src/hotspot/share/runtime/biasedLocking.cpp
author dholmes
Sat, 23 Jun 2018 01:32:41 -0400
changeset 50735 2f2af62dfac7
parent 50113 caf115bb98ad
child 51959 db0c3952de52
permissions -rw-r--r--
8010319: Implementation of JEP 181: Nest-Based Access Control Reviewed-by: alanb, psandoz, mchung, coleenp, acorn, mcimadamore, forax, jlahoda, sspitsyn, abuckley Contributed-by: alex.buckley@oracle.com, maurizio.mimadamore@oracle.com, mandy.chung@oracle.com, tobias.hartmann@oracle.com, david.holmes@oracle.com, vladimir.x.ivanov@oracle.com, karen.kinnear@oracle.com, vladimir.kozlov@oracle.com, john.r.rose@oracle.com, daniel.smith@oracle.com, serguei.spitsyn@oracle.com, kumardotsrinivasan@gmail.com, boris.ulasevich@bell-sw.com
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
     1
/*
49722
a47d1e21b3f1 8199735: Mark word updates need to use Access API
rkennke
parents: 49658
diff changeset
     2
 * Copyright (c) 2005, 2018, 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: 3261
diff changeset
    19
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 3261
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: 3261
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: 5547
diff changeset
    25
#include "precompiled.hpp"
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
    26
#include "jfr/jfrEvents.hpp"
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
    27
#include "jfr/support/jfrThreadId.hpp"
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
    28
#include "logging/log.hpp"
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
    29
#include "memory/resourceArea.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    30
#include "oops/klass.inline.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    31
#include "oops/markOop.hpp"
29081
c61eb4914428 8072911: Remove includes of oop.inline.hpp from .hpp files
stefank
parents: 25351
diff changeset
    32
#include "oops/oop.inline.hpp"
40655
9f644073d3a0 8157907: Incorrect inclusion of atomic.hpp instead of atomic.inline.hpp
dholmes
parents: 37251
diff changeset
    33
#include "runtime/atomic.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    34
#include "runtime/basicLock.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    35
#include "runtime/biasedLocking.hpp"
49449
ef5d5d343e2a 8199263: Split interfaceSupport.hpp to not require including .inline.hpp files
coleenp
parents: 48105
diff changeset
    36
#include "runtime/handles.inline.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    37
#include "runtime/task.hpp"
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
    38
#include "runtime/threadSMR.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    39
#include "runtime/vframe.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    40
#include "runtime/vmThread.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    41
#include "runtime/vm_operations.hpp"
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
    42
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    43
489c9b5090e2 Initial load
duke
parents:
diff changeset
    44
static bool _biased_locking_enabled = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    45
BiasedLockingCounters BiasedLocking::_counters;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    46
489c9b5090e2 Initial load
duke
parents:
diff changeset
    47
static GrowableArray<Handle>*  _preserved_oop_stack  = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    48
static GrowableArray<markOop>* _preserved_mark_stack = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    49
46729
c62d2e8b2728 7133093: Improve system dictionary performance
coleenp
parents: 46678
diff changeset
    50
static void enable_biased_locking(InstanceKlass* k) {
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
    51
  k->set_prototype_header(markOopDesc::biased_locking_prototype());
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    52
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
    53
489c9b5090e2 Initial load
duke
parents:
diff changeset
    54
class VM_EnableBiasedLocking: public VM_Operation {
257
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
    55
 private:
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
    56
  bool _is_cheap_allocated;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    57
 public:
257
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
    58
  VM_EnableBiasedLocking(bool is_cheap_allocated) { _is_cheap_allocated = is_cheap_allocated; }
231
3cfeeae32993 6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
sbohne
parents: 1
diff changeset
    59
  VMOp_Type type() const          { return VMOp_EnableBiasedLocking; }
257
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
    60
  Mode evaluation_mode() const    { return _is_cheap_allocated ? _async_safepoint : _safepoint; }
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
    61
  bool is_cheap_allocated() const { return _is_cheap_allocated; }
231
3cfeeae32993 6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
sbohne
parents: 1
diff changeset
    62
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    63
  void doit() {
46729
c62d2e8b2728 7133093: Improve system dictionary performance
coleenp
parents: 46678
diff changeset
    64
    // Iterate the class loader data dictionaries enabling biased locking for all
c62d2e8b2728 7133093: Improve system dictionary performance
coleenp
parents: 46678
diff changeset
    65
    // currently loaded classes.
c62d2e8b2728 7133093: Improve system dictionary performance
coleenp
parents: 46678
diff changeset
    66
    ClassLoaderDataGraph::dictionary_classes_do(enable_biased_locking);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    67
    // Indicate that future instances should enable it as well
489c9b5090e2 Initial load
duke
parents:
diff changeset
    68
    _biased_locking_enabled = true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    69
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
    70
    log_info(biasedlocking)("Biased locking enabled");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    71
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    72
489c9b5090e2 Initial load
duke
parents:
diff changeset
    73
  bool allow_nested_vm_operations() const        { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    74
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
    75
489c9b5090e2 Initial load
duke
parents:
diff changeset
    76
489c9b5090e2 Initial load
duke
parents:
diff changeset
    77
// One-shot PeriodicTask subclass for enabling biased locking
489c9b5090e2 Initial load
duke
parents:
diff changeset
    78
class EnableBiasedLockingTask : public PeriodicTask {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    79
 public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
    80
  EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
    81
489c9b5090e2 Initial load
duke
parents:
diff changeset
    82
  virtual void task() {
231
3cfeeae32993 6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
sbohne
parents: 1
diff changeset
    83
    // Use async VM operation to avoid blocking the Watcher thread.
3cfeeae32993 6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
sbohne
parents: 1
diff changeset
    84
    // VM Thread will free C heap storage.
257
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
    85
    VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking(true);
231
3cfeeae32993 6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
sbohne
parents: 1
diff changeset
    86
    VMThread::execute(op);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    87
489c9b5090e2 Initial load
duke
parents:
diff changeset
    88
    // Reclaim our storage and disenroll ourself
489c9b5090e2 Initial load
duke
parents:
diff changeset
    89
    delete this;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    90
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    91
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
    92
489c9b5090e2 Initial load
duke
parents:
diff changeset
    93
489c9b5090e2 Initial load
duke
parents:
diff changeset
    94
void BiasedLocking::init() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    95
  // If biased locking is enabled, schedule a task to fire a few
489c9b5090e2 Initial load
duke
parents:
diff changeset
    96
  // seconds into the run which turns on biased locking for all
489c9b5090e2 Initial load
duke
parents:
diff changeset
    97
  // currently loaded classes as well as future ones. This is a
489c9b5090e2 Initial load
duke
parents:
diff changeset
    98
  // workaround for startup time regressions due to a large number of
489c9b5090e2 Initial load
duke
parents:
diff changeset
    99
  // safepoints being taken during VM startup for bias revocation.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   100
  // Ideally we would have a lower cost for individual bias revocation
489c9b5090e2 Initial load
duke
parents:
diff changeset
   101
  // and not need a mechanism like this.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   102
  if (UseBiasedLocking) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   103
    if (BiasedLockingStartupDelay > 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   104
      EnableBiasedLockingTask* task = new EnableBiasedLockingTask(BiasedLockingStartupDelay);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   105
      task->enroll();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   106
    } else {
257
229330365385 6692235: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
sbohne
parents: 231
diff changeset
   107
      VM_EnableBiasedLocking op(false);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   108
      VMThread::execute(&op);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   109
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   110
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   111
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   112
489c9b5090e2 Initial load
duke
parents:
diff changeset
   113
489c9b5090e2 Initial load
duke
parents:
diff changeset
   114
bool BiasedLocking::enabled() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   115
  return _biased_locking_enabled;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   116
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   117
489c9b5090e2 Initial load
duke
parents:
diff changeset
   118
// Returns MonitorInfos for all objects locked on this thread in youngest to oldest order
489c9b5090e2 Initial load
duke
parents:
diff changeset
   119
static GrowableArray<MonitorInfo*>* get_or_compute_monitor_info(JavaThread* thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   120
  GrowableArray<MonitorInfo*>* info = thread->cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   121
  if (info != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   122
    return info;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   123
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   124
489c9b5090e2 Initial load
duke
parents:
diff changeset
   125
  info = new GrowableArray<MonitorInfo*>();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   126
489c9b5090e2 Initial load
duke
parents:
diff changeset
   127
  // It's possible for the thread to not have any Java frames on it,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   128
  // i.e., if it's the main thread and it's already returned from main()
489c9b5090e2 Initial load
duke
parents:
diff changeset
   129
  if (thread->has_last_Java_frame()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   130
    RegisterMap rm(thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   131
    for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   132
      GrowableArray<MonitorInfo*> *monitors = vf->monitors();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   133
      if (monitors != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   134
        int len = monitors->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   135
        // Walk monitors youngest to oldest
489c9b5090e2 Initial load
duke
parents:
diff changeset
   136
        for (int i = len - 1; i >= 0; i--) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   137
          MonitorInfo* mon_info = monitors->at(i);
22926
1a4328d3fd0e 8032011: nsk/stress/jck60/jck60022 crashes in src\share\vm\runtime\synchronizer.cpp:239
roland
parents: 22859
diff changeset
   138
          if (mon_info->eliminated()) continue;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   139
          oop owner = mon_info->owner();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   140
          if (owner != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   141
            info->append(mon_info);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   142
          }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   143
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   144
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   145
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   146
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   147
489c9b5090e2 Initial load
duke
parents:
diff changeset
   148
  thread->set_cached_monitor_info(info);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   149
  return info;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   150
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   151
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   152
// After the call, *biased_locker will be set to obj->mark()->biased_locker() if biased_locker != NULL,
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   153
// AND it is a living thread. Otherwise it will not be updated, (i.e. the caller is responsible for initialization).
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   154
static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_bulk, JavaThread* requesting_thread, JavaThread** biased_locker) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   155
  markOop mark = obj->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   156
  if (!mark->has_bias_pattern()) {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   157
    if (log_is_enabled(Info, biasedlocking)) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   158
      ResourceMark rm;
37251
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   159
      log_info(biasedlocking)("  (Skipping revocation of object " INTPTR_FORMAT
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   160
                              ", mark " INTPTR_FORMAT ", type %s"
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   161
                              ", requesting thread " INTPTR_FORMAT
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   162
                              " because it's no longer biased)",
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   163
                              p2i((void *)obj), (intptr_t) mark,
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   164
                              obj->klass()->external_name(),
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   165
                              (intptr_t) requesting_thread);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   166
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   167
    return BiasedLocking::NOT_BIASED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   168
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   169
13925
37f75ba502b1 8000351: Tenuring threshold should be unsigned
jwilhelm
parents: 13728
diff changeset
   170
  uint age = mark->age();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   171
  markOop   biased_prototype = markOopDesc::biased_locking_prototype()->set_age(age);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   172
  markOop unbiased_prototype = markOopDesc::prototype()->set_age(age);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   173
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   174
  // Log at "info" level if not bulk, else "trace" level
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   175
  if (!is_bulk) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   176
    ResourceMark rm;
37251
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   177
    log_info(biasedlocking)("Revoking bias of object " INTPTR_FORMAT ", mark "
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   178
                            INTPTR_FORMAT ", type %s, prototype header " INTPTR_FORMAT
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   179
                            ", allow rebias %d, requesting thread " INTPTR_FORMAT,
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   180
                            p2i((void *)obj),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   181
                            (intptr_t) mark,
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   182
                            obj->klass()->external_name(),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   183
                            (intptr_t) obj->klass()->prototype_header(),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   184
                            (allow_rebias ? 1 : 0),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   185
                            (intptr_t) requesting_thread);
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   186
  } else {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   187
    ResourceMark rm;
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   188
    log_trace(biasedlocking)("Revoking bias of object " INTPTR_FORMAT " , mark "
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   189
                             INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   190
                             " , allow rebias %d , requesting thread " INTPTR_FORMAT,
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   191
                             p2i((void *)obj),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   192
                             (intptr_t) mark,
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   193
                             obj->klass()->external_name(),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   194
                             (intptr_t) obj->klass()->prototype_header(),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   195
                             (allow_rebias ? 1 : 0),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   196
                             (intptr_t) requesting_thread);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   197
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   198
489c9b5090e2 Initial load
duke
parents:
diff changeset
   199
  JavaThread* biased_thread = mark->biased_locker();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   200
  if (biased_thread == NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   201
    // Object is anonymously biased. We can get here if, for
489c9b5090e2 Initial load
duke
parents:
diff changeset
   202
    // example, we revoke the bias due to an identity hash code
489c9b5090e2 Initial load
duke
parents:
diff changeset
   203
    // being computed for an object.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   204
    if (!allow_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   205
      obj->set_mark(unbiased_prototype);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   206
    }
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   207
    // Log at "info" level if not bulk, else "trace" level
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   208
    if (!is_bulk) {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   209
      log_info(biasedlocking)("  Revoked bias of anonymously-biased object");
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   210
    } else {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   211
      log_trace(biasedlocking)("  Revoked bias of anonymously-biased object");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   212
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   213
    return BiasedLocking::BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   214
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   215
489c9b5090e2 Initial load
duke
parents:
diff changeset
   216
  // Handle case where the thread toward which the object was biased has exited
489c9b5090e2 Initial load
duke
parents:
diff changeset
   217
  bool thread_is_alive = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   218
  if (requesting_thread == biased_thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   219
    thread_is_alive = true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   220
  } else {
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   221
    ThreadsListHandle tlh;
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   222
    thread_is_alive = tlh.includes(biased_thread);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   223
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   224
  if (!thread_is_alive) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   225
    if (allow_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   226
      obj->set_mark(biased_prototype);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   227
    } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   228
      obj->set_mark(unbiased_prototype);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   229
    }
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   230
    // Log at "info" level if not bulk, else "trace" level
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   231
    if (!is_bulk) {
37251
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   232
      log_info(biasedlocking)("  Revoked bias of object biased toward dead thread ("
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   233
                              PTR_FORMAT ")", p2i(biased_thread));
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   234
    } else {
37251
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   235
      log_trace(biasedlocking)("  Revoked bias of object biased toward dead thread ("
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   236
                               PTR_FORMAT ")", p2i(biased_thread));
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   237
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   238
    return BiasedLocking::BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   239
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   240
37251
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   241
  // Log at "info" level if not bulk, else "trace" level
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   242
  if (!is_bulk) {
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   243
    log_info(biasedlocking)("  Revoked bias of object biased toward live thread ("
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   244
                            PTR_FORMAT ")", p2i(biased_thread));
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   245
  } else {
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   246
    log_trace(biasedlocking)("  Revoked bias of object biased toward live thread ("
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   247
                               PTR_FORMAT ")", p2i(biased_thread));
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   248
  }
9fc139ad74b5 8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents: 36186
diff changeset
   249
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   250
  // Thread owning bias is alive.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   251
  // Check to see whether it currently owns the lock and, if so,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   252
  // write down the needed displaced headers to the thread's stack.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   253
  // Otherwise, restore the object's header either to the unlocked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   254
  // or unbiased state.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   255
  GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(biased_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   256
  BasicLock* highest_lock = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   257
  for (int i = 0; i < cached_monitor_info->length(); i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   258
    MonitorInfo* mon_info = cached_monitor_info->at(i);
49658
8237a91c1cca 8199781: Don't use naked == for comparing oops
rkennke
parents: 49449
diff changeset
   259
    if (oopDesc::equals(mon_info->owner(), obj)) {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   260
      log_trace(biasedlocking)("   mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")",
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   261
                               p2i((void *) mon_info->owner()),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   262
                               p2i((void *) obj));
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   263
      // Assume recursive case and fix up highest lock later
489c9b5090e2 Initial load
duke
parents:
diff changeset
   264
      markOop mark = markOopDesc::encode((BasicLock*) NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   265
      highest_lock = mon_info->lock();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   266
      highest_lock->set_displaced_header(mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   267
    } else {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   268
      log_trace(biasedlocking)("   mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")",
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   269
                               p2i((void *) mon_info->owner()),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   270
                               p2i((void *) obj));
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   271
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   272
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   273
  if (highest_lock != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   274
    // Fix up highest lock to contain displaced header and point
489c9b5090e2 Initial load
duke
parents:
diff changeset
   275
    // object at it
489c9b5090e2 Initial load
duke
parents:
diff changeset
   276
    highest_lock->set_displaced_header(unbiased_prototype);
22859
7b88983393b7 8029396: PPC64 (part 212): Several memory ordering fixes in C-code.
goetz
parents: 20282
diff changeset
   277
    // Reset object header to point to displaced mark.
7b88983393b7 8029396: PPC64 (part 212): Several memory ordering fixes in C-code.
goetz
parents: 20282
diff changeset
   278
    // Must release storing the lock address for platforms without TSO
7b88983393b7 8029396: PPC64 (part 212): Several memory ordering fixes in C-code.
goetz
parents: 20282
diff changeset
   279
    // ordering (e.g. ppc).
7b88983393b7 8029396: PPC64 (part 212): Several memory ordering fixes in C-code.
goetz
parents: 20282
diff changeset
   280
    obj->release_set_mark(markOopDesc::encode(highest_lock));
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   281
    assert(!obj->mark()->has_bias_pattern(), "illegal mark state: stack lock used bias bit");
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   282
    // Log at "info" level if not bulk, else "trace" level
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   283
    if (!is_bulk) {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   284
      log_info(biasedlocking)("  Revoked bias of currently-locked object");
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   285
    } else {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   286
      log_trace(biasedlocking)("  Revoked bias of currently-locked object");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   287
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   288
  } else {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   289
    // Log at "info" level if not bulk, else "trace" level
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   290
    if (!is_bulk) {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   291
      log_info(biasedlocking)("  Revoked bias of currently-unlocked object");
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   292
    } else {
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   293
      log_trace(biasedlocking)("  Revoked bias of currently-unlocked object");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   294
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   295
    if (allow_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   296
      obj->set_mark(biased_prototype);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   297
    } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   298
      // Store the unlocked value into the object's header.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   299
      obj->set_mark(unbiased_prototype);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   300
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   301
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   302
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   303
  // If requested, return information on which thread held the bias
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   304
  if (biased_locker != NULL) {
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   305
    *biased_locker = biased_thread;
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   306
  }
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   307
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   308
  return BiasedLocking::BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   309
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   310
489c9b5090e2 Initial load
duke
parents:
diff changeset
   311
489c9b5090e2 Initial load
duke
parents:
diff changeset
   312
enum HeuristicsResult {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   313
  HR_NOT_BIASED    = 1,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   314
  HR_SINGLE_REVOKE = 2,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   315
  HR_BULK_REBIAS   = 3,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   316
  HR_BULK_REVOKE   = 4
489c9b5090e2 Initial load
duke
parents:
diff changeset
   317
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   318
489c9b5090e2 Initial load
duke
parents:
diff changeset
   319
489c9b5090e2 Initial load
duke
parents:
diff changeset
   320
static HeuristicsResult update_heuristics(oop o, bool allow_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   321
  markOop mark = o->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   322
  if (!mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   323
    return HR_NOT_BIASED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   324
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   325
489c9b5090e2 Initial load
duke
parents:
diff changeset
   326
  // Heuristics to attempt to throttle the number of revocations.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   327
  // Stages:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   328
  // 1. Revoke the biases of all objects in the heap of this type,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   329
  //    but allow rebiasing of those objects if unlocked.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   330
  // 2. Revoke the biases of all objects in the heap of this type
489c9b5090e2 Initial load
duke
parents:
diff changeset
   331
  //    and don't allow rebiasing of these objects. Disable
489c9b5090e2 Initial load
duke
parents:
diff changeset
   332
  //    allocation of objects of that type with the bias bit set.
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   333
  Klass* k = o->klass();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   334
  jlong cur_time = os::javaTimeMillis();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   335
  jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   336
  int revocation_count = k->biased_lock_revocation_count();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   337
  if ((revocation_count >= BiasedLockingBulkRebiasThreshold) &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   338
      (revocation_count <  BiasedLockingBulkRevokeThreshold) &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   339
      (last_bulk_revocation_time != 0) &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   340
      (cur_time - last_bulk_revocation_time >= BiasedLockingDecayTime)) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   341
    // This is the first revocation we've seen in a while of an
489c9b5090e2 Initial load
duke
parents:
diff changeset
   342
    // object of this type since the last time we performed a bulk
489c9b5090e2 Initial load
duke
parents:
diff changeset
   343
    // rebiasing operation. The application is allocating objects in
489c9b5090e2 Initial load
duke
parents:
diff changeset
   344
    // bulk which are biased toward a thread and then handing them
489c9b5090e2 Initial load
duke
parents:
diff changeset
   345
    // off to another thread. We can cope with this allocation
489c9b5090e2 Initial load
duke
parents:
diff changeset
   346
    // pattern via the bulk rebiasing mechanism so we reset the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   347
    // klass's revocation count rather than allow it to increase
489c9b5090e2 Initial load
duke
parents:
diff changeset
   348
    // monotonically. If we see the need to perform another bulk
489c9b5090e2 Initial load
duke
parents:
diff changeset
   349
    // rebias operation later, we will, and if subsequently we see
489c9b5090e2 Initial load
duke
parents:
diff changeset
   350
    // many more revocation operations in a short period of time we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   351
    // will completely disable biasing for this type.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   352
    k->set_biased_lock_revocation_count(0);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   353
    revocation_count = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   354
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   355
489c9b5090e2 Initial load
duke
parents:
diff changeset
   356
  // Make revocation count saturate just beyond BiasedLockingBulkRevokeThreshold
489c9b5090e2 Initial load
duke
parents:
diff changeset
   357
  if (revocation_count <= BiasedLockingBulkRevokeThreshold) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   358
    revocation_count = k->atomic_incr_biased_lock_revocation_count();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   359
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   360
489c9b5090e2 Initial load
duke
parents:
diff changeset
   361
  if (revocation_count == BiasedLockingBulkRevokeThreshold) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   362
    return HR_BULK_REVOKE;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   363
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   364
489c9b5090e2 Initial load
duke
parents:
diff changeset
   365
  if (revocation_count == BiasedLockingBulkRebiasThreshold) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   366
    return HR_BULK_REBIAS;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   367
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   368
489c9b5090e2 Initial load
duke
parents:
diff changeset
   369
  return HR_SINGLE_REVOKE;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   370
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   371
489c9b5090e2 Initial load
duke
parents:
diff changeset
   372
489c9b5090e2 Initial load
duke
parents:
diff changeset
   373
static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   374
                                                                   bool bulk_rebias,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   375
                                                                   bool attempt_rebias_of_object,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   376
                                                                   JavaThread* requesting_thread) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   377
  assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   378
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   379
  log_info(biasedlocking)("* Beginning bulk revocation (kind == %s) because of object "
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   380
                          INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s",
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   381
                          (bulk_rebias ? "rebias" : "revoke"),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   382
                          p2i((void *) o),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   383
                          (intptr_t) o->mark(),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   384
                          o->klass()->external_name());
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   385
489c9b5090e2 Initial load
duke
parents:
diff changeset
   386
  jlong cur_time = os::javaTimeMillis();
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   387
  o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   388
489c9b5090e2 Initial load
duke
parents:
diff changeset
   389
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13195
diff changeset
   390
  Klass* k_o = o->klass();
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
   391
  Klass* klass = k_o;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   392
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   393
  {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   394
    JavaThreadIteratorWithHandle jtiwh;
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   395
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   396
    if (bulk_rebias) {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   397
      // Use the epoch in the klass of the object to implicitly revoke
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   398
      // all biases of objects of this data type and force them to be
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   399
      // reacquired. However, we also need to walk the stacks of all
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   400
      // threads and update the headers of lightweight locked objects
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   401
      // with biases to have the current epoch.
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   402
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   403
      // If the prototype header doesn't have the bias pattern, don't
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   404
      // try to update the epoch -- assume another VM operation came in
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   405
      // and reset the header to the unbiased state, which will
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   406
      // implicitly cause all existing biases to be revoked
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   407
      if (klass->prototype_header()->has_bias_pattern()) {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   408
        int prev_epoch = klass->prototype_header()->bias_epoch();
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   409
        klass->set_prototype_header(klass->prototype_header()->incr_bias_epoch());
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   410
        int cur_epoch = klass->prototype_header()->bias_epoch();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   411
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   412
        // Now walk all threads' stacks and adjust epochs of any biased
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   413
        // and locked objects of this data type we encounter
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   414
        for (; JavaThread *thr = jtiwh.next(); ) {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   415
          GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr);
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   416
          for (int i = 0; i < cached_monitor_info->length(); i++) {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   417
            MonitorInfo* mon_info = cached_monitor_info->at(i);
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   418
            oop owner = mon_info->owner();
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   419
            markOop mark = owner->mark();
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   420
            if ((owner->klass() == k_o) && mark->has_bias_pattern()) {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   421
              // We might have encountered this object already in the case of recursive locking
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   422
              assert(mark->bias_epoch() == prev_epoch || mark->bias_epoch() == cur_epoch, "error in bias epoch adjustment");
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   423
              owner->set_mark(mark->set_bias_epoch(cur_epoch));
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   424
            }
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   425
          }
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   426
        }
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   427
      }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   428
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   429
      // At this point we're done. All we have to do is potentially
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   430
      // adjust the header of the given object to revoke its bias.
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   431
      revoke_bias(o, attempt_rebias_of_object && klass->prototype_header()->has_bias_pattern(), true, requesting_thread, NULL);
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   432
    } else {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   433
      if (log_is_enabled(Info, biasedlocking)) {
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   434
        ResourceMark rm;
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   435
        log_info(biasedlocking)("* Disabling biased locking for type %s", klass->external_name());
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   436
      }
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   437
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   438
      // Disable biased locking for this data type. Not only will this
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   439
      // cause future instances to not be biased, but existing biased
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   440
      // instances will notice that this implicitly caused their biases
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   441
      // to be revoked.
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   442
      klass->set_prototype_header(markOopDesc::prototype());
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   443
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   444
      // Now walk all threads' stacks and forcibly revoke the biases of
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   445
      // any locked and biased objects of this data type we encounter.
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   446
      for (; JavaThread *thr = jtiwh.next(); ) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   447
        GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   448
        for (int i = 0; i < cached_monitor_info->length(); i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   449
          MonitorInfo* mon_info = cached_monitor_info->at(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   450
          oop owner = mon_info->owner();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   451
          markOop mark = owner->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   452
          if ((owner->klass() == k_o) && mark->has_bias_pattern()) {
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   453
            revoke_bias(owner, false, true, requesting_thread, NULL);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   454
          }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   455
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   456
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   457
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   458
      // Must force the bias of the passed object to be forcibly revoked
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   459
      // as well to ensure guarantees to callers
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   460
      revoke_bias(o, false, true, requesting_thread, NULL);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   461
    }
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   462
  } // ThreadsListHandle is destroyed here.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   463
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   464
  log_info(biasedlocking)("* Ending bulk revocation");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   465
489c9b5090e2 Initial load
duke
parents:
diff changeset
   466
  BiasedLocking::Condition status_code = BiasedLocking::BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   467
489c9b5090e2 Initial load
duke
parents:
diff changeset
   468
  if (attempt_rebias_of_object &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   469
      o->mark()->has_bias_pattern() &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   470
      klass->prototype_header()->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   471
    markOop new_mark = markOopDesc::encode(requesting_thread, o->mark()->age(),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   472
                                           klass->prototype_header()->bias_epoch());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   473
    o->set_mark(new_mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   474
    status_code = BiasedLocking::BIAS_REVOKED_AND_REBIASED;
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   475
    log_info(biasedlocking)("  Rebiased object toward thread " INTPTR_FORMAT, (intptr_t) requesting_thread);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   476
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   477
489c9b5090e2 Initial load
duke
parents:
diff changeset
   478
  assert(!o->mark()->has_bias_pattern() ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   479
         (attempt_rebias_of_object && (o->mark()->biased_locker() == requesting_thread)),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   480
         "bug in bulk bias revocation");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   481
489c9b5090e2 Initial load
duke
parents:
diff changeset
   482
  return status_code;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   483
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   484
489c9b5090e2 Initial load
duke
parents:
diff changeset
   485
489c9b5090e2 Initial load
duke
parents:
diff changeset
   486
static void clean_up_cached_monitor_info() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   487
  // Walk the thread list clearing out the cached monitors
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   488
  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thr = jtiwh.next(); ) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   489
    thr->set_cached_monitor_info(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   490
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   491
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   492
489c9b5090e2 Initial load
duke
parents:
diff changeset
   493
489c9b5090e2 Initial load
duke
parents:
diff changeset
   494
class VM_RevokeBias : public VM_Operation {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   495
protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   496
  Handle* _obj;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   497
  GrowableArray<Handle>* _objs;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   498
  JavaThread* _requesting_thread;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   499
  BiasedLocking::Condition _status_code;
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   500
  traceid _biased_locker_id;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   501
489c9b5090e2 Initial load
duke
parents:
diff changeset
   502
public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   503
  VM_RevokeBias(Handle* obj, JavaThread* requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   504
    : _obj(obj)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   505
    , _objs(NULL)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   506
    , _requesting_thread(requesting_thread)
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   507
    , _status_code(BiasedLocking::NOT_BIASED)
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   508
    , _biased_locker_id(0) {}
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   509
489c9b5090e2 Initial load
duke
parents:
diff changeset
   510
  VM_RevokeBias(GrowableArray<Handle>* objs, JavaThread* requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   511
    : _obj(NULL)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   512
    , _objs(objs)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   513
    , _requesting_thread(requesting_thread)
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   514
    , _status_code(BiasedLocking::NOT_BIASED)
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   515
    , _biased_locker_id(0) {}
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   516
489c9b5090e2 Initial load
duke
parents:
diff changeset
   517
  virtual VMOp_Type type() const { return VMOp_RevokeBias; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   518
489c9b5090e2 Initial load
duke
parents:
diff changeset
   519
  virtual bool doit_prologue() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   520
    // Verify that there is actual work to do since the callers just
489c9b5090e2 Initial load
duke
parents:
diff changeset
   521
    // give us locked object(s). If we don't find any biased objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   522
    // there is nothing to do and we avoid a safepoint.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   523
    if (_obj != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   524
      markOop mark = (*_obj)()->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   525
      if (mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   526
        return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   527
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   528
    } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   529
      for ( int i = 0 ; i < _objs->length(); i++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   530
        markOop mark = (_objs->at(i))()->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   531
        if (mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   532
          return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   533
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   534
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   535
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   536
    return false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   537
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   538
489c9b5090e2 Initial load
duke
parents:
diff changeset
   539
  virtual void doit() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   540
    if (_obj != NULL) {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   541
      log_info(biasedlocking)("Revoking bias with potentially per-thread safepoint:");
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   542
      JavaThread* biased_locker = NULL;
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   543
      _status_code = revoke_bias((*_obj)(), false, false, _requesting_thread, &biased_locker);
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   544
      if (biased_locker != NULL) {
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   545
        _biased_locker_id = JFR_THREAD_ID(biased_locker);
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   546
      }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   547
      clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   548
      return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   549
    } else {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   550
      log_info(biasedlocking)("Revoking bias with global safepoint:");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   551
      BiasedLocking::revoke_at_safepoint(_objs);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   552
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   553
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   554
489c9b5090e2 Initial load
duke
parents:
diff changeset
   555
  BiasedLocking::Condition status_code() const {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   556
    return _status_code;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   557
  }
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   558
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   559
  traceid biased_locker() const {
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   560
    return _biased_locker_id;
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   561
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   562
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   563
489c9b5090e2 Initial load
duke
parents:
diff changeset
   564
489c9b5090e2 Initial load
duke
parents:
diff changeset
   565
class VM_BulkRevokeBias : public VM_RevokeBias {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   566
private:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   567
  bool _bulk_rebias;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   568
  bool _attempt_rebias_of_object;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   569
489c9b5090e2 Initial load
duke
parents:
diff changeset
   570
public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   571
  VM_BulkRevokeBias(Handle* obj, JavaThread* requesting_thread,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   572
                    bool bulk_rebias,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   573
                    bool attempt_rebias_of_object)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   574
    : VM_RevokeBias(obj, requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   575
    , _bulk_rebias(bulk_rebias)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   576
    , _attempt_rebias_of_object(attempt_rebias_of_object) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   577
489c9b5090e2 Initial load
duke
parents:
diff changeset
   578
  virtual VMOp_Type type() const { return VMOp_BulkRevokeBias; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   579
  virtual bool doit_prologue()   { return true; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   580
489c9b5090e2 Initial load
duke
parents:
diff changeset
   581
  virtual void doit() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   582
    _status_code = bulk_revoke_or_rebias_at_safepoint((*_obj)(), _bulk_rebias, _attempt_rebias_of_object, _requesting_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   583
    clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   584
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   585
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   586
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   587
template <typename E>
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   588
static void set_safepoint_id(E* event) {
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   589
  assert(event != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   590
  // Subtract 1 to match the id of events committed inside the safepoint
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   591
  event->set_safepointId(SafepointSynchronize::safepoint_counter() - 1);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   592
}
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   593
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   594
static void post_self_revocation_event(EventBiasedLockSelfRevocation* event, Klass* k) {
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   595
  assert(event != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   596
  assert(k != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   597
  assert(event->should_commit(), "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   598
  event->set_lockClass(k);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   599
  event->commit();
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   600
}
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   601
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   602
static void post_revocation_event(EventBiasedLockRevocation* event, Klass* k, VM_RevokeBias* revoke) {
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   603
  assert(event != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   604
  assert(k != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   605
  assert(revoke != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   606
  assert(event->should_commit(), "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   607
  event->set_lockClass(k);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   608
  set_safepoint_id(event);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   609
  event->set_previousOwner(revoke->biased_locker());
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   610
  event->commit();
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   611
}
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   612
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   613
static void post_class_revocation_event(EventBiasedLockClassRevocation* event, Klass* k, bool disabled_bias) {
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   614
  assert(event != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   615
  assert(k != NULL, "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   616
  assert(event->should_commit(), "invariant");
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   617
  event->set_revokedClass(k);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   618
  event->set_disableBiasing(disabled_bias);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   619
  set_safepoint_id(event);
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   620
  event->commit();
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   621
}
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   622
489c9b5090e2 Initial load
duke
parents:
diff changeset
   623
BiasedLocking::Condition BiasedLocking::revoke_and_rebias(Handle obj, bool attempt_rebias, TRAPS) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   624
  assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   625
489c9b5090e2 Initial load
duke
parents:
diff changeset
   626
  // We can revoke the biases of anonymously-biased objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   627
  // efficiently enough that we should not cause these revocations to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   628
  // update the heuristics because doing so may cause unwanted bulk
489c9b5090e2 Initial load
duke
parents:
diff changeset
   629
  // revocations (which are expensive) to occur.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   630
  markOop mark = obj->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   631
  if (mark->is_biased_anonymously() && !attempt_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   632
    // We are probably trying to revoke the bias of this object due to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   633
    // an identity hash code computation. Try to revoke the bias
489c9b5090e2 Initial load
duke
parents:
diff changeset
   634
    // without a safepoint. This is possible if we can successfully
489c9b5090e2 Initial load
duke
parents:
diff changeset
   635
    // compare-and-exchange an unbiased header into the mark word of
489c9b5090e2 Initial load
duke
parents:
diff changeset
   636
    // the object, meaning that no other thread has raced to acquire
489c9b5090e2 Initial load
duke
parents:
diff changeset
   637
    // the bias of the object.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   638
    markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   639
    markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age());
46678
9b8b0fe92c93 8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents: 40655
diff changeset
   640
    markOop res_mark = obj->cas_set_mark(unbiased_prototype, mark);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   641
    if (res_mark == biased_value) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   642
      return BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   643
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   644
  } else if (mark->has_bias_pattern()) {
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
   645
    Klass* k = obj->klass();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   646
    markOop prototype_header = k->prototype_header();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   647
    if (!prototype_header->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   648
      // This object has a stale bias from before the bulk revocation
489c9b5090e2 Initial load
duke
parents:
diff changeset
   649
      // for this data type occurred. It's pointless to update the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   650
      // heuristics at this point so simply update the header with a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   651
      // CAS. If we fail this race, the object's bias has been revoked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   652
      // by another thread so we simply return and let the caller deal
489c9b5090e2 Initial load
duke
parents:
diff changeset
   653
      // with it.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   654
      markOop biased_value       = mark;
46678
9b8b0fe92c93 8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents: 40655
diff changeset
   655
      markOop res_mark = obj->cas_set_mark(prototype_header, mark);
49722
a47d1e21b3f1 8199735: Mark word updates need to use Access API
rkennke
parents: 49658
diff changeset
   656
      assert(!obj->mark()->has_bias_pattern(), "even if we raced, should still be revoked");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   657
      return BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   658
    } else if (prototype_header->bias_epoch() != mark->bias_epoch()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   659
      // The epoch of this biasing has expired indicating that the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   660
      // object is effectively unbiased. Depending on whether we need
489c9b5090e2 Initial load
duke
parents:
diff changeset
   661
      // to rebias or revoke the bias of this object we can do it
489c9b5090e2 Initial load
duke
parents:
diff changeset
   662
      // efficiently enough with a CAS that we shouldn't update the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   663
      // heuristics. This is normally done in the assembly code but we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   664
      // can reach this point due to various points in the runtime
489c9b5090e2 Initial load
duke
parents:
diff changeset
   665
      // needing to revoke biases.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   666
      if (attempt_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   667
        assert(THREAD->is_Java_thread(), "");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   668
        markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   669
        markOop rebiased_prototype = markOopDesc::encode((JavaThread*) THREAD, mark->age(), prototype_header->bias_epoch());
46678
9b8b0fe92c93 8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents: 40655
diff changeset
   670
        markOop res_mark = obj->cas_set_mark(rebiased_prototype, mark);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   671
        if (res_mark == biased_value) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   672
          return BIAS_REVOKED_AND_REBIASED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   673
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   674
      } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   675
        markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   676
        markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age());
46678
9b8b0fe92c93 8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents: 40655
diff changeset
   677
        markOop res_mark = obj->cas_set_mark(unbiased_prototype, mark);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   678
        if (res_mark == biased_value) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   679
          return BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   680
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   681
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   682
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   683
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   684
489c9b5090e2 Initial load
duke
parents:
diff changeset
   685
  HeuristicsResult heuristics = update_heuristics(obj(), attempt_rebias);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   686
  if (heuristics == HR_NOT_BIASED) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   687
    return NOT_BIASED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   688
  } else if (heuristics == HR_SINGLE_REVOKE) {
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
   689
    Klass *k = obj->klass();
1600
776009a04496 6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents: 670
diff changeset
   690
    markOop prototype_header = k->prototype_header();
776009a04496 6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents: 670
diff changeset
   691
    if (mark->biased_locker() == THREAD &&
776009a04496 6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents: 670
diff changeset
   692
        prototype_header->bias_epoch() == mark->bias_epoch()) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   693
      // A thread is trying to revoke the bias of an object biased
489c9b5090e2 Initial load
duke
parents:
diff changeset
   694
      // toward it, again likely due to an identity hash code
489c9b5090e2 Initial load
duke
parents:
diff changeset
   695
      // computation. We can again avoid a safepoint in this case
489c9b5090e2 Initial load
duke
parents:
diff changeset
   696
      // since we are only going to walk our own stack. There are no
489c9b5090e2 Initial load
duke
parents:
diff changeset
   697
      // races with revocations occurring in other threads because we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   698
      // reach no safepoints in the revocation path.
1600
776009a04496 6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents: 670
diff changeset
   699
      // Also check the epoch because even if threads match, another thread
776009a04496 6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents: 670
diff changeset
   700
      // can come in with a CAS to steal the bias of an object that has a
776009a04496 6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents: 670
diff changeset
   701
      // stale epoch.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   702
      ResourceMark rm;
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   703
      log_info(biasedlocking)("Revoking bias by walking my own stack:");
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   704
      EventBiasedLockSelfRevocation event;
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   705
      BiasedLocking::Condition cond = revoke_bias(obj(), false, false, (JavaThread*) THREAD, NULL);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   706
      ((JavaThread*) THREAD)->set_cached_monitor_info(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   707
      assert(cond == BIAS_REVOKED, "why not?");
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   708
      if (event.should_commit()) {
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   709
        post_self_revocation_event(&event, k);
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   710
      }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   711
      return cond;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   712
    } else {
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   713
      EventBiasedLockRevocation event;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   714
      VM_RevokeBias revoke(&obj, (JavaThread*) THREAD);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   715
      VMThread::execute(&revoke);
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   716
      if (event.should_commit() && revoke.status_code() != NOT_BIASED) {
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   717
        post_revocation_event(&event, k, &revoke);
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   718
      }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   719
      return revoke.status_code();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   720
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   721
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   722
489c9b5090e2 Initial load
duke
parents:
diff changeset
   723
  assert((heuristics == HR_BULK_REVOKE) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   724
         (heuristics == HR_BULK_REBIAS), "?");
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   725
  EventBiasedLockClassRevocation event;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   726
  VM_BulkRevokeBias bulk_revoke(&obj, (JavaThread*) THREAD,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   727
                                (heuristics == HR_BULK_REBIAS),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   728
                                attempt_rebias);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   729
  VMThread::execute(&bulk_revoke);
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   730
  if (event.should_commit()) {
50113
caf115bb98ad 8199712: Flight Recorder
egahlin
parents: 49722
diff changeset
   731
    post_class_revocation_event(&event, obj->klass(), heuristics != HR_BULK_REBIAS);
47632
0c2e1f8eccaa 8187042: Events to show which objects are associated with biased object revocations
egahlin
parents: 47216
diff changeset
   732
  }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   733
  return bulk_revoke.status_code();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   734
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   735
489c9b5090e2 Initial load
duke
parents:
diff changeset
   736
489c9b5090e2 Initial load
duke
parents:
diff changeset
   737
void BiasedLocking::revoke(GrowableArray<Handle>* objs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   738
  assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   739
  if (objs->length() == 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   740
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   741
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   742
  VM_RevokeBias revoke(objs, JavaThread::current());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   743
  VMThread::execute(&revoke);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   744
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   745
489c9b5090e2 Initial load
duke
parents:
diff changeset
   746
489c9b5090e2 Initial load
duke
parents:
diff changeset
   747
void BiasedLocking::revoke_at_safepoint(Handle h_obj) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   748
  assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   749
  oop obj = h_obj();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   750
  HeuristicsResult heuristics = update_heuristics(obj, false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   751
  if (heuristics == HR_SINGLE_REVOKE) {
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   752
    revoke_bias(obj, false, false, NULL, NULL);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   753
  } else if ((heuristics == HR_BULK_REBIAS) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   754
             (heuristics == HR_BULK_REVOKE)) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   755
    bulk_revoke_or_rebias_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), false, NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   756
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   757
  clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   758
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   759
489c9b5090e2 Initial load
duke
parents:
diff changeset
   760
489c9b5090e2 Initial load
duke
parents:
diff changeset
   761
void BiasedLocking::revoke_at_safepoint(GrowableArray<Handle>* objs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   762
  assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   763
  int len = objs->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   764
  for (int i = 0; i < len; i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   765
    oop obj = (objs->at(i))();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   766
    HeuristicsResult heuristics = update_heuristics(obj, false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   767
    if (heuristics == HR_SINGLE_REVOKE) {
47764
029d5efaaa6c 8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents: 47632
diff changeset
   768
      revoke_bias(obj, false, false, NULL, NULL);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   769
    } else if ((heuristics == HR_BULK_REBIAS) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   770
               (heuristics == HR_BULK_REVOKE)) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   771
      bulk_revoke_or_rebias_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), false, NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   772
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   773
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   774
  clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   775
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   776
489c9b5090e2 Initial load
duke
parents:
diff changeset
   777
489c9b5090e2 Initial load
duke
parents:
diff changeset
   778
void BiasedLocking::preserve_marks() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   779
  if (!UseBiasedLocking)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   780
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   781
489c9b5090e2 Initial load
duke
parents:
diff changeset
   782
  assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   783
489c9b5090e2 Initial load
duke
parents:
diff changeset
   784
  assert(_preserved_oop_stack  == NULL, "double initialization");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   785
  assert(_preserved_mark_stack == NULL, "double initialization");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   786
489c9b5090e2 Initial load
duke
parents:
diff changeset
   787
  // In order to reduce the number of mark words preserved during GC
489c9b5090e2 Initial load
duke
parents:
diff changeset
   788
  // due to the presence of biased locking, we reinitialize most mark
489c9b5090e2 Initial load
duke
parents:
diff changeset
   789
  // words to the class's prototype during GC -- even those which have
489c9b5090e2 Initial load
duke
parents:
diff changeset
   790
  // a currently valid bias owner. One important situation where we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   791
  // must not clobber a bias is when a biased object is currently
489c9b5090e2 Initial load
duke
parents:
diff changeset
   792
  // locked. To handle this case we iterate over the currently-locked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   793
  // monitors in a prepass and, if they are biased, preserve their
489c9b5090e2 Initial load
duke
parents:
diff changeset
   794
  // mark words here. This should be a relatively small set of objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   795
  // especially compared to the number of objects in the heap.
13195
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 7397
diff changeset
   796
  _preserved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(10, true);
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 7397
diff changeset
   797
  _preserved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Handle>(10, true);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   798
489c9b5090e2 Initial load
duke
parents:
diff changeset
   799
  ResourceMark rm;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   800
  Thread* cur = Thread::current();
48105
8d15b1369c7a 8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents: 47764
diff changeset
   801
  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   802
    if (thread->has_last_Java_frame()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   803
      RegisterMap rm(thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   804
      for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   805
        GrowableArray<MonitorInfo*> *monitors = vf->monitors();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   806
        if (monitors != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   807
          int len = monitors->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   808
          // Walk monitors youngest to oldest
489c9b5090e2 Initial load
duke
parents:
diff changeset
   809
          for (int i = len - 1; i >= 0; i--) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   810
            MonitorInfo* mon_info = monitors->at(i);
3171
aa289b22b577 6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
kvn
parents: 1600
diff changeset
   811
            if (mon_info->owner_is_scalar_replaced()) continue;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   812
            oop owner = mon_info->owner();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   813
            if (owner != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   814
              markOop mark = owner->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   815
              if (mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   816
                _preserved_oop_stack->push(Handle(cur, owner));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   817
                _preserved_mark_stack->push(mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   818
              }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   819
            }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   820
          }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   821
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   822
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   823
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   824
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   825
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   826
489c9b5090e2 Initial load
duke
parents:
diff changeset
   827
489c9b5090e2 Initial load
duke
parents:
diff changeset
   828
void BiasedLocking::restore_marks() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   829
  if (!UseBiasedLocking)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   830
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   831
489c9b5090e2 Initial load
duke
parents:
diff changeset
   832
  assert(_preserved_oop_stack  != NULL, "double free");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   833
  assert(_preserved_mark_stack != NULL, "double free");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   834
489c9b5090e2 Initial load
duke
parents:
diff changeset
   835
  int len = _preserved_oop_stack->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   836
  for (int i = 0; i < len; i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   837
    Handle owner = _preserved_oop_stack->at(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   838
    markOop mark = _preserved_mark_stack->at(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   839
    owner->set_mark(mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   840
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   841
489c9b5090e2 Initial load
duke
parents:
diff changeset
   842
  delete _preserved_oop_stack;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   843
  _preserved_oop_stack = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   844
  delete _preserved_mark_stack;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   845
  _preserved_mark_stack = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   846
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   847
489c9b5090e2 Initial load
duke
parents:
diff changeset
   848
489c9b5090e2 Initial load
duke
parents:
diff changeset
   849
int* BiasedLocking::total_entry_count_addr()                   { return _counters.total_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   850
int* BiasedLocking::biased_lock_entry_count_addr()             { return _counters.biased_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   851
int* BiasedLocking::anonymously_biased_lock_entry_count_addr() { return _counters.anonymously_biased_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   852
int* BiasedLocking::rebiased_lock_entry_count_addr()           { return _counters.rebiased_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   853
int* BiasedLocking::revoked_lock_entry_count_addr()            { return _counters.revoked_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   854
int* BiasedLocking::fast_path_entry_count_addr()               { return _counters.fast_path_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   855
int* BiasedLocking::slow_path_entry_count_addr()               { return _counters.slow_path_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   856
489c9b5090e2 Initial load
duke
parents:
diff changeset
   857
489c9b5090e2 Initial load
duke
parents:
diff changeset
   858
// BiasedLockingCounters
489c9b5090e2 Initial load
duke
parents:
diff changeset
   859
489c9b5090e2 Initial load
duke
parents:
diff changeset
   860
int BiasedLockingCounters::slow_path_entry_count() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   861
  if (_slow_path_entry_count != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   862
    return _slow_path_entry_count;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   863
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   864
  int sum = _biased_lock_entry_count   + _anonymously_biased_lock_entry_count +
489c9b5090e2 Initial load
duke
parents:
diff changeset
   865
            _rebiased_lock_entry_count + _revoked_lock_entry_count +
489c9b5090e2 Initial load
duke
parents:
diff changeset
   866
            _fast_path_entry_count;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   867
489c9b5090e2 Initial load
duke
parents:
diff changeset
   868
  return _total_entry_count - sum;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   869
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   870
489c9b5090e2 Initial load
duke
parents:
diff changeset
   871
void BiasedLockingCounters::print_on(outputStream* st) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   872
  tty->print_cr("# total entries: %d", _total_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   873
  tty->print_cr("# biased lock entries: %d", _biased_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   874
  tty->print_cr("# anonymously biased lock entries: %d", _anonymously_biased_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   875
  tty->print_cr("# rebiased lock entries: %d", _rebiased_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   876
  tty->print_cr("# revoked lock entries: %d", _revoked_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   877
  tty->print_cr("# fast path lock entries: %d", _fast_path_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   878
  tty->print_cr("# slow path lock entries: %d", slow_path_entry_count());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   879
}