linux-kernel - Re: [PATCH] add b+tree library

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Message-ID: <20090117175308.GB1409@ucw.cz>
Date:	Sat, 17 Jan 2009 18:53:08 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	J?rn Engel <joern@...fs.org>
Subject: Re: [PATCH] add b+tree library

Hi!


> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ wireless-testing/lib/btree.c	2009-01-10 11:41:47.000000000 +0100
> @@ -0,0 +1,797 @@
> +/*
> + * lib/btree.c	- Simple In-memory B+Tree
> + *
> + * As should be obvious for Linux kernel code, license is GPLv2
> + *
> + * Copyright (c) 2007-2008 Joern Engel <joern@...fs.org>
> + * Bits and pieces stolen from Peter Zijlstra's code, which is
> + * Copyright 2007, Red Hat Inc. Peter Zijlstra <pzijlstr@...hat.com>
> + * GPLv2
> + *
> + * see http://programming.kicks-ass.net/kernel-patches/vma_lookup/btree.patch
> + *
> + * A relatively simple B+Tree implementation.  I have written it as a learning
> + * excercise to understand how B+Trees work.  Turned out to be useful as well.
> + *
> + * B+Trees can be used similar to Linux radix trees (which don't have anything
> + * in common with textbook radix trees, beware).  Prerequisite for them working
> + * well is that access to a random tree node is much faster than a large number
> + * of operations within each node.

should be 'much slower'?

Because otherwise I don't get it.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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