linux-kernel - [PATCH 0/3] Add gup fast + longterm and use it in HFI1

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Date:   Mon, 11 Feb 2019 12:16:40 -0800
From:   ira.weiny@...el.com
To:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Daniel Borkmann <daniel@...earbox.net>,
        Davidlohr Bueso <dave@...olabs.net>, netdev@...r.kernel.org
Cc:     Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ira Weiny <ira.weiny@...el.com>
Subject: [PATCH 0/3] Add gup fast + longterm and use it in HFI1

From: Ira Weiny <ira.weiny@...el.com>

NOTE: This series depends on my clean up patch to remove the write parameter
from gup_fast_permitted()[1]

HFI1 uses get_user_pages_fast() due to it performance advantages.  Like RDMA,
HFI1 pages can be held for a significant time.  But get_user_pages_fast() does
not protect against mapping of FS DAX pages.

Introduce a get_user_pages_fast_longterm() which retains the performance while
also adding the FS DAX checks.  XDP has also shown interest in using this
functionality.[2]

[1] https://lkml.org/lkml/2019/2/11/237
[2] https://lkml.org/lkml/2019/2/11/1789

Ira Weiny (3):
  mm/gup: Change "write" parameter to flags
  mm/gup: Introduce get_user_pages_fast_longterm()
  IB/HFI1: Use new get_user_pages_fast_longterm()

 drivers/infiniband/hw/hfi1/user_pages.c |   2 +-
 include/linux/mm.h                      |   8 ++
 mm/gup.c                                | 152 ++++++++++++++++--------
 3 files changed, 114 insertions(+), 48 deletions(-)

-- 
2.20.1