linux-kernel - Re: Some FTRACE related question

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Message-Id: <200811221359.24808.rjw@sisk.pl>
Date:	Sat, 22 Nov 2008 13:59:24 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Peter Teoh" <htmldeveloper@...il.com>
Cc:	"Steven Rostedt" <srostedt@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Some FTRACE related question

On Saturday, 22 of November 2008, Peter Teoh wrote:
> Q1:   how to use ftrace to ftrace itself?   (i would like to see some
> ftrace-triggered flow)   In view of the following patch:
> 
> http://linux.derkeiler.com/Mailing-Lists/Kernel/2008-11/msg03745.html
> 
> Is it to prevent this from being possible?

I can't really answer this, sorry.

> Q2:   how to ftrace s2ram and resume?   I attempted to do it, but the
> trace output is always filled with "resume" related functions when it
> started up, which is only logical.

The tracing is disabled during suspend/resume, so you can't.

Thanks,
Rafael
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