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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>
This commit is contained in:
Paul E. McKenney 2021-04-02 21:51:50 -07:00
parent 8e4b1d2bc1
commit e44111ed20
1 changed files with 5 additions and 3 deletions
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8
kernel/rcu/tree_stall.h
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@ -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));