Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/asParNewGeneration.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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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 Generation that does parallel young-gen collection extended | |
26 // for adaptive size policy. | |
27 | |
28 // Division of generation into spaces | |
29 // done by DefNewGeneration::compute_space_boundaries() | |
30 // +---------------+ | |
31 // | uncommitted | | |
32 // |---------------| | |
33 // | ss0 | | |
34 // |---------------| | |
35 // | ss1 | | |
36 // |---------------| | |
37 // | | | |
38 // | eden | | |
39 // | | | |
40 // +---------------+ <-- low end of VirtualSpace | |
41 // | |
42 class ASParNewGeneration: public ParNewGeneration { | |
43 | |
44 size_t _min_gen_size; | |
45 | |
46 // Resize the generation based on the desired sizes of | |
47 // the constituent spaces. | |
48 bool resize_generation(size_t eden_size, size_t survivor_size); | |
49 // Resize the spaces based on their desired sizes but | |
50 // respecting the maximum size of the generation. | |
51 void resize_spaces(size_t eden_size, size_t survivor_size); | |
52 // Return the byte size remaining to the minimum generation size. | |
53 size_t available_to_min_gen(); | |
54 // Return the byte size remaining to the live data in the generation. | |
55 size_t available_to_live() const; | |
56 // Return the byte size that the generation is allowed to shrink. | |
57 size_t limit_gen_shrink(size_t bytes); | |
58 // Reset the size of the spaces after a shrink of the generation. | |
59 void reset_survivors_after_shrink(); | |
60 | |
61 // Accessor | |
62 VirtualSpace* virtual_space() { return &_virtual_space; } | |
63 | |
64 virtual void adjust_desired_tenuring_threshold(); | |
65 | |
66 public: | |
67 | |
68 ASParNewGeneration(ReservedSpace rs, | |
69 size_t initial_byte_size, | |
70 size_t min_byte_size, | |
71 int level); | |
72 | |
73 virtual const char* short_name() const { return "ASParNew"; } | |
74 virtual const char* name() const; | |
75 virtual Generation::Name kind() { return ASParNew; } | |
76 | |
77 // Change the sizes of eden and the survivor spaces in | |
78 // the generation. The parameters are desired sizes | |
79 // and are not guaranteed to be met. For example, if | |
80 // the total is larger than the generation. | |
81 void resize(size_t eden_size, size_t survivor_size); | |
82 | |
83 virtual void compute_new_size(); | |
84 | |
85 size_t max_gen_size() { return _reserved.byte_size(); } | |
86 size_t min_gen_size() const { return _min_gen_size; } | |
87 | |
88 // Space boundary invariant checker | |
89 void space_invariants() PRODUCT_RETURN; | |
90 }; |