1 /*
2 * CDDL HEADER START
3 *
4 * This file and its contents are supplied under the terms of the
5 * Common Development and Distribution License ("CDDL"), version 1.0.
6 * You may only use this file in accordance with the terms of version
7 * 1.0 of the CDDL.
8 *
9 * A full copy of the text of the CDDL should have accompanied this
10 * source. A copy of the CDDL is also available via the Internet at
11 * http://www.illumos.org/license/CDDL.
12 *
13 * CDDL HEADER END
14 */
15
16 /*
17 * wmsum counters are a reduced version of aggsum counters, optimized for
18 * write-mostly scenarios. They do not provide optimized read functions,
19 * but instead allow much cheaper add function. The primary usage is
20 * infrequently read statistic counters, not requiring exact precision.
21 *
22 * In user-space due to lack of better implementation mapped to aggsum.
23 */
24
25 #ifndef _SYS_WMSUM_H
26 #define _SYS_WMSUM_H
27
28 #include <sys/aggsum.h>
29
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33
34 #define wmsum_t aggsum_t
35
36 static inline void
wmsum_init(wmsum_t * ws,uint64_t value)37 wmsum_init(wmsum_t *ws, uint64_t value)
38 {
39
40 aggsum_init(ws, value);
41 }
42
43 static inline void
wmsum_fini(wmsum_t * ws)44 wmsum_fini(wmsum_t *ws)
45 {
46
47 aggsum_fini(ws);
48 }
49
50 static inline uint64_t
wmsum_value(wmsum_t * ws)51 wmsum_value(wmsum_t *ws)
52 {
53
54 return (aggsum_value(ws));
55 }
56
57 static inline void
wmsum_add(wmsum_t * ws,int64_t delta)58 wmsum_add(wmsum_t *ws, int64_t delta)
59 {
60
61 aggsum_add(ws, delta);
62 }
63
64 #ifdef __cplusplus
65 }
66 #endif
67
68 #endif /* _SYS_WMSUM_H */
69