Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp @ 4909:95f6641e38e0
7144296: PS: Optimize nmethods processing
Summary: Prunes scavenge roots in code list every young GC, promote objects directly pointed by the code immediately
Reviewed-by: johnc, jcoomes
author | iveresov |
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date | Fri, 10 Feb 2012 17:40:20 -0800 |
parents | f95d63e2154a |
children | 8a729074feae |
rev | line source |
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0 | 1 /* |
4909 | 2 * Copyright (c) 2002, 2012, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" | |
29 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
30 | |
0 | 31 inline PSPromotionManager* PSPromotionManager::manager_array(int index) { |
32 assert(_manager_array != NULL, "access of NULL manager_array"); | |
33 assert(index >= 0 && index <= (int)ParallelGCThreads, "out of range manager_array access"); | |
34 return _manager_array[index]; | |
35 } | |
36 | |
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37 template <class T> |
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38 inline void PSPromotionManager::claim_or_forward_internal_depth(T* p) { |
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39 if (p != NULL) { // XXX: error if p != NULL here |
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40 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 41 if (o->is_forwarded()) { |
42 o = o->forwardee(); | |
43 // Card mark | |
44 if (PSScavenge::is_obj_in_young((HeapWord*) o)) { | |
45 PSScavenge::card_table()->inline_write_ref_field_gc(p, o); | |
46 } | |
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47 oopDesc::encode_store_heap_oop_not_null(p, o); |
0 | 48 } else { |
49 push_depth(p); | |
50 } | |
51 } | |
52 } | |
53 | |
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54 template <class T> |
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55 inline void PSPromotionManager::claim_or_forward_depth(T* p) { |
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56 assert(PSScavenge::should_scavenge(p, true), "revisiting object?"); |
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57 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, |
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58 "Sanity"); |
0 | 59 assert(Universe::heap()->is_in(p), "pointer outside heap"); |
60 | |
61 claim_or_forward_internal_depth(p); | |
62 } | |
63 | |
4909 | 64 // |
65 // This method is pretty bulky. It would be nice to split it up | |
66 // into smaller submethods, but we need to be careful not to hurt | |
67 // performance. | |
68 // | |
69 template<bool promote_immediately> | |
70 oop PSPromotionManager::copy_to_survivor_space(oop o) { | |
71 assert(PSScavenge::should_scavenge(&o), "Sanity"); | |
72 | |
73 oop new_obj = NULL; | |
74 | |
75 // NOTE! We must be very careful with any methods that access the mark | |
76 // in o. There may be multiple threads racing on it, and it may be forwarded | |
77 // at any time. Do not use oop methods for accessing the mark! | |
78 markOop test_mark = o->mark(); | |
79 | |
80 // The same test as "o->is_forwarded()" | |
81 if (!test_mark->is_marked()) { | |
82 bool new_obj_is_tenured = false; | |
83 size_t new_obj_size = o->size(); | |
84 | |
85 if (!promote_immediately) { | |
86 // Find the objects age, MT safe. | |
87 int age = (test_mark->has_displaced_mark_helper() /* o->has_displaced_mark() */) ? | |
88 test_mark->displaced_mark_helper()->age() : test_mark->age(); | |
89 | |
90 // Try allocating obj in to-space (unless too old) | |
91 if (age < PSScavenge::tenuring_threshold()) { | |
92 new_obj = (oop) _young_lab.allocate(new_obj_size); | |
93 if (new_obj == NULL && !_young_gen_is_full) { | |
94 // Do we allocate directly, or flush and refill? | |
95 if (new_obj_size > (YoungPLABSize / 2)) { | |
96 // Allocate this object directly | |
97 new_obj = (oop)young_space()->cas_allocate(new_obj_size); | |
98 } else { | |
99 // Flush and fill | |
100 _young_lab.flush(); | |
101 | |
102 HeapWord* lab_base = young_space()->cas_allocate(YoungPLABSize); | |
103 if (lab_base != NULL) { | |
104 _young_lab.initialize(MemRegion(lab_base, YoungPLABSize)); | |
105 // Try the young lab allocation again. | |
106 new_obj = (oop) _young_lab.allocate(new_obj_size); | |
107 } else { | |
108 _young_gen_is_full = true; | |
109 } | |
110 } | |
111 } | |
112 } | |
113 } | |
114 | |
115 // Otherwise try allocating obj tenured | |
116 if (new_obj == NULL) { | |
117 #ifndef PRODUCT | |
118 if (Universe::heap()->promotion_should_fail()) { | |
119 return oop_promotion_failed(o, test_mark); | |
120 } | |
121 #endif // #ifndef PRODUCT | |
122 | |
123 new_obj = (oop) _old_lab.allocate(new_obj_size); | |
124 new_obj_is_tenured = true; | |
125 | |
126 if (new_obj == NULL) { | |
127 if (!_old_gen_is_full) { | |
128 // Do we allocate directly, or flush and refill? | |
129 if (new_obj_size > (OldPLABSize / 2)) { | |
130 // Allocate this object directly | |
131 new_obj = (oop)old_gen()->cas_allocate(new_obj_size); | |
132 } else { | |
133 // Flush and fill | |
134 _old_lab.flush(); | |
135 | |
136 HeapWord* lab_base = old_gen()->cas_allocate(OldPLABSize); | |
137 if(lab_base != NULL) { | |
138 _old_lab.initialize(MemRegion(lab_base, OldPLABSize)); | |
139 // Try the old lab allocation again. | |
140 new_obj = (oop) _old_lab.allocate(new_obj_size); | |
141 } | |
142 } | |
143 } | |
144 | |
145 // This is the promotion failed test, and code handling. | |
146 // The code belongs here for two reasons. It is slightly | |
147 // different thatn the code below, and cannot share the | |
148 // CAS testing code. Keeping the code here also minimizes | |
149 // the impact on the common case fast path code. | |
150 | |
151 if (new_obj == NULL) { | |
152 _old_gen_is_full = true; | |
153 return oop_promotion_failed(o, test_mark); | |
154 } | |
155 } | |
156 } | |
157 | |
158 assert(new_obj != NULL, "allocation should have succeeded"); | |
159 | |
160 // Copy obj | |
161 Copy::aligned_disjoint_words((HeapWord*)o, (HeapWord*)new_obj, new_obj_size); | |
162 | |
163 // Now we have to CAS in the header. | |
164 if (o->cas_forward_to(new_obj, test_mark)) { | |
165 // We won any races, we "own" this object. | |
166 assert(new_obj == o->forwardee(), "Sanity"); | |
167 | |
168 // Increment age if obj still in new generation. Now that | |
169 // we're dealing with a markOop that cannot change, it is | |
170 // okay to use the non mt safe oop methods. | |
171 if (!new_obj_is_tenured) { | |
172 new_obj->incr_age(); | |
173 assert(young_space()->contains(new_obj), "Attempt to push non-promoted obj"); | |
174 } | |
175 | |
176 // Do the size comparison first with new_obj_size, which we | |
177 // already have. Hopefully, only a few objects are larger than | |
178 // _min_array_size_for_chunking, and most of them will be arrays. | |
179 // So, the is->objArray() test would be very infrequent. | |
180 if (new_obj_size > _min_array_size_for_chunking && | |
181 new_obj->is_objArray() && | |
182 PSChunkLargeArrays) { | |
183 // we'll chunk it | |
184 oop* const masked_o = mask_chunked_array_oop(o); | |
185 push_depth(masked_o); | |
186 TASKQUEUE_STATS_ONLY(++_arrays_chunked; ++_masked_pushes); | |
187 } else { | |
188 // we'll just push its contents | |
189 new_obj->push_contents(this); | |
190 } | |
191 } else { | |
192 // We lost, someone else "owns" this object | |
193 guarantee(o->is_forwarded(), "Object must be forwarded if the cas failed."); | |
194 | |
195 // Try to deallocate the space. If it was directly allocated we cannot | |
196 // deallocate it, so we have to test. If the deallocation fails, | |
197 // overwrite with a filler object. | |
198 if (new_obj_is_tenured) { | |
199 if (!_old_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) { | |
200 CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size); | |
201 } | |
202 } else if (!_young_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) { | |
203 CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size); | |
204 } | |
205 | |
206 // don't update this before the unallocation! | |
207 new_obj = o->forwardee(); | |
208 } | |
209 } else { | |
210 assert(o->is_forwarded(), "Sanity"); | |
211 new_obj = o->forwardee(); | |
212 } | |
213 | |
214 #ifdef DEBUG | |
215 // This code must come after the CAS test, or it will print incorrect | |
216 // information. | |
217 if (TraceScavenge) { | |
218 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (" SIZE_FORMAT ")}", | |
219 PSScavenge::should_scavenge(&new_obj) ? "copying" : "tenuring", | |
220 new_obj->blueprint()->internal_name(), o, new_obj, new_obj->size()); | |
221 } | |
222 #endif | |
223 | |
224 return new_obj; | |
225 } | |
226 | |
227 | |
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228 inline void PSPromotionManager::process_popped_location_depth(StarTask p) { |
0 | 229 if (is_oop_masked(p)) { |
230 assert(PSChunkLargeArrays, "invariant"); | |
231 oop const old = unmask_chunked_array_oop(p); | |
232 process_array_chunk(old); | |
233 } else { | |
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234 if (p.is_narrow()) { |
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235 assert(UseCompressedOops, "Error"); |
4909 | 236 PSScavenge::copy_and_push_safe_barrier<narrowOop, /*promote_immediately=*/false>(this, p); |
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237 } else { |
4909 | 238 PSScavenge::copy_and_push_safe_barrier<oop, /*promote_immediately=*/false>(this, p); |
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239 } |
0 | 240 } |
241 } | |
1665 | 242 |
243 #if TASKQUEUE_STATS | |
244 void PSPromotionManager::record_steal(StarTask& p) { | |
245 if (is_oop_masked(p)) { | |
246 ++_masked_steals; | |
247 } | |
248 } | |
249 #endif // TASKQUEUE_STATS | |
1972 | 250 |
251 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP |