3 * Test time spent for irq disabling
7 #include <linux/config.h>
8 #include <linux/jiffies.h>
9 #include <linux/compiler.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
13 #define NR_LOOPS 20000
15 static int ltt_test_init(void)
18 cycles_t time1
, time2
, time
;
19 cycles_t max_time
= 0, min_time
= 18446744073709551615ULL; /* (2^64)-1 */
20 cycles_t tot_time
= 0;
22 printk(KERN_ALERT
"test init\n");
25 for(i
=0; i
<NR_LOOPS
; i
++) {
26 local_irq_save(flags
);
27 local_irq_restore(flags
);
33 printk(KERN_ALERT
"test results : time for irq save/restore\n");
34 printk(KERN_ALERT
"number of loops : %d\n", NR_LOOPS
);
35 printk(KERN_ALERT
"total time : %llu\n", tot_time
);
36 //printk(KERN_ALERT "min : %llu\n", min_time);
37 //printk(KERN_ALERT "max : %llu\n", max_time);
39 printk(KERN_ALERT
"test end\n");
41 return -EAGAIN
; /* Fail will directly unload the module */
44 static void ltt_test_exit(void)
46 printk(KERN_ALERT
"test exit\n");
49 module_init(ltt_test_init
)
50 module_exit(ltt_test_exit
)
52 MODULE_LICENSE("GPL");
53 MODULE_AUTHOR("Mathieu Desnoyers");
54 MODULE_DESCRIPTION("Linux Trace Toolkit Test");
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