Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/gSpaceCounters.hpp @ 1951:899bbbdcb6ea
6997298: fatal error: must own lock CMS_markBitMap_lock during heap dump
Summary: Since we are at a stop-world pause, the existing CMS-phase checks are sufficient for safety, and the locking check can be safely elided. Elaborated documentation comment to the case where class unloading and verification are disabled, and the query happens when we aren't in the sweeping phase, where the answer "false" would be (almost everywhere) too pessimistic.
Reviewed-by: jmasa, johnc, tonyp
author | ysr |
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date | Fri, 05 Nov 2010 13:20:37 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2004, Oracle and/or its affiliates. All rights reserved. |
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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 | |
25 // A GSpaceCounter is a holder class for performance counters | |
26 // that track a space; | |
27 | |
28 class GSpaceCounters: public CHeapObj { | |
29 friend class VMStructs; | |
30 | |
31 private: | |
32 PerfVariable* _capacity; | |
33 PerfVariable* _used; | |
34 | |
35 // Constant PerfData types don't need to retain a reference. | |
36 // However, it's a good idea to document them here. | |
37 // PerfConstant* _size; | |
38 | |
39 Generation* _gen; | |
40 char* _name_space; | |
41 | |
42 public: | |
43 | |
44 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, | |
45 GenerationCounters* gc, bool sampled=true); | |
46 | |
47 ~GSpaceCounters() { | |
48 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); | |
49 } | |
50 | |
51 inline void update_capacity() { | |
52 _capacity->set_value(_gen->capacity()); | |
53 } | |
54 | |
55 inline void update_used() { | |
56 _used->set_value(_gen->used()); | |
57 } | |
58 | |
59 // special version of update_used() to allow the used value to be | |
60 // passed as a parameter. This method can can be used in cases were | |
61 // the utilization is already known and/or when the _gen->used() | |
62 // method is known to be expensive and we want to avoid unnecessary | |
63 // calls to it. | |
64 // | |
65 inline void update_used(size_t used) { | |
66 _used->set_value(used); | |
67 } | |
68 | |
69 inline void inc_used(size_t size) { | |
70 _used->inc(size); | |
71 } | |
72 | |
73 debug_only( | |
74 // for security reasons, we do not allow arbitrary reads from | |
75 // the counters as they may live in shared memory. | |
76 jlong used() { | |
77 return _used->get_value(); | |
78 } | |
79 jlong capacity() { | |
80 return _used->get_value(); | |
81 } | |
82 ) | |
83 | |
84 inline void update_all() { | |
85 update_used(); | |
86 update_capacity(); | |
87 } | |
88 | |
89 const char* name_space() const { return _name_space; } | |
90 }; | |
91 | |
92 class GenerationUsedHelper : public PerfLongSampleHelper { | |
93 private: | |
94 Generation* _gen; | |
95 | |
96 public: | |
97 GenerationUsedHelper(Generation* g) : _gen(g) { } | |
98 | |
99 inline jlong take_sample() { | |
100 return _gen->used(); | |
101 } | |
102 }; |