Re: [PATCH 3/3] mm: memcontrol: fix cgroup creation failure after many small jobs

Tejun Heo
2016-06-17T18:18:52Z

On Fri, Jun 17, 2016 at 12:25:16PM -0400, Johannes Weiner wrote:
> The memory controller has quite a bit of state that usually outlives
> the cgroup and pins its CSS until said state disappears. At the same
> time it imposes a 16-bit limit on the CSS ID space to economically
> store IDs in the wild. Consequently, when we use cgroups to contain
> frequent but small and short-lived jobs that leave behind some page
> cache, we quickly run into the 64k limitations of outstanding CSSs.
> Creating a new cgroup fails with -ENOSPC while there are only a few,
> or even no user-visible cgroups in existence.

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

--
tejun