On Tue, Nov 10, 2020 at 02:07:58PM -0800, Roman Gushchin wrote: > The non-hierarchical cgroup v1 mode is a legacy of early days > of the memory controller and doesn't bring any value today. > However, it complicates the code and creates many edge cases > all over the memory controller code. > > It's a good time to deprecate it completely. > > Functionally this patch enabled is by default for all cgroups > and forbids switching it off. Nothing changes if cgroup v2 is used: > hierarchical mode was enforced from scratch. > > To protect the ABI memory.use_hierarchy interface is preserved > with a limited functionality: reading always returns "1", writing > of "1" passes silently, writing of any other value fails with > -EINVAL and a warning to dmesg (on the first occasion). > > Signed-off-by: Roman Gushchin <guro@xxxxxx> > Acked-by: Michal Hocko <mhocko@xxxxxxxx> > Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx> > Acked-by: David Rientjes <rientjes@xxxxxxxxxx> ...and don't let the door hit you on the way out ;-) Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
