Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | ae52ee069062 |
| children |
| rev | line source |
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| 20337 | 1 /* |
| 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp" | |
| 27 #include "oops/markOop.hpp" | |
| 28 #include "oops/oop.inline.hpp" | |
| 29 #include "services/memTracker.hpp" | |
| 30 #ifdef TARGET_OS_FAMILY_linux | |
| 31 # include "os_linux.inline.hpp" | |
| 32 #endif | |
| 33 #ifdef TARGET_OS_FAMILY_solaris | |
| 34 # include "os_solaris.inline.hpp" | |
| 35 #endif | |
| 36 #ifdef TARGET_OS_FAMILY_windows | |
| 37 # include "os_windows.inline.hpp" | |
| 38 #endif | |
| 39 #ifdef TARGET_OS_FAMILY_aix | |
| 40 # include "os_aix.inline.hpp" | |
| 41 #endif | |
| 42 #ifdef TARGET_OS_FAMILY_bsd | |
| 43 # include "os_bsd.inline.hpp" | |
| 44 #endif | |
| 45 #include "utilities/bitMap.inline.hpp" | |
| 46 | |
| 47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL), | |
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48 _high_boundary(NULL), _committed(), _page_size(0), _special(false), |
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49 _dirty(), _executable(false) { |
| 20337 | 50 } |
| 51 | |
| 52 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) { | |
| 53 if (!rs.is_reserved()) { | |
| 54 return false; // Allocation failed. | |
| 55 } | |
| 56 assert(_low_boundary == NULL, "VirtualSpace already initialized"); | |
| 57 assert(page_size > 0, "Granularity must be non-zero."); | |
| 58 | |
| 59 _low_boundary = rs.base(); | |
| 60 _high_boundary = _low_boundary + rs.size(); | |
| 61 | |
| 62 _special = rs.special(); | |
| 63 _executable = rs.executable(); | |
| 64 | |
| 65 _page_size = page_size; | |
| 66 | |
| 67 assert(_committed.size() == 0, "virtual space initialized more than once"); | |
| 68 uintx size_in_bits = rs.size() / page_size; | |
| 69 _committed.resize(size_in_bits, /* in_resource_area */ false); | |
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70 if (_special) { |
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71 _dirty.resize(size_in_bits, /* in_resource_area */ false); |
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72 } |
| 20337 | 73 |
| 74 return true; | |
| 75 } | |
| 76 | |
| 77 | |
| 78 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() { | |
| 79 release(); | |
| 80 } | |
| 81 | |
| 82 void G1PageBasedVirtualSpace::release() { | |
| 83 // This does not release memory it never reserved. | |
| 84 // Caller must release via rs.release(); | |
| 85 _low_boundary = NULL; | |
| 86 _high_boundary = NULL; | |
| 87 _special = false; | |
| 88 _executable = false; | |
| 89 _page_size = 0; | |
| 90 _committed.resize(0, false); | |
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91 _dirty.resize(0, false); |
| 20337 | 92 } |
| 93 | |
| 94 size_t G1PageBasedVirtualSpace::committed_size() const { | |
| 95 return _committed.count_one_bits() * _page_size; | |
| 96 } | |
| 97 | |
| 98 size_t G1PageBasedVirtualSpace::reserved_size() const { | |
| 99 return pointer_delta(_high_boundary, _low_boundary, sizeof(char)); | |
| 100 } | |
| 101 | |
| 102 size_t G1PageBasedVirtualSpace::uncommitted_size() const { | |
| 103 return reserved_size() - committed_size(); | |
| 104 } | |
| 105 | |
| 106 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const { | |
| 107 return (addr - _low_boundary) / _page_size; | |
| 108 } | |
| 109 | |
| 110 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const { | |
| 111 uintptr_t end = start + size_in_pages; | |
| 112 return _committed.get_next_zero_offset(start, end) >= end; | |
| 113 } | |
| 114 | |
| 115 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const { | |
| 116 uintptr_t end = start + size_in_pages; | |
| 117 return _committed.get_next_one_offset(start, end) >= end; | |
| 118 } | |
| 119 | |
| 120 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) { | |
| 121 return _low_boundary + index * _page_size; | |
| 122 } | |
| 123 | |
| 124 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) { | |
| 125 return num * _page_size; | |
| 126 } | |
| 127 | |
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128 bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) { |
| 20337 | 129 // We need to make sure to commit all pages covered by the given area. |
| 130 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted"); | |
| 131 | |
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132 bool zero_filled = true; |
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133 uintptr_t end = start + size_in_pages; |
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134 |
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135 if (_special) { |
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136 // Check for dirty pages and update zero_filled if any found. |
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137 if (_dirty.get_next_one_offset(start,end) < end) { |
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138 zero_filled = false; |
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139 _dirty.clear_range(start, end); |
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140 } |
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141 } else { |
| 20337 | 142 os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable, |
| 143 err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages)); | |
| 144 } | |
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145 _committed.set_range(start, end); |
| 20337 | 146 |
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147 return zero_filled; |
| 20337 | 148 } |
| 149 | |
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150 void G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) { |
| 20337 | 151 guarantee(is_area_committed(start, size_in_pages), "checking"); |
| 152 | |
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153 if (_special) { |
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154 // Mark that memory is dirty. If committed again the memory might |
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155 // need to be cleared explicitly. |
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156 _dirty.set_range(start, start + size_in_pages); |
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157 } else { |
| 20337 | 158 os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages)); |
| 159 } | |
| 160 | |
| 161 _committed.clear_range(start, start + size_in_pages); | |
| 162 } | |
| 163 | |
| 164 bool G1PageBasedVirtualSpace::contains(const void* p) const { | |
| 165 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary; | |
| 166 } | |
| 167 | |
| 168 #ifndef PRODUCT | |
| 169 void G1PageBasedVirtualSpace::print_on(outputStream* out) { | |
| 170 out->print ("Virtual space:"); | |
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171 if (_special) out->print(" (pinned in memory)"); |
| 20337 | 172 out->cr(); |
| 173 out->print_cr(" - committed: " SIZE_FORMAT, committed_size()); | |
| 174 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); | |
| 175 out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary)); | |
| 176 } | |
| 177 | |
| 178 void G1PageBasedVirtualSpace::print() { | |
| 179 print_on(tty); | |
| 180 } | |
| 181 #endif |