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authorPaul E. McKenney <paulmck@kernel.org>2021-04-02 21:51:50 -0700
committerPaul E. McKenney <paulmck@kernel.org>2021-05-10 16:22:54 -0700
commite44111ed20d8b2d7b05b20d694358ae77d4e93e2 (patch)
tree8ea98e197ddff7bb2587cb2bd6ab5dc248431261 /kernel/rcu/tree_stall.h
parent8e4b1d2bc198e34b48fc7cc3a3c5a2fcb269e271 (diff)
downloadlinux-next-e44111ed20d8b2d7b05b20d694358ae77d4e93e2.tar.gz
rcu: Add ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output
This commit adds ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output in order to better diagnose RCU priority boosting failures. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_stall.h')
-rw-r--r--kernel/rcu/tree_stall.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 59b95cc5cbdf..fb4702570316 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -726,6 +726,7 @@ void show_rcu_gp_kthreads(void)
unsigned long j;
unsigned long ja;
unsigned long jr;
+ unsigned long js;
unsigned long jw;
struct rcu_data *rdp;
struct rcu_node *rnp;
@@ -734,11 +735,12 @@ void show_rcu_gp_kthreads(void)
j = jiffies;
ja = j - data_race(rcu_state.gp_activity);
jr = j - data_race(rcu_state.gp_req_activity);
+ js = j - data_race(rcu_state.gp_start);
jw = j - data_race(rcu_state.gp_wake_time);
- pr_info("%s: wait state: %s(%d) ->state: %#lx delta ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n",
+ pr_info("%s: wait state: %s(%d) ->state: %#lx ->rt_priority %u delta ->gp_start %lu ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n",
rcu_state.name, gp_state_getname(rcu_state.gp_state),
- rcu_state.gp_state, t ? t->state : 0x1ffffL,
- ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq),
+ rcu_state.gp_state, t ? t->state : 0x1ffffL, t ? t->rt_priority : 0xffU,
+ js, ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq),
(long)data_race(rcu_state.gp_seq),
(long)data_race(rcu_get_root()->gp_seq_needed),
data_race(rcu_state.gp_flags));