1 /* 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Joerg Sonnenberger <joerg@bec.de>. 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. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/lib/libkinfo/kinfo_sched.c,v 1.3 2005/04/27 16:16:30 hmp Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/sysctl.h> 39 40 #include <assert.h> 41 #include <stdlib.h> 42 #include <errno.h> 43 #include <kinfo.h> 44 45 int 46 kinfo_get_cpus(int *ncpus) 47 { 48 size_t len = sizeof(*ncpus); 49 50 return(sysctlbyname("hw.ncpu", ncpus, &len, NULL, 0)); 51 } 52 53 int 54 kinfo_get_sched_ccpu(int *ccpu) 55 { 56 size_t len = sizeof(*ccpu); 57 58 return(sysctlbyname("kern.ccpu", ccpu, &len, NULL, 0)); 59 } 60 61 int 62 kinfo_get_sched_cputime(struct kinfo_cputime *cputime) 63 { 64 struct kinfo_cputime *percpu = NULL; 65 size_t len = sizeof(struct kinfo_cputime) * SMP_MAXCPU; 66 int cpucount, error = 0; 67 68 _DIAGASSERT(cputime != NULL); 69 70 if ((percpu = malloc(len)) == NULL) { 71 error = ENOMEM; 72 goto done; 73 } 74 75 /* retrieve verbatim per-cpu statistics from kernel */ 76 if (sysctlbyname("kern.cputime", percpu, &len, NULL, 0) < 0) { 77 error = errno; 78 goto done; 79 } else { 80 percpu = reallocf(percpu, len); 81 if (percpu == NULL) { 82 error = ENOMEM; 83 goto done; 84 } 85 } 86 87 /* aggregate per-cpu statistics retrieved from kernel */ 88 cpucount = len / sizeof(struct kinfo_cputime); 89 cputime_pcpu_statistics(percpu, cputime, cpucount); 90 91 done: 92 if (percpu != NULL) 93 free(percpu); 94 return (error); 95 } 96 97 int 98 kinfo_get_sched_hz(int *hz) 99 { 100 struct kinfo_clockinfo clockinfo; 101 size_t len = sizeof(clockinfo); 102 int retval; 103 104 retval = sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0); 105 if (retval) 106 return(retval); 107 108 *hz = clockinfo.ci_hz; 109 return(0); 110 } 111 112 int 113 kinfo_get_sched_stathz(int *stathz) 114 { 115 struct kinfo_clockinfo clockinfo; 116 size_t len = sizeof(clockinfo); 117 int retval; 118 119 retval = sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0); 120 if (retval) 121 return(retval); 122 123 *stathz = clockinfo.ci_stathz; 124 return(0); 125 } 126 127 int 128 kinfo_get_sched_profhz(int *profhz) 129 { 130 struct kinfo_clockinfo clockinfo; 131 size_t len = sizeof(clockinfo); 132 int retval; 133 134 retval = sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0); 135 if (retval) 136 return(retval); 137 138 *profhz = clockinfo.ci_profhz; 139 return(0); 140 } 141