author | stefank |
Mon, 25 Nov 2019 12:33:15 +0100 | |
changeset 59252 | 623722a6aeb9 |
parent 58863 | c16ac7a2eba4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2019, 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 "jfr/jfrEvents.hpp" |
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#include "jfr/leakprofiler/sampling/objectSample.hpp" |
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#include "jfr/leakprofiler/sampling/objectSampler.hpp" |
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#include "jfr/leakprofiler/sampling/sampleList.hpp" |
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#include "jfr/leakprofiler/sampling/samplePriorityQueue.hpp" |
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#include "jfr/recorder/jfrEventSetting.inline.hpp" |
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#include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp" |
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#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp" |
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#include "jfr/support/jfrThreadLocal.hpp" |
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#include "jfr/utilities/jfrTryLock.hpp" |
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#include "logging/log.hpp" |
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#include "memory/universe.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/orderAccess.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "runtime/thread.hpp" |
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static ObjectSampler* _instance = NULL; |
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static ObjectSampler& instance() { |
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assert(_instance != NULL, "invariant"); |
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return *_instance; |
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} |
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ObjectSampler::ObjectSampler(size_t size) : |
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_priority_queue(new SamplePriorityQueue(size)), |
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_list(new SampleList(size)), |
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_last_sweep(JfrTicks::now()), |
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_total_allocated(0), |
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_threshold(0), |
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_size(size), |
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_dead_samples(false) {} |
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ObjectSampler::~ObjectSampler() { |
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delete _priority_queue; |
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_priority_queue = NULL; |
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delete _list; |
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_list = NULL; |
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} |
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||
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bool ObjectSampler::create(size_t size) { |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(_instance == NULL, "invariant"); |
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_instance = new ObjectSampler(size); |
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return _instance != NULL; |
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} |
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bool ObjectSampler::is_created() { |
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return _instance != NULL; |
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} |
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ObjectSampler* ObjectSampler::sampler() { |
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assert(is_created(), "invariant"); |
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return _instance; |
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} |
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void ObjectSampler::destroy() { |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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if (_instance != NULL) { |
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ObjectSampler* const sampler = _instance; |
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_instance = NULL; |
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delete sampler; |
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} |
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} |
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static volatile int _lock = 0; |
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ObjectSampler* ObjectSampler::acquire() { |
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assert(is_created(), "invariant"); |
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while (Atomic::cmpxchg(&_lock, 0, 1) == 1) {} |
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return _instance; |
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} |
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void ObjectSampler::release() { |
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assert(is_created(), "invariant"); |
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OrderAccess::fence(); |
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_lock = 0; |
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} |
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static traceid get_thread_id(JavaThread* thread) { |
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assert(thread != NULL, "invariant"); |
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if (thread->threadObj() == NULL) { |
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return 0; |
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} |
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const JfrThreadLocal* const tl = thread->jfr_thread_local(); |
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assert(tl != NULL, "invariant"); |
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if (tl->is_excluded()) { |
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return 0; |
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} |
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if (!tl->has_thread_blob()) { |
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JfrCheckpointManager::create_thread_blob(thread); |
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} |
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assert(tl->has_thread_blob(), "invariant"); |
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return tl->thread_id(); |
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} |
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static void record_stacktrace(JavaThread* thread) { |
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assert(thread != NULL, "invariant"); |
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if (JfrEventSetting::has_stacktrace(EventOldObjectSample::eventId)) { |
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JfrStackTraceRepository::record_and_cache(thread); |
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} |
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} |
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void ObjectSampler::sample(HeapWord* obj, size_t allocated, JavaThread* thread) { |
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assert(thread != NULL, "invariant"); |
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assert(is_created(), "invariant"); |
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const traceid thread_id = get_thread_id(thread); |
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if (thread_id == 0) { |
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return; |
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} |
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record_stacktrace(thread); |
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// try enter critical section |
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JfrTryLock tryLock(&_lock); |
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if (!tryLock.has_lock()) { |
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log_trace(jfr, oldobject, sampling)("Skipping old object sample due to lock contention"); |
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return; |
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} |
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instance().add(obj, allocated, thread_id, thread); |
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} |
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void ObjectSampler::add(HeapWord* obj, size_t allocated, traceid thread_id, JavaThread* thread) { |
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assert(obj != NULL, "invariant"); |
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assert(thread_id != 0, "invariant"); |
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assert(thread != NULL, "invariant"); |
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assert(thread->jfr_thread_local()->has_thread_blob(), "invariant"); |
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if (_dead_samples) { |
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scavenge(); |
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assert(!_dead_samples, "invariant"); |
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} |
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_total_allocated += allocated; |
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const size_t span = _total_allocated - _priority_queue->total(); |
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ObjectSample* sample; |
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if ((size_t)_priority_queue->count() == _size) { |
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assert(_list->count() == _size, "invariant"); |
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const ObjectSample* peek = _priority_queue->peek(); |
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if (peek->span() > span) { |
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// quick reject, will not fit |
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return; |
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} |
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sample = _list->reuse(_priority_queue->pop()); |
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} else { |
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sample = _list->get(); |
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} |
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assert(sample != NULL, "invariant"); |
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sample->set_thread_id(thread_id); |
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const JfrThreadLocal* const tl = thread->jfr_thread_local(); |
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sample->set_thread(tl->thread_blob()); |
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const unsigned int stacktrace_hash = tl->cached_stack_trace_hash(); |
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if (stacktrace_hash != 0) { |
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sample->set_stack_trace_id(tl->cached_stack_trace_id()); |
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sample->set_stack_trace_hash(stacktrace_hash); |
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} |
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sample->set_span(allocated); |
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sample->set_object((oop)obj); |
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sample->set_allocated(allocated); |
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sample->set_allocation_time(JfrTicks::now()); |
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sample->set_heap_used_at_last_gc(Universe::get_heap_used_at_last_gc()); |
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_priority_queue->push(sample); |
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} |
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void ObjectSampler::scavenge() { |
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ObjectSample* current = _list->last(); |
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while (current != NULL) { |
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ObjectSample* next = current->next(); |
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if (current->is_dead()) { |
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remove_dead(current); |
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} |
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current = next; |
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} |
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_dead_samples = false; |
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} |
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void ObjectSampler::remove_dead(ObjectSample* sample) { |
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assert(sample != NULL, "invariant"); |
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assert(sample->is_dead(), "invariant"); |
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ObjectSample* const previous = sample->prev(); |
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// push span on to previous |
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if (previous != NULL) { |
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_priority_queue->remove(previous); |
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previous->add_span(sample->span()); |
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_priority_queue->push(previous); |
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} |
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_priority_queue->remove(sample); |
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_list->release(sample); |
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} |
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void ObjectSampler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
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assert(is_created(), "invariant"); |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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ObjectSampler& sampler = instance(); |
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ObjectSample* current = sampler._list->last(); |
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while (current != NULL) { |
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ObjectSample* next = current->next(); |
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if (!current->is_dead()) { |
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if (is_alive->do_object_b(current->object())) { |
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// The weakly referenced object is alive, update pointer |
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f->do_oop(const_cast<oop*>(current->object_addr())); |
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} else { |
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current->set_dead(); |
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sampler._dead_samples = true; |
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} |
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} |
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current = next; |
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} |
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sampler._last_sweep = JfrTicks::now(); |
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} |
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ObjectSample* ObjectSampler::last() const { |
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return _list->last(); |
242 |
} |
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243 |
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const ObjectSample* ObjectSampler::first() const { |
245 |
return _list->first(); |
|
246 |
} |
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247 |
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const ObjectSample* ObjectSampler::last_resolved() const { |
249 |
return _list->last_resolved(); |
|
250 |
} |
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251 |
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void ObjectSampler::set_last_resolved(const ObjectSample* sample) { |
|
253 |
_list->set_last_resolved(sample); |
|
254 |
} |
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255 |
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int ObjectSampler::item_count() const { |
|
257 |
return _priority_queue->count(); |
|
258 |
} |
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259 |
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const ObjectSample* ObjectSampler::item_at(int index) const { |
|
261 |
return _priority_queue->item_at(index); |
|
262 |
} |
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263 |
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264 |
ObjectSample* ObjectSampler::item_at(int index) { |
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265 |
return const_cast<ObjectSample*>( |
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266 |
const_cast<const ObjectSampler*>(this)->item_at(index) |
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); |
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} |
269 |
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const JfrTicks& ObjectSampler::last_sweep() const { |
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271 |
return _last_sweep; |
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272 |
} |