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[134.134.136.20]) by mx.google.com with ESMTPS id u125si35063826pfb.112.2019.04.29.09.58.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 29 Apr 2019 09:58:11 -0700 (PDT) Received-SPF: pass (google.com: domain of tony.luck@intel.com designates 134.134.136.20 as permitted sender) client-ip=134.134.136.20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of tony.luck@intel.com designates 134.134.136.20 as permitted sender) smtp.mailfrom=tony.luck@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Apr 2019 09:58:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,410,1549958400"; d="scan'208";a="169009686" Received: from orsmsx109.amr.corp.intel.com ([10.22.240.7]) by fmsmga001.fm.intel.com with ESMTP; 29 Apr 2019 09:58:10 -0700 Received: from orsmsx104.amr.corp.intel.com ([169.254.4.183]) by ORSMSX109.amr.corp.intel.com ([169.254.11.52]) with mapi id 14.03.0415.000; Mon, 29 Apr 2019 09:58:09 -0700 From: "Luck, Tony" To: Christoph Hellwig , Meelis Roos CC: Christopher Lameter , Mel Gorman , Andrew Morton , Mikulas Patocka , James Bottomley , "linux-parisc@vger.kernel.org" , "linux-mm@kvack.org" , Vlastimil Babka , LKML , "linux-arch@vger.kernel.org" , "Yu, Fenghua" , "linux-ia64@vger.kernel.org" Subject: RE: DISCONTIGMEM is deprecated Thread-Topic: DISCONTIGMEM is deprecated Thread-Index: AQHU/ZpXmcVCt4ADQUqjpwA1uPgMxaZTXO4w Date: Mon, 29 Apr 2019 16:58:09 +0000 Message-ID: <3908561D78D1C84285E8C5FCA982C28F7E9140BA@ORSMSX104.amr.corp.intel.com> References: <20190419094335.GJ18914@techsingularity.net> <20190419140521.GI7751@bombadil.infradead.org> <0100016a461809ed-be5bd8fc-9925-424d-9624-4a325a7a8860-000000@email.amazonses.com> <25cabb7c-9602-2e09-2fe0-cad3e54595fa@linux.ee> <20190428081353.GB30901@infradead.org> In-Reply-To: <20190428081353.GB30901@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiZDZlMGYwOWMtYjMxNC00ZDg2LWI2OTMtNDI5NjUwZDU1NzllIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX05UIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE3LjEwLjE4MDQuNDkiLCJUcnVzdGVkTGFiZWxIYXNoIjoiR3gxdGpVSlhOVlhRSWZVOExpNUk0emx1dkVMZzdGZ3QrK21zNE95d2g0a0VGR0tvWTVQY1lRUDBuMjkwVWNEZiJ9 x-ctpclassification: CTP_NT dlp-product: dlpe-windows dlp-version: 11.0.600.7 dlp-reaction: no-action x-originating-ip: [10.22.254.140] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > ia64 has a such a huge number of memory model choices. Maybe we > need to cut it down to a small set that actually work. SGI systems had extremely discontiguous memory (they used some high order physical address bits in the tens/hundreds of terabyte range for the node number ... so there would be a few GBytes of actual memory then a huge gap before the next node had a few more Gbytes). I don't know of anyone still booting upstream on an SN2, so if we start doi= ng serious hack and slash the chances are high that SN2 will be broken (if it = isn't already). -Tony