299 lines
8.2 KiB
C
299 lines
8.2 KiB
C
/* $NetBSD: dkstats.c,v 1.11 2001/01/27 11:08:23 enami Exp $ */
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/*
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* Copyright (c) 1996 John M. Vinopal
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by John M. Vinopal.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/sched.h>
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#include <sys/dkstat.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/disk.h>
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#include <err.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "dkstats.h"
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static struct nlist namelist[] = {
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#define X_TK_NIN 0
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{ "_tk_nin" }, /* tty characters in */
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#define X_TK_NOUT 1
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{ "_tk_nout" }, /* tty characters out */
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#define X_HZ 2
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{ "_hz" }, /* ticks per second */
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#define X_STATHZ 3
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{ "_stathz" },
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#define X_DISK_COUNT 4
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{ "_disk_count" }, /* number of disks */
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#define X_DISKLIST 5
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{ "_disklist" }, /* TAILQ of disks */
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{ NULL },
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};
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/* Structures to hold the statistics. */
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struct _disk cur, last;
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/* Kernel pointers: nlistf and memf defined in calling program. */
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static kvm_t *kd = NULL;
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extern char *nlistf;
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extern char *memf;
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/* Pointer to list of disks. */
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static struct disk *dk_drivehead = NULL;
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/* Backward compatibility references. */
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int dk_ndrive = 0;
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int *dk_select;
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char **dr_name;
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#define KVM_ERROR(_string) do { \
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warnx("%s", (_string)); \
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errx(1, "%s", kvm_geterr(kd)); \
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} while (/* CONSTCOND */0)
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/*
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* Dereference the namelist pointer `v' and fill in the local copy
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* 'p' which is of size 's'.
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*/
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#define deref_nl(v, p, s) do { \
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deref_kptr((void *)namelist[(v)].n_value, (p), (s)); \
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} while (/* CONSTCOND */0)
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/* Missing from <sys/time.h> */
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#define timerset(tvp, uvp) do { \
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((uvp)->tv_sec = (tvp)->tv_sec); \
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((uvp)->tv_usec = (tvp)->tv_usec); \
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} while (/* CONSTCOND */0)
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static void deref_kptr(void *, void *, size_t);
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/*
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* Take the delta between the present values and the last recorded
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* values, storing the present values in the 'last' structure, and
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* the delta values in the 'cur' structure.
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*/
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void
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dkswap(void)
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{
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u_int64_t tmp;
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int i;
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#define SWAP(fld) do { \
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tmp = cur.fld; \
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cur.fld -= last.fld; \
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last.fld = tmp; \
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} while (/* CONSTCOND */0)
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for (i = 0; i < dk_ndrive; i++) {
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struct timeval tmp_timer;
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if (!cur.dk_select[i])
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continue;
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/* Delta Values. */
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SWAP(dk_xfer[i]);
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SWAP(dk_seek[i]);
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SWAP(dk_bytes[i]);
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/* Delta Time. */
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timerclear(&tmp_timer);
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timerset(&(cur.dk_time[i]), &tmp_timer);
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timersub(&tmp_timer, &(last.dk_time[i]), &(cur.dk_time[i]));
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timerclear(&(last.dk_time[i]));
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timerset(&tmp_timer, &(last.dk_time[i]));
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}
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for (i = 0; i < CPUSTATES; i++) {
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SWAP(cp_time[i]);
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}
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SWAP(tk_nin);
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SWAP(tk_nout);
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#undef SWAP
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}
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/*
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* Read the disk statistics for each disk in the disk list.
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* Also collect statistics for tty i/o and cpu ticks.
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*/
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void
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dkreadstats(void)
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{
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struct disk cur_disk, *p;
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size_t ssize;
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int mib[2];
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int i;
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p = dk_drivehead;
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for (i = 0; i < dk_ndrive; i++) {
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deref_kptr(p, &cur_disk, sizeof(cur_disk));
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cur.dk_xfer[i] = cur_disk.dk_xfer;
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cur.dk_seek[i] = cur_disk.dk_seek;
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cur.dk_bytes[i] = cur_disk.dk_bytes;
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timerset(&(cur_disk.dk_time), &(cur.dk_time[i]));
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p = cur_disk.dk_link.tqe_next;
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}
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/*
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* XXX Need to locate the `correct' CPU when looking for this
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* XXX in crash dumps. Just don't report it for now, in that
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* XXX case.
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*/
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ssize = sizeof(cur.cp_time);
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memset(cur.cp_time, 0, ssize);
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if (memf == NULL) {
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mib[0] = CTL_KERN;
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mib[1] = KERN_CP_TIME;
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if (sysctl(mib, 2, cur.cp_time, &ssize, NULL, 0) < 0)
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memset(cur.cp_time, 0, sizeof(cur.cp_time));
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}
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deref_nl(X_TK_NIN, &cur.tk_nin, sizeof(cur.tk_nin));
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deref_nl(X_TK_NOUT, &cur.tk_nout, sizeof(cur.tk_nout));
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}
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/*
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* Perform all of the initialization and memory allocation needed to
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* track disk statistics.
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*/
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int
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dkinit(int select, gid_t egid)
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{
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gid_t oldgid;
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struct disklist_head disk_head;
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struct disk cur_disk, *p;
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char errbuf[_POSIX2_LINE_MAX];
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static int once = 0;
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extern int hz;
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int i;
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if (once)
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return (1);
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/* Assume privs for kvm access. */
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oldgid = getegid();
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(void)setegid(egid);
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/* Open the kernel. */
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if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
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errx(1, "kvm_openfiles: %s", errbuf);
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/* We are finished with privs now. */
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(void)setegid(oldgid);
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/* Obtain the namelist symbols from the kernel. */
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if (kvm_nlist(kd, namelist))
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KVM_ERROR("kvm_nlist failed to read symbols.");
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/* Get the number of attached drives. */
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deref_nl(X_DISK_COUNT, &dk_ndrive, sizeof(dk_ndrive));
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if (dk_ndrive < 0)
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errx(1, "invalid _disk_count %d.", dk_ndrive);
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else if (dk_ndrive == 0) {
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warnx("No drives attached.");
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} else {
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/* Get a pointer to the first disk. */
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deref_nl(X_DISKLIST, &disk_head, sizeof(disk_head));
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dk_drivehead = disk_head.tqh_first;
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}
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/* Get ticks per second. */
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deref_nl(X_STATHZ, &hz, sizeof(hz));
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if (!hz)
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deref_nl(X_HZ, &hz, sizeof(hz));
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/* Allocate space for the statistics. */
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cur.dk_time = calloc(dk_ndrive, sizeof(struct timeval));
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cur.dk_xfer = calloc(dk_ndrive, sizeof(u_int64_t));
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cur.dk_seek = calloc(dk_ndrive, sizeof(u_int64_t));
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cur.dk_bytes = calloc(dk_ndrive, sizeof(u_int64_t));
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last.dk_time = calloc(dk_ndrive, sizeof(struct timeval));
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last.dk_xfer = calloc(dk_ndrive, sizeof(u_int64_t));
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last.dk_seek = calloc(dk_ndrive, sizeof(u_int64_t));
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last.dk_bytes = calloc(dk_ndrive, sizeof(u_int64_t));
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cur.dk_select = calloc(dk_ndrive, sizeof(int));
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cur.dk_name = calloc(dk_ndrive, sizeof(char *));
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if (cur.dk_time == NULL|| cur.dk_xfer == NULL ||
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cur.dk_seek == NULL || cur.dk_bytes == NULL ||
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last.dk_time == NULL || last.dk_xfer == NULL ||
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last.dk_seek == NULL || last.dk_bytes == NULL ||
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cur.dk_select == NULL || cur.dk_name == NULL)
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errx(1, "Memory allocation failure.");
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/* Set up the compatibility interfaces. */
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dk_select = cur.dk_select;
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dr_name = cur.dk_name;
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/* Read the disk names and set intial selection. */
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p = dk_drivehead;
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for (i = 0; i < dk_ndrive; i++) {
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char buf[10];
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deref_kptr(p, &cur_disk, sizeof(cur_disk));
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deref_kptr(cur_disk.dk_name, buf, sizeof(buf));
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cur.dk_name[i] = strdup(buf);
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cur.dk_select[i] = select;
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p = cur_disk.dk_link.tqe_next;
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}
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/* Never do this initalization again. */
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once = 1;
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return (1);
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}
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/*
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* Dereference the kernel pointer `kptr' and fill in the local copy
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* pointed to by `ptr'. The storage space must be pre-allocated,
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* and the size of the copy passed in `len'.
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*/
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static void
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deref_kptr(void *kptr, void *ptr, size_t len)
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{
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char buf[128];
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if (kvm_read(kd, (u_long)kptr, (char *)ptr, len) != len) {
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memset(buf, 0, sizeof(buf));
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snprintf(buf, sizeof buf, "can't dereference kptr 0x%lx",
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(u_long)kptr);
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KVM_ERROR(buf);
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}
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}
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