jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentZFThread.hpp@15c5903cf9e1

6865703: G1: Parallelize hot card cache cleanup
Summary: Have the GC worker threads clear the hot card cache in parallel by having each worker thread claim a chunk of the card cache and process the cards in that chunk. The size of the chunks that each thread will claim is determined at VM initialization from the size of the card cache and the number of worker threads.
Reviewed-by: jmasa, tonyp

     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 ZF Thread.  Performs concurrent zero-filling.

    27 class ConcurrentZFThread: public ConcurrentGCThread {

    28   friend class VMStructs;

    29   friend class ZeroFillRegionClosure;

    31  private:

    33   // Zero fill the heap region.

    34   void processHeapRegion(HeapRegion* r);

    36   // Stats

    37   //   Allocation (protected by heap lock).

    38   static int _region_allocs;  // Number of regions allocated

    39   static int _sync_zfs;       //   Synchronous zero-fills +

    40   static int _zf_waits;      //   Wait for conc zero-fill completion.

    42   // Number of regions CFZ thread fills.

    43   static int _regions_filled;

    45   COTracker _co_tracker;

    47   double _vtime_start;  // Initial virtual time.

    49   // These are static because the "print_summary_info" method is, and

    50   // it currently assumes there is only one ZF thread.  We'll change when

    51   // we need to.

    52   static double _vtime_accum;  // Initial virtual time.

    53   static double vtime_accum() { return _vtime_accum; }

    55   // Offer yield for GC.  Returns true if yield occurred.

    56   bool offer_yield();

    58  public:

    59   // Constructor

    60   ConcurrentZFThread();

    62   // Main loop.

    63   virtual void run();

    65   // Printing

    66   void print();

    68   // Waits until "r" has been zero-filled.  Requires caller to hold the

    69   // ZF_mon.

    70   static void wait_for_ZF_completed(HeapRegion* r);

    72   // Get or clear the current unclean region.  Should be done

    73   // while holding the ZF_needed_mon lock.

    75   // shutdown

    76   void stop();

    78   // Stats

    79   static void note_region_alloc() {_region_allocs++; }

    80   static void note_sync_zfs() { _sync_zfs++; }

    81   static void note_zf_wait() { _zf_waits++; }

    82   static void note_region_filled() { _regions_filled++; }

    84   static void print_summary_info();

    85 };

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

src/share/vm/gc_implementation/g1/concurrentZFThread.hpp@15c5903cf9e1

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