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1 | /* test-time-probe.c |
2 | * |
3 | * Test time spent in a LTTng instrumentation probe. |
4 | */ |
5 | |
6 | |
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7 | #include <linux/init.h> |
8 | #include <linux/module.h> |
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9 | #include <linux/ltt-tracer.h> |
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10 | #include <linux/timex.h> |
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11 | #include <linux/marker.h> |
12 | #include <linux/proc_fs.h> |
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13 | |
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14 | struct proc_dir_entry *pentry_test = NULL; |
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15 | |
16 | /* Event logged : 4 bytes. Let's use 1MB of |
17 | * buffers. 1MB / 4bytes = 262144 (plus heartbeats). So, if we write 20000 |
18 | * event, we should not lose events. Check event lost count after tests. */ |
19 | |
20 | #define NR_LOOPS 20000 |
21 | |
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22 | static int my_open(struct inode *inode, struct file *file) |
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23 | { |
24 | unsigned int i; |
25 | cycles_t time1, time2, time; |
26 | cycles_t tot_time = 0; |
27 | unsigned long flags; |
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28 | |
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29 | printk(KERN_ALERT "test begin\n"); |
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30 | local_irq_save(flags); |
31 | time1 = get_cycles(); |
32 | for(i=0; i<NR_LOOPS; i++) { |
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33 | _MARK(_MF_DEFAULT | ltt_flag_mask(LTT_FLAG_COMPACT), |
34 | compact_event_a, MARK_NOARGS); |
35 | _MARK(_MF_DEFAULT | ltt_flag_mask(LTT_FLAG_COMPACT), |
36 | compact_event_b, "%4b", 0xFFFF); |
37 | _MARK(_MF_DEFAULT | ltt_flag_mask(LTT_FLAG_COMPACT), |
38 | compact_event_c, "%8b", 0xFFFFFFFFULL); |
39 | _MARK(_MF_DEFAULT | ltt_flag_mask(LTT_FLAG_COMPACT) |
40 | | ltt_flag_mask(LTT_FLAG_COMPACT_DATA), |
41 | compact_event_d, MARK_NOARGS, 0xFFFF); |
42 | _MARK(_MF_DEFAULT | ltt_flag_mask(LTT_FLAG_COMPACT) |
43 | | ltt_flag_mask(LTT_FLAG_COMPACT_DATA), |
44 | compact_event_e, "%8b", 0xFFFF, 0xFFFFFFFFULL); |
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45 | } |
46 | time2 = get_cycles(); |
47 | time = time2 - time1; |
48 | tot_time += time; |
49 | local_irq_restore(flags); |
50 | |
51 | printk(KERN_ALERT "test results : time per probe\n"); |
52 | printk(KERN_ALERT "number of loops : %d\n", NR_LOOPS); |
53 | printk(KERN_ALERT "total time : %llu\n", tot_time); |
54 | |
55 | printk(KERN_ALERT "test end\n"); |
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56 | return -EPERM; |
57 | } |
58 | |
59 | static struct file_operations mark_ops = { |
60 | .open = my_open, |
61 | }; |
62 | |
63 | static int ltt_test_init(void) |
64 | { |
65 | printk(KERN_ALERT "test init\n"); |
66 | pentry_test = create_proc_entry("test-compact", 0444, NULL); |
67 | if (pentry_test) |
68 | pentry_test->proc_fops = &mark_ops; |
69 | else |
70 | return -EPERM; |
71 | return 0; |
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72 | } |
73 | |
74 | static void ltt_test_exit(void) |
75 | { |
76 | printk(KERN_ALERT "test exit\n"); |
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77 | remove_proc_entry("test-compact", NULL); |
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78 | } |
79 | |
80 | module_init(ltt_test_init) |
81 | module_exit(ltt_test_exit) |
82 | |
83 | MODULE_LICENSE("GPL"); |
84 | MODULE_AUTHOR("Mathieu Desnoyers"); |
85 | MODULE_DESCRIPTION("Linux Trace Toolkit Test"); |
86 | |