From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx145.postini.com [74.125.245.145]) by kanga.kvack.org (Postfix) with SMTP id 049396B0074 for ; Thu, 29 Nov 2012 21:59:04 -0500 (EST) From: "Luck, Tony" Subject: RE: [PATCH v2 0/5] Add movablecore_map boot option Date: Fri, 30 Nov 2012 02:58:40 +0000 Message-ID: <3908561D78D1C84285E8C5FCA982C28F1C95FF53@ORSMSX108.amr.corp.intel.com> References: <1353667445-7593-1-git-send-email-tangchen@cn.fujitsu.com> <50B5CFAE.80103@huawei.com> <3908561D78D1C84285E8C5FCA982C28F1C95EDCE@ORSMSX108.amr.corp.intel.com> <50B68467.5020008@zytor.com> <20121129110045.GX8218@suse.de> In-Reply-To: <20121129110045.GX8218@suse.de> Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman , "H. Peter Anvin" Cc: Jiang Liu , Tang Chen , "akpm@linux-foundation.org" , "rob@landley.net" , "isimatu.yasuaki@jp.fujitsu.com" , "laijs@cn.fujitsu.com" , "wency@cn.fujitsu.com" , "linfeng@cn.fujitsu.com" , "yinghai@kernel.org" , "kosaki.motohiro@jp.fujitsu.com" , "minchan.kim@gmail.com" , "rientjes@google.com" , "rusty@rustcorp.com.au" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-doc@vger.kernel.org" , Len Brown , "Wang, Frank" > If any significant percentage of memory is in ZONE_MOVABLE then the memor= y > hotplug people will have to deal with all the lowmem/highmem problems > that used to be faced by 32-bit x86 with PAE enabled.=20 While these problems may still exist on large systems - I think it becomes harder to construct workloads that run into problems. In those bad old day= s a significant fraction of lowmem was consumed by the kernel ... so it was pretty easy to find meta-data intensive workloads that would push it over a cliff. Here we are talking about systems with say 128GB per node divide= d into 64GB moveable and 64GB non-moveable (and I'd regard this as a rather low-end machine). Unless the workload consists of zillions of tiny process= es all mapping shared memory blocks, the percentage of memory allocated to the kernel is going to be tiny compared with the old 4GB days. -Tony -- 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