linux-kernel - Re: A lot of [ext4-dio-unwrit] threads around

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Date:	Mon, 7 Feb 2011 13:05:24 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: A lot of [ext4-dio-unwrit] threads around

On Mon, Feb 07, 2011 at 07:09:26PM +0200, Ozan Çağlayan wrote:
> 
> This is 2.6.35.11 on a 24-core HP Proliant server with 8 mounted
> ext4 filesystems. There are 7 LXC containers which does heavy
> compiling workload during the day.
> 
> Uptime is 3 days and currently there are 216 ext4-dio-unwrit threads
> in ps aux output? Is it normal or a symptom of a problem?

It's normal; the workqueues are created statically at mount time, one
per cpu per file system.  There are some plans in train for a more
efficient way of dealing with workqueues in general on systems with
large numbers of CPU's, but for 2.6.35, yes, that's normal.

      	      	 	    		- Ted
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