Re: [patch] Prefetching file_read_actor()

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Mon Dec 31 2001 - 08:00:21 EST

> > +
> > + if (size > 128) {
> > + int i;
> > + for(i=0; i<size; i+=64) {
> > + prefetch (kaddr+offset);
> > + prefetch (kaddr+offset+(L1_CACHE_BYTES*2));
> > + }
> > + }
> > +

Thats almost certainly wrong for most processors. It might work on the PIII
but I wouldnt trust the right results on others. Fix copy_to_user to
have a prefetching version if appropriate

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