linux-kernel - Re: [RFC 1/3] mmiotrace full patch, preview 3

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Message-ID: <20080429234021.071f7948@daedalus.pq.iki.fi>
Date:	Tue, 29 Apr 2008 23:40:21 +0300
From:	Pekka Paalanen <pq@....fi>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Pavel Roskin <proski@....org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC 1/3] mmiotrace full patch, preview 3

On Mon, 28 Apr 2008 21:45:04 +0300
Pekka Paalanen <pq@....fi> wrote:

> The current state is that mmiotrace seems to work fine, also on SMP,
> but on SMP there's a chance to miss events due to CPUs racing. At last
> the log produced via ftrace framework is up-to-spec. Inserting user
> comments (markers in mmiotrace-parlance) into the log is not yet
> supported. All in all, after some more testing on my part, IMHO this
> is in a mergeable state.

Ok, looks like I won't be able to do more testing than what I did today.
The sched-devel/latest tree has changes that break the out-of-tree DRM,
so I cannot test with Nouveau, and most likely the proprietary driver
will not work either. A very nice test would be to enable mmiotracing
as early in boot as convinient, but I don't know how to achieve that
with the ftrace framework.

I did notice two bugs in mmiotrace while looking at ioremap.c, so
I will follow here with three patches.

Tested with the patches and sched-devel/latest of
Tue, 29 Apr 2008 11:47:55 +0000
using testmmiotrace.ko and things looked fine.

Thanks.

-- 
Pekka Paalanen
http://www.iki.fi/pq/
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