linux-kernel - Re: [RFC PATCH v2 15/19] mm/gup: Introduce vaddr_pin

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Message-ID: <20190812122814.GC24457@ziepe.ca>
Date:   Mon, 12 Aug 2019 09:28:14 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     ira.weiny@...el.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Theodore Ts'o <tytso@....edu>,
        John Hubbard <jhubbard@...dia.com>,
        Michal Hocko <mhocko@...e.com>,
        Dave Chinner <david@...morbit.com>, linux-xfs@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-ext4@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH v2 15/19] mm/gup: Introduce vaddr_pin_pages()

On Fri, Aug 09, 2019 at 03:58:29PM -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The addition of FOLL_LONGTERM has taken on additional meaning for CMA
> pages.
> 
> In addition subsystems such as RDMA require new information to be passed
> to the GUP interface to track file owning information.  As such a simple
> FOLL_LONGTERM flag is no longer sufficient for these users to pin pages.
> 
> Introduce a new GUP like call which takes the newly introduced vaddr_pin
> information.  Failure to pass the vaddr_pin object back to a vaddr_put*
> call will result in a failure if pins were created on files during the
> pin operation.

Is this a 'vaddr' in the traditional sense, ie does it work with
something returned by valloc?

Maybe another name would be better?

I also wish GUP like functions took in a 'void __user *' instead of
the unsigned long to make this clear :\

Jason