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

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Date:   Tue, 23 Oct 2018 07:33:59 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Arun Sudhilal <getarunks@...il.com>
Cc:     Arun KS <arunks@...eaurora.org>, linux-kernel@...r.kernel.org,
        linux-mm <linux-mm@...ck.org>, Minchan Kim <minchan@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Arun Sudhilal <getarunks@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and
 managed_pages to atomic.

[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.
-- 
Michal Hocko
SUSE Labs