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

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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>
This commit is contained in:
Paul E. McKenney 2015-04-16 11:02:25 -07:00
parent 82efed06d5
commit 81e701e437
1 changed files with 3 additions and 2 deletions
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5
kernel/rcu/tree.c
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@ -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);
}
/*