linux-kernel - Re: HMM (heterogeneous memory management) v6

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Date:	Tue, 11 Nov 2014 13:00:56 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	j.glisse@...il.com
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	joro@...tes.org, Mel Gorman <mgorman@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	Paul Blinzer <Paul.Blinzer@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	linux-fsdevel@...r.kernel.org, Linda Wang <lwang@...hat.com>,
	Kevin E Martin <kem@...hat.com>,
	Jerome Glisse <jglisse@...hat.com>, Jeff Law <law@...hat.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>
Subject: Re: HMM (heterogeneous memory management) v6

On Mon, 10 Nov 2014, j.glisse@...il.com wrote:

> In a nutshell HMM is a subsystem that provide an easy to use api to mirror a
> process address on a device with minimal hardware requirement (mainly device
> page fault and read only page mapping). This does not rely on ATS and PASID
> PCIE extensions. It intends to supersede those extensions by allowing to move
> system memory to device memory in a transparent fashion for core kernel mm
> code (ie cpu page fault on page residing in device memory will trigger
> migration back to system memory).

Could we define a new NUMA node that maps memory from the GPU and
then simply use the existing NUMA features to move a process over there.
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