mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
421 lines
8.1 KiB
C
421 lines
8.1 KiB
C
/*
|
|
* Copyright (c) 1999, Matthew Dillon. All Rights Reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided under the terms of the BSD
|
|
* Copyright as found in /usr/src/COPYRIGHT in the FreeBSD source tree.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1999\n"
|
|
"Matthew Dillon. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/ucred.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/blist.h>
|
|
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <kvm.h>
|
|
#include <limits.h>
|
|
#include <nlist.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
static struct nlist kvm_swap_nl[] = {
|
|
{ "_swapblist" }, /* new radix swap list */
|
|
{ "_swdevt" }, /* list of swap devices and sizes */
|
|
{ "_nswdev" }, /* number of swap devices */
|
|
{ "_dmmax" }, /* maximum size of a swap block */
|
|
{ "" }
|
|
};
|
|
|
|
#define NL_SWAPBLIST 0
|
|
#define NL_SWDEVT 1
|
|
#define NL_NSWDEV 2
|
|
#define NL_DMMAX 3
|
|
|
|
static int kvm_swap_nl_cached = 0;
|
|
static int nswdev;
|
|
static int unswdev;
|
|
static int dmmax;
|
|
|
|
static void getswapinfo_radix(kvm_t *kd, struct kvm_swap *swap_ary,
|
|
int swap_max, int flags);
|
|
|
|
#define SVAR(var) __STRING(var) /* to force expansion */
|
|
#define KGET(idx, var) \
|
|
KGET1(idx, &var, sizeof(var), SVAR(var))
|
|
#define KGET1(idx, p, s, msg) \
|
|
KGET2(kvm_swap_nl[idx].n_value, p, s, msg)
|
|
#define KGET2(addr, p, s, msg) \
|
|
if (kvm_read(kd, (u_long)(addr), p, s) != s) \
|
|
warnx("cannot read %s: %s", msg, kvm_geterr(kd))
|
|
#define KGETN(idx, var) \
|
|
KGET1N(idx, &var, sizeof(var), SVAR(var))
|
|
#define KGET1N(idx, p, s, msg) \
|
|
KGET2N(kvm_swap_nl[idx].n_value, p, s, msg)
|
|
#define KGET2N(addr, p, s, msg) \
|
|
((kvm_read(kd, (u_long)(addr), p, s) == s) ? 1 : 0)
|
|
#define KGETRET(addr, p, s, msg) \
|
|
if (kvm_read(kd, (u_long)(addr), p, s) != s) { \
|
|
warnx("cannot read %s: %s", msg, kvm_geterr(kd)); \
|
|
return (0); \
|
|
}
|
|
|
|
int
|
|
kvm_getswapinfo(
|
|
kvm_t *kd,
|
|
struct kvm_swap *swap_ary,
|
|
int swap_max,
|
|
int flags
|
|
) {
|
|
int ti = 0;
|
|
|
|
/*
|
|
* clear cache
|
|
*/
|
|
if (kd == NULL) {
|
|
kvm_swap_nl_cached = 0;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* namelist
|
|
*/
|
|
if (kvm_swap_nl_cached == 0) {
|
|
struct swdevt *sw;
|
|
|
|
if (kvm_nlist(kd, kvm_swap_nl) < 0)
|
|
return(-1);
|
|
|
|
/*
|
|
* required entries
|
|
*/
|
|
|
|
if (
|
|
kvm_swap_nl[NL_SWDEVT].n_value == 0 ||
|
|
kvm_swap_nl[NL_NSWDEV].n_value == 0 ||
|
|
kvm_swap_nl[NL_DMMAX].n_value == 0 ||
|
|
kvm_swap_nl[NL_SWAPBLIST].n_type == 0
|
|
) {
|
|
return(-1);
|
|
}
|
|
|
|
/*
|
|
* get globals, type of swap
|
|
*/
|
|
|
|
KGET(NL_NSWDEV, nswdev);
|
|
KGET(NL_DMMAX, dmmax);
|
|
|
|
/*
|
|
* figure out how many actual swap devices are enabled
|
|
*/
|
|
|
|
KGET(NL_SWDEVT, sw);
|
|
for (unswdev = nswdev - 1; unswdev >= 0; --unswdev) {
|
|
struct swdevt swinfo;
|
|
|
|
KGET2(&sw[unswdev], &swinfo, sizeof(swinfo), "swinfo");
|
|
if (swinfo.sw_nblks)
|
|
break;
|
|
}
|
|
++unswdev;
|
|
|
|
kvm_swap_nl_cached = 1;
|
|
}
|
|
|
|
|
|
{
|
|
struct swdevt *sw;
|
|
int i;
|
|
|
|
ti = unswdev;
|
|
if (ti >= swap_max)
|
|
ti = swap_max - 1;
|
|
|
|
if (ti >= 0)
|
|
bzero(swap_ary, sizeof(struct kvm_swap) * (ti + 1));
|
|
|
|
KGET(NL_SWDEVT, sw);
|
|
for (i = 0; i < unswdev; ++i) {
|
|
struct swdevt swinfo;
|
|
int ttl;
|
|
|
|
KGET2(&sw[i], &swinfo, sizeof(swinfo), "swinfo");
|
|
|
|
/*
|
|
* old style: everything in DEV_BSIZE'd chunks,
|
|
* convert to pages.
|
|
*
|
|
* new style: swinfo in DEV_BSIZE'd chunks but dmmax
|
|
* in pages.
|
|
*
|
|
* The first dmmax is never allocating to avoid
|
|
* trashing the disklabels
|
|
*/
|
|
|
|
ttl = swinfo.sw_nblks - dmmax;
|
|
|
|
if (ttl == 0)
|
|
continue;
|
|
|
|
if (i < ti) {
|
|
swap_ary[i].ksw_total = ttl;
|
|
swap_ary[i].ksw_used = ttl;
|
|
swap_ary[i].ksw_flags = swinfo.sw_flags;
|
|
if (swinfo.sw_dev == NODEV) {
|
|
snprintf(
|
|
swap_ary[i].ksw_devname,
|
|
sizeof(swap_ary[i].ksw_devname),
|
|
"%s",
|
|
"[NFS swap]"
|
|
);
|
|
} else {
|
|
snprintf(
|
|
swap_ary[i].ksw_devname,
|
|
sizeof(swap_ary[i].ksw_devname),
|
|
"%s%s",
|
|
((flags & SWIF_DEV_PREFIX) ? "/dev/" : ""),
|
|
devname(swinfo.sw_dev, S_IFBLK)
|
|
);
|
|
}
|
|
}
|
|
if (ti >= 0) {
|
|
swap_ary[ti].ksw_total += ttl;
|
|
swap_ary[ti].ksw_used += ttl;
|
|
}
|
|
}
|
|
}
|
|
|
|
getswapinfo_radix(kd, swap_ary, swap_max, flags);
|
|
return(ti);
|
|
}
|
|
|
|
/*
|
|
* scanradix() - support routine for radix scanner
|
|
*/
|
|
|
|
#define TABME tab, tab, ""
|
|
|
|
static int
|
|
scanradix(
|
|
blmeta_t *scan,
|
|
daddr_t blk,
|
|
daddr_t radix,
|
|
daddr_t skip,
|
|
daddr_t count,
|
|
kvm_t *kd,
|
|
int dmmax,
|
|
int nswdev,
|
|
struct kvm_swap *swap_ary,
|
|
int swap_max,
|
|
int tab,
|
|
int flags
|
|
) {
|
|
blmeta_t meta;
|
|
int ti = (unswdev >= swap_max) ? swap_max - 1 : unswdev;
|
|
|
|
KGET2(scan, &meta, sizeof(meta), "blmeta_t");
|
|
|
|
/*
|
|
* Terminator
|
|
*/
|
|
if (meta.bm_bighint == (daddr_t)-1) {
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("%*.*s(0x%06x,%d) Terminator\n",
|
|
TABME,
|
|
blk,
|
|
radix
|
|
);
|
|
}
|
|
return(-1);
|
|
}
|
|
|
|
if (radix == BLIST_BMAP_RADIX) {
|
|
/*
|
|
* Leaf bitmap
|
|
*/
|
|
int i;
|
|
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("%*.*s(0x%06x,%d) Bitmap %08x big=%d\n",
|
|
TABME,
|
|
blk,
|
|
radix,
|
|
(int)meta.u.bmu_bitmap,
|
|
meta.bm_bighint
|
|
);
|
|
}
|
|
|
|
/*
|
|
* If not all allocated, count.
|
|
*/
|
|
if (meta.u.bmu_bitmap != 0) {
|
|
for (i = 0; i < BLIST_BMAP_RADIX && i < count; ++i) {
|
|
/*
|
|
* A 0 bit means allocated
|
|
*/
|
|
if ((meta.u.bmu_bitmap & (1 << i))) {
|
|
int t = 0;
|
|
|
|
if (nswdev)
|
|
t = (blk + i) / dmmax % nswdev;
|
|
if (t < ti)
|
|
--swap_ary[t].ksw_used;
|
|
if (ti >= 0)
|
|
--swap_ary[ti].ksw_used;
|
|
}
|
|
}
|
|
}
|
|
} else if (meta.u.bmu_avail == radix) {
|
|
/*
|
|
* Meta node if all free
|
|
*/
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("%*.*s(0x%06x,%d) Submap ALL-FREE {\n",
|
|
TABME,
|
|
blk,
|
|
radix,
|
|
(int)meta.u.bmu_avail,
|
|
meta.bm_bighint
|
|
);
|
|
}
|
|
/*
|
|
* Note: both dmmax and radix are powers of 2. However, dmmax
|
|
* may be larger then radix so use a smaller increment if
|
|
* necessary.
|
|
*/
|
|
{
|
|
int t;
|
|
int tinc = dmmax;
|
|
|
|
while (tinc > radix)
|
|
tinc >>= 1;
|
|
|
|
for (t = blk; t < blk + radix; t += tinc) {
|
|
int u = (nswdev) ? (t / dmmax % nswdev) : 0;
|
|
|
|
if (u < ti)
|
|
swap_ary[u].ksw_used -= tinc;
|
|
if (ti >= 0)
|
|
swap_ary[ti].ksw_used -= tinc;
|
|
}
|
|
}
|
|
} else if (meta.u.bmu_avail == 0) {
|
|
/*
|
|
* Meta node if all used
|
|
*/
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("%*.*s(0x%06x,%d) Submap ALL-ALLOCATED\n",
|
|
TABME,
|
|
blk,
|
|
radix,
|
|
(int)meta.u.bmu_avail,
|
|
meta.bm_bighint
|
|
);
|
|
}
|
|
} else {
|
|
/*
|
|
* Meta node if not all free
|
|
*/
|
|
int i;
|
|
int next_skip;
|
|
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("%*.*s(0x%06x,%d) Submap avail=%d big=%d {\n",
|
|
TABME,
|
|
blk,
|
|
radix,
|
|
(int)meta.u.bmu_avail,
|
|
meta.bm_bighint
|
|
);
|
|
}
|
|
|
|
radix >>= BLIST_META_RADIX_SHIFT;
|
|
next_skip = skip >> BLIST_META_RADIX_SHIFT;
|
|
|
|
for (i = 1; i <= skip; i += next_skip) {
|
|
int r;
|
|
daddr_t vcount = (count > radix) ? radix : count;
|
|
|
|
r = scanradix(
|
|
&scan[i],
|
|
blk,
|
|
radix,
|
|
next_skip - 1,
|
|
vcount,
|
|
kd,
|
|
dmmax,
|
|
nswdev,
|
|
swap_ary,
|
|
swap_max,
|
|
tab + 4,
|
|
flags
|
|
);
|
|
if (r < 0)
|
|
break;
|
|
blk += radix;
|
|
}
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("%*.*s}\n", TABME);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static void
|
|
getswapinfo_radix(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags)
|
|
{
|
|
struct blist *swapblist = NULL;
|
|
struct blist blcopy = { 0 };
|
|
|
|
KGET(NL_SWAPBLIST, swapblist);
|
|
|
|
if (swapblist == NULL) {
|
|
if (flags & SWIF_DUMP_TREE)
|
|
printf("radix tree: NULL - no swap in system\n");
|
|
return;
|
|
}
|
|
|
|
KGET2(swapblist, &blcopy, sizeof(blcopy), "*swapblist");
|
|
|
|
if (flags & SWIF_DUMP_TREE) {
|
|
printf("radix tree: %d/%d/%d blocks, %dK wired\n",
|
|
blcopy.bl_free,
|
|
blcopy.bl_blocks,
|
|
blcopy.bl_radix,
|
|
(blcopy.bl_rootblks * sizeof(blmeta_t) + 1023)/
|
|
1024
|
|
);
|
|
}
|
|
scanradix(
|
|
blcopy.bl_root,
|
|
0,
|
|
blcopy.bl_radix,
|
|
blcopy.bl_skip,
|
|
blcopy.bl_rootblks,
|
|
kd,
|
|
dmmax,
|
|
nswdev,
|
|
swap_ary,
|
|
swap_max,
|
|
0,
|
|
flags
|
|
);
|
|
}
|