linux-kernel - [PATCH v1 6/7] [NOT-FOR-MERGE] test timers and hrtimers affinity adjustment

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Date: Thu, 16 May 2024 22:04:36 +0300
From: Costa Shulyupin <costa.shul@...hat.com>
To: longman@...hat.com,
	pauld@...hat.com,
	juri.lelli@...hat.com,
	prarit@...hat.com,
	vschneid@...hat.com,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Zefan Li <lizefan.x@...edance.com>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Petr Mladek <pmladek@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yoann Congal <yoann.congal@...le.fr>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Nhat Pham <nphamcs@...il.com>,
	Costa Shulyupin <costa.shul@...hat.com>,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: [PATCH v1 6/7] [NOT-FOR-MERGE] test timers and hrtimers affinity adjustment

Kernel module to generate timers and hrtimers for the test
and shell commands.

Signed-off-by: Costa Shulyupin <costa.shul@...hat.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