Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "jfr/leakprofiler/emitEventOperation.hpp"

 #include "jfr/leakprofiler/leakProfiler.hpp"

 #include "jfr/leakprofiler/startOperation.hpp"

 #include "jfr/leakprofiler/stopOperation.hpp"

 #include "jfr/leakprofiler/sampling/objectSampler.hpp"

 #include "jfr/recorder/service/jfrOptionSet.hpp"

 #include "memory/iterator.hpp"

 #include "oops/oop.hpp"

 #include "runtime/atomic.hpp"

 #include "runtime/orderAccess.hpp"

 #include "runtime/thread.inline.hpp"

 #include "runtime/vmThread.hpp"

 #include "utilities/ostream.hpp"

 // Only to be updated during safepoint

 ObjectSampler* LeakProfiler::_object_sampler = NULL;

 static volatile jbyte suspended = 0;

 bool LeakProfiler::start(jint sample_count) {

   if (_object_sampler != NULL) {

     // already started

     return true;

   }

   // Allows user to disable leak profiler on command line by setting queue size to zero.

   if (sample_count > 0) {

     StartOperation op(sample_count);

     VMThread::execute(&op);

     return _object_sampler != NULL;

   }

   return false;

 }

 bool LeakProfiler::stop() {

   if (_object_sampler == NULL) {

     // already stopped/not started

     return true;

   }

   StopOperation op;

   VMThread::execute(&op);

   return _object_sampler == NULL;

 }

 void LeakProfiler::emit_events(jlong cutoff_ticks, bool emit_all) {

   if (!is_running()) {

     return;

   }

   EmitEventOperation op(cutoff_ticks, emit_all);

   VMThread::execute(&op);

 }

 void LeakProfiler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {

   assert(SafepointSynchronize::is_at_safepoint(),

     "Leak Profiler::oops_do(...) may only be called during safepoint");

   if (_object_sampler != NULL) {

     _object_sampler->oops_do(is_alive, f);

   }

 }

 void LeakProfiler::sample(HeapWord* object,

                           size_t size,

                           JavaThread* thread) {

   assert(is_running(), "invariant");

   assert(thread != NULL, "invariant");

   assert(thread->thread_state() == _thread_in_vm, "invariant");

   // exclude compiler threads and code sweeper thread

   if (thread->is_hidden_from_external_view()) {

     return;

   }

   _object_sampler->add(object, size, thread);

 }

 ObjectSampler* LeakProfiler::object_sampler() {

   assert(is_suspended() || SafepointSynchronize::is_at_safepoint(),

     "Leak Profiler::object_sampler() may only be called during safepoint");

   return _object_sampler;

 }

 void LeakProfiler::set_object_sampler(ObjectSampler* object_sampler) {

   assert(SafepointSynchronize::is_at_safepoint(),

     "Leak Profiler::set_object_sampler() may only be called during safepoint");

   _object_sampler = object_sampler;

 }

 bool LeakProfiler::is_running() {

   return _object_sampler != NULL && !suspended;

 }

 bool LeakProfiler::is_suspended() {

   return _object_sampler != NULL && suspended;

 }

 void LeakProfiler::resume() {

   assert(is_suspended(), "invariant");

   OrderAccess::storestore();

   Atomic::store((jbyte)0, &suspended);

   assert(is_running(), "invariant");

 }

 void LeakProfiler::suspend() {

   assert(SafepointSynchronize::is_at_safepoint(), "invariant");

   assert(_object_sampler != NULL, "invariant");

   assert(!is_suspended(), "invariant");

   suspended = (jbyte)1; // safepoint visible

 }