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