Messages in this thread | | | Date | Mon, 31 Dec 2001 10:50:15 -0200 (BRST) | From | Rik van Riel <> | Subject | Re: [patch] Prefetching file_read_actor() |
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On Mon, 31 Dec 2001, Dave Jones wrote:
> diff -urN --exclude-from=/home/davej/.exclude linux-2.5.2-pre5/mm/filemap.c linux-2.5/mm/filemap.c > --- linux-2.5.2-pre5/mm/filemap.c Sun Dec 16 23:21:24 2001 > +++ linux-2.5/mm/filemap.c Mon Dec 31 03:22:51 2001 > @@ -1570,6 +1570,15 @@ > size = count; > > kaddr = kmap(page); > + > + if (size > 128) { > + int i; > + for(i=0; i<size; i+=64) { > + prefetch (kaddr+offset); > + prefetch (kaddr+offset+(L1_CACHE_BYTES*2));
Neat piece of deep magic, please document it ;)
Rik -- Shortwave goes a long way: irc.starchat.net #swl
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