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

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Date:	Tue, 29 Jun 2010 07:16:10 +0800
From:	Tao Ma <tao.ma@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	axboe@...nel.dk, vgoyal@...hat.com, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	"ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>
Subject: Re: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using
 CFQ

Jeff Moyer wrote:
> 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?
>   
no problem. I have attached it.
btw, if you have any debug patch, I am happy to run it to make the 
problem more clear to you.

Regards,
Tao

View attachment "cfq_yield.txt" of type "text/plain" (5070 bytes)