linux-kernel - Re: [vm] writing to UDF DVD+RW (/dev/sr0) while under memory pressure: box ==> doorstop

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Date:	Thu, 10 Jan 2008 05:21:25 +0100
From:	Mike Galbraith <efault@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	bfennema@...con.csc.calpoly.edu
Subject: Re: [vm] writing to UDF DVD+RW (/dev/sr0) while under memory
	pressure: box ==> doorstop

On Wed, 2008-01-09 at 15:01 -0800, Andrew Morton wrote:

> So are you saying that the fs throughput is unaltered by this change,
> but that the side-effects which your workload has on the overall
> machine are lessened?

Yes.  UDF IO is still a slow trickle, but the box is now fine under VM
stress, vs all allocating tasks eventually getting nailed (essentially
forever) by iprune_mutex previously.

	-Mike

P.S.  I would submit one-liner for VFS part, but it's useless without
UDF part, and nobody is hitting what I ran into while testing alleged
scsi_done regression thingy anyway.  cc added.

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