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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-07-18 13:52:18 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-07-24 16:04:18 -0700
commit96036c43066a04c99353abb4a342cc38a52d36f2 (patch)
treefddf8ad685ec40fc96f87cdbebff859a4833cc04 /kernel/rcu
parenta3b7b6c2739caf996b95a0164b5b4541c27630c3 (diff)
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>
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 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);