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Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()
- From: Andi Kleen <ak@xxxxxxx>
- Date: 15 Aug 2005 17:02:27 +0200
- References: <20050815121555.29159.qmail@science.horizon.com.suse.lists.linux.kernel> <1124108702.3228.33.camel@laptopd505.fenrus.org.suse.lists.linux.kernel>
- User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3
Arjan van de Ven <arjan@xxxxxxxxxxxxx> writes:
> On Mon, 2005-08-15 at 08:15 -0400, linux@xxxxxxxxxxx wrote:
> > Actually, is there any place *other* than write() to the page cache that
> > warrants a non-temporal store? Network sockets with scatter/gather and
> > hardware checksum, maybe?
>
> afaik those use zero copy already, eg straight pagecache copy.
Only if you use sendfile(). And the normal write path uses csum_copy_*
-Andi
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