Kernel module to generate timers and hrtimers for the test
and shell commands.
Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
---
tests/timers.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
create mode 100644 tests/timers.c
diff --git a/tests/timers.c b/tests/timers.c
new file mode 100644
index 0000000000000..bf6ef3244bc05
--- /dev/null
+++ b/tests/timers.c
@@ -0,0 +1,58 @@
+#include <linux/timer.h>
+#include <linux/hrtimer.h>
+#include <linux/module.h>
+
+/*
+ * Testing instructions:
+ *
+ * isolate=1
+ * insmod timers.ko test_cpu=$isolate
+ * cd /sys/fs/cgroup/
+ * echo +cpuset > cgroup.subtree_control
+ * mkdir test
+ * echo isolated > test/cpuset.cpus.partition
+ * echo $isolate > test/cpuset.cpus
+ *
+ * awk "/cpu:/{y=0};/cpu: $isolate\$/{y=1};/ #[0-9]/ && y;" /proc/timer_list \
+ * | grep -q test_hrtimer_cb && echo FAIL || echo PASS
+ *
+ * Assure that there is no timers on the isolated cpu.
+ */
+
+static void test_timer_cb(struct timer_list *unused) { }
+
+static struct timer_list test_timer;
+
+static struct hrtimer test_hrtimer;
+
+static enum hrtimer_restart test_hrtimer_cb(struct hrtimer *hr_timer)
+{
+ return HRTIMER_NORESTART;
+}
+
+static int test_cpu = 1;
+module_param(test_cpu, int, 0444);
+
+static int timers_init(void)
+{
+ set_cpus_allowed_ptr(current, cpumask_of(test_cpu));
+ timer_setup(&test_timer, test_timer_cb, TIMER_PINNED);
+ test_timer.expires = KTIME_MAX;
+ add_timer(&test_timer);
+
+ hrtimer_init(&test_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ test_hrtimer.function = test_hrtimer_cb;
+ hrtimer_start(&test_hrtimer, -1, HRTIMER_MODE_REL);
+ return 0;
+}
+
+static void timers_exit(void)
+{
+ del_timer(&test_timer);
+ hrtimer_cancel(&test_hrtimer);
+}
+
+module_init(timers_init);
+module_exit(timers_exit);
+
+MODULE_LICENSE("GPL");
--
2.45.0