perfData.cpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 2001, 2010, 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
37PerfDataList*   PerfDataManager::_all = NULL;
38PerfDataList*   PerfDataManager::_sampled = NULL;
39PerfDataList*   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 */
48const 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
78PerfData::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);
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
112PerfData::~PerfData() {
113  if (_name != NULL) {
114    FREE_C_HEAP_ARRAY(char, _name);
115  }
116  if (is_on_c_heap()) {
117    FREE_C_HEAP_ARRAY(PerfDataEntry, _pdep);
118  }
119}
120
121void 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);
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
188PerfLong::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
194int PerfLong::format(char* buffer, int length) {
195  return jio_snprintf(buffer, length,"%lld", *(jlong*)_valuep);
196}
197
198PerfLongVariant::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
206PerfLongVariant::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
214void PerfLongVariant::sample() {
215
216  assert(_sample_helper != NULL || _sampled != NULL, "unexpected state");
217
218  if (_sample_helper != NULL) {
219    *(jlong*)_valuep = _sample_helper->take_sample();
220  }
221  else if (_sampled != NULL) {
222    *(jlong*)_valuep = *_sampled;
223  }
224}
225
226PerfByteArray::PerfByteArray(CounterNS ns, const char* namep, Units u,
227                             Variability v, jint length)
228                            : PerfData(ns, namep, u, v), _length(length) {
229
230  create_entry(T_BYTE, sizeof(jbyte), (size_t)_length);
231}
232
233void PerfString::set_string(const char* s2) {
234
235  // copy n bytes of the string, assuring the null string is
236  // copied if s2 == NULL.
237  strncpy((char *)_valuep, s2 == NULL ? "" : s2, _length);
238
239  // assure the string is null terminated when strlen(s2) >= _length
240  ((char*)_valuep)[_length-1] = '\0';
241}
242
243int PerfString::format(char* buffer, int length) {
244  return jio_snprintf(buffer, length, "%s", (char*)_valuep);
245}
246
247PerfStringConstant::PerfStringConstant(CounterNS ns, const char* namep,
248                                       const char* initial_value)
249                     : PerfString(ns, namep, V_Constant,
250                                  initial_value == NULL ? 1 :
251                                  MIN2((jint)(strlen((char*)initial_value)+1),
252                                       (jint)(PerfMaxStringConstLength+1)),
253                                  initial_value) {
254
255  if (PrintMiscellaneous && Verbose) {
256    if (is_valid() && initial_value != NULL &&
257        ((jint)strlen(initial_value) > (jint)PerfMaxStringConstLength)) {
258
259      warning("Truncating PerfStringConstant: name = %s,"
260              " length = " INT32_FORMAT ","
261              " PerfMaxStringConstLength = " INT32_FORMAT "\n",
262              namep,
263              (jint)strlen(initial_value),
264              (jint)PerfMaxStringConstLength);
265    }
266  }
267}
268
269
270
271
272
273
274void PerfDataManager::destroy() {
275
276  if (_all == NULL)
277    // destroy already called, or initialization never happened
278    return;
279
280  for (int index = 0; index < _all->length(); index++) {
281    PerfData* p = _all->at(index);
282    delete p;
283  }
284
285  delete(_all);
286  delete(_sampled);
287  delete(_constants);
288
289  _all = NULL;
290  _sampled = NULL;
291  _constants = NULL;
292}
293
294void PerfDataManager::add_item(PerfData* p, bool sampled) {
295
296  MutexLocker ml(PerfDataManager_lock);
297
298  if (_all == NULL) {
299    _all = new PerfDataList(100);
300  }
301
302  assert(!_all->contains(p->name()), "duplicate name added");
303
304  // add to the list of all perf data items
305  _all->append(p);
306
307  if (p->variability() == PerfData::V_Constant) {
308    if (_constants == NULL) {
309      _constants = new PerfDataList(25);
310    }
311    _constants->append(p);
312    return;
313  }
314
315  if (sampled) {
316    if (_sampled == NULL) {
317      _sampled = new PerfDataList(25);
318    }
319    _sampled->append(p);
320  }
321}
322
323PerfDataList* PerfDataManager::all() {
324
325  MutexLocker ml(PerfDataManager_lock);
326
327  if (_all == NULL)
328    return NULL;
329
330  PerfDataList* clone = _all->clone();
331  return clone;
332}
333
334PerfDataList* PerfDataManager::sampled() {
335
336  MutexLocker ml(PerfDataManager_lock);
337
338  if (_sampled == NULL)
339    return NULL;
340
341  PerfDataList* clone = _sampled->clone();
342  return clone;
343}
344
345PerfDataList* PerfDataManager::constants() {
346
347  MutexLocker ml(PerfDataManager_lock);
348
349  if (_constants == NULL)
350    return NULL;
351
352  PerfDataList* clone = _constants->clone();
353  return clone;
354}
355
356char* PerfDataManager::counter_name(const char* ns, const char* name) {
357   assert(ns != NULL, "ns string required");
358   assert(name != NULL, "name string required");
359
360   size_t len = strlen(ns) + strlen(name) + 2;
361   char* result = NEW_RESOURCE_ARRAY(char, len);
362   sprintf(result, "%s.%s", ns, name);
363   return result;
364}
365
366char* PerfDataManager::name_space(const char* ns, const char* sub,
367                                  int instance) {
368   char intbuf[40];
369   jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
370   return name_space(ns, name_space(sub, intbuf));
371}
372
373char *PerfDataManager::name_space(const char* ns, int instance) {
374   char intbuf[40];
375   jio_snprintf(intbuf, 40, UINT32_FORMAT, instance);
376   return name_space(ns, intbuf);
377}
378
379PerfStringConstant* PerfDataManager::create_string_constant(CounterNS ns,
380                                                            const char* name,
381                                                            const char* s,
382                                                            TRAPS) {
383
384  PerfStringConstant* p = new PerfStringConstant(ns, name, s);
385
386  if (!p->is_valid()) {
387    // allocation of native resources failed.
388    delete p;
389    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
390  }
391
392  add_item(p, false);
393
394  return p;
395}
396
397PerfLongConstant* PerfDataManager::create_long_constant(CounterNS ns,
398                                                        const char* name,
399                                                        PerfData::Units u,
400                                                        jlong val, TRAPS) {
401
402  PerfLongConstant* p = new PerfLongConstant(ns, name, u, val);
403
404  if (!p->is_valid()) {
405    // allocation of native resources failed.
406    delete p;
407    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
408  }
409
410  add_item(p, false);
411
412  return p;
413}
414
415PerfStringVariable* PerfDataManager::create_string_variable(CounterNS ns,
416                                                            const char* name,
417                                                            jint max_length,
418                                                            const char* s,
419                                                            TRAPS) {
420
421  if (max_length == 0 && s != NULL) max_length = (jint)strlen(s);
422
423  assert(max_length != 0, "PerfStringVariable with length 0");
424
425  PerfStringVariable* p = new PerfStringVariable(ns, name, max_length, s);
426
427  if (!p->is_valid()) {
428    // allocation of native resources failed.
429    delete p;
430    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
431  }
432
433  add_item(p, false);
434
435  return p;
436}
437
438PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
439                                                        const char* name,
440                                                        PerfData::Units u,
441                                                        jlong ival, TRAPS) {
442
443  PerfLongVariable* p = new PerfLongVariable(ns, name, u, ival);
444
445  if (!p->is_valid()) {
446    // allocation of native resources failed.
447    delete p;
448    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
449  }
450
451  add_item(p, false);
452
453  return p;
454}
455
456PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
457                                                        const char* name,
458                                                        PerfData::Units u,
459                                                        jlong* sp, TRAPS) {
460
461  // Sampled counters not supported if UsePerfData is false
462  if (!UsePerfData) return NULL;
463
464  PerfLongVariable* p = new PerfLongVariable(ns, name, u, sp);
465
466  if (!p->is_valid()) {
467    // allocation of native resources failed.
468    delete p;
469    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
470  }
471
472  add_item(p, true);
473
474  return p;
475}
476
477PerfLongVariable* PerfDataManager::create_long_variable(CounterNS ns,
478                                                        const char* name,
479                                                        PerfData::Units u,
480                                                        PerfSampleHelper* sh,
481                                                        TRAPS) {
482
483  // Sampled counters not supported if UsePerfData is false
484  if (!UsePerfData) return NULL;
485
486  PerfLongVariable* p = new PerfLongVariable(ns, name, u, sh);
487
488  if (!p->is_valid()) {
489    // allocation of native resources failed.
490    delete p;
491    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
492  }
493
494  add_item(p, true);
495
496  return p;
497}
498
499PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
500                                                      const char* name,
501                                                      PerfData::Units u,
502                                                      jlong ival, TRAPS) {
503
504  PerfLongCounter* p = new PerfLongCounter(ns, name, u, ival);
505
506  if (!p->is_valid()) {
507    // allocation of native resources failed.
508    delete p;
509    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
510  }
511
512  add_item(p, false);
513
514  return p;
515}
516
517PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
518                                                      const char* name,
519                                                      PerfData::Units u,
520                                                      jlong* sp, TRAPS) {
521
522  // Sampled counters not supported if UsePerfData is false
523  if (!UsePerfData) return NULL;
524
525  PerfLongCounter* p = new PerfLongCounter(ns, name, u, sp);
526
527  if (!p->is_valid()) {
528    // allocation of native resources failed.
529    delete p;
530    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
531  }
532
533  add_item(p, true);
534
535  return p;
536}
537
538PerfLongCounter* PerfDataManager::create_long_counter(CounterNS ns,
539                                                      const char* name,
540                                                      PerfData::Units u,
541                                                      PerfSampleHelper* sh,
542                                                      TRAPS) {
543
544  // Sampled counters not supported if UsePerfData is false
545  if (!UsePerfData) return NULL;
546
547  PerfLongCounter* p = new PerfLongCounter(ns, name, u, sh);
548
549  if (!p->is_valid()) {
550    // allocation of native resources failed.
551    delete p;
552    THROW_0(vmSymbols::java_lang_OutOfMemoryError());
553  }
554
555  add_item(p, true);
556
557  return p;
558}
559
560PerfDataList::PerfDataList(int length) {
561
562  _set = new(ResourceObj::C_HEAP) PerfDataArray(length, true);
563}
564
565PerfDataList::PerfDataList(PerfDataList* p) {
566
567  _set = new(ResourceObj::C_HEAP) PerfDataArray(p->length(), true);
568
569  _set->appendAll(p->get_impl());
570}
571
572PerfDataList::~PerfDataList() {
573
574  delete _set;
575
576}
577
578bool PerfDataList::by_name(void* name, PerfData* pd) {
579
580  if (pd == NULL)
581    return false;
582
583  return strcmp((const char*)name, pd->name()) == 0;
584}
585
586PerfData* PerfDataList::find_by_name(const char* name) {
587
588  int i = _set->find((void*)name, PerfDataList::by_name);
589
590  if (i >= 0 && i <= _set->length())
591    return _set->at(i);
592  else
593    return NULL;
594}
595
596PerfDataList* PerfDataList::clone() {
597
598  PerfDataList* copy = new PerfDataList(this);
599
600  assert(copy != NULL, "just checking");
601
602  return copy;
603}
604