linux-kernel - Re: [PATCH -V8 02/10] mm/numa: automatically generate node migration order

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Date:   Tue, 22 Jun 2021 05:13:39 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Huang, Ying" <ying.huang@...el.com>, Zi Yan <ziy@...dia.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Yang Shi <shy828301@...il.com>,
        Michal Hocko <mhocko@...e.com>, Wei Xu <weixugc@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        osalvador <osalvador@...e.de>
Subject: Re: [PATCH -V8 02/10] mm/numa: automatically generate node migration
 order

On 6/21/21 6:14 PM, Huang, Ying wrote:
>> In our P9+volta system, GPU memory is exposed as a NUMA node.
>> For the GPU workloads with data size greater than GPU memory size,
>> it will be very helpful to allow pages in GPU memory to be migrated/demoted
>> to CPU memory. With your current assumption, GPU memory -> CPU memory
>> demotion seems not possible, right? This should also apply to any
>> system with a device memory exposed as a NUMA node and workloads running
>> on the device and using CPU memory as a lower tier memory than the device
>> memory.
> Thanks a lot for your use case!  It appears that the demotion path
> specified by users is one possible way to satisfy your requirement.  And
> I think it's possible to enable that on top of this patchset.  But we
> still have no specific plan to work on that at least for now.

In other words, patches to make adapt this to your use case would be
most welcome!