linux-kernel - Re: [v2 00/11] THP support for zone device page migration

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Message-ID: <df265383-476c-4f0b-87a0-37b5ff8e203d@redhat.com>
Date: Thu, 31 Jul 2025 10:56:51 +0200
From: David Hildenbrand <david@...hat.com>
To: Balbir Singh <balbirs@...dia.com>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, Karol Herbst <kherbst@...hat.com>,
 Lyude Paul <lyude@...hat.com>, Danilo Krummrich <dakr@...nel.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Jérôme Glisse <jglisse@...hat.com>,
 Shuah Khan <shuah@...nel.org>, Barry Song <baohua@...nel.org>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Ryan Roberts <ryan.roberts@....com>, Matthew Wilcox <willy@...radead.org>,
 Peter Xu <peterx@...hat.com>, Zi Yan <ziy@...dia.com>,
 Kefeng Wang <wangkefeng.wang@...wei.com>, Jane Chu <jane.chu@...cle.com>,
 Alistair Popple <apopple@...dia.com>, Donet Tom <donettom@...ux.ibm.com>,
 Ralph Campbell <rcampbell@...dia.com>, Mika Penttilä
 <mpenttil@...hat.com>, Matthew Brost <matthew.brost@...el.com>,
 Francois Dugast <francois.dugast@...el.com>
Subject: Re: [v2 00/11] THP support for zone device page migration

On 31.07.25 10:41, Balbir Singh wrote:
> On 7/30/25 21:30, David Hildenbrand wrote:
>> On 30.07.25 11:21, Balbir Singh wrote:
>>
>> BTW, I keep getting confused by the topic.
>>
>> Isn't this essentially
>>
>> "mm: support device-private THP"
>>
>> and the support for migration is just a necessary requirement to *enable* device private?
>>
> 
> I agree, I can change the title, but the focus of the use case is to
> support THP migration for improved latency and throughput. All of that
> involves support of device-private THP

Well, the subject as is makes one believe that THP support for 
zone-device pages would already be there, and that you are adding 
migration support.

That was the confusing part to me, because in the very first patch you 
add ... THP support for (selected/private) zone device pages.

-- 
Cheers,

David / dhildenb