c9a9c80f |
1 | /* test-time-probe.c |
2 | * |
3 | * Test time spent in a LTTng instrumentation probe. |
4 | */ |
5 | |
6 | |
7 | #define CONFIG_LTT_FACILITY_COMPACT |
8 | #include <ltt/ltt-facility-select-compact.h> |
9 | #include "ltt-facility-compact.h" |
10 | |
11 | #include <linux/init.h> |
12 | #include <linux/module.h> |
13 | #include <linux/ltt-core.h> |
14 | |
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 | |
22 | static int ltt_test_init(void) |
23 | { |
24 | unsigned int i; |
25 | cycles_t time1, time2, time; |
26 | cycles_t tot_time = 0; |
27 | unsigned long flags; |
28 | printk(KERN_ALERT "test init\n"); |
29 | |
30 | local_irq_save(flags); |
31 | time1 = get_cycles(); |
32 | for(i=0; i<NR_LOOPS; i++) { |
33 | trace_compact_event_a(); |
34 | } |
35 | time2 = get_cycles(); |
36 | time = time2 - time1; |
37 | tot_time += time; |
38 | local_irq_restore(flags); |
39 | |
40 | printk(KERN_ALERT "test results : time per probe\n"); |
41 | printk(KERN_ALERT "number of loops : %d\n", NR_LOOPS); |
42 | printk(KERN_ALERT "total time : %llu\n", tot_time); |
43 | |
44 | printk(KERN_ALERT "test end\n"); |
45 | |
46 | return -EAGAIN; /* Fail will directly unload the module */ |
47 | } |
48 | |
49 | static void ltt_test_exit(void) |
50 | { |
51 | printk(KERN_ALERT "test exit\n"); |
52 | } |
53 | |
54 | module_init(ltt_test_init) |
55 | module_exit(ltt_test_exit) |
56 | |
57 | MODULE_LICENSE("GPL"); |
58 | MODULE_AUTHOR("Mathieu Desnoyers"); |
59 | MODULE_DESCRIPTION("Linux Trace Toolkit Test"); |
60 | |