sched: hmp: Make idle balance behaviour normal when packing disabled

The presence of packing permanently changed the idle balance
behaviour. Do not restrict idle balance on the smallest CPUs when
packing is present but disabled.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 383cd134705ae72eebb157689abcd60527796726..28debe3047b5f2eddcb368558cd4221c0336b812 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6350,6 +6350,10 @@ static int hmp_packing_ilb_needed(int cpu)
        if (!hmp_cpu_is_slowest(cpu))
                return 1;
 
+       /* if disabled, use normal ILB behaviour */
+       if (!hmp_packing_enabled)
+               return 1;
+
        hmp = hmp_cpu_domain(cpu);
        for_each_cpu_and(cpu, &hmp->cpus, nohz.idle_cpus_mask) {
                /* only idle balance if a CPU is loaded over threshold */