Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()

[Andrew Morton]

Andi Kleen <ak@xxxxxxx> wrote:
>
> On Friday 02 September 2005 04:08, Andrew Morton wrote:
> 
> > I suppose I'll queue it up in -mm for a while, although I'm a bit dubious
> > about the whole idea...  We'll gain some and we'll lose some - how do we
> > know it's a net gain?
> 
> I suspect it'll gain more than it loses. The only case where it might 
> not gain is immediately someone reading the data from the page cache again
> after the write.

That's a pretty common case - temporary files.

> But I suppose that's far less frequent than writing the data.

yup.

Hiro, could you please send through a summary of the performance testing
results sometime?  Runtimes rather than oprofile output?
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