linux-kernel - Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA

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Message-ID: <CAJuCfpEv--awCY0=R3h5Fez8x74U1EZCzNkq4_7deCYqej5sSA@mail.gmail.com>
Date:   Tue, 10 Jan 2023 16:44:42 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org,
        michel@...pinasse.org, jglisse@...gle.com, mhocko@...e.com,
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Subject: Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK

On Tue, Jan 10, 2023 at 4:39 PM Davidlohr Bueso <dave@...olabs.net> wrote:
>
> On Mon, 09 Jan 2023, Suren Baghdasaryan wrote:
>
> >This configuration variable will be used to build the support for VMA
> >locking during page fault handling.
> >
> >This is enabled by default on supported architectures with SMP and MMU
> >set.
> >
> >The architecture support is needed since the page fault handler is called
> >from the architecture's page faulting code which needs modifications to
> >handle faults under VMA lock.
>
> I don't think that per-vma locking should be something that is user-configurable.
> It should just be depdendant on the arch. So maybe just remove CONFIG_PER_VMA_LOCK?

Thanks for the suggestion! I would be happy to make that change if
there are no objections. I think the only pushback might have been the
vma size increase but with the latest optimization in the last patch
maybe that's less of an issue?

>
> Thanks,
> Davidlohr
>
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