linux-kernel - Re: [PATCH -mm v2 04/11] rbtree: add helpers to find nearest uncle node

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Message-ID: <1340358580.18025.53.camel@twins>
Date:	Fri, 22 Jun 2012 11:49:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...riel.com>
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, aarcange@...hat.com,
	minchan@...il.com, kosaki.motohiro@...il.com, andi@...stfloor.org,
	hannes@...xchg.org, mel@....ul.ie, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH -mm v2 04/11] rbtree: add helpers to find nearest uncle
 node

On Thu, 2012-06-21 at 17:57 -0400, Rik van Riel wrote:
> It is useful to search an augmented rbtree based on the augmented
> data, ie. not using the sort key as the primary search criterium.
> However, we may still need to limit our search to a sub-part of the
> whole tree, using the sort key as limiters where we can search.
> 
> In that case, we may need to stop searching in one part of the tree,
> and continue the search at the nearest (great-?)uncle node in a particular
> direction.
> 
> Add helper functions to find the nearest uncle node.

I don't think we need these at all, in fact, I cannot prove your lookup
function is O(log n) at all, since the uncle might not have a suitable
max gap size, so you might need to find yet another uncle etc.


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