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.
32 class 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