From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m1.gw.fujitsu.co.jp ([10.0.50.71]) by fgwmail6.fujitsu.co.jp (8.12.10/Fujitsu Gateway) id i9J4OiqK009876 for ; Tue, 19 Oct 2004 13:24:44 +0900 (envelope-from kamezawa.hiroyu@jp.fujitsu.com) Received: from s3.gw.fujitsu.co.jp by m1.gw.fujitsu.co.jp (8.12.10/Fujitsu Domain Master) id i9J4OhND007049 for ; Tue, 19 Oct 2004 13:24:43 +0900 (envelope-from kamezawa.hiroyu@jp.fujitsu.com) Received: from s3.gw.fujitsu.co.jp (s3 [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 7735343F20 for ; Tue, 19 Oct 2004 13:24:43 +0900 (JST) Received: from fjmail503.fjmail.jp.fujitsu.com (fjmail503-0.fjmail.jp.fujitsu.com [10.59.80.100]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 1D63C43F23 for ; Tue, 19 Oct 2004 13:24:43 +0900 (JST) Received: from [10.124.100.187] (fjscan501-0.fjmail.jp.fujitsu.com [10.59.80.120]) by fjmail503.fjmail.jp.fujitsu.com (Sun Internet Mail Server sims.4.0.2001.07.26.11.50.p9) with ESMTP id <0I5T00CJEDL4N1@fjmail503.fjmail.jp.fujitsu.com> for linux-mm@kvack.org; Tue, 19 Oct 2004 13:24:41 +0900 (JST) Date: Tue, 19 Oct 2004 13:30:24 +0900 From: Hiroyuki KAMEZAWA Subject: Re: [Lhms-devel] CONFIG_NONLINEAR for small systems In-reply-to: <4173D219.3010706@shadowen.org> Message-id: <41749860.9070503@jp.fujitsu.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7bit References: <4173D219.3010706@shadowen.org> Sender: owner-linux-mm@kvack.org Return-Path: To: Andy Whitcroft Cc: lhms-devel@lists.sourceforge.net, linux-mm@kvack.org List-ID: Hi, Andy Whitcroft wrote: > The generalised CONFIG_NONLINEAR memory model described at OLS > seemed provide more than enough decriptive power to address this > issue but provided far more functionality that was required. > Particularly it breaks the identity V=P+c to allow compression of > the kernel address space, which is not required on these smaller systems. > We have *future* issue to hotplug kernel memory and kernel's virtual address renaming will be used for it. As you say, if kernel memory is not remaped, keeping V=P+c looks good. But our current direction is to enable kernel-memory-hotplug, which needs kernel's virtual memory renaming, I think. NONLINEAR_OPTIMISED looks a bit complicated. Can replace them with some other name ? Hmm...NONLINEAR_NOREMAP ? > This patch set is implemented as a proof-of-concept to show > that a simplified CONFIG_NONLINEAR based implementation could provide > sufficient flexibility to solve the problems for these systems. > Very interesting. But I'm not sure whether we can use more page->flags bit :[. I recommend you not to use more page->flags bits. Kame -- 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: aart@kvack.org