linux-kernel - Re: Interacting with coherent memory on external devices

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Message-ID: <alpine.DEB.2.11.1504271147020.29735@gentwo.org>
Date:	Mon, 27 Apr 2015 11:48:16 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Rik van Riel <riel@...hat.com>
cc:	Jerome Glisse <j.glisse@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jglisse@...hat.com, mgorman@...e.de, aarcange@...hat.com,
	airlied@...hat.com, aneesh.kumar@...ux.vnet.ibm.com,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Geoffrey Gerfin <ggerfin@...dia.com>,
	John McKenna <jmckenna@...dia.com>, akpm@...ux-foundation.org
Subject: Re: Interacting with coherent memory on external devices

On Mon, 27 Apr 2015, Rik van Riel wrote:

> Why would we want to avoid the sane approach that makes this thing
> work with the fewest required changes to core code?

Becaus new ZONEs are a pretty invasive change to the memory management and
because there are  other ways to handle references to device specific
memory.

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