a4cc6451 |
1 | /* test-irqloop |
2 | * |
3 | * Test time spent for irq disabling |
4 | */ |
5 | |
6 | |
a4cc6451 |
7 | #include <linux/jiffies.h> |
8 | #include <linux/compiler.h> |
9 | #include <linux/init.h> |
10 | #include <linux/module.h> |
11 | |
12 | #define NR_LOOPS 20000 |
13 | |
14 | static int ltt_test_init(void) |
15 | { |
16 | unsigned int i; |
17 | cycles_t time1, time2, time; |
18 | cycles_t max_time = 0, min_time = 18446744073709551615ULL; /* (2^64)-1 */ |
19 | cycles_t tot_time = 0; |
20 | unsigned long flags; |
21 | printk(KERN_ALERT "test init\n"); |
22 | |
23 | time1 = get_cycles(); |
24 | for(i=0; i<NR_LOOPS; i++) { |
25 | local_irq_save(flags); |
26 | local_irq_restore(flags); |
27 | } |
28 | time2 = get_cycles(); |
29 | time = time2 - time1; |
30 | tot_time += time; |
31 | |
32 | printk(KERN_ALERT "test results : time for irq save/restore\n"); |
33 | printk(KERN_ALERT "number of loops : %d\n", NR_LOOPS); |
34 | printk(KERN_ALERT "total time : %llu\n", tot_time); |
35 | //printk(KERN_ALERT "min : %llu\n", min_time); |
36 | //printk(KERN_ALERT "max : %llu\n", max_time); |
37 | |
38 | printk(KERN_ALERT "test end\n"); |
39 | |
40 | return -EAGAIN; /* Fail will directly unload the module */ |
41 | } |
42 | |
43 | static void ltt_test_exit(void) |
44 | { |
45 | printk(KERN_ALERT "test exit\n"); |
46 | } |
47 | |
48 | module_init(ltt_test_init) |
49 | module_exit(ltt_test_exit) |
50 | |
51 | MODULE_LICENSE("GPL"); |
52 | MODULE_AUTHOR("Mathieu Desnoyers"); |
53 | MODULE_DESCRIPTION("Linux Trace Toolkit Test"); |
54 | |