3 * Test time spent in a LTTng instrumentation probe.
7 #include <linux/jiffies.h>
8 #include <linux/compiler.h>
9 #include <linux/init.h>
10 #include <linux/module.h>
12 #define NR_LOOPS 20000
14 volatile int test_val
= 100;
17 static inline void do_test(void)
23 ret
= cmpxchg(&test_val
, val
, val
+1);
26 //void (*fct)(void) = do_test;
28 static int ltt_test_init(void)
31 cycles_t time1
, time2
, time
;
32 cycles_t max_time
= 0, min_time
= 18446744073709551615ULL; /* (2^64)-1 */
33 cycles_t tot_time
= 0;
35 printk(KERN_ALERT
"test init\n");
37 local_irq_save(flags
);
39 for(i
=0; i
<NR_LOOPS
; i
++) {
40 //for(int j=0; j<10; j++) {
43 //max_time = max(max_time, time);
44 //min_time = min(min_time, time);
45 //printk("val : %d\n", test_val);
48 local_irq_restore(flags
);
52 printk(KERN_ALERT
"test results : time for cmpxchg\n");
53 printk(KERN_ALERT
"number of loops : %d\n", NR_LOOPS
);
54 printk(KERN_ALERT
"total time : %llu\n", tot_time
);
55 //printk(KERN_ALERT "min : %llu\n", min_time);
56 //printk(KERN_ALERT "max : %llu\n", max_time);
58 printk(KERN_ALERT
"test end\n");
60 return -EAGAIN
; /* Fail will directly unload the module */
63 static void ltt_test_exit(void)
65 printk(KERN_ALERT
"test exit\n");
68 module_init(ltt_test_init
)
69 module_exit(ltt_test_exit
)
71 MODULE_LICENSE("GPL");
72 MODULE_AUTHOR("Mathieu Desnoyers");
73 MODULE_DESCRIPTION("Linux Trace Toolkit Test");
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