8dd5f9aa |
1 | /* test-mark.c |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
9 | #include <linux/marker.h> |
10 | #include <asm/ptrace.h> |
11 | static void noinline test2(const struct marker *mdata, |
12 | void *call_private, ...) |
13 | { |
14 | /* not called */ |
15 | printk("blah\n"); |
16 | } |
17 | |
18 | /* |
19 | * Generic marker flavor always available. |
20 | * Note : the empty asm volatile with read constraint is used here instead of a |
21 | * "used" attribute to fix a gcc 4.1.x bug. |
22 | * Make sure the alignment of the structure in the __markers section will |
23 | * not add unwanted padding between the beginning of the section and the |
24 | * structure. Force alignment to the same alignment as the section start. |
25 | */ |
26 | #define __my_trace_mark(generic, name, call_private, format, args...) \ |
27 | do { \ |
28 | static const char __mstrtab_##name[] \ |
29 | __attribute__((section("__markers_strings"))) \ |
30 | = #name "\0" format; \ |
31 | static struct marker __mark_##name \ |
32 | __attribute__((section("__markers"), aligned(8))) = \ |
33 | { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \ |
34 | 0, 0, marker_probe_cb, \ |
35 | { __mark_empty_function, NULL}, NULL }; \ |
36 | __mark_check_format(format, ## args); \ |
37 | if (!generic) { \ |
38 | if (unlikely(imv_read(__mark_##name.state))) \ |
39 | test2 \ |
40 | (&__mark_##name, call_private, \ |
41 | ## args); \ |
42 | } else { \ |
43 | if (unlikely(_imv_read(__mark_##name.state))) \ |
44 | test2 \ |
45 | (&__mark_##name, call_private, \ |
46 | ## args); \ |
47 | } \ |
48 | } while (0) |
49 | |
50 | //asm volatile (""); |
51 | struct proc_dir_entry *pentry = NULL; |
52 | |
53 | static inline void test(unsigned long arg, unsigned long arg2) |
54 | { |
55 | asm volatile (""); |
56 | //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
57 | //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
58 | } |
59 | |
60 | static int my_open(struct inode *inode, struct file *file) |
61 | { |
62 | unsigned int i; |
63 | cycles_t cycles1, cycles2; |
64 | unsigned long flags; |
65 | |
66 | local_irq_save(flags); |
67 | rdtsc_barrier(); |
68 | cycles1 = get_cycles(); |
69 | rdtsc_barrier(); |
70 | for(i=0; i<20000; i++) { |
71 | test(i, i); |
72 | } |
73 | rdtsc_barrier(); |
74 | cycles2 = get_cycles(); |
75 | rdtsc_barrier(); |
76 | local_irq_restore(flags); |
77 | printk("cycles : %llu\n", cycles2-cycles1); |
78 | return -EPERM; |
79 | } |
80 | |
81 | |
82 | static struct file_operations my_operations = { |
83 | .open = my_open, |
84 | }; |
85 | |
86 | int init_module(void) |
87 | { |
88 | pentry = create_proc_entry("testmark", 0444, NULL); |
89 | if (pentry) |
90 | pentry->proc_fops = &my_operations; |
91 | |
92 | return 0; |
93 | } |
94 | |
95 | void cleanup_module(void) |
96 | { |
97 | remove_proc_entry("testmark", NULL); |
98 | } |
99 | |
100 | MODULE_LICENSE("GPL"); |
101 | MODULE_AUTHOR("Mathieu Desnoyers"); |
102 | MODULE_DESCRIPTION("Marker Test"); |
103 | |