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swapoff(8): add -f flag

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to force swapout by ignoring the heuristic that calculates amount of
allocated memory against total of RAM plus remaining swap.

Reviewed by:	markj
Discussed with:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D33165
This commit is contained in:
Konstantin Belousov 2021-11-29 18:30:09 +02:00
parent 79d650f262
commit 1aa249c935
2 changed files with 29 additions and 10 deletions
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16
sbin/swapon/swapon.8
View file

@ -28,7 +28,7 @@
.\" @(#)swapon.8 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
.Dd May 19, 2020
.Dd November 29, 2021
.Dt SWAPON 8
.Os
.Sh NAME
@ -42,9 +42,9 @@
.Nm swapoff
.Oo Fl F Ar fstab
.Oc
.Fl aLq | Ar
.Fl afLq | Ar
.Nm swapctl
.Op Fl AghklmsU
.Op Fl AfghklmsU
.Oo
.Fl a Ar
|
@ -125,8 +125,14 @@ informational messages will not be
written to standard output when a swap device is removed.
Note that
.Nm swapoff
will fail and refuse to remove a swap device if there is insufficient
VM (memory + remaining swap devices) to run the system.
will fail and refuse to remove a swap device if a very conservative
check does not conclude that there is sufficient VM (memory +
remaining swap devices) to run the system.
The
.Fl f
option turns off this check, which could deadlock the system
if there is insufficient swap space remaining.
.Pp
The
.Nm swapoff
utility

23
sbin/swapon/swapon.c
View file

@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <vm/vm_param.h>
#include <vm/swap_pager.h>
#include <err.h>
#include <errno.h>
@ -78,7 +79,7 @@ static int run_cmd(int *, const char *, ...) __printflike(2, 3);
static enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
static int Eflag, qflag;
static int Eflag, fflag, qflag;
int
main(int argc, char **argv)
@ -101,7 +102,7 @@ main(int argc, char **argv)
doall = 0;
etc_fstab = NULL;
while ((ch = getopt(argc, argv, "AadEghklLmqsUF:")) != -1) {
while ((ch = getopt(argc, argv, "AadEfghklLmqsUF:")) != -1) {
switch(ch) {
case 'A':
if (which_prog == SWAPCTL) {
@ -128,6 +129,12 @@ main(int argc, char **argv)
else
usage();
break;
case 'f':
if (which_prog == SWAPOFF)
fflag = 1;
else
usage();
break;
case 'g':
hflag = 'G';
break;
@ -782,12 +789,18 @@ swapon_trim(const char *name)
static const char *
swap_on_off_sfile(const char *name, int doingall)
{
struct swapoff_new_args sa;
int error;
if (which_prog == SWAPON)
error = Eflag ? swapon_trim(name) : swapon(name);
else /* SWAPOFF */
error = swapoff(name);
else { /* SWAPOFF */
bzero(&sa, sizeof(sa));
sa.name = name;
if (fflag)
sa.flags |= SWAPOFF_FORCE;
error = swapoff((const char *)&sa);
}
if (error == -1) {
switch (errno) {
@ -820,7 +833,7 @@ usage(void)
fprintf(stderr, "[-F fstab] -aLq | [-E] file ...\n");
break;
case SWAPOFF:
fprintf(stderr, "[-F fstab] -aLq | file ...\n");
fprintf(stderr, "[-F fstab] -afLq | file ...\n");
break;
case SWAPCTL:
fprintf(stderr, "[-AghklmsU] [-a file ... | -d file ...]\n");