linux-ext4 - Re: Online ext4 defragmention

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Date:	Mon, 12 Jan 2009 08:39:33 -0500
From:	"Mike Snitzer" <snitzer@...il.com>
To:	"Theodore Tso" <tytso@....edu>
Cc:	"Alex Buell" <alex.buell@...ted.org.uk>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org
Subject: Re: Online ext4 defragmention

On Sun, Jan 11, 2009 at 3:28 PM, Theodore Tso <tytso@....edu> wrote:
> On Sun, Jan 11, 2009 at 01:44:43PM +0000, Alex Buell wrote:
>> Can someone confirm if the online ext4 defragmentation ioctls will
>> be going into 2.6.29? Thanks, I'm planning a migration from a
>> disparate collection of filesystems to ext4 over the next few months.
>
> Unfortunately, the defragmentation patches need to a lot of work (to
> be honest, largely refactored and almost rewritten) before they are
> ready to for mainline yes.  I am also concerned that the current
> defrag patches also try too hard to keep blocks in the same block
> group, even as a higher priority keeping them non-fragmented.
>
> Also, note that some of the benefits of ext4 only show up if you do a
> backup, mkfs, and restore; that's because there are layout changes
> that can only take place if you reformat the filesystem.  Finally,
> there are some allocation algorithm changes which didn't make the
> 2.6.29 merge window which I think will make a long-term difference.
> So you'll probably want to use 2.6.29 with the ext4 patch set.

Hi Ted,

Could you elaborate on which allocation patches you're referring to in
the ext4 patch queue (2.6.28-ext4-3?) ?

Thanks,
Mike
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