Thu, 20 Sep 2012 09:52:56 -0700
7190666: G1: assert(_unused == 0) failed: Inconsistency in PLAB stats
Summary: Reset the fields in ParGCAllocBuffer, that are used for accumulating values for the ResizePLAB sensors in PLABStats, to zero after flushing the values to the PLABStats fields. Flush PLABStats values only when retiring the final allocation buffers prior to disposing of a G1ParScanThreadState object, rather than when retiring every allocation buffer.
Reviewed-by: jwilhelm, jmasa, ysr
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP
28 #include "memory/iterator.hpp"
30 // An ImmutableSpace is a viewport into a contiguous range
31 // (or subrange) of previously allocated objects.
33 // Invariant: bottom() and end() are on page_size boundaries and
34 // bottom() <= end()
36 class ImmutableSpace: public CHeapObj<mtGC> {
37 friend class VMStructs;
38 protected:
39 HeapWord* _bottom;
40 HeapWord* _end;
42 public:
43 ImmutableSpace() { _bottom = NULL; _end = NULL; }
44 HeapWord* bottom() const { return _bottom; }
45 HeapWord* end() const { return _end; }
47 MemRegion region() const { return MemRegion(bottom(), end()); }
49 // Initialization
50 void initialize(MemRegion mr);
52 bool contains(const void* p) const { return _bottom <= p && p < _end; }
54 // Size computations. Sizes are in bytes.
55 size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; }
57 // Size computations. Sizes are in heapwords.
58 size_t capacity_in_words() const { return pointer_delta(end(), bottom()); }
59 virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); }
61 // Iteration.
62 virtual void oop_iterate(ExtendedOopClosure* cl);
63 virtual void object_iterate(ObjectClosure* cl);
65 // Debugging
66 virtual void print() const PRODUCT_RETURN;
67 virtual void print_short() const PRODUCT_RETURN;
68 virtual void verify();
69 };
71 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP