hotspot/src/share/vm/gc/g1/g1InitialMarkToMixedTimeTracker.hpp
author tschatzl
Tue, 24 Nov 2015 10:22:36 +0100
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8136681: Factor out IHOP calculation from G1CollectorPolicy Summary: Move out existing IHOP value calculation into an implementation of a new interface called G1IHOPControl. Prepare for changes to accomodate adaptive IHOP implementation. Reviewed-by: jmasa, mgerdin, ehelin
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/*
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 * Copyright (c) 2001, 2015, 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_VM_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP
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#define SHARE_VM_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/debug.hpp"
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// Used to track time from the end of initial mark to the first mixed GC.
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// After calling the initial mark/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 G1InitialMarkToMixedTimeTracker VALUE_OBJ_CLASS_SPEC {
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private:
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  bool _active;
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  double _initial_mark_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 - _initial_mark_end_time;
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  }
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public:
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  G1InitialMarkToMixedTimeTracker() { reset(); }
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  // Record initial mark pause end, starting the time tracking.
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  void record_initial_mark_end(double end_time) {
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    assert(!_active, "Initial mark out of order.");
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    _initial_mark_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 - _initial_mark_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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    _initial_mark_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 && _initial_mark_end_time > 0.0; }
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};
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#endif // SHARE_VM_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP