1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/debug.hpp"
29
30 // use this for flags that are true per default in the tiered build
31 // but false in non-tiered builds, and vice versa
32 #ifdef TIERED
33 #define trueInTiered true
34 #define falseInTiered false
35 #else
36 #define trueInTiered false
37 #define falseInTiered true
38 #endif
39
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_linux
56 # include "globals_linux.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_solaris
59 # include "globals_solaris.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_windows
62 # include "globals_windows.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_bsd
65 # include "globals_bsd.hpp"
66 #endif
67 #ifdef TARGET_OS_ARCH_linux_x86
68 # include "globals_linux_x86.hpp"
69 #endif
70 #ifdef TARGET_OS_ARCH_linux_sparc
71 # include "globals_linux_sparc.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_zero
74 # include "globals_linux_zero.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_solaris_x86
77 # include "globals_solaris_x86.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_solaris_sparc
80 # include "globals_solaris_sparc.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_windows_x86
83 # include "globals_windows_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_linux_arm
86 # include "globals_linux_arm.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_linux_ppc
89 # include "globals_linux_ppc.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_bsd_x86
92 # include "globals_bsd_x86.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_bsd_zero
95 # include "globals_bsd_zero.hpp"
96 #endif
97 #ifdef COMPILER1
98 #ifdef TARGET_ARCH_x86
99 # include "c1_globals_x86.hpp"
100 #endif
101 #ifdef TARGET_ARCH_sparc
102 # include "c1_globals_sparc.hpp"
103 #endif
104 #ifdef TARGET_ARCH_arm
105 # include "c1_globals_arm.hpp"
106 #endif
107 #ifdef TARGET_ARCH_ppc
108 # include "c1_globals_ppc.hpp"
109 #endif
110 #ifdef TARGET_OS_FAMILY_linux
111 # include "c1_globals_linux.hpp"
112 #endif
113 #ifdef TARGET_OS_FAMILY_solaris
114 # include "c1_globals_solaris.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_windows
117 # include "c1_globals_windows.hpp"
118 #endif
119 #ifdef TARGET_OS_FAMILY_bsd
120 # include "c1_globals_bsd.hpp"
121 #endif
122 #endif
123 #ifdef COMPILER2
124 #ifdef TARGET_ARCH_x86
125 # include "c2_globals_x86.hpp"
126 #endif
127 #ifdef TARGET_ARCH_sparc
128 # include "c2_globals_sparc.hpp"
129 #endif
130 #ifdef TARGET_ARCH_arm
131 # include "c2_globals_arm.hpp"
132 #endif
133 #ifdef TARGET_OS_FAMILY_linux
134 # include "c2_globals_linux.hpp"
135 #endif
136 #ifdef TARGET_OS_FAMILY_solaris
137 # include "c2_globals_solaris.hpp"
138 #endif
139 #ifdef TARGET_OS_FAMILY_windows
140 # include "c2_globals_windows.hpp"
141 #endif
142 #ifdef TARGET_OS_FAMILY_bsd
143 # include "c2_globals_bsd.hpp"
144 #endif
145 #endif
146 #ifdef SHARK
147 #ifdef TARGET_ARCH_zero
148 # include "shark_globals_zero.hpp"
149 #endif
150 #endif
151
152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
153 define_pd_global(bool, BackgroundCompilation, false);
154 define_pd_global(bool, UseTLAB, false);
155 define_pd_global(bool, CICompileOSR, false);
156 define_pd_global(bool, UseTypeProfile, false);
157 define_pd_global(bool, UseOnStackReplacement, false);
158 define_pd_global(bool, InlineIntrinsics, false);
159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
160 define_pd_global(bool, ProfileInterpreter, false);
161 define_pd_global(bool, ProfileTraps, false);
162 define_pd_global(bool, TieredCompilation, false);
163
164 define_pd_global(intx, CompileThreshold, 0);
165 define_pd_global(intx, BackEdgeThreshold, 0);
166
167 define_pd_global(intx, OnStackReplacePercentage, 0);
168 define_pd_global(bool, ResizeTLAB, false);
169 define_pd_global(intx, FreqInlineSize, 0);
170 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
171 define_pd_global(intx, InlineClassNatives, true);
172 define_pd_global(intx, InlineUnsafeOps, true);
173 define_pd_global(intx, InitialCodeCacheSize, 160*K);
174 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
175 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
176 define_pd_global(intx, CodeCacheMinBlockLength, 1);
177 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
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(const char* name, size_t length, bool allow_locked = false);
224 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
225
226 bool is_bool() const { return strcmp(type, "bool") == 0; }
227 bool get_bool() const { return *((bool*) addr); }
228 void set_bool(bool value) { *((bool*) addr) = value; }
229
230 bool is_intx() const { return strcmp(type, "intx") == 0; }
231 intx get_intx() const { return *((intx*) addr); }
232 void set_intx(intx value) { *((intx*) addr) = value; }
233
234 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
235 uintx get_uintx() const { return *((uintx*) addr); }
236 void set_uintx(uintx value) { *((uintx*) addr) = value; }
237
238 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
239 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
240 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
241
242 bool is_double() const { return strcmp(type, "double") == 0; }
243 double get_double() const { return *((double*) addr); }
244 void set_double(double value) { *((double*) addr) = value; }
245
246 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
247 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
248 ccstr get_ccstr() const { return *((ccstr*) addr); }
249 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
250
251 bool is_unlocker() const;
252 bool is_unlocked() const;
253 bool is_writeable() const;
254 bool is_external() const;
255
256 bool is_unlocker_ext() const;
257 bool is_unlocked_ext() const;
258 bool is_writeable_ext() const;
259 bool is_external_ext() const;
260
261 void get_locked_message(char*, int) const;
262 void get_locked_message_ext(char*, int) const;
263
264 void print_on(outputStream* st, bool withComments = false );
265 void print_as_flag(outputStream* st);
266 };
267
268 // debug flags control various aspects of the VM and are global accessible
269
270 // use FlagSetting to temporarily change some debug flag
271 // e.g. FlagSetting fs(DebugThisAndThat, true);
272 // restored to previous value upon leaving scope
273 class FlagSetting {
274 bool val;
275 bool* flag;
276 public:
277 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
278 ~FlagSetting() { *flag = val; }
279 };
280
281
282 class CounterSetting {
283 intx* counter;
284 public:
285 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
286 ~CounterSetting() { (*counter)--; }
287 };
288
289
290 class UIntFlagSetting {
291 uintx val;
292 uintx* flag;
293 public:
294 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
295 ~UIntFlagSetting() { *flag = val; }
296 };
297
298
299 class DoubleFlagSetting {
300 double val;
301 double* flag;
302 public:
303 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
304 ~DoubleFlagSetting() { *flag = val; }
305 };
306
307
308 class CommandLineFlags {
309 public:
310 static bool boolAt(char* name, size_t len, bool* value);
311 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
312 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
313 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
314
315 static bool intxAt(char* name, size_t len, intx* value);
316 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
317 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
318 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
319
320 static bool uintxAt(char* name, size_t len, uintx* value);
321 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
322 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
323 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
324
325 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
326 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
327 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
328 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
329
330 static bool doubleAt(char* name, size_t len, double* value);
331 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
332 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
333 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
334
335 static bool ccstrAt(char* name, size_t len, ccstr* value);
336 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
337 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
338 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
339
340 // Returns false if name is not a command line flag.
341 static bool wasSetOnCmdline(const char* name, bool* value);
342 static void printSetFlags(outputStream* out);
343
344 static void printFlags(outputStream* out, bool withComments);
345
346 static void verify() PRODUCT_RETURN;
347 };
348
349 // use this for flags that are true by default in the debug version but
350 // false in the optimized version, and vice versa
351 #ifdef ASSERT
352 #define trueInDebug true
353 #define falseInDebug false
354 #else
355 #define trueInDebug false
356 #define falseInDebug true
357 #endif
358
359 // use this for flags that are true per default in the product build
360 // but false in development builds, and vice versa
361 #ifdef PRODUCT
362 #define trueInProduct true
363 #define falseInProduct false
364 #else
365 #define trueInProduct false
366 #define falseInProduct true
367 #endif
368
369 #ifdef JAVASE_EMBEDDED
370 #define falseInEmbedded false
371 #else
372 #define falseInEmbedded true
373 #endif
374
375 // develop flags are settable / visible only during development and are constant in the PRODUCT version
376 // product flags are always settable / visible
377 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
378
379 // A flag must be declared with one of the following types:
380 // bool, intx, uintx, ccstr.
381 // The type "ccstr" is an alias for "const char*" and is used
382 // only in this file, because the macrology requires single-token type names.
383
384 // Note: Diagnostic options not meant for VM tuning or for product modes.
385 // They are to be used for VM quality assurance or field diagnosis
386 // of VM bugs. They are hidden so that users will not be encouraged to
387 // try them as if they were VM ordinary execution options. However, they
388 // are available in the product version of the VM. Under instruction
389 // from support engineers, VM customers can turn them on to collect
390 // diagnostic information about VM problems. To use a VM diagnostic
391 // option, you must first specify +UnlockDiagnosticVMOptions.
392 // (This master switch also affects the behavior of -Xprintflags.)
393 //
394 // experimental flags are in support of features that are not
395 // part of the officially supported product, but are available
396 // for experimenting with. They could, for example, be performance
397 // features that may not have undergone full or rigorous QA, but which may
398 // help performance in some cases and released for experimentation
399 // by the community of users and developers. This flag also allows one to
400 // be able to build a fully supported product that nonetheless also
401 // ships with some unsupported, lightly tested, experimental features.
402 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
403 // UnlockExperimentalVMOptions flag, which allows the control and
404 // modification of the experimental flags.
405 //
406 // Nota bene: neither diagnostic nor experimental options should be used casually,
407 // and they are not supported on production loads, except under explicit
408 // direction from support engineers.
409 //
410 // manageable flags are writeable external product flags.
411 // They are dynamically writeable through the JDK management interface
412 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
413 // These flags are external exported interface (see CCC). The list of
414 // manageable flags can be queried programmatically through the management
415 // interface.
416 //
417 // A flag can be made as "manageable" only if
418 // - the flag is defined in a CCC as an external exported interface.
419 // - the VM implementation supports dynamic setting of the flag.
420 // This implies that the VM must *always* query the flag variable
421 // and not reuse state related to the flag state at any given time.
422 // - you want the flag to be queried programmatically by the customers.
423 //
424 // product_rw flags are writeable internal product flags.
425 // They are like "manageable" flags but for internal/private use.
426 // The list of product_rw flags are internal/private flags which
427 // may be changed/removed in a future release. It can be set
428 // through the management interface to get/set value
429 // when the name of flag is supplied.
430 //
431 // A flag can be made as "product_rw" only if
432 // - the VM implementation supports dynamic setting of the flag.
433 // This implies that the VM must *always* query the flag variable
434 // and not reuse state related to the flag state at any given time.
435 //
436 // Note that when there is a need to support develop flags to be writeable,
437 // it can be done in the same way as product_rw.
438
439 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
440 \
441 lp64_product(bool, UseCompressedOops, false, \
442 "Use 32-bit object references in 64-bit VM " \
443 "lp64_product means flag is always constant in 32 bit VM") \
444 \
445 lp64_product(bool, UseCompressedKlassPointers, false, \
446 "Use 32-bit klass pointers in 64-bit VM " \
447 "lp64_product means flag is always constant in 32 bit VM") \
448 \
449 notproduct(bool, CheckCompressedOops, true, \
450 "generate checks in encoding/decoding code in debug VM") \
451 \
452 product_pd(uintx, HeapBaseMinAddress, \
453 "OS specific low limit for heap base address") \
454 \
455 diagnostic(bool, PrintCompressedOopsMode, false, \
456 "Print compressed oops base address and encoding mode") \
457 \
458 lp64_product(intx, ObjectAlignmentInBytes, 8, \
459 "Default object alignment in bytes, 8 is minimum") \
460 \
461 product(bool, AssumeMP, false, \
462 "Instruct the VM to assume multiple processors are available") \
463 \
464 /* UseMembar is theoretically a temp flag used for memory barrier \
465 * removal testing. It was supposed to be removed before FCS but has \
466 * been re-added (see 6401008) */ \
467 product_pd(bool, UseMembar, \
468 "(Unstable) Issues membars on thread state transitions") \
469 \
470 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
471 * that don't support it. This will be replaced by processor detection \
472 * logic. \
473 */ \
474 product(bool, UsePPCLWSYNC, true, \
475 "Use lwsync instruction if true, else use slower sync") \
476 \
477 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
478 "Whether to clean the chunk pool asynchronously") \
479 \
480 /* Temporary: See 6948537 */ \
481 experimental(bool, UseMemSetInBOT, true, \
482 "(Unstable) uses memset in BOT updates in GC code") \
483 \
484 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
485 "Enable normal processing of flags relating to field diagnostics")\
486 \
487 experimental(bool, UnlockExperimentalVMOptions, false, \
488 "Enable normal processing of flags relating to experimental features")\
489 \
490 product(bool, JavaMonitorsInStackTrace, true, \
491 "Print info. about Java monitor locks when the stacks are dumped")\
492 \
493 product_pd(bool, UseLargePages, \
494 "Use large page memory") \
495 \
496 product_pd(bool, UseLargePagesIndividualAllocation, \
497 "Allocate large pages individually for better affinity") \
498 \
499 develop(bool, LargePagesIndividualAllocationInjectError, false, \
500 "Fail large pages individual allocation") \
501 \
502 develop(bool, TracePageSizes, false, \
503 "Trace page size selection and usage.") \
504 \
505 product(bool, UseNUMA, false, \
506 "Use NUMA if available") \
507 \
508 product(bool, UseNUMAInterleaving, false, \
509 "Interleave memory across NUMA nodes if available") \
510 \
511 product(uintx, NUMAInterleaveGranularity, 2*M, \
512 "Granularity to use for NUMA interleaving on Windows OS") \
513 \
514 product(bool, ForceNUMA, false, \
515 "Force NUMA optimizations on single-node/UMA systems") \
516 \
517 product(uintx, NUMAChunkResizeWeight, 20, \
518 "Percentage (0-100) used to weigh the current sample when " \
519 "computing exponentially decaying average for " \
520 "AdaptiveNUMAChunkSizing") \
521 \
522 product(uintx, NUMASpaceResizeRate, 1*G, \
523 "Do not reallocate more that this amount per collection") \
524 \
525 product(bool, UseAdaptiveNUMAChunkSizing, true, \
526 "Enable adaptive chunk sizing for NUMA") \
527 \
528 product(bool, NUMAStats, false, \
529 "Print NUMA stats in detailed heap information") \
530 \
531 product(uintx, NUMAPageScanRate, 256, \
532 "Maximum number of pages to include in the page scan procedure") \
533 \
534 product_pd(bool, NeedsDeoptSuspend, \
535 "True for register window machines (sparc/ia64)") \
536 \
537 product(intx, UseSSE, 99, \
538 "Highest supported SSE instructions set on x86/x64") \
539 \
540 product(bool, UseAES, false, \
541 "Control whether AES instructions can be used on x86/x64") \
542 \
543 product(uintx, LargePageSizeInBytes, 0, \
544 "Large page size (0 to let VM choose the page size") \
545 \
546 product(uintx, LargePageHeapSizeThreshold, 128*M, \
547 "Use large pages if max heap is at least this big") \
548 \
549 product(bool, ForceTimeHighResolution, false, \
550 "Using high time resolution(For Win32 only)") \
551 \
552 develop(bool, TraceItables, false, \
553 "Trace initialization and use of itables") \
554 \
555 develop(bool, TracePcPatching, false, \
556 "Trace usage of frame::patch_pc") \
557 \
558 develop(bool, TraceJumps, false, \
559 "Trace assembly jumps in thread ring buffer") \
560 \
561 develop(bool, TraceRelocator, false, \
562 "Trace the bytecode relocator") \
563 \
564 develop(bool, TraceLongCompiles, false, \
565 "Print out every time compilation is longer than " \
566 "a given threashold") \
567 \
568 develop(bool, SafepointALot, false, \
569 "Generates a lot of safepoints. Works with " \
570 "GuaranteedSafepointInterval") \
571 \
572 product_pd(bool, BackgroundCompilation, \
573 "A thread requesting compilation is not blocked during " \
574 "compilation") \
575 \
576 product(bool, PrintVMQWaitTime, false, \
577 "Prints out the waiting time in VM operation queue") \
578 \
579 develop(bool, NoYieldsInMicrolock, false, \
580 "Disable yields in microlock") \
581 \
582 develop(bool, TraceOopMapGeneration, false, \
583 "Shows oopmap generation") \
584 \
585 product(bool, MethodFlushing, true, \
586 "Reclamation of zombie and not-entrant methods") \
587 \
588 develop(bool, VerifyStack, false, \
589 "Verify stack of each thread when it is entering a runtime call") \
590 \
591 diagnostic(bool, ForceUnreachable, false, \
592 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
593 \
594 notproduct(bool, StressDerivedPointers, false, \
595 "Force scavenge when a derived pointers is detected on stack " \
596 "after rtm call") \
597 \
598 develop(bool, TraceDerivedPointers, false, \
599 "Trace traversal of derived pointers on stack") \
600 \
601 notproduct(bool, TraceCodeBlobStacks, false, \
602 "Trace stack-walk of codeblobs") \
603 \
604 product(bool, PrintJNIResolving, false, \
605 "Used to implement -v:jni") \
606 \
607 notproduct(bool, PrintRewrites, false, \
608 "Print methods that are being rewritten") \
609 \
610 product(bool, UseInlineCaches, true, \
611 "Use Inline Caches for virtual calls ") \
612 \
613 develop(bool, InlineArrayCopy, true, \
614 "inline arraycopy native that is known to be part of " \
615 "base library DLL") \
616 \
617 develop(bool, InlineObjectHash, true, \
618 "inline Object::hashCode() native that is known to be part " \
619 "of base library DLL") \
620 \
621 develop(bool, InlineNatives, true, \
622 "inline natives that are known to be part of base library DLL") \
623 \
624 develop(bool, InlineMathNatives, true, \
625 "inline SinD, CosD, etc.") \
626 \
627 develop(bool, InlineClassNatives, true, \
628 "inline Class.isInstance, etc") \
629 \
630 develop(bool, InlineThreadNatives, true, \
631 "inline Thread.currentThread, etc") \
632 \
633 develop(bool, InlineUnsafeOps, true, \
634 "inline memory ops (native methods) from sun.misc.Unsafe") \
635 \
636 product(bool, CriticalJNINatives, true, \
637 "check for critical JNI entry points") \
638 \
639 notproduct(bool, StressCriticalJNINatives, false, \
640 "Exercise register saving code in critical natives") \
641 \
642 product(bool, UseSSE42Intrinsics, false, \
643 "SSE4.2 versions of intrinsics") \
644 \
645 product(bool, UseAESIntrinsics, false, \
646 "use intrinsics for AES versions of crypto") \
647 \
648 product(bool, UseCRC32Intrinsics, false, \
649 "use intrinsics for java.util.zip.CRC32") \
650 \
651 develop(bool, TraceCallFixup, false, \
652 "traces all call fixups") \
653 \
654 develop(bool, DeoptimizeALot, false, \
655 "deoptimize at every exit from the runtime system") \
656 \
657 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
658 "a comma separated list of bcis to deoptimize at") \
659 \
660 product(bool, DeoptimizeRandom, false, \
661 "deoptimize random frames on random exit from the runtime system")\
662 \
663 notproduct(bool, ZombieALot, false, \
664 "creates zombies (non-entrant) at exit from the runt. system") \
665 \
666 product(bool, UnlinkSymbolsALot, false, \
667 "unlink unreferenced symbols from the symbol table at safepoints")\
668 \
669 notproduct(bool, WalkStackALot, false, \
670 "trace stack (no print) at every exit from the runtime system") \
671 \
672 product(bool, Debugging, false, \
673 "set when executing debug methods in debug.ccp " \
674 "(to prevent triggering assertions)") \
675 \
676 notproduct(bool, StrictSafepointChecks, trueInDebug, \
677 "Enable strict checks that safepoints cannot happen for threads " \
678 "that used No_Safepoint_Verifier") \
679 \
680 notproduct(bool, VerifyLastFrame, false, \
681 "Verify oops on last frame on entry to VM") \
682 \
683 develop(bool, TraceHandleAllocation, false, \
684 "Prints out warnings when suspicious many handles are allocated") \
685 \
686 product(bool, UseCompilerSafepoints, true, \
687 "Stop at safepoints in compiled code") \
688 \
689 product(bool, FailOverToOldVerifier, true, \
690 "fail over to old verifier when split verifier fails") \
691 \
692 develop(bool, ShowSafepointMsgs, false, \
693 "Show msg. about safepoint synch.") \
694 \
695 product(bool, SafepointTimeout, false, \
696 "Time out and warn or fail after SafepointTimeoutDelay " \
697 "milliseconds if failed to reach safepoint") \
698 \
699 develop(bool, DieOnSafepointTimeout, false, \
700 "Die upon failure to reach safepoint (see SafepointTimeout)") \
701 \
702 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
703 /* typically, at most a few retries are needed */ \
704 product(intx, SuspendRetryCount, 50, \
705 "Maximum retry count for an external suspend request") \
706 \
707 product(intx, SuspendRetryDelay, 5, \
708 "Milliseconds to delay per retry (* current_retry_count)") \
709 \
710 product(bool, AssertOnSuspendWaitFailure, false, \
711 "Assert/Guarantee on external suspend wait failure") \
712 \
713 product(bool, TraceSuspendWaitFailures, false, \
714 "Trace external suspend wait failures") \
715 \
716 product(bool, MaxFDLimit, true, \
717 "Bump the number of file descriptors to max in solaris.") \
718 \
719 diagnostic(bool, LogEvents, true, \
720 "Enable the various ring buffer event logs") \
721 \
722 diagnostic(uintx, LogEventsBufferEntries, 10, \
723 "Enable the various ring buffer event logs") \
724 \
725 product(bool, BytecodeVerificationRemote, true, \
726 "Enables the Java bytecode verifier for remote classes") \
727 \
728 product(bool, BytecodeVerificationLocal, false, \
729 "Enables the Java bytecode verifier for local classes") \
730 \
731 develop(bool, ForceFloatExceptions, trueInDebug, \
732 "Force exceptions on FP stack under/overflow") \
733 \
734 develop(bool, VerifyStackAtCalls, false, \
735 "Verify that the stack pointer is unchanged after calls") \
736 \
737 develop(bool, TraceJavaAssertions, false, \
738 "Trace java language assertions") \
739 \
740 notproduct(bool, CheckAssertionStatusDirectives, false, \
741 "temporary - see javaClasses.cpp") \
742 \
743 notproduct(bool, PrintMallocFree, false, \
744 "Trace calls to C heap malloc/free allocation") \
745 \
746 product(bool, PrintOopAddress, false, \
747 "Always print the location of the oop") \
748 \
749 notproduct(bool, VerifyCodeCacheOften, false, \
750 "Verify compiled-code cache often") \
751 \
752 develop(bool, ZapDeadCompiledLocals, false, \
753 "Zap dead locals in compiler frames") \
754 \
755 notproduct(bool, ZapDeadLocalsOld, false, \
756 "Zap dead locals (old version, zaps all frames when " \
757 "entering the VM") \
758 \
759 notproduct(bool, CheckOopishValues, false, \
760 "Warn if value contains oop ( requires ZapDeadLocals)") \
761 \
762 develop(bool, UseMallocOnly, false, \
763 "use only malloc/free for allocation (no resource area/arena)") \
764 \
765 develop(bool, PrintMalloc, false, \
766 "print all malloc/free calls") \
767 \
768 develop(bool, PrintMallocStatistics, false, \
769 "print malloc/free statistics") \
770 \
771 develop(bool, ZapResourceArea, trueInDebug, \
772 "Zap freed resource/arena space with 0xABABABAB") \
773 \
774 notproduct(bool, ZapVMHandleArea, trueInDebug, \
775 "Zap freed VM handle space with 0xBCBCBCBC") \
776 \
777 develop(bool, ZapJNIHandleArea, trueInDebug, \
778 "Zap freed JNI handle space with 0xFEFEFEFE") \
779 \
780 notproduct(bool, ZapStackSegments, trueInDebug, \
781 "Zap allocated/freed Stack segments with 0xFADFADED") \
782 \
783 develop(bool, ZapUnusedHeapArea, trueInDebug, \
784 "Zap unused heap space with 0xBAADBABE") \
785 \
786 develop(bool, TraceZapUnusedHeapArea, false, \
787 "Trace zapping of unused heap space") \
788 \
789 develop(bool, CheckZapUnusedHeapArea, false, \
790 "Check zapping of unused heap space") \
791 \
792 develop(bool, ZapFillerObjects, trueInDebug, \
793 "Zap filler objects with 0xDEAFBABE") \
794 \
795 develop(bool, PrintVMMessages, true, \
796 "Print vm messages on console") \
797 \
798 product(bool, PrintGCApplicationConcurrentTime, false, \
799 "Print the time the application has been running") \
800 \
801 product(bool, PrintGCApplicationStoppedTime, false, \
802 "Print the time the application has been stopped") \
803 \
804 diagnostic(bool, VerboseVerification, false, \
805 "Display detailed verification details") \
806 \
807 notproduct(uintx, ErrorHandlerTest, 0, \
808 "If > 0, provokes an error after VM initialization; the value" \
809 "determines which error to provoke. See test_error_handler()" \
810 "in debug.cpp.") \
811 \
812 develop(bool, Verbose, false, \
813 "Prints additional debugging information from other modes") \
814 \
815 develop(bool, PrintMiscellaneous, false, \
816 "Prints uncategorized debugging information (requires +Verbose)") \
817 \
818 develop(bool, WizardMode, false, \
819 "Prints much more debugging information") \
820 \
821 product(bool, ShowMessageBoxOnError, false, \
822 "Keep process alive on VM fatal error") \
823 \
824 product(bool, CreateMinidumpOnCrash, false, \
825 "Create minidump on VM fatal error") \
826 \
827 product_pd(bool, UseOSErrorReporting, \
828 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
829 \
830 product(bool, SuppressFatalErrorMessage, false, \
831 "Do NO Fatal Error report [Avoid deadlock]") \
832 \
833 product(ccstrlist, OnError, "", \
834 "Run user-defined commands on fatal error; see VMError.cpp " \
835 "for examples") \
836 \
837 product(ccstrlist, OnOutOfMemoryError, "", \
838 "Run user-defined commands on first java.lang.OutOfMemoryError") \
839 \
840 manageable(bool, HeapDumpBeforeFullGC, false, \
841 "Dump heap to file before any major stop-world GC") \
842 \
843 manageable(bool, HeapDumpAfterFullGC, false, \
844 "Dump heap to file after any major stop-world GC") \
845 \
846 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
847 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
848 \
849 manageable(ccstr, HeapDumpPath, NULL, \
850 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
851 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
852 "in the working directory)") \
853 \
854 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
855 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
856 "when the heap usage is larger than this") \
857 \
858 develop(uintx, HeapDumpSegmentSize, 1*G, \
859 "Approximate segment size when generating a segmented heap dump") \
860 \
861 develop(bool, BreakAtWarning, false, \
862 "Execute breakpoint upon encountering VM warning") \
863 \
864 develop(bool, TraceVMOperation, false, \
865 "Trace vm operations") \
866 \
867 develop(bool, UseFakeTimers, false, \
868 "Tells whether the VM should use system time or a fake timer") \
869 \
870 product(ccstr, NativeMemoryTracking, "off", \
871 "Native memory tracking options") \
872 \
873 diagnostic(bool, PrintNMTStatistics, false, \
874 "Print native memory tracking summary data if it is on") \
875 \
876 diagnostic(bool, AutoShutdownNMT, true, \
877 "Automatically shutdown native memory tracking under stress " \
878 "situation. When set to false, native memory tracking tries to " \
879 "stay alive at the expense of JVM performance") \
880 \
881 diagnostic(bool, LogCompilation, false, \
882 "Log compilation activity in detail to hotspot.log or LogFile") \
883 \
884 product(bool, PrintCompilation, false, \
885 "Print compilations") \
886 \
887 diagnostic(bool, TraceNMethodInstalls, false, \
888 "Trace nmethod intallation") \
889 \
890 diagnostic(intx, ScavengeRootsInCode, 2, \
891 "0: do not allow scavengable oops in the code cache; " \
892 "1: allow scavenging from the code cache; " \
893 "2: emit as many constants as the compiler can see") \
894 \
895 product(bool, AlwaysRestoreFPU, false, \
896 "Restore the FPU control word after every JNI call (expensive)") \
897 \
898 diagnostic(bool, PrintCompilation2, false, \
899 "Print additional statistics per compilation") \
900 \
901 diagnostic(bool, PrintAdapterHandlers, false, \
902 "Print code generated for i2c/c2i adapters") \
903 \
904 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
905 "Verify that i2c/c2i adapters are called properly") \
906 \
907 develop(bool, VerifyAdapterSharing, false, \
908 "Verify that the code for shared adapters is the equivalent") \
909 \
910 diagnostic(bool, PrintAssembly, false, \
911 "Print assembly code (using external disassembler.so)") \
912 \
913 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
914 "Options string passed to disassembler.so") \
915 \
916 diagnostic(bool, PrintNMethods, false, \
917 "Print assembly code for nmethods when generated") \
918 \
919 diagnostic(bool, PrintNativeNMethods, false, \
920 "Print assembly code for native nmethods when generated") \
921 \
922 develop(bool, PrintDebugInfo, false, \
923 "Print debug information for all nmethods when generated") \
924 \
925 develop(bool, PrintRelocations, false, \
926 "Print relocation information for all nmethods when generated") \
927 \
928 develop(bool, PrintDependencies, false, \
929 "Print dependency information for all nmethods when generated") \
930 \
931 develop(bool, PrintExceptionHandlers, false, \
932 "Print exception handler tables for all nmethods when generated") \
933 \
934 develop(bool, StressCompiledExceptionHandlers, false, \
935 "Exercise compiled exception handlers") \
936 \
937 develop(bool, InterceptOSException, false, \
938 "Starts debugger when an implicit OS (e.g., NULL) " \
939 "exception happens") \
940 \
941 product(bool, PrintCodeCache, false, \
942 "Print the code cache memory usage when exiting") \
943 \
944 develop(bool, PrintCodeCache2, false, \
945 "Print detailed usage info on the code cache when exiting") \
946 \
947 product(bool, PrintCodeCacheOnCompilation, false, \
948 "Print the code cache memory usage each time a method is compiled") \
949 \
950 diagnostic(bool, PrintStubCode, false, \
951 "Print generated stub code") \
952 \
953 product(bool, StackTraceInThrowable, true, \
954 "Collect backtrace in throwable when exception happens") \
955 \
956 product(bool, OmitStackTraceInFastThrow, true, \
957 "Omit backtraces for some 'hot' exceptions in optimized code") \
958 \
959 product(bool, ProfilerPrintByteCodeStatistics, false, \
960 "Prints byte code statictics when dumping profiler output") \
961 \
962 product(bool, ProfilerRecordPC, false, \
963 "Collects tick for each 16 byte interval of compiled code") \
964 \
965 product(bool, ProfileVM, false, \
966 "Profiles ticks that fall within VM (either in the VM Thread " \
967 "or VM code called through stubs)") \
968 \
969 product(bool, ProfileIntervals, false, \
970 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
971 \
972 notproduct(bool, ProfilerCheckIntervals, false, \
973 "Collect and print info on spacing of profiler ticks") \
974 \
975 develop(bool, PrintJVMWarnings, false, \
976 "Prints warnings for unimplemented JVM functions") \
977 \
978 product(bool, PrintWarnings, true, \
979 "Prints JVM warnings to output stream") \
980 \
981 notproduct(uintx, WarnOnStalledSpinLock, 0, \
982 "Prints warnings for stalled SpinLocks") \
983 \
984 product(bool, RegisterFinalizersAtInit, true, \
985 "Register finalizable objects at end of Object.<init> or " \
986 "after allocation") \
987 \
988 develop(bool, RegisterReferences, true, \
989 "Tells whether the VM should register soft/weak/final/phantom " \
990 "references") \
991 \
992 develop(bool, IgnoreRewrites, false, \
993 "Supress rewrites of bytecodes in the oopmap generator. " \
994 "This is unsafe!") \
995 \
996 develop(bool, PrintCodeCacheExtension, false, \
997 "Print extension of code cache") \
998 \
999 develop(bool, UsePrivilegedStack, true, \
1000 "Enable the security JVM functions") \
1001 \
1002 develop(bool, ProtectionDomainVerification, true, \
1003 "Verifies protection domain before resolution in system " \
1004 "dictionary") \
1005 \
1006 product(bool, ClassUnloading, true, \
1007 "Do unloading of classes") \
1008 \
1009 develop(bool, DisableStartThread, false, \
1010 "Disable starting of additional Java threads " \
1011 "(for debugging only)") \
1012 \
1013 develop(bool, MemProfiling, false, \
1014 "Write memory usage profiling to log file") \
1015 \
1016 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1017 "Prints the system dictionary at exit") \
1018 \
1019 experimental(intx, PredictedLoadedClassCount, 0, \
1020 "Experimental: Tune loaded class cache starting size.") \
1021 \
1022 diagnostic(bool, UnsyncloadClass, false, \
1023 "Unstable: VM calls loadClass unsynchronized. Custom " \
1024 "class loader must call VM synchronized for findClass " \
1025 "and defineClass.") \
1026 \
1027 product(bool, AlwaysLockClassLoader, false, \
1028 "Require the VM to acquire the class loader lock before calling " \
1029 "loadClass() even for class loaders registering " \
1030 "as parallel capable") \
1031 \
1032 product(bool, AllowParallelDefineClass, false, \
1033 "Allow parallel defineClass requests for class loaders " \
1034 "registering as parallel capable") \
1035 \
1036 product(bool, MustCallLoadClassInternal, false, \
1037 "Call loadClassInternal() rather than loadClass()") \
1038 \
1039 product_pd(bool, DontYieldALot, \
1040 "Throw away obvious excess yield calls (for SOLARIS only)") \
1041 \
1042 product_pd(bool, ConvertSleepToYield, \
1043 "Converts sleep(0) to thread yield " \
1044 "(may be off for SOLARIS to improve GUI)") \
1045 \
1046 product(bool, ConvertYieldToSleep, false, \
1047 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1048 "behavior (SOLARIS only)") \
1049 \
1050 product(bool, UseBoundThreads, true, \
1051 "Bind user level threads to kernel threads (for SOLARIS only)") \
1052 \
1053 develop(bool, UseDetachedThreads, true, \
1054 "Use detached threads that are recycled upon termination " \
1055 "(for SOLARIS only)") \
1056 \
1057 product(bool, UseLWPSynchronization, true, \
1058 "Use LWP-based instead of libthread-based synchronization " \
1059 "(SPARC only)") \
1060 \
1061 product(ccstr, SyncKnobs, NULL, \
1062 "(Unstable) Various monitor synchronization tunables") \
1063 \
1064 product(intx, EmitSync, 0, \
1065 "(Unsafe,Unstable) " \
1066 " Controls emission of inline sync fast-path code") \
1067 \
1068 product(intx, MonitorBound, 0, "Bound Monitor population") \
1069 \
1070 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1071 \
1072 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1073 \
1074 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1075 \
1076 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1077 \
1078 product(intx, hashCode, 5, \
1079 "(Unstable) select hashCode generation algorithm" ) \
1080 \
1081 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1082 "(Unstable, Linux-specific)" \
1083 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1084 \
1085 product(bool, FilterSpuriousWakeups, true, \
1086 "Prevent spurious or premature wakeups from object.wait " \
1087 "(Solaris only)") \
1088 \
1089 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1090 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1091 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1092 \
1093 develop(bool, UsePthreads, false, \
1094 "Use pthread-based instead of libthread-based synchronization " \
1095 "(SPARC only)") \
1096 \
1097 product(bool, AdjustConcurrency, false, \
1098 "call thr_setconcurrency at thread create time to avoid " \
1099 "LWP starvation on MP systems (For Solaris Only)") \
1100 \
1101 product(bool, ReduceSignalUsage, false, \
1102 "Reduce the use of OS signals in Java and/or the VM") \
1103 \
1104 develop_pd(bool, ShareVtableStubs, \
1105 "Share vtable stubs (smaller code but worse branch prediction") \
1106 \
1107 develop(bool, LoadLineNumberTables, true, \
1108 "Tells whether the class file parser loads line number tables") \
1109 \
1110 develop(bool, LoadLocalVariableTables, true, \
1111 "Tells whether the class file parser loads local variable tables")\
1112 \
1113 develop(bool, LoadLocalVariableTypeTables, true, \
1114 "Tells whether the class file parser loads local variable type tables")\
1115 \
1116 product(bool, AllowUserSignalHandlers, false, \
1117 "Do not complain if the application installs signal handlers " \
1118 "(Solaris & Linux only)") \
1119 \
1120 product(bool, UseSignalChaining, true, \
1121 "Use signal-chaining to invoke signal handlers installed " \
1122 "by the application (Solaris & Linux only)") \
1123 \
1124 product(bool, UseAltSigs, false, \
1125 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1126 "internal signals (Solaris only)") \
1127 \
1128 product(bool, AllowJNIEnvProxy, false, \
1129 "Allow JNIEnv proxies for jdbx") \
1130 \
1131 product(bool, JNIDetachReleasesMonitors, true, \
1132 "JNI DetachCurrentThread releases monitors owned by thread") \
1133 \
1134 product(bool, RestoreMXCSROnJNICalls, false, \
1135 "Restore MXCSR when returning from JNI calls") \
1136 \
1137 product(bool, CheckJNICalls, false, \
1138 "Verify all arguments to JNI calls") \
1139 \
1140 product(bool, UseFastJNIAccessors, true, \
1141 "Use optimized versions of Get<Primitive>Field") \
1142 \
1143 product(bool, EagerXrunInit, false, \
1144 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1145 " but not all -Xrun libraries may support the state of the VM at this time") \
1146 \
1147 product(bool, PreserveAllAnnotations, false, \
1148 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1149 \
1150 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1151 "Number of OutOfMemoryErrors preallocated with backtrace") \
1152 \
1153 product(bool, LazyBootClassLoader, true, \
1154 "Enable/disable lazy opening of boot class path entries") \
1155 \
1156 product(bool, UseXMMForArrayCopy, false, \
1157 "Use SSE2 MOVQ instruction for Arraycopy") \
1158 \
1159 product(intx, FieldsAllocationStyle, 1, \
1160 "0 - type based with oops first, 1 - with oops last, " \
1161 "2 - oops in super and sub classes are together") \
1162 \
1163 product(bool, CompactFields, true, \
1164 "Allocate nonstatic fields in gaps between previous fields") \
1165 \
1166 notproduct(bool, PrintFieldLayout, false, \
1167 "Print field layout for each class") \
1168 \
1169 product(intx, ContendedPaddingWidth, 128, \
1170 "How many bytes to pad the fields/classes marked @Contended with")\
1171 \
1172 product(bool, EnableContended, true, \
1173 "Enable @Contended annotation support") \
1174 \
1175 product(bool, RestrictContended, true, \
1176 "Restrict @Contended to trusted classes") \
1177 \
1178 product(bool, UseBiasedLocking, true, \
1179 "Enable biased locking in JVM") \
1180 \
1181 product(intx, BiasedLockingStartupDelay, 4000, \
1182 "Number of milliseconds to wait before enabling biased locking") \
1183 \
1184 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1185 "Print statistics of biased locking in JVM") \
1186 \
1187 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1188 "Threshold of number of revocations per type to try to " \
1189 "rebias all objects in the heap of that type") \
1190 \
1191 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1192 "Threshold of number of revocations per type to permanently " \
1193 "revoke biases of all objects in the heap of that type") \
1194 \
1195 product(intx, BiasedLockingDecayTime, 25000, \
1196 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1197 "type after previous bulk rebias") \
1198 \
1199 /* tracing */ \
1200 \
1201 notproduct(bool, TraceRuntimeCalls, false, \
1202 "Trace run-time calls") \
1203 \
1204 develop(bool, TraceJNICalls, false, \
1205 "Trace JNI calls") \
1206 \
1207 notproduct(bool, TraceJVMCalls, false, \
1208 "Trace JVM calls") \
1209 \
1210 product(ccstr, TraceJVMTI, NULL, \
1211 "Trace flags for JVMTI functions and events") \
1212 \
1213 /* This option can change an EMCP method into an obsolete method. */ \
1214 /* This can affect tests that except specific methods to be EMCP. */ \
1215 /* This option should be used with caution. */ \
1216 product(bool, StressLdcRewrite, false, \
1217 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1218 \
1219 product(intx, TraceRedefineClasses, 0, \
1220 "Trace level for JVMTI RedefineClasses") \
1221 \
1222 develop(bool, StressMethodComparator, false, \
1223 "run the MethodComparator on all loaded methods") \
1224 \
1225 /* change to false by default sometime after Mustang */ \
1226 product(bool, VerifyMergedCPBytecodes, true, \
1227 "Verify bytecodes after RedefineClasses constant pool merging") \
1228 \
1229 develop(bool, TraceJNIHandleAllocation, false, \
1230 "Trace allocation/deallocation of JNI handle blocks") \
1231 \
1232 develop(bool, TraceThreadEvents, false, \
1233 "Trace all thread events") \
1234 \
1235 develop(bool, TraceBytecodes, false, \
1236 "Trace bytecode execution") \
1237 \
1238 develop(bool, TraceClassInitialization, false, \
1239 "Trace class initialization") \
1240 \
1241 develop(bool, TraceExceptions, false, \
1242 "Trace exceptions") \
1243 \
1244 develop(bool, TraceICs, false, \
1245 "Trace inline cache changes") \
1246 \
1247 notproduct(bool, TraceInvocationCounterOverflow, false, \
1248 "Trace method invocation counter overflow") \
1249 \
1250 develop(bool, TraceInlineCacheClearing, false, \
1251 "Trace clearing of inline caches in nmethods") \
1252 \
1253 develop(bool, TraceDependencies, false, \
1254 "Trace dependencies") \
1255 \
1256 develop(bool, VerifyDependencies, trueInDebug, \
1257 "Exercise and verify the compilation dependency mechanism") \
1258 \
1259 develop(bool, TraceNewOopMapGeneration, false, \
1260 "Trace OopMapGeneration") \
1261 \
1262 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1263 "Trace OopMapGeneration: print detailed cell states") \
1264 \
1265 develop(bool, TimeOopMap, false, \
1266 "Time calls to GenerateOopMap::compute_map() in sum") \
1267 \
1268 develop(bool, TimeOopMap2, false, \
1269 "Time calls to GenerateOopMap::compute_map() individually") \
1270 \
1271 develop(bool, TraceMonitorMismatch, false, \
1272 "Trace monitor matching failures during OopMapGeneration") \
1273 \
1274 develop(bool, TraceOopMapRewrites, false, \
1275 "Trace rewritting of method oops during oop map generation") \
1276 \
1277 develop(bool, TraceSafepoint, false, \
1278 "Trace safepoint operations") \
1279 \
1280 develop(bool, TraceICBuffer, false, \
1281 "Trace usage of IC buffer") \
1282 \
1283 develop(bool, TraceCompiledIC, false, \
1284 "Trace changes of compiled IC") \
1285 \
1286 notproduct(bool, TraceZapDeadLocals, false, \
1287 "Trace zapping dead locals") \
1288 \
1289 develop(bool, TraceStartupTime, false, \
1290 "Trace setup time") \
1291 \
1292 develop(bool, TraceProtectionDomainVerification, false, \
1293 "Trace protection domain verifcation") \
1294 \
1295 develop(bool, TraceClearedExceptions, false, \
1296 "Prints when an exception is forcibly cleared") \
1297 \
1298 product(bool, TraceClassResolution, false, \
1299 "Trace all constant pool resolutions (for debugging)") \
1300 \
1301 product(bool, TraceBiasedLocking, false, \
1302 "Trace biased locking in JVM") \
1303 \
1304 product(bool, TraceMonitorInflation, false, \
1305 "Trace monitor inflation in JVM") \
1306 \
1307 /* gc */ \
1308 \
1309 product(bool, UseSerialGC, false, \
1310 "Use the serial garbage collector") \
1311 \
1312 product(bool, UseG1GC, false, \
1313 "Use the Garbage-First garbage collector") \
1314 \
1315 product(bool, UseParallelGC, false, \
1316 "Use the Parallel Scavenge garbage collector") \
1317 \
1318 product(bool, UseParallelOldGC, false, \
1319 "Use the Parallel Old garbage collector") \
1320 \
1321 product(uintx, HeapMaximumCompactionInterval, 20, \
1322 "How often should we maximally compact the heap (not allowing " \
1323 "any dead space)") \
1324 \
1325 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1326 "The collection count for the first maximum compaction") \
1327 \
1328 product(bool, UseMaximumCompactionOnSystemGC, true, \
1329 "In the Parallel Old garbage collector maximum compaction for " \
1330 "a system GC") \
1331 \
1332 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1333 "The mean used by the par compact dead wood" \
1334 "limiter (a number between 0-100).") \
1335 \
1336 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1337 "The standard deviation used by the par compact dead wood" \
1338 "limiter (a number between 0-100).") \
1339 \
1340 product(uintx, ParallelGCThreads, 0, \
1341 "Number of parallel threads parallel gc will use") \
1342 \
1343 product(bool, UseDynamicNumberOfGCThreads, false, \
1344 "Dynamically choose the number of parallel threads " \
1345 "parallel gc will use") \
1346 \
1347 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1348 "Force dynamic selection of the number of" \
1349 "parallel threads parallel gc will use to aid debugging") \
1350 \
1351 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1352 "Size of heap (bytes) per GC thread used in calculating the " \
1353 "number of GC threads") \
1354 \
1355 product(bool, TraceDynamicGCThreads, false, \
1356 "Trace the dynamic GC thread usage") \
1357 \
1358 develop(bool, ParallelOldGCSplitALot, false, \
1359 "Provoke splitting (copying data from a young gen space to" \
1360 "multiple destination spaces)") \
1361 \
1362 develop(uintx, ParallelOldGCSplitInterval, 3, \
1363 "How often to provoke splitting a young gen space") \
1364 \
1365 product(uintx, ConcGCThreads, 0, \
1366 "Number of threads concurrent gc will use") \
1367 \
1368 product(uintx, YoungPLABSize, 4096, \
1369 "Size of young gen promotion labs (in HeapWords)") \
1370 \
1371 product(uintx, OldPLABSize, 1024, \
1372 "Size of old gen promotion labs (in HeapWords)") \
1373 \
1374 product(uintx, GCTaskTimeStampEntries, 200, \
1375 "Number of time stamp entries per gc worker thread") \
1376 \
1377 product(bool, AlwaysTenure, false, \
1378 "Always tenure objects in eden. (ParallelGC only)") \
1379 \
1380 product(bool, NeverTenure, false, \
1381 "Never tenure objects in eden, May tenure on overflow " \
1382 "(ParallelGC only)") \
1383 \
1384 product(bool, ScavengeBeforeFullGC, true, \
1385 "Scavenge youngest generation before each full GC, " \
1386 "used with UseParallelGC") \
1387 \
1388 develop(bool, ScavengeWithObjectsInToSpace, false, \
1389 "Allow scavenges to occur when to_space contains objects.") \
1390 \
1391 product(bool, UseConcMarkSweepGC, false, \
1392 "Use Concurrent Mark-Sweep GC in the old generation") \
1393 \
1394 product(bool, ExplicitGCInvokesConcurrent, false, \
1395 "A System.gc() request invokes a concurrent collection;" \
1396 " (effective only when UseConcMarkSweepGC)") \
1397 \
1398 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1399 "A System.gc() request invokes a concurrent collection and " \
1400 "also unloads classes during such a concurrent gc cycle " \
1401 "(effective only when UseConcMarkSweepGC)") \
1402 \
1403 product(bool, GCLockerInvokesConcurrent, false, \
1404 "The exit of a JNI CS necessitating a scavenge also" \
1405 " kicks off a bkgrd concurrent collection") \
1406 \
1407 product(uintx, GCLockerEdenExpansionPercent, 5, \
1408 "How much the GC can expand the eden by while the GC locker " \
1409 "is active (as a percentage)") \
1410 \
1411 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1412 "Number of times to retry allocations when" \
1413 " blocked by the GC locker") \
1414 \
1415 develop(bool, UseCMSAdaptiveFreeLists, true, \
1416 "Use Adaptive Free Lists in the CMS generation") \
1417 \
1418 develop(bool, UseAsyncConcMarkSweepGC, true, \
1419 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1420 \
1421 develop(bool, RotateCMSCollectionTypes, false, \
1422 "Rotate the CMS collections among concurrent and STW") \
1423 \
1424 product(bool, UseCMSBestFit, true, \
1425 "Use CMS best fit allocation strategy") \
1426 \
1427 product(bool, UseCMSCollectionPassing, true, \
1428 "Use passing of collection from background to foreground") \
1429 \
1430 product(bool, UseParNewGC, false, \
1431 "Use parallel threads in the new generation.") \
1432 \
1433 product(bool, ParallelGCVerbose, false, \
1434 "Verbose output for parallel GC.") \
1435 \
1436 product(uintx, ParallelGCBufferWastePct, 10, \
1437 "Wasted fraction of parallel allocation buffer.") \
1438 \
1439 diagnostic(bool, ParallelGCRetainPLAB, false, \
1440 "Retain parallel allocation buffers across scavenges; " \
1441 " -- disabled because this currently conflicts with " \
1442 " parallel card scanning under certain conditions ") \
1443 \
1444 product(uintx, TargetPLABWastePct, 10, \
1445 "Target wasted space in last buffer as percent of overall " \
1446 "allocation") \
1447 \
1448 product(uintx, PLABWeight, 75, \
1449 "Percentage (0-100) used to weight the current sample when" \
1450 "computing exponentially decaying average for ResizePLAB.") \
1451 \
1452 product(bool, ResizePLAB, true, \
1453 "Dynamically resize (survivor space) promotion labs") \
1454 \
1455 product(bool, PrintPLAB, false, \
1456 "Print (survivor space) promotion labs sizing decisions") \
1457 \
1458 product(intx, ParGCArrayScanChunk, 50, \
1459 "Scan a subset and push remainder, if array is bigger than this") \
1460 \
1461 product(bool, ParGCUseLocalOverflow, false, \
1462 "Instead of a global overflow list, use local overflow stacks") \
1463 \
1464 product(bool, ParGCTrimOverflow, true, \
1465 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1466 \
1467 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1468 "Whether we should simulate work queue overflow in ParNew") \
1469 \
1470 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1471 "An `interval' counter that determines how frequently " \
1472 "we simulate overflow; a smaller number increases frequency") \
1473 \
1474 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1475 "The desired number of objects to claim from the overflow list") \
1476 \
1477 diagnostic(uintx, ParGCStridesPerThread, 2, \
1478 "The number of strides per worker thread that we divide up the " \
1479 "card table scanning work into") \
1480 \
1481 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1482 "The number of cards in each chunk of the parallel chunks used " \
1483 "during card table scanning") \
1484 \
1485 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1486 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1487 "parallel GC.") \
1488 \
1489 product(uintx, OldPLABWeight, 50, \
1490 "Percentage (0-100) used to weight the current sample when" \
1491 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1492 \
1493 product(bool, ResizeOldPLAB, true, \
1494 "Dynamically resize (old gen) promotion labs") \
1495 \
1496 product(bool, PrintOldPLAB, false, \
1497 "Print (old gen) promotion labs sizing decisions") \
1498 \
1499 product(uintx, CMSOldPLABMin, 16, \
1500 "Min size of CMS gen promotion lab caches per worker per blksize")\
1501 \
1502 product(uintx, CMSOldPLABMax, 1024, \
1503 "Max size of CMS gen promotion lab caches per worker per blksize")\
1504 \
1505 product(uintx, CMSOldPLABNumRefills, 4, \
1506 "Nominal number of refills of CMS gen promotion lab cache" \
1507 " per worker per block size") \
1508 \
1509 product(bool, CMSOldPLABResizeQuicker, false, \
1510 "Whether to react on-the-fly during a scavenge to a sudden" \
1511 " change in block demand rate") \
1512 \
1513 product(uintx, CMSOldPLABToleranceFactor, 4, \
1514 "The tolerance of the phase-change detector for on-the-fly" \
1515 " PLAB resizing during a scavenge") \
1516 \
1517 product(uintx, CMSOldPLABReactivityFactor, 2, \
1518 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1519 " during a scavenge") \
1520 \
1521 product(bool, AlwaysPreTouch, false, \
1522 "It forces all freshly committed pages to be pre-touched.") \
1523 \
1524 product_pd(uintx, CMSYoungGenPerWorker, \
1525 "The maximum size of young gen chosen by default per GC worker " \
1526 "thread available") \
1527 \
1528 product(bool, CMSIncrementalMode, false, \
1529 "Whether CMS GC should operate in \"incremental\" mode") \
1530 \
1531 product(uintx, CMSIncrementalDutyCycle, 10, \
1532 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1533 "CMSIncrementalPacing is enabled, then this is just the initial" \
1534 "value") \
1535 \
1536 product(bool, CMSIncrementalPacing, true, \
1537 "Whether the CMS incremental mode duty cycle should be " \
1538 "automatically adjusted") \
1539 \
1540 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1541 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1542 "enabled (a percentage, 0-100)") \
1543 \
1544 product(uintx, CMSIncrementalSafetyFactor, 10, \
1545 "Percentage (0-100) used to add conservatism when computing the " \
1546 "duty cycle") \
1547 \
1548 product(uintx, CMSIncrementalOffset, 0, \
1549 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1550 " is shifted to the right within the period between young GCs") \
1551 \
1552 product(uintx, CMSExpAvgFactor, 50, \
1553 "Percentage (0-100) used to weight the current sample when" \
1554 "computing exponential averages for CMS statistics.") \
1555 \
1556 product(uintx, CMS_FLSWeight, 75, \
1557 "Percentage (0-100) used to weight the current sample when" \
1558 "computing exponentially decating averages for CMS FLS statistics.") \
1559 \
1560 product(uintx, CMS_FLSPadding, 1, \
1561 "The multiple of deviation from mean to use for buffering" \
1562 "against volatility in free list demand.") \
1563 \
1564 product(uintx, FLSCoalescePolicy, 2, \
1565 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1566 \
1567 product(bool, FLSAlwaysCoalesceLarge, false, \
1568 "CMS: Larger free blocks are always available for coalescing") \
1569 \
1570 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1571 "CMS: the smaller the percentage the greater the coalition force")\
1572 \
1573 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1574 "CMS: the factor by which to inflate estimated demand of small" \
1575 " block sizes to prevent coalescing with an adjoining block") \
1576 \
1577 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1578 "CMS: the factor by which to inflate estimated demand of large" \
1579 " block sizes to prevent coalescing with an adjoining block") \
1580 \
1581 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1582 "CMS: the factor by which to inflate estimated demand of small" \
1583 " block sizes to prevent splitting to supply demand for smaller" \
1584 " blocks") \
1585 \
1586 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1587 "CMS: the factor by which to inflate estimated demand of large" \
1588 " block sizes to prevent splitting to supply demand for smaller" \
1589 " blocks") \
1590 \
1591 product(bool, CMSExtrapolateSweep, false, \
1592 "CMS: cushion for block demand during sweep") \
1593 \
1594 product(uintx, CMS_SweepWeight, 75, \
1595 "Percentage (0-100) used to weight the current sample when " \
1596 "computing exponentially decaying average for inter-sweep " \
1597 "duration") \
1598 \
1599 product(uintx, CMS_SweepPadding, 1, \
1600 "The multiple of deviation from mean to use for buffering " \
1601 "against volatility in inter-sweep duration.") \
1602 \
1603 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1604 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1605 "duration exceeds this threhold in milliseconds") \
1606 \
1607 develop(bool, CMSTraceIncrementalMode, false, \
1608 "Trace CMS incremental mode") \
1609 \
1610 develop(bool, CMSTraceIncrementalPacing, false, \
1611 "Trace CMS incremental mode pacing computation") \
1612 \
1613 develop(bool, CMSTraceThreadState, false, \
1614 "Trace the CMS thread state (enable the trace_state() method)") \
1615 \
1616 product(bool, CMSClassUnloadingEnabled, true, \
1617 "Whether class unloading enabled when using CMS GC") \
1618 \
1619 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1620 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1621 " for which classes may not be unloaded") \
1622 \
1623 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1624 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1625 \
1626 product(bool, UseCMSCompactAtFullCollection, true, \
1627 "Use mark sweep compact at full collections") \
1628 \
1629 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1630 "Number of CMS full collection done before compaction if > 0") \
1631 \
1632 develop(intx, CMSDictionaryChoice, 0, \
1633 "Use BinaryTreeDictionary as default in the CMS generation") \
1634 \
1635 product(uintx, CMSIndexedFreeListReplenish, 4, \
1636 "Replenish an indexed free list with this number of chunks") \
1637 \
1638 product(bool, CMSReplenishIntermediate, true, \
1639 "Replenish all intermediate free-list caches") \
1640 \
1641 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1642 "When satisfying batched demand, split blocks from the " \
1643 "IndexedFreeList whose size is a multiple of requested size") \
1644 \
1645 product(bool, CMSLoopWarn, false, \
1646 "Warn in case of excessive CMS looping") \
1647 \
1648 develop(bool, CMSOverflowEarlyRestoration, false, \
1649 "Whether preserved marks should be restored early") \
1650 \
1651 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1652 "Size of marking stack") \
1653 \
1654 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1655 "Max size of marking stack") \
1656 \
1657 notproduct(bool, CMSMarkStackOverflowALot, false, \
1658 "Whether we should simulate frequent marking stack / work queue" \
1659 " overflow") \
1660 \
1661 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1662 "An `interval' counter that determines how frequently" \
1663 " we simulate overflow; a smaller number increases frequency") \
1664 \
1665 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1666 "(Temporary, subject to experimentation)" \
1667 "Maximum number of abortable preclean iterations, if > 0") \
1668 \
1669 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1670 "(Temporary, subject to experimentation)" \
1671 "Maximum time in abortable preclean in ms") \
1672 \
1673 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1674 "(Temporary, subject to experimentation)" \
1675 "Nominal minimum work per abortable preclean iteration") \
1676 \
1677 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1678 "(Temporary, subject to experimentation)" \
1679 " Time that we sleep between iterations when not given" \
1680 " enough work per iteration") \
1681 \
1682 product(uintx, CMSRescanMultiple, 32, \
1683 "Size (in cards) of CMS parallel rescan task") \
1684 \
1685 product(uintx, CMSConcMarkMultiple, 32, \
1686 "Size (in cards) of CMS concurrent MT marking task") \
1687 \
1688 product(bool, CMSAbortSemantics, false, \
1689 "Whether abort-on-overflow semantics is implemented") \
1690 \
1691 product(bool, CMSParallelRemarkEnabled, true, \
1692 "Whether parallel remark enabled (only if ParNewGC)") \
1693 \
1694 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1695 "Whether parallel remark of survivor space" \
1696 " enabled (effective only if CMSParallelRemarkEnabled)") \
1697 \
1698 product(bool, CMSPLABRecordAlways, true, \
1699 "Whether to always record survivor space PLAB bdries" \
1700 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1701 \
1702 product(bool, CMSConcurrentMTEnabled, true, \
1703 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1704 \
1705 product(bool, CMSPrecleaningEnabled, true, \
1706 "Whether concurrent precleaning enabled") \
1707 \
1708 product(uintx, CMSPrecleanIter, 3, \
1709 "Maximum number of precleaning iteration passes") \
1710 \
1711 product(uintx, CMSPrecleanNumerator, 2, \
1712 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1713 " ratio") \
1714 \
1715 product(uintx, CMSPrecleanDenominator, 3, \
1716 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1717 " ratio") \
1718 \
1719 product(bool, CMSPrecleanRefLists1, true, \
1720 "Preclean ref lists during (initial) preclean phase") \
1721 \
1722 product(bool, CMSPrecleanRefLists2, false, \
1723 "Preclean ref lists during abortable preclean phase") \
1724 \
1725 product(bool, CMSPrecleanSurvivors1, false, \
1726 "Preclean survivors during (initial) preclean phase") \
1727 \
1728 product(bool, CMSPrecleanSurvivors2, true, \
1729 "Preclean survivors during abortable preclean phase") \
1730 \
1731 product(uintx, CMSPrecleanThreshold, 1000, \
1732 "Don't re-iterate if #dirty cards less than this") \
1733 \
1734 product(bool, CMSCleanOnEnter, true, \
1735 "Clean-on-enter optimization for reducing number of dirty cards") \
1736 \
1737 product(uintx, CMSRemarkVerifyVariant, 1, \
1738 "Choose variant (1,2) of verification following remark") \
1739 \
1740 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1741 "If Eden used is below this value, don't try to schedule remark") \
1742 \
1743 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1744 "The Eden occupancy % at which to try and schedule remark pause") \
1745 \
1746 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1747 "Start sampling Eden top at least before yg occupancy reaches" \
1748 " 1/<ratio> of the size at which we plan to schedule remark") \
1749 \
1750 product(uintx, CMSSamplingGrain, 16*K, \
1751 "The minimum distance between eden samples for CMS (see above)") \
1752 \
1753 product(bool, CMSScavengeBeforeRemark, false, \
1754 "Attempt scavenge before the CMS remark step") \
1755 \
1756 develop(bool, CMSTraceSweeper, false, \
1757 "Trace some actions of the CMS sweeper") \
1758 \
1759 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1760 "Don't drain below this size per parallel worker/thief") \
1761 \
1762 manageable(intx, CMSWaitDuration, 2000, \
1763 "Time in milliseconds that CMS thread waits for young GC") \
1764 \
1765 develop(uintx, CMSCheckInterval, 1000, \
1766 "Interval in milliseconds that CMS thread checks if it " \
1767 "should start a collection cycle") \
1768 \
1769 product(bool, CMSYield, true, \
1770 "Yield between steps of concurrent mark & sweep") \
1771 \
1772 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1773 "Bitmap operations should process at most this many bits" \
1774 "between yields") \
1775 \
1776 product(bool, CMSDumpAtPromotionFailure, false, \
1777 "Dump useful information about the state of the CMS old " \
1778 " generation upon a promotion failure.") \
1779 \
1780 product(bool, CMSPrintChunksInDump, false, \
1781 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1782 " more detailed information about the free chunks.") \
1783 \
1784 product(bool, CMSPrintObjectsInDump, false, \
1785 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1786 " more detailed information about the allocated objects.") \
1787 \
1788 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1789 "Verify that all refs across the FLS boundary " \
1790 " are to valid objects") \
1791 \
1792 diagnostic(bool, FLSVerifyLists, false, \
1793 "Do lots of (expensive) FreeListSpace verification") \
1794 \
1795 diagnostic(bool, FLSVerifyIndexTable, false, \
1796 "Do lots of (expensive) FLS index table verification") \
1797 \
1798 develop(bool, FLSVerifyDictionary, false, \
1799 "Do lots of (expensive) FLS dictionary verification") \
1800 \
1801 develop(bool, VerifyBlockOffsetArray, false, \
1802 "Do (expensive!) block offset array verification") \
1803 \
1804 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1805 "Maintain _unallocated_block in BlockOffsetArray" \
1806 " (currently applicable only to CMS collector)") \
1807 \
1808 develop(bool, TraceCMSState, false, \
1809 "Trace the state of the CMS collection") \
1810 \
1811 product(intx, RefDiscoveryPolicy, 0, \
1812 "Whether reference-based(0) or referent-based(1)") \
1813 \
1814 product(bool, ParallelRefProcEnabled, false, \
1815 "Enable parallel reference processing whenever possible") \
1816 \
1817 product(bool, ParallelRefProcBalancingEnabled, true, \
1818 "Enable balancing of reference processing queues") \
1819 \
1820 product(uintx, CMSTriggerRatio, 80, \
1821 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1822 "allocated before a CMS collection cycle commences") \
1823 \
1824 product(uintx, CMSBootstrapOccupancy, 50, \
1825 "Percentage CMS generation occupancy at which to " \
1826 "initiate CMS collection for bootstrapping collection stats") \
1827 \
1828 product(intx, CMSInitiatingOccupancyFraction, -1, \
1829 "Percentage CMS generation occupancy to start a CMS collection " \
1830 "cycle. A negative value means that CMSTriggerRatio is used") \
1831 \
1832 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1833 "Percentage of the (entire) heap occupancy to start a " \
1834 "concurrent GC cycle. It is used by GCs that trigger a " \
1835 "concurrent GC cycle based on the occupancy of the entire heap, " \
1836 "not just one of the generations (e.g., G1). A value of 0 " \
1837 "denotes 'do constant GC cycles'.") \
1838 \
1839 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1840 "Only use occupancy as a crierion for starting a CMS collection") \
1841 \
1842 product(uintx, CMSIsTooFullPercentage, 98, \
1843 "An absolute ceiling above which CMS will always consider the " \
1844 "unloading of classes when class unloading is enabled") \
1845 \
1846 develop(bool, CMSTestInFreeList, false, \
1847 "Check if the coalesced range is already in the " \
1848 "free lists as claimed") \
1849 \
1850 notproduct(bool, CMSVerifyReturnedBytes, false, \
1851 "Check that all the garbage collected was returned to the " \
1852 "free lists.") \
1853 \
1854 notproduct(bool, ScavengeALot, false, \
1855 "Force scavenge at every Nth exit from the runtime system " \
1856 "(N=ScavengeALotInterval)") \
1857 \
1858 develop(bool, FullGCALot, false, \
1859 "Force full gc at every Nth exit from the runtime system " \
1860 "(N=FullGCALotInterval)") \
1861 \
1862 notproduct(bool, GCALotAtAllSafepoints, false, \
1863 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1864 \
1865 product(bool, PrintPromotionFailure, false, \
1866 "Print additional diagnostic information following " \
1867 " promotion failure") \
1868 \
1869 notproduct(bool, PromotionFailureALot, false, \
1870 "Use promotion failure handling on every youngest generation " \
1871 "collection") \
1872 \
1873 develop(uintx, PromotionFailureALotCount, 1000, \
1874 "Number of promotion failures occurring at ParGCAllocBuffer" \
1875 "refill attempts (ParNew) or promotion attempts " \
1876 "(other young collectors) ") \
1877 \
1878 develop(uintx, PromotionFailureALotInterval, 5, \
1879 "Total collections between promotion failures alot") \
1880 \
1881 experimental(uintx, WorkStealingSleepMillis, 1, \
1882 "Sleep time when sleep is used for yields") \
1883 \
1884 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1885 "Number of yields before a sleep is done during workstealing") \
1886 \
1887 experimental(uintx, WorkStealingHardSpins, 4096, \
1888 "Number of iterations in a spin loop between checks on " \
1889 "time out of hard spin") \
1890 \
1891 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1892 "Ratio of hard spins to calls to yield") \
1893 \
1894 develop(uintx, ObjArrayMarkingStride, 512, \
1895 "Number of ObjArray elements to push onto the marking stack" \
1896 "before pushing a continuation entry") \
1897 \
1898 develop(bool, MetadataAllocationFailALot, false, \
1899 "Fail metadata allocations at intervals controlled by " \
1900 "MetadataAllocationFailALotInterval") \
1901 \
1902 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1903 "metadata allocation failure alot interval") \
1904 \
1905 develop(bool, MetaDataDeallocateALot, false, \
1906 "Deallocation bunches of metadata at intervals controlled by " \
1907 "MetaDataAllocateALotInterval") \
1908 \
1909 develop(uintx, MetaDataDeallocateALotInterval, 100, \
1910 "Metadata deallocation alot interval") \
1911 \
1912 develop(bool, TraceMetadataChunkAllocation, false, \
1913 "Trace chunk metadata allocations") \
1914 \
1915 product(bool, TraceMetadataHumongousAllocation, false, \
1916 "Trace humongous metadata allocations") \
1917 \
1918 develop(bool, TraceMetavirtualspaceAllocation, false, \
1919 "Trace virtual space metadata allocations") \
1920 \
1921 notproduct(bool, ExecuteInternalVMTests, false, \
1922 "Enable execution of internal VM tests.") \
1923 \
1924 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1925 \
1926 product_pd(bool, ResizeTLAB, \
1927 "Dynamically resize tlab size for threads") \
1928 \
1929 product(bool, ZeroTLAB, false, \
1930 "Zero out the newly created TLAB") \
1931 \
1932 product(bool, FastTLABRefill, true, \
1933 "Use fast TLAB refill code") \
1934 \
1935 product(bool, PrintTLAB, false, \
1936 "Print various TLAB related information") \
1937 \
1938 product(bool, TLABStats, true, \
1939 "Print various TLAB related information") \
1940 \
1941 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
1942 "Enable LowMemoryProtection")) \
1943 \
1944 product_pd(bool, NeverActAsServerClassMachine, \
1945 "Never act like a server-class machine") \
1946 \
1947 product(bool, AlwaysActAsServerClassMachine, false, \
1948 "Always act like a server-class machine") \
1949 \
1950 product_pd(uint64_t, MaxRAM, \
1951 "Real memory size (in bytes) used to set maximum heap size") \
1952 \
1953 product(uintx, ErgoHeapSizeLimit, 0, \
1954 "Maximum ergonomically set heap size (in bytes); zero means use " \
1955 "MaxRAM / MaxRAMFraction") \
1956 \
1957 product(uintx, MaxRAMFraction, 4, \
1958 "Maximum fraction (1/n) of real memory used for maximum heap " \
1959 "size") \
1960 \
1961 product(uintx, DefaultMaxRAMFraction, 4, \
1962 "Maximum fraction (1/n) of real memory used for maximum heap " \
1963 "size; deprecated: to be renamed to MaxRAMFraction") \
1964 \
1965 product(uintx, MinRAMFraction, 2, \
1966 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1967 "size on systems with small physical memory size") \
1968 \
1969 product(uintx, InitialRAMFraction, 64, \
1970 "Fraction (1/n) of real memory used for initial heap size") \
1971 \
1972 develop(uintx, MaxVirtMemFraction, 2, \
1973 "Maximum fraction (1/n) of virtual memory used for ergonomically" \
1974 "determining maximum heap size") \
1975 \
1976 product(bool, UseAutoGCSelectPolicy, false, \
1977 "Use automatic collection selection policy") \
1978 \
1979 product(uintx, AutoGCSelectPauseMillis, 5000, \
1980 "Automatic GC selection pause threshhold in ms") \
1981 \
1982 product(bool, UseAdaptiveSizePolicy, true, \
1983 "Use adaptive generation sizing policies") \
1984 \
1985 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
1986 "Use adaptive survivor sizing policies") \
1987 \
1988 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
1989 "Use adaptive young-old sizing policies at minor collections") \
1990 \
1991 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
1992 "Use adaptive young-old sizing policies at major collections") \
1993 \
1994 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
1995 "Use statistics from System.GC for adaptive size policy") \
1996 \
1997 product(bool, UseAdaptiveGCBoundary, false, \
1998 "Allow young-old boundary to move") \
1999 \
2000 develop(bool, TraceAdaptiveGCBoundary, false, \
2001 "Trace young-old boundary moves") \
2002 \
2003 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2004 "Resize the virtual spaces of the young or old generations") \
2005 \
2006 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2007 "Policy for changeing generation size for throughput goals") \
2008 \
2009 product(uintx, AdaptiveSizePausePolicy, 0, \
2010 "Policy for changing generation size for pause goals") \
2011 \
2012 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2013 "Adjust tenured generation to achive a minor pause goal") \
2014 \
2015 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2016 "Adjust young generation to achive a major pause goal") \
2017 \
2018 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2019 "Number of steps where heuristics is used before data is used") \
2020 \
2021 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2022 "Number of collections before the adaptive sizing is started") \
2023 \
2024 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2025 "Collection interval for printing information; zero means never") \
2026 \
2027 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2028 "Use adaptive minimum footprint as a goal") \
2029 \
2030 product(uintx, AdaptiveSizePolicyWeight, 10, \
2031 "Weight given to exponential resizing, between 0 and 100") \
2032 \
2033 product(uintx, AdaptiveTimeWeight, 25, \
2034 "Weight given to time in adaptive policy, between 0 and 100") \
2035 \
2036 product(uintx, PausePadding, 1, \
2037 "How much buffer to keep for pause time") \
2038 \
2039 product(uintx, PromotedPadding, 3, \
2040 "How much buffer to keep for promotion failure") \
2041 \
2042 product(uintx, SurvivorPadding, 3, \
2043 "How much buffer to keep for survivor overflow") \
2044 \
2045 product(uintx, ThresholdTolerance, 10, \
2046 "Allowed collection cost difference between generations") \
2047 \
2048 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2049 "If collection costs are within margin, reduce both by full " \
2050 "delta") \
2051 \
2052 product(uintx, YoungGenerationSizeIncrement, 20, \
2053 "Adaptive size percentage change in young generation") \
2054 \
2055 product(uintx, YoungGenerationSizeSupplement, 80, \
2056 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2057 \
2058 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2059 "Decay factor to YoungedGenerationSizeSupplement") \
2060 \
2061 product(uintx, TenuredGenerationSizeIncrement, 20, \
2062 "Adaptive size percentage change in tenured generation") \
2063 \
2064 product(uintx, TenuredGenerationSizeSupplement, 80, \
2065 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2066 \
2067 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2068 "Decay factor to TenuredGenerationSizeIncrement") \
2069 \
2070 product(uintx, MaxGCPauseMillis, max_uintx, \
2071 "Adaptive size policy maximum GC pause time goal in msec, " \
2072 "or (G1 Only) the max. GC time per MMU time slice") \
2073 \
2074 product(uintx, GCPauseIntervalMillis, 0, \
2075 "Time slice for MMU specification") \
2076 \
2077 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2078 "Adaptive size policy maximum GC minor pause time goal in msec") \
2079 \
2080 product(uintx, GCTimeRatio, 99, \
2081 "Adaptive size policy application time to GC time ratio") \
2082 \
2083 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2084 "Adaptive size scale down factor for shrinking") \
2085 \
2086 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2087 "Adaptive size decays the major cost for long major intervals") \
2088 \
2089 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2090 "Time scale over which major costs decay") \
2091 \
2092 product(uintx, MinSurvivorRatio, 3, \
2093 "Minimum ratio of young generation/survivor space size") \
2094 \
2095 product(uintx, InitialSurvivorRatio, 8, \
2096 "Initial ratio of eden/survivor space size") \
2097 \
2098 product(uintx, BaseFootPrintEstimate, 256*M, \
2099 "Estimate of footprint other than Java Heap") \
2100 \
2101 product(bool, UseGCOverheadLimit, true, \
2102 "Use policy to limit of proportion of time spent in GC " \
2103 "before an OutOfMemory error is thrown") \
2104 \
2105 product(uintx, GCTimeLimit, 98, \
2106 "Limit of proportion of time spent in GC before an OutOfMemory" \
2107 "error is thrown (used with GCHeapFreeLimit)") \
2108 \
2109 product(uintx, GCHeapFreeLimit, 2, \
2110 "Minimum percentage of free space after a full GC before an " \
2111 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2112 \
2113 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2114 "Number of consecutive collections before gc time limit fires") \
2115 \
2116 product(bool, PrintAdaptiveSizePolicy, false, \
2117 "Print information about AdaptiveSizePolicy") \
2118 \
2119 product(intx, PrefetchCopyIntervalInBytes, -1, \
2120 "How far ahead to prefetch destination area (<= 0 means off)") \
2121 \
2122 product(intx, PrefetchScanIntervalInBytes, -1, \
2123 "How far ahead to prefetch scan area (<= 0 means off)") \
2124 \
2125 product(intx, PrefetchFieldsAhead, -1, \
2126 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2127 \
2128 diagnostic(bool, VerifySilently, false, \
2129 "Don't print print the verification progress") \
2130 \
2131 diagnostic(bool, VerifyDuringStartup, false, \
2132 "Verify memory system before executing any Java code " \
2133 "during VM initialization") \
2134 \
2135 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2136 "Verify system before exiting") \
2137 \
2138 diagnostic(bool, VerifyBeforeGC, false, \
2139 "Verify memory system before GC") \
2140 \
2141 diagnostic(bool, VerifyAfterGC, false, \
2142 "Verify memory system after GC") \
2143 \
2144 diagnostic(bool, VerifyDuringGC, false, \
2145 "Verify memory system during GC (between phases)") \
2146 \
2147 diagnostic(bool, GCParallelVerificationEnabled, true, \
2148 "Enable parallel memory system verification") \
2149 \
2150 diagnostic(bool, DeferInitialCardMark, false, \
2151 "When +ReduceInitialCardMarks, explicitly defer any that " \
2152 "may arise from new_pre_store_barrier") \
2153 \
2154 diagnostic(bool, VerifyRememberedSets, false, \
2155 "Verify GC remembered sets") \
2156 \
2157 diagnostic(bool, VerifyObjectStartArray, true, \
2158 "Verify GC object start array if verify before/after") \
2159 \
2160 product(bool, DisableExplicitGC, false, \
2161 "Tells whether calling System.gc() does a full GC") \
2162 \
2163 notproduct(bool, CheckMemoryInitialization, false, \
2164 "Checks memory initialization") \
2165 \
2166 product(bool, CollectGen0First, false, \
2167 "Collect youngest generation before each full GC") \
2168 \
2169 diagnostic(bool, BindCMSThreadToCPU, false, \
2170 "Bind CMS Thread to CPU if possible") \
2171 \
2172 diagnostic(uintx, CPUForCMSThread, 0, \
2173 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2174 \
2175 product(bool, BindGCTaskThreadsToCPUs, false, \
2176 "Bind GCTaskThreads to CPUs if possible") \
2177 \
2178 product(bool, UseGCTaskAffinity, false, \
2179 "Use worker affinity when asking for GCTasks") \
2180 \
2181 product(uintx, ProcessDistributionStride, 4, \
2182 "Stride through processors when distributing processes") \
2183 \
2184 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2185 "number of times the coordinator GC thread will sleep while " \
2186 "yielding before giving up and resuming GC") \
2187 \
2188 product(uintx, CMSYieldSleepCount, 0, \
2189 "number of times a GC thread (minus the coordinator) " \
2190 "will sleep while yielding before giving up and resuming GC") \
2191 \
2192 /* gc tracing */ \
2193 manageable(bool, PrintGC, false, \
2194 "Print message at garbage collect") \
2195 \
2196 manageable(bool, PrintGCDetails, false, \
2197 "Print more details at garbage collect") \
2198 \
2199 manageable(bool, PrintGCDateStamps, false, \
2200 "Print date stamps at garbage collect") \
2201 \
2202 manageable(bool, PrintGCTimeStamps, false, \
2203 "Print timestamps at garbage collect") \
2204 \
2205 product(bool, PrintGCTaskTimeStamps, false, \
2206 "Print timestamps for individual gc worker thread tasks") \
2207 \
2208 develop(intx, ConcGCYieldTimeout, 0, \
2209 "If non-zero, assert that GC threads yield within this # of ms.") \
2210 \
2211 notproduct(bool, TraceMarkSweep, false, \
2212 "Trace mark sweep") \
2213 \
2214 product(bool, PrintReferenceGC, false, \
2215 "Print times spent handling reference objects during GC " \
2216 " (enabled only when PrintGCDetails)") \
2217 \
2218 develop(bool, TraceReferenceGC, false, \
2219 "Trace handling of soft/weak/final/phantom references") \
2220 \
2221 develop(bool, TraceFinalizerRegistration, false, \
2222 "Trace registration of final references") \
2223 \
2224 notproduct(bool, TraceScavenge, false, \
2225 "Trace scavenge") \
2226 \
2227 product_rw(bool, TraceClassLoading, false, \
2228 "Trace all classes loaded") \
2229 \
2230 product(bool, TraceClassLoadingPreorder, false, \
2231 "Trace all classes loaded in order referenced (not loaded)") \
2232 \
2233 product_rw(bool, TraceClassUnloading, false, \
2234 "Trace unloading of classes") \
2235 \
2236 product_rw(bool, TraceLoaderConstraints, false, \
2237 "Trace loader constraints") \
2238 \
2239 develop(bool, TraceClassLoaderData, false, \
2240 "Trace class loader loader_data lifetime") \
2241 \
2242 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2243 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2244 "Initial size of the boot class loader data metaspace") \
2245 \
2246 product(bool, TraceGen0Time, false, \
2247 "Trace accumulated time for Gen 0 collection") \
2248 \
2249 product(bool, TraceGen1Time, false, \
2250 "Trace accumulated time for Gen 1 collection") \
2251 \
2252 product(bool, PrintTenuringDistribution, false, \
2253 "Print tenuring age information") \
2254 \
2255 product_rw(bool, PrintHeapAtGC, false, \
2256 "Print heap layout before and after each GC") \
2257 \
2258 product_rw(bool, PrintHeapAtGCExtended, false, \
2259 "Prints extended information about the layout of the heap " \
2260 "when -XX:+PrintHeapAtGC is set") \
2261 \
2262 product(bool, PrintHeapAtSIGBREAK, true, \
2263 "Print heap layout in response to SIGBREAK") \
2264 \
2265 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2266 "Print a class histogram before any major stop-world GC") \
2267 \
2268 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2269 "Print a class histogram after any major stop-world GC") \
2270 \
2271 manageable(bool, PrintClassHistogram, false, \
2272 "Print a histogram of class instances") \
2273 \
2274 develop(bool, TraceWorkGang, false, \
2275 "Trace activities of work gangs") \
2276 \
2277 product(bool, TraceParallelOldGCTasks, false, \
2278 "Trace multithreaded GC activity") \
2279 \
2280 develop(bool, TraceBlockOffsetTable, false, \
2281 "Print BlockOffsetTable maps") \
2282 \
2283 develop(bool, TraceCardTableModRefBS, false, \
2284 "Print CardTableModRefBS maps") \
2285 \
2286 develop(bool, TraceGCTaskManager, false, \
2287 "Trace actions of the GC task manager") \
2288 \
2289 develop(bool, TraceGCTaskQueue, false, \
2290 "Trace actions of the GC task queues") \
2291 \
2292 diagnostic(bool, TraceGCTaskThread, false, \
2293 "Trace actions of the GC task threads") \
2294 \
2295 product(bool, PrintParallelOldGCPhaseTimes, false, \
2296 "Print the time taken by each parallel old gc phase." \
2297 "PrintGCDetails must also be enabled.") \
2298 \
2299 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2300 "Trace parallel old gc marking phase") \
2301 \
2302 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2303 "Trace parallel old gc summary phase") \
2304 \
2305 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2306 "Trace parallel old gc compaction phase") \
2307 \
2308 develop(bool, TraceParallelOldGCDensePrefix, false, \
2309 "Trace parallel old gc dense prefix computation") \
2310 \
2311 develop(bool, IgnoreLibthreadGPFault, false, \
2312 "Suppress workaround for libthread GP fault") \
2313 \
2314 product(bool, PrintJNIGCStalls, false, \
2315 "Print diagnostic message when GC is stalled" \
2316 "by JNI critical section") \
2317 \
2318 experimental(double, ObjectCountCutOffPercent, 0.5, \
2319 "The percentage of the used heap that the instances of a class " \
2320 "must occupy for the class to generate a trace event.") \
2321 \
2322 /* GC log rotation setting */ \
2323 \
2324 product(bool, UseGCLogFileRotation, false, \
2325 "Prevent large gclog file for long running app. " \
2326 "Requires -Xloggc:<filename>") \
2327 \
2328 product(uintx, NumberOfGCLogFiles, 0, \
2329 "Number of gclog files in rotation, " \
2330 "Default: 0, no rotation") \
2331 \
2332 product(uintx, GCLogFileSize, 0, \
2333 "GC log file size, Default: 0 bytes, no rotation " \
2334 "Only valid with UseGCLogFileRotation") \
2335 \
2336 /* JVMTI heap profiling */ \
2337 \
2338 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2339 "Trace JVMTI object tagging calls") \
2340 \
2341 diagnostic(bool, VerifyBeforeIteration, false, \
2342 "Verify memory system before JVMTI iteration") \
2343 \
2344 /* compiler interface */ \
2345 \
2346 develop(bool, CIPrintCompilerName, false, \
2347 "when CIPrint is active, print the name of the active compiler") \
2348 \
2349 develop(bool, CIPrintCompileQueue, false, \
2350 "display the contents of the compile queue whenever a " \
2351 "compilation is enqueued") \
2352 \
2353 develop(bool, CIPrintRequests, false, \
2354 "display every request for compilation") \
2355 \
2356 product(bool, CITime, false, \
2357 "collect timing information for compilation") \
2358 \
2359 develop(bool, CITimeEach, false, \
2360 "display timing information after each successful compilation") \
2361 \
2362 develop(bool, CICountOSR, false, \
2363 "use a separate counter when assigning ids to osr compilations") \
2364 \
2365 develop(bool, CICompileNatives, true, \
2366 "compile native methods if supported by the compiler") \
2367 \
2368 develop_pd(bool, CICompileOSR, \
2369 "compile on stack replacement methods if supported by the " \
2370 "compiler") \
2371 \
2372 develop(bool, CIPrintMethodCodes, false, \
2373 "print method bytecodes of the compiled code") \
2374 \
2375 develop(bool, CIPrintTypeFlow, false, \
2376 "print the results of ciTypeFlow analysis") \
2377 \
2378 develop(bool, CITraceTypeFlow, false, \
2379 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2380 \
2381 develop(intx, OSROnlyBCI, -1, \
2382 "OSR only at this bci. Negative values mean exclude that bci") \
2383 \
2384 /* compiler */ \
2385 \
2386 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2387 "Number of compiler threads to run") \
2388 \
2389 product(intx, CompilationPolicyChoice, 0, \
2390 "which compilation policy (0/1)") \
2391 \
2392 develop(bool, UseStackBanging, true, \
2393 "use stack banging for stack overflow checks (required for " \
2394 "proper StackOverflow handling; disable only to measure cost " \
2395 "of stackbanging)") \
2396 \
2397 develop(bool, UseStrictFP, true, \
2398 "use strict fp if modifier strictfp is set") \
2399 \
2400 develop(bool, GenerateSynchronizationCode, true, \
2401 "generate locking/unlocking code for synchronized methods and " \
2402 "monitors") \
2403 \
2404 develop(bool, GenerateCompilerNullChecks, true, \
2405 "Generate explicit null checks for loads/stores/calls") \
2406 \
2407 develop(bool, GenerateRangeChecks, true, \
2408 "Generate range checks for array accesses") \
2409 \
2410 develop_pd(bool, ImplicitNullChecks, \
2411 "generate code for implicit null checks") \
2412 \
2413 product(bool, PrintSafepointStatistics, false, \
2414 "print statistics about safepoint synchronization") \
2415 \
2416 product(intx, PrintSafepointStatisticsCount, 300, \
2417 "total number of safepoint statistics collected " \
2418 "before printing them out") \
2419 \
2420 product(intx, PrintSafepointStatisticsTimeout, -1, \
2421 "print safepoint statistics only when safepoint takes" \
2422 " more than PrintSafepointSatisticsTimeout in millis") \
2423 \
2424 product(bool, TraceSafepointCleanupTime, false, \
2425 "print the break down of clean up tasks performed during" \
2426 " safepoint") \
2427 \
2428 product(bool, Inline, true, \
2429 "enable inlining") \
2430 \
2431 product(bool, ClipInlining, true, \
2432 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2433 \
2434 develop(bool, UseCHA, true, \
2435 "enable CHA") \
2436 \
2437 product(bool, UseTypeProfile, true, \
2438 "Check interpreter profile for historically monomorphic calls") \
2439 \
2440 notproduct(bool, TimeCompiler, false, \
2441 "time the compiler") \
2442 \
2443 diagnostic(bool, PrintInlining, false, \
2444 "prints inlining optimizations") \
2445 \
2446 product(bool, UsePopCountInstruction, false, \
2447 "Use population count instruction") \
2448 \
2449 develop(bool, EagerInitialization, false, \
2450 "Eagerly initialize classes if possible") \
2451 \
2452 develop(bool, TraceMethodReplacement, false, \
2453 "Print when methods are replaced do to recompilation") \
2454 \
2455 develop(bool, PrintMethodFlushing, false, \
2456 "print the nmethods being flushed") \
2457 \
2458 develop(bool, UseRelocIndex, false, \
2459 "use an index to speed random access to relocations") \
2460 \
2461 develop(bool, StressCodeBuffers, false, \
2462 "Exercise code buffer expansion and other rare state changes") \
2463 \
2464 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2465 "Generate extra debugging info for non-safepoints in nmethods") \
2466 \
2467 product(bool, PrintVMOptions, false, \
2468 "Print flags that appeared on the command line") \
2469 \
2470 product(bool, IgnoreUnrecognizedVMOptions, false, \
2471 "Ignore unrecognized VM options") \
2472 \
2473 product(bool, PrintCommandLineFlags, false, \
2474 "Print flags specified on command line or set by ergonomics") \
2475 \
2476 product(bool, PrintFlagsInitial, false, \
2477 "Print all VM flags before argument processing and exit VM") \
2478 \
2479 product(bool, PrintFlagsFinal, false, \
2480 "Print all VM flags after argument and ergonomic processing") \
2481 \
2482 notproduct(bool, PrintFlagsWithComments, false, \
2483 "Print all VM flags with default values and descriptions and exit")\
2484 \
2485 diagnostic(bool, SerializeVMOutput, true, \
2486 "Use a mutex to serialize output to tty and hotspot.log") \
2487 \
2488 diagnostic(bool, DisplayVMOutput, true, \
2489 "Display all VM output on the tty, independently of LogVMOutput") \
2490 \
2491 diagnostic(bool, LogVMOutput, trueInDebug, \
2492 "Save VM output to hotspot.log, or to LogFile") \
2493 \
2494 diagnostic(ccstr, LogFile, NULL, \
2495 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2496 \
2497 product(ccstr, ErrorFile, NULL, \
2498 "If an error occurs, save the error data to this file " \
2499 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2500 \
2501 product(bool, DisplayVMOutputToStderr, false, \
2502 "If DisplayVMOutput is true, display all VM output to stderr") \
2503 \
2504 product(bool, DisplayVMOutputToStdout, false, \
2505 "If DisplayVMOutput is true, display all VM output to stdout") \
2506 \
2507 product(bool, UseHeavyMonitors, false, \
2508 "use heavyweight instead of lightweight Java monitors") \
2509 \
2510 product(bool, PrintStringTableStatistics, false, \
2511 "print statistics about the StringTable and SymbolTable") \
2512 \
2513 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2514 "print histogram of the symbol table") \
2515 \
2516 notproduct(bool, ExitVMOnVerifyError, false, \
2517 "standard exit from VM if bytecode verify error " \
2518 "(only in debug mode)") \
2519 \
2520 notproduct(ccstr, AbortVMOnException, NULL, \
2521 "Call fatal if this exception is thrown. Example: " \
2522 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2523 \
2524 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2525 "Call fatal if the exception pointed by AbortVMOnException " \
2526 "has this message.") \
2527 \
2528 develop(bool, DebugVtables, false, \
2529 "add debugging code to vtable dispatch") \
2530 \
2531 develop(bool, PrintVtables, false, \
2532 "print vtables when printing klass") \
2533 \
2534 notproduct(bool, PrintVtableStats, false, \
2535 "print vtables stats at end of run") \
2536 \
2537 develop(bool, TraceCreateZombies, false, \
2538 "trace creation of zombie nmethods") \
2539 \
2540 notproduct(bool, IgnoreLockingAssertions, false, \
2541 "disable locking assertions (for speed)") \
2542 \
2543 product(bool, RangeCheckElimination, true, \
2544 "Eliminate range checks") \
2545 \
2546 develop_pd(bool, UncommonNullCast, \
2547 "track occurrences of null in casts; adjust compiler tactics") \
2548 \
2549 develop(bool, TypeProfileCasts, true, \
2550 "treat casts like calls for purposes of type profiling") \
2551 \
2552 develop(bool, DelayCompilationDuringStartup, true, \
2553 "Delay invoking the compiler until main application class is " \
2554 "loaded") \
2555 \
2556 develop(bool, CompileTheWorld, false, \
2557 "Compile all methods in all classes in bootstrap class path " \
2558 "(stress test)") \
2559 \
2560 develop(bool, CompileTheWorldPreloadClasses, true, \
2561 "Preload all classes used by a class before start loading") \
2562 \
2563 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2564 "Force a safepoint every n compiles so sweeper can keep up") \
2565 \
2566 develop(bool, FillDelaySlots, true, \
2567 "Fill delay slots (on SPARC only)") \
2568 \
2569 develop(bool, TimeLivenessAnalysis, false, \
2570 "Time computation of bytecode liveness analysis") \
2571 \
2572 develop(bool, TraceLivenessGen, false, \
2573 "Trace the generation of liveness analysis information") \
2574 \
2575 notproduct(bool, TraceLivenessQuery, false, \
2576 "Trace queries of liveness analysis information") \
2577 \
2578 notproduct(bool, CollectIndexSetStatistics, false, \
2579 "Collect information about IndexSets") \
2580 \
2581 develop(bool, UseLoopSafepoints, true, \
2582 "Generate Safepoint nodes in every loop") \
2583 \
2584 develop(intx, FastAllocateSizeLimit, 128*K, \
2585 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2586 "Inline allocations larger than this in doublewords must go slow")\
2587 \
2588 product(bool, AggressiveOpts, false, \
2589 "Enable aggressive optimizations - see arguments.cpp") \
2590 \
2591 product(bool, UseStringCache, false, \
2592 "Enable String cache capabilities on String.java") \
2593 \
2594 /* statistics */ \
2595 develop(bool, CountCompiledCalls, false, \
2596 "counts method invocations") \
2597 \
2598 notproduct(bool, CountRuntimeCalls, false, \
2599 "counts VM runtime calls") \
2600 \
2601 develop(bool, CountJNICalls, false, \
2602 "counts jni method invocations") \
2603 \
2604 notproduct(bool, CountJVMCalls, false, \
2605 "counts jvm method invocations") \
2606 \
2607 notproduct(bool, CountRemovableExceptions, false, \
2608 "count exceptions that could be replaced by branches due to " \
2609 "inlining") \
2610 \
2611 notproduct(bool, ICMissHistogram, false, \
2612 "produce histogram of IC misses") \
2613 \
2614 notproduct(bool, PrintClassStatistics, false, \
2615 "prints class statistics at end of run") \
2616 \
2617 notproduct(bool, PrintMethodStatistics, false, \
2618 "prints method statistics at end of run") \
2619 \
2620 /* interpreter */ \
2621 develop(bool, ClearInterpreterLocals, false, \
2622 "Always clear local variables of interpreter activations upon " \
2623 "entry") \
2624 \
2625 product_pd(bool, RewriteBytecodes, \
2626 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2627 \
2628 product_pd(bool, RewriteFrequentPairs, \
2629 "Rewrite frequently used bytecode pairs into a single bytecode") \
2630 \
2631 diagnostic(bool, PrintInterpreter, false, \
2632 "Prints the generated interpreter code") \
2633 \
2634 product(bool, UseInterpreter, true, \
2635 "Use interpreter for non-compiled methods") \
2636 \
2637 develop(bool, UseFastSignatureHandlers, true, \
2638 "Use fast signature handlers for native calls") \
2639 \
2640 product(bool, UseLoopCounter, true, \
2641 "Increment invocation counter on backward branch") \
2642 \
2643 product(bool, UseFastEmptyMethods, true, \
2644 "Use fast method entry code for empty methods") \
2645 \
2646 product(bool, UseFastAccessorMethods, true, \
2647 "Use fast method entry code for accessor methods") \
2648 \
2649 product_pd(bool, UseOnStackReplacement, \
2650 "Use on stack replacement, calls runtime if invoc. counter " \
2651 "overflows in loop") \
2652 \
2653 notproduct(bool, TraceOnStackReplacement, false, \
2654 "Trace on stack replacement") \
2655 \
2656 product_pd(bool, PreferInterpreterNativeStubs, \
2657 "Use always interpreter stubs for native methods invoked via " \
2658 "interpreter") \
2659 \
2660 develop(bool, CountBytecodes, false, \
2661 "Count number of bytecodes executed") \
2662 \
2663 develop(bool, PrintBytecodeHistogram, false, \
2664 "Print histogram of the executed bytecodes") \
2665 \
2666 develop(bool, PrintBytecodePairHistogram, false, \
2667 "Print histogram of the executed bytecode pairs") \
2668 \
2669 diagnostic(bool, PrintSignatureHandlers, false, \
2670 "Print code generated for native method signature handlers") \
2671 \
2672 develop(bool, VerifyOops, false, \
2673 "Do plausibility checks for oops") \
2674 \
2675 develop(bool, CheckUnhandledOops, false, \
2676 "Check for unhandled oops in VM code") \
2677 \
2678 develop(bool, VerifyJNIFields, trueInDebug, \
2679 "Verify jfieldIDs for instance fields") \
2680 \
2681 notproduct(bool, VerifyJNIEnvThread, false, \
2682 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2683 "from JNI") \
2684 \
2685 develop(bool, VerifyFPU, false, \
2686 "Verify FPU state (check for NaN's, etc.)") \
2687 \
2688 develop(bool, VerifyThread, false, \
2689 "Watch the thread register for corruption (SPARC only)") \
2690 \
2691 develop(bool, VerifyActivationFrameSize, false, \
2692 "Verify that activation frame didn't become smaller than its " \
2693 "minimal size") \
2694 \
2695 develop(bool, TraceFrequencyInlining, false, \
2696 "Trace frequency based inlining") \
2697 \
2698 develop_pd(bool, InlineIntrinsics, \
2699 "Inline intrinsics that can be statically resolved") \
2700 \
2701 product_pd(bool, ProfileInterpreter, \
2702 "Profile at the bytecode level during interpretation") \
2703 \
2704 develop_pd(bool, ProfileTraps, \
2705 "Profile deoptimization traps at the bytecode level") \
2706 \
2707 product(intx, ProfileMaturityPercentage, 20, \
2708 "number of method invocations/branches (expressed as % of " \
2709 "CompileThreshold) before using the method's profile") \
2710 \
2711 develop(bool, PrintMethodData, false, \
2712 "Print the results of +ProfileInterpreter at end of run") \
2713 \
2714 develop(bool, VerifyDataPointer, trueInDebug, \
2715 "Verify the method data pointer during interpreter profiling") \
2716 \
2717 develop(bool, VerifyCompiledCode, false, \
2718 "Include miscellaneous runtime verifications in nmethod code; " \
2719 "default off because it disturbs nmethod size heuristics") \
2720 \
2721 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2722 "Manually make GC thread crash then dump java stack trace; " \
2723 "Test only") \
2724 \
2725 /* compilation */ \
2726 product(bool, UseCompiler, true, \
2727 "use compilation") \
2728 \
2729 develop(bool, TraceCompilationPolicy, false, \
2730 "Trace compilation policy") \
2731 \
2732 develop(bool, TimeCompilationPolicy, false, \
2733 "Time the compilation policy") \
2734 \
2735 product(bool, UseCounterDecay, true, \
2736 "adjust recompilation counters") \
2737 \
2738 develop(intx, CounterHalfLifeTime, 30, \
2739 "half-life time of invocation counters (in secs)") \
2740 \
2741 develop(intx, CounterDecayMinIntervalLength, 500, \
2742 "Min. ms. between invocation of CounterDecay") \
2743 \
2744 product(bool, AlwaysCompileLoopMethods, false, \
2745 "when using recompilation, never interpret methods " \
2746 "containing loops") \
2747 \
2748 product(bool, DontCompileHugeMethods, true, \
2749 "don't compile methods > HugeMethodLimit") \
2750 \
2751 /* Bytecode escape analysis estimation. */ \
2752 product(bool, EstimateArgEscape, true, \
2753 "Analyze bytecodes to estimate escape state of arguments") \
2754 \
2755 product(intx, BCEATraceLevel, 0, \
2756 "How much tracing to do of bytecode escape analysis estimates") \
2757 \
2758 product(intx, MaxBCEAEstimateLevel, 5, \
2759 "Maximum number of nested calls that are analyzed by BC EA.") \
2760 \
2761 product(intx, MaxBCEAEstimateSize, 150, \
2762 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2763 \
2764 product(intx, AllocatePrefetchStyle, 1, \
2765 "0 = no prefetch, " \
2766 "1 = prefetch instructions for each allocation, " \
2767 "2 = use TLAB watermark to gate allocation prefetch, " \
2768 "3 = use BIS instruction on Sparc for allocation prefetch") \
2769 \
2770 product(intx, AllocatePrefetchDistance, -1, \
2771 "Distance to prefetch ahead of allocation pointer") \
2772 \
2773 product(intx, AllocatePrefetchLines, 3, \
2774 "Number of lines to prefetch ahead of array allocation pointer") \
2775 \
2776 product(intx, AllocateInstancePrefetchLines, 1, \
2777 "Number of lines to prefetch ahead of instance allocation pointer") \
2778 \
2779 product(intx, AllocatePrefetchStepSize, 16, \
2780 "Step size in bytes of sequential prefetch instructions") \
2781 \
2782 product(intx, AllocatePrefetchInstr, 0, \
2783 "Prefetch instruction to prefetch ahead of allocation pointer") \
2784 \
2785 /* deoptimization */ \
2786 develop(bool, TraceDeoptimization, false, \
2787 "Trace deoptimization") \
2788 \
2789 develop(bool, DebugDeoptimization, false, \
2790 "Tracing various information while debugging deoptimization") \
2791 \
2792 product(intx, SelfDestructTimer, 0, \
2793 "Will cause VM to terminate after a given time (in minutes) " \
2794 "(0 means off)") \
2795 \
2796 product(intx, MaxJavaStackTraceDepth, 1024, \
2797 "Max. no. of lines in the stack trace for Java exceptions " \
2798 "(0 means all)") \
2799 \
2800 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2801 "Guarantee a safepoint (at least) every so many milliseconds " \
2802 "(0 means none)")) \
2803 \
2804 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2805 "Guarantee a safepoint (at least) every so many milliseconds " \
2806 "(0 means none)")) \
2807 \
2808 product(intx, SafepointTimeoutDelay, 10000, \
2809 "Delay in milliseconds for option SafepointTimeout") \
2810 \
2811 product(intx, NmethodSweepFraction, 16, \
2812 "Number of invocations of sweeper to cover all nmethods") \
2813 \
2814 product(intx, NmethodSweepCheckInterval, 5, \
2815 "Compilers wake up every n seconds to possibly sweep nmethods") \
2816 \
2817 notproduct(bool, LogSweeper, false, \
2818 "Keep a ring buffer of sweeper activity") \
2819 \
2820 notproduct(intx, SweeperLogEntries, 1024, \
2821 "Number of records in the ring buffer of sweeper activity") \
2822 \
2823 notproduct(intx, MemProfilingInterval, 500, \
2824 "Time between each invocation of the MemProfiler") \
2825 \
2826 develop(intx, MallocCatchPtr, -1, \
2827 "Hit breakpoint when mallocing/freeing this pointer") \
2828 \
2829 notproduct(intx, AssertRepeat, 1, \
2830 "number of times to evaluate expression in assert " \
2831 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2832 \
2833 notproduct(ccstrlist, SuppressErrorAt, "", \
2834 "List of assertions (file:line) to muzzle") \
2835 \
2836 notproduct(uintx, HandleAllocationLimit, 1024, \
2837 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2838 "is used") \
2839 \
2840 develop(uintx, TotalHandleAllocationLimit, 1024, \
2841 "Threshold for total handle allocation when " \
2842 "+TraceHandleAllocation is used") \
2843 \
2844 develop(intx, StackPrintLimit, 100, \
2845 "number of stack frames to print in VM-level stack dump") \
2846 \
2847 notproduct(intx, MaxElementPrintSize, 256, \
2848 "maximum number of elements to print") \
2849 \
2850 notproduct(intx, MaxSubklassPrintSize, 4, \
2851 "maximum number of subklasses to print when printing klass") \
2852 \
2853 product(intx, MaxInlineLevel, 9, \
2854 "maximum number of nested calls that are inlined") \
2855 \
2856 product(intx, MaxRecursiveInlineLevel, 1, \
2857 "maximum number of nested recursive calls that are inlined") \
2858 \
2859 product_pd(intx, InlineSmallCode, \
2860 "Only inline already compiled methods if their code size is " \
2861 "less than this") \
2862 \
2863 product(intx, MaxInlineSize, 35, \
2864 "maximum bytecode size of a method to be inlined") \
2865 \
2866 product_pd(intx, FreqInlineSize, \
2867 "maximum bytecode size of a frequent method to be inlined") \
2868 \
2869 product(intx, MaxTrivialSize, 6, \
2870 "maximum bytecode size of a trivial method to be inlined") \
2871 \
2872 product(intx, MinInliningThreshold, 250, \
2873 "min. invocation count a method needs to have to be inlined") \
2874 \
2875 develop(intx, MethodHistogramCutoff, 100, \
2876 "cutoff value for method invoc. histogram (+CountCalls)") \
2877 \
2878 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2879 "# of interpreted methods to show in profile") \
2880 \
2881 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2882 "# of compiled methods to show in profile") \
2883 \
2884 develop(intx, ProfilerNumberOfStubMethods, 25, \
2885 "# of stub methods to show in profile") \
2886 \
2887 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2888 "# of runtime stub nodes to show in profile") \
2889 \
2890 product(intx, ProfileIntervalsTicks, 100, \
2891 "# of ticks between printing of interval profile " \
2892 "(+ProfileIntervals)") \
2893 \
2894 notproduct(intx, ScavengeALotInterval, 1, \
2895 "Interval between which scavenge will occur with +ScavengeALot") \
2896 \
2897 notproduct(intx, FullGCALotInterval, 1, \
2898 "Interval between which full gc will occur with +FullGCALot") \
2899 \
2900 notproduct(intx, FullGCALotStart, 0, \
2901 "For which invocation to start FullGCAlot") \
2902 \
2903 notproduct(intx, FullGCALotDummies, 32*K, \
2904 "Dummy object allocated with +FullGCALot, forcing all objects " \
2905 "to move") \
2906 \
2907 develop(intx, DontYieldALotInterval, 10, \
2908 "Interval between which yields will be dropped (milliseconds)") \
2909 \
2910 develop(intx, MinSleepInterval, 1, \
2911 "Minimum sleep() interval (milliseconds) when " \
2912 "ConvertSleepToYield is off (used for SOLARIS)") \
2913 \
2914 develop(intx, ProfilerPCTickThreshold, 15, \
2915 "Number of ticks in a PC buckets to be a hotspot") \
2916 \
2917 notproduct(intx, DeoptimizeALotInterval, 5, \
2918 "Number of exits until DeoptimizeALot kicks in") \
2919 \
2920 notproduct(intx, ZombieALotInterval, 5, \
2921 "Number of exits until ZombieALot kicks in") \
2922 \
2923 develop(bool, StressNonEntrant, false, \
2924 "Mark nmethods non-entrant at registration") \
2925 \
2926 diagnostic(intx, MallocVerifyInterval, 0, \
2927 "if non-zero, verify C heap after every N calls to " \
2928 "malloc/realloc/free") \
2929 \
2930 diagnostic(intx, MallocVerifyStart, 0, \
2931 "if non-zero, start verifying C heap after Nth call to " \
2932 "malloc/realloc/free") \
2933 \
2934 diagnostic(uintx, MallocMaxTestWords, 0, \
2935 "if non-zero, max # of Words that malloc/realloc can allocate " \
2936 "(for testing only)") \
2937 \
2938 product(intx, TypeProfileWidth, 2, \
2939 "number of receiver types to record in call/cast profile") \
2940 \
2941 develop(intx, BciProfileWidth, 2, \
2942 "number of return bci's to record in ret profile") \
2943 \
2944 product(intx, PerMethodRecompilationCutoff, 400, \
2945 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2946 \
2947 product(intx, PerBytecodeRecompilationCutoff, 200, \
2948 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
2949 \
2950 product(intx, PerMethodTrapLimit, 100, \
2951 "Limit on traps (of one kind) in a method (includes inlines)") \
2952 \
2953 product(intx, PerBytecodeTrapLimit, 4, \
2954 "Limit on traps (of one kind) at a particular BCI") \
2955 \
2956 develop(intx, InlineFrequencyRatio, 20, \
2957 "Ratio of call site execution to caller method invocation") \
2958 \
2959 develop_pd(intx, InlineFrequencyCount, \
2960 "Count of call site execution necessary to trigger frequent " \
2961 "inlining") \
2962 \
2963 develop(intx, InlineThrowCount, 50, \
2964 "Force inlining of interpreted methods that throw this often") \
2965 \
2966 develop(intx, InlineThrowMaxSize, 200, \
2967 "Force inlining of throwing methods smaller than this") \
2968 \
2969 develop(intx, ProfilerNodeSize, 1024, \
2970 "Size in K to allocate for the Profile Nodes of each thread") \
2971 \
2972 product_pd(intx, PreInflateSpin, \
2973 "Number of times to spin wait before inflation") \
2974 \
2975 /* gc parameters */ \
2976 product(uintx, InitialHeapSize, 0, \
2977 "Initial heap size (in bytes); zero means use ergonomics") \
2978 \
2979 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
2980 "Maximum heap size (in bytes)") \
2981 \
2982 product(uintx, OldSize, ScaleForWordSize(4*M), \
2983 "Initial tenured generation size (in bytes)") \
2984 \
2985 product(uintx, NewSize, ScaleForWordSize(1*M), \
2986 "Initial new generation size (in bytes)") \
2987 \
2988 product(uintx, MaxNewSize, max_uintx, \
2989 "Maximum new generation size (in bytes), max_uintx means set " \
2990 "ergonomically") \
2991 \
2992 product(uintx, PretenureSizeThreshold, 0, \
2993 "Maximum size in bytes of objects allocated in DefNew " \
2994 "generation; zero means no maximum") \
2995 \
2996 product(uintx, TLABSize, 0, \
2997 "Starting TLAB size (in bytes); zero means set ergonomically") \
2998 \
2999 product(uintx, MinTLABSize, 2*K, \
3000 "Minimum allowed TLAB size (in bytes)") \
3001 \
3002 product(uintx, TLABAllocationWeight, 35, \
3003 "Allocation averaging weight") \
3004 \
3005 product(uintx, TLABWasteTargetPercent, 1, \
3006 "Percentage of Eden that can be wasted") \
3007 \
3008 product(uintx, TLABRefillWasteFraction, 64, \
3009 "Max TLAB waste at a refill (internal fragmentation)") \
3010 \
3011 product(uintx, TLABWasteIncrement, 4, \
3012 "Increment allowed waste at slow allocation") \
3013 \
3014 product(uintx, SurvivorRatio, 8, \
3015 "Ratio of eden/survivor space size") \
3016 \
3017 product(uintx, NewRatio, 2, \
3018 "Ratio of new/old generation sizes") \
3019 \
3020 product_pd(uintx, NewSizeThreadIncrease, \
3021 "Additional size added to desired new generation size per " \
3022 "non-daemon thread (in bytes)") \
3023 \
3024 product_pd(uintx, MetaspaceSize, \
3025 "Initial size of Metaspaces (in bytes)") \
3026 \
3027 product(uintx, MaxMetaspaceSize, max_uintx, \
3028 "Maximum size of Metaspaces (in bytes)") \
3029 \
3030 product(uintx, ClassMetaspaceSize, 2*M, \
3031 "Maximum size of InstanceKlass area in Metaspace used for " \
3032 "UseCompressedKlassPointers") \
3033 \
3034 product(uintx, MinHeapFreeRatio, 40, \
3035 "Min percentage of heap free after GC to avoid expansion") \
3036 \
3037 product(uintx, MaxHeapFreeRatio, 70, \
3038 "Max percentage of heap free after GC to avoid shrinking") \
3039 \
3040 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3041 "Number of milliseconds per MB of free space in the heap") \
3042 \
3043 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3044 "Min change in heap space due to GC (in bytes)") \
3045 \
3046 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3047 "Min expansion of Metaspace (in bytes)") \
3048 \
3049 product(uintx, MinMetaspaceFreeRatio, 40, \
3050 "Min percentage of Metaspace free after GC to avoid expansion") \
3051 \
3052 product(uintx, MaxMetaspaceFreeRatio, 70, \
3053 "Max percentage of Metaspace free after GC to avoid shrinking") \
3054 \
3055 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3056 "Max expansion of Metaspace without full GC (in bytes)") \
3057 \
3058 product(uintx, QueuedAllocationWarningCount, 0, \
3059 "Number of times an allocation that queues behind a GC " \
3060 "will retry before printing a warning") \
3061 \
3062 diagnostic(uintx, VerifyGCStartAt, 0, \
3063 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3064 \
3065 diagnostic(intx, VerifyGCLevel, 0, \
3066 "Generation level at which to start +VerifyBefore/AfterGC") \
3067 \
3068 product(uintx, MaxTenuringThreshold, 15, \
3069 "Maximum value for tenuring threshold") \
3070 \
3071 product(uintx, InitialTenuringThreshold, 7, \
3072 "Initial value for tenuring threshold") \
3073 \
3074 product(uintx, TargetSurvivorRatio, 50, \
3075 "Desired percentage of survivor space used after scavenge") \
3076 \
3077 product(uintx, MarkSweepDeadRatio, 5, \
3078 "Percentage (0-100) of the old gen allowed as dead wood." \
3079 "Serial mark sweep treats this as both the min and max value." \
3080 "CMS uses this value only if it falls back to mark sweep." \
3081 "Par compact uses a variable scale based on the density of the" \
3082 "generation and treats this as the max value when the heap is" \
3083 "either completely full or completely empty. Par compact also" \
3084 "has a smaller default value; see arguments.cpp.") \
3085 \
3086 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3087 "How often should we fully compact the heap (ignoring the dead " \
3088 "space parameters)") \
3089 \
3090 product(intx, PrintCMSStatistics, 0, \
3091 "Statistics for CMS") \
3092 \
3093 product(bool, PrintCMSInitiationStatistics, false, \
3094 "Statistics for initiating a CMS collection") \
3095 \
3096 product(intx, PrintFLSStatistics, 0, \
3097 "Statistics for CMS' FreeListSpace") \
3098 \
3099 product(intx, PrintFLSCensus, 0, \
3100 "Census for CMS' FreeListSpace") \
3101 \
3102 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3103 "Delay in ms between expansion and allocation") \
3104 \
3105 develop(uintx, GCWorkerDelayMillis, 0, \
3106 "Delay in ms in scheduling GC workers") \
3107 \
3108 product(intx, DeferThrSuspendLoopCount, 4000, \
3109 "(Unstable) Number of times to iterate in safepoint loop " \
3110 " before blocking VM threads ") \
3111 \
3112 product(intx, DeferPollingPageLoopCount, -1, \
3113 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3114 "before changing safepoint polling page to RO ") \
3115 \
3116 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3117 \
3118 product(bool, PSChunkLargeArrays, true, \
3119 "true: process large arrays in chunks") \
3120 \
3121 product(uintx, GCDrainStackTargetSize, 64, \
3122 "how many entries we'll try to leave on the stack during " \
3123 "parallel GC") \
3124 \
3125 /* stack parameters */ \
3126 product_pd(intx, StackYellowPages, \
3127 "Number of yellow zone (recoverable overflows) pages") \
3128 \
3129 product_pd(intx, StackRedPages, \
3130 "Number of red zone (unrecoverable overflows) pages") \
3131 \
3132 product_pd(intx, StackShadowPages, \
3133 "Number of shadow zone (for overflow checking) pages" \
3134 " this should exceed the depth of the VM and native call stack") \
3135 \
3136 product_pd(intx, ThreadStackSize, \
3137 "Thread Stack Size (in Kbytes)") \
3138 \
3139 product_pd(intx, VMThreadStackSize, \
3140 "Non-Java Thread Stack Size (in Kbytes)") \
3141 \
3142 product_pd(intx, CompilerThreadStackSize, \
3143 "Compiler Thread Stack Size (in Kbytes)") \
3144 \
3145 develop_pd(uintx, JVMInvokeMethodSlack, \
3146 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3147 \
3148 product(uintx, ThreadSafetyMargin, 50*M, \
3149 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3150 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3151 "disable this feature") \
3152 \
3153 /* code cache parameters */ \
3154 /* ppc64 has large code-entry alignment. */ \
3155 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \
3156 "Code cache segment size (in bytes) - smallest unit of " \
3157 "allocation") \
3158 \
3159 develop_pd(intx, CodeEntryAlignment, \
3160 "Code entry alignment for generated code (in bytes)") \
3161 \
3162 product_pd(intx, OptoLoopAlignment, \
3163 "Align inner loops to zero relative to this modulus") \
3164 \
3165 product_pd(uintx, InitialCodeCacheSize, \
3166 "Initial code cache size (in bytes)") \
3167 \
3168 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3169 "Minimum code cache size (in bytes) required to start VM.") \
3170 \
3171 product_pd(uintx, ReservedCodeCacheSize, \
3172 "Reserved code cache size (in bytes) - maximum code cache size") \
3173 \
3174 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3175 "When less than X space left, we stop compiling.") \
3176 \
3177 product_pd(uintx, CodeCacheExpansionSize, \
3178 "Code cache expansion size (in bytes)") \
3179 \
3180 develop_pd(uintx, CodeCacheMinBlockLength, \
3181 "Minimum number of segments in a code cache block.") \
3182 \
3183 notproduct(bool, ExitOnFullCodeCache, false, \
3184 "Exit the VM if we fill the code cache.") \
3185 \
3186 product(bool, UseCodeCacheFlushing, true, \
3187 "Attempt to clean the code cache before shutting off compiler") \
3188 \
3189 product(intx, MinCodeCacheFlushingInterval, 30, \
3190 "Min number of seconds between code cache cleaning sessions") \
3191 \
3192 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3193 "When less than X space left, start code cache cleaning") \
3194 \
3195 product(uintx, CodeCacheFlushingFraction, 2, \
3196 "Fraction of the code cache that is flushed when full") \
3197 \
3198 /* interpreter debugging */ \
3199 develop(intx, BinarySwitchThreshold, 5, \
3200 "Minimal number of lookupswitch entries for rewriting to binary " \
3201 "switch") \
3202 \
3203 develop(intx, StopInterpreterAt, 0, \
3204 "Stops interpreter execution at specified bytecode number") \
3205 \
3206 develop(intx, TraceBytecodesAt, 0, \
3207 "Traces bytecodes starting with specified bytecode number") \
3208 \
3209 /* compiler interface */ \
3210 develop(intx, CIStart, 0, \
3211 "the id of the first compilation to permit") \
3212 \
3213 develop(intx, CIStop, -1, \
3214 "the id of the last compilation to permit") \
3215 \
3216 develop(intx, CIStartOSR, 0, \
3217 "the id of the first osr compilation to permit " \
3218 "(CICountOSR must be on)") \
3219 \
3220 develop(intx, CIStopOSR, -1, \
3221 "the id of the last osr compilation to permit " \
3222 "(CICountOSR must be on)") \
3223 \
3224 develop(intx, CIBreakAtOSR, -1, \
3225 "id of osr compilation to break at") \
3226 \
3227 develop(intx, CIBreakAt, -1, \
3228 "id of compilation to break at") \
3229 \
3230 product(ccstrlist, CompileOnly, "", \
3231 "List of methods (pkg/class.name) to restrict compilation to") \
3232 \
3233 product(ccstr, CompileCommandFile, NULL, \
3234 "Read compiler commands from this file [.hotspot_compiler]") \
3235 \
3236 product(ccstrlist, CompileCommand, "", \
3237 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3238 \
3239 develop(bool, ReplayCompiles, false, \
3240 "Enable replay of compilations from ReplayDataFile") \
3241 \
3242 product(ccstr, ReplayDataFile, NULL, \
3243 "File containing compilation replay information" \
3244 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3245 \
3246 develop(intx, ReplaySuppressInitializers, 2, \
3247 "Controls handling of class initialization during replay" \
3248 "0 - don't do anything special" \
3249 "1 - treat all class initializers as empty" \
3250 "2 - treat class initializers for application classes as empty" \
3251 "3 - allow all class initializers to run during bootstrap but" \
3252 " pretend they are empty after starting replay") \
3253 \
3254 develop(bool, ReplayIgnoreInitErrors, false, \
3255 "Ignore exceptions thrown during initialization for replay") \
3256 \
3257 product(bool, DumpReplayDataOnError, true, \
3258 "Record replay data for crashing compiler threads") \
3259 \
3260 product(bool, CICompilerCountPerCPU, false, \
3261 "1 compiler thread for log(N CPUs)") \
3262 \
3263 develop(intx, CIFireOOMAt, -1, \
3264 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3265 "(non-negative value throws OOM after this many CI accesses " \
3266 "in each compile)") \
3267 notproduct(intx, CICrashAt, -1, \
3268 "id of compilation to trigger assert in compiler thread for " \
3269 "the purpose of testing, e.g. generation of replay data") \
3270 notproduct(bool, CIObjectFactoryVerify, false, \
3271 "enable potentially expensive verification in ciObjectFactory") \
3272 \
3273 /* Priorities */ \
3274 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3275 \
3276 product(intx, ThreadPriorityPolicy, 0, \
3277 "0 : Normal. "\
3278 " VM chooses priorities that are appropriate for normal "\
3279 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3280 " to normal native priority. Java priorities below NORM_PRIORITY"\
3281 " map to lower native priority values. On Windows applications"\
3282 " are allowed to use higher native priorities. However, with "\
3283 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3284 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3285 " interfere with system threads. On Linux thread priorities "\
3286 " are ignored because the OS does not support static priority "\
3287 " in SCHED_OTHER scheduling class which is the only choice for"\
3288 " non-root, non-realtime applications. "\
3289 "1 : Aggressive. "\
3290 " Java thread priorities map over to the entire range of "\
3291 " native thread priorities. Higher Java thread priorities map "\
3292 " to higher native thread priorities. This policy should be "\
3293 " used with care, as sometimes it can cause performance "\
3294 " degradation in the application and/or the entire system. On "\
3295 " Linux this policy requires root privilege.") \
3296 \
3297 product(bool, ThreadPriorityVerbose, false, \
3298 "Print priority changes") \
3299 \
3300 product(intx, DefaultThreadPriority, -1, \
3301 "The native priority at which threads run if not elsewhere " \
3302 "specified (-1 means no change)") \
3303 \
3304 product(intx, CompilerThreadPriority, -1, \
3305 "The native priority at which compiler threads should run " \
3306 "(-1 means no change)") \
3307 \
3308 product(intx, VMThreadPriority, -1, \
3309 "The native priority at which the VM thread should run " \
3310 "(-1 means no change)") \
3311 \
3312 product(bool, CompilerThreadHintNoPreempt, true, \
3313 "(Solaris only) Give compiler threads an extra quanta") \
3314 \
3315 product(bool, VMThreadHintNoPreempt, false, \
3316 "(Solaris only) Give VM thread an extra quanta") \
3317 \
3318 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3319 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3320 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3321 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3322 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3323 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3324 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3325 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3326 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3327 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3328 \
3329 experimental(bool, UseCriticalJavaThreadPriority, false, \
3330 "Java thread priority 10 maps to critical scheduling priority") \
3331 \
3332 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3333 "Compiler thread(s) run at critical scheduling priority") \
3334 \
3335 experimental(bool, UseCriticalCMSThreadPriority, false, \
3336 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3337 \
3338 /* compiler debugging */ \
3339 notproduct(intx, CompileTheWorldStartAt, 1, \
3340 "First class to consider when using +CompileTheWorld") \
3341 \
3342 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3343 "Last class to consider when using +CompileTheWorld") \
3344 \
3345 develop(intx, NewCodeParameter, 0, \
3346 "Testing Only: Create a dedicated integer parameter before " \
3347 "putback") \
3348 \
3349 /* new oopmap storage allocation */ \
3350 develop(intx, MinOopMapAllocation, 8, \
3351 "Minimum number of OopMap entries in an OopMapSet") \
3352 \
3353 /* Background Compilation */ \
3354 develop(intx, LongCompileThreshold, 50, \
3355 "Used with +TraceLongCompiles") \
3356 \
3357 product(intx, StarvationMonitorInterval, 200, \
3358 "Pause between each check in ms") \
3359 \
3360 /* recompilation */ \
3361 product_pd(intx, CompileThreshold, \
3362 "number of interpreted method invocations before (re-)compiling") \
3363 \
3364 product_pd(intx, BackEdgeThreshold, \
3365 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3366 \
3367 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3368 "Interpreter (tier 0) invocation notification frequency.") \
3369 \
3370 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3371 "C1 without MDO (tier 2) invocation notification frequency.") \
3372 \
3373 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3374 "C1 with MDO profiling (tier 3) invocation notification " \
3375 "frequency.") \
3376 \
3377 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3378 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3379 \
3380 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3381 "Interpreter (tier 0) invocation notification frequency.") \
3382 \
3383 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3384 "C1 without MDO (tier 2) invocation notification frequency.") \
3385 \
3386 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3387 "C1 with MDO profiling (tier 3) invocation notification " \
3388 "frequency.") \
3389 \
3390 product(intx, Tier2CompileThreshold, 0, \
3391 "threshold at which tier 2 compilation is invoked") \
3392 \
3393 product(intx, Tier2BackEdgeThreshold, 0, \
3394 "Back edge threshold at which tier 2 compilation is invoked") \
3395 \
3396 product(intx, Tier3InvocationThreshold, 200, \
3397 "Compile if number of method invocations crosses this " \
3398 "threshold") \
3399 \
3400 product(intx, Tier3MinInvocationThreshold, 100, \
3401 "Minimum invocation to compile at tier 3") \
3402 \
3403 product(intx, Tier3CompileThreshold, 2000, \
3404 "Threshold at which tier 3 compilation is invoked (invocation " \
3405 "minimum must be satisfied.") \
3406 \
3407 product(intx, Tier3BackEdgeThreshold, 60000, \
3408 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3409 \
3410 product(intx, Tier4InvocationThreshold, 5000, \
3411 "Compile if number of method invocations crosses this " \
3412 "threshold") \
3413 \
3414 product(intx, Tier4MinInvocationThreshold, 600, \
3415 "Minimum invocation to compile at tier 4") \
3416 \
3417 product(intx, Tier4CompileThreshold, 15000, \
3418 "Threshold at which tier 4 compilation is invoked (invocation " \
3419 "minimum must be satisfied.") \
3420 \
3421 product(intx, Tier4BackEdgeThreshold, 40000, \
3422 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3423 \
3424 product(intx, Tier3DelayOn, 5, \
3425 "If C2 queue size grows over this amount per compiler thread " \
3426 "stop compiling at tier 3 and start compiling at tier 2") \
3427 \
3428 product(intx, Tier3DelayOff, 2, \
3429 "If C2 queue size is less than this amount per compiler thread " \
3430 "allow methods compiled at tier 2 transition to tier 3") \
3431 \
3432 product(intx, Tier3LoadFeedback, 5, \
3433 "Tier 3 thresholds will increase twofold when C1 queue size " \
3434 "reaches this amount per compiler thread") \
3435 \
3436 product(intx, Tier4LoadFeedback, 3, \
3437 "Tier 4 thresholds will increase twofold when C2 queue size " \
3438 "reaches this amount per compiler thread") \
3439 \
3440 product(intx, TieredCompileTaskTimeout, 50, \
3441 "Kill compile task if method was not used within " \
3442 "given timeout in milliseconds") \
3443 \
3444 product(intx, TieredStopAtLevel, 4, \
3445 "Stop at given compilation level") \
3446 \
3447 product(intx, Tier0ProfilingStartPercentage, 200, \
3448 "Start profiling in interpreter if the counters exceed tier 3" \
3449 "thresholds by the specified percentage") \
3450 \
3451 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3452 "Increase the compile threshold for C1 compilation if the code" \
3453 "cache is filled by the specified percentage.") \
3454 \
3455 product(intx, TieredRateUpdateMinTime, 1, \
3456 "Minimum rate sampling interval (in milliseconds)") \
3457 \
3458 product(intx, TieredRateUpdateMaxTime, 25, \
3459 "Maximum rate sampling interval (in milliseconds)") \
3460 \
3461 product_pd(bool, TieredCompilation, \
3462 "Enable tiered compilation") \
3463 \
3464 product(bool, PrintTieredEvents, false, \
3465 "Print tiered events notifications") \
3466 \
3467 product_pd(intx, OnStackReplacePercentage, \
3468 "NON_TIERED number of method invocations/branches (expressed as %"\
3469 "of CompileThreshold) before (re-)compiling OSR code") \
3470 \
3471 product(intx, InterpreterProfilePercentage, 33, \
3472 "NON_TIERED number of method invocations/branches (expressed as %"\
3473 "of CompileThreshold) before profiling in the interpreter") \
3474 \
3475 develop(intx, MaxRecompilationSearchLength, 10, \
3476 "max. # frames to inspect searching for recompilee") \
3477 \
3478 develop(intx, MaxInterpretedSearchLength, 3, \
3479 "max. # interp. frames to skip when searching for recompilee") \
3480 \
3481 develop(intx, DesiredMethodLimit, 8000, \
3482 "desired max. method size (in bytecodes) after inlining") \
3483 \
3484 develop(intx, HugeMethodLimit, 8000, \
3485 "don't compile methods larger than this if " \
3486 "+DontCompileHugeMethods") \
3487 \
3488 /* New JDK 1.4 reflection implementation */ \
3489 \
3490 develop(bool, UseNewReflection, true, \
3491 "Temporary flag for transition to reflection based on dynamic " \
3492 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3493 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3494 "changes were needed") \
3495 \
3496 develop(bool, VerifyReflectionBytecodes, false, \
3497 "Force verification of 1.4 reflection bytecodes. Does not work " \
3498 "in situations like that described in 4486457 or for " \
3499 "constructors generated for serialization, so can not be enabled "\
3500 "in product.") \
3501 \
3502 product(bool, ReflectionWrapResolutionErrors, true, \
3503 "Temporary flag for transition to AbstractMethodError wrapped " \
3504 "in InvocationTargetException. See 6531596") \
3505 \
3506 \
3507 develop(intx, FastSuperclassLimit, 8, \
3508 "Depth of hardwired instanceof accelerator array") \
3509 \
3510 /* Properties for Java libraries */ \
3511 \
3512 product(uintx, MaxDirectMemorySize, 0, \
3513 "Maximum total size of NIO direct-buffer allocations") \
3514 \
3515 /* temporary developer defined flags */ \
3516 \
3517 diagnostic(bool, UseNewCode, false, \
3518 "Testing Only: Use the new version while testing") \
3519 \
3520 diagnostic(bool, UseNewCode2, false, \
3521 "Testing Only: Use the new version while testing") \
3522 \
3523 diagnostic(bool, UseNewCode3, false, \
3524 "Testing Only: Use the new version while testing") \
3525 \
3526 /* flags for performance data collection */ \
3527 \
3528 product(bool, UsePerfData, falseInEmbedded, \
3529 "Flag to disable jvmstat instrumentation for performance testing" \
3530 "and problem isolation purposes.") \
3531 \
3532 product(bool, PerfDataSaveToFile, false, \
3533 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3534 \
3535 product(ccstr, PerfDataSaveFile, NULL, \
3536 "Save PerfData memory to the specified absolute pathname," \
3537 "%p in the file name if present will be replaced by pid") \
3538 \
3539 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3540 "Data sampling interval in milliseconds") \
3541 \
3542 develop(bool, PerfTraceDataCreation, false, \
3543 "Trace creation of Performance Data Entries") \
3544 \
3545 develop(bool, PerfTraceMemOps, false, \
3546 "Trace PerfMemory create/attach/detach calls") \
3547 \
3548 product(bool, PerfDisableSharedMem, false, \
3549 "Store performance data in standard memory") \
3550 \
3551 product(intx, PerfDataMemorySize, 32*K, \
3552 "Size of performance data memory region. Will be rounded " \
3553 "up to a multiple of the native os page size.") \
3554 \
3555 product(intx, PerfMaxStringConstLength, 1024, \
3556 "Maximum PerfStringConstant string length before truncation") \
3557 \
3558 product(bool, PerfAllowAtExitRegistration, false, \
3559 "Allow registration of atexit() methods") \
3560 \
3561 product(bool, PerfBypassFileSystemCheck, false, \
3562 "Bypass Win32 file system criteria checks (Windows Only)") \
3563 \
3564 product(intx, UnguardOnExecutionViolation, 0, \
3565 "Unguard page and retry on no-execute fault (Win32 only)" \
3566 "0=off, 1=conservative, 2=aggressive") \
3567 \
3568 /* Serviceability Support */ \
3569 \
3570 product(bool, ManagementServer, false, \
3571 "Create JMX Management Server") \
3572 \
3573 product(bool, DisableAttachMechanism, false, \
3574 "Disable mechanism that allows tools to attach to this VM") \
3575 \
3576 product(bool, StartAttachListener, false, \
3577 "Always start Attach Listener at VM startup") \
3578 \
3579 manageable(bool, PrintConcurrentLocks, false, \
3580 "Print java.util.concurrent locks in thread dump") \
3581 \
3582 product(bool, TransmitErrorReport, false, \
3583 "Enable error report transmission on erroneous termination") \
3584 \
3585 product(ccstr, ErrorReportServer, NULL, \
3586 "Override built-in error report server address") \
3587 \
3588 /* Shared spaces */ \
3589 \
3590 product(bool, UseSharedSpaces, true, \
3591 "Use shared spaces for metadata") \
3592 \
3593 product(bool, RequireSharedSpaces, false, \
3594 "Require shared spaces for metadata") \
3595 \
3596 product(bool, DumpSharedSpaces, false, \
3597 "Special mode: JVM reads a class list, loads classes, builds " \
3598 "shared spaces, and dumps the shared spaces to a file to be " \
3599 "used in future JVM runs.") \
3600 \
3601 product(bool, PrintSharedSpaces, false, \
3602 "Print usage of shared spaces") \
3603 \
3604 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3605 "Size of read-write space for metadata (in bytes)") \
3606 \
3607 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3608 "Size of read-only space for metadata (in bytes)") \
3609 \
3610 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3611 "Size of the shared miscellaneous data area (in bytes)") \
3612 \
3613 product(uintx, SharedMiscCodeSize, 120*K, \
3614 "Size of the shared miscellaneous code area (in bytes)") \
3615 \
3616 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3617 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3618 "Address to allocate shared memory region for class data") \
3619 \
3620 diagnostic(bool, EnableInvokeDynamic, true PPC64_ONLY(&& false), \
3621 "support JSR 292 (method handles, invokedynamic, " \
3622 "anonymous classes") \
3623 \
3624 diagnostic(bool, PrintMethodHandleStubs, false, \
3625 "Print generated stub code for method handles") \
3626 \
3627 develop(bool, TraceMethodHandles, false, \
3628 "trace internal method handle operations") \
3629 \
3630 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3631 "perform extra checks when constructing method handles") \
3632 \
3633 diagnostic(bool, ShowHiddenFrames, false, \
3634 "show method handle implementation frames (usually hidden)") \
3635 \
3636 experimental(bool, TrustFinalNonStaticFields, false, \
3637 "trust final non-static declarations for constant folding") \
3638 \
3639 develop(bool, TraceInvokeDynamic, false, \
3640 "trace internal invoke dynamic operations") \
3641 \
3642 diagnostic(bool, PauseAtStartup, false, \
3643 "Causes the VM to pause at startup time and wait for the pause " \
3644 "file to be removed (default: ./vm.paused.<pid>)") \
3645 \
3646 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3647 "The file to create and for whose removal to await when pausing " \
3648 "at startup. (default: ./vm.paused.<pid>)") \
3649 \
3650 diagnostic(bool, PauseAtExit, false, \
3651 "Pause and wait for keypress on exit if a debugger is attached") \
3652 \
3653 product(bool, ExtendedDTraceProbes, false, \
3654 "Enable performance-impacting dtrace probes") \
3655 \
3656 product(bool, DTraceMethodProbes, false, \
3657 "Enable dtrace probes for method-entry and method-exit") \
3658 \
3659 product(bool, DTraceAllocProbes, false, \
3660 "Enable dtrace probes for object allocation") \
3661 \
3662 product(bool, DTraceMonitorProbes, false, \
3663 "Enable dtrace probes for monitor events") \
3664 \
3665 product(bool, RelaxAccessControlCheck, false, \
3666 "Relax the access control checks in the verifier") \
3667 \
3668 diagnostic(bool, PrintDTraceDOF, false, \
3669 "Print the DTrace DOF passed to the system for JSDT probes") \
3670 \
3671 product(uintx, StringTableSize, defaultStringTableSize, \
3672 "Number of buckets in the interned String table") \
3673 \
3674 develop(bool, TraceDefaultMethods, false, \
3675 "Trace the default method processing steps") \
3676 \
3677 develop(bool, ParseAllGenericSignatures, false, \
3678 "Parse all generic signatures while classloading") \
3679 \
3680 develop(bool, VerifyGenericSignatures, false, \
3681 "Abort VM on erroneous or inconsistent generic signatures") \
3682 \
3683 product(bool, ParseGenericDefaults, false, \
3684 "Parse generic signatures for default method handling") \
3685 \
3686 product(bool, UseVMInterruptibleIO, false, \
3687 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3688 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3689 " of this flag is true for JDK 6 and earlier") \
3690 \
3691 diagnostic(bool, WhiteBoxAPI, false, \
3692 "Enable internal testing APIs") \
3693 \
3694 product(bool, PrintGCCause, true, \
3695 "Include GC cause in GC logging") \
3696 \
3697 product(bool , AllowNonVirtualCalls, false, \
3698 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3699 \
3700 diagnostic(ccstr, SharedArchiveFile, NULL, \
3701 "Override the default location of the CDS archive file") \
3702 \
3703 experimental(uintx, ArrayAllocatorMallocLimit, \
3704 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3705 "Allocation less than this value will be allocated " \
3706 "using malloc. Larger allocations will use mmap.") \
3707 \
3708 product(bool, EnableTracing, false, \
3709 "Enable event-based tracing") \
3710 product(bool, UseLockedTracing, false, \
3711 "Use locked-tracing when doing event-based tracing")
3712
3713
3714 /*
3715 * Macros for factoring of globals
3716 */
3717
3718 // Interface macros
3719 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3720 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3721 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3722 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3723 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3724 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3725 #ifdef PRODUCT
3726 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3727 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3728 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3729 #else
3730 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3731 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3732 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3733 #endif
3734 // Special LP64 flags, product only needed for now.
3735 #ifdef _LP64
3736 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3737 #else
3738 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3739 #endif // _LP64
3740
3741 // Implementation macros
3742 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3743 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3744 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3745 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3746 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3747 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3748 #ifdef PRODUCT
3749 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3750 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3751 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3752 #else
3753 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3754 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3755 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3756 #endif
3757 #ifdef _LP64
3758 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3759 #else
3760 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3761 #endif // _LP64
3762
3763 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)
3764
3765 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3766
3767 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3768
3769 // Extensions
3770
3771 #include "runtime/globals_ext.hpp"
3772
3773 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP