1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/jfr/leakprofiler/leakProfiler.cpp Mon Aug 12 18:30:40 2019 +0300
1.3 @@ -0,0 +1,132 @@
1.4 +/*
1.5 + * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "jfr/leakprofiler/emitEventOperation.hpp"
1.30 +#include "jfr/leakprofiler/leakProfiler.hpp"
1.31 +#include "jfr/leakprofiler/startOperation.hpp"
1.32 +#include "jfr/leakprofiler/stopOperation.hpp"
1.33 +#include "jfr/leakprofiler/sampling/objectSampler.hpp"
1.34 +#include "jfr/recorder/service/jfrOptionSet.hpp"
1.35 +#include "memory/iterator.hpp"
1.36 +#include "oops/oop.hpp"
1.37 +#include "runtime/atomic.hpp"
1.38 +#include "runtime/orderAccess.hpp"
1.39 +#include "runtime/thread.inline.hpp"
1.40 +#include "runtime/vmThread.hpp"
1.41 +#include "utilities/ostream.hpp"
1.42 +
1.43 +// Only to be updated during safepoint
1.44 +ObjectSampler* LeakProfiler::_object_sampler = NULL;
1.45 +
1.46 +static volatile jbyte suspended = 0;
1.47 +bool LeakProfiler::start(jint sample_count) {
1.48 + if (_object_sampler != NULL) {
1.49 + // already started
1.50 + return true;
1.51 + }
1.52 + // Allows user to disable leak profiler on command line by setting queue size to zero.
1.53 + if (sample_count > 0) {
1.54 + StartOperation op(sample_count);
1.55 + VMThread::execute(&op);
1.56 + return _object_sampler != NULL;
1.57 + }
1.58 + return false;
1.59 +}
1.60 +
1.61 +bool LeakProfiler::stop() {
1.62 + if (_object_sampler == NULL) {
1.63 + // already stopped/not started
1.64 + return true;
1.65 + }
1.66 + StopOperation op;
1.67 + VMThread::execute(&op);
1.68 + return _object_sampler == NULL;
1.69 +}
1.70 +
1.71 +void LeakProfiler::emit_events(jlong cutoff_ticks, bool emit_all) {
1.72 + if (!is_running()) {
1.73 + return;
1.74 + }
1.75 + EmitEventOperation op(cutoff_ticks, emit_all);
1.76 + VMThread::execute(&op);
1.77 +}
1.78 +
1.79 +void LeakProfiler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
1.80 + assert(SafepointSynchronize::is_at_safepoint(),
1.81 + "Leak Profiler::oops_do(...) may only be called during safepoint");
1.82 +
1.83 + if (_object_sampler != NULL) {
1.84 + _object_sampler->oops_do(is_alive, f);
1.85 + }
1.86 +}
1.87 +
1.88 +void LeakProfiler::sample(HeapWord* object,
1.89 + size_t size,
1.90 + JavaThread* thread) {
1.91 + assert(is_running(), "invariant");
1.92 + assert(thread != NULL, "invariant");
1.93 + assert(thread->thread_state() == _thread_in_vm, "invariant");
1.94 +
1.95 + // exclude compiler threads and code sweeper thread
1.96 + if (thread->is_hidden_from_external_view()) {
1.97 + return;
1.98 + }
1.99 +
1.100 + _object_sampler->add(object, size, thread);
1.101 +}
1.102 +
1.103 +ObjectSampler* LeakProfiler::object_sampler() {
1.104 + assert(is_suspended() || SafepointSynchronize::is_at_safepoint(),
1.105 + "Leak Profiler::object_sampler() may only be called during safepoint");
1.106 + return _object_sampler;
1.107 +}
1.108 +
1.109 +void LeakProfiler::set_object_sampler(ObjectSampler* object_sampler) {
1.110 + assert(SafepointSynchronize::is_at_safepoint(),
1.111 + "Leak Profiler::set_object_sampler() may only be called during safepoint");
1.112 + _object_sampler = object_sampler;
1.113 +}
1.114 +
1.115 +bool LeakProfiler::is_running() {
1.116 + return _object_sampler != NULL && !suspended;
1.117 +}
1.118 +
1.119 +bool LeakProfiler::is_suspended() {
1.120 + return _object_sampler != NULL && suspended;
1.121 +}
1.122 +
1.123 +void LeakProfiler::resume() {
1.124 + assert(is_suspended(), "invariant");
1.125 + OrderAccess::storestore();
1.126 + Atomic::store((jbyte)0, &suspended);
1.127 + assert(is_running(), "invariant");
1.128 +}
1.129 +
1.130 +void LeakProfiler::suspend() {
1.131 + assert(SafepointSynchronize::is_at_safepoint(), "invariant");
1.132 + assert(_object_sampler != NULL, "invariant");
1.133 + assert(!is_suspended(), "invariant");
1.134 + suspended = (jbyte)1; // safepoint visible
1.135 +}
