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 // the flag can only be set only on command line during invocation of the VM
284 COMMAND_LINE_ONLY,
285 // the flag may only be set once
286 SET_ONLY_ONCE,
287 // the flag is not writable in this combination of product/debug build
288 CONSTANT,
289 // other, unspecified error related to setting the flag
290 ERR_OTHER
291 };
292
293 enum MsgType {
294 NONE = 0,
295 DIAGNOSTIC_FLAG_BUT_LOCKED,
296 EXPERIMENTAL_FLAG_BUT_LOCKED,
297 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
298 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
299 };
300
301 const char* _type;
302 const char* _name;
303 void* _addr;
304 NOT_PRODUCT(const char* _doc;)
305 Flags _flags;
306
307 // points to all Flags static array
308 static Flag* flags;
309
310 // number of flags
311 static size_t numFlags;
312
313 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
314 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
315 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
316
317 static const char* get_int_default_range_str();
318 static const char* get_uint_default_range_str();
319 static const char* get_intx_default_range_str();
320 static const char* get_uintx_default_range_str();
321 static const char* get_uint64_t_default_range_str();
322 static const char* get_size_t_default_range_str();
323 static const char* get_double_default_range_str();
324
325 Flag::Error check_writable(bool changed);
326
327 bool is_bool() const;
328 bool get_bool() const;
329 Flag::Error set_bool(bool value);
330
331 bool is_int() const;
332 int get_int() const;
333 Flag::Error set_int(int value);
334
335 bool is_uint() const;
336 uint get_uint() const;
337 Flag::Error set_uint(uint value);
338
339 bool is_intx() const;
340 intx get_intx() const;
341 Flag::Error set_intx(intx value);
342
343 bool is_uintx() const;
344 uintx get_uintx() const;
345 Flag::Error set_uintx(uintx value);
346
347 bool is_uint64_t() const;
348 uint64_t get_uint64_t() const;
349 Flag::Error set_uint64_t(uint64_t value);
350
351 bool is_size_t() const;
352 size_t get_size_t() const;
353 Flag::Error set_size_t(size_t value);
354
355 bool is_double() const;
356 double get_double() const;
357 Flag::Error set_double(double value);
358
359 bool is_ccstr() const;
360 bool ccstr_accumulates() const;
361 ccstr get_ccstr() const;
362 Flag::Error set_ccstr(ccstr value);
363
364 Flags get_origin();
365 void set_origin(Flags origin);
366
367 bool is_default();
368 bool is_ergonomic();
369 bool is_command_line();
370
371 bool is_product() const;
372 bool is_manageable() const;
373 bool is_diagnostic() const;
374 bool is_experimental() const;
375 bool is_notproduct() const;
376 bool is_develop() const;
377 bool is_read_write() const;
378 bool is_commercial() const;
379
380 bool is_constant_in_binary() const;
381
382 bool is_unlocker() const;
383 bool is_unlocked() const;
384 bool is_writeable() const;
385 bool is_external() const;
386
387 bool is_unlocker_ext() const;
388 bool is_unlocked_ext() const;
389 bool is_writeable_ext() const;
390 bool is_external_ext() const;
391
392 void unlock_diagnostic();
393
394 Flag::MsgType get_locked_message(char*, int) const;
395 void get_locked_message_ext(char*, int) const;
396
397 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
398 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
399 void print_kind(outputStream* st);
400 void print_as_flag(outputStream* st);
401
402 static const char* flag_error_str(Flag::Error error);
403 };
404
405 // debug flags control various aspects of the VM and are global accessible
406
407 // use FlagSetting to temporarily change some debug flag
408 // e.g. FlagSetting fs(DebugThisAndThat, true);
409 // restored to previous value upon leaving scope
410 class FlagSetting {
411 bool val;
412 bool* flag;
413 public:
414 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
415 ~FlagSetting() { *flag = val; }
416 };
417
418
419 class CounterSetting {
420 intx* counter;
421 public:
422 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
423 ~CounterSetting() { (*counter)--; }
424 };
425
426 class IntFlagSetting {
427 int val;
428 int* flag;
429 public:
430 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
431 ~IntFlagSetting() { *flag = val; }
432 };
433
434 class UIntFlagSetting {
435 uint val;
436 uint* flag;
437 public:
438 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
439 ~UIntFlagSetting() { *flag = val; }
440 };
441
442 class UIntXFlagSetting {
443 uintx val;
444 uintx* flag;
445 public:
446 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
447 ~UIntXFlagSetting() { *flag = val; }
448 };
449
450 class DoubleFlagSetting {
451 double val;
452 double* flag;
453 public:
454 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
455 ~DoubleFlagSetting() { *flag = val; }
456 };
457
458 class SizeTFlagSetting {
459 size_t val;
460 size_t* flag;
461 public:
462 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
463 ~SizeTFlagSetting() { *flag = val; }
464 };
465
466
467 class CommandLineFlags {
468 public:
469 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
470 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); }
471 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
472 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
473 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
474
475 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
476 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); }
477 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
478 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
479 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
480
481 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
482 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); }
483 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
484 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
485 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
486
487 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
488 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); }
489 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
490 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
491 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
492
493 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
494 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); }
495 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
496 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
497 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
498
499 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
500 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); }
501 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
502 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
503 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
504
505 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
506 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); }
507 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
508 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
509 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
510
511 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
512 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); }
513 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
514 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
515 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
516
517 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
518 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); }
519 // Contract: Flag will make private copy of the incoming value.
520 // Outgoing value is always malloc-ed, and caller MUST call free.
521 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
522 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
523
524 // Returns false if name is not a command line flag.
525 static bool wasSetOnCmdline(const char* name, bool* value);
526 static void printSetFlags(outputStream* out);
527
528 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
529 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
530
531 static void verify() PRODUCT_RETURN;
532 };
533
534 // use this for flags that are true by default in the debug version but
535 // false in the optimized version, and vice versa
536 #ifdef ASSERT
537 #define trueInDebug true
538 #define falseInDebug false
539 #else
540 #define trueInDebug false
541 #define falseInDebug true
542 #endif
543
544 // use this for flags that are true per default in the product build
545 // but false in development builds, and vice versa
546 #ifdef PRODUCT
547 #define trueInProduct true
548 #define falseInProduct false
549 #else
550 #define trueInProduct false
551 #define falseInProduct true
552 #endif
553
554 #ifdef JAVASE_EMBEDDED
555 #define falseInEmbedded false
556 #else
557 #define falseInEmbedded true
558 #endif
559
560 // develop flags are settable / visible only during development and are constant in the PRODUCT version
561 // product flags are always settable / visible
562 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
563
564 // A flag must be declared with one of the following types:
565 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
566 // The type "ccstr" is an alias for "const char*" and is used
567 // only in this file, because the macrology requires single-token type names.
568
569 // Note: Diagnostic options not meant for VM tuning or for product modes.
570 // They are to be used for VM quality assurance or field diagnosis
571 // of VM bugs. They are hidden so that users will not be encouraged to
572 // try them as if they were VM ordinary execution options. However, they
573 // are available in the product version of the VM. Under instruction
574 // from support engineers, VM customers can turn them on to collect
575 // diagnostic information about VM problems. To use a VM diagnostic
576 // option, you must first specify +UnlockDiagnosticVMOptions.
577 // (This master switch also affects the behavior of -Xprintflags.)
578 //
579 // experimental flags are in support of features that are not
580 // part of the officially supported product, but are available
581 // for experimenting with. They could, for example, be performance
582 // features that may not have undergone full or rigorous QA, but which may
583 // help performance in some cases and released for experimentation
584 // by the community of users and developers. This flag also allows one to
585 // be able to build a fully supported product that nonetheless also
586 // ships with some unsupported, lightly tested, experimental features.
587 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
588 // UnlockExperimentalVMOptions flag, which allows the control and
589 // modification of the experimental flags.
590 //
591 // Nota bene: neither diagnostic nor experimental options should be used casually,
592 // and they are not supported on production loads, except under explicit
593 // direction from support engineers.
594 //
595 // manageable flags are writeable external product flags.
596 // They are dynamically writeable through the JDK management interface
597 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
598 // These flags are external exported interface (see CCC). The list of
599 // manageable flags can be queried programmatically through the management
600 // interface.
601 //
602 // A flag can be made as "manageable" only if
603 // - the flag is defined in a CCC as an external exported interface.
604 // - the VM implementation supports dynamic setting of the flag.
605 // This implies that the VM must *always* query the flag variable
606 // and not reuse state related to the flag state at any given time.
607 // - you want the flag to be queried programmatically by the customers.
608 //
609 // product_rw flags are writeable internal product flags.
610 // They are like "manageable" flags but for internal/private use.
611 // The list of product_rw flags are internal/private flags which
612 // may be changed/removed in a future release. It can be set
613 // through the management interface to get/set value
614 // when the name of flag is supplied.
615 //
616 // A flag can be made as "product_rw" only if
617 // - the VM implementation supports dynamic setting of the flag.
618 // This implies that the VM must *always* query the flag variable
619 // and not reuse state related to the flag state at any given time.
620 //
621 // Note that when there is a need to support develop flags to be writeable,
622 // it can be done in the same way as product_rw.
623 //
624 // range is a macro that will expand to min and max arguments for range
625 // checking code if provided - see commandLineFlagRangeList.hpp
626 //
627 // constraint is a macro that will expand to custom function call
628 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
629 //
630 // writeable is a macro that controls if and how the value can change during the runtime
631 //
632 // writeable(Always) is optional and allows the flag to have its value changed
633 // without any limitations at any time
634 //
635 // writeable(Once) flag value's can be only set once during the lifetime of VM
636 //
637 // writeable(CommandLineOnly) flag value's can be only set from command line
638 // (multiple times allowed)
639 //
640
641
642 #define RUNTIME_FLAGS(develop, \
643 develop_pd, \
644 product, \
645 product_pd, \
646 diagnostic, \
647 experimental, \
648 notproduct, \
649 manageable, \
650 product_rw, \
651 lp64_product, \
652 range, \
653 constraint, \
654 writeable) \
655 \
656 lp64_product(bool, UseCompressedOops, false, \
657 "Use 32-bit object references in 64-bit VM. " \
658 "lp64_product means flag is always constant in 32 bit VM") \
659 \
660 lp64_product(bool, UseCompressedClassPointers, false, \
661 "Use 32-bit class pointers in 64-bit VM. " \
662 "lp64_product means flag is always constant in 32 bit VM") \
663 \
664 notproduct(bool, CheckCompressedOops, true, \
665 "Generate checks in encoding/decoding code in debug VM") \
666 \
667 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
668 "Heap allocation steps through preferred address regions to find" \
669 " where it can allocate the heap. Number of steps to take per " \
670 "region.") \
671 range(1, max_uintx) \
672 \
673 lp64_product(intx, ObjectAlignmentInBytes, 8, \
674 "Default object alignment in bytes, 8 is minimum") \
675 range(8, 256) \
676 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
677 \
678 product(bool, AssumeMP, false, \
679 "Instruct the VM to assume multiple processors are available") \
680 \
681 /* UseMembar is theoretically a temp flag used for memory barrier */ \
682 /* removal testing. It was supposed to be removed before FCS but has */ \
683 /* been re-added (see 6401008) */ \
684 product_pd(bool, UseMembar, \
685 "(Unstable) Issues membars on thread state transitions") \
686 \
687 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
688 "Clean the chunk pool asynchronously") \
689 \
690 experimental(bool, AlwaysSafeConstructors, false, \
691 "Force safe construction, as if all fields are final.") \
692 \
693 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
694 "Enable normal processing of flags relating to field diagnostics")\
695 \
696 experimental(bool, UnlockExperimentalVMOptions, false, \
697 "Enable normal processing of flags relating to experimental " \
698 "features") \
699 \
700 product(bool, JavaMonitorsInStackTrace, true, \
701 "Print information about Java monitor locks when the stacks are" \
702 "dumped") \
703 \
704 product_pd(bool, UseLargePages, \
705 "Use large page memory") \
706 \
707 product_pd(bool, UseLargePagesIndividualAllocation, \
708 "Allocate large pages individually for better affinity") \
709 \
710 develop(bool, LargePagesIndividualAllocationInjectError, false, \
711 "Fail large pages individual allocation") \
712 \
713 product(bool, UseLargePagesInMetaspace, false, \
714 "Use large page memory in metaspace. " \
715 "Only used if UseLargePages is enabled.") \
716 \
717 product(bool, UseNUMA, false, \
718 "Use NUMA if available") \
719 \
720 product(bool, UseNUMAInterleaving, false, \
721 "Interleave memory across NUMA nodes if available") \
722 \
723 product(size_t, NUMAInterleaveGranularity, 2*M, \
724 "Granularity to use for NUMA interleaving on Windows OS") \
725 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
726 \
727 product(bool, ForceNUMA, false, \
728 "Force NUMA optimizations on single-node/UMA systems") \
729 \
730 product(uintx, NUMAChunkResizeWeight, 20, \
731 "Percentage (0-100) used to weight the current sample when " \
732 "computing exponentially decaying average for " \
733 "AdaptiveNUMAChunkSizing") \
734 range(0, 100) \
735 \
736 product(size_t, NUMASpaceResizeRate, 1*G, \
737 "Do not reallocate more than this amount per collection") \
738 range(0, max_uintx) \
739 \
740 product(bool, UseAdaptiveNUMAChunkSizing, true, \
741 "Enable adaptive chunk sizing for NUMA") \
742 \
743 product(bool, NUMAStats, false, \
744 "Print NUMA stats in detailed heap information") \
745 \
746 product(uintx, NUMAPageScanRate, 256, \
747 "Maximum number of pages to include in the page scan procedure") \
748 range(0, max_uintx) \
749 \
750 product_pd(bool, NeedsDeoptSuspend, \
751 "True for register window machines (sparc/ia64)") \
752 \
753 product(intx, UseSSE, 99, \
754 "Highest supported SSE instructions set on x86/x64") \
755 range(0, 99) \
756 \
757 product(bool, UseAES, false, \
758 "Control whether AES instructions can be used on x86/x64") \
759 \
760 product(bool, UseSHA, false, \
761 "Control whether SHA instructions can be used " \
762 "on SPARC, on ARM and on x86") \
763 \
764 diagnostic(bool, UseGHASHIntrinsics, false, \
765 "Use intrinsics for GHASH versions of crypto") \
766 \
767 product(size_t, LargePageSizeInBytes, 0, \
768 "Large page size (0 to let VM choose the page size)") \
769 range(0, max_uintx) \
770 \
771 product(size_t, LargePageHeapSizeThreshold, 128*M, \
772 "Use large pages if maximum heap is at least this big") \
773 range(0, max_uintx) \
774 \
775 product(bool, ForceTimeHighResolution, false, \
776 "Using high time resolution (for Win32 only)") \
777 \
778 develop(bool, TracePcPatching, false, \
779 "Trace usage of frame::patch_pc") \
780 \
781 develop(bool, TraceJumps, false, \
782 "Trace assembly jumps in thread ring buffer") \
783 \
784 develop(bool, TraceRelocator, false, \
785 "Trace the bytecode relocator") \
786 \
787 develop(bool, TraceLongCompiles, false, \
788 "Print out every time compilation is longer than " \
789 "a given threshold") \
790 \
791 develop(bool, SafepointALot, false, \
792 "Generate a lot of safepoints. This works with " \
793 "GuaranteedSafepointInterval") \
794 \
795 product_pd(bool, BackgroundCompilation, \
796 "A thread requesting compilation is not blocked during " \
797 "compilation") \
798 \
799 product(bool, PrintVMQWaitTime, false, \
800 "Print out the waiting time in VM operation queue") \
801 \
802 develop(bool, TraceOopMapGeneration, false, \
803 "Show OopMapGeneration") \
804 \
805 product(bool, MethodFlushing, true, \
806 "Reclamation of zombie and not-entrant methods") \
807 \
808 develop(bool, VerifyStack, false, \
809 "Verify stack of each thread when it is entering a runtime call") \
810 \
811 diagnostic(bool, ForceUnreachable, false, \
812 "Make all non code cache addresses to be unreachable by " \
813 "forcing use of 64bit literal fixups") \
814 \
815 notproduct(bool, StressDerivedPointers, false, \
816 "Force scavenge when a derived pointer is detected on stack " \
817 "after rtm call") \
818 \
819 develop(bool, TraceDerivedPointers, false, \
820 "Trace traversal of derived pointers on stack") \
821 \
822 notproduct(bool, TraceCodeBlobStacks, false, \
823 "Trace stack-walk of codeblobs") \
824 \
825 product(bool, PrintJNIResolving, false, \
826 "Used to implement -v:jni") \
827 \
828 notproduct(bool, PrintRewrites, false, \
829 "Print methods that are being rewritten") \
830 \
831 product(bool, UseInlineCaches, true, \
832 "Use Inline Caches for virtual calls ") \
833 \
834 diagnostic(bool, InlineArrayCopy, true, \
835 "Inline arraycopy native that is known to be part of " \
836 "base library DLL") \
837 \
838 diagnostic(bool, InlineObjectHash, true, \
839 "Inline Object::hashCode() native that is known to be part " \
840 "of base library DLL") \
841 \
842 diagnostic(bool, InlineNatives, true, \
843 "Inline natives that are known to be part of base library DLL") \
844 \
845 diagnostic(bool, InlineMathNatives, true, \
846 "Inline SinD, CosD, etc.") \
847 \
848 diagnostic(bool, InlineClassNatives, true, \
849 "Inline Class.isInstance, etc") \
850 \
851 diagnostic(bool, InlineThreadNatives, true, \
852 "Inline Thread.currentThread, etc") \
853 \
854 diagnostic(bool, InlineUnsafeOps, true, \
855 "Inline memory ops (native methods) from Unsafe") \
856 \
857 product(bool, CriticalJNINatives, true, \
858 "Check for critical JNI entry points") \
859 \
860 notproduct(bool, StressCriticalJNINatives, false, \
861 "Exercise register saving code in critical natives") \
862 \
863 diagnostic(bool, UseAESIntrinsics, false, \
864 "Use intrinsics for AES versions of crypto") \
865 \
866 diagnostic(bool, UseAESCTRIntrinsics, false, \
867 "Use intrinsics for the paralleled version of AES/CTR crypto") \
868 \
869 diagnostic(bool, UseSHA1Intrinsics, false, \
870 "Use intrinsics for SHA-1 crypto hash function. " \
871 "Requires that UseSHA is enabled.") \
872 \
873 diagnostic(bool, UseSHA256Intrinsics, false, \
874 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
875 "Requires that UseSHA is enabled.") \
876 \
877 diagnostic(bool, UseSHA512Intrinsics, false, \
878 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
879 "Requires that UseSHA is enabled.") \
880 \
881 diagnostic(bool, UseCRC32Intrinsics, false, \
882 "use intrinsics for java.util.zip.CRC32") \
883 \
884 diagnostic(bool, UseCRC32CIntrinsics, false, \
885 "use intrinsics for java.util.zip.CRC32C") \
886 \
887 diagnostic(bool, UseAdler32Intrinsics, false, \
888 "use intrinsics for java.util.zip.Adler32") \
889 \
890 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
891 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
892 \
893 diagnostic(ccstrlist, DisableIntrinsic, "", \
894 "do not expand intrinsics whose (internal) names appear here") \
895 \
896 develop(bool, TraceCallFixup, false, \
897 "Trace all call fixups") \
898 \
899 develop(bool, DeoptimizeALot, false, \
900 "Deoptimize at every exit from the runtime system") \
901 \
902 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
903 "A comma separated list of bcis to deoptimize at") \
904 \
905 product(bool, DeoptimizeRandom, false, \
906 "Deoptimize random frames on random exit from the runtime system")\
907 \
908 notproduct(bool, ZombieALot, false, \
909 "Create zombies (non-entrant) at exit from the runtime system") \
910 \
911 product(bool, UnlinkSymbolsALot, false, \
912 "Unlink unreferenced symbols from the symbol table at safepoints")\
913 \
914 notproduct(bool, WalkStackALot, false, \
915 "Trace stack (no print) at every exit from the runtime system") \
916 \
917 product(bool, Debugging, false, \
918 "Set when executing debug methods in debug.cpp " \
919 "(to prevent triggering assertions)") \
920 \
921 notproduct(bool, StrictSafepointChecks, trueInDebug, \
922 "Enable strict checks that safepoints cannot happen for threads " \
923 "that use NoSafepointVerifier") \
924 \
925 notproduct(bool, VerifyLastFrame, false, \
926 "Verify oops on last frame on entry to VM") \
927 \
928 product(bool, FailOverToOldVerifier, true, \
929 "Fail over to old verifier when split verifier fails") \
930 \
931 develop(bool, ShowSafepointMsgs, false, \
932 "Show message about safepoint synchronization") \
933 \
934 product(bool, SafepointTimeout, false, \
935 "Time out and warn or fail after SafepointTimeoutDelay " \
936 "milliseconds if failed to reach safepoint") \
937 \
938 develop(bool, DieOnSafepointTimeout, false, \
939 "Die upon failure to reach safepoint (see SafepointTimeout)") \
940 \
941 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
942 /* typically, at most a few retries are needed */ \
943 product(intx, SuspendRetryCount, 50, \
944 "Maximum retry count for an external suspend request") \
945 range(0, max_intx) \
946 \
947 product(intx, SuspendRetryDelay, 5, \
948 "Milliseconds to delay per retry (* current_retry_count)") \
949 range(0, max_intx) \
950 \
951 product(bool, AssertOnSuspendWaitFailure, false, \
952 "Assert/Guarantee on external suspend wait failure") \
953 \
954 product(bool, TraceSuspendWaitFailures, false, \
955 "Trace external suspend wait failures") \
956 \
957 product(bool, MaxFDLimit, true, \
958 "Bump the number of file descriptors to maximum in Solaris") \
959 \
960 diagnostic(bool, LogEvents, true, \
961 "Enable the various ring buffer event logs") \
962 \
963 diagnostic(uintx, LogEventsBufferEntries, 10, \
964 "Number of ring buffer event logs") \
965 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
966 \
967 product(bool, BytecodeVerificationRemote, true, \
968 "Enable the Java bytecode verifier for remote classes") \
969 \
970 product(bool, BytecodeVerificationLocal, false, \
971 "Enable the Java bytecode verifier for local classes") \
972 \
973 develop(bool, ForceFloatExceptions, trueInDebug, \
974 "Force exceptions on FP stack under/overflow") \
975 \
976 develop(bool, VerifyStackAtCalls, false, \
977 "Verify that the stack pointer is unchanged after calls") \
978 \
979 develop(bool, TraceJavaAssertions, false, \
980 "Trace java language assertions") \
981 \
982 notproduct(bool, CheckAssertionStatusDirectives, false, \
983 "Temporary - see javaClasses.cpp") \
984 \
985 notproduct(bool, PrintMallocFree, false, \
986 "Trace calls to C heap malloc/free allocation") \
987 \
988 notproduct(bool, VerifyCodeCache, false, \
989 "Verify code cache on memory allocation/deallocation") \
990 \
991 develop(bool, UseMallocOnly, false, \
992 "Use only malloc/free for allocation (no resource area/arena)") \
993 \
994 develop(bool, PrintMalloc, false, \
995 "Print all malloc/free calls") \
996 \
997 develop(bool, PrintMallocStatistics, false, \
998 "Print malloc/free statistics") \
999 \
1000 develop(bool, ZapResourceArea, trueInDebug, \
1001 "Zap freed resource/arena space with 0xABABABAB") \
1002 \
1003 notproduct(bool, ZapVMHandleArea, trueInDebug, \
1004 "Zap freed VM handle space with 0xBCBCBCBC") \
1005 \
1006 develop(bool, ZapJNIHandleArea, trueInDebug, \
1007 "Zap freed JNI handle space with 0xFEFEFEFE") \
1008 \
1009 notproduct(bool, ZapStackSegments, trueInDebug, \
1010 "Zap allocated/freed stack segments with 0xFADFADED") \
1011 \
1012 develop(bool, ZapUnusedHeapArea, trueInDebug, \
1013 "Zap unused heap space with 0xBAADBABE") \
1014 \
1015 develop(bool, CheckZapUnusedHeapArea, false, \
1016 "Check zapping of unused heap space") \
1017 \
1018 develop(bool, ZapFillerObjects, trueInDebug, \
1019 "Zap filler objects with 0xDEAFBABE") \
1020 \
1021 develop(bool, PrintVMMessages, true, \
1022 "Print VM messages on console") \
1023 \
1024 notproduct(uintx, ErrorHandlerTest, 0, \
1025 "If > 0, provokes an error after VM initialization; the value " \
1026 "determines which error to provoke. See test_error_handler() " \
1027 "in debug.cpp.") \
1028 \
1029 notproduct(uintx, TestCrashInErrorHandler, 0, \
1030 "If > 0, provokes an error inside VM error handler (a secondary " \
1031 "crash). see test_error_handler() in debug.cpp.") \
1032 \
1033 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1034 "If true, tests SafeFetch inside error handler.") \
1035 \
1036 develop(bool, Verbose, false, \
1037 "Print additional debugging information from other modes") \
1038 \
1039 develop(bool, PrintMiscellaneous, false, \
1040 "Print uncategorized debugging information (requires +Verbose)") \
1041 \
1042 develop(bool, WizardMode, false, \
1043 "Print much more debugging information") \
1044 \
1045 product(bool, ShowMessageBoxOnError, false, \
1046 "Keep process alive on VM fatal error") \
1047 \
1048 product(bool, CreateCoredumpOnCrash, true, \
1049 "Create core/mini dump on VM fatal error") \
1050 \
1051 product(uint64_t, ErrorLogTimeout, 2 * 60, \
1052 "Timeout, in seconds, to limit the time spent on writing an " \
1053 "error log in case of a crash.") \
1054 range(0, (uint64_t)max_jlong/1000) \
1055 \
1056 product_pd(bool, UseOSErrorReporting, \
1057 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1058 \
1059 product(bool, SuppressFatalErrorMessage, false, \
1060 "Report NO fatal error message (avoid deadlock)") \
1061 \
1062 product(ccstrlist, OnError, "", \
1063 "Run user-defined commands on fatal error; see VMError.cpp " \
1064 "for examples") \
1065 \
1066 product(ccstrlist, OnOutOfMemoryError, "", \
1067 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1068 \
1069 manageable(bool, HeapDumpBeforeFullGC, false, \
1070 "Dump heap to file before any major stop-the-world GC") \
1071 \
1072 manageable(bool, HeapDumpAfterFullGC, false, \
1073 "Dump heap to file after any major stop-the-world GC") \
1074 \
1075 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1076 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1077 \
1078 manageable(ccstr, HeapDumpPath, NULL, \
1079 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1080 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1081 "in the working directory)") \
1082 \
1083 develop(bool, BreakAtWarning, false, \
1084 "Execute breakpoint upon encountering VM warning") \
1085 \
1086 develop(bool, UseFakeTimers, false, \
1087 "Tell whether the VM should use system time or a fake timer") \
1088 \
1089 product(ccstr, NativeMemoryTracking, "off", \
1090 "Native memory tracking options") \
1091 \
1092 diagnostic(bool, PrintNMTStatistics, false, \
1093 "Print native memory tracking summary data if it is on") \
1094 \
1095 diagnostic(bool, LogCompilation, false, \
1096 "Log compilation activity in detail to LogFile") \
1097 \
1098 product(bool, PrintCompilation, false, \
1099 "Print compilations") \
1100 \
1101 diagnostic(bool, TraceNMethodInstalls, false, \
1102 "Trace nmethod installation") \
1103 \
1104 diagnostic(intx, ScavengeRootsInCode, 2, \
1105 "0: do not allow scavengable oops in the code cache; " \
1106 "1: allow scavenging from the code cache; " \
1107 "2: emit as many constants as the compiler can see") \
1108 range(0, 2) \
1109 \
1110 product(bool, AlwaysRestoreFPU, false, \
1111 "Restore the FPU control word after every JNI call (expensive)") \
1112 \
1113 diagnostic(bool, PrintCompilation2, false, \
1114 "Print additional statistics per compilation") \
1115 \
1116 diagnostic(bool, PrintAdapterHandlers, false, \
1117 "Print code generated for i2c/c2i adapters") \
1118 \
1119 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1120 "Verify that i2c/c2i adapters are called properly") \
1121 \
1122 develop(bool, VerifyAdapterSharing, false, \
1123 "Verify that the code for shared adapters is the equivalent") \
1124 \
1125 diagnostic(bool, PrintAssembly, false, \
1126 "Print assembly code (using external disassembler.so)") \
1127 \
1128 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1129 "Print options string passed to disassembler.so") \
1130 \
1131 notproduct(bool, PrintNMethodStatistics, false, \
1132 "Print a summary statistic for the generated nmethods") \
1133 \
1134 diagnostic(bool, PrintNMethods, false, \
1135 "Print assembly code for nmethods when generated") \
1136 \
1137 diagnostic(bool, PrintNativeNMethods, false, \
1138 "Print assembly code for native nmethods when generated") \
1139 \
1140 develop(bool, PrintDebugInfo, false, \
1141 "Print debug information for all nmethods when generated") \
1142 \
1143 develop(bool, PrintRelocations, false, \
1144 "Print relocation information for all nmethods when generated") \
1145 \
1146 develop(bool, PrintDependencies, false, \
1147 "Print dependency information for all nmethods when generated") \
1148 \
1149 develop(bool, PrintExceptionHandlers, false, \
1150 "Print exception handler tables for all nmethods when generated") \
1151 \
1152 develop(bool, StressCompiledExceptionHandlers, false, \
1153 "Exercise compiled exception handlers") \
1154 \
1155 develop(bool, InterceptOSException, false, \
1156 "Start debugger when an implicit OS (e.g. NULL) " \
1157 "exception happens") \
1158 \
1159 product(bool, PrintCodeCache, false, \
1160 "Print the code cache memory usage when exiting") \
1161 \
1162 develop(bool, PrintCodeCache2, false, \
1163 "Print detailed usage information on the code cache when exiting")\
1164 \
1165 product(bool, PrintCodeCacheOnCompilation, false, \
1166 "Print the code cache memory usage each time a method is " \
1167 "compiled") \
1168 \
1169 diagnostic(bool, PrintStubCode, false, \
1170 "Print generated stub code") \
1171 \
1172 product(bool, StackTraceInThrowable, true, \
1173 "Collect backtrace in throwable when exception happens") \
1174 \
1175 product(bool, OmitStackTraceInFastThrow, true, \
1176 "Omit backtraces for some 'hot' exceptions in optimized code") \
1177 \
1178 product(bool, ProfilerPrintByteCodeStatistics, false, \
1179 "Print bytecode statistics when dumping profiler output") \
1180 \
1181 product(bool, ProfilerRecordPC, false, \
1182 "Collect ticks for each 16 byte interval of compiled code") \
1183 \
1184 product(bool, ProfileVM, false, \
1185 "Profile ticks that fall within VM (either in the VM Thread " \
1186 "or VM code called through stubs)") \
1187 \
1188 product(bool, ProfileIntervals, false, \
1189 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1190 \
1191 notproduct(bool, ProfilerCheckIntervals, false, \
1192 "Collect and print information on spacing of profiler ticks") \
1193 \
1194 product(bool, PrintWarnings, true, \
1195 "Print JVM warnings to output stream") \
1196 \
1197 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1198 "Print warnings for stalled SpinLocks") \
1199 \
1200 product(bool, RegisterFinalizersAtInit, true, \
1201 "Register finalizable objects at end of Object.<init> or " \
1202 "after allocation") \
1203 \
1204 develop(bool, RegisterReferences, true, \
1205 "Tell whether the VM should register soft/weak/final/phantom " \
1206 "references") \
1207 \
1208 develop(bool, IgnoreRewrites, false, \
1209 "Suppress rewrites of bytecodes in the oopmap generator. " \
1210 "This is unsafe!") \
1211 \
1212 develop(bool, PrintCodeCacheExtension, false, \
1213 "Print extension of code cache") \
1214 \
1215 develop(bool, UsePrivilegedStack, true, \
1216 "Enable the security JVM functions") \
1217 \
1218 develop(bool, ProtectionDomainVerification, true, \
1219 "Verify protection domain before resolution in system dictionary")\
1220 \
1221 product(bool, ClassUnloading, true, \
1222 "Do unloading of classes") \
1223 \
1224 product(bool, ClassUnloadingWithConcurrentMark, true, \
1225 "Do unloading of classes with a concurrent marking cycle") \
1226 \
1227 develop(bool, DisableStartThread, false, \
1228 "Disable starting of additional Java threads " \
1229 "(for debugging only)") \
1230 \
1231 develop(bool, MemProfiling, false, \
1232 "Write memory usage profiling to log file") \
1233 \
1234 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1235 "Print the system dictionary at exit") \
1236 \
1237 experimental(intx, PredictedLoadedClassCount, 0, \
1238 "Experimental: Tune loaded class cache starting size") \
1239 \
1240 diagnostic(bool, UnsyncloadClass, false, \
1241 "Unstable: VM calls loadClass unsynchronized. Custom " \
1242 "class loader must call VM synchronized for findClass " \
1243 "and defineClass.") \
1244 \
1245 product(bool, AlwaysLockClassLoader, false, \
1246 "Require the VM to acquire the class loader lock before calling " \
1247 "loadClass() even for class loaders registering " \
1248 "as parallel capable") \
1249 \
1250 product(bool, AllowParallelDefineClass, false, \
1251 "Allow parallel defineClass requests for class loaders " \
1252 "registering as parallel capable") \
1253 \
1254 product(bool, MustCallLoadClassInternal, false, \
1255 "Call loadClassInternal() rather than loadClass()") \
1256 \
1257 product_pd(bool, DontYieldALot, \
1258 "Throw away obvious excess yield calls") \
1259 \
1260 product(bool, ConvertSleepToYield, true, \
1261 "Convert sleep(0) to thread yield ") \
1262 \
1263 product(bool, ConvertYieldToSleep, false, \
1264 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1265 "behavior") \
1266 \
1267 develop(bool, UseDetachedThreads, true, \
1268 "Use detached threads that are recycled upon termination " \
1269 "(for Solaris only)") \
1270 \
1271 product(bool, UseLWPSynchronization, true, \
1272 "Use LWP-based instead of libthread-based synchronization " \
1273 "(SPARC only)") \
1274 \
1275 experimental(ccstr, SyncKnobs, NULL, \
1276 "(Unstable) Various monitor synchronization tunables") \
1277 \
1278 experimental(intx, EmitSync, 0, \
1279 "(Unsafe, Unstable) " \
1280 "Control emission of inline sync fast-path code") \
1281 \
1282 product(intx, MonitorBound, 0, "Bound Monitor population") \
1283 range(0, max_jint) \
1284 \
1285 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \
1286 \
1287 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1288 "Experimental Sync flags") \
1289 \
1290 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1291 \
1292 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1293 \
1294 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1295 \
1296 experimental(intx, hashCode, 5, \
1297 "(Unstable) select hashCode generation algorithm") \
1298 \
1299 product(bool, FilterSpuriousWakeups, true, \
1300 "When true prevents OS-level spurious, or premature, wakeups " \
1301 "from Object.wait (Ignored for Windows)") \
1302 \
1303 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1304 \
1305 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1306 \
1307 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1308 \
1309 develop(bool, UsePthreads, false, \
1310 "Use pthread-based instead of libthread-based synchronization " \
1311 "(SPARC only)") \
1312 \
1313 product(bool, ReduceSignalUsage, false, \
1314 "Reduce the use of OS signals in Java and/or the VM") \
1315 \
1316 develop_pd(bool, ShareVtableStubs, \
1317 "Share vtable stubs (smaller code but worse branch prediction") \
1318 \
1319 develop(bool, LoadLineNumberTables, true, \
1320 "Tell whether the class file parser loads line number tables") \
1321 \
1322 develop(bool, LoadLocalVariableTables, true, \
1323 "Tell whether the class file parser loads local variable tables") \
1324 \
1325 develop(bool, LoadLocalVariableTypeTables, true, \
1326 "Tell whether the class file parser loads local variable type" \
1327 "tables") \
1328 \
1329 product(bool, AllowUserSignalHandlers, false, \
1330 "Do not complain if the application installs signal handlers " \
1331 "(Solaris & Linux only)") \
1332 \
1333 product(bool, UseSignalChaining, true, \
1334 "Use signal-chaining to invoke signal handlers installed " \
1335 "by the application (Solaris & Linux only)") \
1336 \
1337 product(bool, AllowJNIEnvProxy, false, \
1338 "Allow JNIEnv proxies for jdbx") \
1339 \
1340 product(bool, RestoreMXCSROnJNICalls, false, \
1341 "Restore MXCSR when returning from JNI calls") \
1342 \
1343 product(bool, CheckJNICalls, false, \
1344 "Verify all arguments to JNI calls") \
1345 \
1346 product(bool, CheckEndorsedAndExtDirs, false, \
1347 "Verify the endorsed and extension directories are not used") \
1348 \
1349 product(bool, UseFastJNIAccessors, true, \
1350 "Use optimized versions of Get<Primitive>Field") \
1351 \
1352 product(intx, MaxJNILocalCapacity, 65536, \
1353 "Maximum allowable local JNI handle capacity to " \
1354 "EnsureLocalCapacity() and PushLocalFrame(), " \
1355 "where <= 0 is unlimited, default: 65536") \
1356 range(min_intx, max_intx) \
1357 \
1358 product(bool, EagerXrunInit, false, \
1359 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1360 "but not all -Xrun libraries may support the state of the VM " \
1361 "at this time") \
1362 \
1363 product(bool, PreserveAllAnnotations, false, \
1364 "Preserve RuntimeInvisibleAnnotations as well " \
1365 "as RuntimeVisibleAnnotations") \
1366 \
1367 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1368 "Number of OutOfMemoryErrors preallocated with backtrace") \
1369 \
1370 product(bool, UseXMMForArrayCopy, false, \
1371 "Use SSE2 MOVQ instruction for Arraycopy") \
1372 \
1373 product(intx, FieldsAllocationStyle, 1, \
1374 "0 - type based with oops first, " \
1375 "1 - with oops last, " \
1376 "2 - oops in super and sub classes are together") \
1377 range(0, 2) \
1378 \
1379 product(bool, CompactFields, true, \
1380 "Allocate nonstatic fields in gaps between previous fields") \
1381 \
1382 notproduct(bool, PrintFieldLayout, false, \
1383 "Print field layout for each class") \
1384 \
1385 /* Need to limit the extent of the padding to reasonable size. */\
1386 /* 8K is well beyond the reasonable HW cache line size, even with */\
1387 /* aggressive prefetching, while still leaving the room for segregating */\
1388 /* among the distinct pages. */\
1389 product(intx, ContendedPaddingWidth, 128, \
1390 "How many bytes to pad the fields/classes marked @Contended with")\
1391 range(0, 8192) \
1392 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1393 \
1394 product(bool, EnableContended, true, \
1395 "Enable @Contended annotation support") \
1396 \
1397 product(bool, RestrictContended, true, \
1398 "Restrict @Contended to trusted classes") \
1399 \
1400 product(bool, UseBiasedLocking, true, \
1401 "Enable biased locking in JVM") \
1402 \
1403 product(intx, BiasedLockingStartupDelay, 4000, \
1404 "Number of milliseconds to wait before enabling biased locking") \
1405 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1406 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1407 \
1408 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1409 "Print statistics of biased locking in JVM") \
1410 \
1411 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1412 "Threshold of number of revocations per type to try to " \
1413 "rebias all objects in the heap of that type") \
1414 range(0, max_intx) \
1415 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1416 \
1417 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1418 "Threshold of number of revocations per type to permanently " \
1419 "revoke biases of all objects in the heap of that type") \
1420 range(0, max_intx) \
1421 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1422 \
1423 product(intx, BiasedLockingDecayTime, 25000, \
1424 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1425 "type after previous bulk rebias") \
1426 range(500, max_intx) \
1427 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1428 \
1429 product(bool, ExitOnOutOfMemoryError, false, \
1430 "JVM exits on the first occurrence of an out-of-memory error") \
1431 \
1432 product(bool, CrashOnOutOfMemoryError, false, \
1433 "JVM aborts, producing an error log and core/mini dump, on the " \
1434 "first occurrence of an out-of-memory error") \
1435 \
1436 /* tracing */ \
1437 \
1438 develop(bool, StressRewriter, false, \
1439 "Stress linktime bytecode rewriting") \
1440 \
1441 product(ccstr, TraceJVMTI, NULL, \
1442 "Trace flags for JVMTI functions and events") \
1443 \
1444 /* This option can change an EMCP method into an obsolete method. */ \
1445 /* This can affect tests that except specific methods to be EMCP. */ \
1446 /* This option should be used with caution. */ \
1447 product(bool, StressLdcRewrite, false, \
1448 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1449 \
1450 /* change to false by default sometime after Mustang */ \
1451 product(bool, VerifyMergedCPBytecodes, true, \
1452 "Verify bytecodes after RedefineClasses constant pool merging") \
1453 \
1454 develop(bool, TraceBytecodes, false, \
1455 "Trace bytecode execution") \
1456 \
1457 develop(bool, TraceICs, false, \
1458 "Trace inline cache changes") \
1459 \
1460 notproduct(bool, TraceInvocationCounterOverflow, false, \
1461 "Trace method invocation counter overflow") \
1462 \
1463 develop(bool, TraceInlineCacheClearing, false, \
1464 "Trace clearing of inline caches in nmethods") \
1465 \
1466 develop(bool, TraceDependencies, false, \
1467 "Trace dependencies") \
1468 \
1469 develop(bool, VerifyDependencies, trueInDebug, \
1470 "Exercise and verify the compilation dependency mechanism") \
1471 \
1472 develop(bool, TraceNewOopMapGeneration, false, \
1473 "Trace OopMapGeneration") \
1474 \
1475 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1476 "Trace OopMapGeneration: print detailed cell states") \
1477 \
1478 develop(bool, TimeOopMap, false, \
1479 "Time calls to GenerateOopMap::compute_map() in sum") \
1480 \
1481 develop(bool, TimeOopMap2, false, \
1482 "Time calls to GenerateOopMap::compute_map() individually") \
1483 \
1484 develop(bool, TraceOopMapRewrites, false, \
1485 "Trace rewriting of method oops during oop map generation") \
1486 \
1487 develop(bool, TraceICBuffer, false, \
1488 "Trace usage of IC buffer") \
1489 \
1490 develop(bool, TraceCompiledIC, false, \
1491 "Trace changes of compiled IC") \
1492 \
1493 /* gc */ \
1494 \
1495 product(bool, UseSerialGC, false, \
1496 "Use the Serial garbage collector") \
1497 \
1498 product(bool, UseG1GC, false, \
1499 "Use the Garbage-First garbage collector") \
1500 \
1501 product(bool, UseParallelGC, false, \
1502 "Use the Parallel Scavenge garbage collector") \
1503 \
1504 product(bool, UseParallelOldGC, false, \
1505 "Use the Parallel Old garbage collector") \
1506 \
1507 product(uintx, HeapMaximumCompactionInterval, 20, \
1508 "How often should we maximally compact the heap (not allowing " \
1509 "any dead space)") \
1510 range(0, max_uintx) \
1511 \
1512 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1513 "The collection count for the first maximum compaction") \
1514 range(0, max_uintx) \
1515 \
1516 product(bool, UseMaximumCompactionOnSystemGC, true, \
1517 "Use maximum compaction in the Parallel Old garbage collector " \
1518 "for a system GC") \
1519 \
1520 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1521 "The mean used by the parallel compact dead wood " \
1522 "limiter (a number between 0-100)") \
1523 range(0, 100) \
1524 \
1525 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1526 "The standard deviation used by the parallel compact dead wood " \
1527 "limiter (a number between 0-100)") \
1528 range(0, 100) \
1529 \
1530 product(uint, ParallelGCThreads, 0, \
1531 "Number of parallel threads parallel gc will use") \
1532 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1533 \
1534 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1535 "Use semaphore synchronization for the GC Threads, " \
1536 "instead of synchronization based on mutexes") \
1537 \
1538 product(bool, UseDynamicNumberOfGCThreads, false, \
1539 "Dynamically choose the number of parallel threads " \
1540 "parallel gc will use") \
1541 \
1542 diagnostic(bool, InjectGCWorkerCreationFailure, false, \
1543 "Inject thread creation failures for " \
1544 "UseDynamicNumberOfGCThreads") \
1545 \
1546 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1547 "Force dynamic selection of the number of " \
1548 "parallel threads parallel gc will use to aid debugging") \
1549 \
1550 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1551 "Size of heap (bytes) per GC thread used in calculating the " \
1552 "number of GC threads") \
1553 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1554 \
1555 product(uint, ConcGCThreads, 0, \
1556 "Number of threads concurrent gc will use") \
1557 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1558 \
1559 product(uintx, GCTaskTimeStampEntries, 200, \
1560 "Number of time stamp entries per gc worker thread") \
1561 range(1, max_uintx) \
1562 \
1563 product(bool, AlwaysTenure, false, \
1564 "Always tenure objects in eden (ParallelGC only)") \
1565 \
1566 product(bool, NeverTenure, false, \
1567 "Never tenure objects in eden, may tenure on overflow " \
1568 "(ParallelGC only)") \
1569 \
1570 product(bool, ScavengeBeforeFullGC, true, \
1571 "Scavenge youngest generation before each full GC.") \
1572 \
1573 product(bool, UseConcMarkSweepGC, false, \
1574 "Use Concurrent Mark-Sweep GC in the old generation") \
1575 \
1576 product(bool, ExplicitGCInvokesConcurrent, false, \
1577 "A System.gc() request invokes a concurrent collection; " \
1578 "(effective only when using concurrent collectors)") \
1579 \
1580 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1581 "A System.gc() request invokes a concurrent collection and " \
1582 "also unloads classes during such a concurrent gc cycle " \
1583 "(effective only when UseConcMarkSweepGC)") \
1584 \
1585 product(bool, GCLockerInvokesConcurrent, false, \
1586 "The exit of a JNI critical section necessitating a scavenge, " \
1587 "also kicks off a background concurrent collection") \
1588 \
1589 product(uintx, GCLockerEdenExpansionPercent, 5, \
1590 "How much the GC can expand the eden by while the GC locker " \
1591 "is active (as a percentage)") \
1592 range(0, 100) \
1593 \
1594 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1595 "Number of times to retry allocations when " \
1596 "blocked by the GC locker") \
1597 range(0, max_uintx) \
1598 \
1599 product(bool, UseCMSBestFit, true, \
1600 "Use CMS best fit allocation strategy") \
1601 \
1602 product(bool, UseParNewGC, false, \
1603 "Use parallel threads in the new generation") \
1604 \
1605 product(uintx, ParallelGCBufferWastePct, 10, \
1606 "Wasted fraction of parallel allocation buffer") \
1607 range(0, 100) \
1608 \
1609 product(uintx, TargetPLABWastePct, 10, \
1610 "Target wasted space in last buffer as percent of overall " \
1611 "allocation") \
1612 range(1, 100) \
1613 \
1614 product(uintx, PLABWeight, 75, \
1615 "Percentage (0-100) used to weight the current sample when " \
1616 "computing exponentially decaying average for ResizePLAB") \
1617 range(0, 100) \
1618 \
1619 product(bool, ResizePLAB, true, \
1620 "Dynamically resize (survivor space) promotion LAB's") \
1621 \
1622 product(int, ParGCArrayScanChunk, 50, \
1623 "Scan a subset of object array and push remainder, if array is " \
1624 "bigger than this") \
1625 range(1, max_jint/3) \
1626 \
1627 product(bool, ParGCUseLocalOverflow, false, \
1628 "Instead of a global overflow list, use local overflow stacks") \
1629 \
1630 product(bool, ParGCTrimOverflow, true, \
1631 "Eagerly trim the local overflow lists " \
1632 "(when ParGCUseLocalOverflow)") \
1633 \
1634 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1635 "Simulate work queue overflow in ParNew") \
1636 \
1637 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1638 "An `interval' counter that determines how frequently " \
1639 "we simulate overflow; a smaller number increases frequency") \
1640 \
1641 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1642 "The desired number of objects to claim from the overflow list") \
1643 range(0, max_uintx) \
1644 \
1645 diagnostic(uintx, ParGCStridesPerThread, 2, \
1646 "The number of strides per worker thread that we divide up the " \
1647 "card table scanning work into") \
1648 range(1, max_uintx) \
1649 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1650 \
1651 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1652 "The number of cards in each chunk of the parallel chunks used " \
1653 "during card table scanning") \
1654 range(1, max_intx) \
1655 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1656 \
1657 product(uintx, OldPLABWeight, 50, \
1658 "Percentage (0-100) used to weight the current sample when " \
1659 "computing exponentially decaying average for resizing " \
1660 "OldPLABSize") \
1661 range(0, 100) \
1662 \
1663 product(bool, ResizeOldPLAB, true, \
1664 "Dynamically resize (old gen) promotion LAB's") \
1665 \
1666 product(size_t, CMSOldPLABMax, 1024, \
1667 "Maximum size of CMS gen promotion LAB caches per worker " \
1668 "per block size") \
1669 range(1, max_uintx) \
1670 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1671 \
1672 product(size_t, CMSOldPLABMin, 16, \
1673 "Minimum size of CMS gen promotion LAB caches per worker " \
1674 "per block size") \
1675 range(1, max_uintx) \
1676 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1677 \
1678 product(uintx, CMSOldPLABNumRefills, 4, \
1679 "Nominal number of refills of CMS gen promotion LAB cache " \
1680 "per worker per block size") \
1681 range(1, max_uintx) \
1682 \
1683 product(bool, CMSOldPLABResizeQuicker, false, \
1684 "React on-the-fly during a scavenge to a sudden " \
1685 "change in block demand rate") \
1686 \
1687 product(uintx, CMSOldPLABToleranceFactor, 4, \
1688 "The tolerance of the phase-change detector for on-the-fly " \
1689 "PLAB resizing during a scavenge") \
1690 range(1, max_uintx) \
1691 \
1692 product(uintx, CMSOldPLABReactivityFactor, 2, \
1693 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1694 "during a scavenge") \
1695 range(1, max_uintx) \
1696 \
1697 product(bool, AlwaysPreTouch, false, \
1698 "Force all freshly committed pages to be pre-touched") \
1699 \
1700 product_pd(size_t, CMSYoungGenPerWorker, \
1701 "The maximum size of young gen chosen by default per GC worker " \
1702 "thread available") \
1703 range(1, max_uintx) \
1704 \
1705 product(uintx, CMSIncrementalSafetyFactor, 10, \
1706 "Percentage (0-100) used to add conservatism when computing the " \
1707 "duty cycle") \
1708 range(0, 100) \
1709 \
1710 product(uintx, CMSExpAvgFactor, 50, \
1711 "Percentage (0-100) used to weight the current sample when " \
1712 "computing exponential averages for CMS statistics") \
1713 range(0, 100) \
1714 \
1715 product(uintx, CMS_FLSWeight, 75, \
1716 "Percentage (0-100) used to weight the current sample when " \
1717 "computing exponentially decaying averages for CMS FLS " \
1718 "statistics") \
1719 range(0, 100) \
1720 \
1721 product(uintx, CMS_FLSPadding, 1, \
1722 "The multiple of deviation from mean to use for buffering " \
1723 "against volatility in free list demand") \
1724 range(0, max_juint) \
1725 \
1726 product(uintx, FLSCoalescePolicy, 2, \
1727 "CMS: aggressiveness level for coalescing, increasing " \
1728 "from 0 to 4") \
1729 range(0, 4) \
1730 \
1731 product(bool, FLSAlwaysCoalesceLarge, false, \
1732 "CMS: larger free blocks are always available for coalescing") \
1733 \
1734 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1735 "CMS: the smaller the percentage the greater the coalescing " \
1736 "force") \
1737 range(0.0, 1.0) \
1738 \
1739 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1740 "CMS: the factor by which to inflate estimated demand of small " \
1741 "block sizes to prevent coalescing with an adjoining block") \
1742 range(0.0, DBL_MAX) \
1743 \
1744 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1745 "CMS: the factor by which to inflate estimated demand of large " \
1746 "block sizes to prevent coalescing with an adjoining block") \
1747 range(0.0, DBL_MAX) \
1748 \
1749 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1750 "CMS: the factor by which to inflate estimated demand of small " \
1751 "block sizes to prevent splitting to supply demand for smaller " \
1752 "blocks") \
1753 range(0.0, DBL_MAX) \
1754 \
1755 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1756 "CMS: the factor by which to inflate estimated demand of large " \
1757 "block sizes to prevent splitting to supply demand for smaller " \
1758 "blocks") \
1759 range(0.0, DBL_MAX) \
1760 \
1761 product(bool, CMSExtrapolateSweep, false, \
1762 "CMS: cushion for block demand during sweep") \
1763 \
1764 product(uintx, CMS_SweepWeight, 75, \
1765 "Percentage (0-100) used to weight the current sample when " \
1766 "computing exponentially decaying average for inter-sweep " \
1767 "duration") \
1768 range(0, 100) \
1769 \
1770 product(uintx, CMS_SweepPadding, 1, \
1771 "The multiple of deviation from mean to use for buffering " \
1772 "against volatility in inter-sweep duration") \
1773 range(0, max_juint) \
1774 \
1775 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1776 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1777 "duration exceeds this threshold in milliseconds") \
1778 range(0, max_uintx) \
1779 \
1780 product(bool, CMSClassUnloadingEnabled, true, \
1781 "Whether class unloading enabled when using CMS GC") \
1782 \
1783 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1784 "When CMS class unloading is enabled, the maximum CMS cycle " \
1785 "count for which classes may not be unloaded") \
1786 range(0, max_uintx) \
1787 \
1788 product(uintx, CMSIndexedFreeListReplenish, 4, \
1789 "Replenish an indexed free list with this number of chunks") \
1790 range(1, max_uintx) \
1791 \
1792 product(bool, CMSReplenishIntermediate, true, \
1793 "Replenish all intermediate free-list caches") \
1794 \
1795 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1796 "When satisfying batched demand, split blocks from the " \
1797 "IndexedFreeList whose size is a multiple of requested size") \
1798 \
1799 product(bool, CMSLoopWarn, false, \
1800 "Warn in case of excessive CMS looping") \
1801 \
1802 /* where does the range max value of (max_jint - 1) come from? */ \
1803 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1804 "Maximum size of marking stack") \
1805 range(1, (max_jint - 1)) \
1806 \
1807 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1808 "Size of marking stack") \
1809 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1810 \
1811 notproduct(bool, CMSMarkStackOverflowALot, false, \
1812 "Simulate frequent marking stack / work queue overflow") \
1813 \
1814 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1815 "An \"interval\" counter that determines how frequently " \
1816 "to simulate overflow; a smaller number increases frequency") \
1817 \
1818 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1819 "Maximum number of abortable preclean iterations, if > 0") \
1820 range(0, max_uintx) \
1821 \
1822 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1823 "Maximum time in abortable preclean (in milliseconds)") \
1824 range(0, max_intx) \
1825 \
1826 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1827 "Nominal minimum work per abortable preclean iteration") \
1828 range(0, max_uintx) \
1829 \
1830 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1831 "Time that we sleep between iterations when not given " \
1832 "enough work per iteration") \
1833 range(0, max_intx) \
1834 \
1835 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \
1836 product(size_t, CMSRescanMultiple, 32, \
1837 "Size (in cards) of CMS parallel rescan task") \
1838 range(1, SIZE_MAX / 4096) \
1839 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \
1840 \
1841 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \
1842 product(size_t, CMSConcMarkMultiple, 32, \
1843 "Size (in cards) of CMS concurrent MT marking task") \
1844 range(1, SIZE_MAX / 4096) \
1845 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \
1846 \
1847 product(bool, CMSAbortSemantics, false, \
1848 "Whether abort-on-overflow semantics is implemented") \
1849 \
1850 product(bool, CMSParallelInitialMarkEnabled, true, \
1851 "Use the parallel initial mark.") \
1852 \
1853 product(bool, CMSParallelRemarkEnabled, true, \
1854 "Whether parallel remark enabled (only if ParNewGC)") \
1855 \
1856 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1857 "Whether parallel remark of survivor space " \
1858 "enabled (effective only if CMSParallelRemarkEnabled)") \
1859 \
1860 product(bool, CMSPLABRecordAlways, true, \
1861 "Always record survivor space PLAB boundaries (effective only " \
1862 "if CMSParallelSurvivorRemarkEnabled)") \
1863 \
1864 product(bool, CMSEdenChunksRecordAlways, true, \
1865 "Always record eden chunks used for the parallel initial mark " \
1866 "or remark of eden") \
1867 \
1868 product(bool, CMSConcurrentMTEnabled, true, \
1869 "Whether multi-threaded concurrent work enabled " \
1870 "(effective only if ParNewGC)") \
1871 \
1872 product(bool, CMSPrecleaningEnabled, true, \
1873 "Whether concurrent precleaning enabled") \
1874 \
1875 product(uintx, CMSPrecleanIter, 3, \
1876 "Maximum number of precleaning iteration passes") \
1877 range(0, 9) \
1878 \
1879 product(uintx, CMSPrecleanDenominator, 3, \
1880 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1881 "ratio") \
1882 range(1, max_uintx) \
1883 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1884 \
1885 product(uintx, CMSPrecleanNumerator, 2, \
1886 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1887 "ratio") \
1888 range(0, max_uintx-1) \
1889 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1890 \
1891 product(bool, CMSPrecleanRefLists1, true, \
1892 "Preclean ref lists during (initial) preclean phase") \
1893 \
1894 product(bool, CMSPrecleanRefLists2, false, \
1895 "Preclean ref lists during abortable preclean phase") \
1896 \
1897 product(bool, CMSPrecleanSurvivors1, false, \
1898 "Preclean survivors during (initial) preclean phase") \
1899 \
1900 product(bool, CMSPrecleanSurvivors2, true, \
1901 "Preclean survivors during abortable preclean phase") \
1902 \
1903 product(uintx, CMSPrecleanThreshold, 1000, \
1904 "Do not iterate again if number of dirty cards is less than this")\
1905 range(100, max_uintx) \
1906 \
1907 product(bool, CMSCleanOnEnter, true, \
1908 "Clean-on-enter optimization for reducing number of dirty cards") \
1909 \
1910 product(uintx, CMSRemarkVerifyVariant, 1, \
1911 "Choose variant (1,2) of verification following remark") \
1912 range(1, 2) \
1913 \
1914 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1915 "If Eden size is below this, do not try to schedule remark") \
1916 range(0, max_uintx) \
1917 \
1918 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1919 "The Eden occupancy percentage (0-100) at which " \
1920 "to try and schedule remark pause") \
1921 range(0, 100) \
1922 \
1923 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1924 "Start sampling eden top at least before young gen " \
1925 "occupancy reaches 1/<ratio> of the size at which " \
1926 "we plan to schedule remark") \
1927 range(1, max_uintx) \
1928 \
1929 product(uintx, CMSSamplingGrain, 16*K, \
1930 "The minimum distance between eden samples for CMS (see above)") \
1931 range(ObjectAlignmentInBytes, max_uintx) \
1932 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \
1933 \
1934 product(bool, CMSScavengeBeforeRemark, false, \
1935 "Attempt scavenge before the CMS remark step") \
1936 \
1937 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1938 "Don't drain below this size per parallel worker/thief") \
1939 range(1, max_juint) \
1940 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1941 \
1942 manageable(intx, CMSWaitDuration, 2000, \
1943 "Time in milliseconds that CMS thread waits for young GC") \
1944 range(min_jint, max_jint) \
1945 \
1946 develop(uintx, CMSCheckInterval, 1000, \
1947 "Interval in milliseconds that CMS thread checks if it " \
1948 "should start a collection cycle") \
1949 \
1950 product(bool, CMSYield, true, \
1951 "Yield between steps of CMS") \
1952 \
1953 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1954 "Bitmap operations should process at most this many bits " \
1955 "between yields") \
1956 range(1, max_uintx) \
1957 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \
1958 \
1959 product(bool, CMSPrintChunksInDump, false, \
1960 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1961 "trace level include more detailed information about the" \
1962 "free chunks") \
1963 \
1964 product(bool, CMSPrintObjectsInDump, false, \
1965 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1966 "trace level include more detailed information about the" \
1967 "allocated objects") \
1968 \
1969 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1970 "Verify that all references across the FLS boundary " \
1971 "are to valid objects") \
1972 \
1973 diagnostic(bool, FLSVerifyLists, false, \
1974 "Do lots of (expensive) FreeListSpace verification") \
1975 \
1976 diagnostic(bool, FLSVerifyIndexTable, false, \
1977 "Do lots of (expensive) FLS index table verification") \
1978 \
1979 develop(bool, FLSVerifyDictionary, false, \
1980 "Do lots of (expensive) FLS dictionary verification") \
1981 \
1982 develop(bool, VerifyBlockOffsetArray, false, \
1983 "Do (expensive) block offset array verification") \
1984 \
1985 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1986 "Maintain _unallocated_block in BlockOffsetArray " \
1987 "(currently applicable only to CMS collector)") \
1988 \
1989 product(intx, RefDiscoveryPolicy, 0, \
1990 "Select type of reference discovery policy: " \
1991 "reference-based(0) or referent-based(1)") \
1992 range(ReferenceProcessor::DiscoveryPolicyMin, \
1993 ReferenceProcessor::DiscoveryPolicyMax) \
1994 \
1995 product(bool, ParallelRefProcEnabled, false, \
1996 "Enable parallel reference processing whenever possible") \
1997 \
1998 product(bool, ParallelRefProcBalancingEnabled, true, \
1999 "Enable balancing of reference processing queues") \
2000 \
2001 product(uintx, CMSTriggerRatio, 80, \
2002 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2003 "allocated before a CMS collection cycle commences") \
2004 range(0, 100) \
2005 \
2006 product(uintx, CMSBootstrapOccupancy, 50, \
2007 "Percentage CMS generation occupancy at which to " \
2008 "initiate CMS collection for bootstrapping collection stats") \
2009 range(0, 100) \
2010 \
2011 product(intx, CMSInitiatingOccupancyFraction, -1, \
2012 "Percentage CMS generation occupancy to start a CMS collection " \
2013 "cycle. A negative value means that CMSTriggerRatio is used") \
2014 range(min_intx, 100) \
2015 \
2016 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2017 "The percent occupancy (IHOP) of the current old generation " \
2018 "capacity above which a concurrent mark cycle will be initiated " \
2019 "Its value may change over time if adaptive IHOP is enabled, " \
2020 "otherwise the value remains constant. " \
2021 "In the latter case a value of 0 will result as frequent as " \
2022 "possible concurrent marking cycles. A value of 100 disables " \
2023 "concurrent marking. " \
2024 "Fragmentation waste in the old generation is not considered " \
2025 "free space in this calculation. (G1 collector only)") \
2026 range(0, 100) \
2027 \
2028 manageable(intx, CMSTriggerInterval, -1, \
2029 "Commence a CMS collection cycle (at least) every so many " \
2030 "milliseconds (0 permanently, -1 disabled)") \
2031 range(-1, max_intx) \
2032 \
2033 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2034 "Only use occupancy as a criterion for starting a CMS collection")\
2035 \
2036 product(uintx, CMSIsTooFullPercentage, 98, \
2037 "An absolute ceiling above which CMS will always consider the " \
2038 "unloading of classes when class unloading is enabled") \
2039 range(0, 100) \
2040 \
2041 develop(bool, CMSTestInFreeList, false, \
2042 "Check if the coalesced range is already in the " \
2043 "free lists as claimed") \
2044 \
2045 notproduct(bool, CMSVerifyReturnedBytes, false, \
2046 "Check that all the garbage collected was returned to the " \
2047 "free lists") \
2048 \
2049 notproduct(bool, ScavengeALot, false, \
2050 "Force scavenge at every Nth exit from the runtime system " \
2051 "(N=ScavengeALotInterval)") \
2052 \
2053 develop(bool, FullGCALot, false, \
2054 "Force full gc at every Nth exit from the runtime system " \
2055 "(N=FullGCALotInterval)") \
2056 \
2057 notproduct(bool, GCALotAtAllSafepoints, false, \
2058 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2059 \
2060 notproduct(bool, PromotionFailureALot, false, \
2061 "Use promotion failure handling on every youngest generation " \
2062 "collection") \
2063 \
2064 develop(uintx, PromotionFailureALotCount, 1000, \
2065 "Number of promotion failures occurring at PLAB " \
2066 "refill attempts (ParNew) or promotion attempts " \
2067 "(other young collectors)") \
2068 \
2069 develop(uintx, PromotionFailureALotInterval, 5, \
2070 "Total collections between promotion failures a lot") \
2071 \
2072 experimental(uintx, WorkStealingSleepMillis, 1, \
2073 "Sleep time when sleep is used for yields") \
2074 \
2075 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2076 "Number of yields before a sleep is done during work stealing") \
2077 \
2078 experimental(uintx, WorkStealingHardSpins, 4096, \
2079 "Number of iterations in a spin loop between checks on " \
2080 "time out of hard spin") \
2081 \
2082 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2083 "Ratio of hard spins to calls to yield") \
2084 \
2085 develop(uintx, ObjArrayMarkingStride, 512, \
2086 "Number of object array elements to push onto the marking stack " \
2087 "before pushing a continuation entry") \
2088 \
2089 develop(bool, MetadataAllocationFailALot, false, \
2090 "Fail metadata allocations at intervals controlled by " \
2091 "MetadataAllocationFailALotInterval") \
2092 \
2093 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2094 "Metadata allocation failure a lot interval") \
2095 \
2096 notproduct(bool, ExecuteInternalVMTests, false, \
2097 "Enable execution of internal VM tests") \
2098 \
2099 notproduct(bool, VerboseInternalVMTests, false, \
2100 "Turn on logging for internal VM tests.") \
2101 \
2102 product(bool, ExecutingUnitTests, false, \
2103 "Whether the JVM is running unit tests or not") \
2104 \
2105 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2106 \
2107 product_pd(bool, ResizeTLAB, \
2108 "Dynamically resize TLAB size for threads") \
2109 \
2110 product(bool, ZeroTLAB, false, \
2111 "Zero out the newly created TLAB") \
2112 \
2113 product(bool, FastTLABRefill, true, \
2114 "Use fast TLAB refill code") \
2115 \
2116 product(bool, TLABStats, true, \
2117 "Provide more detailed and expensive TLAB statistics.") \
2118 \
2119 product_pd(bool, NeverActAsServerClassMachine, \
2120 "Never act like a server-class machine") \
2121 \
2122 product(bool, AlwaysActAsServerClassMachine, false, \
2123 "Always act like a server-class machine") \
2124 \
2125 product_pd(uint64_t, MaxRAM, \
2126 "Real memory size (in bytes) used to set maximum heap size") \
2127 range(0, 0XFFFFFFFFFFFFFFFF) \
2128 \
2129 product(size_t, ErgoHeapSizeLimit, 0, \
2130 "Maximum ergonomically set heap size (in bytes); zero means use " \
2131 "MaxRAM / MaxRAMFraction") \
2132 range(0, max_uintx) \
2133 \
2134 product(uintx, MaxRAMFraction, 4, \
2135 "Maximum fraction (1/n) of real memory used for maximum heap " \
2136 "size") \
2137 range(1, max_uintx) \
2138 \
2139 product(uintx, MinRAMFraction, 2, \
2140 "Minimum fraction (1/n) of real memory used for maximum heap " \
2141 "size on systems with small physical memory size") \
2142 range(1, max_uintx) \
2143 \
2144 product(uintx, InitialRAMFraction, 64, \
2145 "Fraction (1/n) of real memory used for initial heap size") \
2146 range(1, max_uintx) \
2147 \
2148 develop(uintx, MaxVirtMemFraction, 2, \
2149 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2150 "determining maximum heap size") \
2151 \
2152 product(bool, UseAutoGCSelectPolicy, false, \
2153 "Use automatic collection selection policy") \
2154 \
2155 product(uintx, AutoGCSelectPauseMillis, 5000, \
2156 "Automatic GC selection pause threshold in milliseconds") \
2157 range(0, max_uintx) \
2158 \
2159 product(bool, UseAdaptiveSizePolicy, true, \
2160 "Use adaptive generation sizing policies") \
2161 \
2162 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2163 "Use adaptive survivor sizing policies") \
2164 \
2165 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2166 "Use adaptive young-old sizing policies at minor collections") \
2167 \
2168 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2169 "Use adaptive young-old sizing policies at major collections") \
2170 \
2171 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2172 "Include statistics from System.gc() for adaptive size policy") \
2173 \
2174 product(bool, UseAdaptiveGCBoundary, false, \
2175 "Allow young-old boundary to move") \
2176 \
2177 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2178 "Resize the virtual spaces of the young or old generations") \
2179 range(-1, 1) \
2180 \
2181 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2182 "Policy for changing generation size for throughput goals") \
2183 range(0, 1) \
2184 \
2185 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2186 "Number of steps where heuristics is used before data is used") \
2187 range(0, max_uintx) \
2188 \
2189 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2190 "Number of collections before the adaptive sizing is started") \
2191 \
2192 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2193 "Collection interval for printing information; zero means never") \
2194 range(0, max_uintx) \
2195 \
2196 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2197 "Use adaptive minimum footprint as a goal") \
2198 \
2199 product(uintx, AdaptiveSizePolicyWeight, 10, \
2200 "Weight given to exponential resizing, between 0 and 100") \
2201 range(0, 100) \
2202 \
2203 product(uintx, AdaptiveTimeWeight, 25, \
2204 "Weight given to time in adaptive policy, between 0 and 100") \
2205 range(0, 100) \
2206 \
2207 product(uintx, PausePadding, 1, \
2208 "How much buffer to keep for pause time") \
2209 range(0, max_juint) \
2210 \
2211 product(uintx, PromotedPadding, 3, \
2212 "How much buffer to keep for promotion failure") \
2213 range(0, max_juint) \
2214 \
2215 product(uintx, SurvivorPadding, 3, \
2216 "How much buffer to keep for survivor overflow") \
2217 range(0, max_juint) \
2218 \
2219 product(uintx, ThresholdTolerance, 10, \
2220 "Allowed collection cost difference between generations") \
2221 range(0, 100) \
2222 \
2223 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2224 "If collection costs are within margin, reduce both by full " \
2225 "delta") \
2226 range(0, 100) \
2227 \
2228 product(uintx, YoungGenerationSizeIncrement, 20, \
2229 "Adaptive size percentage change in young generation") \
2230 range(0, 100) \
2231 \
2232 product(uintx, YoungGenerationSizeSupplement, 80, \
2233 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2234 range(0, 100) \
2235 \
2236 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2237 "Decay factor to YoungedGenerationSizeSupplement") \
2238 range(1, max_uintx) \
2239 \
2240 product(uintx, TenuredGenerationSizeIncrement, 20, \
2241 "Adaptive size percentage change in tenured generation") \
2242 range(0, 100) \
2243 \
2244 product(uintx, TenuredGenerationSizeSupplement, 80, \
2245 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2246 range(0, 100) \
2247 \
2248 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2249 "Decay factor to TenuredGenerationSizeIncrement") \
2250 range(1, max_uintx) \
2251 \
2252 product(uintx, MaxGCPauseMillis, max_uintx - 1, \
2253 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2254 "or (G1 Only) the maximum GC time per MMU time slice") \
2255 range(1, max_uintx - 1) \
2256 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2257 \
2258 product(uintx, GCPauseIntervalMillis, 0, \
2259 "Time slice for MMU specification") \
2260 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2261 \
2262 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2263 "Adaptive size policy maximum GC minor pause time goal " \
2264 "in millisecond") \
2265 range(0, max_uintx) \
2266 \
2267 product(uintx, GCTimeRatio, 99, \
2268 "Adaptive size policy application time to GC time ratio") \
2269 range(0, max_juint) \
2270 \
2271 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2272 "Adaptive size scale down factor for shrinking") \
2273 range(1, max_uintx) \
2274 \
2275 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2276 "Adaptive size decays the major cost for long major intervals") \
2277 \
2278 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2279 "Time scale over which major costs decay") \
2280 range(0, max_uintx) \
2281 \
2282 product(uintx, MinSurvivorRatio, 3, \
2283 "Minimum ratio of young generation/survivor space size") \
2284 range(3, max_uintx) \
2285 \
2286 product(uintx, InitialSurvivorRatio, 8, \
2287 "Initial ratio of young generation/survivor space size") \
2288 range(0, max_uintx) \
2289 \
2290 product(size_t, BaseFootPrintEstimate, 256*M, \
2291 "Estimate of footprint other than Java Heap") \
2292 range(0, max_uintx) \
2293 \
2294 product(bool, UseGCOverheadLimit, true, \
2295 "Use policy to limit of proportion of time spent in GC " \
2296 "before an OutOfMemory error is thrown") \
2297 \
2298 product(uintx, GCTimeLimit, 98, \
2299 "Limit of the proportion of time spent in GC before " \
2300 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2301 range(0, 100) \
2302 \
2303 product(uintx, GCHeapFreeLimit, 2, \
2304 "Minimum percentage of free space after a full GC before an " \
2305 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2306 range(0, 100) \
2307 \
2308 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2309 "Number of consecutive collections before gc time limit fires") \
2310 range(1, max_uintx) \
2311 \
2312 product(intx, PrefetchCopyIntervalInBytes, -1, \
2313 "How far ahead to prefetch destination area (<= 0 means off)") \
2314 range(-1, max_jint) \
2315 \
2316 product(intx, PrefetchScanIntervalInBytes, -1, \
2317 "How far ahead to prefetch scan area (<= 0 means off)") \
2318 range(-1, max_jint) \
2319 \
2320 product(intx, PrefetchFieldsAhead, -1, \
2321 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2322 range(-1, max_jint) \
2323 \
2324 diagnostic(bool, VerifyDuringStartup, false, \
2325 "Verify memory system before executing any Java code " \
2326 "during VM initialization") \
2327 \
2328 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2329 "Verify system before exiting") \
2330 \
2331 diagnostic(bool, VerifyBeforeGC, false, \
2332 "Verify memory system before GC") \
2333 \
2334 diagnostic(bool, VerifyAfterGC, false, \
2335 "Verify memory system after GC") \
2336 \
2337 diagnostic(bool, VerifyDuringGC, false, \
2338 "Verify memory system during GC (between phases)") \
2339 \
2340 diagnostic(ccstrlist, VerifySubSet, "", \
2341 "Memory sub-systems to verify when Verify*GC flag(s) " \
2342 "are enabled. One or more sub-systems can be specified " \
2343 "in a comma separated string. Sub-systems are: " \
2344 "threads, heap, symbol_table, string_table, codecache, " \
2345 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2346 "c-heap, codecache_oops") \
2347 \
2348 diagnostic(bool, GCParallelVerificationEnabled, true, \
2349 "Enable parallel memory system verification") \
2350 \
2351 diagnostic(bool, DeferInitialCardMark, false, \
2352 "When +ReduceInitialCardMarks, explicitly defer any that " \
2353 "may arise from new_pre_store_barrier") \
2354 \
2355 product(bool, UseCondCardMark, false, \
2356 "Check for already marked card before updating card table") \
2357 \
2358 diagnostic(bool, VerifyRememberedSets, false, \
2359 "Verify GC remembered sets") \
2360 \
2361 diagnostic(bool, VerifyObjectStartArray, true, \
2362 "Verify GC object start array if verify before/after") \
2363 \
2364 product(bool, DisableExplicitGC, false, \
2365 "Ignore calls to System.gc()") \
2366 \
2367 notproduct(bool, CheckMemoryInitialization, false, \
2368 "Check memory initialization") \
2369 \
2370 diagnostic(bool, BindCMSThreadToCPU, false, \
2371 "Bind CMS Thread to CPU if possible") \
2372 \
2373 diagnostic(uintx, CPUForCMSThread, 0, \
2374 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2375 range(0, max_juint) \
2376 \
2377 product(bool, BindGCTaskThreadsToCPUs, false, \
2378 "Bind GCTaskThreads to CPUs if possible") \
2379 \
2380 product(bool, UseGCTaskAffinity, false, \
2381 "Use worker affinity when asking for GCTasks") \
2382 \
2383 product(uintx, ProcessDistributionStride, 4, \
2384 "Stride through processors when distributing processes") \
2385 range(0, max_juint) \
2386 \
2387 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2388 "Number of times the coordinator GC thread will sleep while " \
2389 "yielding before giving up and resuming GC") \
2390 range(0, max_juint) \
2391 \
2392 product(uintx, CMSYieldSleepCount, 0, \
2393 "Number of times a GC thread (minus the coordinator) " \
2394 "will sleep while yielding before giving up and resuming GC") \
2395 range(0, max_juint) \
2396 \
2397 product(bool, PrintGC, false, \
2398 "Print message at garbage collection. " \
2399 "Deprecated, use -Xlog:gc instead.") \
2400 \
2401 product(bool, PrintGCDetails, false, \
2402 "Print more details at garbage collection. " \
2403 "Deprecated, use -Xlog:gc* instead.") \
2404 \
2405 develop(intx, ConcGCYieldTimeout, 0, \
2406 "If non-zero, assert that GC threads yield within this " \
2407 "number of milliseconds") \
2408 range(0, max_intx) \
2409 \
2410 develop(bool, TraceFinalizerRegistration, false, \
2411 "Trace registration of final references") \
2412 \
2413 notproduct(bool, TraceScavenge, false, \
2414 "Trace scavenge") \
2415 \
2416 product(bool, IgnoreEmptyClassPaths, false, \
2417 "Ignore empty path elements in -classpath") \
2418 \
2419 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2420 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2421 "Initial size of the boot class loader data metaspace") \
2422 range(30*K, max_uintx/BytesPerWord) \
2423 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2424 \
2425 product(bool, TraceYoungGenTime, false, \
2426 "Trace accumulated time for young collection") \
2427 \
2428 product(bool, TraceOldGenTime, false, \
2429 "Trace accumulated time for old collection") \
2430 \
2431 product(bool, PrintHeapAtSIGBREAK, true, \
2432 "Print heap layout in response to SIGBREAK") \
2433 \
2434 manageable(bool, PrintClassHistogram, false, \
2435 "Print a histogram of class instances") \
2436 \
2437 develop(bool, TraceGCTaskManager, false, \
2438 "Trace actions of the GC task manager") \
2439 \
2440 develop(bool, TraceGCTaskQueue, false, \
2441 "Trace actions of the GC task queues") \
2442 \
2443 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2444 "Trace marking phase in ParallelOldGC") \
2445 \
2446 develop(bool, TraceParallelOldGCDensePrefix, false, \
2447 "Trace dense prefix computation for ParallelOldGC") \
2448 \
2449 develop(bool, IgnoreLibthreadGPFault, false, \
2450 "Suppress workaround for libthread GP fault") \
2451 \
2452 experimental(double, ObjectCountCutOffPercent, 0.5, \
2453 "The percentage of the used heap that the instances of a class " \
2454 "must occupy for the class to generate a trace event") \
2455 range(0.0, 100.0) \
2456 \
2457 /* JVMTI heap profiling */ \
2458 \
2459 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2460 "Trace JVMTI object tagging calls") \
2461 \
2462 diagnostic(bool, VerifyBeforeIteration, false, \
2463 "Verify memory system before JVMTI iteration") \
2464 \
2465 /* compiler interface */ \
2466 \
2467 develop(bool, CIPrintCompilerName, false, \
2468 "when CIPrint is active, print the name of the active compiler") \
2469 \
2470 diagnostic(bool, CIPrintCompileQueue, false, \
2471 "display the contents of the compile queue whenever a " \
2472 "compilation is enqueued") \
2473 \
2474 develop(bool, CIPrintRequests, false, \
2475 "display every request for compilation") \
2476 \
2477 product(bool, CITime, false, \
2478 "collect timing information for compilation") \
2479 \
2480 develop(bool, CITimeVerbose, false, \
2481 "be more verbose in compilation timings") \
2482 \
2483 develop(bool, CITimeEach, false, \
2484 "display timing information after each successful compilation") \
2485 \
2486 develop(bool, CICountOSR, false, \
2487 "use a separate counter when assigning ids to osr compilations") \
2488 \
2489 develop(bool, CICompileNatives, true, \
2490 "compile native methods if supported by the compiler") \
2491 \
2492 develop_pd(bool, CICompileOSR, \
2493 "compile on stack replacement methods if supported by the " \
2494 "compiler") \
2495 \
2496 develop(bool, CIPrintMethodCodes, false, \
2497 "print method bytecodes of the compiled code") \
2498 \
2499 develop(bool, CIPrintTypeFlow, false, \
2500 "print the results of ciTypeFlow analysis") \
2501 \
2502 develop(bool, CITraceTypeFlow, false, \
2503 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2504 \
2505 develop(intx, OSROnlyBCI, -1, \
2506 "OSR only at this bci. Negative values mean exclude that bci") \
2507 \
2508 /* compiler */ \
2509 \
2510 /* notice: the max range value here is max_jint, not max_intx */ \
2511 /* because of overflow issue */ \
2512 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2513 "Number of compiler threads to run") \
2514 range(0, max_jint) \
2515 constraint(CICompilerCountConstraintFunc, AtParse) \
2516 \
2517 product(intx, CompilationPolicyChoice, 0, \
2518 "which compilation policy (0-3)") \
2519 range(0, 3) \
2520 \
2521 develop(bool, UseStackBanging, true, \
2522 "use stack banging for stack overflow checks (required for " \
2523 "proper StackOverflow handling; disable only to measure cost " \
2524 "of stackbanging)") \
2525 \
2526 develop(bool, UseStrictFP, true, \
2527 "use strict fp if modifier strictfp is set") \
2528 \
2529 develop(bool, GenerateSynchronizationCode, true, \
2530 "generate locking/unlocking code for synchronized methods and " \
2531 "monitors") \
2532 \
2533 develop(bool, GenerateRangeChecks, true, \
2534 "Generate range checks for array accesses") \
2535 \
2536 develop_pd(bool, ImplicitNullChecks, \
2537 "Generate code for implicit null checks") \
2538 \
2539 product_pd(bool, TrapBasedNullChecks, \
2540 "Generate code for null checks that uses a cmp and trap " \
2541 "instruction raising SIGTRAP. This is only used if an access to" \
2542 "null (+offset) will not raise a SIGSEGV, i.e.," \
2543 "ImplicitNullChecks don't work (PPC64).") \
2544 \
2545 product(bool, PrintSafepointStatistics, false, \
2546 "Print statistics about safepoint synchronization") \
2547 \
2548 product(intx, PrintSafepointStatisticsCount, 300, \
2549 "Total number of safepoint statistics collected " \
2550 "before printing them out") \
2551 range(1, max_intx) \
2552 \
2553 product(intx, PrintSafepointStatisticsTimeout, -1, \
2554 "Print safepoint statistics only when safepoint takes " \
2555 "more than PrintSafepointSatisticsTimeout in millis") \
2556 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2557 NOT_LP64(range(-1, max_intx)) \
2558 \
2559 product(bool, Inline, true, \
2560 "Enable inlining") \
2561 \
2562 product(bool, ClipInlining, true, \
2563 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2564 \
2565 develop(bool, UseCHA, true, \
2566 "Enable CHA") \
2567 \
2568 product(bool, UseTypeProfile, true, \
2569 "Check interpreter profile for historically monomorphic calls") \
2570 \
2571 diagnostic(bool, PrintInlining, false, \
2572 "Print inlining optimizations") \
2573 \
2574 product(bool, UsePopCountInstruction, false, \
2575 "Use population count instruction") \
2576 \
2577 develop(bool, EagerInitialization, false, \
2578 "Eagerly initialize classes if possible") \
2579 \
2580 diagnostic(bool, LogTouchedMethods, false, \
2581 "Log methods which have been ever touched in runtime") \
2582 \
2583 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2584 "Print all methods that have been ever touched in runtime") \
2585 \
2586 develop(bool, TraceMethodReplacement, false, \
2587 "Print when methods are replaced do to recompilation") \
2588 \
2589 develop(bool, PrintMethodFlushing, false, \
2590 "Print the nmethods being flushed") \
2591 \
2592 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2593 "print statistics about method flushing") \
2594 \
2595 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2596 "Number of compiled code invocations after which " \
2597 "the method is considered as hot by the flusher") \
2598 range(1, max_jint) \
2599 \
2600 diagnostic(intx, MinPassesBeforeFlush, 10, \
2601 "Minimum number of sweeper passes before an nmethod " \
2602 "can be flushed") \
2603 range(0, max_intx) \
2604 \
2605 product(bool, UseCodeAging, true, \
2606 "Insert counter to detect warm methods") \
2607 \
2608 diagnostic(bool, StressCodeAging, false, \
2609 "Start with counters compiled in") \
2610 \
2611 develop(bool, UseRelocIndex, false, \
2612 "Use an index to speed random access to relocations") \
2613 \
2614 develop(bool, StressCodeBuffers, false, \
2615 "Exercise code buffer expansion and other rare state changes") \
2616 \
2617 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2618 "Generate extra debugging information for non-safepoints in " \
2619 "nmethods") \
2620 \
2621 product(bool, PrintVMOptions, false, \
2622 "Print flags that appeared on the command line") \
2623 \
2624 product(bool, IgnoreUnrecognizedVMOptions, false, \
2625 "Ignore unrecognized VM options") \
2626 \
2627 product(bool, PrintCommandLineFlags, false, \
2628 "Print flags specified on command line or set by ergonomics") \
2629 \
2630 product(bool, PrintFlagsInitial, false, \
2631 "Print all VM flags before argument processing and exit VM") \
2632 \
2633 product(bool, PrintFlagsFinal, false, \
2634 "Print all VM flags after argument and ergonomic processing") \
2635 \
2636 notproduct(bool, PrintFlagsWithComments, false, \
2637 "Print all VM flags with default values and descriptions and " \
2638 "exit") \
2639 \
2640 product(bool, PrintFlagsRanges, false, \
2641 "Print VM flags and their ranges and exit VM") \
2642 \
2643 diagnostic(bool, SerializeVMOutput, true, \
2644 "Use a mutex to serialize output to tty and LogFile") \
2645 \
2646 diagnostic(bool, DisplayVMOutput, true, \
2647 "Display all VM output on the tty, independently of LogVMOutput") \
2648 \
2649 diagnostic(bool, LogVMOutput, false, \
2650 "Save VM output to LogFile") \
2651 \
2652 diagnostic(ccstr, LogFile, NULL, \
2653 "If LogVMOutput or LogCompilation is on, save VM output to " \
2654 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2655 \
2656 product(ccstr, ErrorFile, NULL, \
2657 "If an error occurs, save the error data to this file " \
2658 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2659 \
2660 product(bool, DisplayVMOutputToStderr, false, \
2661 "If DisplayVMOutput is true, display all VM output to stderr") \
2662 \
2663 product(bool, DisplayVMOutputToStdout, false, \
2664 "If DisplayVMOutput is true, display all VM output to stdout") \
2665 \
2666 product(bool, UseHeavyMonitors, false, \
2667 "use heavyweight instead of lightweight Java monitors") \
2668 \
2669 product(bool, PrintStringTableStatistics, false, \
2670 "print statistics about the StringTable and SymbolTable") \
2671 \
2672 diagnostic(bool, VerifyStringTableAtExit, false, \
2673 "verify StringTable contents at exit") \
2674 \
2675 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2676 "print histogram of the symbol table") \
2677 \
2678 notproduct(bool, ExitVMOnVerifyError, false, \
2679 "standard exit from VM if bytecode verify error " \
2680 "(only in debug mode)") \
2681 \
2682 diagnostic(ccstr, AbortVMOnException, NULL, \
2683 "Call fatal if this exception is thrown. Example: " \
2684 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2685 \
2686 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2687 "Call fatal if the exception pointed by AbortVMOnException " \
2688 "has this message") \
2689 \
2690 develop(bool, DebugVtables, false, \
2691 "add debugging code to vtable dispatch") \
2692 \
2693 notproduct(bool, PrintVtableStats, false, \
2694 "print vtables stats at end of run") \
2695 \
2696 develop(bool, TraceCreateZombies, false, \
2697 "trace creation of zombie nmethods") \
2698 \
2699 notproduct(bool, IgnoreLockingAssertions, false, \
2700 "disable locking assertions (for speed)") \
2701 \
2702 product(bool, RangeCheckElimination, true, \
2703 "Eliminate range checks") \
2704 \
2705 develop_pd(bool, UncommonNullCast, \
2706 "track occurrences of null in casts; adjust compiler tactics") \
2707 \
2708 develop(bool, TypeProfileCasts, true, \
2709 "treat casts like calls for purposes of type profiling") \
2710 \
2711 develop(bool, DelayCompilationDuringStartup, true, \
2712 "Delay invoking the compiler until main application class is " \
2713 "loaded") \
2714 \
2715 develop(bool, CompileTheWorld, false, \
2716 "Compile all methods in all classes in bootstrap class path " \
2717 "(stress test)") \
2718 \
2719 develop(bool, CompileTheWorldPreloadClasses, true, \
2720 "Preload all classes used by a class before start loading") \
2721 \
2722 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2723 "Force a safepoint every n compiles so sweeper can keep up") \
2724 \
2725 develop(bool, FillDelaySlots, true, \
2726 "Fill delay slots (on SPARC only)") \
2727 \
2728 develop(bool, TimeLivenessAnalysis, false, \
2729 "Time computation of bytecode liveness analysis") \
2730 \
2731 develop(bool, TraceLivenessGen, false, \
2732 "Trace the generation of liveness analysis information") \
2733 \
2734 notproduct(bool, TraceLivenessQuery, false, \
2735 "Trace queries of liveness analysis information") \
2736 \
2737 notproduct(bool, CollectIndexSetStatistics, false, \
2738 "Collect information about IndexSets") \
2739 \
2740 develop(bool, UseLoopSafepoints, true, \
2741 "Generate Safepoint nodes in every loop") \
2742 \
2743 develop(intx, FastAllocateSizeLimit, 128*K, \
2744 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2745 "Inline allocations larger than this in doublewords must go slow")\
2746 \
2747 product(bool, AggressiveOpts, false, \
2748 "Enable aggressive optimizations - see arguments.cpp") \
2749 \
2750 product_pd(bool, CompactStrings, \
2751 "Enable Strings to use single byte chars in backing store") \
2752 \
2753 product_pd(uintx, TypeProfileLevel, \
2754 "=XYZ, with Z: Type profiling of arguments at call; " \
2755 "Y: Type profiling of return value at call; " \
2756 "X: Type profiling of parameters to methods; " \
2757 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2758 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2759 \
2760 product(intx, TypeProfileArgsLimit, 2, \
2761 "max number of call arguments to consider for type profiling") \
2762 range(0, 16) \
2763 \
2764 product(intx, TypeProfileParmsLimit, 2, \
2765 "max number of incoming parameters to consider for type profiling"\
2766 ", -1 for all") \
2767 range(-1, 64) \
2768 \
2769 /* statistics */ \
2770 develop(bool, CountCompiledCalls, false, \
2771 "Count method invocations") \
2772 \
2773 notproduct(bool, CountRuntimeCalls, false, \
2774 "Count VM runtime calls") \
2775 \
2776 develop(bool, CountJNICalls, false, \
2777 "Count jni method invocations") \
2778 \
2779 notproduct(bool, CountJVMCalls, false, \
2780 "Count jvm method invocations") \
2781 \
2782 notproduct(bool, CountRemovableExceptions, false, \
2783 "Count exceptions that could be replaced by branches due to " \
2784 "inlining") \
2785 \
2786 notproduct(bool, ICMissHistogram, false, \
2787 "Produce histogram of IC misses") \
2788 \
2789 /* interpreter */ \
2790 product_pd(bool, RewriteBytecodes, \
2791 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2792 \
2793 product_pd(bool, RewriteFrequentPairs, \
2794 "Rewrite frequently used bytecode pairs into a single bytecode") \
2795 \
2796 diagnostic(bool, PrintInterpreter, false, \
2797 "Print the generated interpreter code") \
2798 \
2799 product(bool, UseInterpreter, true, \
2800 "Use interpreter for non-compiled methods") \
2801 \
2802 develop(bool, UseFastSignatureHandlers, true, \
2803 "Use fast signature handlers for native calls") \
2804 \
2805 product(bool, UseLoopCounter, true, \
2806 "Increment invocation counter on backward branch") \
2807 \
2808 product_pd(bool, UseOnStackReplacement, \
2809 "Use on stack replacement, calls runtime if invoc. counter " \
2810 "overflows in loop") \
2811 \
2812 notproduct(bool, TraceOnStackReplacement, false, \
2813 "Trace on stack replacement") \
2814 \
2815 product_pd(bool, PreferInterpreterNativeStubs, \
2816 "Use always interpreter stubs for native methods invoked via " \
2817 "interpreter") \
2818 \
2819 develop(bool, CountBytecodes, false, \
2820 "Count number of bytecodes executed") \
2821 \
2822 develop(bool, PrintBytecodeHistogram, false, \
2823 "Print histogram of the executed bytecodes") \
2824 \
2825 develop(bool, PrintBytecodePairHistogram, false, \
2826 "Print histogram of the executed bytecode pairs") \
2827 \
2828 diagnostic(bool, PrintSignatureHandlers, false, \
2829 "Print code generated for native method signature handlers") \
2830 \
2831 develop(bool, VerifyOops, false, \
2832 "Do plausibility checks for oops") \
2833 \
2834 develop(bool, CheckUnhandledOops, false, \
2835 "Check for unhandled oops in VM code") \
2836 \
2837 develop(bool, VerifyJNIFields, trueInDebug, \
2838 "Verify jfieldIDs for instance fields") \
2839 \
2840 notproduct(bool, VerifyJNIEnvThread, false, \
2841 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2842 "from JNI") \
2843 \
2844 develop(bool, VerifyFPU, false, \
2845 "Verify FPU state (check for NaN's, etc.)") \
2846 \
2847 develop(bool, VerifyThread, false, \
2848 "Watch the thread register for corruption (SPARC only)") \
2849 \
2850 develop(bool, VerifyActivationFrameSize, false, \
2851 "Verify that activation frame didn't become smaller than its " \
2852 "minimal size") \
2853 \
2854 develop(bool, TraceFrequencyInlining, false, \
2855 "Trace frequency based inlining") \
2856 \
2857 develop_pd(bool, InlineIntrinsics, \
2858 "Inline intrinsics that can be statically resolved") \
2859 \
2860 product_pd(bool, ProfileInterpreter, \
2861 "Profile at the bytecode level during interpretation") \
2862 \
2863 develop(bool, TraceProfileInterpreter, false, \
2864 "Trace profiling at the bytecode level during interpretation. " \
2865 "This outputs the profiling information collected to improve " \
2866 "jit compilation.") \
2867 \
2868 develop_pd(bool, ProfileTraps, \
2869 "Profile deoptimization traps at the bytecode level") \
2870 \
2871 product(intx, ProfileMaturityPercentage, 20, \
2872 "number of method invocations/branches (expressed as % of " \
2873 "CompileThreshold) before using the method's profile") \
2874 range(0, 100) \
2875 \
2876 diagnostic(bool, PrintMethodData, false, \
2877 "Print the results of +ProfileInterpreter at end of run") \
2878 \
2879 develop(bool, VerifyDataPointer, trueInDebug, \
2880 "Verify the method data pointer during interpreter profiling") \
2881 \
2882 develop(bool, VerifyCompiledCode, false, \
2883 "Include miscellaneous runtime verifications in nmethod code; " \
2884 "default off because it disturbs nmethod size heuristics") \
2885 \
2886 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2887 "Manually make GC thread crash then dump java stack trace; " \
2888 "Test only") \
2889 \
2890 /* compilation */ \
2891 product(bool, UseCompiler, true, \
2892 "Use Just-In-Time compilation") \
2893 \
2894 develop(bool, TraceCompilationPolicy, false, \
2895 "Trace compilation policy") \
2896 \
2897 develop(bool, TimeCompilationPolicy, false, \
2898 "Time the compilation policy") \
2899 \
2900 product(bool, UseCounterDecay, true, \
2901 "Adjust recompilation counters") \
2902 \
2903 develop(intx, CounterHalfLifeTime, 30, \
2904 "Half-life time of invocation counters (in seconds)") \
2905 \
2906 develop(intx, CounterDecayMinIntervalLength, 500, \
2907 "The minimum interval (in milliseconds) between invocation of " \
2908 "CounterDecay") \
2909 \
2910 product(bool, AlwaysCompileLoopMethods, false, \
2911 "When using recompilation, never interpret methods " \
2912 "containing loops") \
2913 \
2914 product(bool, DontCompileHugeMethods, true, \
2915 "Do not compile methods > HugeMethodLimit") \
2916 \
2917 /* Bytecode escape analysis estimation. */ \
2918 product(bool, EstimateArgEscape, true, \
2919 "Analyze bytecodes to estimate escape state of arguments") \
2920 \
2921 product(intx, BCEATraceLevel, 0, \
2922 "How much tracing to do of bytecode escape analysis estimates " \
2923 "(0-3)") \
2924 range(0, 3) \
2925 \
2926 product(intx, MaxBCEAEstimateLevel, 5, \
2927 "Maximum number of nested calls that are analyzed by BC EA") \
2928 range(0, max_jint) \
2929 \
2930 product(intx, MaxBCEAEstimateSize, 150, \
2931 "Maximum bytecode size of a method to be analyzed by BC EA") \
2932 range(0, max_jint) \
2933 \
2934 product(intx, AllocatePrefetchStyle, 1, \
2935 "0 = no prefetch, " \
2936 "1 = generate prefetch instructions for each allocation, " \
2937 "2 = use TLAB watermark to gate allocation prefetch, " \
2938 "3 = generate one prefetch instruction per cache line") \
2939 range(0, 3) \
2940 \
2941 product(intx, AllocatePrefetchDistance, -1, \
2942 "Distance to prefetch ahead of allocation pointer. " \
2943 "-1: use system-specific value (automatically determined") \
2944 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2945 \
2946 product(intx, AllocatePrefetchLines, 3, \
2947 "Number of lines to prefetch ahead of array allocation pointer") \
2948 range(1, 64) \
2949 \
2950 product(intx, AllocateInstancePrefetchLines, 1, \
2951 "Number of lines to prefetch ahead of instance allocation " \
2952 "pointer") \
2953 range(1, 64) \
2954 \
2955 product(intx, AllocatePrefetchStepSize, 16, \
2956 "Step size in bytes of sequential prefetch instructions") \
2957 range(1, 512) \
2958 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2959 \
2960 product(intx, AllocatePrefetchInstr, 0, \
2961 "Select instruction to prefetch ahead of allocation pointer") \
2962 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
2963 \
2964 /* deoptimization */ \
2965 develop(bool, TraceDeoptimization, false, \
2966 "Trace deoptimization") \
2967 \
2968 develop(bool, PrintDeoptimizationDetails, false, \
2969 "Print more information about deoptimization") \
2970 \
2971 develop(bool, DebugDeoptimization, false, \
2972 "Tracing various information while debugging deoptimization") \
2973 \
2974 product(intx, SelfDestructTimer, 0, \
2975 "Will cause VM to terminate after a given time (in minutes) " \
2976 "(0 means off)") \
2977 range(0, max_intx) \
2978 \
2979 product(intx, MaxJavaStackTraceDepth, 1024, \
2980 "The maximum number of lines in the stack trace for Java " \
2981 "exceptions (0 means all)") \
2982 range(0, max_jint/2) \
2983 \
2984 develop(bool, TraceStackWalk, false, \
2985 "Trace stack walking") \
2986 \
2987 /* notice: the max range value here is max_jint, not max_intx */ \
2988 /* because of overflow issue */ \
2989 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2990 "Guarantee a safepoint (at least) every so many milliseconds " \
2991 "(0 means none)")) \
2992 NOT_EMBEDDED(range(0, max_jint)) \
2993 \
2994 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2995 "Guarantee a safepoint (at least) every so many milliseconds " \
2996 "(0 means none)")) \
2997 EMBEDDED_ONLY(range(0, max_jint)) \
2998 \
2999 product(intx, SafepointTimeoutDelay, 10000, \
3000 "Delay in milliseconds for option SafepointTimeout") \
3001 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
3002 NOT_LP64(range(0, max_intx)) \
3003 \
3004 product(intx, NmethodSweepActivity, 10, \
3005 "Removes cold nmethods from code cache if > 0. Higher values " \
3006 "result in more aggressive sweeping") \
3007 range(0, 2000) \
3008 \
3009 notproduct(bool, LogSweeper, false, \
3010 "Keep a ring buffer of sweeper activity") \
3011 \
3012 notproduct(intx, SweeperLogEntries, 1024, \
3013 "Number of records in the ring buffer of sweeper activity") \
3014 \
3015 notproduct(intx, MemProfilingInterval, 500, \
3016 "Time between each invocation of the MemProfiler") \
3017 \
3018 develop(intx, MallocCatchPtr, -1, \
3019 "Hit breakpoint when mallocing/freeing this pointer") \
3020 \
3021 notproduct(ccstrlist, SuppressErrorAt, "", \
3022 "List of assertions (file:line) to muzzle") \
3023 \
3024 develop(intx, StackPrintLimit, 100, \
3025 "number of stack frames to print in VM-level stack dump") \
3026 \
3027 notproduct(intx, MaxElementPrintSize, 256, \
3028 "maximum number of elements to print") \
3029 \
3030 notproduct(intx, MaxSubklassPrintSize, 4, \
3031 "maximum number of subklasses to print when printing klass") \
3032 \
3033 product(intx, MaxInlineLevel, 9, \
3034 "maximum number of nested calls that are inlined") \
3035 range(0, max_jint) \
3036 \
3037 product(intx, MaxRecursiveInlineLevel, 1, \
3038 "maximum number of nested recursive calls that are inlined") \
3039 range(0, max_jint) \
3040 \
3041 develop(intx, MaxForceInlineLevel, 100, \
3042 "maximum number of nested calls that are forced for inlining " \
3043 "(using CompileCommand or marked w/ @ForceInline)") \
3044 range(0, max_jint) \
3045 \
3046 product_pd(intx, InlineSmallCode, \
3047 "Only inline already compiled methods if their code size is " \
3048 "less than this") \
3049 range(0, max_jint) \
3050 \
3051 product(intx, MaxInlineSize, 35, \
3052 "The maximum bytecode size of a method to be inlined") \
3053 range(0, max_jint) \
3054 \
3055 product_pd(intx, FreqInlineSize, \
3056 "The maximum bytecode size of a frequent method to be inlined") \
3057 range(0, max_jint) \
3058 \
3059 product(intx, MaxTrivialSize, 6, \
3060 "The maximum bytecode size of a trivial method to be inlined") \
3061 range(0, max_jint) \
3062 \
3063 product(intx, MinInliningThreshold, 250, \
3064 "The minimum invocation count a method needs to have to be " \
3065 "inlined") \
3066 range(0, max_jint) \
3067 \
3068 develop(intx, MethodHistogramCutoff, 100, \
3069 "The cutoff value for method invocation histogram (+CountCalls)") \
3070 \
3071 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
3072 "Number of interpreted methods to show in profile") \
3073 \
3074 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
3075 "Number of compiled methods to show in profile") \
3076 \
3077 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
3078 "Number of stub methods to show in profile") \
3079 \
3080 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3081 "Number of runtime stub nodes to show in profile") \
3082 \
3083 product(intx, ProfileIntervalsTicks, 100, \
3084 "Number of ticks between printing of interval profile " \
3085 "(+ProfileIntervals)") \
3086 range(0, max_intx) \
3087 \
3088 notproduct(intx, ScavengeALotInterval, 1, \
3089 "Interval between which scavenge will occur with +ScavengeALot") \
3090 \
3091 notproduct(intx, FullGCALotInterval, 1, \
3092 "Interval between which full gc will occur with +FullGCALot") \
3093 \
3094 notproduct(intx, FullGCALotStart, 0, \
3095 "For which invocation to start FullGCAlot") \
3096 \
3097 notproduct(intx, FullGCALotDummies, 32*K, \
3098 "Dummy object allocated with +FullGCALot, forcing all objects " \
3099 "to move") \
3100 \
3101 develop(intx, DontYieldALotInterval, 10, \
3102 "Interval between which yields will be dropped (milliseconds)") \
3103 \
3104 develop(intx, MinSleepInterval, 1, \
3105 "Minimum sleep() interval (milliseconds) when " \
3106 "ConvertSleepToYield is off (used for Solaris)") \
3107 \
3108 develop(intx, ProfilerPCTickThreshold, 15, \
3109 "Number of ticks in a PC buckets to be a hotspot") \
3110 \
3111 notproduct(intx, DeoptimizeALotInterval, 5, \
3112 "Number of exits until DeoptimizeALot kicks in") \
3113 \
3114 notproduct(intx, ZombieALotInterval, 5, \
3115 "Number of exits until ZombieALot kicks in") \
3116 \
3117 diagnostic(intx, MallocVerifyInterval, 0, \
3118 "If non-zero, verify C heap after every N calls to " \
3119 "malloc/realloc/free") \
3120 range(0, max_intx) \
3121 \
3122 diagnostic(intx, MallocVerifyStart, 0, \
3123 "If non-zero, start verifying C heap after Nth call to " \
3124 "malloc/realloc/free") \
3125 range(0, max_intx) \
3126 \
3127 diagnostic(uintx, MallocMaxTestWords, 0, \
3128 "If non-zero, maximum number of words that malloc/realloc can " \
3129 "allocate (for testing only)") \
3130 range(0, max_uintx) \
3131 \
3132 product(intx, TypeProfileWidth, 2, \
3133 "Number of receiver types to record in call/cast profile") \
3134 range(0, 8) \
3135 \
3136 experimental(intx, MethodProfileWidth, 0, \
3137 "Number of methods to record in call profile") \
3138 \
3139 develop(intx, BciProfileWidth, 2, \
3140 "Number of return bci's to record in ret profile") \
3141 \
3142 product(intx, PerMethodRecompilationCutoff, 400, \
3143 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3144 range(-1, max_intx) \
3145 \
3146 product(intx, PerBytecodeRecompilationCutoff, 200, \
3147 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3148 range(-1, max_intx) \
3149 \
3150 product(intx, PerMethodTrapLimit, 100, \
3151 "Limit on traps (of one kind) in a method (includes inlines)") \
3152 range(0, max_jint) \
3153 \
3154 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3155 "Limit on speculative traps (of one kind) in a method " \
3156 "(includes inlines)") \
3157 range(0, max_jint) \
3158 \
3159 product(intx, PerBytecodeTrapLimit, 4, \
3160 "Limit on traps (of one kind) at a particular BCI") \
3161 range(0, max_jint) \
3162 \
3163 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3164 "Extra method data trap entries for speculation") \
3165 \
3166 develop(intx, InlineFrequencyRatio, 20, \
3167 "Ratio of call site execution to caller method invocation") \
3168 range(0, max_jint) \
3169 \
3170 develop_pd(intx, InlineFrequencyCount, \
3171 "Count of call site execution necessary to trigger frequent " \
3172 "inlining") \
3173 range(0, max_jint) \
3174 \
3175 develop(intx, InlineThrowCount, 50, \
3176 "Force inlining of interpreted methods that throw this often") \
3177 range(0, max_jint) \
3178 \
3179 develop(intx, InlineThrowMaxSize, 200, \
3180 "Force inlining of throwing methods smaller than this") \
3181 range(0, max_jint) \
3182 \
3183 develop(intx, ProfilerNodeSize, 1024, \
3184 "Size in K to allocate for the Profile Nodes of each thread") \
3185 range(0, 1024) \
3186 \
3187 /* gc parameters */ \
3188 product(size_t, InitialHeapSize, 0, \
3189 "Initial heap size (in bytes); zero means use ergonomics") \
3190 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3191 \
3192 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3193 "Maximum heap size (in bytes)") \
3194 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3195 \
3196 product(size_t, OldSize, ScaleForWordSize(4*M), \
3197 "Initial tenured generation size (in bytes)") \
3198 range(0, max_uintx) \
3199 \
3200 product(size_t, NewSize, ScaleForWordSize(1*M), \
3201 "Initial new generation size (in bytes)") \
3202 constraint(NewSizeConstraintFunc,AfterErgo) \
3203 \
3204 product(size_t, MaxNewSize, max_uintx, \
3205 "Maximum new generation size (in bytes), max_uintx means set " \
3206 "ergonomically") \
3207 range(0, max_uintx) \
3208 \
3209 product_pd(size_t, HeapBaseMinAddress, \
3210 "OS specific low limit for heap base address") \
3211 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3212 \
3213 product(size_t, PretenureSizeThreshold, 0, \
3214 "Maximum size in bytes of objects allocated in DefNew " \
3215 "generation; zero means no maximum") \
3216 range(0, max_uintx) \
3217 \
3218 product(size_t, MinTLABSize, 2*K, \
3219 "Minimum allowed TLAB size (in bytes)") \
3220 range(1, max_uintx/2) \
3221 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3222 \
3223 product(size_t, TLABSize, 0, \
3224 "Starting TLAB size (in bytes); zero means set ergonomically") \
3225 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3226 \
3227 product(size_t, YoungPLABSize, 4096, \
3228 "Size of young gen promotion LAB's (in HeapWords)") \
3229 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3230 \
3231 product(size_t, OldPLABSize, 1024, \
3232 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3233 "of blocks to attempt to claim when refilling CMS LAB's") \
3234 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3235 \
3236 product(uintx, TLABAllocationWeight, 35, \
3237 "Allocation averaging weight") \
3238 range(0, 100) \
3239 \
3240 /* Limit the lower bound of this flag to 1 as it is used */ \
3241 /* in a division expression. */ \
3242 product(uintx, TLABWasteTargetPercent, 1, \
3243 "Percentage of Eden that can be wasted") \
3244 range(1, 100) \
3245 \
3246 product(uintx, TLABRefillWasteFraction, 64, \
3247 "Maximum TLAB waste at a refill (internal fragmentation)") \
3248 range(1, max_juint) \
3249 \
3250 product(uintx, TLABWasteIncrement, 4, \
3251 "Increment allowed waste at slow allocation") \
3252 range(0, max_jint) \
3253 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3254 \
3255 product(uintx, SurvivorRatio, 8, \
3256 "Ratio of eden/survivor space size") \
3257 range(1, max_uintx-2) \
3258 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3259 \
3260 product(uintx, NewRatio, 2, \
3261 "Ratio of old/new generation sizes") \
3262 range(0, max_uintx-1) \
3263 \
3264 product_pd(size_t, NewSizeThreadIncrease, \
3265 "Additional size added to desired new generation size per " \
3266 "non-daemon thread (in bytes)") \
3267 range(0, max_uintx) \
3268 \
3269 product_pd(size_t, MetaspaceSize, \
3270 "Initial threshold (in bytes) at which a garbage collection " \
3271 "is done to reduce Metaspace usage") \
3272 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3273 \
3274 product(size_t, MaxMetaspaceSize, max_uintx, \
3275 "Maximum size of Metaspaces (in bytes)") \
3276 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3277 \
3278 product(size_t, CompressedClassSpaceSize, 1*G, \
3279 "Maximum size of class area in Metaspace when compressed " \
3280 "class pointers are used") \
3281 range(1*M, 3*G) \
3282 \
3283 manageable(uintx, MinHeapFreeRatio, 40, \
3284 "The minimum percentage of heap free after GC to avoid expansion."\
3285 " For most GCs this applies to the old generation. In G1 and" \
3286 " ParallelGC it applies to the whole heap.") \
3287 range(0, 100) \
3288 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3289 \
3290 manageable(uintx, MaxHeapFreeRatio, 70, \
3291 "The maximum percentage of heap free after GC to avoid shrinking."\
3292 " For most GCs this applies to the old generation. In G1 and" \
3293 " ParallelGC it applies to the whole heap.") \
3294 range(0, 100) \
3295 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3296 \
3297 product(bool, ShrinkHeapInSteps, true, \
3298 "When disabled, informs the GC to shrink the java heap directly" \
3299 " to the target size at the next full GC rather than requiring" \
3300 " smaller steps during multiple full GCs.") \
3301 \
3302 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3303 "Number of milliseconds per MB of free space in the heap") \
3304 range(0, max_intx) \
3305 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3306 \
3307 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3308 "The minimum change in heap space due to GC (in bytes)") \
3309 range(0, max_uintx) \
3310 \
3311 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3312 "The minimum expansion of Metaspace (in bytes)") \
3313 range(0, max_uintx) \
3314 \
3315 product(uintx, MaxMetaspaceFreeRatio, 70, \
3316 "The maximum percentage of Metaspace free after GC to avoid " \
3317 "shrinking") \
3318 range(0, 100) \
3319 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3320 \
3321 product(uintx, MinMetaspaceFreeRatio, 40, \
3322 "The minimum percentage of Metaspace free after GC to avoid " \
3323 "expansion") \
3324 range(0, 99) \
3325 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3326 \
3327 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3328 "The maximum expansion of Metaspace without full GC (in bytes)") \
3329 range(0, max_uintx) \
3330 \
3331 product(uintx, QueuedAllocationWarningCount, 0, \
3332 "Number of times an allocation that queues behind a GC " \
3333 "will retry before printing a warning") \
3334 range(0, max_uintx) \
3335 \
3336 diagnostic(uintx, VerifyGCStartAt, 0, \
3337 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3338 range(0, max_uintx) \
3339 \
3340 diagnostic(intx, VerifyGCLevel, 0, \
3341 "Generation level at which to start +VerifyBefore/AfterGC") \
3342 range(0, 1) \
3343 \
3344 product(uintx, MaxTenuringThreshold, 15, \
3345 "Maximum value for tenuring threshold") \
3346 range(0, markOopDesc::max_age + 1) \
3347 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3348 \
3349 product(uintx, InitialTenuringThreshold, 7, \
3350 "Initial value for tenuring threshold") \
3351 range(0, markOopDesc::max_age + 1) \
3352 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3353 \
3354 product(uintx, TargetSurvivorRatio, 50, \
3355 "Desired percentage of survivor space used after scavenge") \
3356 range(0, 100) \
3357 \
3358 product(uintx, MarkSweepDeadRatio, 5, \
3359 "Percentage (0-100) of the old gen allowed as dead wood. " \
3360 "Serial mark sweep treats this as both the minimum and maximum " \
3361 "value. " \
3362 "CMS uses this value only if it falls back to mark sweep. " \
3363 "Par compact uses a variable scale based on the density of the " \
3364 "generation and treats this as the maximum value when the heap " \
3365 "is either completely full or completely empty. Par compact " \
3366 "also has a smaller default value; see arguments.cpp.") \
3367 range(0, 100) \
3368 \
3369 product(uint, MarkSweepAlwaysCompactCount, 4, \
3370 "How often should we fully compact the heap (ignoring the dead " \
3371 "space parameters)") \
3372 range(1, max_juint) \
3373 \
3374 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3375 "Delay between expansion and allocation (in milliseconds)") \
3376 \
3377 develop(uintx, GCWorkerDelayMillis, 0, \
3378 "Delay in scheduling GC workers (in milliseconds)") \
3379 \
3380 product(intx, DeferThrSuspendLoopCount, 4000, \
3381 "(Unstable) Number of times to iterate in safepoint loop " \
3382 "before blocking VM threads ") \
3383 range(-1, max_jint-1) \
3384 \
3385 product(intx, DeferPollingPageLoopCount, -1, \
3386 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3387 "before changing safepoint polling page to RO ") \
3388 range(-1, max_jint-1) \
3389 \
3390 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3391 range(0, max_intx) \
3392 \
3393 product(bool, PSChunkLargeArrays, true, \
3394 "Process large arrays in chunks") \
3395 \
3396 product(uintx, GCDrainStackTargetSize, 64, \
3397 "Number of entries we will try to leave on the stack " \
3398 "during parallel gc") \
3399 range(0, max_juint) \
3400 \
3401 /* stack parameters */ \
3402 product_pd(intx, StackYellowPages, \
3403 "Number of yellow zone (recoverable overflows) pages of size " \
3404 "4KB. If pages are bigger yellow zone is aligned up.") \
3405 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3406 \
3407 product_pd(intx, StackRedPages, \
3408 "Number of red zone (unrecoverable overflows) pages of size " \
3409 "4KB. If pages are bigger red zone is aligned up.") \
3410 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3411 \
3412 product_pd(intx, StackReservedPages, \
3413 "Number of reserved zone (reserved to annotated methods) pages" \
3414 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3415 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3416 \
3417 product(bool, RestrictReservedStack, true, \
3418 "Restrict @ReservedStackAccess to trusted classes") \
3419 \
3420 /* greater stack shadow pages can't generate instruction to bang stack */ \
3421 product_pd(intx, StackShadowPages, \
3422 "Number of shadow zone (for overflow checking) pages of size " \
3423 "4KB. If pages are bigger shadow zone is aligned up. " \
3424 "This should exceed the depth of the VM and native call stack.") \
3425 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3426 \
3427 product_pd(intx, ThreadStackSize, \
3428 "Thread Stack Size (in Kbytes)") \
3429 range(0, (max_intx-os::vm_page_size())/(1 * K)) \
3430 \
3431 product_pd(intx, VMThreadStackSize, \
3432 "Non-Java Thread Stack Size (in Kbytes)") \
3433 range(0, max_intx/(1 * K)) \
3434 \
3435 product_pd(intx, CompilerThreadStackSize, \
3436 "Compiler Thread Stack Size (in Kbytes)") \
3437 range(0, max_intx/(1 * K)) \
3438 \
3439 develop_pd(size_t, JVMInvokeMethodSlack, \
3440 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3441 \
3442 /* code cache parameters */ \
3443 /* ppc64/tiered compilation has large code-entry alignment. */ \
3444 develop(uintx, CodeCacheSegmentSize, \
3445 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \
3446 "Code cache segment size (in bytes) - smallest unit of " \
3447 "allocation") \
3448 range(1, 1024) \
3449 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3450 \
3451 develop_pd(intx, CodeEntryAlignment, \
3452 "Code entry alignment for generated code (in bytes)") \
3453 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3454 \
3455 product_pd(intx, OptoLoopAlignment, \
3456 "Align inner loops to zero relative to this modulus") \
3457 range(1, 16) \
3458 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3459 \
3460 product_pd(uintx, InitialCodeCacheSize, \
3461 "Initial code cache size (in bytes)") \
3462 range(0, max_uintx) \
3463 \
3464 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3465 "Minimum code cache size (in bytes) required to start VM.") \
3466 range(0, max_uintx) \
3467 \
3468 product(bool, SegmentedCodeCache, false, \
3469 "Use a segmented code cache") \
3470 \
3471 product_pd(uintx, ReservedCodeCacheSize, \
3472 "Reserved code cache size (in bytes) - maximum code cache size") \
3473 range(0, max_uintx) \
3474 \
3475 product_pd(uintx, NonProfiledCodeHeapSize, \
3476 "Size of code heap with non-profiled methods (in bytes)") \
3477 range(0, max_uintx) \
3478 \
3479 product_pd(uintx, ProfiledCodeHeapSize, \
3480 "Size of code heap with profiled methods (in bytes)") \
3481 range(0, max_uintx) \
3482 \
3483 product_pd(uintx, NonNMethodCodeHeapSize, \
3484 "Size of code heap with non-nmethods (in bytes)") \
3485 range(0, max_uintx) \
3486 \
3487 product_pd(uintx, CodeCacheExpansionSize, \
3488 "Code cache expansion size (in bytes)") \
3489 range(0, max_uintx) \
3490 \
3491 develop_pd(uintx, CodeCacheMinBlockLength, \
3492 "Minimum number of segments in a code cache block") \
3493 range(1, 100) \
3494 \
3495 notproduct(bool, ExitOnFullCodeCache, false, \
3496 "Exit the VM if we fill the code cache") \
3497 \
3498 product(bool, UseCodeCacheFlushing, true, \
3499 "Remove cold/old nmethods from the code cache") \
3500 \
3501 product(uintx, StartAggressiveSweepingAt, 10, \
3502 "Start aggressive sweeping if X[%] of the code cache is free." \
3503 "Segmented code cache: X[%] of the non-profiled heap." \
3504 "Non-segmented code cache: X[%] of the total code cache") \
3505 range(0, 100) \
3506 \
3507 /* interpreter debugging */ \
3508 develop(intx, BinarySwitchThreshold, 5, \
3509 "Minimal number of lookupswitch entries for rewriting to binary " \
3510 "switch") \
3511 \
3512 develop(intx, StopInterpreterAt, 0, \
3513 "Stop interpreter execution at specified bytecode number") \
3514 \
3515 develop(intx, TraceBytecodesAt, 0, \
3516 "Trace bytecodes starting with specified bytecode number") \
3517 \
3518 /* compiler interface */ \
3519 develop(intx, CIStart, 0, \
3520 "The id of the first compilation to permit") \
3521 \
3522 develop(intx, CIStop, max_jint, \
3523 "The id of the last compilation to permit") \
3524 \
3525 develop(intx, CIStartOSR, 0, \
3526 "The id of the first osr compilation to permit " \
3527 "(CICountOSR must be on)") \
3528 \
3529 develop(intx, CIStopOSR, max_jint, \
3530 "The id of the last osr compilation to permit " \
3531 "(CICountOSR must be on)") \
3532 \
3533 develop(intx, CIBreakAtOSR, -1, \
3534 "The id of osr compilation to break at") \
3535 \
3536 develop(intx, CIBreakAt, -1, \
3537 "The id of compilation to break at") \
3538 \
3539 product(ccstrlist, CompileOnly, "", \
3540 "List of methods (pkg/class.name) to restrict compilation to") \
3541 \
3542 product(ccstr, CompileCommandFile, NULL, \
3543 "Read compiler commands from this file [.hotspot_compiler]") \
3544 \
3545 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3546 "Read compiler directives from this file") \
3547 \
3548 product(ccstrlist, CompileCommand, "", \
3549 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3550 \
3551 develop(bool, ReplayCompiles, false, \
3552 "Enable replay of compilations from ReplayDataFile") \
3553 \
3554 product(ccstr, ReplayDataFile, NULL, \
3555 "File containing compilation replay information" \
3556 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3557 \
3558 product(ccstr, InlineDataFile, NULL, \
3559 "File containing inlining replay information" \
3560 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3561 \
3562 develop(intx, ReplaySuppressInitializers, 2, \
3563 "Control handling of class initialization during replay: " \
3564 "0 - don't do anything special; " \
3565 "1 - treat all class initializers as empty; " \
3566 "2 - treat class initializers for application classes as empty; " \
3567 "3 - allow all class initializers to run during bootstrap but " \
3568 " pretend they are empty after starting replay") \
3569 range(0, 3) \
3570 \
3571 develop(bool, ReplayIgnoreInitErrors, false, \
3572 "Ignore exceptions thrown during initialization for replay") \
3573 \
3574 product(bool, DumpReplayDataOnError, true, \
3575 "Record replay data for crashing compiler threads") \
3576 \
3577 product(bool, CICompilerCountPerCPU, false, \
3578 "1 compiler thread for log(N CPUs)") \
3579 \
3580 develop(intx, CIFireOOMAt, -1, \
3581 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3582 "(non-negative value throws OOM after this many CI accesses " \
3583 "in each compile)") \
3584 notproduct(intx, CICrashAt, -1, \
3585 "id of compilation to trigger assert in compiler thread for " \
3586 "the purpose of testing, e.g. generation of replay data") \
3587 notproduct(bool, CIObjectFactoryVerify, false, \
3588 "enable potentially expensive verification in ciObjectFactory") \
3589 \
3590 /* Priorities */ \
3591 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3592 \
3593 product(intx, ThreadPriorityPolicy, 0, \
3594 "0 : Normal. "\
3595 " VM chooses priorities that are appropriate for normal "\
3596 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3597 " to normal native priority. Java priorities below " \
3598 " NORM_PRIORITY map to lower native priority values. On "\
3599 " Windows applications are allowed to use higher native "\
3600 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3601 " not use the highest possible native priority, "\
3602 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3603 " system threads. On Linux thread priorities are ignored "\
3604 " because the OS does not support static priority in "\
3605 " SCHED_OTHER scheduling class which is the only choice for "\
3606 " non-root, non-realtime applications. "\
3607 "1 : Aggressive. "\
3608 " Java thread priorities map over to the entire range of "\
3609 " native thread priorities. Higher Java thread priorities map "\
3610 " to higher native thread priorities. This policy should be "\
3611 " used with care, as sometimes it can cause performance "\
3612 " degradation in the application and/or the entire system. On "\
3613 " Linux this policy requires root privilege.") \
3614 range(0, 1) \
3615 \
3616 product(bool, ThreadPriorityVerbose, false, \
3617 "Print priority changes") \
3618 \
3619 product(intx, CompilerThreadPriority, -1, \
3620 "The native priority at which compiler threads should run " \
3621 "(-1 means no change)") \
3622 range(min_jint, max_jint) \
3623 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3624 \
3625 product(intx, VMThreadPriority, -1, \
3626 "The native priority at which the VM thread should run " \
3627 "(-1 means no change)") \
3628 range(-1, 127) \
3629 \
3630 product(bool, CompilerThreadHintNoPreempt, true, \
3631 "(Solaris only) Give compiler threads an extra quanta") \
3632 \
3633 product(bool, VMThreadHintNoPreempt, false, \
3634 "(Solaris only) Give VM thread an extra quanta") \
3635 \
3636 product(intx, JavaPriority1_To_OSPriority, -1, \
3637 "Map Java priorities to OS priorities") \
3638 range(-1, 127) \
3639 \
3640 product(intx, JavaPriority2_To_OSPriority, -1, \
3641 "Map Java priorities to OS priorities") \
3642 range(-1, 127) \
3643 \
3644 product(intx, JavaPriority3_To_OSPriority, -1, \
3645 "Map Java priorities to OS priorities") \
3646 range(-1, 127) \
3647 \
3648 product(intx, JavaPriority4_To_OSPriority, -1, \
3649 "Map Java priorities to OS priorities") \
3650 range(-1, 127) \
3651 \
3652 product(intx, JavaPriority5_To_OSPriority, -1, \
3653 "Map Java priorities to OS priorities") \
3654 range(-1, 127) \
3655 \
3656 product(intx, JavaPriority6_To_OSPriority, -1, \
3657 "Map Java priorities to OS priorities") \
3658 range(-1, 127) \
3659 \
3660 product(intx, JavaPriority7_To_OSPriority, -1, \
3661 "Map Java priorities to OS priorities") \
3662 range(-1, 127) \
3663 \
3664 product(intx, JavaPriority8_To_OSPriority, -1, \
3665 "Map Java priorities to OS priorities") \
3666 range(-1, 127) \
3667 \
3668 product(intx, JavaPriority9_To_OSPriority, -1, \
3669 "Map Java priorities to OS priorities") \
3670 range(-1, 127) \
3671 \
3672 product(intx, JavaPriority10_To_OSPriority,-1, \
3673 "Map Java priorities to OS priorities") \
3674 range(-1, 127) \
3675 \
3676 experimental(bool, UseCriticalJavaThreadPriority, false, \
3677 "Java thread priority 10 maps to critical scheduling priority") \
3678 \
3679 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3680 "Compiler thread(s) run at critical scheduling priority") \
3681 \
3682 experimental(bool, UseCriticalCMSThreadPriority, false, \
3683 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3684 \
3685 /* compiler debugging */ \
3686 notproduct(intx, CompileTheWorldStartAt, 1, \
3687 "First class to consider when using +CompileTheWorld") \
3688 \
3689 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3690 "Last class to consider when using +CompileTheWorld") \
3691 \
3692 develop(intx, NewCodeParameter, 0, \
3693 "Testing Only: Create a dedicated integer parameter before " \
3694 "putback") \
3695 \
3696 /* new oopmap storage allocation */ \
3697 develop(intx, MinOopMapAllocation, 8, \
3698 "Minimum number of OopMap entries in an OopMapSet") \
3699 \
3700 /* Background Compilation */ \
3701 develop(intx, LongCompileThreshold, 50, \
3702 "Used with +TraceLongCompiles") \
3703 \
3704 /* recompilation */ \
3705 product_pd(intx, CompileThreshold, \
3706 "number of interpreted method invocations before (re-)compiling") \
3707 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3708 \
3709 product(double, CompileThresholdScaling, 1.0, \
3710 "Factor to control when first compilation happens " \
3711 "(both with and without tiered compilation): " \
3712 "values greater than 1.0 delay counter overflow, " \
3713 "values between 0 and 1.0 rush counter overflow, " \
3714 "value of 1.0 leaves compilation thresholds unchanged " \
3715 "value of 0.0 is equivalent to -Xint. " \
3716 "" \
3717 "Flag can be set as per-method option. " \
3718 "If a value is specified for a method, compilation thresholds " \
3719 "for that method are scaled by both the value of the global flag "\
3720 "and the value of the per-method flag.") \
3721 range(0.0, DBL_MAX) \
3722 \
3723 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3724 "Interpreter (tier 0) invocation notification frequency") \
3725 range(0, 30) \
3726 \
3727 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3728 "C1 without MDO (tier 2) invocation notification frequency") \
3729 range(0, 30) \
3730 \
3731 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3732 "C1 with MDO profiling (tier 3) invocation notification " \
3733 "frequency") \
3734 range(0, 30) \
3735 \
3736 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3737 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3738 range(0, 30) \
3739 \
3740 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3741 "Interpreter (tier 0) invocation notification frequency") \
3742 range(0, 30) \
3743 \
3744 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3745 "C1 without MDO (tier 2) invocation notification frequency") \
3746 range(0, 30) \
3747 \
3748 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3749 "C1 with MDO profiling (tier 3) invocation notification " \
3750 "frequency") \
3751 range(0, 30) \
3752 \
3753 product(intx, Tier2CompileThreshold, 0, \
3754 "threshold at which tier 2 compilation is invoked") \
3755 range(0, max_jint) \
3756 \
3757 product(intx, Tier2BackEdgeThreshold, 0, \
3758 "Back edge threshold at which tier 2 compilation is invoked") \
3759 range(0, max_jint) \
3760 \
3761 product(intx, Tier3InvocationThreshold, 200, \
3762 "Compile if number of method invocations crosses this " \
3763 "threshold") \
3764 range(0, max_jint) \
3765 \
3766 product(intx, Tier3MinInvocationThreshold, 100, \
3767 "Minimum invocation to compile at tier 3") \
3768 range(0, max_jint) \
3769 \
3770 product(intx, Tier3CompileThreshold, 2000, \
3771 "Threshold at which tier 3 compilation is invoked (invocation " \
3772 "minimum must be satisfied)") \
3773 range(0, max_jint) \
3774 \
3775 product(intx, Tier3BackEdgeThreshold, 60000, \
3776 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3777 range(0, max_jint) \
3778 \
3779 product(intx, Tier4InvocationThreshold, 5000, \
3780 "Compile if number of method invocations crosses this " \
3781 "threshold") \
3782 range(0, max_jint) \
3783 \
3784 product(intx, Tier4MinInvocationThreshold, 600, \
3785 "Minimum invocation to compile at tier 4") \
3786 range(0, max_jint) \
3787 \
3788 product(intx, Tier4CompileThreshold, 15000, \
3789 "Threshold at which tier 4 compilation is invoked (invocation " \
3790 "minimum must be satisfied") \
3791 range(0, max_jint) \
3792 \
3793 product(intx, Tier4BackEdgeThreshold, 40000, \
3794 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3795 range(0, max_jint) \
3796 \
3797 product(intx, Tier3DelayOn, 5, \
3798 "If C2 queue size grows over this amount per compiler thread " \
3799 "stop compiling at tier 3 and start compiling at tier 2") \
3800 range(0, max_jint) \
3801 \
3802 product(intx, Tier3DelayOff, 2, \
3803 "If C2 queue size is less than this amount per compiler thread " \
3804 "allow methods compiled at tier 2 transition to tier 3") \
3805 range(0, max_jint) \
3806 \
3807 product(intx, Tier3LoadFeedback, 5, \
3808 "Tier 3 thresholds will increase twofold when C1 queue size " \
3809 "reaches this amount per compiler thread") \
3810 range(0, max_jint) \
3811 \
3812 product(intx, Tier4LoadFeedback, 3, \
3813 "Tier 4 thresholds will increase twofold when C2 queue size " \
3814 "reaches this amount per compiler thread") \
3815 range(0, max_jint) \
3816 \
3817 product(intx, TieredCompileTaskTimeout, 50, \
3818 "Kill compile task if method was not used within " \
3819 "given timeout in milliseconds") \
3820 range(0, max_intx) \
3821 \
3822 product(intx, TieredStopAtLevel, 4, \
3823 "Stop at given compilation level") \
3824 range(0, 4) \
3825 \
3826 product(intx, Tier0ProfilingStartPercentage, 200, \
3827 "Start profiling in interpreter if the counters exceed tier 3 " \
3828 "thresholds by the specified percentage") \
3829 range(0, max_jint) \
3830 \
3831 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3832 "Increase the compile threshold for C1 compilation if the code " \
3833 "cache is filled by the specified percentage") \
3834 range(0, 99) \
3835 \
3836 product(intx, TieredRateUpdateMinTime, 1, \
3837 "Minimum rate sampling interval (in milliseconds)") \
3838 range(0, max_intx) \
3839 \
3840 product(intx, TieredRateUpdateMaxTime, 25, \
3841 "Maximum rate sampling interval (in milliseconds)") \
3842 range(0, max_intx) \
3843 \
3844 product_pd(bool, TieredCompilation, \
3845 "Enable tiered compilation") \
3846 \
3847 product(bool, PrintTieredEvents, false, \
3848 "Print tiered events notifications") \
3849 \
3850 product_pd(intx, OnStackReplacePercentage, \
3851 "NON_TIERED number of method invocations/branches (expressed as " \
3852 "% of CompileThreshold) before (re-)compiling OSR code") \
3853 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3854 \
3855 product(intx, InterpreterProfilePercentage, 33, \
3856 "NON_TIERED number of method invocations/branches (expressed as " \
3857 "% of CompileThreshold) before profiling in the interpreter") \
3858 range(0, 100) \
3859 \
3860 develop(intx, MaxRecompilationSearchLength, 10, \
3861 "The maximum number of frames to inspect when searching for " \
3862 "recompilee") \
3863 \
3864 develop(intx, MaxInterpretedSearchLength, 3, \
3865 "The maximum number of interpreted frames to skip when searching "\
3866 "for recompilee") \
3867 \
3868 develop(intx, DesiredMethodLimit, 8000, \
3869 "The desired maximum method size (in bytecodes) after inlining") \
3870 \
3871 develop(intx, HugeMethodLimit, 8000, \
3872 "Don't compile methods larger than this if " \
3873 "+DontCompileHugeMethods") \
3874 \
3875 /* New JDK 1.4 reflection implementation */ \
3876 \
3877 develop(intx, FastSuperclassLimit, 8, \
3878 "Depth of hardwired instanceof accelerator array") \
3879 \
3880 /* Properties for Java libraries */ \
3881 \
3882 product(uint64_t, MaxDirectMemorySize, 0, \
3883 "Maximum total size of NIO direct-buffer allocations") \
3884 range(0, max_jlong) \
3885 \
3886 /* Flags used for temporary code during development */ \
3887 \
3888 diagnostic(bool, UseNewCode, false, \
3889 "Testing Only: Use the new version while testing") \
3890 \
3891 diagnostic(bool, UseNewCode2, false, \
3892 "Testing Only: Use the new version while testing") \
3893 \
3894 diagnostic(bool, UseNewCode3, false, \
3895 "Testing Only: Use the new version while testing") \
3896 \
3897 /* flags for performance data collection */ \
3898 \
3899 product(bool, UsePerfData, falseInEmbedded, \
3900 "Flag to disable jvmstat instrumentation for performance testing "\
3901 "and problem isolation purposes") \
3902 \
3903 product(bool, PerfDataSaveToFile, false, \
3904 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3905 \
3906 product(ccstr, PerfDataSaveFile, NULL, \
3907 "Save PerfData memory to the specified absolute pathname. " \
3908 "The string %p in the file name (if present) " \
3909 "will be replaced by pid") \
3910 \
3911 product(intx, PerfDataSamplingInterval, 50, \
3912 "Data sampling interval (in milliseconds)") \
3913 range(PeriodicTask::min_interval, max_jint) \
3914 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3915 \
3916 develop(bool, PerfTraceDataCreation, false, \
3917 "Trace creation of Performance Data Entries") \
3918 \
3919 develop(bool, PerfTraceMemOps, false, \
3920 "Trace PerfMemory create/attach/detach calls") \
3921 \
3922 product(bool, PerfDisableSharedMem, false, \
3923 "Store performance data in standard memory") \
3924 \
3925 product(intx, PerfDataMemorySize, 32*K, \
3926 "Size of performance data memory region. Will be rounded " \
3927 "up to a multiple of the native os page size.") \
3928 range(128, 32*64*K) \
3929 \
3930 product(intx, PerfMaxStringConstLength, 1024, \
3931 "Maximum PerfStringConstant string length before truncation") \
3932 range(32, 32*K) \
3933 \
3934 product(bool, PerfAllowAtExitRegistration, false, \
3935 "Allow registration of atexit() methods") \
3936 \
3937 product(bool, PerfBypassFileSystemCheck, false, \
3938 "Bypass Win32 file system criteria checks (Windows Only)") \
3939 \
3940 product(intx, UnguardOnExecutionViolation, 0, \
3941 "Unguard page and retry on no-execute fault (Win32 only) " \
3942 "0=off, 1=conservative, 2=aggressive") \
3943 range(0, 2) \
3944 \
3945 /* Serviceability Support */ \
3946 \
3947 product(bool, ManagementServer, false, \
3948 "Create JMX Management Server") \
3949 \
3950 product(bool, DisableAttachMechanism, false, \
3951 "Disable mechanism that allows tools to attach to this VM") \
3952 \
3953 product(bool, StartAttachListener, false, \
3954 "Always start Attach Listener at VM startup") \
3955 \
3956 manageable(bool, PrintConcurrentLocks, false, \
3957 "Print java.util.concurrent locks in thread dump") \
3958 \
3959 product(bool, TransmitErrorReport, false, \
3960 "Enable error report transmission on erroneous termination") \
3961 \
3962 product(ccstr, ErrorReportServer, NULL, \
3963 "Override built-in error report server address") \
3964 \
3965 /* Shared spaces */ \
3966 \
3967 product(bool, UseSharedSpaces, true, \
3968 "Use shared spaces for metadata") \
3969 \
3970 product(bool, VerifySharedSpaces, false, \
3971 "Verify shared spaces (false for default archive, true for " \
3972 "archive specified by -XX:SharedArchiveFile)") \
3973 \
3974 product(bool, RequireSharedSpaces, false, \
3975 "Require shared spaces for metadata") \
3976 \
3977 product(bool, DumpSharedSpaces, false, \
3978 "Special mode: JVM reads a class list, loads classes, builds " \
3979 "shared spaces, and dumps the shared spaces to a file to be " \
3980 "used in future JVM runs") \
3981 \
3982 product(bool, PrintSharedSpaces, false, \
3983 "Print usage of shared spaces") \
3984 \
3985 product(bool, PrintSharedArchiveAndExit, false, \
3986 "Print shared archive file contents") \
3987 \
3988 product(bool, PrintSharedDictionary, false, \
3989 "If PrintSharedArchiveAndExit is true, also print the shared " \
3990 "dictionary") \
3991 \
3992 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \
3993 "Size of read-write space for metadata (in bytes)") \
3994 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \
3995 constraint(SharedReadWriteSizeConstraintFunc,AfterErgo) \
3996 \
3997 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \
3998 "Size of read-only space for metadata (in bytes)") \
3999 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \
4000 constraint(SharedReadOnlySizeConstraintFunc,AfterErgo) \
4001 \
4002 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \
4003 "Size of the shared miscellaneous data area (in bytes)") \
4004 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \
4005 constraint(SharedMiscDataSizeConstraintFunc,AfterErgo) \
4006 \
4007 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \
4008 "Size of the shared miscellaneous code area (in bytes)") \
4009 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \
4010 constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo) \
4011 \
4012 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
4013 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4014 "Address to allocate shared memory region for class data") \
4015 range(0, SIZE_MAX) \
4016 \
4017 product(uintx, SharedSymbolTableBucketSize, 4, \
4018 "Average number of symbols per bucket in shared table") \
4019 range(2, 246) \
4020 \
4021 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4022 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4023 "classes. Just exclude them from the shared dictionary.") \
4024 \
4025 diagnostic(bool, PrintMethodHandleStubs, false, \
4026 "Print generated stub code for method handles") \
4027 \
4028 develop(bool, TraceMethodHandles, false, \
4029 "trace internal method handle operations") \
4030 \
4031 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4032 "perform extra checks when constructing method handles") \
4033 \
4034 diagnostic(bool, ShowHiddenFrames, false, \
4035 "show method handle implementation frames (usually hidden)") \
4036 \
4037 experimental(bool, TrustFinalNonStaticFields, false, \
4038 "trust final non-static declarations for constant folding") \
4039 \
4040 diagnostic(bool, FoldStableValues, true, \
4041 "Optimize loads from stable fields (marked w/ @Stable)") \
4042 \
4043 develop(bool, TraceInvokeDynamic, false, \
4044 "trace internal invoke dynamic operations") \
4045 \
4046 diagnostic(bool, PauseAtStartup, false, \
4047 "Causes the VM to pause at startup time and wait for the pause " \
4048 "file to be removed (default: ./vm.paused.<pid>)") \
4049 \
4050 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4051 "The file to create and for whose removal to await when pausing " \
4052 "at startup. (default: ./vm.paused.<pid>)") \
4053 \
4054 diagnostic(bool, PauseAtExit, false, \
4055 "Pause and wait for keypress on exit if a debugger is attached") \
4056 \
4057 product(bool, ExtendedDTraceProbes, false, \
4058 "Enable performance-impacting dtrace probes") \
4059 \
4060 product(bool, DTraceMethodProbes, false, \
4061 "Enable dtrace probes for method-entry and method-exit") \
4062 \
4063 product(bool, DTraceAllocProbes, false, \
4064 "Enable dtrace probes for object allocation") \
4065 \
4066 product(bool, DTraceMonitorProbes, false, \
4067 "Enable dtrace probes for monitor events") \
4068 \
4069 product(bool, RelaxAccessControlCheck, false, \
4070 "Relax the access control checks in the verifier") \
4071 \
4072 product(uintx, StringTableSize, defaultStringTableSize, \
4073 "Number of buckets in the interned String table") \
4074 range(minimumStringTableSize, 111*defaultStringTableSize) \
4075 \
4076 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4077 "Number of buckets in the JVM internal Symbol table") \
4078 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4079 \
4080 product(bool, UseStringDeduplication, false, \
4081 "Use string deduplication") \
4082 \
4083 product(uintx, StringDeduplicationAgeThreshold, 3, \
4084 "A string must reach this age (or be promoted to an old region) " \
4085 "to be considered for deduplication") \
4086 range(1, markOopDesc::max_age) \
4087 \
4088 diagnostic(bool, StringDeduplicationResizeALot, false, \
4089 "Force table resize every time the table is scanned") \
4090 \
4091 diagnostic(bool, StringDeduplicationRehashALot, false, \
4092 "Force table rehash every time the table is scanned") \
4093 \
4094 diagnostic(bool, WhiteBoxAPI, false, \
4095 "Enable internal testing APIs") \
4096 \
4097 experimental(intx, SurvivorAlignmentInBytes, 0, \
4098 "Default survivor space alignment in bytes") \
4099 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4100 \
4101 product(bool , AllowNonVirtualCalls, false, \
4102 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4103 \
4104 product(ccstr, DumpLoadedClassList, NULL, \
4105 "Dump the names all loaded classes, that could be stored into " \
4106 "the CDS archive, in the specified file") \
4107 \
4108 product(ccstr, SharedClassListFile, NULL, \
4109 "Override the default CDS class list") \
4110 \
4111 diagnostic(ccstr, SharedArchiveFile, NULL, \
4112 "Override the default location of the CDS archive file") \
4113 \
4114 product(ccstr, ExtraSharedClassListFile, NULL, \
4115 "Extra classlist for building the CDS archive file") \
4116 \
4117 experimental(size_t, ArrayAllocatorMallocLimit, \
4118 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4119 "Allocation less than this value will be allocated " \
4120 "using malloc. Larger allocations will use mmap.") \
4121 \
4122 experimental(bool, AlwaysAtomicAccesses, false, \
4123 "Accesses to all variables should always be atomic") \
4124 \
4125 product(bool, EnableTracing, false, \
4126 "Enable event-based tracing") \
4127 \
4128 product(bool, UseLockedTracing, false, \
4129 "Use locked-tracing when doing event-based tracing") \
4130 \
4131 diagnostic(bool, UseUnalignedAccesses, false, \
4132 "Use unaligned memory accesses in Unsafe") \
4133 \
4134 product_pd(bool, PreserveFramePointer, \
4135 "Use the FP register for holding the frame pointer " \
4136 "and not as a general purpose register.") \
4137 \
4138 diagnostic(bool, CheckIntrinsics, true, \
4139 "When a class C is loaded, check that " \
4140 "(1) all intrinsics defined by the VM for class C are present "\
4141 "in the loaded class file and are marked with the " \
4142 "@HotSpotIntrinsicCandidate annotation, that " \
4143 "(2) there is an intrinsic registered for all loaded methods " \
4144 "that are annotated with the @HotSpotIntrinsicCandidate " \
4145 "annotation, and that " \
4146 "(3) no orphan methods exist for class C (i.e., methods for " \
4147 "which the VM declares an intrinsic but that are not declared "\
4148 "in the loaded class C. " \
4149 "Check (3) is available only in debug builds.") \
4150 \
4151 develop_pd(intx, InitArrayShortSize, \
4152 "Threshold small size (in bytes) for clearing arrays. " \
4153 "Anything this size or smaller may get converted to discrete " \
4154 "scalar stores.") \
4155 range(0, max_intx) \
4156 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
4157 \
4158 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4159 "Disable backwards compatibility for compile commands.") \
4160 \
4161 diagnostic(bool, CompilerDirectivesPrint, false, \
4162 "Print compiler directives on installation.") \
4163 diagnostic(int, CompilerDirectivesLimit, 50, \
4164 "Limit on number of compiler directives.")
4165
4166
4167 /*
4168 * Macros for factoring of globals
4169 */
4170
4171 // Interface macros
4172 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4173 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4174 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4175 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4176 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4177 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4178 #ifdef PRODUCT
4179 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4180 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4181 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4182 #else
4183 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4184 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4185 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4186 #endif // PRODUCT
4187 // Special LP64 flags, product only needed for now.
4188 #ifdef _LP64
4189 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4190 #else
4191 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4192 #endif // _LP64
4193
4194 // Implementation macros
4195 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4196 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4197 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4198 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4199 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4200 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4201 #ifdef PRODUCT
4202 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4203 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4204 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4205 #else
4206 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4207 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4208 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4209 #endif // PRODUCT
4210 #ifdef _LP64
4211 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4212 #else
4213 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4214 #endif // _LP64
4215
4216 // Only materialize src code for range checking when required, ignore otherwise
4217 #define IGNORE_RANGE(a, b)
4218 // Only materialize src code for contraint checking when required, ignore otherwise
4219 #define IGNORE_CONSTRAINT(func,type)
4220
4221 #define IGNORE_WRITEABLE(type)
4222
4223 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4224 DECLARE_PD_DEVELOPER_FLAG, \
4225 DECLARE_PRODUCT_FLAG, \
4226 DECLARE_PD_PRODUCT_FLAG, \
4227 DECLARE_DIAGNOSTIC_FLAG, \
4228 DECLARE_EXPERIMENTAL_FLAG, \
4229 DECLARE_NOTPRODUCT_FLAG, \
4230 DECLARE_MANAGEABLE_FLAG, \
4231 DECLARE_PRODUCT_RW_FLAG, \
4232 DECLARE_LP64_PRODUCT_FLAG, \
4233 IGNORE_RANGE, \
4234 IGNORE_CONSTRAINT, \
4235 IGNORE_WRITEABLE)
4236
4237 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4238 DECLARE_PD_DEVELOPER_FLAG, \
4239 DECLARE_PRODUCT_FLAG, \
4240 DECLARE_PD_PRODUCT_FLAG, \
4241 DECLARE_DIAGNOSTIC_FLAG, \
4242 DECLARE_NOTPRODUCT_FLAG, \
4243 IGNORE_RANGE, \
4244 IGNORE_CONSTRAINT, \
4245 IGNORE_WRITEABLE)
4246
4247 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4248 DECLARE_PRODUCT_FLAG, \
4249 DECLARE_DIAGNOSTIC_FLAG, \
4250 DECLARE_EXPERIMENTAL_FLAG, \
4251 DECLARE_NOTPRODUCT_FLAG, \
4252 IGNORE_RANGE, \
4253 IGNORE_CONSTRAINT, \
4254 IGNORE_WRITEABLE)
4255
4256 // Extensions
4257
4258 #include "runtime/globals_ext.hpp"
4259
4260 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP