linux-kernel - Re: Processes spinning forever, apparently in lock_timer

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Message-Id: <20070921033336.c327ffd9.akpm@linux-foundation.org>
Date:	Fri, 21 Sep 2007 03:33:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	richard kennedy <richard@....demon.co.uk>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	Matthias Hensler <matthias@...se.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Processes spinning forever, apparently in lock_timer_base()?

On Fri, 21 Sep 2007 11:25:41 +0100 richard kennedy <richard@....demon.co.uk> wrote:

> > That's all a bit crappy if the wrong races happen and some other task is
> > somehow exceeding the dirty limits each time this task polls them.  Seems
> > unlikely that such a condition would persist forever.
> > 
> > So the question is, why do we have large amounts of dirty pages for one
> > disk which appear to be sitting there not getting written?
> 
> The lockup I'm seeing intermittently occurs when I have 2+ tasks copying
> large files (1Gb+) on sda & a small read-mainly mysql db app running on
> sdb. The lockup seems to happen just after the copies finish -- there
> are lots of dirty pages but nothing left to write them until kupdate
> gets round to it. 

Then what happens?  The system recovers?
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