linux-kernel - Re: [PATCH v3 00/35] Per-VMA locks

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Message-ID: <CAJuCfpH4QuX_BmZor5Gy9M9frwz0e3WP597b4q-W3xYHOqUB8A@mail.gmail.com>
Date:   Mon, 27 Feb 2023 09:22:40 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     freak07 <michalechner92@...glemail.com>, surenb@...gle.com,
        akpm@...ux-foundation.org, arjunroy@...gle.com,
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Subject: Re: [PATCH v3 00/35] Per-VMA locks

On Mon, Feb 27, 2023 at 9:19 AM Davidlohr Bueso <dave@...olabs.net> wrote:
>
> On Fri, 24 Feb 2023, freak07 wrote:
>
> >Here are some measurements from a Pixel 7 Pro that´s running a kernel either with the Per-VMA locks patchset or without.
> >If there´s interest I can provide results of other specific apps as well.
> >
> >Results are from consecutive cold app launches issued with "am start" command spawning the main activity of Slack Android app.
> >
> >https://docs.google.com/spreadsheets/d/1ktujfcyDmIJoQMWsoizGIE-0A_jMS9VMw_seehUY9s0/edit?usp=sharing
> >
> >There´s quite a noticeable improvement, as can be seen in the graph. The results were reproducible.
>
> Thanks for sharing. I am not surprised - after all, per-vma locks narrow some of the performance gaps
> between vanilla and speculative pfs, with less complexity (albeit this is now a 35 patch series :).

Yes, depending on the specific app we would expect some launch time
improvement (in this case average improvement is 7%). Thanks for
sharing the numbers!
I'll be posting v4 today, which is a 33 patch series now, so a bit better :)
Thanks,
Suren.

>
> Thanks,
> Davidlohr
>