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annotate src/share/vm/runtime/perfData.hpp @ 2442:c2323e2ea62b
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Reviewed-by: kvn, jrose, phh
author | never |
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date | Thu, 31 Mar 2011 21:05:55 -0700 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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 * | |
1552
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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 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_PERFDATA_HPP |
26 #define SHARE_VM_RUNTIME_PERFDATA_HPP | |
27 | |
28 #include "memory/allocation.inline.hpp" | |
29 #include "runtime/perfMemory.hpp" | |
30 #include "runtime/timer.hpp" | |
31 #include "utilities/growableArray.hpp" | |
32 | |
0 | 33 /* jvmstat global and subsystem counter name space - enumeration value |
34 * serve as an index into the PerfDataManager::_name_space[] array | |
35 * containing the corresponding name space string. Only the top level | |
36 * subsystem name spaces are represented here. | |
37 */ | |
38 enum CounterNS { | |
39 // top level name spaces | |
40 JAVA_NS, | |
41 COM_NS, | |
42 SUN_NS, | |
43 // subsystem name spaces | |
44 JAVA_GC, // Garbage Collection name spaces | |
45 COM_GC, | |
46 SUN_GC, | |
47 JAVA_CI, // Compiler name spaces | |
48 COM_CI, | |
49 SUN_CI, | |
50 JAVA_CLS, // Class Loader name spaces | |
51 COM_CLS, | |
52 SUN_CLS, | |
53 JAVA_RT, // Runtime name spaces | |
54 COM_RT, | |
55 SUN_RT, | |
56 JAVA_OS, // Operating System name spaces | |
57 COM_OS, | |
58 SUN_OS, | |
59 JAVA_THREADS, // Threads System name spaces | |
60 COM_THREADS, | |
61 SUN_THREADS, | |
62 JAVA_PROPERTY, // Java Property name spaces | |
63 COM_PROPERTY, | |
64 SUN_PROPERTY, | |
65 NULL_NS, | |
66 COUNTERNS_LAST = NULL_NS | |
67 }; | |
68 | |
69 /* | |
70 * Classes to support access to production performance data | |
71 * | |
72 * The PerfData class structure is provided for creation, access, and update | |
73 * of performance data (a.k.a. instrumentation) in a specific memory region | |
74 * which is possibly accessible as shared memory. Although not explicitly | |
75 * prevented from doing so, developers should not use the values returned | |
76 * by accessor methods to make algorithmic decisions as they are potentially | |
77 * extracted from a shared memory region. Although any shared memory region | |
78 * created is with appropriate access restrictions, allowing read-write access | |
79 * only to the principal that created the JVM, it is believed that a the | |
80 * shared memory region facilitates an easier attack path than attacks | |
81 * launched through mechanisms such as /proc. For this reason, it is | |
82 * recommended that data returned by PerfData accessor methods be used | |
83 * cautiously. | |
84 * | |
85 * There are three variability classifications of performance data | |
86 * Constants - value is written to the PerfData memory once, on creation | |
87 * Variables - value is modifiable, with no particular restrictions | |
88 * Counters - value is monotonically changing (increasing or decreasing) | |
89 * | |
90 * The performance data items can also have various types. The class | |
91 * hierarchy and the structure of the memory region are designed to | |
92 * accommodate new types as they are needed. Types are specified in | |
93 * terms of Java basic types, which accommodates client applications | |
94 * written in the Java programming language. The class hierarchy is: | |
95 * | |
96 * - PerfData (Abstract) | |
97 * - PerfLong (Abstract) | |
98 * - PerfLongConstant (alias: PerfConstant) | |
99 * - PerfLongVariant (Abstract) | |
100 * - PerfLongVariable (alias: PerfVariable) | |
101 * - PerfLongCounter (alias: PerfCounter) | |
102 * | |
103 * - PerfByteArray (Abstract) | |
104 * - PerfString (Abstract) | |
105 * - PerfStringVariable | |
106 * - PerfStringConstant | |
107 * | |
108 * | |
109 * As seen in the class hierarchy, the initially supported types are: | |
110 * | |
111 * Long - performance data holds a Java long type | |
112 * ByteArray - performance data holds an array of Java bytes | |
113 * used for holding C++ char arrays. | |
114 * | |
115 * The String type is derived from the ByteArray type. | |
116 * | |
117 * A PerfData subtype is not required to provide an implementation for | |
118 * each variability classification. For example, the String type provides | |
119 * Variable and Constant variablility classifications in the PerfStringVariable | |
120 * and PerfStringConstant classes, but does not provide a counter type. | |
121 * | |
122 * Performance data are also described by a unit of measure. Units allow | |
123 * client applications to make reasonable decisions on how to treat | |
124 * performance data generically, preventing the need to hard-code the | |
125 * specifics of a particular data item in client applications. The current | |
126 * set of units are: | |
127 * | |
128 * None - the data has no units of measure | |
129 * Bytes - data is measured in bytes | |
130 * Ticks - data is measured in clock ticks | |
131 * Events - data is measured in events. For example, | |
132 * the number of garbage collection events or the | |
133 * number of methods compiled. | |
134 * String - data is not numerical. For example, | |
135 * the java command line options | |
136 * Hertz - data is a frequency | |
137 * | |
138 * The performance counters also provide a support attribute, indicating | |
139 * the stability of the counter as a programmatic interface. The support | |
140 * level is also implied by the name space in which the counter is created. | |
141 * The counter name space support conventions follow the Java package, class, | |
142 * and property support conventions: | |
143 * | |
144 * java.* - stable, supported interface | |
145 * com.sun.* - unstable, supported interface | |
146 * sun.* - unstable, unsupported interface | |
147 * | |
148 * In the above context, unstable is a measure of the interface support | |
149 * level, not the implementation stability level. | |
150 * | |
151 * Currently, instances of PerfData subtypes are considered to have | |
152 * a life time equal to that of the VM and are managed by the | |
153 * PerfDataManager class. All constructors for the PerfData class and | |
154 * its subtypes have protected constructors. Creation of PerfData | |
155 * instances is performed by invoking various create methods on the | |
156 * PerfDataManager class. Users should not attempt to delete these | |
157 * instances as the PerfDataManager class expects to perform deletion | |
158 * operations on exit of the VM. | |
159 * | |
160 * Examples: | |
161 * | |
162 * Creating performance counter that holds a monotonically increasing | |
163 * long data value with units specified in U_Bytes in the "java.gc.*" | |
164 * name space. | |
165 * | |
166 * PerfLongCounter* foo_counter; | |
167 * | |
168 * foo_counter = PerfDataManager::create_long_counter(JAVA_GC, "foo", | |
169 * PerfData::U_Bytes, | |
170 * optionalInitialValue, | |
171 * CHECK); | |
172 * foo_counter->inc(); | |
173 * | |
174 * Creating a performance counter that holds a variably change long | |
175 * data value with untis specified in U_Bytes in the "com.sun.ci | |
176 * name space. | |
177 * | |
178 * PerfLongVariable* bar_varible; | |
179 * bar_variable = PerfDataManager::create_long_variable(COM_CI, "bar", | |
180 .* PerfData::U_Bytes, | |
181 * optionalInitialValue, | |
182 * CHECK); | |
183 * | |
184 * bar_variable->inc(); | |
185 * bar_variable->set_value(0); | |
186 * | |
187 * Creating a performance counter that holds a constant string value in | |
188 * the "sun.cls.*" name space. | |
189 * | |
190 * PerfDataManager::create_string_constant(SUN_CLS, "foo", string, CHECK); | |
191 * | |
192 * Although the create_string_constant() factory method returns a pointer | |
193 * to the PerfStringConstant object, it can safely be ignored. Developers | |
194 * are not encouraged to access the string constant's value via this | |
195 * pointer at this time due to security concerns. | |
196 * | |
197 * Creating a performance counter in an arbitrary name space that holds a | |
198 * value that is sampled by the StatSampler periodic task. | |
199 * | |
200 * PerfDataManager::create_counter("foo.sampled", PerfData::U_Events, | |
201 * &my_jlong, CHECK); | |
202 * | |
203 * In this example, the PerfData pointer can be ignored as the caller | |
204 * is relying on the StatSampler PeriodicTask to sample the given | |
205 * address at a regular interval. The interval is defined by the | |
206 * PerfDataSamplingInterval global variable, and is applyied on | |
207 * a system wide basis, not on an per-counter basis. | |
208 * | |
209 * Creating a performance counter in an arbitrary name space that utilizes | |
210 * a helper object to return a value to the StatSampler via the take_sample() | |
211 * method. | |
212 * | |
213 * class MyTimeSampler : public PerfLongSampleHelper { | |
214 * public: | |
215 * jlong take_sample() { return os::elapsed_counter(); } | |
216 * }; | |
217 * | |
218 * PerfDataManager::create_counter(SUN_RT, "helped", | |
219 * PerfData::U_Ticks, | |
220 * new MyTimeSampler(), CHECK); | |
221 * | |
222 * In this example, a subtype of PerfLongSampleHelper is instantiated | |
223 * and its take_sample() method is overridden to perform whatever | |
224 * operation is necessary to generate the data sample. This method | |
225 * will be called by the StatSampler at a regular interval, defined | |
226 * by the PerfDataSamplingInterval global variable. | |
227 * | |
228 * As before, PerfSampleHelper is an alias for PerfLongSampleHelper. | |
229 * | |
230 * For additional uses of PerfData subtypes, see the utility classes | |
231 * PerfTraceTime and PerfTraceTimedEvent below. | |
232 * | |
233 * Always-on non-sampled counters can be created independent of | |
234 * the UsePerfData flag. Counters will be created on the c-heap | |
235 * if UsePerfData is false. | |
236 * | |
237 * Until further noice, all PerfData objects should be created and | |
238 * manipulated within a guarded block. The guard variable is | |
239 * UsePerfData, a product flag set to true by default. This flag may | |
240 * be removed from the product in the future. | |
241 * | |
242 */ | |
243 class PerfData : public CHeapObj { | |
244 | |
245 friend class StatSampler; // for access to protected void sample() | |
246 friend class PerfDataManager; // for access to protected destructor | |
247 | |
248 public: | |
249 | |
250 // the Variability enum must be kept in synchronization with the | |
251 // the com.sun.hotspot.perfdata.Variability class | |
252 enum Variability { | |
253 V_Constant = 1, | |
254 V_Monotonic = 2, | |
255 V_Variable = 3, | |
256 V_last = V_Variable | |
257 }; | |
258 | |
259 // the Units enum must be kept in synchronization with the | |
260 // the com.sun.hotspot.perfdata.Units class | |
261 enum Units { | |
262 U_None = 1, | |
263 U_Bytes = 2, | |
264 U_Ticks = 3, | |
265 U_Events = 4, | |
266 U_String = 5, | |
267 U_Hertz = 6, | |
268 U_Last = U_Hertz | |
269 }; | |
270 | |
271 // Miscellaneous flags | |
272 enum Flags { | |
273 F_None = 0x0, | |
274 F_Supported = 0x1 // interface is supported - java.* and com.sun.* | |
275 }; | |
276 | |
277 private: | |
278 char* _name; | |
279 Variability _v; | |
280 Units _u; | |
281 bool _on_c_heap; | |
282 Flags _flags; | |
283 | |
284 PerfDataEntry* _pdep; | |
285 | |
286 protected: | |
287 | |
288 void *_valuep; | |
289 | |
290 PerfData(CounterNS ns, const char* name, Units u, Variability v); | |
291 ~PerfData(); | |
292 | |
293 // create the entry for the PerfData item in the PerfData memory region. | |
294 // this region is maintained separately from the PerfData objects to | |
295 // facilitate its use by external processes. | |
296 void create_entry(BasicType dtype, size_t dsize, size_t dlen = 0); | |
297 | |
298 // sample the data item given at creation time and write its value | |
299 // into the its corresponding PerfMemory location. | |
300 virtual void sample() = 0; | |
301 | |
302 public: | |
303 | |
304 // returns a boolean indicating the validity of this object. | |
305 // the object is valid if and only if memory in PerfMemory | |
306 // region was successfully allocated. | |
307 inline bool is_valid() { return _valuep != NULL; } | |
308 | |
309 // returns a boolean indicating whether the underlying object | |
310 // was allocated in the PerfMemory region or on the C heap. | |
311 inline bool is_on_c_heap() { return _on_c_heap; } | |
312 | |
313 // returns a pointer to a char* containing the name of the item. | |
314 // The pointer returned is the pointer to a copy of the name | |
315 // passed to the constructor, not the pointer to the name in the | |
316 // PerfData memory region. This redundancy is maintained for | |
317 // security reasons as the PerfMemory region may be in shared | |
318 // memory. | |
319 const char* name() { return _name; } | |
320 | |
321 // returns the variability classification associated with this item | |
322 Variability variability() { return _v; } | |
323 | |
324 // returns the units associated with this item. | |
325 Units units() { return _u; } | |
326 | |
327 // returns the flags associated with this item. | |
328 Flags flags() { return _flags; } | |
329 | |
330 // returns the address of the data portion of the item in the | |
331 // PerfData memory region. | |
332 inline void* get_address() { return _valuep; } | |
333 | |
334 // returns the value of the data portion of the item in the | |
335 // PerfData memory region formatted as a string. | |
336 virtual int format(char* cp, int length) = 0; | |
337 }; | |
338 | |
339 /* | |
340 * PerfLongSampleHelper, and its alias PerfSamplerHelper, is a base class | |
341 * for helper classes that rely upon the StatSampler periodic task to | |
342 * invoke the take_sample() method and write the value returned to its | |
343 * appropriate location in the PerfData memory region. | |
344 */ | |
345 class PerfLongSampleHelper : public CHeapObj { | |
346 public: | |
347 virtual jlong take_sample() = 0; | |
348 }; | |
349 | |
350 typedef PerfLongSampleHelper PerfSampleHelper; | |
351 | |
352 | |
353 /* | |
354 * PerfLong is the base class for the various Long PerfData subtypes. | |
355 * it contains implementation details that are common among its derived | |
356 * types. | |
357 */ | |
358 class PerfLong : public PerfData { | |
359 | |
360 protected: | |
361 | |
362 PerfLong(CounterNS ns, const char* namep, Units u, Variability v); | |
363 | |
364 public: | |
365 int format(char* buffer, int length); | |
366 | |
367 // returns the value of the data portion of the item in the | |
368 // PerfData memory region. | |
369 inline jlong get_value() { return *(jlong*)_valuep; } | |
370 }; | |
371 | |
372 /* | |
373 * The PerfLongConstant class, and its alias PerfConstant, implement | |
374 * a PerfData subtype that holds a jlong data value that is set upon | |
375 * creation of an instance of this class. This class provides no | |
376 * methods for changing the data value stored in PerfData memory region. | |
377 */ | |
378 class PerfLongConstant : public PerfLong { | |
379 | |
380 friend class PerfDataManager; // for access to protected constructor | |
381 | |
382 private: | |
383 // hide sample() - no need to sample constants | |
384 void sample() { } | |
385 | |
386 protected: | |
387 | |
388 PerfLongConstant(CounterNS ns, const char* namep, Units u, | |
389 jlong initial_value=0) | |
390 : PerfLong(ns, namep, u, V_Constant) { | |
391 | |
392 if (is_valid()) *(jlong*)_valuep = initial_value; | |
393 } | |
394 }; | |
395 | |
396 typedef PerfLongConstant PerfConstant; | |
397 | |
398 /* | |
399 * The PerfLongVariant class, and its alias PerfVariant, implement | |
400 * a PerfData subtype that holds a jlong data value that can be modified | |
401 * in an unrestricted manner. This class provides the implementation details | |
402 * for common functionality among its derived types. | |
403 */ | |
404 class PerfLongVariant : public PerfLong { | |
405 | |
406 protected: | |
407 jlong* _sampled; | |
408 PerfLongSampleHelper* _sample_helper; | |
409 | |
410 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
411 jlong initial_value=0) | |
412 : PerfLong(ns, namep, u, v) { | |
413 if (is_valid()) *(jlong*)_valuep = initial_value; | |
414 } | |
415 | |
416 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
417 jlong* sampled); | |
418 | |
419 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
420 PerfLongSampleHelper* sample_helper); | |
421 | |
422 void sample(); | |
423 | |
424 public: | |
425 inline void inc() { (*(jlong*)_valuep)++; } | |
426 inline void inc(jlong val) { (*(jlong*)_valuep) += val; } | |
427 inline void add(jlong val) { (*(jlong*)_valuep) += val; } | |
428 }; | |
429 | |
430 /* | |
431 * The PerfLongCounter class, and its alias PerfCounter, implement | |
432 * a PerfData subtype that holds a jlong data value that can (should) | |
433 * be modified in a monotonic manner. The inc(jlong) and add(jlong) | |
434 * methods can be passed negative values to implement a monotonically | |
435 * decreasing value. However, we rely upon the programmer to honor | |
436 * the notion that this counter always moves in the same direction - | |
437 * either increasing or decreasing. | |
438 */ | |
439 class PerfLongCounter : public PerfLongVariant { | |
440 | |
441 friend class PerfDataManager; // for access to protected constructor | |
442 | |
443 protected: | |
444 | |
445 PerfLongCounter(CounterNS ns, const char* namep, Units u, | |
446 jlong initial_value=0) | |
447 : PerfLongVariant(ns, namep, u, V_Monotonic, | |
448 initial_value) { } | |
449 | |
450 PerfLongCounter(CounterNS ns, const char* namep, Units u, jlong* sampled) | |
451 : PerfLongVariant(ns, namep, u, V_Monotonic, sampled) { } | |
452 | |
453 PerfLongCounter(CounterNS ns, const char* namep, Units u, | |
454 PerfLongSampleHelper* sample_helper) | |
455 : PerfLongVariant(ns, namep, u, V_Monotonic, | |
456 sample_helper) { } | |
457 }; | |
458 | |
459 typedef PerfLongCounter PerfCounter; | |
460 | |
461 /* | |
462 * The PerfLongVariable class, and its alias PerfVariable, implement | |
463 * a PerfData subtype that holds a jlong data value that can | |
464 * be modified in an unrestricted manner. | |
465 */ | |
466 class PerfLongVariable : public PerfLongVariant { | |
467 | |
468 friend class PerfDataManager; // for access to protected constructor | |
469 | |
470 protected: | |
471 | |
472 PerfLongVariable(CounterNS ns, const char* namep, Units u, | |
473 jlong initial_value=0) | |
474 : PerfLongVariant(ns, namep, u, V_Variable, | |
475 initial_value) { } | |
476 | |
477 PerfLongVariable(CounterNS ns, const char* namep, Units u, jlong* sampled) | |
478 : PerfLongVariant(ns, namep, u, V_Variable, sampled) { } | |
479 | |
480 PerfLongVariable(CounterNS ns, const char* namep, Units u, | |
481 PerfLongSampleHelper* sample_helper) | |
482 : PerfLongVariant(ns, namep, u, V_Variable, | |
483 sample_helper) { } | |
484 | |
485 public: | |
486 inline void set_value(jlong val) { (*(jlong*)_valuep) = val; } | |
487 }; | |
488 | |
489 typedef PerfLongVariable PerfVariable; | |
490 | |
491 /* | |
492 * The PerfByteArray provides a PerfData subtype that allows the creation | |
493 * of a contiguous region of the PerfData memory region for storing a vector | |
494 * of bytes. This class is currently intended to be a base class for | |
495 * the PerfString class, and cannot be instantiated directly. | |
496 */ | |
497 class PerfByteArray : public PerfData { | |
498 | |
499 protected: | |
500 jint _length; | |
501 | |
502 PerfByteArray(CounterNS ns, const char* namep, Units u, Variability v, | |
503 jint length); | |
504 }; | |
505 | |
506 class PerfString : public PerfByteArray { | |
507 | |
508 protected: | |
509 | |
510 void set_string(const char* s2); | |
511 | |
512 PerfString(CounterNS ns, const char* namep, Variability v, jint length, | |
513 const char* initial_value) | |
514 : PerfByteArray(ns, namep, U_String, v, length) { | |
515 if (is_valid()) set_string(initial_value); | |
516 } | |
517 | |
518 public: | |
519 | |
520 int format(char* buffer, int length); | |
521 }; | |
522 | |
523 /* | |
524 * The PerfStringConstant class provides a PerfData sub class that | |
525 * allows a null terminated string of single byte characters to be | |
526 * stored in the PerfData memory region. | |
527 */ | |
528 class PerfStringConstant : public PerfString { | |
529 | |
530 friend class PerfDataManager; // for access to protected constructor | |
531 | |
532 private: | |
533 | |
534 // hide sample() - no need to sample constants | |
535 void sample() { } | |
536 | |
537 protected: | |
538 | |
539 // Restrict string constant lengths to be <= PerfMaxStringConstLength. | |
540 // This prevents long string constants, as can occur with very | |
541 // long classpaths or java command lines, from consuming too much | |
542 // PerfData memory. | |
543 PerfStringConstant(CounterNS ns, const char* namep, | |
544 const char* initial_value); | |
545 }; | |
546 | |
547 /* | |
548 * The PerfStringVariable class provides a PerfData sub class that | |
549 * allows a null terminated string of single byte character data | |
550 * to be stored in PerfData memory region. The string value can be reset | |
551 * after initialization. If the string value is >= max_length, then | |
552 * it will be truncated to max_length characters. The copied string | |
553 * is always null terminated. | |
554 */ | |
555 class PerfStringVariable : public PerfString { | |
556 | |
557 friend class PerfDataManager; // for access to protected constructor | |
558 | |
559 protected: | |
560 | |
561 // sampling of string variables are not yet supported | |
562 void sample() { } | |
563 | |
564 PerfStringVariable(CounterNS ns, const char* namep, jint max_length, | |
565 const char* initial_value) | |
566 : PerfString(ns, namep, V_Variable, max_length+1, | |
567 initial_value) { } | |
568 | |
569 public: | |
570 inline void set_value(const char* val) { set_string(val); } | |
571 }; | |
572 | |
573 | |
574 /* | |
575 * The PerfDataList class is a container class for managing lists | |
576 * of PerfData items. The intention of this class is to allow for | |
577 * alternative implementations for management of list of PerfData | |
578 * items without impacting the code that uses the lists. | |
579 * | |
580 * The initial implementation is based upon GrowableArray. Searches | |
581 * on GrowableArray types is linear in nature and this may become | |
582 * a performance issue for creation of PerfData items, particularly | |
583 * from Java code where a test for existence is implemented as a | |
584 * search over all existing PerfData items. | |
585 * | |
586 * The abstraction is not complete. A more general container class | |
587 * would provide an Iterator abstraction that could be used to | |
588 * traverse the lists. This implementation still relys upon integer | |
589 * iterators and the at(int index) method. However, the GrowableArray | |
590 * is not directly visible outside this class and can be replaced by | |
591 * some other implementation, as long as that implementation provides | |
592 * a mechanism to iterate over the container by index. | |
593 */ | |
594 class PerfDataList : public CHeapObj { | |
595 | |
596 private: | |
597 | |
598 // GrowableArray implementation | |
599 typedef GrowableArray<PerfData*> PerfDataArray; | |
600 | |
601 PerfDataArray* _set; | |
602 | |
603 // method to search for a instrumentation object by name | |
604 static bool by_name(void* name, PerfData* pd); | |
605 | |
606 protected: | |
607 // we expose the implementation here to facilitate the clone | |
608 // method. | |
609 PerfDataArray* get_impl() { return _set; } | |
610 | |
611 public: | |
612 | |
613 // create a PerfDataList with the given initial length | |
614 PerfDataList(int length); | |
615 | |
616 // create a PerfDataList as a shallow copy of the given PerfDataList | |
617 PerfDataList(PerfDataList* p); | |
618 | |
619 ~PerfDataList(); | |
620 | |
621 // return the PerfData item indicated by name, | |
622 // or NULL if it doesn't exist. | |
623 PerfData* find_by_name(const char* name); | |
624 | |
625 // return true if a PerfData item with the name specified in the | |
626 // argument exists, otherwise return false. | |
627 bool contains(const char* name) { return find_by_name(name) != NULL; } | |
628 | |
629 // return the number of PerfData items in this list | |
630 int length() { return _set->length(); } | |
631 | |
632 // add a PerfData item to this list | |
633 void append(PerfData *p) { _set->append(p); } | |
634 | |
635 // remove the given PerfData item from this list. When called | |
636 // while iterating over the list, this method will result in a | |
637 // change in the length of the container. The at(int index) | |
638 // method is also impacted by this method as elements with an | |
639 // index greater than the index of the element removed by this | |
640 // method will be shifted down by one. | |
641 void remove(PerfData *p) { _set->remove(p); } | |
642 | |
643 // create a new PerfDataList from this list. The new list is | |
644 // a shallow copy of the original list and care should be taken | |
645 // with respect to delete operations on the elements of the list | |
646 // as the are likely in use by another copy of the list. | |
647 PerfDataList* clone(); | |
648 | |
649 // for backward compatibility with GrowableArray - need to implement | |
650 // some form of iterator to provide a cleaner abstraction for | |
651 // iteration over the container. | |
652 PerfData* at(int index) { return _set->at(index); } | |
653 }; | |
654 | |
655 | |
656 /* | |
657 * The PerfDataManager class is responsible for creating PerfData | |
658 * subtypes via a set a factory methods and for managing lists | |
659 * of the various PerfData types. | |
660 */ | |
661 class PerfDataManager : AllStatic { | |
662 | |
663 friend class StatSampler; // for access to protected PerfDataList methods | |
664 | |
665 private: | |
666 static PerfDataList* _all; | |
667 static PerfDataList* _sampled; | |
668 static PerfDataList* _constants; | |
669 static const char* _name_spaces[]; | |
670 | |
671 // add a PerfData item to the list(s) of know PerfData objects | |
672 static void add_item(PerfData* p, bool sampled); | |
673 | |
674 protected: | |
675 // return the list of all known PerfData items | |
676 static PerfDataList* all(); | |
677 static int count() { return _all->length(); } | |
678 | |
679 // return the list of all known PerfData items that are to be | |
680 // sampled by the StatSampler. | |
681 static PerfDataList* sampled(); | |
682 static int sampled_count() { return _sampled->length(); } | |
683 | |
684 // return the list of all known PerfData items that have a | |
685 // variability classification of type Constant | |
686 static PerfDataList* constants(); | |
687 static int constants_count() { return _constants->length(); } | |
688 | |
689 public: | |
690 | |
691 // method to check for the existence of a PerfData item with | |
692 // the given name. | |
693 static bool exists(const char* name) { return _all->contains(name); } | |
694 | |
695 // method to map a CounterNS enumeration to a namespace string | |
696 static const char* ns_to_string(CounterNS ns) { | |
697 return _name_spaces[ns]; | |
698 } | |
699 | |
700 // methods to test the interface stability of a given counter namespace | |
701 // | |
702 static bool is_stable_supported(CounterNS ns) { | |
703 return (ns != NULL_NS) && ((ns % 3) == JAVA_NS); | |
704 } | |
705 static bool is_unstable_supported(CounterNS ns) { | |
706 return (ns != NULL_NS) && ((ns % 3) == COM_NS); | |
707 } | |
708 static bool is_unstable_unsupported(CounterNS ns) { | |
709 return (ns == NULL_NS) || ((ns % 3) == SUN_NS); | |
710 } | |
711 | |
712 // methods to test the interface stability of a given counter name | |
713 // | |
714 static bool is_stable_supported(const char* name) { | |
715 const char* javadot = "java."; | |
716 return strncmp(name, javadot, strlen(javadot)) == 0; | |
717 } | |
718 static bool is_unstable_supported(const char* name) { | |
719 const char* comdot = "com.sun."; | |
720 return strncmp(name, comdot, strlen(comdot)) == 0; | |
721 } | |
722 static bool is_unstable_unsupported(const char* name) { | |
723 return !(is_stable_supported(name) && is_unstable_supported(name)); | |
724 } | |
725 | |
726 // method to construct counter name strings in a given name space. | |
727 // The string object is allocated from the Resource Area and calls | |
728 // to this method must be made within a ResourceMark. | |
729 // | |
730 static char* counter_name(const char* name_space, const char* name); | |
731 | |
732 // method to construct name space strings in a given name space. | |
733 // The string object is allocated from the Resource Area and calls | |
734 // to this method must be made within a ResourceMark. | |
735 // | |
736 static char* name_space(const char* name_space, const char* sub_space) { | |
737 return counter_name(name_space, sub_space); | |
738 } | |
739 | |
740 // same as above, but appends the instance number to the name space | |
741 // | |
742 static char* name_space(const char* name_space, const char* sub_space, | |
743 int instance); | |
744 static char* name_space(const char* name_space, int instance); | |
745 | |
746 | |
747 // these methods provide the general interface for creating | |
748 // performance data resources. The types of performance data | |
749 // resources can be extended by adding additional create<type> | |
750 // methods. | |
751 | |
752 // Constant Types | |
753 static PerfStringConstant* create_string_constant(CounterNS ns, | |
754 const char* name, | |
755 const char *s, TRAPS); | |
756 | |
757 static PerfLongConstant* create_long_constant(CounterNS ns, | |
758 const char* name, | |
759 PerfData::Units u, | |
760 jlong val, TRAPS); | |
761 | |
762 | |
763 // Variable Types | |
764 static PerfStringVariable* create_string_variable(CounterNS ns, | |
765 const char* name, | |
766 int max_length, | |
767 const char *s, TRAPS); | |
768 | |
769 static PerfStringVariable* create_string_variable(CounterNS ns, | |
770 const char* name, | |
771 const char *s, TRAPS) { | |
772 return create_string_variable(ns, name, 0, s, CHECK_NULL); | |
773 }; | |
774 | |
775 static PerfLongVariable* create_long_variable(CounterNS ns, | |
776 const char* name, | |
777 PerfData::Units u, | |
778 jlong ival, TRAPS); | |
779 | |
780 static PerfLongVariable* create_long_variable(CounterNS ns, | |
781 const char* name, | |
782 PerfData::Units u, TRAPS) { | |
783 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); | |
784 }; | |
785 | |
786 static PerfLongVariable* create_long_variable(CounterNS, const char* name, | |
787 PerfData::Units u, | |
788 jlong* sp, TRAPS); | |
789 | |
790 static PerfLongVariable* create_long_variable(CounterNS ns, | |
791 const char* name, | |
792 PerfData::Units u, | |
793 PerfLongSampleHelper* sh, | |
794 TRAPS); | |
795 | |
796 | |
797 // Counter Types | |
798 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
799 PerfData::Units u, | |
800 jlong ival, TRAPS); | |
801 | |
802 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
803 PerfData::Units u, TRAPS) { | |
804 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); | |
805 }; | |
806 | |
807 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
808 PerfData::Units u, jlong* sp, | |
809 TRAPS); | |
810 | |
811 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
812 PerfData::Units u, | |
813 PerfLongSampleHelper* sh, | |
814 TRAPS); | |
815 | |
816 | |
817 // these creation methods are provided for ease of use. These allow | |
818 // Long performance data types to be created with a shorthand syntax. | |
819 | |
820 static PerfConstant* create_constant(CounterNS ns, const char* name, | |
821 PerfData::Units u, jlong val, TRAPS) { | |
822 return create_long_constant(ns, name, u, val, CHECK_NULL); | |
823 } | |
824 | |
825 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
826 PerfData::Units u, jlong ival, TRAPS) { | |
827 return create_long_variable(ns, name, u, ival, CHECK_NULL); | |
828 } | |
829 | |
830 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
831 PerfData::Units u, TRAPS) { | |
832 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); | |
833 } | |
834 | |
835 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
836 PerfData::Units u, jlong* sp, TRAPS) { | |
837 return create_long_variable(ns, name, u, sp, CHECK_NULL); | |
838 } | |
839 | |
840 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
841 PerfData::Units u, | |
842 PerfSampleHelper* sh, TRAPS) { | |
843 return create_long_variable(ns, name, u, sh, CHECK_NULL); | |
844 } | |
845 | |
846 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
847 PerfData::Units u, jlong ival, TRAPS) { | |
848 return create_long_counter(ns, name, u, ival, CHECK_NULL); | |
849 } | |
850 | |
851 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
852 PerfData::Units u, TRAPS) { | |
853 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); | |
854 } | |
855 | |
856 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
857 PerfData::Units u, jlong* sp, TRAPS) { | |
858 return create_long_counter(ns, name, u, sp, CHECK_NULL); | |
859 } | |
860 | |
861 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
862 PerfData::Units u, | |
863 PerfSampleHelper* sh, TRAPS) { | |
864 return create_long_counter(ns, name, u, sh, CHECK_NULL); | |
865 } | |
866 | |
867 static void destroy(); | |
868 }; | |
869 | |
870 // Useful macros to create the performance counters | |
871 #define NEWPERFTICKCOUNTER(counter, counter_ns, counter_name) \ | |
872 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ | |
873 PerfData::U_Ticks,CHECK);} | |
874 | |
875 #define NEWPERFEVENTCOUNTER(counter, counter_ns, counter_name) \ | |
876 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ | |
877 PerfData::U_Events,CHECK);} | |
878 | |
875
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879 #define NEWPERFBYTECOUNTER(counter, counter_ns, counter_name) \ |
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880 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ |
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881 PerfData::U_Bytes,CHECK);} |
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882 |
0 | 883 // Utility Classes |
884 | |
885 /* | |
886 * this class will administer a PerfCounter used as a time accumulator | |
887 * for a basic block much like the TraceTime class. | |
888 * | |
889 * Example: | |
890 * | |
891 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, 0LL, CHECK); | |
892 * | |
893 * { | |
894 * PerfTraceTime ptt(my_time_counter); | |
895 * // perform the operation you want to measure | |
896 * } | |
897 * | |
898 * Note: use of this class does not need to occur within a guarded | |
899 * block. The UsePerfData guard is used with the implementation | |
900 * of this class. | |
901 */ | |
902 class PerfTraceTime : public StackObj { | |
903 | |
904 protected: | |
905 elapsedTimer _t; | |
906 PerfLongCounter* _timerp; | |
907 // pointer to thread-local or global recursion counter variable | |
908 int* _recursion_counter; | |
909 | |
910 public: | |
911 inline PerfTraceTime(PerfLongCounter* timerp) : _timerp(timerp), _recursion_counter(NULL) { | |
912 if (!UsePerfData) return; | |
913 _t.start(); | |
914 } | |
915 | |
916 inline PerfTraceTime(PerfLongCounter* timerp, int* recursion_counter) : _timerp(timerp), _recursion_counter(recursion_counter) { | |
917 if (!UsePerfData || (_recursion_counter != NULL && | |
918 (*_recursion_counter)++ > 0)) return; | |
919 _t.start(); | |
920 } | |
921 | |
922 inline void suspend() { if (!UsePerfData) return; _t.stop(); } | |
923 inline void resume() { if (!UsePerfData) return; _t.start(); } | |
924 | |
925 inline ~PerfTraceTime() { | |
926 if (!UsePerfData || (_recursion_counter != NULL && | |
927 --(*_recursion_counter) > 0)) return; | |
928 _t.stop(); | |
929 _timerp->inc(_t.ticks()); | |
930 } | |
931 }; | |
932 | |
933 /* The PerfTraceTimedEvent class is responsible for counting the | |
934 * occurrence of some event and measuring the the elapsed time of | |
935 * the event in two separate PerfCounter instances. | |
936 * | |
937 * Example: | |
938 * | |
939 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, CHECK); | |
940 * static PerfCounter* my_event_counter = PerfDataManager::create_counter("my.event.counter", PerfData::U_Events, CHECK); | |
941 * | |
942 * { | |
943 * PerfTraceTimedEvent ptte(my_time_counter, my_event_counter); | |
944 * // perform the operation you want to count and measure | |
945 * } | |
946 * | |
947 * Note: use of this class does not need to occur within a guarded | |
948 * block. The UsePerfData guard is used with the implementation | |
949 * of this class. | |
950 * | |
951 */ | |
952 class PerfTraceTimedEvent : public PerfTraceTime { | |
953 | |
954 protected: | |
955 PerfLongCounter* _eventp; | |
956 | |
957 public: | |
958 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp): PerfTraceTime(timerp), _eventp(eventp) { | |
959 if (!UsePerfData) return; | |
960 _eventp->inc(); | |
961 } | |
962 | |
963 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp, int* recursion_counter): PerfTraceTime(timerp, recursion_counter), _eventp(eventp) { | |
964 if (!UsePerfData) return; | |
965 _eventp->inc(); | |
966 } | |
967 }; | |
1972 | 968 |
969 #endif // SHARE_VM_RUNTIME_PERFDATA_HPP |