linux-kernel - Re: [PATCH 1/2] mmiotrace: fix buffer overrun detection

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Message-ID: <20081123193413.GB2794@elte.hu>
Date:	Sun, 23 Nov 2008 20:34:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Paalanen <pq@....fi>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, fweisbec@...il.com
Subject: Re: [PATCH 1/2] mmiotrace: fix buffer overrun detection


* Pekka Paalanen <pq@....fi> wrote:

> From d5d72f3515ba3abffa317b985d7597718a024841 Mon Sep 17 00:00:00 2001
> From: Pekka Paalanen <pq@....fi>
> Date: Sun, 23 Nov 2008 19:18:18 +0200
> Subject: [PATCH] mmiotrace: fix buffer overrun detection
> 
> When ftrace framework moved to use the ring buffer facility, the buffer
> overrun detection was broken after 2.6.27 by commit
> 
> commit 3928a8a2d98081d1bc3c0a84a2d70e29b90ecf1c
> Author: Steven Rostedt <rostedt@...dmis.org>
> Date:   Mon Sep 29 23:02:41 2008 -0400
> 
>     ftrace: make work with new ring buffer
> 
>     This patch ports ftrace over to the new ring buffer.
> 
> The detection is now fixed by using the ring buffer API.
> 
> When mmiotrace detects a buffer overrun, it will report the number of
> lost events. People reading an mmiotrace log must know if something was
> missed, otherwise the data may not make sense.
> 
> Signed-off-by: Pekka Paalanen <pq@....fi>
> ---
> 
> Ingo, could these two patches still make it into .28?

Sure - applied them to tip/tracing/urgent:

  fb91ee6: tracing, doc: update mmiotrace documentation
  7ee1768: x86, mmiotrace: fix buffer overrun detection

Does this make mmiotrace fully functional in .28 ?

	Ingo
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