view src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp @ 654:4f360ec815ba

6720309: G1: don't synchronously update RSet during evacuation pauses 6720334: G1: don't update RSets of collection set regions during an evacuation pause Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause Reviewed-by: apetrusenko, tonyp
author iveresov
date Fri, 06 Mar 2009 13:50:14 -0800
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children 315a5d70b295
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/*
 * Copyright 2001-2007 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.
 *
 */

// Forward Decl.
class ConcurrentG1Refine;

// The G1 Concurrent Refinement Thread (could be several in the future).

class ConcurrentG1RefineThread: public ConcurrentGCThread {
  friend class VMStructs;
  friend class G1CollectedHeap;

  double _vtime_start;  // Initial virtual time.
  double _vtime_accum;  // Initial virtual time.

 public:
  virtual void run();

 private:
  ConcurrentG1Refine*              _cg1r;
  bool                             _started;
  bool                             _in_progress;
  volatile bool                    _restart;

  COTracker                        _co_tracker;
  double                           _interval_ms;

  bool                             _do_traversal;

  void decreaseInterval(int processing_time_ms) {
    double min_interval_ms = (double) processing_time_ms;
    _interval_ms = 0.8 * _interval_ms;
    if (_interval_ms < min_interval_ms)
      _interval_ms = min_interval_ms;
  }
  void increaseInterval(int processing_time_ms) {
    double max_interval_ms = 9.0 * (double) processing_time_ms;
    _interval_ms = 1.1 * _interval_ms;
    if (max_interval_ms > 0 && _interval_ms > max_interval_ms)
      _interval_ms = max_interval_ms;
  }

  void sleepBeforeNextCycle();

  void traversalBasedRefinement();

  void queueBasedRefinement();

  // For use by G1CollectedHeap, which is a friend.
  static SuspendibleThreadSet* sts() { return &_sts; }

 public:
  // Constructor
  ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r);

  // Printing
  void print();

  // Total virtual time so far.
  double vtime_accum() { return _vtime_accum; }

  ConcurrentG1Refine* cg1r()                     { return _cg1r;     }


  void            set_started()                  { _started = true;   }
  void            clear_started()                { _started = false;  }
  bool            started()                      { return _started;   }

  void            set_in_progress()              { _in_progress = true;   }
  void            clear_in_progress()            { _in_progress = false;  }
  bool            in_progress()                  { return _in_progress;   }

  void            set_do_traversal(bool b);
  bool            do_traversal() { return _do_traversal; }

  void            sample_young_list_rs_lengths();

  // Yield for GC
  void            yield();

  // shutdown
  static void stop();
};