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Date:   Mon, 11 Feb 2019 13:40:49 -0700
From:   Jason Gunthorpe <>
Cc:,,, Daniel Borkmann <>,
        Davidlohr Bueso <>,,
        Mike Marciniszyn <>,
        Dennis Dalessandro <>,
        Doug Ledford <>,
        Andrew Morton <>,
        "Kirill A. Shutemov" <>,
        Dan Williams <>
Subject: Re: [PATCH 0/3] Add gup fast + longterm and use it in HFI1

On Mon, Feb 11, 2019 at 12:16:40PM -0800, wrote:
> From: Ira Weiny <>
> 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.

If HFI1 can use the _fast varient, can't all the general RDMA stuff
use it too? 

What is the guidance on when fast vs not fast should be use?


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