Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/gc_implementation/g1/heapRegion.inline.hpp@15c5903cf9e1 (annotated)
src/share/vm/gc_implementation/g1/heapRegion.inline.hpp
Mon, 03 Aug 2009 12:59:30 -0700
- author
- johnc
- date
- Mon, 03 Aug 2009 12:59:30 -0700
- changeset 1324
- 15c5903cf9e1
- parent 777
- 37f87013dfd8
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
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
| ysr@777 | 1 | /* |
| ysr@777 | 2 | * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. |
| ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| ysr@777 | 4 | * |
| ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
| ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| ysr@777 | 7 | * published by the Free Software Foundation. |
| ysr@777 | 8 | * |
| ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| ysr@777 | 13 | * accompanied this code). |
| ysr@777 | 14 | * |
| ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
| ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| ysr@777 | 18 | * |
| ysr@777 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| ysr@777 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| ysr@777 | 21 | * have any questions. |
| ysr@777 | 22 | * |
| ysr@777 | 23 | */ |
| ysr@777 | 24 | |
| ysr@777 | 25 | inline HeapWord* G1OffsetTableContigSpace::allocate(size_t size) { |
| ysr@777 | 26 | HeapWord* res = ContiguousSpace::allocate(size); |
| ysr@777 | 27 | if (res != NULL) { |
| ysr@777 | 28 | _offsets.alloc_block(res, size); |
| ysr@777 | 29 | } |
| ysr@777 | 30 | return res; |
| ysr@777 | 31 | } |
| ysr@777 | 32 | |
| ysr@777 | 33 | // Because of the requirement of keeping "_offsets" up to date with the |
| ysr@777 | 34 | // allocations, we sequentialize these with a lock. Therefore, best if |
| ysr@777 | 35 | // this is used for larger LAB allocations only. |
| ysr@777 | 36 | inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t size) { |
| ysr@777 | 37 | MutexLocker x(&_par_alloc_lock); |
| ysr@777 | 38 | // This ought to be just "allocate", because of the lock above, but that |
| ysr@777 | 39 | // ContiguousSpace::allocate asserts that either the allocating thread |
| ysr@777 | 40 | // holds the heap lock or it is the VM thread and we're at a safepoint. |
| ysr@777 | 41 | // The best I (dld) could figure was to put a field in ContiguousSpace |
| ysr@777 | 42 | // meaning "locking at safepoint taken care of", and set/reset that |
| ysr@777 | 43 | // here. But this will do for now, especially in light of the comment |
| ysr@777 | 44 | // above. Perhaps in the future some lock-free manner of keeping the |
| ysr@777 | 45 | // coordination. |
| ysr@777 | 46 | HeapWord* res = ContiguousSpace::par_allocate(size); |
| ysr@777 | 47 | if (res != NULL) { |
| ysr@777 | 48 | _offsets.alloc_block(res, size); |
| ysr@777 | 49 | } |
| ysr@777 | 50 | return res; |
| ysr@777 | 51 | } |
| ysr@777 | 52 | |
| ysr@777 | 53 | inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) { |
| ysr@777 | 54 | return _offsets.block_start(p); |
| ysr@777 | 55 | } |
| ysr@777 | 56 | |
| ysr@777 | 57 | inline HeapWord* |
| ysr@777 | 58 | G1OffsetTableContigSpace::block_start_const(const void* p) const { |
| ysr@777 | 59 | return _offsets.block_start_const(p); |
| ysr@777 | 60 | } |
