[PATCH rcu 7/8] rcu-tasks: Make grace-period-age message human-readable

[Paul E. McKenney]

This commit adds a few words to the informative message that appears
every ten seconds in RCU Tasks and RCU Tasks Trace grace periods.
This message currently reads as follows:

rcu_tasks_wait_gp: rcu_tasks grace period 1046 is 10088 jiffies old.

After this change, it provides additional context, instead reading
as follows:

rcu_tasks_wait_gp: rcu_tasks grace period number 1046 (since boot) is 10088 jiffies old.

Reported-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 kernel/rcu/tasks.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index f5bf6fb430dab..b0b885e071fa8 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -728,7 +728,7 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
 		if (rtsi > 0 && !reported && time_after(j, lastinfo + rtsi)) {
 			lastinfo = j;
 			rtsi = rtsi * rcu_task_stall_info_mult;
-			pr_info("%s: %s grace period %lu is %lu jiffies old.\n",
+			pr_info("%s: %s grace period number %lu (since boot) is %lu jiffies old.\n",
 				__func__, rtp->kname, rtp->tasks_gp_seq, j - rtp->gp_start);
 		}
 	}
-- 
2.31.1.189.g2e36527f23