--- /dev/null 2019-02-13 16:01:02.292000000 +0300 +++ new/src/share/vm/jfr/leakprofiler/sampling/objectSampler.cpp 2019-02-15 19:03:06.985801779 +0300 @@ -0,0 +1,192 @@ +/* + * 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/jfrEvents.hpp" +#include "jfr/leakprofiler/sampling/objectSample.hpp" +#include "jfr/leakprofiler/sampling/objectSampler.hpp" +#include "jfr/leakprofiler/sampling/sampleList.hpp" +#include "jfr/leakprofiler/sampling/samplePriorityQueue.hpp" +#include "jfr/recorder/jfrEventSetting.inline.hpp" +#include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp" +#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp" +#include "jfr/support/jfrThreadLocal.hpp" +#include "jfr/utilities/jfrTryLock.hpp" +#include "memory/universe.hpp" +#include "oops/oop.inline.hpp" +#include "runtime/thread.hpp" + +ObjectSampler::ObjectSampler(size_t size) : + _priority_queue(new SamplePriorityQueue(size)), + _list(new SampleList(size)), + _last_sweep(JfrTicks::now()), + _total_allocated(0), + _threshold(0), + _size(size), + _tryLock(0), + _dead_samples(false) {} + +ObjectSampler::~ObjectSampler() { + delete _priority_queue; + _priority_queue = NULL; + delete _list; + _list = NULL; +} + +void ObjectSampler::add(HeapWord* obj, size_t allocated, JavaThread* thread) { + assert(thread != NULL, "invariant"); + const traceid thread_id = thread->threadObj() != NULL ? thread->jfr_thread_local()->thread_id() : 0; + if (thread_id == 0) { + return; + } + assert(thread_id != 0, "invariant"); + + if (!thread->jfr_thread_local()->has_thread_checkpoint()) { + JfrCheckpointManager::create_thread_checkpoint(thread); + assert(thread->jfr_thread_local()->has_thread_checkpoint(), "invariant"); + } + + traceid stack_trace_id = 0; + unsigned int stack_trace_hash = 0; + if (JfrEventSetting::has_stacktrace(EventOldObjectSample::eventId)) { + stack_trace_id = JfrStackTraceRepository::record(thread, 0, &stack_trace_hash); + thread->jfr_thread_local()->set_cached_stack_trace_id(stack_trace_id, stack_trace_hash); + } + + JfrTryLock tryLock(&_tryLock); + if (!tryLock.has_lock()) { + if (LogJFR && Verbose) tty->print_cr("Skipping old object sample due to lock contention"); + return; + } + + if (_dead_samples) { + scavenge(); + assert(!_dead_samples, "invariant"); + } + + _total_allocated += allocated; + const size_t span = _total_allocated - _priority_queue->total(); + ObjectSample* sample; + if ((size_t)_priority_queue->count() == _size) { + assert(_list->count() == _size, "invariant"); + const ObjectSample* peek = _priority_queue->peek(); + if (peek->span() > span) { + // quick reject, will not fit + return; + } + sample = _list->reuse(_priority_queue->pop()); + } else { + sample = _list->get(); + } + + assert(sample != NULL, "invariant"); + assert(thread_id != 0, "invariant"); + sample->set_thread_id(thread_id); + sample->set_thread_checkpoint(thread->jfr_thread_local()->thread_checkpoint()); + + if (stack_trace_id != 0) { + sample->set_stack_trace_id(stack_trace_id); + sample->set_stack_trace_hash(stack_trace_hash); + } + + sample->set_span(allocated); + sample->set_object((oop)obj); + sample->set_allocated(allocated); + sample->set_allocation_time(JfrTicks::now()); + sample->set_heap_used_at_last_gc(Universe::get_heap_used_at_last_gc()); + _priority_queue->push(sample); +} + +const ObjectSample* ObjectSampler::last() const { + return _list->last(); +} + +const ObjectSample* ObjectSampler::last_resolved() const { + return _list->last_resolved(); +} + +void ObjectSampler::set_last_resolved(const ObjectSample* sample) { + _list->set_last_resolved(sample); +} + +void ObjectSampler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) { + ObjectSample* current = _list->last(); + while (current != NULL) { + ObjectSample* next = current->next(); + if (!current->is_dead()) { + if (is_alive->do_object_b(current->object())) { + // The weakly referenced object is alive, update pointer + f->do_oop(const_cast(current->object_addr())); + } else { + current->set_dead(); + _dead_samples = true; + } + } + current = next; + } + _last_sweep = JfrTicks::now(); +} + +void ObjectSampler::remove_dead(ObjectSample* sample) { + assert(sample != NULL, "invariant"); + assert(sample->is_dead(), "invariant"); + ObjectSample* const previous = sample->prev(); + // push span on to previous + if (previous != NULL) { + _priority_queue->remove(previous); + previous->add_span(sample->span()); + _priority_queue->push(previous); + } + _priority_queue->remove(sample); + _list->release(sample); +} + +void ObjectSampler::scavenge() { + ObjectSample* current = _list->last(); + while (current != NULL) { + ObjectSample* next = current->next(); + if (current->is_dead()) { + remove_dead(current); + } + current = next; + } + _dead_samples = false; +} + +int ObjectSampler::item_count() const { + return _priority_queue->count(); +} + +const ObjectSample* ObjectSampler::item_at(int index) const { + return _priority_queue->item_at(index); +} + +ObjectSample* ObjectSampler::item_at(int index) { + return const_cast( + const_cast(this)->item_at(index) + ); +} + +const JfrTicks& ObjectSampler::last_sweep() const { + return _last_sweep; +}