linux-ext4 - Re: [PATCH 09/10] xfstest: add defragmentation stress tests for ext4

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Date:	Mon, 4 Mar 2013 17:19:56 -0600
From:	Rich Johnston <rjohnston@....com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
CC:	<xfs@....sgi.com>, <linux-fsdevel@...r.kernel.org>,
	<linux-ext4@...r.kernel.org>, <dchinner@...hat.com>
Subject: Re: [PATCH 09/10] xfstest: add defragmentation stress tests for ext4

On 03/01/2013 07:30 PM, Dmitry Monakhov wrote:
> On Fri, 1 Mar 2013 13:23:50 -0600, Rich Johnston <rjohnston@....com> wrote:
>> On 02/20/2013 04:42 AM, Dmitry Monakhov wrote:

>>
>> Let me know if you agree with these changes and I will make them at
>> commit time.
> Yes, please do.
>>
>> Thanks
>> --Rich

commit a3d92a6cbdf9e98d8e256974b50b025d1d4575ec
Author: Dmitry Monakhov <dmonakhov@...nvz.org>
Date:   Wed Feb 20 10:42:14 2013 +0000

     xfstest: add defragmentation stress tests for ext4

     Perform various regression tests for ext4defrag subsystem

      301'th Test1: Defragment file while other task does direct AIO
      302'th Test2: Perform defragmentation on file under buffered AIO
         while third task does direct AIO to donor file
      303'th Test3: Two defrag tasks use common donor file.
      304'th Test4: Stress defragmentation. Several threads perform
         fragmentation at random position use inplace=1 will
         allocate and free blocks inside defrag event improve
         load pressure.

     This tests are considered dangerous because 302'th and 303'th are known
     to trigger OOPS on recent kernels 
see:https://gist.github.com/dmonakhov/4770
294

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