linux-kernel - Re: [PATCH v2 2/4] perf/x86: Fix data source decoding for Skylake

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Message-ID: <20170608202230.GF8337@worktop.programming.kicks-ass.net>
Date:   Thu, 8 Jun 2017 22:22:30 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...nel.org>, Andi Kleen <ak@...ux.intel.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2/4] perf/x86: Fix data source decoding for Skylake

On Thu, Jun 08, 2017 at 01:10:07PM -0700, Andi Kleen wrote:
> Note that Skylake cannot fill it in, it doesn't report the hops.
> And for the old parts the existing bits work. So I don't think
> there's a motivation to add a new hops field, unless some other
> architecture needs it.

PowerPC is currently using the REM2 stuff, I added the people who wrote
that code to Cc in the hope they would help by explaining their platform
capabilities.