From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754011AbZBCXJv (ORCPT ); Tue, 3 Feb 2009 18:09:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751374AbZBCXJj (ORCPT ); Tue, 3 Feb 2009 18:09:39 -0500 Received: from x35.xmailserver.org ([64.71.152.41]:37296 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750905AbZBCXJi (ORCPT ); Tue, 3 Feb 2009 18:09:38 -0500 X-AuthUser: davidel@xmailserver.org Date: Tue, 3 Feb 2009 15:09:36 -0800 (PST) From: Davide Libenzi X-X-Sender: davide@alien.or.mcafeemobile.com To: Andrew Morton cc: Jonathan Corbet , mpm@selenic.com, dada1@cosmosbay.com, Linux Kernel Mailing List , andi@firstfloor.org, oleg@redhat.com, viro@ZenIV.linux.org.uk, Davide Libenzi , David Miller , hch@lst.de, linux-api@vger.kernel.org, Alan Cox Subject: Re: [PATCH 2/4] Convert epoll to a bitlock In-Reply-To: <20090203145346.8df40277.akpm@linux-foundation.org> Message-ID: References: <1233598811-6871-1-git-send-email-corbet@lwn.net> <1233598811-6871-3-git-send-email-corbet@lwn.net> <20090203133942.2ecec281.akpm@linux-foundation.org> <4988BD4E.8080206@cosmosbay.com> <20090203140543.6e915f97.akpm@linux-foundation.org> <1233699722.3243.127.camel@calx> <20090203153740.363d0a04@bike.lwn.net> <20090203145346.8df40277.akpm@linux-foundation.org> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 3 Feb 2009, Andrew Morton wrote: > Well. We _could_ whack part of this nut with my usual hammer: protect > f_flags with file->f_dentry->d_inode->i_lock. IIRC there was some > objection to that - performance? If you meant it for epoll, that uses a single shared inode, that'd turn to be a global lock. - Davide