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sched/fair: Add a few assertions 

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Don Hiatt <dhiatt@digitalocean.com>
Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210422123308.015639083@infradead.org
This commit is contained in:
Peter Zijlstra 2020-11-17 18:19:35 -05:00
parent 0cd7c741f0
commit 9099a14708
1 changed files with 9 additions and 2 deletions
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11
kernel/sched/fair.c
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@ -6288,6 +6288,11 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
task_util = uclamp_task_util(p);
}
/*
* per-cpu select_idle_mask usage
*/
lockdep_assert_irqs_disabled();
if ((available_idle_cpu(target) || sched_idle_cpu(target)) &&
asym_fits_capacity(task_util, target))
return target;
@ -6781,8 +6786,6 @@ unlock:
* 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 wake_flags)
@ -6795,6 +6798,10 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int wake_flags)
/* SD_flags and WF_flags share the first nibble */
int sd_flag = wake_flags & 0xF;
/*
* required for stable ->cpus_allowed
*/
lockdep_assert_held(&p->pi_lock);
if (wake_flags & WF_TTWU) {
record_wakee(p);