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/*
* swapinfo
*
* Swapinfo will provide some information about the state of the swap
* space for the system. It'll determine the number of swap areas,
* their original size, and their utilization.
*
* Kevin Lahey, February 16, 1993
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/rlist.h>
#include <nlist.h>
#include <kvm.h>
#include <limits.h>
struct rlist *swaplist;
static struct nlist nl[] = {{"_swaplist"}, /* list of free swap areas */
#define VM_SWAPMAP 0
{"_swdevt"}, /* list of swap devices and sizes */
#define VM_SWDEVT 1
{"_nswap"}, /* size of largest swap device */
#define VM_NSWAP 2
{"_nswdev"}, /* number of swap devices */
#define VM_NSWDEV 3
{"_dmmax"}, /* maximum size of a swap block */
#define VM_DMMAX 4
{""}};
char *getbsize __P((int *, long *));
void usage __P((void));
main (argc, argv)
int argc;
char **argv;
{
int i, total_avail, total_free, total_partitions, *by_device,
nswap, nswdev, dmmax, ch;
struct swdevt *swdevt;
struct rlist head;
static long blocksize;
static int headerlen;
static char *header;
kvm_t *kd;
char errbuf[_POSIX2_LINE_MAX];
/* We are trying to be simple here: */
while ((ch = getopt(argc, argv, "k")) != EOF)
switch(ch) {
case 'k':
putenv("BLOCKSIZE=1k");
break;
case '?':
default:
usage();
}
/* Open up /dev/kmem for reading. */
kd = kvm_openfiles((char *)NULL, (char *)NULL, (char *)NULL, 0, errbuf);
if (kd == NULL) {
fprintf (stderr, "%s: kvm_openfiles: %s\n",
argv [0], errbuf);
exit (1);
}
/* Figure out the offset of the various structures we'll need. */
if (kvm_nlist(kd, nl) == -1) {
fprintf (stderr, "%s: kvm_nlist: %s\n",
argv [0], kvm_geterr(kd));
exit (1);
}
if (kvm_read(kd, nl[VM_NSWAP].n_value, &nswap, sizeof (nswap)) !=
sizeof (nswap)) {
fprintf (stderr, "%s: didn't read all of nswap\n",
argv [0]);
exit (5);
}
if (kvm_read(kd, nl[VM_NSWDEV].n_value, &nswdev, sizeof (nswdev)) !=
sizeof (nswdev)) {
fprintf (stderr, "%s: didn't read all of nswdev\n",
argv [0]);
exit (5);
}
if (kvm_read(kd, nl[VM_DMMAX].n_value, &dmmax, sizeof (dmmax)) !=
sizeof (dmmax)) {
fprintf (stderr, "%s: didn't read all of dmmax\n",
argv [0]);
exit (5);
}
if ((swdevt = malloc (sizeof (struct swdevt) * nswdev)) == NULL ||
(by_device = calloc (sizeof (*by_device), nswdev)) == NULL) {
perror ("malloc");
exit (5);
}
if (kvm_read(kd, nl[VM_SWDEVT].n_value, swdevt,
sizeof (struct swdevt) * nswdev) !=
sizeof (struct swdevt) * nswdev) {
fprintf (stderr, "%s: didn't read all of swdevt\n",
argv [0]);
exit (5);
}
if (kvm_read(kd, nl[0].n_value, &swaplist, sizeof (struct rlist *)) !=
sizeof (struct rlist *)) {
fprintf (stderr, "%s: didn't read all of swaplist\n",
argv [0]);
exit (5);
}
/* Traverse the list of free swap space... */
total_free = 0;
while (swaplist) {
int top, bottom, next_block;
if (kvm_read(kd, (long) swaplist, &head, sizeof (struct rlist )) !=
sizeof (struct rlist )) {
fprintf (stderr, "%s: didn't read all of head\n",
argv [0]);
exit (5);
}
top = head.rl_end;
bottom = head.rl_start;
total_free += top - bottom + 1;
/*
* Swap space is split up among the configured disk.
* The first dmmax blocks of swap space some from the
* first disk, the next dmmax blocks from the next,
* and so on. The list of free space joins adjacent
* free blocks, ignoring device boundries. If we want
* to keep track of this information per device, we'll
* just have to extract it ourselves.
*/
while (top / dmmax != bottom / dmmax) {
next_block = ((bottom + dmmax) / dmmax);
by_device [(bottom / dmmax) % nswdev] +=
next_block * dmmax - bottom;
bottom = next_block * dmmax;
}
by_device [(bottom / dmmax) % nswdev] +=
top - bottom + 1;
swaplist = head.rl_next;
}
header = getbsize(&headerlen, &blocksize);
printf ("%-10s %10s %10s %10s %10s\n",
"Device", header, "Used", "Available", "Capacity");
for (total_avail = total_partitions = i = 0; i < nswdev; i++) {
printf ("/dev/%-5s %10d ",
devname (swdevt [i].sw_dev, S_IFBLK),
swdevt [i].sw_nblks / (blocksize/512));
/*
* Don't report statistics for partitions which have not
* yet been activated via swapon(8).
*/
if (!swdevt [i].sw_freed) {
printf (" *** not available for swapping ***\n");
} else {
total_partitions++;
total_avail += swdevt [i].sw_nblks;
printf ("%10d %10d %7.0f%%\n",
(swdevt [i].sw_nblks - by_device [i]) / (blocksize/512),
by_device [i] / (blocksize/512),
(double) (swdevt [i].sw_nblks -
by_device [i]) /
(double) swdevt [i].sw_nblks * 100.0);
}
}
/*
* If only one partition has been set up via swapon(8), we don't
* need to bother with totals.
*/
if (total_partitions > 1)
printf ("%-10s %10d %10d %10d %7.0f%%\n", "Total",
total_avail / (blocksize/512),
(total_avail - total_free) / (blocksize/512),
total_free / (blocksize/512),
(double) (total_avail - total_free) /
(double) total_avail * 100.0);
exit (0);
}
void
usage()
{
(void)fprintf(stderr, "usage: swapinfo [-k]\n");
exit(1);
}
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