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annotate src/share/vm/memory/metablock.cpp @ 10241:d17700c82d7d

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8006088: Incompatible heap size flags accepted by VM Summary: Make processing of minimum, initial and maximum heap size more intiutive by removing previous limitations on allowed values, and make error reporting consistent. Further, fix errors in ergonomic heap sizing. Reviewed-by: johnc, jwilhelm, tamao
author tschatzl
date Mon, 06 May 2013 17:19:42 +0200
parents 5939f5953b45
children 335b388c4b28
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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 #ifdef ASSERT
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54 size_t Metablock::_overhead =
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55 Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord;
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56 #else
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57 size_t Metablock::_overhead = 0;
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58 #endif
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59
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60 // New blocks returned by the Metaspace are zero initialized.
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61 // We should fix the constructors to not assume this instead.
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62 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) {
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63 if (p == NULL) {
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64 return NULL;
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65 }
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66
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67 Metablock* result = (Metablock*) p;
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68
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69 // Clear the memory
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70 Copy::fill_to_aligned_words((HeapWord*)result, word_size);
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71 #ifdef ASSERT
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72 result->set_word_size(word_size);
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73 #endif
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74 return result;
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75 }