On Thu, Aug 27, 2020 at 09:40:22PM -0400, Daniel Jordan wrote: > I went back to your v1 post to see what motivated you originally, and you had > some results from aim9 but nothing about where this reared its head in the > first place. How did you discover the bottleneck? I'm just curious about how > lru_lock hurts in practice. I think making lru_lock per-memcg helps in colocated environment: some workloads are of high priority while some workloads are of low priority. For these low priority workloads, we may even want to use some swap for it to save memory and this can cause frequent alloc/reclaim, depending on its workingset etc. and these alloc/reclaim need to hold the global lru lock and zone lock. And then when the high priority workloads do page fault, their performance can be adversely affected and that is not acceptible since these high priority workloads normally have strict SLA requirement.
