From: Matthew Wilcox <matthew@wil.cx>
To: Ric Wheeler <rwheeler@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Black_David@emc.com,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Tom Coughlan <coughlan@redhat.com>,
Jens Axboe <jens.axboe@oracle.com>,
Chris Mason <chris.mason@oracle.com>,
Dave Chinner <david@fromorbit.com>
Subject: Aggregating discard requests in the filesystem
Date: Mon, 10 Nov 2008 13:39:15 -0700 [thread overview]
Message-ID: <20081110203915.GP15439@parisc-linux.org> (raw)
In-Reply-To: <4913028B.6010405@redhat.com>
On Thu, Nov 06, 2008 at 09:43:23AM -0500, Ric Wheeler wrote:
> I have been thinking about whether or not we can (and should) do
> anything more than our current best effort to send down large chunks
> (note that the "chunk" size can range from reasonable sizes like 8KB or
> so up to close to 1MB!).
One of the proposals in this thread (that has got buried somewhere) was
to expand any discard request sent down from the filesystem to encompass
all the adjacent free space. I've checked with our SSD people and
they're fine with this idea.
dwmw2 says "it isn't actually that hard in FAT" and then interjects some
personal opinion about this solution ;-)
Is it hard in XFS? btrfs? ext2? Does anyone have a problem with this
as a solution?
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2008-11-10 20:39 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-06 14:43 thin provisioned LUN support Ric Wheeler
2008-11-06 15:17 ` James Bottomley
2008-11-06 15:24 ` David Woodhouse
2008-11-06 16:00 ` Ric Wheeler
2008-11-06 16:40 ` Martin K. Petersen
2008-11-06 17:04 ` Ric Wheeler
2008-11-06 17:15 ` Matthew Wilcox
2008-11-07 12:05 ` Jens Axboe
2008-11-07 12:14 ` Ric Wheeler
2008-11-07 12:17 ` David Woodhouse
2008-11-07 12:19 ` Jens Axboe
2008-11-07 14:26 ` thin provisioned LUN support & file system allocation policy Ric Wheeler
2008-11-07 14:34 ` Matthew Wilcox
2008-11-07 14:45 ` Jörn Engel
2008-11-07 14:43 ` Theodore Tso
2008-11-07 14:54 ` Ric Wheeler
2008-11-07 15:26 ` jim owens
2008-11-07 15:31 ` David Woodhouse
2008-11-07 15:35 ` jim owens
2008-11-07 15:46 ` Theodore Tso
2008-11-07 15:51 ` Martin K. Petersen
2008-11-07 16:06 ` Ric Wheeler
2008-11-07 15:56 ` James Bottomley
2008-11-07 15:36 ` James Bottomley
2008-11-07 15:48 ` David Woodhouse
2008-11-07 15:36 ` Theodore Tso
2008-11-07 15:45 ` Matthew Wilcox
2008-11-07 15:45 ` Matthew Wilcox
2008-11-07 16:07 ` jim owens
2008-11-07 16:12 ` James Bottomley
2008-11-07 16:23 ` jim owens
2008-11-07 16:02 ` Ric Wheeler
2008-11-07 14:54 ` Ric Wheeler
2008-11-07 14:55 ` Matthew Wilcox
2008-11-07 14:55 ` Matthew Wilcox
2008-11-07 15:20 ` thin provisioned LUN support James Bottomley
2008-11-09 23:08 ` Dave Chinner
2008-11-09 23:37 ` James Bottomley
2008-11-10 0:33 ` Dave Chinner
2008-11-10 14:31 ` James Bottomley
2008-11-07 15:49 ` Chris Mason
2008-11-07 16:00 ` Martin K. Petersen
2008-11-07 16:06 ` James Bottomley
2008-11-07 16:11 ` Chris Mason
2008-11-07 16:18 ` James Bottomley
2008-11-07 16:22 ` Ric Wheeler
2008-11-07 16:27 ` James Bottomley
2008-11-07 16:28 ` David Woodhouse
2008-11-07 17:22 ` Chris Mason
2008-11-07 18:09 ` Ric Wheeler
2008-11-07 18:36 ` Theodore Tso
2008-11-07 18:41 ` Ric Wheeler
2008-11-07 18:41 ` Ric Wheeler
2008-11-07 19:35 ` Theodore Tso
2008-11-07 19:55 ` Martin K. Petersen
2008-11-07 20:19 ` Theodore Tso
2008-11-07 20:21 ` Matthew Wilcox
2008-11-07 20:21 ` Matthew Wilcox
2008-11-07 20:26 ` Ric Wheeler
2008-11-07 20:48 ` Chris Mason
2008-11-07 21:04 ` Ric Wheeler
2008-11-07 21:13 ` Theodore Tso
2008-11-07 20:42 ` Theodore Tso
2008-11-07 21:06 ` Martin K. Petersen
2008-11-07 20:37 ` Ric Wheeler
2008-11-10 2:44 ` Black_David
2008-11-10 2:44 ` Black_David
2008-11-10 2:36 ` Black_David
2008-11-10 2:36 ` Black_David
2008-11-07 19:44 ` jim owens
2008-11-07 19:48 ` Matthew Wilcox
2008-11-07 19:50 ` Ric Wheeler
2008-11-09 23:36 ` Dave Chinner
2008-11-10 3:40 ` Thin provisioning & arrays Black_David
2008-11-10 3:40 ` Black_David
2008-11-10 8:31 ` Dave Chinner
2008-11-10 9:59 ` David Woodhouse
2008-11-10 13:30 ` Matthew Wilcox
2008-11-10 13:36 ` Jens Axboe
2008-11-10 17:05 ` UNMAP is a hint Black_David
2008-11-10 17:05 ` Black_David
2008-11-10 17:30 ` Matthew Wilcox
2008-11-10 17:56 ` Ric Wheeler
2008-11-10 22:18 ` Thin provisioning & arrays Dave Chinner
2008-11-11 1:23 ` Black_David
2008-11-11 1:23 ` Black_David
2008-11-11 2:09 ` Keith Owens
2008-11-11 13:59 ` Ric Wheeler
2008-11-11 14:55 ` jim owens
2008-11-11 15:38 ` Ric Wheeler
2008-11-11 15:59 ` jim owens
2008-11-11 16:25 ` Ric Wheeler
2008-11-11 16:53 ` jim owens
2008-11-11 23:08 ` Dave Chinner
2008-11-11 23:52 ` jim owens
2008-11-11 23:52 ` jim owens
2008-11-11 22:49 ` Dave Chinner
2008-11-06 15:27 ` thin provisioned LUN support jim owens
2008-11-06 15:57 ` jim owens
2008-11-06 16:21 ` James Bottomley
[not found] ` <yq1d4h8nao5.fsf@sermon.lab.mkp.net>
2008-11-06 15:42 ` Ric Wheeler
2008-11-06 15:57 ` David Woodhouse
2008-11-06 22:36 ` Dave Chinner
2008-11-06 22:55 ` Ric Wheeler
2008-11-06 23:06 ` James Bottomley
2008-11-06 23:10 ` Ric Wheeler
2008-11-06 23:26 ` James Bottomley
2008-11-06 22:55 ` Ric Wheeler
2008-11-06 23:32 ` thin provisioned LUN support - T10 activity Black_David
2008-11-06 23:32 ` Black_David
2008-11-07 11:59 ` thin provisioned LUN support Artem Bityutskiy
2008-11-10 20:39 ` Matthew Wilcox [this message]
2008-11-10 20:44 ` Aggregating discard requests in the filesystem Chris Mason
2008-11-11 0:12 ` Brad Boyer
2008-11-11 15:25 ` jim owens
2008-11-11 16:40 ` thin provisioned LUN support Christoph Hellwig
2008-11-11 17:07 ` jim owens
2008-11-11 17:33 ` Christoph Hellwig
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