[RFC][PATCH 14/16] sched/fair: Add a few assertions

Peter Zijlstra
2019-02-18T17:40:55Z

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6208,6 +6208,11 @@ static int select_idle_sibling(struct ta
struct sched_domain *sd;
int i, recent_used_cpu;

+ /*
+ * per-cpu select_idle_mask usage
+ */
+ lockdep_assert_irqs_disabled();
+
if (available_idle_cpu(target))
return target;

@@ -6635,8 +6640,6 @@ static int find_energy_efficient_cpu(str
* certain conditions an idle sibling CPU if the domain has SD_WAKE_AFFINE set.
*
* Returns the target CPU number.
- *
- * preempt must be disabled.
*/
static int
select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_flags)
@@ -6647,6 +6650,11 @@ select_task_rq_fair(struct task_struct *
int want_affine = 0;
int sync = (wake_flags & WF_SYNC) && !(current->flags & PF_EXITING);

+ /*
+ * required for stable ->cpus_allowed
+ */
+ lockdep_assert_held(&p->pi_lock);
+
if (sd_flag & SD_BALANCE_WAKE) {
record_wakee(p);