From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id A08CC6B004D for ; Tue, 18 Aug 2009 19:58:53 -0400 (EDT) Received: from m5.gw.fujitsu.co.jp ([10.0.50.75]) by fgwmail7.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n7INx0r7030379 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Wed, 19 Aug 2009 08:59:00 +0900 Received: from smail (m5 [127.0.0.1]) by outgoing.m5.gw.fujitsu.co.jp (Postfix) with ESMTP id 34F0F45DE54 for ; Wed, 19 Aug 2009 08:59:00 +0900 (JST) Received: from s5.gw.fujitsu.co.jp (s5.gw.fujitsu.co.jp [10.0.50.95]) by m5.gw.fujitsu.co.jp (Postfix) with ESMTP id 110D745DE4D for ; Wed, 19 Aug 2009 08:59:00 +0900 (JST) Received: from s5.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s5.gw.fujitsu.co.jp (Postfix) with ESMTP id E9C991DB8043 for ; Wed, 19 Aug 2009 08:58:59 +0900 (JST) Received: from ml13.s.css.fujitsu.com (ml13.s.css.fujitsu.com [10.249.87.103]) by s5.gw.fujitsu.co.jp (Postfix) with ESMTP id 984421DB805B for ; Wed, 19 Aug 2009 08:58:59 +0900 (JST) Date: Wed, 19 Aug 2009 08:57:03 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [Patch 8/8] kexec: allow to shrink reserved memory Message-Id: <20090819085703.ccf9992a.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <4A8A83F4.6010408@redhat.com> References: <20090812081731.5757.25254.sendpatchset@localhost.localdomain> <20090812081906.5757.39417.sendpatchset@localhost.localdomain> <4A83893D.50707@redhat.com> <4A83CD84.8040609@redhat.com> <4A8927DD.6060209@redhat.com> <20090818092939.2efbe158.kamezawa.hiroyu@jp.fujitsu.com> <4A8A4ABB.70003@redhat.com> <20090818172552.779d0768.kamezawa.hiroyu@jp.fujitsu.com> <4A8A83F4.6010408@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Amerigo Wang Cc: "Eric W. Biederman" , linux-kernel@vger.kernel.org, tony.luck@intel.com, linux-ia64@vger.kernel.org, linux-mm@kvack.org, Neil Horman , Andi Kleen , akpm@linux-foundation.org, bernhard.walle@gmx.de, Fenghua Yu , Ingo Molnar , Anton Vorontsov List-ID: On Tue, 18 Aug 2009 18:35:32 +0800 Amerigo Wang wrote: > KAMEZAWA Hiroyuki wrote: > > On Tue, 18 Aug 2009 14:31:23 +0800 > > Amerigo Wang wrote: > > > >>> It's hidden from the system before mem_init() ? > >>> > >>> > >> Not sure, but probably yes. It is reserved in setup_arch() which is > >> before mm_init() which calls mem_init(). > >> > >> Do you have any advice to free that reserved memory after boot? :) > >> > >> > > > > Let's see arch/x86/mm/init.c::free_initmem() > > > > Maybe it's all you want. > > > > - ClearPageReserved() > > - init_page_count() > > - free_page() > > - totalram_pages++ > > > > Just FYI: calling ClearPageReserved() caused an oops: "Unable to handle > paging request". > > I am trying to figure out why... > Hmm...then....memmap is not there. pfn_valid() check will help you. What arch ? x86-64 ? Thanks, -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: email@kvack.org