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

[Johannes Weiner]

On Sun, Oct 25, 2020 at 11:37:25AM -0700, Andrew Morton wrote:
> 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?

Ah yes. This?