jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegion.inline.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 2001-2007 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 inline HeapWord* G1OffsetTableContigSpace::allocate(size_t size) {

    26   HeapWord* res = ContiguousSpace::allocate(size);

    27   if (res != NULL) {

    28     _offsets.alloc_block(res, size);

    29   }

    30   return res;

    31 }

    33 // Because of the requirement of keeping "_offsets" up to date with the

    34 // allocations, we sequentialize these with a lock.  Therefore, best if

    35 // this is used for larger LAB allocations only.

    36 inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t size) {

    37   MutexLocker x(&_par_alloc_lock);

    38   // This ought to be just "allocate", because of the lock above, but that

    39   // ContiguousSpace::allocate asserts that either the allocating thread

    40   // holds the heap lock or it is the VM thread and we're at a safepoint.

    41   // The best I (dld) could figure was to put a field in ContiguousSpace

    42   // meaning "locking at safepoint taken care of", and set/reset that

    43   // here.  But this will do for now, especially in light of the comment

    44   // above.  Perhaps in the future some lock-free manner of keeping the

    45   // coordination.

    46   HeapWord* res = ContiguousSpace::par_allocate(size);

    47   if (res != NULL) {

    48     _offsets.alloc_block(res, size);

    49   }

    50   return res;

    51 }

    53 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) {

    54   return _offsets.block_start(p);

    55 }

    57 inline HeapWord*

    58 G1OffsetTableContigSpace::block_start_const(const void* p) const {

    59   return _offsets.block_start_const(p);

    60 }

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

src/share/vm/gc_implementation/g1/heapRegion.inline.hpp@15c5903cf9e1

src/share/vm/gc_implementation/g1/heapRegion.inline.hpp