linux-kernel - Re: [PATCH V3 5/5] ARM CoreSight: ETM: Add PID control support

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Message-ID: <20140203104641.GB12187@mudshark.cambridge.arm.com>
Date:	Mon, 3 Feb 2014 10:46:41 +0000
From:	Will Deacon <will.deacon@....com>
To:	Adrien Vergé <adrienverge@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Christopher Covington <cov@...eaurora.org>,
	Dirk Behme <dirk.behme@...bosch.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 5/5] ARM CoreSight: ETM: Add PID control support

On Thu, Jan 30, 2014 at 04:11:10PM +0000, Adrien Vergé wrote:
> In the same manner as for enabling tracing, an entry is created in
> sysfs to set the PID that triggers tracing. This change is effective
> only if CONFIG_PID_IN_CONTEXTIDR is set.
> 
> When using PID namespaces, the virtual PID given by the user is
> converted to the globally unique ID (task_pid_nr) that is present
> in the Context ID register.

Hmm, I wonder whether debugfs would be more suitable for this?

Will
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