Re: [PATCH v3 3/6] mm: support THP migration to device private memory

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To: Ralph Campbell <rcampbell@xxxxxxxxxx>
Subject: Re: [PATCH v3 3/6] mm: support THP migration to device private memory
From: Christoph Hellwig <hch@xxxxxx>
Date: Fri, 6 Nov 2020 09:03:22 +0100
Cc: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxx>, Alistair Popple <apopple@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Bharata B Rao <bharata@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, Ben Skeggs <bskeggs@xxxxxxxxxx>, linux-kselftest@xxxxxxxxxxxxxxx, nouveau@xxxxxxxxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Zi Yan <ziy@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
In-reply-to: <20201106005147.20113-4-rcampbell@nvidia.com>
References: <20201106005147.20113-1-rcampbell@nvidia.com> <20201106005147.20113-4-rcampbell@nvidia.com>
User-agent: Mutt/1.5.17 (2007-11-01)

I hate the extra pin count magic here.  IMHO we really need to finish
off the series to get rid of the extra references on the ZONE_DEVICE
pages first.
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Follow-Ups:
- Re: [PATCH v3 3/6] mm: support THP migration to device private memory
  - From: Ralph Campbell

References:
- [PATCH v3 0/6] mm/hmm/nouveau: add THP migration to migrate_vma_*
  - From: Ralph Campbell
- [PATCH v3 3/6] mm: support THP migration to device private memory
  - From: Ralph Campbell

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