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

To: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Subject: Re: [PATCH 09/10] xfstest: add defragmentation stress tests for ext4
From: Rich Johnston <rjohnston@xxxxxxx>
Date: Mon, 4 Mar 2013 17:19:56 -0600
Cc: <xfs@xxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>, <linux-ext4@xxxxxxxxxxxxxxx>, <dchinner@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <878v66h9ks.fsf@xxxxxxxxxx>
References: <1361356935-29153-1-git-send-email-dmonakhov@xxxxxxxxxx> <1361356935-29153-10-git-send-email-dmonakhov@xxxxxxxxxx> <51310046.5090306@xxxxxxx> <878v66h9ks.fsf@xxxxxxxxxx>
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On 03/01/2013 07:30 PM, Dmitry Monakhov wrote:
On Fri, 1 Mar 2013 13:23:50 -0600, Rich Johnston <rjohnston@xxxxxxx> 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.


commit a3d92a6cbdf9e98d8e256974b50b025d1d4575ec
Author: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
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

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