Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/virtualspace.cpp @ 12110:4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso
| author | stefank |
|---|---|
| date | Fri, 16 Aug 2013 13:22:32 +0200 |
| parents | a837fa3d3f86 |
| children | c4c768305a8f e2722a66aba7 |
| 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 | |
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45 |
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46 // Dummy constructor |
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47 ReservedSpace::ReservedSpace() : _base(NULL), _size(0), _noaccess_prefix(0), |
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48 _alignment(0), _special(false), _executable(false) { |
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49 } |
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50 |
| 0 | 51 ReservedSpace::ReservedSpace(size_t size) { |
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52 size_t page_size = os::page_size_for_region(size, size, 1); |
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53 bool large_pages = page_size != (size_t)os::vm_page_size(); |
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54 // Don't force the alignment to be large page aligned, |
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55 // since that will waste memory. |
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56 size_t alignment = os::vm_allocation_granularity(); |
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57 initialize(size, alignment, large_pages, NULL, 0, false); |
| 0 | 58 } |
| 59 | |
| 60 ReservedSpace::ReservedSpace(size_t size, size_t alignment, | |
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61 bool large, |
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62 char* requested_address, |
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63 const size_t noaccess_prefix) { |
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64 initialize(size+noaccess_prefix, alignment, large, requested_address, |
| 656 | 65 noaccess_prefix, false); |
| 66 } | |
| 67 | |
| 68 ReservedSpace::ReservedSpace(size_t size, size_t alignment, | |
| 69 bool large, | |
| 70 bool executable) { | |
| 71 initialize(size, alignment, large, NULL, 0, executable); | |
| 0 | 72 } |
| 73 | |
| 1618 | 74 // Helper method. |
| 75 static bool failed_to_reserve_as_requested(char* base, char* requested_address, | |
| 76 const size_t size, bool special) | |
| 77 { | |
| 78 if (base == requested_address || requested_address == NULL) | |
| 79 return false; // did not fail | |
| 80 | |
| 81 if (base != NULL) { | |
| 82 // Different reserve address may be acceptable in other cases | |
| 83 // but for compressed oops heap should be at requested address. | |
| 84 assert(UseCompressedOops, "currently requested address used only for compressed oops"); | |
| 85 if (PrintCompressedOopsMode) { | |
| 86 tty->cr(); | |
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87 tty->print_cr("Reserved memory not at requested address: " PTR_FORMAT " vs " PTR_FORMAT, base, requested_address); |
| 1618 | 88 } |
| 89 // OS ignored requested address. Try different address. | |
| 90 if (special) { | |
| 91 if (!os::release_memory_special(base, size)) { | |
| 92 fatal("os::release_memory_special failed"); | |
| 93 } | |
| 94 } else { | |
| 95 if (!os::release_memory(base, size)) { | |
| 96 fatal("os::release_memory failed"); | |
| 97 } | |
| 98 } | |
| 99 } | |
| 100 return true; | |
| 101 } | |
| 102 | |
| 0 | 103 void ReservedSpace::initialize(size_t size, size_t alignment, bool large, |
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104 char* requested_address, |
| 656 | 105 const size_t noaccess_prefix, |
| 106 bool executable) { | |
| 0 | 107 const size_t granularity = os::vm_allocation_granularity(); |
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108 assert((size & (granularity - 1)) == 0, |
| 0 | 109 "size not aligned to os::vm_allocation_granularity()"); |
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110 assert((alignment & (granularity - 1)) == 0, |
| 0 | 111 "alignment not aligned to os::vm_allocation_granularity()"); |
| 112 assert(alignment == 0 || is_power_of_2((intptr_t)alignment), | |
| 113 "not a power of 2"); | |
| 114 | |
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115 alignment = MAX2(alignment, (size_t)os::vm_page_size()); |
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116 |
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117 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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118 assert(noaccess_prefix == 0 || |
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119 noaccess_prefix == alignment, "noaccess prefix wrong"); |
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120 |
| 0 | 121 _base = NULL; |
| 122 _size = 0; | |
| 123 _special = false; | |
| 656 | 124 _executable = executable; |
| 0 | 125 _alignment = 0; |
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126 _noaccess_prefix = 0; |
| 0 | 127 if (size == 0) { |
| 128 return; | |
| 129 } | |
| 130 | |
| 131 // If OS doesn't support demand paging for large page memory, we need | |
| 132 // to use reserve_memory_special() to reserve and pin the entire region. | |
| 133 bool special = large && !os::can_commit_large_page_memory(); | |
| 134 char* base = NULL; | |
| 135 | |
| 1618 | 136 if (requested_address != 0) { |
| 137 requested_address -= noaccess_prefix; // adjust requested address | |
| 138 assert(requested_address != NULL, "huge noaccess prefix?"); | |
| 139 } | |
| 140 | |
| 0 | 141 if (special) { |
| 142 | |
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143 base = os::reserve_memory_special(size, alignment, requested_address, executable); |
| 0 | 144 |
| 145 if (base != NULL) { | |
| 1618 | 146 if (failed_to_reserve_as_requested(base, requested_address, size, true)) { |
| 147 // OS ignored requested address. Try different address. | |
| 148 return; | |
| 149 } | |
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150 // Check alignment constraints. |
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151 assert((uintptr_t) base % alignment == 0, |
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152 err_msg("Large pages returned a non-aligned address, base: " |
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153 PTR_FORMAT " alignment: " PTR_FORMAT, |
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154 base, (void*)(uintptr_t)alignment)); |
| 0 | 155 _special = true; |
| 156 } else { | |
| 157 // failed; try to reserve regular memory below | |
| 1618 | 158 if (UseLargePages && (!FLAG_IS_DEFAULT(UseLargePages) || |
| 159 !FLAG_IS_DEFAULT(LargePageSizeInBytes))) { | |
| 160 if (PrintCompressedOopsMode) { | |
| 161 tty->cr(); | |
| 162 tty->print_cr("Reserve regular memory without large pages."); | |
| 163 } | |
| 164 } | |
| 0 | 165 } |
| 166 } | |
| 167 | |
| 168 if (base == NULL) { | |
| 169 // Optimistically assume that the OSes returns an aligned base pointer. | |
| 170 // When reserving a large address range, most OSes seem to align to at | |
| 171 // least 64K. | |
| 172 | |
| 173 // If the memory was requested at a particular address, use | |
| 174 // os::attempt_reserve_memory_at() to avoid over mapping something | |
| 175 // important. If available space is not detected, return NULL. | |
| 176 | |
| 177 if (requested_address != 0) { | |
| 1618 | 178 base = os::attempt_reserve_memory_at(size, requested_address); |
| 179 if (failed_to_reserve_as_requested(base, requested_address, size, false)) { | |
| 180 // OS ignored requested address. Try different address. | |
| 181 base = NULL; | |
| 182 } | |
| 0 | 183 } else { |
| 184 base = os::reserve_memory(size, NULL, alignment); | |
| 185 } | |
| 186 | |
| 187 if (base == NULL) return; | |
| 188 | |
| 189 // Check alignment constraints | |
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190 if ((((size_t)base + noaccess_prefix) & (alignment - 1)) != 0) { |
| 0 | 191 // Base not aligned, retry |
| 192 if (!os::release_memory(base, size)) fatal("os::release_memory failed"); | |
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193 // Make sure that size is aligned |
| 0 | 194 size = align_size_up(size, alignment); |
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195 base = os::reserve_memory_aligned(size, alignment); |
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196 |
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197 if (requested_address != 0 && |
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198 failed_to_reserve_as_requested(base, requested_address, size, false)) { |
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199 // As a result of the alignment constraints, the allocated base differs |
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200 // from the requested address. Return back to the caller who can |
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201 // take remedial action (like try again without a requested address). |
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202 assert(_base == NULL, "should be"); |
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203 return; |
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204 } |
| 0 | 205 } |
| 206 } | |
| 207 // Done | |
| 208 _base = base; | |
| 209 _size = size; | |
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210 _alignment = alignment; |
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211 _noaccess_prefix = noaccess_prefix; |
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212 |
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213 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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214 assert(noaccess_prefix == 0 || |
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215 noaccess_prefix == _alignment, "noaccess prefix wrong"); |
| 0 | 216 |
| 217 assert(markOopDesc::encode_pointer_as_mark(_base)->decode_pointer() == _base, | |
| 218 "area must be distinguisable from marks for mark-sweep"); | |
| 219 assert(markOopDesc::encode_pointer_as_mark(&_base[size])->decode_pointer() == &_base[size], | |
| 220 "area must be distinguisable from marks for mark-sweep"); | |
| 221 } | |
| 222 | |
| 223 | |
| 224 ReservedSpace::ReservedSpace(char* base, size_t size, size_t alignment, | |
| 656 | 225 bool special, bool executable) { |
| 0 | 226 assert((size % os::vm_allocation_granularity()) == 0, |
| 227 "size not allocation aligned"); | |
| 228 _base = base; | |
| 229 _size = size; | |
| 230 _alignment = alignment; | |
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231 _noaccess_prefix = 0; |
| 0 | 232 _special = special; |
| 656 | 233 _executable = executable; |
| 0 | 234 } |
| 235 | |
| 236 | |
| 237 ReservedSpace ReservedSpace::first_part(size_t partition_size, size_t alignment, | |
| 238 bool split, bool realloc) { | |
| 239 assert(partition_size <= size(), "partition failed"); | |
| 240 if (split) { | |
| 656 | 241 os::split_reserved_memory(base(), size(), partition_size, realloc); |
| 0 | 242 } |
| 656 | 243 ReservedSpace result(base(), partition_size, alignment, special(), |
| 244 executable()); | |
| 0 | 245 return result; |
| 246 } | |
| 247 | |
| 248 | |
| 249 ReservedSpace | |
| 250 ReservedSpace::last_part(size_t partition_size, size_t alignment) { | |
| 251 assert(partition_size <= size(), "partition failed"); | |
| 252 ReservedSpace result(base() + partition_size, size() - partition_size, | |
| 656 | 253 alignment, special(), executable()); |
| 0 | 254 return result; |
| 255 } | |
| 256 | |
| 257 | |
| 258 size_t ReservedSpace::page_align_size_up(size_t size) { | |
| 259 return align_size_up(size, os::vm_page_size()); | |
| 260 } | |
| 261 | |
| 262 | |
| 263 size_t ReservedSpace::page_align_size_down(size_t size) { | |
| 264 return align_size_down(size, os::vm_page_size()); | |
| 265 } | |
| 266 | |
| 267 | |
| 268 size_t ReservedSpace::allocation_align_size_up(size_t size) { | |
| 269 return align_size_up(size, os::vm_allocation_granularity()); | |
| 270 } | |
| 271 | |
| 272 | |
| 273 size_t ReservedSpace::allocation_align_size_down(size_t size) { | |
| 274 return align_size_down(size, os::vm_allocation_granularity()); | |
| 275 } | |
| 276 | |
| 277 | |
| 278 void ReservedSpace::release() { | |
| 279 if (is_reserved()) { | |
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280 char *real_base = _base - _noaccess_prefix; |
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281 const size_t real_size = _size + _noaccess_prefix; |
| 0 | 282 if (special()) { |
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283 os::release_memory_special(real_base, real_size); |
| 0 | 284 } else{ |
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285 os::release_memory(real_base, real_size); |
| 0 | 286 } |
| 287 _base = NULL; | |
| 288 _size = 0; | |
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289 _noaccess_prefix = 0; |
| 0 | 290 _special = false; |
| 656 | 291 _executable = false; |
| 0 | 292 } |
| 293 } | |
| 294 | |
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295 void ReservedSpace::protect_noaccess_prefix(const size_t size) { |
| 1618 | 296 assert( (_noaccess_prefix != 0) == (UseCompressedOops && _base != NULL && |
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297 (Universe::narrow_oop_base() != NULL) && |
| 1618 | 298 Universe::narrow_oop_use_implicit_null_checks()), |
| 299 "noaccess_prefix should be used only with non zero based compressed oops"); | |
| 300 | |
| 301 // If there is no noaccess prefix, return. | |
|
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302 if (_noaccess_prefix == 0) return; |
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303 |
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304 assert(_noaccess_prefix >= (size_t)os::vm_page_size(), |
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305 "must be at least page size big"); |
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306 |
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307 // Protect memory at the base of the allocated region. |
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308 // If special, the page was committed (only matters on windows) |
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309 if (!os::protect_memory(_base, _noaccess_prefix, os::MEM_PROT_NONE, |
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310 _special)) { |
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311 fatal("cannot protect protection page"); |
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312 } |
| 1618 | 313 if (PrintCompressedOopsMode) { |
| 314 tty->cr(); | |
| 315 tty->print_cr("Protected page at the reserved heap base: " PTR_FORMAT " / " INTX_FORMAT " bytes", _base, _noaccess_prefix); | |
| 316 } | |
|
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317 |
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318 _base += _noaccess_prefix; |
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319 _size -= _noaccess_prefix; |
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320 assert((size == _size) && ((uintptr_t)_base % _alignment == 0), |
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321 "must be exactly of required size and alignment"); |
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322 } |
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323 |
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324 ReservedHeapSpace::ReservedHeapSpace(size_t size, size_t alignment, |
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325 bool large, char* requested_address) : |
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326 ReservedSpace(size, alignment, large, |
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327 requested_address, |
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328 (UseCompressedOops && (Universe::narrow_oop_base() != NULL) && |
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329 Universe::narrow_oop_use_implicit_null_checks()) ? |
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330 lcm(os::vm_page_size(), alignment) : 0) { |
| 6197 | 331 if (base() > 0) { |
| 332 MemTracker::record_virtual_memory_type((address)base(), mtJavaHeap); | |
| 333 } | |
| 334 | |
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335 // Only reserved space for the java heap should have a noaccess_prefix |
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336 // if using compressed oops. |
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337 protect_noaccess_prefix(size); |
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338 } |
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339 |
| 656 | 340 // Reserve space for code segment. Same as Java heap only we mark this as |
| 341 // executable. | |
| 342 ReservedCodeSpace::ReservedCodeSpace(size_t r_size, | |
| 343 size_t rs_align, | |
| 344 bool large) : | |
| 345 ReservedSpace(r_size, rs_align, large, /*executable*/ true) { | |
| 6197 | 346 MemTracker::record_virtual_memory_type((address)base(), mtCode); |
| 656 | 347 } |
| 348 | |
| 0 | 349 // VirtualSpace |
| 350 | |
| 351 VirtualSpace::VirtualSpace() { | |
| 352 _low_boundary = NULL; | |
| 353 _high_boundary = NULL; | |
| 354 _low = NULL; | |
| 355 _high = NULL; | |
| 356 _lower_high = NULL; | |
| 357 _middle_high = NULL; | |
| 358 _upper_high = NULL; | |
| 359 _lower_high_boundary = NULL; | |
| 360 _middle_high_boundary = NULL; | |
| 361 _upper_high_boundary = NULL; | |
| 362 _lower_alignment = 0; | |
| 363 _middle_alignment = 0; | |
| 364 _upper_alignment = 0; | |
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365 _special = false; |
| 656 | 366 _executable = false; |
| 0 | 367 } |
| 368 | |
| 369 | |
| 370 bool VirtualSpace::initialize(ReservedSpace rs, size_t committed_size) { | |
| 371 if(!rs.is_reserved()) return false; // allocation failed. | |
| 372 assert(_low_boundary == NULL, "VirtualSpace already initialized"); | |
| 373 _low_boundary = rs.base(); | |
| 374 _high_boundary = low_boundary() + rs.size(); | |
| 375 | |
| 376 _low = low_boundary(); | |
| 377 _high = low(); | |
| 378 | |
| 379 _special = rs.special(); | |
| 656 | 380 _executable = rs.executable(); |
| 0 | 381 |
| 382 // When a VirtualSpace begins life at a large size, make all future expansion | |
| 383 // and shrinking occur aligned to a granularity of large pages. This avoids | |
| 384 // fragmentation of physical addresses that inhibits the use of large pages | |
| 385 // by the OS virtual memory system. Empirically, we see that with a 4MB | |
| 386 // page size, the only spaces that get handled this way are codecache and | |
| 387 // the heap itself, both of which provide a substantial performance | |
| 388 // boost in many benchmarks when covered by large pages. | |
| 389 // | |
| 390 // No attempt is made to force large page alignment at the very top and | |
| 391 // bottom of the space if they are not aligned so already. | |
| 392 _lower_alignment = os::vm_page_size(); | |
| 393 _middle_alignment = os::page_size_for_region(rs.size(), rs.size(), 1); | |
| 394 _upper_alignment = os::vm_page_size(); | |
| 395 | |
| 396 // End of each region | |
| 397 _lower_high_boundary = (char*) round_to((intptr_t) low_boundary(), middle_alignment()); | |
| 398 _middle_high_boundary = (char*) round_down((intptr_t) high_boundary(), middle_alignment()); | |
| 399 _upper_high_boundary = high_boundary(); | |
| 400 | |
| 401 // High address of each region | |
| 402 _lower_high = low_boundary(); | |
| 403 _middle_high = lower_high_boundary(); | |
| 404 _upper_high = middle_high_boundary(); | |
| 405 | |
| 406 // commit to initial size | |
| 407 if (committed_size > 0) { | |
| 408 if (!expand_by(committed_size)) { | |
| 409 return false; | |
| 410 } | |
| 411 } | |
| 412 return true; | |
| 413 } | |
| 414 | |
| 415 | |
| 416 VirtualSpace::~VirtualSpace() { | |
| 417 release(); | |
| 418 } | |
| 419 | |
| 420 | |
| 421 void VirtualSpace::release() { | |
|
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422 // This does not release memory it never reserved. |
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423 // Caller must release via rs.release(); |
| 0 | 424 _low_boundary = NULL; |
| 425 _high_boundary = NULL; | |
| 426 _low = NULL; | |
| 427 _high = NULL; | |
| 428 _lower_high = NULL; | |
| 429 _middle_high = NULL; | |
| 430 _upper_high = NULL; | |
| 431 _lower_high_boundary = NULL; | |
| 432 _middle_high_boundary = NULL; | |
| 433 _upper_high_boundary = NULL; | |
| 434 _lower_alignment = 0; | |
| 435 _middle_alignment = 0; | |
| 436 _upper_alignment = 0; | |
| 437 _special = false; | |
| 656 | 438 _executable = false; |
| 0 | 439 } |
| 440 | |
| 441 | |
| 442 size_t VirtualSpace::committed_size() const { | |
| 443 return pointer_delta(high(), low(), sizeof(char)); | |
| 444 } | |
| 445 | |
| 446 | |
| 447 size_t VirtualSpace::reserved_size() const { | |
| 448 return pointer_delta(high_boundary(), low_boundary(), sizeof(char)); | |
| 449 } | |
| 450 | |
| 451 | |
| 452 size_t VirtualSpace::uncommitted_size() const { | |
| 453 return reserved_size() - committed_size(); | |
| 454 } | |
| 455 | |
| 456 | |
| 457 bool VirtualSpace::contains(const void* p) const { | |
| 458 return low() <= (const char*) p && (const char*) p < high(); | |
| 459 } | |
| 460 | |
| 461 /* | |
| 462 First we need to determine if a particular virtual space is using large | |
| 463 pages. This is done at the initialize function and only virtual spaces | |
| 464 that are larger than LargePageSizeInBytes use large pages. Once we | |
| 465 have determined this, all expand_by and shrink_by calls must grow and | |
| 466 shrink by large page size chunks. If a particular request | |
| 467 is within the current large page, the call to commit and uncommit memory | |
| 468 can be ignored. In the case that the low and high boundaries of this | |
| 469 space is not large page aligned, the pages leading to the first large | |
| 470 page address and the pages after the last large page address must be | |
| 471 allocated with default pages. | |
| 472 */ | |
| 473 bool VirtualSpace::expand_by(size_t bytes, bool pre_touch) { | |
| 474 if (uncommitted_size() < bytes) return false; | |
| 475 | |
| 476 if (special()) { | |
| 477 // don't commit memory if the entire space is pinned in memory | |
| 478 _high += bytes; | |
| 479 return true; | |
| 480 } | |
| 481 | |
| 482 char* previous_high = high(); | |
| 483 char* unaligned_new_high = high() + bytes; | |
| 484 assert(unaligned_new_high <= high_boundary(), | |
| 485 "cannot expand by more than upper boundary"); | |
| 486 | |
| 487 // Calculate where the new high for each of the regions should be. If | |
| 488 // the low_boundary() and high_boundary() are LargePageSizeInBytes aligned | |
| 489 // then the unaligned lower and upper new highs would be the | |
| 490 // lower_high() and upper_high() respectively. | |
| 491 char* unaligned_lower_new_high = | |
| 492 MIN2(unaligned_new_high, lower_high_boundary()); | |
| 493 char* unaligned_middle_new_high = | |
| 494 MIN2(unaligned_new_high, middle_high_boundary()); | |
| 495 char* unaligned_upper_new_high = | |
| 496 MIN2(unaligned_new_high, upper_high_boundary()); | |
| 497 | |
| 498 // Align the new highs based on the regions alignment. lower and upper | |
| 499 // alignment will always be default page size. middle alignment will be | |
| 500 // LargePageSizeInBytes if the actual size of the virtual space is in | |
| 501 // fact larger than LargePageSizeInBytes. | |
| 502 char* aligned_lower_new_high = | |
| 503 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
| 504 char* aligned_middle_new_high = | |
| 505 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
| 506 char* aligned_upper_new_high = | |
| 507 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
| 508 | |
| 509 // Determine which regions need to grow in this expand_by call. | |
| 510 // If you are growing in the lower region, high() must be in that | |
| 511 // region so calcuate the size based on high(). For the middle and | |
| 512 // upper regions, determine the starting point of growth based on the | |
| 513 // location of high(). By getting the MAX of the region's low address | |
| 514 // (or the prevoius region's high address) and high(), we can tell if it | |
| 515 // is an intra or inter region growth. | |
| 516 size_t lower_needs = 0; | |
| 517 if (aligned_lower_new_high > lower_high()) { | |
| 518 lower_needs = | |
| 519 pointer_delta(aligned_lower_new_high, lower_high(), sizeof(char)); | |
| 520 } | |
| 521 size_t middle_needs = 0; | |
| 522 if (aligned_middle_new_high > middle_high()) { | |
| 523 middle_needs = | |
| 524 pointer_delta(aligned_middle_new_high, middle_high(), sizeof(char)); | |
| 525 } | |
| 526 size_t upper_needs = 0; | |
| 527 if (aligned_upper_new_high > upper_high()) { | |
| 528 upper_needs = | |
| 529 pointer_delta(aligned_upper_new_high, upper_high(), sizeof(char)); | |
| 530 } | |
| 531 | |
| 532 // Check contiguity. | |
| 533 assert(low_boundary() <= lower_high() && | |
| 534 lower_high() <= lower_high_boundary(), | |
| 535 "high address must be contained within the region"); | |
| 536 assert(lower_high_boundary() <= middle_high() && | |
| 537 middle_high() <= middle_high_boundary(), | |
| 538 "high address must be contained within the region"); | |
| 539 assert(middle_high_boundary() <= upper_high() && | |
| 540 upper_high() <= upper_high_boundary(), | |
| 541 "high address must be contained within the region"); | |
| 542 | |
| 543 // Commit regions | |
| 544 if (lower_needs > 0) { | |
| 545 assert(low_boundary() <= lower_high() && | |
| 546 lower_high() + lower_needs <= lower_high_boundary(), | |
| 547 "must not expand beyond region"); | |
| 656 | 548 if (!os::commit_memory(lower_high(), lower_needs, _executable)) { |
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549 debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT |
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550 ", lower_needs=" SIZE_FORMAT ", %d) failed", |
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551 lower_high(), lower_needs, _executable);) |
| 0 | 552 return false; |
| 553 } else { | |
| 554 _lower_high += lower_needs; | |
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555 } |
| 0 | 556 } |
| 557 if (middle_needs > 0) { | |
| 558 assert(lower_high_boundary() <= middle_high() && | |
| 559 middle_high() + middle_needs <= middle_high_boundary(), | |
| 560 "must not expand beyond region"); | |
| 656 | 561 if (!os::commit_memory(middle_high(), middle_needs, middle_alignment(), |
| 562 _executable)) { | |
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563 debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT |
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564 ", middle_needs=" SIZE_FORMAT ", " SIZE_FORMAT |
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565 ", %d) failed", middle_high(), middle_needs, |
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566 middle_alignment(), _executable);) |
| 0 | 567 return false; |
| 568 } | |
| 569 _middle_high += middle_needs; | |
| 570 } | |
| 571 if (upper_needs > 0) { | |
| 572 assert(middle_high_boundary() <= upper_high() && | |
| 573 upper_high() + upper_needs <= upper_high_boundary(), | |
| 574 "must not expand beyond region"); | |
| 656 | 575 if (!os::commit_memory(upper_high(), upper_needs, _executable)) { |
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576 debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT |
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577 ", upper_needs=" SIZE_FORMAT ", %d) failed", |
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578 upper_high(), upper_needs, _executable);) |
| 0 | 579 return false; |
| 580 } else { | |
| 581 _upper_high += upper_needs; | |
| 582 } | |
| 583 } | |
| 584 | |
| 585 if (pre_touch || AlwaysPreTouch) { | |
| 586 int vm_ps = os::vm_page_size(); | |
| 587 for (char* curr = previous_high; | |
| 588 curr < unaligned_new_high; | |
| 589 curr += vm_ps) { | |
| 590 // Note the use of a write here; originally we tried just a read, but | |
| 591 // since the value read was unused, the optimizer removed the read. | |
| 592 // If we ever have a concurrent touchahead thread, we'll want to use | |
| 593 // a read, to avoid the potential of overwriting data (if a mutator | |
| 594 // thread beats the touchahead thread to a page). There are various | |
| 595 // ways of making sure this read is not optimized away: for example, | |
| 596 // generating the code for a read procedure at runtime. | |
| 597 *curr = 0; | |
| 598 } | |
| 599 } | |
| 600 | |
| 601 _high += bytes; | |
| 602 return true; | |
| 603 } | |
| 604 | |
| 605 // A page is uncommitted if the contents of the entire page is deemed unusable. | |
| 606 // Continue to decrement the high() pointer until it reaches a page boundary | |
| 607 // in which case that particular page can now be uncommitted. | |
| 608 void VirtualSpace::shrink_by(size_t size) { | |
| 609 if (committed_size() < size) | |
| 610 fatal("Cannot shrink virtual space to negative size"); | |
| 611 | |
| 612 if (special()) { | |
| 613 // don't uncommit if the entire space is pinned in memory | |
| 614 _high -= size; | |
| 615 return; | |
| 616 } | |
| 617 | |
| 618 char* unaligned_new_high = high() - size; | |
| 619 assert(unaligned_new_high >= low_boundary(), "cannot shrink past lower boundary"); | |
| 620 | |
| 621 // Calculate new unaligned address | |
| 622 char* unaligned_upper_new_high = | |
| 623 MAX2(unaligned_new_high, middle_high_boundary()); | |
| 624 char* unaligned_middle_new_high = | |
| 625 MAX2(unaligned_new_high, lower_high_boundary()); | |
| 626 char* unaligned_lower_new_high = | |
| 627 MAX2(unaligned_new_high, low_boundary()); | |
| 628 | |
| 629 // Align address to region's alignment | |
| 630 char* aligned_upper_new_high = | |
| 631 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
| 632 char* aligned_middle_new_high = | |
| 633 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
| 634 char* aligned_lower_new_high = | |
| 635 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
| 636 | |
| 637 // Determine which regions need to shrink | |
| 638 size_t upper_needs = 0; | |
| 639 if (aligned_upper_new_high < upper_high()) { | |
| 640 upper_needs = | |
| 641 pointer_delta(upper_high(), aligned_upper_new_high, sizeof(char)); | |
| 642 } | |
| 643 size_t middle_needs = 0; | |
| 644 if (aligned_middle_new_high < middle_high()) { | |
| 645 middle_needs = | |
| 646 pointer_delta(middle_high(), aligned_middle_new_high, sizeof(char)); | |
| 647 } | |
| 648 size_t lower_needs = 0; | |
| 649 if (aligned_lower_new_high < lower_high()) { | |
| 650 lower_needs = | |
| 651 pointer_delta(lower_high(), aligned_lower_new_high, sizeof(char)); | |
| 652 } | |
| 653 | |
| 654 // Check contiguity. | |
| 655 assert(middle_high_boundary() <= upper_high() && | |
| 656 upper_high() <= upper_high_boundary(), | |
| 657 "high address must be contained within the region"); | |
| 658 assert(lower_high_boundary() <= middle_high() && | |
| 659 middle_high() <= middle_high_boundary(), | |
| 660 "high address must be contained within the region"); | |
| 661 assert(low_boundary() <= lower_high() && | |
| 662 lower_high() <= lower_high_boundary(), | |
| 663 "high address must be contained within the region"); | |
| 664 | |
| 665 // Uncommit | |
| 666 if (upper_needs > 0) { | |
| 667 assert(middle_high_boundary() <= aligned_upper_new_high && | |
| 668 aligned_upper_new_high + upper_needs <= upper_high_boundary(), | |
| 669 "must not shrink beyond region"); | |
| 670 if (!os::uncommit_memory(aligned_upper_new_high, upper_needs)) { | |
| 671 debug_only(warning("os::uncommit_memory failed")); | |
| 672 return; | |
| 673 } else { | |
| 674 _upper_high -= upper_needs; | |
| 675 } | |
| 676 } | |
| 677 if (middle_needs > 0) { | |
| 678 assert(lower_high_boundary() <= aligned_middle_new_high && | |
| 679 aligned_middle_new_high + middle_needs <= middle_high_boundary(), | |
| 680 "must not shrink beyond region"); | |
| 681 if (!os::uncommit_memory(aligned_middle_new_high, middle_needs)) { | |
| 682 debug_only(warning("os::uncommit_memory failed")); | |
| 683 return; | |
| 684 } else { | |
| 685 _middle_high -= middle_needs; | |
| 686 } | |
| 687 } | |
| 688 if (lower_needs > 0) { | |
| 689 assert(low_boundary() <= aligned_lower_new_high && | |
| 690 aligned_lower_new_high + lower_needs <= lower_high_boundary(), | |
| 691 "must not shrink beyond region"); | |
| 692 if (!os::uncommit_memory(aligned_lower_new_high, lower_needs)) { | |
| 693 debug_only(warning("os::uncommit_memory failed")); | |
| 694 return; | |
| 695 } else { | |
| 696 _lower_high -= lower_needs; | |
| 697 } | |
| 698 } | |
| 699 | |
| 700 _high -= size; | |
| 701 } | |
| 702 | |
| 703 #ifndef PRODUCT | |
| 704 void VirtualSpace::check_for_contiguity() { | |
| 705 // Check contiguity. | |
| 706 assert(low_boundary() <= lower_high() && | |
| 707 lower_high() <= lower_high_boundary(), | |
| 708 "high address must be contained within the region"); | |
| 709 assert(lower_high_boundary() <= middle_high() && | |
| 710 middle_high() <= middle_high_boundary(), | |
| 711 "high address must be contained within the region"); | |
| 712 assert(middle_high_boundary() <= upper_high() && | |
| 713 upper_high() <= upper_high_boundary(), | |
| 714 "high address must be contained within the region"); | |
| 715 assert(low() >= low_boundary(), "low"); | |
| 716 assert(low_boundary() <= lower_high_boundary(), "lower high boundary"); | |
| 717 assert(upper_high_boundary() <= high_boundary(), "upper high boundary"); | |
| 718 assert(high() <= upper_high(), "upper high"); | |
| 719 } | |
| 720 | |
| 721 void VirtualSpace::print() { | |
| 722 tty->print ("Virtual space:"); | |
| 723 if (special()) tty->print(" (pinned in memory)"); | |
| 724 tty->cr(); | |
|
7623
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725 tty->print_cr(" - committed: " SIZE_FORMAT, committed_size()); |
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726 tty->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); |
| 0 | 727 tty->print_cr(" - [low, high]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low(), high()); |
| 728 tty->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low_boundary(), high_boundary()); | |
| 729 } | |
| 730 | |
|
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731 |
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732 /////////////// Unit tests /////////////// |
|
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733 |
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734 #ifndef PRODUCT |
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735 |
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736 #define test_log(...) \ |
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737 do {\ |
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738 if (VerboseInternalVMTests) { \ |
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739 tty->print_cr(__VA_ARGS__); \ |
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740 tty->flush(); \ |
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741 }\ |
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742 } while (false) |
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743 |
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744 class TestReservedSpace : AllStatic { |
|
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745 public: |
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746 static void small_page_write(void* addr, size_t size) { |
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747 size_t page_size = os::vm_page_size(); |
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748 |
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749 char* end = (char*)addr + size; |
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750 for (char* p = (char*)addr; p < end; p += page_size) { |
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751 *p = 1; |
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752 } |
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753 } |
|
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754 |
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755 static void release_memory_for_test(ReservedSpace rs) { |
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756 if (rs.special()) { |
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757 guarantee(os::release_memory_special(rs.base(), rs.size()), "Shouldn't fail"); |
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758 } else { |
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759 guarantee(os::release_memory(rs.base(), rs.size()), "Shouldn't fail"); |
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760 } |
|
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761 } |
|
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|
762 |
|
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|
763 static void test_reserved_space1(size_t size, size_t alignment) { |
|
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764 test_log("test_reserved_space1(%p)", (void*) (uintptr_t) size); |
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765 |
|
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766 assert(is_size_aligned(size, alignment), "Incorrect input parameters"); |
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767 |
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|
768 ReservedSpace rs(size, // size |
|
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|
769 alignment, // alignment |
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|
770 UseLargePages, // large |
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771 NULL, // requested_address |
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|
772 0); // noacces_prefix |
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773 |
|
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|
774 test_log(" rs.special() == %d", rs.special()); |
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775 |
|
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|
776 assert(rs.base() != NULL, "Must be"); |
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777 assert(rs.size() == size, "Must be"); |
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|
778 |
|
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|
779 assert(is_ptr_aligned(rs.base(), alignment), "aligned sizes should always give aligned addresses"); |
|
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780 assert(is_size_aligned(rs.size(), alignment), "aligned sizes should always give aligned addresses"); |
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781 |
|
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782 if (rs.special()) { |
|
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783 small_page_write(rs.base(), size); |
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|
784 } |
|
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|
785 |
|
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|
786 release_memory_for_test(rs); |
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|
787 } |
|
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|
788 |
|
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|
789 static void test_reserved_space2(size_t size) { |
|
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790 test_log("test_reserved_space2(%p)", (void*)(uintptr_t)size); |
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|
791 |
|
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792 assert(is_size_aligned(size, os::vm_allocation_granularity()), "Must be at least AG aligned"); |
|
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|
793 |
|
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|
794 ReservedSpace rs(size); |
|
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|
795 |
|
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|
796 test_log(" rs.special() == %d", rs.special()); |
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|
797 |
|
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|
798 assert(rs.base() != NULL, "Must be"); |
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|
799 assert(rs.size() == size, "Must be"); |
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|
800 |
|
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|
801 if (rs.special()) { |
|
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|
802 small_page_write(rs.base(), size); |
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|
803 } |
|
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|
804 |
|
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|
805 release_memory_for_test(rs); |
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806 } |
|
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|
807 |
|
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|
808 static void test_reserved_space3(size_t size, size_t alignment, bool maybe_large) { |
|
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809 test_log("test_reserved_space3(%p, %p, %d)", |
|
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810 (void*)(uintptr_t)size, (void*)(uintptr_t)alignment, maybe_large); |
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|
811 |
|
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812 assert(is_size_aligned(size, os::vm_allocation_granularity()), "Must be at least AG aligned"); |
|
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813 assert(is_size_aligned(size, alignment), "Must be at least aligned against alignment"); |
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|
814 |
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815 bool large = maybe_large && UseLargePages && size >= os::large_page_size(); |
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816 |
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817 ReservedSpace rs(size, alignment, large, false); |
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818 |
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819 test_log(" rs.special() == %d", rs.special()); |
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|
820 |
|
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821 assert(rs.base() != NULL, "Must be"); |
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|
822 assert(rs.size() == size, "Must be"); |
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823 |
|
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824 if (rs.special()) { |
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825 small_page_write(rs.base(), size); |
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|
826 } |
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|
827 |
|
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|
828 release_memory_for_test(rs); |
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|
829 } |
|
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|
830 |
|
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|
831 |
|
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|
832 static void test_reserved_space1() { |
|
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833 size_t size = 2 * 1024 * 1024; |
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834 size_t ag = os::vm_allocation_granularity(); |
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835 |
|
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|
836 test_reserved_space1(size, ag); |
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837 test_reserved_space1(size * 2, ag); |
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838 test_reserved_space1(size * 10, ag); |
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839 } |
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840 |
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841 static void test_reserved_space2() { |
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842 size_t size = 2 * 1024 * 1024; |
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843 size_t ag = os::vm_allocation_granularity(); |
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844 |
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845 test_reserved_space2(size * 1); |
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846 test_reserved_space2(size * 2); |
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847 test_reserved_space2(size * 10); |
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848 test_reserved_space2(ag); |
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849 test_reserved_space2(size - ag); |
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850 test_reserved_space2(size); |
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851 test_reserved_space2(size + ag); |
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852 test_reserved_space2(size * 2); |
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853 test_reserved_space2(size * 2 - ag); |
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854 test_reserved_space2(size * 2 + ag); |
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855 test_reserved_space2(size * 3); |
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856 test_reserved_space2(size * 3 - ag); |
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857 test_reserved_space2(size * 3 + ag); |
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858 test_reserved_space2(size * 10); |
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859 test_reserved_space2(size * 10 + size / 2); |
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860 } |
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861 |
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862 static void test_reserved_space3() { |
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863 size_t ag = os::vm_allocation_granularity(); |
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864 |
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865 test_reserved_space3(ag, ag , false); |
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866 test_reserved_space3(ag * 2, ag , false); |
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867 test_reserved_space3(ag * 3, ag , false); |
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868 test_reserved_space3(ag * 2, ag * 2, false); |
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869 test_reserved_space3(ag * 4, ag * 2, false); |
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870 test_reserved_space3(ag * 8, ag * 2, false); |
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871 test_reserved_space3(ag * 4, ag * 4, false); |
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872 test_reserved_space3(ag * 8, ag * 4, false); |
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873 test_reserved_space3(ag * 16, ag * 4, false); |
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874 |
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875 if (UseLargePages) { |
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876 size_t lp = os::large_page_size(); |
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877 |
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878 // Without large pages |
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879 test_reserved_space3(lp, ag * 4, false); |
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880 test_reserved_space3(lp * 2, ag * 4, false); |
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881 test_reserved_space3(lp * 4, ag * 4, false); |
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882 test_reserved_space3(lp, lp , false); |
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883 test_reserved_space3(lp * 2, lp , false); |
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884 test_reserved_space3(lp * 3, lp , false); |
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885 test_reserved_space3(lp * 2, lp * 2, false); |
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886 test_reserved_space3(lp * 4, lp * 2, false); |
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887 test_reserved_space3(lp * 8, lp * 2, false); |
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888 |
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889 // With large pages |
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890 test_reserved_space3(lp, ag * 4 , true); |
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891 test_reserved_space3(lp * 2, ag * 4, true); |
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892 test_reserved_space3(lp * 4, ag * 4, true); |
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893 test_reserved_space3(lp, lp , true); |
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894 test_reserved_space3(lp * 2, lp , true); |
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895 test_reserved_space3(lp * 3, lp , true); |
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896 test_reserved_space3(lp * 2, lp * 2, true); |
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897 test_reserved_space3(lp * 4, lp * 2, true); |
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898 test_reserved_space3(lp * 8, lp * 2, true); |
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899 } |
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900 } |
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901 |
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902 static void test_reserved_space() { |
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903 test_reserved_space1(); |
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904 test_reserved_space2(); |
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905 test_reserved_space3(); |
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906 } |
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907 }; |
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908 |
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909 void TestReservedSpace_test() { |
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910 TestReservedSpace::test_reserved_space(); |
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911 } |
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912 |
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913 #endif // PRODUCT |
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914 |
| 0 | 915 #endif |