linux-kernel - Re: Discard support (was Re: [PATCH] swap: send callback when swap slot is freed)

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Date:	Mon, 17 Aug 2009 19:24:02 +0000
From:	James Bottomley <James.Bottomley@...e.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Matthew Wilcox <matthew@....cx>,
	Arjan van de Ven <arjan@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Mark Lord <liml@....ca>,
	Chris Worley <worleys@...il.com>,
	Bryan Donlan <bdonlan@...il.com>, david@...g.hm,
	Greg Freemyer <greg.freemyer@...il.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Nitin Gupta <ngupta@...are.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	Linux RAID <linux-raid@...r.kernel.org>
Subject: Re: Discard support (was Re: [PATCH] swap: send callback when swap
 slot is freed)

On Mon, 2009-08-17 at 15:12 -0400, Christoph Hellwig wrote:
> On Mon, Aug 17, 2009 at 08:10:38AM -0600, Matthew Wilcox wrote:
> > On Mon, Aug 17, 2009 at 08:56:12AM -0500, James Bottomley wrote:
> > > The testing was initially done to see if the initial maximal discard
> > > proposal from LSF09 was a viable approach (which it wasn't given the
> > > time taken to UNMAP).
> > 
> > It would be nice if that feedback could be made public instead of it
> > leaking out in dribs and drabs like this.
> 
> Yeah, I don't remember hearing about anything like this either.

Well you were both in #storage when it got discussed on 4 May.  However,
I'm hopeful that the array vendors will make a more direct statement of
the capabilities shortly.

James


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