Shailabh Nagar wrote:

Yes. If no one registers to listen on a particular CPU, data from tasks
exiting on that cpu is not sent out at all.

Shailabh also wrote:

During task exit, kernel goes through each registered listener (small 
list) and decides which
one needs to get this exit data and calls a genetlink_unicast to each 
one that does need it.

Are we eliminating multicast taskstats data at exit time? A unicast
exit data with cpumask will do for me, but just like to be sure where
we are.

Thanks,
 - jay