1 /*
2 * Copyright (c) 2001, 2013, 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 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "oops/oop.inline.hpp"
28 #include "runtime/handles.inline.hpp"
29 #include "runtime/java.hpp"
30 #include "runtime/mutex.hpp"
31 #include "runtime/mutexLocker.hpp"
32 #include "runtime/os.hpp"
33 #include "runtime/perfData.hpp"
34 #include "utilities/exceptions.hpp"
35 #include "utilities/globalDefinitions.hpp"
36
37 PerfDataList* PerfDataManager::_all = NULL;
38 PerfDataList* PerfDataManager::_sampled = NULL;
39 PerfDataList* PerfDataManager::_constants = NULL;
40
41 /*
42 * The jvmstat global and subsysem jvmstat counter name spaces. The top
43 * level name spaces imply the interface stability level of the counter,
44 * which generally follows the Java package, class, and property naming
45 * conventions. The CounterNS enumeration values should be used to index
46 * into this array.
47 */
48 const char* PerfDataManager::_name_spaces[] = {
49 // top level name spaces
50 "java", // stable and supported name space
51 "com.sun", // unstable but supported name space
52 "sun", // unstable and unsupported name space
53 // subsystem name spaces
54 "java.gc", // Garbage Collection name spaces
55 "com.sun.gc",
56 "sun.gc",
57 "java.ci", // Compiler name spaces
58 "com.sun.ci",
59 "sun.ci",
60 "java.cls", // Class Loader name spaces
61 "com.sun.cls",
62 "sun.cls",
63 "java.rt", // Runtime name spaces
64 "com.sun.rt",
65 "sun.rt",
66 "java.os", // Operating System name spaces
67 "com.sun.os",
68 "sun.os",
69 "java.threads", // Threads System name spaces
70 "com.sun.threads",
71 "sun.threads",
72 "java.property", // Java Property name spaces
73 "com.sun.property",
74 "sun.property",
75 "",
76 };
77
78 PerfData::PerfData(CounterNS ns, const char* name, Units u, Variability v)
79 : _name(NULL), _u(u), _v(v), _valuep(NULL),
80 _on_c_heap(false) {
81
82 const char* prefix = PerfDataManager::ns_to_string(ns);
83
84 _name = NEW_C_HEAP_ARRAY(char, strlen(name) + strlen(prefix) + 2, mtInternal);
85 assert(_name != NULL && strlen(name) != 0, "invalid name");
86
87 if (ns == NULL_NS) {
88 // No prefix is added to counters with the NULL_NS namespace.
89 strcpy(_name, name);
90 // set the F_Supported flag based on the counter name prefix.
91 if (PerfDataManager::is_stable_supported(_name) ||
92 PerfDataManager::is_unstable_supported(_name)) {
93 _flags = F_Supported;
94 }
95 else {
96 _flags = F_None;
97 }
98 }
99 else {
100 sprintf(_name, "%s.%s", prefix, name);
101 // set the F_Supported flag based on the given namespace.
102 if (PerfDataManager::is_stable_supported(ns) ||
103 PerfDataManager::is_unstable_supported(ns)) {
104 _flags = F_Supported;
105 }
106 else {
107 _flags = F_None;
108 }
109 }
110 }
111
112 PerfData::~PerfData() {
113 if (_name != NULL) {
114 FREE_C_HEAP_ARRAY(char, _name, mtInternal);
115 }
116 if (is_on_c_heap()) {
117 FREE_C_HEAP_ARRAY(PerfDataEntry, _pdep, mtInternal);
118 }
119 }
120
121 void PerfData::create_entry(BasicType dtype, size_t dsize, size_t vlen) {
122
123 size_t dlen = vlen==0 ? 1 : vlen;
124
125 size_t namelen = strlen(name()) + 1; // include null terminator
126 size_t size = sizeof(PerfDataEntry) + namelen;
127 size_t pad_length = ((size % dsize) == 0) ? 0 : dsize - (size % dsize);
128 size += pad_length;
129 size_t data_start = size;
130 size += (dsize * dlen);
131
132 // align size to assure allocation in units of 8 bytes
133 int align = sizeof(jlong) - 1;
134 size = ((size + align) & ~align);
135 char* psmp = PerfMemory::alloc(size);
136
137 if (psmp == NULL) {
138 // out of PerfMemory memory resources. allocate on the C heap
139 // to avoid vm termination.
140 psmp = NEW_C_HEAP_ARRAY(char, size, mtInternal);
141 _on_c_heap = true;
142 }
143
144 // compute the addresses for the name and data
145 char* cname = psmp + sizeof(PerfDataEntry);
146
147 // data is in the last dsize*dlen bytes of the entry
148 void* valuep = (void*) (psmp + data_start);
149
150 assert(is_on_c_heap() || PerfMemory::contains(cname), "just checking");
151 assert(is_on_c_heap() || PerfMemory::contains((char*)valuep), "just checking");
152
153 // copy the name, including null terminator, into PerfData memory
154 strcpy(cname, name());
155
156
157 // set the header values in PerfData memory
158 PerfDataEntry* pdep = (PerfDataEntry*)psmp;
159 pdep->entry_length = (jint)size;
160 pdep->name_offset = (jint) ((uintptr_t) cname - (uintptr_t) psmp);
161 pdep->vector_length = (jint)vlen;
162 pdep->data_type = (jbyte) type2char(dtype);
163 pdep->data_units = units();
164 pdep->data_variability = variability();
165 pdep->flags = (jbyte)flags();
166 pdep->data_offset = (jint) data_start;
167
168 if (PerfTraceDataCreation) {
169 tty->print("name = %s, dtype = %d, variability = %d,"
170 " units = %d, dsize = %d, vlen = %d,"
171 " pad_length = %d, size = %d, on_c_heap = %s,"
172 " address = " INTPTR_FORMAT ","
173 " data address = " INTPTR_FORMAT "\n",
174 cname, dtype, variability(),
175 units(), dsize, vlen,
176 pad_length, size, is_on_c_heap() ? "TRUE":"FALSE",
177 psmp, valuep);
178 }
179
180 // record the start of the entry and the location of the data field.
181 _pdep = pdep;
182 _valuep = valuep;
183
184 // mark the PerfData memory region as having been updated.
185 PerfMemory::mark_updated();
186 }
187
188 PerfLong::PerfLong(CounterNS ns, const char* namep, Units u, Variability v)
189 : PerfData(ns, namep, u, v) {
190
191 create_entry(T_LONG, sizeof(jlong));
192 }
193
194 int PerfLong::format(char* buffer, int length) {
195 return jio_snprintf(buffer, length, JLONG_FORMAT, *(jlong*)_valuep);
196 }
197
198 PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
199 Variability v, jlong* sampled)
200 : PerfLong(ns, namep, u, v),
201 _sampled(sampled), _sample_helper(NULL) {
202
203 sample();
204 }
205
206 PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
207 Variability v, PerfLongSampleHelper* helper)
208 : PerfLong(ns, namep, u, v),
209 _sampled(NULL), _sample_helper(helper) {
210
211 sample();
212 }
213
214 void PerfLongVariant::sample() {
215
216 // JJJ - This should not happen. Maybe the first sample is taken
217 // while the _sample_helper is being null'ed out.
218 // assert(_sample_helper != NULL || _sampled != NULL, "unexpected state");
219 if (_sample_helper == NULL) return;
220
221 if (_sample_helper != NULL) {
222 *(jlong*)_valuep = _sample_helper->take_sample();
223 }
224 else if (_sampled != NULL) {
225 *(jlong*)_valuep = *_sampled;
226 }
227 }
228
229 PerfByteArray::PerfByteArray(CounterNS ns, const char* namep, Units u,
230 Variability v, jint length)
231 : PerfData(ns, namep, u, v), _length(length) {
232
233 create_entry(T_BYTE, sizeof(jbyte), (size_t)_length);
234 }
235
236 void PerfString::set_string(const char* s2) {
237
238 // copy n bytes of the string, assuring the null string is
239 // copied if s2 == NULL.
240 strncpy((char *)_valuep, s2 == NULL ? "" : s2, _length);
241
242 // assure the string is null terminated when strlen(s2) >= _length
243 ((char*)_valuep)[_length-1] = '\0';
244 }
245
246 int PerfString::format(char* buffer, int length) {
247 return jio_snprintf(buffer, length, "%s", (char*)_valuep);
248 }
249
250 PerfStringConstant::PerfStringConstant(CounterNS ns, const char* namep,
251 const char* initial_value)
252 : PerfString(ns, namep, V_Constant,
253 initial_value == NULL ? 1 :
254 MIN2((jint)(strlen((char*)initial_value)+1),
255 (jint)(PerfMaxStringConstLength+1)),
256 initial_value) {
257
258 if (PrintMiscellaneous && Verbose) {
259 if (is_valid() && initial_value != NULL &&
260 ((jint)strlen(initial_value) > (jint)PerfMaxStringConstLength)) {
261
262 warning("Truncating PerfStringConstant: name = %s,"
263 " length = " INT32_FORMAT ","
264 " PerfMaxStringConstLength = " INT32_FORMAT "\n",
265 namep,
266 (jint)strlen(initial_value),
267 (jint)PerfMaxStringConstLength);
268 }
269 }
270 }
271
272
273
274
275
276
277 void PerfDataManager::destroy() {
278
279 if (_all == NULL)
280 // destroy already called, or initialization never happened
281 return;
282
283 for (int index = 0; index < _all->length(); index++) {
284 PerfData* p = _all->at(index);
285 delete p;
286 }
287
288 delete(_all);
289 delete(_sampled);
290 delete(_constants);
291
292 _all = NULL;
293 _sampled = NULL;
294 _constants = NULL;
295 }
296
297 void PerfDataManager::add_item(PerfData* p, bool sampled) {
298
299 MutexLocker ml(PerfDataManager_lock);
300
301 if (_all == NULL) {
302 _all = new PerfDataList(100);
303 }
304
305 assert(!_all->contains(p->name()), "duplicate name added");
306
307 // add to the list of all perf data items
308 _all->append(p);
309
310 if (p->variability() == PerfData::V_Constant) {
311 if (_constants == NULL) {
312 _constants = new PerfDataList(25);
313 }
314 _constants->append(p);
315 return;
316 }
317
318 if (sampled) {
319 if (_sampled == NULL) {
320 _sampled = new PerfDataList(25);
321 }
322 _sampled->append(p);
323 }
324 }
325
326 PerfData* PerfDataManager::find_by_name(const char* name) {
327 return _all->find_by_name(name);
328 }
329
330 PerfDataList* PerfDataManager::all() {
331
332 MutexLocker ml(PerfDataManager_lock);
333
334 if (_all == NULL)
335 return NULL;
336
337 PerfDataList* clone = _all->clone();
338 return clone;
339 }
340
341 PerfDataList* PerfDataManager::sampled() {
342
343 MutexLocker ml(PerfDataManager_lock);
344
345 if (_sampled == NULL)
346 return NULL;
347
348 PerfDataList* clone = _sampled->clone();
349 return clone;
350 }
351
352 PerfDataList* PerfDataManager::constants() {
353
354 MutexLocker ml(PerfDataManager_lock);
355
356 if (_constants == NULL)
357 return NULL;
358
359 PerfDataList* clone = _constants->clone();
360 return clone;
361 }
362
363 char* PerfDataManager::counter_name(const char* ns, const char* name) {
364 assert(ns != NULL, "ns string required");
365 assert(name != NULL, "name string required");
366
367 size_t len = strlen(ns) + strlen(name) + 2;
368 char* result = NEW_RESOURCE_ARRAY(char, len);
369 sprintf(result, "%s.%s", ns, name);
370 return result;
371 }
372
373 char* PerfDataManager::name_space(const char* ns, const char* sub,
374 int instance) {
375 char intbuf[40];
376 jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
377 return name_space(ns, name_space(sub, intbuf));
378 }
379
380 char *PerfDataManager::name_space(const char* ns, int instance) {
381 char intbuf[40];
382 jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
383 return name_space(ns, intbuf);
384 }
385
386 PerfStringConstant* PerfDataManager::create_string_constant(CounterNS ns,
387 const char* name,
388 const char* s,
389 TRAPS) {
390
391 PerfStringConstant* p = new PerfStringConstant(ns, name, s);
392
393 if (!p->is_valid()) {
394 // allocation of native resources failed.
395 delete p;
396 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
397 }
398
399 add_item(p, false);
400
401 return p;
402 }
403
404 PerfLongConstant* PerfDataManager::create_long_constant(CounterNS ns,
405 const char* name,
406 PerfData::Units u,
407 jlong val, TRAPS) {
408
409 PerfLongConstant* p = new PerfLongConstant(ns, name, u, val);
410
411 if (!p->is_valid()) {
412 // allocation of native resources failed.
413 delete p;
414 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
415 }
416
417 add_item(p, false);
418
419 return p;
420 }
421
422 PerfStringVariable* PerfDataManager::create_string_variable(CounterNS ns,
423 const char* name,
424 jint max_length,
425 const char* s,
426 TRAPS) {
427
428 if (max_length == 0 && s != NULL) max_length = (jint)strlen(s);
429
430 assert(max_length != 0, "PerfStringVariable with length 0");
431
432 PerfStringVariable* p = new PerfStringVariable(ns, name, max_length, s);
433
434 if (!p->is_valid()) {
435 // allocation of native resources failed.
436 delete p;
437 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
438 }
439
440 add_item(p, false);
441
442 return p;
443 }
444
445 PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
446 const char* name,
447 PerfData::Units u,
448 jlong ival, TRAPS) {
449
450 PerfLongVariable* p = new PerfLongVariable(ns, name, u, ival);
451
452 if (!p->is_valid()) {
453 // allocation of native resources failed.
454 delete p;
455 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
456 }
457
458 add_item(p, false);
459
460 return p;
461 }
462
463 PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
464 const char* name,
465 PerfData::Units u,
466 jlong* sp, TRAPS) {
467
468 // Sampled counters not supported if UsePerfData is false
469 if (!UsePerfData) return NULL;
470
471 PerfLongVariable* p = new PerfLongVariable(ns, name, u, sp);
472
473 if (!p->is_valid()) {
474 // allocation of native resources failed.
475 delete p;
476 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
477 }
478
479 add_item(p, true);
480
481 return p;
482 }
483
484 PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
485 const char* name,
486 PerfData::Units u,
487 PerfSampleHelper* sh,
488 TRAPS) {
489
490 // Sampled counters not supported if UsePerfData is false
491 if (!UsePerfData) return NULL;
492
493 PerfLongVariable* p = new PerfLongVariable(ns, name, u, sh);
494
495 if (!p->is_valid()) {
496 // allocation of native resources failed.
497 delete p;
498 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
499 }
500
501 add_item(p, true);
502
503 return p;
504 }
505
506 PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
507 const char* name,
508 PerfData::Units u,
509 jlong ival, TRAPS) {
510
511 PerfLongCounter* p = new PerfLongCounter(ns, name, u, ival);
512
513 if (!p->is_valid()) {
514 // allocation of native resources failed.
515 delete p;
516 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
517 }
518
519 add_item(p, false);
520
521 return p;
522 }
523
524 PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
525 const char* name,
526 PerfData::Units u,
527 jlong* sp, TRAPS) {
528
529 // Sampled counters not supported if UsePerfData is false
530 if (!UsePerfData) return NULL;
531
532 PerfLongCounter* p = new PerfLongCounter(ns, name, u, sp);
533
534 if (!p->is_valid()) {
535 // allocation of native resources failed.
536 delete p;
537 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
538 }
539
540 add_item(p, true);
541
542 return p;
543 }
544
545 PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
546 const char* name,
547 PerfData::Units u,
548 PerfSampleHelper* sh,
549 TRAPS) {
550
551 // Sampled counters not supported if UsePerfData is false
552 if (!UsePerfData) return NULL;
553
554 PerfLongCounter* p = new PerfLongCounter(ns, name, u, sh);
555
556 if (!p->is_valid()) {
557 // allocation of native resources failed.
558 delete p;
559 THROW_0(vmSymbols::java_lang_OutOfMemoryError());
560 }
561
562 add_item(p, true);
563
564 return p;
565 }
566
567 PerfDataList::PerfDataList(int length) {
568
569 _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(length, true);
570 }
571
572 PerfDataList::PerfDataList(PerfDataList* p) {
573
574 _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(p->length(), true);
575
576 _set->appendAll(p->get_impl());
577 }
578
579 PerfDataList::~PerfDataList() {
580
581 delete _set;
582
583 }
584
585 bool PerfDataList::by_name(void* name, PerfData* pd) {
586
587 if (pd == NULL)
588 return false;
589
590 return strcmp((const char*)name, pd->name()) == 0;
591 }
592
593 PerfData* PerfDataList::find_by_name(const char* name) {
594
595 // if add_item hasn't been called the list won't be initialized
596 if (this == NULL)
597 return NULL;
598
599 int i = _set->find((void*)name, PerfDataList::by_name);
600
601 if (i >= 0 && i <= _set->length())
602 return _set->at(i);
603 else
604 return NULL;
605 }
606
607 PerfDataList* PerfDataList::clone() {
608
609 PerfDataList* copy = new PerfDataList(this);
610
611 assert(copy != NULL, "just checking");
612
613 return copy;
614 }