1 /*
2 * Copyright (c) 1997, 2016, 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 #include <float.h> // for DBL_MAX
30
31 // use this for flags that are true per default in the tiered build
32 // but false in non-tiered builds, and vice versa
33 #ifdef TIERED
34 #define trueInTiered true
35 #define falseInTiered false
36 #else
37 #define trueInTiered false
38 #define falseInTiered true
39 #endif
40
41 #ifdef TARGET_ARCH_x86
42 # include "globals_x86.hpp"
43 #endif
44 #ifdef TARGET_ARCH_sparc
45 # include "globals_sparc.hpp"
46 #endif
47 #ifdef TARGET_ARCH_zero
48 # include "globals_zero.hpp"
49 #endif
50 #ifdef TARGET_ARCH_arm
51 # include "globals_arm.hpp"
52 #endif
53 #ifdef TARGET_ARCH_ppc
54 # include "globals_ppc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_aarch64
57 # include "globals_aarch64.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_linux
60 # include "globals_linux.hpp"
61 #endif
62 #ifdef TARGET_OS_FAMILY_solaris
63 # include "globals_solaris.hpp"
64 #endif
65 #ifdef TARGET_OS_FAMILY_windows
66 # include "globals_windows.hpp"
67 #endif
68 #ifdef TARGET_OS_FAMILY_aix
69 # include "globals_aix.hpp"
70 #endif
71 #ifdef TARGET_OS_FAMILY_bsd
72 # include "globals_bsd.hpp"
73 #endif
74 #ifdef TARGET_OS_ARCH_linux_x86
75 # include "globals_linux_x86.hpp"
76 #endif
77 #ifdef TARGET_OS_ARCH_linux_sparc
78 # include "globals_linux_sparc.hpp"
79 #endif
80 #ifdef TARGET_OS_ARCH_linux_zero
81 # include "globals_linux_zero.hpp"
82 #endif
83 #ifdef TARGET_OS_ARCH_solaris_x86
84 # include "globals_solaris_x86.hpp"
85 #endif
86 #ifdef TARGET_OS_ARCH_solaris_sparc
87 # include "globals_solaris_sparc.hpp"
88 #endif
89 #ifdef TARGET_OS_ARCH_windows_x86
90 # include "globals_windows_x86.hpp"
91 #endif
92 #ifdef TARGET_OS_ARCH_linux_arm
93 # include "globals_linux_arm.hpp"
94 #endif
95 #ifdef TARGET_OS_ARCH_linux_ppc
96 # include "globals_linux_ppc.hpp"
97 #endif
98 #ifdef TARGET_OS_ARCH_linux_aarch64
99 # include "globals_linux_aarch64.hpp"
100 #endif
101 #ifdef TARGET_OS_ARCH_aix_ppc
102 # include "globals_aix_ppc.hpp"
103 #endif
104 #ifdef TARGET_OS_ARCH_bsd_x86
105 # include "globals_bsd_x86.hpp"
106 #endif
107 #ifdef TARGET_OS_ARCH_bsd_zero
108 # include "globals_bsd_zero.hpp"
109 #endif
110 #ifdef COMPILER1
111 #ifdef TARGET_ARCH_x86
112 # include "c1_globals_x86.hpp"
113 #endif
114 #ifdef TARGET_ARCH_sparc
115 # include "c1_globals_sparc.hpp"
116 #endif
117 #ifdef TARGET_ARCH_arm
118 # include "c1_globals_arm.hpp"
119 #endif
120 #ifdef TARGET_ARCH_aarch64
121 # include "c1_globals_aarch64.hpp"
122 #endif
123 #ifdef TARGET_OS_FAMILY_linux
124 # include "c1_globals_linux.hpp"
125 #endif
126 #ifdef TARGET_OS_FAMILY_solaris
127 # include "c1_globals_solaris.hpp"
128 #endif
129 #ifdef TARGET_OS_FAMILY_windows
130 # include "c1_globals_windows.hpp"
131 #endif
132 #ifdef TARGET_OS_FAMILY_aix
133 # include "c1_globals_aix.hpp"
134 #endif
135 #ifdef TARGET_OS_FAMILY_bsd
136 # include "c1_globals_bsd.hpp"
137 #endif
138 #ifdef TARGET_ARCH_ppc
139 # include "c1_globals_ppc.hpp"
140 #endif
141 #endif
142 #ifdef COMPILER2
143 #ifdef TARGET_ARCH_x86
144 # include "c2_globals_x86.hpp"
145 #endif
146 #ifdef TARGET_ARCH_sparc
147 # include "c2_globals_sparc.hpp"
148 #endif
149 #ifdef TARGET_ARCH_arm
150 # include "c2_globals_arm.hpp"
151 #endif
152 #ifdef TARGET_ARCH_ppc
153 # include "c2_globals_ppc.hpp"
154 #endif
155 #ifdef TARGET_ARCH_aarch64
156 # include "c2_globals_aarch64.hpp"
157 #endif
158 #ifdef TARGET_OS_FAMILY_linux
159 # include "c2_globals_linux.hpp"
160 #endif
161 #ifdef TARGET_OS_FAMILY_solaris
162 # include "c2_globals_solaris.hpp"
163 #endif
164 #ifdef TARGET_OS_FAMILY_windows
165 # include "c2_globals_windows.hpp"
166 #endif
167 #ifdef TARGET_OS_FAMILY_aix
168 # include "c2_globals_aix.hpp"
169 #endif
170 #ifdef TARGET_OS_FAMILY_bsd
171 # include "c2_globals_bsd.hpp"
172 #endif
173 #endif
174 #ifdef SHARK
175 #ifdef TARGET_ARCH_zero
176 # include "shark_globals_zero.hpp"
177 #endif
178 #endif
179
180 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
181 define_pd_global(bool, BackgroundCompilation, false);
182 define_pd_global(bool, UseTLAB, false);
183 define_pd_global(bool, CICompileOSR, false);
184 define_pd_global(bool, UseTypeProfile, false);
185 define_pd_global(bool, UseOnStackReplacement, false);
186 define_pd_global(bool, InlineIntrinsics, false);
187 define_pd_global(bool, PreferInterpreterNativeStubs, true);
188 define_pd_global(bool, ProfileInterpreter, false);
189 define_pd_global(bool, ProfileTraps, false);
190 define_pd_global(bool, TieredCompilation, false);
191
192 define_pd_global(intx, CompileThreshold, 0);
193
194 define_pd_global(intx, OnStackReplacePercentage, 0);
195 define_pd_global(bool, ResizeTLAB, false);
196 define_pd_global(intx, FreqInlineSize, 0);
197 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
198 define_pd_global(intx, InlineClassNatives, true);
199 define_pd_global(intx, InlineUnsafeOps, true);
200 define_pd_global(intx, InitialCodeCacheSize, 160*K);
201 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
202 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
203 define_pd_global(intx, ProfiledCodeHeapSize, 0);
204 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
205
206 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
207 define_pd_global(intx, CodeCacheMinBlockLength, 1);
208 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
209 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
210 define_pd_global(bool, NeverActAsServerClassMachine, true);
211 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
212 #define CI_COMPILER_COUNT 0
213 #else
214
215 #if defined(COMPILER2) || INCLUDE_JVMCI
216 #define CI_COMPILER_COUNT 2
217 #else
218 #define CI_COMPILER_COUNT 1
219 #endif // COMPILER2 || INCLUDE_JVMCI
220
221 #endif // no compilers
222
223 // string type aliases used only in this file
224 typedef const char* ccstr;
225 typedef const char* ccstrlist; // represents string arguments which accumulate
226
227 struct Flag {
228 enum Flags {
229 // value origin
230 DEFAULT = 0,
231 COMMAND_LINE = 1,
232 ENVIRON_VAR = 2,
233 CONFIG_FILE = 3,
234 MANAGEMENT = 4,
235 ERGONOMIC = 5,
236 ATTACH_ON_DEMAND = 6,
237 INTERNAL = 7,
238
239 LAST_VALUE_ORIGIN = INTERNAL,
240 VALUE_ORIGIN_BITS = 4,
241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
242
243 // flag kind
244 KIND_PRODUCT = 1 << 4,
245 KIND_MANAGEABLE = 1 << 5,
246 KIND_DIAGNOSTIC = 1 << 6,
247 KIND_EXPERIMENTAL = 1 << 7,
248 KIND_NOT_PRODUCT = 1 << 8,
249 KIND_DEVELOP = 1 << 9,
250 KIND_PLATFORM_DEPENDENT = 1 << 10,
251 KIND_READ_WRITE = 1 << 11,
252 KIND_C1 = 1 << 12,
253 KIND_C2 = 1 << 13,
254 KIND_ARCH = 1 << 14,
255 KIND_SHARK = 1 << 15,
256 KIND_LP64_PRODUCT = 1 << 16,
257 KIND_COMMERCIAL = 1 << 17,
258 KIND_JVMCI = 1 << 18,
259
260 KIND_MASK = ~VALUE_ORIGIN_MASK
261 };
262
263 enum Error {
264 // no error
265 SUCCESS = 0,
266 // flag name is missing
267 MISSING_NAME,
268 // flag value is missing
269 MISSING_VALUE,
270 // error parsing the textual form of the value
271 WRONG_FORMAT,
272 // flag is not writeable
273 NON_WRITABLE,
274 // flag value is outside of its bounds
275 OUT_OF_BOUNDS,
276 // flag value violates its constraint
277 VIOLATES_CONSTRAINT,
278 // there is no flag with the given name
279 INVALID_FLAG,
280 // other, unspecified error related to setting the flag
281 ERR_OTHER
282 };
283
284 enum MsgType {
285 NONE = 0,
286 DIAGNOSTIC_FLAG_BUT_LOCKED,
287 EXPERIMENTAL_FLAG_BUT_LOCKED,
288 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
289 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
290 };
291
292 const char* _type;
293 const char* _name;
294 void* _addr;
295 NOT_PRODUCT(const char* _doc;)
296 Flags _flags;
297
298 // points to all Flags static array
299 static Flag* flags;
300
301 // number of flags
302 static size_t numFlags;
303
304 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
305 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
306 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
307
308 void check_writable();
309
310 bool is_bool() const;
311 bool get_bool() const;
312 void set_bool(bool value);
313
314 bool is_int() const;
315 int get_int() const;
316 void set_int(int value);
317
318 bool is_uint() const;
319 uint get_uint() const;
320 void set_uint(uint value);
321
322 bool is_intx() const;
323 intx get_intx() const;
324 void set_intx(intx value);
325
326 bool is_uintx() const;
327 uintx get_uintx() const;
328 void set_uintx(uintx value);
329
330 bool is_uint64_t() const;
331 uint64_t get_uint64_t() const;
332 void set_uint64_t(uint64_t value);
333
334 bool is_size_t() const;
335 size_t get_size_t() const;
336 void set_size_t(size_t value);
337
338 bool is_double() const;
339 double get_double() const;
340 void set_double(double value);
341
342 bool is_ccstr() const;
343 bool ccstr_accumulates() const;
344 ccstr get_ccstr() const;
345 void set_ccstr(ccstr value);
346
347 Flags get_origin();
348 void set_origin(Flags origin);
349
350 bool is_default();
351 bool is_ergonomic();
352 bool is_command_line();
353
354 bool is_product() const;
355 bool is_manageable() const;
356 bool is_diagnostic() const;
357 bool is_experimental() const;
358 bool is_notproduct() const;
359 bool is_develop() const;
360 bool is_read_write() const;
361 bool is_commercial() const;
362
363 bool is_constant_in_binary() const;
364
365 bool is_unlocker() const;
366 bool is_unlocked() const;
367 bool is_writeable() const;
368 bool is_external() const;
369
370 bool is_unlocker_ext() const;
371 bool is_unlocked_ext() const;
372 bool is_writeable_ext() const;
373 bool is_external_ext() const;
374
375 void unlock_diagnostic();
376
377 Flag::MsgType get_locked_message(char*, int) const;
378 void get_locked_message_ext(char*, int) const;
379
380 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
381 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
382 void print_kind(outputStream* st);
383 void print_as_flag(outputStream* st);
384
385 static const char* flag_error_str(Flag::Error error);
386 };
387
388 // debug flags control various aspects of the VM and are global accessible
389
390 // use FlagSetting to temporarily change some debug flag
391 // e.g. FlagSetting fs(DebugThisAndThat, true);
392 // restored to previous value upon leaving scope
393 class FlagSetting {
394 bool val;
395 bool* flag;
396 public:
397 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
398 ~FlagSetting() { *flag = val; }
399 };
400
401
402 class CounterSetting {
403 intx* counter;
404 public:
405 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
406 ~CounterSetting() { (*counter)--; }
407 };
408
409 class IntFlagSetting {
410 int val;
411 int* flag;
412 public:
413 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
414 ~IntFlagSetting() { *flag = val; }
415 };
416
417 class UIntFlagSetting {
418 uint val;
419 uint* flag;
420 public:
421 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
422 ~UIntFlagSetting() { *flag = val; }
423 };
424
425 class UIntXFlagSetting {
426 uintx val;
427 uintx* flag;
428 public:
429 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
430 ~UIntXFlagSetting() { *flag = val; }
431 };
432
433 class DoubleFlagSetting {
434 double val;
435 double* flag;
436 public:
437 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
438 ~DoubleFlagSetting() { *flag = val; }
439 };
440
441 class SizeTFlagSetting {
442 size_t val;
443 size_t* flag;
444 public:
445 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
446 ~SizeTFlagSetting() { *flag = val; }
447 };
448
449
450 class CommandLineFlags {
451 public:
452 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
453 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); }
454 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
455 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
456 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
457
458 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
459 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); }
460 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
461 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
462 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
463
464 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
465 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); }
466 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
467 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
468 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
469
470 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
471 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); }
472 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
473 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
474 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
475
476 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
477 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); }
478 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
479 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
480 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
481
482 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
483 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); }
484 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
485 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
486 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
487
488 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
489 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); }
490 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
491 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
492 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
493
494 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
495 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); }
496 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
497 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
498 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
499
500 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
501 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); }
502 // Contract: Flag will make private copy of the incoming value.
503 // Outgoing value is always malloc-ed, and caller MUST call free.
504 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
505 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
506
507 // Returns false if name is not a command line flag.
508 static bool wasSetOnCmdline(const char* name, bool* value);
509 static void printSetFlags(outputStream* out);
510
511 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
512 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
513
514 static void verify() PRODUCT_RETURN;
515 };
516
517 // use this for flags that are true by default in the debug version but
518 // false in the optimized version, and vice versa
519 #ifdef ASSERT
520 #define trueInDebug true
521 #define falseInDebug false
522 #else
523 #define trueInDebug false
524 #define falseInDebug true
525 #endif
526
527 // use this for flags that are true per default in the product build
528 // but false in development builds, and vice versa
529 #ifdef PRODUCT
530 #define trueInProduct true
531 #define falseInProduct false
532 #else
533 #define trueInProduct false
534 #define falseInProduct true
535 #endif
536
537 #ifdef JAVASE_EMBEDDED
538 #define falseInEmbedded false
539 #else
540 #define falseInEmbedded true
541 #endif
542
543 #define VALHALLA_PRESPECIALIZED_DIR "valhalla-prespecialized"
544
545 // develop flags are settable / visible only during development and are constant in the PRODUCT version
546 // product flags are always settable / visible
547 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
548
549 // A flag must be declared with one of the following types:
550 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
551 // The type "ccstr" is an alias for "const char*" and is used
552 // only in this file, because the macrology requires single-token type names.
553
554 // Note: Diagnostic options not meant for VM tuning or for product modes.
555 // They are to be used for VM quality assurance or field diagnosis
556 // of VM bugs. They are hidden so that users will not be encouraged to
557 // try them as if they were VM ordinary execution options. However, they
558 // are available in the product version of the VM. Under instruction
559 // from support engineers, VM customers can turn them on to collect
560 // diagnostic information about VM problems. To use a VM diagnostic
561 // option, you must first specify +UnlockDiagnosticVMOptions.
562 // (This master switch also affects the behavior of -Xprintflags.)
563 //
564 // experimental flags are in support of features that are not
565 // part of the officially supported product, but are available
566 // for experimenting with. They could, for example, be performance
567 // features that may not have undergone full or rigorous QA, but which may
568 // help performance in some cases and released for experimentation
569 // by the community of users and developers. This flag also allows one to
570 // be able to build a fully supported product that nonetheless also
571 // ships with some unsupported, lightly tested, experimental features.
572 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
573 // UnlockExperimentalVMOptions flag, which allows the control and
574 // modification of the experimental flags.
575 //
576 // Nota bene: neither diagnostic nor experimental options should be used casually,
577 // and they are not supported on production loads, except under explicit
578 // direction from support engineers.
579 //
580 // manageable flags are writeable external product flags.
581 // They are dynamically writeable through the JDK management interface
582 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
583 // These flags are external exported interface (see CCC). The list of
584 // manageable flags can be queried programmatically through the management
585 // interface.
586 //
587 // A flag can be made as "manageable" only if
588 // - the flag is defined in a CCC as an external exported interface.
589 // - the VM implementation supports dynamic setting of the flag.
590 // This implies that the VM must *always* query the flag variable
591 // and not reuse state related to the flag state at any given time.
592 // - you want the flag to be queried programmatically by the customers.
593 //
594 // product_rw flags are writeable internal product flags.
595 // They are like "manageable" flags but for internal/private use.
596 // The list of product_rw flags are internal/private flags which
597 // may be changed/removed in a future release. It can be set
598 // through the management interface to get/set value
599 // when the name of flag is supplied.
600 //
601 // A flag can be made as "product_rw" only if
602 // - the VM implementation supports dynamic setting of the flag.
603 // This implies that the VM must *always* query the flag variable
604 // and not reuse state related to the flag state at any given time.
605 //
606 // Note that when there is a need to support develop flags to be writeable,
607 // it can be done in the same way as product_rw.
608 //
609 // range is a macro that will expand to min and max arguments for range
610 // checking code if provided - see commandLineFlagRangeList.hpp
611 //
612 // constraint is a macro that will expand to custom function call
613 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
614 //
615
616 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
617 \
618 lp64_product(bool, UseCompressedOops, false, \
619 "Use 32-bit object references in 64-bit VM. " \
620 "lp64_product means flag is always constant in 32 bit VM") \
621 \
622 lp64_product(bool, UseCompressedClassPointers, false, \
623 "Use 32-bit class pointers in 64-bit VM. " \
624 "lp64_product means flag is always constant in 32 bit VM") \
625 \
626 notproduct(bool, CheckCompressedOops, true, \
627 "Generate checks in encoding/decoding code in debug VM") \
628 \
629 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
630 "Heap allocation steps through preferred address regions to find" \
631 " where it can allocate the heap. Number of steps to take per " \
632 "region.") \
633 range(1, max_uintx) \
634 \
635 diagnostic(bool, PrintCompressedOopsMode, false, \
636 "Print compressed oops base address and encoding mode") \
637 \
638 lp64_product(intx, ObjectAlignmentInBytes, 8, \
639 "Default object alignment in bytes, 8 is minimum") \
640 range(8, 256) \
641 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
642 \
643 product(bool, AssumeMP, false, \
644 "Instruct the VM to assume multiple processors are available") \
645 \
646 /* UseMembar is theoretically a temp flag used for memory barrier */ \
647 /* removal testing. It was supposed to be removed before FCS but has */ \
648 /* been re-added (see 6401008) */ \
649 product_pd(bool, UseMembar, \
650 "(Unstable) Issues membars on thread state transitions") \
651 \
652 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
653 "Clean the chunk pool asynchronously") \
654 \
655 experimental(bool, AlwaysSafeConstructors, false, \
656 "Force safe construction, as if all fields are final.") \
657 \
658 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
659 "Enable normal processing of flags relating to field diagnostics")\
660 \
661 experimental(bool, UnlockExperimentalVMOptions, false, \
662 "Enable normal processing of flags relating to experimental " \
663 "features") \
664 \
665 product(bool, JavaMonitorsInStackTrace, true, \
666 "Print information about Java monitor locks when the stacks are" \
667 "dumped") \
668 \
669 product_pd(bool, UseLargePages, \
670 "Use large page memory") \
671 \
672 product_pd(bool, UseLargePagesIndividualAllocation, \
673 "Allocate large pages individually for better affinity") \
674 \
675 develop(bool, LargePagesIndividualAllocationInjectError, false, \
676 "Fail large pages individual allocation") \
677 \
678 product(bool, UseLargePagesInMetaspace, false, \
679 "Use large page memory in metaspace. " \
680 "Only used if UseLargePages is enabled.") \
681 \
682 develop(bool, TracePageSizes, false, \
683 "Trace page size selection and usage") \
684 \
685 product(bool, UseNUMA, false, \
686 "Use NUMA if available") \
687 \
688 product(bool, UseNUMAInterleaving, false, \
689 "Interleave memory across NUMA nodes if available") \
690 \
691 product(size_t, NUMAInterleaveGranularity, 2*M, \
692 "Granularity to use for NUMA interleaving on Windows OS") \
693 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
694 \
695 product(bool, ForceNUMA, false, \
696 "Force NUMA optimizations on single-node/UMA systems") \
697 \
698 product(uintx, NUMAChunkResizeWeight, 20, \
699 "Percentage (0-100) used to weight the current sample when " \
700 "computing exponentially decaying average for " \
701 "AdaptiveNUMAChunkSizing") \
702 range(0, 100) \
703 \
704 product(size_t, NUMASpaceResizeRate, 1*G, \
705 "Do not reallocate more than this amount per collection") \
706 range(0, max_uintx) \
707 \
708 product(bool, UseAdaptiveNUMAChunkSizing, true, \
709 "Enable adaptive chunk sizing for NUMA") \
710 \
711 product(bool, NUMAStats, false, \
712 "Print NUMA stats in detailed heap information") \
713 \
714 product(uintx, NUMAPageScanRate, 256, \
715 "Maximum number of pages to include in the page scan procedure") \
716 range(0, max_uintx) \
717 \
718 product_pd(bool, NeedsDeoptSuspend, \
719 "True for register window machines (sparc/ia64)") \
720 \
721 product(intx, UseSSE, 99, \
722 "Highest supported SSE instructions set on x86/x64") \
723 range(0, 99) \
724 \
725 product(bool, UseAES, false, \
726 "Control whether AES instructions can be used on x86/x64") \
727 \
728 product(bool, UseSHA, false, \
729 "Control whether SHA instructions can be used " \
730 "on SPARC and on ARM") \
731 \
732 product(bool, UseGHASHIntrinsics, false, \
733 "Use intrinsics for GHASH versions of crypto") \
734 \
735 product(size_t, LargePageSizeInBytes, 0, \
736 "Large page size (0 to let VM choose the page size)") \
737 range(0, max_uintx) \
738 \
739 product(size_t, LargePageHeapSizeThreshold, 128*M, \
740 "Use large pages if maximum heap is at least this big") \
741 range(0, max_uintx) \
742 \
743 product(bool, ForceTimeHighResolution, false, \
744 "Using high time resolution (for Win32 only)") \
745 \
746 develop(bool, TracePcPatching, false, \
747 "Trace usage of frame::patch_pc") \
748 \
749 develop(bool, TraceJumps, false, \
750 "Trace assembly jumps in thread ring buffer") \
751 \
752 develop(bool, TraceRelocator, false, \
753 "Trace the bytecode relocator") \
754 \
755 develop(bool, TraceLongCompiles, false, \
756 "Print out every time compilation is longer than " \
757 "a given threshold") \
758 \
759 develop(bool, SafepointALot, false, \
760 "Generate a lot of safepoints. This works with " \
761 "GuaranteedSafepointInterval") \
762 \
763 product_pd(bool, BackgroundCompilation, \
764 "A thread requesting compilation is not blocked during " \
765 "compilation") \
766 \
767 product(bool, PrintVMQWaitTime, false, \
768 "Print out the waiting time in VM operation queue") \
769 \
770 develop(bool, TraceOopMapGeneration, false, \
771 "Show OopMapGeneration") \
772 \
773 product(bool, MethodFlushing, true, \
774 "Reclamation of zombie and not-entrant methods") \
775 \
776 develop(bool, VerifyStack, false, \
777 "Verify stack of each thread when it is entering a runtime call") \
778 \
779 diagnostic(bool, ForceUnreachable, false, \
780 "Make all non code cache addresses to be unreachable by " \
781 "forcing use of 64bit literal fixups") \
782 \
783 notproduct(bool, StressDerivedPointers, false, \
784 "Force scavenge when a derived pointer is detected on stack " \
785 "after rtm call") \
786 \
787 develop(bool, TraceDerivedPointers, false, \
788 "Trace traversal of derived pointers on stack") \
789 \
790 notproduct(bool, TraceCodeBlobStacks, false, \
791 "Trace stack-walk of codeblobs") \
792 \
793 product(bool, PrintJNIResolving, false, \
794 "Used to implement -v:jni") \
795 \
796 notproduct(bool, PrintRewrites, false, \
797 "Print methods that are being rewritten") \
798 \
799 product(bool, UseInlineCaches, true, \
800 "Use Inline Caches for virtual calls ") \
801 \
802 develop(bool, InlineArrayCopy, true, \
803 "Inline arraycopy native that is known to be part of " \
804 "base library DLL") \
805 \
806 develop(bool, InlineObjectHash, true, \
807 "Inline Object::hashCode() native that is known to be part " \
808 "of base library DLL") \
809 \
810 develop(bool, InlineNatives, true, \
811 "Inline natives that are known to be part of base library DLL") \
812 \
813 develop(bool, InlineMathNatives, true, \
814 "Inline SinD, CosD, etc.") \
815 \
816 develop(bool, InlineClassNatives, true, \
817 "Inline Class.isInstance, etc") \
818 \
819 develop(bool, InlineThreadNatives, true, \
820 "Inline Thread.currentThread, etc") \
821 \
822 develop(bool, InlineUnsafeOps, true, \
823 "Inline memory ops (native methods) from Unsafe") \
824 \
825 product(bool, CriticalJNINatives, true, \
826 "Check for critical JNI entry points") \
827 \
828 notproduct(bool, StressCriticalJNINatives, false, \
829 "Exercise register saving code in critical natives") \
830 \
831 product(bool, UseAESIntrinsics, false, \
832 "Use intrinsics for AES versions of crypto") \
833 \
834 product(bool, UseAESCTRIntrinsics, false, \
835 "Use intrinsics for the paralleled version of AES/CTR crypto") \
836 \
837 product(bool, UseSHA1Intrinsics, false, \
838 "Use intrinsics for SHA-1 crypto hash function. " \
839 "Requires that UseSHA is enabled.") \
840 \
841 product(bool, UseSHA256Intrinsics, false, \
842 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
843 "Requires that UseSHA is enabled.") \
844 \
845 product(bool, UseSHA512Intrinsics, false, \
846 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
847 "Requires that UseSHA is enabled.") \
848 \
849 product(bool, UseCRC32Intrinsics, false, \
850 "use intrinsics for java.util.zip.CRC32") \
851 \
852 product(bool, UseCRC32CIntrinsics, false, \
853 "use intrinsics for java.util.zip.CRC32C") \
854 \
855 product(bool, UseAdler32Intrinsics, false, \
856 "use intrinsics for java.util.zip.Adler32") \
857 \
858 product(bool, UseVectorizedMismatchIntrinsic, false, \
859 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
860 \
861 diagnostic(ccstrlist, DisableIntrinsic, "", \
862 "do not expand intrinsics whose (internal) names appear here") \
863 \
864 develop(bool, TraceCallFixup, false, \
865 "Trace all call fixups") \
866 \
867 develop(bool, DeoptimizeALot, false, \
868 "Deoptimize at every exit from the runtime system") \
869 \
870 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
871 "A comma separated list of bcis to deoptimize at") \
872 \
873 product(bool, DeoptimizeRandom, false, \
874 "Deoptimize random frames on random exit from the runtime system")\
875 \
876 notproduct(bool, ZombieALot, false, \
877 "Create zombies (non-entrant) at exit from the runtime system") \
878 \
879 product(bool, UnlinkSymbolsALot, false, \
880 "Unlink unreferenced symbols from the symbol table at safepoints")\
881 \
882 notproduct(bool, WalkStackALot, false, \
883 "Trace stack (no print) at every exit from the runtime system") \
884 \
885 product(bool, Debugging, false, \
886 "Set when executing debug methods in debug.cpp " \
887 "(to prevent triggering assertions)") \
888 \
889 notproduct(bool, StrictSafepointChecks, trueInDebug, \
890 "Enable strict checks that safepoints cannot happen for threads " \
891 "that use NoSafepointVerifier") \
892 \
893 notproduct(bool, VerifyLastFrame, false, \
894 "Verify oops on last frame on entry to VM") \
895 \
896 develop(bool, TraceHandleAllocation, false, \
897 "Print out warnings when suspiciously many handles are allocated")\
898 \
899 product(bool, FailOverToOldVerifier, true, \
900 "Fail over to old verifier when split verifier fails") \
901 \
902 develop(bool, ShowSafepointMsgs, false, \
903 "Show message about safepoint synchronization") \
904 \
905 product(bool, SafepointTimeout, false, \
906 "Time out and warn or fail after SafepointTimeoutDelay " \
907 "milliseconds if failed to reach safepoint") \
908 \
909 develop(bool, DieOnSafepointTimeout, false, \
910 "Die upon failure to reach safepoint (see SafepointTimeout)") \
911 \
912 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
913 /* typically, at most a few retries are needed */ \
914 product(intx, SuspendRetryCount, 50, \
915 "Maximum retry count for an external suspend request") \
916 range(0, max_intx) \
917 \
918 product(intx, SuspendRetryDelay, 5, \
919 "Milliseconds to delay per retry (* current_retry_count)") \
920 range(0, max_intx) \
921 \
922 product(bool, AssertOnSuspendWaitFailure, false, \
923 "Assert/Guarantee on external suspend wait failure") \
924 \
925 product(bool, TraceSuspendWaitFailures, false, \
926 "Trace external suspend wait failures") \
927 \
928 product(bool, MaxFDLimit, true, \
929 "Bump the number of file descriptors to maximum in Solaris") \
930 \
931 diagnostic(bool, LogEvents, true, \
932 "Enable the various ring buffer event logs") \
933 \
934 diagnostic(uintx, LogEventsBufferEntries, 10, \
935 "Number of ring buffer event logs") \
936 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
937 \
938 product(bool, BytecodeVerificationRemote, true, \
939 "Enable the Java bytecode verifier for remote classes") \
940 \
941 product(bool, BytecodeVerificationLocal, false, \
942 "Enable the Java bytecode verifier for local classes") \
943 \
944 develop(bool, ForceFloatExceptions, trueInDebug, \
945 "Force exceptions on FP stack under/overflow") \
946 \
947 develop(bool, VerifyStackAtCalls, false, \
948 "Verify that the stack pointer is unchanged after calls") \
949 \
950 develop(bool, TraceJavaAssertions, false, \
951 "Trace java language assertions") \
952 \
953 notproduct(bool, CheckAssertionStatusDirectives, false, \
954 "Temporary - see javaClasses.cpp") \
955 \
956 notproduct(bool, PrintMallocFree, false, \
957 "Trace calls to C heap malloc/free allocation") \
958 \
959 product(bool, PrintOopAddress, false, \
960 "Always print the location of the oop") \
961 \
962 notproduct(bool, VerifyCodeCache, false, \
963 "Verify code cache on memory allocation/deallocation") \
964 \
965 develop(bool, UseMallocOnly, false, \
966 "Use only malloc/free for allocation (no resource area/arena)") \
967 \
968 develop(bool, PrintMalloc, false, \
969 "Print all malloc/free calls") \
970 \
971 develop(bool, PrintMallocStatistics, false, \
972 "Print malloc/free statistics") \
973 \
974 develop(bool, ZapResourceArea, trueInDebug, \
975 "Zap freed resource/arena space with 0xABABABAB") \
976 \
977 notproduct(bool, ZapVMHandleArea, trueInDebug, \
978 "Zap freed VM handle space with 0xBCBCBCBC") \
979 \
980 develop(bool, ZapJNIHandleArea, trueInDebug, \
981 "Zap freed JNI handle space with 0xFEFEFEFE") \
982 \
983 notproduct(bool, ZapStackSegments, trueInDebug, \
984 "Zap allocated/freed stack segments with 0xFADFADED") \
985 \
986 develop(bool, ZapUnusedHeapArea, trueInDebug, \
987 "Zap unused heap space with 0xBAADBABE") \
988 \
989 develop(bool, CheckZapUnusedHeapArea, false, \
990 "Check zapping of unused heap space") \
991 \
992 develop(bool, ZapFillerObjects, trueInDebug, \
993 "Zap filler objects with 0xDEAFBABE") \
994 \
995 develop(bool, PrintVMMessages, true, \
996 "Print VM messages on console") \
997 \
998 diagnostic(bool, VerboseVerification, false, \
999 "Display detailed verification details") \
1000 \
1001 notproduct(uintx, ErrorHandlerTest, 0, \
1002 "If > 0, provokes an error after VM initialization; the value " \
1003 "determines which error to provoke. See test_error_handler() " \
1004 "in debug.cpp.") \
1005 \
1006 notproduct(uintx, TestCrashInErrorHandler, 0, \
1007 "If > 0, provokes an error inside VM error handler (a secondary " \
1008 "crash). see test_error_handler() in debug.cpp.") \
1009 \
1010 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1011 "If true, tests SafeFetch inside error handler.") \
1012 \
1013 develop(bool, Verbose, false, \
1014 "Print additional debugging information from other modes") \
1015 \
1016 develop(bool, PrintMiscellaneous, false, \
1017 "Print uncategorized debugging information (requires +Verbose)") \
1018 \
1019 develop(bool, WizardMode, false, \
1020 "Print much more debugging information") \
1021 \
1022 product(bool, ShowMessageBoxOnError, false, \
1023 "Keep process alive on VM fatal error") \
1024 \
1025 product(bool, CreateCoredumpOnCrash, true, \
1026 "Create core/mini dump on VM fatal error") \
1027 \
1028 product(uint64_t, ErrorLogTimeout, 2 * 60, \
1029 "Timeout, in seconds, to limit the time spent on writing an " \
1030 "error log in case of a crash.") \
1031 range(0, (uint64_t)max_jlong/1000) \
1032 \
1033 product_pd(bool, UseOSErrorReporting, \
1034 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1035 \
1036 product(bool, SuppressFatalErrorMessage, false, \
1037 "Report NO fatal error message (avoid deadlock)") \
1038 \
1039 product(ccstrlist, OnError, "", \
1040 "Run user-defined commands on fatal error; see VMError.cpp " \
1041 "for examples") \
1042 \
1043 product(ccstrlist, OnOutOfMemoryError, "", \
1044 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1045 \
1046 manageable(bool, HeapDumpBeforeFullGC, false, \
1047 "Dump heap to file before any major stop-the-world GC") \
1048 \
1049 manageable(bool, HeapDumpAfterFullGC, false, \
1050 "Dump heap to file after any major stop-the-world GC") \
1051 \
1052 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1053 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1054 \
1055 manageable(ccstr, HeapDumpPath, NULL, \
1056 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1057 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1058 "in the working directory)") \
1059 \
1060 develop(size_t, HeapDumpSegmentSize, 1*G, \
1061 "Approximate segment size when generating a segmented heap dump") \
1062 \
1063 develop(bool, BreakAtWarning, false, \
1064 "Execute breakpoint upon encountering VM warning") \
1065 \
1066 develop(bool, UseFakeTimers, false, \
1067 "Tell whether the VM should use system time or a fake timer") \
1068 \
1069 product(ccstr, NativeMemoryTracking, "off", \
1070 "Native memory tracking options") \
1071 \
1072 diagnostic(bool, PrintNMTStatistics, false, \
1073 "Print native memory tracking summary data if it is on") \
1074 \
1075 diagnostic(bool, LogCompilation, false, \
1076 "Log compilation activity in detail to LogFile") \
1077 \
1078 product(bool, PrintCompilation, false, \
1079 "Print compilations") \
1080 \
1081 diagnostic(bool, TraceNMethodInstalls, false, \
1082 "Trace nmethod installation") \
1083 \
1084 diagnostic(intx, ScavengeRootsInCode, 2, \
1085 "0: do not allow scavengable oops in the code cache; " \
1086 "1: allow scavenging from the code cache; " \
1087 "2: emit as many constants as the compiler can see") \
1088 range(0, 2) \
1089 \
1090 product(bool, AlwaysRestoreFPU, false, \
1091 "Restore the FPU control word after every JNI call (expensive)") \
1092 \
1093 diagnostic(bool, PrintCompilation2, false, \
1094 "Print additional statistics per compilation") \
1095 \
1096 diagnostic(bool, PrintAdapterHandlers, false, \
1097 "Print code generated for i2c/c2i adapters") \
1098 \
1099 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1100 "Verify that i2c/c2i adapters are called properly") \
1101 \
1102 develop(bool, VerifyAdapterSharing, false, \
1103 "Verify that the code for shared adapters is the equivalent") \
1104 \
1105 diagnostic(bool, PrintAssembly, false, \
1106 "Print assembly code (using external disassembler.so)") \
1107 \
1108 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1109 "Print options string passed to disassembler.so") \
1110 \
1111 notproduct(bool, PrintNMethodStatistics, false, \
1112 "Print a summary statistic for the generated nmethods") \
1113 \
1114 diagnostic(bool, PrintNMethods, false, \
1115 "Print assembly code for nmethods when generated") \
1116 \
1117 diagnostic(bool, PrintNativeNMethods, false, \
1118 "Print assembly code for native nmethods when generated") \
1119 \
1120 develop(bool, PrintDebugInfo, false, \
1121 "Print debug information for all nmethods when generated") \
1122 \
1123 develop(bool, PrintRelocations, false, \
1124 "Print relocation information for all nmethods when generated") \
1125 \
1126 develop(bool, PrintDependencies, false, \
1127 "Print dependency information for all nmethods when generated") \
1128 \
1129 develop(bool, PrintExceptionHandlers, false, \
1130 "Print exception handler tables for all nmethods when generated") \
1131 \
1132 develop(bool, StressCompiledExceptionHandlers, false, \
1133 "Exercise compiled exception handlers") \
1134 \
1135 develop(bool, InterceptOSException, false, \
1136 "Start debugger when an implicit OS (e.g. NULL) " \
1137 "exception happens") \
1138 \
1139 product(bool, PrintCodeCache, false, \
1140 "Print the code cache memory usage when exiting") \
1141 \
1142 develop(bool, PrintCodeCache2, false, \
1143 "Print detailed usage information on the code cache when exiting")\
1144 \
1145 product(bool, PrintCodeCacheOnCompilation, false, \
1146 "Print the code cache memory usage each time a method is " \
1147 "compiled") \
1148 \
1149 diagnostic(bool, PrintStubCode, false, \
1150 "Print generated stub code") \
1151 \
1152 product(bool, StackTraceInThrowable, true, \
1153 "Collect backtrace in throwable when exception happens") \
1154 \
1155 product(bool, OmitStackTraceInFastThrow, true, \
1156 "Omit backtraces for some 'hot' exceptions in optimized code") \
1157 \
1158 product(bool, ProfilerPrintByteCodeStatistics, false, \
1159 "Print bytecode statistics when dumping profiler output") \
1160 \
1161 product(bool, ProfilerRecordPC, false, \
1162 "Collect ticks for each 16 byte interval of compiled code") \
1163 \
1164 product(bool, ProfileVM, false, \
1165 "Profile ticks that fall within VM (either in the VM Thread " \
1166 "or VM code called through stubs)") \
1167 \
1168 product(bool, ProfileIntervals, false, \
1169 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1170 \
1171 notproduct(bool, ProfilerCheckIntervals, false, \
1172 "Collect and print information on spacing of profiler ticks") \
1173 \
1174 product(bool, PrintWarnings, true, \
1175 "Print JVM warnings to output stream") \
1176 \
1177 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1178 "Print warnings for stalled SpinLocks") \
1179 \
1180 product(bool, RegisterFinalizersAtInit, true, \
1181 "Register finalizable objects at end of Object.<init> or " \
1182 "after allocation") \
1183 \
1184 develop(bool, RegisterReferences, true, \
1185 "Tell whether the VM should register soft/weak/final/phantom " \
1186 "references") \
1187 \
1188 develop(bool, IgnoreRewrites, false, \
1189 "Suppress rewrites of bytecodes in the oopmap generator. " \
1190 "This is unsafe!") \
1191 \
1192 develop(bool, PrintCodeCacheExtension, false, \
1193 "Print extension of code cache") \
1194 \
1195 develop(bool, UsePrivilegedStack, true, \
1196 "Enable the security JVM functions") \
1197 \
1198 develop(bool, ProtectionDomainVerification, true, \
1199 "Verify protection domain before resolution in system dictionary")\
1200 \
1201 product(bool, ClassUnloading, true, \
1202 "Do unloading of classes") \
1203 \
1204 product(bool, ClassUnloadingWithConcurrentMark, true, \
1205 "Do unloading of classes with a concurrent marking cycle") \
1206 \
1207 develop(bool, DisableStartThread, false, \
1208 "Disable starting of additional Java threads " \
1209 "(for debugging only)") \
1210 \
1211 develop(bool, MemProfiling, false, \
1212 "Write memory usage profiling to log file") \
1213 \
1214 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1215 "Print the system dictionary at exit") \
1216 \
1217 experimental(intx, PredictedLoadedClassCount, 0, \
1218 "Experimental: Tune loaded class cache starting size") \
1219 \
1220 diagnostic(bool, UnsyncloadClass, false, \
1221 "Unstable: VM calls loadClass unsynchronized. Custom " \
1222 "class loader must call VM synchronized for findClass " \
1223 "and defineClass.") \
1224 \
1225 product(bool, AlwaysLockClassLoader, false, \
1226 "Require the VM to acquire the class loader lock before calling " \
1227 "loadClass() even for class loaders registering " \
1228 "as parallel capable") \
1229 \
1230 product(bool, AllowParallelDefineClass, false, \
1231 "Allow parallel defineClass requests for class loaders " \
1232 "registering as parallel capable") \
1233 \
1234 product(bool, MustCallLoadClassInternal, false, \
1235 "Call loadClassInternal() rather than loadClass()") \
1236 \
1237 product_pd(bool, DontYieldALot, \
1238 "Throw away obvious excess yield calls") \
1239 \
1240 product(bool, ConvertSleepToYield, true, \
1241 "Convert sleep(0) to thread yield ") \
1242 \
1243 product(bool, ConvertYieldToSleep, false, \
1244 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1245 "behavior") \
1246 \
1247 develop(bool, UseDetachedThreads, true, \
1248 "Use detached threads that are recycled upon termination " \
1249 "(for Solaris only)") \
1250 \
1251 product(bool, UseLWPSynchronization, true, \
1252 "Use LWP-based instead of libthread-based synchronization " \
1253 "(SPARC only)") \
1254 \
1255 experimental(ccstr, SyncKnobs, NULL, \
1256 "(Unstable) Various monitor synchronization tunables") \
1257 \
1258 experimental(intx, EmitSync, 0, \
1259 "(Unsafe, Unstable) " \
1260 "Control emission of inline sync fast-path code") \
1261 \
1262 product(intx, MonitorBound, 0, "Bound Monitor population") \
1263 range(0, max_jint) \
1264 \
1265 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1266 \
1267 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1268 "Experimental Sync flags") \
1269 \
1270 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1271 \
1272 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1273 \
1274 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1275 \
1276 experimental(intx, hashCode, 5, \
1277 "(Unstable) select hashCode generation algorithm") \
1278 \
1279 product(bool, FilterSpuriousWakeups, true, \
1280 "When true prevents OS-level spurious, or premature, wakeups " \
1281 "from Object.wait (Ignored for Windows)") \
1282 \
1283 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1284 \
1285 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1286 \
1287 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1288 \
1289 develop(bool, UsePthreads, false, \
1290 "Use pthread-based instead of libthread-based synchronization " \
1291 "(SPARC only)") \
1292 \
1293 product(bool, ReduceSignalUsage, false, \
1294 "Reduce the use of OS signals in Java and/or the VM") \
1295 \
1296 develop_pd(bool, ShareVtableStubs, \
1297 "Share vtable stubs (smaller code but worse branch prediction") \
1298 \
1299 develop(bool, LoadLineNumberTables, true, \
1300 "Tell whether the class file parser loads line number tables") \
1301 \
1302 develop(bool, LoadLocalVariableTables, true, \
1303 "Tell whether the class file parser loads local variable tables") \
1304 \
1305 develop(bool, LoadLocalVariableTypeTables, true, \
1306 "Tell whether the class file parser loads local variable type" \
1307 "tables") \
1308 \
1309 product(bool, AllowUserSignalHandlers, false, \
1310 "Do not complain if the application installs signal handlers " \
1311 "(Solaris & Linux only)") \
1312 \
1313 product(bool, UseSignalChaining, true, \
1314 "Use signal-chaining to invoke signal handlers installed " \
1315 "by the application (Solaris & Linux only)") \
1316 \
1317 product(bool, AllowJNIEnvProxy, false, \
1318 "Allow JNIEnv proxies for jdbx") \
1319 \
1320 product(bool, RestoreMXCSROnJNICalls, false, \
1321 "Restore MXCSR when returning from JNI calls") \
1322 \
1323 product(bool, CheckJNICalls, false, \
1324 "Verify all arguments to JNI calls") \
1325 \
1326 product(bool, CheckEndorsedAndExtDirs, false, \
1327 "Verify the endorsed and extension directories are not used") \
1328 \
1329 product(bool, UseFastJNIAccessors, true, \
1330 "Use optimized versions of Get<Primitive>Field") \
1331 \
1332 product(intx, MaxJNILocalCapacity, 65536, \
1333 "Maximum allowable local JNI handle capacity to " \
1334 "EnsureLocalCapacity() and PushLocalFrame(), " \
1335 "where <= 0 is unlimited, default: 65536") \
1336 range(min_intx, max_intx) \
1337 \
1338 product(bool, EagerXrunInit, false, \
1339 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1340 "but not all -Xrun libraries may support the state of the VM " \
1341 "at this time") \
1342 \
1343 product(bool, PreserveAllAnnotations, false, \
1344 "Preserve RuntimeInvisibleAnnotations as well " \
1345 "as RuntimeVisibleAnnotations") \
1346 \
1347 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1348 "Number of OutOfMemoryErrors preallocated with backtrace") \
1349 \
1350 product(bool, UseXMMForArrayCopy, false, \
1351 "Use SSE2 MOVQ instruction for Arraycopy") \
1352 \
1353 product(intx, FieldsAllocationStyle, 1, \
1354 "0 - type based with oops first, " \
1355 "1 - with oops last, " \
1356 "2 - oops in super and sub classes are together") \
1357 range(0, 2) \
1358 \
1359 product(bool, CompactFields, true, \
1360 "Allocate nonstatic fields in gaps between previous fields") \
1361 \
1362 notproduct(bool, PrintFieldLayout, false, \
1363 "Print field layout for each class") \
1364 \
1365 notproduct(bool, PrintValueLayout, false, \
1366 "Print field layout for each value type") \
1367 \
1368 notproduct(bool, PrintValueArrayLayout, false, \
1369 "Print array layout for each value type array") \
1370 \
1371 product(bool, ValueArrayFlatten, true, \
1372 "Flatten value array elements, if possible") \
1373 \
1374 product(intx, ValueArrayElemMaxFlatSize, -1, \
1375 "Max size for flattening value array elements, <0 no limit") \
1376 \
1377 product(intx, ValueArrayElemMaxFlatOops, 4, \
1378 "Max nof embedded object references in a value type to flatten, <0 no limit") \
1379 \
1380 product(bool, ValueArrayAtomicAccess, false, \
1381 "Atomic value array accesses by-default, for all value arrays") \
1382 \
1383 /* Need to limit the extent of the padding to reasonable size. */\
1384 /* 8K is well beyond the reasonable HW cache line size, even with */\
1385 /* aggressive prefetching, while still leaving the room for segregating */\
1386 /* among the distinct pages. */\
1387 product(intx, ContendedPaddingWidth, 128, \
1388 "How many bytes to pad the fields/classes marked @Contended with")\
1389 range(0, 8192) \
1390 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1391 \
1392 product(bool, EnableContended, true, \
1393 "Enable @Contended annotation support") \
1394 \
1395 product(bool, RestrictContended, true, \
1396 "Restrict @Contended to trusted classes") \
1397 \
1398 product(bool, UseBiasedLocking, true, \
1399 "Enable biased locking in JVM") \
1400 \
1401 product(intx, BiasedLockingStartupDelay, 4000, \
1402 "Number of milliseconds to wait before enabling biased locking") \
1403 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1404 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1405 \
1406 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1407 "Print statistics of biased locking in JVM") \
1408 \
1409 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1410 "Threshold of number of revocations per type to try to " \
1411 "rebias all objects in the heap of that type") \
1412 range(0, max_intx) \
1413 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1414 \
1415 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1416 "Threshold of number of revocations per type to permanently " \
1417 "revoke biases of all objects in the heap of that type") \
1418 range(0, max_intx) \
1419 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1420 \
1421 product(intx, BiasedLockingDecayTime, 25000, \
1422 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1423 "type after previous bulk rebias") \
1424 range(500, max_intx) \
1425 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1426 \
1427 product(bool, ExitOnOutOfMemoryError, false, \
1428 "JVM exits on the first occurrence of an out-of-memory error") \
1429 \
1430 product(bool, CrashOnOutOfMemoryError, false, \
1431 "JVM aborts, producing an error log and core/mini dump, on the " \
1432 "first occurrence of an out-of-memory error") \
1433 \
1434 /* tracing */ \
1435 \
1436 develop(bool, StressRewriter, false, \
1437 "Stress linktime bytecode rewriting") \
1438 \
1439 product(ccstr, TraceJVMTI, NULL, \
1440 "Trace flags for JVMTI functions and events") \
1441 \
1442 /* This option can change an EMCP method into an obsolete method. */ \
1443 /* This can affect tests that except specific methods to be EMCP. */ \
1444 /* This option should be used with caution. */ \
1445 product(bool, StressLdcRewrite, false, \
1446 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1447 \
1448 product(uintx, TraceRedefineClasses, 0, \
1449 "Trace level for JVMTI RedefineClasses") \
1450 range(0, 0xFFFFFFFF) \
1451 \
1452 /* change to false by default sometime after Mustang */ \
1453 product(bool, VerifyMergedCPBytecodes, true, \
1454 "Verify bytecodes after RedefineClasses constant pool merging") \
1455 \
1456 develop(bool, TraceBytecodes, false, \
1457 "Trace bytecode execution") \
1458 \
1459 develop(bool, TraceICs, false, \
1460 "Trace inline cache changes") \
1461 \
1462 notproduct(bool, TraceInvocationCounterOverflow, false, \
1463 "Trace method invocation counter overflow") \
1464 \
1465 develop(bool, TraceInlineCacheClearing, false, \
1466 "Trace clearing of inline caches in nmethods") \
1467 \
1468 develop(bool, TraceDependencies, false, \
1469 "Trace dependencies") \
1470 \
1471 develop(bool, VerifyDependencies, trueInDebug, \
1472 "Exercise and verify the compilation dependency mechanism") \
1473 \
1474 develop(bool, TraceNewOopMapGeneration, false, \
1475 "Trace OopMapGeneration") \
1476 \
1477 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1478 "Trace OopMapGeneration: print detailed cell states") \
1479 \
1480 develop(bool, TimeOopMap, false, \
1481 "Time calls to GenerateOopMap::compute_map() in sum") \
1482 \
1483 develop(bool, TimeOopMap2, false, \
1484 "Time calls to GenerateOopMap::compute_map() individually") \
1485 \
1486 develop(bool, TraceMonitorMismatch, false, \
1487 "Trace monitor matching failures during OopMapGeneration") \
1488 \
1489 develop(bool, TraceOopMapRewrites, false, \
1490 "Trace rewriting of method oops during oop map generation") \
1491 \
1492 develop(bool, TraceICBuffer, false, \
1493 "Trace usage of IC buffer") \
1494 \
1495 develop(bool, TraceCompiledIC, false, \
1496 "Trace changes of compiled IC") \
1497 \
1498 develop(bool, TraceClearedExceptions, false, \
1499 "Print when an exception is forcibly cleared") \
1500 \
1501 /* gc */ \
1502 \
1503 product(bool, UseSerialGC, false, \
1504 "Use the Serial garbage collector") \
1505 \
1506 product(bool, UseG1GC, false, \
1507 "Use the Garbage-First garbage collector") \
1508 \
1509 product(bool, UseParallelGC, false, \
1510 "Use the Parallel Scavenge garbage collector") \
1511 \
1512 product(bool, UseParallelOldGC, false, \
1513 "Use the Parallel Old garbage collector") \
1514 \
1515 product(uintx, HeapMaximumCompactionInterval, 20, \
1516 "How often should we maximally compact the heap (not allowing " \
1517 "any dead space)") \
1518 range(0, max_uintx) \
1519 \
1520 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1521 "The collection count for the first maximum compaction") \
1522 range(0, max_uintx) \
1523 \
1524 product(bool, UseMaximumCompactionOnSystemGC, true, \
1525 "Use maximum compaction in the Parallel Old garbage collector " \
1526 "for a system GC") \
1527 \
1528 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1529 "The mean used by the parallel compact dead wood " \
1530 "limiter (a number between 0-100)") \
1531 range(0, 100) \
1532 \
1533 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1534 "The standard deviation used by the parallel compact dead wood " \
1535 "limiter (a number between 0-100)") \
1536 range(0, 100) \
1537 \
1538 product(uint, ParallelGCThreads, 0, \
1539 "Number of parallel threads parallel gc will use") \
1540 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1541 \
1542 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1543 "Use semaphore synchronization for the GC Threads, " \
1544 "instead of synchronization based on mutexes") \
1545 \
1546 product(bool, UseDynamicNumberOfGCThreads, false, \
1547 "Dynamically choose the number of parallel threads " \
1548 "parallel gc will use") \
1549 \
1550 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1551 "Force dynamic selection of the number of " \
1552 "parallel threads parallel gc will use to aid debugging") \
1553 \
1554 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1555 "Size of heap (bytes) per GC thread used in calculating the " \
1556 "number of GC threads") \
1557 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1558 \
1559 product(uint, ConcGCThreads, 0, \
1560 "Number of threads concurrent gc will use") \
1561 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1562 \
1563 product(uintx, GCTaskTimeStampEntries, 200, \
1564 "Number of time stamp entries per gc worker thread") \
1565 range(1, max_uintx) \
1566 \
1567 product(bool, AlwaysTenure, false, \
1568 "Always tenure objects in eden (ParallelGC only)") \
1569 \
1570 product(bool, NeverTenure, false, \
1571 "Never tenure objects in eden, may tenure on overflow " \
1572 "(ParallelGC only)") \
1573 \
1574 product(bool, ScavengeBeforeFullGC, true, \
1575 "Scavenge youngest generation before each full GC.") \
1576 \
1577 product(bool, UseConcMarkSweepGC, false, \
1578 "Use Concurrent Mark-Sweep GC in the old generation") \
1579 \
1580 product(bool, ExplicitGCInvokesConcurrent, false, \
1581 "A System.gc() request invokes a concurrent collection; " \
1582 "(effective only when using concurrent collectors)") \
1583 \
1584 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1585 "A System.gc() request invokes a concurrent collection and " \
1586 "also unloads classes during such a concurrent gc cycle " \
1587 "(effective only when UseConcMarkSweepGC)") \
1588 \
1589 product(bool, GCLockerInvokesConcurrent, false, \
1590 "The exit of a JNI critical section necessitating a scavenge, " \
1591 "also kicks off a background concurrent collection") \
1592 \
1593 product(uintx, GCLockerEdenExpansionPercent, 5, \
1594 "How much the GC can expand the eden by while the GC locker " \
1595 "is active (as a percentage)") \
1596 range(0, 100) \
1597 \
1598 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1599 "Number of times to retry allocations when " \
1600 "blocked by the GC locker") \
1601 range(0, max_uintx) \
1602 \
1603 product(bool, UseCMSBestFit, true, \
1604 "Use CMS best fit allocation strategy") \
1605 \
1606 product(bool, UseParNewGC, false, \
1607 "Use parallel threads in the new generation") \
1608 \
1609 product(uintx, ParallelGCBufferWastePct, 10, \
1610 "Wasted fraction of parallel allocation buffer") \
1611 range(0, 100) \
1612 \
1613 product(uintx, TargetPLABWastePct, 10, \
1614 "Target wasted space in last buffer as percent of overall " \
1615 "allocation") \
1616 range(1, 100) \
1617 \
1618 product(uintx, PLABWeight, 75, \
1619 "Percentage (0-100) used to weight the current sample when " \
1620 "computing exponentially decaying average for ResizePLAB") \
1621 range(0, 100) \
1622 \
1623 product(bool, ResizePLAB, true, \
1624 "Dynamically resize (survivor space) promotion LAB's") \
1625 \
1626 product(intx, ParGCArrayScanChunk, 50, \
1627 "Scan a subset of object array and push remainder, if array is " \
1628 "bigger than this") \
1629 range(1, max_intx) \
1630 \
1631 product(bool, ParGCUseLocalOverflow, false, \
1632 "Instead of a global overflow list, use local overflow stacks") \
1633 \
1634 product(bool, ParGCTrimOverflow, true, \
1635 "Eagerly trim the local overflow lists " \
1636 "(when ParGCUseLocalOverflow)") \
1637 \
1638 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1639 "Simulate work queue overflow in ParNew") \
1640 \
1641 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1642 "An `interval' counter that determines how frequently " \
1643 "we simulate overflow; a smaller number increases frequency") \
1644 \
1645 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1646 "The desired number of objects to claim from the overflow list") \
1647 range(0, max_uintx) \
1648 \
1649 diagnostic(uintx, ParGCStridesPerThread, 2, \
1650 "The number of strides per worker thread that we divide up the " \
1651 "card table scanning work into") \
1652 range(1, max_uintx) \
1653 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1654 \
1655 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1656 "The number of cards in each chunk of the parallel chunks used " \
1657 "during card table scanning") \
1658 range(1, max_intx) \
1659 \
1660 product(uintx, OldPLABWeight, 50, \
1661 "Percentage (0-100) used to weight the current sample when " \
1662 "computing exponentially decaying average for resizing " \
1663 "OldPLABSize") \
1664 range(0, 100) \
1665 \
1666 product(bool, ResizeOldPLAB, true, \
1667 "Dynamically resize (old gen) promotion LAB's") \
1668 \
1669 product(size_t, CMSOldPLABMax, 1024, \
1670 "Maximum size of CMS gen promotion LAB caches per worker " \
1671 "per block size") \
1672 range(1, max_uintx) \
1673 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1674 \
1675 product(size_t, CMSOldPLABMin, 16, \
1676 "Minimum size of CMS gen promotion LAB caches per worker " \
1677 "per block size") \
1678 range(1, max_uintx) \
1679 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1680 \
1681 product(uintx, CMSOldPLABNumRefills, 4, \
1682 "Nominal number of refills of CMS gen promotion LAB cache " \
1683 "per worker per block size") \
1684 range(1, max_uintx) \
1685 \
1686 product(bool, CMSOldPLABResizeQuicker, false, \
1687 "React on-the-fly during a scavenge to a sudden " \
1688 "change in block demand rate") \
1689 \
1690 product(uintx, CMSOldPLABToleranceFactor, 4, \
1691 "The tolerance of the phase-change detector for on-the-fly " \
1692 "PLAB resizing during a scavenge") \
1693 range(1, max_uintx) \
1694 \
1695 product(uintx, CMSOldPLABReactivityFactor, 2, \
1696 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1697 "during a scavenge") \
1698 range(1, max_uintx) \
1699 \
1700 product(bool, AlwaysPreTouch, false, \
1701 "Force all freshly committed pages to be pre-touched") \
1702 \
1703 product_pd(size_t, CMSYoungGenPerWorker, \
1704 "The maximum size of young gen chosen by default per GC worker " \
1705 "thread available") \
1706 range(1, max_uintx) \
1707 \
1708 product(uintx, CMSIncrementalSafetyFactor, 10, \
1709 "Percentage (0-100) used to add conservatism when computing the " \
1710 "duty cycle") \
1711 range(0, 100) \
1712 \
1713 product(uintx, CMSExpAvgFactor, 50, \
1714 "Percentage (0-100) used to weight the current sample when " \
1715 "computing exponential averages for CMS statistics") \
1716 range(0, 100) \
1717 \
1718 product(uintx, CMS_FLSWeight, 75, \
1719 "Percentage (0-100) used to weight the current sample when " \
1720 "computing exponentially decaying averages for CMS FLS " \
1721 "statistics") \
1722 range(0, 100) \
1723 \
1724 product(uintx, CMS_FLSPadding, 1, \
1725 "The multiple of deviation from mean to use for buffering " \
1726 "against volatility in free list demand") \
1727 range(0, max_juint) \
1728 \
1729 product(uintx, FLSCoalescePolicy, 2, \
1730 "CMS: aggressiveness level for coalescing, increasing " \
1731 "from 0 to 4") \
1732 range(0, 4) \
1733 \
1734 product(bool, FLSAlwaysCoalesceLarge, false, \
1735 "CMS: larger free blocks are always available for coalescing") \
1736 \
1737 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1738 "CMS: the smaller the percentage the greater the coalescing " \
1739 "force") \
1740 range(0.0, 1.0) \
1741 \
1742 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1743 "CMS: the factor by which to inflate estimated demand of small " \
1744 "block sizes to prevent coalescing with an adjoining block") \
1745 range(0.0, DBL_MAX) \
1746 \
1747 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1748 "CMS: the factor by which to inflate estimated demand of large " \
1749 "block sizes to prevent coalescing with an adjoining block") \
1750 range(0.0, DBL_MAX) \
1751 \
1752 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1753 "CMS: the factor by which to inflate estimated demand of small " \
1754 "block sizes to prevent splitting to supply demand for smaller " \
1755 "blocks") \
1756 range(0.0, DBL_MAX) \
1757 \
1758 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1759 "CMS: the factor by which to inflate estimated demand of large " \
1760 "block sizes to prevent splitting to supply demand for smaller " \
1761 "blocks") \
1762 range(0.0, DBL_MAX) \
1763 \
1764 product(bool, CMSExtrapolateSweep, false, \
1765 "CMS: cushion for block demand during sweep") \
1766 \
1767 product(uintx, CMS_SweepWeight, 75, \
1768 "Percentage (0-100) used to weight the current sample when " \
1769 "computing exponentially decaying average for inter-sweep " \
1770 "duration") \
1771 range(0, 100) \
1772 \
1773 product(uintx, CMS_SweepPadding, 1, \
1774 "The multiple of deviation from mean to use for buffering " \
1775 "against volatility in inter-sweep duration") \
1776 range(0, max_juint) \
1777 \
1778 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1779 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1780 "duration exceeds this threshold in milliseconds") \
1781 range(0, max_uintx) \
1782 \
1783 product(bool, CMSClassUnloadingEnabled, true, \
1784 "Whether class unloading enabled when using CMS GC") \
1785 \
1786 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1787 "When CMS class unloading is enabled, the maximum CMS cycle " \
1788 "count for which classes may not be unloaded") \
1789 range(0, max_uintx) \
1790 \
1791 product(uintx, CMSIndexedFreeListReplenish, 4, \
1792 "Replenish an indexed free list with this number of chunks") \
1793 range(1, max_uintx) \
1794 \
1795 product(bool, CMSReplenishIntermediate, true, \
1796 "Replenish all intermediate free-list caches") \
1797 \
1798 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1799 "When satisfying batched demand, split blocks from the " \
1800 "IndexedFreeList whose size is a multiple of requested size") \
1801 \
1802 product(bool, CMSLoopWarn, false, \
1803 "Warn in case of excessive CMS looping") \
1804 \
1805 /* where does the range max value of (max_jint - 1) come from? */ \
1806 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1807 "Maximum size of marking stack") \
1808 range(1, (max_jint - 1)) \
1809 \
1810 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1811 "Size of marking stack") \
1812 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1813 \
1814 notproduct(bool, CMSMarkStackOverflowALot, false, \
1815 "Simulate frequent marking stack / work queue overflow") \
1816 \
1817 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1818 "An \"interval\" counter that determines how frequently " \
1819 "to simulate overflow; a smaller number increases frequency") \
1820 \
1821 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1822 "Maximum number of abortable preclean iterations, if > 0") \
1823 range(0, max_uintx) \
1824 \
1825 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1826 "Maximum time in abortable preclean (in milliseconds)") \
1827 range(0, max_intx) \
1828 \
1829 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1830 "Nominal minimum work per abortable preclean iteration") \
1831 range(0, max_uintx) \
1832 \
1833 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1834 "Time that we sleep between iterations when not given " \
1835 "enough work per iteration") \
1836 range(0, max_intx) \
1837 \
1838 product(size_t, CMSRescanMultiple, 32, \
1839 "Size (in cards) of CMS parallel rescan task") \
1840 range(1, max_uintx) \
1841 \
1842 product(size_t, CMSConcMarkMultiple, 32, \
1843 "Size (in cards) of CMS concurrent MT marking task") \
1844 range(1, max_uintx) \
1845 \
1846 product(bool, CMSAbortSemantics, false, \
1847 "Whether abort-on-overflow semantics is implemented") \
1848 \
1849 product(bool, CMSParallelInitialMarkEnabled, true, \
1850 "Use the parallel initial mark.") \
1851 \
1852 product(bool, CMSParallelRemarkEnabled, true, \
1853 "Whether parallel remark enabled (only if ParNewGC)") \
1854 \
1855 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1856 "Whether parallel remark of survivor space " \
1857 "enabled (effective only if CMSParallelRemarkEnabled)") \
1858 \
1859 product(bool, CMSPLABRecordAlways, true, \
1860 "Always record survivor space PLAB boundaries (effective only " \
1861 "if CMSParallelSurvivorRemarkEnabled)") \
1862 \
1863 product(bool, CMSEdenChunksRecordAlways, true, \
1864 "Always record eden chunks used for the parallel initial mark " \
1865 "or remark of eden") \
1866 \
1867 product(bool, CMSConcurrentMTEnabled, true, \
1868 "Whether multi-threaded concurrent work enabled " \
1869 "(effective only if ParNewGC)") \
1870 \
1871 product(bool, CMSPrecleaningEnabled, true, \
1872 "Whether concurrent precleaning enabled") \
1873 \
1874 product(uintx, CMSPrecleanIter, 3, \
1875 "Maximum number of precleaning iteration passes") \
1876 range(0, 9) \
1877 \
1878 product(uintx, CMSPrecleanDenominator, 3, \
1879 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1880 "ratio") \
1881 range(1, max_uintx) \
1882 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1883 \
1884 product(uintx, CMSPrecleanNumerator, 2, \
1885 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1886 "ratio") \
1887 range(0, max_uintx-1) \
1888 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1889 \
1890 product(bool, CMSPrecleanRefLists1, true, \
1891 "Preclean ref lists during (initial) preclean phase") \
1892 \
1893 product(bool, CMSPrecleanRefLists2, false, \
1894 "Preclean ref lists during abortable preclean phase") \
1895 \
1896 product(bool, CMSPrecleanSurvivors1, false, \
1897 "Preclean survivors during (initial) preclean phase") \
1898 \
1899 product(bool, CMSPrecleanSurvivors2, true, \
1900 "Preclean survivors during abortable preclean phase") \
1901 \
1902 product(uintx, CMSPrecleanThreshold, 1000, \
1903 "Do not iterate again if number of dirty cards is less than this")\
1904 range(100, max_uintx) \
1905 \
1906 product(bool, CMSCleanOnEnter, true, \
1907 "Clean-on-enter optimization for reducing number of dirty cards") \
1908 \
1909 product(uintx, CMSRemarkVerifyVariant, 1, \
1910 "Choose variant (1,2) of verification following remark") \
1911 range(1, 2) \
1912 \
1913 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1914 "If Eden size is below this, do not try to schedule remark") \
1915 range(0, max_uintx) \
1916 \
1917 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1918 "The Eden occupancy percentage (0-100) at which " \
1919 "to try and schedule remark pause") \
1920 range(0, 100) \
1921 \
1922 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1923 "Start sampling eden top at least before young gen " \
1924 "occupancy reaches 1/<ratio> of the size at which " \
1925 "we plan to schedule remark") \
1926 range(1, max_uintx) \
1927 \
1928 product(uintx, CMSSamplingGrain, 16*K, \
1929 "The minimum distance between eden samples for CMS (see above)") \
1930 range(1, max_uintx) \
1931 \
1932 product(bool, CMSScavengeBeforeRemark, false, \
1933 "Attempt scavenge before the CMS remark step") \
1934 \
1935 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1936 "Don't drain below this size per parallel worker/thief") \
1937 range(1, max_juint) \
1938 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1939 \
1940 manageable(intx, CMSWaitDuration, 2000, \
1941 "Time in milliseconds that CMS thread waits for young GC") \
1942 range(min_jint, max_jint) \
1943 \
1944 develop(uintx, CMSCheckInterval, 1000, \
1945 "Interval in milliseconds that CMS thread checks if it " \
1946 "should start a collection cycle") \
1947 \
1948 product(bool, CMSYield, true, \
1949 "Yield between steps of CMS") \
1950 \
1951 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1952 "Bitmap operations should process at most this many bits " \
1953 "between yields") \
1954 range(1, max_uintx) \
1955 \
1956 product(bool, CMSPrintChunksInDump, false, \
1957 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1958 "trace level include more detailed information about the" \
1959 "free chunks") \
1960 \
1961 product(bool, CMSPrintObjectsInDump, false, \
1962 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1963 "trace level include more detailed information about the" \
1964 "allocated objects") \
1965 \
1966 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1967 "Verify that all references across the FLS boundary " \
1968 "are to valid objects") \
1969 \
1970 diagnostic(bool, FLSVerifyLists, false, \
1971 "Do lots of (expensive) FreeListSpace verification") \
1972 \
1973 diagnostic(bool, FLSVerifyIndexTable, false, \
1974 "Do lots of (expensive) FLS index table verification") \
1975 \
1976 develop(bool, FLSVerifyDictionary, false, \
1977 "Do lots of (expensive) FLS dictionary verification") \
1978 \
1979 develop(bool, VerifyBlockOffsetArray, false, \
1980 "Do (expensive) block offset array verification") \
1981 \
1982 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1983 "Maintain _unallocated_block in BlockOffsetArray " \
1984 "(currently applicable only to CMS collector)") \
1985 \
1986 product(intx, RefDiscoveryPolicy, 0, \
1987 "Select type of reference discovery policy: " \
1988 "reference-based(0) or referent-based(1)") \
1989 range(ReferenceProcessor::DiscoveryPolicyMin, \
1990 ReferenceProcessor::DiscoveryPolicyMax) \
1991 \
1992 product(bool, ParallelRefProcEnabled, false, \
1993 "Enable parallel reference processing whenever possible") \
1994 \
1995 product(bool, ParallelRefProcBalancingEnabled, true, \
1996 "Enable balancing of reference processing queues") \
1997 \
1998 product(uintx, CMSTriggerRatio, 80, \
1999 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2000 "allocated before a CMS collection cycle commences") \
2001 range(0, 100) \
2002 \
2003 product(uintx, CMSBootstrapOccupancy, 50, \
2004 "Percentage CMS generation occupancy at which to " \
2005 "initiate CMS collection for bootstrapping collection stats") \
2006 range(0, 100) \
2007 \
2008 product(intx, CMSInitiatingOccupancyFraction, -1, \
2009 "Percentage CMS generation occupancy to start a CMS collection " \
2010 "cycle. A negative value means that CMSTriggerRatio is used") \
2011 range(min_intx, 100) \
2012 \
2013 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2014 "The percent occupancy (IHOP) of the current old generation " \
2015 "capacity above which a concurrent mark cycle will be initiated " \
2016 "Its value may change over time if adaptive IHOP is enabled, " \
2017 "otherwise the value remains constant. " \
2018 "In the latter case a value of 0 will result as frequent as " \
2019 "possible concurrent marking cycles. A value of 100 disables " \
2020 "concurrent marking. " \
2021 "Fragmentation waste in the old generation is not considered " \
2022 "free space in this calculation. (G1 collector only)") \
2023 range(0, 100) \
2024 \
2025 manageable(intx, CMSTriggerInterval, -1, \
2026 "Commence a CMS collection cycle (at least) every so many " \
2027 "milliseconds (0 permanently, -1 disabled)") \
2028 range(-1, max_intx) \
2029 \
2030 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2031 "Only use occupancy as a criterion for starting a CMS collection")\
2032 \
2033 product(uintx, CMSIsTooFullPercentage, 98, \
2034 "An absolute ceiling above which CMS will always consider the " \
2035 "unloading of classes when class unloading is enabled") \
2036 range(0, 100) \
2037 \
2038 develop(bool, CMSTestInFreeList, false, \
2039 "Check if the coalesced range is already in the " \
2040 "free lists as claimed") \
2041 \
2042 notproduct(bool, CMSVerifyReturnedBytes, false, \
2043 "Check that all the garbage collected was returned to the " \
2044 "free lists") \
2045 \
2046 notproduct(bool, ScavengeALot, false, \
2047 "Force scavenge at every Nth exit from the runtime system " \
2048 "(N=ScavengeALotInterval)") \
2049 \
2050 develop(bool, FullGCALot, false, \
2051 "Force full gc at every Nth exit from the runtime system " \
2052 "(N=FullGCALotInterval)") \
2053 \
2054 notproduct(bool, GCALotAtAllSafepoints, false, \
2055 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2056 \
2057 notproduct(bool, PromotionFailureALot, false, \
2058 "Use promotion failure handling on every youngest generation " \
2059 "collection") \
2060 \
2061 develop(uintx, PromotionFailureALotCount, 1000, \
2062 "Number of promotion failures occurring at PLAB " \
2063 "refill attempts (ParNew) or promotion attempts " \
2064 "(other young collectors)") \
2065 \
2066 develop(uintx, PromotionFailureALotInterval, 5, \
2067 "Total collections between promotion failures a lot") \
2068 \
2069 experimental(uintx, WorkStealingSleepMillis, 1, \
2070 "Sleep time when sleep is used for yields") \
2071 \
2072 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2073 "Number of yields before a sleep is done during work stealing") \
2074 \
2075 experimental(uintx, WorkStealingHardSpins, 4096, \
2076 "Number of iterations in a spin loop between checks on " \
2077 "time out of hard spin") \
2078 \
2079 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2080 "Ratio of hard spins to calls to yield") \
2081 \
2082 develop(uintx, ObjArrayMarkingStride, 512, \
2083 "Number of object array elements to push onto the marking stack " \
2084 "before pushing a continuation entry") \
2085 \
2086 develop(bool, MetadataAllocationFailALot, false, \
2087 "Fail metadata allocations at intervals controlled by " \
2088 "MetadataAllocationFailALotInterval") \
2089 \
2090 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2091 "Metadata allocation failure a lot interval") \
2092 \
2093 develop(bool, TraceMetadataChunkAllocation, false, \
2094 "Trace chunk metadata allocations") \
2095 \
2096 notproduct(bool, ExecuteInternalVMTests, false, \
2097 "Enable execution of internal VM tests") \
2098 \
2099 notproduct(bool, VerboseInternalVMTests, false, \
2100 "Turn on logging for internal VM tests.") \
2101 \
2102 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2103 \
2104 product_pd(bool, ResizeTLAB, \
2105 "Dynamically resize TLAB size for threads") \
2106 \
2107 product(bool, ZeroTLAB, false, \
2108 "Zero out the newly created TLAB") \
2109 \
2110 product(bool, FastTLABRefill, true, \
2111 "Use fast TLAB refill code") \
2112 \
2113 product(bool, TLABStats, true, \
2114 "Provide more detailed and expensive TLAB statistics.") \
2115 \
2116 product_pd(bool, NeverActAsServerClassMachine, \
2117 "Never act like a server-class machine") \
2118 \
2119 product(bool, AlwaysActAsServerClassMachine, false, \
2120 "Always act like a server-class machine") \
2121 \
2122 product_pd(uint64_t, MaxRAM, \
2123 "Real memory size (in bytes) used to set maximum heap size") \
2124 range(0, 0XFFFFFFFFFFFFFFFF) \
2125 \
2126 product(size_t, ErgoHeapSizeLimit, 0, \
2127 "Maximum ergonomically set heap size (in bytes); zero means use " \
2128 "MaxRAM / MaxRAMFraction") \
2129 range(0, max_uintx) \
2130 \
2131 product(uintx, MaxRAMFraction, 4, \
2132 "Maximum fraction (1/n) of real memory used for maximum heap " \
2133 "size") \
2134 range(1, max_uintx) \
2135 \
2136 product(uintx, MinRAMFraction, 2, \
2137 "Minimum fraction (1/n) of real memory used for maximum heap " \
2138 "size on systems with small physical memory size") \
2139 range(1, max_uintx) \
2140 \
2141 product(uintx, InitialRAMFraction, 64, \
2142 "Fraction (1/n) of real memory used for initial heap size") \
2143 range(1, max_uintx) \
2144 \
2145 develop(uintx, MaxVirtMemFraction, 2, \
2146 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2147 "determining maximum heap size") \
2148 \
2149 product(bool, UseAutoGCSelectPolicy, false, \
2150 "Use automatic collection selection policy") \
2151 \
2152 product(uintx, AutoGCSelectPauseMillis, 5000, \
2153 "Automatic GC selection pause threshold in milliseconds") \
2154 range(0, max_uintx) \
2155 \
2156 product(bool, UseAdaptiveSizePolicy, true, \
2157 "Use adaptive generation sizing policies") \
2158 \
2159 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2160 "Use adaptive survivor sizing policies") \
2161 \
2162 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2163 "Use adaptive young-old sizing policies at minor collections") \
2164 \
2165 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2166 "Use adaptive young-old sizing policies at major collections") \
2167 \
2168 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2169 "Include statistics from System.gc() for adaptive size policy") \
2170 \
2171 product(bool, UseAdaptiveGCBoundary, false, \
2172 "Allow young-old boundary to move") \
2173 \
2174 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2175 "Resize the virtual spaces of the young or old generations") \
2176 range(-1, 1) \
2177 \
2178 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2179 "Policy for changing generation size for throughput goals") \
2180 range(0, 1) \
2181 \
2182 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2183 "Number of steps where heuristics is used before data is used") \
2184 range(0, max_uintx) \
2185 \
2186 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2187 "Number of collections before the adaptive sizing is started") \
2188 \
2189 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2190 "Collection interval for printing information; zero means never") \
2191 range(0, max_uintx) \
2192 \
2193 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2194 "Use adaptive minimum footprint as a goal") \
2195 \
2196 product(uintx, AdaptiveSizePolicyWeight, 10, \
2197 "Weight given to exponential resizing, between 0 and 100") \
2198 range(0, 100) \
2199 \
2200 product(uintx, AdaptiveTimeWeight, 25, \
2201 "Weight given to time in adaptive policy, between 0 and 100") \
2202 range(0, 100) \
2203 \
2204 product(uintx, PausePadding, 1, \
2205 "How much buffer to keep for pause time") \
2206 range(0, max_juint) \
2207 \
2208 product(uintx, PromotedPadding, 3, \
2209 "How much buffer to keep for promotion failure") \
2210 range(0, max_juint) \
2211 \
2212 product(uintx, SurvivorPadding, 3, \
2213 "How much buffer to keep for survivor overflow") \
2214 range(0, max_juint) \
2215 \
2216 product(uintx, ThresholdTolerance, 10, \
2217 "Allowed collection cost difference between generations") \
2218 range(0, 100) \
2219 \
2220 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2221 "If collection costs are within margin, reduce both by full " \
2222 "delta") \
2223 range(0, 100) \
2224 \
2225 product(uintx, YoungGenerationSizeIncrement, 20, \
2226 "Adaptive size percentage change in young generation") \
2227 range(0, 100) \
2228 \
2229 product(uintx, YoungGenerationSizeSupplement, 80, \
2230 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2231 range(0, 100) \
2232 \
2233 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2234 "Decay factor to YoungedGenerationSizeSupplement") \
2235 range(1, max_uintx) \
2236 \
2237 product(uintx, TenuredGenerationSizeIncrement, 20, \
2238 "Adaptive size percentage change in tenured generation") \
2239 range(0, 100) \
2240 \
2241 product(uintx, TenuredGenerationSizeSupplement, 80, \
2242 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2243 range(0, 100) \
2244 \
2245 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2246 "Decay factor to TenuredGenerationSizeIncrement") \
2247 range(1, max_uintx) \
2248 \
2249 product(uintx, MaxGCPauseMillis, max_uintx, \
2250 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2251 "or (G1 Only) the maximum GC time per MMU time slice") \
2252 range(1, max_uintx) \
2253 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \
2254 \
2255 product(uintx, GCPauseIntervalMillis, 0, \
2256 "Time slice for MMU specification") \
2257 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \
2258 \
2259 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2260 "Adaptive size policy maximum GC minor pause time goal " \
2261 "in millisecond") \
2262 range(0, max_uintx) \
2263 \
2264 product(uintx, GCTimeRatio, 99, \
2265 "Adaptive size policy application time to GC time ratio") \
2266 range(0, max_juint) \
2267 \
2268 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2269 "Adaptive size scale down factor for shrinking") \
2270 range(1, max_uintx) \
2271 \
2272 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2273 "Adaptive size decays the major cost for long major intervals") \
2274 \
2275 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2276 "Time scale over which major costs decay") \
2277 range(0, max_uintx) \
2278 \
2279 product(uintx, MinSurvivorRatio, 3, \
2280 "Minimum ratio of young generation/survivor space size") \
2281 range(3, max_uintx) \
2282 \
2283 product(uintx, InitialSurvivorRatio, 8, \
2284 "Initial ratio of young generation/survivor space size") \
2285 range(0, max_uintx) \
2286 \
2287 product(size_t, BaseFootPrintEstimate, 256*M, \
2288 "Estimate of footprint other than Java Heap") \
2289 range(0, max_uintx) \
2290 \
2291 product(bool, UseGCOverheadLimit, true, \
2292 "Use policy to limit of proportion of time spent in GC " \
2293 "before an OutOfMemory error is thrown") \
2294 \
2295 product(uintx, GCTimeLimit, 98, \
2296 "Limit of the proportion of time spent in GC before " \
2297 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2298 range(0, 100) \
2299 \
2300 product(uintx, GCHeapFreeLimit, 2, \
2301 "Minimum percentage of free space after a full GC before an " \
2302 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2303 range(0, 100) \
2304 \
2305 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2306 "Number of consecutive collections before gc time limit fires") \
2307 range(1, max_uintx) \
2308 \
2309 product(intx, PrefetchCopyIntervalInBytes, -1, \
2310 "How far ahead to prefetch destination area (<= 0 means off)") \
2311 range(-1, max_jint) \
2312 \
2313 product(intx, PrefetchScanIntervalInBytes, -1, \
2314 "How far ahead to prefetch scan area (<= 0 means off)") \
2315 range(-1, max_jint) \
2316 \
2317 product(intx, PrefetchFieldsAhead, -1, \
2318 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2319 range(-1, max_jint) \
2320 \
2321 diagnostic(bool, VerifyDuringStartup, false, \
2322 "Verify memory system before executing any Java code " \
2323 "during VM initialization") \
2324 \
2325 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2326 "Verify system before exiting") \
2327 \
2328 diagnostic(bool, VerifyBeforeGC, false, \
2329 "Verify memory system before GC") \
2330 \
2331 diagnostic(bool, VerifyAfterGC, false, \
2332 "Verify memory system after GC") \
2333 \
2334 diagnostic(bool, VerifyDuringGC, false, \
2335 "Verify memory system during GC (between phases)") \
2336 \
2337 diagnostic(ccstrlist, VerifySubSet, "", \
2338 "Memory sub-systems to verify when Verify*GC flag(s) " \
2339 "are enabled. One or more sub-systems can be specified " \
2340 "in a comma separated string. Sub-systems are: " \
2341 "threads, heap, symbol_table, string_table, codecache, " \
2342 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2343 "c-heap, codecache_oops") \
2344 \
2345 diagnostic(bool, GCParallelVerificationEnabled, true, \
2346 "Enable parallel memory system verification") \
2347 \
2348 diagnostic(bool, DeferInitialCardMark, false, \
2349 "When +ReduceInitialCardMarks, explicitly defer any that " \
2350 "may arise from new_pre_store_barrier") \
2351 \
2352 product(bool, UseCondCardMark, false, \
2353 "Check for already marked card before updating card table") \
2354 \
2355 diagnostic(bool, VerifyRememberedSets, false, \
2356 "Verify GC remembered sets") \
2357 \
2358 diagnostic(bool, VerifyObjectStartArray, true, \
2359 "Verify GC object start array if verify before/after") \
2360 \
2361 product(bool, DisableExplicitGC, false, \
2362 "Ignore calls to System.gc()") \
2363 \
2364 notproduct(bool, CheckMemoryInitialization, false, \
2365 "Check memory initialization") \
2366 \
2367 diagnostic(bool, BindCMSThreadToCPU, false, \
2368 "Bind CMS Thread to CPU if possible") \
2369 \
2370 diagnostic(uintx, CPUForCMSThread, 0, \
2371 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2372 range(0, max_juint) \
2373 \
2374 product(bool, BindGCTaskThreadsToCPUs, false, \
2375 "Bind GCTaskThreads to CPUs if possible") \
2376 \
2377 product(bool, UseGCTaskAffinity, false, \
2378 "Use worker affinity when asking for GCTasks") \
2379 \
2380 product(uintx, ProcessDistributionStride, 4, \
2381 "Stride through processors when distributing processes") \
2382 range(0, max_juint) \
2383 \
2384 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2385 "Number of times the coordinator GC thread will sleep while " \
2386 "yielding before giving up and resuming GC") \
2387 range(0, max_juint) \
2388 \
2389 product(uintx, CMSYieldSleepCount, 0, \
2390 "Number of times a GC thread (minus the coordinator) " \
2391 "will sleep while yielding before giving up and resuming GC") \
2392 range(0, max_juint) \
2393 \
2394 product(bool, PrintGC, false, \
2395 "Print message at garbage collection. " \
2396 "Deprecated, use -Xlog:gc instead.") \
2397 \
2398 product(bool, PrintGCDetails, false, \
2399 "Print more details at garbage collection. " \
2400 "Deprecated, use -Xlog:gc* instead.") \
2401 \
2402 develop(intx, ConcGCYieldTimeout, 0, \
2403 "If non-zero, assert that GC threads yield within this " \
2404 "number of milliseconds") \
2405 range(0, max_intx) \
2406 \
2407 develop(bool, TraceFinalizerRegistration, false, \
2408 "Trace registration of final references") \
2409 \
2410 notproduct(bool, TraceScavenge, false, \
2411 "Trace scavenge") \
2412 \
2413 product(bool, IgnoreEmptyClassPaths, false, \
2414 "Ignore empty path elements in -classpath") \
2415 \
2416 product(bool, TraceClassLoadingPreorder, false, \
2417 "Trace all classes loaded in order referenced (not loaded)") \
2418 \
2419 product_rw(bool, TraceLoaderConstraints, false, \
2420 "Trace loader constraints") \
2421 \
2422 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2423 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2424 "Initial size of the boot class loader data metaspace") \
2425 range(30*K, max_uintx/BytesPerWord) \
2426 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2427 \
2428 product(bool, TraceYoungGenTime, false, \
2429 "Trace accumulated time for young collection") \
2430 \
2431 product(bool, TraceOldGenTime, false, \
2432 "Trace accumulated time for old collection") \
2433 \
2434 product(bool, PrintHeapAtSIGBREAK, true, \
2435 "Print heap layout in response to SIGBREAK") \
2436 \
2437 manageable(bool, PrintClassHistogram, false, \
2438 "Print a histogram of class instances") \
2439 \
2440 develop(bool, TraceWorkGang, false, \
2441 "Trace activities of work gangs") \
2442 \
2443 develop(bool, TraceGCTaskManager, false, \
2444 "Trace actions of the GC task manager") \
2445 \
2446 develop(bool, TraceGCTaskQueue, false, \
2447 "Trace actions of the GC task queues") \
2448 \
2449 diagnostic(bool, TraceGCTaskThread, false, \
2450 "Trace actions of the GC task threads") \
2451 \
2452 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2453 "Trace marking phase in ParallelOldGC") \
2454 \
2455 develop(bool, TraceParallelOldGCDensePrefix, false, \
2456 "Trace dense prefix computation for ParallelOldGC") \
2457 \
2458 develop(bool, IgnoreLibthreadGPFault, false, \
2459 "Suppress workaround for libthread GP fault") \
2460 \
2461 experimental(double, ObjectCountCutOffPercent, 0.5, \
2462 "The percentage of the used heap that the instances of a class " \
2463 "must occupy for the class to generate a trace event") \
2464 range(0.0, 100.0) \
2465 \
2466 /* JVMTI heap profiling */ \
2467 \
2468 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2469 "Trace JVMTI object tagging calls") \
2470 \
2471 diagnostic(bool, VerifyBeforeIteration, false, \
2472 "Verify memory system before JVMTI iteration") \
2473 \
2474 /* compiler interface */ \
2475 \
2476 develop(bool, CIPrintCompilerName, false, \
2477 "when CIPrint is active, print the name of the active compiler") \
2478 \
2479 diagnostic(bool, CIPrintCompileQueue, false, \
2480 "display the contents of the compile queue whenever a " \
2481 "compilation is enqueued") \
2482 \
2483 develop(bool, CIPrintRequests, false, \
2484 "display every request for compilation") \
2485 \
2486 product(bool, CITime, false, \
2487 "collect timing information for compilation") \
2488 \
2489 develop(bool, CITimeVerbose, false, \
2490 "be more verbose in compilation timings") \
2491 \
2492 develop(bool, CITimeEach, false, \
2493 "display timing information after each successful compilation") \
2494 \
2495 develop(bool, CICountOSR, false, \
2496 "use a separate counter when assigning ids to osr compilations") \
2497 \
2498 develop(bool, CICompileNatives, true, \
2499 "compile native methods if supported by the compiler") \
2500 \
2501 develop_pd(bool, CICompileOSR, \
2502 "compile on stack replacement methods if supported by the " \
2503 "compiler") \
2504 \
2505 develop(bool, CIPrintMethodCodes, false, \
2506 "print method bytecodes of the compiled code") \
2507 \
2508 develop(bool, CIPrintTypeFlow, false, \
2509 "print the results of ciTypeFlow analysis") \
2510 \
2511 develop(bool, CITraceTypeFlow, false, \
2512 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2513 \
2514 develop(intx, OSROnlyBCI, -1, \
2515 "OSR only at this bci. Negative values mean exclude that bci") \
2516 \
2517 /* compiler */ \
2518 \
2519 /* notice: the max range value here is max_jint, not max_intx */ \
2520 /* because of overflow issue */ \
2521 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2522 "Number of compiler threads to run") \
2523 range(0, max_jint) \
2524 constraint(CICompilerCountConstraintFunc, AtParse) \
2525 \
2526 product(intx, CompilationPolicyChoice, 0, \
2527 "which compilation policy (0-3)") \
2528 range(0, 3) \
2529 \
2530 develop(bool, UseStackBanging, true, \
2531 "use stack banging for stack overflow checks (required for " \
2532 "proper StackOverflow handling; disable only to measure cost " \
2533 "of stackbanging)") \
2534 \
2535 develop(bool, UseStrictFP, true, \
2536 "use strict fp if modifier strictfp is set") \
2537 \
2538 develop(bool, GenerateSynchronizationCode, true, \
2539 "generate locking/unlocking code for synchronized methods and " \
2540 "monitors") \
2541 \
2542 develop(bool, GenerateCompilerNullChecks, true, \
2543 "Generate explicit null checks for loads/stores/calls") \
2544 \
2545 develop(bool, GenerateRangeChecks, true, \
2546 "Generate range checks for array accesses") \
2547 \
2548 develop_pd(bool, ImplicitNullChecks, \
2549 "Generate code for implicit null checks") \
2550 \
2551 product_pd(bool, TrapBasedNullChecks, \
2552 "Generate code for null checks that uses a cmp and trap " \
2553 "instruction raising SIGTRAP. This is only used if an access to" \
2554 "null (+offset) will not raise a SIGSEGV, i.e.," \
2555 "ImplicitNullChecks don't work (PPC64).") \
2556 \
2557 product(bool, PrintSafepointStatistics, false, \
2558 "Print statistics about safepoint synchronization") \
2559 \
2560 product(intx, PrintSafepointStatisticsCount, 300, \
2561 "Total number of safepoint statistics collected " \
2562 "before printing them out") \
2563 range(1, max_intx) \
2564 \
2565 product(intx, PrintSafepointStatisticsTimeout, -1, \
2566 "Print safepoint statistics only when safepoint takes " \
2567 "more than PrintSafepointSatisticsTimeout in millis") \
2568 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2569 NOT_LP64(range(-1, max_intx)) \
2570 \
2571 product(bool, TraceSafepointCleanupTime, false, \
2572 "Print the break down of clean up tasks performed during " \
2573 "safepoint") \
2574 \
2575 product(bool, Inline, true, \
2576 "Enable inlining") \
2577 \
2578 product(bool, ClipInlining, true, \
2579 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2580 \
2581 develop(bool, UseCHA, true, \
2582 "Enable CHA") \
2583 \
2584 product(bool, UseTypeProfile, true, \
2585 "Check interpreter profile for historically monomorphic calls") \
2586 \
2587 diagnostic(bool, PrintInlining, false, \
2588 "Print inlining optimizations") \
2589 \
2590 product(bool, UsePopCountInstruction, false, \
2591 "Use population count instruction") \
2592 \
2593 develop(bool, EagerInitialization, false, \
2594 "Eagerly initialize classes if possible") \
2595 \
2596 diagnostic(bool, LogTouchedMethods, false, \
2597 "Log methods which have been ever touched in runtime") \
2598 \
2599 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2600 "Print all methods that have been ever touched in runtime") \
2601 \
2602 develop(bool, TraceMethodReplacement, false, \
2603 "Print when methods are replaced do to recompilation") \
2604 \
2605 develop(bool, PrintMethodFlushing, false, \
2606 "Print the nmethods being flushed") \
2607 \
2608 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2609 "print statistics about method flushing") \
2610 \
2611 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2612 "Number of compiled code invocations after which " \
2613 "the method is considered as hot by the flusher") \
2614 range(1, max_jint) \
2615 \
2616 diagnostic(intx, MinPassesBeforeFlush, 10, \
2617 "Minimum number of sweeper passes before an nmethod " \
2618 "can be flushed") \
2619 range(0, max_intx) \
2620 \
2621 product(bool, UseCodeAging, true, \
2622 "Insert counter to detect warm methods") \
2623 \
2624 diagnostic(bool, StressCodeAging, false, \
2625 "Start with counters compiled in") \
2626 \
2627 develop(bool, UseRelocIndex, false, \
2628 "Use an index to speed random access to relocations") \
2629 \
2630 develop(bool, StressCodeBuffers, false, \
2631 "Exercise code buffer expansion and other rare state changes") \
2632 \
2633 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2634 "Generate extra debugging information for non-safepoints in " \
2635 "nmethods") \
2636 \
2637 product(bool, PrintVMOptions, false, \
2638 "Print flags that appeared on the command line") \
2639 \
2640 product(bool, IgnoreUnrecognizedVMOptions, false, \
2641 "Ignore unrecognized VM options") \
2642 \
2643 product(bool, PrintCommandLineFlags, false, \
2644 "Print flags specified on command line or set by ergonomics") \
2645 \
2646 product(bool, PrintFlagsInitial, false, \
2647 "Print all VM flags before argument processing and exit VM") \
2648 \
2649 product(bool, PrintFlagsFinal, false, \
2650 "Print all VM flags after argument and ergonomic processing") \
2651 \
2652 notproduct(bool, PrintFlagsWithComments, false, \
2653 "Print all VM flags with default values and descriptions and " \
2654 "exit") \
2655 \
2656 product(bool, PrintFlagsRanges, false, \
2657 "Print VM flags and their ranges and exit VM") \
2658 \
2659 diagnostic(bool, SerializeVMOutput, true, \
2660 "Use a mutex to serialize output to tty and LogFile") \
2661 \
2662 diagnostic(bool, DisplayVMOutput, true, \
2663 "Display all VM output on the tty, independently of LogVMOutput") \
2664 \
2665 diagnostic(bool, LogVMOutput, false, \
2666 "Save VM output to LogFile") \
2667 \
2668 diagnostic(ccstr, LogFile, NULL, \
2669 "If LogVMOutput or LogCompilation is on, save VM output to " \
2670 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2671 \
2672 product(ccstr, ErrorFile, NULL, \
2673 "If an error occurs, save the error data to this file " \
2674 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2675 \
2676 product(bool, DisplayVMOutputToStderr, false, \
2677 "If DisplayVMOutput is true, display all VM output to stderr") \
2678 \
2679 product(bool, DisplayVMOutputToStdout, false, \
2680 "If DisplayVMOutput is true, display all VM output to stdout") \
2681 \
2682 product(bool, UseHeavyMonitors, false, \
2683 "use heavyweight instead of lightweight Java monitors") \
2684 \
2685 product(bool, PrintStringTableStatistics, false, \
2686 "print statistics about the StringTable and SymbolTable") \
2687 \
2688 diagnostic(bool, VerifyStringTableAtExit, false, \
2689 "verify StringTable contents at exit") \
2690 \
2691 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2692 "print histogram of the symbol table") \
2693 \
2694 notproduct(bool, ExitVMOnVerifyError, false, \
2695 "standard exit from VM if bytecode verify error " \
2696 "(only in debug mode)") \
2697 \
2698 diagnostic(ccstr, AbortVMOnException, NULL, \
2699 "Call fatal if this exception is thrown. Example: " \
2700 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2701 \
2702 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2703 "Call fatal if the exception pointed by AbortVMOnException " \
2704 "has this message") \
2705 \
2706 develop(bool, DebugVtables, false, \
2707 "add debugging code to vtable dispatch") \
2708 \
2709 notproduct(bool, PrintVtableStats, false, \
2710 "print vtables stats at end of run") \
2711 \
2712 develop(bool, TraceCreateZombies, false, \
2713 "trace creation of zombie nmethods") \
2714 \
2715 notproduct(bool, IgnoreLockingAssertions, false, \
2716 "disable locking assertions (for speed)") \
2717 \
2718 product(bool, RangeCheckElimination, true, \
2719 "Eliminate range checks") \
2720 \
2721 develop_pd(bool, UncommonNullCast, \
2722 "track occurrences of null in casts; adjust compiler tactics") \
2723 \
2724 develop(bool, TypeProfileCasts, true, \
2725 "treat casts like calls for purposes of type profiling") \
2726 \
2727 develop(bool, DelayCompilationDuringStartup, true, \
2728 "Delay invoking the compiler until main application class is " \
2729 "loaded") \
2730 \
2731 develop(bool, CompileTheWorld, false, \
2732 "Compile all methods in all classes in bootstrap class path " \
2733 "(stress test)") \
2734 \
2735 develop(bool, CompileTheWorldPreloadClasses, true, \
2736 "Preload all classes used by a class before start loading") \
2737 \
2738 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2739 "Force a safepoint every n compiles so sweeper can keep up") \
2740 \
2741 develop(bool, FillDelaySlots, true, \
2742 "Fill delay slots (on SPARC only)") \
2743 \
2744 develop(bool, TimeLivenessAnalysis, false, \
2745 "Time computation of bytecode liveness analysis") \
2746 \
2747 develop(bool, TraceLivenessGen, false, \
2748 "Trace the generation of liveness analysis information") \
2749 \
2750 notproduct(bool, TraceLivenessQuery, false, \
2751 "Trace queries of liveness analysis information") \
2752 \
2753 notproduct(bool, CollectIndexSetStatistics, false, \
2754 "Collect information about IndexSets") \
2755 \
2756 develop(bool, UseLoopSafepoints, true, \
2757 "Generate Safepoint nodes in every loop") \
2758 \
2759 develop(intx, FastAllocateSizeLimit, 128*K, \
2760 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2761 "Inline allocations larger than this in doublewords must go slow")\
2762 \
2763 product(bool, AggressiveOpts, false, \
2764 "Enable aggressive optimizations - see arguments.cpp") \
2765 \
2766 product_pd(bool, CompactStrings, \
2767 "Enable Strings to use single byte chars in backing store") \
2768 \
2769 product_pd(uintx, TypeProfileLevel, \
2770 "=XYZ, with Z: Type profiling of arguments at call; " \
2771 "Y: Type profiling of return value at call; " \
2772 "X: Type profiling of parameters to methods; " \
2773 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2774 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2775 \
2776 product(intx, TypeProfileArgsLimit, 2, \
2777 "max number of call arguments to consider for type profiling") \
2778 range(0, 16) \
2779 \
2780 product(intx, TypeProfileParmsLimit, 2, \
2781 "max number of incoming parameters to consider for type profiling"\
2782 ", -1 for all") \
2783 range(-1, 64) \
2784 \
2785 /* statistics */ \
2786 develop(bool, CountCompiledCalls, false, \
2787 "Count method invocations") \
2788 \
2789 notproduct(bool, CountRuntimeCalls, false, \
2790 "Count VM runtime calls") \
2791 \
2792 develop(bool, CountJNICalls, false, \
2793 "Count jni method invocations") \
2794 \
2795 notproduct(bool, CountJVMCalls, false, \
2796 "Count jvm method invocations") \
2797 \
2798 notproduct(bool, CountRemovableExceptions, false, \
2799 "Count exceptions that could be replaced by branches due to " \
2800 "inlining") \
2801 \
2802 notproduct(bool, ICMissHistogram, false, \
2803 "Produce histogram of IC misses") \
2804 \
2805 /* interpreter */ \
2806 develop(bool, ClearInterpreterLocals, false, \
2807 "Always clear local variables of interpreter activations upon " \
2808 "entry") \
2809 \
2810 product_pd(bool, RewriteBytecodes, \
2811 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2812 \
2813 product_pd(bool, RewriteFrequentPairs, \
2814 "Rewrite frequently used bytecode pairs into a single bytecode") \
2815 \
2816 diagnostic(bool, PrintInterpreter, false, \
2817 "Print the generated interpreter code") \
2818 \
2819 product(bool, UseInterpreter, true, \
2820 "Use interpreter for non-compiled methods") \
2821 \
2822 develop(bool, UseFastSignatureHandlers, true, \
2823 "Use fast signature handlers for native calls") \
2824 \
2825 product(bool, UseLoopCounter, true, \
2826 "Increment invocation counter on backward branch") \
2827 \
2828 product_pd(bool, UseOnStackReplacement, \
2829 "Use on stack replacement, calls runtime if invoc. counter " \
2830 "overflows in loop") \
2831 \
2832 notproduct(bool, TraceOnStackReplacement, false, \
2833 "Trace on stack replacement") \
2834 \
2835 product_pd(bool, PreferInterpreterNativeStubs, \
2836 "Use always interpreter stubs for native methods invoked via " \
2837 "interpreter") \
2838 \
2839 develop(bool, CountBytecodes, false, \
2840 "Count number of bytecodes executed") \
2841 \
2842 develop(bool, PrintBytecodeHistogram, false, \
2843 "Print histogram of the executed bytecodes") \
2844 \
2845 develop(bool, PrintBytecodePairHistogram, false, \
2846 "Print histogram of the executed bytecode pairs") \
2847 \
2848 diagnostic(bool, PrintSignatureHandlers, false, \
2849 "Print code generated for native method signature handlers") \
2850 \
2851 develop(bool, VerifyOops, false, \
2852 "Do plausibility checks for oops") \
2853 \
2854 develop(bool, CheckUnhandledOops, false, \
2855 "Check for unhandled oops in VM code") \
2856 \
2857 develop(bool, VerifyJNIFields, trueInDebug, \
2858 "Verify jfieldIDs for instance fields") \
2859 \
2860 notproduct(bool, VerifyJNIEnvThread, false, \
2861 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2862 "from JNI") \
2863 \
2864 develop(bool, VerifyFPU, false, \
2865 "Verify FPU state (check for NaN's, etc.)") \
2866 \
2867 develop(bool, VerifyThread, false, \
2868 "Watch the thread register for corruption (SPARC only)") \
2869 \
2870 develop(bool, VerifyActivationFrameSize, false, \
2871 "Verify that activation frame didn't become smaller than its " \
2872 "minimal size") \
2873 \
2874 develop(bool, TraceFrequencyInlining, false, \
2875 "Trace frequency based inlining") \
2876 \
2877 develop_pd(bool, InlineIntrinsics, \
2878 "Inline intrinsics that can be statically resolved") \
2879 \
2880 product_pd(bool, ProfileInterpreter, \
2881 "Profile at the bytecode level during interpretation") \
2882 \
2883 develop(bool, TraceProfileInterpreter, false, \
2884 "Trace profiling at the bytecode level during interpretation. " \
2885 "This outputs the profiling information collected to improve " \
2886 "jit compilation.") \
2887 \
2888 develop_pd(bool, ProfileTraps, \
2889 "Profile deoptimization traps at the bytecode level") \
2890 \
2891 product(intx, ProfileMaturityPercentage, 20, \
2892 "number of method invocations/branches (expressed as % of " \
2893 "CompileThreshold) before using the method's profile") \
2894 range(0, 100) \
2895 \
2896 diagnostic(bool, PrintMethodData, false, \
2897 "Print the results of +ProfileInterpreter at end of run") \
2898 \
2899 develop(bool, VerifyDataPointer, trueInDebug, \
2900 "Verify the method data pointer during interpreter profiling") \
2901 \
2902 develop(bool, VerifyCompiledCode, false, \
2903 "Include miscellaneous runtime verifications in nmethod code; " \
2904 "default off because it disturbs nmethod size heuristics") \
2905 \
2906 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2907 "Manually make GC thread crash then dump java stack trace; " \
2908 "Test only") \
2909 \
2910 /* compilation */ \
2911 product(bool, UseCompiler, true, \
2912 "Use Just-In-Time compilation") \
2913 \
2914 develop(bool, TraceCompilationPolicy, false, \
2915 "Trace compilation policy") \
2916 \
2917 develop(bool, TimeCompilationPolicy, false, \
2918 "Time the compilation policy") \
2919 \
2920 product(bool, UseCounterDecay, true, \
2921 "Adjust recompilation counters") \
2922 \
2923 develop(intx, CounterHalfLifeTime, 30, \
2924 "Half-life time of invocation counters (in seconds)") \
2925 \
2926 develop(intx, CounterDecayMinIntervalLength, 500, \
2927 "The minimum interval (in milliseconds) between invocation of " \
2928 "CounterDecay") \
2929 \
2930 product(bool, AlwaysCompileLoopMethods, false, \
2931 "When using recompilation, never interpret methods " \
2932 "containing loops") \
2933 \
2934 product(bool, DontCompileHugeMethods, true, \
2935 "Do not compile methods > HugeMethodLimit") \
2936 \
2937 /* Bytecode escape analysis estimation. */ \
2938 product(bool, EstimateArgEscape, true, \
2939 "Analyze bytecodes to estimate escape state of arguments") \
2940 \
2941 product(intx, BCEATraceLevel, 0, \
2942 "How much tracing to do of bytecode escape analysis estimates " \
2943 "(0-3)") \
2944 range(0, 3) \
2945 \
2946 product(intx, MaxBCEAEstimateLevel, 5, \
2947 "Maximum number of nested calls that are analyzed by BC EA") \
2948 range(0, max_jint) \
2949 \
2950 product(intx, MaxBCEAEstimateSize, 150, \
2951 "Maximum bytecode size of a method to be analyzed by BC EA") \
2952 range(0, max_jint) \
2953 \
2954 product(intx, AllocatePrefetchStyle, 1, \
2955 "0 = no prefetch, " \
2956 "1 = prefetch instructions for each allocation, " \
2957 "2 = use TLAB watermark to gate allocation prefetch, " \
2958 "3 = use BIS instruction on Sparc for allocation prefetch") \
2959 range(0, 3) \
2960 \
2961 product(intx, AllocatePrefetchDistance, -1, \
2962 "Distance to prefetch ahead of allocation pointer. " \
2963 "-1: use system-specific value (automatically determined") \
2964 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2965 \
2966 product(intx, AllocatePrefetchLines, 3, \
2967 "Number of lines to prefetch ahead of array allocation pointer") \
2968 range(1, 64) \
2969 \
2970 product(intx, AllocateInstancePrefetchLines, 1, \
2971 "Number of lines to prefetch ahead of instance allocation " \
2972 "pointer") \
2973 range(1, 64) \
2974 \
2975 product(intx, AllocatePrefetchStepSize, 16, \
2976 "Step size in bytes of sequential prefetch instructions") \
2977 range(1, 512) \
2978 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2979 \
2980 product(intx, AllocatePrefetchInstr, 0, \
2981 "Prefetch instruction to prefetch ahead of allocation pointer") \
2982 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \
2983 \
2984 /* deoptimization */ \
2985 develop(bool, TraceDeoptimization, false, \
2986 "Trace deoptimization") \
2987 \
2988 develop(bool, PrintDeoptimizationDetails, false, \
2989 "Print more information about deoptimization") \
2990 \
2991 develop(bool, DebugDeoptimization, false, \
2992 "Tracing various information while debugging deoptimization") \
2993 \
2994 product(intx, SelfDestructTimer, 0, \
2995 "Will cause VM to terminate after a given time (in minutes) " \
2996 "(0 means off)") \
2997 range(0, max_intx) \
2998 \
2999 product(intx, MaxJavaStackTraceDepth, 1024, \
3000 "The maximum number of lines in the stack trace for Java " \
3001 "exceptions (0 means all)") \
3002 range(0, max_jint/2) \
3003 \
3004 develop(bool, TraceStackWalk, false, \
3005 "Trace stack walking") \
3006 \
3007 product(bool, MemberNameInStackFrame, true, \
3008 "Use MemberName in StackFrame") \
3009 \
3010 /* notice: the max range value here is max_jint, not max_intx */ \
3011 /* because of overflow issue */ \
3012 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3013 "Guarantee a safepoint (at least) every so many milliseconds " \
3014 "(0 means none)")) \
3015 NOT_EMBEDDED(range(0, max_jint)) \
3016 \
3017 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3018 "Guarantee a safepoint (at least) every so many milliseconds " \
3019 "(0 means none)")) \
3020 EMBEDDED_ONLY(range(0, max_jint)) \
3021 \
3022 product(intx, SafepointTimeoutDelay, 10000, \
3023 "Delay in milliseconds for option SafepointTimeout") \
3024 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
3025 NOT_LP64(range(0, max_intx)) \
3026 \
3027 product(intx, NmethodSweepActivity, 10, \
3028 "Removes cold nmethods from code cache if > 0. Higher values " \
3029 "result in more aggressive sweeping") \
3030 range(0, 2000) \
3031 \
3032 notproduct(bool, LogSweeper, false, \
3033 "Keep a ring buffer of sweeper activity") \
3034 \
3035 notproduct(intx, SweeperLogEntries, 1024, \
3036 "Number of records in the ring buffer of sweeper activity") \
3037 \
3038 notproduct(intx, MemProfilingInterval, 500, \
3039 "Time between each invocation of the MemProfiler") \
3040 \
3041 develop(intx, MallocCatchPtr, -1, \
3042 "Hit breakpoint when mallocing/freeing this pointer") \
3043 \
3044 notproduct(ccstrlist, SuppressErrorAt, "", \
3045 "List of assertions (file:line) to muzzle") \
3046 \
3047 notproduct(size_t, HandleAllocationLimit, 1024, \
3048 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3049 "is used") \
3050 \
3051 develop(size_t, TotalHandleAllocationLimit, 1024, \
3052 "Threshold for total handle allocation when " \
3053 "+TraceHandleAllocation is used") \
3054 \
3055 develop(intx, StackPrintLimit, 100, \
3056 "number of stack frames to print in VM-level stack dump") \
3057 \
3058 notproduct(intx, MaxElementPrintSize, 256, \
3059 "maximum number of elements to print") \
3060 \
3061 notproduct(intx, MaxSubklassPrintSize, 4, \
3062 "maximum number of subklasses to print when printing klass") \
3063 \
3064 product(intx, MaxInlineLevel, 9, \
3065 "maximum number of nested calls that are inlined") \
3066 range(0, max_jint) \
3067 \
3068 product(intx, MaxRecursiveInlineLevel, 1, \
3069 "maximum number of nested recursive calls that are inlined") \
3070 range(0, max_jint) \
3071 \
3072 develop(intx, MaxForceInlineLevel, 100, \
3073 "maximum number of nested calls that are forced for inlining " \
3074 "(using CompileCommand or marked w/ @ForceInline)") \
3075 range(0, max_jint) \
3076 \
3077 product_pd(intx, InlineSmallCode, \
3078 "Only inline already compiled methods if their code size is " \
3079 "less than this") \
3080 range(0, max_jint) \
3081 \
3082 product(intx, MaxInlineSize, 35, \
3083 "The maximum bytecode size of a method to be inlined") \
3084 range(0, max_jint) \
3085 \
3086 product_pd(intx, FreqInlineSize, \
3087 "The maximum bytecode size of a frequent method to be inlined") \
3088 range(0, max_jint) \
3089 \
3090 product(intx, MaxTrivialSize, 6, \
3091 "The maximum bytecode size of a trivial method to be inlined") \
3092 range(0, max_jint) \
3093 \
3094 product(intx, MinInliningThreshold, 250, \
3095 "The minimum invocation count a method needs to have to be " \
3096 "inlined") \
3097 range(0, max_jint) \
3098 \
3099 develop(intx, MethodHistogramCutoff, 100, \
3100 "The cutoff value for method invocation histogram (+CountCalls)") \
3101 \
3102 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3103 "Number of interpreted methods to show in profile") \
3104 \
3105 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3106 "Number of compiled methods to show in profile") \
3107 \
3108 develop(intx, ProfilerNumberOfStubMethods, 25, \
3109 "Number of stub methods to show in profile") \
3110 \
3111 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3112 "Number of runtime stub nodes to show in profile") \
3113 \
3114 product(intx, ProfileIntervalsTicks, 100, \
3115 "Number of ticks between printing of interval profile " \
3116 "(+ProfileIntervals)") \
3117 range(0, max_intx) \
3118 \
3119 notproduct(intx, ScavengeALotInterval, 1, \
3120 "Interval between which scavenge will occur with +ScavengeALot") \
3121 \
3122 notproduct(intx, FullGCALotInterval, 1, \
3123 "Interval between which full gc will occur with +FullGCALot") \
3124 \
3125 notproduct(intx, FullGCALotStart, 0, \
3126 "For which invocation to start FullGCAlot") \
3127 \
3128 notproduct(intx, FullGCALotDummies, 32*K, \
3129 "Dummy object allocated with +FullGCALot, forcing all objects " \
3130 "to move") \
3131 \
3132 develop(intx, DontYieldALotInterval, 10, \
3133 "Interval between which yields will be dropped (milliseconds)") \
3134 \
3135 develop(intx, MinSleepInterval, 1, \
3136 "Minimum sleep() interval (milliseconds) when " \
3137 "ConvertSleepToYield is off (used for Solaris)") \
3138 \
3139 develop(intx, ProfilerPCTickThreshold, 15, \
3140 "Number of ticks in a PC buckets to be a hotspot") \
3141 \
3142 notproduct(intx, DeoptimizeALotInterval, 5, \
3143 "Number of exits until DeoptimizeALot kicks in") \
3144 \
3145 notproduct(intx, ZombieALotInterval, 5, \
3146 "Number of exits until ZombieALot kicks in") \
3147 \
3148 diagnostic(intx, MallocVerifyInterval, 0, \
3149 "If non-zero, verify C heap after every N calls to " \
3150 "malloc/realloc/free") \
3151 range(0, max_intx) \
3152 \
3153 diagnostic(intx, MallocVerifyStart, 0, \
3154 "If non-zero, start verifying C heap after Nth call to " \
3155 "malloc/realloc/free") \
3156 range(0, max_intx) \
3157 \
3158 diagnostic(uintx, MallocMaxTestWords, 0, \
3159 "If non-zero, maximum number of words that malloc/realloc can " \
3160 "allocate (for testing only)") \
3161 range(0, max_uintx) \
3162 \
3163 product(intx, TypeProfileWidth, 2, \
3164 "Number of receiver types to record in call/cast profile") \
3165 range(0, 8) \
3166 \
3167 experimental(intx, MethodProfileWidth, 0, \
3168 "Number of methods to record in call profile") \
3169 \
3170 develop(intx, BciProfileWidth, 2, \
3171 "Number of return bci's to record in ret profile") \
3172 \
3173 product(intx, PerMethodRecompilationCutoff, 400, \
3174 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3175 range(-1, max_intx) \
3176 \
3177 product(intx, PerBytecodeRecompilationCutoff, 200, \
3178 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3179 range(-1, max_intx) \
3180 \
3181 product(intx, PerMethodTrapLimit, 100, \
3182 "Limit on traps (of one kind) in a method (includes inlines)") \
3183 range(0, max_jint) \
3184 \
3185 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3186 "Limit on speculative traps (of one kind) in a method " \
3187 "(includes inlines)") \
3188 range(0, max_jint) \
3189 \
3190 product(intx, PerBytecodeTrapLimit, 4, \
3191 "Limit on traps (of one kind) at a particular BCI") \
3192 range(0, max_jint) \
3193 \
3194 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3195 "Extra method data trap entries for speculation") \
3196 \
3197 develop(intx, InlineFrequencyRatio, 20, \
3198 "Ratio of call site execution to caller method invocation") \
3199 range(0, max_jint) \
3200 \
3201 develop_pd(intx, InlineFrequencyCount, \
3202 "Count of call site execution necessary to trigger frequent " \
3203 "inlining") \
3204 range(0, max_jint) \
3205 \
3206 develop(intx, InlineThrowCount, 50, \
3207 "Force inlining of interpreted methods that throw this often") \
3208 range(0, max_jint) \
3209 \
3210 develop(intx, InlineThrowMaxSize, 200, \
3211 "Force inlining of throwing methods smaller than this") \
3212 range(0, max_jint) \
3213 \
3214 develop(intx, ProfilerNodeSize, 1024, \
3215 "Size in K to allocate for the Profile Nodes of each thread") \
3216 range(0, 1024) \
3217 \
3218 /* gc parameters */ \
3219 product(size_t, InitialHeapSize, 0, \
3220 "Initial heap size (in bytes); zero means use ergonomics") \
3221 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3222 \
3223 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3224 "Maximum heap size (in bytes)") \
3225 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3226 \
3227 product(size_t, OldSize, ScaleForWordSize(4*M), \
3228 "Initial tenured generation size (in bytes)") \
3229 range(0, max_uintx) \
3230 \
3231 product(size_t, NewSize, ScaleForWordSize(1*M), \
3232 "Initial new generation size (in bytes)") \
3233 constraint(NewSizeConstraintFunc,AfterErgo) \
3234 \
3235 product(size_t, MaxNewSize, max_uintx, \
3236 "Maximum new generation size (in bytes), max_uintx means set " \
3237 "ergonomically") \
3238 range(0, max_uintx) \
3239 \
3240 product_pd(size_t, HeapBaseMinAddress, \
3241 "OS specific low limit for heap base address") \
3242 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3243 \
3244 product(size_t, PretenureSizeThreshold, 0, \
3245 "Maximum size in bytes of objects allocated in DefNew " \
3246 "generation; zero means no maximum") \
3247 range(0, max_uintx) \
3248 \
3249 product(size_t, MinTLABSize, 2*K, \
3250 "Minimum allowed TLAB size (in bytes)") \
3251 range(1, max_uintx/2) \
3252 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3253 \
3254 product(size_t, TLABSize, 0, \
3255 "Starting TLAB size (in bytes); zero means set ergonomically") \
3256 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3257 \
3258 product(size_t, YoungPLABSize, 4096, \
3259 "Size of young gen promotion LAB's (in HeapWords)") \
3260 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3261 \
3262 product(size_t, OldPLABSize, 1024, \
3263 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3264 "of blocks to attempt to claim when refilling CMS LAB's") \
3265 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3266 \
3267 product(uintx, TLABAllocationWeight, 35, \
3268 "Allocation averaging weight") \
3269 range(0, 100) \
3270 \
3271 /* Limit the lower bound of this flag to 1 as it is used */ \
3272 /* in a division expression. */ \
3273 product(uintx, TLABWasteTargetPercent, 1, \
3274 "Percentage of Eden that can be wasted") \
3275 range(1, 100) \
3276 \
3277 product(uintx, TLABRefillWasteFraction, 64, \
3278 "Maximum TLAB waste at a refill (internal fragmentation)") \
3279 range(1, max_juint) \
3280 \
3281 product(uintx, TLABWasteIncrement, 4, \
3282 "Increment allowed waste at slow allocation") \
3283 range(0, max_jint) \
3284 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3285 \
3286 product(uintx, SurvivorRatio, 8, \
3287 "Ratio of eden/survivor space size") \
3288 range(1, max_uintx-2) \
3289 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3290 \
3291 product(uintx, NewRatio, 2, \
3292 "Ratio of old/new generation sizes") \
3293 range(0, max_uintx-1) \
3294 \
3295 product_pd(size_t, NewSizeThreadIncrease, \
3296 "Additional size added to desired new generation size per " \
3297 "non-daemon thread (in bytes)") \
3298 range(0, max_uintx) \
3299 \
3300 product_pd(size_t, MetaspaceSize, \
3301 "Initial size of Metaspaces (in bytes)") \
3302 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3303 \
3304 product(size_t, MaxMetaspaceSize, max_uintx, \
3305 "Maximum size of Metaspaces (in bytes)") \
3306 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3307 \
3308 product(size_t, CompressedClassSpaceSize, 1*G, \
3309 "Maximum size of class area in Metaspace when compressed " \
3310 "class pointers are used") \
3311 range(1*M, 3*G) \
3312 \
3313 manageable(uintx, MinHeapFreeRatio, 40, \
3314 "The minimum percentage of heap free after GC to avoid expansion."\
3315 " For most GCs this applies to the old generation. In G1 and" \
3316 " ParallelGC it applies to the whole heap.") \
3317 range(0, 100) \
3318 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3319 \
3320 manageable(uintx, MaxHeapFreeRatio, 70, \
3321 "The maximum percentage of heap free after GC to avoid shrinking."\
3322 " For most GCs this applies to the old generation. In G1 and" \
3323 " ParallelGC it applies to the whole heap.") \
3324 range(0, 100) \
3325 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3326 \
3327 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3328 "Number of milliseconds per MB of free space in the heap") \
3329 range(0, max_intx) \
3330 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3331 \
3332 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3333 "The minimum change in heap space due to GC (in bytes)") \
3334 range(0, max_uintx) \
3335 \
3336 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3337 "The minimum expansion of Metaspace (in bytes)") \
3338 range(0, max_uintx) \
3339 \
3340 product(uintx, MaxMetaspaceFreeRatio, 70, \
3341 "The maximum percentage of Metaspace free after GC to avoid " \
3342 "shrinking") \
3343 range(0, 100) \
3344 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3345 \
3346 product(uintx, MinMetaspaceFreeRatio, 40, \
3347 "The minimum percentage of Metaspace free after GC to avoid " \
3348 "expansion") \
3349 range(0, 99) \
3350 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3351 \
3352 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3353 "The maximum expansion of Metaspace without full GC (in bytes)") \
3354 range(0, max_uintx) \
3355 \
3356 product(uintx, QueuedAllocationWarningCount, 0, \
3357 "Number of times an allocation that queues behind a GC " \
3358 "will retry before printing a warning") \
3359 range(0, max_uintx) \
3360 \
3361 diagnostic(uintx, VerifyGCStartAt, 0, \
3362 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3363 range(0, max_uintx) \
3364 \
3365 diagnostic(intx, VerifyGCLevel, 0, \
3366 "Generation level at which to start +VerifyBefore/AfterGC") \
3367 range(0, 1) \
3368 \
3369 product(uintx, MaxTenuringThreshold, 15, \
3370 "Maximum value for tenuring threshold") \
3371 range(0, markOopDesc::max_age + 1) \
3372 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3373 \
3374 product(uintx, InitialTenuringThreshold, 7, \
3375 "Initial value for tenuring threshold") \
3376 range(0, markOopDesc::max_age + 1) \
3377 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3378 \
3379 product(uintx, TargetSurvivorRatio, 50, \
3380 "Desired percentage of survivor space used after scavenge") \
3381 range(0, 100) \
3382 \
3383 product(uintx, MarkSweepDeadRatio, 5, \
3384 "Percentage (0-100) of the old gen allowed as dead wood. " \
3385 "Serial mark sweep treats this as both the minimum and maximum " \
3386 "value. " \
3387 "CMS uses this value only if it falls back to mark sweep. " \
3388 "Par compact uses a variable scale based on the density of the " \
3389 "generation and treats this as the maximum value when the heap " \
3390 "is either completely full or completely empty. Par compact " \
3391 "also has a smaller default value; see arguments.cpp.") \
3392 range(0, 100) \
3393 \
3394 product(uint, MarkSweepAlwaysCompactCount, 4, \
3395 "How often should we fully compact the heap (ignoring the dead " \
3396 "space parameters)") \
3397 range(1, max_juint) \
3398 \
3399 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3400 "Delay between expansion and allocation (in milliseconds)") \
3401 \
3402 develop(uintx, GCWorkerDelayMillis, 0, \
3403 "Delay in scheduling GC workers (in milliseconds)") \
3404 \
3405 product(intx, DeferThrSuspendLoopCount, 4000, \
3406 "(Unstable) Number of times to iterate in safepoint loop " \
3407 "before blocking VM threads ") \
3408 range(-1, max_jint-1) \
3409 \
3410 product(intx, DeferPollingPageLoopCount, -1, \
3411 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3412 "before changing safepoint polling page to RO ") \
3413 range(-1, max_jint-1) \
3414 \
3415 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3416 range(0, max_intx) \
3417 \
3418 product(bool, PSChunkLargeArrays, true, \
3419 "Process large arrays in chunks") \
3420 \
3421 product(uintx, GCDrainStackTargetSize, 64, \
3422 "Number of entries we will try to leave on the stack " \
3423 "during parallel gc") \
3424 range(0, max_juint) \
3425 \
3426 /* stack parameters */ \
3427 product_pd(intx, StackYellowPages, \
3428 "Number of yellow zone (recoverable overflows) pages of size " \
3429 "4KB. If pages are bigger yellow zone is aligned up.") \
3430 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3431 \
3432 product_pd(intx, StackRedPages, \
3433 "Number of red zone (unrecoverable overflows) pages of size " \
3434 "4KB. If pages are bigger red zone is aligned up.") \
3435 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3436 \
3437 product_pd(intx, StackReservedPages, \
3438 "Number of reserved zone (reserved to annotated methods) pages" \
3439 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3440 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3441 \
3442 product(bool, RestrictReservedStack, true, \
3443 "Restrict @ReservedStackAccess to trusted classes") \
3444 \
3445 /* greater stack shadow pages can't generate instruction to bang stack */ \
3446 product_pd(intx, StackShadowPages, \
3447 "Number of shadow zone (for overflow checking) pages of size " \
3448 "4KB. If pages are bigger shadow zone is aligned up. " \
3449 "This should exceed the depth of the VM and native call stack.") \
3450 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3451 \
3452 product_pd(intx, ThreadStackSize, \
3453 "Thread Stack Size (in Kbytes)") \
3454 range(0, (max_intx-os::vm_page_size())/(1 * K)) \
3455 \
3456 product_pd(intx, VMThreadStackSize, \
3457 "Non-Java Thread Stack Size (in Kbytes)") \
3458 range(0, max_intx/(1 * K)) \
3459 \
3460 product_pd(intx, CompilerThreadStackSize, \
3461 "Compiler Thread Stack Size (in Kbytes)") \
3462 range(0, max_intx/(1 * K)) \
3463 \
3464 develop_pd(size_t, JVMInvokeMethodSlack, \
3465 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3466 \
3467 /* code cache parameters */ \
3468 /* ppc64/tiered compilation has large code-entry alignment. */ \
3469 develop(uintx, CodeCacheSegmentSize, \
3470 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \
3471 "Code cache segment size (in bytes) - smallest unit of " \
3472 "allocation") \
3473 range(1, 1024) \
3474 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3475 \
3476 develop_pd(intx, CodeEntryAlignment, \
3477 "Code entry alignment for generated code (in bytes)") \
3478 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3479 \
3480 product_pd(intx, OptoLoopAlignment, \
3481 "Align inner loops to zero relative to this modulus") \
3482 range(1, 16) \
3483 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3484 \
3485 product_pd(uintx, InitialCodeCacheSize, \
3486 "Initial code cache size (in bytes)") \
3487 range(0, max_uintx) \
3488 \
3489 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3490 "Minimum code cache size (in bytes) required to start VM.") \
3491 range(0, max_uintx) \
3492 \
3493 product(bool, SegmentedCodeCache, false, \
3494 "Use a segmented code cache") \
3495 \
3496 product_pd(uintx, ReservedCodeCacheSize, \
3497 "Reserved code cache size (in bytes) - maximum code cache size") \
3498 range(0, max_uintx) \
3499 \
3500 product_pd(uintx, NonProfiledCodeHeapSize, \
3501 "Size of code heap with non-profiled methods (in bytes)") \
3502 range(0, max_uintx) \
3503 \
3504 product_pd(uintx, ProfiledCodeHeapSize, \
3505 "Size of code heap with profiled methods (in bytes)") \
3506 range(0, max_uintx) \
3507 \
3508 product_pd(uintx, NonNMethodCodeHeapSize, \
3509 "Size of code heap with non-nmethods (in bytes)") \
3510 range(0, max_uintx) \
3511 \
3512 product_pd(uintx, CodeCacheExpansionSize, \
3513 "Code cache expansion size (in bytes)") \
3514 range(0, max_uintx) \
3515 \
3516 develop_pd(uintx, CodeCacheMinBlockLength, \
3517 "Minimum number of segments in a code cache block") \
3518 range(1, 100) \
3519 \
3520 notproduct(bool, ExitOnFullCodeCache, false, \
3521 "Exit the VM if we fill the code cache") \
3522 \
3523 product(bool, UseCodeCacheFlushing, true, \
3524 "Remove cold/old nmethods from the code cache") \
3525 \
3526 product(uintx, StartAggressiveSweepingAt, 10, \
3527 "Start aggressive sweeping if X[%] of the code cache is free." \
3528 "Segmented code cache: X[%] of the non-profiled heap." \
3529 "Non-segmented code cache: X[%] of the total code cache") \
3530 range(0, 100) \
3531 \
3532 /* interpreter debugging */ \
3533 develop(intx, BinarySwitchThreshold, 5, \
3534 "Minimal number of lookupswitch entries for rewriting to binary " \
3535 "switch") \
3536 \
3537 develop(intx, StopInterpreterAt, 0, \
3538 "Stop interpreter execution at specified bytecode number") \
3539 \
3540 develop(intx, TraceBytecodesAt, 0, \
3541 "Trace bytecodes starting with specified bytecode number") \
3542 \
3543 /* compiler interface */ \
3544 develop(intx, CIStart, 0, \
3545 "The id of the first compilation to permit") \
3546 \
3547 develop(intx, CIStop, max_jint, \
3548 "The id of the last compilation to permit") \
3549 \
3550 develop(intx, CIStartOSR, 0, \
3551 "The id of the first osr compilation to permit " \
3552 "(CICountOSR must be on)") \
3553 \
3554 develop(intx, CIStopOSR, max_jint, \
3555 "The id of the last osr compilation to permit " \
3556 "(CICountOSR must be on)") \
3557 \
3558 develop(intx, CIBreakAtOSR, -1, \
3559 "The id of osr compilation to break at") \
3560 \
3561 develop(intx, CIBreakAt, -1, \
3562 "The id of compilation to break at") \
3563 \
3564 product(ccstrlist, CompileOnly, "", \
3565 "List of methods (pkg/class.name) to restrict compilation to") \
3566 \
3567 product(ccstr, CompileCommandFile, NULL, \
3568 "Read compiler commands from this file [.hotspot_compiler]") \
3569 \
3570 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3571 "Read compiler directives from this file") \
3572 \
3573 product(ccstrlist, CompileCommand, "", \
3574 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3575 \
3576 develop(bool, ReplayCompiles, false, \
3577 "Enable replay of compilations from ReplayDataFile") \
3578 \
3579 product(ccstr, ReplayDataFile, NULL, \
3580 "File containing compilation replay information" \
3581 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3582 \
3583 product(ccstr, InlineDataFile, NULL, \
3584 "File containing inlining replay information" \
3585 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3586 \
3587 develop(intx, ReplaySuppressInitializers, 2, \
3588 "Control handling of class initialization during replay: " \
3589 "0 - don't do anything special; " \
3590 "1 - treat all class initializers as empty; " \
3591 "2 - treat class initializers for application classes as empty; " \
3592 "3 - allow all class initializers to run during bootstrap but " \
3593 " pretend they are empty after starting replay") \
3594 range(0, 3) \
3595 \
3596 develop(bool, ReplayIgnoreInitErrors, false, \
3597 "Ignore exceptions thrown during initialization for replay") \
3598 \
3599 product(bool, DumpReplayDataOnError, true, \
3600 "Record replay data for crashing compiler threads") \
3601 \
3602 product(bool, CICompilerCountPerCPU, false, \
3603 "1 compiler thread for log(N CPUs)") \
3604 \
3605 develop(intx, CIFireOOMAt, -1, \
3606 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3607 "(non-negative value throws OOM after this many CI accesses " \
3608 "in each compile)") \
3609 notproduct(intx, CICrashAt, -1, \
3610 "id of compilation to trigger assert in compiler thread for " \
3611 "the purpose of testing, e.g. generation of replay data") \
3612 notproduct(bool, CIObjectFactoryVerify, false, \
3613 "enable potentially expensive verification in ciObjectFactory") \
3614 \
3615 /* Priorities */ \
3616 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3617 \
3618 product(intx, ThreadPriorityPolicy, 0, \
3619 "0 : Normal. "\
3620 " VM chooses priorities that are appropriate for normal "\
3621 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3622 " to normal native priority. Java priorities below " \
3623 " NORM_PRIORITY map to lower native priority values. On "\
3624 " Windows applications are allowed to use higher native "\
3625 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3626 " not use the highest possible native priority, "\
3627 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3628 " system threads. On Linux thread priorities are ignored "\
3629 " because the OS does not support static priority in "\
3630 " SCHED_OTHER scheduling class which is the only choice for "\
3631 " non-root, non-realtime applications. "\
3632 "1 : Aggressive. "\
3633 " Java thread priorities map over to the entire range of "\
3634 " native thread priorities. Higher Java thread priorities map "\
3635 " to higher native thread priorities. This policy should be "\
3636 " used with care, as sometimes it can cause performance "\
3637 " degradation in the application and/or the entire system. On "\
3638 " Linux this policy requires root privilege.") \
3639 range(0, 1) \
3640 \
3641 product(bool, ThreadPriorityVerbose, false, \
3642 "Print priority changes") \
3643 \
3644 product(intx, CompilerThreadPriority, -1, \
3645 "The native priority at which compiler threads should run " \
3646 "(-1 means no change)") \
3647 range(min_jint, max_jint) \
3648 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3649 \
3650 product(intx, VMThreadPriority, -1, \
3651 "The native priority at which the VM thread should run " \
3652 "(-1 means no change)") \
3653 range(-1, 127) \
3654 \
3655 product(bool, CompilerThreadHintNoPreempt, true, \
3656 "(Solaris only) Give compiler threads an extra quanta") \
3657 \
3658 product(bool, VMThreadHintNoPreempt, false, \
3659 "(Solaris only) Give VM thread an extra quanta") \
3660 \
3661 product(intx, JavaPriority1_To_OSPriority, -1, \
3662 "Map Java priorities to OS priorities") \
3663 range(-1, 127) \
3664 \
3665 product(intx, JavaPriority2_To_OSPriority, -1, \
3666 "Map Java priorities to OS priorities") \
3667 range(-1, 127) \
3668 \
3669 product(intx, JavaPriority3_To_OSPriority, -1, \
3670 "Map Java priorities to OS priorities") \
3671 range(-1, 127) \
3672 \
3673 product(intx, JavaPriority4_To_OSPriority, -1, \
3674 "Map Java priorities to OS priorities") \
3675 range(-1, 127) \
3676 \
3677 product(intx, JavaPriority5_To_OSPriority, -1, \
3678 "Map Java priorities to OS priorities") \
3679 range(-1, 127) \
3680 \
3681 product(intx, JavaPriority6_To_OSPriority, -1, \
3682 "Map Java priorities to OS priorities") \
3683 range(-1, 127) \
3684 \
3685 product(intx, JavaPriority7_To_OSPriority, -1, \
3686 "Map Java priorities to OS priorities") \
3687 range(-1, 127) \
3688 \
3689 product(intx, JavaPriority8_To_OSPriority, -1, \
3690 "Map Java priorities to OS priorities") \
3691 range(-1, 127) \
3692 \
3693 product(intx, JavaPriority9_To_OSPriority, -1, \
3694 "Map Java priorities to OS priorities") \
3695 range(-1, 127) \
3696 \
3697 product(intx, JavaPriority10_To_OSPriority,-1, \
3698 "Map Java priorities to OS priorities") \
3699 range(-1, 127) \
3700 \
3701 experimental(bool, UseCriticalJavaThreadPriority, false, \
3702 "Java thread priority 10 maps to critical scheduling priority") \
3703 \
3704 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3705 "Compiler thread(s) run at critical scheduling priority") \
3706 \
3707 experimental(bool, UseCriticalCMSThreadPriority, false, \
3708 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3709 \
3710 /* compiler debugging */ \
3711 notproduct(intx, CompileTheWorldStartAt, 1, \
3712 "First class to consider when using +CompileTheWorld") \
3713 \
3714 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3715 "Last class to consider when using +CompileTheWorld") \
3716 \
3717 develop(intx, NewCodeParameter, 0, \
3718 "Testing Only: Create a dedicated integer parameter before " \
3719 "putback") \
3720 \
3721 /* new oopmap storage allocation */ \
3722 develop(intx, MinOopMapAllocation, 8, \
3723 "Minimum number of OopMap entries in an OopMapSet") \
3724 \
3725 /* Background Compilation */ \
3726 develop(intx, LongCompileThreshold, 50, \
3727 "Used with +TraceLongCompiles") \
3728 \
3729 /* recompilation */ \
3730 product_pd(intx, CompileThreshold, \
3731 "number of interpreted method invocations before (re-)compiling") \
3732 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3733 \
3734 product(double, CompileThresholdScaling, 1.0, \
3735 "Factor to control when first compilation happens " \
3736 "(both with and without tiered compilation): " \
3737 "values greater than 1.0 delay counter overflow, " \
3738 "values between 0 and 1.0 rush counter overflow, " \
3739 "value of 1.0 leaves compilation thresholds unchanged " \
3740 "value of 0.0 is equivalent to -Xint. " \
3741 "" \
3742 "Flag can be set as per-method option. " \
3743 "If a value is specified for a method, compilation thresholds " \
3744 "for that method are scaled by both the value of the global flag "\
3745 "and the value of the per-method flag.") \
3746 range(0.0, DBL_MAX) \
3747 \
3748 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3749 "Interpreter (tier 0) invocation notification frequency") \
3750 range(0, 30) \
3751 \
3752 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3753 "C1 without MDO (tier 2) invocation notification frequency") \
3754 range(0, 30) \
3755 \
3756 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3757 "C1 with MDO profiling (tier 3) invocation notification " \
3758 "frequency") \
3759 range(0, 30) \
3760 \
3761 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3762 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3763 range(0, 30) \
3764 \
3765 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3766 "Interpreter (tier 0) invocation notification frequency") \
3767 range(0, 30) \
3768 \
3769 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3770 "C1 without MDO (tier 2) invocation notification frequency") \
3771 range(0, 30) \
3772 \
3773 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3774 "C1 with MDO profiling (tier 3) invocation notification " \
3775 "frequency") \
3776 range(0, 30) \
3777 \
3778 product(intx, Tier2CompileThreshold, 0, \
3779 "threshold at which tier 2 compilation is invoked") \
3780 range(0, max_jint) \
3781 \
3782 product(intx, Tier2BackEdgeThreshold, 0, \
3783 "Back edge threshold at which tier 2 compilation is invoked") \
3784 range(0, max_jint) \
3785 \
3786 product(intx, Tier3InvocationThreshold, 200, \
3787 "Compile if number of method invocations crosses this " \
3788 "threshold") \
3789 range(0, max_jint) \
3790 \
3791 product(intx, Tier3MinInvocationThreshold, 100, \
3792 "Minimum invocation to compile at tier 3") \
3793 range(0, max_jint) \
3794 \
3795 product(intx, Tier3CompileThreshold, 2000, \
3796 "Threshold at which tier 3 compilation is invoked (invocation " \
3797 "minimum must be satisfied)") \
3798 range(0, max_jint) \
3799 \
3800 product(intx, Tier3BackEdgeThreshold, 60000, \
3801 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3802 range(0, max_jint) \
3803 \
3804 product(intx, Tier4InvocationThreshold, 5000, \
3805 "Compile if number of method invocations crosses this " \
3806 "threshold") \
3807 range(0, max_jint) \
3808 \
3809 product(intx, Tier4MinInvocationThreshold, 600, \
3810 "Minimum invocation to compile at tier 4") \
3811 range(0, max_jint) \
3812 \
3813 product(intx, Tier4CompileThreshold, 15000, \
3814 "Threshold at which tier 4 compilation is invoked (invocation " \
3815 "minimum must be satisfied") \
3816 range(0, max_jint) \
3817 \
3818 product(intx, Tier4BackEdgeThreshold, 40000, \
3819 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3820 range(0, max_jint) \
3821 \
3822 product(intx, Tier3DelayOn, 5, \
3823 "If C2 queue size grows over this amount per compiler thread " \
3824 "stop compiling at tier 3 and start compiling at tier 2") \
3825 range(0, max_jint) \
3826 \
3827 product(intx, Tier3DelayOff, 2, \
3828 "If C2 queue size is less than this amount per compiler thread " \
3829 "allow methods compiled at tier 2 transition to tier 3") \
3830 range(0, max_jint) \
3831 \
3832 product(intx, Tier3LoadFeedback, 5, \
3833 "Tier 3 thresholds will increase twofold when C1 queue size " \
3834 "reaches this amount per compiler thread") \
3835 range(0, max_jint) \
3836 \
3837 product(intx, Tier4LoadFeedback, 3, \
3838 "Tier 4 thresholds will increase twofold when C2 queue size " \
3839 "reaches this amount per compiler thread") \
3840 range(0, max_jint) \
3841 \
3842 product(intx, TieredCompileTaskTimeout, 50, \
3843 "Kill compile task if method was not used within " \
3844 "given timeout in milliseconds") \
3845 range(0, max_intx) \
3846 \
3847 product(intx, TieredStopAtLevel, 4, \
3848 "Stop at given compilation level") \
3849 range(0, 4) \
3850 \
3851 product(intx, Tier0ProfilingStartPercentage, 200, \
3852 "Start profiling in interpreter if the counters exceed tier 3 " \
3853 "thresholds by the specified percentage") \
3854 range(0, max_jint) \
3855 \
3856 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3857 "Increase the compile threshold for C1 compilation if the code " \
3858 "cache is filled by the specified percentage") \
3859 range(0, 99) \
3860 \
3861 product(intx, TieredRateUpdateMinTime, 1, \
3862 "Minimum rate sampling interval (in milliseconds)") \
3863 range(0, max_intx) \
3864 \
3865 product(intx, TieredRateUpdateMaxTime, 25, \
3866 "Maximum rate sampling interval (in milliseconds)") \
3867 range(0, max_intx) \
3868 \
3869 product_pd(bool, TieredCompilation, \
3870 "Enable tiered compilation") \
3871 \
3872 product(bool, PrintTieredEvents, false, \
3873 "Print tiered events notifications") \
3874 \
3875 product_pd(intx, OnStackReplacePercentage, \
3876 "NON_TIERED number of method invocations/branches (expressed as " \
3877 "% of CompileThreshold) before (re-)compiling OSR code") \
3878 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3879 \
3880 product(intx, InterpreterProfilePercentage, 33, \
3881 "NON_TIERED number of method invocations/branches (expressed as " \
3882 "% of CompileThreshold) before profiling in the interpreter") \
3883 range(0, 100) \
3884 \
3885 develop(intx, MaxRecompilationSearchLength, 10, \
3886 "The maximum number of frames to inspect when searching for " \
3887 "recompilee") \
3888 \
3889 develop(intx, MaxInterpretedSearchLength, 3, \
3890 "The maximum number of interpreted frames to skip when searching "\
3891 "for recompilee") \
3892 \
3893 develop(intx, DesiredMethodLimit, 8000, \
3894 "The desired maximum method size (in bytecodes) after inlining") \
3895 \
3896 develop(intx, HugeMethodLimit, 8000, \
3897 "Don't compile methods larger than this if " \
3898 "+DontCompileHugeMethods") \
3899 \
3900 /* New JDK 1.4 reflection implementation */ \
3901 \
3902 develop(intx, FastSuperclassLimit, 8, \
3903 "Depth of hardwired instanceof accelerator array") \
3904 \
3905 /* Properties for Java libraries */ \
3906 \
3907 product(size_t, MaxDirectMemorySize, 0, \
3908 "Maximum total size of NIO direct-buffer allocations") \
3909 range(0, (size_t)SIZE_MAX) \
3910 \
3911 /* Flags used for temporary code during development */ \
3912 \
3913 diagnostic(bool, UseNewCode, false, \
3914 "Testing Only: Use the new version while testing") \
3915 \
3916 diagnostic(bool, UseNewCode2, false, \
3917 "Testing Only: Use the new version while testing") \
3918 \
3919 diagnostic(bool, UseNewCode3, false, \
3920 "Testing Only: Use the new version while testing") \
3921 \
3922 /* flags for performance data collection */ \
3923 \
3924 product(bool, UsePerfData, falseInEmbedded, \
3925 "Flag to disable jvmstat instrumentation for performance testing "\
3926 "and problem isolation purposes") \
3927 \
3928 product(bool, PerfDataSaveToFile, false, \
3929 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3930 \
3931 product(ccstr, PerfDataSaveFile, NULL, \
3932 "Save PerfData memory to the specified absolute pathname. " \
3933 "The string %p in the file name (if present) " \
3934 "will be replaced by pid") \
3935 \
3936 product(intx, PerfDataSamplingInterval, 50, \
3937 "Data sampling interval (in milliseconds)") \
3938 range(PeriodicTask::min_interval, max_jint) \
3939 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3940 \
3941 develop(bool, PerfTraceDataCreation, false, \
3942 "Trace creation of Performance Data Entries") \
3943 \
3944 develop(bool, PerfTraceMemOps, false, \
3945 "Trace PerfMemory create/attach/detach calls") \
3946 \
3947 product(bool, PerfDisableSharedMem, false, \
3948 "Store performance data in standard memory") \
3949 \
3950 product(intx, PerfDataMemorySize, 32*K, \
3951 "Size of performance data memory region. Will be rounded " \
3952 "up to a multiple of the native os page size.") \
3953 range(128, 32*64*K) \
3954 \
3955 product(intx, PerfMaxStringConstLength, 1024, \
3956 "Maximum PerfStringConstant string length before truncation") \
3957 range(32, 32*K) \
3958 \
3959 product(bool, PerfAllowAtExitRegistration, false, \
3960 "Allow registration of atexit() methods") \
3961 \
3962 product(bool, PerfBypassFileSystemCheck, false, \
3963 "Bypass Win32 file system criteria checks (Windows Only)") \
3964 \
3965 product(intx, UnguardOnExecutionViolation, 0, \
3966 "Unguard page and retry on no-execute fault (Win32 only) " \
3967 "0=off, 1=conservative, 2=aggressive") \
3968 range(0, 2) \
3969 \
3970 /* Serviceability Support */ \
3971 \
3972 product(bool, ManagementServer, false, \
3973 "Create JMX Management Server") \
3974 \
3975 product(bool, DisableAttachMechanism, false, \
3976 "Disable mechanism that allows tools to attach to this VM") \
3977 \
3978 product(bool, StartAttachListener, false, \
3979 "Always start Attach Listener at VM startup") \
3980 \
3981 manageable(bool, PrintConcurrentLocks, false, \
3982 "Print java.util.concurrent locks in thread dump") \
3983 \
3984 product(bool, TransmitErrorReport, false, \
3985 "Enable error report transmission on erroneous termination") \
3986 \
3987 product(ccstr, ErrorReportServer, NULL, \
3988 "Override built-in error report server address") \
3989 \
3990 /* Shared spaces */ \
3991 \
3992 product(bool, UseSharedSpaces, true, \
3993 "Use shared spaces for metadata") \
3994 \
3995 product(bool, VerifySharedSpaces, false, \
3996 "Verify shared spaces (false for default archive, true for " \
3997 "archive specified by -XX:SharedArchiveFile)") \
3998 \
3999 product(bool, RequireSharedSpaces, false, \
4000 "Require shared spaces for metadata") \
4001 \
4002 product(bool, DumpSharedSpaces, false, \
4003 "Special mode: JVM reads a class list, loads classes, builds " \
4004 "shared spaces, and dumps the shared spaces to a file to be " \
4005 "used in future JVM runs") \
4006 \
4007 product(bool, PrintSharedSpaces, false, \
4008 "Print usage of shared spaces") \
4009 \
4010 product(bool, PrintSharedArchiveAndExit, false, \
4011 "Print shared archive file contents") \
4012 \
4013 product(bool, PrintSharedDictionary, false, \
4014 "If PrintSharedArchiveAndExit is true, also print the shared " \
4015 "dictionary") \
4016 \
4017 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \
4018 "Size of read-write space for metadata (in bytes)") \
4019 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \
4020 \
4021 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \
4022 "Size of read-only space for metadata (in bytes)") \
4023 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \
4024 \
4025 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \
4026 "Size of the shared miscellaneous data area (in bytes)") \
4027 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \
4028 \
4029 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \
4030 "Size of the shared miscellaneous code area (in bytes)") \
4031 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \
4032 \
4033 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
4034 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4035 "Address to allocate shared memory region for class data") \
4036 range(0, SIZE_MAX) \
4037 \
4038 product(uintx, SharedSymbolTableBucketSize, 4, \
4039 "Average number of symbols per bucket in shared table") \
4040 range(2, 246) \
4041 \
4042 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4043 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4044 "classes. Just exclude them from the shared dictionary.") \
4045 \
4046 diagnostic(bool, PrintMethodHandleStubs, false, \
4047 "Print generated stub code for method handles") \
4048 \
4049 develop(bool, TraceMethodHandles, false, \
4050 "trace internal method handle operations") \
4051 \
4052 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4053 "perform extra checks when constructing method handles") \
4054 \
4055 diagnostic(bool, ShowHiddenFrames, false, \
4056 "show method handle implementation frames (usually hidden)") \
4057 \
4058 experimental(bool, TrustFinalNonStaticFields, false, \
4059 "trust final non-static declarations for constant folding") \
4060 \
4061 diagnostic(bool, FoldStableValues, true, \
4062 "Optimize loads from stable fields (marked w/ @Stable)") \
4063 \
4064 develop(bool, TraceInvokeDynamic, false, \
4065 "trace internal invoke dynamic operations") \
4066 \
4067 diagnostic(bool, PauseAtStartup, false, \
4068 "Causes the VM to pause at startup time and wait for the pause " \
4069 "file to be removed (default: ./vm.paused.<pid>)") \
4070 \
4071 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4072 "The file to create and for whose removal to await when pausing " \
4073 "at startup. (default: ./vm.paused.<pid>)") \
4074 \
4075 diagnostic(bool, PauseAtExit, false, \
4076 "Pause and wait for keypress on exit if a debugger is attached") \
4077 \
4078 product(bool, ExtendedDTraceProbes, false, \
4079 "Enable performance-impacting dtrace probes") \
4080 \
4081 product(bool, DTraceMethodProbes, false, \
4082 "Enable dtrace probes for method-entry and method-exit") \
4083 \
4084 product(bool, DTraceAllocProbes, false, \
4085 "Enable dtrace probes for object allocation") \
4086 \
4087 product(bool, DTraceMonitorProbes, false, \
4088 "Enable dtrace probes for monitor events") \
4089 \
4090 product(bool, RelaxAccessControlCheck, false, \
4091 "Relax the access control checks in the verifier") \
4092 \
4093 product(uintx, StringTableSize, defaultStringTableSize, \
4094 "Number of buckets in the interned String table") \
4095 range(minimumStringTableSize, 111*defaultStringTableSize) \
4096 \
4097 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4098 "Number of buckets in the JVM internal Symbol table") \
4099 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4100 \
4101 product(bool, UseStringDeduplication, false, \
4102 "Use string deduplication") \
4103 \
4104 product(uintx, StringDeduplicationAgeThreshold, 3, \
4105 "A string must reach this age (or be promoted to an old region) " \
4106 "to be considered for deduplication") \
4107 range(1, markOopDesc::max_age) \
4108 \
4109 diagnostic(bool, StringDeduplicationResizeALot, false, \
4110 "Force table resize every time the table is scanned") \
4111 \
4112 diagnostic(bool, StringDeduplicationRehashALot, false, \
4113 "Force table rehash every time the table is scanned") \
4114 \
4115 diagnostic(bool, WhiteBoxAPI, false, \
4116 "Enable internal testing APIs") \
4117 \
4118 experimental(intx, SurvivorAlignmentInBytes, 0, \
4119 "Default survivor space alignment in bytes") \
4120 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4121 \
4122 product(bool , AllowNonVirtualCalls, false, \
4123 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4124 \
4125 product(ccstr, DumpLoadedClassList, NULL, \
4126 "Dump the names all loaded classes, that could be stored into " \
4127 "the CDS archive, in the specified file") \
4128 \
4129 product(ccstr, SharedClassListFile, NULL, \
4130 "Override the default CDS class list") \
4131 \
4132 diagnostic(ccstr, SharedArchiveFile, NULL, \
4133 "Override the default location of the CDS archive file") \
4134 \
4135 product(ccstr, ExtraSharedClassListFile, NULL, \
4136 "Extra classlist for building the CDS archive file") \
4137 \
4138 experimental(size_t, ArrayAllocatorMallocLimit, \
4139 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4140 "Allocation less than this value will be allocated " \
4141 "using malloc. Larger allocations will use mmap.") \
4142 \
4143 experimental(bool, AlwaysAtomicAccesses, false, \
4144 "Accesses to all variables should always be atomic") \
4145 \
4146 product(bool, EnableExtraSuper, true, \
4147 "allow trait interfaces to be injected into array types") \
4148 \
4149 product(bool, EnableTracing, false, \
4150 "Enable event-based tracing") \
4151 \
4152 product(bool, UseLockedTracing, false, \
4153 "Use locked-tracing when doing event-based tracing") \
4154 \
4155 diagnostic(bool, UseUnalignedAccesses, false, \
4156 "Use unaligned memory accesses in Unsafe") \
4157 \
4158 product_pd(bool, PreserveFramePointer, \
4159 "Use the FP register for holding the frame pointer " \
4160 "and not as a general purpose register.") \
4161 \
4162 diagnostic(bool, CheckIntrinsics, true, \
4163 "When a class C is loaded, check that " \
4164 "(1) all intrinsics defined by the VM for class C are present "\
4165 "in the loaded class file and are marked with the " \
4166 "@HotSpotIntrinsicCandidate annotation, that " \
4167 "(2) there is an intrinsic registered for all loaded methods " \
4168 "that are annotated with the @HotSpotIntrinsicCandidate " \
4169 "annotation, and that " \
4170 "(3) no orphan methods exist for class C (i.e., methods for " \
4171 "which the VM declares an intrinsic but that are not declared "\
4172 "in the loaded class C. " \
4173 "Check (3) is available only in debug builds.") \
4174 \
4175 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4176 "Disable backwards compatibility for compile commands.") \
4177 \
4178 diagnostic(bool, CompilerDirectivesPrint, false, \
4179 "Print compiler directives on installation.") \
4180 diagnostic(int, CompilerDirectivesLimit, 50, \
4181 "Limit on number of compiler directives.") \
4182 \
4183 experimental(bool, ValueTypePassFieldsAsArgs, true, \
4184 "Pass each field as an argument at calls") \
4185
4186 /*
4187 * Macros for factoring of globals
4188 */
4189
4190 // Interface macros
4191 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4192 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4193 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4194 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4195 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4196 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4197 #ifdef PRODUCT
4198 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4199 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4200 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4201 #else
4202 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4203 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4204 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4205 #endif // PRODUCT
4206 // Special LP64 flags, product only needed for now.
4207 #ifdef _LP64
4208 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4209 #else
4210 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4211 #endif // _LP64
4212
4213 // Implementation macros
4214 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4215 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4216 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4217 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4218 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4219 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4220 #ifdef PRODUCT
4221 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4222 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4223 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4224 #else
4225 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4226 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4227 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4228 #endif // PRODUCT
4229 #ifdef _LP64
4230 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4231 #else
4232 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4233 #endif // _LP64
4234
4235 // Only materialize src code for range checking when required, ignore otherwise
4236 #define IGNORE_RANGE(a, b)
4237 // Only materialize src code for contraint checking when required, ignore otherwise
4238 #define IGNORE_CONSTRAINT(func,type)
4239
4240 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4241 DECLARE_PD_DEVELOPER_FLAG, \
4242 DECLARE_PRODUCT_FLAG, \
4243 DECLARE_PD_PRODUCT_FLAG, \
4244 DECLARE_DIAGNOSTIC_FLAG, \
4245 DECLARE_EXPERIMENTAL_FLAG, \
4246 DECLARE_NOTPRODUCT_FLAG, \
4247 DECLARE_MANAGEABLE_FLAG, \
4248 DECLARE_PRODUCT_RW_FLAG, \
4249 DECLARE_LP64_PRODUCT_FLAG, \
4250 IGNORE_RANGE, \
4251 IGNORE_CONSTRAINT)
4252
4253 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4254 DECLARE_PD_DEVELOPER_FLAG, \
4255 DECLARE_PRODUCT_FLAG, \
4256 DECLARE_PD_PRODUCT_FLAG, \
4257 DECLARE_DIAGNOSTIC_FLAG, \
4258 DECLARE_NOTPRODUCT_FLAG, \
4259 IGNORE_RANGE, \
4260 IGNORE_CONSTRAINT)
4261
4262 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4263 DECLARE_PRODUCT_FLAG, \
4264 DECLARE_DIAGNOSTIC_FLAG, \
4265 DECLARE_EXPERIMENTAL_FLAG, \
4266 DECLARE_NOTPRODUCT_FLAG, \
4267 IGNORE_RANGE, \
4268 IGNORE_CONSTRAINT)
4269
4270 // Extensions
4271
4272 #include "runtime/globals_ext.hpp"
4273
4274 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP