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