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

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Message-ID: <20070608222437.540bd8a6@the-village.bc.nu>
Date:	Fri, 8 Jun 2007 22:24:37 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Ulrich Drepper <drepper@...hat.com>, Theodore Tso <tytso@....edu>,
	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

> > #1: Throw the whole thing away and accept its not a good idea anyway
> 
> Unfortunately (exactly because of the same guarantees you're asking for 
> those handles), in order for userspace libraries to reliably internally 
> use fds to interact with the kernel, you need another kind of allocation 
> strategy.

Unproven and dubious at best as a claim.

> > #2: If I was really going this way and I wanted to use it for serious
> > tricks for high performance I/O then I'd provide the handle from
> > userspace so that the strategy for allocation is controlled by the caller
> > who is the only one who can make the smart decisions
> 
> It does not work. What if the main application, library A and library B 
> wants to implement their own allocation strategy?

Its called "discipline". I would suggest that libc contains a default
allocator. You might also want to assign library and application ranges
for clarity.

Alan
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