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 // function type that will construct default range string
228 typedef const char* (*RangeStrFunc)(void);
229
230 struct Flag {
231 enum Flags {
232 // value origin
233 DEFAULT = 0,
234 COMMAND_LINE = 1,
235 ENVIRON_VAR = 2,
236 CONFIG_FILE = 3,
237 MANAGEMENT = 4,
238 ERGONOMIC = 5,
239 ATTACH_ON_DEMAND = 6,
240 INTERNAL = 7,
241
242 LAST_VALUE_ORIGIN = INTERNAL,
243 VALUE_ORIGIN_BITS = 4,
244 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
245
246 // flag kind
247 KIND_PRODUCT = 1 << 4,
248 KIND_MANAGEABLE = 1 << 5,
249 KIND_DIAGNOSTIC = 1 << 6,
250 KIND_EXPERIMENTAL = 1 << 7,
251 KIND_NOT_PRODUCT = 1 << 8,
252 KIND_DEVELOP = 1 << 9,
253 KIND_PLATFORM_DEPENDENT = 1 << 10,
254 KIND_READ_WRITE = 1 << 11,
255 KIND_C1 = 1 << 12,
256 KIND_C2 = 1 << 13,
257 KIND_ARCH = 1 << 14,
258 KIND_SHARK = 1 << 15,
259 KIND_LP64_PRODUCT = 1 << 16,
260 KIND_COMMERCIAL = 1 << 17,
261 KIND_JVMCI = 1 << 18,
262
263 KIND_MASK = ~VALUE_ORIGIN_MASK
264 };
265
266 enum Error {
267 // no error
268 SUCCESS = 0,
269 // flag name is missing
270 MISSING_NAME,
271 // flag value is missing
272 MISSING_VALUE,
273 // error parsing the textual form of the value
274 WRONG_FORMAT,
275 // flag is not writeable
276 NON_WRITABLE,
277 // flag value is outside of its bounds
278 OUT_OF_BOUNDS,
279 // flag value violates its constraint
280 VIOLATES_CONSTRAINT,
281 // there is no flag with the given name
282 INVALID_FLAG,
283 // other, unspecified error related to setting the flag
284 ERR_OTHER
285 };
286
287 enum MsgType {
288 NONE = 0,
289 DIAGNOSTIC_FLAG_BUT_LOCKED,
290 EXPERIMENTAL_FLAG_BUT_LOCKED,
291 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
292 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
293 };
294
295 const char* _type;
296 const char* _name;
297 void* _addr;
298 NOT_PRODUCT(const char* _doc;)
299 Flags _flags;
300
301 // points to all Flags static array
302 static Flag* flags;
303
304 // number of flags
305 static size_t numFlags;
306
307 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
308 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
309 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
310
311 static const char* get_int_default_range_str();
312 static const char* get_uint_default_range_str();
313 static const char* get_intx_default_range_str();
314 static const char* get_uintx_default_range_str();
315 static const char* get_uint64_t_default_range_str();
316 static const char* get_size_t_default_range_str();
317 static const char* get_double_default_range_str();
318
319 void check_writable();
320
321 bool is_bool() const;
322 bool get_bool() const;
323 void set_bool(bool value);
324
325 bool is_int() const;
326 int get_int() const;
327 void set_int(int value);
328
329 bool is_uint() const;
330 uint get_uint() const;
331 void set_uint(uint value);
332
333 bool is_intx() const;
334 intx get_intx() const;
335 void set_intx(intx value);
336
337 bool is_uintx() const;
338 uintx get_uintx() const;
339 void set_uintx(uintx value);
340
341 bool is_uint64_t() const;
342 uint64_t get_uint64_t() const;
343 void set_uint64_t(uint64_t value);
344
345 bool is_size_t() const;
346 size_t get_size_t() const;
347 void set_size_t(size_t value);
348
349 bool is_double() const;
350 double get_double() const;
351 void set_double(double value);
352
353 bool is_ccstr() const;
354 bool ccstr_accumulates() const;
355 ccstr get_ccstr() const;
356 void set_ccstr(ccstr value);
357
358 Flags get_origin();
359 void set_origin(Flags origin);
360
361 bool is_default();
362 bool is_ergonomic();
363 bool is_command_line();
364
365 bool is_product() const;
366 bool is_manageable() const;
367 bool is_diagnostic() const;
368 bool is_experimental() const;
369 bool is_notproduct() const;
370 bool is_develop() const;
371 bool is_read_write() const;
372 bool is_commercial() const;
373
374 bool is_constant_in_binary() const;
375
376 bool is_unlocker() const;
377 bool is_unlocked() const;
378 bool is_writeable() const;
379 bool is_external() const;
380
381 bool is_unlocker_ext() const;
382 bool is_unlocked_ext() const;
383 bool is_writeable_ext() const;
384 bool is_external_ext() const;
385
386 void unlock_diagnostic();
387
388 Flag::MsgType get_locked_message(char*, int) const;
389 void get_locked_message_ext(char*, int) const;
390
391 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
392 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
393 void print_kind(outputStream* st);
394 void print_as_flag(outputStream* st);
395
396 static const char* flag_error_str(Flag::Error error);
397 };
398
399 // debug flags control various aspects of the VM and are global accessible
400
401 // use FlagSetting to temporarily change some debug flag
402 // e.g. FlagSetting fs(DebugThisAndThat, true);
403 // restored to previous value upon leaving scope
404 class FlagSetting {
405 bool val;
406 bool* flag;
407 public:
408 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
409 ~FlagSetting() { *flag = val; }
410 };
411
412
413 class CounterSetting {
414 intx* counter;
415 public:
416 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
417 ~CounterSetting() { (*counter)--; }
418 };
419
420 class IntFlagSetting {
421 int val;
422 int* flag;
423 public:
424 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
425 ~IntFlagSetting() { *flag = val; }
426 };
427
428 class UIntFlagSetting {
429 uint val;
430 uint* flag;
431 public:
432 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
433 ~UIntFlagSetting() { *flag = val; }
434 };
435
436 class UIntXFlagSetting {
437 uintx val;
438 uintx* flag;
439 public:
440 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
441 ~UIntXFlagSetting() { *flag = val; }
442 };
443
444 class DoubleFlagSetting {
445 double val;
446 double* flag;
447 public:
448 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
449 ~DoubleFlagSetting() { *flag = val; }
450 };
451
452 class SizeTFlagSetting {
453 size_t val;
454 size_t* flag;
455 public:
456 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
457 ~SizeTFlagSetting() { *flag = val; }
458 };
459
460
461 class CommandLineFlags {
462 public:
463 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
464 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); }
465 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
466 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
467 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
468
469 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
470 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); }
471 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
472 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
473 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
474
475 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
476 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); }
477 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
478 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
479 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
480
481 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
482 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); }
483 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
484 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
485 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
486
487 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
488 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); }
489 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
490 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
491 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
492
493 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
494 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); }
495 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
496 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
497 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
498
499 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
500 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); }
501 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
502 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
503 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
504
505 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
506 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); }
507 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
508 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
509 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
510
511 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
512 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); }
513 // Contract: Flag will make private copy of the incoming value.
514 // Outgoing value is always malloc-ed, and caller MUST call free.
515 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
516 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
517
518 // Returns false if name is not a command line flag.
519 static bool wasSetOnCmdline(const char* name, bool* value);
520 static void printSetFlags(outputStream* out);
521
522 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
523 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
524
525 static void verify() PRODUCT_RETURN;
526 };
527
528 // use this for flags that are true by default in the debug version but
529 // false in the optimized version, and vice versa
530 #ifdef ASSERT
531 #define trueInDebug true
532 #define falseInDebug false
533 #else
534 #define trueInDebug false
535 #define falseInDebug true
536 #endif
537
538 // use this for flags that are true per default in the product build
539 // but false in development builds, and vice versa
540 #ifdef PRODUCT
541 #define trueInProduct true
542 #define falseInProduct false
543 #else
544 #define trueInProduct false
545 #define falseInProduct true
546 #endif
547
548 #ifdef JAVASE_EMBEDDED
549 #define falseInEmbedded false
550 #else
551 #define falseInEmbedded true
552 #endif
553
554 // develop flags are settable / visible only during development and are constant in the PRODUCT version
555 // product flags are always settable / visible
556 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
557
558 // A flag must be declared with one of the following types:
559 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
560 // The type "ccstr" is an alias for "const char*" and is used
561 // only in this file, because the macrology requires single-token type names.
562
563 // Note: Diagnostic options not meant for VM tuning or for product modes.
564 // They are to be used for VM quality assurance or field diagnosis
565 // of VM bugs. They are hidden so that users will not be encouraged to
566 // try them as if they were VM ordinary execution options. However, they
567 // are available in the product version of the VM. Under instruction
568 // from support engineers, VM customers can turn them on to collect
569 // diagnostic information about VM problems. To use a VM diagnostic
570 // option, you must first specify +UnlockDiagnosticVMOptions.
571 // (This master switch also affects the behavior of -Xprintflags.)
572 //
573 // experimental flags are in support of features that are not
574 // part of the officially supported product, but are available
575 // for experimenting with. They could, for example, be performance
576 // features that may not have undergone full or rigorous QA, but which may
577 // help performance in some cases and released for experimentation
578 // by the community of users and developers. This flag also allows one to
579 // be able to build a fully supported product that nonetheless also
580 // ships with some unsupported, lightly tested, experimental features.
581 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
582 // UnlockExperimentalVMOptions flag, which allows the control and
583 // modification of the experimental flags.
584 //
585 // Nota bene: neither diagnostic nor experimental options should be used casually,
586 // and they are not supported on production loads, except under explicit
587 // direction from support engineers.
588 //
589 // manageable flags are writeable external product flags.
590 // They are dynamically writeable through the JDK management interface
591 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
592 // These flags are external exported interface (see CCC). The list of
593 // manageable flags can be queried programmatically through the management
594 // interface.
595 //
596 // A flag can be made as "manageable" only if
597 // - the flag is defined in a CCC as an external exported interface.
598 // - the VM implementation supports dynamic setting of the flag.
599 // This implies that the VM must *always* query the flag variable
600 // and not reuse state related to the flag state at any given time.
601 // - you want the flag to be queried programmatically by the customers.
602 //
603 // product_rw flags are writeable internal product flags.
604 // They are like "manageable" flags but for internal/private use.
605 // The list of product_rw flags are internal/private flags which
606 // may be changed/removed in a future release. It can be set
607 // through the management interface to get/set value
608 // when the name of flag is supplied.
609 //
610 // A flag can be made as "product_rw" only if
611 // - the VM implementation supports dynamic setting of the flag.
612 // This implies that the VM must *always* query the flag variable
613 // and not reuse state related to the flag state at any given time.
614 //
615 // Note that when there is a need to support develop flags to be writeable,
616 // it can be done in the same way as product_rw.
617 //
618 // range is a macro that will expand to min and max arguments for range
619 // checking code if provided - see commandLineFlagRangeList.hpp
620 //
621 // constraint is a macro that will expand to custom function call
622 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
623 //
624
625 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
626 \
627 lp64_product(bool, UseCompressedOops, false, \
628 "Use 32-bit object references in 64-bit VM. " \
629 "lp64_product means flag is always constant in 32 bit VM") \
630 \
631 lp64_product(bool, UseCompressedClassPointers, false, \
632 "Use 32-bit class pointers in 64-bit VM. " \
633 "lp64_product means flag is always constant in 32 bit VM") \
634 \
635 notproduct(bool, CheckCompressedOops, true, \
636 "Generate checks in encoding/decoding code in debug VM") \
637 \
638 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
639 "Heap allocation steps through preferred address regions to find" \
640 " where it can allocate the heap. Number of steps to take per " \
641 "region.") \
642 range(1, max_uintx) \
643 \
644 diagnostic(bool, PrintCompressedOopsMode, false, \
645 "Print compressed oops base address and encoding mode") \
646 \
647 lp64_product(intx, ObjectAlignmentInBytes, 8, \
648 "Default object alignment in bytes, 8 is minimum") \
649 range(8, 256) \
650 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
651 \
652 product(bool, AssumeMP, false, \
653 "Instruct the VM to assume multiple processors are available") \
654 \
655 /* UseMembar is theoretically a temp flag used for memory barrier */ \
656 /* removal testing. It was supposed to be removed before FCS but has */ \
657 /* been re-added (see 6401008) */ \
658 product_pd(bool, UseMembar, \
659 "(Unstable) Issues membars on thread state transitions") \
660 \
661 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
662 "Clean the chunk pool asynchronously") \
663 \
664 experimental(bool, AlwaysSafeConstructors, false, \
665 "Force safe construction, as if all fields are final.") \
666 \
667 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
668 "Enable normal processing of flags relating to field diagnostics")\
669 \
670 experimental(bool, UnlockExperimentalVMOptions, false, \
671 "Enable normal processing of flags relating to experimental " \
672 "features") \
673 \
674 product(bool, JavaMonitorsInStackTrace, true, \
675 "Print information about Java monitor locks when the stacks are" \
676 "dumped") \
677 \
678 product_pd(bool, UseLargePages, \
679 "Use large page memory") \
680 \
681 product_pd(bool, UseLargePagesIndividualAllocation, \
682 "Allocate large pages individually for better affinity") \
683 \
684 develop(bool, LargePagesIndividualAllocationInjectError, false, \
685 "Fail large pages individual allocation") \
686 \
687 product(bool, UseLargePagesInMetaspace, false, \
688 "Use large page memory in metaspace. " \
689 "Only used if UseLargePages is enabled.") \
690 \
691 develop(bool, TracePageSizes, false, \
692 "Trace page size selection and usage") \
693 \
694 product(bool, UseNUMA, false, \
695 "Use NUMA if available") \
696 \
697 product(bool, UseNUMAInterleaving, false, \
698 "Interleave memory across NUMA nodes if available") \
699 \
700 product(size_t, NUMAInterleaveGranularity, 2*M, \
701 "Granularity to use for NUMA interleaving on Windows OS") \
702 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
703 \
704 product(bool, ForceNUMA, false, \
705 "Force NUMA optimizations on single-node/UMA systems") \
706 \
707 product(uintx, NUMAChunkResizeWeight, 20, \
708 "Percentage (0-100) used to weight the current sample when " \
709 "computing exponentially decaying average for " \
710 "AdaptiveNUMAChunkSizing") \
711 range(0, 100) \
712 \
713 product(size_t, NUMASpaceResizeRate, 1*G, \
714 "Do not reallocate more than this amount per collection") \
715 range(0, max_uintx) \
716 \
717 product(bool, UseAdaptiveNUMAChunkSizing, true, \
718 "Enable adaptive chunk sizing for NUMA") \
719 \
720 product(bool, NUMAStats, false, \
721 "Print NUMA stats in detailed heap information") \
722 \
723 product(uintx, NUMAPageScanRate, 256, \
724 "Maximum number of pages to include in the page scan procedure") \
725 range(0, max_uintx) \
726 \
727 product_pd(bool, NeedsDeoptSuspend, \
728 "True for register window machines (sparc/ia64)") \
729 \
730 product(intx, UseSSE, 99, \
731 "Highest supported SSE instructions set on x86/x64") \
732 range(0, 99) \
733 \
734 product(bool, UseAES, false, \
735 "Control whether AES instructions can be used on x86/x64") \
736 \
737 product(bool, UseSHA, false, \
738 "Control whether SHA instructions can be used " \
739 "on SPARC, on ARM and on x86") \
740 \
741 product(bool, UseGHASHIntrinsics, false, \
742 "Use intrinsics for GHASH versions of crypto") \
743 \
744 product(size_t, LargePageSizeInBytes, 0, \
745 "Large page size (0 to let VM choose the page size)") \
746 range(0, max_uintx) \
747 \
748 product(size_t, LargePageHeapSizeThreshold, 128*M, \
749 "Use large pages if maximum heap is at least this big") \
750 range(0, max_uintx) \
751 \
752 product(bool, ForceTimeHighResolution, false, \
753 "Using high time resolution (for Win32 only)") \
754 \
755 develop(bool, TracePcPatching, false, \
756 "Trace usage of frame::patch_pc") \
757 \
758 develop(bool, TraceJumps, false, \
759 "Trace assembly jumps in thread ring buffer") \
760 \
761 develop(bool, TraceRelocator, false, \
762 "Trace the bytecode relocator") \
763 \
764 develop(bool, TraceLongCompiles, false, \
765 "Print out every time compilation is longer than " \
766 "a given threshold") \
767 \
768 develop(bool, SafepointALot, false, \
769 "Generate a lot of safepoints. This works with " \
770 "GuaranteedSafepointInterval") \
771 \
772 product_pd(bool, BackgroundCompilation, \
773 "A thread requesting compilation is not blocked during " \
774 "compilation") \
775 \
776 product(bool, PrintVMQWaitTime, false, \
777 "Print out the waiting time in VM operation queue") \
778 \
779 develop(bool, TraceOopMapGeneration, false, \
780 "Show OopMapGeneration") \
781 \
782 product(bool, MethodFlushing, true, \
783 "Reclamation of zombie and not-entrant methods") \
784 \
785 develop(bool, VerifyStack, false, \
786 "Verify stack of each thread when it is entering a runtime call") \
787 \
788 diagnostic(bool, ForceUnreachable, false, \
789 "Make all non code cache addresses to be unreachable by " \
790 "forcing use of 64bit literal fixups") \
791 \
792 notproduct(bool, StressDerivedPointers, false, \
793 "Force scavenge when a derived pointer is detected on stack " \
794 "after rtm call") \
795 \
796 develop(bool, TraceDerivedPointers, false, \
797 "Trace traversal of derived pointers on stack") \
798 \
799 notproduct(bool, TraceCodeBlobStacks, false, \
800 "Trace stack-walk of codeblobs") \
801 \
802 product(bool, PrintJNIResolving, false, \
803 "Used to implement -v:jni") \
804 \
805 notproduct(bool, PrintRewrites, false, \
806 "Print methods that are being rewritten") \
807 \
808 product(bool, UseInlineCaches, true, \
809 "Use Inline Caches for virtual calls ") \
810 \
811 develop(bool, InlineArrayCopy, true, \
812 "Inline arraycopy native that is known to be part of " \
813 "base library DLL") \
814 \
815 develop(bool, InlineObjectHash, true, \
816 "Inline Object::hashCode() native that is known to be part " \
817 "of base library DLL") \
818 \
819 develop(bool, InlineNatives, true, \
820 "Inline natives that are known to be part of base library DLL") \
821 \
822 develop(bool, InlineMathNatives, true, \
823 "Inline SinD, CosD, etc.") \
824 \
825 develop(bool, InlineClassNatives, true, \
826 "Inline Class.isInstance, etc") \
827 \
828 develop(bool, InlineThreadNatives, true, \
829 "Inline Thread.currentThread, etc") \
830 \
831 develop(bool, InlineUnsafeOps, true, \
832 "Inline memory ops (native methods) from Unsafe") \
833 \
834 product(bool, CriticalJNINatives, true, \
835 "Check for critical JNI entry points") \
836 \
837 notproduct(bool, StressCriticalJNINatives, false, \
838 "Exercise register saving code in critical natives") \
839 \
840 product(bool, UseAESIntrinsics, false, \
841 "Use intrinsics for AES versions of crypto") \
842 \
843 product(bool, UseAESCTRIntrinsics, false, \
844 "Use intrinsics for the paralleled version of AES/CTR crypto") \
845 \
846 product(bool, UseSHA1Intrinsics, false, \
847 "Use intrinsics for SHA-1 crypto hash function. " \
848 "Requires that UseSHA is enabled.") \
849 \
850 product(bool, UseSHA256Intrinsics, false, \
851 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
852 "Requires that UseSHA is enabled.") \
853 \
854 product(bool, UseSHA512Intrinsics, false, \
855 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
856 "Requires that UseSHA is enabled.") \
857 \
858 product(bool, UseCRC32Intrinsics, false, \
859 "use intrinsics for java.util.zip.CRC32") \
860 \
861 product(bool, UseCRC32CIntrinsics, false, \
862 "use intrinsics for java.util.zip.CRC32C") \
863 \
864 product(bool, UseAdler32Intrinsics, false, \
865 "use intrinsics for java.util.zip.Adler32") \
866 \
867 product(bool, UseVectorizedMismatchIntrinsic, false, \
868 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
869 \
870 diagnostic(ccstrlist, DisableIntrinsic, "", \
871 "do not expand intrinsics whose (internal) names appear here") \
872 \
873 develop(bool, TraceCallFixup, false, \
874 "Trace all call fixups") \
875 \
876 develop(bool, DeoptimizeALot, false, \
877 "Deoptimize at every exit from the runtime system") \
878 \
879 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
880 "A comma separated list of bcis to deoptimize at") \
881 \
882 product(bool, DeoptimizeRandom, false, \
883 "Deoptimize random frames on random exit from the runtime system")\
884 \
885 notproduct(bool, ZombieALot, false, \
886 "Create zombies (non-entrant) at exit from the runtime system") \
887 \
888 product(bool, UnlinkSymbolsALot, false, \
889 "Unlink unreferenced symbols from the symbol table at safepoints")\
890 \
891 notproduct(bool, WalkStackALot, false, \
892 "Trace stack (no print) at every exit from the runtime system") \
893 \
894 product(bool, Debugging, false, \
895 "Set when executing debug methods in debug.cpp " \
896 "(to prevent triggering assertions)") \
897 \
898 notproduct(bool, StrictSafepointChecks, trueInDebug, \
899 "Enable strict checks that safepoints cannot happen for threads " \
900 "that use NoSafepointVerifier") \
901 \
902 notproduct(bool, VerifyLastFrame, false, \
903 "Verify oops on last frame on entry to VM") \
904 \
905 product(bool, FailOverToOldVerifier, true, \
906 "Fail over to old verifier when split verifier fails") \
907 \
908 develop(bool, ShowSafepointMsgs, false, \
909 "Show message about safepoint synchronization") \
910 \
911 product(bool, SafepointTimeout, false, \
912 "Time out and warn or fail after SafepointTimeoutDelay " \
913 "milliseconds if failed to reach safepoint") \
914 \
915 develop(bool, DieOnSafepointTimeout, false, \
916 "Die upon failure to reach safepoint (see SafepointTimeout)") \
917 \
918 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
919 /* typically, at most a few retries are needed */ \
920 product(intx, SuspendRetryCount, 50, \
921 "Maximum retry count for an external suspend request") \
922 range(0, max_intx) \
923 \
924 product(intx, SuspendRetryDelay, 5, \
925 "Milliseconds to delay per retry (* current_retry_count)") \
926 range(0, max_intx) \
927 \
928 product(bool, AssertOnSuspendWaitFailure, false, \
929 "Assert/Guarantee on external suspend wait failure") \
930 \
931 product(bool, TraceSuspendWaitFailures, false, \
932 "Trace external suspend wait failures") \
933 \
934 product(bool, MaxFDLimit, true, \
935 "Bump the number of file descriptors to maximum in Solaris") \
936 \
937 diagnostic(bool, LogEvents, true, \
938 "Enable the various ring buffer event logs") \
939 \
940 diagnostic(uintx, LogEventsBufferEntries, 10, \
941 "Number of ring buffer event logs") \
942 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
943 \
944 product(bool, BytecodeVerificationRemote, true, \
945 "Enable the Java bytecode verifier for remote classes") \
946 \
947 product(bool, BytecodeVerificationLocal, false, \
948 "Enable the Java bytecode verifier for local classes") \
949 \
950 develop(bool, ForceFloatExceptions, trueInDebug, \
951 "Force exceptions on FP stack under/overflow") \
952 \
953 develop(bool, VerifyStackAtCalls, false, \
954 "Verify that the stack pointer is unchanged after calls") \
955 \
956 develop(bool, TraceJavaAssertions, false, \
957 "Trace java language assertions") \
958 \
959 notproduct(bool, CheckAssertionStatusDirectives, false, \
960 "Temporary - see javaClasses.cpp") \
961 \
962 notproduct(bool, PrintMallocFree, false, \
963 "Trace calls to C heap malloc/free allocation") \
964 \
965 notproduct(bool, VerifyCodeCache, false, \
966 "Verify code cache on memory allocation/deallocation") \
967 \
968 develop(bool, UseMallocOnly, false, \
969 "Use only malloc/free for allocation (no resource area/arena)") \
970 \
971 develop(bool, PrintMalloc, false, \
972 "Print all malloc/free calls") \
973 \
974 develop(bool, PrintMallocStatistics, false, \
975 "Print malloc/free statistics") \
976 \
977 develop(bool, ZapResourceArea, trueInDebug, \
978 "Zap freed resource/arena space with 0xABABABAB") \
979 \
980 notproduct(bool, ZapVMHandleArea, trueInDebug, \
981 "Zap freed VM handle space with 0xBCBCBCBC") \
982 \
983 develop(bool, ZapJNIHandleArea, trueInDebug, \
984 "Zap freed JNI handle space with 0xFEFEFEFE") \
985 \
986 notproduct(bool, ZapStackSegments, trueInDebug, \
987 "Zap allocated/freed stack segments with 0xFADFADED") \
988 \
989 develop(bool, ZapUnusedHeapArea, trueInDebug, \
990 "Zap unused heap space with 0xBAADBABE") \
991 \
992 develop(bool, CheckZapUnusedHeapArea, false, \
993 "Check zapping of unused heap space") \
994 \
995 develop(bool, ZapFillerObjects, trueInDebug, \
996 "Zap filler objects with 0xDEAFBABE") \
997 \
998 develop(bool, PrintVMMessages, true, \
999 "Print VM messages on console") \
1000 \
1001 notproduct(uintx, ErrorHandlerTest, 0, \
1002 "If > 0, provokes an error after VM initialization; the value " \
1003 "determines which error to provoke. See test_error_handler() " \
1004 "in debug.cpp.") \
1005 \
1006 notproduct(uintx, TestCrashInErrorHandler, 0, \
1007 "If > 0, provokes an error inside VM error handler (a secondary " \
1008 "crash). see test_error_handler() in debug.cpp.") \
1009 \
1010 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1011 "If true, tests SafeFetch inside error handler.") \
1012 \
1013 develop(bool, Verbose, false, \
1014 "Print additional debugging information from other modes") \
1015 \
1016 develop(bool, PrintMiscellaneous, false, \
1017 "Print uncategorized debugging information (requires +Verbose)") \
1018 \
1019 develop(bool, WizardMode, false, \
1020 "Print much more debugging information") \
1021 \
1022 product(bool, ShowMessageBoxOnError, false, \
1023 "Keep process alive on VM fatal error") \
1024 \
1025 product(bool, CreateCoredumpOnCrash, true, \
1026 "Create core/mini dump on VM fatal error") \
1027 \
1028 product(uint64_t, ErrorLogTimeout, 2 * 60, \
1029 "Timeout, in seconds, to limit the time spent on writing an " \
1030 "error log in case of a crash.") \
1031 range(0, (uint64_t)max_jlong/1000) \
1032 \
1033 product_pd(bool, UseOSErrorReporting, \
1034 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1035 \
1036 product(bool, SuppressFatalErrorMessage, false, \
1037 "Report NO fatal error message (avoid deadlock)") \
1038 \
1039 product(ccstrlist, OnError, "", \
1040 "Run user-defined commands on fatal error; see VMError.cpp " \
1041 "for examples") \
1042 \
1043 product(ccstrlist, OnOutOfMemoryError, "", \
1044 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1045 \
1046 manageable(bool, HeapDumpBeforeFullGC, false, \
1047 "Dump heap to file before any major stop-the-world GC") \
1048 \
1049 manageable(bool, HeapDumpAfterFullGC, false, \
1050 "Dump heap to file after any major stop-the-world GC") \
1051 \
1052 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1053 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1054 \
1055 manageable(ccstr, HeapDumpPath, NULL, \
1056 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1057 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1058 "in the working directory)") \
1059 \
1060 develop(bool, BreakAtWarning, false, \
1061 "Execute breakpoint upon encountering VM warning") \
1062 \
1063 develop(bool, UseFakeTimers, false, \
1064 "Tell whether the VM should use system time or a fake timer") \
1065 \
1066 product(ccstr, NativeMemoryTracking, "off", \
1067 "Native memory tracking options") \
1068 \
1069 diagnostic(bool, PrintNMTStatistics, false, \
1070 "Print native memory tracking summary data if it is on") \
1071 \
1072 diagnostic(bool, LogCompilation, false, \
1073 "Log compilation activity in detail to LogFile") \
1074 \
1075 product(bool, PrintCompilation, false, \
1076 "Print compilations") \
1077 \
1078 diagnostic(bool, TraceNMethodInstalls, false, \
1079 "Trace nmethod installation") \
1080 \
1081 diagnostic(intx, ScavengeRootsInCode, 2, \
1082 "0: do not allow scavengable oops in the code cache; " \
1083 "1: allow scavenging from the code cache; " \
1084 "2: emit as many constants as the compiler can see") \
1085 range(0, 2) \
1086 \
1087 product(bool, AlwaysRestoreFPU, false, \
1088 "Restore the FPU control word after every JNI call (expensive)") \
1089 \
1090 diagnostic(bool, PrintCompilation2, false, \
1091 "Print additional statistics per compilation") \
1092 \
1093 diagnostic(bool, PrintAdapterHandlers, false, \
1094 "Print code generated for i2c/c2i adapters") \
1095 \
1096 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1097 "Verify that i2c/c2i adapters are called properly") \
1098 \
1099 develop(bool, VerifyAdapterSharing, false, \
1100 "Verify that the code for shared adapters is the equivalent") \
1101 \
1102 diagnostic(bool, PrintAssembly, false, \
1103 "Print assembly code (using external disassembler.so)") \
1104 \
1105 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1106 "Print options string passed to disassembler.so") \
1107 \
1108 notproduct(bool, PrintNMethodStatistics, false, \
1109 "Print a summary statistic for the generated nmethods") \
1110 \
1111 diagnostic(bool, PrintNMethods, false, \
1112 "Print assembly code for nmethods when generated") \
1113 \
1114 diagnostic(bool, PrintNativeNMethods, false, \
1115 "Print assembly code for native nmethods when generated") \
1116 \
1117 develop(bool, PrintDebugInfo, false, \
1118 "Print debug information for all nmethods when generated") \
1119 \
1120 develop(bool, PrintRelocations, false, \
1121 "Print relocation information for all nmethods when generated") \
1122 \
1123 develop(bool, PrintDependencies, false, \
1124 "Print dependency information for all nmethods when generated") \
1125 \
1126 develop(bool, PrintExceptionHandlers, false, \
1127 "Print exception handler tables for all nmethods when generated") \
1128 \
1129 develop(bool, StressCompiledExceptionHandlers, false, \
1130 "Exercise compiled exception handlers") \
1131 \
1132 develop(bool, InterceptOSException, false, \
1133 "Start debugger when an implicit OS (e.g. NULL) " \
1134 "exception happens") \
1135 \
1136 product(bool, PrintCodeCache, false, \
1137 "Print the code cache memory usage when exiting") \
1138 \
1139 develop(bool, PrintCodeCache2, false, \
1140 "Print detailed usage information on the code cache when exiting")\
1141 \
1142 product(bool, PrintCodeCacheOnCompilation, false, \
1143 "Print the code cache memory usage each time a method is " \
1144 "compiled") \
1145 \
1146 diagnostic(bool, PrintStubCode, false, \
1147 "Print generated stub code") \
1148 \
1149 product(bool, StackTraceInThrowable, true, \
1150 "Collect backtrace in throwable when exception happens") \
1151 \
1152 product(bool, OmitStackTraceInFastThrow, true, \
1153 "Omit backtraces for some 'hot' exceptions in optimized code") \
1154 \
1155 product(bool, ProfilerPrintByteCodeStatistics, false, \
1156 "Print bytecode statistics when dumping profiler output") \
1157 \
1158 product(bool, ProfilerRecordPC, false, \
1159 "Collect ticks for each 16 byte interval of compiled code") \
1160 \
1161 product(bool, ProfileVM, false, \
1162 "Profile ticks that fall within VM (either in the VM Thread " \
1163 "or VM code called through stubs)") \
1164 \
1165 product(bool, ProfileIntervals, false, \
1166 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1167 \
1168 notproduct(bool, ProfilerCheckIntervals, false, \
1169 "Collect and print information on spacing of profiler ticks") \
1170 \
1171 product(bool, PrintWarnings, true, \
1172 "Print JVM warnings to output stream") \
1173 \
1174 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1175 "Print warnings for stalled SpinLocks") \
1176 \
1177 product(bool, RegisterFinalizersAtInit, true, \
1178 "Register finalizable objects at end of Object.<init> or " \
1179 "after allocation") \
1180 \
1181 develop(bool, RegisterReferences, true, \
1182 "Tell whether the VM should register soft/weak/final/phantom " \
1183 "references") \
1184 \
1185 develop(bool, IgnoreRewrites, false, \
1186 "Suppress rewrites of bytecodes in the oopmap generator. " \
1187 "This is unsafe!") \
1188 \
1189 develop(bool, PrintCodeCacheExtension, false, \
1190 "Print extension of code cache") \
1191 \
1192 develop(bool, UsePrivilegedStack, true, \
1193 "Enable the security JVM functions") \
1194 \
1195 develop(bool, ProtectionDomainVerification, true, \
1196 "Verify protection domain before resolution in system dictionary")\
1197 \
1198 product(bool, ClassUnloading, true, \
1199 "Do unloading of classes") \
1200 \
1201 product(bool, ClassUnloadingWithConcurrentMark, true, \
1202 "Do unloading of classes during concurrent mark") \
1203 \
1204 develop(bool, DisableStartThread, false, \
1205 "Disable starting of additional Java threads " \
1206 "(for debugging only)") \
1207 \
1208 develop(bool, MemProfiling, false, \
1209 "Write memory usage profiling to log file") \
1210 \
1211 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1212 "Print the system dictionary at exit") \
1213 \
1214 experimental(intx, PredictedLoadedClassCount, 0, \
1215 "Experimental: Tune loaded class cache starting size") \
1216 \
1217 diagnostic(bool, UnsyncloadClass, false, \
1218 "Unstable: VM calls loadClass unsynchronized. Custom " \
1219 "class loader must call VM synchronized for findClass " \
1220 "and defineClass.") \
1221 \
1222 product(bool, AlwaysLockClassLoader, false, \
1223 "Require the VM to acquire the class loader lock before calling " \
1224 "loadClass() even for class loaders registering " \
1225 "as parallel capable") \
1226 \
1227 product(bool, AllowParallelDefineClass, false, \
1228 "Allow parallel defineClass requests for class loaders " \
1229 "registering as parallel capable") \
1230 \
1231 product(bool, MustCallLoadClassInternal, false, \
1232 "Call loadClassInternal() rather than loadClass()") \
1233 \
1234 product_pd(bool, DontYieldALot, \
1235 "Throw away obvious excess yield calls") \
1236 \
1237 product(bool, ConvertSleepToYield, true, \
1238 "Convert sleep(0) to thread yield ") \
1239 \
1240 product(bool, ConvertYieldToSleep, false, \
1241 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1242 "behavior") \
1243 \
1244 develop(bool, UseDetachedThreads, true, \
1245 "Use detached threads that are recycled upon termination " \
1246 "(for Solaris only)") \
1247 \
1248 product(bool, UseLWPSynchronization, true, \
1249 "Use LWP-based instead of libthread-based synchronization " \
1250 "(SPARC only)") \
1251 \
1252 experimental(ccstr, SyncKnobs, NULL, \
1253 "(Unstable) Various monitor synchronization tunables") \
1254 \
1255 experimental(intx, EmitSync, 0, \
1256 "(Unsafe, Unstable) " \
1257 "Control emission of inline sync fast-path code") \
1258 \
1259 product(intx, MonitorBound, 0, "Bound Monitor population") \
1260 range(0, max_jint) \
1261 \
1262 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1263 \
1264 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1265 "Experimental Sync flags") \
1266 \
1267 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1268 \
1269 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1270 \
1271 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1272 \
1273 experimental(intx, hashCode, 5, \
1274 "(Unstable) select hashCode generation algorithm") \
1275 \
1276 product(bool, FilterSpuriousWakeups, true, \
1277 "When true prevents OS-level spurious, or premature, wakeups " \
1278 "from Object.wait (Ignored for Windows)") \
1279 \
1280 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1281 \
1282 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1283 \
1284 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1285 \
1286 develop(bool, UsePthreads, false, \
1287 "Use pthread-based instead of libthread-based synchronization " \
1288 "(SPARC only)") \
1289 \
1290 product(bool, ReduceSignalUsage, false, \
1291 "Reduce the use of OS signals in Java and/or the VM") \
1292 \
1293 develop_pd(bool, ShareVtableStubs, \
1294 "Share vtable stubs (smaller code but worse branch prediction") \
1295 \
1296 develop(bool, LoadLineNumberTables, true, \
1297 "Tell whether the class file parser loads line number tables") \
1298 \
1299 develop(bool, LoadLocalVariableTables, true, \
1300 "Tell whether the class file parser loads local variable tables") \
1301 \
1302 develop(bool, LoadLocalVariableTypeTables, true, \
1303 "Tell whether the class file parser loads local variable type" \
1304 "tables") \
1305 \
1306 product(bool, AllowUserSignalHandlers, false, \
1307 "Do not complain if the application installs signal handlers " \
1308 "(Solaris & Linux only)") \
1309 \
1310 product(bool, UseSignalChaining, true, \
1311 "Use signal-chaining to invoke signal handlers installed " \
1312 "by the application (Solaris & Linux only)") \
1313 \
1314 product(bool, AllowJNIEnvProxy, false, \
1315 "Allow JNIEnv proxies for jdbx") \
1316 \
1317 product(bool, RestoreMXCSROnJNICalls, false, \
1318 "Restore MXCSR when returning from JNI calls") \
1319 \
1320 product(bool, CheckJNICalls, false, \
1321 "Verify all arguments to JNI calls") \
1322 \
1323 product(bool, CheckEndorsedAndExtDirs, false, \
1324 "Verify the endorsed and extension directories are not used") \
1325 \
1326 product(bool, UseFastJNIAccessors, true, \
1327 "Use optimized versions of Get<Primitive>Field") \
1328 \
1329 product(intx, MaxJNILocalCapacity, 65536, \
1330 "Maximum allowable local JNI handle capacity to " \
1331 "EnsureLocalCapacity() and PushLocalFrame(), " \
1332 "where <= 0 is unlimited, default: 65536") \
1333 range(min_intx, max_intx) \
1334 \
1335 product(bool, EagerXrunInit, false, \
1336 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1337 "but not all -Xrun libraries may support the state of the VM " \
1338 "at this time") \
1339 \
1340 product(bool, PreserveAllAnnotations, false, \
1341 "Preserve RuntimeInvisibleAnnotations as well " \
1342 "as RuntimeVisibleAnnotations") \
1343 \
1344 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1345 "Number of OutOfMemoryErrors preallocated with backtrace") \
1346 \
1347 product(bool, UseXMMForArrayCopy, false, \
1348 "Use SSE2 MOVQ instruction for Arraycopy") \
1349 \
1350 product(intx, FieldsAllocationStyle, 1, \
1351 "0 - type based with oops first, " \
1352 "1 - with oops last, " \
1353 "2 - oops in super and sub classes are together") \
1354 range(0, 2) \
1355 \
1356 product(bool, CompactFields, true, \
1357 "Allocate nonstatic fields in gaps between previous fields") \
1358 \
1359 notproduct(bool, PrintFieldLayout, false, \
1360 "Print field layout for each class") \
1361 \
1362 /* Need to limit the extent of the padding to reasonable size. */\
1363 /* 8K is well beyond the reasonable HW cache line size, even with */\
1364 /* aggressive prefetching, while still leaving the room for segregating */\
1365 /* among the distinct pages. */\
1366 product(intx, ContendedPaddingWidth, 128, \
1367 "How many bytes to pad the fields/classes marked @Contended with")\
1368 range(0, 8192) \
1369 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1370 \
1371 product(bool, EnableContended, true, \
1372 "Enable @Contended annotation support") \
1373 \
1374 product(bool, RestrictContended, true, \
1375 "Restrict @Contended to trusted classes") \
1376 \
1377 product(bool, UseBiasedLocking, true, \
1378 "Enable biased locking in JVM") \
1379 \
1380 product(intx, BiasedLockingStartupDelay, 4000, \
1381 "Number of milliseconds to wait before enabling biased locking") \
1382 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1383 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1384 \
1385 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1386 "Print statistics of biased locking in JVM") \
1387 \
1388 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1389 "Threshold of number of revocations per type to try to " \
1390 "rebias all objects in the heap of that type") \
1391 range(0, max_intx) \
1392 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1393 \
1394 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1395 "Threshold of number of revocations per type to permanently " \
1396 "revoke biases of all objects in the heap of that type") \
1397 range(0, max_intx) \
1398 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1399 \
1400 product(intx, BiasedLockingDecayTime, 25000, \
1401 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1402 "type after previous bulk rebias") \
1403 range(500, max_intx) \
1404 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1405 \
1406 product(bool, ExitOnOutOfMemoryError, false, \
1407 "JVM exits on the first occurrence of an out-of-memory error") \
1408 \
1409 product(bool, CrashOnOutOfMemoryError, false, \
1410 "JVM aborts, producing an error log and core/mini dump, on the " \
1411 "first occurrence of an out-of-memory error") \
1412 \
1413 /* tracing */ \
1414 \
1415 develop(bool, StressRewriter, false, \
1416 "Stress linktime bytecode rewriting") \
1417 \
1418 product(ccstr, TraceJVMTI, NULL, \
1419 "Trace flags for JVMTI functions and events") \
1420 \
1421 /* This option can change an EMCP method into an obsolete method. */ \
1422 /* This can affect tests that except specific methods to be EMCP. */ \
1423 /* This option should be used with caution. */ \
1424 product(bool, StressLdcRewrite, false, \
1425 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1426 \
1427 product(uintx, TraceRedefineClasses, 0, \
1428 "Trace level for JVMTI RedefineClasses") \
1429 range(0, 0xFFFFFFFF) \
1430 \
1431 /* change to false by default sometime after Mustang */ \
1432 product(bool, VerifyMergedCPBytecodes, true, \
1433 "Verify bytecodes after RedefineClasses constant pool merging") \
1434 \
1435 develop(bool, TraceBytecodes, false, \
1436 "Trace bytecode execution") \
1437 \
1438 develop(bool, TraceICs, false, \
1439 "Trace inline cache changes") \
1440 \
1441 notproduct(bool, TraceInvocationCounterOverflow, false, \
1442 "Trace method invocation counter overflow") \
1443 \
1444 develop(bool, TraceInlineCacheClearing, false, \
1445 "Trace clearing of inline caches in nmethods") \
1446 \
1447 develop(bool, TraceDependencies, false, \
1448 "Trace dependencies") \
1449 \
1450 develop(bool, VerifyDependencies, trueInDebug, \
1451 "Exercise and verify the compilation dependency mechanism") \
1452 \
1453 develop(bool, TraceNewOopMapGeneration, false, \
1454 "Trace OopMapGeneration") \
1455 \
1456 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1457 "Trace OopMapGeneration: print detailed cell states") \
1458 \
1459 develop(bool, TimeOopMap, false, \
1460 "Time calls to GenerateOopMap::compute_map() in sum") \
1461 \
1462 develop(bool, TimeOopMap2, false, \
1463 "Time calls to GenerateOopMap::compute_map() individually") \
1464 \
1465 develop(bool, TraceOopMapRewrites, false, \
1466 "Trace rewriting of method oops during oop map generation") \
1467 \
1468 develop(bool, TraceICBuffer, false, \
1469 "Trace usage of IC buffer") \
1470 \
1471 develop(bool, TraceCompiledIC, false, \
1472 "Trace changes of compiled IC") \
1473 \
1474 /* gc */ \
1475 \
1476 product(bool, UseSerialGC, false, \
1477 "Use the Serial garbage collector") \
1478 \
1479 product(bool, UseG1GC, false, \
1480 "Use the Garbage-First garbage collector") \
1481 \
1482 product(bool, UseParallelGC, false, \
1483 "Use the Parallel Scavenge garbage collector") \
1484 \
1485 product(bool, UseParallelOldGC, false, \
1486 "Use the Parallel Old garbage collector") \
1487 \
1488 product(uintx, HeapMaximumCompactionInterval, 20, \
1489 "How often should we maximally compact the heap (not allowing " \
1490 "any dead space)") \
1491 range(0, max_uintx) \
1492 \
1493 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1494 "The collection count for the first maximum compaction") \
1495 range(0, max_uintx) \
1496 \
1497 product(bool, UseMaximumCompactionOnSystemGC, true, \
1498 "Use maximum compaction in the Parallel Old garbage collector " \
1499 "for a system GC") \
1500 \
1501 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1502 "The mean used by the parallel compact dead wood " \
1503 "limiter (a number between 0-100)") \
1504 range(0, 100) \
1505 \
1506 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1507 "The standard deviation used by the parallel compact dead wood " \
1508 "limiter (a number between 0-100)") \
1509 range(0, 100) \
1510 \
1511 product(uint, ParallelGCThreads, 0, \
1512 "Number of parallel threads parallel gc will use") \
1513 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1514 \
1515 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1516 "Use semaphore synchronization for the GC Threads, " \
1517 "instead of synchronization based on mutexes") \
1518 \
1519 product(bool, UseDynamicNumberOfGCThreads, false, \
1520 "Dynamically choose the number of parallel threads " \
1521 "parallel gc will use") \
1522 \
1523 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1524 "Force dynamic selection of the number of " \
1525 "parallel threads parallel gc will use to aid debugging") \
1526 \
1527 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1528 "Size of heap (bytes) per GC thread used in calculating the " \
1529 "number of GC threads") \
1530 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1531 \
1532 product(uint, ConcGCThreads, 0, \
1533 "Number of threads concurrent gc will use") \
1534 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1535 \
1536 product(uintx, GCTaskTimeStampEntries, 200, \
1537 "Number of time stamp entries per gc worker thread") \
1538 range(1, max_uintx) \
1539 \
1540 product(bool, AlwaysTenure, false, \
1541 "Always tenure objects in eden (ParallelGC only)") \
1542 \
1543 product(bool, NeverTenure, false, \
1544 "Never tenure objects in eden, may tenure on overflow " \
1545 "(ParallelGC only)") \
1546 \
1547 product(bool, ScavengeBeforeFullGC, true, \
1548 "Scavenge youngest generation before each full GC.") \
1549 \
1550 product(bool, UseConcMarkSweepGC, false, \
1551 "Use Concurrent Mark-Sweep GC in the old generation") \
1552 \
1553 product(bool, ExplicitGCInvokesConcurrent, false, \
1554 "A System.gc() request invokes a concurrent collection; " \
1555 "(effective only when using concurrent collectors)") \
1556 \
1557 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1558 "A System.gc() request invokes a concurrent collection and " \
1559 "also unloads classes during such a concurrent gc cycle " \
1560 "(effective only when UseConcMarkSweepGC)") \
1561 \
1562 product(bool, GCLockerInvokesConcurrent, false, \
1563 "The exit of a JNI critical section necessitating a scavenge, " \
1564 "also kicks off a background concurrent collection") \
1565 \
1566 product(uintx, GCLockerEdenExpansionPercent, 5, \
1567 "How much the GC can expand the eden by while the GC locker " \
1568 "is active (as a percentage)") \
1569 range(0, 100) \
1570 \
1571 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1572 "Number of times to retry allocations when " \
1573 "blocked by the GC locker") \
1574 range(0, max_uintx) \
1575 \
1576 product(bool, UseCMSBestFit, true, \
1577 "Use CMS best fit allocation strategy") \
1578 \
1579 product(bool, UseParNewGC, false, \
1580 "Use parallel threads in the new generation") \
1581 \
1582 product(uintx, ParallelGCBufferWastePct, 10, \
1583 "Wasted fraction of parallel allocation buffer") \
1584 range(0, 100) \
1585 \
1586 product(uintx, TargetPLABWastePct, 10, \
1587 "Target wasted space in last buffer as percent of overall " \
1588 "allocation") \
1589 range(1, 100) \
1590 \
1591 product(uintx, PLABWeight, 75, \
1592 "Percentage (0-100) used to weight the current sample when " \
1593 "computing exponentially decaying average for ResizePLAB") \
1594 range(0, 100) \
1595 \
1596 product(bool, ResizePLAB, true, \
1597 "Dynamically resize (survivor space) promotion LAB's") \
1598 \
1599 product(int, ParGCArrayScanChunk, 50, \
1600 "Scan a subset of object array and push remainder, if array is " \
1601 "bigger than this") \
1602 range(1, max_jint/3) \
1603 \
1604 product(bool, ParGCUseLocalOverflow, false, \
1605 "Instead of a global overflow list, use local overflow stacks") \
1606 \
1607 product(bool, ParGCTrimOverflow, true, \
1608 "Eagerly trim the local overflow lists " \
1609 "(when ParGCUseLocalOverflow)") \
1610 \
1611 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1612 "Simulate work queue overflow in ParNew") \
1613 \
1614 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1615 "An `interval' counter that determines how frequently " \
1616 "we simulate overflow; a smaller number increases frequency") \
1617 \
1618 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1619 "The desired number of objects to claim from the overflow list") \
1620 range(0, max_uintx) \
1621 \
1622 diagnostic(uintx, ParGCStridesPerThread, 2, \
1623 "The number of strides per worker thread that we divide up the " \
1624 "card table scanning work into") \
1625 range(1, max_uintx) \
1626 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1627 \
1628 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1629 "The number of cards in each chunk of the parallel chunks used " \
1630 "during card table scanning") \
1631 range(1, max_intx) \
1632 \
1633 product(uintx, OldPLABWeight, 50, \
1634 "Percentage (0-100) used to weight the current sample when " \
1635 "computing exponentially decaying average for resizing " \
1636 "OldPLABSize") \
1637 range(0, 100) \
1638 \
1639 product(bool, ResizeOldPLAB, true, \
1640 "Dynamically resize (old gen) promotion LAB's") \
1641 \
1642 product(size_t, CMSOldPLABMax, 1024, \
1643 "Maximum size of CMS gen promotion LAB caches per worker " \
1644 "per block size") \
1645 range(1, max_uintx) \
1646 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1647 \
1648 product(size_t, CMSOldPLABMin, 16, \
1649 "Minimum size of CMS gen promotion LAB caches per worker " \
1650 "per block size") \
1651 range(1, max_uintx) \
1652 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1653 \
1654 product(uintx, CMSOldPLABNumRefills, 4, \
1655 "Nominal number of refills of CMS gen promotion LAB cache " \
1656 "per worker per block size") \
1657 range(1, max_uintx) \
1658 \
1659 product(bool, CMSOldPLABResizeQuicker, false, \
1660 "React on-the-fly during a scavenge to a sudden " \
1661 "change in block demand rate") \
1662 \
1663 product(uintx, CMSOldPLABToleranceFactor, 4, \
1664 "The tolerance of the phase-change detector for on-the-fly " \
1665 "PLAB resizing during a scavenge") \
1666 range(1, max_uintx) \
1667 \
1668 product(uintx, CMSOldPLABReactivityFactor, 2, \
1669 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1670 "during a scavenge") \
1671 range(1, max_uintx) \
1672 \
1673 product(bool, AlwaysPreTouch, false, \
1674 "Force all freshly committed pages to be pre-touched") \
1675 \
1676 product_pd(size_t, CMSYoungGenPerWorker, \
1677 "The maximum size of young gen chosen by default per GC worker " \
1678 "thread available") \
1679 range(1, max_uintx) \
1680 \
1681 product(uintx, CMSIncrementalSafetyFactor, 10, \
1682 "Percentage (0-100) used to add conservatism when computing the " \
1683 "duty cycle") \
1684 range(0, 100) \
1685 \
1686 product(uintx, CMSExpAvgFactor, 50, \
1687 "Percentage (0-100) used to weight the current sample when " \
1688 "computing exponential averages for CMS statistics") \
1689 range(0, 100) \
1690 \
1691 product(uintx, CMS_FLSWeight, 75, \
1692 "Percentage (0-100) used to weight the current sample when " \
1693 "computing exponentially decaying averages for CMS FLS " \
1694 "statistics") \
1695 range(0, 100) \
1696 \
1697 product(uintx, CMS_FLSPadding, 1, \
1698 "The multiple of deviation from mean to use for buffering " \
1699 "against volatility in free list demand") \
1700 range(0, max_juint) \
1701 \
1702 product(uintx, FLSCoalescePolicy, 2, \
1703 "CMS: aggressiveness level for coalescing, increasing " \
1704 "from 0 to 4") \
1705 range(0, 4) \
1706 \
1707 product(bool, FLSAlwaysCoalesceLarge, false, \
1708 "CMS: larger free blocks are always available for coalescing") \
1709 \
1710 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1711 "CMS: the smaller the percentage the greater the coalescing " \
1712 "force") \
1713 range(0.0, 1.0) \
1714 \
1715 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1716 "CMS: the factor by which to inflate estimated demand of small " \
1717 "block sizes to prevent coalescing with an adjoining block") \
1718 range(0.0, DBL_MAX) \
1719 \
1720 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1721 "CMS: the factor by which to inflate estimated demand of large " \
1722 "block sizes to prevent coalescing with an adjoining block") \
1723 range(0.0, DBL_MAX) \
1724 \
1725 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1726 "CMS: the factor by which to inflate estimated demand of small " \
1727 "block sizes to prevent splitting to supply demand for smaller " \
1728 "blocks") \
1729 range(0.0, DBL_MAX) \
1730 \
1731 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1732 "CMS: the factor by which to inflate estimated demand of large " \
1733 "block sizes to prevent splitting to supply demand for smaller " \
1734 "blocks") \
1735 range(0.0, DBL_MAX) \
1736 \
1737 product(bool, CMSExtrapolateSweep, false, \
1738 "CMS: cushion for block demand during sweep") \
1739 \
1740 product(uintx, CMS_SweepWeight, 75, \
1741 "Percentage (0-100) used to weight the current sample when " \
1742 "computing exponentially decaying average for inter-sweep " \
1743 "duration") \
1744 range(0, 100) \
1745 \
1746 product(uintx, CMS_SweepPadding, 1, \
1747 "The multiple of deviation from mean to use for buffering " \
1748 "against volatility in inter-sweep duration") \
1749 range(0, max_juint) \
1750 \
1751 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1752 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1753 "duration exceeds this threshold in milliseconds") \
1754 range(0, max_uintx) \
1755 \
1756 product(bool, CMSClassUnloadingEnabled, true, \
1757 "Whether class unloading enabled when using CMS GC") \
1758 \
1759 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1760 "When CMS class unloading is enabled, the maximum CMS cycle " \
1761 "count for which classes may not be unloaded") \
1762 range(0, max_uintx) \
1763 \
1764 product(uintx, CMSIndexedFreeListReplenish, 4, \
1765 "Replenish an indexed free list with this number of chunks") \
1766 range(1, max_uintx) \
1767 \
1768 product(bool, CMSReplenishIntermediate, true, \
1769 "Replenish all intermediate free-list caches") \
1770 \
1771 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1772 "When satisfying batched demand, split blocks from the " \
1773 "IndexedFreeList whose size is a multiple of requested size") \
1774 \
1775 product(bool, CMSLoopWarn, false, \
1776 "Warn in case of excessive CMS looping") \
1777 \
1778 /* where does the range max value of (max_jint - 1) come from? */ \
1779 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1780 "Maximum size of marking stack") \
1781 range(1, (max_jint - 1)) \
1782 \
1783 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1784 "Size of marking stack") \
1785 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1786 \
1787 notproduct(bool, CMSMarkStackOverflowALot, false, \
1788 "Simulate frequent marking stack / work queue overflow") \
1789 \
1790 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1791 "An \"interval\" counter that determines how frequently " \
1792 "to simulate overflow; a smaller number increases frequency") \
1793 \
1794 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1795 "Maximum number of abortable preclean iterations, if > 0") \
1796 range(0, max_uintx) \
1797 \
1798 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1799 "Maximum time in abortable preclean (in milliseconds)") \
1800 range(0, max_intx) \
1801 \
1802 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1803 "Nominal minimum work per abortable preclean iteration") \
1804 range(0, max_uintx) \
1805 \
1806 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1807 "Time that we sleep between iterations when not given " \
1808 "enough work per iteration") \
1809 range(0, max_intx) \
1810 \
1811 product(size_t, CMSRescanMultiple, 32, \
1812 "Size (in cards) of CMS parallel rescan task") \
1813 range(1, max_uintx) \
1814 \
1815 product(size_t, CMSConcMarkMultiple, 32, \
1816 "Size (in cards) of CMS concurrent MT marking task") \
1817 range(1, max_uintx) \
1818 \
1819 product(bool, CMSAbortSemantics, false, \
1820 "Whether abort-on-overflow semantics is implemented") \
1821 \
1822 product(bool, CMSParallelInitialMarkEnabled, true, \
1823 "Use the parallel initial mark.") \
1824 \
1825 product(bool, CMSParallelRemarkEnabled, true, \
1826 "Whether parallel remark enabled (only if ParNewGC)") \
1827 \
1828 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1829 "Whether parallel remark of survivor space " \
1830 "enabled (effective only if CMSParallelRemarkEnabled)") \
1831 \
1832 product(bool, CMSPLABRecordAlways, true, \
1833 "Always record survivor space PLAB boundaries (effective only " \
1834 "if CMSParallelSurvivorRemarkEnabled)") \
1835 \
1836 product(bool, CMSEdenChunksRecordAlways, true, \
1837 "Always record eden chunks used for the parallel initial mark " \
1838 "or remark of eden") \
1839 \
1840 product(bool, CMSConcurrentMTEnabled, true, \
1841 "Whether multi-threaded concurrent work enabled " \
1842 "(effective only if ParNewGC)") \
1843 \
1844 product(bool, CMSPrecleaningEnabled, true, \
1845 "Whether concurrent precleaning enabled") \
1846 \
1847 product(uintx, CMSPrecleanIter, 3, \
1848 "Maximum number of precleaning iteration passes") \
1849 range(0, 9) \
1850 \
1851 product(uintx, CMSPrecleanDenominator, 3, \
1852 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1853 "ratio") \
1854 range(1, max_uintx) \
1855 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1856 \
1857 product(uintx, CMSPrecleanNumerator, 2, \
1858 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1859 "ratio") \
1860 range(0, max_uintx-1) \
1861 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1862 \
1863 product(bool, CMSPrecleanRefLists1, true, \
1864 "Preclean ref lists during (initial) preclean phase") \
1865 \
1866 product(bool, CMSPrecleanRefLists2, false, \
1867 "Preclean ref lists during abortable preclean phase") \
1868 \
1869 product(bool, CMSPrecleanSurvivors1, false, \
1870 "Preclean survivors during (initial) preclean phase") \
1871 \
1872 product(bool, CMSPrecleanSurvivors2, true, \
1873 "Preclean survivors during abortable preclean phase") \
1874 \
1875 product(uintx, CMSPrecleanThreshold, 1000, \
1876 "Do not iterate again if number of dirty cards is less than this")\
1877 range(100, max_uintx) \
1878 \
1879 product(bool, CMSCleanOnEnter, true, \
1880 "Clean-on-enter optimization for reducing number of dirty cards") \
1881 \
1882 product(uintx, CMSRemarkVerifyVariant, 1, \
1883 "Choose variant (1,2) of verification following remark") \
1884 range(1, 2) \
1885 \
1886 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1887 "If Eden size is below this, do not try to schedule remark") \
1888 range(0, max_uintx) \
1889 \
1890 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1891 "The Eden occupancy percentage (0-100) at which " \
1892 "to try and schedule remark pause") \
1893 range(0, 100) \
1894 \
1895 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1896 "Start sampling eden top at least before young gen " \
1897 "occupancy reaches 1/<ratio> of the size at which " \
1898 "we plan to schedule remark") \
1899 range(1, max_uintx) \
1900 \
1901 product(uintx, CMSSamplingGrain, 16*K, \
1902 "The minimum distance between eden samples for CMS (see above)") \
1903 range(ObjectAlignmentInBytes, max_uintx) \
1904 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \
1905 \
1906 product(bool, CMSScavengeBeforeRemark, false, \
1907 "Attempt scavenge before the CMS remark step") \
1908 \
1909 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1910 "Don't drain below this size per parallel worker/thief") \
1911 range(1, max_juint) \
1912 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1913 \
1914 manageable(intx, CMSWaitDuration, 2000, \
1915 "Time in milliseconds that CMS thread waits for young GC") \
1916 range(min_jint, max_jint) \
1917 \
1918 develop(uintx, CMSCheckInterval, 1000, \
1919 "Interval in milliseconds that CMS thread checks if it " \
1920 "should start a collection cycle") \
1921 \
1922 product(bool, CMSYield, true, \
1923 "Yield between steps of CMS") \
1924 \
1925 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1926 "Bitmap operations should process at most this many bits " \
1927 "between yields") \
1928 range(1, max_uintx) \
1929 \
1930 product(bool, CMSPrintChunksInDump, false, \
1931 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1932 "trace level include more detailed information about the" \
1933 "free chunks") \
1934 \
1935 product(bool, CMSPrintObjectsInDump, false, \
1936 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1937 "trace level include more detailed information about the" \
1938 "allocated objects") \
1939 \
1940 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1941 "Verify that all references across the FLS boundary " \
1942 "are to valid objects") \
1943 \
1944 diagnostic(bool, FLSVerifyLists, false, \
1945 "Do lots of (expensive) FreeListSpace verification") \
1946 \
1947 diagnostic(bool, FLSVerifyIndexTable, false, \
1948 "Do lots of (expensive) FLS index table verification") \
1949 \
1950 develop(bool, FLSVerifyDictionary, false, \
1951 "Do lots of (expensive) FLS dictionary verification") \
1952 \
1953 develop(bool, VerifyBlockOffsetArray, false, \
1954 "Do (expensive) block offset array verification") \
1955 \
1956 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1957 "Maintain _unallocated_block in BlockOffsetArray " \
1958 "(currently applicable only to CMS collector)") \
1959 \
1960 product(intx, RefDiscoveryPolicy, 0, \
1961 "Select type of reference discovery policy: " \
1962 "reference-based(0) or referent-based(1)") \
1963 range(ReferenceProcessor::DiscoveryPolicyMin, \
1964 ReferenceProcessor::DiscoveryPolicyMax) \
1965 \
1966 product(bool, ParallelRefProcEnabled, false, \
1967 "Enable parallel reference processing whenever possible") \
1968 \
1969 product(bool, ParallelRefProcBalancingEnabled, true, \
1970 "Enable balancing of reference processing queues") \
1971 \
1972 product(uintx, CMSTriggerRatio, 80, \
1973 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1974 "allocated before a CMS collection cycle commences") \
1975 range(0, 100) \
1976 \
1977 product(uintx, CMSBootstrapOccupancy, 50, \
1978 "Percentage CMS generation occupancy at which to " \
1979 "initiate CMS collection for bootstrapping collection stats") \
1980 range(0, 100) \
1981 \
1982 product(intx, CMSInitiatingOccupancyFraction, -1, \
1983 "Percentage CMS generation occupancy to start a CMS collection " \
1984 "cycle. A negative value means that CMSTriggerRatio is used") \
1985 range(min_intx, 100) \
1986 \
1987 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1988 "The percent occupancy (IHOP) of the current old generation " \
1989 "capacity above which a concurrent mark cycle will be initiated " \
1990 "Its value may change over time if adaptive IHOP is enabled, " \
1991 "otherwise the value remains constant. " \
1992 "In the latter case a value of 0 will result as frequent as " \
1993 "possible concurrent marking cycles. A value of 100 disables " \
1994 "concurrent marking. " \
1995 "Fragmentation waste in the old generation is not considered " \
1996 "free space in this calculation. (G1 collector only)") \
1997 range(0, 100) \
1998 \
1999 manageable(intx, CMSTriggerInterval, -1, \
2000 "Commence a CMS collection cycle (at least) every so many " \
2001 "milliseconds (0 permanently, -1 disabled)") \
2002 range(-1, max_intx) \
2003 \
2004 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2005 "Only use occupancy as a criterion for starting a CMS collection")\
2006 \
2007 product(uintx, CMSIsTooFullPercentage, 98, \
2008 "An absolute ceiling above which CMS will always consider the " \
2009 "unloading of classes when class unloading is enabled") \
2010 range(0, 100) \
2011 \
2012 develop(bool, CMSTestInFreeList, false, \
2013 "Check if the coalesced range is already in the " \
2014 "free lists as claimed") \
2015 \
2016 notproduct(bool, CMSVerifyReturnedBytes, false, \
2017 "Check that all the garbage collected was returned to the " \
2018 "free lists") \
2019 \
2020 notproduct(bool, ScavengeALot, false, \
2021 "Force scavenge at every Nth exit from the runtime system " \
2022 "(N=ScavengeALotInterval)") \
2023 \
2024 develop(bool, FullGCALot, false, \
2025 "Force full gc at every Nth exit from the runtime system " \
2026 "(N=FullGCALotInterval)") \
2027 \
2028 notproduct(bool, GCALotAtAllSafepoints, false, \
2029 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2030 \
2031 notproduct(bool, PromotionFailureALot, false, \
2032 "Use promotion failure handling on every youngest generation " \
2033 "collection") \
2034 \
2035 develop(uintx, PromotionFailureALotCount, 1000, \
2036 "Number of promotion failures occurring at PLAB " \
2037 "refill attempts (ParNew) or promotion attempts " \
2038 "(other young collectors)") \
2039 \
2040 develop(uintx, PromotionFailureALotInterval, 5, \
2041 "Total collections between promotion failures a lot") \
2042 \
2043 experimental(uintx, WorkStealingSleepMillis, 1, \
2044 "Sleep time when sleep is used for yields") \
2045 \
2046 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2047 "Number of yields before a sleep is done during work stealing") \
2048 \
2049 experimental(uintx, WorkStealingHardSpins, 4096, \
2050 "Number of iterations in a spin loop between checks on " \
2051 "time out of hard spin") \
2052 \
2053 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2054 "Ratio of hard spins to calls to yield") \
2055 \
2056 develop(uintx, ObjArrayMarkingStride, 512, \
2057 "Number of object array elements to push onto the marking stack " \
2058 "before pushing a continuation entry") \
2059 \
2060 develop(bool, MetadataAllocationFailALot, false, \
2061 "Fail metadata allocations at intervals controlled by " \
2062 "MetadataAllocationFailALotInterval") \
2063 \
2064 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2065 "Metadata allocation failure a lot interval") \
2066 \
2067 notproduct(bool, ExecuteInternalVMTests, false, \
2068 "Enable execution of internal VM tests") \
2069 \
2070 notproduct(bool, VerboseInternalVMTests, false, \
2071 "Turn on logging for internal VM tests.") \
2072 \
2073 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2074 \
2075 product_pd(bool, ResizeTLAB, \
2076 "Dynamically resize TLAB size for threads") \
2077 \
2078 product(bool, ZeroTLAB, false, \
2079 "Zero out the newly created TLAB") \
2080 \
2081 product(bool, FastTLABRefill, true, \
2082 "Use fast TLAB refill code") \
2083 \
2084 product(bool, TLABStats, true, \
2085 "Provide more detailed and expensive TLAB statistics.") \
2086 \
2087 product_pd(bool, NeverActAsServerClassMachine, \
2088 "Never act like a server-class machine") \
2089 \
2090 product(bool, AlwaysActAsServerClassMachine, false, \
2091 "Always act like a server-class machine") \
2092 \
2093 product_pd(uint64_t, MaxRAM, \
2094 "Real memory size (in bytes) used to set maximum heap size") \
2095 range(0, 0XFFFFFFFFFFFFFFFF) \
2096 \
2097 product(size_t, ErgoHeapSizeLimit, 0, \
2098 "Maximum ergonomically set heap size (in bytes); zero means use " \
2099 "MaxRAM / MaxRAMFraction") \
2100 range(0, max_uintx) \
2101 \
2102 product(uintx, MaxRAMFraction, 4, \
2103 "Maximum fraction (1/n) of real memory used for maximum heap " \
2104 "size") \
2105 range(1, max_uintx) \
2106 \
2107 product(uintx, MinRAMFraction, 2, \
2108 "Minimum fraction (1/n) of real memory used for maximum heap " \
2109 "size on systems with small physical memory size") \
2110 range(1, max_uintx) \
2111 \
2112 product(uintx, InitialRAMFraction, 64, \
2113 "Fraction (1/n) of real memory used for initial heap size") \
2114 range(1, max_uintx) \
2115 \
2116 develop(uintx, MaxVirtMemFraction, 2, \
2117 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2118 "determining maximum heap size") \
2119 \
2120 product(bool, UseAutoGCSelectPolicy, false, \
2121 "Use automatic collection selection policy") \
2122 \
2123 product(uintx, AutoGCSelectPauseMillis, 5000, \
2124 "Automatic GC selection pause threshold in milliseconds") \
2125 range(0, max_uintx) \
2126 \
2127 product(bool, UseAdaptiveSizePolicy, true, \
2128 "Use adaptive generation sizing policies") \
2129 \
2130 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2131 "Use adaptive survivor sizing policies") \
2132 \
2133 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2134 "Use adaptive young-old sizing policies at minor collections") \
2135 \
2136 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2137 "Use adaptive young-old sizing policies at major collections") \
2138 \
2139 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2140 "Include statistics from System.gc() for adaptive size policy") \
2141 \
2142 product(bool, UseAdaptiveGCBoundary, false, \
2143 "Allow young-old boundary to move") \
2144 \
2145 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2146 "Resize the virtual spaces of the young or old generations") \
2147 range(-1, 1) \
2148 \
2149 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2150 "Policy for changing generation size for throughput goals") \
2151 range(0, 1) \
2152 \
2153 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2154 "Number of steps where heuristics is used before data is used") \
2155 range(0, max_uintx) \
2156 \
2157 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2158 "Number of collections before the adaptive sizing is started") \
2159 \
2160 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2161 "Collection interval for printing information; zero means never") \
2162 range(0, max_uintx) \
2163 \
2164 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2165 "Use adaptive minimum footprint as a goal") \
2166 \
2167 product(uintx, AdaptiveSizePolicyWeight, 10, \
2168 "Weight given to exponential resizing, between 0 and 100") \
2169 range(0, 100) \
2170 \
2171 product(uintx, AdaptiveTimeWeight, 25, \
2172 "Weight given to time in adaptive policy, between 0 and 100") \
2173 range(0, 100) \
2174 \
2175 product(uintx, PausePadding, 1, \
2176 "How much buffer to keep for pause time") \
2177 range(0, max_juint) \
2178 \
2179 product(uintx, PromotedPadding, 3, \
2180 "How much buffer to keep for promotion failure") \
2181 range(0, max_juint) \
2182 \
2183 product(uintx, SurvivorPadding, 3, \
2184 "How much buffer to keep for survivor overflow") \
2185 range(0, max_juint) \
2186 \
2187 product(uintx, ThresholdTolerance, 10, \
2188 "Allowed collection cost difference between generations") \
2189 range(0, 100) \
2190 \
2191 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2192 "If collection costs are within margin, reduce both by full " \
2193 "delta") \
2194 range(0, 100) \
2195 \
2196 product(uintx, YoungGenerationSizeIncrement, 20, \
2197 "Adaptive size percentage change in young generation") \
2198 range(0, 100) \
2199 \
2200 product(uintx, YoungGenerationSizeSupplement, 80, \
2201 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2202 range(0, 100) \
2203 \
2204 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2205 "Decay factor to YoungedGenerationSizeSupplement") \
2206 range(1, max_uintx) \
2207 \
2208 product(uintx, TenuredGenerationSizeIncrement, 20, \
2209 "Adaptive size percentage change in tenured generation") \
2210 range(0, 100) \
2211 \
2212 product(uintx, TenuredGenerationSizeSupplement, 80, \
2213 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2214 range(0, 100) \
2215 \
2216 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2217 "Decay factor to TenuredGenerationSizeIncrement") \
2218 range(1, max_uintx) \
2219 \
2220 product(uintx, MaxGCPauseMillis, max_uintx - 1, \
2221 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2222 "or (G1 Only) the maximum GC time per MMU time slice") \
2223 range(1, max_uintx - 1) \
2224 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \
2225 \
2226 product(uintx, GCPauseIntervalMillis, 0, \
2227 "Time slice for MMU specification") \
2228 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \
2229 \
2230 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2231 "Adaptive size policy maximum GC minor pause time goal " \
2232 "in millisecond") \
2233 range(0, max_uintx) \
2234 \
2235 product(uintx, GCTimeRatio, 99, \
2236 "Adaptive size policy application time to GC time ratio") \
2237 range(0, max_juint) \
2238 \
2239 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2240 "Adaptive size scale down factor for shrinking") \
2241 range(1, max_uintx) \
2242 \
2243 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2244 "Adaptive size decays the major cost for long major intervals") \
2245 \
2246 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2247 "Time scale over which major costs decay") \
2248 range(0, max_uintx) \
2249 \
2250 product(uintx, MinSurvivorRatio, 3, \
2251 "Minimum ratio of young generation/survivor space size") \
2252 range(3, max_uintx) \
2253 \
2254 product(uintx, InitialSurvivorRatio, 8, \
2255 "Initial ratio of young generation/survivor space size") \
2256 range(0, max_uintx) \
2257 \
2258 product(size_t, BaseFootPrintEstimate, 256*M, \
2259 "Estimate of footprint other than Java Heap") \
2260 range(0, max_uintx) \
2261 \
2262 product(bool, UseGCOverheadLimit, true, \
2263 "Use policy to limit of proportion of time spent in GC " \
2264 "before an OutOfMemory error is thrown") \
2265 \
2266 product(uintx, GCTimeLimit, 98, \
2267 "Limit of the proportion of time spent in GC before " \
2268 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2269 range(0, 100) \
2270 \
2271 product(uintx, GCHeapFreeLimit, 2, \
2272 "Minimum percentage of free space after a full GC before an " \
2273 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2274 range(0, 100) \
2275 \
2276 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2277 "Number of consecutive collections before gc time limit fires") \
2278 range(1, max_uintx) \
2279 \
2280 product(intx, PrefetchCopyIntervalInBytes, -1, \
2281 "How far ahead to prefetch destination area (<= 0 means off)") \
2282 range(-1, max_jint) \
2283 \
2284 product(intx, PrefetchScanIntervalInBytes, -1, \
2285 "How far ahead to prefetch scan area (<= 0 means off)") \
2286 range(-1, max_jint) \
2287 \
2288 product(intx, PrefetchFieldsAhead, -1, \
2289 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2290 range(-1, max_jint) \
2291 \
2292 diagnostic(bool, VerifyDuringStartup, false, \
2293 "Verify memory system before executing any Java code " \
2294 "during VM initialization") \
2295 \
2296 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2297 "Verify system before exiting") \
2298 \
2299 diagnostic(bool, VerifyBeforeGC, false, \
2300 "Verify memory system before GC") \
2301 \
2302 diagnostic(bool, VerifyAfterGC, false, \
2303 "Verify memory system after GC") \
2304 \
2305 diagnostic(bool, VerifyDuringGC, false, \
2306 "Verify memory system during GC (between phases)") \
2307 \
2308 diagnostic(ccstrlist, VerifySubSet, "", \
2309 "Memory sub-systems to verify when Verify*GC flag(s) " \
2310 "are enabled. One or more sub-systems can be specified " \
2311 "in a comma separated string. Sub-systems are: " \
2312 "threads, heap, symbol_table, string_table, codecache, " \
2313 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2314 "c-heap, codecache_oops") \
2315 \
2316 diagnostic(bool, GCParallelVerificationEnabled, true, \
2317 "Enable parallel memory system verification") \
2318 \
2319 diagnostic(bool, DeferInitialCardMark, false, \
2320 "When +ReduceInitialCardMarks, explicitly defer any that " \
2321 "may arise from new_pre_store_barrier") \
2322 \
2323 product(bool, UseCondCardMark, false, \
2324 "Check for already marked card before updating card table") \
2325 \
2326 diagnostic(bool, VerifyRememberedSets, false, \
2327 "Verify GC remembered sets") \
2328 \
2329 diagnostic(bool, VerifyObjectStartArray, true, \
2330 "Verify GC object start array if verify before/after") \
2331 \
2332 product(bool, DisableExplicitGC, false, \
2333 "Ignore calls to System.gc()") \
2334 \
2335 notproduct(bool, CheckMemoryInitialization, false, \
2336 "Check memory initialization") \
2337 \
2338 diagnostic(bool, BindCMSThreadToCPU, false, \
2339 "Bind CMS Thread to CPU if possible") \
2340 \
2341 diagnostic(uintx, CPUForCMSThread, 0, \
2342 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2343 range(0, max_juint) \
2344 \
2345 product(bool, BindGCTaskThreadsToCPUs, false, \
2346 "Bind GCTaskThreads to CPUs if possible") \
2347 \
2348 product(bool, UseGCTaskAffinity, false, \
2349 "Use worker affinity when asking for GCTasks") \
2350 \
2351 product(uintx, ProcessDistributionStride, 4, \
2352 "Stride through processors when distributing processes") \
2353 range(0, max_juint) \
2354 \
2355 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2356 "Number of times the coordinator GC thread will sleep while " \
2357 "yielding before giving up and resuming GC") \
2358 range(0, max_juint) \
2359 \
2360 product(uintx, CMSYieldSleepCount, 0, \
2361 "Number of times a GC thread (minus the coordinator) " \
2362 "will sleep while yielding before giving up and resuming GC") \
2363 range(0, max_juint) \
2364 \
2365 product(bool, PrintGC, false, \
2366 "Print message at garbage collection. " \
2367 "Deprecated, use -Xlog:gc instead.") \
2368 \
2369 product(bool, PrintGCDetails, false, \
2370 "Print more details at garbage collection. " \
2371 "Deprecated, use -Xlog:gc* instead.") \
2372 \
2373 develop(intx, ConcGCYieldTimeout, 0, \
2374 "If non-zero, assert that GC threads yield within this " \
2375 "number of milliseconds") \
2376 range(0, max_intx) \
2377 \
2378 develop(bool, TraceFinalizerRegistration, false, \
2379 "Trace registration of final references") \
2380 \
2381 notproduct(bool, TraceScavenge, false, \
2382 "Trace scavenge") \
2383 \
2384 product(bool, IgnoreEmptyClassPaths, false, \
2385 "Ignore empty path elements in -classpath") \
2386 \
2387 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2388 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2389 "Initial size of the boot class loader data metaspace") \
2390 range(30*K, max_uintx/BytesPerWord) \
2391 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2392 \
2393 product(bool, TraceYoungGenTime, false, \
2394 "Trace accumulated time for young collection") \
2395 \
2396 product(bool, TraceOldGenTime, false, \
2397 "Trace accumulated time for old collection") \
2398 \
2399 product(bool, PrintHeapAtSIGBREAK, true, \
2400 "Print heap layout in response to SIGBREAK") \
2401 \
2402 manageable(bool, PrintClassHistogram, false, \
2403 "Print a histogram of class instances") \
2404 \
2405 develop(bool, TraceWorkGang, false, \
2406 "Trace activities of work gangs") \
2407 \
2408 develop(bool, TraceGCTaskManager, false, \
2409 "Trace actions of the GC task manager") \
2410 \
2411 develop(bool, TraceGCTaskQueue, false, \
2412 "Trace actions of the GC task queues") \
2413 \
2414 diagnostic(bool, TraceGCTaskThread, false, \
2415 "Trace actions of the GC task threads") \
2416 \
2417 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2418 "Trace marking phase in ParallelOldGC") \
2419 \
2420 develop(bool, TraceParallelOldGCDensePrefix, false, \
2421 "Trace dense prefix computation for ParallelOldGC") \
2422 \
2423 develop(bool, IgnoreLibthreadGPFault, false, \
2424 "Suppress workaround for libthread GP fault") \
2425 \
2426 experimental(double, ObjectCountCutOffPercent, 0.5, \
2427 "The percentage of the used heap that the instances of a class " \
2428 "must occupy for the class to generate a trace event") \
2429 range(0.0, 100.0) \
2430 \
2431 /* JVMTI heap profiling */ \
2432 \
2433 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2434 "Trace JVMTI object tagging calls") \
2435 \
2436 diagnostic(bool, VerifyBeforeIteration, false, \
2437 "Verify memory system before JVMTI iteration") \
2438 \
2439 /* compiler interface */ \
2440 \
2441 develop(bool, CIPrintCompilerName, false, \
2442 "when CIPrint is active, print the name of the active compiler") \
2443 \
2444 diagnostic(bool, CIPrintCompileQueue, false, \
2445 "display the contents of the compile queue whenever a " \
2446 "compilation is enqueued") \
2447 \
2448 develop(bool, CIPrintRequests, false, \
2449 "display every request for compilation") \
2450 \
2451 product(bool, CITime, false, \
2452 "collect timing information for compilation") \
2453 \
2454 develop(bool, CITimeVerbose, false, \
2455 "be more verbose in compilation timings") \
2456 \
2457 develop(bool, CITimeEach, false, \
2458 "display timing information after each successful compilation") \
2459 \
2460 develop(bool, CICountOSR, false, \
2461 "use a separate counter when assigning ids to osr compilations") \
2462 \
2463 develop(bool, CICompileNatives, true, \
2464 "compile native methods if supported by the compiler") \
2465 \
2466 develop_pd(bool, CICompileOSR, \
2467 "compile on stack replacement methods if supported by the " \
2468 "compiler") \
2469 \
2470 develop(bool, CIPrintMethodCodes, false, \
2471 "print method bytecodes of the compiled code") \
2472 \
2473 develop(bool, CIPrintTypeFlow, false, \
2474 "print the results of ciTypeFlow analysis") \
2475 \
2476 develop(bool, CITraceTypeFlow, false, \
2477 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2478 \
2479 develop(intx, OSROnlyBCI, -1, \
2480 "OSR only at this bci. Negative values mean exclude that bci") \
2481 \
2482 /* compiler */ \
2483 \
2484 /* notice: the max range value here is max_jint, not max_intx */ \
2485 /* because of overflow issue */ \
2486 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2487 "Number of compiler threads to run") \
2488 range(0, max_jint) \
2489 constraint(CICompilerCountConstraintFunc, AtParse) \
2490 \
2491 product(intx, CompilationPolicyChoice, 0, \
2492 "which compilation policy (0-3)") \
2493 range(0, 3) \
2494 \
2495 develop(bool, UseStackBanging, true, \
2496 "use stack banging for stack overflow checks (required for " \
2497 "proper StackOverflow handling; disable only to measure cost " \
2498 "of stackbanging)") \
2499 \
2500 develop(bool, UseStrictFP, true, \
2501 "use strict fp if modifier strictfp is set") \
2502 \
2503 develop(bool, GenerateSynchronizationCode, true, \
2504 "generate locking/unlocking code for synchronized methods and " \
2505 "monitors") \
2506 \
2507 develop(bool, GenerateCompilerNullChecks, true, \
2508 "Generate explicit null checks for loads/stores/calls") \
2509 \
2510 develop(bool, GenerateRangeChecks, true, \
2511 "Generate range checks for array accesses") \
2512 \
2513 develop_pd(bool, ImplicitNullChecks, \
2514 "Generate code for implicit null checks") \
2515 \
2516 product_pd(bool, TrapBasedNullChecks, \
2517 "Generate code for null checks that uses a cmp and trap " \
2518 "instruction raising SIGTRAP. This is only used if an access to" \
2519 "null (+offset) will not raise a SIGSEGV, i.e.," \
2520 "ImplicitNullChecks don't work (PPC64).") \
2521 \
2522 product(bool, PrintSafepointStatistics, false, \
2523 "Print statistics about safepoint synchronization") \
2524 \
2525 product(intx, PrintSafepointStatisticsCount, 300, \
2526 "Total number of safepoint statistics collected " \
2527 "before printing them out") \
2528 range(1, max_intx) \
2529 \
2530 product(intx, PrintSafepointStatisticsTimeout, -1, \
2531 "Print safepoint statistics only when safepoint takes " \
2532 "more than PrintSafepointSatisticsTimeout in millis") \
2533 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2534 NOT_LP64(range(-1, max_intx)) \
2535 \
2536 product(bool, Inline, true, \
2537 "Enable inlining") \
2538 \
2539 product(bool, ClipInlining, true, \
2540 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2541 \
2542 develop(bool, UseCHA, true, \
2543 "Enable CHA") \
2544 \
2545 product(bool, UseTypeProfile, true, \
2546 "Check interpreter profile for historically monomorphic calls") \
2547 \
2548 diagnostic(bool, PrintInlining, false, \
2549 "Print inlining optimizations") \
2550 \
2551 product(bool, UsePopCountInstruction, false, \
2552 "Use population count instruction") \
2553 \
2554 develop(bool, EagerInitialization, false, \
2555 "Eagerly initialize classes if possible") \
2556 \
2557 diagnostic(bool, LogTouchedMethods, false, \
2558 "Log methods which have been ever touched in runtime") \
2559 \
2560 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2561 "Print all methods that have been ever touched in runtime") \
2562 \
2563 develop(bool, TraceMethodReplacement, false, \
2564 "Print when methods are replaced do to recompilation") \
2565 \
2566 develop(bool, PrintMethodFlushing, false, \
2567 "Print the nmethods being flushed") \
2568 \
2569 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2570 "print statistics about method flushing") \
2571 \
2572 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2573 "Number of compiled code invocations after which " \
2574 "the method is considered as hot by the flusher") \
2575 range(1, max_jint) \
2576 \
2577 diagnostic(intx, MinPassesBeforeFlush, 10, \
2578 "Minimum number of sweeper passes before an nmethod " \
2579 "can be flushed") \
2580 range(0, max_intx) \
2581 \
2582 product(bool, UseCodeAging, true, \
2583 "Insert counter to detect warm methods") \
2584 \
2585 diagnostic(bool, StressCodeAging, false, \
2586 "Start with counters compiled in") \
2587 \
2588 develop(bool, UseRelocIndex, false, \
2589 "Use an index to speed random access to relocations") \
2590 \
2591 develop(bool, StressCodeBuffers, false, \
2592 "Exercise code buffer expansion and other rare state changes") \
2593 \
2594 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2595 "Generate extra debugging information for non-safepoints in " \
2596 "nmethods") \
2597 \
2598 product(bool, PrintVMOptions, false, \
2599 "Print flags that appeared on the command line") \
2600 \
2601 product(bool, IgnoreUnrecognizedVMOptions, false, \
2602 "Ignore unrecognized VM options") \
2603 \
2604 product(bool, PrintCommandLineFlags, false, \
2605 "Print flags specified on command line or set by ergonomics") \
2606 \
2607 product(bool, PrintFlagsInitial, false, \
2608 "Print all VM flags before argument processing and exit VM") \
2609 \
2610 product(bool, PrintFlagsFinal, false, \
2611 "Print all VM flags after argument and ergonomic processing") \
2612 \
2613 notproduct(bool, PrintFlagsWithComments, false, \
2614 "Print all VM flags with default values and descriptions and " \
2615 "exit") \
2616 \
2617 product(bool, PrintFlagsRanges, false, \
2618 "Print VM flags and their ranges and exit VM") \
2619 \
2620 diagnostic(bool, SerializeVMOutput, true, \
2621 "Use a mutex to serialize output to tty and LogFile") \
2622 \
2623 diagnostic(bool, DisplayVMOutput, true, \
2624 "Display all VM output on the tty, independently of LogVMOutput") \
2625 \
2626 diagnostic(bool, LogVMOutput, false, \
2627 "Save VM output to LogFile") \
2628 \
2629 diagnostic(ccstr, LogFile, NULL, \
2630 "If LogVMOutput or LogCompilation is on, save VM output to " \
2631 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2632 \
2633 product(ccstr, ErrorFile, NULL, \
2634 "If an error occurs, save the error data to this file " \
2635 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2636 \
2637 product(bool, DisplayVMOutputToStderr, false, \
2638 "If DisplayVMOutput is true, display all VM output to stderr") \
2639 \
2640 product(bool, DisplayVMOutputToStdout, false, \
2641 "If DisplayVMOutput is true, display all VM output to stdout") \
2642 \
2643 product(bool, UseHeavyMonitors, false, \
2644 "use heavyweight instead of lightweight Java monitors") \
2645 \
2646 product(bool, PrintStringTableStatistics, false, \
2647 "print statistics about the StringTable and SymbolTable") \
2648 \
2649 diagnostic(bool, VerifyStringTableAtExit, false, \
2650 "verify StringTable contents at exit") \
2651 \
2652 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2653 "print histogram of the symbol table") \
2654 \
2655 notproduct(bool, ExitVMOnVerifyError, false, \
2656 "standard exit from VM if bytecode verify error " \
2657 "(only in debug mode)") \
2658 \
2659 diagnostic(ccstr, AbortVMOnException, NULL, \
2660 "Call fatal if this exception is thrown. Example: " \
2661 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2662 \
2663 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2664 "Call fatal if the exception pointed by AbortVMOnException " \
2665 "has this message") \
2666 \
2667 develop(bool, DebugVtables, false, \
2668 "add debugging code to vtable dispatch") \
2669 \
2670 notproduct(bool, PrintVtableStats, false, \
2671 "print vtables stats at end of run") \
2672 \
2673 develop(bool, TraceCreateZombies, false, \
2674 "trace creation of zombie nmethods") \
2675 \
2676 notproduct(bool, IgnoreLockingAssertions, false, \
2677 "disable locking assertions (for speed)") \
2678 \
2679 product(bool, RangeCheckElimination, true, \
2680 "Eliminate range checks") \
2681 \
2682 develop_pd(bool, UncommonNullCast, \
2683 "track occurrences of null in casts; adjust compiler tactics") \
2684 \
2685 develop(bool, TypeProfileCasts, true, \
2686 "treat casts like calls for purposes of type profiling") \
2687 \
2688 develop(bool, DelayCompilationDuringStartup, true, \
2689 "Delay invoking the compiler until main application class is " \
2690 "loaded") \
2691 \
2692 develop(bool, CompileTheWorld, false, \
2693 "Compile all methods in all classes in bootstrap class path " \
2694 "(stress test)") \
2695 \
2696 develop(bool, CompileTheWorldPreloadClasses, true, \
2697 "Preload all classes used by a class before start loading") \
2698 \
2699 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2700 "Force a safepoint every n compiles so sweeper can keep up") \
2701 \
2702 develop(bool, FillDelaySlots, true, \
2703 "Fill delay slots (on SPARC only)") \
2704 \
2705 develop(bool, TimeLivenessAnalysis, false, \
2706 "Time computation of bytecode liveness analysis") \
2707 \
2708 develop(bool, TraceLivenessGen, false, \
2709 "Trace the generation of liveness analysis information") \
2710 \
2711 notproduct(bool, TraceLivenessQuery, false, \
2712 "Trace queries of liveness analysis information") \
2713 \
2714 notproduct(bool, CollectIndexSetStatistics, false, \
2715 "Collect information about IndexSets") \
2716 \
2717 develop(bool, UseLoopSafepoints, true, \
2718 "Generate Safepoint nodes in every loop") \
2719 \
2720 develop(intx, FastAllocateSizeLimit, 128*K, \
2721 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2722 "Inline allocations larger than this in doublewords must go slow")\
2723 \
2724 product(bool, AggressiveOpts, false, \
2725 "Enable aggressive optimizations - see arguments.cpp") \
2726 \
2727 product_pd(bool, CompactStrings, \
2728 "Enable Strings to use single byte chars in backing store") \
2729 \
2730 product_pd(uintx, TypeProfileLevel, \
2731 "=XYZ, with Z: Type profiling of arguments at call; " \
2732 "Y: Type profiling of return value at call; " \
2733 "X: Type profiling of parameters to methods; " \
2734 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2735 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2736 \
2737 product(intx, TypeProfileArgsLimit, 2, \
2738 "max number of call arguments to consider for type profiling") \
2739 range(0, 16) \
2740 \
2741 product(intx, TypeProfileParmsLimit, 2, \
2742 "max number of incoming parameters to consider for type profiling"\
2743 ", -1 for all") \
2744 range(-1, 64) \
2745 \
2746 /* statistics */ \
2747 develop(bool, CountCompiledCalls, false, \
2748 "Count method invocations") \
2749 \
2750 notproduct(bool, CountRuntimeCalls, false, \
2751 "Count VM runtime calls") \
2752 \
2753 develop(bool, CountJNICalls, false, \
2754 "Count jni method invocations") \
2755 \
2756 notproduct(bool, CountJVMCalls, false, \
2757 "Count jvm method invocations") \
2758 \
2759 notproduct(bool, CountRemovableExceptions, false, \
2760 "Count exceptions that could be replaced by branches due to " \
2761 "inlining") \
2762 \
2763 notproduct(bool, ICMissHistogram, false, \
2764 "Produce histogram of IC misses") \
2765 \
2766 /* interpreter */ \
2767 product_pd(bool, RewriteBytecodes, \
2768 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2769 \
2770 product_pd(bool, RewriteFrequentPairs, \
2771 "Rewrite frequently used bytecode pairs into a single bytecode") \
2772 \
2773 diagnostic(bool, PrintInterpreter, false, \
2774 "Print the generated interpreter code") \
2775 \
2776 product(bool, UseInterpreter, true, \
2777 "Use interpreter for non-compiled methods") \
2778 \
2779 develop(bool, UseFastSignatureHandlers, true, \
2780 "Use fast signature handlers for native calls") \
2781 \
2782 product(bool, UseLoopCounter, true, \
2783 "Increment invocation counter on backward branch") \
2784 \
2785 product_pd(bool, UseOnStackReplacement, \
2786 "Use on stack replacement, calls runtime if invoc. counter " \
2787 "overflows in loop") \
2788 \
2789 notproduct(bool, TraceOnStackReplacement, false, \
2790 "Trace on stack replacement") \
2791 \
2792 product_pd(bool, PreferInterpreterNativeStubs, \
2793 "Use always interpreter stubs for native methods invoked via " \
2794 "interpreter") \
2795 \
2796 develop(bool, CountBytecodes, false, \
2797 "Count number of bytecodes executed") \
2798 \
2799 develop(bool, PrintBytecodeHistogram, false, \
2800 "Print histogram of the executed bytecodes") \
2801 \
2802 develop(bool, PrintBytecodePairHistogram, false, \
2803 "Print histogram of the executed bytecode pairs") \
2804 \
2805 diagnostic(bool, PrintSignatureHandlers, false, \
2806 "Print code generated for native method signature handlers") \
2807 \
2808 develop(bool, VerifyOops, false, \
2809 "Do plausibility checks for oops") \
2810 \
2811 develop(bool, CheckUnhandledOops, false, \
2812 "Check for unhandled oops in VM code") \
2813 \
2814 develop(bool, VerifyJNIFields, trueInDebug, \
2815 "Verify jfieldIDs for instance fields") \
2816 \
2817 notproduct(bool, VerifyJNIEnvThread, false, \
2818 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2819 "from JNI") \
2820 \
2821 develop(bool, VerifyFPU, false, \
2822 "Verify FPU state (check for NaN's, etc.)") \
2823 \
2824 develop(bool, VerifyThread, false, \
2825 "Watch the thread register for corruption (SPARC only)") \
2826 \
2827 develop(bool, VerifyActivationFrameSize, false, \
2828 "Verify that activation frame didn't become smaller than its " \
2829 "minimal size") \
2830 \
2831 develop(bool, TraceFrequencyInlining, false, \
2832 "Trace frequency based inlining") \
2833 \
2834 develop_pd(bool, InlineIntrinsics, \
2835 "Inline intrinsics that can be statically resolved") \
2836 \
2837 product_pd(bool, ProfileInterpreter, \
2838 "Profile at the bytecode level during interpretation") \
2839 \
2840 develop(bool, TraceProfileInterpreter, false, \
2841 "Trace profiling at the bytecode level during interpretation. " \
2842 "This outputs the profiling information collected to improve " \
2843 "jit compilation.") \
2844 \
2845 develop_pd(bool, ProfileTraps, \
2846 "Profile deoptimization traps at the bytecode level") \
2847 \
2848 product(intx, ProfileMaturityPercentage, 20, \
2849 "number of method invocations/branches (expressed as % of " \
2850 "CompileThreshold) before using the method's profile") \
2851 range(0, 100) \
2852 \
2853 diagnostic(bool, PrintMethodData, false, \
2854 "Print the results of +ProfileInterpreter at end of run") \
2855 \
2856 develop(bool, VerifyDataPointer, trueInDebug, \
2857 "Verify the method data pointer during interpreter profiling") \
2858 \
2859 develop(bool, VerifyCompiledCode, false, \
2860 "Include miscellaneous runtime verifications in nmethod code; " \
2861 "default off because it disturbs nmethod size heuristics") \
2862 \
2863 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2864 "Manually make GC thread crash then dump java stack trace; " \
2865 "Test only") \
2866 \
2867 /* compilation */ \
2868 product(bool, UseCompiler, true, \
2869 "Use Just-In-Time compilation") \
2870 \
2871 develop(bool, TraceCompilationPolicy, false, \
2872 "Trace compilation policy") \
2873 \
2874 develop(bool, TimeCompilationPolicy, false, \
2875 "Time the compilation policy") \
2876 \
2877 product(bool, UseCounterDecay, true, \
2878 "Adjust recompilation counters") \
2879 \
2880 develop(intx, CounterHalfLifeTime, 30, \
2881 "Half-life time of invocation counters (in seconds)") \
2882 \
2883 develop(intx, CounterDecayMinIntervalLength, 500, \
2884 "The minimum interval (in milliseconds) between invocation of " \
2885 "CounterDecay") \
2886 \
2887 product(bool, AlwaysCompileLoopMethods, false, \
2888 "When using recompilation, never interpret methods " \
2889 "containing loops") \
2890 \
2891 product(bool, DontCompileHugeMethods, true, \
2892 "Do not compile methods > HugeMethodLimit") \
2893 \
2894 /* Bytecode escape analysis estimation. */ \
2895 product(bool, EstimateArgEscape, true, \
2896 "Analyze bytecodes to estimate escape state of arguments") \
2897 \
2898 product(intx, BCEATraceLevel, 0, \
2899 "How much tracing to do of bytecode escape analysis estimates " \
2900 "(0-3)") \
2901 range(0, 3) \
2902 \
2903 product(intx, MaxBCEAEstimateLevel, 5, \
2904 "Maximum number of nested calls that are analyzed by BC EA") \
2905 range(0, max_jint) \
2906 \
2907 product(intx, MaxBCEAEstimateSize, 150, \
2908 "Maximum bytecode size of a method to be analyzed by BC EA") \
2909 range(0, max_jint) \
2910 \
2911 product(intx, AllocatePrefetchStyle, 1, \
2912 "0 = no prefetch, " \
2913 "1 = prefetch instructions for each allocation, " \
2914 "2 = use TLAB watermark to gate allocation prefetch, " \
2915 "3 = use BIS instruction on Sparc for allocation prefetch") \
2916 range(0, 3) \
2917 \
2918 product(intx, AllocatePrefetchDistance, -1, \
2919 "Distance to prefetch ahead of allocation pointer. " \
2920 "-1: use system-specific value (automatically determined") \
2921 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2922 \
2923 product(intx, AllocatePrefetchLines, 3, \
2924 "Number of lines to prefetch ahead of array allocation pointer") \
2925 range(1, 64) \
2926 \
2927 product(intx, AllocateInstancePrefetchLines, 1, \
2928 "Number of lines to prefetch ahead of instance allocation " \
2929 "pointer") \
2930 range(1, 64) \
2931 \
2932 product(intx, AllocatePrefetchStepSize, 16, \
2933 "Step size in bytes of sequential prefetch instructions") \
2934 range(1, 512) \
2935 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2936 \
2937 product(intx, AllocatePrefetchInstr, 0, \
2938 "Prefetch instruction to prefetch ahead of allocation pointer") \
2939 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \
2940 \
2941 /* deoptimization */ \
2942 develop(bool, TraceDeoptimization, false, \
2943 "Trace deoptimization") \
2944 \
2945 develop(bool, PrintDeoptimizationDetails, false, \
2946 "Print more information about deoptimization") \
2947 \
2948 develop(bool, DebugDeoptimization, false, \
2949 "Tracing various information while debugging deoptimization") \
2950 \
2951 product(intx, SelfDestructTimer, 0, \
2952 "Will cause VM to terminate after a given time (in minutes) " \
2953 "(0 means off)") \
2954 range(0, max_intx) \
2955 \
2956 product(intx, MaxJavaStackTraceDepth, 1024, \
2957 "The maximum number of lines in the stack trace for Java " \
2958 "exceptions (0 means all)") \
2959 range(0, max_jint/2) \
2960 \
2961 develop(bool, TraceStackWalk, false, \
2962 "Trace stack walking") \
2963 \
2964 product(bool, MemberNameInStackFrame, true, \
2965 "Use MemberName in StackFrame") \
2966 \
2967 /* notice: the max range value here is max_jint, not max_intx */ \
2968 /* because of overflow issue */ \
2969 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2970 "Guarantee a safepoint (at least) every so many milliseconds " \
2971 "(0 means none)")) \
2972 NOT_EMBEDDED(range(0, max_jint)) \
2973 \
2974 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2975 "Guarantee a safepoint (at least) every so many milliseconds " \
2976 "(0 means none)")) \
2977 EMBEDDED_ONLY(range(0, max_jint)) \
2978 \
2979 product(intx, SafepointTimeoutDelay, 10000, \
2980 "Delay in milliseconds for option SafepointTimeout") \
2981 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
2982 NOT_LP64(range(0, max_intx)) \
2983 \
2984 product(intx, NmethodSweepActivity, 10, \
2985 "Removes cold nmethods from code cache if > 0. Higher values " \
2986 "result in more aggressive sweeping") \
2987 range(0, 2000) \
2988 \
2989 notproduct(bool, LogSweeper, false, \
2990 "Keep a ring buffer of sweeper activity") \
2991 \
2992 notproduct(intx, SweeperLogEntries, 1024, \
2993 "Number of records in the ring buffer of sweeper activity") \
2994 \
2995 notproduct(intx, MemProfilingInterval, 500, \
2996 "Time between each invocation of the MemProfiler") \
2997 \
2998 develop(intx, MallocCatchPtr, -1, \
2999 "Hit breakpoint when mallocing/freeing this pointer") \
3000 \
3001 notproduct(ccstrlist, SuppressErrorAt, "", \
3002 "List of assertions (file:line) to muzzle") \
3003 \
3004 develop(intx, StackPrintLimit, 100, \
3005 "number of stack frames to print in VM-level stack dump") \
3006 \
3007 notproduct(intx, MaxElementPrintSize, 256, \
3008 "maximum number of elements to print") \
3009 \
3010 notproduct(intx, MaxSubklassPrintSize, 4, \
3011 "maximum number of subklasses to print when printing klass") \
3012 \
3013 product(intx, MaxInlineLevel, 9, \
3014 "maximum number of nested calls that are inlined") \
3015 range(0, max_jint) \
3016 \
3017 product(intx, MaxRecursiveInlineLevel, 1, \
3018 "maximum number of nested recursive calls that are inlined") \
3019 range(0, max_jint) \
3020 \
3021 develop(intx, MaxForceInlineLevel, 100, \
3022 "maximum number of nested calls that are forced for inlining " \
3023 "(using CompileCommand or marked w/ @ForceInline)") \
3024 range(0, max_jint) \
3025 \
3026 product_pd(intx, InlineSmallCode, \
3027 "Only inline already compiled methods if their code size is " \
3028 "less than this") \
3029 range(0, max_jint) \
3030 \
3031 product(intx, MaxInlineSize, 35, \
3032 "The maximum bytecode size of a method to be inlined") \
3033 range(0, max_jint) \
3034 \
3035 product_pd(intx, FreqInlineSize, \
3036 "The maximum bytecode size of a frequent method to be inlined") \
3037 range(0, max_jint) \
3038 \
3039 product(intx, MaxTrivialSize, 6, \
3040 "The maximum bytecode size of a trivial method to be inlined") \
3041 range(0, max_jint) \
3042 \
3043 product(intx, MinInliningThreshold, 250, \
3044 "The minimum invocation count a method needs to have to be " \
3045 "inlined") \
3046 range(0, max_jint) \
3047 \
3048 develop(intx, MethodHistogramCutoff, 100, \
3049 "The cutoff value for method invocation histogram (+CountCalls)") \
3050 \
3051 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
3052 "Number of interpreted methods to show in profile") \
3053 \
3054 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
3055 "Number of compiled methods to show in profile") \
3056 \
3057 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
3058 "Number of stub methods to show in profile") \
3059 \
3060 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3061 "Number of runtime stub nodes to show in profile") \
3062 \
3063 product(intx, ProfileIntervalsTicks, 100, \
3064 "Number of ticks between printing of interval profile " \
3065 "(+ProfileIntervals)") \
3066 range(0, max_intx) \
3067 \
3068 notproduct(intx, ScavengeALotInterval, 1, \
3069 "Interval between which scavenge will occur with +ScavengeALot") \
3070 \
3071 notproduct(intx, FullGCALotInterval, 1, \
3072 "Interval between which full gc will occur with +FullGCALot") \
3073 \
3074 notproduct(intx, FullGCALotStart, 0, \
3075 "For which invocation to start FullGCAlot") \
3076 \
3077 notproduct(intx, FullGCALotDummies, 32*K, \
3078 "Dummy object allocated with +FullGCALot, forcing all objects " \
3079 "to move") \
3080 \
3081 develop(intx, DontYieldALotInterval, 10, \
3082 "Interval between which yields will be dropped (milliseconds)") \
3083 \
3084 develop(intx, MinSleepInterval, 1, \
3085 "Minimum sleep() interval (milliseconds) when " \
3086 "ConvertSleepToYield is off (used for Solaris)") \
3087 \
3088 develop(intx, ProfilerPCTickThreshold, 15, \
3089 "Number of ticks in a PC buckets to be a hotspot") \
3090 \
3091 notproduct(intx, DeoptimizeALotInterval, 5, \
3092 "Number of exits until DeoptimizeALot kicks in") \
3093 \
3094 notproduct(intx, ZombieALotInterval, 5, \
3095 "Number of exits until ZombieALot kicks in") \
3096 \
3097 diagnostic(intx, MallocVerifyInterval, 0, \
3098 "If non-zero, verify C heap after every N calls to " \
3099 "malloc/realloc/free") \
3100 range(0, max_intx) \
3101 \
3102 diagnostic(intx, MallocVerifyStart, 0, \
3103 "If non-zero, start verifying C heap after Nth call to " \
3104 "malloc/realloc/free") \
3105 range(0, max_intx) \
3106 \
3107 diagnostic(uintx, MallocMaxTestWords, 0, \
3108 "If non-zero, maximum number of words that malloc/realloc can " \
3109 "allocate (for testing only)") \
3110 range(0, max_uintx) \
3111 \
3112 product(intx, TypeProfileWidth, 2, \
3113 "Number of receiver types to record in call/cast profile") \
3114 range(0, 8) \
3115 \
3116 experimental(intx, MethodProfileWidth, 0, \
3117 "Number of methods to record in call profile") \
3118 \
3119 develop(intx, BciProfileWidth, 2, \
3120 "Number of return bci's to record in ret profile") \
3121 \
3122 product(intx, PerMethodRecompilationCutoff, 400, \
3123 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3124 range(-1, max_intx) \
3125 \
3126 product(intx, PerBytecodeRecompilationCutoff, 200, \
3127 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3128 range(-1, max_intx) \
3129 \
3130 product(intx, PerMethodTrapLimit, 100, \
3131 "Limit on traps (of one kind) in a method (includes inlines)") \
3132 range(0, max_jint) \
3133 \
3134 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3135 "Limit on speculative traps (of one kind) in a method " \
3136 "(includes inlines)") \
3137 range(0, max_jint) \
3138 \
3139 product(intx, PerBytecodeTrapLimit, 4, \
3140 "Limit on traps (of one kind) at a particular BCI") \
3141 range(0, max_jint) \
3142 \
3143 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3144 "Extra method data trap entries for speculation") \
3145 \
3146 develop(intx, InlineFrequencyRatio, 20, \
3147 "Ratio of call site execution to caller method invocation") \
3148 range(0, max_jint) \
3149 \
3150 develop_pd(intx, InlineFrequencyCount, \
3151 "Count of call site execution necessary to trigger frequent " \
3152 "inlining") \
3153 range(0, max_jint) \
3154 \
3155 develop(intx, InlineThrowCount, 50, \
3156 "Force inlining of interpreted methods that throw this often") \
3157 range(0, max_jint) \
3158 \
3159 develop(intx, InlineThrowMaxSize, 200, \
3160 "Force inlining of throwing methods smaller than this") \
3161 range(0, max_jint) \
3162 \
3163 develop(intx, ProfilerNodeSize, 1024, \
3164 "Size in K to allocate for the Profile Nodes of each thread") \
3165 range(0, 1024) \
3166 \
3167 /* gc parameters */ \
3168 product(size_t, InitialHeapSize, 0, \
3169 "Initial heap size (in bytes); zero means use ergonomics") \
3170 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3171 \
3172 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3173 "Maximum heap size (in bytes)") \
3174 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3175 \
3176 product(size_t, OldSize, ScaleForWordSize(4*M), \
3177 "Initial tenured generation size (in bytes)") \
3178 range(0, max_uintx) \
3179 \
3180 product(size_t, NewSize, ScaleForWordSize(1*M), \
3181 "Initial new generation size (in bytes)") \
3182 constraint(NewSizeConstraintFunc,AfterErgo) \
3183 \
3184 product(size_t, MaxNewSize, max_uintx, \
3185 "Maximum new generation size (in bytes), max_uintx means set " \
3186 "ergonomically") \
3187 range(0, max_uintx) \
3188 \
3189 product_pd(size_t, HeapBaseMinAddress, \
3190 "OS specific low limit for heap base address") \
3191 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3192 \
3193 product(size_t, PretenureSizeThreshold, 0, \
3194 "Maximum size in bytes of objects allocated in DefNew " \
3195 "generation; zero means no maximum") \
3196 range(0, max_uintx) \
3197 \
3198 product(size_t, MinTLABSize, 2*K, \
3199 "Minimum allowed TLAB size (in bytes)") \
3200 range(1, max_uintx/2) \
3201 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3202 \
3203 product(size_t, TLABSize, 0, \
3204 "Starting TLAB size (in bytes); zero means set ergonomically") \
3205 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3206 \
3207 product(size_t, YoungPLABSize, 4096, \
3208 "Size of young gen promotion LAB's (in HeapWords)") \
3209 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3210 \
3211 product(size_t, OldPLABSize, 1024, \
3212 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3213 "of blocks to attempt to claim when refilling CMS LAB's") \
3214 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3215 \
3216 product(uintx, TLABAllocationWeight, 35, \
3217 "Allocation averaging weight") \
3218 range(0, 100) \
3219 \
3220 /* Limit the lower bound of this flag to 1 as it is used */ \
3221 /* in a division expression. */ \
3222 product(uintx, TLABWasteTargetPercent, 1, \
3223 "Percentage of Eden that can be wasted") \
3224 range(1, 100) \
3225 \
3226 product(uintx, TLABRefillWasteFraction, 64, \
3227 "Maximum TLAB waste at a refill (internal fragmentation)") \
3228 range(1, max_juint) \
3229 \
3230 product(uintx, TLABWasteIncrement, 4, \
3231 "Increment allowed waste at slow allocation") \
3232 range(0, max_jint) \
3233 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3234 \
3235 product(uintx, SurvivorRatio, 8, \
3236 "Ratio of eden/survivor space size") \
3237 range(1, max_uintx-2) \
3238 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3239 \
3240 product(uintx, NewRatio, 2, \
3241 "Ratio of old/new generation sizes") \
3242 range(0, max_uintx-1) \
3243 \
3244 product_pd(size_t, NewSizeThreadIncrease, \
3245 "Additional size added to desired new generation size per " \
3246 "non-daemon thread (in bytes)") \
3247 range(0, max_uintx) \
3248 \
3249 product_pd(size_t, MetaspaceSize, \
3250 "Initial threshold (in bytes) at which a garbage collection " \
3251 "is done to reduce Metaspace usage") \
3252 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3253 \
3254 product(size_t, MaxMetaspaceSize, max_uintx, \
3255 "Maximum size of Metaspaces (in bytes)") \
3256 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3257 \
3258 product(size_t, CompressedClassSpaceSize, 1*G, \
3259 "Maximum size of class area in Metaspace when compressed " \
3260 "class pointers are used") \
3261 range(1*M, 3*G) \
3262 \
3263 manageable(uintx, MinHeapFreeRatio, 40, \
3264 "The minimum percentage of heap free after GC to avoid expansion."\
3265 " For most GCs this applies to the old generation. In G1 and" \
3266 " ParallelGC it applies to the whole heap.") \
3267 range(0, 100) \
3268 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3269 \
3270 manageable(uintx, MaxHeapFreeRatio, 70, \
3271 "The maximum percentage of heap free after GC to avoid shrinking."\
3272 " For most GCs this applies to the old generation. In G1 and" \
3273 " ParallelGC it applies to the whole heap.") \
3274 range(0, 100) \
3275 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3276 \
3277 product(bool, ShrinkHeapInSteps, true, \
3278 "When disabled, informs the GC to shrink the java heap directly" \
3279 " to the target size at the next full GC rather than requiring" \
3280 " smaller steps during multiple full GCs.") \
3281 \
3282 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3283 "Number of milliseconds per MB of free space in the heap") \
3284 range(0, max_intx) \
3285 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3286 \
3287 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3288 "The minimum change in heap space due to GC (in bytes)") \
3289 range(0, max_uintx) \
3290 \
3291 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3292 "The minimum expansion of Metaspace (in bytes)") \
3293 range(0, max_uintx) \
3294 \
3295 product(uintx, MaxMetaspaceFreeRatio, 70, \
3296 "The maximum percentage of Metaspace free after GC to avoid " \
3297 "shrinking") \
3298 range(0, 100) \
3299 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3300 \
3301 product(uintx, MinMetaspaceFreeRatio, 40, \
3302 "The minimum percentage of Metaspace free after GC to avoid " \
3303 "expansion") \
3304 range(0, 99) \
3305 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3306 \
3307 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3308 "The maximum expansion of Metaspace without full GC (in bytes)") \
3309 range(0, max_uintx) \
3310 \
3311 product(uintx, QueuedAllocationWarningCount, 0, \
3312 "Number of times an allocation that queues behind a GC " \
3313 "will retry before printing a warning") \
3314 range(0, max_uintx) \
3315 \
3316 diagnostic(uintx, VerifyGCStartAt, 0, \
3317 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3318 range(0, max_uintx) \
3319 \
3320 diagnostic(intx, VerifyGCLevel, 0, \
3321 "Generation level at which to start +VerifyBefore/AfterGC") \
3322 range(0, 1) \
3323 \
3324 product(uintx, MaxTenuringThreshold, 15, \
3325 "Maximum value for tenuring threshold") \
3326 range(0, markOopDesc::max_age + 1) \
3327 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3328 \
3329 product(uintx, InitialTenuringThreshold, 7, \
3330 "Initial value for tenuring threshold") \
3331 range(0, markOopDesc::max_age + 1) \
3332 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3333 \
3334 product(uintx, TargetSurvivorRatio, 50, \
3335 "Desired percentage of survivor space used after scavenge") \
3336 range(0, 100) \
3337 \
3338 product(uintx, MarkSweepDeadRatio, 5, \
3339 "Percentage (0-100) of the old gen allowed as dead wood. " \
3340 "Serial mark sweep treats this as both the minimum and maximum " \
3341 "value. " \
3342 "CMS uses this value only if it falls back to mark sweep. " \
3343 "Par compact uses a variable scale based on the density of the " \
3344 "generation and treats this as the maximum value when the heap " \
3345 "is either completely full or completely empty. Par compact " \
3346 "also has a smaller default value; see arguments.cpp.") \
3347 range(0, 100) \
3348 \
3349 product(uint, MarkSweepAlwaysCompactCount, 4, \
3350 "How often should we fully compact the heap (ignoring the dead " \
3351 "space parameters)") \
3352 range(1, max_juint) \
3353 \
3354 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3355 "Delay between expansion and allocation (in milliseconds)") \
3356 \
3357 develop(uintx, GCWorkerDelayMillis, 0, \
3358 "Delay in scheduling GC workers (in milliseconds)") \
3359 \
3360 product(intx, DeferThrSuspendLoopCount, 4000, \
3361 "(Unstable) Number of times to iterate in safepoint loop " \
3362 "before blocking VM threads ") \
3363 range(-1, max_jint-1) \
3364 \
3365 product(intx, DeferPollingPageLoopCount, -1, \
3366 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3367 "before changing safepoint polling page to RO ") \
3368 range(-1, max_jint-1) \
3369 \
3370 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3371 range(0, max_intx) \
3372 \
3373 product(bool, PSChunkLargeArrays, true, \
3374 "Process large arrays in chunks") \
3375 \
3376 product(uintx, GCDrainStackTargetSize, 64, \
3377 "Number of entries we will try to leave on the stack " \
3378 "during parallel gc") \
3379 range(0, max_juint) \
3380 \
3381 /* stack parameters */ \
3382 product_pd(intx, StackYellowPages, \
3383 "Number of yellow zone (recoverable overflows) pages of size " \
3384 "4KB. If pages are bigger yellow zone is aligned up.") \
3385 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3386 \
3387 product_pd(intx, StackRedPages, \
3388 "Number of red zone (unrecoverable overflows) pages of size " \
3389 "4KB. If pages are bigger red zone is aligned up.") \
3390 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3391 \
3392 product_pd(intx, StackReservedPages, \
3393 "Number of reserved zone (reserved to annotated methods) pages" \
3394 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3395 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3396 \
3397 product(bool, RestrictReservedStack, true, \
3398 "Restrict @ReservedStackAccess to trusted classes") \
3399 \
3400 /* greater stack shadow pages can't generate instruction to bang stack */ \
3401 product_pd(intx, StackShadowPages, \
3402 "Number of shadow zone (for overflow checking) pages of size " \
3403 "4KB. If pages are bigger shadow zone is aligned up. " \
3404 "This should exceed the depth of the VM and native call stack.") \
3405 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3406 \
3407 product_pd(intx, ThreadStackSize, \
3408 "Thread Stack Size (in Kbytes)") \
3409 range(0, (max_intx-os::vm_page_size())/(1 * K)) \
3410 \
3411 product_pd(intx, VMThreadStackSize, \
3412 "Non-Java Thread Stack Size (in Kbytes)") \
3413 range(0, max_intx/(1 * K)) \
3414 \
3415 product_pd(intx, CompilerThreadStackSize, \
3416 "Compiler Thread Stack Size (in Kbytes)") \
3417 range(0, max_intx/(1 * K)) \
3418 \
3419 develop_pd(size_t, JVMInvokeMethodSlack, \
3420 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3421 \
3422 /* code cache parameters */ \
3423 /* ppc64/tiered compilation has large code-entry alignment. */ \
3424 develop(uintx, CodeCacheSegmentSize, \
3425 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \
3426 "Code cache segment size (in bytes) - smallest unit of " \
3427 "allocation") \
3428 range(1, 1024) \
3429 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3430 \
3431 develop_pd(intx, CodeEntryAlignment, \
3432 "Code entry alignment for generated code (in bytes)") \
3433 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3434 \
3435 product_pd(intx, OptoLoopAlignment, \
3436 "Align inner loops to zero relative to this modulus") \
3437 range(1, 16) \
3438 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3439 \
3440 product_pd(uintx, InitialCodeCacheSize, \
3441 "Initial code cache size (in bytes)") \
3442 range(0, max_uintx) \
3443 \
3444 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3445 "Minimum code cache size (in bytes) required to start VM.") \
3446 range(0, max_uintx) \
3447 \
3448 product(bool, SegmentedCodeCache, false, \
3449 "Use a segmented code cache") \
3450 \
3451 product_pd(uintx, ReservedCodeCacheSize, \
3452 "Reserved code cache size (in bytes) - maximum code cache size") \
3453 range(0, max_uintx) \
3454 \
3455 product_pd(uintx, NonProfiledCodeHeapSize, \
3456 "Size of code heap with non-profiled methods (in bytes)") \
3457 range(0, max_uintx) \
3458 \
3459 product_pd(uintx, ProfiledCodeHeapSize, \
3460 "Size of code heap with profiled methods (in bytes)") \
3461 range(0, max_uintx) \
3462 \
3463 product_pd(uintx, NonNMethodCodeHeapSize, \
3464 "Size of code heap with non-nmethods (in bytes)") \
3465 range(0, max_uintx) \
3466 \
3467 product_pd(uintx, CodeCacheExpansionSize, \
3468 "Code cache expansion size (in bytes)") \
3469 range(0, max_uintx) \
3470 \
3471 develop_pd(uintx, CodeCacheMinBlockLength, \
3472 "Minimum number of segments in a code cache block") \
3473 range(1, 100) \
3474 \
3475 notproduct(bool, ExitOnFullCodeCache, false, \
3476 "Exit the VM if we fill the code cache") \
3477 \
3478 product(bool, UseCodeCacheFlushing, true, \
3479 "Remove cold/old nmethods from the code cache") \
3480 \
3481 product(uintx, StartAggressiveSweepingAt, 10, \
3482 "Start aggressive sweeping if X[%] of the code cache is free." \
3483 "Segmented code cache: X[%] of the non-profiled heap." \
3484 "Non-segmented code cache: X[%] of the total code cache") \
3485 range(0, 100) \
3486 \
3487 /* interpreter debugging */ \
3488 develop(intx, BinarySwitchThreshold, 5, \
3489 "Minimal number of lookupswitch entries for rewriting to binary " \
3490 "switch") \
3491 \
3492 develop(intx, StopInterpreterAt, 0, \
3493 "Stop interpreter execution at specified bytecode number") \
3494 \
3495 develop(intx, TraceBytecodesAt, 0, \
3496 "Trace bytecodes starting with specified bytecode number") \
3497 \
3498 /* compiler interface */ \
3499 develop(intx, CIStart, 0, \
3500 "The id of the first compilation to permit") \
3501 \
3502 develop(intx, CIStop, max_jint, \
3503 "The id of the last compilation to permit") \
3504 \
3505 develop(intx, CIStartOSR, 0, \
3506 "The id of the first osr compilation to permit " \
3507 "(CICountOSR must be on)") \
3508 \
3509 develop(intx, CIStopOSR, max_jint, \
3510 "The id of the last osr compilation to permit " \
3511 "(CICountOSR must be on)") \
3512 \
3513 develop(intx, CIBreakAtOSR, -1, \
3514 "The id of osr compilation to break at") \
3515 \
3516 develop(intx, CIBreakAt, -1, \
3517 "The id of compilation to break at") \
3518 \
3519 product(ccstrlist, CompileOnly, "", \
3520 "List of methods (pkg/class.name) to restrict compilation to") \
3521 \
3522 product(ccstr, CompileCommandFile, NULL, \
3523 "Read compiler commands from this file [.hotspot_compiler]") \
3524 \
3525 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3526 "Read compiler directives from this file") \
3527 \
3528 product(ccstrlist, CompileCommand, "", \
3529 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3530 \
3531 develop(bool, ReplayCompiles, false, \
3532 "Enable replay of compilations from ReplayDataFile") \
3533 \
3534 product(ccstr, ReplayDataFile, NULL, \
3535 "File containing compilation replay information" \
3536 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3537 \
3538 product(ccstr, InlineDataFile, NULL, \
3539 "File containing inlining replay information" \
3540 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3541 \
3542 develop(intx, ReplaySuppressInitializers, 2, \
3543 "Control handling of class initialization during replay: " \
3544 "0 - don't do anything special; " \
3545 "1 - treat all class initializers as empty; " \
3546 "2 - treat class initializers for application classes as empty; " \
3547 "3 - allow all class initializers to run during bootstrap but " \
3548 " pretend they are empty after starting replay") \
3549 range(0, 3) \
3550 \
3551 develop(bool, ReplayIgnoreInitErrors, false, \
3552 "Ignore exceptions thrown during initialization for replay") \
3553 \
3554 product(bool, DumpReplayDataOnError, true, \
3555 "Record replay data for crashing compiler threads") \
3556 \
3557 product(bool, CICompilerCountPerCPU, false, \
3558 "1 compiler thread for log(N CPUs)") \
3559 \
3560 develop(intx, CIFireOOMAt, -1, \
3561 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3562 "(non-negative value throws OOM after this many CI accesses " \
3563 "in each compile)") \
3564 notproduct(intx, CICrashAt, -1, \
3565 "id of compilation to trigger assert in compiler thread for " \
3566 "the purpose of testing, e.g. generation of replay data") \
3567 notproduct(bool, CIObjectFactoryVerify, false, \
3568 "enable potentially expensive verification in ciObjectFactory") \
3569 \
3570 /* Priorities */ \
3571 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3572 \
3573 product(intx, ThreadPriorityPolicy, 0, \
3574 "0 : Normal. "\
3575 " VM chooses priorities that are appropriate for normal "\
3576 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3577 " to normal native priority. Java priorities below " \
3578 " NORM_PRIORITY map to lower native priority values. On "\
3579 " Windows applications are allowed to use higher native "\
3580 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3581 " not use the highest possible native priority, "\
3582 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3583 " system threads. On Linux thread priorities are ignored "\
3584 " because the OS does not support static priority in "\
3585 " SCHED_OTHER scheduling class which is the only choice for "\
3586 " non-root, non-realtime applications. "\
3587 "1 : Aggressive. "\
3588 " Java thread priorities map over to the entire range of "\
3589 " native thread priorities. Higher Java thread priorities map "\
3590 " to higher native thread priorities. This policy should be "\
3591 " used with care, as sometimes it can cause performance "\
3592 " degradation in the application and/or the entire system. On "\
3593 " Linux this policy requires root privilege.") \
3594 range(0, 1) \
3595 \
3596 product(bool, ThreadPriorityVerbose, false, \
3597 "Print priority changes") \
3598 \
3599 product(intx, CompilerThreadPriority, -1, \
3600 "The native priority at which compiler threads should run " \
3601 "(-1 means no change)") \
3602 range(min_jint, max_jint) \
3603 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3604 \
3605 product(intx, VMThreadPriority, -1, \
3606 "The native priority at which the VM thread should run " \
3607 "(-1 means no change)") \
3608 range(-1, 127) \
3609 \
3610 product(bool, CompilerThreadHintNoPreempt, true, \
3611 "(Solaris only) Give compiler threads an extra quanta") \
3612 \
3613 product(bool, VMThreadHintNoPreempt, false, \
3614 "(Solaris only) Give VM thread an extra quanta") \
3615 \
3616 product(intx, JavaPriority1_To_OSPriority, -1, \
3617 "Map Java priorities to OS priorities") \
3618 range(-1, 127) \
3619 \
3620 product(intx, JavaPriority2_To_OSPriority, -1, \
3621 "Map Java priorities to OS priorities") \
3622 range(-1, 127) \
3623 \
3624 product(intx, JavaPriority3_To_OSPriority, -1, \
3625 "Map Java priorities to OS priorities") \
3626 range(-1, 127) \
3627 \
3628 product(intx, JavaPriority4_To_OSPriority, -1, \
3629 "Map Java priorities to OS priorities") \
3630 range(-1, 127) \
3631 \
3632 product(intx, JavaPriority5_To_OSPriority, -1, \
3633 "Map Java priorities to OS priorities") \
3634 range(-1, 127) \
3635 \
3636 product(intx, JavaPriority6_To_OSPriority, -1, \
3637 "Map Java priorities to OS priorities") \
3638 range(-1, 127) \
3639 \
3640 product(intx, JavaPriority7_To_OSPriority, -1, \
3641 "Map Java priorities to OS priorities") \
3642 range(-1, 127) \
3643 \
3644 product(intx, JavaPriority8_To_OSPriority, -1, \
3645 "Map Java priorities to OS priorities") \
3646 range(-1, 127) \
3647 \
3648 product(intx, JavaPriority9_To_OSPriority, -1, \
3649 "Map Java priorities to OS priorities") \
3650 range(-1, 127) \
3651 \
3652 product(intx, JavaPriority10_To_OSPriority,-1, \
3653 "Map Java priorities to OS priorities") \
3654 range(-1, 127) \
3655 \
3656 experimental(bool, UseCriticalJavaThreadPriority, false, \
3657 "Java thread priority 10 maps to critical scheduling priority") \
3658 \
3659 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3660 "Compiler thread(s) run at critical scheduling priority") \
3661 \
3662 experimental(bool, UseCriticalCMSThreadPriority, false, \
3663 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3664 \
3665 /* compiler debugging */ \
3666 notproduct(intx, CompileTheWorldStartAt, 1, \
3667 "First class to consider when using +CompileTheWorld") \
3668 \
3669 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3670 "Last class to consider when using +CompileTheWorld") \
3671 \
3672 develop(intx, NewCodeParameter, 0, \
3673 "Testing Only: Create a dedicated integer parameter before " \
3674 "putback") \
3675 \
3676 /* new oopmap storage allocation */ \
3677 develop(intx, MinOopMapAllocation, 8, \
3678 "Minimum number of OopMap entries in an OopMapSet") \
3679 \
3680 /* Background Compilation */ \
3681 develop(intx, LongCompileThreshold, 50, \
3682 "Used with +TraceLongCompiles") \
3683 \
3684 /* recompilation */ \
3685 product_pd(intx, CompileThreshold, \
3686 "number of interpreted method invocations before (re-)compiling") \
3687 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3688 \
3689 product(double, CompileThresholdScaling, 1.0, \
3690 "Factor to control when first compilation happens " \
3691 "(both with and without tiered compilation): " \
3692 "values greater than 1.0 delay counter overflow, " \
3693 "values between 0 and 1.0 rush counter overflow, " \
3694 "value of 1.0 leaves compilation thresholds unchanged " \
3695 "value of 0.0 is equivalent to -Xint. " \
3696 "" \
3697 "Flag can be set as per-method option. " \
3698 "If a value is specified for a method, compilation thresholds " \
3699 "for that method are scaled by both the value of the global flag "\
3700 "and the value of the per-method flag.") \
3701 range(0.0, DBL_MAX) \
3702 \
3703 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3704 "Interpreter (tier 0) invocation notification frequency") \
3705 range(0, 30) \
3706 \
3707 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3708 "C1 without MDO (tier 2) invocation notification frequency") \
3709 range(0, 30) \
3710 \
3711 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3712 "C1 with MDO profiling (tier 3) invocation notification " \
3713 "frequency") \
3714 range(0, 30) \
3715 \
3716 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3717 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3718 range(0, 30) \
3719 \
3720 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3721 "Interpreter (tier 0) invocation notification frequency") \
3722 range(0, 30) \
3723 \
3724 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3725 "C1 without MDO (tier 2) invocation notification frequency") \
3726 range(0, 30) \
3727 \
3728 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3729 "C1 with MDO profiling (tier 3) invocation notification " \
3730 "frequency") \
3731 range(0, 30) \
3732 \
3733 product(intx, Tier2CompileThreshold, 0, \
3734 "threshold at which tier 2 compilation is invoked") \
3735 range(0, max_jint) \
3736 \
3737 product(intx, Tier2BackEdgeThreshold, 0, \
3738 "Back edge threshold at which tier 2 compilation is invoked") \
3739 range(0, max_jint) \
3740 \
3741 product(intx, Tier3InvocationThreshold, 200, \
3742 "Compile if number of method invocations crosses this " \
3743 "threshold") \
3744 range(0, max_jint) \
3745 \
3746 product(intx, Tier3MinInvocationThreshold, 100, \
3747 "Minimum invocation to compile at tier 3") \
3748 range(0, max_jint) \
3749 \
3750 product(intx, Tier3CompileThreshold, 2000, \
3751 "Threshold at which tier 3 compilation is invoked (invocation " \
3752 "minimum must be satisfied)") \
3753 range(0, max_jint) \
3754 \
3755 product(intx, Tier3BackEdgeThreshold, 60000, \
3756 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3757 range(0, max_jint) \
3758 \
3759 product(intx, Tier4InvocationThreshold, 5000, \
3760 "Compile if number of method invocations crosses this " \
3761 "threshold") \
3762 range(0, max_jint) \
3763 \
3764 product(intx, Tier4MinInvocationThreshold, 600, \
3765 "Minimum invocation to compile at tier 4") \
3766 range(0, max_jint) \
3767 \
3768 product(intx, Tier4CompileThreshold, 15000, \
3769 "Threshold at which tier 4 compilation is invoked (invocation " \
3770 "minimum must be satisfied") \
3771 range(0, max_jint) \
3772 \
3773 product(intx, Tier4BackEdgeThreshold, 40000, \
3774 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3775 range(0, max_jint) \
3776 \
3777 product(intx, Tier3DelayOn, 5, \
3778 "If C2 queue size grows over this amount per compiler thread " \
3779 "stop compiling at tier 3 and start compiling at tier 2") \
3780 range(0, max_jint) \
3781 \
3782 product(intx, Tier3DelayOff, 2, \
3783 "If C2 queue size is less than this amount per compiler thread " \
3784 "allow methods compiled at tier 2 transition to tier 3") \
3785 range(0, max_jint) \
3786 \
3787 product(intx, Tier3LoadFeedback, 5, \
3788 "Tier 3 thresholds will increase twofold when C1 queue size " \
3789 "reaches this amount per compiler thread") \
3790 range(0, max_jint) \
3791 \
3792 product(intx, Tier4LoadFeedback, 3, \
3793 "Tier 4 thresholds will increase twofold when C2 queue size " \
3794 "reaches this amount per compiler thread") \
3795 range(0, max_jint) \
3796 \
3797 product(intx, TieredCompileTaskTimeout, 50, \
3798 "Kill compile task if method was not used within " \
3799 "given timeout in milliseconds") \
3800 range(0, max_intx) \
3801 \
3802 product(intx, TieredStopAtLevel, 4, \
3803 "Stop at given compilation level") \
3804 range(0, 4) \
3805 \
3806 product(intx, Tier0ProfilingStartPercentage, 200, \
3807 "Start profiling in interpreter if the counters exceed tier 3 " \
3808 "thresholds by the specified percentage") \
3809 range(0, max_jint) \
3810 \
3811 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3812 "Increase the compile threshold for C1 compilation if the code " \
3813 "cache is filled by the specified percentage") \
3814 range(0, 99) \
3815 \
3816 product(intx, TieredRateUpdateMinTime, 1, \
3817 "Minimum rate sampling interval (in milliseconds)") \
3818 range(0, max_intx) \
3819 \
3820 product(intx, TieredRateUpdateMaxTime, 25, \
3821 "Maximum rate sampling interval (in milliseconds)") \
3822 range(0, max_intx) \
3823 \
3824 product_pd(bool, TieredCompilation, \
3825 "Enable tiered compilation") \
3826 \
3827 product(bool, PrintTieredEvents, false, \
3828 "Print tiered events notifications") \
3829 \
3830 product_pd(intx, OnStackReplacePercentage, \
3831 "NON_TIERED number of method invocations/branches (expressed as " \
3832 "% of CompileThreshold) before (re-)compiling OSR code") \
3833 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3834 \
3835 product(intx, InterpreterProfilePercentage, 33, \
3836 "NON_TIERED number of method invocations/branches (expressed as " \
3837 "% of CompileThreshold) before profiling in the interpreter") \
3838 range(0, 100) \
3839 \
3840 develop(intx, MaxRecompilationSearchLength, 10, \
3841 "The maximum number of frames to inspect when searching for " \
3842 "recompilee") \
3843 \
3844 develop(intx, MaxInterpretedSearchLength, 3, \
3845 "The maximum number of interpreted frames to skip when searching "\
3846 "for recompilee") \
3847 \
3848 develop(intx, DesiredMethodLimit, 8000, \
3849 "The desired maximum method size (in bytecodes) after inlining") \
3850 \
3851 develop(intx, HugeMethodLimit, 8000, \
3852 "Don't compile methods larger than this if " \
3853 "+DontCompileHugeMethods") \
3854 \
3855 /* New JDK 1.4 reflection implementation */ \
3856 \
3857 develop(intx, FastSuperclassLimit, 8, \
3858 "Depth of hardwired instanceof accelerator array") \
3859 \
3860 /* Properties for Java libraries */ \
3861 \
3862 product(size_t, MaxDirectMemorySize, 0, \
3863 "Maximum total size of NIO direct-buffer allocations") \
3864 range(0, (size_t)SIZE_MAX) \
3865 \
3866 /* Flags used for temporary code during development */ \
3867 \
3868 diagnostic(bool, UseNewCode, false, \
3869 "Testing Only: Use the new version while testing") \
3870 \
3871 diagnostic(bool, UseNewCode2, false, \
3872 "Testing Only: Use the new version while testing") \
3873 \
3874 diagnostic(bool, UseNewCode3, false, \
3875 "Testing Only: Use the new version while testing") \
3876 \
3877 /* flags for performance data collection */ \
3878 \
3879 product(bool, UsePerfData, falseInEmbedded, \
3880 "Flag to disable jvmstat instrumentation for performance testing "\
3881 "and problem isolation purposes") \
3882 \
3883 product(bool, PerfDataSaveToFile, false, \
3884 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3885 \
3886 product(ccstr, PerfDataSaveFile, NULL, \
3887 "Save PerfData memory to the specified absolute pathname. " \
3888 "The string %p in the file name (if present) " \
3889 "will be replaced by pid") \
3890 \
3891 product(intx, PerfDataSamplingInterval, 50, \
3892 "Data sampling interval (in milliseconds)") \
3893 range(PeriodicTask::min_interval, max_jint) \
3894 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3895 \
3896 develop(bool, PerfTraceDataCreation, false, \
3897 "Trace creation of Performance Data Entries") \
3898 \
3899 develop(bool, PerfTraceMemOps, false, \
3900 "Trace PerfMemory create/attach/detach calls") \
3901 \
3902 product(bool, PerfDisableSharedMem, false, \
3903 "Store performance data in standard memory") \
3904 \
3905 product(intx, PerfDataMemorySize, 32*K, \
3906 "Size of performance data memory region. Will be rounded " \
3907 "up to a multiple of the native os page size.") \
3908 range(128, 32*64*K) \
3909 \
3910 product(intx, PerfMaxStringConstLength, 1024, \
3911 "Maximum PerfStringConstant string length before truncation") \
3912 range(32, 32*K) \
3913 \
3914 product(bool, PerfAllowAtExitRegistration, false, \
3915 "Allow registration of atexit() methods") \
3916 \
3917 product(bool, PerfBypassFileSystemCheck, false, \
3918 "Bypass Win32 file system criteria checks (Windows Only)") \
3919 \
3920 product(intx, UnguardOnExecutionViolation, 0, \
3921 "Unguard page and retry on no-execute fault (Win32 only) " \
3922 "0=off, 1=conservative, 2=aggressive") \
3923 range(0, 2) \
3924 \
3925 /* Serviceability Support */ \
3926 \
3927 product(bool, ManagementServer, false, \
3928 "Create JMX Management Server") \
3929 \
3930 product(bool, DisableAttachMechanism, false, \
3931 "Disable mechanism that allows tools to attach to this VM") \
3932 \
3933 product(bool, StartAttachListener, false, \
3934 "Always start Attach Listener at VM startup") \
3935 \
3936 manageable(bool, PrintConcurrentLocks, false, \
3937 "Print java.util.concurrent locks in thread dump") \
3938 \
3939 product(bool, TransmitErrorReport, false, \
3940 "Enable error report transmission on erroneous termination") \
3941 \
3942 product(ccstr, ErrorReportServer, NULL, \
3943 "Override built-in error report server address") \
3944 \
3945 /* Shared spaces */ \
3946 \
3947 product(bool, UseSharedSpaces, true, \
3948 "Use shared spaces for metadata") \
3949 \
3950 product(bool, VerifySharedSpaces, false, \
3951 "Verify shared spaces (false for default archive, true for " \
3952 "archive specified by -XX:SharedArchiveFile)") \
3953 \
3954 product(bool, RequireSharedSpaces, false, \
3955 "Require shared spaces for metadata") \
3956 \
3957 product(bool, DumpSharedSpaces, false, \
3958 "Special mode: JVM reads a class list, loads classes, builds " \
3959 "shared spaces, and dumps the shared spaces to a file to be " \
3960 "used in future JVM runs") \
3961 \
3962 product(bool, PrintSharedSpaces, false, \
3963 "Print usage of shared spaces") \
3964 \
3965 product(bool, PrintSharedArchiveAndExit, false, \
3966 "Print shared archive file contents") \
3967 \
3968 product(bool, PrintSharedDictionary, false, \
3969 "If PrintSharedArchiveAndExit is true, also print the shared " \
3970 "dictionary") \
3971 \
3972 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \
3973 "Size of read-write space for metadata (in bytes)") \
3974 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \
3975 \
3976 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \
3977 "Size of read-only space for metadata (in bytes)") \
3978 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \
3979 \
3980 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \
3981 "Size of the shared miscellaneous data area (in bytes)") \
3982 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \
3983 \
3984 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \
3985 "Size of the shared miscellaneous code area (in bytes)") \
3986 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \
3987 \
3988 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
3989 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3990 "Address to allocate shared memory region for class data") \
3991 range(0, SIZE_MAX) \
3992 \
3993 product(uintx, SharedSymbolTableBucketSize, 4, \
3994 "Average number of symbols per bucket in shared table") \
3995 range(2, 246) \
3996 \
3997 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
3998 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3999 "classes. Just exclude them from the shared dictionary.") \
4000 \
4001 diagnostic(bool, PrintMethodHandleStubs, false, \
4002 "Print generated stub code for method handles") \
4003 \
4004 develop(bool, TraceMethodHandles, false, \
4005 "trace internal method handle operations") \
4006 \
4007 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4008 "perform extra checks when constructing method handles") \
4009 \
4010 diagnostic(bool, ShowHiddenFrames, false, \
4011 "show method handle implementation frames (usually hidden)") \
4012 \
4013 experimental(bool, TrustFinalNonStaticFields, false, \
4014 "trust final non-static declarations for constant folding") \
4015 \
4016 diagnostic(bool, FoldStableValues, true, \
4017 "Optimize loads from stable fields (marked w/ @Stable)") \
4018 \
4019 develop(bool, TraceInvokeDynamic, false, \
4020 "trace internal invoke dynamic operations") \
4021 \
4022 diagnostic(bool, PauseAtStartup, false, \
4023 "Causes the VM to pause at startup time and wait for the pause " \
4024 "file to be removed (default: ./vm.paused.<pid>)") \
4025 \
4026 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4027 "The file to create and for whose removal to await when pausing " \
4028 "at startup. (default: ./vm.paused.<pid>)") \
4029 \
4030 diagnostic(bool, PauseAtExit, false, \
4031 "Pause and wait for keypress on exit if a debugger is attached") \
4032 \
4033 product(bool, ExtendedDTraceProbes, false, \
4034 "Enable performance-impacting dtrace probes") \
4035 \
4036 product(bool, DTraceMethodProbes, false, \
4037 "Enable dtrace probes for method-entry and method-exit") \
4038 \
4039 product(bool, DTraceAllocProbes, false, \
4040 "Enable dtrace probes for object allocation") \
4041 \
4042 product(bool, DTraceMonitorProbes, false, \
4043 "Enable dtrace probes for monitor events") \
4044 \
4045 product(bool, RelaxAccessControlCheck, false, \
4046 "Relax the access control checks in the verifier") \
4047 \
4048 product(uintx, StringTableSize, defaultStringTableSize, \
4049 "Number of buckets in the interned String table") \
4050 range(minimumStringTableSize, 111*defaultStringTableSize) \
4051 \
4052 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4053 "Number of buckets in the JVM internal Symbol table") \
4054 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4055 \
4056 product(bool, UseStringDeduplication, false, \
4057 "Use string deduplication") \
4058 \
4059 product(uintx, StringDeduplicationAgeThreshold, 3, \
4060 "A string must reach this age (or be promoted to an old region) " \
4061 "to be considered for deduplication") \
4062 range(1, markOopDesc::max_age) \
4063 \
4064 diagnostic(bool, StringDeduplicationResizeALot, false, \
4065 "Force table resize every time the table is scanned") \
4066 \
4067 diagnostic(bool, StringDeduplicationRehashALot, false, \
4068 "Force table rehash every time the table is scanned") \
4069 \
4070 diagnostic(bool, WhiteBoxAPI, false, \
4071 "Enable internal testing APIs") \
4072 \
4073 experimental(intx, SurvivorAlignmentInBytes, 0, \
4074 "Default survivor space alignment in bytes") \
4075 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4076 \
4077 product(bool , AllowNonVirtualCalls, false, \
4078 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4079 \
4080 product(ccstr, DumpLoadedClassList, NULL, \
4081 "Dump the names all loaded classes, that could be stored into " \
4082 "the CDS archive, in the specified file") \
4083 \
4084 product(ccstr, SharedClassListFile, NULL, \
4085 "Override the default CDS class list") \
4086 \
4087 diagnostic(ccstr, SharedArchiveFile, NULL, \
4088 "Override the default location of the CDS archive file") \
4089 \
4090 product(ccstr, ExtraSharedClassListFile, NULL, \
4091 "Extra classlist for building the CDS archive file") \
4092 \
4093 experimental(size_t, ArrayAllocatorMallocLimit, \
4094 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4095 "Allocation less than this value will be allocated " \
4096 "using malloc. Larger allocations will use mmap.") \
4097 \
4098 experimental(bool, AlwaysAtomicAccesses, false, \
4099 "Accesses to all variables should always be atomic") \
4100 \
4101 product(bool, EnableTracing, false, \
4102 "Enable event-based tracing") \
4103 \
4104 product(bool, UseLockedTracing, false, \
4105 "Use locked-tracing when doing event-based tracing") \
4106 \
4107 diagnostic(bool, UseUnalignedAccesses, false, \
4108 "Use unaligned memory accesses in Unsafe") \
4109 \
4110 product_pd(bool, PreserveFramePointer, \
4111 "Use the FP register for holding the frame pointer " \
4112 "and not as a general purpose register.") \
4113 \
4114 diagnostic(bool, CheckIntrinsics, true, \
4115 "When a class C is loaded, check that " \
4116 "(1) all intrinsics defined by the VM for class C are present "\
4117 "in the loaded class file and are marked with the " \
4118 "@HotSpotIntrinsicCandidate annotation, that " \
4119 "(2) there is an intrinsic registered for all loaded methods " \
4120 "that are annotated with the @HotSpotIntrinsicCandidate " \
4121 "annotation, and that " \
4122 "(3) no orphan methods exist for class C (i.e., methods for " \
4123 "which the VM declares an intrinsic but that are not declared "\
4124 "in the loaded class C. " \
4125 "Check (3) is available only in debug builds.") \
4126 \
4127 develop_pd(intx, InitArrayShortSize, \
4128 "Threshold small size (in bytes) for clearing arrays. " \
4129 "Anything this size or smaller may get converted to discrete " \
4130 "scalar stores.") \
4131 range(0, max_intx) \
4132 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
4133 \
4134 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4135 "Disable backwards compatibility for compile commands.") \
4136 \
4137 diagnostic(bool, CompilerDirectivesPrint, false, \
4138 "Print compiler directives on installation.") \
4139 diagnostic(int, CompilerDirectivesLimit, 50, \
4140 "Limit on number of compiler directives.")
4141
4142
4143 /*
4144 * Macros for factoring of globals
4145 */
4146
4147 // Interface macros
4148 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4149 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4150 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4151 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4152 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4153 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4154 #ifdef PRODUCT
4155 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4156 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4157 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4158 #else
4159 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4160 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4161 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4162 #endif // PRODUCT
4163 // Special LP64 flags, product only needed for now.
4164 #ifdef _LP64
4165 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4166 #else
4167 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4168 #endif // _LP64
4169
4170 // Implementation macros
4171 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4172 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4173 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4174 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4175 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4176 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4177 #ifdef PRODUCT
4178 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4179 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4180 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4181 #else
4182 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4183 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4184 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4185 #endif // PRODUCT
4186 #ifdef _LP64
4187 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4188 #else
4189 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4190 #endif // _LP64
4191
4192 // Only materialize src code for range checking when required, ignore otherwise
4193 #define IGNORE_RANGE(a, b)
4194 // Only materialize src code for contraint checking when required, ignore otherwise
4195 #define IGNORE_CONSTRAINT(func,type)
4196
4197 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4198 DECLARE_PD_DEVELOPER_FLAG, \
4199 DECLARE_PRODUCT_FLAG, \
4200 DECLARE_PD_PRODUCT_FLAG, \
4201 DECLARE_DIAGNOSTIC_FLAG, \
4202 DECLARE_EXPERIMENTAL_FLAG, \
4203 DECLARE_NOTPRODUCT_FLAG, \
4204 DECLARE_MANAGEABLE_FLAG, \
4205 DECLARE_PRODUCT_RW_FLAG, \
4206 DECLARE_LP64_PRODUCT_FLAG, \
4207 IGNORE_RANGE, \
4208 IGNORE_CONSTRAINT)
4209
4210 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4211 DECLARE_PD_DEVELOPER_FLAG, \
4212 DECLARE_PRODUCT_FLAG, \
4213 DECLARE_PD_PRODUCT_FLAG, \
4214 DECLARE_DIAGNOSTIC_FLAG, \
4215 DECLARE_NOTPRODUCT_FLAG, \
4216 IGNORE_RANGE, \
4217 IGNORE_CONSTRAINT)
4218
4219 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4220 DECLARE_PRODUCT_FLAG, \
4221 DECLARE_DIAGNOSTIC_FLAG, \
4222 DECLARE_EXPERIMENTAL_FLAG, \
4223 DECLARE_NOTPRODUCT_FLAG, \
4224 IGNORE_RANGE, \
4225 IGNORE_CONSTRAINT)
4226
4227 // Extensions
4228
4229 #include "runtime/globals_ext.hpp"
4230
4231 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP