linux-kernel - RE: XFS memory allocation deadlock in 2.6.38

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Date:	Tue, 29 Mar 2011 21:32:06 -0400
From:	Sean Noonan <Sean.Noonan@...sigma.com>
To:	'Dave Chinner' <david@...morbit.com>
CC:	'Christoph Hellwig' <hch@...radead.org>,
	'Michel Lespinasse' <walken@...gle.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	Martin Bligh <Martin.Bligh@...sigma.com>,
	Trammell Hudson <Trammell.Hudson@...sigma.com>,
	Christos Zoulas <Christos.Zoulas@...sigma.com>,
	"'linux-xfs@....sgi.com'" <linux-xfs@....sgi.com>,
	Stephen Degler <Stephen.Degler@...sigma.com>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>
Subject: RE: XFS memory allocation deadlock in 2.6.38

> Ok, so that looks like root cause of the problem. can you try the
> patch below to see if it fixes the problem (without any other
> patches applied or reverted).

It looks like this does fix the deadlock problem.  However, it appears to come at the price of significantly higher mmap startup costs.  

# ./vmtest /xfs/hugefile.dat $(( 16 * 1024 * 1024 * 1024 ))
/xfs/d-1/hugefile.dat: mapped 17179869184 bytes in 324387362198 ticks

Sean
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