On Sun, 13 Jan 2008, Nick Piggin wrote:
>
> OK, you have to read to the 3rd paragraph.
That one doesn't actually say what the point is either. It just claims
that there *is* a point that isn't actually explained or mentioned
further.
> Well the immediate improvement from this actual patch is just that
> it gives better and smaller code for vm_normal_page (even if you
> discount the debug checks in the existing code).
It does no such thing, except for the slow-path that doesn't matter.
So it may optimize the slow-path (PFNMAP/MIXMAP), but the real path stays
exactly the same from a code generation standpoint (just checking a
different bit, afaik).
If those pte_special bits are required for unexplained lockless
get_user_pages, is this going to get EVEN WORSE when s390 (again) cannot
do it?
Linus
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