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

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Message-ID: <Pine.LNX.4.64.0705301443340.6272@alien.or.mcafeemobile.com>
Date:	Wed, 30 May 2007 14:48:22 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Linus Torvalds <torvalds@...ux-foundation.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, Linus Torvalds wrote:

> > And then the semantics: do these descriptors should show up in
> > /proc/self/fd?  Are there separate directories for each namespace?  Do
> > they count against the rlimit?
> 
> Oh, absolutely. The'd be real fd's in every way. People could use them 
> 100% equivalently (and concurrently) with the traditional ones. The whole, 
> and the _only_ point, would be that it breaks the legacy guarantees of a 
> dense fd space.
> 
> Most apps don't actually *need* that dense fd space in any case. But by 
> defaulting to it, we wouldn't break those (few) apps that actually depend 
> on it.

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?



- Davide


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