jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentZFThread.hpp@f9ec1e4bbb44

6939027: G1: assertion failure during the concurrent phase of cleanup
Summary: The outgoing region map is not maintained properly and it's causing an assert failure. Given that we don't actually use it, I'm removing it. I'm piggy-backing a small change on this which removes a message that it's printed before a Full GC when DisableExplicitGC is set.
Reviewed-by: apetrusenko, ysr

     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   double _vtime_start;  // Initial virtual time.

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

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

    49   // we need to.

    50   static double _vtime_accum;  // Initial virtual time.

    51   static double vtime_accum() { return _vtime_accum; }

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

    54   bool offer_yield();

    56  public:

    57   // Constructor

    58   ConcurrentZFThread();

    60   // Main loop.

    61   virtual void run();

    63   // Printing

    64   void print_on(outputStream* st) const;

    65   void print() const;

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

    68   // ZF_mon.

    69   static void wait_for_ZF_completed(HeapRegion* r);

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

    72   // while holding the ZF_needed_mon lock.

    74   // shutdown

    75   void stop();

    77   // Stats

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

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

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

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

    83   static void print_summary_info();

    84 };

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

src/share/vm/gc_implementation/g1/concurrentZFThread.hpp@f9ec1e4bbb44

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