Mercurial > hg > graal-compiler
comparison src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp @ 3771:842b840e67db
7046558: G1: concurrent marking optimizations
Summary: Some optimizations to improve the concurrent marking phase: specialize the main oop closure, make sure a few methods in the fast path are properly inlined, a few more bits and pieces, and some cosmetic fixes.
Reviewed-by: stefank, johnc
author | tonyp |
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date | Tue, 14 Jun 2011 10:33:43 -0400 |
parents | |
children | 23d434c6290d |
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3770:74cd10898bea | 3771:842b840e67db |
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1 /* | |
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP | |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 | |
31 inline void CMTask::push(oop obj) { | |
32 HeapWord* objAddr = (HeapWord*) obj; | |
33 assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); | |
34 assert(!_g1h->is_on_master_free_list( | |
35 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); | |
36 assert(!_g1h->is_obj_ill(obj), "invariant"); | |
37 assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); | |
38 | |
39 if (_cm->verbose_high()) { | |
40 gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj); | |
41 } | |
42 | |
43 if (!_task_queue->push(obj)) { | |
44 // The local task queue looks full. We need to push some entries | |
45 // to the global stack. | |
46 | |
47 if (_cm->verbose_medium()) { | |
48 gclog_or_tty->print_cr("[%d] task queue overflow, " | |
49 "moving entries to the global stack", | |
50 _task_id); | |
51 } | |
52 move_entries_to_global_stack(); | |
53 | |
54 // this should succeed since, even if we overflow the global | |
55 // stack, we should have definitely removed some entries from the | |
56 // local queue. So, there must be space on it. | |
57 bool success = _task_queue->push(obj); | |
58 assert(success, "invariant"); | |
59 } | |
60 | |
61 statsOnly( int tmp_size = _task_queue->size(); | |
62 if (tmp_size > _local_max_size) | |
63 _local_max_size = tmp_size; | |
64 ++_local_pushes ); | |
65 } | |
66 | |
67 // This determines whether the method below will check both the local | |
68 // and global fingers when determining whether to push on the stack a | |
69 // gray object (value 1) or whether it will only check the global one | |
70 // (value 0). The tradeoffs are that the former will be a bit more | |
71 // accurate and possibly push less on the stack, but it might also be | |
72 // a little bit slower. | |
73 | |
74 #define _CHECK_BOTH_FINGERS_ 1 | |
75 | |
76 inline void CMTask::deal_with_reference(oop obj) { | |
77 if (_cm->verbose_high()) { | |
78 gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT, | |
79 _task_id, (void*) obj); | |
80 } | |
81 | |
82 ++_refs_reached; | |
83 | |
84 HeapWord* objAddr = (HeapWord*) obj; | |
85 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); | |
86 if (_g1h->is_in_g1_reserved(objAddr)) { | |
87 assert(obj != NULL, "null check is implicit"); | |
88 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
89 // Only get the containing region if the object is not marked on the | |
90 // bitmap (otherwise, it's a waste of time since we won't do | |
91 // anything with it). | |
92 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
93 if (!hr->obj_allocated_since_next_marking(obj)) { | |
94 if (_cm->verbose_high()) { | |
95 gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked", | |
96 _task_id, (void*) obj); | |
97 } | |
98 | |
99 // we need to mark it first | |
100 if (_nextMarkBitMap->parMark(objAddr)) { | |
101 // No OrderAccess:store_load() is needed. It is implicit in the | |
102 // CAS done in parMark(objAddr) above | |
103 HeapWord* global_finger = _cm->finger(); | |
104 | |
105 #if _CHECK_BOTH_FINGERS_ | |
106 // we will check both the local and global fingers | |
107 | |
108 if (_finger != NULL && objAddr < _finger) { | |
109 if (_cm->verbose_high()) { | |
110 gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), " | |
111 "pushing it", _task_id, _finger); | |
112 } | |
113 push(obj); | |
114 } else if (_curr_region != NULL && objAddr < _region_limit) { | |
115 // do nothing | |
116 } else if (objAddr < global_finger) { | |
117 // Notice that the global finger might be moving forward | |
118 // concurrently. This is not a problem. In the worst case, we | |
119 // mark the object while it is above the global finger and, by | |
120 // the time we read the global finger, it has moved forward | |
121 // passed this object. In this case, the object will probably | |
122 // be visited when a task is scanning the region and will also | |
123 // be pushed on the stack. So, some duplicate work, but no | |
124 // correctness problems. | |
125 | |
126 if (_cm->verbose_high()) { | |
127 gclog_or_tty->print_cr("[%d] below the global finger " | |
128 "("PTR_FORMAT"), pushing it", | |
129 _task_id, global_finger); | |
130 } | |
131 push(obj); | |
132 } else { | |
133 // do nothing | |
134 } | |
135 #else // _CHECK_BOTH_FINGERS_ | |
136 // we will only check the global finger | |
137 | |
138 if (objAddr < global_finger) { | |
139 // see long comment above | |
140 | |
141 if (_cm->verbose_high()) { | |
142 gclog_or_tty->print_cr("[%d] below the global finger " | |
143 "("PTR_FORMAT"), pushing it", | |
144 _task_id, global_finger); | |
145 } | |
146 push(obj); | |
147 } | |
148 #endif // _CHECK_BOTH_FINGERS_ | |
149 } | |
150 } | |
151 } | |
152 } | |
153 } | |
154 | |
155 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |