From eb75767be0e514f97bf1b5cec763696cfc7f7e2a Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 21 Jun 2013 17:10:40 -0700 Subject: nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU Because RCU's quiescent-state-forcing mechanism is used to drive the full-system-idle state machine, and because this mechanism is executed by RCU's grace-period kthreads, this commit forces these kthreads to run on the timekeeping CPU (tick_do_timer_cpu). To do otherwise would mean that the RCU grace-period kthreads would force the system into non-idle state every time they drove the state machine, which would be just a bit on the futile side. Signed-off-by: Paul E. McKenney Cc: Frederic Weisbecker Cc: Steven Rostedt Cc: Lai Jiangshan Reviewed-by: Josh Triplett --- kernel/rcutree.c | 1 + 1 file changed, 1 insertion(+) (limited to 'kernel/rcutree.c') diff --git a/kernel/rcutree.c b/kernel/rcutree.c index eca70f4469c1..64eaafb6c8f7 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1303,6 +1303,7 @@ static int rcu_gp_init(struct rcu_state *rsp) struct rcu_data *rdp; struct rcu_node *rnp = rcu_get_root(rsp); + rcu_bind_gp_kthread(); raw_spin_lock_irq(&rnp->lock); rsp->gp_flags = 0; /* Clear all flags: New grace period. */ -- cgit v1.2.1