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annotate src/share/vm/memory/metablock.cpp @ 12237:335b388c4b28

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8024651: Remove the incorrect usage of Metablock::overhead() Reviewed-by: brutisso, mgerdin, coleenp, jmasa
author stefank
date Fri, 13 Sep 2013 22:21:06 +0200
parents 5939f5953b45
children
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1 /*
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "memory/allocation.hpp"
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27 #include "memory/metablock.hpp"
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28 #include "utilities/copy.hpp"
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29 #include "utilities/debug.hpp"
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30
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31 // Blocks of space for metadata are allocated out of Metachunks.
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32 //
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33 // Metachunk are allocated out of MetadataVirtualspaces and once
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34 // allocated there is no explicit link between a Metachunk and
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35 // the MetadataVirtualspaces from which it was allocated.
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36 //
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37 // Each SpaceManager maintains a
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38 // list of the chunks it is using and the current chunk. The current
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39 // chunk is the chunk from which allocations are done. Space freed in
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40 // a chunk is placed on the free list of blocks (BlockFreelist) and
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41 // reused from there.
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42 //
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43 // Future modification
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44 //
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45 // The Metachunk can conceivable be replaced by the Chunk in
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46 // allocation.hpp. Note that the latter Chunk is the space for
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47 // allocation (allocations from the chunk are out of the space in
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48 // the Chunk after the header for the Chunk) where as Metachunks
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49 // point to space in a VirtualSpace. To replace Metachunks with
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50 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
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51 size_t Metablock::_min_block_byte_size = sizeof(Metablock);
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52
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53 // New blocks returned by the Metaspace are zero initialized.
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54 // We should fix the constructors to not assume this instead.
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55 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) {
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56 if (p == NULL) {
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57 return NULL;
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58 }
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59
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60 Metablock* result = (Metablock*) p;
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61
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62 // Clear the memory
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63 Copy::fill_to_aligned_words((HeapWord*)result, word_size);
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64 #ifdef ASSERT
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65 result->set_word_size(word_size);
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66 #endif
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67 return result;
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68 }