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

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Date:   Fri, 6 Nov 2020 09:03:22 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     linux-mm@...ck.org, nouveau@...ts.freedesktop.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Jason Gunthorpe <jgg@...dia.com>,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Zi Yan <ziy@...dia.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Ben Skeggs <bskeggs@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 3/6] mm: support THP migration to device private
 memory

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.