From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f178.google.com (mail-pd0-f178.google.com [209.85.192.178]) by kanga.kvack.org (Postfix) with ESMTP id 7D1C56B0038 for ; Wed, 10 Jun 2015 16:40:11 -0400 (EDT) Received: by pdbnf5 with SMTP id nf5so44807587pdb.2 for ; Wed, 10 Jun 2015 13:40:11 -0700 (PDT) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTP id qo6si15550259pac.151.2015.06.10.13.40.10 for ; Wed, 10 Jun 2015 13:40:10 -0700 (PDT) From: "Luck, Tony" Subject: RE: [RFC PATCH 10/12] mm: add the buddy system interface Date: Wed, 10 Jun 2015 20:40:08 +0000 Message-ID: <3908561D78D1C84285E8C5FCA982C28F32A8F209@ORSMSX114.amr.corp.intel.com> References: <55704A7E.5030507@huawei.com> <55704CC4.8040707@huawei.com> <557691E0.5020203@jp.fujitsu.com> <5576BA2B.6060907@huawei.com> <5577A9A9.7010108@jp.fujitsu.com> In-Reply-To: <5577A9A9.7010108@jp.fujitsu.com> 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: Kamezawa Hiroyuki , Xishi Qiu Cc: Andrew Morton , "nao.horiguchi@gmail.com" , Yinghai Lu , "H. Peter Anvin" , Thomas Gleixner , "mingo@elte.hu" , Xiexiuqi , Hanjun Guo , Linux MM , LKML > I guess, mirrored memory should be allocated if !__GFP_HIGHMEM or !__GFP_= MOVABLE HIGHMEM shouldn't matter - partial memory mirror only makes any sense on X8= 6_64 systems ... 32-bit kernels don't even boot on systems with 64GB, and the minimum rational configuratio= n for a machine that supports mirror is 128GB (4 cpu sockets * 2 memory controller per socket * 4 channel= s per controller * 4GB DIMM ... leaving any channels empty likely leaves you short of memory bandwidth for = these high core count processors). MOVABLE is mostly the opposite of MIRROR - we never want to fill a kernel a= llocation from a MOVABLE page. I want all kernel allocations to be from MIRROR. -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