linux-kernel - Re: [PATCH] mm: memcontrol: add file_thp, shmem

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Date:   Sun, 25 Oct 2020 11:37:25 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH] mm: memcontrol: add file_thp, shmem_thp to memory.stat

On Thu, 22 Oct 2020 11:18:44 -0400 Johannes Weiner <hannes@...xchg.org> 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?