Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.inline.hpp @ 1705:2d160770d2e5
6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp
| author | johnc |
|---|---|
| date | Mon, 02 Aug 2010 12:51:43 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2007, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 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 } | |
| 32 | |
| 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 } | |
| 52 | |
| 53 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) { | |
| 54 return _offsets.block_start(p); | |
| 55 } | |
| 56 | |
| 57 inline HeapWord* | |
| 58 G1OffsetTableContigSpace::block_start_const(const void* p) const { | |
| 59 return _offsets.block_start_const(p); | |
| 60 } |