lkml.org 
[lkml]   [2001]   [Dec]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch] Prefetching file_read_actor()
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

http://www.surriel.com/ http://distro.conectiva.com/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:14    [W:0.076 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site