Mercurial > hg > truffle
annotate src/share/vm/runtime/virtualspace.cpp @ 11893:ec267141f753
more javadoc and output tweaks for dynamic counters
| author | Lukas Stadler <lukas.stadler@jku.at> |
|---|---|
| date | Fri, 04 Oct 2013 11:56:18 +0200 |
| parents | a837fa3d3f86 |
| children | 4c84d351cca9 bdd155477289 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 | |
| 1618 | 63 // Helper method. |
| 64 static bool failed_to_reserve_as_requested(char* base, char* requested_address, | |
| 65 const size_t size, bool special) | |
| 66 { | |
| 67 if (base == requested_address || requested_address == NULL) | |
| 68 return false; // did not fail | |
| 69 | |
| 70 if (base != NULL) { | |
| 71 // Different reserve address may be acceptable in other cases | |
| 72 // but for compressed oops heap should be at requested address. | |
| 73 assert(UseCompressedOops, "currently requested address used only for compressed oops"); | |
| 74 if (PrintCompressedOopsMode) { | |
| 75 tty->cr(); | |
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76 tty->print_cr("Reserved memory not at requested address: " PTR_FORMAT " vs " PTR_FORMAT, base, requested_address); |
| 1618 | 77 } |
| 78 // OS ignored requested address. Try different address. | |
| 79 if (special) { | |
| 80 if (!os::release_memory_special(base, size)) { | |
| 81 fatal("os::release_memory_special failed"); | |
| 82 } | |
| 83 } else { | |
| 84 if (!os::release_memory(base, size)) { | |
| 85 fatal("os::release_memory failed"); | |
| 86 } | |
| 87 } | |
| 88 } | |
| 89 return true; | |
| 90 } | |
| 91 | |
| 0 | 92 void ReservedSpace::initialize(size_t size, size_t alignment, bool large, |
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93 char* requested_address, |
| 656 | 94 const size_t noaccess_prefix, |
| 95 bool executable) { | |
| 0 | 96 const size_t granularity = os::vm_allocation_granularity(); |
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97 assert((size & (granularity - 1)) == 0, |
| 0 | 98 "size not aligned to os::vm_allocation_granularity()"); |
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99 assert((alignment & (granularity - 1)) == 0, |
| 0 | 100 "alignment not aligned to os::vm_allocation_granularity()"); |
| 101 assert(alignment == 0 || is_power_of_2((intptr_t)alignment), | |
| 102 "not a power of 2"); | |
| 103 | |
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104 alignment = MAX2(alignment, (size_t)os::vm_page_size()); |
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105 |
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106 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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107 assert(noaccess_prefix == 0 || |
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108 noaccess_prefix == alignment, "noaccess prefix wrong"); |
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109 |
| 0 | 110 _base = NULL; |
| 111 _size = 0; | |
| 112 _special = false; | |
| 656 | 113 _executable = executable; |
| 0 | 114 _alignment = 0; |
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115 _noaccess_prefix = 0; |
| 0 | 116 if (size == 0) { |
| 117 return; | |
| 118 } | |
| 119 | |
| 120 // If OS doesn't support demand paging for large page memory, we need | |
| 121 // to use reserve_memory_special() to reserve and pin the entire region. | |
| 122 bool special = large && !os::can_commit_large_page_memory(); | |
| 123 char* base = NULL; | |
| 124 | |
| 1618 | 125 if (requested_address != 0) { |
| 126 requested_address -= noaccess_prefix; // adjust requested address | |
| 127 assert(requested_address != NULL, "huge noaccess prefix?"); | |
| 128 } | |
| 129 | |
| 0 | 130 if (special) { |
| 131 | |
| 656 | 132 base = os::reserve_memory_special(size, requested_address, executable); |
| 0 | 133 |
| 134 if (base != NULL) { | |
| 1618 | 135 if (failed_to_reserve_as_requested(base, requested_address, size, true)) { |
| 136 // OS ignored requested address. Try different address. | |
| 137 return; | |
| 138 } | |
| 0 | 139 // Check alignment constraints |
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140 assert((uintptr_t) base % alignment == 0, |
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141 "Large pages returned a non-aligned address"); |
| 0 | 142 _special = true; |
| 143 } else { | |
| 144 // failed; try to reserve regular memory below | |
| 1618 | 145 if (UseLargePages && (!FLAG_IS_DEFAULT(UseLargePages) || |
| 146 !FLAG_IS_DEFAULT(LargePageSizeInBytes))) { | |
| 147 if (PrintCompressedOopsMode) { | |
| 148 tty->cr(); | |
| 149 tty->print_cr("Reserve regular memory without large pages."); | |
| 150 } | |
| 151 } | |
| 0 | 152 } |
| 153 } | |
| 154 | |
| 155 if (base == NULL) { | |
| 156 // Optimistically assume that the OSes returns an aligned base pointer. | |
| 157 // When reserving a large address range, most OSes seem to align to at | |
| 158 // least 64K. | |
| 159 | |
| 160 // If the memory was requested at a particular address, use | |
| 161 // os::attempt_reserve_memory_at() to avoid over mapping something | |
| 162 // important. If available space is not detected, return NULL. | |
| 163 | |
| 164 if (requested_address != 0) { | |
| 1618 | 165 base = os::attempt_reserve_memory_at(size, requested_address); |
| 166 if (failed_to_reserve_as_requested(base, requested_address, size, false)) { | |
| 167 // OS ignored requested address. Try different address. | |
| 168 base = NULL; | |
| 169 } | |
| 0 | 170 } else { |
| 171 base = os::reserve_memory(size, NULL, alignment); | |
| 172 } | |
| 173 | |
| 174 if (base == NULL) return; | |
| 175 | |
| 176 // Check alignment constraints | |
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177 if ((((size_t)base + noaccess_prefix) & (alignment - 1)) != 0) { |
| 0 | 178 // Base not aligned, retry |
| 179 if (!os::release_memory(base, size)) fatal("os::release_memory failed"); | |
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180 // Make sure that size is aligned |
| 0 | 181 size = align_size_up(size, alignment); |
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182 base = os::reserve_memory_aligned(size, alignment); |
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183 |
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184 if (requested_address != 0 && |
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185 failed_to_reserve_as_requested(base, requested_address, size, false)) { |
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186 // As a result of the alignment constraints, the allocated base differs |
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187 // from the requested address. Return back to the caller who can |
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188 // take remedial action (like try again without a requested address). |
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189 assert(_base == NULL, "should be"); |
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190 return; |
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191 } |
| 0 | 192 } |
| 193 } | |
| 194 // Done | |
| 195 _base = base; | |
| 196 _size = size; | |
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197 _alignment = alignment; |
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198 _noaccess_prefix = noaccess_prefix; |
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199 |
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200 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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201 assert(noaccess_prefix == 0 || |
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202 noaccess_prefix == _alignment, "noaccess prefix wrong"); |
| 0 | 203 |
| 204 assert(markOopDesc::encode_pointer_as_mark(_base)->decode_pointer() == _base, | |
| 205 "area must be distinguisable from marks for mark-sweep"); | |
| 206 assert(markOopDesc::encode_pointer_as_mark(&_base[size])->decode_pointer() == &_base[size], | |
| 207 "area must be distinguisable from marks for mark-sweep"); | |
| 208 } | |
| 209 | |
| 210 | |
| 211 ReservedSpace::ReservedSpace(char* base, size_t size, size_t alignment, | |
| 656 | 212 bool special, bool executable) { |
| 0 | 213 assert((size % os::vm_allocation_granularity()) == 0, |
| 214 "size not allocation aligned"); | |
| 215 _base = base; | |
| 216 _size = size; | |
| 217 _alignment = alignment; | |
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218 _noaccess_prefix = 0; |
| 0 | 219 _special = special; |
| 656 | 220 _executable = executable; |
| 0 | 221 } |
| 222 | |
| 223 | |
| 224 ReservedSpace ReservedSpace::first_part(size_t partition_size, size_t alignment, | |
| 225 bool split, bool realloc) { | |
| 226 assert(partition_size <= size(), "partition failed"); | |
| 227 if (split) { | |
| 656 | 228 os::split_reserved_memory(base(), size(), partition_size, realloc); |
| 0 | 229 } |
| 656 | 230 ReservedSpace result(base(), partition_size, alignment, special(), |
| 231 executable()); | |
| 0 | 232 return result; |
| 233 } | |
| 234 | |
| 235 | |
| 236 ReservedSpace | |
| 237 ReservedSpace::last_part(size_t partition_size, size_t alignment) { | |
| 238 assert(partition_size <= size(), "partition failed"); | |
| 239 ReservedSpace result(base() + partition_size, size() - partition_size, | |
| 656 | 240 alignment, special(), executable()); |
| 0 | 241 return result; |
| 242 } | |
| 243 | |
| 244 | |
| 245 size_t ReservedSpace::page_align_size_up(size_t size) { | |
| 246 return align_size_up(size, os::vm_page_size()); | |
| 247 } | |
| 248 | |
| 249 | |
| 250 size_t ReservedSpace::page_align_size_down(size_t size) { | |
| 251 return align_size_down(size, os::vm_page_size()); | |
| 252 } | |
| 253 | |
| 254 | |
| 255 size_t ReservedSpace::allocation_align_size_up(size_t size) { | |
| 256 return align_size_up(size, os::vm_allocation_granularity()); | |
| 257 } | |
| 258 | |
| 259 | |
| 260 size_t ReservedSpace::allocation_align_size_down(size_t size) { | |
| 261 return align_size_down(size, os::vm_allocation_granularity()); | |
| 262 } | |
| 263 | |
| 264 | |
| 265 void ReservedSpace::release() { | |
| 266 if (is_reserved()) { | |
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267 char *real_base = _base - _noaccess_prefix; |
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268 const size_t real_size = _size + _noaccess_prefix; |
| 0 | 269 if (special()) { |
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270 os::release_memory_special(real_base, real_size); |
| 0 | 271 } else{ |
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272 os::release_memory(real_base, real_size); |
| 0 | 273 } |
| 274 _base = NULL; | |
| 275 _size = 0; | |
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276 _noaccess_prefix = 0; |
| 0 | 277 _special = false; |
| 656 | 278 _executable = false; |
| 0 | 279 } |
| 280 } | |
| 281 | |
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282 void ReservedSpace::protect_noaccess_prefix(const size_t size) { |
| 1618 | 283 assert( (_noaccess_prefix != 0) == (UseCompressedOops && _base != NULL && |
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284 (Universe::narrow_oop_base() != NULL) && |
| 1618 | 285 Universe::narrow_oop_use_implicit_null_checks()), |
| 286 "noaccess_prefix should be used only with non zero based compressed oops"); | |
| 287 | |
| 288 // If there is no noaccess prefix, return. | |
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289 if (_noaccess_prefix == 0) return; |
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290 |
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291 assert(_noaccess_prefix >= (size_t)os::vm_page_size(), |
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292 "must be at least page size big"); |
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293 |
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294 // Protect memory at the base of the allocated region. |
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295 // If special, the page was committed (only matters on windows) |
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296 if (!os::protect_memory(_base, _noaccess_prefix, os::MEM_PROT_NONE, |
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297 _special)) { |
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298 fatal("cannot protect protection page"); |
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299 } |
| 1618 | 300 if (PrintCompressedOopsMode) { |
| 301 tty->cr(); | |
| 302 tty->print_cr("Protected page at the reserved heap base: " PTR_FORMAT " / " INTX_FORMAT " bytes", _base, _noaccess_prefix); | |
| 303 } | |
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304 |
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305 _base += _noaccess_prefix; |
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306 _size -= _noaccess_prefix; |
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307 assert((size == _size) && ((uintptr_t)_base % _alignment == 0), |
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308 "must be exactly of required size and alignment"); |
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309 } |
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310 |
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311 ReservedHeapSpace::ReservedHeapSpace(size_t size, size_t alignment, |
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312 bool large, char* requested_address) : |
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313 ReservedSpace(size, alignment, large, |
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314 requested_address, |
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315 (UseCompressedOops && (Universe::narrow_oop_base() != NULL) && |
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316 Universe::narrow_oop_use_implicit_null_checks()) ? |
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325
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317 lcm(os::vm_page_size(), alignment) : 0) { |
| 6197 | 318 if (base() > 0) { |
| 319 MemTracker::record_virtual_memory_type((address)base(), mtJavaHeap); | |
| 320 } | |
| 321 | |
|
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322 // Only reserved space for the java heap should have a noaccess_prefix |
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323 // if using compressed oops. |
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324 protect_noaccess_prefix(size); |
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325 } |
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326 |
| 656 | 327 // Reserve space for code segment. Same as Java heap only we mark this as |
| 328 // executable. | |
| 329 ReservedCodeSpace::ReservedCodeSpace(size_t r_size, | |
| 330 size_t rs_align, | |
| 331 bool large) : | |
| 332 ReservedSpace(r_size, rs_align, large, /*executable*/ true) { | |
| 6197 | 333 MemTracker::record_virtual_memory_type((address)base(), mtCode); |
| 656 | 334 } |
| 335 | |
| 0 | 336 // VirtualSpace |
| 337 | |
| 338 VirtualSpace::VirtualSpace() { | |
| 339 _low_boundary = NULL; | |
| 340 _high_boundary = NULL; | |
| 341 _low = NULL; | |
| 342 _high = NULL; | |
| 343 _lower_high = NULL; | |
| 344 _middle_high = NULL; | |
| 345 _upper_high = NULL; | |
| 346 _lower_high_boundary = NULL; | |
| 347 _middle_high_boundary = NULL; | |
| 348 _upper_high_boundary = NULL; | |
| 349 _lower_alignment = 0; | |
| 350 _middle_alignment = 0; | |
| 351 _upper_alignment = 0; | |
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352 _special = false; |
| 656 | 353 _executable = false; |
| 0 | 354 } |
| 355 | |
| 356 | |
| 357 bool VirtualSpace::initialize(ReservedSpace rs, size_t committed_size) { | |
| 358 if(!rs.is_reserved()) return false; // allocation failed. | |
| 359 assert(_low_boundary == NULL, "VirtualSpace already initialized"); | |
| 360 _low_boundary = rs.base(); | |
| 361 _high_boundary = low_boundary() + rs.size(); | |
| 362 | |
| 363 _low = low_boundary(); | |
| 364 _high = low(); | |
| 365 | |
| 366 _special = rs.special(); | |
| 656 | 367 _executable = rs.executable(); |
| 0 | 368 |
| 369 // When a VirtualSpace begins life at a large size, make all future expansion | |
| 370 // and shrinking occur aligned to a granularity of large pages. This avoids | |
| 371 // fragmentation of physical addresses that inhibits the use of large pages | |
| 372 // by the OS virtual memory system. Empirically, we see that with a 4MB | |
| 373 // page size, the only spaces that get handled this way are codecache and | |
| 374 // the heap itself, both of which provide a substantial performance | |
| 375 // boost in many benchmarks when covered by large pages. | |
| 376 // | |
| 377 // No attempt is made to force large page alignment at the very top and | |
| 378 // bottom of the space if they are not aligned so already. | |
| 379 _lower_alignment = os::vm_page_size(); | |
| 380 _middle_alignment = os::page_size_for_region(rs.size(), rs.size(), 1); | |
| 381 _upper_alignment = os::vm_page_size(); | |
| 382 | |
| 383 // End of each region | |
| 384 _lower_high_boundary = (char*) round_to((intptr_t) low_boundary(), middle_alignment()); | |
| 385 _middle_high_boundary = (char*) round_down((intptr_t) high_boundary(), middle_alignment()); | |
| 386 _upper_high_boundary = high_boundary(); | |
| 387 | |
| 388 // High address of each region | |
| 389 _lower_high = low_boundary(); | |
| 390 _middle_high = lower_high_boundary(); | |
| 391 _upper_high = middle_high_boundary(); | |
| 392 | |
| 393 // commit to initial size | |
| 394 if (committed_size > 0) { | |
| 395 if (!expand_by(committed_size)) { | |
| 396 return false; | |
| 397 } | |
| 398 } | |
| 399 return true; | |
| 400 } | |
| 401 | |
| 402 | |
| 403 VirtualSpace::~VirtualSpace() { | |
| 404 release(); | |
| 405 } | |
| 406 | |
| 407 | |
| 408 void VirtualSpace::release() { | |
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409 // This does not release memory it never reserved. |
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410 // Caller must release via rs.release(); |
| 0 | 411 _low_boundary = NULL; |
| 412 _high_boundary = NULL; | |
| 413 _low = NULL; | |
| 414 _high = NULL; | |
| 415 _lower_high = NULL; | |
| 416 _middle_high = NULL; | |
| 417 _upper_high = NULL; | |
| 418 _lower_high_boundary = NULL; | |
| 419 _middle_high_boundary = NULL; | |
| 420 _upper_high_boundary = NULL; | |
| 421 _lower_alignment = 0; | |
| 422 _middle_alignment = 0; | |
| 423 _upper_alignment = 0; | |
| 424 _special = false; | |
| 656 | 425 _executable = false; |
| 0 | 426 } |
| 427 | |
| 428 | |
| 429 size_t VirtualSpace::committed_size() const { | |
| 430 return pointer_delta(high(), low(), sizeof(char)); | |
| 431 } | |
| 432 | |
| 433 | |
| 434 size_t VirtualSpace::reserved_size() const { | |
| 435 return pointer_delta(high_boundary(), low_boundary(), sizeof(char)); | |
| 436 } | |
| 437 | |
| 438 | |
| 439 size_t VirtualSpace::uncommitted_size() const { | |
| 440 return reserved_size() - committed_size(); | |
| 441 } | |
| 442 | |
| 443 | |
| 444 bool VirtualSpace::contains(const void* p) const { | |
| 445 return low() <= (const char*) p && (const char*) p < high(); | |
| 446 } | |
| 447 | |
| 448 /* | |
| 449 First we need to determine if a particular virtual space is using large | |
| 450 pages. This is done at the initialize function and only virtual spaces | |
| 451 that are larger than LargePageSizeInBytes use large pages. Once we | |
| 452 have determined this, all expand_by and shrink_by calls must grow and | |
| 453 shrink by large page size chunks. If a particular request | |
| 454 is within the current large page, the call to commit and uncommit memory | |
| 455 can be ignored. In the case that the low and high boundaries of this | |
| 456 space is not large page aligned, the pages leading to the first large | |
| 457 page address and the pages after the last large page address must be | |
| 458 allocated with default pages. | |
| 459 */ | |
| 460 bool VirtualSpace::expand_by(size_t bytes, bool pre_touch) { | |
| 461 if (uncommitted_size() < bytes) return false; | |
| 462 | |
| 463 if (special()) { | |
| 464 // don't commit memory if the entire space is pinned in memory | |
| 465 _high += bytes; | |
| 466 return true; | |
| 467 } | |
| 468 | |
| 469 char* previous_high = high(); | |
| 470 char* unaligned_new_high = high() + bytes; | |
| 471 assert(unaligned_new_high <= high_boundary(), | |
| 472 "cannot expand by more than upper boundary"); | |
| 473 | |
| 474 // Calculate where the new high for each of the regions should be. If | |
| 475 // the low_boundary() and high_boundary() are LargePageSizeInBytes aligned | |
| 476 // then the unaligned lower and upper new highs would be the | |
| 477 // lower_high() and upper_high() respectively. | |
| 478 char* unaligned_lower_new_high = | |
| 479 MIN2(unaligned_new_high, lower_high_boundary()); | |
| 480 char* unaligned_middle_new_high = | |
| 481 MIN2(unaligned_new_high, middle_high_boundary()); | |
| 482 char* unaligned_upper_new_high = | |
| 483 MIN2(unaligned_new_high, upper_high_boundary()); | |
| 484 | |
| 485 // Align the new highs based on the regions alignment. lower and upper | |
| 486 // alignment will always be default page size. middle alignment will be | |
| 487 // LargePageSizeInBytes if the actual size of the virtual space is in | |
| 488 // fact larger than LargePageSizeInBytes. | |
| 489 char* aligned_lower_new_high = | |
| 490 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
| 491 char* aligned_middle_new_high = | |
| 492 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
| 493 char* aligned_upper_new_high = | |
| 494 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
| 495 | |
| 496 // Determine which regions need to grow in this expand_by call. | |
| 497 // If you are growing in the lower region, high() must be in that | |
| 498 // region so calcuate the size based on high(). For the middle and | |
| 499 // upper regions, determine the starting point of growth based on the | |
| 500 // location of high(). By getting the MAX of the region's low address | |
| 501 // (or the prevoius region's high address) and high(), we can tell if it | |
| 502 // is an intra or inter region growth. | |
| 503 size_t lower_needs = 0; | |
| 504 if (aligned_lower_new_high > lower_high()) { | |
| 505 lower_needs = | |
| 506 pointer_delta(aligned_lower_new_high, lower_high(), sizeof(char)); | |
| 507 } | |
| 508 size_t middle_needs = 0; | |
| 509 if (aligned_middle_new_high > middle_high()) { | |
| 510 middle_needs = | |
| 511 pointer_delta(aligned_middle_new_high, middle_high(), sizeof(char)); | |
| 512 } | |
| 513 size_t upper_needs = 0; | |
| 514 if (aligned_upper_new_high > upper_high()) { | |
| 515 upper_needs = | |
| 516 pointer_delta(aligned_upper_new_high, upper_high(), sizeof(char)); | |
| 517 } | |
| 518 | |
| 519 // Check contiguity. | |
| 520 assert(low_boundary() <= lower_high() && | |
| 521 lower_high() <= lower_high_boundary(), | |
| 522 "high address must be contained within the region"); | |
| 523 assert(lower_high_boundary() <= middle_high() && | |
| 524 middle_high() <= middle_high_boundary(), | |
| 525 "high address must be contained within the region"); | |
| 526 assert(middle_high_boundary() <= upper_high() && | |
| 527 upper_high() <= upper_high_boundary(), | |
| 528 "high address must be contained within the region"); | |
| 529 | |
| 530 // Commit regions | |
| 531 if (lower_needs > 0) { | |
| 532 assert(low_boundary() <= lower_high() && | |
| 533 lower_high() + lower_needs <= lower_high_boundary(), | |
| 534 "must not expand beyond region"); | |
| 656 | 535 if (!os::commit_memory(lower_high(), lower_needs, _executable)) { |
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536 debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT |
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537 ", lower_needs=" SIZE_FORMAT ", %d) failed", |
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538 lower_high(), lower_needs, _executable);) |
| 0 | 539 return false; |
| 540 } else { | |
| 541 _lower_high += lower_needs; | |
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542 } |
| 0 | 543 } |
| 544 if (middle_needs > 0) { | |
| 545 assert(lower_high_boundary() <= middle_high() && | |
| 546 middle_high() + middle_needs <= middle_high_boundary(), | |
| 547 "must not expand beyond region"); | |
| 656 | 548 if (!os::commit_memory(middle_high(), middle_needs, middle_alignment(), |
| 549 _executable)) { | |
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550 debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT |
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551 ", middle_needs=" SIZE_FORMAT ", " SIZE_FORMAT |
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552 ", %d) failed", middle_high(), middle_needs, |
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553 middle_alignment(), _executable);) |
| 0 | 554 return false; |
| 555 } | |
| 556 _middle_high += middle_needs; | |
| 557 } | |
| 558 if (upper_needs > 0) { | |
| 559 assert(middle_high_boundary() <= upper_high() && | |
| 560 upper_high() + upper_needs <= upper_high_boundary(), | |
| 561 "must not expand beyond region"); | |
| 656 | 562 if (!os::commit_memory(upper_high(), upper_needs, _executable)) { |
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563 debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT |
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564 ", upper_needs=" SIZE_FORMAT ", %d) failed", |
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565 upper_high(), upper_needs, _executable);) |
| 0 | 566 return false; |
| 567 } else { | |
| 568 _upper_high += upper_needs; | |
| 569 } | |
| 570 } | |
| 571 | |
| 572 if (pre_touch || AlwaysPreTouch) { | |
| 573 int vm_ps = os::vm_page_size(); | |
| 574 for (char* curr = previous_high; | |
| 575 curr < unaligned_new_high; | |
| 576 curr += vm_ps) { | |
| 577 // Note the use of a write here; originally we tried just a read, but | |
| 578 // since the value read was unused, the optimizer removed the read. | |
| 579 // If we ever have a concurrent touchahead thread, we'll want to use | |
| 580 // a read, to avoid the potential of overwriting data (if a mutator | |
| 581 // thread beats the touchahead thread to a page). There are various | |
| 582 // ways of making sure this read is not optimized away: for example, | |
| 583 // generating the code for a read procedure at runtime. | |
| 584 *curr = 0; | |
| 585 } | |
| 586 } | |
| 587 | |
| 588 _high += bytes; | |
| 589 return true; | |
| 590 } | |
| 591 | |
| 592 // A page is uncommitted if the contents of the entire page is deemed unusable. | |
| 593 // Continue to decrement the high() pointer until it reaches a page boundary | |
| 594 // in which case that particular page can now be uncommitted. | |
| 595 void VirtualSpace::shrink_by(size_t size) { | |
| 596 if (committed_size() < size) | |
| 597 fatal("Cannot shrink virtual space to negative size"); | |
| 598 | |
| 599 if (special()) { | |
| 600 // don't uncommit if the entire space is pinned in memory | |
| 601 _high -= size; | |
| 602 return; | |
| 603 } | |
| 604 | |
| 605 char* unaligned_new_high = high() - size; | |
| 606 assert(unaligned_new_high >= low_boundary(), "cannot shrink past lower boundary"); | |
| 607 | |
| 608 // Calculate new unaligned address | |
| 609 char* unaligned_upper_new_high = | |
| 610 MAX2(unaligned_new_high, middle_high_boundary()); | |
| 611 char* unaligned_middle_new_high = | |
| 612 MAX2(unaligned_new_high, lower_high_boundary()); | |
| 613 char* unaligned_lower_new_high = | |
| 614 MAX2(unaligned_new_high, low_boundary()); | |
| 615 | |
| 616 // Align address to region's alignment | |
| 617 char* aligned_upper_new_high = | |
| 618 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
| 619 char* aligned_middle_new_high = | |
| 620 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
| 621 char* aligned_lower_new_high = | |
| 622 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
| 623 | |
| 624 // Determine which regions need to shrink | |
| 625 size_t upper_needs = 0; | |
| 626 if (aligned_upper_new_high < upper_high()) { | |
| 627 upper_needs = | |
| 628 pointer_delta(upper_high(), aligned_upper_new_high, sizeof(char)); | |
| 629 } | |
| 630 size_t middle_needs = 0; | |
| 631 if (aligned_middle_new_high < middle_high()) { | |
| 632 middle_needs = | |
| 633 pointer_delta(middle_high(), aligned_middle_new_high, sizeof(char)); | |
| 634 } | |
| 635 size_t lower_needs = 0; | |
| 636 if (aligned_lower_new_high < lower_high()) { | |
| 637 lower_needs = | |
| 638 pointer_delta(lower_high(), aligned_lower_new_high, sizeof(char)); | |
| 639 } | |
| 640 | |
| 641 // Check contiguity. | |
| 642 assert(middle_high_boundary() <= upper_high() && | |
| 643 upper_high() <= upper_high_boundary(), | |
| 644 "high address must be contained within the region"); | |
| 645 assert(lower_high_boundary() <= middle_high() && | |
| 646 middle_high() <= middle_high_boundary(), | |
| 647 "high address must be contained within the region"); | |
| 648 assert(low_boundary() <= lower_high() && | |
| 649 lower_high() <= lower_high_boundary(), | |
| 650 "high address must be contained within the region"); | |
| 651 | |
| 652 // Uncommit | |
| 653 if (upper_needs > 0) { | |
| 654 assert(middle_high_boundary() <= aligned_upper_new_high && | |
| 655 aligned_upper_new_high + upper_needs <= upper_high_boundary(), | |
| 656 "must not shrink beyond region"); | |
| 657 if (!os::uncommit_memory(aligned_upper_new_high, upper_needs)) { | |
| 658 debug_only(warning("os::uncommit_memory failed")); | |
| 659 return; | |
| 660 } else { | |
| 661 _upper_high -= upper_needs; | |
| 662 } | |
| 663 } | |
| 664 if (middle_needs > 0) { | |
| 665 assert(lower_high_boundary() <= aligned_middle_new_high && | |
| 666 aligned_middle_new_high + middle_needs <= middle_high_boundary(), | |
| 667 "must not shrink beyond region"); | |
| 668 if (!os::uncommit_memory(aligned_middle_new_high, middle_needs)) { | |
| 669 debug_only(warning("os::uncommit_memory failed")); | |
| 670 return; | |
| 671 } else { | |
| 672 _middle_high -= middle_needs; | |
| 673 } | |
| 674 } | |
| 675 if (lower_needs > 0) { | |
| 676 assert(low_boundary() <= aligned_lower_new_high && | |
| 677 aligned_lower_new_high + lower_needs <= lower_high_boundary(), | |
| 678 "must not shrink beyond region"); | |
| 679 if (!os::uncommit_memory(aligned_lower_new_high, lower_needs)) { | |
| 680 debug_only(warning("os::uncommit_memory failed")); | |
| 681 return; | |
| 682 } else { | |
| 683 _lower_high -= lower_needs; | |
| 684 } | |
| 685 } | |
| 686 | |
| 687 _high -= size; | |
| 688 } | |
| 689 | |
| 690 #ifndef PRODUCT | |
| 691 void VirtualSpace::check_for_contiguity() { | |
| 692 // Check contiguity. | |
| 693 assert(low_boundary() <= lower_high() && | |
| 694 lower_high() <= lower_high_boundary(), | |
| 695 "high address must be contained within the region"); | |
| 696 assert(lower_high_boundary() <= middle_high() && | |
| 697 middle_high() <= middle_high_boundary(), | |
| 698 "high address must be contained within the region"); | |
| 699 assert(middle_high_boundary() <= upper_high() && | |
| 700 upper_high() <= upper_high_boundary(), | |
| 701 "high address must be contained within the region"); | |
| 702 assert(low() >= low_boundary(), "low"); | |
| 703 assert(low_boundary() <= lower_high_boundary(), "lower high boundary"); | |
| 704 assert(upper_high_boundary() <= high_boundary(), "upper high boundary"); | |
| 705 assert(high() <= upper_high(), "upper high"); | |
| 706 } | |
| 707 | |
| 708 void VirtualSpace::print() { | |
| 709 tty->print ("Virtual space:"); | |
| 710 if (special()) tty->print(" (pinned in memory)"); | |
| 711 tty->cr(); | |
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712 tty->print_cr(" - committed: " SIZE_FORMAT, committed_size()); |
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713 tty->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); |
| 0 | 714 tty->print_cr(" - [low, high]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low(), high()); |
| 715 tty->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low_boundary(), high_boundary()); | |
| 716 } | |
| 717 | |
| 718 #endif |