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Date: Mon, 1 May 2017 16:04:15 -0500
From: Reza Arbab <arbab@linux.vnet.ibm.com>
Subject: Re: [RFC 0/4] RFC - Coherent Device Memory (Not for inclusion)
References: <20170419075242.29929-1-bsingharora@gmail.com>
 <91272c14-81df-9529-f0ae-6abb17a694ea@nvidia.com>
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In-Reply-To: <91272c14-81df-9529-f0ae-6abb17a694ea@nvidia.com>
Message-Id: <20170501210415.aeuvd73auomvdmba@arbab-laptop.localdomain>
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To: John Hubbard <jhubbard@nvidia.com>
Cc: Balbir Singh <bsingharora@gmail.com>, linux-mm@kvack.org, akpm@linux-foundation.org, khandual@linux.vnet.ibm.com, benh@kernel.crashing.org, aneesh.kumar@linux.vnet.ibm.com, paulmck@linux.vnet.ibm.com, srikar@linux.vnet.ibm.com, haren@linux.vnet.ibm.com, jglisse@redhat.com, mgorman@techsingularity.net, mhocko@kernel.org, vbabka@suse.cz, cl@linux.com

On Mon, May 01, 2017 at 01:41:55PM -0700, John Hubbard wrote:
>1. A way to move pages between NUMA nodes, both virtual address and 
>physical address-based, from kernel mode.

Jerome's migrate_vma() and migrate_dma() should have this covered, 
including DMA-accelerated copy.

>5. Something to handle the story of bringing NUMA nodes online and 
>putting them back offline, given that they require a device driver that 
>may not yet have been loaded. There are a few minor missing bits there.

This has been prototyped with the driver doing memory hotplug/hotremove.  
Could you elaborate a little on what you feel is missing?

-- 
Reza Arbab

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