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

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Message-ID: <20150424145738.GZ5561@linux.vnet.ibm.com>
Date:	Fri, 24 Apr 2015 07:57:38 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jerome Glisse <j.glisse@...il.com>,
	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 Fri, Apr 24, 2015 at 09:12:07AM -0500, Christoph Lameter wrote:
> On Thu, 23 Apr 2015, Paul E. McKenney wrote:
> 
> >
> > DAX
> >
> > 	DAX is a mechanism for providing direct-memory access to
> > 	high-speed non-volatile (AKA "persistent") memory.  Good
> > 	introductions to DAX may be found in the following LWN
> > 	articles:
> 
> DAX is a mechanism to access memory not managed by the kernel and is the
> successor to XIP. It just happens to be needed for persistent memory.
> Fundamentally any driver can provide an MMAPPed interface to allow access
> to a devices memory.

I will take another look, but others in this thread have called out
difficulties with DAX's filesystem nature.

							Thanx, Paul

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