Commit 81e701e4 authored Apr 16, 2015 by Paul E. McKenney

rcu: Add more debug info on "kthread starved" RCU CPU stall warnings

This commit adds grace number and command-flags information to the
"kthread starved" message that is sometimes printed out as part of
RCU CPU stall warnings. This message is caused by the corresponding
RCU grace-period kthread not having run for at least two seconds, and
this added information can be helpful when debugging.

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

parent 82efed06

kernel/rcu/tree.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -1136,8 +1136,9 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
		j = jiffies;
		gpa = READ_ONCE(rsp->gp_activity);
		if (j - gpa > 2 * HZ)
		pr_err("%s kthread starved for %ld jiffies!\n",
		rsp->name, j - gpa);
		pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x\n",
		rsp->name, j - gpa,
		rsp->gpnum, rsp->completed, rsp->gp_flags);
		}

		/*

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