ysr@777: /*
xdono@1279:  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
ysr@777:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
ysr@777:  * CA 95054 USA or visit www.sun.com if you need additional information or
ysr@777:  * have any questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
ysr@777: // Forward Decl.
ysr@777: class ConcurrentG1Refine;
ysr@777: 
ysr@777: // The G1 Concurrent Refinement Thread (could be several in the future).
ysr@777: 
ysr@777: class ConcurrentG1RefineThread: public ConcurrentGCThread {
ysr@777:   friend class VMStructs;
ysr@777:   friend class G1CollectedHeap;
ysr@777: 
ysr@777:   double _vtime_start;  // Initial virtual time.
ysr@777:   double _vtime_accum;  // Initial virtual time.
iveresov@1229:   int _worker_id;
iveresov@1230:   int _worker_id_offset;
ysr@777: 
iveresov@1229:   // The refinement threads collection is linked list. A predecessor can activate a successor
iveresov@1229:   // when the number of the rset update buffer crosses a certain threshold. A successor
iveresov@1229:   // would self-deactivate when the number of the buffers falls below the threshold.
iveresov@1229:   bool _active;
iveresov@1229:   ConcurrentG1RefineThread *       _next;
ysr@777:  public:
ysr@777:   virtual void run();
ysr@777: 
iveresov@1229:   bool is_active()  { return _active;  }
iveresov@1229:   void activate()   { _active = true;  }
iveresov@1229:   void deactivate() { _active = false; }
iveresov@1229: 
ysr@777:  private:
ysr@777:   ConcurrentG1Refine*              _cg1r;
ysr@777: 
ysr@777:   double                           _interval_ms;
ysr@777: 
ysr@777:   void decreaseInterval(int processing_time_ms) {
ysr@777:     double min_interval_ms = (double) processing_time_ms;
ysr@777:     _interval_ms = 0.8 * _interval_ms;
ysr@777:     if (_interval_ms < min_interval_ms)
ysr@777:       _interval_ms = min_interval_ms;
ysr@777:   }
ysr@777:   void increaseInterval(int processing_time_ms) {
ysr@777:     double max_interval_ms = 9.0 * (double) processing_time_ms;
ysr@777:     _interval_ms = 1.1 * _interval_ms;
ysr@777:     if (max_interval_ms > 0 && _interval_ms > max_interval_ms)
ysr@777:       _interval_ms = max_interval_ms;
ysr@777:   }
ysr@777: 
ysr@777:   void sleepBeforeNextCycle();
ysr@777: 
ysr@777:   // For use by G1CollectedHeap, which is a friend.
ysr@777:   static SuspendibleThreadSet* sts() { return &_sts; }
ysr@777: 
ysr@777:  public:
ysr@777:   // Constructor
iveresov@1230:   ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,
iveresov@1230:                            int worker_id_offset, int worker_id);
ysr@777: 
ysr@777:   // Printing
tonyp@1454:   void print() const;
tonyp@1454:   void print_on(outputStream* st) const;
ysr@777: 
ysr@777:   // Total virtual time so far.
ysr@777:   double vtime_accum() { return _vtime_accum; }
ysr@777: 
ysr@777:   ConcurrentG1Refine* cg1r()                     { return _cg1r;     }
ysr@777: 
ysr@777:   void            sample_young_list_rs_lengths();
ysr@777: 
ysr@777:   // Yield for GC
ysr@777:   void            yield();
ysr@777: 
ysr@777:   // shutdown
iveresov@1229:   void stop();
ysr@777: };