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annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.cpp @ 2260:850b2295a494
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author | kvn |
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date | Mon, 14 Feb 2011 14:36:29 -0800 |
parents | f95d63e2154a |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
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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). | |
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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/adjoiningGenerations.hpp" | |
27 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
28 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
29 #include "gc_implementation/parallelScavenge/psPermGen.hpp" | |
0 | 30 |
31 // If boundary moving is being used, create the young gen and old | |
32 // gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to | |
33 // the old behavior otherwise (with PSYoungGen and PSOldGen). | |
34 | |
35 AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs, | |
36 size_t init_low_byte_size, | |
37 size_t min_low_byte_size, | |
38 size_t max_low_byte_size, | |
39 size_t init_high_byte_size, | |
40 size_t min_high_byte_size, | |
41 size_t max_high_byte_size, | |
42 size_t alignment) : | |
43 _virtual_spaces(old_young_rs, min_low_byte_size, | |
44 min_high_byte_size, alignment) { | |
45 assert(min_low_byte_size <= init_low_byte_size && | |
46 init_low_byte_size <= max_low_byte_size, "Parameter check"); | |
47 assert(min_high_byte_size <= init_high_byte_size && | |
48 init_high_byte_size <= max_high_byte_size, "Parameter check"); | |
49 // Create the generations differently based on the option to | |
50 // move the boundary. | |
51 if (UseAdaptiveGCBoundary) { | |
52 // Initialize the adjoining virtual spaces. Then pass the | |
53 // a virtual to each generation for initialization of the | |
54 // generation. | |
55 | |
56 // Does the actual creation of the virtual spaces | |
57 _virtual_spaces.initialize(max_low_byte_size, | |
58 init_low_byte_size, | |
59 init_high_byte_size); | |
60 | |
61 // Place the young gen at the high end. Passes in the virtual space. | |
62 _young_gen = new ASPSYoungGen(_virtual_spaces.high(), | |
63 _virtual_spaces.high()->committed_size(), | |
64 min_high_byte_size, | |
65 _virtual_spaces.high_byte_size_limit()); | |
66 | |
67 // Place the old gen at the low end. Passes in the virtual space. | |
68 _old_gen = new ASPSOldGen(_virtual_spaces.low(), | |
69 _virtual_spaces.low()->committed_size(), | |
70 min_low_byte_size, | |
71 _virtual_spaces.low_byte_size_limit(), | |
72 "old", 1); | |
73 | |
74 young_gen()->initialize_work(); | |
75 assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), | |
76 "Consistency check"); | |
77 assert(old_young_rs.size() >= young_gen()->gen_size_limit(), | |
78 "Consistency check"); | |
79 | |
80 old_gen()->initialize_work("old", 1); | |
81 assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), | |
82 "Consistency check"); | |
83 assert(old_young_rs.size() >= old_gen()->gen_size_limit(), | |
84 "Consistency check"); | |
85 } else { | |
86 | |
87 // Layout the reserved space for the generations. | |
88 ReservedSpace old_rs = | |
89 virtual_spaces()->reserved_space().first_part(max_low_byte_size); | |
90 ReservedSpace heap_rs = | |
91 virtual_spaces()->reserved_space().last_part(max_low_byte_size); | |
92 ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); | |
93 assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); | |
94 | |
95 // Create the generations. Virtual spaces are not passed in. | |
96 _young_gen = new PSYoungGen(init_high_byte_size, | |
97 min_high_byte_size, | |
98 max_high_byte_size); | |
99 _old_gen = new PSOldGen(init_low_byte_size, | |
100 min_low_byte_size, | |
101 max_low_byte_size, | |
102 "old", 1); | |
103 | |
104 // The virtual spaces are created by the initialization of the gens. | |
105 _young_gen->initialize(young_rs, alignment); | |
106 assert(young_gen()->gen_size_limit() == young_rs.size(), | |
107 "Consistency check"); | |
108 _old_gen->initialize(old_rs, alignment, "old", 1); | |
109 assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); | |
110 } | |
111 } | |
112 | |
113 size_t AdjoiningGenerations::reserved_byte_size() { | |
114 return virtual_spaces()->reserved_space().size(); | |
115 } | |
116 | |
117 | |
118 // Make checks on the current sizes of the generations and | |
119 // the contraints on the sizes of the generations. Push | |
120 // up the boundary within the contraints. A partial | |
121 // push can occur. | |
122 void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { | |
123 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
124 | |
125 assert_lock_strong(ExpandHeap_lock); | |
126 assert_locked_or_safepoint(Heap_lock); | |
127 | |
128 // These sizes limit the amount the boundaries can move. Effectively, | |
129 // the generation says how much it is willing to yield to the other | |
130 // generation. | |
131 const size_t young_gen_available = young_gen()->available_for_contraction(); | |
132 const size_t old_gen_available = old_gen()->available_for_expansion(); | |
133 const size_t alignment = virtual_spaces()->alignment(); | |
134 size_t change_in_bytes = MIN3(young_gen_available, | |
135 old_gen_available, | |
136 align_size_up_(expand_in_bytes, alignment)); | |
137 | |
138 if (change_in_bytes == 0) { | |
139 return; | |
140 } | |
141 | |
142 if (TraceAdaptiveGCBoundary) { | |
143 gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); | |
144 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
145 expand_in_bytes, change_in_bytes); | |
146 if (!PrintHeapAtGC) { | |
147 Universe::print_on(gclog_or_tty); | |
148 } | |
149 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
150 old_gen()->max_gen_size()/K); | |
151 } | |
152 | |
153 // Move the boundary between the generations up (smaller young gen). | |
154 if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { | |
155 young_gen()->reset_after_change(); | |
156 old_gen()->reset_after_change(); | |
157 } | |
158 | |
159 // The total reserved for the generations should match the sum | |
160 // of the two even if the boundary is moving. | |
161 assert(reserved_byte_size() == | |
162 old_gen()->max_gen_size() + young_gen()->max_size(), | |
163 "Space is missing"); | |
164 young_gen()->space_invariants(); | |
165 old_gen()->space_invariants(); | |
166 | |
167 if (TraceAdaptiveGCBoundary) { | |
168 gclog_or_tty->print_cr("After expansion of old gen with boundary move"); | |
169 if (!PrintHeapAtGC) { | |
170 Universe::print_on(gclog_or_tty); | |
171 } | |
172 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
173 old_gen()->max_gen_size()/K); | |
174 } | |
175 } | |
176 | |
177 // See comments on request_old_gen_expansion() | |
178 bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { | |
179 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
180 | |
181 // If eden is not empty, the boundary can be moved but no advantage | |
182 // can be made of the move since eden cannot be moved. | |
183 if (!young_gen()->eden_space()->is_empty()) { | |
184 return false; | |
185 } | |
186 | |
187 | |
188 bool result = false; | |
189 const size_t young_gen_available = young_gen()->available_for_expansion(); | |
190 const size_t old_gen_available = old_gen()->available_for_contraction(); | |
191 const size_t alignment = virtual_spaces()->alignment(); | |
192 size_t change_in_bytes = MIN3(young_gen_available, | |
193 old_gen_available, | |
194 align_size_up_(expand_in_bytes, alignment)); | |
195 | |
196 if (change_in_bytes == 0) { | |
197 return false; | |
198 } | |
199 | |
200 if (TraceAdaptiveGCBoundary) { | |
201 gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); | |
202 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
203 expand_in_bytes, change_in_bytes); | |
204 if (!PrintHeapAtGC) { | |
205 Universe::print_on(gclog_or_tty); | |
206 } | |
207 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
208 young_gen()->max_size()/K); | |
209 } | |
210 | |
211 // Move the boundary between the generations down (smaller old gen). | |
212 MutexLocker x(ExpandHeap_lock); | |
213 if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { | |
214 young_gen()->reset_after_change(); | |
215 old_gen()->reset_after_change(); | |
216 result = true; | |
217 } | |
218 | |
219 // The total reserved for the generations should match the sum | |
220 // of the two even if the boundary is moving. | |
221 assert(reserved_byte_size() == | |
222 old_gen()->max_gen_size() + young_gen()->max_size(), | |
223 "Space is missing"); | |
224 young_gen()->space_invariants(); | |
225 old_gen()->space_invariants(); | |
226 | |
227 if (TraceAdaptiveGCBoundary) { | |
228 gclog_or_tty->print_cr("After expansion of young gen with boundary move"); | |
229 if (!PrintHeapAtGC) { | |
230 Universe::print_on(gclog_or_tty); | |
231 } | |
232 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
233 young_gen()->max_size()/K); | |
234 } | |
235 | |
236 return result; | |
237 } | |
238 | |
239 // Additional space is needed in the old generation. Try to move the boundary | |
240 // up to meet the need. Moves boundary up only | |
241 void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( | |
242 size_t desired_free_space) { | |
243 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
244 | |
245 // Stress testing. | |
246 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { | |
247 MutexLocker x(ExpandHeap_lock); | |
248 request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
249 } | |
250 | |
251 // Expand only if the entire generation is already committed. | |
252 if (old_gen()->virtual_space()->uncommitted_size() == 0) { | |
253 if (old_gen()->free_in_bytes() < desired_free_space) { | |
254 MutexLocker x(ExpandHeap_lock); | |
255 request_old_gen_expansion(desired_free_space); | |
256 } | |
257 } | |
258 } | |
259 | |
260 // See comment on adjust_boundary_for_old_gen_needss(). | |
261 // Adjust boundary down only. | |
262 void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, | |
263 size_t survivor_size) { | |
264 | |
265 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
266 | |
267 // Stress testing. | |
268 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { | |
269 request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
270 eden_size = young_gen()->eden_space()->capacity_in_bytes(); | |
271 } | |
272 | |
273 // Expand only if the entire generation is already committed. | |
274 if (young_gen()->virtual_space()->uncommitted_size() == 0) { | |
275 size_t desired_size = eden_size + 2 * survivor_size; | |
276 const size_t committed = young_gen()->virtual_space()->committed_size(); | |
277 if (desired_size > committed) { | |
278 request_young_gen_expansion(desired_size - committed); | |
279 } | |
280 } | |
281 } |