Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751512AbZCLDgZ (ORCPT ); Wed, 11 Mar 2009 23:36:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752076AbZCLDgQ (ORCPT ); Wed, 11 Mar 2009 23:36:16 -0400 Received: from kanga.kvack.org ([205.233.56.17]:38855 "EHLO kanga.kvack.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751001AbZCLDgQ (ORCPT ); Wed, 11 Mar 2009 23:36:16 -0400 Date: Wed, 11 Mar 2009 23:36:13 -0400 From: Benjamin LaHaise To: Eric Dumazet Cc: Andrew Morton , Jeff Moyer , Avi Kivity , linux-aio , zach.brown@oracle.com, linux-kernel@vger.kernel.org, Davide Libenzi 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 Message-ID: <20090312033613.GJ18665@kvack.org> References: <49B54143.1010607@redhat.com> <49B57CB0.5020300@cosmosbay.com> <49B875F7.3030305@cosmosbay.com> <20090312024419.GG18665@kvack.org> <49B8807A.5080302@cosmosbay.com> <20090312032928.GH18665@kvack.org> <49B88280.8060603@cosmosbay.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49B88280.8060603@cosmosbay.com> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 610 Lines: 13 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/