diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-10-01 15:54:14 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-11-10 18:39:00 +0100 |
| commit | 14e292f8d45380c519a83d9b0f37089a17eedcdf (patch) | |
| tree | 50b8a4826a5fa1a806304a497930b46e8282d0ae /kernel/sched/deadline.c | |
| parent | 3015ef4b98f53fe7eba4f5f82f562c0e074d213c (diff) | |
sched,rt: Use cpumask_any*_distribute()
Replace a bunch of cpumask_any*() instances with
cpumask_any*_distribute(), by injecting this little bit of random in
cpu selection, we reduce the chance two competing balance operations
working off the same lowest_mask pick the same CPU.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Link: https://lkml.kernel.org/r/20201023102347.190759694@infradead.org
Diffstat (limited to 'kernel/sched/deadline.c')
| -rw-r--r-- | kernel/sched/deadline.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index e97c7c2708bc..206a0703fcbc 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -2002,8 +2002,8 @@ static int find_later_rq(struct task_struct *task) return this_cpu; } - best_cpu = cpumask_first_and(later_mask, - sched_domain_span(sd)); + best_cpu = cpumask_any_and_distribute(later_mask, + sched_domain_span(sd)); /* * Last chance: if a CPU being in both later_mask * and current sd span is valid, that becomes our @@ -2025,7 +2025,7 @@ static int find_later_rq(struct task_struct *task) if (this_cpu != -1) return this_cpu; - cpu = cpumask_any(later_mask); + cpu = cpumask_any_distribute(later_mask); if (cpu < nr_cpu_ids) return cpu; |