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authorFrederic Weisbecker <frederic@kernel.org>2019-12-03 19:01:06 +0300
committerPeter Zijlstra <peterz@infradead.org>2019-12-17 15:32:50 +0300
commit5443a0be6121d557e12951537e10159e4c61035d (patch)
tree9dc1a41330100d587a3ea7a8f0fdfa13ce0d7b76 /kernel/sched/core.c
parent7c2e8bbd87db661122e92d71a394dd7bb3ada4d3 (diff)
downloadlinux-5443a0be6121d557e12951537e10159e4c61035d.tar.xz
sched: Use fair:prio_changed() instead of ad-hoc implementation
set_user_nice() implements its own version of fair::prio_changed() and therefore misses a specific optimization towards nohz_full CPUs that avoid sending an resched IPI to a reniced task running alone. Use the proper callback instead. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20191203160106.18806-3-frederic@kernel.org
Diffstat (limited to 'kernel/sched/core.c')
-rw-r--r--kernel/sched/core.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 90e4b00ace89..15508c202bf5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4540,17 +4540,17 @@ void set_user_nice(struct task_struct *p, long nice)
p->prio = effective_prio(p);
delta = p->prio - old_prio;
- if (queued) {
+ if (queued)
enqueue_task(rq, p, ENQUEUE_RESTORE | ENQUEUE_NOCLOCK);
- /*
- * If the task increased its priority or is running and
- * lowered its priority, then reschedule its CPU:
- */
- if (delta < 0 || (delta > 0 && task_running(rq, p)))
- resched_curr(rq);
- }
if (running)
set_next_task(rq, p);
+
+ /*
+ * If the task increased its priority or is running and
+ * lowered its priority, then reschedule its CPU:
+ */
+ p->sched_class->prio_changed(rq, p, old_prio);
+
out_unlock:
task_rq_unlock(rq, p, &rf);
}