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