Re: Showing /sys/fs/cgroup/memory/memory.stat very slow on some machines
From: Michal Hocko
Date: Wed Jul 25 2018 - 08:32:41 EST
On Tue 24-07-18 12:05:35, Bruce Merry wrote:
> I've also added some code to memcg_stat_show to report the number of
> cgroups in the hierarchy (iterations in for_each_mem_cgroup_tree).
> Running the script increases it from ~700 to ~41000. The script
> iterates 250,000 times, so only some fraction of the cgroups become
So this is definitely "too many zombies" to delay the collecting of
cumulative stats. Maybe we need to limit the number of zombies and
reclaim them more actively. I have seen Shakeel has posted something but
it looked more on the accounting side from a quick glance.
I can see you are using cgroup v1 so your workaround would be to
memory.force_empty before you remove the group.