linux-kernel - Re: [PATCH V6 20/26] perf: changing pmu::setup

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Message-ID: <87egetcbvs.fsf@ashishki-desk.ger.corp.intel.com>
Date:	Fri, 11 Dec 2015 16:12:39 +0200
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>,
	gregkh@...uxfoundation.org
Cc:	zhang.chunyan@...aro.org, mike.leach@....com, tor@...com,
	al.grant@....com, fainelli@...adcom.com,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH V6 20/26] perf: changing pmu::setup_aux() parameter to include event

Mathieu Poirier <mathieu.poirier@...aro.org> writes:

> For Coresight ETMv3/4 tracers the event carries information
> about trace modes such as user or kernel space tracing and
> whether tracing is allowed when operating in secure mode.

Ok, so it looks to me that what you're doing in your setup_aux with the
event, you should rather be doing in pmu::event_init(), which takes
event as a parameter and it even makes more sense semantically, because
that bit is really configuring the parameters of tracing and not
capturing, which setup_aux() is more about. And the above paragraph also
sounds very much like it. Since in Coresight there is a very clear
distinction between trace generation (sources) and capturing (sinks) it
should also be possible to structure the code in such a way that the
former are not as closely tied to the latter. Please correct me if I'm
missing something.

Regards,
--
Alex
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