author | chegar |
Thu, 17 Oct 2019 20:54:25 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
parent 58678 | 9cf78a70fa4f |
parent 58132 | caa25ab47aca |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 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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|
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#include "precompiled.hpp" |
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#include "gc/shared/collectedHeap.hpp" |
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#include "jfr/leakprofiler/leakProfiler.hpp" |
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#include "jfr/leakprofiler/chains/bfsClosure.hpp" |
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#include "jfr/leakprofiler/chains/bitset.inline.hpp" |
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#include "jfr/leakprofiler/chains/dfsClosure.hpp" |
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#include "jfr/leakprofiler/chains/edge.hpp" |
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#include "jfr/leakprofiler/chains/edgeQueue.hpp" |
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#include "jfr/leakprofiler/chains/edgeStore.hpp" |
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#include "jfr/leakprofiler/chains/objectSampleMarker.hpp" |
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#include "jfr/leakprofiler/chains/rootSetClosure.hpp" |
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#include "jfr/leakprofiler/chains/edgeStore.hpp" |
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#include "jfr/leakprofiler/chains/objectSampleMarker.hpp" |
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#include "jfr/leakprofiler/chains/pathToGcRootsOperation.hpp" |
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#include "jfr/leakprofiler/checkpoint/eventEmitter.hpp" |
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#include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.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/utilities/granularTimer.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/safepoint.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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|
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PathToGcRootsOperation::PathToGcRootsOperation(ObjectSampler* sampler, EdgeStore* edge_store, int64_t cutoff, bool emit_all) : |
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_sampler(sampler),_edge_store(edge_store), _cutoff_ticks(cutoff), _emit_all(emit_all) {} |
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|
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/* The EdgeQueue is backed by directly managed virtual memory. |
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* We will attempt to dimension an initial reservation |
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* in proportion to the size of the heap (represented by heap_region). |
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* Initial memory reservation: 5% of the heap OR at least 32 Mb |
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* Commit ratio: 1 : 10 (subject to allocation granularties) |
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*/ |
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static size_t edge_queue_memory_reservation() { |
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const size_t memory_reservation_bytes = MAX2(MaxHeapSize / 20, 32*M); |
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assert(memory_reservation_bytes >= (size_t)32*M, "invariant"); |
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return memory_reservation_bytes; |
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} |
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static size_t edge_queue_memory_commit_size(size_t memory_reservation_bytes) { |
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const size_t memory_commit_block_size_bytes = memory_reservation_bytes / 10; |
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assert(memory_commit_block_size_bytes >= (size_t)3*M, "invariant"); |
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return memory_commit_block_size_bytes; |
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} |
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|
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static void log_edge_queue_summary(const EdgeQueue& edge_queue) { |
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log_trace(jfr, system)("EdgeQueue reserved size total: " SIZE_FORMAT " [KB]", edge_queue.reserved_size() / K); |
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log_trace(jfr, system)("EdgeQueue edges total: " SIZE_FORMAT, edge_queue.top()); |
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log_trace(jfr, system)("EdgeQueue liveset total: " SIZE_FORMAT " [KB]", edge_queue.live_set() / K); |
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if (edge_queue.reserved_size() > 0) { |
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log_trace(jfr, system)("EdgeQueue commit reserve ratio: %f\n", |
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((double)edge_queue.live_set() / (double)edge_queue.reserved_size())); |
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} |
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} |
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void PathToGcRootsOperation::doit() { |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(_cutoff_ticks > 0, "invariant"); |
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// The bitset used for marking is dimensioned as a function of the heap size |
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BitSet mark_bits; |
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|
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// The edge queue is dimensioned as a fraction of the heap size |
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const size_t edge_queue_reservation_size = edge_queue_memory_reservation(); |
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EdgeQueue edge_queue(edge_queue_reservation_size, edge_queue_memory_commit_size(edge_queue_reservation_size)); |
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// The initialize() routines will attempt to reserve and allocate backing storage memory. |
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// Failure to accommodate will render root chain processing impossible. |
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// As a fallback on failure, just write out the existing samples, flat, without chains. |
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if (!edge_queue.initialize()) { |
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log_warning(jfr)("Unable to allocate memory for root chain processing"); |
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return; |
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} |
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// Save the original markWord for the potential leak objects, |
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// to be restored on function exit |
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ObjectSampleMarker marker; |
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if (ObjectSampleCheckpoint::save_mark_words(_sampler, marker, _emit_all) == 0) { |
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// no valid samples to process |
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return; |
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} |
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|
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// Necessary condition for attempting a root set iteration |
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Universe::heap()->ensure_parsability(false); |
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|
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BFSClosure bfs(&edge_queue, _edge_store, &mark_bits); |
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RootSetClosure<BFSClosure> roots(&bfs); |
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GranularTimer::start(_cutoff_ticks, 1000000); |
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roots.process(); |
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if (edge_queue.is_full()) { |
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// Pathological case where roots don't fit in queue |
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// Do a depth-first search, but mark roots first |
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// to avoid walking sideways over roots |
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DFSClosure::find_leaks_from_root_set(_edge_store, &mark_bits); |
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} else { |
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bfs.process(); |
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} |
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GranularTimer::stop(); |
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log_edge_queue_summary(edge_queue); |
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|
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// Emit old objects including their reference chains as events |
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EventEmitter emitter(GranularTimer::start_time(), GranularTimer::end_time()); |
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emitter.write_events(_sampler, _edge_store, _emit_all); |
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} |