| /* |
| * CDDL HEADER START |
| * |
| * This file and its contents are supplied under the terms of the |
| * Common Development and Distribution License ("CDDL"), version 1.0. |
| * You may only use this file in accordance with the terms of version |
| * 1.0 of the CDDL. |
| * |
| * A full copy of the text of the CDDL should have accompanied this |
| * source. A copy of the CDDL is also available via the Internet at |
| * http://www.illumos.org/license/CDDL. |
| * |
| * CDDL HEADER END |
| */ |
| |
| /* |
| * wmsum counters are a reduced version of aggsum counters, optimized for |
| * write-mostly scenarios. They do not provide optimized read functions, |
| * but instead allow much cheaper add function. The primary usage is |
| * infrequently read statistic counters, not requiring exact precision. |
| * |
| * The Linux implementation is directly mapped into percpu_counter KPI. |
| */ |
| |
| #ifndef _SYS_WMSUM_H |
| #define _SYS_WMSUM_H |
| |
| #include <linux/percpu_counter.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| typedef struct percpu_counter wmsum_t; |
| |
| static inline void |
| wmsum_init(wmsum_t *ws, uint64_t value) |
| { |
| |
| #ifdef HAVE_PERCPU_COUNTER_INIT_WITH_GFP |
| percpu_counter_init(ws, value, GFP_KERNEL); |
| #else |
| percpu_counter_init(ws, value); |
| #endif |
| } |
| |
| static inline void |
| wmsum_fini(wmsum_t *ws) |
| { |
| |
| percpu_counter_destroy(ws); |
| } |
| |
| static inline uint64_t |
| wmsum_value(wmsum_t *ws) |
| { |
| |
| return (percpu_counter_sum(ws)); |
| } |
| |
| static inline void |
| wmsum_add(wmsum_t *ws, int64_t delta) |
| { |
| |
| #ifdef HAVE_PERCPU_COUNTER_ADD_BATCH |
| percpu_counter_add_batch(ws, delta, INT_MAX / 2); |
| #else |
| __percpu_counter_add(ws, delta, INT_MAX / 2); |
| #endif |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _SYS_WMSUM_H */ |
