1 /*
2 * Copyright (c) 1997, 2011, 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 #ifdef TARGET_ARCH_x86
30 # include "globals_x86.hpp"
31 #endif
32 #ifdef TARGET_ARCH_sparc
33 # include "globals_sparc.hpp"
34 #endif
35 #ifdef TARGET_ARCH_zero
36 # include "globals_zero.hpp"
37 #endif
38 #ifdef TARGET_ARCH_arm
39 # include "globals_arm.hpp"
40 #endif
41 #ifdef TARGET_ARCH_ppc
42 # include "globals_ppc.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "globals_linux.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "globals_solaris.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "globals_windows.hpp"
52 #endif
53 #ifdef TARGET_OS_ARCH_linux_x86
54 # include "globals_linux_x86.hpp"
55 #endif
56 #ifdef TARGET_OS_ARCH_linux_sparc
57 # include "globals_linux_sparc.hpp"
58 #endif
59 #ifdef TARGET_OS_ARCH_linux_zero
60 # include "globals_linux_zero.hpp"
61 #endif
62 #ifdef TARGET_OS_ARCH_solaris_x86
63 # include "globals_solaris_x86.hpp"
64 #endif
65 #ifdef TARGET_OS_ARCH_solaris_sparc
66 # include "globals_solaris_sparc.hpp"
67 #endif
68 #ifdef TARGET_OS_ARCH_windows_x86
69 # include "globals_windows_x86.hpp"
70 #endif
71 #ifdef TARGET_OS_ARCH_linux_arm
72 # include "globals_linux_arm.hpp"
73 #endif
74 #ifdef TARGET_OS_ARCH_linux_ppc
75 # include "globals_linux_ppc.hpp"
76 #endif
77 #ifdef COMPILER1
78 #ifdef TARGET_ARCH_x86
79 # include "c1_globals_x86.hpp"
80 #endif
81 #ifdef TARGET_ARCH_sparc
82 # include "c1_globals_sparc.hpp"
83 #endif
84 #ifdef TARGET_ARCH_arm
85 # include "c1_globals_arm.hpp"
86 #endif
87 #ifdef TARGET_ARCH_ppc
88 # include "c1_globals_ppc.hpp"
89 #endif
90 #ifdef TARGET_OS_FAMILY_linux
91 # include "c1_globals_linux.hpp"
92 #endif
93 #ifdef TARGET_OS_FAMILY_solaris
94 # include "c1_globals_solaris.hpp"
95 #endif
96 #ifdef TARGET_OS_FAMILY_windows
97 # include "c1_globals_windows.hpp"
98 #endif
99 #endif
100 #ifdef COMPILER2
101 #ifdef TARGET_ARCH_x86
102 # include "c2_globals_x86.hpp"
103 #endif
104 #ifdef TARGET_ARCH_sparc
105 # include "c2_globals_sparc.hpp"
106 #endif
107 #ifdef TARGET_ARCH_arm
108 # include "c2_globals_arm.hpp"
109 #endif
110 #ifdef TARGET_OS_FAMILY_linux
111 # include "c2_globals_linux.hpp"
112 #endif
113 #ifdef TARGET_OS_FAMILY_solaris
114 # include "c2_globals_solaris.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_windows
117 # include "c2_globals_windows.hpp"
118 #endif
119 #endif
120 #ifdef SHARK
121 #ifdef TARGET_ARCH_zero
122 # include "shark_globals_zero.hpp"
123 #endif
124 #endif
125
126 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
127 define_pd_global(bool, BackgroundCompilation, false);
128 define_pd_global(bool, UseTLAB, false);
129 define_pd_global(bool, CICompileOSR, false);
130 define_pd_global(bool, UseTypeProfile, false);
131 define_pd_global(bool, UseOnStackReplacement, false);
132 define_pd_global(bool, InlineIntrinsics, false);
133 define_pd_global(bool, PreferInterpreterNativeStubs, true);
134 define_pd_global(bool, ProfileInterpreter, false);
135 define_pd_global(bool, ProfileTraps, false);
136 define_pd_global(bool, TieredCompilation, false);
137
138 define_pd_global(intx, CompileThreshold, 0);
139 define_pd_global(intx, BackEdgeThreshold, 0);
140
141 define_pd_global(intx, OnStackReplacePercentage, 0);
142 define_pd_global(bool, ResizeTLAB, false);
143 define_pd_global(intx, FreqInlineSize, 0);
144 define_pd_global(intx, InlineSmallCode, 0);
145 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
146 define_pd_global(intx, InlineClassNatives, true);
147 define_pd_global(intx, InlineUnsafeOps, true);
148 define_pd_global(intx, InitialCodeCacheSize, 160*K);
149 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
150 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
151 define_pd_global(intx, CodeCacheMinBlockLength, 1);
152 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
153 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
154 define_pd_global(bool, NeverActAsServerClassMachine, true);
155 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
156 #define CI_COMPILER_COUNT 0
157 #else
158
159 #ifdef COMPILER2
160 #define CI_COMPILER_COUNT 2
161 #else
162 #define CI_COMPILER_COUNT 1
163 #endif // COMPILER2
164
165 #endif // no compilers
166
167
168 // string type aliases used only in this file
169 typedef const char* ccstr;
170 typedef const char* ccstrlist; // represents string arguments which accumulate
171
172 enum FlagValueOrigin {
173 DEFAULT = 0,
174 COMMAND_LINE = 1,
175 ENVIRON_VAR = 2,
176 CONFIG_FILE = 3,
177 MANAGEMENT = 4,
178 ERGONOMIC = 5,
179 ATTACH_ON_DEMAND = 6,
180 INTERNAL = 99
181 };
182
183 struct Flag {
184 const char *type;
185 const char *name;
186 void* addr;
187
188 NOT_PRODUCT(const char *doc;)
189
190 const char *kind;
191 FlagValueOrigin origin;
192
193 // points to all Flags static array
194 static Flag *flags;
195
196 // number of flags
197 static size_t numFlags;
198
199 static Flag* find_flag(char* name, size_t length);
200
201 bool is_bool() const { return strcmp(type, "bool") == 0; }
202 bool get_bool() const { return *((bool*) addr); }
203 void set_bool(bool value) { *((bool*) addr) = value; }
204
205 bool is_intx() const { return strcmp(type, "intx") == 0; }
206 intx get_intx() const { return *((intx*) addr); }
207 void set_intx(intx value) { *((intx*) addr) = value; }
208
209 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
210 uintx get_uintx() const { return *((uintx*) addr); }
211 void set_uintx(uintx value) { *((uintx*) addr) = value; }
212
213 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
214 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
215 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
216
217 bool is_double() const { return strcmp(type, "double") == 0; }
218 double get_double() const { return *((double*) addr); }
219 void set_double(double value) { *((double*) addr) = value; }
220
221 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
222 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
223 ccstr get_ccstr() const { return *((ccstr*) addr); }
224 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
225
226 bool is_unlocker() const;
227 bool is_unlocked() const;
228 bool is_writeable() const;
229 bool is_external() const;
230
231 void print_on(outputStream* st, bool withComments = false );
232 void print_as_flag(outputStream* st);
233 };
234
235 // debug flags control various aspects of the VM and are global accessible
236
237 // use FlagSetting to temporarily change some debug flag
238 // e.g. FlagSetting fs(DebugThisAndThat, true);
239 // restored to previous value upon leaving scope
240 class FlagSetting {
241 bool val;
242 bool* flag;
243 public:
244 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
245 ~FlagSetting() { *flag = val; }
246 };
247
248
249 class CounterSetting {
250 intx* counter;
251 public:
252 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
253 ~CounterSetting() { (*counter)--; }
254 };
255
256
257 class IntFlagSetting {
258 intx val;
259 intx* flag;
260 public:
261 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
262 ~IntFlagSetting() { *flag = val; }
263 };
264
265
266 class DoubleFlagSetting {
267 double val;
268 double* flag;
269 public:
270 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
271 ~DoubleFlagSetting() { *flag = val; }
272 };
273
274
275 class CommandLineFlags {
276 public:
277 static bool boolAt(char* name, size_t len, bool* value);
278 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
279 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
280 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
281
282 static bool intxAt(char* name, size_t len, intx* value);
283 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
284 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
285 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
286
287 static bool uintxAt(char* name, size_t len, uintx* value);
288 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
289 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
290 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
291
292 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
293 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
294 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
295 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
296
297 static bool doubleAt(char* name, size_t len, double* value);
298 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
299 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
300 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
301
302 static bool ccstrAt(char* name, size_t len, ccstr* value);
303 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
304 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
305 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
306
307 // Returns false if name is not a command line flag.
308 static bool wasSetOnCmdline(const char* name, bool* value);
309 static void printSetFlags();
310
311 static void printFlags(bool withComments = false );
312
313 static void verify() PRODUCT_RETURN;
314 };
315
316 // use this for flags that are true by default in the debug version but
317 // false in the optimized version, and vice versa
318 #ifdef ASSERT
319 #define trueInDebug true
320 #define falseInDebug false
321 #else
322 #define trueInDebug false
323 #define falseInDebug true
324 #endif
325
326 // use this for flags that are true per default in the product build
327 // but false in development builds, and vice versa
328 #ifdef PRODUCT
329 #define trueInProduct true
330 #define falseInProduct false
331 #else
332 #define trueInProduct false
333 #define falseInProduct true
334 #endif
335
336 // use this for flags that are true per default in the tiered build
337 // but false in non-tiered builds, and vice versa
338 #ifdef TIERED
339 #define trueInTiered true
340 #define falseInTiered false
341 #else
342 #define trueInTiered false
343 #define falseInTiered true
344 #endif
345
346 // develop flags are settable / visible only during development and are constant in the PRODUCT version
347 // product flags are always settable / visible
348 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
349
350 // A flag must be declared with one of the following types:
351 // bool, intx, uintx, ccstr.
352 // The type "ccstr" is an alias for "const char*" and is used
353 // only in this file, because the macrology requires single-token type names.
354
355 // Note: Diagnostic options not meant for VM tuning or for product modes.
356 // They are to be used for VM quality assurance or field diagnosis
357 // of VM bugs. They are hidden so that users will not be encouraged to
358 // try them as if they were VM ordinary execution options. However, they
359 // are available in the product version of the VM. Under instruction
360 // from support engineers, VM customers can turn them on to collect
361 // diagnostic information about VM problems. To use a VM diagnostic
362 // option, you must first specify +UnlockDiagnosticVMOptions.
363 // (This master switch also affects the behavior of -Xprintflags.)
364 //
365 // experimental flags are in support of features that are not
366 // part of the officially supported product, but are available
367 // for experimenting with. They could, for example, be performance
368 // features that may not have undergone full or rigorous QA, but which may
369 // help performance in some cases and released for experimentation
370 // by the community of users and developers. This flag also allows one to
371 // be able to build a fully supported product that nonetheless also
372 // ships with some unsupported, lightly tested, experimental features.
373 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
374 // UnlockExperimentalVMOptions flag, which allows the control and
375 // modification of the experimental flags.
376 //
377 // Nota bene: neither diagnostic nor experimental options should be used casually,
378 // and they are not supported on production loads, except under explicit
379 // direction from support engineers.
380 //
381 // manageable flags are writeable external product flags.
382 // They are dynamically writeable through the JDK management interface
383 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
384 // These flags are external exported interface (see CCC). The list of
385 // manageable flags can be queried programmatically through the management
386 // interface.
387 //
388 // A flag can be made as "manageable" only if
389 // - the flag is defined in a CCC as an external exported interface.
390 // - the VM implementation supports dynamic setting of the flag.
391 // This implies that the VM must *always* query the flag variable
392 // and not reuse state related to the flag state at any given time.
393 // - you want the flag to be queried programmatically by the customers.
394 //
395 // product_rw flags are writeable internal product flags.
396 // They are like "manageable" flags but for internal/private use.
397 // The list of product_rw flags are internal/private flags which
398 // may be changed/removed in a future release. It can be set
399 // through the management interface to get/set value
400 // when the name of flag is supplied.
401 //
402 // A flag can be made as "product_rw" only if
403 // - the VM implementation supports dynamic setting of the flag.
404 // This implies that the VM must *always* query the flag variable
405 // and not reuse state related to the flag state at any given time.
406 //
407 // Note that when there is a need to support develop flags to be writeable,
408 // it can be done in the same way as product_rw.
409
410 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
411 \
412 lp64_product(bool, UseCompressedOops, false, \
413 "Use 32-bit object references in 64-bit VM. " \
414 "lp64_product means flag is always constant in 32 bit VM") \
415 \
416 notproduct(bool, CheckCompressedOops, true, \
417 "generate checks in encoding/decoding code in debug VM") \
418 \
419 product_pd(uintx, HeapBaseMinAddress, \
420 "OS specific low limit for heap base address") \
421 \
422 diagnostic(bool, PrintCompressedOopsMode, false, \
423 "Print compressed oops base address and encoding mode") \
424 \
425 lp64_product(intx, ObjectAlignmentInBytes, 8, \
426 "Default object alignment in bytes, 8 is minimum") \
427 \
428 /* UseMembar is theoretically a temp flag used for memory barrier \
429 * removal testing. It was supposed to be removed before FCS but has \
430 * been re-added (see 6401008) */ \
431 product_pd(bool, UseMembar, \
432 "(Unstable) Issues membars on thread state transitions") \
433 \
434 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
435 * that don't support it. This will be replaced by processor detection \
436 * logic. \
437 */ \
438 product(bool, UsePPCLWSYNC, true, \
439 "Use lwsync instruction if true, else use slower sync") \
440 \
441 /* Temporary: See 6948537 */ \
442 experimental(bool, UseMemSetInBOT, true, \
443 "(Unstable) uses memset in BOT updates in GC code") \
444 \
445 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
446 "Enable normal processing of flags relating to field diagnostics")\
447 \
448 experimental(bool, UnlockExperimentalVMOptions, false, \
449 "Enable normal processing of flags relating to experimental features")\
450 \
451 product(bool, JavaMonitorsInStackTrace, true, \
452 "Print info. about Java monitor locks when the stacks are dumped")\
453 \
454 product_pd(bool, UseLargePages, \
455 "Use large page memory") \
456 \
457 product_pd(bool, UseLargePagesIndividualAllocation, \
458 "Allocate large pages individually for better affinity") \
459 \
460 develop(bool, LargePagesIndividualAllocationInjectError, false, \
461 "Fail large pages individual allocation") \
462 \
463 develop(bool, TracePageSizes, false, \
464 "Trace page size selection and usage.") \
465 \
466 product(bool, UseNUMA, false, \
467 "Use NUMA if available") \
468 \
469 product(bool, ForceNUMA, false, \
470 "Force NUMA optimizations on single-node/UMA systems") \
471 \
472 product(intx, NUMAChunkResizeWeight, 20, \
473 "Percentage (0-100) used to weight the current sample when " \
474 "computing exponentially decaying average for " \
475 "AdaptiveNUMAChunkSizing") \
476 \
477 product(intx, NUMASpaceResizeRate, 1*G, \
478 "Do not reallocate more that this amount per collection") \
479 \
480 product(bool, UseAdaptiveNUMAChunkSizing, true, \
481 "Enable adaptive chunk sizing for NUMA") \
482 \
483 product(bool, NUMAStats, false, \
484 "Print NUMA stats in detailed heap information") \
485 \
486 product(intx, NUMAPageScanRate, 256, \
487 "Maximum number of pages to include in the page scan procedure") \
488 \
489 product_pd(bool, NeedsDeoptSuspend, \
490 "True for register window machines (sparc/ia64)") \
491 \
492 product(intx, UseSSE, 99, \
493 "Highest supported SSE instructions set on x86/x64") \
494 \
495 product(uintx, LargePageSizeInBytes, 0, \
496 "Large page size (0 to let VM choose the page size") \
497 \
498 product(uintx, LargePageHeapSizeThreshold, 128*M, \
499 "Use large pages if max heap is at least this big") \
500 \
501 product(bool, ForceTimeHighResolution, false, \
502 "Using high time resolution(For Win32 only)") \
503 \
504 develop(bool, TraceItables, false, \
505 "Trace initialization and use of itables") \
506 \
507 develop(bool, TracePcPatching, false, \
508 "Trace usage of frame::patch_pc") \
509 \
510 develop(bool, TraceJumps, false, \
511 "Trace assembly jumps in thread ring buffer") \
512 \
513 develop(bool, TraceRelocator, false, \
514 "Trace the bytecode relocator") \
515 \
516 develop(bool, TraceLongCompiles, false, \
517 "Print out every time compilation is longer than " \
518 "a given threashold") \
519 \
520 develop(bool, SafepointALot, false, \
521 "Generates a lot of safepoints. Works with " \
522 "GuaranteedSafepointInterval") \
523 \
524 product_pd(bool, BackgroundCompilation, \
525 "A thread requesting compilation is not blocked during " \
526 "compilation") \
527 \
528 product(bool, PrintVMQWaitTime, false, \
529 "Prints out the waiting time in VM operation queue") \
530 \
531 develop(bool, BailoutToInterpreterForThrows, false, \
532 "Compiled methods which throws/catches exceptions will be " \
533 "deopt and intp.") \
534 \
535 develop(bool, NoYieldsInMicrolock, false, \
536 "Disable yields in microlock") \
537 \
538 develop(bool, TraceOopMapGeneration, false, \
539 "Shows oopmap generation") \
540 \
541 product(bool, MethodFlushing, true, \
542 "Reclamation of zombie and not-entrant methods") \
543 \
544 develop(bool, VerifyStack, false, \
545 "Verify stack of each thread when it is entering a runtime call") \
546 \
547 develop(bool, ForceUnreachable, false, \
548 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
549 \
550 notproduct(bool, StressDerivedPointers, false, \
551 "Force scavenge when a derived pointers is detected on stack " \
552 "after rtm call") \
553 \
554 develop(bool, TraceDerivedPointers, false, \
555 "Trace traversal of derived pointers on stack") \
556 \
557 notproduct(bool, TraceCodeBlobStacks, false, \
558 "Trace stack-walk of codeblobs") \
559 \
560 product(bool, PrintJNIResolving, false, \
561 "Used to implement -v:jni") \
562 \
563 notproduct(bool, PrintRewrites, false, \
564 "Print methods that are being rewritten") \
565 \
566 product(bool, UseInlineCaches, true, \
567 "Use Inline Caches for virtual calls ") \
568 \
569 develop(bool, InlineArrayCopy, true, \
570 "inline arraycopy native that is known to be part of " \
571 "base library DLL") \
572 \
573 develop(bool, InlineObjectHash, true, \
574 "inline Object::hashCode() native that is known to be part " \
575 "of base library DLL") \
576 \
577 develop(bool, InlineObjectCopy, true, \
578 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
579 \
580 develop(bool, InlineNatives, true, \
581 "inline natives that are known to be part of base library DLL") \
582 \
583 develop(bool, InlineMathNatives, true, \
584 "inline SinD, CosD, etc.") \
585 \
586 develop(bool, InlineClassNatives, true, \
587 "inline Class.isInstance, etc") \
588 \
589 develop(bool, InlineAtomicLong, true, \
590 "inline sun.misc.AtomicLong") \
591 \
592 develop(bool, InlineThreadNatives, true, \
593 "inline Thread.currentThread, etc") \
594 \
595 develop(bool, InlineReflectionGetCallerClass, true, \
596 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
597 "of base library DLL") \
598 \
599 develop(bool, InlineUnsafeOps, true, \
600 "inline memory ops (native methods) from sun.misc.Unsafe") \
601 \
602 develop(bool, ConvertCmpD2CmpF, true, \
603 "Convert cmpD to cmpF when one input is constant in float range") \
604 \
605 develop(bool, ConvertFloat2IntClipping, true, \
606 "Convert float2int clipping idiom to integer clipping") \
607 \
608 develop(bool, SpecialStringCompareTo, true, \
609 "special version of string compareTo") \
610 \
611 develop(bool, SpecialStringIndexOf, true, \
612 "special version of string indexOf") \
613 \
614 develop(bool, SpecialStringEquals, true, \
615 "special version of string equals") \
616 \
617 develop(bool, SpecialArraysEquals, true, \
618 "special version of Arrays.equals(char[],char[])") \
619 \
620 product(bool, UseSSE42Intrinsics, false, \
621 "SSE4.2 versions of intrinsics") \
622 \
623 develop(bool, TraceCallFixup, false, \
624 "traces all call fixups") \
625 \
626 develop(bool, DeoptimizeALot, false, \
627 "deoptimize at every exit from the runtime system") \
628 \
629 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
630 "a comma separated list of bcis to deoptimize at") \
631 \
632 product(bool, DeoptimizeRandom, false, \
633 "deoptimize random frames on random exit from the runtime system")\
634 \
635 notproduct(bool, ZombieALot, false, \
636 "creates zombies (non-entrant) at exit from the runt. system") \
637 \
638 product(bool, UnlinkSymbolsALot, false, \
639 "unlink unreferenced symbols from the symbol table at safepoints")\
640 \
641 notproduct(bool, WalkStackALot, false, \
642 "trace stack (no print) at every exit from the runtime system") \
643 \
644 develop(bool, Debugging, false, \
645 "set when executing debug methods in debug.ccp " \
646 "(to prevent triggering assertions)") \
647 \
648 notproduct(bool, StrictSafepointChecks, trueInDebug, \
649 "Enable strict checks that safepoints cannot happen for threads " \
650 "that used No_Safepoint_Verifier") \
651 \
652 notproduct(bool, VerifyLastFrame, false, \
653 "Verify oops on last frame on entry to VM") \
654 \
655 develop(bool, TraceHandleAllocation, false, \
656 "Prints out warnings when suspicious many handles are allocated") \
657 \
658 product(bool, UseCompilerSafepoints, true, \
659 "Stop at safepoints in compiled code") \
660 \
661 product(bool, UseSplitVerifier, true, \
662 "use split verifier with StackMapTable attributes") \
663 \
664 product(bool, FailOverToOldVerifier, true, \
665 "fail over to old verifier when split verifier fails") \
666 \
667 develop(bool, ShowSafepointMsgs, false, \
668 "Show msg. about safepoint synch.") \
669 \
670 product(bool, SafepointTimeout, false, \
671 "Time out and warn or fail after SafepointTimeoutDelay " \
672 "milliseconds if failed to reach safepoint") \
673 \
674 develop(bool, DieOnSafepointTimeout, false, \
675 "Die upon failure to reach safepoint (see SafepointTimeout)") \
676 \
677 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
678 /* typically, at most a few retries are needed */ \
679 product(intx, SuspendRetryCount, 50, \
680 "Maximum retry count for an external suspend request") \
681 \
682 product(intx, SuspendRetryDelay, 5, \
683 "Milliseconds to delay per retry (* current_retry_count)") \
684 \
685 product(bool, AssertOnSuspendWaitFailure, false, \
686 "Assert/Guarantee on external suspend wait failure") \
687 \
688 product(bool, TraceSuspendWaitFailures, false, \
689 "Trace external suspend wait failures") \
690 \
691 product(bool, MaxFDLimit, true, \
692 "Bump the number of file descriptors to max in solaris.") \
693 \
694 notproduct(bool, LogEvents, trueInDebug, \
695 "Enable Event log") \
696 \
697 product(bool, BytecodeVerificationRemote, true, \
698 "Enables the Java bytecode verifier for remote classes") \
699 \
700 product(bool, BytecodeVerificationLocal, false, \
701 "Enables the Java bytecode verifier for local classes") \
702 \
703 develop(bool, ForceFloatExceptions, trueInDebug, \
704 "Force exceptions on FP stack under/overflow") \
705 \
706 develop(bool, SoftMatchFailure, trueInProduct, \
707 "If the DFA fails to match a node, print a message and bail out") \
708 \
709 develop(bool, VerifyStackAtCalls, false, \
710 "Verify that the stack pointer is unchanged after calls") \
711 \
712 develop(bool, TraceJavaAssertions, false, \
713 "Trace java language assertions") \
714 \
715 notproduct(bool, CheckAssertionStatusDirectives, false, \
716 "temporary - see javaClasses.cpp") \
717 \
718 notproduct(bool, PrintMallocFree, false, \
719 "Trace calls to C heap malloc/free allocation") \
720 \
721 product(bool, PrintOopAddress, false, \
722 "Always print the location of the oop") \
723 \
724 notproduct(bool, VerifyCodeCacheOften, false, \
725 "Verify compiled-code cache often") \
726 \
727 develop(bool, ZapDeadCompiledLocals, false, \
728 "Zap dead locals in compiler frames") \
729 \
730 notproduct(bool, ZapDeadLocalsOld, false, \
731 "Zap dead locals (old version, zaps all frames when " \
732 "entering the VM") \
733 \
734 notproduct(bool, CheckOopishValues, false, \
735 "Warn if value contains oop ( requires ZapDeadLocals)") \
736 \
737 develop(bool, UseMallocOnly, false, \
738 "use only malloc/free for allocation (no resource area/arena)") \
739 \
740 develop(bool, PrintMalloc, false, \
741 "print all malloc/free calls") \
742 \
743 develop(bool, PrintMallocStatistics, false, \
744 "print malloc/free statistics") \
745 \
746 develop(bool, ZapResourceArea, trueInDebug, \
747 "Zap freed resource/arena space with 0xABABABAB") \
748 \
749 notproduct(bool, ZapVMHandleArea, trueInDebug, \
750 "Zap freed VM handle space with 0xBCBCBCBC") \
751 \
752 develop(bool, ZapJNIHandleArea, trueInDebug, \
753 "Zap freed JNI handle space with 0xFEFEFEFE") \
754 \
755 notproduct(bool, ZapStackSegments, trueInDebug, \
756 "Zap allocated/freed Stack segments with 0xFADFADED") \
757 \
758 develop(bool, ZapUnusedHeapArea, trueInDebug, \
759 "Zap unused heap space with 0xBAADBABE") \
760 \
761 develop(bool, TraceZapUnusedHeapArea, false, \
762 "Trace zapping of unused heap space") \
763 \
764 develop(bool, CheckZapUnusedHeapArea, false, \
765 "Check zapping of unused heap space") \
766 \
767 develop(bool, ZapFillerObjects, trueInDebug, \
768 "Zap filler objects with 0xDEAFBABE") \
769 \
770 develop(bool, PrintVMMessages, true, \
771 "Print vm messages on console") \
772 \
773 product(bool, PrintGCApplicationConcurrentTime, false, \
774 "Print the time the application has been running") \
775 \
776 product(bool, PrintGCApplicationStoppedTime, false, \
777 "Print the time the application has been stopped") \
778 \
779 notproduct(uintx, ErrorHandlerTest, 0, \
780 "If > 0, provokes an error after VM initialization; the value" \
781 "determines which error to provoke. See test_error_handler()" \
782 "in debug.cpp.") \
783 \
784 develop(bool, Verbose, false, \
785 "Prints additional debugging information from other modes") \
786 \
787 develop(bool, PrintMiscellaneous, false, \
788 "Prints uncategorized debugging information (requires +Verbose)") \
789 \
790 develop(bool, WizardMode, false, \
791 "Prints much more debugging information") \
792 \
793 product(bool, ShowMessageBoxOnError, false, \
794 "Keep process alive on VM fatal error") \
795 \
796 product(bool, CreateMinidumpOnCrash, false, \
797 "Create minidump on VM fatal error") \
798 \
799 product_pd(bool, UseOSErrorReporting, \
800 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
801 \
802 product(bool, SuppressFatalErrorMessage, false, \
803 "Do NO Fatal Error report [Avoid deadlock]") \
804 \
805 product(ccstrlist, OnError, "", \
806 "Run user-defined commands on fatal error; see VMError.cpp " \
807 "for examples") \
808 \
809 product(ccstrlist, OnOutOfMemoryError, "", \
810 "Run user-defined commands on first java.lang.OutOfMemoryError") \
811 \
812 manageable(bool, HeapDumpBeforeFullGC, false, \
813 "Dump heap to file before any major stop-world GC") \
814 \
815 manageable(bool, HeapDumpAfterFullGC, false, \
816 "Dump heap to file after any major stop-world GC") \
817 \
818 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
819 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
820 \
821 manageable(ccstr, HeapDumpPath, NULL, \
822 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
823 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
824 "in the working directory)") \
825 \
826 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
827 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
828 "when the heap usage is larger than this") \
829 \
830 develop(uintx, HeapDumpSegmentSize, 1*G, \
831 "Approximate segment size when generating a segmented heap dump") \
832 \
833 develop(bool, BreakAtWarning, false, \
834 "Execute breakpoint upon encountering VM warning") \
835 \
836 product_pd(bool, UseVectoredExceptions, \
837 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
838 \
839 develop(bool, TraceVMOperation, false, \
840 "Trace vm operations") \
841 \
842 develop(bool, UseFakeTimers, false, \
843 "Tells whether the VM should use system time or a fake timer") \
844 \
845 diagnostic(bool, LogCompilation, false, \
846 "Log compilation activity in detail to hotspot.log or LogFile") \
847 \
848 product(bool, PrintCompilation, false, \
849 "Print compilations") \
850 \
851 diagnostic(bool, TraceNMethodInstalls, false, \
852 "Trace nmethod intallation") \
853 \
854 diagnostic(intx, ScavengeRootsInCode, 0, \
855 "0: do not allow scavengable oops in the code cache; " \
856 "1: allow scavenging from the code cache; " \
857 "2: emit as many constants as the compiler can see") \
858 \
859 diagnostic(bool, TraceOSRBreakpoint, false, \
860 "Trace OSR Breakpoint ") \
861 \
862 diagnostic(bool, TraceCompileTriggered, false, \
863 "Trace compile triggered") \
864 \
865 diagnostic(bool, TraceTriggers, false, \
866 "Trace triggers") \
867 \
868 product(bool, AlwaysRestoreFPU, false, \
869 "Restore the FPU control word after every JNI call (expensive)") \
870 \
871 notproduct(bool, PrintCompilation2, false, \
872 "Print additional statistics per compilation") \
873 \
874 diagnostic(bool, PrintAdapterHandlers, false, \
875 "Print code generated for i2c/c2i adapters") \
876 \
877 develop(bool, VerifyAdapterSharing, false, \
878 "Verify that the code for shared adapters is the equivalent") \
879 \
880 diagnostic(bool, PrintAssembly, false, \
881 "Print assembly code (using external disassembler.so)") \
882 \
883 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
884 "Options string passed to disassembler.so") \
885 \
886 diagnostic(bool, PrintNMethods, false, \
887 "Print assembly code for nmethods when generated") \
888 \
889 diagnostic(bool, PrintNativeNMethods, false, \
890 "Print assembly code for native nmethods when generated") \
891 \
892 develop(bool, PrintDebugInfo, false, \
893 "Print debug information for all nmethods when generated") \
894 \
895 develop(bool, PrintRelocations, false, \
896 "Print relocation information for all nmethods when generated") \
897 \
898 develop(bool, PrintDependencies, false, \
899 "Print dependency information for all nmethods when generated") \
900 \
901 develop(bool, PrintExceptionHandlers, false, \
902 "Print exception handler tables for all nmethods when generated") \
903 \
904 develop(bool, InterceptOSException, false, \
905 "Starts debugger when an implicit OS (e.g., NULL) " \
906 "exception happens") \
907 \
908 notproduct(bool, PrintCodeCache, false, \
909 "Print the compiled_code cache when exiting") \
910 \
911 develop(bool, PrintCodeCache2, false, \
912 "Print detailed info on the compiled_code cache when exiting") \
913 \
914 diagnostic(bool, PrintStubCode, false, \
915 "Print generated stub code") \
916 \
917 product(bool, StackTraceInThrowable, true, \
918 "Collect backtrace in throwable when exception happens") \
919 \
920 product(bool, OmitStackTraceInFastThrow, true, \
921 "Omit backtraces for some 'hot' exceptions in optimized code") \
922 \
923 product(bool, ProfilerPrintByteCodeStatistics, false, \
924 "Prints byte code statictics when dumping profiler output") \
925 \
926 product(bool, ProfilerRecordPC, false, \
927 "Collects tick for each 16 byte interval of compiled code") \
928 \
929 product(bool, ProfileVM, false, \
930 "Profiles ticks that fall within VM (either in the VM Thread " \
931 "or VM code called through stubs)") \
932 \
933 product(bool, ProfileIntervals, false, \
934 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
935 \
936 notproduct(bool, ProfilerCheckIntervals, false, \
937 "Collect and print info on spacing of profiler ticks") \
938 \
939 develop(bool, PrintJVMWarnings, false, \
940 "Prints warnings for unimplemented JVM functions") \
941 \
942 product(bool, PrintWarnings, true, \
943 "Prints JVM warnings to output stream") \
944 \
945 notproduct(uintx, WarnOnStalledSpinLock, 0, \
946 "Prints warnings for stalled SpinLocks") \
947 \
948 develop(bool, InitializeJavaLangSystem, true, \
949 "Initialize java.lang.System - turn off for individual " \
950 "method debugging") \
951 \
952 develop(bool, InitializeJavaLangString, true, \
953 "Initialize java.lang.String - turn off for individual " \
954 "method debugging") \
955 \
956 develop(bool, InitializeJavaLangExceptionsErrors, true, \
957 "Initialize various error and exception classes - turn off for " \
958 "individual method debugging") \
959 \
960 product(bool, RegisterFinalizersAtInit, true, \
961 "Register finalizable objects at end of Object.<init> or " \
962 "after allocation") \
963 \
964 develop(bool, RegisterReferences, true, \
965 "Tells whether the VM should register soft/weak/final/phantom " \
966 "references") \
967 \
968 develop(bool, IgnoreRewrites, false, \
969 "Supress rewrites of bytecodes in the oopmap generator. " \
970 "This is unsafe!") \
971 \
972 develop(bool, PrintCodeCacheExtension, false, \
973 "Print extension of code cache") \
974 \
975 develop(bool, UsePrivilegedStack, true, \
976 "Enable the security JVM functions") \
977 \
978 develop(bool, IEEEPrecision, true, \
979 "Enables IEEE precision (for INTEL only)") \
980 \
981 develop(bool, ProtectionDomainVerification, true, \
982 "Verifies protection domain before resolution in system " \
983 "dictionary") \
984 \
985 product(bool, ClassUnloading, true, \
986 "Do unloading of classes") \
987 \
988 diagnostic(bool, LinkWellKnownClasses, false, \
989 "Resolve a well known class as soon as its name is seen") \
990 \
991 develop(bool, DisableStartThread, false, \
992 "Disable starting of additional Java threads " \
993 "(for debugging only)") \
994 \
995 develop(bool, MemProfiling, false, \
996 "Write memory usage profiling to log file") \
997 \
998 notproduct(bool, PrintSystemDictionaryAtExit, false, \
999 "Prints the system dictionary at exit") \
1000 \
1001 diagnostic(bool, UnsyncloadClass, false, \
1002 "Unstable: VM calls loadClass unsynchronized. Custom " \
1003 "class loader must call VM synchronized for findClass " \
1004 "and defineClass.") \
1005 \
1006 product(bool, AlwaysLockClassLoader, false, \
1007 "Require the VM to acquire the class loader lock before calling " \
1008 "loadClass() even for class loaders registering " \
1009 "as parallel capable") \
1010 \
1011 product(bool, AllowParallelDefineClass, false, \
1012 "Allow parallel defineClass requests for class loaders " \
1013 "registering as parallel capable") \
1014 \
1015 product(bool, MustCallLoadClassInternal, false, \
1016 "Call loadClassInternal() rather than loadClass()") \
1017 \
1018 product_pd(bool, DontYieldALot, \
1019 "Throw away obvious excess yield calls (for SOLARIS only)") \
1020 \
1021 product_pd(bool, ConvertSleepToYield, \
1022 "Converts sleep(0) to thread yield " \
1023 "(may be off for SOLARIS to improve GUI)") \
1024 \
1025 product(bool, ConvertYieldToSleep, false, \
1026 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1027 "behavior (SOLARIS only)") \
1028 \
1029 product(bool, UseBoundThreads, true, \
1030 "Bind user level threads to kernel threads (for SOLARIS only)") \
1031 \
1032 develop(bool, UseDetachedThreads, true, \
1033 "Use detached threads that are recycled upon termination " \
1034 "(for SOLARIS only)") \
1035 \
1036 product(bool, UseLWPSynchronization, true, \
1037 "Use LWP-based instead of libthread-based synchronization " \
1038 "(SPARC only)") \
1039 \
1040 product(ccstr, SyncKnobs, NULL, \
1041 "(Unstable) Various monitor synchronization tunables") \
1042 \
1043 product(intx, EmitSync, 0, \
1044 "(Unsafe,Unstable) " \
1045 " Controls emission of inline sync fast-path code") \
1046 \
1047 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
1048 \
1049 product(intx, MonitorBound, 0, "Bound Monitor population") \
1050 \
1051 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1052 \
1053 product(intx, Atomics, 0, \
1054 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
1055 \
1056 product(intx, FenceInstruction, 0, \
1057 "(Unsafe,Unstable) Experimental") \
1058 \
1059 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1060 \
1061 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1062 \
1063 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1064 \
1065 product(intx, hashCode, 0, \
1066 "(Unstable) select hashCode generation algorithm" ) \
1067 \
1068 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1069 "(Unstable, Linux-specific)" \
1070 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1071 \
1072 product(bool, FilterSpuriousWakeups, true, \
1073 "Prevent spurious or premature wakeups from object.wait " \
1074 "(Solaris only)") \
1075 \
1076 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1077 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1078 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1079 \
1080 develop(bool, UsePthreads, false, \
1081 "Use pthread-based instead of libthread-based synchronization " \
1082 "(SPARC only)") \
1083 \
1084 product(bool, AdjustConcurrency, false, \
1085 "call thr_setconcurrency at thread create time to avoid " \
1086 "LWP starvation on MP systems (For Solaris Only)") \
1087 \
1088 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
1089 "Should the system attempt to update the compiler file when " \
1090 "an error occurs?") \
1091 \
1092 product(bool, ReduceSignalUsage, false, \
1093 "Reduce the use of OS signals in Java and/or the VM") \
1094 \
1095 notproduct(bool, ValidateMarkSweep, false, \
1096 "Do extra validation during MarkSweep collection") \
1097 \
1098 notproduct(bool, RecordMarkSweepCompaction, false, \
1099 "Enable GC-to-GC recording and querying of compaction during " \
1100 "MarkSweep") \
1101 \
1102 develop_pd(bool, ShareVtableStubs, \
1103 "Share vtable stubs (smaller code but worse branch prediction") \
1104 \
1105 develop(bool, LoadLineNumberTables, true, \
1106 "Tells whether the class file parser loads line number tables") \
1107 \
1108 develop(bool, LoadLocalVariableTables, true, \
1109 "Tells whether the class file parser loads local variable tables")\
1110 \
1111 develop(bool, LoadLocalVariableTypeTables, true, \
1112 "Tells whether the class file parser loads local variable type tables")\
1113 \
1114 product(bool, AllowUserSignalHandlers, false, \
1115 "Do not complain if the application installs signal handlers " \
1116 "(Solaris & Linux only)") \
1117 \
1118 product(bool, UseSignalChaining, true, \
1119 "Use signal-chaining to invoke signal handlers installed " \
1120 "by the application (Solaris & Linux only)") \
1121 \
1122 product(bool, UseAltSigs, false, \
1123 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1124 "internal signals (Solaris only)") \
1125 \
1126 product(bool, UseSpinning, false, \
1127 "Use spinning in monitor inflation and before entry") \
1128 \
1129 product(bool, PreSpinYield, false, \
1130 "Yield before inner spinning loop") \
1131 \
1132 product(bool, PostSpinYield, true, \
1133 "Yield after inner spinning loop") \
1134 \
1135 product(bool, AllowJNIEnvProxy, false, \
1136 "Allow JNIEnv proxies for jdbx") \
1137 \
1138 product(bool, JNIDetachReleasesMonitors, true, \
1139 "JNI DetachCurrentThread releases monitors owned by thread") \
1140 \
1141 product(bool, RestoreMXCSROnJNICalls, false, \
1142 "Restore MXCSR when returning from JNI calls") \
1143 \
1144 product(bool, CheckJNICalls, false, \
1145 "Verify all arguments to JNI calls") \
1146 \
1147 product(bool, UseFastJNIAccessors, true, \
1148 "Use optimized versions of Get<Primitive>Field") \
1149 \
1150 product(bool, EagerXrunInit, false, \
1151 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1152 " but not all -Xrun libraries may support the state of the VM at this time") \
1153 \
1154 product(bool, PreserveAllAnnotations, false, \
1155 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1156 \
1157 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1158 "Number of OutOfMemoryErrors preallocated with backtrace") \
1159 \
1160 product(bool, LazyBootClassLoader, true, \
1161 "Enable/disable lazy opening of boot class path entries") \
1162 \
1163 diagnostic(bool, UseIncDec, true, \
1164 "Use INC, DEC instructions on x86") \
1165 \
1166 product(bool, UseNewLongLShift, false, \
1167 "Use optimized bitwise shift left") \
1168 \
1169 product(bool, UseStoreImmI16, true, \
1170 "Use store immediate 16-bits value instruction on x86") \
1171 \
1172 product(bool, UseAddressNop, false, \
1173 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1174 \
1175 product(bool, UseXmmLoadAndClearUpper, true, \
1176 "Load low part of XMM register and clear upper part") \
1177 \
1178 product(bool, UseXmmRegToRegMoveAll, false, \
1179 "Copy all XMM register bits when moving value between registers") \
1180 \
1181 product(bool, UseXmmI2D, false, \
1182 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1183 \
1184 product(bool, UseXmmI2F, false, \
1185 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1186 \
1187 product(bool, UseXMMForArrayCopy, false, \
1188 "Use SSE2 MOVQ instruction for Arraycopy") \
1189 \
1190 product(bool, UseUnalignedLoadStores, false, \
1191 "Use SSE2 MOVDQU instruction for Arraycopy") \
1192 \
1193 product(intx, FieldsAllocationStyle, 1, \
1194 "0 - type based with oops first, 1 - with oops last, " \
1195 "2 - oops in super and sub classes are together") \
1196 \
1197 product(bool, CompactFields, true, \
1198 "Allocate nonstatic fields in gaps between previous fields") \
1199 \
1200 notproduct(bool, PrintCompactFieldsSavings, false, \
1201 "Print how many words were saved with CompactFields") \
1202 \
1203 product(bool, UseBiasedLocking, true, \
1204 "Enable biased locking in JVM") \
1205 \
1206 product(intx, BiasedLockingStartupDelay, 4000, \
1207 "Number of milliseconds to wait before enabling biased locking") \
1208 \
1209 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1210 "Print statistics of biased locking in JVM") \
1211 \
1212 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1213 "Threshold of number of revocations per type to try to " \
1214 "rebias all objects in the heap of that type") \
1215 \
1216 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1217 "Threshold of number of revocations per type to permanently " \
1218 "revoke biases of all objects in the heap of that type") \
1219 \
1220 product(intx, BiasedLockingDecayTime, 25000, \
1221 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1222 "type after previous bulk rebias") \
1223 \
1224 develop(bool, JavaObjectsInPerm, false, \
1225 "controls whether Classes and interned Strings are allocated" \
1226 "in perm. This purely intended to allow debugging issues" \
1227 "in production.") \
1228 \
1229 /* tracing */ \
1230 \
1231 notproduct(bool, TraceRuntimeCalls, false, \
1232 "Trace run-time calls") \
1233 \
1234 develop(bool, TraceJNICalls, false, \
1235 "Trace JNI calls") \
1236 \
1237 notproduct(bool, TraceJVMCalls, false, \
1238 "Trace JVM calls") \
1239 \
1240 product(ccstr, TraceJVMTI, NULL, \
1241 "Trace flags for JVMTI functions and events") \
1242 \
1243 /* This option can change an EMCP method into an obsolete method. */ \
1244 /* This can affect tests that except specific methods to be EMCP. */ \
1245 /* This option should be used with caution. */ \
1246 product(bool, StressLdcRewrite, false, \
1247 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1248 \
1249 product(intx, TraceRedefineClasses, 0, \
1250 "Trace level for JVMTI RedefineClasses") \
1251 \
1252 develop(bool, StressMethodComparator, false, \
1253 "run the MethodComparator on all loaded methods") \
1254 \
1255 /* change to false by default sometime after Mustang */ \
1256 product(bool, VerifyMergedCPBytecodes, true, \
1257 "Verify bytecodes after RedefineClasses constant pool merging") \
1258 \
1259 develop(bool, TraceJNIHandleAllocation, false, \
1260 "Trace allocation/deallocation of JNI handle blocks") \
1261 \
1262 develop(bool, TraceThreadEvents, false, \
1263 "Trace all thread events") \
1264 \
1265 develop(bool, TraceBytecodes, false, \
1266 "Trace bytecode execution") \
1267 \
1268 develop(bool, TraceClassInitialization, false, \
1269 "Trace class initialization") \
1270 \
1271 develop(bool, TraceExceptions, false, \
1272 "Trace exceptions") \
1273 \
1274 develop(bool, TraceICs, false, \
1275 "Trace inline cache changes") \
1276 \
1277 notproduct(bool, TraceInvocationCounterOverflow, false, \
1278 "Trace method invocation counter overflow") \
1279 \
1280 develop(bool, TraceInlineCacheClearing, false, \
1281 "Trace clearing of inline caches in nmethods") \
1282 \
1283 develop(bool, TraceDependencies, false, \
1284 "Trace dependencies") \
1285 \
1286 develop(bool, VerifyDependencies, trueInDebug, \
1287 "Exercise and verify the compilation dependency mechanism") \
1288 \
1289 develop(bool, TraceNewOopMapGeneration, false, \
1290 "Trace OopMapGeneration") \
1291 \
1292 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1293 "Trace OopMapGeneration: print detailed cell states") \
1294 \
1295 develop(bool, TimeOopMap, false, \
1296 "Time calls to GenerateOopMap::compute_map() in sum") \
1297 \
1298 develop(bool, TimeOopMap2, false, \
1299 "Time calls to GenerateOopMap::compute_map() individually") \
1300 \
1301 develop(bool, TraceMonitorMismatch, false, \
1302 "Trace monitor matching failures during OopMapGeneration") \
1303 \
1304 develop(bool, TraceOopMapRewrites, false, \
1305 "Trace rewritting of method oops during oop map generation") \
1306 \
1307 develop(bool, TraceSafepoint, false, \
1308 "Trace safepoint operations") \
1309 \
1310 develop(bool, TraceICBuffer, false, \
1311 "Trace usage of IC buffer") \
1312 \
1313 develop(bool, TraceCompiledIC, false, \
1314 "Trace changes of compiled IC") \
1315 \
1316 notproduct(bool, TraceZapDeadLocals, false, \
1317 "Trace zapping dead locals") \
1318 \
1319 develop(bool, TraceStartupTime, false, \
1320 "Trace setup time") \
1321 \
1322 product(ccstr, HPILibPath, NULL, \
1323 "Specify alternate path to HPI library") \
1324 \
1325 develop(bool, TraceProtectionDomainVerification, false, \
1326 "Trace protection domain verifcation") \
1327 \
1328 develop(bool, TraceClearedExceptions, false, \
1329 "Prints when an exception is forcibly cleared") \
1330 \
1331 product(bool, TraceClassResolution, false, \
1332 "Trace all constant pool resolutions (for debugging)") \
1333 \
1334 product(bool, TraceBiasedLocking, false, \
1335 "Trace biased locking in JVM") \
1336 \
1337 product(bool, TraceMonitorInflation, false, \
1338 "Trace monitor inflation in JVM") \
1339 \
1340 /* assembler */ \
1341 product(bool, Use486InstrsOnly, false, \
1342 "Use 80486 Compliant instruction subset") \
1343 \
1344 /* gc */ \
1345 \
1346 product(bool, UseSerialGC, false, \
1347 "Use the serial garbage collector") \
1348 \
1349 product(bool, UseG1GC, false, \
1350 "Use the Garbage-First garbage collector") \
1351 \
1352 product(bool, UseParallelGC, false, \
1353 "Use the Parallel Scavenge garbage collector") \
1354 \
1355 product(bool, UseParallelOldGC, false, \
1356 "Use the Parallel Old garbage collector") \
1357 \
1358 product(bool, UseParallelOldGCCompacting, true, \
1359 "In the Parallel Old garbage collector use parallel compaction") \
1360 \
1361 product(bool, UseParallelDensePrefixUpdate, true, \
1362 "In the Parallel Old garbage collector use parallel dense" \
1363 " prefix update") \
1364 \
1365 product(uintx, HeapMaximumCompactionInterval, 20, \
1366 "How often should we maximally compact the heap (not allowing " \
1367 "any dead space)") \
1368 \
1369 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1370 "The collection count for the first maximum compaction") \
1371 \
1372 product(bool, UseMaximumCompactionOnSystemGC, true, \
1373 "In the Parallel Old garbage collector maximum compaction for " \
1374 "a system GC") \
1375 \
1376 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1377 "The mean used by the par compact dead wood" \
1378 "limiter (a number between 0-100).") \
1379 \
1380 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1381 "The standard deviation used by the par compact dead wood" \
1382 "limiter (a number between 0-100).") \
1383 \
1384 product(bool, UseParallelOldGCDensePrefix, true, \
1385 "Use a dense prefix with the Parallel Old garbage collector") \
1386 \
1387 product(uintx, ParallelGCThreads, 0, \
1388 "Number of parallel threads parallel gc will use") \
1389 \
1390 develop(bool, ParallelOldGCSplitALot, false, \
1391 "Provoke splitting (copying data from a young gen space to" \
1392 "multiple destination spaces)") \
1393 \
1394 develop(uintx, ParallelOldGCSplitInterval, 3, \
1395 "How often to provoke splitting a young gen space") \
1396 \
1397 develop(bool, TraceRegionTasksQueuing, false, \
1398 "Trace the queuing of the region tasks") \
1399 \
1400 product(uintx, ConcGCThreads, 0, \
1401 "Number of threads concurrent gc will use") \
1402 \
1403 product(uintx, YoungPLABSize, 4096, \
1404 "Size of young gen promotion labs (in HeapWords)") \
1405 \
1406 product(uintx, OldPLABSize, 1024, \
1407 "Size of old gen promotion labs (in HeapWords)") \
1408 \
1409 product(uintx, GCTaskTimeStampEntries, 200, \
1410 "Number of time stamp entries per gc worker thread") \
1411 \
1412 product(bool, AlwaysTenure, false, \
1413 "Always tenure objects in eden. (ParallelGC only)") \
1414 \
1415 product(bool, NeverTenure, false, \
1416 "Never tenure objects in eden, May tenure on overflow " \
1417 "(ParallelGC only)") \
1418 \
1419 product(bool, ScavengeBeforeFullGC, true, \
1420 "Scavenge youngest generation before each full GC, " \
1421 "used with UseParallelGC") \
1422 \
1423 develop(bool, ScavengeWithObjectsInToSpace, false, \
1424 "Allow scavenges to occur when to_space contains objects.") \
1425 \
1426 product(bool, UseConcMarkSweepGC, false, \
1427 "Use Concurrent Mark-Sweep GC in the old generation") \
1428 \
1429 product(bool, ExplicitGCInvokesConcurrent, false, \
1430 "A System.gc() request invokes a concurrent collection;" \
1431 " (effective only when UseConcMarkSweepGC)") \
1432 \
1433 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1434 "A System.gc() request invokes a concurrent collection and " \
1435 "also unloads classes during such a concurrent gc cycle " \
1436 "(effective only when UseConcMarkSweepGC)") \
1437 \
1438 product(bool, GCLockerInvokesConcurrent, false, \
1439 "The exit of a JNI CS necessitating a scavenge also" \
1440 " kicks off a bkgrd concurrent collection") \
1441 \
1442 product(uintx, GCLockerEdenExpansionPercent, 5, \
1443 "How much the GC can expand the eden by while the GC locker " \
1444 "is active (as a percentage)") \
1445 \
1446 develop(bool, UseCMSAdaptiveFreeLists, true, \
1447 "Use Adaptive Free Lists in the CMS generation") \
1448 \
1449 develop(bool, UseAsyncConcMarkSweepGC, true, \
1450 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1451 \
1452 develop(bool, RotateCMSCollectionTypes, false, \
1453 "Rotate the CMS collections among concurrent and STW") \
1454 \
1455 product(bool, UseCMSBestFit, true, \
1456 "Use CMS best fit allocation strategy") \
1457 \
1458 product(bool, UseCMSCollectionPassing, true, \
1459 "Use passing of collection from background to foreground") \
1460 \
1461 product(bool, UseParNewGC, false, \
1462 "Use parallel threads in the new generation.") \
1463 \
1464 product(bool, ParallelGCVerbose, false, \
1465 "Verbose output for parallel GC.") \
1466 \
1467 product(intx, ParallelGCBufferWastePct, 10, \
1468 "wasted fraction of parallel allocation buffer.") \
1469 \
1470 product(bool, ParallelGCRetainPLAB, true, \
1471 "Retain parallel allocation buffers across scavenges.") \
1472 \
1473 product(intx, TargetPLABWastePct, 10, \
1474 "target wasted space in last buffer as pct of overall allocation")\
1475 \
1476 product(uintx, PLABWeight, 75, \
1477 "Percentage (0-100) used to weight the current sample when" \
1478 "computing exponentially decaying average for ResizePLAB.") \
1479 \
1480 product(bool, ResizePLAB, true, \
1481 "Dynamically resize (survivor space) promotion labs") \
1482 \
1483 product(bool, PrintPLAB, false, \
1484 "Print (survivor space) promotion labs sizing decisions") \
1485 \
1486 product(intx, ParGCArrayScanChunk, 50, \
1487 "Scan a subset and push remainder, if array is bigger than this") \
1488 \
1489 product(bool, ParGCUseLocalOverflow, false, \
1490 "Instead of a global overflow list, use local overflow stacks") \
1491 \
1492 product(bool, ParGCTrimOverflow, true, \
1493 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1494 \
1495 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1496 "Whether we should simulate work queue overflow in ParNew") \
1497 \
1498 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1499 "An `interval' counter that determines how frequently " \
1500 "we simulate overflow; a smaller number increases frequency") \
1501 \
1502 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1503 "The desired number of objects to claim from the overflow list") \
1504 \
1505 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1506 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1507 "parallel GC.") \
1508 \
1509 product(uintx, OldPLABWeight, 50, \
1510 "Percentage (0-100) used to weight the current sample when" \
1511 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1512 \
1513 product(bool, ResizeOldPLAB, true, \
1514 "Dynamically resize (old gen) promotion labs") \
1515 \
1516 product(bool, PrintOldPLAB, false, \
1517 "Print (old gen) promotion labs sizing decisions") \
1518 \
1519 product(uintx, CMSOldPLABMin, 16, \
1520 "Min size of CMS gen promotion lab caches per worker per blksize")\
1521 \
1522 product(uintx, CMSOldPLABMax, 1024, \
1523 "Max size of CMS gen promotion lab caches per worker per blksize")\
1524 \
1525 product(uintx, CMSOldPLABNumRefills, 4, \
1526 "Nominal number of refills of CMS gen promotion lab cache" \
1527 " per worker per block size") \
1528 \
1529 product(bool, CMSOldPLABResizeQuicker, false, \
1530 "Whether to react on-the-fly during a scavenge to a sudden" \
1531 " change in block demand rate") \
1532 \
1533 product(uintx, CMSOldPLABToleranceFactor, 4, \
1534 "The tolerance of the phase-change detector for on-the-fly" \
1535 " PLAB resizing during a scavenge") \
1536 \
1537 product(uintx, CMSOldPLABReactivityFactor, 2, \
1538 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1539 " during a scavenge") \
1540 \
1541 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1542 "The clamping of the gain in the feedback loop for on-the-fly" \
1543 " PLAB resizing during a scavenge") \
1544 \
1545 product(bool, AlwaysPreTouch, false, \
1546 "It forces all freshly committed pages to be pre-touched.") \
1547 \
1548 product(bool, CMSUseOldDefaults, false, \
1549 "A flag temporarily introduced to allow reverting to some " \
1550 "older default settings; older as of 6.0") \
1551 \
1552 product(intx, CMSYoungGenPerWorker, 16*M, \
1553 "The amount of young gen chosen by default per GC worker " \
1554 "thread available") \
1555 \
1556 product(bool, GCOverheadReporting, false, \
1557 "Enables the GC overhead reporting facility") \
1558 \
1559 product(intx, GCOverheadReportingPeriodMS, 100, \
1560 "Reporting period for conc GC overhead reporting, in ms ") \
1561 \
1562 product(bool, CMSIncrementalMode, false, \
1563 "Whether CMS GC should operate in \"incremental\" mode") \
1564 \
1565 product(uintx, CMSIncrementalDutyCycle, 10, \
1566 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1567 "CMSIncrementalPacing is enabled, then this is just the initial" \
1568 "value") \
1569 \
1570 product(bool, CMSIncrementalPacing, true, \
1571 "Whether the CMS incremental mode duty cycle should be " \
1572 "automatically adjusted") \
1573 \
1574 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1575 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1576 "enabled (a percentage, 0-100)") \
1577 \
1578 product(uintx, CMSIncrementalSafetyFactor, 10, \
1579 "Percentage (0-100) used to add conservatism when computing the " \
1580 "duty cycle") \
1581 \
1582 product(uintx, CMSIncrementalOffset, 0, \
1583 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1584 " is shifted to the right within the period between young GCs") \
1585 \
1586 product(uintx, CMSExpAvgFactor, 50, \
1587 "Percentage (0-100) used to weight the current sample when" \
1588 "computing exponential averages for CMS statistics.") \
1589 \
1590 product(uintx, CMS_FLSWeight, 75, \
1591 "Percentage (0-100) used to weight the current sample when" \
1592 "computing exponentially decating averages for CMS FLS statistics.") \
1593 \
1594 product(uintx, CMS_FLSPadding, 1, \
1595 "The multiple of deviation from mean to use for buffering" \
1596 "against volatility in free list demand.") \
1597 \
1598 product(uintx, FLSCoalescePolicy, 2, \
1599 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1600 \
1601 product(bool, FLSAlwaysCoalesceLarge, false, \
1602 "CMS: Larger free blocks are always available for coalescing") \
1603 \
1604 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1605 "CMS: the smaller the percentage the greater the coalition force")\
1606 \
1607 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1608 "CMS: the factor by which to inflate estimated demand of small" \
1609 " block sizes to prevent coalescing with an adjoining block") \
1610 \
1611 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1612 "CMS: the factor by which to inflate estimated demand of large" \
1613 " block sizes to prevent coalescing with an adjoining block") \
1614 \
1615 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1616 "CMS: the factor by which to inflate estimated demand of small" \
1617 " block sizes to prevent splitting to supply demand for smaller" \
1618 " blocks") \
1619 \
1620 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1621 "CMS: the factor by which to inflate estimated demand of large" \
1622 " block sizes to prevent splitting to supply demand for smaller" \
1623 " blocks") \
1624 \
1625 product(bool, CMSExtrapolateSweep, false, \
1626 "CMS: cushion for block demand during sweep") \
1627 \
1628 product(uintx, CMS_SweepWeight, 75, \
1629 "Percentage (0-100) used to weight the current sample when " \
1630 "computing exponentially decaying average for inter-sweep " \
1631 "duration") \
1632 \
1633 product(uintx, CMS_SweepPadding, 1, \
1634 "The multiple of deviation from mean to use for buffering " \
1635 "against volatility in inter-sweep duration.") \
1636 \
1637 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1638 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1639 "duration exceeds this threhold in milliseconds") \
1640 \
1641 develop(bool, CMSTraceIncrementalMode, false, \
1642 "Trace CMS incremental mode") \
1643 \
1644 develop(bool, CMSTraceIncrementalPacing, false, \
1645 "Trace CMS incremental mode pacing computation") \
1646 \
1647 develop(bool, CMSTraceThreadState, false, \
1648 "Trace the CMS thread state (enable the trace_state() method)") \
1649 \
1650 product(bool, CMSClassUnloadingEnabled, false, \
1651 "Whether class unloading enabled when using CMS GC") \
1652 \
1653 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1654 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1655 " for which classes may not be unloaded") \
1656 \
1657 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1658 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1659 \
1660 product(bool, UseCMSCompactAtFullCollection, true, \
1661 "Use mark sweep compact at full collections") \
1662 \
1663 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1664 "Number of CMS full collection done before compaction if > 0") \
1665 \
1666 develop(intx, CMSDictionaryChoice, 0, \
1667 "Use BinaryTreeDictionary as default in the CMS generation") \
1668 \
1669 product(uintx, CMSIndexedFreeListReplenish, 4, \
1670 "Replenish an indexed free list with this number of chunks") \
1671 \
1672 product(bool, CMSReplenishIntermediate, true, \
1673 "Replenish all intermediate free-list caches") \
1674 \
1675 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1676 "When satisfying batched demand, split blocks from the " \
1677 "IndexedFreeList whose size is a multiple of requested size") \
1678 \
1679 product(bool, CMSLoopWarn, false, \
1680 "Warn in case of excessive CMS looping") \
1681 \
1682 develop(bool, CMSOverflowEarlyRestoration, false, \
1683 "Whether preserved marks should be restored early") \
1684 \
1685 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1686 "Size of marking stack") \
1687 \
1688 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1689 "Max size of marking stack") \
1690 \
1691 notproduct(bool, CMSMarkStackOverflowALot, false, \
1692 "Whether we should simulate frequent marking stack / work queue" \
1693 " overflow") \
1694 \
1695 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1696 "An `interval' counter that determines how frequently" \
1697 " we simulate overflow; a smaller number increases frequency") \
1698 \
1699 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1700 "(Temporary, subject to experimentation)" \
1701 "Maximum number of abortable preclean iterations, if > 0") \
1702 \
1703 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1704 "(Temporary, subject to experimentation)" \
1705 "Maximum time in abortable preclean in ms") \
1706 \
1707 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1708 "(Temporary, subject to experimentation)" \
1709 "Nominal minimum work per abortable preclean iteration") \
1710 \
1711 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1712 "(Temporary, subject to experimentation)" \
1713 " Time that we sleep between iterations when not given" \
1714 " enough work per iteration") \
1715 \
1716 product(uintx, CMSRescanMultiple, 32, \
1717 "Size (in cards) of CMS parallel rescan task") \
1718 \
1719 product(uintx, CMSConcMarkMultiple, 32, \
1720 "Size (in cards) of CMS concurrent MT marking task") \
1721 \
1722 product(uintx, CMSRevisitStackSize, 1*M, \
1723 "Size of CMS KlassKlass revisit stack") \
1724 \
1725 product(bool, CMSAbortSemantics, false, \
1726 "Whether abort-on-overflow semantics is implemented") \
1727 \
1728 product(bool, CMSParallelRemarkEnabled, true, \
1729 "Whether parallel remark enabled (only if ParNewGC)") \
1730 \
1731 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1732 "Whether parallel remark of survivor space" \
1733 " enabled (effective only if CMSParallelRemarkEnabled)") \
1734 \
1735 product(bool, CMSPLABRecordAlways, true, \
1736 "Whether to always record survivor space PLAB bdries" \
1737 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1738 \
1739 product(bool, CMSConcurrentMTEnabled, true, \
1740 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1741 \
1742 product(bool, CMSPermGenPrecleaningEnabled, true, \
1743 "Whether concurrent precleaning enabled in perm gen" \
1744 " (effective only when CMSPrecleaningEnabled is true)") \
1745 \
1746 product(bool, CMSPrecleaningEnabled, true, \
1747 "Whether concurrent precleaning enabled") \
1748 \
1749 product(uintx, CMSPrecleanIter, 3, \
1750 "Maximum number of precleaning iteration passes") \
1751 \
1752 product(uintx, CMSPrecleanNumerator, 2, \
1753 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1754 " ratio") \
1755 \
1756 product(uintx, CMSPrecleanDenominator, 3, \
1757 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1758 " ratio") \
1759 \
1760 product(bool, CMSPrecleanRefLists1, true, \
1761 "Preclean ref lists during (initial) preclean phase") \
1762 \
1763 product(bool, CMSPrecleanRefLists2, false, \
1764 "Preclean ref lists during abortable preclean phase") \
1765 \
1766 product(bool, CMSPrecleanSurvivors1, false, \
1767 "Preclean survivors during (initial) preclean phase") \
1768 \
1769 product(bool, CMSPrecleanSurvivors2, true, \
1770 "Preclean survivors during abortable preclean phase") \
1771 \
1772 product(uintx, CMSPrecleanThreshold, 1000, \
1773 "Don't re-iterate if #dirty cards less than this") \
1774 \
1775 product(bool, CMSCleanOnEnter, true, \
1776 "Clean-on-enter optimization for reducing number of dirty cards") \
1777 \
1778 product(uintx, CMSRemarkVerifyVariant, 1, \
1779 "Choose variant (1,2) of verification following remark") \
1780 \
1781 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1782 "If Eden used is below this value, don't try to schedule remark") \
1783 \
1784 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1785 "The Eden occupancy % at which to try and schedule remark pause") \
1786 \
1787 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1788 "Start sampling Eden top at least before yg occupancy reaches" \
1789 " 1/<ratio> of the size at which we plan to schedule remark") \
1790 \
1791 product(uintx, CMSSamplingGrain, 16*K, \
1792 "The minimum distance between eden samples for CMS (see above)") \
1793 \
1794 product(bool, CMSScavengeBeforeRemark, false, \
1795 "Attempt scavenge before the CMS remark step") \
1796 \
1797 develop(bool, CMSTraceSweeper, false, \
1798 "Trace some actions of the CMS sweeper") \
1799 \
1800 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1801 "Don't drain below this size per parallel worker/thief") \
1802 \
1803 manageable(intx, CMSWaitDuration, 2000, \
1804 "Time in milliseconds that CMS thread waits for young GC") \
1805 \
1806 product(bool, CMSYield, true, \
1807 "Yield between steps of concurrent mark & sweep") \
1808 \
1809 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1810 "Bitmap operations should process at most this many bits" \
1811 "between yields") \
1812 \
1813 product(bool, CMSDumpAtPromotionFailure, false, \
1814 "Dump useful information about the state of the CMS old " \
1815 " generation upon a promotion failure.") \
1816 \
1817 product(bool, CMSPrintChunksInDump, false, \
1818 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1819 " more detailed information about the free chunks.") \
1820 \
1821 product(bool, CMSPrintObjectsInDump, false, \
1822 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1823 " more detailed information about the allocated objects.") \
1824 \
1825 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1826 "Verify that all refs across the FLS boundary " \
1827 " are to valid objects") \
1828 \
1829 diagnostic(bool, FLSVerifyLists, false, \
1830 "Do lots of (expensive) FreeListSpace verification") \
1831 \
1832 diagnostic(bool, FLSVerifyIndexTable, false, \
1833 "Do lots of (expensive) FLS index table verification") \
1834 \
1835 develop(bool, FLSVerifyDictionary, false, \
1836 "Do lots of (expensive) FLS dictionary verification") \
1837 \
1838 develop(bool, VerifyBlockOffsetArray, false, \
1839 "Do (expensive!) block offset array verification") \
1840 \
1841 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1842 "Maintain _unallocated_block in BlockOffsetArray" \
1843 " (currently applicable only to CMS collector)") \
1844 \
1845 develop(bool, TraceCMSState, false, \
1846 "Trace the state of the CMS collection") \
1847 \
1848 product(intx, RefDiscoveryPolicy, 0, \
1849 "Whether reference-based(0) or referent-based(1)") \
1850 \
1851 product(bool, ParallelRefProcEnabled, false, \
1852 "Enable parallel reference processing whenever possible") \
1853 \
1854 product(bool, ParallelRefProcBalancingEnabled, true, \
1855 "Enable balancing of reference processing queues") \
1856 \
1857 product(intx, CMSTriggerRatio, 80, \
1858 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1859 "allocated before a CMS collection cycle commences") \
1860 \
1861 product(intx, CMSTriggerPermRatio, 80, \
1862 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1863 "is allocated before a CMS collection cycle commences, that " \
1864 "also collects the perm generation") \
1865 \
1866 product(uintx, CMSBootstrapOccupancy, 50, \
1867 "Percentage CMS generation occupancy at which to " \
1868 "initiate CMS collection for bootstrapping collection stats") \
1869 \
1870 product(intx, CMSInitiatingOccupancyFraction, -1, \
1871 "Percentage CMS generation occupancy to start a CMS collection " \
1872 "cycle. A negative value means that CMSTriggerRatio is used") \
1873 \
1874 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1875 "Percentage of the (entire) heap occupancy to start a " \
1876 "concurrent GC cycle. It us used by GCs that trigger a " \
1877 "concurrent GC cycle based on the occupancy of the entire heap, " \
1878 "not just one of the generations (e.g., G1). A value of 0 " \
1879 "denotes 'do constant GC cycles'.") \
1880 \
1881 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1882 "Percentage CMS perm generation occupancy to start a " \
1883 "CMScollection cycle. A negative value means that " \
1884 "CMSTriggerPermRatio is used") \
1885 \
1886 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1887 "Only use occupancy as a crierion for starting a CMS collection") \
1888 \
1889 product(intx, CMSIsTooFullPercentage, 98, \
1890 "An absolute ceiling above which CMS will always consider the " \
1891 "perm gen ripe for collection") \
1892 \
1893 develop(bool, CMSTestInFreeList, false, \
1894 "Check if the coalesced range is already in the " \
1895 "free lists as claimed") \
1896 \
1897 notproduct(bool, CMSVerifyReturnedBytes, false, \
1898 "Check that all the garbage collected was returned to the " \
1899 "free lists.") \
1900 \
1901 notproduct(bool, ScavengeALot, false, \
1902 "Force scavenge at every Nth exit from the runtime system " \
1903 "(N=ScavengeALotInterval)") \
1904 \
1905 develop(bool, FullGCALot, false, \
1906 "Force full gc at every Nth exit from the runtime system " \
1907 "(N=FullGCALotInterval)") \
1908 \
1909 notproduct(bool, GCALotAtAllSafepoints, false, \
1910 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1911 \
1912 product(bool, PrintPromotionFailure, false, \
1913 "Print additional diagnostic information following " \
1914 " promotion failure") \
1915 \
1916 notproduct(bool, PromotionFailureALot, false, \
1917 "Use promotion failure handling on every youngest generation " \
1918 "collection") \
1919 \
1920 develop(uintx, PromotionFailureALotCount, 1000, \
1921 "Number of promotion failures occurring at ParGCAllocBuffer" \
1922 "refill attempts (ParNew) or promotion attempts " \
1923 "(other young collectors) ") \
1924 \
1925 develop(uintx, PromotionFailureALotInterval, 5, \
1926 "Total collections between promotion failures alot") \
1927 \
1928 experimental(intx, WorkStealingSleepMillis, 1, \
1929 "Sleep time when sleep is used for yields") \
1930 \
1931 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \
1932 "Number of yields before a sleep is done during workstealing") \
1933 \
1934 experimental(uintx, WorkStealingHardSpins, 4096, \
1935 "Number of iterations in a spin loop between checks on " \
1936 "time out of hard spin") \
1937 \
1938 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1939 "Ratio of hard spins to calls to yield") \
1940 \
1941 product(uintx, PreserveMarkStackSize, 1024, \
1942 "Size for stack used in promotion failure handling") \
1943 \
1944 develop(uintx, ObjArrayMarkingStride, 512, \
1945 "Number of ObjArray elements to push onto the marking stack" \
1946 "before pushing a continuation entry") \
1947 \
1948 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1949 \
1950 product_pd(bool, ResizeTLAB, \
1951 "Dynamically resize tlab size for threads") \
1952 \
1953 product(bool, ZeroTLAB, false, \
1954 "Zero out the newly created TLAB") \
1955 \
1956 product(bool, FastTLABRefill, true, \
1957 "Use fast TLAB refill code") \
1958 \
1959 product(bool, PrintTLAB, false, \
1960 "Print various TLAB related information") \
1961 \
1962 product(bool, TLABStats, true, \
1963 "Print various TLAB related information") \
1964 \
1965 product(bool, PrintRevisitStats, false, \
1966 "Print revisit (klass and MDO) stack related information") \
1967 \
1968 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
1969 "Enable LowMemoryProtection")) \
1970 \
1971 product_pd(bool, NeverActAsServerClassMachine, \
1972 "Never act like a server-class machine") \
1973 \
1974 product(bool, AlwaysActAsServerClassMachine, false, \
1975 "Always act like a server-class machine") \
1976 \
1977 product_pd(uint64_t, MaxRAM, \
1978 "Real memory size (in bytes) used to set maximum heap size") \
1979 \
1980 product(uintx, ErgoHeapSizeLimit, 0, \
1981 "Maximum ergonomically set heap size (in bytes); zero means use " \
1982 "MaxRAM / MaxRAMFraction") \
1983 \
1984 product(uintx, MaxRAMFraction, 4, \
1985 "Maximum fraction (1/n) of real memory used for maximum heap " \
1986 "size") \
1987 \
1988 product(uintx, DefaultMaxRAMFraction, 4, \
1989 "Maximum fraction (1/n) of real memory used for maximum heap " \
1990 "size; deprecated: to be renamed to MaxRAMFraction") \
1991 \
1992 product(uintx, MinRAMFraction, 2, \
1993 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
1994 "size on systems with small physical memory size") \
1995 \
1996 product(uintx, InitialRAMFraction, 64, \
1997 "Fraction (1/n) of real memory used for initial heap size") \
1998 \
1999 product(bool, UseAutoGCSelectPolicy, false, \
2000 "Use automatic collection selection policy") \
2001 \
2002 product(uintx, AutoGCSelectPauseMillis, 5000, \
2003 "Automatic GC selection pause threshhold in ms") \
2004 \
2005 product(bool, UseAdaptiveSizePolicy, true, \
2006 "Use adaptive generation sizing policies") \
2007 \
2008 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2009 "Use adaptive survivor sizing policies") \
2010 \
2011 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2012 "Use adaptive young-old sizing policies at minor collections") \
2013 \
2014 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2015 "Use adaptive young-old sizing policies at major collections") \
2016 \
2017 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2018 "Use statistics from System.GC for adaptive size policy") \
2019 \
2020 product(bool, UseAdaptiveGCBoundary, false, \
2021 "Allow young-old boundary to move") \
2022 \
2023 develop(bool, TraceAdaptiveGCBoundary, false, \
2024 "Trace young-old boundary moves") \
2025 \
2026 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2027 "Resize the virtual spaces of the young or old generations") \
2028 \
2029 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2030 "Policy for changeing generation size for throughput goals") \
2031 \
2032 product(uintx, AdaptiveSizePausePolicy, 0, \
2033 "Policy for changing generation size for pause goals") \
2034 \
2035 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2036 "Adjust tenured generation to achive a minor pause goal") \
2037 \
2038 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2039 "Adjust young generation to achive a major pause goal") \
2040 \
2041 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2042 "Number of steps where heuristics is used before data is used") \
2043 \
2044 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2045 "Number of collections before the adaptive sizing is started") \
2046 \
2047 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2048 "Collecton interval for printing information; zero => never") \
2049 \
2050 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2051 "Use adaptive minimum footprint as a goal") \
2052 \
2053 product(uintx, AdaptiveSizePolicyWeight, 10, \
2054 "Weight given to exponential resizing, between 0 and 100") \
2055 \
2056 product(uintx, AdaptiveTimeWeight, 25, \
2057 "Weight given to time in adaptive policy, between 0 and 100") \
2058 \
2059 product(uintx, PausePadding, 1, \
2060 "How much buffer to keep for pause time") \
2061 \
2062 product(uintx, PromotedPadding, 3, \
2063 "How much buffer to keep for promotion failure") \
2064 \
2065 product(uintx, SurvivorPadding, 3, \
2066 "How much buffer to keep for survivor overflow") \
2067 \
2068 product(uintx, AdaptivePermSizeWeight, 20, \
2069 "Weight for perm gen exponential resizing, between 0 and 100") \
2070 \
2071 product(uintx, PermGenPadding, 3, \
2072 "How much buffer to keep for perm gen sizing") \
2073 \
2074 product(uintx, ThresholdTolerance, 10, \
2075 "Allowed collection cost difference between generations") \
2076 \
2077 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2078 "If collection costs are within margin, reduce both by full " \
2079 "delta") \
2080 \
2081 product(uintx, YoungGenerationSizeIncrement, 20, \
2082 "Adaptive size percentage change in young generation") \
2083 \
2084 product(uintx, YoungGenerationSizeSupplement, 80, \
2085 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2086 \
2087 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2088 "Decay factor to YoungedGenerationSizeSupplement") \
2089 \
2090 product(uintx, TenuredGenerationSizeIncrement, 20, \
2091 "Adaptive size percentage change in tenured generation") \
2092 \
2093 product(uintx, TenuredGenerationSizeSupplement, 80, \
2094 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2095 \
2096 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2097 "Decay factor to TenuredGenerationSizeIncrement") \
2098 \
2099 product(uintx, MaxGCPauseMillis, max_uintx, \
2100 "Adaptive size policy maximum GC pause time goal in msec, " \
2101 "or (G1 Only) the max. GC time per MMU time slice") \
2102 \
2103 product(uintx, GCPauseIntervalMillis, 0, \
2104 "Time slice for MMU specification") \
2105 \
2106 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2107 "Adaptive size policy maximum GC minor pause time goal in msec") \
2108 \
2109 product(uintx, GCTimeRatio, 99, \
2110 "Adaptive size policy application time to GC time ratio") \
2111 \
2112 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2113 "Adaptive size scale down factor for shrinking") \
2114 \
2115 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2116 "Adaptive size decays the major cost for long major intervals") \
2117 \
2118 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2119 "Time scale over which major costs decay") \
2120 \
2121 product(uintx, MinSurvivorRatio, 3, \
2122 "Minimum ratio of young generation/survivor space size") \
2123 \
2124 product(uintx, InitialSurvivorRatio, 8, \
2125 "Initial ratio of eden/survivor space size") \
2126 \
2127 product(uintx, BaseFootPrintEstimate, 256*M, \
2128 "Estimate of footprint other than Java Heap") \
2129 \
2130 product(bool, UseGCOverheadLimit, true, \
2131 "Use policy to limit of proportion of time spent in GC " \
2132 "before an OutOfMemory error is thrown") \
2133 \
2134 product(uintx, GCTimeLimit, 98, \
2135 "Limit of proportion of time spent in GC before an OutOfMemory" \
2136 "error is thrown (used with GCHeapFreeLimit)") \
2137 \
2138 product(uintx, GCHeapFreeLimit, 2, \
2139 "Minimum percentage of free space after a full GC before an " \
2140 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2141 \
2142 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2143 "Number of consecutive collections before gc time limit fires") \
2144 \
2145 product(bool, PrintAdaptiveSizePolicy, false, \
2146 "Print information about AdaptiveSizePolicy") \
2147 \
2148 product(intx, PrefetchCopyIntervalInBytes, -1, \
2149 "How far ahead to prefetch destination area (<= 0 means off)") \
2150 \
2151 product(intx, PrefetchScanIntervalInBytes, -1, \
2152 "How far ahead to prefetch scan area (<= 0 means off)") \
2153 \
2154 product(intx, PrefetchFieldsAhead, -1, \
2155 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2156 \
2157 develop(bool, UsePrefetchQueue, true, \
2158 "Use the prefetch queue during PS promotion") \
2159 \
2160 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2161 "Verify system before exiting") \
2162 \
2163 diagnostic(bool, VerifyBeforeGC, false, \
2164 "Verify memory system before GC") \
2165 \
2166 diagnostic(bool, VerifyAfterGC, false, \
2167 "Verify memory system after GC") \
2168 \
2169 diagnostic(bool, VerifyDuringGC, false, \
2170 "Verify memory system during GC (between phases)") \
2171 \
2172 diagnostic(bool, GCParallelVerificationEnabled, true, \
2173 "Enable parallel memory system verification") \
2174 \
2175 diagnostic(bool, DeferInitialCardMark, false, \
2176 "When +ReduceInitialCardMarks, explicitly defer any that " \
2177 "may arise from new_pre_store_barrier") \
2178 \
2179 diagnostic(bool, VerifyRememberedSets, false, \
2180 "Verify GC remembered sets") \
2181 \
2182 diagnostic(bool, VerifyObjectStartArray, true, \
2183 "Verify GC object start array if verify before/after") \
2184 \
2185 product(bool, DisableExplicitGC, false, \
2186 "Tells whether calling System.gc() does a full GC") \
2187 \
2188 notproduct(bool, CheckMemoryInitialization, false, \
2189 "Checks memory initialization") \
2190 \
2191 product(bool, CollectGen0First, false, \
2192 "Collect youngest generation before each full GC") \
2193 \
2194 diagnostic(bool, BindCMSThreadToCPU, false, \
2195 "Bind CMS Thread to CPU if possible") \
2196 \
2197 diagnostic(uintx, CPUForCMSThread, 0, \
2198 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2199 \
2200 product(bool, BindGCTaskThreadsToCPUs, false, \
2201 "Bind GCTaskThreads to CPUs if possible") \
2202 \
2203 product(bool, UseGCTaskAffinity, false, \
2204 "Use worker affinity when asking for GCTasks") \
2205 \
2206 product(uintx, ProcessDistributionStride, 4, \
2207 "Stride through processors when distributing processes") \
2208 \
2209 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2210 "number of times the coordinator GC thread will sleep while " \
2211 "yielding before giving up and resuming GC") \
2212 \
2213 product(uintx, CMSYieldSleepCount, 0, \
2214 "number of times a GC thread (minus the coordinator) " \
2215 "will sleep while yielding before giving up and resuming GC") \
2216 \
2217 /* gc tracing */ \
2218 manageable(bool, PrintGC, false, \
2219 "Print message at garbage collect") \
2220 \
2221 manageable(bool, PrintGCDetails, false, \
2222 "Print more details at garbage collect") \
2223 \
2224 manageable(bool, PrintGCDateStamps, false, \
2225 "Print date stamps at garbage collect") \
2226 \
2227 manageable(bool, PrintGCTimeStamps, false, \
2228 "Print timestamps at garbage collect") \
2229 \
2230 product(bool, PrintGCTaskTimeStamps, false, \
2231 "Print timestamps for individual gc worker thread tasks") \
2232 \
2233 develop(intx, ConcGCYieldTimeout, 0, \
2234 "If non-zero, assert that GC threads yield within this # of ms.") \
2235 \
2236 notproduct(bool, TraceMarkSweep, false, \
2237 "Trace mark sweep") \
2238 \
2239 product(bool, PrintReferenceGC, false, \
2240 "Print times spent handling reference objects during GC " \
2241 " (enabled only when PrintGCDetails)") \
2242 \
2243 develop(bool, TraceReferenceGC, false, \
2244 "Trace handling of soft/weak/final/phantom references") \
2245 \
2246 develop(bool, TraceFinalizerRegistration, false, \
2247 "Trace registration of final references") \
2248 \
2249 notproduct(bool, TraceScavenge, false, \
2250 "Trace scavenge") \
2251 \
2252 product_rw(bool, TraceClassLoading, false, \
2253 "Trace all classes loaded") \
2254 \
2255 product(bool, TraceClassLoadingPreorder, false, \
2256 "Trace all classes loaded in order referenced (not loaded)") \
2257 \
2258 product_rw(bool, TraceClassUnloading, false, \
2259 "Trace unloading of classes") \
2260 \
2261 product_rw(bool, TraceLoaderConstraints, false, \
2262 "Trace loader constraints") \
2263 \
2264 product(bool, TraceGen0Time, false, \
2265 "Trace accumulated time for Gen 0 collection") \
2266 \
2267 product(bool, TraceGen1Time, false, \
2268 "Trace accumulated time for Gen 1 collection") \
2269 \
2270 product(bool, PrintTenuringDistribution, false, \
2271 "Print tenuring age information") \
2272 \
2273 product_rw(bool, PrintHeapAtGC, false, \
2274 "Print heap layout before and after each GC") \
2275 \
2276 product_rw(bool, PrintHeapAtGCExtended, false, \
2277 "Prints extended information about the layout of the heap " \
2278 "when -XX:+PrintHeapAtGC is set") \
2279 \
2280 product(bool, PrintHeapAtSIGBREAK, true, \
2281 "Print heap layout in response to SIGBREAK") \
2282 \
2283 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2284 "Print a class histogram before any major stop-world GC") \
2285 \
2286 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2287 "Print a class histogram after any major stop-world GC") \
2288 \
2289 manageable(bool, PrintClassHistogram, false, \
2290 "Print a histogram of class instances") \
2291 \
2292 develop(bool, TraceWorkGang, false, \
2293 "Trace activities of work gangs") \
2294 \
2295 product(bool, TraceParallelOldGCTasks, false, \
2296 "Trace multithreaded GC activity") \
2297 \
2298 develop(bool, TraceBlockOffsetTable, false, \
2299 "Print BlockOffsetTable maps") \
2300 \
2301 develop(bool, TraceCardTableModRefBS, false, \
2302 "Print CardTableModRefBS maps") \
2303 \
2304 develop(bool, TraceGCTaskManager, false, \
2305 "Trace actions of the GC task manager") \
2306 \
2307 develop(bool, TraceGCTaskQueue, false, \
2308 "Trace actions of the GC task queues") \
2309 \
2310 develop(bool, TraceGCTaskThread, false, \
2311 "Trace actions of the GC task threads") \
2312 \
2313 product(bool, PrintParallelOldGCPhaseTimes, false, \
2314 "Print the time taken by each parallel old gc phase." \
2315 "PrintGCDetails must also be enabled.") \
2316 \
2317 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2318 "Trace parallel old gc marking phase") \
2319 \
2320 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2321 "Trace parallel old gc summary phase") \
2322 \
2323 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2324 "Trace parallel old gc compaction phase") \
2325 \
2326 develop(bool, TraceParallelOldGCDensePrefix, false, \
2327 "Trace parallel old gc dense prefix computation") \
2328 \
2329 develop(bool, IgnoreLibthreadGPFault, false, \
2330 "Suppress workaround for libthread GP fault") \
2331 \
2332 product(bool, PrintJNIGCStalls, false, \
2333 "Print diagnostic message when GC is stalled" \
2334 "by JNI critical section") \
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, true, \
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, CICloneLoopTestLimit, 100, \
2382 "size limit for blocks heuristically cloned in ciTypeFlow") \
2383 \
2384 /* temp diagnostics */ \
2385 \
2386 diagnostic(bool, TraceRedundantCompiles, false, \
2387 "Have compile broker print when a request already in the queue is"\
2388 " requested again") \
2389 \
2390 diagnostic(bool, InitialCompileFast, false, \
2391 "Initial compile at CompLevel_fast_compile") \
2392 \
2393 diagnostic(bool, InitialCompileReallyFast, false, \
2394 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2395 \
2396 diagnostic(bool, FullProfileOnReInterpret, true, \
2397 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2398 \
2399 /* compiler */ \
2400 \
2401 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2402 "Number of compiler threads to run") \
2403 \
2404 product(intx, CompilationPolicyChoice, 0, \
2405 "which compilation policy (0/1)") \
2406 \
2407 develop(bool, UseStackBanging, true, \
2408 "use stack banging for stack overflow checks (required for " \
2409 "proper StackOverflow handling; disable only to measure cost " \
2410 "of stackbanging)") \
2411 \
2412 develop(bool, Use24BitFPMode, true, \
2413 "Set 24-bit FPU mode on a per-compile basis ") \
2414 \
2415 develop(bool, Use24BitFP, true, \
2416 "use FP instructions that produce 24-bit precise results") \
2417 \
2418 develop(bool, UseStrictFP, true, \
2419 "use strict fp if modifier strictfp is set") \
2420 \
2421 develop(bool, GenerateSynchronizationCode, true, \
2422 "generate locking/unlocking code for synchronized methods and " \
2423 "monitors") \
2424 \
2425 develop(bool, GenerateCompilerNullChecks, true, \
2426 "Generate explicit null checks for loads/stores/calls") \
2427 \
2428 develop(bool, GenerateRangeChecks, true, \
2429 "Generate range checks for array accesses") \
2430 \
2431 develop_pd(bool, ImplicitNullChecks, \
2432 "generate code for implicit null checks") \
2433 \
2434 product(bool, PrintSafepointStatistics, false, \
2435 "print statistics about safepoint synchronization") \
2436 \
2437 product(intx, PrintSafepointStatisticsCount, 300, \
2438 "total number of safepoint statistics collected " \
2439 "before printing them out") \
2440 \
2441 product(intx, PrintSafepointStatisticsTimeout, -1, \
2442 "print safepoint statistics only when safepoint takes" \
2443 " more than PrintSafepointSatisticsTimeout in millis") \
2444 \
2445 product(bool, TraceSafepointCleanupTime, false, \
2446 "print the break down of clean up tasks performed during" \
2447 " safepoint") \
2448 \
2449 develop(bool, InlineAccessors, true, \
2450 "inline accessor methods (get/set)") \
2451 \
2452 product(bool, Inline, true, \
2453 "enable inlining") \
2454 \
2455 product(bool, ClipInlining, true, \
2456 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2457 \
2458 develop(bool, UseCHA, true, \
2459 "enable CHA") \
2460 \
2461 product(bool, UseTypeProfile, true, \
2462 "Check interpreter profile for historically monomorphic calls") \
2463 \
2464 product(intx, TypeProfileMajorReceiverPercent, 90, \
2465 "% of major receiver type to all profiled receivers") \
2466 \
2467 notproduct(bool, TimeCompiler, false, \
2468 "time the compiler") \
2469 \
2470 notproduct(bool, TimeCompiler2, false, \
2471 "detailed time the compiler (requires +TimeCompiler)") \
2472 \
2473 diagnostic(bool, PrintInlining, false, \
2474 "prints inlining optimizations") \
2475 \
2476 diagnostic(bool, PrintIntrinsics, false, \
2477 "prints attempted and successful inlining of intrinsics") \
2478 \
2479 product(bool, UseCountLeadingZerosInstruction, false, \
2480 "Use count leading zeros instruction") \
2481 \
2482 product(bool, UsePopCountInstruction, false, \
2483 "Use population count instruction") \
2484 \
2485 diagnostic(ccstrlist, DisableIntrinsic, "", \
2486 "do not expand intrinsics whose (internal) names appear here") \
2487 \
2488 develop(bool, StressReflectiveCode, false, \
2489 "Use inexact types at allocations, etc., to test reflection") \
2490 \
2491 develop(bool, EagerInitialization, false, \
2492 "Eagerly initialize classes if possible") \
2493 \
2494 develop(bool, TraceMethodReplacement, false, \
2495 "Print when methods are replaced do to recompilation") \
2496 \
2497 develop(bool, PrintMethodFlushing, false, \
2498 "print the nmethods being flushed") \
2499 \
2500 notproduct(bool, LogMultipleMutexLocking, false, \
2501 "log locking and unlocking of mutexes (only if multiple locks " \
2502 "are held)") \
2503 \
2504 develop(bool, UseRelocIndex, false, \
2505 "use an index to speed random access to relocations") \
2506 \
2507 develop(bool, StressCodeBuffers, false, \
2508 "Exercise code buffer expansion and other rare state changes") \
2509 \
2510 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2511 "Generate extra debugging info for non-safepoints in nmethods") \
2512 \
2513 diagnostic(bool, DebugInlinedCalls, true, \
2514 "If false, restricts profiled locations to the root method only") \
2515 \
2516 product(bool, PrintVMOptions, trueInDebug, \
2517 "Print flags that appeared on the command line") \
2518 \
2519 product(bool, IgnoreUnrecognizedVMOptions, false, \
2520 "Ignore unrecognized VM options") \
2521 \
2522 product(bool, PrintCommandLineFlags, false, \
2523 "Print flags specified on command line or set by ergonomics") \
2524 \
2525 product(bool, PrintFlagsInitial, false, \
2526 "Print all VM flags before argument processing and exit VM") \
2527 \
2528 product(bool, PrintFlagsFinal, false, \
2529 "Print all VM flags after argument and ergonomic processing") \
2530 \
2531 notproduct(bool, PrintFlagsWithComments, false, \
2532 "Print all VM flags with default values and descriptions and exit")\
2533 \
2534 diagnostic(bool, SerializeVMOutput, true, \
2535 "Use a mutex to serialize output to tty and hotspot.log") \
2536 \
2537 diagnostic(bool, DisplayVMOutput, true, \
2538 "Display all VM output on the tty, independently of LogVMOutput") \
2539 \
2540 diagnostic(bool, LogVMOutput, trueInDebug, \
2541 "Save VM output to hotspot.log, or to LogFile") \
2542 \
2543 diagnostic(ccstr, LogFile, NULL, \
2544 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2545 \
2546 product(ccstr, ErrorFile, NULL, \
2547 "If an error occurs, save the error data to this file " \
2548 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2549 \
2550 product(bool, DisplayVMOutputToStderr, false, \
2551 "If DisplayVMOutput is true, display all VM output to stderr") \
2552 \
2553 product(bool, DisplayVMOutputToStdout, false, \
2554 "If DisplayVMOutput is true, display all VM output to stdout") \
2555 \
2556 product(bool, UseHeavyMonitors, false, \
2557 "use heavyweight instead of lightweight Java monitors") \
2558 \
2559 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2560 "print histogram of the symbol table") \
2561 \
2562 notproduct(bool, ExitVMOnVerifyError, false, \
2563 "standard exit from VM if bytecode verify error " \
2564 "(only in debug mode)") \
2565 \
2566 notproduct(ccstr, AbortVMOnException, NULL, \
2567 "Call fatal if this exception is thrown. Example: " \
2568 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2569 \
2570 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2571 "Call fatal if the exception pointed by AbortVMOnException " \
2572 "has this message.") \
2573 \
2574 develop(bool, DebugVtables, false, \
2575 "add debugging code to vtable dispatch") \
2576 \
2577 develop(bool, PrintVtables, false, \
2578 "print vtables when printing klass") \
2579 \
2580 notproduct(bool, PrintVtableStats, false, \
2581 "print vtables stats at end of run") \
2582 \
2583 develop(bool, TraceCreateZombies, false, \
2584 "trace creation of zombie nmethods") \
2585 \
2586 notproduct(bool, IgnoreLockingAssertions, false, \
2587 "disable locking assertions (for speed)") \
2588 \
2589 notproduct(bool, VerifyLoopOptimizations, false, \
2590 "verify major loop optimizations") \
2591 \
2592 product(bool, RangeCheckElimination, true, \
2593 "Split loop iterations to eliminate range checks") \
2594 \
2595 develop_pd(bool, UncommonNullCast, \
2596 "track occurrences of null in casts; adjust compiler tactics") \
2597 \
2598 develop(bool, TypeProfileCasts, true, \
2599 "treat casts like calls for purposes of type profiling") \
2600 \
2601 develop(bool, MonomorphicArrayCheck, true, \
2602 "Uncommon-trap array store checks that require full type check") \
2603 \
2604 diagnostic(bool, ProfileDynamicTypes, true, \
2605 "do extra type profiling and use it more aggressively") \
2606 \
2607 develop(bool, DelayCompilationDuringStartup, true, \
2608 "Delay invoking the compiler until main application class is " \
2609 "loaded") \
2610 \
2611 develop(bool, CompileTheWorld, false, \
2612 "Compile all methods in all classes in bootstrap class path " \
2613 "(stress test)") \
2614 \
2615 develop(bool, CompileTheWorldPreloadClasses, true, \
2616 "Preload all classes used by a class before start loading") \
2617 \
2618 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \
2619 "Compile all methods although class initializer failed") \
2620 \
2621 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2622 "Force a safepoint every n compiles so sweeper can keep up") \
2623 \
2624 develop(bool, TraceIterativeGVN, false, \
2625 "Print progress during Iterative Global Value Numbering") \
2626 \
2627 develop(bool, FillDelaySlots, true, \
2628 "Fill delay slots (on SPARC only)") \
2629 \
2630 develop(bool, VerifyIterativeGVN, false, \
2631 "Verify Def-Use modifications during sparse Iterative Global " \
2632 "Value Numbering") \
2633 \
2634 notproduct(bool, TracePhaseCCP, false, \
2635 "Print progress during Conditional Constant Propagation") \
2636 \
2637 develop(bool, TimeLivenessAnalysis, false, \
2638 "Time computation of bytecode liveness analysis") \
2639 \
2640 develop(bool, TraceLivenessGen, false, \
2641 "Trace the generation of liveness analysis information") \
2642 \
2643 notproduct(bool, TraceLivenessQuery, false, \
2644 "Trace queries of liveness analysis information") \
2645 \
2646 notproduct(bool, CollectIndexSetStatistics, false, \
2647 "Collect information about IndexSets") \
2648 \
2649 develop(bool, PrintDominators, false, \
2650 "Print out dominator trees for GVN") \
2651 \
2652 develop(bool, UseLoopSafepoints, true, \
2653 "Generate Safepoint nodes in every loop") \
2654 \
2655 notproduct(bool, TraceCISCSpill, false, \
2656 "Trace allocators use of cisc spillable instructions") \
2657 \
2658 notproduct(bool, TraceSpilling, false, \
2659 "Trace spilling") \
2660 \
2661 product(bool, SplitIfBlocks, true, \
2662 "Clone compares and control flow through merge points to fold " \
2663 "some branches") \
2664 \
2665 develop(intx, FastAllocateSizeLimit, 128*K, \
2666 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2667 "Inline allocations larger than this in doublewords must go slow")\
2668 \
2669 product(bool, AggressiveOpts, false, \
2670 "Enable aggressive optimizations - see arguments.cpp") \
2671 \
2672 product(bool, UseStringCache, false, \
2673 "Enable String cache capabilities on String.java") \
2674 \
2675 /* byte strings */ \
2676 product(bool, UseCompressedStrings, false, \
2677 "Enable byte-valued strings") \
2678 \
2679 product(bool, SpecialStringCompress, true, \
2680 "special version of string compress") \
2681 \
2682 product(bool, SpecialStringInflate, true, \
2683 "special version of string inflate") \
2684 \
2685 product(bool, SpecialStringCompareToCC, true, \
2686 "special version of string compareToCC") \
2687 \
2688 product(bool, SpecialStringIndexOfCC, true, \
2689 "special version of string indexOfCC") \
2690 \
2691 product(bool, SpecialStringEqualsCC, true, \
2692 "special version of string equalsCC") \
2693 \
2694 /* statistics */ \
2695 develop(bool, CountCompiledCalls, false, \
2696 "counts method invocations") \
2697 \
2698 notproduct(bool, CountRuntimeCalls, false, \
2699 "counts VM runtime calls") \
2700 \
2701 develop(bool, CountJNICalls, false, \
2702 "counts jni method invocations") \
2703 \
2704 notproduct(bool, CountJVMCalls, false, \
2705 "counts jvm method invocations") \
2706 \
2707 notproduct(bool, CountRemovableExceptions, false, \
2708 "count exceptions that could be replaced by branches due to " \
2709 "inlining") \
2710 \
2711 notproduct(bool, ICMissHistogram, false, \
2712 "produce histogram of IC misses") \
2713 \
2714 notproduct(bool, PrintClassStatistics, false, \
2715 "prints class statistics at end of run") \
2716 \
2717 notproduct(bool, PrintMethodStatistics, false, \
2718 "prints method statistics at end of run") \
2719 \
2720 /* interpreter */ \
2721 develop(bool, ClearInterpreterLocals, false, \
2722 "Always clear local variables of interpreter activations upon " \
2723 "entry") \
2724 \
2725 product_pd(bool, RewriteBytecodes, \
2726 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2727 \
2728 product_pd(bool, RewriteFrequentPairs, \
2729 "Rewrite frequently used bytecode pairs into a single bytecode") \
2730 \
2731 diagnostic(bool, PrintInterpreter, false, \
2732 "Prints the generated interpreter code") \
2733 \
2734 product(bool, UseInterpreter, true, \
2735 "Use interpreter for non-compiled methods") \
2736 \
2737 develop(bool, UseFastSignatureHandlers, true, \
2738 "Use fast signature handlers for native calls") \
2739 \
2740 develop(bool, UseV8InstrsOnly, false, \
2741 "Use SPARC-V8 Compliant instruction subset") \
2742 \
2743 product(bool, UseNiagaraInstrs, false, \
2744 "Use Niagara-efficient instruction subset") \
2745 \
2746 develop(bool, UseCASForSwap, false, \
2747 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2748 \
2749 product(bool, UseLoopCounter, true, \
2750 "Increment invocation counter on backward branch") \
2751 \
2752 product(bool, UseFastEmptyMethods, true, \
2753 "Use fast method entry code for empty methods") \
2754 \
2755 product(bool, UseFastAccessorMethods, true, \
2756 "Use fast method entry code for accessor methods") \
2757 \
2758 product_pd(bool, UseOnStackReplacement, \
2759 "Use on stack replacement, calls runtime if invoc. counter " \
2760 "overflows in loop") \
2761 \
2762 notproduct(bool, TraceOnStackReplacement, false, \
2763 "Trace on stack replacement") \
2764 \
2765 develop(bool, PoisonOSREntry, true, \
2766 "Detect abnormal calls to OSR code") \
2767 \
2768 product_pd(bool, PreferInterpreterNativeStubs, \
2769 "Use always interpreter stubs for native methods invoked via " \
2770 "interpreter") \
2771 \
2772 develop(bool, CountBytecodes, false, \
2773 "Count number of bytecodes executed") \
2774 \
2775 develop(bool, PrintBytecodeHistogram, false, \
2776 "Print histogram of the executed bytecodes") \
2777 \
2778 develop(bool, PrintBytecodePairHistogram, false, \
2779 "Print histogram of the executed bytecode pairs") \
2780 \
2781 diagnostic(bool, PrintSignatureHandlers, false, \
2782 "Print code generated for native method signature handlers") \
2783 \
2784 develop(bool, VerifyOops, false, \
2785 "Do plausibility checks for oops") \
2786 \
2787 develop(bool, CheckUnhandledOops, false, \
2788 "Check for unhandled oops in VM code") \
2789 \
2790 develop(bool, VerifyJNIFields, trueInDebug, \
2791 "Verify jfieldIDs for instance fields") \
2792 \
2793 notproduct(bool, VerifyJNIEnvThread, false, \
2794 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2795 "from JNI") \
2796 \
2797 develop(bool, VerifyFPU, false, \
2798 "Verify FPU state (check for NaN's, etc.)") \
2799 \
2800 develop(bool, VerifyThread, false, \
2801 "Watch the thread register for corruption (SPARC only)") \
2802 \
2803 develop(bool, VerifyActivationFrameSize, false, \
2804 "Verify that activation frame didn't become smaller than its " \
2805 "minimal size") \
2806 \
2807 develop(bool, TraceFrequencyInlining, false, \
2808 "Trace frequency based inlining") \
2809 \
2810 notproduct(bool, TraceTypeProfile, false, \
2811 "Trace type profile") \
2812 \
2813 develop_pd(bool, InlineIntrinsics, \
2814 "Inline intrinsics that can be statically resolved") \
2815 \
2816 product_pd(bool, ProfileInterpreter, \
2817 "Profile at the bytecode level during interpretation") \
2818 \
2819 develop_pd(bool, ProfileTraps, \
2820 "Profile deoptimization traps at the bytecode level") \
2821 \
2822 product(intx, ProfileMaturityPercentage, 20, \
2823 "number of method invocations/branches (expressed as % of " \
2824 "CompileThreshold) before using the method's profile") \
2825 \
2826 develop(bool, PrintMethodData, false, \
2827 "Print the results of +ProfileInterpreter at end of run") \
2828 \
2829 develop(bool, VerifyDataPointer, trueInDebug, \
2830 "Verify the method data pointer during interpreter profiling") \
2831 \
2832 develop(bool, VerifyCompiledCode, false, \
2833 "Include miscellaneous runtime verifications in nmethod code; " \
2834 "default off because it disturbs nmethod size heuristics") \
2835 \
2836 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2837 "Manually make GC thread crash then dump java stack trace; " \
2838 "Test only") \
2839 \
2840 /* compilation */ \
2841 product(bool, UseCompiler, true, \
2842 "use compilation") \
2843 \
2844 develop(bool, TraceCompilationPolicy, false, \
2845 "Trace compilation policy") \
2846 \
2847 develop(bool, TimeCompilationPolicy, false, \
2848 "Time the compilation policy") \
2849 \
2850 product(bool, UseCounterDecay, true, \
2851 "adjust recompilation counters") \
2852 \
2853 develop(intx, CounterHalfLifeTime, 30, \
2854 "half-life time of invocation counters (in secs)") \
2855 \
2856 develop(intx, CounterDecayMinIntervalLength, 500, \
2857 "Min. ms. between invocation of CounterDecay") \
2858 \
2859 product(bool, AlwaysCompileLoopMethods, false, \
2860 "when using recompilation, never interpret methods " \
2861 "containing loops") \
2862 \
2863 product(bool, DontCompileHugeMethods, true, \
2864 "don't compile methods > HugeMethodLimit") \
2865 \
2866 /* Bytecode escape analysis estimation. */ \
2867 product(bool, EstimateArgEscape, true, \
2868 "Analyze bytecodes to estimate escape state of arguments") \
2869 \
2870 product(intx, BCEATraceLevel, 0, \
2871 "How much tracing to do of bytecode escape analysis estimates") \
2872 \
2873 product(intx, MaxBCEAEstimateLevel, 5, \
2874 "Maximum number of nested calls that are analyzed by BC EA.") \
2875 \
2876 product(intx, MaxBCEAEstimateSize, 150, \
2877 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2878 \
2879 product(intx, AllocatePrefetchStyle, 1, \
2880 "0 = no prefetch, " \
2881 "1 = prefetch instructions for each allocation, " \
2882 "2 = use TLAB watermark to gate allocation prefetch, " \
2883 "3 = use BIS instruction on Sparc for allocation prefetch") \
2884 \
2885 product(intx, AllocatePrefetchDistance, -1, \
2886 "Distance to prefetch ahead of allocation pointer") \
2887 \
2888 product(intx, AllocatePrefetchLines, 1, \
2889 "Number of lines to prefetch ahead of allocation pointer") \
2890 \
2891 product(intx, AllocatePrefetchStepSize, 16, \
2892 "Step size in bytes of sequential prefetch instructions") \
2893 \
2894 product(intx, AllocatePrefetchInstr, 0, \
2895 "Prefetch instruction to prefetch ahead of allocation pointer") \
2896 \
2897 product(intx, ReadPrefetchInstr, 0, \
2898 "Prefetch instruction to prefetch ahead") \
2899 \
2900 /* deoptimization */ \
2901 develop(bool, TraceDeoptimization, false, \
2902 "Trace deoptimization") \
2903 \
2904 develop(bool, DebugDeoptimization, false, \
2905 "Tracing various information while debugging deoptimization") \
2906 \
2907 product(intx, SelfDestructTimer, 0, \
2908 "Will cause VM to terminate after a given time (in minutes) " \
2909 "(0 means off)") \
2910 \
2911 product(intx, MaxJavaStackTraceDepth, 1024, \
2912 "Max. no. of lines in the stack trace for Java exceptions " \
2913 "(0 means all)") \
2914 \
2915 NOT_EMBEDDED(develop(intx, GuaranteedSafepointInterval, 1000, \
2916 "Guarantee a safepoint (at least) every so many milliseconds " \
2917 "(0 means none)")) \
2918 \
2919 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2920 "Guarantee a safepoint (at least) every so many milliseconds " \
2921 "(0 means none)")) \
2922 \
2923 product(intx, SafepointTimeoutDelay, 10000, \
2924 "Delay in milliseconds for option SafepointTimeout") \
2925 \
2926 product(intx, NmethodSweepFraction, 4, \
2927 "Number of invocations of sweeper to cover all nmethods") \
2928 \
2929 product(intx, NmethodSweepCheckInterval, 5, \
2930 "Compilers wake up every n seconds to possibly sweep nmethods") \
2931 \
2932 notproduct(intx, MemProfilingInterval, 500, \
2933 "Time between each invocation of the MemProfiler") \
2934 \
2935 develop(intx, MallocCatchPtr, -1, \
2936 "Hit breakpoint when mallocing/freeing this pointer") \
2937 \
2938 notproduct(intx, AssertRepeat, 1, \
2939 "number of times to evaluate expression in assert " \
2940 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2941 \
2942 notproduct(ccstrlist, SuppressErrorAt, "", \
2943 "List of assertions (file:line) to muzzle") \
2944 \
2945 notproduct(uintx, HandleAllocationLimit, 1024, \
2946 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2947 "is used") \
2948 \
2949 develop(uintx, TotalHandleAllocationLimit, 1024, \
2950 "Threshold for total handle allocation when " \
2951 "+TraceHandleAllocation is used") \
2952 \
2953 develop(intx, StackPrintLimit, 100, \
2954 "number of stack frames to print in VM-level stack dump") \
2955 \
2956 notproduct(intx, MaxElementPrintSize, 256, \
2957 "maximum number of elements to print") \
2958 \
2959 notproduct(intx, MaxSubklassPrintSize, 4, \
2960 "maximum number of subklasses to print when printing klass") \
2961 \
2962 product(intx, MaxInlineLevel, 9, \
2963 "maximum number of nested calls that are inlined") \
2964 \
2965 product(intx, MaxRecursiveInlineLevel, 1, \
2966 "maximum number of nested recursive calls that are inlined") \
2967 \
2968 product_pd(intx, InlineSmallCode, \
2969 "Only inline already compiled methods if their code size is " \
2970 "less than this") \
2971 \
2972 product(intx, MaxInlineSize, 35, \
2973 "maximum bytecode size of a method to be inlined") \
2974 \
2975 product_pd(intx, FreqInlineSize, \
2976 "maximum bytecode size of a frequent method to be inlined") \
2977 \
2978 product(intx, MaxTrivialSize, 6, \
2979 "maximum bytecode size of a trivial method to be inlined") \
2980 \
2981 product(intx, MinInliningThreshold, 250, \
2982 "min. invocation count a method needs to have to be inlined") \
2983 \
2984 develop(intx, AlignEntryCode, 4, \
2985 "aligns entry code to specified value (in bytes)") \
2986 \
2987 develop(intx, MethodHistogramCutoff, 100, \
2988 "cutoff value for method invoc. histogram (+CountCalls)") \
2989 \
2990 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2991 "# of interpreted methods to show in profile") \
2992 \
2993 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2994 "# of compiled methods to show in profile") \
2995 \
2996 develop(intx, ProfilerNumberOfStubMethods, 25, \
2997 "# of stub methods to show in profile") \
2998 \
2999 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3000 "# of runtime stub nodes to show in profile") \
3001 \
3002 product(intx, ProfileIntervalsTicks, 100, \
3003 "# of ticks between printing of interval profile " \
3004 "(+ProfileIntervals)") \
3005 \
3006 notproduct(intx, ScavengeALotInterval, 1, \
3007 "Interval between which scavenge will occur with +ScavengeALot") \
3008 \
3009 notproduct(intx, FullGCALotInterval, 1, \
3010 "Interval between which full gc will occur with +FullGCALot") \
3011 \
3012 notproduct(intx, FullGCALotStart, 0, \
3013 "For which invocation to start FullGCAlot") \
3014 \
3015 notproduct(intx, FullGCALotDummies, 32*K, \
3016 "Dummy object allocated with +FullGCALot, forcing all objects " \
3017 "to move") \
3018 \
3019 develop(intx, DontYieldALotInterval, 10, \
3020 "Interval between which yields will be dropped (milliseconds)") \
3021 \
3022 develop(intx, MinSleepInterval, 1, \
3023 "Minimum sleep() interval (milliseconds) when " \
3024 "ConvertSleepToYield is off (used for SOLARIS)") \
3025 \
3026 product(intx, EventLogLength, 2000, \
3027 "maximum nof events in event log") \
3028 \
3029 develop(intx, ProfilerPCTickThreshold, 15, \
3030 "Number of ticks in a PC buckets to be a hotspot") \
3031 \
3032 notproduct(intx, DeoptimizeALotInterval, 5, \
3033 "Number of exits until DeoptimizeALot kicks in") \
3034 \
3035 notproduct(intx, ZombieALotInterval, 5, \
3036 "Number of exits until ZombieALot kicks in") \
3037 \
3038 develop(bool, StressNonEntrant, false, \
3039 "Mark nmethods non-entrant at registration") \
3040 \
3041 diagnostic(intx, MallocVerifyInterval, 0, \
3042 "if non-zero, verify C heap after every N calls to " \
3043 "malloc/realloc/free") \
3044 \
3045 diagnostic(intx, MallocVerifyStart, 0, \
3046 "if non-zero, start verifying C heap after Nth call to " \
3047 "malloc/realloc/free") \
3048 \
3049 product(intx, TypeProfileWidth, 2, \
3050 "number of receiver types to record in call/cast profile") \
3051 \
3052 develop(intx, BciProfileWidth, 2, \
3053 "number of return bci's to record in ret profile") \
3054 \
3055 product(intx, PerMethodRecompilationCutoff, 400, \
3056 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3057 \
3058 product(intx, PerBytecodeRecompilationCutoff, 200, \
3059 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3060 \
3061 product(intx, PerMethodTrapLimit, 100, \
3062 "Limit on traps (of one kind) in a method (includes inlines)") \
3063 \
3064 product(intx, PerBytecodeTrapLimit, 4, \
3065 "Limit on traps (of one kind) at a particular BCI") \
3066 \
3067 develop(intx, FreqCountInvocations, 1, \
3068 "Scaling factor for branch frequencies (deprecated)") \
3069 \
3070 develop(intx, InlineFrequencyRatio, 20, \
3071 "Ratio of call site execution to caller method invocation") \
3072 \
3073 develop_pd(intx, InlineFrequencyCount, \
3074 "Count of call site execution necessary to trigger frequent " \
3075 "inlining") \
3076 \
3077 develop(intx, InlineThrowCount, 50, \
3078 "Force inlining of interpreted methods that throw this often") \
3079 \
3080 develop(intx, InlineThrowMaxSize, 200, \
3081 "Force inlining of throwing methods smaller than this") \
3082 \
3083 product(intx, AliasLevel, 3, \
3084 "0 for no aliasing, 1 for oop/field/static/array split, " \
3085 "2 for class split, 3 for unique instances") \
3086 \
3087 develop(bool, VerifyAliases, false, \
3088 "perform extra checks on the results of alias analysis") \
3089 \
3090 develop(intx, ProfilerNodeSize, 1024, \
3091 "Size in K to allocate for the Profile Nodes of each thread") \
3092 \
3093 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
3094 "Number of times to spin wait on a v8 atomic operation lock") \
3095 \
3096 product(intx, ReadSpinIterations, 100, \
3097 "Number of read attempts before a yield (spin inner loop)") \
3098 \
3099 product_pd(intx, PreInflateSpin, \
3100 "Number of times to spin wait before inflation") \
3101 \
3102 product(intx, PreBlockSpin, 10, \
3103 "Number of times to spin in an inflated lock before going to " \
3104 "an OS lock") \
3105 \
3106 /* gc parameters */ \
3107 product(uintx, InitialHeapSize, 0, \
3108 "Initial heap size (in bytes); zero means OldSize + NewSize") \
3109 \
3110 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3111 "Maximum heap size (in bytes)") \
3112 \
3113 product(uintx, OldSize, ScaleForWordSize(4*M), \
3114 "Initial tenured generation size (in bytes)") \
3115 \
3116 product(uintx, NewSize, ScaleForWordSize(1*M), \
3117 "Initial new generation size (in bytes)") \
3118 \
3119 product(uintx, MaxNewSize, max_uintx, \
3120 "Maximum new generation size (in bytes), max_uintx means set " \
3121 "ergonomically") \
3122 \
3123 product(uintx, PretenureSizeThreshold, 0, \
3124 "Maximum size in bytes of objects allocated in DefNew " \
3125 "generation; zero means no maximum") \
3126 \
3127 product(uintx, TLABSize, 0, \
3128 "Starting TLAB size (in bytes); zero means set ergonomically") \
3129 \
3130 product(uintx, MinTLABSize, 2*K, \
3131 "Minimum allowed TLAB size (in bytes)") \
3132 \
3133 product(uintx, TLABAllocationWeight, 35, \
3134 "Allocation averaging weight") \
3135 \
3136 product(uintx, TLABWasteTargetPercent, 1, \
3137 "Percentage of Eden that can be wasted") \
3138 \
3139 product(uintx, TLABRefillWasteFraction, 64, \
3140 "Max TLAB waste at a refill (internal fragmentation)") \
3141 \
3142 product(uintx, TLABWasteIncrement, 4, \
3143 "Increment allowed waste at slow allocation") \
3144 \
3145 product(intx, SurvivorRatio, 8, \
3146 "Ratio of eden/survivor space size") \
3147 \
3148 product(intx, NewRatio, 2, \
3149 "Ratio of new/old generation sizes") \
3150 \
3151 product_pd(uintx, NewSizeThreadIncrease, \
3152 "Additional size added to desired new generation size per " \
3153 "non-daemon thread (in bytes)") \
3154 \
3155 product_pd(uintx, PermSize, \
3156 "Initial size of permanent generation (in bytes)") \
3157 \
3158 product_pd(uintx, MaxPermSize, \
3159 "Maximum size of permanent generation (in bytes)") \
3160 \
3161 product(uintx, MinHeapFreeRatio, 40, \
3162 "Min percentage of heap free after GC to avoid expansion") \
3163 \
3164 product(uintx, MaxHeapFreeRatio, 70, \
3165 "Max percentage of heap free after GC to avoid shrinking") \
3166 \
3167 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3168 "Number of milliseconds per MB of free space in the heap") \
3169 \
3170 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3171 "Min change in heap space due to GC (in bytes)") \
3172 \
3173 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
3174 "Min expansion of permanent heap (in bytes)") \
3175 \
3176 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3177 "Max expansion of permanent heap without full GC (in bytes)") \
3178 \
3179 product(intx, QueuedAllocationWarningCount, 0, \
3180 "Number of times an allocation that queues behind a GC " \
3181 "will retry before printing a warning") \
3182 \
3183 diagnostic(uintx, VerifyGCStartAt, 0, \
3184 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3185 \
3186 diagnostic(intx, VerifyGCLevel, 0, \
3187 "Generation level at which to start +VerifyBefore/AfterGC") \
3188 \
3189 develop(uintx, ExitAfterGCNum, 0, \
3190 "If non-zero, exit after this GC.") \
3191 \
3192 product(intx, MaxTenuringThreshold, 15, \
3193 "Maximum value for tenuring threshold") \
3194 \
3195 product(intx, InitialTenuringThreshold, 7, \
3196 "Initial value for tenuring threshold") \
3197 \
3198 product(intx, TargetSurvivorRatio, 50, \
3199 "Desired percentage of survivor space used after scavenge") \
3200 \
3201 product(uintx, MarkSweepDeadRatio, 5, \
3202 "Percentage (0-100) of the old gen allowed as dead wood." \
3203 "Serial mark sweep treats this as both the min and max value." \
3204 "CMS uses this value only if it falls back to mark sweep." \
3205 "Par compact uses a variable scale based on the density of the" \
3206 "generation and treats this as the max value when the heap is" \
3207 "either completely full or completely empty. Par compact also" \
3208 "has a smaller default value; see arguments.cpp.") \
3209 \
3210 product(uintx, PermMarkSweepDeadRatio, 20, \
3211 "Percentage (0-100) of the perm gen allowed as dead wood." \
3212 "See MarkSweepDeadRatio for collector-specific comments.") \
3213 \
3214 product(intx, MarkSweepAlwaysCompactCount, 4, \
3215 "How often should we fully compact the heap (ignoring the dead " \
3216 "space parameters)") \
3217 \
3218 product(intx, PrintCMSStatistics, 0, \
3219 "Statistics for CMS") \
3220 \
3221 product(bool, PrintCMSInitiationStatistics, false, \
3222 "Statistics for initiating a CMS collection") \
3223 \
3224 product(intx, PrintFLSStatistics, 0, \
3225 "Statistics for CMS' FreeListSpace") \
3226 \
3227 product(intx, PrintFLSCensus, 0, \
3228 "Census for CMS' FreeListSpace") \
3229 \
3230 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3231 "Delay in ms between expansion and allocation") \
3232 \
3233 product(intx, DeferThrSuspendLoopCount, 4000, \
3234 "(Unstable) Number of times to iterate in safepoint loop " \
3235 " before blocking VM threads ") \
3236 \
3237 product(intx, DeferPollingPageLoopCount, -1, \
3238 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3239 "before changing safepoint polling page to RO ") \
3240 \
3241 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3242 \
3243 product(bool, PSChunkLargeArrays, true, \
3244 "true: process large arrays in chunks") \
3245 \
3246 product(uintx, GCDrainStackTargetSize, 64, \
3247 "how many entries we'll try to leave on the stack during " \
3248 "parallel GC") \
3249 \
3250 /* stack parameters */ \
3251 product_pd(intx, StackYellowPages, \
3252 "Number of yellow zone (recoverable overflows) pages") \
3253 \
3254 product_pd(intx, StackRedPages, \
3255 "Number of red zone (unrecoverable overflows) pages") \
3256 \
3257 product_pd(intx, StackShadowPages, \
3258 "Number of shadow zone (for overflow checking) pages" \
3259 " this should exceed the depth of the VM and native call stack") \
3260 \
3261 product_pd(intx, ThreadStackSize, \
3262 "Thread Stack Size (in Kbytes)") \
3263 \
3264 product_pd(intx, VMThreadStackSize, \
3265 "Non-Java Thread Stack Size (in Kbytes)") \
3266 \
3267 product_pd(intx, CompilerThreadStackSize, \
3268 "Compiler Thread Stack Size (in Kbytes)") \
3269 \
3270 develop_pd(uintx, JVMInvokeMethodSlack, \
3271 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3272 \
3273 product(uintx, ThreadSafetyMargin, 50*M, \
3274 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3275 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3276 "disable this feature") \
3277 \
3278 /* code cache parameters */ \
3279 develop(uintx, CodeCacheSegmentSize, 64, \
3280 "Code cache segment size (in bytes) - smallest unit of " \
3281 "allocation") \
3282 \
3283 develop_pd(intx, CodeEntryAlignment, \
3284 "Code entry alignment for generated code (in bytes)") \
3285 \
3286 product_pd(intx, OptoLoopAlignment, \
3287 "Align inner loops to zero relative to this modulus") \
3288 \
3289 product_pd(uintx, InitialCodeCacheSize, \
3290 "Initial code cache size (in bytes)") \
3291 \
3292 product_pd(uintx, ReservedCodeCacheSize, \
3293 "Reserved code cache size (in bytes) - maximum code cache size") \
3294 \
3295 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3296 "When less than X space left, we stop compiling.") \
3297 \
3298 product_pd(uintx, CodeCacheExpansionSize, \
3299 "Code cache expansion size (in bytes)") \
3300 \
3301 develop_pd(uintx, CodeCacheMinBlockLength, \
3302 "Minimum number of segments in a code cache block.") \
3303 \
3304 notproduct(bool, ExitOnFullCodeCache, false, \
3305 "Exit the VM if we fill the code cache.") \
3306 \
3307 product(bool, UseCodeCacheFlushing, false, \
3308 "Attempt to clean the code cache before shutting off compiler") \
3309 \
3310 product(intx, MinCodeCacheFlushingInterval, 30, \
3311 "Min number of seconds between code cache cleaning sessions") \
3312 \
3313 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3314 "When less than X space left, start code cache cleaning") \
3315 \
3316 /* interpreter debugging */ \
3317 develop(intx, BinarySwitchThreshold, 5, \
3318 "Minimal number of lookupswitch entries for rewriting to binary " \
3319 "switch") \
3320 \
3321 develop(intx, StopInterpreterAt, 0, \
3322 "Stops interpreter execution at specified bytecode number") \
3323 \
3324 develop(intx, TraceBytecodesAt, 0, \
3325 "Traces bytecodes starting with specified bytecode number") \
3326 \
3327 /* compiler interface */ \
3328 develop(intx, CIStart, 0, \
3329 "the id of the first compilation to permit") \
3330 \
3331 develop(intx, CIStop, -1, \
3332 "the id of the last compilation to permit") \
3333 \
3334 develop(intx, CIStartOSR, 0, \
3335 "the id of the first osr compilation to permit " \
3336 "(CICountOSR must be on)") \
3337 \
3338 develop(intx, CIStopOSR, -1, \
3339 "the id of the last osr compilation to permit " \
3340 "(CICountOSR must be on)") \
3341 \
3342 develop(intx, CIBreakAtOSR, -1, \
3343 "id of osr compilation to break at") \
3344 \
3345 develop(intx, CIBreakAt, -1, \
3346 "id of compilation to break at") \
3347 \
3348 product(ccstrlist, CompileOnly, "", \
3349 "List of methods (pkg/class.name) to restrict compilation to") \
3350 \
3351 product(ccstr, CompileCommandFile, NULL, \
3352 "Read compiler commands from this file [.hotspot_compiler]") \
3353 \
3354 product(ccstrlist, CompileCommand, "", \
3355 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3356 \
3357 product(bool, CICompilerCountPerCPU, false, \
3358 "1 compiler thread for log(N CPUs)") \
3359 \
3360 develop(intx, CIFireOOMAt, -1, \
3361 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3362 "(non-negative value throws OOM after this many CI accesses " \
3363 "in each compile)") \
3364 \
3365 develop(intx, CIFireOOMAtDelay, -1, \
3366 "Wait for this many CI accesses to occur in all compiles before " \
3367 "beginning to throw OutOfMemoryErrors in each compile") \
3368 \
3369 notproduct(bool, CIObjectFactoryVerify, false, \
3370 "enable potentially expensive verification in ciObjectFactory") \
3371 \
3372 /* Priorities */ \
3373 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3374 \
3375 product(intx, ThreadPriorityPolicy, 0, \
3376 "0 : Normal. "\
3377 " VM chooses priorities that are appropriate for normal "\
3378 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3379 " to normal native priority. Java priorities below NORM_PRIORITY"\
3380 " map to lower native priority values. On Windows applications"\
3381 " are allowed to use higher native priorities. However, with "\
3382 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3383 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3384 " interfere with system threads. On Linux thread priorities "\
3385 " are ignored because the OS does not support static priority "\
3386 " in SCHED_OTHER scheduling class which is the only choice for"\
3387 " non-root, non-realtime applications. "\
3388 "1 : Aggressive. "\
3389 " Java thread priorities map over to the entire range of "\
3390 " native thread priorities. Higher Java thread priorities map "\
3391 " to higher native thread priorities. This policy should be "\
3392 " used with care, as sometimes it can cause performance "\
3393 " degradation in the application and/or the entire system. On "\
3394 " Linux this policy requires root privilege.") \
3395 \
3396 product(bool, ThreadPriorityVerbose, false, \
3397 "print priority changes") \
3398 \
3399 product(intx, DefaultThreadPriority, -1, \
3400 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3401 \
3402 product(intx, CompilerThreadPriority, -1, \
3403 "what priority should compiler threads run at (-1 means no change)") \
3404 \
3405 product(intx, VMThreadPriority, -1, \
3406 "what priority should VM threads run at (-1 means no change)") \
3407 \
3408 product(bool, CompilerThreadHintNoPreempt, true, \
3409 "(Solaris only) Give compiler threads an extra quanta") \
3410 \
3411 product(bool, VMThreadHintNoPreempt, false, \
3412 "(Solaris only) Give VM thread an extra quanta") \
3413 \
3414 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3415 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3416 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3417 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3418 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3419 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3420 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3421 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3422 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3423 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3424 \
3425 /* compiler debugging */ \
3426 notproduct(intx, CompileTheWorldStartAt, 1, \
3427 "First class to consider when using +CompileTheWorld") \
3428 \
3429 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3430 "Last class to consider when using +CompileTheWorld") \
3431 \
3432 develop(intx, NewCodeParameter, 0, \
3433 "Testing Only: Create a dedicated integer parameter before " \
3434 "putback") \
3435 \
3436 /* new oopmap storage allocation */ \
3437 develop(intx, MinOopMapAllocation, 8, \
3438 "Minimum number of OopMap entries in an OopMapSet") \
3439 \
3440 /* Background Compilation */ \
3441 develop(intx, LongCompileThreshold, 50, \
3442 "Used with +TraceLongCompiles") \
3443 \
3444 product(intx, StarvationMonitorInterval, 200, \
3445 "Pause between each check in ms") \
3446 \
3447 /* recompilation */ \
3448 product_pd(intx, CompileThreshold, \
3449 "number of interpreted method invocations before (re-)compiling") \
3450 \
3451 product_pd(intx, BackEdgeThreshold, \
3452 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3453 \
3454 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3455 "Interpreter (tier 0) invocation notification frequency.") \
3456 \
3457 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3458 "C1 without MDO (tier 2) invocation notification frequency.") \
3459 \
3460 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3461 "C1 with MDO profiling (tier 3) invocation notification " \
3462 "frequency.") \
3463 \
3464 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3465 "Interpreter (tier 0) invocation notification frequency.") \
3466 \
3467 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3468 "C1 without MDO (tier 2) invocation notification frequency.") \
3469 \
3470 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3471 "C1 with MDO profiling (tier 3) invocation notification " \
3472 "frequency.") \
3473 \
3474 product(intx, Tier2CompileThreshold, 0, \
3475 "threshold at which tier 2 compilation is invoked") \
3476 \
3477 product(intx, Tier2BackEdgeThreshold, 0, \
3478 "Back edge threshold at which tier 2 compilation is invoked") \
3479 \
3480 product(intx, Tier3InvocationThreshold, 200, \
3481 "Compile if number of method invocations crosses this " \
3482 "threshold") \
3483 \
3484 product(intx, Tier3MinInvocationThreshold, 100, \
3485 "Minimum invocation to compile at tier 3") \
3486 \
3487 product(intx, Tier3CompileThreshold, 2000, \
3488 "Threshold at which tier 3 compilation is invoked (invocation " \
3489 "minimum must be satisfied.") \
3490 \
3491 product(intx, Tier3BackEdgeThreshold, 7000, \
3492 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3493 \
3494 product(intx, Tier4InvocationThreshold, 5000, \
3495 "Compile if number of method invocations crosses this " \
3496 "threshold") \
3497 \
3498 product(intx, Tier4MinInvocationThreshold, 600, \
3499 "Minimum invocation to compile at tier 4") \
3500 \
3501 product(intx, Tier4CompileThreshold, 15000, \
3502 "Threshold at which tier 4 compilation is invoked (invocation " \
3503 "minimum must be satisfied.") \
3504 \
3505 product(intx, Tier4BackEdgeThreshold, 40000, \
3506 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3507 \
3508 product(intx, Tier3DelayOn, 5, \
3509 "If C2 queue size grows over this amount per compiler thread " \
3510 "stop compiling at tier 3 and start compiling at tier 2") \
3511 \
3512 product(intx, Tier3DelayOff, 2, \
3513 "If C2 queue size is less than this amount per compiler thread " \
3514 "allow methods compiled at tier 2 transition to tier 3") \
3515 \
3516 product(intx, Tier3LoadFeedback, 5, \
3517 "Tier 3 thresholds will increase twofold when C1 queue size " \
3518 "reaches this amount per compiler thread") \
3519 \
3520 product(intx, Tier4LoadFeedback, 3, \
3521 "Tier 4 thresholds will increase twofold when C2 queue size " \
3522 "reaches this amount per compiler thread") \
3523 \
3524 product(intx, TieredCompileTaskTimeout, 50, \
3525 "Kill compile task if method was not used within " \
3526 "given timeout in milliseconds") \
3527 \
3528 product(intx, TieredStopAtLevel, 4, \
3529 "Stop at given compilation level") \
3530 \
3531 product(intx, Tier0ProfilingStartPercentage, 200, \
3532 "Start profiling in interpreter if the counters exceed tier 3" \
3533 "thresholds by the specified percentage") \
3534 \
3535 product(intx, TieredRateUpdateMinTime, 1, \
3536 "Minimum rate sampling interval (in milliseconds)") \
3537 \
3538 product(intx, TieredRateUpdateMaxTime, 25, \
3539 "Maximum rate sampling interval (in milliseconds)") \
3540 \
3541 product_pd(bool, TieredCompilation, \
3542 "Enable tiered compilation") \
3543 \
3544 product(bool, PrintTieredEvents, false, \
3545 "Print tiered events notifications") \
3546 \
3547 product(bool, StressTieredRuntime, false, \
3548 "Alternate client and server compiler on compile requests") \
3549 \
3550 product_pd(intx, OnStackReplacePercentage, \
3551 "NON_TIERED number of method invocations/branches (expressed as %"\
3552 "of CompileThreshold) before (re-)compiling OSR code") \
3553 \
3554 product(intx, InterpreterProfilePercentage, 33, \
3555 "NON_TIERED number of method invocations/branches (expressed as %"\
3556 "of CompileThreshold) before profiling in the interpreter") \
3557 \
3558 develop(intx, MaxRecompilationSearchLength, 10, \
3559 "max. # frames to inspect searching for recompilee") \
3560 \
3561 develop(intx, MaxInterpretedSearchLength, 3, \
3562 "max. # interp. frames to skip when searching for recompilee") \
3563 \
3564 develop(intx, DesiredMethodLimit, 8000, \
3565 "desired max. method size (in bytecodes) after inlining") \
3566 \
3567 develop(intx, HugeMethodLimit, 8000, \
3568 "don't compile methods larger than this if " \
3569 "+DontCompileHugeMethods") \
3570 \
3571 /* New JDK 1.4 reflection implementation */ \
3572 \
3573 develop(bool, UseNewReflection, true, \
3574 "Temporary flag for transition to reflection based on dynamic " \
3575 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3576 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3577 "changes were needed") \
3578 \
3579 develop(bool, VerifyReflectionBytecodes, false, \
3580 "Force verification of 1.4 reflection bytecodes. Does not work " \
3581 "in situations like that described in 4486457 or for " \
3582 "constructors generated for serialization, so can not be enabled "\
3583 "in product.") \
3584 \
3585 product(bool, ReflectionWrapResolutionErrors, true, \
3586 "Temporary flag for transition to AbstractMethodError wrapped " \
3587 "in InvocationTargetException. See 6531596") \
3588 \
3589 \
3590 develop(intx, FastSuperclassLimit, 8, \
3591 "Depth of hardwired instanceof accelerator array") \
3592 \
3593 /* Properties for Java libraries */ \
3594 \
3595 product(intx, MaxDirectMemorySize, -1, \
3596 "Maximum total size of NIO direct-buffer allocations") \
3597 \
3598 /* temporary developer defined flags */ \
3599 \
3600 diagnostic(bool, UseNewCode, false, \
3601 "Testing Only: Use the new version while testing") \
3602 \
3603 diagnostic(bool, UseNewCode2, false, \
3604 "Testing Only: Use the new version while testing") \
3605 \
3606 diagnostic(bool, UseNewCode3, false, \
3607 "Testing Only: Use the new version while testing") \
3608 \
3609 /* flags for performance data collection */ \
3610 \
3611 NOT_EMBEDDED(product(bool, UsePerfData, true, \
3612 "Flag to disable jvmstat instrumentation for performance testing" \
3613 "and problem isolation purposes.")) \
3614 \
3615 EMBEDDED_ONLY(product(bool, UsePerfData, false, \
3616 "Flag to disable jvmstat instrumentation for performance testing" \
3617 "and problem isolation purposes.")) \
3618 \
3619 product(bool, PerfDataSaveToFile, false, \
3620 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3621 \
3622 product(ccstr, PerfDataSaveFile, NULL, \
3623 "Save PerfData memory to the specified absolute pathname," \
3624 "%p in the file name if present will be replaced by pid") \
3625 \
3626 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3627 "Data sampling interval in milliseconds") \
3628 \
3629 develop(bool, PerfTraceDataCreation, false, \
3630 "Trace creation of Performance Data Entries") \
3631 \
3632 develop(bool, PerfTraceMemOps, false, \
3633 "Trace PerfMemory create/attach/detach calls") \
3634 \
3635 product(bool, PerfDisableSharedMem, false, \
3636 "Store performance data in standard memory") \
3637 \
3638 product(intx, PerfDataMemorySize, 32*K, \
3639 "Size of performance data memory region. Will be rounded " \
3640 "up to a multiple of the native os page size.") \
3641 \
3642 product(intx, PerfMaxStringConstLength, 1024, \
3643 "Maximum PerfStringConstant string length before truncation") \
3644 \
3645 product(bool, PerfAllowAtExitRegistration, false, \
3646 "Allow registration of atexit() methods") \
3647 \
3648 product(bool, PerfBypassFileSystemCheck, false, \
3649 "Bypass Win32 file system criteria checks (Windows Only)") \
3650 \
3651 product(intx, UnguardOnExecutionViolation, 0, \
3652 "Unguard page and retry on no-execute fault (Win32 only)" \
3653 "0=off, 1=conservative, 2=aggressive") \
3654 \
3655 /* Serviceability Support */ \
3656 \
3657 product(bool, ManagementServer, false, \
3658 "Create JMX Management Server") \
3659 \
3660 product(bool, DisableAttachMechanism, false, \
3661 "Disable mechanism that allows tools to attach to this VM") \
3662 \
3663 product(bool, StartAttachListener, false, \
3664 "Always start Attach Listener at VM startup") \
3665 \
3666 manageable(bool, PrintConcurrentLocks, false, \
3667 "Print java.util.concurrent locks in thread dump") \
3668 \
3669 product(bool, TransmitErrorReport, false, \
3670 "Enable error report transmission on erroneous termination") \
3671 \
3672 product(ccstr, ErrorReportServer, NULL, \
3673 "Override built-in error report server address") \
3674 \
3675 /* Shared spaces */ \
3676 \
3677 product(bool, UseSharedSpaces, true, \
3678 "Use shared spaces in the permanent generation") \
3679 \
3680 product(bool, RequireSharedSpaces, false, \
3681 "Require shared spaces in the permanent generation") \
3682 \
3683 product(bool, ForceSharedSpaces, false, \
3684 "Require shared spaces in the permanent generation") \
3685 \
3686 product(bool, DumpSharedSpaces, false, \
3687 "Special mode: JVM reads a class list, loads classes, builds " \
3688 "shared spaces, and dumps the shared spaces to a file to be " \
3689 "used in future JVM runs.") \
3690 \
3691 product(bool, PrintSharedSpaces, false, \
3692 "Print usage of shared spaces") \
3693 \
3694 product(uintx, SharedDummyBlockSize, 512*M, \
3695 "Size of dummy block used to shift heap addresses (in bytes)") \
3696 \
3697 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \
3698 "Size of read-write space in permanent generation (in bytes)") \
3699 \
3700 product(uintx, SharedReadOnlySize, 10*M, \
3701 "Size of read-only space in permanent generation (in bytes)") \
3702 \
3703 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \
3704 "Size of the shared data area adjacent to the heap (in bytes)") \
3705 \
3706 product(uintx, SharedMiscCodeSize, 4*M, \
3707 "Size of the shared code area adjacent to the heap (in bytes)") \
3708 \
3709 diagnostic(bool, SharedOptimizeColdStart, true, \
3710 "At dump time, order shared objects to achieve better " \
3711 "cold startup time.") \
3712 \
3713 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3714 "Reordering policy for SharedOptimizeColdStart " \
3715 "0=favor classload-time locality, 1=balanced, " \
3716 "2=favor runtime locality") \
3717 \
3718 diagnostic(bool, SharedSkipVerify, false, \
3719 "Skip assert() and verify() which page-in unwanted shared " \
3720 "objects. ") \
3721 \
3722 product(bool, AnonymousClasses, false, \
3723 "support sun.misc.Unsafe.defineAnonymousClass") \
3724 \
3725 experimental(bool, EnableMethodHandles, false, \
3726 "support method handles (true by default under JSR 292)") \
3727 \
3728 diagnostic(intx, MethodHandlePushLimit, 3, \
3729 "number of additional stack slots a method handle may push") \
3730 \
3731 develop(bool, TraceMethodHandles, false, \
3732 "trace internal method handle operations") \
3733 \
3734 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3735 "perform extra checks when constructing method handles") \
3736 \
3737 diagnostic(bool, OptimizeMethodHandles, true, \
3738 "when constructing method handles, try to improve them") \
3739 \
3740 experimental(bool, TrustFinalNonStaticFields, false, \
3741 "trust final non-static declarations for constant folding") \
3742 \
3743 experimental(bool, EnableInvokeDynamic, false, \
3744 "recognize the invokedynamic instruction") \
3745 \
3746 experimental(bool, AllowTransitionalJSR292, true, \
3747 "recognize pre-PFD formats of invokedynamic") \
3748 \
3749 develop(bool, TraceInvokeDynamic, false, \
3750 "trace internal invoke dynamic operations") \
3751 \
3752 diagnostic(bool, PauseAtStartup, false, \
3753 "Causes the VM to pause at startup time and wait for the pause " \
3754 "file to be removed (default: ./vm.paused.<pid>)") \
3755 \
3756 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3757 "The file to create and for whose removal to await when pausing " \
3758 "at startup. (default: ./vm.paused.<pid>)") \
3759 \
3760 product(bool, ExtendedDTraceProbes, false, \
3761 "Enable performance-impacting dtrace probes") \
3762 \
3763 product(bool, DTraceMethodProbes, false, \
3764 "Enable dtrace probes for method-entry and method-exit") \
3765 \
3766 product(bool, DTraceAllocProbes, false, \
3767 "Enable dtrace probes for object allocation") \
3768 \
3769 product(bool, DTraceMonitorProbes, false, \
3770 "Enable dtrace probes for monitor events") \
3771 \
3772 product(bool, RelaxAccessControlCheck, false, \
3773 "Relax the access control checks in the verifier") \
3774 \
3775 diagnostic(bool, PrintDTraceDOF, false, \
3776 "Print the DTrace DOF passed to the system for JSDT probes") \
3777 \
3778 product(bool, UseVMInterruptibleIO, false, \
3779 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3780 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3781 " of this flag is true for JDK 6 and earliers")
3782
3783 /*
3784 * Macros for factoring of globals
3785 */
3786
3787 // Interface macros
3788 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3789 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3790 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3791 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3792 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3793 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3794 #ifdef PRODUCT
3795 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3796 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3797 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3798 #else
3799 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3800 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3801 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3802 #endif
3803 // Special LP64 flags, product only needed for now.
3804 #ifdef _LP64
3805 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3806 #else
3807 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3808 #endif // _LP64
3809
3810 // Implementation macros
3811 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3812 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3813 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3814 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3815 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3816 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3817 #ifdef PRODUCT
3818 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3819 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3820 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3821 #else
3822 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3823 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3824 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3825 #endif
3826 #ifdef _LP64
3827 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3828 #else
3829 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3830 #endif // _LP64
3831
3832 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)
3833
3834 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3835
3836 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP