linux-kernel - Re: [patch] Converting writeback linked lists to a tree based data structure

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Message-Id: <E1JF0It-0000yD-Mi@localhost.localdomain>
Date:	Wed, 16 Jan 2008 12:55:07 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michael Rubin <mrubin@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] Converting writeback linked lists to a tree based data structure

On Tue, Jan 15, 2008 at 08:42:36PM -0800, Andrew Morton wrote:
> On Wed, 16 Jan 2008 12:25:53 +0800 Fengguang Wu <wfg@...l.ustc.edu.cn> wrote:
> 
> > list_heads are OK if we use them for one and only function.
> 
> Not really.  They're inappropriate when you wish to remember your
> position in the list while you dropped the lock (as we must do in
> writeback).
> 
> A data structure which permits us to interate across the search key rather
> than across the actual storage locations is more appropriate.

I totally agree with you. What I mean is to first do the split of
functions - into three: ordering, starvation prevention, and blockade
waiting. Then to do better ordering by adopting radix tree(or rbtree
if radix tree is not enough), and lastly get rid of the list_heads to
avoid locking. Does it sound like a good path?

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