g1EvacStats.hpp revision 9518:8b225463c1af 
1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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24
25#ifndef SHARE_VM_GC_G1_G1EVACSTATS_HPP
26#define SHARE_VM_GC_G1_G1EVACSTATS_HPP
27
28#include "gc/shared/plab.hpp"
29
30// Records various memory allocation statistics gathered during evacuation.
31class G1EvacStats : public PLABStats {
32 private:
33  size_t _region_end_waste; // Number of words wasted due to skipping to the next region.
34  uint   _regions_filled;   // Number of regions filled completely.
35  size_t _direct_allocated; // Number of words allocated directly into the regions.
36
37  // Number of words in live objects remaining in regions that ultimately suffered an
38  // evacuation failure. This is used in the regions when the regions are made old regions.
39  size_t _failure_used;
40  // Number of words wasted in regions which failed evacuation. This is the sum of space
41  // for objects successfully copied out of the regions (now dead space) plus waste at the
42  // end of regions.
43  size_t _failure_waste;
44
45  virtual void reset() {
46    PLABStats::reset();
47    _region_end_waste = 0;
48    _regions_filled = 0;
49    _direct_allocated = 0;
50    _failure_used = 0;
51    _failure_waste = 0;
52  }
53
54 public:
55  G1EvacStats(size_t desired_plab_sz_, unsigned wt) : PLABStats(desired_plab_sz_, wt),
56    _region_end_waste(0), _regions_filled(0), _direct_allocated(0),
57    _failure_used(0), _failure_waste(0) {
58  }
59
60  virtual void adjust_desired_plab_sz();
61
62  size_t allocated() const { return _allocated; }
63  size_t wasted() const { return _wasted; }
64  size_t unused() const { return _unused; }
65  size_t used() const { return allocated() - (wasted() + unused()); }
66  size_t undo_wasted() const { return _undo_wasted; }
67
68  uint regions_filled() const { return _regions_filled; }
69  size_t region_end_waste() const { return _region_end_waste; }
70  size_t direct_allocated() const { return _direct_allocated; }
71
72  // Amount of space in heapwords used in the failing regions when an evacuation failure happens.
73  size_t failure_used() const { return _failure_used; }
74  // Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.
75  size_t failure_waste() const { return _failure_waste; }
76
77  inline void add_direct_allocated(size_t value);
78  inline void add_region_end_waste(size_t value);
79  inline void add_failure_used_and_waste(size_t used, size_t waste);
80
81  ~G1EvacStats();
82};
83
84#endif // SHARE_VM_GC_G1_G1EVACSTATS_HPP
85