linux-kernel - Re: [PATCH v4 00/33] Per-VMA locks

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Date:   Tue, 11 Jul 2023 09:35:13 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Sachin Sant <sachinp@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [PATCH v4 00/33] Per-VMA locks

On Tue, Jul 11, 2023 at 4:09 AM Leon Romanovsky <leon@...nel.org> wrote:
>
> On Tue, Jul 11, 2023 at 02:01:41PM +0300, Leon Romanovsky wrote:
> > On Tue, Jul 11, 2023 at 12:39:34PM +0200, Vlastimil Babka wrote:
> > > On 7/11/23 12:35, Leon Romanovsky wrote:
> > > >
> > > > On Mon, Feb 27, 2023 at 09:35:59AM -0800, Suren Baghdasaryan wrote:
> > > >
> > > > <...>
> > > >
> > > >> Laurent Dufour (1):
> > > >>   powerc/mm: try VMA lock-based page fault handling first
> > > >
> > > > Hi,
> > > >
> > > > This series and specifically the commit above broke docker over PPC.
> > > > It causes to docker service stuck while trying to activate. Revert of
> > > > this commit allows us to use docker again.
> > >
> > > Hi,
> > >
> > > there have been follow-up fixes, that are part of 6.4.3 stable (also
> > > 6.5-rc1) Does that version work for you?
> >
> > I'll recheck it again on clean system, but for the record:
> > 1. We are running 6.5-rc1 kernels.
> > 2. PPC doesn't compile for us on -rc1 without this fix.
> > https://lore.kernel.org/all/20230629124500.1.I55e2f4e7903d686c4484cb23c033c6a9e1a9d4c4@changeid/
>
> Ohh, I see it in -rc1, let's recheck.

Hi Leon,
Please let us know how it goes.

>
> > 3. I didn't see anything relevant -rc1 with "git log arch/powerpc/mm/fault.c".

The fixes Vlastimil was referring to are not in the fault.c, they are
in the main mm and fork code. More specifically, check for these
patches to exist in the branch you are testing:

mm: lock newly mapped VMA with corrected ordering
fork: lock VMAs of the parent process when forking
mm: lock newly mapped VMA which can be modified after it becomes visible
mm: lock a vma before stack expansion

Thanks,
Suren.

> >
> > Do you have in mind anything specific to check?
> >
> > Thanks
> >
>
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