linux-kernel - Re: [RFC PATCH 00/11] drm/i915: Expose OA metrics via perf PMU

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Message-ID: <20150508162452.GR27504@twins.programming.kicks-ass.net>
Date:	Fri, 8 May 2015 18:24:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Bragg <robert@...bynine.org>
Cc:	intel-gfx@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-api@...r.kernel.org
Subject: Re: [RFC PATCH 00/11] drm/i915: Expose OA metrics via perf PMU

On Thu, May 07, 2015 at 03:15:43PM +0100, Robert Bragg wrote:

> I've changed the uapi for configuring the i915_oa specific attributes
> when calling perf_event_open(2) whereby instead of cramming lots of
> bitfields into the perf_event_attr config members, I'm now
> daisy-chaining a drm_i915_oa_event_attr_t structure off of a single
> config member that's extensible and validated in the same way as the
> perf_event_attr struct. I've found this much nicer to work with while
> being neatly extensible too.

This worries me a bit.. is there more background for this?
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