Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/memory/metablock.cpp
src/share/vm/memory/metablock.cpp
- changeset 5967
- ee99e1a7c5fb
- parent 5705
- 335b388c4b28
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| 5966:d0453d2fd045 | 5967:ee99e1a7c5fb |
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| 1 /* | |
| 2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "memory/allocation.hpp" | |
| 27 #include "memory/metablock.hpp" | |
| 28 #include "utilities/copy.hpp" | |
| 29 #include "utilities/debug.hpp" | |
| 30 | |
| 31 // Blocks of space for metadata are allocated out of Metachunks. | |
| 32 // | |
| 33 // Metachunk are allocated out of MetadataVirtualspaces and once | |
| 34 // allocated there is no explicit link between a Metachunk and | |
| 35 // the MetadataVirtualspaces from which it was allocated. | |
| 36 // | |
| 37 // Each SpaceManager maintains a | |
| 38 // list of the chunks it is using and the current chunk. The current | |
| 39 // chunk is the chunk from which allocations are done. Space freed in | |
| 40 // a chunk is placed on the free list of blocks (BlockFreelist) and | |
| 41 // reused from there. | |
| 42 // | |
| 43 // Future modification | |
| 44 // | |
| 45 // The Metachunk can conceivable be replaced by the Chunk in | |
| 46 // allocation.hpp. Note that the latter Chunk is the space for | |
| 47 // allocation (allocations from the chunk are out of the space in | |
| 48 // the Chunk after the header for the Chunk) where as Metachunks | |
| 49 // point to space in a VirtualSpace. To replace Metachunks with | |
| 50 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace. | |
| 51 size_t Metablock::_min_block_byte_size = sizeof(Metablock); | |
| 52 | |
| 53 // New blocks returned by the Metaspace are zero initialized. | |
| 54 // We should fix the constructors to not assume this instead. | |
| 55 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) { | |
| 56 if (p == NULL) { | |
| 57 return NULL; | |
| 58 } | |
| 59 | |
| 60 Metablock* result = (Metablock*) p; | |
| 61 | |
| 62 // Clear the memory | |
| 63 Copy::fill_to_aligned_words((HeapWord*)result, word_size); | |
| 64 #ifdef ASSERT | |
| 65 result->set_word_size(word_size); | |
| 66 #endif | |
| 67 return result; | |
| 68 } |
