Fri, 02 Dec 2011 08:52:53 -0500
Merge
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_FAMILY_bsd
54 # include "globals_bsd.hpp"
55 #endif
56 #ifdef TARGET_OS_ARCH_linux_x86
57 # include "globals_linux_x86.hpp"
58 #endif
59 #ifdef TARGET_OS_ARCH_linux_sparc
60 # include "globals_linux_sparc.hpp"
61 #endif
62 #ifdef TARGET_OS_ARCH_linux_zero
63 # include "globals_linux_zero.hpp"
64 #endif
65 #ifdef TARGET_OS_ARCH_solaris_x86
66 # include "globals_solaris_x86.hpp"
67 #endif
68 #ifdef TARGET_OS_ARCH_solaris_sparc
69 # include "globals_solaris_sparc.hpp"
70 #endif
71 #ifdef TARGET_OS_ARCH_windows_x86
72 # include "globals_windows_x86.hpp"
73 #endif
74 #ifdef TARGET_OS_ARCH_linux_arm
75 # include "globals_linux_arm.hpp"
76 #endif
77 #ifdef TARGET_OS_ARCH_linux_ppc
78 # include "globals_linux_ppc.hpp"
79 #endif
80 #ifdef TARGET_OS_ARCH_bsd_x86
81 # include "globals_bsd_x86.hpp"
82 #endif
83 #ifdef TARGET_OS_ARCH_bsd_zero
84 # include "globals_bsd_zero.hpp"
85 #endif
86 #ifdef COMPILER1
87 #ifdef TARGET_ARCH_x86
88 # include "c1_globals_x86.hpp"
89 #endif
90 #ifdef TARGET_ARCH_sparc
91 # include "c1_globals_sparc.hpp"
92 #endif
93 #ifdef TARGET_ARCH_arm
94 # include "c1_globals_arm.hpp"
95 #endif
96 #ifdef TARGET_ARCH_ppc
97 # include "c1_globals_ppc.hpp"
98 #endif
99 #ifdef TARGET_OS_FAMILY_linux
100 # include "c1_globals_linux.hpp"
101 #endif
102 #ifdef TARGET_OS_FAMILY_solaris
103 # include "c1_globals_solaris.hpp"
104 #endif
105 #ifdef TARGET_OS_FAMILY_windows
106 # include "c1_globals_windows.hpp"
107 #endif
108 #ifdef TARGET_OS_FAMILY_bsd
109 # include "c1_globals_bsd.hpp"
110 #endif
111 #endif
112 #ifdef COMPILER2
113 #ifdef TARGET_ARCH_x86
114 # include "c2_globals_x86.hpp"
115 #endif
116 #ifdef TARGET_ARCH_sparc
117 # include "c2_globals_sparc.hpp"
118 #endif
119 #ifdef TARGET_ARCH_arm
120 # include "c2_globals_arm.hpp"
121 #endif
122 #ifdef TARGET_OS_FAMILY_linux
123 # include "c2_globals_linux.hpp"
124 #endif
125 #ifdef TARGET_OS_FAMILY_solaris
126 # include "c2_globals_solaris.hpp"
127 #endif
128 #ifdef TARGET_OS_FAMILY_windows
129 # include "c2_globals_windows.hpp"
130 #endif
131 #ifdef TARGET_OS_FAMILY_bsd
132 # include "c2_globals_bsd.hpp"
133 #endif
134 #endif
135 #ifdef SHARK
136 #ifdef TARGET_ARCH_zero
137 # include "shark_globals_zero.hpp"
138 #endif
139 #endif
141 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
142 define_pd_global(bool, BackgroundCompilation, false);
143 define_pd_global(bool, UseTLAB, false);
144 define_pd_global(bool, CICompileOSR, false);
145 define_pd_global(bool, UseTypeProfile, false);
146 define_pd_global(bool, UseOnStackReplacement, false);
147 define_pd_global(bool, InlineIntrinsics, false);
148 define_pd_global(bool, PreferInterpreterNativeStubs, true);
149 define_pd_global(bool, ProfileInterpreter, false);
150 define_pd_global(bool, ProfileTraps, false);
151 define_pd_global(bool, TieredCompilation, false);
153 define_pd_global(intx, CompileThreshold, 0);
154 define_pd_global(intx, BackEdgeThreshold, 0);
156 define_pd_global(intx, OnStackReplacePercentage, 0);
157 define_pd_global(bool, ResizeTLAB, false);
158 define_pd_global(intx, FreqInlineSize, 0);
159 define_pd_global(intx, InlineSmallCode, 0);
160 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
161 define_pd_global(intx, InlineClassNatives, true);
162 define_pd_global(intx, InlineUnsafeOps, true);
163 define_pd_global(intx, InitialCodeCacheSize, 160*K);
164 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
165 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
166 define_pd_global(intx, CodeCacheMinBlockLength, 1);
167 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M));
168 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
169 define_pd_global(bool, NeverActAsServerClassMachine, true);
170 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
171 #define CI_COMPILER_COUNT 0
172 #else
174 #ifdef COMPILER2
175 #define CI_COMPILER_COUNT 2
176 #else
177 #define CI_COMPILER_COUNT 1
178 #endif // COMPILER2
180 #endif // no compilers
183 // string type aliases used only in this file
184 typedef const char* ccstr;
185 typedef const char* ccstrlist; // represents string arguments which accumulate
187 enum FlagValueOrigin {
188 DEFAULT = 0,
189 COMMAND_LINE = 1,
190 ENVIRON_VAR = 2,
191 CONFIG_FILE = 3,
192 MANAGEMENT = 4,
193 ERGONOMIC = 5,
194 ATTACH_ON_DEMAND = 6,
195 INTERNAL = 99
196 };
198 struct Flag {
199 const char *type;
200 const char *name;
201 void* addr;
203 NOT_PRODUCT(const char *doc;)
205 const char *kind;
206 FlagValueOrigin origin;
208 // points to all Flags static array
209 static Flag *flags;
211 // number of flags
212 static size_t numFlags;
214 static Flag* find_flag(char* name, size_t length);
216 bool is_bool() const { return strcmp(type, "bool") == 0; }
217 bool get_bool() const { return *((bool*) addr); }
218 void set_bool(bool value) { *((bool*) addr) = value; }
220 bool is_intx() const { return strcmp(type, "intx") == 0; }
221 intx get_intx() const { return *((intx*) addr); }
222 void set_intx(intx value) { *((intx*) addr) = value; }
224 bool is_uintx() const { return strcmp(type, "uintx") == 0; }
225 uintx get_uintx() const { return *((uintx*) addr); }
226 void set_uintx(uintx value) { *((uintx*) addr) = value; }
228 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; }
229 uint64_t get_uint64_t() const { return *((uint64_t*) addr); }
230 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
232 bool is_double() const { return strcmp(type, "double") == 0; }
233 double get_double() const { return *((double*) addr); }
234 void set_double(double value) { *((double*) addr) = value; }
236 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
237 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
238 ccstr get_ccstr() const { return *((ccstr*) addr); }
239 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
241 bool is_unlocker() const;
242 bool is_unlocked() const;
243 bool is_writeable() const;
244 bool is_external() const;
246 void print_on(outputStream* st, bool withComments = false );
247 void print_as_flag(outputStream* st);
248 };
250 // debug flags control various aspects of the VM and are global accessible
252 // use FlagSetting to temporarily change some debug flag
253 // e.g. FlagSetting fs(DebugThisAndThat, true);
254 // restored to previous value upon leaving scope
255 class FlagSetting {
256 bool val;
257 bool* flag;
258 public:
259 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
260 ~FlagSetting() { *flag = val; }
261 };
264 class CounterSetting {
265 intx* counter;
266 public:
267 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
268 ~CounterSetting() { (*counter)--; }
269 };
272 class IntFlagSetting {
273 intx val;
274 intx* flag;
275 public:
276 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
277 ~IntFlagSetting() { *flag = val; }
278 };
281 class DoubleFlagSetting {
282 double val;
283 double* flag;
284 public:
285 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
286 ~DoubleFlagSetting() { *flag = val; }
287 };
290 class CommandLineFlags {
291 public:
292 static bool boolAt(char* name, size_t len, bool* value);
293 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
294 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
295 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); }
297 static bool intxAt(char* name, size_t len, intx* value);
298 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
299 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
300 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); }
302 static bool uintxAt(char* name, size_t len, uintx* value);
303 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
304 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
305 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
307 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
308 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
309 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
310 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
312 static bool doubleAt(char* name, size_t len, double* value);
313 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
314 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
315 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
317 static bool ccstrAt(char* name, size_t len, ccstr* value);
318 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
319 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
320 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
322 // Returns false if name is not a command line flag.
323 static bool wasSetOnCmdline(const char* name, bool* value);
324 static void printSetFlags();
326 static void printFlags(bool withComments = false );
328 static void verify() PRODUCT_RETURN;
329 };
331 // use this for flags that are true by default in the debug version but
332 // false in the optimized version, and vice versa
333 #ifdef ASSERT
334 #define trueInDebug true
335 #define falseInDebug false
336 #else
337 #define trueInDebug false
338 #define falseInDebug true
339 #endif
341 // use this for flags that are true per default in the product build
342 // but false in development builds, and vice versa
343 #ifdef PRODUCT
344 #define trueInProduct true
345 #define falseInProduct false
346 #else
347 #define trueInProduct false
348 #define falseInProduct true
349 #endif
351 // use this for flags that are true per default in the tiered build
352 // but false in non-tiered builds, and vice versa
353 #ifdef TIERED
354 #define trueInTiered true
355 #define falseInTiered false
356 #else
357 #define trueInTiered false
358 #define falseInTiered true
359 #endif
361 #ifdef JAVASE_EMBEDDED
362 #define falseInEmbedded false
363 #else
364 #define falseInEmbedded true
365 #endif
367 // develop flags are settable / visible only during development and are constant in the PRODUCT version
368 // product flags are always settable / visible
369 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
371 // A flag must be declared with one of the following types:
372 // bool, intx, uintx, ccstr.
373 // The type "ccstr" is an alias for "const char*" and is used
374 // only in this file, because the macrology requires single-token type names.
376 // Note: Diagnostic options not meant for VM tuning or for product modes.
377 // They are to be used for VM quality assurance or field diagnosis
378 // of VM bugs. They are hidden so that users will not be encouraged to
379 // try them as if they were VM ordinary execution options. However, they
380 // are available in the product version of the VM. Under instruction
381 // from support engineers, VM customers can turn them on to collect
382 // diagnostic information about VM problems. To use a VM diagnostic
383 // option, you must first specify +UnlockDiagnosticVMOptions.
384 // (This master switch also affects the behavior of -Xprintflags.)
385 //
386 // experimental flags are in support of features that are not
387 // part of the officially supported product, but are available
388 // for experimenting with. They could, for example, be performance
389 // features that may not have undergone full or rigorous QA, but which may
390 // help performance in some cases and released for experimentation
391 // by the community of users and developers. This flag also allows one to
392 // be able to build a fully supported product that nonetheless also
393 // ships with some unsupported, lightly tested, experimental features.
394 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
395 // UnlockExperimentalVMOptions flag, which allows the control and
396 // modification of the experimental flags.
397 //
398 // Nota bene: neither diagnostic nor experimental options should be used casually,
399 // and they are not supported on production loads, except under explicit
400 // direction from support engineers.
401 //
402 // manageable flags are writeable external product flags.
403 // They are dynamically writeable through the JDK management interface
404 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
405 // These flags are external exported interface (see CCC). The list of
406 // manageable flags can be queried programmatically through the management
407 // interface.
408 //
409 // A flag can be made as "manageable" only if
410 // - the flag is defined in a CCC as an external exported interface.
411 // - the VM implementation supports dynamic setting of the flag.
412 // This implies that the VM must *always* query the flag variable
413 // and not reuse state related to the flag state at any given time.
414 // - you want the flag to be queried programmatically by the customers.
415 //
416 // product_rw flags are writeable internal product flags.
417 // They are like "manageable" flags but for internal/private use.
418 // The list of product_rw flags are internal/private flags which
419 // may be changed/removed in a future release. It can be set
420 // through the management interface to get/set value
421 // when the name of flag is supplied.
422 //
423 // A flag can be made as "product_rw" only if
424 // - the VM implementation supports dynamic setting of the flag.
425 // This implies that the VM must *always* query the flag variable
426 // and not reuse state related to the flag state at any given time.
427 //
428 // Note that when there is a need to support develop flags to be writeable,
429 // it can be done in the same way as product_rw.
431 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
432 \
433 lp64_product(bool, UseCompressedOops, false, \
434 "Use 32-bit object references in 64-bit VM. " \
435 "lp64_product means flag is always constant in 32 bit VM") \
436 \
437 notproduct(bool, CheckCompressedOops, true, \
438 "generate checks in encoding/decoding code in debug VM") \
439 \
440 product_pd(uintx, HeapBaseMinAddress, \
441 "OS specific low limit for heap base address") \
442 \
443 diagnostic(bool, PrintCompressedOopsMode, false, \
444 "Print compressed oops base address and encoding mode") \
445 \
446 lp64_product(intx, ObjectAlignmentInBytes, 8, \
447 "Default object alignment in bytes, 8 is minimum") \
448 \
449 /* UseMembar is theoretically a temp flag used for memory barrier \
450 * removal testing. It was supposed to be removed before FCS but has \
451 * been re-added (see 6401008) */ \
452 product_pd(bool, UseMembar, \
453 "(Unstable) Issues membars on thread state transitions") \
454 \
455 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
456 * that don't support it. This will be replaced by processor detection \
457 * logic. \
458 */ \
459 product(bool, UsePPCLWSYNC, true, \
460 "Use lwsync instruction if true, else use slower sync") \
461 \
462 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
463 "Whether to clean the chunk pool asynchronously") \
464 \
465 /* Temporary: See 6948537 */ \
466 experimental(bool, UseMemSetInBOT, true, \
467 "(Unstable) uses memset in BOT updates in GC code") \
468 \
469 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
470 "Enable normal processing of flags relating to field diagnostics")\
471 \
472 experimental(bool, UnlockExperimentalVMOptions, false, \
473 "Enable normal processing of flags relating to experimental features")\
474 \
475 product(bool, JavaMonitorsInStackTrace, true, \
476 "Print info. about Java monitor locks when the stacks are dumped")\
477 \
478 product_pd(bool, UseLargePages, \
479 "Use large page memory") \
480 \
481 product_pd(bool, UseLargePagesIndividualAllocation, \
482 "Allocate large pages individually for better affinity") \
483 \
484 develop(bool, LargePagesIndividualAllocationInjectError, false, \
485 "Fail large pages individual allocation") \
486 \
487 develop(bool, TracePageSizes, false, \
488 "Trace page size selection and usage.") \
489 \
490 product(bool, UseNUMA, false, \
491 "Use NUMA if available") \
492 \
493 product(bool, UseNUMAInterleaving, false, \
494 "Interleave memory across NUMA nodes if available") \
495 \
496 product(uintx, NUMAInterleaveGranularity, 2*M, \
497 "Granularity to use for NUMA interleaving on Windows OS") \
498 \
499 product(bool, ForceNUMA, false, \
500 "Force NUMA optimizations on single-node/UMA systems") \
501 \
502 product(intx, NUMAChunkResizeWeight, 20, \
503 "Percentage (0-100) used to weight the current sample when " \
504 "computing exponentially decaying average for " \
505 "AdaptiveNUMAChunkSizing") \
506 \
507 product(intx, NUMASpaceResizeRate, 1*G, \
508 "Do not reallocate more that this amount per collection") \
509 \
510 product(bool, UseAdaptiveNUMAChunkSizing, true, \
511 "Enable adaptive chunk sizing for NUMA") \
512 \
513 product(bool, NUMAStats, false, \
514 "Print NUMA stats in detailed heap information") \
515 \
516 product(intx, NUMAPageScanRate, 256, \
517 "Maximum number of pages to include in the page scan procedure") \
518 \
519 product_pd(bool, NeedsDeoptSuspend, \
520 "True for register window machines (sparc/ia64)") \
521 \
522 product(intx, UseSSE, 99, \
523 "Highest supported SSE instructions set on x86/x64") \
524 \
525 product(intx, UseVIS, 99, \
526 "Highest supported VIS instructions set on Sparc") \
527 \
528 product(uintx, LargePageSizeInBytes, 0, \
529 "Large page size (0 to let VM choose the page size") \
530 \
531 product(uintx, LargePageHeapSizeThreshold, 128*M, \
532 "Use large pages if max heap is at least this big") \
533 \
534 product(bool, ForceTimeHighResolution, false, \
535 "Using high time resolution(For Win32 only)") \
536 \
537 develop(bool, TraceItables, false, \
538 "Trace initialization and use of itables") \
539 \
540 develop(bool, TracePcPatching, false, \
541 "Trace usage of frame::patch_pc") \
542 \
543 develop(bool, TraceJumps, false, \
544 "Trace assembly jumps in thread ring buffer") \
545 \
546 develop(bool, TraceRelocator, false, \
547 "Trace the bytecode relocator") \
548 \
549 develop(bool, TraceLongCompiles, false, \
550 "Print out every time compilation is longer than " \
551 "a given threashold") \
552 \
553 develop(bool, SafepointALot, false, \
554 "Generates a lot of safepoints. Works with " \
555 "GuaranteedSafepointInterval") \
556 \
557 product_pd(bool, BackgroundCompilation, \
558 "A thread requesting compilation is not blocked during " \
559 "compilation") \
560 \
561 product(bool, PrintVMQWaitTime, false, \
562 "Prints out the waiting time in VM operation queue") \
563 \
564 develop(bool, BailoutToInterpreterForThrows, false, \
565 "Compiled methods which throws/catches exceptions will be " \
566 "deopt and intp.") \
567 \
568 develop(bool, NoYieldsInMicrolock, false, \
569 "Disable yields in microlock") \
570 \
571 develop(bool, TraceOopMapGeneration, false, \
572 "Shows oopmap generation") \
573 \
574 product(bool, MethodFlushing, true, \
575 "Reclamation of zombie and not-entrant methods") \
576 \
577 develop(bool, VerifyStack, false, \
578 "Verify stack of each thread when it is entering a runtime call") \
579 \
580 diagnostic(bool, ForceUnreachable, false, \
581 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
582 \
583 notproduct(bool, StressDerivedPointers, false, \
584 "Force scavenge when a derived pointers is detected on stack " \
585 "after rtm call") \
586 \
587 develop(bool, TraceDerivedPointers, false, \
588 "Trace traversal of derived pointers on stack") \
589 \
590 notproduct(bool, TraceCodeBlobStacks, false, \
591 "Trace stack-walk of codeblobs") \
592 \
593 product(bool, PrintJNIResolving, false, \
594 "Used to implement -v:jni") \
595 \
596 notproduct(bool, PrintRewrites, false, \
597 "Print methods that are being rewritten") \
598 \
599 product(bool, UseInlineCaches, true, \
600 "Use Inline Caches for virtual calls ") \
601 \
602 develop(bool, InlineArrayCopy, true, \
603 "inline arraycopy native that is known to be part of " \
604 "base library DLL") \
605 \
606 develop(bool, InlineObjectHash, true, \
607 "inline Object::hashCode() native that is known to be part " \
608 "of base library DLL") \
609 \
610 develop(bool, InlineObjectCopy, true, \
611 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \
612 \
613 develop(bool, InlineNatives, true, \
614 "inline natives that are known to be part of base library DLL") \
615 \
616 develop(bool, InlineMathNatives, true, \
617 "inline SinD, CosD, etc.") \
618 \
619 develop(bool, InlineClassNatives, true, \
620 "inline Class.isInstance, etc") \
621 \
622 develop(bool, InlineAtomicLong, true, \
623 "inline sun.misc.AtomicLong") \
624 \
625 develop(bool, InlineThreadNatives, true, \
626 "inline Thread.currentThread, etc") \
627 \
628 develop(bool, InlineReflectionGetCallerClass, true, \
629 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
630 "of base library DLL") \
631 \
632 develop(bool, InlineUnsafeOps, true, \
633 "inline memory ops (native methods) from sun.misc.Unsafe") \
634 \
635 develop(bool, ConvertCmpD2CmpF, true, \
636 "Convert cmpD to cmpF when one input is constant in float range") \
637 \
638 develop(bool, ConvertFloat2IntClipping, true, \
639 "Convert float2int clipping idiom to integer clipping") \
640 \
641 develop(bool, SpecialStringCompareTo, true, \
642 "special version of string compareTo") \
643 \
644 develop(bool, SpecialStringIndexOf, true, \
645 "special version of string indexOf") \
646 \
647 develop(bool, SpecialStringEquals, true, \
648 "special version of string equals") \
649 \
650 develop(bool, SpecialArraysEquals, true, \
651 "special version of Arrays.equals(char[],char[])") \
652 \
653 product(bool, UseSSE42Intrinsics, false, \
654 "SSE4.2 versions of intrinsics") \
655 \
656 product(bool, UseCondCardMark, false, \
657 "Check for already marked card before updating card table") \
658 \
659 develop(bool, TraceCallFixup, false, \
660 "traces all call fixups") \
661 \
662 develop(bool, DeoptimizeALot, false, \
663 "deoptimize at every exit from the runtime system") \
664 \
665 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
666 "a comma separated list of bcis to deoptimize at") \
667 \
668 product(bool, DeoptimizeRandom, false, \
669 "deoptimize random frames on random exit from the runtime system")\
670 \
671 notproduct(bool, ZombieALot, false, \
672 "creates zombies (non-entrant) at exit from the runt. system") \
673 \
674 product(bool, UnlinkSymbolsALot, false, \
675 "unlink unreferenced symbols from the symbol table at safepoints")\
676 \
677 notproduct(bool, WalkStackALot, false, \
678 "trace stack (no print) at every exit from the runtime system") \
679 \
680 product(bool, Debugging, false, \
681 "set when executing debug methods in debug.ccp " \
682 "(to prevent triggering assertions)") \
683 \
684 notproduct(bool, StrictSafepointChecks, trueInDebug, \
685 "Enable strict checks that safepoints cannot happen for threads " \
686 "that used No_Safepoint_Verifier") \
687 \
688 notproduct(bool, VerifyLastFrame, false, \
689 "Verify oops on last frame on entry to VM") \
690 \
691 develop(bool, TraceHandleAllocation, false, \
692 "Prints out warnings when suspicious many handles are allocated") \
693 \
694 product(bool, UseCompilerSafepoints, true, \
695 "Stop at safepoints in compiled code") \
696 \
697 product(bool, UseSplitVerifier, true, \
698 "use split verifier with StackMapTable attributes") \
699 \
700 product(bool, FailOverToOldVerifier, true, \
701 "fail over to old verifier when split verifier fails") \
702 \
703 develop(bool, ShowSafepointMsgs, false, \
704 "Show msg. about safepoint synch.") \
705 \
706 product(bool, SafepointTimeout, false, \
707 "Time out and warn or fail after SafepointTimeoutDelay " \
708 "milliseconds if failed to reach safepoint") \
709 \
710 develop(bool, DieOnSafepointTimeout, false, \
711 "Die upon failure to reach safepoint (see SafepointTimeout)") \
712 \
713 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
714 /* typically, at most a few retries are needed */ \
715 product(intx, SuspendRetryCount, 50, \
716 "Maximum retry count for an external suspend request") \
717 \
718 product(intx, SuspendRetryDelay, 5, \
719 "Milliseconds to delay per retry (* current_retry_count)") \
720 \
721 product(bool, AssertOnSuspendWaitFailure, false, \
722 "Assert/Guarantee on external suspend wait failure") \
723 \
724 product(bool, TraceSuspendWaitFailures, false, \
725 "Trace external suspend wait failures") \
726 \
727 product(bool, MaxFDLimit, true, \
728 "Bump the number of file descriptors to max in solaris.") \
729 \
730 notproduct(bool, LogEvents, trueInDebug, \
731 "Enable Event log") \
732 \
733 product(bool, BytecodeVerificationRemote, true, \
734 "Enables the Java bytecode verifier for remote classes") \
735 \
736 product(bool, BytecodeVerificationLocal, false, \
737 "Enables the Java bytecode verifier for local classes") \
738 \
739 develop(bool, ForceFloatExceptions, trueInDebug, \
740 "Force exceptions on FP stack under/overflow") \
741 \
742 develop(bool, SoftMatchFailure, trueInProduct, \
743 "If the DFA fails to match a node, print a message and bail out") \
744 \
745 develop(bool, VerifyStackAtCalls, false, \
746 "Verify that the stack pointer is unchanged after calls") \
747 \
748 develop(bool, TraceJavaAssertions, false, \
749 "Trace java language assertions") \
750 \
751 notproduct(bool, CheckAssertionStatusDirectives, false, \
752 "temporary - see javaClasses.cpp") \
753 \
754 notproduct(bool, PrintMallocFree, false, \
755 "Trace calls to C heap malloc/free allocation") \
756 \
757 product(bool, PrintOopAddress, false, \
758 "Always print the location of the oop") \
759 \
760 notproduct(bool, VerifyCodeCacheOften, false, \
761 "Verify compiled-code cache often") \
762 \
763 develop(bool, ZapDeadCompiledLocals, false, \
764 "Zap dead locals in compiler frames") \
765 \
766 notproduct(bool, ZapDeadLocalsOld, false, \
767 "Zap dead locals (old version, zaps all frames when " \
768 "entering the VM") \
769 \
770 notproduct(bool, CheckOopishValues, false, \
771 "Warn if value contains oop ( requires ZapDeadLocals)") \
772 \
773 develop(bool, UseMallocOnly, false, \
774 "use only malloc/free for allocation (no resource area/arena)") \
775 \
776 develop(bool, PrintMalloc, false, \
777 "print all malloc/free calls") \
778 \
779 develop(bool, PrintMallocStatistics, false, \
780 "print malloc/free statistics") \
781 \
782 develop(bool, ZapResourceArea, trueInDebug, \
783 "Zap freed resource/arena space with 0xABABABAB") \
784 \
785 notproduct(bool, ZapVMHandleArea, trueInDebug, \
786 "Zap freed VM handle space with 0xBCBCBCBC") \
787 \
788 develop(bool, ZapJNIHandleArea, trueInDebug, \
789 "Zap freed JNI handle space with 0xFEFEFEFE") \
790 \
791 notproduct(bool, ZapStackSegments, trueInDebug, \
792 "Zap allocated/freed Stack segments with 0xFADFADED") \
793 \
794 develop(bool, ZapUnusedHeapArea, trueInDebug, \
795 "Zap unused heap space with 0xBAADBABE") \
796 \
797 develop(bool, TraceZapUnusedHeapArea, false, \
798 "Trace zapping of unused heap space") \
799 \
800 develop(bool, CheckZapUnusedHeapArea, false, \
801 "Check zapping of unused heap space") \
802 \
803 develop(bool, ZapFillerObjects, trueInDebug, \
804 "Zap filler objects with 0xDEAFBABE") \
805 \
806 develop(bool, PrintVMMessages, true, \
807 "Print vm messages on console") \
808 \
809 product(bool, PrintGCApplicationConcurrentTime, false, \
810 "Print the time the application has been running") \
811 \
812 product(bool, PrintGCApplicationStoppedTime, false, \
813 "Print the time the application has been stopped") \
814 \
815 notproduct(uintx, ErrorHandlerTest, 0, \
816 "If > 0, provokes an error after VM initialization; the value" \
817 "determines which error to provoke. See test_error_handler()" \
818 "in debug.cpp.") \
819 \
820 develop(bool, Verbose, false, \
821 "Prints additional debugging information from other modes") \
822 \
823 develop(bool, PrintMiscellaneous, false, \
824 "Prints uncategorized debugging information (requires +Verbose)") \
825 \
826 develop(bool, WizardMode, false, \
827 "Prints much more debugging information") \
828 \
829 product(bool, ShowMessageBoxOnError, false, \
830 "Keep process alive on VM fatal error") \
831 \
832 product(bool, CreateMinidumpOnCrash, false, \
833 "Create minidump on VM fatal error") \
834 \
835 product_pd(bool, UseOSErrorReporting, \
836 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
837 \
838 product(bool, SuppressFatalErrorMessage, false, \
839 "Do NO Fatal Error report [Avoid deadlock]") \
840 \
841 product(ccstrlist, OnError, "", \
842 "Run user-defined commands on fatal error; see VMError.cpp " \
843 "for examples") \
844 \
845 product(ccstrlist, OnOutOfMemoryError, "", \
846 "Run user-defined commands on first java.lang.OutOfMemoryError") \
847 \
848 manageable(bool, HeapDumpBeforeFullGC, false, \
849 "Dump heap to file before any major stop-world GC") \
850 \
851 manageable(bool, HeapDumpAfterFullGC, false, \
852 "Dump heap to file after any major stop-world GC") \
853 \
854 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
855 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
856 \
857 manageable(ccstr, HeapDumpPath, NULL, \
858 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
859 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
860 "in the working directory)") \
861 \
862 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
863 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
864 "when the heap usage is larger than this") \
865 \
866 develop(uintx, HeapDumpSegmentSize, 1*G, \
867 "Approximate segment size when generating a segmented heap dump") \
868 \
869 develop(bool, BreakAtWarning, false, \
870 "Execute breakpoint upon encountering VM warning") \
871 \
872 product_pd(bool, UseVectoredExceptions, \
873 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
874 \
875 develop(bool, TraceVMOperation, false, \
876 "Trace vm operations") \
877 \
878 develop(bool, UseFakeTimers, false, \
879 "Tells whether the VM should use system time or a fake timer") \
880 \
881 diagnostic(bool, LogCompilation, false, \
882 "Log compilation activity in detail to hotspot.log or LogFile") \
883 \
884 product(bool, PrintCompilation, false, \
885 "Print compilations") \
886 \
887 diagnostic(bool, TraceNMethodInstalls, false, \
888 "Trace nmethod intallation") \
889 \
890 diagnostic(intx, ScavengeRootsInCode, 1, \
891 "0: do not allow scavengable oops in the code cache; " \
892 "1: allow scavenging from the code cache; " \
893 "2: emit as many constants as the compiler can see") \
894 \
895 diagnostic(bool, TraceOSRBreakpoint, false, \
896 "Trace OSR Breakpoint ") \
897 \
898 diagnostic(bool, TraceCompileTriggered, false, \
899 "Trace compile triggered") \
900 \
901 diagnostic(bool, TraceTriggers, false, \
902 "Trace triggers") \
903 \
904 product(bool, AlwaysRestoreFPU, false, \
905 "Restore the FPU control word after every JNI call (expensive)") \
906 \
907 diagnostic(bool, PrintCompilation2, false, \
908 "Print additional statistics per compilation") \
909 \
910 diagnostic(bool, PrintAdapterHandlers, false, \
911 "Print code generated for i2c/c2i adapters") \
912 \
913 develop(bool, VerifyAdapterSharing, false, \
914 "Verify that the code for shared adapters is the equivalent") \
915 \
916 diagnostic(bool, PrintAssembly, false, \
917 "Print assembly code (using external disassembler.so)") \
918 \
919 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
920 "Options string passed to disassembler.so") \
921 \
922 diagnostic(bool, PrintNMethods, false, \
923 "Print assembly code for nmethods when generated") \
924 \
925 diagnostic(bool, PrintNativeNMethods, false, \
926 "Print assembly code for native nmethods when generated") \
927 \
928 develop(bool, PrintDebugInfo, false, \
929 "Print debug information for all nmethods when generated") \
930 \
931 develop(bool, PrintRelocations, false, \
932 "Print relocation information for all nmethods when generated") \
933 \
934 develop(bool, PrintDependencies, false, \
935 "Print dependency information for all nmethods when generated") \
936 \
937 develop(bool, PrintExceptionHandlers, false, \
938 "Print exception handler tables for all nmethods when generated") \
939 \
940 develop(bool, InterceptOSException, false, \
941 "Starts debugger when an implicit OS (e.g., NULL) " \
942 "exception happens") \
943 \
944 notproduct(bool, PrintCodeCache, false, \
945 "Print the compiled_code cache when exiting") \
946 \
947 develop(bool, PrintCodeCache2, false, \
948 "Print detailed info on the compiled_code cache when exiting") \
949 \
950 diagnostic(bool, PrintStubCode, false, \
951 "Print generated stub code") \
952 \
953 product(bool, StackTraceInThrowable, true, \
954 "Collect backtrace in throwable when exception happens") \
955 \
956 product(bool, OmitStackTraceInFastThrow, true, \
957 "Omit backtraces for some 'hot' exceptions in optimized code") \
958 \
959 product(bool, ProfilerPrintByteCodeStatistics, false, \
960 "Prints byte code statictics when dumping profiler output") \
961 \
962 product(bool, ProfilerRecordPC, false, \
963 "Collects tick for each 16 byte interval of compiled code") \
964 \
965 product(bool, ProfileVM, false, \
966 "Profiles ticks that fall within VM (either in the VM Thread " \
967 "or VM code called through stubs)") \
968 \
969 product(bool, ProfileIntervals, false, \
970 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
971 \
972 notproduct(bool, ProfilerCheckIntervals, false, \
973 "Collect and print info on spacing of profiler ticks") \
974 \
975 develop(bool, PrintJVMWarnings, false, \
976 "Prints warnings for unimplemented JVM functions") \
977 \
978 product(bool, PrintWarnings, true, \
979 "Prints JVM warnings to output stream") \
980 \
981 notproduct(uintx, WarnOnStalledSpinLock, 0, \
982 "Prints warnings for stalled SpinLocks") \
983 \
984 develop(bool, InitializeJavaLangSystem, true, \
985 "Initialize java.lang.System - turn off for individual " \
986 "method debugging") \
987 \
988 develop(bool, InitializeJavaLangString, true, \
989 "Initialize java.lang.String - turn off for individual " \
990 "method debugging") \
991 \
992 develop(bool, InitializeJavaLangExceptionsErrors, true, \
993 "Initialize various error and exception classes - turn off for " \
994 "individual method debugging") \
995 \
996 product(bool, RegisterFinalizersAtInit, true, \
997 "Register finalizable objects at end of Object.<init> or " \
998 "after allocation") \
999 \
1000 develop(bool, RegisterReferences, true, \
1001 "Tells whether the VM should register soft/weak/final/phantom " \
1002 "references") \
1003 \
1004 develop(bool, IgnoreRewrites, false, \
1005 "Supress rewrites of bytecodes in the oopmap generator. " \
1006 "This is unsafe!") \
1007 \
1008 develop(bool, PrintCodeCacheExtension, false, \
1009 "Print extension of code cache") \
1010 \
1011 develop(bool, UsePrivilegedStack, true, \
1012 "Enable the security JVM functions") \
1013 \
1014 develop(bool, IEEEPrecision, true, \
1015 "Enables IEEE precision (for INTEL only)") \
1016 \
1017 develop(bool, ProtectionDomainVerification, true, \
1018 "Verifies protection domain before resolution in system " \
1019 "dictionary") \
1020 \
1021 product(bool, ClassUnloading, true, \
1022 "Do unloading of classes") \
1023 \
1024 diagnostic(bool, LinkWellKnownClasses, false, \
1025 "Resolve a well known class as soon as its name is seen") \
1026 \
1027 develop(bool, DisableStartThread, false, \
1028 "Disable starting of additional Java threads " \
1029 "(for debugging only)") \
1030 \
1031 develop(bool, MemProfiling, false, \
1032 "Write memory usage profiling to log file") \
1033 \
1034 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1035 "Prints the system dictionary at exit") \
1036 \
1037 diagnostic(bool, UnsyncloadClass, false, \
1038 "Unstable: VM calls loadClass unsynchronized. Custom " \
1039 "class loader must call VM synchronized for findClass " \
1040 "and defineClass.") \
1041 \
1042 product(bool, AlwaysLockClassLoader, false, \
1043 "Require the VM to acquire the class loader lock before calling " \
1044 "loadClass() even for class loaders registering " \
1045 "as parallel capable") \
1046 \
1047 product(bool, AllowParallelDefineClass, false, \
1048 "Allow parallel defineClass requests for class loaders " \
1049 "registering as parallel capable") \
1050 \
1051 product(bool, MustCallLoadClassInternal, false, \
1052 "Call loadClassInternal() rather than loadClass()") \
1053 \
1054 product_pd(bool, DontYieldALot, \
1055 "Throw away obvious excess yield calls (for SOLARIS only)") \
1056 \
1057 product_pd(bool, ConvertSleepToYield, \
1058 "Converts sleep(0) to thread yield " \
1059 "(may be off for SOLARIS to improve GUI)") \
1060 \
1061 product(bool, ConvertYieldToSleep, false, \
1062 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1063 "behavior (SOLARIS only)") \
1064 \
1065 product(bool, UseBoundThreads, true, \
1066 "Bind user level threads to kernel threads (for SOLARIS only)") \
1067 \
1068 develop(bool, UseDetachedThreads, true, \
1069 "Use detached threads that are recycled upon termination " \
1070 "(for SOLARIS only)") \
1071 \
1072 product(bool, UseLWPSynchronization, true, \
1073 "Use LWP-based instead of libthread-based synchronization " \
1074 "(SPARC only)") \
1075 \
1076 product(ccstr, SyncKnobs, NULL, \
1077 "(Unstable) Various monitor synchronization tunables") \
1078 \
1079 product(intx, EmitSync, 0, \
1080 "(Unsafe,Unstable) " \
1081 " Controls emission of inline sync fast-path code") \
1082 \
1083 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \
1084 \
1085 product(intx, MonitorBound, 0, "Bound Monitor population") \
1086 \
1087 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1088 \
1089 product(intx, Atomics, 0, \
1090 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \
1091 \
1092 product(intx, FenceInstruction, 0, \
1093 "(Unsafe,Unstable) Experimental") \
1094 \
1095 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1096 \
1097 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1098 \
1099 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1100 \
1101 product(intx, hashCode, 0, \
1102 "(Unstable) select hashCode generation algorithm" ) \
1103 \
1104 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1105 "(Unstable, Linux-specific)" \
1106 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1107 \
1108 product(bool, FilterSpuriousWakeups, true, \
1109 "Prevent spurious or premature wakeups from object.wait " \
1110 "(Solaris only)") \
1111 \
1112 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1113 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1114 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1115 \
1116 develop(bool, UsePthreads, false, \
1117 "Use pthread-based instead of libthread-based synchronization " \
1118 "(SPARC only)") \
1119 \
1120 product(bool, AdjustConcurrency, false, \
1121 "call thr_setconcurrency at thread create time to avoid " \
1122 "LWP starvation on MP systems (For Solaris Only)") \
1123 \
1124 develop(bool, UpdateHotSpotCompilerFileOnError, true, \
1125 "Should the system attempt to update the compiler file when " \
1126 "an error occurs?") \
1127 \
1128 product(bool, ReduceSignalUsage, false, \
1129 "Reduce the use of OS signals in Java and/or the VM") \
1130 \
1131 notproduct(bool, ValidateMarkSweep, false, \
1132 "Do extra validation during MarkSweep collection") \
1133 \
1134 notproduct(bool, RecordMarkSweepCompaction, false, \
1135 "Enable GC-to-GC recording and querying of compaction during " \
1136 "MarkSweep") \
1137 \
1138 develop_pd(bool, ShareVtableStubs, \
1139 "Share vtable stubs (smaller code but worse branch prediction") \
1140 \
1141 develop(bool, LoadLineNumberTables, true, \
1142 "Tells whether the class file parser loads line number tables") \
1143 \
1144 develop(bool, LoadLocalVariableTables, true, \
1145 "Tells whether the class file parser loads local variable tables")\
1146 \
1147 develop(bool, LoadLocalVariableTypeTables, true, \
1148 "Tells whether the class file parser loads local variable type tables")\
1149 \
1150 product(bool, AllowUserSignalHandlers, false, \
1151 "Do not complain if the application installs signal handlers " \
1152 "(Solaris & Linux only)") \
1153 \
1154 product(bool, UseSignalChaining, true, \
1155 "Use signal-chaining to invoke signal handlers installed " \
1156 "by the application (Solaris & Linux only)") \
1157 \
1158 product(bool, UseAltSigs, false, \
1159 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1160 "internal signals (Solaris only)") \
1161 \
1162 product(bool, UseSpinning, false, \
1163 "Use spinning in monitor inflation and before entry") \
1164 \
1165 product(bool, PreSpinYield, false, \
1166 "Yield before inner spinning loop") \
1167 \
1168 product(bool, PostSpinYield, true, \
1169 "Yield after inner spinning loop") \
1170 \
1171 product(bool, AllowJNIEnvProxy, false, \
1172 "Allow JNIEnv proxies for jdbx") \
1173 \
1174 product(bool, JNIDetachReleasesMonitors, true, \
1175 "JNI DetachCurrentThread releases monitors owned by thread") \
1176 \
1177 product(bool, RestoreMXCSROnJNICalls, false, \
1178 "Restore MXCSR when returning from JNI calls") \
1179 \
1180 product(bool, CheckJNICalls, false, \
1181 "Verify all arguments to JNI calls") \
1182 \
1183 product(bool, UseFastJNIAccessors, true, \
1184 "Use optimized versions of Get<Primitive>Field") \
1185 \
1186 product(bool, EagerXrunInit, false, \
1187 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1188 " but not all -Xrun libraries may support the state of the VM at this time") \
1189 \
1190 product(bool, PreserveAllAnnotations, false, \
1191 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1192 \
1193 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1194 "Number of OutOfMemoryErrors preallocated with backtrace") \
1195 \
1196 product(bool, LazyBootClassLoader, true, \
1197 "Enable/disable lazy opening of boot class path entries") \
1198 \
1199 diagnostic(bool, UseIncDec, true, \
1200 "Use INC, DEC instructions on x86") \
1201 \
1202 product(bool, UseNewLongLShift, false, \
1203 "Use optimized bitwise shift left") \
1204 \
1205 product(bool, UseStoreImmI16, true, \
1206 "Use store immediate 16-bits value instruction on x86") \
1207 \
1208 product(bool, UseAddressNop, false, \
1209 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \
1210 \
1211 product(bool, UseXmmLoadAndClearUpper, true, \
1212 "Load low part of XMM register and clear upper part") \
1213 \
1214 product(bool, UseXmmRegToRegMoveAll, false, \
1215 "Copy all XMM register bits when moving value between registers") \
1216 \
1217 product(bool, UseXmmI2D, false, \
1218 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
1219 \
1220 product(bool, UseXmmI2F, false, \
1221 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
1222 \
1223 product(bool, UseXMMForArrayCopy, false, \
1224 "Use SSE2 MOVQ instruction for Arraycopy") \
1225 \
1226 product(bool, UseUnalignedLoadStores, false, \
1227 "Use SSE2 MOVDQU instruction for Arraycopy") \
1228 \
1229 product(bool, UseCBCond, false, \
1230 "Use compare and branch instruction on SPARC") \
1231 \
1232 product(intx, FieldsAllocationStyle, 1, \
1233 "0 - type based with oops first, 1 - with oops last, " \
1234 "2 - oops in super and sub classes are together") \
1235 \
1236 product(bool, CompactFields, true, \
1237 "Allocate nonstatic fields in gaps between previous fields") \
1238 \
1239 notproduct(bool, PrintCompactFieldsSavings, false, \
1240 "Print how many words were saved with CompactFields") \
1241 \
1242 product(bool, UseBiasedLocking, true, \
1243 "Enable biased locking in JVM") \
1244 \
1245 product(intx, BiasedLockingStartupDelay, 4000, \
1246 "Number of milliseconds to wait before enabling biased locking") \
1247 \
1248 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1249 "Print statistics of biased locking in JVM") \
1250 \
1251 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1252 "Threshold of number of revocations per type to try to " \
1253 "rebias all objects in the heap of that type") \
1254 \
1255 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1256 "Threshold of number of revocations per type to permanently " \
1257 "revoke biases of all objects in the heap of that type") \
1258 \
1259 product(intx, BiasedLockingDecayTime, 25000, \
1260 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1261 "type after previous bulk rebias") \
1262 \
1263 develop(bool, JavaObjectsInPerm, false, \
1264 "controls whether Classes and interned Strings are allocated" \
1265 "in perm. This purely intended to allow debugging issues" \
1266 "in production.") \
1267 \
1268 /* tracing */ \
1269 \
1270 notproduct(bool, TraceRuntimeCalls, false, \
1271 "Trace run-time calls") \
1272 \
1273 develop(bool, TraceJNICalls, false, \
1274 "Trace JNI calls") \
1275 \
1276 notproduct(bool, TraceJVMCalls, false, \
1277 "Trace JVM calls") \
1278 \
1279 product(ccstr, TraceJVMTI, NULL, \
1280 "Trace flags for JVMTI functions and events") \
1281 \
1282 /* This option can change an EMCP method into an obsolete method. */ \
1283 /* This can affect tests that except specific methods to be EMCP. */ \
1284 /* This option should be used with caution. */ \
1285 product(bool, StressLdcRewrite, false, \
1286 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1287 \
1288 product(intx, TraceRedefineClasses, 0, \
1289 "Trace level for JVMTI RedefineClasses") \
1290 \
1291 develop(bool, StressMethodComparator, false, \
1292 "run the MethodComparator on all loaded methods") \
1293 \
1294 /* change to false by default sometime after Mustang */ \
1295 product(bool, VerifyMergedCPBytecodes, true, \
1296 "Verify bytecodes after RedefineClasses constant pool merging") \
1297 \
1298 develop(bool, TraceJNIHandleAllocation, false, \
1299 "Trace allocation/deallocation of JNI handle blocks") \
1300 \
1301 develop(bool, TraceThreadEvents, false, \
1302 "Trace all thread events") \
1303 \
1304 develop(bool, TraceBytecodes, false, \
1305 "Trace bytecode execution") \
1306 \
1307 develop(bool, TraceClassInitialization, false, \
1308 "Trace class initialization") \
1309 \
1310 develop(bool, TraceExceptions, false, \
1311 "Trace exceptions") \
1312 \
1313 develop(bool, TraceICs, false, \
1314 "Trace inline cache changes") \
1315 \
1316 notproduct(bool, TraceInvocationCounterOverflow, false, \
1317 "Trace method invocation counter overflow") \
1318 \
1319 develop(bool, TraceInlineCacheClearing, false, \
1320 "Trace clearing of inline caches in nmethods") \
1321 \
1322 develop(bool, TraceDependencies, false, \
1323 "Trace dependencies") \
1324 \
1325 develop(bool, VerifyDependencies, trueInDebug, \
1326 "Exercise and verify the compilation dependency mechanism") \
1327 \
1328 develop(bool, TraceNewOopMapGeneration, false, \
1329 "Trace OopMapGeneration") \
1330 \
1331 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1332 "Trace OopMapGeneration: print detailed cell states") \
1333 \
1334 develop(bool, TimeOopMap, false, \
1335 "Time calls to GenerateOopMap::compute_map() in sum") \
1336 \
1337 develop(bool, TimeOopMap2, false, \
1338 "Time calls to GenerateOopMap::compute_map() individually") \
1339 \
1340 develop(bool, TraceMonitorMismatch, false, \
1341 "Trace monitor matching failures during OopMapGeneration") \
1342 \
1343 develop(bool, TraceOopMapRewrites, false, \
1344 "Trace rewritting of method oops during oop map generation") \
1345 \
1346 develop(bool, TraceSafepoint, false, \
1347 "Trace safepoint operations") \
1348 \
1349 develop(bool, TraceICBuffer, false, \
1350 "Trace usage of IC buffer") \
1351 \
1352 develop(bool, TraceCompiledIC, false, \
1353 "Trace changes of compiled IC") \
1354 \
1355 notproduct(bool, TraceZapDeadLocals, false, \
1356 "Trace zapping dead locals") \
1357 \
1358 develop(bool, TraceStartupTime, false, \
1359 "Trace setup time") \
1360 \
1361 product(ccstr, HPILibPath, NULL, \
1362 "Specify alternate path to HPI library") \
1363 \
1364 develop(bool, TraceProtectionDomainVerification, false, \
1365 "Trace protection domain verifcation") \
1366 \
1367 develop(bool, TraceClearedExceptions, false, \
1368 "Prints when an exception is forcibly cleared") \
1369 \
1370 product(bool, TraceClassResolution, false, \
1371 "Trace all constant pool resolutions (for debugging)") \
1372 \
1373 product(bool, TraceBiasedLocking, false, \
1374 "Trace biased locking in JVM") \
1375 \
1376 product(bool, TraceMonitorInflation, false, \
1377 "Trace monitor inflation in JVM") \
1378 \
1379 /* assembler */ \
1380 product(bool, Use486InstrsOnly, false, \
1381 "Use 80486 Compliant instruction subset") \
1382 \
1383 /* gc */ \
1384 \
1385 product(bool, UseSerialGC, false, \
1386 "Use the serial garbage collector") \
1387 \
1388 product(bool, UseG1GC, false, \
1389 "Use the Garbage-First garbage collector") \
1390 \
1391 product(bool, UseParallelGC, false, \
1392 "Use the Parallel Scavenge garbage collector") \
1393 \
1394 product(bool, UseParallelOldGC, false, \
1395 "Use the Parallel Old garbage collector") \
1396 \
1397 product(uintx, HeapMaximumCompactionInterval, 20, \
1398 "How often should we maximally compact the heap (not allowing " \
1399 "any dead space)") \
1400 \
1401 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1402 "The collection count for the first maximum compaction") \
1403 \
1404 product(bool, UseMaximumCompactionOnSystemGC, true, \
1405 "In the Parallel Old garbage collector maximum compaction for " \
1406 "a system GC") \
1407 \
1408 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1409 "The mean used by the par compact dead wood" \
1410 "limiter (a number between 0-100).") \
1411 \
1412 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1413 "The standard deviation used by the par compact dead wood" \
1414 "limiter (a number between 0-100).") \
1415 \
1416 product(uintx, ParallelGCThreads, 0, \
1417 "Number of parallel threads parallel gc will use") \
1418 \
1419 product(bool, UseDynamicNumberOfGCThreads, false, \
1420 "Dynamically choose the number of parallel threads " \
1421 "parallel gc will use") \
1422 \
1423 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1424 "Force dynamic selection of the number of" \
1425 "parallel threads parallel gc will use to aid debugging") \
1426 \
1427 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1428 "Size of heap (bytes) per GC thread used in calculating the " \
1429 "number of GC threads") \
1430 \
1431 product(bool, TraceDynamicGCThreads, false, \
1432 "Trace the dynamic GC thread usage") \
1433 \
1434 develop(bool, ParallelOldGCSplitALot, false, \
1435 "Provoke splitting (copying data from a young gen space to" \
1436 "multiple destination spaces)") \
1437 \
1438 develop(uintx, ParallelOldGCSplitInterval, 3, \
1439 "How often to provoke splitting a young gen space") \
1440 \
1441 develop(bool, TraceRegionTasksQueuing, false, \
1442 "Trace the queuing of the region tasks") \
1443 \
1444 product(uintx, ConcGCThreads, 0, \
1445 "Number of threads concurrent gc will use") \
1446 \
1447 product(uintx, YoungPLABSize, 4096, \
1448 "Size of young gen promotion labs (in HeapWords)") \
1449 \
1450 product(uintx, OldPLABSize, 1024, \
1451 "Size of old gen promotion labs (in HeapWords)") \
1452 \
1453 product(uintx, GCTaskTimeStampEntries, 200, \
1454 "Number of time stamp entries per gc worker thread") \
1455 \
1456 product(bool, AlwaysTenure, false, \
1457 "Always tenure objects in eden. (ParallelGC only)") \
1458 \
1459 product(bool, NeverTenure, false, \
1460 "Never tenure objects in eden, May tenure on overflow " \
1461 "(ParallelGC only)") \
1462 \
1463 product(bool, ScavengeBeforeFullGC, true, \
1464 "Scavenge youngest generation before each full GC, " \
1465 "used with UseParallelGC") \
1466 \
1467 develop(bool, ScavengeWithObjectsInToSpace, false, \
1468 "Allow scavenges to occur when to_space contains objects.") \
1469 \
1470 product(bool, UseConcMarkSweepGC, false, \
1471 "Use Concurrent Mark-Sweep GC in the old generation") \
1472 \
1473 product(bool, ExplicitGCInvokesConcurrent, false, \
1474 "A System.gc() request invokes a concurrent collection;" \
1475 " (effective only when UseConcMarkSweepGC)") \
1476 \
1477 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1478 "A System.gc() request invokes a concurrent collection and " \
1479 "also unloads classes during such a concurrent gc cycle " \
1480 "(effective only when UseConcMarkSweepGC)") \
1481 \
1482 product(bool, GCLockerInvokesConcurrent, false, \
1483 "The exit of a JNI CS necessitating a scavenge also" \
1484 " kicks off a bkgrd concurrent collection") \
1485 \
1486 product(uintx, GCLockerEdenExpansionPercent, 5, \
1487 "How much the GC can expand the eden by while the GC locker " \
1488 "is active (as a percentage)") \
1489 \
1490 develop(bool, UseCMSAdaptiveFreeLists, true, \
1491 "Use Adaptive Free Lists in the CMS generation") \
1492 \
1493 develop(bool, UseAsyncConcMarkSweepGC, true, \
1494 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1495 \
1496 develop(bool, RotateCMSCollectionTypes, false, \
1497 "Rotate the CMS collections among concurrent and STW") \
1498 \
1499 product(bool, UseCMSBestFit, true, \
1500 "Use CMS best fit allocation strategy") \
1501 \
1502 product(bool, UseCMSCollectionPassing, true, \
1503 "Use passing of collection from background to foreground") \
1504 \
1505 product(bool, UseParNewGC, false, \
1506 "Use parallel threads in the new generation.") \
1507 \
1508 product(bool, ParallelGCVerbose, false, \
1509 "Verbose output for parallel GC.") \
1510 \
1511 product(intx, ParallelGCBufferWastePct, 10, \
1512 "wasted fraction of parallel allocation buffer.") \
1513 \
1514 diagnostic(bool, ParallelGCRetainPLAB, false, \
1515 "Retain parallel allocation buffers across scavenges; " \
1516 " -- disabled because this currently conflicts with " \
1517 " parallel card scanning under certain conditions ") \
1518 \
1519 product(intx, TargetPLABWastePct, 10, \
1520 "target wasted space in last buffer as pct of overall allocation")\
1521 \
1522 product(uintx, PLABWeight, 75, \
1523 "Percentage (0-100) used to weight the current sample when" \
1524 "computing exponentially decaying average for ResizePLAB.") \
1525 \
1526 product(bool, ResizePLAB, true, \
1527 "Dynamically resize (survivor space) promotion labs") \
1528 \
1529 product(bool, PrintPLAB, false, \
1530 "Print (survivor space) promotion labs sizing decisions") \
1531 \
1532 product(intx, ParGCArrayScanChunk, 50, \
1533 "Scan a subset and push remainder, if array is bigger than this") \
1534 \
1535 product(bool, ParGCUseLocalOverflow, false, \
1536 "Instead of a global overflow list, use local overflow stacks") \
1537 \
1538 product(bool, ParGCTrimOverflow, true, \
1539 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1540 \
1541 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1542 "Whether we should simulate work queue overflow in ParNew") \
1543 \
1544 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1545 "An `interval' counter that determines how frequently " \
1546 "we simulate overflow; a smaller number increases frequency") \
1547 \
1548 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1549 "The desired number of objects to claim from the overflow list") \
1550 \
1551 diagnostic(intx, ParGCStridesPerThread, 2, \
1552 "The number of strides per worker thread that we divide up the " \
1553 "card table scanning work into") \
1554 \
1555 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1556 "The number of cards in each chunk of the parallel chunks used " \
1557 "during card table scanning") \
1558 \
1559 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1560 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1561 "parallel GC.") \
1562 \
1563 product(uintx, OldPLABWeight, 50, \
1564 "Percentage (0-100) used to weight the current sample when" \
1565 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1566 \
1567 product(bool, ResizeOldPLAB, true, \
1568 "Dynamically resize (old gen) promotion labs") \
1569 \
1570 product(bool, PrintOldPLAB, false, \
1571 "Print (old gen) promotion labs sizing decisions") \
1572 \
1573 product(uintx, CMSOldPLABMin, 16, \
1574 "Min size of CMS gen promotion lab caches per worker per blksize")\
1575 \
1576 product(uintx, CMSOldPLABMax, 1024, \
1577 "Max size of CMS gen promotion lab caches per worker per blksize")\
1578 \
1579 product(uintx, CMSOldPLABNumRefills, 4, \
1580 "Nominal number of refills of CMS gen promotion lab cache" \
1581 " per worker per block size") \
1582 \
1583 product(bool, CMSOldPLABResizeQuicker, false, \
1584 "Whether to react on-the-fly during a scavenge to a sudden" \
1585 " change in block demand rate") \
1586 \
1587 product(uintx, CMSOldPLABToleranceFactor, 4, \
1588 "The tolerance of the phase-change detector for on-the-fly" \
1589 " PLAB resizing during a scavenge") \
1590 \
1591 product(uintx, CMSOldPLABReactivityFactor, 2, \
1592 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1593 " during a scavenge") \
1594 \
1595 product(uintx, CMSOldPLABReactivityCeiling, 10, \
1596 "The clamping of the gain in the feedback loop for on-the-fly" \
1597 " PLAB resizing during a scavenge") \
1598 \
1599 product(bool, AlwaysPreTouch, false, \
1600 "It forces all freshly committed pages to be pre-touched.") \
1601 \
1602 product_pd(intx, CMSYoungGenPerWorker, \
1603 "The maximum size of young gen chosen by default per GC worker " \
1604 "thread available") \
1605 \
1606 product(bool, GCOverheadReporting, false, \
1607 "Enables the GC overhead reporting facility") \
1608 \
1609 product(intx, GCOverheadReportingPeriodMS, 100, \
1610 "Reporting period for conc GC overhead reporting, in ms ") \
1611 \
1612 product(bool, CMSIncrementalMode, false, \
1613 "Whether CMS GC should operate in \"incremental\" mode") \
1614 \
1615 product(uintx, CMSIncrementalDutyCycle, 10, \
1616 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1617 "CMSIncrementalPacing is enabled, then this is just the initial" \
1618 "value") \
1619 \
1620 product(bool, CMSIncrementalPacing, true, \
1621 "Whether the CMS incremental mode duty cycle should be " \
1622 "automatically adjusted") \
1623 \
1624 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1625 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1626 "enabled (a percentage, 0-100)") \
1627 \
1628 product(uintx, CMSIncrementalSafetyFactor, 10, \
1629 "Percentage (0-100) used to add conservatism when computing the " \
1630 "duty cycle") \
1631 \
1632 product(uintx, CMSIncrementalOffset, 0, \
1633 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1634 " is shifted to the right within the period between young GCs") \
1635 \
1636 product(uintx, CMSExpAvgFactor, 50, \
1637 "Percentage (0-100) used to weight the current sample when" \
1638 "computing exponential averages for CMS statistics.") \
1639 \
1640 product(uintx, CMS_FLSWeight, 75, \
1641 "Percentage (0-100) used to weight the current sample when" \
1642 "computing exponentially decating averages for CMS FLS statistics.") \
1643 \
1644 product(uintx, CMS_FLSPadding, 1, \
1645 "The multiple of deviation from mean to use for buffering" \
1646 "against volatility in free list demand.") \
1647 \
1648 product(uintx, FLSCoalescePolicy, 2, \
1649 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1650 \
1651 product(bool, FLSAlwaysCoalesceLarge, false, \
1652 "CMS: Larger free blocks are always available for coalescing") \
1653 \
1654 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1655 "CMS: the smaller the percentage the greater the coalition force")\
1656 \
1657 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1658 "CMS: the factor by which to inflate estimated demand of small" \
1659 " block sizes to prevent coalescing with an adjoining block") \
1660 \
1661 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1662 "CMS: the factor by which to inflate estimated demand of large" \
1663 " block sizes to prevent coalescing with an adjoining block") \
1664 \
1665 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1666 "CMS: the factor by which to inflate estimated demand of small" \
1667 " block sizes to prevent splitting to supply demand for smaller" \
1668 " blocks") \
1669 \
1670 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1671 "CMS: the factor by which to inflate estimated demand of large" \
1672 " block sizes to prevent splitting to supply demand for smaller" \
1673 " blocks") \
1674 \
1675 product(bool, CMSExtrapolateSweep, false, \
1676 "CMS: cushion for block demand during sweep") \
1677 \
1678 product(uintx, CMS_SweepWeight, 75, \
1679 "Percentage (0-100) used to weight the current sample when " \
1680 "computing exponentially decaying average for inter-sweep " \
1681 "duration") \
1682 \
1683 product(uintx, CMS_SweepPadding, 1, \
1684 "The multiple of deviation from mean to use for buffering " \
1685 "against volatility in inter-sweep duration.") \
1686 \
1687 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1688 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1689 "duration exceeds this threhold in milliseconds") \
1690 \
1691 develop(bool, CMSTraceIncrementalMode, false, \
1692 "Trace CMS incremental mode") \
1693 \
1694 develop(bool, CMSTraceIncrementalPacing, false, \
1695 "Trace CMS incremental mode pacing computation") \
1696 \
1697 develop(bool, CMSTraceThreadState, false, \
1698 "Trace the CMS thread state (enable the trace_state() method)") \
1699 \
1700 product(bool, CMSClassUnloadingEnabled, false, \
1701 "Whether class unloading enabled when using CMS GC") \
1702 \
1703 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1704 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1705 " for which classes may not be unloaded") \
1706 \
1707 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1708 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1709 \
1710 product(bool, UseCMSCompactAtFullCollection, true, \
1711 "Use mark sweep compact at full collections") \
1712 \
1713 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1714 "Number of CMS full collection done before compaction if > 0") \
1715 \
1716 develop(intx, CMSDictionaryChoice, 0, \
1717 "Use BinaryTreeDictionary as default in the CMS generation") \
1718 \
1719 product(uintx, CMSIndexedFreeListReplenish, 4, \
1720 "Replenish an indexed free list with this number of chunks") \
1721 \
1722 product(bool, CMSReplenishIntermediate, true, \
1723 "Replenish all intermediate free-list caches") \
1724 \
1725 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1726 "When satisfying batched demand, split blocks from the " \
1727 "IndexedFreeList whose size is a multiple of requested size") \
1728 \
1729 product(bool, CMSLoopWarn, false, \
1730 "Warn in case of excessive CMS looping") \
1731 \
1732 develop(bool, CMSOverflowEarlyRestoration, false, \
1733 "Whether preserved marks should be restored early") \
1734 \
1735 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1736 "Size of marking stack") \
1737 \
1738 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1739 "Max size of marking stack") \
1740 \
1741 notproduct(bool, CMSMarkStackOverflowALot, false, \
1742 "Whether we should simulate frequent marking stack / work queue" \
1743 " overflow") \
1744 \
1745 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1746 "An `interval' counter that determines how frequently" \
1747 " we simulate overflow; a smaller number increases frequency") \
1748 \
1749 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1750 "(Temporary, subject to experimentation)" \
1751 "Maximum number of abortable preclean iterations, if > 0") \
1752 \
1753 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1754 "(Temporary, subject to experimentation)" \
1755 "Maximum time in abortable preclean in ms") \
1756 \
1757 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1758 "(Temporary, subject to experimentation)" \
1759 "Nominal minimum work per abortable preclean iteration") \
1760 \
1761 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1762 "(Temporary, subject to experimentation)" \
1763 " Time that we sleep between iterations when not given" \
1764 " enough work per iteration") \
1765 \
1766 product(uintx, CMSRescanMultiple, 32, \
1767 "Size (in cards) of CMS parallel rescan task") \
1768 \
1769 product(uintx, CMSConcMarkMultiple, 32, \
1770 "Size (in cards) of CMS concurrent MT marking task") \
1771 \
1772 product(uintx, CMSRevisitStackSize, 1*M, \
1773 "Size of CMS KlassKlass revisit stack") \
1774 \
1775 product(bool, CMSAbortSemantics, false, \
1776 "Whether abort-on-overflow semantics is implemented") \
1777 \
1778 product(bool, CMSParallelRemarkEnabled, true, \
1779 "Whether parallel remark enabled (only if ParNewGC)") \
1780 \
1781 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1782 "Whether parallel remark of survivor space" \
1783 " enabled (effective only if CMSParallelRemarkEnabled)") \
1784 \
1785 product(bool, CMSPLABRecordAlways, true, \
1786 "Whether to always record survivor space PLAB bdries" \
1787 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1788 \
1789 product(bool, CMSConcurrentMTEnabled, true, \
1790 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1791 \
1792 product(bool, CMSPermGenPrecleaningEnabled, true, \
1793 "Whether concurrent precleaning enabled in perm gen" \
1794 " (effective only when CMSPrecleaningEnabled is true)") \
1795 \
1796 product(bool, CMSPrecleaningEnabled, true, \
1797 "Whether concurrent precleaning enabled") \
1798 \
1799 product(uintx, CMSPrecleanIter, 3, \
1800 "Maximum number of precleaning iteration passes") \
1801 \
1802 product(uintx, CMSPrecleanNumerator, 2, \
1803 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1804 " ratio") \
1805 \
1806 product(uintx, CMSPrecleanDenominator, 3, \
1807 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1808 " ratio") \
1809 \
1810 product(bool, CMSPrecleanRefLists1, true, \
1811 "Preclean ref lists during (initial) preclean phase") \
1812 \
1813 product(bool, CMSPrecleanRefLists2, false, \
1814 "Preclean ref lists during abortable preclean phase") \
1815 \
1816 product(bool, CMSPrecleanSurvivors1, false, \
1817 "Preclean survivors during (initial) preclean phase") \
1818 \
1819 product(bool, CMSPrecleanSurvivors2, true, \
1820 "Preclean survivors during abortable preclean phase") \
1821 \
1822 product(uintx, CMSPrecleanThreshold, 1000, \
1823 "Don't re-iterate if #dirty cards less than this") \
1824 \
1825 product(bool, CMSCleanOnEnter, true, \
1826 "Clean-on-enter optimization for reducing number of dirty cards") \
1827 \
1828 product(uintx, CMSRemarkVerifyVariant, 1, \
1829 "Choose variant (1,2) of verification following remark") \
1830 \
1831 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1832 "If Eden used is below this value, don't try to schedule remark") \
1833 \
1834 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1835 "The Eden occupancy % at which to try and schedule remark pause") \
1836 \
1837 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1838 "Start sampling Eden top at least before yg occupancy reaches" \
1839 " 1/<ratio> of the size at which we plan to schedule remark") \
1840 \
1841 product(uintx, CMSSamplingGrain, 16*K, \
1842 "The minimum distance between eden samples for CMS (see above)") \
1843 \
1844 product(bool, CMSScavengeBeforeRemark, false, \
1845 "Attempt scavenge before the CMS remark step") \
1846 \
1847 develop(bool, CMSTraceSweeper, false, \
1848 "Trace some actions of the CMS sweeper") \
1849 \
1850 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1851 "Don't drain below this size per parallel worker/thief") \
1852 \
1853 manageable(intx, CMSWaitDuration, 2000, \
1854 "Time in milliseconds that CMS thread waits for young GC") \
1855 \
1856 product(bool, CMSYield, true, \
1857 "Yield between steps of concurrent mark & sweep") \
1858 \
1859 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1860 "Bitmap operations should process at most this many bits" \
1861 "between yields") \
1862 \
1863 product(bool, CMSDumpAtPromotionFailure, false, \
1864 "Dump useful information about the state of the CMS old " \
1865 " generation upon a promotion failure.") \
1866 \
1867 product(bool, CMSPrintChunksInDump, false, \
1868 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1869 " more detailed information about the free chunks.") \
1870 \
1871 product(bool, CMSPrintObjectsInDump, false, \
1872 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1873 " more detailed information about the allocated objects.") \
1874 \
1875 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1876 "Verify that all refs across the FLS boundary " \
1877 " are to valid objects") \
1878 \
1879 diagnostic(bool, FLSVerifyLists, false, \
1880 "Do lots of (expensive) FreeListSpace verification") \
1881 \
1882 diagnostic(bool, FLSVerifyIndexTable, false, \
1883 "Do lots of (expensive) FLS index table verification") \
1884 \
1885 develop(bool, FLSVerifyDictionary, false, \
1886 "Do lots of (expensive) FLS dictionary verification") \
1887 \
1888 develop(bool, VerifyBlockOffsetArray, false, \
1889 "Do (expensive!) block offset array verification") \
1890 \
1891 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1892 "Maintain _unallocated_block in BlockOffsetArray" \
1893 " (currently applicable only to CMS collector)") \
1894 \
1895 develop(bool, TraceCMSState, false, \
1896 "Trace the state of the CMS collection") \
1897 \
1898 product(intx, RefDiscoveryPolicy, 0, \
1899 "Whether reference-based(0) or referent-based(1)") \
1900 \
1901 product(bool, ParallelRefProcEnabled, false, \
1902 "Enable parallel reference processing whenever possible") \
1903 \
1904 product(bool, ParallelRefProcBalancingEnabled, true, \
1905 "Enable balancing of reference processing queues") \
1906 \
1907 product(intx, CMSTriggerRatio, 80, \
1908 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1909 "allocated before a CMS collection cycle commences") \
1910 \
1911 product(intx, CMSTriggerPermRatio, 80, \
1912 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1913 "is allocated before a CMS collection cycle commences, that " \
1914 "also collects the perm generation") \
1915 \
1916 product(uintx, CMSBootstrapOccupancy, 50, \
1917 "Percentage CMS generation occupancy at which to " \
1918 "initiate CMS collection for bootstrapping collection stats") \
1919 \
1920 product(intx, CMSInitiatingOccupancyFraction, -1, \
1921 "Percentage CMS generation occupancy to start a CMS collection " \
1922 "cycle. A negative value means that CMSTriggerRatio is used") \
1923 \
1924 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1925 "Percentage of the (entire) heap occupancy to start a " \
1926 "concurrent GC cycle. It us used by GCs that trigger a " \
1927 "concurrent GC cycle based on the occupancy of the entire heap, " \
1928 "not just one of the generations (e.g., G1). A value of 0 " \
1929 "denotes 'do constant GC cycles'.") \
1930 \
1931 product(intx, CMSInitiatingPermOccupancyFraction, -1, \
1932 "Percentage CMS perm generation occupancy to start a " \
1933 "CMScollection cycle. A negative value means that " \
1934 "CMSTriggerPermRatio is used") \
1935 \
1936 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1937 "Only use occupancy as a crierion for starting a CMS collection") \
1938 \
1939 product(intx, CMSIsTooFullPercentage, 98, \
1940 "An absolute ceiling above which CMS will always consider the " \
1941 "perm gen ripe for collection") \
1942 \
1943 develop(bool, CMSTestInFreeList, false, \
1944 "Check if the coalesced range is already in the " \
1945 "free lists as claimed") \
1946 \
1947 notproduct(bool, CMSVerifyReturnedBytes, false, \
1948 "Check that all the garbage collected was returned to the " \
1949 "free lists.") \
1950 \
1951 notproduct(bool, ScavengeALot, false, \
1952 "Force scavenge at every Nth exit from the runtime system " \
1953 "(N=ScavengeALotInterval)") \
1954 \
1955 develop(bool, FullGCALot, false, \
1956 "Force full gc at every Nth exit from the runtime system " \
1957 "(N=FullGCALotInterval)") \
1958 \
1959 notproduct(bool, GCALotAtAllSafepoints, false, \
1960 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1961 \
1962 product(bool, PrintPromotionFailure, false, \
1963 "Print additional diagnostic information following " \
1964 " promotion failure") \
1965 \
1966 notproduct(bool, PromotionFailureALot, false, \
1967 "Use promotion failure handling on every youngest generation " \
1968 "collection") \
1969 \
1970 develop(uintx, PromotionFailureALotCount, 1000, \
1971 "Number of promotion failures occurring at ParGCAllocBuffer" \
1972 "refill attempts (ParNew) or promotion attempts " \
1973 "(other young collectors) ") \
1974 \
1975 develop(uintx, PromotionFailureALotInterval, 5, \
1976 "Total collections between promotion failures alot") \
1977 \
1978 experimental(intx, WorkStealingSleepMillis, 1, \
1979 "Sleep time when sleep is used for yields") \
1980 \
1981 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1982 "Number of yields before a sleep is done during workstealing") \
1983 \
1984 experimental(uintx, WorkStealingHardSpins, 4096, \
1985 "Number of iterations in a spin loop between checks on " \
1986 "time out of hard spin") \
1987 \
1988 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1989 "Ratio of hard spins to calls to yield") \
1990 \
1991 product(uintx, PreserveMarkStackSize, 1024, \
1992 "Size for stack used in promotion failure handling") \
1993 \
1994 develop(uintx, ObjArrayMarkingStride, 512, \
1995 "Number of ObjArray elements to push onto the marking stack" \
1996 "before pushing a continuation entry") \
1997 \
1998 notproduct(bool, ExecuteInternalVMTests, false, \
1999 "Enable execution of internal VM tests.") \
2000 \
2001 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2002 \
2003 product_pd(bool, ResizeTLAB, \
2004 "Dynamically resize tlab size for threads") \
2005 \
2006 product(bool, ZeroTLAB, false, \
2007 "Zero out the newly created TLAB") \
2008 \
2009 product(bool, FastTLABRefill, true, \
2010 "Use fast TLAB refill code") \
2011 \
2012 product(bool, PrintTLAB, false, \
2013 "Print various TLAB related information") \
2014 \
2015 product(bool, TLABStats, true, \
2016 "Print various TLAB related information") \
2017 \
2018 product(bool, UseBlockZeroing, false, \
2019 "Use special cpu instructions for block zeroing") \
2020 \
2021 product(intx, BlockZeroingLowLimit, 2048, \
2022 "Minimum size in bytes when block zeroing will be used") \
2023 \
2024 product(bool, UseBlockCopy, false, \
2025 "Use special cpu instructions for block copy") \
2026 \
2027 product(intx, BlockCopyLowLimit, 2048, \
2028 "Minimum size in bytes when block copy will be used") \
2029 \
2030 product(bool, PrintRevisitStats, false, \
2031 "Print revisit (klass and MDO) stack related information") \
2032 \
2033 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
2034 "Enable LowMemoryProtection")) \
2035 \
2036 product_pd(bool, NeverActAsServerClassMachine, \
2037 "Never act like a server-class machine") \
2038 \
2039 product(bool, AlwaysActAsServerClassMachine, false, \
2040 "Always act like a server-class machine") \
2041 \
2042 product_pd(uint64_t, MaxRAM, \
2043 "Real memory size (in bytes) used to set maximum heap size") \
2044 \
2045 product(uintx, ErgoHeapSizeLimit, 0, \
2046 "Maximum ergonomically set heap size (in bytes); zero means use " \
2047 "MaxRAM / MaxRAMFraction") \
2048 \
2049 product(uintx, MaxRAMFraction, 4, \
2050 "Maximum fraction (1/n) of real memory used for maximum heap " \
2051 "size") \
2052 \
2053 product(uintx, DefaultMaxRAMFraction, 4, \
2054 "Maximum fraction (1/n) of real memory used for maximum heap " \
2055 "size; deprecated: to be renamed to MaxRAMFraction") \
2056 \
2057 product(uintx, MinRAMFraction, 2, \
2058 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
2059 "size on systems with small physical memory size") \
2060 \
2061 product(uintx, InitialRAMFraction, 64, \
2062 "Fraction (1/n) of real memory used for initial heap size") \
2063 \
2064 product(bool, UseAutoGCSelectPolicy, false, \
2065 "Use automatic collection selection policy") \
2066 \
2067 product(uintx, AutoGCSelectPauseMillis, 5000, \
2068 "Automatic GC selection pause threshhold in ms") \
2069 \
2070 product(bool, UseAdaptiveSizePolicy, true, \
2071 "Use adaptive generation sizing policies") \
2072 \
2073 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2074 "Use adaptive survivor sizing policies") \
2075 \
2076 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2077 "Use adaptive young-old sizing policies at minor collections") \
2078 \
2079 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2080 "Use adaptive young-old sizing policies at major collections") \
2081 \
2082 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2083 "Use statistics from System.GC for adaptive size policy") \
2084 \
2085 product(bool, UseAdaptiveGCBoundary, false, \
2086 "Allow young-old boundary to move") \
2087 \
2088 develop(bool, TraceAdaptiveGCBoundary, false, \
2089 "Trace young-old boundary moves") \
2090 \
2091 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2092 "Resize the virtual spaces of the young or old generations") \
2093 \
2094 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2095 "Policy for changeing generation size for throughput goals") \
2096 \
2097 product(uintx, AdaptiveSizePausePolicy, 0, \
2098 "Policy for changing generation size for pause goals") \
2099 \
2100 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2101 "Adjust tenured generation to achive a minor pause goal") \
2102 \
2103 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2104 "Adjust young generation to achive a major pause goal") \
2105 \
2106 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2107 "Number of steps where heuristics is used before data is used") \
2108 \
2109 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2110 "Number of collections before the adaptive sizing is started") \
2111 \
2112 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2113 "Collecton interval for printing information; zero => never") \
2114 \
2115 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2116 "Use adaptive minimum footprint as a goal") \
2117 \
2118 product(uintx, AdaptiveSizePolicyWeight, 10, \
2119 "Weight given to exponential resizing, between 0 and 100") \
2120 \
2121 product(uintx, AdaptiveTimeWeight, 25, \
2122 "Weight given to time in adaptive policy, between 0 and 100") \
2123 \
2124 product(uintx, PausePadding, 1, \
2125 "How much buffer to keep for pause time") \
2126 \
2127 product(uintx, PromotedPadding, 3, \
2128 "How much buffer to keep for promotion failure") \
2129 \
2130 product(uintx, SurvivorPadding, 3, \
2131 "How much buffer to keep for survivor overflow") \
2132 \
2133 product(uintx, AdaptivePermSizeWeight, 20, \
2134 "Weight for perm gen exponential resizing, between 0 and 100") \
2135 \
2136 product(uintx, PermGenPadding, 3, \
2137 "How much buffer to keep for perm gen sizing") \
2138 \
2139 product(uintx, ThresholdTolerance, 10, \
2140 "Allowed collection cost difference between generations") \
2141 \
2142 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2143 "If collection costs are within margin, reduce both by full " \
2144 "delta") \
2145 \
2146 product(uintx, YoungGenerationSizeIncrement, 20, \
2147 "Adaptive size percentage change in young generation") \
2148 \
2149 product(uintx, YoungGenerationSizeSupplement, 80, \
2150 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2151 \
2152 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2153 "Decay factor to YoungedGenerationSizeSupplement") \
2154 \
2155 product(uintx, TenuredGenerationSizeIncrement, 20, \
2156 "Adaptive size percentage change in tenured generation") \
2157 \
2158 product(uintx, TenuredGenerationSizeSupplement, 80, \
2159 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2160 \
2161 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2162 "Decay factor to TenuredGenerationSizeIncrement") \
2163 \
2164 product(uintx, MaxGCPauseMillis, max_uintx, \
2165 "Adaptive size policy maximum GC pause time goal in msec, " \
2166 "or (G1 Only) the max. GC time per MMU time slice") \
2167 \
2168 product(uintx, GCPauseIntervalMillis, 0, \
2169 "Time slice for MMU specification") \
2170 \
2171 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2172 "Adaptive size policy maximum GC minor pause time goal in msec") \
2173 \
2174 product(uintx, GCTimeRatio, 99, \
2175 "Adaptive size policy application time to GC time ratio") \
2176 \
2177 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2178 "Adaptive size scale down factor for shrinking") \
2179 \
2180 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2181 "Adaptive size decays the major cost for long major intervals") \
2182 \
2183 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2184 "Time scale over which major costs decay") \
2185 \
2186 product(uintx, MinSurvivorRatio, 3, \
2187 "Minimum ratio of young generation/survivor space size") \
2188 \
2189 product(uintx, InitialSurvivorRatio, 8, \
2190 "Initial ratio of eden/survivor space size") \
2191 \
2192 product(uintx, BaseFootPrintEstimate, 256*M, \
2193 "Estimate of footprint other than Java Heap") \
2194 \
2195 product(bool, UseGCOverheadLimit, true, \
2196 "Use policy to limit of proportion of time spent in GC " \
2197 "before an OutOfMemory error is thrown") \
2198 \
2199 product(uintx, GCTimeLimit, 98, \
2200 "Limit of proportion of time spent in GC before an OutOfMemory" \
2201 "error is thrown (used with GCHeapFreeLimit)") \
2202 \
2203 product(uintx, GCHeapFreeLimit, 2, \
2204 "Minimum percentage of free space after a full GC before an " \
2205 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2206 \
2207 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2208 "Number of consecutive collections before gc time limit fires") \
2209 \
2210 product(bool, PrintAdaptiveSizePolicy, false, \
2211 "Print information about AdaptiveSizePolicy") \
2212 \
2213 product(intx, PrefetchCopyIntervalInBytes, -1, \
2214 "How far ahead to prefetch destination area (<= 0 means off)") \
2215 \
2216 product(intx, PrefetchScanIntervalInBytes, -1, \
2217 "How far ahead to prefetch scan area (<= 0 means off)") \
2218 \
2219 product(intx, PrefetchFieldsAhead, -1, \
2220 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2221 \
2222 develop(bool, UsePrefetchQueue, true, \
2223 "Use the prefetch queue during PS promotion") \
2224 \
2225 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2226 "Verify system before exiting") \
2227 \
2228 diagnostic(bool, VerifyBeforeGC, false, \
2229 "Verify memory system before GC") \
2230 \
2231 diagnostic(bool, VerifyAfterGC, false, \
2232 "Verify memory system after GC") \
2233 \
2234 diagnostic(bool, VerifyDuringGC, false, \
2235 "Verify memory system during GC (between phases)") \
2236 \
2237 diagnostic(bool, GCParallelVerificationEnabled, true, \
2238 "Enable parallel memory system verification") \
2239 \
2240 diagnostic(bool, DeferInitialCardMark, false, \
2241 "When +ReduceInitialCardMarks, explicitly defer any that " \
2242 "may arise from new_pre_store_barrier") \
2243 \
2244 diagnostic(bool, VerifyRememberedSets, false, \
2245 "Verify GC remembered sets") \
2246 \
2247 diagnostic(bool, VerifyObjectStartArray, true, \
2248 "Verify GC object start array if verify before/after") \
2249 \
2250 product(bool, DisableExplicitGC, false, \
2251 "Tells whether calling System.gc() does a full GC") \
2252 \
2253 notproduct(bool, CheckMemoryInitialization, false, \
2254 "Checks memory initialization") \
2255 \
2256 product(bool, CollectGen0First, false, \
2257 "Collect youngest generation before each full GC") \
2258 \
2259 diagnostic(bool, BindCMSThreadToCPU, false, \
2260 "Bind CMS Thread to CPU if possible") \
2261 \
2262 diagnostic(uintx, CPUForCMSThread, 0, \
2263 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2264 \
2265 product(bool, BindGCTaskThreadsToCPUs, false, \
2266 "Bind GCTaskThreads to CPUs if possible") \
2267 \
2268 product(bool, UseGCTaskAffinity, false, \
2269 "Use worker affinity when asking for GCTasks") \
2270 \
2271 product(uintx, ProcessDistributionStride, 4, \
2272 "Stride through processors when distributing processes") \
2273 \
2274 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2275 "number of times the coordinator GC thread will sleep while " \
2276 "yielding before giving up and resuming GC") \
2277 \
2278 product(uintx, CMSYieldSleepCount, 0, \
2279 "number of times a GC thread (minus the coordinator) " \
2280 "will sleep while yielding before giving up and resuming GC") \
2281 \
2282 /* gc tracing */ \
2283 manageable(bool, PrintGC, false, \
2284 "Print message at garbage collect") \
2285 \
2286 manageable(bool, PrintGCDetails, false, \
2287 "Print more details at garbage collect") \
2288 \
2289 manageable(bool, PrintGCDateStamps, false, \
2290 "Print date stamps at garbage collect") \
2291 \
2292 manageable(bool, PrintGCTimeStamps, false, \
2293 "Print timestamps at garbage collect") \
2294 \
2295 product(bool, PrintGCTaskTimeStamps, false, \
2296 "Print timestamps for individual gc worker thread tasks") \
2297 \
2298 develop(intx, ConcGCYieldTimeout, 0, \
2299 "If non-zero, assert that GC threads yield within this # of ms.") \
2300 \
2301 notproduct(bool, TraceMarkSweep, false, \
2302 "Trace mark sweep") \
2303 \
2304 product(bool, PrintReferenceGC, false, \
2305 "Print times spent handling reference objects during GC " \
2306 " (enabled only when PrintGCDetails)") \
2307 \
2308 develop(bool, TraceReferenceGC, false, \
2309 "Trace handling of soft/weak/final/phantom references") \
2310 \
2311 develop(bool, TraceFinalizerRegistration, false, \
2312 "Trace registration of final references") \
2313 \
2314 notproduct(bool, TraceScavenge, false, \
2315 "Trace scavenge") \
2316 \
2317 product_rw(bool, TraceClassLoading, false, \
2318 "Trace all classes loaded") \
2319 \
2320 product(bool, TraceClassLoadingPreorder, false, \
2321 "Trace all classes loaded in order referenced (not loaded)") \
2322 \
2323 product_rw(bool, TraceClassUnloading, false, \
2324 "Trace unloading of classes") \
2325 \
2326 product_rw(bool, TraceLoaderConstraints, false, \
2327 "Trace loader constraints") \
2328 \
2329 product(bool, TraceGen0Time, false, \
2330 "Trace accumulated time for Gen 0 collection") \
2331 \
2332 product(bool, TraceGen1Time, false, \
2333 "Trace accumulated time for Gen 1 collection") \
2334 \
2335 product(bool, PrintTenuringDistribution, false, \
2336 "Print tenuring age information") \
2337 \
2338 product_rw(bool, PrintHeapAtGC, false, \
2339 "Print heap layout before and after each GC") \
2340 \
2341 product_rw(bool, PrintHeapAtGCExtended, false, \
2342 "Prints extended information about the layout of the heap " \
2343 "when -XX:+PrintHeapAtGC is set") \
2344 \
2345 product(bool, PrintHeapAtSIGBREAK, true, \
2346 "Print heap layout in response to SIGBREAK") \
2347 \
2348 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2349 "Print a class histogram before any major stop-world GC") \
2350 \
2351 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2352 "Print a class histogram after any major stop-world GC") \
2353 \
2354 manageable(bool, PrintClassHistogram, false, \
2355 "Print a histogram of class instances") \
2356 \
2357 develop(bool, TraceWorkGang, false, \
2358 "Trace activities of work gangs") \
2359 \
2360 product(bool, TraceParallelOldGCTasks, false, \
2361 "Trace multithreaded GC activity") \
2362 \
2363 develop(bool, TraceBlockOffsetTable, false, \
2364 "Print BlockOffsetTable maps") \
2365 \
2366 develop(bool, TraceCardTableModRefBS, false, \
2367 "Print CardTableModRefBS maps") \
2368 \
2369 develop(bool, TraceGCTaskManager, false, \
2370 "Trace actions of the GC task manager") \
2371 \
2372 develop(bool, TraceGCTaskQueue, false, \
2373 "Trace actions of the GC task queues") \
2374 \
2375 diagnostic(bool, TraceGCTaskThread, false, \
2376 "Trace actions of the GC task threads") \
2377 \
2378 product(bool, PrintParallelOldGCPhaseTimes, false, \
2379 "Print the time taken by each parallel old gc phase." \
2380 "PrintGCDetails must also be enabled.") \
2381 \
2382 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2383 "Trace parallel old gc marking phase") \
2384 \
2385 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2386 "Trace parallel old gc summary phase") \
2387 \
2388 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2389 "Trace parallel old gc compaction phase") \
2390 \
2391 develop(bool, TraceParallelOldGCDensePrefix, false, \
2392 "Trace parallel old gc dense prefix computation") \
2393 \
2394 develop(bool, IgnoreLibthreadGPFault, false, \
2395 "Suppress workaround for libthread GP fault") \
2396 \
2397 product(bool, PrintJNIGCStalls, false, \
2398 "Print diagnostic message when GC is stalled" \
2399 "by JNI critical section") \
2400 \
2401 /* GC log rotation setting */ \
2402 \
2403 product(bool, UseGCLogFileRotation, false, \
2404 "Prevent large gclog file for long running app. " \
2405 "Requires -Xloggc:<filename>") \
2406 \
2407 product(uintx, NumberOfGCLogFiles, 0, \
2408 "Number of gclog files in rotation, " \
2409 "Default: 0, no rotation") \
2410 \
2411 product(uintx, GCLogFileSize, 0, \
2412 "GC log file size, Default: 0 bytes, no rotation " \
2413 "Only valid with UseGCLogFileRotation") \
2414 \
2415 /* JVMTI heap profiling */ \
2416 \
2417 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2418 "Trace JVMTI object tagging calls") \
2419 \
2420 diagnostic(bool, VerifyBeforeIteration, false, \
2421 "Verify memory system before JVMTI iteration") \
2422 \
2423 /* compiler interface */ \
2424 \
2425 develop(bool, CIPrintCompilerName, false, \
2426 "when CIPrint is active, print the name of the active compiler") \
2427 \
2428 develop(bool, CIPrintCompileQueue, false, \
2429 "display the contents of the compile queue whenever a " \
2430 "compilation is enqueued") \
2431 \
2432 develop(bool, CIPrintRequests, false, \
2433 "display every request for compilation") \
2434 \
2435 product(bool, CITime, false, \
2436 "collect timing information for compilation") \
2437 \
2438 develop(bool, CITimeEach, false, \
2439 "display timing information after each successful compilation") \
2440 \
2441 develop(bool, CICountOSR, true, \
2442 "use a separate counter when assigning ids to osr compilations") \
2443 \
2444 develop(bool, CICompileNatives, true, \
2445 "compile native methods if supported by the compiler") \
2446 \
2447 develop_pd(bool, CICompileOSR, \
2448 "compile on stack replacement methods if supported by the " \
2449 "compiler") \
2450 \
2451 develop(bool, CIPrintMethodCodes, false, \
2452 "print method bytecodes of the compiled code") \
2453 \
2454 develop(bool, CIPrintTypeFlow, false, \
2455 "print the results of ciTypeFlow analysis") \
2456 \
2457 develop(bool, CITraceTypeFlow, false, \
2458 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2459 \
2460 develop(intx, CICloneLoopTestLimit, 100, \
2461 "size limit for blocks heuristically cloned in ciTypeFlow") \
2462 \
2463 develop(intx, OSROnlyBCI, -1, \
2464 "OSR only at this bci. Negative values mean exclude that bci") \
2465 \
2466 /* temp diagnostics */ \
2467 \
2468 diagnostic(bool, TraceRedundantCompiles, false, \
2469 "Have compile broker print when a request already in the queue is"\
2470 " requested again") \
2471 \
2472 diagnostic(bool, InitialCompileFast, false, \
2473 "Initial compile at CompLevel_fast_compile") \
2474 \
2475 diagnostic(bool, InitialCompileReallyFast, false, \
2476 "Initial compile at CompLevel_really_fast_compile (no profile)") \
2477 \
2478 diagnostic(bool, FullProfileOnReInterpret, true, \
2479 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2480 \
2481 /* compiler */ \
2482 \
2483 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2484 "Number of compiler threads to run") \
2485 \
2486 product(intx, CompilationPolicyChoice, 0, \
2487 "which compilation policy (0/1)") \
2488 \
2489 develop(bool, UseStackBanging, true, \
2490 "use stack banging for stack overflow checks (required for " \
2491 "proper StackOverflow handling; disable only to measure cost " \
2492 "of stackbanging)") \
2493 \
2494 develop(bool, Use24BitFPMode, true, \
2495 "Set 24-bit FPU mode on a per-compile basis ") \
2496 \
2497 develop(bool, Use24BitFP, true, \
2498 "use FP instructions that produce 24-bit precise results") \
2499 \
2500 develop(bool, UseStrictFP, true, \
2501 "use strict fp if modifier strictfp is set") \
2502 \
2503 develop(bool, GenerateSynchronizationCode, true, \
2504 "generate locking/unlocking code for synchronized methods and " \
2505 "monitors") \
2506 \
2507 develop(bool, GenerateCompilerNullChecks, true, \
2508 "Generate explicit null checks for loads/stores/calls") \
2509 \
2510 develop(bool, GenerateRangeChecks, true, \
2511 "Generate range checks for array accesses") \
2512 \
2513 develop_pd(bool, ImplicitNullChecks, \
2514 "generate code for implicit null checks") \
2515 \
2516 product(bool, PrintSafepointStatistics, false, \
2517 "print statistics about safepoint synchronization") \
2518 \
2519 product(intx, PrintSafepointStatisticsCount, 300, \
2520 "total number of safepoint statistics collected " \
2521 "before printing them out") \
2522 \
2523 product(intx, PrintSafepointStatisticsTimeout, -1, \
2524 "print safepoint statistics only when safepoint takes" \
2525 " more than PrintSafepointSatisticsTimeout in millis") \
2526 \
2527 product(bool, TraceSafepointCleanupTime, false, \
2528 "print the break down of clean up tasks performed during" \
2529 " safepoint") \
2530 \
2531 develop(bool, InlineAccessors, true, \
2532 "inline accessor methods (get/set)") \
2533 \
2534 product(bool, Inline, true, \
2535 "enable inlining") \
2536 \
2537 product(bool, ClipInlining, true, \
2538 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2539 \
2540 develop(bool, UseCHA, true, \
2541 "enable CHA") \
2542 \
2543 product(bool, UseTypeProfile, true, \
2544 "Check interpreter profile for historically monomorphic calls") \
2545 \
2546 product(intx, TypeProfileMajorReceiverPercent, 90, \
2547 "% of major receiver type to all profiled receivers") \
2548 \
2549 notproduct(bool, TimeCompiler, false, \
2550 "time the compiler") \
2551 \
2552 notproduct(bool, TimeCompiler2, false, \
2553 "detailed time the compiler (requires +TimeCompiler)") \
2554 \
2555 diagnostic(bool, PrintInlining, false, \
2556 "prints inlining optimizations") \
2557 \
2558 diagnostic(bool, PrintIntrinsics, false, \
2559 "prints attempted and successful inlining of intrinsics") \
2560 \
2561 product(bool, UseCountLeadingZerosInstruction, false, \
2562 "Use count leading zeros instruction") \
2563 \
2564 product(bool, UsePopCountInstruction, false, \
2565 "Use population count instruction") \
2566 \
2567 diagnostic(ccstrlist, DisableIntrinsic, "", \
2568 "do not expand intrinsics whose (internal) names appear here") \
2569 \
2570 develop(bool, StressReflectiveCode, false, \
2571 "Use inexact types at allocations, etc., to test reflection") \
2572 \
2573 develop(bool, EagerInitialization, false, \
2574 "Eagerly initialize classes if possible") \
2575 \
2576 develop(bool, TraceMethodReplacement, false, \
2577 "Print when methods are replaced do to recompilation") \
2578 \
2579 develop(bool, PrintMethodFlushing, false, \
2580 "print the nmethods being flushed") \
2581 \
2582 notproduct(bool, LogMultipleMutexLocking, false, \
2583 "log locking and unlocking of mutexes (only if multiple locks " \
2584 "are held)") \
2585 \
2586 develop(bool, UseRelocIndex, false, \
2587 "use an index to speed random access to relocations") \
2588 \
2589 develop(bool, StressCodeBuffers, false, \
2590 "Exercise code buffer expansion and other rare state changes") \
2591 \
2592 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2593 "Generate extra debugging info for non-safepoints in nmethods") \
2594 \
2595 diagnostic(bool, DebugInlinedCalls, true, \
2596 "If false, restricts profiled locations to the root method only") \
2597 \
2598 product(bool, PrintVMOptions, false, \
2599 "Print flags that appeared on the command line") \
2600 \
2601 product(bool, IgnoreUnrecognizedVMOptions, false, \
2602 "Ignore unrecognized VM options") \
2603 \
2604 product(bool, PrintCommandLineFlags, false, \
2605 "Print flags specified on command line or set by ergonomics") \
2606 \
2607 product(bool, PrintFlagsInitial, false, \
2608 "Print all VM flags before argument processing and exit VM") \
2609 \
2610 product(bool, PrintFlagsFinal, false, \
2611 "Print all VM flags after argument and ergonomic processing") \
2612 \
2613 notproduct(bool, PrintFlagsWithComments, false, \
2614 "Print all VM flags with default values and descriptions and exit")\
2615 \
2616 diagnostic(bool, SerializeVMOutput, true, \
2617 "Use a mutex to serialize output to tty and hotspot.log") \
2618 \
2619 diagnostic(bool, DisplayVMOutput, true, \
2620 "Display all VM output on the tty, independently of LogVMOutput") \
2621 \
2622 diagnostic(bool, LogVMOutput, trueInDebug, \
2623 "Save VM output to hotspot.log, or to LogFile") \
2624 \
2625 diagnostic(ccstr, LogFile, NULL, \
2626 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2627 \
2628 product(ccstr, ErrorFile, NULL, \
2629 "If an error occurs, save the error data to this file " \
2630 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2631 \
2632 product(bool, DisplayVMOutputToStderr, false, \
2633 "If DisplayVMOutput is true, display all VM output to stderr") \
2634 \
2635 product(bool, DisplayVMOutputToStdout, false, \
2636 "If DisplayVMOutput is true, display all VM output to stdout") \
2637 \
2638 product(bool, UseHeavyMonitors, false, \
2639 "use heavyweight instead of lightweight Java monitors") \
2640 \
2641 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2642 "print histogram of the symbol table") \
2643 \
2644 notproduct(bool, ExitVMOnVerifyError, false, \
2645 "standard exit from VM if bytecode verify error " \
2646 "(only in debug mode)") \
2647 \
2648 notproduct(ccstr, AbortVMOnException, NULL, \
2649 "Call fatal if this exception is thrown. Example: " \
2650 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2651 \
2652 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2653 "Call fatal if the exception pointed by AbortVMOnException " \
2654 "has this message.") \
2655 \
2656 develop(bool, DebugVtables, false, \
2657 "add debugging code to vtable dispatch") \
2658 \
2659 develop(bool, PrintVtables, false, \
2660 "print vtables when printing klass") \
2661 \
2662 notproduct(bool, PrintVtableStats, false, \
2663 "print vtables stats at end of run") \
2664 \
2665 develop(bool, TraceCreateZombies, false, \
2666 "trace creation of zombie nmethods") \
2667 \
2668 notproduct(bool, IgnoreLockingAssertions, false, \
2669 "disable locking assertions (for speed)") \
2670 \
2671 notproduct(bool, VerifyLoopOptimizations, false, \
2672 "verify major loop optimizations") \
2673 \
2674 product(bool, RangeCheckElimination, true, \
2675 "Split loop iterations to eliminate range checks") \
2676 \
2677 develop_pd(bool, UncommonNullCast, \
2678 "track occurrences of null in casts; adjust compiler tactics") \
2679 \
2680 develop(bool, TypeProfileCasts, true, \
2681 "treat casts like calls for purposes of type profiling") \
2682 \
2683 develop(bool, MonomorphicArrayCheck, true, \
2684 "Uncommon-trap array store checks that require full type check") \
2685 \
2686 diagnostic(bool, ProfileDynamicTypes, true, \
2687 "do extra type profiling and use it more aggressively") \
2688 \
2689 develop(bool, DelayCompilationDuringStartup, true, \
2690 "Delay invoking the compiler until main application class is " \
2691 "loaded") \
2692 \
2693 develop(bool, CompileTheWorld, false, \
2694 "Compile all methods in all classes in bootstrap class path " \
2695 "(stress test)") \
2696 \
2697 develop(bool, CompileTheWorldPreloadClasses, true, \
2698 "Preload all classes used by a class before start loading") \
2699 \
2700 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2701 "Force a safepoint every n compiles so sweeper can keep up") \
2702 \
2703 develop(bool, TraceIterativeGVN, false, \
2704 "Print progress during Iterative Global Value Numbering") \
2705 \
2706 develop(bool, FillDelaySlots, true, \
2707 "Fill delay slots (on SPARC only)") \
2708 \
2709 develop(bool, VerifyIterativeGVN, false, \
2710 "Verify Def-Use modifications during sparse Iterative Global " \
2711 "Value Numbering") \
2712 \
2713 notproduct(bool, TracePhaseCCP, false, \
2714 "Print progress during Conditional Constant Propagation") \
2715 \
2716 develop(bool, TimeLivenessAnalysis, false, \
2717 "Time computation of bytecode liveness analysis") \
2718 \
2719 develop(bool, TraceLivenessGen, false, \
2720 "Trace the generation of liveness analysis information") \
2721 \
2722 notproduct(bool, TraceLivenessQuery, false, \
2723 "Trace queries of liveness analysis information") \
2724 \
2725 notproduct(bool, CollectIndexSetStatistics, false, \
2726 "Collect information about IndexSets") \
2727 \
2728 develop(bool, PrintDominators, false, \
2729 "Print out dominator trees for GVN") \
2730 \
2731 develop(bool, UseLoopSafepoints, true, \
2732 "Generate Safepoint nodes in every loop") \
2733 \
2734 notproduct(bool, TraceCISCSpill, false, \
2735 "Trace allocators use of cisc spillable instructions") \
2736 \
2737 notproduct(bool, TraceSpilling, false, \
2738 "Trace spilling") \
2739 \
2740 product(bool, SplitIfBlocks, true, \
2741 "Clone compares and control flow through merge points to fold " \
2742 "some branches") \
2743 \
2744 develop(intx, FastAllocateSizeLimit, 128*K, \
2745 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2746 "Inline allocations larger than this in doublewords must go slow")\
2747 \
2748 product(bool, AggressiveOpts, false, \
2749 "Enable aggressive optimizations - see arguments.cpp") \
2750 \
2751 product(bool, UseStringCache, false, \
2752 "Enable String cache capabilities on String.java") \
2753 \
2754 /* statistics */ \
2755 develop(bool, CountCompiledCalls, false, \
2756 "counts method invocations") \
2757 \
2758 notproduct(bool, CountRuntimeCalls, false, \
2759 "counts VM runtime calls") \
2760 \
2761 develop(bool, CountJNICalls, false, \
2762 "counts jni method invocations") \
2763 \
2764 notproduct(bool, CountJVMCalls, false, \
2765 "counts jvm method invocations") \
2766 \
2767 notproduct(bool, CountRemovableExceptions, false, \
2768 "count exceptions that could be replaced by branches due to " \
2769 "inlining") \
2770 \
2771 notproduct(bool, ICMissHistogram, false, \
2772 "produce histogram of IC misses") \
2773 \
2774 notproduct(bool, PrintClassStatistics, false, \
2775 "prints class statistics at end of run") \
2776 \
2777 notproduct(bool, PrintMethodStatistics, false, \
2778 "prints method statistics at end of run") \
2779 \
2780 /* interpreter */ \
2781 develop(bool, ClearInterpreterLocals, false, \
2782 "Always clear local variables of interpreter activations upon " \
2783 "entry") \
2784 \
2785 product_pd(bool, RewriteBytecodes, \
2786 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2787 \
2788 product_pd(bool, RewriteFrequentPairs, \
2789 "Rewrite frequently used bytecode pairs into a single bytecode") \
2790 \
2791 diagnostic(bool, PrintInterpreter, false, \
2792 "Prints the generated interpreter code") \
2793 \
2794 product(bool, UseInterpreter, true, \
2795 "Use interpreter for non-compiled methods") \
2796 \
2797 develop(bool, UseFastSignatureHandlers, true, \
2798 "Use fast signature handlers for native calls") \
2799 \
2800 develop(bool, UseV8InstrsOnly, false, \
2801 "Use SPARC-V8 Compliant instruction subset") \
2802 \
2803 product(bool, UseNiagaraInstrs, false, \
2804 "Use Niagara-efficient instruction subset") \
2805 \
2806 develop(bool, UseCASForSwap, false, \
2807 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2808 \
2809 product(bool, UseLoopCounter, true, \
2810 "Increment invocation counter on backward branch") \
2811 \
2812 product(bool, UseFastEmptyMethods, true, \
2813 "Use fast method entry code for empty methods") \
2814 \
2815 product(bool, UseFastAccessorMethods, true, \
2816 "Use fast method entry code for accessor methods") \
2817 \
2818 product_pd(bool, UseOnStackReplacement, \
2819 "Use on stack replacement, calls runtime if invoc. counter " \
2820 "overflows in loop") \
2821 \
2822 notproduct(bool, TraceOnStackReplacement, false, \
2823 "Trace on stack replacement") \
2824 \
2825 develop(bool, PoisonOSREntry, true, \
2826 "Detect abnormal calls to OSR code") \
2827 \
2828 product_pd(bool, PreferInterpreterNativeStubs, \
2829 "Use always interpreter stubs for native methods invoked via " \
2830 "interpreter") \
2831 \
2832 develop(bool, CountBytecodes, false, \
2833 "Count number of bytecodes executed") \
2834 \
2835 develop(bool, PrintBytecodeHistogram, false, \
2836 "Print histogram of the executed bytecodes") \
2837 \
2838 develop(bool, PrintBytecodePairHistogram, false, \
2839 "Print histogram of the executed bytecode pairs") \
2840 \
2841 diagnostic(bool, PrintSignatureHandlers, false, \
2842 "Print code generated for native method signature handlers") \
2843 \
2844 develop(bool, VerifyOops, false, \
2845 "Do plausibility checks for oops") \
2846 \
2847 develop(bool, CheckUnhandledOops, false, \
2848 "Check for unhandled oops in VM code") \
2849 \
2850 develop(bool, VerifyJNIFields, trueInDebug, \
2851 "Verify jfieldIDs for instance fields") \
2852 \
2853 notproduct(bool, VerifyJNIEnvThread, false, \
2854 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2855 "from JNI") \
2856 \
2857 develop(bool, VerifyFPU, false, \
2858 "Verify FPU state (check for NaN's, etc.)") \
2859 \
2860 develop(bool, VerifyThread, false, \
2861 "Watch the thread register for corruption (SPARC only)") \
2862 \
2863 develop(bool, VerifyActivationFrameSize, false, \
2864 "Verify that activation frame didn't become smaller than its " \
2865 "minimal size") \
2866 \
2867 develop(bool, TraceFrequencyInlining, false, \
2868 "Trace frequency based inlining") \
2869 \
2870 notproduct(bool, TraceTypeProfile, false, \
2871 "Trace type profile") \
2872 \
2873 develop_pd(bool, InlineIntrinsics, \
2874 "Inline intrinsics that can be statically resolved") \
2875 \
2876 product_pd(bool, ProfileInterpreter, \
2877 "Profile at the bytecode level during interpretation") \
2878 \
2879 develop_pd(bool, ProfileTraps, \
2880 "Profile deoptimization traps at the bytecode level") \
2881 \
2882 product(intx, ProfileMaturityPercentage, 20, \
2883 "number of method invocations/branches (expressed as % of " \
2884 "CompileThreshold) before using the method's profile") \
2885 \
2886 develop(bool, PrintMethodData, false, \
2887 "Print the results of +ProfileInterpreter at end of run") \
2888 \
2889 develop(bool, VerifyDataPointer, trueInDebug, \
2890 "Verify the method data pointer during interpreter profiling") \
2891 \
2892 develop(bool, VerifyCompiledCode, false, \
2893 "Include miscellaneous runtime verifications in nmethod code; " \
2894 "default off because it disturbs nmethod size heuristics") \
2895 \
2896 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2897 "Manually make GC thread crash then dump java stack trace; " \
2898 "Test only") \
2899 \
2900 /* compilation */ \
2901 product(bool, UseCompiler, true, \
2902 "use compilation") \
2903 \
2904 develop(bool, TraceCompilationPolicy, false, \
2905 "Trace compilation policy") \
2906 \
2907 develop(bool, TimeCompilationPolicy, false, \
2908 "Time the compilation policy") \
2909 \
2910 product(bool, UseCounterDecay, true, \
2911 "adjust recompilation counters") \
2912 \
2913 develop(intx, CounterHalfLifeTime, 30, \
2914 "half-life time of invocation counters (in secs)") \
2915 \
2916 develop(intx, CounterDecayMinIntervalLength, 500, \
2917 "Min. ms. between invocation of CounterDecay") \
2918 \
2919 product(bool, AlwaysCompileLoopMethods, false, \
2920 "when using recompilation, never interpret methods " \
2921 "containing loops") \
2922 \
2923 product(bool, DontCompileHugeMethods, true, \
2924 "don't compile methods > HugeMethodLimit") \
2925 \
2926 /* Bytecode escape analysis estimation. */ \
2927 product(bool, EstimateArgEscape, true, \
2928 "Analyze bytecodes to estimate escape state of arguments") \
2929 \
2930 product(intx, BCEATraceLevel, 0, \
2931 "How much tracing to do of bytecode escape analysis estimates") \
2932 \
2933 product(intx, MaxBCEAEstimateLevel, 5, \
2934 "Maximum number of nested calls that are analyzed by BC EA.") \
2935 \
2936 product(intx, MaxBCEAEstimateSize, 150, \
2937 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2938 \
2939 product(intx, AllocatePrefetchStyle, 1, \
2940 "0 = no prefetch, " \
2941 "1 = prefetch instructions for each allocation, " \
2942 "2 = use TLAB watermark to gate allocation prefetch, " \
2943 "3 = use BIS instruction on Sparc for allocation prefetch") \
2944 \
2945 product(intx, AllocatePrefetchDistance, -1, \
2946 "Distance to prefetch ahead of allocation pointer") \
2947 \
2948 product(intx, AllocatePrefetchLines, 3, \
2949 "Number of lines to prefetch ahead of array allocation pointer") \
2950 \
2951 product(intx, AllocateInstancePrefetchLines, 1, \
2952 "Number of lines to prefetch ahead of instance allocation pointer") \
2953 \
2954 product(intx, AllocatePrefetchStepSize, 16, \
2955 "Step size in bytes of sequential prefetch instructions") \
2956 \
2957 product(intx, AllocatePrefetchInstr, 0, \
2958 "Prefetch instruction to prefetch ahead of allocation pointer") \
2959 \
2960 product(intx, ReadPrefetchInstr, 0, \
2961 "Prefetch instruction to prefetch ahead") \
2962 \
2963 product(uintx, ArraycopySrcPrefetchDistance, 0, \
2964 "Distance to prefetch source array in arracopy") \
2965 \
2966 product(uintx, ArraycopyDstPrefetchDistance, 0, \
2967 "Distance to prefetch destination array in arracopy") \
2968 \
2969 /* deoptimization */ \
2970 develop(bool, TraceDeoptimization, false, \
2971 "Trace deoptimization") \
2972 \
2973 develop(bool, DebugDeoptimization, false, \
2974 "Tracing various information while debugging deoptimization") \
2975 \
2976 product(intx, SelfDestructTimer, 0, \
2977 "Will cause VM to terminate after a given time (in minutes) " \
2978 "(0 means off)") \
2979 \
2980 product(intx, MaxJavaStackTraceDepth, 1024, \
2981 "Max. no. of lines in the stack trace for Java exceptions " \
2982 "(0 means all)") \
2983 \
2984 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2985 "Guarantee a safepoint (at least) every so many milliseconds " \
2986 "(0 means none)")) \
2987 \
2988 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2989 "Guarantee a safepoint (at least) every so many milliseconds " \
2990 "(0 means none)")) \
2991 \
2992 product(intx, SafepointTimeoutDelay, 10000, \
2993 "Delay in milliseconds for option SafepointTimeout") \
2994 \
2995 product(intx, NmethodSweepFraction, 4, \
2996 "Number of invocations of sweeper to cover all nmethods") \
2997 \
2998 product(intx, NmethodSweepCheckInterval, 5, \
2999 "Compilers wake up every n seconds to possibly sweep nmethods") \
3000 \
3001 notproduct(bool, LogSweeper, false, \
3002 "Keep a ring buffer of sweeper activity") \
3003 \
3004 notproduct(intx, SweeperLogEntries, 1024, \
3005 "Number of records in the ring buffer of sweeper activity") \
3006 \
3007 notproduct(intx, MemProfilingInterval, 500, \
3008 "Time between each invocation of the MemProfiler") \
3009 \
3010 develop(intx, MallocCatchPtr, -1, \
3011 "Hit breakpoint when mallocing/freeing this pointer") \
3012 \
3013 notproduct(intx, AssertRepeat, 1, \
3014 "number of times to evaluate expression in assert " \
3015 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
3016 \
3017 notproduct(ccstrlist, SuppressErrorAt, "", \
3018 "List of assertions (file:line) to muzzle") \
3019 \
3020 notproduct(uintx, HandleAllocationLimit, 1024, \
3021 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3022 "is used") \
3023 \
3024 develop(uintx, TotalHandleAllocationLimit, 1024, \
3025 "Threshold for total handle allocation when " \
3026 "+TraceHandleAllocation is used") \
3027 \
3028 develop(intx, StackPrintLimit, 100, \
3029 "number of stack frames to print in VM-level stack dump") \
3030 \
3031 notproduct(intx, MaxElementPrintSize, 256, \
3032 "maximum number of elements to print") \
3033 \
3034 notproduct(intx, MaxSubklassPrintSize, 4, \
3035 "maximum number of subklasses to print when printing klass") \
3036 \
3037 product(intx, MaxInlineLevel, 9, \
3038 "maximum number of nested calls that are inlined") \
3039 \
3040 product(intx, MaxRecursiveInlineLevel, 1, \
3041 "maximum number of nested recursive calls that are inlined") \
3042 \
3043 product_pd(intx, InlineSmallCode, \
3044 "Only inline already compiled methods if their code size is " \
3045 "less than this") \
3046 \
3047 product(intx, MaxInlineSize, 35, \
3048 "maximum bytecode size of a method to be inlined") \
3049 \
3050 product_pd(intx, FreqInlineSize, \
3051 "maximum bytecode size of a frequent method to be inlined") \
3052 \
3053 product(intx, MaxTrivialSize, 6, \
3054 "maximum bytecode size of a trivial method to be inlined") \
3055 \
3056 product(intx, MinInliningThreshold, 250, \
3057 "min. invocation count a method needs to have to be inlined") \
3058 \
3059 develop(intx, AlignEntryCode, 4, \
3060 "aligns entry code to specified value (in bytes)") \
3061 \
3062 develop(intx, MethodHistogramCutoff, 100, \
3063 "cutoff value for method invoc. histogram (+CountCalls)") \
3064 \
3065 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3066 "# of interpreted methods to show in profile") \
3067 \
3068 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3069 "# of compiled methods to show in profile") \
3070 \
3071 develop(intx, ProfilerNumberOfStubMethods, 25, \
3072 "# of stub methods to show in profile") \
3073 \
3074 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3075 "# of runtime stub nodes to show in profile") \
3076 \
3077 product(intx, ProfileIntervalsTicks, 100, \
3078 "# of ticks between printing of interval profile " \
3079 "(+ProfileIntervals)") \
3080 \
3081 notproduct(intx, ScavengeALotInterval, 1, \
3082 "Interval between which scavenge will occur with +ScavengeALot") \
3083 \
3084 notproduct(intx, FullGCALotInterval, 1, \
3085 "Interval between which full gc will occur with +FullGCALot") \
3086 \
3087 notproduct(intx, FullGCALotStart, 0, \
3088 "For which invocation to start FullGCAlot") \
3089 \
3090 notproduct(intx, FullGCALotDummies, 32*K, \
3091 "Dummy object allocated with +FullGCALot, forcing all objects " \
3092 "to move") \
3093 \
3094 develop(intx, DontYieldALotInterval, 10, \
3095 "Interval between which yields will be dropped (milliseconds)") \
3096 \
3097 develop(intx, MinSleepInterval, 1, \
3098 "Minimum sleep() interval (milliseconds) when " \
3099 "ConvertSleepToYield is off (used for SOLARIS)") \
3100 \
3101 product(intx, EventLogLength, 2000, \
3102 "maximum nof events in event log") \
3103 \
3104 develop(intx, ProfilerPCTickThreshold, 15, \
3105 "Number of ticks in a PC buckets to be a hotspot") \
3106 \
3107 notproduct(intx, DeoptimizeALotInterval, 5, \
3108 "Number of exits until DeoptimizeALot kicks in") \
3109 \
3110 notproduct(intx, ZombieALotInterval, 5, \
3111 "Number of exits until ZombieALot kicks in") \
3112 \
3113 develop(bool, StressNonEntrant, false, \
3114 "Mark nmethods non-entrant at registration") \
3115 \
3116 diagnostic(intx, MallocVerifyInterval, 0, \
3117 "if non-zero, verify C heap after every N calls to " \
3118 "malloc/realloc/free") \
3119 \
3120 diagnostic(intx, MallocVerifyStart, 0, \
3121 "if non-zero, start verifying C heap after Nth call to " \
3122 "malloc/realloc/free") \
3123 \
3124 product(intx, TypeProfileWidth, 2, \
3125 "number of receiver types to record in call/cast profile") \
3126 \
3127 develop(intx, BciProfileWidth, 2, \
3128 "number of return bci's to record in ret profile") \
3129 \
3130 product(intx, PerMethodRecompilationCutoff, 400, \
3131 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3132 \
3133 product(intx, PerBytecodeRecompilationCutoff, 200, \
3134 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3135 \
3136 product(intx, PerMethodTrapLimit, 100, \
3137 "Limit on traps (of one kind) in a method (includes inlines)") \
3138 \
3139 product(intx, PerBytecodeTrapLimit, 4, \
3140 "Limit on traps (of one kind) at a particular BCI") \
3141 \
3142 develop(intx, FreqCountInvocations, 1, \
3143 "Scaling factor for branch frequencies (deprecated)") \
3144 \
3145 develop(intx, InlineFrequencyRatio, 20, \
3146 "Ratio of call site execution to caller method invocation") \
3147 \
3148 develop_pd(intx, InlineFrequencyCount, \
3149 "Count of call site execution necessary to trigger frequent " \
3150 "inlining") \
3151 \
3152 develop(intx, InlineThrowCount, 50, \
3153 "Force inlining of interpreted methods that throw this often") \
3154 \
3155 develop(intx, InlineThrowMaxSize, 200, \
3156 "Force inlining of throwing methods smaller than this") \
3157 \
3158 product(intx, AliasLevel, 3, \
3159 "0 for no aliasing, 1 for oop/field/static/array split, " \
3160 "2 for class split, 3 for unique instances") \
3161 \
3162 develop(bool, VerifyAliases, false, \
3163 "perform extra checks on the results of alias analysis") \
3164 \
3165 develop(intx, ProfilerNodeSize, 1024, \
3166 "Size in K to allocate for the Profile Nodes of each thread") \
3167 \
3168 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \
3169 "Number of times to spin wait on a v8 atomic operation lock") \
3170 \
3171 product(intx, ReadSpinIterations, 100, \
3172 "Number of read attempts before a yield (spin inner loop)") \
3173 \
3174 product_pd(intx, PreInflateSpin, \
3175 "Number of times to spin wait before inflation") \
3176 \
3177 product(intx, PreBlockSpin, 10, \
3178 "Number of times to spin in an inflated lock before going to " \
3179 "an OS lock") \
3180 \
3181 /* gc parameters */ \
3182 product(uintx, InitialHeapSize, 0, \
3183 "Initial heap size (in bytes); zero means OldSize + NewSize") \
3184 \
3185 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3186 "Maximum heap size (in bytes)") \
3187 \
3188 product(uintx, OldSize, ScaleForWordSize(4*M), \
3189 "Initial tenured generation size (in bytes)") \
3190 \
3191 product(uintx, NewSize, ScaleForWordSize(1*M), \
3192 "Initial new generation size (in bytes)") \
3193 \
3194 product(uintx, MaxNewSize, max_uintx, \
3195 "Maximum new generation size (in bytes), max_uintx means set " \
3196 "ergonomically") \
3197 \
3198 product(uintx, PretenureSizeThreshold, 0, \
3199 "Maximum size in bytes of objects allocated in DefNew " \
3200 "generation; zero means no maximum") \
3201 \
3202 product(uintx, TLABSize, 0, \
3203 "Starting TLAB size (in bytes); zero means set ergonomically") \
3204 \
3205 product(uintx, MinTLABSize, 2*K, \
3206 "Minimum allowed TLAB size (in bytes)") \
3207 \
3208 product(uintx, TLABAllocationWeight, 35, \
3209 "Allocation averaging weight") \
3210 \
3211 product(uintx, TLABWasteTargetPercent, 1, \
3212 "Percentage of Eden that can be wasted") \
3213 \
3214 product(uintx, TLABRefillWasteFraction, 64, \
3215 "Max TLAB waste at a refill (internal fragmentation)") \
3216 \
3217 product(uintx, TLABWasteIncrement, 4, \
3218 "Increment allowed waste at slow allocation") \
3219 \
3220 product(intx, SurvivorRatio, 8, \
3221 "Ratio of eden/survivor space size") \
3222 \
3223 product(intx, NewRatio, 2, \
3224 "Ratio of new/old generation sizes") \
3225 \
3226 product_pd(uintx, NewSizeThreadIncrease, \
3227 "Additional size added to desired new generation size per " \
3228 "non-daemon thread (in bytes)") \
3229 \
3230 product_pd(uintx, PermSize, \
3231 "Initial size of permanent generation (in bytes)") \
3232 \
3233 product_pd(uintx, MaxPermSize, \
3234 "Maximum size of permanent generation (in bytes)") \
3235 \
3236 product(uintx, MinHeapFreeRatio, 40, \
3237 "Min percentage of heap free after GC to avoid expansion") \
3238 \
3239 product(uintx, MaxHeapFreeRatio, 70, \
3240 "Max percentage of heap free after GC to avoid shrinking") \
3241 \
3242 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3243 "Number of milliseconds per MB of free space in the heap") \
3244 \
3245 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3246 "Min change in heap space due to GC (in bytes)") \
3247 \
3248 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \
3249 "Min expansion of permanent heap (in bytes)") \
3250 \
3251 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \
3252 "Max expansion of permanent heap without full GC (in bytes)") \
3253 \
3254 product(intx, QueuedAllocationWarningCount, 0, \
3255 "Number of times an allocation that queues behind a GC " \
3256 "will retry before printing a warning") \
3257 \
3258 diagnostic(uintx, VerifyGCStartAt, 0, \
3259 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3260 \
3261 diagnostic(intx, VerifyGCLevel, 0, \
3262 "Generation level at which to start +VerifyBefore/AfterGC") \
3263 \
3264 develop(uintx, ExitAfterGCNum, 0, \
3265 "If non-zero, exit after this GC.") \
3266 \
3267 product(intx, MaxTenuringThreshold, 15, \
3268 "Maximum value for tenuring threshold") \
3269 \
3270 product(intx, InitialTenuringThreshold, 7, \
3271 "Initial value for tenuring threshold") \
3272 \
3273 product(intx, TargetSurvivorRatio, 50, \
3274 "Desired percentage of survivor space used after scavenge") \
3275 \
3276 product(uintx, MarkSweepDeadRatio, 5, \
3277 "Percentage (0-100) of the old gen allowed as dead wood." \
3278 "Serial mark sweep treats this as both the min and max value." \
3279 "CMS uses this value only if it falls back to mark sweep." \
3280 "Par compact uses a variable scale based on the density of the" \
3281 "generation and treats this as the max value when the heap is" \
3282 "either completely full or completely empty. Par compact also" \
3283 "has a smaller default value; see arguments.cpp.") \
3284 \
3285 product(uintx, PermMarkSweepDeadRatio, 20, \
3286 "Percentage (0-100) of the perm gen allowed as dead wood." \
3287 "See MarkSweepDeadRatio for collector-specific comments.") \
3288 \
3289 product(intx, MarkSweepAlwaysCompactCount, 4, \
3290 "How often should we fully compact the heap (ignoring the dead " \
3291 "space parameters)") \
3292 \
3293 product(intx, PrintCMSStatistics, 0, \
3294 "Statistics for CMS") \
3295 \
3296 product(bool, PrintCMSInitiationStatistics, false, \
3297 "Statistics for initiating a CMS collection") \
3298 \
3299 product(intx, PrintFLSStatistics, 0, \
3300 "Statistics for CMS' FreeListSpace") \
3301 \
3302 product(intx, PrintFLSCensus, 0, \
3303 "Census for CMS' FreeListSpace") \
3304 \
3305 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3306 "Delay in ms between expansion and allocation") \
3307 \
3308 product(intx, DeferThrSuspendLoopCount, 4000, \
3309 "(Unstable) Number of times to iterate in safepoint loop " \
3310 " before blocking VM threads ") \
3311 \
3312 product(intx, DeferPollingPageLoopCount, -1, \
3313 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3314 "before changing safepoint polling page to RO ") \
3315 \
3316 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3317 \
3318 product(bool, PSChunkLargeArrays, true, \
3319 "true: process large arrays in chunks") \
3320 \
3321 product(uintx, GCDrainStackTargetSize, 64, \
3322 "how many entries we'll try to leave on the stack during " \
3323 "parallel GC") \
3324 \
3325 /* stack parameters */ \
3326 product_pd(intx, StackYellowPages, \
3327 "Number of yellow zone (recoverable overflows) pages") \
3328 \
3329 product_pd(intx, StackRedPages, \
3330 "Number of red zone (unrecoverable overflows) pages") \
3331 \
3332 product_pd(intx, StackShadowPages, \
3333 "Number of shadow zone (for overflow checking) pages" \
3334 " this should exceed the depth of the VM and native call stack") \
3335 \
3336 product_pd(intx, ThreadStackSize, \
3337 "Thread Stack Size (in Kbytes)") \
3338 \
3339 product_pd(intx, VMThreadStackSize, \
3340 "Non-Java Thread Stack Size (in Kbytes)") \
3341 \
3342 product_pd(intx, CompilerThreadStackSize, \
3343 "Compiler Thread Stack Size (in Kbytes)") \
3344 \
3345 develop_pd(uintx, JVMInvokeMethodSlack, \
3346 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3347 \
3348 product(uintx, ThreadSafetyMargin, 50*M, \
3349 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3350 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3351 "disable this feature") \
3352 \
3353 /* code cache parameters */ \
3354 develop(uintx, CodeCacheSegmentSize, 64, \
3355 "Code cache segment size (in bytes) - smallest unit of " \
3356 "allocation") \
3357 \
3358 develop_pd(intx, CodeEntryAlignment, \
3359 "Code entry alignment for generated code (in bytes)") \
3360 \
3361 product_pd(intx, OptoLoopAlignment, \
3362 "Align inner loops to zero relative to this modulus") \
3363 \
3364 product_pd(uintx, InitialCodeCacheSize, \
3365 "Initial code cache size (in bytes)") \
3366 \
3367 product_pd(uintx, ReservedCodeCacheSize, \
3368 "Reserved code cache size (in bytes) - maximum code cache size") \
3369 \
3370 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3371 "When less than X space left, we stop compiling.") \
3372 \
3373 product_pd(uintx, CodeCacheExpansionSize, \
3374 "Code cache expansion size (in bytes)") \
3375 \
3376 develop_pd(uintx, CodeCacheMinBlockLength, \
3377 "Minimum number of segments in a code cache block.") \
3378 \
3379 notproduct(bool, ExitOnFullCodeCache, false, \
3380 "Exit the VM if we fill the code cache.") \
3381 \
3382 product(bool, UseCodeCacheFlushing, true, \
3383 "Attempt to clean the code cache before shutting off compiler") \
3384 \
3385 product(intx, MinCodeCacheFlushingInterval, 30, \
3386 "Min number of seconds between code cache cleaning sessions") \
3387 \
3388 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \
3389 "When less than X space left, start code cache cleaning") \
3390 \
3391 /* interpreter debugging */ \
3392 develop(intx, BinarySwitchThreshold, 5, \
3393 "Minimal number of lookupswitch entries for rewriting to binary " \
3394 "switch") \
3395 \
3396 develop(intx, StopInterpreterAt, 0, \
3397 "Stops interpreter execution at specified bytecode number") \
3398 \
3399 develop(intx, TraceBytecodesAt, 0, \
3400 "Traces bytecodes starting with specified bytecode number") \
3401 \
3402 /* compiler interface */ \
3403 develop(intx, CIStart, 0, \
3404 "the id of the first compilation to permit") \
3405 \
3406 develop(intx, CIStop, -1, \
3407 "the id of the last compilation to permit") \
3408 \
3409 develop(intx, CIStartOSR, 0, \
3410 "the id of the first osr compilation to permit " \
3411 "(CICountOSR must be on)") \
3412 \
3413 develop(intx, CIStopOSR, -1, \
3414 "the id of the last osr compilation to permit " \
3415 "(CICountOSR must be on)") \
3416 \
3417 develop(intx, CIBreakAtOSR, -1, \
3418 "id of osr compilation to break at") \
3419 \
3420 develop(intx, CIBreakAt, -1, \
3421 "id of compilation to break at") \
3422 \
3423 product(ccstrlist, CompileOnly, "", \
3424 "List of methods (pkg/class.name) to restrict compilation to") \
3425 \
3426 product(ccstr, CompileCommandFile, NULL, \
3427 "Read compiler commands from this file [.hotspot_compiler]") \
3428 \
3429 product(ccstrlist, CompileCommand, "", \
3430 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3431 \
3432 product(bool, CICompilerCountPerCPU, false, \
3433 "1 compiler thread for log(N CPUs)") \
3434 \
3435 develop(intx, CIFireOOMAt, -1, \
3436 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3437 "(non-negative value throws OOM after this many CI accesses " \
3438 "in each compile)") \
3439 \
3440 develop(intx, CIFireOOMAtDelay, -1, \
3441 "Wait for this many CI accesses to occur in all compiles before " \
3442 "beginning to throw OutOfMemoryErrors in each compile") \
3443 \
3444 notproduct(bool, CIObjectFactoryVerify, false, \
3445 "enable potentially expensive verification in ciObjectFactory") \
3446 \
3447 /* Priorities */ \
3448 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3449 \
3450 product(intx, ThreadPriorityPolicy, 0, \
3451 "0 : Normal. "\
3452 " VM chooses priorities that are appropriate for normal "\
3453 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3454 " to normal native priority. Java priorities below NORM_PRIORITY"\
3455 " map to lower native priority values. On Windows applications"\
3456 " are allowed to use higher native priorities. However, with "\
3457 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3458 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3459 " interfere with system threads. On Linux thread priorities "\
3460 " are ignored because the OS does not support static priority "\
3461 " in SCHED_OTHER scheduling class which is the only choice for"\
3462 " non-root, non-realtime applications. "\
3463 "1 : Aggressive. "\
3464 " Java thread priorities map over to the entire range of "\
3465 " native thread priorities. Higher Java thread priorities map "\
3466 " to higher native thread priorities. This policy should be "\
3467 " used with care, as sometimes it can cause performance "\
3468 " degradation in the application and/or the entire system. On "\
3469 " Linux this policy requires root privilege.") \
3470 \
3471 product(bool, ThreadPriorityVerbose, false, \
3472 "print priority changes") \
3473 \
3474 product(intx, DefaultThreadPriority, -1, \
3475 "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3476 \
3477 product(intx, CompilerThreadPriority, -1, \
3478 "what priority should compiler threads run at (-1 means no change)") \
3479 \
3480 product(intx, VMThreadPriority, -1, \
3481 "what priority should VM threads run at (-1 means no change)") \
3482 \
3483 product(bool, CompilerThreadHintNoPreempt, true, \
3484 "(Solaris only) Give compiler threads an extra quanta") \
3485 \
3486 product(bool, VMThreadHintNoPreempt, false, \
3487 "(Solaris only) Give VM thread an extra quanta") \
3488 \
3489 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3490 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3491 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3492 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3493 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3494 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3495 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3496 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3497 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3498 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3499 \
3500 /* compiler debugging */ \
3501 notproduct(intx, CompileTheWorldStartAt, 1, \
3502 "First class to consider when using +CompileTheWorld") \
3503 \
3504 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3505 "Last class to consider when using +CompileTheWorld") \
3506 \
3507 develop(intx, NewCodeParameter, 0, \
3508 "Testing Only: Create a dedicated integer parameter before " \
3509 "putback") \
3510 \
3511 /* new oopmap storage allocation */ \
3512 develop(intx, MinOopMapAllocation, 8, \
3513 "Minimum number of OopMap entries in an OopMapSet") \
3514 \
3515 /* Background Compilation */ \
3516 develop(intx, LongCompileThreshold, 50, \
3517 "Used with +TraceLongCompiles") \
3518 \
3519 product(intx, StarvationMonitorInterval, 200, \
3520 "Pause between each check in ms") \
3521 \
3522 /* recompilation */ \
3523 product_pd(intx, CompileThreshold, \
3524 "number of interpreted method invocations before (re-)compiling") \
3525 \
3526 product_pd(intx, BackEdgeThreshold, \
3527 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3528 \
3529 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3530 "Interpreter (tier 0) invocation notification frequency.") \
3531 \
3532 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3533 "C1 without MDO (tier 2) invocation notification frequency.") \
3534 \
3535 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3536 "C1 with MDO profiling (tier 3) invocation notification " \
3537 "frequency.") \
3538 \
3539 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3540 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3541 \
3542 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3543 "Interpreter (tier 0) invocation notification frequency.") \
3544 \
3545 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3546 "C1 without MDO (tier 2) invocation notification frequency.") \
3547 \
3548 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3549 "C1 with MDO profiling (tier 3) invocation notification " \
3550 "frequency.") \
3551 \
3552 product(intx, Tier2CompileThreshold, 0, \
3553 "threshold at which tier 2 compilation is invoked") \
3554 \
3555 product(intx, Tier2BackEdgeThreshold, 0, \
3556 "Back edge threshold at which tier 2 compilation is invoked") \
3557 \
3558 product(intx, Tier3InvocationThreshold, 200, \
3559 "Compile if number of method invocations crosses this " \
3560 "threshold") \
3561 \
3562 product(intx, Tier3MinInvocationThreshold, 100, \
3563 "Minimum invocation to compile at tier 3") \
3564 \
3565 product(intx, Tier3CompileThreshold, 2000, \
3566 "Threshold at which tier 3 compilation is invoked (invocation " \
3567 "minimum must be satisfied.") \
3568 \
3569 product(intx, Tier3BackEdgeThreshold, 7000, \
3570 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3571 \
3572 product(intx, Tier4InvocationThreshold, 5000, \
3573 "Compile if number of method invocations crosses this " \
3574 "threshold") \
3575 \
3576 product(intx, Tier4MinInvocationThreshold, 600, \
3577 "Minimum invocation to compile at tier 4") \
3578 \
3579 product(intx, Tier4CompileThreshold, 15000, \
3580 "Threshold at which tier 4 compilation is invoked (invocation " \
3581 "minimum must be satisfied.") \
3582 \
3583 product(intx, Tier4BackEdgeThreshold, 40000, \
3584 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3585 \
3586 product(intx, Tier3DelayOn, 5, \
3587 "If C2 queue size grows over this amount per compiler thread " \
3588 "stop compiling at tier 3 and start compiling at tier 2") \
3589 \
3590 product(intx, Tier3DelayOff, 2, \
3591 "If C2 queue size is less than this amount per compiler thread " \
3592 "allow methods compiled at tier 2 transition to tier 3") \
3593 \
3594 product(intx, Tier3LoadFeedback, 5, \
3595 "Tier 3 thresholds will increase twofold when C1 queue size " \
3596 "reaches this amount per compiler thread") \
3597 \
3598 product(intx, Tier4LoadFeedback, 3, \
3599 "Tier 4 thresholds will increase twofold when C2 queue size " \
3600 "reaches this amount per compiler thread") \
3601 \
3602 product(intx, TieredCompileTaskTimeout, 50, \
3603 "Kill compile task if method was not used within " \
3604 "given timeout in milliseconds") \
3605 \
3606 product(intx, TieredStopAtLevel, 4, \
3607 "Stop at given compilation level") \
3608 \
3609 product(intx, Tier0ProfilingStartPercentage, 200, \
3610 "Start profiling in interpreter if the counters exceed tier 3" \
3611 "thresholds by the specified percentage") \
3612 \
3613 product(intx, TieredRateUpdateMinTime, 1, \
3614 "Minimum rate sampling interval (in milliseconds)") \
3615 \
3616 product(intx, TieredRateUpdateMaxTime, 25, \
3617 "Maximum rate sampling interval (in milliseconds)") \
3618 \
3619 product_pd(bool, TieredCompilation, \
3620 "Enable tiered compilation") \
3621 \
3622 product(bool, PrintTieredEvents, false, \
3623 "Print tiered events notifications") \
3624 \
3625 product(bool, StressTieredRuntime, false, \
3626 "Alternate client and server compiler on compile requests") \
3627 \
3628 product_pd(intx, OnStackReplacePercentage, \
3629 "NON_TIERED number of method invocations/branches (expressed as %"\
3630 "of CompileThreshold) before (re-)compiling OSR code") \
3631 \
3632 product(intx, InterpreterProfilePercentage, 33, \
3633 "NON_TIERED number of method invocations/branches (expressed as %"\
3634 "of CompileThreshold) before profiling in the interpreter") \
3635 \
3636 develop(intx, MaxRecompilationSearchLength, 10, \
3637 "max. # frames to inspect searching for recompilee") \
3638 \
3639 develop(intx, MaxInterpretedSearchLength, 3, \
3640 "max. # interp. frames to skip when searching for recompilee") \
3641 \
3642 develop(intx, DesiredMethodLimit, 8000, \
3643 "desired max. method size (in bytecodes) after inlining") \
3644 \
3645 develop(intx, HugeMethodLimit, 8000, \
3646 "don't compile methods larger than this if " \
3647 "+DontCompileHugeMethods") \
3648 \
3649 /* New JDK 1.4 reflection implementation */ \
3650 \
3651 develop(bool, UseNewReflection, true, \
3652 "Temporary flag for transition to reflection based on dynamic " \
3653 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3654 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3655 "changes were needed") \
3656 \
3657 develop(bool, VerifyReflectionBytecodes, false, \
3658 "Force verification of 1.4 reflection bytecodes. Does not work " \
3659 "in situations like that described in 4486457 or for " \
3660 "constructors generated for serialization, so can not be enabled "\
3661 "in product.") \
3662 \
3663 product(bool, ReflectionWrapResolutionErrors, true, \
3664 "Temporary flag for transition to AbstractMethodError wrapped " \
3665 "in InvocationTargetException. See 6531596") \
3666 \
3667 \
3668 develop(intx, FastSuperclassLimit, 8, \
3669 "Depth of hardwired instanceof accelerator array") \
3670 \
3671 /* Properties for Java libraries */ \
3672 \
3673 product(intx, MaxDirectMemorySize, -1, \
3674 "Maximum total size of NIO direct-buffer allocations") \
3675 \
3676 /* temporary developer defined flags */ \
3677 \
3678 diagnostic(bool, UseNewCode, false, \
3679 "Testing Only: Use the new version while testing") \
3680 \
3681 diagnostic(bool, UseNewCode2, false, \
3682 "Testing Only: Use the new version while testing") \
3683 \
3684 diagnostic(bool, UseNewCode3, false, \
3685 "Testing Only: Use the new version while testing") \
3686 \
3687 /* flags for performance data collection */ \
3688 \
3689 product(bool, UsePerfData, falseInEmbedded, \
3690 "Flag to disable jvmstat instrumentation for performance testing" \
3691 "and problem isolation purposes.") \
3692 \
3693 product(bool, PerfDataSaveToFile, false, \
3694 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3695 \
3696 product(ccstr, PerfDataSaveFile, NULL, \
3697 "Save PerfData memory to the specified absolute pathname," \
3698 "%p in the file name if present will be replaced by pid") \
3699 \
3700 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3701 "Data sampling interval in milliseconds") \
3702 \
3703 develop(bool, PerfTraceDataCreation, false, \
3704 "Trace creation of Performance Data Entries") \
3705 \
3706 develop(bool, PerfTraceMemOps, false, \
3707 "Trace PerfMemory create/attach/detach calls") \
3708 \
3709 product(bool, PerfDisableSharedMem, false, \
3710 "Store performance data in standard memory") \
3711 \
3712 product(intx, PerfDataMemorySize, 32*K, \
3713 "Size of performance data memory region. Will be rounded " \
3714 "up to a multiple of the native os page size.") \
3715 \
3716 product(intx, PerfMaxStringConstLength, 1024, \
3717 "Maximum PerfStringConstant string length before truncation") \
3718 \
3719 product(bool, PerfAllowAtExitRegistration, false, \
3720 "Allow registration of atexit() methods") \
3721 \
3722 product(bool, PerfBypassFileSystemCheck, false, \
3723 "Bypass Win32 file system criteria checks (Windows Only)") \
3724 \
3725 product(intx, UnguardOnExecutionViolation, 0, \
3726 "Unguard page and retry on no-execute fault (Win32 only)" \
3727 "0=off, 1=conservative, 2=aggressive") \
3728 \
3729 /* Serviceability Support */ \
3730 \
3731 product(bool, ManagementServer, false, \
3732 "Create JMX Management Server") \
3733 \
3734 product(bool, DisableAttachMechanism, false, \
3735 "Disable mechanism that allows tools to attach to this VM") \
3736 \
3737 product(bool, StartAttachListener, false, \
3738 "Always start Attach Listener at VM startup") \
3739 \
3740 manageable(bool, PrintConcurrentLocks, false, \
3741 "Print java.util.concurrent locks in thread dump") \
3742 \
3743 product(bool, TransmitErrorReport, false, \
3744 "Enable error report transmission on erroneous termination") \
3745 \
3746 product(ccstr, ErrorReportServer, NULL, \
3747 "Override built-in error report server address") \
3748 \
3749 /* Shared spaces */ \
3750 \
3751 product(bool, UseSharedSpaces, true, \
3752 "Use shared spaces in the permanent generation") \
3753 \
3754 product(bool, RequireSharedSpaces, false, \
3755 "Require shared spaces in the permanent generation") \
3756 \
3757 product(bool, DumpSharedSpaces, false, \
3758 "Special mode: JVM reads a class list, loads classes, builds " \
3759 "shared spaces, and dumps the shared spaces to a file to be " \
3760 "used in future JVM runs.") \
3761 \
3762 product(bool, PrintSharedSpaces, false, \
3763 "Print usage of shared spaces") \
3764 \
3765 product(uintx, SharedDummyBlockSize, 512*M, \
3766 "Size of dummy block used to shift heap addresses (in bytes)") \
3767 \
3768 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \
3769 "Size of read-write space in permanent generation (in bytes)") \
3770 \
3771 product(uintx, SharedReadOnlySize, 10*M, \
3772 "Size of read-only space in permanent generation (in bytes)") \
3773 \
3774 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \
3775 "Size of the shared data area adjacent to the heap (in bytes)") \
3776 \
3777 product(uintx, SharedMiscCodeSize, 4*M, \
3778 "Size of the shared code area adjacent to the heap (in bytes)") \
3779 \
3780 diagnostic(bool, SharedOptimizeColdStart, true, \
3781 "At dump time, order shared objects to achieve better " \
3782 "cold startup time.") \
3783 \
3784 develop(intx, SharedOptimizeColdStartPolicy, 2, \
3785 "Reordering policy for SharedOptimizeColdStart " \
3786 "0=favor classload-time locality, 1=balanced, " \
3787 "2=favor runtime locality") \
3788 \
3789 diagnostic(bool, SharedSkipVerify, false, \
3790 "Skip assert() and verify() which page-in unwanted shared " \
3791 "objects. ") \
3792 \
3793 diagnostic(bool, EnableInvokeDynamic, true, \
3794 "support JSR 292 (method handles, invokedynamic, " \
3795 "anonymous classes") \
3796 \
3797 product(bool, AnonymousClasses, false, \
3798 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \
3799 \
3800 experimental(bool, EnableMethodHandles, false, \
3801 "support method handles (deprecated)") \
3802 \
3803 diagnostic(intx, MethodHandlePushLimit, 3, \
3804 "number of additional stack slots a method handle may push") \
3805 \
3806 diagnostic(bool, PrintMethodHandleStubs, false, \
3807 "Print generated stub code for method handles") \
3808 \
3809 develop(bool, TraceMethodHandles, false, \
3810 "trace internal method handle operations") \
3811 \
3812 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3813 "perform extra checks when constructing method handles") \
3814 \
3815 diagnostic(bool, OptimizeMethodHandles, true, \
3816 "when constructing method handles, try to improve them") \
3817 \
3818 develop(bool, StressMethodHandleWalk, false, \
3819 "Process all method handles with MethodHandleWalk") \
3820 \
3821 diagnostic(bool, UseRicochetFrames, true, \
3822 "use ricochet stack frames for method handle combination, " \
3823 "if the platform supports them") \
3824 \
3825 experimental(bool, TrustFinalNonStaticFields, false, \
3826 "trust final non-static declarations for constant folding") \
3827 \
3828 experimental(bool, AllowInvokeGeneric, false, \
3829 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \
3830 "as equivalent methods") \
3831 \
3832 develop(bool, TraceInvokeDynamic, false, \
3833 "trace internal invoke dynamic operations") \
3834 \
3835 diagnostic(bool, PauseAtStartup, false, \
3836 "Causes the VM to pause at startup time and wait for the pause " \
3837 "file to be removed (default: ./vm.paused.<pid>)") \
3838 \
3839 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3840 "The file to create and for whose removal to await when pausing " \
3841 "at startup. (default: ./vm.paused.<pid>)") \
3842 \
3843 diagnostic(bool, PauseAtExit, false, \
3844 "Pause and wait for keypress on exit if a debugger is attached") \
3845 \
3846 product(bool, ExtendedDTraceProbes, false, \
3847 "Enable performance-impacting dtrace probes") \
3848 \
3849 product(bool, DTraceMethodProbes, false, \
3850 "Enable dtrace probes for method-entry and method-exit") \
3851 \
3852 product(bool, DTraceAllocProbes, false, \
3853 "Enable dtrace probes for object allocation") \
3854 \
3855 product(bool, DTraceMonitorProbes, false, \
3856 "Enable dtrace probes for monitor events") \
3857 \
3858 product(bool, RelaxAccessControlCheck, false, \
3859 "Relax the access control checks in the verifier") \
3860 \
3861 diagnostic(bool, PrintDTraceDOF, false, \
3862 "Print the DTrace DOF passed to the system for JSDT probes") \
3863 \
3864 product(uintx, StringTableSize, 1009, \
3865 "Number of buckets in the interned String table") \
3866 \
3867 product(bool, UseVMInterruptibleIO, false, \
3868 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3869 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3870 " of this flag is true for JDK 6 and earliers")
3872 /*
3873 * Macros for factoring of globals
3874 */
3876 // Interface macros
3877 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3878 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3879 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3880 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3881 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3882 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3883 #ifdef PRODUCT
3884 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
3885 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
3886 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3887 #else
3888 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3889 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3890 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3891 #endif
3892 // Special LP64 flags, product only needed for now.
3893 #ifdef _LP64
3894 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3895 #else
3896 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3897 #endif // _LP64
3899 // Implementation macros
3900 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3901 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3902 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3903 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3904 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3905 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3906 #ifdef PRODUCT
3907 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3908 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */
3909 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3910 #else
3911 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3912 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3913 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3914 #endif
3915 #ifdef _LP64
3916 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3917 #else
3918 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3919 #endif // _LP64
3921 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)
3923 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3925 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP