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(intx, UseSSE, 99, \
675 "Highest supported SSE instructions set on x86/x64") \
676 range(0, 99) \
677 \
678 product(bool, UseAES, false, \
679 "Control whether AES instructions are used when available") \
680 \
681 product(bool, UseFMA, false, \
682 "Control whether FMA instructions are used when available") \
683 \
684 product(bool, UseSHA, false, \
685 "Control whether SHA instructions are used when available") \
686 \
687 diagnostic(bool, UseGHASHIntrinsics, false, \
688 "Use intrinsics for GHASH versions of crypto") \
689 \
690 product(size_t, LargePageSizeInBytes, 0, \
691 "Large page size (0 to let VM choose the page size)") \
692 range(0, max_uintx) \
693 \
694 product(size_t, LargePageHeapSizeThreshold, 128*M, \
695 "Use large pages if maximum heap is at least this big") \
696 range(0, max_uintx) \
697 \
698 product(bool, ForceTimeHighResolution, false, \
699 "Using high time resolution (for Win32 only)") \
700 \
701 develop(bool, TracePcPatching, false, \
702 "Trace usage of frame::patch_pc") \
703 \
704 develop(bool, TraceRelocator, false, \
705 "Trace the bytecode relocator") \
706 \
707 develop(bool, TraceLongCompiles, false, \
708 "Print out every time compilation is longer than " \
709 "a given threshold") \
710 \
711 develop(bool, SafepointALot, false, \
712 "Generate a lot of safepoints. This works with " \
713 "GuaranteedSafepointInterval") \
714 \
715 product_pd(bool, BackgroundCompilation, \
716 "A thread requesting compilation is not blocked during " \
717 "compilation") \
718 \
719 product(bool, PrintVMQWaitTime, false, \
720 "Print out the waiting time in VM operation queue") \
721 \
722 product(bool, MethodFlushing, true, \
723 "Reclamation of zombie and not-entrant methods") \
724 \
725 develop(bool, VerifyStack, false, \
726 "Verify stack of each thread when it is entering a runtime call") \
727 \
728 diagnostic(bool, ForceUnreachable, false, \
729 "Make all non code cache addresses to be unreachable by " \
730 "forcing use of 64bit literal fixups") \
731 \
732 notproduct(bool, StressDerivedPointers, false, \
733 "Force scavenge when a derived pointer is detected on stack " \
734 "after rtm call") \
735 \
736 develop(bool, TraceDerivedPointers, false, \
737 "Trace traversal of derived pointers on stack") \
738 \
739 notproduct(bool, TraceCodeBlobStacks, false, \
740 "Trace stack-walk of codeblobs") \
741 \
742 product(bool, PrintJNIResolving, false, \
743 "Used to implement -v:jni") \
744 \
745 notproduct(bool, PrintRewrites, false, \
746 "Print methods that are being rewritten") \
747 \
748 product(bool, UseInlineCaches, true, \
749 "Use Inline Caches for virtual calls ") \
750 \
751 diagnostic(bool, InlineArrayCopy, true, \
752 "Inline arraycopy native that is known to be part of " \
753 "base library DLL") \
754 \
755 diagnostic(bool, InlineObjectHash, true, \
756 "Inline Object::hashCode() native that is known to be part " \
757 "of base library DLL") \
758 \
759 diagnostic(bool, InlineNatives, true, \
760 "Inline natives that are known to be part of base library DLL") \
761 \
762 diagnostic(bool, InlineMathNatives, true, \
763 "Inline SinD, CosD, etc.") \
764 \
765 diagnostic(bool, InlineClassNatives, true, \
766 "Inline Class.isInstance, etc") \
767 \
768 diagnostic(bool, InlineThreadNatives, true, \
769 "Inline Thread.currentThread, etc") \
770 \
771 diagnostic(bool, InlineUnsafeOps, true, \
772 "Inline memory ops (native methods) from Unsafe") \
773 \
774 product(bool, CriticalJNINatives, true, \
775 "Check for critical JNI entry points") \
776 \
777 notproduct(bool, StressCriticalJNINatives, false, \
778 "Exercise register saving code in critical natives") \
779 \
780 diagnostic(bool, UseAESIntrinsics, false, \
781 "Use intrinsics for AES versions of crypto") \
782 \
783 diagnostic(bool, UseAESCTRIntrinsics, false, \
784 "Use intrinsics for the paralleled version of AES/CTR crypto") \
785 \
786 diagnostic(bool, UseSHA1Intrinsics, false, \
787 "Use intrinsics for SHA-1 crypto hash function. " \
788 "Requires that UseSHA is enabled.") \
789 \
790 diagnostic(bool, UseSHA256Intrinsics, false, \
791 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
792 "Requires that UseSHA is enabled.") \
793 \
794 diagnostic(bool, UseSHA512Intrinsics, false, \
795 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
796 "Requires that UseSHA is enabled.") \
797 \
798 diagnostic(bool, UseCRC32Intrinsics, false, \
799 "use intrinsics for java.util.zip.CRC32") \
800 \
801 diagnostic(bool, UseCRC32CIntrinsics, false, \
802 "use intrinsics for java.util.zip.CRC32C") \
803 \
804 diagnostic(bool, UseAdler32Intrinsics, false, \
805 "use intrinsics for java.util.zip.Adler32") \
806 \
807 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
808 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
809 \
810 diagnostic(ccstrlist, DisableIntrinsic, "", \
811 "do not expand intrinsics whose (internal) names appear here") \
812 \
813 develop(bool, TraceCallFixup, false, \
814 "Trace all call fixups") \
815 \
816 develop(bool, DeoptimizeALot, false, \
817 "Deoptimize at every exit from the runtime system") \
818 \
819 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
820 "A comma separated list of bcis to deoptimize at") \
821 \
822 product(bool, DeoptimizeRandom, false, \
823 "Deoptimize random frames on random exit from the runtime system")\
824 \
825 notproduct(bool, ZombieALot, false, \
826 "Create zombies (non-entrant) at exit from the runtime system") \
827 \
828 product(bool, UnlinkSymbolsALot, false, \
829 "Unlink unreferenced symbols from the symbol table at safepoints")\
830 \
831 notproduct(bool, WalkStackALot, false, \
832 "Trace stack (no print) at every exit from the runtime system") \
833 \
834 product(bool, Debugging, false, \
835 "Set when executing debug methods in debug.cpp " \
836 "(to prevent triggering assertions)") \
837 \
838 notproduct(bool, StrictSafepointChecks, trueInDebug, \
839 "Enable strict checks that safepoints cannot happen for threads " \
840 "that use NoSafepointVerifier") \
841 \
842 notproduct(bool, VerifyLastFrame, false, \
843 "Verify oops on last frame on entry to VM") \
844 \
845 product(bool, FailOverToOldVerifier, true, \
846 "Fail over to old verifier when split verifier fails") \
847 \
848 product(bool, SafepointTimeout, false, \
849 "Time out and warn or fail after SafepointTimeoutDelay " \
850 "milliseconds if failed to reach safepoint") \
851 \
852 develop(bool, DieOnSafepointTimeout, false, \
853 "Die upon failure to reach safepoint (see SafepointTimeout)") \
854 \
855 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
856 /* typically, at most a few retries are needed */ \
857 product(intx, SuspendRetryCount, 50, \
858 "Maximum retry count for an external suspend request") \
859 range(0, max_intx) \
860 \
861 product(intx, SuspendRetryDelay, 5, \
862 "Milliseconds to delay per retry (* current_retry_count)") \
863 range(0, max_intx) \
864 \
865 product(bool, AssertOnSuspendWaitFailure, false, \
866 "Assert/Guarantee on external suspend wait failure") \
867 \
868 product(bool, TraceSuspendWaitFailures, false, \
869 "Trace external suspend wait failures") \
870 \
871 product(bool, MaxFDLimit, true, \
872 "Bump the number of file descriptors to maximum in Solaris") \
873 \
874 diagnostic(bool, LogEvents, true, \
875 "Enable the various ring buffer event logs") \
876 \
877 diagnostic(uintx, LogEventsBufferEntries, 10, \
878 "Number of ring buffer event logs") \
879 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
880 \
881 product(bool, BytecodeVerificationRemote, true, \
882 "Enable the Java bytecode verifier for remote classes") \
883 \
884 product(bool, BytecodeVerificationLocal, false, \
885 "Enable the Java bytecode verifier for local classes") \
886 \
887 develop(bool, ForceFloatExceptions, trueInDebug, \
888 "Force exceptions on FP stack under/overflow") \
889 \
890 develop(bool, VerifyStackAtCalls, false, \
891 "Verify that the stack pointer is unchanged after calls") \
892 \
893 develop(bool, TraceJavaAssertions, false, \
894 "Trace java language assertions") \
895 \
896 notproduct(bool, VerifyCodeCache, false, \
897 "Verify code cache on memory allocation/deallocation") \
898 \
899 develop(bool, UseMallocOnly, false, \
900 "Use only malloc/free for allocation (no resource area/arena)") \
901 \
902 develop(bool, PrintMallocStatistics, false, \
903 "Print malloc/free statistics") \
904 \
905 develop(bool, ZapResourceArea, trueInDebug, \
906 "Zap freed resource/arena space with 0xABABABAB") \
907 \
908 notproduct(bool, ZapVMHandleArea, trueInDebug, \
909 "Zap freed VM handle space with 0xBCBCBCBC") \
910 \
911 notproduct(bool, ZapStackSegments, trueInDebug, \
912 "Zap allocated/freed stack segments with 0xFADFADED") \
913 \
914 develop(bool, ZapUnusedHeapArea, trueInDebug, \
915 "Zap unused heap space with 0xBAADBABE") \
916 \
917 develop(bool, CheckZapUnusedHeapArea, false, \
918 "Check zapping of unused heap space") \
919 \
920 develop(bool, ZapFillerObjects, trueInDebug, \
921 "Zap filler objects with 0xDEAFBABE") \
922 \
923 develop(bool, PrintVMMessages, true, \
924 "Print VM messages on console") \
925 \
926 notproduct(uintx, ErrorHandlerTest, 0, \
927 "If > 0, provokes an error after VM initialization; the value " \
928 "determines which error to provoke. See test_error_handler() " \
929 "in vmError.cpp.") \
930 \
931 notproduct(uintx, TestCrashInErrorHandler, 0, \
932 "If > 0, provokes an error inside VM error handler (a secondary " \
933 "crash). see test_error_handler() in vmError.cpp") \
934 \
935 notproduct(bool, TestSafeFetchInErrorHandler, false, \
936 "If true, tests SafeFetch inside error handler.") \
937 \
938 notproduct(bool, TestUnresponsiveErrorHandler, false, \
939 "If true, simulates an unresponsive error handler.") \
940 \
941 develop(bool, Verbose, false, \
942 "Print additional debugging information from other modes") \
943 \
944 develop(bool, PrintMiscellaneous, false, \
945 "Print uncategorized debugging information (requires +Verbose)") \
946 \
947 develop(bool, WizardMode, false, \
948 "Print much more debugging information") \
949 \
950 product(bool, ShowMessageBoxOnError, false, \
951 "Keep process alive on VM fatal error") \
952 \
953 product(bool, CreateCoredumpOnCrash, true, \
954 "Create core/mini dump on VM fatal error") \
955 \
956 product(uint64_t, ErrorLogTimeout, 2 * 60, \
957 "Timeout, in seconds, to limit the time spent on writing an " \
958 "error log in case of a crash.") \
959 range(0, (uint64_t)max_jlong/1000) \
960 \
961 product_pd(bool, UseOSErrorReporting, \
962 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
963 \
964 product(bool, SuppressFatalErrorMessage, false, \
965 "Report NO fatal error message (avoid deadlock)") \
966 \
967 product(ccstrlist, OnError, "", \
968 "Run user-defined commands on fatal error; see VMError.cpp " \
969 "for examples") \
970 \
971 product(ccstrlist, OnOutOfMemoryError, "", \
972 "Run user-defined commands on first java.lang.OutOfMemoryError") \
973 \
974 manageable(bool, HeapDumpBeforeFullGC, false, \
975 "Dump heap to file before any major stop-the-world GC") \
976 \
977 manageable(bool, HeapDumpAfterFullGC, false, \
978 "Dump heap to file after any major stop-the-world GC") \
979 \
980 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
981 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
982 \
983 manageable(ccstr, HeapDumpPath, NULL, \
984 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
985 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
986 "in the working directory)") \
987 \
988 develop(bool, BreakAtWarning, false, \
989 "Execute breakpoint upon encountering VM warning") \
990 \
991 develop(bool, UseFakeTimers, false, \
992 "Tell whether the VM should use system time or a fake timer") \
993 \
994 product(ccstr, NativeMemoryTracking, "off", \
995 "Native memory tracking options") \
996 \
997 diagnostic(bool, PrintNMTStatistics, false, \
998 "Print native memory tracking summary data if it is on") \
999 \
1000 diagnostic(bool, LogCompilation, false, \
1001 "Log compilation activity in detail to LogFile") \
1002 \
1003 product(bool, PrintCompilation, false, \
1004 "Print compilations") \
1005 \
1006 diagnostic(bool, TraceNMethodInstalls, false, \
1007 "Trace nmethod installation") \
1008 \
1009 diagnostic(intx, ScavengeRootsInCode, 2, \
1010 "0: do not allow scavengable oops in the code cache; " \
1011 "1: allow scavenging from the code cache; " \
1012 "2: emit as many constants as the compiler can see") \
1013 range(0, 2) \
1014 \
1015 product(bool, AlwaysRestoreFPU, false, \
1016 "Restore the FPU control word after every JNI call (expensive)") \
1017 \
1018 diagnostic(bool, PrintCompilation2, false, \
1019 "Print additional statistics per compilation") \
1020 \
1021 diagnostic(bool, PrintAdapterHandlers, false, \
1022 "Print code generated for i2c/c2i adapters") \
1023 \
1024 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1025 "Verify that i2c/c2i adapters are called properly") \
1026 \
1027 develop(bool, VerifyAdapterSharing, false, \
1028 "Verify that the code for shared adapters is the equivalent") \
1029 \
1030 diagnostic(bool, PrintAssembly, false, \
1031 "Print assembly code (using external disassembler.so)") \
1032 \
1033 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1034 "Print options string passed to disassembler.so") \
1035 \
1036 notproduct(bool, PrintNMethodStatistics, false, \
1037 "Print a summary statistic for the generated nmethods") \
1038 \
1039 diagnostic(bool, PrintNMethods, false, \
1040 "Print assembly code for nmethods when generated") \
1041 \
1042 diagnostic(bool, PrintNativeNMethods, false, \
1043 "Print assembly code for native nmethods when generated") \
1044 \
1045 develop(bool, PrintDebugInfo, false, \
1046 "Print debug information for all nmethods when generated") \
1047 \
1048 develop(bool, PrintRelocations, false, \
1049 "Print relocation information for all nmethods when generated") \
1050 \
1051 develop(bool, PrintDependencies, false, \
1052 "Print dependency information for all nmethods when generated") \
1053 \
1054 develop(bool, PrintExceptionHandlers, false, \
1055 "Print exception handler tables for all nmethods when generated") \
1056 \
1057 develop(bool, StressCompiledExceptionHandlers, false, \
1058 "Exercise compiled exception handlers") \
1059 \
1060 develop(bool, InterceptOSException, false, \
1061 "Start debugger when an implicit OS (e.g. NULL) " \
1062 "exception happens") \
1063 \
1064 product(bool, PrintCodeCache, false, \
1065 "Print the code cache memory usage when exiting") \
1066 \
1067 develop(bool, PrintCodeCache2, false, \
1068 "Print detailed usage information on the code cache when exiting")\
1069 \
1070 product(bool, PrintCodeCacheOnCompilation, false, \
1071 "Print the code cache memory usage each time a method is " \
1072 "compiled") \
1073 \
1074 diagnostic(bool, PrintStubCode, false, \
1075 "Print generated stub code") \
1076 \
1077 product(bool, StackTraceInThrowable, true, \
1078 "Collect backtrace in throwable when exception happens") \
1079 \
1080 product(bool, OmitStackTraceInFastThrow, true, \
1081 "Omit backtraces for some 'hot' exceptions in optimized code") \
1082 \
1083 product(bool, ProfilerPrintByteCodeStatistics, false, \
1084 "Print bytecode statistics when dumping profiler output") \
1085 \
1086 product(bool, ProfilerRecordPC, false, \
1087 "Collect ticks for each 16 byte interval of compiled code") \
1088 \
1089 product(bool, ProfileVM, false, \
1090 "Profile ticks that fall within VM (either in the VM Thread " \
1091 "or VM code called through stubs)") \
1092 \
1093 product(bool, ProfileIntervals, false, \
1094 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1095 \
1096 notproduct(bool, ProfilerCheckIntervals, false, \
1097 "Collect and print information on spacing of profiler ticks") \
1098 \
1099 product(bool, PrintWarnings, true, \
1100 "Print JVM warnings to output stream") \
1101 \
1102 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1103 "Print warnings for stalled SpinLocks") \
1104 \
1105 product(bool, RegisterFinalizersAtInit, true, \
1106 "Register finalizable objects at end of Object.<init> or " \
1107 "after allocation") \
1108 \
1109 develop(bool, RegisterReferences, true, \
1110 "Tell whether the VM should register soft/weak/final/phantom " \
1111 "references") \
1112 \
1113 develop(bool, IgnoreRewrites, false, \
1114 "Suppress rewrites of bytecodes in the oopmap generator. " \
1115 "This is unsafe!") \
1116 \
1117 develop(bool, PrintCodeCacheExtension, false, \
1118 "Print extension of code cache") \
1119 \
1120 develop(bool, UsePrivilegedStack, true, \
1121 "Enable the security JVM functions") \
1122 \
1123 develop(bool, ProtectionDomainVerification, true, \
1124 "Verify protection domain before resolution in system dictionary")\
1125 \
1126 product(bool, ClassUnloading, true, \
1127 "Do unloading of classes") \
1128 \
1129 product(bool, ClassUnloadingWithConcurrentMark, true, \
1130 "Do unloading of classes with a concurrent marking cycle") \
1131 \
1132 develop(bool, DisableStartThread, false, \
1133 "Disable starting of additional Java threads " \
1134 "(for debugging only)") \
1135 \
1136 develop(bool, MemProfiling, false, \
1137 "Write memory usage profiling to log file") \
1138 \
1139 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1140 "Print the system dictionary at exit") \
1141 \
1142 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \
1143 "Dynamically resize system dictionaries as needed") \
1144 \
1145 product(bool, AlwaysLockClassLoader, false, \
1146 "Require the VM to acquire the class loader lock before calling " \
1147 "loadClass() even for class loaders registering " \
1148 "as parallel capable") \
1149 \
1150 product(bool, AllowParallelDefineClass, false, \
1151 "Allow parallel defineClass requests for class loaders " \
1152 "registering as parallel capable") \
1153 \
1154 product_pd(bool, DontYieldALot, \
1155 "Throw away obvious excess yield calls") \
1156 \
1157 develop(bool, UseDetachedThreads, true, \
1158 "Use detached threads that are recycled upon termination " \
1159 "(for Solaris only)") \
1160 \
1161 experimental(bool, DisablePrimordialThreadGuardPages, false, \
1162 "Disable the use of stack guard pages if the JVM is loaded " \
1163 "on the primordial process thread") \
1164 \
1165 product(bool, UseLWPSynchronization, true, \
1166 "Use LWP-based instead of libthread-based synchronization " \
1167 "(SPARC only)") \
1168 \
1169 experimental(ccstr, SyncKnobs, NULL, \
1170 "(Unstable) Various monitor synchronization tunables") \
1171 \
1172 experimental(intx, EmitSync, 0, \
1173 "(Unsafe, Unstable) " \
1174 "Control emission of inline sync fast-path code") \
1175 \
1176 product(intx, MonitorBound, 0, "Bound Monitor population") \
1177 range(0, max_jint) \
1178 \
1179 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \
1180 \
1181 experimental(intx, MonitorUsedDeflationThreshold, 90, \
1182 "Percentage of used monitors before triggering cleanup " \
1183 "safepoint which deflates monitors (0 is off). " \
1184 "The check is performed on GuaranteedSafepointInterval.") \
1185 range(0, 100) \
1186 \
1187 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1188 "Experimental Sync flags") \
1189 \
1190 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1191 \
1192 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1193 \
1194 experimental(intx, hashCode, 5, \
1195 "(Unstable) select hashCode generation algorithm") \
1196 \
1197 product(bool, FilterSpuriousWakeups, true, \
1198 "When true prevents OS-level spurious, or premature, wakeups " \
1199 "from Object.wait (Ignored for Windows)") \
1200 \
1201 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1202 \
1203 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1204 \
1205 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1206 \
1207 develop(bool, UsePthreads, false, \
1208 "Use pthread-based instead of libthread-based synchronization " \
1209 "(SPARC only)") \
1210 \
1211 product(bool, ReduceSignalUsage, false, \
1212 "Reduce the use of OS signals in Java and/or the VM") \
1213 \
1214 develop_pd(bool, ShareVtableStubs, \
1215 "Share vtable stubs (smaller code but worse branch prediction") \
1216 \
1217 develop(bool, LoadLineNumberTables, true, \
1218 "Tell whether the class file parser loads line number tables") \
1219 \
1220 develop(bool, LoadLocalVariableTables, true, \
1221 "Tell whether the class file parser loads local variable tables") \
1222 \
1223 develop(bool, LoadLocalVariableTypeTables, true, \
1224 "Tell whether the class file parser loads local variable type" \
1225 "tables") \
1226 \
1227 product(bool, AllowUserSignalHandlers, false, \
1228 "Do not complain if the application installs signal handlers " \
1229 "(Solaris & Linux only)") \
1230 \
1231 product(bool, UseSignalChaining, true, \
1232 "Use signal-chaining to invoke signal handlers installed " \
1233 "by the application (Solaris & Linux only)") \
1234 \
1235 product(bool, AllowJNIEnvProxy, false, \
1236 "Allow JNIEnv proxies for jdbx") \
1237 \
1238 product(bool, RestoreMXCSROnJNICalls, false, \
1239 "Restore MXCSR when returning from JNI calls") \
1240 \
1241 product(bool, CheckJNICalls, false, \
1242 "Verify all arguments to JNI calls") \
1243 \
1244 product(bool, UseFastJNIAccessors, true, \
1245 "Use optimized versions of Get<Primitive>Field") \
1246 \
1247 product(intx, MaxJNILocalCapacity, 65536, \
1248 "Maximum allowable local JNI handle capacity to " \
1249 "EnsureLocalCapacity() and PushLocalFrame(), " \
1250 "where <= 0 is unlimited, default: 65536") \
1251 range(min_intx, max_intx) \
1252 \
1253 product(bool, EagerXrunInit, false, \
1254 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1255 "but not all -Xrun libraries may support the state of the VM " \
1256 "at this time") \
1257 \
1258 product(bool, PreserveAllAnnotations, false, \
1259 "Preserve RuntimeInvisibleAnnotations as well " \
1260 "as RuntimeVisibleAnnotations") \
1261 \
1262 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1263 "Number of OutOfMemoryErrors preallocated with backtrace") \
1264 \
1265 product(bool, UseXMMForArrayCopy, false, \
1266 "Use SSE2 MOVQ instruction for Arraycopy") \
1267 \
1268 product(intx, FieldsAllocationStyle, 1, \
1269 "0 - type based with oops first, " \
1270 "1 - with oops last, " \
1271 "2 - oops in super and sub classes are together") \
1272 range(0, 2) \
1273 \
1274 product(bool, CompactFields, true, \
1275 "Allocate nonstatic fields in gaps between previous fields") \
1276 \
1277 notproduct(bool, PrintFieldLayout, false, \
1278 "Print field layout for each class") \
1279 \
1280 /* Need to limit the extent of the padding to reasonable size. */\
1281 /* 8K is well beyond the reasonable HW cache line size, even with */\
1282 /* aggressive prefetching, while still leaving the room for segregating */\
1283 /* among the distinct pages. */\
1284 product(intx, ContendedPaddingWidth, 128, \
1285 "How many bytes to pad the fields/classes marked @Contended with")\
1286 range(0, 8192) \
1287 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1288 \
1289 product(bool, EnableContended, true, \
1290 "Enable @Contended annotation support") \
1291 \
1292 product(bool, RestrictContended, true, \
1293 "Restrict @Contended to trusted classes") \
1294 \
1295 product(bool, UseBiasedLocking, true, \
1296 "Enable biased locking in JVM") \
1297 \
1298 product(intx, BiasedLockingStartupDelay, 0, \
1299 "Number of milliseconds to wait before enabling biased locking") \
1300 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1301 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1302 \
1303 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1304 "Print statistics of biased locking in JVM") \
1305 \
1306 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1307 "Threshold of number of revocations per type to try to " \
1308 "rebias all objects in the heap of that type") \
1309 range(0, max_intx) \
1310 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1311 \
1312 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1313 "Threshold of number of revocations per type to permanently " \
1314 "revoke biases of all objects in the heap of that type") \
1315 range(0, max_intx) \
1316 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1317 \
1318 product(intx, BiasedLockingDecayTime, 25000, \
1319 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1320 "type after previous bulk rebias") \
1321 range(500, max_intx) \
1322 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1323 \
1324 product(bool, ExitOnOutOfMemoryError, false, \
1325 "JVM exits on the first occurrence of an out-of-memory error") \
1326 \
1327 product(bool, CrashOnOutOfMemoryError, false, \
1328 "JVM aborts, producing an error log and core/mini dump, on the " \
1329 "first occurrence of an out-of-memory error") \
1330 \
1331 /* tracing */ \
1332 \
1333 develop(bool, StressRewriter, false, \
1334 "Stress linktime bytecode rewriting") \
1335 \
1336 product(ccstr, TraceJVMTI, NULL, \
1337 "Trace flags for JVMTI functions and events") \
1338 \
1339 /* This option can change an EMCP method into an obsolete method. */ \
1340 /* This can affect tests that except specific methods to be EMCP. */ \
1341 /* This option should be used with caution. */ \
1342 product(bool, StressLdcRewrite, false, \
1343 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1344 \
1345 /* change to false by default sometime after Mustang */ \
1346 product(bool, VerifyMergedCPBytecodes, true, \
1347 "Verify bytecodes after RedefineClasses constant pool merging") \
1348 \
1349 develop(bool, TraceBytecodes, false, \
1350 "Trace bytecode execution") \
1351 \
1352 develop(bool, TraceICs, false, \
1353 "Trace inline cache changes") \
1354 \
1355 notproduct(bool, TraceInvocationCounterOverflow, false, \
1356 "Trace method invocation counter overflow") \
1357 \
1358 develop(bool, TraceInlineCacheClearing, false, \
1359 "Trace clearing of inline caches in nmethods") \
1360 \
1361 develop(bool, TraceDependencies, false, \
1362 "Trace dependencies") \
1363 \
1364 develop(bool, VerifyDependencies, trueInDebug, \
1365 "Exercise and verify the compilation dependency mechanism") \
1366 \
1367 develop(bool, TraceNewOopMapGeneration, false, \
1368 "Trace OopMapGeneration") \
1369 \
1370 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1371 "Trace OopMapGeneration: print detailed cell states") \
1372 \
1373 develop(bool, TimeOopMap, false, \
1374 "Time calls to GenerateOopMap::compute_map() in sum") \
1375 \
1376 develop(bool, TimeOopMap2, false, \
1377 "Time calls to GenerateOopMap::compute_map() individually") \
1378 \
1379 develop(bool, TraceOopMapRewrites, false, \
1380 "Trace rewriting of method oops during oop map generation") \
1381 \
1382 develop(bool, TraceICBuffer, false, \
1383 "Trace usage of IC buffer") \
1384 \
1385 develop(bool, TraceCompiledIC, false, \
1386 "Trace changes of compiled IC") \
1387 \
1388 /* gc */ \
1389 \
1390 product(bool, UseSerialGC, false, \
1391 "Use the Serial garbage collector") \
1392 \
1393 product(bool, UseG1GC, false, \
1394 "Use the Garbage-First garbage collector") \
1395 \
1396 product(bool, UseParallelGC, false, \
1397 "Use the Parallel Scavenge garbage collector") \
1398 \
1399 product(bool, UseParallelOldGC, false, \
1400 "Use the Parallel Old garbage collector") \
1401 \
1402 product(uintx, HeapMaximumCompactionInterval, 20, \
1403 "How often should we maximally compact the heap (not allowing " \
1404 "any dead space)") \
1405 range(0, max_uintx) \
1406 \
1407 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1408 "The collection count for the first maximum compaction") \
1409 range(0, max_uintx) \
1410 \
1411 product(bool, UseMaximumCompactionOnSystemGC, true, \
1412 "Use maximum compaction in the Parallel Old garbage collector " \
1413 "for a system GC") \
1414 \
1415 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1416 "The mean used by the parallel compact dead wood " \
1417 "limiter (a number between 0-100)") \
1418 range(0, 100) \
1419 \
1420 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1421 "The standard deviation used by the parallel compact dead wood " \
1422 "limiter (a number between 0-100)") \
1423 range(0, 100) \
1424 \
1425 product(uint, ParallelGCThreads, 0, \
1426 "Number of parallel threads parallel gc will use") \
1427 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1428 \
1429 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1430 "Use semaphore synchronization for the GC Threads, " \
1431 "instead of synchronization based on mutexes") \
1432 \
1433 product(bool, UseDynamicNumberOfGCThreads, true, \
1434 "Dynamically choose the number of threads up to a maximum of " \
1435 "ParallelGCThreads parallel collectors will use for garbage " \
1436 "collection work") \
1437 \
1438 diagnostic(bool, InjectGCWorkerCreationFailure, false, \
1439 "Inject thread creation failures for " \
1440 "UseDynamicNumberOfGCThreads") \
1441 \
1442 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1443 "Force dynamic selection of the number of " \
1444 "parallel threads parallel gc will use to aid debugging") \
1445 \
1446 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1447 "Size of heap (bytes) per GC thread used in calculating the " \
1448 "number of GC threads") \
1449 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1450 \
1451 product(uint, ConcGCThreads, 0, \
1452 "Number of threads concurrent gc will use") \
1453 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1454 \
1455 product(uint, GCTaskTimeStampEntries, 200, \
1456 "Number of time stamp entries per gc worker thread") \
1457 range(1, max_jint) \
1458 \
1459 product(bool, AlwaysTenure, false, \
1460 "Always tenure objects in eden (ParallelGC only)") \
1461 \
1462 product(bool, NeverTenure, false, \
1463 "Never tenure objects in eden, may tenure on overflow " \
1464 "(ParallelGC only)") \
1465 \
1466 product(bool, ScavengeBeforeFullGC, true, \
1467 "Scavenge youngest generation before each full GC.") \
1468 \
1469 product(bool, UseConcMarkSweepGC, false, \
1470 "Use Concurrent Mark-Sweep GC in the old generation") \
1471 \
1472 product(bool, ExplicitGCInvokesConcurrent, false, \
1473 "A System.gc() request invokes a concurrent collection; " \
1474 "(effective only when using concurrent collectors)") \
1475 \
1476 product(bool, GCLockerInvokesConcurrent, false, \
1477 "The exit of a JNI critical section necessitating a scavenge, " \
1478 "also kicks off a background concurrent collection") \
1479 \
1480 product(uintx, GCLockerEdenExpansionPercent, 5, \
1481 "How much the GC can expand the eden by while the GC locker " \
1482 "is active (as a percentage)") \
1483 range(0, 100) \
1484 \
1485 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1486 "Number of times to retry allocations when " \
1487 "blocked by the GC locker") \
1488 range(0, max_uintx) \
1489 \
1490 product(bool, UseCMSBestFit, true, \
1491 "Use CMS best fit allocation strategy") \
1492 \
1493 product(uintx, ParallelGCBufferWastePct, 10, \
1494 "Wasted fraction of parallel allocation buffer") \
1495 range(0, 100) \
1496 \
1497 product(uintx, TargetPLABWastePct, 10, \
1498 "Target wasted space in last buffer as percent of overall " \
1499 "allocation") \
1500 range(1, 100) \
1501 \
1502 product(uintx, PLABWeight, 75, \
1503 "Percentage (0-100) used to weight the current sample when " \
1504 "computing exponentially decaying average for ResizePLAB") \
1505 range(0, 100) \
1506 \
1507 product(bool, ResizePLAB, true, \
1508 "Dynamically resize (survivor space) promotion LAB's") \
1509 \
1510 product(int, ParGCArrayScanChunk, 50, \
1511 "Scan a subset of object array and push remainder, if array is " \
1512 "bigger than this") \
1513 range(1, max_jint/3) \
1514 \
1515 product(bool, ParGCUseLocalOverflow, false, \
1516 "Instead of a global overflow list, use local overflow stacks") \
1517 \
1518 product(bool, ParGCTrimOverflow, true, \
1519 "Eagerly trim the local overflow lists " \
1520 "(when ParGCUseLocalOverflow)") \
1521 \
1522 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1523 "Simulate work queue overflow in ParNew") \
1524 \
1525 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1526 "An `interval' counter that determines how frequently " \
1527 "we simulate overflow; a smaller number increases frequency") \
1528 \
1529 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1530 "The desired number of objects to claim from the overflow list") \
1531 range(0, max_uintx) \
1532 \
1533 diagnostic(uintx, ParGCStridesPerThread, 2, \
1534 "The number of strides per worker thread that we divide up the " \
1535 "card table scanning work into") \
1536 range(1, max_uintx) \
1537 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1538 \
1539 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1540 "The number of cards in each chunk of the parallel chunks used " \
1541 "during card table scanning") \
1542 range(1, max_intx) \
1543 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1544 \
1545 product(uintx, OldPLABWeight, 50, \
1546 "Percentage (0-100) used to weight the current sample when " \
1547 "computing exponentially decaying average for resizing " \
1548 "OldPLABSize") \
1549 range(0, 100) \
1550 \
1551 product(bool, ResizeOldPLAB, true, \
1552 "Dynamically resize (old gen) promotion LAB's") \
1553 \
1554 product(size_t, CMSOldPLABMax, 1024, \
1555 "Maximum size of CMS gen promotion LAB caches per worker " \
1556 "per block size") \
1557 range(1, max_uintx) \
1558 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1559 \
1560 product(size_t, CMSOldPLABMin, 16, \
1561 "Minimum size of CMS gen promotion LAB caches per worker " \
1562 "per block size") \
1563 range(1, max_uintx) \
1564 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1565 \
1566 product(uintx, CMSOldPLABNumRefills, 4, \
1567 "Nominal number of refills of CMS gen promotion LAB cache " \
1568 "per worker per block size") \
1569 range(1, max_uintx) \
1570 \
1571 product(bool, CMSOldPLABResizeQuicker, false, \
1572 "React on-the-fly during a scavenge to a sudden " \
1573 "change in block demand rate") \
1574 \
1575 product(uintx, CMSOldPLABToleranceFactor, 4, \
1576 "The tolerance of the phase-change detector for on-the-fly " \
1577 "PLAB resizing during a scavenge") \
1578 range(1, max_uintx) \
1579 \
1580 product(uintx, CMSOldPLABReactivityFactor, 2, \
1581 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1582 "during a scavenge") \
1583 range(1, max_uintx) \
1584 \
1585 product(bool, AlwaysPreTouch, false, \
1586 "Force all freshly committed pages to be pre-touched") \
1587 \
1588 product(size_t, PreTouchParallelChunkSize, 1 * G, \
1589 "Per-thread chunk size for parallel memory pre-touch.") \
1590 range(1, SIZE_MAX / 2) \
1591 \
1592 product_pd(size_t, CMSYoungGenPerWorker, \
1593 "The maximum size of young gen chosen by default per GC worker " \
1594 "thread available") \
1595 range(1, max_uintx) \
1596 \
1597 product(uintx, CMSIncrementalSafetyFactor, 10, \
1598 "Percentage (0-100) used to add conservatism when computing the " \
1599 "duty cycle") \
1600 range(0, 100) \
1601 \
1602 product(uintx, CMSExpAvgFactor, 50, \
1603 "Percentage (0-100) used to weight the current sample when " \
1604 "computing exponential averages for CMS statistics") \
1605 range(0, 100) \
1606 \
1607 product(uintx, CMS_FLSWeight, 75, \
1608 "Percentage (0-100) used to weight the current sample when " \
1609 "computing exponentially decaying averages for CMS FLS " \
1610 "statistics") \
1611 range(0, 100) \
1612 \
1613 product(uintx, CMS_FLSPadding, 1, \
1614 "The multiple of deviation from mean to use for buffering " \
1615 "against volatility in free list demand") \
1616 range(0, max_juint) \
1617 \
1618 product(uintx, FLSCoalescePolicy, 2, \
1619 "CMS: aggressiveness level for coalescing, increasing " \
1620 "from 0 to 4") \
1621 range(0, 4) \
1622 \
1623 product(bool, FLSAlwaysCoalesceLarge, false, \
1624 "CMS: larger free blocks are always available for coalescing") \
1625 \
1626 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1627 "CMS: the smaller the percentage the greater the coalescing " \
1628 "force") \
1629 range(0.0, 1.0) \
1630 \
1631 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1632 "CMS: the factor by which to inflate estimated demand of small " \
1633 "block sizes to prevent coalescing with an adjoining block") \
1634 range(0.0, DBL_MAX) \
1635 \
1636 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1637 "CMS: the factor by which to inflate estimated demand of large " \
1638 "block sizes to prevent coalescing with an adjoining block") \
1639 range(0.0, DBL_MAX) \
1640 \
1641 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1642 "CMS: the factor by which to inflate estimated demand of small " \
1643 "block sizes to prevent splitting to supply demand for smaller " \
1644 "blocks") \
1645 range(0.0, DBL_MAX) \
1646 \
1647 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1648 "CMS: the factor by which to inflate estimated demand of large " \
1649 "block sizes to prevent splitting to supply demand for smaller " \
1650 "blocks") \
1651 range(0.0, DBL_MAX) \
1652 \
1653 product(bool, CMSExtrapolateSweep, false, \
1654 "CMS: cushion for block demand during sweep") \
1655 \
1656 product(uintx, CMS_SweepWeight, 75, \
1657 "Percentage (0-100) used to weight the current sample when " \
1658 "computing exponentially decaying average for inter-sweep " \
1659 "duration") \
1660 range(0, 100) \
1661 \
1662 product(uintx, CMS_SweepPadding, 1, \
1663 "The multiple of deviation from mean to use for buffering " \
1664 "against volatility in inter-sweep duration") \
1665 range(0, max_juint) \
1666 \
1667 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1668 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1669 "duration exceeds this threshold in milliseconds") \
1670 range(0, max_uintx) \
1671 \
1672 product(bool, CMSClassUnloadingEnabled, true, \
1673 "Whether class unloading enabled when using CMS GC") \
1674 \
1675 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1676 "When CMS class unloading is enabled, the maximum CMS cycle " \
1677 "count for which classes may not be unloaded") \
1678 range(0, max_uintx) \
1679 \
1680 product(uintx, CMSIndexedFreeListReplenish, 4, \
1681 "Replenish an indexed free list with this number of chunks") \
1682 range(1, max_uintx) \
1683 \
1684 product(bool, CMSReplenishIntermediate, true, \
1685 "Replenish all intermediate free-list caches") \
1686 \
1687 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1688 "When satisfying batched demand, split blocks from the " \
1689 "IndexedFreeList whose size is a multiple of requested size") \
1690 \
1691 product(bool, CMSLoopWarn, false, \
1692 "Warn in case of excessive CMS looping") \
1693 \
1694 /* where does the range max value of (max_jint - 1) come from? */ \
1695 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1696 "Maximum size of marking stack") \
1697 range(1, (max_jint - 1)) \
1698 \
1699 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1700 "Size of marking stack") \
1701 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1702 \
1703 notproduct(bool, CMSMarkStackOverflowALot, false, \
1704 "Simulate frequent marking stack / work queue overflow") \
1705 \
1706 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1707 "An \"interval\" counter that determines how frequently " \
1708 "to simulate overflow; a smaller number increases frequency") \
1709 \
1710 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1711 "Maximum number of abortable preclean iterations, if > 0") \
1712 range(0, max_uintx) \
1713 \
1714 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1715 "Maximum time in abortable preclean (in milliseconds)") \
1716 range(0, max_intx) \
1717 \
1718 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1719 "Nominal minimum work per abortable preclean iteration") \
1720 range(0, max_uintx) \
1721 \
1722 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1723 "Time that we sleep between iterations when not given " \
1724 "enough work per iteration") \
1725 range(0, max_intx) \
1726 \
1727 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \
1728 product(size_t, CMSRescanMultiple, 32, \
1729 "Size (in cards) of CMS parallel rescan task") \
1730 range(1, SIZE_MAX / 4096) \
1731 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \
1732 \
1733 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \
1734 product(size_t, CMSConcMarkMultiple, 32, \
1735 "Size (in cards) of CMS concurrent MT marking task") \
1736 range(1, SIZE_MAX / 4096) \
1737 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \
1738 \
1739 product(bool, CMSAbortSemantics, false, \
1740 "Whether abort-on-overflow semantics is implemented") \
1741 \
1742 product(bool, CMSParallelInitialMarkEnabled, true, \
1743 "Use the parallel initial mark.") \
1744 \
1745 product(bool, CMSParallelRemarkEnabled, true, \
1746 "Whether parallel remark enabled (only if ParNewGC)") \
1747 \
1748 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1749 "Whether parallel remark of survivor space " \
1750 "enabled (effective only if CMSParallelRemarkEnabled)") \
1751 \
1752 product(bool, CMSPLABRecordAlways, true, \
1753 "Always record survivor space PLAB boundaries (effective only " \
1754 "if CMSParallelSurvivorRemarkEnabled)") \
1755 \
1756 product(bool, CMSEdenChunksRecordAlways, true, \
1757 "Always record eden chunks used for the parallel initial mark " \
1758 "or remark of eden") \
1759 \
1760 product(bool, CMSConcurrentMTEnabled, true, \
1761 "Whether multi-threaded concurrent work enabled " \
1762 "(effective only if ParNewGC)") \
1763 \
1764 product(bool, CMSPrecleaningEnabled, true, \
1765 "Whether concurrent precleaning enabled") \
1766 \
1767 product(uintx, CMSPrecleanIter, 3, \
1768 "Maximum number of precleaning iteration passes") \
1769 range(0, 9) \
1770 \
1771 product(uintx, CMSPrecleanDenominator, 3, \
1772 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1773 "ratio") \
1774 range(1, max_uintx) \
1775 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1776 \
1777 product(uintx, CMSPrecleanNumerator, 2, \
1778 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1779 "ratio") \
1780 range(0, max_uintx-1) \
1781 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1782 \
1783 product(bool, CMSPrecleanRefLists1, true, \
1784 "Preclean ref lists during (initial) preclean phase") \
1785 \
1786 product(bool, CMSPrecleanRefLists2, false, \
1787 "Preclean ref lists during abortable preclean phase") \
1788 \
1789 product(bool, CMSPrecleanSurvivors1, false, \
1790 "Preclean survivors during (initial) preclean phase") \
1791 \
1792 product(bool, CMSPrecleanSurvivors2, true, \
1793 "Preclean survivors during abortable preclean phase") \
1794 \
1795 product(uintx, CMSPrecleanThreshold, 1000, \
1796 "Do not iterate again if number of dirty cards is less than this")\
1797 range(100, max_uintx) \
1798 \
1799 product(bool, CMSCleanOnEnter, true, \
1800 "Clean-on-enter optimization for reducing number of dirty cards") \
1801 \
1802 product(uintx, CMSRemarkVerifyVariant, 1, \
1803 "Choose variant (1,2) of verification following remark") \
1804 range(1, 2) \
1805 \
1806 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1807 "If Eden size is below this, do not try to schedule remark") \
1808 range(0, max_uintx) \
1809 \
1810 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1811 "The Eden occupancy percentage (0-100) at which " \
1812 "to try and schedule remark pause") \
1813 range(0, 100) \
1814 \
1815 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1816 "Start sampling eden top at least before young gen " \
1817 "occupancy reaches 1/<ratio> of the size at which " \
1818 "we plan to schedule remark") \
1819 range(1, max_uintx) \
1820 \
1821 product(uintx, CMSSamplingGrain, 16*K, \
1822 "The minimum distance between eden samples for CMS (see above)") \
1823 range(ObjectAlignmentInBytes, max_uintx) \
1824 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \
1825 \
1826 product(bool, CMSScavengeBeforeRemark, false, \
1827 "Attempt scavenge before the CMS remark step") \
1828 \
1829 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1830 "Don't drain below this size per parallel worker/thief") \
1831 range(1, max_juint) \
1832 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1833 \
1834 manageable(intx, CMSWaitDuration, 2000, \
1835 "Time in milliseconds that CMS thread waits for young GC") \
1836 range(min_jint, max_jint) \
1837 \
1838 develop(uintx, CMSCheckInterval, 1000, \
1839 "Interval in milliseconds that CMS thread checks if it " \
1840 "should start a collection cycle") \
1841 \
1842 product(bool, CMSYield, true, \
1843 "Yield between steps of CMS") \
1844 \
1845 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1846 "Bitmap operations should process at most this many bits " \
1847 "between yields") \
1848 range(1, max_uintx) \
1849 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \
1850 \
1851 product(bool, CMSPrintChunksInDump, false, \
1852 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1853 "trace level include more detailed information about the" \
1854 "free chunks") \
1855 \
1856 product(bool, CMSPrintObjectsInDump, false, \
1857 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1858 "trace level include more detailed information about the" \
1859 "allocated objects") \
1860 \
1861 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1862 "Verify that all references across the FLS boundary " \
1863 "are to valid objects") \
1864 \
1865 diagnostic(bool, FLSVerifyLists, false, \
1866 "Do lots of (expensive) FreeListSpace verification") \
1867 \
1868 diagnostic(bool, FLSVerifyIndexTable, false, \
1869 "Do lots of (expensive) FLS index table verification") \
1870 \
1871 develop(bool, FLSVerifyDictionary, false, \
1872 "Do lots of (expensive) FLS dictionary verification") \
1873 \
1874 develop(bool, VerifyBlockOffsetArray, false, \
1875 "Do (expensive) block offset array verification") \
1876 \
1877 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1878 "Maintain _unallocated_block in BlockOffsetArray " \
1879 "(currently applicable only to CMS collector)") \
1880 \
1881 product(intx, RefDiscoveryPolicy, 0, \
1882 "Select type of reference discovery policy: " \
1883 "reference-based(0) or referent-based(1)") \
1884 range(ReferenceProcessor::DiscoveryPolicyMin, \
1885 ReferenceProcessor::DiscoveryPolicyMax) \
1886 \
1887 product(bool, ParallelRefProcEnabled, false, \
1888 "Enable parallel reference processing whenever possible") \
1889 \
1890 product(bool, ParallelRefProcBalancingEnabled, true, \
1891 "Enable balancing of reference processing queues") \
1892 \
1893 product(uintx, CMSTriggerRatio, 80, \
1894 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1895 "allocated before a CMS collection cycle commences") \
1896 range(0, 100) \
1897 \
1898 product(uintx, CMSBootstrapOccupancy, 50, \
1899 "Percentage CMS generation occupancy at which to " \
1900 "initiate CMS collection for bootstrapping collection stats") \
1901 range(0, 100) \
1902 \
1903 product(intx, CMSInitiatingOccupancyFraction, -1, \
1904 "Percentage CMS generation occupancy to start a CMS collection " \
1905 "cycle. A negative value means that CMSTriggerRatio is used") \
1906 range(min_intx, 100) \
1907 \
1908 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1909 "The percent occupancy (IHOP) of the current old generation " \
1910 "capacity above which a concurrent mark cycle will be initiated " \
1911 "Its value may change over time if adaptive IHOP is enabled, " \
1912 "otherwise the value remains constant. " \
1913 "In the latter case a value of 0 will result as frequent as " \
1914 "possible concurrent marking cycles. A value of 100 disables " \
1915 "concurrent marking. " \
1916 "Fragmentation waste in the old generation is not considered " \
1917 "free space in this calculation. (G1 collector only)") \
1918 range(0, 100) \
1919 \
1920 manageable(intx, CMSTriggerInterval, -1, \
1921 "Commence a CMS collection cycle (at least) every so many " \
1922 "milliseconds (0 permanently, -1 disabled)") \
1923 range(-1, max_intx) \
1924 \
1925 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1926 "Only use occupancy as a criterion for starting a CMS collection")\
1927 \
1928 product(uintx, CMSIsTooFullPercentage, 98, \
1929 "An absolute ceiling above which CMS will always consider the " \
1930 "unloading of classes when class unloading is enabled") \
1931 range(0, 100) \
1932 \
1933 develop(bool, CMSTestInFreeList, false, \
1934 "Check if the coalesced range is already in the " \
1935 "free lists as claimed") \
1936 \
1937 notproduct(bool, CMSVerifyReturnedBytes, false, \
1938 "Check that all the garbage collected was returned to the " \
1939 "free lists") \
1940 \
1941 notproduct(bool, ScavengeALot, false, \
1942 "Force scavenge at every Nth exit from the runtime system " \
1943 "(N=ScavengeALotInterval)") \
1944 \
1945 develop(bool, FullGCALot, false, \
1946 "Force full gc at every Nth exit from the runtime system " \
1947 "(N=FullGCALotInterval)") \
1948 \
1949 notproduct(bool, GCALotAtAllSafepoints, false, \
1950 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1951 \
1952 notproduct(bool, PromotionFailureALot, false, \
1953 "Use promotion failure handling on every youngest generation " \
1954 "collection") \
1955 \
1956 develop(uintx, PromotionFailureALotCount, 1000, \
1957 "Number of promotion failures occurring at PLAB " \
1958 "refill attempts (ParNew) or promotion attempts " \
1959 "(other young collectors)") \
1960 \
1961 develop(uintx, PromotionFailureALotInterval, 5, \
1962 "Total collections between promotion failures a lot") \
1963 \
1964 experimental(uintx, WorkStealingSleepMillis, 1, \
1965 "Sleep time when sleep is used for yields") \
1966 \
1967 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1968 "Number of yields before a sleep is done during work stealing") \
1969 \
1970 experimental(uintx, WorkStealingHardSpins, 4096, \
1971 "Number of iterations in a spin loop between checks on " \
1972 "time out of hard spin") \
1973 \
1974 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1975 "Ratio of hard spins to calls to yield") \
1976 \
1977 develop(uintx, ObjArrayMarkingStride, 2048, \
1978 "Number of object array elements to push onto the marking stack " \
1979 "before pushing a continuation entry") \
1980 \
1981 develop(bool, MetadataAllocationFailALot, false, \
1982 "Fail metadata allocations at intervals controlled by " \
1983 "MetadataAllocationFailALotInterval") \
1984 \
1985 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1986 "Metadata allocation failure a lot interval") \
1987 \
1988 notproduct(bool, ExecuteInternalVMTests, false, \
1989 "Enable execution of internal VM tests") \
1990 \
1991 notproduct(bool, VerboseInternalVMTests, false, \
1992 "Turn on logging for internal VM tests.") \
1993 \
1994 product(bool, ExecutingUnitTests, false, \
1995 "Whether the JVM is running unit tests or not") \
1996 \
1997 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1998 \
1999 product_pd(bool, ResizeTLAB, \
2000 "Dynamically resize TLAB size for threads") \
2001 \
2002 product(bool, ZeroTLAB, false, \
2003 "Zero out the newly created TLAB") \
2004 \
2005 product(bool, TLABStats, true, \
2006 "Provide more detailed and expensive TLAB statistics.") \
2007 \
2008 product_pd(bool, NeverActAsServerClassMachine, \
2009 "Never act like a server-class machine") \
2010 \
2011 product(bool, AlwaysActAsServerClassMachine, false, \
2012 "Always act like a server-class machine") \
2013 \
2014 product_pd(uint64_t, MaxRAM, \
2015 "Real memory size (in bytes) used to set maximum heap size") \
2016 range(0, 0XFFFFFFFFFFFFFFFF) \
2017 \
2018 product(bool, AggressiveHeap, false, \
2019 "Optimize heap options for long-running memory intensive apps") \
2020 \
2021 product(size_t, ErgoHeapSizeLimit, 0, \
2022 "Maximum ergonomically set heap size (in bytes); zero means use " \
2023 "MaxRAM * MaxRAMPercentage / 100") \
2024 range(0, max_uintx) \
2025 \
2026 product(uintx, MaxRAMFraction, 4, \
2027 "Maximum fraction (1/n) of real memory used for maximum heap " \
2028 "size. " \
2029 "Deprecated, use MaxRAMPercentage instead") \
2030 range(1, max_uintx) \
2031 \
2032 product(uintx, MinRAMFraction, 2, \
2033 "Minimum fraction (1/n) of real memory used for maximum heap " \
2034 "size on systems with small physical memory size. " \
2035 "Deprecated, use MinRAMPercentage instead") \
2036 range(1, max_uintx) \
2037 \
2038 product(uintx, InitialRAMFraction, 64, \
2039 "Fraction (1/n) of real memory used for initial heap size. " \
2040 "Deprecated, use InitialRAMPercentage instead") \
2041 range(1, max_uintx) \
2042 \
2043 product(double, MaxRAMPercentage, 25.0, \
2044 "Maximum percentage of real memory used for maximum heap size") \
2045 range(0.0, 100.0) \
2046 \
2047 product(double, MinRAMPercentage, 50.0, \
2048 "Minimum percentage of real memory used for maximum heap" \
2049 "size on systems with small physical memory size") \
2050 range(0.0, 100.0) \
2051 \
2052 product(double, InitialRAMPercentage, 1.5625, \
2053 "Percentage of real memory used for initial heap size") \
2054 range(0.0, 100.0) \
2055 \
2056 product(int, ActiveProcessorCount, -1, \
2057 "Specify the CPU count the VM should use and report as active") \
2058 \
2059 develop(uintx, MaxVirtMemFraction, 2, \
2060 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2061 "determining maximum heap size") \
2062 \
2063 product(bool, UseAdaptiveSizePolicy, true, \
2064 "Use adaptive generation sizing policies") \
2065 \
2066 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2067 "Use adaptive survivor sizing policies") \
2068 \
2069 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2070 "Use adaptive young-old sizing policies at minor collections") \
2071 \
2072 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2073 "Use adaptive young-old sizing policies at major collections") \
2074 \
2075 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2076 "Include statistics from System.gc() for adaptive size policy") \
2077 \
2078 product(bool, UseAdaptiveGCBoundary, false, \
2079 "Allow young-old boundary to move") \
2080 \
2081 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2082 "Resize the virtual spaces of the young or old generations") \
2083 range(-1, 1) \
2084 \
2085 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2086 "Policy for changing generation size for throughput goals") \
2087 range(0, 1) \
2088 \
2089 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2090 "Number of steps where heuristics is used before data is used") \
2091 range(0, max_uintx) \
2092 \
2093 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2094 "Number of collections before the adaptive sizing is started") \
2095 \
2096 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2097 "Collection interval for printing information; zero means never") \
2098 range(0, max_uintx) \
2099 \
2100 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2101 "Use adaptive minimum footprint as a goal") \
2102 \
2103 product(uintx, AdaptiveSizePolicyWeight, 10, \
2104 "Weight given to exponential resizing, between 0 and 100") \
2105 range(0, 100) \
2106 \
2107 product(uintx, AdaptiveTimeWeight, 25, \
2108 "Weight given to time in adaptive policy, between 0 and 100") \
2109 range(0, 100) \
2110 \
2111 product(uintx, PausePadding, 1, \
2112 "How much buffer to keep for pause time") \
2113 range(0, max_juint) \
2114 \
2115 product(uintx, PromotedPadding, 3, \
2116 "How much buffer to keep for promotion failure") \
2117 range(0, max_juint) \
2118 \
2119 product(uintx, SurvivorPadding, 3, \
2120 "How much buffer to keep for survivor overflow") \
2121 range(0, max_juint) \
2122 \
2123 product(uintx, ThresholdTolerance, 10, \
2124 "Allowed collection cost difference between generations") \
2125 range(0, 100) \
2126 \
2127 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2128 "If collection costs are within margin, reduce both by full " \
2129 "delta") \
2130 range(0, 100) \
2131 \
2132 product(uintx, YoungGenerationSizeIncrement, 20, \
2133 "Adaptive size percentage change in young generation") \
2134 range(0, 100) \
2135 \
2136 product(uintx, YoungGenerationSizeSupplement, 80, \
2137 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2138 range(0, 100) \
2139 \
2140 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2141 "Decay factor to YoungedGenerationSizeSupplement") \
2142 range(1, max_uintx) \
2143 \
2144 product(uintx, TenuredGenerationSizeIncrement, 20, \
2145 "Adaptive size percentage change in tenured generation") \
2146 range(0, 100) \
2147 \
2148 product(uintx, TenuredGenerationSizeSupplement, 80, \
2149 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2150 range(0, 100) \
2151 \
2152 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2153 "Decay factor to TenuredGenerationSizeIncrement") \
2154 range(1, max_uintx) \
2155 \
2156 product(uintx, MaxGCPauseMillis, max_uintx - 1, \
2157 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2158 "or (G1 Only) the maximum GC time per MMU time slice") \
2159 range(1, max_uintx - 1) \
2160 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2161 \
2162 product(uintx, GCPauseIntervalMillis, 0, \
2163 "Time slice for MMU specification") \
2164 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2165 \
2166 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2167 "Adaptive size policy maximum GC minor pause time goal " \
2168 "in millisecond") \
2169 range(0, max_uintx) \
2170 \
2171 product(uintx, GCTimeRatio, 99, \
2172 "Adaptive size policy application time to GC time ratio") \
2173 range(0, max_juint) \
2174 \
2175 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2176 "Adaptive size scale down factor for shrinking") \
2177 range(1, max_uintx) \
2178 \
2179 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2180 "Adaptive size decays the major cost for long major intervals") \
2181 \
2182 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2183 "Time scale over which major costs decay") \
2184 range(0, max_uintx) \
2185 \
2186 product(uintx, MinSurvivorRatio, 3, \
2187 "Minimum ratio of young generation/survivor space size") \
2188 range(3, max_uintx) \
2189 \
2190 product(uintx, InitialSurvivorRatio, 8, \
2191 "Initial ratio of young generation/survivor space size") \
2192 range(0, max_uintx) \
2193 \
2194 product(size_t, BaseFootPrintEstimate, 256*M, \
2195 "Estimate of footprint other than Java Heap") \
2196 range(0, max_uintx) \
2197 \
2198 product(bool, UseGCOverheadLimit, true, \
2199 "Use policy to limit of proportion of time spent in GC " \
2200 "before an OutOfMemory error is thrown") \
2201 \
2202 product(uintx, GCTimeLimit, 98, \
2203 "Limit of the proportion of time spent in GC before " \
2204 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2205 range(0, 100) \
2206 \
2207 product(uintx, GCHeapFreeLimit, 2, \
2208 "Minimum percentage of free space after a full GC before an " \
2209 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2210 range(0, 100) \
2211 \
2212 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2213 "Number of consecutive collections before gc time limit fires") \
2214 range(1, max_uintx) \
2215 \
2216 product(intx, PrefetchCopyIntervalInBytes, -1, \
2217 "How far ahead to prefetch destination area (<= 0 means off)") \
2218 range(-1, max_jint) \
2219 \
2220 product(intx, PrefetchScanIntervalInBytes, -1, \
2221 "How far ahead to prefetch scan area (<= 0 means off)") \
2222 range(-1, max_jint) \
2223 \
2224 product(intx, PrefetchFieldsAhead, -1, \
2225 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2226 range(-1, max_jint) \
2227 \
2228 diagnostic(bool, VerifyDuringStartup, false, \
2229 "Verify memory system before executing any Java code " \
2230 "during VM initialization") \
2231 \
2232 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2233 "Verify system before exiting") \
2234 \
2235 diagnostic(bool, VerifyBeforeGC, false, \
2236 "Verify memory system before GC") \
2237 \
2238 diagnostic(bool, VerifyAfterGC, false, \
2239 "Verify memory system after GC") \
2240 \
2241 diagnostic(bool, VerifyDuringGC, false, \
2242 "Verify memory system during GC (between phases)") \
2243 \
2244 diagnostic(ccstrlist, VerifyGCType, "", \
2245 "GC type(s) to verify when Verify*GC is enabled." \
2246 "Available types are collector specific.") \
2247 \
2248 diagnostic(ccstrlist, VerifySubSet, "", \
2249 "Memory sub-systems to verify when Verify*GC flag(s) " \
2250 "are enabled. One or more sub-systems can be specified " \
2251 "in a comma separated string. Sub-systems are: " \
2252 "threads, heap, symbol_table, string_table, codecache, " \
2253 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2254 "codecache_oops") \
2255 \
2256 diagnostic(bool, GCParallelVerificationEnabled, true, \
2257 "Enable parallel memory system verification") \
2258 \
2259 diagnostic(bool, DeferInitialCardMark, false, \
2260 "When +ReduceInitialCardMarks, explicitly defer any that " \
2261 "may arise from new_pre_store_barrier") \
2262 \
2263 product(bool, UseCondCardMark, false, \
2264 "Check for already marked card before updating card table") \
2265 \
2266 diagnostic(bool, VerifyRememberedSets, false, \
2267 "Verify GC remembered sets") \
2268 \
2269 diagnostic(bool, VerifyObjectStartArray, true, \
2270 "Verify GC object start array if verify before/after") \
2271 \
2272 product(bool, DisableExplicitGC, false, \
2273 "Ignore calls to System.gc()") \
2274 \
2275 notproduct(bool, CheckMemoryInitialization, false, \
2276 "Check memory initialization") \
2277 \
2278 diagnostic(bool, BindCMSThreadToCPU, false, \
2279 "Bind CMS Thread to CPU if possible") \
2280 \
2281 diagnostic(uintx, CPUForCMSThread, 0, \
2282 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2283 range(0, max_juint) \
2284 \
2285 product(bool, BindGCTaskThreadsToCPUs, false, \
2286 "Bind GCTaskThreads to CPUs if possible") \
2287 \
2288 product(bool, UseGCTaskAffinity, false, \
2289 "Use worker affinity when asking for GCTasks") \
2290 \
2291 product(uintx, ProcessDistributionStride, 4, \
2292 "Stride through processors when distributing processes") \
2293 range(0, max_juint) \
2294 \
2295 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2296 "Number of times the coordinator GC thread will sleep while " \
2297 "yielding before giving up and resuming GC") \
2298 range(0, max_juint) \
2299 \
2300 product(uintx, CMSYieldSleepCount, 0, \
2301 "Number of times a GC thread (minus the coordinator) " \
2302 "will sleep while yielding before giving up and resuming GC") \
2303 range(0, max_juint) \
2304 \
2305 product(bool, PrintGC, false, \
2306 "Print message at garbage collection. " \
2307 "Deprecated, use -Xlog:gc instead.") \
2308 \
2309 product(bool, PrintGCDetails, false, \
2310 "Print more details at garbage collection. " \
2311 "Deprecated, use -Xlog:gc* instead.") \
2312 \
2313 develop(intx, ConcGCYieldTimeout, 0, \
2314 "If non-zero, assert that GC threads yield within this " \
2315 "number of milliseconds") \
2316 range(0, max_intx) \
2317 \
2318 develop(bool, TraceFinalizerRegistration, false, \
2319 "Trace registration of final references") \
2320 \
2321 notproduct(bool, TraceScavenge, false, \
2322 "Trace scavenge") \
2323 \
2324 product(bool, IgnoreEmptyClassPaths, false, \
2325 "Ignore empty path elements in -classpath") \
2326 \
2327 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2328 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2329 "Initial size of the boot class loader data metaspace") \
2330 range(30*K, max_uintx/BytesPerWord) \
2331 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2332 \
2333 product(bool, PrintHeapAtSIGBREAK, true, \
2334 "Print heap layout in response to SIGBREAK") \
2335 \
2336 manageable(bool, PrintClassHistogram, false, \
2337 "Print a histogram of class instances") \
2338 \
2339 develop(bool, TraceGCTaskManager, false, \
2340 "Trace actions of the GC task manager") \
2341 \
2342 develop(bool, TraceGCTaskQueue, false, \
2343 "Trace actions of the GC task queues") \
2344 \
2345 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2346 "Trace marking phase in ParallelOldGC") \
2347 \
2348 develop(bool, TraceParallelOldGCDensePrefix, false, \
2349 "Trace dense prefix computation for ParallelOldGC") \
2350 \
2351 develop(bool, IgnoreLibthreadGPFault, false, \
2352 "Suppress workaround for libthread GP fault") \
2353 \
2354 experimental(double, ObjectCountCutOffPercent, 0.5, \
2355 "The percentage of the used heap that the instances of a class " \
2356 "must occupy for the class to generate a trace event") \
2357 range(0.0, 100.0) \
2358 \
2359 /* JVMTI heap profiling */ \
2360 \
2361 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2362 "Trace JVMTI object tagging calls") \
2363 \
2364 diagnostic(bool, VerifyBeforeIteration, false, \
2365 "Verify memory system before JVMTI iteration") \
2366 \
2367 /* compiler interface */ \
2368 \
2369 develop(bool, CIPrintCompilerName, false, \
2370 "when CIPrint is active, print the name of the active compiler") \
2371 \
2372 diagnostic(bool, CIPrintCompileQueue, false, \
2373 "display the contents of the compile queue whenever a " \
2374 "compilation is enqueued") \
2375 \
2376 develop(bool, CIPrintRequests, false, \
2377 "display every request for compilation") \
2378 \
2379 product(bool, CITime, false, \
2380 "collect timing information for compilation") \
2381 \
2382 develop(bool, CITimeVerbose, false, \
2383 "be more verbose in compilation timings") \
2384 \
2385 develop(bool, CITimeEach, false, \
2386 "display timing information after each successful compilation") \
2387 \
2388 develop(bool, CICountOSR, false, \
2389 "use a separate counter when assigning ids to osr compilations") \
2390 \
2391 develop(bool, CICompileNatives, true, \
2392 "compile native methods if supported by the compiler") \
2393 \
2394 develop_pd(bool, CICompileOSR, \
2395 "compile on stack replacement methods if supported by the " \
2396 "compiler") \
2397 \
2398 develop(bool, CIPrintMethodCodes, false, \
2399 "print method bytecodes of the compiled code") \
2400 \
2401 develop(bool, CIPrintTypeFlow, false, \
2402 "print the results of ciTypeFlow analysis") \
2403 \
2404 develop(bool, CITraceTypeFlow, false, \
2405 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2406 \
2407 develop(intx, OSROnlyBCI, -1, \
2408 "OSR only at this bci. Negative values mean exclude that bci") \
2409 \
2410 /* compiler */ \
2411 \
2412 /* notice: the max range value here is max_jint, not max_intx */ \
2413 /* because of overflow issue */ \
2414 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2415 "Number of compiler threads to run") \
2416 range(0, max_jint) \
2417 constraint(CICompilerCountConstraintFunc, AfterErgo) \
2418 \
2419 product(bool, UseDynamicNumberOfCompilerThreads, true, \
2420 "Dynamically choose the number of parallel compiler threads") \
2421 \
2422 product(bool, ReduceNumberOfCompilerThreads, true, \
2423 "Reduce the number of parallel compiler threads when they are " \
2424 "not used") \
2425 \
2426 diagnostic(bool, TraceCompilerThreads, false, \
2427 "Trace creation and removal of compiler threads") \
2428 \
2429 diagnostic(bool, InjectCompilerCreationFailure, false, \
2430 "Inject thread creation failures for " \
2431 "UseDynamicNumberOfCompilerThreads") \
2432 \
2433 product(intx, CompilationPolicyChoice, 0, \
2434 "which compilation policy (0-3)") \
2435 range(0, 3) \
2436 \
2437 develop(bool, UseStackBanging, true, \
2438 "use stack banging for stack overflow checks (required for " \
2439 "proper StackOverflow handling; disable only to measure cost " \
2440 "of stackbanging)") \
2441 \
2442 develop(bool, UseStrictFP, true, \
2443 "use strict fp if modifier strictfp is set") \
2444 \
2445 develop(bool, GenerateSynchronizationCode, true, \
2446 "generate locking/unlocking code for synchronized methods and " \
2447 "monitors") \
2448 \
2449 develop(bool, GenerateRangeChecks, true, \
2450 "Generate range checks for array accesses") \
2451 \
2452 diagnostic_pd(bool, ImplicitNullChecks, \
2453 "Generate code for implicit null checks") \
2454 \
2455 product_pd(bool, TrapBasedNullChecks, \
2456 "Generate code for null checks that uses a cmp and trap " \
2457 "instruction raising SIGTRAP. This is only used if an access to" \
2458 "null (+offset) will not raise a SIGSEGV, i.e.," \
2459 "ImplicitNullChecks don't work (PPC64).") \
2460 \
2461 product(bool, PrintSafepointStatistics, false, \
2462 "(Deprecated) Print statistics about safepoint synchronization") \
2463 \
2464 product(intx, PrintSafepointStatisticsCount, 300, \
2465 "(Deprecated) Total number of safepoint statistics collected " \
2466 "before printing them out") \
2467 range(1, max_intx) \
2468 \
2469 product(intx, PrintSafepointStatisticsTimeout, -1, \
2470 "(Deprecated) Print safepoint statistics only when safepoint takes " \
2471 "more than PrintSafepointSatisticsTimeout in millis") \
2472 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2473 NOT_LP64(range(-1, max_intx)) \
2474 \
2475 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \
2476 "Enable Thread SMR extra validity checks") \
2477 \
2478 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \
2479 "Enable Thread SMR Statistics") \
2480 \
2481 product(bool, Inline, true, \
2482 "Enable inlining") \
2483 \
2484 product(bool, ClipInlining, true, \
2485 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2486 \
2487 develop(bool, UseCHA, true, \
2488 "Enable CHA") \
2489 \
2490 product(bool, UseTypeProfile, true, \
2491 "Check interpreter profile for historically monomorphic calls") \
2492 \
2493 diagnostic(bool, PrintInlining, false, \
2494 "Print inlining optimizations") \
2495 \
2496 product(bool, UsePopCountInstruction, false, \
2497 "Use population count instruction") \
2498 \
2499 develop(bool, EagerInitialization, false, \
2500 "Eagerly initialize classes if possible") \
2501 \
2502 diagnostic(bool, LogTouchedMethods, false, \
2503 "Log methods which have been ever touched in runtime") \
2504 \
2505 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2506 "Print all methods that have been ever touched in runtime") \
2507 \
2508 develop(bool, TraceMethodReplacement, false, \
2509 "Print when methods are replaced do to recompilation") \
2510 \
2511 develop(bool, PrintMethodFlushing, false, \
2512 "Print the nmethods being flushed") \
2513 \
2514 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2515 "print statistics about method flushing") \
2516 \
2517 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2518 "Number of compiled code invocations after which " \
2519 "the method is considered as hot by the flusher") \
2520 range(1, max_jint) \
2521 \
2522 diagnostic(intx, MinPassesBeforeFlush, 10, \
2523 "Minimum number of sweeper passes before an nmethod " \
2524 "can be flushed") \
2525 range(0, max_intx) \
2526 \
2527 product(bool, UseCodeAging, true, \
2528 "Insert counter to detect warm methods") \
2529 \
2530 diagnostic(bool, StressCodeAging, false, \
2531 "Start with counters compiled in") \
2532 \
2533 develop(bool, StressCodeBuffers, false, \
2534 "Exercise code buffer expansion and other rare state changes") \
2535 \
2536 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2537 "Generate extra debugging information for non-safepoints in " \
2538 "nmethods") \
2539 \
2540 product(bool, PrintVMOptions, false, \
2541 "Print flags that appeared on the command line") \
2542 \
2543 product(bool, IgnoreUnrecognizedVMOptions, false, \
2544 "Ignore unrecognized VM options") \
2545 \
2546 product(bool, PrintCommandLineFlags, false, \
2547 "Print flags specified on command line or set by ergonomics") \
2548 \
2549 product(bool, PrintFlagsInitial, false, \
2550 "Print all VM flags before argument processing and exit VM") \
2551 \
2552 product(bool, PrintFlagsFinal, false, \
2553 "Print all VM flags after argument and ergonomic processing") \
2554 \
2555 notproduct(bool, PrintFlagsWithComments, false, \
2556 "Print all VM flags with default values and descriptions and " \
2557 "exit") \
2558 \
2559 product(bool, PrintFlagsRanges, false, \
2560 "Print VM flags and their ranges and exit VM") \
2561 \
2562 diagnostic(bool, SerializeVMOutput, true, \
2563 "Use a mutex to serialize output to tty and LogFile") \
2564 \
2565 diagnostic(bool, DisplayVMOutput, true, \
2566 "Display all VM output on the tty, independently of LogVMOutput") \
2567 \
2568 diagnostic(bool, LogVMOutput, false, \
2569 "Save VM output to LogFile") \
2570 \
2571 diagnostic(ccstr, LogFile, NULL, \
2572 "If LogVMOutput or LogCompilation is on, save VM output to " \
2573 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2574 \
2575 product(ccstr, ErrorFile, NULL, \
2576 "If an error occurs, save the error data to this file " \
2577 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2578 \
2579 product(bool, DisplayVMOutputToStderr, false, \
2580 "If DisplayVMOutput is true, display all VM output to stderr") \
2581 \
2582 product(bool, DisplayVMOutputToStdout, false, \
2583 "If DisplayVMOutput is true, display all VM output to stdout") \
2584 \
2585 product(bool, UseHeavyMonitors, false, \
2586 "use heavyweight instead of lightweight Java monitors") \
2587 \
2588 product(bool, PrintStringTableStatistics, false, \
2589 "print statistics about the StringTable and SymbolTable") \
2590 \
2591 diagnostic(bool, VerifyStringTableAtExit, false, \
2592 "verify StringTable contents at exit") \
2593 \
2594 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2595 "print histogram of the symbol table") \
2596 \
2597 notproduct(bool, ExitVMOnVerifyError, false, \
2598 "standard exit from VM if bytecode verify error " \
2599 "(only in debug mode)") \
2600 \
2601 diagnostic(ccstr, AbortVMOnException, NULL, \
2602 "Call fatal if this exception is thrown. Example: " \
2603 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2604 \
2605 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2606 "Call fatal if the exception pointed by AbortVMOnException " \
2607 "has this message") \
2608 \
2609 develop(bool, DebugVtables, false, \
2610 "add debugging code to vtable dispatch") \
2611 \
2612 notproduct(bool, PrintVtableStats, false, \
2613 "print vtables stats at end of run") \
2614 \
2615 develop(bool, TraceCreateZombies, false, \
2616 "trace creation of zombie nmethods") \
2617 \
2618 notproduct(bool, IgnoreLockingAssertions, false, \
2619 "disable locking assertions (for speed)") \
2620 \
2621 product(bool, RangeCheckElimination, true, \
2622 "Eliminate range checks") \
2623 \
2624 develop_pd(bool, UncommonNullCast, \
2625 "track occurrences of null in casts; adjust compiler tactics") \
2626 \
2627 develop(bool, TypeProfileCasts, true, \
2628 "treat casts like calls for purposes of type profiling") \
2629 \
2630 develop(bool, DelayCompilationDuringStartup, true, \
2631 "Delay invoking the compiler until main application class is " \
2632 "loaded") \
2633 \
2634 develop(bool, CompileTheWorld, false, \
2635 "Compile all methods in all classes in bootstrap class path " \
2636 "(stress test)") \
2637 \
2638 develop(bool, CompileTheWorldPreloadClasses, true, \
2639 "Preload all classes used by a class before start loading") \
2640 \
2641 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2642 "Force a safepoint every n compiles so sweeper can keep up") \
2643 \
2644 develop(bool, FillDelaySlots, true, \
2645 "Fill delay slots (on SPARC only)") \
2646 \
2647 develop(bool, TimeLivenessAnalysis, false, \
2648 "Time computation of bytecode liveness analysis") \
2649 \
2650 develop(bool, TraceLivenessGen, false, \
2651 "Trace the generation of liveness analysis information") \
2652 \
2653 notproduct(bool, TraceLivenessQuery, false, \
2654 "Trace queries of liveness analysis information") \
2655 \
2656 notproduct(bool, CollectIndexSetStatistics, false, \
2657 "Collect information about IndexSets") \
2658 \
2659 develop(bool, UseLoopSafepoints, true, \
2660 "Generate Safepoint nodes in every loop") \
2661 \
2662 develop(intx, FastAllocateSizeLimit, 128*K, \
2663 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2664 "Inline allocations larger than this in doublewords must go slow")\
2665 \
2666 product(bool, AggressiveOpts, false, \
2667 "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \
2668 \
2669 product_pd(bool, CompactStrings, \
2670 "Enable Strings to use single byte chars in backing store") \
2671 \
2672 product_pd(uintx, TypeProfileLevel, \
2673 "=XYZ, with Z: Type profiling of arguments at call; " \
2674 "Y: Type profiling of return value at call; " \
2675 "X: Type profiling of parameters to methods; " \
2676 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2677 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2678 \
2679 product(intx, TypeProfileArgsLimit, 2, \
2680 "max number of call arguments to consider for type profiling") \
2681 range(0, 16) \
2682 \
2683 product(intx, TypeProfileParmsLimit, 2, \
2684 "max number of incoming parameters to consider for type profiling"\
2685 ", -1 for all") \
2686 range(-1, 64) \
2687 \
2688 /* statistics */ \
2689 develop(bool, CountCompiledCalls, false, \
2690 "Count method invocations") \
2691 \
2692 notproduct(bool, CountRuntimeCalls, false, \
2693 "Count VM runtime calls") \
2694 \
2695 develop(bool, CountJNICalls, false, \
2696 "Count jni method invocations") \
2697 \
2698 notproduct(bool, CountJVMCalls, false, \
2699 "Count jvm method invocations") \
2700 \
2701 notproduct(bool, CountRemovableExceptions, false, \
2702 "Count exceptions that could be replaced by branches due to " \
2703 "inlining") \
2704 \
2705 notproduct(bool, ICMissHistogram, false, \
2706 "Produce histogram of IC misses") \
2707 \
2708 /* interpreter */ \
2709 product_pd(bool, RewriteBytecodes, \
2710 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2711 \
2712 product_pd(bool, RewriteFrequentPairs, \
2713 "Rewrite frequently used bytecode pairs into a single bytecode") \
2714 \
2715 diagnostic(bool, PrintInterpreter, false, \
2716 "Print the generated interpreter code") \
2717 \
2718 product(bool, UseInterpreter, true, \
2719 "Use interpreter for non-compiled methods") \
2720 \
2721 develop(bool, UseFastSignatureHandlers, true, \
2722 "Use fast signature handlers for native calls") \
2723 \
2724 product(bool, UseLoopCounter, true, \
2725 "Increment invocation counter on backward branch") \
2726 \
2727 product_pd(bool, UseOnStackReplacement, \
2728 "Use on stack replacement, calls runtime if invoc. counter " \
2729 "overflows in loop") \
2730 \
2731 notproduct(bool, TraceOnStackReplacement, false, \
2732 "Trace on stack replacement") \
2733 \
2734 product_pd(bool, PreferInterpreterNativeStubs, \
2735 "Use always interpreter stubs for native methods invoked via " \
2736 "interpreter") \
2737 \
2738 develop(bool, CountBytecodes, false, \
2739 "Count number of bytecodes executed") \
2740 \
2741 develop(bool, PrintBytecodeHistogram, false, \
2742 "Print histogram of the executed bytecodes") \
2743 \
2744 develop(bool, PrintBytecodePairHistogram, false, \
2745 "Print histogram of the executed bytecode pairs") \
2746 \
2747 diagnostic(bool, PrintSignatureHandlers, false, \
2748 "Print code generated for native method signature handlers") \
2749 \
2750 develop(bool, VerifyOops, false, \
2751 "Do plausibility checks for oops") \
2752 \
2753 develop(bool, CheckUnhandledOops, false, \
2754 "Check for unhandled oops in VM code") \
2755 \
2756 develop(bool, VerifyJNIFields, trueInDebug, \
2757 "Verify jfieldIDs for instance fields") \
2758 \
2759 notproduct(bool, VerifyJNIEnvThread, false, \
2760 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2761 "from JNI") \
2762 \
2763 develop(bool, VerifyFPU, false, \
2764 "Verify FPU state (check for NaN's, etc.)") \
2765 \
2766 develop(bool, VerifyThread, false, \
2767 "Watch the thread register for corruption (SPARC only)") \
2768 \
2769 develop(bool, VerifyActivationFrameSize, false, \
2770 "Verify that activation frame didn't become smaller than its " \
2771 "minimal size") \
2772 \
2773 develop(bool, TraceFrequencyInlining, false, \
2774 "Trace frequency based inlining") \
2775 \
2776 develop_pd(bool, InlineIntrinsics, \
2777 "Inline intrinsics that can be statically resolved") \
2778 \
2779 product_pd(bool, ProfileInterpreter, \
2780 "Profile at the bytecode level during interpretation") \
2781 \
2782 develop(bool, TraceProfileInterpreter, false, \
2783 "Trace profiling at the bytecode level during interpretation. " \
2784 "This outputs the profiling information collected to improve " \
2785 "jit compilation.") \
2786 \
2787 develop_pd(bool, ProfileTraps, \
2788 "Profile deoptimization traps at the bytecode level") \
2789 \
2790 product(intx, ProfileMaturityPercentage, 20, \
2791 "number of method invocations/branches (expressed as % of " \
2792 "CompileThreshold) before using the method's profile") \
2793 range(0, 100) \
2794 \
2795 diagnostic(bool, PrintMethodData, false, \
2796 "Print the results of +ProfileInterpreter at end of run") \
2797 \
2798 develop(bool, VerifyDataPointer, trueInDebug, \
2799 "Verify the method data pointer during interpreter profiling") \
2800 \
2801 develop(bool, VerifyCompiledCode, false, \
2802 "Include miscellaneous runtime verifications in nmethod code; " \
2803 "default off because it disturbs nmethod size heuristics") \
2804 \
2805 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2806 "Manually make GC thread crash then dump java stack trace; " \
2807 "Test only") \
2808 \
2809 /* compilation */ \
2810 product(bool, UseCompiler, true, \
2811 "Use Just-In-Time compilation") \
2812 \
2813 develop(bool, TraceCompilationPolicy, false, \
2814 "Trace compilation policy") \
2815 \
2816 develop(bool, TimeCompilationPolicy, false, \
2817 "Time the compilation policy") \
2818 \
2819 product(bool, UseCounterDecay, true, \
2820 "Adjust recompilation counters") \
2821 \
2822 develop(intx, CounterHalfLifeTime, 30, \
2823 "Half-life time of invocation counters (in seconds)") \
2824 \
2825 develop(intx, CounterDecayMinIntervalLength, 500, \
2826 "The minimum interval (in milliseconds) between invocation of " \
2827 "CounterDecay") \
2828 \
2829 product(bool, AlwaysCompileLoopMethods, false, \
2830 "When using recompilation, never interpret methods " \
2831 "containing loops") \
2832 \
2833 product(bool, DontCompileHugeMethods, true, \
2834 "Do not compile methods > HugeMethodLimit") \
2835 \
2836 /* Bytecode escape analysis estimation. */ \
2837 product(bool, EstimateArgEscape, true, \
2838 "Analyze bytecodes to estimate escape state of arguments") \
2839 \
2840 product(intx, BCEATraceLevel, 0, \
2841 "How much tracing to do of bytecode escape analysis estimates " \
2842 "(0-3)") \
2843 range(0, 3) \
2844 \
2845 product(intx, MaxBCEAEstimateLevel, 5, \
2846 "Maximum number of nested calls that are analyzed by BC EA") \
2847 range(0, max_jint) \
2848 \
2849 product(intx, MaxBCEAEstimateSize, 150, \
2850 "Maximum bytecode size of a method to be analyzed by BC EA") \
2851 range(0, max_jint) \
2852 \
2853 product(intx, AllocatePrefetchStyle, 1, \
2854 "0 = no prefetch, " \
2855 "1 = generate prefetch instructions for each allocation, " \
2856 "2 = use TLAB watermark to gate allocation prefetch, " \
2857 "3 = generate one prefetch instruction per cache line") \
2858 range(0, 3) \
2859 \
2860 product(intx, AllocatePrefetchDistance, -1, \
2861 "Distance to prefetch ahead of allocation pointer. " \
2862 "-1: use system-specific value (automatically determined") \
2863 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2864 \
2865 product(intx, AllocatePrefetchLines, 3, \
2866 "Number of lines to prefetch ahead of array allocation pointer") \
2867 range(1, 64) \
2868 \
2869 product(intx, AllocateInstancePrefetchLines, 1, \
2870 "Number of lines to prefetch ahead of instance allocation " \
2871 "pointer") \
2872 range(1, 64) \
2873 \
2874 product(intx, AllocatePrefetchStepSize, 16, \
2875 "Step size in bytes of sequential prefetch instructions") \
2876 range(1, 512) \
2877 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2878 \
2879 product(intx, AllocatePrefetchInstr, 0, \
2880 "Select instruction to prefetch ahead of allocation pointer") \
2881 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
2882 \
2883 /* deoptimization */ \
2884 develop(bool, TraceDeoptimization, false, \
2885 "Trace deoptimization") \
2886 \
2887 develop(bool, PrintDeoptimizationDetails, false, \
2888 "Print more information about deoptimization") \
2889 \
2890 develop(bool, DebugDeoptimization, false, \
2891 "Tracing various information while debugging deoptimization") \
2892 \
2893 product(intx, SelfDestructTimer, 0, \
2894 "Will cause VM to terminate after a given time (in minutes) " \
2895 "(0 means off)") \
2896 range(0, max_intx) \
2897 \
2898 product(intx, MaxJavaStackTraceDepth, 1024, \
2899 "The maximum number of lines in the stack trace for Java " \
2900 "exceptions (0 means all)") \
2901 range(0, max_jint/2) \
2902 \
2903 /* notice: the max range value here is max_jint, not max_intx */ \
2904 /* because of overflow issue */ \
2905 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2906 "Guarantee a safepoint (at least) every so many milliseconds " \
2907 "(0 means none)") \
2908 range(0, max_jint) \
2909 \
2910 product(intx, SafepointTimeoutDelay, 10000, \
2911 "Delay in milliseconds for option SafepointTimeout") \
2912 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
2913 NOT_LP64(range(0, max_intx)) \
2914 \
2915 product(intx, NmethodSweepActivity, 10, \
2916 "Removes cold nmethods from code cache if > 0. Higher values " \
2917 "result in more aggressive sweeping") \
2918 range(0, 2000) \
2919 \
2920 notproduct(bool, LogSweeper, false, \
2921 "Keep a ring buffer of sweeper activity") \
2922 \
2923 notproduct(intx, SweeperLogEntries, 1024, \
2924 "Number of records in the ring buffer of sweeper activity") \
2925 \
2926 notproduct(intx, MemProfilingInterval, 500, \
2927 "Time between each invocation of the MemProfiler") \
2928 \
2929 develop(intx, MallocCatchPtr, -1, \
2930 "Hit breakpoint when mallocing/freeing this pointer") \
2931 \
2932 notproduct(ccstrlist, SuppressErrorAt, "", \
2933 "List of assertions (file:line) to muzzle") \
2934 \
2935 develop(intx, StackPrintLimit, 100, \
2936 "number of stack frames to print in VM-level stack dump") \
2937 \
2938 notproduct(intx, MaxElementPrintSize, 256, \
2939 "maximum number of elements to print") \
2940 \
2941 notproduct(intx, MaxSubklassPrintSize, 4, \
2942 "maximum number of subklasses to print when printing klass") \
2943 \
2944 product(intx, MaxInlineLevel, 9, \
2945 "maximum number of nested calls that are inlined") \
2946 range(0, max_jint) \
2947 \
2948 product(intx, MaxRecursiveInlineLevel, 1, \
2949 "maximum number of nested recursive calls that are inlined") \
2950 range(0, max_jint) \
2951 \
2952 develop(intx, MaxForceInlineLevel, 100, \
2953 "maximum number of nested calls that are forced for inlining " \
2954 "(using CompileCommand or marked w/ @ForceInline)") \
2955 range(0, max_jint) \
2956 \
2957 product_pd(intx, InlineSmallCode, \
2958 "Only inline already compiled methods if their code size is " \
2959 "less than this") \
2960 range(0, max_jint) \
2961 \
2962 product(intx, MaxInlineSize, 35, \
2963 "The maximum bytecode size of a method to be inlined") \
2964 range(0, max_jint) \
2965 \
2966 product_pd(intx, FreqInlineSize, \
2967 "The maximum bytecode size of a frequent method to be inlined") \
2968 range(0, max_jint) \
2969 \
2970 product(intx, MaxTrivialSize, 6, \
2971 "The maximum bytecode size of a trivial method to be inlined") \
2972 range(0, max_jint) \
2973 \
2974 product(intx, MinInliningThreshold, 250, \
2975 "The minimum invocation count a method needs to have to be " \
2976 "inlined") \
2977 range(0, max_jint) \
2978 \
2979 develop(intx, MethodHistogramCutoff, 100, \
2980 "The cutoff value for method invocation histogram (+CountCalls)") \
2981 \
2982 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
2983 "Number of interpreted methods to show in profile") \
2984 \
2985 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
2986 "Number of compiled methods to show in profile") \
2987 \
2988 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
2989 "Number of stub methods to show in profile") \
2990 \
2991 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2992 "Number of runtime stub nodes to show in profile") \
2993 \
2994 product(intx, ProfileIntervalsTicks, 100, \
2995 "Number of ticks between printing of interval profile " \
2996 "(+ProfileIntervals)") \
2997 range(0, max_intx) \
2998 \
2999 notproduct(intx, ScavengeALotInterval, 1, \
3000 "Interval between which scavenge will occur with +ScavengeALot") \
3001 \
3002 notproduct(intx, FullGCALotInterval, 1, \
3003 "Interval between which full gc will occur with +FullGCALot") \
3004 \
3005 notproduct(intx, FullGCALotStart, 0, \
3006 "For which invocation to start FullGCAlot") \
3007 \
3008 notproduct(intx, FullGCALotDummies, 32*K, \
3009 "Dummy object allocated with +FullGCALot, forcing all objects " \
3010 "to move") \
3011 \
3012 develop(intx, DontYieldALotInterval, 10, \
3013 "Interval between which yields will be dropped (milliseconds)") \
3014 \
3015 develop(intx, ProfilerPCTickThreshold, 15, \
3016 "Number of ticks in a PC buckets to be a hotspot") \
3017 \
3018 notproduct(intx, DeoptimizeALotInterval, 5, \
3019 "Number of exits until DeoptimizeALot kicks in") \
3020 \
3021 notproduct(intx, ZombieALotInterval, 5, \
3022 "Number of exits until ZombieALot kicks in") \
3023 \
3024 diagnostic(uintx, MallocMaxTestWords, 0, \
3025 "If non-zero, maximum number of words that malloc/realloc can " \
3026 "allocate (for testing only)") \
3027 range(0, max_uintx) \
3028 \
3029 product(intx, TypeProfileWidth, 2, \
3030 "Number of receiver types to record in call/cast profile") \
3031 range(0, 8) \
3032 \
3033 develop(intx, BciProfileWidth, 2, \
3034 "Number of return bci's to record in ret profile") \
3035 \
3036 product(intx, PerMethodRecompilationCutoff, 400, \
3037 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3038 range(-1, max_intx) \
3039 \
3040 product(intx, PerBytecodeRecompilationCutoff, 200, \
3041 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3042 range(-1, max_intx) \
3043 \
3044 product(intx, PerMethodTrapLimit, 100, \
3045 "Limit on traps (of one kind) in a method (includes inlines)") \
3046 range(0, max_jint) \
3047 \
3048 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3049 "Limit on speculative traps (of one kind) in a method " \
3050 "(includes inlines)") \
3051 range(0, max_jint) \
3052 \
3053 product(intx, PerBytecodeTrapLimit, 4, \
3054 "Limit on traps (of one kind) at a particular BCI") \
3055 range(0, max_jint) \
3056 \
3057 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3058 "Extra method data trap entries for speculation") \
3059 \
3060 develop(intx, InlineFrequencyRatio, 20, \
3061 "Ratio of call site execution to caller method invocation") \
3062 range(0, max_jint) \
3063 \
3064 diagnostic_pd(intx, InlineFrequencyCount, \
3065 "Count of call site execution necessary to trigger frequent " \
3066 "inlining") \
3067 range(0, max_jint) \
3068 \
3069 develop(intx, InlineThrowCount, 50, \
3070 "Force inlining of interpreted methods that throw this often") \
3071 range(0, max_jint) \
3072 \
3073 develop(intx, InlineThrowMaxSize, 200, \
3074 "Force inlining of throwing methods smaller than this") \
3075 range(0, max_jint) \
3076 \
3077 develop(intx, ProfilerNodeSize, 1024, \
3078 "Size in K to allocate for the Profile Nodes of each thread") \
3079 range(0, 1024) \
3080 \
3081 /* gc parameters */ \
3082 product(size_t, InitialHeapSize, 0, \
3083 "Initial heap size (in bytes); zero means use ergonomics") \
3084 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3085 \
3086 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3087 "Maximum heap size (in bytes)") \
3088 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3089 \
3090 product(size_t, OldSize, ScaleForWordSize(4*M), \
3091 "Initial tenured generation size (in bytes)") \
3092 range(0, max_uintx) \
3093 \
3094 product(size_t, NewSize, ScaleForWordSize(1*M), \
3095 "Initial new generation size (in bytes)") \
3096 constraint(NewSizeConstraintFunc,AfterErgo) \
3097 \
3098 product(size_t, MaxNewSize, max_uintx, \
3099 "Maximum new generation size (in bytes), max_uintx means set " \
3100 "ergonomically") \
3101 range(0, max_uintx) \
3102 \
3103 product_pd(size_t, HeapBaseMinAddress, \
3104 "OS specific low limit for heap base address") \
3105 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3106 \
3107 product(size_t, PretenureSizeThreshold, 0, \
3108 "Maximum size in bytes of objects allocated in DefNew " \
3109 "generation; zero means no maximum") \
3110 range(0, max_uintx) \
3111 \
3112 product(size_t, MinTLABSize, 2*K, \
3113 "Minimum allowed TLAB size (in bytes)") \
3114 range(1, max_uintx/2) \
3115 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3116 \
3117 product(size_t, TLABSize, 0, \
3118 "Starting TLAB size (in bytes); zero means set ergonomically") \
3119 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3120 \
3121 product(size_t, YoungPLABSize, 4096, \
3122 "Size of young gen promotion LAB's (in HeapWords)") \
3123 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3124 \
3125 product(size_t, OldPLABSize, 1024, \
3126 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3127 "of blocks to attempt to claim when refilling CMS LAB's") \
3128 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3129 \
3130 product(uintx, TLABAllocationWeight, 35, \
3131 "Allocation averaging weight") \
3132 range(0, 100) \
3133 \
3134 /* Limit the lower bound of this flag to 1 as it is used */ \
3135 /* in a division expression. */ \
3136 product(uintx, TLABWasteTargetPercent, 1, \
3137 "Percentage of Eden that can be wasted") \
3138 range(1, 100) \
3139 \
3140 product(uintx, TLABRefillWasteFraction, 64, \
3141 "Maximum TLAB waste at a refill (internal fragmentation)") \
3142 range(1, max_juint) \
3143 \
3144 product(uintx, TLABWasteIncrement, 4, \
3145 "Increment allowed waste at slow allocation") \
3146 range(0, max_jint) \
3147 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3148 \
3149 product(uintx, SurvivorRatio, 8, \
3150 "Ratio of eden/survivor space size") \
3151 range(1, max_uintx-2) \
3152 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3153 \
3154 product(uintx, NewRatio, 2, \
3155 "Ratio of old/new generation sizes") \
3156 range(0, max_uintx-1) \
3157 \
3158 product_pd(size_t, NewSizeThreadIncrease, \
3159 "Additional size added to desired new generation size per " \
3160 "non-daemon thread (in bytes)") \
3161 range(0, max_uintx) \
3162 \
3163 product_pd(size_t, MetaspaceSize, \
3164 "Initial threshold (in bytes) at which a garbage collection " \
3165 "is done to reduce Metaspace usage") \
3166 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3167 \
3168 product(size_t, MaxMetaspaceSize, max_uintx, \
3169 "Maximum size of Metaspaces (in bytes)") \
3170 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3171 \
3172 product(size_t, CompressedClassSpaceSize, 1*G, \
3173 "Maximum size of class area in Metaspace when compressed " \
3174 "class pointers are used") \
3175 range(1*M, 3*G) \
3176 \
3177 manageable(uintx, MinHeapFreeRatio, 40, \
3178 "The minimum percentage of heap free after GC to avoid expansion."\
3179 " For most GCs this applies to the old generation. In G1 and" \
3180 " ParallelGC it applies to the whole heap.") \
3181 range(0, 100) \
3182 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3183 \
3184 manageable(uintx, MaxHeapFreeRatio, 70, \
3185 "The maximum percentage of heap free after GC to avoid shrinking."\
3186 " For most GCs this applies to the old generation. In G1 and" \
3187 " ParallelGC it applies to the whole heap.") \
3188 range(0, 100) \
3189 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3190 \
3191 product(bool, ShrinkHeapInSteps, true, \
3192 "When disabled, informs the GC to shrink the java heap directly" \
3193 " to the target size at the next full GC rather than requiring" \
3194 " smaller steps during multiple full GCs.") \
3195 \
3196 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3197 "Number of milliseconds per MB of free space in the heap") \
3198 range(0, max_intx) \
3199 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3200 \
3201 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3202 "The minimum change in heap space due to GC (in bytes)") \
3203 range(0, max_uintx) \
3204 \
3205 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3206 "The minimum expansion of Metaspace (in bytes)") \
3207 range(0, max_uintx) \
3208 \
3209 product(uintx, MaxMetaspaceFreeRatio, 70, \
3210 "The maximum percentage of Metaspace free after GC to avoid " \
3211 "shrinking") \
3212 range(0, 100) \
3213 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3214 \
3215 product(uintx, MinMetaspaceFreeRatio, 40, \
3216 "The minimum percentage of Metaspace free after GC to avoid " \
3217 "expansion") \
3218 range(0, 99) \
3219 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3220 \
3221 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3222 "The maximum expansion of Metaspace without full GC (in bytes)") \
3223 range(0, max_uintx) \
3224 \
3225 product(uintx, QueuedAllocationWarningCount, 0, \
3226 "Number of times an allocation that queues behind a GC " \
3227 "will retry before printing a warning") \
3228 range(0, max_uintx) \
3229 \
3230 diagnostic(uintx, VerifyGCStartAt, 0, \
3231 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3232 range(0, max_uintx) \
3233 \
3234 diagnostic(intx, VerifyGCLevel, 0, \
3235 "Generation level at which to start +VerifyBefore/AfterGC") \
3236 range(0, 1) \
3237 \
3238 product(uintx, MaxTenuringThreshold, 15, \
3239 "Maximum value for tenuring threshold") \
3240 range(0, markOopDesc::max_age + 1) \
3241 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3242 \
3243 product(uintx, InitialTenuringThreshold, 7, \
3244 "Initial value for tenuring threshold") \
3245 range(0, markOopDesc::max_age + 1) \
3246 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3247 \
3248 product(uintx, TargetSurvivorRatio, 50, \
3249 "Desired percentage of survivor space used after scavenge") \
3250 range(0, 100) \
3251 \
3252 product(uintx, MarkSweepDeadRatio, 5, \
3253 "Percentage (0-100) of the old gen allowed as dead wood. " \
3254 "Serial mark sweep treats this as both the minimum and maximum " \
3255 "value. " \
3256 "CMS uses this value only if it falls back to mark sweep. " \
3257 "Par compact uses a variable scale based on the density of the " \
3258 "generation and treats this as the maximum value when the heap " \
3259 "is either completely full or completely empty. Par compact " \
3260 "also has a smaller default value; see arguments.cpp.") \
3261 range(0, 100) \
3262 \
3263 product(uint, MarkSweepAlwaysCompactCount, 4, \
3264 "How often should we fully compact the heap (ignoring the dead " \
3265 "space parameters)") \
3266 range(1, max_juint) \
3267 \
3268 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3269 "Delay between expansion and allocation (in milliseconds)") \
3270 \
3271 develop(uintx, GCWorkerDelayMillis, 0, \
3272 "Delay in scheduling GC workers (in milliseconds)") \
3273 \
3274 product(bool, PSChunkLargeArrays, true, \
3275 "Process large arrays in chunks") \
3276 \
3277 product(uintx, GCDrainStackTargetSize, 64, \
3278 "Number of entries we will try to leave on the stack " \
3279 "during parallel gc") \
3280 range(0, max_juint) \
3281 \
3282 /* stack parameters */ \
3283 product_pd(intx, StackYellowPages, \
3284 "Number of yellow zone (recoverable overflows) pages of size " \
3285 "4KB. If pages are bigger yellow zone is aligned up.") \
3286 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3287 \
3288 product_pd(intx, StackRedPages, \
3289 "Number of red zone (unrecoverable overflows) pages of size " \
3290 "4KB. If pages are bigger red zone is aligned up.") \
3291 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3292 \
3293 product_pd(intx, StackReservedPages, \
3294 "Number of reserved zone (reserved to annotated methods) pages" \
3295 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3296 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3297 \
3298 product(bool, RestrictReservedStack, true, \
3299 "Restrict @ReservedStackAccess to trusted classes") \
3300 \
3301 /* greater stack shadow pages can't generate instruction to bang stack */ \
3302 product_pd(intx, StackShadowPages, \
3303 "Number of shadow zone (for overflow checking) pages of size " \
3304 "4KB. If pages are bigger shadow zone is aligned up. " \
3305 "This should exceed the depth of the VM and native call stack.") \
3306 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3307 \
3308 product_pd(intx, ThreadStackSize, \
3309 "Thread Stack Size (in Kbytes)") \
3310 range(0, 1 * M) \
3311 \
3312 product_pd(intx, VMThreadStackSize, \
3313 "Non-Java Thread Stack Size (in Kbytes)") \
3314 range(0, max_intx/(1 * K)) \
3315 \
3316 product_pd(intx, CompilerThreadStackSize, \
3317 "Compiler Thread Stack Size (in Kbytes)") \
3318 range(0, max_intx/(1 * K)) \
3319 \
3320 develop_pd(size_t, JVMInvokeMethodSlack, \
3321 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3322 \
3323 /* code cache parameters */ \
3324 develop_pd(uintx, CodeCacheSegmentSize, \
3325 "Code cache segment size (in bytes) - smallest unit of " \
3326 "allocation") \
3327 range(1, 1024) \
3328 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3329 \
3330 develop_pd(intx, CodeEntryAlignment, \
3331 "Code entry alignment for generated code (in bytes)") \
3332 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3333 \
3334 product_pd(intx, OptoLoopAlignment, \
3335 "Align inner loops to zero relative to this modulus") \
3336 range(1, 16) \
3337 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3338 \
3339 product_pd(uintx, InitialCodeCacheSize, \
3340 "Initial code cache size (in bytes)") \
3341 range(os::vm_page_size(), max_uintx) \
3342 \
3343 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3344 "Minimum code cache size (in bytes) required to start VM.") \
3345 range(0, max_uintx) \
3346 \
3347 product(bool, SegmentedCodeCache, false, \
3348 "Use a segmented code cache") \
3349 \
3350 product_pd(uintx, ReservedCodeCacheSize, \
3351 "Reserved code cache size (in bytes) - maximum code cache size") \
3352 range(os::vm_page_size(), max_uintx) \
3353 \
3354 product_pd(uintx, NonProfiledCodeHeapSize, \
3355 "Size of code heap with non-profiled methods (in bytes)") \
3356 range(0, max_uintx) \
3357 \
3358 product_pd(uintx, ProfiledCodeHeapSize, \
3359 "Size of code heap with profiled methods (in bytes)") \
3360 range(0, max_uintx) \
3361 \
3362 product_pd(uintx, NonNMethodCodeHeapSize, \
3363 "Size of code heap with non-nmethods (in bytes)") \
3364 range(os::vm_page_size(), max_uintx) \
3365 \
3366 product_pd(uintx, CodeCacheExpansionSize, \
3367 "Code cache expansion size (in bytes)") \
3368 range(32*K, max_uintx) \
3369 \
3370 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
3371 "Minimum number of segments in a code cache block") \
3372 range(1, 100) \
3373 \
3374 notproduct(bool, ExitOnFullCodeCache, false, \
3375 "Exit the VM if we fill the code cache") \
3376 \
3377 product(bool, UseCodeCacheFlushing, true, \
3378 "Remove cold/old nmethods from the code cache") \
3379 \
3380 product(uintx, StartAggressiveSweepingAt, 10, \
3381 "Start aggressive sweeping if X[%] of the code cache is free." \
3382 "Segmented code cache: X[%] of the non-profiled heap." \
3383 "Non-segmented code cache: X[%] of the total code cache") \
3384 range(0, 100) \
3385 \
3386 /* AOT parameters */ \
3387 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \
3388 "Use AOT compiled files") \
3389 \
3390 product(ccstrlist, AOTLibrary, NULL, \
3391 "AOT library") \
3392 \
3393 product(bool, PrintAOT, false, \
3394 "Print used AOT klasses and methods") \
3395 \
3396 notproduct(bool, PrintAOTStatistics, false, \
3397 "Print AOT statistics") \
3398 \
3399 diagnostic(bool, UseAOTStrictLoading, false, \
3400 "Exit the VM if any of the AOT libraries has invalid config") \
3401 \
3402 product(bool, CalculateClassFingerprint, false, \
3403 "Calculate class fingerprint") \
3404 \
3405 /* interpreter debugging */ \
3406 develop(intx, BinarySwitchThreshold, 5, \
3407 "Minimal number of lookupswitch entries for rewriting to binary " \
3408 "switch") \
3409 \
3410 develop(intx, StopInterpreterAt, 0, \
3411 "Stop interpreter execution at specified bytecode number") \
3412 \
3413 develop(intx, TraceBytecodesAt, 0, \
3414 "Trace bytecodes starting with specified bytecode number") \
3415 \
3416 /* compiler interface */ \
3417 develop(intx, CIStart, 0, \
3418 "The id of the first compilation to permit") \
3419 \
3420 develop(intx, CIStop, max_jint, \
3421 "The id of the last compilation to permit") \
3422 \
3423 develop(intx, CIStartOSR, 0, \
3424 "The id of the first osr compilation to permit " \
3425 "(CICountOSR must be on)") \
3426 \
3427 develop(intx, CIStopOSR, max_jint, \
3428 "The id of the last osr compilation to permit " \
3429 "(CICountOSR must be on)") \
3430 \
3431 develop(intx, CIBreakAtOSR, -1, \
3432 "The id of osr compilation to break at") \
3433 \
3434 develop(intx, CIBreakAt, -1, \
3435 "The id of compilation to break at") \
3436 \
3437 product(ccstrlist, CompileOnly, "", \
3438 "List of methods (pkg/class.name) to restrict compilation to") \
3439 \
3440 product(ccstr, CompileCommandFile, NULL, \
3441 "Read compiler commands from this file [.hotspot_compiler]") \
3442 \
3443 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3444 "Read compiler directives from this file") \
3445 \
3446 product(ccstrlist, CompileCommand, "", \
3447 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3448 \
3449 develop(bool, ReplayCompiles, false, \
3450 "Enable replay of compilations from ReplayDataFile") \
3451 \
3452 product(ccstr, ReplayDataFile, NULL, \
3453 "File containing compilation replay information" \
3454 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3455 \
3456 product(ccstr, InlineDataFile, NULL, \
3457 "File containing inlining replay information" \
3458 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3459 \
3460 develop(intx, ReplaySuppressInitializers, 2, \
3461 "Control handling of class initialization during replay: " \
3462 "0 - don't do anything special; " \
3463 "1 - treat all class initializers as empty; " \
3464 "2 - treat class initializers for application classes as empty; " \
3465 "3 - allow all class initializers to run during bootstrap but " \
3466 " pretend they are empty after starting replay") \
3467 range(0, 3) \
3468 \
3469 develop(bool, ReplayIgnoreInitErrors, false, \
3470 "Ignore exceptions thrown during initialization for replay") \
3471 \
3472 product(bool, DumpReplayDataOnError, true, \
3473 "Record replay data for crashing compiler threads") \
3474 \
3475 product(bool, CICompilerCountPerCPU, false, \
3476 "1 compiler thread for log(N CPUs)") \
3477 \
3478 develop(intx, CIFireOOMAt, -1, \
3479 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3480 "(non-negative value throws OOM after this many CI accesses " \
3481 "in each compile)") \
3482 notproduct(intx, CICrashAt, -1, \
3483 "id of compilation to trigger assert in compiler thread for " \
3484 "the purpose of testing, e.g. generation of replay data") \
3485 notproduct(bool, CIObjectFactoryVerify, false, \
3486 "enable potentially expensive verification in ciObjectFactory") \
3487 \
3488 /* Priorities */ \
3489 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3490 \
3491 product(intx, ThreadPriorityPolicy, 0, \
3492 "0 : Normal. "\
3493 " VM chooses priorities that are appropriate for normal "\
3494 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3495 " to normal native priority. Java priorities below " \
3496 " NORM_PRIORITY map to lower native priority values. On "\
3497 " Windows applications are allowed to use higher native "\
3498 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3499 " not use the highest possible native priority, "\
3500 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3501 " system threads. On Linux thread priorities are ignored "\
3502 " because the OS does not support static priority in "\
3503 " SCHED_OTHER scheduling class which is the only choice for "\
3504 " non-root, non-realtime applications. "\
3505 "1 : Aggressive. "\
3506 " Java thread priorities map over to the entire range of "\
3507 " native thread priorities. Higher Java thread priorities map "\
3508 " to higher native thread priorities. This policy should be "\
3509 " used with care, as sometimes it can cause performance "\
3510 " degradation in the application and/or the entire system. On "\
3511 " Linux this policy requires root privilege.") \
3512 range(0, 1) \
3513 \
3514 product(bool, ThreadPriorityVerbose, false, \
3515 "Print priority changes") \
3516 \
3517 product(intx, CompilerThreadPriority, -1, \
3518 "The native priority at which compiler threads should run " \
3519 "(-1 means no change)") \
3520 range(min_jint, max_jint) \
3521 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3522 \
3523 product(intx, VMThreadPriority, -1, \
3524 "The native priority at which the VM thread should run " \
3525 "(-1 means no change)") \
3526 range(-1, 127) \
3527 \
3528 product(bool, CompilerThreadHintNoPreempt, false, \
3529 "(Solaris only) Give compiler threads an extra quanta") \
3530 \
3531 product(bool, VMThreadHintNoPreempt, false, \
3532 "(Solaris only) Give VM thread an extra quanta") \
3533 \
3534 product(intx, JavaPriority1_To_OSPriority, -1, \
3535 "Map Java priorities to OS priorities") \
3536 range(-1, 127) \
3537 \
3538 product(intx, JavaPriority2_To_OSPriority, -1, \
3539 "Map Java priorities to OS priorities") \
3540 range(-1, 127) \
3541 \
3542 product(intx, JavaPriority3_To_OSPriority, -1, \
3543 "Map Java priorities to OS priorities") \
3544 range(-1, 127) \
3545 \
3546 product(intx, JavaPriority4_To_OSPriority, -1, \
3547 "Map Java priorities to OS priorities") \
3548 range(-1, 127) \
3549 \
3550 product(intx, JavaPriority5_To_OSPriority, -1, \
3551 "Map Java priorities to OS priorities") \
3552 range(-1, 127) \
3553 \
3554 product(intx, JavaPriority6_To_OSPriority, -1, \
3555 "Map Java priorities to OS priorities") \
3556 range(-1, 127) \
3557 \
3558 product(intx, JavaPriority7_To_OSPriority, -1, \
3559 "Map Java priorities to OS priorities") \
3560 range(-1, 127) \
3561 \
3562 product(intx, JavaPriority8_To_OSPriority, -1, \
3563 "Map Java priorities to OS priorities") \
3564 range(-1, 127) \
3565 \
3566 product(intx, JavaPriority9_To_OSPriority, -1, \
3567 "Map Java priorities to OS priorities") \
3568 range(-1, 127) \
3569 \
3570 product(intx, JavaPriority10_To_OSPriority,-1, \
3571 "Map Java priorities to OS priorities") \
3572 range(-1, 127) \
3573 \
3574 experimental(bool, UseCriticalJavaThreadPriority, false, \
3575 "Java thread priority 10 maps to critical scheduling priority") \
3576 \
3577 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3578 "Compiler thread(s) run at critical scheduling priority") \
3579 \
3580 experimental(bool, UseCriticalCMSThreadPriority, false, \
3581 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3582 \
3583 /* compiler debugging */ \
3584 notproduct(intx, CompileTheWorldStartAt, 1, \
3585 "First class to consider when using +CompileTheWorld") \
3586 \
3587 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3588 "Last class to consider when using +CompileTheWorld") \
3589 \
3590 develop(intx, NewCodeParameter, 0, \
3591 "Testing Only: Create a dedicated integer parameter before " \
3592 "putback") \
3593 \
3594 /* new oopmap storage allocation */ \
3595 develop(intx, MinOopMapAllocation, 8, \
3596 "Minimum number of OopMap entries in an OopMapSet") \
3597 \
3598 /* Background Compilation */ \
3599 develop(intx, LongCompileThreshold, 50, \
3600 "Used with +TraceLongCompiles") \
3601 \
3602 /* recompilation */ \
3603 product_pd(intx, CompileThreshold, \
3604 "number of interpreted method invocations before (re-)compiling") \
3605 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3606 \
3607 product(double, CompileThresholdScaling, 1.0, \
3608 "Factor to control when first compilation happens " \
3609 "(both with and without tiered compilation): " \
3610 "values greater than 1.0 delay counter overflow, " \
3611 "values between 0 and 1.0 rush counter overflow, " \
3612 "value of 1.0 leaves compilation thresholds unchanged " \
3613 "value of 0.0 is equivalent to -Xint. " \
3614 "" \
3615 "Flag can be set as per-method option. " \
3616 "If a value is specified for a method, compilation thresholds " \
3617 "for that method are scaled by both the value of the global flag "\
3618 "and the value of the per-method flag.") \
3619 range(0.0, DBL_MAX) \
3620 \
3621 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3622 "Interpreter (tier 0) invocation notification frequency") \
3623 range(0, 30) \
3624 \
3625 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3626 "C1 without MDO (tier 2) invocation notification frequency") \
3627 range(0, 30) \
3628 \
3629 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3630 "C1 with MDO profiling (tier 3) invocation notification " \
3631 "frequency") \
3632 range(0, 30) \
3633 \
3634 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3635 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3636 range(0, 30) \
3637 \
3638 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3639 "Interpreter (tier 0) invocation notification frequency") \
3640 range(0, 30) \
3641 \
3642 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3643 "C1 without MDO (tier 2) invocation notification frequency") \
3644 range(0, 30) \
3645 \
3646 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3647 "C1 with MDO profiling (tier 3) invocation notification " \
3648 "frequency") \
3649 range(0, 30) \
3650 \
3651 product(intx, Tier2CompileThreshold, 0, \
3652 "threshold at which tier 2 compilation is invoked") \
3653 range(0, max_jint) \
3654 \
3655 product(intx, Tier2BackEdgeThreshold, 0, \
3656 "Back edge threshold at which tier 2 compilation is invoked") \
3657 range(0, max_jint) \
3658 \
3659 product(intx, Tier3InvocationThreshold, 200, \
3660 "Compile if number of method invocations crosses this " \
3661 "threshold") \
3662 range(0, max_jint) \
3663 \
3664 product(intx, Tier3MinInvocationThreshold, 100, \
3665 "Minimum invocation to compile at tier 3") \
3666 range(0, max_jint) \
3667 \
3668 product(intx, Tier3CompileThreshold, 2000, \
3669 "Threshold at which tier 3 compilation is invoked (invocation " \
3670 "minimum must be satisfied)") \
3671 range(0, max_jint) \
3672 \
3673 product(intx, Tier3BackEdgeThreshold, 60000, \
3674 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3675 range(0, max_jint) \
3676 \
3677 product(intx, Tier3AOTInvocationThreshold, 10000, \
3678 "Compile if number of method invocations crosses this " \
3679 "threshold if coming from AOT") \
3680 range(0, max_jint) \
3681 \
3682 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
3683 "Minimum invocation to compile at tier 3 if coming from AOT") \
3684 range(0, max_jint) \
3685 \
3686 product(intx, Tier3AOTCompileThreshold, 15000, \
3687 "Threshold at which tier 3 compilation is invoked (invocation " \
3688 "minimum must be satisfied) if coming from AOT") \
3689 range(0, max_jint) \
3690 \
3691 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
3692 "Back edge threshold at which tier 3 OSR compilation is invoked " \
3693 "if coming from AOT") \
3694 range(0, max_jint) \
3695 \
3696 product(intx, Tier4InvocationThreshold, 5000, \
3697 "Compile if number of method invocations crosses this " \
3698 "threshold") \
3699 range(0, max_jint) \
3700 \
3701 product(intx, Tier4MinInvocationThreshold, 600, \
3702 "Minimum invocation to compile at tier 4") \
3703 range(0, max_jint) \
3704 \
3705 product(intx, Tier4CompileThreshold, 15000, \
3706 "Threshold at which tier 4 compilation is invoked (invocation " \
3707 "minimum must be satisfied") \
3708 range(0, max_jint) \
3709 \
3710 product(intx, Tier4BackEdgeThreshold, 40000, \
3711 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3712 range(0, max_jint) \
3713 \
3714 product(intx, Tier3DelayOn, 5, \
3715 "If C2 queue size grows over this amount per compiler thread " \
3716 "stop compiling at tier 3 and start compiling at tier 2") \
3717 range(0, max_jint) \
3718 \
3719 product(intx, Tier3DelayOff, 2, \
3720 "If C2 queue size is less than this amount per compiler thread " \
3721 "allow methods compiled at tier 2 transition to tier 3") \
3722 range(0, max_jint) \
3723 \
3724 product(intx, Tier3LoadFeedback, 5, \
3725 "Tier 3 thresholds will increase twofold when C1 queue size " \
3726 "reaches this amount per compiler thread") \
3727 range(0, max_jint) \
3728 \
3729 product(intx, Tier4LoadFeedback, 3, \
3730 "Tier 4 thresholds will increase twofold when C2 queue size " \
3731 "reaches this amount per compiler thread") \
3732 range(0, max_jint) \
3733 \
3734 product(intx, TieredCompileTaskTimeout, 50, \
3735 "Kill compile task if method was not used within " \
3736 "given timeout in milliseconds") \
3737 range(0, max_intx) \
3738 \
3739 product(intx, TieredStopAtLevel, 4, \
3740 "Stop at given compilation level") \
3741 range(0, 4) \
3742 \
3743 product(intx, Tier0ProfilingStartPercentage, 200, \
3744 "Start profiling in interpreter if the counters exceed tier 3 " \
3745 "thresholds by the specified percentage") \
3746 range(0, max_jint) \
3747 \
3748 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3749 "Increase the compile threshold for C1 compilation if the code " \
3750 "cache is filled by the specified percentage") \
3751 range(0, 99) \
3752 \
3753 product(intx, TieredRateUpdateMinTime, 1, \
3754 "Minimum rate sampling interval (in milliseconds)") \
3755 range(0, max_intx) \
3756 \
3757 product(intx, TieredRateUpdateMaxTime, 25, \
3758 "Maximum rate sampling interval (in milliseconds)") \
3759 range(0, max_intx) \
3760 \
3761 product_pd(bool, TieredCompilation, \
3762 "Enable tiered compilation") \
3763 \
3764 product(bool, PrintTieredEvents, false, \
3765 "Print tiered events notifications") \
3766 \
3767 product_pd(intx, OnStackReplacePercentage, \
3768 "NON_TIERED number of method invocations/branches (expressed as " \
3769 "% of CompileThreshold) before (re-)compiling OSR code") \
3770 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3771 \
3772 product(intx, InterpreterProfilePercentage, 33, \
3773 "NON_TIERED number of method invocations/branches (expressed as " \
3774 "% of CompileThreshold) before profiling in the interpreter") \
3775 range(0, 100) \
3776 \
3777 develop(intx, MaxRecompilationSearchLength, 10, \
3778 "The maximum number of frames to inspect when searching for " \
3779 "recompilee") \
3780 \
3781 develop(intx, MaxInterpretedSearchLength, 3, \
3782 "The maximum number of interpreted frames to skip when searching "\
3783 "for recompilee") \
3784 \
3785 develop(intx, DesiredMethodLimit, 8000, \
3786 "The desired maximum method size (in bytecodes) after inlining") \
3787 \
3788 develop(intx, HugeMethodLimit, 8000, \
3789 "Don't compile methods larger than this if " \
3790 "+DontCompileHugeMethods") \
3791 \
3792 /* New JDK 1.4 reflection implementation */ \
3793 \
3794 develop(intx, FastSuperclassLimit, 8, \
3795 "Depth of hardwired instanceof accelerator array") \
3796 \
3797 /* Properties for Java libraries */ \
3798 \
3799 product(uint64_t, MaxDirectMemorySize, 0, \
3800 "Maximum total size of NIO direct-buffer allocations") \
3801 range(0, max_jlong) \
3802 \
3803 /* Flags used for temporary code during development */ \
3804 \
3805 diagnostic(bool, UseNewCode, false, \
3806 "Testing Only: Use the new version while testing") \
3807 \
3808 diagnostic(bool, UseNewCode2, false, \
3809 "Testing Only: Use the new version while testing") \
3810 \
3811 diagnostic(bool, UseNewCode3, false, \
3812 "Testing Only: Use the new version while testing") \
3813 \
3814 /* flags for performance data collection */ \
3815 \
3816 product(bool, UsePerfData, true, \
3817 "Flag to disable jvmstat instrumentation for performance testing "\
3818 "and problem isolation purposes") \
3819 \
3820 product(bool, PerfDataSaveToFile, false, \
3821 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3822 \
3823 product(ccstr, PerfDataSaveFile, NULL, \
3824 "Save PerfData memory to the specified absolute pathname. " \
3825 "The string %p in the file name (if present) " \
3826 "will be replaced by pid") \
3827 \
3828 product(intx, PerfDataSamplingInterval, 50, \
3829 "Data sampling interval (in milliseconds)") \
3830 range(PeriodicTask::min_interval, max_jint) \
3831 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3832 \
3833 product(bool, PerfDisableSharedMem, false, \
3834 "Store performance data in standard memory") \
3835 \
3836 product(intx, PerfDataMemorySize, 32*K, \
3837 "Size of performance data memory region. Will be rounded " \
3838 "up to a multiple of the native os page size.") \
3839 range(128, 32*64*K) \
3840 \
3841 product(intx, PerfMaxStringConstLength, 1024, \
3842 "Maximum PerfStringConstant string length before truncation") \
3843 range(32, 32*K) \
3844 \
3845 product(bool, PerfAllowAtExitRegistration, false, \
3846 "Allow registration of atexit() methods") \
3847 \
3848 product(bool, PerfBypassFileSystemCheck, false, \
3849 "Bypass Win32 file system criteria checks (Windows Only)") \
3850 \
3851 product(intx, UnguardOnExecutionViolation, 0, \
3852 "Unguard page and retry on no-execute fault (Win32 only) " \
3853 "0=off, 1=conservative, 2=aggressive") \
3854 range(0, 2) \
3855 \
3856 /* Serviceability Support */ \
3857 \
3858 product(bool, ManagementServer, false, \
3859 "Create JMX Management Server") \
3860 \
3861 product(bool, DisableAttachMechanism, false, \
3862 "Disable mechanism that allows tools to attach to this VM") \
3863 \
3864 product(bool, StartAttachListener, false, \
3865 "Always start Attach Listener at VM startup") \
3866 \
3867 product(bool, EnableDynamicAgentLoading, true, \
3868 "Allow tools to load agents with the attach mechanism") \
3869 \
3870 manageable(bool, PrintConcurrentLocks, false, \
3871 "Print java.util.concurrent locks in thread dump") \
3872 \
3873 product(bool, TransmitErrorReport, false, \
3874 "Enable error report transmission on erroneous termination") \
3875 \
3876 product(ccstr, ErrorReportServer, NULL, \
3877 "Override built-in error report server address") \
3878 \
3879 /* Shared spaces */ \
3880 \
3881 product(bool, UseSharedSpaces, true, \
3882 "Use shared spaces for metadata") \
3883 \
3884 product(bool, VerifySharedSpaces, false, \
3885 "Verify shared spaces (false for default archive, true for " \
3886 "archive specified by -XX:SharedArchiveFile)") \
3887 \
3888 product(bool, RequireSharedSpaces, false, \
3889 "Require shared spaces for metadata") \
3890 \
3891 product(bool, DumpSharedSpaces, false, \
3892 "Special mode: JVM reads a class list, loads classes, builds " \
3893 "shared spaces, and dumps the shared spaces to a file to be " \
3894 "used in future JVM runs") \
3895 \
3896 product(bool, PrintSharedArchiveAndExit, false, \
3897 "Print shared archive file contents") \
3898 \
3899 product(bool, PrintSharedDictionary, false, \
3900 "If PrintSharedArchiveAndExit is true, also print the shared " \
3901 "dictionary") \
3902 \
3903 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
3904 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3905 "Address to allocate shared memory region for class data") \
3906 range(0, SIZE_MAX) \
3907 \
3908 product(bool, UseAppCDS, false, \
3909 "Enable Application Class Data Sharing when using shared spaces") \
3910 writeable(CommandLineOnly) \
3911 \
3912 product(ccstr, SharedArchiveConfigFile, NULL, \
3913 "Data to add to the CDS archive file") \
3914 \
3915 product(uintx, SharedSymbolTableBucketSize, 4, \
3916 "Average number of symbols per bucket in shared table") \
3917 range(2, 246) \
3918 \
3919 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \
3920 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3921 "classes. Just exclude them from the shared dictionary.") \
3922 \
3923 diagnostic(bool, PrintMethodHandleStubs, false, \
3924 "Print generated stub code for method handles") \
3925 \
3926 develop(bool, TraceMethodHandles, false, \
3927 "trace internal method handle operations") \
3928 \
3929 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3930 "perform extra checks when constructing method handles") \
3931 \
3932 diagnostic(bool, ShowHiddenFrames, false, \
3933 "show method handle implementation frames (usually hidden)") \
3934 \
3935 experimental(bool, TrustFinalNonStaticFields, false, \
3936 "trust final non-static declarations for constant folding") \
3937 \
3938 diagnostic(bool, FoldStableValues, true, \
3939 "Optimize loads from stable fields (marked w/ @Stable)") \
3940 \
3941 develop(bool, TraceInvokeDynamic, false, \
3942 "trace internal invoke dynamic operations") \
3943 \
3944 diagnostic(int, UseBootstrapCallInfo, 1, \
3945 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
3946 "resolved before the bootstrap method is called; 1: when a BSM " \
3947 "that may accept a BootstrapCallInfo is detected, use that API " \
3948 "to pass BSM arguments, which allows the BSM to delay their " \
3949 "resolution; 2+: stress test the BCI API by calling more BSMs " \
3950 "via that API, instead of with the eagerly-resolved array.") \
3951 \
3952 diagnostic(bool, PauseAtStartup, false, \
3953 "Causes the VM to pause at startup time and wait for the pause " \
3954 "file to be removed (default: ./vm.paused.<pid>)") \
3955 \
3956 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3957 "The file to create and for whose removal to await when pausing " \
3958 "at startup. (default: ./vm.paused.<pid>)") \
3959 \
3960 diagnostic(bool, PauseAtExit, false, \
3961 "Pause and wait for keypress on exit if a debugger is attached") \
3962 \
3963 product(bool, ExtendedDTraceProbes, false, \
3964 "Enable performance-impacting dtrace probes") \
3965 \
3966 product(bool, DTraceMethodProbes, false, \
3967 "Enable dtrace probes for method-entry and method-exit") \
3968 \
3969 product(bool, DTraceAllocProbes, false, \
3970 "Enable dtrace probes for object allocation") \
3971 \
3972 product(bool, DTraceMonitorProbes, false, \
3973 "Enable dtrace probes for monitor events") \
3974 \
3975 product(bool, RelaxAccessControlCheck, false, \
3976 "Relax the access control checks in the verifier") \
3977 \
3978 product(uintx, StringTableSize, defaultStringTableSize, \
3979 "Number of buckets in the interned String table") \
3980 range(minimumStringTableSize, 111*defaultStringTableSize) \
3981 \
3982 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
3983 "Number of buckets in the JVM internal Symbol table") \
3984 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
3985 \
3986 product(bool, UseStringDeduplication, false, \
3987 "Use string deduplication") \
3988 \
3989 product(uintx, StringDeduplicationAgeThreshold, 3, \
3990 "A string must reach this age (or be promoted to an old region) " \
3991 "to be considered for deduplication") \
3992 range(1, markOopDesc::max_age) \
3993 \
3994 diagnostic(bool, StringDeduplicationResizeALot, false, \
3995 "Force table resize every time the table is scanned") \
3996 \
3997 diagnostic(bool, StringDeduplicationRehashALot, false, \
3998 "Force table rehash every time the table is scanned") \
3999 \
4000 diagnostic(bool, WhiteBoxAPI, false, \
4001 "Enable internal testing APIs") \
4002 \
4003 experimental(intx, SurvivorAlignmentInBytes, 0, \
4004 "Default survivor space alignment in bytes") \
4005 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4006 \
4007 product(bool , AllowNonVirtualCalls, false, \
4008 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4009 \
4010 product(ccstr, DumpLoadedClassList, NULL, \
4011 "Dump the names all loaded classes, that could be stored into " \
4012 "the CDS archive, in the specified file") \
4013 \
4014 product(ccstr, SharedClassListFile, NULL, \
4015 "Override the default CDS class list") \
4016 \
4017 diagnostic(ccstr, SharedArchiveFile, NULL, \
4018 "Override the default location of the CDS archive file") \
4019 \
4020 product(ccstr, ExtraSharedClassListFile, NULL, \
4021 "Extra classlist for building the CDS archive file") \
4022 \
4023 experimental(size_t, ArrayAllocatorMallocLimit, \
4024 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4025 "Allocation less than this value will be allocated " \
4026 "using malloc. Larger allocations will use mmap.") \
4027 \
4028 experimental(bool, AlwaysAtomicAccesses, false, \
4029 "Accesses to all variables should always be atomic") \
4030 \
4031 product(bool, EnableTracing, false, \
4032 "Enable event-based tracing") \
4033 \
4034 product(bool, UseLockedTracing, false, \
4035 "Use locked-tracing when doing event-based tracing") \
4036 \
4037 diagnostic(bool, UseUnalignedAccesses, false, \
4038 "Use unaligned memory accesses in Unsafe") \
4039 \
4040 product_pd(bool, PreserveFramePointer, \
4041 "Use the FP register for holding the frame pointer " \
4042 "and not as a general purpose register.") \
4043 \
4044 diagnostic(bool, CheckIntrinsics, true, \
4045 "When a class C is loaded, check that " \
4046 "(1) all intrinsics defined by the VM for class C are present "\
4047 "in the loaded class file and are marked with the " \
4048 "@HotSpotIntrinsicCandidate annotation, that " \
4049 "(2) there is an intrinsic registered for all loaded methods " \
4050 "that are annotated with the @HotSpotIntrinsicCandidate " \
4051 "annotation, and that " \
4052 "(3) no orphan methods exist for class C (i.e., methods for " \
4053 "which the VM declares an intrinsic but that are not declared "\
4054 "in the loaded class C. " \
4055 "Check (3) is available only in debug builds.") \
4056 \
4057 diagnostic_pd(intx, InitArrayShortSize, \
4058 "Threshold small size (in bytes) for clearing arrays. " \
4059 "Anything this size or smaller may get converted to discrete " \
4060 "scalar stores.") \
4061 range(0, max_intx) \
4062 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
4063 \
4064 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4065 "Disable backwards compatibility for compile commands.") \
4066 \
4067 diagnostic(bool, CompilerDirectivesPrint, false, \
4068 "Print compiler directives on installation.") \
4069 diagnostic(int, CompilerDirectivesLimit, 50, \
4070 "Limit on number of compiler directives.") \
4071 \
4072 product(ccstr, AllocateHeapAt, NULL, \
4073 "Path to the directoy where a temporary file will be created " \
4074 "to use as the backing store for Java Heap.") \
4075 \
4076 develop(bool, VerifyMetaspace, false, \
4077 "Verify metaspace on chunk movements.") \
4078 \
4079 diagnostic(bool, ShowRegistersOnAssert, false, \
4080 "On internal errors, include registers in error report.") \
4081 \
4082
4083
4084
4085 /*
4086 * Macros for factoring of globals
4087 */
4088
4089 // Interface macros
4090 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4091 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4092 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4093 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
4094 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4095 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4096 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4097 #ifdef PRODUCT
4098 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4099 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4100 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4101 #else
4102 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4103 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4104 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4105 #endif // PRODUCT
4106 // Special LP64 flags, product only needed for now.
4107 #ifdef _LP64
4108 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4109 #else
4110 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4111 #endif // _LP64
4112
4113 // Implementation macros
4114 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4115 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4116 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4117 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name;
4118 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4119 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4120 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4121 #ifdef PRODUCT
4122 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4123 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4124 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4125 #else
4126 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4127 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4128 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4129 #endif // PRODUCT
4130 #ifdef _LP64
4131 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4132 #else
4133 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4134 #endif // _LP64
4135
4136 // Only materialize src code for range checking when required, ignore otherwise
4137 #define IGNORE_RANGE(a, b)
4138 // Only materialize src code for contraint checking when required, ignore otherwise
4139 #define IGNORE_CONSTRAINT(func,type)
4140
4141 #define IGNORE_WRITEABLE(type)
4142
4143 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4144 DECLARE_PD_DEVELOPER_FLAG, \
4145 DECLARE_PRODUCT_FLAG, \
4146 DECLARE_PD_PRODUCT_FLAG, \
4147 DECLARE_DIAGNOSTIC_FLAG, \
4148 DECLARE_PD_DIAGNOSTIC_FLAG, \
4149 DECLARE_EXPERIMENTAL_FLAG, \
4150 DECLARE_NOTPRODUCT_FLAG, \
4151 DECLARE_MANAGEABLE_FLAG, \
4152 DECLARE_PRODUCT_RW_FLAG, \
4153 DECLARE_LP64_PRODUCT_FLAG, \
4154 IGNORE_RANGE, \
4155 IGNORE_CONSTRAINT, \
4156 IGNORE_WRITEABLE)
4157
4158 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4159 DECLARE_PD_DEVELOPER_FLAG, \
4160 DECLARE_PRODUCT_FLAG, \
4161 DECLARE_PD_PRODUCT_FLAG, \
4162 DECLARE_DIAGNOSTIC_FLAG, \
4163 DECLARE_PD_DIAGNOSTIC_FLAG, \
4164 DECLARE_NOTPRODUCT_FLAG, \
4165 IGNORE_RANGE, \
4166 IGNORE_CONSTRAINT, \
4167 IGNORE_WRITEABLE)
4168
4169 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4170 DECLARE_PRODUCT_FLAG, \
4171 DECLARE_DIAGNOSTIC_FLAG, \
4172 DECLARE_EXPERIMENTAL_FLAG, \
4173 DECLARE_NOTPRODUCT_FLAG, \
4174 IGNORE_RANGE, \
4175 IGNORE_CONSTRAINT, \
4176 IGNORE_WRITEABLE)
4177
4178 // Extensions
4179
4180 #include "runtime/globals_ext.hpp"
4181
4182 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP