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