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SubjectRe: Address spaces on a i386 - Getting Confused
   Date: Tue, 30 Mar 1999 22:26:34 +1000
From: Richard Gooch <rgooch@atnf.csiro.au>

He should be able to allocate kernel pages and mmap() them to user
space. Then he can DMA into the pages and wake up the user process
when it's done.

This would work, but only if it is mlock'd (could be done by the
kernel, just set the appropriate vm_flags during the mmap) else the
swapper can toss it to disk at any time.

Later,
David S. Miller
davem@redhat.com

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