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

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Date:	Wed, 30 May 2007 14:54:33 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Davide Libenzi <davidel@...ilserver.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>,
	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

Linus Torvalds wrote:
> Side note: it might not even be a "close-on-exec by default" thing: it 
> might well be a *always* close-on-exec.
>
> That COE is pretty horrid to do, we need to scan a bitmap of those things 
> on each exec. So it migth be totally sensible to just declare that the 
> non-linear fd's would simply always be "local", and never bleed across an 
> execve).

Hm, I wouldn't limit the mechanism prematurely.  Using Valgrind as an
example of an alternate user of this mechanism, it would be useful to
use a pipe to transmit out-of-band information from an exec-er to an
exec-ee process.  At the moment there's a lot mucking around with
execve() to transmit enough information from the parent valgrind to its
successor.

    J
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