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rcu: Add jiffies-since-GP-activity to show_rcu_gp_kthreads() 

This commit adds a printout of the number of jiffies since the last time
that the RCU grace-period kthread did any processing.  This can be useful
when tracking down forward-progress issues.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-10-02 12:42:21 -07:00
parent 691960197e
commit c669c014d1
1 changed files with 5 additions and 3 deletions
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8
kernel/rcu/tree.c
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@ -515,12 +515,14 @@ static const char *gp_state_getname(short gs)
void show_rcu_gp_kthreads(void)
{
int cpu;
unsigned long j;
struct rcu_data *rdp;
struct rcu_node *rnp;
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);
j = jiffies - READ_ONCE(rcu_state.gp_activity);
pr_info("%s: wait state: %s(%d) ->state: %#lx delta ->gp_activity %ld\n",
rcu_state.name, gp_state_getname(rcu_state.gp_state),
rcu_state.gp_state, rcu_state.gp_kthread->state, j);
rcu_for_each_node_breadth_first(rnp) {
if (ULONG_CMP_GE(rcu_state.gp_seq, rnp->gp_seq_needed))
continue;