sched/uclamp: Cater for uclamp in find_energy_efficient_cpu()'s early exit condition

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If the utilization of the woken up task is 0, we skip the energy
calculation because it has no impact.

But if the task is boosted (uclamp_min != 0) will have an impact on task
placement and frequency selection. Only skip if the util is truly
0 after applying uclamp values.

Change uclamp_task_cpu() signature to avoid unnecessary additional calls
to uclamp_eff_get(). feec() is the only user now.

Fixes: 732cd75b8c ("sched/fair: Select an energy-efficient CPU on task wake-up")
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220804143609.515789-8-qais.yousef@arm.com

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Qais Yousef 2022-08-04 15:36:07 +01:00 • committed by Peter Zijlstra

parent c56ab1b350

commit d81304bc61

1 changed files with 8 additions and 6 deletions

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kernel/sched/fair.c

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