linux-kernel - Re: Regression from 2.6.36

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Message-Id: <20110415125651.68156745@pobox.sk>
Date:	Fri, 15 Apr 2011 12:56:51 +0200
From:	"azurIt" <azurit@...ox.sk>
To:	"Mel Gorman" <mgorman@...e.de>
Cc:	"Mel Gorman" <mel@....ul.ie>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	"Changli Gao" <xiaosuo@...il.com>,
	"Am?rico Wang" <xiyou.wangcong@...il.com>,
	"Jiri Slaby" <jslaby@...e.cz>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	"Jiri Slaby" <jirislaby@...il.com>
Subject: Re: Regression from 2.6.36


# mount -t debugfs none /sys/kernel/debug
mount: mount point /sys/kernel/debug does not exist

# mkdir /sys/kernel/debug
mkdir: cannot create directory `/sys/kernel/debug': No such file or directory


config file used for testing is here:
http://watchdog.sk/lkml/config


azur


______________________________________________________________
> Od: "Mel Gorman" <mgorman@...e.de>
> Komu: azurIt <azurit@...ox.sk>
> Dátum: 15.04.2011 12:47
> Predmet: Re: Regression from 2.6.36
>
> CC: "Mel Gorman" <mel@....ul.ie>, "Andrew Morton" <akpm@...ux-foundation.org>, "Eric Dumazet" <eric.dumazet@...il.com>, "Changli Gao" <xiaosuo@...il.com>, "Am?rico Wang" <xiyou.wangcong@...il.com>, "Jiri Slaby" <jslaby@...e.cz>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, "Jiri Slaby" <jirislaby@...il.com>
>On Fri, Apr 15, 2011 at 11:59:03AM +0200, azurIt wrote:
>> 
>> Also this new patch is working fine and fixing the problem.
>> 
>> Mel, I cannot run your script:
>> # perl watch-highorder-latency.pl
>> Failed to open /sys/kernel/debug/tracing/set_ftrace_filter for writing at watch-highorder-latency.pl line 17.
>> 
>> # ls -ld /sys/kernel/debug/
>> ls: cannot access /sys/kernel/debug/: No such file or directory
>> 
>
>mount -t debugfs none /sys/kernel/debug
>
>If it still doesn't work, sysfs or the necessary FTRACE options are
>not enabled on your .config. I'll give you a list if that is the case.
>
>Thanks.
>
>-- 
>Mel Gorman
>SUSE Labs
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