Date: Tue, 11 Nov 2014 13:00:56 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
To: j.glisse@gmail.com
cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Linus Torvalds <torvalds@linux-foundation.org>,
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Subject: Re: HMM (heterogeneous memory management) v6
In-Reply-To: <1415644096-3513-1-git-send-email-j.glisse@gmail.com>
Message-ID: <alpine.DEB.2.11.1411111259560.6657@gentwo.org>
References: <1415644096-3513-1-git-send-email-j.glisse@gmail.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org

On Mon, 10 Nov 2014, j.glisse@gmail.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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