linux-kernel - Re: [PATCH v1 00/15] mm: COW fixes part 2: reliable GUP pins of anonymous pages

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Message-ID: <f2b40094-0117-e9f0-7dd8-375bed12fd6e@redhat.com>
Date:   Thu, 10 Mar 2022 12:57:48 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Yang Shi <shy828301@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Michal Hocko <mhocko@...nel.org>,
        Nadav Amit <namit@...are.com>, Rik van Riel <riel@...riel.com>,
        Roman Gushchin <guro@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Donald Dutile <ddutile@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Oleg Nesterov <oleg@...hat.com>, Jan Kara <jack@...e.cz>,
        Liang Zhang <zhangliang5@...wei.com>,
        Pedro Gomes <pedrodemargomes@...il.com>,
        Linux-MM <linux-mm@...ck.org>,
        Khalid Aziz <khalid.aziz@...cle.com>
Subject: Re: [PATCH v1 00/15] mm: COW fixes part 2: reliable GUP pins of
 anonymous pages

On 10.03.22 12:13, Oded Gabbay wrote:
> On Wed, Mar 9, 2022 at 10:00 AM David Hildenbrand <david@...hat.com> wrote:
>>
>> On 08.03.22 22:22, Linus Torvalds wrote:
>>> On Tue, Mar 8, 2022 at 6:14 AM David Hildenbrand <david@...hat.com> wrote:
>>>>
>>>> This series fixes memory corruptions when a GUP pin (FOLL_PIN) was taken
>>>> on an anonymous page and COW logic fails to detect exclusivity of the page
>>>> to then replacing the anonymous page by a copy in the page table [...]
>>>
>>> From a cursory scan of the patches, this looks sane.
>>
>> Thanks for skimming over the patches that quickly!
>>
>>>
>>> I'm not sure what the next step should be, but I really would like the
>>> people who do a lot of pinning stuff to give it a good shake-down.
>>> Including both looking at the patches, but very much actually running
>>> it on whatever test-cases etc you people have.
>>>
>>> Please?
> 
> I can take this patch-set and test it in our data-center with all the
> DL workloads we are running
> on Gaudi.

Perfect!

> 
> David,
> Any chance you can prepare me a branch with your patch-set based on 5.17-rc7 ?
> I prefer to take a stable kernel and not 5.18-rc1 as this is going to
> run on hundreds of machines.

https://github.com/davidhildenbrand/linux/tree/cow_fixes_part_2_v1

contains the state of this series, based on v5.17-rc7 and part 1.

I'll be leaving that branch unmodified when working on newer versions of
the patch set.

-- 
Thanks,

David / dhildenb