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comparison src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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));
74 if (reserved_low_addr() != NULL) {
75 if (special()) {
76 os::release_memory_special(reserved_low_addr(), reserved_size());
77 } else {
78 (void)os::release_memory(reserved_low_addr(), reserved_size());
79 }
80 }
81 _reserved_low_addr = _reserved_high_addr = NULL;
82 _committed_low_addr = _committed_high_addr = NULL;
83 _special = false;
84 }
85
86 bool PSVirtualSpace::expand_by(size_t bytes, bool pre_touch) {
87 assert(is_aligned(bytes), "arg not aligned");
88 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
89
90 if (uncommitted_size() < bytes) {
91 return false;
92 }
93
94 char* const base_addr = committed_high_addr();
95 bool result = special() || os::commit_memory(base_addr, bytes, alignment());
96 if (result) {
97 _committed_high_addr += bytes;
98 }
99
100 if (pre_touch || AlwaysPreTouch) {
101 for (char* curr = base_addr;
102 curr < _committed_high_addr;
103 curr += os::vm_page_size()) {
104 char tmp = *curr;
105 *curr = 0;
106 }
107 }
108
109 return result;
110 }
111
112 bool PSVirtualSpace::shrink_by(size_t bytes) {
113 assert(is_aligned(bytes), "arg not aligned");
114 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
115
116 if (committed_size() < bytes) {
117 return false;
118 }
119
120 char* const base_addr = committed_high_addr() - bytes;
121 bool result = special() || os::uncommit_memory(base_addr, bytes);
122 if (result) {
123 _committed_high_addr -= bytes;
124 }
125
126 return result;
127 }
128
129 size_t
130 PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) {
131 assert(is_aligned(bytes), "arg not aligned");
132 assert(grows_up(), "this space must grow up");
133 assert(other_space->grows_down(), "other space must grow down");
134 assert(reserved_high_addr() == other_space->reserved_low_addr(),
135 "spaces not contiguous");
136 assert(special() == other_space->special(), "one space is special, the other is not");
137 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
138 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
139
140 size_t bytes_needed = bytes;
141
142 // First use the uncommitted region in this space.
143 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
144 if (tmp_bytes > 0) {
145 if (expand_by(tmp_bytes)) {
146 bytes_needed -= tmp_bytes;
147 } else {
148 return 0;
149 }
150 }
151
152 // Next take from the uncommitted region in the other space, and commit it.
153 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
154 if (tmp_bytes > 0) {
155 char* const commit_base = committed_high_addr();
156 if (other_space->special() ||
157 os::commit_memory(commit_base, tmp_bytes, alignment())) {
158 // Reduce the reserved region in the other space.
159 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
160 other_space->reserved_high_addr(),
161 other_space->special());
162
163 // Grow both reserved and committed in this space.
164 _reserved_high_addr += tmp_bytes;
165 _committed_high_addr += tmp_bytes;
166 bytes_needed -= tmp_bytes;
167 } else {
168 return bytes - bytes_needed;
169 }
170 }
171
172 // Finally take from the already committed region in the other space.
173 tmp_bytes = bytes_needed;
174 if (tmp_bytes > 0) {
175 // Reduce both committed and reserved in the other space.
176 other_space->set_committed(other_space->committed_low_addr() + tmp_bytes,
177 other_space->committed_high_addr());
178 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
179 other_space->reserved_high_addr(),
180 other_space->special());
181
182 // Grow both reserved and committed in this space.
183 _reserved_high_addr += tmp_bytes;
184 _committed_high_addr += tmp_bytes;
185 }
186
187 return bytes;
188 }
189
190 #ifndef PRODUCT
191 bool PSVirtualSpace::is_aligned(size_t value, size_t align) {
192 const size_t tmp_value = value + align - 1;
193 const size_t mask = ~(align - 1);
194 return (tmp_value & mask) == value;
195 }
196
197 bool PSVirtualSpace::is_aligned(size_t value) const {
198 return is_aligned(value, alignment());
199 }
200
201 bool PSVirtualSpace::is_aligned(char* value) const {
202 return is_aligned((size_t)value);
203 }
204
205 void PSVirtualSpace::verify() const {
206 assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment");
207 assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr");
208 assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr");
209 assert(is_aligned(committed_low_addr()), "bad committed_low_addr");
210 assert(is_aligned(committed_high_addr()), "bad committed_high_addr");
211
212 // Reserved region must be non-empty or both addrs must be 0.
213 assert(reserved_low_addr() < reserved_high_addr() ||
214 reserved_low_addr() == NULL && reserved_high_addr() == NULL,
215 "bad reserved addrs");
216 assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs");
217
218 if (grows_up()) {
219 assert(reserved_low_addr() == committed_low_addr(), "bad low addrs");
220 assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs");
221 } else {
222 assert(reserved_high_addr() == committed_high_addr(), "bad high addrs");
223 assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs");
224 }
225 }
226
227 void PSVirtualSpace::print() const {
228 gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment="
229 SIZE_FORMAT "K grows %s%s",
230 this, alignment() / K, grows_up() ? "up" : "down",
231 special() ? " (pinned in memory)" : "");
232 gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K"
233 " [" PTR_FORMAT "," PTR_FORMAT "]"
234 " committed=" SIZE_FORMAT "K"
235 " [" PTR_FORMAT "," PTR_FORMAT "]",
236 reserved_size() / K,
237 reserved_low_addr(), reserved_high_addr(),
238 committed_size() / K,
239 committed_low_addr(), committed_high_addr());
240 }
241 #endif // #ifndef PRODUCT
242
243 void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const {
244 st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
245 low_boundary(), high(), high_boundary());
246 }
247
248 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs,
249 size_t alignment) :
250 PSVirtualSpace(alignment)
251 {
252 set_reserved(rs);
253 set_committed(reserved_high_addr(), reserved_high_addr());
254 DEBUG_ONLY(verify());
255 }
256
257 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) {
258 set_reserved(rs);
259 set_committed(reserved_high_addr(), reserved_high_addr());
260 DEBUG_ONLY(verify());
261 }
262
263 bool PSVirtualSpaceHighToLow::expand_by(size_t bytes, bool pre_touch) {
264 assert(is_aligned(bytes), "arg not aligned");
265 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
266
267 if (uncommitted_size() < bytes) {
268 return false;
269 }
270
271 char* const base_addr = committed_low_addr() - bytes;
272 bool result = special() || os::commit_memory(base_addr, bytes, alignment());
273 if (result) {
274 _committed_low_addr -= bytes;
275 }
276
277 if (pre_touch || AlwaysPreTouch) {
278 for (char* curr = base_addr;
279 curr < _committed_high_addr;
280 curr += os::vm_page_size()) {
281 char tmp = *curr;
282 *curr = 0;
283 }
284 }
285
286 return result;
287 }
288
289 bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) {
290 assert(is_aligned(bytes), "arg not aligned");
291 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
292
293 if (committed_size() < bytes) {
294 return false;
295 }
296
297 char* const base_addr = committed_low_addr();
298 bool result = special() || os::uncommit_memory(base_addr, bytes);
299 if (result) {
300 _committed_low_addr += bytes;
301 }
302
303 return result;
304 }
305
306 size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space,
307 size_t bytes) {
308 assert(is_aligned(bytes), "arg not aligned");
309 assert(grows_down(), "this space must grow down");
310 assert(other_space->grows_up(), "other space must grow up");
311 assert(reserved_low_addr() == other_space->reserved_high_addr(),
312 "spaces not contiguous");
313 assert(special() == other_space->special(), "one space is special in memory, the other is not");
314 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
315 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
316
317 size_t bytes_needed = bytes;
318
319 // First use the uncommitted region in this space.
320 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
321 if (tmp_bytes > 0) {
322 if (expand_by(tmp_bytes)) {
323 bytes_needed -= tmp_bytes;
324 } else {
325 return 0;
326 }
327 }
328
329 // Next take from the uncommitted region in the other space, and commit it.
330 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
331 if (tmp_bytes > 0) {
332 char* const commit_base = committed_low_addr() - tmp_bytes;
333 if (other_space->special() ||
334 os::commit_memory(commit_base, tmp_bytes, alignment())) {
335 // Reduce the reserved region in the other space.
336 other_space->set_reserved(other_space->reserved_low_addr(),
337 other_space->reserved_high_addr() - tmp_bytes,
338 other_space->special());
339
340 // Grow both reserved and committed in this space.
341 _reserved_low_addr -= tmp_bytes;
342 _committed_low_addr -= tmp_bytes;
343 bytes_needed -= tmp_bytes;
344 } else {
345 return bytes - bytes_needed;
346 }
347 }
348
349 // Finally take from the already committed region in the other space.
350 tmp_bytes = bytes_needed;
351 if (tmp_bytes > 0) {
352 // Reduce both committed and reserved in the other space.
353 other_space->set_committed(other_space->committed_low_addr(),
354 other_space->committed_high_addr() - tmp_bytes);
355 other_space->set_reserved(other_space->reserved_low_addr(),
356 other_space->reserved_high_addr() - tmp_bytes,
357 other_space->special());
358
359 // Grow both reserved and committed in this space.
360 _reserved_low_addr -= tmp_bytes;
361 _committed_low_addr -= tmp_bytes;
362 }
363
364 return bytes;
365 }
366
367 void
368 PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const {
369 st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]",
370 high_boundary(), low(), low_boundary());
371 }