linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090325215137.GQ32307@mit.edu>
Date:	Wed, 25 Mar 2009 17:51:37 -0400
From:	Theodore Tso <tytso@....edu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	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 Wed, Mar 25, 2009 at 01:45:43PM -0700, Linus Torvalds wrote:
> > The third potential solution we can try doing is to make some tuning
> > adjustments to the VM so that we start pushing out these data blocks
> > much more aggressively out to the disk.
> 
> Yes. but at least one problem is, as mentioned, that when the VM calls 
> writepage[s]() to start async writeback, many filesystems do seem to just 
> _block_ on it.

Um, no, ext3 shouldn't block on writepage().  Since it doesn't do
delayed allocation, it should always be able to push out a dirty page
to the disk.

						- Ted
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