schulung_tools: add scheduling tests

This is a set of tests to compare the scheduling using various
policies and priorities.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

2 files changed, 46 insertions, 0 deletions

diff --git a/schulung_tools/scheduling_tests/README b/schulung_tools/scheduling_tests/README
new file mode 100644
index 0000000..cf6c601
--- /dev/null
+++ b/schulung_tools/scheduling_tests/README
@@ -0,0 +1,33 @@
+# restrict current shell to CPU0 for tests
+# (the busy.sh script restricts tests to CPU1)
+taskset -p 1 $$ > /dev/null
+
+echo 'default vs. max unnice (unnice wins)'
+sudo ./busy.sh task1_other_default & \
+	sudo nice -n -20 ./busy.sh task2_other_nice-20
+wait
+
+echo 'max unnice vs. FIFO (FIFO wins)'
+sudo chrt -f 1 ./busy.sh task1_fifo_prio1 & \
+	sudo nice -n -20 ./busy.sh task2_other_nice-20
+wait
+
+echo 'FIFO vs. FIFO (first FIFO wins)'
+sudo chrt -f 1 ./busy.sh task1_fifo_prio1 & \
+	sudo chrt -f 1 ./busy.sh task2_fifo_prio1
+wait
+
+echo 'FIFO prio 1 vs FIFO prio 2 (prio 2 wins)'
+sudo chrt -f 1 ./busy.sh task1_fifo_prio1 & \
+	sudo chrt -f 2 ./busy.sh task2_fifo_prio2
+wait
+
+echo 'RoundRobin vs RoundRobin (tie)'
+sudo chrt -r 1 ./busy.sh task1_roundrobin_prio1 & \
+	sudo chrt -r 1 ./busy.sh task2_roundrobin_prio1
+wait
+
+echo 'RoundRobin prio 1 vs RoundRobin prio 2 (prio 2 wins)'
+sudo chrt -r 1 ./busy.sh task1_roundrobin_prio1 & \
+	sudo chrt -r 2 ./busy.sh task2_roundrobin_prio2
+wait
diff --git a/schulung_tools/scheduling_tests/busy.sh b/schulung_tools/scheduling_tests/busy.sh
new file mode 100755
index 0000000..06630d0
--- /dev/null
+++ b/schulung_tools/scheduling_tests/busy.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# pin ourself to CPU1
+taskset -p 2 $$ > /dev/null
+
+echo "`date +%s`: begin $1"
+
+ct=1
+while [ $ct -lt 1000000 ]; do
+	ct=$(($ct + 1))
+done
+
+echo "`date +%s`:   end $1"