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(const char* name, size_t len, bool* value, Flag::Flags origin);
456 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
457
458 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
459 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); }
460 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
461 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
462
463 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
464 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); }
465 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
466 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
467
468 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
469 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); }
470 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
471 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
472
473 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
474 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); }
475 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
476 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
477
478 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
479 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); }
480 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
481 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
482
483 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
484 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); }
485 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
486 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
487
488 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
489 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); }
490 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
491 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
492
493 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
494 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); }
495 // Contract: Flag will make private copy of the incoming value.
496 // Outgoing value is always malloc-ed, and caller MUST call free.
497 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
498 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
499
500 // Returns false if name is not a command line flag.
501 static bool wasSetOnCmdline(const char* name, bool* value);
502 static void printSetFlags(outputStream* out);
503
504 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
505 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
506
507 static void verify() PRODUCT_RETURN;
508 };
509
510 // use this for flags that are true by default in the debug version but
511 // false in the optimized version, and vice versa
512 #ifdef ASSERT
513 #define trueInDebug true
514 #define falseInDebug false
515 #else
516 #define trueInDebug false
517 #define falseInDebug true
518 #endif
519
520 // use this for flags that are true per default in the product build
521 // but false in development builds, and vice versa
522 #ifdef PRODUCT
523 #define trueInProduct true
524 #define falseInProduct false
525 #else
526 #define trueInProduct false
527 #define falseInProduct true
528 #endif
529
530 #ifdef JAVASE_EMBEDDED
531 #define falseInEmbedded false
532 #else
533 #define falseInEmbedded true
534 #endif
535
536 // develop flags are settable / visible only during development and are constant in the PRODUCT version
537 // product flags are always settable / visible
538 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
539
540 // A flag must be declared with one of the following types:
541 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
542 // The type "ccstr" is an alias for "const char*" and is used
543 // only in this file, because the macrology requires single-token type names.
544
545 // Note: Diagnostic options not meant for VM tuning or for product modes.
546 // They are to be used for VM quality assurance or field diagnosis
547 // of VM bugs. They are hidden so that users will not be encouraged to
548 // try them as if they were VM ordinary execution options. However, they
549 // are available in the product version of the VM. Under instruction
550 // from support engineers, VM customers can turn them on to collect
551 // diagnostic information about VM problems. To use a VM diagnostic
552 // option, you must first specify +UnlockDiagnosticVMOptions.
553 // (This master switch also affects the behavior of -Xprintflags.)
554 //
555 // experimental flags are in support of features that are not
556 // part of the officially supported product, but are available
557 // for experimenting with. They could, for example, be performance
558 // features that may not have undergone full or rigorous QA, but which may
559 // help performance in some cases and released for experimentation
560 // by the community of users and developers. This flag also allows one to
561 // be able to build a fully supported product that nonetheless also
562 // ships with some unsupported, lightly tested, experimental features.
563 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
564 // UnlockExperimentalVMOptions flag, which allows the control and
565 // modification of the experimental flags.
566 //
567 // Nota bene: neither diagnostic nor experimental options should be used casually,
568 // and they are not supported on production loads, except under explicit
569 // direction from support engineers.
570 //
571 // manageable flags are writeable external product flags.
572 // They are dynamically writeable through the JDK management interface
573 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
574 // These flags are external exported interface (see CCC). The list of
575 // manageable flags can be queried programmatically through the management
576 // interface.
577 //
578 // A flag can be made as "manageable" only if
579 // - the flag is defined in a CCC as an external exported interface.
580 // - the VM implementation supports dynamic setting of the flag.
581 // This implies that the VM must *always* query the flag variable
582 // and not reuse state related to the flag state at any given time.
583 // - you want the flag to be queried programmatically by the customers.
584 //
585 // product_rw flags are writeable internal product flags.
586 // They are like "manageable" flags but for internal/private use.
587 // The list of product_rw flags are internal/private flags which
588 // may be changed/removed in a future release. It can be set
589 // through the management interface to get/set value
590 // when the name of flag is supplied.
591 //
592 // A flag can be made as "product_rw" only if
593 // - the VM implementation supports dynamic setting of the flag.
594 // This implies that the VM must *always* query the flag variable
595 // and not reuse state related to the flag state at any given time.
596 //
597 // Note that when there is a need to support develop flags to be writeable,
598 // it can be done in the same way as product_rw.
599 //
600 // range is a macro that will expand to min and max arguments for range
601 // checking code if provided - see commandLineFlagRangeList.hpp
602 //
603 // constraint is a macro that will expand to custom function call
604 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
605 //
606
607 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
608 \
609 lp64_product(bool, UseCompressedOops, false, \
610 "Use 32-bit object references in 64-bit VM. " \
611 "lp64_product means flag is always constant in 32 bit VM") \
612 \
613 lp64_product(bool, UseCompressedClassPointers, false, \
614 "Use 32-bit class pointers in 64-bit VM. " \
615 "lp64_product means flag is always constant in 32 bit VM") \
616 \
617 notproduct(bool, CheckCompressedOops, true, \
618 "Generate checks in encoding/decoding code in debug VM") \
619 \
620 product_pd(size_t, HeapBaseMinAddress, \
621 "OS specific low limit for heap base address") \
622 \
623 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
624 "Heap allocation steps through preferred address regions to find" \
625 " where it can allocate the heap. Number of steps to take per " \
626 "region.") \
627 range(1, max_uintx) \
628 \
629 diagnostic(bool, PrintCompressedOopsMode, false, \
630 "Print compressed oops base address and encoding mode") \
631 \
632 lp64_product(intx, ObjectAlignmentInBytes, 8, \
633 "Default object alignment in bytes, 8 is minimum") \
634 range(8, 256) \
635 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
636 \
637 product(bool, AssumeMP, false, \
638 "Instruct the VM to assume multiple processors are available") \
639 \
640 /* UseMembar is theoretically a temp flag used for memory barrier */ \
641 /* removal testing. It was supposed to be removed before FCS but has */ \
642 /* been re-added (see 6401008) */ \
643 product_pd(bool, UseMembar, \
644 "(Unstable) Issues membars on thread state transitions") \
645 \
646 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
647 "Clean the chunk pool asynchronously") \
648 \
649 experimental(bool, AlwaysSafeConstructors, false, \
650 "Force safe construction, as if all fields are final.") \
651 \
652 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
653 "Enable normal processing of flags relating to field diagnostics")\
654 \
655 experimental(bool, UnlockExperimentalVMOptions, false, \
656 "Enable normal processing of flags relating to experimental " \
657 "features") \
658 \
659 product(bool, JavaMonitorsInStackTrace, true, \
660 "Print information about Java monitor locks when the stacks are" \
661 "dumped") \
662 \
663 product_pd(bool, UseLargePages, \
664 "Use large page memory") \
665 \
666 product_pd(bool, UseLargePagesIndividualAllocation, \
667 "Allocate large pages individually for better affinity") \
668 \
669 develop(bool, LargePagesIndividualAllocationInjectError, false, \
670 "Fail large pages individual allocation") \
671 \
672 product(bool, UseLargePagesInMetaspace, false, \
673 "Use large page memory in metaspace. " \
674 "Only used if UseLargePages is enabled.") \
675 \
676 develop(bool, TracePageSizes, false, \
677 "Trace page size selection and usage") \
678 \
679 product(bool, UseNUMA, false, \
680 "Use NUMA if available") \
681 \
682 product(bool, UseNUMAInterleaving, false, \
683 "Interleave memory across NUMA nodes if available") \
684 \
685 product(size_t, NUMAInterleaveGranularity, 2*M, \
686 "Granularity to use for NUMA interleaving on Windows OS") \
687 \
688 product(bool, ForceNUMA, false, \
689 "Force NUMA optimizations on single-node/UMA systems") \
690 \
691 product(uintx, NUMAChunkResizeWeight, 20, \
692 "Percentage (0-100) used to weight the current sample when " \
693 "computing exponentially decaying average for " \
694 "AdaptiveNUMAChunkSizing") \
695 range(0, 100) \
696 \
697 product(size_t, NUMASpaceResizeRate, 1*G, \
698 "Do not reallocate more than this amount per collection") \
699 \
700 product(bool, UseAdaptiveNUMAChunkSizing, true, \
701 "Enable adaptive chunk sizing for NUMA") \
702 \
703 product(bool, NUMAStats, false, \
704 "Print NUMA stats in detailed heap information") \
705 \
706 product(uintx, NUMAPageScanRate, 256, \
707 "Maximum number of pages to include in the page scan procedure") \
708 \
709 product_pd(bool, NeedsDeoptSuspend, \
710 "True for register window machines (sparc/ia64)") \
711 \
712 product(intx, UseSSE, 99, \
713 "Highest supported SSE instructions set on x86/x64") \
714 range(0, 99) \
715 \
716 product(bool, UseAES, false, \
717 "Control whether AES instructions can be used on x86/x64") \
718 \
719 product(bool, UseSHA, false, \
720 "Control whether SHA instructions can be used " \
721 "on SPARC and on ARM") \
722 \
723 product(bool, UseGHASHIntrinsics, false, \
724 "Use intrinsics for GHASH versions of crypto") \
725 \
726 product(size_t, LargePageSizeInBytes, 0, \
727 "Large page size (0 to let VM choose the page size)") \
728 \
729 product(size_t, LargePageHeapSizeThreshold, 128*M, \
730 "Use large pages if maximum heap is at least this big") \
731 \
732 product(bool, ForceTimeHighResolution, false, \
733 "Using high time resolution (for Win32 only)") \
734 \
735 develop(bool, TraceItables, false, \
736 "Trace initialization and use of itables") \
737 \
738 develop(bool, TracePcPatching, false, \
739 "Trace usage of frame::patch_pc") \
740 \
741 develop(bool, TraceJumps, false, \
742 "Trace assembly jumps in thread ring buffer") \
743 \
744 develop(bool, TraceRelocator, false, \
745 "Trace the bytecode relocator") \
746 \
747 develop(bool, TraceLongCompiles, false, \
748 "Print out every time compilation is longer than " \
749 "a given threshold") \
750 \
751 develop(bool, SafepointALot, false, \
752 "Generate a lot of safepoints. This works with " \
753 "GuaranteedSafepointInterval") \
754 \
755 product_pd(bool, BackgroundCompilation, \
756 "A thread requesting compilation is not blocked during " \
757 "compilation") \
758 \
759 product(bool, PrintVMQWaitTime, false, \
760 "Print out the waiting time in VM operation queue") \
761 \
762 develop(bool, TraceOopMapGeneration, false, \
763 "Show OopMapGeneration") \
764 \
765 product(bool, MethodFlushing, true, \
766 "Reclamation of zombie and not-entrant methods") \
767 \
768 develop(bool, VerifyStack, false, \
769 "Verify stack of each thread when it is entering a runtime call") \
770 \
771 diagnostic(bool, ForceUnreachable, false, \
772 "Make all non code cache addresses to be unreachable by " \
773 "forcing use of 64bit literal fixups") \
774 \
775 notproduct(bool, StressDerivedPointers, false, \
776 "Force scavenge when a derived pointer is detected on stack " \
777 "after rtm call") \
778 \
779 develop(bool, TraceDerivedPointers, false, \
780 "Trace traversal of derived pointers on stack") \
781 \
782 notproduct(bool, TraceCodeBlobStacks, false, \
783 "Trace stack-walk of codeblobs") \
784 \
785 product(bool, PrintJNIResolving, false, \
786 "Used to implement -v:jni") \
787 \
788 notproduct(bool, PrintRewrites, false, \
789 "Print methods that are being rewritten") \
790 \
791 product(bool, UseInlineCaches, true, \
792 "Use Inline Caches for virtual calls ") \
793 \
794 develop(bool, InlineArrayCopy, true, \
795 "Inline arraycopy native that is known to be part of " \
796 "base library DLL") \
797 \
798 develop(bool, InlineObjectHash, true, \
799 "Inline Object::hashCode() native that is known to be part " \
800 "of base library DLL") \
801 \
802 develop(bool, InlineNatives, true, \
803 "Inline natives that are known to be part of base library DLL") \
804 \
805 develop(bool, InlineMathNatives, true, \
806 "Inline SinD, CosD, etc.") \
807 \
808 develop(bool, InlineClassNatives, true, \
809 "Inline Class.isInstance, etc") \
810 \
811 develop(bool, InlineThreadNatives, true, \
812 "Inline Thread.currentThread, etc") \
813 \
814 develop(bool, InlineUnsafeOps, true, \
815 "Inline memory ops (native methods) from Unsafe") \
816 \
817 product(bool, CriticalJNINatives, true, \
818 "Check for critical JNI entry points") \
819 \
820 notproduct(bool, StressCriticalJNINatives, false, \
821 "Exercise register saving code in critical natives") \
822 \
823 product(bool, UseSSE42Intrinsics, false, \
824 "SSE4.2 versions of intrinsics") \
825 \
826 product(bool, UseAESIntrinsics, false, \
827 "Use intrinsics for AES versions of crypto") \
828 \
829 product(bool, UseSHA1Intrinsics, false, \
830 "Use intrinsics for SHA-1 crypto hash function. " \
831 "Requires that UseSHA is enabled.") \
832 \
833 product(bool, UseSHA256Intrinsics, false, \
834 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
835 "Requires that UseSHA is enabled.") \
836 \
837 product(bool, UseSHA512Intrinsics, false, \
838 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
839 "Requires that UseSHA is enabled.") \
840 \
841 product(bool, UseCRC32Intrinsics, false, \
842 "use intrinsics for java.util.zip.CRC32") \
843 \
844 product(bool, UseCRC32CIntrinsics, false, \
845 "use intrinsics for java.util.zip.CRC32C") \
846 \
847 product(bool, UseAdler32Intrinsics, false, \
848 "use intrinsics for java.util.zip.Adler32") \
849 \
850 diagnostic(ccstrlist, DisableIntrinsic, "", \
851 "do not expand intrinsics whose (internal) names appear here") \
852 \
853 develop(bool, TraceCallFixup, false, \
854 "Trace all call fixups") \
855 \
856 develop(bool, DeoptimizeALot, false, \
857 "Deoptimize at every exit from the runtime system") \
858 \
859 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
860 "A comma separated list of bcis to deoptimize at") \
861 \
862 product(bool, DeoptimizeRandom, false, \
863 "Deoptimize random frames on random exit from the runtime system")\
864 \
865 notproduct(bool, ZombieALot, false, \
866 "Create zombies (non-entrant) at exit from the runtime system") \
867 \
868 product(bool, UnlinkSymbolsALot, false, \
869 "Unlink unreferenced symbols from the symbol table at safepoints")\
870 \
871 notproduct(bool, WalkStackALot, false, \
872 "Trace stack (no print) at every exit from the runtime system") \
873 \
874 product(bool, Debugging, false, \
875 "Set when executing debug methods in debug.cpp " \
876 "(to prevent triggering assertions)") \
877 \
878 notproduct(bool, StrictSafepointChecks, trueInDebug, \
879 "Enable strict checks that safepoints cannot happen for threads " \
880 "that use No_Safepoint_Verifier") \
881 \
882 notproduct(bool, VerifyLastFrame, false, \
883 "Verify oops on last frame on entry to VM") \
884 \
885 develop(bool, TraceHandleAllocation, false, \
886 "Print out warnings when suspiciously many handles are allocated")\
887 \
888 product(bool, FailOverToOldVerifier, true, \
889 "Fail over to old verifier when split verifier fails") \
890 \
891 develop(bool, ShowSafepointMsgs, false, \
892 "Show message about safepoint synchronization") \
893 \
894 product(bool, SafepointTimeout, false, \
895 "Time out and warn or fail after SafepointTimeoutDelay " \
896 "milliseconds if failed to reach safepoint") \
897 \
898 develop(bool, DieOnSafepointTimeout, false, \
899 "Die upon failure to reach safepoint (see SafepointTimeout)") \
900 \
901 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
902 /* typically, at most a few retries are needed */ \
903 product(intx, SuspendRetryCount, 50, \
904 "Maximum retry count for an external suspend request") \
905 range(0, max_intx) \
906 \
907 product(intx, SuspendRetryDelay, 5, \
908 "Milliseconds to delay per retry (* current_retry_count)") \
909 range(0, max_intx) \
910 \
911 product(bool, AssertOnSuspendWaitFailure, false, \
912 "Assert/Guarantee on external suspend wait failure") \
913 \
914 product(bool, TraceSuspendWaitFailures, false, \
915 "Trace external suspend wait failures") \
916 \
917 product(bool, MaxFDLimit, true, \
918 "Bump the number of file descriptors to maximum in Solaris") \
919 \
920 diagnostic(bool, LogEvents, true, \
921 "Enable the various ring buffer event logs") \
922 \
923 diagnostic(uintx, LogEventsBufferEntries, 10, \
924 "Number of ring buffer event logs") \
925 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
926 \
927 product(bool, BytecodeVerificationRemote, true, \
928 "Enable the Java bytecode verifier for remote classes") \
929 \
930 product(bool, BytecodeVerificationLocal, false, \
931 "Enable the Java bytecode verifier for local classes") \
932 \
933 develop(bool, ForceFloatExceptions, trueInDebug, \
934 "Force exceptions on FP stack under/overflow") \
935 \
936 develop(bool, VerifyStackAtCalls, false, \
937 "Verify that the stack pointer is unchanged after calls") \
938 \
939 develop(bool, TraceJavaAssertions, false, \
940 "Trace java language assertions") \
941 \
942 notproduct(bool, CheckAssertionStatusDirectives, false, \
943 "Temporary - see javaClasses.cpp") \
944 \
945 notproduct(bool, PrintMallocFree, false, \
946 "Trace calls to C heap malloc/free allocation") \
947 \
948 product(bool, PrintOopAddress, false, \
949 "Always print the location of the oop") \
950 \
951 notproduct(bool, VerifyCodeCache, false, \
952 "Verify code cache on memory allocation/deallocation") \
953 \
954 develop(bool, UseMallocOnly, false, \
955 "Use only malloc/free for allocation (no resource area/arena)") \
956 \
957 develop(bool, PrintMalloc, false, \
958 "Print all malloc/free calls") \
959 \
960 develop(bool, PrintMallocStatistics, false, \
961 "Print malloc/free statistics") \
962 \
963 develop(bool, ZapResourceArea, trueInDebug, \
964 "Zap freed resource/arena space with 0xABABABAB") \
965 \
966 notproduct(bool, ZapVMHandleArea, trueInDebug, \
967 "Zap freed VM handle space with 0xBCBCBCBC") \
968 \
969 develop(bool, ZapJNIHandleArea, trueInDebug, \
970 "Zap freed JNI handle space with 0xFEFEFEFE") \
971 \
972 notproduct(bool, ZapStackSegments, trueInDebug, \
973 "Zap allocated/freed stack segments with 0xFADFADED") \
974 \
975 develop(bool, ZapUnusedHeapArea, trueInDebug, \
976 "Zap unused heap space with 0xBAADBABE") \
977 \
978 develop(bool, TraceZapUnusedHeapArea, false, \
979 "Trace zapping of unused heap space") \
980 \
981 develop(bool, CheckZapUnusedHeapArea, false, \
982 "Check zapping of unused heap space") \
983 \
984 develop(bool, ZapFillerObjects, trueInDebug, \
985 "Zap filler objects with 0xDEAFBABE") \
986 \
987 develop(bool, PrintVMMessages, true, \
988 "Print VM messages on console") \
989 \
990 product(bool, PrintGCApplicationConcurrentTime, false, \
991 "Print the time the application has been running") \
992 \
993 product(bool, PrintGCApplicationStoppedTime, false, \
994 "Print the time the application has been stopped") \
995 \
996 diagnostic(bool, VerboseVerification, false, \
997 "Display detailed verification details") \
998 \
999 notproduct(uintx, ErrorHandlerTest, 0, \
1000 "If > 0, provokes an error after VM initialization; the value " \
1001 "determines which error to provoke. See test_error_handler() " \
1002 "in debug.cpp.") \
1003 \
1004 notproduct(uintx, TestCrashInErrorHandler, 0, \
1005 "If > 0, provokes an error inside VM error handler (a secondary " \
1006 "crash). see test_error_handler() in debug.cpp.") \
1007 \
1008 notproduct(bool, TestSafeFetchInErrorHandler, false, \
1009 "If true, tests SafeFetch inside error handler.") \
1010 \
1011 develop(bool, Verbose, false, \
1012 "Print additional debugging information from other modes") \
1013 \
1014 develop(bool, PrintMiscellaneous, false, \
1015 "Print uncategorized debugging information (requires +Verbose)") \
1016 \
1017 develop(bool, WizardMode, false, \
1018 "Print much more debugging information") \
1019 \
1020 product(bool, ShowMessageBoxOnError, false, \
1021 "Keep process alive on VM fatal error") \
1022 \
1023 product(bool, CreateCoredumpOnCrash, true, \
1024 "Create core/mini dump on VM fatal error") \
1025 \
1026 product(uintx, ErrorLogTimeout, 2 * 60, \
1027 "Timeout, in seconds, to limit the time spent on writing an " \
1028 "error log in case of a crash.") \
1029 \
1030 product_pd(bool, UseOSErrorReporting, \
1031 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1032 \
1033 product(bool, SuppressFatalErrorMessage, false, \
1034 "Report NO fatal error message (avoid deadlock)") \
1035 \
1036 product(ccstrlist, OnError, "", \
1037 "Run user-defined commands on fatal error; see VMError.cpp " \
1038 "for examples") \
1039 \
1040 product(ccstrlist, OnOutOfMemoryError, "", \
1041 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1042 \
1043 manageable(bool, HeapDumpBeforeFullGC, false, \
1044 "Dump heap to file before any major stop-the-world GC") \
1045 \
1046 manageable(bool, HeapDumpAfterFullGC, false, \
1047 "Dump heap to file after any major stop-the-world GC") \
1048 \
1049 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1050 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1051 \
1052 manageable(ccstr, HeapDumpPath, NULL, \
1053 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1054 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1055 "in the working directory)") \
1056 \
1057 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1058 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1059 "when the heap usage is larger than this") \
1060 \
1061 develop(size_t, HeapDumpSegmentSize, 1*G, \
1062 "Approximate segment size when generating a segmented heap dump") \
1063 \
1064 develop(bool, BreakAtWarning, false, \
1065 "Execute breakpoint upon encountering VM warning") \
1066 \
1067 develop(bool, TraceVMOperation, false, \
1068 "Trace VM operations") \
1069 \
1070 develop(bool, UseFakeTimers, false, \
1071 "Tell whether the VM should use system time or a fake timer") \
1072 \
1073 product(ccstr, NativeMemoryTracking, "off", \
1074 "Native memory tracking options") \
1075 \
1076 diagnostic(bool, PrintNMTStatistics, false, \
1077 "Print native memory tracking summary data if it is on") \
1078 \
1079 diagnostic(bool, LogCompilation, false, \
1080 "Log compilation activity in detail to LogFile") \
1081 \
1082 product(bool, PrintCompilation, false, \
1083 "Print compilations") \
1084 \
1085 diagnostic(bool, TraceNMethodInstalls, false, \
1086 "Trace nmethod installation") \
1087 \
1088 diagnostic(intx, ScavengeRootsInCode, 2, \
1089 "0: do not allow scavengable oops in the code cache; " \
1090 "1: allow scavenging from the code cache; " \
1091 "2: emit as many constants as the compiler can see") \
1092 range(0, 2) \
1093 \
1094 product(bool, AlwaysRestoreFPU, false, \
1095 "Restore the FPU control word after every JNI call (expensive)") \
1096 \
1097 diagnostic(bool, PrintCompilation2, false, \
1098 "Print additional statistics per compilation") \
1099 \
1100 diagnostic(bool, PrintAdapterHandlers, false, \
1101 "Print code generated for i2c/c2i adapters") \
1102 \
1103 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1104 "Verify that i2c/c2i adapters are called properly") \
1105 \
1106 develop(bool, VerifyAdapterSharing, false, \
1107 "Verify that the code for shared adapters is the equivalent") \
1108 \
1109 diagnostic(bool, PrintAssembly, false, \
1110 "Print assembly code (using external disassembler.so)") \
1111 \
1112 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1113 "Print options string passed to disassembler.so") \
1114 \
1115 notproduct(bool, PrintNMethodStatistics, false, \
1116 "Print a summary statistic for the generated nmethods") \
1117 \
1118 diagnostic(bool, PrintNMethods, false, \
1119 "Print assembly code for nmethods when generated") \
1120 \
1121 diagnostic(intx, PrintNMethodsAtLevel, -1, \
1122 "Only print code for nmethods at the given compilation level") \
1123 \
1124 diagnostic(bool, PrintNativeNMethods, false, \
1125 "Print assembly code for native nmethods when generated") \
1126 \
1127 develop(bool, PrintDebugInfo, false, \
1128 "Print debug information for all nmethods when generated") \
1129 \
1130 develop(bool, PrintRelocations, false, \
1131 "Print relocation information for all nmethods when generated") \
1132 \
1133 develop(bool, PrintDependencies, false, \
1134 "Print dependency information for all nmethods when generated") \
1135 \
1136 develop(bool, PrintExceptionHandlers, false, \
1137 "Print exception handler tables for all nmethods when generated") \
1138 \
1139 develop(bool, StressCompiledExceptionHandlers, false, \
1140 "Exercise compiled exception handlers") \
1141 \
1142 develop(bool, InterceptOSException, false, \
1143 "Start debugger when an implicit OS (e.g. NULL) " \
1144 "exception happens") \
1145 \
1146 product(bool, PrintCodeCache, false, \
1147 "Print the code cache memory usage when exiting") \
1148 \
1149 develop(bool, PrintCodeCache2, false, \
1150 "Print detailed usage information on the code cache when exiting")\
1151 \
1152 product(bool, PrintCodeCacheOnCompilation, false, \
1153 "Print the code cache memory usage each time a method is " \
1154 "compiled") \
1155 \
1156 diagnostic(bool, PrintStubCode, false, \
1157 "Print generated stub code") \
1158 \
1159 product(bool, StackTraceInThrowable, true, \
1160 "Collect backtrace in throwable when exception happens") \
1161 \
1162 product(bool, OmitStackTraceInFastThrow, true, \
1163 "Omit backtraces for some 'hot' exceptions in optimized code") \
1164 \
1165 product(bool, ProfilerPrintByteCodeStatistics, false, \
1166 "Print bytecode statistics when dumping profiler output") \
1167 \
1168 product(bool, ProfilerRecordPC, false, \
1169 "Collect ticks for each 16 byte interval of compiled code") \
1170 \
1171 product(bool, ProfileVM, false, \
1172 "Profile ticks that fall within VM (either in the VM Thread " \
1173 "or VM code called through stubs)") \
1174 \
1175 product(bool, ProfileIntervals, false, \
1176 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1177 \
1178 notproduct(bool, ProfilerCheckIntervals, false, \
1179 "Collect and print information on spacing of profiler ticks") \
1180 \
1181 product(bool, PrintWarnings, true, \
1182 "Print JVM warnings to output stream") \
1183 \
1184 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1185 "Print warnings for stalled SpinLocks") \
1186 \
1187 product(bool, RegisterFinalizersAtInit, true, \
1188 "Register finalizable objects at end of Object.<init> or " \
1189 "after allocation") \
1190 \
1191 develop(bool, RegisterReferences, true, \
1192 "Tell whether the VM should register soft/weak/final/phantom " \
1193 "references") \
1194 \
1195 develop(bool, IgnoreRewrites, false, \
1196 "Suppress rewrites of bytecodes in the oopmap generator. " \
1197 "This is unsafe!") \
1198 \
1199 develop(bool, PrintCodeCacheExtension, false, \
1200 "Print extension of code cache") \
1201 \
1202 develop(bool, UsePrivilegedStack, true, \
1203 "Enable the security JVM functions") \
1204 \
1205 develop(bool, ProtectionDomainVerification, true, \
1206 "Verify protection domain before resolution in system dictionary")\
1207 \
1208 product(bool, ClassUnloading, true, \
1209 "Do unloading of classes") \
1210 \
1211 product(bool, ClassUnloadingWithConcurrentMark, true, \
1212 "Do unloading of classes with a concurrent marking cycle") \
1213 \
1214 develop(bool, DisableStartThread, false, \
1215 "Disable starting of additional Java threads " \
1216 "(for debugging only)") \
1217 \
1218 develop(bool, MemProfiling, false, \
1219 "Write memory usage profiling to log file") \
1220 \
1221 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1222 "Print the system dictionary at exit") \
1223 \
1224 experimental(intx, PredictedLoadedClassCount, 0, \
1225 "Experimental: Tune loaded class cache starting size") \
1226 \
1227 diagnostic(bool, UnsyncloadClass, false, \
1228 "Unstable: VM calls loadClass unsynchronized. Custom " \
1229 "class loader must call VM synchronized for findClass " \
1230 "and defineClass.") \
1231 \
1232 product(bool, AlwaysLockClassLoader, false, \
1233 "Require the VM to acquire the class loader lock before calling " \
1234 "loadClass() even for class loaders registering " \
1235 "as parallel capable") \
1236 \
1237 product(bool, AllowParallelDefineClass, false, \
1238 "Allow parallel defineClass requests for class loaders " \
1239 "registering as parallel capable") \
1240 \
1241 product(bool, MustCallLoadClassInternal, false, \
1242 "Call loadClassInternal() rather than loadClass()") \
1243 \
1244 product_pd(bool, DontYieldALot, \
1245 "Throw away obvious excess yield calls") \
1246 \
1247 product_pd(bool, ConvertSleepToYield, \
1248 "Convert sleep(0) to thread yield " \
1249 "(may be off for Solaris to improve GUI)") \
1250 \
1251 product(bool, ConvertYieldToSleep, false, \
1252 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1253 "behavior") \
1254 \
1255 develop(bool, UseDetachedThreads, true, \
1256 "Use detached threads that are recycled upon termination " \
1257 "(for Solaris only)") \
1258 \
1259 product(bool, UseLWPSynchronization, true, \
1260 "Use LWP-based instead of libthread-based synchronization " \
1261 "(SPARC only)") \
1262 \
1263 experimental(ccstr, SyncKnobs, NULL, \
1264 "(Unstable) Various monitor synchronization tunables") \
1265 \
1266 experimental(intx, EmitSync, 0, \
1267 "(Unsafe, Unstable) " \
1268 "Control emission of inline sync fast-path code") \
1269 \
1270 product(intx, MonitorBound, 0, "Bound Monitor population") \
1271 range(0, max_jint) \
1272 \
1273 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1274 \
1275 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1276 "Experimental Sync flags") \
1277 \
1278 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1279 \
1280 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1281 \
1282 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1283 \
1284 experimental(intx, hashCode, 5, \
1285 "(Unstable) select hashCode generation algorithm") \
1286 \
1287 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1288 "(Unstable, Linux-specific) " \
1289 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1290 \
1291 product(bool, FilterSpuriousWakeups, true, \
1292 "When true prevents OS-level spurious, or premature, wakeups " \
1293 "from Object.wait (Ignored for Windows)") \
1294 \
1295 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1296 \
1297 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1298 \
1299 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1300 \
1301 develop(bool, UsePthreads, false, \
1302 "Use pthread-based instead of libthread-based synchronization " \
1303 "(SPARC only)") \
1304 \
1305 product(bool, ReduceSignalUsage, false, \
1306 "Reduce the use of OS signals in Java and/or the VM") \
1307 \
1308 develop_pd(bool, ShareVtableStubs, \
1309 "Share vtable stubs (smaller code but worse branch prediction") \
1310 \
1311 develop(bool, LoadLineNumberTables, true, \
1312 "Tell whether the class file parser loads line number tables") \
1313 \
1314 develop(bool, LoadLocalVariableTables, true, \
1315 "Tell whether the class file parser loads local variable tables") \
1316 \
1317 develop(bool, LoadLocalVariableTypeTables, true, \
1318 "Tell whether the class file parser loads local variable type" \
1319 "tables") \
1320 \
1321 product(bool, AllowUserSignalHandlers, false, \
1322 "Do not complain if the application installs signal handlers " \
1323 "(Solaris & Linux only)") \
1324 \
1325 product(bool, UseSignalChaining, true, \
1326 "Use signal-chaining to invoke signal handlers installed " \
1327 "by the application (Solaris & Linux only)") \
1328 \
1329 product(bool, UseAltSigs, false, \
1330 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1331 "internal signals (Solaris only)") \
1332 \
1333 product(bool, AllowJNIEnvProxy, false, \
1334 "Allow JNIEnv proxies for jdbx") \
1335 \
1336 product(bool, RestoreMXCSROnJNICalls, false, \
1337 "Restore MXCSR when returning from JNI calls") \
1338 \
1339 product(bool, CheckJNICalls, false, \
1340 "Verify all arguments to JNI calls") \
1341 \
1342 product(bool, CheckEndorsedAndExtDirs, false, \
1343 "Verify the endorsed and extension directories are not used") \
1344 \
1345 product(bool, UseFastJNIAccessors, true, \
1346 "Use optimized versions of Get<Primitive>Field") \
1347 \
1348 product(intx, MaxJNILocalCapacity, 65536, \
1349 "Maximum allowable local JNI handle capacity to " \
1350 "EnsureLocalCapacity() and PushLocalFrame(), " \
1351 "where <= 0 is unlimited, default: 65536") \
1352 range(min_intx, max_intx) \
1353 \
1354 product(bool, EagerXrunInit, false, \
1355 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1356 "but not all -Xrun libraries may support the state of the VM " \
1357 "at this time") \
1358 \
1359 product(bool, PreserveAllAnnotations, false, \
1360 "Preserve RuntimeInvisibleAnnotations as well " \
1361 "as RuntimeVisibleAnnotations") \
1362 \
1363 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1364 "Number of OutOfMemoryErrors preallocated with backtrace") \
1365 \
1366 product(bool, UseXMMForArrayCopy, false, \
1367 "Use SSE2 MOVQ instruction for Arraycopy") \
1368 \
1369 product(intx, FieldsAllocationStyle, 1, \
1370 "0 - type based with oops first, " \
1371 "1 - with oops last, " \
1372 "2 - oops in super and sub classes are together") \
1373 range(0, 2) \
1374 \
1375 product(bool, CompactFields, true, \
1376 "Allocate nonstatic fields in gaps between previous fields") \
1377 \
1378 notproduct(bool, PrintFieldLayout, false, \
1379 "Print field layout for each class") \
1380 \
1381 /* Need to limit the extent of the padding to reasonable size. */\
1382 /* 8K is well beyond the reasonable HW cache line size, even with */\
1383 /* aggressive prefetching, while still leaving the room for segregating */\
1384 /* among the distinct pages. */\
1385 product(intx, ContendedPaddingWidth, 128, \
1386 "How many bytes to pad the fields/classes marked @Contended with")\
1387 range(0, 8192) \
1388 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1389 \
1390 product(bool, EnableContended, true, \
1391 "Enable @Contended annotation support") \
1392 \
1393 product(bool, RestrictContended, true, \
1394 "Restrict @Contended to trusted classes") \
1395 \
1396 product(bool, UseBiasedLocking, true, \
1397 "Enable biased locking in JVM") \
1398 \
1399 product(intx, BiasedLockingStartupDelay, 4000, \
1400 "Number of milliseconds to wait before enabling biased locking") \
1401 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1402 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1403 \
1404 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1405 "Print statistics of biased locking in JVM") \
1406 \
1407 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1408 "Threshold of number of revocations per type to try to " \
1409 "rebias all objects in the heap of that type") \
1410 range(0, max_intx) \
1411 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1412 \
1413 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1414 "Threshold of number of revocations per type to permanently " \
1415 "revoke biases of all objects in the heap of that type") \
1416 range(0, max_intx) \
1417 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1418 \
1419 product(intx, BiasedLockingDecayTime, 25000, \
1420 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1421 "type after previous bulk rebias") \
1422 range(500, max_intx) \
1423 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1424 \
1425 /* tracing */ \
1426 \
1427 notproduct(bool, TraceRuntimeCalls, false, \
1428 "Trace run-time calls") \
1429 \
1430 develop(bool, TraceJNICalls, false, \
1431 "Trace JNI calls") \
1432 \
1433 develop(bool, StressRewriter, false, \
1434 "Stress linktime bytecode rewriting") \
1435 \
1436 notproduct(bool, TraceJVMCalls, false, \
1437 "Trace JVM calls") \
1438 \
1439 product(ccstr, TraceJVMTI, NULL, \
1440 "Trace flags for JVMTI functions and events") \
1441 \
1442 /* This option can change an EMCP method into an obsolete method. */ \
1443 /* This can affect tests that except specific methods to be EMCP. */ \
1444 /* This option should be used with caution. */ \
1445 product(bool, StressLdcRewrite, false, \
1446 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1447 \
1448 product(uintx, TraceRedefineClasses, 0, \
1449 "Trace level for JVMTI RedefineClasses") \
1450 range(0, 0xFFFFFFFF) \
1451 \
1452 /* change to false by default sometime after Mustang */ \
1453 product(bool, VerifyMergedCPBytecodes, true, \
1454 "Verify bytecodes after RedefineClasses constant pool merging") \
1455 \
1456 develop(bool, TraceJNIHandleAllocation, false, \
1457 "Trace allocation/deallocation of JNI handle blocks") \
1458 \
1459 develop(bool, TraceBytecodes, false, \
1460 "Trace bytecode execution") \
1461 \
1462 develop(bool, TraceClassInitialization, false, \
1463 "Trace class initialization") \
1464 \
1465 product(bool, TraceExceptions, false, \
1466 "Trace exceptions") \
1467 \
1468 develop(bool, TraceICs, false, \
1469 "Trace inline cache changes") \
1470 \
1471 notproduct(bool, TraceInvocationCounterOverflow, false, \
1472 "Trace method invocation counter overflow") \
1473 \
1474 develop(bool, TraceInlineCacheClearing, false, \
1475 "Trace clearing of inline caches in nmethods") \
1476 \
1477 develop(bool, TraceDependencies, false, \
1478 "Trace dependencies") \
1479 \
1480 develop(bool, VerifyDependencies, trueInDebug, \
1481 "Exercise and verify the compilation dependency mechanism") \
1482 \
1483 develop(bool, TraceNewOopMapGeneration, false, \
1484 "Trace OopMapGeneration") \
1485 \
1486 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1487 "Trace OopMapGeneration: print detailed cell states") \
1488 \
1489 develop(bool, TimeOopMap, false, \
1490 "Time calls to GenerateOopMap::compute_map() in sum") \
1491 \
1492 develop(bool, TimeOopMap2, false, \
1493 "Time calls to GenerateOopMap::compute_map() individually") \
1494 \
1495 develop(bool, TraceMonitorMismatch, false, \
1496 "Trace monitor matching failures during OopMapGeneration") \
1497 \
1498 develop(bool, TraceOopMapRewrites, false, \
1499 "Trace rewriting of method oops during oop map generation") \
1500 \
1501 develop(bool, TraceSafepoint, false, \
1502 "Trace safepoint operations") \
1503 \
1504 develop(bool, TraceICBuffer, false, \
1505 "Trace usage of IC buffer") \
1506 \
1507 develop(bool, TraceCompiledIC, false, \
1508 "Trace changes of compiled IC") \
1509 \
1510 develop(bool, TraceStartupTime, false, \
1511 "Trace setup time") \
1512 \
1513 develop(bool, TraceProtectionDomainVerification, false, \
1514 "Trace protection domain verification") \
1515 \
1516 develop(bool, TraceClearedExceptions, false, \
1517 "Print when an exception is forcibly cleared") \
1518 \
1519 product(bool, TraceClassResolution, false, \
1520 "Trace all constant pool resolutions (for debugging)") \
1521 \
1522 product(bool, TraceBiasedLocking, false, \
1523 "Trace biased locking in JVM") \
1524 \
1525 product(bool, TraceMonitorInflation, false, \
1526 "Trace monitor inflation in JVM") \
1527 \
1528 /* gc */ \
1529 \
1530 product(bool, UseSerialGC, false, \
1531 "Use the Serial garbage collector") \
1532 \
1533 product(bool, UseG1GC, false, \
1534 "Use the Garbage-First garbage collector") \
1535 \
1536 product(bool, UseParallelGC, false, \
1537 "Use the Parallel Scavenge garbage collector") \
1538 \
1539 product(bool, UseParallelOldGC, false, \
1540 "Use the Parallel Old garbage collector") \
1541 \
1542 product(uintx, HeapMaximumCompactionInterval, 20, \
1543 "How often should we maximally compact the heap (not allowing " \
1544 "any dead space)") \
1545 \
1546 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1547 "The collection count for the first maximum compaction") \
1548 \
1549 product(bool, UseMaximumCompactionOnSystemGC, true, \
1550 "Use maximum compaction in the Parallel Old garbage collector " \
1551 "for a system GC") \
1552 \
1553 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1554 "The mean used by the parallel compact dead wood " \
1555 "limiter (a number between 0-100)") \
1556 range(0, 100) \
1557 \
1558 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1559 "The standard deviation used by the parallel compact dead wood " \
1560 "limiter (a number between 0-100)") \
1561 range(0, 100) \
1562 \
1563 product(uint, ParallelGCThreads, 0, \
1564 "Number of parallel threads parallel gc will use") \
1565 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1566 \
1567 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1568 "Use semaphore synchronization for the GC Threads, " \
1569 "instead of synchronization based on mutexes") \
1570 \
1571 product(bool, UseDynamicNumberOfGCThreads, false, \
1572 "Dynamically choose the number of parallel threads " \
1573 "parallel gc will use") \
1574 \
1575 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1576 "Force dynamic selection of the number of " \
1577 "parallel threads parallel gc will use to aid debugging") \
1578 \
1579 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1580 "Size of heap (bytes) per GC thread used in calculating the " \
1581 "number of GC threads") \
1582 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1583 \
1584 product(bool, TraceDynamicGCThreads, false, \
1585 "Trace the dynamic GC thread usage") \
1586 \
1587 product(uint, ConcGCThreads, 0, \
1588 "Number of threads concurrent gc will use") \
1589 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1590 \
1591 product(uintx, GCTaskTimeStampEntries, 200, \
1592 "Number of time stamp entries per gc worker thread") \
1593 range(1, max_uintx) \
1594 \
1595 product(bool, AlwaysTenure, false, \
1596 "Always tenure objects in eden (ParallelGC only)") \
1597 \
1598 product(bool, NeverTenure, false, \
1599 "Never tenure objects in eden, may tenure on overflow " \
1600 "(ParallelGC only)") \
1601 \
1602 product(bool, ScavengeBeforeFullGC, true, \
1603 "Scavenge youngest generation before each full GC.") \
1604 \
1605 product(bool, UseConcMarkSweepGC, false, \
1606 "Use Concurrent Mark-Sweep GC in the old generation") \
1607 \
1608 product(bool, ExplicitGCInvokesConcurrent, false, \
1609 "A System.gc() request invokes a concurrent collection; " \
1610 "(effective only when using concurrent collectors)") \
1611 \
1612 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1613 "A System.gc() request invokes a concurrent collection and " \
1614 "also unloads classes during such a concurrent gc cycle " \
1615 "(effective only when UseConcMarkSweepGC)") \
1616 \
1617 product(bool, GCLockerInvokesConcurrent, false, \
1618 "The exit of a JNI critical section necessitating a scavenge, " \
1619 "also kicks off a background concurrent collection") \
1620 \
1621 product(uintx, GCLockerEdenExpansionPercent, 5, \
1622 "How much the GC can expand the eden by while the GC locker " \
1623 "is active (as a percentage)") \
1624 range(0, 100) \
1625 \
1626 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1627 "Number of times to retry allocations when " \
1628 "blocked by the GC locker") \
1629 \
1630 product(bool, UseCMSBestFit, true, \
1631 "Use CMS best fit allocation strategy") \
1632 \
1633 product(bool, UseParNewGC, false, \
1634 "Use parallel threads in the new generation") \
1635 \
1636 product(bool, PrintTaskqueue, false, \
1637 "Print taskqueue statistics for parallel collectors") \
1638 \
1639 product(bool, PrintTerminationStats, false, \
1640 "Print termination statistics for parallel collectors") \
1641 \
1642 product(uintx, ParallelGCBufferWastePct, 10, \
1643 "Wasted fraction of parallel allocation buffer") \
1644 range(0, 100) \
1645 \
1646 product(uintx, TargetPLABWastePct, 10, \
1647 "Target wasted space in last buffer as percent of overall " \
1648 "allocation") \
1649 range(1, 100) \
1650 \
1651 product(uintx, PLABWeight, 75, \
1652 "Percentage (0-100) used to weight the current sample when " \
1653 "computing exponentially decaying average for ResizePLAB") \
1654 range(0, 100) \
1655 \
1656 product(bool, ResizePLAB, true, \
1657 "Dynamically resize (survivor space) promotion LAB's") \
1658 \
1659 product(bool, PrintPLAB, false, \
1660 "Print (survivor space) promotion LAB's sizing decisions") \
1661 \
1662 product(intx, ParGCArrayScanChunk, 50, \
1663 "Scan a subset of object array and push remainder, if array is " \
1664 "bigger than this") \
1665 range(1, max_intx) \
1666 \
1667 product(bool, ParGCUseLocalOverflow, false, \
1668 "Instead of a global overflow list, use local overflow stacks") \
1669 \
1670 product(bool, ParGCTrimOverflow, true, \
1671 "Eagerly trim the local overflow lists " \
1672 "(when ParGCUseLocalOverflow)") \
1673 \
1674 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1675 "Simulate work queue overflow in ParNew") \
1676 \
1677 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1678 "An `interval' counter that determines how frequently " \
1679 "we simulate overflow; a smaller number increases frequency") \
1680 \
1681 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1682 "The desired number of objects to claim from the overflow list") \
1683 \
1684 diagnostic(uintx, ParGCStridesPerThread, 2, \
1685 "The number of strides per worker thread that we divide up the " \
1686 "card table scanning work into") \
1687 range(1, max_uintx) \
1688 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1689 \
1690 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1691 "The number of cards in each chunk of the parallel chunks used " \
1692 "during card table scanning") \
1693 range(1, max_intx) \
1694 \
1695 product(uintx, OldPLABWeight, 50, \
1696 "Percentage (0-100) used to weight the current sample when " \
1697 "computing exponentially decaying average for resizing " \
1698 "OldPLABSize") \
1699 range(0, 100) \
1700 \
1701 product(bool, ResizeOldPLAB, true, \
1702 "Dynamically resize (old gen) promotion LAB's") \
1703 \
1704 product(bool, PrintOldPLAB, false, \
1705 "Print (old gen) promotion LAB's sizing decisions") \
1706 \
1707 product(size_t, CMSOldPLABMax, 1024, \
1708 "Maximum size of CMS gen promotion LAB caches per worker " \
1709 "per block size") \
1710 range(1, max_uintx) \
1711 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1712 \
1713 product(size_t, CMSOldPLABMin, 16, \
1714 "Minimum size of CMS gen promotion LAB caches per worker " \
1715 "per block size") \
1716 range(1, max_uintx) \
1717 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1718 \
1719 product(uintx, CMSOldPLABNumRefills, 4, \
1720 "Nominal number of refills of CMS gen promotion LAB cache " \
1721 "per worker per block size") \
1722 range(1, max_uintx) \
1723 \
1724 product(bool, CMSOldPLABResizeQuicker, false, \
1725 "React on-the-fly during a scavenge to a sudden " \
1726 "change in block demand rate") \
1727 \
1728 product(uintx, CMSOldPLABToleranceFactor, 4, \
1729 "The tolerance of the phase-change detector for on-the-fly " \
1730 "PLAB resizing during a scavenge") \
1731 range(1, max_uintx) \
1732 \
1733 product(uintx, CMSOldPLABReactivityFactor, 2, \
1734 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1735 "during a scavenge") \
1736 \
1737 product(bool, AlwaysPreTouch, false, \
1738 "Force all freshly committed pages to be pre-touched") \
1739 \
1740 product_pd(size_t, CMSYoungGenPerWorker, \
1741 "The maximum size of young gen chosen by default per GC worker " \
1742 "thread available") \
1743 range(1, max_uintx) \
1744 \
1745 product(uintx, CMSIncrementalSafetyFactor, 10, \
1746 "Percentage (0-100) used to add conservatism when computing the " \
1747 "duty cycle") \
1748 range(0, 100) \
1749 \
1750 product(uintx, CMSExpAvgFactor, 50, \
1751 "Percentage (0-100) used to weight the current sample when " \
1752 "computing exponential averages for CMS statistics") \
1753 range(0, 100) \
1754 \
1755 product(uintx, CMS_FLSWeight, 75, \
1756 "Percentage (0-100) used to weight the current sample when " \
1757 "computing exponentially decaying averages for CMS FLS " \
1758 "statistics") \
1759 range(0, 100) \
1760 \
1761 product(uintx, CMS_FLSPadding, 1, \
1762 "The multiple of deviation from mean to use for buffering " \
1763 "against volatility in free list demand") \
1764 \
1765 product(uintx, FLSCoalescePolicy, 2, \
1766 "CMS: aggressiveness level for coalescing, increasing " \
1767 "from 0 to 4") \
1768 range(0, 4) \
1769 \
1770 product(bool, FLSAlwaysCoalesceLarge, false, \
1771 "CMS: larger free blocks are always available for coalescing") \
1772 \
1773 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1774 "CMS: the smaller the percentage the greater the coalescing " \
1775 "force") \
1776 range(0.0, 1.0) \
1777 \
1778 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1779 "CMS: the factor by which to inflate estimated demand of small " \
1780 "block sizes to prevent coalescing with an adjoining block") \
1781 range(0.0, DBL_MAX) \
1782 \
1783 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1784 "CMS: the factor by which to inflate estimated demand of large " \
1785 "block sizes to prevent coalescing with an adjoining block") \
1786 range(0.0, DBL_MAX) \
1787 \
1788 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1789 "CMS: the factor by which to inflate estimated demand of small " \
1790 "block sizes to prevent splitting to supply demand for smaller " \
1791 "blocks") \
1792 range(0.0, DBL_MAX) \
1793 \
1794 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1795 "CMS: the factor by which to inflate estimated demand of large " \
1796 "block sizes to prevent splitting to supply demand for smaller " \
1797 "blocks") \
1798 range(0.0, DBL_MAX) \
1799 \
1800 product(bool, CMSExtrapolateSweep, false, \
1801 "CMS: cushion for block demand during sweep") \
1802 \
1803 product(uintx, CMS_SweepWeight, 75, \
1804 "Percentage (0-100) used to weight the current sample when " \
1805 "computing exponentially decaying average for inter-sweep " \
1806 "duration") \
1807 range(0, 100) \
1808 \
1809 product(uintx, CMS_SweepPadding, 1, \
1810 "The multiple of deviation from mean to use for buffering " \
1811 "against volatility in inter-sweep duration") \
1812 \
1813 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1814 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1815 "duration exceeds this threshold in milliseconds") \
1816 \
1817 product(bool, CMSClassUnloadingEnabled, true, \
1818 "Whether class unloading enabled when using CMS GC") \
1819 \
1820 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1821 "When CMS class unloading is enabled, the maximum CMS cycle " \
1822 "count for which classes may not be unloaded") \
1823 \
1824 product(uintx, CMSIndexedFreeListReplenish, 4, \
1825 "Replenish an indexed free list with this number of chunks") \
1826 range(1, max_uintx) \
1827 \
1828 product(bool, CMSReplenishIntermediate, true, \
1829 "Replenish all intermediate free-list caches") \
1830 \
1831 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1832 "When satisfying batched demand, split blocks from the " \
1833 "IndexedFreeList whose size is a multiple of requested size") \
1834 \
1835 product(bool, CMSLoopWarn, false, \
1836 "Warn in case of excessive CMS looping") \
1837 \
1838 /* where does the range max value of (max_jint - 1) come from? */ \
1839 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1840 "Maximum size of marking stack") \
1841 range(1, (max_jint - 1)) \
1842 \
1843 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1844 "Size of marking stack") \
1845 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1846 \
1847 notproduct(bool, CMSMarkStackOverflowALot, false, \
1848 "Simulate frequent marking stack / work queue overflow") \
1849 \
1850 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1851 "An \"interval\" counter that determines how frequently " \
1852 "to simulate overflow; a smaller number increases frequency") \
1853 \
1854 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1855 "Maximum number of abortable preclean iterations, if > 0") \
1856 \
1857 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1858 "Maximum time in abortable preclean (in milliseconds)") \
1859 range(0, max_intx) \
1860 \
1861 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1862 "Nominal minimum work per abortable preclean iteration") \
1863 \
1864 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1865 "Time that we sleep between iterations when not given " \
1866 "enough work per iteration") \
1867 range(0, max_intx) \
1868 \
1869 product(size_t, CMSRescanMultiple, 32, \
1870 "Size (in cards) of CMS parallel rescan task") \
1871 range(1, max_uintx) \
1872 \
1873 product(size_t, CMSConcMarkMultiple, 32, \
1874 "Size (in cards) of CMS concurrent MT marking task") \
1875 range(1, max_uintx) \
1876 \
1877 product(bool, CMSAbortSemantics, false, \
1878 "Whether abort-on-overflow semantics is implemented") \
1879 \
1880 product(bool, CMSParallelInitialMarkEnabled, true, \
1881 "Use the parallel initial mark.") \
1882 \
1883 product(bool, CMSParallelRemarkEnabled, true, \
1884 "Whether parallel remark enabled (only if ParNewGC)") \
1885 \
1886 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1887 "Whether parallel remark of survivor space " \
1888 "enabled (effective only if CMSParallelRemarkEnabled)") \
1889 \
1890 product(bool, CMSPLABRecordAlways, true, \
1891 "Always record survivor space PLAB boundaries (effective only " \
1892 "if CMSParallelSurvivorRemarkEnabled)") \
1893 \
1894 product(bool, CMSEdenChunksRecordAlways, true, \
1895 "Always record eden chunks used for the parallel initial mark " \
1896 "or remark of eden") \
1897 \
1898 product(bool, CMSPrintEdenSurvivorChunks, false, \
1899 "Print the eden and the survivor chunks used for the parallel " \
1900 "initial mark or remark of the eden/survivor spaces") \
1901 \
1902 product(bool, CMSConcurrentMTEnabled, true, \
1903 "Whether multi-threaded concurrent work enabled " \
1904 "(effective only if ParNewGC)") \
1905 \
1906 product(bool, CMSPrecleaningEnabled, true, \
1907 "Whether concurrent precleaning enabled") \
1908 \
1909 product(uintx, CMSPrecleanIter, 3, \
1910 "Maximum number of precleaning iteration passes") \
1911 range(0, 9) \
1912 \
1913 product(uintx, CMSPrecleanDenominator, 3, \
1914 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1915 "ratio") \
1916 range(1, max_uintx) \
1917 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1918 \
1919 product(uintx, CMSPrecleanNumerator, 2, \
1920 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1921 "ratio") \
1922 range(0, max_uintx-1) \
1923 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1924 \
1925 product(bool, CMSPrecleanRefLists1, true, \
1926 "Preclean ref lists during (initial) preclean phase") \
1927 \
1928 product(bool, CMSPrecleanRefLists2, false, \
1929 "Preclean ref lists during abortable preclean phase") \
1930 \
1931 product(bool, CMSPrecleanSurvivors1, false, \
1932 "Preclean survivors during (initial) preclean phase") \
1933 \
1934 product(bool, CMSPrecleanSurvivors2, true, \
1935 "Preclean survivors during abortable preclean phase") \
1936 \
1937 product(uintx, CMSPrecleanThreshold, 1000, \
1938 "Do not iterate again if number of dirty cards is less than this")\
1939 range(100, max_uintx) \
1940 \
1941 product(bool, CMSCleanOnEnter, true, \
1942 "Clean-on-enter optimization for reducing number of dirty cards") \
1943 \
1944 product(uintx, CMSRemarkVerifyVariant, 1, \
1945 "Choose variant (1,2) of verification following remark") \
1946 range(1, 2) \
1947 \
1948 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1949 "If Eden size is below this, do not try to schedule remark") \
1950 \
1951 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1952 "The Eden occupancy percentage (0-100) at which " \
1953 "to try and schedule remark pause") \
1954 range(0, 100) \
1955 \
1956 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1957 "Start sampling eden top at least before young gen " \
1958 "occupancy reaches 1/<ratio> of the size at which " \
1959 "we plan to schedule remark") \
1960 range(1, max_uintx) \
1961 \
1962 product(uintx, CMSSamplingGrain, 16*K, \
1963 "The minimum distance between eden samples for CMS (see above)") \
1964 range(1, max_uintx) \
1965 \
1966 product(bool, CMSScavengeBeforeRemark, false, \
1967 "Attempt scavenge before the CMS remark step") \
1968 \
1969 develop(bool, CMSTraceSweeper, false, \
1970 "Trace some actions of the CMS sweeper") \
1971 \
1972 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1973 "Don't drain below this size per parallel worker/thief") \
1974 range(1, max_juint) \
1975 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1976 \
1977 manageable(intx, CMSWaitDuration, 2000, \
1978 "Time in milliseconds that CMS thread waits for young GC") \
1979 \
1980 develop(uintx, CMSCheckInterval, 1000, \
1981 "Interval in milliseconds that CMS thread checks if it " \
1982 "should start a collection cycle") \
1983 \
1984 product(bool, CMSYield, true, \
1985 "Yield between steps of CMS") \
1986 \
1987 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1988 "Bitmap operations should process at most this many bits " \
1989 "between yields") \
1990 range(1, max_uintx) \
1991 \
1992 product(bool, CMSDumpAtPromotionFailure, false, \
1993 "Dump useful information about the state of the CMS old " \
1994 "generation upon a promotion failure") \
1995 \
1996 product(bool, CMSPrintChunksInDump, false, \
1997 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1998 "more detailed information about the free chunks") \
1999 \
2000 product(bool, CMSPrintObjectsInDump, false, \
2001 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
2002 "more detailed information about the allocated objects") \
2003 \
2004 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
2005 "Verify that all references across the FLS boundary " \
2006 "are to valid objects") \
2007 \
2008 diagnostic(bool, FLSVerifyLists, false, \
2009 "Do lots of (expensive) FreeListSpace verification") \
2010 \
2011 diagnostic(bool, FLSVerifyIndexTable, false, \
2012 "Do lots of (expensive) FLS index table verification") \
2013 \
2014 develop(bool, FLSVerifyDictionary, false, \
2015 "Do lots of (expensive) FLS dictionary verification") \
2016 \
2017 develop(bool, VerifyBlockOffsetArray, false, \
2018 "Do (expensive) block offset array verification") \
2019 \
2020 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2021 "Maintain _unallocated_block in BlockOffsetArray " \
2022 "(currently applicable only to CMS collector)") \
2023 \
2024 develop(bool, TraceCMSState, false, \
2025 "Trace the state of the CMS collection") \
2026 \
2027 product(intx, RefDiscoveryPolicy, 0, \
2028 "Select type of reference discovery policy: " \
2029 "reference-based(0) or referent-based(1)") \
2030 range(ReferenceProcessor::DiscoveryPolicyMin, \
2031 ReferenceProcessor::DiscoveryPolicyMax) \
2032 \
2033 product(bool, ParallelRefProcEnabled, false, \
2034 "Enable parallel reference processing whenever possible") \
2035 \
2036 product(bool, ParallelRefProcBalancingEnabled, true, \
2037 "Enable balancing of reference processing queues") \
2038 \
2039 product(uintx, CMSTriggerRatio, 80, \
2040 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2041 "allocated before a CMS collection cycle commences") \
2042 range(0, 100) \
2043 \
2044 product(uintx, CMSBootstrapOccupancy, 50, \
2045 "Percentage CMS generation occupancy at which to " \
2046 "initiate CMS collection for bootstrapping collection stats") \
2047 range(0, 100) \
2048 \
2049 product(intx, CMSInitiatingOccupancyFraction, -1, \
2050 "Percentage CMS generation occupancy to start a CMS collection " \
2051 "cycle. A negative value means that CMSTriggerRatio is used") \
2052 range(min_intx, 100) \
2053 \
2054 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2055 "Percentage of the (entire) heap occupancy to start a " \
2056 "concurrent GC cycle. It is used by GCs that trigger a " \
2057 "concurrent GC cycle based on the occupancy of the entire heap, " \
2058 "not just one of the generations (e.g., G1). A value of 0 " \
2059 "denotes 'do constant GC cycles'.") \
2060 range(0, 100) \
2061 \
2062 manageable(intx, CMSTriggerInterval, -1, \
2063 "Commence a CMS collection cycle (at least) every so many " \
2064 "milliseconds (0 permanently, -1 disabled)") \
2065 range(-1, max_intx) \
2066 \
2067 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2068 "Only use occupancy as a criterion for starting a CMS collection")\
2069 \
2070 product(uintx, CMSIsTooFullPercentage, 98, \
2071 "An absolute ceiling above which CMS will always consider the " \
2072 "unloading of classes when class unloading is enabled") \
2073 range(0, 100) \
2074 \
2075 notproduct(bool, CMSVerifyReturnedBytes, false, \
2076 "Check that all the garbage collected was returned to the " \
2077 "free lists") \
2078 \
2079 notproduct(bool, ScavengeALot, false, \
2080 "Force scavenge at every Nth exit from the runtime system " \
2081 "(N=ScavengeALotInterval)") \
2082 \
2083 develop(bool, FullGCALot, false, \
2084 "Force full gc at every Nth exit from the runtime system " \
2085 "(N=FullGCALotInterval)") \
2086 \
2087 notproduct(bool, GCALotAtAllSafepoints, false, \
2088 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2089 \
2090 product(bool, PrintPromotionFailure, false, \
2091 "Print additional diagnostic information following " \
2092 "promotion failure") \
2093 \
2094 notproduct(bool, PromotionFailureALot, false, \
2095 "Use promotion failure handling on every youngest generation " \
2096 "collection") \
2097 \
2098 develop(uintx, PromotionFailureALotCount, 1000, \
2099 "Number of promotion failures occurring at PLAB " \
2100 "refill attempts (ParNew) or promotion attempts " \
2101 "(other young collectors)") \
2102 \
2103 develop(uintx, PromotionFailureALotInterval, 5, \
2104 "Total collections between promotion failures a lot") \
2105 \
2106 experimental(uintx, WorkStealingSleepMillis, 1, \
2107 "Sleep time when sleep is used for yields") \
2108 \
2109 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2110 "Number of yields before a sleep is done during work stealing") \
2111 \
2112 experimental(uintx, WorkStealingHardSpins, 4096, \
2113 "Number of iterations in a spin loop between checks on " \
2114 "time out of hard spin") \
2115 \
2116 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2117 "Ratio of hard spins to calls to yield") \
2118 \
2119 develop(uintx, ObjArrayMarkingStride, 512, \
2120 "Number of object array elements to push onto the marking stack " \
2121 "before pushing a continuation entry") \
2122 \
2123 develop(bool, MetadataAllocationFailALot, false, \
2124 "Fail metadata allocations at intervals controlled by " \
2125 "MetadataAllocationFailALotInterval") \
2126 \
2127 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2128 "Metadata allocation failure a lot interval") \
2129 \
2130 develop(bool, TraceMetadataChunkAllocation, false, \
2131 "Trace chunk metadata allocations") \
2132 \
2133 product(bool, TraceMetadataHumongousAllocation, false, \
2134 "Trace humongous metadata allocations") \
2135 \
2136 develop(bool, TraceMetavirtualspaceAllocation, false, \
2137 "Trace virtual space metadata allocations") \
2138 \
2139 notproduct(bool, ExecuteInternalVMTests, false, \
2140 "Enable execution of internal VM tests") \
2141 \
2142 notproduct(bool, VerboseInternalVMTests, false, \
2143 "Turn on logging for internal VM tests.") \
2144 \
2145 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2146 \
2147 product_pd(bool, ResizeTLAB, \
2148 "Dynamically resize TLAB size for threads") \
2149 \
2150 product(bool, ZeroTLAB, false, \
2151 "Zero out the newly created TLAB") \
2152 \
2153 product(bool, FastTLABRefill, true, \
2154 "Use fast TLAB refill code") \
2155 \
2156 product(bool, PrintTLAB, false, \
2157 "Print various TLAB related information") \
2158 \
2159 product(bool, TLABStats, true, \
2160 "Provide more detailed and expensive TLAB statistics " \
2161 "(with PrintTLAB)") \
2162 \
2163 product_pd(bool, NeverActAsServerClassMachine, \
2164 "Never act like a server-class machine") \
2165 \
2166 product(bool, AlwaysActAsServerClassMachine, false, \
2167 "Always act like a server-class machine") \
2168 \
2169 product_pd(uint64_t, MaxRAM, \
2170 "Real memory size (in bytes) used to set maximum heap size") \
2171 range(0, 0XFFFFFFFFFFFFFFFF) \
2172 \
2173 product(size_t, ErgoHeapSizeLimit, 0, \
2174 "Maximum ergonomically set heap size (in bytes); zero means use " \
2175 "MaxRAM / MaxRAMFraction") \
2176 \
2177 product(uintx, MaxRAMFraction, 4, \
2178 "Maximum fraction (1/n) of real memory used for maximum heap " \
2179 "size") \
2180 range(1, max_uintx) \
2181 \
2182 product(uintx, MinRAMFraction, 2, \
2183 "Minimum fraction (1/n) of real memory used for maximum heap " \
2184 "size on systems with small physical memory size") \
2185 range(1, max_uintx) \
2186 \
2187 product(uintx, InitialRAMFraction, 64, \
2188 "Fraction (1/n) of real memory used for initial heap size") \
2189 range(1, max_uintx) \
2190 \
2191 develop(uintx, MaxVirtMemFraction, 2, \
2192 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2193 "determining maximum heap size") \
2194 \
2195 product(bool, UseAutoGCSelectPolicy, false, \
2196 "Use automatic collection selection policy") \
2197 \
2198 product(uintx, AutoGCSelectPauseMillis, 5000, \
2199 "Automatic GC selection pause threshold in milliseconds") \
2200 \
2201 product(bool, UseAdaptiveSizePolicy, true, \
2202 "Use adaptive generation sizing policies") \
2203 \
2204 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2205 "Use adaptive survivor sizing policies") \
2206 \
2207 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2208 "Use adaptive young-old sizing policies at minor collections") \
2209 \
2210 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2211 "Use adaptive young-old sizing policies at major collections") \
2212 \
2213 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2214 "Include statistics from System.gc() for adaptive size policy") \
2215 \
2216 product(bool, UseAdaptiveGCBoundary, false, \
2217 "Allow young-old boundary to move") \
2218 \
2219 develop(bool, TraceAdaptiveGCBoundary, false, \
2220 "Trace young-old boundary moves") \
2221 \
2222 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2223 "Resize the virtual spaces of the young or old generations") \
2224 range(-1, 1) \
2225 \
2226 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2227 "Policy for changing generation size for throughput goals") \
2228 range(0, 1) \
2229 \
2230 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2231 "Number of steps where heuristics is used before data is used") \
2232 \
2233 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2234 "Number of collections before the adaptive sizing is started") \
2235 \
2236 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2237 "Collection interval for printing information; zero means never") \
2238 \
2239 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2240 "Use adaptive minimum footprint as a goal") \
2241 \
2242 product(uintx, AdaptiveSizePolicyWeight, 10, \
2243 "Weight given to exponential resizing, between 0 and 100") \
2244 range(0, 100) \
2245 \
2246 product(uintx, AdaptiveTimeWeight, 25, \
2247 "Weight given to time in adaptive policy, between 0 and 100") \
2248 range(0, 100) \
2249 \
2250 product(uintx, PausePadding, 1, \
2251 "How much buffer to keep for pause time") \
2252 \
2253 product(uintx, PromotedPadding, 3, \
2254 "How much buffer to keep for promotion failure") \
2255 \
2256 product(uintx, SurvivorPadding, 3, \
2257 "How much buffer to keep for survivor overflow") \
2258 \
2259 product(uintx, ThresholdTolerance, 10, \
2260 "Allowed collection cost difference between generations") \
2261 range(0, 100) \
2262 \
2263 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2264 "If collection costs are within margin, reduce both by full " \
2265 "delta") \
2266 \
2267 product(uintx, YoungGenerationSizeIncrement, 20, \
2268 "Adaptive size percentage change in young generation") \
2269 range(0, 100) \
2270 \
2271 product(uintx, YoungGenerationSizeSupplement, 80, \
2272 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2273 range(0, 100) \
2274 \
2275 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2276 "Decay factor to YoungedGenerationSizeSupplement") \
2277 range(1, max_uintx) \
2278 \
2279 product(uintx, TenuredGenerationSizeIncrement, 20, \
2280 "Adaptive size percentage change in tenured generation") \
2281 range(0, 100) \
2282 \
2283 product(uintx, TenuredGenerationSizeSupplement, 80, \
2284 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2285 range(0, 100) \
2286 \
2287 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2288 "Decay factor to TenuredGenerationSizeIncrement") \
2289 range(1, max_uintx) \
2290 \
2291 product(uintx, MaxGCPauseMillis, max_uintx, \
2292 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2293 "or (G1 Only) the maximum GC time per MMU time slice") \
2294 range(1, max_uintx) \
2295 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \
2296 \
2297 product(uintx, GCPauseIntervalMillis, 0, \
2298 "Time slice for MMU specification") \
2299 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \
2300 \
2301 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2302 "Adaptive size policy maximum GC minor pause time goal " \
2303 "in millisecond") \
2304 \
2305 product(uintx, GCTimeRatio, 99, \
2306 "Adaptive size policy application time to GC time ratio") \
2307 \
2308 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2309 "Adaptive size scale down factor for shrinking") \
2310 range(1, max_uintx) \
2311 \
2312 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2313 "Adaptive size decays the major cost for long major intervals") \
2314 \
2315 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2316 "Time scale over which major costs decay") \
2317 \
2318 product(uintx, MinSurvivorRatio, 3, \
2319 "Minimum ratio of young generation/survivor space size") \
2320 range(3, max_uintx) \
2321 \
2322 product(uintx, InitialSurvivorRatio, 8, \
2323 "Initial ratio of young generation/survivor space size") \
2324 \
2325 product(size_t, BaseFootPrintEstimate, 256*M, \
2326 "Estimate of footprint other than Java Heap") \
2327 \
2328 product(bool, UseGCOverheadLimit, true, \
2329 "Use policy to limit of proportion of time spent in GC " \
2330 "before an OutOfMemory error is thrown") \
2331 \
2332 product(uintx, GCTimeLimit, 98, \
2333 "Limit of the proportion of time spent in GC before " \
2334 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2335 range(0, 100) \
2336 \
2337 product(uintx, GCHeapFreeLimit, 2, \
2338 "Minimum percentage of free space after a full GC before an " \
2339 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2340 range(0, 100) \
2341 \
2342 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2343 "Number of consecutive collections before gc time limit fires") \
2344 range(1, max_uintx) \
2345 \
2346 product(bool, PrintAdaptiveSizePolicy, false, \
2347 "Print information about AdaptiveSizePolicy") \
2348 \
2349 product(intx, PrefetchCopyIntervalInBytes, -1, \
2350 "How far ahead to prefetch destination area (<= 0 means off)") \
2351 \
2352 product(intx, PrefetchScanIntervalInBytes, -1, \
2353 "How far ahead to prefetch scan area (<= 0 means off)") \
2354 \
2355 product(intx, PrefetchFieldsAhead, -1, \
2356 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2357 \
2358 diagnostic(bool, VerifySilently, false, \
2359 "Do not print the verification progress") \
2360 \
2361 diagnostic(bool, VerifyDuringStartup, false, \
2362 "Verify memory system before executing any Java code " \
2363 "during VM initialization") \
2364 \
2365 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2366 "Verify system before exiting") \
2367 \
2368 diagnostic(bool, VerifyBeforeGC, false, \
2369 "Verify memory system before GC") \
2370 \
2371 diagnostic(bool, VerifyAfterGC, false, \
2372 "Verify memory system after GC") \
2373 \
2374 diagnostic(bool, VerifyDuringGC, false, \
2375 "Verify memory system during GC (between phases)") \
2376 \
2377 diagnostic(bool, GCParallelVerificationEnabled, true, \
2378 "Enable parallel memory system verification") \
2379 \
2380 diagnostic(bool, DeferInitialCardMark, false, \
2381 "When +ReduceInitialCardMarks, explicitly defer any that " \
2382 "may arise from new_pre_store_barrier") \
2383 \
2384 product(bool, UseCondCardMark, false, \
2385 "Check for already marked card before updating card table") \
2386 \
2387 diagnostic(bool, VerifyRememberedSets, false, \
2388 "Verify GC remembered sets") \
2389 \
2390 diagnostic(bool, VerifyObjectStartArray, true, \
2391 "Verify GC object start array if verify before/after") \
2392 \
2393 product(bool, DisableExplicitGC, false, \
2394 "Ignore calls to System.gc()") \
2395 \
2396 notproduct(bool, CheckMemoryInitialization, false, \
2397 "Check memory initialization") \
2398 \
2399 diagnostic(bool, BindCMSThreadToCPU, false, \
2400 "Bind CMS Thread to CPU if possible") \
2401 \
2402 diagnostic(uintx, CPUForCMSThread, 0, \
2403 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2404 \
2405 product(bool, BindGCTaskThreadsToCPUs, false, \
2406 "Bind GCTaskThreads to CPUs if possible") \
2407 \
2408 product(bool, UseGCTaskAffinity, false, \
2409 "Use worker affinity when asking for GCTasks") \
2410 \
2411 product(uintx, ProcessDistributionStride, 4, \
2412 "Stride through processors when distributing processes") \
2413 \
2414 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2415 "Number of times the coordinator GC thread will sleep while " \
2416 "yielding before giving up and resuming GC") \
2417 \
2418 product(uintx, CMSYieldSleepCount, 0, \
2419 "Number of times a GC thread (minus the coordinator) " \
2420 "will sleep while yielding before giving up and resuming GC") \
2421 \
2422 /* gc tracing */ \
2423 manageable(bool, PrintGC, false, \
2424 "Print message at garbage collection") \
2425 \
2426 manageable(bool, PrintGCDetails, false, \
2427 "Print more details at garbage collection") \
2428 \
2429 manageable(bool, PrintGCDateStamps, false, \
2430 "Print date stamps at garbage collection") \
2431 \
2432 manageable(bool, PrintGCTimeStamps, false, \
2433 "Print timestamps at garbage collection") \
2434 \
2435 manageable(bool, PrintGCID, true, \
2436 "Print an identifier for each garbage collection") \
2437 \
2438 product(bool, PrintGCTaskTimeStamps, false, \
2439 "Print timestamps for individual gc worker thread tasks") \
2440 \
2441 develop(intx, ConcGCYieldTimeout, 0, \
2442 "If non-zero, assert that GC threads yield within this " \
2443 "number of milliseconds") \
2444 range(0, max_intx) \
2445 \
2446 product(bool, PrintReferenceGC, false, \
2447 "Print times spent handling reference objects during GC " \
2448 "(enabled only when PrintGCDetails)") \
2449 \
2450 develop(bool, TraceReferenceGC, false, \
2451 "Trace handling of soft/weak/final/phantom references") \
2452 \
2453 develop(bool, TraceFinalizerRegistration, false, \
2454 "Trace registration of final references") \
2455 \
2456 notproduct(bool, TraceScavenge, false, \
2457 "Trace scavenge") \
2458 \
2459 product(bool, IgnoreEmptyClassPaths, false, \
2460 "Ignore empty path elements in -classpath") \
2461 \
2462 product(bool, TraceClassPaths, false, \
2463 "Trace processing of class paths") \
2464 \
2465 product_rw(bool, TraceClassLoading, false, \
2466 "Trace all classes loaded") \
2467 \
2468 product(bool, TraceClassLoadingPreorder, false, \
2469 "Trace all classes loaded in order referenced (not loaded)") \
2470 \
2471 product_rw(bool, TraceClassUnloading, false, \
2472 "Trace unloading of classes") \
2473 \
2474 product_rw(bool, TraceLoaderConstraints, false, \
2475 "Trace loader constraints") \
2476 \
2477 develop(bool, TraceClassLoaderData, false, \
2478 "Trace class loader loader_data lifetime") \
2479 \
2480 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2481 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2482 "Initial size of the boot class loader data metaspace") \
2483 range(30*K, max_uintx/BytesPerWord) \
2484 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2485 \
2486 product(bool, TraceYoungGenTime, false, \
2487 "Trace accumulated time for young collection") \
2488 \
2489 product(bool, TraceOldGenTime, false, \
2490 "Trace accumulated time for old collection") \
2491 \
2492 product(bool, PrintTenuringDistribution, false, \
2493 "Print tenuring age information") \
2494 \
2495 product_rw(bool, PrintHeapAtGC, false, \
2496 "Print heap layout before and after each GC") \
2497 \
2498 product_rw(bool, PrintHeapAtGCExtended, false, \
2499 "Print extended information about the layout of the heap " \
2500 "when -XX:+PrintHeapAtGC is set") \
2501 \
2502 product(bool, PrintHeapAtSIGBREAK, true, \
2503 "Print heap layout in response to SIGBREAK") \
2504 \
2505 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2506 "Print a class histogram before any major stop-world GC") \
2507 \
2508 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2509 "Print a class histogram after any major stop-world GC") \
2510 \
2511 manageable(bool, PrintClassHistogram, false, \
2512 "Print a histogram of class instances") \
2513 \
2514 develop(bool, TraceWorkGang, false, \
2515 "Trace activities of work gangs") \
2516 \
2517 product(bool, TraceParallelOldGCTasks, false, \
2518 "Trace multithreaded GC activity") \
2519 \
2520 develop(bool, TraceBlockOffsetTable, false, \
2521 "Print BlockOffsetTable maps") \
2522 \
2523 develop(bool, TraceCardTableModRefBS, false, \
2524 "Print CardTableModRefBS maps") \
2525 \
2526 develop(bool, TraceGCTaskManager, false, \
2527 "Trace actions of the GC task manager") \
2528 \
2529 develop(bool, TraceGCTaskQueue, false, \
2530 "Trace actions of the GC task queues") \
2531 \
2532 diagnostic(bool, TraceGCTaskThread, false, \
2533 "Trace actions of the GC task threads") \
2534 \
2535 product(bool, PrintParallelOldGCPhaseTimes, false, \
2536 "Print the time taken by each phase in ParallelOldGC " \
2537 "(PrintGCDetails must also be enabled)") \
2538 \
2539 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2540 "Trace marking phase in ParallelOldGC") \
2541 \
2542 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2543 "Trace summary phase in ParallelOldGC") \
2544 \
2545 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2546 "Trace compaction phase in ParallelOldGC") \
2547 \
2548 develop(bool, TraceParallelOldGCDensePrefix, false, \
2549 "Trace dense prefix computation for ParallelOldGC") \
2550 \
2551 develop(bool, IgnoreLibthreadGPFault, false, \
2552 "Suppress workaround for libthread GP fault") \
2553 \
2554 product(bool, PrintJNIGCStalls, false, \
2555 "Print diagnostic message when GC is stalled " \
2556 "by JNI critical section") \
2557 \
2558 experimental(double, ObjectCountCutOffPercent, 0.5, \
2559 "The percentage of the used heap that the instances of a class " \
2560 "must occupy for the class to generate a trace event") \
2561 range(0.0, 100.0) \
2562 \
2563 /* GC log rotation setting */ \
2564 \
2565 product(bool, UseGCLogFileRotation, false, \
2566 "Rotate gclog files (for long running applications). It requires "\
2567 "-Xloggc:<filename>") \
2568 \
2569 product(uintx, NumberOfGCLogFiles, 0, \
2570 "Number of gclog files in rotation " \
2571 "(default: 0, no rotation)") \
2572 \
2573 product(size_t, GCLogFileSize, 8*K, \
2574 "GC log file size, requires UseGCLogFileRotation. " \
2575 "Set to 0 to only trigger rotation via jcmd") \
2576 \
2577 /* JVMTI heap profiling */ \
2578 \
2579 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2580 "Trace JVMTI object tagging calls") \
2581 \
2582 diagnostic(bool, VerifyBeforeIteration, false, \
2583 "Verify memory system before JVMTI iteration") \
2584 \
2585 /* compiler interface */ \
2586 \
2587 develop(bool, CIPrintCompilerName, false, \
2588 "when CIPrint is active, print the name of the active compiler") \
2589 \
2590 diagnostic(bool, CIPrintCompileQueue, false, \
2591 "display the contents of the compile queue whenever a " \
2592 "compilation is enqueued") \
2593 \
2594 develop(bool, CIPrintRequests, false, \
2595 "display every request for compilation") \
2596 \
2597 product(bool, CITime, false, \
2598 "collect timing information for compilation") \
2599 \
2600 develop(bool, CITimeVerbose, false, \
2601 "be more verbose in compilation timings") \
2602 \
2603 develop(bool, CITimeEach, false, \
2604 "display timing information after each successful compilation") \
2605 \
2606 develop(bool, CICountOSR, false, \
2607 "use a separate counter when assigning ids to osr compilations") \
2608 \
2609 develop(bool, CICompileNatives, true, \
2610 "compile native methods if supported by the compiler") \
2611 \
2612 develop_pd(bool, CICompileOSR, \
2613 "compile on stack replacement methods if supported by the " \
2614 "compiler") \
2615 \
2616 develop(bool, CIPrintMethodCodes, false, \
2617 "print method bytecodes of the compiled code") \
2618 \
2619 develop(bool, CIPrintTypeFlow, false, \
2620 "print the results of ciTypeFlow analysis") \
2621 \
2622 develop(bool, CITraceTypeFlow, false, \
2623 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2624 \
2625 develop(intx, OSROnlyBCI, -1, \
2626 "OSR only at this bci. Negative values mean exclude that bci") \
2627 \
2628 /* compiler */ \
2629 \
2630 /* notice: the max range value here is max_jint, not max_intx */ \
2631 /* because of overflow issue */ \
2632 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2633 "Number of compiler threads to run") \
2634 range(0, max_jint) \
2635 constraint(CICompilerCountConstraintFunc, AtParse) \
2636 \
2637 product(intx, CompilationPolicyChoice, 0, \
2638 "which compilation policy (0-3)") \
2639 range(0, 3) \
2640 \
2641 develop(bool, UseStackBanging, true, \
2642 "use stack banging for stack overflow checks (required for " \
2643 "proper StackOverflow handling; disable only to measure cost " \
2644 "of stackbanging)") \
2645 \
2646 develop(bool, UseStrictFP, true, \
2647 "use strict fp if modifier strictfp is set") \
2648 \
2649 develop(bool, GenerateSynchronizationCode, true, \
2650 "generate locking/unlocking code for synchronized methods and " \
2651 "monitors") \
2652 \
2653 develop(bool, GenerateCompilerNullChecks, true, \
2654 "Generate explicit null checks for loads/stores/calls") \
2655 \
2656 develop(bool, GenerateRangeChecks, true, \
2657 "Generate range checks for array accesses") \
2658 \
2659 develop_pd(bool, ImplicitNullChecks, \
2660 "Generate code for implicit null checks") \
2661 \
2662 product_pd(bool, TrapBasedNullChecks, \
2663 "Generate code for null checks that uses a cmp and trap " \
2664 "instruction raising SIGTRAP. This is only used if an access to" \
2665 "null (+offset) will not raise a SIGSEGV, i.e.," \
2666 "ImplicitNullChecks don't work (PPC64).") \
2667 \
2668 product(bool, PrintSafepointStatistics, false, \
2669 "Print statistics about safepoint synchronization") \
2670 \
2671 product(intx, PrintSafepointStatisticsCount, 300, \
2672 "Total number of safepoint statistics collected " \
2673 "before printing them out") \
2674 range(1, max_intx) \
2675 \
2676 product(intx, PrintSafepointStatisticsTimeout, -1, \
2677 "Print safepoint statistics only when safepoint takes " \
2678 "more than PrintSafepointSatisticsTimeout in millis") \
2679 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2680 NOT_LP64(range(-1, max_intx)) \
2681 \
2682 product(bool, TraceSafepointCleanupTime, false, \
2683 "Print the break down of clean up tasks performed during " \
2684 "safepoint") \
2685 \
2686 product(bool, Inline, true, \
2687 "Enable inlining") \
2688 \
2689 product(bool, ClipInlining, true, \
2690 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2691 \
2692 develop(bool, UseCHA, true, \
2693 "Enable CHA") \
2694 \
2695 product(bool, UseTypeProfile, true, \
2696 "Check interpreter profile for historically monomorphic calls") \
2697 \
2698 diagnostic(bool, PrintInlining, false, \
2699 "Print inlining optimizations") \
2700 \
2701 product(bool, UsePopCountInstruction, false, \
2702 "Use population count instruction") \
2703 \
2704 develop(bool, EagerInitialization, false, \
2705 "Eagerly initialize classes if possible") \
2706 \
2707 diagnostic(bool, LogTouchedMethods, false, \
2708 "Log methods which have been ever touched in runtime") \
2709 \
2710 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2711 "Print all methods that have been ever touched in runtime") \
2712 \
2713 develop(bool, TraceMethodReplacement, false, \
2714 "Print when methods are replaced do to recompilation") \
2715 \
2716 develop(bool, PrintMethodFlushing, false, \
2717 "Print the nmethods being flushed") \
2718 \
2719 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2720 "print statistics about method flushing") \
2721 \
2722 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2723 "Number of compiled code invocations after which " \
2724 "the method is considered as hot by the flusher") \
2725 range(1, max_jint) \
2726 \
2727 diagnostic(intx, MinPassesBeforeFlush, 10, \
2728 "Minimum number of sweeper passes before an nmethod " \
2729 "can be flushed") \
2730 range(0, max_intx) \
2731 \
2732 product(bool, UseCodeAging, true, \
2733 "Insert counter to detect warm methods") \
2734 \
2735 diagnostic(bool, StressCodeAging, false, \
2736 "Start with counters compiled in") \
2737 \
2738 develop(bool, UseRelocIndex, false, \
2739 "Use an index to speed random access to relocations") \
2740 \
2741 develop(bool, StressCodeBuffers, false, \
2742 "Exercise code buffer expansion and other rare state changes") \
2743 \
2744 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2745 "Generate extra debugging information for non-safepoints in " \
2746 "nmethods") \
2747 \
2748 product(bool, PrintVMOptions, false, \
2749 "Print flags that appeared on the command line") \
2750 \
2751 product(bool, IgnoreUnrecognizedVMOptions, false, \
2752 "Ignore unrecognized VM options") \
2753 \
2754 product(bool, PrintCommandLineFlags, false, \
2755 "Print flags specified on command line or set by ergonomics") \
2756 \
2757 product(bool, PrintFlagsInitial, false, \
2758 "Print all VM flags before argument processing and exit VM") \
2759 \
2760 product(bool, PrintFlagsFinal, false, \
2761 "Print all VM flags after argument and ergonomic processing") \
2762 \
2763 notproduct(bool, PrintFlagsWithComments, false, \
2764 "Print all VM flags with default values and descriptions and " \
2765 "exit") \
2766 \
2767 product(bool, PrintFlagsRanges, false, \
2768 "Print VM flags and their ranges and exit VM") \
2769 \
2770 diagnostic(bool, SerializeVMOutput, true, \
2771 "Use a mutex to serialize output to tty and LogFile") \
2772 \
2773 diagnostic(bool, DisplayVMOutput, true, \
2774 "Display all VM output on the tty, independently of LogVMOutput") \
2775 \
2776 diagnostic(bool, LogVMOutput, false, \
2777 "Save VM output to LogFile") \
2778 \
2779 diagnostic(ccstr, LogFile, NULL, \
2780 "If LogVMOutput or LogCompilation is on, save VM output to " \
2781 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2782 \
2783 product(ccstr, ErrorFile, NULL, \
2784 "If an error occurs, save the error data to this file " \
2785 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2786 \
2787 product(bool, DisplayVMOutputToStderr, false, \
2788 "If DisplayVMOutput is true, display all VM output to stderr") \
2789 \
2790 product(bool, DisplayVMOutputToStdout, false, \
2791 "If DisplayVMOutput is true, display all VM output to stdout") \
2792 \
2793 product(bool, UseHeavyMonitors, false, \
2794 "use heavyweight instead of lightweight Java monitors") \
2795 \
2796 product(bool, PrintStringTableStatistics, false, \
2797 "print statistics about the StringTable and SymbolTable") \
2798 \
2799 diagnostic(bool, VerifyStringTableAtExit, false, \
2800 "verify StringTable contents at exit") \
2801 \
2802 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2803 "print histogram of the symbol table") \
2804 \
2805 notproduct(bool, ExitVMOnVerifyError, false, \
2806 "standard exit from VM if bytecode verify error " \
2807 "(only in debug mode)") \
2808 \
2809 diagnostic(ccstr, AbortVMOnException, NULL, \
2810 "Call fatal if this exception is thrown. Example: " \
2811 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2812 \
2813 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2814 "Call fatal if the exception pointed by AbortVMOnException " \
2815 "has this message") \
2816 \
2817 develop(bool, DebugVtables, false, \
2818 "add debugging code to vtable dispatch") \
2819 \
2820 develop(bool, PrintVtables, false, \
2821 "print vtables when printing klass") \
2822 \
2823 notproduct(bool, PrintVtableStats, false, \
2824 "print vtables stats at end of run") \
2825 \
2826 develop(bool, TraceCreateZombies, false, \
2827 "trace creation of zombie nmethods") \
2828 \
2829 notproduct(bool, IgnoreLockingAssertions, false, \
2830 "disable locking assertions (for speed)") \
2831 \
2832 product(bool, RangeCheckElimination, true, \
2833 "Eliminate range checks") \
2834 \
2835 develop_pd(bool, UncommonNullCast, \
2836 "track occurrences of null in casts; adjust compiler tactics") \
2837 \
2838 develop(bool, TypeProfileCasts, true, \
2839 "treat casts like calls for purposes of type profiling") \
2840 \
2841 develop(bool, DelayCompilationDuringStartup, true, \
2842 "Delay invoking the compiler until main application class is " \
2843 "loaded") \
2844 \
2845 develop(bool, CompileTheWorld, false, \
2846 "Compile all methods in all classes in bootstrap class path " \
2847 "(stress test)") \
2848 \
2849 develop(bool, CompileTheWorldPreloadClasses, true, \
2850 "Preload all classes used by a class before start loading") \
2851 \
2852 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2853 "Force a safepoint every n compiles so sweeper can keep up") \
2854 \
2855 develop(bool, FillDelaySlots, true, \
2856 "Fill delay slots (on SPARC only)") \
2857 \
2858 develop(bool, TimeLivenessAnalysis, false, \
2859 "Time computation of bytecode liveness analysis") \
2860 \
2861 develop(bool, TraceLivenessGen, false, \
2862 "Trace the generation of liveness analysis information") \
2863 \
2864 notproduct(bool, TraceLivenessQuery, false, \
2865 "Trace queries of liveness analysis information") \
2866 \
2867 notproduct(bool, CollectIndexSetStatistics, false, \
2868 "Collect information about IndexSets") \
2869 \
2870 develop(bool, UseLoopSafepoints, true, \
2871 "Generate Safepoint nodes in every loop") \
2872 \
2873 develop(intx, FastAllocateSizeLimit, 128*K, \
2874 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2875 "Inline allocations larger than this in doublewords must go slow")\
2876 \
2877 product(bool, AggressiveOpts, false, \
2878 "Enable aggressive optimizations - see arguments.cpp") \
2879 \
2880 product_pd(uintx, TypeProfileLevel, \
2881 "=XYZ, with Z: Type profiling of arguments at call; " \
2882 "Y: Type profiling of return value at call; " \
2883 "X: Type profiling of parameters to methods; " \
2884 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2885 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2886 \
2887 product(intx, TypeProfileArgsLimit, 2, \
2888 "max number of call arguments to consider for type profiling") \
2889 range(0, 16) \
2890 \
2891 product(intx, TypeProfileParmsLimit, 2, \
2892 "max number of incoming parameters to consider for type profiling"\
2893 ", -1 for all") \
2894 range(-1, 64) \
2895 \
2896 /* statistics */ \
2897 develop(bool, CountCompiledCalls, false, \
2898 "Count method invocations") \
2899 \
2900 notproduct(bool, CountRuntimeCalls, false, \
2901 "Count VM runtime calls") \
2902 \
2903 develop(bool, CountJNICalls, false, \
2904 "Count jni method invocations") \
2905 \
2906 notproduct(bool, CountJVMCalls, false, \
2907 "Count jvm method invocations") \
2908 \
2909 notproduct(bool, CountRemovableExceptions, false, \
2910 "Count exceptions that could be replaced by branches due to " \
2911 "inlining") \
2912 \
2913 notproduct(bool, ICMissHistogram, false, \
2914 "Produce histogram of IC misses") \
2915 \
2916 /* interpreter */ \
2917 develop(bool, ClearInterpreterLocals, false, \
2918 "Always clear local variables of interpreter activations upon " \
2919 "entry") \
2920 \
2921 product_pd(bool, RewriteBytecodes, \
2922 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2923 \
2924 product_pd(bool, RewriteFrequentPairs, \
2925 "Rewrite frequently used bytecode pairs into a single bytecode") \
2926 \
2927 diagnostic(bool, PrintInterpreter, false, \
2928 "Print the generated interpreter code") \
2929 \
2930 product(bool, UseInterpreter, true, \
2931 "Use interpreter for non-compiled methods") \
2932 \
2933 develop(bool, UseFastSignatureHandlers, true, \
2934 "Use fast signature handlers for native calls") \
2935 \
2936 product(bool, UseLoopCounter, true, \
2937 "Increment invocation counter on backward branch") \
2938 \
2939 product_pd(bool, UseOnStackReplacement, \
2940 "Use on stack replacement, calls runtime if invoc. counter " \
2941 "overflows in loop") \
2942 \
2943 notproduct(bool, TraceOnStackReplacement, false, \
2944 "Trace on stack replacement") \
2945 \
2946 product_pd(bool, PreferInterpreterNativeStubs, \
2947 "Use always interpreter stubs for native methods invoked via " \
2948 "interpreter") \
2949 \
2950 develop(bool, CountBytecodes, false, \
2951 "Count number of bytecodes executed") \
2952 \
2953 develop(bool, PrintBytecodeHistogram, false, \
2954 "Print histogram of the executed bytecodes") \
2955 \
2956 develop(bool, PrintBytecodePairHistogram, false, \
2957 "Print histogram of the executed bytecode pairs") \
2958 \
2959 diagnostic(bool, PrintSignatureHandlers, false, \
2960 "Print code generated for native method signature handlers") \
2961 \
2962 develop(bool, VerifyOops, false, \
2963 "Do plausibility checks for oops") \
2964 \
2965 develop(bool, CheckUnhandledOops, false, \
2966 "Check for unhandled oops in VM code") \
2967 \
2968 develop(bool, VerifyJNIFields, trueInDebug, \
2969 "Verify jfieldIDs for instance fields") \
2970 \
2971 notproduct(bool, VerifyJNIEnvThread, false, \
2972 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2973 "from JNI") \
2974 \
2975 develop(bool, VerifyFPU, false, \
2976 "Verify FPU state (check for NaN's, etc.)") \
2977 \
2978 develop(bool, VerifyThread, false, \
2979 "Watch the thread register for corruption (SPARC only)") \
2980 \
2981 develop(bool, VerifyActivationFrameSize, false, \
2982 "Verify that activation frame didn't become smaller than its " \
2983 "minimal size") \
2984 \
2985 develop(bool, TraceFrequencyInlining, false, \
2986 "Trace frequency based inlining") \
2987 \
2988 develop_pd(bool, InlineIntrinsics, \
2989 "Inline intrinsics that can be statically resolved") \
2990 \
2991 product_pd(bool, ProfileInterpreter, \
2992 "Profile at the bytecode level during interpretation") \
2993 \
2994 develop(bool, TraceProfileInterpreter, false, \
2995 "Trace profiling at the bytecode level during interpretation. " \
2996 "This outputs the profiling information collected to improve " \
2997 "jit compilation.") \
2998 \
2999 develop_pd(bool, ProfileTraps, \
3000 "Profile deoptimization traps at the bytecode level") \
3001 \
3002 product(intx, ProfileMaturityPercentage, 20, \
3003 "number of method invocations/branches (expressed as % of " \
3004 "CompileThreshold) before using the method's profile") \
3005 range(0, 100) \
3006 \
3007 diagnostic(bool, PrintMethodData, false, \
3008 "Print the results of +ProfileInterpreter at end of run") \
3009 \
3010 develop(bool, VerifyDataPointer, trueInDebug, \
3011 "Verify the method data pointer during interpreter profiling") \
3012 \
3013 develop(bool, VerifyCompiledCode, false, \
3014 "Include miscellaneous runtime verifications in nmethod code; " \
3015 "default off because it disturbs nmethod size heuristics") \
3016 \
3017 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3018 "Manually make GC thread crash then dump java stack trace; " \
3019 "Test only") \
3020 \
3021 /* compilation */ \
3022 product(bool, UseCompiler, true, \
3023 "Use Just-In-Time compilation") \
3024 \
3025 develop(bool, TraceCompilationPolicy, false, \
3026 "Trace compilation policy") \
3027 \
3028 develop(bool, TimeCompilationPolicy, false, \
3029 "Time the compilation policy") \
3030 \
3031 product(bool, UseCounterDecay, true, \
3032 "Adjust recompilation counters") \
3033 \
3034 develop(intx, CounterHalfLifeTime, 30, \
3035 "Half-life time of invocation counters (in seconds)") \
3036 \
3037 develop(intx, CounterDecayMinIntervalLength, 500, \
3038 "The minimum interval (in milliseconds) between invocation of " \
3039 "CounterDecay") \
3040 \
3041 product(bool, AlwaysCompileLoopMethods, false, \
3042 "When using recompilation, never interpret methods " \
3043 "containing loops") \
3044 \
3045 product(bool, DontCompileHugeMethods, true, \
3046 "Do not compile methods > HugeMethodLimit") \
3047 \
3048 /* Bytecode escape analysis estimation. */ \
3049 product(bool, EstimateArgEscape, true, \
3050 "Analyze bytecodes to estimate escape state of arguments") \
3051 \
3052 product(intx, BCEATraceLevel, 0, \
3053 "How much tracing to do of bytecode escape analysis estimates " \
3054 "(0-3)") \
3055 range(0, 3) \
3056 \
3057 product(intx, MaxBCEAEstimateLevel, 5, \
3058 "Maximum number of nested calls that are analyzed by BC EA") \
3059 range(0, max_jint) \
3060 \
3061 product(intx, MaxBCEAEstimateSize, 150, \
3062 "Maximum bytecode size of a method to be analyzed by BC EA") \
3063 range(0, max_jint) \
3064 \
3065 product(intx, AllocatePrefetchStyle, 1, \
3066 "0 = no prefetch, " \
3067 "1 = prefetch instructions for each allocation, " \
3068 "2 = use TLAB watermark to gate allocation prefetch, " \
3069 "3 = use BIS instruction on Sparc for allocation prefetch") \
3070 range(0, 3) \
3071 \
3072 product(intx, AllocatePrefetchDistance, -1, \
3073 "Distance to prefetch ahead of allocation pointer. " \
3074 "-1: use system-specific value (automatically determined") \
3075 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
3076 \
3077 product(intx, AllocatePrefetchLines, 3, \
3078 "Number of lines to prefetch ahead of array allocation pointer") \
3079 range(1, max_jint / 2) \
3080 \
3081 product(intx, AllocateInstancePrefetchLines, 1, \
3082 "Number of lines to prefetch ahead of instance allocation " \
3083 "pointer") \
3084 range(1, max_jint / 2) \
3085 \
3086 product(intx, AllocatePrefetchStepSize, 16, \
3087 "Step size in bytes of sequential prefetch instructions") \
3088 range(1, max_jint) \
3089 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
3090 \
3091 product(intx, AllocatePrefetchInstr, 0, \
3092 "Prefetch instruction to prefetch ahead of allocation pointer") \
3093 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \
3094 \
3095 /* deoptimization */ \
3096 develop(bool, TraceDeoptimization, false, \
3097 "Trace deoptimization") \
3098 \
3099 develop(bool, PrintDeoptimizationDetails, false, \
3100 "Print more information about deoptimization") \
3101 \
3102 develop(bool, DebugDeoptimization, false, \
3103 "Tracing various information while debugging deoptimization") \
3104 \
3105 product(intx, SelfDestructTimer, 0, \
3106 "Will cause VM to terminate after a given time (in minutes) " \
3107 "(0 means off)") \
3108 range(0, max_intx) \
3109 \
3110 product(intx, MaxJavaStackTraceDepth, 1024, \
3111 "The maximum number of lines in the stack trace for Java " \
3112 "exceptions (0 means all)") \
3113 range(0, max_jint/2) \
3114 \
3115 /* notice: the max range value here is max_jint, not max_intx */ \
3116 /* because of overflow issue */ \
3117 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3118 "Guarantee a safepoint (at least) every so many milliseconds " \
3119 "(0 means none)")) \
3120 NOT_EMBEDDED(range(0, max_jint)) \
3121 \
3122 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3123 "Guarantee a safepoint (at least) every so many milliseconds " \
3124 "(0 means none)")) \
3125 EMBEDDED_ONLY(range(0, max_jint)) \
3126 \
3127 product(intx, SafepointTimeoutDelay, 10000, \
3128 "Delay in milliseconds for option SafepointTimeout") \
3129 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
3130 NOT_LP64(range(0, max_intx)) \
3131 \
3132 product(intx, NmethodSweepActivity, 10, \
3133 "Removes cold nmethods from code cache if > 0. Higher values " \
3134 "result in more aggressive sweeping") \
3135 range(0, 2000) \
3136 \
3137 notproduct(bool, LogSweeper, false, \
3138 "Keep a ring buffer of sweeper activity") \
3139 \
3140 notproduct(intx, SweeperLogEntries, 1024, \
3141 "Number of records in the ring buffer of sweeper activity") \
3142 \
3143 notproduct(intx, MemProfilingInterval, 500, \
3144 "Time between each invocation of the MemProfiler") \
3145 \
3146 develop(intx, MallocCatchPtr, -1, \
3147 "Hit breakpoint when mallocing/freeing this pointer") \
3148 \
3149 notproduct(ccstrlist, SuppressErrorAt, "", \
3150 "List of assertions (file:line) to muzzle") \
3151 \
3152 notproduct(size_t, HandleAllocationLimit, 1024, \
3153 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3154 "is used") \
3155 \
3156 develop(size_t, TotalHandleAllocationLimit, 1024, \
3157 "Threshold for total handle allocation when " \
3158 "+TraceHandleAllocation is used") \
3159 \
3160 develop(intx, StackPrintLimit, 100, \
3161 "number of stack frames to print in VM-level stack dump") \
3162 \
3163 notproduct(intx, MaxElementPrintSize, 256, \
3164 "maximum number of elements to print") \
3165 \
3166 notproduct(intx, MaxSubklassPrintSize, 4, \
3167 "maximum number of subklasses to print when printing klass") \
3168 \
3169 product(intx, MaxInlineLevel, 9, \
3170 "maximum number of nested calls that are inlined") \
3171 range(0, max_jint) \
3172 \
3173 product(intx, MaxRecursiveInlineLevel, 1, \
3174 "maximum number of nested recursive calls that are inlined") \
3175 range(0, max_jint) \
3176 \
3177 develop(intx, MaxForceInlineLevel, 100, \
3178 "maximum number of nested calls that are forced for inlining " \
3179 "(using CompileCommand or marked w/ @ForceInline)") \
3180 range(0, max_jint) \
3181 \
3182 product_pd(intx, InlineSmallCode, \
3183 "Only inline already compiled methods if their code size is " \
3184 "less than this") \
3185 range(0, max_jint) \
3186 \
3187 product(intx, MaxInlineSize, 35, \
3188 "The maximum bytecode size of a method to be inlined") \
3189 range(0, max_jint) \
3190 \
3191 product_pd(intx, FreqInlineSize, \
3192 "The maximum bytecode size of a frequent method to be inlined") \
3193 range(0, max_jint) \
3194 \
3195 product(intx, MaxTrivialSize, 6, \
3196 "The maximum bytecode size of a trivial method to be inlined") \
3197 range(0, max_jint) \
3198 \
3199 product(intx, MinInliningThreshold, 250, \
3200 "The minimum invocation count a method needs to have to be " \
3201 "inlined") \
3202 range(0, max_jint) \
3203 \
3204 develop(intx, MethodHistogramCutoff, 100, \
3205 "The cutoff value for method invocation histogram (+CountCalls)") \
3206 \
3207 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3208 "Number of interpreted methods to show in profile") \
3209 \
3210 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3211 "Number of compiled methods to show in profile") \
3212 \
3213 develop(intx, ProfilerNumberOfStubMethods, 25, \
3214 "Number of stub methods to show in profile") \
3215 \
3216 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3217 "Number of runtime stub nodes to show in profile") \
3218 \
3219 product(intx, ProfileIntervalsTicks, 100, \
3220 "Number of ticks between printing of interval profile " \
3221 "(+ProfileIntervals)") \
3222 range(0, max_intx) \
3223 \
3224 notproduct(intx, ScavengeALotInterval, 1, \
3225 "Interval between which scavenge will occur with +ScavengeALot") \
3226 \
3227 notproduct(intx, FullGCALotInterval, 1, \
3228 "Interval between which full gc will occur with +FullGCALot") \
3229 \
3230 notproduct(intx, FullGCALotStart, 0, \
3231 "For which invocation to start FullGCAlot") \
3232 \
3233 notproduct(intx, FullGCALotDummies, 32*K, \
3234 "Dummy object allocated with +FullGCALot, forcing all objects " \
3235 "to move") \
3236 \
3237 develop(intx, DontYieldALotInterval, 10, \
3238 "Interval between which yields will be dropped (milliseconds)") \
3239 \
3240 develop(intx, MinSleepInterval, 1, \
3241 "Minimum sleep() interval (milliseconds) when " \
3242 "ConvertSleepToYield is off (used for Solaris)") \
3243 \
3244 develop(intx, ProfilerPCTickThreshold, 15, \
3245 "Number of ticks in a PC buckets to be a hotspot") \
3246 \
3247 notproduct(intx, DeoptimizeALotInterval, 5, \
3248 "Number of exits until DeoptimizeALot kicks in") \
3249 \
3250 notproduct(intx, ZombieALotInterval, 5, \
3251 "Number of exits until ZombieALot kicks in") \
3252 \
3253 diagnostic(intx, MallocVerifyInterval, 0, \
3254 "If non-zero, verify C heap after every N calls to " \
3255 "malloc/realloc/free") \
3256 range(0, max_intx) \
3257 \
3258 diagnostic(intx, MallocVerifyStart, 0, \
3259 "If non-zero, start verifying C heap after Nth call to " \
3260 "malloc/realloc/free") \
3261 range(0, max_intx) \
3262 \
3263 diagnostic(uintx, MallocMaxTestWords, 0, \
3264 "If non-zero, maximum number of words that malloc/realloc can " \
3265 "allocate (for testing only)") \
3266 range(0, max_uintx) \
3267 \
3268 product(intx, TypeProfileWidth, 2, \
3269 "Number of receiver types to record in call/cast profile") \
3270 range(0, 8) \
3271 \
3272 experimental(intx, MethodProfileWidth, 0, \
3273 "Number of methods to record in call profile") \
3274 \
3275 develop(intx, BciProfileWidth, 2, \
3276 "Number of return bci's to record in ret profile") \
3277 \
3278 product(intx, PerMethodRecompilationCutoff, 400, \
3279 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3280 range(-1, max_intx) \
3281 \
3282 product(intx, PerBytecodeRecompilationCutoff, 200, \
3283 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3284 range(-1, max_intx) \
3285 \
3286 product(intx, PerMethodTrapLimit, 100, \
3287 "Limit on traps (of one kind) in a method (includes inlines)") \
3288 range(0, max_jint) \
3289 \
3290 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3291 "Limit on speculative traps (of one kind) in a method " \
3292 "(includes inlines)") \
3293 range(0, max_jint) \
3294 \
3295 product(intx, PerBytecodeTrapLimit, 4, \
3296 "Limit on traps (of one kind) at a particular BCI") \
3297 range(0, max_jint) \
3298 \
3299 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3300 "Extra method data trap entries for speculation") \
3301 \
3302 develop(intx, InlineFrequencyRatio, 20, \
3303 "Ratio of call site execution to caller method invocation") \
3304 range(0, max_jint) \
3305 \
3306 develop_pd(intx, InlineFrequencyCount, \
3307 "Count of call site execution necessary to trigger frequent " \
3308 "inlining") \
3309 range(0, max_jint) \
3310 \
3311 develop(intx, InlineThrowCount, 50, \
3312 "Force inlining of interpreted methods that throw this often") \
3313 range(0, max_jint) \
3314 \
3315 develop(intx, InlineThrowMaxSize, 200, \
3316 "Force inlining of throwing methods smaller than this") \
3317 range(0, max_jint) \
3318 \
3319 develop(intx, ProfilerNodeSize, 1024, \
3320 "Size in K to allocate for the Profile Nodes of each thread") \
3321 range(0, 1024) \
3322 \
3323 /* gc parameters */ \
3324 product(size_t, InitialHeapSize, 0, \
3325 "Initial heap size (in bytes); zero means use ergonomics") \
3326 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3327 \
3328 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3329 "Maximum heap size (in bytes)") \
3330 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3331 \
3332 product(size_t, OldSize, ScaleForWordSize(4*M), \
3333 "Initial tenured generation size (in bytes)") \
3334 \
3335 product(size_t, NewSize, ScaleForWordSize(1*M), \
3336 "Initial new generation size (in bytes)") \
3337 constraint(NewSizeConstraintFunc,AfterErgo) \
3338 \
3339 product(size_t, MaxNewSize, max_uintx, \
3340 "Maximum new generation size (in bytes), max_uintx means set " \
3341 "ergonomically") \
3342 \
3343 product(size_t, PretenureSizeThreshold, 0, \
3344 "Maximum size in bytes of objects allocated in DefNew " \
3345 "generation; zero means no maximum") \
3346 \
3347 product(size_t, MinTLABSize, 2*K, \
3348 "Minimum allowed TLAB size (in bytes)") \
3349 range(1, max_uintx) \
3350 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3351 \
3352 product(size_t, TLABSize, 0, \
3353 "Starting TLAB size (in bytes); zero means set ergonomically") \
3354 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3355 \
3356 product(size_t, YoungPLABSize, 4096, \
3357 "Size of young gen promotion LAB's (in HeapWords)") \
3358 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3359 \
3360 product(size_t, OldPLABSize, 1024, \
3361 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3362 "of blocks to attempt to claim when refilling CMS LAB's") \
3363 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3364 \
3365 product(uintx, TLABAllocationWeight, 35, \
3366 "Allocation averaging weight") \
3367 range(0, 100) \
3368 \
3369 /* Limit the lower bound of this flag to 1 as it is used */ \
3370 /* in a division expression. */ \
3371 product(uintx, TLABWasteTargetPercent, 1, \
3372 "Percentage of Eden that can be wasted") \
3373 range(1, 100) \
3374 \
3375 product(uintx, TLABRefillWasteFraction, 64, \
3376 "Maximum TLAB waste at a refill (internal fragmentation)") \
3377 range(1, max_uintx) \
3378 \
3379 product(uintx, TLABWasteIncrement, 4, \
3380 "Increment allowed waste at slow allocation") \
3381 \
3382 product(uintx, SurvivorRatio, 8, \
3383 "Ratio of eden/survivor space size") \
3384 range(1, max_uintx-2) \
3385 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3386 \
3387 product(uintx, NewRatio, 2, \
3388 "Ratio of old/new generation sizes") \
3389 range(0, max_uintx-1) \
3390 \
3391 product_pd(size_t, NewSizeThreadIncrease, \
3392 "Additional size added to desired new generation size per " \
3393 "non-daemon thread (in bytes)") \
3394 \
3395 product_pd(size_t, MetaspaceSize, \
3396 "Initial size of Metaspaces (in bytes)") \
3397 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3398 \
3399 product(size_t, MaxMetaspaceSize, max_uintx, \
3400 "Maximum size of Metaspaces (in bytes)") \
3401 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3402 \
3403 product(size_t, CompressedClassSpaceSize, 1*G, \
3404 "Maximum size of class area in Metaspace when compressed " \
3405 "class pointers are used") \
3406 range(1*M, 3*G) \
3407 \
3408 manageable(uintx, MinHeapFreeRatio, 40, \
3409 "The minimum percentage of heap free after GC to avoid expansion."\
3410 " For most GCs this applies to the old generation. In G1 and" \
3411 " ParallelGC it applies to the whole heap.") \
3412 range(0, 100) \
3413 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3414 \
3415 manageable(uintx, MaxHeapFreeRatio, 70, \
3416 "The maximum percentage of heap free after GC to avoid shrinking."\
3417 " For most GCs this applies to the old generation. In G1 and" \
3418 " ParallelGC it applies to the whole heap.") \
3419 range(0, 100) \
3420 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3421 \
3422 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3423 "Number of milliseconds per MB of free space in the heap") \
3424 range(0, max_intx) \
3425 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3426 \
3427 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3428 "The minimum change in heap space due to GC (in bytes)") \
3429 \
3430 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3431 "The minimum expansion of Metaspace (in bytes)") \
3432 \
3433 product(uintx, MaxMetaspaceFreeRatio, 70, \
3434 "The maximum percentage of Metaspace free after GC to avoid " \
3435 "shrinking") \
3436 range(0, 100) \
3437 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3438 \
3439 product(uintx, MinMetaspaceFreeRatio, 40, \
3440 "The minimum percentage of Metaspace free after GC to avoid " \
3441 "expansion") \
3442 range(0, 99) \
3443 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3444 \
3445 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3446 "The maximum expansion of Metaspace without full GC (in bytes)") \
3447 \
3448 product(uintx, QueuedAllocationWarningCount, 0, \
3449 "Number of times an allocation that queues behind a GC " \
3450 "will retry before printing a warning") \
3451 \
3452 diagnostic(uintx, VerifyGCStartAt, 0, \
3453 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3454 \
3455 diagnostic(intx, VerifyGCLevel, 0, \
3456 "Generation level at which to start +VerifyBefore/AfterGC") \
3457 range(0, 1) \
3458 \
3459 product(uintx, MaxTenuringThreshold, 15, \
3460 "Maximum value for tenuring threshold") \
3461 range(0, markOopDesc::max_age + 1) \
3462 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3463 \
3464 product(uintx, InitialTenuringThreshold, 7, \
3465 "Initial value for tenuring threshold") \
3466 range(0, markOopDesc::max_age + 1) \
3467 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3468 \
3469 product(uintx, TargetSurvivorRatio, 50, \
3470 "Desired percentage of survivor space used after scavenge") \
3471 range(0, 100) \
3472 \
3473 product(uintx, MarkSweepDeadRatio, 5, \
3474 "Percentage (0-100) of the old gen allowed as dead wood. " \
3475 "Serial mark sweep treats this as both the minimum and maximum " \
3476 "value. " \
3477 "CMS uses this value only if it falls back to mark sweep. " \
3478 "Par compact uses a variable scale based on the density of the " \
3479 "generation and treats this as the maximum value when the heap " \
3480 "is either completely full or completely empty. Par compact " \
3481 "also has a smaller default value; see arguments.cpp.") \
3482 range(0, 100) \
3483 \
3484 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3485 "How often should we fully compact the heap (ignoring the dead " \
3486 "space parameters)") \
3487 range(1, max_uintx) \
3488 \
3489 product(intx, PrintCMSStatistics, 0, \
3490 "Statistics for CMS") \
3491 \
3492 product(bool, PrintCMSInitiationStatistics, false, \
3493 "Statistics for initiating a CMS collection") \
3494 \
3495 product(intx, PrintFLSStatistics, 0, \
3496 "Statistics for CMS' FreeListSpace") \
3497 \
3498 product(intx, PrintFLSCensus, 0, \
3499 "Census for CMS' FreeListSpace") \
3500 \
3501 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3502 "Delay between expansion and allocation (in milliseconds)") \
3503 \
3504 develop(uintx, GCWorkerDelayMillis, 0, \
3505 "Delay in scheduling GC workers (in milliseconds)") \
3506 \
3507 product(intx, DeferThrSuspendLoopCount, 4000, \
3508 "(Unstable) Number of times to iterate in safepoint loop " \
3509 "before blocking VM threads ") \
3510 range(-1, max_jint-1) \
3511 \
3512 product(intx, DeferPollingPageLoopCount, -1, \
3513 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3514 "before changing safepoint polling page to RO ") \
3515 range(-1, max_jint-1) \
3516 \
3517 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3518 range(0, max_intx) \
3519 \
3520 product(bool, PSChunkLargeArrays, true, \
3521 "Process large arrays in chunks") \
3522 \
3523 product(uintx, GCDrainStackTargetSize, 64, \
3524 "Number of entries we will try to leave on the stack " \
3525 "during parallel gc") \
3526 \
3527 /* stack parameters */ \
3528 product_pd(intx, StackYellowPages, \
3529 "Number of yellow zone (recoverable overflows) pages") \
3530 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3531 \
3532 product_pd(intx, StackRedPages, \
3533 "Number of red zone (unrecoverable overflows) pages") \
3534 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3535 \
3536 /* greater stack shadow pages can't generate instruction to bang stack */ \
3537 product_pd(intx, StackShadowPages, \
3538 "Number of shadow zone (for overflow checking) pages " \
3539 "this should exceed the depth of the VM and native call stack") \
3540 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3541 \
3542 product_pd(intx, ThreadStackSize, \
3543 "Thread Stack Size (in Kbytes)") \
3544 range(0, max_intx-os::vm_page_size()) \
3545 \
3546 product_pd(intx, VMThreadStackSize, \
3547 "Non-Java Thread Stack Size (in Kbytes)") \
3548 range(0, max_intx/(1 * K)) \
3549 \
3550 product_pd(intx, CompilerThreadStackSize, \
3551 "Compiler Thread Stack Size (in Kbytes)") \
3552 range(0, max_intx) \
3553 \
3554 develop_pd(size_t, JVMInvokeMethodSlack, \
3555 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3556 \
3557 /* code cache parameters */ \
3558 /* ppc64/tiered compilation has large code-entry alignment. */ \
3559 develop(uintx, CodeCacheSegmentSize, \
3560 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \
3561 "Code cache segment size (in bytes) - smallest unit of " \
3562 "allocation") \
3563 range(1, 1024) \
3564 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3565 \
3566 develop_pd(intx, CodeEntryAlignment, \
3567 "Code entry alignment for generated code (in bytes)") \
3568 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3569 \
3570 product_pd(intx, OptoLoopAlignment, \
3571 "Align inner loops to zero relative to this modulus") \
3572 range(1, 16) \
3573 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3574 \
3575 product_pd(uintx, InitialCodeCacheSize, \
3576 "Initial code cache size (in bytes)") \
3577 range(0, max_uintx) \
3578 \
3579 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3580 "Minimum code cache size (in bytes) required to start VM.") \
3581 range(0, max_uintx) \
3582 \
3583 product(bool, SegmentedCodeCache, false, \
3584 "Use a segmented code cache") \
3585 \
3586 product_pd(uintx, ReservedCodeCacheSize, \
3587 "Reserved code cache size (in bytes) - maximum code cache size") \
3588 range(0, max_uintx) \
3589 \
3590 product_pd(uintx, NonProfiledCodeHeapSize, \
3591 "Size of code heap with non-profiled methods (in bytes)") \
3592 range(0, max_uintx) \
3593 \
3594 product_pd(uintx, ProfiledCodeHeapSize, \
3595 "Size of code heap with profiled methods (in bytes)") \
3596 range(0, max_uintx) \
3597 \
3598 product_pd(uintx, NonNMethodCodeHeapSize, \
3599 "Size of code heap with non-nmethods (in bytes)") \
3600 range(0, max_uintx) \
3601 \
3602 product_pd(uintx, CodeCacheExpansionSize, \
3603 "Code cache expansion size (in bytes)") \
3604 range(0, max_uintx) \
3605 \
3606 develop_pd(uintx, CodeCacheMinBlockLength, \
3607 "Minimum number of segments in a code cache block") \
3608 range(1, 100) \
3609 \
3610 notproduct(bool, ExitOnFullCodeCache, false, \
3611 "Exit the VM if we fill the code cache") \
3612 \
3613 product(bool, UseCodeCacheFlushing, true, \
3614 "Remove cold/old nmethods from the code cache") \
3615 \
3616 product(uintx, StartAggressiveSweepingAt, 10, \
3617 "Start aggressive sweeping if X[%] of the code cache is free." \
3618 "Segmented code cache: X[%] of the non-profiled heap." \
3619 "Non-segmented code cache: X[%] of the total code cache") \
3620 range(0, 100) \
3621 \
3622 /* interpreter debugging */ \
3623 develop(intx, BinarySwitchThreshold, 5, \
3624 "Minimal number of lookupswitch entries for rewriting to binary " \
3625 "switch") \
3626 \
3627 develop(intx, StopInterpreterAt, 0, \
3628 "Stop interpreter execution at specified bytecode number") \
3629 \
3630 develop(intx, TraceBytecodesAt, 0, \
3631 "Trace bytecodes starting with specified bytecode number") \
3632 \
3633 /* compiler interface */ \
3634 develop(intx, CIStart, 0, \
3635 "The id of the first compilation to permit") \
3636 \
3637 develop(intx, CIStop, max_jint, \
3638 "The id of the last compilation to permit") \
3639 \
3640 develop(intx, CIStartOSR, 0, \
3641 "The id of the first osr compilation to permit " \
3642 "(CICountOSR must be on)") \
3643 \
3644 develop(intx, CIStopOSR, max_jint, \
3645 "The id of the last osr compilation to permit " \
3646 "(CICountOSR must be on)") \
3647 \
3648 develop(intx, CIBreakAtOSR, -1, \
3649 "The id of osr compilation to break at") \
3650 \
3651 develop(intx, CIBreakAt, -1, \
3652 "The id of compilation to break at") \
3653 \
3654 product(ccstrlist, CompileOnly, "", \
3655 "List of methods (pkg/class.name) to restrict compilation to") \
3656 \
3657 product(ccstr, CompileCommandFile, NULL, \
3658 "Read compiler commands from this file [.hotspot_compiler]") \
3659 \
3660 product(ccstrlist, CompileCommand, "", \
3661 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3662 \
3663 develop(bool, ReplayCompiles, false, \
3664 "Enable replay of compilations from ReplayDataFile") \
3665 \
3666 product(ccstr, ReplayDataFile, NULL, \
3667 "File containing compilation replay information" \
3668 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3669 \
3670 product(ccstr, InlineDataFile, NULL, \
3671 "File containing inlining replay information" \
3672 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3673 \
3674 develop(intx, ReplaySuppressInitializers, 2, \
3675 "Control handling of class initialization during replay: " \
3676 "0 - don't do anything special; " \
3677 "1 - treat all class initializers as empty; " \
3678 "2 - treat class initializers for application classes as empty; " \
3679 "3 - allow all class initializers to run during bootstrap but " \
3680 " pretend they are empty after starting replay") \
3681 range(0, 3) \
3682 \
3683 develop(bool, ReplayIgnoreInitErrors, false, \
3684 "Ignore exceptions thrown during initialization for replay") \
3685 \
3686 product(bool, DumpReplayDataOnError, true, \
3687 "Record replay data for crashing compiler threads") \
3688 \
3689 product(bool, CICompilerCountPerCPU, false, \
3690 "1 compiler thread for log(N CPUs)") \
3691 \
3692 develop(intx, CIFireOOMAt, -1, \
3693 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3694 "(non-negative value throws OOM after this many CI accesses " \
3695 "in each compile)") \
3696 notproduct(intx, CICrashAt, -1, \
3697 "id of compilation to trigger assert in compiler thread for " \
3698 "the purpose of testing, e.g. generation of replay data") \
3699 notproduct(bool, CIObjectFactoryVerify, false, \
3700 "enable potentially expensive verification in ciObjectFactory") \
3701 \
3702 /* Priorities */ \
3703 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3704 \
3705 product(intx, ThreadPriorityPolicy, 0, \
3706 "0 : Normal. "\
3707 " VM chooses priorities that are appropriate for normal "\
3708 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3709 " to normal native priority. Java priorities below " \
3710 " NORM_PRIORITY map to lower native priority values. On "\
3711 " Windows applications are allowed to use higher native "\
3712 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3713 " not use the highest possible native priority, "\
3714 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3715 " system threads. On Linux thread priorities are ignored "\
3716 " because the OS does not support static priority in "\
3717 " SCHED_OTHER scheduling class which is the only choice for "\
3718 " non-root, non-realtime applications. "\
3719 "1 : Aggressive. "\
3720 " Java thread priorities map over to the entire range of "\
3721 " native thread priorities. Higher Java thread priorities map "\
3722 " to higher native thread priorities. This policy should be "\
3723 " used with care, as sometimes it can cause performance "\
3724 " degradation in the application and/or the entire system. On "\
3725 " Linux this policy requires root privilege.") \
3726 range(0, 1) \
3727 \
3728 product(bool, ThreadPriorityVerbose, false, \
3729 "Print priority changes") \
3730 \
3731 product(intx, CompilerThreadPriority, -1, \
3732 "The native priority at which compiler threads should run " \
3733 "(-1 means no change)") \
3734 range(min_jint, max_jint) \
3735 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3736 \
3737 product(intx, VMThreadPriority, -1, \
3738 "The native priority at which the VM thread should run " \
3739 "(-1 means no change)") \
3740 range(-1, 127) \
3741 \
3742 product(bool, CompilerThreadHintNoPreempt, true, \
3743 "(Solaris only) Give compiler threads an extra quanta") \
3744 \
3745 product(bool, VMThreadHintNoPreempt, false, \
3746 "(Solaris only) Give VM thread an extra quanta") \
3747 \
3748 product(intx, JavaPriority1_To_OSPriority, -1, \
3749 "Map Java priorities to OS priorities") \
3750 range(-1, 127) \
3751 \
3752 product(intx, JavaPriority2_To_OSPriority, -1, \
3753 "Map Java priorities to OS priorities") \
3754 range(-1, 127) \
3755 \
3756 product(intx, JavaPriority3_To_OSPriority, -1, \
3757 "Map Java priorities to OS priorities") \
3758 range(-1, 127) \
3759 \
3760 product(intx, JavaPriority4_To_OSPriority, -1, \
3761 "Map Java priorities to OS priorities") \
3762 range(-1, 127) \
3763 \
3764 product(intx, JavaPriority5_To_OSPriority, -1, \
3765 "Map Java priorities to OS priorities") \
3766 range(-1, 127) \
3767 \
3768 product(intx, JavaPriority6_To_OSPriority, -1, \
3769 "Map Java priorities to OS priorities") \
3770 range(-1, 127) \
3771 \
3772 product(intx, JavaPriority7_To_OSPriority, -1, \
3773 "Map Java priorities to OS priorities") \
3774 range(-1, 127) \
3775 \
3776 product(intx, JavaPriority8_To_OSPriority, -1, \
3777 "Map Java priorities to OS priorities") \
3778 range(-1, 127) \
3779 \
3780 product(intx, JavaPriority9_To_OSPriority, -1, \
3781 "Map Java priorities to OS priorities") \
3782 range(-1, 127) \
3783 \
3784 product(intx, JavaPriority10_To_OSPriority,-1, \
3785 "Map Java priorities to OS priorities") \
3786 range(-1, 127) \
3787 \
3788 experimental(bool, UseCriticalJavaThreadPriority, false, \
3789 "Java thread priority 10 maps to critical scheduling priority") \
3790 \
3791 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3792 "Compiler thread(s) run at critical scheduling priority") \
3793 \
3794 experimental(bool, UseCriticalCMSThreadPriority, false, \
3795 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3796 \
3797 /* compiler debugging */ \
3798 notproduct(intx, CompileTheWorldStartAt, 1, \
3799 "First class to consider when using +CompileTheWorld") \
3800 \
3801 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3802 "Last class to consider when using +CompileTheWorld") \
3803 \
3804 develop(intx, NewCodeParameter, 0, \
3805 "Testing Only: Create a dedicated integer parameter before " \
3806 "putback") \
3807 \
3808 /* new oopmap storage allocation */ \
3809 develop(intx, MinOopMapAllocation, 8, \
3810 "Minimum number of OopMap entries in an OopMapSet") \
3811 \
3812 /* Background Compilation */ \
3813 develop(intx, LongCompileThreshold, 50, \
3814 "Used with +TraceLongCompiles") \
3815 \
3816 /* recompilation */ \
3817 product_pd(intx, CompileThreshold, \
3818 "number of interpreted method invocations before (re-)compiling") \
3819 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3820 \
3821 product(double, CompileThresholdScaling, 1.0, \
3822 "Factor to control when first compilation happens " \
3823 "(both with and without tiered compilation): " \
3824 "values greater than 1.0 delay counter overflow, " \
3825 "values between 0 and 1.0 rush counter overflow, " \
3826 "value of 1.0 leaves compilation thresholds unchanged " \
3827 "value of 0.0 is equivalent to -Xint. " \
3828 "" \
3829 "Flag can be set as per-method option. " \
3830 "If a value is specified for a method, compilation thresholds " \
3831 "for that method are scaled by both the value of the global flag "\
3832 "and the value of the per-method flag.") \
3833 range(0.0, DBL_MAX) \
3834 \
3835 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3836 "Interpreter (tier 0) invocation notification frequency") \
3837 range(0, 30) \
3838 \
3839 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3840 "C1 without MDO (tier 2) invocation notification frequency") \
3841 range(0, 30) \
3842 \
3843 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3844 "C1 with MDO profiling (tier 3) invocation notification " \
3845 "frequency") \
3846 range(0, 30) \
3847 \
3848 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3849 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3850 range(0, 30) \
3851 \
3852 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3853 "Interpreter (tier 0) invocation notification frequency") \
3854 range(0, 30) \
3855 \
3856 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3857 "C1 without MDO (tier 2) invocation notification frequency") \
3858 range(0, 30) \
3859 \
3860 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3861 "C1 with MDO profiling (tier 3) invocation notification " \
3862 "frequency") \
3863 range(0, 30) \
3864 \
3865 product(intx, Tier2CompileThreshold, 0, \
3866 "threshold at which tier 2 compilation is invoked") \
3867 range(0, max_jint) \
3868 \
3869 product(intx, Tier2BackEdgeThreshold, 0, \
3870 "Back edge threshold at which tier 2 compilation is invoked") \
3871 range(0, max_jint) \
3872 \
3873 product(intx, Tier3InvocationThreshold, 200, \
3874 "Compile if number of method invocations crosses this " \
3875 "threshold") \
3876 range(0, max_jint) \
3877 \
3878 product(intx, Tier3MinInvocationThreshold, 100, \
3879 "Minimum invocation to compile at tier 3") \
3880 range(0, max_jint) \
3881 \
3882 product(intx, Tier3CompileThreshold, 2000, \
3883 "Threshold at which tier 3 compilation is invoked (invocation " \
3884 "minimum must be satisfied)") \
3885 range(0, max_jint) \
3886 \
3887 product(intx, Tier3BackEdgeThreshold, 60000, \
3888 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3889 range(0, max_jint) \
3890 \
3891 product(intx, Tier4InvocationThreshold, 5000, \
3892 "Compile if number of method invocations crosses this " \
3893 "threshold") \
3894 range(0, max_jint) \
3895 \
3896 product(intx, Tier4MinInvocationThreshold, 600, \
3897 "Minimum invocation to compile at tier 4") \
3898 range(0, max_jint) \
3899 \
3900 product(intx, Tier4CompileThreshold, 15000, \
3901 "Threshold at which tier 4 compilation is invoked (invocation " \
3902 "minimum must be satisfied") \
3903 range(0, max_jint) \
3904 \
3905 product(intx, Tier4BackEdgeThreshold, 40000, \
3906 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3907 range(0, max_jint) \
3908 \
3909 product(intx, Tier3DelayOn, 5, \
3910 "If C2 queue size grows over this amount per compiler thread " \
3911 "stop compiling at tier 3 and start compiling at tier 2") \
3912 range(0, max_jint) \
3913 \
3914 product(intx, Tier3DelayOff, 2, \
3915 "If C2 queue size is less than this amount per compiler thread " \
3916 "allow methods compiled at tier 2 transition to tier 3") \
3917 range(0, max_jint) \
3918 \
3919 product(intx, Tier3LoadFeedback, 5, \
3920 "Tier 3 thresholds will increase twofold when C1 queue size " \
3921 "reaches this amount per compiler thread") \
3922 range(0, max_jint) \
3923 \
3924 product(intx, Tier4LoadFeedback, 3, \
3925 "Tier 4 thresholds will increase twofold when C2 queue size " \
3926 "reaches this amount per compiler thread") \
3927 range(0, max_jint) \
3928 \
3929 product(intx, TieredCompileTaskTimeout, 50, \
3930 "Kill compile task if method was not used within " \
3931 "given timeout in milliseconds") \
3932 range(0, max_intx) \
3933 \
3934 product(intx, TieredStopAtLevel, 4, \
3935 "Stop at given compilation level") \
3936 range(0, 4) \
3937 \
3938 product(intx, Tier0ProfilingStartPercentage, 200, \
3939 "Start profiling in interpreter if the counters exceed tier 3 " \
3940 "thresholds by the specified percentage") \
3941 range(0, max_jint) \
3942 \
3943 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3944 "Increase the compile threshold for C1 compilation if the code " \
3945 "cache is filled by the specified percentage") \
3946 range(0, 99) \
3947 \
3948 product(intx, TieredRateUpdateMinTime, 1, \
3949 "Minimum rate sampling interval (in milliseconds)") \
3950 range(0, max_intx) \
3951 \
3952 product(intx, TieredRateUpdateMaxTime, 25, \
3953 "Maximum rate sampling interval (in milliseconds)") \
3954 range(0, max_intx) \
3955 \
3956 product_pd(bool, TieredCompilation, \
3957 "Enable tiered compilation") \
3958 \
3959 product(bool, PrintTieredEvents, false, \
3960 "Print tiered events notifications") \
3961 \
3962 product_pd(intx, OnStackReplacePercentage, \
3963 "NON_TIERED number of method invocations/branches (expressed as " \
3964 "% of CompileThreshold) before (re-)compiling OSR code") \
3965 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3966 \
3967 product(intx, InterpreterProfilePercentage, 33, \
3968 "NON_TIERED number of method invocations/branches (expressed as " \
3969 "% of CompileThreshold) before profiling in the interpreter") \
3970 range(0, 100) \
3971 \
3972 develop(intx, MaxRecompilationSearchLength, 10, \
3973 "The maximum number of frames to inspect when searching for " \
3974 "recompilee") \
3975 \
3976 develop(intx, MaxInterpretedSearchLength, 3, \
3977 "The maximum number of interpreted frames to skip when searching "\
3978 "for recompilee") \
3979 \
3980 develop(intx, DesiredMethodLimit, 8000, \
3981 "The desired maximum method size (in bytecodes) after inlining") \
3982 \
3983 develop(intx, HugeMethodLimit, 8000, \
3984 "Don't compile methods larger than this if " \
3985 "+DontCompileHugeMethods") \
3986 \
3987 /* New JDK 1.4 reflection implementation */ \
3988 \
3989 develop(intx, FastSuperclassLimit, 8, \
3990 "Depth of hardwired instanceof accelerator array") \
3991 \
3992 /* Properties for Java libraries */ \
3993 \
3994 product(size_t, MaxDirectMemorySize, 0, \
3995 "Maximum total size of NIO direct-buffer allocations") \
3996 range(0, (size_t)SIZE_MAX) \
3997 \
3998 /* Flags used for temporary code during development */ \
3999 \
4000 diagnostic(bool, UseNewCode, false, \
4001 "Testing Only: Use the new version while testing") \
4002 \
4003 diagnostic(bool, UseNewCode2, false, \
4004 "Testing Only: Use the new version while testing") \
4005 \
4006 diagnostic(bool, UseNewCode3, false, \
4007 "Testing Only: Use the new version while testing") \
4008 \
4009 /* flags for performance data collection */ \
4010 \
4011 product(bool, UsePerfData, falseInEmbedded, \
4012 "Flag to disable jvmstat instrumentation for performance testing "\
4013 "and problem isolation purposes") \
4014 \
4015 product(bool, PerfDataSaveToFile, false, \
4016 "Save PerfData memory to hsperfdata_<pid> file on exit") \
4017 \
4018 product(ccstr, PerfDataSaveFile, NULL, \
4019 "Save PerfData memory to the specified absolute pathname. " \
4020 "The string %p in the file name (if present) " \
4021 "will be replaced by pid") \
4022 \
4023 product(intx, PerfDataSamplingInterval, 50, \
4024 "Data sampling interval (in milliseconds)") \
4025 range(PeriodicTask::min_interval, max_jint) \
4026 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
4027 \
4028 develop(bool, PerfTraceDataCreation, false, \
4029 "Trace creation of Performance Data Entries") \
4030 \
4031 develop(bool, PerfTraceMemOps, false, \
4032 "Trace PerfMemory create/attach/detach calls") \
4033 \
4034 product(bool, PerfDisableSharedMem, false, \
4035 "Store performance data in standard memory") \
4036 \
4037 product(intx, PerfDataMemorySize, 64*K, \
4038 "Size of performance data memory region. Will be rounded " \
4039 "up to a multiple of the native os page size.") \
4040 range(128, 32*64*K) \
4041 \
4042 product(intx, PerfMaxStringConstLength, 1024, \
4043 "Maximum PerfStringConstant string length before truncation") \
4044 range(32, 32*K) \
4045 \
4046 product(bool, PerfAllowAtExitRegistration, false, \
4047 "Allow registration of atexit() methods") \
4048 \
4049 product(bool, PerfBypassFileSystemCheck, false, \
4050 "Bypass Win32 file system criteria checks (Windows Only)") \
4051 \
4052 product(intx, UnguardOnExecutionViolation, 0, \
4053 "Unguard page and retry on no-execute fault (Win32 only) " \
4054 "0=off, 1=conservative, 2=aggressive") \
4055 range(0, 2) \
4056 \
4057 /* Serviceability Support */ \
4058 \
4059 product(bool, ManagementServer, false, \
4060 "Create JMX Management Server") \
4061 \
4062 product(bool, DisableAttachMechanism, false, \
4063 "Disable mechanism that allows tools to attach to this VM") \
4064 \
4065 product(bool, StartAttachListener, false, \
4066 "Always start Attach Listener at VM startup") \
4067 \
4068 manageable(bool, PrintConcurrentLocks, false, \
4069 "Print java.util.concurrent locks in thread dump") \
4070 \
4071 product(bool, TransmitErrorReport, false, \
4072 "Enable error report transmission on erroneous termination") \
4073 \
4074 product(ccstr, ErrorReportServer, NULL, \
4075 "Override built-in error report server address") \
4076 \
4077 /* Shared spaces */ \
4078 \
4079 product(bool, UseSharedSpaces, true, \
4080 "Use shared spaces for metadata") \
4081 \
4082 product(bool, VerifySharedSpaces, false, \
4083 "Verify shared spaces (false for default archive, true for " \
4084 "archive specified by -XX:SharedArchiveFile)") \
4085 \
4086 product(bool, RequireSharedSpaces, false, \
4087 "Require shared spaces for metadata") \
4088 \
4089 product(bool, DumpSharedSpaces, false, \
4090 "Special mode: JVM reads a class list, loads classes, builds " \
4091 "shared spaces, and dumps the shared spaces to a file to be " \
4092 "used in future JVM runs") \
4093 \
4094 product(bool, PrintSharedSpaces, false, \
4095 "Print usage of shared spaces") \
4096 \
4097 product(bool, PrintSharedArchiveAndExit, false, \
4098 "Print shared archive file contents") \
4099 \
4100 product(bool, PrintSharedDictionary, false, \
4101 "If PrintSharedArchiveAndExit is true, also print the shared " \
4102 "dictionary") \
4103 \
4104 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4105 "Size of read-write space for metadata (in bytes)") \
4106 \
4107 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
4108 "Size of read-only space for metadata (in bytes)") \
4109 \
4110 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
4111 "Size of the shared miscellaneous data area (in bytes)") \
4112 \
4113 product(uintx, SharedMiscCodeSize, 120*K, \
4114 "Size of the shared miscellaneous code area (in bytes)") \
4115 \
4116 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
4117 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
4118 "Address to allocate shared memory region for class data") \
4119 \
4120 product(uintx, SharedSymbolTableBucketSize, 4, \
4121 "Average number of symbols per bucket in shared table") \
4122 range(2, 246) \
4123 \
4124 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
4125 "Do not quit -Xshare:dump even if we encounter unverifiable " \
4126 "classes. Just exclude them from the shared dictionary.") \
4127 \
4128 diagnostic(bool, PrintMethodHandleStubs, false, \
4129 "Print generated stub code for method handles") \
4130 \
4131 develop(bool, TraceMethodHandles, false, \
4132 "trace internal method handle operations") \
4133 \
4134 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
4135 "perform extra checks when constructing method handles") \
4136 \
4137 diagnostic(bool, ShowHiddenFrames, false, \
4138 "show method handle implementation frames (usually hidden)") \
4139 \
4140 experimental(bool, TrustFinalNonStaticFields, false, \
4141 "trust final non-static declarations for constant folding") \
4142 \
4143 diagnostic(bool, FoldStableValues, true, \
4144 "Optimize loads from stable fields (marked w/ @Stable)") \
4145 \
4146 develop(bool, TraceInvokeDynamic, false, \
4147 "trace internal invoke dynamic operations") \
4148 \
4149 diagnostic(bool, PauseAtStartup, false, \
4150 "Causes the VM to pause at startup time and wait for the pause " \
4151 "file to be removed (default: ./vm.paused.<pid>)") \
4152 \
4153 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4154 "The file to create and for whose removal to await when pausing " \
4155 "at startup. (default: ./vm.paused.<pid>)") \
4156 \
4157 diagnostic(bool, PauseAtExit, false, \
4158 "Pause and wait for keypress on exit if a debugger is attached") \
4159 \
4160 product(bool, ExtendedDTraceProbes, false, \
4161 "Enable performance-impacting dtrace probes") \
4162 \
4163 product(bool, DTraceMethodProbes, false, \
4164 "Enable dtrace probes for method-entry and method-exit") \
4165 \
4166 product(bool, DTraceAllocProbes, false, \
4167 "Enable dtrace probes for object allocation") \
4168 \
4169 product(bool, DTraceMonitorProbes, false, \
4170 "Enable dtrace probes for monitor events") \
4171 \
4172 product(bool, RelaxAccessControlCheck, false, \
4173 "Relax the access control checks in the verifier") \
4174 \
4175 product(uintx, StringTableSize, defaultStringTableSize, \
4176 "Number of buckets in the interned String table") \
4177 range(minimumStringTableSize, 111*defaultStringTableSize) \
4178 \
4179 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4180 "Number of buckets in the JVM internal Symbol table") \
4181 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4182 \
4183 product(bool, UseStringDeduplication, false, \
4184 "Use string deduplication") \
4185 \
4186 product(bool, PrintStringDeduplicationStatistics, false, \
4187 "Print string deduplication statistics") \
4188 \
4189 product(uintx, StringDeduplicationAgeThreshold, 3, \
4190 "A string must reach this age (or be promoted to an old region) " \
4191 "to be considered for deduplication") \
4192 range(1, markOopDesc::max_age) \
4193 \
4194 diagnostic(bool, StringDeduplicationResizeALot, false, \
4195 "Force table resize every time the table is scanned") \
4196 \
4197 diagnostic(bool, StringDeduplicationRehashALot, false, \
4198 "Force table rehash every time the table is scanned") \
4199 \
4200 develop(bool, TraceDefaultMethods, false, \
4201 "Trace the default method processing steps") \
4202 \
4203 diagnostic(bool, WhiteBoxAPI, false, \
4204 "Enable internal testing APIs") \
4205 \
4206 product(bool, PrintGCCause, true, \
4207 "Include GC cause in GC logging") \
4208 \
4209 experimental(intx, SurvivorAlignmentInBytes, 0, \
4210 "Default survivor space alignment in bytes") \
4211 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4212 \
4213 product(bool , AllowNonVirtualCalls, false, \
4214 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4215 \
4216 product(ccstr, DumpLoadedClassList, NULL, \
4217 "Dump the names all loaded classes, that could be stored into " \
4218 "the CDS archive, in the specified file") \
4219 \
4220 product(ccstr, SharedClassListFile, NULL, \
4221 "Override the default CDS class list") \
4222 \
4223 diagnostic(ccstr, SharedArchiveFile, NULL, \
4224 "Override the default location of the CDS archive file") \
4225 \
4226 product(ccstr, ExtraSharedClassListFile, NULL, \
4227 "Extra classlist for building the CDS archive file") \
4228 \
4229 experimental(size_t, ArrayAllocatorMallocLimit, \
4230 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4231 "Allocation less than this value will be allocated " \
4232 "using malloc. Larger allocations will use mmap.") \
4233 \
4234 experimental(bool, AlwaysAtomicAccesses, false, \
4235 "Accesses to all variables should always be atomic") \
4236 \
4237 product(bool, EnableTracing, false, \
4238 "Enable event-based tracing") \
4239 \
4240 product(bool, UseLockedTracing, false, \
4241 "Use locked-tracing when doing event-based tracing") \
4242 \
4243 diagnostic(bool, UseUnalignedAccesses, false, \
4244 "Use unaligned memory accesses in Unsafe") \
4245 \
4246 product_pd(bool, PreserveFramePointer, \
4247 "Use the FP register for holding the frame pointer " \
4248 "and not as a general purpose register.") \
4249 \
4250 diagnostic(bool, CheckIntrinsics, true, \
4251 "When a class C is loaded, check that " \
4252 "(1) all intrinsics defined by the VM for class C are present "\
4253 "in the loaded class file and are marked with the " \
4254 "@HotSpotIntrinsicCandidate annotation, that " \
4255 "(2) there is an intrinsic registered for all loaded methods " \
4256 "that are annotated with the @HotSpotIntrinsicCandidate " \
4257 "annotation, and that " \
4258 "(3) no orphan methods exist for class C (i.e., methods for " \
4259 "which the VM declares an intrinsic but that are not declared "\
4260 "in the loaded class C. " \
4261 "Check (3) is available only in debug builds.")
4262
4263 /*
4264 * Macros for factoring of globals
4265 */
4266
4267 // Interface macros
4268 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4269 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4270 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4271 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4272 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4273 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4274 #ifdef PRODUCT
4275 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4276 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4277 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4278 #else
4279 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4280 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4281 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4282 #endif // PRODUCT
4283 // Special LP64 flags, product only needed for now.
4284 #ifdef _LP64
4285 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4286 #else
4287 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4288 #endif // _LP64
4289
4290 // Implementation macros
4291 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4292 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4293 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4294 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4295 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4296 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4297 #ifdef PRODUCT
4298 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4299 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4300 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4301 #else
4302 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4303 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4304 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4305 #endif // PRODUCT
4306 #ifdef _LP64
4307 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4308 #else
4309 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4310 #endif // _LP64
4311
4312 // Only materialize src code for range checking when required, ignore otherwise
4313 #define IGNORE_RANGE(a, b)
4314 // Only materialize src code for contraint checking when required, ignore otherwise
4315 #define IGNORE_CONSTRAINT(func,type)
4316
4317 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4318 DECLARE_PD_DEVELOPER_FLAG, \
4319 DECLARE_PRODUCT_FLAG, \
4320 DECLARE_PD_PRODUCT_FLAG, \
4321 DECLARE_DIAGNOSTIC_FLAG, \
4322 DECLARE_EXPERIMENTAL_FLAG, \
4323 DECLARE_NOTPRODUCT_FLAG, \
4324 DECLARE_MANAGEABLE_FLAG, \
4325 DECLARE_PRODUCT_RW_FLAG, \
4326 DECLARE_LP64_PRODUCT_FLAG, \
4327 IGNORE_RANGE, \
4328 IGNORE_CONSTRAINT)
4329
4330 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4331 DECLARE_PD_DEVELOPER_FLAG, \
4332 DECLARE_PRODUCT_FLAG, \
4333 DECLARE_PD_PRODUCT_FLAG, \
4334 DECLARE_DIAGNOSTIC_FLAG, \
4335 DECLARE_NOTPRODUCT_FLAG, \
4336 IGNORE_RANGE, \
4337 IGNORE_CONSTRAINT)
4338
4339 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4340 DECLARE_PRODUCT_FLAG, \
4341 DECLARE_DIAGNOSTIC_FLAG, \
4342 DECLARE_EXPERIMENTAL_FLAG, \
4343 DECLARE_NOTPRODUCT_FLAG, \
4344 IGNORE_RANGE, \
4345 IGNORE_CONSTRAINT)
4346
4347 // Extensions
4348
4349 #include "runtime/globals_ext.hpp"
4350
4351 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP