Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiTagMap.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 |
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0 | 1 /* |
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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 |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // JvmtiTagMap | |
26 | |
27 #ifndef _JAVA_JVMTI_TAG_MAP_H_ | |
28 #define _JAVA_JVMTI_TAG_MAP_H_ | |
29 | |
30 // forward references | |
31 class JvmtiTagHashmap; | |
32 class JvmtiTagHashmapEntry; | |
33 class JvmtiTagHashmapEntryClosure; | |
34 | |
35 class JvmtiTagMap : public CHeapObj { | |
36 private: | |
37 | |
38 enum{ | |
39 n_hashmaps = 2, // encapsulates 2 hashmaps | |
40 max_free_entries = 4096 // maximum number of free entries per env | |
41 }; | |
42 | |
43 // memory region for young generation | |
44 static MemRegion _young_gen; | |
45 static void get_young_generation(); | |
46 | |
47 JvmtiEnv* _env; // the jvmti environment | |
48 Mutex _lock; // lock for this tag map | |
49 JvmtiTagHashmap* _hashmap[n_hashmaps]; // the hashmaps | |
50 | |
51 JvmtiTagHashmapEntry* _free_entries; // free list for this environment | |
52 int _free_entries_count; // number of entries on the free list | |
53 | |
54 // create a tag map | |
55 JvmtiTagMap(JvmtiEnv* env); | |
56 | |
57 // accessors | |
58 inline Mutex* lock() { return &_lock; } | |
59 inline JvmtiEnv* env() const { return _env; } | |
60 | |
61 // rehash tags maps for generation start to end | |
62 void rehash(int start, int end); | |
63 | |
64 // indicates if the object is in the young generation | |
65 static bool is_in_young(oop o); | |
66 | |
67 // iterate over all entries in this tag map | |
68 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); | |
69 | |
70 public: | |
71 | |
72 // indicates if this tag map is locked | |
73 bool is_locked() { return lock()->is_locked(); } | |
74 | |
75 // return the appropriate hashmap for a given object | |
76 JvmtiTagHashmap* hashmap_for(oop o); | |
77 | |
78 // create/destroy entries | |
79 JvmtiTagHashmapEntry* create_entry(jweak ref, jlong tag); | |
80 void destroy_entry(JvmtiTagHashmapEntry* entry); | |
81 | |
82 // returns true if the hashmaps are empty | |
83 bool is_empty(); | |
84 | |
85 // return tag for the given environment | |
86 static JvmtiTagMap* tag_map_for(JvmtiEnv* env); | |
87 | |
88 // destroy tag map | |
89 ~JvmtiTagMap(); | |
90 | |
91 // set/get tag | |
92 void set_tag(jobject obj, jlong tag); | |
93 jlong get_tag(jobject obj); | |
94 | |
95 // deprecated heap iteration functions | |
96 void iterate_over_heap(jvmtiHeapObjectFilter object_filter, | |
97 KlassHandle klass, | |
98 jvmtiHeapObjectCallback heap_object_callback, | |
99 const void* user_data); | |
100 | |
101 void iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, | |
102 jvmtiStackReferenceCallback stack_ref_callback, | |
103 jvmtiObjectReferenceCallback object_ref_callback, | |
104 const void* user_data); | |
105 | |
106 void iterate_over_objects_reachable_from_object(jobject object, | |
107 jvmtiObjectReferenceCallback object_reference_callback, | |
108 const void* user_data); | |
109 | |
110 | |
111 // advanced (JVMTI 1.1) heap iteration functions | |
112 void iterate_through_heap(jint heap_filter, | |
113 KlassHandle klass, | |
114 const jvmtiHeapCallbacks* callbacks, | |
115 const void* user_data); | |
116 | |
117 void follow_references(jint heap_filter, | |
118 KlassHandle klass, | |
119 jobject initial_object, | |
120 const jvmtiHeapCallbacks* callbacks, | |
121 const void* user_data); | |
122 | |
123 // get tagged objects | |
124 jvmtiError get_objects_with_tags(const jlong* tags, jint count, | |
125 jint* count_ptr, jobject** object_result_ptr, | |
126 jlong** tag_result_ptr); | |
127 | |
128 // call post-GC to rehash the tag maps. | |
129 static void gc_epilogue(bool full); | |
130 | |
131 // call after referencing processing has completed (CMS) | |
132 static void cms_ref_processing_epilogue(); | |
133 }; | |
134 | |
135 #endif /* _JAVA_JVMTI_TAG_MAP_H_ */ |