f110b23b7d
'kern.cp_time'. For a live kernel it uses the sysctl. For a crashdump, it first checks to see if the kernel has a 'cp_time' global symbol. If it does, it uses that. If that doesn't work, when it uses the recently added kvm_getmaxcpu(3) and kvm_getpcpu(3) routines to walk all the CPUs and sum up their counters. MFC after: 1 week
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/*-
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* Copyright (c) 2008 Yahoo!, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/pcpu.h>
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#include <sys/resource.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdlib.h>
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#include "kvm_private.h"
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static struct nlist kvm_cp_time_nl[] = {
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{ "_cp_time" }, /* (deprecated) */
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{ NULL },
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};
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#define NL_CP_TIME 0
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static int kvm_cp_time_cached;
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static int
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_kvm_cp_time_init(kvm_t *kd)
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{
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if (kvm_nlist(kd, kvm_cp_time_nl) < 0)
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return (-1);
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kvm_cp_time_cached = 1;
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}
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static int
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getsysctl(kvm_t *kd, const char *name, void *buf, size_t len)
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{
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size_t nlen;
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nlen = len;
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if (sysctlbyname(name, buf, &nlen, NULL, 0) < 0) {
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_kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
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strerror(errno));
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return (-1);
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}
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if (nlen != len) {
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_kvm_err(kd, kd->program, "sysctl %s has unexpected size",
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name);
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return (-1);
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}
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return (0);
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}
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int
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kvm_getcptime(kvm_t *kd, long *cp_time)
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{
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struct pcpu *pc;
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int i, j, maxcpu;
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if (kd == NULL) {
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kvm_cp_time_cached = 0;
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return (0);
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}
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if (ISALIVE(kd))
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return (getsysctl(kd, "kern.cp_time", cp_time, sizeof(long) *
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CPUSTATES));
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if (kvm_cp_time_cached == 0) {
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if (_kvm_cp_time_init(kd) < 0)
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return (-1);
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}
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/* If this kernel has a "cp_time[]" symbol, then just read that. */
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if (kvm_cp_time_nl[NL_CP_TIME].n_value != 0) {
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if (kvm_read(kd, kvm_cp_time_nl[NL_CP_TIME].n_value, cp_time,
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sizeof(long) * CPUSTATES) != sizeof(long) * CPUSTATES) {
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_kvm_err(kd, kd->program, "cannot read cp_time array");
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return (-1);
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}
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return (0);
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}
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/*
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* If we don't have that symbol, then we have to simulate
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* "cp_time[]" by adding up the individual times for each CPU.
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*/
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maxcpu = kvm_getmaxcpu(kd);
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if (maxcpu < 0)
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return (-1);
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for (i = 0; i < CPUSTATES; i++)
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cp_time[i] = 0;
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for (i = 0; i < maxcpu; i++) {
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pc = kvm_getpcpu(kd, i);
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if (pc == NULL)
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continue;
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if (pc == (void *)-1)
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return (-1);
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for (j = 0; j < CPUSTATES; j++)
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cp_time[j] += pc->pc_cp_time[j];
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free(pc);
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}
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return (0);
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}
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