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