From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755598Ab0BAQfP (ORCPT ); Mon, 1 Feb 2010 11:35:15 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33876 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754785Ab0BAQfN (ORCPT ); Mon, 1 Feb 2010 11:35:13 -0500 Message-ID: <4B670258.6060109@redhat.com> Date: Mon, 01 Feb 2010 11:33:28 -0500 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-4.fc12 Lightning/1.0pre Thunderbird/3.0 MIME-Version: 1.0 To: Minchan Kim CC: linux-mm@kvack.org, linux-kernel@vger.kernel.org, KOSAKI Motohiro , lwoodman@redhat.com, akpm@linux-foundation.org, Lee Schermerhorn , aarcange@redhat.com Subject: Re: [PATCH -mm] rmap: move exclusively owned pages to own anon_vma in do_wp_page References: <20100128002000.2bf5e365@annuminas.surriel.com> <20100128014357.54428c8a@annuminas.surriel.com> <1265037918.20322.32.camel@barrios-desktop> In-Reply-To: <1265037918.20322.32.camel@barrios-desktop> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/01/2010 10:25 AM, Minchan Kim wrote: >> Signed-off-by: Rik van Riel > Reviewed-by: Minchan Kim > > Let me have a question for my understanding. > > Still, don't we have a probability of O(N) in case of parent's page > at worst case? Yes, we do. However, this can only happen for 1/N pages. Having O(N) for every page can totally bog down a system, but only running into that worst case every 1/N pages should make things run OK again. -- All rights reversed. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id C3C2E6B0047 for ; Mon, 1 Feb 2010 11:34:53 -0500 (EST) Message-ID: <4B670258.6060109@redhat.com> Date: Mon, 01 Feb 2010 11:33:28 -0500 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH -mm] rmap: move exclusively owned pages to own anon_vma in do_wp_page References: <20100128002000.2bf5e365@annuminas.surriel.com> <20100128014357.54428c8a@annuminas.surriel.com> <1265037918.20322.32.camel@barrios-desktop> In-Reply-To: <1265037918.20322.32.camel@barrios-desktop> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Minchan Kim Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, KOSAKI Motohiro , lwoodman@redhat.com, akpm@linux-foundation.org, Lee Schermerhorn , aarcange@redhat.com List-ID: On 02/01/2010 10:25 AM, Minchan Kim wrote: >> Signed-off-by: Rik van Riel > Reviewed-by: Minchan Kim > > Let me have a question for my understanding. > > Still, don't we have a probability of O(N) in case of parent's page > at worst case? Yes, we do. However, this can only happen for 1/N pages. Having O(N) for every page can totally bog down a system, but only running into that worst case every 1/N pages should make things run OK again. -- All rights reversed. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org