Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/ageTable.hpp @ 1840:4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
Summary: Clear the concurrent marking "in progress" flag while the FullGCCount_lock is held. This avoids a race that can cause back to back System.gc() calls, when ExplicitGCInvokesConcurrent is enabled, to fail to initiate a marking cycle causing the requesting thread to hang.
Reviewed-by: tonyp, ysr
author | johnc |
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date | Fri, 01 Oct 2010 18:23:16 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 */ | |
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25 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University. |
0 | 26 See the LICENSE file for license information. */ |
27 | |
28 // Age table for adaptive feedback-mediated tenuring (scavenging) | |
29 // | |
30 // Note: all sizes are in oops | |
31 | |
32 class ageTable VALUE_OBJ_CLASS_SPEC { | |
33 friend class VMStructs; | |
34 | |
35 public: | |
36 // constants | |
37 enum { table_size = markOopDesc::max_age + 1 }; | |
38 | |
39 // instance variables | |
40 size_t sizes[table_size]; | |
41 | |
42 // constructor. "global" indicates that this is the global age table | |
43 // (as opposed to gc-thread-local) | |
44 ageTable(bool global = true); | |
45 | |
46 // clear table | |
47 void clear(); | |
48 | |
49 // add entry | |
50 void add(oop p, size_t oop_size) { | |
51 int age = p->age(); | |
52 assert(age > 0 && age < table_size, "invalid age of object"); | |
53 sizes[age] += oop_size; | |
54 } | |
55 | |
56 // Merge another age table with the current one. Used | |
57 // for parallel young generation gc. | |
58 void merge(ageTable* subTable); | |
545 | 59 void merge_par(ageTable* subTable); |
0 | 60 |
61 // calculate new tenuring threshold based on age information | |
62 int compute_tenuring_threshold(size_t survivor_capacity); | |
63 | |
64 private: | |
65 PerfVariable* _perf_sizes[table_size]; | |
66 }; |