linux-kernel - Re: [patch 1/2] ufd v1 - unsequential O(1) fdmap core

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Message-Id: <20070604013449.ea3acca8.akpm@linux-foundation.org>
Date:	Mon, 4 Jun 2007 01:34:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [patch 1/2] ufd v1 - unsequential O(1) fdmap core

On Mon, 4 Jun 2007 10:09:41 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > i think this sums it up:
> > 
> >  http://www.uwsg.iu.edu/hypermail/linux/kernel/0705.3/2490.html
> 
> i mean this mail started it:
> 
>   http://linux.derkeiler.com/Mailing-Lists/Kernel/2007-05/msg13070.html
> 
> > and some more, with a benchmark as well:
> > 
> >  http://linux.derkeiler.com/Mailing-Lists/Kernel/2007-05/msg13685.html
> 

Yeah, I remember all that but I don't think it provides a suitable
description of what all this code is there for - what problem it is
solving and how it solves it.

If we just want some pseudo-private fd space for glibc to use then I'd have
thought that the existing code could be tweaked to do that: top-down
allocation, start at some high offset, etc.  But apparently there's more
to it than this.


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