lib/libkinfo/kinfo_sched.c

   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 }