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Add sysctl to query amount of swap space free

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PR:		kern/166780
Submitted by:	Radim Kolar <hsn@sendmail.cz>
Approved by:	cperciva
MFC after:	1 week
This commit is contained in:
eadler 2012-06-01 04:42:52 +00:00
parent 9463606153
commit 01b578179f
1 changed files with 15 additions and 0 deletions
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15
sys/vm/swap_pager.c
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@ -2692,3 +2692,18 @@ swaponvp(struct thread *td, struct vnode *vp, u_long nblks)
NODEV);
return (0);
}
static int
sysctl_vm_swap_free(SYSCTL_HANDLER_ARGS) {
int swap_free, used;
int total;
swap_pager_status(&total, &used);
swap_free = (total - used) * PAGE_SIZE;
return SYSCTL_OUT(req, &swap_free, sizeof(swap_free));
}
SYSCTL_OID(_vm, OID_AUTO, swap_free, CTLTYPE_INT|CTLFLAG_RD|CTLFLAG_MPSAFE,
NULL, 0, sysctl_vm_swap_free, "Q",
"Blocks of free swap storage.");