On 4/22/20 10:47 PM, Roman Gushchin 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> However, as this series will affect slab fastpaths, and perhaps especially this patch will affect even non-kmemcg allocations being freed, I'm CCing Jesper and Mel for awareness as they AFAIK did work on network stack memory management performance, and perhaps some benchmarks are in order...
