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