linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090328001432.5dd5f10f@lxorguk.ukuu.org.uk>
Date:	Sat, 28 Mar 2009 00:14:32 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
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>,
	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, 27 Mar 2009 16:38:35 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> Christoph Hellwig wrote:
> > And please add a tuneable for the flush.  Preferable a generic one at
> > the block device layer instead of the current mess where every
> > filesystem has a slightly different option for barrier usage.
> 
> 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.

The storage drivers for those cases already generally know this and treat
cache flush requests as "has hit nvram", even the non enterprise ones.

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