On Mon, Jun 8, 2020 at 4:07 PM Roman Gushchin <guro@xxxxxx> wrote: > > This is fairly big but mostly red patch, which makes all accounted > slab allocations use a single set of kmem_caches instead of > creating a separate set for each memory cgroup. > > Because the number of non-root kmem_caches is now capped by the number > of root kmem_caches, there is no need to shrink or destroy them > prematurely. They can be perfectly destroyed together with their > root counterparts. This allows to dramatically simplify the > management of non-root kmem_caches and delete a ton of code. > > This patch performs the following changes: > 1) introduces memcg_params.memcg_cache pointer to represent the > kmem_cache which will be used for all non-root allocations > 2) reuses the existing memcg kmem_cache creation mechanism > to create memcg kmem_cache on the first allocation attempt > 3) memcg kmem_caches are named <kmemcache_name>-memcg, > e.g. dentry-memcg > 4) simplifies memcg_kmem_get_cache() to just return memcg kmem_cache > or schedule it's creation and return the root cache > 5) removes almost all non-root kmem_cache management code > (separate refcounter, reparenting, shrinking, etc) > 6) makes slab debugfs to display root_mem_cgroup css id and never > show :dead and :deact flags in the memcg_slabinfo attribute. > > Following patches in the series will simplify the kmem_cache creation. > > Signed-off-by: Roman Gushchin <guro@xxxxxx> > Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx> This is a very satisfying patch. Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
