linux-kernel - Re: Linux 2.6.29

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Message-ID: <49CA9114.3040205@garzik.org>
Date:	Wed, 25 Mar 2009 16:16:20 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Ric Wheeler <rwheeler@...hat.com>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, 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

Ric Wheeler wrote:> And, as I am sure that you do know, to add insult to 
injury, FLUSH_CACHE
> is per device (not file system).
> 
> When you issue an fsync() on a disk with multiple partitions, you will 
> flush the data for all of its partitions from the write cache....

SCSI'S SYNCHRONIZE CACHE command already accepts an (LBA, length) pair. 
  We could make use of that.

And I bet we could convince T13 to add FLUSH CACHE RANGE, if we could 
demonstrate clear benefit.

	Jeff



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