On 2019/7/11 下午9:47, Peter Zijlstra wrote: [snip] >> + rcu_read_lock(); >> + memcg = mem_cgroup_from_task(p); >> + if (idx != -1) >> + this_cpu_inc(memcg->stat_numa->locality[idx]); > > I thought cgroups were supposed to be hierarchical. That is, if we have: > > R > / \ > A > /\ > B > \ > t1 > > Then our task t1 should be accounted to B (as you do), but also to A and > R. I get the point but not quite sure about this... Not like pages there are no hierarchical limitation on locality, also tasks running in a particular group have no influence to others, not to mention the extra overhead, does it really meaningful to account the stuff hierarchically? Regards, Michael Wang > >> + rcu_read_unlock(); >> +} >> +#endif
