linux-kernel - Re: 3.14-rc2 XFS backtrace because irqs

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Message-ID: <20140214160123.GA28125@redhat.com>
Date:	Fri, 14 Feb 2014 11:01:23 -0500
From:	Dave Jones <davej@...hat.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eric Sandeen <sandeen@...deen.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: 3.14-rc2 XFS backtrace because irqs_disabled.

On Fri, Feb 14, 2014 at 11:24:27AM +1100, Dave Chinner wrote:
 
 > > I can fix this one easily - we already have a workqueue for doing
 > > async log pushes (will split the stack between xlog_cil_force_lsn
 > > and xlog_cil_push), but the reason we haven't used it for synchronous
 > > log forces is that screws up fsync performance on CFQ. We don't
 > > recommend CFQ with XFS anyway, so I think I'll make this change
 > > anyway.
 > 
 > Dave, the patch below should chop off the stack usage from
 > xfs_log_force_lsn() issuing IO by deferring it to the CIL workqueue.
 > Can you given this a run?

Looks like it's survived an overnight run..

	Dave
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