linux-kernel - Re: [RFC] B+Tree library V2

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Message-Id: <1225916724.3619.175.camel@johannes.berg>
Date:	Wed, 05 Nov 2008 21:25:24 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Jörn Engel <joern@...fs.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] B+Tree library V2

On Wed, 2008-11-05 at 21:21 +0100, Jörn Engel wrote:
> On Wed, 5 November 2008 21:12:34 +0100, Johannes Berg wrote:
> > On Wed, 2008-11-05 at 21:06 +0100, Jörn Engel wrote:
> > > On Wed, 5 November 2008 20:57:20 +0100, Johannes Berg wrote:
> > > > 
> > > > That sounds fair, after all at least it limits the tree size, but I'm
> > > > too lazy to calculate the worst case right now.
> > > 
> > > Worst case you have a single entry next to a full node, then split the
> > > full node, etc.  So slightly more than 1/4 populated.
> > 
> > That would be roughly 1/3, no? But it doesn't really matter much.
> 
> When entries/node approaches infinity it is 1/4.  With 4 entries/node,
> which is the smallest useful number, it is 3/8.

Ah, right.

> > How we going to synchronise this? I'm not in a hurry with this scanning
> > code and I need to work on it still anyway.
> 
> I could create a git tree and ask for inclusion in -next.  Or you could
> combine it with your code.  I slightly favor the latter, as a library
> without any users is somewhat... useless.

I can do that, though I can't promise right now when I'll actually be
able to solve the remaining problems with that code. And I also thought
you already had another user in mind :)

johannes

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