88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
/*
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* Copyright (c) 2001, 2020, 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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#ifndef SHARE_GC_G1_G1CONCURRENTSTARTTOMIXEDTIMETRACKER_HPP
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#define SHARE_GC_G1_G1CONCURRENTSTARTTOMIXEDTIMETRACKER_HPP
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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// Used to track time from the end of concurrent start to the first mixed GC.
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// After calling the concurrent start/mixed gc notifications, the result can be
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// obtained in last_marking_time() once, after which the tracking resets.
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// Any pauses recorded by add_pause() will be subtracted from that results.
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class G1ConcurrentStartToMixedTimeTracker {
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private:
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bool _active;
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double _concurrent_start_end_time;
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double _mixed_start_time;
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double _total_pause_time;
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double wall_time() const {
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return _mixed_start_time - _concurrent_start_end_time;
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}
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public:
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G1ConcurrentStartToMixedTimeTracker() { reset(); }
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// Record concurrent start pause end, starting the time tracking.
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void record_concurrent_start_end(double end_time) {
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assert(!_active, "Concurrent start out of order.");
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_concurrent_start_end_time = end_time;
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_active = true;
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}
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// Record the first mixed gc pause start, ending the time tracking.
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void record_mixed_gc_start(double start_time) {
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if (_active) {
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_mixed_start_time = start_time;
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_active = false;
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}
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}
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double last_marking_time() {
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assert(has_result(), "Do not have all measurements yet.");
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double result = (_mixed_start_time - _concurrent_start_end_time) - _total_pause_time;
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reset();
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return result;
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}
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void reset() {
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_active = false;
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_total_pause_time = 0.0;
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_concurrent_start_end_time = -1.0;
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_mixed_start_time = -1.0;
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}
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void add_pause(double time) {
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if (_active) {
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_total_pause_time += time;
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}
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}
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// Returns whether we have a result that can be retrieved.
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bool has_result() const { return _mixed_start_time > 0.0 && _concurrent_start_end_time > 0.0; }
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};
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#endif // SHARE_GC_G1_G1CONCURRENTSTARTTOMIXEDTIMETRACKER_HPP
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