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 1487B6003A9 for ; Tue, 29 Sep 2009 10:00:33 -0400 (EDT) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id 6452A82C8EB for ; Tue, 29 Sep 2009 10:29:54 -0400 (EDT) Received: from smtp.ultrahosting.com ([74.213.174.253]) by localhost (smtp.ultrahosting.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eFd7DvGpedwG for ; Tue, 29 Sep 2009 10:29:54 -0400 (EDT) Received: from gentwo.org (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id 9E6B882C906 for ; Tue, 29 Sep 2009 10:29:49 -0400 (EDT) Date: Tue, 29 Sep 2009 10:22:16 -0400 (EDT) From: Christoph Lameter 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> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: Hugh Dickins , Wu Fengguang , Nigel Cunningham , LKML , "linux-mm@kvack.org" List-ID: 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, 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