Mercurial > hg > graal-compiler
annotate src/share/vm/oops/instanceRefKlass.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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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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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 // An instanceRefKlass is a specialized instanceKlass for Java | |
26 // classes that are subclasses of java/lang/ref/Reference. | |
27 // | |
28 // These classes are used to implement soft/weak/final/phantom | |
29 // references and finalization, and need special treatment by the | |
30 // garbage collector. | |
31 // | |
32 // During GC discovered reference objects are added (chained) to one | |
33 // of the four lists below, depending on the type of reference. | |
34 // The linked occurs through the next field in class java/lang/ref/Reference. | |
35 // | |
36 // Afterwards, the discovered references are processed in decreasing | |
37 // order of reachability. Reference objects eligible for notification | |
38 // are linked to the static pending_list in class java/lang/ref/Reference, | |
39 // and the pending list lock object in the same class is notified. | |
40 | |
41 | |
42 class instanceRefKlass: public instanceKlass { | |
43 public: | |
44 // Type testing | |
45 bool oop_is_instanceRef() const { return true; } | |
46 | |
47 // Casting from klassOop | |
48 static instanceRefKlass* cast(klassOop k) { | |
49 assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass"); | |
50 return (instanceRefKlass*) k->klass_part(); | |
51 } | |
52 | |
53 // allocation | |
54 DEFINE_ALLOCATE_PERMANENT(instanceRefKlass); | |
55 | |
56 // Garbage collection | |
57 int oop_adjust_pointers(oop obj); | |
58 void oop_follow_contents(oop obj); | |
59 | |
60 // Parallel Scavenge and Parallel Old | |
61 PARALLEL_GC_DECLS | |
62 | |
63 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
64 return oop_oop_iterate_v(obj, blk); | |
65 } | |
66 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
67 return oop_oop_iterate_v_m(obj, blk, mr); | |
68 } | |
69 | |
70 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
71 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ | |
72 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); | |
73 | |
74 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL) | |
342 | 75 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
76 | |
77 #ifndef SERIALGC | |
78 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ | |
79 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); | |
80 | |
81 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) | |
82 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) | |
83 #endif // !SERIALGC | |
0 | 84 |
85 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); | |
86 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); | |
87 | |
88 // Update non-static oop maps so 'referent', 'nextPending' and | |
89 // 'discovered' will look like non-oops | |
90 static void update_nonstatic_oop_maps(klassOop k); | |
91 | |
92 public: | |
93 // Verification | |
94 void oop_verify_on(oop obj, outputStream* st); | |
95 }; |