Mercurial > hg > truffle
annotate src/share/vm/runtime/virtualspace.cpp @ 7212:291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Fri, 14 Dec 2012 14:35:13 +0100 |
| parents | da91efe96a93 |
| children | 730cc4ddd550 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "oops/markOop.hpp" | |
| 27 #include "oops/oop.inline.hpp" | |
| 28 #include "runtime/virtualspace.hpp" | |
| 6197 | 29 #include "services/memTracker.hpp" |
| 1972 | 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 | |
| 3960 | 39 #ifdef TARGET_OS_FAMILY_bsd |
| 40 # include "os_bsd.inline.hpp" | |
| 41 #endif | |
| 0 | 42 |
| 43 | |
| 44 // ReservedSpace | |
| 45 ReservedSpace::ReservedSpace(size_t size) { | |
| 656 | 46 initialize(size, 0, false, NULL, 0, false); |
| 0 | 47 } |
| 48 | |
| 49 ReservedSpace::ReservedSpace(size_t size, size_t alignment, | |
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50 bool large, |
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51 char* requested_address, |
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52 const size_t noaccess_prefix) { |
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53 initialize(size+noaccess_prefix, alignment, large, requested_address, |
| 656 | 54 noaccess_prefix, false); |
| 55 } | |
| 56 | |
| 57 ReservedSpace::ReservedSpace(size_t size, size_t alignment, | |
| 58 bool large, | |
| 59 bool executable) { | |
| 60 initialize(size, alignment, large, NULL, 0, executable); | |
| 0 | 61 } |
| 62 | |
| 63 char * | |
| 64 ReservedSpace::align_reserved_region(char* addr, const size_t len, | |
| 65 const size_t prefix_size, | |
| 66 const size_t prefix_align, | |
| 67 const size_t suffix_size, | |
| 68 const size_t suffix_align) | |
| 69 { | |
| 70 assert(addr != NULL, "sanity"); | |
| 71 const size_t required_size = prefix_size + suffix_size; | |
| 72 assert(len >= required_size, "len too small"); | |
| 73 | |
| 74 const size_t s = size_t(addr); | |
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75 const size_t beg_ofs = (s + prefix_size) & (suffix_align - 1); |
| 0 | 76 const size_t beg_delta = beg_ofs == 0 ? 0 : suffix_align - beg_ofs; |
| 77 | |
| 78 if (len < beg_delta + required_size) { | |
| 79 return NULL; // Cannot do proper alignment. | |
| 80 } | |
| 81 const size_t end_delta = len - (beg_delta + required_size); | |
| 82 | |
| 83 if (beg_delta != 0) { | |
| 84 os::release_memory(addr, beg_delta); | |
| 85 } | |
| 86 | |
| 87 if (end_delta != 0) { | |
| 88 char* release_addr = (char*) (s + beg_delta + required_size); | |
| 89 os::release_memory(release_addr, end_delta); | |
| 90 } | |
| 91 | |
| 92 return (char*) (s + beg_delta); | |
| 93 } | |
| 94 | |
| 95 char* ReservedSpace::reserve_and_align(const size_t reserve_size, | |
| 96 const size_t prefix_size, | |
| 97 const size_t prefix_align, | |
| 98 const size_t suffix_size, | |
| 99 const size_t suffix_align) | |
| 100 { | |
| 101 assert(reserve_size > prefix_size + suffix_size, "should not be here"); | |
| 102 | |
| 103 char* raw_addr = os::reserve_memory(reserve_size, NULL, prefix_align); | |
| 104 if (raw_addr == NULL) return NULL; | |
| 105 | |
| 106 char* result = align_reserved_region(raw_addr, reserve_size, prefix_size, | |
| 107 prefix_align, suffix_size, | |
| 108 suffix_align); | |
| 109 if (result == NULL && !os::release_memory(raw_addr, reserve_size)) { | |
| 110 fatal("os::release_memory failed"); | |
| 111 } | |
| 112 | |
| 113 #ifdef ASSERT | |
| 114 if (result != NULL) { | |
| 115 const size_t raw = size_t(raw_addr); | |
| 116 const size_t res = size_t(result); | |
| 117 assert(res >= raw, "alignment decreased start addr"); | |
| 118 assert(res + prefix_size + suffix_size <= raw + reserve_size, | |
| 119 "alignment increased end addr"); | |
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120 assert((res & (prefix_align - 1)) == 0, "bad alignment of prefix"); |
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121 assert(((res + prefix_size) & (suffix_align - 1)) == 0, |
| 0 | 122 "bad alignment of suffix"); |
| 123 } | |
| 124 #endif | |
| 125 | |
| 126 return result; | |
| 127 } | |
| 128 | |
| 1618 | 129 // Helper method. |
| 130 static bool failed_to_reserve_as_requested(char* base, char* requested_address, | |
| 131 const size_t size, bool special) | |
| 132 { | |
| 133 if (base == requested_address || requested_address == NULL) | |
| 134 return false; // did not fail | |
| 135 | |
| 136 if (base != NULL) { | |
| 137 // Different reserve address may be acceptable in other cases | |
| 138 // but for compressed oops heap should be at requested address. | |
| 139 assert(UseCompressedOops, "currently requested address used only for compressed oops"); | |
| 140 if (PrintCompressedOopsMode) { | |
| 141 tty->cr(); | |
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142 tty->print_cr("Reserved memory not at requested address: " PTR_FORMAT " vs " PTR_FORMAT, base, requested_address); |
| 1618 | 143 } |
| 144 // OS ignored requested address. Try different address. | |
| 145 if (special) { | |
| 146 if (!os::release_memory_special(base, size)) { | |
| 147 fatal("os::release_memory_special failed"); | |
| 148 } | |
| 149 } else { | |
| 150 if (!os::release_memory(base, size)) { | |
| 151 fatal("os::release_memory failed"); | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 return true; | |
| 156 } | |
| 157 | |
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158 ReservedSpace::ReservedSpace(const size_t suffix_size, |
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159 const size_t suffix_align, |
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160 char* requested_address, |
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161 const size_t noaccess_prefix) |
| 0 | 162 { |
| 163 assert(suffix_size != 0, "sanity"); | |
| 164 assert(suffix_align != 0, "sanity"); | |
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165 assert((suffix_size & (suffix_align - 1)) == 0, |
| 0 | 166 "suffix_size not divisible by suffix_align"); |
| 167 | |
| 1618 | 168 // Assert that if noaccess_prefix is used, it is the same as prefix_align. |
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169 // Add in noaccess_prefix to prefix |
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170 const size_t adjusted_prefix_size = noaccess_prefix; |
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171 const size_t size = adjusted_prefix_size + suffix_size; |
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172 |
| 0 | 173 // On systems where the entire region has to be reserved and committed up |
| 174 // front, the compound alignment normally done by this method is unnecessary. | |
| 175 const bool try_reserve_special = UseLargePages && | |
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176 suffix_align == os::large_page_size(); |
| 0 | 177 if (!os::can_commit_large_page_memory() && try_reserve_special) { |
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178 initialize(size, suffix_align, true, requested_address, noaccess_prefix, |
| 656 | 179 false); |
| 0 | 180 return; |
| 181 } | |
| 182 | |
| 183 _base = NULL; | |
| 184 _size = 0; | |
| 185 _alignment = 0; | |
| 186 _special = false; | |
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187 _noaccess_prefix = 0; |
| 656 | 188 _executable = false; |
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189 |
| 0 | 190 // Optimistically try to reserve the exact size needed. |
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191 char* addr; |
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192 if (requested_address != 0) { |
| 1618 | 193 requested_address -= noaccess_prefix; // adjust address |
| 194 assert(requested_address != NULL, "huge noaccess prefix?"); | |
| 195 addr = os::attempt_reserve_memory_at(size, requested_address); | |
| 196 if (failed_to_reserve_as_requested(addr, requested_address, size, false)) { | |
| 197 // OS ignored requested address. Try different address. | |
| 198 addr = NULL; | |
| 199 } | |
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200 } else { |
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201 addr = os::reserve_memory(size, NULL, suffix_align); |
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202 } |
| 0 | 203 if (addr == NULL) return; |
| 204 | |
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205 // Check whether the result has the needed alignment |
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206 const size_t ofs = (size_t(addr) + adjusted_prefix_size) & (suffix_align - 1); |
| 0 | 207 if (ofs != 0) { |
| 208 // Wrong alignment. Release, allocate more space and do manual alignment. | |
| 209 // | |
| 210 // On most operating systems, another allocation with a somewhat larger size | |
| 211 // will return an address "close to" that of the previous allocation. The | |
| 212 // result is often the same address (if the kernel hands out virtual | |
| 213 // addresses from low to high), or an address that is offset by the increase | |
| 214 // in size. Exploit that to minimize the amount of extra space requested. | |
| 215 if (!os::release_memory(addr, size)) { | |
| 216 fatal("os::release_memory failed"); | |
| 217 } | |
| 218 | |
| 219 const size_t extra = MAX2(ofs, suffix_align - ofs); | |
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220 addr = reserve_and_align(size + extra, adjusted_prefix_size, suffix_align, |
| 0 | 221 suffix_size, suffix_align); |
| 222 if (addr == NULL) { | |
| 223 // Try an even larger region. If this fails, address space is exhausted. | |
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224 addr = reserve_and_align(size + suffix_align, adjusted_prefix_size, |
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225 suffix_align, suffix_size, suffix_align); |
| 0 | 226 } |
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227 |
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228 if (requested_address != 0 && |
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229 failed_to_reserve_as_requested(addr, requested_address, size, false)) { |
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230 // As a result of the alignment constraints, the allocated addr differs |
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231 // from the requested address. Return back to the caller who can |
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232 // take remedial action (like try again without a requested address). |
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233 assert(_base == NULL, "should be"); |
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234 return; |
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235 } |
| 0 | 236 } |
| 237 | |
| 238 _base = addr; | |
| 239 _size = size; | |
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240 _alignment = suffix_align; |
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241 _noaccess_prefix = noaccess_prefix; |
| 0 | 242 } |
| 243 | |
| 244 void ReservedSpace::initialize(size_t size, size_t alignment, bool large, | |
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245 char* requested_address, |
| 656 | 246 const size_t noaccess_prefix, |
| 247 bool executable) { | |
| 0 | 248 const size_t granularity = os::vm_allocation_granularity(); |
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249 assert((size & (granularity - 1)) == 0, |
| 0 | 250 "size not aligned to os::vm_allocation_granularity()"); |
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251 assert((alignment & (granularity - 1)) == 0, |
| 0 | 252 "alignment not aligned to os::vm_allocation_granularity()"); |
| 253 assert(alignment == 0 || is_power_of_2((intptr_t)alignment), | |
| 254 "not a power of 2"); | |
| 255 | |
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256 alignment = MAX2(alignment, (size_t)os::vm_page_size()); |
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257 |
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258 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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259 assert(noaccess_prefix == 0 || |
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260 noaccess_prefix == alignment, "noaccess prefix wrong"); |
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261 |
| 0 | 262 _base = NULL; |
| 263 _size = 0; | |
| 264 _special = false; | |
| 656 | 265 _executable = executable; |
| 0 | 266 _alignment = 0; |
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267 _noaccess_prefix = 0; |
| 0 | 268 if (size == 0) { |
| 269 return; | |
| 270 } | |
| 271 | |
| 272 // If OS doesn't support demand paging for large page memory, we need | |
| 273 // to use reserve_memory_special() to reserve and pin the entire region. | |
| 274 bool special = large && !os::can_commit_large_page_memory(); | |
| 275 char* base = NULL; | |
| 276 | |
| 1618 | 277 if (requested_address != 0) { |
| 278 requested_address -= noaccess_prefix; // adjust requested address | |
| 279 assert(requested_address != NULL, "huge noaccess prefix?"); | |
| 280 } | |
| 281 | |
| 0 | 282 if (special) { |
| 283 | |
| 656 | 284 base = os::reserve_memory_special(size, requested_address, executable); |
| 0 | 285 |
| 286 if (base != NULL) { | |
| 1618 | 287 if (failed_to_reserve_as_requested(base, requested_address, size, true)) { |
| 288 // OS ignored requested address. Try different address. | |
| 289 return; | |
| 290 } | |
| 0 | 291 // Check alignment constraints |
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292 assert((uintptr_t) base % alignment == 0, |
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293 "Large pages returned a non-aligned address"); |
| 0 | 294 _special = true; |
| 295 } else { | |
| 296 // failed; try to reserve regular memory below | |
| 1618 | 297 if (UseLargePages && (!FLAG_IS_DEFAULT(UseLargePages) || |
| 298 !FLAG_IS_DEFAULT(LargePageSizeInBytes))) { | |
| 299 if (PrintCompressedOopsMode) { | |
| 300 tty->cr(); | |
| 301 tty->print_cr("Reserve regular memory without large pages."); | |
| 302 } | |
| 303 } | |
| 0 | 304 } |
| 305 } | |
| 306 | |
| 307 if (base == NULL) { | |
| 308 // Optimistically assume that the OSes returns an aligned base pointer. | |
| 309 // When reserving a large address range, most OSes seem to align to at | |
| 310 // least 64K. | |
| 311 | |
| 312 // If the memory was requested at a particular address, use | |
| 313 // os::attempt_reserve_memory_at() to avoid over mapping something | |
| 314 // important. If available space is not detected, return NULL. | |
| 315 | |
| 316 if (requested_address != 0) { | |
| 1618 | 317 base = os::attempt_reserve_memory_at(size, requested_address); |
| 318 if (failed_to_reserve_as_requested(base, requested_address, size, false)) { | |
| 319 // OS ignored requested address. Try different address. | |
| 320 base = NULL; | |
| 321 } | |
| 0 | 322 } else { |
| 323 base = os::reserve_memory(size, NULL, alignment); | |
| 324 } | |
| 325 | |
| 326 if (base == NULL) return; | |
| 327 | |
| 328 // Check alignment constraints | |
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329 if ((((size_t)base + noaccess_prefix) & (alignment - 1)) != 0) { |
| 0 | 330 // Base not aligned, retry |
| 331 if (!os::release_memory(base, size)) fatal("os::release_memory failed"); | |
| 332 // Reserve size large enough to do manual alignment and | |
| 333 // increase size to a multiple of the desired alignment | |
| 334 size = align_size_up(size, alignment); | |
| 335 size_t extra_size = size + alignment; | |
| 342 | 336 do { |
| 337 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); | |
| 338 if (extra_base == NULL) return; | |
| 339 // Do manual alignement | |
| 340 base = (char*) align_size_up((uintptr_t) extra_base, alignment); | |
| 341 assert(base >= extra_base, "just checking"); | |
| 342 // Re-reserve the region at the aligned base address. | |
| 343 os::release_memory(extra_base, extra_size); | |
| 344 base = os::reserve_memory(size, base); | |
| 345 } while (base == NULL); | |
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346 |
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347 if (requested_address != 0 && |
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348 failed_to_reserve_as_requested(base, requested_address, size, false)) { |
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349 // As a result of the alignment constraints, the allocated base differs |
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350 // from the requested address. Return back to the caller who can |
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351 // take remedial action (like try again without a requested address). |
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352 assert(_base == NULL, "should be"); |
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353 return; |
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354 } |
| 0 | 355 } |
| 356 } | |
| 357 // Done | |
| 358 _base = base; | |
| 359 _size = size; | |
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360 _alignment = alignment; |
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361 _noaccess_prefix = noaccess_prefix; |
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362 |
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363 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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364 assert(noaccess_prefix == 0 || |
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365 noaccess_prefix == _alignment, "noaccess prefix wrong"); |
| 0 | 366 |
| 367 assert(markOopDesc::encode_pointer_as_mark(_base)->decode_pointer() == _base, | |
| 368 "area must be distinguisable from marks for mark-sweep"); | |
| 369 assert(markOopDesc::encode_pointer_as_mark(&_base[size])->decode_pointer() == &_base[size], | |
| 370 "area must be distinguisable from marks for mark-sweep"); | |
| 371 } | |
| 372 | |
| 373 | |
| 374 ReservedSpace::ReservedSpace(char* base, size_t size, size_t alignment, | |
| 656 | 375 bool special, bool executable) { |
| 0 | 376 assert((size % os::vm_allocation_granularity()) == 0, |
| 377 "size not allocation aligned"); | |
| 378 _base = base; | |
| 379 _size = size; | |
| 380 _alignment = alignment; | |
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381 _noaccess_prefix = 0; |
| 0 | 382 _special = special; |
| 656 | 383 _executable = executable; |
| 0 | 384 } |
| 385 | |
| 386 | |
| 387 ReservedSpace ReservedSpace::first_part(size_t partition_size, size_t alignment, | |
| 388 bool split, bool realloc) { | |
| 389 assert(partition_size <= size(), "partition failed"); | |
| 390 if (split) { | |
| 656 | 391 os::split_reserved_memory(base(), size(), partition_size, realloc); |
| 0 | 392 } |
| 656 | 393 ReservedSpace result(base(), partition_size, alignment, special(), |
| 394 executable()); | |
| 0 | 395 return result; |
| 396 } | |
| 397 | |
| 398 | |
| 399 ReservedSpace | |
| 400 ReservedSpace::last_part(size_t partition_size, size_t alignment) { | |
| 401 assert(partition_size <= size(), "partition failed"); | |
| 402 ReservedSpace result(base() + partition_size, size() - partition_size, | |
| 656 | 403 alignment, special(), executable()); |
| 0 | 404 return result; |
| 405 } | |
| 406 | |
| 407 | |
| 408 size_t ReservedSpace::page_align_size_up(size_t size) { | |
| 409 return align_size_up(size, os::vm_page_size()); | |
| 410 } | |
| 411 | |
| 412 | |
| 413 size_t ReservedSpace::page_align_size_down(size_t size) { | |
| 414 return align_size_down(size, os::vm_page_size()); | |
| 415 } | |
| 416 | |
| 417 | |
| 418 size_t ReservedSpace::allocation_align_size_up(size_t size) { | |
| 419 return align_size_up(size, os::vm_allocation_granularity()); | |
| 420 } | |
| 421 | |
| 422 | |
| 423 size_t ReservedSpace::allocation_align_size_down(size_t size) { | |
| 424 return align_size_down(size, os::vm_allocation_granularity()); | |
| 425 } | |
| 426 | |
| 427 | |
| 428 void ReservedSpace::release() { | |
| 429 if (is_reserved()) { | |
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430 char *real_base = _base - _noaccess_prefix; |
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431 const size_t real_size = _size + _noaccess_prefix; |
| 0 | 432 if (special()) { |
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433 os::release_memory_special(real_base, real_size); |
| 0 | 434 } else{ |
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435 os::release_memory(real_base, real_size); |
| 0 | 436 } |
| 437 _base = NULL; | |
| 438 _size = 0; | |
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439 _noaccess_prefix = 0; |
| 0 | 440 _special = false; |
| 656 | 441 _executable = false; |
| 0 | 442 } |
| 443 } | |
| 444 | |
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445 void ReservedSpace::protect_noaccess_prefix(const size_t size) { |
| 1618 | 446 assert( (_noaccess_prefix != 0) == (UseCompressedOops && _base != NULL && |
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447 (Universe::narrow_oop_base() != NULL) && |
| 1618 | 448 Universe::narrow_oop_use_implicit_null_checks()), |
| 449 "noaccess_prefix should be used only with non zero based compressed oops"); | |
| 450 | |
| 451 // If there is no noaccess prefix, return. | |
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452 if (_noaccess_prefix == 0) return; |
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453 |
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454 assert(_noaccess_prefix >= (size_t)os::vm_page_size(), |
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455 "must be at least page size big"); |
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456 |
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457 // Protect memory at the base of the allocated region. |
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458 // If special, the page was committed (only matters on windows) |
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459 if (!os::protect_memory(_base, _noaccess_prefix, os::MEM_PROT_NONE, |
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460 _special)) { |
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461 fatal("cannot protect protection page"); |
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462 } |
| 1618 | 463 if (PrintCompressedOopsMode) { |
| 464 tty->cr(); | |
| 465 tty->print_cr("Protected page at the reserved heap base: " PTR_FORMAT " / " INTX_FORMAT " bytes", _base, _noaccess_prefix); | |
| 466 } | |
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467 |
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468 _base += _noaccess_prefix; |
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469 _size -= _noaccess_prefix; |
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470 assert((size == _size) && ((uintptr_t)_base % _alignment == 0), |
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471 "must be exactly of required size and alignment"); |
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472 } |
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473 |
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474 ReservedHeapSpace::ReservedHeapSpace(size_t size, size_t alignment, |
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475 bool large, char* requested_address) : |
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476 ReservedSpace(size, alignment, large, |
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477 requested_address, |
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478 (UseCompressedOops && (Universe::narrow_oop_base() != NULL) && |
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479 Universe::narrow_oop_use_implicit_null_checks()) ? |
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480 lcm(os::vm_page_size(), alignment) : 0) { |
| 6197 | 481 if (base() > 0) { |
| 482 MemTracker::record_virtual_memory_type((address)base(), mtJavaHeap); | |
| 483 } | |
| 484 | |
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485 // Only reserved space for the java heap should have a noaccess_prefix |
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486 // if using compressed oops. |
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487 protect_noaccess_prefix(size); |
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488 } |
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489 |
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490 ReservedHeapSpace::ReservedHeapSpace(const size_t heap_space_size, |
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491 const size_t alignment, |
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492 char* requested_address) : |
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493 ReservedSpace(heap_space_size, alignment, |
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494 requested_address, |
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495 (UseCompressedOops && (Universe::narrow_oop_base() != NULL) && |
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496 Universe::narrow_oop_use_implicit_null_checks()) ? |
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497 lcm(os::vm_page_size(), alignment) : 0) { |
| 6197 | 498 if (base() > 0) { |
| 499 MemTracker::record_virtual_memory_type((address)base(), mtJavaHeap); | |
| 500 } | |
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501 protect_noaccess_prefix(heap_space_size); |
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502 } |
| 0 | 503 |
| 656 | 504 // Reserve space for code segment. Same as Java heap only we mark this as |
| 505 // executable. | |
| 506 ReservedCodeSpace::ReservedCodeSpace(size_t r_size, | |
| 507 size_t rs_align, | |
| 508 bool large) : | |
| 509 ReservedSpace(r_size, rs_align, large, /*executable*/ true) { | |
| 6197 | 510 MemTracker::record_virtual_memory_type((address)base(), mtCode); |
| 656 | 511 } |
| 512 | |
| 0 | 513 // VirtualSpace |
| 514 | |
| 515 VirtualSpace::VirtualSpace() { | |
| 516 _low_boundary = NULL; | |
| 517 _high_boundary = NULL; | |
| 518 _low = NULL; | |
| 519 _high = NULL; | |
| 520 _lower_high = NULL; | |
| 521 _middle_high = NULL; | |
| 522 _upper_high = NULL; | |
| 523 _lower_high_boundary = NULL; | |
| 524 _middle_high_boundary = NULL; | |
| 525 _upper_high_boundary = NULL; | |
| 526 _lower_alignment = 0; | |
| 527 _middle_alignment = 0; | |
| 528 _upper_alignment = 0; | |
|
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529 _special = false; |
| 656 | 530 _executable = false; |
| 0 | 531 } |
| 532 | |
| 533 | |
| 534 bool VirtualSpace::initialize(ReservedSpace rs, size_t committed_size) { | |
| 535 if(!rs.is_reserved()) return false; // allocation failed. | |
| 536 assert(_low_boundary == NULL, "VirtualSpace already initialized"); | |
| 537 _low_boundary = rs.base(); | |
| 538 _high_boundary = low_boundary() + rs.size(); | |
| 539 | |
| 540 _low = low_boundary(); | |
| 541 _high = low(); | |
| 542 | |
| 543 _special = rs.special(); | |
| 656 | 544 _executable = rs.executable(); |
| 0 | 545 |
| 546 // When a VirtualSpace begins life at a large size, make all future expansion | |
| 547 // and shrinking occur aligned to a granularity of large pages. This avoids | |
| 548 // fragmentation of physical addresses that inhibits the use of large pages | |
| 549 // by the OS virtual memory system. Empirically, we see that with a 4MB | |
| 550 // page size, the only spaces that get handled this way are codecache and | |
| 551 // the heap itself, both of which provide a substantial performance | |
| 552 // boost in many benchmarks when covered by large pages. | |
| 553 // | |
| 554 // No attempt is made to force large page alignment at the very top and | |
| 555 // bottom of the space if they are not aligned so already. | |
| 556 _lower_alignment = os::vm_page_size(); | |
| 557 _middle_alignment = os::page_size_for_region(rs.size(), rs.size(), 1); | |
| 558 _upper_alignment = os::vm_page_size(); | |
| 559 | |
| 560 // End of each region | |
| 561 _lower_high_boundary = (char*) round_to((intptr_t) low_boundary(), middle_alignment()); | |
| 562 _middle_high_boundary = (char*) round_down((intptr_t) high_boundary(), middle_alignment()); | |
| 563 _upper_high_boundary = high_boundary(); | |
| 564 | |
| 565 // High address of each region | |
| 566 _lower_high = low_boundary(); | |
| 567 _middle_high = lower_high_boundary(); | |
| 568 _upper_high = middle_high_boundary(); | |
| 569 | |
| 570 // commit to initial size | |
| 571 if (committed_size > 0) { | |
| 572 if (!expand_by(committed_size)) { | |
| 573 return false; | |
| 574 } | |
| 575 } | |
| 576 return true; | |
| 577 } | |
| 578 | |
| 579 | |
| 580 VirtualSpace::~VirtualSpace() { | |
| 581 release(); | |
| 582 } | |
| 583 | |
| 584 | |
| 585 void VirtualSpace::release() { | |
|
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586 // This does not release memory it never reserved. |
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587 // Caller must release via rs.release(); |
| 0 | 588 _low_boundary = NULL; |
| 589 _high_boundary = NULL; | |
| 590 _low = NULL; | |
| 591 _high = NULL; | |
| 592 _lower_high = NULL; | |
| 593 _middle_high = NULL; | |
| 594 _upper_high = NULL; | |
| 595 _lower_high_boundary = NULL; | |
| 596 _middle_high_boundary = NULL; | |
| 597 _upper_high_boundary = NULL; | |
| 598 _lower_alignment = 0; | |
| 599 _middle_alignment = 0; | |
| 600 _upper_alignment = 0; | |
| 601 _special = false; | |
| 656 | 602 _executable = false; |
| 0 | 603 } |
| 604 | |
| 605 | |
| 606 size_t VirtualSpace::committed_size() const { | |
| 607 return pointer_delta(high(), low(), sizeof(char)); | |
| 608 } | |
| 609 | |
| 610 | |
| 611 size_t VirtualSpace::reserved_size() const { | |
| 612 return pointer_delta(high_boundary(), low_boundary(), sizeof(char)); | |
| 613 } | |
| 614 | |
| 615 | |
| 616 size_t VirtualSpace::uncommitted_size() const { | |
| 617 return reserved_size() - committed_size(); | |
| 618 } | |
| 619 | |
| 620 | |
| 621 bool VirtualSpace::contains(const void* p) const { | |
| 622 return low() <= (const char*) p && (const char*) p < high(); | |
| 623 } | |
| 624 | |
| 625 /* | |
| 626 First we need to determine if a particular virtual space is using large | |
| 627 pages. This is done at the initialize function and only virtual spaces | |
| 628 that are larger than LargePageSizeInBytes use large pages. Once we | |
| 629 have determined this, all expand_by and shrink_by calls must grow and | |
| 630 shrink by large page size chunks. If a particular request | |
| 631 is within the current large page, the call to commit and uncommit memory | |
| 632 can be ignored. In the case that the low and high boundaries of this | |
| 633 space is not large page aligned, the pages leading to the first large | |
| 634 page address and the pages after the last large page address must be | |
| 635 allocated with default pages. | |
| 636 */ | |
| 637 bool VirtualSpace::expand_by(size_t bytes, bool pre_touch) { | |
| 638 if (uncommitted_size() < bytes) return false; | |
| 639 | |
| 640 if (special()) { | |
| 641 // don't commit memory if the entire space is pinned in memory | |
| 642 _high += bytes; | |
| 643 return true; | |
| 644 } | |
| 645 | |
| 646 char* previous_high = high(); | |
| 647 char* unaligned_new_high = high() + bytes; | |
| 648 assert(unaligned_new_high <= high_boundary(), | |
| 649 "cannot expand by more than upper boundary"); | |
| 650 | |
| 651 // Calculate where the new high for each of the regions should be. If | |
| 652 // the low_boundary() and high_boundary() are LargePageSizeInBytes aligned | |
| 653 // then the unaligned lower and upper new highs would be the | |
| 654 // lower_high() and upper_high() respectively. | |
| 655 char* unaligned_lower_new_high = | |
| 656 MIN2(unaligned_new_high, lower_high_boundary()); | |
| 657 char* unaligned_middle_new_high = | |
| 658 MIN2(unaligned_new_high, middle_high_boundary()); | |
| 659 char* unaligned_upper_new_high = | |
| 660 MIN2(unaligned_new_high, upper_high_boundary()); | |
| 661 | |
| 662 // Align the new highs based on the regions alignment. lower and upper | |
| 663 // alignment will always be default page size. middle alignment will be | |
| 664 // LargePageSizeInBytes if the actual size of the virtual space is in | |
| 665 // fact larger than LargePageSizeInBytes. | |
| 666 char* aligned_lower_new_high = | |
| 667 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
| 668 char* aligned_middle_new_high = | |
| 669 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
| 670 char* aligned_upper_new_high = | |
| 671 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
| 672 | |
| 673 // Determine which regions need to grow in this expand_by call. | |
| 674 // If you are growing in the lower region, high() must be in that | |
| 675 // region so calcuate the size based on high(). For the middle and | |
| 676 // upper regions, determine the starting point of growth based on the | |
| 677 // location of high(). By getting the MAX of the region's low address | |
| 678 // (or the prevoius region's high address) and high(), we can tell if it | |
| 679 // is an intra or inter region growth. | |
| 680 size_t lower_needs = 0; | |
| 681 if (aligned_lower_new_high > lower_high()) { | |
| 682 lower_needs = | |
| 683 pointer_delta(aligned_lower_new_high, lower_high(), sizeof(char)); | |
| 684 } | |
| 685 size_t middle_needs = 0; | |
| 686 if (aligned_middle_new_high > middle_high()) { | |
| 687 middle_needs = | |
| 688 pointer_delta(aligned_middle_new_high, middle_high(), sizeof(char)); | |
| 689 } | |
| 690 size_t upper_needs = 0; | |
| 691 if (aligned_upper_new_high > upper_high()) { | |
| 692 upper_needs = | |
| 693 pointer_delta(aligned_upper_new_high, upper_high(), sizeof(char)); | |
| 694 } | |
| 695 | |
| 696 // Check contiguity. | |
| 697 assert(low_boundary() <= lower_high() && | |
| 698 lower_high() <= lower_high_boundary(), | |
| 699 "high address must be contained within the region"); | |
| 700 assert(lower_high_boundary() <= middle_high() && | |
| 701 middle_high() <= middle_high_boundary(), | |
| 702 "high address must be contained within the region"); | |
| 703 assert(middle_high_boundary() <= upper_high() && | |
| 704 upper_high() <= upper_high_boundary(), | |
| 705 "high address must be contained within the region"); | |
| 706 | |
| 707 // Commit regions | |
| 708 if (lower_needs > 0) { | |
| 709 assert(low_boundary() <= lower_high() && | |
| 710 lower_high() + lower_needs <= lower_high_boundary(), | |
| 711 "must not expand beyond region"); | |
| 656 | 712 if (!os::commit_memory(lower_high(), lower_needs, _executable)) { |
| 0 | 713 debug_only(warning("os::commit_memory failed")); |
| 714 return false; | |
| 715 } else { | |
| 716 _lower_high += lower_needs; | |
| 717 } | |
| 718 } | |
| 719 if (middle_needs > 0) { | |
| 720 assert(lower_high_boundary() <= middle_high() && | |
| 721 middle_high() + middle_needs <= middle_high_boundary(), | |
| 722 "must not expand beyond region"); | |
| 656 | 723 if (!os::commit_memory(middle_high(), middle_needs, middle_alignment(), |
| 724 _executable)) { | |
| 0 | 725 debug_only(warning("os::commit_memory failed")); |
| 726 return false; | |
| 727 } | |
| 728 _middle_high += middle_needs; | |
| 729 } | |
| 730 if (upper_needs > 0) { | |
| 731 assert(middle_high_boundary() <= upper_high() && | |
| 732 upper_high() + upper_needs <= upper_high_boundary(), | |
| 733 "must not expand beyond region"); | |
| 656 | 734 if (!os::commit_memory(upper_high(), upper_needs, _executable)) { |
| 0 | 735 debug_only(warning("os::commit_memory failed")); |
| 736 return false; | |
| 737 } else { | |
| 738 _upper_high += upper_needs; | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 if (pre_touch || AlwaysPreTouch) { | |
| 743 int vm_ps = os::vm_page_size(); | |
| 744 for (char* curr = previous_high; | |
| 745 curr < unaligned_new_high; | |
| 746 curr += vm_ps) { | |
| 747 // Note the use of a write here; originally we tried just a read, but | |
| 748 // since the value read was unused, the optimizer removed the read. | |
| 749 // If we ever have a concurrent touchahead thread, we'll want to use | |
| 750 // a read, to avoid the potential of overwriting data (if a mutator | |
| 751 // thread beats the touchahead thread to a page). There are various | |
| 752 // ways of making sure this read is not optimized away: for example, | |
| 753 // generating the code for a read procedure at runtime. | |
| 754 *curr = 0; | |
| 755 } | |
| 756 } | |
| 757 | |
| 758 _high += bytes; | |
| 759 return true; | |
| 760 } | |
| 761 | |
| 762 // A page is uncommitted if the contents of the entire page is deemed unusable. | |
| 763 // Continue to decrement the high() pointer until it reaches a page boundary | |
| 764 // in which case that particular page can now be uncommitted. | |
| 765 void VirtualSpace::shrink_by(size_t size) { | |
| 766 if (committed_size() < size) | |
| 767 fatal("Cannot shrink virtual space to negative size"); | |
| 768 | |
| 769 if (special()) { | |
| 770 // don't uncommit if the entire space is pinned in memory | |
| 771 _high -= size; | |
| 772 return; | |
| 773 } | |
| 774 | |
| 775 char* unaligned_new_high = high() - size; | |
| 776 assert(unaligned_new_high >= low_boundary(), "cannot shrink past lower boundary"); | |
| 777 | |
| 778 // Calculate new unaligned address | |
| 779 char* unaligned_upper_new_high = | |
| 780 MAX2(unaligned_new_high, middle_high_boundary()); | |
| 781 char* unaligned_middle_new_high = | |
| 782 MAX2(unaligned_new_high, lower_high_boundary()); | |
| 783 char* unaligned_lower_new_high = | |
| 784 MAX2(unaligned_new_high, low_boundary()); | |
| 785 | |
| 786 // Align address to region's alignment | |
| 787 char* aligned_upper_new_high = | |
| 788 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
| 789 char* aligned_middle_new_high = | |
| 790 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
| 791 char* aligned_lower_new_high = | |
| 792 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
| 793 | |
| 794 // Determine which regions need to shrink | |
| 795 size_t upper_needs = 0; | |
| 796 if (aligned_upper_new_high < upper_high()) { | |
| 797 upper_needs = | |
| 798 pointer_delta(upper_high(), aligned_upper_new_high, sizeof(char)); | |
| 799 } | |
| 800 size_t middle_needs = 0; | |
| 801 if (aligned_middle_new_high < middle_high()) { | |
| 802 middle_needs = | |
| 803 pointer_delta(middle_high(), aligned_middle_new_high, sizeof(char)); | |
| 804 } | |
| 805 size_t lower_needs = 0; | |
| 806 if (aligned_lower_new_high < lower_high()) { | |
| 807 lower_needs = | |
| 808 pointer_delta(lower_high(), aligned_lower_new_high, sizeof(char)); | |
| 809 } | |
| 810 | |
| 811 // Check contiguity. | |
| 812 assert(middle_high_boundary() <= upper_high() && | |
| 813 upper_high() <= upper_high_boundary(), | |
| 814 "high address must be contained within the region"); | |
| 815 assert(lower_high_boundary() <= middle_high() && | |
| 816 middle_high() <= middle_high_boundary(), | |
| 817 "high address must be contained within the region"); | |
| 818 assert(low_boundary() <= lower_high() && | |
| 819 lower_high() <= lower_high_boundary(), | |
| 820 "high address must be contained within the region"); | |
| 821 | |
| 822 // Uncommit | |
| 823 if (upper_needs > 0) { | |
| 824 assert(middle_high_boundary() <= aligned_upper_new_high && | |
| 825 aligned_upper_new_high + upper_needs <= upper_high_boundary(), | |
| 826 "must not shrink beyond region"); | |
| 827 if (!os::uncommit_memory(aligned_upper_new_high, upper_needs)) { | |
| 828 debug_only(warning("os::uncommit_memory failed")); | |
| 829 return; | |
| 830 } else { | |
| 831 _upper_high -= upper_needs; | |
| 832 } | |
| 833 } | |
| 834 if (middle_needs > 0) { | |
| 835 assert(lower_high_boundary() <= aligned_middle_new_high && | |
| 836 aligned_middle_new_high + middle_needs <= middle_high_boundary(), | |
| 837 "must not shrink beyond region"); | |
| 838 if (!os::uncommit_memory(aligned_middle_new_high, middle_needs)) { | |
| 839 debug_only(warning("os::uncommit_memory failed")); | |
| 840 return; | |
| 841 } else { | |
| 842 _middle_high -= middle_needs; | |
| 843 } | |
| 844 } | |
| 845 if (lower_needs > 0) { | |
| 846 assert(low_boundary() <= aligned_lower_new_high && | |
| 847 aligned_lower_new_high + lower_needs <= lower_high_boundary(), | |
| 848 "must not shrink beyond region"); | |
| 849 if (!os::uncommit_memory(aligned_lower_new_high, lower_needs)) { | |
| 850 debug_only(warning("os::uncommit_memory failed")); | |
| 851 return; | |
| 852 } else { | |
| 853 _lower_high -= lower_needs; | |
| 854 } | |
| 855 } | |
| 856 | |
| 857 _high -= size; | |
| 858 } | |
| 859 | |
| 860 #ifndef PRODUCT | |
| 861 void VirtualSpace::check_for_contiguity() { | |
| 862 // Check contiguity. | |
| 863 assert(low_boundary() <= lower_high() && | |
| 864 lower_high() <= lower_high_boundary(), | |
| 865 "high address must be contained within the region"); | |
| 866 assert(lower_high_boundary() <= middle_high() && | |
| 867 middle_high() <= middle_high_boundary(), | |
| 868 "high address must be contained within the region"); | |
| 869 assert(middle_high_boundary() <= upper_high() && | |
| 870 upper_high() <= upper_high_boundary(), | |
| 871 "high address must be contained within the region"); | |
| 872 assert(low() >= low_boundary(), "low"); | |
| 873 assert(low_boundary() <= lower_high_boundary(), "lower high boundary"); | |
| 874 assert(upper_high_boundary() <= high_boundary(), "upper high boundary"); | |
| 875 assert(high() <= upper_high(), "upper high"); | |
| 876 } | |
| 877 | |
| 878 void VirtualSpace::print() { | |
| 879 tty->print ("Virtual space:"); | |
| 880 if (special()) tty->print(" (pinned in memory)"); | |
| 881 tty->cr(); | |
| 882 tty->print_cr(" - committed: %ld", committed_size()); | |
| 883 tty->print_cr(" - reserved: %ld", reserved_size()); | |
| 884 tty->print_cr(" - [low, high]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low(), high()); | |
| 885 tty->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low_boundary(), high_boundary()); | |
| 886 } | |
| 887 | |
| 888 #endif |