jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp@0bfd3fb24150

6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes

     1 /*

     2  * Copyright 2001-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // The Concurrent Mark GC Thread (could be several in the future).

    26 // This is copied from the Concurrent Mark Sweep GC Thread

    27 // Still under construction.

    29 class ConcurrentMark;

    31 class ConcurrentMarkThread: public ConcurrentGCThread {

    32   friend class VMStructs;

    34   double _vtime_start;  // Initial virtual time.

    35   double _vtime_accum;  // Accumulated virtual time.

    37   double _vtime_mark_accum;

    38   double _vtime_count_accum;

    40  public:

    41   virtual void run();

    43  private:

    44   ConcurrentMark*                  _cm;

    45   volatile bool                    _started;

    46   volatile bool                    _in_progress;

    48   void sleepBeforeNextCycle();

    50   static SurrogateLockerThread*         _slt;

    52  public:

    53   // Constructor

    54   ConcurrentMarkThread(ConcurrentMark* cm);

    56   static void makeSurrogateLockerThread(TRAPS);

    57   static SurrogateLockerThread* slt() { return _slt; }

    59   // Printing

    60   void print_on(outputStream* st) const;

    61   void print() const;

    63   // Total virtual time so far.

    64   double vtime_accum();

    65   // Marking virtual time so far

    66   double vtime_mark_accum();

    67   // Counting virtual time so far.

    68   double vtime_count_accum() { return _vtime_count_accum; }

    70   ConcurrentMark* cm()     { return _cm; }

    72   void set_started()       { _started = true;  }

    73   void clear_started()     { _started = false; }

    74   bool started()           { return _started;  }

    76   void set_in_progress()   { _in_progress = true;  }

    77   void clear_in_progress() { _in_progress = false; }

    78   bool in_progress()       { return _in_progress;  }

    80   // This flag returns true from the moment a marking cycle is

    81   // initiated (during the initial-mark pause when started() is set)

    82   // to the moment when the cycle completes (just after the next

    83   // marking bitmap has been cleared and in_progress() is

    84   // cleared). While this flag is true we will not start another cycle

    85   // so that cycles do not overlap. We cannot use just in_progress()

    86   // as the CM thread might take some time to wake up before noticing

    87   // that started() is set and set in_progress().

    88   bool during_cycle()      { return started() || in_progress(); }

    90   // Yield for GC

    91   void            yield();

    93   // shutdown

    94   void stop();

    95 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/g1/concurrentMarkThread.hpp@0bfd3fb24150

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