Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.cpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | da91efe96a93 |
children | 8f07aa079343 |
rev | line source |
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0 | 1 /* |
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6964458: Reimplement class meta-data storage to use native memory
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
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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" | |
0 | 29 |
30 // If boundary moving is being used, create the young gen and old | |
31 // gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to | |
32 // the old behavior otherwise (with PSYoungGen and PSOldGen). | |
33 | |
34 AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs, | |
35 size_t init_low_byte_size, | |
36 size_t min_low_byte_size, | |
37 size_t max_low_byte_size, | |
38 size_t init_high_byte_size, | |
39 size_t min_high_byte_size, | |
40 size_t max_high_byte_size, | |
41 size_t alignment) : | |
42 _virtual_spaces(old_young_rs, min_low_byte_size, | |
43 min_high_byte_size, alignment) { | |
44 assert(min_low_byte_size <= init_low_byte_size && | |
45 init_low_byte_size <= max_low_byte_size, "Parameter check"); | |
46 assert(min_high_byte_size <= init_high_byte_size && | |
47 init_high_byte_size <= max_high_byte_size, "Parameter check"); | |
48 // Create the generations differently based on the option to | |
49 // move the boundary. | |
50 if (UseAdaptiveGCBoundary) { | |
51 // Initialize the adjoining virtual spaces. Then pass the | |
52 // a virtual to each generation for initialization of the | |
53 // generation. | |
54 | |
55 // Does the actual creation of the virtual spaces | |
56 _virtual_spaces.initialize(max_low_byte_size, | |
57 init_low_byte_size, | |
58 init_high_byte_size); | |
59 | |
60 // Place the young gen at the high end. Passes in the virtual space. | |
61 _young_gen = new ASPSYoungGen(_virtual_spaces.high(), | |
62 _virtual_spaces.high()->committed_size(), | |
63 min_high_byte_size, | |
64 _virtual_spaces.high_byte_size_limit()); | |
65 | |
66 // Place the old gen at the low end. Passes in the virtual space. | |
67 _old_gen = new ASPSOldGen(_virtual_spaces.low(), | |
68 _virtual_spaces.low()->committed_size(), | |
69 min_low_byte_size, | |
70 _virtual_spaces.low_byte_size_limit(), | |
71 "old", 1); | |
72 | |
73 young_gen()->initialize_work(); | |
74 assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), | |
75 "Consistency check"); | |
76 assert(old_young_rs.size() >= young_gen()->gen_size_limit(), | |
77 "Consistency check"); | |
78 | |
79 old_gen()->initialize_work("old", 1); | |
80 assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), | |
81 "Consistency check"); | |
82 assert(old_young_rs.size() >= old_gen()->gen_size_limit(), | |
83 "Consistency check"); | |
84 } else { | |
85 | |
86 // Layout the reserved space for the generations. | |
87 ReservedSpace old_rs = | |
88 virtual_spaces()->reserved_space().first_part(max_low_byte_size); | |
89 ReservedSpace heap_rs = | |
90 virtual_spaces()->reserved_space().last_part(max_low_byte_size); | |
91 ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); | |
92 assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); | |
93 | |
94 // Create the generations. Virtual spaces are not passed in. | |
95 _young_gen = new PSYoungGen(init_high_byte_size, | |
96 min_high_byte_size, | |
97 max_high_byte_size); | |
98 _old_gen = new PSOldGen(init_low_byte_size, | |
99 min_low_byte_size, | |
100 max_low_byte_size, | |
101 "old", 1); | |
102 | |
103 // The virtual spaces are created by the initialization of the gens. | |
104 _young_gen->initialize(young_rs, alignment); | |
105 assert(young_gen()->gen_size_limit() == young_rs.size(), | |
106 "Consistency check"); | |
107 _old_gen->initialize(old_rs, alignment, "old", 1); | |
108 assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); | |
109 } | |
110 } | |
111 | |
112 size_t AdjoiningGenerations::reserved_byte_size() { | |
113 return virtual_spaces()->reserved_space().size(); | |
114 } | |
115 | |
116 | |
117 // Make checks on the current sizes of the generations and | |
118 // the contraints on the sizes of the generations. Push | |
119 // up the boundary within the contraints. A partial | |
120 // push can occur. | |
121 void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { | |
122 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
123 | |
124 assert_lock_strong(ExpandHeap_lock); | |
125 assert_locked_or_safepoint(Heap_lock); | |
126 | |
127 // These sizes limit the amount the boundaries can move. Effectively, | |
128 // the generation says how much it is willing to yield to the other | |
129 // generation. | |
130 const size_t young_gen_available = young_gen()->available_for_contraction(); | |
131 const size_t old_gen_available = old_gen()->available_for_expansion(); | |
132 const size_t alignment = virtual_spaces()->alignment(); | |
133 size_t change_in_bytes = MIN3(young_gen_available, | |
134 old_gen_available, | |
135 align_size_up_(expand_in_bytes, alignment)); | |
136 | |
137 if (change_in_bytes == 0) { | |
138 return; | |
139 } | |
140 | |
141 if (TraceAdaptiveGCBoundary) { | |
142 gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); | |
143 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
144 expand_in_bytes, change_in_bytes); | |
145 if (!PrintHeapAtGC) { | |
146 Universe::print_on(gclog_or_tty); | |
147 } | |
148 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
149 old_gen()->max_gen_size()/K); | |
150 } | |
151 | |
152 // Move the boundary between the generations up (smaller young gen). | |
153 if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { | |
154 young_gen()->reset_after_change(); | |
155 old_gen()->reset_after_change(); | |
156 } | |
157 | |
158 // The total reserved for the generations should match the sum | |
159 // of the two even if the boundary is moving. | |
160 assert(reserved_byte_size() == | |
161 old_gen()->max_gen_size() + young_gen()->max_size(), | |
162 "Space is missing"); | |
163 young_gen()->space_invariants(); | |
164 old_gen()->space_invariants(); | |
165 | |
166 if (TraceAdaptiveGCBoundary) { | |
167 gclog_or_tty->print_cr("After expansion of old gen with boundary move"); | |
168 if (!PrintHeapAtGC) { | |
169 Universe::print_on(gclog_or_tty); | |
170 } | |
171 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
172 old_gen()->max_gen_size()/K); | |
173 } | |
174 } | |
175 | |
176 // See comments on request_old_gen_expansion() | |
177 bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { | |
178 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
179 | |
180 // If eden is not empty, the boundary can be moved but no advantage | |
181 // can be made of the move since eden cannot be moved. | |
182 if (!young_gen()->eden_space()->is_empty()) { | |
183 return false; | |
184 } | |
185 | |
186 | |
187 bool result = false; | |
188 const size_t young_gen_available = young_gen()->available_for_expansion(); | |
189 const size_t old_gen_available = old_gen()->available_for_contraction(); | |
190 const size_t alignment = virtual_spaces()->alignment(); | |
191 size_t change_in_bytes = MIN3(young_gen_available, | |
192 old_gen_available, | |
193 align_size_up_(expand_in_bytes, alignment)); | |
194 | |
195 if (change_in_bytes == 0) { | |
196 return false; | |
197 } | |
198 | |
199 if (TraceAdaptiveGCBoundary) { | |
200 gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); | |
201 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
202 expand_in_bytes, change_in_bytes); | |
203 if (!PrintHeapAtGC) { | |
204 Universe::print_on(gclog_or_tty); | |
205 } | |
206 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
207 young_gen()->max_size()/K); | |
208 } | |
209 | |
210 // Move the boundary between the generations down (smaller old gen). | |
211 MutexLocker x(ExpandHeap_lock); | |
212 if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { | |
213 young_gen()->reset_after_change(); | |
214 old_gen()->reset_after_change(); | |
215 result = true; | |
216 } | |
217 | |
218 // The total reserved for the generations should match the sum | |
219 // of the two even if the boundary is moving. | |
220 assert(reserved_byte_size() == | |
221 old_gen()->max_gen_size() + young_gen()->max_size(), | |
222 "Space is missing"); | |
223 young_gen()->space_invariants(); | |
224 old_gen()->space_invariants(); | |
225 | |
226 if (TraceAdaptiveGCBoundary) { | |
227 gclog_or_tty->print_cr("After expansion of young gen with boundary move"); | |
228 if (!PrintHeapAtGC) { | |
229 Universe::print_on(gclog_or_tty); | |
230 } | |
231 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
232 young_gen()->max_size()/K); | |
233 } | |
234 | |
235 return result; | |
236 } | |
237 | |
238 // Additional space is needed in the old generation. Try to move the boundary | |
239 // up to meet the need. Moves boundary up only | |
240 void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( | |
241 size_t desired_free_space) { | |
242 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
243 | |
244 // Stress testing. | |
245 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { | |
246 MutexLocker x(ExpandHeap_lock); | |
247 request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
248 } | |
249 | |
250 // Expand only if the entire generation is already committed. | |
251 if (old_gen()->virtual_space()->uncommitted_size() == 0) { | |
252 if (old_gen()->free_in_bytes() < desired_free_space) { | |
253 MutexLocker x(ExpandHeap_lock); | |
254 request_old_gen_expansion(desired_free_space); | |
255 } | |
256 } | |
257 } | |
258 | |
259 // See comment on adjust_boundary_for_old_gen_needss(). | |
260 // Adjust boundary down only. | |
261 void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, | |
262 size_t survivor_size) { | |
263 | |
264 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
265 | |
266 // Stress testing. | |
267 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { | |
268 request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
269 eden_size = young_gen()->eden_space()->capacity_in_bytes(); | |
270 } | |
271 | |
272 // Expand only if the entire generation is already committed. | |
273 if (young_gen()->virtual_space()->uncommitted_size() == 0) { | |
274 size_t desired_size = eden_size + 2 * survivor_size; | |
275 const size_t committed = young_gen()->virtual_space()->committed_size(); | |
276 if (desired_size > committed) { | |
277 request_young_gen_expansion(desired_size - committed); | |
278 } | |
279 } | |
280 } |