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rcu: Add state name to show_rcu_gp_kthreads() output 

This commit adds the name of the RCU grace-period state to
the show_rcu_gp_kthreads() output in order to ease debugging.
This commit also moves gp_state_getname() up in the code so that
show_rcu_gp_kthreads() can use it.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-10-02 11:24:08 -07:00
parent 791416c471
commit 691960197e
1 changed files with 13 additions and 12 deletions
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25
kernel/rcu/tree.c
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@ -499,6 +499,16 @@ void rcu_force_quiescent_state(void)
}
EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
/*
* Convert a ->gp_state value to a character string.
*/
static const char *gp_state_getname(short gs)
{
if (gs < 0 || gs >= ARRAY_SIZE(gp_state_names))
return "???";
return gp_state_names[gs];
}
/*
* Show the state of the grace-period kthreads.
*/
@ -508,8 +518,9 @@ void show_rcu_gp_kthreads(void)
struct rcu_data *rdp;
struct rcu_node *rnp;
pr_info("%s: wait state: %d ->state: %#lx\n", rcu_state.name,
rcu_state.gp_state, rcu_state.gp_kthread->state);
pr_info("%s: wait state: %s(%d) ->state: %#lx\n", rcu_state.name,
gp_state_getname(rcu_state.gp_state), rcu_state.gp_state,
rcu_state.gp_kthread->state);
rcu_for_each_node_breadth_first(rnp) {
if (ULONG_CMP_GE(rcu_state.gp_seq, rnp->gp_seq_needed))
continue;
@ -1142,16 +1153,6 @@ static void record_gp_stall_check_time(void)
rcu_state.n_force_qs_gpstart = READ_ONCE(rcu_state.n_force_qs);
}
/*
* Convert a ->gp_state value to a character string.
*/
static const char *gp_state_getname(short gs)
{
if (gs < 0 || gs >= ARRAY_SIZE(gp_state_names))
return "???";
return gp_state_names[gs];
}
/*
* Complain about starvation of grace-period kthread.
*/