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src/share/vm/runtime/globals.hpp@d968f546734e
src/share/vm/runtime/globals.hpp
Wed, 07 Sep 2011 11:52:00 -0700
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- iveresov
- date
- Wed, 07 Sep 2011 11:52:00 -0700
- changeset 3110
- d968f546734e
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- 3cd0157e1d4d
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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 */
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
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
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);
138 define_pd_global(intx, CompileThreshold, 0);
139 define_pd_global(intx, BackEdgeThreshold, 0);
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
159 #ifdef COMPILER2
160 #define CI_COMPILER_COUNT 2
161 #else
162 #define CI_COMPILER_COUNT 1
163 #endif // COMPILER2
165 #endif // no compilers
168 // string type aliases used only in this file
169 typedef const char* ccstr;
170 typedef const char* ccstrlist; // represents string arguments which accumulate
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 };
183 struct Flag {
184 const char *type;
185 const char *name;
186 void* addr;
188 NOT_PRODUCT(const char *doc;)
190 const char *kind;
191 FlagValueOrigin origin;
193 // points to all Flags static array
194 static Flag *flags;
196 // number of flags
197 static size_t numFlags;
199 static Flag* find_flag(char* name, size_t length);
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; }
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; }
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; }
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; }
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; }
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; }
226 bool is_unlocker() const;
227 bool is_unlocked() const;
228 bool is_writeable() const;
229 bool is_external() const;
231 void print_on(outputStream* st, bool withComments = false );
232 void print_as_flag(outputStream* st);
233 };
235 // debug flags control various aspects of the VM and are global accessible
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 };
249 class CounterSetting {
250 intx* counter;
251 public:
252 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
253 ~CounterSetting() { (*counter)--; }
254 };
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 };
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 };
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); }
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); }
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); }
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); }
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); }
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); }
307 // Returns false if name is not a command line flag.
308 static bool wasSetOnCmdline(const char* name, bool* value);
309 static void printSetFlags();
311 static void printFlags(bool withComments = false );
313 static void verify() PRODUCT_RETURN;
314 };
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
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
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
346 #ifdef JAVASE_EMBEDDED
347 #define falseInEmbedded false
348 #else
349 #define falseInEmbedded true
350 #endif
352 // develop flags are settable / visible only during development and are constant in the PRODUCT version
353 // product flags are always settable / visible
354 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
356 // A flag must be declared with one of the following types:
357 // bool, intx, uintx, ccstr.
358 // The type "ccstr" is an alias for "const char*" and is used
359 // only in this file, because the macrology requires single-token type names.
361 // Note: Diagnostic options not meant for VM tuning or for product modes.
362 // They are to be used for VM quality assurance or field diagnosis
363 // of VM bugs. They are hidden so that users will not be encouraged to
364 // try them as if they were VM ordinary execution options. However, they
365 // are available in the product version of the VM. Under instruction
366 // from support engineers, VM customers can turn them on to collect
367 // diagnostic information about VM problems. To use a VM diagnostic
368 // option, you must first specify +UnlockDiagnosticVMOptions.
369 // (This master switch also affects the behavior of -Xprintflags.)
370 //
371 // experimental flags are in support of features that are not
372 // part of the officially supported product, but are available
373 // for experimenting with. They could, for example, be performance
374 // features that may not have undergone full or rigorous QA, but which may
375 // help performance in some cases and released for experimentation
376 // by the community of users and developers. This flag also allows one to
377 // be able to build a fully supported product that nonetheless also
378 // ships with some unsupported, lightly tested, experimental features.
379 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
380 // UnlockExperimentalVMOptions flag, which allows the control and
381 // modification of the experimental flags.
382 //
383 // Nota bene: neither diagnostic nor experimental options should be used casually,
384 // and they are not supported on production loads, except under explicit
385 // direction from support engineers.
386 //
387 // manageable flags are writeable external product flags.
388 // They are dynamically writeable through the JDK management interface
389 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
390 // These flags are external exported interface (see CCC). The list of
391 // manageable flags can be queried programmatically through the management
392 // interface.
393 //
394 // A flag can be made as "manageable" only if
395 // - the flag is defined in a CCC as an external exported interface.
396 // - the VM implementation supports dynamic setting of the flag.
397 // This implies that the VM must *always* query the flag variable
398 // and not reuse state related to the flag state at any given time.
399 // - you want the flag to be queried programmatically by the customers.
400 //
401 // product_rw flags are writeable internal product flags.
402 // They are like "manageable" flags but for internal/private use.
403 // The list of product_rw flags are internal/private flags which
404 // may be changed/removed in a future release. It can be set
405 // through the management interface to get/set value
406 // when the name of flag is supplied.
407 //
408 // A flag can be made as "product_rw" only if
409 // - the VM implementation supports dynamic setting of the flag.
410 // This implies that the VM must *always* query the flag variable
411 // and not reuse state related to the flag state at any given time.
412 //
413 // Note that when there is a need to support develop flags to be writeable,
414 // it can be done in the same way as product_rw.
416 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
417 \
418 lp64_product(bool, UseCompressedOops, false, \
419 "Use 32-bit object references in 64-bit VM. " \
420 "lp64_product means flag is always constant in 32 bit VM") \
421 \
422 notproduct(bool, CheckCompressedOops, true, \
423 "generate checks in encoding/decoding code in debug VM") \
424 \
425 product_pd(uintx, HeapBaseMinAddress, \
426 "OS specific low limit for heap base address") \
427 \
428 diagnostic(bool, PrintCompressedOopsMode, false, \
429 "Print compressed oops base address and encoding mode") \
430 \
431 lp64_product(intx, ObjectAlignmentInBytes, 8, \
432 "Default object alignment in bytes, 8 is minimum") \
433 \
434 /* UseMembar is theoretically a temp flag used for memory barrier \
435 * removal testing. It was supposed to be removed before FCS but has \
436 * been re-added (see 6401008) */ \
437 product_pd(bool, UseMembar, \
438 "(Unstable) Issues membars on thread state transitions") \
439 \
440 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
441 * that don't support it. This will be replaced by processor detection \
442 * logic. \
443 */ \
444 product(bool, UsePPCLWSYNC, true, \
445 "Use lwsync instruction if true, else use slower sync") \
446 \
447 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
448 "Whether to clean the chunk pool asynchronously") \
449 \
450 /* Temporary: See 6948537 */ \
451 experimental(bool, UseMemSetInBOT, true, \
452 "(Unstable) uses memset in BOT updates in GC code") \
453 \
454 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
455 "Enable normal processing of flags relating to field diagnostics")\
456 \
457 experimental(bool, UnlockExperimentalVMOptions, false, \
458 "Enable normal processing of flags relating to experimental features")\
459 \
460 product(bool, JavaMonitorsInStackTrace, true, \
461 "Print info. about Java monitor locks when the stacks are dumped")\
462 \
463 product_pd(bool, UseLargePages, \
464 "Use large page memory") \
465 \
466 product_pd(bool, UseLargePagesIndividualAllocation, \
467 "Allocate large pages individually for better affinity") \
468 \
469 develop(bool, LargePagesIndividualAllocationInjectError, false, \
470 "Fail large pages individual allocation") \
471 \
472 develop(bool, TracePageSizes, false, \
473 "Trace page size selection and usage.") \
474 \
475 product(bool, UseNUMA, false, \
476 "Use NUMA if available") \
477 \
478 product(bool, UseNUMAInterleaving, false, \
479 "Interleave memory across NUMA nodes if available") \
480 \
481 product(uintx, NUMAInterleaveGranularity, 2*M, \
482 "Granularity to use for NUMA interleaving on Windows OS") \
483 \
484 product(bool, ForceNUMA, false, \
485 "Force NUMA optimizations on single-node/UMA systems") \
486 \
487 product(intx, NUMAChunkResizeWeight, 20, \
488 "Percentage (0-100) used to weight the current sample when " \
489 "computing exponentially decaying average for " \
490 "AdaptiveNUMAChunkSizing") \
491 \
492 product(intx, NUMASpaceResizeRate, 1*G, \
493 "Do not reallocate more that this amount per collection") \
494 \
495 product(bool, UseAdaptiveNUMAChunkSizing, true, \
496 "Enable adaptive chunk sizing for NUMA") \
497 \
498 product(bool, NUMAStats, false, \
499 "Print NUMA stats in detailed heap information") \
500 \
501 product(intx, NUMAPageScanRate, 256, \
502 "Maximum number of pages to include in the page scan procedure") \
503 \
504 product_pd(bool, NeedsDeoptSuspend, \
505 "True for register window machines (sparc/ia64)") \
506 \
507 product(intx, UseSSE, 99, \
508 "Highest supported SSE instructions set on x86/x64") \
509 \
510 product(intx, UseVIS, 99, \
511 "Highest supported VIS instructions set on Sparc") \
512 \
513 product(uintx, LargePageSizeInBytes, 0, \
514 "Large page size (0 to let VM choose the page size") \
515 \
516 product(uintx, LargePageHeapSizeThreshold, 128*M, \
517 "Use large pages if max heap is at least this big") \
518 \
519 product(bool, ForceTimeHighResolution, false, \
520 "Using high time resolution(For Win32 only)") \
521 \
522 develop(bool, TraceItables, false, \
523 "Trace initialization and use of itables") \
524 \
525 develop(bool, TracePcPatching, false, \
526 "Trace usage of frame::patch_pc") \
527 \
528 develop(bool, TraceJumps, false, \
529 "Trace assembly jumps in thread ring buffer") \
530 \
531 develop(bool, TraceRelocator, false, \
532 "Trace the bytecode relocator") \
533 \
534 develop(bool, TraceLongCompiles, false, \
535 "Print out every time compilation is longer than " \
536 "a given threashold") \
537 \
538 develop(bool, SafepointALot, false, \
539 "Generates a lot of safepoints. Works with " \
540 "GuaranteedSafepointInterval") \
541 \
542 product_pd(bool, BackgroundCompilation, \
543 "A thread requesting compilation is not blocked during " \
544 "compilation") \
545 \
546 product(bool, PrintVMQWaitTime, false, \
547 "Prints out the waiting time in VM operation queue") \
548 \
549 develop(bool, BailoutToInterpreterForThrows, false, \
550 "Compiled methods which throws/catches exceptions will be " \
551 "deopt and intp.") \
552 \
553 develop(bool, NoYieldsInMicrolock, false, \
554 "Disable yields in microlock") \
555 \
556 develop(bool, TraceOopMapGeneration, false, \
557 "Shows oopmap generation") \
558 \
559 product(bool, MethodFlushing, true, \
560 "Reclamation of zombie and not-entrant methods") \
561 \
562 develop(bool, VerifyStack, false, \
563 "Verify stack of each thread when it is entering a runtime call") \
564 \
565 develop(bool, ForceUnreachable, false, \
566 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
567 \
568 notproduct(bool, StressDerivedPointers, false, \
569 "Force scavenge when a derived pointers is detected on stack " \
570 "after rtm call") \
571 \
572 develop(bool, TraceDerivedPointers, false, \
573 "Trace traversal of derived pointers on stack") \
574 \
575 notproduct(bool, TraceCodeBlobStacks, false, \
576 "Trace stack-walk of codeblobs") \
577 \
578 product(bool, PrintJNIResolving, false, \
579 "Used to implement -v:jni") \
580 \
581 notproduct(bool, PrintRewrites, false, \
582 "Print methods that are being rewritten") \
583 \
584 product(bool, UseInlineCaches, true, \
585 "Use Inline Caches for virtual calls ") \
586 \
587 develop(bool, InlineArrayCopy, true, \
588 "inline arraycopy native that is known to be part of " \
589 "base library DLL") \
590 \
591 develop(bool, InlineObjectHash, true, \
592 "inline Object::hashCode() native that is known to be part " \
593 "of base library DLL") \
594 \
595 develop(bool, InlineObjectCopy, true, \
596 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
597 \
598 develop(bool, InlineNatives, true, \
599 "inline natives that are known to be part of base library DLL") \
600 \
601 develop(bool, InlineMathNatives, true, \
602 "inline SinD, CosD, etc.") \
603 \
604 develop(bool, InlineClassNatives, true, \
605 "inline Class.isInstance, etc") \
606 \
607 develop(bool, InlineAtomicLong, true, \
608 "inline sun.misc.AtomicLong") \
609 \
610 develop(bool, InlineThreadNatives, true, \
611 "inline Thread.currentThread, etc") \
612 \
613 develop(bool, InlineReflectionGetCallerClass, true, \
614 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
615 "of base library DLL") \
616 \
617 develop(bool, InlineUnsafeOps, true, \
618 "inline memory ops (native methods) from sun.misc.Unsafe") \
619 \
620 develop(bool, ConvertCmpD2CmpF, true, \
621 "Convert cmpD to cmpF when one input is constant in float range") \
622 \
623 develop(bool, ConvertFloat2IntClipping, true, \
624 "Convert float2int clipping idiom to integer clipping") \
625 \
626 develop(bool, SpecialStringCompareTo, true, \
627 "special version of string compareTo") \
628 \
629 develop(bool, SpecialStringIndexOf, true, \
630 "special version of string indexOf") \
631 \
632 develop(bool, SpecialStringEquals, true, \
633 "special version of string equals") \
634 \
635 develop(bool, SpecialArraysEquals, true, \
636 "special version of Arrays.equals(char[],char[])") \
637 \
638 product(bool, UseSSE42Intrinsics, false, \
639 "SSE4.2 versions of intrinsics") \
640 \
641 product(bool, UseCondCardMark, false, \
642 "Check for already marked card before updating card table") \
643 \
644 develop(bool, TraceCallFixup, false, \
645 "traces all call fixups") \
646 \
647 develop(bool, DeoptimizeALot, false, \
648 "deoptimize at every exit from the runtime system") \
649 \
650 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
651 "a comma separated list of bcis to deoptimize at") \
652 \
653 product(bool, DeoptimizeRandom, false, \
654 "deoptimize random frames on random exit from the runtime system")\
655 \
656 notproduct(bool, ZombieALot, false, \
657 "creates zombies (non-entrant) at exit from the runt. system") \
658 \
659 product(bool, UnlinkSymbolsALot, false, \
660 "unlink unreferenced symbols from the symbol table at safepoints")\
661 \
662 notproduct(bool, WalkStackALot, false, \
663 "trace stack (no print) at every exit from the runtime system") \
664 \
665 develop(bool, Debugging, false, \
666 "set when executing debug methods in debug.ccp " \
667 "(to prevent triggering assertions)") \
668 \
669 notproduct(bool, StrictSafepointChecks, trueInDebug, \
670 "Enable strict checks that safepoints cannot happen for threads " \
671 "that used No_Safepoint_Verifier") \
672 \
673 notproduct(bool, VerifyLastFrame, false, \
674 "Verify oops on last frame on entry to VM") \
675 \
676 develop(bool, TraceHandleAllocation, false, \
677 "Prints out warnings when suspicious many handles are allocated") \
678 \
679 product(bool, UseCompilerSafepoints, true, \
680 "Stop at safepoints in compiled code") \
681 \
682 product(bool, UseSplitVerifier, true, \
683 "use split verifier with StackMapTable attributes") \
684 \
685 product(bool, FailOverToOldVerifier, true, \
686 "fail over to old verifier when split verifier fails") \
687 \
688 develop(bool, ShowSafepointMsgs, false, \
689 "Show msg. about safepoint synch.") \
690 \
691 product(bool, SafepointTimeout, false, \
692 "Time out and warn or fail after SafepointTimeoutDelay " \
693 "milliseconds if failed to reach safepoint") \
694 \
695 develop(bool, DieOnSafepointTimeout, false, \
696 "Die upon failure to reach safepoint (see SafepointTimeout)") \
697 \
698 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
699 /* typically, at most a few retries are needed */ \
700 product(intx, SuspendRetryCount, 50, \
701 "Maximum retry count for an external suspend request") \
702 \
703 product(intx, SuspendRetryDelay, 5, \
704 "Milliseconds to delay per retry (* current_retry_count)") \
705 \
706 product(bool, AssertOnSuspendWaitFailure, false, \
707 "Assert/Guarantee on external suspend wait failure") \
708 \
709 product(bool, TraceSuspendWaitFailures, false, \
710 "Trace external suspend wait failures") \
711 \
712 product(bool, MaxFDLimit, true, \
713 "Bump the number of file descriptors to max in solaris.") \
714 \
715 notproduct(bool, LogEvents, trueInDebug, \
716 "Enable Event log") \
717 \
718 product(bool, BytecodeVerificationRemote, true, \
719 "Enables the Java bytecode verifier for remote classes") \
720 \
721 product(bool, BytecodeVerificationLocal, false, \
722 "Enables the Java bytecode verifier for local classes") \
723 \
724 develop(bool, ForceFloatExceptions, trueInDebug, \
725 "Force exceptions on FP stack under/overflow") \
726 \
727 develop(bool, SoftMatchFailure, trueInProduct, \
728 "If the DFA fails to match a node, print a message and bail out") \
729 \
730 develop(bool, VerifyStackAtCalls, false, \
731 "Verify that the stack pointer is unchanged after calls") \
732 \
733 develop(bool, TraceJavaAssertions, false, \
734 "Trace java language assertions") \
735 \
736 notproduct(bool, CheckAssertionStatusDirectives, false, \
737 "temporary - see javaClasses.cpp") \
738 \
739 notproduct(bool, PrintMallocFree, false, \
740 "Trace calls to C heap malloc/free allocation") \
741 \
742 product(bool, PrintOopAddress, false, \
743 "Always print the location of the oop") \
744 \
745 notproduct(bool, VerifyCodeCacheOften, false, \
746 "Verify compiled-code cache often") \
747 \
748 develop(bool, ZapDeadCompiledLocals, false, \
749 "Zap dead locals in compiler frames") \
750 \
751 notproduct(bool, ZapDeadLocalsOld, false, \
752 "Zap dead locals (old version, zaps all frames when " \
753 "entering the VM") \
754 \
755 notproduct(bool, CheckOopishValues, false, \
756 "Warn if value contains oop ( requires ZapDeadLocals)") \
757 \
758 develop(bool, UseMallocOnly, false, \
759 "use only malloc/free for allocation (no resource area/arena)") \
760 \
761 develop(bool, PrintMalloc, false, \
762 "print all malloc/free calls") \
763 \
764 develop(bool, PrintMallocStatistics, false, \
765 "print malloc/free statistics") \
766 \
767 develop(bool, ZapResourceArea, trueInDebug, \
768 "Zap freed resource/arena space with 0xABABABAB") \
769 \
770 notproduct(bool, ZapVMHandleArea, trueInDebug, \
771 "Zap freed VM handle space with 0xBCBCBCBC") \
772 \
773 develop(bool, ZapJNIHandleArea, trueInDebug, \
774 "Zap freed JNI handle space with 0xFEFEFEFE") \
775 \
776 notproduct(bool, ZapStackSegments, trueInDebug, \
777 "Zap allocated/freed Stack segments with 0xFADFADED") \
778 \
779 develop(bool, ZapUnusedHeapArea, trueInDebug, \
780 "Zap unused heap space with 0xBAADBABE") \
781 \
782 develop(bool, TraceZapUnusedHeapArea, false, \
783 "Trace zapping of unused heap space") \
784 \
785 develop(bool, CheckZapUnusedHeapArea, false, \
786 "Check zapping of unused heap space") \
787 \
788 develop(bool, ZapFillerObjects, trueInDebug, \
789 "Zap filler objects with 0xDEAFBABE") \
790 \
791 develop(bool, PrintVMMessages, true, \
792 "Print vm messages on console") \
793 \
794 product(bool, PrintGCApplicationConcurrentTime, false, \
795 "Print the time the application has been running") \
796 \
797 product(bool, PrintGCApplicationStoppedTime, false, \
798 "Print the time the application has been stopped") \
799 \
800 notproduct(uintx, ErrorHandlerTest, 0, \
801 "If > 0, provokes an error after VM initialization; the value" \
802 "determines which error to provoke. See test_error_handler()" \
803 "in debug.cpp.") \
804 \
805 develop(bool, Verbose, false, \
806 "Prints additional debugging information from other modes") \
807 \
808 develop(bool, PrintMiscellaneous, false, \
809 "Prints uncategorized debugging information (requires +Verbose)") \
810 \
811 develop(bool, WizardMode, false, \
812 "Prints much more debugging information") \
813 \
814 product(bool, ShowMessageBoxOnError, false, \
815 "Keep process alive on VM fatal error") \
816 \
817 product(bool, CreateMinidumpOnCrash, false, \
818 "Create minidump on VM fatal error") \
819 \
820 product_pd(bool, UseOSErrorReporting, \
821 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
822 \
823 product(bool, SuppressFatalErrorMessage, false, \
824 "Do NO Fatal Error report [Avoid deadlock]") \
825 \
826 product(ccstrlist, OnError, "", \
827 "Run user-defined commands on fatal error; see VMError.cpp " \
828 "for examples") \
829 \
830 product(ccstrlist, OnOutOfMemoryError, "", \
831 "Run user-defined commands on first java.lang.OutOfMemoryError") \
832 \
833 manageable(bool, HeapDumpBeforeFullGC, false, \
834 "Dump heap to file before any major stop-world GC") \
835 \
836 manageable(bool, HeapDumpAfterFullGC, false, \
837 "Dump heap to file after any major stop-world GC") \
838 \
839 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
840 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
841 \
842 manageable(ccstr, HeapDumpPath, NULL, \
843 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
844 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
845 "in the working directory)") \
846 \
847 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
848 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
849 "when the heap usage is larger than this") \
850 \
851 develop(uintx, HeapDumpSegmentSize, 1*G, \
852 "Approximate segment size when generating a segmented heap dump") \
853 \
854 develop(bool, BreakAtWarning, false, \
855 "Execute breakpoint upon encountering VM warning") \
856 \
857 product_pd(bool, UseVectoredExceptions, \
858 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
859 \
860 develop(bool, TraceVMOperation, false, \
861 "Trace vm operations") \
862 \
863 develop(bool, UseFakeTimers, false, \
864 "Tells whether the VM should use system time or a fake timer") \
865 \
866 diagnostic(bool, LogCompilation, false, \
867 "Log compilation activity in detail to hotspot.log or LogFile") \
868 \
869 product(bool, PrintCompilation, false, \
870 "Print compilations") \
871 \
872 diagnostic(bool, TraceNMethodInstalls, false, \
873 "Trace nmethod intallation") \
874 \
875 diagnostic(intx, ScavengeRootsInCode, 1, \
876 "0: do not allow scavengable oops in the code cache; " \
877 "1: allow scavenging from the code cache; " \
878 "2: emit as many constants as the compiler can see") \
879 \
880 diagnostic(bool, TraceOSRBreakpoint, false, \
881 "Trace OSR Breakpoint ") \
882 \
883 diagnostic(bool, TraceCompileTriggered, false, \
884 "Trace compile triggered") \
885 \
886 diagnostic(bool, TraceTriggers, false, \
887 "Trace triggers") \
888 \
889 product(bool, AlwaysRestoreFPU, false, \
890 "Restore the FPU control word after every JNI call (expensive)") \
891 \
892 notproduct(bool, PrintCompilation2, false, \
893 "Print additional statistics per compilation") \
894 \
895 diagnostic(bool, PrintAdapterHandlers, false, \
896 "Print code generated for i2c/c2i adapters") \
897 \
898 develop(bool, VerifyAdapterSharing, false, \
899 "Verify that the code for shared adapters is the equivalent") \
900 \
901 diagnostic(bool, PrintAssembly, false, \
902 "Print assembly code (using external disassembler.so)") \
903 \
904 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
905 "Options string passed to disassembler.so") \
906 \
907 diagnostic(bool, PrintNMethods, false, \
908 "Print assembly code for nmethods when generated") \
909 \
910 diagnostic(bool, PrintNativeNMethods, false, \
911 "Print assembly code for native nmethods when generated") \
912 \
913 develop(bool, PrintDebugInfo, false, \
914 "Print debug information for all nmethods when generated") \
915 \
916 develop(bool, PrintRelocations, false, \
917 "Print relocation information for all nmethods when generated") \
918 \
919 develop(bool, PrintDependencies, false, \
920 "Print dependency information for all nmethods when generated") \
921 \
922 develop(bool, PrintExceptionHandlers, false, \
923 "Print exception handler tables for all nmethods when generated") \
924 \
925 develop(bool, InterceptOSException, false, \
926 "Starts debugger when an implicit OS (e.g., NULL) " \
927 "exception happens") \
928 \
929 notproduct(bool, PrintCodeCache, false, \
930 "Print the compiled_code cache when exiting") \
931 \
932 develop(bool, PrintCodeCache2, false, \
933 "Print detailed info on the compiled_code cache when exiting") \
934 \
935 diagnostic(bool, PrintStubCode, false, \
936 "Print generated stub code") \
937 \
938 product(bool, StackTraceInThrowable, true, \
939 "Collect backtrace in throwable when exception happens") \
940 \
941 product(bool, OmitStackTraceInFastThrow, true, \
942 "Omit backtraces for some 'hot' exceptions in optimized code") \
943 \
944 product(bool, ProfilerPrintByteCodeStatistics, false, \
945 "Prints byte code statictics when dumping profiler output") \
946 \
947 product(bool, ProfilerRecordPC, false, \
948 "Collects tick for each 16 byte interval of compiled code") \
949 \
950 product(bool, ProfileVM, false, \
951 "Profiles ticks that fall within VM (either in the VM Thread " \
952 "or VM code called through stubs)") \
953 \
954 product(bool, ProfileIntervals, false, \
955 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
956 \
957 notproduct(bool, ProfilerCheckIntervals, false, \
958 "Collect and print info on spacing of profiler ticks") \
959 \
960 develop(bool, PrintJVMWarnings, false, \
961 "Prints warnings for unimplemented JVM functions") \
962 \
963 product(bool, PrintWarnings, true, \
964 "Prints JVM warnings to output stream") \
965 \
966 notproduct(uintx, WarnOnStalledSpinLock, 0, \
967 "Prints warnings for stalled SpinLocks") \
968 \
969 develop(bool, InitializeJavaLangSystem, true, \
970 "Initialize java.lang.System - turn off for individual " \
971 "method debugging") \
972 \
973 develop(bool, InitializeJavaLangString, true, \
974 "Initialize java.lang.String - turn off for individual " \
975 "method debugging") \
976 \
977 develop(bool, InitializeJavaLangExceptionsErrors, true, \
978 "Initialize various error and exception classes - turn off for " \
979 "individual method debugging") \
980 \
981 product(bool, RegisterFinalizersAtInit, true, \
982 "Register finalizable objects at end of Object.<init> or " \
983 "after allocation") \
984 \
985 develop(bool, RegisterReferences, true, \
986 "Tells whether the VM should register soft/weak/final/phantom " \
987 "references") \
988 \
989 develop(bool, IgnoreRewrites, false, \
990 "Supress rewrites of bytecodes in the oopmap generator. " \
991 "This is unsafe!") \
992 \
993 develop(bool, PrintCodeCacheExtension, false, \
994 "Print extension of code cache") \
995 \
996 develop(bool, UsePrivilegedStack, true, \
997 "Enable the security JVM functions") \
998 \
999 develop(bool, IEEEPrecision, true, \
1000 "Enables IEEE precision (for INTEL only)") \
1001 \
1002 develop(bool, ProtectionDomainVerification, true, \
1003 "Verifies protection domain before resolution in system " \
1004 "dictionary") \
1005 \
1006 product(bool, ClassUnloading, true, \
1007 "Do unloading of classes") \
1008 \
1009 diagnostic(bool, LinkWellKnownClasses, false, \
1010 "Resolve a well known class as soon as its name is seen") \
1011 \
1012 develop(bool, DisableStartThread, false, \
1013 "Disable starting of additional Java threads " \
1014 "(for debugging only)") \
1015 \
1016 develop(bool, MemProfiling, false, \
1017 "Write memory usage profiling to log file") \
1018 \
1019 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1020 "Prints the system dictionary at exit") \
1021 \
1022 diagnostic(bool, UnsyncloadClass, false, \
1023 "Unstable: VM calls loadClass unsynchronized. Custom " \
1024 "class loader must call VM synchronized for findClass " \
1025 "and defineClass.") \
1026 \
1027 product(bool, AlwaysLockClassLoader, false, \
1028 "Require the VM to acquire the class loader lock before calling " \
1029 "loadClass() even for class loaders registering " \
1030 "as parallel capable") \
1031 \
1032 product(bool, AllowParallelDefineClass, false, \
1033 "Allow parallel defineClass requests for class loaders " \
1034 "registering as parallel capable") \
1035 \
1036 product(bool, MustCallLoadClassInternal, false, \
1037 "Call loadClassInternal() rather than loadClass()") \
1038 \
1039 product_pd(bool, DontYieldALot, \
1040 "Throw away obvious excess yield calls (for SOLARIS only)") \
1041 \
1042 product_pd(bool, ConvertSleepToYield, \
1043 "Converts sleep(0) to thread yield " \
1044 "(may be off for SOLARIS to improve GUI)") \
1045 \
1046 product(bool, ConvertYieldToSleep, false, \
1047 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1048 "behavior (SOLARIS only)") \
1049 \
1050 product(bool, UseBoundThreads, true, \
1051 "Bind user level threads to kernel threads (for SOLARIS only)") \
1052 \
1053 develop(bool, UseDetachedThreads, true, \
1054 "Use detached threads that are recycled upon termination " \
1055 "(for SOLARIS only)") \
1056 \
1057 product(bool, UseLWPSynchronization, true, \
1058 "Use LWP-based instead of libthread-based synchronization " \
1059 "(SPARC only)") \
1060 \
1061 product(ccstr, SyncKnobs, NULL, \
1062 "(Unstable) Various monitor synchronization tunables") \
1063 \
1064 product(intx, EmitSync, 0, \
1065 "(Unsafe,Unstable) " \
1066 " Controls emission of inline sync fast-path code") \
1067 \
1068 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
1069 \
1070 product(intx, MonitorBound, 0, "Bound Monitor population") \
1071 \
1072 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1073 \
1074 product(intx, Atomics, 0, \
1075 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
1076 \
1077 product(intx, FenceInstruction, 0, \
1078 "(Unsafe,Unstable) Experimental") \
1079 \
1080 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1081 \
1082 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1083 \
1084 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1085 \
1086 product(intx, hashCode, 0, \
1087 "(Unstable) select hashCode generation algorithm" ) \
1088 \
1089 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1090 "(Unstable, Linux-specific)" \
1091 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1092 \
1093 product(bool, FilterSpuriousWakeups, true, \
1094 "Prevent spurious or premature wakeups from object.wait " \
1095 "(Solaris only)") \
1096 \
1097 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1098 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1099 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1100 \
1101 develop(bool, UsePthreads, false, \
1102 "Use pthread-based instead of libthread-based synchronization " \
1103 "(SPARC only)") \
1104 \
1105 product(bool, AdjustConcurrency, false, \
1106 "call thr_setconcurrency at thread create time to avoid " \
1107 "LWP starvation on MP systems (For Solaris Only)") \
1108 \
1109 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
1110 "Should the system attempt to update the compiler file when " \
1111 "an error occurs?") \
1112 \
1113 product(bool, ReduceSignalUsage, false, \
1114 "Reduce the use of OS signals in Java and/or the VM") \
1115 \
1116 notproduct(bool, ValidateMarkSweep, false, \
1117 "Do extra validation during MarkSweep collection") \
1118 \
1119 notproduct(bool, RecordMarkSweepCompaction, false, \
1120 "Enable GC-to-GC recording and querying of compaction during " \
1121 "MarkSweep") \
1122 \
1123 develop_pd(bool, ShareVtableStubs, \
1124 "Share vtable stubs (smaller code but worse branch prediction") \
1125 \
1126 develop(bool, LoadLineNumberTables, true, \
1127 "Tells whether the class file parser loads line number tables") \
1128 \
1129 develop(bool, LoadLocalVariableTables, true, \
1130 "Tells whether the class file parser loads local variable tables")\
1131 \
1132 develop(bool, LoadLocalVariableTypeTables, true, \
1133 "Tells whether the class file parser loads local variable type tables")\
1134 \
1135 product(bool, AllowUserSignalHandlers, false, \
1136 "Do not complain if the application installs signal handlers " \
1137 "(Solaris & Linux only)") \
1138 \
1139 product(bool, UseSignalChaining, true, \
1140 "Use signal-chaining to invoke signal handlers installed " \
1141 "by the application (Solaris & Linux only)") \
1142 \
1143 product(bool, UseAltSigs, false, \
1144 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1145 "internal signals (Solaris only)") \
1146 \
1147 product(bool, UseSpinning, false, \
1148 "Use spinning in monitor inflation and before entry") \
1149 \
1150 product(bool, PreSpinYield, false, \
1151 "Yield before inner spinning loop") \
1152 \
1153 product(bool, PostSpinYield, true, \
1154 "Yield after inner spinning loop") \
1155 \
1156 product(bool, AllowJNIEnvProxy, false, \
1157 "Allow JNIEnv proxies for jdbx") \
1158 \
1159 product(bool, JNIDetachReleasesMonitors, true, \
1160 "JNI DetachCurrentThread releases monitors owned by thread") \
1161 \
1162 product(bool, RestoreMXCSROnJNICalls, false, \
1163 "Restore MXCSR when returning from JNI calls") \
1164 \
1165 product(bool, CheckJNICalls, false, \
1166 "Verify all arguments to JNI calls") \
1167 \
1168 product(bool, UseFastJNIAccessors, true, \
1169 "Use optimized versions of Get<Primitive>Field") \
1170 \
1171 product(bool, EagerXrunInit, false, \
1172 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1173 " but not all -Xrun libraries may support the state of the VM at this time") \
1174 \
1175 product(bool, PreserveAllAnnotations, false, \
1176 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1177 \
1178 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1179 "Number of OutOfMemoryErrors preallocated with backtrace") \
1180 \
1181 product(bool, LazyBootClassLoader, true, \
1182 "Enable/disable lazy opening of boot class path entries") \
1183 \
1184 diagnostic(bool, UseIncDec, true, \
1185 "Use INC, DEC instructions on x86") \
1186 \
1187 product(bool, UseNewLongLShift, false, \
1188 "Use optimized bitwise shift left") \
1189 \
1190 product(bool, UseStoreImmI16, true, \
1191 "Use store immediate 16-bits value instruction on x86") \
1192 \
1193 product(bool, UseAddressNop, false, \
1194 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1195 \
1196 product(bool, UseXmmLoadAndClearUpper, true, \
1197 "Load low part of XMM register and clear upper part") \
1198 \
1199 product(bool, UseXmmRegToRegMoveAll, false, \
1200 "Copy all XMM register bits when moving value between registers") \
1201 \
1202 product(bool, UseXmmI2D, false, \
1203 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1204 \
1205 product(bool, UseXmmI2F, false, \
1206 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1207 \
1208 product(bool, UseXMMForArrayCopy, false, \
1209 "Use SSE2 MOVQ instruction for Arraycopy") \
1210 \
1211 product(bool, UseUnalignedLoadStores, false, \
1212 "Use SSE2 MOVDQU instruction for Arraycopy") \
1213 \
1214 product(bool, UseCBCond, false, \
1215 "Use compare and branch instruction on SPARC") \
1216 \
1217 product(intx, FieldsAllocationStyle, 1, \
1218 "0 - type based with oops first, 1 - with oops last, " \
1219 "2 - oops in super and sub classes are together") \
1220 \
1221 product(bool, CompactFields, true, \
1222 "Allocate nonstatic fields in gaps between previous fields") \
1223 \
1224 notproduct(bool, PrintCompactFieldsSavings, false, \
1225 "Print how many words were saved with CompactFields") \
1226 \
1227 product(bool, UseBiasedLocking, true, \
1228 "Enable biased locking in JVM") \
1229 \
1230 product(intx, BiasedLockingStartupDelay, 4000, \
1231 "Number of milliseconds to wait before enabling biased locking") \
1232 \
1233 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1234 "Print statistics of biased locking in JVM") \
1235 \
1236 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1237 "Threshold of number of revocations per type to try to " \
1238 "rebias all objects in the heap of that type") \
1239 \
1240 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1241 "Threshold of number of revocations per type to permanently " \
1242 "revoke biases of all objects in the heap of that type") \
1243 \
1244 product(intx, BiasedLockingDecayTime, 25000, \
1245 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1246 "type after previous bulk rebias") \
1247 \
1248 develop(bool, JavaObjectsInPerm, false, \
1249 "controls whether Classes and interned Strings are allocated" \
1250 "in perm. This purely intended to allow debugging issues" \
1251 "in production.") \
1252 \
1253 /* tracing */ \
1254 \
1255 notproduct(bool, TraceRuntimeCalls, false, \
1256 "Trace run-time calls") \
1257 \
1258 develop(bool, TraceJNICalls, false, \
1259 "Trace JNI calls") \
1260 \
1261 notproduct(bool, TraceJVMCalls, false, \
1262 "Trace JVM calls") \
1263 \
1264 product(ccstr, TraceJVMTI, NULL, \
1265 "Trace flags for JVMTI functions and events") \
1266 \
1267 /* This option can change an EMCP method into an obsolete method. */ \
1268 /* This can affect tests that except specific methods to be EMCP. */ \
1269 /* This option should be used with caution. */ \
1270 product(bool, StressLdcRewrite, false, \
1271 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1272 \
1273 product(intx, TraceRedefineClasses, 0, \
1274 "Trace level for JVMTI RedefineClasses") \
1275 \
1276 develop(bool, StressMethodComparator, false, \
1277 "run the MethodComparator on all loaded methods") \
1278 \
1279 /* change to false by default sometime after Mustang */ \
1280 product(bool, VerifyMergedCPBytecodes, true, \
1281 "Verify bytecodes after RedefineClasses constant pool merging") \
1282 \
1283 develop(bool, TraceJNIHandleAllocation, false, \
1284 "Trace allocation/deallocation of JNI handle blocks") \
1285 \
1286 develop(bool, TraceThreadEvents, false, \
1287 "Trace all thread events") \
1288 \
1289 develop(bool, TraceBytecodes, false, \
1290 "Trace bytecode execution") \
1291 \
1292 develop(bool, TraceClassInitialization, false, \
1293 "Trace class initialization") \
1294 \
1295 develop(bool, TraceExceptions, false, \
1296 "Trace exceptions") \
1297 \
1298 develop(bool, TraceICs, false, \
1299 "Trace inline cache changes") \
1300 \
1301 notproduct(bool, TraceInvocationCounterOverflow, false, \
1302 "Trace method invocation counter overflow") \
1303 \
1304 develop(bool, TraceInlineCacheClearing, false, \
1305 "Trace clearing of inline caches in nmethods") \
1306 \
1307 develop(bool, TraceDependencies, false, \
1308 "Trace dependencies") \
1309 \
1310 develop(bool, VerifyDependencies, trueInDebug, \
1311 "Exercise and verify the compilation dependency mechanism") \
1312 \
1313 develop(bool, TraceNewOopMapGeneration, false, \
1314 "Trace OopMapGeneration") \
1315 \
1316 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1317 "Trace OopMapGeneration: print detailed cell states") \
1318 \
1319 develop(bool, TimeOopMap, false, \
1320 "Time calls to GenerateOopMap::compute_map() in sum") \
1321 \
1322 develop(bool, TimeOopMap2, false, \
1323 "Time calls to GenerateOopMap::compute_map() individually") \
1324 \
1325 develop(bool, TraceMonitorMismatch, false, \
1326 "Trace monitor matching failures during OopMapGeneration") \
1327 \
1328 develop(bool, TraceOopMapRewrites, false, \
1329 "Trace rewritting of method oops during oop map generation") \
1330 \
1331 develop(bool, TraceSafepoint, false, \
1332 "Trace safepoint operations") \
1333 \
1334 develop(bool, TraceICBuffer, false, \
1335 "Trace usage of IC buffer") \
1336 \
1337 develop(bool, TraceCompiledIC, false, \
1338 "Trace changes of compiled IC") \
1339 \
1340 notproduct(bool, TraceZapDeadLocals, false, \
1341 "Trace zapping dead locals") \
1342 \
1343 develop(bool, TraceStartupTime, false, \
1344 "Trace setup time") \
1345 \
1346 product(ccstr, HPILibPath, NULL, \
1347 "Specify alternate path to HPI library") \
1348 \
1349 develop(bool, TraceProtectionDomainVerification, false, \
1350 "Trace protection domain verifcation") \
1351 \
1352 develop(bool, TraceClearedExceptions, false, \
1353 "Prints when an exception is forcibly cleared") \
1354 \
1355 product(bool, TraceClassResolution, false, \
1356 "Trace all constant pool resolutions (for debugging)") \
1357 \
1358 product(bool, TraceBiasedLocking, false, \
1359 "Trace biased locking in JVM") \
1360 \
1361 product(bool, TraceMonitorInflation, false, \
1362 "Trace monitor inflation in JVM") \
1363 \
1364 /* assembler */ \
1365 product(bool, Use486InstrsOnly, false, \
1366 "Use 80486 Compliant instruction subset") \
1367 \
1368 /* gc */ \
1369 \
1370 product(bool, UseSerialGC, false, \
1371 "Use the serial garbage collector") \
1372 \
1373 product(bool, UseG1GC, false, \
1374 "Use the Garbage-First garbage collector") \
1375 \
1376 product(bool, UseParallelGC, false, \
1377 "Use the Parallel Scavenge garbage collector") \
1378 \
1379 product(bool, UseParallelOldGC, false, \
1380 "Use the Parallel Old garbage collector") \
1381 \
1382 product(uintx, HeapMaximumCompactionInterval, 20, \
1383 "How often should we maximally compact the heap (not allowing " \
1384 "any dead space)") \
1385 \
1386 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1387 "The collection count for the first maximum compaction") \
1388 \
1389 product(bool, UseMaximumCompactionOnSystemGC, true, \
1390 "In the Parallel Old garbage collector maximum compaction for " \
1391 "a system GC") \
1392 \
1393 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1394 "The mean used by the par compact dead wood" \
1395 "limiter (a number between 0-100).") \
1396 \
1397 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1398 "The standard deviation used by the par compact dead wood" \
1399 "limiter (a number between 0-100).") \
1400 \
1401 product(uintx, ParallelGCThreads, 0, \
1402 "Number of parallel threads parallel gc will use") \
1403 \
1404 develop(bool, ParallelOldGCSplitALot, false, \
1405 "Provoke splitting (copying data from a young gen space to" \
1406 "multiple destination spaces)") \
1407 \
1408 develop(uintx, ParallelOldGCSplitInterval, 3, \
1409 "How often to provoke splitting a young gen space") \
1410 \
1411 develop(bool, TraceRegionTasksQueuing, false, \
1412 "Trace the queuing of the region tasks") \
1413 \
1414 product(uintx, ConcGCThreads, 0, \
1415 "Number of threads concurrent gc will use") \
1416 \
1417 product(uintx, YoungPLABSize, 4096, \
1418 "Size of young gen promotion labs (in HeapWords)") \
1419 \
1420 product(uintx, OldPLABSize, 1024, \
1421 "Size of old gen promotion labs (in HeapWords)") \
1422 \
1423 product(uintx, GCTaskTimeStampEntries, 200, \
1424 "Number of time stamp entries per gc worker thread") \
1425 \
1426 product(bool, AlwaysTenure, false, \
1427 "Always tenure objects in eden. (ParallelGC only)") \
1428 \
1429 product(bool, NeverTenure, false, \
1430 "Never tenure objects in eden, May tenure on overflow " \
1431 "(ParallelGC only)") \
1432 \
1433 product(bool, ScavengeBeforeFullGC, true, \
1434 "Scavenge youngest generation before each full GC, " \
1435 "used with UseParallelGC") \
1436 \
1437 develop(bool, ScavengeWithObjectsInToSpace, false, \
1438 "Allow scavenges to occur when to_space contains objects.") \
1439 \
1440 product(bool, UseConcMarkSweepGC, false, \
1441 "Use Concurrent Mark-Sweep GC in the old generation") \
1442 \
1443 product(bool, ExplicitGCInvokesConcurrent, false, \
1444 "A System.gc() request invokes a concurrent collection;" \
1445 " (effective only when UseConcMarkSweepGC)") \
1446 \
1447 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1448 "A System.gc() request invokes a concurrent collection and " \
1449 "also unloads classes during such a concurrent gc cycle " \
1450 "(effective only when UseConcMarkSweepGC)") \
1451 \
1452 product(bool, GCLockerInvokesConcurrent, false, \
1453 "The exit of a JNI CS necessitating a scavenge also" \
1454 " kicks off a bkgrd concurrent collection") \
1455 \
1456 product(uintx, GCLockerEdenExpansionPercent, 5, \
1457 "How much the GC can expand the eden by while the GC locker " \
1458 "is active (as a percentage)") \
1459 \
1460 develop(bool, UseCMSAdaptiveFreeLists, true, \
1461 "Use Adaptive Free Lists in the CMS generation") \
1462 \
1463 develop(bool, UseAsyncConcMarkSweepGC, true, \
1464 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1465 \
1466 develop(bool, RotateCMSCollectionTypes, false, \
1467 "Rotate the CMS collections among concurrent and STW") \
1468 \
1469 product(bool, UseCMSBestFit, true, \
1470 "Use CMS best fit allocation strategy") \
1471 \
1472 product(bool, UseCMSCollectionPassing, true, \
1473 "Use passing of collection from background to foreground") \
1474 \
1475 product(bool, UseParNewGC, false, \
1476 "Use parallel threads in the new generation.") \
1477 \
1478 product(bool, ParallelGCVerbose, false, \
1479 "Verbose output for parallel GC.") \
1480 \
1481 product(intx, ParallelGCBufferWastePct, 10, \
1482 "wasted fraction of parallel allocation buffer.") \
1483 \
1484 diagnostic(bool, ParallelGCRetainPLAB, false, \
1485 "Retain parallel allocation buffers across scavenges; " \
1486 " -- disabled because this currently conflicts with " \
1487 " parallel card scanning under certain conditions ") \
1488 \
1489 product(intx, TargetPLABWastePct, 10, \
1490 "target wasted space in last buffer as pct of overall allocation")\
1491 \
1492 product(uintx, PLABWeight, 75, \
1493 "Percentage (0-100) used to weight the current sample when" \
1494 "computing exponentially decaying average for ResizePLAB.") \
1495 \
1496 product(bool, ResizePLAB, true, \
1497 "Dynamically resize (survivor space) promotion labs") \
1498 \
1499 product(bool, PrintPLAB, false, \
1500 "Print (survivor space) promotion labs sizing decisions") \
1501 \
1502 product(intx, ParGCArrayScanChunk, 50, \
1503 "Scan a subset and push remainder, if array is bigger than this") \
1504 \
1505 product(bool, ParGCUseLocalOverflow, false, \
1506 "Instead of a global overflow list, use local overflow stacks") \
1507 \
1508 product(bool, ParGCTrimOverflow, true, \
1509 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1510 \
1511 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1512 "Whether we should simulate work queue overflow in ParNew") \
1513 \
1514 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1515 "An `interval' counter that determines how frequently " \
1516 "we simulate overflow; a smaller number increases frequency") \
1517 \
1518 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1519 "The desired number of objects to claim from the overflow list") \
1520 \
1521 diagnostic(intx, ParGCStridesPerThread, 2, \
1522 "The number of strides per worker thread that we divide up the " \
1523 "card table scanning work into") \
1524 \
1525 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1526 "The number of cards in each chunk of the parallel chunks used " \
1527 "during card table scanning") \
1528 \
1529 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1530 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1531 "parallel GC.") \
1532 \
1533 product(uintx, OldPLABWeight, 50, \
1534 "Percentage (0-100) used to weight the current sample when" \
1535 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1536 \
1537 product(bool, ResizeOldPLAB, true, \
1538 "Dynamically resize (old gen) promotion labs") \
1539 \
1540 product(bool, PrintOldPLAB, false, \
1541 "Print (old gen) promotion labs sizing decisions") \
1542 \
1543 product(uintx, CMSOldPLABMin, 16, \
1544 "Min size of CMS gen promotion lab caches per worker per blksize")\
1545 \
1546 product(uintx, CMSOldPLABMax, 1024, \
1547 "Max size of CMS gen promotion lab caches per worker per blksize")\
1548 \
1549 product(uintx, CMSOldPLABNumRefills, 4, \
1550 "Nominal number of refills of CMS gen promotion lab cache" \
1551 " per worker per block size") \
1552 \
1553 product(bool, CMSOldPLABResizeQuicker, false, \
1554 "Whether to react on-the-fly during a scavenge to a sudden" \
1555 " change in block demand rate") \
1556 \
1557 product(uintx, CMSOldPLABToleranceFactor, 4, \
1558 "The tolerance of the phase-change detector for on-the-fly" \
1559 " PLAB resizing during a scavenge") \
1560 \
1561 product(uintx, CMSOldPLABReactivityFactor, 2, \
1562 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1563 " during a scavenge") \
1564 \
1565 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1566 "The clamping of the gain in the feedback loop for on-the-fly" \
1567 " PLAB resizing during a scavenge") \
1568 \
1569 product(bool, AlwaysPreTouch, false, \
1570 "It forces all freshly committed pages to be pre-touched.") \
1571 \
1572 product_pd(intx, CMSYoungGenPerWorker, \
1573 "The maximum size of young gen chosen by default per GC worker " \
1574 "thread available") \
1575 \
1576 product(bool, GCOverheadReporting, false, \
1577 "Enables the GC overhead reporting facility") \
1578 \
1579 product(intx, GCOverheadReportingPeriodMS, 100, \
1580 "Reporting period for conc GC overhead reporting, in ms ") \
1581 \
1582 product(bool, CMSIncrementalMode, false, \
1583 "Whether CMS GC should operate in \"incremental\" mode") \
1584 \
1585 product(uintx, CMSIncrementalDutyCycle, 10, \
1586 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1587 "CMSIncrementalPacing is enabled, then this is just the initial" \
1588 "value") \
1589 \
1590 product(bool, CMSIncrementalPacing, true, \
1591 "Whether the CMS incremental mode duty cycle should be " \
1592 "automatically adjusted") \
1593 \
1594 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1595 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1596 "enabled (a percentage, 0-100)") \
1597 \
1598 product(uintx, CMSIncrementalSafetyFactor, 10, \
1599 "Percentage (0-100) used to add conservatism when computing the " \
1600 "duty cycle") \
1601 \
1602 product(uintx, CMSIncrementalOffset, 0, \
1603 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1604 " is shifted to the right within the period between young GCs") \
1605 \
1606 product(uintx, CMSExpAvgFactor, 50, \
1607 "Percentage (0-100) used to weight the current sample when" \
1608 "computing exponential averages for CMS statistics.") \
1609 \
1610 product(uintx, CMS_FLSWeight, 75, \
1611 "Percentage (0-100) used to weight the current sample when" \
1612 "computing exponentially decating averages for CMS FLS statistics.") \
1613 \
1614 product(uintx, CMS_FLSPadding, 1, \
1615 "The multiple of deviation from mean to use for buffering" \
1616 "against volatility in free list demand.") \
1617 \
1618 product(uintx, FLSCoalescePolicy, 2, \
1619 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1620 \
1621 product(bool, FLSAlwaysCoalesceLarge, false, \
1622 "CMS: Larger free blocks are always available for coalescing") \
1623 \
1624 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1625 "CMS: the smaller the percentage the greater the coalition force")\
1626 \
1627 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1628 "CMS: the factor by which to inflate estimated demand of small" \
1629 " block sizes to prevent coalescing with an adjoining block") \
1630 \
1631 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1632 "CMS: the factor by which to inflate estimated demand of large" \
1633 " block sizes to prevent coalescing with an adjoining block") \
1634 \
1635 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1636 "CMS: the factor by which to inflate estimated demand of small" \
1637 " block sizes to prevent splitting to supply demand for smaller" \
1638 " blocks") \
1639 \
1640 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1641 "CMS: the factor by which to inflate estimated demand of large" \
1642 " block sizes to prevent splitting to supply demand for smaller" \
1643 " blocks") \
1644 \
1645 product(bool, CMSExtrapolateSweep, false, \
1646 "CMS: cushion for block demand during sweep") \
1647 \
1648 product(uintx, CMS_SweepWeight, 75, \
1649 "Percentage (0-100) used to weight the current sample when " \
1650 "computing exponentially decaying average for inter-sweep " \
1651 "duration") \
1652 \
1653 product(uintx, CMS_SweepPadding, 1, \
1654 "The multiple of deviation from mean to use for buffering " \
1655 "against volatility in inter-sweep duration.") \
1656 \
1657 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1658 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1659 "duration exceeds this threhold in milliseconds") \
1660 \
1661 develop(bool, CMSTraceIncrementalMode, false, \
1662 "Trace CMS incremental mode") \
1663 \
1664 develop(bool, CMSTraceIncrementalPacing, false, \
1665 "Trace CMS incremental mode pacing computation") \
1666 \
1667 develop(bool, CMSTraceThreadState, false, \
1668 "Trace the CMS thread state (enable the trace_state() method)") \
1669 \
1670 product(bool, CMSClassUnloadingEnabled, false, \
1671 "Whether class unloading enabled when using CMS GC") \
1672 \
1673 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1674 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1675 " for which classes may not be unloaded") \
1676 \
1677 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1678 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1679 \
1680 product(bool, UseCMSCompactAtFullCollection, true, \
1681 "Use mark sweep compact at full collections") \
1682 \
1683 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1684 "Number of CMS full collection done before compaction if > 0") \
1685 \
1686 develop(intx, CMSDictionaryChoice, 0, \
1687 "Use BinaryTreeDictionary as default in the CMS generation") \
1688 \
1689 product(uintx, CMSIndexedFreeListReplenish, 4, \
1690 "Replenish an indexed free list with this number of chunks") \
1691 \
1692 product(bool, CMSReplenishIntermediate, true, \
1693 "Replenish all intermediate free-list caches") \
1694 \
1695 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1696 "When satisfying batched demand, split blocks from the " \
1697 "IndexedFreeList whose size is a multiple of requested size") \
1698 \
1699 product(bool, CMSLoopWarn, false, \
1700 "Warn in case of excessive CMS looping") \
1701 \
1702 develop(bool, CMSOverflowEarlyRestoration, false, \
1703 "Whether preserved marks should be restored early") \
1704 \
1705 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1706 "Size of marking stack") \
1707 \
1708 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1709 "Max size of marking stack") \
1710 \
1711 notproduct(bool, CMSMarkStackOverflowALot, false, \
1712 "Whether we should simulate frequent marking stack / work queue" \
1713 " overflow") \
1714 \
1715 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1716 "An `interval' counter that determines how frequently" \
1717 " we simulate overflow; a smaller number increases frequency") \
1718 \
1719 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1720 "(Temporary, subject to experimentation)" \
1721 "Maximum number of abortable preclean iterations, if > 0") \
1722 \
1723 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1724 "(Temporary, subject to experimentation)" \
1725 "Maximum time in abortable preclean in ms") \
1726 \
1727 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1728 "(Temporary, subject to experimentation)" \
1729 "Nominal minimum work per abortable preclean iteration") \
1730 \
1731 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1732 "(Temporary, subject to experimentation)" \
1733 " Time that we sleep between iterations when not given" \
1734 " enough work per iteration") \
1735 \
1736 product(uintx, CMSRescanMultiple, 32, \
1737 "Size (in cards) of CMS parallel rescan task") \
1738 \
1739 product(uintx, CMSConcMarkMultiple, 32, \
1740 "Size (in cards) of CMS concurrent MT marking task") \
1741 \
1742 product(uintx, CMSRevisitStackSize, 1*M, \
1743 "Size of CMS KlassKlass revisit stack") \
1744 \
1745 product(bool, CMSAbortSemantics, false, \
1746 "Whether abort-on-overflow semantics is implemented") \
1747 \
1748 product(bool, CMSParallelRemarkEnabled, true, \
1749 "Whether parallel remark enabled (only if ParNewGC)") \
1750 \
1751 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1752 "Whether parallel remark of survivor space" \
1753 " enabled (effective only if CMSParallelRemarkEnabled)") \
1754 \
1755 product(bool, CMSPLABRecordAlways, true, \
1756 "Whether to always record survivor space PLAB bdries" \
1757 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1758 \
1759 product(bool, CMSConcurrentMTEnabled, true, \
1760 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1761 \
1762 product(bool, CMSPermGenPrecleaningEnabled, true, \
1763 "Whether concurrent precleaning enabled in perm gen" \
1764 " (effective only when CMSPrecleaningEnabled is true)") \
1765 \
1766 product(bool, CMSPrecleaningEnabled, true, \
1767 "Whether concurrent precleaning enabled") \
1768 \
1769 product(uintx, CMSPrecleanIter, 3, \
1770 "Maximum number of precleaning iteration passes") \
1771 \
1772 product(uintx, CMSPrecleanNumerator, 2, \
1773 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1774 " ratio") \
1775 \
1776 product(uintx, CMSPrecleanDenominator, 3, \
1777 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1778 " ratio") \
1779 \
1780 product(bool, CMSPrecleanRefLists1, true, \
1781 "Preclean ref lists during (initial) preclean phase") \
1782 \
1783 product(bool, CMSPrecleanRefLists2, false, \
1784 "Preclean ref lists during abortable preclean phase") \
1785 \
1786 product(bool, CMSPrecleanSurvivors1, false, \
1787 "Preclean survivors during (initial) preclean phase") \
1788 \
1789 product(bool, CMSPrecleanSurvivors2, true, \
1790 "Preclean survivors during abortable preclean phase") \
1791 \
1792 product(uintx, CMSPrecleanThreshold, 1000, \
1793 "Don't re-iterate if #dirty cards less than this") \
1794 \
1795 product(bool, CMSCleanOnEnter, true, \
1796 "Clean-on-enter optimization for reducing number of dirty cards") \
1797 \
1798 product(uintx, CMSRemarkVerifyVariant, 1, \
1799 "Choose variant (1,2) of verification following remark") \
1800 \
1801 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1802 "If Eden used is below this value, don't try to schedule remark") \
1803 \
1804 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1805 "The Eden occupancy % at which to try and schedule remark pause") \
1806 \
1807 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1808 "Start sampling Eden top at least before yg occupancy reaches" \
1809 " 1/<ratio> of the size at which we plan to schedule remark") \
1810 \
1811 product(uintx, CMSSamplingGrain, 16*K, \
1812 "The minimum distance between eden samples for CMS (see above)") \
1813 \
1814 product(bool, CMSScavengeBeforeRemark, false, \
1815 "Attempt scavenge before the CMS remark step") \
1816 \
1817 develop(bool, CMSTraceSweeper, false, \
1818 "Trace some actions of the CMS sweeper") \
1819 \
1820 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1821 "Don't drain below this size per parallel worker/thief") \
1822 \
1823 manageable(intx, CMSWaitDuration, 2000, \
1824 "Time in milliseconds that CMS thread waits for young GC") \
1825 \
1826 product(bool, CMSYield, true, \
1827 "Yield between steps of concurrent mark & sweep") \
1828 \
1829 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1830 "Bitmap operations should process at most this many bits" \
1831 "between yields") \
1832 \
1833 product(bool, CMSDumpAtPromotionFailure, false, \
1834 "Dump useful information about the state of the CMS old " \
1835 " generation upon a promotion failure.") \
1836 \
1837 product(bool, CMSPrintChunksInDump, false, \
1838 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1839 " more detailed information about the free chunks.") \
1840 \
1841 product(bool, CMSPrintObjectsInDump, false, \
1842 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1843 " more detailed information about the allocated objects.") \
1844 \
1845 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1846 "Verify that all refs across the FLS boundary " \
1847 " are to valid objects") \
1848 \
1849 diagnostic(bool, FLSVerifyLists, false, \
1850 "Do lots of (expensive) FreeListSpace verification") \
1851 \
1852 diagnostic(bool, FLSVerifyIndexTable, false, \
1853 "Do lots of (expensive) FLS index table verification") \
1854 \
1855 develop(bool, FLSVerifyDictionary, false, \
1856 "Do lots of (expensive) FLS dictionary verification") \
1857 \
1858 develop(bool, VerifyBlockOffsetArray, false, \
1859 "Do (expensive!) block offset array verification") \
1860 \
1861 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1862 "Maintain _unallocated_block in BlockOffsetArray" \
1863 " (currently applicable only to CMS collector)") \
1864 \
1865 develop(bool, TraceCMSState, false, \
1866 "Trace the state of the CMS collection") \
1867 \
1868 product(intx, RefDiscoveryPolicy, 0, \
1869 "Whether reference-based(0) or referent-based(1)") \
1870 \
1871 product(bool, ParallelRefProcEnabled, false, \
1872 "Enable parallel reference processing whenever possible") \
1873 \
1874 product(bool, ParallelRefProcBalancingEnabled, true, \
1875 "Enable balancing of reference processing queues") \
1876 \
1877 product(intx, CMSTriggerRatio, 80, \
1878 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1879 "allocated before a CMS collection cycle commences") \
1880 \
1881 product(intx, CMSTriggerPermRatio, 80, \
1882 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1883 "is allocated before a CMS collection cycle commences, that " \
1884 "also collects the perm generation") \
1885 \
1886 product(uintx, CMSBootstrapOccupancy, 50, \
1887 "Percentage CMS generation occupancy at which to " \
1888 "initiate CMS collection for bootstrapping collection stats") \
1889 \
1890 product(intx, CMSInitiatingOccupancyFraction, -1, \
1891 "Percentage CMS generation occupancy to start a CMS collection " \
1892 "cycle. A negative value means that CMSTriggerRatio is used") \
1893 \
1894 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1895 "Percentage of the (entire) heap occupancy to start a " \
1896 "concurrent GC cycle. It us used by GCs that trigger a " \
1897 "concurrent GC cycle based on the occupancy of the entire heap, " \
1898 "not just one of the generations (e.g., G1). A value of 0 " \
1899 "denotes 'do constant GC cycles'.") \
1900 \
1901 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1902 "Percentage CMS perm generation occupancy to start a " \
1903 "CMScollection cycle. A negative value means that " \
1904 "CMSTriggerPermRatio is used") \
1905 \
1906 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1907 "Only use occupancy as a crierion for starting a CMS collection") \
1908 \
1909 product(intx, CMSIsTooFullPercentage, 98, \
1910 "An absolute ceiling above which CMS will always consider the " \
1911 "perm gen ripe for collection") \
1912 \
1913 develop(bool, CMSTestInFreeList, false, \
1914 "Check if the coalesced range is already in the " \
1915 "free lists as claimed") \
1916 \
1917 notproduct(bool, CMSVerifyReturnedBytes, false, \
1918 "Check that all the garbage collected was returned to the " \
1919 "free lists.") \
1920 \
1921 notproduct(bool, ScavengeALot, false, \
1922 "Force scavenge at every Nth exit from the runtime system " \
1923 "(N=ScavengeALotInterval)") \
1924 \
1925 develop(bool, FullGCALot, false, \
1926 "Force full gc at every Nth exit from the runtime system " \
1927 "(N=FullGCALotInterval)") \
1928 \
1929 notproduct(bool, GCALotAtAllSafepoints, false, \
1930 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1931 \
1932 product(bool, PrintPromotionFailure, false, \
1933 "Print additional diagnostic information following " \
1934 " promotion failure") \
1935 \
1936 notproduct(bool, PromotionFailureALot, false, \
1937 "Use promotion failure handling on every youngest generation " \
1938 "collection") \
1939 \
1940 develop(uintx, PromotionFailureALotCount, 1000, \
1941 "Number of promotion failures occurring at ParGCAllocBuffer" \
1942 "refill attempts (ParNew) or promotion attempts " \
1943 "(other young collectors) ") \
1944 \
1945 develop(uintx, PromotionFailureALotInterval, 5, \
1946 "Total collections between promotion failures alot") \
1947 \
1948 experimental(intx, WorkStealingSleepMillis, 1, \
1949 "Sleep time when sleep is used for yields") \
1950 \
1951 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1952 "Number of yields before a sleep is done during workstealing") \
1953 \
1954 experimental(uintx, WorkStealingHardSpins, 4096, \
1955 "Number of iterations in a spin loop between checks on " \
1956 "time out of hard spin") \
1957 \
1958 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1959 "Ratio of hard spins to calls to yield") \
1960 \
1961 product(uintx, PreserveMarkStackSize, 1024, \
1962 "Size for stack used in promotion failure handling") \
1963 \
1964 develop(uintx, ObjArrayMarkingStride, 512, \
1965 "Number of ObjArray elements to push onto the marking stack" \
1966 "before pushing a continuation entry") \
1967 \
1968 notproduct(bool, ExecuteInternalVMTests, false, \
1969 "Enable execution of internal VM tests.") \
1970 \
1971 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1972 \
1973 product_pd(bool, ResizeTLAB, \
1974 "Dynamically resize tlab size for threads") \
1975 \
1976 product(bool, ZeroTLAB, false, \
1977 "Zero out the newly created TLAB") \
1978 \
1979 product(bool, FastTLABRefill, true, \
1980 "Use fast TLAB refill code") \
1981 \
1982 product(bool, PrintTLAB, false, \
1983 "Print various TLAB related information") \
1984 \
1985 product(bool, TLABStats, true, \
1986 "Print various TLAB related information") \
1987 \
1988 product(bool, UseBlockZeroing, false, \
1989 "Use special cpu instructions for block zeroing") \
1990 \
1991 product(intx, BlockZeroingLowLimit, 2048, \
1992 "Minimum size in bytes when block zeroing will be used") \
1993 \
1994 product(bool, UseBlockCopy, false, \
1995 "Use special cpu instructions for block copy") \
1996 \
1997 product(intx, BlockCopyLowLimit, 2048, \
1998 "Minimum size in bytes when block copy will be used") \
1999 \
2000 product(bool, PrintRevisitStats, false, \
2001 "Print revisit (klass and MDO) stack related information") \
2002 \
2003 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
2004 "Enable LowMemoryProtection")) \
2005 \
2006 product_pd(bool, NeverActAsServerClassMachine, \
2007 "Never act like a server-class machine") \
2008 \
2009 product(bool, AlwaysActAsServerClassMachine, false, \
2010 "Always act like a server-class machine") \
2011 \
2012 product_pd(uint64_t, MaxRAM, \
2013 "Real memory size (in bytes) used to set maximum heap size") \
2014 \
2015 product(uintx, ErgoHeapSizeLimit, 0, \
2016 "Maximum ergonomically set heap size (in bytes); zero means use " \
2017 "MaxRAM / MaxRAMFraction") \
2018 \
2019 product(uintx, MaxRAMFraction, 4, \
2020 "Maximum fraction (1/n) of real memory used for maximum heap " \
2021 "size") \
2022 \
2023 product(uintx, DefaultMaxRAMFraction, 4, \
2024 "Maximum fraction (1/n) of real memory used for maximum heap " \
2025 "size; deprecated: to be renamed to MaxRAMFraction") \
2026 \
2027 product(uintx, MinRAMFraction, 2, \
2028 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
2029 "size on systems with small physical memory size") \
2030 \
2031 product(uintx, InitialRAMFraction, 64, \
2032 "Fraction (1/n) of real memory used for initial heap size") \
2033 \
2034 product(bool, UseAutoGCSelectPolicy, false, \
2035 "Use automatic collection selection policy") \
2036 \
2037 product(uintx, AutoGCSelectPauseMillis, 5000, \
2038 "Automatic GC selection pause threshhold in ms") \
2039 \
2040 product(bool, UseAdaptiveSizePolicy, true, \
2041 "Use adaptive generation sizing policies") \
2042 \
2043 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2044 "Use adaptive survivor sizing policies") \
2045 \
2046 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2047 "Use adaptive young-old sizing policies at minor collections") \
2048 \
2049 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2050 "Use adaptive young-old sizing policies at major collections") \
2051 \
2052 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2053 "Use statistics from System.GC for adaptive size policy") \
2054 \
2055 product(bool, UseAdaptiveGCBoundary, false, \
2056 "Allow young-old boundary to move") \
2057 \
2058 develop(bool, TraceAdaptiveGCBoundary, false, \
2059 "Trace young-old boundary moves") \
2060 \
2061 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2062 "Resize the virtual spaces of the young or old generations") \
2063 \
2064 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2065 "Policy for changeing generation size for throughput goals") \
2066 \
2067 product(uintx, AdaptiveSizePausePolicy, 0, \
2068 "Policy for changing generation size for pause goals") \
2069 \
2070 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2071 "Adjust tenured generation to achive a minor pause goal") \
2072 \
2073 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2074 "Adjust young generation to achive a major pause goal") \
2075 \
2076 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2077 "Number of steps where heuristics is used before data is used") \
2078 \
2079 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2080 "Number of collections before the adaptive sizing is started") \
2081 \
2082 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2083 "Collecton interval for printing information; zero => never") \
2084 \
2085 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2086 "Use adaptive minimum footprint as a goal") \
2087 \
2088 product(uintx, AdaptiveSizePolicyWeight, 10, \
2089 "Weight given to exponential resizing, between 0 and 100") \
2090 \
2091 product(uintx, AdaptiveTimeWeight, 25, \
2092 "Weight given to time in adaptive policy, between 0 and 100") \
2093 \
2094 product(uintx, PausePadding, 1, \
2095 "How much buffer to keep for pause time") \
2096 \
2097 product(uintx, PromotedPadding, 3, \
2098 "How much buffer to keep for promotion failure") \
2099 \
2100 product(uintx, SurvivorPadding, 3, \
2101 "How much buffer to keep for survivor overflow") \
2102 \
2103 product(uintx, AdaptivePermSizeWeight, 20, \
2104 "Weight for perm gen exponential resizing, between 0 and 100") \
2105 \
2106 product(uintx, PermGenPadding, 3, \
2107 "How much buffer to keep for perm gen sizing") \
2108 \
2109 product(uintx, ThresholdTolerance, 10, \
2110 "Allowed collection cost difference between generations") \
2111 \
2112 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2113 "If collection costs are within margin, reduce both by full " \
2114 "delta") \
2115 \
2116 product(uintx, YoungGenerationSizeIncrement, 20, \
2117 "Adaptive size percentage change in young generation") \
2118 \
2119 product(uintx, YoungGenerationSizeSupplement, 80, \
2120 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2121 \
2122 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2123 "Decay factor to YoungedGenerationSizeSupplement") \
2124 \
2125 product(uintx, TenuredGenerationSizeIncrement, 20, \
2126 "Adaptive size percentage change in tenured generation") \
2127 \
2128 product(uintx, TenuredGenerationSizeSupplement, 80, \
2129 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2130 \
2131 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2132 "Decay factor to TenuredGenerationSizeIncrement") \
2133 \
2134 product(uintx, MaxGCPauseMillis, max_uintx, \
2135 "Adaptive size policy maximum GC pause time goal in msec, " \
2136 "or (G1 Only) the max. GC time per MMU time slice") \
2137 \
2138 product(uintx, GCPauseIntervalMillis, 0, \
2139 "Time slice for MMU specification") \
2140 \
2141 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2142 "Adaptive size policy maximum GC minor pause time goal in msec") \
2143 \
2144 product(uintx, GCTimeRatio, 99, \
2145 "Adaptive size policy application time to GC time ratio") \
2146 \
2147 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2148 "Adaptive size scale down factor for shrinking") \
2149 \
2150 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2151 "Adaptive size decays the major cost for long major intervals") \
2152 \
2153 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2154 "Time scale over which major costs decay") \
2155 \
2156 product(uintx, MinSurvivorRatio, 3, \
2157 "Minimum ratio of young generation/survivor space size") \
2158 \
2159 product(uintx, InitialSurvivorRatio, 8, \
2160 "Initial ratio of eden/survivor space size") \
2161 \
2162 product(uintx, BaseFootPrintEstimate, 256*M, \
2163 "Estimate of footprint other than Java Heap") \
2164 \
2165 product(bool, UseGCOverheadLimit, true, \
2166 "Use policy to limit of proportion of time spent in GC " \
2167 "before an OutOfMemory error is thrown") \
2168 \
2169 product(uintx, GCTimeLimit, 98, \
2170 "Limit of proportion of time spent in GC before an OutOfMemory" \
2171 "error is thrown (used with GCHeapFreeLimit)") \
2172 \
2173 product(uintx, GCHeapFreeLimit, 2, \
2174 "Minimum percentage of free space after a full GC before an " \
2175 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2176 \
2177 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2178 "Number of consecutive collections before gc time limit fires") \
2179 \
2180 product(bool, PrintAdaptiveSizePolicy, false, \
2181 "Print information about AdaptiveSizePolicy") \
2182 \
2183 product(intx, PrefetchCopyIntervalInBytes, -1, \
2184 "How far ahead to prefetch destination area (<= 0 means off)") \
2185 \
2186 product(intx, PrefetchScanIntervalInBytes, -1, \
2187 "How far ahead to prefetch scan area (<= 0 means off)") \
2188 \
2189 product(intx, PrefetchFieldsAhead, -1, \
2190 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2191 \
2192 develop(bool, UsePrefetchQueue, true, \
2193 "Use the prefetch queue during PS promotion") \
2194 \
2195 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2196 "Verify system before exiting") \
2197 \
2198 diagnostic(bool, VerifyBeforeGC, false, \
2199 "Verify memory system before GC") \
2200 \
2201 diagnostic(bool, VerifyAfterGC, false, \
2202 "Verify memory system after GC") \
2203 \
2204 diagnostic(bool, VerifyDuringGC, false, \
2205 "Verify memory system during GC (between phases)") \
2206 \
2207 diagnostic(bool, GCParallelVerificationEnabled, true, \
2208 "Enable parallel memory system verification") \
2209 \
2210 diagnostic(bool, DeferInitialCardMark, false, \
2211 "When +ReduceInitialCardMarks, explicitly defer any that " \
2212 "may arise from new_pre_store_barrier") \
2213 \
2214 diagnostic(bool, VerifyRememberedSets, false, \
2215 "Verify GC remembered sets") \
2216 \
2217 diagnostic(bool, VerifyObjectStartArray, true, \
2218 "Verify GC object start array if verify before/after") \
2219 \
2220 product(bool, DisableExplicitGC, false, \
2221 "Tells whether calling System.gc() does a full GC") \
2222 \
2223 notproduct(bool, CheckMemoryInitialization, false, \
2224 "Checks memory initialization") \
2225 \
2226 product(bool, CollectGen0First, false, \
2227 "Collect youngest generation before each full GC") \
2228 \
2229 diagnostic(bool, BindCMSThreadToCPU, false, \
2230 "Bind CMS Thread to CPU if possible") \
2231 \
2232 diagnostic(uintx, CPUForCMSThread, 0, \
2233 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2234 \
2235 product(bool, BindGCTaskThreadsToCPUs, false, \
2236 "Bind GCTaskThreads to CPUs if possible") \
2237 \
2238 product(bool, UseGCTaskAffinity, false, \
2239 "Use worker affinity when asking for GCTasks") \
2240 \
2241 product(uintx, ProcessDistributionStride, 4, \
2242 "Stride through processors when distributing processes") \
2243 \
2244 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2245 "number of times the coordinator GC thread will sleep while " \
2246 "yielding before giving up and resuming GC") \
2247 \
2248 product(uintx, CMSYieldSleepCount, 0, \
2249 "number of times a GC thread (minus the coordinator) " \
2250 "will sleep while yielding before giving up and resuming GC") \
2251 \
2252 /* gc tracing */ \
2253 manageable(bool, PrintGC, false, \
2254 "Print message at garbage collect") \
2255 \
2256 manageable(bool, PrintGCDetails, false, \
2257 "Print more details at garbage collect") \
2258 \
2259 manageable(bool, PrintGCDateStamps, false, \
2260 "Print date stamps at garbage collect") \
2261 \
2262 manageable(bool, PrintGCTimeStamps, false, \
2263 "Print timestamps at garbage collect") \
2264 \
2265 product(bool, PrintGCTaskTimeStamps, false, \
2266 "Print timestamps for individual gc worker thread tasks") \
2267 \
2268 develop(intx, ConcGCYieldTimeout, 0, \
2269 "If non-zero, assert that GC threads yield within this # of ms.") \
2270 \
2271 notproduct(bool, TraceMarkSweep, false, \
2272 "Trace mark sweep") \
2273 \
2274 product(bool, PrintReferenceGC, false, \
2275 "Print times spent handling reference objects during GC " \
2276 " (enabled only when PrintGCDetails)") \
2277 \
2278 develop(bool, TraceReferenceGC, false, \
2279 "Trace handling of soft/weak/final/phantom references") \
2280 \
2281 develop(bool, TraceFinalizerRegistration, false, \
2282 "Trace registration of final references") \
2283 \
2284 notproduct(bool, TraceScavenge, false, \
2285 "Trace scavenge") \
2286 \
2287 product_rw(bool, TraceClassLoading, false, \
2288 "Trace all classes loaded") \
2289 \
2290 product(bool, TraceClassLoadingPreorder, false, \
2291 "Trace all classes loaded in order referenced (not loaded)") \
2292 \
2293 product_rw(bool, TraceClassUnloading, false, \
2294 "Trace unloading of classes") \
2295 \
2296 product_rw(bool, TraceLoaderConstraints, false, \
2297 "Trace loader constraints") \
2298 \
2299 product(bool, TraceGen0Time, false, \
2300 "Trace accumulated time for Gen 0 collection") \
2301 \
2302 product(bool, TraceGen1Time, false, \
2303 "Trace accumulated time for Gen 1 collection") \
2304 \
2305 product(bool, PrintTenuringDistribution, false, \
2306 "Print tenuring age information") \
2307 \
2308 product_rw(bool, PrintHeapAtGC, false, \
2309 "Print heap layout before and after each GC") \
2310 \
2311 product_rw(bool, PrintHeapAtGCExtended, false, \
2312 "Prints extended information about the layout of the heap " \
2313 "when -XX:+PrintHeapAtGC is set") \
2314 \
2315 product(bool, PrintHeapAtSIGBREAK, true, \
2316 "Print heap layout in response to SIGBREAK") \
2317 \
2318 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2319 "Print a class histogram before any major stop-world GC") \
2320 \
2321 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2322 "Print a class histogram after any major stop-world GC") \
2323 \
2324 manageable(bool, PrintClassHistogram, false, \
2325 "Print a histogram of class instances") \
2326 \
2327 develop(bool, TraceWorkGang, false, \
2328 "Trace activities of work gangs") \
2329 \
2330 product(bool, TraceParallelOldGCTasks, false, \
2331 "Trace multithreaded GC activity") \
2332 \
2333 develop(bool, TraceBlockOffsetTable, false, \
2334 "Print BlockOffsetTable maps") \
2335 \
2336 develop(bool, TraceCardTableModRefBS, false, \
2337 "Print CardTableModRefBS maps") \
2338 \
2339 develop(bool, TraceGCTaskManager, false, \
2340 "Trace actions of the GC task manager") \
2341 \
2342 develop(bool, TraceGCTaskQueue, false, \
2343 "Trace actions of the GC task queues") \
2344 \
2345 develop(bool, TraceGCTaskThread, false, \
2346 "Trace actions of the GC task threads") \
2347 \
2348 product(bool, PrintParallelOldGCPhaseTimes, false, \
2349 "Print the time taken by each parallel old gc phase." \
2350 "PrintGCDetails must also be enabled.") \
2351 \
2352 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2353 "Trace parallel old gc marking phase") \
2354 \
2355 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2356 "Trace parallel old gc summary phase") \
2357 \
2358 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2359 "Trace parallel old gc compaction phase") \
2360 \
2361 develop(bool, TraceParallelOldGCDensePrefix, false, \
2362 "Trace parallel old gc dense prefix computation") \
2363 \
2364 develop(bool, IgnoreLibthreadGPFault, false, \
2365 "Suppress workaround for libthread GP fault") \
2366 \
2367 product(bool, PrintJNIGCStalls, false, \
2368 "Print diagnostic message when GC is stalled" \
2369 "by JNI critical section") \
2370 \
2371 /* GC log rotation setting */ \
2372 \
2373 product(bool, UseGCLogFileRotation, false, \
2374 "Prevent large gclog file for long running app. " \
2375 "Requires -Xloggc:<filename>") \
2376 \
2377 product(uintx, NumberOfGCLogFiles, 0, \
2378 "Number of gclog files in rotation, " \
2379 "Default: 0, no rotation") \
2380 \
2381 product(uintx, GCLogFileSize, 0, \
2382 "GC log file size, Default: 0 bytes, no rotation " \
2383 "Only valid with UseGCLogFileRotation") \
2384 \
2385 /* JVMTI heap profiling */ \
2386 \
2387 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2388 "Trace JVMTI object tagging calls") \
2389 \
2390 diagnostic(bool, VerifyBeforeIteration, false, \
2391 "Verify memory system before JVMTI iteration") \
2392 \
2393 /* compiler interface */ \
2394 \
2395 develop(bool, CIPrintCompilerName, false, \
2396 "when CIPrint is active, print the name of the active compiler") \
2397 \
2398 develop(bool, CIPrintCompileQueue, false, \
2399 "display the contents of the compile queue whenever a " \
2400 "compilation is enqueued") \
2401 \
2402 develop(bool, CIPrintRequests, false, \
2403 "display every request for compilation") \
2404 \
2405 product(bool, CITime, false, \
2406 "collect timing information for compilation") \
2407 \
2408 develop(bool, CITimeEach, false, \
2409 "display timing information after each successful compilation") \
2410 \
2411 develop(bool, CICountOSR, true, \
2412 "use a separate counter when assigning ids to osr compilations") \
2413 \
2414 develop(bool, CICompileNatives, true, \
2415 "compile native methods if supported by the compiler") \
2416 \
2417 develop_pd(bool, CICompileOSR, \
2418 "compile on stack replacement methods if supported by the " \
2419 "compiler") \
2420 \
2421 develop(bool, CIPrintMethodCodes, false, \
2422 "print method bytecodes of the compiled code") \
2423 \
2424 develop(bool, CIPrintTypeFlow, false, \
2425 "print the results of ciTypeFlow analysis") \
2426 \
2427 develop(bool, CITraceTypeFlow, false, \
2428 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2429 \
2430 develop(intx, CICloneLoopTestLimit, 100, \
2431 "size limit for blocks heuristically cloned in ciTypeFlow") \
2432 \
2433 develop(intx, OSROnlyBCI, -1, \
2434 "OSR only at this bci. Negative values mean exclude that bci") \
2435 \
2436 /* temp diagnostics */ \
2437 \
2438 diagnostic(bool, TraceRedundantCompiles, false, \
2439 "Have compile broker print when a request already in the queue is"\
2440 " requested again") \
2441 \
2442 diagnostic(bool, InitialCompileFast, false, \
2443 "Initial compile at CompLevel_fast_compile") \
2444 \
2445 diagnostic(bool, InitialCompileReallyFast, false, \
2446 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2447 \
2448 diagnostic(bool, FullProfileOnReInterpret, true, \
2449 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2450 \
2451 /* compiler */ \
2452 \
2453 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2454 "Number of compiler threads to run") \
2455 \
2456 product(intx, CompilationPolicyChoice, 0, \
2457 "which compilation policy (0/1)") \
2458 \
2459 develop(bool, UseStackBanging, true, \
2460 "use stack banging for stack overflow checks (required for " \
2461 "proper StackOverflow handling; disable only to measure cost " \
2462 "of stackbanging)") \
2463 \
2464 develop(bool, Use24BitFPMode, true, \
2465 "Set 24-bit FPU mode on a per-compile basis ") \
2466 \
2467 develop(bool, Use24BitFP, true, \
2468 "use FP instructions that produce 24-bit precise results") \
2469 \
2470 develop(bool, UseStrictFP, true, \
2471 "use strict fp if modifier strictfp is set") \
2472 \
2473 develop(bool, GenerateSynchronizationCode, true, \
2474 "generate locking/unlocking code for synchronized methods and " \
2475 "monitors") \
2476 \
2477 develop(bool, GenerateCompilerNullChecks, true, \
2478 "Generate explicit null checks for loads/stores/calls") \
2479 \
2480 develop(bool, GenerateRangeChecks, true, \
2481 "Generate range checks for array accesses") \
2482 \
2483 develop_pd(bool, ImplicitNullChecks, \
2484 "generate code for implicit null checks") \
2485 \
2486 product(bool, PrintSafepointStatistics, false, \
2487 "print statistics about safepoint synchronization") \
2488 \
2489 product(intx, PrintSafepointStatisticsCount, 300, \
2490 "total number of safepoint statistics collected " \
2491 "before printing them out") \
2492 \
2493 product(intx, PrintSafepointStatisticsTimeout, -1, \
2494 "print safepoint statistics only when safepoint takes" \
2495 " more than PrintSafepointSatisticsTimeout in millis") \
2496 \
2497 product(bool, TraceSafepointCleanupTime, false, \
2498 "print the break down of clean up tasks performed during" \
2499 " safepoint") \
2500 \
2501 develop(bool, InlineAccessors, true, \
2502 "inline accessor methods (get/set)") \
2503 \
2504 product(bool, Inline, true, \
2505 "enable inlining") \
2506 \
2507 product(bool, ClipInlining, true, \
2508 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2509 \
2510 develop(bool, UseCHA, true, \
2511 "enable CHA") \
2512 \
2513 product(bool, UseTypeProfile, true, \
2514 "Check interpreter profile for historically monomorphic calls") \
2515 \
2516 product(intx, TypeProfileMajorReceiverPercent, 90, \
2517 "% of major receiver type to all profiled receivers") \
2518 \
2519 notproduct(bool, TimeCompiler, false, \
2520 "time the compiler") \
2521 \
2522 notproduct(bool, TimeCompiler2, false, \
2523 "detailed time the compiler (requires +TimeCompiler)") \
2524 \
2525 diagnostic(bool, PrintInlining, false, \
2526 "prints inlining optimizations") \
2527 \
2528 diagnostic(bool, PrintIntrinsics, false, \
2529 "prints attempted and successful inlining of intrinsics") \
2530 \
2531 product(bool, UseCountLeadingZerosInstruction, false, \
2532 "Use count leading zeros instruction") \
2533 \
2534 product(bool, UsePopCountInstruction, false, \
2535 "Use population count instruction") \
2536 \
2537 diagnostic(ccstrlist, DisableIntrinsic, "", \
2538 "do not expand intrinsics whose (internal) names appear here") \
2539 \
2540 develop(bool, StressReflectiveCode, false, \
2541 "Use inexact types at allocations, etc., to test reflection") \
2542 \
2543 develop(bool, EagerInitialization, false, \
2544 "Eagerly initialize classes if possible") \
2545 \
2546 develop(bool, TraceMethodReplacement, false, \
2547 "Print when methods are replaced do to recompilation") \
2548 \
2549 develop(bool, PrintMethodFlushing, false, \
2550 "print the nmethods being flushed") \
2551 \
2552 notproduct(bool, LogMultipleMutexLocking, false, \
2553 "log locking and unlocking of mutexes (only if multiple locks " \
2554 "are held)") \
2555 \
2556 develop(bool, UseRelocIndex, false, \
2557 "use an index to speed random access to relocations") \
2558 \
2559 develop(bool, StressCodeBuffers, false, \
2560 "Exercise code buffer expansion and other rare state changes") \
2561 \
2562 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2563 "Generate extra debugging info for non-safepoints in nmethods") \
2564 \
2565 diagnostic(bool, DebugInlinedCalls, true, \
2566 "If false, restricts profiled locations to the root method only") \
2567 \
2568 product(bool, PrintVMOptions, trueInDebug, \
2569 "Print flags that appeared on the command line") \
2570 \
2571 product(bool, IgnoreUnrecognizedVMOptions, false, \
2572 "Ignore unrecognized VM options") \
2573 \
2574 product(bool, PrintCommandLineFlags, false, \
2575 "Print flags specified on command line or set by ergonomics") \
2576 \
2577 product(bool, PrintFlagsInitial, false, \
2578 "Print all VM flags before argument processing and exit VM") \
2579 \
2580 product(bool, PrintFlagsFinal, false, \
2581 "Print all VM flags after argument and ergonomic processing") \
2582 \
2583 notproduct(bool, PrintFlagsWithComments, false, \
2584 "Print all VM flags with default values and descriptions and exit")\
2585 \
2586 diagnostic(bool, SerializeVMOutput, true, \
2587 "Use a mutex to serialize output to tty and hotspot.log") \
2588 \
2589 diagnostic(bool, DisplayVMOutput, true, \
2590 "Display all VM output on the tty, independently of LogVMOutput") \
2591 \
2592 diagnostic(bool, LogVMOutput, trueInDebug, \
2593 "Save VM output to hotspot.log, or to LogFile") \
2594 \
2595 diagnostic(ccstr, LogFile, NULL, \
2596 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2597 \
2598 product(ccstr, ErrorFile, NULL, \
2599 "If an error occurs, save the error data to this file " \
2600 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2601 \
2602 product(bool, DisplayVMOutputToStderr, false, \
2603 "If DisplayVMOutput is true, display all VM output to stderr") \
2604 \
2605 product(bool, DisplayVMOutputToStdout, false, \
2606 "If DisplayVMOutput is true, display all VM output to stdout") \
2607 \
2608 product(bool, UseHeavyMonitors, false, \
2609 "use heavyweight instead of lightweight Java monitors") \
2610 \
2611 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2612 "print histogram of the symbol table") \
2613 \
2614 notproduct(bool, ExitVMOnVerifyError, false, \
2615 "standard exit from VM if bytecode verify error " \
2616 "(only in debug mode)") \
2617 \
2618 notproduct(ccstr, AbortVMOnException, NULL, \
2619 "Call fatal if this exception is thrown. Example: " \
2620 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2621 \
2622 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2623 "Call fatal if the exception pointed by AbortVMOnException " \
2624 "has this message.") \
2625 \
2626 develop(bool, DebugVtables, false, \
2627 "add debugging code to vtable dispatch") \
2628 \
2629 develop(bool, PrintVtables, false, \
2630 "print vtables when printing klass") \
2631 \
2632 notproduct(bool, PrintVtableStats, false, \
2633 "print vtables stats at end of run") \
2634 \
2635 develop(bool, TraceCreateZombies, false, \
2636 "trace creation of zombie nmethods") \
2637 \
2638 notproduct(bool, IgnoreLockingAssertions, false, \
2639 "disable locking assertions (for speed)") \
2640 \
2641 notproduct(bool, VerifyLoopOptimizations, false, \
2642 "verify major loop optimizations") \
2643 \
2644 product(bool, RangeCheckElimination, true, \
2645 "Split loop iterations to eliminate range checks") \
2646 \
2647 develop_pd(bool, UncommonNullCast, \
2648 "track occurrences of null in casts; adjust compiler tactics") \
2649 \
2650 develop(bool, TypeProfileCasts, true, \
2651 "treat casts like calls for purposes of type profiling") \
2652 \
2653 develop(bool, MonomorphicArrayCheck, true, \
2654 "Uncommon-trap array store checks that require full type check") \
2655 \
2656 diagnostic(bool, ProfileDynamicTypes, true, \
2657 "do extra type profiling and use it more aggressively") \
2658 \
2659 develop(bool, DelayCompilationDuringStartup, true, \
2660 "Delay invoking the compiler until main application class is " \
2661 "loaded") \
2662 \
2663 develop(bool, CompileTheWorld, false, \
2664 "Compile all methods in all classes in bootstrap class path " \
2665 "(stress test)") \
2666 \
2667 develop(bool, CompileTheWorldPreloadClasses, true, \
2668 "Preload all classes used by a class before start loading") \
2669 \
2670 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2671 "Force a safepoint every n compiles so sweeper can keep up") \
2672 \
2673 develop(bool, TraceIterativeGVN, false, \
2674 "Print progress during Iterative Global Value Numbering") \
2675 \
2676 develop(bool, FillDelaySlots, true, \
2677 "Fill delay slots (on SPARC only)") \
2678 \
2679 develop(bool, VerifyIterativeGVN, false, \
2680 "Verify Def-Use modifications during sparse Iterative Global " \
2681 "Value Numbering") \
2682 \
2683 notproduct(bool, TracePhaseCCP, false, \
2684 "Print progress during Conditional Constant Propagation") \
2685 \
2686 develop(bool, TimeLivenessAnalysis, false, \
2687 "Time computation of bytecode liveness analysis") \
2688 \
2689 develop(bool, TraceLivenessGen, false, \
2690 "Trace the generation of liveness analysis information") \
2691 \
2692 notproduct(bool, TraceLivenessQuery, false, \
2693 "Trace queries of liveness analysis information") \
2694 \
2695 notproduct(bool, CollectIndexSetStatistics, false, \
2696 "Collect information about IndexSets") \
2697 \
2698 develop(bool, PrintDominators, false, \
2699 "Print out dominator trees for GVN") \
2700 \
2701 develop(bool, UseLoopSafepoints, true, \
2702 "Generate Safepoint nodes in every loop") \
2703 \
2704 notproduct(bool, TraceCISCSpill, false, \
2705 "Trace allocators use of cisc spillable instructions") \
2706 \
2707 notproduct(bool, TraceSpilling, false, \
2708 "Trace spilling") \
2709 \
2710 product(bool, SplitIfBlocks, true, \
2711 "Clone compares and control flow through merge points to fold " \
2712 "some branches") \
2713 \
2714 develop(intx, FastAllocateSizeLimit, 128*K, \
2715 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2716 "Inline allocations larger than this in doublewords must go slow")\
2717 \
2718 product(bool, AggressiveOpts, false, \
2719 "Enable aggressive optimizations - see arguments.cpp") \
2720 \
2721 product(bool, UseStringCache, false, \
2722 "Enable String cache capabilities on String.java") \
2723 \
2724 /* statistics */ \
2725 develop(bool, CountCompiledCalls, false, \
2726 "counts method invocations") \
2727 \
2728 notproduct(bool, CountRuntimeCalls, false, \
2729 "counts VM runtime calls") \
2730 \
2731 develop(bool, CountJNICalls, false, \
2732 "counts jni method invocations") \
2733 \
2734 notproduct(bool, CountJVMCalls, false, \
2735 "counts jvm method invocations") \
2736 \
2737 notproduct(bool, CountRemovableExceptions, false, \
2738 "count exceptions that could be replaced by branches due to " \
2739 "inlining") \
2740 \
2741 notproduct(bool, ICMissHistogram, false, \
2742 "produce histogram of IC misses") \
2743 \
2744 notproduct(bool, PrintClassStatistics, false, \
2745 "prints class statistics at end of run") \
2746 \
2747 notproduct(bool, PrintMethodStatistics, false, \
2748 "prints method statistics at end of run") \
2749 \
2750 /* interpreter */ \
2751 develop(bool, ClearInterpreterLocals, false, \
2752 "Always clear local variables of interpreter activations upon " \
2753 "entry") \
2754 \
2755 product_pd(bool, RewriteBytecodes, \
2756 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2757 \
2758 product_pd(bool, RewriteFrequentPairs, \
2759 "Rewrite frequently used bytecode pairs into a single bytecode") \
2760 \
2761 diagnostic(bool, PrintInterpreter, false, \
2762 "Prints the generated interpreter code") \
2763 \
2764 product(bool, UseInterpreter, true, \
2765 "Use interpreter for non-compiled methods") \
2766 \
2767 develop(bool, UseFastSignatureHandlers, true, \
2768 "Use fast signature handlers for native calls") \
2769 \
2770 develop(bool, UseV8InstrsOnly, false, \
2771 "Use SPARC-V8 Compliant instruction subset") \
2772 \
2773 product(bool, UseNiagaraInstrs, false, \
2774 "Use Niagara-efficient instruction subset") \
2775 \
2776 develop(bool, UseCASForSwap, false, \
2777 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2778 \
2779 product(bool, UseLoopCounter, true, \
2780 "Increment invocation counter on backward branch") \
2781 \
2782 product(bool, UseFastEmptyMethods, true, \
2783 "Use fast method entry code for empty methods") \
2784 \
2785 product(bool, UseFastAccessorMethods, true, \
2786 "Use fast method entry code for accessor methods") \
2787 \
2788 product_pd(bool, UseOnStackReplacement, \
2789 "Use on stack replacement, calls runtime if invoc. counter " \
2790 "overflows in loop") \
2791 \
2792 notproduct(bool, TraceOnStackReplacement, false, \
2793 "Trace on stack replacement") \
2794 \
2795 develop(bool, PoisonOSREntry, true, \
2796 "Detect abnormal calls to OSR code") \
2797 \
2798 product_pd(bool, PreferInterpreterNativeStubs, \
2799 "Use always interpreter stubs for native methods invoked via " \
2800 "interpreter") \
2801 \
2802 develop(bool, CountBytecodes, false, \
2803 "Count number of bytecodes executed") \
2804 \
2805 develop(bool, PrintBytecodeHistogram, false, \
2806 "Print histogram of the executed bytecodes") \
2807 \
2808 develop(bool, PrintBytecodePairHistogram, false, \
2809 "Print histogram of the executed bytecode pairs") \
2810 \
2811 diagnostic(bool, PrintSignatureHandlers, false, \
2812 "Print code generated for native method signature handlers") \
2813 \
2814 develop(bool, VerifyOops, false, \
2815 "Do plausibility checks for oops") \
2816 \
2817 develop(bool, CheckUnhandledOops, false, \
2818 "Check for unhandled oops in VM code") \
2819 \
2820 develop(bool, VerifyJNIFields, trueInDebug, \
2821 "Verify jfieldIDs for instance fields") \
2822 \
2823 notproduct(bool, VerifyJNIEnvThread, false, \
2824 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2825 "from JNI") \
2826 \
2827 develop(bool, VerifyFPU, false, \
2828 "Verify FPU state (check for NaN's, etc.)") \
2829 \
2830 develop(bool, VerifyThread, false, \
2831 "Watch the thread register for corruption (SPARC only)") \
2832 \
2833 develop(bool, VerifyActivationFrameSize, false, \
2834 "Verify that activation frame didn't become smaller than its " \
2835 "minimal size") \
2836 \
2837 develop(bool, TraceFrequencyInlining, false, \
2838 "Trace frequency based inlining") \
2839 \
2840 notproduct(bool, TraceTypeProfile, false, \
2841 "Trace type profile") \
2842 \
2843 develop_pd(bool, InlineIntrinsics, \
2844 "Inline intrinsics that can be statically resolved") \
2845 \
2846 product_pd(bool, ProfileInterpreter, \
2847 "Profile at the bytecode level during interpretation") \
2848 \
2849 develop_pd(bool, ProfileTraps, \
2850 "Profile deoptimization traps at the bytecode level") \
2851 \
2852 product(intx, ProfileMaturityPercentage, 20, \
2853 "number of method invocations/branches (expressed as % of " \
2854 "CompileThreshold) before using the method's profile") \
2855 \
2856 develop(bool, PrintMethodData, false, \
2857 "Print the results of +ProfileInterpreter at end of run") \
2858 \
2859 develop(bool, VerifyDataPointer, trueInDebug, \
2860 "Verify the method data pointer during interpreter profiling") \
2861 \
2862 develop(bool, VerifyCompiledCode, false, \
2863 "Include miscellaneous runtime verifications in nmethod code; " \
2864 "default off because it disturbs nmethod size heuristics") \
2865 \
2866 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2867 "Manually make GC thread crash then dump java stack trace; " \
2868 "Test only") \
2869 \
2870 /* compilation */ \
2871 product(bool, UseCompiler, true, \
2872 "use compilation") \
2873 \
2874 develop(bool, TraceCompilationPolicy, false, \
2875 "Trace compilation policy") \
2876 \
2877 develop(bool, TimeCompilationPolicy, false, \
2878 "Time the compilation policy") \
2879 \
2880 product(bool, UseCounterDecay, true, \
2881 "adjust recompilation counters") \
2882 \
2883 develop(intx, CounterHalfLifeTime, 30, \
2884 "half-life time of invocation counters (in secs)") \
2885 \
2886 develop(intx, CounterDecayMinIntervalLength, 500, \
2887 "Min. ms. between invocation of CounterDecay") \
2888 \
2889 product(bool, AlwaysCompileLoopMethods, false, \
2890 "when using recompilation, never interpret methods " \
2891 "containing loops") \
2892 \
2893 product(bool, DontCompileHugeMethods, true, \
2894 "don't compile methods > HugeMethodLimit") \
2895 \
2896 /* Bytecode escape analysis estimation. */ \
2897 product(bool, EstimateArgEscape, true, \
2898 "Analyze bytecodes to estimate escape state of arguments") \
2899 \
2900 product(intx, BCEATraceLevel, 0, \
2901 "How much tracing to do of bytecode escape analysis estimates") \
2902 \
2903 product(intx, MaxBCEAEstimateLevel, 5, \
2904 "Maximum number of nested calls that are analyzed by BC EA.") \
2905 \
2906 product(intx, MaxBCEAEstimateSize, 150, \
2907 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2908 \
2909 product(intx, AllocatePrefetchStyle, 1, \
2910 "0 = no prefetch, " \
2911 "1 = prefetch instructions for each allocation, " \
2912 "2 = use TLAB watermark to gate allocation prefetch, " \
2913 "3 = use BIS instruction on Sparc for allocation prefetch") \
2914 \
2915 product(intx, AllocatePrefetchDistance, -1, \
2916 "Distance to prefetch ahead of allocation pointer") \
2917 \
2918 product(intx, AllocatePrefetchLines, 3, \
2919 "Number of lines to prefetch ahead of array allocation pointer") \
2920 \
2921 product(intx, AllocateInstancePrefetchLines, 1, \
2922 "Number of lines to prefetch ahead of instance allocation pointer") \
2923 \
2924 product(intx, AllocatePrefetchStepSize, 16, \
2925 "Step size in bytes of sequential prefetch instructions") \
2926 \
2927 product(intx, AllocatePrefetchInstr, 0, \
2928 "Prefetch instruction to prefetch ahead of allocation pointer") \
2929 \
2930 product(intx, ReadPrefetchInstr, 0, \
2931 "Prefetch instruction to prefetch ahead") \
2932 \
2933 product(uintx, ArraycopySrcPrefetchDistance, 0, \
2934 "Distance to prefetch source array in arracopy") \
2935 \
2936 product(uintx, ArraycopyDstPrefetchDistance, 0, \
2937 "Distance to prefetch destination array in arracopy") \
2938 \
2939 /* deoptimization */ \
2940 develop(bool, TraceDeoptimization, false, \
2941 "Trace deoptimization") \
2942 \
2943 develop(bool, DebugDeoptimization, false, \
2944 "Tracing various information while debugging deoptimization") \
2945 \
2946 product(intx, SelfDestructTimer, 0, \
2947 "Will cause VM to terminate after a given time (in minutes) " \
2948 "(0 means off)") \
2949 \
2950 product(intx, MaxJavaStackTraceDepth, 1024, \
2951 "Max. no. of lines in the stack trace for Java exceptions " \
2952 "(0 means all)") \
2953 \
2954 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2955 "Guarantee a safepoint (at least) every so many milliseconds " \
2956 "(0 means none)")) \
2957 \
2958 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2959 "Guarantee a safepoint (at least) every so many milliseconds " \
2960 "(0 means none)")) \
2961 \
2962 product(intx, SafepointTimeoutDelay, 10000, \
2963 "Delay in milliseconds for option SafepointTimeout") \
2964 \
2965 product(intx, NmethodSweepFraction, 4, \
2966 "Number of invocations of sweeper to cover all nmethods") \
2967 \
2968 product(intx, NmethodSweepCheckInterval, 5, \
2969 "Compilers wake up every n seconds to possibly sweep nmethods") \
2970 \
2971 notproduct(bool, LogSweeper, false, \
2972 "Keep a ring buffer of sweeper activity") \
2973 \
2974 notproduct(intx, SweeperLogEntries, 1024, \
2975 "Number of records in the ring buffer of sweeper activity") \
2976 \
2977 notproduct(intx, MemProfilingInterval, 500, \
2978 "Time between each invocation of the MemProfiler") \
2979 \
2980 develop(intx, MallocCatchPtr, -1, \
2981 "Hit breakpoint when mallocing/freeing this pointer") \
2982 \
2983 notproduct(intx, AssertRepeat, 1, \
2984 "number of times to evaluate expression in assert " \
2985 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2986 \
2987 notproduct(ccstrlist, SuppressErrorAt, "", \
2988 "List of assertions (file:line) to muzzle") \
2989 \
2990 notproduct(uintx, HandleAllocationLimit, 1024, \
2991 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2992 "is used") \
2993 \
2994 develop(uintx, TotalHandleAllocationLimit, 1024, \
2995 "Threshold for total handle allocation when " \
2996 "+TraceHandleAllocation is used") \
2997 \
2998 develop(intx, StackPrintLimit, 100, \
2999 "number of stack frames to print in VM-level stack dump") \
3000 \
3001 notproduct(intx, MaxElementPrintSize, 256, \
3002 "maximum number of elements to print") \
3003 \
3004 notproduct(intx, MaxSubklassPrintSize, 4, \
3005 "maximum number of subklasses to print when printing klass") \
3006 \
3007 product(intx, MaxInlineLevel, 9, \
3008 "maximum number of nested calls that are inlined") \
3009 \
3010 product(intx, MaxRecursiveInlineLevel, 1, \
3011 "maximum number of nested recursive calls that are inlined") \
3012 \
3013 product_pd(intx, InlineSmallCode, \
3014 "Only inline already compiled methods if their code size is " \
3015 "less than this") \
3016 \
3017 product(intx, MaxInlineSize, 35, \
3018 "maximum bytecode size of a method to be inlined") \
3019 \
3020 product_pd(intx, FreqInlineSize, \
3021 "maximum bytecode size of a frequent method to be inlined") \
3022 \
3023 product(intx, MaxTrivialSize, 6, \
3024 "maximum bytecode size of a trivial method to be inlined") \
3025 \
3026 product(intx, MinInliningThreshold, 250, \
3027 "min. invocation count a method needs to have to be inlined") \
3028 \
3029 develop(intx, AlignEntryCode, 4, \
3030 "aligns entry code to specified value (in bytes)") \
3031 \
3032 develop(intx, MethodHistogramCutoff, 100, \
3033 "cutoff value for method invoc. histogram (+CountCalls)") \
3034 \
3035 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3036 "# of interpreted methods to show in profile") \
3037 \
3038 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3039 "# of compiled methods to show in profile") \
3040 \
3041 develop(intx, ProfilerNumberOfStubMethods, 25, \
3042 "# of stub methods to show in profile") \
3043 \
3044 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3045 "# of runtime stub nodes to show in profile") \
3046 \
3047 product(intx, ProfileIntervalsTicks, 100, \
3048 "# of ticks between printing of interval profile " \
3049 "(+ProfileIntervals)") \
3050 \
3051 notproduct(intx, ScavengeALotInterval, 1, \
3052 "Interval between which scavenge will occur with +ScavengeALot") \
3053 \
3054 notproduct(intx, FullGCALotInterval, 1, \
3055 "Interval between which full gc will occur with +FullGCALot") \
3056 \
3057 notproduct(intx, FullGCALotStart, 0, \
3058 "For which invocation to start FullGCAlot") \
3059 \
3060 notproduct(intx, FullGCALotDummies, 32*K, \
3061 "Dummy object allocated with +FullGCALot, forcing all objects " \
3062 "to move") \
3063 \
3064 develop(intx, DontYieldALotInterval, 10, \
3065 "Interval between which yields will be dropped (milliseconds)") \
3066 \
3067 develop(intx, MinSleepInterval, 1, \
3068 "Minimum sleep() interval (milliseconds) when " \
3069 "ConvertSleepToYield is off (used for SOLARIS)") \
3070 \
3071 product(intx, EventLogLength, 2000, \
3072 "maximum nof events in event log") \
3073 \
3074 develop(intx, ProfilerPCTickThreshold, 15, \
3075 "Number of ticks in a PC buckets to be a hotspot") \
3076 \
3077 notproduct(intx, DeoptimizeALotInterval, 5, \
3078 "Number of exits until DeoptimizeALot kicks in") \
3079 \
3080 notproduct(intx, ZombieALotInterval, 5, \
3081 "Number of exits until ZombieALot kicks in") \
3082 \
3083 develop(bool, StressNonEntrant, false, \
3084 "Mark nmethods non-entrant at registration") \
3085 \
3086 diagnostic(intx, MallocVerifyInterval, 0, \
3087 "if non-zero, verify C heap after every N calls to " \
3088 "malloc/realloc/free") \
3089 \
3090 diagnostic(intx, MallocVerifyStart, 0, \
3091 "if non-zero, start verifying C heap after Nth call to " \
3092 "malloc/realloc/free") \
3093 \
3094 product(intx, TypeProfileWidth, 2, \
3095 "number of receiver types to record in call/cast profile") \
3096 \
3097 develop(intx, BciProfileWidth, 2, \
3098 "number of return bci's to record in ret profile") \
3099 \
3100 product(intx, PerMethodRecompilationCutoff, 400, \
3101 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3102 \
3103 product(intx, PerBytecodeRecompilationCutoff, 200, \
3104 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3105 \
3106 product(intx, PerMethodTrapLimit, 100, \
3107 "Limit on traps (of one kind) in a method (includes inlines)") \
3108 \
3109 product(intx, PerBytecodeTrapLimit, 4, \
3110 "Limit on traps (of one kind) at a particular BCI") \
3111 \
3112 develop(intx, FreqCountInvocations, 1, \
3113 "Scaling factor for branch frequencies (deprecated)") \
3114 \
3115 develop(intx, InlineFrequencyRatio, 20, \
3116 "Ratio of call site execution to caller method invocation") \
3117 \
3118 develop_pd(intx, InlineFrequencyCount, \
3119 "Count of call site execution necessary to trigger frequent " \
3120 "inlining") \
3121 \
3122 develop(intx, InlineThrowCount, 50, \
3123 "Force inlining of interpreted methods that throw this often") \
3124 \
3125 develop(intx, InlineThrowMaxSize, 200, \
3126 "Force inlining of throwing methods smaller than this") \
3127 \
3128 product(intx, AliasLevel, 3, \
3129 "0 for no aliasing, 1 for oop/field/static/array split, " \
3130 "2 for class split, 3 for unique instances") \
3131 \
3132 develop(bool, VerifyAliases, false, \
3133 "perform extra checks on the results of alias analysis") \
3134 \
3135 develop(intx, ProfilerNodeSize, 1024, \
3136 "Size in K to allocate for the Profile Nodes of each thread") \
3137 \
3138 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
3139 "Number of times to spin wait on a v8 atomic operation lock") \
3140 \
3141 product(intx, ReadSpinIterations, 100, \
3142 "Number of read attempts before a yield (spin inner loop)") \
3143 \
3144 product_pd(intx, PreInflateSpin, \
3145 "Number of times to spin wait before inflation") \
3146 \
3147 product(intx, PreBlockSpin, 10, \
3148 "Number of times to spin in an inflated lock before going to " \
3149 "an OS lock") \
3150 \
3151 /* gc parameters */ \
3152 product(uintx, InitialHeapSize, 0, \
3153 "Initial heap size (in bytes); zero means OldSize + NewSize") \
3154 \
3155 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3156 "Maximum heap size (in bytes)") \
3157 \
3158 product(uintx, OldSize, ScaleForWordSize(4*M), \
3159 "Initial tenured generation size (in bytes)") \
3160 \
3161 product(uintx, NewSize, ScaleForWordSize(1*M), \
3162 "Initial new generation size (in bytes)") \
3163 \
3164 product(uintx, MaxNewSize, max_uintx, \
3165 "Maximum new generation size (in bytes), max_uintx means set " \
3166 "ergonomically") \
3167 \
3168 product(uintx, PretenureSizeThreshold, 0, \
3169 "Maximum size in bytes of objects allocated in DefNew " \
3170 "generation; zero means no maximum") \
3171 \
3172 product(uintx, TLABSize, 0, \
3173 "Starting TLAB size (in bytes); zero means set ergonomically") \
3174 \
3175 product(uintx, MinTLABSize, 2*K, \
3176 "Minimum allowed TLAB size (in bytes)") \
3177 \
3178 product(uintx, TLABAllocationWeight, 35, \
3179 "Allocation averaging weight") \
3180 \
3181 product(uintx, TLABWasteTargetPercent, 1, \
3182 "Percentage of Eden that can be wasted") \
3183 \
3184 product(uintx, TLABRefillWasteFraction, 64, \
3185 "Max TLAB waste at a refill (internal fragmentation)") \
3186 \
3187 product(uintx, TLABWasteIncrement, 4, \
3188 "Increment allowed waste at slow allocation") \
3189 \
3190 product(intx, SurvivorRatio, 8, \
3191 "Ratio of eden/survivor space size") \
3192 \
3193 product(intx, NewRatio, 2, \
3194 "Ratio of new/old generation sizes") \
3195 \
3196 product_pd(uintx, NewSizeThreadIncrease, \
3197 "Additional size added to desired new generation size per " \
3198 "non-daemon thread (in bytes)") \
3199 \
3200 product_pd(uintx, PermSize, \
3201 "Initial size of permanent generation (in bytes)") \
3202 \
3203 product_pd(uintx, MaxPermSize, \
3204 "Maximum size of permanent generation (in bytes)") \
3205 \
3206 product(uintx, MinHeapFreeRatio, 40, \
3207 "Min percentage of heap free after GC to avoid expansion") \
3208 \
3209 product(uintx, MaxHeapFreeRatio, 70, \
3210 "Max percentage of heap free after GC to avoid shrinking") \
3211 \
3212 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3213 "Number of milliseconds per MB of free space in the heap") \
3214 \
3215 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3216 "Min change in heap space due to GC (in bytes)") \
3217 \
3218 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
3219 "Min expansion of permanent heap (in bytes)") \
3220 \
3221 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3222 "Max expansion of permanent heap without full GC (in bytes)") \
3223 \
3224 product(intx, QueuedAllocationWarningCount, 0, \
3225 "Number of times an allocation that queues behind a GC " \
3226 "will retry before printing a warning") \
3227 \
3228 diagnostic(uintx, VerifyGCStartAt, 0, \
3229 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3230 \
3231 diagnostic(intx, VerifyGCLevel, 0, \
3232 "Generation level at which to start +VerifyBefore/AfterGC") \
3233 \
3234 develop(uintx, ExitAfterGCNum, 0, \
3235 "If non-zero, exit after this GC.") \
3236 \
3237 product(intx, MaxTenuringThreshold, 15, \
3238 "Maximum value for tenuring threshold") \
3239 \
3240 product(intx, InitialTenuringThreshold, 7, \
3241 "Initial value for tenuring threshold") \
3242 \
3243 product(intx, TargetSurvivorRatio, 50, \
3244 "Desired percentage of survivor space used after scavenge") \
3245 \
3246 product(uintx, MarkSweepDeadRatio, 5, \
3247 "Percentage (0-100) of the old gen allowed as dead wood." \
3248 "Serial mark sweep treats this as both the min and max value." \
3249 "CMS uses this value only if it falls back to mark sweep." \
3250 "Par compact uses a variable scale based on the density of the" \
3251 "generation and treats this as the max value when the heap is" \
3252 "either completely full or completely empty. Par compact also" \
3253 "has a smaller default value; see arguments.cpp.") \
3254 \
3255 product(uintx, PermMarkSweepDeadRatio, 20, \
3256 "Percentage (0-100) of the perm gen allowed as dead wood." \
3257 "See MarkSweepDeadRatio for collector-specific comments.") \
3258 \
3259 product(intx, MarkSweepAlwaysCompactCount, 4, \
3260 "How often should we fully compact the heap (ignoring the dead " \
3261 "space parameters)") \
3262 \
3263 product(intx, PrintCMSStatistics, 0, \
3264 "Statistics for CMS") \
3265 \
3266 product(bool, PrintCMSInitiationStatistics, false, \
3267 "Statistics for initiating a CMS collection") \
3268 \
3269 product(intx, PrintFLSStatistics, 0, \
3270 "Statistics for CMS' FreeListSpace") \
3271 \
3272 product(intx, PrintFLSCensus, 0, \
3273 "Census for CMS' FreeListSpace") \
3274 \
3275 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3276 "Delay in ms between expansion and allocation") \
3277 \
3278 product(intx, DeferThrSuspendLoopCount, 4000, \
3279 "(Unstable) Number of times to iterate in safepoint loop " \
3280 " before blocking VM threads ") \
3281 \
3282 product(intx, DeferPollingPageLoopCount, -1, \
3283 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3284 "before changing safepoint polling page to RO ") \
3285 \
3286 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3287 \
3288 product(bool, PSChunkLargeArrays, true, \
3289 "true: process large arrays in chunks") \
3290 \
3291 product(uintx, GCDrainStackTargetSize, 64, \
3292 "how many entries we'll try to leave on the stack during " \
3293 "parallel GC") \
3294 \
3295 /* stack parameters */ \
3296 product_pd(intx, StackYellowPages, \
3297 "Number of yellow zone (recoverable overflows) pages") \
3298 \
3299 product_pd(intx, StackRedPages, \
3300 "Number of red zone (unrecoverable overflows) pages") \
3301 \
3302 product_pd(intx, StackShadowPages, \
3303 "Number of shadow zone (for overflow checking) pages" \
3304 " this should exceed the depth of the VM and native call stack") \
3305 \
3306 product_pd(intx, ThreadStackSize, \
3307 "Thread Stack Size (in Kbytes)") \
3308 \
3309 product_pd(intx, VMThreadStackSize, \
3310 "Non-Java Thread Stack Size (in Kbytes)") \
3311 \
3312 product_pd(intx, CompilerThreadStackSize, \
3313 "Compiler Thread Stack Size (in Kbytes)") \
3314 \
3315 develop_pd(uintx, JVMInvokeMethodSlack, \
3316 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3317 \
3318 product(uintx, ThreadSafetyMargin, 50*M, \
3319 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3320 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3321 "disable this feature") \
3322 \
3323 /* code cache parameters */ \
3324 develop(uintx, CodeCacheSegmentSize, 64, \
3325 "Code cache segment size (in bytes) - smallest unit of " \
3326 "allocation") \
3327 \
3328 develop_pd(intx, CodeEntryAlignment, \
3329 "Code entry alignment for generated code (in bytes)") \
3330 \
3331 product_pd(intx, OptoLoopAlignment, \
3332 "Align inner loops to zero relative to this modulus") \
3333 \
3334 product_pd(uintx, InitialCodeCacheSize, \
3335 "Initial code cache size (in bytes)") \
3336 \
3337 product_pd(uintx, ReservedCodeCacheSize, \
3338 "Reserved code cache size (in bytes) - maximum code cache size") \
3339 \
3340 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3341 "When less than X space left, we stop compiling.") \
3342 \
3343 product_pd(uintx, CodeCacheExpansionSize, \
3344 "Code cache expansion size (in bytes)") \
3345 \
3346 develop_pd(uintx, CodeCacheMinBlockLength, \
3347 "Minimum number of segments in a code cache block.") \
3348 \
3349 notproduct(bool, ExitOnFullCodeCache, false, \
3350 "Exit the VM if we fill the code cache.") \
3351 \
3352 product(bool, UseCodeCacheFlushing, false, \
3353 "Attempt to clean the code cache before shutting off compiler") \
3354 \
3355 product(intx, MinCodeCacheFlushingInterval, 30, \
3356 "Min number of seconds between code cache cleaning sessions") \
3357 \
3358 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3359 "When less than X space left, start code cache cleaning") \
3360 \
3361 /* interpreter debugging */ \
3362 develop(intx, BinarySwitchThreshold, 5, \
3363 "Minimal number of lookupswitch entries for rewriting to binary " \
3364 "switch") \
3365 \
3366 develop(intx, StopInterpreterAt, 0, \
3367 "Stops interpreter execution at specified bytecode number") \
3368 \
3369 develop(intx, TraceBytecodesAt, 0, \
3370 "Traces bytecodes starting with specified bytecode number") \
3371 \
3372 /* compiler interface */ \
3373 develop(intx, CIStart, 0, \
3374 "the id of the first compilation to permit") \
3375 \
3376 develop(intx, CIStop, -1, \
3377 "the id of the last compilation to permit") \
3378 \
3379 develop(intx, CIStartOSR, 0, \
3380 "the id of the first osr compilation to permit " \
3381 "(CICountOSR must be on)") \
3382 \
3383 develop(intx, CIStopOSR, -1, \
3384 "the id of the last osr compilation to permit " \
3385 "(CICountOSR must be on)") \
3386 \
3387 develop(intx, CIBreakAtOSR, -1, \
3388 "id of osr compilation to break at") \
3389 \
3390 develop(intx, CIBreakAt, -1, \
3391 "id of compilation to break at") \
3392 \
3393 product(ccstrlist, CompileOnly, "", \
3394 "List of methods (pkg/class.name) to restrict compilation to") \
3395 \
3396 product(ccstr, CompileCommandFile, NULL, \
3397 "Read compiler commands from this file [.hotspot_compiler]") \
3398 \
3399 product(ccstrlist, CompileCommand, "", \
3400 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3401 \
3402 product(bool, CICompilerCountPerCPU, false, \
3403 "1 compiler thread for log(N CPUs)") \
3404 \
3405 develop(intx, CIFireOOMAt, -1, \
3406 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3407 "(non-negative value throws OOM after this many CI accesses " \
3408 "in each compile)") \
3409 \
3410 develop(intx, CIFireOOMAtDelay, -1, \
3411 "Wait for this many CI accesses to occur in all compiles before " \
3412 "beginning to throw OutOfMemoryErrors in each compile") \
3413 \
3414 notproduct(bool, CIObjectFactoryVerify, false, \
3415 "enable potentially expensive verification in ciObjectFactory") \
3416 \
3417 /* Priorities */ \
3418 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3419 \
3420 product(intx, ThreadPriorityPolicy, 0, \
3421 "0 : Normal. "\
3422 " VM chooses priorities that are appropriate for normal "\
3423 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3424 " to normal native priority. Java priorities below NORM_PRIORITY"\
3425 " map to lower native priority values. On Windows applications"\
3426 " are allowed to use higher native priorities. However, with "\
3427 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3428 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3429 " interfere with system threads. On Linux thread priorities "\
3430 " are ignored because the OS does not support static priority "\
3431 " in SCHED_OTHER scheduling class which is the only choice for"\
3432 " non-root, non-realtime applications. "\
3433 "1 : Aggressive. "\
3434 " Java thread priorities map over to the entire range of "\
3435 " native thread priorities. Higher Java thread priorities map "\
3436 " to higher native thread priorities. This policy should be "\
3437 " used with care, as sometimes it can cause performance "\
3438 " degradation in the application and/or the entire system. On "\
3439 " Linux this policy requires root privilege.") \
3440 \
3441 product(bool, ThreadPriorityVerbose, false, \
3442 "print priority changes") \
3443 \
3444 product(intx, DefaultThreadPriority, -1, \
3445 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3446 \
3447 product(intx, CompilerThreadPriority, -1, \
3448 "what priority should compiler threads run at (-1 means no change)") \
3449 \
3450 product(intx, VMThreadPriority, -1, \
3451 "what priority should VM threads run at (-1 means no change)") \
3452 \
3453 product(bool, CompilerThreadHintNoPreempt, true, \
3454 "(Solaris only) Give compiler threads an extra quanta") \
3455 \
3456 product(bool, VMThreadHintNoPreempt, false, \
3457 "(Solaris only) Give VM thread an extra quanta") \
3458 \
3459 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3460 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3461 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3462 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3463 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3464 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3465 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3466 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3467 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3468 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3469 \
3470 /* compiler debugging */ \
3471 notproduct(intx, CompileTheWorldStartAt, 1, \
3472 "First class to consider when using +CompileTheWorld") \
3473 \
3474 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3475 "Last class to consider when using +CompileTheWorld") \
3476 \
3477 develop(intx, NewCodeParameter, 0, \
3478 "Testing Only: Create a dedicated integer parameter before " \
3479 "putback") \
3480 \
3481 /* new oopmap storage allocation */ \
3482 develop(intx, MinOopMapAllocation, 8, \
3483 "Minimum number of OopMap entries in an OopMapSet") \
3484 \
3485 /* Background Compilation */ \
3486 develop(intx, LongCompileThreshold, 50, \
3487 "Used with +TraceLongCompiles") \
3488 \
3489 product(intx, StarvationMonitorInterval, 200, \
3490 "Pause between each check in ms") \
3491 \
3492 /* recompilation */ \
3493 product_pd(intx, CompileThreshold, \
3494 "number of interpreted method invocations before (re-)compiling") \
3495 \
3496 product_pd(intx, BackEdgeThreshold, \
3497 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3498 \
3499 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3500 "Interpreter (tier 0) invocation notification frequency.") \
3501 \
3502 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3503 "C1 without MDO (tier 2) invocation notification frequency.") \
3504 \
3505 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3506 "C1 with MDO profiling (tier 3) invocation notification " \
3507 "frequency.") \
3508 \
3509 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3510 "Interpreter (tier 0) invocation notification frequency.") \
3511 \
3512 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3513 "C1 without MDO (tier 2) invocation notification frequency.") \
3514 \
3515 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3516 "C1 with MDO profiling (tier 3) invocation notification " \
3517 "frequency.") \
3518 \
3519 product(intx, Tier2CompileThreshold, 0, \
3520 "threshold at which tier 2 compilation is invoked") \
3521 \
3522 product(intx, Tier2BackEdgeThreshold, 0, \
3523 "Back edge threshold at which tier 2 compilation is invoked") \
3524 \
3525 product(intx, Tier3InvocationThreshold, 200, \
3526 "Compile if number of method invocations crosses this " \
3527 "threshold") \
3528 \
3529 product(intx, Tier3MinInvocationThreshold, 100, \
3530 "Minimum invocation to compile at tier 3") \
3531 \
3532 product(intx, Tier3CompileThreshold, 2000, \
3533 "Threshold at which tier 3 compilation is invoked (invocation " \
3534 "minimum must be satisfied.") \
3535 \
3536 product(intx, Tier3BackEdgeThreshold, 7000, \
3537 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3538 \
3539 product(intx, Tier4InvocationThreshold, 5000, \
3540 "Compile if number of method invocations crosses this " \
3541 "threshold") \
3542 \
3543 product(intx, Tier4MinInvocationThreshold, 600, \
3544 "Minimum invocation to compile at tier 4") \
3545 \
3546 product(intx, Tier4CompileThreshold, 15000, \
3547 "Threshold at which tier 4 compilation is invoked (invocation " \
3548 "minimum must be satisfied.") \
3549 \
3550 product(intx, Tier4BackEdgeThreshold, 40000, \
3551 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3552 \
3553 product(intx, Tier3DelayOn, 5, \
3554 "If C2 queue size grows over this amount per compiler thread " \
3555 "stop compiling at tier 3 and start compiling at tier 2") \
3556 \
3557 product(intx, Tier3DelayOff, 2, \
3558 "If C2 queue size is less than this amount per compiler thread " \
3559 "allow methods compiled at tier 2 transition to tier 3") \
3560 \
3561 product(intx, Tier3LoadFeedback, 5, \
3562 "Tier 3 thresholds will increase twofold when C1 queue size " \
3563 "reaches this amount per compiler thread") \
3564 \
3565 product(intx, Tier4LoadFeedback, 3, \
3566 "Tier 4 thresholds will increase twofold when C2 queue size " \
3567 "reaches this amount per compiler thread") \
3568 \
3569 product(intx, TieredCompileTaskTimeout, 50, \
3570 "Kill compile task if method was not used within " \
3571 "given timeout in milliseconds") \
3572 \
3573 product(intx, TieredStopAtLevel, 4, \
3574 "Stop at given compilation level") \
3575 \
3576 product(intx, Tier0ProfilingStartPercentage, 200, \
3577 "Start profiling in interpreter if the counters exceed tier 3" \
3578 "thresholds by the specified percentage") \
3579 \
3580 product(intx, TieredRateUpdateMinTime, 1, \
3581 "Minimum rate sampling interval (in milliseconds)") \
3582 \
3583 product(intx, TieredRateUpdateMaxTime, 25, \
3584 "Maximum rate sampling interval (in milliseconds)") \
3585 \
3586 product_pd(bool, TieredCompilation, \
3587 "Enable tiered compilation") \
3588 \
3589 product(bool, PrintTieredEvents, false, \
3590 "Print tiered events notifications") \
3591 \
3592 product(bool, StressTieredRuntime, false, \
3593 "Alternate client and server compiler on compile requests") \
3594 \
3595 product_pd(intx, OnStackReplacePercentage, \
3596 "NON_TIERED number of method invocations/branches (expressed as %"\
3597 "of CompileThreshold) before (re-)compiling OSR code") \
3598 \
3599 product(intx, InterpreterProfilePercentage, 33, \
3600 "NON_TIERED number of method invocations/branches (expressed as %"\
3601 "of CompileThreshold) before profiling in the interpreter") \
3602 \
3603 develop(intx, MaxRecompilationSearchLength, 10, \
3604 "max. # frames to inspect searching for recompilee") \
3605 \
3606 develop(intx, MaxInterpretedSearchLength, 3, \
3607 "max. # interp. frames to skip when searching for recompilee") \
3608 \
3609 develop(intx, DesiredMethodLimit, 8000, \
3610 "desired max. method size (in bytecodes) after inlining") \
3611 \
3612 develop(intx, HugeMethodLimit, 8000, \
3613 "don't compile methods larger than this if " \
3614 "+DontCompileHugeMethods") \
3615 \
3616 /* New JDK 1.4 reflection implementation */ \
3617 \
3618 develop(bool, UseNewReflection, true, \
3619 "Temporary flag for transition to reflection based on dynamic " \
3620 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3621 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3622 "changes were needed") \
3623 \
3624 develop(bool, VerifyReflectionBytecodes, false, \
3625 "Force verification of 1.4 reflection bytecodes. Does not work " \
3626 "in situations like that described in 4486457 or for " \
3627 "constructors generated for serialization, so can not be enabled "\
3628 "in product.") \
3629 \
3630 product(bool, ReflectionWrapResolutionErrors, true, \
3631 "Temporary flag for transition to AbstractMethodError wrapped " \
3632 "in InvocationTargetException. See 6531596") \
3633 \
3634 \
3635 develop(intx, FastSuperclassLimit, 8, \
3636 "Depth of hardwired instanceof accelerator array") \
3637 \
3638 /* Properties for Java libraries */ \
3639 \
3640 product(intx, MaxDirectMemorySize, -1, \
3641 "Maximum total size of NIO direct-buffer allocations") \
3642 \
3643 /* temporary developer defined flags */ \
3644 \
3645 diagnostic(bool, UseNewCode, false, \
3646 "Testing Only: Use the new version while testing") \
3647 \
3648 diagnostic(bool, UseNewCode2, false, \
3649 "Testing Only: Use the new version while testing") \
3650 \
3651 diagnostic(bool, UseNewCode3, false, \
3652 "Testing Only: Use the new version while testing") \
3653 \
3654 /* flags for performance data collection */ \
3655 \
3656 product(bool, UsePerfData, falseInEmbedded, \
3657 "Flag to disable jvmstat instrumentation for performance testing" \
3658 "and problem isolation purposes.") \
3659 \
3660 product(bool, PerfDataSaveToFile, false, \
3661 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3662 \
3663 product(ccstr, PerfDataSaveFile, NULL, \
3664 "Save PerfData memory to the specified absolute pathname," \
3665 "%p in the file name if present will be replaced by pid") \
3666 \
3667 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3668 "Data sampling interval in milliseconds") \
3669 \
3670 develop(bool, PerfTraceDataCreation, false, \
3671 "Trace creation of Performance Data Entries") \
3672 \
3673 develop(bool, PerfTraceMemOps, false, \
3674 "Trace PerfMemory create/attach/detach calls") \
3675 \
3676 product(bool, PerfDisableSharedMem, false, \
3677 "Store performance data in standard memory") \
3678 \
3679 product(intx, PerfDataMemorySize, 32*K, \
3680 "Size of performance data memory region. Will be rounded " \
3681 "up to a multiple of the native os page size.") \
3682 \
3683 product(intx, PerfMaxStringConstLength, 1024, \
3684 "Maximum PerfStringConstant string length before truncation") \
3685 \
3686 product(bool, PerfAllowAtExitRegistration, false, \
3687 "Allow registration of atexit() methods") \
3688 \
3689 product(bool, PerfBypassFileSystemCheck, false, \
3690 "Bypass Win32 file system criteria checks (Windows Only)") \
3691 \
3692 product(intx, UnguardOnExecutionViolation, 0, \
3693 "Unguard page and retry on no-execute fault (Win32 only)" \
3694 "0=off, 1=conservative, 2=aggressive") \
3695 \
3696 /* Serviceability Support */ \
3697 \
3698 product(bool, ManagementServer, false, \
3699 "Create JMX Management Server") \
3700 \
3701 product(bool, DisableAttachMechanism, false, \
3702 "Disable mechanism that allows tools to attach to this VM") \
3703 \
3704 product(bool, StartAttachListener, false, \
3705 "Always start Attach Listener at VM startup") \
3706 \
3707 manageable(bool, PrintConcurrentLocks, false, \
3708 "Print java.util.concurrent locks in thread dump") \
3709 \
3710 product(bool, TransmitErrorReport, false, \
3711 "Enable error report transmission on erroneous termination") \
3712 \
3713 product(ccstr, ErrorReportServer, NULL, \
3714 "Override built-in error report server address") \
3715 \
3716 /* Shared spaces */ \
3717 \
3718 product(bool, UseSharedSpaces, true, \
3719 "Use shared spaces in the permanent generation") \
3720 \
3721 product(bool, RequireSharedSpaces, false, \
3722 "Require shared spaces in the permanent generation") \
3723 \
3724 product(bool, DumpSharedSpaces, false, \
3725 "Special mode: JVM reads a class list, loads classes, builds " \
3726 "shared spaces, and dumps the shared spaces to a file to be " \
3727 "used in future JVM runs.") \
3728 \
3729 product(bool, PrintSharedSpaces, false, \
3730 "Print usage of shared spaces") \
3731 \
3732 product(uintx, SharedDummyBlockSize, 512*M, \
3733 "Size of dummy block used to shift heap addresses (in bytes)") \
3734 \
3735 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \
3736 "Size of read-write space in permanent generation (in bytes)") \
3737 \
3738 product(uintx, SharedReadOnlySize, 10*M, \
3739 "Size of read-only space in permanent generation (in bytes)") \
3740 \
3741 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \
3742 "Size of the shared data area adjacent to the heap (in bytes)") \
3743 \
3744 product(uintx, SharedMiscCodeSize, 4*M, \
3745 "Size of the shared code area adjacent to the heap (in bytes)") \
3746 \
3747 diagnostic(bool, SharedOptimizeColdStart, true, \
3748 "At dump time, order shared objects to achieve better " \
3749 "cold startup time.") \
3750 \
3751 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3752 "Reordering policy for SharedOptimizeColdStart " \
3753 "0=favor classload-time locality, 1=balanced, " \
3754 "2=favor runtime locality") \
3755 \
3756 diagnostic(bool, SharedSkipVerify, false, \
3757 "Skip assert() and verify() which page-in unwanted shared " \
3758 "objects. ") \
3759 \
3760 diagnostic(bool, EnableInvokeDynamic, true, \
3761 "support JSR 292 (method handles, invokedynamic, " \
3762 "anonymous classes") \
3763 \
3764 product(bool, AnonymousClasses, false, \
3765 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \
3766 \
3767 experimental(bool, EnableMethodHandles, false, \
3768 "support method handles (deprecated)") \
3769 \
3770 diagnostic(intx, MethodHandlePushLimit, 3, \
3771 "number of additional stack slots a method handle may push") \
3772 \
3773 diagnostic(bool, PrintMethodHandleStubs, false, \
3774 "Print generated stub code for method handles") \
3775 \
3776 develop(bool, TraceMethodHandles, false, \
3777 "trace internal method handle operations") \
3778 \
3779 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3780 "perform extra checks when constructing method handles") \
3781 \
3782 diagnostic(bool, OptimizeMethodHandles, true, \
3783 "when constructing method handles, try to improve them") \
3784 \
3785 develop(bool, StressMethodHandleWalk, false, \
3786 "Process all method handles with MethodHandleWalk") \
3787 \
3788 diagnostic(bool, UseRicochetFrames, true, \
3789 "use ricochet stack frames for method handle combination, " \
3790 "if the platform supports them") \
3791 \
3792 experimental(bool, TrustFinalNonStaticFields, false, \
3793 "trust final non-static declarations for constant folding") \
3794 \
3795 experimental(bool, AllowInvokeGeneric, false, \
3796 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \
3797 "as equivalent methods") \
3798 \
3799 develop(bool, TraceInvokeDynamic, false, \
3800 "trace internal invoke dynamic operations") \
3801 \
3802 diagnostic(bool, PauseAtStartup, false, \
3803 "Causes the VM to pause at startup time and wait for the pause " \
3804 "file to be removed (default: ./vm.paused.<pid>)") \
3805 \
3806 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3807 "The file to create and for whose removal to await when pausing " \
3808 "at startup. (default: ./vm.paused.<pid>)") \
3809 \
3810 diagnostic(bool, PauseAtExit, false, \
3811 "Pause and wait for keypress on exit if a debugger is attached") \
3812 \
3813 product(bool, ExtendedDTraceProbes, false, \
3814 "Enable performance-impacting dtrace probes") \
3815 \
3816 product(bool, DTraceMethodProbes, false, \
3817 "Enable dtrace probes for method-entry and method-exit") \
3818 \
3819 product(bool, DTraceAllocProbes, false, \
3820 "Enable dtrace probes for object allocation") \
3821 \
3822 product(bool, DTraceMonitorProbes, false, \
3823 "Enable dtrace probes for monitor events") \
3824 \
3825 product(bool, RelaxAccessControlCheck, false, \
3826 "Relax the access control checks in the verifier") \
3827 \
3828 diagnostic(bool, PrintDTraceDOF, false, \
3829 "Print the DTrace DOF passed to the system for JSDT probes") \
3830 \
3831 product(uintx, StringTableSize, 1009, \
3832 "Number of buckets in the interned String table") \
3833 \
3834 product(bool, UseVMInterruptibleIO, false, \
3835 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3836 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3837 " of this flag is true for JDK 6 and earliers")
3839 /*
3840 * Macros for factoring of globals
3841 */
3843 // Interface macros
3844 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3845 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3846 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3847 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3848 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3849 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3850 #ifdef PRODUCT
3851 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3852 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3853 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3854 #else
3855 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3856 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3857 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3858 #endif
3859 // Special LP64 flags, product only needed for now.
3860 #ifdef _LP64
3861 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3862 #else
3863 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3864 #endif // _LP64
3866 // Implementation macros
3867 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3868 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3869 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3870 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3871 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3872 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3873 #ifdef PRODUCT
3874 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3875 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3876 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3877 #else
3878 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3879 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3880 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3881 #endif
3882 #ifdef _LP64
3883 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3884 #else
3885 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3886 #endif // _LP64
3888 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)
3890 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3892 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
