linux-kernel - Killable stat/readdir

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Date:	Wed, 16 Apr 2008 06:59:21 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Bart Van Assche <bart.vanassche@...il.com>,
	Roland Dreier <rdreier@...co.com>,
	Ingo Oeser <ioe-lkml@...eria.de>,
	Daniel Walker <dwalker@...sta.com>,
	linux-kernel@...r.kernel.org
Subject: Killable stat/readdir

On Wed, Apr 16, 2008 at 02:50:34PM +0200, Andi Kleen wrote:
> killable stat and readdir would be even more important I would say.
> 
> When sync/fsync takes too long it's typically just a kernel bug
> of some sort (like that long running MM starvation issue that stalls
> writes on some kinds of background activity) that should be really just
> fixed.
> 
> But handling down network servers which hit stat/readdir etc. is
> a real situation not explained by a bug.
> 
> For example a standard situation that hits me regularly is that
> I save something in firefox on a different server and then later
> turn that machine off. Then next time I try to save something
> in firefox it first blocks forever in stat()ing that down directory.

I think that's fixed now.  Can you check with 2.6.25-rc1 or later?
If it's unkillable, can you let me know the wchan for that process?

-- 
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"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
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