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NetBSD 6.1.5 - man page for altmem (netbsd section 4)

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ALTMEM(4)			   BSD Kernel Interfaces Manual 			ALTMEM(4)

NAME
     altmem -- Alternative memory disk driver

SYNOPSIS
     altmem* at altmemdev?

DESCRIPTION
     The altmem driver enables use of physical memory that is normally inaccessible by the
     machine-dependent pmap(9) as a swap device.

     When an alternative memory disk device is present, this device is generally preferred to
     hard disk-based swap space.  See the swapctl(8) and fstab(5) man pages for instructions on
     how to assign priorities to swap devices.

FILES
     /dev/altmem??   block mode alternative memory disk devices.
     /dev/raltmem??  raw mode alternative memory disk devices.

SEE ALSO
     md(4), fstab(5), swapctl(8)

HISTORY
     The altmem device driver appeared in NetBSD 6.0.

AUTHORS
     Jared D. McNeill <jmcneill@NetBSD.org>

BSD					  March 11, 2009				      BSD
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