kvm_cptime.c revision 194186
1181880Sjhb/*- 2181880Sjhb * Copyright (c) 2008 Yahoo!, Inc. 3181880Sjhb * All rights reserved. 4181880Sjhb * Written by: John Baldwin <jhb@FreeBSD.org> 5181880Sjhb * 6181880Sjhb * Redistribution and use in source and binary forms, with or without 7181880Sjhb * modification, are permitted provided that the following conditions 8181880Sjhb * are met: 9181880Sjhb * 1. Redistributions of source code must retain the above copyright 10181880Sjhb * notice, this list of conditions and the following disclaimer. 11181880Sjhb * 2. Redistributions in binary form must reproduce the above copyright 12181880Sjhb * notice, this list of conditions and the following disclaimer in the 13181880Sjhb * documentation and/or other materials provided with the distribution. 14181880Sjhb * 3. Neither the name of the author nor the names of any co-contributors 15181880Sjhb * may be used to endorse or promote products derived from this software 16181880Sjhb * without specific prior written permission. 17181880Sjhb * 18181880Sjhb * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19181880Sjhb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20181880Sjhb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21181880Sjhb * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22181880Sjhb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23181880Sjhb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24181880Sjhb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25181880Sjhb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26181880Sjhb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27181880Sjhb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28181880Sjhb * SUCH DAMAGE. 29181880Sjhb */ 30181880Sjhb 31181880Sjhb#include <sys/cdefs.h> 32181880Sjhb__FBSDID("$FreeBSD: head/lib/libkvm/kvm_cptime.c 194186 2009-06-14 12:42:06Z ed $"); 33181880Sjhb 34181880Sjhb#include <sys/param.h> 35181880Sjhb#include <sys/pcpu.h> 36181880Sjhb#include <sys/resource.h> 37181880Sjhb#include <sys/sysctl.h> 38181880Sjhb#include <errno.h> 39181880Sjhb#include <kvm.h> 40181880Sjhb#include <limits.h> 41181880Sjhb#include <stdlib.h> 42194186Sed#include <string.h> 43181880Sjhb 44181880Sjhb#include "kvm_private.h" 45181880Sjhb 46181880Sjhbstatic struct nlist kvm_cp_time_nl[] = { 47181880Sjhb { "_cp_time" }, /* (deprecated) */ 48181880Sjhb { NULL }, 49181880Sjhb}; 50181880Sjhb 51181880Sjhb#define NL_CP_TIME 0 52181880Sjhb 53181880Sjhbstatic int kvm_cp_time_cached; 54181880Sjhb 55181880Sjhbstatic int 56181880Sjhb_kvm_cp_time_init(kvm_t *kd) 57181880Sjhb{ 58181880Sjhb 59181880Sjhb if (kvm_nlist(kd, kvm_cp_time_nl) < 0) 60181880Sjhb return (-1); 61181880Sjhb kvm_cp_time_cached = 1; 62181880Sjhb} 63181880Sjhb 64181880Sjhbstatic int 65181880Sjhbgetsysctl(kvm_t *kd, const char *name, void *buf, size_t len) 66181880Sjhb{ 67181880Sjhb size_t nlen; 68181880Sjhb 69181880Sjhb nlen = len; 70181880Sjhb if (sysctlbyname(name, buf, &nlen, NULL, 0) < 0) { 71181880Sjhb _kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name, 72181880Sjhb strerror(errno)); 73181880Sjhb return (-1); 74181880Sjhb } 75181880Sjhb if (nlen != len) { 76181880Sjhb _kvm_err(kd, kd->program, "sysctl %s has unexpected size", 77181880Sjhb name); 78181880Sjhb return (-1); 79181880Sjhb } 80181880Sjhb return (0); 81181880Sjhb} 82181880Sjhb 83181880Sjhbint 84181880Sjhbkvm_getcptime(kvm_t *kd, long *cp_time) 85181880Sjhb{ 86181880Sjhb struct pcpu *pc; 87181880Sjhb int i, j, maxcpu; 88181880Sjhb 89181880Sjhb if (kd == NULL) { 90181880Sjhb kvm_cp_time_cached = 0; 91181880Sjhb return (0); 92181880Sjhb } 93181880Sjhb 94181880Sjhb if (ISALIVE(kd)) 95181880Sjhb return (getsysctl(kd, "kern.cp_time", cp_time, sizeof(long) * 96181880Sjhb CPUSTATES)); 97181880Sjhb 98181880Sjhb if (kvm_cp_time_cached == 0) { 99181880Sjhb if (_kvm_cp_time_init(kd) < 0) 100181880Sjhb return (-1); 101181880Sjhb } 102181880Sjhb 103181880Sjhb /* If this kernel has a "cp_time[]" symbol, then just read that. */ 104181880Sjhb if (kvm_cp_time_nl[NL_CP_TIME].n_value != 0) { 105181880Sjhb if (kvm_read(kd, kvm_cp_time_nl[NL_CP_TIME].n_value, cp_time, 106181880Sjhb sizeof(long) * CPUSTATES) != sizeof(long) * CPUSTATES) { 107181880Sjhb _kvm_err(kd, kd->program, "cannot read cp_time array"); 108181880Sjhb return (-1); 109181880Sjhb } 110181880Sjhb return (0); 111181880Sjhb } 112181880Sjhb 113181880Sjhb /* 114181880Sjhb * If we don't have that symbol, then we have to simulate 115181880Sjhb * "cp_time[]" by adding up the individual times for each CPU. 116181880Sjhb */ 117181880Sjhb maxcpu = kvm_getmaxcpu(kd); 118181880Sjhb if (maxcpu < 0) 119181880Sjhb return (-1); 120181880Sjhb for (i = 0; i < CPUSTATES; i++) 121181880Sjhb cp_time[i] = 0; 122181880Sjhb for (i = 0; i < maxcpu; i++) { 123181880Sjhb pc = kvm_getpcpu(kd, i); 124181880Sjhb if (pc == NULL) 125181880Sjhb continue; 126181880Sjhb if (pc == (void *)-1) 127181880Sjhb return (-1); 128181880Sjhb for (j = 0; j < CPUSTATES; j++) 129181880Sjhb cp_time[j] += pc->pc_cp_time[j]; 130181880Sjhb free(pc); 131181880Sjhb } 132181880Sjhb return (0); 133181880Sjhb} 134