1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/jfr/leakprofiler/sampling/objectSampler.cpp Mon Aug 12 18:30:40 2019 +0300
1.3 @@ -0,0 +1,192 @@
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 +#include "precompiled.hpp"
1.28 +#include "jfr/jfrEvents.hpp"
1.29 +#include "jfr/leakprofiler/sampling/objectSample.hpp"
1.30 +#include "jfr/leakprofiler/sampling/objectSampler.hpp"
1.31 +#include "jfr/leakprofiler/sampling/sampleList.hpp"
1.32 +#include "jfr/leakprofiler/sampling/samplePriorityQueue.hpp"
1.33 +#include "jfr/recorder/jfrEventSetting.inline.hpp"
1.34 +#include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
1.35 +#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
1.36 +#include "jfr/support/jfrThreadLocal.hpp"
1.37 +#include "jfr/utilities/jfrTryLock.hpp"
1.38 +#include "memory/universe.hpp"
1.39 +#include "oops/oop.inline.hpp"
1.40 +#include "runtime/thread.hpp"
1.41 +
1.42 +ObjectSampler::ObjectSampler(size_t size) :
1.43 + _priority_queue(new SamplePriorityQueue(size)),
1.44 + _list(new SampleList(size)),
1.45 + _last_sweep(JfrTicks::now()),
1.46 + _total_allocated(0),
1.47 + _threshold(0),
1.48 + _size(size),
1.49 + _tryLock(0),
1.50 + _dead_samples(false) {}
1.51 +
1.52 +ObjectSampler::~ObjectSampler() {
1.53 + delete _priority_queue;
1.54 + _priority_queue = NULL;
1.55 + delete _list;
1.56 + _list = NULL;
1.57 +}
1.58 +
1.59 +void ObjectSampler::add(HeapWord* obj, size_t allocated, JavaThread* thread) {
1.60 + assert(thread != NULL, "invariant");
1.61 + const traceid thread_id = thread->threadObj() != NULL ? thread->jfr_thread_local()->thread_id() : 0;
1.62 + if (thread_id == 0) {
1.63 + return;
1.64 + }
1.65 + assert(thread_id != 0, "invariant");
1.66 +
1.67 + if (!thread->jfr_thread_local()->has_thread_checkpoint()) {
1.68 + JfrCheckpointManager::create_thread_checkpoint(thread);
1.69 + assert(thread->jfr_thread_local()->has_thread_checkpoint(), "invariant");
1.70 + }
1.71 +
1.72 + traceid stack_trace_id = 0;
1.73 + unsigned int stack_trace_hash = 0;
1.74 + if (JfrEventSetting::has_stacktrace(EventOldObjectSample::eventId)) {
1.75 + stack_trace_id = JfrStackTraceRepository::record(thread, 0, &stack_trace_hash);
1.76 + thread->jfr_thread_local()->set_cached_stack_trace_id(stack_trace_id, stack_trace_hash);
1.77 + }
1.78 +
1.79 + JfrTryLock tryLock(&_tryLock);
1.80 + if (!tryLock.has_lock()) {
1.81 + if (LogJFR && Verbose) tty->print_cr("Skipping old object sample due to lock contention");
1.82 + return;
1.83 + }
1.84 +
1.85 + if (_dead_samples) {
1.86 + scavenge();
1.87 + assert(!_dead_samples, "invariant");
1.88 + }
1.89 +
1.90 + _total_allocated += allocated;
1.91 + const size_t span = _total_allocated - _priority_queue->total();
1.92 + ObjectSample* sample;
1.93 + if ((size_t)_priority_queue->count() == _size) {
1.94 + assert(_list->count() == _size, "invariant");
1.95 + const ObjectSample* peek = _priority_queue->peek();
1.96 + if (peek->span() > span) {
1.97 + // quick reject, will not fit
1.98 + return;
1.99 + }
1.100 + sample = _list->reuse(_priority_queue->pop());
1.101 + } else {
1.102 + sample = _list->get();
1.103 + }
1.104 +
1.105 + assert(sample != NULL, "invariant");
1.106 + assert(thread_id != 0, "invariant");
1.107 + sample->set_thread_id(thread_id);
1.108 + sample->set_thread_checkpoint(thread->jfr_thread_local()->thread_checkpoint());
1.109 +
1.110 + if (stack_trace_id != 0) {
1.111 + sample->set_stack_trace_id(stack_trace_id);
1.112 + sample->set_stack_trace_hash(stack_trace_hash);
1.113 + }
1.114 +
1.115 + sample->set_span(allocated);
1.116 + sample->set_object((oop)obj);
1.117 + sample->set_allocated(allocated);
1.118 + sample->set_allocation_time(JfrTicks::now());
1.119 + sample->set_heap_used_at_last_gc(Universe::get_heap_used_at_last_gc());
1.120 + _priority_queue->push(sample);
1.121 +}
1.122 +
1.123 +const ObjectSample* ObjectSampler::last() const {
1.124 + return _list->last();
1.125 +}
1.126 +
1.127 +const ObjectSample* ObjectSampler::last_resolved() const {
1.128 + return _list->last_resolved();
1.129 +}
1.130 +
1.131 +void ObjectSampler::set_last_resolved(const ObjectSample* sample) {
1.132 + _list->set_last_resolved(sample);
1.133 +}
1.134 +
1.135 +void ObjectSampler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
1.136 + ObjectSample* current = _list->last();
1.137 + while (current != NULL) {
1.138 + ObjectSample* next = current->next();
1.139 + if (!current->is_dead()) {
1.140 + if (is_alive->do_object_b(current->object())) {
1.141 + // The weakly referenced object is alive, update pointer
1.142 + f->do_oop(const_cast<oop*>(current->object_addr()));
1.143 + } else {
1.144 + current->set_dead();
1.145 + _dead_samples = true;
1.146 + }
1.147 + }
1.148 + current = next;
1.149 + }
1.150 + _last_sweep = JfrTicks::now();
1.151 +}
1.152 +
1.153 +void ObjectSampler::remove_dead(ObjectSample* sample) {
1.154 + assert(sample != NULL, "invariant");
1.155 + assert(sample->is_dead(), "invariant");
1.156 + ObjectSample* const previous = sample->prev();
1.157 + // push span on to previous
1.158 + if (previous != NULL) {
1.159 + _priority_queue->remove(previous);
1.160 + previous->add_span(sample->span());
1.161 + _priority_queue->push(previous);
1.162 + }
1.163 + _priority_queue->remove(sample);
1.164 + _list->release(sample);
1.165 +}
1.166 +
1.167 +void ObjectSampler::scavenge() {
1.168 + ObjectSample* current = _list->last();
1.169 + while (current != NULL) {
1.170 + ObjectSample* next = current->next();
1.171 + if (current->is_dead()) {
1.172 + remove_dead(current);
1.173 + }
1.174 + current = next;
1.175 + }
1.176 + _dead_samples = false;
1.177 +}
1.178 +
1.179 +int ObjectSampler::item_count() const {
1.180 + return _priority_queue->count();
1.181 +}
1.182 +
1.183 +const ObjectSample* ObjectSampler::item_at(int index) const {
1.184 + return _priority_queue->item_at(index);
1.185 +}
1.186 +
1.187 +ObjectSample* ObjectSampler::item_at(int index) {
1.188 + return const_cast<ObjectSample*>(
1.189 + const_cast<const ObjectSampler*>(this)->item_at(index)
1.190 + );
1.191 +}
1.192 +
1.193 +const JfrTicks& ObjectSampler::last_sweep() const {
1.194 + return _last_sweep;
1.195 +}
