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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-03-26 22:01:35 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-05 23:16:59 -0700
commitbaa1ae0c9f1c618bc60706efa75fef3508bcee58 (patch)
treee9a4558a3fcef41e42477d6461ccf655d01d5432
parent9ab1544eb4196ca8d05c433b2eb56f74496b1ee3 (diff)
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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: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
-rw-r--r--kernel/rcutree.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 2c07adb..fe85600 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -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);
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