hotspot/src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp
author tonyp
Fri, 02 Oct 2009 16:12:07 -0400
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child 4481 de92ec484f5e
permissions -rw-r--r--
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
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/*
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 * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// Forward Decl.
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class ConcurrentG1Refine;
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// The G1 Concurrent Refinement Thread (could be several in the future).
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class ConcurrentG1RefineThread: public ConcurrentGCThread {
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  friend class VMStructs;
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  friend class G1CollectedHeap;
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  double _vtime_start;  // Initial virtual time.
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  double _vtime_accum;  // Initial virtual time.
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  int _worker_id;
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  int _worker_id_offset;
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  // The refinement threads collection is linked list. A predecessor can activate a successor
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  // when the number of the rset update buffer crosses a certain threshold. A successor
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  // would self-deactivate when the number of the buffers falls below the threshold.
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  bool _active;
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  ConcurrentG1RefineThread *       _next;
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 public:
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  virtual void run();
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  bool is_active()  { return _active;  }
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  void activate()   { _active = true;  }
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  void deactivate() { _active = false; }
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 private:
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  ConcurrentG1Refine*              _cg1r;
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  double                           _interval_ms;
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  void decreaseInterval(int processing_time_ms) {
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    double min_interval_ms = (double) processing_time_ms;
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    _interval_ms = 0.8 * _interval_ms;
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    if (_interval_ms < min_interval_ms)
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      _interval_ms = min_interval_ms;
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  }
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  void increaseInterval(int processing_time_ms) {
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    double max_interval_ms = 9.0 * (double) processing_time_ms;
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    _interval_ms = 1.1 * _interval_ms;
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    if (max_interval_ms > 0 && _interval_ms > max_interval_ms)
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      _interval_ms = max_interval_ms;
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  }
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  void sleepBeforeNextCycle();
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  // For use by G1CollectedHeap, which is a friend.
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  static SuspendibleThreadSet* sts() { return &_sts; }
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  // Constructor
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  ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,
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                           int worker_id_offset, int worker_id);
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  // Printing
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  void print() const;
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  void print_on(outputStream* st) const;
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  // Total virtual time so far.
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  double vtime_accum() { return _vtime_accum; }
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  ConcurrentG1Refine* cg1r()                     { return _cg1r;     }
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  void            sample_young_list_rs_lengths();
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  // Yield for GC
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  void            yield();
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  // shutdown
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  void stop();
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};