On Mon, Jun 22, 2020 at 6:58 PM Roman Gushchin <guro@xxxxxx> wrote: > > Instead of having two sets of kmem_caches: one for system-wide and > non-accounted allocations and the second one shared by all accounted > allocations, we can use just one. > > The idea is simple: space for obj_cgroup metadata can be allocated on > demand and filled only for accounted allocations. > > It allows to remove a bunch of code which is required to handle kmem_cache > clones for accounted allocations. There is no more need to create them, > accumulate statistics, propagate attributes, etc. It's a quite > significant simplification. > > Also, because the total number of slab_caches is reduced almost twice (not > all kmem_caches have a memcg clone), some additional memory savings are > expected. On my devvm it additionally saves about 3.5% of slab memory. > > Suggested-by: Johannes Weiner <hannes@xxxxxxxxxxx> > Signed-off-by: Roman Gushchin <guro@xxxxxx> > Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
