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 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/debug.hpp"
29
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
39
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_linux
56 # include "globals_linux.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_solaris
59 # include "globals_solaris.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_windows
62 # include "globals_windows.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_aix
65 # include "globals_aix.hpp"
66 #endif
67 #ifdef TARGET_OS_FAMILY_bsd
68 # include "globals_bsd.hpp"
69 #endif
70 #ifdef TARGET_OS_ARCH_linux_x86
71 # include "globals_linux_x86.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_sparc
74 # include "globals_linux_sparc.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_linux_zero
77 # include "globals_linux_zero.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_solaris_x86
80 # include "globals_solaris_x86.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_solaris_sparc
83 # include "globals_solaris_sparc.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_windows_x86
86 # include "globals_windows_x86.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_linux_arm
89 # include "globals_linux_arm.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_linux_ppc
92 # include "globals_linux_ppc.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_aix_ppc
95 # include "globals_aix_ppc.hpp"
96 #endif
97 #ifdef TARGET_OS_ARCH_bsd_x86
98 # include "globals_bsd_x86.hpp"
99 #endif
100 #ifdef TARGET_OS_ARCH_bsd_zero
101 # include "globals_bsd_zero.hpp"
102 #endif
103 #ifdef COMPILER1
104 #ifdef TARGET_ARCH_x86
105 # include "c1_globals_x86.hpp"
106 #endif
107 #ifdef TARGET_ARCH_sparc
108 # include "c1_globals_sparc.hpp"
109 #endif
110 #ifdef TARGET_ARCH_arm
111 # include "c1_globals_arm.hpp"
112 #endif
113 #ifdef TARGET_ARCH_ppc
114 # include "c1_globals_ppc.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_linux
117 # include "c1_globals_linux.hpp"
118 #endif
119 #ifdef TARGET_OS_FAMILY_solaris
120 # include "c1_globals_solaris.hpp"
121 #endif
122 #ifdef TARGET_OS_FAMILY_windows
123 # include "c1_globals_windows.hpp"
124 #endif
125 #ifdef TARGET_OS_FAMILY_aix
126 # include "c1_globals_aix.hpp"
127 #endif
128 #ifdef TARGET_OS_FAMILY_bsd
129 # include "c1_globals_bsd.hpp"
130 #endif
131 #endif
132 #ifdef COMPILER2
133 #ifdef TARGET_ARCH_x86
134 # include "c2_globals_x86.hpp"
135 #endif
136 #ifdef TARGET_ARCH_sparc
137 # include "c2_globals_sparc.hpp"
138 #endif
139 #ifdef TARGET_ARCH_arm
140 # include "c2_globals_arm.hpp"
141 #endif
142 #ifdef TARGET_ARCH_ppc
143 # include "c2_globals_ppc.hpp"
144 #endif
145 #ifdef TARGET_OS_FAMILY_linux
146 # include "c2_globals_linux.hpp"
147 #endif
148 #ifdef TARGET_OS_FAMILY_solaris
149 # include "c2_globals_solaris.hpp"
150 #endif
151 #ifdef TARGET_OS_FAMILY_windows
152 # include "c2_globals_windows.hpp"
153 #endif
154 #ifdef TARGET_OS_FAMILY_aix
155 # include "c2_globals_aix.hpp"
156 #endif
157 #ifdef TARGET_OS_FAMILY_bsd
158 # include "c2_globals_bsd.hpp"
159 #endif
160 #endif
161 #ifdef SHARK
162 #ifdef TARGET_ARCH_zero
163 # include "shark_globals_zero.hpp"
164 #endif
165 #endif
166
167 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
168 define_pd_global(bool, BackgroundCompilation, false);
169 define_pd_global(bool, UseTLAB, false);
170 define_pd_global(bool, CICompileOSR, false);
171 define_pd_global(bool, UseTypeProfile, false);
172 define_pd_global(bool, UseOnStackReplacement, false);
173 define_pd_global(bool, InlineIntrinsics, false);
174 define_pd_global(bool, PreferInterpreterNativeStubs, true);
175 define_pd_global(bool, ProfileInterpreter, false);
176 define_pd_global(bool, ProfileTraps, false);
177 define_pd_global(bool, TieredCompilation, false);
178
179 define_pd_global(intx, CompileThreshold, 0);
180
181 define_pd_global(intx, OnStackReplacePercentage, 0);
182 define_pd_global(bool, ResizeTLAB, false);
183 define_pd_global(intx, FreqInlineSize, 0);
184 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
185 define_pd_global(intx, InlineClassNatives, true);
186 define_pd_global(intx, InlineUnsafeOps, true);
187 define_pd_global(intx, InitialCodeCacheSize, 160*K);
188 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
189 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
190 define_pd_global(intx, CodeCacheMinBlockLength, 1);
191 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
192 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M));
193 define_pd_global(bool, NeverActAsServerClassMachine, true);
194 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
195 #define CI_COMPILER_COUNT 0
196 #else
197
198 #ifdef COMPILER2
199 #define CI_COMPILER_COUNT 2
200 #else
201 #define CI_COMPILER_COUNT 1
202 #endif // COMPILER2
203
204 #endif // no compilers
205
206 // string type aliases used only in this file
207 typedef const char* ccstr;
208 typedef const char* ccstrlist; // represents string arguments which accumulate
209
210 struct Flag {
211 enum Flags {
212 // value origin
213 DEFAULT = 0,
214 COMMAND_LINE = 1,
215 ENVIRON_VAR = 2,
216 CONFIG_FILE = 3,
217 MANAGEMENT = 4,
218 ERGONOMIC = 5,
219 ATTACH_ON_DEMAND = 6,
220 INTERNAL = 7,
221
222 LAST_VALUE_ORIGIN = INTERNAL,
223 VALUE_ORIGIN_BITS = 4,
224 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
225
226 // flag kind
227 KIND_PRODUCT = 1 << 4,
228 KIND_MANAGEABLE = 1 << 5,
229 KIND_DIAGNOSTIC = 1 << 6,
230 KIND_EXPERIMENTAL = 1 << 7,
231 KIND_NOT_PRODUCT = 1 << 8,
232 KIND_DEVELOP = 1 << 9,
233 KIND_PLATFORM_DEPENDENT = 1 << 10,
234 KIND_READ_WRITE = 1 << 11,
235 KIND_C1 = 1 << 12,
236 KIND_C2 = 1 << 13,
237 KIND_ARCH = 1 << 14,
238 KIND_SHARK = 1 << 15,
239 KIND_LP64_PRODUCT = 1 << 16,
240 KIND_COMMERCIAL = 1 << 17,
241
242 KIND_MASK = ~VALUE_ORIGIN_MASK
243 };
244
245 const char* _type;
246 const char* _name;
247 void* _addr;
248 NOT_PRODUCT(const char* _doc;)
249 Flags _flags;
250
251 // points to all Flags static array
252 static Flag* flags;
253
254 // number of flags
255 static size_t numFlags;
256
257 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
258 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
259
260 void check_writable();
261
262 bool is_bool() const;
263 bool get_bool() const;
264 void set_bool(bool value);
265
266 bool is_intx() const;
267 intx get_intx() const;
268 void set_intx(intx value);
269
270 bool is_uintx() const;
271 uintx get_uintx() const;
272 void set_uintx(uintx value);
273
274 bool is_uint64_t() const;
275 uint64_t get_uint64_t() const;
276 void set_uint64_t(uint64_t value);
277
278 bool is_double() const;
279 double get_double() const;
280 void set_double(double value);
281
282 bool is_ccstr() const;
283 bool ccstr_accumulates() const;
284 ccstr get_ccstr() const;
285 void set_ccstr(ccstr value);
286
287 Flags get_origin();
288 void set_origin(Flags origin);
289
290 bool is_default();
291 bool is_ergonomic();
292 bool is_command_line();
293
294 bool is_product() const;
295 bool is_manageable() const;
296 bool is_diagnostic() const;
297 bool is_experimental() const;
298 bool is_notproduct() const;
299 bool is_develop() const;
300 bool is_read_write() const;
301 bool is_commercial() const;
302
303 bool is_constant_in_binary() const;
304
305 bool is_unlocker() const;
306 bool is_unlocked() const;
307 bool is_writeable() const;
308 bool is_external() const;
309
310 bool is_unlocker_ext() const;
311 bool is_unlocked_ext() const;
312 bool is_writeable_ext() const;
313 bool is_external_ext() const;
314
315 void get_locked_message(char*, int) const;
316 void get_locked_message_ext(char*, int) const;
317
318 void print_on(outputStream* st, bool withComments = false );
319 void print_kind(outputStream* st);
320 void print_as_flag(outputStream* st);
321 };
322
323 // debug flags control various aspects of the VM and are global accessible
324
325 // use FlagSetting to temporarily change some debug flag
326 // e.g. FlagSetting fs(DebugThisAndThat, true);
327 // restored to previous value upon leaving scope
328 class FlagSetting {
329 bool val;
330 bool* flag;
331 public:
332 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
333 ~FlagSetting() { *flag = val; }
334 };
335
336
337 class CounterSetting {
338 intx* counter;
339 public:
340 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
341 ~CounterSetting() { (*counter)--; }
342 };
343
344
345 class UIntFlagSetting {
346 uintx val;
347 uintx* flag;
348 public:
349 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
350 ~UIntFlagSetting() { *flag = val; }
351 };
352
353
354 class DoubleFlagSetting {
355 double val;
356 double* flag;
357 public:
358 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
359 ~DoubleFlagSetting() { *flag = val; }
360 };
361
362
363 class CommandLineFlags {
364 public:
365 static bool boolAt(char* name, size_t len, bool* value);
366 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
367 static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
368 static bool boolAtPut(char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
369
370 static bool intxAt(char* name, size_t len, intx* value);
371 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
372 static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
373 static bool intxAtPut(char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
374
375 static bool uintxAt(char* name, size_t len, uintx* value);
376 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
377 static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
378 static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
379
380 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
381 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
382 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
383 static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
384
385 static bool doubleAt(char* name, size_t len, double* value);
386 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
387 static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
388 static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
389
390 static bool ccstrAt(char* name, size_t len, ccstr* value);
391 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
392 // Contract: Flag will make private copy of the incoming value.
393 // Outgoing value is always malloc-ed, and caller MUST call free.
394 static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
395 static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
396
397 // Returns false if name is not a command line flag.
398 static bool wasSetOnCmdline(const char* name, bool* value);
399 static void printSetFlags(outputStream* out);
400
401 static void printFlags(outputStream* out, bool withComments);
402
403 static void verify() PRODUCT_RETURN;
404 };
405
406 // use this for flags that are true by default in the debug version but
407 // false in the optimized version, and vice versa
408 #ifdef ASSERT
409 #define trueInDebug true
410 #define falseInDebug false
411 #else
412 #define trueInDebug false
413 #define falseInDebug true
414 #endif
415
416 // use this for flags that are true per default in the product build
417 // but false in development builds, and vice versa
418 #ifdef PRODUCT
419 #define trueInProduct true
420 #define falseInProduct false
421 #else
422 #define trueInProduct false
423 #define falseInProduct true
424 #endif
425
426 #ifdef JAVASE_EMBEDDED
427 #define falseInEmbedded false
428 #else
429 #define falseInEmbedded true
430 #endif
431
432 // develop flags are settable / visible only during development and are constant in the PRODUCT version
433 // product flags are always settable / visible
434 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
435
436 // A flag must be declared with one of the following types:
437 // bool, intx, uintx, ccstr.
438 // The type "ccstr" is an alias for "const char*" and is used
439 // only in this file, because the macrology requires single-token type names.
440
441 // Note: Diagnostic options not meant for VM tuning or for product modes.
442 // They are to be used for VM quality assurance or field diagnosis
443 // of VM bugs. They are hidden so that users will not be encouraged to
444 // try them as if they were VM ordinary execution options. However, they
445 // are available in the product version of the VM. Under instruction
446 // from support engineers, VM customers can turn them on to collect
447 // diagnostic information about VM problems. To use a VM diagnostic
448 // option, you must first specify +UnlockDiagnosticVMOptions.
449 // (This master switch also affects the behavior of -Xprintflags.)
450 //
451 // experimental flags are in support of features that are not
452 // part of the officially supported product, but are available
453 // for experimenting with. They could, for example, be performance
454 // features that may not have undergone full or rigorous QA, but which may
455 // help performance in some cases and released for experimentation
456 // by the community of users and developers. This flag also allows one to
457 // be able to build a fully supported product that nonetheless also
458 // ships with some unsupported, lightly tested, experimental features.
459 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
460 // UnlockExperimentalVMOptions flag, which allows the control and
461 // modification of the experimental flags.
462 //
463 // Nota bene: neither diagnostic nor experimental options should be used casually,
464 // and they are not supported on production loads, except under explicit
465 // direction from support engineers.
466 //
467 // manageable flags are writeable external product flags.
468 // They are dynamically writeable through the JDK management interface
469 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
470 // These flags are external exported interface (see CCC). The list of
471 // manageable flags can be queried programmatically through the management
472 // interface.
473 //
474 // A flag can be made as "manageable" only if
475 // - the flag is defined in a CCC as an external exported interface.
476 // - the VM implementation supports dynamic setting of the flag.
477 // This implies that the VM must *always* query the flag variable
478 // and not reuse state related to the flag state at any given time.
479 // - you want the flag to be queried programmatically by the customers.
480 //
481 // product_rw flags are writeable internal product flags.
482 // They are like "manageable" flags but for internal/private use.
483 // The list of product_rw flags are internal/private flags which
484 // may be changed/removed in a future release. It can be set
485 // through the management interface to get/set value
486 // when the name of flag is supplied.
487 //
488 // A flag can be made as "product_rw" only if
489 // - the VM implementation supports dynamic setting of the flag.
490 // This implies that the VM must *always* query the flag variable
491 // and not reuse state related to the flag state at any given time.
492 //
493 // Note that when there is a need to support develop flags to be writeable,
494 // it can be done in the same way as product_rw.
495
496 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
497 \
498 lp64_product(bool, UseCompressedOops, false, \
499 "Use 32-bit object references in 64-bit VM. " \
500 "lp64_product means flag is always constant in 32 bit VM") \
501 \
502 lp64_product(bool, UseCompressedClassPointers, false, \
503 "Use 32-bit class pointers in 64-bit VM. " \
504 "lp64_product means flag is always constant in 32 bit VM") \
505 \
506 notproduct(bool, CheckCompressedOops, true, \
507 "Generate checks in encoding/decoding code in debug VM") \
508 \
509 product_pd(uintx, HeapBaseMinAddress, \
510 "OS specific low limit for heap base address") \
511 \
512 diagnostic(bool, PrintCompressedOopsMode, false, \
513 "Print compressed oops base address and encoding mode") \
514 \
515 lp64_product(intx, ObjectAlignmentInBytes, 8, \
516 "Default object alignment in bytes, 8 is minimum") \
517 \
518 product(bool, AssumeMP, false, \
519 "Instruct the VM to assume multiple processors are available") \
520 \
521 /* UseMembar is theoretically a temp flag used for memory barrier \
522 * removal testing. It was supposed to be removed before FCS but has \
523 * been re-added (see 6401008) */ \
524 product_pd(bool, UseMembar, \
525 "(Unstable) Issues membars on thread state transitions") \
526 \
527 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
528 * that don't support it. This will be replaced by processor detection \
529 * logic. \
530 */ \
531 product(bool, UsePPCLWSYNC, true, \
532 "Use lwsync instruction if true, else use slower sync") \
533 \
534 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
535 "Clean the chunk pool asynchronously") \
536 \
537 experimental(bool, AlwaysSafeConstructors, false, \
538 "Force safe construction, as if all fields are final.") \
539 \
540 /* Temporary: See 6948537 */ \
541 experimental(bool, UseMemSetInBOT, true, \
542 "(Unstable) uses memset in BOT updates in GC code") \
543 \
544 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
545 "Enable normal processing of flags relating to field diagnostics")\
546 \
547 experimental(bool, UnlockExperimentalVMOptions, false, \
548 "Enable normal processing of flags relating to experimental " \
549 "features") \
550 \
551 product(bool, JavaMonitorsInStackTrace, true, \
552 "Print information about Java monitor locks when the stacks are" \
553 "dumped") \
554 \
555 product_pd(bool, UseLargePages, \
556 "Use large page memory") \
557 \
558 product_pd(bool, UseLargePagesIndividualAllocation, \
559 "Allocate large pages individually for better affinity") \
560 \
561 develop(bool, LargePagesIndividualAllocationInjectError, false, \
562 "Fail large pages individual allocation") \
563 \
564 product(bool, UseLargePagesInMetaspace, false, \
565 "Use large page memory in metaspace. " \
566 "Only used if UseLargePages is enabled.") \
567 \
568 develop(bool, TracePageSizes, false, \
569 "Trace page size selection and usage") \
570 \
571 product(bool, UseNUMA, false, \
572 "Use NUMA if available") \
573 \
574 product(bool, UseNUMAInterleaving, false, \
575 "Interleave memory across NUMA nodes if available") \
576 \
577 product(uintx, NUMAInterleaveGranularity, 2*M, \
578 "Granularity to use for NUMA interleaving on Windows OS") \
579 \
580 product(bool, ForceNUMA, false, \
581 "Force NUMA optimizations on single-node/UMA systems") \
582 \
583 product(uintx, NUMAChunkResizeWeight, 20, \
584 "Percentage (0-100) used to weight the current sample when " \
585 "computing exponentially decaying average for " \
586 "AdaptiveNUMAChunkSizing") \
587 \
588 product(uintx, NUMASpaceResizeRate, 1*G, \
589 "Do not reallocate more than this amount per collection") \
590 \
591 product(bool, UseAdaptiveNUMAChunkSizing, true, \
592 "Enable adaptive chunk sizing for NUMA") \
593 \
594 product(bool, NUMAStats, false, \
595 "Print NUMA stats in detailed heap information") \
596 \
597 product(uintx, NUMAPageScanRate, 256, \
598 "Maximum number of pages to include in the page scan procedure") \
599 \
600 product_pd(bool, NeedsDeoptSuspend, \
601 "True for register window machines (sparc/ia64)") \
602 \
603 product(intx, UseSSE, 99, \
604 "Highest supported SSE instructions set on x86/x64") \
605 \
606 product(bool, UseAES, false, \
607 "Control whether AES instructions can be used on x86/x64") \
608 \
609 product(uintx, LargePageSizeInBytes, 0, \
610 "Large page size (0 to let VM choose the page size)") \
611 \
612 product(uintx, LargePageHeapSizeThreshold, 128*M, \
613 "Use large pages if maximum heap is at least this big") \
614 \
615 product(bool, ForceTimeHighResolution, false, \
616 "Using high time resolution (for Win32 only)") \
617 \
618 develop(bool, TraceItables, false, \
619 "Trace initialization and use of itables") \
620 \
621 develop(bool, TracePcPatching, false, \
622 "Trace usage of frame::patch_pc") \
623 \
624 develop(bool, TraceJumps, false, \
625 "Trace assembly jumps in thread ring buffer") \
626 \
627 develop(bool, TraceRelocator, false, \
628 "Trace the bytecode relocator") \
629 \
630 develop(bool, TraceLongCompiles, false, \
631 "Print out every time compilation is longer than " \
632 "a given threshold") \
633 \
634 develop(bool, SafepointALot, false, \
635 "Generate a lot of safepoints. This works with " \
636 "GuaranteedSafepointInterval") \
637 \
638 product_pd(bool, BackgroundCompilation, \
639 "A thread requesting compilation is not blocked during " \
640 "compilation") \
641 \
642 product(bool, PrintVMQWaitTime, false, \
643 "Print out the waiting time in VM operation queue") \
644 \
645 develop(bool, NoYieldsInMicrolock, false, \
646 "Disable yields in microlock") \
647 \
648 develop(bool, TraceOopMapGeneration, false, \
649 "Show OopMapGeneration") \
650 \
651 product(bool, MethodFlushing, true, \
652 "Reclamation of zombie and not-entrant methods") \
653 \
654 develop(bool, VerifyStack, false, \
655 "Verify stack of each thread when it is entering a runtime call") \
656 \
657 diagnostic(bool, ForceUnreachable, false, \
658 "Make all non code cache addresses to be unreachable by " \
659 "forcing use of 64bit literal fixups") \
660 \
661 notproduct(bool, StressDerivedPointers, false, \
662 "Force scavenge when a derived pointer is detected on stack " \
663 "after rtm call") \
664 \
665 develop(bool, TraceDerivedPointers, false, \
666 "Trace traversal of derived pointers on stack") \
667 \
668 notproduct(bool, TraceCodeBlobStacks, false, \
669 "Trace stack-walk of codeblobs") \
670 \
671 product(bool, PrintJNIResolving, false, \
672 "Used to implement -v:jni") \
673 \
674 notproduct(bool, PrintRewrites, false, \
675 "Print methods that are being rewritten") \
676 \
677 product(bool, UseInlineCaches, true, \
678 "Use Inline Caches for virtual calls ") \
679 \
680 develop(bool, InlineArrayCopy, true, \
681 "Inline arraycopy native that is known to be part of " \
682 "base library DLL") \
683 \
684 develop(bool, InlineObjectHash, true, \
685 "Inline Object::hashCode() native that is known to be part " \
686 "of base library DLL") \
687 \
688 develop(bool, InlineNatives, true, \
689 "Inline natives that are known to be part of base library DLL") \
690 \
691 develop(bool, InlineMathNatives, true, \
692 "Inline SinD, CosD, etc.") \
693 \
694 develop(bool, InlineClassNatives, true, \
695 "Inline Class.isInstance, etc") \
696 \
697 develop(bool, InlineThreadNatives, true, \
698 "Inline Thread.currentThread, etc") \
699 \
700 develop(bool, InlineUnsafeOps, true, \
701 "Inline memory ops (native methods) from sun.misc.Unsafe") \
702 \
703 product(bool, CriticalJNINatives, true, \
704 "Check for critical JNI entry points") \
705 \
706 notproduct(bool, StressCriticalJNINatives, false, \
707 "Exercise register saving code in critical natives") \
708 \
709 product(bool, UseSSE42Intrinsics, false, \
710 "SSE4.2 versions of intrinsics") \
711 \
712 product(bool, UseAESIntrinsics, false, \
713 "Use intrinsics for AES versions of crypto") \
714 \
715 product(bool, UseCRC32Intrinsics, false, \
716 "use intrinsics for java.util.zip.CRC32") \
717 \
718 develop(bool, TraceCallFixup, false, \
719 "Trace all call fixups") \
720 \
721 develop(bool, DeoptimizeALot, false, \
722 "Deoptimize at every exit from the runtime system") \
723 \
724 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
725 "A comma separated list of bcis to deoptimize at") \
726 \
727 product(bool, DeoptimizeRandom, false, \
728 "Deoptimize random frames on random exit from the runtime system")\
729 \
730 notproduct(bool, ZombieALot, false, \
731 "Create zombies (non-entrant) at exit from the runtime system") \
732 \
733 product(bool, UnlinkSymbolsALot, false, \
734 "Unlink unreferenced symbols from the symbol table at safepoints")\
735 \
736 notproduct(bool, WalkStackALot, false, \
737 "Trace stack (no print) at every exit from the runtime system") \
738 \
739 product(bool, Debugging, false, \
740 "Set when executing debug methods in debug.cpp " \
741 "(to prevent triggering assertions)") \
742 \
743 notproduct(bool, StrictSafepointChecks, trueInDebug, \
744 "Enable strict checks that safepoints cannot happen for threads " \
745 "that use No_Safepoint_Verifier") \
746 \
747 notproduct(bool, VerifyLastFrame, false, \
748 "Verify oops on last frame on entry to VM") \
749 \
750 develop(bool, TraceHandleAllocation, false, \
751 "Print out warnings when suspiciously many handles are allocated")\
752 \
753 product(bool, UseCompilerSafepoints, true, \
754 "Stop at safepoints in compiled code") \
755 \
756 product(bool, FailOverToOldVerifier, true, \
757 "Fail over to old verifier when split verifier fails") \
758 \
759 develop(bool, ShowSafepointMsgs, false, \
760 "Show message about safepoint synchronization") \
761 \
762 product(bool, SafepointTimeout, false, \
763 "Time out and warn or fail after SafepointTimeoutDelay " \
764 "milliseconds if failed to reach safepoint") \
765 \
766 develop(bool, DieOnSafepointTimeout, false, \
767 "Die upon failure to reach safepoint (see SafepointTimeout)") \
768 \
769 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
770 /* typically, at most a few retries are needed */ \
771 product(intx, SuspendRetryCount, 50, \
772 "Maximum retry count for an external suspend request") \
773 \
774 product(intx, SuspendRetryDelay, 5, \
775 "Milliseconds to delay per retry (* current_retry_count)") \
776 \
777 product(bool, AssertOnSuspendWaitFailure, false, \
778 "Assert/Guarantee on external suspend wait failure") \
779 \
780 product(bool, TraceSuspendWaitFailures, false, \
781 "Trace external suspend wait failures") \
782 \
783 product(bool, MaxFDLimit, true, \
784 "Bump the number of file descriptors to maximum in Solaris") \
785 \
786 diagnostic(bool, LogEvents, true, \
787 "Enable the various ring buffer event logs") \
788 \
789 diagnostic(uintx, LogEventsBufferEntries, 10, \
790 "Number of ring buffer event logs") \
791 \
792 product(bool, BytecodeVerificationRemote, true, \
793 "Enable the Java bytecode verifier for remote classes") \
794 \
795 product(bool, BytecodeVerificationLocal, false, \
796 "Enable the Java bytecode verifier for local classes") \
797 \
798 develop(bool, ForceFloatExceptions, trueInDebug, \
799 "Force exceptions on FP stack under/overflow") \
800 \
801 develop(bool, VerifyStackAtCalls, false, \
802 "Verify that the stack pointer is unchanged after calls") \
803 \
804 develop(bool, TraceJavaAssertions, false, \
805 "Trace java language assertions") \
806 \
807 notproduct(bool, CheckAssertionStatusDirectives, false, \
808 "Temporary - see javaClasses.cpp") \
809 \
810 notproduct(bool, PrintMallocFree, false, \
811 "Trace calls to C heap malloc/free allocation") \
812 \
813 product(bool, PrintOopAddress, false, \
814 "Always print the location of the oop") \
815 \
816 notproduct(bool, VerifyCodeCache, false, \
817 "Verify code cache on memory allocation/deallocation") \
818 \
819 develop(bool, ZapDeadCompiledLocals, false, \
820 "Zap dead locals in compiler frames") \
821 \
822 notproduct(bool, ZapDeadLocalsOld, false, \
823 "Zap dead locals (old version, zaps all frames when " \
824 "entering the VM") \
825 \
826 notproduct(bool, CheckOopishValues, false, \
827 "Warn if value contains oop (requires ZapDeadLocals)") \
828 \
829 develop(bool, UseMallocOnly, false, \
830 "Use only malloc/free for allocation (no resource area/arena)") \
831 \
832 develop(bool, PrintMalloc, false, \
833 "Print all malloc/free calls") \
834 \
835 develop(bool, PrintMallocStatistics, false, \
836 "Print malloc/free statistics") \
837 \
838 develop(bool, ZapResourceArea, trueInDebug, \
839 "Zap freed resource/arena space with 0xABABABAB") \
840 \
841 notproduct(bool, ZapVMHandleArea, trueInDebug, \
842 "Zap freed VM handle space with 0xBCBCBCBC") \
843 \
844 develop(bool, ZapJNIHandleArea, trueInDebug, \
845 "Zap freed JNI handle space with 0xFEFEFEFE") \
846 \
847 notproduct(bool, ZapStackSegments, trueInDebug, \
848 "Zap allocated/freed stack segments with 0xFADFADED") \
849 \
850 develop(bool, ZapUnusedHeapArea, trueInDebug, \
851 "Zap unused heap space with 0xBAADBABE") \
852 \
853 develop(bool, TraceZapUnusedHeapArea, false, \
854 "Trace zapping of unused heap space") \
855 \
856 develop(bool, CheckZapUnusedHeapArea, false, \
857 "Check zapping of unused heap space") \
858 \
859 develop(bool, ZapFillerObjects, trueInDebug, \
860 "Zap filler objects with 0xDEAFBABE") \
861 \
862 develop(bool, PrintVMMessages, true, \
863 "Print VM messages on console") \
864 \
865 product(bool, PrintGCApplicationConcurrentTime, false, \
866 "Print the time the application has been running") \
867 \
868 product(bool, PrintGCApplicationStoppedTime, false, \
869 "Print the time the application has been stopped") \
870 \
871 diagnostic(bool, VerboseVerification, false, \
872 "Display detailed verification details") \
873 \
874 notproduct(uintx, ErrorHandlerTest, 0, \
875 "If > 0, provokes an error after VM initialization; the value " \
876 "determines which error to provoke. See test_error_handler() " \
877 "in debug.cpp.") \
878 \
879 develop(bool, Verbose, false, \
880 "Print additional debugging information from other modes") \
881 \
882 develop(bool, PrintMiscellaneous, false, \
883 "Print uncategorized debugging information (requires +Verbose)") \
884 \
885 develop(bool, WizardMode, false, \
886 "Print much more debugging information") \
887 \
888 product(bool, ShowMessageBoxOnError, false, \
889 "Keep process alive on VM fatal error") \
890 \
891 product(bool, CreateMinidumpOnCrash, false, \
892 "Create minidump on VM fatal error") \
893 \
894 product_pd(bool, UseOSErrorReporting, \
895 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
896 \
897 product(bool, SuppressFatalErrorMessage, false, \
898 "Report NO fatal error message (avoid deadlock)") \
899 \
900 product(ccstrlist, OnError, "", \
901 "Run user-defined commands on fatal error; see VMError.cpp " \
902 "for examples") \
903 \
904 product(ccstrlist, OnOutOfMemoryError, "", \
905 "Run user-defined commands on first java.lang.OutOfMemoryError") \
906 \
907 manageable(bool, HeapDumpBeforeFullGC, false, \
908 "Dump heap to file before any major stop-the-world GC") \
909 \
910 manageable(bool, HeapDumpAfterFullGC, false, \
911 "Dump heap to file after any major stop-the-world GC") \
912 \
913 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
914 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
915 \
916 manageable(ccstr, HeapDumpPath, NULL, \
917 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
918 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
919 "in the working directory)") \
920 \
921 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
922 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
923 "when the heap usage is larger than this") \
924 \
925 develop(uintx, HeapDumpSegmentSize, 1*G, \
926 "Approximate segment size when generating a segmented heap dump") \
927 \
928 develop(bool, BreakAtWarning, false, \
929 "Execute breakpoint upon encountering VM warning") \
930 \
931 develop(bool, TraceVMOperation, false, \
932 "Trace VM operations") \
933 \
934 develop(bool, UseFakeTimers, false, \
935 "Tell whether the VM should use system time or a fake timer") \
936 \
937 product(ccstr, NativeMemoryTracking, "off", \
938 "Native memory tracking options") \
939 \
940 diagnostic(bool, PrintNMTStatistics, false, \
941 "Print native memory tracking summary data if it is on") \
942 \
943 diagnostic(bool, AutoShutdownNMT, true, \
944 "Automatically shutdown native memory tracking under stress " \
945 "situations. When set to false, native memory tracking tries to " \
946 "stay alive at the expense of JVM performance") \
947 \
948 diagnostic(bool, LogCompilation, false, \
949 "Log compilation activity in detail to LogFile") \
950 \
951 product(bool, PrintCompilation, false, \
952 "Print compilations") \
953 \
954 diagnostic(bool, TraceNMethodInstalls, false, \
955 "Trace nmethod installation") \
956 \
957 diagnostic(intx, ScavengeRootsInCode, 2, \
958 "0: do not allow scavengable oops in the code cache; " \
959 "1: allow scavenging from the code cache; " \
960 "2: emit as many constants as the compiler can see") \
961 \
962 product(bool, AlwaysRestoreFPU, false, \
963 "Restore the FPU control word after every JNI call (expensive)") \
964 \
965 diagnostic(bool, PrintCompilation2, false, \
966 "Print additional statistics per compilation") \
967 \
968 diagnostic(bool, PrintAdapterHandlers, false, \
969 "Print code generated for i2c/c2i adapters") \
970 \
971 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
972 "Verify that i2c/c2i adapters are called properly") \
973 \
974 develop(bool, VerifyAdapterSharing, false, \
975 "Verify that the code for shared adapters is the equivalent") \
976 \
977 diagnostic(bool, PrintAssembly, false, \
978 "Print assembly code (using external disassembler.so)") \
979 \
980 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
981 "Print options string passed to disassembler.so") \
982 \
983 diagnostic(bool, PrintNMethods, false, \
984 "Print assembly code for nmethods when generated") \
985 \
986 diagnostic(bool, PrintNativeNMethods, false, \
987 "Print assembly code for native nmethods when generated") \
988 \
989 develop(bool, PrintDebugInfo, false, \
990 "Print debug information for all nmethods when generated") \
991 \
992 develop(bool, PrintRelocations, false, \
993 "Print relocation information for all nmethods when generated") \
994 \
995 develop(bool, PrintDependencies, false, \
996 "Print dependency information for all nmethods when generated") \
997 \
998 develop(bool, PrintExceptionHandlers, false, \
999 "Print exception handler tables for all nmethods when generated") \
1000 \
1001 develop(bool, StressCompiledExceptionHandlers, false, \
1002 "Exercise compiled exception handlers") \
1003 \
1004 develop(bool, InterceptOSException, false, \
1005 "Start debugger when an implicit OS (e.g. NULL) " \
1006 "exception happens") \
1007 \
1008 product(bool, PrintCodeCache, false, \
1009 "Print the code cache memory usage when exiting") \
1010 \
1011 develop(bool, PrintCodeCache2, false, \
1012 "Print detailed usage information on the code cache when exiting")\
1013 \
1014 product(bool, PrintCodeCacheOnCompilation, false, \
1015 "Print the code cache memory usage each time a method is " \
1016 "compiled") \
1017 \
1018 diagnostic(bool, PrintStubCode, false, \
1019 "Print generated stub code") \
1020 \
1021 product(bool, StackTraceInThrowable, true, \
1022 "Collect backtrace in throwable when exception happens") \
1023 \
1024 product(bool, OmitStackTraceInFastThrow, true, \
1025 "Omit backtraces for some 'hot' exceptions in optimized code") \
1026 \
1027 product(bool, ProfilerPrintByteCodeStatistics, false, \
1028 "Print bytecode statistics when dumping profiler output") \
1029 \
1030 product(bool, ProfilerRecordPC, false, \
1031 "Collect ticks for each 16 byte interval of compiled code") \
1032 \
1033 product(bool, ProfileVM, false, \
1034 "Profile ticks that fall within VM (either in the VM Thread " \
1035 "or VM code called through stubs)") \
1036 \
1037 product(bool, ProfileIntervals, false, \
1038 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1039 \
1040 notproduct(bool, ProfilerCheckIntervals, false, \
1041 "Collect and print information on spacing of profiler ticks") \
1042 \
1043 develop(bool, PrintJVMWarnings, false, \
1044 "Print warnings for unimplemented JVM functions") \
1045 \
1046 product(bool, PrintWarnings, true, \
1047 "Print JVM warnings to output stream") \
1048 \
1049 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1050 "Print warnings for stalled SpinLocks") \
1051 \
1052 product(bool, RegisterFinalizersAtInit, true, \
1053 "Register finalizable objects at end of Object.<init> or " \
1054 "after allocation") \
1055 \
1056 develop(bool, RegisterReferences, true, \
1057 "Tell whether the VM should register soft/weak/final/phantom " \
1058 "references") \
1059 \
1060 develop(bool, IgnoreRewrites, false, \
1061 "Suppress rewrites of bytecodes in the oopmap generator. " \
1062 "This is unsafe!") \
1063 \
1064 develop(bool, PrintCodeCacheExtension, false, \
1065 "Print extension of code cache") \
1066 \
1067 develop(bool, UsePrivilegedStack, true, \
1068 "Enable the security JVM functions") \
1069 \
1070 develop(bool, ProtectionDomainVerification, true, \
1071 "Verify protection domain before resolution in system dictionary")\
1072 \
1073 product(bool, ClassUnloading, true, \
1074 "Do unloading of classes") \
1075 \
1076 develop(bool, DisableStartThread, false, \
1077 "Disable starting of additional Java threads " \
1078 "(for debugging only)") \
1079 \
1080 develop(bool, MemProfiling, false, \
1081 "Write memory usage profiling to log file") \
1082 \
1083 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1084 "Print the system dictionary at exit") \
1085 \
1086 experimental(intx, PredictedLoadedClassCount, 0, \
1087 "Experimental: Tune loaded class cache starting size") \
1088 \
1089 diagnostic(bool, UnsyncloadClass, false, \
1090 "Unstable: VM calls loadClass unsynchronized. Custom " \
1091 "class loader must call VM synchronized for findClass " \
1092 "and defineClass.") \
1093 \
1094 product(bool, AlwaysLockClassLoader, false, \
1095 "Require the VM to acquire the class loader lock before calling " \
1096 "loadClass() even for class loaders registering " \
1097 "as parallel capable") \
1098 \
1099 product(bool, AllowParallelDefineClass, false, \
1100 "Allow parallel defineClass requests for class loaders " \
1101 "registering as parallel capable") \
1102 \
1103 product(bool, MustCallLoadClassInternal, false, \
1104 "Call loadClassInternal() rather than loadClass()") \
1105 \
1106 product_pd(bool, DontYieldALot, \
1107 "Throw away obvious excess yield calls (for Solaris only)") \
1108 \
1109 product_pd(bool, ConvertSleepToYield, \
1110 "Convert sleep(0) to thread yield " \
1111 "(may be off for Solaris to improve GUI)") \
1112 \
1113 product(bool, ConvertYieldToSleep, false, \
1114 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1115 "behavior (Solaris only)") \
1116 \
1117 product(bool, UseBoundThreads, true, \
1118 "Bind user level threads to kernel threads (for Solaris only)") \
1119 \
1120 develop(bool, UseDetachedThreads, true, \
1121 "Use detached threads that are recycled upon termination " \
1122 "(for Solaris only)") \
1123 \
1124 product(bool, UseLWPSynchronization, true, \
1125 "Use LWP-based instead of libthread-based synchronization " \
1126 "(SPARC only)") \
1127 \
1128 product(ccstr, SyncKnobs, NULL, \
1129 "(Unstable) Various monitor synchronization tunables") \
1130 \
1131 product(intx, EmitSync, 0, \
1132 "(Unsafe, Unstable) " \
1133 "Control emission of inline sync fast-path code") \
1134 \
1135 product(intx, MonitorBound, 0, "Bound Monitor population") \
1136 \
1137 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1138 \
1139 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1140 \
1141 product(intx, SyncVerbose, 0, "(Unstable)") \
1142 \
1143 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1144 \
1145 product(intx, hashCode, 5, \
1146 "(Unstable) select hashCode generation algorithm") \
1147 \
1148 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1149 "(Unstable, Linux-specific) " \
1150 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1151 \
1152 product(bool, FilterSpuriousWakeups, true, \
1153 "Prevent spurious or premature wakeups from object.wait " \
1154 "(Solaris only)") \
1155 \
1156 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1157 \
1158 product(intx, NativeMonitorFlags, 0, "(Unstable)") \
1159 \
1160 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1161 \
1162 develop(bool, UsePthreads, false, \
1163 "Use pthread-based instead of libthread-based synchronization " \
1164 "(SPARC only)") \
1165 \
1166 product(bool, AdjustConcurrency, false, \
1167 "Call thr_setconcurrency at thread creation time to avoid " \
1168 "LWP starvation on MP systems (for Solaris Only)") \
1169 \
1170 product(bool, ReduceSignalUsage, false, \
1171 "Reduce the use of OS signals in Java and/or the VM") \
1172 \
1173 develop_pd(bool, ShareVtableStubs, \
1174 "Share vtable stubs (smaller code but worse branch prediction") \
1175 \
1176 develop(bool, LoadLineNumberTables, true, \
1177 "Tell whether the class file parser loads line number tables") \
1178 \
1179 develop(bool, LoadLocalVariableTables, true, \
1180 "Tell whether the class file parser loads local variable tables") \
1181 \
1182 develop(bool, LoadLocalVariableTypeTables, true, \
1183 "Tell whether the class file parser loads local variable type" \
1184 "tables") \
1185 \
1186 product(bool, AllowUserSignalHandlers, false, \
1187 "Do not complain if the application installs signal handlers " \
1188 "(Solaris & Linux only)") \
1189 \
1190 product(bool, UseSignalChaining, true, \
1191 "Use signal-chaining to invoke signal handlers installed " \
1192 "by the application (Solaris & Linux only)") \
1193 \
1194 product(bool, UseAltSigs, false, \
1195 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1196 "internal signals (Solaris only)") \
1197 \
1198 product(bool, AllowJNIEnvProxy, false, \
1199 "Allow JNIEnv proxies for jdbx") \
1200 \
1201 product(bool, JNIDetachReleasesMonitors, true, \
1202 "JNI DetachCurrentThread releases monitors owned by thread") \
1203 \
1204 product(bool, RestoreMXCSROnJNICalls, false, \
1205 "Restore MXCSR when returning from JNI calls") \
1206 \
1207 product(bool, CheckJNICalls, false, \
1208 "Verify all arguments to JNI calls") \
1209 \
1210 product(bool, UseFastJNIAccessors, true, \
1211 "Use optimized versions of Get<Primitive>Field") \
1212 \
1213 product(bool, EagerXrunInit, false, \
1214 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1215 "but not all -Xrun libraries may support the state of the VM " \
1216 "at this time") \
1217 \
1218 product(bool, PreserveAllAnnotations, false, \
1219 "Preserve RuntimeInvisibleAnnotations as well " \
1220 "as RuntimeVisibleAnnotations") \
1221 \
1222 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1223 "Number of OutOfMemoryErrors preallocated with backtrace") \
1224 \
1225 product(bool, LazyBootClassLoader, true, \
1226 "Enable/disable lazy opening of boot class path entries") \
1227 \
1228 product(bool, UseXMMForArrayCopy, false, \
1229 "Use SSE2 MOVQ instruction for Arraycopy") \
1230 \
1231 product(intx, FieldsAllocationStyle, 1, \
1232 "0 - type based with oops first, 1 - with oops last, " \
1233 "2 - oops in super and sub classes are together") \
1234 \
1235 product(bool, CompactFields, true, \
1236 "Allocate nonstatic fields in gaps between previous fields") \
1237 \
1238 notproduct(bool, PrintFieldLayout, false, \
1239 "Print field layout for each class") \
1240 \
1241 product(intx, ContendedPaddingWidth, 128, \
1242 "How many bytes to pad the fields/classes marked @Contended with")\
1243 \
1244 product(bool, EnableContended, true, \
1245 "Enable @Contended annotation support") \
1246 \
1247 product(bool, RestrictContended, true, \
1248 "Restrict @Contended to trusted classes") \
1249 \
1250 product(bool, UseBiasedLocking, true, \
1251 "Enable biased locking in JVM") \
1252 \
1253 product(intx, BiasedLockingStartupDelay, 4000, \
1254 "Number of milliseconds to wait before enabling biased locking") \
1255 \
1256 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1257 "Print statistics of biased locking in JVM") \
1258 \
1259 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1260 "Threshold of number of revocations per type to try to " \
1261 "rebias all objects in the heap of that type") \
1262 \
1263 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1264 "Threshold of number of revocations per type to permanently " \
1265 "revoke biases of all objects in the heap of that type") \
1266 \
1267 product(intx, BiasedLockingDecayTime, 25000, \
1268 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1269 "type after previous bulk rebias") \
1270 \
1271 /* tracing */ \
1272 \
1273 notproduct(bool, TraceRuntimeCalls, false, \
1274 "Trace run-time calls") \
1275 \
1276 develop(bool, TraceJNICalls, false, \
1277 "Trace JNI calls") \
1278 \
1279 develop(bool, StressRewriter, false, \
1280 "Stress linktime bytecode rewriting") \
1281 \
1282 notproduct(bool, TraceJVMCalls, false, \
1283 "Trace JVM calls") \
1284 \
1285 product(ccstr, TraceJVMTI, NULL, \
1286 "Trace flags for JVMTI functions and events") \
1287 \
1288 /* This option can change an EMCP method into an obsolete method. */ \
1289 /* This can affect tests that except specific methods to be EMCP. */ \
1290 /* This option should be used with caution. */ \
1291 product(bool, StressLdcRewrite, false, \
1292 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1293 \
1294 product(intx, TraceRedefineClasses, 0, \
1295 "Trace level for JVMTI RedefineClasses") \
1296 \
1297 develop(bool, StressMethodComparator, false, \
1298 "Run the MethodComparator on all loaded methods") \
1299 \
1300 /* change to false by default sometime after Mustang */ \
1301 product(bool, VerifyMergedCPBytecodes, true, \
1302 "Verify bytecodes after RedefineClasses constant pool merging") \
1303 \
1304 develop(bool, TraceJNIHandleAllocation, false, \
1305 "Trace allocation/deallocation of JNI handle blocks") \
1306 \
1307 develop(bool, TraceThreadEvents, false, \
1308 "Trace all thread events") \
1309 \
1310 develop(bool, TraceBytecodes, false, \
1311 "Trace bytecode execution") \
1312 \
1313 develop(bool, TraceClassInitialization, false, \
1314 "Trace class initialization") \
1315 \
1316 develop(bool, TraceExceptions, false, \
1317 "Trace exceptions") \
1318 \
1319 develop(bool, TraceICs, false, \
1320 "Trace inline cache changes") \
1321 \
1322 notproduct(bool, TraceInvocationCounterOverflow, false, \
1323 "Trace method invocation counter overflow") \
1324 \
1325 develop(bool, TraceInlineCacheClearing, false, \
1326 "Trace clearing of inline caches in nmethods") \
1327 \
1328 develop(bool, TraceDependencies, false, \
1329 "Trace dependencies") \
1330 \
1331 develop(bool, VerifyDependencies, trueInDebug, \
1332 "Exercise and verify the compilation dependency mechanism") \
1333 \
1334 develop(bool, TraceNewOopMapGeneration, false, \
1335 "Trace OopMapGeneration") \
1336 \
1337 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1338 "Trace OopMapGeneration: print detailed cell states") \
1339 \
1340 develop(bool, TimeOopMap, false, \
1341 "Time calls to GenerateOopMap::compute_map() in sum") \
1342 \
1343 develop(bool, TimeOopMap2, false, \
1344 "Time calls to GenerateOopMap::compute_map() individually") \
1345 \
1346 develop(bool, TraceMonitorMismatch, false, \
1347 "Trace monitor matching failures during OopMapGeneration") \
1348 \
1349 develop(bool, TraceOopMapRewrites, false, \
1350 "Trace rewriting of method oops during oop map generation") \
1351 \
1352 develop(bool, TraceSafepoint, false, \
1353 "Trace safepoint operations") \
1354 \
1355 develop(bool, TraceICBuffer, false, \
1356 "Trace usage of IC buffer") \
1357 \
1358 develop(bool, TraceCompiledIC, false, \
1359 "Trace changes of compiled IC") \
1360 \
1361 notproduct(bool, TraceZapDeadLocals, false, \
1362 "Trace zapping dead locals") \
1363 \
1364 develop(bool, TraceStartupTime, false, \
1365 "Trace setup time") \
1366 \
1367 develop(bool, TraceProtectionDomainVerification, false, \
1368 "Trace protection domain verification") \
1369 \
1370 develop(bool, TraceClearedExceptions, false, \
1371 "Print when an exception is forcibly cleared") \
1372 \
1373 product(bool, TraceClassResolution, false, \
1374 "Trace all constant pool resolutions (for debugging)") \
1375 \
1376 product(bool, TraceBiasedLocking, false, \
1377 "Trace biased locking in JVM") \
1378 \
1379 product(bool, TraceMonitorInflation, false, \
1380 "Trace monitor inflation in JVM") \
1381 \
1382 /* gc */ \
1383 \
1384 product(bool, UseSerialGC, false, \
1385 "Use the Serial garbage collector") \
1386 \
1387 product(bool, UseG1GC, false, \
1388 "Use the Garbage-First garbage collector") \
1389 \
1390 product(bool, UseParallelGC, false, \
1391 "Use the Parallel Scavenge garbage collector") \
1392 \
1393 product(bool, UseParallelOldGC, false, \
1394 "Use the Parallel Old garbage collector") \
1395 \
1396 product(uintx, HeapMaximumCompactionInterval, 20, \
1397 "How often should we maximally compact the heap (not allowing " \
1398 "any dead space)") \
1399 \
1400 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1401 "The collection count for the first maximum compaction") \
1402 \
1403 product(bool, UseMaximumCompactionOnSystemGC, true, \
1404 "Use maximum compaction in the Parallel Old garbage collector " \
1405 "for a system GC") \
1406 \
1407 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1408 "The mean used by the parallel compact dead wood " \
1409 "limiter (a number between 0-100)") \
1410 \
1411 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1412 "The standard deviation used by the parallel compact dead wood " \
1413 "limiter (a number between 0-100)") \
1414 \
1415 product(uintx, ParallelGCThreads, 0, \
1416 "Number of parallel threads parallel gc will use") \
1417 \
1418 product(bool, UseDynamicNumberOfGCThreads, false, \
1419 "Dynamically choose the number of parallel threads " \
1420 "parallel gc will use") \
1421 \
1422 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1423 "Force dynamic selection of the number of " \
1424 "parallel threads parallel gc will use to aid debugging") \
1425 \
1426 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1427 "Size of heap (bytes) per GC thread used in calculating the " \
1428 "number of GC threads") \
1429 \
1430 product(bool, TraceDynamicGCThreads, false, \
1431 "Trace the dynamic GC thread usage") \
1432 \
1433 develop(bool, ParallelOldGCSplitALot, false, \
1434 "Provoke splitting (copying data from a young gen space to " \
1435 "multiple destination spaces)") \
1436 \
1437 develop(uintx, ParallelOldGCSplitInterval, 3, \
1438 "How often to provoke splitting a young gen space") \
1439 \
1440 product(uintx, ConcGCThreads, 0, \
1441 "Number of threads concurrent gc will use") \
1442 \
1443 product(uintx, YoungPLABSize, 4096, \
1444 "Size of young gen promotion LAB's (in HeapWords)") \
1445 \
1446 product(uintx, OldPLABSize, 1024, \
1447 "Size of old gen promotion LAB's (in HeapWords)") \
1448 \
1449 product(uintx, GCTaskTimeStampEntries, 200, \
1450 "Number of time stamp entries per gc worker thread") \
1451 \
1452 product(bool, AlwaysTenure, false, \
1453 "Always tenure objects in eden (ParallelGC only)") \
1454 \
1455 product(bool, NeverTenure, false, \
1456 "Never tenure objects in eden, may tenure on overflow " \
1457 "(ParallelGC only)") \
1458 \
1459 product(bool, ScavengeBeforeFullGC, true, \
1460 "Scavenge youngest generation before each full GC, " \
1461 "used with UseParallelGC") \
1462 \
1463 develop(bool, ScavengeWithObjectsInToSpace, false, \
1464 "Allow scavenges to occur when to-space contains objects") \
1465 \
1466 product(bool, UseConcMarkSweepGC, false, \
1467 "Use Concurrent Mark-Sweep GC in the old generation") \
1468 \
1469 product(bool, ExplicitGCInvokesConcurrent, false, \
1470 "A System.gc() request invokes a concurrent collection; " \
1471 "(effective only when UseConcMarkSweepGC)") \
1472 \
1473 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1474 "A System.gc() request invokes a concurrent collection and " \
1475 "also unloads classes during such a concurrent gc cycle " \
1476 "(effective only when UseConcMarkSweepGC)") \
1477 \
1478 product(bool, GCLockerInvokesConcurrent, false, \
1479 "The exit of a JNI critical section necessitating a scavenge, " \
1480 "also kicks off a background concurrent collection") \
1481 \
1482 product(uintx, GCLockerEdenExpansionPercent, 5, \
1483 "How much the GC can expand the eden by while the GC locker " \
1484 "is active (as a percentage)") \
1485 \
1486 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1487 "Number of times to retry allocations when " \
1488 "blocked by the GC locker") \
1489 \
1490 develop(bool, UseCMSAdaptiveFreeLists, true, \
1491 "Use adaptive free lists in the CMS generation") \
1492 \
1493 develop(bool, UseAsyncConcMarkSweepGC, true, \
1494 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1495 \
1496 develop(bool, RotateCMSCollectionTypes, false, \
1497 "Rotate the CMS collections among concurrent and STW") \
1498 \
1499 product(bool, UseCMSBestFit, true, \
1500 "Use CMS best fit allocation strategy") \
1501 \
1502 product(bool, UseCMSCollectionPassing, true, \
1503 "Use passing of collection from background to foreground") \
1504 \
1505 product(bool, UseParNewGC, false, \
1506 "Use parallel threads in the new generation") \
1507 \
1508 product(bool, ParallelGCVerbose, false, \
1509 "Verbose output for parallel gc") \
1510 \
1511 product(uintx, ParallelGCBufferWastePct, 10, \
1512 "Wasted fraction of parallel allocation buffer") \
1513 \
1514 diagnostic(bool, ParallelGCRetainPLAB, false, \
1515 "Retain parallel allocation buffers across scavenges; " \
1516 "it is disabled because this currently conflicts with " \
1517 "parallel card scanning under certain conditions.") \
1518 \
1519 product(uintx, TargetPLABWastePct, 10, \
1520 "Target wasted space in last buffer as percent of overall " \
1521 "allocation") \
1522 \
1523 product(uintx, PLABWeight, 75, \
1524 "Percentage (0-100) used to weight the current sample when " \
1525 "computing exponentially decaying average for ResizePLAB") \
1526 \
1527 product(bool, ResizePLAB, true, \
1528 "Dynamically resize (survivor space) promotion LAB's") \
1529 \
1530 product(bool, PrintPLAB, false, \
1531 "Print (survivor space) promotion LAB's sizing decisions") \
1532 \
1533 product(intx, ParGCArrayScanChunk, 50, \
1534 "Scan a subset of object array and push remainder, if array is " \
1535 "bigger than this") \
1536 \
1537 product(bool, ParGCUseLocalOverflow, false, \
1538 "Instead of a global overflow list, use local overflow stacks") \
1539 \
1540 product(bool, ParGCTrimOverflow, true, \
1541 "Eagerly trim the local overflow lists " \
1542 "(when ParGCUseLocalOverflow)") \
1543 \
1544 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1545 "Simulate work queue overflow in ParNew") \
1546 \
1547 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1548 "An `interval' counter that determines how frequently " \
1549 "we simulate overflow; a smaller number increases frequency") \
1550 \
1551 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1552 "The desired number of objects to claim from the overflow list") \
1553 \
1554 diagnostic(uintx, ParGCStridesPerThread, 2, \
1555 "The number of strides per worker thread that we divide up the " \
1556 "card table scanning work into") \
1557 \
1558 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1559 "The number of cards in each chunk of the parallel chunks used " \
1560 "during card table scanning") \
1561 \
1562 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1563 "Number of blocks to attempt to claim when refilling CMS LAB's " \
1564 "for parallel GC") \
1565 \
1566 product(uintx, OldPLABWeight, 50, \
1567 "Percentage (0-100) used to weight the current sample when " \
1568 "computing exponentially decaying average for resizing " \
1569 "CMSParPromoteBlocksToClaim") \
1570 \
1571 product(bool, ResizeOldPLAB, true, \
1572 "Dynamically resize (old gen) promotion LAB's") \
1573 \
1574 product(bool, PrintOldPLAB, false, \
1575 "Print (old gen) promotion LAB's sizing decisions") \
1576 \
1577 product(uintx, CMSOldPLABMin, 16, \
1578 "Minimum size of CMS gen promotion LAB caches per worker " \
1579 "per block size") \
1580 \
1581 product(uintx, CMSOldPLABMax, 1024, \
1582 "Maximum size of CMS gen promotion LAB caches per worker " \
1583 "per block size") \
1584 \
1585 product(uintx, CMSOldPLABNumRefills, 4, \
1586 "Nominal number of refills of CMS gen promotion LAB cache " \
1587 "per worker per block size") \
1588 \
1589 product(bool, CMSOldPLABResizeQuicker, false, \
1590 "React on-the-fly during a scavenge to a sudden " \
1591 "change in block demand rate") \
1592 \
1593 product(uintx, CMSOldPLABToleranceFactor, 4, \
1594 "The tolerance of the phase-change detector for on-the-fly " \
1595 "PLAB resizing during a scavenge") \
1596 \
1597 product(uintx, CMSOldPLABReactivityFactor, 2, \
1598 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1599 "during a scavenge") \
1600 \
1601 product(bool, AlwaysPreTouch, false, \
1602 "Force all freshly committed pages to be pre-touched") \
1603 \
1604 product_pd(uintx, CMSYoungGenPerWorker, \
1605 "The maximum size of young gen chosen by default per GC worker " \
1606 "thread available") \
1607 \
1608 product(bool, CMSIncrementalMode, false, \
1609 "Whether CMS GC should operate in \"incremental\" mode") \
1610 \
1611 product(uintx, CMSIncrementalDutyCycle, 10, \
1612 "Percentage (0-100) of CMS incremental mode duty cycle. If " \
1613 "CMSIncrementalPacing is enabled, then this is just the initial " \
1614 "value.") \
1615 \
1616 product(bool, CMSIncrementalPacing, true, \
1617 "Whether the CMS incremental mode duty cycle should be " \
1618 "automatically adjusted") \
1619 \
1620 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1621 "Minimum percentage (0-100) of the CMS incremental duty cycle " \
1622 "used when CMSIncrementalPacing is enabled") \
1623 \
1624 product(uintx, CMSIncrementalSafetyFactor, 10, \
1625 "Percentage (0-100) used to add conservatism when computing the " \
1626 "duty cycle") \
1627 \
1628 product(uintx, CMSIncrementalOffset, 0, \
1629 "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1630 "is shifted to the right within the period between young GCs") \
1631 \
1632 product(uintx, CMSExpAvgFactor, 50, \
1633 "Percentage (0-100) used to weight the current sample when " \
1634 "computing exponential averages for CMS statistics") \
1635 \
1636 product(uintx, CMS_FLSWeight, 75, \
1637 "Percentage (0-100) used to weight the current sample when " \
1638 "computing exponentially decaying averages for CMS FLS " \
1639 "statistics") \
1640 \
1641 product(uintx, CMS_FLSPadding, 1, \
1642 "The multiple of deviation from mean to use for buffering " \
1643 "against volatility in free list demand") \
1644 \
1645 product(uintx, FLSCoalescePolicy, 2, \
1646 "CMS: aggressiveness level for coalescing, increasing " \
1647 "from 0 to 4") \
1648 \
1649 product(bool, FLSAlwaysCoalesceLarge, false, \
1650 "CMS: larger free blocks are always available for coalescing") \
1651 \
1652 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1653 "CMS: the smaller the percentage the greater the coalescing " \
1654 "force") \
1655 \
1656 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1657 "CMS: the factor by which to inflate estimated demand of small " \
1658 "block sizes to prevent coalescing with an adjoining block") \
1659 \
1660 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1661 "CMS: the factor by which to inflate estimated demand of large " \
1662 "block sizes to prevent coalescing with an adjoining block") \
1663 \
1664 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1665 "CMS: the factor by which to inflate estimated demand of small " \
1666 "block sizes to prevent splitting to supply demand for smaller " \
1667 "blocks") \
1668 \
1669 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1670 "CMS: the factor by which to inflate estimated demand of large " \
1671 "block sizes to prevent splitting to supply demand for smaller " \
1672 "blocks") \
1673 \
1674 product(bool, CMSExtrapolateSweep, false, \
1675 "CMS: cushion for block demand during sweep") \
1676 \
1677 product(uintx, CMS_SweepWeight, 75, \
1678 "Percentage (0-100) used to weight the current sample when " \
1679 "computing exponentially decaying average for inter-sweep " \
1680 "duration") \
1681 \
1682 product(uintx, CMS_SweepPadding, 1, \
1683 "The multiple of deviation from mean to use for buffering " \
1684 "against volatility in inter-sweep duration") \
1685 \
1686 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1687 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1688 "duration exceeds this threshold in milliseconds") \
1689 \
1690 develop(bool, CMSTraceIncrementalMode, false, \
1691 "Trace CMS incremental mode") \
1692 \
1693 develop(bool, CMSTraceIncrementalPacing, false, \
1694 "Trace CMS incremental mode pacing computation") \
1695 \
1696 develop(bool, CMSTraceThreadState, false, \
1697 "Trace the CMS thread state (enable the trace_state() method)") \
1698 \
1699 product(bool, CMSClassUnloadingEnabled, true, \
1700 "Whether class unloading enabled when using CMS GC") \
1701 \
1702 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1703 "When CMS class unloading is enabled, the maximum CMS cycle " \
1704 "count for which classes may not be unloaded") \
1705 \
1706 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1707 "Compact when asked to collect CMS gen with " \
1708 "clear_all_soft_refs()") \
1709 \
1710 product(bool, UseCMSCompactAtFullCollection, true, \
1711 "Use Mark-Sweep-Compact algorithm at full collections") \
1712 \
1713 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1714 "Number of CMS full collection done before compaction if > 0") \
1715 \
1716 develop(intx, CMSDictionaryChoice, 0, \
1717 "Use BinaryTreeDictionary as default in the CMS generation") \
1718 \
1719 product(uintx, CMSIndexedFreeListReplenish, 4, \
1720 "Replenish an indexed free list with this number of chunks") \
1721 \
1722 product(bool, CMSReplenishIntermediate, true, \
1723 "Replenish all intermediate free-list caches") \
1724 \
1725 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1726 "When satisfying batched demand, split blocks from the " \
1727 "IndexedFreeList whose size is a multiple of requested size") \
1728 \
1729 product(bool, CMSLoopWarn, false, \
1730 "Warn in case of excessive CMS looping") \
1731 \
1732 develop(bool, CMSOverflowEarlyRestoration, false, \
1733 "Restore preserved marks early") \
1734 \
1735 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1736 "Size of marking stack") \
1737 \
1738 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1739 "Maximum size of marking stack") \
1740 \
1741 notproduct(bool, CMSMarkStackOverflowALot, false, \
1742 "Simulate frequent marking stack / work queue overflow") \
1743 \
1744 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1745 "An \"interval\" counter that determines how frequently " \
1746 "to simulate overflow; a smaller number increases frequency") \
1747 \
1748 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1749 "Maximum number of abortable preclean iterations, if > 0") \
1750 \
1751 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1752 "Maximum time in abortable preclean (in milliseconds)") \
1753 \
1754 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1755 "Nominal minimum work per abortable preclean iteration") \
1756 \
1757 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1758 "Time that we sleep between iterations when not given " \
1759 "enough work per iteration") \
1760 \
1761 product(uintx, CMSRescanMultiple, 32, \
1762 "Size (in cards) of CMS parallel rescan task") \
1763 \
1764 product(uintx, CMSConcMarkMultiple, 32, \
1765 "Size (in cards) of CMS concurrent MT marking task") \
1766 \
1767 product(bool, CMSAbortSemantics, false, \
1768 "Whether abort-on-overflow semantics is implemented") \
1769 \
1770 product(bool, CMSParallelInitialMarkEnabled, true, \
1771 "Use the parallel initial mark.") \
1772 \
1773 product(bool, CMSParallelRemarkEnabled, true, \
1774 "Whether parallel remark enabled (only if ParNewGC)") \
1775 \
1776 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1777 "Whether parallel remark of survivor space " \
1778 "enabled (effective only if CMSParallelRemarkEnabled)") \
1779 \
1780 product(bool, CMSPLABRecordAlways, true, \
1781 "Always record survivor space PLAB boundaries (effective only " \
1782 "if CMSParallelSurvivorRemarkEnabled)") \
1783 \
1784 product(bool, CMSEdenChunksRecordAlways, true, \
1785 "Always record eden chunks used for the parallel initial mark " \
1786 "or remark of eden") \
1787 \
1788 product(bool, CMSPrintEdenSurvivorChunks, false, \
1789 "Print the eden and the survivor chunks used for the parallel " \
1790 "initial mark or remark of the eden/survivor spaces") \
1791 \
1792 product(bool, CMSConcurrentMTEnabled, true, \
1793 "Whether multi-threaded concurrent work enabled " \
1794 "(effective only if ParNewGC)") \
1795 \
1796 product(bool, CMSPrecleaningEnabled, true, \
1797 "Whether concurrent precleaning enabled") \
1798 \
1799 product(uintx, CMSPrecleanIter, 3, \
1800 "Maximum number of precleaning iteration passes") \
1801 \
1802 product(uintx, CMSPrecleanNumerator, 2, \
1803 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1804 "ratio") \
1805 \
1806 product(uintx, CMSPrecleanDenominator, 3, \
1807 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1808 "ratio") \
1809 \
1810 product(bool, CMSPrecleanRefLists1, true, \
1811 "Preclean ref lists during (initial) preclean phase") \
1812 \
1813 product(bool, CMSPrecleanRefLists2, false, \
1814 "Preclean ref lists during abortable preclean phase") \
1815 \
1816 product(bool, CMSPrecleanSurvivors1, false, \
1817 "Preclean survivors during (initial) preclean phase") \
1818 \
1819 product(bool, CMSPrecleanSurvivors2, true, \
1820 "Preclean survivors during abortable preclean phase") \
1821 \
1822 product(uintx, CMSPrecleanThreshold, 1000, \
1823 "Do not iterate again if number of dirty cards is less than this")\
1824 \
1825 product(bool, CMSCleanOnEnter, true, \
1826 "Clean-on-enter optimization for reducing number of dirty cards") \
1827 \
1828 product(uintx, CMSRemarkVerifyVariant, 1, \
1829 "Choose variant (1,2) of verification following remark") \
1830 \
1831 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1832 "If Eden size is below this, do not try to schedule remark") \
1833 \
1834 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1835 "The Eden occupancy percentage (0-100) at which " \
1836 "to try and schedule remark pause") \
1837 \
1838 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1839 "Start sampling eden top at least before young gen " \
1840 "occupancy reaches 1/<ratio> of the size at which " \
1841 "we plan to schedule remark") \
1842 \
1843 product(uintx, CMSSamplingGrain, 16*K, \
1844 "The minimum distance between eden samples for CMS (see above)") \
1845 \
1846 product(bool, CMSScavengeBeforeRemark, false, \
1847 "Attempt scavenge before the CMS remark step") \
1848 \
1849 develop(bool, CMSTraceSweeper, false, \
1850 "Trace some actions of the CMS sweeper") \
1851 \
1852 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1853 "Don't drain below this size per parallel worker/thief") \
1854 \
1855 manageable(intx, CMSWaitDuration, 2000, \
1856 "Time in milliseconds that CMS thread waits for young GC") \
1857 \
1858 develop(uintx, CMSCheckInterval, 1000, \
1859 "Interval in milliseconds that CMS thread checks if it " \
1860 "should start a collection cycle") \
1861 \
1862 product(bool, CMSYield, true, \
1863 "Yield between steps of CMS") \
1864 \
1865 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1866 "Bitmap operations should process at most this many bits " \
1867 "between yields") \
1868 \
1869 product(bool, CMSDumpAtPromotionFailure, false, \
1870 "Dump useful information about the state of the CMS old " \
1871 "generation upon a promotion failure") \
1872 \
1873 product(bool, CMSPrintChunksInDump, false, \
1874 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1875 "more detailed information about the free chunks") \
1876 \
1877 product(bool, CMSPrintObjectsInDump, false, \
1878 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1879 "more detailed information about the allocated objects") \
1880 \
1881 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1882 "Verify that all references across the FLS boundary " \
1883 "are to valid objects") \
1884 \
1885 diagnostic(bool, FLSVerifyLists, false, \
1886 "Do lots of (expensive) FreeListSpace verification") \
1887 \
1888 diagnostic(bool, FLSVerifyIndexTable, false, \
1889 "Do lots of (expensive) FLS index table verification") \
1890 \
1891 develop(bool, FLSVerifyDictionary, false, \
1892 "Do lots of (expensive) FLS dictionary verification") \
1893 \
1894 develop(bool, VerifyBlockOffsetArray, false, \
1895 "Do (expensive) block offset array verification") \
1896 \
1897 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1898 "Maintain _unallocated_block in BlockOffsetArray " \
1899 "(currently applicable only to CMS collector)") \
1900 \
1901 develop(bool, TraceCMSState, false, \
1902 "Trace the state of the CMS collection") \
1903 \
1904 product(intx, RefDiscoveryPolicy, 0, \
1905 "Select type of reference discovery policy: " \
1906 "reference-based(0) or referent-based(1)") \
1907 \
1908 product(bool, ParallelRefProcEnabled, false, \
1909 "Enable parallel reference processing whenever possible") \
1910 \
1911 product(bool, ParallelRefProcBalancingEnabled, true, \
1912 "Enable balancing of reference processing queues") \
1913 \
1914 product(uintx, CMSTriggerRatio, 80, \
1915 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1916 "allocated before a CMS collection cycle commences") \
1917 \
1918 product(uintx, CMSBootstrapOccupancy, 50, \
1919 "Percentage CMS generation occupancy at which to " \
1920 "initiate CMS collection for bootstrapping collection stats") \
1921 \
1922 product(intx, CMSInitiatingOccupancyFraction, -1, \
1923 "Percentage CMS generation occupancy to start a CMS collection " \
1924 "cycle. A negative value means that CMSTriggerRatio is used") \
1925 \
1926 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1927 "Percentage of the (entire) heap occupancy to start a " \
1928 "concurrent GC cycle. It is used by GCs that trigger a " \
1929 "concurrent GC cycle based on the occupancy of the entire heap, " \
1930 "not just one of the generations (e.g., G1). A value of 0 " \
1931 "denotes 'do constant GC cycles'.") \
1932 \
1933 manageable(intx, CMSTriggerInterval, -1, \
1934 "Commence a CMS collection cycle (at least) every so many " \
1935 "milliseconds (0 permanently, -1 disabled)") \
1936 \
1937 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1938 "Only use occupancy as a criterion for starting a CMS collection")\
1939 \
1940 product(uintx, CMSIsTooFullPercentage, 98, \
1941 "An absolute ceiling above which CMS will always consider the " \
1942 "unloading of classes when class unloading is enabled") \
1943 \
1944 develop(bool, CMSTestInFreeList, false, \
1945 "Check if the coalesced range is already in the " \
1946 "free lists as claimed") \
1947 \
1948 notproduct(bool, CMSVerifyReturnedBytes, false, \
1949 "Check that all the garbage collected was returned to the " \
1950 "free lists") \
1951 \
1952 notproduct(bool, ScavengeALot, false, \
1953 "Force scavenge at every Nth exit from the runtime system " \
1954 "(N=ScavengeALotInterval)") \
1955 \
1956 develop(bool, FullGCALot, false, \
1957 "Force full gc at every Nth exit from the runtime system " \
1958 "(N=FullGCALotInterval)") \
1959 \
1960 notproduct(bool, GCALotAtAllSafepoints, false, \
1961 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1962 \
1963 product(bool, PrintPromotionFailure, false, \
1964 "Print additional diagnostic information following " \
1965 "promotion failure") \
1966 \
1967 notproduct(bool, PromotionFailureALot, false, \
1968 "Use promotion failure handling on every youngest generation " \
1969 "collection") \
1970 \
1971 develop(uintx, PromotionFailureALotCount, 1000, \
1972 "Number of promotion failures occurring at ParGCAllocBuffer " \
1973 "refill attempts (ParNew) or promotion attempts " \
1974 "(other young collectors)") \
1975 \
1976 develop(uintx, PromotionFailureALotInterval, 5, \
1977 "Total collections between promotion failures a lot") \
1978 \
1979 experimental(uintx, WorkStealingSleepMillis, 1, \
1980 "Sleep time when sleep is used for yields") \
1981 \
1982 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1983 "Number of yields before a sleep is done during work stealing") \
1984 \
1985 experimental(uintx, WorkStealingHardSpins, 4096, \
1986 "Number of iterations in a spin loop between checks on " \
1987 "time out of hard spin") \
1988 \
1989 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1990 "Ratio of hard spins to calls to yield") \
1991 \
1992 develop(uintx, ObjArrayMarkingStride, 512, \
1993 "Number of object array elements to push onto the marking stack " \
1994 "before pushing a continuation entry") \
1995 \
1996 develop(bool, MetadataAllocationFailALot, false, \
1997 "Fail metadata allocations at intervals controlled by " \
1998 "MetadataAllocationFailALotInterval") \
1999 \
2000 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2001 "Metadata allocation failure a lot interval") \
2002 \
2003 develop(bool, TraceMetadataChunkAllocation, false, \
2004 "Trace chunk metadata allocations") \
2005 \
2006 product(bool, TraceMetadataHumongousAllocation, false, \
2007 "Trace humongous metadata allocations") \
2008 \
2009 develop(bool, TraceMetavirtualspaceAllocation, false, \
2010 "Trace virtual space metadata allocations") \
2011 \
2012 notproduct(bool, ExecuteInternalVMTests, false, \
2013 "Enable execution of internal VM tests") \
2014 \
2015 notproduct(bool, VerboseInternalVMTests, false, \
2016 "Turn on logging for internal VM tests.") \
2017 \
2018 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2019 \
2020 product_pd(bool, ResizeTLAB, \
2021 "Dynamically resize TLAB size for threads") \
2022 \
2023 product(bool, ZeroTLAB, false, \
2024 "Zero out the newly created TLAB") \
2025 \
2026 product(bool, FastTLABRefill, true, \
2027 "Use fast TLAB refill code") \
2028 \
2029 product(bool, PrintTLAB, false, \
2030 "Print various TLAB related information") \
2031 \
2032 product(bool, TLABStats, true, \
2033 "Provide more detailed and expensive TLAB statistics " \
2034 "(with PrintTLAB)") \
2035 \
2036 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
2037 "Enable LowMemoryProtection")) \
2038 \
2039 product_pd(bool, NeverActAsServerClassMachine, \
2040 "Never act like a server-class machine") \
2041 \
2042 product(bool, AlwaysActAsServerClassMachine, false, \
2043 "Always act like a server-class machine") \
2044 \
2045 product_pd(uint64_t, MaxRAM, \
2046 "Real memory size (in bytes) used to set maximum heap size") \
2047 \
2048 product(uintx, ErgoHeapSizeLimit, 0, \
2049 "Maximum ergonomically set heap size (in bytes); zero means use " \
2050 "MaxRAM / MaxRAMFraction") \
2051 \
2052 product(uintx, MaxRAMFraction, 4, \
2053 "Maximum fraction (1/n) of real memory used for maximum heap " \
2054 "size") \
2055 \
2056 product(uintx, DefaultMaxRAMFraction, 4, \
2057 "Maximum fraction (1/n) of real memory used for maximum heap " \
2058 "size; deprecated: to be renamed to MaxRAMFraction") \
2059 \
2060 product(uintx, MinRAMFraction, 2, \
2061 "Minimum fraction (1/n) of real memory used for maximum heap " \
2062 "size on systems with small physical memory size") \
2063 \
2064 product(uintx, InitialRAMFraction, 64, \
2065 "Fraction (1/n) of real memory used for initial heap size") \
2066 \
2067 develop(uintx, MaxVirtMemFraction, 2, \
2068 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2069 "determining maximum heap size") \
2070 \
2071 product(bool, UseAutoGCSelectPolicy, false, \
2072 "Use automatic collection selection policy") \
2073 \
2074 product(uintx, AutoGCSelectPauseMillis, 5000, \
2075 "Automatic GC selection pause threshold in milliseconds") \
2076 \
2077 product(bool, UseAdaptiveSizePolicy, true, \
2078 "Use adaptive generation sizing policies") \
2079 \
2080 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2081 "Use adaptive survivor sizing policies") \
2082 \
2083 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2084 "Use adaptive young-old sizing policies at minor collections") \
2085 \
2086 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2087 "Use adaptive young-old sizing policies at major collections") \
2088 \
2089 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2090 "Include statistics from System.gc() for adaptive size policy") \
2091 \
2092 product(bool, UseAdaptiveGCBoundary, false, \
2093 "Allow young-old boundary to move") \
2094 \
2095 develop(bool, TraceAdaptiveGCBoundary, false, \
2096 "Trace young-old boundary moves") \
2097 \
2098 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2099 "Resize the virtual spaces of the young or old generations") \
2100 \
2101 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2102 "Policy for changing generation size for throughput goals") \
2103 \
2104 product(uintx, AdaptiveSizePausePolicy, 0, \
2105 "Policy for changing generation size for pause goals") \
2106 \
2107 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2108 "Adjust tenured generation to achieve a minor pause goal") \
2109 \
2110 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2111 "Adjust young generation to achieve a major pause goal") \
2112 \
2113 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2114 "Number of steps where heuristics is used before data is used") \
2115 \
2116 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2117 "Number of collections before the adaptive sizing is started") \
2118 \
2119 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2120 "Collection interval for printing information; zero means never") \
2121 \
2122 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2123 "Use adaptive minimum footprint as a goal") \
2124 \
2125 product(uintx, AdaptiveSizePolicyWeight, 10, \
2126 "Weight given to exponential resizing, between 0 and 100") \
2127 \
2128 product(uintx, AdaptiveTimeWeight, 25, \
2129 "Weight given to time in adaptive policy, between 0 and 100") \
2130 \
2131 product(uintx, PausePadding, 1, \
2132 "How much buffer to keep for pause time") \
2133 \
2134 product(uintx, PromotedPadding, 3, \
2135 "How much buffer to keep for promotion failure") \
2136 \
2137 product(uintx, SurvivorPadding, 3, \
2138 "How much buffer to keep for survivor overflow") \
2139 \
2140 product(uintx, ThresholdTolerance, 10, \
2141 "Allowed collection cost difference between generations") \
2142 \
2143 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2144 "If collection costs are within margin, reduce both by full " \
2145 "delta") \
2146 \
2147 product(uintx, YoungGenerationSizeIncrement, 20, \
2148 "Adaptive size percentage change in young generation") \
2149 \
2150 product(uintx, YoungGenerationSizeSupplement, 80, \
2151 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2152 \
2153 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2154 "Decay factor to YoungedGenerationSizeSupplement") \
2155 \
2156 product(uintx, TenuredGenerationSizeIncrement, 20, \
2157 "Adaptive size percentage change in tenured generation") \
2158 \
2159 product(uintx, TenuredGenerationSizeSupplement, 80, \
2160 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2161 \
2162 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2163 "Decay factor to TenuredGenerationSizeIncrement") \
2164 \
2165 product(uintx, MaxGCPauseMillis, max_uintx, \
2166 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2167 "or (G1 Only) the maximum GC time per MMU time slice") \
2168 \
2169 product(uintx, GCPauseIntervalMillis, 0, \
2170 "Time slice for MMU specification") \
2171 \
2172 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2173 "Adaptive size policy maximum GC minor pause time goal " \
2174 "in millisecond") \
2175 \
2176 product(uintx, GCTimeRatio, 99, \
2177 "Adaptive size policy application time to GC time ratio") \
2178 \
2179 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2180 "Adaptive size scale down factor for shrinking") \
2181 \
2182 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2183 "Adaptive size decays the major cost for long major intervals") \
2184 \
2185 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2186 "Time scale over which major costs decay") \
2187 \
2188 product(uintx, MinSurvivorRatio, 3, \
2189 "Minimum ratio of young generation/survivor space size") \
2190 \
2191 product(uintx, InitialSurvivorRatio, 8, \
2192 "Initial ratio of young generation/survivor space size") \
2193 \
2194 product(uintx, BaseFootPrintEstimate, 256*M, \
2195 "Estimate of footprint other than Java Heap") \
2196 \
2197 product(bool, UseGCOverheadLimit, true, \
2198 "Use policy to limit of proportion of time spent in GC " \
2199 "before an OutOfMemory error is thrown") \
2200 \
2201 product(uintx, GCTimeLimit, 98, \
2202 "Limit of the proportion of time spent in GC before " \
2203 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2204 \
2205 product(uintx, GCHeapFreeLimit, 2, \
2206 "Minimum percentage of free space after a full GC before an " \
2207 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2208 \
2209 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2210 "Number of consecutive collections before gc time limit fires") \
2211 \
2212 product(bool, PrintAdaptiveSizePolicy, false, \
2213 "Print information about AdaptiveSizePolicy") \
2214 \
2215 product(intx, PrefetchCopyIntervalInBytes, -1, \
2216 "How far ahead to prefetch destination area (<= 0 means off)") \
2217 \
2218 product(intx, PrefetchScanIntervalInBytes, -1, \
2219 "How far ahead to prefetch scan area (<= 0 means off)") \
2220 \
2221 product(intx, PrefetchFieldsAhead, -1, \
2222 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2223 \
2224 diagnostic(bool, VerifySilently, false, \
2225 "Do not print the verification progress") \
2226 \
2227 diagnostic(bool, VerifyDuringStartup, false, \
2228 "Verify memory system before executing any Java code " \
2229 "during VM initialization") \
2230 \
2231 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2232 "Verify system before exiting") \
2233 \
2234 diagnostic(bool, VerifyBeforeGC, false, \
2235 "Verify memory system before GC") \
2236 \
2237 diagnostic(bool, VerifyAfterGC, false, \
2238 "Verify memory system after GC") \
2239 \
2240 diagnostic(bool, VerifyDuringGC, false, \
2241 "Verify memory system during GC (between phases)") \
2242 \
2243 diagnostic(bool, GCParallelVerificationEnabled, true, \
2244 "Enable parallel memory system verification") \
2245 \
2246 diagnostic(bool, DeferInitialCardMark, false, \
2247 "When +ReduceInitialCardMarks, explicitly defer any that " \
2248 "may arise from new_pre_store_barrier") \
2249 \
2250 diagnostic(bool, VerifyRememberedSets, false, \
2251 "Verify GC remembered sets") \
2252 \
2253 diagnostic(bool, VerifyObjectStartArray, true, \
2254 "Verify GC object start array if verify before/after") \
2255 \
2256 product(bool, DisableExplicitGC, false, \
2257 "Ignore calls to System.gc()") \
2258 \
2259 notproduct(bool, CheckMemoryInitialization, false, \
2260 "Check memory initialization") \
2261 \
2262 product(bool, CollectGen0First, false, \
2263 "Collect youngest generation before each full GC") \
2264 \
2265 diagnostic(bool, BindCMSThreadToCPU, false, \
2266 "Bind CMS Thread to CPU if possible") \
2267 \
2268 diagnostic(uintx, CPUForCMSThread, 0, \
2269 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2270 \
2271 product(bool, BindGCTaskThreadsToCPUs, false, \
2272 "Bind GCTaskThreads to CPUs if possible") \
2273 \
2274 product(bool, UseGCTaskAffinity, false, \
2275 "Use worker affinity when asking for GCTasks") \
2276 \
2277 product(uintx, ProcessDistributionStride, 4, \
2278 "Stride through processors when distributing processes") \
2279 \
2280 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2281 "Number of times the coordinator GC thread will sleep while " \
2282 "yielding before giving up and resuming GC") \
2283 \
2284 product(uintx, CMSYieldSleepCount, 0, \
2285 "Number of times a GC thread (minus the coordinator) " \
2286 "will sleep while yielding before giving up and resuming GC") \
2287 \
2288 /* gc tracing */ \
2289 manageable(bool, PrintGC, false, \
2290 "Print message at garbage collection") \
2291 \
2292 manageable(bool, PrintGCDetails, false, \
2293 "Print more details at garbage collection") \
2294 \
2295 manageable(bool, PrintGCDateStamps, false, \
2296 "Print date stamps at garbage collection") \
2297 \
2298 manageable(bool, PrintGCTimeStamps, false, \
2299 "Print timestamps at garbage collection") \
2300 \
2301 product(bool, PrintGCTaskTimeStamps, false, \
2302 "Print timestamps for individual gc worker thread tasks") \
2303 \
2304 develop(intx, ConcGCYieldTimeout, 0, \
2305 "If non-zero, assert that GC threads yield within this " \
2306 "number of milliseconds") \
2307 \
2308 notproduct(bool, TraceMarkSweep, false, \
2309 "Trace mark sweep") \
2310 \
2311 product(bool, PrintReferenceGC, false, \
2312 "Print times spent handling reference objects during GC " \
2313 "(enabled only when PrintGCDetails)") \
2314 \
2315 develop(bool, TraceReferenceGC, false, \
2316 "Trace handling of soft/weak/final/phantom references") \
2317 \
2318 develop(bool, TraceFinalizerRegistration, false, \
2319 "Trace registration of final references") \
2320 \
2321 notproduct(bool, TraceScavenge, false, \
2322 "Trace scavenge") \
2323 \
2324 product_rw(bool, TraceClassLoading, false, \
2325 "Trace all classes loaded") \
2326 \
2327 product(bool, TraceClassLoadingPreorder, false, \
2328 "Trace all classes loaded in order referenced (not loaded)") \
2329 \
2330 product_rw(bool, TraceClassUnloading, false, \
2331 "Trace unloading of classes") \
2332 \
2333 product_rw(bool, TraceLoaderConstraints, false, \
2334 "Trace loader constraints") \
2335 \
2336 develop(bool, TraceClassLoaderData, false, \
2337 "Trace class loader loader_data lifetime") \
2338 \
2339 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2340 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2341 "Initial size of the boot class loader data metaspace") \
2342 \
2343 product(bool, TraceGen0Time, false, \
2344 "Trace accumulated time for Gen 0 collection") \
2345 \
2346 product(bool, TraceGen1Time, false, \
2347 "Trace accumulated time for Gen 1 collection") \
2348 \
2349 product(bool, PrintTenuringDistribution, false, \
2350 "Print tenuring age information") \
2351 \
2352 product_rw(bool, PrintHeapAtGC, false, \
2353 "Print heap layout before and after each GC") \
2354 \
2355 product_rw(bool, PrintHeapAtGCExtended, false, \
2356 "Print extended information about the layout of the heap " \
2357 "when -XX:+PrintHeapAtGC is set") \
2358 \
2359 product(bool, PrintHeapAtSIGBREAK, true, \
2360 "Print heap layout in response to SIGBREAK") \
2361 \
2362 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2363 "Print a class histogram before any major stop-world GC") \
2364 \
2365 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2366 "Print a class histogram after any major stop-world GC") \
2367 \
2368 manageable(bool, PrintClassHistogram, false, \
2369 "Print a histogram of class instances") \
2370 \
2371 develop(bool, TraceWorkGang, false, \
2372 "Trace activities of work gangs") \
2373 \
2374 product(bool, TraceParallelOldGCTasks, false, \
2375 "Trace multithreaded GC activity") \
2376 \
2377 develop(bool, TraceBlockOffsetTable, false, \
2378 "Print BlockOffsetTable maps") \
2379 \
2380 develop(bool, TraceCardTableModRefBS, false, \
2381 "Print CardTableModRefBS maps") \
2382 \
2383 develop(bool, TraceGCTaskManager, false, \
2384 "Trace actions of the GC task manager") \
2385 \
2386 develop(bool, TraceGCTaskQueue, false, \
2387 "Trace actions of the GC task queues") \
2388 \
2389 diagnostic(bool, TraceGCTaskThread, false, \
2390 "Trace actions of the GC task threads") \
2391 \
2392 product(bool, PrintParallelOldGCPhaseTimes, false, \
2393 "Print the time taken by each phase in ParallelOldGC " \
2394 "(PrintGCDetails must also be enabled)") \
2395 \
2396 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2397 "Trace marking phase in ParallelOldGC") \
2398 \
2399 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2400 "Trace summary phase in ParallelOldGC") \
2401 \
2402 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2403 "Trace compaction phase in ParallelOldGC") \
2404 \
2405 develop(bool, TraceParallelOldGCDensePrefix, false, \
2406 "Trace dense prefix computation for ParallelOldGC") \
2407 \
2408 develop(bool, IgnoreLibthreadGPFault, false, \
2409 "Suppress workaround for libthread GP fault") \
2410 \
2411 product(bool, PrintJNIGCStalls, false, \
2412 "Print diagnostic message when GC is stalled " \
2413 "by JNI critical section") \
2414 \
2415 experimental(double, ObjectCountCutOffPercent, 0.5, \
2416 "The percentage of the used heap that the instances of a class " \
2417 "must occupy for the class to generate a trace event") \
2418 \
2419 /* GC log rotation setting */ \
2420 \
2421 product(bool, UseGCLogFileRotation, false, \
2422 "Rotate gclog files (for long running applications). It requires "\
2423 "-Xloggc:<filename>") \
2424 \
2425 product(uintx, NumberOfGCLogFiles, 0, \
2426 "Number of gclog files in rotation " \
2427 "(default: 0, no rotation)") \
2428 \
2429 product(uintx, GCLogFileSize, 8*K, \
2430 "GC log file size, requires UseGCLogFileRotation. " \
2431 "Set to 0 to only trigger rotation via jcmd") \
2432 \
2433 /* JVMTI heap profiling */ \
2434 \
2435 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2436 "Trace JVMTI object tagging calls") \
2437 \
2438 diagnostic(bool, VerifyBeforeIteration, false, \
2439 "Verify memory system before JVMTI iteration") \
2440 \
2441 /* compiler interface */ \
2442 \
2443 develop(bool, CIPrintCompilerName, false, \
2444 "when CIPrint is active, print the name of the active compiler") \
2445 \
2446 develop(bool, CIPrintCompileQueue, false, \
2447 "display the contents of the compile queue whenever a " \
2448 "compilation is enqueued") \
2449 \
2450 develop(bool, CIPrintRequests, false, \
2451 "display every request for compilation") \
2452 \
2453 product(bool, CITime, false, \
2454 "collect timing information for compilation") \
2455 \
2456 develop(bool, CITimeEach, false, \
2457 "display timing information after each successful compilation") \
2458 \
2459 develop(bool, CICountOSR, false, \
2460 "use a separate counter when assigning ids to osr compilations") \
2461 \
2462 develop(bool, CICompileNatives, true, \
2463 "compile native methods if supported by the compiler") \
2464 \
2465 develop_pd(bool, CICompileOSR, \
2466 "compile on stack replacement methods if supported by the " \
2467 "compiler") \
2468 \
2469 develop(bool, CIPrintMethodCodes, false, \
2470 "print method bytecodes of the compiled code") \
2471 \
2472 develop(bool, CIPrintTypeFlow, false, \
2473 "print the results of ciTypeFlow analysis") \
2474 \
2475 develop(bool, CITraceTypeFlow, false, \
2476 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2477 \
2478 develop(intx, OSROnlyBCI, -1, \
2479 "OSR only at this bci. Negative values mean exclude that bci") \
2480 \
2481 /* compiler */ \
2482 \
2483 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2484 "Number of compiler threads to run") \
2485 \
2486 product(intx, CompilationPolicyChoice, 0, \
2487 "which compilation policy (0/1)") \
2488 \
2489 develop(bool, UseStackBanging, true, \
2490 "use stack banging for stack overflow checks (required for " \
2491 "proper StackOverflow handling; disable only to measure cost " \
2492 "of stackbanging)") \
2493 \
2494 develop(bool, UseStrictFP, true, \
2495 "use strict fp if modifier strictfp is set") \
2496 \
2497 develop(bool, GenerateSynchronizationCode, true, \
2498 "generate locking/unlocking code for synchronized methods and " \
2499 "monitors") \
2500 \
2501 develop(bool, GenerateCompilerNullChecks, true, \
2502 "Generate explicit null checks for loads/stores/calls") \
2503 \
2504 develop(bool, GenerateRangeChecks, true, \
2505 "Generate range checks for array accesses") \
2506 \
2507 develop_pd(bool, ImplicitNullChecks, \
2508 "Generate code for implicit null checks") \
2509 \
2510 product_pd(bool, TrapBasedNullChecks, \
2511 "Generate code for null checks that uses a cmp and trap " \
2512 "instruction raising SIGTRAP. This is only used if an access to" \
2513 "null (+offset) will not raise a SIGSEGV, i.e.," \
2514 "ImplicitNullChecks don't work (PPC64).") \
2515 \
2516 product(bool, PrintSafepointStatistics, false, \
2517 "Print statistics about safepoint synchronization") \
2518 \
2519 product(intx, PrintSafepointStatisticsCount, 300, \
2520 "Total number of safepoint statistics collected " \
2521 "before printing them out") \
2522 \
2523 product(intx, PrintSafepointStatisticsTimeout, -1, \
2524 "Print safepoint statistics only when safepoint takes " \
2525 "more than PrintSafepointSatisticsTimeout in millis") \
2526 \
2527 product(bool, TraceSafepointCleanupTime, false, \
2528 "Print the break down of clean up tasks performed during " \
2529 "safepoint") \
2530 \
2531 product(bool, Inline, true, \
2532 "Enable inlining") \
2533 \
2534 product(bool, ClipInlining, true, \
2535 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2536 \
2537 develop(bool, UseCHA, true, \
2538 "Enable CHA") \
2539 \
2540 product(bool, UseTypeProfile, true, \
2541 "Check interpreter profile for historically monomorphic calls") \
2542 \
2543 notproduct(bool, TimeCompiler, false, \
2544 "Time the compiler") \
2545 \
2546 diagnostic(bool, PrintInlining, false, \
2547 "Print inlining optimizations") \
2548 \
2549 product(bool, UsePopCountInstruction, false, \
2550 "Use population count instruction") \
2551 \
2552 develop(bool, EagerInitialization, false, \
2553 "Eagerly initialize classes if possible") \
2554 \
2555 develop(bool, TraceMethodReplacement, false, \
2556 "Print when methods are replaced do to recompilation") \
2557 \
2558 develop(bool, PrintMethodFlushing, false, \
2559 "Print the nmethods being flushed") \
2560 \
2561 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2562 "print statistics about method flushing") \
2563 \
2564 develop(bool, UseRelocIndex, false, \
2565 "Use an index to speed random access to relocations") \
2566 \
2567 develop(bool, StressCodeBuffers, false, \
2568 "Exercise code buffer expansion and other rare state changes") \
2569 \
2570 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2571 "Generate extra debugging information for non-safepoints in " \
2572 "nmethods") \
2573 \
2574 product(bool, PrintVMOptions, false, \
2575 "Print flags that appeared on the command line") \
2576 \
2577 product(bool, IgnoreUnrecognizedVMOptions, false, \
2578 "Ignore unrecognized VM options") \
2579 \
2580 product(bool, PrintCommandLineFlags, false, \
2581 "Print flags specified on command line or set by ergonomics") \
2582 \
2583 product(bool, PrintFlagsInitial, false, \
2584 "Print all VM flags before argument processing and exit VM") \
2585 \
2586 product(bool, PrintFlagsFinal, false, \
2587 "Print all VM flags after argument and ergonomic processing") \
2588 \
2589 notproduct(bool, PrintFlagsWithComments, false, \
2590 "Print all VM flags with default values and descriptions and " \
2591 "exit") \
2592 \
2593 diagnostic(bool, SerializeVMOutput, true, \
2594 "Use a mutex to serialize output to tty and LogFile") \
2595 \
2596 diagnostic(bool, DisplayVMOutput, true, \
2597 "Display all VM output on the tty, independently of LogVMOutput") \
2598 \
2599 diagnostic(bool, LogVMOutput, false, \
2600 "Save VM output to LogFile") \
2601 \
2602 diagnostic(ccstr, LogFile, NULL, \
2603 "If LogVMOutput or LogCompilation is on, save VM output to " \
2604 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2605 \
2606 product(ccstr, ErrorFile, NULL, \
2607 "If an error occurs, save the error data to this file " \
2608 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2609 \
2610 product(bool, DisplayVMOutputToStderr, false, \
2611 "If DisplayVMOutput is true, display all VM output to stderr") \
2612 \
2613 product(bool, DisplayVMOutputToStdout, false, \
2614 "If DisplayVMOutput is true, display all VM output to stdout") \
2615 \
2616 product(bool, UseHeavyMonitors, false, \
2617 "use heavyweight instead of lightweight Java monitors") \
2618 \
2619 product(bool, PrintStringTableStatistics, false, \
2620 "print statistics about the StringTable and SymbolTable") \
2621 \
2622 diagnostic(bool, VerifyStringTableAtExit, false, \
2623 "verify StringTable contents at exit") \
2624 \
2625 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2626 "print histogram of the symbol table") \
2627 \
2628 notproduct(bool, ExitVMOnVerifyError, false, \
2629 "standard exit from VM if bytecode verify error " \
2630 "(only in debug mode)") \
2631 \
2632 notproduct(ccstr, AbortVMOnException, NULL, \
2633 "Call fatal if this exception is thrown. Example: " \
2634 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2635 \
2636 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2637 "Call fatal if the exception pointed by AbortVMOnException " \
2638 "has this message") \
2639 \
2640 develop(bool, DebugVtables, false, \
2641 "add debugging code to vtable dispatch") \
2642 \
2643 develop(bool, PrintVtables, false, \
2644 "print vtables when printing klass") \
2645 \
2646 notproduct(bool, PrintVtableStats, false, \
2647 "print vtables stats at end of run") \
2648 \
2649 develop(bool, TraceCreateZombies, false, \
2650 "trace creation of zombie nmethods") \
2651 \
2652 notproduct(bool, IgnoreLockingAssertions, false, \
2653 "disable locking assertions (for speed)") \
2654 \
2655 product(bool, RangeCheckElimination, true, \
2656 "Eliminate range checks") \
2657 \
2658 develop_pd(bool, UncommonNullCast, \
2659 "track occurrences of null in casts; adjust compiler tactics") \
2660 \
2661 develop(bool, TypeProfileCasts, true, \
2662 "treat casts like calls for purposes of type profiling") \
2663 \
2664 develop(bool, DelayCompilationDuringStartup, true, \
2665 "Delay invoking the compiler until main application class is " \
2666 "loaded") \
2667 \
2668 develop(bool, CompileTheWorld, false, \
2669 "Compile all methods in all classes in bootstrap class path " \
2670 "(stress test)") \
2671 \
2672 develop(bool, CompileTheWorldPreloadClasses, true, \
2673 "Preload all classes used by a class before start loading") \
2674 \
2675 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2676 "Force a safepoint every n compiles so sweeper can keep up") \
2677 \
2678 develop(bool, FillDelaySlots, true, \
2679 "Fill delay slots (on SPARC only)") \
2680 \
2681 develop(bool, TimeLivenessAnalysis, false, \
2682 "Time computation of bytecode liveness analysis") \
2683 \
2684 develop(bool, TraceLivenessGen, false, \
2685 "Trace the generation of liveness analysis information") \
2686 \
2687 notproduct(bool, TraceLivenessQuery, false, \
2688 "Trace queries of liveness analysis information") \
2689 \
2690 notproduct(bool, CollectIndexSetStatistics, false, \
2691 "Collect information about IndexSets") \
2692 \
2693 develop(bool, UseLoopSafepoints, true, \
2694 "Generate Safepoint nodes in every loop") \
2695 \
2696 develop(intx, FastAllocateSizeLimit, 128*K, \
2697 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2698 "Inline allocations larger than this in doublewords must go slow")\
2699 \
2700 product(bool, AggressiveOpts, false, \
2701 "Enable aggressive optimizations - see arguments.cpp") \
2702 \
2703 product_pd(uintx, TypeProfileLevel, \
2704 "=XYZ, with Z: Type profiling of arguments at call; " \
2705 "Y: Type profiling of return value at call; " \
2706 "X: Type profiling of parameters to methods; " \
2707 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2708 \
2709 product(intx, TypeProfileArgsLimit, 2, \
2710 "max number of call arguments to consider for type profiling") \
2711 \
2712 product(intx, TypeProfileParmsLimit, 2, \
2713 "max number of incoming parameters to consider for type profiling"\
2714 ", -1 for all") \
2715 \
2716 /* statistics */ \
2717 develop(bool, CountCompiledCalls, false, \
2718 "Count method invocations") \
2719 \
2720 notproduct(bool, CountRuntimeCalls, false, \
2721 "Count VM runtime calls") \
2722 \
2723 develop(bool, CountJNICalls, false, \
2724 "Count jni method invocations") \
2725 \
2726 notproduct(bool, CountJVMCalls, false, \
2727 "Count jvm method invocations") \
2728 \
2729 notproduct(bool, CountRemovableExceptions, false, \
2730 "Count exceptions that could be replaced by branches due to " \
2731 "inlining") \
2732 \
2733 notproduct(bool, ICMissHistogram, false, \
2734 "Produce histogram of IC misses") \
2735 \
2736 notproduct(bool, PrintClassStatistics, false, \
2737 "Print class statistics at end of run") \
2738 \
2739 notproduct(bool, PrintMethodStatistics, false, \
2740 "Print method statistics at end of run") \
2741 \
2742 /* interpreter */ \
2743 develop(bool, ClearInterpreterLocals, false, \
2744 "Always clear local variables of interpreter activations upon " \
2745 "entry") \
2746 \
2747 product_pd(bool, RewriteBytecodes, \
2748 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2749 \
2750 product_pd(bool, RewriteFrequentPairs, \
2751 "Rewrite frequently used bytecode pairs into a single bytecode") \
2752 \
2753 diagnostic(bool, PrintInterpreter, false, \
2754 "Print the generated interpreter code") \
2755 \
2756 product(bool, UseInterpreter, true, \
2757 "Use interpreter for non-compiled methods") \
2758 \
2759 develop(bool, UseFastSignatureHandlers, true, \
2760 "Use fast signature handlers for native calls") \
2761 \
2762 product(bool, UseLoopCounter, true, \
2763 "Increment invocation counter on backward branch") \
2764 \
2765 product(bool, UseFastEmptyMethods, true, \
2766 "Use fast method entry code for empty methods") \
2767 \
2768 product(bool, UseFastAccessorMethods, true, \
2769 "Use fast method entry code for accessor methods") \
2770 \
2771 product_pd(bool, UseOnStackReplacement, \
2772 "Use on stack replacement, calls runtime if invoc. counter " \
2773 "overflows in loop") \
2774 \
2775 notproduct(bool, TraceOnStackReplacement, false, \
2776 "Trace on stack replacement") \
2777 \
2778 product_pd(bool, PreferInterpreterNativeStubs, \
2779 "Use always interpreter stubs for native methods invoked via " \
2780 "interpreter") \
2781 \
2782 develop(bool, CountBytecodes, false, \
2783 "Count number of bytecodes executed") \
2784 \
2785 develop(bool, PrintBytecodeHistogram, false, \
2786 "Print histogram of the executed bytecodes") \
2787 \
2788 develop(bool, PrintBytecodePairHistogram, false, \
2789 "Print histogram of the executed bytecode pairs") \
2790 \
2791 diagnostic(bool, PrintSignatureHandlers, false, \
2792 "Print code generated for native method signature handlers") \
2793 \
2794 develop(bool, VerifyOops, false, \
2795 "Do plausibility checks for oops") \
2796 \
2797 develop(bool, CheckUnhandledOops, false, \
2798 "Check for unhandled oops in VM code") \
2799 \
2800 develop(bool, VerifyJNIFields, trueInDebug, \
2801 "Verify jfieldIDs for instance fields") \
2802 \
2803 notproduct(bool, VerifyJNIEnvThread, false, \
2804 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2805 "from JNI") \
2806 \
2807 develop(bool, VerifyFPU, false, \
2808 "Verify FPU state (check for NaN's, etc.)") \
2809 \
2810 develop(bool, VerifyThread, false, \
2811 "Watch the thread register for corruption (SPARC only)") \
2812 \
2813 develop(bool, VerifyActivationFrameSize, false, \
2814 "Verify that activation frame didn't become smaller than its " \
2815 "minimal size") \
2816 \
2817 develop(bool, TraceFrequencyInlining, false, \
2818 "Trace frequency based inlining") \
2819 \
2820 develop_pd(bool, InlineIntrinsics, \
2821 "Inline intrinsics that can be statically resolved") \
2822 \
2823 product_pd(bool, ProfileInterpreter, \
2824 "Profile at the bytecode level during interpretation") \
2825 \
2826 develop(bool, TraceProfileInterpreter, false, \
2827 "Trace profiling at the bytecode level during interpretation. " \
2828 "This outputs the profiling information collected to improve " \
2829 "jit compilation.") \
2830 \
2831 develop_pd(bool, ProfileTraps, \
2832 "Profile deoptimization traps at the bytecode level") \
2833 \
2834 product(intx, ProfileMaturityPercentage, 20, \
2835 "number of method invocations/branches (expressed as % of " \
2836 "CompileThreshold) before using the method's profile") \
2837 \
2838 diagnostic(bool, PrintMethodData, false, \
2839 "Print the results of +ProfileInterpreter at end of run") \
2840 \
2841 develop(bool, VerifyDataPointer, trueInDebug, \
2842 "Verify the method data pointer during interpreter profiling") \
2843 \
2844 develop(bool, VerifyCompiledCode, false, \
2845 "Include miscellaneous runtime verifications in nmethod code; " \
2846 "default off because it disturbs nmethod size heuristics") \
2847 \
2848 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2849 "Manually make GC thread crash then dump java stack trace; " \
2850 "Test only") \
2851 \
2852 /* compilation */ \
2853 product(bool, UseCompiler, true, \
2854 "Use Just-In-Time compilation") \
2855 \
2856 develop(bool, TraceCompilationPolicy, false, \
2857 "Trace compilation policy") \
2858 \
2859 develop(bool, TimeCompilationPolicy, false, \
2860 "Time the compilation policy") \
2861 \
2862 product(bool, UseCounterDecay, true, \
2863 "Adjust recompilation counters") \
2864 \
2865 develop(intx, CounterHalfLifeTime, 30, \
2866 "Half-life time of invocation counters (in seconds)") \
2867 \
2868 develop(intx, CounterDecayMinIntervalLength, 500, \
2869 "The minimum interval (in milliseconds) between invocation of " \
2870 "CounterDecay") \
2871 \
2872 product(bool, AlwaysCompileLoopMethods, false, \
2873 "When using recompilation, never interpret methods " \
2874 "containing loops") \
2875 \
2876 product(bool, DontCompileHugeMethods, true, \
2877 "Do not compile methods > HugeMethodLimit") \
2878 \
2879 /* Bytecode escape analysis estimation. */ \
2880 product(bool, EstimateArgEscape, true, \
2881 "Analyze bytecodes to estimate escape state of arguments") \
2882 \
2883 product(intx, BCEATraceLevel, 0, \
2884 "How much tracing to do of bytecode escape analysis estimates") \
2885 \
2886 product(intx, MaxBCEAEstimateLevel, 5, \
2887 "Maximum number of nested calls that are analyzed by BC EA") \
2888 \
2889 product(intx, MaxBCEAEstimateSize, 150, \
2890 "Maximum bytecode size of a method to be analyzed by BC EA") \
2891 \
2892 product(intx, AllocatePrefetchStyle, 1, \
2893 "0 = no prefetch, " \
2894 "1 = prefetch instructions for each allocation, " \
2895 "2 = use TLAB watermark to gate allocation prefetch, " \
2896 "3 = use BIS instruction on Sparc for allocation prefetch") \
2897 \
2898 product(intx, AllocatePrefetchDistance, -1, \
2899 "Distance to prefetch ahead of allocation pointer") \
2900 \
2901 product(intx, AllocatePrefetchLines, 3, \
2902 "Number of lines to prefetch ahead of array allocation pointer") \
2903 \
2904 product(intx, AllocateInstancePrefetchLines, 1, \
2905 "Number of lines to prefetch ahead of instance allocation " \
2906 "pointer") \
2907 \
2908 product(intx, AllocatePrefetchStepSize, 16, \
2909 "Step size in bytes of sequential prefetch instructions") \
2910 \
2911 product(intx, AllocatePrefetchInstr, 0, \
2912 "Prefetch instruction to prefetch ahead of allocation pointer") \
2913 \
2914 /* deoptimization */ \
2915 develop(bool, TraceDeoptimization, false, \
2916 "Trace deoptimization") \
2917 \
2918 develop(bool, DebugDeoptimization, false, \
2919 "Tracing various information while debugging deoptimization") \
2920 \
2921 product(intx, SelfDestructTimer, 0, \
2922 "Will cause VM to terminate after a given time (in minutes) " \
2923 "(0 means off)") \
2924 \
2925 product(intx, MaxJavaStackTraceDepth, 1024, \
2926 "The maximum number of lines in the stack trace for Java " \
2927 "exceptions (0 means all)") \
2928 \
2929 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2930 "Guarantee a safepoint (at least) every so many milliseconds " \
2931 "(0 means none)")) \
2932 \
2933 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2934 "Guarantee a safepoint (at least) every so many milliseconds " \
2935 "(0 means none)")) \
2936 \
2937 product(intx, SafepointTimeoutDelay, 10000, \
2938 "Delay in milliseconds for option SafepointTimeout") \
2939 \
2940 product(intx, NmethodSweepFraction, 16, \
2941 "Number of invocations of sweeper to cover all nmethods") \
2942 \
2943 product(intx, NmethodSweepCheckInterval, 5, \
2944 "Compilers wake up every n seconds to possibly sweep nmethods") \
2945 \
2946 product(intx, NmethodSweepActivity, 10, \
2947 "Removes cold nmethods from code cache if > 0. Higher values " \
2948 "result in more aggressive sweeping") \
2949 \
2950 notproduct(bool, LogSweeper, false, \
2951 "Keep a ring buffer of sweeper activity") \
2952 \
2953 notproduct(intx, SweeperLogEntries, 1024, \
2954 "Number of records in the ring buffer of sweeper activity") \
2955 \
2956 notproduct(intx, MemProfilingInterval, 500, \
2957 "Time between each invocation of the MemProfiler") \
2958 \
2959 develop(intx, MallocCatchPtr, -1, \
2960 "Hit breakpoint when mallocing/freeing this pointer") \
2961 \
2962 notproduct(intx, AssertRepeat, 1, \
2963 "number of times to evaluate expression in assert " \
2964 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2965 \
2966 notproduct(ccstrlist, SuppressErrorAt, "", \
2967 "List of assertions (file:line) to muzzle") \
2968 \
2969 notproduct(uintx, HandleAllocationLimit, 1024, \
2970 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2971 "is used") \
2972 \
2973 develop(uintx, TotalHandleAllocationLimit, 1024, \
2974 "Threshold for total handle allocation when " \
2975 "+TraceHandleAllocation is used") \
2976 \
2977 develop(intx, StackPrintLimit, 100, \
2978 "number of stack frames to print in VM-level stack dump") \
2979 \
2980 notproduct(intx, MaxElementPrintSize, 256, \
2981 "maximum number of elements to print") \
2982 \
2983 notproduct(intx, MaxSubklassPrintSize, 4, \
2984 "maximum number of subklasses to print when printing klass") \
2985 \
2986 product(intx, MaxInlineLevel, 9, \
2987 "maximum number of nested calls that are inlined") \
2988 \
2989 product(intx, MaxRecursiveInlineLevel, 1, \
2990 "maximum number of nested recursive calls that are inlined") \
2991 \
2992 develop(intx, MaxForceInlineLevel, 100, \
2993 "maximum number of nested calls that are forced for inlining " \
2994 "(using CompilerOracle or marked w/ @ForceInline)") \
2995 \
2996 product_pd(intx, InlineSmallCode, \
2997 "Only inline already compiled methods if their code size is " \
2998 "less than this") \
2999 \
3000 product(intx, MaxInlineSize, 35, \
3001 "The maximum bytecode size of a method to be inlined") \
3002 \
3003 product_pd(intx, FreqInlineSize, \
3004 "The maximum bytecode size of a frequent method to be inlined") \
3005 \
3006 product(intx, MaxTrivialSize, 6, \
3007 "The maximum bytecode size of a trivial method to be inlined") \
3008 \
3009 product(intx, MinInliningThreshold, 250, \
3010 "The minimum invocation count a method needs to have to be " \
3011 "inlined") \
3012 \
3013 develop(intx, MethodHistogramCutoff, 100, \
3014 "The cutoff value for method invocation histogram (+CountCalls)") \
3015 \
3016 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3017 "Number of interpreted methods to show in profile") \
3018 \
3019 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3020 "Number of compiled methods to show in profile") \
3021 \
3022 develop(intx, ProfilerNumberOfStubMethods, 25, \
3023 "Number of stub methods to show in profile") \
3024 \
3025 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3026 "Number of runtime stub nodes to show in profile") \
3027 \
3028 product(intx, ProfileIntervalsTicks, 100, \
3029 "Number of ticks between printing of interval profile " \
3030 "(+ProfileIntervals)") \
3031 \
3032 notproduct(intx, ScavengeALotInterval, 1, \
3033 "Interval between which scavenge will occur with +ScavengeALot") \
3034 \
3035 notproduct(intx, FullGCALotInterval, 1, \
3036 "Interval between which full gc will occur with +FullGCALot") \
3037 \
3038 notproduct(intx, FullGCALotStart, 0, \
3039 "For which invocation to start FullGCAlot") \
3040 \
3041 notproduct(intx, FullGCALotDummies, 32*K, \
3042 "Dummy object allocated with +FullGCALot, forcing all objects " \
3043 "to move") \
3044 \
3045 develop(intx, DontYieldALotInterval, 10, \
3046 "Interval between which yields will be dropped (milliseconds)") \
3047 \
3048 develop(intx, MinSleepInterval, 1, \
3049 "Minimum sleep() interval (milliseconds) when " \
3050 "ConvertSleepToYield is off (used for Solaris)") \
3051 \
3052 develop(intx, ProfilerPCTickThreshold, 15, \
3053 "Number of ticks in a PC buckets to be a hotspot") \
3054 \
3055 notproduct(intx, DeoptimizeALotInterval, 5, \
3056 "Number of exits until DeoptimizeALot kicks in") \
3057 \
3058 notproduct(intx, ZombieALotInterval, 5, \
3059 "Number of exits until ZombieALot kicks in") \
3060 \
3061 diagnostic(intx, MallocVerifyInterval, 0, \
3062 "If non-zero, verify C heap after every N calls to " \
3063 "malloc/realloc/free") \
3064 \
3065 diagnostic(intx, MallocVerifyStart, 0, \
3066 "If non-zero, start verifying C heap after Nth call to " \
3067 "malloc/realloc/free") \
3068 \
3069 diagnostic(uintx, MallocMaxTestWords, 0, \
3070 "If non-zero, maximum number of words that malloc/realloc can " \
3071 "allocate (for testing only)") \
3072 \
3073 product(intx, TypeProfileWidth, 2, \
3074 "Number of receiver types to record in call/cast profile") \
3075 \
3076 develop(intx, BciProfileWidth, 2, \
3077 "Number of return bci's to record in ret profile") \
3078 \
3079 product(intx, PerMethodRecompilationCutoff, 400, \
3080 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3081 \
3082 product(intx, PerBytecodeRecompilationCutoff, 200, \
3083 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3084 \
3085 product(intx, PerMethodTrapLimit, 100, \
3086 "Limit on traps (of one kind) in a method (includes inlines)") \
3087 \
3088 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3089 "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3090 \
3091 product(intx, PerBytecodeTrapLimit, 4, \
3092 "Limit on traps (of one kind) at a particular BCI") \
3093 \
3094 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3095 "Extra method data trap entries for speculation") \
3096 \
3097 develop(intx, InlineFrequencyRatio, 20, \
3098 "Ratio of call site execution to caller method invocation") \
3099 \
3100 develop_pd(intx, InlineFrequencyCount, \
3101 "Count of call site execution necessary to trigger frequent " \
3102 "inlining") \
3103 \
3104 develop(intx, InlineThrowCount, 50, \
3105 "Force inlining of interpreted methods that throw this often") \
3106 \
3107 develop(intx, InlineThrowMaxSize, 200, \
3108 "Force inlining of throwing methods smaller than this") \
3109 \
3110 develop(intx, ProfilerNodeSize, 1024, \
3111 "Size in K to allocate for the Profile Nodes of each thread") \
3112 \
3113 product_pd(intx, PreInflateSpin, \
3114 "Number of times to spin wait before inflation") \
3115 \
3116 /* gc parameters */ \
3117 product(uintx, InitialHeapSize, 0, \
3118 "Initial heap size (in bytes); zero means use ergonomics") \
3119 \
3120 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3121 "Maximum heap size (in bytes)") \
3122 \
3123 product(uintx, OldSize, ScaleForWordSize(4*M), \
3124 "Initial tenured generation size (in bytes)") \
3125 \
3126 product(uintx, NewSize, ScaleForWordSize(1*M), \
3127 "Initial new generation size (in bytes)") \
3128 \
3129 product(uintx, MaxNewSize, max_uintx, \
3130 "Maximum new generation size (in bytes), max_uintx means set " \
3131 "ergonomically") \
3132 \
3133 product(uintx, PretenureSizeThreshold, 0, \
3134 "Maximum size in bytes of objects allocated in DefNew " \
3135 "generation; zero means no maximum") \
3136 \
3137 product(uintx, TLABSize, 0, \
3138 "Starting TLAB size (in bytes); zero means set ergonomically") \
3139 \
3140 product(uintx, MinTLABSize, 2*K, \
3141 "Minimum allowed TLAB size (in bytes)") \
3142 \
3143 product(uintx, TLABAllocationWeight, 35, \
3144 "Allocation averaging weight") \
3145 \
3146 product(uintx, TLABWasteTargetPercent, 1, \
3147 "Percentage of Eden that can be wasted") \
3148 \
3149 product(uintx, TLABRefillWasteFraction, 64, \
3150 "Maximum TLAB waste at a refill (internal fragmentation)") \
3151 \
3152 product(uintx, TLABWasteIncrement, 4, \
3153 "Increment allowed waste at slow allocation") \
3154 \
3155 product(uintx, SurvivorRatio, 8, \
3156 "Ratio of eden/survivor space size") \
3157 \
3158 product(uintx, NewRatio, 2, \
3159 "Ratio of old/new generation sizes") \
3160 \
3161 product_pd(uintx, NewSizeThreadIncrease, \
3162 "Additional size added to desired new generation size per " \
3163 "non-daemon thread (in bytes)") \
3164 \
3165 product_pd(uintx, MetaspaceSize, \
3166 "Initial size of Metaspaces (in bytes)") \
3167 \
3168 product(uintx, MaxMetaspaceSize, max_uintx, \
3169 "Maximum size of Metaspaces (in bytes)") \
3170 \
3171 product(uintx, CompressedClassSpaceSize, 1*G, \
3172 "Maximum size of class area in Metaspace when compressed " \
3173 "class pointers are used") \
3174 \
3175 manageable(uintx, MinHeapFreeRatio, 40, \
3176 "The minimum percentage of heap free after GC to avoid expansion."\
3177 " For most GCs this applies to the old generation. In G1 and" \
3178 " ParallelGC it applies to the whole heap.") \
3179 \
3180 manageable(uintx, MaxHeapFreeRatio, 70, \
3181 "The maximum percentage of heap free after GC to avoid shrinking."\
3182 " For most GCs this applies to the old generation. In G1 and" \
3183 " ParallelGC it applies to the whole heap.") \
3184 \
3185 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3186 "Number of milliseconds per MB of free space in the heap") \
3187 \
3188 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3189 "The minimum change in heap space due to GC (in bytes)") \
3190 \
3191 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3192 "The minimum expansion of Metaspace (in bytes)") \
3193 \
3194 product(uintx, MinMetaspaceFreeRatio, 40, \
3195 "The minimum percentage of Metaspace free after GC to avoid " \
3196 "expansion") \
3197 \
3198 product(uintx, MaxMetaspaceFreeRatio, 70, \
3199 "The maximum percentage of Metaspace free after GC to avoid " \
3200 "shrinking") \
3201 \
3202 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3203 "The maximum expansion of Metaspace without full GC (in bytes)") \
3204 \
3205 product(uintx, QueuedAllocationWarningCount, 0, \
3206 "Number of times an allocation that queues behind a GC " \
3207 "will retry before printing a warning") \
3208 \
3209 diagnostic(uintx, VerifyGCStartAt, 0, \
3210 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3211 \
3212 diagnostic(intx, VerifyGCLevel, 0, \
3213 "Generation level at which to start +VerifyBefore/AfterGC") \
3214 \
3215 product(uintx, MaxTenuringThreshold, 15, \
3216 "Maximum value for tenuring threshold") \
3217 \
3218 product(uintx, InitialTenuringThreshold, 7, \
3219 "Initial value for tenuring threshold") \
3220 \
3221 product(uintx, TargetSurvivorRatio, 50, \
3222 "Desired percentage of survivor space used after scavenge") \
3223 \
3224 product(uintx, MarkSweepDeadRatio, 5, \
3225 "Percentage (0-100) of the old gen allowed as dead wood. " \
3226 "Serial mark sweep treats this as both the minimum and maximum " \
3227 "value. " \
3228 "CMS uses this value only if it falls back to mark sweep. " \
3229 "Par compact uses a variable scale based on the density of the " \
3230 "generation and treats this as the maximum value when the heap " \
3231 "is either completely full or completely empty. Par compact " \
3232 "also has a smaller default value; see arguments.cpp.") \
3233 \
3234 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3235 "How often should we fully compact the heap (ignoring the dead " \
3236 "space parameters)") \
3237 \
3238 product(intx, PrintCMSStatistics, 0, \
3239 "Statistics for CMS") \
3240 \
3241 product(bool, PrintCMSInitiationStatistics, false, \
3242 "Statistics for initiating a CMS collection") \
3243 \
3244 product(intx, PrintFLSStatistics, 0, \
3245 "Statistics for CMS' FreeListSpace") \
3246 \
3247 product(intx, PrintFLSCensus, 0, \
3248 "Census for CMS' FreeListSpace") \
3249 \
3250 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3251 "Delay between expansion and allocation (in milliseconds)") \
3252 \
3253 develop(uintx, GCWorkerDelayMillis, 0, \
3254 "Delay in scheduling GC workers (in milliseconds)") \
3255 \
3256 product(intx, DeferThrSuspendLoopCount, 4000, \
3257 "(Unstable) Number of times to iterate in safepoint loop " \
3258 "before blocking VM threads ") \
3259 \
3260 product(intx, DeferPollingPageLoopCount, -1, \
3261 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3262 "before changing safepoint polling page to RO ") \
3263 \
3264 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3265 \
3266 product(bool, PSChunkLargeArrays, true, \
3267 "Process large arrays in chunks") \
3268 \
3269 product(uintx, GCDrainStackTargetSize, 64, \
3270 "Number of entries we will try to leave on the stack " \
3271 "during parallel gc") \
3272 \
3273 /* stack parameters */ \
3274 product_pd(intx, StackYellowPages, \
3275 "Number of yellow zone (recoverable overflows) pages") \
3276 \
3277 product_pd(intx, StackRedPages, \
3278 "Number of red zone (unrecoverable overflows) pages") \
3279 \
3280 product_pd(intx, StackShadowPages, \
3281 "Number of shadow zone (for overflow checking) pages " \
3282 "this should exceed the depth of the VM and native call stack") \
3283 \
3284 product_pd(intx, ThreadStackSize, \
3285 "Thread Stack Size (in Kbytes)") \
3286 \
3287 product_pd(intx, VMThreadStackSize, \
3288 "Non-Java Thread Stack Size (in Kbytes)") \
3289 \
3290 product_pd(intx, CompilerThreadStackSize, \
3291 "Compiler Thread Stack Size (in Kbytes)") \
3292 \
3293 develop_pd(uintx, JVMInvokeMethodSlack, \
3294 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3295 \
3296 product(uintx, ThreadSafetyMargin, 50*M, \
3297 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3298 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3299 "disable this feature") \
3300 \
3301 /* code cache parameters */ \
3302 /* ppc64/tiered compilation has large code-entry alignment. */ \
3303 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3304 "Code cache segment size (in bytes) - smallest unit of " \
3305 "allocation") \
3306 \
3307 develop_pd(intx, CodeEntryAlignment, \
3308 "Code entry alignment for generated code (in bytes)") \
3309 \
3310 product_pd(intx, OptoLoopAlignment, \
3311 "Align inner loops to zero relative to this modulus") \
3312 \
3313 product_pd(uintx, InitialCodeCacheSize, \
3314 "Initial code cache size (in bytes)") \
3315 \
3316 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3317 "Minimum code cache size (in bytes) required to start VM.") \
3318 \
3319 product_pd(uintx, ReservedCodeCacheSize, \
3320 "Reserved code cache size (in bytes) - maximum code cache size") \
3321 \
3322 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3323 "When less than X space left, we stop compiling") \
3324 \
3325 product_pd(uintx, CodeCacheExpansionSize, \
3326 "Code cache expansion size (in bytes)") \
3327 \
3328 develop_pd(uintx, CodeCacheMinBlockLength, \
3329 "Minimum number of segments in a code cache block") \
3330 \
3331 notproduct(bool, ExitOnFullCodeCache, false, \
3332 "Exit the VM if we fill the code cache") \
3333 \
3334 product(bool, UseCodeCacheFlushing, true, \
3335 "Remove cold/old nmethods from the code cache") \
3336 \
3337 /* interpreter debugging */ \
3338 develop(intx, BinarySwitchThreshold, 5, \
3339 "Minimal number of lookupswitch entries for rewriting to binary " \
3340 "switch") \
3341 \
3342 develop(intx, StopInterpreterAt, 0, \
3343 "Stop interpreter execution at specified bytecode number") \
3344 \
3345 develop(intx, TraceBytecodesAt, 0, \
3346 "Trace bytecodes starting with specified bytecode number") \
3347 \
3348 /* compiler interface */ \
3349 develop(intx, CIStart, 0, \
3350 "The id of the first compilation to permit") \
3351 \
3352 develop(intx, CIStop, max_jint, \
3353 "The id of the last compilation to permit") \
3354 \
3355 develop(intx, CIStartOSR, 0, \
3356 "The id of the first osr compilation to permit " \
3357 "(CICountOSR must be on)") \
3358 \
3359 develop(intx, CIStopOSR, max_jint, \
3360 "The id of the last osr compilation to permit " \
3361 "(CICountOSR must be on)") \
3362 \
3363 develop(intx, CIBreakAtOSR, -1, \
3364 "The id of osr compilation to break at") \
3365 \
3366 develop(intx, CIBreakAt, -1, \
3367 "The id of compilation to break at") \
3368 \
3369 product(ccstrlist, CompileOnly, "", \
3370 "List of methods (pkg/class.name) to restrict compilation to") \
3371 \
3372 product(ccstr, CompileCommandFile, NULL, \
3373 "Read compiler commands from this file [.hotspot_compiler]") \
3374 \
3375 product(ccstrlist, CompileCommand, "", \
3376 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3377 \
3378 develop(bool, ReplayCompiles, false, \
3379 "Enable replay of compilations from ReplayDataFile") \
3380 \
3381 product(ccstr, ReplayDataFile, NULL, \
3382 "File containing compilation replay information" \
3383 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3384 \
3385 product(ccstr, InlineDataFile, NULL, \
3386 "File containing inlining replay information" \
3387 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3388 \
3389 develop(intx, ReplaySuppressInitializers, 2, \
3390 "Control handling of class initialization during replay: " \
3391 "0 - don't do anything special; " \
3392 "1 - treat all class initializers as empty; " \
3393 "2 - treat class initializers for application classes as empty; " \
3394 "3 - allow all class initializers to run during bootstrap but " \
3395 " pretend they are empty after starting replay") \
3396 \
3397 develop(bool, ReplayIgnoreInitErrors, false, \
3398 "Ignore exceptions thrown during initialization for replay") \
3399 \
3400 product(bool, DumpReplayDataOnError, true, \
3401 "Record replay data for crashing compiler threads") \
3402 \
3403 product(bool, CICompilerCountPerCPU, false, \
3404 "1 compiler thread for log(N CPUs)") \
3405 \
3406 develop(intx, CIFireOOMAt, -1, \
3407 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3408 "(non-negative value throws OOM after this many CI accesses " \
3409 "in each compile)") \
3410 notproduct(intx, CICrashAt, -1, \
3411 "id of compilation to trigger assert in compiler thread for " \
3412 "the purpose of testing, e.g. generation of replay data") \
3413 notproduct(bool, CIObjectFactoryVerify, false, \
3414 "enable potentially expensive verification in ciObjectFactory") \
3415 \
3416 /* Priorities */ \
3417 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3418 \
3419 product(intx, ThreadPriorityPolicy, 0, \
3420 "0 : Normal. "\
3421 " VM chooses priorities that are appropriate for normal "\
3422 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3423 " to normal native priority. Java priorities below " \
3424 " NORM_PRIORITY map to lower native priority values. On "\
3425 " Windows applications are allowed to use higher native "\
3426 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3427 " not use the highest possible native priority, "\
3428 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3429 " system threads. On Linux thread priorities are ignored "\
3430 " because the OS does not support static priority in "\
3431 " SCHED_OTHER scheduling class which is the only choice for "\
3432 " non-root, non-realtime applications. "\
3433 "1 : Aggressive. "\
3434 " Java thread priorities map over to the entire range of "\
3435 " native thread priorities. Higher Java thread priorities map "\
3436 " to higher native thread priorities. This policy should be "\
3437 " used with care, as sometimes it can cause performance "\
3438 " degradation in the application and/or the entire system. On "\
3439 " Linux this policy requires root privilege.") \
3440 \
3441 product(bool, ThreadPriorityVerbose, false, \
3442 "Print priority changes") \
3443 \
3444 product(intx, DefaultThreadPriority, -1, \
3445 "The native priority at which threads run if not elsewhere " \
3446 "specified (-1 means no change)") \
3447 \
3448 product(intx, CompilerThreadPriority, -1, \
3449 "The native priority at which compiler threads should run " \
3450 "(-1 means no change)") \
3451 \
3452 product(intx, VMThreadPriority, -1, \
3453 "The native priority at which the VM thread should run " \
3454 "(-1 means no change)") \
3455 \
3456 product(bool, CompilerThreadHintNoPreempt, true, \
3457 "(Solaris only) Give compiler threads an extra quanta") \
3458 \
3459 product(bool, VMThreadHintNoPreempt, false, \
3460 "(Solaris only) Give VM thread an extra quanta") \
3461 \
3462 product(intx, JavaPriority1_To_OSPriority, -1, \
3463 "Map Java priorities to OS priorities") \
3464 \
3465 product(intx, JavaPriority2_To_OSPriority, -1, \
3466 "Map Java priorities to OS priorities") \
3467 \
3468 product(intx, JavaPriority3_To_OSPriority, -1, \
3469 "Map Java priorities to OS priorities") \
3470 \
3471 product(intx, JavaPriority4_To_OSPriority, -1, \
3472 "Map Java priorities to OS priorities") \
3473 \
3474 product(intx, JavaPriority5_To_OSPriority, -1, \
3475 "Map Java priorities to OS priorities") \
3476 \
3477 product(intx, JavaPriority6_To_OSPriority, -1, \
3478 "Map Java priorities to OS priorities") \
3479 \
3480 product(intx, JavaPriority7_To_OSPriority, -1, \
3481 "Map Java priorities to OS priorities") \
3482 \
3483 product(intx, JavaPriority8_To_OSPriority, -1, \
3484 "Map Java priorities to OS priorities") \
3485 \
3486 product(intx, JavaPriority9_To_OSPriority, -1, \
3487 "Map Java priorities to OS priorities") \
3488 \
3489 product(intx, JavaPriority10_To_OSPriority,-1, \
3490 "Map Java priorities to OS priorities") \
3491 \
3492 experimental(bool, UseCriticalJavaThreadPriority, false, \
3493 "Java thread priority 10 maps to critical scheduling priority") \
3494 \
3495 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3496 "Compiler thread(s) run at critical scheduling priority") \
3497 \
3498 experimental(bool, UseCriticalCMSThreadPriority, false, \
3499 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3500 \
3501 /* compiler debugging */ \
3502 notproduct(intx, CompileTheWorldStartAt, 1, \
3503 "First class to consider when using +CompileTheWorld") \
3504 \
3505 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3506 "Last class to consider when using +CompileTheWorld") \
3507 \
3508 develop(intx, NewCodeParameter, 0, \
3509 "Testing Only: Create a dedicated integer parameter before " \
3510 "putback") \
3511 \
3512 /* new oopmap storage allocation */ \
3513 develop(intx, MinOopMapAllocation, 8, \
3514 "Minimum number of OopMap entries in an OopMapSet") \
3515 \
3516 /* Background Compilation */ \
3517 develop(intx, LongCompileThreshold, 50, \
3518 "Used with +TraceLongCompiles") \
3519 \
3520 product(intx, StarvationMonitorInterval, 200, \
3521 "Pause between each check (in milliseconds)") \
3522 \
3523 /* recompilation */ \
3524 product_pd(intx, CompileThreshold, \
3525 "number of interpreted method invocations before (re-)compiling") \
3526 \
3527 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3528 "Interpreter (tier 0) invocation notification frequency") \
3529 \
3530 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3531 "C1 without MDO (tier 2) invocation notification frequency") \
3532 \
3533 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3534 "C1 with MDO profiling (tier 3) invocation notification " \
3535 "frequency") \
3536 \
3537 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3538 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3539 \
3540 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3541 "Interpreter (tier 0) invocation notification frequency") \
3542 \
3543 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3544 "C1 without MDO (tier 2) invocation notification frequency") \
3545 \
3546 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3547 "C1 with MDO profiling (tier 3) invocation notification " \
3548 "frequency") \
3549 \
3550 product(intx, Tier2CompileThreshold, 0, \
3551 "threshold at which tier 2 compilation is invoked") \
3552 \
3553 product(intx, Tier2BackEdgeThreshold, 0, \
3554 "Back edge threshold at which tier 2 compilation is invoked") \
3555 \
3556 product(intx, Tier3InvocationThreshold, 200, \
3557 "Compile if number of method invocations crosses this " \
3558 "threshold") \
3559 \
3560 product(intx, Tier3MinInvocationThreshold, 100, \
3561 "Minimum invocation to compile at tier 3") \
3562 \
3563 product(intx, Tier3CompileThreshold, 2000, \
3564 "Threshold at which tier 3 compilation is invoked (invocation " \
3565 "minimum must be satisfied") \
3566 \
3567 product(intx, Tier3BackEdgeThreshold, 60000, \
3568 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3569 \
3570 product(intx, Tier4InvocationThreshold, 5000, \
3571 "Compile if number of method invocations crosses this " \
3572 "threshold") \
3573 \
3574 product(intx, Tier4MinInvocationThreshold, 600, \
3575 "Minimum invocation to compile at tier 4") \
3576 \
3577 product(intx, Tier4CompileThreshold, 15000, \
3578 "Threshold at which tier 4 compilation is invoked (invocation " \
3579 "minimum must be satisfied") \
3580 \
3581 product(intx, Tier4BackEdgeThreshold, 40000, \
3582 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3583 \
3584 product(intx, Tier3DelayOn, 5, \
3585 "If C2 queue size grows over this amount per compiler thread " \
3586 "stop compiling at tier 3 and start compiling at tier 2") \
3587 \
3588 product(intx, Tier3DelayOff, 2, \
3589 "If C2 queue size is less than this amount per compiler thread " \
3590 "allow methods compiled at tier 2 transition to tier 3") \
3591 \
3592 product(intx, Tier3LoadFeedback, 5, \
3593 "Tier 3 thresholds will increase twofold when C1 queue size " \
3594 "reaches this amount per compiler thread") \
3595 \
3596 product(intx, Tier4LoadFeedback, 3, \
3597 "Tier 4 thresholds will increase twofold when C2 queue size " \
3598 "reaches this amount per compiler thread") \
3599 \
3600 product(intx, TieredCompileTaskTimeout, 50, \
3601 "Kill compile task if method was not used within " \
3602 "given timeout in milliseconds") \
3603 \
3604 product(intx, TieredStopAtLevel, 4, \
3605 "Stop at given compilation level") \
3606 \
3607 product(intx, Tier0ProfilingStartPercentage, 200, \
3608 "Start profiling in interpreter if the counters exceed tier 3 " \
3609 "thresholds by the specified percentage") \
3610 \
3611 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3612 "Increase the compile threshold for C1 compilation if the code " \
3613 "cache is filled by the specified percentage") \
3614 \
3615 product(intx, TieredRateUpdateMinTime, 1, \
3616 "Minimum rate sampling interval (in milliseconds)") \
3617 \
3618 product(intx, TieredRateUpdateMaxTime, 25, \
3619 "Maximum rate sampling interval (in milliseconds)") \
3620 \
3621 product_pd(bool, TieredCompilation, \
3622 "Enable tiered compilation") \
3623 \
3624 product(bool, PrintTieredEvents, false, \
3625 "Print tiered events notifications") \
3626 \
3627 product_pd(intx, OnStackReplacePercentage, \
3628 "NON_TIERED number of method invocations/branches (expressed as " \
3629 "% of CompileThreshold) before (re-)compiling OSR code") \
3630 \
3631 product(intx, InterpreterProfilePercentage, 33, \
3632 "NON_TIERED number of method invocations/branches (expressed as " \
3633 "% of CompileThreshold) before profiling in the interpreter") \
3634 \
3635 develop(intx, MaxRecompilationSearchLength, 10, \
3636 "The maximum number of frames to inspect when searching for " \
3637 "recompilee") \
3638 \
3639 develop(intx, MaxInterpretedSearchLength, 3, \
3640 "The maximum number of interpreted frames to skip when searching "\
3641 "for recompilee") \
3642 \
3643 develop(intx, DesiredMethodLimit, 8000, \
3644 "The desired maximum method size (in bytecodes) after inlining") \
3645 \
3646 develop(intx, HugeMethodLimit, 8000, \
3647 "Don't compile methods larger than this if " \
3648 "+DontCompileHugeMethods") \
3649 \
3650 /* New JDK 1.4 reflection implementation */ \
3651 \
3652 develop(bool, UseNewReflection, true, \
3653 "Temporary flag for transition to reflection based on dynamic " \
3654 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3655 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3656 "changes were needed") \
3657 \
3658 develop(bool, VerifyReflectionBytecodes, false, \
3659 "Force verification of 1.4 reflection bytecodes. Does not work " \
3660 "in situations like that described in 4486457 or for " \
3661 "constructors generated for serialization, so can not be enabled "\
3662 "in product.") \
3663 \
3664 product(bool, ReflectionWrapResolutionErrors, true, \
3665 "Temporary flag for transition to AbstractMethodError wrapped " \
3666 "in InvocationTargetException. See 6531596") \
3667 \
3668 develop(intx, FastSuperclassLimit, 8, \
3669 "Depth of hardwired instanceof accelerator array") \
3670 \
3671 /* Properties for Java libraries */ \
3672 \
3673 product(uintx, MaxDirectMemorySize, 0, \
3674 "Maximum total size of NIO direct-buffer allocations") \
3675 \
3676 /* Flags used for temporary code during development */ \
3677 \
3678 diagnostic(bool, UseNewCode, false, \
3679 "Testing Only: Use the new version while testing") \
3680 \
3681 diagnostic(bool, UseNewCode2, false, \
3682 "Testing Only: Use the new version while testing") \
3683 \
3684 diagnostic(bool, UseNewCode3, false, \
3685 "Testing Only: Use the new version while testing") \
3686 \
3687 /* flags for performance data collection */ \
3688 \
3689 product(bool, UsePerfData, falseInEmbedded, \
3690 "Flag to disable jvmstat instrumentation for performance testing "\
3691 "and problem isolation purposes") \
3692 \
3693 product(bool, PerfDataSaveToFile, false, \
3694 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3695 \
3696 product(ccstr, PerfDataSaveFile, NULL, \
3697 "Save PerfData memory to the specified absolute pathname. " \
3698 "The string %p in the file name (if present) " \
3699 "will be replaced by pid") \
3700 \
3701 product(intx, PerfDataSamplingInterval, 50, \
3702 "Data sampling interval (in milliseconds)") \
3703 \
3704 develop(bool, PerfTraceDataCreation, false, \
3705 "Trace creation of Performance Data Entries") \
3706 \
3707 develop(bool, PerfTraceMemOps, false, \
3708 "Trace PerfMemory create/attach/detach calls") \
3709 \
3710 product(bool, PerfDisableSharedMem, false, \
3711 "Store performance data in standard memory") \
3712 \
3713 product(intx, PerfDataMemorySize, 32*K, \
3714 "Size of performance data memory region. Will be rounded " \
3715 "up to a multiple of the native os page size.") \
3716 \
3717 product(intx, PerfMaxStringConstLength, 1024, \
3718 "Maximum PerfStringConstant string length before truncation") \
3719 \
3720 product(bool, PerfAllowAtExitRegistration, false, \
3721 "Allow registration of atexit() methods") \
3722 \
3723 product(bool, PerfBypassFileSystemCheck, false, \
3724 "Bypass Win32 file system criteria checks (Windows Only)") \
3725 \
3726 product(intx, UnguardOnExecutionViolation, 0, \
3727 "Unguard page and retry on no-execute fault (Win32 only) " \
3728 "0=off, 1=conservative, 2=aggressive") \
3729 \
3730 /* Serviceability Support */ \
3731 \
3732 product(bool, ManagementServer, false, \
3733 "Create JMX Management Server") \
3734 \
3735 product(bool, DisableAttachMechanism, false, \
3736 "Disable mechanism that allows tools to attach to this VM") \
3737 \
3738 product(bool, StartAttachListener, false, \
3739 "Always start Attach Listener at VM startup") \
3740 \
3741 manageable(bool, PrintConcurrentLocks, false, \
3742 "Print java.util.concurrent locks in thread dump") \
3743 \
3744 product(bool, TransmitErrorReport, false, \
3745 "Enable error report transmission on erroneous termination") \
3746 \
3747 product(ccstr, ErrorReportServer, NULL, \
3748 "Override built-in error report server address") \
3749 \
3750 /* Shared spaces */ \
3751 \
3752 product(bool, UseSharedSpaces, true, \
3753 "Use shared spaces for metadata") \
3754 \
3755 product(bool, RequireSharedSpaces, false, \
3756 "Require shared spaces for metadata") \
3757 \
3758 product(bool, DumpSharedSpaces, false, \
3759 "Special mode: JVM reads a class list, loads classes, builds " \
3760 "shared spaces, and dumps the shared spaces to a file to be " \
3761 "used in future JVM runs") \
3762 \
3763 product(bool, PrintSharedSpaces, false, \
3764 "Print usage of shared spaces") \
3765 \
3766 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3767 "Size of read-write space for metadata (in bytes)") \
3768 \
3769 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3770 "Size of read-only space for metadata (in bytes)") \
3771 \
3772 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3773 "Size of the shared miscellaneous data area (in bytes)") \
3774 \
3775 product(uintx, SharedMiscCodeSize, 120*K, \
3776 "Size of the shared miscellaneous code area (in bytes)") \
3777 \
3778 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3779 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3780 "Address to allocate shared memory region for class data") \
3781 \
3782 diagnostic(bool, PrintMethodHandleStubs, false, \
3783 "Print generated stub code for method handles") \
3784 \
3785 develop(bool, TraceMethodHandles, false, \
3786 "trace internal method handle operations") \
3787 \
3788 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3789 "perform extra checks when constructing method handles") \
3790 \
3791 diagnostic(bool, ShowHiddenFrames, false, \
3792 "show method handle implementation frames (usually hidden)") \
3793 \
3794 experimental(bool, TrustFinalNonStaticFields, false, \
3795 "trust final non-static declarations for constant folding") \
3796 \
3797 diagnostic(bool, FoldStableValues, true, \
3798 "Optimize loads from stable fields (marked w/ @Stable)") \
3799 \
3800 develop(bool, TraceInvokeDynamic, false, \
3801 "trace internal invoke dynamic operations") \
3802 \
3803 diagnostic(bool, PauseAtStartup, false, \
3804 "Causes the VM to pause at startup time and wait for the pause " \
3805 "file to be removed (default: ./vm.paused.<pid>)") \
3806 \
3807 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3808 "The file to create and for whose removal to await when pausing " \
3809 "at startup. (default: ./vm.paused.<pid>)") \
3810 \
3811 diagnostic(bool, PauseAtExit, false, \
3812 "Pause and wait for keypress on exit if a debugger is attached") \
3813 \
3814 product(bool, ExtendedDTraceProbes, false, \
3815 "Enable performance-impacting dtrace probes") \
3816 \
3817 product(bool, DTraceMethodProbes, false, \
3818 "Enable dtrace probes for method-entry and method-exit") \
3819 \
3820 product(bool, DTraceAllocProbes, false, \
3821 "Enable dtrace probes for object allocation") \
3822 \
3823 product(bool, DTraceMonitorProbes, false, \
3824 "Enable dtrace probes for monitor events") \
3825 \
3826 product(bool, RelaxAccessControlCheck, false, \
3827 "Relax the access control checks in the verifier") \
3828 \
3829 diagnostic(bool, PrintDTraceDOF, false, \
3830 "Print the DTrace DOF passed to the system for JSDT probes") \
3831 \
3832 product(uintx, StringTableSize, defaultStringTableSize, \
3833 "Number of buckets in the interned String table") \
3834 \
3835 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
3836 "Number of buckets in the JVM internal Symbol table") \
3837 \
3838 product(bool, UseStringDeduplication, false, \
3839 "Use string deduplication") \
3840 \
3841 product(bool, PrintStringDeduplicationStatistics, false, \
3842 "Print string deduplication statistics") \
3843 \
3844 product(uintx, StringDeduplicationAgeThreshold, 3, \
3845 "A string must reach this age (or be promoted to an old region) " \
3846 "to be considered for deduplication") \
3847 \
3848 diagnostic(bool, StringDeduplicationResizeALot, false, \
3849 "Force table resize every time the table is scanned") \
3850 \
3851 diagnostic(bool, StringDeduplicationRehashALot, false, \
3852 "Force table rehash every time the table is scanned") \
3853 \
3854 develop(bool, TraceDefaultMethods, false, \
3855 "Trace the default method processing steps") \
3856 \
3857 develop(bool, VerifyGenericSignatures, false, \
3858 "Abort VM on erroneous or inconsistent generic signatures") \
3859 \
3860 diagnostic(bool, WhiteBoxAPI, false, \
3861 "Enable internal testing APIs") \
3862 \
3863 product(bool, PrintGCCause, true, \
3864 "Include GC cause in GC logging") \
3865 \
3866 product(bool , AllowNonVirtualCalls, false, \
3867 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3868 \
3869 diagnostic(ccstr, SharedArchiveFile, NULL, \
3870 "Override the default location of the CDS archive file") \
3871 \
3872 experimental(uintx, ArrayAllocatorMallocLimit, \
3873 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3874 "Allocation less than this value will be allocated " \
3875 "using malloc. Larger allocations will use mmap.") \
3876 \
3877 experimental(bool, AlwaysAtomicAccesses, false, \
3878 "Accesses to all variables should always be atomic") \
3879 \
3880 product(bool, EnableTracing, false, \
3881 "Enable event-based tracing") \
3882 \
3883 product(bool, UseLockedTracing, false, \
3884 "Use locked-tracing when doing event-based tracing")
3885
3886 /*
3887 * Macros for factoring of globals
3888 */
3889
3890 // Interface macros
3891 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3892 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3893 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3894 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3895 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3896 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3897 #ifdef PRODUCT
3898 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
3899 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
3900 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
3901 #else
3902 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3903 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3904 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3905 #endif
3906 // Special LP64 flags, product only needed for now.
3907 #ifdef _LP64
3908 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3909 #else
3910 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3911 #endif // _LP64
3912
3913 // Implementation macros
3914 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3915 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3916 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3917 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3918 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3919 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3920 #ifdef PRODUCT
3921 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
3922 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
3923 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
3924 #else
3925 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3926 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3927 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3928 #endif
3929 #ifdef _LP64
3930 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3931 #else
3932 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3933 #endif // _LP64
3934
3935 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3936
3937 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3938
3939 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3940
3941 // Extensions
3942
3943 #include "runtime/globals_ext.hpp"
3944
3945 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP