g1EvacStats.hpp revision 8867:8e371a1ba7df 
1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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#include "runtime/atomic.hpp"
30
31// Records various memory allocation statistics gathered during evacuation.
32class G1EvacStats : public PLABStats {
33 private:
34  size_t _region_end_waste; // Number of words wasted due to skipping to the next region.
35  uint   _regions_filled;   // Number of regions filled completely.
36  size_t _direct_allocated; // Number of words allocated directly into the regions.
37
38  // Number of words in live objects remaining in regions that ultimately suffered an
39  // evacuation failure. This is used in the regions when the regions are made old regions.
40  size_t _failure_used;
41  // Number of words wasted in regions which failed evacuation. This is the sum of space
42  // for objects successfully copied out of the regions (now dead space) plus waste at the
43  // end of regions.
44  size_t _failure_waste;
45
46  virtual void reset() {
47    PLABStats::reset();
48    _region_end_waste = 0;
49    _regions_filled = 0;
50    _direct_allocated = 0;
51    _failure_used = 0;
52    _failure_waste = 0;
53  }
54
55 public:
56  G1EvacStats(size_t desired_plab_sz_, unsigned wt) : PLABStats(desired_plab_sz_, wt),
57    _region_end_waste(0), _regions_filled(0), _direct_allocated(0),
58    _failure_used(0), _failure_waste(0) {
59  }
60
61  virtual void adjust_desired_plab_sz();
62
63  size_t allocated() const { return _allocated; }
64  size_t wasted() const { return _wasted; }
65  size_t unused() const { return _unused; }
66  size_t used() const { return allocated() - (wasted() + unused()); }
67  size_t undo_wasted() const { return _undo_wasted; }
68
69  uint regions_filled() const { return _regions_filled; }
70  size_t region_end_waste() const { return _region_end_waste; }
71  size_t direct_allocated() const { return _direct_allocated; }
72
73  // Amount of space in heapwords used in the failing regions when an evacuation failure happens.
74  size_t failure_used() const { return _failure_used; }
75  // Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.
76  size_t failure_waste() const { return _failure_waste; }
77
78  void add_direct_allocated(size_t value) {
79    Atomic::add_ptr(value, &_direct_allocated);
80  }
81
82  void add_region_end_waste(size_t value) {
83    Atomic::add_ptr(value, &_region_end_waste);
84    Atomic::add_ptr(1, &_regions_filled);
85  }
86
87  void add_failure_used_and_waste(size_t used, size_t waste) {
88    Atomic::add_ptr(used, &_failure_used);
89    Atomic::add_ptr(waste, &_failure_waste);
90  }
91};
92
93#endif // SHARE_VM_gc_G1_G1EVACSTATS_HPP
94