Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751398AbXBMSDO (ORCPT ); Tue, 13 Feb 2007 13:03:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751400AbXBMSDO (ORCPT ); Tue, 13 Feb 2007 13:03:14 -0500 Received: from smtp.osdl.org ([65.172.181.24]:46433 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751398AbXBMSDO (ORCPT ); Tue, 13 Feb 2007 13:03:14 -0500 Date: Tue, 13 Feb 2007 09:58:17 -0800 From: Andrew Morton To: Dave Hansen Cc: linux-kernel@vger.kernel.org, hch@infradead.org Subject: Re: [PATCH 12/22] elevate write count files are open()ed Message-Id: <20070213095817.d2a8a380.akpm@linux-foundation.org> In-Reply-To: <1171385896.6202.20.camel@localhost.localdomain> References: <20070209225329.27619A62@localhost.localdomain> <20070209225337.C8EC7257@localhost.localdomain> <20070212211148.c9069c97.akpm@linux-foundation.org> <1171385896.6202.20.camel@localhost.localdomain> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.19; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 639 Lines: 13 > On Tue, 13 Feb 2007 08:58:16 -0800 Dave Hansen wrote: > > yipes. A new mount-wide spin_lock/unlock for each for-writing open() and close(). > > Can we have a microbenchmark on this please? > > Yeah, I'll schedule some dbench time on a NUMA machine. dbench doesn't do open() a lot. To assess the worst-case we'd need one process per cpu camping in an open/close loop. - 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/