linux-kernel - Re: [PATCH 0/3] ARM Coresight: Enhance ETM tracing control

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Message-ID: <20131204070442.GA31665@kroah.com>
Date:	Tue, 3 Dec 2013 23:04:42 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Adrien Vergé <adrienverge@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Will Deacon <will.deacon@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH 0/3] ARM Coresight: Enhance ETM tracing control

On Tue, Dec 03, 2013 at 11:39:21PM -0500, Adrien Vergé wrote:
> Usage of ETM tracing facility is currently very limited: user can
> only start/stop tracing. This set of patches enables management of
> address combinations and PIDs that trigger tracing.
> 
> ETM management was done via sysfs entries (trace_info,
> trace_running...), this code adds trace_addrrange and trace_pid to
> let the user read/write custom values.

I have lots to say about this from a sysfs point of view, but first, why
is it in sysfs at all?  Shouldn't all of this be in debugfs?

greg k-h
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