Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 11/15] rcu: Add more debug info on "kthread starved" RCU CPU stall warnings | Date | Tue, 12 May 2015 14:38:17 -0700 |
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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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> --- kernel/rcu/tree.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a7615a0b684f..5b573e75e0f8 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1133,8 +1133,9 @@ 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); } /* -- 1.8.1.5
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