hotspot/src/share/vm/runtime/biasedLocking.cpp
author dholmes
Sun, 21 Aug 2016 20:56:37 -0400
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parent 37251 9fc139ad74b5
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permissions -rw-r--r--
8157907: Incorrect inclusion of atomic.hpp instead of atomic.inline.hpp Summary: Remove atomic.inline.hpp and move the contents back into atomic.hpp Reviewed-by: stefank, pliden, simonis
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/*
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 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "logging/log.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/markOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/basicLock.hpp"
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#include "runtime/biasedLocking.hpp"
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#include "runtime/task.hpp"
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#include "runtime/vframe.hpp"
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#include "runtime/vmThread.hpp"
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#include "runtime/vm_operations.hpp"
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static bool _biased_locking_enabled = false;
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BiasedLockingCounters BiasedLocking::_counters;
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static GrowableArray<Handle>*  _preserved_oop_stack  = NULL;
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static GrowableArray<markOop>* _preserved_mark_stack = NULL;
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static void enable_biased_locking(Klass* k) {
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  k->set_prototype_header(markOopDesc::biased_locking_prototype());
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}
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class VM_EnableBiasedLocking: public VM_Operation {
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 private:
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  bool _is_cheap_allocated;
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 public:
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  VM_EnableBiasedLocking(bool is_cheap_allocated) { _is_cheap_allocated = is_cheap_allocated; }
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  VMOp_Type type() const          { return VMOp_EnableBiasedLocking; }
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  Mode evaluation_mode() const    { return _is_cheap_allocated ? _async_safepoint : _safepoint; }
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  bool is_cheap_allocated() const { return _is_cheap_allocated; }
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  void doit() {
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    // Iterate the system dictionary enabling biased locking for all
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    // currently loaded classes
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    SystemDictionary::classes_do(enable_biased_locking);
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    // Indicate that future instances should enable it as well
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    _biased_locking_enabled = true;
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    log_info(biasedlocking)("Biased locking enabled");
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  }
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  bool allow_nested_vm_operations() const        { return false; }
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};
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// One-shot PeriodicTask subclass for enabling biased locking
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class EnableBiasedLockingTask : public PeriodicTask {
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 public:
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  EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {}
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  virtual void task() {
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    // Use async VM operation to avoid blocking the Watcher thread.
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    // VM Thread will free C heap storage.
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    VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking(true);
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    VMThread::execute(op);
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    // Reclaim our storage and disenroll ourself
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    delete this;
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  }
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};
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void BiasedLocking::init() {
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  // If biased locking is enabled, schedule a task to fire a few
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  // seconds into the run which turns on biased locking for all
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  // currently loaded classes as well as future ones. This is a
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  // workaround for startup time regressions due to a large number of
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  // safepoints being taken during VM startup for bias revocation.
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  // Ideally we would have a lower cost for individual bias revocation
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  // and not need a mechanism like this.
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  if (UseBiasedLocking) {
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    if (BiasedLockingStartupDelay > 0) {
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      EnableBiasedLockingTask* task = new EnableBiasedLockingTask(BiasedLockingStartupDelay);
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      task->enroll();
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    } else {
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      VM_EnableBiasedLocking op(false);
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      VMThread::execute(&op);
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    }
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  }
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}
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bool BiasedLocking::enabled() {
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  return _biased_locking_enabled;
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}
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// Returns MonitorInfos for all objects locked on this thread in youngest to oldest order
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static GrowableArray<MonitorInfo*>* get_or_compute_monitor_info(JavaThread* thread) {
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  GrowableArray<MonitorInfo*>* info = thread->cached_monitor_info();
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  if (info != NULL) {
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    return info;
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  }
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  info = new GrowableArray<MonitorInfo*>();
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  // It's possible for the thread to not have any Java frames on it,
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  // i.e., if it's the main thread and it's already returned from main()
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  if (thread->has_last_Java_frame()) {
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    RegisterMap rm(thread);
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    for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) {
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      GrowableArray<MonitorInfo*> *monitors = vf->monitors();
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      if (monitors != NULL) {
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        int len = monitors->length();
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        // Walk monitors youngest to oldest
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        for (int i = len - 1; i >= 0; i--) {
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          MonitorInfo* mon_info = monitors->at(i);
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          if (mon_info->eliminated()) continue;
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          oop owner = mon_info->owner();
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          if (owner != NULL) {
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            info->append(mon_info);
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          }
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        }
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      }
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    }
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  }
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  thread->set_cached_monitor_info(info);
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  return info;
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}
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static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_bulk, JavaThread* requesting_thread) {
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  markOop mark = obj->mark();
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  if (!mark->has_bias_pattern()) {
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    if (log_is_enabled(Info, biasedlocking)) {
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      ResourceMark rm;
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      log_info(biasedlocking)("  (Skipping revocation of object " INTPTR_FORMAT
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                              ", mark " INTPTR_FORMAT ", type %s"
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                              ", requesting thread " INTPTR_FORMAT
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                              " because it's no longer biased)",
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                              p2i((void *)obj), (intptr_t) mark,
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                              obj->klass()->external_name(),
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                              (intptr_t) requesting_thread);
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    }
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    return BiasedLocking::NOT_BIASED;
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  }
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  uint age = mark->age();
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  markOop   biased_prototype = markOopDesc::biased_locking_prototype()->set_age(age);
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  markOop unbiased_prototype = markOopDesc::prototype()->set_age(age);
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  // Log at "info" level if not bulk, else "trace" level
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  if (!is_bulk) {
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    ResourceMark rm;
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    log_info(biasedlocking)("Revoking bias of object " INTPTR_FORMAT ", mark "
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                            INTPTR_FORMAT ", type %s, prototype header " INTPTR_FORMAT
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                            ", allow rebias %d, requesting thread " INTPTR_FORMAT,
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                            p2i((void *)obj),
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                            (intptr_t) mark,
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                            obj->klass()->external_name(),
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                            (intptr_t) obj->klass()->prototype_header(),
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                            (allow_rebias ? 1 : 0),
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                            (intptr_t) requesting_thread);
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  } else {
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    ResourceMark rm;
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    log_trace(biasedlocking)("Revoking bias of object " INTPTR_FORMAT " , mark "
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                             INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT
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                             " , allow rebias %d , requesting thread " INTPTR_FORMAT,
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                             p2i((void *)obj),
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                             (intptr_t) mark,
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                             obj->klass()->external_name(),
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                             (intptr_t) obj->klass()->prototype_header(),
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                             (allow_rebias ? 1 : 0),
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                             (intptr_t) requesting_thread);
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  }
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  JavaThread* biased_thread = mark->biased_locker();
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  if (biased_thread == NULL) {
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    // Object is anonymously biased. We can get here if, for
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    // example, we revoke the bias due to an identity hash code
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    // being computed for an object.
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    if (!allow_rebias) {
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      obj->set_mark(unbiased_prototype);
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    }
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    // Log at "info" level if not bulk, else "trace" level
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    if (!is_bulk) {
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      log_info(biasedlocking)("  Revoked bias of anonymously-biased object");
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    } else {
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      log_trace(biasedlocking)("  Revoked bias of anonymously-biased object");
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    }
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    return BiasedLocking::BIAS_REVOKED;
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  }
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  // Handle case where the thread toward which the object was biased has exited
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  bool thread_is_alive = false;
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  if (requesting_thread == biased_thread) {
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    thread_is_alive = true;
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  } else {
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    for (JavaThread* cur_thread = Threads::first(); cur_thread != NULL; cur_thread = cur_thread->next()) {
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      if (cur_thread == biased_thread) {
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        thread_is_alive = true;
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        break;
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   218
      }
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    }
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  }
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  if (!thread_is_alive) {
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    if (allow_rebias) {
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      obj->set_mark(biased_prototype);
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    } else {
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      obj->set_mark(unbiased_prototype);
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    }
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    // Log at "info" level if not bulk, else "trace" level
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    if (!is_bulk) {
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      log_info(biasedlocking)("  Revoked bias of object biased toward dead thread ("
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                              PTR_FORMAT ")", p2i(biased_thread));
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    } else {
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      log_trace(biasedlocking)("  Revoked bias of object biased toward dead thread ("
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                               PTR_FORMAT ")", p2i(biased_thread));
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    }
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    return BiasedLocking::BIAS_REVOKED;
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  }
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  // Log at "info" level if not bulk, else "trace" level
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  if (!is_bulk) {
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    log_info(biasedlocking)("  Revoked bias of object biased toward live thread ("
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                            PTR_FORMAT ")", p2i(biased_thread));
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  } else {
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    log_trace(biasedlocking)("  Revoked bias of object biased toward live thread ("
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                               PTR_FORMAT ")", p2i(biased_thread));
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  }
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1
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  // Thread owning bias is alive.
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  // Check to see whether it currently owns the lock and, if so,
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  // write down the needed displaced headers to the thread's stack.
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  // Otherwise, restore the object's header either to the unlocked
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  // or unbiased state.
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  GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(biased_thread);
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  BasicLock* highest_lock = NULL;
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  for (int i = 0; i < cached_monitor_info->length(); i++) {
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    MonitorInfo* mon_info = cached_monitor_info->at(i);
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    if (mon_info->owner() == obj) {
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      log_trace(biasedlocking)("   mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")",
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                               p2i((void *) mon_info->owner()),
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                               p2i((void *) obj));
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      // Assume recursive case and fix up highest lock later
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      markOop mark = markOopDesc::encode((BasicLock*) NULL);
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      highest_lock = mon_info->lock();
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      highest_lock->set_displaced_header(mark);
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    } else {
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      log_trace(biasedlocking)("   mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")",
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                               p2i((void *) mon_info->owner()),
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                               p2i((void *) obj));
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    }
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  }
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  if (highest_lock != NULL) {
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    // Fix up highest lock to contain displaced header and point
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    // object at it
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    highest_lock->set_displaced_header(unbiased_prototype);
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    // Reset object header to point to displaced mark.
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    // Must release storing the lock address for platforms without TSO
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    // ordering (e.g. ppc).
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    obj->release_set_mark(markOopDesc::encode(highest_lock));
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    assert(!obj->mark()->has_bias_pattern(), "illegal mark state: stack lock used bias bit");
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    // Log at "info" level if not bulk, else "trace" level
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    if (!is_bulk) {
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      log_info(biasedlocking)("  Revoked bias of currently-locked object");
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   282
    } else {
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      log_trace(biasedlocking)("  Revoked bias of currently-locked object");
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    }
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   285
  } else {
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    // Log at "info" level if not bulk, else "trace" level
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   287
    if (!is_bulk) {
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      log_info(biasedlocking)("  Revoked bias of currently-unlocked object");
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   289
    } else {
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      log_trace(biasedlocking)("  Revoked bias of currently-unlocked object");
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   291
    }
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   292
    if (allow_rebias) {
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   293
      obj->set_mark(biased_prototype);
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   294
    } else {
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   295
      // Store the unlocked value into the object's header.
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   296
      obj->set_mark(unbiased_prototype);
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   297
    }
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   298
  }
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   299
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  return BiasedLocking::BIAS_REVOKED;
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   301
}
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   302
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   303
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enum HeuristicsResult {
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   305
  HR_NOT_BIASED    = 1,
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   306
  HR_SINGLE_REVOKE = 2,
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   307
  HR_BULK_REBIAS   = 3,
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   308
  HR_BULK_REVOKE   = 4
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   309
};
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   310
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static HeuristicsResult update_heuristics(oop o, bool allow_rebias) {
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   313
  markOop mark = o->mark();
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   314
  if (!mark->has_bias_pattern()) {
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   315
    return HR_NOT_BIASED;
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   316
  }
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   317
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  // Heuristics to attempt to throttle the number of revocations.
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  // Stages:
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  // 1. Revoke the biases of all objects in the heap of this type,
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   321
  //    but allow rebiasing of those objects if unlocked.
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   322
  // 2. Revoke the biases of all objects in the heap of this type
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  //    and don't allow rebiasing of these objects. Disable
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  //    allocation of objects of that type with the bias bit set.
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  Klass* k = o->klass();
1
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   326
  jlong cur_time = os::javaTimeMillis();
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   327
  jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time();
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   328
  int revocation_count = k->biased_lock_revocation_count();
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   329
  if ((revocation_count >= BiasedLockingBulkRebiasThreshold) &&
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   330
      (revocation_count <  BiasedLockingBulkRevokeThreshold) &&
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   331
      (last_bulk_revocation_time != 0) &&
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   332
      (cur_time - last_bulk_revocation_time >= BiasedLockingDecayTime)) {
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   333
    // This is the first revocation we've seen in a while of an
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   334
    // object of this type since the last time we performed a bulk
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   335
    // rebiasing operation. The application is allocating objects in
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   336
    // bulk which are biased toward a thread and then handing them
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   337
    // off to another thread. We can cope with this allocation
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   338
    // pattern via the bulk rebiasing mechanism so we reset the
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   339
    // klass's revocation count rather than allow it to increase
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   340
    // monotonically. If we see the need to perform another bulk
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   341
    // rebias operation later, we will, and if subsequently we see
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   342
    // many more revocation operations in a short period of time we
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   343
    // will completely disable biasing for this type.
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   344
    k->set_biased_lock_revocation_count(0);
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   345
    revocation_count = 0;
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   346
  }
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diff changeset
   347
489c9b5090e2 Initial load
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   348
  // Make revocation count saturate just beyond BiasedLockingBulkRevokeThreshold
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diff changeset
   349
  if (revocation_count <= BiasedLockingBulkRevokeThreshold) {
489c9b5090e2 Initial load
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diff changeset
   350
    revocation_count = k->atomic_incr_biased_lock_revocation_count();
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   351
  }
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parents:
diff changeset
   352
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diff changeset
   353
  if (revocation_count == BiasedLockingBulkRevokeThreshold) {
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diff changeset
   354
    return HR_BULK_REVOKE;
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diff changeset
   355
  }
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parents:
diff changeset
   356
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parents:
diff changeset
   357
  if (revocation_count == BiasedLockingBulkRebiasThreshold) {
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diff changeset
   358
    return HR_BULK_REBIAS;
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diff changeset
   359
  }
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parents:
diff changeset
   360
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   361
  return HR_SINGLE_REVOKE;
489c9b5090e2 Initial load
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parents:
diff changeset
   362
}
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parents:
diff changeset
   363
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parents:
diff changeset
   364
489c9b5090e2 Initial load
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diff changeset
   365
static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o,
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parents:
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   366
                                                                   bool bulk_rebias,
489c9b5090e2 Initial load
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parents:
diff changeset
   367
                                                                   bool attempt_rebias_of_object,
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parents:
diff changeset
   368
                                                                   JavaThread* requesting_thread) {
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parents:
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   369
  assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
489c9b5090e2 Initial load
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diff changeset
   370
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   371
  log_info(biasedlocking)("* Beginning bulk revocation (kind == %s) because of object "
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
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parents: 29081
diff changeset
   372
                          INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s",
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   373
                          (bulk_rebias ? "rebias" : "revoke"),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   374
                          p2i((void *) o),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
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diff changeset
   375
                          (intptr_t) o->mark(),
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
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   376
                          o->klass()->external_name());
1
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   377
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   378
  jlong cur_time = os::javaTimeMillis();
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coleenp
parents: 13195
diff changeset
   379
  o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time);
1
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parents:
diff changeset
   380
489c9b5090e2 Initial load
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diff changeset
   381
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   382
  Klass* k_o = o->klass();
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
   383
  Klass* klass = k_o;
1
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parents:
diff changeset
   384
489c9b5090e2 Initial load
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parents:
diff changeset
   385
  if (bulk_rebias) {
489c9b5090e2 Initial load
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parents:
diff changeset
   386
    // Use the epoch in the klass of the object to implicitly revoke
489c9b5090e2 Initial load
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parents:
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   387
    // all biases of objects of this data type and force them to be
489c9b5090e2 Initial load
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parents:
diff changeset
   388
    // reacquired. However, we also need to walk the stacks of all
489c9b5090e2 Initial load
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parents:
diff changeset
   389
    // threads and update the headers of lightweight locked objects
489c9b5090e2 Initial load
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parents:
diff changeset
   390
    // with biases to have the current epoch.
489c9b5090e2 Initial load
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parents:
diff changeset
   391
489c9b5090e2 Initial load
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parents:
diff changeset
   392
    // If the prototype header doesn't have the bias pattern, don't
489c9b5090e2 Initial load
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parents:
diff changeset
   393
    // try to update the epoch -- assume another VM operation came in
489c9b5090e2 Initial load
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parents:
diff changeset
   394
    // and reset the header to the unbiased state, which will
489c9b5090e2 Initial load
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parents:
diff changeset
   395
    // implicitly cause all existing biases to be revoked
489c9b5090e2 Initial load
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parents:
diff changeset
   396
    if (klass->prototype_header()->has_bias_pattern()) {
489c9b5090e2 Initial load
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parents:
diff changeset
   397
      int prev_epoch = klass->prototype_header()->bias_epoch();
489c9b5090e2 Initial load
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parents:
diff changeset
   398
      klass->set_prototype_header(klass->prototype_header()->incr_bias_epoch());
489c9b5090e2 Initial load
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parents:
diff changeset
   399
      int cur_epoch = klass->prototype_header()->bias_epoch();
489c9b5090e2 Initial load
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parents:
diff changeset
   400
489c9b5090e2 Initial load
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parents:
diff changeset
   401
      // Now walk all threads' stacks and adjust epochs of any biased
489c9b5090e2 Initial load
duke
parents:
diff changeset
   402
      // and locked objects of this data type we encounter
489c9b5090e2 Initial load
duke
parents:
diff changeset
   403
      for (JavaThread* thr = Threads::first(); thr != NULL; thr = thr->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   404
        GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   405
        for (int i = 0; i < cached_monitor_info->length(); i++) {
489c9b5090e2 Initial load
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parents:
diff changeset
   406
          MonitorInfo* mon_info = cached_monitor_info->at(i);
489c9b5090e2 Initial load
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parents:
diff changeset
   407
          oop owner = mon_info->owner();
489c9b5090e2 Initial load
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parents:
diff changeset
   408
          markOop mark = owner->mark();
489c9b5090e2 Initial load
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parents:
diff changeset
   409
          if ((owner->klass() == k_o) && mark->has_bias_pattern()) {
489c9b5090e2 Initial load
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parents:
diff changeset
   410
            // We might have encountered this object already in the case of recursive locking
489c9b5090e2 Initial load
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   411
            assert(mark->bias_epoch() == prev_epoch || mark->bias_epoch() == cur_epoch, "error in bias epoch adjustment");
489c9b5090e2 Initial load
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parents:
diff changeset
   412
            owner->set_mark(mark->set_bias_epoch(cur_epoch));
489c9b5090e2 Initial load
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parents:
diff changeset
   413
          }
489c9b5090e2 Initial load
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parents:
diff changeset
   414
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   415
      }
489c9b5090e2 Initial load
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parents:
diff changeset
   416
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   417
489c9b5090e2 Initial load
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parents:
diff changeset
   418
    // At this point we're done. All we have to do is potentially
489c9b5090e2 Initial load
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parents:
diff changeset
   419
    // adjust the header of the given object to revoke its bias.
489c9b5090e2 Initial load
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parents:
diff changeset
   420
    revoke_bias(o, attempt_rebias_of_object && klass->prototype_header()->has_bias_pattern(), true, requesting_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   421
  } else {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
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parents: 29081
diff changeset
   422
    if (log_is_enabled(Info, biasedlocking)) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   423
      ResourceMark rm;
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
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parents: 29081
diff changeset
   424
      log_info(biasedlocking)("* Disabling biased locking for type %s", klass->external_name());
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   425
    }
489c9b5090e2 Initial load
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parents:
diff changeset
   426
489c9b5090e2 Initial load
duke
parents:
diff changeset
   427
    // Disable biased locking for this data type. Not only will this
489c9b5090e2 Initial load
duke
parents:
diff changeset
   428
    // cause future instances to not be biased, but existing biased
489c9b5090e2 Initial load
duke
parents:
diff changeset
   429
    // instances will notice that this implicitly caused their biases
489c9b5090e2 Initial load
duke
parents:
diff changeset
   430
    // to be revoked.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   431
    klass->set_prototype_header(markOopDesc::prototype());
489c9b5090e2 Initial load
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parents:
diff changeset
   432
489c9b5090e2 Initial load
duke
parents:
diff changeset
   433
    // Now walk all threads' stacks and forcibly revoke the biases of
489c9b5090e2 Initial load
duke
parents:
diff changeset
   434
    // any locked and biased objects of this data type we encounter.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   435
    for (JavaThread* thr = Threads::first(); thr != NULL; thr = thr->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   436
      GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   437
      for (int i = 0; i < cached_monitor_info->length(); i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   438
        MonitorInfo* mon_info = cached_monitor_info->at(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   439
        oop owner = mon_info->owner();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   440
        markOop mark = owner->mark();
489c9b5090e2 Initial load
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parents:
diff changeset
   441
        if ((owner->klass() == k_o) && mark->has_bias_pattern()) {
489c9b5090e2 Initial load
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parents:
diff changeset
   442
          revoke_bias(owner, false, true, requesting_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   443
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   444
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   445
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   446
489c9b5090e2 Initial load
duke
parents:
diff changeset
   447
    // Must force the bias of the passed object to be forcibly revoked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   448
    // as well to ensure guarantees to callers
489c9b5090e2 Initial load
duke
parents:
diff changeset
   449
    revoke_bias(o, false, true, requesting_thread);
489c9b5090e2 Initial load
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parents:
diff changeset
   450
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   451
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   452
  log_info(biasedlocking)("* Ending bulk revocation");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   453
489c9b5090e2 Initial load
duke
parents:
diff changeset
   454
  BiasedLocking::Condition status_code = BiasedLocking::BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   455
489c9b5090e2 Initial load
duke
parents:
diff changeset
   456
  if (attempt_rebias_of_object &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   457
      o->mark()->has_bias_pattern() &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   458
      klass->prototype_header()->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   459
    markOop new_mark = markOopDesc::encode(requesting_thread, o->mark()->age(),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   460
                                           klass->prototype_header()->bias_epoch());
489c9b5090e2 Initial load
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parents:
diff changeset
   461
    o->set_mark(new_mark);
489c9b5090e2 Initial load
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parents:
diff changeset
   462
    status_code = BiasedLocking::BIAS_REVOKED_AND_REBIASED;
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   463
    log_info(biasedlocking)("  Rebiased object toward thread " INTPTR_FORMAT, (intptr_t) requesting_thread);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   464
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   465
489c9b5090e2 Initial load
duke
parents:
diff changeset
   466
  assert(!o->mark()->has_bias_pattern() ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   467
         (attempt_rebias_of_object && (o->mark()->biased_locker() == requesting_thread)),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   468
         "bug in bulk bias revocation");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   469
489c9b5090e2 Initial load
duke
parents:
diff changeset
   470
  return status_code;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   471
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   472
489c9b5090e2 Initial load
duke
parents:
diff changeset
   473
489c9b5090e2 Initial load
duke
parents:
diff changeset
   474
static void clean_up_cached_monitor_info() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   475
  // Walk the thread list clearing out the cached monitors
489c9b5090e2 Initial load
duke
parents:
diff changeset
   476
  for (JavaThread* thr = Threads::first(); thr != NULL; thr = thr->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   477
    thr->set_cached_monitor_info(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   478
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   479
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   480
489c9b5090e2 Initial load
duke
parents:
diff changeset
   481
489c9b5090e2 Initial load
duke
parents:
diff changeset
   482
class VM_RevokeBias : public VM_Operation {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   483
protected:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   484
  Handle* _obj;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   485
  GrowableArray<Handle>* _objs;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   486
  JavaThread* _requesting_thread;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   487
  BiasedLocking::Condition _status_code;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   488
489c9b5090e2 Initial load
duke
parents:
diff changeset
   489
public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   490
  VM_RevokeBias(Handle* obj, JavaThread* requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   491
    : _obj(obj)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   492
    , _objs(NULL)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   493
    , _requesting_thread(requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   494
    , _status_code(BiasedLocking::NOT_BIASED) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   495
489c9b5090e2 Initial load
duke
parents:
diff changeset
   496
  VM_RevokeBias(GrowableArray<Handle>* objs, JavaThread* requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   497
    : _obj(NULL)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   498
    , _objs(objs)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   499
    , _requesting_thread(requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   500
    , _status_code(BiasedLocking::NOT_BIASED) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   501
489c9b5090e2 Initial load
duke
parents:
diff changeset
   502
  virtual VMOp_Type type() const { return VMOp_RevokeBias; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   503
489c9b5090e2 Initial load
duke
parents:
diff changeset
   504
  virtual bool doit_prologue() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   505
    // Verify that there is actual work to do since the callers just
489c9b5090e2 Initial load
duke
parents:
diff changeset
   506
    // give us locked object(s). If we don't find any biased objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   507
    // there is nothing to do and we avoid a safepoint.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   508
    if (_obj != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   509
      markOop mark = (*_obj)()->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   510
      if (mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   511
        return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   512
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   513
    } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   514
      for ( int i = 0 ; i < _objs->length(); i++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   515
        markOop mark = (_objs->at(i))()->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   516
        if (mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   517
          return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   518
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   519
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   520
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   521
    return false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   522
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   523
489c9b5090e2 Initial load
duke
parents:
diff changeset
   524
  virtual void doit() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   525
    if (_obj != NULL) {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   526
      log_info(biasedlocking)("Revoking bias with potentially per-thread safepoint:");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   527
      _status_code = revoke_bias((*_obj)(), false, false, _requesting_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   528
      clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   529
      return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   530
    } else {
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   531
      log_info(biasedlocking)("Revoking bias with global safepoint:");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   532
      BiasedLocking::revoke_at_safepoint(_objs);
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
  BiasedLocking::Condition status_code() const {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   537
    return _status_code;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   538
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   539
};
489c9b5090e2 Initial load
duke
parents:
diff changeset
   540
489c9b5090e2 Initial load
duke
parents:
diff changeset
   541
489c9b5090e2 Initial load
duke
parents:
diff changeset
   542
class VM_BulkRevokeBias : public VM_RevokeBias {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   543
private:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   544
  bool _bulk_rebias;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   545
  bool _attempt_rebias_of_object;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   546
489c9b5090e2 Initial load
duke
parents:
diff changeset
   547
public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   548
  VM_BulkRevokeBias(Handle* obj, JavaThread* requesting_thread,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   549
                    bool bulk_rebias,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   550
                    bool attempt_rebias_of_object)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   551
    : VM_RevokeBias(obj, requesting_thread)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   552
    , _bulk_rebias(bulk_rebias)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   553
    , _attempt_rebias_of_object(attempt_rebias_of_object) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   554
489c9b5090e2 Initial load
duke
parents:
diff changeset
   555
  virtual VMOp_Type type() const { return VMOp_BulkRevokeBias; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   556
  virtual bool doit_prologue()   { return true; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   557
489c9b5090e2 Initial load
duke
parents:
diff changeset
   558
  virtual void doit() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   559
    _status_code = bulk_revoke_or_rebias_at_safepoint((*_obj)(), _bulk_rebias, _attempt_rebias_of_object, _requesting_thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   560
    clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   561
  }
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
BiasedLocking::Condition BiasedLocking::revoke_and_rebias(Handle obj, bool attempt_rebias, TRAPS) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   566
  assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   567
489c9b5090e2 Initial load
duke
parents:
diff changeset
   568
  // We can revoke the biases of anonymously-biased objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   569
  // efficiently enough that we should not cause these revocations to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   570
  // update the heuristics because doing so may cause unwanted bulk
489c9b5090e2 Initial load
duke
parents:
diff changeset
   571
  // revocations (which are expensive) to occur.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   572
  markOop mark = obj->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   573
  if (mark->is_biased_anonymously() && !attempt_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   574
    // We are probably trying to revoke the bias of this object due to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   575
    // an identity hash code computation. Try to revoke the bias
489c9b5090e2 Initial load
duke
parents:
diff changeset
   576
    // without a safepoint. This is possible if we can successfully
489c9b5090e2 Initial load
duke
parents:
diff changeset
   577
    // compare-and-exchange an unbiased header into the mark word of
489c9b5090e2 Initial load
duke
parents:
diff changeset
   578
    // the object, meaning that no other thread has raced to acquire
489c9b5090e2 Initial load
duke
parents:
diff changeset
   579
    // the bias of the object.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   580
    markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   581
    markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   582
    markOop res_mark = (markOop) Atomic::cmpxchg_ptr(unbiased_prototype, obj->mark_addr(), mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   583
    if (res_mark == biased_value) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   584
      return BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   585
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   586
  } else if (mark->has_bias_pattern()) {
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
   587
    Klass* k = obj->klass();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   588
    markOop prototype_header = k->prototype_header();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   589
    if (!prototype_header->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   590
      // This object has a stale bias from before the bulk revocation
489c9b5090e2 Initial load
duke
parents:
diff changeset
   591
      // for this data type occurred. It's pointless to update the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   592
      // heuristics at this point so simply update the header with a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   593
      // CAS. If we fail this race, the object's bias has been revoked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   594
      // by another thread so we simply return and let the caller deal
489c9b5090e2 Initial load
duke
parents:
diff changeset
   595
      // with it.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   596
      markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   597
      markOop res_mark = (markOop) Atomic::cmpxchg_ptr(prototype_header, obj->mark_addr(), mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   598
      assert(!(*(obj->mark_addr()))->has_bias_pattern(), "even if we raced, should still be revoked");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   599
      return BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   600
    } else if (prototype_header->bias_epoch() != mark->bias_epoch()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   601
      // The epoch of this biasing has expired indicating that the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   602
      // object is effectively unbiased. Depending on whether we need
489c9b5090e2 Initial load
duke
parents:
diff changeset
   603
      // to rebias or revoke the bias of this object we can do it
489c9b5090e2 Initial load
duke
parents:
diff changeset
   604
      // efficiently enough with a CAS that we shouldn't update the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   605
      // heuristics. This is normally done in the assembly code but we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   606
      // can reach this point due to various points in the runtime
489c9b5090e2 Initial load
duke
parents:
diff changeset
   607
      // needing to revoke biases.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   608
      if (attempt_rebias) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   609
        assert(THREAD->is_Java_thread(), "");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   610
        markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   611
        markOop rebiased_prototype = markOopDesc::encode((JavaThread*) THREAD, mark->age(), prototype_header->bias_epoch());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   612
        markOop res_mark = (markOop) Atomic::cmpxchg_ptr(rebiased_prototype, obj->mark_addr(), mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   613
        if (res_mark == biased_value) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   614
          return BIAS_REVOKED_AND_REBIASED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   615
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   616
      } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   617
        markOop biased_value       = mark;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   618
        markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   619
        markOop res_mark = (markOop) Atomic::cmpxchg_ptr(unbiased_prototype, obj->mark_addr(), mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   620
        if (res_mark == biased_value) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   621
          return BIAS_REVOKED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   622
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   623
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   624
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   625
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   626
489c9b5090e2 Initial load
duke
parents:
diff changeset
   627
  HeuristicsResult heuristics = update_heuristics(obj(), attempt_rebias);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   628
  if (heuristics == HR_NOT_BIASED) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   629
    return NOT_BIASED;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   630
  } else if (heuristics == HR_SINGLE_REVOKE) {
14488
ab48109f7d1b 8001471: Klass::cast() does nothing
hseigel
parents: 13925
diff changeset
   631
    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
   632
    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
   633
    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
   634
        prototype_header->bias_epoch() == mark->bias_epoch()) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   635
      // A thread is trying to revoke the bias of an object biased
489c9b5090e2 Initial load
duke
parents:
diff changeset
   636
      // toward it, again likely due to an identity hash code
489c9b5090e2 Initial load
duke
parents:
diff changeset
   637
      // computation. We can again avoid a safepoint in this case
489c9b5090e2 Initial load
duke
parents:
diff changeset
   638
      // since we are only going to walk our own stack. There are no
489c9b5090e2 Initial load
duke
parents:
diff changeset
   639
      // races with revocations occurring in other threads because we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   640
      // 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
   641
      // 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
   642
      // 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
   643
      // stale epoch.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   644
      ResourceMark rm;
36186
06763de0d7ad 8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents: 29081
diff changeset
   645
      log_info(biasedlocking)("Revoking bias by walking my own stack:");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   646
      BiasedLocking::Condition cond = revoke_bias(obj(), false, false, (JavaThread*) THREAD);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   647
      ((JavaThread*) THREAD)->set_cached_monitor_info(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   648
      assert(cond == BIAS_REVOKED, "why not?");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   649
      return cond;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   650
    } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   651
      VM_RevokeBias revoke(&obj, (JavaThread*) THREAD);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   652
      VMThread::execute(&revoke);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   653
      return revoke.status_code();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   654
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   655
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   656
489c9b5090e2 Initial load
duke
parents:
diff changeset
   657
  assert((heuristics == HR_BULK_REVOKE) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   658
         (heuristics == HR_BULK_REBIAS), "?");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   659
  VM_BulkRevokeBias bulk_revoke(&obj, (JavaThread*) THREAD,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   660
                                (heuristics == HR_BULK_REBIAS),
489c9b5090e2 Initial load
duke
parents:
diff changeset
   661
                                attempt_rebias);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   662
  VMThread::execute(&bulk_revoke);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   663
  return bulk_revoke.status_code();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   664
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   665
489c9b5090e2 Initial load
duke
parents:
diff changeset
   666
489c9b5090e2 Initial load
duke
parents:
diff changeset
   667
void BiasedLocking::revoke(GrowableArray<Handle>* objs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   668
  assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   669
  if (objs->length() == 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   670
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   671
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   672
  VM_RevokeBias revoke(objs, JavaThread::current());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   673
  VMThread::execute(&revoke);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   674
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   675
489c9b5090e2 Initial load
duke
parents:
diff changeset
   676
489c9b5090e2 Initial load
duke
parents:
diff changeset
   677
void BiasedLocking::revoke_at_safepoint(Handle h_obj) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   678
  assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   679
  oop obj = h_obj();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   680
  HeuristicsResult heuristics = update_heuristics(obj, false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   681
  if (heuristics == HR_SINGLE_REVOKE) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   682
    revoke_bias(obj, false, false, NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   683
  } else if ((heuristics == HR_BULK_REBIAS) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   684
             (heuristics == HR_BULK_REVOKE)) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   685
    bulk_revoke_or_rebias_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), false, NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   686
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   687
  clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   688
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   689
489c9b5090e2 Initial load
duke
parents:
diff changeset
   690
489c9b5090e2 Initial load
duke
parents:
diff changeset
   691
void BiasedLocking::revoke_at_safepoint(GrowableArray<Handle>* objs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   692
  assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   693
  int len = objs->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   694
  for (int i = 0; i < len; i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   695
    oop obj = (objs->at(i))();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   696
    HeuristicsResult heuristics = update_heuristics(obj, false);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   697
    if (heuristics == HR_SINGLE_REVOKE) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   698
      revoke_bias(obj, false, false, NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   699
    } else if ((heuristics == HR_BULK_REBIAS) ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   700
               (heuristics == HR_BULK_REVOKE)) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   701
      bulk_revoke_or_rebias_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), false, NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   702
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   703
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   704
  clean_up_cached_monitor_info();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   705
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   706
489c9b5090e2 Initial load
duke
parents:
diff changeset
   707
489c9b5090e2 Initial load
duke
parents:
diff changeset
   708
void BiasedLocking::preserve_marks() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   709
  if (!UseBiasedLocking)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   710
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   711
489c9b5090e2 Initial load
duke
parents:
diff changeset
   712
  assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   713
489c9b5090e2 Initial load
duke
parents:
diff changeset
   714
  assert(_preserved_oop_stack  == NULL, "double initialization");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   715
  assert(_preserved_mark_stack == NULL, "double initialization");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   716
489c9b5090e2 Initial load
duke
parents:
diff changeset
   717
  // In order to reduce the number of mark words preserved during GC
489c9b5090e2 Initial load
duke
parents:
diff changeset
   718
  // due to the presence of biased locking, we reinitialize most mark
489c9b5090e2 Initial load
duke
parents:
diff changeset
   719
  // words to the class's prototype during GC -- even those which have
489c9b5090e2 Initial load
duke
parents:
diff changeset
   720
  // a currently valid bias owner. One important situation where we
489c9b5090e2 Initial load
duke
parents:
diff changeset
   721
  // must not clobber a bias is when a biased object is currently
489c9b5090e2 Initial load
duke
parents:
diff changeset
   722
  // locked. To handle this case we iterate over the currently-locked
489c9b5090e2 Initial load
duke
parents:
diff changeset
   723
  // monitors in a prepass and, if they are biased, preserve their
489c9b5090e2 Initial load
duke
parents:
diff changeset
   724
  // mark words here. This should be a relatively small set of objects
489c9b5090e2 Initial load
duke
parents:
diff changeset
   725
  // especially compared to the number of objects in the heap.
13195
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 7397
diff changeset
   726
  _preserved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(10, true);
be27e1b6a4b9 6995781: Native Memory Tracking (Phase 1)
zgu
parents: 7397
diff changeset
   727
  _preserved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Handle>(10, true);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   728
489c9b5090e2 Initial load
duke
parents:
diff changeset
   729
  ResourceMark rm;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   730
  Thread* cur = Thread::current();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   731
  for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   732
    if (thread->has_last_Java_frame()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   733
      RegisterMap rm(thread);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   734
      for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   735
        GrowableArray<MonitorInfo*> *monitors = vf->monitors();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   736
        if (monitors != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   737
          int len = monitors->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   738
          // Walk monitors youngest to oldest
489c9b5090e2 Initial load
duke
parents:
diff changeset
   739
          for (int i = len - 1; i >= 0; i--) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   740
            MonitorInfo* mon_info = monitors->at(i);
3171
aa289b22b577 6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
kvn
parents: 1600
diff changeset
   741
            if (mon_info->owner_is_scalar_replaced()) continue;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   742
            oop owner = mon_info->owner();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   743
            if (owner != NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   744
              markOop mark = owner->mark();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   745
              if (mark->has_bias_pattern()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   746
                _preserved_oop_stack->push(Handle(cur, owner));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   747
                _preserved_mark_stack->push(mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   748
              }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   749
            }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   750
          }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   751
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   752
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   753
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   754
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   755
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   756
489c9b5090e2 Initial load
duke
parents:
diff changeset
   757
489c9b5090e2 Initial load
duke
parents:
diff changeset
   758
void BiasedLocking::restore_marks() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   759
  if (!UseBiasedLocking)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   760
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   761
489c9b5090e2 Initial load
duke
parents:
diff changeset
   762
  assert(_preserved_oop_stack  != NULL, "double free");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   763
  assert(_preserved_mark_stack != NULL, "double free");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   764
489c9b5090e2 Initial load
duke
parents:
diff changeset
   765
  int len = _preserved_oop_stack->length();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   766
  for (int i = 0; i < len; i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   767
    Handle owner = _preserved_oop_stack->at(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   768
    markOop mark = _preserved_mark_stack->at(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   769
    owner->set_mark(mark);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   770
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   771
489c9b5090e2 Initial load
duke
parents:
diff changeset
   772
  delete _preserved_oop_stack;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   773
  _preserved_oop_stack = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   774
  delete _preserved_mark_stack;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   775
  _preserved_mark_stack = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   776
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   777
489c9b5090e2 Initial load
duke
parents:
diff changeset
   778
489c9b5090e2 Initial load
duke
parents:
diff changeset
   779
int* BiasedLocking::total_entry_count_addr()                   { return _counters.total_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   780
int* BiasedLocking::biased_lock_entry_count_addr()             { return _counters.biased_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   781
int* BiasedLocking::anonymously_biased_lock_entry_count_addr() { return _counters.anonymously_biased_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   782
int* BiasedLocking::rebiased_lock_entry_count_addr()           { return _counters.rebiased_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   783
int* BiasedLocking::revoked_lock_entry_count_addr()            { return _counters.revoked_lock_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   784
int* BiasedLocking::fast_path_entry_count_addr()               { return _counters.fast_path_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   785
int* BiasedLocking::slow_path_entry_count_addr()               { return _counters.slow_path_entry_count_addr(); }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   786
489c9b5090e2 Initial load
duke
parents:
diff changeset
   787
489c9b5090e2 Initial load
duke
parents:
diff changeset
   788
// BiasedLockingCounters
489c9b5090e2 Initial load
duke
parents:
diff changeset
   789
489c9b5090e2 Initial load
duke
parents:
diff changeset
   790
int BiasedLockingCounters::slow_path_entry_count() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   791
  if (_slow_path_entry_count != 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   792
    return _slow_path_entry_count;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   793
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   794
  int sum = _biased_lock_entry_count   + _anonymously_biased_lock_entry_count +
489c9b5090e2 Initial load
duke
parents:
diff changeset
   795
            _rebiased_lock_entry_count + _revoked_lock_entry_count +
489c9b5090e2 Initial load
duke
parents:
diff changeset
   796
            _fast_path_entry_count;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   797
489c9b5090e2 Initial load
duke
parents:
diff changeset
   798
  return _total_entry_count - sum;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   799
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   800
489c9b5090e2 Initial load
duke
parents:
diff changeset
   801
void BiasedLockingCounters::print_on(outputStream* st) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   802
  tty->print_cr("# total entries: %d", _total_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   803
  tty->print_cr("# biased lock entries: %d", _biased_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   804
  tty->print_cr("# anonymously biased lock entries: %d", _anonymously_biased_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   805
  tty->print_cr("# rebiased lock entries: %d", _rebiased_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   806
  tty->print_cr("# revoked lock entries: %d", _revoked_lock_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   807
  tty->print_cr("# fast path lock entries: %d", _fast_path_entry_count);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   808
  tty->print_cr("# slow path lock entries: %d", slow_path_entry_count());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   809
}