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

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Message-ID: <20100617132554.GA8409@elliptictech.com>
Date:	Thu, 17 Jun 2010 09:25:54 -0400
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Andy Whitcroft <apw@...onical.com>
Cc:	David Howells <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?

On 15:55 Wed 16 Jun     , Andy Whitcroft wrote:
> On Wed, Jun 16, 2010 at 3:36 PM, Nick Bowler <nbowler@...iptictech.com> wrote:
> > The threads sometimes get pegged immediately after booting the system,
> > sometimes it can last an hour or more before showing any problems.
> > Unfortunately, this is making bisection essentially impossible.
> >
> > This seems to have been introduced somewhere between 2.6.35-rc1 and
> 
> I suspect this is introduced by the commit which pulled polling of DRM
> connectors into the core.

OK.  From this hint I looked at the log between -rc1 and -rc2 and found
commit fbf81762e385d ("drm/kms: disable/enable poll around switcheroo
on/off").

Reverting this commit brings everything back to normal.

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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