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-rw-r--r--kernel/sched/fair.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2558ab903..91c101ecf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6656,7 +6656,7 @@ 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;
}
@@ -6664,7 +6664,7 @@ 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;
}
@@ -6678,13 +6678,19 @@ static int select_idle_core(struct task_struct *p, int core, struct cpumask *cpu
/*
* Scan the local SMT mask for idle CPUs.
*/
-static int select_idle_smt(struct task_struct *p, int target)
+static int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
{
int cpu;
for_each_cpu_and(cpu, cpu_smt_mask(target), p->cpus_ptr) {
if (cpu == target)
continue;
+ /*
+ * Check if the CPU is in the LLC scheduling domain of @target.
+ * Due to isolcpus, there is no guarantee that all the siblings are in the domain.
+ */
+ if (!cpumask_test_cpu(cpu, sched_domain_span(sd)))
+ continue;
if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
return cpu;
}
@@ -6708,7 +6714,7 @@ static inline int select_idle_core(struct task_struct *p, int core, struct cpuma
return __select_idle_cpu(core, p);
}
-static inline int select_idle_smt(struct task_struct *p, int target)
+static inline int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
{
return -1;
}
@@ -6970,7 +6976,7 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
has_idle_core = test_idle_cores(target);
if (!has_idle_core && cpus_share_cache(prev, target)) {
- i = select_idle_smt(p, prev);
+ i = select_idle_smt(p, sd, prev);
if ((unsigned int)i < nr_cpumask_bits)
return i;
}