Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752819AbZI2O0z (ORCPT ); Tue, 29 Sep 2009 10:26:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752781AbZI2O0y (ORCPT ); Tue, 29 Sep 2009 10:26:54 -0400 Received: from smtp2.ultrahosting.com ([74.213.174.253]:56532 "EHLO smtp.ultrahosting.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752758AbZI2O0y (ORCPT ); Tue, 29 Sep 2009 10:26:54 -0400 Date: Tue, 29 Sep 2009 10:22:16 -0400 (EDT) From: Christoph Lameter X-X-Sender: cl@gentwo.org To: KAMEZAWA Hiroyuki cc: Hugh Dickins , Wu Fengguang , Nigel Cunningham , LKML , "linux-mm@kvack.org" Subject: Re: No more bits in vm_area_struct's vm_flags. In-Reply-To: <20090929105735.06eea1ee.kamezawa.hiroyu@jp.fujitsu.com> Message-ID: References: <4AB9A0D6.1090004@crca.org.au> <20090924100518.78df6b93.kamezawa.hiroyu@jp.fujitsu.com> <4ABC80B0.5010100@crca.org.au> <20090925174009.79778649.kamezawa.hiroyu@jp.fujitsu.com> <4AC0234F.2080808@crca.org.au> <20090928120450.c2d8a4e2.kamezawa.hiroyu@jp.fujitsu.com> <20090928033624.GA11191@localhost> <20090928125705.6656e8c5.kamezawa.hiroyu@jp.fujitsu.com> <20090929105735.06eea1ee.kamezawa.hiroyu@jp.fujitsu.com> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 707 Lines: 14 Another concern that has not been discussed is the increased cache footprint due to a slightly enlarged vm data working set (there is also a corresponding icache issue since additional accesses are needed). Could we stick with the current size and do combinations of flags like we do with page flags? VM_HUGETLB cannot grow up and down f.e. and there are certainly lots of other impossible combinations that can be used to put more information into the flags. -- 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/