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

[Christoph Lameter]

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).

--
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/