1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include <float.h>
29 #include "utilities/debug.hpp"
30 #include <float.h> // for DBL_MAX
31
32 // use this for flags that are true per default in the tiered build
33 // but false in non-tiered builds, and vice versa
34 #ifdef TIERED
35 #define trueInTiered true
36 #define falseInTiered false
37 #else
38 #define trueInTiered false
39 #define falseInTiered true
40 #endif
41
42 #ifdef TARGET_ARCH_x86
43 # include "globals_x86.hpp"
44 #endif
45 #ifdef TARGET_ARCH_sparc
46 # include "globals_sparc.hpp"
47 #endif
48 #ifdef TARGET_ARCH_zero
49 # include "globals_zero.hpp"
50 #endif
51 #ifdef TARGET_ARCH_arm
52 # include "globals_arm.hpp"
53 #endif
54 #ifdef TARGET_ARCH_ppc
55 # include "globals_ppc.hpp"
56 #endif
57 #ifdef TARGET_ARCH_aarch64
58 # include "globals_aarch64.hpp"
59 #endif
60 #ifdef TARGET_OS_FAMILY_linux
61 # include "globals_linux.hpp"
62 #endif
63 #ifdef TARGET_OS_FAMILY_solaris
64 # include "globals_solaris.hpp"
65 #endif
66 #ifdef TARGET_OS_FAMILY_windows
67 # include "globals_windows.hpp"
68 #endif
69 #ifdef TARGET_OS_FAMILY_aix
70 # include "globals_aix.hpp"
71 #endif
72 #ifdef TARGET_OS_FAMILY_bsd
73 # include "globals_bsd.hpp"
74 #endif
75 #ifdef TARGET_OS_ARCH_linux_x86
76 # include "globals_linux_x86.hpp"
77 #endif
78 #ifdef TARGET_OS_ARCH_linux_sparc
79 # include "globals_linux_sparc.hpp"
80 #endif
81 #ifdef TARGET_OS_ARCH_linux_zero
82 # include "globals_linux_zero.hpp"
83 #endif
84 #ifdef TARGET_OS_ARCH_solaris_x86
85 # include "globals_solaris_x86.hpp"
86 #endif
87 #ifdef TARGET_OS_ARCH_solaris_sparc
88 # include "globals_solaris_sparc.hpp"
89 #endif
90 #ifdef TARGET_OS_ARCH_windows_x86
91 # include "globals_windows_x86.hpp"
92 #endif
93 #ifdef TARGET_OS_ARCH_linux_arm
94 # include "globals_linux_arm.hpp"
95 #endif
96 #ifdef TARGET_OS_ARCH_linux_ppc
97 # include "globals_linux_ppc.hpp"
98 #endif
99 #ifdef TARGET_OS_ARCH_linux_aarch64
100 # include "globals_linux_aarch64.hpp"
101 #endif
102 #ifdef TARGET_OS_ARCH_aix_ppc
103 # include "globals_aix_ppc.hpp"
104 #endif
105 #ifdef TARGET_OS_ARCH_bsd_x86
106 # include "globals_bsd_x86.hpp"
107 #endif
108 #ifdef TARGET_OS_ARCH_bsd_zero
109 # include "globals_bsd_zero.hpp"
110 #endif
111 #ifdef COMPILER1
112 #ifdef TARGET_ARCH_x86
113 # include "c1_globals_x86.hpp"
114 #endif
115 #ifdef TARGET_ARCH_sparc
116 # include "c1_globals_sparc.hpp"
117 #endif
118 #ifdef TARGET_ARCH_arm
119 # include "c1_globals_arm.hpp"
120 #endif
121 #ifdef TARGET_ARCH_aarch64
122 # include "c1_globals_aarch64.hpp"
123 #endif
124 #ifdef TARGET_OS_FAMILY_linux
125 # include "c1_globals_linux.hpp"
126 #endif
127 #ifdef TARGET_OS_FAMILY_solaris
128 # include "c1_globals_solaris.hpp"
129 #endif
130 #ifdef TARGET_OS_FAMILY_windows
131 # include "c1_globals_windows.hpp"
132 #endif
133 #ifdef TARGET_OS_FAMILY_aix
134 # include "c1_globals_aix.hpp"
135 #endif
136 #ifdef TARGET_OS_FAMILY_bsd
137 # include "c1_globals_bsd.hpp"
138 #endif
139 #ifdef TARGET_ARCH_ppc
140 # include "c1_globals_ppc.hpp"
141 #endif
142 #endif
143 #ifdef COMPILER2
144 #ifdef TARGET_ARCH_x86
145 # include "c2_globals_x86.hpp"
146 #endif
147 #ifdef TARGET_ARCH_sparc
148 # include "c2_globals_sparc.hpp"
149 #endif
150 #ifdef TARGET_ARCH_arm
151 # include "c2_globals_arm.hpp"
152 #endif
153 #ifdef TARGET_ARCH_ppc
154 # include "c2_globals_ppc.hpp"
155 #endif
156 #ifdef TARGET_ARCH_aarch64
157 # include "c2_globals_aarch64.hpp"
158 #endif
159 #ifdef TARGET_OS_FAMILY_linux
160 # include "c2_globals_linux.hpp"
161 #endif
162 #ifdef TARGET_OS_FAMILY_solaris
163 # include "c2_globals_solaris.hpp"
164 #endif
165 #ifdef TARGET_OS_FAMILY_windows
166 # include "c2_globals_windows.hpp"
167 #endif
168 #ifdef TARGET_OS_FAMILY_aix
169 # include "c2_globals_aix.hpp"
170 #endif
171 #ifdef TARGET_OS_FAMILY_bsd
172 # include "c2_globals_bsd.hpp"
173 #endif
174 #endif
175 #ifdef SHARK
176 #ifdef TARGET_ARCH_zero
177 # include "shark_globals_zero.hpp"
178 #endif
179 #endif
180
181 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
182 define_pd_global(bool, BackgroundCompilation, false);
183 define_pd_global(bool, UseTLAB, false);
184 define_pd_global(bool, CICompileOSR, false);
185 define_pd_global(bool, UseTypeProfile, false);
186 define_pd_global(bool, UseOnStackReplacement, false);
187 define_pd_global(bool, InlineIntrinsics, false);
188 define_pd_global(bool, PreferInterpreterNativeStubs, true);
189 define_pd_global(bool, ProfileInterpreter, false);
190 define_pd_global(bool, ProfileTraps, false);
191 define_pd_global(bool, TieredCompilation, false);
192
193 define_pd_global(intx, CompileThreshold, 0);
194
195 define_pd_global(intx, OnStackReplacePercentage, 0);
196 define_pd_global(bool, ResizeTLAB, false);
197 define_pd_global(intx, FreqInlineSize, 0);
198 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
199 define_pd_global(intx, InlineClassNatives, true);
200 define_pd_global(intx, InlineUnsafeOps, true);
201 define_pd_global(intx, InitialCodeCacheSize, 160*K);
202 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
203 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
204 define_pd_global(intx, ProfiledCodeHeapSize, 0);
205 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
206
207 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
208 define_pd_global(intx, CodeCacheMinBlockLength, 1);
209 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
210 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
211 define_pd_global(bool, NeverActAsServerClassMachine, true);
212 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
213 #define CI_COMPILER_COUNT 0
214 #else
215
216 #if defined(COMPILER2) || INCLUDE_JVMCI
217 #define CI_COMPILER_COUNT 2
218 #else
219 #define CI_COMPILER_COUNT 1
220 #endif // COMPILER2 || INCLUDE_JVMCI
221
222 #endif // no compilers
223
224 // string type aliases used only in this file
225 typedef const char* ccstr;
226 typedef const char* ccstrlist; // represents string arguments which accumulate
227
228 struct Flag {
229 enum Flags {
230 // value origin
231 DEFAULT = 0,
232 COMMAND_LINE = 1,
233 ENVIRON_VAR = 2,
234 CONFIG_FILE = 3,
235 MANAGEMENT = 4,
236 ERGONOMIC = 5,
237 ATTACH_ON_DEMAND = 6,
238 INTERNAL = 7,
239
240 LAST_VALUE_ORIGIN = INTERNAL,
241 VALUE_ORIGIN_BITS = 4,
242 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
243
244 // flag kind
245 KIND_PRODUCT = 1 << 4,
246 KIND_MANAGEABLE = 1 << 5,
247 KIND_DIAGNOSTIC = 1 << 6,
248 KIND_EXPERIMENTAL = 1 << 7,
249 KIND_NOT_PRODUCT = 1 << 8,
250 KIND_DEVELOP = 1 << 9,
251 KIND_PLATFORM_DEPENDENT = 1 << 10,
252 KIND_READ_WRITE = 1 << 11,
253 KIND_C1 = 1 << 12,
254 KIND_C2 = 1 << 13,
255 KIND_ARCH = 1 << 14,
256 KIND_SHARK = 1 << 15,
257 KIND_LP64_PRODUCT = 1 << 16,
258 KIND_COMMERCIAL = 1 << 17,
259 KIND_JVMCI = 1 << 18,
260
261 KIND_MASK = ~VALUE_ORIGIN_MASK
262 };
263
264 enum Error {
265 // no error
266 SUCCESS = 0,
267 // flag name is missing
268 MISSING_NAME,
269 // flag value is missing
270 MISSING_VALUE,
271 // error parsing the textual form of the value
272 WRONG_FORMAT,
273 // flag is not writeable
274 NON_WRITABLE,
275 // flag value is outside of its bounds
276 OUT_OF_BOUNDS,
277 // flag value violates its constraint
278 VIOLATES_CONSTRAINT,
279 // there is no flag with the given name
280 INVALID_FLAG,
281 // other, unspecified error related to setting the flag
282 ERR_OTHER
283 };
284
285 enum MsgType {
286 NONE = 0,
287 DIAGNOSTIC_FLAG_BUT_LOCKED,
288 EXPERIMENTAL_FLAG_BUT_LOCKED,
289 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
290 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
291 };
292
293 const char* _type;
294 const char* _name;
295 void* _addr;
296 NOT_PRODUCT(const char* _doc;)
297 Flags _flags;
298
299 // points to all Flags static array
300 static Flag* flags;
301
302 // number of flags
303 static size_t numFlags;
304
305 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
306 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
307 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
308
309 void check_writable();
310
311 bool is_bool() const;
312 bool get_bool() const;
313 void set_bool(bool value);
314
315 bool is_int() const;
316 int get_int() const;
317 void set_int(int value);
318
319 bool is_uint() const;
320 uint get_uint() const;
321 void set_uint(uint value);
322
323 bool is_intx() const;
324 intx get_intx() const;
325 void set_intx(intx value);
326
327 bool is_uintx() const;
328 uintx get_uintx() const;
329 void set_uintx(uintx value);
330
331 bool is_uint64_t() const;
332 uint64_t get_uint64_t() const;
333 void set_uint64_t(uint64_t value);
334
335 bool is_size_t() const;
336 size_t get_size_t() const;
337 void set_size_t(size_t value);
338
339 bool is_double() const;
340 double get_double() const;
341 void set_double(double value);
342
343 bool is_ccstr() const;
344 bool ccstr_accumulates() const;
345 ccstr get_ccstr() const;
346 void set_ccstr(ccstr value);
347
348 Flags get_origin();
349 void set_origin(Flags origin);
350
351 bool is_default();
352 bool is_ergonomic();
353 bool is_command_line();
354
355 bool is_product() const;
356 bool is_manageable() const;
357 bool is_diagnostic() const;
358 bool is_experimental() const;
359 bool is_notproduct() const;
360 bool is_develop() const;
361 bool is_read_write() const;
362 bool is_commercial() const;
363
364 bool is_constant_in_binary() const;
365
366 bool is_unlocker() const;
367 bool is_unlocked() const;
368 bool is_writeable() const;
369 bool is_external() const;
370
371 bool is_unlocker_ext() const;
372 bool is_unlocked_ext() const;
373 bool is_writeable_ext() const;
374 bool is_external_ext() const;
375
376 void unlock_diagnostic();
377
378 Flag::MsgType get_locked_message(char*, int) const;
379 void get_locked_message_ext(char*, int) const;
380
381 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
382 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
383 void print_kind(outputStream* st);
384 void print_as_flag(outputStream* st);
385
386 static const char* flag_error_str(Flag::Error error);
387 };
388
389 // debug flags control various aspects of the VM and are global accessible
390
391 // use FlagSetting to temporarily change some debug flag
392 // e.g. FlagSetting fs(DebugThisAndThat, true);
393 // restored to previous value upon leaving scope
394 class FlagSetting {
395 bool val;
396 bool* flag;
397 public:
398 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
399 ~FlagSetting() { *flag = val; }
400 };
401
402
403 class CounterSetting {
404 intx* counter;
405 public:
406 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
407 ~CounterSetting() { (*counter)--; }
408 };
409
410 class IntFlagSetting {
411 int val;
412 int* flag;
413 public:
414 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
415 ~IntFlagSetting() { *flag = val; }
416 };
417
418 class UIntFlagSetting {
419 uint val;
420 uint* flag;
421 public:
422 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
423 ~UIntFlagSetting() { *flag = val; }
424 };
425
426 class UIntXFlagSetting {
427 uintx val;
428 uintx* flag;
429 public:
430 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
431 ~UIntXFlagSetting() { *flag = val; }
432 };
433
434 class DoubleFlagSetting {
435 double val;
436 double* flag;
437 public:
438 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
439 ~DoubleFlagSetting() { *flag = val; }
440 };
441
442 class SizeTFlagSetting {
443 size_t val;
444 size_t* flag;
445 public:
446 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
447 ~SizeTFlagSetting() { *flag = val; }
448 };
449
450
451 class CommandLineFlags {
452 public:
453 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
454 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); }
455 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
456 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
457 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
458
459 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
460 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); }
461 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
462 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
463 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
464
465 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
466 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); }
467 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
468 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
469 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
470
471 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
472 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); }
473 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
474 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
475 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
476
477 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
478 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); }
479 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
480 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
481 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
482
483 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
484 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); }
485 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
486 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
487 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
488
489 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
490 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); }
491 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
492 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
493 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
494
495 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
496 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); }
497 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
498 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
499 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
500
501 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
502 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); }
503 // Contract: Flag will make private copy of the incoming value.
504 // Outgoing value is always malloc-ed, and caller MUST call free.
505 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
506 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
507
508 // Returns false if name is not a command line flag.
509 static bool wasSetOnCmdline(const char* name, bool* value);
510 static void printSetFlags(outputStream* out);
511
512 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
513 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
514
515 static void verify() PRODUCT_RETURN;
516 };
517
518 // use this for flags that are true by default in the debug version but
519 // false in the optimized version, and vice versa
520 #ifdef ASSERT
521 #define trueInDebug true
522 #define falseInDebug false
523 #else
524 #define trueInDebug false
525 #define falseInDebug true
526 #endif
527
528 // use this for flags that are true per default in the product build
529 // but false in development builds, and vice versa
530 #ifdef PRODUCT
531 #define trueInProduct true
532 #define falseInProduct false
533 #else
534 #define trueInProduct false
535 #define falseInProduct true
536 #endif
537
538 #ifdef JAVASE_EMBEDDED
539 #define falseInEmbedded false
540 #else
541 #define falseInEmbedded true
542 #endif
543
544 // develop flags are settable / visible only during development and are constant in the PRODUCT version
545 // product flags are always settable / visible
546 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
547
548 // A flag must be declared with one of the following types:
549 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
550 // The type "ccstr" is an alias for "const char*" and is used
551 // only in this file, because the macrology requires single-token type names.
552
553 // Note: Diagnostic options not meant for VM tuning or for product modes.
554 // They are to be used for VM quality assurance or field diagnosis
555 // of VM bugs. They are hidden so that users will not be encouraged to
556 // try them as if they were VM ordinary execution options. However, they
557 // are available in the product version of the VM. Under instruction
558 // from support engineers, VM customers can turn them on to collect
559 // diagnostic information about VM problems. To use a VM diagnostic
560 // option, you must first specify +UnlockDiagnosticVMOptions.
561 // (This master switch also affects the behavior of -Xprintflags.)
562 //
563 // experimental flags are in support of features that are not
564 // part of the officially supported product, but are available
565 // for experimenting with. They could, for example, be performance
566 // features that may not have undergone full or rigorous QA, but which may
567 // help performance in some cases and released for experimentation
568 // by the community of users and developers. This flag also allows one to
569 // be able to build a fully supported product that nonetheless also
570 // ships with some unsupported, lightly tested, experimental features.
571 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
572 // UnlockExperimentalVMOptions flag, which allows the control and
573 // modification of the experimental flags.
574 //
575 // Nota bene: neither diagnostic nor experimental options should be used casually,
576 // and they are not supported on production loads, except under explicit
577 // direction from support engineers.
578 //
579 // manageable flags are writeable external product flags.
580 // They are dynamically writeable through the JDK management interface
581 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
582 // These flags are external exported interface (see CCC). The list of
583 // manageable flags can be queried programmatically through the management
584 // interface.
585 //
586 // A flag can be made as "manageable" only if
587 // - the flag is defined in a CCC as an external exported interface.
588 // - the VM implementation supports dynamic setting of the flag.
589 // This implies that the VM must *always* query the flag variable
590 // and not reuse state related to the flag state at any given time.
591 // - you want the flag to be queried programmatically by the customers.
592 //
593 // product_rw flags are writeable internal product flags.
594 // They are like "manageable" flags but for internal/private use.
595 // The list of product_rw flags are internal/private flags which
596 // may be changed/removed in a future release. It can be set
597 // through the management interface to get/set value
598 // when the name of flag is supplied.
599 //
600 // A flag can be made as "product_rw" only if
601 // - the VM implementation supports dynamic setting of the flag.
602 // This implies that the VM must *always* query the flag variable
603 // and not reuse state related to the flag state at any given time.
604 //
605 // Note that when there is a need to support develop flags to be writeable,
606 // it can be done in the same way as product_rw.
607 //
608 // range is a macro that will expand to min and max arguments for range
609 // checking code if provided - see commandLineFlagRangeList.hpp
610 //
611 // constraint is a macro that will expand to custom function call
612 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
613 //
614
615 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
616 \
617 lp64_product(bool, UseCompressedOops, false, \
618 "Use 32-bit object references in 64-bit VM. " \
619 "lp64_product means flag is always constant in 32 bit VM") \
620 \
621 lp64_product(bool, UseCompressedClassPointers, false, \
622 "Use 32-bit class pointers in 64-bit VM. " \
623 "lp64_product means flag is always constant in 32 bit VM") \
624 \
625 notproduct(bool, CheckCompressedOops, true, \
626 "Generate checks in encoding/decoding code in debug VM") \
627 \
628 product_pd(size_t, HeapBaseMinAddress, \
629 "OS specific low limit for heap base address") \
630 \
631 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
632 "Heap allocation steps through preferred address regions to find" \
633 " where it can allocate the heap. Number of steps to take per " \
634 "region.") \
635 range(1, max_uintx) \
636 \
637 diagnostic(bool, PrintCompressedOopsMode, false, \
638 "Print compressed oops base address and encoding mode") \
639 \
640 lp64_product(intx, ObjectAlignmentInBytes, 8, \
641 "Default object alignment in bytes, 8 is minimum") \
642 range(8, 256) \
643 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
644 \
645 product(bool, AssumeMP, false, \
646 "Instruct the VM to assume multiple processors are available") \
647 \
648 /* UseMembar is theoretically a temp flag used for memory barrier */ \
649 /* removal testing. It was supposed to be removed before FCS but has */ \
650 /* been re-added (see 6401008) */ \
651 product_pd(bool, UseMembar, \
652 "(Unstable) Issues membars on thread state transitions") \
653 \
654 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
655 "Clean the chunk pool asynchronously") \
656 \
657 experimental(bool, AlwaysSafeConstructors, false, \
658 "Force safe construction, as if all fields are final.") \
659 \
660 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
661 "Enable normal processing of flags relating to field diagnostics")\
662 \
663 experimental(bool, UnlockExperimentalVMOptions, false, \
664 "Enable normal processing of flags relating to experimental " \
665 "features") \
666 \
667 product(bool, JavaMonitorsInStackTrace, true, \
668 "Print information about Java monitor locks when the stacks are" \
669 "dumped") \
670 \
671 product_pd(bool, UseLargePages, \
672 "Use large page memory") \
673 \
674 product_pd(bool, UseLargePagesIndividualAllocation, \
675 "Allocate large pages individually for better affinity") \
676 \
677 develop(bool, LargePagesIndividualAllocationInjectError, false, \
678 "Fail large pages individual allocation") \
679 \
680 product(bool, UseLargePagesInMetaspace, false, \
681 "Use large page memory in metaspace. " \
682 "Only used if UseLargePages is enabled.") \
683 \
684 develop(bool, TracePageSizes, false, \
685 "Trace page size selection and usage") \
686 \
687 product(bool, UseNUMA, false, \
688 "Use NUMA if available") \
689 \
690 product(bool, UseNUMAInterleaving, false, \
691 "Interleave memory across NUMA nodes if available") \
692 \
693 product(size_t, NUMAInterleaveGranularity, 2*M, \
694 "Granularity to use for NUMA interleaving on Windows OS") \
695 \
696 product(bool, ForceNUMA, false, \
697 "Force NUMA optimizations on single-node/UMA systems") \
698 \
699 product(uintx, NUMAChunkResizeWeight, 20, \
700 "Percentage (0-100) used to weight the current sample when " \
701 "computing exponentially decaying average for " \
702 "AdaptiveNUMAChunkSizing") \
703 range(0, 100) \
704 \
705 product(size_t, NUMASpaceResizeRate, 1*G, \
706 "Do not reallocate more than this amount per collection") \
707 \
708 product(bool, UseAdaptiveNUMAChunkSizing, true, \
709 "Enable adaptive chunk sizing for NUMA") \
710 \
711 product(bool, NUMAStats, false, \
712 "Print NUMA stats in detailed heap information") \
713 \
714 product(uintx, NUMAPageScanRate, 256, \
715 "Maximum number of pages to include in the page scan procedure") \
716 \
717 product_pd(bool, NeedsDeoptSuspend, \
718 "True for register window machines (sparc/ia64)") \
719 \
720 product(intx, UseSSE, 99, \
721 "Highest supported SSE instructions set on x86/x64") \
722 range(0, 99) \
723 \
724 product(bool, UseAES, false, \
725 "Control whether AES instructions can be used on x86/x64") \
726 \
727 product(bool, UseSHA, false, \
728 "Control whether SHA instructions can be used " \
729 "on SPARC and on ARM") \
730 \
731 product(bool, UseGHASHIntrinsics, false, \
732 "Use intrinsics for GHASH versions of crypto") \
733 \
734 product(size_t, LargePageSizeInBytes, 0, \
735 "Large page size (0 to let VM choose the page size)") \
736 \
737 product(size_t, LargePageHeapSizeThreshold, 128*M, \
738 "Use large pages if maximum heap is at least this big") \
739 \
740 product(bool, ForceTimeHighResolution, false, \
741 "Using high time resolution (for Win32 only)") \
742 \
743 develop(bool, TraceItables, false, \
744 "Trace initialization and use of itables") \
745 \
746 develop(bool, TracePcPatching, false, \
747 "Trace usage of frame::patch_pc") \
748 \
749 develop(bool, TraceJumps, false, \
750 "Trace assembly jumps in thread ring buffer") \
751 \
752 develop(bool, TraceRelocator, false, \
753 "Trace the bytecode relocator") \
754 \
755 develop(bool, TraceLongCompiles, false, \
756 "Print out every time compilation is longer than " \
757 "a given threshold") \
758 \
759 develop(bool, SafepointALot, false, \
760 "Generate a lot of safepoints. This works with " \
761 "GuaranteedSafepointInterval") \
762 \
763 product_pd(bool, BackgroundCompilation, \
764 "A thread requesting compilation is not blocked during " \
765 "compilation") \
766 \
767 product(bool, PrintVMQWaitTime, false, \
768 "Print out the waiting time in VM operation queue") \
769 \
770 develop(bool, TraceOopMapGeneration, false, \
771 "Show OopMapGeneration") \
772 \
773 product(bool, MethodFlushing, true, \
774 "Reclamation of zombie and not-entrant methods") \
775 \
776 develop(bool, VerifyStack, false, \
777 "Verify stack of each thread when it is entering a runtime call") \
778 \
779 diagnostic(bool, ForceUnreachable, false, \
780 "Make all non code cache addresses to be unreachable by " \
781 "forcing use of 64bit literal fixups") \
782 \
783 notproduct(bool, StressDerivedPointers, false, \
784 "Force scavenge when a derived pointer is detected on stack " \
785 "after rtm call") \
786 \
787 develop(bool, TraceDerivedPointers, false, \
788 "Trace traversal of derived pointers on stack") \
789 \
790 notproduct(bool, TraceCodeBlobStacks, false, \
791 "Trace stack-walk of codeblobs") \
792 \
793 product(bool, PrintJNIResolving, false, \
794 "Used to implement -v:jni") \
795 \
796 notproduct(bool, PrintRewrites, false, \
797 "Print methods that are being rewritten") \
798 \
799 product(bool, UseInlineCaches, true, \
800 "Use Inline Caches for virtual calls ") \
801 \
802 develop(bool, InlineArrayCopy, true, \
803 "Inline arraycopy native that is known to be part of " \
804 "base library DLL") \
805 \
806 develop(bool, InlineObjectHash, true, \
807 "Inline Object::hashCode() native that is known to be part " \
808 "of base library DLL") \
809 \
810 develop(bool, InlineNatives, true, \
811 "Inline natives that are known to be part of base library DLL") \
812 \
813 develop(bool, InlineMathNatives, true, \
814 "Inline SinD, CosD, etc.") \
815 \
816 develop(bool, InlineClassNatives, true, \
817 "Inline Class.isInstance, etc") \
818 \
819 develop(bool, InlineThreadNatives, true, \
820 "Inline Thread.currentThread, etc") \
821 \
822 develop(bool, InlineUnsafeOps, true, \
823 "Inline memory ops (native methods) from Unsafe") \
824 \
825 product(bool, CriticalJNINatives, true, \
826 "Check for critical JNI entry points") \
827 \
828 notproduct(bool, StressCriticalJNINatives, false, \
829 "Exercise register saving code in critical natives") \
830 \
831 product(bool, UseSSE42Intrinsics, false, \
832 "SSE4.2 versions of intrinsics") \
833 \
834 product(bool, UseAESIntrinsics, false, \
835 "Use intrinsics for AES versions of crypto") \
836 \
837 product(bool, UseSHA1Intrinsics, false, \
838 "Use intrinsics for SHA-1 crypto hash function. " \
839 "Requires that UseSHA is enabled.") \
840 \
841 product(bool, UseSHA256Intrinsics, false, \
842 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
843 "Requires that UseSHA is enabled.") \
844 \
845 product(bool, UseSHA512Intrinsics, false, \
846 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
847 "Requires that UseSHA is enabled.") \
848 \
849 product(bool, UseCRC32Intrinsics, false, \
850 "use intrinsics for java.util.zip.CRC32") \
851 \
852 product(bool, UseCRC32CIntrinsics, false, \
853 "use intrinsics for java.util.zip.CRC32C") \
854 \
855 product(bool, UseAdler32Intrinsics, false, \
856 "use intrinsics for java.util.zip.Adler32") \
857 \
858 diagnostic(ccstrlist, DisableIntrinsic, "", \
859 "do not expand intrinsics whose (internal) names appear here") \
860 \
861 develop(bool, TraceCallFixup, false, \
862 "Trace all call fixups") \
863 \
864 develop(bool, DeoptimizeALot, false, \
865 "Deoptimize at every exit from the runtime system") \
866 \
867 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
868 "A comma separated list of bcis to deoptimize at") \
869 \
870 product(bool, DeoptimizeRandom, false, \
871 "Deoptimize random frames on random exit from the runtime system")\
872 \
873 notproduct(bool, ZombieALot, false, \
874 "Create zombies (non-entrant) at exit from the runtime system") \
875 \
876 product(bool, UnlinkSymbolsALot, false, \
877 "Unlink unreferenced symbols from the symbol table at safepoints")\
878 \
879 notproduct(bool, WalkStackALot, false, \
880 "Trace stack (no print) at every exit from the runtime system") \
881 \
882 product(bool, Debugging, false, \
883 "Set when executing debug methods in debug.cpp " \
884 "(to prevent triggering assertions)") \
885 \
886 notproduct(bool, StrictSafepointChecks, trueInDebug, \
887 "Enable strict checks that safepoints cannot happen for threads " \
888 "that use No_Safepoint_Verifier") \
889 \
890 notproduct(bool, VerifyLastFrame, false, \
891 "Verify oops on last frame on entry to VM") \
892 \
893 develop(bool, TraceHandleAllocation, false, \
894 "Print out warnings when suspiciously many handles are allocated")\
895 \
896 product(bool, FailOverToOldVerifier, true, \
897 "Fail over to old verifier when split verifier fails") \
898 \
899 develop(bool, ShowSafepointMsgs, false, \
900 "Show message about safepoint synchronization") \
901 \
902 product(bool, SafepointTimeout, false, \
903 "Time out and warn or fail after SafepointTimeoutDelay " \
904 "milliseconds if failed to reach safepoint") \
905 \
906 develop(bool, DieOnSafepointTimeout, false, \
907 "Die upon failure to reach safepoint (see SafepointTimeout)") \
908 \
909 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
910 /* typically, at most a few retries are needed */ \
911 product(intx, SuspendRetryCount, 50, \
912 "Maximum retry count for an external suspend request") \
913 range(0, max_intx) \
914 \
915 product(intx, SuspendRetryDelay, 5, \
916 "Milliseconds to delay per retry (* current_retry_count)") \
917 range(0, max_intx) \
918 \
919 product(bool, AssertOnSuspendWaitFailure, false, \
920 "Assert/Guarantee on external suspend wait failure") \
921 \
922 product(bool, TraceSuspendWaitFailures, false, \
923 "Trace external suspend wait failures") \
924 \
925 product(bool, MaxFDLimit, true, \
926 "Bump the number of file descriptors to maximum in Solaris") \
927 \
928 diagnostic(bool, LogEvents, true, \
929 "Enable the various ring buffer event logs") \
930 \
931 diagnostic(uintx, LogEventsBufferEntries, 10, \
932 "Number of ring buffer event logs") \
933 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
934 \
935 product(bool, BytecodeVerificationRemote, true, \
936 "Enable the Java bytecode verifier for remote classes") \
937 \
938 product(bool, BytecodeVerificationLocal, false, \
939 "Enable the Java bytecode verifier for local classes") \
940 \
941 develop(bool, ForceFloatExceptions, trueInDebug, \
942 "Force exceptions on FP stack under/overflow") \
943 \
944 develop(bool, VerifyStackAtCalls, false, \
945 "Verify that the stack pointer is unchanged after calls") \
946 \
947 develop(bool, TraceJavaAssertions, false, \
948 "Trace java language assertions") \
949 \
950 notproduct(bool, CheckAssertionStatusDirectives, false, \
951 "Temporary - see javaClasses.cpp") \
952 \
953 notproduct(bool, PrintMallocFree, false, \
954 "Trace calls to C heap malloc/free allocation") \
955 \
956 product(bool, PrintOopAddress, false, \
957 "Always print the location of the oop") \
958 \
959 notproduct(bool, VerifyCodeCache, false, \
960 "Verify code cache on memory allocation/deallocation") \
961 \
962 develop(bool, UseMallocOnly, false, \
963 "Use only malloc/free for allocation (no resource area/arena)") \
964 \
965 develop(bool, PrintMalloc, false, \
966 "Print all malloc/free calls") \
967 \
968 develop(bool, PrintMallocStatistics, false, \
969 "Print malloc/free statistics") \
970 \
971 develop(bool, ZapResourceArea, trueInDebug, \
972 "Zap freed resource/arena space with 0xABABABAB") \
973 \
974 notproduct(bool, ZapVMHandleArea, trueInDebug, \
975 "Zap freed VM handle space with 0xBCBCBCBC") \
976 \
977 develop(bool, ZapJNIHandleArea, trueInDebug, \
978 "Zap freed JNI handle space with 0xFEFEFEFE") \
979 \
980 notproduct(bool, ZapStackSegments, trueInDebug, \
981 "Zap allocated/freed stack segments with 0xFADFADED") \
982 \
983 develop(bool, ZapUnusedHeapArea, trueInDebug, \
984 "Zap unused heap space with 0xBAADBABE") \
985 \
986 develop(bool, CheckZapUnusedHeapArea, false, \
987 "Check zapping of unused heap space") \
988 \
989 develop(bool, ZapFillerObjects, trueInDebug, \
990 "Zap filler objects with 0xDEAFBABE") \
991 \
992 develop(bool, PrintVMMessages, true, \
993 "Print VM messages on console") \
994 \
995 diagnostic(bool, VerboseVerification, false, \
996 "Display detailed verification details") \
997 \
998 notproduct(uintx, ErrorHandlerTest, 0, \
999 "If > 0, provokes an error after VM initialization; the value " \
1000 "determines which error to provoke. See test_error_handler() " \
1001 "in debug.cpp.") \
1002 \
1003 notproduct(uintx, TestCrashInErrorHandler, 0, \
1004 "If > 0, provokes an error inside VM error handler (a secondary " \
1005 "crash). see test_error_handler() in debug.cpp.") \
1006 \
1007 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1008 "If true, tests SafeFetch inside error handler.") \
1009 \
1010 develop(bool, Verbose, false, \
1011 "Print additional debugging information from other modes") \
1012 \
1013 develop(bool, PrintMiscellaneous, false, \
1014 "Print uncategorized debugging information (requires +Verbose)") \
1015 \
1016 develop(bool, WizardMode, false, \
1017 "Print much more debugging information") \
1018 \
1019 product(bool, ShowMessageBoxOnError, false, \
1020 "Keep process alive on VM fatal error") \
1021 \
1022 product(bool, CreateCoredumpOnCrash, true, \
1023 "Create core/mini dump on VM fatal error") \
1024 \
1025 product(uintx, ErrorLogTimeout, 2 * 60, \
1026 "Timeout, in seconds, to limit the time spent on writing an " \
1027 "error log in case of a crash.") \
1028 \
1029 product_pd(bool, UseOSErrorReporting, \
1030 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1031 \
1032 product(bool, SuppressFatalErrorMessage, false, \
1033 "Report NO fatal error message (avoid deadlock)") \
1034 \
1035 product(ccstrlist, OnError, "", \
1036 "Run user-defined commands on fatal error; see VMError.cpp " \
1037 "for examples") \
1038 \
1039 product(ccstrlist, OnOutOfMemoryError, "", \
1040 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1041 \
1042 manageable(bool, HeapDumpBeforeFullGC, false, \
1043 "Dump heap to file before any major stop-the-world GC") \
1044 \
1045 manageable(bool, HeapDumpAfterFullGC, false, \
1046 "Dump heap to file after any major stop-the-world GC") \
1047 \
1048 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1049 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1050 \
1051 manageable(ccstr, HeapDumpPath, NULL, \
1052 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1053 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1054 "in the working directory)") \
1055 \
1056 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1057 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1058 "when the heap usage is larger than this") \
1059 \
1060 develop(size_t, HeapDumpSegmentSize, 1*G, \
1061 "Approximate segment size when generating a segmented heap dump") \
1062 \
1063 develop(bool, BreakAtWarning, false, \
1064 "Execute breakpoint upon encountering VM warning") \
1065 \
1066 develop(bool, TraceVMOperation, false, \
1067 "Trace VM operations") \
1068 \
1069 develop(bool, UseFakeTimers, false, \
1070 "Tell whether the VM should use system time or a fake timer") \
1071 \
1072 product(ccstr, NativeMemoryTracking, "off", \
1073 "Native memory tracking options") \
1074 \
1075 diagnostic(bool, PrintNMTStatistics, false, \
1076 "Print native memory tracking summary data if it is on") \
1077 \
1078 diagnostic(bool, LogCompilation, false, \
1079 "Log compilation activity in detail to LogFile") \
1080 \
1081 product(bool, PrintCompilation, false, \
1082 "Print compilations") \
1083 \
1084 diagnostic(bool, TraceNMethodInstalls, false, \
1085 "Trace nmethod installation") \
1086 \
1087 diagnostic(intx, ScavengeRootsInCode, 2, \
1088 "0: do not allow scavengable oops in the code cache; " \
1089 "1: allow scavenging from the code cache; " \
1090 "2: emit as many constants as the compiler can see") \
1091 range(0, 2) \
1092 \
1093 product(bool, AlwaysRestoreFPU, false, \
1094 "Restore the FPU control word after every JNI call (expensive)") \
1095 \
1096 diagnostic(bool, PrintCompilation2, false, \
1097 "Print additional statistics per compilation") \
1098 \
1099 diagnostic(bool, PrintAdapterHandlers, false, \
1100 "Print code generated for i2c/c2i adapters") \
1101 \
1102 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1103 "Verify that i2c/c2i adapters are called properly") \
1104 \
1105 develop(bool, VerifyAdapterSharing, false, \
1106 "Verify that the code for shared adapters is the equivalent") \
1107 \
1108 diagnostic(bool, PrintAssembly, false, \
1109 "Print assembly code (using external disassembler.so)") \
1110 \
1111 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1112 "Print options string passed to disassembler.so") \
1113 \
1114 notproduct(bool, PrintNMethodStatistics, false, \
1115 "Print a summary statistic for the generated nmethods") \
1116 \
1117 diagnostic(bool, PrintNMethods, false, \
1118 "Print assembly code for nmethods when generated") \
1119 \
1120 diagnostic(intx, PrintNMethodsAtLevel, -1, \
1121 "Only print code for nmethods at the given compilation level") \
1122 \
1123 diagnostic(bool, PrintNativeNMethods, false, \
1124 "Print assembly code for native nmethods when generated") \
1125 \
1126 develop(bool, PrintDebugInfo, false, \
1127 "Print debug information for all nmethods when generated") \
1128 \
1129 develop(bool, PrintRelocations, false, \
1130 "Print relocation information for all nmethods when generated") \
1131 \
1132 develop(bool, PrintDependencies, false, \
1133 "Print dependency information for all nmethods when generated") \
1134 \
1135 develop(bool, PrintExceptionHandlers, false, \
1136 "Print exception handler tables for all nmethods when generated") \
1137 \
1138 develop(bool, StressCompiledExceptionHandlers, false, \
1139 "Exercise compiled exception handlers") \
1140 \
1141 develop(bool, InterceptOSException, false, \
1142 "Start debugger when an implicit OS (e.g. NULL) " \
1143 "exception happens") \
1144 \
1145 product(bool, PrintCodeCache, false, \
1146 "Print the code cache memory usage when exiting") \
1147 \
1148 develop(bool, PrintCodeCache2, false, \
1149 "Print detailed usage information on the code cache when exiting")\
1150 \
1151 product(bool, PrintCodeCacheOnCompilation, false, \
1152 "Print the code cache memory usage each time a method is " \
1153 "compiled") \
1154 \
1155 diagnostic(bool, PrintStubCode, false, \
1156 "Print generated stub code") \
1157 \
1158 product(bool, StackTraceInThrowable, true, \
1159 "Collect backtrace in throwable when exception happens") \
1160 \
1161 product(bool, OmitStackTraceInFastThrow, true, \
1162 "Omit backtraces for some 'hot' exceptions in optimized code") \
1163 \
1164 product(bool, ProfilerPrintByteCodeStatistics, false, \
1165 "Print bytecode statistics when dumping profiler output") \
1166 \
1167 product(bool, ProfilerRecordPC, false, \
1168 "Collect ticks for each 16 byte interval of compiled code") \
1169 \
1170 product(bool, ProfileVM, false, \
1171 "Profile ticks that fall within VM (either in the VM Thread " \
1172 "or VM code called through stubs)") \
1173 \
1174 product(bool, ProfileIntervals, false, \
1175 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1176 \
1177 notproduct(bool, ProfilerCheckIntervals, false, \
1178 "Collect and print information on spacing of profiler ticks") \
1179 \
1180 product(bool, PrintWarnings, true, \
1181 "Print JVM warnings to output stream") \
1182 \
1183 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1184 "Print warnings for stalled SpinLocks") \
1185 \
1186 product(bool, RegisterFinalizersAtInit, true, \
1187 "Register finalizable objects at end of Object.<init> or " \
1188 "after allocation") \
1189 \
1190 develop(bool, RegisterReferences, true, \
1191 "Tell whether the VM should register soft/weak/final/phantom " \
1192 "references") \
1193 \
1194 develop(bool, IgnoreRewrites, false, \
1195 "Suppress rewrites of bytecodes in the oopmap generator. " \
1196 "This is unsafe!") \
1197 \
1198 develop(bool, PrintCodeCacheExtension, false, \
1199 "Print extension of code cache") \
1200 \
1201 develop(bool, UsePrivilegedStack, true, \
1202 "Enable the security JVM functions") \
1203 \
1204 develop(bool, ProtectionDomainVerification, true, \
1205 "Verify protection domain before resolution in system dictionary")\
1206 \
1207 product(bool, ClassUnloading, true, \
1208 "Do unloading of classes") \
1209 \
1210 product(bool, ClassUnloadingWithConcurrentMark, true, \
1211 "Do unloading of classes with a concurrent marking cycle") \
1212 \
1213 develop(bool, DisableStartThread, false, \
1214 "Disable starting of additional Java threads " \
1215 "(for debugging only)") \
1216 \
1217 develop(bool, MemProfiling, false, \
1218 "Write memory usage profiling to log file") \
1219 \
1220 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1221 "Print the system dictionary at exit") \
1222 \
1223 experimental(intx, PredictedLoadedClassCount, 0, \
1224 "Experimental: Tune loaded class cache starting size") \
1225 \
1226 diagnostic(bool, UnsyncloadClass, false, \
1227 "Unstable: VM calls loadClass unsynchronized. Custom " \
1228 "class loader must call VM synchronized for findClass " \
1229 "and defineClass.") \
1230 \
1231 product(bool, AlwaysLockClassLoader, false, \
1232 "Require the VM to acquire the class loader lock before calling " \
1233 "loadClass() even for class loaders registering " \
1234 "as parallel capable") \
1235 \
1236 product(bool, AllowParallelDefineClass, false, \
1237 "Allow parallel defineClass requests for class loaders " \
1238 "registering as parallel capable") \
1239 \
1240 product(bool, MustCallLoadClassInternal, false, \
1241 "Call loadClassInternal() rather than loadClass()") \
1242 \
1243 product_pd(bool, DontYieldALot, \
1244 "Throw away obvious excess yield calls") \
1245 \
1246 product_pd(bool, ConvertSleepToYield, \
1247 "Convert sleep(0) to thread yield " \
1248 "(may be off for Solaris to improve GUI)") \
1249 \
1250 product(bool, ConvertYieldToSleep, false, \
1251 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1252 "behavior") \
1253 \
1254 develop(bool, UseDetachedThreads, true, \
1255 "Use detached threads that are recycled upon termination " \
1256 "(for Solaris only)") \
1257 \
1258 product(bool, UseLWPSynchronization, true, \
1259 "Use LWP-based instead of libthread-based synchronization " \
1260 "(SPARC only)") \
1261 \
1262 experimental(ccstr, SyncKnobs, NULL, \
1263 "(Unstable) Various monitor synchronization tunables") \
1264 \
1265 experimental(intx, EmitSync, 0, \
1266 "(Unsafe, Unstable) " \
1267 "Control emission of inline sync fast-path code") \
1268 \
1269 product(intx, MonitorBound, 0, "Bound Monitor population") \
1270 range(0, max_jint) \
1271 \
1272 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1273 \
1274 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1275 "Experimental Sync flags") \
1276 \
1277 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1278 \
1279 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1280 \
1281 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1282 \
1283 experimental(intx, hashCode, 5, \
1284 "(Unstable) select hashCode generation algorithm") \
1285 \
1286 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1287 "(Unstable, Linux-specific) " \
1288 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1289 \
1290 product(bool, FilterSpuriousWakeups, true, \
1291 "When true prevents OS-level spurious, or premature, wakeups " \
1292 "from Object.wait (Ignored for Windows)") \
1293 \
1294 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1295 \
1296 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1297 \
1298 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1299 \
1300 develop(bool, UsePthreads, false, \
1301 "Use pthread-based instead of libthread-based synchronization " \
1302 "(SPARC only)") \
1303 \
1304 product(bool, ReduceSignalUsage, false, \
1305 "Reduce the use of OS signals in Java and/or the VM") \
1306 \
1307 develop_pd(bool, ShareVtableStubs, \
1308 "Share vtable stubs (smaller code but worse branch prediction") \
1309 \
1310 develop(bool, LoadLineNumberTables, true, \
1311 "Tell whether the class file parser loads line number tables") \
1312 \
1313 develop(bool, LoadLocalVariableTables, true, \
1314 "Tell whether the class file parser loads local variable tables") \
1315 \
1316 develop(bool, LoadLocalVariableTypeTables, true, \
1317 "Tell whether the class file parser loads local variable type" \
1318 "tables") \
1319 \
1320 product(bool, AllowUserSignalHandlers, false, \
1321 "Do not complain if the application installs signal handlers " \
1322 "(Solaris & Linux only)") \
1323 \
1324 product(bool, UseSignalChaining, true, \
1325 "Use signal-chaining to invoke signal handlers installed " \
1326 "by the application (Solaris & Linux only)") \
1327 \
1328 product(bool, UseAltSigs, false, \
1329 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1330 "internal signals (Solaris only)") \
1331 \
1332 product(bool, AllowJNIEnvProxy, false, \
1333 "Allow JNIEnv proxies for jdbx") \
1334 \
1335 product(bool, RestoreMXCSROnJNICalls, false, \
1336 "Restore MXCSR when returning from JNI calls") \
1337 \
1338 product(bool, CheckJNICalls, false, \
1339 "Verify all arguments to JNI calls") \
1340 \
1341 product(bool, CheckEndorsedAndExtDirs, false, \
1342 "Verify the endorsed and extension directories are not used") \
1343 \
1344 product(bool, UseFastJNIAccessors, true, \
1345 "Use optimized versions of Get<Primitive>Field") \
1346 \
1347 product(intx, MaxJNILocalCapacity, 65536, \
1348 "Maximum allowable local JNI handle capacity to " \
1349 "EnsureLocalCapacity() and PushLocalFrame(), " \
1350 "where <= 0 is unlimited, default: 65536") \
1351 range(min_intx, max_intx) \
1352 \
1353 product(bool, EagerXrunInit, false, \
1354 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1355 "but not all -Xrun libraries may support the state of the VM " \
1356 "at this time") \
1357 \
1358 product(bool, PreserveAllAnnotations, false, \
1359 "Preserve RuntimeInvisibleAnnotations as well " \
1360 "as RuntimeVisibleAnnotations") \
1361 \
1362 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1363 "Number of OutOfMemoryErrors preallocated with backtrace") \
1364 \
1365 product(bool, UseXMMForArrayCopy, false, \
1366 "Use SSE2 MOVQ instruction for Arraycopy") \
1367 \
1368 product(intx, FieldsAllocationStyle, 1, \
1369 "0 - type based with oops first, " \
1370 "1 - with oops last, " \
1371 "2 - oops in super and sub classes are together") \
1372 range(0, 2) \
1373 \
1374 product(bool, CompactFields, true, \
1375 "Allocate nonstatic fields in gaps between previous fields") \
1376 \
1377 notproduct(bool, PrintFieldLayout, false, \
1378 "Print field layout for each class") \
1379 \
1380 /* Need to limit the extent of the padding to reasonable size. */\
1381 /* 8K is well beyond the reasonable HW cache line size, even with */\
1382 /* aggressive prefetching, while still leaving the room for segregating */\
1383 /* among the distinct pages. */\
1384 product(intx, ContendedPaddingWidth, 128, \
1385 "How many bytes to pad the fields/classes marked @Contended with")\
1386 range(0, 8192) \
1387 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1388 \
1389 product(bool, EnableContended, true, \
1390 "Enable @Contended annotation support") \
1391 \
1392 product(bool, RestrictContended, true, \
1393 "Restrict @Contended to trusted classes") \
1394 \
1395 product(bool, UseBiasedLocking, true, \
1396 "Enable biased locking in JVM") \
1397 \
1398 product(intx, BiasedLockingStartupDelay, 4000, \
1399 "Number of milliseconds to wait before enabling biased locking") \
1400 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1401 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1402 \
1403 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1404 "Print statistics of biased locking in JVM") \
1405 \
1406 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1407 "Threshold of number of revocations per type to try to " \
1408 "rebias all objects in the heap of that type") \
1409 range(0, max_intx) \
1410 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1411 \
1412 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1413 "Threshold of number of revocations per type to permanently " \
1414 "revoke biases of all objects in the heap of that type") \
1415 range(0, max_intx) \
1416 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1417 \
1418 product(intx, BiasedLockingDecayTime, 25000, \
1419 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1420 "type after previous bulk rebias") \
1421 range(500, max_intx) \
1422 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1423 \
1424 /* tracing */ \
1425 \
1426 notproduct(bool, TraceRuntimeCalls, false, \
1427 "Trace run-time calls") \
1428 \
1429 develop(bool, TraceJNICalls, false, \
1430 "Trace JNI calls") \
1431 \
1432 develop(bool, StressRewriter, false, \
1433 "Stress linktime bytecode rewriting") \
1434 \
1435 notproduct(bool, TraceJVMCalls, false, \
1436 "Trace JVM calls") \
1437 \
1438 product(ccstr, TraceJVMTI, NULL, \
1439 "Trace flags for JVMTI functions and events") \
1440 \
1441 /* This option can change an EMCP method into an obsolete method. */ \
1442 /* This can affect tests that except specific methods to be EMCP. */ \
1443 /* This option should be used with caution. */ \
1444 product(bool, StressLdcRewrite, false, \
1445 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1446 \
1447 product(uintx, TraceRedefineClasses, 0, \
1448 "Trace level for JVMTI RedefineClasses") \
1449 range(0, 0xFFFFFFFF) \
1450 \
1451 /* change to false by default sometime after Mustang */ \
1452 product(bool, VerifyMergedCPBytecodes, true, \
1453 "Verify bytecodes after RedefineClasses constant pool merging") \
1454 \
1455 develop(bool, TraceJNIHandleAllocation, false, \
1456 "Trace allocation/deallocation of JNI handle blocks") \
1457 \
1458 develop(bool, TraceBytecodes, false, \
1459 "Trace bytecode execution") \
1460 \
1461 develop(bool, TraceClassInitialization, false, \
1462 "Trace class initialization") \
1463 \
1464 product(bool, TraceExceptions, false, \
1465 "Trace exceptions") \
1466 \
1467 develop(bool, TraceICs, false, \
1468 "Trace inline cache changes") \
1469 \
1470 notproduct(bool, TraceInvocationCounterOverflow, false, \
1471 "Trace method invocation counter overflow") \
1472 \
1473 develop(bool, TraceInlineCacheClearing, false, \
1474 "Trace clearing of inline caches in nmethods") \
1475 \
1476 develop(bool, TraceDependencies, false, \
1477 "Trace dependencies") \
1478 \
1479 develop(bool, VerifyDependencies, trueInDebug, \
1480 "Exercise and verify the compilation dependency mechanism") \
1481 \
1482 develop(bool, TraceNewOopMapGeneration, false, \
1483 "Trace OopMapGeneration") \
1484 \
1485 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1486 "Trace OopMapGeneration: print detailed cell states") \
1487 \
1488 develop(bool, TimeOopMap, false, \
1489 "Time calls to GenerateOopMap::compute_map() in sum") \
1490 \
1491 develop(bool, TimeOopMap2, false, \
1492 "Time calls to GenerateOopMap::compute_map() individually") \
1493 \
1494 develop(bool, TraceMonitorMismatch, false, \
1495 "Trace monitor matching failures during OopMapGeneration") \
1496 \
1497 develop(bool, TraceOopMapRewrites, false, \
1498 "Trace rewriting of method oops during oop map generation") \
1499 \
1500 develop(bool, TraceICBuffer, false, \
1501 "Trace usage of IC buffer") \
1502 \
1503 develop(bool, TraceCompiledIC, false, \
1504 "Trace changes of compiled IC") \
1505 \
1506 develop(bool, TraceStartupTime, false, \
1507 "Trace setup time") \
1508 \
1509 develop(bool, TraceProtectionDomainVerification, false, \
1510 "Trace protection domain verification") \
1511 \
1512 develop(bool, TraceClearedExceptions, false, \
1513 "Print when an exception is forcibly cleared") \
1514 \
1515 product(bool, TraceClassResolution, false, \
1516 "Trace all constant pool resolutions (for debugging)") \
1517 \
1518 product(bool, TraceBiasedLocking, false, \
1519 "Trace biased locking in JVM") \
1520 \
1521 product(bool, TraceMonitorInflation, false, \
1522 "Trace monitor inflation in JVM") \
1523 \
1524 /* gc */ \
1525 \
1526 product(bool, UseSerialGC, false, \
1527 "Use the Serial garbage collector") \
1528 \
1529 product(bool, UseG1GC, false, \
1530 "Use the Garbage-First garbage collector") \
1531 \
1532 product(bool, UseParallelGC, false, \
1533 "Use the Parallel Scavenge garbage collector") \
1534 \
1535 product(bool, UseParallelOldGC, false, \
1536 "Use the Parallel Old garbage collector") \
1537 \
1538 product(uintx, HeapMaximumCompactionInterval, 20, \
1539 "How often should we maximally compact the heap (not allowing " \
1540 "any dead space)") \
1541 \
1542 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1543 "The collection count for the first maximum compaction") \
1544 \
1545 product(bool, UseMaximumCompactionOnSystemGC, true, \
1546 "Use maximum compaction in the Parallel Old garbage collector " \
1547 "for a system GC") \
1548 \
1549 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1550 "The mean used by the parallel compact dead wood " \
1551 "limiter (a number between 0-100)") \
1552 range(0, 100) \
1553 \
1554 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1555 "The standard deviation used by the parallel compact dead wood " \
1556 "limiter (a number between 0-100)") \
1557 range(0, 100) \
1558 \
1559 product(uint, ParallelGCThreads, 0, \
1560 "Number of parallel threads parallel gc will use") \
1561 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1562 \
1563 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1564 "Use semaphore synchronization for the GC Threads, " \
1565 "instead of synchronization based on mutexes") \
1566 \
1567 product(bool, UseDynamicNumberOfGCThreads, false, \
1568 "Dynamically choose the number of parallel threads " \
1569 "parallel gc will use") \
1570 \
1571 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1572 "Force dynamic selection of the number of " \
1573 "parallel threads parallel gc will use to aid debugging") \
1574 \
1575 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1576 "Size of heap (bytes) per GC thread used in calculating the " \
1577 "number of GC threads") \
1578 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1579 \
1580 product(uint, ConcGCThreads, 0, \
1581 "Number of threads concurrent gc will use") \
1582 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1583 \
1584 product(uintx, GCTaskTimeStampEntries, 200, \
1585 "Number of time stamp entries per gc worker thread") \
1586 range(1, max_uintx) \
1587 \
1588 product(bool, AlwaysTenure, false, \
1589 "Always tenure objects in eden (ParallelGC only)") \
1590 \
1591 product(bool, NeverTenure, false, \
1592 "Never tenure objects in eden, may tenure on overflow " \
1593 "(ParallelGC only)") \
1594 \
1595 product(bool, ScavengeBeforeFullGC, true, \
1596 "Scavenge youngest generation before each full GC.") \
1597 \
1598 product(bool, UseConcMarkSweepGC, false, \
1599 "Use Concurrent Mark-Sweep GC in the old generation") \
1600 \
1601 product(bool, ExplicitGCInvokesConcurrent, false, \
1602 "A System.gc() request invokes a concurrent collection; " \
1603 "(effective only when using concurrent collectors)") \
1604 \
1605 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1606 "A System.gc() request invokes a concurrent collection and " \
1607 "also unloads classes during such a concurrent gc cycle " \
1608 "(effective only when UseConcMarkSweepGC)") \
1609 \
1610 product(bool, GCLockerInvokesConcurrent, false, \
1611 "The exit of a JNI critical section necessitating a scavenge, " \
1612 "also kicks off a background concurrent collection") \
1613 \
1614 product(uintx, GCLockerEdenExpansionPercent, 5, \
1615 "How much the GC can expand the eden by while the GC locker " \
1616 "is active (as a percentage)") \
1617 range(0, 100) \
1618 \
1619 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1620 "Number of times to retry allocations when " \
1621 "blocked by the GC locker") \
1622 \
1623 product(bool, UseCMSBestFit, true, \
1624 "Use CMS best fit allocation strategy") \
1625 \
1626 product(bool, UseParNewGC, false, \
1627 "Use parallel threads in the new generation") \
1628 \
1629 product(uintx, ParallelGCBufferWastePct, 10, \
1630 "Wasted fraction of parallel allocation buffer") \
1631 range(0, 100) \
1632 \
1633 product(uintx, TargetPLABWastePct, 10, \
1634 "Target wasted space in last buffer as percent of overall " \
1635 "allocation") \
1636 range(1, 100) \
1637 \
1638 product(uintx, PLABWeight, 75, \
1639 "Percentage (0-100) used to weight the current sample when " \
1640 "computing exponentially decaying average for ResizePLAB") \
1641 range(0, 100) \
1642 \
1643 product(bool, ResizePLAB, true, \
1644 "Dynamically resize (survivor space) promotion LAB's") \
1645 \
1646 product(bool, PrintPLAB, false, \
1647 "Print (survivor space) promotion LAB's sizing decisions") \
1648 \
1649 product(intx, ParGCArrayScanChunk, 50, \
1650 "Scan a subset of object array and push remainder, if array is " \
1651 "bigger than this") \
1652 range(1, max_intx) \
1653 \
1654 product(bool, ParGCUseLocalOverflow, false, \
1655 "Instead of a global overflow list, use local overflow stacks") \
1656 \
1657 product(bool, ParGCTrimOverflow, true, \
1658 "Eagerly trim the local overflow lists " \
1659 "(when ParGCUseLocalOverflow)") \
1660 \
1661 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1662 "Simulate work queue overflow in ParNew") \
1663 \
1664 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1665 "An `interval' counter that determines how frequently " \
1666 "we simulate overflow; a smaller number increases frequency") \
1667 \
1668 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1669 "The desired number of objects to claim from the overflow list") \
1670 \
1671 diagnostic(uintx, ParGCStridesPerThread, 2, \
1672 "The number of strides per worker thread that we divide up the " \
1673 "card table scanning work into") \
1674 range(1, max_uintx) \
1675 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1676 \
1677 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1678 "The number of cards in each chunk of the parallel chunks used " \
1679 "during card table scanning") \
1680 range(1, max_intx) \
1681 \
1682 product(uintx, OldPLABWeight, 50, \
1683 "Percentage (0-100) used to weight the current sample when " \
1684 "computing exponentially decaying average for resizing " \
1685 "OldPLABSize") \
1686 range(0, 100) \
1687 \
1688 product(bool, ResizeOldPLAB, true, \
1689 "Dynamically resize (old gen) promotion LAB's") \
1690 \
1691 product(bool, PrintOldPLAB, false, \
1692 "Print (old gen) promotion LAB's sizing decisions") \
1693 \
1694 product(size_t, CMSOldPLABMax, 1024, \
1695 "Maximum size of CMS gen promotion LAB caches per worker " \
1696 "per block size") \
1697 range(1, max_uintx) \
1698 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1699 \
1700 product(size_t, CMSOldPLABMin, 16, \
1701 "Minimum size of CMS gen promotion LAB caches per worker " \
1702 "per block size") \
1703 range(1, max_uintx) \
1704 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1705 \
1706 product(uintx, CMSOldPLABNumRefills, 4, \
1707 "Nominal number of refills of CMS gen promotion LAB cache " \
1708 "per worker per block size") \
1709 range(1, max_uintx) \
1710 \
1711 product(bool, CMSOldPLABResizeQuicker, false, \
1712 "React on-the-fly during a scavenge to a sudden " \
1713 "change in block demand rate") \
1714 \
1715 product(uintx, CMSOldPLABToleranceFactor, 4, \
1716 "The tolerance of the phase-change detector for on-the-fly " \
1717 "PLAB resizing during a scavenge") \
1718 range(1, max_uintx) \
1719 \
1720 product(uintx, CMSOldPLABReactivityFactor, 2, \
1721 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1722 "during a scavenge") \
1723 \
1724 product(bool, AlwaysPreTouch, false, \
1725 "Force all freshly committed pages to be pre-touched") \
1726 \
1727 product_pd(size_t, CMSYoungGenPerWorker, \
1728 "The maximum size of young gen chosen by default per GC worker " \
1729 "thread available") \
1730 range(1, max_uintx) \
1731 \
1732 product(uintx, CMSIncrementalSafetyFactor, 10, \
1733 "Percentage (0-100) used to add conservatism when computing the " \
1734 "duty cycle") \
1735 range(0, 100) \
1736 \
1737 product(uintx, CMSExpAvgFactor, 50, \
1738 "Percentage (0-100) used to weight the current sample when " \
1739 "computing exponential averages for CMS statistics") \
1740 range(0, 100) \
1741 \
1742 product(uintx, CMS_FLSWeight, 75, \
1743 "Percentage (0-100) used to weight the current sample when " \
1744 "computing exponentially decaying averages for CMS FLS " \
1745 "statistics") \
1746 range(0, 100) \
1747 \
1748 product(uintx, CMS_FLSPadding, 1, \
1749 "The multiple of deviation from mean to use for buffering " \
1750 "against volatility in free list demand") \
1751 \
1752 product(uintx, FLSCoalescePolicy, 2, \
1753 "CMS: aggressiveness level for coalescing, increasing " \
1754 "from 0 to 4") \
1755 range(0, 4) \
1756 \
1757 product(bool, FLSAlwaysCoalesceLarge, false, \
1758 "CMS: larger free blocks are always available for coalescing") \
1759 \
1760 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1761 "CMS: the smaller the percentage the greater the coalescing " \
1762 "force") \
1763 range(0.0, 1.0) \
1764 \
1765 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1766 "CMS: the factor by which to inflate estimated demand of small " \
1767 "block sizes to prevent coalescing with an adjoining block") \
1768 range(0.0, DBL_MAX) \
1769 \
1770 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1771 "CMS: the factor by which to inflate estimated demand of large " \
1772 "block sizes to prevent coalescing with an adjoining block") \
1773 range(0.0, DBL_MAX) \
1774 \
1775 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1776 "CMS: the factor by which to inflate estimated demand of small " \
1777 "block sizes to prevent splitting to supply demand for smaller " \
1778 "blocks") \
1779 range(0.0, DBL_MAX) \
1780 \
1781 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1782 "CMS: the factor by which to inflate estimated demand of large " \
1783 "block sizes to prevent splitting to supply demand for smaller " \
1784 "blocks") \
1785 range(0.0, DBL_MAX) \
1786 \
1787 product(bool, CMSExtrapolateSweep, false, \
1788 "CMS: cushion for block demand during sweep") \
1789 \
1790 product(uintx, CMS_SweepWeight, 75, \
1791 "Percentage (0-100) used to weight the current sample when " \
1792 "computing exponentially decaying average for inter-sweep " \
1793 "duration") \
1794 range(0, 100) \
1795 \
1796 product(uintx, CMS_SweepPadding, 1, \
1797 "The multiple of deviation from mean to use for buffering " \
1798 "against volatility in inter-sweep duration") \
1799 \
1800 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1801 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1802 "duration exceeds this threshold in milliseconds") \
1803 \
1804 product(bool, CMSClassUnloadingEnabled, true, \
1805 "Whether class unloading enabled when using CMS GC") \
1806 \
1807 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1808 "When CMS class unloading is enabled, the maximum CMS cycle " \
1809 "count for which classes may not be unloaded") \
1810 \
1811 product(uintx, CMSIndexedFreeListReplenish, 4, \
1812 "Replenish an indexed free list with this number of chunks") \
1813 range(1, max_uintx) \
1814 \
1815 product(bool, CMSReplenishIntermediate, true, \
1816 "Replenish all intermediate free-list caches") \
1817 \
1818 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1819 "When satisfying batched demand, split blocks from the " \
1820 "IndexedFreeList whose size is a multiple of requested size") \
1821 \
1822 product(bool, CMSLoopWarn, false, \
1823 "Warn in case of excessive CMS looping") \
1824 \
1825 /* where does the range max value of (max_jint - 1) come from? */ \
1826 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1827 "Maximum size of marking stack") \
1828 range(1, (max_jint - 1)) \
1829 \
1830 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1831 "Size of marking stack") \
1832 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1833 \
1834 notproduct(bool, CMSMarkStackOverflowALot, false, \
1835 "Simulate frequent marking stack / work queue overflow") \
1836 \
1837 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1838 "An \"interval\" counter that determines how frequently " \
1839 "to simulate overflow; a smaller number increases frequency") \
1840 \
1841 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1842 "Maximum number of abortable preclean iterations, if > 0") \
1843 \
1844 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1845 "Maximum time in abortable preclean (in milliseconds)") \
1846 range(0, max_intx) \
1847 \
1848 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1849 "Nominal minimum work per abortable preclean iteration") \
1850 \
1851 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1852 "Time that we sleep between iterations when not given " \
1853 "enough work per iteration") \
1854 range(0, max_intx) \
1855 \
1856 product(size_t, CMSRescanMultiple, 32, \
1857 "Size (in cards) of CMS parallel rescan task") \
1858 range(1, max_uintx) \
1859 \
1860 product(size_t, CMSConcMarkMultiple, 32, \
1861 "Size (in cards) of CMS concurrent MT marking task") \
1862 range(1, max_uintx) \
1863 \
1864 product(bool, CMSAbortSemantics, false, \
1865 "Whether abort-on-overflow semantics is implemented") \
1866 \
1867 product(bool, CMSParallelInitialMarkEnabled, true, \
1868 "Use the parallel initial mark.") \
1869 \
1870 product(bool, CMSParallelRemarkEnabled, true, \
1871 "Whether parallel remark enabled (only if ParNewGC)") \
1872 \
1873 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1874 "Whether parallel remark of survivor space " \
1875 "enabled (effective only if CMSParallelRemarkEnabled)") \
1876 \
1877 product(bool, CMSPLABRecordAlways, true, \
1878 "Always record survivor space PLAB boundaries (effective only " \
1879 "if CMSParallelSurvivorRemarkEnabled)") \
1880 \
1881 product(bool, CMSEdenChunksRecordAlways, true, \
1882 "Always record eden chunks used for the parallel initial mark " \
1883 "or remark of eden") \
1884 \
1885 product(bool, CMSPrintEdenSurvivorChunks, false, \
1886 "Print the eden and the survivor chunks used for the parallel " \
1887 "initial mark or remark of the eden/survivor spaces") \
1888 \
1889 product(bool, CMSConcurrentMTEnabled, true, \
1890 "Whether multi-threaded concurrent work enabled " \
1891 "(effective only if ParNewGC)") \
1892 \
1893 product(bool, CMSPrecleaningEnabled, true, \
1894 "Whether concurrent precleaning enabled") \
1895 \
1896 product(uintx, CMSPrecleanIter, 3, \
1897 "Maximum number of precleaning iteration passes") \
1898 range(0, 9) \
1899 \
1900 product(uintx, CMSPrecleanDenominator, 3, \
1901 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1902 "ratio") \
1903 range(1, max_uintx) \
1904 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1905 \
1906 product(uintx, CMSPrecleanNumerator, 2, \
1907 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1908 "ratio") \
1909 range(0, max_uintx-1) \
1910 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1911 \
1912 product(bool, CMSPrecleanRefLists1, true, \
1913 "Preclean ref lists during (initial) preclean phase") \
1914 \
1915 product(bool, CMSPrecleanRefLists2, false, \
1916 "Preclean ref lists during abortable preclean phase") \
1917 \
1918 product(bool, CMSPrecleanSurvivors1, false, \
1919 "Preclean survivors during (initial) preclean phase") \
1920 \
1921 product(bool, CMSPrecleanSurvivors2, true, \
1922 "Preclean survivors during abortable preclean phase") \
1923 \
1924 product(uintx, CMSPrecleanThreshold, 1000, \
1925 "Do not iterate again if number of dirty cards is less than this")\
1926 range(100, max_uintx) \
1927 \
1928 product(bool, CMSCleanOnEnter, true, \
1929 "Clean-on-enter optimization for reducing number of dirty cards") \
1930 \
1931 product(uintx, CMSRemarkVerifyVariant, 1, \
1932 "Choose variant (1,2) of verification following remark") \
1933 range(1, 2) \
1934 \
1935 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1936 "If Eden size is below this, do not try to schedule remark") \
1937 \
1938 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1939 "The Eden occupancy percentage (0-100) at which " \
1940 "to try and schedule remark pause") \
1941 range(0, 100) \
1942 \
1943 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1944 "Start sampling eden top at least before young gen " \
1945 "occupancy reaches 1/<ratio> of the size at which " \
1946 "we plan to schedule remark") \
1947 range(1, max_uintx) \
1948 \
1949 product(uintx, CMSSamplingGrain, 16*K, \
1950 "The minimum distance between eden samples for CMS (see above)") \
1951 range(1, max_uintx) \
1952 \
1953 product(bool, CMSScavengeBeforeRemark, false, \
1954 "Attempt scavenge before the CMS remark step") \
1955 \
1956 develop(bool, CMSTraceSweeper, false, \
1957 "Trace some actions of the CMS sweeper") \
1958 \
1959 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1960 "Don't drain below this size per parallel worker/thief") \
1961 range(1, max_juint) \
1962 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1963 \
1964 manageable(intx, CMSWaitDuration, 2000, \
1965 "Time in milliseconds that CMS thread waits for young GC") \
1966 \
1967 develop(uintx, CMSCheckInterval, 1000, \
1968 "Interval in milliseconds that CMS thread checks if it " \
1969 "should start a collection cycle") \
1970 \
1971 product(bool, CMSYield, true, \
1972 "Yield between steps of CMS") \
1973 \
1974 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1975 "Bitmap operations should process at most this many bits " \
1976 "between yields") \
1977 range(1, max_uintx) \
1978 \
1979 product(bool, CMSDumpAtPromotionFailure, false, \
1980 "Dump useful information about the state of the CMS old " \
1981 "generation upon a promotion failure") \
1982 \
1983 product(bool, CMSPrintChunksInDump, false, \
1984 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1985 "more detailed information about the free chunks") \
1986 \
1987 product(bool, CMSPrintObjectsInDump, false, \
1988 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1989 "more detailed information about the allocated objects") \
1990 \
1991 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1992 "Verify that all references across the FLS boundary " \
1993 "are to valid objects") \
1994 \
1995 diagnostic(bool, FLSVerifyLists, false, \
1996 "Do lots of (expensive) FreeListSpace verification") \
1997 \
1998 diagnostic(bool, FLSVerifyIndexTable, false, \
1999 "Do lots of (expensive) FLS index table verification") \
2000 \
2001 develop(bool, FLSVerifyDictionary, false, \
2002 "Do lots of (expensive) FLS dictionary verification") \
2003 \
2004 develop(bool, VerifyBlockOffsetArray, false, \
2005 "Do (expensive) block offset array verification") \
2006 \
2007 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2008 "Maintain _unallocated_block in BlockOffsetArray " \
2009 "(currently applicable only to CMS collector)") \
2010 \
2011 develop(bool, TraceCMSState, false, \
2012 "Trace the state of the CMS collection") \
2013 \
2014 product(intx, RefDiscoveryPolicy, 0, \
2015 "Select type of reference discovery policy: " \
2016 "reference-based(0) or referent-based(1)") \
2017 range(ReferenceProcessor::DiscoveryPolicyMin, \
2018 ReferenceProcessor::DiscoveryPolicyMax) \
2019 \
2020 product(bool, ParallelRefProcEnabled, false, \
2021 "Enable parallel reference processing whenever possible") \
2022 \
2023 product(bool, ParallelRefProcBalancingEnabled, true, \
2024 "Enable balancing of reference processing queues") \
2025 \
2026 product(uintx, CMSTriggerRatio, 80, \
2027 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2028 "allocated before a CMS collection cycle commences") \
2029 range(0, 100) \
2030 \
2031 product(uintx, CMSBootstrapOccupancy, 50, \
2032 "Percentage CMS generation occupancy at which to " \
2033 "initiate CMS collection for bootstrapping collection stats") \
2034 range(0, 100) \
2035 \
2036 product(intx, CMSInitiatingOccupancyFraction, -1, \
2037 "Percentage CMS generation occupancy to start a CMS collection " \
2038 "cycle. A negative value means that CMSTriggerRatio is used") \
2039 range(min_intx, 100) \
2040 \
2041 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2042 "Percentage of the (entire) heap occupancy to start a " \
2043 "concurrent GC cycle. It is used by GCs that trigger a " \
2044 "concurrent GC cycle based on the occupancy of the entire heap, " \
2045 "not just one of the generations (e.g., G1). A value of 0 " \
2046 "denotes 'do constant GC cycles'.") \
2047 range(0, 100) \
2048 \
2049 manageable(intx, CMSTriggerInterval, -1, \
2050 "Commence a CMS collection cycle (at least) every so many " \
2051 "milliseconds (0 permanently, -1 disabled)") \
2052 range(-1, max_intx) \
2053 \
2054 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2055 "Only use occupancy as a criterion for starting a CMS collection")\
2056 \
2057 product(uintx, CMSIsTooFullPercentage, 98, \
2058 "An absolute ceiling above which CMS will always consider the " \
2059 "unloading of classes when class unloading is enabled") \
2060 range(0, 100) \
2061 \
2062 notproduct(bool, CMSVerifyReturnedBytes, false, \
2063 "Check that all the garbage collected was returned to the " \
2064 "free lists") \
2065 \
2066 notproduct(bool, ScavengeALot, false, \
2067 "Force scavenge at every Nth exit from the runtime system " \
2068 "(N=ScavengeALotInterval)") \
2069 \
2070 develop(bool, FullGCALot, false, \
2071 "Force full gc at every Nth exit from the runtime system " \
2072 "(N=FullGCALotInterval)") \
2073 \
2074 notproduct(bool, GCALotAtAllSafepoints, false, \
2075 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2076 \
2077 product(bool, PrintPromotionFailure, false, \
2078 "Print additional diagnostic information following " \
2079 "promotion failure") \
2080 \
2081 notproduct(bool, PromotionFailureALot, false, \
2082 "Use promotion failure handling on every youngest generation " \
2083 "collection") \
2084 \
2085 develop(uintx, PromotionFailureALotCount, 1000, \
2086 "Number of promotion failures occurring at PLAB " \
2087 "refill attempts (ParNew) or promotion attempts " \
2088 "(other young collectors)") \
2089 \
2090 develop(uintx, PromotionFailureALotInterval, 5, \
2091 "Total collections between promotion failures a lot") \
2092 \
2093 experimental(uintx, WorkStealingSleepMillis, 1, \
2094 "Sleep time when sleep is used for yields") \
2095 \
2096 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2097 "Number of yields before a sleep is done during work stealing") \
2098 \
2099 experimental(uintx, WorkStealingHardSpins, 4096, \
2100 "Number of iterations in a spin loop between checks on " \
2101 "time out of hard spin") \
2102 \
2103 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2104 "Ratio of hard spins to calls to yield") \
2105 \
2106 develop(uintx, ObjArrayMarkingStride, 512, \
2107 "Number of object array elements to push onto the marking stack " \
2108 "before pushing a continuation entry") \
2109 \
2110 develop(bool, MetadataAllocationFailALot, false, \
2111 "Fail metadata allocations at intervals controlled by " \
2112 "MetadataAllocationFailALotInterval") \
2113 \
2114 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2115 "Metadata allocation failure a lot interval") \
2116 \
2117 develop(bool, TraceMetadataChunkAllocation, false, \
2118 "Trace chunk metadata allocations") \
2119 \
2120 product(bool, TraceMetadataHumongousAllocation, false, \
2121 "Trace humongous metadata allocations") \
2122 \
2123 develop(bool, TraceMetavirtualspaceAllocation, false, \
2124 "Trace virtual space metadata allocations") \
2125 \
2126 notproduct(bool, ExecuteInternalVMTests, false, \
2127 "Enable execution of internal VM tests") \
2128 \
2129 notproduct(bool, VerboseInternalVMTests, false, \
2130 "Turn on logging for internal VM tests.") \
2131 \
2132 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2133 \
2134 product_pd(bool, ResizeTLAB, \
2135 "Dynamically resize TLAB size for threads") \
2136 \
2137 product(bool, ZeroTLAB, false, \
2138 "Zero out the newly created TLAB") \
2139 \
2140 product(bool, FastTLABRefill, true, \
2141 "Use fast TLAB refill code") \
2142 \
2143 product(bool, TLABStats, true, \
2144 "Provide more detailed and expensive TLAB statistics.") \
2145 \
2146 product_pd(bool, NeverActAsServerClassMachine, \
2147 "Never act like a server-class machine") \
2148 \
2149 product(bool, AlwaysActAsServerClassMachine, false, \
2150 "Always act like a server-class machine") \
2151 \
2152 product_pd(uint64_t, MaxRAM, \
2153 "Real memory size (in bytes) used to set maximum heap size") \
2154 range(0, 0XFFFFFFFFFFFFFFFF) \
2155 \
2156 product(size_t, ErgoHeapSizeLimit, 0, \
2157 "Maximum ergonomically set heap size (in bytes); zero means use " \
2158 "MaxRAM / MaxRAMFraction") \
2159 \
2160 product(uintx, MaxRAMFraction, 4, \
2161 "Maximum fraction (1/n) of real memory used for maximum heap " \
2162 "size") \
2163 range(1, max_uintx) \
2164 \
2165 product(uintx, MinRAMFraction, 2, \
2166 "Minimum fraction (1/n) of real memory used for maximum heap " \
2167 "size on systems with small physical memory size") \
2168 range(1, max_uintx) \
2169 \
2170 product(uintx, InitialRAMFraction, 64, \
2171 "Fraction (1/n) of real memory used for initial heap size") \
2172 range(1, max_uintx) \
2173 \
2174 develop(uintx, MaxVirtMemFraction, 2, \
2175 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2176 "determining maximum heap size") \
2177 \
2178 product(bool, UseAutoGCSelectPolicy, false, \
2179 "Use automatic collection selection policy") \
2180 \
2181 product(uintx, AutoGCSelectPauseMillis, 5000, \
2182 "Automatic GC selection pause threshold in milliseconds") \
2183 \
2184 product(bool, UseAdaptiveSizePolicy, true, \
2185 "Use adaptive generation sizing policies") \
2186 \
2187 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2188 "Use adaptive survivor sizing policies") \
2189 \
2190 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2191 "Use adaptive young-old sizing policies at minor collections") \
2192 \
2193 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2194 "Use adaptive young-old sizing policies at major collections") \
2195 \
2196 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2197 "Include statistics from System.gc() for adaptive size policy") \
2198 \
2199 product(bool, UseAdaptiveGCBoundary, false, \
2200 "Allow young-old boundary to move") \
2201 \
2202 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2203 "Resize the virtual spaces of the young or old generations") \
2204 range(-1, 1) \
2205 \
2206 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2207 "Policy for changing generation size for throughput goals") \
2208 range(0, 1) \
2209 \
2210 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2211 "Number of steps where heuristics is used before data is used") \
2212 \
2213 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2214 "Number of collections before the adaptive sizing is started") \
2215 \
2216 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2217 "Collection interval for printing information; zero means never") \
2218 \
2219 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2220 "Use adaptive minimum footprint as a goal") \
2221 \
2222 product(uintx, AdaptiveSizePolicyWeight, 10, \
2223 "Weight given to exponential resizing, between 0 and 100") \
2224 range(0, 100) \
2225 \
2226 product(uintx, AdaptiveTimeWeight, 25, \
2227 "Weight given to time in adaptive policy, between 0 and 100") \
2228 range(0, 100) \
2229 \
2230 product(uintx, PausePadding, 1, \
2231 "How much buffer to keep for pause time") \
2232 \
2233 product(uintx, PromotedPadding, 3, \
2234 "How much buffer to keep for promotion failure") \
2235 \
2236 product(uintx, SurvivorPadding, 3, \
2237 "How much buffer to keep for survivor overflow") \
2238 \
2239 product(uintx, ThresholdTolerance, 10, \
2240 "Allowed collection cost difference between generations") \
2241 range(0, 100) \
2242 \
2243 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2244 "If collection costs are within margin, reduce both by full " \
2245 "delta") \
2246 \
2247 product(uintx, YoungGenerationSizeIncrement, 20, \
2248 "Adaptive size percentage change in young generation") \
2249 range(0, 100) \
2250 \
2251 product(uintx, YoungGenerationSizeSupplement, 80, \
2252 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2253 range(0, 100) \
2254 \
2255 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2256 "Decay factor to YoungedGenerationSizeSupplement") \
2257 range(1, max_uintx) \
2258 \
2259 product(uintx, TenuredGenerationSizeIncrement, 20, \
2260 "Adaptive size percentage change in tenured generation") \
2261 range(0, 100) \
2262 \
2263 product(uintx, TenuredGenerationSizeSupplement, 80, \
2264 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2265 range(0, 100) \
2266 \
2267 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2268 "Decay factor to TenuredGenerationSizeIncrement") \
2269 range(1, max_uintx) \
2270 \
2271 product(uintx, MaxGCPauseMillis, max_uintx, \
2272 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2273 "or (G1 Only) the maximum GC time per MMU time slice") \
2274 range(1, max_uintx) \
2275 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \
2276 \
2277 product(uintx, GCPauseIntervalMillis, 0, \
2278 "Time slice for MMU specification") \
2279 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \
2280 \
2281 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2282 "Adaptive size policy maximum GC minor pause time goal " \
2283 "in millisecond") \
2284 \
2285 product(uintx, GCTimeRatio, 99, \
2286 "Adaptive size policy application time to GC time ratio") \
2287 \
2288 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2289 "Adaptive size scale down factor for shrinking") \
2290 range(1, max_uintx) \
2291 \
2292 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2293 "Adaptive size decays the major cost for long major intervals") \
2294 \
2295 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2296 "Time scale over which major costs decay") \
2297 \
2298 product(uintx, MinSurvivorRatio, 3, \
2299 "Minimum ratio of young generation/survivor space size") \
2300 range(3, max_uintx) \
2301 \
2302 product(uintx, InitialSurvivorRatio, 8, \
2303 "Initial ratio of young generation/survivor space size") \
2304 \
2305 product(size_t, BaseFootPrintEstimate, 256*M, \
2306 "Estimate of footprint other than Java Heap") \
2307 \
2308 product(bool, UseGCOverheadLimit, true, \
2309 "Use policy to limit of proportion of time spent in GC " \
2310 "before an OutOfMemory error is thrown") \
2311 \
2312 product(uintx, GCTimeLimit, 98, \
2313 "Limit of the proportion of time spent in GC before " \
2314 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2315 range(0, 100) \
2316 \
2317 product(uintx, GCHeapFreeLimit, 2, \
2318 "Minimum percentage of free space after a full GC before an " \
2319 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2320 range(0, 100) \
2321 \
2322 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2323 "Number of consecutive collections before gc time limit fires") \
2324 range(1, max_uintx) \
2325 \
2326 product(intx, PrefetchCopyIntervalInBytes, -1, \
2327 "How far ahead to prefetch destination area (<= 0 means off)") \
2328 \
2329 product(intx, PrefetchScanIntervalInBytes, -1, \
2330 "How far ahead to prefetch scan area (<= 0 means off)") \
2331 \
2332 product(intx, PrefetchFieldsAhead, -1, \
2333 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2334 \
2335 diagnostic(bool, VerifyDuringStartup, false, \
2336 "Verify memory system before executing any Java code " \
2337 "during VM initialization") \
2338 \
2339 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2340 "Verify system before exiting") \
2341 \
2342 diagnostic(bool, VerifyBeforeGC, false, \
2343 "Verify memory system before GC") \
2344 \
2345 diagnostic(bool, VerifyAfterGC, false, \
2346 "Verify memory system after GC") \
2347 \
2348 diagnostic(bool, VerifyDuringGC, false, \
2349 "Verify memory system during GC (between phases)") \
2350 \
2351 diagnostic(bool, GCParallelVerificationEnabled, true, \
2352 "Enable parallel memory system verification") \
2353 \
2354 diagnostic(bool, DeferInitialCardMark, false, \
2355 "When +ReduceInitialCardMarks, explicitly defer any that " \
2356 "may arise from new_pre_store_barrier") \
2357 \
2358 product(bool, UseCondCardMark, false, \
2359 "Check for already marked card before updating card table") \
2360 \
2361 diagnostic(bool, VerifyRememberedSets, false, \
2362 "Verify GC remembered sets") \
2363 \
2364 diagnostic(bool, VerifyObjectStartArray, true, \
2365 "Verify GC object start array if verify before/after") \
2366 \
2367 product(bool, DisableExplicitGC, false, \
2368 "Ignore calls to System.gc()") \
2369 \
2370 notproduct(bool, CheckMemoryInitialization, false, \
2371 "Check memory initialization") \
2372 \
2373 diagnostic(bool, BindCMSThreadToCPU, false, \
2374 "Bind CMS Thread to CPU if possible") \
2375 \
2376 diagnostic(uintx, CPUForCMSThread, 0, \
2377 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2378 \
2379 product(bool, BindGCTaskThreadsToCPUs, false, \
2380 "Bind GCTaskThreads to CPUs if possible") \
2381 \
2382 product(bool, UseGCTaskAffinity, false, \
2383 "Use worker affinity when asking for GCTasks") \
2384 \
2385 product(uintx, ProcessDistributionStride, 4, \
2386 "Stride through processors when distributing processes") \
2387 \
2388 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2389 "Number of times the coordinator GC thread will sleep while " \
2390 "yielding before giving up and resuming GC") \
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 \
2396 /* gc tracing */ \
2397 manageable(bool, PrintGC, false, \
2398 "Print message at garbage collection") \
2399 \
2400 manageable(bool, PrintGCDetails, false, \
2401 "Print more details at garbage collection") \
2402 \
2403 manageable(bool, PrintGCTimeStamps, false, \
2404 "Print timestamps at garbage collection") \
2405 \
2406 develop(intx, ConcGCYieldTimeout, 0, \
2407 "If non-zero, assert that GC threads yield within this " \
2408 "number of milliseconds") \
2409 range(0, max_intx) \
2410 \
2411 product(bool, PrintReferenceGC, false, \
2412 "Print times spent handling reference objects during GC " \
2413 "(enabled only when PrintGCDetails)") \
2414 \
2415 develop(bool, TraceFinalizerRegistration, false, \
2416 "Trace registration of final references") \
2417 \
2418 notproduct(bool, TraceScavenge, false, \
2419 "Trace scavenge") \
2420 \
2421 product(bool, IgnoreEmptyClassPaths, false, \
2422 "Ignore empty path elements in -classpath") \
2423 \
2424 product(bool, TraceClassPaths, false, \
2425 "Trace processing of class paths") \
2426 \
2427 product_rw(bool, TraceClassLoading, false, \
2428 "Trace all classes loaded") \
2429 \
2430 product(bool, TraceClassLoadingPreorder, false, \
2431 "Trace all classes loaded in order referenced (not loaded)") \
2432 \
2433 product_rw(bool, TraceClassUnloading, false, \
2434 "Trace unloading of classes") \
2435 \
2436 product_rw(bool, TraceLoaderConstraints, false, \
2437 "Trace loader constraints") \
2438 \
2439 develop(bool, TraceClassLoaderData, false, \
2440 "Trace class loader loader_data lifetime") \
2441 \
2442 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2443 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2444 "Initial size of the boot class loader data metaspace") \
2445 range(30*K, max_uintx/BytesPerWord) \
2446 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2447 \
2448 product(bool, TraceYoungGenTime, false, \
2449 "Trace accumulated time for young collection") \
2450 \
2451 product(bool, TraceOldGenTime, false, \
2452 "Trace accumulated time for old collection") \
2453 \
2454 product(bool, PrintHeapAtSIGBREAK, true, \
2455 "Print heap layout in response to SIGBREAK") \
2456 \
2457 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2458 "Print a class histogram after any major stop-world GC") \
2459 \
2460 manageable(bool, PrintClassHistogram, false, \
2461 "Print a histogram of class instances") \
2462 \
2463 develop(bool, TraceWorkGang, false, \
2464 "Trace activities of work gangs") \
2465 \
2466 product(bool, TraceParallelOldGCTasks, false, \
2467 "Trace multithreaded GC activity") \
2468 \
2469 develop(bool, TraceGCTaskManager, false, \
2470 "Trace actions of the GC task manager") \
2471 \
2472 develop(bool, TraceGCTaskQueue, false, \
2473 "Trace actions of the GC task queues") \
2474 \
2475 diagnostic(bool, TraceGCTaskThread, false, \
2476 "Trace actions of the GC task threads") \
2477 \
2478 product(bool, PrintParallelOldGCPhaseTimes, false, \
2479 "Print the time taken by each phase in ParallelOldGC " \
2480 "(PrintGCDetails must also be enabled)") \
2481 \
2482 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2483 "Trace marking phase in ParallelOldGC") \
2484 \
2485 develop(bool, TraceParallelOldGCDensePrefix, false, \
2486 "Trace dense prefix computation for ParallelOldGC") \
2487 \
2488 develop(bool, IgnoreLibthreadGPFault, false, \
2489 "Suppress workaround for libthread GP fault") \
2490 \
2491 product(bool, PrintJNIGCStalls, false, \
2492 "Print diagnostic message when GC is stalled " \
2493 "by JNI critical section") \
2494 \
2495 experimental(double, ObjectCountCutOffPercent, 0.5, \
2496 "The percentage of the used heap that the instances of a class " \
2497 "must occupy for the class to generate a trace event") \
2498 range(0.0, 100.0) \
2499 \
2500 /* GC log rotation setting */ \
2501 \
2502 product(bool, UseGCLogFileRotation, false, \
2503 "Rotate gclog files (for long running applications). It requires "\
2504 "-Xloggc:<filename>") \
2505 \
2506 product(uintx, NumberOfGCLogFiles, 0, \
2507 "Number of gclog files in rotation " \
2508 "(default: 0, no rotation)") \
2509 \
2510 product(size_t, GCLogFileSize, 8*K, \
2511 "GC log file size, requires UseGCLogFileRotation. " \
2512 "Set to 0 to only trigger rotation via jcmd") \
2513 \
2514 /* JVMTI heap profiling */ \
2515 \
2516 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2517 "Trace JVMTI object tagging calls") \
2518 \
2519 diagnostic(bool, VerifyBeforeIteration, false, \
2520 "Verify memory system before JVMTI iteration") \
2521 \
2522 /* compiler interface */ \
2523 \
2524 develop(bool, CIPrintCompilerName, false, \
2525 "when CIPrint is active, print the name of the active compiler") \
2526 \
2527 diagnostic(bool, CIPrintCompileQueue, false, \
2528 "display the contents of the compile queue whenever a " \
2529 "compilation is enqueued") \
2530 \
2531 develop(bool, CIPrintRequests, false, \
2532 "display every request for compilation") \
2533 \
2534 product(bool, CITime, false, \
2535 "collect timing information for compilation") \
2536 \
2537 develop(bool, CITimeVerbose, false, \
2538 "be more verbose in compilation timings") \
2539 \
2540 develop(bool, CITimeEach, false, \
2541 "display timing information after each successful compilation") \
2542 \
2543 develop(bool, CICountOSR, false, \
2544 "use a separate counter when assigning ids to osr compilations") \
2545 \
2546 develop(bool, CICompileNatives, true, \
2547 "compile native methods if supported by the compiler") \
2548 \
2549 develop_pd(bool, CICompileOSR, \
2550 "compile on stack replacement methods if supported by the " \
2551 "compiler") \
2552 \
2553 develop(bool, CIPrintMethodCodes, false, \
2554 "print method bytecodes of the compiled code") \
2555 \
2556 develop(bool, CIPrintTypeFlow, false, \
2557 "print the results of ciTypeFlow analysis") \
2558 \
2559 develop(bool, CITraceTypeFlow, false, \
2560 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2561 \
2562 develop(intx, OSROnlyBCI, -1, \
2563 "OSR only at this bci. Negative values mean exclude that bci") \
2564 \
2565 /* compiler */ \
2566 \
2567 /* notice: the max range value here is max_jint, not max_intx */ \
2568 /* because of overflow issue */ \
2569 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2570 "Number of compiler threads to run") \
2571 range(0, max_jint) \
2572 constraint(CICompilerCountConstraintFunc, AtParse) \
2573 \
2574 product(intx, CompilationPolicyChoice, 0, \
2575 "which compilation policy (0-3)") \
2576 range(0, 3) \
2577 \
2578 develop(bool, UseStackBanging, true, \
2579 "use stack banging for stack overflow checks (required for " \
2580 "proper StackOverflow handling; disable only to measure cost " \
2581 "of stackbanging)") \
2582 \
2583 develop(bool, UseStrictFP, true, \
2584 "use strict fp if modifier strictfp is set") \
2585 \
2586 develop(bool, GenerateSynchronizationCode, true, \
2587 "generate locking/unlocking code for synchronized methods and " \
2588 "monitors") \
2589 \
2590 develop(bool, GenerateCompilerNullChecks, true, \
2591 "Generate explicit null checks for loads/stores/calls") \
2592 \
2593 develop(bool, GenerateRangeChecks, true, \
2594 "Generate range checks for array accesses") \
2595 \
2596 develop_pd(bool, ImplicitNullChecks, \
2597 "Generate code for implicit null checks") \
2598 \
2599 product_pd(bool, TrapBasedNullChecks, \
2600 "Generate code for null checks that uses a cmp and trap " \
2601 "instruction raising SIGTRAP. This is only used if an access to" \
2602 "null (+offset) will not raise a SIGSEGV, i.e.," \
2603 "ImplicitNullChecks don't work (PPC64).") \
2604 \
2605 product(bool, PrintSafepointStatistics, false, \
2606 "Print statistics about safepoint synchronization") \
2607 \
2608 product(intx, PrintSafepointStatisticsCount, 300, \
2609 "Total number of safepoint statistics collected " \
2610 "before printing them out") \
2611 range(1, max_intx) \
2612 \
2613 product(intx, PrintSafepointStatisticsTimeout, -1, \
2614 "Print safepoint statistics only when safepoint takes " \
2615 "more than PrintSafepointSatisticsTimeout in millis") \
2616 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2617 NOT_LP64(range(-1, max_intx)) \
2618 \
2619 product(bool, TraceSafepointCleanupTime, false, \
2620 "Print the break down of clean up tasks performed during " \
2621 "safepoint") \
2622 \
2623 product(bool, Inline, true, \
2624 "Enable inlining") \
2625 \
2626 product(bool, ClipInlining, true, \
2627 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2628 \
2629 develop(bool, UseCHA, true, \
2630 "Enable CHA") \
2631 \
2632 product(bool, UseTypeProfile, true, \
2633 "Check interpreter profile for historically monomorphic calls") \
2634 \
2635 diagnostic(bool, PrintInlining, false, \
2636 "Print inlining optimizations") \
2637 \
2638 product(bool, UsePopCountInstruction, false, \
2639 "Use population count instruction") \
2640 \
2641 develop(bool, EagerInitialization, false, \
2642 "Eagerly initialize classes if possible") \
2643 \
2644 diagnostic(bool, LogTouchedMethods, false, \
2645 "Log methods which have been ever touched in runtime") \
2646 \
2647 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2648 "Print all methods that have been ever touched in runtime") \
2649 \
2650 develop(bool, TraceMethodReplacement, false, \
2651 "Print when methods are replaced do to recompilation") \
2652 \
2653 develop(bool, PrintMethodFlushing, false, \
2654 "Print the nmethods being flushed") \
2655 \
2656 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2657 "print statistics about method flushing") \
2658 \
2659 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2660 "Number of compiled code invocations after which " \
2661 "the method is considered as hot by the flusher") \
2662 range(1, max_jint) \
2663 \
2664 diagnostic(intx, MinPassesBeforeFlush, 10, \
2665 "Minimum number of sweeper passes before an nmethod " \
2666 "can be flushed") \
2667 range(0, max_intx) \
2668 \
2669 product(bool, UseCodeAging, true, \
2670 "Insert counter to detect warm methods") \
2671 \
2672 diagnostic(bool, StressCodeAging, false, \
2673 "Start with counters compiled in") \
2674 \
2675 develop(bool, UseRelocIndex, false, \
2676 "Use an index to speed random access to relocations") \
2677 \
2678 develop(bool, StressCodeBuffers, false, \
2679 "Exercise code buffer expansion and other rare state changes") \
2680 \
2681 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2682 "Generate extra debugging information for non-safepoints in " \
2683 "nmethods") \
2684 \
2685 product(bool, PrintVMOptions, false, \
2686 "Print flags that appeared on the command line") \
2687 \
2688 product(bool, IgnoreUnrecognizedVMOptions, false, \
2689 "Ignore unrecognized VM options") \
2690 \
2691 product(bool, PrintCommandLineFlags, false, \
2692 "Print flags specified on command line or set by ergonomics") \
2693 \
2694 product(bool, PrintFlagsInitial, false, \
2695 "Print all VM flags before argument processing and exit VM") \
2696 \
2697 product(bool, PrintFlagsFinal, false, \
2698 "Print all VM flags after argument and ergonomic processing") \
2699 \
2700 notproduct(bool, PrintFlagsWithComments, false, \
2701 "Print all VM flags with default values and descriptions and " \
2702 "exit") \
2703 \
2704 product(bool, PrintFlagsRanges, false, \
2705 "Print VM flags and their ranges and exit VM") \
2706 \
2707 diagnostic(bool, SerializeVMOutput, true, \
2708 "Use a mutex to serialize output to tty and LogFile") \
2709 \
2710 diagnostic(bool, DisplayVMOutput, true, \
2711 "Display all VM output on the tty, independently of LogVMOutput") \
2712 \
2713 diagnostic(bool, LogVMOutput, false, \
2714 "Save VM output to LogFile") \
2715 \
2716 diagnostic(ccstr, LogFile, NULL, \
2717 "If LogVMOutput or LogCompilation is on, save VM output to " \
2718 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2719 \
2720 product(ccstr, ErrorFile, NULL, \
2721 "If an error occurs, save the error data to this file " \
2722 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2723 \
2724 product(bool, DisplayVMOutputToStderr, false, \
2725 "If DisplayVMOutput is true, display all VM output to stderr") \
2726 \
2727 product(bool, DisplayVMOutputToStdout, false, \
2728 "If DisplayVMOutput is true, display all VM output to stdout") \
2729 \
2730 product(bool, UseHeavyMonitors, false, \
2731 "use heavyweight instead of lightweight Java monitors") \
2732 \
2733 product(bool, PrintStringTableStatistics, false, \
2734 "print statistics about the StringTable and SymbolTable") \
2735 \
2736 diagnostic(bool, VerifyStringTableAtExit, false, \
2737 "verify StringTable contents at exit") \
2738 \
2739 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2740 "print histogram of the symbol table") \
2741 \
2742 notproduct(bool, ExitVMOnVerifyError, false, \
2743 "standard exit from VM if bytecode verify error " \
2744 "(only in debug mode)") \
2745 \
2746 diagnostic(ccstr, AbortVMOnException, NULL, \
2747 "Call fatal if this exception is thrown. Example: " \
2748 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2749 \
2750 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2751 "Call fatal if the exception pointed by AbortVMOnException " \
2752 "has this message") \
2753 \
2754 develop(bool, DebugVtables, false, \
2755 "add debugging code to vtable dispatch") \
2756 \
2757 develop(bool, PrintVtables, false, \
2758 "print vtables when printing klass") \
2759 \
2760 notproduct(bool, PrintVtableStats, false, \
2761 "print vtables stats at end of run") \
2762 \
2763 develop(bool, TraceCreateZombies, false, \
2764 "trace creation of zombie nmethods") \
2765 \
2766 notproduct(bool, IgnoreLockingAssertions, false, \
2767 "disable locking assertions (for speed)") \
2768 \
2769 product(bool, RangeCheckElimination, true, \
2770 "Eliminate range checks") \
2771 \
2772 develop_pd(bool, UncommonNullCast, \
2773 "track occurrences of null in casts; adjust compiler tactics") \
2774 \
2775 develop(bool, TypeProfileCasts, true, \
2776 "treat casts like calls for purposes of type profiling") \
2777 \
2778 develop(bool, DelayCompilationDuringStartup, true, \
2779 "Delay invoking the compiler until main application class is " \
2780 "loaded") \
2781 \
2782 develop(bool, CompileTheWorld, false, \
2783 "Compile all methods in all classes in bootstrap class path " \
2784 "(stress test)") \
2785 \
2786 develop(bool, CompileTheWorldPreloadClasses, true, \
2787 "Preload all classes used by a class before start loading") \
2788 \
2789 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2790 "Force a safepoint every n compiles so sweeper can keep up") \
2791 \
2792 develop(bool, FillDelaySlots, true, \
2793 "Fill delay slots (on SPARC only)") \
2794 \
2795 develop(bool, TimeLivenessAnalysis, false, \
2796 "Time computation of bytecode liveness analysis") \
2797 \
2798 develop(bool, TraceLivenessGen, false, \
2799 "Trace the generation of liveness analysis information") \
2800 \
2801 notproduct(bool, TraceLivenessQuery, false, \
2802 "Trace queries of liveness analysis information") \
2803 \
2804 notproduct(bool, CollectIndexSetStatistics, false, \
2805 "Collect information about IndexSets") \
2806 \
2807 develop(bool, UseLoopSafepoints, true, \
2808 "Generate Safepoint nodes in every loop") \
2809 \
2810 develop(intx, FastAllocateSizeLimit, 128*K, \
2811 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2812 "Inline allocations larger than this in doublewords must go slow")\
2813 \
2814 product(bool, AggressiveOpts, false, \
2815 "Enable aggressive optimizations - see arguments.cpp") \
2816 \
2817 product_pd(uintx, TypeProfileLevel, \
2818 "=XYZ, with Z: Type profiling of arguments at call; " \
2819 "Y: Type profiling of return value at call; " \
2820 "X: Type profiling of parameters to methods; " \
2821 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2822 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2823 \
2824 product(intx, TypeProfileArgsLimit, 2, \
2825 "max number of call arguments to consider for type profiling") \
2826 range(0, 16) \
2827 \
2828 product(intx, TypeProfileParmsLimit, 2, \
2829 "max number of incoming parameters to consider for type profiling"\
2830 ", -1 for all") \
2831 range(-1, 64) \
2832 \
2833 /* statistics */ \
2834 develop(bool, CountCompiledCalls, false, \
2835 "Count method invocations") \
2836 \
2837 notproduct(bool, CountRuntimeCalls, false, \
2838 "Count VM runtime calls") \
2839 \
2840 develop(bool, CountJNICalls, false, \
2841 "Count jni method invocations") \
2842 \
2843 notproduct(bool, CountJVMCalls, false, \
2844 "Count jvm method invocations") \
2845 \
2846 notproduct(bool, CountRemovableExceptions, false, \
2847 "Count exceptions that could be replaced by branches due to " \
2848 "inlining") \
2849 \
2850 notproduct(bool, ICMissHistogram, false, \
2851 "Produce histogram of IC misses") \
2852 \
2853 /* interpreter */ \
2854 develop(bool, ClearInterpreterLocals, false, \
2855 "Always clear local variables of interpreter activations upon " \
2856 "entry") \
2857 \
2858 product_pd(bool, RewriteBytecodes, \
2859 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2860 \
2861 product_pd(bool, RewriteFrequentPairs, \
2862 "Rewrite frequently used bytecode pairs into a single bytecode") \
2863 \
2864 diagnostic(bool, PrintInterpreter, false, \
2865 "Print the generated interpreter code") \
2866 \
2867 product(bool, UseInterpreter, true, \
2868 "Use interpreter for non-compiled methods") \
2869 \
2870 develop(bool, UseFastSignatureHandlers, true, \
2871 "Use fast signature handlers for native calls") \
2872 \
2873 product(bool, UseLoopCounter, true, \
2874 "Increment invocation counter on backward branch") \
2875 \
2876 product_pd(bool, UseOnStackReplacement, \
2877 "Use on stack replacement, calls runtime if invoc. counter " \
2878 "overflows in loop") \
2879 \
2880 notproduct(bool, TraceOnStackReplacement, false, \
2881 "Trace on stack replacement") \
2882 \
2883 product_pd(bool, PreferInterpreterNativeStubs, \
2884 "Use always interpreter stubs for native methods invoked via " \
2885 "interpreter") \
2886 \
2887 develop(bool, CountBytecodes, false, \
2888 "Count number of bytecodes executed") \
2889 \
2890 develop(bool, PrintBytecodeHistogram, false, \
2891 "Print histogram of the executed bytecodes") \
2892 \
2893 develop(bool, PrintBytecodePairHistogram, false, \
2894 "Print histogram of the executed bytecode pairs") \
2895 \
2896 diagnostic(bool, PrintSignatureHandlers, false, \
2897 "Print code generated for native method signature handlers") \
2898 \
2899 develop(bool, VerifyOops, false, \
2900 "Do plausibility checks for oops") \
2901 \
2902 develop(bool, CheckUnhandledOops, false, \
2903 "Check for unhandled oops in VM code") \
2904 \
2905 develop(bool, VerifyJNIFields, trueInDebug, \
2906 "Verify jfieldIDs for instance fields") \
2907 \
2908 notproduct(bool, VerifyJNIEnvThread, false, \
2909 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2910 "from JNI") \
2911 \
2912 develop(bool, VerifyFPU, false, \
2913 "Verify FPU state (check for NaN's, etc.)") \
2914 \
2915 develop(bool, VerifyThread, false, \
2916 "Watch the thread register for corruption (SPARC only)") \
2917 \
2918 develop(bool, VerifyActivationFrameSize, false, \
2919 "Verify that activation frame didn't become smaller than its " \
2920 "minimal size") \
2921 \
2922 develop(bool, TraceFrequencyInlining, false, \
2923 "Trace frequency based inlining") \
2924 \
2925 develop_pd(bool, InlineIntrinsics, \
2926 "Inline intrinsics that can be statically resolved") \
2927 \
2928 product_pd(bool, ProfileInterpreter, \
2929 "Profile at the bytecode level during interpretation") \
2930 \
2931 develop(bool, TraceProfileInterpreter, false, \
2932 "Trace profiling at the bytecode level during interpretation. " \
2933 "This outputs the profiling information collected to improve " \
2934 "jit compilation.") \
2935 \
2936 develop_pd(bool, ProfileTraps, \
2937 "Profile deoptimization traps at the bytecode level") \
2938 \
2939 product(intx, ProfileMaturityPercentage, 20, \
2940 "number of method invocations/branches (expressed as % of " \
2941 "CompileThreshold) before using the method's profile") \
2942 range(0, 100) \
2943 \
2944 diagnostic(bool, PrintMethodData, false, \
2945 "Print the results of +ProfileInterpreter at end of run") \
2946 \
2947 develop(bool, VerifyDataPointer, trueInDebug, \
2948 "Verify the method data pointer during interpreter profiling") \
2949 \
2950 develop(bool, VerifyCompiledCode, false, \
2951 "Include miscellaneous runtime verifications in nmethod code; " \
2952 "default off because it disturbs nmethod size heuristics") \
2953 \
2954 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2955 "Manually make GC thread crash then dump java stack trace; " \
2956 "Test only") \
2957 \
2958 /* compilation */ \
2959 product(bool, UseCompiler, true, \
2960 "Use Just-In-Time compilation") \
2961 \
2962 develop(bool, TraceCompilationPolicy, false, \
2963 "Trace compilation policy") \
2964 \
2965 develop(bool, TimeCompilationPolicy, false, \
2966 "Time the compilation policy") \
2967 \
2968 product(bool, UseCounterDecay, true, \
2969 "Adjust recompilation counters") \
2970 \
2971 develop(intx, CounterHalfLifeTime, 30, \
2972 "Half-life time of invocation counters (in seconds)") \
2973 \
2974 develop(intx, CounterDecayMinIntervalLength, 500, \
2975 "The minimum interval (in milliseconds) between invocation of " \
2976 "CounterDecay") \
2977 \
2978 product(bool, AlwaysCompileLoopMethods, false, \
2979 "When using recompilation, never interpret methods " \
2980 "containing loops") \
2981 \
2982 product(bool, DontCompileHugeMethods, true, \
2983 "Do not compile methods > HugeMethodLimit") \
2984 \
2985 /* Bytecode escape analysis estimation. */ \
2986 product(bool, EstimateArgEscape, true, \
2987 "Analyze bytecodes to estimate escape state of arguments") \
2988 \
2989 product(intx, BCEATraceLevel, 0, \
2990 "How much tracing to do of bytecode escape analysis estimates " \
2991 "(0-3)") \
2992 range(0, 3) \
2993 \
2994 product(intx, MaxBCEAEstimateLevel, 5, \
2995 "Maximum number of nested calls that are analyzed by BC EA") \
2996 range(0, max_jint) \
2997 \
2998 product(intx, MaxBCEAEstimateSize, 150, \
2999 "Maximum bytecode size of a method to be analyzed by BC EA") \
3000 range(0, max_jint) \
3001 \
3002 product(intx, AllocatePrefetchStyle, 1, \
3003 "0 = no prefetch, " \
3004 "1 = prefetch instructions for each allocation, " \
3005 "2 = use TLAB watermark to gate allocation prefetch, " \
3006 "3 = use BIS instruction on Sparc for allocation prefetch") \
3007 range(0, 3) \
3008 \
3009 product(intx, AllocatePrefetchDistance, -1, \
3010 "Distance to prefetch ahead of allocation pointer. " \
3011 "-1: use system-specific value (automatically determined") \
3012 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
3013 \
3014 product(intx, AllocatePrefetchLines, 3, \
3015 "Number of lines to prefetch ahead of array allocation pointer") \
3016 range(1, max_jint / 2) \
3017 \
3018 product(intx, AllocateInstancePrefetchLines, 1, \
3019 "Number of lines to prefetch ahead of instance allocation " \
3020 "pointer") \
3021 range(1, max_jint / 2) \
3022 \
3023 product(intx, AllocatePrefetchStepSize, 16, \
3024 "Step size in bytes of sequential prefetch instructions") \
3025 range(1, max_jint) \
3026 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
3027 \
3028 product(intx, AllocatePrefetchInstr, 0, \
3029 "Prefetch instruction to prefetch ahead of allocation pointer") \
3030 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \
3031 \
3032 /* deoptimization */ \
3033 develop(bool, TraceDeoptimization, false, \
3034 "Trace deoptimization") \
3035 \
3036 develop(bool, PrintDeoptimizationDetails, false, \
3037 "Print more information about deoptimization") \
3038 \
3039 develop(bool, DebugDeoptimization, false, \
3040 "Tracing various information while debugging deoptimization") \
3041 \
3042 product(intx, SelfDestructTimer, 0, \
3043 "Will cause VM to terminate after a given time (in minutes) " \
3044 "(0 means off)") \
3045 range(0, max_intx) \
3046 \
3047 product(intx, MaxJavaStackTraceDepth, 1024, \
3048 "The maximum number of lines in the stack trace for Java " \
3049 "exceptions (0 means all)") \
3050 range(0, max_jint/2) \
3051 \
3052 /* notice: the max range value here is max_jint, not max_intx */ \
3053 /* because of overflow issue */ \
3054 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3055 "Guarantee a safepoint (at least) every so many milliseconds " \
3056 "(0 means none)")) \
3057 NOT_EMBEDDED(range(0, max_jint)) \
3058 \
3059 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3060 "Guarantee a safepoint (at least) every so many milliseconds " \
3061 "(0 means none)")) \
3062 EMBEDDED_ONLY(range(0, max_jint)) \
3063 \
3064 product(intx, SafepointTimeoutDelay, 10000, \
3065 "Delay in milliseconds for option SafepointTimeout") \
3066 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
3067 NOT_LP64(range(0, max_intx)) \
3068 \
3069 product(intx, NmethodSweepActivity, 10, \
3070 "Removes cold nmethods from code cache if > 0. Higher values " \
3071 "result in more aggressive sweeping") \
3072 range(0, 2000) \
3073 \
3074 notproduct(bool, LogSweeper, false, \
3075 "Keep a ring buffer of sweeper activity") \
3076 \
3077 notproduct(intx, SweeperLogEntries, 1024, \
3078 "Number of records in the ring buffer of sweeper activity") \
3079 \
3080 notproduct(intx, MemProfilingInterval, 500, \
3081 "Time between each invocation of the MemProfiler") \
3082 \
3083 develop(intx, MallocCatchPtr, -1, \
3084 "Hit breakpoint when mallocing/freeing this pointer") \
3085 \
3086 notproduct(ccstrlist, SuppressErrorAt, "", \
3087 "List of assertions (file:line) to muzzle") \
3088 \
3089 notproduct(size_t, HandleAllocationLimit, 1024, \
3090 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3091 "is used") \
3092 \
3093 develop(size_t, TotalHandleAllocationLimit, 1024, \
3094 "Threshold for total handle allocation when " \
3095 "+TraceHandleAllocation is used") \
3096 \
3097 develop(intx, StackPrintLimit, 100, \
3098 "number of stack frames to print in VM-level stack dump") \
3099 \
3100 notproduct(intx, MaxElementPrintSize, 256, \
3101 "maximum number of elements to print") \
3102 \
3103 notproduct(intx, MaxSubklassPrintSize, 4, \
3104 "maximum number of subklasses to print when printing klass") \
3105 \
3106 product(intx, MaxInlineLevel, 9, \
3107 "maximum number of nested calls that are inlined") \
3108 range(0, max_jint) \
3109 \
3110 product(intx, MaxRecursiveInlineLevel, 1, \
3111 "maximum number of nested recursive calls that are inlined") \
3112 range(0, max_jint) \
3113 \
3114 develop(intx, MaxForceInlineLevel, 100, \
3115 "maximum number of nested calls that are forced for inlining " \
3116 "(using CompileCommand or marked w/ @ForceInline)") \
3117 range(0, max_jint) \
3118 \
3119 product_pd(intx, InlineSmallCode, \
3120 "Only inline already compiled methods if their code size is " \
3121 "less than this") \
3122 range(0, max_jint) \
3123 \
3124 product(intx, MaxInlineSize, 35, \
3125 "The maximum bytecode size of a method to be inlined") \
3126 range(0, max_jint) \
3127 \
3128 product_pd(intx, FreqInlineSize, \
3129 "The maximum bytecode size of a frequent method to be inlined") \
3130 range(0, max_jint) \
3131 \
3132 product(intx, MaxTrivialSize, 6, \
3133 "The maximum bytecode size of a trivial method to be inlined") \
3134 range(0, max_jint) \
3135 \
3136 product(intx, MinInliningThreshold, 250, \
3137 "The minimum invocation count a method needs to have to be " \
3138 "inlined") \
3139 range(0, max_jint) \
3140 \
3141 develop(intx, MethodHistogramCutoff, 100, \
3142 "The cutoff value for method invocation histogram (+CountCalls)") \
3143 \
3144 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3145 "Number of interpreted methods to show in profile") \
3146 \
3147 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3148 "Number of compiled methods to show in profile") \
3149 \
3150 develop(intx, ProfilerNumberOfStubMethods, 25, \
3151 "Number of stub methods to show in profile") \
3152 \
3153 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3154 "Number of runtime stub nodes to show in profile") \
3155 \
3156 product(intx, ProfileIntervalsTicks, 100, \
3157 "Number of ticks between printing of interval profile " \
3158 "(+ProfileIntervals)") \
3159 range(0, max_intx) \
3160 \
3161 notproduct(intx, ScavengeALotInterval, 1, \
3162 "Interval between which scavenge will occur with +ScavengeALot") \
3163 \
3164 notproduct(intx, FullGCALotInterval, 1, \
3165 "Interval between which full gc will occur with +FullGCALot") \
3166 \
3167 notproduct(intx, FullGCALotStart, 0, \
3168 "For which invocation to start FullGCAlot") \
3169 \
3170 notproduct(intx, FullGCALotDummies, 32*K, \
3171 "Dummy object allocated with +FullGCALot, forcing all objects " \
3172 "to move") \
3173 \
3174 develop(intx, DontYieldALotInterval, 10, \
3175 "Interval between which yields will be dropped (milliseconds)") \
3176 \
3177 develop(intx, MinSleepInterval, 1, \
3178 "Minimum sleep() interval (milliseconds) when " \
3179 "ConvertSleepToYield is off (used for Solaris)") \
3180 \
3181 develop(intx, ProfilerPCTickThreshold, 15, \
3182 "Number of ticks in a PC buckets to be a hotspot") \
3183 \
3184 notproduct(intx, DeoptimizeALotInterval, 5, \
3185 "Number of exits until DeoptimizeALot kicks in") \
3186 \
3187 notproduct(intx, ZombieALotInterval, 5, \
3188 "Number of exits until ZombieALot kicks in") \
3189 \
3190 diagnostic(intx, MallocVerifyInterval, 0, \
3191 "If non-zero, verify C heap after every N calls to " \
3192 "malloc/realloc/free") \
3193 range(0, max_intx) \
3194 \
3195 diagnostic(intx, MallocVerifyStart, 0, \
3196 "If non-zero, start verifying C heap after Nth call to " \
3197 "malloc/realloc/free") \
3198 range(0, max_intx) \
3199 \
3200 diagnostic(uintx, MallocMaxTestWords, 0, \
3201 "If non-zero, maximum number of words that malloc/realloc can " \
3202 "allocate (for testing only)") \
3203 range(0, max_uintx) \
3204 \
3205 product(intx, TypeProfileWidth, 2, \
3206 "Number of receiver types to record in call/cast profile") \
3207 range(0, 8) \
3208 \
3209 experimental(intx, MethodProfileWidth, 0, \
3210 "Number of methods to record in call profile") \
3211 \
3212 develop(intx, BciProfileWidth, 2, \
3213 "Number of return bci's to record in ret profile") \
3214 \
3215 product(intx, PerMethodRecompilationCutoff, 400, \
3216 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3217 range(-1, max_intx) \
3218 \
3219 product(intx, PerBytecodeRecompilationCutoff, 200, \
3220 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3221 range(-1, max_intx) \
3222 \
3223 product(intx, PerMethodTrapLimit, 100, \
3224 "Limit on traps (of one kind) in a method (includes inlines)") \
3225 range(0, max_jint) \
3226 \
3227 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3228 "Limit on speculative traps (of one kind) in a method " \
3229 "(includes inlines)") \
3230 range(0, max_jint) \
3231 \
3232 product(intx, PerBytecodeTrapLimit, 4, \
3233 "Limit on traps (of one kind) at a particular BCI") \
3234 range(0, max_jint) \
3235 \
3236 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3237 "Extra method data trap entries for speculation") \
3238 \
3239 develop(intx, InlineFrequencyRatio, 20, \
3240 "Ratio of call site execution to caller method invocation") \
3241 range(0, max_jint) \
3242 \
3243 develop_pd(intx, InlineFrequencyCount, \
3244 "Count of call site execution necessary to trigger frequent " \
3245 "inlining") \
3246 range(0, max_jint) \
3247 \
3248 develop(intx, InlineThrowCount, 50, \
3249 "Force inlining of interpreted methods that throw this often") \
3250 range(0, max_jint) \
3251 \
3252 develop(intx, InlineThrowMaxSize, 200, \
3253 "Force inlining of throwing methods smaller than this") \
3254 range(0, max_jint) \
3255 \
3256 develop(intx, ProfilerNodeSize, 1024, \
3257 "Size in K to allocate for the Profile Nodes of each thread") \
3258 range(0, 1024) \
3259 \
3260 /* gc parameters */ \
3261 product(size_t, InitialHeapSize, 0, \
3262 "Initial heap size (in bytes); zero means use ergonomics") \
3263 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3264 \
3265 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3266 "Maximum heap size (in bytes)") \
3267 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3268 \
3269 product(size_t, OldSize, ScaleForWordSize(4*M), \
3270 "Initial tenured generation size (in bytes)") \
3271 \
3272 product(size_t, NewSize, ScaleForWordSize(1*M), \
3273 "Initial new generation size (in bytes)") \
3274 constraint(NewSizeConstraintFunc,AfterErgo) \
3275 \
3276 product(size_t, MaxNewSize, max_uintx, \
3277 "Maximum new generation size (in bytes), max_uintx means set " \
3278 "ergonomically") \
3279 \
3280 product(size_t, PretenureSizeThreshold, 0, \
3281 "Maximum size in bytes of objects allocated in DefNew " \
3282 "generation; zero means no maximum") \
3283 \
3284 product(size_t, MinTLABSize, 2*K, \
3285 "Minimum allowed TLAB size (in bytes)") \
3286 range(1, max_uintx) \
3287 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3288 \
3289 product(size_t, TLABSize, 0, \
3290 "Starting TLAB size (in bytes); zero means set ergonomically") \
3291 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3292 \
3293 product(size_t, YoungPLABSize, 4096, \
3294 "Size of young gen promotion LAB's (in HeapWords)") \
3295 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3296 \
3297 product(size_t, OldPLABSize, 1024, \
3298 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3299 "of blocks to attempt to claim when refilling CMS LAB's") \
3300 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3301 \
3302 product(uintx, TLABAllocationWeight, 35, \
3303 "Allocation averaging weight") \
3304 range(0, 100) \
3305 \
3306 /* Limit the lower bound of this flag to 1 as it is used */ \
3307 /* in a division expression. */ \
3308 product(uintx, TLABWasteTargetPercent, 1, \
3309 "Percentage of Eden that can be wasted") \
3310 range(1, 100) \
3311 \
3312 product(uintx, TLABRefillWasteFraction, 64, \
3313 "Maximum TLAB waste at a refill (internal fragmentation)") \
3314 range(1, max_uintx) \
3315 \
3316 product(uintx, TLABWasteIncrement, 4, \
3317 "Increment allowed waste at slow allocation") \
3318 \
3319 product(uintx, SurvivorRatio, 8, \
3320 "Ratio of eden/survivor space size") \
3321 range(1, max_uintx-2) \
3322 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3323 \
3324 product(uintx, NewRatio, 2, \
3325 "Ratio of old/new generation sizes") \
3326 range(0, max_uintx-1) \
3327 \
3328 product_pd(size_t, NewSizeThreadIncrease, \
3329 "Additional size added to desired new generation size per " \
3330 "non-daemon thread (in bytes)") \
3331 \
3332 product_pd(size_t, MetaspaceSize, \
3333 "Initial size of Metaspaces (in bytes)") \
3334 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3335 \
3336 product(size_t, MaxMetaspaceSize, max_uintx, \
3337 "Maximum size of Metaspaces (in bytes)") \
3338 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3339 \
3340 product(size_t, CompressedClassSpaceSize, 1*G, \
3341 "Maximum size of class area in Metaspace when compressed " \
3342 "class pointers are used") \
3343 range(1*M, 3*G) \
3344 \
3345 manageable(uintx, MinHeapFreeRatio, 40, \
3346 "The minimum percentage of heap free after GC to avoid expansion."\
3347 " For most GCs this applies to the old generation. In G1 and" \
3348 " ParallelGC it applies to the whole heap.") \
3349 range(0, 100) \
3350 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3351 \
3352 manageable(uintx, MaxHeapFreeRatio, 70, \
3353 "The maximum percentage of heap free after GC to avoid shrinking."\
3354 " For most GCs this applies to the old generation. In G1 and" \
3355 " ParallelGC it applies to the whole heap.") \
3356 range(0, 100) \
3357 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3358 \
3359 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3360 "Number of milliseconds per MB of free space in the heap") \
3361 range(0, max_intx) \
3362 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3363 \
3364 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3365 "The minimum change in heap space due to GC (in bytes)") \
3366 \
3367 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3368 "The minimum expansion of Metaspace (in bytes)") \
3369 \
3370 product(uintx, MaxMetaspaceFreeRatio, 70, \
3371 "The maximum percentage of Metaspace free after GC to avoid " \
3372 "shrinking") \
3373 range(0, 100) \
3374 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3375 \
3376 product(uintx, MinMetaspaceFreeRatio, 40, \
3377 "The minimum percentage of Metaspace free after GC to avoid " \
3378 "expansion") \
3379 range(0, 99) \
3380 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3381 \
3382 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3383 "The maximum expansion of Metaspace without full GC (in bytes)") \
3384 \
3385 product(uintx, QueuedAllocationWarningCount, 0, \
3386 "Number of times an allocation that queues behind a GC " \
3387 "will retry before printing a warning") \
3388 \
3389 diagnostic(uintx, VerifyGCStartAt, 0, \
3390 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3391 \
3392 diagnostic(intx, VerifyGCLevel, 0, \
3393 "Generation level at which to start +VerifyBefore/AfterGC") \
3394 range(0, 1) \
3395 \
3396 product(uintx, MaxTenuringThreshold, 15, \
3397 "Maximum value for tenuring threshold") \
3398 range(0, markOopDesc::max_age + 1) \
3399 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3400 \
3401 product(uintx, InitialTenuringThreshold, 7, \
3402 "Initial value for tenuring threshold") \
3403 range(0, markOopDesc::max_age + 1) \
3404 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3405 \
3406 product(uintx, TargetSurvivorRatio, 50, \
3407 "Desired percentage of survivor space used after scavenge") \
3408 range(0, 100) \
3409 \
3410 product(uintx, MarkSweepDeadRatio, 5, \
3411 "Percentage (0-100) of the old gen allowed as dead wood. " \
3412 "Serial mark sweep treats this as both the minimum and maximum " \
3413 "value. " \
3414 "CMS uses this value only if it falls back to mark sweep. " \
3415 "Par compact uses a variable scale based on the density of the " \
3416 "generation and treats this as the maximum value when the heap " \
3417 "is either completely full or completely empty. Par compact " \
3418 "also has a smaller default value; see arguments.cpp.") \
3419 range(0, 100) \
3420 \
3421 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3422 "How often should we fully compact the heap (ignoring the dead " \
3423 "space parameters)") \
3424 range(1, max_uintx) \
3425 \
3426 product(intx, PrintCMSStatistics, 0, \
3427 "Statistics for CMS") \
3428 \
3429 product(bool, PrintCMSInitiationStatistics, false, \
3430 "Statistics for initiating a CMS collection") \
3431 \
3432 product(intx, PrintFLSStatistics, 0, \
3433 "Statistics for CMS' FreeListSpace") \
3434 \
3435 product(intx, PrintFLSCensus, 0, \
3436 "Census for CMS' FreeListSpace") \
3437 \
3438 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3439 "Delay between expansion and allocation (in milliseconds)") \
3440 \
3441 develop(uintx, GCWorkerDelayMillis, 0, \
3442 "Delay in scheduling GC workers (in milliseconds)") \
3443 \
3444 product(intx, DeferThrSuspendLoopCount, 4000, \
3445 "(Unstable) Number of times to iterate in safepoint loop " \
3446 "before blocking VM threads ") \
3447 range(-1, max_jint-1) \
3448 \
3449 product(intx, DeferPollingPageLoopCount, -1, \
3450 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3451 "before changing safepoint polling page to RO ") \
3452 range(-1, max_jint-1) \
3453 \
3454 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3455 range(0, max_intx) \
3456 \
3457 product(bool, PSChunkLargeArrays, true, \
3458 "Process large arrays in chunks") \
3459 \
3460 product(uintx, GCDrainStackTargetSize, 64, \
3461 "Number of entries we will try to leave on the stack " \
3462 "during parallel gc") \
3463 \
3464 /* stack parameters */ \
3465 product_pd(intx, StackYellowPages, \
3466 "Number of yellow zone (recoverable overflows) pages") \
3467 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3468 \
3469 product_pd(intx, StackRedPages, \
3470 "Number of red zone (unrecoverable overflows) pages") \
3471 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3472 \
3473 /* greater stack shadow pages can't generate instruction to bang stack */ \
3474 product_pd(intx, StackShadowPages, \
3475 "Number of shadow zone (for overflow checking) pages " \
3476 "this should exceed the depth of the VM and native call stack") \
3477 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3478 \
3479 product_pd(intx, ThreadStackSize, \
3480 "Thread Stack Size (in Kbytes)") \
3481 range(0, max_intx-os::vm_page_size()) \
3482 \
3483 product_pd(intx, VMThreadStackSize, \
3484 "Non-Java Thread Stack Size (in Kbytes)") \
3485 range(0, max_intx/(1 * K)) \
3486 \
3487 product_pd(intx, CompilerThreadStackSize, \
3488 "Compiler Thread Stack Size (in Kbytes)") \
3489 range(0, max_intx) \
3490 \
3491 develop_pd(size_t, JVMInvokeMethodSlack, \
3492 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3493 \
3494 /* code cache parameters */ \
3495 /* ppc64/tiered compilation has large code-entry alignment. */ \
3496 develop(uintx, CodeCacheSegmentSize, \
3497 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \
3498 "Code cache segment size (in bytes) - smallest unit of " \
3499 "allocation") \
3500 range(1, 1024) \
3501 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3502 \
3503 develop_pd(intx, CodeEntryAlignment, \
3504 "Code entry alignment for generated code (in bytes)") \
3505 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3506 \
3507 product_pd(intx, OptoLoopAlignment, \
3508 "Align inner loops to zero relative to this modulus") \
3509 range(1, 16) \
3510 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3511 \
3512 product_pd(uintx, InitialCodeCacheSize, \
3513 "Initial code cache size (in bytes)") \
3514 range(0, max_uintx) \
3515 \
3516 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3517 "Minimum code cache size (in bytes) required to start VM.") \
3518 range(0, max_uintx) \
3519 \
3520 product(bool, SegmentedCodeCache, false, \
3521 "Use a segmented code cache") \
3522 \
3523 product_pd(uintx, ReservedCodeCacheSize, \
3524 "Reserved code cache size (in bytes) - maximum code cache size") \
3525 range(0, max_uintx) \
3526 \
3527 product_pd(uintx, NonProfiledCodeHeapSize, \
3528 "Size of code heap with non-profiled methods (in bytes)") \
3529 range(0, max_uintx) \
3530 \
3531 product_pd(uintx, ProfiledCodeHeapSize, \
3532 "Size of code heap with profiled methods (in bytes)") \
3533 range(0, max_uintx) \
3534 \
3535 product_pd(uintx, NonNMethodCodeHeapSize, \
3536 "Size of code heap with non-nmethods (in bytes)") \
3537 range(0, max_uintx) \
3538 \
3539 product_pd(uintx, CodeCacheExpansionSize, \
3540 "Code cache expansion size (in bytes)") \
3541 range(0, max_uintx) \
3542 \
3543 develop_pd(uintx, CodeCacheMinBlockLength, \
3544 "Minimum number of segments in a code cache block") \
3545 range(1, 100) \
3546 \
3547 notproduct(bool, ExitOnFullCodeCache, false, \
3548 "Exit the VM if we fill the code cache") \
3549 \
3550 product(bool, UseCodeCacheFlushing, true, \
3551 "Remove cold/old nmethods from the code cache") \
3552 \
3553 product(uintx, StartAggressiveSweepingAt, 10, \
3554 "Start aggressive sweeping if X[%] of the code cache is free." \
3555 "Segmented code cache: X[%] of the non-profiled heap." \
3556 "Non-segmented code cache: X[%] of the total code cache") \
3557 range(0, 100) \
3558 \
3559 /* interpreter debugging */ \
3560 develop(intx, BinarySwitchThreshold, 5, \
3561 "Minimal number of lookupswitch entries for rewriting to binary " \
3562 "switch") \
3563 \
3564 develop(intx, StopInterpreterAt, 0, \
3565 "Stop interpreter execution at specified bytecode number") \
3566 \
3567 develop(intx, TraceBytecodesAt, 0, \
3568 "Trace bytecodes starting with specified bytecode number") \
3569 \
3570 /* compiler interface */ \
3571 develop(intx, CIStart, 0, \
3572 "The id of the first compilation to permit") \
3573 \
3574 develop(intx, CIStop, max_jint, \
3575 "The id of the last compilation to permit") \
3576 \
3577 develop(intx, CIStartOSR, 0, \
3578 "The id of the first osr compilation to permit " \
3579 "(CICountOSR must be on)") \
3580 \
3581 develop(intx, CIStopOSR, max_jint, \
3582 "The id of the last osr compilation to permit " \
3583 "(CICountOSR must be on)") \
3584 \
3585 develop(intx, CIBreakAtOSR, -1, \
3586 "The id of osr compilation to break at") \
3587 \
3588 develop(intx, CIBreakAt, -1, \
3589 "The id of compilation to break at") \
3590 \
3591 product(ccstrlist, CompileOnly, "", \
3592 "List of methods (pkg/class.name) to restrict compilation to") \
3593 \
3594 product(ccstr, CompileCommandFile, NULL, \
3595 "Read compiler commands from this file [.hotspot_compiler]") \
3596 \
3597 product(ccstrlist, CompileCommand, "", \
3598 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3599 \
3600 develop(bool, ReplayCompiles, false, \
3601 "Enable replay of compilations from ReplayDataFile") \
3602 \
3603 product(ccstr, ReplayDataFile, NULL, \
3604 "File containing compilation replay information" \
3605 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3606 \
3607 product(ccstr, InlineDataFile, NULL, \
3608 "File containing inlining replay information" \
3609 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3610 \
3611 develop(intx, ReplaySuppressInitializers, 2, \
3612 "Control handling of class initialization during replay: " \
3613 "0 - don't do anything special; " \
3614 "1 - treat all class initializers as empty; " \
3615 "2 - treat class initializers for application classes as empty; " \
3616 "3 - allow all class initializers to run during bootstrap but " \
3617 " pretend they are empty after starting replay") \
3618 range(0, 3) \
3619 \
3620 develop(bool, ReplayIgnoreInitErrors, false, \
3621 "Ignore exceptions thrown during initialization for replay") \
3622 \
3623 product(bool, DumpReplayDataOnError, true, \
3624 "Record replay data for crashing compiler threads") \
3625 \
3626 product(bool, CICompilerCountPerCPU, false, \
3627 "1 compiler thread for log(N CPUs)") \
3628 \
3629 develop(intx, CIFireOOMAt, -1, \
3630 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3631 "(non-negative value throws OOM after this many CI accesses " \
3632 "in each compile)") \
3633 notproduct(intx, CICrashAt, -1, \
3634 "id of compilation to trigger assert in compiler thread for " \
3635 "the purpose of testing, e.g. generation of replay data") \
3636 notproduct(bool, CIObjectFactoryVerify, false, \
3637 "enable potentially expensive verification in ciObjectFactory") \
3638 \
3639 /* Priorities */ \
3640 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3641 \
3642 product(intx, ThreadPriorityPolicy, 0, \
3643 "0 : Normal. "\
3644 " VM chooses priorities that are appropriate for normal "\
3645 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3646 " to normal native priority. Java priorities below " \
3647 " NORM_PRIORITY map to lower native priority values. On "\
3648 " Windows applications are allowed to use higher native "\
3649 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3650 " not use the highest possible native priority, "\
3651 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3652 " system threads. On Linux thread priorities are ignored "\
3653 " because the OS does not support static priority in "\
3654 " SCHED_OTHER scheduling class which is the only choice for "\
3655 " non-root, non-realtime applications. "\
3656 "1 : Aggressive. "\
3657 " Java thread priorities map over to the entire range of "\
3658 " native thread priorities. Higher Java thread priorities map "\
3659 " to higher native thread priorities. This policy should be "\
3660 " used with care, as sometimes it can cause performance "\
3661 " degradation in the application and/or the entire system. On "\
3662 " Linux this policy requires root privilege.") \
3663 range(0, 1) \
3664 \
3665 product(bool, ThreadPriorityVerbose, false, \
3666 "Print priority changes") \
3667 \
3668 product(intx, CompilerThreadPriority, -1, \
3669 "The native priority at which compiler threads should run " \
3670 "(-1 means no change)") \
3671 range(min_jint, max_jint) \
3672 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3673 \
3674 product(intx, VMThreadPriority, -1, \
3675 "The native priority at which the VM thread should run " \
3676 "(-1 means no change)") \
3677 range(-1, 127) \
3678 \
3679 product(bool, CompilerThreadHintNoPreempt, true, \
3680 "(Solaris only) Give compiler threads an extra quanta") \
3681 \
3682 product(bool, VMThreadHintNoPreempt, false, \
3683 "(Solaris only) Give VM thread an extra quanta") \
3684 \
3685 product(intx, JavaPriority1_To_OSPriority, -1, \
3686 "Map Java priorities to OS priorities") \
3687 range(-1, 127) \
3688 \
3689 product(intx, JavaPriority2_To_OSPriority, -1, \
3690 "Map Java priorities to OS priorities") \
3691 range(-1, 127) \
3692 \
3693 product(intx, JavaPriority3_To_OSPriority, -1, \
3694 "Map Java priorities to OS priorities") \
3695 range(-1, 127) \
3696 \
3697 product(intx, JavaPriority4_To_OSPriority, -1, \
3698 "Map Java priorities to OS priorities") \
3699 range(-1, 127) \
3700 \
3701 product(intx, JavaPriority5_To_OSPriority, -1, \
3702 "Map Java priorities to OS priorities") \
3703 range(-1, 127) \
3704 \
3705 product(intx, JavaPriority6_To_OSPriority, -1, \
3706 "Map Java priorities to OS priorities") \
3707 range(-1, 127) \
3708 \
3709 product(intx, JavaPriority7_To_OSPriority, -1, \
3710 "Map Java priorities to OS priorities") \
3711 range(-1, 127) \
3712 \
3713 product(intx, JavaPriority8_To_OSPriority, -1, \
3714 "Map Java priorities to OS priorities") \
3715 range(-1, 127) \
3716 \
3717 product(intx, JavaPriority9_To_OSPriority, -1, \
3718 "Map Java priorities to OS priorities") \
3719 range(-1, 127) \
3720 \
3721 product(intx, JavaPriority10_To_OSPriority,-1, \
3722 "Map Java priorities to OS priorities") \
3723 range(-1, 127) \
3724 \
3725 experimental(bool, UseCriticalJavaThreadPriority, false, \
3726 "Java thread priority 10 maps to critical scheduling priority") \
3727 \
3728 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3729 "Compiler thread(s) run at critical scheduling priority") \
3730 \
3731 experimental(bool, UseCriticalCMSThreadPriority, false, \
3732 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3733 \
3734 /* compiler debugging */ \
3735 notproduct(intx, CompileTheWorldStartAt, 1, \
3736 "First class to consider when using +CompileTheWorld") \
3737 \
3738 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3739 "Last class to consider when using +CompileTheWorld") \
3740 \
3741 develop(intx, NewCodeParameter, 0, \
3742 "Testing Only: Create a dedicated integer parameter before " \
3743 "putback") \
3744 \
3745 /* new oopmap storage allocation */ \
3746 develop(intx, MinOopMapAllocation, 8, \
3747 "Minimum number of OopMap entries in an OopMapSet") \
3748 \
3749 /* Background Compilation */ \
3750 develop(intx, LongCompileThreshold, 50, \
3751 "Used with +TraceLongCompiles") \
3752 \
3753 /* recompilation */ \
3754 product_pd(intx, CompileThreshold, \
3755 "number of interpreted method invocations before (re-)compiling") \
3756 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3757 \
3758 product(double, CompileThresholdScaling, 1.0, \
3759 "Factor to control when first compilation happens " \
3760 "(both with and without tiered compilation): " \
3761 "values greater than 1.0 delay counter overflow, " \
3762 "values between 0 and 1.0 rush counter overflow, " \
3763 "value of 1.0 leaves compilation thresholds unchanged " \
3764 "value of 0.0 is equivalent to -Xint. " \
3765 "" \
3766 "Flag can be set as per-method option. " \
3767 "If a value is specified for a method, compilation thresholds " \
3768 "for that method are scaled by both the value of the global flag "\
3769 "and the value of the per-method flag.") \
3770 range(0.0, DBL_MAX) \
3771 \
3772 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3773 "Interpreter (tier 0) invocation notification frequency") \
3774 range(0, 30) \
3775 \
3776 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3777 "C1 without MDO (tier 2) invocation notification frequency") \
3778 range(0, 30) \
3779 \
3780 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3781 "C1 with MDO profiling (tier 3) invocation notification " \
3782 "frequency") \
3783 range(0, 30) \
3784 \
3785 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3786 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3787 range(0, 30) \
3788 \
3789 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3790 "Interpreter (tier 0) invocation notification frequency") \
3791 range(0, 30) \
3792 \
3793 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3794 "C1 without MDO (tier 2) invocation notification frequency") \
3795 range(0, 30) \
3796 \
3797 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3798 "C1 with MDO profiling (tier 3) invocation notification " \
3799 "frequency") \
3800 range(0, 30) \
3801 \
3802 product(intx, Tier2CompileThreshold, 0, \
3803 "threshold at which tier 2 compilation is invoked") \
3804 range(0, max_jint) \
3805 \
3806 product(intx, Tier2BackEdgeThreshold, 0, \
3807 "Back edge threshold at which tier 2 compilation is invoked") \
3808 range(0, max_jint) \
3809 \
3810 product(intx, Tier3InvocationThreshold, 200, \
3811 "Compile if number of method invocations crosses this " \
3812 "threshold") \
3813 range(0, max_jint) \
3814 \
3815 product(intx, Tier3MinInvocationThreshold, 100, \
3816 "Minimum invocation to compile at tier 3") \
3817 range(0, max_jint) \
3818 \
3819 product(intx, Tier3CompileThreshold, 2000, \
3820 "Threshold at which tier 3 compilation is invoked (invocation " \
3821 "minimum must be satisfied)") \
3822 range(0, max_jint) \
3823 \
3824 product(intx, Tier3BackEdgeThreshold, 60000, \
3825 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3826 range(0, max_jint) \
3827 \
3828 product(intx, Tier4InvocationThreshold, 5000, \
3829 "Compile if number of method invocations crosses this " \
3830 "threshold") \
3831 range(0, max_jint) \
3832 \
3833 product(intx, Tier4MinInvocationThreshold, 600, \
3834 "Minimum invocation to compile at tier 4") \
3835 range(0, max_jint) \
3836 \
3837 product(intx, Tier4CompileThreshold, 15000, \
3838 "Threshold at which tier 4 compilation is invoked (invocation " \
3839 "minimum must be satisfied") \
3840 range(0, max_jint) \
3841 \
3842 product(intx, Tier4BackEdgeThreshold, 40000, \
3843 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3844 range(0, max_jint) \
3845 \
3846 product(intx, Tier3DelayOn, 5, \
3847 "If C2 queue size grows over this amount per compiler thread " \
3848 "stop compiling at tier 3 and start compiling at tier 2") \
3849 range(0, max_jint) \
3850 \
3851 product(intx, Tier3DelayOff, 2, \
3852 "If C2 queue size is less than this amount per compiler thread " \
3853 "allow methods compiled at tier 2 transition to tier 3") \
3854 range(0, max_jint) \
3855 \
3856 product(intx, Tier3LoadFeedback, 5, \
3857 "Tier 3 thresholds will increase twofold when C1 queue size " \
3858 "reaches this amount per compiler thread") \
3859 range(0, max_jint) \
3860 \
3861 product(intx, Tier4LoadFeedback, 3, \
3862 "Tier 4 thresholds will increase twofold when C2 queue size " \
3863 "reaches this amount per compiler thread") \
3864 range(0, max_jint) \
3865 \
3866 product(intx, TieredCompileTaskTimeout, 50, \
3867 "Kill compile task if method was not used within " \
3868 "given timeout in milliseconds") \
3869 range(0, max_intx) \
3870 \
3871 product(intx, TieredStopAtLevel, 4, \
3872 "Stop at given compilation level") \
3873 range(0, 4) \
3874 \
3875 product(intx, Tier0ProfilingStartPercentage, 200, \
3876 "Start profiling in interpreter if the counters exceed tier 3 " \
3877 "thresholds by the specified percentage") \
3878 range(0, max_jint) \
3879 \
3880 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3881 "Increase the compile threshold for C1 compilation if the code " \
3882 "cache is filled by the specified percentage") \
3883 range(0, 99) \
3884 \
3885 product(intx, TieredRateUpdateMinTime, 1, \
3886 "Minimum rate sampling interval (in milliseconds)") \
3887 range(0, max_intx) \
3888 \
3889 product(intx, TieredRateUpdateMaxTime, 25, \
3890 "Maximum rate sampling interval (in milliseconds)") \
3891 range(0, max_intx) \
3892 \
3893 product_pd(bool, TieredCompilation, \
3894 "Enable tiered compilation") \
3895 \
3896 product(bool, PrintTieredEvents, false, \
3897 "Print tiered events notifications") \
3898 \
3899 product_pd(intx, OnStackReplacePercentage, \
3900 "NON_TIERED number of method invocations/branches (expressed as " \
3901 "% of CompileThreshold) before (re-)compiling OSR code") \
3902 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3903 \
3904 product(intx, InterpreterProfilePercentage, 33, \
3905 "NON_TIERED number of method invocations/branches (expressed as " \
3906 "% of CompileThreshold) before profiling in the interpreter") \
3907 range(0, 100) \
3908 \
3909 develop(intx, MaxRecompilationSearchLength, 10, \
3910 "The maximum number of frames to inspect when searching for " \
3911 "recompilee") \
3912 \
3913 develop(intx, MaxInterpretedSearchLength, 3, \
3914 "The maximum number of interpreted frames to skip when searching "\
3915 "for recompilee") \
3916 \
3917 develop(intx, DesiredMethodLimit, 8000, \
3918 "The desired maximum method size (in bytecodes) after inlining") \
3919 \
3920 develop(intx, HugeMethodLimit, 8000, \
3921 "Don't compile methods larger than this if " \
3922 "+DontCompileHugeMethods") \
3923 \
3924 /* New JDK 1.4 reflection implementation */ \
3925 \
3926 develop(intx, FastSuperclassLimit, 8, \
3927 "Depth of hardwired instanceof accelerator array") \
3928 \
3929 /* Properties for Java libraries */ \
3930 \
3931 product(size_t, MaxDirectMemorySize, 0, \
3932 "Maximum total size of NIO direct-buffer allocations") \
3933 range(0, (size_t)SIZE_MAX) \
3934 \
3935 /* Flags used for temporary code during development */ \
3936 \
3937 diagnostic(bool, UseNewCode, false, \
3938 "Testing Only: Use the new version while testing") \
3939 \
3940 diagnostic(bool, UseNewCode2, false, \
3941 "Testing Only: Use the new version while testing") \
3942 \
3943 diagnostic(bool, UseNewCode3, false, \
3944 "Testing Only: Use the new version while testing") \
3945 \
3946 /* flags for performance data collection */ \
3947 \
3948 product(bool, UsePerfData, falseInEmbedded, \
3949 "Flag to disable jvmstat instrumentation for performance testing "\
3950 "and problem isolation purposes") \
3951 \
3952 product(bool, PerfDataSaveToFile, false, \
3953 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3954 \
3955 product(ccstr, PerfDataSaveFile, NULL, \
3956 "Save PerfData memory to the specified absolute pathname. " \
3957 "The string %p in the file name (if present) " \
3958 "will be replaced by pid") \
3959 \
3960 product(intx, PerfDataSamplingInterval, 50, \
3961 "Data sampling interval (in milliseconds)") \
3962 range(PeriodicTask::min_interval, max_jint) \
3963 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3964 \
3965 develop(bool, PerfTraceDataCreation, false, \
3966 "Trace creation of Performance Data Entries") \
3967 \
3968 develop(bool, PerfTraceMemOps, false, \
3969 "Trace PerfMemory create/attach/detach calls") \
3970 \
3971 product(bool, PerfDisableSharedMem, false, \
3972 "Store performance data in standard memory") \
3973 \
3974 product(intx, PerfDataMemorySize, 64*K, \
3975 "Size of performance data memory region. Will be rounded " \
3976 "up to a multiple of the native os page size.") \
3977 range(128, 32*64*K) \
3978 \
3979 product(intx, PerfMaxStringConstLength, 1024, \
3980 "Maximum PerfStringConstant string length before truncation") \
3981 range(32, 32*K) \
3982 \
3983 product(bool, PerfAllowAtExitRegistration, false, \
3984 "Allow registration of atexit() methods") \
3985 \
3986 product(bool, PerfBypassFileSystemCheck, false, \
3987 "Bypass Win32 file system criteria checks (Windows Only)") \
3988 \
3989 product(intx, UnguardOnExecutionViolation, 0, \
3990 "Unguard page and retry on no-execute fault (Win32 only) " \
3991 "0=off, 1=conservative, 2=aggressive") \
3992 range(0, 2) \
3993 \
3994 /* Serviceability Support */ \
3995 \
3996 product(bool, ManagementServer, false, \
3997 "Create JMX Management Server") \
3998 \
3999 product(bool, DisableAttachMechanism, false, \
4000 "Disable mechanism that allows tools to attach to this VM") \
4001 \
4002 product(bool, StartAttachListener, false, \
4003 "Always start Attach Listener at VM startup") \
4004 \
4005 manageable(bool, PrintConcurrentLocks, false, \
4006 "Print java.util.concurrent locks in thread dump") \
4007 \
4008 product(bool, TransmitErrorReport, false, \
4009 "Enable error report transmission on erroneous termination") \
4010 \
4011 product(ccstr, ErrorReportServer, NULL, \
4012 "Override built-in error report server address") \
4013 \
4014 /* Shared spaces */ \
4015 \
4016 product(bool, UseSharedSpaces, true, \
4017 "Use shared spaces for metadata") \
4018 \
4019 product(bool, VerifySharedSpaces, false, \
4020 "Verify shared spaces (false for default archive, true for " \
4021 "archive specified by -XX:SharedArchiveFile)") \
4022 \
4023 product(bool, RequireSharedSpaces, false, \
4024 "Require shared spaces for metadata") \
4025 \
4026 product(bool, DumpSharedSpaces, false, \
4027 "Special mode: JVM reads a class list, loads classes, builds " \
4028 "shared spaces, and dumps the shared spaces to a file to be " \
4029 "used in future JVM runs") \
4030 \
4031 product(bool, PrintSharedSpaces, false, \
4032 "Print usage of shared spaces") \
4033 \
4034 product(bool, PrintSharedArchiveAndExit, false, \
4035 "Print shared archive file contents") \
4036 \
4037 product(bool, PrintSharedDictionary, false, \
4038 "If PrintSharedArchiveAndExit is true, also print the shared " \
4039 "dictionary") \
4040 \
4041 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4042 "Size of read-write space for metadata (in bytes)") \
4043 \
4044 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4045 "Size of read-only space for metadata (in bytes)") \
4046 \
4047 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
4048 "Size of the shared miscellaneous data area (in bytes)") \
4049 \
4050 product(uintx, SharedMiscCodeSize, 120*K, \
4051 "Size of the shared miscellaneous code area (in bytes)") \
4052 \
4053 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
4054 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4055 "Address to allocate shared memory region for class data") \
4056 \
4057 product(uintx, SharedSymbolTableBucketSize, 4, \
4058 "Average number of symbols per bucket in shared table") \
4059 range(2, 246) \
4060 \
4061 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4062 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4063 "classes. Just exclude them from the shared dictionary.") \
4064 \
4065 diagnostic(bool, PrintMethodHandleStubs, false, \
4066 "Print generated stub code for method handles") \
4067 \
4068 develop(bool, TraceMethodHandles, false, \
4069 "trace internal method handle operations") \
4070 \
4071 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4072 "perform extra checks when constructing method handles") \
4073 \
4074 diagnostic(bool, ShowHiddenFrames, false, \
4075 "show method handle implementation frames (usually hidden)") \
4076 \
4077 experimental(bool, TrustFinalNonStaticFields, false, \
4078 "trust final non-static declarations for constant folding") \
4079 \
4080 diagnostic(bool, FoldStableValues, true, \
4081 "Optimize loads from stable fields (marked w/ @Stable)") \
4082 \
4083 develop(bool, TraceInvokeDynamic, false, \
4084 "trace internal invoke dynamic operations") \
4085 \
4086 diagnostic(bool, PauseAtStartup, false, \
4087 "Causes the VM to pause at startup time and wait for the pause " \
4088 "file to be removed (default: ./vm.paused.<pid>)") \
4089 \
4090 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4091 "The file to create and for whose removal to await when pausing " \
4092 "at startup. (default: ./vm.paused.<pid>)") \
4093 \
4094 diagnostic(bool, PauseAtExit, false, \
4095 "Pause and wait for keypress on exit if a debugger is attached") \
4096 \
4097 product(bool, ExtendedDTraceProbes, false, \
4098 "Enable performance-impacting dtrace probes") \
4099 \
4100 product(bool, DTraceMethodProbes, false, \
4101 "Enable dtrace probes for method-entry and method-exit") \
4102 \
4103 product(bool, DTraceAllocProbes, false, \
4104 "Enable dtrace probes for object allocation") \
4105 \
4106 product(bool, DTraceMonitorProbes, false, \
4107 "Enable dtrace probes for monitor events") \
4108 \
4109 product(bool, RelaxAccessControlCheck, false, \
4110 "Relax the access control checks in the verifier") \
4111 \
4112 product(uintx, StringTableSize, defaultStringTableSize, \
4113 "Number of buckets in the interned String table") \
4114 range(minimumStringTableSize, 111*defaultStringTableSize) \
4115 \
4116 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4117 "Number of buckets in the JVM internal Symbol table") \
4118 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4119 \
4120 product(bool, UseStringDeduplication, false, \
4121 "Use string deduplication") \
4122 \
4123 product(bool, PrintStringDeduplicationStatistics, false, \
4124 "Print string deduplication statistics") \
4125 \
4126 product(uintx, StringDeduplicationAgeThreshold, 3, \
4127 "A string must reach this age (or be promoted to an old region) " \
4128 "to be considered for deduplication") \
4129 range(1, markOopDesc::max_age) \
4130 \
4131 diagnostic(bool, StringDeduplicationResizeALot, false, \
4132 "Force table resize every time the table is scanned") \
4133 \
4134 diagnostic(bool, StringDeduplicationRehashALot, false, \
4135 "Force table rehash every time the table is scanned") \
4136 \
4137 diagnostic(bool, WhiteBoxAPI, false, \
4138 "Enable internal testing APIs") \
4139 \
4140 product(bool, PrintGCCause, true, \
4141 "Include GC cause in GC logging") \
4142 \
4143 experimental(intx, SurvivorAlignmentInBytes, 0, \
4144 "Default survivor space alignment in bytes") \
4145 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4146 \
4147 product(bool , AllowNonVirtualCalls, false, \
4148 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4149 \
4150 product(ccstr, DumpLoadedClassList, NULL, \
4151 "Dump the names all loaded classes, that could be stored into " \
4152 "the CDS archive, in the specified file") \
4153 \
4154 product(ccstr, SharedClassListFile, NULL, \
4155 "Override the default CDS class list") \
4156 \
4157 diagnostic(ccstr, SharedArchiveFile, NULL, \
4158 "Override the default location of the CDS archive file") \
4159 \
4160 product(ccstr, ExtraSharedClassListFile, NULL, \
4161 "Extra classlist for building the CDS archive file") \
4162 \
4163 experimental(size_t, ArrayAllocatorMallocLimit, \
4164 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4165 "Allocation less than this value will be allocated " \
4166 "using malloc. Larger allocations will use mmap.") \
4167 \
4168 experimental(bool, AlwaysAtomicAccesses, false, \
4169 "Accesses to all variables should always be atomic") \
4170 \
4171 product(bool, EnableTracing, false, \
4172 "Enable event-based tracing") \
4173 \
4174 product(bool, UseLockedTracing, false, \
4175 "Use locked-tracing when doing event-based tracing") \
4176 \
4177 diagnostic(bool, UseUnalignedAccesses, false, \
4178 "Use unaligned memory accesses in Unsafe") \
4179 \
4180 product_pd(bool, PreserveFramePointer, \
4181 "Use the FP register for holding the frame pointer " \
4182 "and not as a general purpose register.") \
4183 \
4184 diagnostic(bool, CheckIntrinsics, true, \
4185 "When a class C is loaded, check that " \
4186 "(1) all intrinsics defined by the VM for class C are present "\
4187 "in the loaded class file and are marked with the " \
4188 "@HotSpotIntrinsicCandidate annotation, that " \
4189 "(2) there is an intrinsic registered for all loaded methods " \
4190 "that are annotated with the @HotSpotIntrinsicCandidate " \
4191 "annotation, and that " \
4192 "(3) no orphan methods exist for class C (i.e., methods for " \
4193 "which the VM declares an intrinsic but that are not declared "\
4194 "in the loaded class C. " \
4195 "Check (3) is available only in debug builds.")
4196
4197 /*
4198 * Macros for factoring of globals
4199 */
4200
4201 // Interface macros
4202 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4203 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4204 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4205 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4206 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4207 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4208 #ifdef PRODUCT
4209 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4210 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4211 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4212 #else
4213 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4214 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4215 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4216 #endif // PRODUCT
4217 // Special LP64 flags, product only needed for now.
4218 #ifdef _LP64
4219 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4220 #else
4221 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4222 #endif // _LP64
4223
4224 // Implementation macros
4225 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4226 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4227 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4228 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4229 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4230 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4231 #ifdef PRODUCT
4232 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4233 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4234 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4235 #else
4236 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4237 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4238 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4239 #endif // PRODUCT
4240 #ifdef _LP64
4241 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4242 #else
4243 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4244 #endif // _LP64
4245
4246 // Only materialize src code for range checking when required, ignore otherwise
4247 #define IGNORE_RANGE(a, b)
4248 // Only materialize src code for contraint checking when required, ignore otherwise
4249 #define IGNORE_CONSTRAINT(func,type)
4250
4251 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4252 DECLARE_PD_DEVELOPER_FLAG, \
4253 DECLARE_PRODUCT_FLAG, \
4254 DECLARE_PD_PRODUCT_FLAG, \
4255 DECLARE_DIAGNOSTIC_FLAG, \
4256 DECLARE_EXPERIMENTAL_FLAG, \
4257 DECLARE_NOTPRODUCT_FLAG, \
4258 DECLARE_MANAGEABLE_FLAG, \
4259 DECLARE_PRODUCT_RW_FLAG, \
4260 DECLARE_LP64_PRODUCT_FLAG, \
4261 IGNORE_RANGE, \
4262 IGNORE_CONSTRAINT)
4263
4264 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4265 DECLARE_PD_DEVELOPER_FLAG, \
4266 DECLARE_PRODUCT_FLAG, \
4267 DECLARE_PD_PRODUCT_FLAG, \
4268 DECLARE_DIAGNOSTIC_FLAG, \
4269 DECLARE_NOTPRODUCT_FLAG, \
4270 IGNORE_RANGE, \
4271 IGNORE_CONSTRAINT)
4272
4273 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4274 DECLARE_PRODUCT_FLAG, \
4275 DECLARE_DIAGNOSTIC_FLAG, \
4276 DECLARE_EXPERIMENTAL_FLAG, \
4277 DECLARE_NOTPRODUCT_FLAG, \
4278 IGNORE_RANGE, \
4279 IGNORE_CONSTRAINT)
4280
4281 // Extensions
4282
4283 #include "runtime/globals_ext.hpp"
4284
4285 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP