rcu: Detect stalls caused by failure to propagate up rcu_node tree
If all CPUs have passed through quiescent states, then stalls might be due to starvation of the grace-period kthread or to failure to propagate the quiescent states up the rcu_node combining tree. The current stall warning messages do not differentiate, so this commit adds a printout of the root rcu_node structure's ->qsmask field. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -1196,9 +1196,10 @@ static void print_other_cpu_stall(struct rcu_state *rsp, unsigned long gpnum)
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} else {
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j = jiffies;
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gpa = ACCESS_ONCE(rsp->gp_activity);
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pr_err("All QSes seen, last %s kthread activity %ld (%ld-%ld), jiffies_till_next_fqs=%ld\n",
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pr_err("All QSes seen, last %s kthread activity %ld (%ld-%ld), jiffies_till_next_fqs=%ld, root ->qsmask %#lx\n",
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rsp->name, j - gpa, j, gpa,
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jiffies_till_next_fqs);
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jiffies_till_next_fqs,
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rcu_get_root(rsp)->qsmask);
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/* In this case, the current CPU might be at fault. */
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sched_show_task(current);
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}
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