linux-kernel - Re: [External] Re: [RESEND PATCH v2 02/12] mm: memcontrol: convert NR_ANON

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Message-ID: <CAMZfGtWBqR=__CLL_nsXUAOirT8mrgCjh8BTipNH_H2qUijixA@mail.gmail.com>
Date:   Fri, 11 Dec 2020 01:05:57 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Hugh Dickins <hughd@...gle.com>, Will Deacon <will@...nel.org>,
        Roman Gushchin <guro@...com>, Mike Rapoport <rppt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, esyr@...hat.com,
        peterx@...hat.com, krisman@...labora.com,
        Suren Baghdasaryan <surenb@...gle.com>, avagin@...nvz.org,
        Marco Elver <elver@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>
Subject: Re: [External] Re: [RESEND PATCH v2 02/12] mm: memcontrol: convert
 NR_ANON_THPS account to pages

On Fri, Dec 11, 2020 at 12:12 AM Johannes Weiner <hannes@...xchg.org> wrote:
>
> On Sun, Dec 06, 2020 at 06:14:41PM +0800, Muchun Song wrote:
> > @@ -1144,7 +1144,8 @@ void do_page_add_anon_rmap(struct page *page,
> >                * disabled.
> >                */
> >               if (compound)
> > -                     __inc_lruvec_page_state(page, NR_ANON_THPS);
> > +                     __mod_lruvec_page_state(page, NR_ANON_THPS,
> > +                                             HPAGE_PMD_NR);
> >               __mod_lruvec_page_state(page, NR_ANON_MAPPED, nr);
>
> What I mistakenly wrote about the previous patch applies to this and
> the following patches, though:
>
> /proc/vmstat currently prints number of anon, file and shmem THPs; you
> are changing it to print number of 4k pages in those THPs.
>
> That's an ABI change we cannot really do.

Agree. Sorry. I forgot to fix the /proc/vmstat. Thanks for your
reminder.


-- 
Yours,
Muchun