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

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Message-ID: <Pine.LNX.4.64.0706092047270.23139@alien.or.mcafeemobile.com>
Date:	Sat, 9 Jun 2007 20:49:28 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Al Viro <viro@....linux.org.uk>,
	Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Sat, 9 Jun 2007, Davide Libenzi wrote:

> On Sat, 9 Jun 2007, Linus Torvalds wrote:
> 
> > On Sat, 9 Jun 2007, Al Viro wrote:
> > > 
> > > Eww...  Idea of pipe(2) taking flags as argument...
> > 
> > Right. That was one of the patches, and it was one that I said was too 
> > damn ugly to live.
> > 
> > So I instead suggested the alternate approach of adding a single new 
> > system call that runs another system call indirectly, with a set of flags 
> > and/or other behaviour modifications.
> 
> What if we put a data section in the vdso and we let userspace set the 
> flags or whatever in there? Syslets could use one of those bits to set the 
> "threadlet mode" w/out calling a syscall at all.
> In that way we have no new syscalls whatsoever. No?

Uhh, never mind :) That won't work in the vdso. Maybe in a TLS area.


- Davide


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