linux-ext4 - Re: ext4 unknown problem

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Message-ID: <20120801161824.GB27989@thunk.org>
Date:	Wed, 1 Aug 2012 12:18:24 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	LuVar <luvar@...intext.sk>
Cc:	linux-ext4@...r.kernel.org, info <info@...intext.sk>
Subject: Re: ext4 unknown problem

On Wed, Aug 01, 2012 at 09:30:39AM +0100, LuVar wrote:
> 
> File does not exist... (if there is something to turn on in kernel config, I could do that for future...)

The options you need to enable to use ftrace are:

    CONFIG_FUNCTION_TRACER
    CONFIG_FUNCTION_GRAPH_TRACER
    CONFIG_STACK_TRACER
    CONFIG_DYNAMIC_FTRACE    

There's a pretty good tutorial here: http://lwn.net/Articles/365835/

If you are willing to compile your own kernel, can you try going to
the latest 3.5 kernel and see if the problem still affects you there?

    	       	      	      	 - Ted
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