test/debug/schedmon.c

   1 /*
   2  * SCHEDMON.C
   3  *
   4  * cc -I/usr/src/sys schedmon.c -o ~/bin/schedmon -lkvm
   5  *
   6  * Monitor the user scheduler
   7  *
   8  * Copyright (c) 2020 The DragonFly Project.  All rights reserved.
   9  *
  10  * This code is derived from software contributed to The DragonFly Project
  11  * by Matthew Dillon <dillon@backplane.com>
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in
  21  *    the documentation and/or other materials provided with the
  22  *    distribution.
  23  * 3. Neither the name of The DragonFly Project nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific, prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  31  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  32  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  33  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  35  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  36  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  37  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  * $DragonFly: src/test/debug/ncptrace.c,v 1.7 2007/05/06 20:45:01 dillon Exp $
  41  */
  42
  43 #define _KERNEL_STRUCTURES
  44 #include <sys/param.h>
  45 #include <sys/user.h>
  46 #include <sys/malloc.h>
  47 #include <sys/signalvar.h>
  48 #include <sys/vnode.h>
  49 #include <sys/namecache.h>
  50 #include <sys/mount.h>
  51 #include <sys/cpu_topology.h>
  52
  53 #include <vm/vm.h>
  54 #include <vm/vm_page.h>
  55 #include <vm/vm_kern.h>
  56 #include <vm/swap_pager.h>
  57 #include <vm/vnode_pager.h>
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <fcntl.h>
  63 #include <kvm.h>
  64 #include <nlist.h>
  65 #include <getopt.h>
  66
  67 #include <sys/usched_dfly.h>
  68
  69 struct nlist Nl[] = {
  70     { "_ncpus" },
  71     { "_dfly_pcpu" },
  72     { NULL }
  73 };
  74
  75 static void kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes);
  76
  77 int
  78 main(int ac, char **av)
  79 {
  80     struct usched_dfly_pcpu *pcpu;
  81     struct usched_dfly_pcpu *scan;
  82     const char *corefile = NULL;
  83     const char *sysfile = NULL;
  84     const char *path;
  85     kvm_t *kd;
  86     int ncpus;
  87     int ch;
  88     int i;
  89
  90     while ((ch = getopt(ac, av, "M:N:")) != -1) {
  91         switch(ch) {
  92         case 'M':
  93             corefile = optarg;
  94             break;
  95         case 'N':
  96             sysfile = optarg;
  97             break;
  98         default:
  99             fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
 100             exit(1);
 101         }
 102     }
 103     ac -= optind;
 104     av += optind;
 105
 106     if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
 107         perror("kvm_open");
 108         exit(1);
 109     }
 110     if (kvm_nlist(kd, Nl) != 0) {
 111         perror("kvm_nlist");
 112         exit(1);
 113     }
 114     usleep(100000);
 115     kkread(kd, Nl[0].n_value, &ncpus, sizeof(ncpus));
 116     pcpu = malloc(ncpus * sizeof(*pcpu));
 117     kkread(kd, Nl[1].n_value, pcpu, ncpus * sizeof(*pcpu));
 118
 119     printf("%p %d\n", pcpu, ncpus);
 120     for (i = 0; i < ncpus; ++i) {
 121         scan = &pcpu[i];
 122
 123         printf("%3d ", i);
 124         if (scan->ucount == 0 && scan->uload == 0 && scan->uschedcp == NULL) {
 125                 printf("IDLE                                               "
 126                         "                    ");
 127         } else {
 128                 printf("runq=%-3d ucount=%-3d uload=%-5d ",
 129                         scan->runqcount, scan->ucount, scan->uload);
 130                 if (scan->uschedcp)
 131                         printf("uschedcp=%p ", scan->uschedcp);
 132                 else
 133                         printf("uschedcp=------------------ ");
 134                 if (scan->queuebits)
 135                         printf("qs=%08x", scan->queuebits);
 136                 else
 137                         printf("qs=EMPTY   ");
 138         }
 139         if (i & 1)
 140                 printf("\n");
 141         else
 142                 printf("\t");
 143     }
 144 }
 145
 146 static void
 147 kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
 148 {
 149     if (kvm_read(kd, addr, buf, nbytes) != nbytes) {
 150         perror("kvm_read");
 151         exit(1);
 152     }
 153 }