linux-ext4 - Re: [PATCH v2 03/11] mm/gup: migrate PIN_LONGTERM dev coherent pages to system

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Message-ID: <117075453.Ddeq1f3ylz@nvdebian>
Date:   Thu, 9 Dec 2021 12:45:24 +1100
From:   Alistair Popple <apopple@...dia.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     <akpm@...ux-foundation.org>, <Felix.Kuehling@....com>,
        <linux-mm@...ck.org>, <rcampbell@...dia.com>,
        <linux-ext4@...r.kernel.org>, <linux-xfs@...r.kernel.org>,
        Alex Sierra <alex.sierra@....com>,
        <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <hch@....de>, <jglisse@...hat.com>, <willy@...radead.org>
Subject: Re: [PATCH v2 03/11] mm/gup: migrate PIN_LONGTERM dev coherent pages to system

On Thursday, 9 December 2021 12:53:45 AM AEDT Jason Gunthorpe wrote:
> > I think a similar problem exists for device private fault handling as well and
> > it has been on my list of things to fix for a while. I think the solution is to
> > call try_get_page(), except it doesn't work with device pages due to the whole
> > refcount thing. That issue is blocking a fair bit of work now so I've started
> > looking into it.
> 
> Where is this?
 
Nothing posted yet. I've been going through the mailing list and the old
thread[1] to get an understanding of what is left to do. If you have any
suggestions they would be welcome.

[1] https://lore.kernel.org/all/20211014153928.16805-3-alex.sierra@amd.com/