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

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Message-ID: <1429664686.27410.84.camel@kernel.crashing.org>
Date:	Wed, 22 Apr 2015 11:04:46 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Christoph Lameter <cl@...ux.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 Tue, 2015-04-21 at 17:57 -0700, Paul E. McKenney wrote:
> On Wed, Apr 22, 2015 at 10:42:52AM +1000, Benjamin Herrenschmidt wrote:
> > On Tue, 2015-04-21 at 18:49 -0500, Christoph Lameter wrote:
> > > On Tue, 21 Apr 2015, Paul E. McKenney wrote:
> > > 
> > > > Thoughts?
> > > 
> > > Use DAX for memory instead of the other approaches? That way it is
> > > explicitly clear what information is put on the CAPI device.
> > 
> > Care to elaborate on what DAX is ?
> 
> I would like to know as well.  My first attempt to Google got me nothing
> but Star Trek.  Is DAX the persistent-memory topic covered here?
> 
> 	https://lwn.net/Articles/591779/
> 	https://lwn.net/Articles/610174/
> 
> Ben will correct me if I am wrong, but I do not believe that we are
> looking for persistent memory in this case.

Right, it doesn't look at all like what we want.

Ben.


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