From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx118.postini.com [74.125.245.118]) by kanga.kvack.org (Postfix) with SMTP id DA3E16B006C for ; Wed, 28 Nov 2012 00:17:55 -0500 (EST) Message-ID: <50B59E54.9090107@huawei.com> Date: Wed, 28 Nov 2012 13:17:08 +0800 From: Jiang Liu MIME-Version: 1.0 Subject: Re: [PATCH v2 0/5] Add movablecore_map boot option References: <1353667445-7593-1-git-send-email-tangchen@cn.fujitsu.com> <50B42F32.4050107@gmail.com> <50B58965.7040703@cn.fujitsu.com> <50B58CA9.9010606@huawei.com> <50B59F5B.5030400@cn.fujitsu.com> In-Reply-To: <50B59F5B.5030400@cn.fujitsu.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Wen Congyang Cc: Tang Chen , wujianguo , hpa@zytor.com, akpm@linux-foundation.org, rob@landley.net, isimatu.yasuaki@jp.fujitsu.com, laijs@cn.fujitsu.com, linfeng@cn.fujitsu.com, yinghai@kernel.org, kosaki.motohiro@jp.fujitsu.com, minchan.kim@gmail.com, mgorman@suse.de, rientjes@google.com, rusty@rustcorp.com.au, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org On 2012-11-28 13:21, Wen Congyang wrote: > At 11/28/2012 12:01 PM, Jiang Liu Wrote: >> On 2012-11-28 11:47, Tang Chen wrote: >>> On 11/27/2012 11:10 AM, wujianguo wrote: >>>> >>>> Hi Tang, >>>> DMA address can't be set as movable, if some one boot kernel with >>>> movablecore_map=4G@0xa00000 or other memory region that contains DMA address, >>>> system maybe boot failed. Should this case be handled or mentioned >>>> in the change log and kernel-parameters.txt? >>> >>> Hi Wu, >>> >>> I think we can use MAX_DMA_PFN and MAX_DMA32_PFN to prevent setting DMA >>> address as movable. Just ignore the address lower than them, and set >>> the rest as movable. How do you think ? >>> >>> And, since we cannot figure out the minimum of memory kernel needs, I >>> think for now, we can just add some warning into kernel-parameters.txt. >>> >>> Thanks. :) >> On one other OS, there is a mechanism to dynamically convert pages from >> movable zones into normal zones. > > The OS auto does it? Or the user coverts it? > > We can convert pages from movable zones into normal zones by the following > interface: > echo online_kernel >/sys/devices/system/memory/memoryX/state > > We have posted a patchset to implement it, and it is in mm tree now. OS automatically converts it, no manual operations needed. -- 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