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
  35 #include <sys/kinfo.h>
  36 #include <sys/param.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <assert.h>
  40 #include <stdlib.h>
  41 #include <errno.h>
  42 #include <kinfo.h>
  43
  44 int
  45 kinfo_get_cpus(int *ncpus)
  46 {
  47         size_t len = sizeof(*ncpus);
  48
  49         return(sysctlbyname("hw.ncpu", ncpus, &len, NULL, 0));
  50 }
  51
  52 int
  53 kinfo_get_sched_cputime(struct kinfo_cputime *cputime)
  54 {
  55         struct kinfo_cputime *percpu = NULL;
  56         size_t len = sizeof(struct kinfo_cputime) * SMP_MAXCPU;
  57         int cpucount, error = 0;
  58
  59         _DIAGASSERT(cputime != NULL);
  60
  61         if ((percpu = malloc(len)) == NULL) {
  62                 error = ENOMEM;
  63                 goto done;
  64         }
  65
  66         /* retrieve verbatim per-cpu statistics from kernel */
  67         if (sysctlbyname("kern.cputime", percpu, &len, NULL, 0) < 0) {
  68                 error = errno;
  69                 goto done;
  70         } else {
  71                 percpu = reallocf(percpu, len);
  72                 if (percpu == NULL) {
  73                         error = ENOMEM;
  74                         goto done;
  75                 }
  76         }
  77
  78         /* aggregate per-cpu statistics retrieved from kernel */
  79         cpucount = len / sizeof(struct kinfo_cputime);
  80         cputime_pcpu_statistics(percpu, cputime, cpucount);
  81
  82 done:
  83         if (percpu != NULL)
  84                 free(percpu);
  85         return (error);
  86 }
  87
  88 int
  89 kinfo_get_sched_hz(int *hz)
  90 {
  91         struct kinfo_clockinfo clockinfo;
  92         size_t len = sizeof(clockinfo);
  93         int retval;
  94
  95         retval = sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0);
  96         if (retval)
  97                 return(retval);
  98
  99         *hz = clockinfo.ci_hz;
 100         return(0);
 101 }
 102
 103 int
 104 kinfo_get_sched_stathz(int *stathz)
 105 {
 106         struct kinfo_clockinfo clockinfo;
 107         size_t len = sizeof(clockinfo);
 108         int retval;
 109
 110         retval = sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0);
 111         if (retval)
 112                 return(retval);
 113
 114         *stathz = clockinfo.ci_stathz;
 115         return(0);
 116 }
 117
 118 int
 119 kinfo_get_sched_profhz(int *profhz)
 120 {
 121         struct kinfo_clockinfo clockinfo;
 122         size_t len = sizeof(clockinfo);
 123         int retval;
 124
 125         retval = sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0);
 126         if (retval)
 127                 return(retval);
 128
 129         *profhz = clockinfo.ci_profhz;
 130         return(0);
 131 }