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 37 wmsum_init(wmsum_t *ws, uint64_t value) 38 { 39 40 aggsum_init(ws, value); 41 } 42 43 static inline void 44 wmsum_fini(wmsum_t *ws) 45 { 46 47 aggsum_fini(ws); 48 } 49 50 static inline uint64_t 51 wmsum_value(wmsum_t *ws) 52 { 53 54 return (aggsum_value(ws)); 55 } 56 57 static inline void 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