Returns the busiest group within the sched_domain if there is an imbalance. if there isnt an imbalance, and the user has opted for power-savings, it returns a group whose cpus can be put to idle by rebalancing those tasks elsewhere, if such a group exists.
struct sched_group * find_busiest_group(struct lb_env * env);
env
The load balancing environment.
Also calculates the amount of weighted load which should be moved to restore balance.
- The busiest group if imbalance exists. - If no imbalance and user has opted for power-savings balance, return the least loaded group whose CPUs can be put to idle by rebalancing its tasks onto our group.