Re: [RESEND PATCH v2 02/12] mm: memcontrol: convert NR_ANON_THPS account to pages

From: Johannes Weiner
Date: Thu Dec 10 2020 - 11:15:14 EST


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.