jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1MMUTracker.hpp@f9ec1e4bbb44 (annotated)

src/share/vm/gc_implementation/g1/g1MMUTracker.hpp@f9ec1e4bbb44 (annotated)

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

Thu, 15 Apr 2010 18:45:30 -0400

author: tonyp
date: Thu, 15 Apr 2010 18:45:30 -0400
changeset 1825: f9ec1e4bbb44
parent 1717: b81f3572f355
child 1907: c18cbe5936b8
permissions: -rw-r--r--

6939027: G1: assertion failure during the concurrent phase of cleanup
Summary: The outgoing region map is not maintained properly and it's causing an assert failure. Given that we don't actually use it, I'm removing it. I'm piggy-backing a small change on this which removes a message that it's printed before a Full GC when DisableExplicitGC is set.
Reviewed-by: apetrusenko, ysr

 /*
  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 // Keeps track of the GC work and decides when it is OK to do GC work
 // and for how long so that the MMU invariants are maintained.
 /***** ALL TIMES ARE IN SECS!!!!!!! *****/
 // this is the "interface"
 class G1MMUTracker: public CHeapObj {
 protected:
   double          _time_slice;
   double          _max_gc_time; // this is per time slice
 public:
   G1MMUTracker(double time_slice, double max_gc_time);
   virtual void add_pause(double start, double end, bool gc_thread) = 0;
   virtual double longest_pause(double current_time) = 0;
   virtual double when_sec(double current_time, double pause_time) = 0;
   double max_gc_time() {
     return _max_gc_time;
   }
   inline bool now_max_gc(double current_time) {
     return when_sec(current_time, max_gc_time()) < 0.00001;
   }
   inline double when_max_gc_sec(double current_time) {
     return when_sec(current_time, max_gc_time());
   }
   inline jlong when_max_gc_ms(double current_time) {
     double when = when_max_gc_sec(current_time);
     return (jlong) (when * 1000.0);
   }
   inline jlong when_ms(double current_time, double pause_time) {
     double when = when_sec(current_time, pause_time);
     return (jlong) (when * 1000.0);
   }
 };
 class G1MMUTrackerQueueElem VALUE_OBJ_CLASS_SPEC {
 private:
   double _start_time;
   double _end_time;
 public:
   inline double start_time() { return _start_time; }
   inline double end_time()   { return _end_time; }
   inline double duration()   { return _end_time - _start_time; }
   G1MMUTrackerQueueElem() {
     _start_time = 0.0;
     _end_time   = 0.0;
   }
   G1MMUTrackerQueueElem(double start_time, double end_time) {
     _start_time = start_time;
     _end_time   = end_time;
   }
 };
 // this is an implementation of the MMUTracker using a (fixed-size) queue
 // that keeps track of all the recent pause times
 class G1MMUTrackerQueue: public G1MMUTracker {
 private:
   enum PrivateConstants {
     QueueLength = 64
   };
   // The array keeps track of all the pauses that fall within a time
   // slice (the last time slice during which pauses took place).
   // The data structure implemented is a circular queue.
   // Head "points" to the most recent addition, tail to the oldest one.
   // The array is of fixed size and I don't think we'll need more than
   // two or three entries with the current behaviour of G1 pauses.
   // If the array is full, an easy fix is to look for the pauses with
   // the shortest gap between them and consolidate them.
   // For now, we have taken the expedient alternative of forgetting
   // the oldest entry in the event that +G1UseFixedWindowMMUTracker, thus
   // potentially violating MMU specs for some time thereafter.
   G1MMUTrackerQueueElem _array[QueueLength];
   int                   _head_index;
   int                   _tail_index;
   int                   _no_entries;
   inline int trim_index(int index) {
     return (index + QueueLength) % QueueLength;
   }
   void remove_expired_entries(double current_time);
   double calculate_gc_time(double current_time);
   double longest_pause_internal(double current_time);
   double when_internal(double current_time, double pause_time);
 public:
   G1MMUTrackerQueue(double time_slice, double max_gc_time);
   virtual void add_pause(double start, double end, bool gc_thread);
   virtual double longest_pause(double current_time);
   virtual double when_sec(double current_time, double pause_time);
 };

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src/share/vm/gc_implementation/g1/g1MMUTracker.hpp@f9ec1e4bbb44 (annotated)

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