From mboxrd@z Thu Jan 1 00:00:00 1970 From: Theodore Ts'o Subject: Re: ext4 unknown problem Date: Wed, 1 Aug 2012 12:18:24 -0400 Message-ID: <20120801161824.GB27989@thunk.org> References: <927688619.179881343809505627.JavaMail.root@shiva> <371434290.179901343809839004.JavaMail.root@shiva> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org, info To: LuVar Return-path: Received: from li9-11.members.linode.com ([67.18.176.11]:42551 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750737Ab2HAQSa (ORCPT ); Wed, 1 Aug 2012 12:18:30 -0400 Content-Disposition: inline In-Reply-To: <371434290.179901343809839004.JavaMail.root@shiva> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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