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annotate src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.hpp @ 23472:047a642c9729

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8065579: WB method to start G1 concurrent mark cycle should be introduced Summary: Add a WhiteBox callback to the VM to start a concurrent mark cycle in G1. Reviewed-by: tschatzl, sjohanss Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
author kevinw
date Wed, 02 Dec 2015 13:58:34 +0530
parents 33e421924c67
children
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1 /*
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2 * Copyright (c) 2014, 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_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "memory/memRegion.hpp"
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30 #include "runtime/virtualspace.hpp"
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31 #include "utilities/bitMap.hpp"
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32
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33 // Virtual space management helper for a virtual space with an OS page allocation
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34 // granularity.
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35 // (De-)Allocation requests are always OS page aligned by passing a page index
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36 // and multiples of pages.
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37 // For systems that only commits of memory in a given size (always greater than
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38 // page size) the base address is required to be aligned to that page size.
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39 // The actual size requested need not be aligned to that page size, but the size
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40 // of the reservation passed may be rounded up to this page size. Any fragment
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41 // (less than the page size) of the actual size at the tail of the request will
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42 // be committed using OS small pages.
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43 // The implementation gives an error when trying to commit or uncommit pages that
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44 // have already been committed or uncommitted.
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45 class G1PageBasedVirtualSpace VALUE_OBJ_CLASS_SPEC {
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46 friend class VMStructs;
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47 private:
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48 // Reserved area addresses.
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49 char* _low_boundary;
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50 char* _high_boundary;
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51
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52 // The size of the tail in bytes of the handled space that needs to be committed
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53 // using small pages.
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54 size_t _tail_size;
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55
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56 // The preferred page size used for commit/uncommit in bytes.
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57 size_t _page_size;
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58
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59 // Bitmap used for verification of commit/uncommit operations.
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60 BitMap _committed;
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61
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62 // Bitmap used to keep track of which pages are dirty or not for _special
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63 // spaces. This is needed because for those spaces the underlying memory
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64 // will only be zero filled the first time it is committed. Calls to commit
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65 // will use this bitmap and return whether or not the memory is zero filled.
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66 BitMap _dirty;
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67
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68 // Indicates that the entire space has been committed and pinned in memory,
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69 // os::commit_memory() or os::uncommit_memory() have no function.
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70 bool _special;
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71
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72 // Indicates whether the committed space should be executable.
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73 bool _executable;
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74
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75 // Helper function for committing memory. Commit the given memory range by using
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76 // _page_size pages as much as possible and the remainder with small sized pages.
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77 void commit_internal(size_t start_page, size_t end_page);
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78 // Commit num_pages pages of _page_size size starting from start. All argument
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79 // checking has been performed.
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80 void commit_preferred_pages(size_t start_page, size_t end_page);
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81 // Commit space at the high end of the space that needs to be committed with small
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82 // sized pages.
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83 void commit_tail();
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84
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85 // Uncommit the given memory range.
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86 void uncommit_internal(size_t start_page, size_t end_page);
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87
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88 // Pretouch the given memory range.
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89 void pretouch_internal(size_t start_page, size_t end_page);
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90
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91 // Returns the index of the page which contains the given address.
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92 uintptr_t addr_to_page_index(char* addr) const;
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93 // Returns the address of the given page index.
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94 char* page_start(size_t index) const;
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95
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96 // Is the given page index the last page?
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97 bool is_last_page(size_t index) const { return index == (_committed.size() - 1); }
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98 // Is the given page index the first after last page?
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99 bool is_after_last_page(size_t index) const;
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100 // Is the last page only partially covered by this space?
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101 bool is_last_page_partial() const { return !is_ptr_aligned(_high_boundary, _page_size); }
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102 // Returns the end address of the given page bounded by the reserved space.
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103 char* bounded_end_addr(size_t end_page) const;
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104
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105 // Returns true if the entire area is backed by committed memory.
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106 bool is_area_committed(size_t start_page, size_t size_in_pages) const;
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107 // Returns true if the entire area is not backed by committed memory.
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108 bool is_area_uncommitted(size_t start_page, size_t size_in_pages) const;
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109
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110 void initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size);
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111 public:
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112
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113 // Commit the given area of pages starting at start being size_in_pages large.
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114 // Returns true if the given area is zero filled upon completion.
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115 bool commit(size_t start_page, size_t size_in_pages);
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116
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117 // Uncommit the given area of pages starting at start being size_in_pages large.
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118 void uncommit(size_t start_page, size_t size_in_pages);
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119
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120 // Initialize the given reserved space with the given base address and the size
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121 // actually used.
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122 // Prefer to commit in page_size chunks.
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123 G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size);
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124
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125 // Destruction
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126 ~G1PageBasedVirtualSpace();
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127
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128 // Amount of reserved memory.
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129 size_t reserved_size() const;
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130 // Memory used in this virtual space.
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131 size_t committed_size() const;
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132 // Memory left to use/expand in this virtual space.
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133 size_t uncommitted_size() const;
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134
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135 bool contains(const void* p) const;
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136
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137 MemRegion reserved() {
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138 MemRegion x((HeapWord*)_low_boundary, reserved_size() / HeapWordSize);
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139 return x;
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140 }
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141
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142 void release();
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143
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144 void check_for_contiguity() PRODUCT_RETURN;
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145
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146 // Debugging
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147 void print_on(outputStream* out) PRODUCT_RETURN;
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148 void print();
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149 };
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150
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151 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP