linux-kernel - Re: [PATCH 0/3] mm/gup: track FOLL

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Message-ID: <7a15be06-d136-ff30-da91-413f0a6c8751@nvidia.com>
Date:   Wed, 29 Jan 2020 12:01:47 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <linux-doc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] mm/gup: track FOLL_PIN pages (follow on from v12)

On 1/28/20 9:47 PM, Leon Romanovsky wrote:
> On Sat, Jan 25, 2020 at 06:23:39PM +0200, Leon Romanovsky wrote:
>> On Fri, Jan 24, 2020 at 06:11:12PM -0800, John Hubbard wrote:
>>> Leon Romanovsky:
>>>
>>> If you get a chance, I'd love to have this short series (or even just
>>> the first patch; the others are just selftests) run through your test
>>> suite that was previously choking on my earlier v11 patchset. The huge
>>> page pincount limitations are removed, so I'm expecting a perfect test
>>> run this time!
>>>
>>
>> I added those patches to our regression and I will post the in the
>> couple of days.
> 
> Hi John,
> 
> The patches survived our RDMA verification night runs.
> 

Great! Thanks very much for running those. That's a pretty solid 
confirmation that the earlier patch *did* allow a huge page refcount
overflow, and that this approach avoids it. 

thanks,
-- 
John Hubbard
NVIDIA