2 * Copyright (c) 1999, Matthew Dillon. All Rights Reserved.
3 * Copyright (c) 2001, Thomas Moestl. All Rights Reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
33 #include <sys/blist.h>
34 #include <sys/sysctl.h>
36 #include <vm/swap_pager.h>
37 #include <vm/vm_param.h>
51 #include "kvm_private.h"
53 static struct nlist kvm_swap_nl[] = {
54 { .n_name = "_swtailq" }, /* list of swap devices and sizes */
55 { .n_name = "_dmmax" }, /* maximum size of a swap block */
62 static int kvm_swap_nl_cached = 0;
63 static int unswdev; /* number of found swap dev's */
66 static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int);
67 static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int);
68 static int nlist_init(kvm_t *);
69 static int getsysctl(kvm_t *, const char *, void *, size_t);
71 #define KREAD(kd, addr, obj) \
72 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
73 #define KGET(idx, var) \
74 KGET2(kvm_swap_nl[(idx)].n_value, var, kvm_swap_nl[(idx)].n_name)
75 #define KGET2(addr, var, msg) \
76 if (KREAD(kd, (u_long)(addr), (var))) { \
77 _kvm_err(kd, kd->program, "cannot read %s", msg); \
81 #define GETSWDEVNAME(dev, str, flags) \
83 strlcpy(str, "[NFS swap]", sizeof(str)); \
86 str, sizeof(str),"%s%s", \
87 ((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \
88 devname(dev, S_IFCHR) \
93 kvm_getswapinfo(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags)
100 kvm_swap_nl_cached = 0;
105 return kvm_getswapinfo_sysctl(kd, swap_ary, swap_max, flags);
107 return kvm_getswapinfo_kvm(kd, swap_ary, swap_max, flags);
112 kvm_getswapinfo_kvm(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max,
117 TAILQ_HEAD(, swdevt) swtailq;
118 struct swdevt *sp, swinfo;
124 bzero(&tot, sizeof(tot));
125 KGET(NL_SWTAILQ, &swtailq);
126 sp = TAILQ_FIRST(&swtailq);
127 for (i = 0; sp != NULL; i++) {
128 KGET2(sp, &swinfo, "swinfo");
129 ttl = swinfo.sw_nblks - dmmax;
130 if (i < swap_max - 1) {
131 bzero(&swap_ary[i], sizeof(swap_ary[i]));
132 swap_ary[i].ksw_total = ttl;
133 swap_ary[i].ksw_used = swinfo.sw_used;
134 swap_ary[i].ksw_flags = swinfo.sw_flags;
135 GETSWDEVNAME(swinfo.sw_dev, swap_ary[i].ksw_devname,
138 tot.ksw_total += ttl;
139 tot.ksw_used += swinfo.sw_used;
140 sp = TAILQ_NEXT(&swinfo, sw_list);
151 #define GETSYSCTL(kd, name, var) \
152 getsysctl(kd, name, &(var), sizeof(var))
154 /* The maximum MIB length for vm.swap_info and an additional device number */
158 kvm_getswapinfo_sysctl(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max,
164 int soid[SWI_MAXMIB];
168 if (!GETSYSCTL(kd, "vm.dmmax", dmmax))
171 mibi = SWI_MAXMIB - 1;
172 if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) {
173 _kvm_err(kd, kd->program, "sysctlnametomib failed: %s",
177 bzero(&tot, sizeof(tot));
178 for (unswdev = 0;; unswdev++) {
179 soid[mibi] = unswdev;
181 if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) {
184 _kvm_err(kd, kd->program, "cannot read sysctl: %s.",
188 if (len != sizeof(xsd)) {
189 _kvm_err(kd, kd->program, "struct xswdev has unexpected "
190 "size; kernel and libkvm out of sync?");
193 if (xsd.xsw_version != XSWDEV_VERSION) {
194 _kvm_err(kd, kd->program, "struct xswdev version "
195 "mismatch; kernel and libkvm out of sync?");
199 ttl = xsd.xsw_nblks - dmmax;
200 if (unswdev < swap_max - 1) {
201 bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev]));
202 swap_ary[unswdev].ksw_total = ttl;
203 swap_ary[unswdev].ksw_used = xsd.xsw_used;
204 swap_ary[unswdev].ksw_flags = xsd.xsw_flags;
205 GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname,
208 tot.ksw_total += ttl;
209 tot.ksw_used += xsd.xsw_used;
222 nlist_init(kvm_t *kd)
225 if (kvm_swap_nl_cached)
228 if (kvm_nlist(kd, kvm_swap_nl) < 0)
231 /* Required entries */
232 if (kvm_swap_nl[NL_SWTAILQ].n_value == 0) {
233 _kvm_err(kd, kd->program, "unable to find swtailq");
237 if (kvm_swap_nl[NL_DMMAX].n_value == 0) {
238 _kvm_err(kd, kd->program, "unable to find dmmax");
242 /* Get globals, type of swap */
243 KGET(NL_DMMAX, &dmmax);
245 kvm_swap_nl_cached = 1;
250 getsysctl(kvm_t *kd, const char *name, void *ptr, size_t len)
253 if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
254 _kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
259 _kvm_err(kd, kd->program, "sysctl %s has unexpected size", name);