Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752204AbbHOI75 (ORCPT ); Sat, 15 Aug 2015 04:59:57 -0400 Received: from verein.lst.de ([213.95.11.211]:55814 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751328AbbHOI74 (ORCPT ); Sat, 15 Aug 2015 04:59:56 -0400 Date: Sat, 15 Aug 2015 10:59:54 +0200 From: Christoph Hellwig To: Dan Williams Cc: Jerome Glisse , "linux-kernel@vger.kernel.org" , Boaz Harrosh , Rik van Riel , "linux-nvdimm@lists.01.org" , Dave Hansen , david , Ingo Molnar , Linux MM , Ingo Molnar , Mel Gorman , "H. Peter Anvin" , Ross Zwisler , "torvalds@linux-foundation.org" , Christoph Hellwig Subject: Re: [RFC PATCH 1/7] x86, mm: ZONE_DEVICE for "device memory" Message-ID: <20150815085954.GC21033@lst.de> References: <20150813031253.36913.29580.stgit@otcpl-skl-sds-2.jf.intel.com> <20150813035005.36913.77364.stgit@otcpl-skl-sds-2.jf.intel.com> <20150814213714.GA3265@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 628 Lines: 12 On Fri, Aug 14, 2015 at 02:52:15PM -0700, Dan Williams wrote: > The idea is that this memory is not meant to be available to the page > allocator and should not count as new memory capacity. We're only > hotplugging it to get struct page coverage. This might need a bigger audit of the max_pfn usages. I remember architectures using it as a decisions for using IOMMUs or similar. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/