perfData.cpp revision 6412:53a41e7cbe05 
1/*
2 * Copyright (c) 2001, 2014, 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
37PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
38
39PerfDataList*   PerfDataManager::_all = NULL;
40PerfDataList*   PerfDataManager::_sampled = NULL;
41PerfDataList*   PerfDataManager::_constants = NULL;
42
43/*
44 * The jvmstat global and subsystem jvmstat counter name spaces. The top
45 * level name spaces imply the interface stability level of the counter,
46 * which generally follows the Java package, class, and property naming
47 * conventions. The CounterNS enumeration values should be used to index
48 * into this array.
49 */
50const char* PerfDataManager::_name_spaces[] = {
51  // top level name spaces
52  "java",                   // stable and supported name space
53  "com.sun",                // unstable but supported name space
54  "sun",                    // unstable and unsupported name space
55  // subsystem name spaces
56  "java.gc",                // Garbage Collection name spaces
57  "com.sun.gc",
58  "sun.gc",
59  "java.ci",                // Compiler name spaces
60  "com.sun.ci",
61  "sun.ci",
62  "java.cls",               // Class Loader name spaces
63  "com.sun.cls",
64  "sun.cls",
65  "java.rt",                // Runtime name spaces
66  "com.sun.rt",
67  "sun.rt",
68  "java.os",                // Operating System name spaces
69  "com.sun.os",
70  "sun.os",
71  "java.threads",           // Threads System name spaces
72  "com.sun.threads",
73  "sun.threads",
74  "java.property",          // Java Property name spaces
75  "com.sun.property",
76  "sun.property",
77  "",
78};
79
80PerfData::PerfData(CounterNS ns, const char* name, Units u, Variability v)
81                  : _name(NULL), _u(u), _v(v), _valuep(NULL),
82                    _on_c_heap(false) {
83
84  const char* prefix = PerfDataManager::ns_to_string(ns);
85
86  _name = NEW_C_HEAP_ARRAY(char, strlen(name) + strlen(prefix) + 2, mtInternal);
87  assert(_name != NULL && strlen(name) != 0, "invalid name");
88
89  if (ns == NULL_NS) {
90     // No prefix is added to counters with the NULL_NS namespace.
91     strcpy(_name, name);
92     // set the F_Supported flag based on the counter name prefix.
93     if (PerfDataManager::is_stable_supported(_name) ||
94         PerfDataManager::is_unstable_supported(_name)) {
95       _flags = F_Supported;
96     }
97     else {
98       _flags = F_None;
99     }
100  }
101  else {
102    sprintf(_name, "%s.%s", prefix, name);
103    // set the F_Supported flag based on the given namespace.
104    if (PerfDataManager::is_stable_supported(ns) ||
105        PerfDataManager::is_unstable_supported(ns)) {
106      _flags = F_Supported;
107    }
108    else {
109      _flags = F_None;
110    }
111  }
112}
113
114PerfData::~PerfData() {
115  if (_name != NULL) {
116    FREE_C_HEAP_ARRAY(char, _name, mtInternal);
117  }
118  if (is_on_c_heap()) {
119    FREE_C_HEAP_ARRAY(PerfDataEntry, _pdep, mtInternal);
120  }
121}
122
123void PerfData::create_entry(BasicType dtype, size_t dsize, size_t vlen) {
124
125  size_t dlen = vlen==0 ? 1 : vlen;
126
127  size_t namelen = strlen(name()) + 1;  // include null terminator
128  size_t size = sizeof(PerfDataEntry) + namelen;
129  size_t pad_length = ((size % dsize) == 0) ? 0 : dsize - (size % dsize);
130  size += pad_length;
131  size_t data_start = size;
132  size += (dsize * dlen);
133
134  // align size to assure allocation in units of 8 bytes
135  int align = sizeof(jlong) - 1;
136  size = ((size + align) & ~align);
137  char* psmp = PerfMemory::alloc(size);
138
139  if (psmp == NULL) {
140    // out of PerfMemory memory resources. allocate on the C heap
141    // to avoid vm termination.
142    psmp = NEW_C_HEAP_ARRAY(char, size, mtInternal);
143    _on_c_heap = true;
144  }
145
146  // compute the addresses for the name and data
147  char* cname = psmp + sizeof(PerfDataEntry);
148
149  // data is in the last dsize*dlen bytes of the entry
150  void* valuep = (void*) (psmp + data_start);
151
152  assert(is_on_c_heap() || PerfMemory::contains(cname), "just checking");
153  assert(is_on_c_heap() || PerfMemory::contains((char*)valuep), "just checking");
154
155  // copy the name, including null terminator, into PerfData memory
156  strcpy(cname, name());
157
158
159  // set the header values in PerfData memory
160  PerfDataEntry* pdep = (PerfDataEntry*)psmp;
161  pdep->entry_length = (jint)size;
162  pdep->name_offset = (jint) ((uintptr_t) cname - (uintptr_t) psmp);
163  pdep->vector_length = (jint)vlen;
164  pdep->data_type = (jbyte) type2char(dtype);
165  pdep->data_units = units();
166  pdep->data_variability = variability();
167  pdep->flags = (jbyte)flags();
168  pdep->data_offset = (jint) data_start;
169
170  if (PerfTraceDataCreation) {
171    tty->print("name = %s, dtype = %d, variability = %d,"
172               " units = %d, dsize = %d, vlen = %d,"
173               " pad_length = %d, size = %d, on_c_heap = %s,"
174               " address = " INTPTR_FORMAT ","
175               " data address = " INTPTR_FORMAT "\n",
176               cname, dtype, variability(),
177               units(), dsize, vlen,
178               pad_length, size, is_on_c_heap() ? "TRUE":"FALSE",
179               psmp, valuep);
180  }
181
182  // record the start of the entry and the location of the data field.
183  _pdep = pdep;
184  _valuep = valuep;
185
186  // mark the PerfData memory region as having been updated.
187  PerfMemory::mark_updated();
188}
189
190PerfLong::PerfLong(CounterNS ns, const char* namep, Units u, Variability v)
191                 : PerfData(ns, namep, u, v) {
192
193  create_entry(T_LONG, sizeof(jlong));
194}
195
196int PerfLong::format(char* buffer, int length) {
197  return jio_snprintf(buffer, length, JLONG_FORMAT, *(jlong*)_valuep);
198}
199
200PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
201                                 Variability v, jlong* sampled)
202                                : PerfLong(ns, namep, u, v),
203                                  _sampled(sampled), _sample_helper(NULL) {
204
205  sample();
206}
207
208PerfLongVariant::PerfLongVariant(CounterNS ns, const char* namep, Units u,
209                                 Variability v, PerfLongSampleHelper* helper)
210                                : PerfLong(ns, namep, u, v),
211                                  _sampled(NULL), _sample_helper(helper) {
212
213  sample();
214}
215
216void PerfLongVariant::sample() {
217
218  // JJJ - This should not happen.  Maybe the first sample is taken
219  // while the _sample_helper is being null'ed out.
220  // assert(_sample_helper != NULL || _sampled != NULL, "unexpected state");
221  if (_sample_helper == NULL) return;
222
223  if (_sample_helper != NULL) {
224    *(jlong*)_valuep = _sample_helper->take_sample();
225  }
226  else if (_sampled != NULL) {
227    *(jlong*)_valuep = *_sampled;
228  }
229}
230
231PerfByteArray::PerfByteArray(CounterNS ns, const char* namep, Units u,
232                             Variability v, jint length)
233                            : PerfData(ns, namep, u, v), _length(length) {
234
235  create_entry(T_BYTE, sizeof(jbyte), (size_t)_length);
236}
237
238void PerfString::set_string(const char* s2) {
239
240  // copy n bytes of the string, assuring the null string is
241  // copied if s2 == NULL.
242  strncpy((char *)_valuep, s2 == NULL ? "" : s2, _length);
243
244  // assure the string is null terminated when strlen(s2) >= _length
245  ((char*)_valuep)[_length-1] = '\0';
246}
247
248int PerfString::format(char* buffer, int length) {
249  return jio_snprintf(buffer, length, "%s", (char*)_valuep);
250}
251
252PerfStringConstant::PerfStringConstant(CounterNS ns, const char* namep,
253                                       const char* initial_value)
254                     : PerfString(ns, namep, V_Constant,
255                                  initial_value == NULL ? 1 :
256                                  MIN2((jint)(strlen((char*)initial_value)+1),
257                                       (jint)(PerfMaxStringConstLength+1)),
258                                  initial_value) {
259
260  if (PrintMiscellaneous && Verbose) {
261    if (is_valid() && initial_value != NULL &&
262        ((jint)strlen(initial_value) > (jint)PerfMaxStringConstLength)) {
263
264      warning("Truncating PerfStringConstant: name = %s,"
265              " length = " INT32_FORMAT ","
266              " PerfMaxStringConstLength = " INT32_FORMAT "\n",
267              namep,
268              (jint)strlen(initial_value),
269              (jint)PerfMaxStringConstLength);
270    }
271  }
272}
273
274
275
276
277
278
279void PerfDataManager::destroy() {
280
281  if (_all == NULL)
282    // destroy already called, or initialization never happened
283    return;
284
285  for (int index = 0; index < _all->length(); index++) {
286    PerfData* p = _all->at(index);
287    delete p;
288  }
289
290  delete(_all);
291  delete(_sampled);
292  delete(_constants);
293
294  _all = NULL;
295  _sampled = NULL;
296  _constants = NULL;
297}
298
299void PerfDataManager::add_item(PerfData* p, bool sampled) {
300
301  MutexLocker ml(PerfDataManager_lock);
302
303  if (_all == NULL) {
304    _all = new PerfDataList(100);
305  }
306
307  assert(!_all->contains(p->name()), "duplicate name added");
308
309  // add to the list of all perf data items
310  _all->append(p);
311
312  if (p->variability() == PerfData::V_Constant) {
313    if (_constants == NULL) {
314      _constants = new PerfDataList(25);
315    }
316    _constants->append(p);
317    return;
318  }
319
320  if (sampled) {
321    if (_sampled == NULL) {
322      _sampled = new PerfDataList(25);
323    }
324    _sampled->append(p);
325  }
326}
327
328PerfData* PerfDataManager::find_by_name(const char* name) {
329  return _all->find_by_name(name);
330}
331
332PerfDataList* PerfDataManager::all() {
333
334  MutexLocker ml(PerfDataManager_lock);
335
336  if (_all == NULL)
337    return NULL;
338
339  PerfDataList* clone = _all->clone();
340  return clone;
341}
342
343PerfDataList* PerfDataManager::sampled() {
344
345  MutexLocker ml(PerfDataManager_lock);
346
347  if (_sampled == NULL)
348    return NULL;
349
350  PerfDataList* clone = _sampled->clone();
351  return clone;
352}
353
354PerfDataList* PerfDataManager::constants() {
355
356  MutexLocker ml(PerfDataManager_lock);
357
358  if (_constants == NULL)
359    return NULL;
360
361  PerfDataList* clone = _constants->clone();
362  return clone;
363}
364
365char* PerfDataManager::counter_name(const char* ns, const char* name) {
366   assert(ns != NULL, "ns string required");
367   assert(name != NULL, "name string required");
368
369   size_t len = strlen(ns) + strlen(name) + 2;
370   char* result = NEW_RESOURCE_ARRAY(char, len);
371   sprintf(result, "%s.%s", ns, name);
372   return result;
373}
374
375char* PerfDataManager::name_space(const char* ns, const char* sub,
376                                  int instance) {
377   char intbuf[40];
378   jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
379   return name_space(ns, name_space(sub, intbuf));
380}
381
382char *PerfDataManager::name_space(const char* ns, int instance) {
383   char intbuf[40];
384   jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
385   return name_space(ns, intbuf);
386}
387
388PerfStringConstant* PerfDataManager::create_string_constant(CounterNS ns,
389                                                            const char* name,
390                                                            const char* s,
391                                                            TRAPS) {
392
393  PerfStringConstant* p = new PerfStringConstant(ns, name, s);
394
395  if (!p->is_valid()) {
396    // allocation of native resources failed.
397    delete p;
398    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
399  }
400
401  add_item(p, false);
402
403  return p;
404}
405
406PerfLongConstant* PerfDataManager::create_long_constant(CounterNS ns,
407                                                        const char* name,
408                                                        PerfData::Units u,
409                                                        jlong val, TRAPS) {
410
411  PerfLongConstant* p = new PerfLongConstant(ns, name, u, val);
412
413  if (!p->is_valid()) {
414    // allocation of native resources failed.
415    delete p;
416    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
417  }
418
419  add_item(p, false);
420
421  return p;
422}
423
424PerfStringVariable* PerfDataManager::create_string_variable(CounterNS ns,
425                                                            const char* name,
426                                                            jint max_length,
427                                                            const char* s,
428                                                            TRAPS) {
429
430  if (max_length == 0 && s != NULL) max_length = (jint)strlen(s);
431
432  assert(max_length != 0, "PerfStringVariable with length 0");
433
434  PerfStringVariable* p = new PerfStringVariable(ns, name, max_length, s);
435
436  if (!p->is_valid()) {
437    // allocation of native resources failed.
438    delete p;
439    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
440  }
441
442  add_item(p, false);
443
444  return p;
445}
446
447PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
448                                                        const char* name,
449                                                        PerfData::Units u,
450                                                        jlong ival, TRAPS) {
451
452  PerfLongVariable* p = new PerfLongVariable(ns, name, u, ival);
453
454  if (!p->is_valid()) {
455    // allocation of native resources failed.
456    delete p;
457    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
458  }
459
460  add_item(p, false);
461
462  return p;
463}
464
465PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
466                                                        const char* name,
467                                                        PerfData::Units u,
468                                                        jlong* sp, TRAPS) {
469
470  // Sampled counters not supported if UsePerfData is false
471  if (!UsePerfData) return NULL;
472
473  PerfLongVariable* p = new PerfLongVariable(ns, name, u, sp);
474
475  if (!p->is_valid()) {
476    // allocation of native resources failed.
477    delete p;
478    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
479  }
480
481  add_item(p, true);
482
483  return p;
484}
485
486PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
487                                                        const char* name,
488                                                        PerfData::Units u,
489                                                        PerfSampleHelper* sh,
490                                                        TRAPS) {
491
492  // Sampled counters not supported if UsePerfData is false
493  if (!UsePerfData) return NULL;
494
495  PerfLongVariable* p = new PerfLongVariable(ns, name, u, sh);
496
497  if (!p->is_valid()) {
498    // allocation of native resources failed.
499    delete p;
500    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
501  }
502
503  add_item(p, true);
504
505  return p;
506}
507
508PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
509                                                      const char* name,
510                                                      PerfData::Units u,
511                                                      jlong ival, TRAPS) {
512
513  PerfLongCounter* p = new PerfLongCounter(ns, name, u, ival);
514
515  if (!p->is_valid()) {
516    // allocation of native resources failed.
517    delete p;
518    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
519  }
520
521  add_item(p, false);
522
523  return p;
524}
525
526PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
527                                                      const char* name,
528                                                      PerfData::Units u,
529                                                      jlong* sp, TRAPS) {
530
531  // Sampled counters not supported if UsePerfData is false
532  if (!UsePerfData) return NULL;
533
534  PerfLongCounter* p = new PerfLongCounter(ns, name, u, sp);
535
536  if (!p->is_valid()) {
537    // allocation of native resources failed.
538    delete p;
539    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
540  }
541
542  add_item(p, true);
543
544  return p;
545}
546
547PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
548                                                      const char* name,
549                                                      PerfData::Units u,
550                                                      PerfSampleHelper* sh,
551                                                      TRAPS) {
552
553  // Sampled counters not supported if UsePerfData is false
554  if (!UsePerfData) return NULL;
555
556  PerfLongCounter* p = new PerfLongCounter(ns, name, u, sh);
557
558  if (!p->is_valid()) {
559    // allocation of native resources failed.
560    delete p;
561    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
562  }
563
564  add_item(p, true);
565
566  return p;
567}
568
569PerfDataList::PerfDataList(int length) {
570
571  _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(length, true);
572}
573
574PerfDataList::PerfDataList(PerfDataList* p) {
575
576  _set = new(ResourceObj::C_HEAP, mtInternal) PerfDataArray(p->length(), true);
577
578  _set->appendAll(p->get_impl());
579}
580
581PerfDataList::~PerfDataList() {
582
583  delete _set;
584
585}
586
587bool PerfDataList::by_name(void* name, PerfData* pd) {
588
589  if (pd == NULL)
590    return false;
591
592  return strcmp((const char*)name, pd->name()) == 0;
593}
594
595PerfData* PerfDataList::find_by_name(const char* name) {
596
597  // if add_item hasn't been called the list won't be initialized
598  if (this == NULL)
599    return NULL;
600
601  int i = _set->find((void*)name, PerfDataList::by_name);
602
603  if (i >= 0 && i <= _set->length())
604    return _set->at(i);
605  else
606    return NULL;
607}
608
609PerfDataList* PerfDataList::clone() {
610
611  PerfDataList* copy = new PerfDataList(this);
612
613  assert(copy != NULL, "just checking");
614
615  return copy;
616}
617