linux-kernel - Re: Why is kslowd accumulating so much CPU time?

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Message-ID: <18402.1276625268@redhat.com>
Date:	Tue, 15 Jun 2010 19:07:48 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andy Whitcroft <apw@...onical.com>
Cc:	dhowells@...hat.com, tytso@....edu,
	Dave Airlie <airlied@...il.com>,
	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Why is kslowd accumulating so much CPU time?

Andy Whitcroft <apw@...onical.com> wrote:

> I am seeing crunchy cursor behavior on boot on Ubuntu Lucid user space
> with the 2.6.35-rc3 kernel as well.  It pretty much always does that
> on boot, and often later as well.  Right now I have four of these
> chaps each consuming 9% of a CPU.  Though they definatly come and go.
> Very odd:
> 
>   938 root      15  -5     0    0    0 S    9  0.0   1:00.90 kslowd001
>  1048 root      15  -5     0    0    0 S    9  0.0   1:01.12 kslowd002
>   937 root      15  -5     0    0    0 S    8  0.0   1:00.92 kslowd000
>  1544 root      15  -5     0    0    0 D    8  0.0   1:00.55 kslowd003

Can you see what they're doing?

	watch -n0 cat /sys/kernel/debug/slow_work/runqueue

David
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