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Re: [PATCH 5/6] xfs: add online discard support

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 5/6] xfs: add online discard support
From: Alex Elder <aelder@xxxxxxx>
Date: Fri, 25 Mar 2011 16:04:52 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20110322200138.024991786@xxxxxxxxxxxxxxxxxxxxxx>
References: <20110322195550.260682574@xxxxxxxxxxxxxxxxxxxxxx> <20110322200138.024991786@xxxxxxxxxxxxxxxxxxxxxx>
Reply-to: aelder@xxxxxxx
On Tue, 2011-03-22 at 15:55 -0400, Christoph Hellwig wrote:
> Now that we have reliably tracking of deleted extents in a transaction
> we can easily implement "online" discard support which calls
> blkdev_issue_discard once a transaction commits.
> 
> The actual discard is a two stage operation as we first have to mark
> the busy extent as not available for reuse before we can start the
> actual discard.  Note that we don't bother supporting discard for
> the non-delaylog mode.  While that would be possible with this patch
> performance is awfull, and the optimization in the next patch won't
> work as easily.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

. . .

This one looks good overall.  How about adding
documentation to Documentation/filesystems/xfs.txt
to describe the new mount options?  (Dave, same
goes for you with delaylog.  I haven't looked for
any other things missing from there.)

Reviewed-by: Alex Elder <aelder@xxxxxxx>


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