e8865caffb
- Restore support for fetching swap information from crash dumps via kvm_get_swapinfo(3) to fix pstat -T/-s on crash dumps. Reviewed by: arch@, phk MFC after: 1 week
278 lines
6.8 KiB
C
278 lines
6.8 KiB
C
/*
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* Copyright (c) 1999, Matthew Dillon. All Rights Reserved.
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* Copyright (c) 2001, Thomas Moestl. 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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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/blist.h>
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#include <sys/sysctl.h>
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#include <vm/swap_pager.h>
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#include <vm/vm_param.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <paths.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 <limits.h>
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#include "kvm_private.h"
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static struct nlist kvm_swap_nl[] = {
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{ "_swtailq" }, /* list of swap devices and sizes */
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{ "_dmmax" }, /* maximum size of a swap block */
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{ NULL }
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};
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#define NL_SWTAILQ 0
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#define NL_DMMAX 1
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static int kvm_swap_nl_cached = 0;
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static int unswdev; /* number of found swap dev's */
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static int dmmax;
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static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int);
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static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int);
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static int nlist_init(kvm_t *);
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static int getsysctl(kvm_t *, char *, void *, size_t);
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#define KREAD(kd, addr, obj) \
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(kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
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#define KGET(idx, var) \
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KGET2(kvm_swap_nl[(idx)].n_value, var, kvm_swap_nl[(idx)].n_name)
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#define KGET2(addr, var, msg) \
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if (KREAD(kd, (u_long)(addr), (var))) { \
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_kvm_err(kd, kd->program, "cannot read %s", msg); \
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return (-1); \
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}
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#define GETSWDEVNAME(dev, str, flags) \
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if (dev == NODEV) { \
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strlcpy(str, "[NFS swap]", sizeof(str)); \
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} else { \
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snprintf( \
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str, sizeof(str),"%s%s", \
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((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \
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devname(dev, S_IFCHR) \
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); \
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}
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int
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kvm_getswapinfo(
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kvm_t *kd,
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struct kvm_swap *swap_ary,
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int swap_max,
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int flags
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) {
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/*
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* clear cache
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*/
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if (kd == NULL) {
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kvm_swap_nl_cached = 0;
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return(0);
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}
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if (ISALIVE(kd)) {
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return kvm_getswapinfo_sysctl(kd, swap_ary, swap_max, flags);
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} else {
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return kvm_getswapinfo_kvm(kd, swap_ary, swap_max, flags);
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}
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}
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int
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kvm_getswapinfo_kvm(
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kvm_t *kd,
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struct kvm_swap *swap_ary,
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int swap_max,
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int flags
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) {
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int i, ttl;
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TAILQ_HEAD(, swdevt) swtailq;
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struct swdevt *sp, swinfo;
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struct kvm_swap tot;
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if (!nlist_init(kd))
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return (-1);
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bzero(&tot, sizeof(tot));
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KGET(NL_SWTAILQ, &swtailq);
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sp = TAILQ_FIRST(&swtailq);
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for (i = 0; sp != NULL; i++) {
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KGET2(sp, &swinfo, "swinfo");
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ttl = swinfo.sw_nblks - dmmax;
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if (i < swap_max - 1) {
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bzero(&swap_ary[i], sizeof(swap_ary[i]));
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swap_ary[i].ksw_total = ttl;
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swap_ary[i].ksw_used = swinfo.sw_used;
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swap_ary[i].ksw_flags = swinfo.sw_flags;
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GETSWDEVNAME(swinfo.sw_dev, swap_ary[i].ksw_devname,
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flags);
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}
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tot.ksw_total += ttl;
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tot.ksw_used += swinfo.sw_used;
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sp = TAILQ_NEXT(&swinfo, sw_list);
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}
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if (i >= swap_max)
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i = swap_max - 1;
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if (i >= 0)
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swap_ary[i] = tot;
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return(i);
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}
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#define GETSYSCTL(kd, name, var) \
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getsysctl(kd, name, &(var), sizeof(var))
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/* The maximum MIB length for vm.swap_info and an additional device number */
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#define SWI_MAXMIB 3
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int
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kvm_getswapinfo_sysctl(
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kvm_t *kd,
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struct kvm_swap *swap_ary,
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int swap_max,
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int flags
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) {
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int ti, ttl;
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size_t mibi, len;
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int soid[SWI_MAXMIB];
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struct xswdev xsd;
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struct kvm_swap tot;
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if (!GETSYSCTL(kd, "vm.dmmax", dmmax))
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return -1;
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mibi = SWI_MAXMIB - 1;
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if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) {
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_kvm_err(kd, kd->program, "sysctlnametomib failed: %s",
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strerror(errno));
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return -1;
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}
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bzero(&tot, sizeof(tot));
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for (unswdev = 0;; unswdev++) {
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soid[mibi] = unswdev;
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len = sizeof(xsd);
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if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) {
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if (errno == ENOENT)
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break;
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_kvm_err(kd, kd->program, "cannot read sysctl: %s.",
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strerror(errno));
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return -1;
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}
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if (len != sizeof(xsd)) {
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_kvm_err(kd, kd->program, "struct xswdev has unexpected "
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"size; kernel and libkvm out of sync?");
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return -1;
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}
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if (xsd.xsw_version != XSWDEV_VERSION) {
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_kvm_err(kd, kd->program, "struct xswdev version "
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"mismatch; kernel and libkvm out of sync?");
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return -1;
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}
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ttl = xsd.xsw_nblks - dmmax;
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if (unswdev < swap_max - 1) {
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bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev]));
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swap_ary[unswdev].ksw_total = ttl;
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swap_ary[unswdev].ksw_used = xsd.xsw_used;
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swap_ary[unswdev].ksw_flags = xsd.xsw_flags;
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GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname,
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flags);
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}
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tot.ksw_total += ttl;
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tot.ksw_used += xsd.xsw_used;
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}
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ti = unswdev;
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if (ti >= swap_max)
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ti = swap_max - 1;
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if (ti >= 0)
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swap_ary[ti] = tot;
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return(ti);
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}
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static int
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nlist_init(kvm_t *kd)
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{
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TAILQ_HEAD(, swdevt) swtailq;
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struct swdevt *sp, swinfo;
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if (kvm_swap_nl_cached)
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return (1);
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if (kvm_nlist(kd, kvm_swap_nl) < 0)
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return (0);
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/* Required entries */
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if (kvm_swap_nl[NL_SWTAILQ].n_value == 0) {
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_kvm_err(kd, kd->program, "unable to find swtailq");
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return (0);
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}
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if (kvm_swap_nl[NL_DMMAX].n_value == 0) {
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_kvm_err(kd, kd->program, "unable to find dmmax");
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return (0);
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}
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/* Get globals, type of swap */
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KGET(NL_DMMAX, &dmmax);
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kvm_swap_nl_cached = 1;
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return (1);
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}
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static int
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getsysctl (
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kvm_t *kd,
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char *name,
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void *ptr,
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size_t len
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) {
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size_t nlen = len;
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if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
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_kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
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strerror(errno));
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return (0);
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}
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if (nlen != len) {
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_kvm_err(kd, kd->program, "sysctl %s has unexpected size", name);
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return (0);
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}
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return (1);
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}
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