linux-kernel - Re: Syslets, Threadlets, generic AIO support, v6

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Message-ID: <alpine.LFD.0.98.0705301457350.26602@woody.linux-foundation.org>
Date:	Wed, 30 May 2007 15:01:47 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Davide Libenzi <davidel@...ilserver.org>
cc:	Ulrich Drepper <drepper@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Jeff Garzik <jeff@...zik.org>,
	Zach Brown <zach.brown@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Syslets, Threadlets, generic AIO support, v6

On Wed, 30 May 2007, Davide Libenzi wrote:
> 
> I agree. What would be a good interface to allocate fds in such area? We 
> don't want to replicate syscalls, so maybe a special new dup function?

I'd do it with something like "newfd = dup2(fd, NONLINEAR_FD)" or similar, 
and just have NONLINEAR_FD be some magic value (for example, make it be 
0x40000000 - the bit that says "private, nonlinear" in the first place).

But what's gotten lost in the current discussion is that we probably don't 
actually _need_ such a private space. I'm just saying that if the *choice* 
is between memory-mapped interfaces and a private fd-space, we should 
probably go for the latter. "Everything is a file" is the UNIX way, after 
all. But there's little reason to introduce private fd's otherwise.

			Linus
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