linux-kernel - Re: [RFC PATCH 00/20] Coresight integration with perf

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Date:	Wed, 30 Sep 2015 13:18:03 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>,
	gregkh@...uxfoundation.org, a.p.zijlstra@...llo.nl,
	acme@...nel.org, mingo@...hat.com, corbet@....net
Cc:	adrian.hunter@...el.com, zhang.chunyan@...aro.org,
	mike.leach@....com, tor@...com, al.grant@....com,
	pawel.moll@....com, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 00/20] Coresight integration with perf

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

> This patchset aims to integrate configuration and control of
> the Coresight tracers with the perf sub-system.
>
> The goal is to use PMUs to represent tracers and the auxiliary
> buffer enhancement to collect processor traces.  As such a lot
> of work is done to move the current Coresight sysFS oriented
> configuration and control commands to perf's AUX API.

Another general question: is there anything that prevents a sysfs user
from changing ETM/ETB configuration while it's used by a perf event? I
couldn't find any code in this patchset that would implement such
exclusivity.

Thanks,
--
Alex
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