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SubjectRe: [RFC][PATCHSET] mremap/mmap mess
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From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Date: Tue, 8 Dec 2009 13:03:30 +0000 (GMT)
> That would impose some (unacceptable?) limits, and require some funny
> code to migrate the pages over to the new mm later (instead of
> relocating within the new mm as we do now).

I think this approach would create new failure cases that don't exist
now. Whether that's acceptable or not is another issue.

The forced page table move, and TLB+cache flush that goes along with
that, for every single compat task we get now on the other hand is not
acceptable :-)

I also think this page table move overhead is worse than the
non-swapability added by Al's approach.


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