On Wed 26-02-20 16:12:23, Yang Shi wrote: [...] > Actually I'm wondering if we really need account CPU cycles used by > background reclaimer or not. For our usecase (this may be not general), the > purpose of background reclaimer is to avoid latency sensitive workloads get > into direct relcaim (avoid the stall from direct relcaim). In fact it just > "steal" CPU cycles from lower priority or best-effort workloads to guarantee > latency sensitive workloads behave well. If the "stolen" CPU cycles are > accounted, it means the latency sensitive workloads would get throttled from > somewhere else later, i.e. by CPU share. I believe we need to because that work is not for free and so you are essentially stealing those CPUs cycles from everybody else outside of your throttled cgroup. -- Michal Hocko SUSE Labs
