linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <Pine.LNX.4.64.0706081108130.5519@alien.or.mcafeemobile.com>
Date:	Fri, 8 Jun 2007 11:11:24 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Theodore Tso <tytso@....edu>, Ulrich Drepper <drepper@...hat.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Fri, 8 Jun 2007, Alan Cox wrote:

> > Um, how cheap do you need it?  get_random_int() is actually pretty
> > cheep, since it was designed to be usable by the networking stack for
> > sequence numbers for TCP packets; and it's not like sys_close() or
> > sys_open() is a majorly critical path, is it?  If the concern is
> 
> At this point wouldn't it be cheaper to allocate file handles using a
> different algorithm than firing up the RNG - say like in the POSIX
> fashion ... 

The only reason we use a floating base, is because Uli preferred to have 
non-exactly predictable fd allocations. There no reason of re-doing the 
same POSIX mistake all over again:

Errare humanum est, perseverare autem diabolicum


- Davide


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