From c06476bfc821659a4731d49e808f45e8c509c5e1 Mon Sep 17 00:00:00 2001
From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Sat, 12 May 2018 18:27:05 +0100
Subject: [PATCH] /proc/interrupts: observe ttyS0 interrupts go up in text mode

---
 README.adoc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.adoc b/README.adoc
index c537559..f2716dc 100644
--- a/README.adoc
+++ b/README.adoc
@@ -2761,6 +2761,8 @@ This confirms that:
 
 The module also shows which handlers are registered for each IRQ, as we have observed at <<irq-ko>>
 
+When in text mode, we can also observe interrupt line 4 with handler `ttyS0` increase continuously as IO goes through the UART.
+
 === Linux kernel tracing
 
 Good overviews: