[rds-devel] [PATCH] rds: convert get_user_pages() --> pin_user_pages()
David Miller
davem at davemloft.net
Sun May 17 12:38:06 PDT 2020
From: John Hubbard <jhubbard at nvidia.com>
Date: Sat, 16 May 2020 18:23:36 -0700
> This code was using get_user_pages_fast(), in a "Case 2" scenario
> (DMA/RDMA), using the categorization from [1]. That means that it's
> time to convert the get_user_pages_fast() + put_page() calls to
> pin_user_pages_fast() + unpin_user_pages() calls.
>
> There is some helpful background in [2]: basically, this is a small
> part of fixing a long-standing disconnect between pinning pages, and
> file systems' use of those pages.
>
> [1] Documentation/core-api/pin_user_pages.rst
>
> [2] "Explicit pinning of user-space pages":
> https://urldefense.com/v3/__https://lwn.net/Articles/807108/__;!!GqivPVa7Brio!IT378tQVnSzhymMYg8eOkT9JIQ6DK4oWinE9QzdXaoMZjQhxMrK0Oz0_1_KensjEaE4$
>
> Cc: David S. Miller <davem at davemloft.net>
> Cc: Jakub Kicinski <kuba at kernel.org>
> Cc: netdev at vger.kernel.org
> Cc: linux-rdma at vger.kernel.org
> Cc: rds-devel at oss.oracle.com
> Signed-off-by: John Hubbard <jhubbard at nvidia.com>
Applied to net-next, thanks.
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