Re: [PATCH] THP: mremap support and TLB optimization #2

[Andrea Arcangeli <aarcange@redhat.com>]

On Fri, Aug 05, 2011 at 04:25:16PM +0100, Mel Gorman wrote:
> The meaning of the return values of -1, 0, 1 with the caller doing
> 
> if (err)
> ...
> else if (!err)
> 	...
> 
> is tricky to work out. split_huge_page only needs to be called if
> returning 0. Would it be possible to have the split_huge_page called in
> this function? The end of the function would then look like

I'm doing the cleanup but problem is to call split_huge_page in
move_huge_pmd I'd need to call move_huge_pmd even when extent <
HPAGE_PMD_SIZE. That's an unnecessary call... That is the reason of
the tristate.

Alternatively I could call split_huge_page even if move_huge_pmd
returns -1 (so making it return 0) but then it'd be another
unnecessary call.

Not sure anymore if it's worth removing the -1.

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