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DateMon, 31 Dec 2001 20:31:22 +0000
FromDave Jones <>
SubjectRe: [patch] Prefetching file_read_actor()
On Mon, Dec 31, 2001 at 11:58:27AM +0100, Manfred Spraul wrote:
 > > What happens if a prefetch spills over the end of the page and
 > > faults?

 > Doesn't hurt, prefetch instruction never cause page faults.
 > BUT: Prefetch doesn't preload the TLB. If the TLB entry for the kmap is
 > not in the TLB, all prefetch instructions are treated as nops.(on pIII).

 Wasn't this the reason for the voodoo workaround we have in
 the mmx version of fast_copy_page() ?

 Dave.

-- 
Dave Jones.                    http://www.codemonkey.org.uk
SuSE Labs.
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