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Groups > linux.kernel > #1695202

[PATCH tip/core/rcu 12/13] rcu: Add last-CPU to GP-kthread starvation messages

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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>
---
 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 51d4c3acf32d..48c6ab5ca164 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -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);
-- 
2.5.2

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[PATCH tip/core/rcu 0/13] Torture-test updates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 09/13] rcutorture: Use nr_cpus rather than maxcpus to limit test size "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 11/13] rcutorture: Eliminate unused ts_rem local from rcu_trace_clock_local() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 12/13] rcu: Add last-CPU to GP-kthread starvation messages "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 13/13] rcutorture: Invoke call_rcu() from timer handler "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 06/13] rcutorture: Don't wait for kernel when all builds fail "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 05/13] torture: Add --kconfig argument to kvm.sh "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 07/13] rcutorture: Enable SRCU readers from timer handler "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 01/13] rcutorture: Move SRCU status printing to SRCU implementations "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 08/13] rcutorture: Place event-traced strings into trace buffer "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 02/13] rcutorture: Print SRCU lock/unlock totals "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200

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