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Commit baa1ae0c authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
Browse files

rcu: further lower priority in rcu_yield() 



Although rcu_yield() dropped from real-time to normal priority, there
is always the possibility that the competing tasks have been niced.
So nice to 19 in rcu_yield() to help ensure that other tasks have a
better chance of running.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 9ab1544e

kernel/rcutree.c

+1 −0
Original line number Diff line number Diff line
@@ -1561,6 +1561,7 @@ static void rcu_yield(void (*f)(unsigned long), unsigned long arg) 
	mod_timer(&yield_timer, jiffies + 2);

	sp.sched_priority = 0;

	sched_setscheduler_nocheck(current, SCHED_NORMAL, &sp);

	set_user_nice(current, 19);

	schedule();

	sp.sched_priority = RCU_KTHREAD_PRIO;

	sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);