slab: do not keep free objects/slabs on dead memcg caches

slab: do not keep free objects/slabs on dead memcg caches

Since a dead memcg cache is destroyed only after the last slab allocated
to it is freed, we must disable caching of free objects/slabs for such
caches, otherwise they will be hanging around forever.

For SLAB that means we must disable per cpu free object arrays and make
free_block always discard empty slabs irrespective of node's free_limit.

To disable per cpu arrays, we free them on kmem_cache_shrink (see
drain_cpu_caches -> do_drain) and make __cache_free fall back to
free_block if there is no per cpu array.  Also, we have to disable
allocation of per cpu arrays on cpu hotplug for dead caches (see
cpuup_prepare, __do_tune_cpucache).

After we disabled free objects/slabs caching, there is no need to reap
those caches periodically.  Moreover, it will only result in slowdown.  So
we also make cache_reap skip then.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>