linux-kernel - Re: [PATCH 13/41] mm: introduce vma->vm

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Date:   Wed, 11 Jan 2023 13:23:35 -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,
        vbabka@...e.cz, hannes@...xchg.org, mgorman@...hsingularity.net,
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        leewalsh@...gle.com, posk@...gle.com, linux-mm@...ck.org,
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        linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH 13/41] mm: introduce vma->vm_flags modifier functions

On Wed, Jan 11, 2023 at 12:19 PM Davidlohr Bueso <dave@...olabs.net> wrote:
>
> On Wed, 11 Jan 2023, Suren Baghdasaryan wrote:
>
> >On Wed, Jan 11, 2023 at 8:13 AM Davidlohr Bueso <dave@...olabs.net> wrote:
> >>
> >> On Mon, 09 Jan 2023, Suren Baghdasaryan wrote:
> >>
> >> >To keep vma locking correctness when vm_flags are modified, add modifier
> >> >functions to be used whenever flags are updated.
> >>
> >> How about moving this patch and the ones that follow out of this series,
> >> into a preliminary patchset? It would reduce the amount of noise in the
> >> per-vma lock changes, which would then only be adding the needed
> >> vma_write_lock()ing.
> >
> >How about moving those prerequisite patches to the beginning of the
> >patchset (before maple_tree RCU changes)? I feel like they do belong
> >in the patchset because as a standalone patchset it would be unclear
> >why I'm adding all these accessor functions and introducing this
> >churn. Would that be acceptable?
>
> imo the abstraction of vm_flags handling is worth being standalone and is
> easier to be picked up before a more complex locking scheme change. But
> either way, it's up to you.

I see your point. Ok, if you think it makes sense as a stand-alone
patch I can post it separately in the next version.
Thanks,
Suren.

>
> Thanks,
> Davidlohr
>
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