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annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2014, 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 * | |
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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" | |
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28 #include "gc_implementation/parallelScavenge/generationSizer.hpp" |
1972 | 29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.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, | |
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36 GenerationSizer* policy, |
0 | 37 size_t alignment) : |
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38 _virtual_spaces(old_young_rs, policy->min_gen1_size(), |
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39 policy->min_gen0_size(), alignment) { |
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40 size_t init_low_byte_size = policy->initial_gen1_size(); |
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41 size_t min_low_byte_size = policy->min_gen1_size(); |
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42 size_t max_low_byte_size = policy->max_gen1_size(); |
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43 size_t init_high_byte_size = policy->initial_gen0_size(); |
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44 size_t min_high_byte_size = policy->min_gen0_size(); |
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45 size_t max_high_byte_size = policy->max_gen0_size(); |
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46 |
0 | 47 assert(min_low_byte_size <= init_low_byte_size && |
48 init_low_byte_size <= max_low_byte_size, "Parameter check"); | |
49 assert(min_high_byte_size <= init_high_byte_size && | |
50 init_high_byte_size <= max_high_byte_size, "Parameter check"); | |
51 // Create the generations differently based on the option to | |
52 // move the boundary. | |
53 if (UseAdaptiveGCBoundary) { | |
54 // Initialize the adjoining virtual spaces. Then pass the | |
55 // a virtual to each generation for initialization of the | |
56 // generation. | |
57 | |
58 // Does the actual creation of the virtual spaces | |
59 _virtual_spaces.initialize(max_low_byte_size, | |
60 init_low_byte_size, | |
61 init_high_byte_size); | |
62 | |
63 // Place the young gen at the high end. Passes in the virtual space. | |
64 _young_gen = new ASPSYoungGen(_virtual_spaces.high(), | |
65 _virtual_spaces.high()->committed_size(), | |
66 min_high_byte_size, | |
67 _virtual_spaces.high_byte_size_limit()); | |
68 | |
69 // Place the old gen at the low end. Passes in the virtual space. | |
70 _old_gen = new ASPSOldGen(_virtual_spaces.low(), | |
71 _virtual_spaces.low()->committed_size(), | |
72 min_low_byte_size, | |
73 _virtual_spaces.low_byte_size_limit(), | |
74 "old", 1); | |
75 | |
76 young_gen()->initialize_work(); | |
77 assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), | |
78 "Consistency check"); | |
79 assert(old_young_rs.size() >= young_gen()->gen_size_limit(), | |
80 "Consistency check"); | |
81 | |
82 old_gen()->initialize_work("old", 1); | |
83 assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), | |
84 "Consistency check"); | |
85 assert(old_young_rs.size() >= old_gen()->gen_size_limit(), | |
86 "Consistency check"); | |
87 } else { | |
88 | |
89 // Layout the reserved space for the generations. | |
90 ReservedSpace old_rs = | |
91 virtual_spaces()->reserved_space().first_part(max_low_byte_size); | |
92 ReservedSpace heap_rs = | |
93 virtual_spaces()->reserved_space().last_part(max_low_byte_size); | |
94 ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); | |
95 assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); | |
96 | |
97 // Create the generations. Virtual spaces are not passed in. | |
98 _young_gen = new PSYoungGen(init_high_byte_size, | |
99 min_high_byte_size, | |
100 max_high_byte_size); | |
101 _old_gen = new PSOldGen(init_low_byte_size, | |
102 min_low_byte_size, | |
103 max_low_byte_size, | |
104 "old", 1); | |
105 | |
106 // The virtual spaces are created by the initialization of the gens. | |
107 _young_gen->initialize(young_rs, alignment); | |
108 assert(young_gen()->gen_size_limit() == young_rs.size(), | |
109 "Consistency check"); | |
110 _old_gen->initialize(old_rs, alignment, "old", 1); | |
111 assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); | |
112 } | |
113 } | |
114 | |
115 size_t AdjoiningGenerations::reserved_byte_size() { | |
116 return virtual_spaces()->reserved_space().size(); | |
117 } | |
118 | |
119 | |
120 // Make checks on the current sizes of the generations and | |
121 // the contraints on the sizes of the generations. Push | |
122 // up the boundary within the contraints. A partial | |
123 // push can occur. | |
124 void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { | |
125 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
126 | |
127 assert_lock_strong(ExpandHeap_lock); | |
128 assert_locked_or_safepoint(Heap_lock); | |
129 | |
130 // These sizes limit the amount the boundaries can move. Effectively, | |
131 // the generation says how much it is willing to yield to the other | |
132 // generation. | |
133 const size_t young_gen_available = young_gen()->available_for_contraction(); | |
134 const size_t old_gen_available = old_gen()->available_for_expansion(); | |
135 const size_t alignment = virtual_spaces()->alignment(); | |
136 size_t change_in_bytes = MIN3(young_gen_available, | |
137 old_gen_available, | |
138 align_size_up_(expand_in_bytes, alignment)); | |
139 | |
140 if (change_in_bytes == 0) { | |
141 return; | |
142 } | |
143 | |
144 if (TraceAdaptiveGCBoundary) { | |
145 gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); | |
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146 gclog_or_tty->print_cr(" Requested change: " SIZE_FORMAT_HEX " Attempted change: " SIZE_FORMAT_HEX, |
0 | 147 expand_in_bytes, change_in_bytes); |
148 if (!PrintHeapAtGC) { | |
149 Universe::print_on(gclog_or_tty); | |
150 } | |
151 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
152 old_gen()->max_gen_size()/K); | |
153 } | |
154 | |
155 // Move the boundary between the generations up (smaller young gen). | |
156 if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { | |
157 young_gen()->reset_after_change(); | |
158 old_gen()->reset_after_change(); | |
159 } | |
160 | |
161 // The total reserved for the generations should match the sum | |
162 // of the two even if the boundary is moving. | |
163 assert(reserved_byte_size() == | |
164 old_gen()->max_gen_size() + young_gen()->max_size(), | |
165 "Space is missing"); | |
166 young_gen()->space_invariants(); | |
167 old_gen()->space_invariants(); | |
168 | |
169 if (TraceAdaptiveGCBoundary) { | |
170 gclog_or_tty->print_cr("After expansion of old gen with boundary move"); | |
171 if (!PrintHeapAtGC) { | |
172 Universe::print_on(gclog_or_tty); | |
173 } | |
174 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
175 old_gen()->max_gen_size()/K); | |
176 } | |
177 } | |
178 | |
179 // See comments on request_old_gen_expansion() | |
180 bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { | |
181 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
182 | |
183 // If eden is not empty, the boundary can be moved but no advantage | |
184 // can be made of the move since eden cannot be moved. | |
185 if (!young_gen()->eden_space()->is_empty()) { | |
186 return false; | |
187 } | |
188 | |
189 | |
190 bool result = false; | |
191 const size_t young_gen_available = young_gen()->available_for_expansion(); | |
192 const size_t old_gen_available = old_gen()->available_for_contraction(); | |
193 const size_t alignment = virtual_spaces()->alignment(); | |
194 size_t change_in_bytes = MIN3(young_gen_available, | |
195 old_gen_available, | |
196 align_size_up_(expand_in_bytes, alignment)); | |
197 | |
198 if (change_in_bytes == 0) { | |
199 return false; | |
200 } | |
201 | |
202 if (TraceAdaptiveGCBoundary) { | |
203 gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); | |
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204 gclog_or_tty->print_cr(" Requested change: " SIZE_FORMAT_HEX " Attempted change: " SIZE_FORMAT_HEX, |
0 | 205 expand_in_bytes, change_in_bytes); |
206 if (!PrintHeapAtGC) { | |
207 Universe::print_on(gclog_or_tty); | |
208 } | |
209 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
210 young_gen()->max_size()/K); | |
211 } | |
212 | |
213 // Move the boundary between the generations down (smaller old gen). | |
214 MutexLocker x(ExpandHeap_lock); | |
215 if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { | |
216 young_gen()->reset_after_change(); | |
217 old_gen()->reset_after_change(); | |
218 result = true; | |
219 } | |
220 | |
221 // The total reserved for the generations should match the sum | |
222 // of the two even if the boundary is moving. | |
223 assert(reserved_byte_size() == | |
224 old_gen()->max_gen_size() + young_gen()->max_size(), | |
225 "Space is missing"); | |
226 young_gen()->space_invariants(); | |
227 old_gen()->space_invariants(); | |
228 | |
229 if (TraceAdaptiveGCBoundary) { | |
230 gclog_or_tty->print_cr("After expansion of young gen with boundary move"); | |
231 if (!PrintHeapAtGC) { | |
232 Universe::print_on(gclog_or_tty); | |
233 } | |
234 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
235 young_gen()->max_size()/K); | |
236 } | |
237 | |
238 return result; | |
239 } | |
240 | |
241 // Additional space is needed in the old generation. Try to move the boundary | |
242 // up to meet the need. Moves boundary up only | |
243 void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( | |
244 size_t desired_free_space) { | |
245 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
246 | |
247 // Stress testing. | |
248 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { | |
249 MutexLocker x(ExpandHeap_lock); | |
250 request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
251 } | |
252 | |
253 // Expand only if the entire generation is already committed. | |
254 if (old_gen()->virtual_space()->uncommitted_size() == 0) { | |
255 if (old_gen()->free_in_bytes() < desired_free_space) { | |
256 MutexLocker x(ExpandHeap_lock); | |
257 request_old_gen_expansion(desired_free_space); | |
258 } | |
259 } | |
260 } | |
261 | |
262 // See comment on adjust_boundary_for_old_gen_needss(). | |
263 // Adjust boundary down only. | |
264 void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, | |
265 size_t survivor_size) { | |
266 | |
267 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
268 | |
269 // Stress testing. | |
270 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { | |
271 request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
272 eden_size = young_gen()->eden_space()->capacity_in_bytes(); | |
273 } | |
274 | |
275 // Expand only if the entire generation is already committed. | |
276 if (young_gen()->virtual_space()->uncommitted_size() == 0) { | |
277 size_t desired_size = eden_size + 2 * survivor_size; | |
278 const size_t committed = young_gen()->virtual_space()->committed_size(); | |
279 if (desired_size > committed) { | |
280 request_young_gen_expansion(desired_size - committed); | |
281 } | |
282 } | |
283 } |