Re: [RFC PATCH 2/3 v2] perf: Implement Nehalem uncore pmu

[Andi Kleen]

> Yep, I see no reason to dis-allow sampling. Sure its hard to make sense
> of it, but since there are people who offline all but one cpu of a
> package, 

Assuming they don't have any active PCI devices either.

> I bet there are people who will run just one task on a package
> as well.

In that case the sampling has a 1/NUM-CPU-THREADS-IN-PACKAGE chance
to report the right task (or actually somewhat less because the measurement 
skew for uncore is much higher than for normal events)

Really for per core measurements using the OFFCORE events is much better.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
--
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/