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

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Message-ID: <alpine.DEB.2.11.1504221018340.24979@gentwo.org>
Date:	Wed, 22 Apr 2015 10:20:08 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jglisse@...hat.com, mgorman@...e.de, aarcange@...hat.com,
	riel@...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 Tue, 21 Apr 2015, Paul E. McKenney wrote:

> Ben will correct me if I am wrong, but I do not believe that we are
> looking for persistent memory in this case.

DAX is way of mapping special memory into user space. Persistance is one
possible use case. Its like the XIP that you IBMers know from z/OS
or the 390 mainframe stuff.

Its been widely discussed at memory managenent meetings. A bit surprised
that this is not a well known thing.

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