1 /*
2 * Copyright (c) 2022, Amazon.com, Inc. or its affiliates. All rights reserved.
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHCARDSTATS_HPP
27 #define SHARE_GC_SHENANDOAH_SHENANDOAHCARDSTATS_HPP
28
29 #include "gc/shared/gc_globals.hpp"
30 #include "gc/shenandoah/shenandoahNumberSeq.hpp"
31
32 enum CardStatType {
33 DIRTY_RUN = 0,
34 CLEAN_RUN = 1,
35 DIRTY_CARDS = 2,
36 CLEAN_CARDS = 3,
37 MAX_DIRTY_RUN = 4,
38 MAX_CLEAN_RUN = 5,
39 DIRTY_SCAN_OBJS = 6,
40 ALTERNATIONS = 7,
41 MAX_CARD_STAT_TYPE = 8
42 };
43
44 enum CardStatLogType {
45 CARD_STAT_SCAN_RS = 0,
46 CARD_STAT_UPDATE_REFS = 1,
47 MAX_CARD_STAT_LOG_TYPE = 2
48 };
49
50 class ShenandoahCardStats: public CHeapObj<mtGC> {
51 private:
52 size_t _cards_in_cluster;
53 HdrSeq* _local_card_stats;
54
55 size_t _dirty_card_cnt;
56 size_t _clean_card_cnt;
57
58 size_t _dirty_run;
59 size_t _clean_run;
60
61 size_t _max_dirty_run;
62 size_t _max_clean_run;
63
64 size_t _dirty_scan_obj_cnt;
65
66 size_t _alternation_cnt;
67
68 public:
69 ShenandoahCardStats(size_t cards_in_cluster, HdrSeq* card_stats) :
70 _cards_in_cluster(cards_in_cluster),
71 _local_card_stats(card_stats),
72 _dirty_card_cnt(0),
73 _clean_card_cnt(0),
74 _max_dirty_run(0),
75 _max_clean_run(0),
76 _dirty_scan_obj_cnt(0),
77 _alternation_cnt(0)
78 { }
79
80 ~ShenandoahCardStats() {
81 record();
82 }
83
84 void record() {
85 if (ShenandoahEnableCardStats) {
86 // Update global stats for distribution of dirty/clean cards as a percentage of chunk
87 _local_card_stats[DIRTY_CARDS].add((double)_dirty_card_cnt*100/(double)_cards_in_cluster);
88 _local_card_stats[CLEAN_CARDS].add((double)_clean_card_cnt*100/(double)_cards_in_cluster);
89
90 // Update global stats for max dirty/clean run distribution as a percentage of chunk
91 _local_card_stats[MAX_DIRTY_RUN].add((double)_max_dirty_run*100/(double)_cards_in_cluster);
92 _local_card_stats[MAX_CLEAN_RUN].add((double)_max_clean_run*100/(double)_cards_in_cluster);
93
94 // Update global stats for dirty obj scan counts
95 _local_card_stats[DIRTY_SCAN_OBJS].add(_dirty_scan_obj_cnt);
96
97 // Update global stats for alternation counts
98 _local_card_stats[ALTERNATIONS].add(_alternation_cnt);
99 }
100 }
101
102 public:
103 inline void record_dirty_run(size_t len) {
104 if (ShenandoahEnableCardStats) {
105 _alternation_cnt++;
106 if (len > _max_dirty_run) {
107 _max_dirty_run = len;
108 }
109 _dirty_card_cnt += len;
110 assert(len <= _cards_in_cluster, "Error");
111 _local_card_stats[DIRTY_RUN].add((double)len*100.0/(double)_cards_in_cluster);
112 }
113 }
114
115 inline void record_clean_run(size_t len) {
116 if (ShenandoahEnableCardStats) {
117 _alternation_cnt++;
118 if (len > _max_clean_run) {
119 _max_clean_run = len;
120 }
121 _clean_card_cnt += len;
122 assert(len <= _cards_in_cluster, "Error");
123 _local_card_stats[CLEAN_RUN].add((double)len*100.0/(double)_cards_in_cluster);
124 }
125 }
126
127 inline void record_scan_obj_cnt(size_t i) {
128 if (ShenandoahEnableCardStats) {
129 _dirty_scan_obj_cnt += i;
130 }
131 }
132
133 void log() const PRODUCT_RETURN;
134 };
135
136 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCARDSTATS_HPP