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

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Date:	Wed, 17 Oct 2012 16:24:02 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Ingo Molnar <mingo@...nel.org>
cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	eranian@...il.com,
	"Meadows, Lawrence F" <lawrence.f.meadows@...el.com>
Subject: Re: [PATCH 0/3] perf_event: enable overflow interrupts on KNC

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 http://software.intel.com/en-us/forums/topic/278102 )

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.

Vince
vincent.weaver@...ne.edu
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