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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> |
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11 | #include <asm/system.h> |
12 | |
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13 | static void noinline test2(const struct marker *mdata, |
14 | void *call_private, ...) |
15 | { |
16 | /* not called */ |
17 | printk("blah\n"); |
18 | } |
19 | |
20 | /* |
21 | * Generic marker flavor always available. |
22 | * Note : the empty asm volatile with read constraint is used here instead of a |
23 | * "used" attribute to fix a gcc 4.1.x bug. |
24 | * Make sure the alignment of the structure in the __markers section will |
25 | * not add unwanted padding between the beginning of the section and the |
26 | * structure. Force alignment to the same alignment as the section start. |
27 | */ |
28 | #define __my_trace_mark(generic, name, call_private, format, args...) \ |
29 | do { \ |
30 | static const char __mstrtab_##name[] \ |
31 | __attribute__((section("__markers_strings"))) \ |
32 | = #name "\0" format; \ |
33 | static struct marker __mark_##name \ |
34 | __attribute__((section("__markers"), aligned(8))) = \ |
35 | { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \ |
36 | 0, 0, marker_probe_cb, \ |
37 | { __mark_empty_function, NULL}, NULL }; \ |
38 | __mark_check_format(format, ## args); \ |
39 | if (!generic) { \ |
40 | if (unlikely(imv_read(__mark_##name.state))) \ |
41 | test2 \ |
42 | (&__mark_##name, call_private, \ |
43 | ## args); \ |
44 | } else { \ |
45 | if (unlikely(_imv_read(__mark_##name.state))) \ |
46 | test2 \ |
47 | (&__mark_##name, call_private, \ |
48 | ## args); \ |
49 | } \ |
50 | } while (0) |
51 | |
52 | //asm volatile (""); |
53 | struct proc_dir_entry *pentry = NULL; |
54 | |
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55 | int temp __cacheline_aligned = 10; |
56 | |
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57 | static inline void test(unsigned long arg, unsigned long arg2) |
58 | { |
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59 | #ifdef CACHEFLUSH |
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60 | wbinvd(); |
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61 | #endif |
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62 | temp = (temp + 60) << 10; |
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63 | //asm volatile (""); |
64 | __my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
65 | //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2); |
66 | } |
67 | |
68 | static int my_open(struct inode *inode, struct file *file) |
69 | { |
70 | unsigned int i; |
71 | cycles_t cycles1, cycles2; |
72 | unsigned long flags; |
73 | |
74 | local_irq_save(flags); |
75 | rdtsc_barrier(); |
76 | cycles1 = get_cycles(); |
77 | rdtsc_barrier(); |
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78 | for(i=0; i<200; i++) { |
79 | test(i, i); |
80 | test(i, i); |
81 | test(i, i); |
82 | test(i, i); |
83 | test(i, i); |
84 | test(i, i); |
85 | test(i, i); |
86 | test(i, i); |
87 | test(i, i); |
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88 | test(i, i); |
89 | } |
90 | rdtsc_barrier(); |
91 | cycles2 = get_cycles(); |
92 | rdtsc_barrier(); |
93 | local_irq_restore(flags); |
94 | printk("cycles : %llu\n", cycles2-cycles1); |
95 | return -EPERM; |
96 | } |
97 | |
98 | |
99 | static struct file_operations my_operations = { |
100 | .open = my_open, |
101 | }; |
102 | |
103 | int init_module(void) |
104 | { |
105 | pentry = create_proc_entry("testmark", 0444, NULL); |
106 | if (pentry) |
107 | pentry->proc_fops = &my_operations; |
108 | |
109 | return 0; |
110 | } |
111 | |
112 | void cleanup_module(void) |
113 | { |
114 | remove_proc_entry("testmark", NULL); |
115 | } |
116 | |
117 | MODULE_LICENSE("GPL"); |
118 | MODULE_AUTHOR("Mathieu Desnoyers"); |
119 | MODULE_DESCRIPTION("Marker Test"); |
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120 | MODULE_VERSION("1.0"); |