linux-kernel - Re: [PATCH 0/5] rbtree based interval tree as a prio

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Date:	Mon, 13 Aug 2012 10:20:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	riel@...hat.com, vrajesh@...ch.edu, daniel.santos@...ox.com,
	aarcange@...hat.com, dwmw2@...radead.org,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH 0/5] rbtree based interval tree as a prio_tree
 replacement

On Tue, 2012-08-07 at 00:25 -0700, Michel Lespinasse wrote:
> a faster worst-case complexity of O(k+log N) for stabbing queries in a
> well-balanced prio tree, vs O(k*log N) for interval trees (where k=number
> of matches, N=number of intervals). Now this sounds great, but in practice
> prio trees don't realize this theorical benefit. First, the additional
> constraint makes them harder to update, so that the kernel implementation
> has to simplify things by balancing them like a radix tree, which is not
> always ideal. 

Not something spending a great deal of time on, but do you have any idea
what the radix like balancing does the the worst case stabbing
complexity?

Anyway, I like the thing, that prio-tree code always made my head hurt.
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