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

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Date:	Fri, 8 Jun 2007 14:01:50 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Theodore Tso <tytso@....edu>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	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

> 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 ... 

It seems every purpose of this fd stuff is now a failure when
compared with existing behaviours.

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