+/* test-lttng-tp.c
+ *
+ * Test lttng event write.
+ */
+
+#include <linux/jiffies.h>
+#include <linux/compiler.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/math64.h>
+#include <linux/proc_fs.h>
+#include "tp-test.h"
+#include <asm/timex.h>
+#include <asm/system.h>
+
+#define NR_LOOPS 20000
+
+DEFINE_TRACE(kernel_test);
+
+struct proc_dir_entry *pentry = NULL;
+
+int test_val;
+
+static void do_testbaseline(void)
+{
+ unsigned long flags;
+ unsigned int i;
+ cycles_t time1, time2, time;
+ u32 rem;
+
+ local_irq_save(flags);
+ preempt_disable();
+ time1 = get_cycles();
+ for (i = 0; i < NR_LOOPS; i++) {
+ asm volatile ("");
+ }
+ time2 = get_cycles();
+ local_irq_restore(flags);
+ preempt_enable();
+ time = time2 - time1;
+
+ printk(KERN_ALERT "test results: time for baseline\n");
+ printk(KERN_ALERT "number of loops: %d\n", NR_LOOPS);
+ printk(KERN_ALERT "total time: %llu\n", time);
+ time = div_u64_rem(time, NR_LOOPS, &rem);
+ printk(KERN_ALERT "-> baseline takes %llu cycles\n", time);
+ printk(KERN_ALERT "test end\n");
+}
+
+static void do_test_tp(void)
+{
+ unsigned long flags;
+ unsigned int i;
+ cycles_t time1, time2, time;
+ u32 rem;
+
+ local_irq_save(flags);
+ preempt_disable();
+ time1 = get_cycles();
+ for (i = 0; i < NR_LOOPS; i++) {
+ trace_kernel_test((void *)999, (void *)10);
+ }
+ time2 = get_cycles();
+ local_irq_restore(flags);
+ preempt_enable();
+ time = time2 - time1;
+
+ printk(KERN_ALERT "test results: time for one probe\n");
+ printk(KERN_ALERT "number of loops: %d\n", NR_LOOPS);
+ printk(KERN_ALERT "total time: %llu\n", time);
+ time = div_u64_rem(time, NR_LOOPS, &rem);
+ printk(KERN_ALERT "-> one probe takes %llu cycles\n", time);
+ printk(KERN_ALERT "test end\n");
+}
+
+static int my_open(struct inode *inode, struct file *file)
+{
+ do_testbaseline();
+ do_test_tp();
+
+ return -EPERM;
+}
+
+static const struct file_operations my_operations = {
+ .open = my_open,
+};
+
+static int ltt_test_init(void)
+{
+ printk(KERN_ALERT "test init\n");
+ pentry = create_proc_entry("testltt", 0444, NULL);
+ if (pentry)
+ pentry->proc_fops = &my_operations;
+ return 0;
+}
+
+static void ltt_test_exit(void)
+{
+ printk(KERN_ALERT "test exit\n");
+ remove_proc_entry("testltt", NULL);
+}
+
+module_init(ltt_test_init)
+module_exit(ltt_test_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("TP test");