linux-kernel - [PATCH 0/1] IB/umem: use get_user_pages

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Date:   Fri, 8 Nov 2019 18:04:33 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jason Gunthorpe <jgg@...pe.ca>
CC:     Ira Weiny <ira.weiny@...el.com>, <linux-rdma@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 0/1] IB/umem: use get_user_pages_fast() to pin DMA pages

Hi Jason, Andrew,

Jason: Here is the change to get_user_pages_fast(), that you requested
during the review of "mm/gup: track dma-pinned pages: FOLL_PIN,
FOLL_LONGTERM" [1].

This is a stand-alone patch that applies to today's 5.4.0-rc6 linux.git.

If anyone could please provide any run-time testing (and of course,
Reviewed-by's), that would be huge. I've compiled and run it, but
bpftrace tells me (as I already knew) that my current anemic IB setup
is not actually exercising this code path.

Andrew: unless instructed otherwise, I plan to also re-post this as part
of the next (v3) version of [1], and hopefully have the whole series go
through your tree. That would avoid merge conflicts, and as I understand
it, there is no particular urgency for this patch, so we might as well
do it the easy way.

John Hubbard (1):
  IB/umem: use get_user_pages_fast() to pin DMA pages

 drivers/infiniband/core/umem.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

-- 
2.24.0