2 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/counter.h>
33 #include <sys/kernel.h>
35 #include <sys/sysctl.h>
38 static uma_zone_t uint64_pcpu_zone;
41 counter_u64_zero(counter_u64_t c)
45 for (i = 0; i < mp_ncpus; i++)
46 *(uint64_t *)((char *)c + sizeof(struct pcpu) * i) = 0;
50 counter_u64_fetch(counter_u64_t c)
56 for (i = 0; i < mp_ncpus; i++)
57 r += *(uint64_t *)((char *)c + sizeof(struct pcpu) * i);
63 counter_u64_alloc(int flags)
67 r = uma_zalloc(uint64_pcpu_zone, flags);
75 counter_u64_free(counter_u64_t c)
78 uma_zfree(uint64_pcpu_zone, c);
82 sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS)
87 out = counter_u64_fetch(*(counter_u64_t *)arg1);
89 error = SYSCTL_OUT(req, &out, sizeof(uint64_t));
91 if (error || !req->newptr)
95 * Any write attempt to a counter zeroes it.
97 counter_u64_zero(*(counter_u64_t *)arg1);
103 counter_startup(void)
106 uint64_pcpu_zone = uma_zcreate("uint64 pcpu", sizeof(uint64_t),
107 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_PCPU);
109 SYSINIT(counter, SI_SUB_CPU, SI_ORDER_FOURTH, counter_startup, NULL);