From 9cb2f48725ac2f9f54967ced3c15d41a9bf5e3ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ciro=20Santilli=20=E5=85=AD=E5=9B=9B=E4=BA=8B=E4=BB=B6=20?=
 =?UTF-8?q?=E6=B3=95=E8=BD=AE=E5=8A=9F?= <ciro.santilli@gmail.com>
Date: Thu, 16 Jan 2020 00:00:00 +0000
Subject: [PATCH] count.py

---
 README.adoc                         | 18 ++++++++++++------
 rootfs_overlay/lkmc/python/count.py | 11 +++++++++++
 2 files changed, 23 insertions(+), 6 deletions(-)
 create mode 100755 rootfs_overlay/lkmc/python/count.py

diff --git a/README.adoc b/README.adoc
index af229db..d6eb690 100644
--- a/README.adoc
+++ b/README.adoc
@@ -14431,7 +14431,15 @@ Maybe some day someone will use this setup to study the performance of interpret
 
 ==== Python
 
-Build and install the interpreter on the target:
+Examples:
+
+* link:rootfs_overlay/lkmc/python/hello.py[]: hello world
+* `time`
+** link:rootfs_overlay/lkmc/python/count.py[]: count once every second
+
+===== Build and install the interpreter
+
+Buildroot has a Python package that can be added to the guest image:
 
 ....
 ./build-buildroot --config 'BR2_PACKAGE_PYTHON3=y'
@@ -14473,7 +14481,9 @@ Non-interactive usage:
 ./run --userland "$(./getvar buildroot_target_dir)/usr/bin/python3" --userland-args rootfs_overlay/lkmc/python/hello.py
 ....
 
-LKMC 50ac89b779363774325c81157ec8b9a6bdb50a2f gem5 390a74f59934b85d91489f8a563450d8321b602da:
+===== Python gem5 user mode simulation
+
+At LKMC 50ac89b779363774325c81157ec8b9a6bdb50a2f gem5 390a74f59934b85d91489f8a563450d8321b602da:
 
 ....
 ./run \
@@ -14510,10 +14520,6 @@ fatal: syscall unused#278 (#278) unimplemented.
 
 which corresponds to the glorious `getrandom` syscall: https://github.com/torvalds/linux/blob/v4.17/include/uapi/asm-generic/unistd.h#L707
 
-Examples:
-
-* link:rootfs_overlay/lkmc/python/hello.py[]: hello world
-
 ==== Node.js
 
 Host installation shown at: https://askubuntu.com/questions/594656/how-to-install-the-latest-versions-of-nodejs-and-npm/971612#971612
diff --git a/rootfs_overlay/lkmc/python/count.py b/rootfs_overlay/lkmc/python/count.py
new file mode 100755
index 0000000..23e6931
--- /dev/null
+++ b/rootfs_overlay/lkmc/python/count.py
@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+
+# https://cirosantilli.com/linux-kernel-module-cheat#python
+
+import time
+
+i = 0
+while True:
+    print(i)
+    time.sleep(1)
+    i += 1