linux-kernel - Re: [PATCH 1/3] Range tree implementation

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Message-ID: <1335294860.28150.219.camel@twins>
Date:	Tue, 24 Apr 2012 21:14:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Andrea Righi <andrea@...terlinux.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/3] Range tree implementation

On Tue, 2012-04-24 at 10:49 -0700, John Stultz wrote:
> This makes it
> very difficult to provide generic list_head like behavior, as
> the parent structures would need to be duplicated and removed,
> and that has lots of memory ownership issues. 

You can in fact modify the rb-tree to have O(1) iteration by using the
empty leaf pointers to keep pointers to next/prev nodes.

Its a bit of a bother since you'd need to wrap ->rb_left and ->rb_right
in functions.. but now that we have coccinelle that shouldn't actually
be too hard.


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