On Tue, Jan 26, 2016 at 01:30:24PM -0800, Andrew Morton wrote:
> On Tue, 26 Jan 2016 15:55:29 -0500 Johannes Weiner <hannes@xxxxxxxxxxx> wrote:
>
> > MEM_CGROUP_STAT_NSTATS is just a delimiter for cgroup1 statistics, not
> > an actual array entry. Reuse it for the first cgroup2 stat entry, like
> > in the event array.
> >
> > ...
> >
> > --- a/include/linux/memcontrol.h
> > +++ b/include/linux/memcontrol.h
> > @@ -51,7 +51,7 @@ enum mem_cgroup_stat_index {
> > MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
> > MEM_CGROUP_STAT_NSTATS,
> > /* default hierarchy stats */
> > - MEMCG_SOCK,
> > + MEMCG_SOCK = MEM_CGROUP_STAT_NSTATS,
> > MEMCG_NR_STAT,
> > };
>
> The code looks a bit odd. How come mem_cgroup_stat_names[] ends with
> "swap"? Should MEMCG_SOCK be in there at all?
It's cgroup1 vs. cgroup2 statistics. I'm using the same array in order
to use the original statistics infrastructure. It's a little weird, it
will be much cleaner once everything is converted to percpu_counter.
> And the naming is a bit sad. "MEM_CGROUP_STAT_FILE_MAPPED" maps to
> "mapped_file", not "file_mapped".
MEM_CGROUP_STAT_FILE_MAPPED is named after NR_FILE_MAPPED because
they're both accounted from the same sites. Who knows why the
user-visible stat was then called mapped_file... :/
And in cgroup2 it's called file_mapped! At least there it'll be
consistent.
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