1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/debug.hpp"
29
30 // use this for flags that are true per default in the tiered build
31 // but false in non-tiered builds, and vice versa
32 #ifdef TIERED
33 #define trueInTiered true
34 #define falseInTiered false
35 #else
36 #define trueInTiered false
37 #define falseInTiered true
38 #endif
39
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_ARCH_aarch64
56 # include "globals_aarch64.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_linux
59 # include "globals_linux.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_solaris
62 # include "globals_solaris.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_windows
65 # include "globals_windows.hpp"
66 #endif
67 #ifdef TARGET_OS_FAMILY_aix
68 # include "globals_aix.hpp"
69 #endif
70 #ifdef TARGET_OS_FAMILY_bsd
71 # include "globals_bsd.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_x86
74 # include "globals_linux_x86.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_linux_sparc
77 # include "globals_linux_sparc.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_linux_zero
80 # include "globals_linux_zero.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_solaris_x86
83 # include "globals_solaris_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_solaris_sparc
86 # include "globals_solaris_sparc.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_windows_x86
89 # include "globals_windows_x86.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_linux_arm
92 # include "globals_linux_arm.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_linux_ppc
95 # include "globals_linux_ppc.hpp"
96 #endif
97 #ifdef TARGET_OS_ARCH_linux_aarch64
98 # include "globals_linux_aarch64.hpp"
99 #endif
100 #ifdef TARGET_OS_ARCH_aix_ppc
101 # include "globals_aix_ppc.hpp"
102 #endif
103 #ifdef TARGET_OS_ARCH_bsd_x86
104 # include "globals_bsd_x86.hpp"
105 #endif
106 #ifdef TARGET_OS_ARCH_bsd_zero
107 # include "globals_bsd_zero.hpp"
108 #endif
109 #ifdef COMPILER1
110 #ifdef TARGET_ARCH_x86
111 # include "c1_globals_x86.hpp"
112 #endif
113 #ifdef TARGET_ARCH_sparc
114 # include "c1_globals_sparc.hpp"
115 #endif
116 #ifdef TARGET_ARCH_arm
117 # include "c1_globals_arm.hpp"
118 #endif
119 #ifdef TARGET_ARCH_aarch64
120 # include "c1_globals_aarch64.hpp"
121 #endif
122 #ifdef TARGET_OS_FAMILY_linux
123 # include "c1_globals_linux.hpp"
124 #endif
125 #ifdef TARGET_OS_FAMILY_solaris
126 # include "c1_globals_solaris.hpp"
127 #endif
128 #ifdef TARGET_OS_FAMILY_windows
129 # include "c1_globals_windows.hpp"
130 #endif
131 #ifdef TARGET_OS_FAMILY_aix
132 # include "c1_globals_aix.hpp"
133 #endif
134 #ifdef TARGET_OS_FAMILY_bsd
135 # include "c1_globals_bsd.hpp"
136 #endif
137 #ifdef TARGET_ARCH_ppc
138 # include "c1_globals_ppc.hpp"
139 #endif
140 #endif
141 #ifdef COMPILER2
142 #ifdef TARGET_ARCH_x86
143 # include "c2_globals_x86.hpp"
144 #endif
145 #ifdef TARGET_ARCH_sparc
146 # include "c2_globals_sparc.hpp"
147 #endif
148 #ifdef TARGET_ARCH_arm
149 # include "c2_globals_arm.hpp"
150 #endif
151 #ifdef TARGET_ARCH_ppc
152 # include "c2_globals_ppc.hpp"
153 #endif
154 #ifdef TARGET_ARCH_aarch64
155 # include "c2_globals_aarch64.hpp"
156 #endif
157 #ifdef TARGET_OS_FAMILY_linux
158 # include "c2_globals_linux.hpp"
159 #endif
160 #ifdef TARGET_OS_FAMILY_solaris
161 # include "c2_globals_solaris.hpp"
162 #endif
163 #ifdef TARGET_OS_FAMILY_windows
164 # include "c2_globals_windows.hpp"
165 #endif
166 #ifdef TARGET_OS_FAMILY_aix
167 # include "c2_globals_aix.hpp"
168 #endif
169 #ifdef TARGET_OS_FAMILY_bsd
170 # include "c2_globals_bsd.hpp"
171 #endif
172 #endif
173 #ifdef SHARK
174 #ifdef TARGET_ARCH_zero
175 # include "shark_globals_zero.hpp"
176 #endif
177 #endif
178
179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
180 define_pd_global(bool, BackgroundCompilation, false);
181 define_pd_global(bool, UseTLAB, false);
182 define_pd_global(bool, CICompileOSR, false);
183 define_pd_global(bool, UseTypeProfile, false);
184 define_pd_global(bool, UseOnStackReplacement, false);
185 define_pd_global(bool, InlineIntrinsics, false);
186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
187 define_pd_global(bool, ProfileInterpreter, false);
188 define_pd_global(bool, ProfileTraps, false);
189 define_pd_global(bool, TieredCompilation, false);
190
191 define_pd_global(intx, CompileThreshold, 0);
192
193 define_pd_global(intx, OnStackReplacePercentage, 0);
194 define_pd_global(bool, ResizeTLAB, false);
195 define_pd_global(intx, FreqInlineSize, 0);
196 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
197 define_pd_global(intx, InlineClassNatives, true);
198 define_pd_global(intx, InlineUnsafeOps, true);
199 define_pd_global(intx, InitialCodeCacheSize, 160*K);
200 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
201 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
202 define_pd_global(intx, ProfiledCodeHeapSize, 0);
203 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
204
205 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
206 define_pd_global(intx, CodeCacheMinBlockLength, 1);
207 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
208 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
209 define_pd_global(bool, NeverActAsServerClassMachine, true);
210 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
211 #define CI_COMPILER_COUNT 0
212 #else
213
214 #ifdef COMPILER2
215 #define CI_COMPILER_COUNT 2
216 #else
217 #define CI_COMPILER_COUNT 1
218 #endif // COMPILER2
219
220 #endif // no compilers
221
222 // string type aliases used only in this file
223 typedef const char* ccstr;
224 typedef const char* ccstrlist; // represents string arguments which accumulate
225
226 struct Flag {
227 enum Flags {
228 // value origin
229 DEFAULT = 0,
230 COMMAND_LINE = 1,
231 ENVIRON_VAR = 2,
232 CONFIG_FILE = 3,
233 MANAGEMENT = 4,
234 ERGONOMIC = 5,
235 ATTACH_ON_DEMAND = 6,
236 INTERNAL = 7,
237
238 LAST_VALUE_ORIGIN = INTERNAL,
239 VALUE_ORIGIN_BITS = 4,
240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
241
242 // flag kind
243 KIND_PRODUCT = 1 << 4,
244 KIND_MANAGEABLE = 1 << 5,
245 KIND_DIAGNOSTIC = 1 << 6,
246 KIND_EXPERIMENTAL = 1 << 7,
247 KIND_NOT_PRODUCT = 1 << 8,
248 KIND_DEVELOP = 1 << 9,
249 KIND_PLATFORM_DEPENDENT = 1 << 10,
250 KIND_READ_WRITE = 1 << 11,
251 KIND_C1 = 1 << 12,
252 KIND_C2 = 1 << 13,
253 KIND_ARCH = 1 << 14,
254 KIND_SHARK = 1 << 15,
255 KIND_LP64_PRODUCT = 1 << 16,
256 KIND_COMMERCIAL = 1 << 17,
257
258 KIND_MASK = ~VALUE_ORIGIN_MASK
259 };
260
261 enum Error {
262 // no error
263 SUCCESS = 0,
264 // flag name is missing
265 MISSING_NAME,
266 // flag value is missing
267 MISSING_VALUE,
268 // error parsing the textual form of the value
269 WRONG_FORMAT,
270 // flag is not writeable
271 NON_WRITABLE,
272 // flag value is outside of its bounds
273 OUT_OF_BOUNDS,
274 // flag value violates its constraint
275 VIOLATES_CONSTRAINT,
276 // there is no flag with the given name
277 INVALID_FLAG,
278 // other, unspecified error related to setting the flag
279 ERR_OTHER
280 };
281
282 enum MsgType {
283 NONE = 0,
284 DIAGNOSTIC_FLAG_BUT_LOCKED,
285 EXPERIMENTAL_FLAG_BUT_LOCKED,
286 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
287 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
288 };
289
290 const char* _type;
291 const char* _name;
292 void* _addr;
293 NOT_PRODUCT(const char* _doc;)
294 Flags _flags;
295
296 // points to all Flags static array
297 static Flag* flags;
298
299 // number of flags
300 static size_t numFlags;
301
302 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
303 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
304 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
305
306 void check_writable();
307
308 bool is_bool() const;
309 bool get_bool() const;
310 void set_bool(bool value);
311
312 bool is_int() const;
313 int get_int() const;
314 void set_int(int value);
315
316 bool is_uint() const;
317 uint get_uint() const;
318 void set_uint(uint value);
319
320 bool is_intx() const;
321 intx get_intx() const;
322 void set_intx(intx value);
323
324 bool is_uintx() const;
325 uintx get_uintx() const;
326 void set_uintx(uintx value);
327
328 bool is_uint64_t() const;
329 uint64_t get_uint64_t() const;
330 void set_uint64_t(uint64_t value);
331
332 bool is_size_t() const;
333 size_t get_size_t() const;
334 void set_size_t(size_t value);
335
336 bool is_double() const;
337 double get_double() const;
338 void set_double(double value);
339
340 bool is_ccstr() const;
341 bool ccstr_accumulates() const;
342 ccstr get_ccstr() const;
343 void set_ccstr(ccstr value);
344
345 Flags get_origin();
346 void set_origin(Flags origin);
347
348 bool is_default();
349 bool is_ergonomic();
350 bool is_command_line();
351
352 bool is_product() const;
353 bool is_manageable() const;
354 bool is_diagnostic() const;
355 bool is_experimental() const;
356 bool is_notproduct() const;
357 bool is_develop() const;
358 bool is_read_write() const;
359 bool is_commercial() const;
360
361 bool is_constant_in_binary() const;
362
363 bool is_unlocker() const;
364 bool is_unlocked() const;
365 bool is_writeable() const;
366 bool is_external() const;
367
368 bool is_unlocker_ext() const;
369 bool is_unlocked_ext() const;
370 bool is_writeable_ext() const;
371 bool is_external_ext() const;
372
373 void unlock_diagnostic();
374
375 Flag::MsgType get_locked_message(char*, int) const;
376 void get_locked_message_ext(char*, int) const;
377
378 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
379 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
380 void print_kind(outputStream* st);
381 void print_as_flag(outputStream* st);
382
383 static const char* flag_error_str(Flag::Error error);
384 };
385
386 // debug flags control various aspects of the VM and are global accessible
387
388 // use FlagSetting to temporarily change some debug flag
389 // e.g. FlagSetting fs(DebugThisAndThat, true);
390 // restored to previous value upon leaving scope
391 class FlagSetting {
392 bool val;
393 bool* flag;
394 public:
395 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
396 ~FlagSetting() { *flag = val; }
397 };
398
399
400 class CounterSetting {
401 intx* counter;
402 public:
403 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
404 ~CounterSetting() { (*counter)--; }
405 };
406
407 class IntFlagSetting {
408 int val;
409 int* flag;
410 public:
411 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
412 ~IntFlagSetting() { *flag = val; }
413 };
414
415 class UIntFlagSetting {
416 uint val;
417 uint* flag;
418 public:
419 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
420 ~UIntFlagSetting() { *flag = val; }
421 };
422
423 class UIntXFlagSetting {
424 uintx val;
425 uintx* flag;
426 public:
427 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
428 ~UIntXFlagSetting() { *flag = val; }
429 };
430
431 class DoubleFlagSetting {
432 double val;
433 double* flag;
434 public:
435 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
436 ~DoubleFlagSetting() { *flag = val; }
437 };
438
439 class SizeTFlagSetting {
440 size_t val;
441 size_t* flag;
442 public:
443 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
444 ~SizeTFlagSetting() { *flag = val; }
445 };
446
447
448 class CommandLineFlags {
449 public:
450 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
451 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
452 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
453 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
454
455 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
456 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); }
457 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
458 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
459
460 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
461 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
462 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
463 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
464
465 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
466 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
467 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
468 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
469
470 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
471 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
472 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
473 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
474
475 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
476 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
477 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
478 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
479
480 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
481 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
482 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
483 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
484
485 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
486 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
487 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
488 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
489
490 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
491 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
492 // Contract: Flag will make private copy of the incoming value.
493 // Outgoing value is always malloc-ed, and caller MUST call free.
494 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
495 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
496
497 // Returns false if name is not a command line flag.
498 static bool wasSetOnCmdline(const char* name, bool* value);
499 static void printSetFlags(outputStream* out);
500
501 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
502 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
503
504 static void verify() PRODUCT_RETURN;
505 };
506
507 // use this for flags that are true by default in the debug version but
508 // false in the optimized version, and vice versa
509 #ifdef ASSERT
510 #define trueInDebug true
511 #define falseInDebug false
512 #else
513 #define trueInDebug false
514 #define falseInDebug true
515 #endif
516
517 // use this for flags that are true per default in the product build
518 // but false in development builds, and vice versa
519 #ifdef PRODUCT
520 #define trueInProduct true
521 #define falseInProduct false
522 #else
523 #define trueInProduct false
524 #define falseInProduct true
525 #endif
526
527 #ifdef JAVASE_EMBEDDED
528 #define falseInEmbedded false
529 #else
530 #define falseInEmbedded true
531 #endif
532
533 // develop flags are settable / visible only during development and are constant in the PRODUCT version
534 // product flags are always settable / visible
535 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
536
537 // A flag must be declared with one of the following types:
538 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
539 // The type "ccstr" is an alias for "const char*" and is used
540 // only in this file, because the macrology requires single-token type names.
541
542 // Note: Diagnostic options not meant for VM tuning or for product modes.
543 // They are to be used for VM quality assurance or field diagnosis
544 // of VM bugs. They are hidden so that users will not be encouraged to
545 // try them as if they were VM ordinary execution options. However, they
546 // are available in the product version of the VM. Under instruction
547 // from support engineers, VM customers can turn them on to collect
548 // diagnostic information about VM problems. To use a VM diagnostic
549 // option, you must first specify +UnlockDiagnosticVMOptions.
550 // (This master switch also affects the behavior of -Xprintflags.)
551 //
552 // experimental flags are in support of features that are not
553 // part of the officially supported product, but are available
554 // for experimenting with. They could, for example, be performance
555 // features that may not have undergone full or rigorous QA, but which may
556 // help performance in some cases and released for experimentation
557 // by the community of users and developers. This flag also allows one to
558 // be able to build a fully supported product that nonetheless also
559 // ships with some unsupported, lightly tested, experimental features.
560 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
561 // UnlockExperimentalVMOptions flag, which allows the control and
562 // modification of the experimental flags.
563 //
564 // Nota bene: neither diagnostic nor experimental options should be used casually,
565 // and they are not supported on production loads, except under explicit
566 // direction from support engineers.
567 //
568 // manageable flags are writeable external product flags.
569 // They are dynamically writeable through the JDK management interface
570 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
571 // These flags are external exported interface (see CCC). The list of
572 // manageable flags can be queried programmatically through the management
573 // interface.
574 //
575 // A flag can be made as "manageable" only if
576 // - the flag is defined in a CCC as an external exported interface.
577 // - the VM implementation supports dynamic setting of the flag.
578 // This implies that the VM must *always* query the flag variable
579 // and not reuse state related to the flag state at any given time.
580 // - you want the flag to be queried programmatically by the customers.
581 //
582 // product_rw flags are writeable internal product flags.
583 // They are like "manageable" flags but for internal/private use.
584 // The list of product_rw flags are internal/private flags which
585 // may be changed/removed in a future release. It can be set
586 // through the management interface to get/set value
587 // when the name of flag is supplied.
588 //
589 // A flag can be made as "product_rw" only if
590 // - the VM implementation supports dynamic setting of the flag.
591 // This implies that the VM must *always* query the flag variable
592 // and not reuse state related to the flag state at any given time.
593 //
594 // Note that when there is a need to support develop flags to be writeable,
595 // it can be done in the same way as product_rw.
596 //
597 // range is a macro that will expand to min and max arguments for range
598 // checking code if provided - see commandLineFlagRangeList.hpp
599 //
600 // constraint is a macro that will expand to custom function call
601 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
602 //
603
604 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
605 \
606 lp64_product(bool, UseCompressedOops, false, \
607 "Use 32-bit object references in 64-bit VM. " \
608 "lp64_product means flag is always constant in 32 bit VM") \
609 \
610 lp64_product(bool, UseCompressedClassPointers, false, \
611 "Use 32-bit class pointers in 64-bit VM. " \
612 "lp64_product means flag is always constant in 32 bit VM") \
613 \
614 notproduct(bool, CheckCompressedOops, true, \
615 "Generate checks in encoding/decoding code in debug VM") \
616 \
617 product_pd(size_t, HeapBaseMinAddress, \
618 "OS specific low limit for heap base address") \
619 \
620 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
621 "Heap allocation steps through preferred address regions to find" \
622 " where it can allocate the heap. Number of steps to take per " \
623 "region.") \
624 range(1, max_uintx) \
625 \
626 diagnostic(bool, PrintCompressedOopsMode, false, \
627 "Print compressed oops base address and encoding mode") \
628 \
629 lp64_product(intx, ObjectAlignmentInBytes, 8, \
630 "Default object alignment in bytes, 8 is minimum") \
631 range(8, 256) \
632 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
633 \
634 product(bool, AssumeMP, false, \
635 "Instruct the VM to assume multiple processors are available") \
636 \
637 /* UseMembar is theoretically a temp flag used for memory barrier */ \
638 /* removal testing. It was supposed to be removed before FCS but has */ \
639 /* been re-added (see 6401008) */ \
640 product_pd(bool, UseMembar, \
641 "(Unstable) Issues membars on thread state transitions") \
642 \
643 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
644 "Clean the chunk pool asynchronously") \
645 \
646 experimental(bool, AlwaysSafeConstructors, false, \
647 "Force safe construction, as if all fields are final.") \
648 \
649 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
650 "Enable normal processing of flags relating to field diagnostics")\
651 \
652 experimental(bool, UnlockExperimentalVMOptions, false, \
653 "Enable normal processing of flags relating to experimental " \
654 "features") \
655 \
656 product(bool, JavaMonitorsInStackTrace, true, \
657 "Print information about Java monitor locks when the stacks are" \
658 "dumped") \
659 \
660 product_pd(bool, UseLargePages, \
661 "Use large page memory") \
662 \
663 product_pd(bool, UseLargePagesIndividualAllocation, \
664 "Allocate large pages individually for better affinity") \
665 \
666 develop(bool, LargePagesIndividualAllocationInjectError, false, \
667 "Fail large pages individual allocation") \
668 \
669 product(bool, UseLargePagesInMetaspace, false, \
670 "Use large page memory in metaspace. " \
671 "Only used if UseLargePages is enabled.") \
672 \
673 develop(bool, TracePageSizes, false, \
674 "Trace page size selection and usage") \
675 \
676 product(bool, UseNUMA, false, \
677 "Use NUMA if available") \
678 \
679 product(bool, UseNUMAInterleaving, false, \
680 "Interleave memory across NUMA nodes if available") \
681 \
682 product(size_t, NUMAInterleaveGranularity, 2*M, \
683 "Granularity to use for NUMA interleaving on Windows OS") \
684 \
685 product(bool, ForceNUMA, false, \
686 "Force NUMA optimizations on single-node/UMA systems") \
687 \
688 product(uintx, NUMAChunkResizeWeight, 20, \
689 "Percentage (0-100) used to weight the current sample when " \
690 "computing exponentially decaying average for " \
691 "AdaptiveNUMAChunkSizing") \
692 range(0, 100) \
693 \
694 product(size_t, NUMASpaceResizeRate, 1*G, \
695 "Do not reallocate more than this amount per collection") \
696 \
697 product(bool, UseAdaptiveNUMAChunkSizing, true, \
698 "Enable adaptive chunk sizing for NUMA") \
699 \
700 product(bool, NUMAStats, false, \
701 "Print NUMA stats in detailed heap information") \
702 \
703 product(uintx, NUMAPageScanRate, 256, \
704 "Maximum number of pages to include in the page scan procedure") \
705 \
706 product_pd(bool, NeedsDeoptSuspend, \
707 "True for register window machines (sparc/ia64)") \
708 \
709 product(intx, UseSSE, 99, \
710 "Highest supported SSE instructions set on x86/x64") \
711 \
712 product(bool, UseAES, false, \
713 "Control whether AES instructions can be used on x86/x64") \
714 \
715 product(bool, UseSHA, false, \
716 "Control whether SHA instructions can be used " \
717 "on SPARC and on ARM") \
718 \
719 product(bool, UseGHASHIntrinsics, false, \
720 "Use intrinsics for GHASH versions of crypto") \
721 \
722 product(size_t, LargePageSizeInBytes, 0, \
723 "Large page size (0 to let VM choose the page size)") \
724 \
725 product(size_t, LargePageHeapSizeThreshold, 128*M, \
726 "Use large pages if maximum heap is at least this big") \
727 \
728 product(bool, ForceTimeHighResolution, false, \
729 "Using high time resolution (for Win32 only)") \
730 \
731 develop(bool, TraceItables, false, \
732 "Trace initialization and use of itables") \
733 \
734 develop(bool, TracePcPatching, false, \
735 "Trace usage of frame::patch_pc") \
736 \
737 develop(bool, TraceJumps, false, \
738 "Trace assembly jumps in thread ring buffer") \
739 \
740 develop(bool, TraceRelocator, false, \
741 "Trace the bytecode relocator") \
742 \
743 develop(bool, TraceLongCompiles, false, \
744 "Print out every time compilation is longer than " \
745 "a given threshold") \
746 \
747 develop(bool, SafepointALot, false, \
748 "Generate a lot of safepoints. This works with " \
749 "GuaranteedSafepointInterval") \
750 \
751 product_pd(bool, BackgroundCompilation, \
752 "A thread requesting compilation is not blocked during " \
753 "compilation") \
754 \
755 product(bool, PrintVMQWaitTime, false, \
756 "Print out the waiting time in VM operation queue") \
757 \
758 develop(bool, TraceOopMapGeneration, false, \
759 "Show OopMapGeneration") \
760 \
761 product(bool, MethodFlushing, true, \
762 "Reclamation of zombie and not-entrant methods") \
763 \
764 develop(bool, VerifyStack, false, \
765 "Verify stack of each thread when it is entering a runtime call") \
766 \
767 diagnostic(bool, ForceUnreachable, false, \
768 "Make all non code cache addresses to be unreachable by " \
769 "forcing use of 64bit literal fixups") \
770 \
771 notproduct(bool, StressDerivedPointers, false, \
772 "Force scavenge when a derived pointer is detected on stack " \
773 "after rtm call") \
774 \
775 develop(bool, TraceDerivedPointers, false, \
776 "Trace traversal of derived pointers on stack") \
777 \
778 notproduct(bool, TraceCodeBlobStacks, false, \
779 "Trace stack-walk of codeblobs") \
780 \
781 product(bool, PrintJNIResolving, false, \
782 "Used to implement -v:jni") \
783 \
784 notproduct(bool, PrintRewrites, false, \
785 "Print methods that are being rewritten") \
786 \
787 product(bool, UseInlineCaches, true, \
788 "Use Inline Caches for virtual calls ") \
789 \
790 develop(bool, InlineArrayCopy, true, \
791 "Inline arraycopy native that is known to be part of " \
792 "base library DLL") \
793 \
794 develop(bool, InlineObjectHash, true, \
795 "Inline Object::hashCode() native that is known to be part " \
796 "of base library DLL") \
797 \
798 develop(bool, InlineNatives, true, \
799 "Inline natives that are known to be part of base library DLL") \
800 \
801 develop(bool, InlineMathNatives, true, \
802 "Inline SinD, CosD, etc.") \
803 \
804 develop(bool, InlineClassNatives, true, \
805 "Inline Class.isInstance, etc") \
806 \
807 develop(bool, InlineThreadNatives, true, \
808 "Inline Thread.currentThread, etc") \
809 \
810 develop(bool, InlineUnsafeOps, true, \
811 "Inline memory ops (native methods) from sun.misc.Unsafe") \
812 \
813 product(bool, CriticalJNINatives, true, \
814 "Check for critical JNI entry points") \
815 \
816 notproduct(bool, StressCriticalJNINatives, false, \
817 "Exercise register saving code in critical natives") \
818 \
819 product(bool, UseSSE42Intrinsics, false, \
820 "SSE4.2 versions of intrinsics") \
821 \
822 product(bool, UseAESIntrinsics, false, \
823 "Use intrinsics for AES versions of crypto") \
824 \
825 product(bool, UseSHA1Intrinsics, false, \
826 "Use intrinsics for SHA-1 crypto hash function. " \
827 "Requires that UseSHA is enabled.") \
828 \
829 product(bool, UseSHA256Intrinsics, false, \
830 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
831 "Requires that UseSHA is enabled.") \
832 \
833 product(bool, UseSHA512Intrinsics, false, \
834 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
835 "Requires that UseSHA is enabled.") \
836 \
837 product(bool, UseCRC32Intrinsics, false, \
838 "use intrinsics for java.util.zip.CRC32") \
839 \
840 product(bool, UseCRC32CIntrinsics, false, \
841 "use intrinsics for java.util.zip.CRC32C") \
842 \
843 product(bool, UseAdler32Intrinsics, false, \
844 "use intrinsics for java.util.zip.Adler32") \
845 \
846 diagnostic(ccstrlist, DisableIntrinsic, "", \
847 "do not expand intrinsics whose (internal) names appear here") \
848 \
849 develop(bool, TraceCallFixup, false, \
850 "Trace all call fixups") \
851 \
852 develop(bool, DeoptimizeALot, false, \
853 "Deoptimize at every exit from the runtime system") \
854 \
855 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
856 "A comma separated list of bcis to deoptimize at") \
857 \
858 product(bool, DeoptimizeRandom, false, \
859 "Deoptimize random frames on random exit from the runtime system")\
860 \
861 notproduct(bool, ZombieALot, false, \
862 "Create zombies (non-entrant) at exit from the runtime system") \
863 \
864 product(bool, UnlinkSymbolsALot, false, \
865 "Unlink unreferenced symbols from the symbol table at safepoints")\
866 \
867 notproduct(bool, WalkStackALot, false, \
868 "Trace stack (no print) at every exit from the runtime system") \
869 \
870 product(bool, Debugging, false, \
871 "Set when executing debug methods in debug.cpp " \
872 "(to prevent triggering assertions)") \
873 \
874 notproduct(bool, StrictSafepointChecks, trueInDebug, \
875 "Enable strict checks that safepoints cannot happen for threads " \
876 "that use No_Safepoint_Verifier") \
877 \
878 notproduct(bool, VerifyLastFrame, false, \
879 "Verify oops on last frame on entry to VM") \
880 \
881 develop(bool, TraceHandleAllocation, false, \
882 "Print out warnings when suspiciously many handles are allocated")\
883 \
884 product(bool, FailOverToOldVerifier, true, \
885 "Fail over to old verifier when split verifier fails") \
886 \
887 develop(bool, ShowSafepointMsgs, false, \
888 "Show message about safepoint synchronization") \
889 \
890 product(bool, SafepointTimeout, false, \
891 "Time out and warn or fail after SafepointTimeoutDelay " \
892 "milliseconds if failed to reach safepoint") \
893 \
894 develop(bool, DieOnSafepointTimeout, false, \
895 "Die upon failure to reach safepoint (see SafepointTimeout)") \
896 \
897 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
898 /* typically, at most a few retries are needed */ \
899 product(intx, SuspendRetryCount, 50, \
900 "Maximum retry count for an external suspend request") \
901 \
902 product(intx, SuspendRetryDelay, 5, \
903 "Milliseconds to delay per retry (* current_retry_count)") \
904 \
905 product(bool, AssertOnSuspendWaitFailure, false, \
906 "Assert/Guarantee on external suspend wait failure") \
907 \
908 product(bool, TraceSuspendWaitFailures, false, \
909 "Trace external suspend wait failures") \
910 \
911 product(bool, MaxFDLimit, true, \
912 "Bump the number of file descriptors to maximum in Solaris") \
913 \
914 diagnostic(bool, LogEvents, true, \
915 "Enable the various ring buffer event logs") \
916 \
917 diagnostic(uintx, LogEventsBufferEntries, 10, \
918 "Number of ring buffer event logs") \
919 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
920 \
921 product(bool, BytecodeVerificationRemote, true, \
922 "Enable the Java bytecode verifier for remote classes") \
923 \
924 product(bool, BytecodeVerificationLocal, false, \
925 "Enable the Java bytecode verifier for local classes") \
926 \
927 develop(bool, ForceFloatExceptions, trueInDebug, \
928 "Force exceptions on FP stack under/overflow") \
929 \
930 develop(bool, VerifyStackAtCalls, false, \
931 "Verify that the stack pointer is unchanged after calls") \
932 \
933 develop(bool, TraceJavaAssertions, false, \
934 "Trace java language assertions") \
935 \
936 notproduct(bool, CheckAssertionStatusDirectives, false, \
937 "Temporary - see javaClasses.cpp") \
938 \
939 notproduct(bool, PrintMallocFree, false, \
940 "Trace calls to C heap malloc/free allocation") \
941 \
942 product(bool, PrintOopAddress, false, \
943 "Always print the location of the oop") \
944 \
945 notproduct(bool, VerifyCodeCache, false, \
946 "Verify code cache on memory allocation/deallocation") \
947 \
948 develop(bool, ZapDeadCompiledLocals, false, \
949 "Zap dead locals in compiler frames") \
950 \
951 notproduct(bool, ZapDeadLocalsOld, false, \
952 "Zap dead locals (old version, zaps all frames when " \
953 "entering the VM") \
954 \
955 notproduct(bool, CheckOopishValues, false, \
956 "Warn if value contains oop (requires ZapDeadLocals)") \
957 \
958 develop(bool, UseMallocOnly, false, \
959 "Use only malloc/free for allocation (no resource area/arena)") \
960 \
961 develop(bool, PrintMalloc, false, \
962 "Print all malloc/free calls") \
963 \
964 develop(bool, PrintMallocStatistics, false, \
965 "Print malloc/free statistics") \
966 \
967 develop(bool, ZapResourceArea, trueInDebug, \
968 "Zap freed resource/arena space with 0xABABABAB") \
969 \
970 notproduct(bool, ZapVMHandleArea, trueInDebug, \
971 "Zap freed VM handle space with 0xBCBCBCBC") \
972 \
973 develop(bool, ZapJNIHandleArea, trueInDebug, \
974 "Zap freed JNI handle space with 0xFEFEFEFE") \
975 \
976 notproduct(bool, ZapStackSegments, trueInDebug, \
977 "Zap allocated/freed stack segments with 0xFADFADED") \
978 \
979 develop(bool, ZapUnusedHeapArea, trueInDebug, \
980 "Zap unused heap space with 0xBAADBABE") \
981 \
982 develop(bool, TraceZapUnusedHeapArea, false, \
983 "Trace zapping of unused heap space") \
984 \
985 develop(bool, CheckZapUnusedHeapArea, false, \
986 "Check zapping of unused heap space") \
987 \
988 develop(bool, ZapFillerObjects, trueInDebug, \
989 "Zap filler objects with 0xDEAFBABE") \
990 \
991 develop(bool, PrintVMMessages, true, \
992 "Print VM messages on console") \
993 \
994 product(bool, PrintGCApplicationConcurrentTime, false, \
995 "Print the time the application has been running") \
996 \
997 product(bool, PrintGCApplicationStoppedTime, false, \
998 "Print the time the application has been stopped") \
999 \
1000 diagnostic(bool, VerboseVerification, false, \
1001 "Display detailed verification details") \
1002 \
1003 notproduct(uintx, ErrorHandlerTest, 0, \
1004 "If > 0, provokes an error after VM initialization; the value " \
1005 "determines which error to provoke. See test_error_handler() " \
1006 "in debug.cpp.") \
1007 \
1008 notproduct(uintx, TestCrashInErrorHandler, 0, \
1009 "If > 0, provokes an error inside VM error handler (a secondary " \
1010 "crash). see test_error_handler() in debug.cpp.") \
1011 \
1012 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1013 "If true, tests SafeFetch inside error handler.") \
1014 \
1015 develop(bool, Verbose, false, \
1016 "Print additional debugging information from other modes") \
1017 \
1018 develop(bool, PrintMiscellaneous, false, \
1019 "Print uncategorized debugging information (requires +Verbose)") \
1020 \
1021 develop(bool, WizardMode, false, \
1022 "Print much more debugging information") \
1023 \
1024 product(bool, ShowMessageBoxOnError, false, \
1025 "Keep process alive on VM fatal error") \
1026 \
1027 product(bool, CreateCoredumpOnCrash, true, \
1028 "Create core/mini dump on VM fatal error") \
1029 \
1030 product(uintx, ErrorLogTimeout, 2 * 60, \
1031 "Timeout, in seconds, to limit the time spent on writing an " \
1032 "error log in case of a crash.") \
1033 \
1034 product_pd(bool, UseOSErrorReporting, \
1035 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1036 \
1037 product(bool, SuppressFatalErrorMessage, false, \
1038 "Report NO fatal error message (avoid deadlock)") \
1039 \
1040 product(ccstrlist, OnError, "", \
1041 "Run user-defined commands on fatal error; see VMError.cpp " \
1042 "for examples") \
1043 \
1044 product(ccstrlist, OnOutOfMemoryError, "", \
1045 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1046 \
1047 manageable(bool, HeapDumpBeforeFullGC, false, \
1048 "Dump heap to file before any major stop-the-world GC") \
1049 \
1050 manageable(bool, HeapDumpAfterFullGC, false, \
1051 "Dump heap to file after any major stop-the-world GC") \
1052 \
1053 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1054 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1055 \
1056 manageable(ccstr, HeapDumpPath, NULL, \
1057 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1058 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1059 "in the working directory)") \
1060 \
1061 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1062 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1063 "when the heap usage is larger than this") \
1064 \
1065 develop(size_t, HeapDumpSegmentSize, 1*G, \
1066 "Approximate segment size when generating a segmented heap dump") \
1067 \
1068 develop(bool, BreakAtWarning, false, \
1069 "Execute breakpoint upon encountering VM warning") \
1070 \
1071 develop(bool, TraceVMOperation, false, \
1072 "Trace VM operations") \
1073 \
1074 develop(bool, UseFakeTimers, false, \
1075 "Tell whether the VM should use system time or a fake timer") \
1076 \
1077 product(ccstr, NativeMemoryTracking, "off", \
1078 "Native memory tracking options") \
1079 \
1080 diagnostic(bool, PrintNMTStatistics, false, \
1081 "Print native memory tracking summary data if it is on") \
1082 \
1083 diagnostic(bool, LogCompilation, false, \
1084 "Log compilation activity in detail to LogFile") \
1085 \
1086 product(bool, PrintCompilation, false, \
1087 "Print compilations") \
1088 \
1089 diagnostic(bool, TraceNMethodInstalls, false, \
1090 "Trace nmethod installation") \
1091 \
1092 diagnostic(intx, ScavengeRootsInCode, 2, \
1093 "0: do not allow scavengable oops in the code cache; " \
1094 "1: allow scavenging from the code cache; " \
1095 "2: emit as many constants as the compiler can see") \
1096 range(0, 2) \
1097 \
1098 product(bool, AlwaysRestoreFPU, false, \
1099 "Restore the FPU control word after every JNI call (expensive)") \
1100 \
1101 diagnostic(bool, PrintCompilation2, false, \
1102 "Print additional statistics per compilation") \
1103 \
1104 diagnostic(bool, PrintAdapterHandlers, false, \
1105 "Print code generated for i2c/c2i adapters") \
1106 \
1107 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1108 "Verify that i2c/c2i adapters are called properly") \
1109 \
1110 develop(bool, VerifyAdapterSharing, false, \
1111 "Verify that the code for shared adapters is the equivalent") \
1112 \
1113 diagnostic(bool, PrintAssembly, false, \
1114 "Print assembly code (using external disassembler.so)") \
1115 \
1116 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1117 "Print options string passed to disassembler.so") \
1118 \
1119 diagnostic(bool, PrintNMethods, false, \
1120 "Print assembly code for nmethods when generated") \
1121 \
1122 diagnostic(bool, PrintNativeNMethods, false, \
1123 "Print assembly code for native nmethods when generated") \
1124 \
1125 develop(bool, PrintDebugInfo, false, \
1126 "Print debug information for all nmethods when generated") \
1127 \
1128 develop(bool, PrintRelocations, false, \
1129 "Print relocation information for all nmethods when generated") \
1130 \
1131 develop(bool, PrintDependencies, false, \
1132 "Print dependency information for all nmethods when generated") \
1133 \
1134 develop(bool, PrintExceptionHandlers, false, \
1135 "Print exception handler tables for all nmethods when generated") \
1136 \
1137 develop(bool, StressCompiledExceptionHandlers, false, \
1138 "Exercise compiled exception handlers") \
1139 \
1140 develop(bool, InterceptOSException, false, \
1141 "Start debugger when an implicit OS (e.g. NULL) " \
1142 "exception happens") \
1143 \
1144 product(bool, PrintCodeCache, false, \
1145 "Print the code cache memory usage when exiting") \
1146 \
1147 develop(bool, PrintCodeCache2, false, \
1148 "Print detailed usage information on the code cache when exiting")\
1149 \
1150 product(bool, PrintCodeCacheOnCompilation, false, \
1151 "Print the code cache memory usage each time a method is " \
1152 "compiled") \
1153 \
1154 diagnostic(bool, PrintStubCode, false, \
1155 "Print generated stub code") \
1156 \
1157 product(bool, StackTraceInThrowable, true, \
1158 "Collect backtrace in throwable when exception happens") \
1159 \
1160 product(bool, OmitStackTraceInFastThrow, true, \
1161 "Omit backtraces for some 'hot' exceptions in optimized code") \
1162 \
1163 product(bool, ProfilerPrintByteCodeStatistics, false, \
1164 "Print bytecode statistics when dumping profiler output") \
1165 \
1166 product(bool, ProfilerRecordPC, false, \
1167 "Collect ticks for each 16 byte interval of compiled code") \
1168 \
1169 product(bool, ProfileVM, false, \
1170 "Profile ticks that fall within VM (either in the VM Thread " \
1171 "or VM code called through stubs)") \
1172 \
1173 product(bool, ProfileIntervals, false, \
1174 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1175 \
1176 notproduct(bool, ProfilerCheckIntervals, false, \
1177 "Collect and print information on spacing of profiler ticks") \
1178 \
1179 product(bool, PrintWarnings, true, \
1180 "Print JVM warnings to output stream") \
1181 \
1182 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1183 "Print warnings for stalled SpinLocks") \
1184 \
1185 product(bool, RegisterFinalizersAtInit, true, \
1186 "Register finalizable objects at end of Object.<init> or " \
1187 "after allocation") \
1188 \
1189 develop(bool, RegisterReferences, true, \
1190 "Tell whether the VM should register soft/weak/final/phantom " \
1191 "references") \
1192 \
1193 develop(bool, IgnoreRewrites, false, \
1194 "Suppress rewrites of bytecodes in the oopmap generator. " \
1195 "This is unsafe!") \
1196 \
1197 develop(bool, PrintCodeCacheExtension, false, \
1198 "Print extension of code cache") \
1199 \
1200 develop(bool, UsePrivilegedStack, true, \
1201 "Enable the security JVM functions") \
1202 \
1203 develop(bool, ProtectionDomainVerification, true, \
1204 "Verify protection domain before resolution in system dictionary")\
1205 \
1206 product(bool, ClassUnloading, true, \
1207 "Do unloading of classes") \
1208 \
1209 product(bool, ClassUnloadingWithConcurrentMark, true, \
1210 "Do unloading of classes with a concurrent marking cycle") \
1211 \
1212 develop(bool, DisableStartThread, false, \
1213 "Disable starting of additional Java threads " \
1214 "(for debugging only)") \
1215 \
1216 develop(bool, MemProfiling, false, \
1217 "Write memory usage profiling to log file") \
1218 \
1219 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1220 "Print the system dictionary at exit") \
1221 \
1222 experimental(intx, PredictedLoadedClassCount, 0, \
1223 "Experimental: Tune loaded class cache starting size") \
1224 \
1225 diagnostic(bool, UnsyncloadClass, false, \
1226 "Unstable: VM calls loadClass unsynchronized. Custom " \
1227 "class loader must call VM synchronized for findClass " \
1228 "and defineClass.") \
1229 \
1230 product(bool, AlwaysLockClassLoader, false, \
1231 "Require the VM to acquire the class loader lock before calling " \
1232 "loadClass() even for class loaders registering " \
1233 "as parallel capable") \
1234 \
1235 product(bool, AllowParallelDefineClass, false, \
1236 "Allow parallel defineClass requests for class loaders " \
1237 "registering as parallel capable") \
1238 \
1239 product(bool, MustCallLoadClassInternal, false, \
1240 "Call loadClassInternal() rather than loadClass()") \
1241 \
1242 product_pd(bool, DontYieldALot, \
1243 "Throw away obvious excess yield calls") \
1244 \
1245 product_pd(bool, ConvertSleepToYield, \
1246 "Convert sleep(0) to thread yield " \
1247 "(may be off for Solaris to improve GUI)") \
1248 \
1249 product(bool, ConvertYieldToSleep, false, \
1250 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1251 "behavior") \
1252 \
1253 develop(bool, UseDetachedThreads, true, \
1254 "Use detached threads that are recycled upon termination " \
1255 "(for Solaris only)") \
1256 \
1257 product(bool, UseLWPSynchronization, true, \
1258 "Use LWP-based instead of libthread-based synchronization " \
1259 "(SPARC only)") \
1260 \
1261 experimental(ccstr, SyncKnobs, NULL, \
1262 "(Unstable) Various monitor synchronization tunables") \
1263 \
1264 experimental(intx, EmitSync, 0, \
1265 "(Unsafe, Unstable) " \
1266 "Control emission of inline sync fast-path code") \
1267 \
1268 product(intx, MonitorBound, 0, "Bound Monitor population") \
1269 \
1270 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1271 \
1272 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1273 "Experimental Sync flags") \
1274 \
1275 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1276 \
1277 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1278 \
1279 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1280 \
1281 experimental(intx, hashCode, 5, \
1282 "(Unstable) select hashCode generation algorithm") \
1283 \
1284 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1285 "(Unstable, Linux-specific) " \
1286 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1287 \
1288 product(bool, FilterSpuriousWakeups, true, \
1289 "When true prevents OS-level spurious, or premature, wakeups " \
1290 "from Object.wait (Ignored for Windows)") \
1291 \
1292 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1293 \
1294 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1295 \
1296 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1297 \
1298 develop(bool, UsePthreads, false, \
1299 "Use pthread-based instead of libthread-based synchronization " \
1300 "(SPARC only)") \
1301 \
1302 product(bool, ReduceSignalUsage, false, \
1303 "Reduce the use of OS signals in Java and/or the VM") \
1304 \
1305 develop_pd(bool, ShareVtableStubs, \
1306 "Share vtable stubs (smaller code but worse branch prediction") \
1307 \
1308 develop(bool, LoadLineNumberTables, true, \
1309 "Tell whether the class file parser loads line number tables") \
1310 \
1311 develop(bool, LoadLocalVariableTables, true, \
1312 "Tell whether the class file parser loads local variable tables") \
1313 \
1314 develop(bool, LoadLocalVariableTypeTables, true, \
1315 "Tell whether the class file parser loads local variable type" \
1316 "tables") \
1317 \
1318 product(bool, AllowUserSignalHandlers, false, \
1319 "Do not complain if the application installs signal handlers " \
1320 "(Solaris & Linux only)") \
1321 \
1322 product(bool, UseSignalChaining, true, \
1323 "Use signal-chaining to invoke signal handlers installed " \
1324 "by the application (Solaris & Linux only)") \
1325 \
1326 product(bool, UseAltSigs, false, \
1327 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1328 "internal signals (Solaris only)") \
1329 \
1330 product(bool, AllowJNIEnvProxy, false, \
1331 "Allow JNIEnv proxies for jdbx") \
1332 \
1333 product(bool, JNIDetachReleasesMonitors, true, \
1334 "JNI DetachCurrentThread releases monitors owned by thread") \
1335 \
1336 product(bool, RestoreMXCSROnJNICalls, false, \
1337 "Restore MXCSR when returning from JNI calls") \
1338 \
1339 product(bool, CheckJNICalls, false, \
1340 "Verify all arguments to JNI calls") \
1341 \
1342 product(bool, CheckEndorsedAndExtDirs, false, \
1343 "Verify the endorsed and extension directories are not used") \
1344 \
1345 product(bool, UseFastJNIAccessors, true, \
1346 "Use optimized versions of Get<Primitive>Field") \
1347 \
1348 product(intx, MaxJNILocalCapacity, 65536, \
1349 "Maximum allowable local JNI handle capacity to " \
1350 "EnsureLocalCapacity() and PushLocalFrame(), " \
1351 "where <= 0 is unlimited, default: 65536") \
1352 \
1353 product(bool, EagerXrunInit, false, \
1354 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1355 "but not all -Xrun libraries may support the state of the VM " \
1356 "at this time") \
1357 \
1358 product(bool, PreserveAllAnnotations, false, \
1359 "Preserve RuntimeInvisibleAnnotations as well " \
1360 "as RuntimeVisibleAnnotations") \
1361 \
1362 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1363 "Number of OutOfMemoryErrors preallocated with backtrace") \
1364 \
1365 product(bool, UseXMMForArrayCopy, false, \
1366 "Use SSE2 MOVQ instruction for Arraycopy") \
1367 \
1368 product(intx, FieldsAllocationStyle, 1, \
1369 "0 - type based with oops first, " \
1370 "1 - with oops last, " \
1371 "2 - oops in super and sub classes are together") \
1372 range(0, 2) \
1373 \
1374 product(bool, CompactFields, true, \
1375 "Allocate nonstatic fields in gaps between previous fields") \
1376 \
1377 notproduct(bool, PrintFieldLayout, false, \
1378 "Print field layout for each class") \
1379 \
1380 /* Need to limit the extent of the padding to reasonable size. */\
1381 /* 8K is well beyond the reasonable HW cache line size, even with */\
1382 /* aggressive prefetching, while still leaving the room for segregating */\
1383 /* among the distinct pages. */\
1384 product(intx, ContendedPaddingWidth, 128, \
1385 "How many bytes to pad the fields/classes marked @Contended with")\
1386 range(0, 8192) \
1387 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \
1388 \
1389 product(bool, EnableContended, true, \
1390 "Enable @Contended annotation support") \
1391 \
1392 product(bool, RestrictContended, true, \
1393 "Restrict @Contended to trusted classes") \
1394 \
1395 product(bool, UseBiasedLocking, true, \
1396 "Enable biased locking in JVM") \
1397 \
1398 product(intx, BiasedLockingStartupDelay, 4000, \
1399 "Number of milliseconds to wait before enabling biased locking") \
1400 \
1401 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1402 "Print statistics of biased locking in JVM") \
1403 \
1404 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1405 "Threshold of number of revocations per type to try to " \
1406 "rebias all objects in the heap of that type") \
1407 \
1408 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1409 "Threshold of number of revocations per type to permanently " \
1410 "revoke biases of all objects in the heap of that type") \
1411 \
1412 product(intx, BiasedLockingDecayTime, 25000, \
1413 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1414 "type after previous bulk rebias") \
1415 \
1416 /* tracing */ \
1417 \
1418 notproduct(bool, TraceRuntimeCalls, false, \
1419 "Trace run-time calls") \
1420 \
1421 develop(bool, TraceJNICalls, false, \
1422 "Trace JNI calls") \
1423 \
1424 develop(bool, StressRewriter, false, \
1425 "Stress linktime bytecode rewriting") \
1426 \
1427 notproduct(bool, TraceJVMCalls, false, \
1428 "Trace JVM calls") \
1429 \
1430 product(ccstr, TraceJVMTI, NULL, \
1431 "Trace flags for JVMTI functions and events") \
1432 \
1433 /* This option can change an EMCP method into an obsolete method. */ \
1434 /* This can affect tests that except specific methods to be EMCP. */ \
1435 /* This option should be used with caution. */ \
1436 product(bool, StressLdcRewrite, false, \
1437 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1438 \
1439 product(intx, TraceRedefineClasses, 0, \
1440 "Trace level for JVMTI RedefineClasses") \
1441 \
1442 /* change to false by default sometime after Mustang */ \
1443 product(bool, VerifyMergedCPBytecodes, true, \
1444 "Verify bytecodes after RedefineClasses constant pool merging") \
1445 \
1446 develop(bool, TraceJNIHandleAllocation, false, \
1447 "Trace allocation/deallocation of JNI handle blocks") \
1448 \
1449 develop(bool, TraceBytecodes, false, \
1450 "Trace bytecode execution") \
1451 \
1452 develop(bool, TraceClassInitialization, false, \
1453 "Trace class initialization") \
1454 \
1455 product(bool, TraceExceptions, false, \
1456 "Trace exceptions") \
1457 \
1458 develop(bool, TraceICs, false, \
1459 "Trace inline cache changes") \
1460 \
1461 notproduct(bool, TraceInvocationCounterOverflow, false, \
1462 "Trace method invocation counter overflow") \
1463 \
1464 develop(bool, TraceInlineCacheClearing, false, \
1465 "Trace clearing of inline caches in nmethods") \
1466 \
1467 develop(bool, TraceDependencies, false, \
1468 "Trace dependencies") \
1469 \
1470 develop(bool, VerifyDependencies, trueInDebug, \
1471 "Exercise and verify the compilation dependency mechanism") \
1472 \
1473 develop(bool, TraceNewOopMapGeneration, false, \
1474 "Trace OopMapGeneration") \
1475 \
1476 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1477 "Trace OopMapGeneration: print detailed cell states") \
1478 \
1479 develop(bool, TimeOopMap, false, \
1480 "Time calls to GenerateOopMap::compute_map() in sum") \
1481 \
1482 develop(bool, TimeOopMap2, false, \
1483 "Time calls to GenerateOopMap::compute_map() individually") \
1484 \
1485 develop(bool, TraceMonitorMismatch, false, \
1486 "Trace monitor matching failures during OopMapGeneration") \
1487 \
1488 develop(bool, TraceOopMapRewrites, false, \
1489 "Trace rewriting of method oops during oop map generation") \
1490 \
1491 develop(bool, TraceSafepoint, false, \
1492 "Trace safepoint operations") \
1493 \
1494 develop(bool, TraceICBuffer, false, \
1495 "Trace usage of IC buffer") \
1496 \
1497 develop(bool, TraceCompiledIC, false, \
1498 "Trace changes of compiled IC") \
1499 \
1500 notproduct(bool, TraceZapDeadLocals, false, \
1501 "Trace zapping dead locals") \
1502 \
1503 develop(bool, TraceStartupTime, false, \
1504 "Trace setup time") \
1505 \
1506 develop(bool, TraceProtectionDomainVerification, false, \
1507 "Trace protection domain verification") \
1508 \
1509 develop(bool, TraceClearedExceptions, false, \
1510 "Print when an exception is forcibly cleared") \
1511 \
1512 product(bool, TraceClassResolution, false, \
1513 "Trace all constant pool resolutions (for debugging)") \
1514 \
1515 product(bool, TraceBiasedLocking, false, \
1516 "Trace biased locking in JVM") \
1517 \
1518 product(bool, TraceMonitorInflation, false, \
1519 "Trace monitor inflation in JVM") \
1520 \
1521 /* gc */ \
1522 \
1523 product(bool, UseSerialGC, false, \
1524 "Use the Serial garbage collector") \
1525 \
1526 product(bool, UseG1GC, false, \
1527 "Use the Garbage-First garbage collector") \
1528 \
1529 product(bool, UseParallelGC, false, \
1530 "Use the Parallel Scavenge garbage collector") \
1531 \
1532 product(bool, UseParallelOldGC, false, \
1533 "Use the Parallel Old garbage collector") \
1534 \
1535 product(uintx, HeapMaximumCompactionInterval, 20, \
1536 "How often should we maximally compact the heap (not allowing " \
1537 "any dead space)") \
1538 \
1539 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1540 "The collection count for the first maximum compaction") \
1541 \
1542 product(bool, UseMaximumCompactionOnSystemGC, true, \
1543 "Use maximum compaction in the Parallel Old garbage collector " \
1544 "for a system GC") \
1545 \
1546 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1547 "The mean used by the parallel compact dead wood " \
1548 "limiter (a number between 0-100)") \
1549 range(0, 100) \
1550 \
1551 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1552 "The standard deviation used by the parallel compact dead wood " \
1553 "limiter (a number between 0-100)") \
1554 range(0, 100) \
1555 \
1556 product(uint, ParallelGCThreads, 0, \
1557 "Number of parallel threads parallel gc will use") \
1558 \
1559 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1560 "Use semaphore synchronization for the GC Threads, " \
1561 "instead of synchronization based on mutexes") \
1562 \
1563 product(bool, UseDynamicNumberOfGCThreads, false, \
1564 "Dynamically choose the number of parallel threads " \
1565 "parallel gc will use") \
1566 \
1567 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1568 "Force dynamic selection of the number of " \
1569 "parallel threads parallel gc will use to aid debugging") \
1570 \
1571 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1572 "Size of heap (bytes) per GC thread used in calculating the " \
1573 "number of GC threads") \
1574 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1575 \
1576 product(bool, TraceDynamicGCThreads, false, \
1577 "Trace the dynamic GC thread usage") \
1578 \
1579 develop(bool, ParallelOldGCSplitALot, false, \
1580 "Provoke splitting (copying data from a young gen space to " \
1581 "multiple destination spaces)") \
1582 \
1583 develop(uintx, ParallelOldGCSplitInterval, 3, \
1584 "How often to provoke splitting a young gen space") \
1585 range(0, max_uintx) \
1586 \
1587 product(uint, ConcGCThreads, 0, \
1588 "Number of threads concurrent gc will use") \
1589 \
1590 product(size_t, YoungPLABSize, 4096, \
1591 "Size of young gen promotion LAB's (in HeapWords)") \
1592 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
1593 \
1594 product(size_t, OldPLABSize, 1024, \
1595 "Size of old gen promotion LAB's (in HeapWords), or Number \
1596 of blocks to attempt to claim when refilling CMS LAB's") \
1597 \
1598 product(uintx, GCTaskTimeStampEntries, 200, \
1599 "Number of time stamp entries per gc worker thread") \
1600 range(1, max_uintx) \
1601 \
1602 product(bool, AlwaysTenure, false, \
1603 "Always tenure objects in eden (ParallelGC only)") \
1604 \
1605 product(bool, NeverTenure, false, \
1606 "Never tenure objects in eden, may tenure on overflow " \
1607 "(ParallelGC only)") \
1608 \
1609 product(bool, ScavengeBeforeFullGC, true, \
1610 "Scavenge young generation before each full GC.") \
1611 \
1612 develop(bool, ScavengeWithObjectsInToSpace, false, \
1613 "Allow scavenges to occur when to-space contains objects") \
1614 \
1615 product(bool, UseConcMarkSweepGC, false, \
1616 "Use Concurrent Mark-Sweep GC in the old generation") \
1617 \
1618 product(bool, ExplicitGCInvokesConcurrent, false, \
1619 "A System.gc() request invokes a concurrent collection; " \
1620 "(effective only when using concurrent collectors)") \
1621 \
1622 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1623 "A System.gc() request invokes a concurrent collection and " \
1624 "also unloads classes during such a concurrent gc cycle " \
1625 "(effective only when UseConcMarkSweepGC)") \
1626 \
1627 product(bool, GCLockerInvokesConcurrent, false, \
1628 "The exit of a JNI critical section necessitating a scavenge, " \
1629 "also kicks off a background concurrent collection") \
1630 \
1631 product(uintx, GCLockerEdenExpansionPercent, 5, \
1632 "How much the GC can expand the eden by while the GC locker " \
1633 "is active (as a percentage)") \
1634 range(0, 100) \
1635 \
1636 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1637 "Number of times to retry allocations when " \
1638 "blocked by the GC locker") \
1639 \
1640 develop(bool, UseCMSAdaptiveFreeLists, true, \
1641 "Use adaptive free lists in the CMS generation") \
1642 \
1643 develop(bool, UseAsyncConcMarkSweepGC, true, \
1644 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1645 \
1646 product(bool, UseCMSBestFit, true, \
1647 "Use CMS best fit allocation strategy") \
1648 \
1649 product(bool, UseParNewGC, false, \
1650 "Use parallel threads in the new generation") \
1651 \
1652 product(bool, PrintTaskqueue, false, \
1653 "Print taskqueue statistics for parallel collectors") \
1654 \
1655 product(bool, PrintTerminationStats, false, \
1656 "Print termination statistics for parallel collectors") \
1657 \
1658 product(uintx, ParallelGCBufferWastePct, 10, \
1659 "Wasted fraction of parallel allocation buffer") \
1660 range(0, 100) \
1661 \
1662 product(uintx, TargetPLABWastePct, 10, \
1663 "Target wasted space in last buffer as percent of overall " \
1664 "allocation") \
1665 range(1, 100) \
1666 \
1667 product(uintx, PLABWeight, 75, \
1668 "Percentage (0-100) used to weight the current sample when " \
1669 "computing exponentially decaying average for ResizePLAB") \
1670 range(0, 100) \
1671 \
1672 product(bool, ResizePLAB, true, \
1673 "Dynamically resize (survivor space) promotion LAB's") \
1674 \
1675 product(bool, PrintPLAB, false, \
1676 "Print (survivor space) promotion LAB's sizing decisions") \
1677 \
1678 product(intx, ParGCArrayScanChunk, 50, \
1679 "Scan a subset of object array and push remainder, if array is " \
1680 "bigger than this") \
1681 range(1, max_intx) \
1682 \
1683 product(bool, ParGCUseLocalOverflow, false, \
1684 "Instead of a global overflow list, use local overflow stacks") \
1685 \
1686 product(bool, ParGCTrimOverflow, true, \
1687 "Eagerly trim the local overflow lists " \
1688 "(when ParGCUseLocalOverflow)") \
1689 \
1690 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1691 "Simulate work queue overflow in ParNew") \
1692 \
1693 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1694 "An `interval' counter that determines how frequently " \
1695 "we simulate overflow; a smaller number increases frequency") \
1696 \
1697 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1698 "The desired number of objects to claim from the overflow list") \
1699 \
1700 diagnostic(uintx, ParGCStridesPerThread, 2, \
1701 "The number of strides per worker thread that we divide up the " \
1702 "card table scanning work into") \
1703 range(1, max_uintx) \
1704 \
1705 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1706 "The number of cards in each chunk of the parallel chunks used " \
1707 "during card table scanning") \
1708 range(1, max_intx) \
1709 \
1710 product(uintx, OldPLABWeight, 50, \
1711 "Percentage (0-100) used to weight the current sample when " \
1712 "computing exponentially decaying average for resizing " \
1713 "OldPLABSize") \
1714 range(0, 100) \
1715 \
1716 product(bool, ResizeOldPLAB, true, \
1717 "Dynamically resize (old gen) promotion LAB's") \
1718 \
1719 product(bool, PrintOldPLAB, false, \
1720 "Print (old gen) promotion LAB's sizing decisions") \
1721 \
1722 product(size_t, CMSOldPLABMax, 1024, \
1723 "Maximum size of CMS gen promotion LAB caches per worker " \
1724 "per block size") \
1725 range(1, max_uintx) \
1726 \
1727 product(size_t, CMSOldPLABMin, 16, \
1728 "Minimum size of CMS gen promotion LAB caches per worker " \
1729 "per block size") \
1730 range(1, max_uintx) \
1731 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \
1732 \
1733 product(uintx, CMSOldPLABNumRefills, 4, \
1734 "Nominal number of refills of CMS gen promotion LAB cache " \
1735 "per worker per block size") \
1736 range(1, max_uintx) \
1737 \
1738 product(bool, CMSOldPLABResizeQuicker, false, \
1739 "React on-the-fly during a scavenge to a sudden " \
1740 "change in block demand rate") \
1741 \
1742 product(uintx, CMSOldPLABToleranceFactor, 4, \
1743 "The tolerance of the phase-change detector for on-the-fly " \
1744 "PLAB resizing during a scavenge") \
1745 range(1, max_uintx) \
1746 \
1747 product(uintx, CMSOldPLABReactivityFactor, 2, \
1748 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1749 "during a scavenge") \
1750 \
1751 product(bool, AlwaysPreTouch, false, \
1752 "Force all freshly committed pages to be pre-touched") \
1753 \
1754 product_pd(size_t, CMSYoungGenPerWorker, \
1755 "The maximum size of young gen chosen by default per GC worker " \
1756 "thread available") \
1757 range(1, max_uintx) \
1758 \
1759 product(uintx, CMSIncrementalSafetyFactor, 10, \
1760 "Percentage (0-100) used to add conservatism when computing the " \
1761 "duty cycle") \
1762 range(0, 100) \
1763 \
1764 product(uintx, CMSExpAvgFactor, 50, \
1765 "Percentage (0-100) used to weight the current sample when " \
1766 "computing exponential averages for CMS statistics") \
1767 range(0, 100) \
1768 \
1769 product(uintx, CMS_FLSWeight, 75, \
1770 "Percentage (0-100) used to weight the current sample when " \
1771 "computing exponentially decaying averages for CMS FLS " \
1772 "statistics") \
1773 range(0, 100) \
1774 \
1775 product(uintx, CMS_FLSPadding, 1, \
1776 "The multiple of deviation from mean to use for buffering " \
1777 "against volatility in free list demand") \
1778 \
1779 product(uintx, FLSCoalescePolicy, 2, \
1780 "CMS: aggressiveness level for coalescing, increasing " \
1781 "from 0 to 4") \
1782 range(0, 4) \
1783 \
1784 product(bool, FLSAlwaysCoalesceLarge, false, \
1785 "CMS: larger free blocks are always available for coalescing") \
1786 \
1787 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1788 "CMS: the smaller the percentage the greater the coalescing " \
1789 "force") \
1790 \
1791 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1792 "CMS: the factor by which to inflate estimated demand of small " \
1793 "block sizes to prevent coalescing with an adjoining block") \
1794 \
1795 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1796 "CMS: the factor by which to inflate estimated demand of large " \
1797 "block sizes to prevent coalescing with an adjoining block") \
1798 \
1799 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1800 "CMS: the factor by which to inflate estimated demand of small " \
1801 "block sizes to prevent splitting to supply demand for smaller " \
1802 "blocks") \
1803 \
1804 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1805 "CMS: the factor by which to inflate estimated demand of large " \
1806 "block sizes to prevent splitting to supply demand for smaller " \
1807 "blocks") \
1808 \
1809 product(bool, CMSExtrapolateSweep, false, \
1810 "CMS: cushion for block demand during sweep") \
1811 \
1812 product(uintx, CMS_SweepWeight, 75, \
1813 "Percentage (0-100) used to weight the current sample when " \
1814 "computing exponentially decaying average for inter-sweep " \
1815 "duration") \
1816 range(0, 100) \
1817 \
1818 product(uintx, CMS_SweepPadding, 1, \
1819 "The multiple of deviation from mean to use for buffering " \
1820 "against volatility in inter-sweep duration") \
1821 \
1822 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1823 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1824 "duration exceeds this threshold in milliseconds") \
1825 \
1826 product(bool, CMSClassUnloadingEnabled, true, \
1827 "Whether class unloading enabled when using CMS GC") \
1828 \
1829 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1830 "When CMS class unloading is enabled, the maximum CMS cycle " \
1831 "count for which classes may not be unloaded") \
1832 \
1833 develop(intx, CMSDictionaryChoice, 0, \
1834 "Use BinaryTreeDictionary as default in the CMS generation") \
1835 \
1836 product(uintx, CMSIndexedFreeListReplenish, 4, \
1837 "Replenish an indexed free list with this number of chunks") \
1838 \
1839 product(bool, CMSReplenishIntermediate, true, \
1840 "Replenish all intermediate free-list caches") \
1841 \
1842 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1843 "When satisfying batched demand, split blocks from the " \
1844 "IndexedFreeList whose size is a multiple of requested size") \
1845 \
1846 product(bool, CMSLoopWarn, false, \
1847 "Warn in case of excessive CMS looping") \
1848 \
1849 develop(bool, CMSOverflowEarlyRestoration, false, \
1850 "Restore preserved marks early") \
1851 \
1852 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1853 "Size of marking stack") \
1854 \
1855 /* where does the range max value of (max_jint - 1) come from? */ \
1856 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1857 "Maximum size of marking stack") \
1858 range(1, (max_jint - 1)) \
1859 \
1860 notproduct(bool, CMSMarkStackOverflowALot, false, \
1861 "Simulate frequent marking stack / work queue overflow") \
1862 \
1863 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1864 "An \"interval\" counter that determines how frequently " \
1865 "to simulate overflow; a smaller number increases frequency") \
1866 \
1867 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1868 "Maximum number of abortable preclean iterations, if > 0") \
1869 \
1870 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1871 "Maximum time in abortable preclean (in milliseconds)") \
1872 \
1873 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1874 "Nominal minimum work per abortable preclean iteration") \
1875 \
1876 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1877 "Time that we sleep between iterations when not given " \
1878 "enough work per iteration") \
1879 \
1880 product(size_t, CMSRescanMultiple, 32, \
1881 "Size (in cards) of CMS parallel rescan task") \
1882 range(1, max_uintx) \
1883 \
1884 product(size_t, CMSConcMarkMultiple, 32, \
1885 "Size (in cards) of CMS concurrent MT marking task") \
1886 range(1, max_uintx) \
1887 \
1888 product(bool, CMSAbortSemantics, false, \
1889 "Whether abort-on-overflow semantics is implemented") \
1890 \
1891 product(bool, CMSParallelInitialMarkEnabled, true, \
1892 "Use the parallel initial mark.") \
1893 \
1894 product(bool, CMSParallelRemarkEnabled, true, \
1895 "Whether parallel remark enabled (only if ParNewGC)") \
1896 \
1897 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1898 "Whether parallel remark of survivor space " \
1899 "enabled (effective only if CMSParallelRemarkEnabled)") \
1900 \
1901 product(bool, CMSPLABRecordAlways, true, \
1902 "Always record survivor space PLAB boundaries (effective only " \
1903 "if CMSParallelSurvivorRemarkEnabled)") \
1904 \
1905 product(bool, CMSEdenChunksRecordAlways, true, \
1906 "Always record eden chunks used for the parallel initial mark " \
1907 "or remark of eden") \
1908 \
1909 product(bool, CMSPrintEdenSurvivorChunks, false, \
1910 "Print the eden and the survivor chunks used for the parallel " \
1911 "initial mark or remark of the eden/survivor spaces") \
1912 \
1913 product(bool, CMSConcurrentMTEnabled, true, \
1914 "Whether multi-threaded concurrent work enabled " \
1915 "(effective only if ParNewGC)") \
1916 \
1917 product(bool, CMSPrecleaningEnabled, true, \
1918 "Whether concurrent precleaning enabled") \
1919 \
1920 product(uintx, CMSPrecleanIter, 3, \
1921 "Maximum number of precleaning iteration passes") \
1922 range(0, 9) \
1923 \
1924 product(uintx, CMSPrecleanDenominator, 3, \
1925 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1926 "ratio") \
1927 range(1, max_uintx) \
1928 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1929 \
1930 product(uintx, CMSPrecleanNumerator, 2, \
1931 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1932 "ratio") \
1933 range(0, max_uintx-1) \
1934 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1935 \
1936 product(bool, CMSPrecleanRefLists1, true, \
1937 "Preclean ref lists during (initial) preclean phase") \
1938 \
1939 product(bool, CMSPrecleanRefLists2, false, \
1940 "Preclean ref lists during abortable preclean phase") \
1941 \
1942 product(bool, CMSPrecleanSurvivors1, false, \
1943 "Preclean survivors during (initial) preclean phase") \
1944 \
1945 product(bool, CMSPrecleanSurvivors2, true, \
1946 "Preclean survivors during abortable preclean phase") \
1947 \
1948 product(uintx, CMSPrecleanThreshold, 1000, \
1949 "Do not iterate again if number of dirty cards is less than this")\
1950 range(100, max_uintx) \
1951 \
1952 product(bool, CMSCleanOnEnter, true, \
1953 "Clean-on-enter optimization for reducing number of dirty cards") \
1954 \
1955 product(uintx, CMSRemarkVerifyVariant, 1, \
1956 "Choose variant (1,2) of verification following remark") \
1957 range(1, 2) \
1958 \
1959 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1960 "If Eden size is below this, do not try to schedule remark") \
1961 \
1962 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1963 "The Eden occupancy percentage (0-100) at which " \
1964 "to try and schedule remark pause") \
1965 range(0, 100) \
1966 \
1967 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1968 "Start sampling eden top at least before young gen " \
1969 "occupancy reaches 1/<ratio> of the size at which " \
1970 "we plan to schedule remark") \
1971 range(1, max_uintx) \
1972 \
1973 product(uintx, CMSSamplingGrain, 16*K, \
1974 "The minimum distance between eden samples for CMS (see above)") \
1975 range(1, max_uintx) \
1976 \
1977 product(bool, CMSScavengeBeforeRemark, false, \
1978 "Attempt scavenge before the CMS remark step") \
1979 \
1980 develop(bool, CMSTraceSweeper, false, \
1981 "Trace some actions of the CMS sweeper") \
1982 \
1983 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1984 "Don't drain below this size per parallel worker/thief") \
1985 \
1986 manageable(intx, CMSWaitDuration, 2000, \
1987 "Time in milliseconds that CMS thread waits for young GC") \
1988 \
1989 develop(uintx, CMSCheckInterval, 1000, \
1990 "Interval in milliseconds that CMS thread checks if it " \
1991 "should start a collection cycle") \
1992 \
1993 product(bool, CMSYield, true, \
1994 "Yield between steps of CMS") \
1995 \
1996 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1997 "Bitmap operations should process at most this many bits " \
1998 "between yields") \
1999 range(1, max_uintx) \
2000 \
2001 product(bool, CMSDumpAtPromotionFailure, false, \
2002 "Dump useful information about the state of the CMS old " \
2003 "generation upon a promotion failure") \
2004 \
2005 product(bool, CMSPrintChunksInDump, false, \
2006 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2007 "more detailed information about the free chunks") \
2008 \
2009 product(bool, CMSPrintObjectsInDump, false, \
2010 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2011 "more detailed information about the allocated objects") \
2012 \
2013 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
2014 "Verify that all references across the FLS boundary " \
2015 "are to valid objects") \
2016 \
2017 diagnostic(bool, FLSVerifyLists, false, \
2018 "Do lots of (expensive) FreeListSpace verification") \
2019 \
2020 diagnostic(bool, FLSVerifyIndexTable, false, \
2021 "Do lots of (expensive) FLS index table verification") \
2022 \
2023 develop(bool, FLSVerifyDictionary, false, \
2024 "Do lots of (expensive) FLS dictionary verification") \
2025 \
2026 develop(bool, VerifyBlockOffsetArray, false, \
2027 "Do (expensive) block offset array verification") \
2028 \
2029 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2030 "Maintain _unallocated_block in BlockOffsetArray " \
2031 "(currently applicable only to CMS collector)") \
2032 \
2033 develop(bool, TraceCMSState, false, \
2034 "Trace the state of the CMS collection") \
2035 \
2036 product(intx, RefDiscoveryPolicy, 0, \
2037 "Select type of reference discovery policy: " \
2038 "reference-based(0) or referent-based(1)") \
2039 range(ReferenceProcessor::DiscoveryPolicyMin, \
2040 ReferenceProcessor::DiscoveryPolicyMax) \
2041 \
2042 product(bool, ParallelRefProcEnabled, false, \
2043 "Enable parallel reference processing whenever possible") \
2044 \
2045 product(bool, ParallelRefProcBalancingEnabled, true, \
2046 "Enable balancing of reference processing queues") \
2047 \
2048 product(uintx, CMSTriggerRatio, 80, \
2049 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2050 "allocated before a CMS collection cycle commences") \
2051 range(0, 100) \
2052 \
2053 product(uintx, CMSBootstrapOccupancy, 50, \
2054 "Percentage CMS generation occupancy at which to " \
2055 "initiate CMS collection for bootstrapping collection stats") \
2056 range(0, 100) \
2057 \
2058 product(intx, CMSInitiatingOccupancyFraction, -1, \
2059 "Percentage CMS generation occupancy to start a CMS collection " \
2060 "cycle. A negative value means that CMSTriggerRatio is used") \
2061 range(min_intx, 100) \
2062 \
2063 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2064 "Percentage of the (entire) heap occupancy to start a " \
2065 "concurrent GC cycle. It is used by GCs that trigger a " \
2066 "concurrent GC cycle based on the occupancy of the entire heap, " \
2067 "not just one of the generations (e.g., G1). A value of 0 " \
2068 "denotes 'do constant GC cycles'.") \
2069 range(0, 100) \
2070 \
2071 manageable(intx, CMSTriggerInterval, -1, \
2072 "Commence a CMS collection cycle (at least) every so many " \
2073 "milliseconds (0 permanently, -1 disabled)") \
2074 range(-1, max_intx) \
2075 \
2076 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2077 "Only use occupancy as a criterion for starting a CMS collection")\
2078 \
2079 product(uintx, CMSIsTooFullPercentage, 98, \
2080 "An absolute ceiling above which CMS will always consider the " \
2081 "unloading of classes when class unloading is enabled") \
2082 range(0, 100) \
2083 \
2084 develop(bool, CMSTestInFreeList, false, \
2085 "Check if the coalesced range is already in the " \
2086 "free lists as claimed") \
2087 \
2088 notproduct(bool, CMSVerifyReturnedBytes, false, \
2089 "Check that all the garbage collected was returned to the " \
2090 "free lists") \
2091 \
2092 notproduct(bool, ScavengeALot, false, \
2093 "Force scavenge at every Nth exit from the runtime system " \
2094 "(N=ScavengeALotInterval)") \
2095 \
2096 develop(bool, FullGCALot, false, \
2097 "Force full gc at every Nth exit from the runtime system " \
2098 "(N=FullGCALotInterval)") \
2099 \
2100 notproduct(bool, GCALotAtAllSafepoints, false, \
2101 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2102 \
2103 product(bool, PrintPromotionFailure, false, \
2104 "Print additional diagnostic information following " \
2105 "promotion failure") \
2106 \
2107 notproduct(bool, PromotionFailureALot, false, \
2108 "Use promotion failure handling on every young generation " \
2109 "collection") \
2110 \
2111 develop(uintx, PromotionFailureALotCount, 1000, \
2112 "Number of promotion failures occurring at PLAB " \
2113 "refill attempts (ParNew) or promotion attempts " \
2114 "(other young collectors)") \
2115 \
2116 develop(uintx, PromotionFailureALotInterval, 5, \
2117 "Total collections between promotion failures a lot") \
2118 \
2119 experimental(uintx, WorkStealingSleepMillis, 1, \
2120 "Sleep time when sleep is used for yields") \
2121 \
2122 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2123 "Number of yields before a sleep is done during work stealing") \
2124 \
2125 experimental(uintx, WorkStealingHardSpins, 4096, \
2126 "Number of iterations in a spin loop between checks on " \
2127 "time out of hard spin") \
2128 \
2129 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2130 "Ratio of hard spins to calls to yield") \
2131 \
2132 develop(uintx, ObjArrayMarkingStride, 512, \
2133 "Number of object array elements to push onto the marking stack " \
2134 "before pushing a continuation entry") \
2135 \
2136 develop(bool, MetadataAllocationFailALot, false, \
2137 "Fail metadata allocations at intervals controlled by " \
2138 "MetadataAllocationFailALotInterval") \
2139 \
2140 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2141 "Metadata allocation failure a lot interval") \
2142 \
2143 develop(bool, TraceMetadataChunkAllocation, false, \
2144 "Trace chunk metadata allocations") \
2145 \
2146 product(bool, TraceMetadataHumongousAllocation, false, \
2147 "Trace humongous metadata allocations") \
2148 \
2149 develop(bool, TraceMetavirtualspaceAllocation, false, \
2150 "Trace virtual space metadata allocations") \
2151 \
2152 notproduct(bool, ExecuteInternalVMTests, false, \
2153 "Enable execution of internal VM tests") \
2154 \
2155 notproduct(bool, VerboseInternalVMTests, false, \
2156 "Turn on logging for internal VM tests.") \
2157 \
2158 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2159 \
2160 product_pd(bool, ResizeTLAB, \
2161 "Dynamically resize TLAB size for threads") \
2162 \
2163 product(bool, ZeroTLAB, false, \
2164 "Zero out the newly created TLAB") \
2165 \
2166 product(bool, FastTLABRefill, true, \
2167 "Use fast TLAB refill code") \
2168 \
2169 product(bool, PrintTLAB, false, \
2170 "Print various TLAB related information") \
2171 \
2172 product(bool, TLABStats, true, \
2173 "Provide more detailed and expensive TLAB statistics " \
2174 "(with PrintTLAB)") \
2175 \
2176 product_pd(bool, NeverActAsServerClassMachine, \
2177 "Never act like a server-class machine") \
2178 \
2179 product(bool, AlwaysActAsServerClassMachine, false, \
2180 "Always act like a server-class machine") \
2181 \
2182 product_pd(uint64_t, MaxRAM, \
2183 "Real memory size (in bytes) used to set maximum heap size") \
2184 \
2185 product(size_t, ErgoHeapSizeLimit, 0, \
2186 "Maximum ergonomically set heap size (in bytes); zero means use " \
2187 "MaxRAM / MaxRAMFraction") \
2188 \
2189 product(uintx, MaxRAMFraction, 4, \
2190 "Maximum fraction (1/n) of real memory used for maximum heap " \
2191 "size") \
2192 range(1, max_uintx) \
2193 \
2194 product(uintx, DefaultMaxRAMFraction, 4, \
2195 "Maximum fraction (1/n) of real memory used for maximum heap " \
2196 "size; deprecated: to be renamed to MaxRAMFraction") \
2197 range(1, max_uintx) \
2198 \
2199 product(uintx, MinRAMFraction, 2, \
2200 "Minimum fraction (1/n) of real memory used for maximum heap " \
2201 "size on systems with small physical memory size") \
2202 range(1, max_uintx) \
2203 \
2204 product(uintx, InitialRAMFraction, 64, \
2205 "Fraction (1/n) of real memory used for initial heap size") \
2206 range(1, max_uintx) \
2207 \
2208 develop(uintx, MaxVirtMemFraction, 2, \
2209 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2210 "determining maximum heap size") \
2211 \
2212 product(bool, UseAutoGCSelectPolicy, false, \
2213 "Use automatic collection selection policy") \
2214 \
2215 product(uintx, AutoGCSelectPauseMillis, 5000, \
2216 "Automatic GC selection pause threshold in milliseconds") \
2217 \
2218 product(bool, UseAdaptiveSizePolicy, true, \
2219 "Use adaptive generation sizing policies") \
2220 \
2221 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2222 "Use adaptive survivor sizing policies") \
2223 \
2224 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2225 "Use adaptive young-old sizing policies at minor collections") \
2226 \
2227 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2228 "Use adaptive young-old sizing policies at major collections") \
2229 \
2230 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2231 "Include statistics from System.gc() for adaptive size policy") \
2232 \
2233 product(bool, UseAdaptiveGCBoundary, false, \
2234 "Allow young-old boundary to move") \
2235 \
2236 develop(bool, TraceAdaptiveGCBoundary, false, \
2237 "Trace young-old boundary moves") \
2238 \
2239 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2240 "Resize the virtual spaces of the young or old generations") \
2241 \
2242 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2243 "Policy for changing generation size for throughput goals") \
2244 \
2245 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2246 "Adjust tenured generation to achieve a minor pause goal") \
2247 \
2248 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2249 "Adjust young generation to achieve a major pause goal") \
2250 \
2251 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2252 "Number of steps where heuristics is used before data is used") \
2253 \
2254 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2255 "Number of collections before the adaptive sizing is started") \
2256 \
2257 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2258 "Collection interval for printing information; zero means never") \
2259 \
2260 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2261 "Use adaptive minimum footprint as a goal") \
2262 \
2263 product(uintx, AdaptiveSizePolicyWeight, 10, \
2264 "Weight given to exponential resizing, between 0 and 100") \
2265 range(0, 100) \
2266 \
2267 product(uintx, AdaptiveTimeWeight, 25, \
2268 "Weight given to time in adaptive policy, between 0 and 100") \
2269 range(0, 100) \
2270 \
2271 product(uintx, PausePadding, 1, \
2272 "How much buffer to keep for pause time") \
2273 \
2274 product(uintx, PromotedPadding, 3, \
2275 "How much buffer to keep for promotion failure") \
2276 \
2277 product(uintx, SurvivorPadding, 3, \
2278 "How much buffer to keep for survivor overflow") \
2279 \
2280 product(uintx, ThresholdTolerance, 10, \
2281 "Allowed collection cost difference between generations") \
2282 range(0, 100) \
2283 \
2284 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2285 "If collection costs are within margin, reduce both by full " \
2286 "delta") \
2287 \
2288 product(uintx, YoungGenerationSizeIncrement, 20, \
2289 "Adaptive size percentage change in young generation") \
2290 range(0, 100) \
2291 \
2292 product(uintx, YoungGenerationSizeSupplement, 80, \
2293 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2294 range(0, 100) \
2295 \
2296 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2297 "Decay factor to YoungedGenerationSizeSupplement") \
2298 range(1, max_uintx) \
2299 \
2300 product(uintx, TenuredGenerationSizeIncrement, 20, \
2301 "Adaptive size percentage change in tenured generation") \
2302 range(0, 100) \
2303 \
2304 product(uintx, TenuredGenerationSizeSupplement, 80, \
2305 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2306 range(0, 100) \
2307 \
2308 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2309 "Decay factor to TenuredGenerationSizeIncrement") \
2310 range(1, max_uintx) \
2311 \
2312 product(uintx, MaxGCPauseMillis, max_uintx, \
2313 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2314 "or (G1 Only) the maximum GC time per MMU time slice") \
2315 \
2316 product(uintx, GCPauseIntervalMillis, 0, \
2317 "Time slice for MMU specification") \
2318 \
2319 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2320 "Adaptive size policy maximum GC minor pause time goal " \
2321 "in millisecond") \
2322 \
2323 product(uintx, GCTimeRatio, 99, \
2324 "Adaptive size policy application time to GC time ratio") \
2325 \
2326 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2327 "Adaptive size scale down factor for shrinking") \
2328 range(1, max_uintx) \
2329 \
2330 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2331 "Adaptive size decays the major cost for long major intervals") \
2332 \
2333 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2334 "Time scale over which major costs decay") \
2335 \
2336 product(uintx, MinSurvivorRatio, 3, \
2337 "Minimum ratio of young generation/survivor space size") \
2338 \
2339 product(uintx, InitialSurvivorRatio, 8, \
2340 "Initial ratio of young generation/survivor space size") \
2341 \
2342 product(size_t, BaseFootPrintEstimate, 256*M, \
2343 "Estimate of footprint other than Java Heap") \
2344 \
2345 product(bool, UseGCOverheadLimit, true, \
2346 "Use policy to limit of proportion of time spent in GC " \
2347 "before an OutOfMemory error is thrown") \
2348 \
2349 product(uintx, GCTimeLimit, 98, \
2350 "Limit of the proportion of time spent in GC before " \
2351 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2352 range(0, 100) \
2353 \
2354 product(uintx, GCHeapFreeLimit, 2, \
2355 "Minimum percentage of free space after a full GC before an " \
2356 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2357 range(0, 100) \
2358 \
2359 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2360 "Number of consecutive collections before gc time limit fires") \
2361 \
2362 product(bool, PrintAdaptiveSizePolicy, false, \
2363 "Print information about AdaptiveSizePolicy") \
2364 \
2365 product(intx, PrefetchCopyIntervalInBytes, -1, \
2366 "How far ahead to prefetch destination area (<= 0 means off)") \
2367 \
2368 product(intx, PrefetchScanIntervalInBytes, -1, \
2369 "How far ahead to prefetch scan area (<= 0 means off)") \
2370 \
2371 product(intx, PrefetchFieldsAhead, -1, \
2372 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2373 \
2374 diagnostic(bool, VerifySilently, false, \
2375 "Do not print the verification progress") \
2376 \
2377 diagnostic(bool, VerifyDuringStartup, false, \
2378 "Verify memory system before executing any Java code " \
2379 "during VM initialization") \
2380 \
2381 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2382 "Verify system before exiting") \
2383 \
2384 diagnostic(bool, VerifyBeforeGC, false, \
2385 "Verify memory system before GC") \
2386 \
2387 diagnostic(bool, VerifyAfterGC, false, \
2388 "Verify memory system after GC") \
2389 \
2390 diagnostic(bool, VerifyDuringGC, false, \
2391 "Verify memory system during GC (between phases)") \
2392 \
2393 diagnostic(bool, GCParallelVerificationEnabled, true, \
2394 "Enable parallel memory system verification") \
2395 \
2396 diagnostic(bool, DeferInitialCardMark, false, \
2397 "When +ReduceInitialCardMarks, explicitly defer any that " \
2398 "may arise from new_pre_store_barrier") \
2399 \
2400 product(bool, UseCondCardMark, false, \
2401 "Check for already marked card before updating card table") \
2402 \
2403 diagnostic(bool, VerifyRememberedSets, false, \
2404 "Verify GC remembered sets") \
2405 \
2406 diagnostic(bool, VerifyObjectStartArray, true, \
2407 "Verify GC object start array if verify before/after") \
2408 \
2409 product(bool, DisableExplicitGC, false, \
2410 "Ignore calls to System.gc()") \
2411 \
2412 notproduct(bool, CheckMemoryInitialization, false, \
2413 "Check memory initialization") \
2414 \
2415 diagnostic(bool, BindCMSThreadToCPU, false, \
2416 "Bind CMS Thread to CPU if possible") \
2417 \
2418 diagnostic(uintx, CPUForCMSThread, 0, \
2419 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2420 \
2421 product(bool, BindGCTaskThreadsToCPUs, false, \
2422 "Bind GCTaskThreads to CPUs if possible") \
2423 \
2424 product(bool, UseGCTaskAffinity, false, \
2425 "Use worker affinity when asking for GCTasks") \
2426 \
2427 product(uintx, ProcessDistributionStride, 4, \
2428 "Stride through processors when distributing processes") \
2429 \
2430 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2431 "Number of times the coordinator GC thread will sleep while " \
2432 "yielding before giving up and resuming GC") \
2433 \
2434 product(uintx, CMSYieldSleepCount, 0, \
2435 "Number of times a GC thread (minus the coordinator) " \
2436 "will sleep while yielding before giving up and resuming GC") \
2437 \
2438 /* gc tracing */ \
2439 manageable(bool, PrintGC, false, \
2440 "Print message at garbage collection") \
2441 \
2442 manageable(bool, PrintGCDetails, false, \
2443 "Print more details at garbage collection") \
2444 \
2445 manageable(bool, PrintGCDateStamps, false, \
2446 "Print date stamps at garbage collection") \
2447 \
2448 manageable(bool, PrintGCTimeStamps, false, \
2449 "Print timestamps at garbage collection") \
2450 \
2451 manageable(bool, PrintGCID, true, \
2452 "Print an identifier for each garbage collection") \
2453 \
2454 product(bool, PrintGCTaskTimeStamps, false, \
2455 "Print timestamps for individual gc worker thread tasks") \
2456 \
2457 develop(intx, ConcGCYieldTimeout, 0, \
2458 "If non-zero, assert that GC threads yield within this " \
2459 "number of milliseconds") \
2460 \
2461 product(bool, PrintReferenceGC, false, \
2462 "Print times spent handling reference objects during GC " \
2463 "(enabled only when PrintGCDetails)") \
2464 \
2465 develop(bool, TraceReferenceGC, false, \
2466 "Trace handling of soft/weak/final/phantom references") \
2467 \
2468 develop(bool, TraceFinalizerRegistration, false, \
2469 "Trace registration of final references") \
2470 \
2471 notproduct(bool, TraceScavenge, false, \
2472 "Trace scavenge") \
2473 \
2474 product(bool, IgnoreEmptyClassPaths, false, \
2475 "Ignore empty path elements in -classpath") \
2476 \
2477 product(bool, TraceClassPaths, false, \
2478 "Trace processing of class paths") \
2479 \
2480 product_rw(bool, TraceClassLoading, false, \
2481 "Trace all classes loaded") \
2482 \
2483 product(bool, TraceClassLoadingPreorder, false, \
2484 "Trace all classes loaded in order referenced (not loaded)") \
2485 \
2486 product_rw(bool, TraceClassUnloading, false, \
2487 "Trace unloading of classes") \
2488 \
2489 product_rw(bool, TraceLoaderConstraints, false, \
2490 "Trace loader constraints") \
2491 \
2492 develop(bool, TraceClassLoaderData, false, \
2493 "Trace class loader loader_data lifetime") \
2494 \
2495 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2496 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2497 "Initial size of the boot class loader data metaspace") \
2498 \
2499 product(bool, TraceYoungGenTime, false, \
2500 "Trace accumulated time for young collection") \
2501 \
2502 product(bool, TraceOldGenTime, false, \
2503 "Trace accumulated time for old collection") \
2504 \
2505 product(bool, PrintTenuringDistribution, false, \
2506 "Print tenuring age information") \
2507 \
2508 product_rw(bool, PrintHeapAtGC, false, \
2509 "Print heap layout before and after each GC") \
2510 \
2511 product_rw(bool, PrintHeapAtGCExtended, false, \
2512 "Print extended information about the layout of the heap " \
2513 "when -XX:+PrintHeapAtGC is set") \
2514 \
2515 product(bool, PrintHeapAtSIGBREAK, true, \
2516 "Print heap layout in response to SIGBREAK") \
2517 \
2518 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2519 "Print a class histogram before any major stop-world GC") \
2520 \
2521 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2522 "Print a class histogram after any major stop-world GC") \
2523 \
2524 manageable(bool, PrintClassHistogram, false, \
2525 "Print a histogram of class instances") \
2526 \
2527 develop(bool, TraceWorkGang, false, \
2528 "Trace activities of work gangs") \
2529 \
2530 product(bool, TraceParallelOldGCTasks, false, \
2531 "Trace multithreaded GC activity") \
2532 \
2533 develop(bool, TraceBlockOffsetTable, false, \
2534 "Print BlockOffsetTable maps") \
2535 \
2536 develop(bool, TraceCardTableModRefBS, false, \
2537 "Print CardTableModRefBS maps") \
2538 \
2539 develop(bool, TraceGCTaskManager, false, \
2540 "Trace actions of the GC task manager") \
2541 \
2542 develop(bool, TraceGCTaskQueue, false, \
2543 "Trace actions of the GC task queues") \
2544 \
2545 diagnostic(bool, TraceGCTaskThread, false, \
2546 "Trace actions of the GC task threads") \
2547 \
2548 product(bool, PrintParallelOldGCPhaseTimes, false, \
2549 "Print the time taken by each phase in ParallelOldGC " \
2550 "(PrintGCDetails must also be enabled)") \
2551 \
2552 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2553 "Trace marking phase in ParallelOldGC") \
2554 \
2555 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2556 "Trace summary phase in ParallelOldGC") \
2557 \
2558 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2559 "Trace compaction phase in ParallelOldGC") \
2560 \
2561 develop(bool, TraceParallelOldGCDensePrefix, false, \
2562 "Trace dense prefix computation for ParallelOldGC") \
2563 \
2564 develop(bool, IgnoreLibthreadGPFault, false, \
2565 "Suppress workaround for libthread GP fault") \
2566 \
2567 product(bool, PrintJNIGCStalls, false, \
2568 "Print diagnostic message when GC is stalled " \
2569 "by JNI critical section") \
2570 \
2571 experimental(double, ObjectCountCutOffPercent, 0.5, \
2572 "The percentage of the used heap that the instances of a class " \
2573 "must occupy for the class to generate a trace event") \
2574 \
2575 /* GC log rotation setting */ \
2576 \
2577 product(bool, UseGCLogFileRotation, false, \
2578 "Rotate gclog files (for long running applications). It requires "\
2579 "-Xloggc:<filename>") \
2580 \
2581 product(uintx, NumberOfGCLogFiles, 0, \
2582 "Number of gclog files in rotation " \
2583 "(default: 0, no rotation)") \
2584 \
2585 product(size_t, GCLogFileSize, 8*K, \
2586 "GC log file size, requires UseGCLogFileRotation. " \
2587 "Set to 0 to only trigger rotation via jcmd") \
2588 \
2589 /* JVMTI heap profiling */ \
2590 \
2591 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2592 "Trace JVMTI object tagging calls") \
2593 \
2594 diagnostic(bool, VerifyBeforeIteration, false, \
2595 "Verify memory system before JVMTI iteration") \
2596 \
2597 /* compiler interface */ \
2598 \
2599 develop(bool, CIPrintCompilerName, false, \
2600 "when CIPrint is active, print the name of the active compiler") \
2601 \
2602 diagnostic(bool, CIPrintCompileQueue, false, \
2603 "display the contents of the compile queue whenever a " \
2604 "compilation is enqueued") \
2605 \
2606 develop(bool, CIPrintRequests, false, \
2607 "display every request for compilation") \
2608 \
2609 product(bool, CITime, false, \
2610 "collect timing information for compilation") \
2611 \
2612 develop(bool, CITimeVerbose, false, \
2613 "be more verbose in compilation timings") \
2614 \
2615 develop(bool, CITimeEach, false, \
2616 "display timing information after each successful compilation") \
2617 \
2618 develop(bool, CICountOSR, false, \
2619 "use a separate counter when assigning ids to osr compilations") \
2620 \
2621 develop(bool, CICompileNatives, true, \
2622 "compile native methods if supported by the compiler") \
2623 \
2624 develop_pd(bool, CICompileOSR, \
2625 "compile on stack replacement methods if supported by the " \
2626 "compiler") \
2627 \
2628 develop(bool, CIPrintMethodCodes, false, \
2629 "print method bytecodes of the compiled code") \
2630 \
2631 develop(bool, CIPrintTypeFlow, false, \
2632 "print the results of ciTypeFlow analysis") \
2633 \
2634 develop(bool, CITraceTypeFlow, false, \
2635 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2636 \
2637 develop(intx, OSROnlyBCI, -1, \
2638 "OSR only at this bci. Negative values mean exclude that bci") \
2639 \
2640 /* compiler */ \
2641 \
2642 /* notice: the max range value here is max_jint, not max_intx */ \
2643 /* because of overflow issue */ \
2644 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2645 "Number of compiler threads to run") \
2646 range(0, max_jint) \
2647 constraint(CICompilerCountConstraintFunc, AtParse) \
2648 \
2649 product(intx, CompilationPolicyChoice, 0, \
2650 "which compilation policy (0-3)") \
2651 range(0, 3) \
2652 \
2653 develop(bool, UseStackBanging, true, \
2654 "use stack banging for stack overflow checks (required for " \
2655 "proper StackOverflow handling; disable only to measure cost " \
2656 "of stackbanging)") \
2657 \
2658 develop(bool, UseStrictFP, true, \
2659 "use strict fp if modifier strictfp is set") \
2660 \
2661 develop(bool, GenerateSynchronizationCode, true, \
2662 "generate locking/unlocking code for synchronized methods and " \
2663 "monitors") \
2664 \
2665 develop(bool, GenerateCompilerNullChecks, true, \
2666 "Generate explicit null checks for loads/stores/calls") \
2667 \
2668 develop(bool, GenerateRangeChecks, true, \
2669 "Generate range checks for array accesses") \
2670 \
2671 develop_pd(bool, ImplicitNullChecks, \
2672 "Generate code for implicit null checks") \
2673 \
2674 product_pd(bool, TrapBasedNullChecks, \
2675 "Generate code for null checks that uses a cmp and trap " \
2676 "instruction raising SIGTRAP. This is only used if an access to" \
2677 "null (+offset) will not raise a SIGSEGV, i.e.," \
2678 "ImplicitNullChecks don't work (PPC64).") \
2679 \
2680 product(bool, PrintSafepointStatistics, false, \
2681 "Print statistics about safepoint synchronization") \
2682 \
2683 product(intx, PrintSafepointStatisticsCount, 300, \
2684 "Total number of safepoint statistics collected " \
2685 "before printing them out") \
2686 \
2687 product(intx, PrintSafepointStatisticsTimeout, -1, \
2688 "Print safepoint statistics only when safepoint takes " \
2689 "more than PrintSafepointSatisticsTimeout in millis") \
2690 \
2691 product(bool, TraceSafepointCleanupTime, false, \
2692 "Print the break down of clean up tasks performed during " \
2693 "safepoint") \
2694 \
2695 product(bool, Inline, true, \
2696 "Enable inlining") \
2697 \
2698 product(bool, ClipInlining, true, \
2699 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2700 \
2701 develop(bool, UseCHA, true, \
2702 "Enable CHA") \
2703 \
2704 product(bool, UseTypeProfile, true, \
2705 "Check interpreter profile for historically monomorphic calls") \
2706 \
2707 diagnostic(bool, PrintInlining, false, \
2708 "Print inlining optimizations") \
2709 \
2710 product(bool, UsePopCountInstruction, false, \
2711 "Use population count instruction") \
2712 \
2713 develop(bool, EagerInitialization, false, \
2714 "Eagerly initialize classes if possible") \
2715 \
2716 diagnostic(bool, LogTouchedMethods, false, \
2717 "Log methods which have been ever touched in runtime") \
2718 \
2719 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2720 "Print all methods that have been ever touched in runtime") \
2721 \
2722 develop(bool, TraceMethodReplacement, false, \
2723 "Print when methods are replaced do to recompilation") \
2724 \
2725 develop(bool, PrintMethodFlushing, false, \
2726 "Print the nmethods being flushed") \
2727 \
2728 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2729 "print statistics about method flushing") \
2730 \
2731 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2732 "Number of compiled code invocations after which " \
2733 "the method is considered as hot by the flusher") \
2734 \
2735 diagnostic(intx, MinPassesBeforeFlush, 10, \
2736 "Minimum number of sweeper passes before an nmethod " \
2737 "can be flushed") \
2738 \
2739 product(bool, UseCodeAging, true, \
2740 "Insert counter to detect warm methods") \
2741 \
2742 diagnostic(bool, StressCodeAging, false, \
2743 "Start with counters compiled in") \
2744 \
2745 develop(bool, UseRelocIndex, false, \
2746 "Use an index to speed random access to relocations") \
2747 \
2748 develop(bool, StressCodeBuffers, false, \
2749 "Exercise code buffer expansion and other rare state changes") \
2750 \
2751 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2752 "Generate extra debugging information for non-safepoints in " \
2753 "nmethods") \
2754 \
2755 product(bool, PrintVMOptions, false, \
2756 "Print flags that appeared on the command line") \
2757 \
2758 product(bool, IgnoreUnrecognizedVMOptions, false, \
2759 "Ignore unrecognized VM options") \
2760 \
2761 product(bool, PrintCommandLineFlags, false, \
2762 "Print flags specified on command line or set by ergonomics") \
2763 \
2764 product(bool, PrintFlagsInitial, false, \
2765 "Print all VM flags before argument processing and exit VM") \
2766 \
2767 product(bool, PrintFlagsFinal, false, \
2768 "Print all VM flags after argument and ergonomic processing") \
2769 \
2770 notproduct(bool, PrintFlagsWithComments, false, \
2771 "Print all VM flags with default values and descriptions and " \
2772 "exit") \
2773 \
2774 product(bool, PrintFlagsRanges, false, \
2775 "Print VM flags and their ranges and exit VM") \
2776 \
2777 diagnostic(bool, SerializeVMOutput, true, \
2778 "Use a mutex to serialize output to tty and LogFile") \
2779 \
2780 diagnostic(bool, DisplayVMOutput, true, \
2781 "Display all VM output on the tty, independently of LogVMOutput") \
2782 \
2783 diagnostic(bool, LogVMOutput, false, \
2784 "Save VM output to LogFile") \
2785 \
2786 diagnostic(ccstr, LogFile, NULL, \
2787 "If LogVMOutput or LogCompilation is on, save VM output to " \
2788 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2789 \
2790 product(ccstr, ErrorFile, NULL, \
2791 "If an error occurs, save the error data to this file " \
2792 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2793 \
2794 product(bool, DisplayVMOutputToStderr, false, \
2795 "If DisplayVMOutput is true, display all VM output to stderr") \
2796 \
2797 product(bool, DisplayVMOutputToStdout, false, \
2798 "If DisplayVMOutput is true, display all VM output to stdout") \
2799 \
2800 product(bool, UseHeavyMonitors, false, \
2801 "use heavyweight instead of lightweight Java monitors") \
2802 \
2803 product(bool, PrintStringTableStatistics, false, \
2804 "print statistics about the StringTable and SymbolTable") \
2805 \
2806 diagnostic(bool, VerifyStringTableAtExit, false, \
2807 "verify StringTable contents at exit") \
2808 \
2809 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2810 "print histogram of the symbol table") \
2811 \
2812 notproduct(bool, ExitVMOnVerifyError, false, \
2813 "standard exit from VM if bytecode verify error " \
2814 "(only in debug mode)") \
2815 \
2816 notproduct(ccstr, AbortVMOnException, NULL, \
2817 "Call fatal if this exception is thrown. Example: " \
2818 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2819 \
2820 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2821 "Call fatal if the exception pointed by AbortVMOnException " \
2822 "has this message") \
2823 \
2824 develop(bool, DebugVtables, false, \
2825 "add debugging code to vtable dispatch") \
2826 \
2827 develop(bool, PrintVtables, false, \
2828 "print vtables when printing klass") \
2829 \
2830 notproduct(bool, PrintVtableStats, false, \
2831 "print vtables stats at end of run") \
2832 \
2833 develop(bool, TraceCreateZombies, false, \
2834 "trace creation of zombie nmethods") \
2835 \
2836 notproduct(bool, IgnoreLockingAssertions, false, \
2837 "disable locking assertions (for speed)") \
2838 \
2839 product(bool, RangeCheckElimination, true, \
2840 "Eliminate range checks") \
2841 \
2842 develop_pd(bool, UncommonNullCast, \
2843 "track occurrences of null in casts; adjust compiler tactics") \
2844 \
2845 develop(bool, TypeProfileCasts, true, \
2846 "treat casts like calls for purposes of type profiling") \
2847 \
2848 develop(bool, DelayCompilationDuringStartup, true, \
2849 "Delay invoking the compiler until main application class is " \
2850 "loaded") \
2851 \
2852 develop(bool, CompileTheWorld, false, \
2853 "Compile all methods in all classes in bootstrap class path " \
2854 "(stress test)") \
2855 \
2856 develop(bool, CompileTheWorldPreloadClasses, true, \
2857 "Preload all classes used by a class before start loading") \
2858 \
2859 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2860 "Force a safepoint every n compiles so sweeper can keep up") \
2861 \
2862 develop(bool, FillDelaySlots, true, \
2863 "Fill delay slots (on SPARC only)") \
2864 \
2865 develop(bool, TimeLivenessAnalysis, false, \
2866 "Time computation of bytecode liveness analysis") \
2867 \
2868 develop(bool, TraceLivenessGen, false, \
2869 "Trace the generation of liveness analysis information") \
2870 \
2871 notproduct(bool, TraceLivenessQuery, false, \
2872 "Trace queries of liveness analysis information") \
2873 \
2874 notproduct(bool, CollectIndexSetStatistics, false, \
2875 "Collect information about IndexSets") \
2876 \
2877 develop(bool, UseLoopSafepoints, true, \
2878 "Generate Safepoint nodes in every loop") \
2879 \
2880 develop(intx, FastAllocateSizeLimit, 128*K, \
2881 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2882 "Inline allocations larger than this in doublewords must go slow")\
2883 \
2884 product(bool, AggressiveOpts, false, \
2885 "Enable aggressive optimizations - see arguments.cpp") \
2886 \
2887 product_pd(uintx, TypeProfileLevel, \
2888 "=XYZ, with Z: Type profiling of arguments at call; " \
2889 "Y: Type profiling of return value at call; " \
2890 "X: Type profiling of parameters to methods; " \
2891 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2892 \
2893 product(intx, TypeProfileArgsLimit, 2, \
2894 "max number of call arguments to consider for type profiling") \
2895 \
2896 product(intx, TypeProfileParmsLimit, 2, \
2897 "max number of incoming parameters to consider for type profiling"\
2898 ", -1 for all") \
2899 \
2900 /* statistics */ \
2901 develop(bool, CountCompiledCalls, false, \
2902 "Count method invocations") \
2903 \
2904 notproduct(bool, CountRuntimeCalls, false, \
2905 "Count VM runtime calls") \
2906 \
2907 develop(bool, CountJNICalls, false, \
2908 "Count jni method invocations") \
2909 \
2910 notproduct(bool, CountJVMCalls, false, \
2911 "Count jvm method invocations") \
2912 \
2913 notproduct(bool, CountRemovableExceptions, false, \
2914 "Count exceptions that could be replaced by branches due to " \
2915 "inlining") \
2916 \
2917 notproduct(bool, ICMissHistogram, false, \
2918 "Produce histogram of IC misses") \
2919 \
2920 /* interpreter */ \
2921 develop(bool, ClearInterpreterLocals, false, \
2922 "Always clear local variables of interpreter activations upon " \
2923 "entry") \
2924 \
2925 product_pd(bool, RewriteBytecodes, \
2926 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2927 \
2928 product_pd(bool, RewriteFrequentPairs, \
2929 "Rewrite frequently used bytecode pairs into a single bytecode") \
2930 \
2931 diagnostic(bool, PrintInterpreter, false, \
2932 "Print the generated interpreter code") \
2933 \
2934 product(bool, UseInterpreter, true, \
2935 "Use interpreter for non-compiled methods") \
2936 \
2937 develop(bool, UseFastSignatureHandlers, true, \
2938 "Use fast signature handlers for native calls") \
2939 \
2940 product(bool, UseLoopCounter, true, \
2941 "Increment invocation counter on backward branch") \
2942 \
2943 product_pd(bool, UseOnStackReplacement, \
2944 "Use on stack replacement, calls runtime if invoc. counter " \
2945 "overflows in loop") \
2946 \
2947 notproduct(bool, TraceOnStackReplacement, false, \
2948 "Trace on stack replacement") \
2949 \
2950 product_pd(bool, PreferInterpreterNativeStubs, \
2951 "Use always interpreter stubs for native methods invoked via " \
2952 "interpreter") \
2953 \
2954 develop(bool, CountBytecodes, false, \
2955 "Count number of bytecodes executed") \
2956 \
2957 develop(bool, PrintBytecodeHistogram, false, \
2958 "Print histogram of the executed bytecodes") \
2959 \
2960 develop(bool, PrintBytecodePairHistogram, false, \
2961 "Print histogram of the executed bytecode pairs") \
2962 \
2963 diagnostic(bool, PrintSignatureHandlers, false, \
2964 "Print code generated for native method signature handlers") \
2965 \
2966 develop(bool, VerifyOops, false, \
2967 "Do plausibility checks for oops") \
2968 \
2969 develop(bool, CheckUnhandledOops, false, \
2970 "Check for unhandled oops in VM code") \
2971 \
2972 develop(bool, VerifyJNIFields, trueInDebug, \
2973 "Verify jfieldIDs for instance fields") \
2974 \
2975 notproduct(bool, VerifyJNIEnvThread, false, \
2976 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2977 "from JNI") \
2978 \
2979 develop(bool, VerifyFPU, false, \
2980 "Verify FPU state (check for NaN's, etc.)") \
2981 \
2982 develop(bool, VerifyThread, false, \
2983 "Watch the thread register for corruption (SPARC only)") \
2984 \
2985 develop(bool, VerifyActivationFrameSize, false, \
2986 "Verify that activation frame didn't become smaller than its " \
2987 "minimal size") \
2988 \
2989 develop(bool, TraceFrequencyInlining, false, \
2990 "Trace frequency based inlining") \
2991 \
2992 develop_pd(bool, InlineIntrinsics, \
2993 "Inline intrinsics that can be statically resolved") \
2994 \
2995 product_pd(bool, ProfileInterpreter, \
2996 "Profile at the bytecode level during interpretation") \
2997 \
2998 develop(bool, TraceProfileInterpreter, false, \
2999 "Trace profiling at the bytecode level during interpretation. " \
3000 "This outputs the profiling information collected to improve " \
3001 "jit compilation.") \
3002 \
3003 develop_pd(bool, ProfileTraps, \
3004 "Profile deoptimization traps at the bytecode level") \
3005 \
3006 product(intx, ProfileMaturityPercentage, 20, \
3007 "number of method invocations/branches (expressed as % of " \
3008 "CompileThreshold) before using the method's profile") \
3009 range(0, 100) \
3010 \
3011 diagnostic(bool, PrintMethodData, false, \
3012 "Print the results of +ProfileInterpreter at end of run") \
3013 \
3014 develop(bool, VerifyDataPointer, trueInDebug, \
3015 "Verify the method data pointer during interpreter profiling") \
3016 \
3017 develop(bool, VerifyCompiledCode, false, \
3018 "Include miscellaneous runtime verifications in nmethod code; " \
3019 "default off because it disturbs nmethod size heuristics") \
3020 \
3021 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3022 "Manually make GC thread crash then dump java stack trace; " \
3023 "Test only") \
3024 \
3025 /* compilation */ \
3026 product(bool, UseCompiler, true, \
3027 "Use Just-In-Time compilation") \
3028 \
3029 develop(bool, TraceCompilationPolicy, false, \
3030 "Trace compilation policy") \
3031 \
3032 develop(bool, TimeCompilationPolicy, false, \
3033 "Time the compilation policy") \
3034 \
3035 product(bool, UseCounterDecay, true, \
3036 "Adjust recompilation counters") \
3037 \
3038 develop(intx, CounterHalfLifeTime, 30, \
3039 "Half-life time of invocation counters (in seconds)") \
3040 \
3041 develop(intx, CounterDecayMinIntervalLength, 500, \
3042 "The minimum interval (in milliseconds) between invocation of " \
3043 "CounterDecay") \
3044 \
3045 product(bool, AlwaysCompileLoopMethods, false, \
3046 "When using recompilation, never interpret methods " \
3047 "containing loops") \
3048 \
3049 product(bool, DontCompileHugeMethods, true, \
3050 "Do not compile methods > HugeMethodLimit") \
3051 \
3052 /* Bytecode escape analysis estimation. */ \
3053 product(bool, EstimateArgEscape, true, \
3054 "Analyze bytecodes to estimate escape state of arguments") \
3055 \
3056 product(intx, BCEATraceLevel, 0, \
3057 "How much tracing to do of bytecode escape analysis estimates") \
3058 \
3059 product(intx, MaxBCEAEstimateLevel, 5, \
3060 "Maximum number of nested calls that are analyzed by BC EA") \
3061 \
3062 product(intx, MaxBCEAEstimateSize, 150, \
3063 "Maximum bytecode size of a method to be analyzed by BC EA") \
3064 \
3065 product(intx, AllocatePrefetchStyle, 1, \
3066 "0 = no prefetch, " \
3067 "1 = prefetch instructions for each allocation, " \
3068 "2 = use TLAB watermark to gate allocation prefetch, " \
3069 "3 = use BIS instruction on Sparc for allocation prefetch") \
3070 range(0, 3) \
3071 \
3072 product(intx, AllocatePrefetchDistance, -1, \
3073 "Distance to prefetch ahead of allocation pointer") \
3074 \
3075 product(intx, AllocatePrefetchLines, 3, \
3076 "Number of lines to prefetch ahead of array allocation pointer") \
3077 \
3078 product(intx, AllocateInstancePrefetchLines, 1, \
3079 "Number of lines to prefetch ahead of instance allocation " \
3080 "pointer") \
3081 \
3082 product(intx, AllocatePrefetchStepSize, 16, \
3083 "Step size in bytes of sequential prefetch instructions") \
3084 \
3085 product(intx, AllocatePrefetchInstr, 0, \
3086 "Prefetch instruction to prefetch ahead of allocation pointer") \
3087 \
3088 /* deoptimization */ \
3089 develop(bool, TraceDeoptimization, false, \
3090 "Trace deoptimization") \
3091 \
3092 develop(bool, DebugDeoptimization, false, \
3093 "Tracing various information while debugging deoptimization") \
3094 \
3095 product(intx, SelfDestructTimer, 0, \
3096 "Will cause VM to terminate after a given time (in minutes) " \
3097 "(0 means off)") \
3098 \
3099 product(intx, MaxJavaStackTraceDepth, 1024, \
3100 "The maximum number of lines in the stack trace for Java " \
3101 "exceptions (0 means all)") \
3102 \
3103 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3104 "Guarantee a safepoint (at least) every so many milliseconds " \
3105 "(0 means none)")) \
3106 \
3107 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3108 "Guarantee a safepoint (at least) every so many milliseconds " \
3109 "(0 means none)")) \
3110 \
3111 product(intx, SafepointTimeoutDelay, 10000, \
3112 "Delay in milliseconds for option SafepointTimeout") \
3113 \
3114 product(intx, NmethodSweepActivity, 10, \
3115 "Removes cold nmethods from code cache if > 0. Higher values " \
3116 "result in more aggressive sweeping") \
3117 range(0, 2000) \
3118 \
3119 notproduct(bool, LogSweeper, false, \
3120 "Keep a ring buffer of sweeper activity") \
3121 \
3122 notproduct(intx, SweeperLogEntries, 1024, \
3123 "Number of records in the ring buffer of sweeper activity") \
3124 \
3125 notproduct(intx, MemProfilingInterval, 500, \
3126 "Time between each invocation of the MemProfiler") \
3127 \
3128 develop(intx, MallocCatchPtr, -1, \
3129 "Hit breakpoint when mallocing/freeing this pointer") \
3130 \
3131 notproduct(ccstrlist, SuppressErrorAt, "", \
3132 "List of assertions (file:line) to muzzle") \
3133 \
3134 notproduct(size_t, HandleAllocationLimit, 1024, \
3135 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3136 "is used") \
3137 \
3138 develop(size_t, TotalHandleAllocationLimit, 1024, \
3139 "Threshold for total handle allocation when " \
3140 "+TraceHandleAllocation is used") \
3141 \
3142 develop(intx, StackPrintLimit, 100, \
3143 "number of stack frames to print in VM-level stack dump") \
3144 \
3145 notproduct(intx, MaxElementPrintSize, 256, \
3146 "maximum number of elements to print") \
3147 \
3148 notproduct(intx, MaxSubklassPrintSize, 4, \
3149 "maximum number of subklasses to print when printing klass") \
3150 \
3151 product(intx, MaxInlineLevel, 9, \
3152 "maximum number of nested calls that are inlined") \
3153 \
3154 product(intx, MaxRecursiveInlineLevel, 1, \
3155 "maximum number of nested recursive calls that are inlined") \
3156 \
3157 develop(intx, MaxForceInlineLevel, 100, \
3158 "maximum number of nested calls that are forced for inlining " \
3159 "(using CompilerOracle or marked w/ @ForceInline)") \
3160 \
3161 product_pd(intx, InlineSmallCode, \
3162 "Only inline already compiled methods if their code size is " \
3163 "less than this") \
3164 \
3165 product(intx, MaxInlineSize, 35, \
3166 "The maximum bytecode size of a method to be inlined") \
3167 \
3168 product_pd(intx, FreqInlineSize, \
3169 "The maximum bytecode size of a frequent method to be inlined") \
3170 \
3171 product(intx, MaxTrivialSize, 6, \
3172 "The maximum bytecode size of a trivial method to be inlined") \
3173 \
3174 product(intx, MinInliningThreshold, 250, \
3175 "The minimum invocation count a method needs to have to be " \
3176 "inlined") \
3177 \
3178 develop(intx, MethodHistogramCutoff, 100, \
3179 "The cutoff value for method invocation histogram (+CountCalls)") \
3180 \
3181 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3182 "Number of interpreted methods to show in profile") \
3183 \
3184 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3185 "Number of compiled methods to show in profile") \
3186 \
3187 develop(intx, ProfilerNumberOfStubMethods, 25, \
3188 "Number of stub methods to show in profile") \
3189 \
3190 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3191 "Number of runtime stub nodes to show in profile") \
3192 \
3193 product(intx, ProfileIntervalsTicks, 100, \
3194 "Number of ticks between printing of interval profile " \
3195 "(+ProfileIntervals)") \
3196 \
3197 notproduct(intx, ScavengeALotInterval, 1, \
3198 "Interval between which scavenge will occur with +ScavengeALot") \
3199 \
3200 notproduct(intx, FullGCALotInterval, 1, \
3201 "Interval between which full gc will occur with +FullGCALot") \
3202 \
3203 notproduct(intx, FullGCALotStart, 0, \
3204 "For which invocation to start FullGCAlot") \
3205 \
3206 notproduct(intx, FullGCALotDummies, 32*K, \
3207 "Dummy object allocated with +FullGCALot, forcing all objects " \
3208 "to move") \
3209 \
3210 develop(intx, DontYieldALotInterval, 10, \
3211 "Interval between which yields will be dropped (milliseconds)") \
3212 \
3213 develop(intx, MinSleepInterval, 1, \
3214 "Minimum sleep() interval (milliseconds) when " \
3215 "ConvertSleepToYield is off (used for Solaris)") \
3216 \
3217 develop(intx, ProfilerPCTickThreshold, 15, \
3218 "Number of ticks in a PC buckets to be a hotspot") \
3219 \
3220 notproduct(intx, DeoptimizeALotInterval, 5, \
3221 "Number of exits until DeoptimizeALot kicks in") \
3222 \
3223 notproduct(intx, ZombieALotInterval, 5, \
3224 "Number of exits until ZombieALot kicks in") \
3225 \
3226 diagnostic(intx, MallocVerifyInterval, 0, \
3227 "If non-zero, verify C heap after every N calls to " \
3228 "malloc/realloc/free") \
3229 \
3230 diagnostic(intx, MallocVerifyStart, 0, \
3231 "If non-zero, start verifying C heap after Nth call to " \
3232 "malloc/realloc/free") \
3233 \
3234 diagnostic(uintx, MallocMaxTestWords, 0, \
3235 "If non-zero, maximum number of words that malloc/realloc can " \
3236 "allocate (for testing only)") \
3237 \
3238 product(intx, TypeProfileWidth, 2, \
3239 "Number of receiver types to record in call/cast profile") \
3240 \
3241 develop(intx, BciProfileWidth, 2, \
3242 "Number of return bci's to record in ret profile") \
3243 \
3244 product(intx, PerMethodRecompilationCutoff, 400, \
3245 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3246 range(-1, max_intx) \
3247 \
3248 product(intx, PerBytecodeRecompilationCutoff, 200, \
3249 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3250 range(-1, max_intx) \
3251 \
3252 product(intx, PerMethodTrapLimit, 100, \
3253 "Limit on traps (of one kind) in a method (includes inlines)") \
3254 \
3255 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3256 "Limit on speculative traps (of one kind) in a method " \
3257 "(includes inlines)") \
3258 \
3259 product(intx, PerBytecodeTrapLimit, 4, \
3260 "Limit on traps (of one kind) at a particular BCI") \
3261 \
3262 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3263 "Extra method data trap entries for speculation") \
3264 \
3265 develop(intx, InlineFrequencyRatio, 20, \
3266 "Ratio of call site execution to caller method invocation") \
3267 \
3268 develop_pd(intx, InlineFrequencyCount, \
3269 "Count of call site execution necessary to trigger frequent " \
3270 "inlining") \
3271 \
3272 develop(intx, InlineThrowCount, 50, \
3273 "Force inlining of interpreted methods that throw this often") \
3274 \
3275 develop(intx, InlineThrowMaxSize, 200, \
3276 "Force inlining of throwing methods smaller than this") \
3277 \
3278 develop(intx, ProfilerNodeSize, 1024, \
3279 "Size in K to allocate for the Profile Nodes of each thread") \
3280 \
3281 /* gc parameters */ \
3282 product(size_t, InitialHeapSize, 0, \
3283 "Initial heap size (in bytes); zero means use ergonomics") \
3284 \
3285 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3286 "Maximum heap size (in bytes)") \
3287 \
3288 product(size_t, OldSize, ScaleForWordSize(4*M), \
3289 "Initial tenured generation size (in bytes)") \
3290 \
3291 product(size_t, NewSize, ScaleForWordSize(1*M), \
3292 "Initial new generation size (in bytes)") \
3293 \
3294 product(size_t, MaxNewSize, max_uintx, \
3295 "Maximum new generation size (in bytes), max_uintx means set " \
3296 "ergonomically") \
3297 \
3298 product(size_t, PretenureSizeThreshold, 0, \
3299 "Maximum size in bytes of objects allocated in DefNew " \
3300 "generation; zero means no maximum") \
3301 \
3302 product(size_t, TLABSize, 0, \
3303 "Starting TLAB size (in bytes); zero means set ergonomically") \
3304 \
3305 product(size_t, MinTLABSize, 2*K, \
3306 "Minimum allowed TLAB size (in bytes)") \
3307 range(1, max_uintx) \
3308 \
3309 product(uintx, TLABAllocationWeight, 35, \
3310 "Allocation averaging weight") \
3311 range(0, 100) \
3312 \
3313 /* Limit the lower bound of this flag to 1 as it is used */ \
3314 /* in a division expression. */ \
3315 product(uintx, TLABWasteTargetPercent, 1, \
3316 "Percentage of Eden that can be wasted") \
3317 range(1, 100) \
3318 \
3319 product(uintx, TLABRefillWasteFraction, 64, \
3320 "Maximum TLAB waste at a refill (internal fragmentation)") \
3321 range(1, max_uintx) \
3322 \
3323 product(uintx, TLABWasteIncrement, 4, \
3324 "Increment allowed waste at slow allocation") \
3325 \
3326 product(uintx, SurvivorRatio, 8, \
3327 "Ratio of eden/survivor space size") \
3328 \
3329 product(uintx, NewRatio, 2, \
3330 "Ratio of old/new generation sizes") \
3331 \
3332 product_pd(size_t, NewSizeThreadIncrease, \
3333 "Additional size added to desired new generation size per " \
3334 "non-daemon thread (in bytes)") \
3335 \
3336 product_pd(size_t, MetaspaceSize, \
3337 "Initial size of Metaspaces (in bytes)") \
3338 \
3339 product(size_t, MaxMetaspaceSize, max_uintx, \
3340 "Maximum size of Metaspaces (in bytes)") \
3341 \
3342 product(size_t, CompressedClassSpaceSize, 1*G, \
3343 "Maximum size of class area in Metaspace when compressed " \
3344 "class pointers are used") \
3345 range(1*M, 3*G) \
3346 \
3347 manageable(uintx, MinHeapFreeRatio, 40, \
3348 "The minimum percentage of heap free after GC to avoid expansion."\
3349 " For most GCs this applies to the old generation. In G1 and" \
3350 " ParallelGC it applies to the whole heap.") \
3351 range(0, 100) \
3352 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3353 \
3354 manageable(uintx, MaxHeapFreeRatio, 70, \
3355 "The maximum percentage of heap free after GC to avoid shrinking."\
3356 " For most GCs this applies to the old generation. In G1 and" \
3357 " ParallelGC it applies to the whole heap.") \
3358 range(0, 100) \
3359 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3360 \
3361 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3362 "Number of milliseconds per MB of free space in the heap") \
3363 \
3364 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3365 "The minimum change in heap space due to GC (in bytes)") \
3366 \
3367 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3368 "The minimum expansion of Metaspace (in bytes)") \
3369 \
3370 product(uintx, MaxMetaspaceFreeRatio, 70, \
3371 "The maximum percentage of Metaspace free after GC to avoid " \
3372 "shrinking") \
3373 range(0, 100) \
3374 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3375 \
3376 product(uintx, MinMetaspaceFreeRatio, 40, \
3377 "The minimum percentage of Metaspace free after GC to avoid " \
3378 "expansion") \
3379 range(0, 99) \
3380 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3381 \
3382 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3383 "The maximum expansion of Metaspace without full GC (in bytes)") \
3384 \
3385 product(uintx, QueuedAllocationWarningCount, 0, \
3386 "Number of times an allocation that queues behind a GC " \
3387 "will retry before printing a warning") \
3388 \
3389 diagnostic(uintx, VerifyGCStartAt, 0, \
3390 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3391 \
3392 diagnostic(intx, VerifyGCLevel, 0, \
3393 "Generation level at which to start +VerifyBefore/AfterGC") \
3394 \
3395 product(uintx, MaxTenuringThreshold, 15, \
3396 "Maximum value for tenuring threshold") \
3397 range(0, markOopDesc::max_age + 1) \
3398 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3399 \
3400 product(uintx, InitialTenuringThreshold, 7, \
3401 "Initial value for tenuring threshold") \
3402 range(0, markOopDesc::max_age + 1) \
3403 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3404 \
3405 product(uintx, TargetSurvivorRatio, 50, \
3406 "Desired percentage of survivor space used after scavenge") \
3407 range(0, 100) \
3408 \
3409 product(uintx, MarkSweepDeadRatio, 5, \
3410 "Percentage (0-100) of the old gen allowed as dead wood. " \
3411 "Serial mark sweep treats this as both the minimum and maximum " \
3412 "value. " \
3413 "CMS uses this value only if it falls back to mark sweep. " \
3414 "Par compact uses a variable scale based on the density of the " \
3415 "generation and treats this as the maximum value when the heap " \
3416 "is either completely full or completely empty. Par compact " \
3417 "also has a smaller default value; see arguments.cpp.") \
3418 range(0, 100) \
3419 \
3420 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3421 "How often should we fully compact the heap (ignoring the dead " \
3422 "space parameters)") \
3423 range(1, max_uintx) \
3424 \
3425 product(intx, PrintCMSStatistics, 0, \
3426 "Statistics for CMS") \
3427 \
3428 product(bool, PrintCMSInitiationStatistics, false, \
3429 "Statistics for initiating a CMS collection") \
3430 \
3431 product(intx, PrintFLSStatistics, 0, \
3432 "Statistics for CMS' FreeListSpace") \
3433 \
3434 product(intx, PrintFLSCensus, 0, \
3435 "Census for CMS' FreeListSpace") \
3436 \
3437 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3438 "Delay between expansion and allocation (in milliseconds)") \
3439 \
3440 develop(uintx, GCWorkerDelayMillis, 0, \
3441 "Delay in scheduling GC workers (in milliseconds)") \
3442 \
3443 product(intx, DeferThrSuspendLoopCount, 4000, \
3444 "(Unstable) Number of times to iterate in safepoint loop " \
3445 "before blocking VM threads ") \
3446 \
3447 product(intx, DeferPollingPageLoopCount, -1, \
3448 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3449 "before changing safepoint polling page to RO ") \
3450 \
3451 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3452 \
3453 product(bool, PSChunkLargeArrays, true, \
3454 "Process large arrays in chunks") \
3455 \
3456 product(uintx, GCDrainStackTargetSize, 64, \
3457 "Number of entries we will try to leave on the stack " \
3458 "during parallel gc") \
3459 \
3460 /* stack parameters */ \
3461 product_pd(intx, StackYellowPages, \
3462 "Number of yellow zone (recoverable overflows) pages") \
3463 range(1, max_intx) \
3464 \
3465 product_pd(intx, StackRedPages, \
3466 "Number of red zone (unrecoverable overflows) pages") \
3467 range(1, max_intx) \
3468 \
3469 /* greater stack shadow pages can't generate instruction to bang stack */ \
3470 product_pd(intx, StackShadowPages, \
3471 "Number of shadow zone (for overflow checking) pages " \
3472 "this should exceed the depth of the VM and native call stack") \
3473 range(1, 50) \
3474 \
3475 product_pd(intx, ThreadStackSize, \
3476 "Thread Stack Size (in Kbytes)") \
3477 \
3478 product_pd(intx, VMThreadStackSize, \
3479 "Non-Java Thread Stack Size (in Kbytes)") \
3480 \
3481 product_pd(intx, CompilerThreadStackSize, \
3482 "Compiler Thread Stack Size (in Kbytes)") \
3483 \
3484 develop_pd(size_t, JVMInvokeMethodSlack, \
3485 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3486 \
3487 /* code cache parameters */ \
3488 /* ppc64/tiered compilation has large code-entry alignment. */ \
3489 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3490 "Code cache segment size (in bytes) - smallest unit of " \
3491 "allocation") \
3492 range(1, 1024) \
3493 \
3494 develop_pd(intx, CodeEntryAlignment, \
3495 "Code entry alignment for generated code (in bytes)") \
3496 \
3497 product_pd(intx, OptoLoopAlignment, \
3498 "Align inner loops to zero relative to this modulus") \
3499 \
3500 product_pd(uintx, InitialCodeCacheSize, \
3501 "Initial code cache size (in bytes)") \
3502 \
3503 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3504 "Minimum code cache size (in bytes) required to start VM.") \
3505 \
3506 product(bool, SegmentedCodeCache, false, \
3507 "Use a segmented code cache") \
3508 \
3509 product_pd(uintx, ReservedCodeCacheSize, \
3510 "Reserved code cache size (in bytes) - maximum code cache size") \
3511 \
3512 product_pd(uintx, NonProfiledCodeHeapSize, \
3513 "Size of code heap with non-profiled methods (in bytes)") \
3514 \
3515 product_pd(uintx, ProfiledCodeHeapSize, \
3516 "Size of code heap with profiled methods (in bytes)") \
3517 \
3518 product_pd(uintx, NonNMethodCodeHeapSize, \
3519 "Size of code heap with non-nmethods (in bytes)") \
3520 \
3521 product_pd(uintx, CodeCacheExpansionSize, \
3522 "Code cache expansion size (in bytes)") \
3523 \
3524 develop_pd(uintx, CodeCacheMinBlockLength, \
3525 "Minimum number of segments in a code cache block") \
3526 range(1, 100) \
3527 \
3528 notproduct(bool, ExitOnFullCodeCache, false, \
3529 "Exit the VM if we fill the code cache") \
3530 \
3531 product(bool, UseCodeCacheFlushing, true, \
3532 "Remove cold/old nmethods from the code cache") \
3533 \
3534 product(uintx, StartAggressiveSweepingAt, 10, \
3535 "Start aggressive sweeping if X[%] of the code cache is free." \
3536 "Segmented code cache: X[%] of the non-profiled heap." \
3537 "Non-segmented code cache: X[%] of the total code cache") \
3538 range(0, 100) \
3539 \
3540 /* interpreter debugging */ \
3541 develop(intx, BinarySwitchThreshold, 5, \
3542 "Minimal number of lookupswitch entries for rewriting to binary " \
3543 "switch") \
3544 \
3545 develop(intx, StopInterpreterAt, 0, \
3546 "Stop interpreter execution at specified bytecode number") \
3547 \
3548 develop(intx, TraceBytecodesAt, 0, \
3549 "Trace bytecodes starting with specified bytecode number") \
3550 \
3551 /* compiler interface */ \
3552 develop(intx, CIStart, 0, \
3553 "The id of the first compilation to permit") \
3554 \
3555 develop(intx, CIStop, max_jint, \
3556 "The id of the last compilation to permit") \
3557 \
3558 develop(intx, CIStartOSR, 0, \
3559 "The id of the first osr compilation to permit " \
3560 "(CICountOSR must be on)") \
3561 \
3562 develop(intx, CIStopOSR, max_jint, \
3563 "The id of the last osr compilation to permit " \
3564 "(CICountOSR must be on)") \
3565 \
3566 develop(intx, CIBreakAtOSR, -1, \
3567 "The id of osr compilation to break at") \
3568 \
3569 develop(intx, CIBreakAt, -1, \
3570 "The id of compilation to break at") \
3571 \
3572 product(ccstrlist, CompileOnly, "", \
3573 "List of methods (pkg/class.name) to restrict compilation to") \
3574 \
3575 product(ccstr, CompileCommandFile, NULL, \
3576 "Read compiler commands from this file [.hotspot_compiler]") \
3577 \
3578 product(ccstrlist, CompileCommand, "", \
3579 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3580 \
3581 develop(bool, ReplayCompiles, false, \
3582 "Enable replay of compilations from ReplayDataFile") \
3583 \
3584 product(ccstr, ReplayDataFile, NULL, \
3585 "File containing compilation replay information" \
3586 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3587 \
3588 product(ccstr, InlineDataFile, NULL, \
3589 "File containing inlining replay information" \
3590 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3591 \
3592 develop(intx, ReplaySuppressInitializers, 2, \
3593 "Control handling of class initialization during replay: " \
3594 "0 - don't do anything special; " \
3595 "1 - treat all class initializers as empty; " \
3596 "2 - treat class initializers for application classes as empty; " \
3597 "3 - allow all class initializers to run during bootstrap but " \
3598 " pretend they are empty after starting replay") \
3599 range(0, 3) \
3600 \
3601 develop(bool, ReplayIgnoreInitErrors, false, \
3602 "Ignore exceptions thrown during initialization for replay") \
3603 \
3604 product(bool, DumpReplayDataOnError, true, \
3605 "Record replay data for crashing compiler threads") \
3606 \
3607 product(bool, CICompilerCountPerCPU, false, \
3608 "1 compiler thread for log(N CPUs)") \
3609 \
3610 develop(intx, CIFireOOMAt, -1, \
3611 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3612 "(non-negative value throws OOM after this many CI accesses " \
3613 "in each compile)") \
3614 notproduct(intx, CICrashAt, -1, \
3615 "id of compilation to trigger assert in compiler thread for " \
3616 "the purpose of testing, e.g. generation of replay data") \
3617 notproduct(bool, CIObjectFactoryVerify, false, \
3618 "enable potentially expensive verification in ciObjectFactory") \
3619 \
3620 /* Priorities */ \
3621 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3622 \
3623 product(intx, ThreadPriorityPolicy, 0, \
3624 "0 : Normal. "\
3625 " VM chooses priorities that are appropriate for normal "\
3626 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3627 " to normal native priority. Java priorities below " \
3628 " NORM_PRIORITY map to lower native priority values. On "\
3629 " Windows applications are allowed to use higher native "\
3630 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3631 " not use the highest possible native priority, "\
3632 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3633 " system threads. On Linux thread priorities are ignored "\
3634 " because the OS does not support static priority in "\
3635 " SCHED_OTHER scheduling class which is the only choice for "\
3636 " non-root, non-realtime applications. "\
3637 "1 : Aggressive. "\
3638 " Java thread priorities map over to the entire range of "\
3639 " native thread priorities. Higher Java thread priorities map "\
3640 " to higher native thread priorities. This policy should be "\
3641 " used with care, as sometimes it can cause performance "\
3642 " degradation in the application and/or the entire system. On "\
3643 " Linux this policy requires root privilege.") \
3644 range(0, 1) \
3645 \
3646 product(bool, ThreadPriorityVerbose, false, \
3647 "Print priority changes") \
3648 \
3649 product(intx, CompilerThreadPriority, -1, \
3650 "The native priority at which compiler threads should run " \
3651 "(-1 means no change)") \
3652 \
3653 product(intx, VMThreadPriority, -1, \
3654 "The native priority at which the VM thread should run " \
3655 "(-1 means no change)") \
3656 \
3657 product(bool, CompilerThreadHintNoPreempt, true, \
3658 "(Solaris only) Give compiler threads an extra quanta") \
3659 \
3660 product(bool, VMThreadHintNoPreempt, false, \
3661 "(Solaris only) Give VM thread an extra quanta") \
3662 \
3663 product(intx, JavaPriority1_To_OSPriority, -1, \
3664 "Map Java priorities to OS priorities") \
3665 \
3666 product(intx, JavaPriority2_To_OSPriority, -1, \
3667 "Map Java priorities to OS priorities") \
3668 \
3669 product(intx, JavaPriority3_To_OSPriority, -1, \
3670 "Map Java priorities to OS priorities") \
3671 \
3672 product(intx, JavaPriority4_To_OSPriority, -1, \
3673 "Map Java priorities to OS priorities") \
3674 \
3675 product(intx, JavaPriority5_To_OSPriority, -1, \
3676 "Map Java priorities to OS priorities") \
3677 \
3678 product(intx, JavaPriority6_To_OSPriority, -1, \
3679 "Map Java priorities to OS priorities") \
3680 \
3681 product(intx, JavaPriority7_To_OSPriority, -1, \
3682 "Map Java priorities to OS priorities") \
3683 \
3684 product(intx, JavaPriority8_To_OSPriority, -1, \
3685 "Map Java priorities to OS priorities") \
3686 \
3687 product(intx, JavaPriority9_To_OSPriority, -1, \
3688 "Map Java priorities to OS priorities") \
3689 \
3690 product(intx, JavaPriority10_To_OSPriority,-1, \
3691 "Map Java priorities to OS priorities") \
3692 \
3693 experimental(bool, UseCriticalJavaThreadPriority, false, \
3694 "Java thread priority 10 maps to critical scheduling priority") \
3695 \
3696 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3697 "Compiler thread(s) run at critical scheduling priority") \
3698 \
3699 experimental(bool, UseCriticalCMSThreadPriority, false, \
3700 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3701 \
3702 /* compiler debugging */ \
3703 notproduct(intx, CompileTheWorldStartAt, 1, \
3704 "First class to consider when using +CompileTheWorld") \
3705 \
3706 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3707 "Last class to consider when using +CompileTheWorld") \
3708 \
3709 develop(intx, NewCodeParameter, 0, \
3710 "Testing Only: Create a dedicated integer parameter before " \
3711 "putback") \
3712 \
3713 /* new oopmap storage allocation */ \
3714 develop(intx, MinOopMapAllocation, 8, \
3715 "Minimum number of OopMap entries in an OopMapSet") \
3716 \
3717 /* Background Compilation */ \
3718 develop(intx, LongCompileThreshold, 50, \
3719 "Used with +TraceLongCompiles") \
3720 \
3721 /* recompilation */ \
3722 product_pd(intx, CompileThreshold, \
3723 "number of interpreted method invocations before (re-)compiling") \
3724 \
3725 product(double, CompileThresholdScaling, 1.0, \
3726 "Factor to control when first compilation happens " \
3727 "(both with and without tiered compilation): " \
3728 "values greater than 1.0 delay counter overflow, " \
3729 "values between 0 and 1.0 rush counter overflow, " \
3730 "value of 1.0 leaves compilation thresholds unchanged " \
3731 "value of 0.0 is equivalent to -Xint. " \
3732 "" \
3733 "Flag can be set as per-method option. " \
3734 "If a value is specified for a method, compilation thresholds " \
3735 "for that method are scaled by both the value of the global flag "\
3736 "and the value of the per-method flag.") \
3737 \
3738 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3739 "Interpreter (tier 0) invocation notification frequency") \
3740 \
3741 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3742 "C1 without MDO (tier 2) invocation notification frequency") \
3743 \
3744 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3745 "C1 with MDO profiling (tier 3) invocation notification " \
3746 "frequency") \
3747 \
3748 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3749 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3750 \
3751 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3752 "Interpreter (tier 0) invocation notification frequency") \
3753 \
3754 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3755 "C1 without MDO (tier 2) invocation notification frequency") \
3756 \
3757 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3758 "C1 with MDO profiling (tier 3) invocation notification " \
3759 "frequency") \
3760 \
3761 product(intx, Tier2CompileThreshold, 0, \
3762 "threshold at which tier 2 compilation is invoked") \
3763 \
3764 product(intx, Tier2BackEdgeThreshold, 0, \
3765 "Back edge threshold at which tier 2 compilation is invoked") \
3766 \
3767 product(intx, Tier3InvocationThreshold, 200, \
3768 "Compile if number of method invocations crosses this " \
3769 "threshold") \
3770 \
3771 product(intx, Tier3MinInvocationThreshold, 100, \
3772 "Minimum invocation to compile at tier 3") \
3773 \
3774 product(intx, Tier3CompileThreshold, 2000, \
3775 "Threshold at which tier 3 compilation is invoked (invocation " \
3776 "minimum must be satisfied") \
3777 \
3778 product(intx, Tier3BackEdgeThreshold, 60000, \
3779 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3780 \
3781 product(intx, Tier4InvocationThreshold, 5000, \
3782 "Compile if number of method invocations crosses this " \
3783 "threshold") \
3784 \
3785 product(intx, Tier4MinInvocationThreshold, 600, \
3786 "Minimum invocation to compile at tier 4") \
3787 \
3788 product(intx, Tier4CompileThreshold, 15000, \
3789 "Threshold at which tier 4 compilation is invoked (invocation " \
3790 "minimum must be satisfied") \
3791 \
3792 product(intx, Tier4BackEdgeThreshold, 40000, \
3793 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3794 \
3795 product(intx, Tier3DelayOn, 5, \
3796 "If C2 queue size grows over this amount per compiler thread " \
3797 "stop compiling at tier 3 and start compiling at tier 2") \
3798 \
3799 product(intx, Tier3DelayOff, 2, \
3800 "If C2 queue size is less than this amount per compiler thread " \
3801 "allow methods compiled at tier 2 transition to tier 3") \
3802 \
3803 product(intx, Tier3LoadFeedback, 5, \
3804 "Tier 3 thresholds will increase twofold when C1 queue size " \
3805 "reaches this amount per compiler thread") \
3806 \
3807 product(intx, Tier4LoadFeedback, 3, \
3808 "Tier 4 thresholds will increase twofold when C2 queue size " \
3809 "reaches this amount per compiler thread") \
3810 \
3811 product(intx, TieredCompileTaskTimeout, 50, \
3812 "Kill compile task if method was not used within " \
3813 "given timeout in milliseconds") \
3814 \
3815 product(intx, TieredStopAtLevel, 4, \
3816 "Stop at given compilation level") \
3817 \
3818 product(intx, Tier0ProfilingStartPercentage, 200, \
3819 "Start profiling in interpreter if the counters exceed tier 3 " \
3820 "thresholds by the specified percentage") \
3821 \
3822 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3823 "Increase the compile threshold for C1 compilation if the code " \
3824 "cache is filled by the specified percentage") \
3825 range(0, 99) \
3826 \
3827 product(intx, TieredRateUpdateMinTime, 1, \
3828 "Minimum rate sampling interval (in milliseconds)") \
3829 \
3830 product(intx, TieredRateUpdateMaxTime, 25, \
3831 "Maximum rate sampling interval (in milliseconds)") \
3832 \
3833 product_pd(bool, TieredCompilation, \
3834 "Enable tiered compilation") \
3835 \
3836 product(bool, PrintTieredEvents, false, \
3837 "Print tiered events notifications") \
3838 \
3839 product_pd(intx, OnStackReplacePercentage, \
3840 "NON_TIERED number of method invocations/branches (expressed as " \
3841 "% of CompileThreshold) before (re-)compiling OSR code") \
3842 \
3843 product(intx, InterpreterProfilePercentage, 33, \
3844 "NON_TIERED number of method invocations/branches (expressed as " \
3845 "% of CompileThreshold) before profiling in the interpreter") \
3846 range(0, 100) \
3847 \
3848 develop(intx, MaxRecompilationSearchLength, 10, \
3849 "The maximum number of frames to inspect when searching for " \
3850 "recompilee") \
3851 \
3852 develop(intx, MaxInterpretedSearchLength, 3, \
3853 "The maximum number of interpreted frames to skip when searching "\
3854 "for recompilee") \
3855 \
3856 develop(intx, DesiredMethodLimit, 8000, \
3857 "The desired maximum method size (in bytecodes) after inlining") \
3858 \
3859 develop(intx, HugeMethodLimit, 8000, \
3860 "Don't compile methods larger than this if " \
3861 "+DontCompileHugeMethods") \
3862 \
3863 /* New JDK 1.4 reflection implementation */ \
3864 \
3865 develop(intx, FastSuperclassLimit, 8, \
3866 "Depth of hardwired instanceof accelerator array") \
3867 \
3868 /* Properties for Java libraries */ \
3869 \
3870 product(size_t, MaxDirectMemorySize, 0, \
3871 "Maximum total size of NIO direct-buffer allocations") \
3872 \
3873 /* Flags used for temporary code during development */ \
3874 \
3875 diagnostic(bool, UseNewCode, false, \
3876 "Testing Only: Use the new version while testing") \
3877 \
3878 diagnostic(bool, UseNewCode2, false, \
3879 "Testing Only: Use the new version while testing") \
3880 \
3881 diagnostic(bool, UseNewCode3, false, \
3882 "Testing Only: Use the new version while testing") \
3883 \
3884 /* flags for performance data collection */ \
3885 \
3886 product(bool, UsePerfData, falseInEmbedded, \
3887 "Flag to disable jvmstat instrumentation for performance testing "\
3888 "and problem isolation purposes") \
3889 \
3890 product(bool, PerfDataSaveToFile, false, \
3891 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3892 \
3893 product(ccstr, PerfDataSaveFile, NULL, \
3894 "Save PerfData memory to the specified absolute pathname. " \
3895 "The string %p in the file name (if present) " \
3896 "will be replaced by pid") \
3897 \
3898 product(intx, PerfDataSamplingInterval, 50, \
3899 "Data sampling interval (in milliseconds)") \
3900 \
3901 develop(bool, PerfTraceDataCreation, false, \
3902 "Trace creation of Performance Data Entries") \
3903 \
3904 develop(bool, PerfTraceMemOps, false, \
3905 "Trace PerfMemory create/attach/detach calls") \
3906 \
3907 product(bool, PerfDisableSharedMem, false, \
3908 "Store performance data in standard memory") \
3909 \
3910 product(intx, PerfDataMemorySize, 64*K, \
3911 "Size of performance data memory region. Will be rounded " \
3912 "up to a multiple of the native os page size.") \
3913 \
3914 product(intx, PerfMaxStringConstLength, 1024, \
3915 "Maximum PerfStringConstant string length before truncation") \
3916 \
3917 product(bool, PerfAllowAtExitRegistration, false, \
3918 "Allow registration of atexit() methods") \
3919 \
3920 product(bool, PerfBypassFileSystemCheck, false, \
3921 "Bypass Win32 file system criteria checks (Windows Only)") \
3922 \
3923 product(intx, UnguardOnExecutionViolation, 0, \
3924 "Unguard page and retry on no-execute fault (Win32 only) " \
3925 "0=off, 1=conservative, 2=aggressive") \
3926 range(0, 2) \
3927 \
3928 /* Serviceability Support */ \
3929 \
3930 product(bool, ManagementServer, false, \
3931 "Create JMX Management Server") \
3932 \
3933 product(bool, DisableAttachMechanism, false, \
3934 "Disable mechanism that allows tools to attach to this VM") \
3935 \
3936 product(bool, StartAttachListener, false, \
3937 "Always start Attach Listener at VM startup") \
3938 \
3939 manageable(bool, PrintConcurrentLocks, false, \
3940 "Print java.util.concurrent locks in thread dump") \
3941 \
3942 product(bool, TransmitErrorReport, false, \
3943 "Enable error report transmission on erroneous termination") \
3944 \
3945 product(ccstr, ErrorReportServer, NULL, \
3946 "Override built-in error report server address") \
3947 \
3948 /* Shared spaces */ \
3949 \
3950 product(bool, UseSharedSpaces, true, \
3951 "Use shared spaces for metadata") \
3952 \
3953 product(bool, VerifySharedSpaces, false, \
3954 "Verify shared spaces (false for default archive, true for " \
3955 "archive specified by -XX:SharedArchiveFile)") \
3956 \
3957 product(bool, RequireSharedSpaces, false, \
3958 "Require shared spaces for metadata") \
3959 \
3960 product(bool, DumpSharedSpaces, false, \
3961 "Special mode: JVM reads a class list, loads classes, builds " \
3962 "shared spaces, and dumps the shared spaces to a file to be " \
3963 "used in future JVM runs") \
3964 \
3965 product(bool, PrintSharedSpaces, false, \
3966 "Print usage of shared spaces") \
3967 \
3968 product(bool, PrintSharedArchiveAndExit, false, \
3969 "Print shared archive file contents") \
3970 \
3971 product(bool, PrintSharedDictionary, false, \
3972 "If PrintSharedArchiveAndExit is true, also print the shared " \
3973 "dictionary") \
3974 \
3975 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3976 "Size of read-write space for metadata (in bytes)") \
3977 \
3978 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3979 "Size of read-only space for metadata (in bytes)") \
3980 \
3981 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3982 "Size of the shared miscellaneous data area (in bytes)") \
3983 \
3984 product(uintx, SharedMiscCodeSize, 120*K, \
3985 "Size of the shared miscellaneous code area (in bytes)") \
3986 \
3987 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3988 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3989 "Address to allocate shared memory region for class data") \
3990 \
3991 product(uintx, SharedSymbolTableBucketSize, 4, \
3992 "Average number of symbols per bucket in shared table") \
3993 \
3994 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
3995 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3996 "classes. Just exclude them from the shared dictionary.") \
3997 \
3998 diagnostic(bool, PrintMethodHandleStubs, false, \
3999 "Print generated stub code for method handles") \
4000 \
4001 develop(bool, TraceMethodHandles, false, \
4002 "trace internal method handle operations") \
4003 \
4004 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4005 "perform extra checks when constructing method handles") \
4006 \
4007 diagnostic(bool, ShowHiddenFrames, false, \
4008 "show method handle implementation frames (usually hidden)") \
4009 \
4010 experimental(bool, TrustFinalNonStaticFields, false, \
4011 "trust final non-static declarations for constant folding") \
4012 \
4013 diagnostic(bool, FoldStableValues, true, \
4014 "Optimize loads from stable fields (marked w/ @Stable)") \
4015 \
4016 develop(bool, TraceInvokeDynamic, false, \
4017 "trace internal invoke dynamic operations") \
4018 \
4019 diagnostic(bool, PauseAtStartup, false, \
4020 "Causes the VM to pause at startup time and wait for the pause " \
4021 "file to be removed (default: ./vm.paused.<pid>)") \
4022 \
4023 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4024 "The file to create and for whose removal to await when pausing " \
4025 "at startup. (default: ./vm.paused.<pid>)") \
4026 \
4027 diagnostic(bool, PauseAtExit, false, \
4028 "Pause and wait for keypress on exit if a debugger is attached") \
4029 \
4030 product(bool, ExtendedDTraceProbes, false, \
4031 "Enable performance-impacting dtrace probes") \
4032 \
4033 product(bool, DTraceMethodProbes, false, \
4034 "Enable dtrace probes for method-entry and method-exit") \
4035 \
4036 product(bool, DTraceAllocProbes, false, \
4037 "Enable dtrace probes for object allocation") \
4038 \
4039 product(bool, DTraceMonitorProbes, false, \
4040 "Enable dtrace probes for monitor events") \
4041 \
4042 product(bool, RelaxAccessControlCheck, false, \
4043 "Relax the access control checks in the verifier") \
4044 \
4045 product(uintx, StringTableSize, defaultStringTableSize, \
4046 "Number of buckets in the interned String table") \
4047 range(minimumStringTableSize, 111*defaultStringTableSize) \
4048 \
4049 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4050 "Number of buckets in the JVM internal Symbol table") \
4051 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4052 \
4053 product(bool, UseStringDeduplication, false, \
4054 "Use string deduplication") \
4055 \
4056 product(bool, PrintStringDeduplicationStatistics, false, \
4057 "Print string deduplication statistics") \
4058 \
4059 product(uintx, StringDeduplicationAgeThreshold, 3, \
4060 "A string must reach this age (or be promoted to an old region) " \
4061 "to be considered for deduplication") \
4062 range(1, markOopDesc::max_age) \
4063 \
4064 diagnostic(bool, StringDeduplicationResizeALot, false, \
4065 "Force table resize every time the table is scanned") \
4066 \
4067 diagnostic(bool, StringDeduplicationRehashALot, false, \
4068 "Force table rehash every time the table is scanned") \
4069 \
4070 develop(bool, TraceDefaultMethods, false, \
4071 "Trace the default method processing steps") \
4072 \
4073 diagnostic(bool, WhiteBoxAPI, false, \
4074 "Enable internal testing APIs") \
4075 \
4076 product(bool, PrintGCCause, true, \
4077 "Include GC cause in GC logging") \
4078 \
4079 experimental(intx, SurvivorAlignmentInBytes, 0, \
4080 "Default survivor space alignment in bytes") \
4081 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4082 \
4083 product(bool , AllowNonVirtualCalls, false, \
4084 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4085 \
4086 product(ccstr, DumpLoadedClassList, NULL, \
4087 "Dump the names all loaded classes, that could be stored into " \
4088 "the CDS archive, in the specified file") \
4089 \
4090 product(ccstr, SharedClassListFile, NULL, \
4091 "Override the default CDS class list") \
4092 \
4093 diagnostic(ccstr, SharedArchiveFile, NULL, \
4094 "Override the default location of the CDS archive file") \
4095 \
4096 product(ccstr, ExtraSharedClassListFile, NULL, \
4097 "Extra classlist for building the CDS archive file") \
4098 \
4099 experimental(size_t, ArrayAllocatorMallocLimit, \
4100 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4101 "Allocation less than this value will be allocated " \
4102 "using malloc. Larger allocations will use mmap.") \
4103 \
4104 experimental(bool, AlwaysAtomicAccesses, false, \
4105 "Accesses to all variables should always be atomic") \
4106 \
4107 product(bool, EnableTracing, false, \
4108 "Enable event-based tracing") \
4109 \
4110 product(bool, UseLockedTracing, false, \
4111 "Use locked-tracing when doing event-based tracing") \
4112 \
4113 diagnostic(bool, UseUnalignedAccesses, false, \
4114 "Use unaligned memory accesses in sun.misc.Unsafe") \
4115 \
4116 product_pd(bool, PreserveFramePointer, \
4117 "Use the FP register for holding the frame pointer " \
4118 "and not as a general purpose register.") \
4119 \
4120 diagnostic(bool, CheckIntrinsics, true, \
4121 "When a class C is loaded, check that " \
4122 "(1) all intrinsics defined by the VM for class C are present "\
4123 "in the loaded class file and are marked with the " \
4124 "@HotSpotIntrinsicCandidate annotation, that " \
4125 "(2) there is an intrinsic registered for all loaded methods " \
4126 "that are annotated with the @HotSpotIntrinsicCandidate " \
4127 "annotation, and that " \
4128 "(3) no orphan methods exist for class C (i.e., methods for " \
4129 "which the VM declares an intrinsic but that are not declared "\
4130 "in the loaded class C. " \
4131 "Check (3) is available only in debug builds.")
4132
4133 /*
4134 * Macros for factoring of globals
4135 */
4136
4137 // Interface macros
4138 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4139 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4140 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4141 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4142 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4143 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4144 #ifdef PRODUCT
4145 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4146 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4147 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4148 #else
4149 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4150 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4151 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4152 #endif // PRODUCT
4153 // Special LP64 flags, product only needed for now.
4154 #ifdef _LP64
4155 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4156 #else
4157 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4158 #endif // _LP64
4159
4160 // Implementation macros
4161 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4162 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4163 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4164 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4165 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4166 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4167 #ifdef PRODUCT
4168 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4169 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4170 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4171 #else
4172 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4173 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4174 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4175 #endif // PRODUCT
4176 #ifdef _LP64
4177 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4178 #else
4179 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4180 #endif // _LP64
4181
4182 // Only materialize src code for range checking when required, ignore otherwise
4183 #define IGNORE_RANGE(a, b)
4184 // Only materialize src code for contraint checking when required, ignore otherwise
4185 #define IGNORE_CONSTRAINT(func,type)
4186
4187 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4188 DECLARE_PD_DEVELOPER_FLAG, \
4189 DECLARE_PRODUCT_FLAG, \
4190 DECLARE_PD_PRODUCT_FLAG, \
4191 DECLARE_DIAGNOSTIC_FLAG, \
4192 DECLARE_EXPERIMENTAL_FLAG, \
4193 DECLARE_NOTPRODUCT_FLAG, \
4194 DECLARE_MANAGEABLE_FLAG, \
4195 DECLARE_PRODUCT_RW_FLAG, \
4196 DECLARE_LP64_PRODUCT_FLAG, \
4197 IGNORE_RANGE, \
4198 IGNORE_CONSTRAINT)
4199
4200 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4201 DECLARE_PD_DEVELOPER_FLAG, \
4202 DECLARE_PRODUCT_FLAG, \
4203 DECLARE_PD_PRODUCT_FLAG, \
4204 DECLARE_DIAGNOSTIC_FLAG, \
4205 DECLARE_NOTPRODUCT_FLAG, \
4206 IGNORE_RANGE, \
4207 IGNORE_CONSTRAINT)
4208
4209 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4210 DECLARE_PRODUCT_FLAG, \
4211 DECLARE_DIAGNOSTIC_FLAG, \
4212 DECLARE_EXPERIMENTAL_FLAG, \
4213 DECLARE_NOTPRODUCT_FLAG, \
4214 IGNORE_RANGE, \
4215 IGNORE_CONSTRAINT)
4216
4217 // Extensions
4218
4219 #include "runtime/globals_ext.hpp"
4220
4221 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP