Thu, 21 Aug 2014 16:44:41 +0200
8055098: WB API should be extended to provide information about size and age of object.
Summary: Extend the WhiteBox API to provide information about the size and age of objects. Further add a mechanism to trigger a young GC.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP
28 #include "gc_implementation/g1/g1RemSet.hpp"
29 #include "gc_implementation/g1/heapRegion.hpp"
30 #include "gc_implementation/g1/heapRegionRemSet.hpp"
31 #include "oops/oop.inline.hpp"
33 inline uint G1RemSet::n_workers() {
34 if (_g1->workers() != NULL) {
35 return _g1->workers()->total_workers();
36 } else {
37 return 1;
38 }
39 }
41 template <class T>
42 inline void G1RemSet::write_ref(HeapRegion* from, T* p) {
43 par_write_ref(from, p, 0);
44 }
46 template <class T>
47 inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {
48 oop obj = oopDesc::load_decode_heap_oop(p);
49 if (obj == NULL) {
50 return;
51 }
53 #ifdef ASSERT
54 // can't do because of races
55 // assert(obj == NULL || obj->is_oop(), "expected an oop");
57 // Do the safe subset of is_oop
58 #ifdef CHECK_UNHANDLED_OOPS
59 oopDesc* o = obj.obj();
60 #else
61 oopDesc* o = obj;
62 #endif // CHECK_UNHANDLED_OOPS
63 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
64 assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
65 #endif // ASSERT
67 assert(from == NULL || from->is_in_reserved(p), "p is not in from");
69 HeapRegion* to = _g1->heap_region_containing(obj);
70 if (from != to) {
71 assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
72 to->rem_set()->add_reference(p, tid);
73 }
74 }
76 template <class T>
77 inline void UpdateRSOopClosure::do_oop_work(T* p) {
78 assert(_from != NULL, "from region must be non-NULL");
79 _rs->par_write_ref(_from, p, _worker_i);
80 }
82 template <class T>
83 inline void UpdateRSetImmediate::do_oop_work(T* p) {
84 assert(_from->is_in_reserved(p), "paranoia");
85 T heap_oop = oopDesc::load_heap_oop(p);
86 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
87 _g1_rem_set->par_write_ref(_from, p, 0);
88 }
89 }
91 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP