On Tue, May 25, 2021 at 6:00 AM Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > > On Mon, May 24, 2021 at 12:53:39PM -0700, Suren Baghdasaryan wrote: > > PSI accounts stalls for each cgroup separately and aggregates it at each > > level of the hierarchy. This causes additional overhead with psi_avgs_work > > being called for each cgroup in the hierarchy. psi_avgs_work has been > > highly optimized, however on systems with large number of cgroups the > > overhead becomes noticeable. > > Systems which use PSI only at the system level could avoid this overhead > > if PSI can be configured to skip per-cgroup stall accounting. > > Add "cgroup_disable=pressure" kernel command-line option to allow > > requesting system-wide only pressure stall accounting. When set, it > > keeps system-wide accounting under /proc/pressure/ but skips accounting > > for individual cgroups and does not expose PSI nodes in cgroup hierarchy. > > > > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> > > Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Gentle ping for cgroup folks to please take a look at the cgroup interface part.
