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To be able to identify the least efficient (costliest) sched group introduce group_eff as the efficiency of the sched group into sg_lb_stats. The group efficiency is defined as the ratio between the group usage and the group energy consumption. cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
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