Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261555AbVCCGbH (ORCPT ); Thu, 3 Mar 2005 01:31:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261550AbVCCGXj (ORCPT ); Thu, 3 Mar 2005 01:23:39 -0500 Received: from fire.osdl.org ([65.172.181.4]:11477 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S261502AbVCCGUb (ORCPT ); Thu, 3 Mar 2005 01:20:31 -0500 Date: Wed, 2 Mar 2005 22:20:08 -0800 From: Andrew Morton To: Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org Subject: Re: Page fault scalability patch V18: Drop first acquisition of ptl Message-Id: <20050302222008.4910eb7b.akpm@osdl.org> In-Reply-To: References: <20050302174507.7991af94.akpm@osdl.org> <20050302185508.4cd2f618.akpm@osdl.org> <20050302201425.2b994195.akpm@osdl.org> <20050302205612.451d220b.akpm@osdl.org> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-redhat-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: 837 Lines: 24 Christoph Lameter wrote: > > On Wed, 2 Mar 2005, Andrew Morton wrote: > > > > Any mmap changes requires the mmapsem. > > > > sys_remap_file_pages() will call install_page() under down_read(mmap_sem). > > It relies upon page_table_lock for pte atomicity. > > This is not relevant since it only deals with file pages. OK. And CONFIG_DEBUG_PAGEALLOC? > ptes are only > installed atomically for anonymous memory (if CONFIG_ATOMIC_OPS > is defined). It's a shame. A *nice* solution to this problem would address all pte ops and wouldn't have such special cases... - 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/