On Thu, Nov 25, 2021 at 11:24:02AM +0800, Hao Lee wrote: > On Thu, Nov 25, 2021 at 12:31 AM Michal Hocko <mhocko@xxxxxxxx> wrote: > > We do batch currently so no single task should be > > able to monopolize the cpu for too long. Why this is not sufficient? > > uncharge and unref indeed take advantage of the batch process, but > del_from_lru needs more time to complete. Several tasks will contend > spinlock in the loop if nr is very large. Is SWAP_CLUSTER_MAX too large? Or does your architecture's spinlock implementation need to be fixed?
