Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/perfData.hpp @ 1706:9d7a8ab3736b
6962589: remove breadth first scanning code from parallel gc
Summary: Remove the breadth-first copying order from ParallelScavenge and use depth-first by default.
Reviewed-by: jcoomes, ysr, johnc
author | tonyp |
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date | Thu, 22 Jul 2010 10:27:41 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 /* jvmstat global and subsystem counter name space - enumeration value | |
26 * serve as an index into the PerfDataManager::_name_space[] array | |
27 * containing the corresponding name space string. Only the top level | |
28 * subsystem name spaces are represented here. | |
29 */ | |
30 enum CounterNS { | |
31 // top level name spaces | |
32 JAVA_NS, | |
33 COM_NS, | |
34 SUN_NS, | |
35 // subsystem name spaces | |
36 JAVA_GC, // Garbage Collection name spaces | |
37 COM_GC, | |
38 SUN_GC, | |
39 JAVA_CI, // Compiler name spaces | |
40 COM_CI, | |
41 SUN_CI, | |
42 JAVA_CLS, // Class Loader name spaces | |
43 COM_CLS, | |
44 SUN_CLS, | |
45 JAVA_RT, // Runtime name spaces | |
46 COM_RT, | |
47 SUN_RT, | |
48 JAVA_OS, // Operating System name spaces | |
49 COM_OS, | |
50 SUN_OS, | |
51 JAVA_THREADS, // Threads System name spaces | |
52 COM_THREADS, | |
53 SUN_THREADS, | |
54 JAVA_PROPERTY, // Java Property name spaces | |
55 COM_PROPERTY, | |
56 SUN_PROPERTY, | |
57 NULL_NS, | |
58 COUNTERNS_LAST = NULL_NS | |
59 }; | |
60 | |
61 /* | |
62 * Classes to support access to production performance data | |
63 * | |
64 * The PerfData class structure is provided for creation, access, and update | |
65 * of performance data (a.k.a. instrumentation) in a specific memory region | |
66 * which is possibly accessible as shared memory. Although not explicitly | |
67 * prevented from doing so, developers should not use the values returned | |
68 * by accessor methods to make algorithmic decisions as they are potentially | |
69 * extracted from a shared memory region. Although any shared memory region | |
70 * created is with appropriate access restrictions, allowing read-write access | |
71 * only to the principal that created the JVM, it is believed that a the | |
72 * shared memory region facilitates an easier attack path than attacks | |
73 * launched through mechanisms such as /proc. For this reason, it is | |
74 * recommended that data returned by PerfData accessor methods be used | |
75 * cautiously. | |
76 * | |
77 * There are three variability classifications of performance data | |
78 * Constants - value is written to the PerfData memory once, on creation | |
79 * Variables - value is modifiable, with no particular restrictions | |
80 * Counters - value is monotonically changing (increasing or decreasing) | |
81 * | |
82 * The performance data items can also have various types. The class | |
83 * hierarchy and the structure of the memory region are designed to | |
84 * accommodate new types as they are needed. Types are specified in | |
85 * terms of Java basic types, which accommodates client applications | |
86 * written in the Java programming language. The class hierarchy is: | |
87 * | |
88 * - PerfData (Abstract) | |
89 * - PerfLong (Abstract) | |
90 * - PerfLongConstant (alias: PerfConstant) | |
91 * - PerfLongVariant (Abstract) | |
92 * - PerfLongVariable (alias: PerfVariable) | |
93 * - PerfLongCounter (alias: PerfCounter) | |
94 * | |
95 * - PerfByteArray (Abstract) | |
96 * - PerfString (Abstract) | |
97 * - PerfStringVariable | |
98 * - PerfStringConstant | |
99 * | |
100 * | |
101 * As seen in the class hierarchy, the initially supported types are: | |
102 * | |
103 * Long - performance data holds a Java long type | |
104 * ByteArray - performance data holds an array of Java bytes | |
105 * used for holding C++ char arrays. | |
106 * | |
107 * The String type is derived from the ByteArray type. | |
108 * | |
109 * A PerfData subtype is not required to provide an implementation for | |
110 * each variability classification. For example, the String type provides | |
111 * Variable and Constant variablility classifications in the PerfStringVariable | |
112 * and PerfStringConstant classes, but does not provide a counter type. | |
113 * | |
114 * Performance data are also described by a unit of measure. Units allow | |
115 * client applications to make reasonable decisions on how to treat | |
116 * performance data generically, preventing the need to hard-code the | |
117 * specifics of a particular data item in client applications. The current | |
118 * set of units are: | |
119 * | |
120 * None - the data has no units of measure | |
121 * Bytes - data is measured in bytes | |
122 * Ticks - data is measured in clock ticks | |
123 * Events - data is measured in events. For example, | |
124 * the number of garbage collection events or the | |
125 * number of methods compiled. | |
126 * String - data is not numerical. For example, | |
127 * the java command line options | |
128 * Hertz - data is a frequency | |
129 * | |
130 * The performance counters also provide a support attribute, indicating | |
131 * the stability of the counter as a programmatic interface. The support | |
132 * level is also implied by the name space in which the counter is created. | |
133 * The counter name space support conventions follow the Java package, class, | |
134 * and property support conventions: | |
135 * | |
136 * java.* - stable, supported interface | |
137 * com.sun.* - unstable, supported interface | |
138 * sun.* - unstable, unsupported interface | |
139 * | |
140 * In the above context, unstable is a measure of the interface support | |
141 * level, not the implementation stability level. | |
142 * | |
143 * Currently, instances of PerfData subtypes are considered to have | |
144 * a life time equal to that of the VM and are managed by the | |
145 * PerfDataManager class. All constructors for the PerfData class and | |
146 * its subtypes have protected constructors. Creation of PerfData | |
147 * instances is performed by invoking various create methods on the | |
148 * PerfDataManager class. Users should not attempt to delete these | |
149 * instances as the PerfDataManager class expects to perform deletion | |
150 * operations on exit of the VM. | |
151 * | |
152 * Examples: | |
153 * | |
154 * Creating performance counter that holds a monotonically increasing | |
155 * long data value with units specified in U_Bytes in the "java.gc.*" | |
156 * name space. | |
157 * | |
158 * PerfLongCounter* foo_counter; | |
159 * | |
160 * foo_counter = PerfDataManager::create_long_counter(JAVA_GC, "foo", | |
161 * PerfData::U_Bytes, | |
162 * optionalInitialValue, | |
163 * CHECK); | |
164 * foo_counter->inc(); | |
165 * | |
166 * Creating a performance counter that holds a variably change long | |
167 * data value with untis specified in U_Bytes in the "com.sun.ci | |
168 * name space. | |
169 * | |
170 * PerfLongVariable* bar_varible; | |
171 * bar_variable = PerfDataManager::create_long_variable(COM_CI, "bar", | |
172 .* PerfData::U_Bytes, | |
173 * optionalInitialValue, | |
174 * CHECK); | |
175 * | |
176 * bar_variable->inc(); | |
177 * bar_variable->set_value(0); | |
178 * | |
179 * Creating a performance counter that holds a constant string value in | |
180 * the "sun.cls.*" name space. | |
181 * | |
182 * PerfDataManager::create_string_constant(SUN_CLS, "foo", string, CHECK); | |
183 * | |
184 * Although the create_string_constant() factory method returns a pointer | |
185 * to the PerfStringConstant object, it can safely be ignored. Developers | |
186 * are not encouraged to access the string constant's value via this | |
187 * pointer at this time due to security concerns. | |
188 * | |
189 * Creating a performance counter in an arbitrary name space that holds a | |
190 * value that is sampled by the StatSampler periodic task. | |
191 * | |
192 * PerfDataManager::create_counter("foo.sampled", PerfData::U_Events, | |
193 * &my_jlong, CHECK); | |
194 * | |
195 * In this example, the PerfData pointer can be ignored as the caller | |
196 * is relying on the StatSampler PeriodicTask to sample the given | |
197 * address at a regular interval. The interval is defined by the | |
198 * PerfDataSamplingInterval global variable, and is applyied on | |
199 * a system wide basis, not on an per-counter basis. | |
200 * | |
201 * Creating a performance counter in an arbitrary name space that utilizes | |
202 * a helper object to return a value to the StatSampler via the take_sample() | |
203 * method. | |
204 * | |
205 * class MyTimeSampler : public PerfLongSampleHelper { | |
206 * public: | |
207 * jlong take_sample() { return os::elapsed_counter(); } | |
208 * }; | |
209 * | |
210 * PerfDataManager::create_counter(SUN_RT, "helped", | |
211 * PerfData::U_Ticks, | |
212 * new MyTimeSampler(), CHECK); | |
213 * | |
214 * In this example, a subtype of PerfLongSampleHelper is instantiated | |
215 * and its take_sample() method is overridden to perform whatever | |
216 * operation is necessary to generate the data sample. This method | |
217 * will be called by the StatSampler at a regular interval, defined | |
218 * by the PerfDataSamplingInterval global variable. | |
219 * | |
220 * As before, PerfSampleHelper is an alias for PerfLongSampleHelper. | |
221 * | |
222 * For additional uses of PerfData subtypes, see the utility classes | |
223 * PerfTraceTime and PerfTraceTimedEvent below. | |
224 * | |
225 * Always-on non-sampled counters can be created independent of | |
226 * the UsePerfData flag. Counters will be created on the c-heap | |
227 * if UsePerfData is false. | |
228 * | |
229 * Until further noice, all PerfData objects should be created and | |
230 * manipulated within a guarded block. The guard variable is | |
231 * UsePerfData, a product flag set to true by default. This flag may | |
232 * be removed from the product in the future. | |
233 * | |
234 */ | |
235 class PerfData : public CHeapObj { | |
236 | |
237 friend class StatSampler; // for access to protected void sample() | |
238 friend class PerfDataManager; // for access to protected destructor | |
239 | |
240 public: | |
241 | |
242 // the Variability enum must be kept in synchronization with the | |
243 // the com.sun.hotspot.perfdata.Variability class | |
244 enum Variability { | |
245 V_Constant = 1, | |
246 V_Monotonic = 2, | |
247 V_Variable = 3, | |
248 V_last = V_Variable | |
249 }; | |
250 | |
251 // the Units enum must be kept in synchronization with the | |
252 // the com.sun.hotspot.perfdata.Units class | |
253 enum Units { | |
254 U_None = 1, | |
255 U_Bytes = 2, | |
256 U_Ticks = 3, | |
257 U_Events = 4, | |
258 U_String = 5, | |
259 U_Hertz = 6, | |
260 U_Last = U_Hertz | |
261 }; | |
262 | |
263 // Miscellaneous flags | |
264 enum Flags { | |
265 F_None = 0x0, | |
266 F_Supported = 0x1 // interface is supported - java.* and com.sun.* | |
267 }; | |
268 | |
269 private: | |
270 char* _name; | |
271 Variability _v; | |
272 Units _u; | |
273 bool _on_c_heap; | |
274 Flags _flags; | |
275 | |
276 PerfDataEntry* _pdep; | |
277 | |
278 protected: | |
279 | |
280 void *_valuep; | |
281 | |
282 PerfData(CounterNS ns, const char* name, Units u, Variability v); | |
283 ~PerfData(); | |
284 | |
285 // create the entry for the PerfData item in the PerfData memory region. | |
286 // this region is maintained separately from the PerfData objects to | |
287 // facilitate its use by external processes. | |
288 void create_entry(BasicType dtype, size_t dsize, size_t dlen = 0); | |
289 | |
290 // sample the data item given at creation time and write its value | |
291 // into the its corresponding PerfMemory location. | |
292 virtual void sample() = 0; | |
293 | |
294 public: | |
295 | |
296 // returns a boolean indicating the validity of this object. | |
297 // the object is valid if and only if memory in PerfMemory | |
298 // region was successfully allocated. | |
299 inline bool is_valid() { return _valuep != NULL; } | |
300 | |
301 // returns a boolean indicating whether the underlying object | |
302 // was allocated in the PerfMemory region or on the C heap. | |
303 inline bool is_on_c_heap() { return _on_c_heap; } | |
304 | |
305 // returns a pointer to a char* containing the name of the item. | |
306 // The pointer returned is the pointer to a copy of the name | |
307 // passed to the constructor, not the pointer to the name in the | |
308 // PerfData memory region. This redundancy is maintained for | |
309 // security reasons as the PerfMemory region may be in shared | |
310 // memory. | |
311 const char* name() { return _name; } | |
312 | |
313 // returns the variability classification associated with this item | |
314 Variability variability() { return _v; } | |
315 | |
316 // returns the units associated with this item. | |
317 Units units() { return _u; } | |
318 | |
319 // returns the flags associated with this item. | |
320 Flags flags() { return _flags; } | |
321 | |
322 // returns the address of the data portion of the item in the | |
323 // PerfData memory region. | |
324 inline void* get_address() { return _valuep; } | |
325 | |
326 // returns the value of the data portion of the item in the | |
327 // PerfData memory region formatted as a string. | |
328 virtual int format(char* cp, int length) = 0; | |
329 }; | |
330 | |
331 /* | |
332 * PerfLongSampleHelper, and its alias PerfSamplerHelper, is a base class | |
333 * for helper classes that rely upon the StatSampler periodic task to | |
334 * invoke the take_sample() method and write the value returned to its | |
335 * appropriate location in the PerfData memory region. | |
336 */ | |
337 class PerfLongSampleHelper : public CHeapObj { | |
338 public: | |
339 virtual jlong take_sample() = 0; | |
340 }; | |
341 | |
342 typedef PerfLongSampleHelper PerfSampleHelper; | |
343 | |
344 | |
345 /* | |
346 * PerfLong is the base class for the various Long PerfData subtypes. | |
347 * it contains implementation details that are common among its derived | |
348 * types. | |
349 */ | |
350 class PerfLong : public PerfData { | |
351 | |
352 protected: | |
353 | |
354 PerfLong(CounterNS ns, const char* namep, Units u, Variability v); | |
355 | |
356 public: | |
357 int format(char* buffer, int length); | |
358 | |
359 // returns the value of the data portion of the item in the | |
360 // PerfData memory region. | |
361 inline jlong get_value() { return *(jlong*)_valuep; } | |
362 }; | |
363 | |
364 /* | |
365 * The PerfLongConstant class, and its alias PerfConstant, implement | |
366 * a PerfData subtype that holds a jlong data value that is set upon | |
367 * creation of an instance of this class. This class provides no | |
368 * methods for changing the data value stored in PerfData memory region. | |
369 */ | |
370 class PerfLongConstant : public PerfLong { | |
371 | |
372 friend class PerfDataManager; // for access to protected constructor | |
373 | |
374 private: | |
375 // hide sample() - no need to sample constants | |
376 void sample() { } | |
377 | |
378 protected: | |
379 | |
380 PerfLongConstant(CounterNS ns, const char* namep, Units u, | |
381 jlong initial_value=0) | |
382 : PerfLong(ns, namep, u, V_Constant) { | |
383 | |
384 if (is_valid()) *(jlong*)_valuep = initial_value; | |
385 } | |
386 }; | |
387 | |
388 typedef PerfLongConstant PerfConstant; | |
389 | |
390 /* | |
391 * The PerfLongVariant class, and its alias PerfVariant, implement | |
392 * a PerfData subtype that holds a jlong data value that can be modified | |
393 * in an unrestricted manner. This class provides the implementation details | |
394 * for common functionality among its derived types. | |
395 */ | |
396 class PerfLongVariant : public PerfLong { | |
397 | |
398 protected: | |
399 jlong* _sampled; | |
400 PerfLongSampleHelper* _sample_helper; | |
401 | |
402 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
403 jlong initial_value=0) | |
404 : PerfLong(ns, namep, u, v) { | |
405 if (is_valid()) *(jlong*)_valuep = initial_value; | |
406 } | |
407 | |
408 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
409 jlong* sampled); | |
410 | |
411 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
412 PerfLongSampleHelper* sample_helper); | |
413 | |
414 void sample(); | |
415 | |
416 public: | |
417 inline void inc() { (*(jlong*)_valuep)++; } | |
418 inline void inc(jlong val) { (*(jlong*)_valuep) += val; } | |
419 inline void add(jlong val) { (*(jlong*)_valuep) += val; } | |
420 }; | |
421 | |
422 /* | |
423 * The PerfLongCounter class, and its alias PerfCounter, implement | |
424 * a PerfData subtype that holds a jlong data value that can (should) | |
425 * be modified in a monotonic manner. The inc(jlong) and add(jlong) | |
426 * methods can be passed negative values to implement a monotonically | |
427 * decreasing value. However, we rely upon the programmer to honor | |
428 * the notion that this counter always moves in the same direction - | |
429 * either increasing or decreasing. | |
430 */ | |
431 class PerfLongCounter : public PerfLongVariant { | |
432 | |
433 friend class PerfDataManager; // for access to protected constructor | |
434 | |
435 protected: | |
436 | |
437 PerfLongCounter(CounterNS ns, const char* namep, Units u, | |
438 jlong initial_value=0) | |
439 : PerfLongVariant(ns, namep, u, V_Monotonic, | |
440 initial_value) { } | |
441 | |
442 PerfLongCounter(CounterNS ns, const char* namep, Units u, jlong* sampled) | |
443 : PerfLongVariant(ns, namep, u, V_Monotonic, sampled) { } | |
444 | |
445 PerfLongCounter(CounterNS ns, const char* namep, Units u, | |
446 PerfLongSampleHelper* sample_helper) | |
447 : PerfLongVariant(ns, namep, u, V_Monotonic, | |
448 sample_helper) { } | |
449 }; | |
450 | |
451 typedef PerfLongCounter PerfCounter; | |
452 | |
453 /* | |
454 * The PerfLongVariable class, and its alias PerfVariable, implement | |
455 * a PerfData subtype that holds a jlong data value that can | |
456 * be modified in an unrestricted manner. | |
457 */ | |
458 class PerfLongVariable : public PerfLongVariant { | |
459 | |
460 friend class PerfDataManager; // for access to protected constructor | |
461 | |
462 protected: | |
463 | |
464 PerfLongVariable(CounterNS ns, const char* namep, Units u, | |
465 jlong initial_value=0) | |
466 : PerfLongVariant(ns, namep, u, V_Variable, | |
467 initial_value) { } | |
468 | |
469 PerfLongVariable(CounterNS ns, const char* namep, Units u, jlong* sampled) | |
470 : PerfLongVariant(ns, namep, u, V_Variable, sampled) { } | |
471 | |
472 PerfLongVariable(CounterNS ns, const char* namep, Units u, | |
473 PerfLongSampleHelper* sample_helper) | |
474 : PerfLongVariant(ns, namep, u, V_Variable, | |
475 sample_helper) { } | |
476 | |
477 public: | |
478 inline void set_value(jlong val) { (*(jlong*)_valuep) = val; } | |
479 }; | |
480 | |
481 typedef PerfLongVariable PerfVariable; | |
482 | |
483 /* | |
484 * The PerfByteArray provides a PerfData subtype that allows the creation | |
485 * of a contiguous region of the PerfData memory region for storing a vector | |
486 * of bytes. This class is currently intended to be a base class for | |
487 * the PerfString class, and cannot be instantiated directly. | |
488 */ | |
489 class PerfByteArray : public PerfData { | |
490 | |
491 protected: | |
492 jint _length; | |
493 | |
494 PerfByteArray(CounterNS ns, const char* namep, Units u, Variability v, | |
495 jint length); | |
496 }; | |
497 | |
498 class PerfString : public PerfByteArray { | |
499 | |
500 protected: | |
501 | |
502 void set_string(const char* s2); | |
503 | |
504 PerfString(CounterNS ns, const char* namep, Variability v, jint length, | |
505 const char* initial_value) | |
506 : PerfByteArray(ns, namep, U_String, v, length) { | |
507 if (is_valid()) set_string(initial_value); | |
508 } | |
509 | |
510 public: | |
511 | |
512 int format(char* buffer, int length); | |
513 }; | |
514 | |
515 /* | |
516 * The PerfStringConstant class provides a PerfData sub class that | |
517 * allows a null terminated string of single byte characters to be | |
518 * stored in the PerfData memory region. | |
519 */ | |
520 class PerfStringConstant : public PerfString { | |
521 | |
522 friend class PerfDataManager; // for access to protected constructor | |
523 | |
524 private: | |
525 | |
526 // hide sample() - no need to sample constants | |
527 void sample() { } | |
528 | |
529 protected: | |
530 | |
531 // Restrict string constant lengths to be <= PerfMaxStringConstLength. | |
532 // This prevents long string constants, as can occur with very | |
533 // long classpaths or java command lines, from consuming too much | |
534 // PerfData memory. | |
535 PerfStringConstant(CounterNS ns, const char* namep, | |
536 const char* initial_value); | |
537 }; | |
538 | |
539 /* | |
540 * The PerfStringVariable class provides a PerfData sub class that | |
541 * allows a null terminated string of single byte character data | |
542 * to be stored in PerfData memory region. The string value can be reset | |
543 * after initialization. If the string value is >= max_length, then | |
544 * it will be truncated to max_length characters. The copied string | |
545 * is always null terminated. | |
546 */ | |
547 class PerfStringVariable : public PerfString { | |
548 | |
549 friend class PerfDataManager; // for access to protected constructor | |
550 | |
551 protected: | |
552 | |
553 // sampling of string variables are not yet supported | |
554 void sample() { } | |
555 | |
556 PerfStringVariable(CounterNS ns, const char* namep, jint max_length, | |
557 const char* initial_value) | |
558 : PerfString(ns, namep, V_Variable, max_length+1, | |
559 initial_value) { } | |
560 | |
561 public: | |
562 inline void set_value(const char* val) { set_string(val); } | |
563 }; | |
564 | |
565 | |
566 /* | |
567 * The PerfDataList class is a container class for managing lists | |
568 * of PerfData items. The intention of this class is to allow for | |
569 * alternative implementations for management of list of PerfData | |
570 * items without impacting the code that uses the lists. | |
571 * | |
572 * The initial implementation is based upon GrowableArray. Searches | |
573 * on GrowableArray types is linear in nature and this may become | |
574 * a performance issue for creation of PerfData items, particularly | |
575 * from Java code where a test for existence is implemented as a | |
576 * search over all existing PerfData items. | |
577 * | |
578 * The abstraction is not complete. A more general container class | |
579 * would provide an Iterator abstraction that could be used to | |
580 * traverse the lists. This implementation still relys upon integer | |
581 * iterators and the at(int index) method. However, the GrowableArray | |
582 * is not directly visible outside this class and can be replaced by | |
583 * some other implementation, as long as that implementation provides | |
584 * a mechanism to iterate over the container by index. | |
585 */ | |
586 class PerfDataList : public CHeapObj { | |
587 | |
588 private: | |
589 | |
590 // GrowableArray implementation | |
591 typedef GrowableArray<PerfData*> PerfDataArray; | |
592 | |
593 PerfDataArray* _set; | |
594 | |
595 // method to search for a instrumentation object by name | |
596 static bool by_name(void* name, PerfData* pd); | |
597 | |
598 protected: | |
599 // we expose the implementation here to facilitate the clone | |
600 // method. | |
601 PerfDataArray* get_impl() { return _set; } | |
602 | |
603 public: | |
604 | |
605 // create a PerfDataList with the given initial length | |
606 PerfDataList(int length); | |
607 | |
608 // create a PerfDataList as a shallow copy of the given PerfDataList | |
609 PerfDataList(PerfDataList* p); | |
610 | |
611 ~PerfDataList(); | |
612 | |
613 // return the PerfData item indicated by name, | |
614 // or NULL if it doesn't exist. | |
615 PerfData* find_by_name(const char* name); | |
616 | |
617 // return true if a PerfData item with the name specified in the | |
618 // argument exists, otherwise return false. | |
619 bool contains(const char* name) { return find_by_name(name) != NULL; } | |
620 | |
621 // return the number of PerfData items in this list | |
622 int length() { return _set->length(); } | |
623 | |
624 // add a PerfData item to this list | |
625 void append(PerfData *p) { _set->append(p); } | |
626 | |
627 // remove the given PerfData item from this list. When called | |
628 // while iterating over the list, this method will result in a | |
629 // change in the length of the container. The at(int index) | |
630 // method is also impacted by this method as elements with an | |
631 // index greater than the index of the element removed by this | |
632 // method will be shifted down by one. | |
633 void remove(PerfData *p) { _set->remove(p); } | |
634 | |
635 // create a new PerfDataList from this list. The new list is | |
636 // a shallow copy of the original list and care should be taken | |
637 // with respect to delete operations on the elements of the list | |
638 // as the are likely in use by another copy of the list. | |
639 PerfDataList* clone(); | |
640 | |
641 // for backward compatibility with GrowableArray - need to implement | |
642 // some form of iterator to provide a cleaner abstraction for | |
643 // iteration over the container. | |
644 PerfData* at(int index) { return _set->at(index); } | |
645 }; | |
646 | |
647 | |
648 /* | |
649 * The PerfDataManager class is responsible for creating PerfData | |
650 * subtypes via a set a factory methods and for managing lists | |
651 * of the various PerfData types. | |
652 */ | |
653 class PerfDataManager : AllStatic { | |
654 | |
655 friend class StatSampler; // for access to protected PerfDataList methods | |
656 | |
657 private: | |
658 static PerfDataList* _all; | |
659 static PerfDataList* _sampled; | |
660 static PerfDataList* _constants; | |
661 static const char* _name_spaces[]; | |
662 | |
663 // add a PerfData item to the list(s) of know PerfData objects | |
664 static void add_item(PerfData* p, bool sampled); | |
665 | |
666 protected: | |
667 // return the list of all known PerfData items | |
668 static PerfDataList* all(); | |
669 static int count() { return _all->length(); } | |
670 | |
671 // return the list of all known PerfData items that are to be | |
672 // sampled by the StatSampler. | |
673 static PerfDataList* sampled(); | |
674 static int sampled_count() { return _sampled->length(); } | |
675 | |
676 // return the list of all known PerfData items that have a | |
677 // variability classification of type Constant | |
678 static PerfDataList* constants(); | |
679 static int constants_count() { return _constants->length(); } | |
680 | |
681 public: | |
682 | |
683 // method to check for the existence of a PerfData item with | |
684 // the given name. | |
685 static bool exists(const char* name) { return _all->contains(name); } | |
686 | |
687 // method to map a CounterNS enumeration to a namespace string | |
688 static const char* ns_to_string(CounterNS ns) { | |
689 return _name_spaces[ns]; | |
690 } | |
691 | |
692 // methods to test the interface stability of a given counter namespace | |
693 // | |
694 static bool is_stable_supported(CounterNS ns) { | |
695 return (ns != NULL_NS) && ((ns % 3) == JAVA_NS); | |
696 } | |
697 static bool is_unstable_supported(CounterNS ns) { | |
698 return (ns != NULL_NS) && ((ns % 3) == COM_NS); | |
699 } | |
700 static bool is_unstable_unsupported(CounterNS ns) { | |
701 return (ns == NULL_NS) || ((ns % 3) == SUN_NS); | |
702 } | |
703 | |
704 // methods to test the interface stability of a given counter name | |
705 // | |
706 static bool is_stable_supported(const char* name) { | |
707 const char* javadot = "java."; | |
708 return strncmp(name, javadot, strlen(javadot)) == 0; | |
709 } | |
710 static bool is_unstable_supported(const char* name) { | |
711 const char* comdot = "com.sun."; | |
712 return strncmp(name, comdot, strlen(comdot)) == 0; | |
713 } | |
714 static bool is_unstable_unsupported(const char* name) { | |
715 return !(is_stable_supported(name) && is_unstable_supported(name)); | |
716 } | |
717 | |
718 // method to construct counter name strings in a given name space. | |
719 // The string object is allocated from the Resource Area and calls | |
720 // to this method must be made within a ResourceMark. | |
721 // | |
722 static char* counter_name(const char* name_space, const char* name); | |
723 | |
724 // method to construct name space strings in a given name space. | |
725 // The string object is allocated from the Resource Area and calls | |
726 // to this method must be made within a ResourceMark. | |
727 // | |
728 static char* name_space(const char* name_space, const char* sub_space) { | |
729 return counter_name(name_space, sub_space); | |
730 } | |
731 | |
732 // same as above, but appends the instance number to the name space | |
733 // | |
734 static char* name_space(const char* name_space, const char* sub_space, | |
735 int instance); | |
736 static char* name_space(const char* name_space, int instance); | |
737 | |
738 | |
739 // these methods provide the general interface for creating | |
740 // performance data resources. The types of performance data | |
741 // resources can be extended by adding additional create<type> | |
742 // methods. | |
743 | |
744 // Constant Types | |
745 static PerfStringConstant* create_string_constant(CounterNS ns, | |
746 const char* name, | |
747 const char *s, TRAPS); | |
748 | |
749 static PerfLongConstant* create_long_constant(CounterNS ns, | |
750 const char* name, | |
751 PerfData::Units u, | |
752 jlong val, TRAPS); | |
753 | |
754 | |
755 // Variable Types | |
756 static PerfStringVariable* create_string_variable(CounterNS ns, | |
757 const char* name, | |
758 int max_length, | |
759 const char *s, TRAPS); | |
760 | |
761 static PerfStringVariable* create_string_variable(CounterNS ns, | |
762 const char* name, | |
763 const char *s, TRAPS) { | |
764 return create_string_variable(ns, name, 0, s, CHECK_NULL); | |
765 }; | |
766 | |
767 static PerfLongVariable* create_long_variable(CounterNS ns, | |
768 const char* name, | |
769 PerfData::Units u, | |
770 jlong ival, TRAPS); | |
771 | |
772 static PerfLongVariable* create_long_variable(CounterNS ns, | |
773 const char* name, | |
774 PerfData::Units u, TRAPS) { | |
775 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); | |
776 }; | |
777 | |
778 static PerfLongVariable* create_long_variable(CounterNS, const char* name, | |
779 PerfData::Units u, | |
780 jlong* sp, TRAPS); | |
781 | |
782 static PerfLongVariable* create_long_variable(CounterNS ns, | |
783 const char* name, | |
784 PerfData::Units u, | |
785 PerfLongSampleHelper* sh, | |
786 TRAPS); | |
787 | |
788 | |
789 // Counter Types | |
790 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
791 PerfData::Units u, | |
792 jlong ival, TRAPS); | |
793 | |
794 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
795 PerfData::Units u, TRAPS) { | |
796 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); | |
797 }; | |
798 | |
799 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
800 PerfData::Units u, jlong* sp, | |
801 TRAPS); | |
802 | |
803 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
804 PerfData::Units u, | |
805 PerfLongSampleHelper* sh, | |
806 TRAPS); | |
807 | |
808 | |
809 // these creation methods are provided for ease of use. These allow | |
810 // Long performance data types to be created with a shorthand syntax. | |
811 | |
812 static PerfConstant* create_constant(CounterNS ns, const char* name, | |
813 PerfData::Units u, jlong val, TRAPS) { | |
814 return create_long_constant(ns, name, u, val, CHECK_NULL); | |
815 } | |
816 | |
817 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
818 PerfData::Units u, jlong ival, TRAPS) { | |
819 return create_long_variable(ns, name, u, ival, CHECK_NULL); | |
820 } | |
821 | |
822 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
823 PerfData::Units u, TRAPS) { | |
824 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); | |
825 } | |
826 | |
827 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
828 PerfData::Units u, jlong* sp, TRAPS) { | |
829 return create_long_variable(ns, name, u, sp, CHECK_NULL); | |
830 } | |
831 | |
832 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
833 PerfData::Units u, | |
834 PerfSampleHelper* sh, TRAPS) { | |
835 return create_long_variable(ns, name, u, sh, CHECK_NULL); | |
836 } | |
837 | |
838 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
839 PerfData::Units u, jlong ival, TRAPS) { | |
840 return create_long_counter(ns, name, u, ival, CHECK_NULL); | |
841 } | |
842 | |
843 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
844 PerfData::Units u, TRAPS) { | |
845 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); | |
846 } | |
847 | |
848 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
849 PerfData::Units u, jlong* sp, TRAPS) { | |
850 return create_long_counter(ns, name, u, sp, CHECK_NULL); | |
851 } | |
852 | |
853 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
854 PerfData::Units u, | |
855 PerfSampleHelper* sh, TRAPS) { | |
856 return create_long_counter(ns, name, u, sh, CHECK_NULL); | |
857 } | |
858 | |
859 static void destroy(); | |
860 }; | |
861 | |
862 // Useful macros to create the performance counters | |
863 #define NEWPERFTICKCOUNTER(counter, counter_ns, counter_name) \ | |
864 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ | |
865 PerfData::U_Ticks,CHECK);} | |
866 | |
867 #define NEWPERFEVENTCOUNTER(counter, counter_ns, counter_name) \ | |
868 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ | |
869 PerfData::U_Events,CHECK);} | |
870 | |
875
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871 #define NEWPERFBYTECOUNTER(counter, counter_ns, counter_name) \ |
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872 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ |
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873 PerfData::U_Bytes,CHECK);} |
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874 |
0 | 875 // Utility Classes |
876 | |
877 /* | |
878 * this class will administer a PerfCounter used as a time accumulator | |
879 * for a basic block much like the TraceTime class. | |
880 * | |
881 * Example: | |
882 * | |
883 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, 0LL, CHECK); | |
884 * | |
885 * { | |
886 * PerfTraceTime ptt(my_time_counter); | |
887 * // perform the operation you want to measure | |
888 * } | |
889 * | |
890 * Note: use of this class does not need to occur within a guarded | |
891 * block. The UsePerfData guard is used with the implementation | |
892 * of this class. | |
893 */ | |
894 class PerfTraceTime : public StackObj { | |
895 | |
896 protected: | |
897 elapsedTimer _t; | |
898 PerfLongCounter* _timerp; | |
899 // pointer to thread-local or global recursion counter variable | |
900 int* _recursion_counter; | |
901 | |
902 public: | |
903 inline PerfTraceTime(PerfLongCounter* timerp) : _timerp(timerp), _recursion_counter(NULL) { | |
904 if (!UsePerfData) return; | |
905 _t.start(); | |
906 } | |
907 | |
908 inline PerfTraceTime(PerfLongCounter* timerp, int* recursion_counter) : _timerp(timerp), _recursion_counter(recursion_counter) { | |
909 if (!UsePerfData || (_recursion_counter != NULL && | |
910 (*_recursion_counter)++ > 0)) return; | |
911 _t.start(); | |
912 } | |
913 | |
914 inline void suspend() { if (!UsePerfData) return; _t.stop(); } | |
915 inline void resume() { if (!UsePerfData) return; _t.start(); } | |
916 | |
917 inline ~PerfTraceTime() { | |
918 if (!UsePerfData || (_recursion_counter != NULL && | |
919 --(*_recursion_counter) > 0)) return; | |
920 _t.stop(); | |
921 _timerp->inc(_t.ticks()); | |
922 } | |
923 }; | |
924 | |
925 /* The PerfTraceTimedEvent class is responsible for counting the | |
926 * occurrence of some event and measuring the the elapsed time of | |
927 * the event in two separate PerfCounter instances. | |
928 * | |
929 * Example: | |
930 * | |
931 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, CHECK); | |
932 * static PerfCounter* my_event_counter = PerfDataManager::create_counter("my.event.counter", PerfData::U_Events, CHECK); | |
933 * | |
934 * { | |
935 * PerfTraceTimedEvent ptte(my_time_counter, my_event_counter); | |
936 * // perform the operation you want to count and measure | |
937 * } | |
938 * | |
939 * Note: use of this class does not need to occur within a guarded | |
940 * block. The UsePerfData guard is used with the implementation | |
941 * of this class. | |
942 * | |
943 */ | |
944 class PerfTraceTimedEvent : public PerfTraceTime { | |
945 | |
946 protected: | |
947 PerfLongCounter* _eventp; | |
948 | |
949 public: | |
950 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp): PerfTraceTime(timerp), _eventp(eventp) { | |
951 if (!UsePerfData) return; | |
952 _eventp->inc(); | |
953 } | |
954 | |
955 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp, int* recursion_counter): PerfTraceTime(timerp, recursion_counter), _eventp(eventp) { | |
956 if (!UsePerfData) return; | |
957 _eventp->inc(); | |
958 } | |
959 }; |