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

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Message-ID: <20201210161029.GI264602@cmpxchg.org>
Date:   Thu, 10 Dec 2020 17:10:29 +0100
From:   Johannes Weiner <hannes@...xchg.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     gregkh@...uxfoundation.org, rafael@...nel.org, adobriyan@...il.com,
        akpm@...ux-foundation.org, mhocko@...nel.org,
        vdavydov.dev@...il.com, hughd@...gle.com, will@...nel.org,
        guro@...com, rppt@...nel.org, tglx@...utronix.de, esyr@...hat.com,
        peterx@...hat.com, krisman@...labora.com, surenb@...gle.com,
        avagin@...nvz.org, elver@...gle.com, rdunlap@...radead.org,
        iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        cgroups@...r.kernel.org
Subject: Re: [RESEND PATCH v2 02/12] mm: memcontrol: convert NR_ANON_THPS
 account to pages

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.