linux-ext4 - Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ

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Message-ID: <x49hbknfeck.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 28 Jun 2010 09:58:51 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Tao Ma <tao.ma@...cle.com>
Cc:	axboe@...nel.dk, vgoyal@...hat.com, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, Joel Becker <joel.becker@...cle.com>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	"ocfs2-devel\@oss.oracle.com" <ocfs2-devel@....oracle.com>
Subject: Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ

Tao Ma <tao.ma@...cle.com> writes:

> btw, I also met with a NULL pointer deference in cfq_yield. I have
> attached the null.log also. This seems to be related to the previous
> deadlock and happens when I try to remount the same volume after
> reboot and ocfs2 try to do some recovery.

Since I can't reproduce your binary kernel even with your .config, could
you send me the disassembly of the cfq_yield function from your vmlinux
binary?

Thanks!
Jeff
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