linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <18100.46804.731940.246225@gargle.gargle.HOWL>
Date:	Sat, 4 Aug 2007 21:26:44 +0400
From:	Nikita Danilov <nikita@...sterfs.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

Andrew Morton writes:

[...]

 > 
 > It's pretty much unfixable given the ext3 journalling design, and the
 > guarantees which data-ordered provides.

ZFS has intent log to handle this
(http://blogs.sun.com/realneel/entry/the_zfs_intent_log). Something like
that can --theoretically-- be added to ext3-style journalling.

Nikita.

 > 
 > The easy preventive is to mount with data=writeback.  Maybe that should
 > have been the default.

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