1 /*
2 * Copyright (c) 1997, 2017, 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 #ifdef SHARK
67 #ifdef ZERO
68 # include "shark_globals_zero.hpp"
69 #endif
70 #endif
71
72 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
73 define_pd_global(bool, BackgroundCompilation, false);
74 define_pd_global(bool, UseTLAB, false);
75 define_pd_global(bool, CICompileOSR, false);
76 define_pd_global(bool, UseTypeProfile, false);
77 define_pd_global(bool, UseOnStackReplacement, false);
78 define_pd_global(bool, InlineIntrinsics, false);
79 define_pd_global(bool, PreferInterpreterNativeStubs, true);
80 define_pd_global(bool, ProfileInterpreter, false);
81 define_pd_global(bool, ProfileTraps, false);
82 define_pd_global(bool, TieredCompilation, false);
83
84 define_pd_global(intx, CompileThreshold, 0);
85
86 define_pd_global(intx, OnStackReplacePercentage, 0);
87 define_pd_global(bool, ResizeTLAB, false);
88 define_pd_global(intx, FreqInlineSize, 0);
89 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
90 define_pd_global(intx, InlineClassNatives, true);
91 define_pd_global(intx, InlineUnsafeOps, true);
92 define_pd_global(intx, InitialCodeCacheSize, 160*K);
93 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
94 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
95 define_pd_global(intx, ProfiledCodeHeapSize, 0);
96 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
97
98 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
99 define_pd_global(intx, CodeCacheMinBlockLength, 1);
100 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
101 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
102 define_pd_global(bool, NeverActAsServerClassMachine, true);
103 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
104 #define CI_COMPILER_COUNT 0
105 #else
106
107 #if defined(COMPILER2) || INCLUDE_JVMCI
108 #define CI_COMPILER_COUNT 2
109 #else
110 #define CI_COMPILER_COUNT 1
111 #endif // COMPILER2 || INCLUDE_JVMCI
112
113 #endif // no compilers
114
115 // string type aliases used only in this file
116 typedef const char* ccstr;
117 typedef const char* ccstrlist; // represents string arguments which accumulate
118
119 // function type that will construct default range string
120 typedef const char* (*RangeStrFunc)(void);
121
122 struct Flag {
123 enum Flags {
124 // latest value origin
125 DEFAULT = 0,
126 COMMAND_LINE = 1,
127 ENVIRON_VAR = 2,
128 CONFIG_FILE = 3,
129 MANAGEMENT = 4,
130 ERGONOMIC = 5,
131 ATTACH_ON_DEMAND = 6,
132 INTERNAL = 7,
133
134 LAST_VALUE_ORIGIN = INTERNAL,
135 VALUE_ORIGIN_BITS = 4,
136 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
137
138 // flag kind
139 KIND_PRODUCT = 1 << 4,
140 KIND_MANAGEABLE = 1 << 5,
141 KIND_DIAGNOSTIC = 1 << 6,
142 KIND_EXPERIMENTAL = 1 << 7,
143 KIND_NOT_PRODUCT = 1 << 8,
144 KIND_DEVELOP = 1 << 9,
145 KIND_PLATFORM_DEPENDENT = 1 << 10,
146 KIND_READ_WRITE = 1 << 11,
147 KIND_C1 = 1 << 12,
148 KIND_C2 = 1 << 13,
149 KIND_ARCH = 1 << 14,
150 KIND_SHARK = 1 << 15,
151 KIND_LP64_PRODUCT = 1 << 16,
152 KIND_COMMERCIAL = 1 << 17,
153 KIND_JVMCI = 1 << 18,
154
155 // set this bit if the flag was set on the command line
156 ORIG_COMMAND_LINE = 1 << 19,
157
158 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
159 };
160
161 enum Error {
162 // no error
163 SUCCESS = 0,
164 // flag name is missing
165 MISSING_NAME,
166 // flag value is missing
167 MISSING_VALUE,
168 // error parsing the textual form of the value
169 WRONG_FORMAT,
170 // flag is not writable
171 NON_WRITABLE,
172 // flag value is outside of its bounds
173 OUT_OF_BOUNDS,
174 // flag value violates its constraint
175 VIOLATES_CONSTRAINT,
176 // there is no flag with the given name
177 INVALID_FLAG,
178 // the flag can only be set only on command line during invocation of the VM
179 COMMAND_LINE_ONLY,
180 // the flag may only be set once
181 SET_ONLY_ONCE,
182 // the flag is not writable in this combination of product/debug build
183 CONSTANT,
184 // other, unspecified error related to setting the flag
185 ERR_OTHER
186 };
187
188 enum MsgType {
189 NONE = 0,
190 DIAGNOSTIC_FLAG_BUT_LOCKED,
191 EXPERIMENTAL_FLAG_BUT_LOCKED,
192 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
193 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
194 };
195
196 const char* _type;
197 const char* _name;
198 void* _addr;
199 NOT_PRODUCT(const char* _doc;)
200 Flags _flags;
201 size_t _name_len;
202
203 // points to all Flags static array
204 static Flag* flags;
205
206 // number of flags
207 static size_t numFlags;
208
209 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
210 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
211 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
212
213 static const char* get_int_default_range_str();
214 static const char* get_uint_default_range_str();
215 static const char* get_intx_default_range_str();
216 static const char* get_uintx_default_range_str();
217 static const char* get_uint64_t_default_range_str();
218 static const char* get_size_t_default_range_str();
219 static const char* get_double_default_range_str();
220
221 Flag::Error check_writable(bool changed);
222
223 bool is_bool() const;
224 bool get_bool() const;
225 Flag::Error set_bool(bool value);
226
227 bool is_int() const;
228 int get_int() const;
229 Flag::Error set_int(int value);
230
231 bool is_uint() const;
232 uint get_uint() const;
233 Flag::Error set_uint(uint value);
234
235 bool is_intx() const;
236 intx get_intx() const;
237 Flag::Error set_intx(intx value);
238
239 bool is_uintx() const;
240 uintx get_uintx() const;
241 Flag::Error set_uintx(uintx value);
242
243 bool is_uint64_t() const;
244 uint64_t get_uint64_t() const;
245 Flag::Error set_uint64_t(uint64_t value);
246
247 bool is_size_t() const;
248 size_t get_size_t() const;
249 Flag::Error set_size_t(size_t value);
250
251 bool is_double() const;
252 double get_double() const;
253 Flag::Error set_double(double value);
254
255 bool is_ccstr() const;
256 bool ccstr_accumulates() const;
257 ccstr get_ccstr() const;
258 Flag::Error set_ccstr(ccstr value);
259
260 Flags get_origin();
261 void set_origin(Flags origin);
262
263 size_t get_name_length();
264
265 bool is_default();
266 bool is_ergonomic();
267 bool is_command_line();
268 void set_command_line();
269
270 bool is_product() const;
271 bool is_manageable() const;
272 bool is_diagnostic() const;
273 bool is_experimental() const;
274 bool is_notproduct() const;
275 bool is_develop() const;
276 bool is_read_write() const;
277 bool is_commercial() const;
278
279 bool is_constant_in_binary() const;
280
281 bool is_unlocker() const;
282 bool is_unlocked() const;
283 bool is_writeable() const;
284 bool is_external() const;
285
286 bool is_unlocker_ext() const;
287 bool is_unlocked_ext() const;
288 bool is_writeable_ext() const;
289 bool is_external_ext() const;
290
291 void clear_diagnostic();
292
293 Flag::MsgType get_locked_message(char*, int) const;
294 void get_locked_message_ext(char*, int) const;
295
296 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
297 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
298 void print_kind_and_origin(outputStream* st);
299 void print_as_flag(outputStream* st);
300
301 static const char* flag_error_str(Flag::Error error);
302 };
303
304 // debug flags control various aspects of the VM and are global accessible
305
306 // use FlagSetting to temporarily change some debug flag
307 // e.g. FlagSetting fs(DebugThisAndThat, true);
308 // restored to previous value upon leaving scope
309 class FlagSetting {
310 bool val;
311 bool* flag;
312 public:
313 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
314 ~FlagSetting() { *flag = val; }
315 };
316
317
318 class CounterSetting {
319 intx* counter;
320 public:
321 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
322 ~CounterSetting() { (*counter)--; }
323 };
324
325 class IntFlagSetting {
326 int val;
327 int* flag;
328 public:
329 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
330 ~IntFlagSetting() { *flag = val; }
331 };
332
333 class UIntFlagSetting {
334 uint val;
335 uint* flag;
336 public:
337 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
338 ~UIntFlagSetting() { *flag = val; }
339 };
340
341 class UIntXFlagSetting {
342 uintx val;
343 uintx* flag;
344 public:
345 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
346 ~UIntXFlagSetting() { *flag = val; }
347 };
348
349 class DoubleFlagSetting {
350 double val;
351 double* flag;
352 public:
353 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
354 ~DoubleFlagSetting() { *flag = val; }
355 };
356
357 class SizeTFlagSetting {
358 size_t val;
359 size_t* flag;
360 public:
361 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
362 ~SizeTFlagSetting() { *flag = val; }
363 };
364
365 // Helper class for temporarily saving the value of a flag during a scope.
366 template <size_t SIZE>
367 class FlagGuard {
368 unsigned char _value[SIZE];
369 void* const _addr;
370
371 // Hide operator new, this class should only be allocated on the stack.
372 // NOTE: Cannot include memory/allocation.hpp here due to circular
373 // dependencies.
374 void* operator new(size_t size) throw();
375 void* operator new [](size_t size) throw();
376
377 public:
378 FlagGuard(void* flag_addr) : _addr(flag_addr) {
379 memcpy(_value, _addr, SIZE);
380 }
381
382 ~FlagGuard() {
383 memcpy(_addr, _value, SIZE);
384 }
385 };
386
387 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
388
389 class CommandLineFlags {
390 public:
391 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
392 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); }
393 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
394 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
395 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
396
397 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
398 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); }
399 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
400 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
401 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
402
403 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
404 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); }
405 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
406 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
407 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
408
409 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
410 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); }
411 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
412 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
413 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
414
415 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
416 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); }
417 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
418 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
419 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
420
421 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
422 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); }
423 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
424 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
425 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
426
427 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
428 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); }
429 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
430 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
431 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
432
433 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
434 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); }
435 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
436 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
437 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
438
439 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
440 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); }
441 // Contract: Flag will make private copy of the incoming value.
442 // Outgoing value is always malloc-ed, and caller MUST call free.
443 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
444 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
445
446 // Returns false if name is not a command line flag.
447 static bool wasSetOnCmdline(const char* name, bool* value);
448 static void printSetFlags(outputStream* out);
449
450 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
451 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
452
453 static void verify() PRODUCT_RETURN;
454 };
455
456 // use this for flags that are true by default in the debug version but
457 // false in the optimized version, and vice versa
458 #ifdef ASSERT
459 #define trueInDebug true
460 #define falseInDebug false
461 #else
462 #define trueInDebug false
463 #define falseInDebug true
464 #endif
465
466 // use this for flags that are true per default in the product build
467 // but false in development builds, and vice versa
468 #ifdef PRODUCT
469 #define trueInProduct true
470 #define falseInProduct false
471 #else
472 #define trueInProduct false
473 #define falseInProduct true
474 #endif
475
476 // develop flags are settable / visible only during development and are constant in the PRODUCT version
477 // product flags are always settable / visible
478 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
479
480 // A flag must be declared with one of the following types:
481 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
482 // The type "ccstr" is an alias for "const char*" and is used
483 // only in this file, because the macrology requires single-token type names.
484
485 // Note: Diagnostic options not meant for VM tuning or for product modes.
486 // They are to be used for VM quality assurance or field diagnosis
487 // of VM bugs. They are hidden so that users will not be encouraged to
488 // try them as if they were VM ordinary execution options. However, they
489 // are available in the product version of the VM. Under instruction
490 // from support engineers, VM customers can turn them on to collect
491 // diagnostic information about VM problems. To use a VM diagnostic
492 // option, you must first specify +UnlockDiagnosticVMOptions.
493 // (This master switch also affects the behavior of -Xprintflags.)
494 //
495 // experimental flags are in support of features that are not
496 // part of the officially supported product, but are available
497 // for experimenting with. They could, for example, be performance
498 // features that may not have undergone full or rigorous QA, but which may
499 // help performance in some cases and released for experimentation
500 // by the community of users and developers. This flag also allows one to
501 // be able to build a fully supported product that nonetheless also
502 // ships with some unsupported, lightly tested, experimental features.
503 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
504 // UnlockExperimentalVMOptions flag, which allows the control and
505 // modification of the experimental flags.
506 //
507 // Nota bene: neither diagnostic nor experimental options should be used casually,
508 // and they are not supported on production loads, except under explicit
509 // direction from support engineers.
510 //
511 // manageable flags are writeable external product flags.
512 // They are dynamically writeable through the JDK management interface
513 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
514 // These flags are external exported interface (see CCC). The list of
515 // manageable flags can be queried programmatically through the management
516 // interface.
517 //
518 // A flag can be made as "manageable" only if
519 // - the flag is defined in a CCC as an external exported interface.
520 // - the VM implementation supports dynamic setting of the flag.
521 // This implies that the VM must *always* query the flag variable
522 // and not reuse state related to the flag state at any given time.
523 // - you want the flag to be queried programmatically by the customers.
524 //
525 // product_rw flags are writeable internal product flags.
526 // They are like "manageable" flags but for internal/private use.
527 // The list of product_rw flags are internal/private flags which
528 // may be changed/removed in a future release. It can be set
529 // through the management interface to get/set value
530 // when the name of flag is supplied.
531 //
532 // A flag can be made as "product_rw" only if
533 // - the VM implementation supports dynamic setting of the flag.
534 // This implies that the VM must *always* query the flag variable
535 // and not reuse state related to the flag state at any given time.
536 //
537 // Note that when there is a need to support develop flags to be writeable,
538 // it can be done in the same way as product_rw.
539 //
540 // range is a macro that will expand to min and max arguments for range
541 // checking code if provided - see commandLineFlagRangeList.hpp
542 //
543 // constraint is a macro that will expand to custom function call
544 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
545 //
546 // writeable is a macro that controls if and how the value can change during the runtime
547 //
548 // writeable(Always) is optional and allows the flag to have its value changed
549 // without any limitations at any time
550 //
551 // writeable(Once) flag value's can be only set once during the lifetime of VM
552 //
553 // writeable(CommandLineOnly) flag value's can be only set from command line
554 // (multiple times allowed)
555 //
556
557
558 #define RUNTIME_FLAGS(develop, \
559 develop_pd, \
560 product, \
561 product_pd, \
562 diagnostic, \
563 diagnostic_pd, \
564 experimental, \
565 notproduct, \
566 manageable, \
567 product_rw, \
568 lp64_product, \
569 range, \
570 constraint, \
571 writeable) \
572 \
573 lp64_product(bool, UseCompressedOops, false, \
574 "Use 32-bit object references in 64-bit VM. " \
575 "lp64_product means flag is always constant in 32 bit VM") \
576 \
577 lp64_product(bool, UseCompressedClassPointers, false, \
578 "Use 32-bit class pointers in 64-bit VM. " \
579 "lp64_product means flag is always constant in 32 bit VM") \
580 \
581 notproduct(bool, CheckCompressedOops, true, \
582 "Generate checks in encoding/decoding code in debug VM") \
583 \
584 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
585 "Heap allocation steps through preferred address regions to find" \
586 " where it can allocate the heap. Number of steps to take per " \
587 "region.") \
588 range(1, max_uintx) \
589 \
590 lp64_product(intx, ObjectAlignmentInBytes, 8, \
591 "Default object alignment in bytes, 8 is minimum") \
592 range(8, 256) \
593 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
594 \
595 product(bool, AssumeMP, false, \
596 "Instruct the VM to assume multiple processors are available") \
597 \
598 /* UseMembar is theoretically a temp flag used for memory barrier */ \
599 /* removal testing. It was supposed to be removed before FCS but has */ \
600 /* been re-added (see 6401008) */ \
601 product_pd(bool, UseMembar, \
602 "(Unstable) Issues membars on thread state transitions") \
603 \
604 develop(bool, CleanChunkPoolAsync, true, \
605 "Clean the chunk pool asynchronously") \
606 \
607 experimental(bool, AlwaysSafeConstructors, false, \
608 "Force safe construction, as if all fields are final.") \
609 \
610 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
611 "Enable normal processing of flags relating to field diagnostics")\
612 \
613 experimental(bool, UnlockExperimentalVMOptions, false, \
614 "Enable normal processing of flags relating to experimental " \
615 "features") \
616 \
617 product(bool, JavaMonitorsInStackTrace, true, \
618 "Print information about Java monitor locks when the stacks are" \
619 "dumped") \
620 \
621 product_pd(bool, UseLargePages, \
622 "Use large page memory") \
623 \
624 product_pd(bool, UseLargePagesIndividualAllocation, \
625 "Allocate large pages individually for better affinity") \
626 \
627 develop(bool, LargePagesIndividualAllocationInjectError, false, \
628 "Fail large pages individual allocation") \
629 \
630 product(bool, UseLargePagesInMetaspace, false, \
631 "Use large page memory in metaspace. " \
632 "Only used if UseLargePages is enabled.") \
633 \
634 product(bool, UseNUMA, false, \
635 "Use NUMA if available") \
636 \
637 product(bool, UseNUMAInterleaving, false, \
638 "Interleave memory across NUMA nodes if available") \
639 \
640 product(size_t, NUMAInterleaveGranularity, 2*M, \
641 "Granularity to use for NUMA interleaving on Windows OS") \
642 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
643 \
644 product(bool, ForceNUMA, false, \
645 "Force NUMA optimizations on single-node/UMA systems") \
646 \
647 product(uintx, NUMAChunkResizeWeight, 20, \
648 "Percentage (0-100) used to weight the current sample when " \
649 "computing exponentially decaying average for " \
650 "AdaptiveNUMAChunkSizing") \
651 range(0, 100) \
652 \
653 product(size_t, NUMASpaceResizeRate, 1*G, \
654 "Do not reallocate more than this amount per collection") \
655 range(0, max_uintx) \
656 \
657 product(bool, UseAdaptiveNUMAChunkSizing, true, \
658 "Enable adaptive chunk sizing for NUMA") \
659 \
660 product(bool, NUMAStats, false, \
661 "Print NUMA stats in detailed heap information") \
662 \
663 product(uintx, NUMAPageScanRate, 256, \
664 "Maximum number of pages to include in the page scan procedure") \
665 range(0, max_uintx) \
666 \
667 product_pd(bool, NeedsDeoptSuspend, \
668 "True for register window machines (sparc/ia64)") \
669 \
670 product(intx, UseSSE, 99, \
671 "Highest supported SSE instructions set on x86/x64") \
672 range(0, 99) \
673 \
674 product(bool, UseAES, false, \
675 "Control whether AES instructions are used when available") \
676 \
677 product(bool, UseFMA, false, \
678 "Control whether FMA instructions are used when available") \
679 \
680 product(bool, UseSHA, false, \
681 "Control whether SHA instructions are used when available") \
682 \
683 diagnostic(bool, UseGHASHIntrinsics, false, \
684 "Use intrinsics for GHASH versions of crypto") \
685 \
686 product(size_t, LargePageSizeInBytes, 0, \
687 "Large page size (0 to let VM choose the page size)") \
688 range(0, max_uintx) \
689 \
690 product(size_t, LargePageHeapSizeThreshold, 128*M, \
691 "Use large pages if maximum heap is at least this big") \
692 range(0, max_uintx) \
693 \
694 product(bool, ForceTimeHighResolution, false, \
695 "Using high time resolution (for Win32 only)") \
696 \
697 develop(bool, TracePcPatching, false, \
698 "Trace usage of frame::patch_pc") \
699 \
700 develop(bool, TraceRelocator, false, \
701 "Trace the bytecode relocator") \
702 \
703 develop(bool, TraceLongCompiles, false, \
704 "Print out every time compilation is longer than " \
705 "a given threshold") \
706 \
707 develop(bool, SafepointALot, false, \
708 "Generate a lot of safepoints. This works with " \
709 "GuaranteedSafepointInterval") \
710 \
711 product_pd(bool, BackgroundCompilation, \
712 "A thread requesting compilation is not blocked during " \
713 "compilation") \
714 \
715 product(bool, PrintVMQWaitTime, false, \
716 "Print out the waiting time in VM operation queue") \
717 \
718 product(bool, MethodFlushing, true, \
719 "Reclamation of zombie and not-entrant methods") \
720 \
721 develop(bool, VerifyStack, false, \
722 "Verify stack of each thread when it is entering a runtime call") \
723 \
724 diagnostic(bool, ForceUnreachable, false, \
725 "Make all non code cache addresses to be unreachable by " \
726 "forcing use of 64bit literal fixups") \
727 \
728 notproduct(bool, StressDerivedPointers, false, \
729 "Force scavenge when a derived pointer is detected on stack " \
730 "after rtm call") \
731 \
732 develop(bool, TraceDerivedPointers, false, \
733 "Trace traversal of derived pointers on stack") \
734 \
735 notproduct(bool, TraceCodeBlobStacks, false, \
736 "Trace stack-walk of codeblobs") \
737 \
738 product(bool, PrintJNIResolving, false, \
739 "Used to implement -v:jni") \
740 \
741 notproduct(bool, PrintRewrites, false, \
742 "Print methods that are being rewritten") \
743 \
744 product(bool, UseInlineCaches, true, \
745 "Use Inline Caches for virtual calls ") \
746 \
747 diagnostic(bool, InlineArrayCopy, true, \
748 "Inline arraycopy native that is known to be part of " \
749 "base library DLL") \
750 \
751 diagnostic(bool, InlineObjectHash, true, \
752 "Inline Object::hashCode() native that is known to be part " \
753 "of base library DLL") \
754 \
755 diagnostic(bool, InlineNatives, true, \
756 "Inline natives that are known to be part of base library DLL") \
757 \
758 diagnostic(bool, InlineMathNatives, true, \
759 "Inline SinD, CosD, etc.") \
760 \
761 diagnostic(bool, InlineClassNatives, true, \
762 "Inline Class.isInstance, etc") \
763 \
764 diagnostic(bool, InlineThreadNatives, true, \
765 "Inline Thread.currentThread, etc") \
766 \
767 diagnostic(bool, InlineUnsafeOps, true, \
768 "Inline memory ops (native methods) from Unsafe") \
769 \
770 product(bool, CriticalJNINatives, true, \
771 "Check for critical JNI entry points") \
772 \
773 notproduct(bool, StressCriticalJNINatives, false, \
774 "Exercise register saving code in critical natives") \
775 \
776 diagnostic(bool, UseAESIntrinsics, false, \
777 "Use intrinsics for AES versions of crypto") \
778 \
779 diagnostic(bool, UseAESCTRIntrinsics, false, \
780 "Use intrinsics for the paralleled version of AES/CTR crypto") \
781 \
782 diagnostic(bool, UseSHA1Intrinsics, false, \
783 "Use intrinsics for SHA-1 crypto hash function. " \
784 "Requires that UseSHA is enabled.") \
785 \
786 diagnostic(bool, UseSHA256Intrinsics, false, \
787 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
788 "Requires that UseSHA is enabled.") \
789 \
790 diagnostic(bool, UseSHA512Intrinsics, false, \
791 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
792 "Requires that UseSHA is enabled.") \
793 \
794 diagnostic(bool, UseCRC32Intrinsics, false, \
795 "use intrinsics for java.util.zip.CRC32") \
796 \
797 diagnostic(bool, UseCRC32CIntrinsics, false, \
798 "use intrinsics for java.util.zip.CRC32C") \
799 \
800 diagnostic(bool, UseAdler32Intrinsics, false, \
801 "use intrinsics for java.util.zip.Adler32") \
802 \
803 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
804 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
805 \
806 diagnostic(ccstrlist, DisableIntrinsic, "", \
807 "do not expand intrinsics whose (internal) names appear here") \
808 \
809 develop(bool, TraceCallFixup, false, \
810 "Trace all call fixups") \
811 \
812 develop(bool, DeoptimizeALot, false, \
813 "Deoptimize at every exit from the runtime system") \
814 \
815 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
816 "A comma separated list of bcis to deoptimize at") \
817 \
818 product(bool, DeoptimizeRandom, false, \
819 "Deoptimize random frames on random exit from the runtime system")\
820 \
821 notproduct(bool, ZombieALot, false, \
822 "Create zombies (non-entrant) at exit from the runtime system") \
823 \
824 product(bool, UnlinkSymbolsALot, false, \
825 "Unlink unreferenced symbols from the symbol table at safepoints")\
826 \
827 notproduct(bool, WalkStackALot, false, \
828 "Trace stack (no print) at every exit from the runtime system") \
829 \
830 product(bool, Debugging, false, \
831 "Set when executing debug methods in debug.cpp " \
832 "(to prevent triggering assertions)") \
833 \
834 notproduct(bool, StrictSafepointChecks, trueInDebug, \
835 "Enable strict checks that safepoints cannot happen for threads " \
836 "that use NoSafepointVerifier") \
837 \
838 notproduct(bool, VerifyLastFrame, false, \
839 "Verify oops on last frame on entry to VM") \
840 \
841 product(bool, FailOverToOldVerifier, true, \
842 "Fail over to old verifier when split verifier fails") \
843 \
844 develop(bool, ShowSafepointMsgs, false, \
845 "Show message about safepoint synchronization") \
846 \
847 product(bool, SafepointTimeout, false, \
848 "Time out and warn or fail after SafepointTimeoutDelay " \
849 "milliseconds if failed to reach safepoint") \
850 \
851 develop(bool, DieOnSafepointTimeout, false, \
852 "Die upon failure to reach safepoint (see SafepointTimeout)") \
853 \
854 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
855 /* typically, at most a few retries are needed */ \
856 product(intx, SuspendRetryCount, 50, \
857 "Maximum retry count for an external suspend request") \
858 range(0, max_intx) \
859 \
860 product(intx, SuspendRetryDelay, 5, \
861 "Milliseconds to delay per retry (* current_retry_count)") \
862 range(0, max_intx) \
863 \
864 product(bool, AssertOnSuspendWaitFailure, false, \
865 "Assert/Guarantee on external suspend wait failure") \
866 \
867 product(bool, TraceSuspendWaitFailures, false, \
868 "Trace external suspend wait failures") \
869 \
870 product(bool, MaxFDLimit, true, \
871 "Bump the number of file descriptors to maximum in Solaris") \
872 \
873 diagnostic(bool, LogEvents, true, \
874 "Enable the various ring buffer event logs") \
875 \
876 diagnostic(uintx, LogEventsBufferEntries, 10, \
877 "Number of ring buffer event logs") \
878 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
879 \
880 product(bool, BytecodeVerificationRemote, true, \
881 "Enable the Java bytecode verifier for remote classes") \
882 \
883 product(bool, BytecodeVerificationLocal, false, \
884 "Enable the Java bytecode verifier for local classes") \
885 \
886 develop(bool, ForceFloatExceptions, trueInDebug, \
887 "Force exceptions on FP stack under/overflow") \
888 \
889 develop(bool, VerifyStackAtCalls, false, \
890 "Verify that the stack pointer is unchanged after calls") \
891 \
892 develop(bool, TraceJavaAssertions, false, \
893 "Trace java language assertions") \
894 \
895 notproduct(bool, CheckAssertionStatusDirectives, false, \
896 "Temporary - see javaClasses.cpp") \
897 \
898 notproduct(bool, PrintMallocFree, false, \
899 "Trace calls to C heap malloc/free allocation") \
900 \
901 notproduct(bool, VerifyCodeCache, false, \
902 "Verify code cache on memory allocation/deallocation") \
903 \
904 develop(bool, UseMallocOnly, false, \
905 "Use only malloc/free for allocation (no resource area/arena)") \
906 \
907 develop(bool, PrintMalloc, false, \
908 "Print all malloc/free calls") \
909 \
910 develop(bool, PrintMallocStatistics, false, \
911 "Print malloc/free statistics") \
912 \
913 develop(bool, ZapResourceArea, trueInDebug, \
914 "Zap freed resource/arena space with 0xABABABAB") \
915 \
916 notproduct(bool, ZapVMHandleArea, trueInDebug, \
917 "Zap freed VM handle space with 0xBCBCBCBC") \
918 \
919 develop(bool, ZapJNIHandleArea, trueInDebug, \
920 "Zap freed JNI handle space with 0xFEFEFEFE") \
921 \
922 notproduct(bool, ZapStackSegments, trueInDebug, \
923 "Zap allocated/freed stack segments with 0xFADFADED") \
924 \
925 develop(bool, ZapUnusedHeapArea, trueInDebug, \
926 "Zap unused heap space with 0xBAADBABE") \
927 \
928 develop(bool, CheckZapUnusedHeapArea, false, \
929 "Check zapping of unused heap space") \
930 \
931 develop(bool, ZapFillerObjects, trueInDebug, \
932 "Zap filler objects with 0xDEAFBABE") \
933 \
934 develop(bool, PrintVMMessages, true, \
935 "Print VM messages on console") \
936 \
937 notproduct(uintx, ErrorHandlerTest, 0, \
938 "If > 0, provokes an error after VM initialization; the value " \
939 "determines which error to provoke. See test_error_handler() " \
940 "in vmError.cpp.") \
941 \
942 notproduct(uintx, TestCrashInErrorHandler, 0, \
943 "If > 0, provokes an error inside VM error handler (a secondary " \
944 "crash). see test_error_handler() in vmError.cpp") \
945 \
946 notproduct(bool, TestSafeFetchInErrorHandler, false, \
947 "If true, tests SafeFetch inside error handler.") \
948 \
949 notproduct(bool, TestUnresponsiveErrorHandler, false, \
950 "If true, simulates an unresponsive error handler.") \
951 \
952 develop(bool, Verbose, false, \
953 "Print additional debugging information from other modes") \
954 \
955 develop(bool, PrintMiscellaneous, false, \
956 "Print uncategorized debugging information (requires +Verbose)") \
957 \
958 develop(bool, WizardMode, false, \
959 "Print much more debugging information") \
960 \
961 product(bool, ShowMessageBoxOnError, false, \
962 "Keep process alive on VM fatal error") \
963 \
964 product(bool, CreateCoredumpOnCrash, true, \
965 "Create core/mini dump on VM fatal error") \
966 \
967 product(uint64_t, ErrorLogTimeout, 2 * 60, \
968 "Timeout, in seconds, to limit the time spent on writing an " \
969 "error log in case of a crash.") \
970 range(0, (uint64_t)max_jlong/1000) \
971 \
972 product_pd(bool, UseOSErrorReporting, \
973 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
974 \
975 product(bool, SuppressFatalErrorMessage, false, \
976 "Report NO fatal error message (avoid deadlock)") \
977 \
978 product(ccstrlist, OnError, "", \
979 "Run user-defined commands on fatal error; see VMError.cpp " \
980 "for examples") \
981 \
982 product(ccstrlist, OnOutOfMemoryError, "", \
983 "Run user-defined commands on first java.lang.OutOfMemoryError") \
984 \
985 manageable(bool, HeapDumpBeforeFullGC, false, \
986 "Dump heap to file before any major stop-the-world GC") \
987 \
988 manageable(bool, HeapDumpAfterFullGC, false, \
989 "Dump heap to file after any major stop-the-world GC") \
990 \
991 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
992 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
993 \
994 manageable(ccstr, HeapDumpPath, NULL, \
995 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
996 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
997 "in the working directory)") \
998 \
999 develop(bool, BreakAtWarning, false, \
1000 "Execute breakpoint upon encountering VM warning") \
1001 \
1002 develop(bool, UseFakeTimers, false, \
1003 "Tell whether the VM should use system time or a fake timer") \
1004 \
1005 product(ccstr, NativeMemoryTracking, "off", \
1006 "Native memory tracking options") \
1007 \
1008 diagnostic(bool, PrintNMTStatistics, false, \
1009 "Print native memory tracking summary data if it is on") \
1010 \
1011 diagnostic(bool, LogCompilation, false, \
1012 "Log compilation activity in detail to LogFile") \
1013 \
1014 product(bool, PrintCompilation, false, \
1015 "Print compilations") \
1016 \
1017 diagnostic(bool, TraceNMethodInstalls, false, \
1018 "Trace nmethod installation") \
1019 \
1020 diagnostic(intx, ScavengeRootsInCode, 2, \
1021 "0: do not allow scavengable oops in the code cache; " \
1022 "1: allow scavenging from the code cache; " \
1023 "2: emit as many constants as the compiler can see") \
1024 range(0, 2) \
1025 \
1026 product(bool, AlwaysRestoreFPU, false, \
1027 "Restore the FPU control word after every JNI call (expensive)") \
1028 \
1029 diagnostic(bool, PrintCompilation2, false, \
1030 "Print additional statistics per compilation") \
1031 \
1032 diagnostic(bool, PrintAdapterHandlers, false, \
1033 "Print code generated for i2c/c2i adapters") \
1034 \
1035 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1036 "Verify that i2c/c2i adapters are called properly") \
1037 \
1038 develop(bool, VerifyAdapterSharing, false, \
1039 "Verify that the code for shared adapters is the equivalent") \
1040 \
1041 diagnostic(bool, PrintAssembly, false, \
1042 "Print assembly code (using external disassembler.so)") \
1043 \
1044 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1045 "Print options string passed to disassembler.so") \
1046 \
1047 notproduct(bool, PrintNMethodStatistics, false, \
1048 "Print a summary statistic for the generated nmethods") \
1049 \
1050 diagnostic(bool, PrintNMethods, false, \
1051 "Print assembly code for nmethods when generated") \
1052 \
1053 diagnostic(bool, PrintNativeNMethods, false, \
1054 "Print assembly code for native nmethods when generated") \
1055 \
1056 develop(bool, PrintDebugInfo, false, \
1057 "Print debug information for all nmethods when generated") \
1058 \
1059 develop(bool, PrintRelocations, false, \
1060 "Print relocation information for all nmethods when generated") \
1061 \
1062 develop(bool, PrintDependencies, false, \
1063 "Print dependency information for all nmethods when generated") \
1064 \
1065 develop(bool, PrintExceptionHandlers, false, \
1066 "Print exception handler tables for all nmethods when generated") \
1067 \
1068 develop(bool, StressCompiledExceptionHandlers, false, \
1069 "Exercise compiled exception handlers") \
1070 \
1071 develop(bool, InterceptOSException, false, \
1072 "Start debugger when an implicit OS (e.g. NULL) " \
1073 "exception happens") \
1074 \
1075 product(bool, PrintCodeCache, false, \
1076 "Print the code cache memory usage when exiting") \
1077 \
1078 develop(bool, PrintCodeCache2, false, \
1079 "Print detailed usage information on the code cache when exiting")\
1080 \
1081 product(bool, PrintCodeCacheOnCompilation, false, \
1082 "Print the code cache memory usage each time a method is " \
1083 "compiled") \
1084 \
1085 diagnostic(bool, PrintStubCode, false, \
1086 "Print generated stub code") \
1087 \
1088 product(bool, StackTraceInThrowable, true, \
1089 "Collect backtrace in throwable when exception happens") \
1090 \
1091 product(bool, OmitStackTraceInFastThrow, true, \
1092 "Omit backtraces for some 'hot' exceptions in optimized code") \
1093 \
1094 product(bool, ProfilerPrintByteCodeStatistics, false, \
1095 "Print bytecode statistics when dumping profiler output") \
1096 \
1097 product(bool, ProfilerRecordPC, false, \
1098 "Collect ticks for each 16 byte interval of compiled code") \
1099 \
1100 product(bool, ProfileVM, false, \
1101 "Profile ticks that fall within VM (either in the VM Thread " \
1102 "or VM code called through stubs)") \
1103 \
1104 product(bool, ProfileIntervals, false, \
1105 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1106 \
1107 notproduct(bool, ProfilerCheckIntervals, false, \
1108 "Collect and print information on spacing of profiler ticks") \
1109 \
1110 product(bool, PrintWarnings, true, \
1111 "Print JVM warnings to output stream") \
1112 \
1113 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1114 "Print warnings for stalled SpinLocks") \
1115 \
1116 product(bool, RegisterFinalizersAtInit, true, \
1117 "Register finalizable objects at end of Object.<init> or " \
1118 "after allocation") \
1119 \
1120 develop(bool, RegisterReferences, true, \
1121 "Tell whether the VM should register soft/weak/final/phantom " \
1122 "references") \
1123 \
1124 develop(bool, IgnoreRewrites, false, \
1125 "Suppress rewrites of bytecodes in the oopmap generator. " \
1126 "This is unsafe!") \
1127 \
1128 develop(bool, PrintCodeCacheExtension, false, \
1129 "Print extension of code cache") \
1130 \
1131 develop(bool, UsePrivilegedStack, true, \
1132 "Enable the security JVM functions") \
1133 \
1134 develop(bool, ProtectionDomainVerification, true, \
1135 "Verify protection domain before resolution in system dictionary")\
1136 \
1137 product(bool, ClassUnloading, true, \
1138 "Do unloading of classes") \
1139 \
1140 product(bool, ClassUnloadingWithConcurrentMark, true, \
1141 "Do unloading of classes with a concurrent marking cycle") \
1142 \
1143 develop(bool, DisableStartThread, false, \
1144 "Disable starting of additional Java threads " \
1145 "(for debugging only)") \
1146 \
1147 develop(bool, MemProfiling, false, \
1148 "Write memory usage profiling to log file") \
1149 \
1150 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1151 "Print the system dictionary at exit") \
1152 \
1153 experimental(intx, PredictedLoadedClassCount, 0, \
1154 "Experimental: Tune loaded class cache starting size") \
1155 \
1156 diagnostic(bool, UnsyncloadClass, false, \
1157 "Unstable: VM calls loadClass unsynchronized. Custom " \
1158 "class loader must call VM synchronized for findClass " \
1159 "and defineClass.") \
1160 \
1161 product(bool, AlwaysLockClassLoader, false, \
1162 "Require the VM to acquire the class loader lock before calling " \
1163 "loadClass() even for class loaders registering " \
1164 "as parallel capable") \
1165 \
1166 product(bool, AllowParallelDefineClass, false, \
1167 "Allow parallel defineClass requests for class loaders " \
1168 "registering as parallel capable") \
1169 \
1170 product(bool, MustCallLoadClassInternal, false, \
1171 "Call loadClassInternal() rather than loadClass()") \
1172 \
1173 product_pd(bool, DontYieldALot, \
1174 "Throw away obvious excess yield calls") \
1175 \
1176 develop(bool, UseDetachedThreads, true, \
1177 "Use detached threads that are recycled upon termination " \
1178 "(for Solaris only)") \
1179 \
1180 product(bool, UseLWPSynchronization, true, \
1181 "Use LWP-based instead of libthread-based synchronization " \
1182 "(SPARC only)") \
1183 \
1184 experimental(ccstr, SyncKnobs, NULL, \
1185 "(Unstable) Various monitor synchronization tunables") \
1186 \
1187 experimental(intx, EmitSync, 0, \
1188 "(Unsafe, Unstable) " \
1189 "Control emission of inline sync fast-path code") \
1190 \
1191 product(intx, MonitorBound, 0, "Bound Monitor population") \
1192 range(0, max_jint) \
1193 \
1194 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \
1195 \
1196 experimental(intx, MonitorUsedDeflationThreshold, 90, \
1197 "Percentage of used monitors before triggering cleanup " \
1198 "safepoint which deflates monitors (0 is off). " \
1199 "The check is performed on GuaranteedSafepointInterval.") \
1200 range(0, 100) \
1201 \
1202 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1203 "Experimental Sync flags") \
1204 \
1205 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1206 \
1207 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1208 \
1209 experimental(intx, hashCode, 5, \
1210 "(Unstable) select hashCode generation algorithm") \
1211 \
1212 product(bool, FilterSpuriousWakeups, true, \
1213 "When true prevents OS-level spurious, or premature, wakeups " \
1214 "from Object.wait (Ignored for Windows)") \
1215 \
1216 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1217 \
1218 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1219 \
1220 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1221 \
1222 develop(bool, UsePthreads, false, \
1223 "Use pthread-based instead of libthread-based synchronization " \
1224 "(SPARC only)") \
1225 \
1226 product(bool, ReduceSignalUsage, false, \
1227 "Reduce the use of OS signals in Java and/or the VM") \
1228 \
1229 develop_pd(bool, ShareVtableStubs, \
1230 "Share vtable stubs (smaller code but worse branch prediction") \
1231 \
1232 develop(bool, LoadLineNumberTables, true, \
1233 "Tell whether the class file parser loads line number tables") \
1234 \
1235 develop(bool, LoadLocalVariableTables, true, \
1236 "Tell whether the class file parser loads local variable tables") \
1237 \
1238 develop(bool, LoadLocalVariableTypeTables, true, \
1239 "Tell whether the class file parser loads local variable type" \
1240 "tables") \
1241 \
1242 product(bool, AllowUserSignalHandlers, false, \
1243 "Do not complain if the application installs signal handlers " \
1244 "(Solaris & Linux only)") \
1245 \
1246 product(bool, UseSignalChaining, true, \
1247 "Use signal-chaining to invoke signal handlers installed " \
1248 "by the application (Solaris & Linux only)") \
1249 \
1250 product(bool, AllowJNIEnvProxy, false, \
1251 "Allow JNIEnv proxies for jdbx") \
1252 \
1253 product(bool, RestoreMXCSROnJNICalls, false, \
1254 "Restore MXCSR when returning from JNI calls") \
1255 \
1256 product(bool, CheckJNICalls, false, \
1257 "Verify all arguments to JNI calls") \
1258 \
1259 product(bool, CheckEndorsedAndExtDirs, false, \
1260 "Verify the endorsed and extension directories are not used") \
1261 \
1262 product(bool, UseFastJNIAccessors, true, \
1263 "Use optimized versions of Get<Primitive>Field") \
1264 \
1265 product(intx, MaxJNILocalCapacity, 65536, \
1266 "Maximum allowable local JNI handle capacity to " \
1267 "EnsureLocalCapacity() and PushLocalFrame(), " \
1268 "where <= 0 is unlimited, default: 65536") \
1269 range(min_intx, max_intx) \
1270 \
1271 product(bool, EagerXrunInit, false, \
1272 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1273 "but not all -Xrun libraries may support the state of the VM " \
1274 "at this time") \
1275 \
1276 product(bool, PreserveAllAnnotations, false, \
1277 "Preserve RuntimeInvisibleAnnotations as well " \
1278 "as RuntimeVisibleAnnotations") \
1279 \
1280 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1281 "Number of OutOfMemoryErrors preallocated with backtrace") \
1282 \
1283 product(bool, UseXMMForArrayCopy, false, \
1284 "Use SSE2 MOVQ instruction for Arraycopy") \
1285 \
1286 product(intx, FieldsAllocationStyle, 1, \
1287 "0 - type based with oops first, " \
1288 "1 - with oops last, " \
1289 "2 - oops in super and sub classes are together") \
1290 range(0, 2) \
1291 \
1292 product(bool, CompactFields, true, \
1293 "Allocate nonstatic fields in gaps between previous fields") \
1294 \
1295 notproduct(bool, PrintFieldLayout, false, \
1296 "Print field layout for each class") \
1297 \
1298 notproduct(bool, PrintValueLayout, false, \
1299 "Print field layout for each value type") \
1300 \
1301 notproduct(bool, PrintValueArrayLayout, false, \
1302 "Print array layout for each value type array") \
1303 \
1304 product(bool, ValueArrayFlatten, true, \
1305 "Flatten value array elements, if possible") \
1306 \
1307 product(intx, ValueArrayElemMaxFlatSize, -1, \
1308 "Max size for flattening value array elements, <0 no limit") \
1309 \
1310 product(intx, ValueFieldMaxFlatSize, -1, \
1311 "Max size for flattening value type fields, <0 no limit") \
1312 \
1313 product(intx, ValueArrayElemMaxFlatOops, 4, \
1314 "Max nof embedded object references in a value type to flatten, <0 no limit") \
1315 \
1316 product(bool, ValueArrayAtomicAccess, false, \
1317 "Atomic value array accesses by-default, for all value arrays") \
1318 \
1319 /* Need to limit the extent of the padding to reasonable size. */\
1320 /* 8K is well beyond the reasonable HW cache line size, even with */\
1321 /* aggressive prefetching, while still leaving the room for segregating */\
1322 /* among the distinct pages. */\
1323 product(intx, ContendedPaddingWidth, 128, \
1324 "How many bytes to pad the fields/classes marked @Contended with")\
1325 range(0, 8192) \
1326 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1327 \
1328 product(bool, EnableContended, true, \
1329 "Enable @Contended annotation support") \
1330 \
1331 product(bool, RestrictContended, true, \
1332 "Restrict @Contended to trusted classes") \
1333 \
1334 product(bool, UseBiasedLocking, true, \
1335 "Enable biased locking in JVM") \
1336 \
1337 product(intx, BiasedLockingStartupDelay, 0, \
1338 "Number of milliseconds to wait before enabling biased locking") \
1339 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1340 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1341 \
1342 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1343 "Print statistics of biased locking in JVM") \
1344 \
1345 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1346 "Threshold of number of revocations per type to try to " \
1347 "rebias all objects in the heap of that type") \
1348 range(0, max_intx) \
1349 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1350 \
1351 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1352 "Threshold of number of revocations per type to permanently " \
1353 "revoke biases of all objects in the heap of that type") \
1354 range(0, max_intx) \
1355 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1356 \
1357 product(intx, BiasedLockingDecayTime, 25000, \
1358 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1359 "type after previous bulk rebias") \
1360 range(500, max_intx) \
1361 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1362 \
1363 product(bool, ExitOnOutOfMemoryError, false, \
1364 "JVM exits on the first occurrence of an out-of-memory error") \
1365 \
1366 product(bool, CrashOnOutOfMemoryError, false, \
1367 "JVM aborts, producing an error log and core/mini dump, on the " \
1368 "first occurrence of an out-of-memory error") \
1369 \
1370 /* tracing */ \
1371 \
1372 develop(bool, StressRewriter, false, \
1373 "Stress linktime bytecode rewriting") \
1374 \
1375 product(ccstr, TraceJVMTI, NULL, \
1376 "Trace flags for JVMTI functions and events") \
1377 \
1378 /* This option can change an EMCP method into an obsolete method. */ \
1379 /* This can affect tests that except specific methods to be EMCP. */ \
1380 /* This option should be used with caution. */ \
1381 product(bool, StressLdcRewrite, false, \
1382 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1383 \
1384 /* change to false by default sometime after Mustang */ \
1385 product(bool, VerifyMergedCPBytecodes, true, \
1386 "Verify bytecodes after RedefineClasses constant pool merging") \
1387 \
1388 develop(bool, TraceBytecodes, false, \
1389 "Trace bytecode execution") \
1390 \
1391 develop(bool, TraceICs, false, \
1392 "Trace inline cache changes") \
1393 \
1394 notproduct(bool, TraceInvocationCounterOverflow, false, \
1395 "Trace method invocation counter overflow") \
1396 \
1397 develop(bool, TraceInlineCacheClearing, false, \
1398 "Trace clearing of inline caches in nmethods") \
1399 \
1400 develop(bool, TraceDependencies, false, \
1401 "Trace dependencies") \
1402 \
1403 develop(bool, VerifyDependencies, trueInDebug, \
1404 "Exercise and verify the compilation dependency mechanism") \
1405 \
1406 develop(bool, TraceNewOopMapGeneration, false, \
1407 "Trace OopMapGeneration") \
1408 \
1409 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1410 "Trace OopMapGeneration: print detailed cell states") \
1411 \
1412 develop(bool, TimeOopMap, false, \
1413 "Time calls to GenerateOopMap::compute_map() in sum") \
1414 \
1415 develop(bool, TimeOopMap2, false, \
1416 "Time calls to GenerateOopMap::compute_map() individually") \
1417 \
1418 develop(bool, TraceOopMapRewrites, false, \
1419 "Trace rewriting of method oops during oop map generation") \
1420 \
1421 develop(bool, TraceICBuffer, false, \
1422 "Trace usage of IC buffer") \
1423 \
1424 develop(bool, TraceCompiledIC, false, \
1425 "Trace changes of compiled IC") \
1426 \
1427 /* gc */ \
1428 \
1429 product(bool, UseSerialGC, false, \
1430 "Use the Serial garbage collector") \
1431 \
1432 product(bool, UseG1GC, false, \
1433 "Use the Garbage-First garbage collector") \
1434 \
1435 product(bool, UseParallelGC, false, \
1436 "Use the Parallel Scavenge garbage collector") \
1437 \
1438 product(bool, UseParallelOldGC, false, \
1439 "Use the Parallel Old garbage collector") \
1440 \
1441 product(uintx, HeapMaximumCompactionInterval, 20, \
1442 "How often should we maximally compact the heap (not allowing " \
1443 "any dead space)") \
1444 range(0, max_uintx) \
1445 \
1446 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1447 "The collection count for the first maximum compaction") \
1448 range(0, max_uintx) \
1449 \
1450 product(bool, UseMaximumCompactionOnSystemGC, true, \
1451 "Use maximum compaction in the Parallel Old garbage collector " \
1452 "for a system GC") \
1453 \
1454 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1455 "The mean used by the parallel compact dead wood " \
1456 "limiter (a number between 0-100)") \
1457 range(0, 100) \
1458 \
1459 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1460 "The standard deviation used by the parallel compact dead wood " \
1461 "limiter (a number between 0-100)") \
1462 range(0, 100) \
1463 \
1464 product(uint, ParallelGCThreads, 0, \
1465 "Number of parallel threads parallel gc will use") \
1466 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1467 \
1468 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1469 "Use semaphore synchronization for the GC Threads, " \
1470 "instead of synchronization based on mutexes") \
1471 \
1472 product(bool, UseDynamicNumberOfGCThreads, false, \
1473 "Dynamically choose the number of parallel threads " \
1474 "parallel gc will use") \
1475 \
1476 diagnostic(bool, InjectGCWorkerCreationFailure, false, \
1477 "Inject thread creation failures for " \
1478 "UseDynamicNumberOfGCThreads") \
1479 \
1480 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1481 "Force dynamic selection of the number of " \
1482 "parallel threads parallel gc will use to aid debugging") \
1483 \
1484 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1485 "Size of heap (bytes) per GC thread used in calculating the " \
1486 "number of GC threads") \
1487 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1488 \
1489 product(uint, ConcGCThreads, 0, \
1490 "Number of threads concurrent gc will use") \
1491 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1492 \
1493 product(uint, GCTaskTimeStampEntries, 200, \
1494 "Number of time stamp entries per gc worker thread") \
1495 range(1, max_jint) \
1496 \
1497 product(bool, AlwaysTenure, false, \
1498 "Always tenure objects in eden (ParallelGC only)") \
1499 \
1500 product(bool, NeverTenure, false, \
1501 "Never tenure objects in eden, may tenure on overflow " \
1502 "(ParallelGC only)") \
1503 \
1504 product(bool, ScavengeBeforeFullGC, true, \
1505 "Scavenge youngest generation before each full GC.") \
1506 \
1507 product(bool, UseConcMarkSweepGC, false, \
1508 "Use Concurrent Mark-Sweep GC in the old generation") \
1509 \
1510 product(bool, ExplicitGCInvokesConcurrent, false, \
1511 "A System.gc() request invokes a concurrent collection; " \
1512 "(effective only when using concurrent collectors)") \
1513 \
1514 product(bool, GCLockerInvokesConcurrent, false, \
1515 "The exit of a JNI critical section necessitating a scavenge, " \
1516 "also kicks off a background concurrent collection") \
1517 \
1518 product(uintx, GCLockerEdenExpansionPercent, 5, \
1519 "How much the GC can expand the eden by while the GC locker " \
1520 "is active (as a percentage)") \
1521 range(0, 100) \
1522 \
1523 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1524 "Number of times to retry allocations when " \
1525 "blocked by the GC locker") \
1526 range(0, max_uintx) \
1527 \
1528 product(bool, UseCMSBestFit, true, \
1529 "Use CMS best fit allocation strategy") \
1530 \
1531 product(uintx, ParallelGCBufferWastePct, 10, \
1532 "Wasted fraction of parallel allocation buffer") \
1533 range(0, 100) \
1534 \
1535 product(uintx, TargetPLABWastePct, 10, \
1536 "Target wasted space in last buffer as percent of overall " \
1537 "allocation") \
1538 range(1, 100) \
1539 \
1540 product(uintx, PLABWeight, 75, \
1541 "Percentage (0-100) used to weight the current sample when " \
1542 "computing exponentially decaying average for ResizePLAB") \
1543 range(0, 100) \
1544 \
1545 product(bool, ResizePLAB, true, \
1546 "Dynamically resize (survivor space) promotion LAB's") \
1547 \
1548 product(int, ParGCArrayScanChunk, 50, \
1549 "Scan a subset of object array and push remainder, if array is " \
1550 "bigger than this") \
1551 range(1, max_jint/3) \
1552 \
1553 product(bool, ParGCUseLocalOverflow, false, \
1554 "Instead of a global overflow list, use local overflow stacks") \
1555 \
1556 product(bool, ParGCTrimOverflow, true, \
1557 "Eagerly trim the local overflow lists " \
1558 "(when ParGCUseLocalOverflow)") \
1559 \
1560 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1561 "Simulate work queue overflow in ParNew") \
1562 \
1563 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1564 "An `interval' counter that determines how frequently " \
1565 "we simulate overflow; a smaller number increases frequency") \
1566 \
1567 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1568 "The desired number of objects to claim from the overflow list") \
1569 range(0, max_uintx) \
1570 \
1571 diagnostic(uintx, ParGCStridesPerThread, 2, \
1572 "The number of strides per worker thread that we divide up the " \
1573 "card table scanning work into") \
1574 range(1, max_uintx) \
1575 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1576 \
1577 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1578 "The number of cards in each chunk of the parallel chunks used " \
1579 "during card table scanning") \
1580 range(1, max_intx) \
1581 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1582 \
1583 product(uintx, OldPLABWeight, 50, \
1584 "Percentage (0-100) used to weight the current sample when " \
1585 "computing exponentially decaying average for resizing " \
1586 "OldPLABSize") \
1587 range(0, 100) \
1588 \
1589 product(bool, ResizeOldPLAB, true, \
1590 "Dynamically resize (old gen) promotion LAB's") \
1591 \
1592 product(size_t, CMSOldPLABMax, 1024, \
1593 "Maximum size of CMS gen promotion LAB caches per worker " \
1594 "per block size") \
1595 range(1, max_uintx) \
1596 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1597 \
1598 product(size_t, CMSOldPLABMin, 16, \
1599 "Minimum size of CMS gen promotion LAB caches per worker " \
1600 "per block size") \
1601 range(1, max_uintx) \
1602 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1603 \
1604 product(uintx, CMSOldPLABNumRefills, 4, \
1605 "Nominal number of refills of CMS gen promotion LAB cache " \
1606 "per worker per block size") \
1607 range(1, max_uintx) \
1608 \
1609 product(bool, CMSOldPLABResizeQuicker, false, \
1610 "React on-the-fly during a scavenge to a sudden " \
1611 "change in block demand rate") \
1612 \
1613 product(uintx, CMSOldPLABToleranceFactor, 4, \
1614 "The tolerance of the phase-change detector for on-the-fly " \
1615 "PLAB resizing during a scavenge") \
1616 range(1, max_uintx) \
1617 \
1618 product(uintx, CMSOldPLABReactivityFactor, 2, \
1619 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1620 "during a scavenge") \
1621 range(1, max_uintx) \
1622 \
1623 product(bool, AlwaysPreTouch, false, \
1624 "Force all freshly committed pages to be pre-touched") \
1625 \
1626 product(size_t, PreTouchParallelChunkSize, 1 * G, \
1627 "Per-thread chunk size for parallel memory pre-touch.") \
1628 range(1, SIZE_MAX / 2) \
1629 \
1630 product_pd(size_t, CMSYoungGenPerWorker, \
1631 "The maximum size of young gen chosen by default per GC worker " \
1632 "thread available") \
1633 range(1, max_uintx) \
1634 \
1635 product(uintx, CMSIncrementalSafetyFactor, 10, \
1636 "Percentage (0-100) used to add conservatism when computing the " \
1637 "duty cycle") \
1638 range(0, 100) \
1639 \
1640 product(uintx, CMSExpAvgFactor, 50, \
1641 "Percentage (0-100) used to weight the current sample when " \
1642 "computing exponential averages for CMS statistics") \
1643 range(0, 100) \
1644 \
1645 product(uintx, CMS_FLSWeight, 75, \
1646 "Percentage (0-100) used to weight the current sample when " \
1647 "computing exponentially decaying averages for CMS FLS " \
1648 "statistics") \
1649 range(0, 100) \
1650 \
1651 product(uintx, CMS_FLSPadding, 1, \
1652 "The multiple of deviation from mean to use for buffering " \
1653 "against volatility in free list demand") \
1654 range(0, max_juint) \
1655 \
1656 product(uintx, FLSCoalescePolicy, 2, \
1657 "CMS: aggressiveness level for coalescing, increasing " \
1658 "from 0 to 4") \
1659 range(0, 4) \
1660 \
1661 product(bool, FLSAlwaysCoalesceLarge, false, \
1662 "CMS: larger free blocks are always available for coalescing") \
1663 \
1664 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1665 "CMS: the smaller the percentage the greater the coalescing " \
1666 "force") \
1667 range(0.0, 1.0) \
1668 \
1669 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1670 "CMS: the factor by which to inflate estimated demand of small " \
1671 "block sizes to prevent coalescing with an adjoining block") \
1672 range(0.0, DBL_MAX) \
1673 \
1674 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1675 "CMS: the factor by which to inflate estimated demand of large " \
1676 "block sizes to prevent coalescing with an adjoining block") \
1677 range(0.0, DBL_MAX) \
1678 \
1679 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1680 "CMS: the factor by which to inflate estimated demand of small " \
1681 "block sizes to prevent splitting to supply demand for smaller " \
1682 "blocks") \
1683 range(0.0, DBL_MAX) \
1684 \
1685 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1686 "CMS: the factor by which to inflate estimated demand of large " \
1687 "block sizes to prevent splitting to supply demand for smaller " \
1688 "blocks") \
1689 range(0.0, DBL_MAX) \
1690 \
1691 product(bool, CMSExtrapolateSweep, false, \
1692 "CMS: cushion for block demand during sweep") \
1693 \
1694 product(uintx, CMS_SweepWeight, 75, \
1695 "Percentage (0-100) used to weight the current sample when " \
1696 "computing exponentially decaying average for inter-sweep " \
1697 "duration") \
1698 range(0, 100) \
1699 \
1700 product(uintx, CMS_SweepPadding, 1, \
1701 "The multiple of deviation from mean to use for buffering " \
1702 "against volatility in inter-sweep duration") \
1703 range(0, max_juint) \
1704 \
1705 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1706 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1707 "duration exceeds this threshold in milliseconds") \
1708 range(0, max_uintx) \
1709 \
1710 product(bool, CMSClassUnloadingEnabled, true, \
1711 "Whether class unloading enabled when using CMS GC") \
1712 \
1713 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1714 "When CMS class unloading is enabled, the maximum CMS cycle " \
1715 "count for which classes may not be unloaded") \
1716 range(0, max_uintx) \
1717 \
1718 product(uintx, CMSIndexedFreeListReplenish, 4, \
1719 "Replenish an indexed free list with this number of chunks") \
1720 range(1, max_uintx) \
1721 \
1722 product(bool, CMSReplenishIntermediate, true, \
1723 "Replenish all intermediate free-list caches") \
1724 \
1725 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1726 "When satisfying batched demand, split blocks from the " \
1727 "IndexedFreeList whose size is a multiple of requested size") \
1728 \
1729 product(bool, CMSLoopWarn, false, \
1730 "Warn in case of excessive CMS looping") \
1731 \
1732 /* where does the range max value of (max_jint - 1) come from? */ \
1733 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1734 "Maximum size of marking stack") \
1735 range(1, (max_jint - 1)) \
1736 \
1737 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1738 "Size of marking stack") \
1739 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1740 \
1741 notproduct(bool, CMSMarkStackOverflowALot, false, \
1742 "Simulate frequent marking stack / work queue overflow") \
1743 \
1744 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1745 "An \"interval\" counter that determines how frequently " \
1746 "to simulate overflow; a smaller number increases frequency") \
1747 \
1748 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1749 "Maximum number of abortable preclean iterations, if > 0") \
1750 range(0, max_uintx) \
1751 \
1752 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1753 "Maximum time in abortable preclean (in milliseconds)") \
1754 range(0, max_intx) \
1755 \
1756 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1757 "Nominal minimum work per abortable preclean iteration") \
1758 range(0, max_uintx) \
1759 \
1760 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1761 "Time that we sleep between iterations when not given " \
1762 "enough work per iteration") \
1763 range(0, max_intx) \
1764 \
1765 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \
1766 product(size_t, CMSRescanMultiple, 32, \
1767 "Size (in cards) of CMS parallel rescan task") \
1768 range(1, SIZE_MAX / 4096) \
1769 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \
1770 \
1771 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \
1772 product(size_t, CMSConcMarkMultiple, 32, \
1773 "Size (in cards) of CMS concurrent MT marking task") \
1774 range(1, SIZE_MAX / 4096) \
1775 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \
1776 \
1777 product(bool, CMSAbortSemantics, false, \
1778 "Whether abort-on-overflow semantics is implemented") \
1779 \
1780 product(bool, CMSParallelInitialMarkEnabled, true, \
1781 "Use the parallel initial mark.") \
1782 \
1783 product(bool, CMSParallelRemarkEnabled, true, \
1784 "Whether parallel remark enabled (only if ParNewGC)") \
1785 \
1786 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1787 "Whether parallel remark of survivor space " \
1788 "enabled (effective only if CMSParallelRemarkEnabled)") \
1789 \
1790 product(bool, CMSPLABRecordAlways, true, \
1791 "Always record survivor space PLAB boundaries (effective only " \
1792 "if CMSParallelSurvivorRemarkEnabled)") \
1793 \
1794 product(bool, CMSEdenChunksRecordAlways, true, \
1795 "Always record eden chunks used for the parallel initial mark " \
1796 "or remark of eden") \
1797 \
1798 product(bool, CMSConcurrentMTEnabled, true, \
1799 "Whether multi-threaded concurrent work enabled " \
1800 "(effective only if ParNewGC)") \
1801 \
1802 product(bool, CMSPrecleaningEnabled, true, \
1803 "Whether concurrent precleaning enabled") \
1804 \
1805 product(uintx, CMSPrecleanIter, 3, \
1806 "Maximum number of precleaning iteration passes") \
1807 range(0, 9) \
1808 \
1809 product(uintx, CMSPrecleanDenominator, 3, \
1810 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1811 "ratio") \
1812 range(1, max_uintx) \
1813 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1814 \
1815 product(uintx, CMSPrecleanNumerator, 2, \
1816 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1817 "ratio") \
1818 range(0, max_uintx-1) \
1819 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1820 \
1821 product(bool, CMSPrecleanRefLists1, true, \
1822 "Preclean ref lists during (initial) preclean phase") \
1823 \
1824 product(bool, CMSPrecleanRefLists2, false, \
1825 "Preclean ref lists during abortable preclean phase") \
1826 \
1827 product(bool, CMSPrecleanSurvivors1, false, \
1828 "Preclean survivors during (initial) preclean phase") \
1829 \
1830 product(bool, CMSPrecleanSurvivors2, true, \
1831 "Preclean survivors during abortable preclean phase") \
1832 \
1833 product(uintx, CMSPrecleanThreshold, 1000, \
1834 "Do not iterate again if number of dirty cards is less than this")\
1835 range(100, max_uintx) \
1836 \
1837 product(bool, CMSCleanOnEnter, true, \
1838 "Clean-on-enter optimization for reducing number of dirty cards") \
1839 \
1840 product(uintx, CMSRemarkVerifyVariant, 1, \
1841 "Choose variant (1,2) of verification following remark") \
1842 range(1, 2) \
1843 \
1844 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1845 "If Eden size is below this, do not try to schedule remark") \
1846 range(0, max_uintx) \
1847 \
1848 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1849 "The Eden occupancy percentage (0-100) at which " \
1850 "to try and schedule remark pause") \
1851 range(0, 100) \
1852 \
1853 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1854 "Start sampling eden top at least before young gen " \
1855 "occupancy reaches 1/<ratio> of the size at which " \
1856 "we plan to schedule remark") \
1857 range(1, max_uintx) \
1858 \
1859 product(uintx, CMSSamplingGrain, 16*K, \
1860 "The minimum distance between eden samples for CMS (see above)") \
1861 range(ObjectAlignmentInBytes, max_uintx) \
1862 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \
1863 \
1864 product(bool, CMSScavengeBeforeRemark, false, \
1865 "Attempt scavenge before the CMS remark step") \
1866 \
1867 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1868 "Don't drain below this size per parallel worker/thief") \
1869 range(1, max_juint) \
1870 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1871 \
1872 manageable(intx, CMSWaitDuration, 2000, \
1873 "Time in milliseconds that CMS thread waits for young GC") \
1874 range(min_jint, max_jint) \
1875 \
1876 develop(uintx, CMSCheckInterval, 1000, \
1877 "Interval in milliseconds that CMS thread checks if it " \
1878 "should start a collection cycle") \
1879 \
1880 product(bool, CMSYield, true, \
1881 "Yield between steps of CMS") \
1882 \
1883 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1884 "Bitmap operations should process at most this many bits " \
1885 "between yields") \
1886 range(1, max_uintx) \
1887 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \
1888 \
1889 product(bool, CMSPrintChunksInDump, false, \
1890 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1891 "trace level include more detailed information about the" \
1892 "free chunks") \
1893 \
1894 product(bool, CMSPrintObjectsInDump, false, \
1895 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1896 "trace level include more detailed information about the" \
1897 "allocated objects") \
1898 \
1899 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1900 "Verify that all references across the FLS boundary " \
1901 "are to valid objects") \
1902 \
1903 diagnostic(bool, FLSVerifyLists, false, \
1904 "Do lots of (expensive) FreeListSpace verification") \
1905 \
1906 diagnostic(bool, FLSVerifyIndexTable, false, \
1907 "Do lots of (expensive) FLS index table verification") \
1908 \
1909 develop(bool, FLSVerifyDictionary, false, \
1910 "Do lots of (expensive) FLS dictionary verification") \
1911 \
1912 develop(bool, VerifyBlockOffsetArray, false, \
1913 "Do (expensive) block offset array verification") \
1914 \
1915 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1916 "Maintain _unallocated_block in BlockOffsetArray " \
1917 "(currently applicable only to CMS collector)") \
1918 \
1919 product(intx, RefDiscoveryPolicy, 0, \
1920 "Select type of reference discovery policy: " \
1921 "reference-based(0) or referent-based(1)") \
1922 range(ReferenceProcessor::DiscoveryPolicyMin, \
1923 ReferenceProcessor::DiscoveryPolicyMax) \
1924 \
1925 product(bool, ParallelRefProcEnabled, false, \
1926 "Enable parallel reference processing whenever possible") \
1927 \
1928 product(bool, ParallelRefProcBalancingEnabled, true, \
1929 "Enable balancing of reference processing queues") \
1930 \
1931 product(uintx, CMSTriggerRatio, 80, \
1932 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1933 "allocated before a CMS collection cycle commences") \
1934 range(0, 100) \
1935 \
1936 product(uintx, CMSBootstrapOccupancy, 50, \
1937 "Percentage CMS generation occupancy at which to " \
1938 "initiate CMS collection for bootstrapping collection stats") \
1939 range(0, 100) \
1940 \
1941 product(intx, CMSInitiatingOccupancyFraction, -1, \
1942 "Percentage CMS generation occupancy to start a CMS collection " \
1943 "cycle. A negative value means that CMSTriggerRatio is used") \
1944 range(min_intx, 100) \
1945 \
1946 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1947 "The percent occupancy (IHOP) of the current old generation " \
1948 "capacity above which a concurrent mark cycle will be initiated " \
1949 "Its value may change over time if adaptive IHOP is enabled, " \
1950 "otherwise the value remains constant. " \
1951 "In the latter case a value of 0 will result as frequent as " \
1952 "possible concurrent marking cycles. A value of 100 disables " \
1953 "concurrent marking. " \
1954 "Fragmentation waste in the old generation is not considered " \
1955 "free space in this calculation. (G1 collector only)") \
1956 range(0, 100) \
1957 \
1958 manageable(intx, CMSTriggerInterval, -1, \
1959 "Commence a CMS collection cycle (at least) every so many " \
1960 "milliseconds (0 permanently, -1 disabled)") \
1961 range(-1, max_intx) \
1962 \
1963 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1964 "Only use occupancy as a criterion for starting a CMS collection")\
1965 \
1966 product(uintx, CMSIsTooFullPercentage, 98, \
1967 "An absolute ceiling above which CMS will always consider the " \
1968 "unloading of classes when class unloading is enabled") \
1969 range(0, 100) \
1970 \
1971 develop(bool, CMSTestInFreeList, false, \
1972 "Check if the coalesced range is already in the " \
1973 "free lists as claimed") \
1974 \
1975 notproduct(bool, CMSVerifyReturnedBytes, false, \
1976 "Check that all the garbage collected was returned to the " \
1977 "free lists") \
1978 \
1979 notproduct(bool, ScavengeALot, false, \
1980 "Force scavenge at every Nth exit from the runtime system " \
1981 "(N=ScavengeALotInterval)") \
1982 \
1983 develop(bool, FullGCALot, false, \
1984 "Force full gc at every Nth exit from the runtime system " \
1985 "(N=FullGCALotInterval)") \
1986 \
1987 notproduct(bool, GCALotAtAllSafepoints, false, \
1988 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1989 \
1990 notproduct(bool, PromotionFailureALot, false, \
1991 "Use promotion failure handling on every youngest generation " \
1992 "collection") \
1993 \
1994 develop(uintx, PromotionFailureALotCount, 1000, \
1995 "Number of promotion failures occurring at PLAB " \
1996 "refill attempts (ParNew) or promotion attempts " \
1997 "(other young collectors)") \
1998 \
1999 develop(uintx, PromotionFailureALotInterval, 5, \
2000 "Total collections between promotion failures a lot") \
2001 \
2002 experimental(uintx, WorkStealingSleepMillis, 1, \
2003 "Sleep time when sleep is used for yields") \
2004 \
2005 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2006 "Number of yields before a sleep is done during work stealing") \
2007 \
2008 experimental(uintx, WorkStealingHardSpins, 4096, \
2009 "Number of iterations in a spin loop between checks on " \
2010 "time out of hard spin") \
2011 \
2012 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2013 "Ratio of hard spins to calls to yield") \
2014 \
2015 develop(uintx, ObjArrayMarkingStride, 2048, \
2016 "Number of object array elements to push onto the marking stack " \
2017 "before pushing a continuation entry") \
2018 \
2019 develop(bool, MetadataAllocationFailALot, false, \
2020 "Fail metadata allocations at intervals controlled by " \
2021 "MetadataAllocationFailALotInterval") \
2022 \
2023 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2024 "Metadata allocation failure a lot interval") \
2025 \
2026 notproduct(bool, ExecuteInternalVMTests, false, \
2027 "Enable execution of internal VM tests") \
2028 \
2029 notproduct(bool, VerboseInternalVMTests, false, \
2030 "Turn on logging for internal VM tests.") \
2031 \
2032 product(bool, ExecutingUnitTests, false, \
2033 "Whether the JVM is running unit tests or not") \
2034 \
2035 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2036 \
2037 product_pd(bool, ResizeTLAB, \
2038 "Dynamically resize TLAB size for threads") \
2039 \
2040 product(bool, ZeroTLAB, false, \
2041 "Zero out the newly created TLAB") \
2042 \
2043 product(bool, FastTLABRefill, true, \
2044 "Use fast TLAB refill code") \
2045 \
2046 product(bool, TLABStats, true, \
2047 "Provide more detailed and expensive TLAB statistics.") \
2048 \
2049 product_pd(bool, NeverActAsServerClassMachine, \
2050 "Never act like a server-class machine") \
2051 \
2052 product(bool, AlwaysActAsServerClassMachine, false, \
2053 "Always act like a server-class machine") \
2054 \
2055 product_pd(uint64_t, MaxRAM, \
2056 "Real memory size (in bytes) used to set maximum heap size") \
2057 range(0, 0XFFFFFFFFFFFFFFFF) \
2058 \
2059 product(size_t, ErgoHeapSizeLimit, 0, \
2060 "Maximum ergonomically set heap size (in bytes); zero means use " \
2061 "MaxRAM * MaxRAMPercentage / 100") \
2062 range(0, max_uintx) \
2063 \
2064 experimental(bool, UseCGroupMemoryLimitForHeap, false, \
2065 "Use CGroup memory limit as physical memory limit for heap " \
2066 "sizing") \
2067 \
2068 product(uintx, MaxRAMFraction, 4, \
2069 "Maximum fraction (1/n) of real memory used for maximum heap " \
2070 "size. " \
2071 "Deprecated, use MaxRAMPercentage instead") \
2072 range(1, max_uintx) \
2073 \
2074 product(uintx, MinRAMFraction, 2, \
2075 "Minimum fraction (1/n) of real memory used for maximum heap " \
2076 "size on systems with small physical memory size. " \
2077 "Deprecated, use MinRAMPercentage instead") \
2078 range(1, max_uintx) \
2079 \
2080 product(uintx, InitialRAMFraction, 64, \
2081 "Fraction (1/n) of real memory used for initial heap size. " \
2082 "Deprecated, use InitialRAMPercentage instead") \
2083 range(1, max_uintx) \
2084 \
2085 product(double, MaxRAMPercentage, 25.0, \
2086 "Maximum percentage of real memory used for maximum heap size") \
2087 range(0.0, 100.0) \
2088 \
2089 product(double, MinRAMPercentage, 50.0, \
2090 "Minimum percentage of real memory used for maximum heap" \
2091 "size on systems with small physical memory size") \
2092 range(0.0, 100.0) \
2093 \
2094 product(double, InitialRAMPercentage, 1.5625, \
2095 "Percentage of real memory used for initial heap size") \
2096 range(0.0, 100.0) \
2097 \
2098 develop(uintx, MaxVirtMemFraction, 2, \
2099 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2100 "determining maximum heap size") \
2101 \
2102 product(bool, UseAdaptiveSizePolicy, true, \
2103 "Use adaptive generation sizing policies") \
2104 \
2105 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2106 "Use adaptive survivor sizing policies") \
2107 \
2108 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2109 "Use adaptive young-old sizing policies at minor collections") \
2110 \
2111 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2112 "Use adaptive young-old sizing policies at major collections") \
2113 \
2114 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2115 "Include statistics from System.gc() for adaptive size policy") \
2116 \
2117 product(bool, UseAdaptiveGCBoundary, false, \
2118 "Allow young-old boundary to move") \
2119 \
2120 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2121 "Resize the virtual spaces of the young or old generations") \
2122 range(-1, 1) \
2123 \
2124 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2125 "Policy for changing generation size for throughput goals") \
2126 range(0, 1) \
2127 \
2128 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2129 "Number of steps where heuristics is used before data is used") \
2130 range(0, max_uintx) \
2131 \
2132 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2133 "Number of collections before the adaptive sizing is started") \
2134 \
2135 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2136 "Collection interval for printing information; zero means never") \
2137 range(0, max_uintx) \
2138 \
2139 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2140 "Use adaptive minimum footprint as a goal") \
2141 \
2142 product(uintx, AdaptiveSizePolicyWeight, 10, \
2143 "Weight given to exponential resizing, between 0 and 100") \
2144 range(0, 100) \
2145 \
2146 product(uintx, AdaptiveTimeWeight, 25, \
2147 "Weight given to time in adaptive policy, between 0 and 100") \
2148 range(0, 100) \
2149 \
2150 product(uintx, PausePadding, 1, \
2151 "How much buffer to keep for pause time") \
2152 range(0, max_juint) \
2153 \
2154 product(uintx, PromotedPadding, 3, \
2155 "How much buffer to keep for promotion failure") \
2156 range(0, max_juint) \
2157 \
2158 product(uintx, SurvivorPadding, 3, \
2159 "How much buffer to keep for survivor overflow") \
2160 range(0, max_juint) \
2161 \
2162 product(uintx, ThresholdTolerance, 10, \
2163 "Allowed collection cost difference between generations") \
2164 range(0, 100) \
2165 \
2166 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2167 "If collection costs are within margin, reduce both by full " \
2168 "delta") \
2169 range(0, 100) \
2170 \
2171 product(uintx, YoungGenerationSizeIncrement, 20, \
2172 "Adaptive size percentage change in young generation") \
2173 range(0, 100) \
2174 \
2175 product(uintx, YoungGenerationSizeSupplement, 80, \
2176 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2177 range(0, 100) \
2178 \
2179 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2180 "Decay factor to YoungedGenerationSizeSupplement") \
2181 range(1, max_uintx) \
2182 \
2183 product(uintx, TenuredGenerationSizeIncrement, 20, \
2184 "Adaptive size percentage change in tenured generation") \
2185 range(0, 100) \
2186 \
2187 product(uintx, TenuredGenerationSizeSupplement, 80, \
2188 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2189 range(0, 100) \
2190 \
2191 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2192 "Decay factor to TenuredGenerationSizeIncrement") \
2193 range(1, max_uintx) \
2194 \
2195 product(uintx, MaxGCPauseMillis, max_uintx - 1, \
2196 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2197 "or (G1 Only) the maximum GC time per MMU time slice") \
2198 range(1, max_uintx - 1) \
2199 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2200 \
2201 product(uintx, GCPauseIntervalMillis, 0, \
2202 "Time slice for MMU specification") \
2203 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2204 \
2205 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2206 "Adaptive size policy maximum GC minor pause time goal " \
2207 "in millisecond") \
2208 range(0, max_uintx) \
2209 \
2210 product(uintx, GCTimeRatio, 99, \
2211 "Adaptive size policy application time to GC time ratio") \
2212 range(0, max_juint) \
2213 \
2214 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2215 "Adaptive size scale down factor for shrinking") \
2216 range(1, max_uintx) \
2217 \
2218 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2219 "Adaptive size decays the major cost for long major intervals") \
2220 \
2221 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2222 "Time scale over which major costs decay") \
2223 range(0, max_uintx) \
2224 \
2225 product(uintx, MinSurvivorRatio, 3, \
2226 "Minimum ratio of young generation/survivor space size") \
2227 range(3, max_uintx) \
2228 \
2229 product(uintx, InitialSurvivorRatio, 8, \
2230 "Initial ratio of young generation/survivor space size") \
2231 range(0, max_uintx) \
2232 \
2233 product(size_t, BaseFootPrintEstimate, 256*M, \
2234 "Estimate of footprint other than Java Heap") \
2235 range(0, max_uintx) \
2236 \
2237 product(bool, UseGCOverheadLimit, true, \
2238 "Use policy to limit of proportion of time spent in GC " \
2239 "before an OutOfMemory error is thrown") \
2240 \
2241 product(uintx, GCTimeLimit, 98, \
2242 "Limit of the proportion of time spent in GC before " \
2243 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2244 range(0, 100) \
2245 \
2246 product(uintx, GCHeapFreeLimit, 2, \
2247 "Minimum percentage of free space after a full GC before an " \
2248 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2249 range(0, 100) \
2250 \
2251 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2252 "Number of consecutive collections before gc time limit fires") \
2253 range(1, max_uintx) \
2254 \
2255 product(intx, PrefetchCopyIntervalInBytes, -1, \
2256 "How far ahead to prefetch destination area (<= 0 means off)") \
2257 range(-1, max_jint) \
2258 \
2259 product(intx, PrefetchScanIntervalInBytes, -1, \
2260 "How far ahead to prefetch scan area (<= 0 means off)") \
2261 range(-1, max_jint) \
2262 \
2263 product(intx, PrefetchFieldsAhead, -1, \
2264 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2265 range(-1, max_jint) \
2266 \
2267 diagnostic(bool, VerifyDuringStartup, false, \
2268 "Verify memory system before executing any Java code " \
2269 "during VM initialization") \
2270 \
2271 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2272 "Verify system before exiting") \
2273 \
2274 diagnostic(bool, VerifyBeforeGC, false, \
2275 "Verify memory system before GC") \
2276 \
2277 diagnostic(bool, VerifyAfterGC, false, \
2278 "Verify memory system after GC") \
2279 \
2280 diagnostic(bool, VerifyDuringGC, false, \
2281 "Verify memory system during GC (between phases)") \
2282 \
2283 diagnostic(ccstrlist, VerifySubSet, "", \
2284 "Memory sub-systems to verify when Verify*GC flag(s) " \
2285 "are enabled. One or more sub-systems can be specified " \
2286 "in a comma separated string. Sub-systems are: " \
2287 "threads, heap, symbol_table, string_table, codecache, " \
2288 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2289 "codecache_oops") \
2290 \
2291 diagnostic(bool, GCParallelVerificationEnabled, true, \
2292 "Enable parallel memory system verification") \
2293 \
2294 diagnostic(bool, DeferInitialCardMark, false, \
2295 "When +ReduceInitialCardMarks, explicitly defer any that " \
2296 "may arise from new_pre_store_barrier") \
2297 \
2298 product(bool, UseCondCardMark, false, \
2299 "Check for already marked card before updating card table") \
2300 \
2301 diagnostic(bool, VerifyRememberedSets, false, \
2302 "Verify GC remembered sets") \
2303 \
2304 diagnostic(bool, VerifyObjectStartArray, true, \
2305 "Verify GC object start array if verify before/after") \
2306 \
2307 product(bool, DisableExplicitGC, false, \
2308 "Ignore calls to System.gc()") \
2309 \
2310 notproduct(bool, CheckMemoryInitialization, false, \
2311 "Check memory initialization") \
2312 \
2313 diagnostic(bool, BindCMSThreadToCPU, false, \
2314 "Bind CMS Thread to CPU if possible") \
2315 \
2316 diagnostic(uintx, CPUForCMSThread, 0, \
2317 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2318 range(0, max_juint) \
2319 \
2320 product(bool, BindGCTaskThreadsToCPUs, false, \
2321 "Bind GCTaskThreads to CPUs if possible") \
2322 \
2323 product(bool, UseGCTaskAffinity, false, \
2324 "Use worker affinity when asking for GCTasks") \
2325 \
2326 product(uintx, ProcessDistributionStride, 4, \
2327 "Stride through processors when distributing processes") \
2328 range(0, max_juint) \
2329 \
2330 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2331 "Number of times the coordinator GC thread will sleep while " \
2332 "yielding before giving up and resuming GC") \
2333 range(0, max_juint) \
2334 \
2335 product(uintx, CMSYieldSleepCount, 0, \
2336 "Number of times a GC thread (minus the coordinator) " \
2337 "will sleep while yielding before giving up and resuming GC") \
2338 range(0, max_juint) \
2339 \
2340 product(bool, PrintGC, false, \
2341 "Print message at garbage collection. " \
2342 "Deprecated, use -Xlog:gc instead.") \
2343 \
2344 product(bool, PrintGCDetails, false, \
2345 "Print more details at garbage collection. " \
2346 "Deprecated, use -Xlog:gc* instead.") \
2347 \
2348 develop(intx, ConcGCYieldTimeout, 0, \
2349 "If non-zero, assert that GC threads yield within this " \
2350 "number of milliseconds") \
2351 range(0, max_intx) \
2352 \
2353 develop(bool, TraceFinalizerRegistration, false, \
2354 "Trace registration of final references") \
2355 \
2356 notproduct(bool, TraceScavenge, false, \
2357 "Trace scavenge") \
2358 \
2359 product(bool, IgnoreEmptyClassPaths, false, \
2360 "Ignore empty path elements in -classpath") \
2361 \
2362 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2363 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2364 "Initial size of the boot class loader data metaspace") \
2365 range(30*K, max_uintx/BytesPerWord) \
2366 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2367 \
2368 product(bool, TraceYoungGenTime, false, \
2369 "Trace accumulated time for young collection") \
2370 \
2371 product(bool, TraceOldGenTime, false, \
2372 "Trace accumulated time for old collection") \
2373 \
2374 product(bool, PrintHeapAtSIGBREAK, true, \
2375 "Print heap layout in response to SIGBREAK") \
2376 \
2377 manageable(bool, PrintClassHistogram, false, \
2378 "Print a histogram of class instances") \
2379 \
2380 develop(bool, TraceGCTaskManager, false, \
2381 "Trace actions of the GC task manager") \
2382 \
2383 develop(bool, TraceGCTaskQueue, false, \
2384 "Trace actions of the GC task queues") \
2385 \
2386 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2387 "Trace marking phase in ParallelOldGC") \
2388 \
2389 develop(bool, TraceParallelOldGCDensePrefix, false, \
2390 "Trace dense prefix computation for ParallelOldGC") \
2391 \
2392 develop(bool, IgnoreLibthreadGPFault, false, \
2393 "Suppress workaround for libthread GP fault") \
2394 \
2395 experimental(double, ObjectCountCutOffPercent, 0.5, \
2396 "The percentage of the used heap that the instances of a class " \
2397 "must occupy for the class to generate a trace event") \
2398 range(0.0, 100.0) \
2399 \
2400 /* JVMTI heap profiling */ \
2401 \
2402 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2403 "Trace JVMTI object tagging calls") \
2404 \
2405 diagnostic(bool, VerifyBeforeIteration, false, \
2406 "Verify memory system before JVMTI iteration") \
2407 \
2408 /* compiler interface */ \
2409 \
2410 develop(bool, CIPrintCompilerName, false, \
2411 "when CIPrint is active, print the name of the active compiler") \
2412 \
2413 diagnostic(bool, CIPrintCompileQueue, false, \
2414 "display the contents of the compile queue whenever a " \
2415 "compilation is enqueued") \
2416 \
2417 develop(bool, CIPrintRequests, false, \
2418 "display every request for compilation") \
2419 \
2420 product(bool, CITime, false, \
2421 "collect timing information for compilation") \
2422 \
2423 develop(bool, CITimeVerbose, false, \
2424 "be more verbose in compilation timings") \
2425 \
2426 develop(bool, CITimeEach, false, \
2427 "display timing information after each successful compilation") \
2428 \
2429 develop(bool, CICountOSR, false, \
2430 "use a separate counter when assigning ids to osr compilations") \
2431 \
2432 develop(bool, CICompileNatives, true, \
2433 "compile native methods if supported by the compiler") \
2434 \
2435 develop_pd(bool, CICompileOSR, \
2436 "compile on stack replacement methods if supported by the " \
2437 "compiler") \
2438 \
2439 develop(bool, CIPrintMethodCodes, false, \
2440 "print method bytecodes of the compiled code") \
2441 \
2442 develop(bool, CIPrintTypeFlow, false, \
2443 "print the results of ciTypeFlow analysis") \
2444 \
2445 develop(bool, CITraceTypeFlow, false, \
2446 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2447 \
2448 develop(intx, OSROnlyBCI, -1, \
2449 "OSR only at this bci. Negative values mean exclude that bci") \
2450 \
2451 /* compiler */ \
2452 \
2453 /* notice: the max range value here is max_jint, not max_intx */ \
2454 /* because of overflow issue */ \
2455 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2456 "Number of compiler threads to run") \
2457 range(0, max_jint) \
2458 constraint(CICompilerCountConstraintFunc, AfterErgo) \
2459 \
2460 product(intx, CompilationPolicyChoice, 0, \
2461 "which compilation policy (0-3)") \
2462 range(0, 3) \
2463 \
2464 develop(bool, UseStackBanging, true, \
2465 "use stack banging for stack overflow checks (required for " \
2466 "proper StackOverflow handling; disable only to measure cost " \
2467 "of stackbanging)") \
2468 \
2469 develop(bool, UseStrictFP, true, \
2470 "use strict fp if modifier strictfp is set") \
2471 \
2472 develop(bool, GenerateSynchronizationCode, true, \
2473 "generate locking/unlocking code for synchronized methods and " \
2474 "monitors") \
2475 \
2476 develop(bool, GenerateRangeChecks, true, \
2477 "Generate range checks for array accesses") \
2478 \
2479 diagnostic_pd(bool, ImplicitNullChecks, \
2480 "Generate code for implicit null checks") \
2481 \
2482 product_pd(bool, TrapBasedNullChecks, \
2483 "Generate code for null checks that uses a cmp and trap " \
2484 "instruction raising SIGTRAP. This is only used if an access to" \
2485 "null (+offset) will not raise a SIGSEGV, i.e.," \
2486 "ImplicitNullChecks don't work (PPC64).") \
2487 \
2488 product(bool, PrintSafepointStatistics, false, \
2489 "Print statistics about safepoint synchronization") \
2490 \
2491 product(intx, PrintSafepointStatisticsCount, 300, \
2492 "Total number of safepoint statistics collected " \
2493 "before printing them out") \
2494 range(1, max_intx) \
2495 \
2496 product(intx, PrintSafepointStatisticsTimeout, -1, \
2497 "Print safepoint statistics only when safepoint takes " \
2498 "more than PrintSafepointSatisticsTimeout in millis") \
2499 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2500 NOT_LP64(range(-1, max_intx)) \
2501 \
2502 product(bool, Inline, true, \
2503 "Enable inlining") \
2504 \
2505 product(bool, ClipInlining, true, \
2506 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2507 \
2508 develop(bool, UseCHA, true, \
2509 "Enable CHA") \
2510 \
2511 product(bool, UseTypeProfile, true, \
2512 "Check interpreter profile for historically monomorphic calls") \
2513 \
2514 diagnostic(bool, PrintInlining, false, \
2515 "Print inlining optimizations") \
2516 \
2517 product(bool, UsePopCountInstruction, false, \
2518 "Use population count instruction") \
2519 \
2520 develop(bool, EagerInitialization, false, \
2521 "Eagerly initialize classes if possible") \
2522 \
2523 diagnostic(bool, LogTouchedMethods, false, \
2524 "Log methods which have been ever touched in runtime") \
2525 \
2526 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2527 "Print all methods that have been ever touched in runtime") \
2528 \
2529 develop(bool, TraceMethodReplacement, false, \
2530 "Print when methods are replaced do to recompilation") \
2531 \
2532 develop(bool, PrintMethodFlushing, false, \
2533 "Print the nmethods being flushed") \
2534 \
2535 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2536 "print statistics about method flushing") \
2537 \
2538 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2539 "Number of compiled code invocations after which " \
2540 "the method is considered as hot by the flusher") \
2541 range(1, max_jint) \
2542 \
2543 diagnostic(intx, MinPassesBeforeFlush, 10, \
2544 "Minimum number of sweeper passes before an nmethod " \
2545 "can be flushed") \
2546 range(0, max_intx) \
2547 \
2548 product(bool, UseCodeAging, true, \
2549 "Insert counter to detect warm methods") \
2550 \
2551 diagnostic(bool, StressCodeAging, false, \
2552 "Start with counters compiled in") \
2553 \
2554 develop(bool, StressCodeBuffers, false, \
2555 "Exercise code buffer expansion and other rare state changes") \
2556 \
2557 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2558 "Generate extra debugging information for non-safepoints in " \
2559 "nmethods") \
2560 \
2561 product(bool, PrintVMOptions, false, \
2562 "Print flags that appeared on the command line") \
2563 \
2564 product(bool, IgnoreUnrecognizedVMOptions, false, \
2565 "Ignore unrecognized VM options") \
2566 \
2567 product(bool, PrintCommandLineFlags, false, \
2568 "Print flags specified on command line or set by ergonomics") \
2569 \
2570 product(bool, PrintFlagsInitial, false, \
2571 "Print all VM flags before argument processing and exit VM") \
2572 \
2573 product(bool, PrintFlagsFinal, false, \
2574 "Print all VM flags after argument and ergonomic processing") \
2575 \
2576 notproduct(bool, PrintFlagsWithComments, false, \
2577 "Print all VM flags with default values and descriptions and " \
2578 "exit") \
2579 \
2580 product(bool, PrintFlagsRanges, false, \
2581 "Print VM flags and their ranges and exit VM") \
2582 \
2583 diagnostic(bool, SerializeVMOutput, true, \
2584 "Use a mutex to serialize output to tty and LogFile") \
2585 \
2586 diagnostic(bool, DisplayVMOutput, true, \
2587 "Display all VM output on the tty, independently of LogVMOutput") \
2588 \
2589 diagnostic(bool, LogVMOutput, false, \
2590 "Save VM output to LogFile") \
2591 \
2592 diagnostic(ccstr, LogFile, NULL, \
2593 "If LogVMOutput or LogCompilation is on, save VM output to " \
2594 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2595 \
2596 product(ccstr, ErrorFile, NULL, \
2597 "If an error occurs, save the error data to this file " \
2598 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2599 \
2600 product(bool, DisplayVMOutputToStderr, false, \
2601 "If DisplayVMOutput is true, display all VM output to stderr") \
2602 \
2603 product(bool, DisplayVMOutputToStdout, false, \
2604 "If DisplayVMOutput is true, display all VM output to stdout") \
2605 \
2606 product(bool, UseHeavyMonitors, false, \
2607 "use heavyweight instead of lightweight Java monitors") \
2608 \
2609 product(bool, PrintStringTableStatistics, false, \
2610 "print statistics about the StringTable and SymbolTable") \
2611 \
2612 diagnostic(bool, VerifyStringTableAtExit, false, \
2613 "verify StringTable contents at exit") \
2614 \
2615 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2616 "print histogram of the symbol table") \
2617 \
2618 notproduct(bool, ExitVMOnVerifyError, false, \
2619 "standard exit from VM if bytecode verify error " \
2620 "(only in debug mode)") \
2621 \
2622 diagnostic(ccstr, AbortVMOnException, NULL, \
2623 "Call fatal if this exception is thrown. Example: " \
2624 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2625 \
2626 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2627 "Call fatal if the exception pointed by AbortVMOnException " \
2628 "has this message") \
2629 \
2630 develop(bool, DebugVtables, false, \
2631 "add debugging code to vtable dispatch") \
2632 \
2633 notproduct(bool, PrintVtableStats, false, \
2634 "print vtables stats at end of run") \
2635 \
2636 develop(bool, TraceCreateZombies, false, \
2637 "trace creation of zombie nmethods") \
2638 \
2639 notproduct(bool, IgnoreLockingAssertions, false, \
2640 "disable locking assertions (for speed)") \
2641 \
2642 product(bool, RangeCheckElimination, true, \
2643 "Eliminate range checks") \
2644 \
2645 develop_pd(bool, UncommonNullCast, \
2646 "track occurrences of null in casts; adjust compiler tactics") \
2647 \
2648 develop(bool, TypeProfileCasts, true, \
2649 "treat casts like calls for purposes of type profiling") \
2650 \
2651 develop(bool, DelayCompilationDuringStartup, true, \
2652 "Delay invoking the compiler until main application class is " \
2653 "loaded") \
2654 \
2655 develop(bool, CompileTheWorld, false, \
2656 "Compile all methods in all classes in bootstrap class path " \
2657 "(stress test)") \
2658 \
2659 develop(bool, CompileTheWorldPreloadClasses, true, \
2660 "Preload all classes used by a class before start loading") \
2661 \
2662 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2663 "Force a safepoint every n compiles so sweeper can keep up") \
2664 \
2665 develop(bool, FillDelaySlots, true, \
2666 "Fill delay slots (on SPARC only)") \
2667 \
2668 develop(bool, TimeLivenessAnalysis, false, \
2669 "Time computation of bytecode liveness analysis") \
2670 \
2671 develop(bool, TraceLivenessGen, false, \
2672 "Trace the generation of liveness analysis information") \
2673 \
2674 notproduct(bool, TraceLivenessQuery, false, \
2675 "Trace queries of liveness analysis information") \
2676 \
2677 notproduct(bool, CollectIndexSetStatistics, false, \
2678 "Collect information about IndexSets") \
2679 \
2680 develop(bool, UseLoopSafepoints, true, \
2681 "Generate Safepoint nodes in every loop") \
2682 \
2683 develop(intx, FastAllocateSizeLimit, 128*K, \
2684 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2685 "Inline allocations larger than this in doublewords must go slow")\
2686 \
2687 product(bool, AggressiveOpts, false, \
2688 "Enable aggressive optimizations - see arguments.cpp") \
2689 \
2690 product_pd(bool, CompactStrings, \
2691 "Enable Strings to use single byte chars in backing store") \
2692 \
2693 product_pd(uintx, TypeProfileLevel, \
2694 "=XYZ, with Z: Type profiling of arguments at call; " \
2695 "Y: Type profiling of return value at call; " \
2696 "X: Type profiling of parameters to methods; " \
2697 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2698 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2699 \
2700 product(intx, TypeProfileArgsLimit, 2, \
2701 "max number of call arguments to consider for type profiling") \
2702 range(0, 16) \
2703 \
2704 product(intx, TypeProfileParmsLimit, 2, \
2705 "max number of incoming parameters to consider for type profiling"\
2706 ", -1 for all") \
2707 range(-1, 64) \
2708 \
2709 /* statistics */ \
2710 develop(bool, CountCompiledCalls, false, \
2711 "Count method invocations") \
2712 \
2713 notproduct(bool, CountRuntimeCalls, false, \
2714 "Count VM runtime calls") \
2715 \
2716 develop(bool, CountJNICalls, false, \
2717 "Count jni method invocations") \
2718 \
2719 notproduct(bool, CountJVMCalls, false, \
2720 "Count jvm method invocations") \
2721 \
2722 notproduct(bool, CountRemovableExceptions, false, \
2723 "Count exceptions that could be replaced by branches due to " \
2724 "inlining") \
2725 \
2726 notproduct(bool, ICMissHistogram, false, \
2727 "Produce histogram of IC misses") \
2728 \
2729 /* interpreter */ \
2730 product_pd(bool, RewriteBytecodes, \
2731 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2732 \
2733 product_pd(bool, RewriteFrequentPairs, \
2734 "Rewrite frequently used bytecode pairs into a single bytecode") \
2735 \
2736 diagnostic(bool, PrintInterpreter, false, \
2737 "Print the generated interpreter code") \
2738 \
2739 product(bool, UseInterpreter, true, \
2740 "Use interpreter for non-compiled methods") \
2741 \
2742 develop(bool, UseFastSignatureHandlers, true, \
2743 "Use fast signature handlers for native calls") \
2744 \
2745 product(bool, UseLoopCounter, true, \
2746 "Increment invocation counter on backward branch") \
2747 \
2748 product_pd(bool, UseOnStackReplacement, \
2749 "Use on stack replacement, calls runtime if invoc. counter " \
2750 "overflows in loop") \
2751 \
2752 notproduct(bool, TraceOnStackReplacement, false, \
2753 "Trace on stack replacement") \
2754 \
2755 product_pd(bool, PreferInterpreterNativeStubs, \
2756 "Use always interpreter stubs for native methods invoked via " \
2757 "interpreter") \
2758 \
2759 develop(bool, CountBytecodes, false, \
2760 "Count number of bytecodes executed") \
2761 \
2762 develop(bool, PrintBytecodeHistogram, false, \
2763 "Print histogram of the executed bytecodes") \
2764 \
2765 develop(bool, PrintBytecodePairHistogram, false, \
2766 "Print histogram of the executed bytecode pairs") \
2767 \
2768 diagnostic(bool, PrintSignatureHandlers, false, \
2769 "Print code generated for native method signature handlers") \
2770 \
2771 develop(bool, VerifyOops, false, \
2772 "Do plausibility checks for oops") \
2773 \
2774 develop(bool, CheckUnhandledOops, false, \
2775 "Check for unhandled oops in VM code") \
2776 \
2777 develop(bool, VerifyJNIFields, trueInDebug, \
2778 "Verify jfieldIDs for instance fields") \
2779 \
2780 notproduct(bool, VerifyJNIEnvThread, false, \
2781 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2782 "from JNI") \
2783 \
2784 develop(bool, VerifyFPU, false, \
2785 "Verify FPU state (check for NaN's, etc.)") \
2786 \
2787 develop(bool, VerifyThread, false, \
2788 "Watch the thread register for corruption (SPARC only)") \
2789 \
2790 develop(bool, VerifyActivationFrameSize, false, \
2791 "Verify that activation frame didn't become smaller than its " \
2792 "minimal size") \
2793 \
2794 develop(bool, TraceFrequencyInlining, false, \
2795 "Trace frequency based inlining") \
2796 \
2797 develop_pd(bool, InlineIntrinsics, \
2798 "Inline intrinsics that can be statically resolved") \
2799 \
2800 product_pd(bool, ProfileInterpreter, \
2801 "Profile at the bytecode level during interpretation") \
2802 \
2803 develop(bool, TraceProfileInterpreter, false, \
2804 "Trace profiling at the bytecode level during interpretation. " \
2805 "This outputs the profiling information collected to improve " \
2806 "jit compilation.") \
2807 \
2808 develop_pd(bool, ProfileTraps, \
2809 "Profile deoptimization traps at the bytecode level") \
2810 \
2811 product(intx, ProfileMaturityPercentage, 20, \
2812 "number of method invocations/branches (expressed as % of " \
2813 "CompileThreshold) before using the method's profile") \
2814 range(0, 100) \
2815 \
2816 diagnostic(bool, PrintMethodData, false, \
2817 "Print the results of +ProfileInterpreter at end of run") \
2818 \
2819 develop(bool, VerifyDataPointer, trueInDebug, \
2820 "Verify the method data pointer during interpreter profiling") \
2821 \
2822 develop(bool, VerifyCompiledCode, false, \
2823 "Include miscellaneous runtime verifications in nmethod code; " \
2824 "default off because it disturbs nmethod size heuristics") \
2825 \
2826 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2827 "Manually make GC thread crash then dump java stack trace; " \
2828 "Test only") \
2829 \
2830 /* compilation */ \
2831 product(bool, UseCompiler, true, \
2832 "Use Just-In-Time compilation") \
2833 \
2834 develop(bool, TraceCompilationPolicy, false, \
2835 "Trace compilation policy") \
2836 \
2837 develop(bool, TimeCompilationPolicy, false, \
2838 "Time the compilation policy") \
2839 \
2840 product(bool, UseCounterDecay, true, \
2841 "Adjust recompilation counters") \
2842 \
2843 develop(intx, CounterHalfLifeTime, 30, \
2844 "Half-life time of invocation counters (in seconds)") \
2845 \
2846 develop(intx, CounterDecayMinIntervalLength, 500, \
2847 "The minimum interval (in milliseconds) between invocation of " \
2848 "CounterDecay") \
2849 \
2850 product(bool, AlwaysCompileLoopMethods, false, \
2851 "When using recompilation, never interpret methods " \
2852 "containing loops") \
2853 \
2854 product(bool, DontCompileHugeMethods, true, \
2855 "Do not compile methods > HugeMethodLimit") \
2856 \
2857 /* Bytecode escape analysis estimation. */ \
2858 product(bool, EstimateArgEscape, true, \
2859 "Analyze bytecodes to estimate escape state of arguments") \
2860 \
2861 product(intx, BCEATraceLevel, 0, \
2862 "How much tracing to do of bytecode escape analysis estimates " \
2863 "(0-3)") \
2864 range(0, 3) \
2865 \
2866 product(intx, MaxBCEAEstimateLevel, 5, \
2867 "Maximum number of nested calls that are analyzed by BC EA") \
2868 range(0, max_jint) \
2869 \
2870 product(intx, MaxBCEAEstimateSize, 150, \
2871 "Maximum bytecode size of a method to be analyzed by BC EA") \
2872 range(0, max_jint) \
2873 \
2874 product(intx, AllocatePrefetchStyle, 1, \
2875 "0 = no prefetch, " \
2876 "1 = generate prefetch instructions for each allocation, " \
2877 "2 = use TLAB watermark to gate allocation prefetch, " \
2878 "3 = generate one prefetch instruction per cache line") \
2879 range(0, 3) \
2880 \
2881 product(intx, AllocatePrefetchDistance, -1, \
2882 "Distance to prefetch ahead of allocation pointer. " \
2883 "-1: use system-specific value (automatically determined") \
2884 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2885 \
2886 product(intx, AllocatePrefetchLines, 3, \
2887 "Number of lines to prefetch ahead of array allocation pointer") \
2888 range(1, 64) \
2889 \
2890 product(intx, AllocateInstancePrefetchLines, 1, \
2891 "Number of lines to prefetch ahead of instance allocation " \
2892 "pointer") \
2893 range(1, 64) \
2894 \
2895 product(intx, AllocatePrefetchStepSize, 16, \
2896 "Step size in bytes of sequential prefetch instructions") \
2897 range(1, 512) \
2898 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2899 \
2900 product(intx, AllocatePrefetchInstr, 0, \
2901 "Select instruction to prefetch ahead of allocation pointer") \
2902 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
2903 \
2904 /* deoptimization */ \
2905 develop(bool, TraceDeoptimization, false, \
2906 "Trace deoptimization") \
2907 \
2908 develop(bool, PrintDeoptimizationDetails, false, \
2909 "Print more information about deoptimization") \
2910 \
2911 develop(bool, DebugDeoptimization, false, \
2912 "Tracing various information while debugging deoptimization") \
2913 \
2914 product(intx, SelfDestructTimer, 0, \
2915 "Will cause VM to terminate after a given time (in minutes) " \
2916 "(0 means off)") \
2917 range(0, max_intx) \
2918 \
2919 product(intx, MaxJavaStackTraceDepth, 1024, \
2920 "The maximum number of lines in the stack trace for Java " \
2921 "exceptions (0 means all)") \
2922 range(0, max_jint/2) \
2923 \
2924 /* notice: the max range value here is max_jint, not max_intx */ \
2925 /* because of overflow issue */ \
2926 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2927 "Guarantee a safepoint (at least) every so many milliseconds " \
2928 "(0 means none)") \
2929 range(0, max_jint) \
2930 \
2931 product(intx, SafepointTimeoutDelay, 10000, \
2932 "Delay in milliseconds for option SafepointTimeout") \
2933 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
2934 NOT_LP64(range(0, max_intx)) \
2935 \
2936 product(intx, NmethodSweepActivity, 10, \
2937 "Removes cold nmethods from code cache if > 0. Higher values " \
2938 "result in more aggressive sweeping") \
2939 range(0, 2000) \
2940 \
2941 notproduct(bool, LogSweeper, false, \
2942 "Keep a ring buffer of sweeper activity") \
2943 \
2944 notproduct(intx, SweeperLogEntries, 1024, \
2945 "Number of records in the ring buffer of sweeper activity") \
2946 \
2947 notproduct(intx, MemProfilingInterval, 500, \
2948 "Time between each invocation of the MemProfiler") \
2949 \
2950 develop(intx, MallocCatchPtr, -1, \
2951 "Hit breakpoint when mallocing/freeing this pointer") \
2952 \
2953 notproduct(ccstrlist, SuppressErrorAt, "", \
2954 "List of assertions (file:line) to muzzle") \
2955 \
2956 develop(intx, StackPrintLimit, 100, \
2957 "number of stack frames to print in VM-level stack dump") \
2958 \
2959 notproduct(intx, MaxElementPrintSize, 256, \
2960 "maximum number of elements to print") \
2961 \
2962 notproduct(intx, MaxSubklassPrintSize, 4, \
2963 "maximum number of subklasses to print when printing klass") \
2964 \
2965 product(intx, MaxInlineLevel, 9, \
2966 "maximum number of nested calls that are inlined") \
2967 range(0, max_jint) \
2968 \
2969 product(intx, MaxRecursiveInlineLevel, 1, \
2970 "maximum number of nested recursive calls that are inlined") \
2971 range(0, max_jint) \
2972 \
2973 develop(intx, MaxForceInlineLevel, 100, \
2974 "maximum number of nested calls that are forced for inlining " \
2975 "(using CompileCommand or marked w/ @ForceInline)") \
2976 range(0, max_jint) \
2977 \
2978 product_pd(intx, InlineSmallCode, \
2979 "Only inline already compiled methods if their code size is " \
2980 "less than this") \
2981 range(0, max_jint) \
2982 \
2983 product(intx, MaxInlineSize, 35, \
2984 "The maximum bytecode size of a method to be inlined") \
2985 range(0, max_jint) \
2986 \
2987 product_pd(intx, FreqInlineSize, \
2988 "The maximum bytecode size of a frequent method to be inlined") \
2989 range(0, max_jint) \
2990 \
2991 product(intx, MaxTrivialSize, 6, \
2992 "The maximum bytecode size of a trivial method to be inlined") \
2993 range(0, max_jint) \
2994 \
2995 product(intx, MinInliningThreshold, 250, \
2996 "The minimum invocation count a method needs to have to be " \
2997 "inlined") \
2998 range(0, max_jint) \
2999 \
3000 develop(intx, MethodHistogramCutoff, 100, \
3001 "The cutoff value for method invocation histogram (+CountCalls)") \
3002 \
3003 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
3004 "Number of interpreted methods to show in profile") \
3005 \
3006 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
3007 "Number of compiled methods to show in profile") \
3008 \
3009 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
3010 "Number of stub methods to show in profile") \
3011 \
3012 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3013 "Number of runtime stub nodes to show in profile") \
3014 \
3015 product(intx, ProfileIntervalsTicks, 100, \
3016 "Number of ticks between printing of interval profile " \
3017 "(+ProfileIntervals)") \
3018 range(0, max_intx) \
3019 \
3020 notproduct(intx, ScavengeALotInterval, 1, \
3021 "Interval between which scavenge will occur with +ScavengeALot") \
3022 \
3023 notproduct(intx, FullGCALotInterval, 1, \
3024 "Interval between which full gc will occur with +FullGCALot") \
3025 \
3026 notproduct(intx, FullGCALotStart, 0, \
3027 "For which invocation to start FullGCAlot") \
3028 \
3029 notproduct(intx, FullGCALotDummies, 32*K, \
3030 "Dummy object allocated with +FullGCALot, forcing all objects " \
3031 "to move") \
3032 \
3033 develop(intx, DontYieldALotInterval, 10, \
3034 "Interval between which yields will be dropped (milliseconds)") \
3035 \
3036 develop(intx, ProfilerPCTickThreshold, 15, \
3037 "Number of ticks in a PC buckets to be a hotspot") \
3038 \
3039 notproduct(intx, DeoptimizeALotInterval, 5, \
3040 "Number of exits until DeoptimizeALot kicks in") \
3041 \
3042 notproduct(intx, ZombieALotInterval, 5, \
3043 "Number of exits until ZombieALot kicks in") \
3044 \
3045 diagnostic(uintx, MallocMaxTestWords, 0, \
3046 "If non-zero, maximum number of words that malloc/realloc can " \
3047 "allocate (for testing only)") \
3048 range(0, max_uintx) \
3049 \
3050 product(intx, TypeProfileWidth, 2, \
3051 "Number of receiver types to record in call/cast profile") \
3052 range(0, 8) \
3053 \
3054 develop(intx, BciProfileWidth, 2, \
3055 "Number of return bci's to record in ret profile") \
3056 \
3057 product(intx, PerMethodRecompilationCutoff, 400, \
3058 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3059 range(-1, max_intx) \
3060 \
3061 product(intx, PerBytecodeRecompilationCutoff, 200, \
3062 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3063 range(-1, max_intx) \
3064 \
3065 product(intx, PerMethodTrapLimit, 100, \
3066 "Limit on traps (of one kind) in a method (includes inlines)") \
3067 range(0, max_jint) \
3068 \
3069 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3070 "Limit on speculative traps (of one kind) in a method " \
3071 "(includes inlines)") \
3072 range(0, max_jint) \
3073 \
3074 product(intx, PerBytecodeTrapLimit, 4, \
3075 "Limit on traps (of one kind) at a particular BCI") \
3076 range(0, max_jint) \
3077 \
3078 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3079 "Extra method data trap entries for speculation") \
3080 \
3081 develop(intx, InlineFrequencyRatio, 20, \
3082 "Ratio of call site execution to caller method invocation") \
3083 range(0, max_jint) \
3084 \
3085 diagnostic_pd(intx, InlineFrequencyCount, \
3086 "Count of call site execution necessary to trigger frequent " \
3087 "inlining") \
3088 range(0, max_jint) \
3089 \
3090 develop(intx, InlineThrowCount, 50, \
3091 "Force inlining of interpreted methods that throw this often") \
3092 range(0, max_jint) \
3093 \
3094 develop(intx, InlineThrowMaxSize, 200, \
3095 "Force inlining of throwing methods smaller than this") \
3096 range(0, max_jint) \
3097 \
3098 develop(intx, ProfilerNodeSize, 1024, \
3099 "Size in K to allocate for the Profile Nodes of each thread") \
3100 range(0, 1024) \
3101 \
3102 /* gc parameters */ \
3103 product(size_t, InitialHeapSize, 0, \
3104 "Initial heap size (in bytes); zero means use ergonomics") \
3105 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3106 \
3107 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3108 "Maximum heap size (in bytes)") \
3109 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3110 \
3111 product(size_t, OldSize, ScaleForWordSize(4*M), \
3112 "Initial tenured generation size (in bytes)") \
3113 range(0, max_uintx) \
3114 \
3115 product(size_t, NewSize, ScaleForWordSize(1*M), \
3116 "Initial new generation size (in bytes)") \
3117 constraint(NewSizeConstraintFunc,AfterErgo) \
3118 \
3119 product(size_t, MaxNewSize, max_uintx, \
3120 "Maximum new generation size (in bytes), max_uintx means set " \
3121 "ergonomically") \
3122 range(0, max_uintx) \
3123 \
3124 product_pd(size_t, HeapBaseMinAddress, \
3125 "OS specific low limit for heap base address") \
3126 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3127 \
3128 product(size_t, PretenureSizeThreshold, 0, \
3129 "Maximum size in bytes of objects allocated in DefNew " \
3130 "generation; zero means no maximum") \
3131 range(0, max_uintx) \
3132 \
3133 product(size_t, MinTLABSize, 2*K, \
3134 "Minimum allowed TLAB size (in bytes)") \
3135 range(1, max_uintx/2) \
3136 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3137 \
3138 product(size_t, TLABSize, 0, \
3139 "Starting TLAB size (in bytes); zero means set ergonomically") \
3140 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3141 \
3142 product(size_t, YoungPLABSize, 4096, \
3143 "Size of young gen promotion LAB's (in HeapWords)") \
3144 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3145 \
3146 product(size_t, OldPLABSize, 1024, \
3147 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3148 "of blocks to attempt to claim when refilling CMS LAB's") \
3149 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3150 \
3151 product(uintx, TLABAllocationWeight, 35, \
3152 "Allocation averaging weight") \
3153 range(0, 100) \
3154 \
3155 /* Limit the lower bound of this flag to 1 as it is used */ \
3156 /* in a division expression. */ \
3157 product(uintx, TLABWasteTargetPercent, 1, \
3158 "Percentage of Eden that can be wasted") \
3159 range(1, 100) \
3160 \
3161 product(uintx, TLABRefillWasteFraction, 64, \
3162 "Maximum TLAB waste at a refill (internal fragmentation)") \
3163 range(1, max_juint) \
3164 \
3165 product(uintx, TLABWasteIncrement, 4, \
3166 "Increment allowed waste at slow allocation") \
3167 range(0, max_jint) \
3168 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3169 \
3170 product(uintx, SurvivorRatio, 8, \
3171 "Ratio of eden/survivor space size") \
3172 range(1, max_uintx-2) \
3173 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3174 \
3175 product(uintx, NewRatio, 2, \
3176 "Ratio of old/new generation sizes") \
3177 range(0, max_uintx-1) \
3178 \
3179 product_pd(size_t, NewSizeThreadIncrease, \
3180 "Additional size added to desired new generation size per " \
3181 "non-daemon thread (in bytes)") \
3182 range(0, max_uintx) \
3183 \
3184 product_pd(size_t, MetaspaceSize, \
3185 "Initial threshold (in bytes) at which a garbage collection " \
3186 "is done to reduce Metaspace usage") \
3187 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3188 \
3189 product(size_t, MaxMetaspaceSize, max_uintx, \
3190 "Maximum size of Metaspaces (in bytes)") \
3191 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3192 \
3193 product(size_t, CompressedClassSpaceSize, 1*G, \
3194 "Maximum size of class area in Metaspace when compressed " \
3195 "class pointers are used") \
3196 range(1*M, 3*G) \
3197 \
3198 manageable(uintx, MinHeapFreeRatio, 40, \
3199 "The minimum percentage of heap free after GC to avoid expansion."\
3200 " For most GCs this applies to the old generation. In G1 and" \
3201 " ParallelGC it applies to the whole heap.") \
3202 range(0, 100) \
3203 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3204 \
3205 manageable(uintx, MaxHeapFreeRatio, 70, \
3206 "The maximum percentage of heap free after GC to avoid shrinking."\
3207 " For most GCs this applies to the old generation. In G1 and" \
3208 " ParallelGC it applies to the whole heap.") \
3209 range(0, 100) \
3210 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3211 \
3212 product(bool, ShrinkHeapInSteps, true, \
3213 "When disabled, informs the GC to shrink the java heap directly" \
3214 " to the target size at the next full GC rather than requiring" \
3215 " smaller steps during multiple full GCs.") \
3216 \
3217 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3218 "Number of milliseconds per MB of free space in the heap") \
3219 range(0, max_intx) \
3220 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3221 \
3222 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3223 "The minimum change in heap space due to GC (in bytes)") \
3224 range(0, max_uintx) \
3225 \
3226 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3227 "The minimum expansion of Metaspace (in bytes)") \
3228 range(0, max_uintx) \
3229 \
3230 product(uintx, MaxMetaspaceFreeRatio, 70, \
3231 "The maximum percentage of Metaspace free after GC to avoid " \
3232 "shrinking") \
3233 range(0, 100) \
3234 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3235 \
3236 product(uintx, MinMetaspaceFreeRatio, 40, \
3237 "The minimum percentage of Metaspace free after GC to avoid " \
3238 "expansion") \
3239 range(0, 99) \
3240 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3241 \
3242 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3243 "The maximum expansion of Metaspace without full GC (in bytes)") \
3244 range(0, max_uintx) \
3245 \
3246 product(uintx, QueuedAllocationWarningCount, 0, \
3247 "Number of times an allocation that queues behind a GC " \
3248 "will retry before printing a warning") \
3249 range(0, max_uintx) \
3250 \
3251 diagnostic(uintx, VerifyGCStartAt, 0, \
3252 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3253 range(0, max_uintx) \
3254 \
3255 diagnostic(intx, VerifyGCLevel, 0, \
3256 "Generation level at which to start +VerifyBefore/AfterGC") \
3257 range(0, 1) \
3258 \
3259 product(uintx, MaxTenuringThreshold, 15, \
3260 "Maximum value for tenuring threshold") \
3261 range(0, markOopDesc::max_age + 1) \
3262 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3263 \
3264 product(uintx, InitialTenuringThreshold, 7, \
3265 "Initial value for tenuring threshold") \
3266 range(0, markOopDesc::max_age + 1) \
3267 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3268 \
3269 product(uintx, TargetSurvivorRatio, 50, \
3270 "Desired percentage of survivor space used after scavenge") \
3271 range(0, 100) \
3272 \
3273 product(uintx, MarkSweepDeadRatio, 5, \
3274 "Percentage (0-100) of the old gen allowed as dead wood. " \
3275 "Serial mark sweep treats this as both the minimum and maximum " \
3276 "value. " \
3277 "CMS uses this value only if it falls back to mark sweep. " \
3278 "Par compact uses a variable scale based on the density of the " \
3279 "generation and treats this as the maximum value when the heap " \
3280 "is either completely full or completely empty. Par compact " \
3281 "also has a smaller default value; see arguments.cpp.") \
3282 range(0, 100) \
3283 \
3284 product(uint, MarkSweepAlwaysCompactCount, 4, \
3285 "How often should we fully compact the heap (ignoring the dead " \
3286 "space parameters)") \
3287 range(1, max_juint) \
3288 \
3289 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3290 "Delay between expansion and allocation (in milliseconds)") \
3291 \
3292 develop(uintx, GCWorkerDelayMillis, 0, \
3293 "Delay in scheduling GC workers (in milliseconds)") \
3294 \
3295 product(intx, DeferThrSuspendLoopCount, 4000, \
3296 "(Unstable) Number of times to iterate in safepoint loop " \
3297 "before blocking VM threads ") \
3298 range(-1, max_jint-1) \
3299 \
3300 product(intx, DeferPollingPageLoopCount, -1, \
3301 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3302 "before changing safepoint polling page to RO ") \
3303 range(-1, max_jint-1) \
3304 \
3305 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3306 range(0, max_intx) \
3307 \
3308 product(bool, PSChunkLargeArrays, true, \
3309 "Process large arrays in chunks") \
3310 \
3311 product(uintx, GCDrainStackTargetSize, 64, \
3312 "Number of entries we will try to leave on the stack " \
3313 "during parallel gc") \
3314 range(0, max_juint) \
3315 \
3316 /* stack parameters */ \
3317 product_pd(intx, StackYellowPages, \
3318 "Number of yellow zone (recoverable overflows) pages of size " \
3319 "4KB. If pages are bigger yellow zone is aligned up.") \
3320 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3321 \
3322 product_pd(intx, StackRedPages, \
3323 "Number of red zone (unrecoverable overflows) pages of size " \
3324 "4KB. If pages are bigger red zone is aligned up.") \
3325 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3326 \
3327 product_pd(intx, StackReservedPages, \
3328 "Number of reserved zone (reserved to annotated methods) pages" \
3329 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3330 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3331 \
3332 product(bool, RestrictReservedStack, true, \
3333 "Restrict @ReservedStackAccess to trusted classes") \
3334 \
3335 /* greater stack shadow pages can't generate instruction to bang stack */ \
3336 product_pd(intx, StackShadowPages, \
3337 "Number of shadow zone (for overflow checking) pages of size " \
3338 "4KB. If pages are bigger shadow zone is aligned up. " \
3339 "This should exceed the depth of the VM and native call stack.") \
3340 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3341 \
3342 product_pd(intx, ThreadStackSize, \
3343 "Thread Stack Size (in Kbytes)") \
3344 range(0, 1 * M) \
3345 \
3346 product_pd(intx, VMThreadStackSize, \
3347 "Non-Java Thread Stack Size (in Kbytes)") \
3348 range(0, max_intx/(1 * K)) \
3349 \
3350 product_pd(intx, CompilerThreadStackSize, \
3351 "Compiler Thread Stack Size (in Kbytes)") \
3352 range(0, max_intx/(1 * K)) \
3353 \
3354 develop_pd(size_t, JVMInvokeMethodSlack, \
3355 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3356 \
3357 /* code cache parameters */ \
3358 develop_pd(uintx, CodeCacheSegmentSize, \
3359 "Code cache segment size (in bytes) - smallest unit of " \
3360 "allocation") \
3361 range(1, 1024) \
3362 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3363 \
3364 develop_pd(intx, CodeEntryAlignment, \
3365 "Code entry alignment for generated code (in bytes)") \
3366 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3367 \
3368 product_pd(intx, OptoLoopAlignment, \
3369 "Align inner loops to zero relative to this modulus") \
3370 range(1, 16) \
3371 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3372 \
3373 product_pd(uintx, InitialCodeCacheSize, \
3374 "Initial code cache size (in bytes)") \
3375 range(0, max_uintx) \
3376 \
3377 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3378 "Minimum code cache size (in bytes) required to start VM.") \
3379 range(0, max_uintx) \
3380 \
3381 product(bool, SegmentedCodeCache, false, \
3382 "Use a segmented code cache") \
3383 \
3384 product_pd(uintx, ReservedCodeCacheSize, \
3385 "Reserved code cache size (in bytes) - maximum code cache size") \
3386 range(0, max_uintx) \
3387 \
3388 product_pd(uintx, NonProfiledCodeHeapSize, \
3389 "Size of code heap with non-profiled methods (in bytes)") \
3390 range(0, max_uintx) \
3391 \
3392 product_pd(uintx, ProfiledCodeHeapSize, \
3393 "Size of code heap with profiled methods (in bytes)") \
3394 range(0, max_uintx) \
3395 \
3396 product_pd(uintx, NonNMethodCodeHeapSize, \
3397 "Size of code heap with non-nmethods (in bytes)") \
3398 range(0, max_uintx) \
3399 \
3400 product_pd(uintx, CodeCacheExpansionSize, \
3401 "Code cache expansion size (in bytes)") \
3402 range(0, max_uintx) \
3403 \
3404 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
3405 "Minimum number of segments in a code cache block") \
3406 range(1, 100) \
3407 \
3408 notproduct(bool, ExitOnFullCodeCache, false, \
3409 "Exit the VM if we fill the code cache") \
3410 \
3411 product(bool, UseCodeCacheFlushing, true, \
3412 "Remove cold/old nmethods from the code cache") \
3413 \
3414 product(uintx, StartAggressiveSweepingAt, 10, \
3415 "Start aggressive sweeping if X[%] of the code cache is free." \
3416 "Segmented code cache: X[%] of the non-profiled heap." \
3417 "Non-segmented code cache: X[%] of the total code cache") \
3418 range(0, 100) \
3419 \
3420 /* AOT parameters */ \
3421 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \
3422 "Use AOT compiled files") \
3423 \
3424 product(ccstrlist, AOTLibrary, NULL, \
3425 "AOT library") \
3426 \
3427 product(bool, PrintAOT, false, \
3428 "Print used AOT klasses and methods") \
3429 \
3430 notproduct(bool, PrintAOTStatistics, false, \
3431 "Print AOT statistics") \
3432 \
3433 diagnostic(bool, UseAOTStrictLoading, false, \
3434 "Exit the VM if any of the AOT libraries has invalid config") \
3435 \
3436 product(bool, CalculateClassFingerprint, false, \
3437 "Calculate class fingerprint") \
3438 \
3439 /* interpreter debugging */ \
3440 develop(intx, BinarySwitchThreshold, 5, \
3441 "Minimal number of lookupswitch entries for rewriting to binary " \
3442 "switch") \
3443 \
3444 develop(intx, StopInterpreterAt, 0, \
3445 "Stop interpreter execution at specified bytecode number") \
3446 \
3447 develop(intx, TraceBytecodesAt, 0, \
3448 "Trace bytecodes starting with specified bytecode number") \
3449 \
3450 /* compiler interface */ \
3451 develop(intx, CIStart, 0, \
3452 "The id of the first compilation to permit") \
3453 \
3454 develop(intx, CIStop, max_jint, \
3455 "The id of the last compilation to permit") \
3456 \
3457 develop(intx, CIStartOSR, 0, \
3458 "The id of the first osr compilation to permit " \
3459 "(CICountOSR must be on)") \
3460 \
3461 develop(intx, CIStopOSR, max_jint, \
3462 "The id of the last osr compilation to permit " \
3463 "(CICountOSR must be on)") \
3464 \
3465 develop(intx, CIBreakAtOSR, -1, \
3466 "The id of osr compilation to break at") \
3467 \
3468 develop(intx, CIBreakAt, -1, \
3469 "The id of compilation to break at") \
3470 \
3471 product(ccstrlist, CompileOnly, "", \
3472 "List of methods (pkg/class.name) to restrict compilation to") \
3473 \
3474 product(ccstr, CompileCommandFile, NULL, \
3475 "Read compiler commands from this file [.hotspot_compiler]") \
3476 \
3477 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3478 "Read compiler directives from this file") \
3479 \
3480 product(ccstrlist, CompileCommand, "", \
3481 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3482 \
3483 develop(bool, ReplayCompiles, false, \
3484 "Enable replay of compilations from ReplayDataFile") \
3485 \
3486 product(ccstr, ReplayDataFile, NULL, \
3487 "File containing compilation replay information" \
3488 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3489 \
3490 product(ccstr, InlineDataFile, NULL, \
3491 "File containing inlining replay information" \
3492 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3493 \
3494 develop(intx, ReplaySuppressInitializers, 2, \
3495 "Control handling of class initialization during replay: " \
3496 "0 - don't do anything special; " \
3497 "1 - treat all class initializers as empty; " \
3498 "2 - treat class initializers for application classes as empty; " \
3499 "3 - allow all class initializers to run during bootstrap but " \
3500 " pretend they are empty after starting replay") \
3501 range(0, 3) \
3502 \
3503 develop(bool, ReplayIgnoreInitErrors, false, \
3504 "Ignore exceptions thrown during initialization for replay") \
3505 \
3506 product(bool, DumpReplayDataOnError, true, \
3507 "Record replay data for crashing compiler threads") \
3508 \
3509 product(bool, CICompilerCountPerCPU, false, \
3510 "1 compiler thread for log(N CPUs)") \
3511 \
3512 develop(intx, CIFireOOMAt, -1, \
3513 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3514 "(non-negative value throws OOM after this many CI accesses " \
3515 "in each compile)") \
3516 notproduct(intx, CICrashAt, -1, \
3517 "id of compilation to trigger assert in compiler thread for " \
3518 "the purpose of testing, e.g. generation of replay data") \
3519 notproduct(bool, CIObjectFactoryVerify, false, \
3520 "enable potentially expensive verification in ciObjectFactory") \
3521 \
3522 /* Priorities */ \
3523 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3524 \
3525 product(intx, ThreadPriorityPolicy, 0, \
3526 "0 : Normal. "\
3527 " VM chooses priorities that are appropriate for normal "\
3528 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3529 " to normal native priority. Java priorities below " \
3530 " NORM_PRIORITY map to lower native priority values. On "\
3531 " Windows applications are allowed to use higher native "\
3532 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3533 " not use the highest possible native priority, "\
3534 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3535 " system threads. On Linux thread priorities are ignored "\
3536 " because the OS does not support static priority in "\
3537 " SCHED_OTHER scheduling class which is the only choice for "\
3538 " non-root, non-realtime applications. "\
3539 "1 : Aggressive. "\
3540 " Java thread priorities map over to the entire range of "\
3541 " native thread priorities. Higher Java thread priorities map "\
3542 " to higher native thread priorities. This policy should be "\
3543 " used with care, as sometimes it can cause performance "\
3544 " degradation in the application and/or the entire system. On "\
3545 " Linux this policy requires root privilege.") \
3546 range(0, 1) \
3547 \
3548 product(bool, ThreadPriorityVerbose, false, \
3549 "Print priority changes") \
3550 \
3551 product(intx, CompilerThreadPriority, -1, \
3552 "The native priority at which compiler threads should run " \
3553 "(-1 means no change)") \
3554 range(min_jint, max_jint) \
3555 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3556 \
3557 product(intx, VMThreadPriority, -1, \
3558 "The native priority at which the VM thread should run " \
3559 "(-1 means no change)") \
3560 range(-1, 127) \
3561 \
3562 product(bool, CompilerThreadHintNoPreempt, true, \
3563 "(Solaris only) Give compiler threads an extra quanta") \
3564 \
3565 product(bool, VMThreadHintNoPreempt, false, \
3566 "(Solaris only) Give VM thread an extra quanta") \
3567 \
3568 product(intx, JavaPriority1_To_OSPriority, -1, \
3569 "Map Java priorities to OS priorities") \
3570 range(-1, 127) \
3571 \
3572 product(intx, JavaPriority2_To_OSPriority, -1, \
3573 "Map Java priorities to OS priorities") \
3574 range(-1, 127) \
3575 \
3576 product(intx, JavaPriority3_To_OSPriority, -1, \
3577 "Map Java priorities to OS priorities") \
3578 range(-1, 127) \
3579 \
3580 product(intx, JavaPriority4_To_OSPriority, -1, \
3581 "Map Java priorities to OS priorities") \
3582 range(-1, 127) \
3583 \
3584 product(intx, JavaPriority5_To_OSPriority, -1, \
3585 "Map Java priorities to OS priorities") \
3586 range(-1, 127) \
3587 \
3588 product(intx, JavaPriority6_To_OSPriority, -1, \
3589 "Map Java priorities to OS priorities") \
3590 range(-1, 127) \
3591 \
3592 product(intx, JavaPriority7_To_OSPriority, -1, \
3593 "Map Java priorities to OS priorities") \
3594 range(-1, 127) \
3595 \
3596 product(intx, JavaPriority8_To_OSPriority, -1, \
3597 "Map Java priorities to OS priorities") \
3598 range(-1, 127) \
3599 \
3600 product(intx, JavaPriority9_To_OSPriority, -1, \
3601 "Map Java priorities to OS priorities") \
3602 range(-1, 127) \
3603 \
3604 product(intx, JavaPriority10_To_OSPriority,-1, \
3605 "Map Java priorities to OS priorities") \
3606 range(-1, 127) \
3607 \
3608 experimental(bool, UseCriticalJavaThreadPriority, false, \
3609 "Java thread priority 10 maps to critical scheduling priority") \
3610 \
3611 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3612 "Compiler thread(s) run at critical scheduling priority") \
3613 \
3614 experimental(bool, UseCriticalCMSThreadPriority, false, \
3615 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3616 \
3617 /* compiler debugging */ \
3618 notproduct(intx, CompileTheWorldStartAt, 1, \
3619 "First class to consider when using +CompileTheWorld") \
3620 \
3621 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3622 "Last class to consider when using +CompileTheWorld") \
3623 \
3624 develop(intx, NewCodeParameter, 0, \
3625 "Testing Only: Create a dedicated integer parameter before " \
3626 "putback") \
3627 \
3628 /* new oopmap storage allocation */ \
3629 develop(intx, MinOopMapAllocation, 8, \
3630 "Minimum number of OopMap entries in an OopMapSet") \
3631 \
3632 /* Background Compilation */ \
3633 develop(intx, LongCompileThreshold, 50, \
3634 "Used with +TraceLongCompiles") \
3635 \
3636 /* recompilation */ \
3637 product_pd(intx, CompileThreshold, \
3638 "number of interpreted method invocations before (re-)compiling") \
3639 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3640 \
3641 product(double, CompileThresholdScaling, 1.0, \
3642 "Factor to control when first compilation happens " \
3643 "(both with and without tiered compilation): " \
3644 "values greater than 1.0 delay counter overflow, " \
3645 "values between 0 and 1.0 rush counter overflow, " \
3646 "value of 1.0 leaves compilation thresholds unchanged " \
3647 "value of 0.0 is equivalent to -Xint. " \
3648 "" \
3649 "Flag can be set as per-method option. " \
3650 "If a value is specified for a method, compilation thresholds " \
3651 "for that method are scaled by both the value of the global flag "\
3652 "and the value of the per-method flag.") \
3653 range(0.0, DBL_MAX) \
3654 \
3655 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3656 "Interpreter (tier 0) invocation notification frequency") \
3657 range(0, 30) \
3658 \
3659 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3660 "C1 without MDO (tier 2) invocation notification frequency") \
3661 range(0, 30) \
3662 \
3663 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3664 "C1 with MDO profiling (tier 3) invocation notification " \
3665 "frequency") \
3666 range(0, 30) \
3667 \
3668 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3669 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3670 range(0, 30) \
3671 \
3672 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3673 "Interpreter (tier 0) invocation notification frequency") \
3674 range(0, 30) \
3675 \
3676 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3677 "C1 without MDO (tier 2) invocation notification frequency") \
3678 range(0, 30) \
3679 \
3680 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3681 "C1 with MDO profiling (tier 3) invocation notification " \
3682 "frequency") \
3683 range(0, 30) \
3684 \
3685 product(intx, Tier2CompileThreshold, 0, \
3686 "threshold at which tier 2 compilation is invoked") \
3687 range(0, max_jint) \
3688 \
3689 product(intx, Tier2BackEdgeThreshold, 0, \
3690 "Back edge threshold at which tier 2 compilation is invoked") \
3691 range(0, max_jint) \
3692 \
3693 product(intx, Tier3InvocationThreshold, 200, \
3694 "Compile if number of method invocations crosses this " \
3695 "threshold") \
3696 range(0, max_jint) \
3697 \
3698 product(intx, Tier3MinInvocationThreshold, 100, \
3699 "Minimum invocation to compile at tier 3") \
3700 range(0, max_jint) \
3701 \
3702 product(intx, Tier3CompileThreshold, 2000, \
3703 "Threshold at which tier 3 compilation is invoked (invocation " \
3704 "minimum must be satisfied)") \
3705 range(0, max_jint) \
3706 \
3707 product(intx, Tier3BackEdgeThreshold, 60000, \
3708 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3709 range(0, max_jint) \
3710 \
3711 product(intx, Tier3AOTInvocationThreshold, 10000, \
3712 "Compile if number of method invocations crosses this " \
3713 "threshold if coming from AOT") \
3714 range(0, max_jint) \
3715 \
3716 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
3717 "Minimum invocation to compile at tier 3 if coming from AOT") \
3718 range(0, max_jint) \
3719 \
3720 product(intx, Tier3AOTCompileThreshold, 15000, \
3721 "Threshold at which tier 3 compilation is invoked (invocation " \
3722 "minimum must be satisfied) if coming from AOT") \
3723 range(0, max_jint) \
3724 \
3725 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
3726 "Back edge threshold at which tier 3 OSR compilation is invoked " \
3727 "if coming from AOT") \
3728 range(0, max_jint) \
3729 \
3730 product(intx, Tier4InvocationThreshold, 5000, \
3731 "Compile if number of method invocations crosses this " \
3732 "threshold") \
3733 range(0, max_jint) \
3734 \
3735 product(intx, Tier4MinInvocationThreshold, 600, \
3736 "Minimum invocation to compile at tier 4") \
3737 range(0, max_jint) \
3738 \
3739 product(intx, Tier4CompileThreshold, 15000, \
3740 "Threshold at which tier 4 compilation is invoked (invocation " \
3741 "minimum must be satisfied") \
3742 range(0, max_jint) \
3743 \
3744 product(intx, Tier4BackEdgeThreshold, 40000, \
3745 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3746 range(0, max_jint) \
3747 \
3748 product(intx, Tier3DelayOn, 5, \
3749 "If C2 queue size grows over this amount per compiler thread " \
3750 "stop compiling at tier 3 and start compiling at tier 2") \
3751 range(0, max_jint) \
3752 \
3753 product(intx, Tier3DelayOff, 2, \
3754 "If C2 queue size is less than this amount per compiler thread " \
3755 "allow methods compiled at tier 2 transition to tier 3") \
3756 range(0, max_jint) \
3757 \
3758 product(intx, Tier3LoadFeedback, 5, \
3759 "Tier 3 thresholds will increase twofold when C1 queue size " \
3760 "reaches this amount per compiler thread") \
3761 range(0, max_jint) \
3762 \
3763 product(intx, Tier4LoadFeedback, 3, \
3764 "Tier 4 thresholds will increase twofold when C2 queue size " \
3765 "reaches this amount per compiler thread") \
3766 range(0, max_jint) \
3767 \
3768 product(intx, TieredCompileTaskTimeout, 50, \
3769 "Kill compile task if method was not used within " \
3770 "given timeout in milliseconds") \
3771 range(0, max_intx) \
3772 \
3773 product(intx, TieredStopAtLevel, 4, \
3774 "Stop at given compilation level") \
3775 range(0, 4) \
3776 \
3777 product(intx, Tier0ProfilingStartPercentage, 200, \
3778 "Start profiling in interpreter if the counters exceed tier 3 " \
3779 "thresholds by the specified percentage") \
3780 range(0, max_jint) \
3781 \
3782 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3783 "Increase the compile threshold for C1 compilation if the code " \
3784 "cache is filled by the specified percentage") \
3785 range(0, 99) \
3786 \
3787 product(intx, TieredRateUpdateMinTime, 1, \
3788 "Minimum rate sampling interval (in milliseconds)") \
3789 range(0, max_intx) \
3790 \
3791 product(intx, TieredRateUpdateMaxTime, 25, \
3792 "Maximum rate sampling interval (in milliseconds)") \
3793 range(0, max_intx) \
3794 \
3795 product_pd(bool, TieredCompilation, \
3796 "Enable tiered compilation") \
3797 \
3798 product(bool, PrintTieredEvents, false, \
3799 "Print tiered events notifications") \
3800 \
3801 product_pd(intx, OnStackReplacePercentage, \
3802 "NON_TIERED number of method invocations/branches (expressed as " \
3803 "% of CompileThreshold) before (re-)compiling OSR code") \
3804 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3805 \
3806 product(intx, InterpreterProfilePercentage, 33, \
3807 "NON_TIERED number of method invocations/branches (expressed as " \
3808 "% of CompileThreshold) before profiling in the interpreter") \
3809 range(0, 100) \
3810 \
3811 develop(intx, MaxRecompilationSearchLength, 10, \
3812 "The maximum number of frames to inspect when searching for " \
3813 "recompilee") \
3814 \
3815 develop(intx, MaxInterpretedSearchLength, 3, \
3816 "The maximum number of interpreted frames to skip when searching "\
3817 "for recompilee") \
3818 \
3819 develop(intx, DesiredMethodLimit, 8000, \
3820 "The desired maximum method size (in bytecodes) after inlining") \
3821 \
3822 develop(intx, HugeMethodLimit, 8000, \
3823 "Don't compile methods larger than this if " \
3824 "+DontCompileHugeMethods") \
3825 \
3826 /* New JDK 1.4 reflection implementation */ \
3827 \
3828 develop(intx, FastSuperclassLimit, 8, \
3829 "Depth of hardwired instanceof accelerator array") \
3830 \
3831 /* Properties for Java libraries */ \
3832 \
3833 product(uint64_t, MaxDirectMemorySize, 0, \
3834 "Maximum total size of NIO direct-buffer allocations") \
3835 range(0, max_jlong) \
3836 \
3837 /* Flags used for temporary code during development */ \
3838 \
3839 diagnostic(bool, UseNewCode, false, \
3840 "Testing Only: Use the new version while testing") \
3841 \
3842 diagnostic(bool, UseNewCode2, false, \
3843 "Testing Only: Use the new version while testing") \
3844 \
3845 diagnostic(bool, UseNewCode3, false, \
3846 "Testing Only: Use the new version while testing") \
3847 \
3848 /* flags for performance data collection */ \
3849 \
3850 product(bool, UsePerfData, true, \
3851 "Flag to disable jvmstat instrumentation for performance testing "\
3852 "and problem isolation purposes") \
3853 \
3854 product(bool, PerfDataSaveToFile, false, \
3855 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3856 \
3857 product(ccstr, PerfDataSaveFile, NULL, \
3858 "Save PerfData memory to the specified absolute pathname. " \
3859 "The string %p in the file name (if present) " \
3860 "will be replaced by pid") \
3861 \
3862 product(intx, PerfDataSamplingInterval, 50, \
3863 "Data sampling interval (in milliseconds)") \
3864 range(PeriodicTask::min_interval, max_jint) \
3865 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3866 \
3867 product(bool, PerfDisableSharedMem, false, \
3868 "Store performance data in standard memory") \
3869 \
3870 product(intx, PerfDataMemorySize, 32*K, \
3871 "Size of performance data memory region. Will be rounded " \
3872 "up to a multiple of the native os page size.") \
3873 range(128, 32*64*K) \
3874 \
3875 product(intx, PerfMaxStringConstLength, 1024, \
3876 "Maximum PerfStringConstant string length before truncation") \
3877 range(32, 32*K) \
3878 \
3879 product(bool, PerfAllowAtExitRegistration, false, \
3880 "Allow registration of atexit() methods") \
3881 \
3882 product(bool, PerfBypassFileSystemCheck, false, \
3883 "Bypass Win32 file system criteria checks (Windows Only)") \
3884 \
3885 product(intx, UnguardOnExecutionViolation, 0, \
3886 "Unguard page and retry on no-execute fault (Win32 only) " \
3887 "0=off, 1=conservative, 2=aggressive") \
3888 range(0, 2) \
3889 \
3890 /* Serviceability Support */ \
3891 \
3892 product(bool, ManagementServer, false, \
3893 "Create JMX Management Server") \
3894 \
3895 product(bool, DisableAttachMechanism, false, \
3896 "Disable mechanism that allows tools to attach to this VM") \
3897 \
3898 product(bool, StartAttachListener, false, \
3899 "Always start Attach Listener at VM startup") \
3900 \
3901 product(bool, EnableDynamicAgentLoading, true, \
3902 "Allow tools to load agents with the attach mechanism") \
3903 \
3904 manageable(bool, PrintConcurrentLocks, false, \
3905 "Print java.util.concurrent locks in thread dump") \
3906 \
3907 product(bool, TransmitErrorReport, false, \
3908 "Enable error report transmission on erroneous termination") \
3909 \
3910 product(ccstr, ErrorReportServer, NULL, \
3911 "Override built-in error report server address") \
3912 \
3913 /* Shared spaces */ \
3914 \
3915 product(bool, UseSharedSpaces, true, \
3916 "Use shared spaces for metadata") \
3917 \
3918 product(bool, VerifySharedSpaces, false, \
3919 "Verify shared spaces (false for default archive, true for " \
3920 "archive specified by -XX:SharedArchiveFile)") \
3921 \
3922 product(bool, RequireSharedSpaces, false, \
3923 "Require shared spaces for metadata") \
3924 \
3925 product(bool, DumpSharedSpaces, false, \
3926 "Special mode: JVM reads a class list, loads classes, builds " \
3927 "shared spaces, and dumps the shared spaces to a file to be " \
3928 "used in future JVM runs") \
3929 \
3930 product(bool, PrintSharedArchiveAndExit, false, \
3931 "Print shared archive file contents") \
3932 \
3933 product(bool, PrintSharedDictionary, false, \
3934 "If PrintSharedArchiveAndExit is true, also print the shared " \
3935 "dictionary") \
3936 \
3937 product(size_t, SharedReadWriteSize, 0, \
3938 "Deprecated") \
3939 \
3940 product(size_t, SharedReadOnlySize, 0, \
3941 "Deprecated") \
3942 \
3943 product(size_t, SharedMiscDataSize, 0, \
3944 "Deprecated") \
3945 \
3946 product(size_t, SharedMiscCodeSize, 0, \
3947 "Deprecated") \
3948 \
3949 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
3950 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3951 "Address to allocate shared memory region for class data") \
3952 range(0, SIZE_MAX) \
3953 \
3954 product(uintx, SharedSymbolTableBucketSize, 4, \
3955 "Average number of symbols per bucket in shared table") \
3956 range(2, 246) \
3957 \
3958 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
3959 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3960 "classes. Just exclude them from the shared dictionary.") \
3961 \
3962 diagnostic(bool, PrintMethodHandleStubs, false, \
3963 "Print generated stub code for method handles") \
3964 \
3965 develop(bool, TraceMethodHandles, false, \
3966 "trace internal method handle operations") \
3967 \
3968 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3969 "perform extra checks when constructing method handles") \
3970 \
3971 diagnostic(bool, ShowHiddenFrames, false, \
3972 "show method handle implementation frames (usually hidden)") \
3973 \
3974 experimental(bool, TrustFinalNonStaticFields, false, \
3975 "trust final non-static declarations for constant folding") \
3976 \
3977 diagnostic(bool, FoldStableValues, true, \
3978 "Optimize loads from stable fields (marked w/ @Stable)") \
3979 \
3980 develop(bool, TraceInvokeDynamic, false, \
3981 "trace internal invoke dynamic operations") \
3982 \
3983 diagnostic(bool, PauseAtStartup, false, \
3984 "Causes the VM to pause at startup time and wait for the pause " \
3985 "file to be removed (default: ./vm.paused.<pid>)") \
3986 \
3987 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3988 "The file to create and for whose removal to await when pausing " \
3989 "at startup. (default: ./vm.paused.<pid>)") \
3990 \
3991 diagnostic(bool, PauseAtExit, false, \
3992 "Pause and wait for keypress on exit if a debugger is attached") \
3993 \
3994 product(bool, ExtendedDTraceProbes, false, \
3995 "Enable performance-impacting dtrace probes") \
3996 \
3997 product(bool, DTraceMethodProbes, false, \
3998 "Enable dtrace probes for method-entry and method-exit") \
3999 \
4000 product(bool, DTraceAllocProbes, false, \
4001 "Enable dtrace probes for object allocation") \
4002 \
4003 product(bool, DTraceMonitorProbes, false, \
4004 "Enable dtrace probes for monitor events") \
4005 \
4006 product(bool, RelaxAccessControlCheck, false, \
4007 "Relax the access control checks in the verifier") \
4008 \
4009 product(uintx, StringTableSize, defaultStringTableSize, \
4010 "Number of buckets in the interned String table") \
4011 range(minimumStringTableSize, 111*defaultStringTableSize) \
4012 \
4013 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4014 "Number of buckets in the JVM internal Symbol table") \
4015 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4016 \
4017 product(bool, UseStringDeduplication, false, \
4018 "Use string deduplication") \
4019 \
4020 product(uintx, StringDeduplicationAgeThreshold, 3, \
4021 "A string must reach this age (or be promoted to an old region) " \
4022 "to be considered for deduplication") \
4023 range(1, markOopDesc::max_age) \
4024 \
4025 diagnostic(bool, StringDeduplicationResizeALot, false, \
4026 "Force table resize every time the table is scanned") \
4027 \
4028 diagnostic(bool, StringDeduplicationRehashALot, false, \
4029 "Force table rehash every time the table is scanned") \
4030 \
4031 diagnostic(bool, WhiteBoxAPI, false, \
4032 "Enable internal testing APIs") \
4033 \
4034 experimental(intx, SurvivorAlignmentInBytes, 0, \
4035 "Default survivor space alignment in bytes") \
4036 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4037 \
4038 product(bool , AllowNonVirtualCalls, false, \
4039 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4040 \
4041 product(ccstr, DumpLoadedClassList, NULL, \
4042 "Dump the names all loaded classes, that could be stored into " \
4043 "the CDS archive, in the specified file") \
4044 \
4045 product(ccstr, SharedClassListFile, NULL, \
4046 "Override the default CDS class list") \
4047 \
4048 diagnostic(ccstr, SharedArchiveFile, NULL, \
4049 "Override the default location of the CDS archive file") \
4050 \
4051 product(ccstr, ExtraSharedClassListFile, NULL, \
4052 "Extra classlist for building the CDS archive file") \
4053 \
4054 experimental(size_t, ArrayAllocatorMallocLimit, \
4055 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4056 "Allocation less than this value will be allocated " \
4057 "using malloc. Larger allocations will use mmap.") \
4058 \
4059 experimental(bool, AlwaysAtomicAccesses, false, \
4060 "Accesses to all variables should always be atomic") \
4061 \
4062 product(bool, EnableTracing, false, \
4063 "Enable event-based tracing") \
4064 \
4065 product(bool, UseLockedTracing, false, \
4066 "Use locked-tracing when doing event-based tracing") \
4067 \
4068 diagnostic(bool, UseUnalignedAccesses, false, \
4069 "Use unaligned memory accesses in Unsafe") \
4070 \
4071 product_pd(bool, PreserveFramePointer, \
4072 "Use the FP register for holding the frame pointer " \
4073 "and not as a general purpose register.") \
4074 \
4075 diagnostic(bool, CheckIntrinsics, true, \
4076 "When a class C is loaded, check that " \
4077 "(1) all intrinsics defined by the VM for class C are present "\
4078 "in the loaded class file and are marked with the " \
4079 "@HotSpotIntrinsicCandidate annotation, that " \
4080 "(2) there is an intrinsic registered for all loaded methods " \
4081 "that are annotated with the @HotSpotIntrinsicCandidate " \
4082 "annotation, and that " \
4083 "(3) no orphan methods exist for class C (i.e., methods for " \
4084 "which the VM declares an intrinsic but that are not declared "\
4085 "in the loaded class C. " \
4086 "Check (3) is available only in debug builds.") \
4087 \
4088 diagnostic_pd(intx, InitArrayShortSize, \
4089 "Threshold small size (in bytes) for clearing arrays. " \
4090 "Anything this size or smaller may get converted to discrete " \
4091 "scalar stores.") \
4092 range(0, max_intx) \
4093 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
4094 \
4095 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4096 "Disable backwards compatibility for compile commands.") \
4097 \
4098 diagnostic(bool, CompilerDirectivesPrint, false, \
4099 "Print compiler directives on installation.") \
4100 diagnostic(int, CompilerDirectivesLimit, 50, \
4101 "Limit on number of compiler directives.") \
4102 \
4103 product(bool, EnableValhalla, false, \
4104 "Enable experimental Valhalla features") \
4105 \
4106 product(bool, EnableMVT, false, \
4107 "Enable experimental Minimal Value Types") \
4108 \
4109 product_pd(bool, ValueTypePassFieldsAsArgs, \
4110 "Pass each value type field as an argument at calls") \
4111 \
4112 product_pd(bool, ValueTypeReturnedAsFields, \
4113 "return fields instead of a value type reference") \
4114 \
4115 product(size_t, BigValueTypeThreshold, 4 * BytesPerLong, \
4116 "Max value type size for buffering") \
4117 \
4118 product(intx, ValueTypesBufferMaxMemory, 0, \
4119 "Max memory used for value types buffers (in pages)") \
4120 \
4121 product(bool, ValueTypesThreadLocalRecycling, true, \
4122 "Enable Thread local recycling of buffered values") \
4123 \
4124 product(bool, ReportVTBufferRecyclingTimes, false, \
4125 "Print duration of each VBuffer recycling") \
4126 \
4127 product(int, MinimumVTBufferChunkPerFrame, 2, \
4128 "Minimum number of VT buffer chunk allowed per frame") \
4129 \
4130 develop(bool, StressValueTypeReturnedAsFields, false, \
4131 "stress return of fields instead of a value type reference") \
4132
4133
4134
4135
4136 /*
4137 * Macros for factoring of globals
4138 */
4139
4140 // Interface macros
4141 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4142 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4143 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4144 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
4145 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4146 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4147 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4148 #ifdef PRODUCT
4149 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4150 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4151 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4152 #else
4153 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4154 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4155 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4156 #endif // PRODUCT
4157 // Special LP64 flags, product only needed for now.
4158 #ifdef _LP64
4159 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4160 #else
4161 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4162 #endif // _LP64
4163
4164 // Implementation macros
4165 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4166 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4167 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4168 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name;
4169 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4170 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4171 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4172 #ifdef PRODUCT
4173 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4174 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4175 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4176 #else
4177 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4178 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4179 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4180 #endif // PRODUCT
4181 #ifdef _LP64
4182 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4183 #else
4184 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4185 #endif // _LP64
4186
4187 // Only materialize src code for range checking when required, ignore otherwise
4188 #define IGNORE_RANGE(a, b)
4189 // Only materialize src code for contraint checking when required, ignore otherwise
4190 #define IGNORE_CONSTRAINT(func,type)
4191
4192 #define IGNORE_WRITEABLE(type)
4193
4194 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4195 DECLARE_PD_DEVELOPER_FLAG, \
4196 DECLARE_PRODUCT_FLAG, \
4197 DECLARE_PD_PRODUCT_FLAG, \
4198 DECLARE_DIAGNOSTIC_FLAG, \
4199 DECLARE_PD_DIAGNOSTIC_FLAG, \
4200 DECLARE_EXPERIMENTAL_FLAG, \
4201 DECLARE_NOTPRODUCT_FLAG, \
4202 DECLARE_MANAGEABLE_FLAG, \
4203 DECLARE_PRODUCT_RW_FLAG, \
4204 DECLARE_LP64_PRODUCT_FLAG, \
4205 IGNORE_RANGE, \
4206 IGNORE_CONSTRAINT, \
4207 IGNORE_WRITEABLE)
4208
4209 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4210 DECLARE_PD_DEVELOPER_FLAG, \
4211 DECLARE_PRODUCT_FLAG, \
4212 DECLARE_PD_PRODUCT_FLAG, \
4213 DECLARE_DIAGNOSTIC_FLAG, \
4214 DECLARE_PD_DIAGNOSTIC_FLAG, \
4215 DECLARE_NOTPRODUCT_FLAG, \
4216 IGNORE_RANGE, \
4217 IGNORE_CONSTRAINT, \
4218 IGNORE_WRITEABLE)
4219
4220 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4221 DECLARE_PRODUCT_FLAG, \
4222 DECLARE_DIAGNOSTIC_FLAG, \
4223 DECLARE_EXPERIMENTAL_FLAG, \
4224 DECLARE_NOTPRODUCT_FLAG, \
4225 IGNORE_RANGE, \
4226 IGNORE_CONSTRAINT, \
4227 IGNORE_WRITEABLE)
4228
4229 // Extensions
4230
4231 #include "runtime/globals_ext.hpp"
4232
4233 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP