Mercurial > hg > truffle
annotate src/share/vm/memory/padded.hpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
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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 |