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sched/fair: Take the scheduling domain into account in select_idle_core() 

When picking a CPU on task wakeup, select_idle_core() has to take
into account the scheduling domain where the function looks for the CPU.

This is because the "isolcpus" kernel command line option can remove CPUs
from the domain to isolate them from other SMT siblings.

This change replaces the set of CPUs allowed to run the task from
p->cpus_ptr by the intersection of p->cpus_ptr and sched_domain_span(sd)
which is stored in the 'cpus' argument provided by select_idle_cpu().

Fixes: 9fe1f127b9 ("sched/fair: Merge select_idle_core/cpu()")
Signed-off-by: Keisuke Nishimura <keisuke.nishimura@inria.fr>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240110131707.437301-2-keisuke.nishimura@inria.fr
This commit is contained in:
Keisuke Nishimura 2024-01-10 14:17:07 +01:00 committed by Ingo Molnar
parent 8aeaffef8c
commit 23d04d8c6b
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/fair.c
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@ -7289,7 +7289,7 @@ static int select_idle_core(struct task_struct *p, int core, struct cpumask *cpu
if (!available_idle_cpu(cpu)) {
idle = false;
if (*idle_cpu == -1) {
if (sched_idle_cpu(cpu) && cpumask_test_cpu(cpu, p->cpus_ptr)) {
if (sched_idle_cpu(cpu) && cpumask_test_cpu(cpu, cpus)) {
*idle_cpu = cpu;
break;
}
@ -7297,7 +7297,7 @@ static int select_idle_core(struct task_struct *p, int core, struct cpumask *cpu
}
break;
}
if (*idle_cpu == -1 && cpumask_test_cpu(cpu, p->cpus_ptr))
if (*idle_cpu == -1 && cpumask_test_cpu(cpu, cpus))
*idle_cpu = cpu;
}