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rcu: Avoid invoking RCU core on offline CPUs

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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>
This commit is contained in:
Paul E. McKenney 2013-02-04 12:14:24 -08:00
parent b5b393601d
commit b0f740360e
1 changed files with 2 additions and 1 deletions
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3
kernel/rcutree.c
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@ -2169,7 +2169,8 @@ static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
static void invoke_rcu_core(void)
{
raise_softirq(RCU_SOFTIRQ);
if (cpu_online(smp_processor_id()))
raise_softirq(RCU_SOFTIRQ);
}
/*