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4d554349 NW |
1 | /* |
2 | * swapinfo | |
3 | * | |
4 | * Swapinfo will provide some information about the state of the swap | |
5 | * space for the system. It'll determine the number of swap areas, | |
6 | * their original size, and their utilization. | |
7 | * | |
8 | * Kevin Lahey, February 16, 1993 | |
9 | */ | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <sys/types.h> | |
14 | #include <sys/ioctl.h> | |
15 | #include <sys/termios.h> | |
16 | #include <sys/stat.h> | |
17 | #include <sys/tty.h> | |
18 | #include <sys/uio.h> | |
19 | #include <sys/buf.h> | |
20 | #include <sys/conf.h> | |
21 | #include <sys/rlist.h> /* swapmap defined here... */ | |
22 | #include <nlist.h> | |
23 | ||
24 | ||
25 | static struct nlist nl[] = {{"_swapmap"}, /* list of free swap areas */ | |
26 | #define VM_SWAPMAP 0 | |
27 | {"_swdevt"}, /* list of swap devices and sizes */ | |
28 | #define VM_SWDEVT 1 | |
29 | {"_nswap"}, /* size of largest swap device */ | |
30 | #define VM_NSWAP 2 | |
31 | {"_nswdev"}, /* number of swap devices */ | |
32 | #define VM_NSWDEV 3 | |
33 | {"_dmmax"}, /* maximum size of a swap block */ | |
34 | #define VM_DMMAX 4 | |
35 | {""}}; | |
36 | ||
4e97a0eb | 37 | char *getbsize __P((char *, int *, long *)); |
4d554349 NW |
38 | |
39 | main (argc, argv) | |
40 | int argc; | |
41 | char **argv; | |
42 | { | |
43 | int i, total_avail, total_free, total_partitions, *by_device, | |
44 | use_k = 1, /* used as a divisor, so 1 == blocks, 2 == K */ | |
45 | nswap, nswdev, dmmax; | |
46 | struct swdevt *swdevt; | |
47 | struct rlist head; | |
4e97a0eb NW |
48 | static long blocksize; |
49 | static int headerlen; | |
50 | static char *header; | |
4d554349 NW |
51 | |
52 | /* We are trying to be simple here: */ | |
53 | ||
54 | if (argc > 1) | |
4e97a0eb NW |
55 | { |
56 | fprintf (stderr, "Usage: swapinfo\n"); | |
57 | exit (1); | |
58 | } | |
4d554349 NW |
59 | |
60 | /* Open up /dev/kmem for reading. */ | |
61 | ||
62 | if (kvm_openfiles (NULL, NULL, NULL) == -1) { | |
63 | fprintf (stderr, "%s: kvm_openfiles: %s\n", | |
64 | argv [0], kvm_geterr()); | |
65 | exit (1); | |
66 | } | |
67 | ||
68 | /* Figure out the offset of the various structures we'll need. */ | |
69 | ||
70 | if (kvm_nlist (nl) == -1) { | |
71 | fprintf (stderr, "%s: kvm_nlist: %s\n", | |
72 | argv [0], kvm_geterr()); | |
73 | exit (1); | |
74 | } | |
75 | ||
76 | if (kvm_read (nl [VM_NSWAP].n_value, &nswap, sizeof (nswap)) != | |
77 | sizeof (nswap)) { | |
78 | fprintf (stderr, "%s: didn't read all of nswap\n", | |
79 | argv [0]); | |
80 | exit (5); | |
81 | } | |
82 | ||
83 | if (kvm_read (nl [VM_NSWDEV].n_value, &nswdev, sizeof (nswdev)) != | |
84 | sizeof (nswdev)) { | |
85 | fprintf (stderr, "%s: didn't read all of nswdev\n", | |
86 | argv [0]); | |
87 | exit (5); | |
88 | } | |
89 | ||
90 | if (kvm_read (nl [VM_DMMAX].n_value, &dmmax, sizeof (dmmax)) != | |
91 | sizeof (dmmax)) { | |
92 | fprintf (stderr, "%s: didn't read all of dmmax\n", | |
93 | argv [0]); | |
94 | exit (5); | |
95 | } | |
96 | ||
97 | if ((swdevt = malloc (sizeof (struct swdevt) * nswdev)) == NULL || | |
98 | (by_device = calloc (sizeof (*by_device), nswdev)) == NULL) { | |
99 | perror ("malloc"); | |
100 | exit (5); | |
101 | } | |
102 | ||
103 | if (kvm_read (nl [VM_SWDEVT].n_value, swdevt, | |
104 | sizeof (struct swdevt) * nswdev) != | |
105 | sizeof (struct swdevt) * nswdev) { | |
106 | fprintf (stderr, "%s: didn't read all of swdevt\n", | |
107 | argv [0]); | |
108 | exit (5); | |
109 | } | |
110 | ||
111 | if (kvm_read (nl [0].n_value, &swapmap, sizeof (struct rlist *)) != | |
112 | sizeof (struct rlist *)) { | |
113 | fprintf (stderr, "%s: didn't read all of swapmap\n", | |
114 | argv [0]); | |
115 | exit (5); | |
116 | } | |
117 | ||
118 | /* Traverse the list of free swap space... */ | |
119 | ||
120 | total_free = 0; | |
121 | while (swapmap) { | |
122 | int top, bottom, next_block; | |
123 | ||
124 | if (kvm_read ((long) swapmap, &head, sizeof (struct rlist )) != | |
125 | sizeof (struct rlist )) { | |
126 | fprintf (stderr, "%s: didn't read all of head\n", | |
127 | argv [0]); | |
128 | exit (5); | |
129 | } | |
130 | ||
131 | top = head.rl_end; | |
132 | bottom = head.rl_start; | |
133 | ||
134 | total_free += top - bottom + 1; | |
135 | ||
136 | /* | |
137 | * Swap space is split up among the configured disk. | |
138 | * The first dmmax blocks of swap space some from the | |
139 | * first disk, the next dmmax blocks from the next, | |
140 | * and so on. The list of free space joins adjacent | |
141 | * free blocks, ignoring device boundries. If we want | |
142 | * to keep track of this information per device, we'll | |
143 | * just have to extract it ourselves. | |
144 | */ | |
145 | ||
146 | while (top / dmmax != bottom / dmmax) { | |
147 | next_block = ((bottom + dmmax) / dmmax); | |
148 | by_device [(bottom / dmmax) % nswdev] += | |
149 | next_block * dmmax - bottom; | |
150 | bottom = next_block * dmmax; | |
151 | } | |
152 | ||
153 | by_device [(bottom / dmmax) % nswdev] += | |
154 | top - bottom + 1; | |
155 | ||
156 | swapmap = head.rl_next; | |
157 | } | |
158 | ||
4e97a0eb | 159 | header = getbsize("swapinfo", &headerlen, &blocksize); |
4d554349 | 160 | printf ("%-10s %10s %10s %10s %10s\n", |
4e97a0eb | 161 | "Device", header, "Used", "Available", "Capacity"); |
4d554349 NW |
162 | for (total_avail = total_partitions = i = 0; i < nswdev; i++) { |
163 | printf ("/dev/%-5s %10d ", | |
164 | devname (swdevt [i].sw_dev, S_IFBLK), | |
165 | swdevt [i].sw_nblks / use_k); | |
166 | ||
167 | /* | |
168 | * Don't report statistics for partitions which have not | |
169 | * yet been activated via swapon(8). | |
170 | */ | |
171 | ||
172 | if (!swdevt [i].sw_freed) { | |
173 | printf (" *** not available for swapping ***\n"); | |
174 | } else { | |
175 | total_partitions++; | |
176 | total_avail += swdevt [i].sw_nblks; | |
177 | printf ("%10d %10d %7.0f%%\n", | |
178 | (swdevt [i].sw_nblks - by_device [i]) / use_k, | |
179 | by_device [i] / use_k, | |
180 | (double) (swdevt [i].sw_nblks - | |
181 | by_device [i]) / | |
182 | (double) swdevt [i].sw_nblks * 100.0); | |
183 | } | |
184 | } | |
185 | ||
186 | /* | |
187 | * If only one partition has been set up via swapon(8), we don't | |
188 | * need to bother with totals. | |
189 | */ | |
190 | ||
191 | if (total_partitions > 1) | |
192 | printf ("%-10s %10d %10d %10d %7.0f%%\n", "Total", | |
193 | total_avail / use_k, | |
194 | (total_avail - total_free) / use_k, | |
195 | total_free / use_k, | |
196 | (double) (total_avail - total_free) / | |
197 | (double) total_avail * 100.0); | |
198 | ||
199 | exit (0); | |
200 | } |