Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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rev | line source |
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20337 | 1 /* |
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2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
20337 | 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 | |
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47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) : |
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48 _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false), |
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49 _dirty(), _executable(false) { |
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50 initialize_with_page_size(rs, used_size, page_size); |
20337 | 51 } |
52 | |
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53 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) { |
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54 guarantee(rs.is_reserved(), "Given reserved space must have been reserved already."); |
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55 |
20337 | 56 assert(_low_boundary == NULL, "VirtualSpace already initialized"); |
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57 assert(page_size > 0, "Page size must be non-zero."); |
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58 |
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59 guarantee(is_ptr_aligned(rs.base(), page_size), |
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60 err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size)); |
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61 guarantee(is_size_aligned(used_size, os::vm_page_size()), |
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62 err_msg("Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size)); |
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63 guarantee(used_size <= rs.size(), |
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64 err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size())); |
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65 guarantee(is_size_aligned(rs.size(), page_size), |
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66 err_msg("Expected that the virtual space is size aligned, but " SIZE_FORMAT " is not aligned to page size " SIZE_FORMAT, rs.size(), page_size)); |
20337 | 67 |
68 _low_boundary = rs.base(); | |
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69 _high_boundary = _low_boundary + used_size; |
20337 | 70 |
71 _special = rs.special(); | |
72 _executable = rs.executable(); | |
73 | |
74 _page_size = page_size; | |
75 | |
76 assert(_committed.size() == 0, "virtual space initialized more than once"); | |
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77 BitMap::idx_t size_in_pages = rs.size() / page_size; |
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78 _committed.resize(size_in_pages, /* in_resource_area */ false); |
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79 if (_special) { |
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80 _dirty.resize(size_in_pages, /* in_resource_area */ false); |
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81 } |
20337 | 82 |
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83 _tail_size = used_size % _page_size; |
20337 | 84 } |
85 | |
86 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() { | |
87 release(); | |
88 } | |
89 | |
90 void G1PageBasedVirtualSpace::release() { | |
91 // This does not release memory it never reserved. | |
92 // Caller must release via rs.release(); | |
93 _low_boundary = NULL; | |
94 _high_boundary = NULL; | |
95 _special = false; | |
96 _executable = false; | |
97 _page_size = 0; | |
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98 _tail_size = 0; |
20337 | 99 _committed.resize(0, false); |
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100 _dirty.resize(0, false); |
20337 | 101 } |
102 | |
103 size_t G1PageBasedVirtualSpace::committed_size() const { | |
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104 size_t result = _committed.count_one_bits() * _page_size; |
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105 // The last page might not be in full. |
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106 if (is_last_page_partial() && _committed.at(_committed.size() - 1)) { |
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107 result -= _page_size - _tail_size; |
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108 } |
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109 return result; |
20337 | 110 } |
111 | |
112 size_t G1PageBasedVirtualSpace::reserved_size() const { | |
113 return pointer_delta(_high_boundary, _low_boundary, sizeof(char)); | |
114 } | |
115 | |
116 size_t G1PageBasedVirtualSpace::uncommitted_size() const { | |
117 return reserved_size() - committed_size(); | |
118 } | |
119 | |
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120 size_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const { |
20337 | 121 return (addr - _low_boundary) / _page_size; |
122 } | |
123 | |
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124 bool G1PageBasedVirtualSpace::is_area_committed(size_t start_page, size_t size_in_pages) const { |
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125 size_t end_page = start_page + size_in_pages; |
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126 return _committed.get_next_zero_offset(start_page, end_page) >= end_page; |
20337 | 127 } |
128 | |
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129 bool G1PageBasedVirtualSpace::is_area_uncommitted(size_t start_page, size_t size_in_pages) const { |
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130 size_t end_page = start_page + size_in_pages; |
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131 return _committed.get_next_one_offset(start_page, end_page) >= end_page; |
20337 | 132 } |
133 | |
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134 char* G1PageBasedVirtualSpace::page_start(size_t index) const { |
20337 | 135 return _low_boundary + index * _page_size; |
136 } | |
137 | |
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138 bool G1PageBasedVirtualSpace::is_after_last_page(size_t index) const { |
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139 guarantee(index <= _committed.size(), |
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140 err_msg("Given boundary page " SIZE_FORMAT " is beyond managed page count " SIZE_FORMAT, index, _committed.size())); |
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141 return index == _committed.size(); |
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142 } |
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143 |
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144 void G1PageBasedVirtualSpace::commit_preferred_pages(size_t start, size_t num_pages) { |
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145 assert(num_pages > 0, "No full pages to commit"); |
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146 assert(start + num_pages <= _committed.size(), |
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147 err_msg("Tried to commit area from page " SIZE_FORMAT " to page " SIZE_FORMAT " " |
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148 "that is outside of managed space of " SIZE_FORMAT " pages", |
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149 start, start + num_pages, _committed.size())); |
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150 |
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151 char* start_addr = page_start(start); |
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152 size_t size = num_pages * _page_size; |
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153 |
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154 os::commit_memory_or_exit(start_addr, size, _page_size, _executable, |
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155 err_msg("Failed to commit area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".", |
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156 p2i(start_addr), p2i(start_addr + size), size)); |
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157 } |
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158 |
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159 void G1PageBasedVirtualSpace::commit_tail() { |
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160 assert(_tail_size > 0, "The size of the tail area must be > 0 when reaching here"); |
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161 |
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162 char* const aligned_end_address = (char*)align_ptr_down(_high_boundary, _page_size); |
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163 os::commit_memory_or_exit(aligned_end_address, _tail_size, os::vm_page_size(), _executable, |
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164 err_msg("Failed to commit tail area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".", |
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165 p2i(aligned_end_address), p2i(_high_boundary), _tail_size)); |
20337 | 166 } |
167 | |
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168 void G1PageBasedVirtualSpace::commit_internal(size_t start_page, size_t end_page) { |
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169 guarantee(start_page < end_page, |
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170 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page)); |
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171 guarantee(end_page <= _committed.size(), |
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172 err_msg("Given end page " SIZE_FORMAT " is beyond end of managed page amount of " SIZE_FORMAT, end_page, _committed.size())); |
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173 |
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174 size_t pages = end_page - start_page; |
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175 bool need_to_commit_tail = is_after_last_page(end_page) && is_last_page_partial(); |
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176 |
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177 // If we have to commit some (partial) tail area, decrease the amount of pages to avoid |
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178 // committing that in the full-page commit code. |
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179 if (need_to_commit_tail) { |
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180 pages--; |
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181 } |
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182 |
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183 if (pages > 0) { |
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184 commit_preferred_pages(start_page, pages); |
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185 } |
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186 |
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187 if (need_to_commit_tail) { |
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188 commit_tail(); |
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189 } |
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190 } |
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191 |
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192 char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const { |
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193 return MIN2(_high_boundary, page_start(end_page)); |
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194 } |
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195 |
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196 void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) { |
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197 guarantee(start_page < end_page, |
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198 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page)); |
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199 |
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200 os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page)); |
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201 } |
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202 |
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203 bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) { |
20337 | 204 // We need to make sure to commit all pages covered by the given area. |
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205 guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted"); |
20337 | 206 |
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207 bool zero_filled = true; |
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208 size_t end_page = start_page + size_in_pages; |
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209 |
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210 if (_special) { |
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211 // Check for dirty pages and update zero_filled if any found. |
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212 if (_dirty.get_next_one_offset(start_page, end_page) < end_page) { |
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213 zero_filled = false; |
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214 _dirty.clear_range(start_page, end_page); |
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215 } |
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216 } else { |
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217 commit_internal(start_page, end_page); |
20337 | 218 } |
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219 _committed.set_range(start_page, end_page); |
20337 | 220 |
22973 | 221 if (AlwaysPreTouch) { |
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222 pretouch_internal(start_page, end_page); |
22973 | 223 } |
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224 return zero_filled; |
20337 | 225 } |
226 | |
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227 void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) { |
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228 guarantee(start_page < end_page, |
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229 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page)); |
20337 | 230 |
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231 char* start_addr = page_start(start_page); |
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232 os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char))); |
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233 } |
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234 |
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235 void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) { |
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236 guarantee(is_area_committed(start_page, size_in_pages), "checking"); |
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237 |
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238 size_t end_page = start_page + size_in_pages; |
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239 if (_special) { |
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240 // Mark that memory is dirty. If committed again the memory might |
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241 // need to be cleared explicitly. |
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242 _dirty.set_range(start_page, end_page); |
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243 } else { |
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244 uncommit_internal(start_page, end_page); |
20337 | 245 } |
246 | |
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247 _committed.clear_range(start_page, end_page); |
20337 | 248 } |
249 | |
250 bool G1PageBasedVirtualSpace::contains(const void* p) const { | |
251 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary; | |
252 } | |
253 | |
254 #ifndef PRODUCT | |
255 void G1PageBasedVirtualSpace::print_on(outputStream* out) { | |
256 out->print ("Virtual space:"); | |
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257 if (_special) out->print(" (pinned in memory)"); |
20337 | 258 out->cr(); |
259 out->print_cr(" - committed: " SIZE_FORMAT, committed_size()); | |
260 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); | |
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261 out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size); |
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262 out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary)); |
20337 | 263 } |
264 | |
265 void G1PageBasedVirtualSpace::print() { | |
266 print_on(tty); | |
267 } | |
268 #endif |