lib/libkcore/kcore_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/libkcore/kcore_sched.c,v 1.5 2006/08/03 18:40:46 swildner Exp $
  35  */
  36
  37 #include <sys/param.h>
  38
  39 #include <assert.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <kcore.h>
  43 #include <kvm.h>
  44 #include <nlist.h>
  45 #include <stdlib.h>
  46
  47 #include "kcore_private.h"
  48
  49 int
  50 kcore_get_cpus(struct kcore_data *kc, int *ncpus)
  51 {
  52         static struct nlist nl[] = {
  53                 { "_ncpus", 0, 0, 0, 0},
  54                 { NULL, 0, 0, 0, 0}
  55         };
  56
  57         /* XXX always include ncpus in the kernel. */
  58         if (kcore_get_generic(kc, nl, ncpus, sizeof(*ncpus)))
  59                 *ncpus = 1;
  60         return(0);
  61 }
  62
  63 int
  64 kcore_get_sched_ccpu(struct kcore_data *kc, int *ccpu)
  65 {
  66         static struct nlist nl[] = {
  67                 { "_tk_nin", 0, 0, 0, 0},
  68                 { NULL, 0, 0, 0, 0}
  69         };
  70
  71         return(kcore_get_generic(kc, nl, ccpu, sizeof(*ccpu)));
  72 }
  73
  74 int
  75 kcore_get_sched_cputime(struct kcore_data *kc, struct kinfo_cputime *cputime)
  76 {
  77         struct kinfo_cputime *percpu = NULL;
  78         static struct nlist nl[] = {
  79                 { "cputime_percpu", 0, 0, 0, 0},
  80                 { NULL, 0, 0, 0, 0}
  81         };
  82         size_t len;
  83         int cpucount, error = 0;
  84
  85         _DIAGASSERT(cputime != NULL);
  86
  87         error = kcore_get_cpus(kc, &cpucount);
  88         if (error)
  89                 goto done;
  90
  91         len = sizeof(*percpu) * cpucount;
  92
  93         if ((percpu = malloc(len)) == NULL) {
  94                 error = ENOMEM;
  95                 goto done;
  96         }
  97
  98         /* retrieve verbatim per-cpu statistics from kernel core */
  99         error = kcore_get_generic(kc, nl, percpu, len);
 100         if (error)
 101                 goto done;
 102
 103         /* aggregate per-cpu statistics retrieved from kernel core */
 104         cputime_pcpu_statistics(percpu, cputime, cpucount);
 105
 106 done:
 107         if (percpu != NULL) {
 108                 free(percpu);
 109                 percpu = NULL;
 110         }
 111         return (error);
 112 }
 113
 114 int
 115 kcore_get_sched_hz(struct kcore_data *kc, int *hz)
 116 {
 117         static struct nlist nl[] = {
 118                 { "_hz", 0, 0, 0, 0},
 119                 { NULL, 0, 0, 0, 0}
 120         };
 121
 122         return(kcore_get_generic(kc, nl, hz, sizeof(*hz)));
 123 }
 124
 125 int
 126 kcore_get_sched_profhz(struct kcore_data *kc, int *profhz)
 127 {
 128         static struct nlist nl[] = {
 129                 { "_profhz", 0, 0, 0, 0},
 130                 { NULL, 0, 0, 0, 0}
 131         };
 132
 133         return(kcore_get_generic(kc, nl, profhz, sizeof(*profhz)));
 134 }
 135
 136 int
 137 kcore_get_sched_stathz(struct kcore_data *kc, int *stathz)
 138 {
 139         static struct nlist nl[] = {
 140                 { "_stathz", 0, 0, 0, 0},
 141                 { NULL, 0, 0, 0, 0}
 142         };
 143         int retval;
 144
 145         retval = kcore_get_generic(kc, nl, stathz, sizeof(*stathz));
 146         if (retval == 0 && *stathz == 0)
 147                 return(kcore_get_sched_hz(kc, stathz));
 148         return(retval);
 149 }