linux-kernel - Re: [PATCH 2/3] mm: Implement writeback livelock avoidance using page tagging

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Message-Id: <20100212113955.4c023130.akpm@linux-foundation.org>
Date:	Fri, 12 Feb 2010 11:39:55 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>, npiggin@...e.de,
	fengguang.wu@...el.com
Subject: Re: [PATCH 2/3] mm: Implement writeback livelock avoidance using
 page tagging

On Fri, 12 Feb 2010 00:06:23 +0100
Jan Kara <jack@...e.cz> wrote:

> The idea is simple: Tag all pages that should be written back
> with a special tag (TOWRITE) in the radix tree. This can be done
> rather quickly and thus livelocks should not happen in practice.
> Then we start doing the hard work of locking pages and sending
> them to disk only for those pages that have TOWRITE tag set.

Adding a second pass across all the pages sounds expensive?
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