Plan 9 - man page for swap (plan9 section 8)
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swap - establish a swap file
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 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 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.
Swapping to a file served by a user-level process, such as kfs(4), can lead to deadlock;
use raw devices or remote files instead.
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