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comparison src/share/vm/gc_implementation/g1/g1AllocRegion.inline.hpp @ 2433:abdfc822206f

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7023069: G1: Introduce symmetric locking in the slow allocation path 7023151: G1: refactor the code that operates on _cur_alloc_region to be re-used for allocs by the GC threads 7018286: G1: humongous allocation attempts should take the GC locker into account Summary: First, this change replaces the asymmetric locking scheme in the G1 slow alloc path by a summetric one. Second, it factors out the code that operates on _cur_alloc_region so that it can be re-used for allocations by the GC threads in the future. Reviewed-by: stefank, brutisso, johnc
author tonyp
date Wed, 30 Mar 2011 10:26:59 -0400
parents
children 63a4eb8bcd23 1526a938e670
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2432:455328d90876 2433:abdfc822206f
1 /*
2 * Copyright (c) 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_G1ALLOCREGION_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP
27
28 #include "gc_implementation/g1/g1AllocRegion.hpp"
29
30 inline HeapWord* G1AllocRegion::allocate(HeapRegion* alloc_region,
31 size_t word_size,
32 bool bot_updates) {
33 assert(alloc_region != NULL, err_msg("pre-condition"));
34
35 if (!bot_updates) {
36 return alloc_region->allocate_no_bot_updates(word_size);
37 } else {
38 return alloc_region->allocate(word_size);
39 }
40 }
41
42 inline HeapWord* G1AllocRegion::par_allocate(HeapRegion* alloc_region,
43 size_t word_size,
44 bool bot_updates) {
45 assert(alloc_region != NULL, err_msg("pre-condition"));
46 assert(!alloc_region->is_empty(), err_msg("pre-condition"));
47
48 if (!bot_updates) {
49 return alloc_region->par_allocate_no_bot_updates(word_size);
50 } else {
51 return alloc_region->par_allocate(word_size);
52 }
53 }
54
55 inline HeapWord* G1AllocRegion::attempt_allocation(size_t word_size,
56 bool bot_updates) {
57 assert(bot_updates == _bot_updates, ar_ext_msg(this, "pre-condition"));
58
59 HeapRegion* alloc_region = _alloc_region;
60 assert(alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));
61
62 HeapWord* result = par_allocate(alloc_region, word_size, bot_updates);
63 if (result != NULL) {
64 trace("alloc", word_size, result);
65 return result;
66 }
67 trace("alloc failed", word_size);
68 return NULL;
69 }
70
71 inline HeapWord* G1AllocRegion::attempt_allocation_locked(size_t word_size,
72 bool bot_updates) {
73 // First we have to tedo the allocation, assuming we're holding the
74 // appropriate lock, in case another thread changed the region while
75 // we were waiting to get the lock.
76 HeapWord* result = attempt_allocation(word_size, bot_updates);
77 if (result != NULL) {
78 return result;
79 }
80
81 retire(true /* fill_up */);
82 result = new_alloc_region_and_allocate(word_size, false /* force */);
83 if (result != NULL) {
84 trace("alloc locked (second attempt)", word_size, result);
85 return result;
86 }
87 trace("alloc locked failed", word_size);
88 return NULL;
89 }
90
91 inline HeapWord* G1AllocRegion::attempt_allocation_force(size_t word_size,
92 bool bot_updates) {
93 assert(bot_updates == _bot_updates, ar_ext_msg(this, "pre-condition"));
94 assert(_alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));
95
96 trace("forcing alloc");
97 HeapWord* result = new_alloc_region_and_allocate(word_size, true /* force */);
98 if (result != NULL) {
99 trace("alloc forced", word_size, result);
100 return result;
101 }
102 trace("alloc forced failed", word_size);
103 return NULL;
104 }
105
106 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP