linux-kernel - Re: [PATCH v2 4/4] perf/x86/uncore: modularize Intel uncore driver

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Date:	Fri, 25 Apr 2014 15:55:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v2 4/4] perf/x86/uncore: modularize Intel uncore driver

On Fri, Apr 25, 2014 at 09:17:36PM +0800, Yan, Zheng wrote:
> On 04/24/2014 07:27 PM, Peter Zijlstra wrote:
> > On Thu, Apr 24, 2014 at 12:36:01PM +0200, Stephane Eranian wrote:
> >>> Most of hardware specific codes in the Intel uncore driver are for
> >>> SandyBridge/IvyBridge/Haswell. Uncore subsystem in these CPUs are
> >>> similar. One module per CPU type means we have to duplicate lots of
> >>> code. I don't think it's a good idea.
> >>>
> >> Then, at least split nhm_ex from the rest. It is very big.
> > 
> > Aren't the EX parts in general far more complex and different from the
> > EP parts? Or will the SNB/IVB/HSW-EX parts also be similar again? (this
> > would be a good thing).
> 
> SNB/IVB/HSW-EX are almost identical to SNB/IVB/HSW-EP.

Ah, good, sanity prevails!

> NHM/WSM-EX are complete different from SNB/IVB/HSW-EX

Yeah, NHM/WSM-EX are different from pretty much anything.

Where do NHM/WSM-EP fall? I know they're radically different to the EX
parts but are they similar again to the SNB/IVB/HSW EP parts?

If not we'd have 3 groups:

NHM/WSM-EP
NHM/WSM-EX
SNB/IVB/HSW
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