Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp @ 337:9ee9cf798b59 jdk7-b37
6754988: Update copyright year
Summary: Update for files that have been modified starting July 2008
Reviewed-by: ohair, tbell
author | xdono |
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date | Thu, 02 Oct 2008 19:58:19 -0700 |
parents | 1fdb98a17101 |
children | 4e400c36026f |
rev | line source |
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0 | 1 /* |
337 | 2 * Copyright 2003-2008 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/_psVirtualspace.cpp.incl" | |
27 | |
28 // PSVirtualSpace | |
29 | |
30 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) : | |
31 _alignment(alignment) | |
32 { | |
33 set_reserved(rs); | |
34 set_committed(reserved_low_addr(), reserved_low_addr()); | |
35 DEBUG_ONLY(verify()); | |
36 } | |
37 | |
38 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) : | |
39 _alignment(os::vm_page_size()) | |
40 { | |
41 set_reserved(rs); | |
42 set_committed(reserved_low_addr(), reserved_low_addr()); | |
43 DEBUG_ONLY(verify()); | |
44 } | |
45 | |
46 // Deprecated. | |
47 PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) { | |
48 } | |
49 | |
50 // Deprecated. | |
51 bool PSVirtualSpace::initialize(ReservedSpace rs, | |
52 size_t commit_size) { | |
53 set_reserved(rs); | |
54 set_committed(reserved_low_addr(), reserved_low_addr()); | |
55 | |
56 // Commit to initial size. | |
57 assert(commit_size <= rs.size(), "commit_size too big"); | |
58 bool result = commit_size > 0 ? expand_by(commit_size) : true; | |
59 DEBUG_ONLY(verify()); | |
60 return result; | |
61 } | |
62 | |
63 PSVirtualSpace::~PSVirtualSpace() { | |
64 release(); | |
65 } | |
66 | |
67 bool PSVirtualSpace::contains(void* p) const { | |
68 char* const cp = (char*)p; | |
69 return cp >= committed_low_addr() && cp < committed_high_addr(); | |
70 } | |
71 | |
72 void PSVirtualSpace::release() { | |
73 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
237
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74 // This may not release memory it didn't reserve. |
1fdb98a17101
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75 // Use rs.release() to release the underlying memory instead. |
0 | 76 _reserved_low_addr = _reserved_high_addr = NULL; |
77 _committed_low_addr = _committed_high_addr = NULL; | |
78 _special = false; | |
79 } | |
80 | |
81 bool PSVirtualSpace::expand_by(size_t bytes, bool pre_touch) { | |
82 assert(is_aligned(bytes), "arg not aligned"); | |
83 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
84 | |
85 if (uncommitted_size() < bytes) { | |
86 return false; | |
87 } | |
88 | |
89 char* const base_addr = committed_high_addr(); | |
90 bool result = special() || os::commit_memory(base_addr, bytes, alignment()); | |
91 if (result) { | |
92 _committed_high_addr += bytes; | |
93 } | |
94 | |
95 if (pre_touch || AlwaysPreTouch) { | |
96 for (char* curr = base_addr; | |
97 curr < _committed_high_addr; | |
98 curr += os::vm_page_size()) { | |
99 char tmp = *curr; | |
100 *curr = 0; | |
101 } | |
102 } | |
103 | |
104 return result; | |
105 } | |
106 | |
107 bool PSVirtualSpace::shrink_by(size_t bytes) { | |
108 assert(is_aligned(bytes), "arg not aligned"); | |
109 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
110 | |
111 if (committed_size() < bytes) { | |
112 return false; | |
113 } | |
114 | |
115 char* const base_addr = committed_high_addr() - bytes; | |
116 bool result = special() || os::uncommit_memory(base_addr, bytes); | |
117 if (result) { | |
118 _committed_high_addr -= bytes; | |
119 } | |
120 | |
121 return result; | |
122 } | |
123 | |
124 size_t | |
125 PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) { | |
126 assert(is_aligned(bytes), "arg not aligned"); | |
127 assert(grows_up(), "this space must grow up"); | |
128 assert(other_space->grows_down(), "other space must grow down"); | |
129 assert(reserved_high_addr() == other_space->reserved_low_addr(), | |
130 "spaces not contiguous"); | |
131 assert(special() == other_space->special(), "one space is special, the other is not"); | |
132 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
133 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); | |
134 | |
135 size_t bytes_needed = bytes; | |
136 | |
137 // First use the uncommitted region in this space. | |
138 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); | |
139 if (tmp_bytes > 0) { | |
140 if (expand_by(tmp_bytes)) { | |
141 bytes_needed -= tmp_bytes; | |
142 } else { | |
143 return 0; | |
144 } | |
145 } | |
146 | |
147 // Next take from the uncommitted region in the other space, and commit it. | |
148 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); | |
149 if (tmp_bytes > 0) { | |
150 char* const commit_base = committed_high_addr(); | |
151 if (other_space->special() || | |
152 os::commit_memory(commit_base, tmp_bytes, alignment())) { | |
153 // Reduce the reserved region in the other space. | |
154 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, | |
155 other_space->reserved_high_addr(), | |
156 other_space->special()); | |
157 | |
158 // Grow both reserved and committed in this space. | |
159 _reserved_high_addr += tmp_bytes; | |
160 _committed_high_addr += tmp_bytes; | |
161 bytes_needed -= tmp_bytes; | |
162 } else { | |
163 return bytes - bytes_needed; | |
164 } | |
165 } | |
166 | |
167 // Finally take from the already committed region in the other space. | |
168 tmp_bytes = bytes_needed; | |
169 if (tmp_bytes > 0) { | |
170 // Reduce both committed and reserved in the other space. | |
171 other_space->set_committed(other_space->committed_low_addr() + tmp_bytes, | |
172 other_space->committed_high_addr()); | |
173 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, | |
174 other_space->reserved_high_addr(), | |
175 other_space->special()); | |
176 | |
177 // Grow both reserved and committed in this space. | |
178 _reserved_high_addr += tmp_bytes; | |
179 _committed_high_addr += tmp_bytes; | |
180 } | |
181 | |
182 return bytes; | |
183 } | |
184 | |
185 #ifndef PRODUCT | |
186 bool PSVirtualSpace::is_aligned(size_t value, size_t align) { | |
187 const size_t tmp_value = value + align - 1; | |
188 const size_t mask = ~(align - 1); | |
189 return (tmp_value & mask) == value; | |
190 } | |
191 | |
192 bool PSVirtualSpace::is_aligned(size_t value) const { | |
193 return is_aligned(value, alignment()); | |
194 } | |
195 | |
196 bool PSVirtualSpace::is_aligned(char* value) const { | |
197 return is_aligned((size_t)value); | |
198 } | |
199 | |
200 void PSVirtualSpace::verify() const { | |
201 assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment"); | |
202 assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr"); | |
203 assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr"); | |
204 assert(is_aligned(committed_low_addr()), "bad committed_low_addr"); | |
205 assert(is_aligned(committed_high_addr()), "bad committed_high_addr"); | |
206 | |
207 // Reserved region must be non-empty or both addrs must be 0. | |
208 assert(reserved_low_addr() < reserved_high_addr() || | |
209 reserved_low_addr() == NULL && reserved_high_addr() == NULL, | |
210 "bad reserved addrs"); | |
211 assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs"); | |
212 | |
213 if (grows_up()) { | |
214 assert(reserved_low_addr() == committed_low_addr(), "bad low addrs"); | |
215 assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs"); | |
216 } else { | |
217 assert(reserved_high_addr() == committed_high_addr(), "bad high addrs"); | |
218 assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs"); | |
219 } | |
220 } | |
221 | |
222 void PSVirtualSpace::print() const { | |
223 gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment=" | |
224 SIZE_FORMAT "K grows %s%s", | |
225 this, alignment() / K, grows_up() ? "up" : "down", | |
226 special() ? " (pinned in memory)" : ""); | |
227 gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K" | |
228 " [" PTR_FORMAT "," PTR_FORMAT "]" | |
229 " committed=" SIZE_FORMAT "K" | |
230 " [" PTR_FORMAT "," PTR_FORMAT "]", | |
231 reserved_size() / K, | |
232 reserved_low_addr(), reserved_high_addr(), | |
233 committed_size() / K, | |
234 committed_low_addr(), committed_high_addr()); | |
235 } | |
236 #endif // #ifndef PRODUCT | |
237 | |
238 void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const { | |
239 st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")", | |
240 low_boundary(), high(), high_boundary()); | |
241 } | |
242 | |
243 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs, | |
244 size_t alignment) : | |
245 PSVirtualSpace(alignment) | |
246 { | |
247 set_reserved(rs); | |
248 set_committed(reserved_high_addr(), reserved_high_addr()); | |
249 DEBUG_ONLY(verify()); | |
250 } | |
251 | |
252 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) { | |
253 set_reserved(rs); | |
254 set_committed(reserved_high_addr(), reserved_high_addr()); | |
255 DEBUG_ONLY(verify()); | |
256 } | |
257 | |
258 bool PSVirtualSpaceHighToLow::expand_by(size_t bytes, bool pre_touch) { | |
259 assert(is_aligned(bytes), "arg not aligned"); | |
260 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
261 | |
262 if (uncommitted_size() < bytes) { | |
263 return false; | |
264 } | |
265 | |
266 char* const base_addr = committed_low_addr() - bytes; | |
267 bool result = special() || os::commit_memory(base_addr, bytes, alignment()); | |
268 if (result) { | |
269 _committed_low_addr -= bytes; | |
270 } | |
271 | |
272 if (pre_touch || AlwaysPreTouch) { | |
273 for (char* curr = base_addr; | |
274 curr < _committed_high_addr; | |
275 curr += os::vm_page_size()) { | |
276 char tmp = *curr; | |
277 *curr = 0; | |
278 } | |
279 } | |
280 | |
281 return result; | |
282 } | |
283 | |
284 bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) { | |
285 assert(is_aligned(bytes), "arg not aligned"); | |
286 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
287 | |
288 if (committed_size() < bytes) { | |
289 return false; | |
290 } | |
291 | |
292 char* const base_addr = committed_low_addr(); | |
293 bool result = special() || os::uncommit_memory(base_addr, bytes); | |
294 if (result) { | |
295 _committed_low_addr += bytes; | |
296 } | |
297 | |
298 return result; | |
299 } | |
300 | |
301 size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space, | |
302 size_t bytes) { | |
303 assert(is_aligned(bytes), "arg not aligned"); | |
304 assert(grows_down(), "this space must grow down"); | |
305 assert(other_space->grows_up(), "other space must grow up"); | |
306 assert(reserved_low_addr() == other_space->reserved_high_addr(), | |
307 "spaces not contiguous"); | |
308 assert(special() == other_space->special(), "one space is special in memory, the other is not"); | |
309 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
310 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); | |
311 | |
312 size_t bytes_needed = bytes; | |
313 | |
314 // First use the uncommitted region in this space. | |
315 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); | |
316 if (tmp_bytes > 0) { | |
317 if (expand_by(tmp_bytes)) { | |
318 bytes_needed -= tmp_bytes; | |
319 } else { | |
320 return 0; | |
321 } | |
322 } | |
323 | |
324 // Next take from the uncommitted region in the other space, and commit it. | |
325 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); | |
326 if (tmp_bytes > 0) { | |
327 char* const commit_base = committed_low_addr() - tmp_bytes; | |
328 if (other_space->special() || | |
329 os::commit_memory(commit_base, tmp_bytes, alignment())) { | |
330 // Reduce the reserved region in the other space. | |
331 other_space->set_reserved(other_space->reserved_low_addr(), | |
332 other_space->reserved_high_addr() - tmp_bytes, | |
333 other_space->special()); | |
334 | |
335 // Grow both reserved and committed in this space. | |
336 _reserved_low_addr -= tmp_bytes; | |
337 _committed_low_addr -= tmp_bytes; | |
338 bytes_needed -= tmp_bytes; | |
339 } else { | |
340 return bytes - bytes_needed; | |
341 } | |
342 } | |
343 | |
344 // Finally take from the already committed region in the other space. | |
345 tmp_bytes = bytes_needed; | |
346 if (tmp_bytes > 0) { | |
347 // Reduce both committed and reserved in the other space. | |
348 other_space->set_committed(other_space->committed_low_addr(), | |
349 other_space->committed_high_addr() - tmp_bytes); | |
350 other_space->set_reserved(other_space->reserved_low_addr(), | |
351 other_space->reserved_high_addr() - tmp_bytes, | |
352 other_space->special()); | |
353 | |
354 // Grow both reserved and committed in this space. | |
355 _reserved_low_addr -= tmp_bytes; | |
356 _committed_low_addr -= tmp_bytes; | |
357 } | |
358 | |
359 return bytes; | |
360 } | |
361 | |
362 void | |
363 PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const { | |
364 st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]", | |
365 high_boundary(), low(), low_boundary()); | |
366 } |