Commit 27ba76e1 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Add ->gp_max to show_rcu_gp_kthreads() output 



This commit adds ->gp_max to show_rcu_gp_kthreads() output in order to
better diagnose RCU priority boosting failures.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent e44111ed

kernel/rcu/tree_stall.h

+2 −1
Original line number Diff line number Diff line
@@ -737,12 +737,13 @@ void show_rcu_gp_kthreads(void) 
	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 ->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",

	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_max %lu ->gp_flags %#x\n",

		rcu_state.name, gp_state_getname(rcu_state.gp_state),

		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_max),

		data_race(rcu_state.gp_flags));

	rcu_for_each_node_breadth_first(rnp) {

		if (ULONG_CMP_GE(READ_ONCE(rcu_state.gp_seq),