Commit b0f74036 authored Feb 04, 2013 by Paul E. McKenney

rcu: Avoid invoking RCU core on offline CPUs



Offline CPUs transition through the scheduler to the idle loop one
last time before being shut down.  This can result in RCU raising
softirq on this CPU, which is at best useless given that the CPU's
callbacks will be offloaded at CPU_DEAD time.  This commit therefore
avoids raising softirq on offline CPUs.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent b5b39360

kernel/rcutree.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2169,6 +2169,7 @@ static void invoke_rcu_callbacks(struct rcu_state rsp, struct rcu_data rdp)

		static void invoke_rcu_core(void)
		{
		if (cpu_online(smp_processor_id()))
		raise_softirq(RCU_SOFTIRQ);
		}