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src/share/vm/gc/g1/g1YoungRemSetSamplingThread.hpp

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   1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *


  38 // the remembered sets (and many other components), so this thread constantly
  39 // reevaluates the prediction for the remembered set scanning costs, and potentially
  40 // G1CollectorPolicy resizes the young gen. This may do a premature GC or even
  41 // increase the young gen size to keep pause time length goal.
  42 class G1YoungRemSetSamplingThread: public ConcurrentGCThread {
  43 private:
  44   Monitor* _monitor;
  45 
  46   void sample_young_list_rs_lengths();
  47 
  48   void run_service();
  49   void stop_service();
  50 
  51   void sleep_before_next_cycle();
  52 
  53   double _vtime_accum;  // Accumulated virtual time.
  54 
  55 public:
  56   G1YoungRemSetSamplingThread();
  57   double vtime_accum() { return _vtime_accum; }
  58 
  59   virtual void run();
  60   void stop();
  61 };
  62 
  63 #endif // SHARE_VM_GC_G1_G1YOUNGREMSETSAMPLINGTHREAD_HPP
   1 /*
   2  * Copyright (c) 2015, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *


  38 // the remembered sets (and many other components), so this thread constantly
  39 // reevaluates the prediction for the remembered set scanning costs, and potentially
  40 // G1CollectorPolicy resizes the young gen. This may do a premature GC or even
  41 // increase the young gen size to keep pause time length goal.
  42 class G1YoungRemSetSamplingThread: public ConcurrentGCThread {
  43 private:
  44   Monitor* _monitor;
  45 
  46   void sample_young_list_rs_lengths();
  47 
  48   void run_service();
  49   void stop_service();
  50 
  51   void sleep_before_next_cycle();
  52 
  53   double _vtime_accum;  // Accumulated virtual time.
  54 
  55 public:
  56   G1YoungRemSetSamplingThread();
  57   double vtime_accum() { return _vtime_accum; }



  58 };
  59 
  60 #endif // SHARE_VM_GC_G1_G1YOUNGREMSETSAMPLINGTHREAD_HPP
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