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