Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/virtualspace.cpp @ 1468:e4cd5d2de7e1
Changes to sync with CRI changes.
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Fri, 19 Nov 2010 00:26:51 +0100 |
parents | bd02caa94611 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
844 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_virtualspace.cpp.incl" | |
27 | |
28 | |
29 // ReservedSpace | |
30 ReservedSpace::ReservedSpace(size_t size) { | |
656 | 31 initialize(size, 0, false, NULL, 0, false); |
0 | 32 } |
33 | |
34 ReservedSpace::ReservedSpace(size_t size, size_t alignment, | |
237
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35 bool large, |
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36 char* requested_address, |
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37 const size_t noaccess_prefix) { |
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38 initialize(size+noaccess_prefix, alignment, large, requested_address, |
656 | 39 noaccess_prefix, false); |
40 } | |
41 | |
42 ReservedSpace::ReservedSpace(size_t size, size_t alignment, | |
43 bool large, | |
44 bool executable) { | |
45 initialize(size, alignment, large, NULL, 0, executable); | |
0 | 46 } |
47 | |
48 char * | |
49 ReservedSpace::align_reserved_region(char* addr, const size_t len, | |
50 const size_t prefix_size, | |
51 const size_t prefix_align, | |
52 const size_t suffix_size, | |
53 const size_t suffix_align) | |
54 { | |
55 assert(addr != NULL, "sanity"); | |
56 const size_t required_size = prefix_size + suffix_size; | |
57 assert(len >= required_size, "len too small"); | |
58 | |
59 const size_t s = size_t(addr); | |
60 const size_t beg_ofs = s + prefix_size & suffix_align - 1; | |
61 const size_t beg_delta = beg_ofs == 0 ? 0 : suffix_align - beg_ofs; | |
62 | |
63 if (len < beg_delta + required_size) { | |
64 return NULL; // Cannot do proper alignment. | |
65 } | |
66 const size_t end_delta = len - (beg_delta + required_size); | |
67 | |
68 if (beg_delta != 0) { | |
69 os::release_memory(addr, beg_delta); | |
70 } | |
71 | |
72 if (end_delta != 0) { | |
73 char* release_addr = (char*) (s + beg_delta + required_size); | |
74 os::release_memory(release_addr, end_delta); | |
75 } | |
76 | |
77 return (char*) (s + beg_delta); | |
78 } | |
79 | |
80 char* ReservedSpace::reserve_and_align(const size_t reserve_size, | |
81 const size_t prefix_size, | |
82 const size_t prefix_align, | |
83 const size_t suffix_size, | |
84 const size_t suffix_align) | |
85 { | |
86 assert(reserve_size > prefix_size + suffix_size, "should not be here"); | |
87 | |
88 char* raw_addr = os::reserve_memory(reserve_size, NULL, prefix_align); | |
89 if (raw_addr == NULL) return NULL; | |
90 | |
91 char* result = align_reserved_region(raw_addr, reserve_size, prefix_size, | |
92 prefix_align, suffix_size, | |
93 suffix_align); | |
94 if (result == NULL && !os::release_memory(raw_addr, reserve_size)) { | |
95 fatal("os::release_memory failed"); | |
96 } | |
97 | |
98 #ifdef ASSERT | |
99 if (result != NULL) { | |
100 const size_t raw = size_t(raw_addr); | |
101 const size_t res = size_t(result); | |
102 assert(res >= raw, "alignment decreased start addr"); | |
103 assert(res + prefix_size + suffix_size <= raw + reserve_size, | |
104 "alignment increased end addr"); | |
105 assert((res & prefix_align - 1) == 0, "bad alignment of prefix"); | |
106 assert((res + prefix_size & suffix_align - 1) == 0, | |
107 "bad alignment of suffix"); | |
108 } | |
109 #endif | |
110 | |
111 return result; | |
112 } | |
113 | |
114 ReservedSpace::ReservedSpace(const size_t prefix_size, | |
115 const size_t prefix_align, | |
116 const size_t suffix_size, | |
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117 const size_t suffix_align, |
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118 char* requested_address, |
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119 const size_t noaccess_prefix) |
0 | 120 { |
121 assert(prefix_size != 0, "sanity"); | |
122 assert(prefix_align != 0, "sanity"); | |
123 assert(suffix_size != 0, "sanity"); | |
124 assert(suffix_align != 0, "sanity"); | |
125 assert((prefix_size & prefix_align - 1) == 0, | |
126 "prefix_size not divisible by prefix_align"); | |
127 assert((suffix_size & suffix_align - 1) == 0, | |
128 "suffix_size not divisible by suffix_align"); | |
129 assert((suffix_align & prefix_align - 1) == 0, | |
130 "suffix_align not divisible by prefix_align"); | |
131 | |
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132 // Add in noaccess_prefix to prefix_size; |
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133 const size_t adjusted_prefix_size = prefix_size + noaccess_prefix; |
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134 const size_t size = adjusted_prefix_size + suffix_size; |
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135 |
0 | 136 // On systems where the entire region has to be reserved and committed up |
137 // front, the compound alignment normally done by this method is unnecessary. | |
138 const bool try_reserve_special = UseLargePages && | |
139 prefix_align == os::large_page_size(); | |
140 if (!os::can_commit_large_page_memory() && try_reserve_special) { | |
656 | 141 initialize(size, prefix_align, true, requested_address, noaccess_prefix, |
142 false); | |
0 | 143 return; |
144 } | |
145 | |
146 _base = NULL; | |
147 _size = 0; | |
148 _alignment = 0; | |
149 _special = false; | |
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150 _noaccess_prefix = 0; |
656 | 151 _executable = false; |
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152 |
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153 // Assert that if noaccess_prefix is used, it is the same as prefix_align. |
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154 assert(noaccess_prefix == 0 || |
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155 noaccess_prefix == prefix_align, "noaccess prefix wrong"); |
0 | 156 |
157 // Optimistically try to reserve the exact size needed. | |
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158 char* addr; |
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159 if (requested_address != 0) { |
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160 addr = os::attempt_reserve_memory_at(size, |
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161 requested_address-noaccess_prefix); |
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162 } else { |
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163 addr = os::reserve_memory(size, NULL, prefix_align); |
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164 } |
0 | 165 if (addr == NULL) return; |
166 | |
167 // Check whether the result has the needed alignment (unlikely unless | |
168 // prefix_align == suffix_align). | |
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169 const size_t ofs = size_t(addr) + adjusted_prefix_size & suffix_align - 1; |
0 | 170 if (ofs != 0) { |
171 // Wrong alignment. Release, allocate more space and do manual alignment. | |
172 // | |
173 // On most operating systems, another allocation with a somewhat larger size | |
174 // will return an address "close to" that of the previous allocation. The | |
175 // result is often the same address (if the kernel hands out virtual | |
176 // addresses from low to high), or an address that is offset by the increase | |
177 // in size. Exploit that to minimize the amount of extra space requested. | |
178 if (!os::release_memory(addr, size)) { | |
179 fatal("os::release_memory failed"); | |
180 } | |
181 | |
182 const size_t extra = MAX2(ofs, suffix_align - ofs); | |
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183 addr = reserve_and_align(size + extra, adjusted_prefix_size, prefix_align, |
0 | 184 suffix_size, suffix_align); |
185 if (addr == NULL) { | |
186 // Try an even larger region. If this fails, address space is exhausted. | |
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187 addr = reserve_and_align(size + suffix_align, adjusted_prefix_size, |
0 | 188 prefix_align, suffix_size, suffix_align); |
189 } | |
190 } | |
191 | |
192 _base = addr; | |
193 _size = size; | |
194 _alignment = prefix_align; | |
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195 _noaccess_prefix = noaccess_prefix; |
0 | 196 } |
197 | |
198 void ReservedSpace::initialize(size_t size, size_t alignment, bool large, | |
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199 char* requested_address, |
656 | 200 const size_t noaccess_prefix, |
201 bool executable) { | |
0 | 202 const size_t granularity = os::vm_allocation_granularity(); |
203 assert((size & granularity - 1) == 0, | |
204 "size not aligned to os::vm_allocation_granularity()"); | |
205 assert((alignment & granularity - 1) == 0, | |
206 "alignment not aligned to os::vm_allocation_granularity()"); | |
207 assert(alignment == 0 || is_power_of_2((intptr_t)alignment), | |
208 "not a power of 2"); | |
209 | |
210 _base = NULL; | |
211 _size = 0; | |
212 _special = false; | |
656 | 213 _executable = executable; |
0 | 214 _alignment = 0; |
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215 _noaccess_prefix = 0; |
0 | 216 if (size == 0) { |
217 return; | |
218 } | |
219 | |
220 // If OS doesn't support demand paging for large page memory, we need | |
221 // to use reserve_memory_special() to reserve and pin the entire region. | |
222 bool special = large && !os::can_commit_large_page_memory(); | |
223 char* base = NULL; | |
224 | |
225 if (special) { | |
226 | |
656 | 227 base = os::reserve_memory_special(size, requested_address, executable); |
0 | 228 |
229 if (base != NULL) { | |
230 // Check alignment constraints | |
231 if (alignment > 0) { | |
232 assert((uintptr_t) base % alignment == 0, | |
233 "Large pages returned a non-aligned address"); | |
234 } | |
235 _special = true; | |
236 } else { | |
237 // failed; try to reserve regular memory below | |
238 } | |
239 } | |
240 | |
241 if (base == NULL) { | |
242 // Optimistically assume that the OSes returns an aligned base pointer. | |
243 // When reserving a large address range, most OSes seem to align to at | |
244 // least 64K. | |
245 | |
246 // If the memory was requested at a particular address, use | |
247 // os::attempt_reserve_memory_at() to avoid over mapping something | |
248 // important. If available space is not detected, return NULL. | |
249 | |
250 if (requested_address != 0) { | |
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251 base = os::attempt_reserve_memory_at(size, |
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252 requested_address-noaccess_prefix); |
0 | 253 } else { |
254 base = os::reserve_memory(size, NULL, alignment); | |
255 } | |
256 | |
257 if (base == NULL) return; | |
258 | |
259 // Check alignment constraints | |
260 if (alignment > 0 && ((size_t)base & alignment - 1) != 0) { | |
261 // Base not aligned, retry | |
262 if (!os::release_memory(base, size)) fatal("os::release_memory failed"); | |
263 // Reserve size large enough to do manual alignment and | |
264 // increase size to a multiple of the desired alignment | |
265 size = align_size_up(size, alignment); | |
266 size_t extra_size = size + alignment; | |
342 | 267 do { |
268 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); | |
269 if (extra_base == NULL) return; | |
270 // Do manual alignement | |
271 base = (char*) align_size_up((uintptr_t) extra_base, alignment); | |
272 assert(base >= extra_base, "just checking"); | |
273 // Re-reserve the region at the aligned base address. | |
274 os::release_memory(extra_base, extra_size); | |
275 base = os::reserve_memory(size, base); | |
276 } while (base == NULL); | |
0 | 277 } |
278 } | |
279 // Done | |
280 _base = base; | |
281 _size = size; | |
282 _alignment = MAX2(alignment, (size_t) os::vm_page_size()); | |
237
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283 _noaccess_prefix = noaccess_prefix; |
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284 |
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285 // Assert that if noaccess_prefix is used, it is the same as alignment. |
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286 assert(noaccess_prefix == 0 || |
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287 noaccess_prefix == _alignment, "noaccess prefix wrong"); |
0 | 288 |
289 assert(markOopDesc::encode_pointer_as_mark(_base)->decode_pointer() == _base, | |
290 "area must be distinguisable from marks for mark-sweep"); | |
291 assert(markOopDesc::encode_pointer_as_mark(&_base[size])->decode_pointer() == &_base[size], | |
292 "area must be distinguisable from marks for mark-sweep"); | |
293 } | |
294 | |
295 | |
296 ReservedSpace::ReservedSpace(char* base, size_t size, size_t alignment, | |
656 | 297 bool special, bool executable) { |
0 | 298 assert((size % os::vm_allocation_granularity()) == 0, |
299 "size not allocation aligned"); | |
300 _base = base; | |
301 _size = size; | |
302 _alignment = alignment; | |
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303 _noaccess_prefix = 0; |
0 | 304 _special = special; |
656 | 305 _executable = executable; |
0 | 306 } |
307 | |
308 | |
309 ReservedSpace ReservedSpace::first_part(size_t partition_size, size_t alignment, | |
310 bool split, bool realloc) { | |
311 assert(partition_size <= size(), "partition failed"); | |
312 if (split) { | |
656 | 313 os::split_reserved_memory(base(), size(), partition_size, realloc); |
0 | 314 } |
656 | 315 ReservedSpace result(base(), partition_size, alignment, special(), |
316 executable()); | |
0 | 317 return result; |
318 } | |
319 | |
320 | |
321 ReservedSpace | |
322 ReservedSpace::last_part(size_t partition_size, size_t alignment) { | |
323 assert(partition_size <= size(), "partition failed"); | |
324 ReservedSpace result(base() + partition_size, size() - partition_size, | |
656 | 325 alignment, special(), executable()); |
0 | 326 return result; |
327 } | |
328 | |
329 | |
330 size_t ReservedSpace::page_align_size_up(size_t size) { | |
331 return align_size_up(size, os::vm_page_size()); | |
332 } | |
333 | |
334 | |
335 size_t ReservedSpace::page_align_size_down(size_t size) { | |
336 return align_size_down(size, os::vm_page_size()); | |
337 } | |
338 | |
339 | |
340 size_t ReservedSpace::allocation_align_size_up(size_t size) { | |
341 return align_size_up(size, os::vm_allocation_granularity()); | |
342 } | |
343 | |
344 | |
345 size_t ReservedSpace::allocation_align_size_down(size_t size) { | |
346 return align_size_down(size, os::vm_allocation_granularity()); | |
347 } | |
348 | |
349 | |
350 void ReservedSpace::release() { | |
351 if (is_reserved()) { | |
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352 char *real_base = _base - _noaccess_prefix; |
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353 const size_t real_size = _size + _noaccess_prefix; |
0 | 354 if (special()) { |
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355 os::release_memory_special(real_base, real_size); |
0 | 356 } else{ |
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357 os::release_memory(real_base, real_size); |
0 | 358 } |
359 _base = NULL; | |
360 _size = 0; | |
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361 _noaccess_prefix = 0; |
0 | 362 _special = false; |
656 | 363 _executable = false; |
0 | 364 } |
365 } | |
366 | |
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367 void ReservedSpace::protect_noaccess_prefix(const size_t size) { |
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368 // If there is noaccess prefix, return. |
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369 if (_noaccess_prefix == 0) return; |
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370 |
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371 assert(_noaccess_prefix >= (size_t)os::vm_page_size(), |
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372 "must be at least page size big"); |
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373 |
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374 // Protect memory at the base of the allocated region. |
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375 // If special, the page was committed (only matters on windows) |
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376 if (!os::protect_memory(_base, _noaccess_prefix, os::MEM_PROT_NONE, |
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377 _special)) { |
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378 fatal("cannot protect protection page"); |
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379 } |
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380 |
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381 _base += _noaccess_prefix; |
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382 _size -= _noaccess_prefix; |
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383 assert((size == _size) && ((uintptr_t)_base % _alignment == 0), |
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384 "must be exactly of required size and alignment"); |
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385 } |
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386 |
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387 ReservedHeapSpace::ReservedHeapSpace(size_t size, size_t alignment, |
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388 bool large, char* requested_address) : |
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389 ReservedSpace(size, alignment, large, |
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390 requested_address, |
642
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391 (UseCompressedOops && (Universe::narrow_oop_base() != NULL) && |
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392 Universe::narrow_oop_use_implicit_null_checks()) ? |
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393 lcm(os::vm_page_size(), alignment) : 0) { |
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394 // Only reserved space for the java heap should have a noaccess_prefix |
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395 // if using compressed oops. |
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396 protect_noaccess_prefix(size); |
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397 } |
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398 |
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399 ReservedHeapSpace::ReservedHeapSpace(const size_t prefix_size, |
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400 const size_t prefix_align, |
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401 const size_t suffix_size, |
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402 const size_t suffix_align, |
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403 char* requested_address) : |
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404 ReservedSpace(prefix_size, prefix_align, suffix_size, suffix_align, |
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405 requested_address, |
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406 (UseCompressedOops && (Universe::narrow_oop_base() != NULL) && |
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407 Universe::narrow_oop_use_implicit_null_checks()) ? |
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408 lcm(os::vm_page_size(), prefix_align) : 0) { |
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409 protect_noaccess_prefix(prefix_size+suffix_size); |
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410 } |
0 | 411 |
656 | 412 // Reserve space for code segment. Same as Java heap only we mark this as |
413 // executable. | |
414 ReservedCodeSpace::ReservedCodeSpace(size_t r_size, | |
415 size_t rs_align, | |
416 bool large) : | |
417 ReservedSpace(r_size, rs_align, large, /*executable*/ true) { | |
418 } | |
419 | |
0 | 420 // VirtualSpace |
421 | |
422 VirtualSpace::VirtualSpace() { | |
423 _low_boundary = NULL; | |
424 _high_boundary = NULL; | |
425 _low = NULL; | |
426 _high = NULL; | |
427 _lower_high = NULL; | |
428 _middle_high = NULL; | |
429 _upper_high = NULL; | |
430 _lower_high_boundary = NULL; | |
431 _middle_high_boundary = NULL; | |
432 _upper_high_boundary = NULL; | |
433 _lower_alignment = 0; | |
434 _middle_alignment = 0; | |
435 _upper_alignment = 0; | |
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436 _special = false; |
656 | 437 _executable = false; |
0 | 438 } |
439 | |
440 | |
441 bool VirtualSpace::initialize(ReservedSpace rs, size_t committed_size) { | |
442 if(!rs.is_reserved()) return false; // allocation failed. | |
443 assert(_low_boundary == NULL, "VirtualSpace already initialized"); | |
444 _low_boundary = rs.base(); | |
445 _high_boundary = low_boundary() + rs.size(); | |
446 | |
447 _low = low_boundary(); | |
448 _high = low(); | |
449 | |
450 _special = rs.special(); | |
656 | 451 _executable = rs.executable(); |
0 | 452 |
453 // When a VirtualSpace begins life at a large size, make all future expansion | |
454 // and shrinking occur aligned to a granularity of large pages. This avoids | |
455 // fragmentation of physical addresses that inhibits the use of large pages | |
456 // by the OS virtual memory system. Empirically, we see that with a 4MB | |
457 // page size, the only spaces that get handled this way are codecache and | |
458 // the heap itself, both of which provide a substantial performance | |
459 // boost in many benchmarks when covered by large pages. | |
460 // | |
461 // No attempt is made to force large page alignment at the very top and | |
462 // bottom of the space if they are not aligned so already. | |
463 _lower_alignment = os::vm_page_size(); | |
464 _middle_alignment = os::page_size_for_region(rs.size(), rs.size(), 1); | |
465 _upper_alignment = os::vm_page_size(); | |
466 | |
467 // End of each region | |
468 _lower_high_boundary = (char*) round_to((intptr_t) low_boundary(), middle_alignment()); | |
469 _middle_high_boundary = (char*) round_down((intptr_t) high_boundary(), middle_alignment()); | |
470 _upper_high_boundary = high_boundary(); | |
471 | |
472 // High address of each region | |
473 _lower_high = low_boundary(); | |
474 _middle_high = lower_high_boundary(); | |
475 _upper_high = middle_high_boundary(); | |
476 | |
477 // commit to initial size | |
478 if (committed_size > 0) { | |
479 if (!expand_by(committed_size)) { | |
480 return false; | |
481 } | |
482 } | |
483 return true; | |
484 } | |
485 | |
486 | |
487 VirtualSpace::~VirtualSpace() { | |
488 release(); | |
489 } | |
490 | |
491 | |
492 void VirtualSpace::release() { | |
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493 // This does not release memory it never reserved. |
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494 // Caller must release via rs.release(); |
0 | 495 _low_boundary = NULL; |
496 _high_boundary = NULL; | |
497 _low = NULL; | |
498 _high = NULL; | |
499 _lower_high = NULL; | |
500 _middle_high = NULL; | |
501 _upper_high = NULL; | |
502 _lower_high_boundary = NULL; | |
503 _middle_high_boundary = NULL; | |
504 _upper_high_boundary = NULL; | |
505 _lower_alignment = 0; | |
506 _middle_alignment = 0; | |
507 _upper_alignment = 0; | |
508 _special = false; | |
656 | 509 _executable = false; |
0 | 510 } |
511 | |
512 | |
513 size_t VirtualSpace::committed_size() const { | |
514 return pointer_delta(high(), low(), sizeof(char)); | |
515 } | |
516 | |
517 | |
518 size_t VirtualSpace::reserved_size() const { | |
519 return pointer_delta(high_boundary(), low_boundary(), sizeof(char)); | |
520 } | |
521 | |
522 | |
523 size_t VirtualSpace::uncommitted_size() const { | |
524 return reserved_size() - committed_size(); | |
525 } | |
526 | |
527 | |
528 bool VirtualSpace::contains(const void* p) const { | |
529 return low() <= (const char*) p && (const char*) p < high(); | |
530 } | |
531 | |
532 /* | |
533 First we need to determine if a particular virtual space is using large | |
534 pages. This is done at the initialize function and only virtual spaces | |
535 that are larger than LargePageSizeInBytes use large pages. Once we | |
536 have determined this, all expand_by and shrink_by calls must grow and | |
537 shrink by large page size chunks. If a particular request | |
538 is within the current large page, the call to commit and uncommit memory | |
539 can be ignored. In the case that the low and high boundaries of this | |
540 space is not large page aligned, the pages leading to the first large | |
541 page address and the pages after the last large page address must be | |
542 allocated with default pages. | |
543 */ | |
544 bool VirtualSpace::expand_by(size_t bytes, bool pre_touch) { | |
545 if (uncommitted_size() < bytes) return false; | |
546 | |
547 if (special()) { | |
548 // don't commit memory if the entire space is pinned in memory | |
549 _high += bytes; | |
550 return true; | |
551 } | |
552 | |
553 char* previous_high = high(); | |
554 char* unaligned_new_high = high() + bytes; | |
555 assert(unaligned_new_high <= high_boundary(), | |
556 "cannot expand by more than upper boundary"); | |
557 | |
558 // Calculate where the new high for each of the regions should be. If | |
559 // the low_boundary() and high_boundary() are LargePageSizeInBytes aligned | |
560 // then the unaligned lower and upper new highs would be the | |
561 // lower_high() and upper_high() respectively. | |
562 char* unaligned_lower_new_high = | |
563 MIN2(unaligned_new_high, lower_high_boundary()); | |
564 char* unaligned_middle_new_high = | |
565 MIN2(unaligned_new_high, middle_high_boundary()); | |
566 char* unaligned_upper_new_high = | |
567 MIN2(unaligned_new_high, upper_high_boundary()); | |
568 | |
569 // Align the new highs based on the regions alignment. lower and upper | |
570 // alignment will always be default page size. middle alignment will be | |
571 // LargePageSizeInBytes if the actual size of the virtual space is in | |
572 // fact larger than LargePageSizeInBytes. | |
573 char* aligned_lower_new_high = | |
574 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
575 char* aligned_middle_new_high = | |
576 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
577 char* aligned_upper_new_high = | |
578 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
579 | |
580 // Determine which regions need to grow in this expand_by call. | |
581 // If you are growing in the lower region, high() must be in that | |
582 // region so calcuate the size based on high(). For the middle and | |
583 // upper regions, determine the starting point of growth based on the | |
584 // location of high(). By getting the MAX of the region's low address | |
585 // (or the prevoius region's high address) and high(), we can tell if it | |
586 // is an intra or inter region growth. | |
587 size_t lower_needs = 0; | |
588 if (aligned_lower_new_high > lower_high()) { | |
589 lower_needs = | |
590 pointer_delta(aligned_lower_new_high, lower_high(), sizeof(char)); | |
591 } | |
592 size_t middle_needs = 0; | |
593 if (aligned_middle_new_high > middle_high()) { | |
594 middle_needs = | |
595 pointer_delta(aligned_middle_new_high, middle_high(), sizeof(char)); | |
596 } | |
597 size_t upper_needs = 0; | |
598 if (aligned_upper_new_high > upper_high()) { | |
599 upper_needs = | |
600 pointer_delta(aligned_upper_new_high, upper_high(), sizeof(char)); | |
601 } | |
602 | |
603 // Check contiguity. | |
604 assert(low_boundary() <= lower_high() && | |
605 lower_high() <= lower_high_boundary(), | |
606 "high address must be contained within the region"); | |
607 assert(lower_high_boundary() <= middle_high() && | |
608 middle_high() <= middle_high_boundary(), | |
609 "high address must be contained within the region"); | |
610 assert(middle_high_boundary() <= upper_high() && | |
611 upper_high() <= upper_high_boundary(), | |
612 "high address must be contained within the region"); | |
613 | |
614 // Commit regions | |
615 if (lower_needs > 0) { | |
616 assert(low_boundary() <= lower_high() && | |
617 lower_high() + lower_needs <= lower_high_boundary(), | |
618 "must not expand beyond region"); | |
656 | 619 if (!os::commit_memory(lower_high(), lower_needs, _executable)) { |
0 | 620 debug_only(warning("os::commit_memory failed")); |
621 return false; | |
622 } else { | |
623 _lower_high += lower_needs; | |
624 } | |
625 } | |
626 if (middle_needs > 0) { | |
627 assert(lower_high_boundary() <= middle_high() && | |
628 middle_high() + middle_needs <= middle_high_boundary(), | |
629 "must not expand beyond region"); | |
656 | 630 if (!os::commit_memory(middle_high(), middle_needs, middle_alignment(), |
631 _executable)) { | |
0 | 632 debug_only(warning("os::commit_memory failed")); |
633 return false; | |
634 } | |
635 _middle_high += middle_needs; | |
636 } | |
637 if (upper_needs > 0) { | |
638 assert(middle_high_boundary() <= upper_high() && | |
639 upper_high() + upper_needs <= upper_high_boundary(), | |
640 "must not expand beyond region"); | |
656 | 641 if (!os::commit_memory(upper_high(), upper_needs, _executable)) { |
0 | 642 debug_only(warning("os::commit_memory failed")); |
643 return false; | |
644 } else { | |
645 _upper_high += upper_needs; | |
646 } | |
647 } | |
648 | |
649 if (pre_touch || AlwaysPreTouch) { | |
650 int vm_ps = os::vm_page_size(); | |
651 for (char* curr = previous_high; | |
652 curr < unaligned_new_high; | |
653 curr += vm_ps) { | |
654 // Note the use of a write here; originally we tried just a read, but | |
655 // since the value read was unused, the optimizer removed the read. | |
656 // If we ever have a concurrent touchahead thread, we'll want to use | |
657 // a read, to avoid the potential of overwriting data (if a mutator | |
658 // thread beats the touchahead thread to a page). There are various | |
659 // ways of making sure this read is not optimized away: for example, | |
660 // generating the code for a read procedure at runtime. | |
661 *curr = 0; | |
662 } | |
663 } | |
664 | |
665 _high += bytes; | |
666 return true; | |
667 } | |
668 | |
669 // A page is uncommitted if the contents of the entire page is deemed unusable. | |
670 // Continue to decrement the high() pointer until it reaches a page boundary | |
671 // in which case that particular page can now be uncommitted. | |
672 void VirtualSpace::shrink_by(size_t size) { | |
673 if (committed_size() < size) | |
674 fatal("Cannot shrink virtual space to negative size"); | |
675 | |
676 if (special()) { | |
677 // don't uncommit if the entire space is pinned in memory | |
678 _high -= size; | |
679 return; | |
680 } | |
681 | |
682 char* unaligned_new_high = high() - size; | |
683 assert(unaligned_new_high >= low_boundary(), "cannot shrink past lower boundary"); | |
684 | |
685 // Calculate new unaligned address | |
686 char* unaligned_upper_new_high = | |
687 MAX2(unaligned_new_high, middle_high_boundary()); | |
688 char* unaligned_middle_new_high = | |
689 MAX2(unaligned_new_high, lower_high_boundary()); | |
690 char* unaligned_lower_new_high = | |
691 MAX2(unaligned_new_high, low_boundary()); | |
692 | |
693 // Align address to region's alignment | |
694 char* aligned_upper_new_high = | |
695 (char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment()); | |
696 char* aligned_middle_new_high = | |
697 (char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment()); | |
698 char* aligned_lower_new_high = | |
699 (char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment()); | |
700 | |
701 // Determine which regions need to shrink | |
702 size_t upper_needs = 0; | |
703 if (aligned_upper_new_high < upper_high()) { | |
704 upper_needs = | |
705 pointer_delta(upper_high(), aligned_upper_new_high, sizeof(char)); | |
706 } | |
707 size_t middle_needs = 0; | |
708 if (aligned_middle_new_high < middle_high()) { | |
709 middle_needs = | |
710 pointer_delta(middle_high(), aligned_middle_new_high, sizeof(char)); | |
711 } | |
712 size_t lower_needs = 0; | |
713 if (aligned_lower_new_high < lower_high()) { | |
714 lower_needs = | |
715 pointer_delta(lower_high(), aligned_lower_new_high, sizeof(char)); | |
716 } | |
717 | |
718 // Check contiguity. | |
719 assert(middle_high_boundary() <= upper_high() && | |
720 upper_high() <= upper_high_boundary(), | |
721 "high address must be contained within the region"); | |
722 assert(lower_high_boundary() <= middle_high() && | |
723 middle_high() <= middle_high_boundary(), | |
724 "high address must be contained within the region"); | |
725 assert(low_boundary() <= lower_high() && | |
726 lower_high() <= lower_high_boundary(), | |
727 "high address must be contained within the region"); | |
728 | |
729 // Uncommit | |
730 if (upper_needs > 0) { | |
731 assert(middle_high_boundary() <= aligned_upper_new_high && | |
732 aligned_upper_new_high + upper_needs <= upper_high_boundary(), | |
733 "must not shrink beyond region"); | |
734 if (!os::uncommit_memory(aligned_upper_new_high, upper_needs)) { | |
735 debug_only(warning("os::uncommit_memory failed")); | |
736 return; | |
737 } else { | |
738 _upper_high -= upper_needs; | |
739 } | |
740 } | |
741 if (middle_needs > 0) { | |
742 assert(lower_high_boundary() <= aligned_middle_new_high && | |
743 aligned_middle_new_high + middle_needs <= middle_high_boundary(), | |
744 "must not shrink beyond region"); | |
745 if (!os::uncommit_memory(aligned_middle_new_high, middle_needs)) { | |
746 debug_only(warning("os::uncommit_memory failed")); | |
747 return; | |
748 } else { | |
749 _middle_high -= middle_needs; | |
750 } | |
751 } | |
752 if (lower_needs > 0) { | |
753 assert(low_boundary() <= aligned_lower_new_high && | |
754 aligned_lower_new_high + lower_needs <= lower_high_boundary(), | |
755 "must not shrink beyond region"); | |
756 if (!os::uncommit_memory(aligned_lower_new_high, lower_needs)) { | |
757 debug_only(warning("os::uncommit_memory failed")); | |
758 return; | |
759 } else { | |
760 _lower_high -= lower_needs; | |
761 } | |
762 } | |
763 | |
764 _high -= size; | |
765 } | |
766 | |
767 #ifndef PRODUCT | |
768 void VirtualSpace::check_for_contiguity() { | |
769 // Check contiguity. | |
770 assert(low_boundary() <= lower_high() && | |
771 lower_high() <= lower_high_boundary(), | |
772 "high address must be contained within the region"); | |
773 assert(lower_high_boundary() <= middle_high() && | |
774 middle_high() <= middle_high_boundary(), | |
775 "high address must be contained within the region"); | |
776 assert(middle_high_boundary() <= upper_high() && | |
777 upper_high() <= upper_high_boundary(), | |
778 "high address must be contained within the region"); | |
779 assert(low() >= low_boundary(), "low"); | |
780 assert(low_boundary() <= lower_high_boundary(), "lower high boundary"); | |
781 assert(upper_high_boundary() <= high_boundary(), "upper high boundary"); | |
782 assert(high() <= upper_high(), "upper high"); | |
783 } | |
784 | |
785 void VirtualSpace::print() { | |
786 tty->print ("Virtual space:"); | |
787 if (special()) tty->print(" (pinned in memory)"); | |
788 tty->cr(); | |
789 tty->print_cr(" - committed: %ld", committed_size()); | |
790 tty->print_cr(" - reserved: %ld", reserved_size()); | |
791 tty->print_cr(" - [low, high]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low(), high()); | |
792 tty->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low_boundary(), high_boundary()); | |
793 } | |
794 | |
795 #endif |