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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-06-21 17:10:40 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-08-31 14:44:02 -0700
commiteb75767be0e514f97bf1b5cec763696cfc7f7e2a (patch)
tree08cae2878e46409d6f5cffd0d37499bfa4851abc /kernel/rcutree.c
parent0edd1b1784cbdad55aca2c1293be018f53c0ab1d (diff)
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 <paulmck@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c1
1 files changed, 1 insertions, 0 deletions
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. */