Re: [patch] tlb flush_data: replace per_cpu with an array

Ingo Molnar
2009-01-13T12:14:42Z

* Andi Kleen <andi@firstfloor.org> wrote:

> > > (And was it determined yet, that a cacheline has to be tossed around
> > > as well?)
> >
> > No, that assertion of Andi is wrong.
>
> For the IPI you always have to toss one cache line around to pass the
> information.
>
> Anyways the padding is just to avoid false sharing.

Which is a red herring - the padding was there before the patch, and is
there after the patch as well.

Ingo