From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756985AbYHDN0V (ORCPT ); Mon, 4 Aug 2008 09:26:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753448AbYHDN0I (ORCPT ); Mon, 4 Aug 2008 09:26:08 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:36385 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752190AbYHDN0F (ORCPT ); Mon, 4 Aug 2008 09:26:05 -0400 Message-ID: <4897032E.5020601@linux-foundation.org> Date: Mon, 04 Aug 2008 08:25:02 -0500 From: Christoph Lameter User-Agent: Thunderbird 2.0.0.16 (Windows/20080708) MIME-Version: 1.0 To: Yasunori Goto CC: Badari Pulavarty , Andrew Morton , Mel Gorman , linux-mm , Linux Kernel ML Subject: Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing References: <20080801180522.EC97.E1E9C6FF@jp.fujitsu.com> <489314FE.7080900@linux-foundation.org> <20080802090335.D6C8.E1E9C6FF@jp.fujitsu.com> In-Reply-To: <20080802090335.D6C8.E1E9C6FF@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Yasunori Goto wrote: >>> Thanks for your comment. >> Duh. Then the use of RCU would also mean that all of reclaim must >> be in a rcu period. So reclaim cannot sleep anymore. > > I use srcu_read_lock() (sleepable rcu lock) if kernel must be sleep for > page reclaim. So, my patch basic idea is followings. But that introduces more overhead in __alloc_pages. From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4897032E.5020601@linux-foundation.org> Date: Mon, 04 Aug 2008 08:25:02 -0500 From: Christoph Lameter MIME-Version: 1.0 Subject: Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing References: <20080801180522.EC97.E1E9C6FF@jp.fujitsu.com> <489314FE.7080900@linux-foundation.org> <20080802090335.D6C8.E1E9C6FF@jp.fujitsu.com> In-Reply-To: <20080802090335.D6C8.E1E9C6FF@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Yasunori Goto Cc: Badari Pulavarty , Andrew Morton , Mel Gorman , linux-mm , Linux Kernel ML List-ID: Yasunori Goto wrote: >>> Thanks for your comment. >> Duh. Then the use of RCU would also mean that all of reclaim must >> be in a rcu period. So reclaim cannot sleep anymore. > > I use srcu_read_lock() (sleepable rcu lock) if kernel must be sleep for > page reclaim. So, my patch basic idea is followings. But that introduces more overhead in __alloc_pages. -- 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