linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090329082557.GB4242@infradead.org>
Date:	Sun, 29 Mar 2009 04:25:57 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Theodore Tso <tytso@....edu>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Fri, Mar 27, 2009 at 04:38:35PM -0400, Jeff Garzik wrote:
> At the very least, IMO the block layer should be able to notice when  
> barriers need not be translated into cache flushes.  Most notably when  
> wb cache is disabled on the drive, something easy to auto-detect, but  
> probably a manual switch also, for people with enterprise battery-backed  
> storage and such.

Yeah, that's why I suggested to have the tuning knob in the block layer
and not in the fses when this came up last time.

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