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Commit 96036c43 authored by Paul E. McKenney's avatar Paul E. McKenney
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rcu: Add last-CPU to GP-kthread starvation messages 



This commit augments the grace-period-kthread starvation debugging
messages by adding the last CPU that ran the kthread.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent a3b7b6c2

kernel/rcu/tree.c

+3 −2
Original line number Diff line number Diff line
@@ -1358,12 +1358,13 @@ 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! g%lu c%lu f%#x %s(%d) ->state=%#lx\n",

		pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x %s(%d) ->state=%#lx ->cpu=%d\n",

		       rsp->name, j - gpa,

		       rsp->gpnum, rsp->completed,

		       rsp->gp_flags,

		       gp_state_getname(rsp->gp_state), rsp->gp_state,

		       rsp->gp_kthread ? rsp->gp_kthread->state : ~0);

		       rsp->gp_kthread ? rsp->gp_kthread->state : ~0,

		       rsp->gp_kthread ? task_cpu(rsp->gp_kthread) : -1);

		if (rsp->gp_kthread) {

			sched_show_task(rsp->gp_kthread);

			wake_up_process(rsp->gp_kthread);