Re: [PATCH 0/3] perf_event: enable overflow interrupts on KNC

From: Vince Weaver
Date: Wed Oct 17 2012 - 16:23:08 EST

On Wed, 17 Oct 2012, Ingo Molnar wrote:

> How well tested is this on real hardware and how robust is the
> hardware with this? Since it's a new PMU driver for v3.7, and if
> these are reasonably well tested, then we could send these to
> Linus via perf/urgent, so that they don't miss and have to wait
> all the way to v3.8.

You probably won't like this answer.

The patches have been tested against the 2.6.34 kernel that Intel provides
for KNC (found here )

perf stat, perf record, and PAPI have all been tested and work.

The patches I've sent are the 2.6.34 ones forward ported to the 3.7-rc1
kernel. I haven't been able to run a 3.7-rc kernel on the KNC board,
because there are other patches to mainline needed to get KNC running and
they'd all have to be forward-ported from 2.6.34.

Since the knc pmu driver closely models the p6 one, it was straightforward
to use it as a basis for the forward port. Everything _should_ work but
I've only compile tested.

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