linux-kernel - Re: [PATCH, RFC] xfs: batched discard support

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Message-ID: <4A8816FB.8070408@rtr.ca>
Date:	Sun, 16 Aug 2009 10:26:03 -0400
From:	Mark Lord <liml@....ca>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	xfs@....sgi.com, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH, RFC] xfs: batched discard support

Christoph Hellwig wrote:
> On Sun, Aug 16, 2009 at 09:59:32AM -0400, Mark Lord wrote:
>> Okay, I got Matthews patches updated onto 2.6.31, and fixed the incompatibilities
>> between those and the XFS TRIM patch (from Christoph), plus a sector_t printk issue.
>>
>> My apologies for attachments, but I am attaching the updated Christoph patch,
>> as well as my hacked-up forward-port of Matthew's patches.
>>
>> Not pretty, but they work.  :)
>>
>> Now.. running Christoph's "xfs trim" on a 4.6GB mostly already-trimmed
>> XFS partition gave this for the first time around:
> 
>> The problem is, it still issues TRIMs to the LLD one extent at a time.
>> Compare this with doing it all in a single TRIM command
>> with the wiper.sh script (filesystem unmounted):
> 
> I could do a variant which issues a single TRIM, but that would require
> us to lock out all other allocations for the time the trim takes.  I'll
> hack that up once I get some time.
..

Matthew's stuff will have to change to support that, too.
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