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To: Ingo Molnar <mingo@elte.hu>
Cc: Davide Libenzi <davidel@xmailserver.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Arjan van de Ven <arjan@infradead.org>,
       Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@zip.com.au>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Ulrich Drepper <drepper@redhat.com>, Zach Brown <zach.brown@oracle.com>,
       Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
       "David S. Miller" <davem@davemloft.net>,
       Benjamin LaHaise <bcrl@kvack.org>,
       Suparna Bhattacharya <suparna@in.ibm.com>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support
References: <20070213142010.GA638@elte.hu>
	<Pine.LNX.4.64.0702131219240.32055@alien.or.mcafeemobile.com>
	<20070213215724.GD22104@elte.hu>
From: Andi Kleen <andi@firstfloor.org>
Date: 14 Feb 2007 00:25:18 +0100
In-Reply-To: <20070213215724.GD22104@elte.hu>
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Ingo Molnar <mingo@elte.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