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Date: Mon, 4 Jun 2007 10:05:37 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Davide Libenzi <davidel@xmailserver.org>,
       Eric Dumazet <dada1@cosmosbay.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Ulrich Drepper <drepper@redhat.com>
Subject: Re: [patch 1/2] ufd v1 - unsequential O(1) fdmap core
Message-ID: <20070604080537.GA22898@elte.hu>
References: <send-serie.davidel@xmailserver.org.24319.1180825145.1> <46633047.1020707@cosmosbay.com> <Pine.LNX.4.64.0706031536000.13247@alien.or.mcafeemobile.com> <20070603230859.5000424d.akpm@linux-foundation.org>
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* Andrew Morton <akpm@linux-foundation.org> wrote:

> I must say that it's not really clear to me why this fdmap thing was 
> created.  Exactly what problem is it solving, and what properties is 
> it designed to have?
> 
> Could not a (prehaps suitably modified) IDR tree have adequately 
> provided those properties?
> 
> I'm sure it's good stuff, but the patches were presented as if we all 
> know what they're for.  But I don't.  Maybe I was asleep at the time.

i think this sums it up:

 http://www.uwsg.iu.edu/hypermail/linux/kernel/0705.3/2490.html

and some more, with a benchmark as well:

 http://linux.derkeiler.com/Mailing-Lists/Kernel/2007-05/msg13685.html

( blame Google for picking up two different lkml archives for the two
  searches i did :-)

	Ingo