jrcu: separate barrier and sync stats

Index: b/kernel/jrcu.c
===================================================================
@@ -122,6 +122,7 @@ static struct rcu_stats {
 	unsigned npasses;	/* #passes made */
 	unsigned nbatches;	/* #end-of-batches (eobs) seen */
 	atomic_t nbarriers;	/* #rcu barriers processed */
+	atomic_t nsyncs;	/* #rcu syncs processed */
 	u64 ninvoked;		/* #invoked (ie, finished) callbacks */
 	atomic_t nleft;		/* #callbacks left (ie, not yet invoked) */
 	unsigned nforced;	/* #forced eobs (should be zero) */

@@ -215,7 +216,7 @@ void synchronize_sched(void)
 	init_completion(&rcu.completion);
 	call_rcu(&rcu.head, wakeme_after_rcu);
 	wait_for_completion(&rcu.completion);
-	atomic_inc(&rcu_stats.nbarriers);
+	atomic_inc(&rcu_stats.nsyncs);
 
 }
 EXPORT_SYMBOL_GPL(synchronize_sched);

@@ -224,6 +225,7 @@ void rcu_barrier(void)
 {
 	synchronize_sched();
 	synchronize_sched();
+	atomic_inc(&rcu_stats.nbarriers);
 }
 EXPORT_SYMBOL_GPL(rcu_barrier);
 

@@ -604,6 +606,8 @@ static int rcu_debugfs_show(struct seq_f
 	seq_printf(m, "\n");
 	seq_printf(m, "%14u: #barriers\n",
 		atomic_read(&rcu_stats.nbarriers));
+	seq_printf(m, "%14u: #syncs\n",
+		atomic_read(&rcu_stats.nsyncs));
 	seq_printf(m, "%14llu: #callbacks invoked\n",
 		rcu_stats.ninvoked);
 	seq_printf(m, "%14u: #callbacks left to invoke\n",