Man page 9 : find_busiest_group

find_busiest_group - Returns the busiest group within the sched_domain if there is an imbalance. If there isnAqt 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 , int *  balance );

env
    The load balancing environment.

balance
    Pointer to a variable indicating if this_cpu is the appropriate cpu to perform load balancing at this_level.

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.