1/*
2 * Copyright (c) 2015, 2019, 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_GC_G1_G1EVACSTATS_HPP
26#define SHARE_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 virtual void log_plab_allocation();
55
56 virtual size_t compute_desired_plab_sz();
57
58 public:
59 G1EvacStats(const char* description, size_t desired_plab_sz_, unsigned wt);
60
61 ~G1EvacStats();
62
63 uint regions_filled() const { return _regions_filled; }
64 size_t region_end_waste() const { return _region_end_waste; }
65 size_t direct_allocated() const { return _direct_allocated; }
66
67 // Amount of space in heapwords used in the failing regions when an evacuation failure happens.
68 size_t failure_used() const { return _failure_used; }
69 // Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.
70 size_t failure_waste() const { return _failure_waste; }
71
72 inline void add_direct_allocated(size_t value);
73 inline void add_region_end_waste(size_t value);
74 inline void add_failure_used_and_waste(size_t used, size_t waste);
75};
76
77#endif // SHARE_GC_G1_G1EVACSTATS_HPP
78