2 * Copyright (c) 2008 Yahoo!, Inc.
4 * Written by: John Baldwin <jhb@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the names of any co-contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
36 #include <sys/resource.h>
37 #include <sys/sysctl.h>
44 #include "kvm_private.h"
46 static struct nlist kvm_cp_time_nl[] = {
47 { .n_name = "_cp_time" }, /* (deprecated) */
53 static int kvm_cp_time_cached;
56 _kvm_cp_time_init(kvm_t *kd)
59 if (kvm_nlist(kd, kvm_cp_time_nl) < 0)
61 kvm_cp_time_cached = 1;
66 getsysctl(kvm_t *kd, const char *name, void *buf, size_t len)
71 if (sysctlbyname(name, buf, &nlen, NULL, 0) < 0) {
72 _kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
77 _kvm_err(kd, kd->program, "sysctl %s has unexpected size",
85 kvm_getcptime(kvm_t *kd, long *cp_time)
91 kvm_cp_time_cached = 0;
96 return (getsysctl(kd, "kern.cp_time", cp_time, sizeof(long) *
99 if (kvm_cp_time_cached == 0) {
100 if (_kvm_cp_time_init(kd) < 0)
104 /* If this kernel has a "cp_time[]" symbol, then just read that. */
105 if (kvm_cp_time_nl[NL_CP_TIME].n_value != 0) {
106 if (kvm_read(kd, kvm_cp_time_nl[NL_CP_TIME].n_value, cp_time,
107 sizeof(long) * CPUSTATES) != sizeof(long) * CPUSTATES) {
108 _kvm_err(kd, kd->program, "cannot read cp_time array");
115 * If we don't have that symbol, then we have to simulate
116 * "cp_time[]" by adding up the individual times for each CPU.
118 maxcpu = kvm_getmaxcpu(kd);
121 for (i = 0; i < CPUSTATES; i++)
123 for (i = 0; i < maxcpu; i++) {
124 pc = kvm_getpcpu(kd, i);
127 if (pc == (void *)-1)
129 for (j = 0; j < CPUSTATES; j++)
130 cp_time[j] += pc->pc_cp_time[j];