rcu: refer RCU CPU stall-warning victims to stallwarn.txt
There is some documentation on RCU CPU stall warnings contained in Documentation/RCU/stallwarn.txt, but it will not be apparent to someone who runs into such a warning while under time pressure. This commit therefore adds comments preceding the printk()s pointing out the location of this documentation. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -487,8 +487,11 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
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rcu_print_task_stall(rnp);
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raw_spin_unlock_irqrestore(&rnp->lock, flags);
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/* OK, time to rat on our buddy... */
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/*
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* OK, time to rat on our buddy...
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* See Documentation/RCU/stallwarn.txt for info on how to debug
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* RCU CPU stall warnings.
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*/
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printk(KERN_ERR "INFO: %s detected stalls on CPUs/tasks: {",
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rsp->name);
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rcu_for_each_leaf_node(rsp, rnp) {
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@ -517,6 +520,11 @@ static void print_cpu_stall(struct rcu_state *rsp)
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unsigned long flags;
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struct rcu_node *rnp = rcu_get_root(rsp);
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/*
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* OK, time to rat on ourselves...
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* See Documentation/RCU/stallwarn.txt for info on how to debug
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* RCU CPU stall warnings.
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*/
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printk(KERN_ERR "INFO: %s detected stall on CPU %d (t=%lu jiffies)\n",
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rsp->name, smp_processor_id(), jiffies - rsp->gp_start);
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trigger_all_cpu_backtrace();
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