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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-04-16 11:02:25 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-27 12:58:02 -0700
commit81e701e4376232b2779f52f15e3b7413131bd8e4 (patch)
treefd4da2e7259f5e448048c1db7f0276d87ec24ebd /kernel/rcu
parent82efed06d5e370f1526ec93ff4c2c2496542f615 (diff)
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>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 7d369b829598..52f064ac7b49 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -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);
}
/*