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
67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
68 define_pd_global(bool, BackgroundCompilation, false);
69 define_pd_global(bool, UseTLAB, false);
70 define_pd_global(bool, CICompileOSR, false);
71 define_pd_global(bool, UseTypeProfile, false);
72 define_pd_global(bool, UseOnStackReplacement, false);
73 define_pd_global(bool, InlineIntrinsics, false);
74 define_pd_global(bool, PreferInterpreterNativeStubs, true);
75 define_pd_global(bool, ProfileInterpreter, false);
76 define_pd_global(bool, ProfileTraps, false);
77 define_pd_global(bool, TieredCompilation, false);
78
79 define_pd_global(intx, CompileThreshold, 0);
80
81 define_pd_global(intx, OnStackReplacePercentage, 0);
82 define_pd_global(bool, ResizeTLAB, false);
83 define_pd_global(intx, FreqInlineSize, 0);
84 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
85 define_pd_global(intx, InlineClassNatives, true);
86 define_pd_global(intx, InlineUnsafeOps, true);
87 define_pd_global(intx, InitialCodeCacheSize, 160*K);
88 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
89 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
90 define_pd_global(intx, ProfiledCodeHeapSize, 0);
91 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
92
93 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
94 define_pd_global(intx, CodeCacheMinBlockLength, 1);
95 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
96 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
97 define_pd_global(bool, NeverActAsServerClassMachine, true);
98 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
99 #define CI_COMPILER_COUNT 0
100 #else
101
102 #if COMPILER2_OR_JVMCI
103 #define CI_COMPILER_COUNT 2
104 #else
105 #define CI_COMPILER_COUNT 1
106 #endif // COMPILER2_OR_JVMCI
107
108 #endif // no compilers
109
110 // string type aliases used only in this file
111 typedef const char* ccstr;
112 typedef const char* ccstrlist; // represents string arguments which accumulate
113
114 // function type that will construct default range string
115 typedef const char* (*RangeStrFunc)(void);
116
117 struct Flag {
118 enum Flags {
119 // latest value origin
120 DEFAULT = 0,
121 COMMAND_LINE = 1,
122 ENVIRON_VAR = 2,
123 CONFIG_FILE = 3,
124 MANAGEMENT = 4,
125 ERGONOMIC = 5,
126 ATTACH_ON_DEMAND = 6,
127 INTERNAL = 7,
128
129 LAST_VALUE_ORIGIN = INTERNAL,
130 VALUE_ORIGIN_BITS = 4,
131 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
132
133 // flag kind
134 KIND_PRODUCT = 1 << 4,
135 KIND_MANAGEABLE = 1 << 5,
136 KIND_DIAGNOSTIC = 1 << 6,
137 KIND_EXPERIMENTAL = 1 << 7,
138 KIND_NOT_PRODUCT = 1 << 8,
139 KIND_DEVELOP = 1 << 9,
140 KIND_PLATFORM_DEPENDENT = 1 << 10,
141 KIND_READ_WRITE = 1 << 11,
142 KIND_C1 = 1 << 12,
143 KIND_C2 = 1 << 13,
144 KIND_ARCH = 1 << 14,
145 KIND_LP64_PRODUCT = 1 << 15,
146 KIND_COMMERCIAL = 1 << 16,
147 KIND_JVMCI = 1 << 17,
148
149 // set this bit if the flag was set on the command line
150 ORIG_COMMAND_LINE = 1 << 18,
151
152 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
153 };
154
155 enum Error {
156 // no error
157 SUCCESS = 0,
158 // flag name is missing
159 MISSING_NAME,
160 // flag value is missing
161 MISSING_VALUE,
162 // error parsing the textual form of the value
163 WRONG_FORMAT,
164 // flag is not writable
165 NON_WRITABLE,
166 // flag value is outside of its bounds
167 OUT_OF_BOUNDS,
168 // flag value violates its constraint
169 VIOLATES_CONSTRAINT,
170 // there is no flag with the given name
171 INVALID_FLAG,
172 // the flag can only be set only on command line during invocation of the VM
173 COMMAND_LINE_ONLY,
174 // the flag may only be set once
175 SET_ONLY_ONCE,
176 // the flag is not writable in this combination of product/debug build
177 CONSTANT,
178 // other, unspecified error related to setting the flag
179 ERR_OTHER
180 };
181
182 enum MsgType {
183 NONE = 0,
184 DIAGNOSTIC_FLAG_BUT_LOCKED,
185 EXPERIMENTAL_FLAG_BUT_LOCKED,
186 DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
187 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
188 };
189
190 const char* _type;
191 const char* _name;
192 void* _addr;
193 NOT_PRODUCT(const char* _doc;)
194 Flags _flags;
195 size_t _name_len;
196
197 // points to all Flags static array
198 static Flag* flags;
199
200 // number of flags
201 static size_t numFlags;
202
203 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
204 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
205 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
206
207 static const char* get_int_default_range_str();
208 static const char* get_uint_default_range_str();
209 static const char* get_intx_default_range_str();
210 static const char* get_uintx_default_range_str();
211 static const char* get_uint64_t_default_range_str();
212 static const char* get_size_t_default_range_str();
213 static const char* get_double_default_range_str();
214
215 Flag::Error check_writable(bool changed);
216
217 bool is_bool() const;
218 bool get_bool() const;
219 Flag::Error set_bool(bool value);
220
221 bool is_int() const;
222 int get_int() const;
223 Flag::Error set_int(int value);
224
225 bool is_uint() const;
226 uint get_uint() const;
227 Flag::Error set_uint(uint value);
228
229 bool is_intx() const;
230 intx get_intx() const;
231 Flag::Error set_intx(intx value);
232
233 bool is_uintx() const;
234 uintx get_uintx() const;
235 Flag::Error set_uintx(uintx value);
236
237 bool is_uint64_t() const;
238 uint64_t get_uint64_t() const;
239 Flag::Error set_uint64_t(uint64_t value);
240
241 bool is_size_t() const;
242 size_t get_size_t() const;
243 Flag::Error set_size_t(size_t value);
244
245 bool is_double() const;
246 double get_double() const;
247 Flag::Error set_double(double value);
248
249 bool is_ccstr() const;
250 bool ccstr_accumulates() const;
251 ccstr get_ccstr() const;
252 Flag::Error set_ccstr(ccstr value);
253
254 Flags get_origin();
255 void set_origin(Flags origin);
256
257 size_t get_name_length();
258
259 bool is_default();
260 bool is_ergonomic();
261 bool is_command_line();
262 void set_command_line();
263
264 bool is_product() const;
265 bool is_manageable() const;
266 bool is_diagnostic() const;
267 bool is_experimental() const;
268 bool is_notproduct() const;
269 bool is_develop() const;
270 bool is_read_write() const;
271 bool is_commercial() const;
272
273 bool is_constant_in_binary() const;
274
275 bool is_unlocker() const;
276 bool is_unlocked() const;
277 bool is_writeable() const;
278 bool is_external() const;
279
280 bool is_unlocker_ext() const;
281 bool is_unlocked_ext() const;
282 bool is_writeable_ext() const;
283 bool is_external_ext() const;
284
285 void clear_diagnostic();
286
287 Flag::MsgType get_locked_message(char*, int) const;
288 void get_locked_message_ext(char*, int) const;
289
290 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
291 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
292 void print_kind_and_origin(outputStream* st);
293 void print_as_flag(outputStream* st);
294
295 static const char* flag_error_str(Flag::Error error);
296 };
297
298 // debug flags control various aspects of the VM and are global accessible
299
300 // use FlagSetting to temporarily change some debug flag
301 // e.g. FlagSetting fs(DebugThisAndThat, true);
302 // restored to previous value upon leaving scope
303 class FlagSetting {
304 bool val;
305 bool* flag;
306 public:
307 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
308 ~FlagSetting() { *flag = val; }
309 };
310
311
312 class CounterSetting {
313 intx* counter;
314 public:
315 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
316 ~CounterSetting() { (*counter)--; }
317 };
318
319 class IntFlagSetting {
320 int val;
321 int* flag;
322 public:
323 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
324 ~IntFlagSetting() { *flag = val; }
325 };
326
327 class UIntFlagSetting {
328 uint val;
329 uint* flag;
330 public:
331 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
332 ~UIntFlagSetting() { *flag = val; }
333 };
334
335 class UIntXFlagSetting {
336 uintx val;
337 uintx* flag;
338 public:
339 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
340 ~UIntXFlagSetting() { *flag = val; }
341 };
342
343 class DoubleFlagSetting {
344 double val;
345 double* flag;
346 public:
347 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
348 ~DoubleFlagSetting() { *flag = val; }
349 };
350
351 class SizeTFlagSetting {
352 size_t val;
353 size_t* flag;
354 public:
355 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
356 ~SizeTFlagSetting() { *flag = val; }
357 };
358
359 // Helper class for temporarily saving the value of a flag during a scope.
360 template <size_t SIZE>
361 class FlagGuard {
362 unsigned char _value[SIZE];
363 void* const _addr;
364
365 // Hide operator new, this class should only be allocated on the stack.
366 // NOTE: Cannot include memory/allocation.hpp here due to circular
367 // dependencies.
368 void* operator new(size_t size) throw();
369 void* operator new [](size_t size) throw();
370
371 public:
372 FlagGuard(void* flag_addr) : _addr(flag_addr) {
373 memcpy(_value, _addr, SIZE);
374 }
375
376 ~FlagGuard() {
377 memcpy(_addr, _value, SIZE);
378 }
379 };
380
381 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
382
383 class CommandLineFlags {
384 public:
385 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
386 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); }
387 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
388 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
389 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
390
391 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
392 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); }
393 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
394 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
395 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
396
397 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
398 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); }
399 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
400 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
401 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
402
403 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
404 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); }
405 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
406 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
407 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
408
409 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
410 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); }
411 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
412 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
413 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
414
415 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
416 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); }
417 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
418 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
419 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
420
421 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
422 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); }
423 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
424 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
425 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
426
427 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
428 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); }
429 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
430 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
431 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
432
433 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
434 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); }
435 // Contract: Flag will make private copy of the incoming value.
436 // Outgoing value is always malloc-ed, and caller MUST call free.
437 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
438 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
439
440 // Returns false if name is not a command line flag.
441 static bool wasSetOnCmdline(const char* name, bool* value);
442 static void printSetFlags(outputStream* out);
443
444 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
445 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
446
447 static void verify() PRODUCT_RETURN;
448 };
449
450 // use this for flags that are true by default in the debug version but
451 // false in the optimized version, and vice versa
452 #ifdef ASSERT
453 #define trueInDebug true
454 #define falseInDebug false
455 #else
456 #define trueInDebug false
457 #define falseInDebug true
458 #endif
459
460 // use this for flags that are true per default in the product build
461 // but false in development builds, and vice versa
462 #ifdef PRODUCT
463 #define trueInProduct true
464 #define falseInProduct false
465 #else
466 #define trueInProduct false
467 #define falseInProduct true
468 #endif
469
470 // develop flags are settable / visible only during development and are constant in the PRODUCT version
471 // product flags are always settable / visible
472 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
473
474 // A flag must be declared with one of the following types:
475 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
476 // The type "ccstr" is an alias for "const char*" and is used
477 // only in this file, because the macrology requires single-token type names.
478
479 // Note: Diagnostic options not meant for VM tuning or for product modes.
480 // They are to be used for VM quality assurance or field diagnosis
481 // of VM bugs. They are hidden so that users will not be encouraged to
482 // try them as if they were VM ordinary execution options. However, they
483 // are available in the product version of the VM. Under instruction
484 // from support engineers, VM customers can turn them on to collect
485 // diagnostic information about VM problems. To use a VM diagnostic
486 // option, you must first specify +UnlockDiagnosticVMOptions.
487 // (This master switch also affects the behavior of -Xprintflags.)
488 //
489 // experimental flags are in support of features that are not
490 // part of the officially supported product, but are available
491 // for experimenting with. They could, for example, be performance
492 // features that may not have undergone full or rigorous QA, but which may
493 // help performance in some cases and released for experimentation
494 // by the community of users and developers. This flag also allows one to
495 // be able to build a fully supported product that nonetheless also
496 // ships with some unsupported, lightly tested, experimental features.
497 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
498 // UnlockExperimentalVMOptions flag, which allows the control and
499 // modification of the experimental flags.
500 //
501 // Nota bene: neither diagnostic nor experimental options should be used casually,
502 // and they are not supported on production loads, except under explicit
503 // direction from support engineers.
504 //
505 // manageable flags are writeable external product flags.
506 // They are dynamically writeable through the JDK management interface
507 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
508 // These flags are external exported interface (see CCC). The list of
509 // manageable flags can be queried programmatically through the management
510 // interface.
511 //
512 // A flag can be made as "manageable" only if
513 // - the flag is defined in a CCC as an external exported interface.
514 // - the VM implementation supports dynamic setting of the flag.
515 // This implies that the VM must *always* query the flag variable
516 // and not reuse state related to the flag state at any given time.
517 // - you want the flag to be queried programmatically by the customers.
518 //
519 // product_rw flags are writeable internal product flags.
520 // They are like "manageable" flags but for internal/private use.
521 // The list of product_rw flags are internal/private flags which
522 // may be changed/removed in a future release. It can be set
523 // through the management interface to get/set value
524 // when the name of flag is supplied.
525 //
526 // A flag can be made as "product_rw" only if
527 // - the VM implementation supports dynamic setting of the flag.
528 // This implies that the VM must *always* query the flag variable
529 // and not reuse state related to the flag state at any given time.
530 //
531 // Note that when there is a need to support develop flags to be writeable,
532 // it can be done in the same way as product_rw.
533 //
534 // range is a macro that will expand to min and max arguments for range
535 // checking code if provided - see commandLineFlagRangeList.hpp
536 //
537 // constraint is a macro that will expand to custom function call
538 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
539 //
540 // writeable is a macro that controls if and how the value can change during the runtime
541 //
542 // writeable(Always) is optional and allows the flag to have its value changed
543 // without any limitations at any time
544 //
545 // writeable(Once) flag value's can be only set once during the lifetime of VM
546 //
547 // writeable(CommandLineOnly) flag value's can be only set from command line
548 // (multiple times allowed)
549 //
550
551
552 #define RUNTIME_FLAGS(develop, \
553 develop_pd, \
554 product, \
555 product_pd, \
556 diagnostic, \
557 diagnostic_pd, \
558 experimental, \
559 notproduct, \
560 manageable, \
561 product_rw, \
562 lp64_product, \
563 range, \
564 constraint, \
565 writeable) \
566 \
567 lp64_product(bool, UseCompressedOops, false, \
568 "Use 32-bit object references in 64-bit VM. " \
569 "lp64_product means flag is always constant in 32 bit VM") \
570 \
571 lp64_product(bool, UseCompressedClassPointers, false, \
572 "Use 32-bit class pointers in 64-bit VM. " \
573 "lp64_product means flag is always constant in 32 bit VM") \
574 \
575 notproduct(bool, CheckCompressedOops, true, \
576 "Generate checks in encoding/decoding code in debug VM") \
577 \
578 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
579 "Heap allocation steps through preferred address regions to find" \
580 " where it can allocate the heap. Number of steps to take per " \
581 "region.") \
582 range(1, max_uintx) \
583 \
584 lp64_product(intx, ObjectAlignmentInBytes, 8, \
585 "Default object alignment in bytes, 8 is minimum") \
586 range(8, 256) \
587 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
588 \
589 product(bool, AssumeMP, true, \
590 "(Deprecated) Instruct the VM to assume multiple processors are available")\
591 \
592 /* UseMembar is theoretically a temp flag used for memory barrier */ \
593 /* removal testing. It was supposed to be removed before FCS but has */ \
594 /* been re-added (see 6401008) */ \
595 product_pd(bool, UseMembar, \
596 "(Unstable) Issues membars on thread state transitions") \
597 \
598 develop(bool, CleanChunkPoolAsync, true, \
599 "Clean the chunk pool asynchronously") \
600 \
601 product_pd(bool, ThreadLocalHandshakes, \
602 "Use thread-local polls instead of global poll for safepoints.") \
603 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \
604 \
605 diagnostic(uint, HandshakeTimeout, 0, \
606 "If nonzero set a timeout in milliseconds for handshakes") \
607 \
608 experimental(bool, AlwaysSafeConstructors, false, \
609 "Force safe construction, as if all fields are final.") \
610 \
611 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
612 "Enable normal processing of flags relating to field diagnostics")\
613 \
614 experimental(bool, UnlockExperimentalVMOptions, false, \
615 "Enable normal processing of flags relating to experimental " \
616 "features") \
617 \
618 product(bool, JavaMonitorsInStackTrace, true, \
619 "Print information about Java monitor locks when the stacks are" \
620 "dumped") \
621 \
622 product_pd(bool, UseLargePages, \
623 "Use large page memory") \
624 \
625 product_pd(bool, UseLargePagesIndividualAllocation, \
626 "Allocate large pages individually for better affinity") \
627 \
628 develop(bool, LargePagesIndividualAllocationInjectError, false, \
629 "Fail large pages individual allocation") \
630 \
631 product(bool, UseLargePagesInMetaspace, false, \
632 "Use large page memory in metaspace. " \
633 "Only used if UseLargePages is enabled.") \
634 \
635 product(bool, UseNUMA, false, \
636 "Use NUMA if available") \
637 \
638 product(bool, UseNUMAInterleaving, false, \
639 "Interleave memory across NUMA nodes if available") \
640 \
641 product(size_t, NUMAInterleaveGranularity, 2*M, \
642 "Granularity to use for NUMA interleaving on Windows OS") \
643 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
644 \
645 product(bool, ForceNUMA, false, \
646 "Force NUMA optimizations on single-node/UMA systems") \
647 \
648 product(uintx, NUMAChunkResizeWeight, 20, \
649 "Percentage (0-100) used to weight the current sample when " \
650 "computing exponentially decaying average for " \
651 "AdaptiveNUMAChunkSizing") \
652 range(0, 100) \
653 \
654 product(size_t, NUMASpaceResizeRate, 1*G, \
655 "Do not reallocate more than this amount per collection") \
656 range(0, max_uintx) \
657 \
658 product(bool, UseAdaptiveNUMAChunkSizing, true, \
659 "Enable adaptive chunk sizing for NUMA") \
660 \
661 product(bool, NUMAStats, false, \
662 "Print NUMA stats in detailed heap information") \
663 \
664 product(uintx, NUMAPageScanRate, 256, \
665 "Maximum number of pages to include in the page scan procedure") \
666 range(0, max_uintx) \
667 \
668 product_pd(bool, NeedsDeoptSuspend, \
669 "True for register window machines (sparc/ia64)") \
670 \
671 product(intx, UseSSE, 99, \
672 "Highest supported SSE instructions set on x86/x64") \
673 range(0, 99) \
674 \
675 product(bool, UseAES, false, \
676 "Control whether AES instructions are used when available") \
677 \
678 product(bool, UseFMA, false, \
679 "Control whether FMA instructions are used when available") \
680 \
681 product(bool, UseSHA, false, \
682 "Control whether SHA instructions are used when available") \
683 \
684 diagnostic(bool, UseGHASHIntrinsics, false, \
685 "Use intrinsics for GHASH versions of crypto") \
686 \
687 product(size_t, LargePageSizeInBytes, 0, \
688 "Large page size (0 to let VM choose the page size)") \
689 range(0, max_uintx) \
690 \
691 product(size_t, LargePageHeapSizeThreshold, 128*M, \
692 "Use large pages if maximum heap is at least this big") \
693 range(0, max_uintx) \
694 \
695 product(bool, ForceTimeHighResolution, false, \
696 "Using high time resolution (for Win32 only)") \
697 \
698 develop(bool, TracePcPatching, false, \
699 "Trace usage of frame::patch_pc") \
700 \
701 develop(bool, TraceRelocator, false, \
702 "Trace the bytecode relocator") \
703 \
704 develop(bool, TraceLongCompiles, false, \
705 "Print out every time compilation is longer than " \
706 "a given threshold") \
707 \
708 develop(bool, SafepointALot, false, \
709 "Generate a lot of safepoints. This works with " \
710 "GuaranteedSafepointInterval") \
711 \
712 product_pd(bool, BackgroundCompilation, \
713 "A thread requesting compilation is not blocked during " \
714 "compilation") \
715 \
716 product(bool, PrintVMQWaitTime, false, \
717 "Print out the waiting time in VM operation queue") \
718 \
719 product(bool, MethodFlushing, true, \
720 "Reclamation of zombie and not-entrant methods") \
721 \
722 develop(bool, VerifyStack, false, \
723 "Verify stack of each thread when it is entering a runtime call") \
724 \
725 diagnostic(bool, ForceUnreachable, false, \
726 "Make all non code cache addresses to be unreachable by " \
727 "forcing use of 64bit literal fixups") \
728 \
729 notproduct(bool, StressDerivedPointers, false, \
730 "Force scavenge when a derived pointer is detected on stack " \
731 "after rtm call") \
732 \
733 develop(bool, TraceDerivedPointers, false, \
734 "Trace traversal of derived pointers on stack") \
735 \
736 notproduct(bool, TraceCodeBlobStacks, false, \
737 "Trace stack-walk of codeblobs") \
738 \
739 product(bool, PrintJNIResolving, false, \
740 "Used to implement -v:jni") \
741 \
742 notproduct(bool, PrintRewrites, false, \
743 "Print methods that are being rewritten") \
744 \
745 product(bool, UseInlineCaches, true, \
746 "Use Inline Caches for virtual calls ") \
747 \
748 diagnostic(bool, InlineArrayCopy, true, \
749 "Inline arraycopy native that is known to be part of " \
750 "base library DLL") \
751 \
752 diagnostic(bool, InlineObjectHash, true, \
753 "Inline Object::hashCode() native that is known to be part " \
754 "of base library DLL") \
755 \
756 diagnostic(bool, InlineNatives, true, \
757 "Inline natives that are known to be part of base library DLL") \
758 \
759 diagnostic(bool, InlineMathNatives, true, \
760 "Inline SinD, CosD, etc.") \
761 \
762 diagnostic(bool, InlineClassNatives, true, \
763 "Inline Class.isInstance, etc") \
764 \
765 diagnostic(bool, InlineThreadNatives, true, \
766 "Inline Thread.currentThread, etc") \
767 \
768 diagnostic(bool, InlineUnsafeOps, true, \
769 "Inline memory ops (native methods) from Unsafe") \
770 \
771 product(bool, CriticalJNINatives, true, \
772 "Check for critical JNI entry points") \
773 \
774 notproduct(bool, StressCriticalJNINatives, false, \
775 "Exercise register saving code in critical natives") \
776 \
777 diagnostic(bool, UseAESIntrinsics, false, \
778 "Use intrinsics for AES versions of crypto") \
779 \
780 diagnostic(bool, UseAESCTRIntrinsics, false, \
781 "Use intrinsics for the paralleled version of AES/CTR crypto") \
782 \
783 diagnostic(bool, UseSHA1Intrinsics, false, \
784 "Use intrinsics for SHA-1 crypto hash function. " \
785 "Requires that UseSHA is enabled.") \
786 \
787 diagnostic(bool, UseSHA256Intrinsics, false, \
788 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
789 "Requires that UseSHA is enabled.") \
790 \
791 diagnostic(bool, UseSHA512Intrinsics, false, \
792 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
793 "Requires that UseSHA is enabled.") \
794 \
795 diagnostic(bool, UseCRC32Intrinsics, false, \
796 "use intrinsics for java.util.zip.CRC32") \
797 \
798 diagnostic(bool, UseCRC32CIntrinsics, false, \
799 "use intrinsics for java.util.zip.CRC32C") \
800 \
801 diagnostic(bool, UseAdler32Intrinsics, false, \
802 "use intrinsics for java.util.zip.Adler32") \
803 \
804 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
805 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
806 \
807 diagnostic(ccstrlist, DisableIntrinsic, "", \
808 "do not expand intrinsics whose (internal) names appear here") \
809 \
810 develop(bool, TraceCallFixup, false, \
811 "Trace all call fixups") \
812 \
813 develop(bool, DeoptimizeALot, false, \
814 "Deoptimize at every exit from the runtime system") \
815 \
816 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
817 "A comma separated list of bcis to deoptimize at") \
818 \
819 product(bool, DeoptimizeRandom, false, \
820 "Deoptimize random frames on random exit from the runtime system")\
821 \
822 notproduct(bool, ZombieALot, false, \
823 "Create zombies (non-entrant) at exit from the runtime system") \
824 \
825 product(bool, UnlinkSymbolsALot, false, \
826 "Unlink unreferenced symbols from the symbol table at safepoints")\
827 \
828 notproduct(bool, WalkStackALot, false, \
829 "Trace stack (no print) at every exit from the runtime system") \
830 \
831 product(bool, Debugging, false, \
832 "Set when executing debug methods in debug.cpp " \
833 "(to prevent triggering assertions)") \
834 \
835 notproduct(bool, StrictSafepointChecks, trueInDebug, \
836 "Enable strict checks that safepoints cannot happen for threads " \
837 "that use NoSafepointVerifier") \
838 \
839 notproduct(bool, VerifyLastFrame, false, \
840 "Verify oops on last frame on entry to VM") \
841 \
842 product(bool, FailOverToOldVerifier, true, \
843 "Fail over to old verifier when split verifier fails") \
844 \
845 develop(bool, ShowSafepointMsgs, false, \
846 "Show message about safepoint synchronization") \
847 \
848 product(bool, SafepointTimeout, false, \
849 "Time out and warn or fail after SafepointTimeoutDelay " \
850 "milliseconds if failed to reach safepoint") \
851 \
852 develop(bool, DieOnSafepointTimeout, false, \
853 "Die upon failure to reach safepoint (see SafepointTimeout)") \
854 \
855 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
856 /* typically, at most a few retries are needed */ \
857 product(intx, SuspendRetryCount, 50, \
858 "Maximum retry count for an external suspend request") \
859 range(0, max_intx) \
860 \
861 product(intx, SuspendRetryDelay, 5, \
862 "Milliseconds to delay per retry (* current_retry_count)") \
863 range(0, max_intx) \
864 \
865 product(bool, AssertOnSuspendWaitFailure, false, \
866 "Assert/Guarantee on external suspend wait failure") \
867 \
868 product(bool, TraceSuspendWaitFailures, false, \
869 "Trace external suspend wait failures") \
870 \
871 product(bool, MaxFDLimit, true, \
872 "Bump the number of file descriptors to maximum in Solaris") \
873 \
874 diagnostic(bool, LogEvents, true, \
875 "Enable the various ring buffer event logs") \
876 \
877 diagnostic(uintx, LogEventsBufferEntries, 10, \
878 "Number of ring buffer event logs") \
879 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
880 \
881 product(bool, BytecodeVerificationRemote, true, \
882 "Enable the Java bytecode verifier for remote classes") \
883 \
884 product(bool, BytecodeVerificationLocal, false, \
885 "Enable the Java bytecode verifier for local classes") \
886 \
887 develop(bool, ForceFloatExceptions, trueInDebug, \
888 "Force exceptions on FP stack under/overflow") \
889 \
890 develop(bool, VerifyStackAtCalls, false, \
891 "Verify that the stack pointer is unchanged after calls") \
892 \
893 develop(bool, TraceJavaAssertions, false, \
894 "Trace java language assertions") \
895 \
896 notproduct(bool, CheckAssertionStatusDirectives, false, \
897 "Temporary - see javaClasses.cpp") \
898 \
899 notproduct(bool, PrintMallocFree, false, \
900 "Trace calls to C heap malloc/free allocation") \
901 \
902 notproduct(bool, VerifyCodeCache, false, \
903 "Verify code cache on memory allocation/deallocation") \
904 \
905 develop(bool, UseMallocOnly, false, \
906 "Use only malloc/free for allocation (no resource area/arena)") \
907 \
908 develop(bool, PrintMalloc, false, \
909 "Print all malloc/free calls") \
910 \
911 develop(bool, PrintMallocStatistics, false, \
912 "Print malloc/free statistics") \
913 \
914 develop(bool, ZapResourceArea, trueInDebug, \
915 "Zap freed resource/arena space with 0xABABABAB") \
916 \
917 notproduct(bool, ZapVMHandleArea, trueInDebug, \
918 "Zap freed VM handle space with 0xBCBCBCBC") \
919 \
920 develop(bool, ZapJNIHandleArea, trueInDebug, \
921 "Zap freed JNI handle space with 0xFEFEFEFE") \
922 \
923 notproduct(bool, ZapStackSegments, trueInDebug, \
924 "Zap allocated/freed stack segments with 0xFADFADED") \
925 \
926 develop(bool, ZapUnusedHeapArea, trueInDebug, \
927 "Zap unused heap space with 0xBAADBABE") \
928 \
929 develop(bool, CheckZapUnusedHeapArea, false, \
930 "Check zapping of unused heap space") \
931 \
932 develop(bool, ZapFillerObjects, trueInDebug, \
933 "Zap filler objects with 0xDEAFBABE") \
934 \
935 develop(bool, PrintVMMessages, true, \
936 "Print VM messages on console") \
937 \
938 notproduct(uintx, ErrorHandlerTest, 0, \
939 "If > 0, provokes an error after VM initialization; the value " \
940 "determines which error to provoke. See test_error_handler() " \
941 "in vmError.cpp.") \
942 \
943 notproduct(uintx, TestCrashInErrorHandler, 0, \
944 "If > 0, provokes an error inside VM error handler (a secondary " \
945 "crash). see test_error_handler() in vmError.cpp") \
946 \
947 notproduct(bool, TestSafeFetchInErrorHandler, false, \
948 "If true, tests SafeFetch inside error handler.") \
949 \
950 notproduct(bool, TestUnresponsiveErrorHandler, false, \
951 "If true, simulates an unresponsive error handler.") \
952 \
953 develop(bool, Verbose, false, \
954 "Print additional debugging information from other modes") \
955 \
956 develop(bool, PrintMiscellaneous, false, \
957 "Print uncategorized debugging information (requires +Verbose)") \
958 \
959 develop(bool, WizardMode, false, \
960 "Print much more debugging information") \
961 \
962 product(bool, ShowMessageBoxOnError, false, \
963 "Keep process alive on VM fatal error") \
964 \
965 product(bool, CreateCoredumpOnCrash, true, \
966 "Create core/mini dump on VM fatal error") \
967 \
968 product(uint64_t, ErrorLogTimeout, 2 * 60, \
969 "Timeout, in seconds, to limit the time spent on writing an " \
970 "error log in case of a crash.") \
971 range(0, (uint64_t)max_jlong/1000) \
972 \
973 product_pd(bool, UseOSErrorReporting, \
974 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
975 \
976 product(bool, SuppressFatalErrorMessage, false, \
977 "Report NO fatal error message (avoid deadlock)") \
978 \
979 product(ccstrlist, OnError, "", \
980 "Run user-defined commands on fatal error; see VMError.cpp " \
981 "for examples") \
982 \
983 product(ccstrlist, OnOutOfMemoryError, "", \
984 "Run user-defined commands on first java.lang.OutOfMemoryError") \
985 \
986 manageable(bool, HeapDumpBeforeFullGC, false, \
987 "Dump heap to file before any major stop-the-world GC") \
988 \
989 manageable(bool, HeapDumpAfterFullGC, false, \
990 "Dump heap to file after any major stop-the-world GC") \
991 \
992 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
993 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
994 \
995 manageable(ccstr, HeapDumpPath, NULL, \
996 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
997 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
998 "in the working directory)") \
999 \
1000 develop(bool, BreakAtWarning, false, \
1001 "Execute breakpoint upon encountering VM warning") \
1002 \
1003 develop(bool, UseFakeTimers, false, \
1004 "Tell whether the VM should use system time or a fake timer") \
1005 \
1006 product(ccstr, NativeMemoryTracking, "off", \
1007 "Native memory tracking options") \
1008 \
1009 diagnostic(bool, PrintNMTStatistics, false, \
1010 "Print native memory tracking summary data if it is on") \
1011 \
1012 diagnostic(bool, LogCompilation, false, \
1013 "Log compilation activity in detail to LogFile") \
1014 \
1015 product(bool, PrintCompilation, false, \
1016 "Print compilations") \
1017 \
1018 diagnostic(bool, TraceNMethodInstalls, false, \
1019 "Trace nmethod installation") \
1020 \
1021 diagnostic(intx, ScavengeRootsInCode, 2, \
1022 "0: do not allow scavengable oops in the code cache; " \
1023 "1: allow scavenging from the code cache; " \
1024 "2: emit as many constants as the compiler can see") \
1025 range(0, 2) \
1026 \
1027 product(bool, AlwaysRestoreFPU, false, \
1028 "Restore the FPU control word after every JNI call (expensive)") \
1029 \
1030 diagnostic(bool, PrintCompilation2, false, \
1031 "Print additional statistics per compilation") \
1032 \
1033 diagnostic(bool, PrintAdapterHandlers, false, \
1034 "Print code generated for i2c/c2i adapters") \
1035 \
1036 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1037 "Verify that i2c/c2i adapters are called properly") \
1038 \
1039 develop(bool, VerifyAdapterSharing, false, \
1040 "Verify that the code for shared adapters is the equivalent") \
1041 \
1042 diagnostic(bool, PrintAssembly, false, \
1043 "Print assembly code (using external disassembler.so)") \
1044 \
1045 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1046 "Print options string passed to disassembler.so") \
1047 \
1048 notproduct(bool, PrintNMethodStatistics, false, \
1049 "Print a summary statistic for the generated nmethods") \
1050 \
1051 diagnostic(bool, PrintNMethods, false, \
1052 "Print assembly code for nmethods when generated") \
1053 \
1054 diagnostic(bool, PrintNativeNMethods, false, \
1055 "Print assembly code for native nmethods when generated") \
1056 \
1057 develop(bool, PrintDebugInfo, false, \
1058 "Print debug information for all nmethods when generated") \
1059 \
1060 develop(bool, PrintRelocations, false, \
1061 "Print relocation information for all nmethods when generated") \
1062 \
1063 develop(bool, PrintDependencies, false, \
1064 "Print dependency information for all nmethods when generated") \
1065 \
1066 develop(bool, PrintExceptionHandlers, false, \
1067 "Print exception handler tables for all nmethods when generated") \
1068 \
1069 develop(bool, StressCompiledExceptionHandlers, false, \
1070 "Exercise compiled exception handlers") \
1071 \
1072 develop(bool, InterceptOSException, false, \
1073 "Start debugger when an implicit OS (e.g. NULL) " \
1074 "exception happens") \
1075 \
1076 product(bool, PrintCodeCache, false, \
1077 "Print the code cache memory usage when exiting") \
1078 \
1079 develop(bool, PrintCodeCache2, false, \
1080 "Print detailed usage information on the code cache when exiting")\
1081 \
1082 product(bool, PrintCodeCacheOnCompilation, false, \
1083 "Print the code cache memory usage each time a method is " \
1084 "compiled") \
1085 \
1086 diagnostic(bool, PrintStubCode, false, \
1087 "Print generated stub code") \
1088 \
1089 product(bool, StackTraceInThrowable, true, \
1090 "Collect backtrace in throwable when exception happens") \
1091 \
1092 product(bool, OmitStackTraceInFastThrow, true, \
1093 "Omit backtraces for some 'hot' exceptions in optimized code") \
1094 \
1095 product(bool, ProfilerPrintByteCodeStatistics, false, \
1096 "Print bytecode statistics when dumping profiler output") \
1097 \
1098 product(bool, ProfilerRecordPC, false, \
1099 "Collect ticks for each 16 byte interval of compiled code") \
1100 \
1101 product(bool, ProfileVM, false, \
1102 "Profile ticks that fall within VM (either in the VM Thread " \
1103 "or VM code called through stubs)") \
1104 \
1105 product(bool, ProfileIntervals, false, \
1106 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1107 \
1108 notproduct(bool, ProfilerCheckIntervals, false, \
1109 "Collect and print information on spacing of profiler ticks") \
1110 \
1111 product(bool, PrintWarnings, true, \
1112 "Print JVM warnings to output stream") \
1113 \
1114 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1115 "Print warnings for stalled SpinLocks") \
1116 \
1117 product(bool, RegisterFinalizersAtInit, true, \
1118 "Register finalizable objects at end of Object.<init> or " \
1119 "after allocation") \
1120 \
1121 develop(bool, RegisterReferences, true, \
1122 "Tell whether the VM should register soft/weak/final/phantom " \
1123 "references") \
1124 \
1125 develop(bool, IgnoreRewrites, false, \
1126 "Suppress rewrites of bytecodes in the oopmap generator. " \
1127 "This is unsafe!") \
1128 \
1129 develop(bool, PrintCodeCacheExtension, false, \
1130 "Print extension of code cache") \
1131 \
1132 develop(bool, UsePrivilegedStack, true, \
1133 "Enable the security JVM functions") \
1134 \
1135 develop(bool, ProtectionDomainVerification, true, \
1136 "Verify protection domain before resolution in system dictionary")\
1137 \
1138 product(bool, ClassUnloading, true, \
1139 "Do unloading of classes") \
1140 \
1141 product(bool, ClassUnloadingWithConcurrentMark, true, \
1142 "Do unloading of classes with a concurrent marking cycle") \
1143 \
1144 develop(bool, DisableStartThread, false, \
1145 "Disable starting of additional Java threads " \
1146 "(for debugging only)") \
1147 \
1148 develop(bool, MemProfiling, false, \
1149 "Write memory usage profiling to log file") \
1150 \
1151 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1152 "Print the system dictionary at exit") \
1153 \
1154 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \
1155 "Dynamically resize system dictionaries as needed") \
1156 \
1157 diagnostic(bool, UnsyncloadClass, false, \
1158 "Unstable: VM calls loadClass unsynchronized. Custom " \
1159 "class loader must call VM synchronized for findClass " \
1160 "and defineClass.") \
1161 \
1162 product(bool, AlwaysLockClassLoader, false, \
1163 "Require the VM to acquire the class loader lock before calling " \
1164 "loadClass() even for class loaders registering " \
1165 "as parallel capable") \
1166 \
1167 product(bool, AllowParallelDefineClass, false, \
1168 "Allow parallel defineClass requests for class loaders " \
1169 "registering as parallel capable") \
1170 \
1171 product(bool, MustCallLoadClassInternal, false, \
1172 "Call loadClassInternal() rather than loadClass()") \
1173 \
1174 product_pd(bool, DontYieldALot, \
1175 "Throw away obvious excess yield calls") \
1176 \
1177 develop(bool, UseDetachedThreads, true, \
1178 "Use detached threads that are recycled upon termination " \
1179 "(for Solaris only)") \
1180 \
1181 product(bool, UseLWPSynchronization, true, \
1182 "Use LWP-based instead of libthread-based synchronization " \
1183 "(SPARC only)") \
1184 \
1185 experimental(ccstr, SyncKnobs, NULL, \
1186 "(Unstable) Various monitor synchronization tunables") \
1187 \
1188 experimental(intx, EmitSync, 0, \
1189 "(Unsafe, Unstable) " \
1190 "Control emission of inline sync fast-path code") \
1191 \
1192 product(intx, MonitorBound, 0, "Bound Monitor population") \
1193 range(0, max_jint) \
1194 \
1195 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \
1196 \
1197 experimental(intx, MonitorUsedDeflationThreshold, 90, \
1198 "Percentage of used monitors before triggering cleanup " \
1199 "safepoint which deflates monitors (0 is off). " \
1200 "The check is performed on GuaranteedSafepointInterval.") \
1201 range(0, 100) \
1202 \
1203 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1204 "Experimental Sync flags") \
1205 \
1206 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1207 \
1208 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1209 \
1210 experimental(intx, hashCode, 5, \
1211 "(Unstable) select hashCode generation algorithm") \
1212 \
1213 product(bool, FilterSpuriousWakeups, true, \
1214 "When true prevents OS-level spurious, or premature, wakeups " \
1215 "from Object.wait (Ignored for Windows)") \
1216 \
1217 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1218 \
1219 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1220 \
1221 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1222 \
1223 develop(bool, UsePthreads, false, \
1224 "Use pthread-based instead of libthread-based synchronization " \
1225 "(SPARC only)") \
1226 \
1227 product(bool, ReduceSignalUsage, false, \
1228 "Reduce the use of OS signals in Java and/or the VM") \
1229 \
1230 develop_pd(bool, ShareVtableStubs, \
1231 "Share vtable stubs (smaller code but worse branch prediction") \
1232 \
1233 develop(bool, LoadLineNumberTables, true, \
1234 "Tell whether the class file parser loads line number tables") \
1235 \
1236 develop(bool, LoadLocalVariableTables, true, \
1237 "Tell whether the class file parser loads local variable tables") \
1238 \
1239 develop(bool, LoadLocalVariableTypeTables, true, \
1240 "Tell whether the class file parser loads local variable type" \
1241 "tables") \
1242 \
1243 product(bool, AllowUserSignalHandlers, false, \
1244 "Do not complain if the application installs signal handlers " \
1245 "(Solaris & Linux only)") \
1246 \
1247 product(bool, UseSignalChaining, true, \
1248 "Use signal-chaining to invoke signal handlers installed " \
1249 "by the application (Solaris & Linux only)") \
1250 \
1251 product(bool, AllowJNIEnvProxy, false, \
1252 "Allow JNIEnv proxies for jdbx") \
1253 \
1254 product(bool, RestoreMXCSROnJNICalls, false, \
1255 "Restore MXCSR when returning from JNI calls") \
1256 \
1257 product(bool, CheckJNICalls, false, \
1258 "Verify all arguments to JNI calls") \
1259 \
1260 product(bool, CheckEndorsedAndExtDirs, false, \
1261 "Verify the endorsed and extension directories are not used") \
1262 \
1263 product(bool, UseFastJNIAccessors, true, \
1264 "Use optimized versions of Get<Primitive>Field") \
1265 \
1266 product(intx, MaxJNILocalCapacity, 65536, \
1267 "Maximum allowable local JNI handle capacity to " \
1268 "EnsureLocalCapacity() and PushLocalFrame(), " \
1269 "where <= 0 is unlimited, default: 65536") \
1270 range(min_intx, max_intx) \
1271 \
1272 product(bool, EagerXrunInit, false, \
1273 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1274 "but not all -Xrun libraries may support the state of the VM " \
1275 "at this time") \
1276 \
1277 product(bool, PreserveAllAnnotations, false, \
1278 "Preserve RuntimeInvisibleAnnotations as well " \
1279 "as RuntimeVisibleAnnotations") \
1280 \
1281 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1282 "Number of OutOfMemoryErrors preallocated with backtrace") \
1283 \
1284 product(bool, UseXMMForArrayCopy, false, \
1285 "Use SSE2 MOVQ instruction for Arraycopy") \
1286 \
1287 product(intx, FieldsAllocationStyle, 1, \
1288 "0 - type based with oops first, " \
1289 "1 - with oops last, " \
1290 "2 - oops in super and sub classes are together") \
1291 range(0, 2) \
1292 \
1293 product(bool, CompactFields, true, \
1294 "Allocate nonstatic fields in gaps between previous fields") \
1295 \
1296 notproduct(bool, PrintFieldLayout, false, \
1297 "Print field layout for each class") \
1298 \
1299 /* Need to limit the extent of the padding to reasonable size. */\
1300 /* 8K is well beyond the reasonable HW cache line size, even with */\
1301 /* aggressive prefetching, while still leaving the room for segregating */\
1302 /* among the distinct pages. */\
1303 product(intx, ContendedPaddingWidth, 128, \
1304 "How many bytes to pad the fields/classes marked @Contended with")\
1305 range(0, 8192) \
1306 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
1307 \
1308 product(bool, EnableContended, true, \
1309 "Enable @Contended annotation support") \
1310 \
1311 product(bool, RestrictContended, true, \
1312 "Restrict @Contended to trusted classes") \
1313 \
1314 product(bool, UseBiasedLocking, true, \
1315 "Enable biased locking in JVM") \
1316 \
1317 product(intx, BiasedLockingStartupDelay, 0, \
1318 "Number of milliseconds to wait before enabling biased locking") \
1319 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1320 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
1321 \
1322 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1323 "Print statistics of biased locking in JVM") \
1324 \
1325 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1326 "Threshold of number of revocations per type to try to " \
1327 "rebias all objects in the heap of that type") \
1328 range(0, max_intx) \
1329 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
1330 \
1331 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1332 "Threshold of number of revocations per type to permanently " \
1333 "revoke biases of all objects in the heap of that type") \
1334 range(0, max_intx) \
1335 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
1336 \
1337 product(intx, BiasedLockingDecayTime, 25000, \
1338 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1339 "type after previous bulk rebias") \
1340 range(500, max_intx) \
1341 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
1342 \
1343 product(bool, ExitOnOutOfMemoryError, false, \
1344 "JVM exits on the first occurrence of an out-of-memory error") \
1345 \
1346 product(bool, CrashOnOutOfMemoryError, false, \
1347 "JVM aborts, producing an error log and core/mini dump, on the " \
1348 "first occurrence of an out-of-memory error") \
1349 \
1350 /* tracing */ \
1351 \
1352 develop(bool, StressRewriter, false, \
1353 "Stress linktime bytecode rewriting") \
1354 \
1355 product(ccstr, TraceJVMTI, NULL, \
1356 "Trace flags for JVMTI functions and events") \
1357 \
1358 /* This option can change an EMCP method into an obsolete method. */ \
1359 /* This can affect tests that except specific methods to be EMCP. */ \
1360 /* This option should be used with caution. */ \
1361 product(bool, StressLdcRewrite, false, \
1362 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1363 \
1364 /* change to false by default sometime after Mustang */ \
1365 product(bool, VerifyMergedCPBytecodes, true, \
1366 "Verify bytecodes after RedefineClasses constant pool merging") \
1367 \
1368 develop(bool, TraceBytecodes, false, \
1369 "Trace bytecode execution") \
1370 \
1371 develop(bool, TraceICs, false, \
1372 "Trace inline cache changes") \
1373 \
1374 notproduct(bool, TraceInvocationCounterOverflow, false, \
1375 "Trace method invocation counter overflow") \
1376 \
1377 develop(bool, TraceInlineCacheClearing, false, \
1378 "Trace clearing of inline caches in nmethods") \
1379 \
1380 develop(bool, TraceDependencies, false, \
1381 "Trace dependencies") \
1382 \
1383 develop(bool, VerifyDependencies, trueInDebug, \
1384 "Exercise and verify the compilation dependency mechanism") \
1385 \
1386 develop(bool, TraceNewOopMapGeneration, false, \
1387 "Trace OopMapGeneration") \
1388 \
1389 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1390 "Trace OopMapGeneration: print detailed cell states") \
1391 \
1392 develop(bool, TimeOopMap, false, \
1393 "Time calls to GenerateOopMap::compute_map() in sum") \
1394 \
1395 develop(bool, TimeOopMap2, false, \
1396 "Time calls to GenerateOopMap::compute_map() individually") \
1397 \
1398 develop(bool, TraceOopMapRewrites, false, \
1399 "Trace rewriting of method oops during oop map generation") \
1400 \
1401 develop(bool, TraceICBuffer, false, \
1402 "Trace usage of IC buffer") \
1403 \
1404 develop(bool, TraceCompiledIC, false, \
1405 "Trace changes of compiled IC") \
1406 \
1407 /* gc */ \
1408 \
1409 product(bool, UseSerialGC, false, \
1410 "Use the Serial garbage collector") \
1411 \
1412 product(bool, UseG1GC, false, \
1413 "Use the Garbage-First garbage collector") \
1414 \
1415 product(bool, UseParallelGC, false, \
1416 "Use the Parallel Scavenge garbage collector") \
1417 \
1418 product(bool, UseParallelOldGC, false, \
1419 "Use the Parallel Old garbage collector") \
1420 \
1421 product(uintx, HeapMaximumCompactionInterval, 20, \
1422 "How often should we maximally compact the heap (not allowing " \
1423 "any dead space)") \
1424 range(0, max_uintx) \
1425 \
1426 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1427 "The collection count for the first maximum compaction") \
1428 range(0, max_uintx) \
1429 \
1430 product(bool, UseMaximumCompactionOnSystemGC, true, \
1431 "Use maximum compaction in the Parallel Old garbage collector " \
1432 "for a system GC") \
1433 \
1434 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1435 "The mean used by the parallel compact dead wood " \
1436 "limiter (a number between 0-100)") \
1437 range(0, 100) \
1438 \
1439 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1440 "The standard deviation used by the parallel compact dead wood " \
1441 "limiter (a number between 0-100)") \
1442 range(0, 100) \
1443 \
1444 product(uint, ParallelGCThreads, 0, \
1445 "Number of parallel threads parallel gc will use") \
1446 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \
1447 \
1448 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1449 "Use semaphore synchronization for the GC Threads, " \
1450 "instead of synchronization based on mutexes") \
1451 \
1452 product(bool, UseDynamicNumberOfGCThreads, false, \
1453 "Dynamically choose the number of parallel threads " \
1454 "parallel gc will use") \
1455 \
1456 diagnostic(bool, InjectGCWorkerCreationFailure, false, \
1457 "Inject thread creation failures for " \
1458 "UseDynamicNumberOfGCThreads") \
1459 \
1460 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1461 "Force dynamic selection of the number of " \
1462 "parallel threads parallel gc will use to aid debugging") \
1463 \
1464 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1465 "Size of heap (bytes) per GC thread used in calculating the " \
1466 "number of GC threads") \
1467 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1468 \
1469 product(uint, ConcGCThreads, 0, \
1470 "Number of threads concurrent gc will use") \
1471 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \
1472 \
1473 product(uint, GCTaskTimeStampEntries, 200, \
1474 "Number of time stamp entries per gc worker thread") \
1475 range(1, max_jint) \
1476 \
1477 product(bool, AlwaysTenure, false, \
1478 "Always tenure objects in eden (ParallelGC only)") \
1479 \
1480 product(bool, NeverTenure, false, \
1481 "Never tenure objects in eden, may tenure on overflow " \
1482 "(ParallelGC only)") \
1483 \
1484 product(bool, ScavengeBeforeFullGC, true, \
1485 "Scavenge youngest generation before each full GC.") \
1486 \
1487 product(bool, UseConcMarkSweepGC, false, \
1488 "Use Concurrent Mark-Sweep GC in the old generation") \
1489 \
1490 product(bool, ExplicitGCInvokesConcurrent, false, \
1491 "A System.gc() request invokes a concurrent collection; " \
1492 "(effective only when using concurrent collectors)") \
1493 \
1494 product(bool, GCLockerInvokesConcurrent, false, \
1495 "The exit of a JNI critical section necessitating a scavenge, " \
1496 "also kicks off a background concurrent collection") \
1497 \
1498 product(uintx, GCLockerEdenExpansionPercent, 5, \
1499 "How much the GC can expand the eden by while the GC locker " \
1500 "is active (as a percentage)") \
1501 range(0, 100) \
1502 \
1503 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1504 "Number of times to retry allocations when " \
1505 "blocked by the GC locker") \
1506 range(0, max_uintx) \
1507 \
1508 product(bool, UseCMSBestFit, true, \
1509 "Use CMS best fit allocation strategy") \
1510 \
1511 product(uintx, ParallelGCBufferWastePct, 10, \
1512 "Wasted fraction of parallel allocation buffer") \
1513 range(0, 100) \
1514 \
1515 product(uintx, TargetPLABWastePct, 10, \
1516 "Target wasted space in last buffer as percent of overall " \
1517 "allocation") \
1518 range(1, 100) \
1519 \
1520 product(uintx, PLABWeight, 75, \
1521 "Percentage (0-100) used to weight the current sample when " \
1522 "computing exponentially decaying average for ResizePLAB") \
1523 range(0, 100) \
1524 \
1525 product(bool, ResizePLAB, true, \
1526 "Dynamically resize (survivor space) promotion LAB's") \
1527 \
1528 product(int, ParGCArrayScanChunk, 50, \
1529 "Scan a subset of object array and push remainder, if array is " \
1530 "bigger than this") \
1531 range(1, max_jint/3) \
1532 \
1533 product(bool, ParGCUseLocalOverflow, false, \
1534 "Instead of a global overflow list, use local overflow stacks") \
1535 \
1536 product(bool, ParGCTrimOverflow, true, \
1537 "Eagerly trim the local overflow lists " \
1538 "(when ParGCUseLocalOverflow)") \
1539 \
1540 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1541 "Simulate work queue overflow in ParNew") \
1542 \
1543 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1544 "An `interval' counter that determines how frequently " \
1545 "we simulate overflow; a smaller number increases frequency") \
1546 \
1547 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1548 "The desired number of objects to claim from the overflow list") \
1549 range(0, max_uintx) \
1550 \
1551 diagnostic(uintx, ParGCStridesPerThread, 2, \
1552 "The number of strides per worker thread that we divide up the " \
1553 "card table scanning work into") \
1554 range(1, max_uintx) \
1555 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \
1556 \
1557 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1558 "The number of cards in each chunk of the parallel chunks used " \
1559 "during card table scanning") \
1560 range(1, max_intx) \
1561 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1562 \
1563 product(uintx, OldPLABWeight, 50, \
1564 "Percentage (0-100) used to weight the current sample when " \
1565 "computing exponentially decaying average for resizing " \
1566 "OldPLABSize") \
1567 range(0, 100) \
1568 \
1569 product(bool, ResizeOldPLAB, true, \
1570 "Dynamically resize (old gen) promotion LAB's") \
1571 \
1572 product(size_t, CMSOldPLABMax, 1024, \
1573 "Maximum size of CMS gen promotion LAB caches per worker " \
1574 "per block size") \
1575 range(1, max_uintx) \
1576 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \
1577 \
1578 product(size_t, CMSOldPLABMin, 16, \
1579 "Minimum size of CMS gen promotion LAB caches per worker " \
1580 "per block size") \
1581 range(1, max_uintx) \
1582 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \
1583 \
1584 product(uintx, CMSOldPLABNumRefills, 4, \
1585 "Nominal number of refills of CMS gen promotion LAB cache " \
1586 "per worker per block size") \
1587 range(1, max_uintx) \
1588 \
1589 product(bool, CMSOldPLABResizeQuicker, false, \
1590 "React on-the-fly during a scavenge to a sudden " \
1591 "change in block demand rate") \
1592 \
1593 product(uintx, CMSOldPLABToleranceFactor, 4, \
1594 "The tolerance of the phase-change detector for on-the-fly " \
1595 "PLAB resizing during a scavenge") \
1596 range(1, max_uintx) \
1597 \
1598 product(uintx, CMSOldPLABReactivityFactor, 2, \
1599 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1600 "during a scavenge") \
1601 range(1, max_uintx) \
1602 \
1603 product(bool, AlwaysPreTouch, false, \
1604 "Force all freshly committed pages to be pre-touched") \
1605 \
1606 product(size_t, PreTouchParallelChunkSize, 1 * G, \
1607 "Per-thread chunk size for parallel memory pre-touch.") \
1608 range(1, SIZE_MAX / 2) \
1609 \
1610 product_pd(size_t, CMSYoungGenPerWorker, \
1611 "The maximum size of young gen chosen by default per GC worker " \
1612 "thread available") \
1613 range(1, max_uintx) \
1614 \
1615 product(uintx, CMSIncrementalSafetyFactor, 10, \
1616 "Percentage (0-100) used to add conservatism when computing the " \
1617 "duty cycle") \
1618 range(0, 100) \
1619 \
1620 product(uintx, CMSExpAvgFactor, 50, \
1621 "Percentage (0-100) used to weight the current sample when " \
1622 "computing exponential averages for CMS statistics") \
1623 range(0, 100) \
1624 \
1625 product(uintx, CMS_FLSWeight, 75, \
1626 "Percentage (0-100) used to weight the current sample when " \
1627 "computing exponentially decaying averages for CMS FLS " \
1628 "statistics") \
1629 range(0, 100) \
1630 \
1631 product(uintx, CMS_FLSPadding, 1, \
1632 "The multiple of deviation from mean to use for buffering " \
1633 "against volatility in free list demand") \
1634 range(0, max_juint) \
1635 \
1636 product(uintx, FLSCoalescePolicy, 2, \
1637 "CMS: aggressiveness level for coalescing, increasing " \
1638 "from 0 to 4") \
1639 range(0, 4) \
1640 \
1641 product(bool, FLSAlwaysCoalesceLarge, false, \
1642 "CMS: larger free blocks are always available for coalescing") \
1643 \
1644 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1645 "CMS: the smaller the percentage the greater the coalescing " \
1646 "force") \
1647 range(0.0, 1.0) \
1648 \
1649 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1650 "CMS: the factor by which to inflate estimated demand of small " \
1651 "block sizes to prevent coalescing with an adjoining block") \
1652 range(0.0, DBL_MAX) \
1653 \
1654 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1655 "CMS: the factor by which to inflate estimated demand of large " \
1656 "block sizes to prevent coalescing with an adjoining block") \
1657 range(0.0, DBL_MAX) \
1658 \
1659 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1660 "CMS: the factor by which to inflate estimated demand of small " \
1661 "block sizes to prevent splitting to supply demand for smaller " \
1662 "blocks") \
1663 range(0.0, DBL_MAX) \
1664 \
1665 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1666 "CMS: the factor by which to inflate estimated demand of large " \
1667 "block sizes to prevent splitting to supply demand for smaller " \
1668 "blocks") \
1669 range(0.0, DBL_MAX) \
1670 \
1671 product(bool, CMSExtrapolateSweep, false, \
1672 "CMS: cushion for block demand during sweep") \
1673 \
1674 product(uintx, CMS_SweepWeight, 75, \
1675 "Percentage (0-100) used to weight the current sample when " \
1676 "computing exponentially decaying average for inter-sweep " \
1677 "duration") \
1678 range(0, 100) \
1679 \
1680 product(uintx, CMS_SweepPadding, 1, \
1681 "The multiple of deviation from mean to use for buffering " \
1682 "against volatility in inter-sweep duration") \
1683 range(0, max_juint) \
1684 \
1685 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1686 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1687 "duration exceeds this threshold in milliseconds") \
1688 range(0, max_uintx) \
1689 \
1690 product(bool, CMSClassUnloadingEnabled, true, \
1691 "Whether class unloading enabled when using CMS GC") \
1692 \
1693 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1694 "When CMS class unloading is enabled, the maximum CMS cycle " \
1695 "count for which classes may not be unloaded") \
1696 range(0, max_uintx) \
1697 \
1698 product(uintx, CMSIndexedFreeListReplenish, 4, \
1699 "Replenish an indexed free list with this number of chunks") \
1700 range(1, max_uintx) \
1701 \
1702 product(bool, CMSReplenishIntermediate, true, \
1703 "Replenish all intermediate free-list caches") \
1704 \
1705 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1706 "When satisfying batched demand, split blocks from the " \
1707 "IndexedFreeList whose size is a multiple of requested size") \
1708 \
1709 product(bool, CMSLoopWarn, false, \
1710 "Warn in case of excessive CMS looping") \
1711 \
1712 /* where does the range max value of (max_jint - 1) come from? */ \
1713 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1714 "Maximum size of marking stack") \
1715 range(1, (max_jint - 1)) \
1716 \
1717 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1718 "Size of marking stack") \
1719 constraint(MarkStackSizeConstraintFunc,AfterErgo) \
1720 \
1721 notproduct(bool, CMSMarkStackOverflowALot, false, \
1722 "Simulate frequent marking stack / work queue overflow") \
1723 \
1724 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1725 "An \"interval\" counter that determines how frequently " \
1726 "to simulate overflow; a smaller number increases frequency") \
1727 \
1728 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1729 "Maximum number of abortable preclean iterations, if > 0") \
1730 range(0, max_uintx) \
1731 \
1732 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1733 "Maximum time in abortable preclean (in milliseconds)") \
1734 range(0, max_intx) \
1735 \
1736 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1737 "Nominal minimum work per abortable preclean iteration") \
1738 range(0, max_uintx) \
1739 \
1740 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1741 "Time that we sleep between iterations when not given " \
1742 "enough work per iteration") \
1743 range(0, max_intx) \
1744 \
1745 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \
1746 product(size_t, CMSRescanMultiple, 32, \
1747 "Size (in cards) of CMS parallel rescan task") \
1748 range(1, SIZE_MAX / 4096) \
1749 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \
1750 \
1751 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \
1752 product(size_t, CMSConcMarkMultiple, 32, \
1753 "Size (in cards) of CMS concurrent MT marking task") \
1754 range(1, SIZE_MAX / 4096) \
1755 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \
1756 \
1757 product(bool, CMSAbortSemantics, false, \
1758 "Whether abort-on-overflow semantics is implemented") \
1759 \
1760 product(bool, CMSParallelInitialMarkEnabled, true, \
1761 "Use the parallel initial mark.") \
1762 \
1763 product(bool, CMSParallelRemarkEnabled, true, \
1764 "Whether parallel remark enabled (only if ParNewGC)") \
1765 \
1766 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1767 "Whether parallel remark of survivor space " \
1768 "enabled (effective only if CMSParallelRemarkEnabled)") \
1769 \
1770 product(bool, CMSPLABRecordAlways, true, \
1771 "Always record survivor space PLAB boundaries (effective only " \
1772 "if CMSParallelSurvivorRemarkEnabled)") \
1773 \
1774 product(bool, CMSEdenChunksRecordAlways, true, \
1775 "Always record eden chunks used for the parallel initial mark " \
1776 "or remark of eden") \
1777 \
1778 product(bool, CMSConcurrentMTEnabled, true, \
1779 "Whether multi-threaded concurrent work enabled " \
1780 "(effective only if ParNewGC)") \
1781 \
1782 product(bool, CMSPrecleaningEnabled, true, \
1783 "Whether concurrent precleaning enabled") \
1784 \
1785 product(uintx, CMSPrecleanIter, 3, \
1786 "Maximum number of precleaning iteration passes") \
1787 range(0, 9) \
1788 \
1789 product(uintx, CMSPrecleanDenominator, 3, \
1790 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1791 "ratio") \
1792 range(1, max_uintx) \
1793 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1794 \
1795 product(uintx, CMSPrecleanNumerator, 2, \
1796 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1797 "ratio") \
1798 range(0, max_uintx-1) \
1799 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1800 \
1801 product(bool, CMSPrecleanRefLists1, true, \
1802 "Preclean ref lists during (initial) preclean phase") \
1803 \
1804 product(bool, CMSPrecleanRefLists2, false, \
1805 "Preclean ref lists during abortable preclean phase") \
1806 \
1807 product(bool, CMSPrecleanSurvivors1, false, \
1808 "Preclean survivors during (initial) preclean phase") \
1809 \
1810 product(bool, CMSPrecleanSurvivors2, true, \
1811 "Preclean survivors during abortable preclean phase") \
1812 \
1813 product(uintx, CMSPrecleanThreshold, 1000, \
1814 "Do not iterate again if number of dirty cards is less than this")\
1815 range(100, max_uintx) \
1816 \
1817 product(bool, CMSCleanOnEnter, true, \
1818 "Clean-on-enter optimization for reducing number of dirty cards") \
1819 \
1820 product(uintx, CMSRemarkVerifyVariant, 1, \
1821 "Choose variant (1,2) of verification following remark") \
1822 range(1, 2) \
1823 \
1824 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1825 "If Eden size is below this, do not try to schedule remark") \
1826 range(0, max_uintx) \
1827 \
1828 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1829 "The Eden occupancy percentage (0-100) at which " \
1830 "to try and schedule remark pause") \
1831 range(0, 100) \
1832 \
1833 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1834 "Start sampling eden top at least before young gen " \
1835 "occupancy reaches 1/<ratio> of the size at which " \
1836 "we plan to schedule remark") \
1837 range(1, max_uintx) \
1838 \
1839 product(uintx, CMSSamplingGrain, 16*K, \
1840 "The minimum distance between eden samples for CMS (see above)") \
1841 range(ObjectAlignmentInBytes, max_uintx) \
1842 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \
1843 \
1844 product(bool, CMSScavengeBeforeRemark, false, \
1845 "Attempt scavenge before the CMS remark step") \
1846 \
1847 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1848 "Don't drain below this size per parallel worker/thief") \
1849 range(1, max_juint) \
1850 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \
1851 \
1852 manageable(intx, CMSWaitDuration, 2000, \
1853 "Time in milliseconds that CMS thread waits for young GC") \
1854 range(min_jint, max_jint) \
1855 \
1856 develop(uintx, CMSCheckInterval, 1000, \
1857 "Interval in milliseconds that CMS thread checks if it " \
1858 "should start a collection cycle") \
1859 \
1860 product(bool, CMSYield, true, \
1861 "Yield between steps of CMS") \
1862 \
1863 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1864 "Bitmap operations should process at most this many bits " \
1865 "between yields") \
1866 range(1, max_uintx) \
1867 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \
1868 \
1869 product(bool, CMSPrintChunksInDump, false, \
1870 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1871 "trace level include more detailed information about the" \
1872 "free chunks") \
1873 \
1874 product(bool, CMSPrintObjectsInDump, false, \
1875 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \
1876 "trace level include more detailed information about the" \
1877 "allocated objects") \
1878 \
1879 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1880 "Verify that all references across the FLS boundary " \
1881 "are to valid objects") \
1882 \
1883 diagnostic(bool, FLSVerifyLists, false, \
1884 "Do lots of (expensive) FreeListSpace verification") \
1885 \
1886 diagnostic(bool, FLSVerifyIndexTable, false, \
1887 "Do lots of (expensive) FLS index table verification") \
1888 \
1889 develop(bool, FLSVerifyDictionary, false, \
1890 "Do lots of (expensive) FLS dictionary verification") \
1891 \
1892 develop(bool, VerifyBlockOffsetArray, false, \
1893 "Do (expensive) block offset array verification") \
1894 \
1895 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1896 "Maintain _unallocated_block in BlockOffsetArray " \
1897 "(currently applicable only to CMS collector)") \
1898 \
1899 product(intx, RefDiscoveryPolicy, 0, \
1900 "Select type of reference discovery policy: " \
1901 "reference-based(0) or referent-based(1)") \
1902 range(ReferenceProcessor::DiscoveryPolicyMin, \
1903 ReferenceProcessor::DiscoveryPolicyMax) \
1904 \
1905 product(bool, ParallelRefProcEnabled, false, \
1906 "Enable parallel reference processing whenever possible") \
1907 \
1908 product(bool, ParallelRefProcBalancingEnabled, true, \
1909 "Enable balancing of reference processing queues") \
1910 \
1911 product(uintx, CMSTriggerRatio, 80, \
1912 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1913 "allocated before a CMS collection cycle commences") \
1914 range(0, 100) \
1915 \
1916 product(uintx, CMSBootstrapOccupancy, 50, \
1917 "Percentage CMS generation occupancy at which to " \
1918 "initiate CMS collection for bootstrapping collection stats") \
1919 range(0, 100) \
1920 \
1921 product(intx, CMSInitiatingOccupancyFraction, -1, \
1922 "Percentage CMS generation occupancy to start a CMS collection " \
1923 "cycle. A negative value means that CMSTriggerRatio is used") \
1924 range(min_intx, 100) \
1925 \
1926 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1927 "The percent occupancy (IHOP) of the current old generation " \
1928 "capacity above which a concurrent mark cycle will be initiated " \
1929 "Its value may change over time if adaptive IHOP is enabled, " \
1930 "otherwise the value remains constant. " \
1931 "In the latter case a value of 0 will result as frequent as " \
1932 "possible concurrent marking cycles. A value of 100 disables " \
1933 "concurrent marking. " \
1934 "Fragmentation waste in the old generation is not considered " \
1935 "free space in this calculation. (G1 collector only)") \
1936 range(0, 100) \
1937 \
1938 manageable(intx, CMSTriggerInterval, -1, \
1939 "Commence a CMS collection cycle (at least) every so many " \
1940 "milliseconds (0 permanently, -1 disabled)") \
1941 range(-1, max_intx) \
1942 \
1943 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1944 "Only use occupancy as a criterion for starting a CMS collection")\
1945 \
1946 product(uintx, CMSIsTooFullPercentage, 98, \
1947 "An absolute ceiling above which CMS will always consider the " \
1948 "unloading of classes when class unloading is enabled") \
1949 range(0, 100) \
1950 \
1951 develop(bool, CMSTestInFreeList, false, \
1952 "Check if the coalesced range is already in the " \
1953 "free lists as claimed") \
1954 \
1955 notproduct(bool, CMSVerifyReturnedBytes, false, \
1956 "Check that all the garbage collected was returned to the " \
1957 "free lists") \
1958 \
1959 notproduct(bool, ScavengeALot, false, \
1960 "Force scavenge at every Nth exit from the runtime system " \
1961 "(N=ScavengeALotInterval)") \
1962 \
1963 develop(bool, FullGCALot, false, \
1964 "Force full gc at every Nth exit from the runtime system " \
1965 "(N=FullGCALotInterval)") \
1966 \
1967 notproduct(bool, GCALotAtAllSafepoints, false, \
1968 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1969 \
1970 notproduct(bool, PromotionFailureALot, false, \
1971 "Use promotion failure handling on every youngest generation " \
1972 "collection") \
1973 \
1974 develop(uintx, PromotionFailureALotCount, 1000, \
1975 "Number of promotion failures occurring at PLAB " \
1976 "refill attempts (ParNew) or promotion attempts " \
1977 "(other young collectors)") \
1978 \
1979 develop(uintx, PromotionFailureALotInterval, 5, \
1980 "Total collections between promotion failures a lot") \
1981 \
1982 experimental(uintx, WorkStealingSleepMillis, 1, \
1983 "Sleep time when sleep is used for yields") \
1984 \
1985 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1986 "Number of yields before a sleep is done during work stealing") \
1987 \
1988 experimental(uintx, WorkStealingHardSpins, 4096, \
1989 "Number of iterations in a spin loop between checks on " \
1990 "time out of hard spin") \
1991 \
1992 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1993 "Ratio of hard spins to calls to yield") \
1994 \
1995 develop(uintx, ObjArrayMarkingStride, 2048, \
1996 "Number of object array elements to push onto the marking stack " \
1997 "before pushing a continuation entry") \
1998 \
1999 develop(bool, MetadataAllocationFailALot, false, \
2000 "Fail metadata allocations at intervals controlled by " \
2001 "MetadataAllocationFailALotInterval") \
2002 \
2003 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2004 "Metadata allocation failure a lot interval") \
2005 \
2006 notproduct(bool, ExecuteInternalVMTests, false, \
2007 "Enable execution of internal VM tests") \
2008 \
2009 notproduct(bool, VerboseInternalVMTests, false, \
2010 "Turn on logging for internal VM tests.") \
2011 \
2012 product(bool, ExecutingUnitTests, false, \
2013 "Whether the JVM is running unit tests or not") \
2014 \
2015 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2016 \
2017 product_pd(bool, ResizeTLAB, \
2018 "Dynamically resize TLAB size for threads") \
2019 \
2020 product(bool, ZeroTLAB, false, \
2021 "Zero out the newly created TLAB") \
2022 \
2023 product(bool, FastTLABRefill, false, \
2024 "(Deprecated) Use fast TLAB refill code") \
2025 \
2026 product(bool, TLABStats, true, \
2027 "Provide more detailed and expensive TLAB statistics.") \
2028 \
2029 product_pd(bool, NeverActAsServerClassMachine, \
2030 "Never act like a server-class machine") \
2031 \
2032 product(bool, AlwaysActAsServerClassMachine, false, \
2033 "Always act like a server-class machine") \
2034 \
2035 product_pd(uint64_t, MaxRAM, \
2036 "Real memory size (in bytes) used to set maximum heap size") \
2037 range(0, 0XFFFFFFFFFFFFFFFF) \
2038 \
2039 product(size_t, ErgoHeapSizeLimit, 0, \
2040 "Maximum ergonomically set heap size (in bytes); zero means use " \
2041 "MaxRAM * MaxRAMPercentage / 100") \
2042 range(0, max_uintx) \
2043 \
2044 experimental(bool, UseCGroupMemoryLimitForHeap, false, \
2045 "Use CGroup memory limit as physical memory limit for heap " \
2046 "sizing") \
2047 \
2048 product(uintx, MaxRAMFraction, 4, \
2049 "Maximum fraction (1/n) of real memory used for maximum heap " \
2050 "size. " \
2051 "Deprecated, use MaxRAMPercentage instead") \
2052 range(1, max_uintx) \
2053 \
2054 product(uintx, MinRAMFraction, 2, \
2055 "Minimum fraction (1/n) of real memory used for maximum heap " \
2056 "size on systems with small physical memory size. " \
2057 "Deprecated, use MinRAMPercentage instead") \
2058 range(1, max_uintx) \
2059 \
2060 product(uintx, InitialRAMFraction, 64, \
2061 "Fraction (1/n) of real memory used for initial heap size. " \
2062 "Deprecated, use InitialRAMPercentage instead") \
2063 range(1, max_uintx) \
2064 \
2065 product(double, MaxRAMPercentage, 25.0, \
2066 "Maximum percentage of real memory used for maximum heap size") \
2067 range(0.0, 100.0) \
2068 \
2069 product(double, MinRAMPercentage, 50.0, \
2070 "Minimum percentage of real memory used for maximum heap" \
2071 "size on systems with small physical memory size") \
2072 range(0.0, 100.0) \
2073 \
2074 product(double, InitialRAMPercentage, 1.5625, \
2075 "Percentage of real memory used for initial heap size") \
2076 range(0.0, 100.0) \
2077 \
2078 develop(uintx, MaxVirtMemFraction, 2, \
2079 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2080 "determining maximum heap size") \
2081 \
2082 product(bool, UseAdaptiveSizePolicy, true, \
2083 "Use adaptive generation sizing policies") \
2084 \
2085 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2086 "Use adaptive survivor sizing policies") \
2087 \
2088 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2089 "Use adaptive young-old sizing policies at minor collections") \
2090 \
2091 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2092 "Use adaptive young-old sizing policies at major collections") \
2093 \
2094 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2095 "Include statistics from System.gc() for adaptive size policy") \
2096 \
2097 product(bool, UseAdaptiveGCBoundary, false, \
2098 "Allow young-old boundary to move") \
2099 \
2100 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2101 "Resize the virtual spaces of the young or old generations") \
2102 range(-1, 1) \
2103 \
2104 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2105 "Policy for changing generation size for throughput goals") \
2106 range(0, 1) \
2107 \
2108 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2109 "Number of steps where heuristics is used before data is used") \
2110 range(0, max_uintx) \
2111 \
2112 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2113 "Number of collections before the adaptive sizing is started") \
2114 \
2115 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2116 "Collection interval for printing information; zero means never") \
2117 range(0, max_uintx) \
2118 \
2119 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2120 "Use adaptive minimum footprint as a goal") \
2121 \
2122 product(uintx, AdaptiveSizePolicyWeight, 10, \
2123 "Weight given to exponential resizing, between 0 and 100") \
2124 range(0, 100) \
2125 \
2126 product(uintx, AdaptiveTimeWeight, 25, \
2127 "Weight given to time in adaptive policy, between 0 and 100") \
2128 range(0, 100) \
2129 \
2130 product(uintx, PausePadding, 1, \
2131 "How much buffer to keep for pause time") \
2132 range(0, max_juint) \
2133 \
2134 product(uintx, PromotedPadding, 3, \
2135 "How much buffer to keep for promotion failure") \
2136 range(0, max_juint) \
2137 \
2138 product(uintx, SurvivorPadding, 3, \
2139 "How much buffer to keep for survivor overflow") \
2140 range(0, max_juint) \
2141 \
2142 product(uintx, ThresholdTolerance, 10, \
2143 "Allowed collection cost difference between generations") \
2144 range(0, 100) \
2145 \
2146 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2147 "If collection costs are within margin, reduce both by full " \
2148 "delta") \
2149 range(0, 100) \
2150 \
2151 product(uintx, YoungGenerationSizeIncrement, 20, \
2152 "Adaptive size percentage change in young generation") \
2153 range(0, 100) \
2154 \
2155 product(uintx, YoungGenerationSizeSupplement, 80, \
2156 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2157 range(0, 100) \
2158 \
2159 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2160 "Decay factor to YoungedGenerationSizeSupplement") \
2161 range(1, max_uintx) \
2162 \
2163 product(uintx, TenuredGenerationSizeIncrement, 20, \
2164 "Adaptive size percentage change in tenured generation") \
2165 range(0, 100) \
2166 \
2167 product(uintx, TenuredGenerationSizeSupplement, 80, \
2168 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2169 range(0, 100) \
2170 \
2171 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2172 "Decay factor to TenuredGenerationSizeIncrement") \
2173 range(1, max_uintx) \
2174 \
2175 product(uintx, MaxGCPauseMillis, max_uintx - 1, \
2176 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2177 "or (G1 Only) the maximum GC time per MMU time slice") \
2178 range(1, max_uintx - 1) \
2179 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \
2180 \
2181 product(uintx, GCPauseIntervalMillis, 0, \
2182 "Time slice for MMU specification") \
2183 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \
2184 \
2185 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2186 "Adaptive size policy maximum GC minor pause time goal " \
2187 "in millisecond") \
2188 range(0, max_uintx) \
2189 \
2190 product(uintx, GCTimeRatio, 99, \
2191 "Adaptive size policy application time to GC time ratio") \
2192 range(0, max_juint) \
2193 \
2194 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2195 "Adaptive size scale down factor for shrinking") \
2196 range(1, max_uintx) \
2197 \
2198 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2199 "Adaptive size decays the major cost for long major intervals") \
2200 \
2201 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2202 "Time scale over which major costs decay") \
2203 range(0, max_uintx) \
2204 \
2205 product(uintx, MinSurvivorRatio, 3, \
2206 "Minimum ratio of young generation/survivor space size") \
2207 range(3, max_uintx) \
2208 \
2209 product(uintx, InitialSurvivorRatio, 8, \
2210 "Initial ratio of young generation/survivor space size") \
2211 range(0, max_uintx) \
2212 \
2213 product(size_t, BaseFootPrintEstimate, 256*M, \
2214 "Estimate of footprint other than Java Heap") \
2215 range(0, max_uintx) \
2216 \
2217 product(bool, UseGCOverheadLimit, true, \
2218 "Use policy to limit of proportion of time spent in GC " \
2219 "before an OutOfMemory error is thrown") \
2220 \
2221 product(uintx, GCTimeLimit, 98, \
2222 "Limit of the proportion of time spent in GC before " \
2223 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2224 range(0, 100) \
2225 \
2226 product(uintx, GCHeapFreeLimit, 2, \
2227 "Minimum percentage of free space after a full GC before an " \
2228 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2229 range(0, 100) \
2230 \
2231 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2232 "Number of consecutive collections before gc time limit fires") \
2233 range(1, max_uintx) \
2234 \
2235 product(intx, PrefetchCopyIntervalInBytes, -1, \
2236 "How far ahead to prefetch destination area (<= 0 means off)") \
2237 range(-1, max_jint) \
2238 \
2239 product(intx, PrefetchScanIntervalInBytes, -1, \
2240 "How far ahead to prefetch scan area (<= 0 means off)") \
2241 range(-1, max_jint) \
2242 \
2243 product(intx, PrefetchFieldsAhead, -1, \
2244 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2245 range(-1, max_jint) \
2246 \
2247 diagnostic(bool, VerifyDuringStartup, false, \
2248 "Verify memory system before executing any Java code " \
2249 "during VM initialization") \
2250 \
2251 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2252 "Verify system before exiting") \
2253 \
2254 diagnostic(bool, VerifyBeforeGC, false, \
2255 "Verify memory system before GC") \
2256 \
2257 diagnostic(bool, VerifyAfterGC, false, \
2258 "Verify memory system after GC") \
2259 \
2260 diagnostic(bool, VerifyDuringGC, false, \
2261 "Verify memory system during GC (between phases)") \
2262 \
2263 diagnostic(ccstrlist, VerifySubSet, "", \
2264 "Memory sub-systems to verify when Verify*GC flag(s) " \
2265 "are enabled. One or more sub-systems can be specified " \
2266 "in a comma separated string. Sub-systems are: " \
2267 "threads, heap, symbol_table, string_table, codecache, " \
2268 "dictionary, classloader_data_graph, metaspace, jni_handles, " \
2269 "codecache_oops") \
2270 \
2271 diagnostic(bool, GCParallelVerificationEnabled, true, \
2272 "Enable parallel memory system verification") \
2273 \
2274 diagnostic(bool, DeferInitialCardMark, false, \
2275 "When +ReduceInitialCardMarks, explicitly defer any that " \
2276 "may arise from new_pre_store_barrier") \
2277 \
2278 product(bool, UseCondCardMark, false, \
2279 "Check for already marked card before updating card table") \
2280 \
2281 diagnostic(bool, VerifyRememberedSets, false, \
2282 "Verify GC remembered sets") \
2283 \
2284 diagnostic(bool, VerifyObjectStartArray, true, \
2285 "Verify GC object start array if verify before/after") \
2286 \
2287 product(bool, DisableExplicitGC, false, \
2288 "Ignore calls to System.gc()") \
2289 \
2290 notproduct(bool, CheckMemoryInitialization, false, \
2291 "Check memory initialization") \
2292 \
2293 diagnostic(bool, BindCMSThreadToCPU, false, \
2294 "Bind CMS Thread to CPU if possible") \
2295 \
2296 diagnostic(uintx, CPUForCMSThread, 0, \
2297 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2298 range(0, max_juint) \
2299 \
2300 product(bool, BindGCTaskThreadsToCPUs, false, \
2301 "Bind GCTaskThreads to CPUs if possible") \
2302 \
2303 product(bool, UseGCTaskAffinity, false, \
2304 "Use worker affinity when asking for GCTasks") \
2305 \
2306 product(uintx, ProcessDistributionStride, 4, \
2307 "Stride through processors when distributing processes") \
2308 range(0, max_juint) \
2309 \
2310 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2311 "Number of times the coordinator GC thread will sleep while " \
2312 "yielding before giving up and resuming GC") \
2313 range(0, max_juint) \
2314 \
2315 product(uintx, CMSYieldSleepCount, 0, \
2316 "Number of times a GC thread (minus the coordinator) " \
2317 "will sleep while yielding before giving up and resuming GC") \
2318 range(0, max_juint) \
2319 \
2320 product(bool, PrintGC, false, \
2321 "Print message at garbage collection. " \
2322 "Deprecated, use -Xlog:gc instead.") \
2323 \
2324 product(bool, PrintGCDetails, false, \
2325 "Print more details at garbage collection. " \
2326 "Deprecated, use -Xlog:gc* instead.") \
2327 \
2328 develop(intx, ConcGCYieldTimeout, 0, \
2329 "If non-zero, assert that GC threads yield within this " \
2330 "number of milliseconds") \
2331 range(0, max_intx) \
2332 \
2333 develop(bool, TraceFinalizerRegistration, false, \
2334 "Trace registration of final references") \
2335 \
2336 notproduct(bool, TraceScavenge, false, \
2337 "Trace scavenge") \
2338 \
2339 product(bool, IgnoreEmptyClassPaths, false, \
2340 "Ignore empty path elements in -classpath") \
2341 \
2342 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2343 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2344 "Initial size of the boot class loader data metaspace") \
2345 range(30*K, max_uintx/BytesPerWord) \
2346 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2347 \
2348 product(bool, PrintHeapAtSIGBREAK, true, \
2349 "Print heap layout in response to SIGBREAK") \
2350 \
2351 manageable(bool, PrintClassHistogram, false, \
2352 "Print a histogram of class instances") \
2353 \
2354 develop(bool, TraceGCTaskManager, false, \
2355 "Trace actions of the GC task manager") \
2356 \
2357 develop(bool, TraceGCTaskQueue, false, \
2358 "Trace actions of the GC task queues") \
2359 \
2360 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2361 "Trace marking phase in ParallelOldGC") \
2362 \
2363 develop(bool, TraceParallelOldGCDensePrefix, false, \
2364 "Trace dense prefix computation for ParallelOldGC") \
2365 \
2366 develop(bool, IgnoreLibthreadGPFault, false, \
2367 "Suppress workaround for libthread GP fault") \
2368 \
2369 experimental(double, ObjectCountCutOffPercent, 0.5, \
2370 "The percentage of the used heap that the instances of a class " \
2371 "must occupy for the class to generate a trace event") \
2372 range(0.0, 100.0) \
2373 \
2374 /* JVMTI heap profiling */ \
2375 \
2376 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2377 "Trace JVMTI object tagging calls") \
2378 \
2379 diagnostic(bool, VerifyBeforeIteration, false, \
2380 "Verify memory system before JVMTI iteration") \
2381 \
2382 /* compiler interface */ \
2383 \
2384 develop(bool, CIPrintCompilerName, false, \
2385 "when CIPrint is active, print the name of the active compiler") \
2386 \
2387 diagnostic(bool, CIPrintCompileQueue, false, \
2388 "display the contents of the compile queue whenever a " \
2389 "compilation is enqueued") \
2390 \
2391 develop(bool, CIPrintRequests, false, \
2392 "display every request for compilation") \
2393 \
2394 product(bool, CITime, false, \
2395 "collect timing information for compilation") \
2396 \
2397 develop(bool, CITimeVerbose, false, \
2398 "be more verbose in compilation timings") \
2399 \
2400 develop(bool, CITimeEach, false, \
2401 "display timing information after each successful compilation") \
2402 \
2403 develop(bool, CICountOSR, false, \
2404 "use a separate counter when assigning ids to osr compilations") \
2405 \
2406 develop(bool, CICompileNatives, true, \
2407 "compile native methods if supported by the compiler") \
2408 \
2409 develop_pd(bool, CICompileOSR, \
2410 "compile on stack replacement methods if supported by the " \
2411 "compiler") \
2412 \
2413 develop(bool, CIPrintMethodCodes, false, \
2414 "print method bytecodes of the compiled code") \
2415 \
2416 develop(bool, CIPrintTypeFlow, false, \
2417 "print the results of ciTypeFlow analysis") \
2418 \
2419 develop(bool, CITraceTypeFlow, false, \
2420 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2421 \
2422 develop(intx, OSROnlyBCI, -1, \
2423 "OSR only at this bci. Negative values mean exclude that bci") \
2424 \
2425 /* compiler */ \
2426 \
2427 /* notice: the max range value here is max_jint, not max_intx */ \
2428 /* because of overflow issue */ \
2429 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2430 "Number of compiler threads to run") \
2431 range(0, max_jint) \
2432 constraint(CICompilerCountConstraintFunc, AfterErgo) \
2433 \
2434 product(intx, CompilationPolicyChoice, 0, \
2435 "which compilation policy (0-3)") \
2436 range(0, 3) \
2437 \
2438 develop(bool, UseStackBanging, true, \
2439 "use stack banging for stack overflow checks (required for " \
2440 "proper StackOverflow handling; disable only to measure cost " \
2441 "of stackbanging)") \
2442 \
2443 develop(bool, UseStrictFP, true, \
2444 "use strict fp if modifier strictfp is set") \
2445 \
2446 develop(bool, GenerateSynchronizationCode, true, \
2447 "generate locking/unlocking code for synchronized methods and " \
2448 "monitors") \
2449 \
2450 develop(bool, GenerateRangeChecks, true, \
2451 "Generate range checks for array accesses") \
2452 \
2453 diagnostic_pd(bool, ImplicitNullChecks, \
2454 "Generate code for implicit null checks") \
2455 \
2456 product_pd(bool, TrapBasedNullChecks, \
2457 "Generate code for null checks that uses a cmp and trap " \
2458 "instruction raising SIGTRAP. This is only used if an access to" \
2459 "null (+offset) will not raise a SIGSEGV, i.e.," \
2460 "ImplicitNullChecks don't work (PPC64).") \
2461 \
2462 product(bool, PrintSafepointStatistics, false, \
2463 "Print statistics about safepoint synchronization") \
2464 \
2465 product(intx, PrintSafepointStatisticsCount, 300, \
2466 "Total number of safepoint statistics collected " \
2467 "before printing them out") \
2468 range(1, max_intx) \
2469 \
2470 product(intx, PrintSafepointStatisticsTimeout, -1, \
2471 "Print safepoint statistics only when safepoint takes " \
2472 "more than PrintSafepointSatisticsTimeout in millis") \
2473 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \
2474 NOT_LP64(range(-1, max_intx)) \
2475 \
2476 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \
2477 "Enable Thread SMR extra validity checks") \
2478 \
2479 diagnostic(bool, EnableThreadSMRStatistics, true, \
2480 "Enable Thread SMR Statistics") \
2481 \
2482 product(bool, Inline, true, \
2483 "Enable inlining") \
2484 \
2485 product(bool, ClipInlining, true, \
2486 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2487 \
2488 develop(bool, UseCHA, true, \
2489 "Enable CHA") \
2490 \
2491 product(bool, UseTypeProfile, true, \
2492 "Check interpreter profile for historically monomorphic calls") \
2493 \
2494 diagnostic(bool, PrintInlining, false, \
2495 "Print inlining optimizations") \
2496 \
2497 product(bool, UsePopCountInstruction, false, \
2498 "Use population count instruction") \
2499 \
2500 develop(bool, EagerInitialization, false, \
2501 "Eagerly initialize classes if possible") \
2502 \
2503 diagnostic(bool, LogTouchedMethods, false, \
2504 "Log methods which have been ever touched in runtime") \
2505 \
2506 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2507 "Print all methods that have been ever touched in runtime") \
2508 \
2509 develop(bool, TraceMethodReplacement, false, \
2510 "Print when methods are replaced do to recompilation") \
2511 \
2512 develop(bool, PrintMethodFlushing, false, \
2513 "Print the nmethods being flushed") \
2514 \
2515 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2516 "print statistics about method flushing") \
2517 \
2518 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2519 "Number of compiled code invocations after which " \
2520 "the method is considered as hot by the flusher") \
2521 range(1, max_jint) \
2522 \
2523 diagnostic(intx, MinPassesBeforeFlush, 10, \
2524 "Minimum number of sweeper passes before an nmethod " \
2525 "can be flushed") \
2526 range(0, max_intx) \
2527 \
2528 product(bool, UseCodeAging, true, \
2529 "Insert counter to detect warm methods") \
2530 \
2531 diagnostic(bool, StressCodeAging, false, \
2532 "Start with counters compiled in") \
2533 \
2534 develop(bool, StressCodeBuffers, false, \
2535 "Exercise code buffer expansion and other rare state changes") \
2536 \
2537 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2538 "Generate extra debugging information for non-safepoints in " \
2539 "nmethods") \
2540 \
2541 product(bool, PrintVMOptions, false, \
2542 "Print flags that appeared on the command line") \
2543 \
2544 product(bool, IgnoreUnrecognizedVMOptions, false, \
2545 "Ignore unrecognized VM options") \
2546 \
2547 product(bool, PrintCommandLineFlags, false, \
2548 "Print flags specified on command line or set by ergonomics") \
2549 \
2550 product(bool, PrintFlagsInitial, false, \
2551 "Print all VM flags before argument processing and exit VM") \
2552 \
2553 product(bool, PrintFlagsFinal, false, \
2554 "Print all VM flags after argument and ergonomic processing") \
2555 \
2556 notproduct(bool, PrintFlagsWithComments, false, \
2557 "Print all VM flags with default values and descriptions and " \
2558 "exit") \
2559 \
2560 product(bool, PrintFlagsRanges, false, \
2561 "Print VM flags and their ranges and exit VM") \
2562 \
2563 diagnostic(bool, SerializeVMOutput, true, \
2564 "Use a mutex to serialize output to tty and LogFile") \
2565 \
2566 diagnostic(bool, DisplayVMOutput, true, \
2567 "Display all VM output on the tty, independently of LogVMOutput") \
2568 \
2569 diagnostic(bool, LogVMOutput, false, \
2570 "Save VM output to LogFile") \
2571 \
2572 diagnostic(ccstr, LogFile, NULL, \
2573 "If LogVMOutput or LogCompilation is on, save VM output to " \
2574 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2575 \
2576 product(ccstr, ErrorFile, NULL, \
2577 "If an error occurs, save the error data to this file " \
2578 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2579 \
2580 product(bool, DisplayVMOutputToStderr, false, \
2581 "If DisplayVMOutput is true, display all VM output to stderr") \
2582 \
2583 product(bool, DisplayVMOutputToStdout, false, \
2584 "If DisplayVMOutput is true, display all VM output to stdout") \
2585 \
2586 product(bool, UseHeavyMonitors, false, \
2587 "use heavyweight instead of lightweight Java monitors") \
2588 \
2589 product(bool, PrintStringTableStatistics, false, \
2590 "print statistics about the StringTable and SymbolTable") \
2591 \
2592 diagnostic(bool, VerifyStringTableAtExit, false, \
2593 "verify StringTable contents at exit") \
2594 \
2595 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2596 "print histogram of the symbol table") \
2597 \
2598 notproduct(bool, ExitVMOnVerifyError, false, \
2599 "standard exit from VM if bytecode verify error " \
2600 "(only in debug mode)") \
2601 \
2602 diagnostic(ccstr, AbortVMOnException, NULL, \
2603 "Call fatal if this exception is thrown. Example: " \
2604 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2605 \
2606 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
2607 "Call fatal if the exception pointed by AbortVMOnException " \
2608 "has this message") \
2609 \
2610 develop(bool, DebugVtables, false, \
2611 "add debugging code to vtable dispatch") \
2612 \
2613 notproduct(bool, PrintVtableStats, false, \
2614 "print vtables stats at end of run") \
2615 \
2616 develop(bool, TraceCreateZombies, false, \
2617 "trace creation of zombie nmethods") \
2618 \
2619 notproduct(bool, IgnoreLockingAssertions, false, \
2620 "disable locking assertions (for speed)") \
2621 \
2622 product(bool, RangeCheckElimination, true, \
2623 "Eliminate range checks") \
2624 \
2625 develop_pd(bool, UncommonNullCast, \
2626 "track occurrences of null in casts; adjust compiler tactics") \
2627 \
2628 develop(bool, TypeProfileCasts, true, \
2629 "treat casts like calls for purposes of type profiling") \
2630 \
2631 develop(bool, DelayCompilationDuringStartup, true, \
2632 "Delay invoking the compiler until main application class is " \
2633 "loaded") \
2634 \
2635 develop(bool, CompileTheWorld, false, \
2636 "Compile all methods in all classes in bootstrap class path " \
2637 "(stress test)") \
2638 \
2639 develop(bool, CompileTheWorldPreloadClasses, true, \
2640 "Preload all classes used by a class before start loading") \
2641 \
2642 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2643 "Force a safepoint every n compiles so sweeper can keep up") \
2644 \
2645 develop(bool, FillDelaySlots, true, \
2646 "Fill delay slots (on SPARC only)") \
2647 \
2648 develop(bool, TimeLivenessAnalysis, false, \
2649 "Time computation of bytecode liveness analysis") \
2650 \
2651 develop(bool, TraceLivenessGen, false, \
2652 "Trace the generation of liveness analysis information") \
2653 \
2654 notproduct(bool, TraceLivenessQuery, false, \
2655 "Trace queries of liveness analysis information") \
2656 \
2657 notproduct(bool, CollectIndexSetStatistics, false, \
2658 "Collect information about IndexSets") \
2659 \
2660 develop(bool, UseLoopSafepoints, true, \
2661 "Generate Safepoint nodes in every loop") \
2662 \
2663 develop(intx, FastAllocateSizeLimit, 128*K, \
2664 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2665 "Inline allocations larger than this in doublewords must go slow")\
2666 \
2667 product(bool, AggressiveOpts, false, \
2668 "Enable aggressive optimizations - see arguments.cpp") \
2669 \
2670 product_pd(bool, CompactStrings, \
2671 "Enable Strings to use single byte chars in backing store") \
2672 \
2673 product_pd(uintx, TypeProfileLevel, \
2674 "=XYZ, with Z: Type profiling of arguments at call; " \
2675 "Y: Type profiling of return value at call; " \
2676 "X: Type profiling of parameters to methods; " \
2677 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2678 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
2679 \
2680 product(intx, TypeProfileArgsLimit, 2, \
2681 "max number of call arguments to consider for type profiling") \
2682 range(0, 16) \
2683 \
2684 product(intx, TypeProfileParmsLimit, 2, \
2685 "max number of incoming parameters to consider for type profiling"\
2686 ", -1 for all") \
2687 range(-1, 64) \
2688 \
2689 /* statistics */ \
2690 develop(bool, CountCompiledCalls, false, \
2691 "Count method invocations") \
2692 \
2693 notproduct(bool, CountRuntimeCalls, false, \
2694 "Count VM runtime calls") \
2695 \
2696 develop(bool, CountJNICalls, false, \
2697 "Count jni method invocations") \
2698 \
2699 notproduct(bool, CountJVMCalls, false, \
2700 "Count jvm method invocations") \
2701 \
2702 notproduct(bool, CountRemovableExceptions, false, \
2703 "Count exceptions that could be replaced by branches due to " \
2704 "inlining") \
2705 \
2706 notproduct(bool, ICMissHistogram, false, \
2707 "Produce histogram of IC misses") \
2708 \
2709 /* interpreter */ \
2710 product_pd(bool, RewriteBytecodes, \
2711 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2712 \
2713 product_pd(bool, RewriteFrequentPairs, \
2714 "Rewrite frequently used bytecode pairs into a single bytecode") \
2715 \
2716 diagnostic(bool, PrintInterpreter, false, \
2717 "Print the generated interpreter code") \
2718 \
2719 product(bool, UseInterpreter, true, \
2720 "Use interpreter for non-compiled methods") \
2721 \
2722 develop(bool, UseFastSignatureHandlers, true, \
2723 "Use fast signature handlers for native calls") \
2724 \
2725 product(bool, UseLoopCounter, true, \
2726 "Increment invocation counter on backward branch") \
2727 \
2728 product_pd(bool, UseOnStackReplacement, \
2729 "Use on stack replacement, calls runtime if invoc. counter " \
2730 "overflows in loop") \
2731 \
2732 notproduct(bool, TraceOnStackReplacement, false, \
2733 "Trace on stack replacement") \
2734 \
2735 product_pd(bool, PreferInterpreterNativeStubs, \
2736 "Use always interpreter stubs for native methods invoked via " \
2737 "interpreter") \
2738 \
2739 develop(bool, CountBytecodes, false, \
2740 "Count number of bytecodes executed") \
2741 \
2742 develop(bool, PrintBytecodeHistogram, false, \
2743 "Print histogram of the executed bytecodes") \
2744 \
2745 develop(bool, PrintBytecodePairHistogram, false, \
2746 "Print histogram of the executed bytecode pairs") \
2747 \
2748 diagnostic(bool, PrintSignatureHandlers, false, \
2749 "Print code generated for native method signature handlers") \
2750 \
2751 develop(bool, VerifyOops, false, \
2752 "Do plausibility checks for oops") \
2753 \
2754 develop(bool, CheckUnhandledOops, false, \
2755 "Check for unhandled oops in VM code") \
2756 \
2757 develop(bool, VerifyJNIFields, trueInDebug, \
2758 "Verify jfieldIDs for instance fields") \
2759 \
2760 notproduct(bool, VerifyJNIEnvThread, false, \
2761 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2762 "from JNI") \
2763 \
2764 develop(bool, VerifyFPU, false, \
2765 "Verify FPU state (check for NaN's, etc.)") \
2766 \
2767 develop(bool, VerifyThread, false, \
2768 "Watch the thread register for corruption (SPARC only)") \
2769 \
2770 develop(bool, VerifyActivationFrameSize, false, \
2771 "Verify that activation frame didn't become smaller than its " \
2772 "minimal size") \
2773 \
2774 develop(bool, TraceFrequencyInlining, false, \
2775 "Trace frequency based inlining") \
2776 \
2777 develop_pd(bool, InlineIntrinsics, \
2778 "Inline intrinsics that can be statically resolved") \
2779 \
2780 product_pd(bool, ProfileInterpreter, \
2781 "Profile at the bytecode level during interpretation") \
2782 \
2783 develop(bool, TraceProfileInterpreter, false, \
2784 "Trace profiling at the bytecode level during interpretation. " \
2785 "This outputs the profiling information collected to improve " \
2786 "jit compilation.") \
2787 \
2788 develop_pd(bool, ProfileTraps, \
2789 "Profile deoptimization traps at the bytecode level") \
2790 \
2791 product(intx, ProfileMaturityPercentage, 20, \
2792 "number of method invocations/branches (expressed as % of " \
2793 "CompileThreshold) before using the method's profile") \
2794 range(0, 100) \
2795 \
2796 diagnostic(bool, PrintMethodData, false, \
2797 "Print the results of +ProfileInterpreter at end of run") \
2798 \
2799 develop(bool, VerifyDataPointer, trueInDebug, \
2800 "Verify the method data pointer during interpreter profiling") \
2801 \
2802 develop(bool, VerifyCompiledCode, false, \
2803 "Include miscellaneous runtime verifications in nmethod code; " \
2804 "default off because it disturbs nmethod size heuristics") \
2805 \
2806 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2807 "Manually make GC thread crash then dump java stack trace; " \
2808 "Test only") \
2809 \
2810 /* compilation */ \
2811 product(bool, UseCompiler, true, \
2812 "Use Just-In-Time compilation") \
2813 \
2814 develop(bool, TraceCompilationPolicy, false, \
2815 "Trace compilation policy") \
2816 \
2817 develop(bool, TimeCompilationPolicy, false, \
2818 "Time the compilation policy") \
2819 \
2820 product(bool, UseCounterDecay, true, \
2821 "Adjust recompilation counters") \
2822 \
2823 develop(intx, CounterHalfLifeTime, 30, \
2824 "Half-life time of invocation counters (in seconds)") \
2825 \
2826 develop(intx, CounterDecayMinIntervalLength, 500, \
2827 "The minimum interval (in milliseconds) between invocation of " \
2828 "CounterDecay") \
2829 \
2830 product(bool, AlwaysCompileLoopMethods, false, \
2831 "When using recompilation, never interpret methods " \
2832 "containing loops") \
2833 \
2834 product(bool, DontCompileHugeMethods, true, \
2835 "Do not compile methods > HugeMethodLimit") \
2836 \
2837 /* Bytecode escape analysis estimation. */ \
2838 product(bool, EstimateArgEscape, true, \
2839 "Analyze bytecodes to estimate escape state of arguments") \
2840 \
2841 product(intx, BCEATraceLevel, 0, \
2842 "How much tracing to do of bytecode escape analysis estimates " \
2843 "(0-3)") \
2844 range(0, 3) \
2845 \
2846 product(intx, MaxBCEAEstimateLevel, 5, \
2847 "Maximum number of nested calls that are analyzed by BC EA") \
2848 range(0, max_jint) \
2849 \
2850 product(intx, MaxBCEAEstimateSize, 150, \
2851 "Maximum bytecode size of a method to be analyzed by BC EA") \
2852 range(0, max_jint) \
2853 \
2854 product(intx, AllocatePrefetchStyle, 1, \
2855 "0 = no prefetch, " \
2856 "1 = generate prefetch instructions for each allocation, " \
2857 "2 = use TLAB watermark to gate allocation prefetch, " \
2858 "3 = generate one prefetch instruction per cache line") \
2859 range(0, 3) \
2860 \
2861 product(intx, AllocatePrefetchDistance, -1, \
2862 "Distance to prefetch ahead of allocation pointer. " \
2863 "-1: use system-specific value (automatically determined") \
2864 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2865 \
2866 product(intx, AllocatePrefetchLines, 3, \
2867 "Number of lines to prefetch ahead of array allocation pointer") \
2868 range(1, 64) \
2869 \
2870 product(intx, AllocateInstancePrefetchLines, 1, \
2871 "Number of lines to prefetch ahead of instance allocation " \
2872 "pointer") \
2873 range(1, 64) \
2874 \
2875 product(intx, AllocatePrefetchStepSize, 16, \
2876 "Step size in bytes of sequential prefetch instructions") \
2877 range(1, 512) \
2878 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2879 \
2880 product(intx, AllocatePrefetchInstr, 0, \
2881 "Select instruction to prefetch ahead of allocation pointer") \
2882 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
2883 \
2884 /* deoptimization */ \
2885 develop(bool, TraceDeoptimization, false, \
2886 "Trace deoptimization") \
2887 \
2888 develop(bool, PrintDeoptimizationDetails, false, \
2889 "Print more information about deoptimization") \
2890 \
2891 develop(bool, DebugDeoptimization, false, \
2892 "Tracing various information while debugging deoptimization") \
2893 \
2894 product(intx, SelfDestructTimer, 0, \
2895 "Will cause VM to terminate after a given time (in minutes) " \
2896 "(0 means off)") \
2897 range(0, max_intx) \
2898 \
2899 product(intx, MaxJavaStackTraceDepth, 1024, \
2900 "The maximum number of lines in the stack trace for Java " \
2901 "exceptions (0 means all)") \
2902 range(0, max_jint/2) \
2903 \
2904 /* notice: the max range value here is max_jint, not max_intx */ \
2905 /* because of overflow issue */ \
2906 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2907 "Guarantee a safepoint (at least) every so many milliseconds " \
2908 "(0 means none)") \
2909 range(0, max_jint) \
2910 \
2911 product(intx, SafepointTimeoutDelay, 10000, \
2912 "Delay in milliseconds for option SafepointTimeout") \
2913 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
2914 NOT_LP64(range(0, max_intx)) \
2915 \
2916 product(intx, NmethodSweepActivity, 10, \
2917 "Removes cold nmethods from code cache if > 0. Higher values " \
2918 "result in more aggressive sweeping") \
2919 range(0, 2000) \
2920 \
2921 notproduct(bool, LogSweeper, false, \
2922 "Keep a ring buffer of sweeper activity") \
2923 \
2924 notproduct(intx, SweeperLogEntries, 1024, \
2925 "Number of records in the ring buffer of sweeper activity") \
2926 \
2927 notproduct(intx, MemProfilingInterval, 500, \
2928 "Time between each invocation of the MemProfiler") \
2929 \
2930 develop(intx, MallocCatchPtr, -1, \
2931 "Hit breakpoint when mallocing/freeing this pointer") \
2932 \
2933 notproduct(ccstrlist, SuppressErrorAt, "", \
2934 "List of assertions (file:line) to muzzle") \
2935 \
2936 develop(intx, StackPrintLimit, 100, \
2937 "number of stack frames to print in VM-level stack dump") \
2938 \
2939 notproduct(intx, MaxElementPrintSize, 256, \
2940 "maximum number of elements to print") \
2941 \
2942 notproduct(intx, MaxSubklassPrintSize, 4, \
2943 "maximum number of subklasses to print when printing klass") \
2944 \
2945 product(intx, MaxInlineLevel, 9, \
2946 "maximum number of nested calls that are inlined") \
2947 range(0, max_jint) \
2948 \
2949 product(intx, MaxRecursiveInlineLevel, 1, \
2950 "maximum number of nested recursive calls that are inlined") \
2951 range(0, max_jint) \
2952 \
2953 develop(intx, MaxForceInlineLevel, 100, \
2954 "maximum number of nested calls that are forced for inlining " \
2955 "(using CompileCommand or marked w/ @ForceInline)") \
2956 range(0, max_jint) \
2957 \
2958 product_pd(intx, InlineSmallCode, \
2959 "Only inline already compiled methods if their code size is " \
2960 "less than this") \
2961 range(0, max_jint) \
2962 \
2963 product(intx, MaxInlineSize, 35, \
2964 "The maximum bytecode size of a method to be inlined") \
2965 range(0, max_jint) \
2966 \
2967 product_pd(intx, FreqInlineSize, \
2968 "The maximum bytecode size of a frequent method to be inlined") \
2969 range(0, max_jint) \
2970 \
2971 product(intx, MaxTrivialSize, 6, \
2972 "The maximum bytecode size of a trivial method to be inlined") \
2973 range(0, max_jint) \
2974 \
2975 product(intx, MinInliningThreshold, 250, \
2976 "The minimum invocation count a method needs to have to be " \
2977 "inlined") \
2978 range(0, max_jint) \
2979 \
2980 develop(intx, MethodHistogramCutoff, 100, \
2981 "The cutoff value for method invocation histogram (+CountCalls)") \
2982 \
2983 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \
2984 "Number of interpreted methods to show in profile") \
2985 \
2986 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \
2987 "Number of compiled methods to show in profile") \
2988 \
2989 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \
2990 "Number of stub methods to show in profile") \
2991 \
2992 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2993 "Number of runtime stub nodes to show in profile") \
2994 \
2995 product(intx, ProfileIntervalsTicks, 100, \
2996 "Number of ticks between printing of interval profile " \
2997 "(+ProfileIntervals)") \
2998 range(0, max_intx) \
2999 \
3000 notproduct(intx, ScavengeALotInterval, 1, \
3001 "Interval between which scavenge will occur with +ScavengeALot") \
3002 \
3003 notproduct(intx, FullGCALotInterval, 1, \
3004 "Interval between which full gc will occur with +FullGCALot") \
3005 \
3006 notproduct(intx, FullGCALotStart, 0, \
3007 "For which invocation to start FullGCAlot") \
3008 \
3009 notproduct(intx, FullGCALotDummies, 32*K, \
3010 "Dummy object allocated with +FullGCALot, forcing all objects " \
3011 "to move") \
3012 \
3013 develop(intx, DontYieldALotInterval, 10, \
3014 "Interval between which yields will be dropped (milliseconds)") \
3015 \
3016 develop(intx, ProfilerPCTickThreshold, 15, \
3017 "Number of ticks in a PC buckets to be a hotspot") \
3018 \
3019 notproduct(intx, DeoptimizeALotInterval, 5, \
3020 "Number of exits until DeoptimizeALot kicks in") \
3021 \
3022 notproduct(intx, ZombieALotInterval, 5, \
3023 "Number of exits until ZombieALot kicks in") \
3024 \
3025 diagnostic(uintx, MallocMaxTestWords, 0, \
3026 "If non-zero, maximum number of words that malloc/realloc can " \
3027 "allocate (for testing only)") \
3028 range(0, max_uintx) \
3029 \
3030 product(intx, TypeProfileWidth, 2, \
3031 "Number of receiver types to record in call/cast profile") \
3032 range(0, 8) \
3033 \
3034 develop(intx, BciProfileWidth, 2, \
3035 "Number of return bci's to record in ret profile") \
3036 \
3037 product(intx, PerMethodRecompilationCutoff, 400, \
3038 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3039 range(-1, max_intx) \
3040 \
3041 product(intx, PerBytecodeRecompilationCutoff, 200, \
3042 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3043 range(-1, max_intx) \
3044 \
3045 product(intx, PerMethodTrapLimit, 100, \
3046 "Limit on traps (of one kind) in a method (includes inlines)") \
3047 range(0, max_jint) \
3048 \
3049 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3050 "Limit on speculative traps (of one kind) in a method " \
3051 "(includes inlines)") \
3052 range(0, max_jint) \
3053 \
3054 product(intx, PerBytecodeTrapLimit, 4, \
3055 "Limit on traps (of one kind) at a particular BCI") \
3056 range(0, max_jint) \
3057 \
3058 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3059 "Extra method data trap entries for speculation") \
3060 \
3061 develop(intx, InlineFrequencyRatio, 20, \
3062 "Ratio of call site execution to caller method invocation") \
3063 range(0, max_jint) \
3064 \
3065 diagnostic_pd(intx, InlineFrequencyCount, \
3066 "Count of call site execution necessary to trigger frequent " \
3067 "inlining") \
3068 range(0, max_jint) \
3069 \
3070 develop(intx, InlineThrowCount, 50, \
3071 "Force inlining of interpreted methods that throw this often") \
3072 range(0, max_jint) \
3073 \
3074 develop(intx, InlineThrowMaxSize, 200, \
3075 "Force inlining of throwing methods smaller than this") \
3076 range(0, max_jint) \
3077 \
3078 develop(intx, ProfilerNodeSize, 1024, \
3079 "Size in K to allocate for the Profile Nodes of each thread") \
3080 range(0, 1024) \
3081 \
3082 /* gc parameters */ \
3083 product(size_t, InitialHeapSize, 0, \
3084 "Initial heap size (in bytes); zero means use ergonomics") \
3085 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \
3086 \
3087 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3088 "Maximum heap size (in bytes)") \
3089 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \
3090 \
3091 product(size_t, OldSize, ScaleForWordSize(4*M), \
3092 "Initial tenured generation size (in bytes)") \
3093 range(0, max_uintx) \
3094 \
3095 product(size_t, NewSize, ScaleForWordSize(1*M), \
3096 "Initial new generation size (in bytes)") \
3097 constraint(NewSizeConstraintFunc,AfterErgo) \
3098 \
3099 product(size_t, MaxNewSize, max_uintx, \
3100 "Maximum new generation size (in bytes), max_uintx means set " \
3101 "ergonomically") \
3102 range(0, max_uintx) \
3103 \
3104 product_pd(size_t, HeapBaseMinAddress, \
3105 "OS specific low limit for heap base address") \
3106 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \
3107 \
3108 product(size_t, PretenureSizeThreshold, 0, \
3109 "Maximum size in bytes of objects allocated in DefNew " \
3110 "generation; zero means no maximum") \
3111 range(0, max_uintx) \
3112 \
3113 product(size_t, MinTLABSize, 2*K, \
3114 "Minimum allowed TLAB size (in bytes)") \
3115 range(1, max_uintx/2) \
3116 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \
3117 \
3118 product(size_t, TLABSize, 0, \
3119 "Starting TLAB size (in bytes); zero means set ergonomically") \
3120 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \
3121 \
3122 product(size_t, YoungPLABSize, 4096, \
3123 "Size of young gen promotion LAB's (in HeapWords)") \
3124 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
3125 \
3126 product(size_t, OldPLABSize, 1024, \
3127 "Size of old gen promotion LAB's (in HeapWords), or Number " \
3128 "of blocks to attempt to claim when refilling CMS LAB's") \
3129 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \
3130 \
3131 product(uintx, TLABAllocationWeight, 35, \
3132 "Allocation averaging weight") \
3133 range(0, 100) \
3134 \
3135 /* Limit the lower bound of this flag to 1 as it is used */ \
3136 /* in a division expression. */ \
3137 product(uintx, TLABWasteTargetPercent, 1, \
3138 "Percentage of Eden that can be wasted") \
3139 range(1, 100) \
3140 \
3141 product(uintx, TLABRefillWasteFraction, 64, \
3142 "Maximum TLAB waste at a refill (internal fragmentation)") \
3143 range(1, max_juint) \
3144 \
3145 product(uintx, TLABWasteIncrement, 4, \
3146 "Increment allowed waste at slow allocation") \
3147 range(0, max_jint) \
3148 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \
3149 \
3150 product(uintx, SurvivorRatio, 8, \
3151 "Ratio of eden/survivor space size") \
3152 range(1, max_uintx-2) \
3153 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \
3154 \
3155 product(uintx, NewRatio, 2, \
3156 "Ratio of old/new generation sizes") \
3157 range(0, max_uintx-1) \
3158 \
3159 product_pd(size_t, NewSizeThreadIncrease, \
3160 "Additional size added to desired new generation size per " \
3161 "non-daemon thread (in bytes)") \
3162 range(0, max_uintx) \
3163 \
3164 product_pd(size_t, MetaspaceSize, \
3165 "Initial threshold (in bytes) at which a garbage collection " \
3166 "is done to reduce Metaspace usage") \
3167 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
3168 \
3169 product(size_t, MaxMetaspaceSize, max_uintx, \
3170 "Maximum size of Metaspaces (in bytes)") \
3171 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
3172 \
3173 product(size_t, CompressedClassSpaceSize, 1*G, \
3174 "Maximum size of class area in Metaspace when compressed " \
3175 "class pointers are used") \
3176 range(1*M, 3*G) \
3177 \
3178 manageable(uintx, MinHeapFreeRatio, 40, \
3179 "The minimum percentage of heap free after GC to avoid expansion."\
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(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3184 \
3185 manageable(uintx, MaxHeapFreeRatio, 70, \
3186 "The maximum percentage of heap free after GC to avoid shrinking."\
3187 " For most GCs this applies to the old generation. In G1 and" \
3188 " ParallelGC it applies to the whole heap.") \
3189 range(0, 100) \
3190 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3191 \
3192 product(bool, ShrinkHeapInSteps, true, \
3193 "When disabled, informs the GC to shrink the java heap directly" \
3194 " to the target size at the next full GC rather than requiring" \
3195 " smaller steps during multiple full GCs.") \
3196 \
3197 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3198 "Number of milliseconds per MB of free space in the heap") \
3199 range(0, max_intx) \
3200 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3201 \
3202 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3203 "The minimum change in heap space due to GC (in bytes)") \
3204 range(0, max_uintx) \
3205 \
3206 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3207 "The minimum expansion of Metaspace (in bytes)") \
3208 range(0, max_uintx) \
3209 \
3210 product(uintx, MaxMetaspaceFreeRatio, 70, \
3211 "The maximum percentage of Metaspace free after GC to avoid " \
3212 "shrinking") \
3213 range(0, 100) \
3214 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3215 \
3216 product(uintx, MinMetaspaceFreeRatio, 40, \
3217 "The minimum percentage of Metaspace free after GC to avoid " \
3218 "expansion") \
3219 range(0, 99) \
3220 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3221 \
3222 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3223 "The maximum expansion of Metaspace without full GC (in bytes)") \
3224 range(0, max_uintx) \
3225 \
3226 product(uintx, QueuedAllocationWarningCount, 0, \
3227 "Number of times an allocation that queues behind a GC " \
3228 "will retry before printing a warning") \
3229 range(0, max_uintx) \
3230 \
3231 diagnostic(uintx, VerifyGCStartAt, 0, \
3232 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3233 range(0, max_uintx) \
3234 \
3235 diagnostic(intx, VerifyGCLevel, 0, \
3236 "Generation level at which to start +VerifyBefore/AfterGC") \
3237 range(0, 1) \
3238 \
3239 product(uintx, MaxTenuringThreshold, 15, \
3240 "Maximum value for tenuring threshold") \
3241 range(0, markOopDesc::max_age + 1) \
3242 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3243 \
3244 product(uintx, InitialTenuringThreshold, 7, \
3245 "Initial value for tenuring threshold") \
3246 range(0, markOopDesc::max_age + 1) \
3247 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3248 \
3249 product(uintx, TargetSurvivorRatio, 50, \
3250 "Desired percentage of survivor space used after scavenge") \
3251 range(0, 100) \
3252 \
3253 product(uintx, MarkSweepDeadRatio, 5, \
3254 "Percentage (0-100) of the old gen allowed as dead wood. " \
3255 "Serial mark sweep treats this as both the minimum and maximum " \
3256 "value. " \
3257 "CMS uses this value only if it falls back to mark sweep. " \
3258 "Par compact uses a variable scale based on the density of the " \
3259 "generation and treats this as the maximum value when the heap " \
3260 "is either completely full or completely empty. Par compact " \
3261 "also has a smaller default value; see arguments.cpp.") \
3262 range(0, 100) \
3263 \
3264 product(uint, MarkSweepAlwaysCompactCount, 4, \
3265 "How often should we fully compact the heap (ignoring the dead " \
3266 "space parameters)") \
3267 range(1, max_juint) \
3268 \
3269 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3270 "Delay between expansion and allocation (in milliseconds)") \
3271 \
3272 develop(uintx, GCWorkerDelayMillis, 0, \
3273 "Delay in scheduling GC workers (in milliseconds)") \
3274 \
3275 product(intx, DeferThrSuspendLoopCount, 4000, \
3276 "(Unstable) Number of times to iterate in safepoint loop " \
3277 "before blocking VM threads ") \
3278 range(-1, max_jint-1) \
3279 \
3280 product(intx, DeferPollingPageLoopCount, -1, \
3281 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3282 "before changing safepoint polling page to RO ") \
3283 range(-1, max_jint-1) \
3284 \
3285 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3286 range(0, max_intx) \
3287 \
3288 product(bool, PSChunkLargeArrays, true, \
3289 "Process large arrays in chunks") \
3290 \
3291 product(uintx, GCDrainStackTargetSize, 64, \
3292 "Number of entries we will try to leave on the stack " \
3293 "during parallel gc") \
3294 range(0, max_juint) \
3295 \
3296 /* stack parameters */ \
3297 product_pd(intx, StackYellowPages, \
3298 "Number of yellow zone (recoverable overflows) pages of size " \
3299 "4KB. If pages are bigger yellow zone is aligned up.") \
3300 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
3301 \
3302 product_pd(intx, StackRedPages, \
3303 "Number of red zone (unrecoverable overflows) pages of size " \
3304 "4KB. If pages are bigger red zone is aligned up.") \
3305 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
3306 \
3307 product_pd(intx, StackReservedPages, \
3308 "Number of reserved zone (reserved to annotated methods) pages" \
3309 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3310 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3311 \
3312 product(bool, RestrictReservedStack, true, \
3313 "Restrict @ReservedStackAccess to trusted classes") \
3314 \
3315 /* greater stack shadow pages can't generate instruction to bang stack */ \
3316 product_pd(intx, StackShadowPages, \
3317 "Number of shadow zone (for overflow checking) pages of size " \
3318 "4KB. If pages are bigger shadow zone is aligned up. " \
3319 "This should exceed the depth of the VM and native call stack.") \
3320 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
3321 \
3322 product_pd(intx, ThreadStackSize, \
3323 "Thread Stack Size (in Kbytes)") \
3324 range(0, 1 * M) \
3325 \
3326 product_pd(intx, VMThreadStackSize, \
3327 "Non-Java Thread Stack Size (in Kbytes)") \
3328 range(0, max_intx/(1 * K)) \
3329 \
3330 product_pd(intx, CompilerThreadStackSize, \
3331 "Compiler Thread Stack Size (in Kbytes)") \
3332 range(0, max_intx/(1 * K)) \
3333 \
3334 develop_pd(size_t, JVMInvokeMethodSlack, \
3335 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3336 \
3337 /* code cache parameters */ \
3338 develop_pd(uintx, CodeCacheSegmentSize, \
3339 "Code cache segment size (in bytes) - smallest unit of " \
3340 "allocation") \
3341 range(1, 1024) \
3342 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
3343 \
3344 develop_pd(intx, CodeEntryAlignment, \
3345 "Code entry alignment for generated code (in bytes)") \
3346 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
3347 \
3348 product_pd(intx, OptoLoopAlignment, \
3349 "Align inner loops to zero relative to this modulus") \
3350 range(1, 16) \
3351 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
3352 \
3353 product_pd(uintx, InitialCodeCacheSize, \
3354 "Initial code cache size (in bytes)") \
3355 range(0, max_uintx) \
3356 \
3357 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3358 "Minimum code cache size (in bytes) required to start VM.") \
3359 range(0, max_uintx) \
3360 \
3361 product(bool, SegmentedCodeCache, false, \
3362 "Use a segmented code cache") \
3363 \
3364 product_pd(uintx, ReservedCodeCacheSize, \
3365 "Reserved code cache size (in bytes) - maximum code cache size") \
3366 range(0, max_uintx) \
3367 \
3368 product_pd(uintx, NonProfiledCodeHeapSize, \
3369 "Size of code heap with non-profiled methods (in bytes)") \
3370 range(0, max_uintx) \
3371 \
3372 product_pd(uintx, ProfiledCodeHeapSize, \
3373 "Size of code heap with profiled methods (in bytes)") \
3374 range(0, max_uintx) \
3375 \
3376 product_pd(uintx, NonNMethodCodeHeapSize, \
3377 "Size of code heap with non-nmethods (in bytes)") \
3378 range(0, max_uintx) \
3379 \
3380 product_pd(uintx, CodeCacheExpansionSize, \
3381 "Code cache expansion size (in bytes)") \
3382 range(0, max_uintx) \
3383 \
3384 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
3385 "Minimum number of segments in a code cache block") \
3386 range(1, 100) \
3387 \
3388 notproduct(bool, ExitOnFullCodeCache, false, \
3389 "Exit the VM if we fill the code cache") \
3390 \
3391 product(bool, UseCodeCacheFlushing, true, \
3392 "Remove cold/old nmethods from the code cache") \
3393 \
3394 product(uintx, StartAggressiveSweepingAt, 10, \
3395 "Start aggressive sweeping if X[%] of the code cache is free." \
3396 "Segmented code cache: X[%] of the non-profiled heap." \
3397 "Non-segmented code cache: X[%] of the total code cache") \
3398 range(0, 100) \
3399 \
3400 /* AOT parameters */ \
3401 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \
3402 "Use AOT compiled files") \
3403 \
3404 product(ccstrlist, AOTLibrary, NULL, \
3405 "AOT library") \
3406 \
3407 product(bool, PrintAOT, false, \
3408 "Print used AOT klasses and methods") \
3409 \
3410 notproduct(bool, PrintAOTStatistics, false, \
3411 "Print AOT statistics") \
3412 \
3413 diagnostic(bool, UseAOTStrictLoading, false, \
3414 "Exit the VM if any of the AOT libraries has invalid config") \
3415 \
3416 product(bool, CalculateClassFingerprint, false, \
3417 "Calculate class fingerprint") \
3418 \
3419 /* interpreter debugging */ \
3420 develop(intx, BinarySwitchThreshold, 5, \
3421 "Minimal number of lookupswitch entries for rewriting to binary " \
3422 "switch") \
3423 \
3424 develop(intx, StopInterpreterAt, 0, \
3425 "Stop interpreter execution at specified bytecode number") \
3426 \
3427 develop(intx, TraceBytecodesAt, 0, \
3428 "Trace bytecodes starting with specified bytecode number") \
3429 \
3430 /* compiler interface */ \
3431 develop(intx, CIStart, 0, \
3432 "The id of the first compilation to permit") \
3433 \
3434 develop(intx, CIStop, max_jint, \
3435 "The id of the last compilation to permit") \
3436 \
3437 develop(intx, CIStartOSR, 0, \
3438 "The id of the first osr compilation to permit " \
3439 "(CICountOSR must be on)") \
3440 \
3441 develop(intx, CIStopOSR, max_jint, \
3442 "The id of the last osr compilation to permit " \
3443 "(CICountOSR must be on)") \
3444 \
3445 develop(intx, CIBreakAtOSR, -1, \
3446 "The id of osr compilation to break at") \
3447 \
3448 develop(intx, CIBreakAt, -1, \
3449 "The id of compilation to break at") \
3450 \
3451 product(ccstrlist, CompileOnly, "", \
3452 "List of methods (pkg/class.name) to restrict compilation to") \
3453 \
3454 product(ccstr, CompileCommandFile, NULL, \
3455 "Read compiler commands from this file [.hotspot_compiler]") \
3456 \
3457 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
3458 "Read compiler directives from this file") \
3459 \
3460 product(ccstrlist, CompileCommand, "", \
3461 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3462 \
3463 develop(bool, ReplayCompiles, false, \
3464 "Enable replay of compilations from ReplayDataFile") \
3465 \
3466 product(ccstr, ReplayDataFile, NULL, \
3467 "File containing compilation replay information" \
3468 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3469 \
3470 product(ccstr, InlineDataFile, NULL, \
3471 "File containing inlining replay information" \
3472 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3473 \
3474 develop(intx, ReplaySuppressInitializers, 2, \
3475 "Control handling of class initialization during replay: " \
3476 "0 - don't do anything special; " \
3477 "1 - treat all class initializers as empty; " \
3478 "2 - treat class initializers for application classes as empty; " \
3479 "3 - allow all class initializers to run during bootstrap but " \
3480 " pretend they are empty after starting replay") \
3481 range(0, 3) \
3482 \
3483 develop(bool, ReplayIgnoreInitErrors, false, \
3484 "Ignore exceptions thrown during initialization for replay") \
3485 \
3486 product(bool, DumpReplayDataOnError, true, \
3487 "Record replay data for crashing compiler threads") \
3488 \
3489 product(bool, CICompilerCountPerCPU, false, \
3490 "1 compiler thread for log(N CPUs)") \
3491 \
3492 develop(intx, CIFireOOMAt, -1, \
3493 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3494 "(non-negative value throws OOM after this many CI accesses " \
3495 "in each compile)") \
3496 notproduct(intx, CICrashAt, -1, \
3497 "id of compilation to trigger assert in compiler thread for " \
3498 "the purpose of testing, e.g. generation of replay data") \
3499 notproduct(bool, CIObjectFactoryVerify, false, \
3500 "enable potentially expensive verification in ciObjectFactory") \
3501 \
3502 /* Priorities */ \
3503 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3504 \
3505 product(intx, ThreadPriorityPolicy, 0, \
3506 "0 : Normal. "\
3507 " VM chooses priorities that are appropriate for normal "\
3508 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3509 " to normal native priority. Java priorities below " \
3510 " NORM_PRIORITY map to lower native priority values. On "\
3511 " Windows applications are allowed to use higher native "\
3512 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3513 " not use the highest possible native priority, "\
3514 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3515 " system threads. On Linux thread priorities are ignored "\
3516 " because the OS does not support static priority in "\
3517 " SCHED_OTHER scheduling class which is the only choice for "\
3518 " non-root, non-realtime applications. "\
3519 "1 : Aggressive. "\
3520 " Java thread priorities map over to the entire range of "\
3521 " native thread priorities. Higher Java thread priorities map "\
3522 " to higher native thread priorities. This policy should be "\
3523 " used with care, as sometimes it can cause performance "\
3524 " degradation in the application and/or the entire system. On "\
3525 " Linux this policy requires root privilege.") \
3526 range(0, 1) \
3527 \
3528 product(bool, ThreadPriorityVerbose, false, \
3529 "Print priority changes") \
3530 \
3531 product(intx, CompilerThreadPriority, -1, \
3532 "The native priority at which compiler threads should run " \
3533 "(-1 means no change)") \
3534 range(min_jint, max_jint) \
3535 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
3536 \
3537 product(intx, VMThreadPriority, -1, \
3538 "The native priority at which the VM thread should run " \
3539 "(-1 means no change)") \
3540 range(-1, 127) \
3541 \
3542 product(bool, CompilerThreadHintNoPreempt, true, \
3543 "(Solaris only) Give compiler threads an extra quanta") \
3544 \
3545 product(bool, VMThreadHintNoPreempt, false, \
3546 "(Solaris only) Give VM thread an extra quanta") \
3547 \
3548 product(intx, JavaPriority1_To_OSPriority, -1, \
3549 "Map Java priorities to OS priorities") \
3550 range(-1, 127) \
3551 \
3552 product(intx, JavaPriority2_To_OSPriority, -1, \
3553 "Map Java priorities to OS priorities") \
3554 range(-1, 127) \
3555 \
3556 product(intx, JavaPriority3_To_OSPriority, -1, \
3557 "Map Java priorities to OS priorities") \
3558 range(-1, 127) \
3559 \
3560 product(intx, JavaPriority4_To_OSPriority, -1, \
3561 "Map Java priorities to OS priorities") \
3562 range(-1, 127) \
3563 \
3564 product(intx, JavaPriority5_To_OSPriority, -1, \
3565 "Map Java priorities to OS priorities") \
3566 range(-1, 127) \
3567 \
3568 product(intx, JavaPriority6_To_OSPriority, -1, \
3569 "Map Java priorities to OS priorities") \
3570 range(-1, 127) \
3571 \
3572 product(intx, JavaPriority7_To_OSPriority, -1, \
3573 "Map Java priorities to OS priorities") \
3574 range(-1, 127) \
3575 \
3576 product(intx, JavaPriority8_To_OSPriority, -1, \
3577 "Map Java priorities to OS priorities") \
3578 range(-1, 127) \
3579 \
3580 product(intx, JavaPriority9_To_OSPriority, -1, \
3581 "Map Java priorities to OS priorities") \
3582 range(-1, 127) \
3583 \
3584 product(intx, JavaPriority10_To_OSPriority,-1, \
3585 "Map Java priorities to OS priorities") \
3586 range(-1, 127) \
3587 \
3588 experimental(bool, UseCriticalJavaThreadPriority, false, \
3589 "Java thread priority 10 maps to critical scheduling priority") \
3590 \
3591 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3592 "Compiler thread(s) run at critical scheduling priority") \
3593 \
3594 experimental(bool, UseCriticalCMSThreadPriority, false, \
3595 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3596 \
3597 /* compiler debugging */ \
3598 notproduct(intx, CompileTheWorldStartAt, 1, \
3599 "First class to consider when using +CompileTheWorld") \
3600 \
3601 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3602 "Last class to consider when using +CompileTheWorld") \
3603 \
3604 develop(intx, NewCodeParameter, 0, \
3605 "Testing Only: Create a dedicated integer parameter before " \
3606 "putback") \
3607 \
3608 /* new oopmap storage allocation */ \
3609 develop(intx, MinOopMapAllocation, 8, \
3610 "Minimum number of OopMap entries in an OopMapSet") \
3611 \
3612 /* Background Compilation */ \
3613 develop(intx, LongCompileThreshold, 50, \
3614 "Used with +TraceLongCompiles") \
3615 \
3616 /* recompilation */ \
3617 product_pd(intx, CompileThreshold, \
3618 "number of interpreted method invocations before (re-)compiling") \
3619 constraint(CompileThresholdConstraintFunc, AfterErgo) \
3620 \
3621 product(double, CompileThresholdScaling, 1.0, \
3622 "Factor to control when first compilation happens " \
3623 "(both with and without tiered compilation): " \
3624 "values greater than 1.0 delay counter overflow, " \
3625 "values between 0 and 1.0 rush counter overflow, " \
3626 "value of 1.0 leaves compilation thresholds unchanged " \
3627 "value of 0.0 is equivalent to -Xint. " \
3628 "" \
3629 "Flag can be set as per-method option. " \
3630 "If a value is specified for a method, compilation thresholds " \
3631 "for that method are scaled by both the value of the global flag "\
3632 "and the value of the per-method flag.") \
3633 range(0.0, DBL_MAX) \
3634 \
3635 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3636 "Interpreter (tier 0) invocation notification frequency") \
3637 range(0, 30) \
3638 \
3639 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3640 "C1 without MDO (tier 2) invocation notification frequency") \
3641 range(0, 30) \
3642 \
3643 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3644 "C1 with MDO profiling (tier 3) invocation notification " \
3645 "frequency") \
3646 range(0, 30) \
3647 \
3648 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3649 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3650 range(0, 30) \
3651 \
3652 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3653 "Interpreter (tier 0) invocation notification frequency") \
3654 range(0, 30) \
3655 \
3656 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3657 "C1 without MDO (tier 2) invocation notification frequency") \
3658 range(0, 30) \
3659 \
3660 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3661 "C1 with MDO profiling (tier 3) invocation notification " \
3662 "frequency") \
3663 range(0, 30) \
3664 \
3665 product(intx, Tier2CompileThreshold, 0, \
3666 "threshold at which tier 2 compilation is invoked") \
3667 range(0, max_jint) \
3668 \
3669 product(intx, Tier2BackEdgeThreshold, 0, \
3670 "Back edge threshold at which tier 2 compilation is invoked") \
3671 range(0, max_jint) \
3672 \
3673 product(intx, Tier3InvocationThreshold, 200, \
3674 "Compile if number of method invocations crosses this " \
3675 "threshold") \
3676 range(0, max_jint) \
3677 \
3678 product(intx, Tier3MinInvocationThreshold, 100, \
3679 "Minimum invocation to compile at tier 3") \
3680 range(0, max_jint) \
3681 \
3682 product(intx, Tier3CompileThreshold, 2000, \
3683 "Threshold at which tier 3 compilation is invoked (invocation " \
3684 "minimum must be satisfied)") \
3685 range(0, max_jint) \
3686 \
3687 product(intx, Tier3BackEdgeThreshold, 60000, \
3688 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3689 range(0, max_jint) \
3690 \
3691 product(intx, Tier3AOTInvocationThreshold, 10000, \
3692 "Compile if number of method invocations crosses this " \
3693 "threshold if coming from AOT") \
3694 range(0, max_jint) \
3695 \
3696 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
3697 "Minimum invocation to compile at tier 3 if coming from AOT") \
3698 range(0, max_jint) \
3699 \
3700 product(intx, Tier3AOTCompileThreshold, 15000, \
3701 "Threshold at which tier 3 compilation is invoked (invocation " \
3702 "minimum must be satisfied) if coming from AOT") \
3703 range(0, max_jint) \
3704 \
3705 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
3706 "Back edge threshold at which tier 3 OSR compilation is invoked " \
3707 "if coming from AOT") \
3708 range(0, max_jint) \
3709 \
3710 product(intx, Tier4InvocationThreshold, 5000, \
3711 "Compile if number of method invocations crosses this " \
3712 "threshold") \
3713 range(0, max_jint) \
3714 \
3715 product(intx, Tier4MinInvocationThreshold, 600, \
3716 "Minimum invocation to compile at tier 4") \
3717 range(0, max_jint) \
3718 \
3719 product(intx, Tier4CompileThreshold, 15000, \
3720 "Threshold at which tier 4 compilation is invoked (invocation " \
3721 "minimum must be satisfied") \
3722 range(0, max_jint) \
3723 \
3724 product(intx, Tier4BackEdgeThreshold, 40000, \
3725 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3726 range(0, max_jint) \
3727 \
3728 product(intx, Tier3DelayOn, 5, \
3729 "If C2 queue size grows over this amount per compiler thread " \
3730 "stop compiling at tier 3 and start compiling at tier 2") \
3731 range(0, max_jint) \
3732 \
3733 product(intx, Tier3DelayOff, 2, \
3734 "If C2 queue size is less than this amount per compiler thread " \
3735 "allow methods compiled at tier 2 transition to tier 3") \
3736 range(0, max_jint) \
3737 \
3738 product(intx, Tier3LoadFeedback, 5, \
3739 "Tier 3 thresholds will increase twofold when C1 queue size " \
3740 "reaches this amount per compiler thread") \
3741 range(0, max_jint) \
3742 \
3743 product(intx, Tier4LoadFeedback, 3, \
3744 "Tier 4 thresholds will increase twofold when C2 queue size " \
3745 "reaches this amount per compiler thread") \
3746 range(0, max_jint) \
3747 \
3748 product(intx, TieredCompileTaskTimeout, 50, \
3749 "Kill compile task if method was not used within " \
3750 "given timeout in milliseconds") \
3751 range(0, max_intx) \
3752 \
3753 product(intx, TieredStopAtLevel, 4, \
3754 "Stop at given compilation level") \
3755 range(0, 4) \
3756 \
3757 product(intx, Tier0ProfilingStartPercentage, 200, \
3758 "Start profiling in interpreter if the counters exceed tier 3 " \
3759 "thresholds by the specified percentage") \
3760 range(0, max_jint) \
3761 \
3762 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3763 "Increase the compile threshold for C1 compilation if the code " \
3764 "cache is filled by the specified percentage") \
3765 range(0, 99) \
3766 \
3767 product(intx, TieredRateUpdateMinTime, 1, \
3768 "Minimum rate sampling interval (in milliseconds)") \
3769 range(0, max_intx) \
3770 \
3771 product(intx, TieredRateUpdateMaxTime, 25, \
3772 "Maximum rate sampling interval (in milliseconds)") \
3773 range(0, max_intx) \
3774 \
3775 product_pd(bool, TieredCompilation, \
3776 "Enable tiered compilation") \
3777 \
3778 product(bool, PrintTieredEvents, false, \
3779 "Print tiered events notifications") \
3780 \
3781 product_pd(intx, OnStackReplacePercentage, \
3782 "NON_TIERED number of method invocations/branches (expressed as " \
3783 "% of CompileThreshold) before (re-)compiling OSR code") \
3784 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
3785 \
3786 product(intx, InterpreterProfilePercentage, 33, \
3787 "NON_TIERED number of method invocations/branches (expressed as " \
3788 "% of CompileThreshold) before profiling in the interpreter") \
3789 range(0, 100) \
3790 \
3791 develop(intx, MaxRecompilationSearchLength, 10, \
3792 "The maximum number of frames to inspect when searching for " \
3793 "recompilee") \
3794 \
3795 develop(intx, MaxInterpretedSearchLength, 3, \
3796 "The maximum number of interpreted frames to skip when searching "\
3797 "for recompilee") \
3798 \
3799 develop(intx, DesiredMethodLimit, 8000, \
3800 "The desired maximum method size (in bytecodes) after inlining") \
3801 \
3802 develop(intx, HugeMethodLimit, 8000, \
3803 "Don't compile methods larger than this if " \
3804 "+DontCompileHugeMethods") \
3805 \
3806 /* New JDK 1.4 reflection implementation */ \
3807 \
3808 develop(intx, FastSuperclassLimit, 8, \
3809 "Depth of hardwired instanceof accelerator array") \
3810 \
3811 /* Properties for Java libraries */ \
3812 \
3813 product(uint64_t, MaxDirectMemorySize, 0, \
3814 "Maximum total size of NIO direct-buffer allocations") \
3815 range(0, max_jlong) \
3816 \
3817 /* Flags used for temporary code during development */ \
3818 \
3819 diagnostic(bool, UseNewCode, false, \
3820 "Testing Only: Use the new version while testing") \
3821 \
3822 diagnostic(bool, UseNewCode2, false, \
3823 "Testing Only: Use the new version while testing") \
3824 \
3825 diagnostic(bool, UseNewCode3, false, \
3826 "Testing Only: Use the new version while testing") \
3827 \
3828 /* flags for performance data collection */ \
3829 \
3830 product(bool, UsePerfData, true, \
3831 "Flag to disable jvmstat instrumentation for performance testing "\
3832 "and problem isolation purposes") \
3833 \
3834 product(bool, PerfDataSaveToFile, false, \
3835 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3836 \
3837 product(ccstr, PerfDataSaveFile, NULL, \
3838 "Save PerfData memory to the specified absolute pathname. " \
3839 "The string %p in the file name (if present) " \
3840 "will be replaced by pid") \
3841 \
3842 product(intx, PerfDataSamplingInterval, 50, \
3843 "Data sampling interval (in milliseconds)") \
3844 range(PeriodicTask::min_interval, max_jint) \
3845 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
3846 \
3847 product(bool, PerfDisableSharedMem, false, \
3848 "Store performance data in standard memory") \
3849 \
3850 product(intx, PerfDataMemorySize, 32*K, \
3851 "Size of performance data memory region. Will be rounded " \
3852 "up to a multiple of the native os page size.") \
3853 range(128, 32*64*K) \
3854 \
3855 product(intx, PerfMaxStringConstLength, 1024, \
3856 "Maximum PerfStringConstant string length before truncation") \
3857 range(32, 32*K) \
3858 \
3859 product(bool, PerfAllowAtExitRegistration, false, \
3860 "Allow registration of atexit() methods") \
3861 \
3862 product(bool, PerfBypassFileSystemCheck, false, \
3863 "Bypass Win32 file system criteria checks (Windows Only)") \
3864 \
3865 product(intx, UnguardOnExecutionViolation, 0, \
3866 "Unguard page and retry on no-execute fault (Win32 only) " \
3867 "0=off, 1=conservative, 2=aggressive") \
3868 range(0, 2) \
3869 \
3870 /* Serviceability Support */ \
3871 \
3872 product(bool, ManagementServer, false, \
3873 "Create JMX Management Server") \
3874 \
3875 product(bool, DisableAttachMechanism, false, \
3876 "Disable mechanism that allows tools to attach to this VM") \
3877 \
3878 product(bool, StartAttachListener, false, \
3879 "Always start Attach Listener at VM startup") \
3880 \
3881 product(bool, EnableDynamicAgentLoading, true, \
3882 "Allow tools to load agents with the attach mechanism") \
3883 \
3884 manageable(bool, PrintConcurrentLocks, false, \
3885 "Print java.util.concurrent locks in thread dump") \
3886 \
3887 product(bool, TransmitErrorReport, false, \
3888 "Enable error report transmission on erroneous termination") \
3889 \
3890 product(ccstr, ErrorReportServer, NULL, \
3891 "Override built-in error report server address") \
3892 \
3893 /* Shared spaces */ \
3894 \
3895 product(bool, UseSharedSpaces, true, \
3896 "Use shared spaces for metadata") \
3897 \
3898 product(bool, VerifySharedSpaces, false, \
3899 "Verify shared spaces (false for default archive, true for " \
3900 "archive specified by -XX:SharedArchiveFile)") \
3901 \
3902 product(bool, RequireSharedSpaces, false, \
3903 "Require shared spaces for metadata") \
3904 \
3905 product(bool, DumpSharedSpaces, false, \
3906 "Special mode: JVM reads a class list, loads classes, builds " \
3907 "shared spaces, and dumps the shared spaces to a file to be " \
3908 "used in future JVM runs") \
3909 \
3910 product(bool, PrintSharedArchiveAndExit, false, \
3911 "Print shared archive file contents") \
3912 \
3913 product(bool, PrintSharedDictionary, false, \
3914 "If PrintSharedArchiveAndExit is true, also print the shared " \
3915 "dictionary") \
3916 \
3917 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
3918 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3919 "Address to allocate shared memory region for class data") \
3920 range(0, SIZE_MAX) \
3921 \
3922 product(uintx, SharedSymbolTableBucketSize, 4, \
3923 "Average number of symbols per bucket in shared table") \
3924 range(2, 246) \
3925 \
3926 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \
3927 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3928 "classes. Just exclude them from the shared dictionary.") \
3929 \
3930 diagnostic(bool, PrintMethodHandleStubs, false, \
3931 "Print generated stub code for method handles") \
3932 \
3933 develop(bool, TraceMethodHandles, false, \
3934 "trace internal method handle operations") \
3935 \
3936 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3937 "perform extra checks when constructing method handles") \
3938 \
3939 diagnostic(bool, ShowHiddenFrames, false, \
3940 "show method handle implementation frames (usually hidden)") \
3941 \
3942 experimental(bool, TrustFinalNonStaticFields, false, \
3943 "trust final non-static declarations for constant folding") \
3944 \
3945 diagnostic(bool, FoldStableValues, true, \
3946 "Optimize loads from stable fields (marked w/ @Stable)") \
3947 \
3948 develop(bool, TraceInvokeDynamic, false, \
3949 "trace internal invoke dynamic operations") \
3950 \
3951 diagnostic(bool, PauseAtStartup, false, \
3952 "Causes the VM to pause at startup time and wait for the pause " \
3953 "file to be removed (default: ./vm.paused.<pid>)") \
3954 \
3955 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3956 "The file to create and for whose removal to await when pausing " \
3957 "at startup. (default: ./vm.paused.<pid>)") \
3958 \
3959 diagnostic(bool, PauseAtExit, false, \
3960 "Pause and wait for keypress on exit if a debugger is attached") \
3961 \
3962 product(bool, ExtendedDTraceProbes, false, \
3963 "Enable performance-impacting dtrace probes") \
3964 \
3965 product(bool, DTraceMethodProbes, false, \
3966 "Enable dtrace probes for method-entry and method-exit") \
3967 \
3968 product(bool, DTraceAllocProbes, false, \
3969 "Enable dtrace probes for object allocation") \
3970 \
3971 product(bool, DTraceMonitorProbes, false, \
3972 "Enable dtrace probes for monitor events") \
3973 \
3974 product(bool, RelaxAccessControlCheck, false, \
3975 "Relax the access control checks in the verifier") \
3976 \
3977 product(uintx, StringTableSize, defaultStringTableSize, \
3978 "Number of buckets in the interned String table") \
3979 range(minimumStringTableSize, 111*defaultStringTableSize) \
3980 \
3981 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
3982 "Number of buckets in the JVM internal Symbol table") \
3983 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
3984 \
3985 product(bool, UseStringDeduplication, false, \
3986 "Use string deduplication") \
3987 \
3988 product(uintx, StringDeduplicationAgeThreshold, 3, \
3989 "A string must reach this age (or be promoted to an old region) " \
3990 "to be considered for deduplication") \
3991 range(1, markOopDesc::max_age) \
3992 \
3993 diagnostic(bool, StringDeduplicationResizeALot, false, \
3994 "Force table resize every time the table is scanned") \
3995 \
3996 diagnostic(bool, StringDeduplicationRehashALot, false, \
3997 "Force table rehash every time the table is scanned") \
3998 \
3999 diagnostic(bool, WhiteBoxAPI, false, \
4000 "Enable internal testing APIs") \
4001 \
4002 experimental(intx, SurvivorAlignmentInBytes, 0, \
4003 "Default survivor space alignment in bytes") \
4004 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4005 \
4006 product(bool , AllowNonVirtualCalls, false, \
4007 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4008 \
4009 product(ccstr, DumpLoadedClassList, NULL, \
4010 "Dump the names all loaded classes, that could be stored into " \
4011 "the CDS archive, in the specified file") \
4012 \
4013 product(ccstr, SharedClassListFile, NULL, \
4014 "Override the default CDS class list") \
4015 \
4016 diagnostic(ccstr, SharedArchiveFile, NULL, \
4017 "Override the default location of the CDS archive file") \
4018 \
4019 product(ccstr, ExtraSharedClassListFile, NULL, \
4020 "Extra classlist for building the CDS archive file") \
4021 \
4022 experimental(size_t, ArrayAllocatorMallocLimit, \
4023 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4024 "Allocation less than this value will be allocated " \
4025 "using malloc. Larger allocations will use mmap.") \
4026 \
4027 experimental(bool, AlwaysAtomicAccesses, false, \
4028 "Accesses to all variables should always be atomic") \
4029 \
4030 product(bool, EnableTracing, false, \
4031 "Enable event-based tracing") \
4032 \
4033 product(bool, UseLockedTracing, false, \
4034 "Use locked-tracing when doing event-based tracing") \
4035 \
4036 diagnostic(bool, UseUnalignedAccesses, false, \
4037 "Use unaligned memory accesses in Unsafe") \
4038 \
4039 product_pd(bool, PreserveFramePointer, \
4040 "Use the FP register for holding the frame pointer " \
4041 "and not as a general purpose register.") \
4042 \
4043 diagnostic(bool, CheckIntrinsics, true, \
4044 "When a class C is loaded, check that " \
4045 "(1) all intrinsics defined by the VM for class C are present "\
4046 "in the loaded class file and are marked with the " \
4047 "@HotSpotIntrinsicCandidate annotation, that " \
4048 "(2) there is an intrinsic registered for all loaded methods " \
4049 "that are annotated with the @HotSpotIntrinsicCandidate " \
4050 "annotation, and that " \
4051 "(3) no orphan methods exist for class C (i.e., methods for " \
4052 "which the VM declares an intrinsic but that are not declared "\
4053 "in the loaded class C. " \
4054 "Check (3) is available only in debug builds.") \
4055 \
4056 diagnostic_pd(intx, InitArrayShortSize, \
4057 "Threshold small size (in bytes) for clearing arrays. " \
4058 "Anything this size or smaller may get converted to discrete " \
4059 "scalar stores.") \
4060 range(0, max_intx) \
4061 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
4062 \
4063 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
4064 "Disable backwards compatibility for compile commands.") \
4065 \
4066 diagnostic(bool, CompilerDirectivesPrint, false, \
4067 "Print compiler directives on installation.") \
4068 diagnostic(int, CompilerDirectivesLimit, 50, \
4069 "Limit on number of compiler directives.")
4070
4071
4072 /*
4073 * Macros for factoring of globals
4074 */
4075
4076 // Interface macros
4077 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4078 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4079 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4080 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
4081 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4082 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4083 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4084 #ifdef PRODUCT
4085 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
4086 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
4087 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
4088 #else
4089 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4090 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4091 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4092 #endif // PRODUCT
4093 // Special LP64 flags, product only needed for now.
4094 #ifdef _LP64
4095 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4096 #else
4097 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4098 #endif // _LP64
4099
4100 // Implementation macros
4101 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4102 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4103 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4104 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name;
4105 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4106 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4107 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4108 #ifdef PRODUCT
4109 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4110 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4111 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4112 #else
4113 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4114 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4115 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4116 #endif // PRODUCT
4117 #ifdef _LP64
4118 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4119 #else
4120 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4121 #endif // _LP64
4122
4123 // Only materialize src code for range checking when required, ignore otherwise
4124 #define IGNORE_RANGE(a, b)
4125 // Only materialize src code for contraint checking when required, ignore otherwise
4126 #define IGNORE_CONSTRAINT(func,type)
4127
4128 #define IGNORE_WRITEABLE(type)
4129
4130 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4131 DECLARE_PD_DEVELOPER_FLAG, \
4132 DECLARE_PRODUCT_FLAG, \
4133 DECLARE_PD_PRODUCT_FLAG, \
4134 DECLARE_DIAGNOSTIC_FLAG, \
4135 DECLARE_PD_DIAGNOSTIC_FLAG, \
4136 DECLARE_EXPERIMENTAL_FLAG, \
4137 DECLARE_NOTPRODUCT_FLAG, \
4138 DECLARE_MANAGEABLE_FLAG, \
4139 DECLARE_PRODUCT_RW_FLAG, \
4140 DECLARE_LP64_PRODUCT_FLAG, \
4141 IGNORE_RANGE, \
4142 IGNORE_CONSTRAINT, \
4143 IGNORE_WRITEABLE)
4144
4145 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4146 DECLARE_PD_DEVELOPER_FLAG, \
4147 DECLARE_PRODUCT_FLAG, \
4148 DECLARE_PD_PRODUCT_FLAG, \
4149 DECLARE_DIAGNOSTIC_FLAG, \
4150 DECLARE_PD_DIAGNOSTIC_FLAG, \
4151 DECLARE_NOTPRODUCT_FLAG, \
4152 IGNORE_RANGE, \
4153 IGNORE_CONSTRAINT, \
4154 IGNORE_WRITEABLE)
4155
4156 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4157 DECLARE_PRODUCT_FLAG, \
4158 DECLARE_DIAGNOSTIC_FLAG, \
4159 DECLARE_EXPERIMENTAL_FLAG, \
4160 DECLARE_NOTPRODUCT_FLAG, \
4161 IGNORE_RANGE, \
4162 IGNORE_CONSTRAINT, \
4163 IGNORE_WRITEABLE)
4164
4165 // Extensions
4166
4167 #include "runtime/globals_ext.hpp"
4168
4169 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP