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

From: Vince Weaver
Date: Thu Oct 18 2012 - 13:53:59 EST

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 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).


Vince Weaver
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