1 /*
2 * Copyright (c) 2018, 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 #include "precompiled.hpp"
26 #include "gc/g1/g1RegionMarkStatsCache.inline.hpp"
27 #include "memory/allocation.inline.hpp"
28
G1RegionMarkStatsCache(G1RegionMarkStats * target,uint max_regions,uint num_cache_entries)29 G1RegionMarkStatsCache::G1RegionMarkStatsCache(G1RegionMarkStats* target, uint max_regions, uint num_cache_entries) :
30 _target(target),
31 _num_stats(max_regions),
32 _cache(NULL),
33 _num_cache_entries(num_cache_entries),
34 _cache_hits(0),
35 _cache_misses(0),
36 _num_cache_entries_mask(_num_cache_entries - 1) {
37
38 guarantee(is_power_of_2(num_cache_entries),
39 "Number of cache entries must be power of two, but is %u", num_cache_entries);
40 _cache = NEW_C_HEAP_ARRAY(G1RegionMarkStatsCacheEntry, _num_cache_entries, mtGC);
41 }
42
~G1RegionMarkStatsCache()43 G1RegionMarkStatsCache::~G1RegionMarkStatsCache() {
44 FREE_C_HEAP_ARRAY(G1RegionMarkStatsCacheEntry, _cache);
45 }
46
47 // Evict all remaining statistics, returning cache hits and misses.
evict_all()48 Pair<size_t, size_t> G1RegionMarkStatsCache::evict_all() {
49 for (uint i = 0; i < _num_cache_entries; i++) {
50 evict(i);
51 }
52 return Pair<size_t,size_t>(_cache_hits, _cache_misses);
53 }
54
55 // Reset all cache entries to their default values.
reset()56 void G1RegionMarkStatsCache::reset() {
57 _cache_hits = 0;
58 _cache_misses = 0;
59
60 for (uint i = 0; i < _num_cache_entries; i++) {
61 _cache[i].clear();
62 }
63 }
64