Mercurial > hg > graal-compiler
annotate src/share/vm/memory/watermark.hpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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6941466: Oracle rebranding changes for Hotspot repositories
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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 */ | |
24 | |
25 // A water mark points into a space and is used during GC to keep track of | |
26 // progress. | |
27 | |
28 class Space; | |
29 | |
30 class WaterMark VALUE_OBJ_CLASS_SPEC { | |
31 friend class VMStructs; | |
32 private: | |
33 HeapWord* _point; | |
34 Space* _space; | |
35 public: | |
36 // Accessors | |
37 Space* space() const { return _space; } | |
38 void set_space(Space* s) { _space = s; } | |
39 HeapWord* point() const { return _point; } | |
40 void set_point(HeapWord* p) { _point = p; } | |
41 | |
42 // Constructors | |
43 WaterMark(Space* s, HeapWord* p) : _space(s), _point(p) {}; | |
44 WaterMark() : _space(NULL), _point(NULL) {}; | |
45 }; | |
46 | |
47 inline bool operator==(const WaterMark& x, const WaterMark& y) { | |
48 return (x.point() == y.point()) && (x.space() == y.space()); | |
49 } | |
50 | |
51 inline bool operator!=(const WaterMark& x, const WaterMark& y) { | |
52 return !(x == y); | |
53 } |