2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999, Matthew Dillon. All Rights Reserved.
5 * Copyright (c) 2001, Thomas Moestl. All Rights Reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
35 #include <sys/blist.h>
36 #include <sys/queue.h>
37 #include <sys/sysctl.h>
39 #include <vm/swap_pager.h>
40 #include <vm/vm_param.h>
54 #include "kvm_private.h"
56 static struct nlist kvm_swap_nl[] = {
57 { .n_name = "_swtailq" }, /* list of swap devices and sizes */
58 { .n_name = "_dmmax" }, /* maximum size of a swap block */
65 static int kvm_swap_nl_cached = 0;
66 static int unswdev; /* number of found swap dev's */
69 static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int);
70 static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int);
71 static int nlist_init(kvm_t *);
72 static int getsysctl(kvm_t *, const char *, void *, size_t);
74 #define KREAD(kd, addr, obj) \
75 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
76 #define KGET(idx, var) \
77 KGET2(kvm_swap_nl[(idx)].n_value, var, kvm_swap_nl[(idx)].n_name)
78 #define KGET2(addr, var, msg) \
79 if (KREAD(kd, (u_long)(addr), (var))) { \
80 _kvm_err(kd, kd->program, "cannot read %s", msg); \
84 #define GETSWDEVNAME(dev, str, flags) \
86 strlcpy(str, "[NFS swap]", sizeof(str)); \
89 str, sizeof(str),"%s%s", \
90 ((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \
91 devname(dev, S_IFCHR) \
96 kvm_getswapinfo(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags)
103 kvm_swap_nl_cached = 0;
108 return kvm_getswapinfo_sysctl(kd, swap_ary, swap_max, flags);
110 return kvm_getswapinfo_kvm(kd, swap_ary, swap_max, flags);
115 kvm_getswapinfo_kvm(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max,
119 TAILQ_HEAD(, swdevt) swtailq;
120 struct swdevt *sp, swinfo;
123 if (!kd->arch->ka_native(kd)) {
124 _kvm_err(kd, kd->program,
125 "cannot read swapinfo from non-native core");
132 bzero(&tot, sizeof(tot));
133 KGET(NL_SWTAILQ, &swtailq);
134 sp = TAILQ_FIRST(&swtailq);
135 for (i = 0; sp != NULL; i++) {
136 KGET2(sp, &swinfo, "swinfo");
137 ttl = swinfo.sw_nblks - dmmax;
138 if (i < swap_max - 1) {
139 bzero(&swap_ary[i], sizeof(swap_ary[i]));
140 swap_ary[i].ksw_total = ttl;
141 swap_ary[i].ksw_used = swinfo.sw_used;
142 swap_ary[i].ksw_flags = swinfo.sw_flags;
143 GETSWDEVNAME(swinfo.sw_dev, swap_ary[i].ksw_devname,
146 tot.ksw_total += ttl;
147 tot.ksw_used += swinfo.sw_used;
148 sp = TAILQ_NEXT(&swinfo, sw_list);
159 #define GETSYSCTL(kd, name, var) \
160 getsysctl(kd, name, &(var), sizeof(var))
162 /* The maximum MIB length for vm.swap_info and an additional device number */
166 kvm_getswapinfo_sysctl(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max,
171 int soid[SWI_MAXMIB];
175 if (!GETSYSCTL(kd, "vm.dmmax", dmmax))
178 mibi = SWI_MAXMIB - 1;
179 if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) {
180 _kvm_err(kd, kd->program, "sysctlnametomib failed: %s",
184 bzero(&tot, sizeof(tot));
185 for (unswdev = 0;; unswdev++) {
186 soid[mibi] = unswdev;
188 if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) {
191 _kvm_err(kd, kd->program, "cannot read sysctl: %s.",
195 if (len != sizeof(xsd)) {
196 _kvm_err(kd, kd->program, "struct xswdev has unexpected "
197 "size; kernel and libkvm out of sync?");
200 if (xsd.xsw_version != XSWDEV_VERSION) {
201 _kvm_err(kd, kd->program, "struct xswdev version "
202 "mismatch; kernel and libkvm out of sync?");
206 ttl = xsd.xsw_nblks - dmmax;
207 if (unswdev < swap_max - 1) {
208 bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev]));
209 swap_ary[unswdev].ksw_total = ttl;
210 swap_ary[unswdev].ksw_used = xsd.xsw_used;
211 swap_ary[unswdev].ksw_flags = xsd.xsw_flags;
212 GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname,
215 tot.ksw_total += ttl;
216 tot.ksw_used += xsd.xsw_used;
229 nlist_init(kvm_t *kd)
232 if (kvm_swap_nl_cached)
235 if (kvm_nlist(kd, kvm_swap_nl) < 0)
238 /* Required entries */
239 if (kvm_swap_nl[NL_SWTAILQ].n_value == 0) {
240 _kvm_err(kd, kd->program, "unable to find swtailq");
244 if (kvm_swap_nl[NL_DMMAX].n_value == 0) {
245 _kvm_err(kd, kd->program, "unable to find dmmax");
249 /* Get globals, type of swap */
250 KGET(NL_DMMAX, &dmmax);
252 kvm_swap_nl_cached = 1;
257 getsysctl(kvm_t *kd, const char *name, void *ptr, size_t len)
260 if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
261 _kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
266 _kvm_err(kd, kd->program, "sysctl %s has unexpected size", name);