linux-kernel - Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support

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Message-ID: <p733b59hc81.fsf@bingen.suse.de>
Date:	14 Feb 2007 00:25:18 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support

Ingo Molnar <mingo@...e.hu> writes:
> 
> really, what's the point behind aio_cancel()?

The main use case is when you open a file requester on a network
file system where the server is down and you get tired of waiting
and press "Cancel" it should abort the hanging IO immediately.

At least I would appreciate such a feature sometimes.

e.g. the readdir loop could be a syslet (are they powerful
enough to allocate memory for a arbitary sized directory? Probably not) 
and then the cancel button could async_cancel() it.

-Andi

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