find_busiest_group
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## Name

find_busiest_group — Returns the busiest group within the sched_domain if there is an imbalance. If there isn't 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.

## Synopsis

`struct sched_group * find_busiest_group (` | struct lb_env * env`)`;

## Arguments

`env`

  The load balancing environment.

## Description

Also calculates the amount of weighted load which should be moved to restore balance.

## Return

- 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.

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