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68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, 2026, 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_G1UNCOMMITREGIONTASK_HPP
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#define SHARE_GC_G1_G1UNCOMMITREGIONTASK_HPP
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#include "gc/g1/g1ServiceThread.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ticks.hpp"
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class G1UncommitRegionTask : public G1ServiceTask {
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// Each execution of the uncommit task is limited to uncommit at most 128M.
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// This limit is small enough to ensure that the duration of each invocation
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// is short, while still making reasonable progress.
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static const uint UncommitSizeLimit = 128 * M;
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// The delay between two uncommit task executions.
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static const uint UncommitTaskDelayMs = 10;
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static G1UncommitRegionTask* _instance;
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static void initialize();
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static G1UncommitRegionTask* instance();
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// The _active state is used to prevent the task from being enqueued on the
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// service thread multiple times. If the task is active, a new request to
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// enqueue it will be ignored.
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bool _active;
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// Members to keep a summary of the current concurrent uncommit
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// work. Used for printing when no more work is available.
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Tickspan _summary_duration;
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uint _summary_region_count;
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G1UncommitRegionTask();
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bool is_active();
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void set_active(bool state);
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void report_execution(Tickspan time, uint regions);
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void report_summary();
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void clear_summary();
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public:
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static void enqueue();
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virtual void execute();
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};
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#endif
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