1/* $OpenBSD: evcount.h,v 1.4 2022/11/10 07:05:41 jmatthew Exp $ */
2/*
3 * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
4 * Copyright (c) 2004 Aaron Campbell <aaron@openbsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef __SYS_EVCOUNT_H__
29#define __SYS_EVCOUNT_H__
30
31#ifdef _KERNEL
32
33#include <sys/queue.h>
34
35struct cpumem;
36
37struct evcount {
38 u_int64_t ec_count; /* main counter */
39 int ec_id; /* counter ID */
40 const char *ec_name; /* counter name */
41 void *ec_data; /* user data */
42 struct cpumem *ec_percpu; /* per-cpu counter */
43
44 TAILQ_ENTRY(evcount) next;
45};
46
47void evcount_attach(struct evcount *, const char *, void *);
48void evcount_detach(struct evcount *);
49void evcount_inc(struct evcount *);
50void evcount_init_percpu(void);
51void evcount_percpu(struct evcount *);
52int evcount_sysctl(int *, u_int, void *, size_t *, void *, size_t);
53
54#endif /* _KERNEL */
55
56#endif