jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1MMUTracker.hpp@035d2e036a9b

6885041: G1: inconsistent thread dump
Summary: When G1 is enabled, thread dumps are inconsistent as the info for some of the G1 threads is not formatted properly.
Reviewed-by: ysr, johnc

     1 /*

     2  * Copyright 2001-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // Keeps track of the GC work and decides when it is OK to do GC work

    26 // and for how long so that the MMU invariants are maintained.

    28 /***** ALL TIMES ARE IN SECS!!!!!!! *****/

    30 // this is the "interface"

    31 class G1MMUTracker: public CHeapObj {

    32 protected:

    33   double          _time_slice;

    34   double          _max_gc_time; // this is per time slice

    36 public:

    37   G1MMUTracker(double time_slice, double max_gc_time);

    39   virtual void add_pause(double start, double end, bool gc_thread) = 0;

    40   virtual double longest_pause(double current_time) = 0;

    41   virtual double when_sec(double current_time, double pause_time) = 0;

    43   double max_gc_time() {

    44     return _max_gc_time;

    45   }

    47   inline bool now_max_gc(double current_time) {

    48     return when_sec(current_time, max_gc_time()) < 0.00001;

    49   }

    51   inline double when_max_gc_sec(double current_time) {

    52     return when_sec(current_time, max_gc_time());

    53   }

    55   inline jlong when_max_gc_ms(double current_time) {

    56     double when = when_max_gc_sec(current_time);

    57     return (jlong) (when * 1000.0);

    58   }

    60   inline jlong when_ms(double current_time, double pause_time) {

    61     double when = when_sec(current_time, pause_time);

    62     return (jlong) (when * 1000.0);

    63   }

    64 };

    66 class G1MMUTrackerQueueElem VALUE_OBJ_CLASS_SPEC {

    67 private:

    68   double _start_time;

    69   double _end_time;

    71 public:

    72   inline double start_time() { return _start_time; }

    73   inline double end_time()   { return _end_time; }

    74   inline double duration()   { return _end_time - _start_time; }

    76   G1MMUTrackerQueueElem() {

    77     _start_time = 0.0;

    78     _end_time   = 0.0;

    79   }

    81   G1MMUTrackerQueueElem(double start_time, double end_time) {

    82     _start_time = start_time;

    83     _end_time   = end_time;

    84   }

    85 };

    87 // this is an implementation of the MMUTracker using a (fixed-size) queue

    88 // that keeps track of all the recent pause times

    89 class G1MMUTrackerQueue: public G1MMUTracker {

    90 private:

    91   enum PrivateConstants {

    92     QueueLength = 64

    93   };

    95   // The array keeps track of all the pauses that fall within a time

    96   // slice (the last time slice during which pauses took place).

    97   // The data structure implemented is a circular queue.

    98   // Head "points" to the most recent addition, tail to the oldest one.

    99   // The array is of fixed size and I don't think we'll need more than

   100   // two or three entries with the current behaviour of G1 pauses.

   101   // If the array is full, an easy fix is to look for the pauses with

   102   // the shortest gap between them and concolidate them.

   104   G1MMUTrackerQueueElem _array[QueueLength];

   105   int                   _head_index;

   106   int                   _tail_index;

   107   int                   _no_entries;

   109   inline int trim_index(int index) {

   110     return (index + QueueLength) % QueueLength;

   111   }

   113   void remove_expired_entries(double current_time);

   114   double calculate_gc_time(double current_time);

   116   double longest_pause_internal(double current_time);

   117   double when_internal(double current_time, double pause_time);

   119 public:

   120   G1MMUTrackerQueue(double time_slice, double max_gc_time);

   122   virtual void add_pause(double start, double end, bool gc_thread);

   124   virtual double longest_pause(double current_time);

   125   virtual double when_sec(double current_time, double pause_time);

   126 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/g1/g1MMUTracker.hpp@035d2e036a9b

src/share/vm/gc_implementation/g1/g1MMUTracker.hpp