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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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-07-18 13:52:18 -07:00
parent a3b7b6c273
commit 96036c4306
1 changed files with 3 additions and 2 deletions
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5
kernel/rcu/tree.c
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@ -1358,12 +1358,13 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
j = jiffies; j = jiffies;
gpa = READ_ONCE(rsp->gp_activity); gpa = READ_ONCE(rsp->gp_activity);
if (j - gpa > 2 * HZ) { 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->name, j - gpa,
rsp->gpnum, rsp->completed, rsp->gpnum, rsp->completed,
rsp->gp_flags, rsp->gp_flags,
gp_state_getname(rsp->gp_state), rsp->gp_state, 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) { if (rsp->gp_kthread) {
sched_show_task(rsp->gp_kthread); sched_show_task(rsp->gp_kthread);
wake_up_process(rsp->gp_kthread); wake_up_process(rsp->gp_kthread);