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

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Message-ID: <alpine.DEB.2.02.1210181339510.28924@vincent-weaver-1.um.maine.edu>
Date:	Thu, 18 Oct 2012 13:54:47 -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:

> > 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.
> 
> Ok. As long as it's all identical I'd still be inclined to 
> include it in v3.7, to reduce version skew. If the v3.7-rc1 
> kernel won't even boot it's not like we'll be able to further 
> regress it.

yes, it definitely shouldn't cause any regressions, and in fact the
version in 3.7-rc1 might not work properly without patch2 in this 
set applied due to the cpuc->enabled problem that it took us a while to 
track down.

I looked into getting a 3.7 kernel up and going on the KNC board, but
the diff between Intel's release and stock 2.6.34.11 has 70k 
lines.  Much of that is kdb, but there's also a lot of low-level 
changes too, some of it due to the fact that KNC is 64-bit x86 but has no 
support for SSE (so you need to handle that properly or none of your 
userspace will run).

Thanks,

Vince Weaver
vincent.weaver@...ne.edu
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