From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756666AbYILQUe (ORCPT ); Fri, 12 Sep 2008 12:20:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753745AbYILQUZ (ORCPT ); Fri, 12 Sep 2008 12:20:25 -0400 Received: from e5.ny.us.ibm.com ([32.97.182.145]:36869 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753496AbYILQUY (ORCPT ); Fri, 12 Sep 2008 12:20:24 -0400 Subject: Re: [RFC] [PATCH 8/9] memcg: remove page_cgroup pointer from memmap From: Dave Hansen To: balbir@linux.vnet.ibm.com Cc: KAMEZAWA Hiroyuki , "xemul@openvz.org" , "hugh@veritas.com" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, menage@google.com, Dave Hansen In-Reply-To: <48CA9500.5060309@linux.vnet.ibm.com> References: <20080911200855.94d33d3b.kamezawa.hiroyu@jp.fujitsu.com> <20080911202249.df6026ae.kamezawa.hiroyu@jp.fujitsu.com> <48CA9500.5060309@linux.vnet.ibm.com> Content-Type: text/plain Date: Fri, 12 Sep 2008 09:19:14 -0700 Message-Id: <1221236354.17910.18.camel@nimitz> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2008-09-12 at 09:12 -0700, Balbir Singh wrote: > 3. Integrate with sparsemem (last resort for performance), Dave Hansen suggested > adding a mem_section member and using that. I also suggested using the sparsemem *structure* without necessarily using it for pfn_to_page() lookups. That'll take some rework to separate out SPARSEMEM_FOR_MEMMAP vs. CONFIG_SPARSE_STRUCTURE_FUN, but it should be able to be prototyped pretty fast. -- Dave