1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/align.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/macros.hpp"
31
32 #include <float.h> // for DBL_MAX
33
34 // The larger HeapWordSize for 64bit requires larger heaps
35 // for the same application running in 64bit. See bug 4967770.
36 // The minimum alignment to a heap word size is done. Other
37 // parts of the memory system may require additional alignment
38 // and are responsible for those alignments.
39 #ifdef _LP64
40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize)
41 #else
42 #define ScaleForWordSize(x) (x)
43 #endif
44
45 // use this for flags that are true per default in the tiered build
46 // but false in non-tiered builds, and vice versa
47 #ifdef TIERED
48 #define trueInTiered true
49 #define falseInTiered false
50 #else
51 #define trueInTiered false
52 #define falseInTiered true
53 #endif
54
55 #include CPU_HEADER(globals)
56 #include OS_HEADER(globals)
57 #include OS_CPU_HEADER(globals)
58 #ifdef COMPILER1
59 #include CPU_HEADER(c1_globals)
60 #include OS_HEADER(c1_globals)
61 #endif
62 #ifdef COMPILER2
63 #include CPU_HEADER(c2_globals)
64 #include OS_HEADER(c2_globals)
65 #endif
66
67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
68 define_pd_global(bool, BackgroundCompilation, false);
69 define_pd_global(bool, UseTLAB, false);
70 define_pd_global(bool, CICompileOSR, false);
71 define_pd_global(bool, UseTypeProfile, false);
72 define_pd_global(bool, UseOnStackReplacement, false);
73 define_pd_global(bool, InlineIntrinsics, false);
74 define_pd_global(bool, PreferInterpreterNativeStubs, true);
75 define_pd_global(bool, ProfileInterpreter, false);
76 define_pd_global(bool, ProfileTraps, false);
77 define_pd_global(bool, TieredCompilation, false);
78
79 define_pd_global(intx, CompileThreshold, 0);
80
81 define_pd_global(intx, OnStackReplacePercentage, 0);
82 define_pd_global(bool, ResizeTLAB, false);
83 define_pd_global(intx, FreqInlineSize, 0);
84 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
85 define_pd_global(bool, InlineClassNatives, true);
86 define_pd_global(bool, InlineUnsafeOps, true);
87 define_pd_global(uintx, InitialCodeCacheSize, 160*K);
88 define_pd_global(uintx, ReservedCodeCacheSize, 32*M);
89 define_pd_global(uintx, NonProfiledCodeHeapSize, 0);
90 define_pd_global(uintx, ProfiledCodeHeapSize, 0);
91 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M);
92
93 define_pd_global(uintx, CodeCacheExpansionSize, 32*K);
94 define_pd_global(uintx, CodeCacheMinBlockLength, 1);
95 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K);
96 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
97 define_pd_global(bool, NeverActAsServerClassMachine, true);
98 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
99 #define CI_COMPILER_COUNT 0
100 #else
101
102 #if COMPILER2_OR_JVMCI
103 #define CI_COMPILER_COUNT 2
104 #else
105 #define CI_COMPILER_COUNT 1
106 #endif // COMPILER2_OR_JVMCI
107
108 #endif // no compilers
109
110 // string type aliases used only in this file
111 typedef const char* ccstr;
112 typedef const char* ccstrlist; // represents string arguments which accumulate
113
114 // function type that will construct default range string
115 typedef const char* (*RangeStrFunc)(void);
116
117 struct Flag {
118 enum Flags {
119 // latest value origin
120 DEFAULT = 0,
121 COMMAND_LINE = 1,
122 ENVIRON_VAR = 2,
123 CONFIG_FILE = 3,
124 MANAGEMENT = 4,
125 ERGONOMIC = 5,
126 ATTACH_ON_DEMAND = 6,
127 INTERNAL = 7,
128
129 LAST_VALUE_ORIGIN = INTERNAL,
130 VALUE_ORIGIN_BITS = 4,
131 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
132
133 // flag kind
134 KIND_PRODUCT = 1 << 4,
135 KIND_MANAGEABLE = 1 << 5,
136 KIND_DIAGNOSTIC = 1 << 6,
137 KIND_EXPERIMENTAL = 1 << 7,
138 KIND_NOT_PRODUCT = 1 << 8,
139 KIND_DEVELOP = 1 << 9,
140 KIND_PLATFORM_DEPENDENT = 1 << 10,
141 KIND_READ_WRITE = 1 << 11,
142 KIND_C1 = 1 << 12,
143 KIND_C2 = 1 << 13,
144 KIND_ARCH = 1 << 14,
145 KIND_LP64_PRODUCT = 1 << 15,
146 KIND_COMMERCIAL = 1 << 16,
147 KIND_JVMCI = 1 << 17,
148
149 // set this bit if the flag was set on the command line
150 ORIG_COMMAND_LINE = 1 << 18,
151
152 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
153 };
154
155 enum Error {
156 // no error
157 SUCCESS = 0,
158 // flag name is missing
159 MISSING_NAME,
160 // flag value is missing
161 MISSING_VALUE,
162 // error parsing the textual form of the value
163 WRONG_FORMAT,
164 // flag is not writable
165 NON_WRITABLE,
166 // flag value is outside of its bounds
167 OUT_OF_BOUNDS,
168 // flag value violates its constraint
169 VIOLATES_CONSTRAINT,
170 // there is no flag with the given name
171 INVALID_FLAG,
172 // the flag can only be set only on command line during invocation of the VM
173 COMMAND_LINE_ONLY,
174 // the flag may only be set once
175 SET_ONLY_ONCE,
176 // the flag is not writable in this combination of product/debug build
177 CONSTANT,
178 // other, unspecified error related to setting the flag
179 ERR_OTHER
180 };
181
182 enum MsgType {
183 NONE = 0,
184 DIAGNOSTIC_FLAG_BUT_LOCKED,
185 EXPERIMENTAL_FLAG_BUT_LOCKED,
186 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
187 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD,
188 COMMERCIAL_FLAG_BUT_DISABLED,
189 COMMERCIAL_FLAG_BUT_LOCKED
190 };
191
192 const char* _type;
193 const char* _name;
194 void* _addr;
195 NOT_PRODUCT(const char* _doc;)
196 Flags _flags;
197 size_t _name_len;
198
199 // points to all Flags static array
200 static Flag* flags;
201
202 // number of flags
203 static size_t numFlags;
204
205 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
206 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
207 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
208
209 static const char* get_int_default_range_str();
210 static const char* get_uint_default_range_str();
211 static const char* get_intx_default_range_str();
212 static const char* get_uintx_default_range_str();
213 static const char* get_uint64_t_default_range_str();
214 static const char* get_size_t_default_range_str();
215 static const char* get_double_default_range_str();
216
217 Flag::Error check_writable(bool changed);
218
219 bool is_bool() const;
220 bool get_bool() const;
221 Flag::Error set_bool(bool value);
222
223 bool is_int() const;
224 int get_int() const;
225 Flag::Error set_int(int value);
226
227 bool is_uint() const;
228 uint get_uint() const;
229 Flag::Error set_uint(uint value);
230
231 bool is_intx() const;
232 intx get_intx() const;
233 Flag::Error set_intx(intx value);
234
235 bool is_uintx() const;
236 uintx get_uintx() const;
237 Flag::Error set_uintx(uintx value);
238
239 bool is_uint64_t() const;
240 uint64_t get_uint64_t() const;
241 Flag::Error set_uint64_t(uint64_t value);
242
243 bool is_size_t() const;
244 size_t get_size_t() const;
245 Flag::Error set_size_t(size_t value);
246
247 bool is_double() const;
248 double get_double() const;
249 Flag::Error set_double(double value);
250
251 bool is_ccstr() const;
252 bool ccstr_accumulates() const;
253 ccstr get_ccstr() const;
254 Flag::Error set_ccstr(ccstr value);
255
256 Flags get_origin();
257 void set_origin(Flags origin);
258
259 size_t get_name_length();
260
261 bool is_default();
262 bool is_ergonomic();
263 bool is_command_line();
264 void set_command_line();
265
266 bool is_product() const;
267 bool is_manageable() const;
268 bool is_diagnostic() const;
269 bool is_experimental() const;
270 bool is_notproduct() const;
271 bool is_develop() const;
272 bool is_read_write() const;
273 bool is_commercial() const;
274
275 bool is_constant_in_binary() const;
276
277 bool is_unlocker() const;
278 bool is_unlocked() const;
279 bool is_writeable() const;
280 bool is_external() const;
281
282 bool is_unlocker_ext() const;
283 bool is_unlocked_ext() const;
284 bool is_writeable_ext() const;
285 bool is_external_ext() const;
286
287 void clear_diagnostic();
288
289 Flag::MsgType get_locked_message(char*, int) const;
290 Flag::MsgType get_locked_message_ext(char*, int) const;
291
292 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
293 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
294 void print_kind(outputStream* st, unsigned int width);
295 void print_origin(outputStream* st, unsigned int width);
296 void print_as_flag(outputStream* st);
297
298 static const char* flag_error_str(Flag::Error error);
299 };
300
301 // debug flags control various aspects of the VM and are global accessible
302
303 // use FlagSetting to temporarily change some debug flag
304 // e.g. FlagSetting fs(DebugThisAndThat, true);
305 // restored to previous value upon leaving scope
306 class FlagSetting {
307 bool val;
308 bool* flag;
309 public:
310 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
311 ~FlagSetting() { *flag = val; }
312 };
313
314
315 class CounterSetting {
316 intx* counter;
317 public:
318 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
319 ~CounterSetting() { (*counter)--; }
320 };
321
322 class IntFlagSetting {
323 int val;
324 int* flag;
325 public:
326 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
327 ~IntFlagSetting() { *flag = val; }
328 };
329
330 class UIntFlagSetting {
331 uint val;
332 uint* flag;
333 public:
334 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
335 ~UIntFlagSetting() { *flag = val; }
336 };
337
338 class UIntXFlagSetting {
339 uintx val;
340 uintx* flag;
341 public:
342 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
343 ~UIntXFlagSetting() { *flag = val; }
344 };
345
346 class DoubleFlagSetting {
347 double val;
348 double* flag;
349 public:
350 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
351 ~DoubleFlagSetting() { *flag = val; }
352 };
353
354 class SizeTFlagSetting {
355 size_t val;
356 size_t* flag;
357 public:
358 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
359 ~SizeTFlagSetting() { *flag = val; }
360 };
361
362 // Helper class for temporarily saving the value of a flag during a scope.
363 template <size_t SIZE>
364 class FlagGuard {
365 unsigned char _value[SIZE];
366 void* const _addr;
367
368 // Hide operator new, this class should only be allocated on the stack.
369 // NOTE: Cannot include memory/allocation.hpp here due to circular
370 // dependencies.
371 void* operator new(size_t size) throw();
372 void* operator new [](size_t size) throw();
373
374 public:
375 FlagGuard(void* flag_addr) : _addr(flag_addr) {
376 memcpy(_value, _addr, SIZE);
377 }
378
379 ~FlagGuard() {
380 memcpy(_addr, _value, SIZE);
381 }
382 };
383
384 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
385
386 class CommandLineFlags {
387 public:
388 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
389 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); }
390 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
391 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
392 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
393
394 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
395 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); }
396 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
397 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
398 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
399
400 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
401 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); }
402 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
403 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
404 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
405
406 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
407 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); }
408 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
409 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
410 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
411
412 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
413 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); }
414 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
415 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
416 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
417
418 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
419 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); }
420 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
421 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
422 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
423
424 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
425 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); }
426 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
427 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
428 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
429
430 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
431 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); }
432 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
433 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
434 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
435
436 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
437 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); }
438 // Contract: Flag will make private copy of the incoming value.
439 // Outgoing value is always malloc-ed, and caller MUST call free.
440 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
441 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
442
443 // Returns false if name is not a command line flag.
444 static bool wasSetOnCmdline(const char* name, bool* value);
445 static void printSetFlags(outputStream* out);
446
447 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
448 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
449
450 static void verify() PRODUCT_RETURN;
451 };
452
453 // use this for flags that are true by default in the debug version but
454 // false in the optimized version, and vice versa
455 #ifdef ASSERT
456 #define trueInDebug true
457 #define falseInDebug false
458 #else
459 #define trueInDebug false
460 #define falseInDebug true
461 #endif
462
463 // use this for flags that are true per default in the product build
464 // but false in development builds, and vice versa
465 #ifdef PRODUCT
466 #define trueInProduct true
467 #define falseInProduct false
468 #else
469 #define trueInProduct false
470 #define falseInProduct true
471 #endif
472
473 // develop flags are settable / visible only during development and are constant in the PRODUCT version
474 // product flags are always settable / visible
475 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
476
477 // A flag must be declared with one of the following types:
478 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
479 // The type "ccstr" is an alias for "const char*" and is used
480 // only in this file, because the macrology requires single-token type names.
481
482 // Note: Diagnostic options not meant for VM tuning or for product modes.
483 // They are to be used for VM quality assurance or field diagnosis
484 // of VM bugs. They are hidden so that users will not be encouraged to
485 // try them as if they were VM ordinary execution options. However, they
486 // are available in the product version of the VM. Under instruction
487 // from support engineers, VM customers can turn them on to collect
488 // diagnostic information about VM problems. To use a VM diagnostic
489 // option, you must first specify +UnlockDiagnosticVMOptions.
490 // (This master switch also affects the behavior of -Xprintflags.)
491 //
492 // experimental flags are in support of features that are not
493 // part of the officially supported product, but are available
494 // for experimenting with. They could, for example, be performance
495 // features that may not have undergone full or rigorous QA, but which may
496 // help performance in some cases and released for experimentation
497 // by the community of users and developers. This flag also allows one to
498 // be able to build a fully supported product that nonetheless also
499 // ships with some unsupported, lightly tested, experimental features.
500 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
501 // UnlockExperimentalVMOptions flag, which allows the control and
502 // modification of the experimental flags.
503 //
504 // Nota bene: neither diagnostic nor experimental options should be used casually,
505 // and they are not supported on production loads, except under explicit
506 // direction from support engineers.
507 //
508 // manageable flags are writeable external product flags.
509 // They are dynamically writeable through the JDK management interface
510 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
511 // These flags are external exported interface (see CCC). The list of
512 // manageable flags can be queried programmatically through the management
513 // interface.
514 //
515 // A flag can be made as "manageable" only if
516 // - the flag is defined in a CCC as an external exported interface.
517 // - the VM implementation supports dynamic setting of the flag.
518 // This implies that the VM must *always* query the flag variable
519 // and not reuse state related to the flag state at any given time.
520 // - you want the flag to be queried programmatically by the customers.
521 //
522 // product_rw flags are writeable internal product flags.
523 // They are like "manageable" flags but for internal/private use.
524 // The list of product_rw flags are internal/private flags which
525 // may be changed/removed in a future release. It can be set
526 // through the management interface to get/set value
527 // when the name of flag is supplied.
528 //
529 // A flag can be made as "product_rw" only if
530 // - the VM implementation supports dynamic setting of the flag.
531 // This implies that the VM must *always* query the flag variable
532 // and not reuse state related to the flag state at any given time.
533 //
534 // Note that when there is a need to support develop flags to be writeable,
535 // it can be done in the same way as product_rw.
536 //
537 // range is a macro that will expand to min and max arguments for range
538 // checking code if provided - see commandLineFlagRangeList.hpp
539 //
540 // constraint is a macro that will expand to custom function call
541 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
542 //
543 // writeable is a macro that controls if and how the value can change during the runtime
544 //
545 // writeable(Always) is optional and allows the flag to have its value changed
546 // without any limitations at any time
547 //
548 // writeable(Once) flag value's can be only set once during the lifetime of VM
549 //
550 // writeable(CommandLineOnly) flag value's can be only set from command line
551 // (multiple times allowed)
552 //
553
554
555 #define RUNTIME_FLAGS(develop, \
556 develop_pd, \
557 product, \
558 product_pd, \
559 diagnostic, \
560 diagnostic_pd, \
561 experimental, \
562 notproduct, \
563 manageable, \
564 product_rw, \
565 lp64_product, \
566 range, \
567 constraint, \
568 writeable) \
569 \
570 lp64_product(bool, UseCompressedOops, false, \
571 "Use 32-bit object references in 64-bit VM. " \
572 "lp64_product means flag is always constant in 32 bit VM") \
573 \
574 lp64_product(bool, UseCompressedClassPointers, false, \
575 "Use 32-bit class pointers in 64-bit VM. " \
576 "lp64_product means flag is always constant in 32 bit VM") \
577 \
578 notproduct(bool, CheckCompressedOops, true, \
579 "Generate checks in encoding/decoding code in debug VM") \
580 \
581 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
582 "Heap allocation steps through preferred address regions to find" \
583 " where it can allocate the heap. Number of steps to take per " \
584 "region.") \
585 range(1, max_uintx) \
586 \
587 lp64_product(intx, ObjectAlignmentInBytes, 8, \
588 "Default object alignment in bytes, 8 is minimum") \
589 range(8, 256) \
590 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
591 \
592 product(bool, AssumeMP, true, \
593 "(Deprecated) Instruct the VM to assume multiple processors are available")\
594 \
595 /* UseMembar is theoretically a temp flag used for memory barrier */ \
596 /* removal testing. It was supposed to be removed before FCS but has */ \
597 /* been re-added (see 6401008) */ \
598 product_pd(bool, UseMembar, \
599 "(Unstable) Issues membars on thread state transitions") \
600 \
601 develop(bool, CleanChunkPoolAsync, true, \
602 "Clean the chunk pool asynchronously") \
603 \
604 product_pd(bool, ThreadLocalHandshakes, \
605 "Use thread-local polls instead of global poll for safepoints.") \
606 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \
607 \
608 diagnostic(uint, HandshakeTimeout, 0, \
609 "If nonzero set a timeout in milliseconds for handshakes") \
610 \
611 experimental(bool, AlwaysSafeConstructors, false, \
612 "Force safe construction, as if all fields are final.") \
613 \
614 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
615 "Enable normal processing of flags relating to field diagnostics")\
616 \
617 experimental(bool, UnlockExperimentalVMOptions, false, \
618 "Enable normal processing of flags relating to experimental " \
619 "features") \
620 \
621 product(bool, JavaMonitorsInStackTrace, true, \
622 "Print information about Java monitor locks when the stacks are" \
623 "dumped") \
624 \
625 product_pd(bool, UseLargePages, \
626 "Use large page memory") \
627 \
628 product_pd(bool, UseLargePagesIndividualAllocation, \
629 "Allocate large pages individually for better affinity") \
630 \
631 develop(bool, LargePagesIndividualAllocationInjectError, false, \
632 "Fail large pages individual allocation") \
633 \
634 product(bool, UseLargePagesInMetaspace, false, \
635 "Use large page memory in metaspace. " \
636 "Only used if UseLargePages is enabled.") \
637 \
638 product(bool, UseNUMA, false, \
639 "Use NUMA if available") \
640 \
641 product(bool, UseNUMAInterleaving, false, \
642 "Interleave memory across NUMA nodes if available") \
643 \
644 product(size_t, NUMAInterleaveGranularity, 2*M, \
645 "Granularity to use for NUMA interleaving on Windows OS") \
646 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
647 \
648 product(bool, ForceNUMA, false, \
649 "Force NUMA optimizations on single-node/UMA systems") \
650 \
651 product(uintx, NUMAChunkResizeWeight, 20, \
652 "Percentage (0-100) used to weight the current sample when " \
653 "computing exponentially decaying average for " \
654 "AdaptiveNUMAChunkSizing") \
655 range(0, 100) \
656 \
657 product(size_t, NUMASpaceResizeRate, 1*G, \
658 "Do not reallocate more than this amount per collection") \
659 range(0, max_uintx) \
660 \
661 product(bool, UseAdaptiveNUMAChunkSizing, true, \
662 "Enable adaptive chunk sizing for NUMA") \
663 \
664 product(bool, NUMAStats, false, \
665 "Print NUMA stats in detailed heap information") \
666 \
667 product(uintx, NUMAPageScanRate, 256, \
668 "Maximum number of pages to include in the page scan procedure") \
669 range(0, max_uintx) \
670 \
671 product_pd(bool, NeedsDeoptSuspend, \
672 "True for register window machines (sparc/ia64)") \
673 \
674 product(bool, UseAES, false, \
675 "Control whether AES instructions are used when available") \
676 \
677 product(bool, UseFMA, false, \
678 "Control whether FMA instructions are used when available") \
679 \
680 product(bool, UseSHA, false, \
681 "Control whether SHA instructions are used when available") \
682 \
683 diagnostic(bool, UseGHASHIntrinsics, false, \
684 "Use intrinsics for GHASH versions of crypto") \
685 \
686 product(size_t, LargePageSizeInBytes, 0, \
687 "Large page size (0 to let VM choose the page size)") \
688 range(0, max_uintx) \
689 \
690 product(size_t, LargePageHeapSizeThreshold, 128*M, \
691 "Use large pages if maximum heap is at least this big") \
692 range(0, max_uintx) \
693 \
694 product(bool, ForceTimeHighResolution, false, \
695 "Using high time resolution (for Win32 only)") \
696 \
697 develop(bool, TracePcPatching, false, \
698 "Trace usage of frame::patch_pc") \
699 \
700 develop(bool, TraceRelocator, false, \
701 "Trace the bytecode relocator") \
702 \
703 develop(bool, TraceLongCompiles, false, \
704 "Print out every time compilation is longer than " \
705 "a given threshold") \
706 \
707 develop(bool, SafepointALot, false, \
708 "Generate a lot of safepoints. This works with " \
709 "GuaranteedSafepointInterval") \
710 \
711 product_pd(bool, BackgroundCompilation, \
712 "A thread requesting compilation is not blocked during " \
713 "compilation") \
714 \
715 product(bool, PrintVMQWaitTime, false, \
716 "Print out the waiting time in VM operation queue") \
717 \
718 product(bool, MethodFlushing, true, \
719 "Reclamation of zombie and not-entrant methods") \
720 \
721 develop(bool, VerifyStack, false, \
722 "Verify stack of each thread when it is entering a runtime call") \
723 \
724 diagnostic(bool, ForceUnreachable, false, \
725 "Make all non code cache addresses to be unreachable by " \
726 "forcing use of 64bit literal fixups") \
727 \
728 notproduct(bool, StressDerivedPointers, false, \
729 "Force scavenge when a derived pointer is detected on stack " \
730 "after rtm call") \
731 \
732 develop(bool, TraceDerivedPointers, false, \
733 "Trace traversal of derived pointers on stack") \
734 \
735 notproduct(bool, TraceCodeBlobStacks, false, \
736 "Trace stack-walk of codeblobs") \
737 \
738 product(bool, PrintJNIResolving, false, \
739 "Used to implement -v:jni") \
740 \
741 notproduct(bool, PrintRewrites, false, \
742 "Print methods that are being rewritten") \
743 \
744 product(bool, UseInlineCaches, true, \
745 "Use Inline Caches for virtual calls ") \
746 \
747 diagnostic(bool, InlineArrayCopy, true, \
748 "Inline arraycopy native that is known to be part of " \
749 "base library DLL") \
750 \
751 diagnostic(bool, InlineObjectHash, true, \
752 "Inline Object::hashCode() native that is known to be part " \
753 "of base library DLL") \
754 \
755 diagnostic(bool, InlineNatives, true, \
756 "Inline natives that are known to be part of base library DLL") \
757 \
758 diagnostic(bool, InlineMathNatives, true, \
759 "Inline SinD, CosD, etc.") \
760 \
761 diagnostic(bool, InlineClassNatives, true, \
762 "Inline Class.isInstance, etc") \
763 \
764 diagnostic(bool, InlineThreadNatives, true, \
765 "Inline Thread.currentThread, etc") \
766 \
767 diagnostic(bool, InlineUnsafeOps, true, \
768 "Inline memory ops (native methods) from Unsafe") \
769 \
770 product(bool, CriticalJNINatives, true, \
771 "Check for critical JNI entry points") \
772 \
773 notproduct(bool, StressCriticalJNINatives, false, \
774 "Exercise register saving code in critical natives") \
775 \
776 diagnostic(bool, UseAESIntrinsics, false, \
777 "Use intrinsics for AES versions of crypto") \
778 \
779 diagnostic(bool, UseAESCTRIntrinsics, false, \
780 "Use intrinsics for the paralleled version of AES/CTR crypto") \
781 \
782 diagnostic(bool, UseSHA1Intrinsics, false, \
783 "Use intrinsics for SHA-1 crypto hash function. " \
784 "Requires that UseSHA is enabled.") \
785 \
786 diagnostic(bool, UseSHA256Intrinsics, false, \
787 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
788 "Requires that UseSHA is enabled.") \
789 \
790 diagnostic(bool, UseSHA512Intrinsics, false, \
791 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
792 "Requires that UseSHA is enabled.") \
793 \
794 diagnostic(bool, UseCRC32Intrinsics, false, \
795 "use intrinsics for java.util.zip.CRC32") \
796 \
797 diagnostic(bool, UseCRC32CIntrinsics, false, \
798 "use intrinsics for java.util.zip.CRC32C") \
799 \
800 diagnostic(bool, UseAdler32Intrinsics, false, \
801 "use intrinsics for java.util.zip.Adler32") \
802 \
803 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
804 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
805 \
806 diagnostic(ccstrlist, DisableIntrinsic, "", \
807 "do not expand intrinsics whose (internal) names appear here") \
808 \
809 develop(bool, TraceCallFixup, false, \
810 "Trace all call fixups") \
811 \
812 develop(bool, DeoptimizeALot, false, \
813 "Deoptimize at every exit from the runtime system") \
814 \
815 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
816 "A comma separated list of bcis to deoptimize at") \
817 \
818 product(bool, DeoptimizeRandom, false, \
819 "Deoptimize random frames on random exit from the runtime system")\
820 \
821 notproduct(bool, ZombieALot, false, \
822 "Create zombies (non-entrant) at exit from the runtime system") \
823 \
824 product(bool, UnlinkSymbolsALot, false, \
825 "Unlink unreferenced symbols from the symbol table at safepoints")\
826 \
827 notproduct(bool, WalkStackALot, false, \
828 "Trace stack (no print) at every exit from the runtime system") \
829 \
830 product(bool, Debugging, false, \
831 "Set when executing debug methods in debug.cpp " \
832 "(to prevent triggering assertions)") \
833 \
834 notproduct(bool, StrictSafepointChecks, trueInDebug, \
835 "Enable strict checks that safepoints cannot happen for threads " \
836 "that use NoSafepointVerifier") \
837 \
838 notproduct(bool, VerifyLastFrame, false, \
839 "Verify oops on last frame on entry to VM") \
840 \
841 product(bool, FailOverToOldVerifier, true, \
842 "Fail over to old verifier when split verifier fails") \
843 \
844 product(bool, SafepointTimeout, false, \
845 "Time out and warn or fail after SafepointTimeoutDelay " \
846 "milliseconds if failed to reach safepoint") \
847 \
848 develop(bool, DieOnSafepointTimeout, false, \
849 "Die upon failure to reach safepoint (see SafepointTimeout)") \
850 \
851 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
852 /* typically, at most a few retries are needed */ \
853 product(intx, SuspendRetryCount, 50, \
854 "Maximum retry count for an external suspend request") \
855 range(0, max_intx) \
856 \
857 product(intx, SuspendRetryDelay, 5, \
858 "Milliseconds to delay per retry (* current_retry_count)") \
859 range(0, max_intx) \
860 \
861 product(bool, AssertOnSuspendWaitFailure, false, \
862 "Assert/Guarantee on external suspend wait failure") \
863 \
864 product(bool, TraceSuspendWaitFailures, false, \
865 "Trace external suspend wait failures") \
866 \
867 product(bool, MaxFDLimit, true, \
868 "Bump the number of file descriptors to maximum in Solaris") \
869 \
870 diagnostic(bool, LogEvents, true, \
871 "Enable the various ring buffer event logs") \
872 \
873 diagnostic(uintx, LogEventsBufferEntries, 10, \
874 "Number of ring buffer event logs") \
875 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
876 \
877 product(bool, BytecodeVerificationRemote, true, \
878 "Enable the Java bytecode verifier for remote classes") \
879 \
880 product(bool, BytecodeVerificationLocal, false, \
881 "Enable the Java bytecode verifier for local classes") \
882 \
883 develop(bool, ForceFloatExceptions, trueInDebug, \
884 "Force exceptions on FP stack under/overflow") \
885 \
886 develop(bool, VerifyStackAtCalls, false, \
887 "Verify that the stack pointer is unchanged after calls") \
888 \
889 develop(bool, TraceJavaAssertions, false, \
890 "Trace java language assertions") \
891 \
892 notproduct(bool, VerifyCodeCache, false, \
893 "Verify code cache on memory allocation/deallocation") \
894 \
895 develop(bool, UseMallocOnly, false, \
896 "Use only malloc/free for allocation (no resource area/arena)") \
897 \
898 develop(bool, PrintMallocStatistics, false, \
899 "Print malloc/free statistics") \
900 \
901 develop(bool, ZapResourceArea, trueInDebug, \
902 "Zap freed resource/arena space with 0xABABABAB") \
903 \
904 notproduct(bool, ZapVMHandleArea, trueInDebug, \
905 "Zap freed VM handle space with 0xBCBCBCBC") \
906 \
907 notproduct(bool, ZapStackSegments, trueInDebug, \
908 "Zap allocated/freed stack segments with 0xFADFADED") \
909 \
910 develop(bool, ZapUnusedHeapArea, trueInDebug, \
911 "Zap unused heap space with 0xBAADBABE") \
912 \
913 develop(bool, CheckZapUnusedHeapArea, false, \
914 "Check zapping of unused heap space") \
915 \
916 develop(bool, ZapFillerObjects, trueInDebug, \
917 "Zap filler objects with 0xDEAFBABE") \
918 \
919 develop(bool, PrintVMMessages, true, \
920 "Print VM messages on console") \
921 \
922 notproduct(uintx, ErrorHandlerTest, 0, \
923 "If > 0, provokes an error after VM initialization; the value " \
924 "determines which error to provoke. See test_error_handler() " \
925 "in vmError.cpp.") \
926 \
927 notproduct(uintx, TestCrashInErrorHandler, 0, \
928 "If > 0, provokes an error inside VM error handler (a secondary " \
929 "crash). see test_error_handler() in vmError.cpp") \
930 \
931 notproduct(bool, TestSafeFetchInErrorHandler, false, \
932 "If true, tests SafeFetch inside error handler.") \
933 \
934 notproduct(bool, TestUnresponsiveErrorHandler, false, \
935 "If true, simulates an unresponsive error handler.") \
936 \
937 develop(bool, Verbose, false, \
938 "Print additional debugging information from other modes") \
939 \
940 develop(bool, PrintMiscellaneous, false, \
941 "Print uncategorized debugging information (requires +Verbose)") \
942 \
943 develop(bool, WizardMode, false, \
944 "Print much more debugging information") \
945 \
946 product(bool, ShowMessageBoxOnError, false, \
947 "Keep process alive on VM fatal error") \
948 \
949 product(bool, CreateCoredumpOnCrash, true, \
950 "Create core/mini dump on VM fatal error") \
951 \
952 product(uint64_t, ErrorLogTimeout, 2 * 60, \
953 "Timeout, in seconds, to limit the time spent on writing an " \
954 "error log in case of a crash.") \
955 range(0, (uint64_t)max_jlong/1000) \
956 \
957 product_pd(bool, UseOSErrorReporting, \
958 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
959 \
960 product(bool, SuppressFatalErrorMessage, false, \
961 "Report NO fatal error message (avoid deadlock)") \
962 \
963 product(ccstrlist, OnError, "", \
964 "Run user-defined commands on fatal error; see VMError.cpp " \
965 "for examples") \
966 \
967 product(ccstrlist, OnOutOfMemoryError, "", \
968 "Run user-defined commands on first java.lang.OutOfMemoryError") \
969 \
970 manageable(bool, HeapDumpBeforeFullGC, false, \
971 "Dump heap to file before any major stop-the-world GC") \
972 \
973 manageable(bool, HeapDumpAfterFullGC, false, \
974 "Dump heap to file after any major stop-the-world GC") \
975 \
976 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
977 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
978 \
979 manageable(ccstr, HeapDumpPath, NULL, \
980 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
981 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
982 "in the working directory)") \
983 \
984 develop(bool, BreakAtWarning, false, \
985 "Execute breakpoint upon encountering VM warning") \
986 \
987 develop(bool, UseFakeTimers, false, \
988 "Tell whether the VM should use system time or a fake timer") \
989 \
990 product(ccstr, NativeMemoryTracking, "off", \
991 "Native memory tracking options") \
992 \
993 diagnostic(bool, PrintNMTStatistics, false, \
994 "Print native memory tracking summary data if it is on") \
995 \
996 diagnostic(bool, LogCompilation, false, \
997 "Log compilation activity in detail to LogFile") \
998 \
999 product(bool, PrintCompilation, false, \
1000 "Print compilations") \
1001 \
1002 diagnostic(bool, TraceNMethodInstalls, false, \
1003 "Trace nmethod installation") \
1004 \
1005 diagnostic(intx, ScavengeRootsInCode, 2, \
1006 "0: do not allow scavengable oops in the code cache; " \
1007 "1: allow scavenging from the code cache; " \
1008 "2: emit as many constants as the compiler can see") \
1009 range(0, 2) \
1010 \
1011 product(bool, AlwaysRestoreFPU, false, \
1012 "Restore the FPU control word after every JNI call (expensive)") \
1013 \
1014 diagnostic(bool, PrintCompilation2, false, \
1015 "Print additional statistics per compilation") \
1016 \
1017 diagnostic(bool, PrintAdapterHandlers, false, \
1018 "Print code generated for i2c/c2i adapters") \
1019 \
1020 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1021 "Verify that i2c/c2i adapters are called properly") \
1022 \
1023 develop(bool, VerifyAdapterSharing, false, \
1024 "Verify that the code for shared adapters is the equivalent") \
1025 \
1026 diagnostic(bool, PrintAssembly, false, \
1027 "Print assembly code (using external disassembler.so)") \
1028 \
1029 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1030 "Print options string passed to disassembler.so") \
1031 \
1032 notproduct(bool, PrintNMethodStatistics, false, \
1033 "Print a summary statistic for the generated nmethods") \
1034 \
1035 diagnostic(bool, PrintNMethods, false, \
1036 "Print assembly code for nmethods when generated") \
1037 \
1038 diagnostic(bool, PrintNativeNMethods, false, \
1039 "Print assembly code for native nmethods when generated") \
1040 \
1041 develop(bool, PrintDebugInfo, false, \
1042 "Print debug information for all nmethods when generated") \
1043 \
1044 develop(bool, PrintRelocations, false, \
1045 "Print relocation information for all nmethods when generated") \
1046 \
1047 develop(bool, PrintDependencies, false, \
1048 "Print dependency information for all nmethods when generated") \
1049 \
1050 develop(bool, PrintExceptionHandlers, false, \
1051 "Print exception handler tables for all nmethods when generated") \
1052 \
1053 develop(bool, StressCompiledExceptionHandlers, false, \
1054 "Exercise compiled exception handlers") \
1055 \
1056 develop(bool, InterceptOSException, false, \
1057 "Start debugger when an implicit OS (e.g. NULL) " \
1058 "exception happens") \
1059 \
1060 product(bool, PrintCodeCache, false, \
1061 "Print the code cache memory usage when exiting") \
1062 \
1063 develop(bool, PrintCodeCache2, false, \
1064 "Print detailed usage information on the code cache when exiting")\
1065 \
1066 product(bool, PrintCodeCacheOnCompilation, false, \
1067 "Print the code cache memory usage each time a method is " \
1068 "compiled") \
1069 \
1070 diagnostic(bool, PrintStubCode, false, \
1071 "Print generated stub code") \
1072 \
1073 product(bool, StackTraceInThrowable, true, \
1074 "Collect backtrace in throwable when exception happens") \
1075 \
1076 product(bool, OmitStackTraceInFastThrow, true, \
1077 "Omit backtraces for some 'hot' exceptions in optimized code") \
1078 \
1079 product(bool, ProfilerPrintByteCodeStatistics, false, \
1080 "Print bytecode statistics when dumping profiler output") \
1081 \
1082 product(bool, ProfilerRecordPC, false, \
1083 "Collect ticks for each 16 byte interval of compiled code") \
1084 \
1085 product(bool, ProfileVM, false, \
1086 "Profile ticks that fall within VM (either in the VM Thread " \
1087 "or VM code called through stubs)") \
1088 \
1089 product(bool, ProfileIntervals, false, \
1090 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1091 \
1092 notproduct(bool, ProfilerCheckIntervals, false, \
1093 "Collect and print information on spacing of profiler ticks") \
1094 \
1095 product(bool, PrintWarnings, true, \
1096 "Print JVM warnings to output stream") \
1097 \
1098 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1099 "Print warnings for stalled SpinLocks") \
1100 \
1101 product(bool, RegisterFinalizersAtInit, true, \
1102 "Register finalizable objects at end of Object.<init> or " \
1103 "after allocation") \
1104 \
1105 develop(bool, RegisterReferences, true, \
1106 "Tell whether the VM should register soft/weak/final/phantom " \
1107 "references") \
1108 \
1109 develop(bool, IgnoreRewrites, false, \
1110 "Suppress rewrites of bytecodes in the oopmap generator. " \
1111 "This is unsafe!") \
1112 \
1113 develop(bool, PrintCodeCacheExtension, false, \
1114 "Print extension of code cache") \
1115 \
1116 develop(bool, UsePrivilegedStack, true, \
1117 "Enable the security JVM functions") \
1118 \
1119 develop(bool, ProtectionDomainVerification, true, \
1120 "Verify protection domain before resolution in system dictionary")\
1121 \
1122 product(bool, ClassUnloading, true, \
1123 "Do unloading of classes") \
1124 \
1125 product(bool, ClassUnloadingWithConcurrentMark, true, \
1126 "Do unloading of classes with a concurrent marking cycle") \
1127 \
1128 develop(bool, DisableStartThread, false, \
1129 "Disable starting of additional Java threads " \
1130 "(for debugging only)") \
1131 \
1132 develop(bool, MemProfiling, false, \
1133 "Write memory usage profiling to log file") \
1134 \
1135 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1136 "Print the system dictionary at exit") \
1137 \
1138 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \
1139 "Dynamically resize system dictionaries as needed") \
1140 \
1141 product(bool, AlwaysLockClassLoader, false, \
1142 "Require the VM to acquire the class loader lock before calling " \
1143 "loadClass() even for class loaders registering " \
1144 "as parallel capable") \
1145 \
1146 product(bool, AllowParallelDefineClass, false, \
1147 "Allow parallel defineClass requests for class loaders " \
1148 "registering as parallel capable") \
1149 \
1150 product_pd(bool, DontYieldALot, \
1151 "Throw away obvious excess yield calls") \
1152 \
1153 develop(bool, UseDetachedThreads, true, \
1154 "Use detached threads that are recycled upon termination " \
1155 "(for Solaris only)") \
1156 \
1157 experimental(bool, DisablePrimordialThreadGuardPages, false, \
1158 "Disable the use of stack guard pages if the JVM is loaded " \
1159 "on the primordial process thread") \
1160 \
1161 product(bool, UseLWPSynchronization, true, \
1162 "Use LWP-based instead of libthread-based synchronization " \
1163 "(SPARC only)") \
1164 \
1165 experimental(ccstr, SyncKnobs, NULL, \
1166 "(Unstable) Various monitor synchronization tunables") \
1167 \
1168 experimental(intx, EmitSync, 0, \
1169 "(Unsafe, Unstable) " \
1170 "Control emission of inline sync fast-path code") \
1171 \
1172 product(intx, MonitorBound, 0, "Bound Monitor population") \
1173 range(0, max_jint) \
1174 \
1175 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \
1176 \
1177 experimental(intx, MonitorUsedDeflationThreshold, 90, \
1178 "Percentage of used monitors before triggering cleanup " \
1179 "safepoint which deflates monitors (0 is off). " \
1180 "The check is performed on GuaranteedSafepointInterval.") \
1181 range(0, 100) \
1182 \
1183 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1184 "Experimental Sync flags") \
1185 \
1186 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1187 \
1188 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1189 \
1190 experimental(intx, hashCode, 5, \
1191 "(Unstable) select hashCode generation algorithm") \
1192 \
1193 product(bool, FilterSpuriousWakeups, true, \
1194 "When true prevents OS-level spurious, or premature, wakeups " \
1195 "from Object.wait (Ignored for Windows)") \
1196 \
1197 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1198 \
1199 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1200 \
1201 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1202 \
1203 develop(bool, UsePthreads, false, \
1204 "Use pthread-based instead of libthread-based synchronization " \
1205 "(SPARC only)") \
1206 \
1207 product(bool, ReduceSignalUsage, false, \
1208 "Reduce the use of OS signals in Java and/or the VM") \
1209 \
1210 develop_pd(bool, ShareVtableStubs, \
1211 "Share vtable stubs (smaller code but worse branch prediction") \
1212 \
1213 develop(bool, LoadLineNumberTables, true, \
1214 "Tell whether the class file parser loads line number tables") \
1215 \
1216 develop(bool, LoadLocalVariableTables, true, \
1217 "Tell whether the class file parser loads local variable tables") \
1218 \
1219 develop(bool, LoadLocalVariableTypeTables, true, \
1220 "Tell whether the class file parser loads local variable type" \
1221 "tables") \
1222 \
1223 product(bool, AllowUserSignalHandlers, false, \
1224 "Do not complain if the application installs signal handlers " \
1225 "(Solaris & Linux only)") \
1226 \
1227 product(bool, UseSignalChaining, true, \
1228 "Use signal-chaining to invoke signal handlers installed " \
1229 "by the application (Solaris & Linux only)") \
1230 \
1231 product(bool, AllowJNIEnvProxy, false, \
1232 "Allow JNIEnv proxies for jdbx") \
1233 \
1234 product(bool, RestoreMXCSROnJNICalls, false, \
1235 "Restore MXCSR when returning from JNI calls") \
1236 \
1237 product(bool, CheckJNICalls, false, \
1238 "Verify all arguments to JNI calls") \
1239 \
1240 product(bool, UseFastJNIAccessors, true, \
1241 "Use optimized versions of Get<Primitive>Field") \
1242 \
1243 product(intx, MaxJNILocalCapacity, 65536, \
1244 "Maximum allowable local JNI handle capacity to " \
1245 "EnsureLocalCapacity() and PushLocalFrame(), " \
1246 "where <= 0 is unlimited, default: 65536") \
1247 range(min_intx, max_intx) \
1248 \
1249 product(bool, EagerXrunInit, false, \
1250 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1251 "but not all -Xrun libraries may support the state of the VM " \
1252 "at this time") \
1253 \
1254 product(bool, PreserveAllAnnotations, false, \
1255 "Preserve RuntimeInvisibleAnnotations as well " \
1256 "as RuntimeVisibleAnnotations") \
1257 \
1258 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1259 "Number of OutOfMemoryErrors preallocated with backtrace") \
1260 \
1261 product(bool, UseXMMForArrayCopy, false, \
1262 "Use SSE2 MOVQ instruction for Arraycopy") \
1263 \
1264 product(intx, FieldsAllocationStyle, 1, \
1265 "0 - type based with oops first, " \
1266 "1 - with oops last, " \
1267 "2 - oops in super and sub classes are together") \
1268 range(0, 2) \
1269 \
1270 product(bool, CompactFields, true, \
1271 "Allocate nonstatic fields in gaps between previous fields") \
1272 \
1273 notproduct(bool, PrintFieldLayout, false, \
1274 "Print field layout for each class") \
1275 \
1276 /* Need to limit the extent of the padding to reasonable size. */\
1277 /* 8K is well beyond the reasonable HW cache line size, even with */\
1278 /* aggressive prefetching, while still leaving the room for segregating */\
1279 /* among the distinct pages. */\
1280 product(intx, ContendedPaddingWidth, 128, \
1281 "How many bytes to pad the fields/classes marked @Contended with")\
1282 range(0, 8192) \
1283 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1284 \
1285 product(bool, EnableContended, true, \
1286 "Enable @Contended annotation support") \
1287 \
1288 product(bool, RestrictContended, true, \
1289 "Restrict @Contended to trusted classes") \
1290 \
1291 product(bool, UseBiasedLocking, true, \
1292 "Enable biased locking in JVM") \
1293 \
1294 product(intx, BiasedLockingStartupDelay, 0, \
1295 "Number of milliseconds to wait before enabling biased locking") \
1296 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1297 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1298 \
1299 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1300 "Print statistics of biased locking in JVM") \
1301 \
1302 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1303 "Threshold of number of revocations per type to try to " \
1304 "rebias all objects in the heap of that type") \
1305 range(0, max_intx) \
1306 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1307 \
1308 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1309 "Threshold of number of revocations per type to permanently " \
1310 "revoke biases of all objects in the heap of that type") \
1311 range(0, max_intx) \
1312 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1313 \
1314 product(intx, BiasedLockingDecayTime, 25000, \
1315 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1316 "type after previous bulk rebias") \
1317 range(500, max_intx) \
1318 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1319 \
1320 product(bool, ExitOnOutOfMemoryError, false, \
1321 "JVM exits on the first occurrence of an out-of-memory error") \
1322 \
1323 product(bool, CrashOnOutOfMemoryError, false, \
1324 "JVM aborts, producing an error log and core/mini dump, on the " \
1325 "first occurrence of an out-of-memory error") \
1326 \
1327 /* tracing */ \
1328 \
1329 develop(bool, StressRewriter, false, \
1330 "Stress linktime bytecode rewriting") \
1331 \
1332 product(ccstr, TraceJVMTI, NULL, \
1333 "Trace flags for JVMTI functions and events") \
1334 \
1335 /* This option can change an EMCP method into an obsolete method. */ \
1336 /* This can affect tests that except specific methods to be EMCP. */ \
1337 /* This option should be used with caution. */ \
1338 product(bool, StressLdcRewrite, false, \
1339 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1340 \
1341 /* change to false by default sometime after Mustang */ \
1342 product(bool, VerifyMergedCPBytecodes, true, \
1343 "Verify bytecodes after RedefineClasses constant pool merging") \
1344 \
1345 develop(bool, TraceBytecodes, false, \
1346 "Trace bytecode execution") \
1347 \
1348 develop(bool, TraceICs, false, \
1349 "Trace inline cache changes") \
1350 \
1351 notproduct(bool, TraceInvocationCounterOverflow, false, \
1352 "Trace method invocation counter overflow") \
1353 \
1354 develop(bool, TraceInlineCacheClearing, false, \
1355 "Trace clearing of inline caches in nmethods") \
1356 \
1357 develop(bool, TraceDependencies, false, \
1358 "Trace dependencies") \
1359 \
1360 develop(bool, VerifyDependencies, trueInDebug, \
1361 "Exercise and verify the compilation dependency mechanism") \
1362 \
1363 develop(bool, TraceNewOopMapGeneration, false, \
1364 "Trace OopMapGeneration") \
1365 \
1366 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1367 "Trace OopMapGeneration: print detailed cell states") \
1368 \
1369 develop(bool, TimeOopMap, false, \
1370 "Time calls to GenerateOopMap::compute_map() in sum") \
1371 \
1372 develop(bool, TimeOopMap2, false, \
1373 "Time calls to GenerateOopMap::compute_map() individually") \
1374 \
1375 develop(bool, TraceOopMapRewrites, false, \
1376 "Trace rewriting of method oops during oop map generation") \
1377 \
1378 develop(bool, TraceICBuffer, false, \
1379 "Trace usage of IC buffer") \
1380 \
1381 develop(bool, TraceCompiledIC, false, \
1382 "Trace changes of compiled IC") \
1383 \
1384 /* gc */ \
1385 \
1386 product(bool, UseSerialGC, false, \
1387 "Use the Serial garbage collector") \
1388 \
1389 product(bool, UseG1GC, false, \
1390 "Use the Garbage-First garbage collector") \
1391 \
1392 product(bool, UseParallelGC, false, \
1393 "Use the Parallel Scavenge garbage collector") \
1394 \
1395 product(bool, UseParallelOldGC, false, \
1396 "Use the Parallel Old garbage collector") \
1397 \
1398 product(uintx, HeapMaximumCompactionInterval, 20, \
1399 "How often should we maximally compact the heap (not allowing " \
1400 "any dead space)") \
1401 range(0, max_uintx) \
1402 \
1403 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1404 "The collection count for the first maximum compaction") \
1405 range(0, max_uintx) \
1406 \
1407 product(bool, UseMaximumCompactionOnSystemGC, true, \
1408 "Use maximum compaction in the Parallel Old garbage collector " \
1409 "for a system GC") \
1410 \
1411 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1412 "The mean used by the parallel compact dead wood " \
1413 "limiter (a number between 0-100)") \
1414 range(0, 100) \
1415 \
1416 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1417 "The standard deviation used by the parallel compact dead wood " \
1418 "limiter (a number between 0-100)") \
1419 range(0, 100) \
1420 \
1421 product(uint, ParallelGCThreads, 0, \
1422 "Number of parallel threads parallel gc will use") \
1423 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1424 \
1425 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1426 "Use semaphore synchronization for the GC Threads, " \
1427 "instead of synchronization based on mutexes") \
1428 \
1429 product(bool, UseDynamicNumberOfGCThreads, true, \
1430 "Dynamically choose the number of threads up to a maximum of " \
1431 "ParallelGCThreads parallel collectors will use for garbage " \
1432 "collection work") \
1433 \
1434 diagnostic(bool, InjectGCWorkerCreationFailure, false, \
1435 "Inject thread creation failures for " \
1436 "UseDynamicNumberOfGCThreads") \
1437 \
1438 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1439 "Force dynamic selection of the number of " \
1440 "parallel threads parallel gc will use to aid debugging") \
1441 \
1442 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1443 "Size of heap (bytes) per GC thread used in calculating the " \
1444 "number of GC threads") \
1445 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1446 \
1447 product(uint, ConcGCThreads, 0, \
1448 "Number of threads concurrent gc will use") \
1449 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1450 \
1451 product(uint, GCTaskTimeStampEntries, 200, \
1452 "Number of time stamp entries per gc worker thread") \
1453 range(1, max_jint) \
1454 \
1455 product(bool, AlwaysTenure, false, \
1456 "Always tenure objects in eden (ParallelGC only)") \
1457 \
1458 product(bool, NeverTenure, false, \
1459 "Never tenure objects in eden, may tenure on overflow " \
1460 "(ParallelGC only)") \
1461 \
1462 product(bool, ScavengeBeforeFullGC, true, \
1463 "Scavenge youngest generation before each full GC.") \
1464 \
1465 product(bool, UseConcMarkSweepGC, false, \
1466 "Use Concurrent Mark-Sweep GC in the old generation") \
1467 \
1468 product(bool, ExplicitGCInvokesConcurrent, false, \
1469 "A System.gc() request invokes a concurrent collection; " \
1470 "(effective only when using concurrent collectors)") \
1471 \
1472 product(bool, GCLockerInvokesConcurrent, false, \
1473 "The exit of a JNI critical section necessitating a scavenge, " \
1474 "also kicks off a background concurrent collection") \
1475 \
1476 product(uintx, GCLockerEdenExpansionPercent, 5, \
1477 "How much the GC can expand the eden by while the GC locker " \
1478 "is active (as a percentage)") \
1479 range(0, 100) \
1480 \
1481 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1482 "Number of times to retry allocations when " \
1483 "blocked by the GC locker") \
1484 range(0, max_uintx) \
1485 \
1486 product(bool, UseCMSBestFit, true, \
1487 "Use CMS best fit allocation strategy") \
1488 \
1489 product(uintx, ParallelGCBufferWastePct, 10, \
1490 "Wasted fraction of parallel allocation buffer") \
1491 range(0, 100) \
1492 \
1493 product(uintx, TargetPLABWastePct, 10, \
1494 "Target wasted space in last buffer as percent of overall " \
1495 "allocation") \
1496 range(1, 100) \
1497 \
1498 product(uintx, PLABWeight, 75, \
1499 "Percentage (0-100) used to weight the current sample when " \
1500 "computing exponentially decaying average for ResizePLAB") \
1501 range(0, 100) \
1502 \
1503 product(bool, ResizePLAB, true, \
1504 "Dynamically resize (survivor space) promotion LAB's") \
1505 \
1506 product(int, ParGCArrayScanChunk, 50, \
1507 "Scan a subset of object array and push remainder, if array is " \
1508 "bigger than this") \
1509 range(1, max_jint/3) \
1510 \
1511 product(bool, ParGCUseLocalOverflow, false, \
1512 "Instead of a global overflow list, use local overflow stacks") \
1513 \
1514 product(bool, ParGCTrimOverflow, true, \
1515 "Eagerly trim the local overflow lists " \
1516 "(when ParGCUseLocalOverflow)") \
1517 \
1518 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1519 "Simulate work queue overflow in ParNew") \
1520 \
1521 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1522 "An `interval' counter that determines how frequently " \
1523 "we simulate overflow; a smaller number increases frequency") \
1524 \
1525 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1526 "The desired number of objects to claim from the overflow list") \
1527 range(0, max_uintx) \
1528 \
1529 diagnostic(uintx, ParGCStridesPerThread, 2, \
1530 "The number of strides per worker thread that we divide up the " \
1531 "card table scanning work into") \
1532 range(1, max_uintx) \
1533 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1534 \
1535 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1536 "The number of cards in each chunk of the parallel chunks used " \
1537 "during card table scanning") \
1538 range(1, max_intx) \
1539 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1540 \
1541 product(uintx, OldPLABWeight, 50, \
1542 "Percentage (0-100) used to weight the current sample when " \
1543 "computing exponentially decaying average for resizing " \
1544 "OldPLABSize") \
1545 range(0, 100) \
1546 \
1547 product(bool, ResizeOldPLAB, true, \
1548 "Dynamically resize (old gen) promotion LAB's") \
1549 \
1550 product(size_t, CMSOldPLABMax, 1024, \
1551 "Maximum size of CMS gen promotion LAB caches per worker " \
1552 "per block size") \
1553 range(1, max_uintx) \
1554 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1555 \
1556 product(size_t, CMSOldPLABMin, 16, \
1557 "Minimum size of CMS gen promotion LAB caches per worker " \
1558 "per block size") \
1559 range(1, max_uintx) \
1560 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1561 \
1562 product(uintx, CMSOldPLABNumRefills, 4, \
1563 "Nominal number of refills of CMS gen promotion LAB cache " \
1564 "per worker per block size") \
1565 range(1, max_uintx) \
1566 \
1567 product(bool, CMSOldPLABResizeQuicker, false, \
1568 "React on-the-fly during a scavenge to a sudden " \
1569 "change in block demand rate") \
1570 \
1571 product(uintx, CMSOldPLABToleranceFactor, 4, \
1572 "The tolerance of the phase-change detector for on-the-fly " \
1573 "PLAB resizing during a scavenge") \
1574 range(1, max_uintx) \
1575 \
1576 product(uintx, CMSOldPLABReactivityFactor, 2, \
1577 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1578 "during a scavenge") \
1579 range(1, max_uintx) \
1580 \
1581 product(bool, AlwaysPreTouch, false, \
1582 "Force all freshly committed pages to be pre-touched") \
1583 \
1584 product(size_t, PreTouchParallelChunkSize, 1 * G, \
1585 "Per-thread chunk size for parallel memory pre-touch.") \
1586 range(1, SIZE_MAX / 2) \
1587 \
1588 product_pd(size_t, CMSYoungGenPerWorker, \
1589 "The maximum size of young gen chosen by default per GC worker " \
1590 "thread available") \
1591 range(1, max_uintx) \
1592 \
1593 product(uintx, CMSIncrementalSafetyFactor, 10, \
1594 "Percentage (0-100) used to add conservatism when computing the " \
1595 "duty cycle") \
1596 range(0, 100) \
1597 \
1598 product(uintx, CMSExpAvgFactor, 50, \
1599 "Percentage (0-100) used to weight the current sample when " \
1600 "computing exponential averages for CMS statistics") \
1601 range(0, 100) \
1602 \
1603 product(uintx, CMS_FLSWeight, 75, \
1604 "Percentage (0-100) used to weight the current sample when " \
1605 "computing exponentially decaying averages for CMS FLS " \
1606 "statistics") \
1607 range(0, 100) \
1608 \
1609 product(uintx, CMS_FLSPadding, 1, \
1610 "The multiple of deviation from mean to use for buffering " \
1611 "against volatility in free list demand") \
1612 range(0, max_juint) \
1613 \
1614 product(uintx, FLSCoalescePolicy, 2, \
1615 "CMS: aggressiveness level for coalescing, increasing " \
1616 "from 0 to 4") \
1617 range(0, 4) \
1618 \
1619 product(bool, FLSAlwaysCoalesceLarge, false, \
1620 "CMS: larger free blocks are always available for coalescing") \
1621 \
1622 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1623 "CMS: the smaller the percentage the greater the coalescing " \
1624 "force") \
1625 range(0.0, 1.0) \
1626 \
1627 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1628 "CMS: the factor by which to inflate estimated demand of small " \
1629 "block sizes to prevent coalescing with an adjoining block") \
1630 range(0.0, DBL_MAX) \
1631 \
1632 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1633 "CMS: the factor by which to inflate estimated demand of large " \
1634 "block sizes to prevent coalescing with an adjoining block") \
1635 range(0.0, DBL_MAX) \
1636 \
1637 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1638 "CMS: the factor by which to inflate estimated demand of small " \
1639 "block sizes to prevent splitting to supply demand for smaller " \
1640 "blocks") \
1641 range(0.0, DBL_MAX) \
1642 \
1643 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1644 "CMS: the factor by which to inflate estimated demand of large " \
1645 "block sizes to prevent splitting to supply demand for smaller " \
1646 "blocks") \
1647 range(0.0, DBL_MAX) \
1648 \
1649 product(bool, CMSExtrapolateSweep, false, \
1650 "CMS: cushion for block demand during sweep") \
1651 \
1652 product(uintx, CMS_SweepWeight, 75, \
1653 "Percentage (0-100) used to weight the current sample when " \
1654 "computing exponentially decaying average for inter-sweep " \
1655 "duration") \
1656 range(0, 100) \
1657 \
1658 product(uintx, CMS_SweepPadding, 1, \
1659 "The multiple of deviation from mean to use for buffering " \
1660 "against volatility in inter-sweep duration") \
1661 range(0, max_juint) \
1662 \
1663 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1664 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1665 "duration exceeds this threshold in milliseconds") \
1666 range(0, max_uintx) \
1667 \
1668 product(bool, CMSClassUnloadingEnabled, true, \
1669 "Whether class unloading enabled when using CMS GC") \
1670 \
1671 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1672 "When CMS class unloading is enabled, the maximum CMS cycle " \
1673 "count for which classes may not be unloaded") \
1674 range(0, max_uintx) \
1675 \
1676 product(uintx, CMSIndexedFreeListReplenish, 4, \
1677 "Replenish an indexed free list with this number of chunks") \
1678 range(1, max_uintx) \
1679 \
1680 product(bool, CMSReplenishIntermediate, true, \
1681 "Replenish all intermediate free-list caches") \
1682 \
1683 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1684 "When satisfying batched demand, split blocks from the " \
1685 "IndexedFreeList whose size is a multiple of requested size") \
1686 \
1687 product(bool, CMSLoopWarn, false, \
1688 "Warn in case of excessive CMS looping") \
1689 \
1690 /* where does the range max value of (max_jint - 1) come from? */ \
1691 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1692 "Maximum size of marking stack") \
1693 range(1, (max_jint - 1)) \
1694 \
1695 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1696 "Size of marking stack") \
1697 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1698 \
1699 notproduct(bool, CMSMarkStackOverflowALot, false, \
1700 "Simulate frequent marking stack / work queue overflow") \
1701 \
1702 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1703 "An \"interval\" counter that determines how frequently " \
1704 "to simulate overflow; a smaller number increases frequency") \
1705 \
1706 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1707 "Maximum number of abortable preclean iterations, if > 0") \
1708 range(0, max_uintx) \
1709 \
1710 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1711 "Maximum time in abortable preclean (in milliseconds)") \
1712 range(0, max_intx) \
1713 \
1714 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1715 "Nominal minimum work per abortable preclean iteration") \
1716 range(0, max_uintx) \
1717 \
1718 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1719 "Time that we sleep between iterations when not given " \
1720 "enough work per iteration") \
1721 range(0, max_intx) \
1722 \
1723 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \
1724 product(size_t, CMSRescanMultiple, 32, \
1725 "Size (in cards) of CMS parallel rescan task") \
1726 range(1, SIZE_MAX / 4096) \
1727 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \
1728 \
1729 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \
1730 product(size_t, CMSConcMarkMultiple, 32, \
1731 "Size (in cards) of CMS concurrent MT marking task") \
1732 range(1, SIZE_MAX / 4096) \
1733 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \
1734 \
1735 product(bool, CMSAbortSemantics, false, \
1736 "Whether abort-on-overflow semantics is implemented") \
1737 \
1738 product(bool, CMSParallelInitialMarkEnabled, true, \
1739 "Use the parallel initial mark.") \
1740 \
1741 product(bool, CMSParallelRemarkEnabled, true, \
1742 "Whether parallel remark enabled (only if ParNewGC)") \
1743 \
1744 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1745 "Whether parallel remark of survivor space " \
1746 "enabled (effective only if CMSParallelRemarkEnabled)") \
1747 \
1748 product(bool, CMSPLABRecordAlways, true, \
1749 "Always record survivor space PLAB boundaries (effective only " \
1750 "if CMSParallelSurvivorRemarkEnabled)") \
1751 \
1752 product(bool, CMSEdenChunksRecordAlways, true, \
1753 "Always record eden chunks used for the parallel initial mark " \
1754 "or remark of eden") \
1755 \
1756 product(bool, CMSConcurrentMTEnabled, true, \
1757 "Whether multi-threaded concurrent work enabled " \
1758 "(effective only if ParNewGC)") \
1759 \
1760 product(bool, CMSPrecleaningEnabled, true, \
1761 "Whether concurrent precleaning enabled") \
1762 \
1763 product(uintx, CMSPrecleanIter, 3, \
1764 "Maximum number of precleaning iteration passes") \
1765 range(0, 9) \
1766 \
1767 product(uintx, CMSPrecleanDenominator, 3, \
1768 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1769 "ratio") \
1770 range(1, max_uintx) \
1771 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1772 \
1773 product(uintx, CMSPrecleanNumerator, 2, \
1774 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1775 "ratio") \
1776 range(0, max_uintx-1) \
1777 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1778 \
1779 product(bool, CMSPrecleanRefLists1, true, \
1780 "Preclean ref lists during (initial) preclean phase") \
1781 \
1782 product(bool, CMSPrecleanRefLists2, false, \
1783 "Preclean ref lists during abortable preclean phase") \
1784 \
1785 product(bool, CMSPrecleanSurvivors1, false, \
1786 "Preclean survivors during (initial) preclean phase") \
1787 \
1788 product(bool, CMSPrecleanSurvivors2, true, \
1789 "Preclean survivors during abortable preclean phase") \
1790 \
1791 product(uintx, CMSPrecleanThreshold, 1000, \
1792 "Do not iterate again if number of dirty cards is less than this")\
1793 range(100, max_uintx) \
1794 \
1795 product(bool, CMSCleanOnEnter, true, \
1796 "Clean-on-enter optimization for reducing number of dirty cards") \
1797 \
1798 product(uintx, CMSRemarkVerifyVariant, 1, \
1799 "Choose variant (1,2) of verification following remark") \
1800 range(1, 2) \
1801 \
1802 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1803 "If Eden size is below this, do not try to schedule remark") \
1804 range(0, max_uintx) \
1805 \
1806 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1807 "The Eden occupancy percentage (0-100) at which " \
1808 "to try and schedule remark pause") \
1809 range(0, 100) \
1810 \
1811 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1812 "Start sampling eden top at least before young gen " \
1813 "occupancy reaches 1/<ratio> of the size at which " \
1814 "we plan to schedule remark") \
1815 range(1, max_uintx) \
1816 \
1817 product(uintx, CMSSamplingGrain, 16*K, \
1818 "The minimum distance between eden samples for CMS (see above)") \
1819 range(ObjectAlignmentInBytes, max_uintx) \
1820 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \
1821 \
1822 product(bool, CMSScavengeBeforeRemark, false, \
1823 "Attempt scavenge before the CMS remark step") \
1824 \
1825 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1826 "Don't drain below this size per parallel worker/thief") \
1827 range(1, max_juint) \
1828 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1829 \
1830 manageable(intx, CMSWaitDuration, 2000, \
1831 "Time in milliseconds that CMS thread waits for young GC") \
1832 range(min_jint, max_jint) \
1833 \
1834 develop(uintx, CMSCheckInterval, 1000, \
1835 "Interval in milliseconds that CMS thread checks if it " \
1836 "should start a collection cycle") \
1837 \
1838 product(bool, CMSYield, true, \
1839 "Yield between steps of CMS") \
1840 \
1841 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1842 "Bitmap operations should process at most this many bits " \
1843 "between yields") \
1844 range(1, max_uintx) \
1845 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \
1846 \
1847 product(bool, CMSPrintChunksInDump, false, \
1848 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1849 "trace level include more detailed information about the" \
1850 "free chunks") \
1851 \
1852 product(bool, CMSPrintObjectsInDump, false, \
1853 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1854 "trace level include more detailed information about the" \
1855 "allocated objects") \
1856 \
1857 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1858 "Verify that all references across the FLS boundary " \
1859 "are to valid objects") \
1860 \
1861 diagnostic(bool, FLSVerifyLists, false, \
1862 "Do lots of (expensive) FreeListSpace verification") \
1863 \
1864 diagnostic(bool, FLSVerifyIndexTable, false, \
1865 "Do lots of (expensive) FLS index table verification") \
1866 \
1867 develop(bool, FLSVerifyDictionary, false, \
1868 "Do lots of (expensive) FLS dictionary verification") \
1869 \
1870 develop(bool, VerifyBlockOffsetArray, false, \
1871 "Do (expensive) block offset array verification") \
1872 \
1873 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1874 "Maintain _unallocated_block in BlockOffsetArray " \
1875 "(currently applicable only to CMS collector)") \
1876 \
1877 product(intx, RefDiscoveryPolicy, 0, \
1878 "Select type of reference discovery policy: " \
1879 "reference-based(0) or referent-based(1)") \
1880 range(ReferenceProcessor::DiscoveryPolicyMin, \
1881 ReferenceProcessor::DiscoveryPolicyMax) \
1882 \
1883 product(bool, ParallelRefProcEnabled, false, \
1884 "Enable parallel reference processing whenever possible") \
1885 \
1886 product(bool, ParallelRefProcBalancingEnabled, true, \
1887 "Enable balancing of reference processing queues") \
1888 \
1889 product(uintx, CMSTriggerRatio, 80, \
1890 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1891 "allocated before a CMS collection cycle commences") \
1892 range(0, 100) \
1893 \
1894 product(uintx, CMSBootstrapOccupancy, 50, \
1895 "Percentage CMS generation occupancy at which to " \
1896 "initiate CMS collection for bootstrapping collection stats") \
1897 range(0, 100) \
1898 \
1899 product(intx, CMSInitiatingOccupancyFraction, -1, \
1900 "Percentage CMS generation occupancy to start a CMS collection " \
1901 "cycle. A negative value means that CMSTriggerRatio is used") \
1902 range(min_intx, 100) \
1903 \
1904 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1905 "The percent occupancy (IHOP) of the current old generation " \
1906 "capacity above which a concurrent mark cycle will be initiated " \
1907 "Its value may change over time if adaptive IHOP is enabled, " \
1908 "otherwise the value remains constant. " \
1909 "In the latter case a value of 0 will result as frequent as " \
1910 "possible concurrent marking cycles. A value of 100 disables " \
1911 "concurrent marking. " \
1912 "Fragmentation waste in the old generation is not considered " \
1913 "free space in this calculation. (G1 collector only)") \
1914 range(0, 100) \
1915 \
1916 manageable(intx, CMSTriggerInterval, -1, \
1917 "Commence a CMS collection cycle (at least) every so many " \
1918 "milliseconds (0 permanently, -1 disabled)") \
1919 range(-1, max_intx) \
1920 \
1921 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1922 "Only use occupancy as a criterion for starting a CMS collection")\
1923 \
1924 product(uintx, CMSIsTooFullPercentage, 98, \
1925 "An absolute ceiling above which CMS will always consider the " \
1926 "unloading of classes when class unloading is enabled") \
1927 range(0, 100) \
1928 \
1929 develop(bool, CMSTestInFreeList, false, \
1930 "Check if the coalesced range is already in the " \
1931 "free lists as claimed") \
1932 \
1933 notproduct(bool, CMSVerifyReturnedBytes, false, \
1934 "Check that all the garbage collected was returned to the " \
1935 "free lists") \
1936 \
1937 notproduct(bool, ScavengeALot, false, \
1938 "Force scavenge at every Nth exit from the runtime system " \
1939 "(N=ScavengeALotInterval)") \
1940 \
1941 develop(bool, FullGCALot, false, \
1942 "Force full gc at every Nth exit from the runtime system " \
1943 "(N=FullGCALotInterval)") \
1944 \
1945 notproduct(bool, GCALotAtAllSafepoints, false, \
1946 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1947 \
1948 notproduct(bool, PromotionFailureALot, false, \
1949 "Use promotion failure handling on every youngest generation " \
1950 "collection") \
1951 \
1952 develop(uintx, PromotionFailureALotCount, 1000, \
1953 "Number of promotion failures occurring at PLAB " \
1954 "refill attempts (ParNew) or promotion attempts " \
1955 "(other young collectors)") \
1956 \
1957 develop(uintx, PromotionFailureALotInterval, 5, \
1958 "Total collections between promotion failures a lot") \
1959 \
1960 experimental(uintx, WorkStealingSleepMillis, 1, \
1961 "Sleep time when sleep is used for yields") \
1962 \
1963 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1964 "Number of yields before a sleep is done during work stealing") \
1965 \
1966 experimental(uintx, WorkStealingHardSpins, 4096, \
1967 "Number of iterations in a spin loop between checks on " \
1968 "time out of hard spin") \
1969 \
1970 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1971 "Ratio of hard spins to calls to yield") \
1972 \
1973 develop(uintx, ObjArrayMarkingStride, 2048, \
1974 "Number of object array elements to push onto the marking stack " \
1975 "before pushing a continuation entry") \
1976 \
1977 develop(bool, MetadataAllocationFailALot, false, \
1978 "Fail metadata allocations at intervals controlled by " \
1979 "MetadataAllocationFailALotInterval") \
1980 \
1981 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1982 "Metadata allocation failure a lot interval") \
1983 \
1984 notproduct(bool, ExecuteInternalVMTests, false, \
1985 "Enable execution of internal VM tests") \
1986 \
1987 notproduct(bool, VerboseInternalVMTests, false, \
1988 "Turn on logging for internal VM tests.") \
1989 \
1990 product(bool, ExecutingUnitTests, false, \
1991 "Whether the JVM is running unit tests or not") \
1992 \
1993 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1994 \
1995 product_pd(bool, ResizeTLAB, \
1996 "Dynamically resize TLAB size for threads") \
1997 \
1998 product(bool, ZeroTLAB, false, \
1999 "Zero out the newly created TLAB") \
2000 \
2001 product(bool, TLABStats, true, \
2002 "Provide more detailed and expensive TLAB statistics.") \
2003 \
2004 product_pd(bool, NeverActAsServerClassMachine, \
2005 "Never act like a server-class machine") \
2006 \
2007 product(bool, AlwaysActAsServerClassMachine, false, \
2008 "Always act like a server-class machine") \
2009 \
2010 product_pd(uint64_t, MaxRAM, \
2011 "Real memory size (in bytes) used to set maximum heap size") \
2012 range(0, 0XFFFFFFFFFFFFFFFF) \
2013 \
2014 product(bool, AggressiveHeap, false, \
2015 "Optimize heap options for long-running memory intensive apps") \
2016 \
2017 product(size_t, ErgoHeapSizeLimit, 0, \
2018 "Maximum ergonomically set heap size (in bytes); zero means use " \
2019 "MaxRAM * MaxRAMPercentage / 100") \
2020 range(0, max_uintx) \
2021 \
2022 product(uintx, MaxRAMFraction, 4, \
2023 "Maximum fraction (1/n) of real memory used for maximum heap " \
2024 "size. " \
2025 "Deprecated, use MaxRAMPercentage instead") \
2026 range(1, max_uintx) \
2027 \
2028 product(uintx, MinRAMFraction, 2, \
2029 "Minimum fraction (1/n) of real memory used for maximum heap " \
2030 "size on systems with small physical memory size. " \
2031 "Deprecated, use MinRAMPercentage instead") \
2032 range(1, max_uintx) \
2033 \
2034 product(uintx, InitialRAMFraction, 64, \
2035 "Fraction (1/n) of real memory used for initial heap size. " \
2036 "Deprecated, use InitialRAMPercentage instead") \
2037 range(1, max_uintx) \
2038 \
2039 product(double, MaxRAMPercentage, 25.0, \
2040 "Maximum percentage of real memory used for maximum heap size") \
2041 range(0.0, 100.0) \
2042 \
2043 product(double, MinRAMPercentage, 50.0, \
2044 "Minimum percentage of real memory used for maximum heap" \
2045 "size on systems with small physical memory size") \
2046 range(0.0, 100.0) \
2047 \
2048 product(double, InitialRAMPercentage, 1.5625, \
2049 "Percentage of real memory used for initial heap size") \
2050 range(0.0, 100.0) \
2051 \
2052 product(int, ActiveProcessorCount, -1, \
2053 "Specify the CPU count the VM should use and report as active") \
2054 \
2055 develop(uintx, MaxVirtMemFraction, 2, \
2056 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2057 "determining maximum heap size") \
2058 \
2059 product(bool, UseAdaptiveSizePolicy, true, \
2060 "Use adaptive generation sizing policies") \
2061 \
2062 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2063 "Use adaptive survivor sizing policies") \
2064 \
2065 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2066 "Use adaptive young-old sizing policies at minor collections") \
2067 \
2068 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2069 "Use adaptive young-old sizing policies at major collections") \
2070 \
2071 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2072 "Include statistics from System.gc() for adaptive size policy") \
2073 \
2074 product(bool, UseAdaptiveGCBoundary, false, \
2075 "Allow young-old boundary to move") \
2076 \
2077 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2078 "Resize the virtual spaces of the young or old generations") \
2079 range(-1, 1) \
2080 \
2081 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2082 "Policy for changing generation size for throughput goals") \
2083 range(0, 1) \
2084 \
2085 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2086 "Number of steps where heuristics is used before data is used") \
2087 range(0, max_uintx) \
2088 \
2089 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2090 "Number of collections before the adaptive sizing is started") \
2091 \
2092 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2093 "Collection interval for printing information; zero means never") \
2094 range(0, max_uintx) \
2095 \
2096 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2097 "Use adaptive minimum footprint as a goal") \
2098 \
2099 product(uintx, AdaptiveSizePolicyWeight, 10, \
2100 "Weight given to exponential resizing, between 0 and 100") \
2101 range(0, 100) \
2102 \
2103 product(uintx, AdaptiveTimeWeight, 25, \
2104 "Weight given to time in adaptive policy, between 0 and 100") \
2105 range(0, 100) \
2106 \
2107 product(uintx, PausePadding, 1, \
2108 "How much buffer to keep for pause time") \
2109 range(0, max_juint) \
2110 \
2111 product(uintx, PromotedPadding, 3, \
2112 "How much buffer to keep for promotion failure") \
2113 range(0, max_juint) \
2114 \
2115 product(uintx, SurvivorPadding, 3, \
2116 "How much buffer to keep for survivor overflow") \
2117 range(0, max_juint) \
2118 \
2119 product(uintx, ThresholdTolerance, 10, \
2120 "Allowed collection cost difference between generations") \
2121 range(0, 100) \
2122 \
2123 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2124 "If collection costs are within margin, reduce both by full " \
2125 "delta") \
2126 range(0, 100) \
2127 \
2128 product(uintx, YoungGenerationSizeIncrement, 20, \
2129 "Adaptive size percentage change in young generation") \
2130 range(0, 100) \
2131 \
2132 product(uintx, YoungGenerationSizeSupplement, 80, \
2133 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2134 range(0, 100) \
2135 \
2136 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2137 "Decay factor to YoungedGenerationSizeSupplement") \
2138 range(1, max_uintx) \
2139 \
2140 product(uintx, TenuredGenerationSizeIncrement, 20, \
2141 "Adaptive size percentage change in tenured generation") \
2142 range(0, 100) \
2143 \
2144 product(uintx, TenuredGenerationSizeSupplement, 80, \
2145 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2146 range(0, 100) \
2147 \
2148 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2149 "Decay factor to TenuredGenerationSizeIncrement") \
2150 range(1, max_uintx) \
2151 \
2152 product(uintx, MaxGCPauseMillis, max_uintx - 1, \
2153 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2154 "or (G1 Only) the maximum GC time per MMU time slice") \
2155 range(1, max_uintx - 1) \
2156 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2157 \
2158 product(uintx, GCPauseIntervalMillis, 0, \
2159 "Time slice for MMU specification") \
2160 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2161 \
2162 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2163 "Adaptive size policy maximum GC minor pause time goal " \
2164 "in millisecond") \
2165 range(0, max_uintx) \
2166 \
2167 product(uintx, GCTimeRatio, 99, \
2168 "Adaptive size policy application time to GC time ratio") \
2169 range(0, max_juint) \
2170 \
2171 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2172 "Adaptive size scale down factor for shrinking") \
2173 range(1, max_uintx) \
2174 \
2175 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2176 "Adaptive size decays the major cost for long major intervals") \
2177 \
2178 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2179 "Time scale over which major costs decay") \
2180 range(0, max_uintx) \
2181 \
2182 product(uintx, MinSurvivorRatio, 3, \
2183 "Minimum ratio of young generation/survivor space size") \
2184 range(3, max_uintx) \
2185 \
2186 product(uintx, InitialSurvivorRatio, 8, \
2187 "Initial ratio of young generation/survivor space size") \
2188 range(0, max_uintx) \
2189 \
2190 product(size_t, BaseFootPrintEstimate, 256*M, \
2191 "Estimate of footprint other than Java Heap") \
2192 range(0, max_uintx) \
2193 \
2194 product(bool, UseGCOverheadLimit, true, \
2195 "Use policy to limit of proportion of time spent in GC " \
2196 "before an OutOfMemory error is thrown") \
2197 \
2198 product(uintx, GCTimeLimit, 98, \
2199 "Limit of the proportion of time spent in GC before " \
2200 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2201 range(0, 100) \
2202 \
2203 product(uintx, GCHeapFreeLimit, 2, \
2204 "Minimum percentage of free space after a full GC before an " \
2205 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2206 range(0, 100) \
2207 \
2208 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2209 "Number of consecutive collections before gc time limit fires") \
2210 range(1, max_uintx) \
2211 \
2212 product(intx, PrefetchCopyIntervalInBytes, -1, \
2213 "How far ahead to prefetch destination area (<= 0 means off)") \
2214 range(-1, max_jint) \
2215 \
2216 product(intx, PrefetchScanIntervalInBytes, -1, \
2217 "How far ahead to prefetch scan area (<= 0 means off)") \
2218 range(-1, max_jint) \
2219 \
2220 product(intx, PrefetchFieldsAhead, -1, \
2221 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2222 range(-1, max_jint) \
2223 \
2224 diagnostic(bool, VerifyDuringStartup, false, \
2225 "Verify memory system before executing any Java code " \
2226 "during VM initialization") \
2227 \
2228 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2229 "Verify system before exiting") \
2230 \
2231 diagnostic(bool, VerifyBeforeGC, false, \
2232 "Verify memory system before GC") \
2233 \
2234 diagnostic(bool, VerifyAfterGC, false, \
2235 "Verify memory system after GC") \
2236 \
2237 diagnostic(bool, VerifyDuringGC, false, \
2238 "Verify memory system during GC (between phases)") \
2239 \
2240 diagnostic(ccstrlist, VerifyGCType, "", \
2241 "GC type(s) to verify when Verify*GC is enabled." \
2242 "Available types are collector specific.") \
2243 \
2244 diagnostic(ccstrlist, VerifySubSet, "", \
2245 "Memory sub-systems to verify when Verify*GC flag(s) " \
2246 "are enabled. One or more sub-systems can be specified " \
2247 "in a comma separated string. Sub-systems are: " \
2248 "threads, heap, symbol_table, string_table, codecache, " \
2249 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2250 "codecache_oops") \
2251 \
2252 diagnostic(bool, GCParallelVerificationEnabled, true, \
2253 "Enable parallel memory system verification") \
2254 \
2255 diagnostic(bool, DeferInitialCardMark, false, \
2256 "When +ReduceInitialCardMarks, explicitly defer any that " \
2257 "may arise from new_pre_store_barrier") \
2258 \
2259 product(bool, UseCondCardMark, false, \
2260 "Check for already marked card before updating card table") \
2261 \
2262 diagnostic(bool, VerifyRememberedSets, false, \
2263 "Verify GC remembered sets") \
2264 \
2265 diagnostic(bool, VerifyObjectStartArray, true, \
2266 "Verify GC object start array if verify before/after") \
2267 \
2268 product(bool, DisableExplicitGC, false, \
2269 "Ignore calls to System.gc()") \
2270 \
2271 notproduct(bool, CheckMemoryInitialization, false, \
2272 "Check memory initialization") \
2273 \
2274 diagnostic(bool, BindCMSThreadToCPU, false, \
2275 "Bind CMS Thread to CPU if possible") \
2276 \
2277 diagnostic(uintx, CPUForCMSThread, 0, \
2278 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2279 range(0, max_juint) \
2280 \
2281 product(bool, BindGCTaskThreadsToCPUs, false, \
2282 "Bind GCTaskThreads to CPUs if possible") \
2283 \
2284 product(bool, UseGCTaskAffinity, false, \
2285 "Use worker affinity when asking for GCTasks") \
2286 \
2287 product(uintx, ProcessDistributionStride, 4, \
2288 "Stride through processors when distributing processes") \
2289 range(0, max_juint) \
2290 \
2291 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2292 "Number of times the coordinator GC thread will sleep while " \
2293 "yielding before giving up and resuming GC") \
2294 range(0, max_juint) \
2295 \
2296 product(uintx, CMSYieldSleepCount, 0, \
2297 "Number of times a GC thread (minus the coordinator) " \
2298 "will sleep while yielding before giving up and resuming GC") \
2299 range(0, max_juint) \
2300 \
2301 product(bool, PrintGC, false, \
2302 "Print message at garbage collection. " \
2303 "Deprecated, use -Xlog:gc instead.") \
2304 \
2305 product(bool, PrintGCDetails, false, \
2306 "Print more details at garbage collection. " \
2307 "Deprecated, use -Xlog:gc* instead.") \
2308 \
2309 develop(intx, ConcGCYieldTimeout, 0, \
2310 "If non-zero, assert that GC threads yield within this " \
2311 "number of milliseconds") \
2312 range(0, max_intx) \
2313 \
2314 develop(bool, TraceFinalizerRegistration, false, \
2315 "Trace registration of final references") \
2316 \
2317 notproduct(bool, TraceScavenge, false, \
2318 "Trace scavenge") \
2319 \
2320 product(bool, IgnoreEmptyClassPaths, false, \
2321 "Ignore empty path elements in -classpath") \
2322 \
2323 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2324 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2325 "Initial size of the boot class loader data metaspace") \
2326 range(30*K, max_uintx/BytesPerWord) \
2327 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2328 \
2329 product(bool, PrintHeapAtSIGBREAK, true, \
2330 "Print heap layout in response to SIGBREAK") \
2331 \
2332 manageable(bool, PrintClassHistogram, false, \
2333 "Print a histogram of class instances") \
2334 \
2335 develop(bool, TraceGCTaskManager, false, \
2336 "Trace actions of the GC task manager") \
2337 \
2338 develop(bool, TraceGCTaskQueue, false, \
2339 "Trace actions of the GC task queues") \
2340 \
2341 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2342 "Trace marking phase in ParallelOldGC") \
2343 \
2344 develop(bool, TraceParallelOldGCDensePrefix, false, \
2345 "Trace dense prefix computation for ParallelOldGC") \
2346 \
2347 develop(bool, IgnoreLibthreadGPFault, false, \
2348 "Suppress workaround for libthread GP fault") \
2349 \
2350 experimental(double, ObjectCountCutOffPercent, 0.5, \
2351 "The percentage of the used heap that the instances of a class " \
2352 "must occupy for the class to generate a trace event") \
2353 range(0.0, 100.0) \
2354 \
2355 /* JVMTI heap profiling */ \
2356 \
2357 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2358 "Trace JVMTI object tagging calls") \
2359 \
2360 diagnostic(bool, VerifyBeforeIteration, false, \
2361 "Verify memory system before JVMTI iteration") \
2362 \
2363 /* compiler interface */ \
2364 \
2365 develop(bool, CIPrintCompilerName, false, \
2366 "when CIPrint is active, print the name of the active compiler") \
2367 \
2368 diagnostic(bool, CIPrintCompileQueue, false, \
2369 "display the contents of the compile queue whenever a " \
2370 "compilation is enqueued") \
2371 \
2372 develop(bool, CIPrintRequests, false, \
2373 "display every request for compilation") \
2374 \
2375 product(bool, CITime, false, \
2376 "collect timing information for compilation") \
2377 \
2378 develop(bool, CITimeVerbose, false, \
2379 "be more verbose in compilation timings") \
2380 \
2381 develop(bool, CITimeEach, false, \
2382 "display timing information after each successful compilation") \
2383 \
2384 develop(bool, CICountOSR, false, \
2385 "use a separate counter when assigning ids to osr compilations") \
2386 \
2387 develop(bool, CICompileNatives, true, \
2388 "compile native methods if supported by the compiler") \
2389 \
2390 develop_pd(bool, CICompileOSR, \
2391 "compile on stack replacement methods if supported by the " \
2392 "compiler") \
2393 \
2394 develop(bool, CIPrintMethodCodes, false, \
2395 "print method bytecodes of the compiled code") \
2396 \
2397 develop(bool, CIPrintTypeFlow, false, \
2398 "print the results of ciTypeFlow analysis") \
2399 \
2400 develop(bool, CITraceTypeFlow, false, \
2401 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2402 \
2403 develop(intx, OSROnlyBCI, -1, \
2404 "OSR only at this bci. Negative values mean exclude that bci") \
2405 \
2406 /* compiler */ \
2407 \
2408 /* notice: the max range value here is max_jint, not max_intx */ \
2409 /* because of overflow issue */ \
2410 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2411 "Number of compiler threads to run") \
2412 range(0, max_jint) \
2413 constraint(CICompilerCountConstraintFunc, AfterErgo) \
2414 \
2415 product(intx, CompilationPolicyChoice, 0, \
2416 "which compilation policy (0-3)") \
2417 range(0, 3) \
2418 \
2419 develop(bool, UseStackBanging, true, \
2420 "use stack banging for stack overflow checks (required for " \
2421 "proper StackOverflow handling; disable only to measure cost " \
2422 "of stackbanging)") \
2423 \
2424 develop(bool, UseStrictFP, true, \
2425 "use strict fp if modifier strictfp is set") \
2426 \
2427 develop(bool, GenerateSynchronizationCode, true, \
2428 "generate locking/unlocking code for synchronized methods and " \
2429 "monitors") \
2430 \
2431 develop(bool, GenerateRangeChecks, true, \
2432 "Generate range checks for array accesses") \
2433 \
2434 diagnostic_pd(bool, ImplicitNullChecks, \
2435 "Generate code for implicit null checks") \
2436 \
2437 product_pd(bool, TrapBasedNullChecks, \
2438 "Generate code for null checks that uses a cmp and trap " \
2439 "instruction raising SIGTRAP. This is only used if an access to" \
2440 "null (+offset) will not raise a SIGSEGV, i.e.," \
2441 "ImplicitNullChecks don't work (PPC64).") \
2442 \
2443 product(bool, PrintSafepointStatistics, false, \
2444 "(Deprecated) Print statistics about safepoint synchronization") \
2445 \
2446 product(intx, PrintSafepointStatisticsCount, 300, \
2447 "(Deprecated) Total number of safepoint statistics collected " \
2448 "before printing them out") \
2449 range(1, max_intx) \
2450 \
2451 product(intx, PrintSafepointStatisticsTimeout, -1, \
2452 "(Deprecated) Print safepoint statistics only when safepoint takes " \
2453 "more than PrintSafepointSatisticsTimeout in millis") \
2454 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2455 NOT_LP64(range(-1, max_intx)) \
2456 \
2457 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \
2458 "Enable Thread SMR extra validity checks") \
2459 \
2460 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \
2461 "Enable Thread SMR Statistics") \
2462 \
2463 product(bool, Inline, true, \
2464 "Enable inlining") \
2465 \
2466 product(bool, ClipInlining, true, \
2467 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2468 \
2469 develop(bool, UseCHA, true, \
2470 "Enable CHA") \
2471 \
2472 product(bool, UseTypeProfile, true, \
2473 "Check interpreter profile for historically monomorphic calls") \
2474 \
2475 diagnostic(bool, PrintInlining, false, \
2476 "Print inlining optimizations") \
2477 \
2478 product(bool, UsePopCountInstruction, false, \
2479 "Use population count instruction") \
2480 \
2481 develop(bool, EagerInitialization, false, \
2482 "Eagerly initialize classes if possible") \
2483 \
2484 diagnostic(bool, LogTouchedMethods, false, \
2485 "Log methods which have been ever touched in runtime") \
2486 \
2487 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2488 "Print all methods that have been ever touched in runtime") \
2489 \
2490 develop(bool, TraceMethodReplacement, false, \
2491 "Print when methods are replaced do to recompilation") \
2492 \
2493 develop(bool, PrintMethodFlushing, false, \
2494 "Print the nmethods being flushed") \
2495 \
2496 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2497 "print statistics about method flushing") \
2498 \
2499 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2500 "Number of compiled code invocations after which " \
2501 "the method is considered as hot by the flusher") \
2502 range(1, max_jint) \
2503 \
2504 diagnostic(intx, MinPassesBeforeFlush, 10, \
2505 "Minimum number of sweeper passes before an nmethod " \
2506 "can be flushed") \
2507 range(0, max_intx) \
2508 \
2509 product(bool, UseCodeAging, true, \
2510 "Insert counter to detect warm methods") \
2511 \
2512 diagnostic(bool, StressCodeAging, false, \
2513 "Start with counters compiled in") \
2514 \
2515 develop(bool, StressCodeBuffers, false, \
2516 "Exercise code buffer expansion and other rare state changes") \
2517 \
2518 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2519 "Generate extra debugging information for non-safepoints in " \
2520 "nmethods") \
2521 \
2522 product(bool, PrintVMOptions, false, \
2523 "Print flags that appeared on the command line") \
2524 \
2525 product(bool, IgnoreUnrecognizedVMOptions, false, \
2526 "Ignore unrecognized VM options") \
2527 \
2528 product(bool, PrintCommandLineFlags, false, \
2529 "Print flags specified on command line or set by ergonomics") \
2530 \
2531 product(bool, PrintFlagsInitial, false, \
2532 "Print all VM flags before argument processing and exit VM") \
2533 \
2534 product(bool, PrintFlagsFinal, false, \
2535 "Print all VM flags after argument and ergonomic processing") \
2536 \
2537 notproduct(bool, PrintFlagsWithComments, false, \
2538 "Print all VM flags with default values and descriptions and " \
2539 "exit") \
2540 \
2541 product(bool, PrintFlagsRanges, false, \
2542 "Print VM flags and their ranges and exit VM") \
2543 \
2544 diagnostic(bool, SerializeVMOutput, true, \
2545 "Use a mutex to serialize output to tty and LogFile") \
2546 \
2547 diagnostic(bool, DisplayVMOutput, true, \
2548 "Display all VM output on the tty, independently of LogVMOutput") \
2549 \
2550 diagnostic(bool, LogVMOutput, false, \
2551 "Save VM output to LogFile") \
2552 \
2553 diagnostic(ccstr, LogFile, NULL, \
2554 "If LogVMOutput or LogCompilation is on, save VM output to " \
2555 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2556 \
2557 product(ccstr, ErrorFile, NULL, \
2558 "If an error occurs, save the error data to this file " \
2559 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2560 \
2561 product(bool, DisplayVMOutputToStderr, false, \
2562 "If DisplayVMOutput is true, display all VM output to stderr") \
2563 \
2564 product(bool, DisplayVMOutputToStdout, false, \
2565 "If DisplayVMOutput is true, display all VM output to stdout") \
2566 \
2567 product(bool, UseHeavyMonitors, false, \
2568 "use heavyweight instead of lightweight Java monitors") \
2569 \
2570 product(bool, PrintStringTableStatistics, false, \
2571 "print statistics about the StringTable and SymbolTable") \
2572 \
2573 diagnostic(bool, VerifyStringTableAtExit, false, \
2574 "verify StringTable contents at exit") \
2575 \
2576 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2577 "print histogram of the symbol table") \
2578 \
2579 notproduct(bool, ExitVMOnVerifyError, false, \
2580 "standard exit from VM if bytecode verify error " \
2581 "(only in debug mode)") \
2582 \
2583 diagnostic(ccstr, AbortVMOnException, NULL, \
2584 "Call fatal if this exception is thrown. Example: " \
2585 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2586 \
2587 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2588 "Call fatal if the exception pointed by AbortVMOnException " \
2589 "has this message") \
2590 \
2591 develop(bool, DebugVtables, false, \
2592 "add debugging code to vtable dispatch") \
2593 \
2594 notproduct(bool, PrintVtableStats, false, \
2595 "print vtables stats at end of run") \
2596 \
2597 develop(bool, TraceCreateZombies, false, \
2598 "trace creation of zombie nmethods") \
2599 \
2600 notproduct(bool, IgnoreLockingAssertions, false, \
2601 "disable locking assertions (for speed)") \
2602 \
2603 product(bool, RangeCheckElimination, true, \
2604 "Eliminate range checks") \
2605 \
2606 develop_pd(bool, UncommonNullCast, \
2607 "track occurrences of null in casts; adjust compiler tactics") \
2608 \
2609 develop(bool, TypeProfileCasts, true, \
2610 "treat casts like calls for purposes of type profiling") \
2611 \
2612 develop(bool, DelayCompilationDuringStartup, true, \
2613 "Delay invoking the compiler until main application class is " \
2614 "loaded") \
2615 \
2616 develop(bool, CompileTheWorld, false, \
2617 "Compile all methods in all classes in bootstrap class path " \
2618 "(stress test)") \
2619 \
2620 develop(bool, CompileTheWorldPreloadClasses, true, \
2621 "Preload all classes used by a class before start loading") \
2622 \
2623 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2624 "Force a safepoint every n compiles so sweeper can keep up") \
2625 \
2626 develop(bool, FillDelaySlots, true, \
2627 "Fill delay slots (on SPARC only)") \
2628 \
2629 develop(bool, TimeLivenessAnalysis, false, \
2630 "Time computation of bytecode liveness analysis") \
2631 \
2632 develop(bool, TraceLivenessGen, false, \
2633 "Trace the generation of liveness analysis information") \
2634 \
2635 notproduct(bool, TraceLivenessQuery, false, \
2636 "Trace queries of liveness analysis information") \
2637 \
2638 notproduct(bool, CollectIndexSetStatistics, false, \
2639 "Collect information about IndexSets") \
2640 \
2641 develop(bool, UseLoopSafepoints, true, \
2642 "Generate Safepoint nodes in every loop") \
2643 \
2644 develop(intx, FastAllocateSizeLimit, 128*K, \
2645 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2646 "Inline allocations larger than this in doublewords must go slow")\
2647 \
2648 product(bool, AggressiveOpts, false, \
2649 "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \
2650 \
2651 product_pd(bool, CompactStrings, \
2652 "Enable Strings to use single byte chars in backing store") \
2653 \
2654 product_pd(uintx, TypeProfileLevel, \
2655 "=XYZ, with Z: Type profiling of arguments at call; " \
2656 "Y: Type profiling of return value at call; " \
2657 "X: Type profiling of parameters to methods; " \
2658 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2659 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2660 \
2661 product(intx, TypeProfileArgsLimit, 2, \
2662 "max number of call arguments to consider for type profiling") \
2663 range(0, 16) \
2664 \
2665 product(intx, TypeProfileParmsLimit, 2, \
2666 "max number of incoming parameters to consider for type profiling"\
2667 ", -1 for all") \
2668 range(-1, 64) \
2669 \
2670 /* statistics */ \
2671 develop(bool, CountCompiledCalls, false, \
2672 "Count method invocations") \
2673 \
2674 notproduct(bool, CountRuntimeCalls, false, \
2675 "Count VM runtime calls") \
2676 \
2677 develop(bool, CountJNICalls, false, \
2678 "Count jni method invocations") \
2679 \
2680 notproduct(bool, CountJVMCalls, false, \
2681 "Count jvm method invocations") \
2682 \
2683 notproduct(bool, CountRemovableExceptions, false, \
2684 "Count exceptions that could be replaced by branches due to " \
2685 "inlining") \
2686 \
2687 notproduct(bool, ICMissHistogram, false, \
2688 "Produce histogram of IC misses") \
2689 \
2690 /* interpreter */ \
2691 product_pd(bool, RewriteBytecodes, \
2692 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2693 \
2694 product_pd(bool, RewriteFrequentPairs, \
2695 "Rewrite frequently used bytecode pairs into a single bytecode") \
2696 \
2697 diagnostic(bool, PrintInterpreter, false, \
2698 "Print the generated interpreter code") \
2699 \
2700 product(bool, UseInterpreter, true, \
2701 "Use interpreter for non-compiled methods") \
2702 \
2703 develop(bool, UseFastSignatureHandlers, true, \
2704 "Use fast signature handlers for native calls") \
2705 \
2706 product(bool, UseLoopCounter, true, \
2707 "Increment invocation counter on backward branch") \
2708 \
2709 product_pd(bool, UseOnStackReplacement, \
2710 "Use on stack replacement, calls runtime if invoc. counter " \
2711 "overflows in loop") \
2712 \
2713 notproduct(bool, TraceOnStackReplacement, false, \
2714 "Trace on stack replacement") \
2715 \
2716 product_pd(bool, PreferInterpreterNativeStubs, \
2717 "Use always interpreter stubs for native methods invoked via " \
2718 "interpreter") \
2719 \
2720 develop(bool, CountBytecodes, false, \
2721 "Count number of bytecodes executed") \
2722 \
2723 develop(bool, PrintBytecodeHistogram, false, \
2724 "Print histogram of the executed bytecodes") \
2725 \
2726 develop(bool, PrintBytecodePairHistogram, false, \
2727 "Print histogram of the executed bytecode pairs") \
2728 \
2729 diagnostic(bool, PrintSignatureHandlers, false, \
2730 "Print code generated for native method signature handlers") \
2731 \
2732 develop(bool, VerifyOops, false, \
2733 "Do plausibility checks for oops") \
2734 \
2735 develop(bool, CheckUnhandledOops, false, \
2736 "Check for unhandled oops in VM code") \
2737 \
2738 develop(bool, VerifyJNIFields, trueInDebug, \
2739 "Verify jfieldIDs for instance fields") \
2740 \
2741 notproduct(bool, VerifyJNIEnvThread, false, \
2742 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2743 "from JNI") \
2744 \
2745 develop(bool, VerifyFPU, false, \
2746 "Verify FPU state (check for NaN's, etc.)") \
2747 \
2748 develop(bool, VerifyThread, false, \
2749 "Watch the thread register for corruption (SPARC only)") \
2750 \
2751 develop(bool, VerifyActivationFrameSize, false, \
2752 "Verify that activation frame didn't become smaller than its " \
2753 "minimal size") \
2754 \
2755 develop(bool, TraceFrequencyInlining, false, \
2756 "Trace frequency based inlining") \
2757 \
2758 develop_pd(bool, InlineIntrinsics, \
2759 "Inline intrinsics that can be statically resolved") \
2760 \
2761 product_pd(bool, ProfileInterpreter, \
2762 "Profile at the bytecode level during interpretation") \
2763 \
2764 develop(bool, TraceProfileInterpreter, false, \
2765 "Trace profiling at the bytecode level during interpretation. " \
2766 "This outputs the profiling information collected to improve " \
2767 "jit compilation.") \
2768 \
2769 develop_pd(bool, ProfileTraps, \
2770 "Profile deoptimization traps at the bytecode level") \
2771 \
2772 product(intx, ProfileMaturityPercentage, 20, \
2773 "number of method invocations/branches (expressed as % of " \
2774 "CompileThreshold) before using the method's profile") \
2775 range(0, 100) \
2776 \
2777 diagnostic(bool, PrintMethodData, false, \
2778 "Print the results of +ProfileInterpreter at end of run") \
2779 \
2780 develop(bool, VerifyDataPointer, trueInDebug, \
2781 "Verify the method data pointer during interpreter profiling") \
2782 \
2783 develop(bool, VerifyCompiledCode, false, \
2784 "Include miscellaneous runtime verifications in nmethod code; " \
2785 "default off because it disturbs nmethod size heuristics") \
2786 \
2787 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2788 "Manually make GC thread crash then dump java stack trace; " \
2789 "Test only") \
2790 \
2791 /* compilation */ \
2792 product(bool, UseCompiler, true, \
2793 "Use Just-In-Time compilation") \
2794 \
2795 develop(bool, TraceCompilationPolicy, false, \
2796 "Trace compilation policy") \
2797 \
2798 develop(bool, TimeCompilationPolicy, false, \
2799 "Time the compilation policy") \
2800 \
2801 product(bool, UseCounterDecay, true, \
2802 "Adjust recompilation counters") \
2803 \
2804 develop(intx, CounterHalfLifeTime, 30, \
2805 "Half-life time of invocation counters (in seconds)") \
2806 \
2807 develop(intx, CounterDecayMinIntervalLength, 500, \
2808 "The minimum interval (in milliseconds) between invocation of " \
2809 "CounterDecay") \
2810 \
2811 product(bool, AlwaysCompileLoopMethods, false, \
2812 "When using recompilation, never interpret methods " \
2813 "containing loops") \
2814 \
2815 product(bool, DontCompileHugeMethods, true, \
2816 "Do not compile methods > HugeMethodLimit") \
2817 \
2818 /* Bytecode escape analysis estimation. */ \
2819 product(bool, EstimateArgEscape, true, \
2820 "Analyze bytecodes to estimate escape state of arguments") \
2821 \
2822 product(intx, BCEATraceLevel, 0, \
2823 "How much tracing to do of bytecode escape analysis estimates " \
2824 "(0-3)") \
2825 range(0, 3) \
2826 \
2827 product(intx, MaxBCEAEstimateLevel, 5, \
2828 "Maximum number of nested calls that are analyzed by BC EA") \
2829 range(0, max_jint) \
2830 \
2831 product(intx, MaxBCEAEstimateSize, 150, \
2832 "Maximum bytecode size of a method to be analyzed by BC EA") \
2833 range(0, max_jint) \
2834 \
2835 product(intx, AllocatePrefetchStyle, 1, \
2836 "0 = no prefetch, " \
2837 "1 = generate prefetch instructions for each allocation, " \
2838 "2 = use TLAB watermark to gate allocation prefetch, " \
2839 "3 = generate one prefetch instruction per cache line") \
2840 range(0, 3) \
2841 \
2842 product(intx, AllocatePrefetchDistance, -1, \
2843 "Distance to prefetch ahead of allocation pointer. " \
2844 "-1: use system-specific value (automatically determined") \
2845 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2846 \
2847 product(intx, AllocatePrefetchLines, 3, \
2848 "Number of lines to prefetch ahead of array allocation pointer") \
2849 range(1, 64) \
2850 \
2851 product(intx, AllocateInstancePrefetchLines, 1, \
2852 "Number of lines to prefetch ahead of instance allocation " \
2853 "pointer") \
2854 range(1, 64) \
2855 \
2856 product(intx, AllocatePrefetchStepSize, 16, \
2857 "Step size in bytes of sequential prefetch instructions") \
2858 range(1, 512) \
2859 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2860 \
2861 product(intx, AllocatePrefetchInstr, 0, \
2862 "Select instruction to prefetch ahead of allocation pointer") \
2863 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
2864 \
2865 /* deoptimization */ \
2866 develop(bool, TraceDeoptimization, false, \
2867 "Trace deoptimization") \
2868 \
2869 develop(bool, PrintDeoptimizationDetails, false, \
2870 "Print more information about deoptimization") \
2871 \
2872 develop(bool, DebugDeoptimization, false, \
2873 "Tracing various information while debugging deoptimization") \
2874 \
2875 product(intx, SelfDestructTimer, 0, \
2876 "Will cause VM to terminate after a given time (in minutes) " \
2877 "(0 means off)") \
2878 range(0, max_intx) \
2879 \
2880 product(intx, MaxJavaStackTraceDepth, 1024, \
2881 "The maximum number of lines in the stack trace for Java " \
2882 "exceptions (0 means all)") \
2883 range(0, max_jint/2) \
2884 \
2885 /* notice: the max range value here is max_jint, not max_intx */ \
2886 /* because of overflow issue */ \
2887 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2888 "Guarantee a safepoint (at least) every so many milliseconds " \
2889 "(0 means none)") \
2890 range(0, max_jint) \
2891 \
2892 product(intx, SafepointTimeoutDelay, 10000, \
2893 "Delay in milliseconds for option SafepointTimeout") \
2894 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
2895 NOT_LP64(range(0, max_intx)) \
2896 \
2897 product(intx, NmethodSweepActivity, 10, \
2898 "Removes cold nmethods from code cache if > 0. Higher values " \
2899 "result in more aggressive sweeping") \
2900 range(0, 2000) \
2901 \
2902 notproduct(bool, LogSweeper, false, \
2903 "Keep a ring buffer of sweeper activity") \
2904 \
2905 notproduct(intx, SweeperLogEntries, 1024, \
2906 "Number of records in the ring buffer of sweeper activity") \
2907 \
2908 notproduct(intx, MemProfilingInterval, 500, \
2909 "Time between each invocation of the MemProfiler") \
2910 \
2911 develop(intx, MallocCatchPtr, -1, \
2912 "Hit breakpoint when mallocing/freeing this pointer") \
2913 \
2914 notproduct(ccstrlist, SuppressErrorAt, "", \
2915 "List of assertions (file:line) to muzzle") \
2916 \
2917 develop(intx, StackPrintLimit, 100, \
2918 "number of stack frames to print in VM-level stack dump") \
2919 \
2920 notproduct(intx, MaxElementPrintSize, 256, \
2921 "maximum number of elements to print") \
2922 \
2923 notproduct(intx, MaxSubklassPrintSize, 4, \
2924 "maximum number of subklasses to print when printing klass") \
2925 \
2926 product(intx, MaxInlineLevel, 9, \
2927 "maximum number of nested calls that are inlined") \
2928 range(0, max_jint) \
2929 \
2930 product(intx, MaxRecursiveInlineLevel, 1, \
2931 "maximum number of nested recursive calls that are inlined") \
2932 range(0, max_jint) \
2933 \
2934 develop(intx, MaxForceInlineLevel, 100, \
2935 "maximum number of nested calls that are forced for inlining " \
2936 "(using CompileCommand or marked w/ @ForceInline)") \
2937 range(0, max_jint) \
2938 \
2939 product_pd(intx, InlineSmallCode, \
2940 "Only inline already compiled methods if their code size is " \
2941 "less than this") \
2942 range(0, max_jint) \
2943 \
2944 product(intx, MaxInlineSize, 35, \
2945 "The maximum bytecode size of a method to be inlined") \
2946 range(0, max_jint) \
2947 \
2948 product_pd(intx, FreqInlineSize, \
2949 "The maximum bytecode size of a frequent method to be inlined") \
2950 range(0, max_jint) \
2951 \
2952 product(intx, MaxTrivialSize, 6, \
2953 "The maximum bytecode size of a trivial method to be inlined") \
2954 range(0, max_jint) \
2955 \
2956 product(intx, MinInliningThreshold, 250, \
2957 "The minimum invocation count a method needs to have to be " \
2958 "inlined") \
2959 range(0, max_jint) \
2960 \
2961 develop(intx, MethodHistogramCutoff, 100, \
2962 "The cutoff value for method invocation histogram (+CountCalls)") \
2963 \
2964 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
2965 "Number of interpreted methods to show in profile") \
2966 \
2967 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
2968 "Number of compiled methods to show in profile") \
2969 \
2970 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
2971 "Number of stub methods to show in profile") \
2972 \
2973 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2974 "Number of runtime stub nodes to show in profile") \
2975 \
2976 product(intx, ProfileIntervalsTicks, 100, \
2977 "Number of ticks between printing of interval profile " \
2978 "(+ProfileIntervals)") \
2979 range(0, max_intx) \
2980 \
2981 notproduct(intx, ScavengeALotInterval, 1, \
2982 "Interval between which scavenge will occur with +ScavengeALot") \
2983 \
2984 notproduct(intx, FullGCALotInterval, 1, \
2985 "Interval between which full gc will occur with +FullGCALot") \
2986 \
2987 notproduct(intx, FullGCALotStart, 0, \
2988 "For which invocation to start FullGCAlot") \
2989 \
2990 notproduct(intx, FullGCALotDummies, 32*K, \
2991 "Dummy object allocated with +FullGCALot, forcing all objects " \
2992 "to move") \
2993 \
2994 develop(intx, DontYieldALotInterval, 10, \
2995 "Interval between which yields will be dropped (milliseconds)") \
2996 \
2997 develop(intx, ProfilerPCTickThreshold, 15, \
2998 "Number of ticks in a PC buckets to be a hotspot") \
2999 \
3000 notproduct(intx, DeoptimizeALotInterval, 5, \
3001 "Number of exits until DeoptimizeALot kicks in") \
3002 \
3003 notproduct(intx, ZombieALotInterval, 5, \
3004 "Number of exits until ZombieALot kicks in") \
3005 \
3006 diagnostic(uintx, MallocMaxTestWords, 0, \
3007 "If non-zero, maximum number of words that malloc/realloc can " \
3008 "allocate (for testing only)") \
3009 range(0, max_uintx) \
3010 \
3011 product(intx, TypeProfileWidth, 2, \
3012 "Number of receiver types to record in call/cast profile") \
3013 range(0, 8) \
3014 \
3015 develop(intx, BciProfileWidth, 2, \
3016 "Number of return bci's to record in ret profile") \
3017 \
3018 product(intx, PerMethodRecompilationCutoff, 400, \
3019 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3020 range(-1, max_intx) \
3021 \
3022 product(intx, PerBytecodeRecompilationCutoff, 200, \
3023 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3024 range(-1, max_intx) \
3025 \
3026 product(intx, PerMethodTrapLimit, 100, \
3027 "Limit on traps (of one kind) in a method (includes inlines)") \
3028 range(0, max_jint) \
3029 \
3030 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3031 "Limit on speculative traps (of one kind) in a method " \
3032 "(includes inlines)") \
3033 range(0, max_jint) \
3034 \
3035 product(intx, PerBytecodeTrapLimit, 4, \
3036 "Limit on traps (of one kind) at a particular BCI") \
3037 range(0, max_jint) \
3038 \
3039 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3040 "Extra method data trap entries for speculation") \
3041 \
3042 develop(intx, InlineFrequencyRatio, 20, \
3043 "Ratio of call site execution to caller method invocation") \
3044 range(0, max_jint) \
3045 \
3046 diagnostic_pd(intx, InlineFrequencyCount, \
3047 "Count of call site execution necessary to trigger frequent " \
3048 "inlining") \
3049 range(0, max_jint) \
3050 \
3051 develop(intx, InlineThrowCount, 50, \
3052 "Force inlining of interpreted methods that throw this often") \
3053 range(0, max_jint) \
3054 \
3055 develop(intx, InlineThrowMaxSize, 200, \
3056 "Force inlining of throwing methods smaller than this") \
3057 range(0, max_jint) \
3058 \
3059 develop(intx, ProfilerNodeSize, 1024, \
3060 "Size in K to allocate for the Profile Nodes of each thread") \
3061 range(0, 1024) \
3062 \
3063 /* gc parameters */ \
3064 product(size_t, InitialHeapSize, 0, \
3065 "Initial heap size (in bytes); zero means use ergonomics") \
3066 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3067 \
3068 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3069 "Maximum heap size (in bytes)") \
3070 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3071 \
3072 product(size_t, OldSize, ScaleForWordSize(4*M), \
3073 "Initial tenured generation size (in bytes)") \
3074 range(0, max_uintx) \
3075 \
3076 product(size_t, NewSize, ScaleForWordSize(1*M), \
3077 "Initial new generation size (in bytes)") \
3078 constraint(NewSizeConstraintFunc,AfterErgo) \
3079 \
3080 product(size_t, MaxNewSize, max_uintx, \
3081 "Maximum new generation size (in bytes), max_uintx means set " \
3082 "ergonomically") \
3083 range(0, max_uintx) \
3084 \
3085 product_pd(size_t, HeapBaseMinAddress, \
3086 "OS specific low limit for heap base address") \
3087 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3088 \
3089 product(size_t, PretenureSizeThreshold, 0, \
3090 "Maximum size in bytes of objects allocated in DefNew " \
3091 "generation; zero means no maximum") \
3092 range(0, max_uintx) \
3093 \
3094 product(size_t, MinTLABSize, 2*K, \
3095 "Minimum allowed TLAB size (in bytes)") \
3096 range(1, max_uintx/2) \
3097 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3098 \
3099 product(size_t, TLABSize, 0, \
3100 "Starting TLAB size (in bytes); zero means set ergonomically") \
3101 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3102 \
3103 product(size_t, YoungPLABSize, 4096, \
3104 "Size of young gen promotion LAB's (in HeapWords)") \
3105 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3106 \
3107 product(size_t, OldPLABSize, 1024, \
3108 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3109 "of blocks to attempt to claim when refilling CMS LAB's") \
3110 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3111 \
3112 product(uintx, TLABAllocationWeight, 35, \
3113 "Allocation averaging weight") \
3114 range(0, 100) \
3115 \
3116 /* Limit the lower bound of this flag to 1 as it is used */ \
3117 /* in a division expression. */ \
3118 product(uintx, TLABWasteTargetPercent, 1, \
3119 "Percentage of Eden that can be wasted") \
3120 range(1, 100) \
3121 \
3122 product(uintx, TLABRefillWasteFraction, 64, \
3123 "Maximum TLAB waste at a refill (internal fragmentation)") \
3124 range(1, max_juint) \
3125 \
3126 product(uintx, TLABWasteIncrement, 4, \
3127 "Increment allowed waste at slow allocation") \
3128 range(0, max_jint) \
3129 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3130 \
3131 product(uintx, SurvivorRatio, 8, \
3132 "Ratio of eden/survivor space size") \
3133 range(1, max_uintx-2) \
3134 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3135 \
3136 product(uintx, NewRatio, 2, \
3137 "Ratio of old/new generation sizes") \
3138 range(0, max_uintx-1) \
3139 \
3140 product_pd(size_t, NewSizeThreadIncrease, \
3141 "Additional size added to desired new generation size per " \
3142 "non-daemon thread (in bytes)") \
3143 range(0, max_uintx) \
3144 \
3145 product_pd(size_t, MetaspaceSize, \
3146 "Initial threshold (in bytes) at which a garbage collection " \
3147 "is done to reduce Metaspace usage") \
3148 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3149 \
3150 product(size_t, MaxMetaspaceSize, max_uintx, \
3151 "Maximum size of Metaspaces (in bytes)") \
3152 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3153 \
3154 product(size_t, CompressedClassSpaceSize, 1*G, \
3155 "Maximum size of class area in Metaspace when compressed " \
3156 "class pointers are used") \
3157 range(1*M, 3*G) \
3158 \
3159 manageable(uintx, MinHeapFreeRatio, 40, \
3160 "The minimum percentage of heap free after GC to avoid expansion."\
3161 " For most GCs this applies to the old generation. In G1 and" \
3162 " ParallelGC it applies to the whole heap.") \
3163 range(0, 100) \
3164 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3165 \
3166 manageable(uintx, MaxHeapFreeRatio, 70, \
3167 "The maximum percentage of heap free after GC to avoid shrinking."\
3168 " For most GCs this applies to the old generation. In G1 and" \
3169 " ParallelGC it applies to the whole heap.") \
3170 range(0, 100) \
3171 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3172 \
3173 product(bool, ShrinkHeapInSteps, true, \
3174 "When disabled, informs the GC to shrink the java heap directly" \
3175 " to the target size at the next full GC rather than requiring" \
3176 " smaller steps during multiple full GCs.") \
3177 \
3178 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3179 "Number of milliseconds per MB of free space in the heap") \
3180 range(0, max_intx) \
3181 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3182 \
3183 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3184 "The minimum change in heap space due to GC (in bytes)") \
3185 range(0, max_uintx) \
3186 \
3187 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3188 "The minimum expansion of Metaspace (in bytes)") \
3189 range(0, max_uintx) \
3190 \
3191 product(uintx, MaxMetaspaceFreeRatio, 70, \
3192 "The maximum percentage of Metaspace free after GC to avoid " \
3193 "shrinking") \
3194 range(0, 100) \
3195 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3196 \
3197 product(uintx, MinMetaspaceFreeRatio, 40, \
3198 "The minimum percentage of Metaspace free after GC to avoid " \
3199 "expansion") \
3200 range(0, 99) \
3201 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3202 \
3203 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3204 "The maximum expansion of Metaspace without full GC (in bytes)") \
3205 range(0, max_uintx) \
3206 \
3207 product(uintx, QueuedAllocationWarningCount, 0, \
3208 "Number of times an allocation that queues behind a GC " \
3209 "will retry before printing a warning") \
3210 range(0, max_uintx) \
3211 \
3212 diagnostic(uintx, VerifyGCStartAt, 0, \
3213 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3214 range(0, max_uintx) \
3215 \
3216 diagnostic(intx, VerifyGCLevel, 0, \
3217 "Generation level at which to start +VerifyBefore/AfterGC") \
3218 range(0, 1) \
3219 \
3220 product(uintx, MaxTenuringThreshold, 15, \
3221 "Maximum value for tenuring threshold") \
3222 range(0, markOopDesc::max_age + 1) \
3223 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3224 \
3225 product(uintx, InitialTenuringThreshold, 7, \
3226 "Initial value for tenuring threshold") \
3227 range(0, markOopDesc::max_age + 1) \
3228 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3229 \
3230 product(uintx, TargetSurvivorRatio, 50, \
3231 "Desired percentage of survivor space used after scavenge") \
3232 range(0, 100) \
3233 \
3234 product(uintx, MarkSweepDeadRatio, 5, \
3235 "Percentage (0-100) of the old gen allowed as dead wood. " \
3236 "Serial mark sweep treats this as both the minimum and maximum " \
3237 "value. " \
3238 "CMS uses this value only if it falls back to mark sweep. " \
3239 "Par compact uses a variable scale based on the density of the " \
3240 "generation and treats this as the maximum value when the heap " \
3241 "is either completely full or completely empty. Par compact " \
3242 "also has a smaller default value; see arguments.cpp.") \
3243 range(0, 100) \
3244 \
3245 product(uint, MarkSweepAlwaysCompactCount, 4, \
3246 "How often should we fully compact the heap (ignoring the dead " \
3247 "space parameters)") \
3248 range(1, max_juint) \
3249 \
3250 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3251 "Delay between expansion and allocation (in milliseconds)") \
3252 \
3253 develop(uintx, GCWorkerDelayMillis, 0, \
3254 "Delay in scheduling GC workers (in milliseconds)") \
3255 \
3256 product(bool, PSChunkLargeArrays, true, \
3257 "Process large arrays in chunks") \
3258 \
3259 product(uintx, GCDrainStackTargetSize, 64, \
3260 "Number of entries we will try to leave on the stack " \
3261 "during parallel gc") \
3262 range(0, max_juint) \
3263 \
3264 /* stack parameters */ \
3265 product_pd(intx, StackYellowPages, \
3266 "Number of yellow zone (recoverable overflows) pages of size " \
3267 "4KB. If pages are bigger yellow zone is aligned up.") \
3268 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3269 \
3270 product_pd(intx, StackRedPages, \
3271 "Number of red zone (unrecoverable overflows) pages of size " \
3272 "4KB. If pages are bigger red zone is aligned up.") \
3273 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3274 \
3275 product_pd(intx, StackReservedPages, \
3276 "Number of reserved zone (reserved to annotated methods) pages" \
3277 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3278 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3279 \
3280 product(bool, RestrictReservedStack, true, \
3281 "Restrict @ReservedStackAccess to trusted classes") \
3282 \
3283 /* greater stack shadow pages can't generate instruction to bang stack */ \
3284 product_pd(intx, StackShadowPages, \
3285 "Number of shadow zone (for overflow checking) pages of size " \
3286 "4KB. If pages are bigger shadow zone is aligned up. " \
3287 "This should exceed the depth of the VM and native call stack.") \
3288 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3289 \
3290 product_pd(intx, ThreadStackSize, \
3291 "Thread Stack Size (in Kbytes)") \
3292 range(0, 1 * M) \
3293 \
3294 product_pd(intx, VMThreadStackSize, \
3295 "Non-Java Thread Stack Size (in Kbytes)") \
3296 range(0, max_intx/(1 * K)) \
3297 \
3298 product_pd(intx, CompilerThreadStackSize, \
3299 "Compiler Thread Stack Size (in Kbytes)") \
3300 range(0, max_intx/(1 * K)) \
3301 \
3302 develop_pd(size_t, JVMInvokeMethodSlack, \
3303 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3304 \
3305 /* code cache parameters */ \
3306 develop_pd(uintx, CodeCacheSegmentSize, \
3307 "Code cache segment size (in bytes) - smallest unit of " \
3308 "allocation") \
3309 range(1, 1024) \
3310 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3311 \
3312 develop_pd(intx, CodeEntryAlignment, \
3313 "Code entry alignment for generated code (in bytes)") \
3314 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3315 \
3316 product_pd(intx, OptoLoopAlignment, \
3317 "Align inner loops to zero relative to this modulus") \
3318 range(1, 16) \
3319 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3320 \
3321 product_pd(uintx, InitialCodeCacheSize, \
3322 "Initial code cache size (in bytes)") \
3323 range(os::vm_page_size(), max_uintx) \
3324 \
3325 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3326 "Minimum code cache size (in bytes) required to start VM.") \
3327 range(0, max_uintx) \
3328 \
3329 product(bool, SegmentedCodeCache, false, \
3330 "Use a segmented code cache") \
3331 \
3332 product_pd(uintx, ReservedCodeCacheSize, \
3333 "Reserved code cache size (in bytes) - maximum code cache size") \
3334 range(os::vm_page_size(), max_uintx) \
3335 \
3336 product_pd(uintx, NonProfiledCodeHeapSize, \
3337 "Size of code heap with non-profiled methods (in bytes)") \
3338 range(0, max_uintx) \
3339 \
3340 product_pd(uintx, ProfiledCodeHeapSize, \
3341 "Size of code heap with profiled methods (in bytes)") \
3342 range(0, max_uintx) \
3343 \
3344 product_pd(uintx, NonNMethodCodeHeapSize, \
3345 "Size of code heap with non-nmethods (in bytes)") \
3346 range(os::vm_page_size(), max_uintx) \
3347 \
3348 product_pd(uintx, CodeCacheExpansionSize, \
3349 "Code cache expansion size (in bytes)") \
3350 range(32*K, max_uintx) \
3351 \
3352 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
3353 "Minimum number of segments in a code cache block") \
3354 range(1, 100) \
3355 \
3356 notproduct(bool, ExitOnFullCodeCache, false, \
3357 "Exit the VM if we fill the code cache") \
3358 \
3359 product(bool, UseCodeCacheFlushing, true, \
3360 "Remove cold/old nmethods from the code cache") \
3361 \
3362 product(uintx, StartAggressiveSweepingAt, 10, \
3363 "Start aggressive sweeping if X[%] of the code cache is free." \
3364 "Segmented code cache: X[%] of the non-profiled heap." \
3365 "Non-segmented code cache: X[%] of the total code cache") \
3366 range(0, 100) \
3367 \
3368 /* AOT parameters */ \
3369 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \
3370 "Use AOT compiled files") \
3371 \
3372 product(ccstrlist, AOTLibrary, NULL, \
3373 "AOT library") \
3374 \
3375 product(bool, PrintAOT, false, \
3376 "Print used AOT klasses and methods") \
3377 \
3378 notproduct(bool, PrintAOTStatistics, false, \
3379 "Print AOT statistics") \
3380 \
3381 diagnostic(bool, UseAOTStrictLoading, false, \
3382 "Exit the VM if any of the AOT libraries has invalid config") \
3383 \
3384 product(bool, CalculateClassFingerprint, false, \
3385 "Calculate class fingerprint") \
3386 \
3387 /* interpreter debugging */ \
3388 develop(intx, BinarySwitchThreshold, 5, \
3389 "Minimal number of lookupswitch entries for rewriting to binary " \
3390 "switch") \
3391 \
3392 develop(intx, StopInterpreterAt, 0, \
3393 "Stop interpreter execution at specified bytecode number") \
3394 \
3395 develop(intx, TraceBytecodesAt, 0, \
3396 "Trace bytecodes starting with specified bytecode number") \
3397 \
3398 /* compiler interface */ \
3399 develop(intx, CIStart, 0, \
3400 "The id of the first compilation to permit") \
3401 \
3402 develop(intx, CIStop, max_jint, \
3403 "The id of the last compilation to permit") \
3404 \
3405 develop(intx, CIStartOSR, 0, \
3406 "The id of the first osr compilation to permit " \
3407 "(CICountOSR must be on)") \
3408 \
3409 develop(intx, CIStopOSR, max_jint, \
3410 "The id of the last osr compilation to permit " \
3411 "(CICountOSR must be on)") \
3412 \
3413 develop(intx, CIBreakAtOSR, -1, \
3414 "The id of osr compilation to break at") \
3415 \
3416 develop(intx, CIBreakAt, -1, \
3417 "The id of compilation to break at") \
3418 \
3419 product(ccstrlist, CompileOnly, "", \
3420 "List of methods (pkg/class.name) to restrict compilation to") \
3421 \
3422 product(ccstr, CompileCommandFile, NULL, \
3423 "Read compiler commands from this file [.hotspot_compiler]") \
3424 \
3425 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3426 "Read compiler directives from this file") \
3427 \
3428 product(ccstrlist, CompileCommand, "", \
3429 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3430 \
3431 develop(bool, ReplayCompiles, false, \
3432 "Enable replay of compilations from ReplayDataFile") \
3433 \
3434 product(ccstr, ReplayDataFile, NULL, \
3435 "File containing compilation replay information" \
3436 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3437 \
3438 product(ccstr, InlineDataFile, NULL, \
3439 "File containing inlining replay information" \
3440 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3441 \
3442 develop(intx, ReplaySuppressInitializers, 2, \
3443 "Control handling of class initialization during replay: " \
3444 "0 - don't do anything special; " \
3445 "1 - treat all class initializers as empty; " \
3446 "2 - treat class initializers for application classes as empty; " \
3447 "3 - allow all class initializers to run during bootstrap but " \
3448 " pretend they are empty after starting replay") \
3449 range(0, 3) \
3450 \
3451 develop(bool, ReplayIgnoreInitErrors, false, \
3452 "Ignore exceptions thrown during initialization for replay") \
3453 \
3454 product(bool, DumpReplayDataOnError, true, \
3455 "Record replay data for crashing compiler threads") \
3456 \
3457 product(bool, CICompilerCountPerCPU, false, \
3458 "1 compiler thread for log(N CPUs)") \
3459 \
3460 develop(intx, CIFireOOMAt, -1, \
3461 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3462 "(non-negative value throws OOM after this many CI accesses " \
3463 "in each compile)") \
3464 notproduct(intx, CICrashAt, -1, \
3465 "id of compilation to trigger assert in compiler thread for " \
3466 "the purpose of testing, e.g. generation of replay data") \
3467 notproduct(bool, CIObjectFactoryVerify, false, \
3468 "enable potentially expensive verification in ciObjectFactory") \
3469 \
3470 /* Priorities */ \
3471 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3472 \
3473 product(intx, ThreadPriorityPolicy, 0, \
3474 "0 : Normal. "\
3475 " VM chooses priorities that are appropriate for normal "\
3476 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3477 " to normal native priority. Java priorities below " \
3478 " NORM_PRIORITY map to lower native priority values. On "\
3479 " Windows applications are allowed to use higher native "\
3480 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3481 " not use the highest possible native priority, "\
3482 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3483 " system threads. On Linux thread priorities are ignored "\
3484 " because the OS does not support static priority in "\
3485 " SCHED_OTHER scheduling class which is the only choice for "\
3486 " non-root, non-realtime applications. "\
3487 "1 : Aggressive. "\
3488 " Java thread priorities map over to the entire range of "\
3489 " native thread priorities. Higher Java thread priorities map "\
3490 " to higher native thread priorities. This policy should be "\
3491 " used with care, as sometimes it can cause performance "\
3492 " degradation in the application and/or the entire system. On "\
3493 " Linux this policy requires root privilege.") \
3494 range(0, 1) \
3495 \
3496 product(bool, ThreadPriorityVerbose, false, \
3497 "Print priority changes") \
3498 \
3499 product(intx, CompilerThreadPriority, -1, \
3500 "The native priority at which compiler threads should run " \
3501 "(-1 means no change)") \
3502 range(min_jint, max_jint) \
3503 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3504 \
3505 product(intx, VMThreadPriority, -1, \
3506 "The native priority at which the VM thread should run " \
3507 "(-1 means no change)") \
3508 range(-1, 127) \
3509 \
3510 product(bool, CompilerThreadHintNoPreempt, false, \
3511 "(Solaris only) Give compiler threads an extra quanta") \
3512 \
3513 product(bool, VMThreadHintNoPreempt, false, \
3514 "(Solaris only) Give VM thread an extra quanta") \
3515 \
3516 product(intx, JavaPriority1_To_OSPriority, -1, \
3517 "Map Java priorities to OS priorities") \
3518 range(-1, 127) \
3519 \
3520 product(intx, JavaPriority2_To_OSPriority, -1, \
3521 "Map Java priorities to OS priorities") \
3522 range(-1, 127) \
3523 \
3524 product(intx, JavaPriority3_To_OSPriority, -1, \
3525 "Map Java priorities to OS priorities") \
3526 range(-1, 127) \
3527 \
3528 product(intx, JavaPriority4_To_OSPriority, -1, \
3529 "Map Java priorities to OS priorities") \
3530 range(-1, 127) \
3531 \
3532 product(intx, JavaPriority5_To_OSPriority, -1, \
3533 "Map Java priorities to OS priorities") \
3534 range(-1, 127) \
3535 \
3536 product(intx, JavaPriority6_To_OSPriority, -1, \
3537 "Map Java priorities to OS priorities") \
3538 range(-1, 127) \
3539 \
3540 product(intx, JavaPriority7_To_OSPriority, -1, \
3541 "Map Java priorities to OS priorities") \
3542 range(-1, 127) \
3543 \
3544 product(intx, JavaPriority8_To_OSPriority, -1, \
3545 "Map Java priorities to OS priorities") \
3546 range(-1, 127) \
3547 \
3548 product(intx, JavaPriority9_To_OSPriority, -1, \
3549 "Map Java priorities to OS priorities") \
3550 range(-1, 127) \
3551 \
3552 product(intx, JavaPriority10_To_OSPriority,-1, \
3553 "Map Java priorities to OS priorities") \
3554 range(-1, 127) \
3555 \
3556 experimental(bool, UseCriticalJavaThreadPriority, false, \
3557 "Java thread priority 10 maps to critical scheduling priority") \
3558 \
3559 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3560 "Compiler thread(s) run at critical scheduling priority") \
3561 \
3562 experimental(bool, UseCriticalCMSThreadPriority, false, \
3563 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3564 \
3565 /* compiler debugging */ \
3566 notproduct(intx, CompileTheWorldStartAt, 1, \
3567 "First class to consider when using +CompileTheWorld") \
3568 \
3569 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3570 "Last class to consider when using +CompileTheWorld") \
3571 \
3572 develop(intx, NewCodeParameter, 0, \
3573 "Testing Only: Create a dedicated integer parameter before " \
3574 "putback") \
3575 \
3576 /* new oopmap storage allocation */ \
3577 develop(intx, MinOopMapAllocation, 8, \
3578 "Minimum number of OopMap entries in an OopMapSet") \
3579 \
3580 /* Background Compilation */ \
3581 develop(intx, LongCompileThreshold, 50, \
3582 "Used with +TraceLongCompiles") \
3583 \
3584 /* recompilation */ \
3585 product_pd(intx, CompileThreshold, \
3586 "number of interpreted method invocations before (re-)compiling") \
3587 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3588 \
3589 product(double, CompileThresholdScaling, 1.0, \
3590 "Factor to control when first compilation happens " \
3591 "(both with and without tiered compilation): " \
3592 "values greater than 1.0 delay counter overflow, " \
3593 "values between 0 and 1.0 rush counter overflow, " \
3594 "value of 1.0 leaves compilation thresholds unchanged " \
3595 "value of 0.0 is equivalent to -Xint. " \
3596 "" \
3597 "Flag can be set as per-method option. " \
3598 "If a value is specified for a method, compilation thresholds " \
3599 "for that method are scaled by both the value of the global flag "\
3600 "and the value of the per-method flag.") \
3601 range(0.0, DBL_MAX) \
3602 \
3603 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3604 "Interpreter (tier 0) invocation notification frequency") \
3605 range(0, 30) \
3606 \
3607 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3608 "C1 without MDO (tier 2) invocation notification frequency") \
3609 range(0, 30) \
3610 \
3611 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3612 "C1 with MDO profiling (tier 3) invocation notification " \
3613 "frequency") \
3614 range(0, 30) \
3615 \
3616 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3617 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3618 range(0, 30) \
3619 \
3620 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3621 "Interpreter (tier 0) invocation notification frequency") \
3622 range(0, 30) \
3623 \
3624 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3625 "C1 without MDO (tier 2) invocation notification frequency") \
3626 range(0, 30) \
3627 \
3628 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3629 "C1 with MDO profiling (tier 3) invocation notification " \
3630 "frequency") \
3631 range(0, 30) \
3632 \
3633 product(intx, Tier2CompileThreshold, 0, \
3634 "threshold at which tier 2 compilation is invoked") \
3635 range(0, max_jint) \
3636 \
3637 product(intx, Tier2BackEdgeThreshold, 0, \
3638 "Back edge threshold at which tier 2 compilation is invoked") \
3639 range(0, max_jint) \
3640 \
3641 product(intx, Tier3InvocationThreshold, 200, \
3642 "Compile if number of method invocations crosses this " \
3643 "threshold") \
3644 range(0, max_jint) \
3645 \
3646 product(intx, Tier3MinInvocationThreshold, 100, \
3647 "Minimum invocation to compile at tier 3") \
3648 range(0, max_jint) \
3649 \
3650 product(intx, Tier3CompileThreshold, 2000, \
3651 "Threshold at which tier 3 compilation is invoked (invocation " \
3652 "minimum must be satisfied)") \
3653 range(0, max_jint) \
3654 \
3655 product(intx, Tier3BackEdgeThreshold, 60000, \
3656 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3657 range(0, max_jint) \
3658 \
3659 product(intx, Tier3AOTInvocationThreshold, 10000, \
3660 "Compile if number of method invocations crosses this " \
3661 "threshold if coming from AOT") \
3662 range(0, max_jint) \
3663 \
3664 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
3665 "Minimum invocation to compile at tier 3 if coming from AOT") \
3666 range(0, max_jint) \
3667 \
3668 product(intx, Tier3AOTCompileThreshold, 15000, \
3669 "Threshold at which tier 3 compilation is invoked (invocation " \
3670 "minimum must be satisfied) if coming from AOT") \
3671 range(0, max_jint) \
3672 \
3673 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
3674 "Back edge threshold at which tier 3 OSR compilation is invoked " \
3675 "if coming from AOT") \
3676 range(0, max_jint) \
3677 \
3678 product(intx, Tier4InvocationThreshold, 5000, \
3679 "Compile if number of method invocations crosses this " \
3680 "threshold") \
3681 range(0, max_jint) \
3682 \
3683 product(intx, Tier4MinInvocationThreshold, 600, \
3684 "Minimum invocation to compile at tier 4") \
3685 range(0, max_jint) \
3686 \
3687 product(intx, Tier4CompileThreshold, 15000, \
3688 "Threshold at which tier 4 compilation is invoked (invocation " \
3689 "minimum must be satisfied") \
3690 range(0, max_jint) \
3691 \
3692 product(intx, Tier4BackEdgeThreshold, 40000, \
3693 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3694 range(0, max_jint) \
3695 \
3696 product(intx, Tier3DelayOn, 5, \
3697 "If C2 queue size grows over this amount per compiler thread " \
3698 "stop compiling at tier 3 and start compiling at tier 2") \
3699 range(0, max_jint) \
3700 \
3701 product(intx, Tier3DelayOff, 2, \
3702 "If C2 queue size is less than this amount per compiler thread " \
3703 "allow methods compiled at tier 2 transition to tier 3") \
3704 range(0, max_jint) \
3705 \
3706 product(intx, Tier3LoadFeedback, 5, \
3707 "Tier 3 thresholds will increase twofold when C1 queue size " \
3708 "reaches this amount per compiler thread") \
3709 range(0, max_jint) \
3710 \
3711 product(intx, Tier4LoadFeedback, 3, \
3712 "Tier 4 thresholds will increase twofold when C2 queue size " \
3713 "reaches this amount per compiler thread") \
3714 range(0, max_jint) \
3715 \
3716 product(intx, TieredCompileTaskTimeout, 50, \
3717 "Kill compile task if method was not used within " \
3718 "given timeout in milliseconds") \
3719 range(0, max_intx) \
3720 \
3721 product(intx, TieredStopAtLevel, 4, \
3722 "Stop at given compilation level") \
3723 range(0, 4) \
3724 \
3725 product(intx, Tier0ProfilingStartPercentage, 200, \
3726 "Start profiling in interpreter if the counters exceed tier 3 " \
3727 "thresholds by the specified percentage") \
3728 range(0, max_jint) \
3729 \
3730 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3731 "Increase the compile threshold for C1 compilation if the code " \
3732 "cache is filled by the specified percentage") \
3733 range(0, 99) \
3734 \
3735 product(intx, TieredRateUpdateMinTime, 1, \
3736 "Minimum rate sampling interval (in milliseconds)") \
3737 range(0, max_intx) \
3738 \
3739 product(intx, TieredRateUpdateMaxTime, 25, \
3740 "Maximum rate sampling interval (in milliseconds)") \
3741 range(0, max_intx) \
3742 \
3743 product_pd(bool, TieredCompilation, \
3744 "Enable tiered compilation") \
3745 \
3746 product(bool, PrintTieredEvents, false, \
3747 "Print tiered events notifications") \
3748 \
3749 product_pd(intx, OnStackReplacePercentage, \
3750 "NON_TIERED number of method invocations/branches (expressed as " \
3751 "% of CompileThreshold) before (re-)compiling OSR code") \
3752 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3753 \
3754 product(intx, InterpreterProfilePercentage, 33, \
3755 "NON_TIERED number of method invocations/branches (expressed as " \
3756 "% of CompileThreshold) before profiling in the interpreter") \
3757 range(0, 100) \
3758 \
3759 develop(intx, MaxRecompilationSearchLength, 10, \
3760 "The maximum number of frames to inspect when searching for " \
3761 "recompilee") \
3762 \
3763 develop(intx, MaxInterpretedSearchLength, 3, \
3764 "The maximum number of interpreted frames to skip when searching "\
3765 "for recompilee") \
3766 \
3767 develop(intx, DesiredMethodLimit, 8000, \
3768 "The desired maximum method size (in bytecodes) after inlining") \
3769 \
3770 develop(intx, HugeMethodLimit, 8000, \
3771 "Don't compile methods larger than this if " \
3772 "+DontCompileHugeMethods") \
3773 \
3774 /* New JDK 1.4 reflection implementation */ \
3775 \
3776 develop(intx, FastSuperclassLimit, 8, \
3777 "Depth of hardwired instanceof accelerator array") \
3778 \
3779 /* Properties for Java libraries */ \
3780 \
3781 product(uint64_t, MaxDirectMemorySize, 0, \
3782 "Maximum total size of NIO direct-buffer allocations") \
3783 range(0, max_jlong) \
3784 \
3785 /* Flags used for temporary code during development */ \
3786 \
3787 diagnostic(bool, UseNewCode, false, \
3788 "Testing Only: Use the new version while testing") \
3789 \
3790 diagnostic(bool, UseNewCode2, false, \
3791 "Testing Only: Use the new version while testing") \
3792 \
3793 diagnostic(bool, UseNewCode3, false, \
3794 "Testing Only: Use the new version while testing") \
3795 \
3796 /* flags for performance data collection */ \
3797 \
3798 product(bool, UsePerfData, true, \
3799 "Flag to disable jvmstat instrumentation for performance testing "\
3800 "and problem isolation purposes") \
3801 \
3802 product(bool, PerfDataSaveToFile, false, \
3803 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3804 \
3805 product(ccstr, PerfDataSaveFile, NULL, \
3806 "Save PerfData memory to the specified absolute pathname. " \
3807 "The string %p in the file name (if present) " \
3808 "will be replaced by pid") \
3809 \
3810 product(intx, PerfDataSamplingInterval, 50, \
3811 "Data sampling interval (in milliseconds)") \
3812 range(PeriodicTask::min_interval, max_jint) \
3813 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3814 \
3815 product(bool, PerfDisableSharedMem, false, \
3816 "Store performance data in standard memory") \
3817 \
3818 product(intx, PerfDataMemorySize, 32*K, \
3819 "Size of performance data memory region. Will be rounded " \
3820 "up to a multiple of the native os page size.") \
3821 range(128, 32*64*K) \
3822 \
3823 product(intx, PerfMaxStringConstLength, 1024, \
3824 "Maximum PerfStringConstant string length before truncation") \
3825 range(32, 32*K) \
3826 \
3827 product(bool, PerfAllowAtExitRegistration, false, \
3828 "Allow registration of atexit() methods") \
3829 \
3830 product(bool, PerfBypassFileSystemCheck, false, \
3831 "Bypass Win32 file system criteria checks (Windows Only)") \
3832 \
3833 product(intx, UnguardOnExecutionViolation, 0, \
3834 "Unguard page and retry on no-execute fault (Win32 only) " \
3835 "0=off, 1=conservative, 2=aggressive") \
3836 range(0, 2) \
3837 \
3838 /* Serviceability Support */ \
3839 \
3840 product(bool, ManagementServer, false, \
3841 "Create JMX Management Server") \
3842 \
3843 product(bool, DisableAttachMechanism, false, \
3844 "Disable mechanism that allows tools to attach to this VM") \
3845 \
3846 product(bool, StartAttachListener, false, \
3847 "Always start Attach Listener at VM startup") \
3848 \
3849 product(bool, EnableDynamicAgentLoading, true, \
3850 "Allow tools to load agents with the attach mechanism") \
3851 \
3852 manageable(bool, PrintConcurrentLocks, false, \
3853 "Print java.util.concurrent locks in thread dump") \
3854 \
3855 product(bool, TransmitErrorReport, false, \
3856 "Enable error report transmission on erroneous termination") \
3857 \
3858 product(ccstr, ErrorReportServer, NULL, \
3859 "Override built-in error report server address") \
3860 \
3861 /* Shared spaces */ \
3862 \
3863 product(bool, UseSharedSpaces, true, \
3864 "Use shared spaces for metadata") \
3865 \
3866 product(bool, VerifySharedSpaces, false, \
3867 "Verify shared spaces (false for default archive, true for " \
3868 "archive specified by -XX:SharedArchiveFile)") \
3869 \
3870 product(bool, RequireSharedSpaces, false, \
3871 "Require shared spaces for metadata") \
3872 \
3873 product(bool, DumpSharedSpaces, false, \
3874 "Special mode: JVM reads a class list, loads classes, builds " \
3875 "shared spaces, and dumps the shared spaces to a file to be " \
3876 "used in future JVM runs") \
3877 \
3878 product(bool, PrintSharedArchiveAndExit, false, \
3879 "Print shared archive file contents") \
3880 \
3881 product(bool, PrintSharedDictionary, false, \
3882 "If PrintSharedArchiveAndExit is true, also print the shared " \
3883 "dictionary") \
3884 \
3885 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
3886 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3887 "Address to allocate shared memory region for class data") \
3888 range(0, SIZE_MAX) \
3889 \
3890 product(bool, UseAppCDS, false, \
3891 "Enable Application Class Data Sharing when using shared spaces") \
3892 writeable(CommandLineOnly) \
3893 \
3894 product(ccstr, SharedArchiveConfigFile, NULL, \
3895 "Data to add to the CDS archive file") \
3896 \
3897 product(uintx, SharedSymbolTableBucketSize, 4, \
3898 "Average number of symbols per bucket in shared table") \
3899 range(2, 246) \
3900 \
3901 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \
3902 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3903 "classes. Just exclude them from the shared dictionary.") \
3904 \
3905 diagnostic(bool, PrintMethodHandleStubs, false, \
3906 "Print generated stub code for method handles") \
3907 \
3908 develop(bool, TraceMethodHandles, false, \
3909 "trace internal method handle operations") \
3910 \
3911 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3912 "perform extra checks when constructing method handles") \
3913 \
3914 diagnostic(bool, ShowHiddenFrames, false, \
3915 "show method handle implementation frames (usually hidden)") \
3916 \
3917 experimental(bool, TrustFinalNonStaticFields, false, \
3918 "trust final non-static declarations for constant folding") \
3919 \
3920 diagnostic(bool, FoldStableValues, true, \
3921 "Optimize loads from stable fields (marked w/ @Stable)") \
3922 \
3923 develop(bool, TraceInvokeDynamic, false, \
3924 "trace internal invoke dynamic operations") \
3925 \
3926 diagnostic(int, UseBootstrapCallInfo, 1, \
3927 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
3928 "resolved before the bootstrap method is called; 1: when a BSM " \
3929 "that may accept a BootstrapCallInfo is detected, use that API " \
3930 "to pass BSM arguments, which allows the BSM to delay their " \
3931 "resolution; 2+: stress test the BCI API by calling more BSMs " \
3932 "via that API, instead of with the eagerly-resolved array.") \
3933 \
3934 diagnostic(bool, PauseAtStartup, false, \
3935 "Causes the VM to pause at startup time and wait for the pause " \
3936 "file to be removed (default: ./vm.paused.<pid>)") \
3937 \
3938 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3939 "The file to create and for whose removal to await when pausing " \
3940 "at startup. (default: ./vm.paused.<pid>)") \
3941 \
3942 diagnostic(bool, PauseAtExit, false, \
3943 "Pause and wait for keypress on exit if a debugger is attached") \
3944 \
3945 product(bool, ExtendedDTraceProbes, false, \
3946 "Enable performance-impacting dtrace probes") \
3947 \
3948 product(bool, DTraceMethodProbes, false, \
3949 "Enable dtrace probes for method-entry and method-exit") \
3950 \
3951 product(bool, DTraceAllocProbes, false, \
3952 "Enable dtrace probes for object allocation") \
3953 \
3954 product(bool, DTraceMonitorProbes, false, \
3955 "Enable dtrace probes for monitor events") \
3956 \
3957 product(bool, RelaxAccessControlCheck, false, \
3958 "Relax the access control checks in the verifier") \
3959 \
3960 product(uintx, StringTableSize, defaultStringTableSize, \
3961 "Number of buckets in the interned String table") \
3962 range(minimumStringTableSize, 111*defaultStringTableSize) \
3963 \
3964 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
3965 "Number of buckets in the JVM internal Symbol table") \
3966 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
3967 \
3968 product(bool, UseStringDeduplication, false, \
3969 "Use string deduplication") \
3970 \
3971 product(uintx, StringDeduplicationAgeThreshold, 3, \
3972 "A string must reach this age (or be promoted to an old region) " \
3973 "to be considered for deduplication") \
3974 range(1, markOopDesc::max_age) \
3975 \
3976 diagnostic(bool, StringDeduplicationResizeALot, false, \
3977 "Force table resize every time the table is scanned") \
3978 \
3979 diagnostic(bool, StringDeduplicationRehashALot, false, \
3980 "Force table rehash every time the table is scanned") \
3981 \
3982 diagnostic(bool, WhiteBoxAPI, false, \
3983 "Enable internal testing APIs") \
3984 \
3985 experimental(intx, SurvivorAlignmentInBytes, 0, \
3986 "Default survivor space alignment in bytes") \
3987 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
3988 \
3989 product(bool , AllowNonVirtualCalls, false, \
3990 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3991 \
3992 product(ccstr, DumpLoadedClassList, NULL, \
3993 "Dump the names all loaded classes, that could be stored into " \
3994 "the CDS archive, in the specified file") \
3995 \
3996 product(ccstr, SharedClassListFile, NULL, \
3997 "Override the default CDS class list") \
3998 \
3999 diagnostic(ccstr, SharedArchiveFile, NULL, \
4000 "Override the default location of the CDS archive file") \
4001 \
4002 product(ccstr, ExtraSharedClassListFile, NULL, \
4003 "Extra classlist for building the CDS archive file") \
4004 \
4005 experimental(size_t, ArrayAllocatorMallocLimit, \
4006 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4007 "Allocation less than this value will be allocated " \
4008 "using malloc. Larger allocations will use mmap.") \
4009 \
4010 experimental(bool, AlwaysAtomicAccesses, false, \
4011 "Accesses to all variables should always be atomic") \
4012 \
4013 product(bool, EnableTracing, false, \
4014 "Enable event-based tracing") \
4015 \
4016 product(bool, UseLockedTracing, false, \
4017 "Use locked-tracing when doing event-based tracing") \
4018 \
4019 diagnostic(bool, UseUnalignedAccesses, false, \
4020 "Use unaligned memory accesses in Unsafe") \
4021 \
4022 product_pd(bool, PreserveFramePointer, \
4023 "Use the FP register for holding the frame pointer " \
4024 "and not as a general purpose register.") \
4025 \
4026 diagnostic(bool, CheckIntrinsics, true, \
4027 "When a class C is loaded, check that " \
4028 "(1) all intrinsics defined by the VM for class C are present "\
4029 "in the loaded class file and are marked with the " \
4030 "@HotSpotIntrinsicCandidate annotation, that " \
4031 "(2) there is an intrinsic registered for all loaded methods " \
4032 "that are annotated with the @HotSpotIntrinsicCandidate " \
4033 "annotation, and that " \
4034 "(3) no orphan methods exist for class C (i.e., methods for " \
4035 "which the VM declares an intrinsic but that are not declared "\
4036 "in the loaded class C. " \
4037 "Check (3) is available only in debug builds.") \
4038 \
4039 diagnostic_pd(intx, InitArrayShortSize, \
4040 "Threshold small size (in bytes) for clearing arrays. " \
4041 "Anything this size or smaller may get converted to discrete " \
4042 "scalar stores.") \
4043 range(0, max_intx) \
4044 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
4045 \
4046 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4047 "Disable backwards compatibility for compile commands.") \
4048 \
4049 diagnostic(bool, CompilerDirectivesPrint, false, \
4050 "Print compiler directives on installation.") \
4051 diagnostic(int, CompilerDirectivesLimit, 50, \
4052 "Limit on number of compiler directives.") \
4053 \
4054 product(ccstr, AllocateHeapAt, NULL, \
4055 "Path to the directoy where a temporary file will be created " \
4056 "to use as the backing store for Java Heap.") \
4057 \
4058 develop(bool, VerifyMetaspace, false, \
4059 "Verify metaspace on chunk movements.") \
4060 \
4061 diagnostic(bool, ShowRegistersOnAssert, false, \
4062 "On internal errors, include registers in error report.") \
4063 \
4064
4065
4066
4067 /*
4068 * Macros for factoring of globals
4069 */
4070
4071 // Interface macros
4072 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4073 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4074 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4075 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
4076 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4077 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4078 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4079 #ifdef PRODUCT
4080 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4081 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4082 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4083 #else
4084 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4085 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4086 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4087 #endif // PRODUCT
4088 // Special LP64 flags, product only needed for now.
4089 #ifdef _LP64
4090 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4091 #else
4092 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4093 #endif // _LP64
4094
4095 // Implementation macros
4096 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4097 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4098 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4099 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name;
4100 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4101 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4102 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4103 #ifdef PRODUCT
4104 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4105 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4106 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4107 #else
4108 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4109 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4110 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4111 #endif // PRODUCT
4112 #ifdef _LP64
4113 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4114 #else
4115 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4116 #endif // _LP64
4117
4118 // Only materialize src code for range checking when required, ignore otherwise
4119 #define IGNORE_RANGE(a, b)
4120 // Only materialize src code for contraint checking when required, ignore otherwise
4121 #define IGNORE_CONSTRAINT(func,type)
4122
4123 #define IGNORE_WRITEABLE(type)
4124
4125 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4126 DECLARE_PD_DEVELOPER_FLAG, \
4127 DECLARE_PRODUCT_FLAG, \
4128 DECLARE_PD_PRODUCT_FLAG, \
4129 DECLARE_DIAGNOSTIC_FLAG, \
4130 DECLARE_PD_DIAGNOSTIC_FLAG, \
4131 DECLARE_EXPERIMENTAL_FLAG, \
4132 DECLARE_NOTPRODUCT_FLAG, \
4133 DECLARE_MANAGEABLE_FLAG, \
4134 DECLARE_PRODUCT_RW_FLAG, \
4135 DECLARE_LP64_PRODUCT_FLAG, \
4136 IGNORE_RANGE, \
4137 IGNORE_CONSTRAINT, \
4138 IGNORE_WRITEABLE)
4139
4140 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4141 DECLARE_PD_DEVELOPER_FLAG, \
4142 DECLARE_PRODUCT_FLAG, \
4143 DECLARE_PD_PRODUCT_FLAG, \
4144 DECLARE_DIAGNOSTIC_FLAG, \
4145 DECLARE_PD_DIAGNOSTIC_FLAG, \
4146 DECLARE_NOTPRODUCT_FLAG, \
4147 IGNORE_RANGE, \
4148 IGNORE_CONSTRAINT, \
4149 IGNORE_WRITEABLE)
4150
4151 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4152 DECLARE_PRODUCT_FLAG, \
4153 DECLARE_DIAGNOSTIC_FLAG, \
4154 DECLARE_EXPERIMENTAL_FLAG, \
4155 DECLARE_NOTPRODUCT_FLAG, \
4156 IGNORE_RANGE, \
4157 IGNORE_CONSTRAINT, \
4158 IGNORE_WRITEABLE)
4159
4160 // Extensions
4161
4162 #include "runtime/globals_ext.hpp"
4163
4164 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP