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rcu: Don't scan root rcu_node structure for stalled tasks 

Now that blocked tasks are no longer migrated to the root rcu_node
structure, there is no need to scan the root rcu_node structure for
blocked tasks stalling the current grace period.  This commit therefore
removes this scan.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2014-12-10 07:45:13 -08:00
parent abaf3f9d27
commit 6cd534ef8b
1 changed files with 0 additions and 9 deletions
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9
kernel/rcu/tree.c
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@ -1107,15 +1107,6 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
raw_spin_unlock_irqrestore(&rnp->lock, flags);
}
/*
* Now rat on any tasks that got kicked up to the root rcu_node
* due to CPU offlining.
*/
rnp = rcu_get_root(rsp);
raw_spin_lock_irqsave(&rnp->lock, flags);
ndetected += rcu_print_task_stall(rnp);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
print_cpu_stall_info_end();
for_each_possible_cpu(cpu)
totqlen += per_cpu_ptr(rsp->rda, cpu)->qlen;