linux-kernel - Re: [RFC PATCH 2/2] mm/gup: introduce vaddr_pin_pages

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Message-ID: <20190815145102.GH21596@ziepe.ca>
Date:   Thu, 15 Aug 2019 11:51:02 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Jan Kara <jack@...e.cz>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] mm/gup: introduce vaddr_pin_pages_remote()

On Thu, Aug 15, 2019 at 03:35:10PM +0200, Jan Kara wrote:

> > 3) ODP case - GUP references to pages serving as DMA buffers, MMU notifiers
> >    used to synchronize with page_mkclean() and munmap() => normal page
> >    references are fine.
> 
> I want to add that I'd like to convert users in cases 1) and 2) from using
> GUP to using differently named function. Users in case 3) can stay as they
> are for now although ultimately I'd like to denote such use cases in a
> special way as well...

3) users also want a special function and path, right now it is called
hmm_range_fault() but perhaps it would be good to harmonize it more
with the GUP infrastructure?

I'm not quite sure what the best plan for that is yet.

Jason