[PATCH v3 17/17] selftests/verification: Add selftests for deadline and stall monitors
From: Gabriele Monaco <gmonaco@redhat.com>
Date: 2026-06-25 12:16:21
Also in:
linux-kselftest, lkml
Subsystem:
kernel selftest framework, runtime verification (rv), the rest · Maintainers:
Shuah Khan, Steven Rostedt, Gabriele Monaco, Linus Torvalds
Add selftests to verify deadline monitors don't fail under expected conditions and the stall monitor report violations only when expected. Signed-off-by: Gabriele Monaco <gmonaco@redhat.com> --- .../verification/test.d/rv_deadline.tc | 21 ++++++++++++ .../selftests/verification/test.d/rv_stall.tc | 33 +++++++++++++++++++ 2 files changed, 54 insertions(+) create mode 100644 tools/testing/selftests/verification/test.d/rv_deadline.tc create mode 100644 tools/testing/selftests/verification/test.d/rv_stall.tc
diff --git a/tools/testing/selftests/verification/test.d/rv_deadline.tc b/tools/testing/selftests/verification/test.d/rv_deadline.tc
new file mode 100644
index 0000000000..b583096bed
--- /dev/null
+++ b/tools/testing/selftests/verification/test.d/rv_deadline.tc@@ -0,0 +1,21 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later +# description: Test deadline monitors trigger no reaction +# requires: available_reactors deadline:monitor printk:reactor stress-ng:program + +load() { # returns true if there was a reaction + local lines_before + lines_before=$(dmesg | wc -l) + stress-ng --cpu 2 --sched deadline --sched-period 100000000 --sched-deadline 100000000 --sched-runtime 20000000 -t 5 & + stress-ng --cpu 2 --sched rr --sched-prio 50 --cyclic 1 --cyclic-policy rr --cyclic-prio 50 -t 5 & + wait + dmesg | tail -n +$((lines_before + 1)) | grep -q "rv: monitor [a-z]\+ does not allow event" +} + +echo 1 > monitors/deadline/enable +echo printk > monitors/deadline/reactors + +! load || false + +echo nop > monitors/deadline/reactors +echo 0 > monitors/deadline/enable
diff --git a/tools/testing/selftests/verification/test.d/rv_stall.tc b/tools/testing/selftests/verification/test.d/rv_stall.tc
new file mode 100644
index 0000000000..8e9bcbb441
--- /dev/null
+++ b/tools/testing/selftests/verification/test.d/rv_stall.tc@@ -0,0 +1,33 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later +# description: Test stall monitor +# requires: available_reactors stall:monitor printk:reactor stress-ng:program + +THRESHOLD=/sys/module/stall/parameters/threshold_jiffies + +load() { # returns true if there was a reaction + local lines_before cpu + cpu=$(($(nproc) - 1)) + lines_before=$(dmesg | wc -l) + stress-ng --cpu 1 --taskset "$cpu" --sched rr --sched-prio 1 -t 3 & + stress-ng --cpu 5 --taskset "$cpu" -t 3 & + wait + dmesg | tail -n +$((lines_before + 1)) | grep -q "rv: monitor stall does not allow event" +} + +echo 5000 > $THRESHOLD +echo 1 > monitors/stall/enable +echo printk > monitors/stall/reactors + +! load || false + +echo 0 > monitors/stall/enable +echo 70 > $THRESHOLD +echo 1 > monitors/stall/enable + +load + +echo nop > monitors/stall/reactors +echo 0 > monitors/stall/enable + +echo 1000 > $THRESHOLD
--
2.54.0