Commit 4e2c7c39 authored Jun 13, 2020 by Pavankumar Kondeti

sched/fair: Depend on sched_asym_cpucapacity for new ilb



We have made the new idle CPU selection for load balance energy
aware. For example, if a silver CPU does not have any misfit
tasks but is overloaded, we have to select a silver CPU not
gold CPU. However, this extra checks are needed only when the
system has asymmetric capacity CPUs. So we should depend on
sched_asym_cpucapacity feature instead of sched_energy_present.
Later patches enable sched_energy_present for SMP systems also.

Change-Id: Ie4fae9d1c17511f15b48b92dd61395d1689e1612
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

parent e635aa26

kernel/sched/fair.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -10708,11 +10708,15 @@ static inline int find_new_ilb(void)
		{
		int ilb;

		if (sched_energy_enabled())
		if (static_branch_likely(&sched_asym_cpucapacity))
		return find_energy_aware_new_ilb();

		for_each_cpu_and(ilb, nohz.idle_cpus_mask,
		housekeeping_cpumask(HK_FLAG_MISC)) {
		#ifdef CONFIG_SCHED_WALT
		if (cpu_isolated(ilb))
		continue;
		#endif
		if (idle_cpu(ilb))
		return ilb;
		}