1 /* 2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP 26 #define SHARE_VM_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP 27 28 #include "utilities/globalDefinitions.hpp" 29 #include "utilities/debug.hpp" 30 31 // Used to track time from the end of initial mark to the first mixed GC. 32 // After calling the initial mark/mixed gc notifications, the result can be 33 // obtained in last_marking_time() once, after which the tracking resets. 34 // Any pauses recorded by add_pause() will be subtracted from that results. 35 class G1InitialMarkToMixedTimeTracker VALUE_OBJ_CLASS_SPEC { 36 private: 37 bool _active; 38 double _initial_mark_end_time; 39 double _mixed_start_time; 40 double _total_pause_time; 41 42 double wall_time() const { 43 return _mixed_start_time - _initial_mark_end_time; 44 } 45 public: 46 G1InitialMarkToMixedTimeTracker() { reset(); } 47 48 // Record initial mark pause end, starting the time tracking. 49 void record_initial_mark_end(double end_time) { 50 assert(!_active, "Initial mark out of order."); 51 _initial_mark_end_time = end_time; 52 _active = true; 53 } 54 55 // Record the first mixed gc pause start, ending the time tracking. 56 void record_mixed_gc_start(double start_time) { 57 if (_active) { 58 _mixed_start_time = start_time; 59 _active = false; 60 } 61 } 62 63 double last_marking_time() { 64 assert(has_result(), "Do not have all measurements yet."); 65 double result = (_mixed_start_time - _initial_mark_end_time) - _total_pause_time; 66 reset(); 67 return result; 68 } 69 70 void reset() { 71 _active = false; 72 _total_pause_time = 0.0; 73 _initial_mark_end_time = -1.0; 74 _mixed_start_time = -1.0; 75 } 76 77 void add_pause(double time) { 78 if (_active) { 79 _total_pause_time += time; 80 } 81 } 82 83 // Returns whether we have a result that can be retrieved. 84 bool has_result() const { return _mixed_start_time > 0.0 && _initial_mark_end_time > 0.0; } 85 }; 86 87 #endif // SHARE_VM_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP