swap man page on Plan9

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SWAP(8)								       SWAP(8)

NAME
       swap - establish a swap file

SYNOPSIS
       swap file

DESCRIPTION
       Swap  establishes  a file or device for the system to swap on.  If file
       is a device, the device is used directly; if a directory, a unique file
       is  created  in that directory on which to swap.	 The environment vari‐
       able 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 configured 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), can lead to deadlock; use raw devices or remote files instead.

								       SWAP(8)
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