Re: [PATCH] mm: memcontrol: add file_thp, shmem_thp to memory.stat

[Andrew Morton]

On Thu, 22 Oct 2020 11:18:44 -0400 Johannes Weiner <hannes@xxxxxxxxxxx> wrote:

> As huge page usage in the page cache and for shmem files proliferates
> in our production environment, the performance monitoring team has
> asked for per-cgroup stats on those pages.
> 
> We already track and export anon_thp per cgroup. We already track file
> THP and shmem THP per node, so making them per-cgroup is only a matter
> of switching from node to lruvec counters. All callsites are in places
> where the pages are charged and locked, so page->memcg is stable.
> 
> ...
>
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1507,6 +1507,8 @@ static struct memory_stat memory_stats[] = {
>  	 * constant(e.g. powerpc).
>  	 */
>  	{ "anon_thp", 0, NR_ANON_THPS },
> +	{ "file_thp", 0, NR_FILE_THPS },
> +	{ "shmem_thp", 0, NR_SHMEM_THPS },

Documentation/admin-guide/cgroup-v2.rst is owed an update?