linux-kernel - Re: [RFC PATCH 1/7] x86, mm: ZONE

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Message-ID: <20150815085954.GC21033@lst.de>
Date:	Sat, 15 Aug 2015 10:59:54 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Jerome Glisse <j.glisse@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	Rik van Riel <riel@...hat.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	david <david@...morbit.com>, Ingo Molnar <mingo@...nel.org>,
	Linux MM <linux-mm@...ck.org>, Ingo Molnar <mingo@...hat.com>,
	Mel Gorman <mgorman@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [RFC PATCH 1/7] x86, mm: ZONE_DEVICE for "device memory"

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.
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