linux-kernel - Re: [patch] aio: remove aio-max-nr and instead use the memlock rlimit to limit the number of pages pinned for the aio completion ring

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Date:	Wed, 11 Mar 2009 23:36:13 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Moyer <jmoyer@...hat.com>, Avi Kivity <avi@...hat.com>,
	linux-aio <linux-aio@...ck.org>, zach.brown@...cle.com,
	linux-kernel@...r.kernel.org,
	Davide Libenzi <davidel@...ilserver.org>
Subject: Re: [patch] aio: remove aio-max-nr and instead use the memlock rlimit to limit the number of pages pinned for the aio completion ring

On Thu, Mar 12, 2009 at 04:33:20AM +0100, Eric Dumazet wrote:
> aio breaks the fget_light() concept too, if process is mono threaded.

AIO requests cannot use fget_light().  The user space program could very 
well use the close() syscall to destroy the file descriptor while an io 
request is in flight, so you cannot avoid the reference counting overhead.

		-ben
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