adaptive policy, between 0 and 100") \
2112 \
2113 product(uintx, PausePadding, 1, \
2114 "How much buffer to keep for pause time") \
2115 \
2116 product(uintx, PromotedPadding, 3, \
2117 "How much buffer to keep for promotion failure") \
2118 \
2119 product(uintx, SurvivorPadding, 3, \
2120 "How much buffer to keep for survivor overflow") \
2121 \
2122 product(uintx, ThresholdTolerance, 10, \
2123 "Allowed collection cost difference between generations") \
2124 \
2125 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2126 "If collection costs are within margin, reduce both by full " \
2127 "delta") \
2128 \
2129 product(uintx, YoungGenerationSizeIncrement, 20, \
2130 "Adaptive size percentage change in young generation") \
2131 \
2132 product(uintx, YoungGenerationSizeSupplement, 80, \
2133 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2134 \
2135 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2136 "Decay factor to YoungedGenerationSizeSupplement") \
2137 \
2138 product(uintx, TenuredGenerationSizeIncrement, 20, \
2139 "Adaptive size percentage change in tenured generation") \
2140 \
2141 product(uintx, TenuredGenerationSizeSupplement, 80, \
2142 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2143 \
2144 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2145 "Decay factor to TenuredGenerationSizeIncrement") \
2146 \
2147 product(uintx, MaxGCPauseMillis, max_uintx, \
2148 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2149 "or (G1 Only) the maximum GC time per MMU time slice") \
2150 \
2151 product(uintx, GCPauseIntervalMillis, 0, \
2152 "Time slice for MMU specification") \
2153 \
2154 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2155 "Adaptive size policy maximum GC minor pause time goal " \
2156 "in millisecond") \
2157 \
2158 product(uintx, GCTimeRatio, 99, \
2159 "Adaptive size policy application time to GC time ratio") \
2160 \
2161 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2162 "Adaptive size scale down factor for shrinking") \
2163 \
2164 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2165 "Adaptive size decays the major cost for long major intervals") \
2166 \
2167 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2168 "Time scale over which major costs decay") \
2169 \
2170 product(uintx, MinSurvivorRatio, 3, \
2171 "Minimum ratio of young generation/survivor space size") \
2172 \
2173 product(uintx, InitialSurvivorRatio, 8, \
2174 "Initial ratio of young generation/survivor space size") \
2175 \
2176 product(uintx, BaseFootPrintEstimate, 256*M, \
2177 "Estimate of footprint other than Java Heap") \
2178 \
2179 product(bool, UseGCOverheadLimit, true, \
2180 "Use policy to limit of proportion of time spent in GC " \
2181 "before an OutOfMemory error is thrown") \
2182 \
2183 product(uintx, GCTimeLimit, 98, \
2184 "Limit of the proportion of time spent in GC before " \
2185 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2186 \
2187 product(uintx, GCHeapFreeLimit, 2, \
2188 "Minimum percentage of free space after a full GC before an " \
2189 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2190 \
2191 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2192 "Number of consecutive collections before gc time limit fires") \
2193 \
2194 product(bool, PrintAdaptiveSizePolicy, false, \
2195 "Print information about AdaptiveSizePolicy") \
2196 \
2197 product(intx, PrefetchCopyIntervalInBytes, -1, \
2198 "How far ahead to prefetch destination area (<= 0 means off)") \
2199 \
2200 product(intx, PrefetchScanIntervalInBytes, -1, \
2201 "How far ahead to prefetch scan area (<= 0 means off)") \
2202 \
2203 product(intx, PrefetchFieldsAhead, -1, \
2204 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2205 \
2206 diagnostic(bool, VerifySilently, false, \
2207 "Do not print the verification progress") \
2208 \
2209 diagnostic(bool, VerifyDuringStartup, false, \
2210 "Verify memory system before executing any Java code " \
2211 "during VM initialization") \
2212 \
2213 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2214 "Verify system before exiting") \
2215 \
2216 diagnostic(bool, VerifyBeforeGC, false, \
2217 "Verify memory system before GC") \
2218 \
2219 diagnostic(bool, VerifyAfterGC, false, \
2220 "Verify memory system after GC") \
2221 \
2222 diagnostic(bool, VerifyDuringGC, false, \
2223 "Verify memory system during GC (between phases)") \
2224 \
2225 diagnostic(bool, GCParallelVerificationEnabled, true, \
2226 "Enable parallel memory system verification") \
2227 \
2228 diagnostic(bool, DeferInitialCardMark, false, \
2229 "When +ReduceInitialCardMarks, explicitly defer any that " \
2230 "may arise from new_pre_store_barrier") \
2231 \
2232 diagnostic(bool, VerifyRememberedSets, false, \
2233 "Verify GC remembered sets") \
2234 \
2235 diagnostic(bool, VerifyObjectStartArray, true, \
2236 "Verify GC object start array if verify before/after") \
2237 \
2238 product(bool, DisableExplicitGC, false, \
2239 "Ignore calls to System.gc()") \
2240 \
2241 notproduct(bool, CheckMemoryInitialization, false, \
2242 "Check memory initialization") \
2243 \
2244 product(bool, CollectGen0First, false, \
2245 "Collect youngest generation before each full GC") \
2246 \
2247 diagnostic(bool, BindCMSThreadToCPU, false, \
2248 "Bind CMS Thread to CPU if possible") \
2249 \
2250 diagnostic(uintx, CPUForCMSThread, 0, \
2251 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2252 \
2253 product(bool, BindGCTaskThreadsToCPUs, false, \
2254 "Bind GCTaskThreads to CPUs if possible") \
2255 \
2256 product(bool, UseGCTaskAffinity, false, \
2257 "Use worker affinity when asking for GCTasks") \
2258 \
2259 product(uintx, ProcessDistributionStride, 4, \
2260 "Stride through processors when distributing processes") \
2261 \
2262 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2263 "Number of times the coordinator GC thread will sleep while " \
2264 "yielding before giving up and resuming GC") \
2265 \
2266 product(uintx, CMSYieldSleepCount, 0, \
2267 "Number of times a GC thread (minus the coordinator) " \
2268 "will sleep while yielding before giving up and resuming GC") \
2269 \
2270 /* gc tracing */ \
2271 manageable(bool, PrintGC, false, \
2272 "Print message at garbage collection") \
2273 \
2274 manageable(bool, PrintGCDetails, false, \
2275 "Print more details at garbage collection") \
2276 \
2277 manageable(bool, PrintGCDateStamps, false, \
2278 "Print date stamps at garbage collection") \
2279 \
2280 manageable(bool, PrintGCTimeStamps, false, \
2281 "Print timestamps at garbage collection") \
2282 \
2283 product(bool, PrintGCTaskTimeStamps, false, \
2284 "Print timestamps for individual gc worker thread tasks") \
2285 \
2286 develop(intx, ConcGCYieldTimeout, 0, \
2287 "If non-zero, assert that GC threads yield within this " \
2288 "number of milliseconds") \
2289 \
2290 notproduct(bool, TraceMarkSweep, false, \
2291 "Trace mark sweep") \
2292 \
2293 product(bool, PrintReferenceGC, false, \
2294 "Print times spent handling reference objects during GC " \
2295 "(enabled only when PrintGCDetails)") \
2296 \
2297 develop(bool, TraceReferenceGC, false, \
2298 "Trace handling of soft/weak/final/phantom references") \
2299 \
2300 develop(bool, TraceFinalizerRegistration, false, \
2301 "Trace registration of final references") \
2302 \
2303 notproduct(bool, TraceScavenge, false, \
2304 "Trace scavenge") \
2305 \
2306 product_rw(bool, TraceClassLoading, false, \
2307 "Trace all classes loaded") \
2308 \
2309 product(bool, TraceClassLoadingPreorder, false, \
2310 "Trace all classes loaded in order referenced (not loaded)") \
2311 \
2312 product_rw(bool, TraceClassUnloading, false, \
2313 "Trace unloading of classes") \
2314 \
2315 product_rw(bool, TraceLoaderConstraints, false, \
2316 "Trace loader constraints") \
2317 \
2318 develop(bool, TraceClassLoaderData, false, \
2319 "Trace class loader loader_data lifetime") \
2320 \
2321 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2322 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2323 "Initial size of the boot class loader data metaspace") \
2324 \
2325 product(bool, TraceGen0Time, false, \
2326 "Trace accumulated time for Gen 0 collection") \
2327 \
2328 product(bool, TraceGen1Time, false, \
2329 "Trace accumulated time for Gen 1 collection") \
2330 \
2331 product(bool, PrintTenuringDistribution, false, \
2332 "Print tenuring age information") \
2333 \
2334 product_rw(bool, PrintHeapAtGC, false, \
2335 "Print heap layout before and after each GC") \
2336 \
2337 product_rw(bool, PrintHeapAtGCExtended, false, \
2338 "Print extended information about the layout of the heap " \
2339 "when -XX:+PrintHeapAtGC is set") \
2340 \
2341 product(bool, PrintHeapAtSIGBREAK, true, \
2342 "Print heap layout in response to SIGBREAK") \
2343 \
2344 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2345 "Print a class histogram before any major stop-world GC") \
2346 \
2347 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2348 "Print a class histogram after any major stop-world GC") \
2349 \
2350 manageable(bool, PrintClassHistogram, false, \
2351 "Print a histogram of class instances") \
2352 \
2353 develop(bool, TraceWorkGang, false, \
2354 "Trace activities of work gangs") \
2355 \
2356 product(bool, TraceParallelOldGCTasks, false, \
2357 "Trace multithreaded GC activity") \
2358 \
2359 develop(bool, TraceBlockOffsetTable, false, \
2360 "Print BlockOffsetTable maps") \
2361 \
2362 develop(bool, TraceCardTableModRefBS, false, \
2363 "Print CardTableModRefBS maps") \
2364 \
2365 develop(bool, TraceGCTaskManager, false, \
2366 "Trace actions of the GC task manager") \
2367 \
2368 develop(bool, TraceGCTaskQueue, false, \
2369 "Trace actions of the GC task queues") \
2370 \
2371 diagnostic(bool, TraceGCTaskThread, false, \
2372 "Trace actions of the GC task threads") \
2373 \
2374 product(bool, PrintParallelOldGCPhaseTimes, false, \
2375 "Print the time taken by each phase in ParallelOldGC " \
2376 "(PrintGCDetails must also be enabled)") \
2377 \
2378 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2379 "Trace marking phase in ParallelOldGC") \
2380 \
2381 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2382 "Trace summary phase in ParallelOldGC") \
2383 \
2384 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2385 "Trace compaction phase in ParallelOldGC") \
2386 \
2387 develop(bool, TraceParallelOldGCDensePrefix, false, \
2388 "Trace dense prefix computation for ParallelOldGC") \
2389 \
2390 develop(bool, IgnoreLibthreadGPFault, false, \
2391 "Suppress workaround for libthread GP fault") \
2392 \
2393 product(bool, PrintJNIGCStalls, false, \
2394 "Print diagnostic message when GC is stalled " \
2395 "by JNI critical section") \
2396 \
2397 experimental(double, ObjectCountCutOffPercent, 0.5, \
2398 "The percentage of the used heap that the instances of a class " \
2399 "must occupy for the class to generate a trace event") \
2400 \
2401 /* GC log rotation setting */ \
2402 \
2403 product(bool, UseGCLogFileRotation, false, \
2404 "Rotate gclog files (for long running applications). It requires "\
2405 "-Xloggc:<filename>") \
2406 \
2407 product(uintx, NumberOfGCLogFiles, 0, \
2408 "Number of gclog files in rotation " \
2409 "(default: 0, no rotation)") \
2410 \
2411 product(uintx, GCLogFileSize, 0, \
2412 "GC log file size (default: 0 bytes, no rotation). " \
2413 "It requires UseGCLogFileRotation") \
2414 \
2415 /* JVMTI heap profiling */ \
2416 \
2417 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2418 "Trace JVMTI object tagging calls") \
2419 \
2420 diagnostic(bool, VerifyBeforeIteration, false, \
2421 "Verify memory system before JVMTI iteration") \
2422 \
2423 /* compiler interface */ \
2424 \
2425 develop(bool, CIPrintCompilerName, false, \
2426 "when CIPrint is active, print the name of the active compiler") \
2427 \
2428 develop(bool, CIPrintCompileQueue, false, \
2429 "display the contents of the compile queue whenever a " \
2430 "compilation is enqueued") \
2431 \
2432 develop(bool, CIPrintRequests, false, \
2433 "display every request for compilation") \
2434 \
2435 product(bool, CITime, false, \
2436 "collect timing information for compilation") \
2437 \
2438 develop(bool, CITimeEach, false, \
2439 "display timing information after each successful compilation") \
2440 \
2441 develop(bool, CICountOSR, false, \
2442 "use a separate counter when assigning ids to osr compilations") \
2443 \
2444 develop(bool, CICompileNatives, true, \
2445 "compile native methods if supported by the compiler") \
2446 \
2447 develop_pd(bool, CICompileOSR, \
2448 "compile on stack replacement methods if supported by the " \
2449 "compiler") \
2450 \
2451 develop(bool, CIPrintMethodCodes, false, \
2452 "print method bytecodes of the compiled code") \
2453 \
2454 develop(bool, CIPrintTypeFlow, false, \
2455 "print the results of ciTypeFlow analysis") \
2456 \
2457 develop(bool, CITraceTypeFlow, false, \
2458 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2459 \
2460 develop(intx, OSROnlyBCI, -1, \
2461 "OSR only at this bci. Negative values mean exclude that bci") \
2462 \
2463 /* compiler */ \
2464 \
2465 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2466 "Number of compiler threads to run") \
2467 \
2468 product(intx, CompilationPolicyChoice, 0, \
2469 "which compilation policy (0/1)") \
2470 \
2471 develop(bool, UseStackBanging, true, \
2472 "use stack banging for stack overflow checks (required for " \
2473 "proper StackOverflow handling; disable only to measure cost " \
2474 "of stackbanging)") \
2475 \
2476 develop(bool, UseStrictFP, true, \
2477 "use strict fp if modifier strictfp is set") \
2478 \
2479 develop(bool, GenerateSynchronizationCode, true, \
2480 "generate locking/unlocking code for synchronized methods and " \
2481 "monitors") \
2482 \
2483 develop(bool, GenerateCompilerNullChecks, true, \
2484 "Generate explicit null checks for loads/stores/calls") \
2485 \
2486 develop(bool, GenerateRangeChecks, true, \
2487 "Generate range checks for array accesses") \
2488 \
2489 develop_pd(bool, ImplicitNullChecks, \
2490 "Generate code for implicit null checks") \
2491 \
2492 product(bool, PrintSafepointStatistics, false, \
2493 "Print statistics about safepoint synchronization") \
2494 \
2495 product(intx, PrintSafepointStatisticsCount, 300, \
2496 "Total number of safepoint statistics collected " \
2497 "before printing them out") \
2498 \
2499 product(intx, PrintSafepointStatisticsTimeout, -1, \
2500 "Print safepoint statistics only when safepoint takes " \
2501 "more than PrintSafepointSatisticsTimeout in millis") \
2502 \
2503 product(bool, TraceSafepointCleanupTime, false, \
2504 "Print the break down of clean up tasks performed during " \
2505 "safepoint") \
2506 \
2507 product(bool, Inline, true, \
2508 "Enable inlining") \
2509 \
2510 product(bool, ClipInlining, true, \
2511 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2512 \
2513 develop(bool, UseCHA, true, \
2514 "Enable CHA") \
2515 \
2516 product(bool, UseTypeProfile, true, \
2517 "Check interpreter profile for historically monomorphic calls") \
2518 \
2519 notproduct(bool, TimeCompiler, false, \
2520 "Time the compiler") \
2521 \
2522 diagnostic(bool, PrintInlining, false, \
2523 "Print inlining optimizations") \
2524 \
2525 product(bool, UsePopCountInstruction, false, \
2526 "Use population count instruction") \
2527 \
2528 develop(bool, EagerInitialization, false, \
2529 "Eagerly initialize classes if possible") \
2530 \
2531 develop(bool, TraceMethodReplacement, false, \
2532 "Print when methods are replaced do to recompilation") \
2533 \
2534 develop(bool, PrintMethodFlushing, false, \
2535 "Print the nmethods being flushed") \
2536 \
2537 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2538 "print statistics about method flushing") \
2539 \
2540 develop(bool, UseRelocIndex, false, \
2541 "Use an index to speed random access to relocations") \
2542 \
2543 develop(bool, StressCodeBuffers, false, \
2544 "Exercise code buffer expansion and other rare state changes") \
2545 \
2546 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2547 "Generate extra debugging information for non-safepoints in " \
2548 "nmethods") \
2549 \
2550 product(bool, PrintVMOptions, false, \
2551 "Print flags that appeared on the command line") \
2552 \
2553 product(bool, IgnoreUnrecognizedVMOptions, false, \
2554 "Ignore unrecognized VM options") \
2555 \
2556 product(bool, PrintCommandLineFlags, false, \
2557 "Print flags specified on command line or set by ergonomics") \
2558 \
2559 product(bool, PrintFlagsInitial, false, \
2560 "Print all VM flags before argument processing and exit VM") \
2561 \
2562 product(bool, PrintFlagsFinal, false, \
2563 "Print all VM flags after argument and ergonomic processing") \
2564 \
2565 notproduct(bool, PrintFlagsWithComments, false, \
2566 "Print all VM flags with default values and descriptions and " \
2567 "exit") \
2568 \
2569 diagnostic(bool, SerializeVMOutput, true, \
2570 "Use a mutex to serialize output to tty and LogFile") \
2571 \
2572 diagnostic(bool, DisplayVMOutput, true, \
2573 "Display all VM output on the tty, independently of LogVMOutput") \
2574 \
2575 diagnostic(bool, LogVMOutput, false, \
2576 "Save VM output to LogFile") \
2577 \
2578 diagnostic(ccstr, LogFile, NULL, \
2579 "If LogVMOutput or LogCompilation is on, save VM output to " \
2580 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2581 \
2582 product(ccstr, ErrorFile, NULL, \
2583 "If an error occurs, save the error data to this file " \
2584 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2585 \
2586 product(bool, DisplayVMOutputToStderr, false, \
2587 "If DisplayVMOutput is true, display all VM output to stderr") \
2588 \
2589 product(bool, DisplayVMOutputToStdout, false, \
2590 "If DisplayVMOutput is true, display all VM output to stdout") \
2591 \
2592 product(bool, UseHeavyMonitors, false, \
2593 "use heavyweight instead of lightweight Java monitors") \
2594 \
2595 product(bool, PrintStringTableStatistics, false, \
2596 "print statistics about the StringTable and SymbolTable") \
2597 \
2598 diagnostic(bool, VerifyStringTableAtExit, false, \
2599 "verify StringTable contents at exit") \
2600 \
2601 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2602 "print histogram of the symbol table") \
2603 \
2604 notproduct(bool, ExitVMOnVerifyError, false, \
2605 "standard exit from VM if bytecode verify error " \
2606 "(only in debug mode)") \
2607 \
2608 notproduct(ccstr, AbortVMOnException, NULL, \
2609 "Call fatal if this exception is thrown. Example: " \
2610 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2611 \
2612 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2613 "Call fatal if the exception pointed by AbortVMOnException " \
2614 "has this message") \
2615 \
2616 develop(bool, DebugVtables, false, \
2617 "add debugging code to vtable dispatch") \
2618 \
2619 develop(bool, PrintVtables, false, \
2620 "print vtables when printing klass") \
2621 \
2622 notproduct(bool, PrintVtableStats, false, \
2623 "print vtables stats at end of run") \
2624 \
2625 develop(bool, TraceCreateZombies, false, \
2626 "trace creation of zombie nmethods") \
2627 \
2628 notproduct(bool, IgnoreLockingAssertions, false, \
2629 "disable locking assertions (for speed)") \
2630 \
2631 product(bool, RangeCheckElimination, true, \
2632 "Eliminate range checks") \
2633 \
2634 develop_pd(bool, UncommonNullCast, \
2635 "track occurrences of null in casts; adjust compiler tactics") \
2636 \
2637 develop(bool, TypeProfileCasts, true, \
2638 "treat casts like calls for purposes of type profiling") \
2639 \
2640 develop(bool, DelayCompilationDuringStartup, true, \
2641 "Delay invoking the compiler until main application class is " \
2642 "loaded") \
2643 \
2644 develop(bool, CompileTheWorld, false, \
2645 "Compile all methods in all classes in bootstrap class path " \
2646 "(stress test)") \
2647 \
2648 develop(bool, CompileTheWorldPreloadClasses, true, \
2649 "Preload all classes used by a class before start loading") \
2650 \
2651 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2652 "Force a safepoint every n compiles so sweeper can keep up") \
2653 \
2654 develop(bool, FillDelaySlots, true, \
2655 "Fill delay slots (on SPARC only)") \
2656 \
2657 develop(bool, TimeLivenessAnalysis, false, \
2658 "Time computation of bytecode liveness analysis") \
2659 \
2660 develop(bool, TraceLivenessGen, false, \
2661 "Trace the generation of liveness analysis information") \
2662 \
2663 notproduct(bool, TraceLivenessQuery, false, \
2664 "Trace queries of liveness analysis information") \
2665 \
2666 notproduct(bool, CollectIndexSetStatistics, false, \
2667 "Collect information about IndexSets") \
2668 \
2669 develop(bool, UseLoopSafepoints, true, \
2670 "Generate Safepoint nodes in every loop") \
2671 \
2672 develop(intx, FastAllocateSizeLimit, 128*K, \
2673 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2674 "Inline allocations larger than this in doublewords must go slow")\
2675 \
2676 product(bool, AggressiveOpts, false, \
2677 "Enable aggressive optimizations - see arguments.cpp") \
2678 \
2679 product_pd(uintx, TypeProfileLevel, \
2680 "=XYZ, with Z: Type profiling of arguments at call; " \
2681 "Y: Type profiling of return value at call; " \
2682 "X: Type profiling of parameters to methods; " \
2683 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2684 \
2685 product(intx, TypeProfileArgsLimit, 2, \
2686 "max number of call arguments to consider for type profiling") \
2687 \
2688 product(intx, TypeProfileParmsLimit, 2, \
2689 "max number of incoming parameters to consider for type profiling"\
2690 ", -1 for all") \
2691 \
2692 /* statistics */ \
2693 develop(bool, CountCompiledCalls, false, \
2694 "Count method invocations") \
2695 \
2696 notproduct(bool, CountRuntimeCalls, false, \
2697 "Count VM runtime calls") \
2698 \
2699 develop(bool, CountJNICalls, false, \
2700 "Count jni method invocations") \
2701 \
2702 notproduct(bool, CountJVMCalls, false, \
2703 "Count jvm method invocations") \
2704 \
2705 notproduct(bool, CountRemovableExceptions, false, \
2706 "Count exceptions that could be replaced by branches due to " \
2707 "inlining") \
2708 \
2709 notproduct(bool, ICMissHistogram, false, \
2710 "Produce histogram of IC misses") \
2711 \
2712 notproduct(bool, PrintClassStatistics, false, \
2713 "Print class statistics at end of run") \
2714 \
2715 notproduct(bool, PrintMethodStatistics, false, \
2716 "Print method statistics at end of run") \
2717 \
2718 /* interpreter */ \
2719 develop(bool, ClearInterpreterLocals, false, \
2720 "Always clear local variables of interpreter activations upon " \
2721 "entry") \
2722 \
2723 product_pd(bool, RewriteBytecodes, \
2724 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2725 \
2726 product_pd(bool, RewriteFrequentPairs, \
2727 "Rewrite frequently used bytecode pairs into a single bytecode") \
2728 \
2729 diagnostic(bool, PrintInterpreter, false, \
2730 "Print the generated interpreter code") \
2731 \
2732 product(bool, UseInterpreter, true, \
2733 "Use interpreter for non-compiled methods") \
2734 \
2735 develop(bool, UseFastSignatureHandlers, true, \
2736 "Use fast signature handlers for native calls") \
2737 \
2738 product(bool, UseLoopCounter, true, \
2739 "Increment invocation counter on backward branch") \
2740 \
2741 product(bool, UseFastEmptyMethods, true, \
2742 "Use fast method entry code for empty methods") \
2743 \
2744 product(bool, UseFastAccessorMethods, true, \
2745 "Use fast method entry code for accessor methods") \
2746 \
2747 product_pd(bool, UseOnStackReplacement, \
2748 "Use on stack replacement, calls runtime if invoc. counter " \
2749 "overflows in loop") \
2750 \
2751 notproduct(bool, TraceOnStackReplacement, false, \
2752 "Trace on stack replacement") \
2753 \
2754 product_pd(bool, PreferInterpreterNativeStubs, \
2755 "Use always interpreter stubs for native methods invoked via " \
2756 "interpreter") \
2757 \
2758 develop(bool, CountBytecodes, false, \
2759 "Count number of bytecodes executed") \
2760 \
2761 develop(bool, PrintBytecodeHistogram, false, \
2762 "Print histogram of the executed bytecodes") \
2763 \
2764 develop(bool, PrintBytecodePairHistogram, false, \
2765 "Print histogram of the executed bytecode pairs") \
2766 \
2767 diagnostic(bool, PrintSignatureHandlers, false, \
2768 "Print code generated for native method signature handlers") \
2769 \
2770 develop(bool, VerifyOops, false, \
2771 "Do plausibility checks for oops") \
2772 \
2773 develop(bool, CheckUnhandledOops, false, \
2774 "Check for unhandled oops in VM code") \
2775 \
2776 develop(bool, VerifyJNIFields, trueInDebug, \
2777 "Verify jfieldIDs for instance fields") \
2778 \
2779 notproduct(bool, VerifyJNIEnvThread, false, \
2780 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2781 "from JNI") \
2782 \
2783 develop(bool, VerifyFPU, false, \
2784 "Verify FPU state (check for NaN's, etc.)") \
2785 \
2786 develop(bool, VerifyThread, false, \
2787 "Watch the thread register for corruption (SPARC only)") \
2788 \
2789 develop(bool, VerifyActivationFrameSize, false, \
2790 "Verify that activation frame didn't become smaller than its " \
2791 "minimal size") \
2792 \
2793 develop(bool, TraceFrequencyInlining, false, \
2794 "Trace frequency based inlining") \
2795 \
2796 develop_pd(bool, InlineIntrinsics, \
2797 "Inline intrinsics that can be statically resolved") \
2798 \
2799 product_pd(bool, ProfileInterpreter, \
2800 "Profile at the bytecode level during interpretation") \
2801 \
2802 develop_pd(bool, ProfileTraps, \
2803 "Profile deoptimization traps at the bytecode level") \
2804 \
2805 product(intx, ProfileMaturityPercentage, 20, \
2806 "number of method invocations/branches (expressed as % of " \
2807 "CompileThreshold) before using the method's profile") \
2808 \
2809 develop(bool, PrintMethodData, false, \
2810 "Print the results of +ProfileInterpreter at end of run") \
2811 \
2812 develop(bool, VerifyDataPointer, trueInDebug, \
2813 "Verify the method data pointer during interpreter profiling") \
2814 \
2815 develop(bool, VerifyCompiledCode, false, \
2816 "Include miscellaneous runtime verifications in nmethod code; " \
2817 "default off because it disturbs nmethod size heuristics") \
2818 \
2819 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2820 "Manually make GC thread crash then dump java stack trace; " \
2821 "Test only") \
2822 \
2823 /* compilation */ \
2824 product(bool, UseCompiler, true, \
2825 "Use Just-In-Time compilation") \
2826 \
2827 develop(bool, TraceCompilationPolicy, false, \
2828 "Trace compilation policy") \
2829 \
2830 develop(bool, TimeCompilationPolicy, false, \
2831 "Time the compilation policy") \
2832 \
2833 product(bool, UseCounterDecay, true, \
2834 "Adjust recompilation counters") \
2835 \
2836 develop(intx, CounterHalfLifeTime, 30, \
2837 "Half-life time of invocation counters (in seconds)") \
2838 \
2839 develop(intx, CounterDecayMinIntervalLength, 500, \
2840 "The minimum interval (in milliseconds) between invocation of " \
2841 "CounterDecay") \
2842 \
2843 product(bool, AlwaysCompileLoopMethods, false, \
2844 "When using recompilation, never interpret methods " \
2845 "containing loops") \
2846 \
2847 product(bool, DontCompileHugeMethods, true, \
2848 "Do not compile methods > HugeMethodLimit") \
2849 \
2850 /* Bytecode escape analysis estimation. */ \
2851 product(bool, EstimateArgEscape, true, \
2852 "Analyze bytecodes to estimate escape state of arguments") \
2853 \
2854 product(intx, BCEATraceLevel, 0, \
2855 "How much tracing to do of bytecode escape analysis estimates") \
2856 \
2857 product(intx, MaxBCEAEstimateLevel, 5, \
2858 "Maximum number of nested calls that are analyzed by BC EA") \
2859 \
2860 product(intx, MaxBCEAEstimateSize, 150, \
2861 "Maximum bytecode size of a method to be analyzed by BC EA") \
2862 \
2863 product(intx, AllocatePrefetchStyle, 1, \
2864 "0 = no prefetch, " \
2865 "1 = prefetch instructions for each allocation, " \
2866 "2 = use TLAB watermark to gate allocation prefetch, " \
2867 "3 = use BIS instruction on Sparc for allocation prefetch") \
2868 \
2869 product(intx, AllocatePrefetchDistance, -1, \
2870 "Distance to prefetch ahead of allocation pointer") \
2871 \
2872 product(intx, AllocatePrefetchLines, 3, \
2873 "Number of lines to prefetch ahead of array allocation pointer") \
2874 \
2875 product(intx, AllocateInstancePrefetchLines, 1, \
2876 "Number of lines to prefetch ahead of instance allocation " \
2877 "pointer") \
2878 \
2879 product(intx, AllocatePrefetchStepSize, 16, \
2880 "Step size in bytes of sequential prefetch instructions") \
2881 \
2882 product(intx, AllocatePrefetchInstr, 0, \
2883 "Prefetch instruction to prefetch ahead of allocation pointer") \
2884 \
2885 /* deoptimization */ \
2886 develop(bool, TraceDeoptimization, false, \
2887 "Trace deoptimization") \
2888 \
2889 develop(bool, DebugDeoptimization, false, \
2890 "Tracing various information while debugging deoptimization") \
2891 \
2892 product(intx, SelfDestructTimer, 0, \
2893 "Will cause VM to terminate after a given time (in minutes) " \
2894 "(0 means off)") \
2895 \
2896 product(intx, MaxJavaStackTraceDepth, 1024, \
2897 "The maximum number of lines in the stack trace for Java " \
2898 "exceptions (0 means all)") \
2899 \
2900 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2901 "Guarantee a safepoint (at least) every so many milliseconds " \
2902 "(0 means none)")) \
2903 \
2904 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2905 "Guarantee a safepoint (at least) every so many milliseconds " \
2906 "(0 means none)")) \
2907 \
2908 product(intx, SafepointTimeoutDelay, 10000, \
2909 "Delay in milliseconds for option SafepointTimeout") \
2910 \
2911 product(intx, NmethodSweepFraction, 16, \
2912 "Number of invocations of sweeper to cover all nmethods") \
2913 \
2914 product(intx, NmethodSweepCheckInterval, 5, \
2915 "Compilers wake up every n seconds to possibly sweep nmethods") \
2916 \
2917 product(intx, NmethodSweepActivity, 10, \
2918 "Removes cold nmethods from code cache if > 0. Higher values " \
2919 "result in more aggressive sweeping") \
2920 \
2921 notproduct(bool, LogSweeper, false, \
2922 "Keep a ring buffer of sweeper activity") \
2923 \
2924 notproduct(intx, SweeperLogEntries, 1024, \
2925 "Number of records in the ring buffer of sweeper activity") \
2926 \
2927 notproduct(intx, MemProfilingInterval, 500, \
2928 "Time between each invocation of the MemProfiler") \
2929 \
2930 develop(intx, MallocCatchPtr, -1, \
2931 "Hit breakpoint when mallocing/freeing this pointer") \
2932 \
2933 notproduct(intx, AssertRepeat, 1, \
2934 "number of times to evaluate expression in assert " \
2935 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2936 \
2937 notproduct(ccstrlist, SuppressErrorAt, "", \
2938 "List of assertions (file:line) to muzzle") \
2939 \
2940 notproduct(uintx, HandleAllocationLimit, 1024, \
2941 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2942 "is used") \
2943 \
2944 develop(uintx, TotalHandleAllocationLimit, 1024, \
2945 "Threshold for total handle allocation when " \
2946 "+TraceHandleAllocation is used") \
2947 \
2948 develop(intx, StackPrintLimit, 100, \
2949 "number of stack frames to print in VM-level stack dump") \
2950 \
2951 notproduct(intx, MaxElementPrintSize, 256, \
2952 "maximum number of elements to print") \
2953 \
2954 notproduct(intx, MaxSubklassPrintSize, 4, \
2955 "maximum number of subklasses to print when printing klass") \
2956 \
2957 product(intx, MaxInlineLevel, 9, \
2958 "maximum number of nested calls that are inlined") \
2959 \
2960 product(intx, MaxRecursiveInlineLevel, 1, \
2961 "maximum number of nested recursive calls that are inlined") \
2962 \
2963 develop(intx, MaxForceInlineLevel, 100, \
2964 "maximum number of nested @ForceInline calls that are inlined") \
2965 \
2966 product_pd(intx, InlineSmallCode, \
2967 "Only inline already compiled methods if their code size is " \
2968 "less than this") \
2969 \
2970 product(intx, MaxInlineSize, 35, \
2971 "The maximum bytecode size of a method to be inlined") \
2972 \
2973 product_pd(intx, FreqInlineSize, \
2974 "The maximum bytecode size of a frequent method to be inlined") \
2975 \
2976 product(intx, MaxTrivialSize, 6, \
2977 "The maximum bytecode size of a trivial method to be inlined") \
2978 \
2979 product(intx, MinInliningThreshold, 250, \
2980 "The minimum invocation count a method needs to have to be " \
2981 "inlined") \
2982 \
2983 develop(intx, MethodHistogramCutoff, 100, \
2984 "The cutoff value for method invocation histogram (+CountCalls)") \
2985 \
2986 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2987 "Number of interpreted methods to show in profile") \
2988 \
2989 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2990 "Number of compiled methods to show in profile") \
2991 \
2992 develop(intx, ProfilerNumberOfStubMethods, 25, \
2993 "Number of stub methods to show in profile") \
2994 \
2995 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2996 "Number of runtime stub nodes to show in profile") \
2997 \
2998 product(intx, ProfileIntervalsTicks, 100, \
2999 "Number of ticks between printing of interval profile " \
3000 "(+ProfileIntervals)") \
3001 \
3002 notproduct(intx, ScavengeALotInterval, 1, \
3003 "Interval between which scavenge will occur with +ScavengeALot") \
3004 \
3005 notproduct(intx, FullGCALotInterval, 1, \
3006 "Interval between which full gc will occur with +FullGCALot") \
3007 \
3008 notproduct(intx, FullGCALotStart, 0, \
3009 "For which invocation to start FullGCAlot") \
3010 \
3011 notproduct(intx, FullGCALotDummies, 32*K, \
3012 "Dummy object allocated with +FullGCALot, forcing all objects " \
3013 "to move") \
3014 \
3015 develop(intx, DontYieldALotInterval, 10, \
3016 "Interval between which yields will be dropped (milliseconds)") \
3017 \
3018 develop(intx, MinSleepInterval, 1, \
3019 "Minimum sleep() interval (milliseconds) when " \
3020 "ConvertSleepToYield is off (used for Solaris)") \
3021 \
3022 develop(intx, ProfilerPCTickThreshold, 15, \
3023 "Number of ticks in a PC buckets to be a hotspot") \
3024 \
3025 notproduct(intx, DeoptimizeALotInterval, 5, \
3026 "Number of exits until DeoptimizeALot kicks in") \
3027 \
3028 notproduct(intx, ZombieALotInterval, 5, \
3029 "Number of exits until ZombieALot kicks in") \
3030 \
3031 diagnostic(intx, MallocVerifyInterval, 0, \
3032 "If non-zero, verify C heap after every N calls to " \
3033 "malloc/realloc/free") \
3034 \
3035 diagnostic(intx, MallocVerifyStart, 0, \
3036 "If non-zero, start verifying C heap after Nth call to " \
3037 "malloc/realloc/free") \
3038 \
3039 diagnostic(uintx, MallocMaxTestWords, 0, \
3040 "If non-zero, maximum number of words that malloc/realloc can " \
3041 "allocate (for testing only)") \
3042 \
3043 product(intx, TypeProfileWidth, 2, \
3044 "Number of receiver types to record in call/cast profile") \
3045 \
3046 develop(intx, BciProfileWidth, 2, \
3047 "Number of return bci's to record in ret profile") \
3048 \
3049 product(intx, PerMethodRecompilationCutoff, 400, \
3050 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3051 \
3052 product(intx, PerBytecodeRecompilationCutoff, 200, \
3053 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3054 \
3055 product(intx, PerMethodTrapLimit, 100, \
3056 "Limit on traps (of one kind) in a method (includes inlines)") \
3057 \
3058 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3059 "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3060 \
3061 product(intx, PerBytecodeTrapLimit, 4, \
3062 "Limit on traps (of one kind) at a particular BCI") \
3063 \
3064 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3065 "Extra method data trap entries for speculation") \
3066 \
3067 develop(intx, InlineFrequencyRatio, 20, \
3068 "Ratio of call site execution to caller method invocation") \
3069 \
3070 develop_pd(intx, InlineFrequencyCount, \
3071 "Count of call site execution necessary to trigger frequent " \
3072 "inlining") \
3073 \
3074 develop(intx, InlineThrowCount, 50, \
3075 "Force inlining of interpreted methods that throw this often") \
3076 \
3077 develop(intx, InlineThrowMaxSize, 200, \
3078 "Force inlining of throwing methods smaller than this") \
3079 \
3080 develop(intx, ProfilerNodeSize, 1024, \
3081 "Size in K to allocate for the Profile Nodes of each thread") \
3082 \
3083 product_pd(intx, PreInflateSpin, \
3084 "Number of times to spin wait before inflation") \
3085 \
3086 /* gc parameters */ \
3087 product(uintx, InitialHeapSize, 0, \
3088 "Initial heap size (in bytes); zero means use ergonomics") \
3089 \
3090 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3091 "Maximum heap size (in bytes)") \
3092 \
3093 product(uintx, OldSize, ScaleForWordSize(4*M), \
3094 "Initial tenured generation size (in bytes)") \
3095 \
3096 product(uintx, NewSize, ScaleForWordSize(1*M), \
3097 "Initial new generation size (in bytes)") \
3098 \
3099 product(uintx, MaxNewSize, max_uintx, \
3100 "Maximum new generation size (in bytes), max_uintx means set " \
3101 "ergonomically") \
3102 \
3103 product(uintx, PretenureSizeThreshold, 0, \
3104 "Maximum size in bytes of objects allocated in DefNew " \
3105 "generation; zero means no maximum") \
3106 \
3107 product(uintx, TLABSize, 0, \
3108 "Starting TLAB size (in bytes); zero means set ergonomically") \
3109 \
3110 product(uintx, MinTLABSize, 2*K, \
3111 "Minimum allowed TLAB size (in bytes)") \
3112 \
3113 product(uintx, TLABAllocationWeight, 35, \
3114 "Allocation averaging weight") \
3115 \
3116 product(uintx, TLABWasteTargetPercent, 1, \
3117 "Percentage of Eden that can be wasted") \
3118 \
3119 product(uintx, TLABRefillWasteFraction, 64, \
3120 "Maximum TLAB waste at a refill (internal fragmentation)") \
3121 \
3122 product(uintx, TLABWasteIncrement, 4, \
3123 "Increment allowed waste at slow allocation") \
3124 \
3125 product(uintx, SurvivorRatio, 8, \
3126 "Ratio of eden/survivor space size") \
3127 \
3128 product(uintx, NewRatio, 2, \
3129 "Ratio of old/new generation sizes") \
3130 \
3131 product_pd(uintx, NewSizeThreadIncrease, \
3132 "Additional size added to desired new generation size per " \
3133 "non-daemon thread (in bytes)") \
3134 \
3135 product_pd(uintx, MetaspaceSize, \
3136 "Initial size of Metaspaces (in bytes)") \
3137 \
3138 product(uintx, MaxMetaspaceSize, max_uintx, \
3139 "Maximum size of Metaspaces (in bytes)") \
3140 \
3141 product(uintx, CompressedClassSpaceSize, 1*G, \
3142 "Maximum size of class area in Metaspace when compressed " \
3143 "class pointers are used") \
3144 \
3145 manageable(uintx, MinHeapFreeRatio, 40, \
3146 "The minimum percentage of heap free after GC to avoid expansion."\
3147 " For most GCs this applies to the old generation. In G1 and" \
3148 " ParallelGC it applies to the whole heap.") \
3149 \
3150 manageable(uintx, MaxHeapFreeRatio, 70, \
3151 "The maximum percentage of heap free after GC to avoid shrinking."\
3152 " For most GCs this applies to the old generation. In G1 and" \
3153 " ParallelGC it applies to the whole heap.") \
3154 \
3155 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3156 "Number of milliseconds per MB of free space in the heap") \
3157 \
3158 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3159 "The minimum change in heap space due to GC (in bytes)") \
3160 \
3161 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3162 "The minimum expansion of Metaspace (in bytes)") \
3163 \
3164 product(uintx, MinMetaspaceFreeRatio, 40, \
3165 "The minimum percentage of Metaspace free after GC to avoid " \
3166 "expansion") \
3167 \
3168 product(uintx, MaxMetaspaceFreeRatio, 70, \
3169 "The maximum percentage of Metaspace free after GC to avoid " \
3170 "shrinking") \
3171 \
3172 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3173 "The maximum expansion of Metaspace without full GC (in bytes)") \
3174 \
3175 product(uintx, QueuedAllocationWarningCount, 0, \
3176 "Number of times an allocation that queues behind a GC " \
3177 "will retry before printing a warning") \
3178 \
3179 diagnostic(uintx, VerifyGCStartAt, 0, \
3180 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3181 \
3182 diagnostic(intx, VerifyGCLevel, 0, \
3183 "Generation level at which to start +VerifyBefore/AfterGC") \
3184 \
3185 product(uintx, MaxTenuringThreshold, 15, \
3186 "Maximum value for tenuring threshold") \
3187 \
3188 product(uintx, InitialTenuringThreshold, 7, \
3189 "Initial value for tenuring threshold") \
3190 \
3191 product(uintx, TargetSurvivorRatio, 50, \
3192 "Desired percentage of survivor space used after scavenge") \
3193 \
3194 product(uintx, MarkSweepDeadRatio, 5, \
3195 "Percentage (0-100) of the old gen allowed as dead wood. " \
3196 "Serial mark sweep treats this as both the minimum and maximum " \
3197 "value. " \
3198 "CMS uses this value only if it falls back to mark sweep. " \
3199 "Par compact uses a variable scale based on the density of the " \
3200 "generation and treats this as the maximum value when the heap " \
3201 "is either completely full or completely empty. Par compact " \
3202 "also has a smaller default value; see arguments.cpp.") \
3203 \
3204 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3205 "How often should we fully compact the heap (ignoring the dead " \
3206 "space parameters)") \
3207 \
3208 product(intx, PrintCMSStatistics, 0, \
3209 "Statistics for CMS") \
3210 \
3211 product(bool, PrintCMSInitiationStatistics, false, \
3212 "Statistics for initiating a CMS collection") \
3213 \
3214 product(intx, PrintFLSStatistics, 0, \
3215 "Statistics for CMS' FreeListSpace") \
3216 \
3217 product(intx, PrintFLSCensus, 0, \
3218 "Census for CMS' FreeListSpace") \
3219 \
3220 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3221 "Delay between expansion and allocation (in milliseconds)") \
3222 \
3223 develop(uintx, GCWorkerDelayMillis, 0, \
3224 "Delay in scheduling GC workers (in milliseconds)") \
3225 \
3226 product(intx, DeferThrSuspendLoopCount, 4000, \
3227 "(Unstable) Number of times to iterate in safepoint loop " \
3228 "before blocking VM threads ") \
3229 \
3230 product(intx, DeferPollingPageLoopCount, -1, \
3231 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3232 "before changing safepoint polling page to RO ") \
3233 \
3234 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3235 \
3236 product(bool, PSChunkLargeArrays, true, \
3237 "Process large arrays in chunks") \
3238 \
3239 product(uintx, GCDrainStackTargetSize, 64, \
3240 "Number of entries we will try to leave on the stack " \
3241 "during parallel gc") \
3242 \
3243 /* stack parameters */ \
3244 product_pd(intx, StackYellowPages, \
3245 "Number of yellow zone (recoverable overflows) pages") \
3246 \
3247 product_pd(intx, StackRedPages, \
3248 "Number of red zone (unrecoverable overflows) pages") \
3249 \
3250 product_pd(intx, StackShadowPages, \
3251 "Number of shadow zone (for overflow checking) pages " \
3252 "this should exceed the depth of the VM and native call stack") \
3253 \
3254 product_pd(intx, ThreadStackSize, \
3255 "Thread Stack Size (in Kbytes)") \
3256 \
3257 product_pd(intx, VMThreadStackSize, \
3258 "Non-Java Thread Stack Size (in Kbytes)") \
3259 \
3260 product_pd(intx, CompilerThreadStackSize, \
3261 "Compiler Thread Stack Size (in Kbytes)") \
3262 \
3263 develop_pd(uintx, JVMInvokeMethodSlack, \
3264 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3265 \
3266 product(uintx, ThreadSafetyMargin, 50*M, \
3267 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3268 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3269 "disable this feature") \
3270 \
3271 /* code cache parameters */ \
3272 develop(uintx, CodeCacheSegmentSize, 64, \
3273 "Code cache segment size (in bytes) - smallest unit of " \
3274 "allocation") \
3275 \
3276 develop_pd(intx, CodeEntryAlignment, \
3277 "Code entry alignment for generated code (in bytes)") \
3278 \
3279 product_pd(intx, OptoLoopAlignment, \
3280 "Align inner loops to zero relative to this modulus") \
3281 \
3282 product_pd(uintx, InitialCodeCacheSize, \
3283 "Initial code cache size (in bytes)") \
3284 \
3285 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3286 "Minimum code cache size (in bytes) required to start VM.") \
3287 \
3288 product_pd(uintx, ReservedCodeCacheSize, \
3289 "Reserved code cache size (in bytes) - maximum code cache size") \
3290 \
3291 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3292 "When less than X space left, we stop compiling") \
3293 \
3294 product_pd(uintx, CodeCacheExpansionSize, \
3295 "Code cache expansion size (in bytes)") \
3296 \
3297 develop_pd(uintx, CodeCacheMinBlockLength, \
3298 "Minimum number of segments in a code cache block") \
3299 \
3300 notproduct(bool, ExitOnFullCodeCache, false, \
3301 "Exit the VM if we fill the code cache") \
3302 \
3303 product(bool, UseCodeCacheFlushing, true, \
3304 "Remove cold/old nmethods from the code cache") \
3305 \
3306 /* interpreter debugging */ \
3307 develop(intx, BinarySwitchThreshold, 5, \
3308 "Minimal number of lookupswitch entries for rewriting to binary " \
3309 "switch") \
3310 \
3311 develop(intx, StopInterpreterAt, 0, \
3312 "Stop interpreter execution at specified bytecode number") \
3313 \
3314 develop(intx, TraceBytecodesAt, 0, \
3315 "Trace bytecodes starting with specified bytecode number") \
3316 \
3317 /* compiler interface */ \
3318 develop(intx, CIStart, 0, \
3319 "The id of the first compilation to permit") \
3320 \
3321 develop(intx, CIStop, max_jint, \
3322 "The id of the last compilation to permit") \
3323 \
3324 develop(intx, CIStartOSR, 0, \
3325 "The id of the first osr compilation to permit " \
3326 "(CICountOSR must be on)") \
3327 \
3328 develop(intx, CIStopOSR, max_jint, \
3329 "The id of the last osr compilation to permit " \
3330 "(CICountOSR must be on)") \
3331 \
3332 develop(intx, CIBreakAtOSR, -1, \
3333 "The id of osr compilation to break at") \
3334 \
3335 develop(intx, CIBreakAt, -1, \
3336 "The id of compilation to break at") \
3337 \
3338 product(ccstrlist, CompileOnly, "", \
3339 "List of methods (pkg/class.name) to restrict compilation to") \
3340 \
3341 product(ccstr, CompileCommandFile, NULL, \
3342 "Read compiler commands from this file [.hotspot_compiler]") \
3343 \
3344 product(ccstrlist, CompileCommand, "", \
3345 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3346 \
3347 develop(bool, ReplayCompiles, false, \
3348 "Enable replay of compilations from ReplayDataFile") \
3349 \
3350 product(ccstr, ReplayDataFile, NULL, \
3351 "File containing compilation replay information" \
3352 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3353 \
3354 product(ccstr, InlineDataFile, NULL, \
3355 "File containing inlining replay information" \
3356 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3357 \
3358 develop(intx, ReplaySuppressInitializers, 2, \
3359 "Control handling of class initialization during replay: " \
3360 "0 - don't do anything special; " \
3361 "1 - treat all class initializers as empty; " \
3362 "2 - treat class initializers for application classes as empty; " \
3363 "3 - allow all class initializers to run during bootstrap but " \
3364 " pretend they are empty after starting replay") \
3365 \
3366 develop(bool, ReplayIgnoreInitErrors, false, \
3367 "Ignore exceptions thrown during initialization for replay") \
3368 \
3369 product(bool, DumpReplayDataOnError, true, \
3370 "Record replay data for crashing compiler threads") \
3371 \
3372 product(bool, CICompilerCountPerCPU, false, \
3373 "1 compiler thread for log(N CPUs)") \
3374 \
3375 develop(intx, CIFireOOMAt, -1, \
3376 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3377 "(non-negative value throws OOM after this many CI accesses " \
3378 "in each compile)") \
3379 notproduct(intx, CICrashAt, -1, \
3380 "id of compilation to trigger assert in compiler thread for " \
3381 "the purpose of testing, e.g. generation of replay data") \
3382 notproduct(bool, CIObjectFactoryVerify, false, \
3383 "enable potentially expensive verification in ciObjectFactory") \
3384 \
3385 /* Priorities */ \
3386 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3387 \
3388 product(intx, ThreadPriorityPolicy, 0, \
3389 "0 : Normal. "\
3390 " VM chooses priorities that are appropriate for normal "\
3391 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3392 " to normal native priority. Java priorities below " \
3393 " NORM_PRIORITY map to lower native priority values. On "\
3394 " Windows applications are allowed to use higher native "\
3395 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3396 " not use the highest possible native priority, "\
3397 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3398 " system threads. On Linux thread priorities are ignored "\
3399 " because the OS does not support static priority in "\
3400 " SCHED_OTHER scheduling class which is the only choice for "\
3401 " non-root, non-realtime applications. "\
3402 "1 : Aggressive. "\
3403 " Java thread priorities map over to the entire range of "\
3404 " native thread priorities. Higher Java thread priorities map "\
3405 " to higher native thread priorities. This policy should be "\
3406 " used with care, as sometimes it can cause performance "\
3407 " degradation in the application and/or the entire system. On "\
3408 " Linux this policy requires root privilege.") \
3409 \
3410 product(bool, ThreadPriorityVerbose, false, \
3411 "Print priority changes") \
3412 \
3413 product(intx, DefaultThreadPriority, -1, \
3414 "The native priority at which threads run if not elsewhere " \
3415 "specified (-1 means no change)") \
3416 \
3417 product(intx, CompilerThreadPriority, -1, \
3418 "The native priority at which compiler threads should run " \
3419 "(-1 means no change)") \
3420 \
3421 product(intx, VMThreadPriority, -1, \
3422 "The native priority at which the VM thread should run " \
3423 "(-1 means no change)") \
3424 \
3425 product(bool, CompilerThreadHintNoPreempt, true, \
3426 "(Solaris only) Give compiler threads an extra quanta") \
3427 \
3428 product(bool, VMThreadHintNoPreempt, false, \
3429 "(Solaris only) Give VM thread an extra quanta") \
3430 \
3431 product(intx, JavaPriority1_To_OSPriority, -1, \
3432 "Map Java priorities to OS priorities") \
3433 \
3434 product(intx, JavaPriority2_To_OSPriority, -1, \
3435 "Map Java priorities to OS priorities") \
3436 \
3437 product(intx, JavaPriority3_To_OSPriority, -1, \
3438 "Map Java priorities to OS priorities") \
3439 \
3440 product(intx, JavaPriority4_To_OSPriority, -1, \
3441 "Map Java priorities to OS priorities") \
3442 \
3443 product(intx, JavaPriority5_To_OSPriority, -1, \
3444 "Map Java priorities to OS priorities") \
3445 \
3446 product(intx, JavaPriority6_To_OSPriority, -1, \
3447 "Map Java priorities to OS priorities") \
3448 \
3449 product(intx, JavaPriority7_To_OSPriority, -1, \
3450 "Map Java priorities to OS priorities") \
3451 \
3452 product(intx, JavaPriority8_To_OSPriority, -1, \
3453 "Map Java priorities to OS priorities") \
3454 \
3455 product(intx, JavaPriority9_To_OSPriority, -1, \
3456 "Map Java priorities to OS priorities") \
3457 \
3458 product(intx, JavaPriority10_To_OSPriority,-1, \
3459 "Map Java priorities to OS priorities") \
3460 \
3461 experimental(bool, UseCriticalJavaThreadPriority, false, \
3462 "Java thread priority 10 maps to critical scheduling priority") \
3463 \
3464 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3465 "Compiler thread(s) run at critical scheduling priority") \
3466 \
3467 experimental(bool, UseCriticalCMSThreadPriority, false, \
3468 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3469 \
3470 /* compiler debugging */ \
3471 notproduct(intx, CompileTheWorldStartAt, 1, \
3472 "First class to consider when using +CompileTheWorld") \
3473 \
3474 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3475 "Last class to consider when using +CompileTheWorld") \
3476 \
3477 develop(intx, NewCodeParameter, 0, \
3478 "Testing Only: Create a dedicated integer parameter before " \
3479 "putback") \
3480 \
3481 /* new oopmap storage allocation */ \
3482 develop(intx, MinOopMapAllocation, 8, \
3483 "Minimum number of OopMap entries in an OopMapSet") \
3484 \
3485 /* Background Compilation */ \
3486 develop(intx, LongCompileThreshold, 50, \
3487 "Used with +TraceLongCompiles") \
3488 \
3489 product(intx, StarvationMonitorInterval, 200, \
3490 "Pause between each check (in milliseconds)") \
3491 \
3492 /* recompilation */ \
3493 product_pd(intx, CompileThreshold, \
3494 "number of interpreted method invocations before (re-)compiling") \
3495 \
3496 product_pd(intx, BackEdgeThreshold, \
3497 "Interpreter Back edge threshold at which an OSR compilation is " \
3498 "invoked") \
3499 \
3500 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3501 "Interpreter (tier 0) invocation notification frequency") \
3502 \
3503 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3504 "C1 without MDO (tier 2) invocation notification frequency") \
3505 \
3506 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3507 "C1 with MDO profiling (tier 3) invocation notification " \
3508 "frequency") \
3509 \
3510 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3511 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3512 \
3513 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3514 "Interpreter (tier 0) invocation notification frequency") \
3515 \
3516 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3517 "C1 without MDO (tier 2) invocation notification frequency") \
3518 \
3519 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3520 "C1 with MDO profiling (tier 3) invocation notification " \
3521 "frequency") \
3522 \
3523 product(intx, Tier2CompileThreshold, 0, \
3524 "threshold at which tier 2 compilation is invoked") \
3525 \
3526 product(intx, Tier2BackEdgeThreshold, 0, \
3527 "Back edge threshold at which tier 2 compilation is invoked") \
3528 \
3529 product(intx, Tier3InvocationThreshold, 200, \
3530 "Compile if number of method invocations crosses this " \
3531 "threshold") \
3532 \
3533 product(intx, Tier3MinInvocationThreshold, 100, \
3534 "Minimum invocation to compile at tier 3") \
3535 \
3536 product(intx, Tier3CompileThreshold, 2000, \
3537 "Threshold at which tier 3 compilation is invoked (invocation " \
3538 "minimum must be satisfied") \
3539 \
3540 product(intx, Tier3BackEdgeThreshold, 60000, \
3541 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3542 \
3543 product(intx, Tier4InvocationThreshold, 5000, \
3544 "Compile if number of method invocations crosses this " \
3545 "threshold") \
3546 \
3547 product(intx, Tier4MinInvocationThreshold, 600, \
3548 "Minimum invocation to compile at tier 4") \
3549 \
3550 product(intx, Tier4CompileThreshold, 15000, \
3551 "Threshold at which tier 4 compilation is invoked (invocation " \
3552 "minimum must be satisfied") \
3553 \
3554 product(intx, Tier4BackEdgeThreshold, 40000, \
3555 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3556 \
3557 product(intx, Tier3DelayOn, 5, \
3558 "If C2 queue size grows over this amount per compiler thread " \
3559 "stop compiling at tier 3 and start compiling at tier 2") \
3560 \
3561 product(intx, Tier3DelayOff, 2, \
3562 "If C2 queue size is less than this amount per compiler thread " \
3563 "allow methods compiled at tier 2 transition to tier 3") \
3564 \
3565 product(intx, Tier3LoadFeedback, 5, \
3566 "Tier 3 thresholds will increase twofold when C1 queue size " \
3567 "reaches this amount per compiler thread") \
3568 \
3569 product(intx, Tier4LoadFeedback, 3, \
3570 "Tier 4 thresholds will increase twofold when C2 queue size " \
3571 "reaches this amount per compiler thread") \
3572 \
3573 product(intx, TieredCompileTaskTimeout, 50, \
3574 "Kill compile task if method was not used within " \
3575 "given timeout in milliseconds") \
3576 \
3577 product(intx, TieredStopAtLevel, 4, \
3578 "Stop at given compilation level") \
3579 \
3580 product(intx, Tier0ProfilingStartPercentage, 200, \
3581 "Start profiling in interpreter if the counters exceed tier 3 " \
3582 "thresholds by the specified percentage") \
3583 \
3584 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3585 "Increase the compile threshold for C1 compilation if the code " \
3586 "cache is filled by the specified percentage") \
3587 \
3588 product(intx, TieredRateUpdateMinTime, 1, \
3589 "Minimum rate sampling interval (in milliseconds)") \
3590 \
3591 product(intx, TieredRateUpdateMaxTime, 25, \
3592 "Maximum rate sampling interval (in milliseconds)") \
3593 \
3594 product_pd(bool, TieredCompilation, \
3595 "Enable tiered compilation") \
3596 \
3597 product(bool, PrintTieredEvents, false, \
3598 "Print tiered events notifications") \
3599 \
3600 product_pd(intx, OnStackReplacePercentage, \
3601 "NON_TIERED number of method invocations/branches (expressed as " \
3602 "% of CompileThreshold) before (re-)compiling OSR code") \
3603 \
3604 product(intx, InterpreterProfilePercentage, 33, \
3605 "NON_TIERED number of method invocations/branches (expressed as " \
3606 "% of CompileThreshold) before profiling in the interpreter") \
3607 \
3608 develop(intx, MaxRecompilationSearchLength, 10, \
3609 "The maximum number of frames to inspect when searching for " \
3610 "recompilee") \
3611 \
3612 develop(intx, MaxInterpretedSearchLength, 3, \
3613 "The maximum number of interpreted frames to skip when searching "\
3614 "for recompilee") \
3615 \
3616 develop(intx, DesiredMethodLimit, 8000, \
3617 "The desired maximum method size (in bytecodes) after inlining") \
3618 \
3619 develop(intx, HugeMethodLimit, 8000, \
3620 "Don't compile methods larger than this if " \
3621 "+DontCompileHugeMethods") \
3622 \
3623 /* New JDK 1.4 reflection implementation */ \
3624 \
3625 develop(bool, UseNewReflection, true, \
3626 "Temporary flag for transition to reflection based on dynamic " \
3627 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3628 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3629 "changes were needed") \
3630 \
3631 develop(bool, VerifyReflectionBytecodes, false, \
3632 "Force verification of 1.4 reflection bytecodes. Does not work " \
3633 "in situations like that described in 4486457 or for " \
3634 "constructors generated for serialization, so can not be enabled "\
3635 "in product.") \
3636 \
3637 product(bool, ReflectionWrapResolutionErrors, true, \
3638 "Temporary flag for transition to AbstractMethodError wrapped " \
3639 "in InvocationTargetException. See 6531596") \
3640 \
3641 develop(intx, FastSuperclassLimit, 8, \
3642 "Depth of hardwired instanceof accelerator array") \
3643 \
3644 /* Properties for Java libraries */ \
3645 \
3646 product(uintx, MaxDirectMemorySize, 0, \
3647 "Maximum total size of NIO direct-buffer allocations") \
3648 \
3649 /* temporary developer defined flags */ \
3650 \
3651 diagnostic(bool, UseNewCode, false, \
3652 "Testing Only: Use the new version while testing") \
3653 \
3654 diagnostic(bool, UseNewCode2, false, \
3655 "Testing Only: Use the new version while testing") \
3656 \
3657 diagnostic(bool, UseNewCode3, false, \
3658 "Testing Only: Use the new version while testing") \
3659 \
3660 /* flags for performance data collection */ \
3661 \
3662 product(bool, UsePerfData, falseInEmbedded, \
3663 "Flag to disable jvmstat instrumentation for performance testing "\
3664 "and problem isolation purposes") \
3665 \
3666 product(bool, PerfDataSaveToFile, false, \
3667 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3668 \
3669 product(ccstr, PerfDataSaveFile, NULL, \
3670 "Save PerfData memory to the specified absolute pathname. " \
3671 "The string %p in the file name (if present) " \
3672 "will be replaced by pid") \
3673 \
3674 product(intx, PerfDataSamplingInterval, 50, \
3675 "Data sampling interval (in milliseconds)") \
3676 \
3677 develop(bool, PerfTraceDataCreation, false, \
3678 "Trace creation of Performance Data Entries") \
3679 \
3680 develop(bool, PerfTraceMemOps, false, \
3681 "Trace PerfMemory create/attach/detach calls") \
3682 \
3683 product(bool, PerfDisableSharedMem, false, \
3684 "Store performance data in standard memory") \
3685 \
3686 product(intx, PerfDataMemorySize, 32*K, \
3687 "Size of performance data memory region. Will be rounded " \
3688 "up to a multiple of the native os page size.") \
3689 \
3690 product(intx, PerfMaxStringConstLength, 1024, \
3691 "Maximum PerfStringConstant string length before truncation") \
3692 \
3693 product(bool, PerfAllowAtExitRegistration, false, \
3694 "Allow registration of atexit() methods") \
3695 \
3696 product(bool, PerfBypassFileSystemCheck, false, \
3697 "Bypass Win32 file system criteria checks (Windows Only)") \
3698 \
3699 product(intx, UnguardOnExecutionViolation, 0, \
3700 "Unguard page and retry on no-execute fault (Win32 only) " \
3701 "0=off, 1=conservative, 2=aggressive") \
3702 \
3703 /* Serviceability Support */ \
3704 \
3705 product(bool, ManagementServer, false, \
3706 "Create JMX Management Server") \
3707 \
3708 product(bool, DisableAttachMechanism, false, \
3709 "Disable mechanism that allows tools to attach to this VM") \
3710 \
3711 product(bool, StartAttachListener, false, \
3712 "Always start Attach Listener at VM startup") \
3713 \
3714 manageable(bool, PrintConcurrentLocks, false, \
3715 "Print java.util.concurrent locks in thread dump") \
3716 \
3717 product(bool, TransmitErrorReport, false, \
3718 "Enable error report transmission on erroneous termination") \
3719 \
3720 product(ccstr, ErrorReportServer, NULL, \
3721 "Override built-in error report server address") \
3722 \
3723 /* Shared spaces */ \
3724 \
3725 product(bool, UseSharedSpaces, true, \
3726 "Use shared spaces for metadata") \
3727 \
3728 product(bool, RequireSharedSpaces, false, \
3729 "Require shared spaces for metadata") \
3730 \
3731 product(bool, DumpSharedSpaces, false, \
3732 "Special mode: JVM reads a class list, loads classes, builds " \
3733 "shared spaces, and dumps the shared spaces to a file to be " \
3734 "used in future JVM runs") \
3735 \
3736 product(bool, PrintSharedSpaces, false, \
3737 "Print usage of shared spaces") \
3738 \
3739 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3740 "Size of read-write space for metadata (in bytes)") \
3741 \
3742 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3743 "Size of read-only space for metadata (in bytes)") \
3744 \
3745 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3746 "Size of the shared miscellaneous data area (in bytes)") \
3747 \
3748 product(uintx, SharedMiscCodeSize, 120*K, \
3749 "Size of the shared miscellaneous code area (in bytes)") \
3750 \
3751 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3752 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3753 "Address to allocate shared memory region for class data") \
3754 \
3755 diagnostic(bool, EnableInvokeDynamic, true, \
3756 "support JSR 292 (method handles, invokedynamic, " \
3757 "anonymous classes") \
3758 \
3759 diagnostic(bool, PrintMethodHandleStubs, false, \
3760 "Print generated stub code for method handles") \
3761 \
3762 develop(bool, TraceMethodHandles, false, \
3763 "trace internal method handle operations") \
3764 \
3765 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3766 "perform extra checks when constructing method handles") \
3767 \
3768 diagnostic(bool, ShowHiddenFrames, false, \
3769 "show method handle implementation frames (usually hidden)") \
3770 \
3771 experimental(bool, TrustFinalNonStaticFields, false, \
3772 "trust final non-static declarations for constant folding") \
3773 \
3774 experimental(bool, FoldStableValues, false, \
3775 "Private flag to control optimizations for stable variables") \
3776 \
3777 develop(bool, TraceInvokeDynamic, false, \
3778 "trace internal invoke dynamic operations") \
3779 \
3780 diagnostic(bool, PauseAtStartup, false, \
3781 "Causes the VM to pause at startup time and wait for the pause " \
3782 "file to be removed (default: ./vm.paused.<pid>)") \
3783 \
3784 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3785 "The file to create and for whose removal to await when pausing " \
3786 "at startup. (default: ./vm.paused.<pid>)") \
3787 \
3788 diagnostic(bool, PauseAtExit, false, \
3789 "Pause and wait for keypress on exit if a debugger is attached") \
3790 \
3791 product(bool, ExtendedDTraceProbes, false, \
3792 "Enable performance-impacting dtrace probes") \
3793 \
3794 product(bool, DTraceMethodProbes, false, \
3795 "Enable dtrace probes for method-entry and method-exit") \
3796 \
3797 product(bool, DTraceAllocProbes, false, \
3798 "Enable dtrace probes for object allocation") \
3799 \
3800 product(bool, DTraceMonitorProbes, false, \
3801 "Enable dtrace probes for monitor events") \
3802 \
3803 product(bool, RelaxAccessControlCheck, false, \
3804 "Relax the access control checks in the verifier") \
3805 \
3806 diagnostic(bool, PrintDTraceDOF, false, \
3807 "Print the DTrace DOF passed to the system for JSDT probes") \
3808 \
3809 product(uintx, StringTableSize, defaultStringTableSize, \
3810 "Number of buckets in the interned String table") \
3811 \
3812 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
3813 "Number of buckets in the JVM internal Symbol table") \
3814 \
3815 product(bool, UseStringDeduplication, false, \
3816 "Use string deduplication") \
3817 \
3818 product(bool, PrintStringDeduplicationStatistics, false, \
3819 "Print string deduplication statistics") \
3820 \
3821 product(uintx, StringDeduplicationAgeThreshold, 3, \
3822 "A string must reach this age (or be promoted to an old region) " \
3823 "to be considered for deduplication") \
3824 \
3825 diagnostic(bool, StringDeduplicationResizeALot, false, \
3826 "Force table resize every time the table is scanned") \
3827 \
3828 diagnostic(bool, StringDeduplicationRehashALot, false, \
3829 "Force table rehash every time the table is scanned") \
3830 \
3831 develop(bool, TraceDefaultMethods, false, \
3832 "Trace the default method processing steps") \
3833 \
3834 develop(bool, VerifyGenericSignatures, false, \
3835 "Abort VM on erroneous or inconsistent generic signatures") \
3836 \
3837 product(bool, UseVMInterruptibleIO, false, \
3838 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3839 "EINTR for I/O operations results in OS_INTRPT. The default " \
3840 "value of this flag is true for JDK 6 and earlier") \
3841 \
3842 diagnostic(bool, WhiteBoxAPI, false, \
3843 "Enable internal testing APIs") \
3844 \
3845 product(bool, PrintGCCause, true, \
3846 "Include GC cause in GC logging") \
3847 \
3848 product(bool , AllowNonVirtualCalls, false, \
3849 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3850 \
3851 diagnostic(ccstr, SharedArchiveFile, NULL, \
3852 "Override the default location of the CDS archive file") \
3853 \
3854 experimental(uintx, ArrayAllocatorMallocLimit, \
3855 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3856 "Allocation less than this value will be allocated " \
3857 "using malloc. Larger allocations will use mmap.") \
3858 \
3859 product(bool, EnableTracing, false, \
3860 "Enable event-based tracing") \
3861 \
3862 product(bool, UseLockedTracing, false, \
3863 "Use locked-tracing when doing event-based tracing")
3865 /*
3866 * Macros for factoring of globals
3867 */
3869 // Interface macros
3870 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3871 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3872 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3873 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3874 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3875 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3876 #ifdef PRODUCT
3877 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
3878 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
3879 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
3880 #else
3881 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3882 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3883 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3884 #endif
3885 // Special LP64 flags, product only needed for now.
3886 #ifdef _LP64
3887 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3888 #else
3889 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3890 #endif // _LP64
3892 // Implementation macros
3893 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3894 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3895 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3896 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3897 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3898 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3899 #ifdef PRODUCT
3900 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
3901 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
3902 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
3903 #else
3904 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3905 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3906 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3907 #endif
3908 #ifdef _LP64
3909 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3910 #else
3911 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3912 #endif // _LP64
3914 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)
3916 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3918 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3920 // Extensions
3922 #include "runtime/globals_ext.hpp"
3924 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP