Re: [PATCH 2/5] powernow-k8: Add core performance boost support

[Borislav Petkov]

From: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, Mar 23, 2010 at 03:47:57PM +0100

> > > If it's a percpu var, isn't it local anyway?
> > 
> > I meant driver-local. So that I don't have to deref even the per_cpu var
> > and thus save some cycles.
> 
> Well, it doesn't seem to be used in any hot path (and if it were, using a
> per-cpu var was better anyway, because of no contention etc.). If it really
> saves some cycles, I'm more than fine with keeping it; still, informing the
> user in /proc/cpuinfo seems like a sensible thing to do.

No, the idea was to do the local caching _in addition_ to advertising it
over /proc/cpuinfo. Let's see what the x86 maintainers think though...

-- 
Regards/Gruss,
Boris.

--
Advanced Micro Devices, Inc.
Operating Systems Research Center
--
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/