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annotate src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp @ 2674:6ab73784566a
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 13 May 2011 15:18:41 +0200 |
parents | f95d63e2154a |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, 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 * | |
1552
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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 "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
27 #include "runtime/os.hpp" | |
28 #include "runtime/virtualspace.hpp" | |
29 #ifdef TARGET_OS_FAMILY_linux | |
30 # include "os_linux.inline.hpp" | |
31 #endif | |
32 #ifdef TARGET_OS_FAMILY_solaris | |
33 # include "os_solaris.inline.hpp" | |
34 #endif | |
35 #ifdef TARGET_OS_FAMILY_windows | |
36 # include "os_windows.inline.hpp" | |
37 #endif | |
0 | 38 |
39 // PSVirtualSpace | |
40 | |
41 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) : | |
42 _alignment(alignment) | |
43 { | |
44 set_reserved(rs); | |
45 set_committed(reserved_low_addr(), reserved_low_addr()); | |
46 DEBUG_ONLY(verify()); | |
47 } | |
48 | |
49 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) : | |
50 _alignment(os::vm_page_size()) | |
51 { | |
52 set_reserved(rs); | |
53 set_committed(reserved_low_addr(), reserved_low_addr()); | |
54 DEBUG_ONLY(verify()); | |
55 } | |
56 | |
57 // Deprecated. | |
58 PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) { | |
59 } | |
60 | |
61 // Deprecated. | |
62 bool PSVirtualSpace::initialize(ReservedSpace rs, | |
63 size_t commit_size) { | |
64 set_reserved(rs); | |
65 set_committed(reserved_low_addr(), reserved_low_addr()); | |
66 | |
67 // Commit to initial size. | |
68 assert(commit_size <= rs.size(), "commit_size too big"); | |
69 bool result = commit_size > 0 ? expand_by(commit_size) : true; | |
70 DEBUG_ONLY(verify()); | |
71 return result; | |
72 } | |
73 | |
74 PSVirtualSpace::~PSVirtualSpace() { | |
75 release(); | |
76 } | |
77 | |
78 bool PSVirtualSpace::contains(void* p) const { | |
79 char* const cp = (char*)p; | |
80 return cp >= committed_low_addr() && cp < committed_high_addr(); | |
81 } | |
82 | |
83 void PSVirtualSpace::release() { | |
84 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
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85 // This may not release memory it didn't reserve. |
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86 // Use rs.release() to release the underlying memory instead. |
0 | 87 _reserved_low_addr = _reserved_high_addr = NULL; |
88 _committed_low_addr = _committed_high_addr = NULL; | |
89 _special = false; | |
90 } | |
91 | |
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92 bool PSVirtualSpace::expand_by(size_t bytes) { |
0 | 93 assert(is_aligned(bytes), "arg not aligned"); |
94 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
95 | |
96 if (uncommitted_size() < bytes) { | |
97 return false; | |
98 } | |
99 | |
100 char* const base_addr = committed_high_addr(); | |
101 bool result = special() || os::commit_memory(base_addr, bytes, alignment()); | |
102 if (result) { | |
103 _committed_high_addr += bytes; | |
104 } | |
105 | |
106 return result; | |
107 } | |
108 | |
109 bool PSVirtualSpace::shrink_by(size_t bytes) { | |
110 assert(is_aligned(bytes), "arg not aligned"); | |
111 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
112 | |
113 if (committed_size() < bytes) { | |
114 return false; | |
115 } | |
116 | |
117 char* const base_addr = committed_high_addr() - bytes; | |
118 bool result = special() || os::uncommit_memory(base_addr, bytes); | |
119 if (result) { | |
120 _committed_high_addr -= bytes; | |
121 } | |
122 | |
123 return result; | |
124 } | |
125 | |
126 size_t | |
127 PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) { | |
128 assert(is_aligned(bytes), "arg not aligned"); | |
129 assert(grows_up(), "this space must grow up"); | |
130 assert(other_space->grows_down(), "other space must grow down"); | |
131 assert(reserved_high_addr() == other_space->reserved_low_addr(), | |
132 "spaces not contiguous"); | |
133 assert(special() == other_space->special(), "one space is special, the other is not"); | |
134 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
135 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); | |
136 | |
137 size_t bytes_needed = bytes; | |
138 | |
139 // First use the uncommitted region in this space. | |
140 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); | |
141 if (tmp_bytes > 0) { | |
142 if (expand_by(tmp_bytes)) { | |
143 bytes_needed -= tmp_bytes; | |
144 } else { | |
145 return 0; | |
146 } | |
147 } | |
148 | |
149 // Next take from the uncommitted region in the other space, and commit it. | |
150 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); | |
151 if (tmp_bytes > 0) { | |
152 char* const commit_base = committed_high_addr(); | |
153 if (other_space->special() || | |
154 os::commit_memory(commit_base, tmp_bytes, alignment())) { | |
155 // Reduce the reserved region in the other space. | |
156 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, | |
157 other_space->reserved_high_addr(), | |
158 other_space->special()); | |
159 | |
160 // Grow both reserved and committed in this space. | |
161 _reserved_high_addr += tmp_bytes; | |
162 _committed_high_addr += tmp_bytes; | |
163 bytes_needed -= tmp_bytes; | |
164 } else { | |
165 return bytes - bytes_needed; | |
166 } | |
167 } | |
168 | |
169 // Finally take from the already committed region in the other space. | |
170 tmp_bytes = bytes_needed; | |
171 if (tmp_bytes > 0) { | |
172 // Reduce both committed and reserved in the other space. | |
173 other_space->set_committed(other_space->committed_low_addr() + tmp_bytes, | |
174 other_space->committed_high_addr()); | |
175 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes, | |
176 other_space->reserved_high_addr(), | |
177 other_space->special()); | |
178 | |
179 // Grow both reserved and committed in this space. | |
180 _reserved_high_addr += tmp_bytes; | |
181 _committed_high_addr += tmp_bytes; | |
182 } | |
183 | |
184 return bytes; | |
185 } | |
186 | |
187 #ifndef PRODUCT | |
188 bool PSVirtualSpace::is_aligned(size_t value, size_t align) { | |
189 const size_t tmp_value = value + align - 1; | |
190 const size_t mask = ~(align - 1); | |
191 return (tmp_value & mask) == value; | |
192 } | |
193 | |
194 bool PSVirtualSpace::is_aligned(size_t value) const { | |
195 return is_aligned(value, alignment()); | |
196 } | |
197 | |
198 bool PSVirtualSpace::is_aligned(char* value) const { | |
199 return is_aligned((size_t)value); | |
200 } | |
201 | |
202 void PSVirtualSpace::verify() const { | |
203 assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment"); | |
204 assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr"); | |
205 assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr"); | |
206 assert(is_aligned(committed_low_addr()), "bad committed_low_addr"); | |
207 assert(is_aligned(committed_high_addr()), "bad committed_high_addr"); | |
208 | |
209 // Reserved region must be non-empty or both addrs must be 0. | |
210 assert(reserved_low_addr() < reserved_high_addr() || | |
211 reserved_low_addr() == NULL && reserved_high_addr() == NULL, | |
212 "bad reserved addrs"); | |
213 assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs"); | |
214 | |
215 if (grows_up()) { | |
216 assert(reserved_low_addr() == committed_low_addr(), "bad low addrs"); | |
217 assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs"); | |
218 } else { | |
219 assert(reserved_high_addr() == committed_high_addr(), "bad high addrs"); | |
220 assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs"); | |
221 } | |
222 } | |
223 | |
224 void PSVirtualSpace::print() const { | |
225 gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment=" | |
226 SIZE_FORMAT "K grows %s%s", | |
227 this, alignment() / K, grows_up() ? "up" : "down", | |
228 special() ? " (pinned in memory)" : ""); | |
229 gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K" | |
230 " [" PTR_FORMAT "," PTR_FORMAT "]" | |
231 " committed=" SIZE_FORMAT "K" | |
232 " [" PTR_FORMAT "," PTR_FORMAT "]", | |
233 reserved_size() / K, | |
234 reserved_low_addr(), reserved_high_addr(), | |
235 committed_size() / K, | |
236 committed_low_addr(), committed_high_addr()); | |
237 } | |
238 #endif // #ifndef PRODUCT | |
239 | |
240 void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const { | |
241 st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")", | |
242 low_boundary(), high(), high_boundary()); | |
243 } | |
244 | |
245 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs, | |
246 size_t alignment) : | |
247 PSVirtualSpace(alignment) | |
248 { | |
249 set_reserved(rs); | |
250 set_committed(reserved_high_addr(), reserved_high_addr()); | |
251 DEBUG_ONLY(verify()); | |
252 } | |
253 | |
254 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) { | |
255 set_reserved(rs); | |
256 set_committed(reserved_high_addr(), reserved_high_addr()); | |
257 DEBUG_ONLY(verify()); | |
258 } | |
259 | |
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260 bool PSVirtualSpaceHighToLow::expand_by(size_t bytes) { |
0 | 261 assert(is_aligned(bytes), "arg not aligned"); |
262 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
263 | |
264 if (uncommitted_size() < bytes) { | |
265 return false; | |
266 } | |
267 | |
268 char* const base_addr = committed_low_addr() - bytes; | |
269 bool result = special() || os::commit_memory(base_addr, bytes, alignment()); | |
270 if (result) { | |
271 _committed_low_addr -= bytes; | |
272 } | |
273 | |
274 return result; | |
275 } | |
276 | |
277 bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) { | |
278 assert(is_aligned(bytes), "arg not aligned"); | |
279 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
280 | |
281 if (committed_size() < bytes) { | |
282 return false; | |
283 } | |
284 | |
285 char* const base_addr = committed_low_addr(); | |
286 bool result = special() || os::uncommit_memory(base_addr, bytes); | |
287 if (result) { | |
288 _committed_low_addr += bytes; | |
289 } | |
290 | |
291 return result; | |
292 } | |
293 | |
294 size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space, | |
295 size_t bytes) { | |
296 assert(is_aligned(bytes), "arg not aligned"); | |
297 assert(grows_down(), "this space must grow down"); | |
298 assert(other_space->grows_up(), "other space must grow up"); | |
299 assert(reserved_low_addr() == other_space->reserved_high_addr(), | |
300 "spaces not contiguous"); | |
301 assert(special() == other_space->special(), "one space is special in memory, the other is not"); | |
302 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this)); | |
303 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space)); | |
304 | |
305 size_t bytes_needed = bytes; | |
306 | |
307 // First use the uncommitted region in this space. | |
308 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed); | |
309 if (tmp_bytes > 0) { | |
310 if (expand_by(tmp_bytes)) { | |
311 bytes_needed -= tmp_bytes; | |
312 } else { | |
313 return 0; | |
314 } | |
315 } | |
316 | |
317 // Next take from the uncommitted region in the other space, and commit it. | |
318 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed); | |
319 if (tmp_bytes > 0) { | |
320 char* const commit_base = committed_low_addr() - tmp_bytes; | |
321 if (other_space->special() || | |
322 os::commit_memory(commit_base, tmp_bytes, alignment())) { | |
323 // Reduce the reserved region in the other space. | |
324 other_space->set_reserved(other_space->reserved_low_addr(), | |
325 other_space->reserved_high_addr() - tmp_bytes, | |
326 other_space->special()); | |
327 | |
328 // Grow both reserved and committed in this space. | |
329 _reserved_low_addr -= tmp_bytes; | |
330 _committed_low_addr -= tmp_bytes; | |
331 bytes_needed -= tmp_bytes; | |
332 } else { | |
333 return bytes - bytes_needed; | |
334 } | |
335 } | |
336 | |
337 // Finally take from the already committed region in the other space. | |
338 tmp_bytes = bytes_needed; | |
339 if (tmp_bytes > 0) { | |
340 // Reduce both committed and reserved in the other space. | |
341 other_space->set_committed(other_space->committed_low_addr(), | |
342 other_space->committed_high_addr() - tmp_bytes); | |
343 other_space->set_reserved(other_space->reserved_low_addr(), | |
344 other_space->reserved_high_addr() - tmp_bytes, | |
345 other_space->special()); | |
346 | |
347 // Grow both reserved and committed in this space. | |
348 _reserved_low_addr -= tmp_bytes; | |
349 _committed_low_addr -= tmp_bytes; | |
350 } | |
351 | |
352 return bytes; | |
353 } | |
354 | |
355 void | |
356 PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const { | |
357 st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]", | |
358 high_boundary(), low(), low_boundary()); | |
359 } |