Re: [RFC 00/15] x86_64: Optimize percpu accesses

[H. Peter Anvin]

Christoph Lameter wrote:
> Jeremy Fitzhardinge wrote:
>
> > Eh?  Yes they will.  That's the whole point of making the pda a percpu
> > variable itself.  You can use %gs:<small> to get to the pda, and
> > %gs:<larger> to get to percpu variables.  Converting pda->percpu will
> > just have the effect of increasing the %gs offset into the percpu space.
>
> Right that is what this patchset does.
>
> > This project isn't interesting to me unless per-cpu variables are
> > directly accessible off %gs.
>
> Maybe I misunderstood but it seems that you proposed to convert individual members of the pda structure (which uses GS) to per cpu variables (which without this patchset cannot use GS).

I don't understand the "individual members" requirement here.

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