term% cat index.txt SWAP(8) System Manager's Manual SWAP(8)
NAME
swap - establish a swap file
SYNOPSIS
swap file
DESCRIPTION
Swap establishes a file for the system to swap on. If file is an ex‐
isting file, it is used for system swap. If it does not exist, a new
file is created. If file is a directory, a unique file is created in
that directory on which to swap. The environment variable swap is set
to the full name of the resulting file. The number of blocks available
in the file or device must be at least the number of swap blocks con‐
figured at system boot time.
If a swap channel has already been set and no blocks are currently
valid in the file the old file will be closed and then replaced. If any
blocks are valid on the device an error is returned instead.
SOURCE
/sys/src/cmd/swap.c
BUGS
Swapping to a file served by a local user-level process, such as
kfs(4), will lead to deadlock if the process isn't made non-swappable
(see the noswap ctl-message in proc(3)).
SEE ALSO
proc(3)
SWAP(8)