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Date: Mon, 12 Aug 2019 14:20:14 -0700 From: John Hubbard <jhubbard@...dia.com> To: Ira Weiny <ira.weiny@...el.com> CC: Andrew Morton <akpm@...ux-foundation.org>, Jason Gunthorpe <jgg@...pe.ca>, Dan Williams <dan.j.williams@...el.com>, Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>, 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 8/12/19 2:00 PM, Ira Weiny wrote: > On Fri, Aug 09, 2019 at 05:09:54PM -0700, John Hubbard wrote: >> On 8/9/19 3:58 PM, ira.weiny@...el.com wrote: >>> From: Ira Weiny <ira.weiny@...el.com> ... > > At one point I wanted to (and had in my tree) a new flag but I went away from > it. Prior to the discussion on mlock last week I did not think we needed it. > But I'm ok to add it back in. > > I was not ignoring the idea for this RFC I just wanted to get this out there > for people to see. I see that you threw out a couple of patches which add this > flag in. > > FWIW, I think it would be good to differentiate between an indefinite pinned > page vs a referenced "gotten" page. > > What you and I have been working on is the former. So it would be easy to > change your refcounting patches to simply key off of FOLL_PIN. > > Would you like me to add in your FOLL_PIN patches to this series? Sure, that would be perfect. They don't make any sense on their own, and it's all part of the same design idea. thanks, -- John Hubbard NVIDIA
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