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/rt.c | |
| parent | sched/core: Make migrate disable and CPU hotplug cooperative (diff) | |
| download | linux-dev-14e292f8d45380c519a83d9b0f37089a17eedcdf.tar.xz linux-dev-14e292f8d45380c519a83d9b0f37089a17eedcdf.zip | |
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/rt.c')
| -rw-r--r-- | kernel/sched/rt.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 40a46639f78a..2525a1beed26 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1752,8 +1752,8 @@ static int find_lowest_rq(struct task_struct *task) return this_cpu; } - best_cpu = cpumask_first_and(lowest_mask, - sched_domain_span(sd)); + best_cpu = cpumask_any_and_distribute(lowest_mask, + sched_domain_span(sd)); if (best_cpu < nr_cpu_ids) { rcu_read_unlock(); return best_cpu; @@ -1770,7 +1770,7 @@ static int find_lowest_rq(struct task_struct *task) if (this_cpu != -1) return this_cpu; - cpu = cpumask_any(lowest_mask); + cpu = cpumask_any_distribute(lowest_mask); if (cpu < nr_cpu_ids) return cpu; |