Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions

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To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
From: Christopher Lameter <cl@xxxxxxxxx>
Date: Wed, 20 Mar 2019 01:01:06 +0000
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>, john.hubbard@xxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Christian Benvenuti <benve@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>, Doug Ledford <dledford@xxxxxxxxxx>, Ira Weiny <ira.weiny@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>, Ralph Campbell <rcampbell@xxxxxxxxxx>, Tom Talpey <tom@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, John Hubbard <jhubbard@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>
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In-reply-to: <20190319235752.GB26298@dastard>
References: <20190308213633.28978-1-jhubbard@nvidia.com> <20190308213633.28978-2-jhubbard@nvidia.com> <20190319120417.yzormwjhaeuu7jpp@kshutemo-mobl1> <20190319134724.GB3437@redhat.com> <20190319141416.GA3879@redhat.com> <20190319212346.GA26298@dastard> <20190319220654.GC3096@redhat.com> <20190319235752.GB26298@dastard>
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On Wed, 20 Mar 2019, Dave Chinner wrote:

> So the plan for GUP vs writeback so far is "break fsync()"? :)

Well if its an anonymous page and not a file backed page then the
semantics are preserved. Disallow GUP long term pinning (marking stuff like in this
patchset may make that possible) and its clean.

References:
- [PATCH v4 0/1] mm: introduce put_user_page*(), placeholder versions
  - From: john . hubbard
- [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: john . hubbard
- Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: Kirill A. Shutemov
- Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: Jerome Glisse
- Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: Jerome Glisse
- Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: Dave Chinner
- Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: Jerome Glisse
- Re: [PATCH v4 1/1] mm: introduce put_user_page*(), placeholder versions
  - From: Dave Chinner

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