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Energy-aware load balancing bases on cpu usage so the upper bound of its operational range is a fully utilized cpu. Above this tipping point it makes more sense to use weighted_cpuload to preserve smp_nice. This patch implements the tipping point detection in update_sg_lb_stats as if one cpu is over-utilized the current energy-aware load balance operation will fall back into the conventional weighted load based one. cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
bdd70613