On Thu, 27 Jun 2019, Roman Gushchin wrote: > so that objects belonging to different memory cgroups can share the same page > and kmem_caches. > > It's a fairly big change though. Could this be done at another level? Put a cgoup pointer into the corresponding structures and then go back to just a single kmen_cache for the system as a whole? You can still account them per cgroup and there will be no cleanup problem anymore. You could scan through a slab cache to remove the objects of a certain cgroup and then the fragmentation problem that cgroups create here will be handled by the slab allocators in the traditional way. The duplication of the kmem_cache was not designed into the allocators but bolted on later.
