Re: [PATCH v4 09/23] mm/gup: introduce pin_user_pages*() and FOLL_PIN

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On 11/13/19 10:59 AM, Ira Weiny wrote:
On Tue, Nov 12, 2019 at 08:26:56PM -0800, John Hubbard wrote:
Introduce pin_user_pages*() variations of get_user_pages*() calls,
and also pin_longterm_pages*() variations.

These variants all set FOLL_PIN, which is also introduced, and
thoroughly documented.

The pin_longterm*() variants also set FOLL_LONGTERM, in addition
to FOLL_PIN:

     pin_user_pages()
     pin_user_pages_remote()
     pin_user_pages_fast()

     pin_longterm_pages()
     pin_longterm_pages_remote()
     pin_longterm_pages_fast()

At some point in this conversation I thought we were going to put in "unpin_*"
versions of these.

Is that still in the plans?


Why yes it is! :)  Daniel Vetter and Jan Kara both already weighed in [1],
in favor of "unpin_user_page*()", rather than "put_user_page*()".

I'll change those names.

[1] https://lore.kernel.org/r/20191113101210.GD6367@xxxxxxxxxxxxxx


thanks,
--
John Hubbard
NVIDIA




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