From 02e6c12634c5e4e473c5df88ba537502d046b882 Mon Sep 17 00:00:00 2001
From: compudj <compudj@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Mon, 29 May 2006 12:38:22 +0000
Subject: [PATCH] add test

git-svn-id: http://ltt.polymtl.ca/svn@1863 04897980-b3bd-0310-b5e0-8ef037075253
---
 tests/kernel/Makefile       |  1 +
 tests/kernel/test-cmpxchg.c | 68 +++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 tests/kernel/test-cmpxchg.c

diff --git a/tests/kernel/Makefile b/tests/kernel/Makefile
index 8ee754f9..a2985567 100644
--- a/tests/kernel/Makefile
+++ b/tests/kernel/Makefile
@@ -6,6 +6,7 @@ ifneq ($(CONFIG_LTT),)
 	obj-m += test-instrument-size-med.o
 	obj-m += test-instrument-size-big.o
 	obj-m += test-printk-effect.o
+	obj-m += test-cmpxchg.o
 endif
 
 else
diff --git a/tests/kernel/test-cmpxchg.c b/tests/kernel/test-cmpxchg.c
new file mode 100644
index 00000000..a8166331
--- /dev/null
+++ b/tests/kernel/test-cmpxchg.c
@@ -0,0 +1,68 @@
+/* test-cmpxchg.c
+ *
+ * Test time spent in a LTTng instrumentation probe.
+ */
+
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ltt-core.h>
+#include <asm/system.h>
+
+#define NR_LOOPS 2000
+
+static volatile int test_val = 100;
+
+static void do_test(void)
+{
+	int val;
+
+	val = test_val;
+	
+	ret = cmpxchg(&test_val, val, 101);
+}
+
+static int ltt_test_init(void)
+{
+	unsigned int i;
+	cycles_t time1, time2, time;
+	cycles_t max_time = 0, min_time = 18446744073709551615ULL; /* (2^64)-1 */
+	cycles_t tot_time = 0;
+	unsigned long flags;
+	printk(KERN_ALERT "test init\n");
+	
+	local_irq_save(flags);
+	for(i=0; i<NR_LOOPS; i++) {
+		time1 = get_cycles();
+		do_test();
+		time2 = get_cycles();
+		time = time2 - time1;
+		max_time = max(max_time, time);
+		min_time = min(min_time, time);
+		tot_time += time;
+	}
+	local_irq_restore(flags);
+
+	printk(KERN_ALERT "test results : time per probe\n");
+	printk(KERN_ALERT "number of loops : %d\n", NR_LOOPS);
+	printk(KERN_ALERT "total time : %llu\n", tot_time);
+	printk(KERN_ALERT "min : %llu\n", min_time);
+	printk(KERN_ALERT "max : %llu\n", max_time);
+
+	printk(KERN_ALERT "test end\n");
+	
+	return -EAGAIN; /* Fail will directly unload the module */
+}
+
+static void ltt_test_exit(void)
+{
+	printk(KERN_ALERT "test exit\n");
+}
+
+module_init(ltt_test_init)
+module_exit(ltt_test_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Linux Trace Toolkit Test");
+
-- 
2.34.1