src/hotspot/share/runtime/sweeper.cpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 47099 hotspot/src/share/vm/runtime/sweeper.cpp@49f5fa3fc2ae
child 48007 ab3959df2115
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
     1
/*
46702
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
     2
 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
     3
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
489c9b5090e2 Initial load
duke
parents:
diff changeset
     4
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
     5
 * This code is free software; you can redistribute it and/or modify it
489c9b5090e2 Initial load
duke
parents:
diff changeset
     6
 * under the terms of the GNU General Public License version 2 only, as
489c9b5090e2 Initial load
duke
parents:
diff changeset
     7
 * published by the Free Software Foundation.
489c9b5090e2 Initial load
duke
parents:
diff changeset
     8
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
     9
 * This code is distributed in the hope that it will be useful, but WITHOUT
489c9b5090e2 Initial load
duke
parents:
diff changeset
    10
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
489c9b5090e2 Initial load
duke
parents:
diff changeset
    11
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
489c9b5090e2 Initial load
duke
parents:
diff changeset
    12
 * version 2 for more details (a copy is included in the LICENSE file that
489c9b5090e2 Initial load
duke
parents:
diff changeset
    13
 * accompanied this code).
489c9b5090e2 Initial load
duke
parents:
diff changeset
    14
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
    15
 * You should have received a copy of the GNU General Public License version
489c9b5090e2 Initial load
duke
parents:
diff changeset
    16
 * 2 along with this work; if not, write to the Free Software Foundation,
489c9b5090e2 Initial load
duke
parents:
diff changeset
    17
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
489c9b5090e2 Initial load
duke
parents:
diff changeset
    18
 *
5547
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 5533
diff changeset
    19
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 5533
diff changeset
    20
 * or visit www.oracle.com if you need additional information or have any
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 5533
diff changeset
    21
 * questions.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    22
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
    23
 */
489c9b5090e2 Initial load
duke
parents:
diff changeset
    24
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    25
#include "precompiled.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    26
#include "code/codeCache.hpp"
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
    27
#include "code/compiledIC.hpp"
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
    28
#include "code/icBuffer.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    29
#include "code/nmethod.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    30
#include "compiler/compileBroker.hpp"
46701
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46269
diff changeset
    31
#include "logging/log.hpp"
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46269
diff changeset
    32
#include "logging/logStream.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    33
#include "memory/resourceArea.hpp"
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
    34
#include "oops/method.hpp"
40655
9f644073d3a0 8157907: Incorrect inclusion of atomic.hpp instead of atomic.inline.hpp
dholmes
parents: 38133
diff changeset
    35
#include "runtime/atomic.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    36
#include "runtime/compilationPolicy.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    37
#include "runtime/mutexLocker.hpp"
24351
61b33cc6d3cf 8042195: Introduce umbrella header orderAccess.inline.hpp.
goetz
parents: 22872
diff changeset
    38
#include "runtime/orderAccess.inline.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    39
#include "runtime/os.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    40
#include "runtime/sweeper.hpp"
24351
61b33cc6d3cf 8042195: Introduce umbrella header orderAccess.inline.hpp.
goetz
parents: 22872
diff changeset
    41
#include "runtime/thread.inline.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    42
#include "runtime/vm_operations.hpp"
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
    43
#include "trace/tracing.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    44
#include "utilities/events.hpp"
21767
41eaa9a17059 8028128: Add a type safe alternative for working with counter based data
mgronlun
parents: 21727
diff changeset
    45
#include "utilities/ticks.inline.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6453
diff changeset
    46
#include "utilities/xmlstream.hpp"
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    47
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    48
#ifdef ASSERT
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    49
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    50
#define SWEEP(nm) record_sweep(nm, __LINE__)
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    51
// Sweeper logging code
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    52
class SweeperRecord {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    53
 public:
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    54
  int traversal;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    55
  int compile_id;
47099
49f5fa3fc2ae 8186837: Memory ordering nmethod, _state and _stack_traversal_mark
rehn
parents: 46702
diff changeset
    56
  long traversal_mark;
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    57
  int state;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    58
  const char* kind;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    59
  address vep;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    60
  address uep;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    61
  int line;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    62
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    63
  void print() {
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
    64
      tty->print_cr("traversal = %d compile_id = %d %s uep = " PTR_FORMAT " vep = "
47099
49f5fa3fc2ae 8186837: Memory ordering nmethod, _state and _stack_traversal_mark
rehn
parents: 46702
diff changeset
    65
                    PTR_FORMAT " state = %d traversal_mark %ld line = %d",
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    66
                    traversal,
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    67
                    compile_id,
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    68
                    kind == NULL ? "" : kind,
33148
68fa8b6c4340 8042893: compiler: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents: 32466
diff changeset
    69
                    p2i(uep),
68fa8b6c4340 8042893: compiler: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents: 32466
diff changeset
    70
                    p2i(vep),
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    71
                    state,
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    72
                    traversal_mark,
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    73
                    line);
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    74
  }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    75
};
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    76
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    77
static int _sweep_index = 0;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    78
static SweeperRecord* _records = NULL;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    79
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    80
void NMethodSweeper::report_events(int id, address entry) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    81
  if (_records != NULL) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    82
    for (int i = _sweep_index; i < SweeperLogEntries; i++) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    83
      if (_records[i].uep == entry ||
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    84
          _records[i].vep == entry ||
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    85
          _records[i].compile_id == id) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    86
        _records[i].print();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    87
      }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    88
    }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    89
    for (int i = 0; i < _sweep_index; i++) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    90
      if (_records[i].uep == entry ||
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    91
          _records[i].vep == entry ||
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    92
          _records[i].compile_id == id) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    93
        _records[i].print();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    94
      }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    95
    }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    96
  }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    97
}
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    98
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
    99
void NMethodSweeper::report_events() {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   100
  if (_records != NULL) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   101
    for (int i = _sweep_index; i < SweeperLogEntries; i++) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   102
      // skip empty records
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   103
      if (_records[i].vep == NULL) continue;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   104
      _records[i].print();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   105
    }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   106
    for (int i = 0; i < _sweep_index; i++) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   107
      // skip empty records
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   108
      if (_records[i].vep == NULL) continue;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   109
      _records[i].print();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   110
    }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   111
  }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   112
}
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   113
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   114
void NMethodSweeper::record_sweep(CompiledMethod* nm, int line) {
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   115
  if (_records != NULL) {
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   116
    _records[_sweep_index].traversal = _traversals;
46702
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   117
    _records[_sweep_index].traversal_mark = nm->is_nmethod() ? ((nmethod*)nm)->stack_traversal_mark() : 0;
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   118
    _records[_sweep_index].compile_id = nm->compile_id();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   119
    _records[_sweep_index].kind = nm->compile_kind();
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   120
    _records[_sweep_index].state = nm->get_state();
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   121
    _records[_sweep_index].vep = nm->verified_entry_point();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   122
    _records[_sweep_index].uep = nm->entry_point();
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   123
    _records[_sweep_index].line = line;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   124
    _sweep_index = (_sweep_index + 1) % SweeperLogEntries;
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   125
  }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   126
}
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   127
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   128
void NMethodSweeper::init_sweeper_log() {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   129
 if (LogSweeper && _records == NULL) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   130
   // Create the ring buffer for the logging code
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   131
   _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   132
   memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   133
  }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   134
}
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   135
#else
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   136
#define SWEEP(nm)
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   137
#endif
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   138
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   139
CompiledMethodIterator NMethodSweeper::_current;               // Current compiled method
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   140
long     NMethodSweeper::_traversals                   = 0;    // Stack scan count, also sweep ID.
22210
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   141
long     NMethodSweeper::_total_nof_code_cache_sweeps  = 0;    // Total number of full sweeps of the code cache
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   142
long     NMethodSweeper::_time_counter                 = 0;    // Virtual time used to periodically invoke sweeper
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   143
long     NMethodSweeper::_last_sweep                   = 0;    // Value of _time_counter when the last sweep happened
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   144
int      NMethodSweeper::_seen                         = 0;    // Nof. nmethod we have currently processed in current pass of CodeCache
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   145
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   146
volatile bool NMethodSweeper::_should_sweep            = true; // Indicates if we should invoke the sweeper
30205
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   147
volatile bool NMethodSweeper::_force_sweep             = false;// Indicates if we should force a sweep
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   148
volatile int  NMethodSweeper::_bytes_changed           = 0;    // Counts the total nmethod size if the nmethod changed from:
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   149
                                                               //   1) alive       -> not_entrant
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   150
                                                               //   2) not_entrant -> zombie
22210
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   151
int    NMethodSweeper::_hotness_counter_reset_val       = 0;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   152
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   153
long   NMethodSweeper::_total_nof_methods_reclaimed     = 0;   // Accumulated nof methods flushed
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   154
long   NMethodSweeper::_total_nof_c2_methods_reclaimed  = 0;   // Accumulated nof methods flushed
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   155
size_t NMethodSweeper::_total_flushed_size              = 0;   // Total number of bytes flushed from the code cache
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   156
Tickspan NMethodSweeper::_total_time_sweeping;                 // Accumulated time sweeping
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   157
Tickspan NMethodSweeper::_total_time_this_sweep;               // Total time this sweep
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   158
Tickspan NMethodSweeper::_peak_sweep_time;                     // Peak time for a full sweep
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   159
Tickspan NMethodSweeper::_peak_sweep_fraction_time;            // Peak time sweeping one fraction
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   160
28163
322d55d167be 8047290: Make Mutex::_no_safepoint_check_flag locks verify that this lock never checks for safepoint
coleenp
parents: 27917
diff changeset
   161
Monitor* NMethodSweeper::_stat_lock = new Monitor(Mutex::special, "Sweeper::Statistics", true, Monitor::_safepoint_check_sometimes);
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   162
3908
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   163
class MarkActivationClosure: public CodeBlobClosure {
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   164
public:
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   165
  virtual void do_code_blob(CodeBlob* cb) {
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   166
    assert(cb->is_nmethod(), "CodeBlob should be nmethod");
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   167
    nmethod* nm = (nmethod*)cb;
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   168
    nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   169
    // If we see an activation belonging to a non_entrant nmethod, we mark it.
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   170
    if (nm->is_not_entrant()) {
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   171
      nm->mark_as_seen_on_stack();
3908
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   172
    }
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   173
  }
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   174
};
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   175
static MarkActivationClosure mark_activation_closure;
24b55ad4c228 6863023: need non-perm oops in code cache for JSR 292
jrose
parents: 1
diff changeset
   176
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   177
class SetHotnessClosure: public CodeBlobClosure {
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   178
public:
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   179
  virtual void do_code_blob(CodeBlob* cb) {
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   180
    assert(cb->is_nmethod(), "CodeBlob should be nmethod");
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   181
    nmethod* nm = (nmethod*)cb;
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   182
    nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   183
  }
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   184
};
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   185
static SetHotnessClosure set_hotness_closure;
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   186
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   187
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   188
int NMethodSweeper::hotness_counter_reset_val() {
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   189
  if (_hotness_counter_reset_val == 0) {
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   190
    _hotness_counter_reset_val = (ReservedCodeCacheSize < M) ? 1 : (ReservedCodeCacheSize / M) * 2;
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   191
  }
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   192
  return _hotness_counter_reset_val;
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   193
}
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   194
bool NMethodSweeper::wait_for_stack_scanning() {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   195
  return _current.end();
17132
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   196
}
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   197
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   198
/**
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   199
  * Scans the stacks of all Java threads and marks activations of not-entrant methods.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   200
  * No need to synchronize access, since 'mark_active_nmethods' is always executed at a
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   201
  * safepoint.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   202
  */
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   203
void NMethodSweeper::mark_active_nmethods() {
46702
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   204
  CodeBlobClosure* cl = prepare_mark_active_nmethods();
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   205
  if (cl != NULL) {
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   206
    Threads::nmethods_do(cl);
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   207
  }
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   208
}
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   209
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   210
CodeBlobClosure* NMethodSweeper::prepare_mark_active_nmethods() {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   211
  assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   212
  // If we do not want to reclaim not-entrant or zombie methods there is no need
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   213
  // to scan stacks
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   214
  if (!MethodFlushing) {
46702
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   215
    return NULL;
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   216
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   217
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   218
  // Increase time so that we can estimate when to invoke the sweeper again.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   219
  _time_counter++;
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   220
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   221
  // Check for restart
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   222
  if (_current.method() != NULL) {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   223
    if (_current.method()->is_nmethod()) {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   224
      assert(CodeCache::find_blob_unsafe(_current.method()) == _current.method(), "Sweeper nmethod cached state invalid");
42650
1f304d0c888b 8171008: Integrate AOT compiler into JDK
kvn
parents: 40664
diff changeset
   225
    } else if (_current.method()->is_aot()) {
1f304d0c888b 8171008: Integrate AOT compiler into JDK
kvn
parents: 40664
diff changeset
   226
      assert(CodeCache::find_blob_unsafe(_current.method()->code_begin()) == _current.method(), "Sweeper AOT method cached state invalid");
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   227
    } else {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   228
      ShouldNotReachHere();
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   229
    }
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   230
  }
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   231
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   232
  if (wait_for_stack_scanning()) {
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   233
    _seen = 0;
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   234
    _current = CompiledMethodIterator();
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   235
    // Initialize to first nmethod
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   236
    _current.next();
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   237
    _traversals += 1;
21767
41eaa9a17059 8028128: Add a type safe alternative for working with counter based data
mgronlun
parents: 21727
diff changeset
   238
    _total_time_this_sweep = Tickspan();
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   239
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   240
    if (PrintMethodFlushing) {
33148
68fa8b6c4340 8042893: compiler: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents: 32466
diff changeset
   241
      tty->print_cr("### Sweep: stack traversal %ld", _traversals);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   242
    }
46702
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   243
    return &mark_activation_closure;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   244
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   245
  } else {
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   246
    // Only set hotness counter
46702
13ae789b982e 8180932: Parallelize safepoint cleanup
rkennke
parents: 46701
diff changeset
   247
    return &set_hotness_closure;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   248
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   249
489c9b5090e2 Initial load
duke
parents:
diff changeset
   250
}
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   251
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   252
/**
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   253
  * This function triggers a VM operation that does stack scanning of active
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   254
  * methods. Stack scanning is mandatory for the sweeper to make progress.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   255
  */
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   256
void NMethodSweeper::do_stack_scanning() {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   257
  assert(!CodeCache_lock->owned_by_self(), "just checking");
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   258
  if (wait_for_stack_scanning()) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   259
    VM_MarkActiveNMethods op;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   260
    VMThread::execute(&op);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   261
    _should_sweep = true;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   262
  }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   263
}
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   264
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   265
void NMethodSweeper::sweeper_loop() {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   266
  bool timeout;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   267
  while (true) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   268
    {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   269
      ThreadBlockInVM tbivm(JavaThread::current());
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   270
      MutexLockerEx waiter(CodeCache_lock, Mutex::_no_safepoint_check_flag);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   271
      const long wait_time = 60*60*24 * 1000;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   272
      timeout = CodeCache_lock->wait(Mutex::_no_safepoint_check_flag, wait_time);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   273
    }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   274
    if (!timeout) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   275
      possibly_sweep();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   276
    }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   277
  }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   278
}
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   279
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   280
/**
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   281
  * Wakes up the sweeper thread to possibly sweep.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   282
  */
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   283
void NMethodSweeper::notify(int code_blob_type) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   284
  // Makes sure that we do not invoke the sweeper too often during startup.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   285
  double start_threshold = 100.0 / (double)StartAggressiveSweepingAt;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   286
  double aggressive_sweep_threshold = MIN2(start_threshold, 1.1);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   287
  if (CodeCache::reverse_free_ratio(code_blob_type) >= aggressive_sweep_threshold) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   288
    assert_locked_or_safepoint(CodeCache_lock);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   289
    CodeCache_lock->notify();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   290
  }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   291
}
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   292
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   293
/**
30205
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   294
  * Wakes up the sweeper thread and forces a sweep. Blocks until it finished.
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   295
  */
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   296
void NMethodSweeper::force_sweep() {
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   297
  ThreadBlockInVM tbivm(JavaThread::current());
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   298
  MutexLockerEx waiter(CodeCache_lock, Mutex::_no_safepoint_check_flag);
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   299
  // Request forced sweep
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   300
  _force_sweep = true;
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   301
  while (_force_sweep) {
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   302
    // Notify sweeper that we want to force a sweep and wait for completion.
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   303
    // In case a sweep currently takes place we timeout and try again because
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   304
    // we want to enforce a full sweep.
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   305
    CodeCache_lock->notify();
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   306
    CodeCache_lock->wait(Mutex::_no_safepoint_check_flag, 1000);
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   307
  }
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   308
}
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   309
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   310
/**
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   311
 * Handle a safepoint request
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   312
 */
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   313
void NMethodSweeper::handle_safepoint_request() {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   314
  if (SafepointSynchronize::is_synchronizing()) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   315
    if (PrintMethodFlushing && Verbose) {
34158
1f8d643b02d5 8067378: Add segmented code heaps info into jfr events: vm/code_cache/stats and vm/code_cache/config
thartmann
parents: 33148
diff changeset
   316
      tty->print_cr("### Sweep at %d out of %d, yielding to safepoint", _seen, CodeCache::nmethod_count());
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   317
    }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   318
    MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   319
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   320
    JavaThread* thread = JavaThread::current();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   321
    ThreadBlockInVM tbivm(thread);
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   322
    thread->java_suspend_self();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   323
  }
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   324
}
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   325
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   326
/**
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   327
 * This function invokes the sweeper if at least one of the three conditions is met:
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   328
 *    (1) The code cache is getting full
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   329
 *    (2) There are sufficient state changes in/since the last sweep.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   330
 *    (3) We have not been sweeping for 'some time'
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   331
 */
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   332
void NMethodSweeper::possibly_sweep() {
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   333
  assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   334
  // If there was no state change while nmethod sweeping, 'should_sweep' will be false.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   335
  // This is one of the two places where should_sweep can be set to true. The general
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   336
  // idea is as follows: If there is enough free space in the code cache, there is no
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   337
  // need to invoke the sweeper. The following formula (which determines whether to invoke
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   338
  // the sweeper or not) depends on the assumption that for larger ReservedCodeCacheSizes
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   339
  // we need less frequent sweeps than for smaller ReservedCodecCacheSizes. Furthermore,
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   340
  // the formula considers how much space in the code cache is currently used. Here are
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   341
  // some examples that will (hopefully) help in understanding.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   342
  //
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   343
  // Small ReservedCodeCacheSizes:  (e.g., < 16M) We invoke the sweeper every time, since
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   344
  //                                              the result of the division is 0. This
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   345
  //                                              keeps the used code cache size small
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   346
  //                                              (important for embedded Java)
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   347
  // Large ReservedCodeCacheSize :  (e.g., 256M + code cache is 10% full). The formula
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   348
  //                                              computes: (256 / 16) - 1 = 15
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   349
  //                                              As a result, we invoke the sweeper after
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   350
  //                                              15 invocations of 'mark_active_nmethods.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   351
  // Large ReservedCodeCacheSize:   (e.g., 256M + code Cache is 90% full). The formula
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   352
  //                                              computes: (256 / 16) - 10 = 6.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   353
  if (!_should_sweep) {
22208
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   354
    const int time_since_last_sweep = _time_counter - _last_sweep;
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   355
    // ReservedCodeCacheSize has an 'unsigned' type. We need a 'signed' type for max_wait_time,
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   356
    // since 'time_since_last_sweep' can be larger than 'max_wait_time'. If that happens using
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   357
    // an unsigned type would cause an underflow (wait_until_next_sweep becomes a large positive
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   358
    // value) that disables the intended periodic sweeps.
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   359
    const int max_wait_time = ReservedCodeCacheSize / (16 * M);
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   360
    double wait_until_next_sweep = max_wait_time - time_since_last_sweep -
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   361
        MAX2(CodeCache::reverse_free_ratio(CodeBlobType::MethodProfiled),
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   362
             CodeCache::reverse_free_ratio(CodeBlobType::MethodNonProfiled));
22208
fb1e20bd389f 8029091: Bug in calculation of code cache sweeping interval
anoll
parents: 21767
diff changeset
   363
    assert(wait_until_next_sweep <= (double)max_wait_time, "Calculation of code cache sweeper interval is incorrect");
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   364
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   365
    if ((wait_until_next_sweep <= 0.0) || !CompileBroker::should_compile_new_jobs()) {
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   366
      _should_sweep = true;
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   367
    }
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   368
  }
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   369
30205
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   370
  // Remember if this was a forced sweep
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   371
  bool forced = _force_sweep;
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   372
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   373
  // Force stack scanning if there is only 10% free space in the code cache.
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   374
  // We force stack scanning only if the non-profiled code heap gets full, since critical
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   375
  // allocations go to the non-profiled heap and we must be make sure that there is
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   376
  // enough space.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   377
  double free_percent = 1 / CodeCache::reverse_free_ratio(CodeBlobType::MethodNonProfiled) * 100;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   378
  if (free_percent <= StartAggressiveSweepingAt) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   379
    do_stack_scanning();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   380
  }
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   381
30205
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   382
  if (_should_sweep || forced) {
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   383
    init_sweeper_log();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   384
    sweep_code_cache();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   385
  }
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   386
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   387
  // We are done with sweeping the code cache once.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   388
  _total_nof_code_cache_sweeps++;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   389
  _last_sweep = _time_counter;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   390
  // Reset flag; temporarily disables sweeper
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   391
  _should_sweep = false;
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   392
  // If there was enough state change, 'possibly_enable_sweeper()'
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   393
  // sets '_should_sweep' to true
30205
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   394
  possibly_enable_sweeper();
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   395
  // Reset _bytes_changed only if there was enough state change. _bytes_changed
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   396
  // can further increase by calls to 'report_state_change'.
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   397
  if (_should_sweep) {
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   398
    _bytes_changed = 0;
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   399
  }
30205
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   400
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   401
  if (forced) {
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   402
    // Notify requester that forced sweep finished
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   403
    assert(_force_sweep, "Should be a forced sweep");
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   404
    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   405
    _force_sweep = false;
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   406
    CodeCache_lock->notify();
0bff2f15867f 8075214: SIGSEGV in nmethod sweeping
thartmann
parents: 29339
diff changeset
   407
  }
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   408
}
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   409
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   410
void NMethodSweeper::sweep_code_cache() {
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   411
  ResourceMark rm;
21767
41eaa9a17059 8028128: Add a type safe alternative for working with counter based data
mgronlun
parents: 21727
diff changeset
   412
  Ticks sweep_start_counter = Ticks::now();
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   413
46269
7e725659ea12 8172286: CodeCacheFlushing message should be shown in UL
ysuenaga
parents: 42650
diff changeset
   414
  log_debug(codecache, sweep, start)("CodeCache flushing");
7e725659ea12 8172286: CodeCacheFlushing message should be shown in UL
ysuenaga
parents: 42650
diff changeset
   415
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   416
  int flushed_count                = 0;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   417
  int zombified_count              = 0;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   418
  int flushed_c2_count     = 0;
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   419
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   420
  if (PrintMethodFlushing && Verbose) {
34158
1f8d643b02d5 8067378: Add segmented code heaps info into jfr events: vm/code_cache/stats and vm/code_cache/config
thartmann
parents: 33148
diff changeset
   421
    tty->print_cr("### Sweep at %d out of %d", _seen, CodeCache::nmethod_count());
17132
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   422
  }
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   423
20019
3e9220f93c61 8022883: Assertion failed: sweptCount >= flushedCount + markedCount + zombifiedCount
anoll
parents: 18025
diff changeset
   424
  int swept_count = 0;
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   425
  assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here");
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   426
  assert(!CodeCache_lock->owned_by_self(), "just checking");
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   427
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   428
  int freed_memory = 0;
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   429
  {
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   430
    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   431
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   432
    while (!_current.end()) {
20019
3e9220f93c61 8022883: Assertion failed: sweptCount >= flushedCount + markedCount + zombifiedCount
anoll
parents: 18025
diff changeset
   433
      swept_count++;
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   434
      // Since we will give up the CodeCache_lock, always skip ahead
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   435
      // to the next nmethod.  Other blobs can be deleted by other
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   436
      // threads but nmethods are only reclaimed by the sweeper.
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   437
      CompiledMethod* nm = _current.method();
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   438
      _current.next();
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   439
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   440
      // Now ready to process nmethod and give up CodeCache_lock
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   441
      {
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   442
        MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   443
        // Save information before potentially flushing the nmethod
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   444
        // Only flushing nmethods so size only matters for them.
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   445
        int size = nm->is_nmethod() ? ((nmethod*)nm)->total_size() : 0;
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   446
        bool is_c2_method = nm->is_compiled_by_c2();
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   447
        bool is_osr = nm->is_osr_method();
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   448
        int compile_id = nm->compile_id();
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   449
        intptr_t address = p2i(nm);
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   450
        const char* state_before = nm->state();
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   451
        const char* state_after = "";
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   452
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   453
        MethodStateChange type = process_compiled_method(nm);
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   454
        switch (type) {
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   455
          case Flushed:
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   456
            state_after = "flushed";
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   457
            freed_memory += size;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   458
            ++flushed_count;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   459
            if (is_c2_method) {
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   460
              ++flushed_c2_count;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   461
            }
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   462
            break;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   463
          case MadeZombie:
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   464
            state_after = "made zombie";
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   465
            ++zombified_count;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   466
            break;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   467
          case None:
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   468
            break;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   469
          default:
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   470
           ShouldNotReachHere();
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   471
        }
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   472
        if (PrintMethodFlushing && Verbose && type != None) {
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   473
          tty->print_cr("### %s nmethod %3d/" PTR_FORMAT " (%s) %s", is_osr ? "osr" : "", compile_id, address, state_before, state_after);
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   474
        }
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   475
      }
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   476
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   477
      _seen++;
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   478
      handle_safepoint_request();
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   479
    }
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   480
  }
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   481
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   482
  assert(_current.end(), "must have scanned the whole cache");
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   483
21767
41eaa9a17059 8028128: Add a type safe alternative for working with counter based data
mgronlun
parents: 21727
diff changeset
   484
  const Ticks sweep_end_counter = Ticks::now();
41eaa9a17059 8028128: Add a type safe alternative for working with counter based data
mgronlun
parents: 21727
diff changeset
   485
  const Tickspan sweep_time = sweep_end_counter - sweep_start_counter;
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   486
  {
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   487
    MutexLockerEx mu(_stat_lock, Mutex::_no_safepoint_check_flag);
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   488
    _total_time_sweeping  += sweep_time;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   489
    _total_time_this_sweep += sweep_time;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   490
    _peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time);
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   491
    _total_flushed_size += freed_memory;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   492
    _total_nof_methods_reclaimed += flushed_count;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   493
    _total_nof_c2_methods_reclaimed += flushed_c2_count;
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   494
    _peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep);
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   495
  }
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   496
  EventSweepCodeCache event(UNTIMED);
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   497
  if (event.should_commit()) {
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   498
    event.set_starttime(sweep_start_counter);
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   499
    event.set_endtime(sweep_end_counter);
40664
1ec65b303bb7 8164523: Clean up metadata for event based tracing
egahlin
parents: 40655
diff changeset
   500
    event.set_sweepId(_traversals);
20019
3e9220f93c61 8022883: Assertion failed: sweptCount >= flushedCount + markedCount + zombifiedCount
anoll
parents: 18025
diff changeset
   501
    event.set_sweptCount(swept_count);
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   502
    event.set_flushedCount(flushed_count);
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   503
    event.set_zombifiedCount(zombified_count);
18025
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   504
    event.commit();
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   505
  }
b7bcf7497f93 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 17132
diff changeset
   506
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   507
#ifdef ASSERT
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   508
  if(PrintMethodFlushing) {
33148
68fa8b6c4340 8042893: compiler: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents: 32466
diff changeset
   509
    tty->print_cr("### sweeper:      sweep time(" JLONG_FORMAT "): ", sweep_time.value());
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   510
  }
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   511
#endif
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   512
46269
7e725659ea12 8172286: CodeCacheFlushing message should be shown in UL
ysuenaga
parents: 42650
diff changeset
   513
  Log(codecache, sweep) log;
7e725659ea12 8172286: CodeCacheFlushing message should be shown in UL
ysuenaga
parents: 42650
diff changeset
   514
  if (log.is_debug()) {
46701
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46269
diff changeset
   515
    LogStream ls(log.debug());
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46269
diff changeset
   516
    CodeCache::print_summary(&ls, false);
46269
7e725659ea12 8172286: CodeCacheFlushing message should be shown in UL
ysuenaga
parents: 42650
diff changeset
   517
  }
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   518
  log_sweep("finished");
17132
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   519
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   520
  // Sweeper is the only case where memory is released, check here if it
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   521
  // is time to restart the compiler. Only checking if there is a certain
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   522
  // amount of free memory in the code cache might lead to re-enabling
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   523
  // compilation although no memory has been released. For example, there are
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   524
  // cases when compilation was disabled although there is 4MB (or more) free
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   525
  // memory in the code cache. The reason is code cache fragmentation. Therefore,
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   526
  // it only makes sense to re-enable compilation if we have actually freed memory.
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   527
  // Note that typically several kB are released for sweeping 16MB of the code
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   528
  // cache. As a result, 'freed_memory' > 0 to restart the compiler.
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   529
  if (!CompileBroker::should_compile_new_jobs() && (freed_memory > 0)) {
17132
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   530
    CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
46269
7e725659ea12 8172286: CodeCacheFlushing message should be shown in UL
ysuenaga
parents: 42650
diff changeset
   531
    log.debug("restart compiler");
17132
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   532
    log_sweep("restart_compiler");
dffd513b2a8c 8012547: Code cache flushing can get stuck reclaming of memory
neliasso
parents: 13728
diff changeset
   533
  }
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   534
}
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   535
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   536
/**
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   537
 * This function updates the sweeper statistics that keep track of nmethods
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   538
 * state changes. If there is 'enough' state change, the sweeper is invoked
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   539
 * as soon as possible. There can be data races on _bytes_changed. The data
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   540
 * races are benign, since it does not matter if we loose a couple of bytes.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   541
 * In the worst case we call the sweeper a little later. Also, we are guaranteed
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   542
 * to invoke the sweeper if the code cache gets full.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   543
 */
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   544
void NMethodSweeper::report_state_change(nmethod* nm) {
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   545
  _bytes_changed += nm->total_size();
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   546
  possibly_enable_sweeper();
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   547
}
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   548
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   549
/**
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   550
 * Function determines if there was 'enough' state change in the code cache to invoke
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   551
 * the sweeper again. Currently, we determine 'enough' as more than 1% state change in
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   552
 * the code cache since the last sweep.
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   553
 */
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   554
void NMethodSweeper::possibly_enable_sweeper() {
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   555
  double percent_changed = ((double)_bytes_changed / (double)ReservedCodeCacheSize) * 100;
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   556
  if (percent_changed > 1.0) {
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   557
    _should_sweep = true;
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   558
  }
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   559
}
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   560
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   561
class CompiledMethodMarker: public StackObj {
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   562
 private:
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   563
  CodeCacheSweeperThread* _thread;
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   564
 public:
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   565
  CompiledMethodMarker(CompiledMethod* cm) {
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   566
    JavaThread* current = JavaThread::current();
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 27017
diff changeset
   567
    assert (current->is_Code_cache_sweeper_thread(), "Must be");
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   568
    _thread = (CodeCacheSweeperThread*)current;
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   569
    if (!cm->is_zombie() && !cm->is_unloaded()) {
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   570
      // Only expose live nmethods for scanning
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   571
      _thread->set_scanned_compiled_method(cm);
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   572
    }
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   573
  }
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   574
  ~CompiledMethodMarker() {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   575
    _thread->set_scanned_compiled_method(NULL);
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   576
  }
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   577
};
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   578
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   579
void NMethodSweeper::release_compiled_method(CompiledMethod* nm) {
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   580
  // Make sure the released nmethod is no longer referenced by the sweeper thread
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   581
  CodeCacheSweeperThread* thread = (CodeCacheSweeperThread*)JavaThread::current();
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   582
  thread->set_scanned_compiled_method(NULL);
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   583
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   584
  // Clean up any CompiledICHolders
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   585
  {
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   586
    ResourceMark rm;
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   587
    MutexLocker ml_patch(CompiledIC_lock);
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   588
    RelocIterator iter(nm);
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   589
    while (iter.next()) {
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   590
      if (iter.type() == relocInfo::virtual_call_type) {
42650
1f304d0c888b 8171008: Integrate AOT compiler into JDK
kvn
parents: 40664
diff changeset
   591
        CompiledIC::cleanup_call_site(iter.virtual_call_reloc(), nm);
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   592
      }
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   593
    }
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   594
  }
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   595
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   596
  MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   597
  nm->flush();
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   598
}
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   599
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   600
NMethodSweeper::MethodStateChange NMethodSweeper::process_compiled_method(CompiledMethod* cm) {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   601
  assert(cm != NULL, "sanity");
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   602
  assert(!CodeCache_lock->owned_by_self(), "just checking");
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   603
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   604
  MethodStateChange result = None;
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   605
  // Make sure this nmethod doesn't get unloaded during the scan,
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   606
  // since safepoints may happen during acquired below locks.
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   607
  CompiledMethodMarker nmm(cm);
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   608
  SWEEP(cm);
9942
2e86734ba620 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents: 9138
diff changeset
   609
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   610
  // Skip methods that are currently referenced by the VM
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   611
  if (cm->is_locked_by_vm()) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   612
    // But still remember to clean-up inline caches for alive nmethods
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   613
    if (cm->is_alive()) {
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   614
      // Clean inline caches that point to zombie/non-entrant/unloaded nmethods
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   615
      MutexLocker cl(CompiledIC_lock);
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   616
      cm->cleanup_inline_caches();
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   617
      SWEEP(cm);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   618
    }
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   619
    return result;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   620
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   621
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   622
  if (cm->is_zombie()) {
36818
b40330c06dea 8136458: Remove "marked for reclamation" nmethod state
thartmann
parents: 36802
diff changeset
   623
    // All inline caches that referred to this nmethod were cleaned in the
b40330c06dea 8136458: Remove "marked for reclamation" nmethod state
thartmann
parents: 36802
diff changeset
   624
    // previous sweeper cycle. Now flush the nmethod from the code cache.
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   625
    assert(!cm->is_locked_by_vm(), "must not flush locked Compiled Methods");
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   626
    release_compiled_method(cm);
36818
b40330c06dea 8136458: Remove "marked for reclamation" nmethod state
thartmann
parents: 36802
diff changeset
   627
    assert(result == None, "sanity");
b40330c06dea 8136458: Remove "marked for reclamation" nmethod state
thartmann
parents: 36802
diff changeset
   628
    result = Flushed;
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   629
  } else if (cm->is_not_entrant()) {
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   630
    // If there are no current activations of this method on the
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   631
    // stack we can safely convert it to a zombie method
47099
49f5fa3fc2ae 8186837: Memory ordering nmethod, _state and _stack_traversal_mark
rehn
parents: 46702
diff changeset
   632
    OrderAccess::loadload(); // _stack_traversal_mark and _state
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   633
    if (cm->can_convert_to_zombie()) {
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   634
      // Clear ICStubs to prevent back patching stubs of zombie or flushed
26912
19021f626ad2 8058737: CodeCache::find_blob fails with 'unsafe access to zombie method'
thartmann
parents: 26799
diff changeset
   635
      // nmethods during the next safepoint (see ICStub::finalize).
27017
bae5d661dd4b 8059735: make_not_entrant_or_zombie sees zombies
thartmann
parents: 26912
diff changeset
   636
      {
bae5d661dd4b 8059735: make_not_entrant_or_zombie sees zombies
thartmann
parents: 26912
diff changeset
   637
        MutexLocker cl(CompiledIC_lock);
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   638
        cm->clear_ic_stubs();
27017
bae5d661dd4b 8059735: make_not_entrant_or_zombie sees zombies
thartmann
parents: 26912
diff changeset
   639
      }
32401
cc58aeaec340 8075805: Crash while trying to release CompiledICHolder
thartmann
parents: 31348
diff changeset
   640
      // Code cache state change is tracked in make_zombie()
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   641
      cm->make_zombie();
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   642
      SWEEP(cm);
36816
987a22271911 8152861: VM crash on assert: locked methods shouldn't be flushed
thartmann
parents: 36802
diff changeset
   643
      // The nmethod may have been locked by JVMTI after being made zombie (see
987a22271911 8152861: VM crash on assert: locked methods shouldn't be flushed
thartmann
parents: 36802
diff changeset
   644
      // JvmtiDeferredEvent::compiled_method_unload_event()). If so, we cannot
987a22271911 8152861: VM crash on assert: locked methods shouldn't be flushed
thartmann
parents: 36802
diff changeset
   645
      // flush the osr nmethod directly but have to wait for a later sweeper cycle.
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   646
      if (cm->is_osr_method() && !cm->is_locked_by_vm()) {
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   647
        // No inline caches will ever point to osr methods, so we can just remove it.
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   648
        // Make sure that we unregistered the nmethod with the heap and flushed all
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   649
        // dependencies before removing the nmethod (done in make_zombie()).
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   650
        assert(cm->is_zombie(), "nmethod must be unregistered");
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   651
        release_compiled_method(cm);
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   652
        assert(result == None, "sanity");
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   653
        result = Flushed;
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   654
      } else {
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   655
        assert(result == None, "sanity");
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   656
        result = MadeZombie;
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   657
        assert(cm->is_zombie(), "nmethod must be zombie");
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   658
      }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   659
    } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   660
      // Still alive, clean up its inline caches
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   661
      MutexLocker cl(CompiledIC_lock);
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   662
      cm->cleanup_inline_caches();
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   663
      SWEEP(cm);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   664
    }
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   665
  } else if (cm->is_unloaded()) {
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   666
    // Code is unloaded, so there are no activations on the stack.
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   667
    // Convert the nmethod to zombie or flush it directly in the OSR case.
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   668
    {
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   669
      // Clean ICs of unloaded nmethods as well because they may reference other
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   670
      // unloaded nmethods that may be flushed earlier in the sweeper cycle.
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   671
      MutexLocker cl(CompiledIC_lock);
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   672
      cm->cleanup_inline_caches();
20290
2127dc70bce9 8020151: PSR:PERF Large performance regressions when code cache is filled
anoll
parents: 20019
diff changeset
   673
    }
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   674
    if (cm->is_osr_method()) {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   675
      SWEEP(cm);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   676
      // No inline caches will ever point to osr methods, so we can just remove it
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   677
      release_compiled_method(cm);
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   678
      assert(result == None, "sanity");
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   679
      result = Flushed;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   680
    } else {
21575
6a9645992cee 8027593: performance drop with constrained codecache starting with hs25 b111
anoll
parents: 20290
diff changeset
   681
      // Code cache state change is tracked in make_zombie()
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   682
      cm->make_zombie();
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   683
      SWEEP(cm);
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   684
      assert(result == None, "sanity");
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   685
      result = MadeZombie;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   686
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   687
  } else {
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   688
    if (cm->is_nmethod()) {
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   689
      possibly_flush((nmethod*)cm);
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   690
    }
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   691
    // Clean inline caches that point to zombie/non-entrant/unloaded nmethods
5533
e8d9ff82ec62 6950075: nmethod sweeper should operate concurrently
never
parents: 4750
diff changeset
   692
    MutexLocker cl(CompiledIC_lock);
38133
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   693
    cm->cleanup_inline_caches();
78b95467b9f1 8151956: Support non-continuous CodeBlobs in HotSpot
rbackman
parents: 36844
diff changeset
   694
    SWEEP(cm);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   695
  }
27917
c5937f7b4e8b 8064669: compiler/whitebox/AllocationCodeBlobTest.java crashes / asserts
iignatyev
parents: 27420
diff changeset
   696
  return result;
4750
71fd601907dc 4360113: Evict nmethods when code cache gets full
kvn
parents: 3919
diff changeset
   697
}
71fd601907dc 4360113: Evict nmethods when code cache gets full
kvn
parents: 3919
diff changeset
   698
24442
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   699
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   700
void NMethodSweeper::possibly_flush(nmethod* nm) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   701
  if (UseCodeCacheFlushing) {
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   702
    if (!nm->is_locked_by_vm() && !nm->is_native_method()) {
24442
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   703
      bool make_not_entrant = false;
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   704
36802
18b1db5a7e70 8023191: OSR nmethods should be flushed to free space in CodeCache
thartmann
parents: 34158
diff changeset
   705
      // Do not make native methods not-entrant
24442
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   706
      nm->dec_hotness_counter();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   707
      // Get the initial value of the hotness counter. This value depends on the
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   708
      // ReservedCodeCacheSize
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   709
      int reset_val = hotness_counter_reset_val();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   710
      int time_since_reset = reset_val - nm->hotness_counter();
31348
c28f02c7abb5 8077279: assert(ic->is_clean()) failed: IC should be clean
sjohanss
parents: 30205
diff changeset
   711
      int code_blob_type = CodeCache::get_code_blob_type(nm);
26796
666464578742 8015774: Add support for multiple code heaps
thartmann
parents: 26578
diff changeset
   712
      double threshold = -reset_val + (CodeCache::reverse_free_ratio(code_blob_type) * NmethodSweepActivity);
24442
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   713
      // The less free space in the code cache we have - the bigger reverse_free_ratio() is.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   714
      // I.e., 'threshold' increases with lower available space in the code cache and a higher
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   715
      // NmethodSweepActivity. If the current hotness counter - which decreases from its initial
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   716
      // value until it is reset by stack walking - is smaller than the computed threshold, the
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   717
      // corresponding nmethod is considered for removal.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   718
      if ((NmethodSweepActivity > 0) && (nm->hotness_counter() < threshold) && (time_since_reset > MinPassesBeforeFlush)) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   719
        // A method is marked as not-entrant if the method is
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   720
        // 1) 'old enough': nm->hotness_counter() < threshold
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   721
        // 2) The method was in_use for a minimum amount of time: (time_since_reset > MinPassesBeforeFlush)
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   722
        //    The second condition is necessary if we are dealing with very small code cache
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   723
        //    sizes (e.g., <10m) and the code cache size is too small to hold all hot methods.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   724
        //    The second condition ensures that methods are not immediately made not-entrant
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   725
        //    after compilation.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   726
        make_not_entrant = true;
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   727
      }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   728
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   729
      // The stack-scanning low-cost detection may not see the method was used (which can happen for
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   730
      // flat profiles). Check the age counter for possible data.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   731
      if (UseCodeAging && make_not_entrant && (nm->is_compiled_by_c2() || nm->is_compiled_by_c1())) {
26799
0c349e16bbe8 8058564: Tiered compilation performance drop in PIT
iveresov
parents: 26796
diff changeset
   732
        MethodCounters* mc = nm->method()->get_method_counters(Thread::current());
24442
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   733
        if (mc != NULL) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   734
          // Snapshot the value as it's changed concurrently
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   735
          int age = mc->nmethod_age();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   736
          if (MethodCounters::is_nmethod_hot(age)) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   737
            // The method has gone through flushing, and it became relatively hot that it deopted
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   738
            // before we could take a look at it. Give it more time to appear in the stack traces,
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   739
            // proportional to the number of deopts.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   740
            MethodData* md = nm->method()->method_data();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   741
            if (md != NULL && time_since_reset > (int)(MinPassesBeforeFlush * (md->tenure_traps() + 1))) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   742
              // It's been long enough, we still haven't seen it on stack.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   743
              // Try to flush it, but enable counters the next time.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   744
              mc->reset_nmethod_age();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   745
            } else {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   746
              make_not_entrant = false;
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   747
            }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   748
          } else if (MethodCounters::is_nmethod_warm(age)) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   749
            // Method has counters enabled, and the method was used within
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   750
            // previous MinPassesBeforeFlush sweeps. Reset the counter. Stay in the existing
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   751
            // compiled state.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   752
            mc->reset_nmethod_age();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   753
            // delay the next check
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   754
            nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   755
            make_not_entrant = false;
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   756
          } else if (MethodCounters::is_nmethod_age_unset(age)) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   757
            // No counters were used before. Set the counters to the detection
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   758
            // limit value. If the method is going to be used again it will be compiled
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   759
            // with counters that we're going to use for analysis the the next time.
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   760
            mc->reset_nmethod_age();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   761
          } else {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   762
            // Method was totally idle for 10 sweeps
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   763
            // The counter already has the initial value, flush it and may be recompile
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   764
            // later with counters
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   765
          }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   766
        }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   767
      }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   768
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   769
      if (make_not_entrant) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   770
        nm->make_not_entrant();
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   771
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   772
        // Code cache state change is tracked in make_not_entrant()
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   773
        if (PrintMethodFlushing && Verbose) {
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   774
          tty->print_cr("### Nmethod %d/" PTR_FORMAT "made not-entrant: hotness counter %d/%d threshold %f",
33148
68fa8b6c4340 8042893: compiler: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents: 32466
diff changeset
   775
              nm->compile_id(), p2i(nm), nm->hotness_counter(), reset_val, threshold);
24442
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   776
        }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   777
      }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   778
    }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   779
  }
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   780
}
4d4ae31dea26 8032463: VirtualDispatch test timeout with DeoptimizeALot
iveresov
parents: 24424
diff changeset
   781
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   782
// Print out some state information about the current sweep and the
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   783
// state of the code cache if it's requested.
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   784
void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) {
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   785
  if (PrintMethodFlushing) {
29339
f0b1b7788a51 8073257: compiler/codecache/stress/RandomAllocationTest.java + fastdebug + -XX:+LogCompilation, "allocating without ResourceMark"
thartmann
parents: 28163
diff changeset
   786
    ResourceMark rm;
9138
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   787
    stringStream s;
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   788
    // Dump code cache state into a buffer before locking the tty,
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   789
    // because log_state() will use locks causing lock conflicts.
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   790
    CodeCache::log_state(&s);
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   791
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   792
    ttyLocker ttyl;
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   793
    tty->print("### sweeper: %s ", msg);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   794
    if (format != NULL) {
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   795
      va_list ap;
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   796
      va_start(ap, format);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   797
      tty->vprint(format, ap);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   798
      va_end(ap);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   799
    }
24424
2658d7834c6e 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 24351
diff changeset
   800
    tty->print_cr("%s", s.as_string());
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   801
  }
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   802
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   803
  if (LogCompilation && (xtty != NULL)) {
29339
f0b1b7788a51 8073257: compiler/codecache/stress/RandomAllocationTest.java + fastdebug + -XX:+LogCompilation, "allocating without ResourceMark"
thartmann
parents: 28163
diff changeset
   804
    ResourceMark rm;
9138
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   805
    stringStream s;
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   806
    // Dump code cache state into a buffer before locking the tty,
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   807
    // because log_state() will use locks causing lock conflicts.
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   808
    CodeCache::log_state(&s);
35e4b04eadf4 7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents: 8921
diff changeset
   809
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   810
    ttyLocker ttyl;
5926
a36f90d986b6 6968385: malformed xml in sweeper logging
never
parents: 5924
diff changeset
   811
    xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count());
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   812
    if (format != NULL) {
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   813
      va_list ap;
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   814
      va_start(ap, format);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   815
      xtty->vprint(format, ap);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   816
      va_end(ap);
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   817
    }
24424
2658d7834c6e 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 24351
diff changeset
   818
    xtty->print("%s", s.as_string());
5924
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   819
    xtty->stamp();
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   820
    xtty->end_elem();
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   821
  }
dc9d04930c82 6965184: possible races in make_not_entrant_or_zombie
never
parents: 5895
diff changeset
   822
}
22210
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   823
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   824
void NMethodSweeper::print() {
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   825
  ttyLocker ttyl;
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   826
  tty->print_cr("Code cache sweeper statistics:");
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   827
  tty->print_cr("  Total sweep time:                %1.0lfms", (double)_total_time_sweeping.value()/1000000);
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   828
  tty->print_cr("  Total number of full sweeps:     %ld", _total_nof_code_cache_sweeps);
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   829
  tty->print_cr("  Total number of flushed methods: %ld(%ld C2 methods)", _total_nof_methods_reclaimed,
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   830
                                                    _total_nof_c2_methods_reclaimed);
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   831
  tty->print_cr("  Total size of flushed methods:   " SIZE_FORMAT "kB", _total_flushed_size/K);
b0408ba029f6 8025277: Add -XX: flag to print code cache sweeper statistics
anoll
parents: 22208
diff changeset
   832
}