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annotate src/share/vm/memory/padded.hpp @ 12029:9766f73e770d

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8022880: False sharing between PSPromotionManager instances Summary: Pad the PSPromotionManager instances in the manager array. Reviewed-by: brutisso, jmasa
author stefank
date Fri, 31 May 2013 14:32:44 +0200
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children d7070f371770
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12029
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1 /*
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2 * Copyright (c) 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 #ifndef SHARE_VM_MEMORY_PADDED_HPP
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26 #define SHARE_VM_MEMORY_PADDED_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/globalDefinitions.hpp"
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30
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31 // Bytes needed to pad type to avoid cache-line sharing; alignment should be the
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32 // expected cache line size (a power of two). The first addend avoids sharing
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33 // when the start address is not a multiple of alignment; the second maintains
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34 // alignment of starting addresses that happen to be a multiple.
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35 #define PADDING_SIZE(type, alignment) \
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36 ((alignment) + align_size_up_(sizeof(type), alignment))
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37
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38 // Templates to create a subclass padded to avoid cache line sharing. These are
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39 // effective only when applied to derived-most (leaf) classes.
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40
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41 // When no args are passed to the base ctor.
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42 template <class T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
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43 class Padded : public T {
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44 private:
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45 char _pad_buf_[PADDING_SIZE(T, alignment)];
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46 };
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47
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48 // When either 0 or 1 args may be passed to the base ctor.
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49 template <class T, typename Arg1T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
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50 class Padded01 : public T {
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51 public:
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52 Padded01(): T() { }
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53 Padded01(Arg1T arg1): T(arg1) { }
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54 private:
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55 char _pad_buf_[PADDING_SIZE(T, alignment)];
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56 };
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57
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58 // Super class of PaddedEnd when pad_size != 0.
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59 template <class T, size_t pad_size>
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60 class PaddedEndImpl : public T {
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61 private:
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62 char _pad_buf[pad_size];
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63 };
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64
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65 // Super class of PaddedEnd when pad_size == 0.
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66 template <class T>
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67 class PaddedEndImpl<T, /*pad_size*/ 0> : public T {
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68 // No padding.
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69 };
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70
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71 #define PADDED_END_SIZE(type, alignment) (align_size_up_(sizeof(type), alignment) - sizeof(type))
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72
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73 // More memory conservative implementation of Padded. The subclass adds the
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74 // minimal amount of padding needed to make the size of the objects be aligned.
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75 // This will help reducing false sharing,
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76 // if the start address is a multiple of alignment.
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77 template <class T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
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78 class PaddedEnd : public PaddedEndImpl<T, PADDED_END_SIZE(T, alignment)> {
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79 // C++ don't allow zero-length arrays. The padding is put in a
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80 // super class that is specialized for the pad_size == 0 case.
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81 };
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82
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83 // Helper class to create an array of PaddedEnd<T> objects. All elements will
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84 // start at a multiple of alignment and the size will be aligned to alignment.
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85 template <class T, MEMFLAGS flags, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
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86 class PaddedArray {
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87 public:
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88 // Creates an aligned padded array.
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89 // The memory can't be deleted since the raw memory chunk is not returned.
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90 static PaddedEnd<T>* create_unfreeable(uint length);
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91 };
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92
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93 #endif // SHARE_VM_MEMORY_PADDED_HPP