linux-kernel - Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and managed

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Message-ID: <CABOM9Zr48HTphfbmk9v7a3A+cqzrAFZT71pEyvvseV8PpbWOhg@mail.gmail.com>
Date:   Tue, 23 Oct 2018 12:41:19 +0530
From:   Arun Sudhilal <getarunks@...il.com>
To:     julia.lawall@...6.fr
Cc:     mhocko@...nel.org, arunks@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        minchan@...nel.org, mhocko@...e.com, gregkh@...uxfoundation.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and
 managed_pages to atomic.

On Tue, Oct 23, 2018 at 12:11 PM Julia Lawall <julia.lawall@...6.fr> wrote:
>
>
>
> On Tue, 23 Oct 2018, Michal Hocko wrote:
>
> > [Trimmed CC list + Julia - there is indeed no need to CC everybody maintain a
> > file you are updating for the change like this]
> >
> > On Tue 23-10-18 10:16:51, Arun Sudhilal wrote:
> > > On Mon, Oct 22, 2018 at 11:41 PM Michal Hocko <mhocko@...nel.org> wrote:
> > > >
> > > > On Mon 22-10-18 22:53:22, Arun KS wrote:
> > > > > Remove managed_page_count_lock spinlock and instead use atomic
> > > > > variables.
> > > >
> > >
> > > Hello Michal,
> > > > I assume this has been auto-generated. If yes, it would be better to
> > > > mention the script so that people can review it and regenerate for
> > > > comparision. Such a large change is hard to review manually.
> > >
> > > Changes were made partially with script.  For totalram_pages and
> > > totalhigh_pages,
> > >
> > > find dir -type f -exec sed -i
> > > 's/totalram_pages/atomic_long_read(\&totalram_pages)/g' {} \;
> > > find dir -type f -exec sed -i
> > > 's/totalhigh_pages/atomic_long_read(\&totalhigh_pages)/g' {} \;
> > >
> > > For managed_pages it was mostly manual edits after using,
> > > find mm/ -type f -exec sed -i
> > > 's/zone->managed_pages/atomic_long_read(\&zone->managed_pages)/g' {}
> > > \;
> >
> > I guess we should be able to use coccinelle for this kind of change and
> > reduce the amount of manual intervention to absolute minimum.
>
> Coccinelle looks like it would be desirable, especially in case the word
> zone is not always used.
>
> Arun, please feel free to contact me if you want to try it and need help.

Thanks Julia. I m starting with,
http://coccinelle.lip6.fr/papers/backport_edcc15.pdf

Regards,
Arun
>
> julia