Mercurial > hg > graal-jvmci-8
comparison src/share/vm/gc_implementation/concurrentMarkSweep/adaptiveFreeList.cpp @ 6885:685df3c6f84b
7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair
author | jmasa |
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date | Tue, 18 Sep 2012 23:35:42 -0700 |
parents | |
children | 7c5a1b62f53d |
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6877:d0e7716b179e | 6885:685df3c6f84b |
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1 /* | |
2 * Copyright (c) 2012, 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 #include "precompiled.hpp" | |
26 #include "gc_implementation/concurrentMarkSweep/adaptiveFreeList.hpp" | |
27 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" | |
28 #include "memory/freeBlockDictionary.hpp" | |
29 #include "memory/sharedHeap.hpp" | |
30 #include "runtime/globals.hpp" | |
31 #include "runtime/mutex.hpp" | |
32 #include "runtime/vmThread.hpp" | |
33 | |
34 template <> | |
35 void AdaptiveFreeList<FreeChunk>::print_on(outputStream* st, const char* c) const { | |
36 if (c != NULL) { | |
37 st->print("%16s", c); | |
38 } else { | |
39 st->print(SIZE_FORMAT_W(16), size()); | |
40 } | |
41 st->print("\t" | |
42 SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" | |
43 SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\n", | |
44 bfr_surp(), surplus(), desired(), prev_sweep(), before_sweep(), | |
45 count(), coal_births(), coal_deaths(), split_births(), split_deaths()); | |
46 } | |
47 | |
48 template <class Chunk> | |
49 AdaptiveFreeList<Chunk>::AdaptiveFreeList() : FreeList<Chunk>(), _hint(0) { | |
50 init_statistics(); | |
51 } | |
52 | |
53 template <class Chunk> | |
54 AdaptiveFreeList<Chunk>::AdaptiveFreeList(Chunk* fc) : FreeList<Chunk>(fc), _hint(0) { | |
55 init_statistics(); | |
56 #ifndef PRODUCT | |
57 _allocation_stats.set_returned_bytes(size() * HeapWordSize); | |
58 #endif | |
59 } | |
60 | |
61 template <class Chunk> | |
62 void AdaptiveFreeList<Chunk>::initialize() { | |
63 FreeList<Chunk>::initialize(); | |
64 set_hint(0); | |
65 init_statistics(true /* split_birth */); | |
66 } | |
67 | |
68 template <class Chunk> | |
69 void AdaptiveFreeList<Chunk>::reset(size_t hint) { | |
70 FreeList<Chunk>::reset(); | |
71 set_hint(hint); | |
72 } | |
73 | |
74 #ifndef PRODUCT | |
75 template <class Chunk> | |
76 void AdaptiveFreeList<Chunk>::assert_proper_lock_protection_work() const { | |
77 assert(protecting_lock() != NULL, "Don't call this directly"); | |
78 assert(ParallelGCThreads > 0, "Don't call this directly"); | |
79 Thread* thr = Thread::current(); | |
80 if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { | |
81 // assert that we are holding the freelist lock | |
82 } else if (thr->is_GC_task_thread()) { | |
83 assert(protecting_lock()->owned_by_self(), "FreeList RACE DETECTED"); | |
84 } else if (thr->is_Java_thread()) { | |
85 assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); | |
86 } else { | |
87 ShouldNotReachHere(); // unaccounted thread type? | |
88 } | |
89 } | |
90 #endif | |
91 template <class Chunk> | |
92 void AdaptiveFreeList<Chunk>::init_statistics(bool split_birth) { | |
93 _allocation_stats.initialize(split_birth); | |
94 } | |
95 | |
96 template <class Chunk> | |
97 size_t AdaptiveFreeList<Chunk>::get_better_size() { | |
98 | |
99 // A candidate chunk has been found. If it is already under | |
100 // populated and there is a hinT, REturn the hint(). Else | |
101 // return the size of this chunk. | |
102 if (surplus() <= 0) { | |
103 if (hint() != 0) { | |
104 return hint(); | |
105 } else { | |
106 return size(); | |
107 } | |
108 } else { | |
109 // This list has a surplus so use it. | |
110 return size(); | |
111 } | |
112 } | |
113 | |
114 | |
115 template <class Chunk> | |
116 void AdaptiveFreeList<Chunk>::return_chunk_at_head(Chunk* chunk) { | |
117 assert_proper_lock_protection(); | |
118 return_chunk_at_head(chunk, true); | |
119 } | |
120 | |
121 template <class Chunk> | |
122 void AdaptiveFreeList<Chunk>::return_chunk_at_head(Chunk* chunk, bool record_return) { | |
123 FreeList<Chunk>::return_chunk_at_head(chunk, record_return); | |
124 #ifdef ASSERT | |
125 if (record_return) { | |
126 increment_returned_bytes_by(size()*HeapWordSize); | |
127 } | |
128 #endif | |
129 } | |
130 | |
131 template <class Chunk> | |
132 void AdaptiveFreeList<Chunk>::return_chunk_at_tail(Chunk* chunk) { | |
133 return_chunk_at_tail(chunk, true); | |
134 } | |
135 | |
136 template <class Chunk> | |
137 void AdaptiveFreeList<Chunk>::return_chunk_at_tail(Chunk* chunk, bool record_return) { | |
138 FreeList<Chunk>::return_chunk_at_tail(chunk, record_return); | |
139 #ifdef ASSERT | |
140 if (record_return) { | |
141 increment_returned_bytes_by(size()*HeapWordSize); | |
142 } | |
143 #endif | |
144 } | |
145 | |
146 #ifndef PRODUCT | |
147 template <class Chunk> | |
148 void AdaptiveFreeList<Chunk>::verify_stats() const { | |
149 // The +1 of the LH comparand is to allow some "looseness" in | |
150 // checking: we usually call this interface when adding a block | |
151 // and we'll subsequently update the stats; we cannot update the | |
152 // stats beforehand because in the case of the large-block BT | |
153 // dictionary for example, this might be the first block and | |
154 // in that case there would be no place that we could record | |
155 // the stats (which are kept in the block itself). | |
156 assert((_allocation_stats.prev_sweep() + _allocation_stats.split_births() | |
157 + _allocation_stats.coal_births() + 1) // Total Production Stock + 1 | |
158 >= (_allocation_stats.split_deaths() + _allocation_stats.coal_deaths() | |
159 + (ssize_t)count()), // Total Current Stock + depletion | |
160 err_msg("FreeList " PTR_FORMAT " of size " SIZE_FORMAT | |
161 " violates Conservation Principle: " | |
162 "prev_sweep(" SIZE_FORMAT ")" | |
163 " + split_births(" SIZE_FORMAT ")" | |
164 " + coal_births(" SIZE_FORMAT ") + 1 >= " | |
165 " split_deaths(" SIZE_FORMAT ")" | |
166 " coal_deaths(" SIZE_FORMAT ")" | |
167 " + count(" SSIZE_FORMAT ")", | |
168 this, size(), _allocation_stats.prev_sweep(), _allocation_stats.split_births(), | |
169 _allocation_stats.split_births(), _allocation_stats.split_deaths(), | |
170 _allocation_stats.coal_deaths(), count())); | |
171 } | |
172 #endif | |
173 | |
174 // Needs to be after the definitions have been seen. | |
175 template class AdaptiveFreeList<FreeChunk>; |