markers-test/test-mark-speed-edit.c

   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         unsigned char *ins = __builtin_return_address(0) - 5;
  15 #if 0
  16         /* not called */
  17         printk("ip %p\n", __builtin_return_address(0));
  18         printk("prev_ins %hX %hX %hX %hX %hX\n",
  19                 ins[0], ins[1], ins[2], ins[3], ins[4]);
  20 #endif //0
  21         ins[0] = 0x90;
  22         ins[1] = 0x90;
  23         ins[2] = 0x90;
  24         ins[3] = 0x90;
  25         ins[4] = 0x90;
  26 }
  27
  28 /*
  29  * Generic marker flavor always available.
  30  * Note : the empty asm volatile with read constraint is used here instead of a
  31  * "used" attribute to fix a gcc 4.1.x bug.
  32  * Make sure the alignment of the structure in the __markers section will
  33  * not add unwanted padding between the beginning of the section and the
  34  * structure. Force alignment to the same alignment as the section start.
  35  */
  36 #define __my_trace_mark(generic, name, call_private, format, args...)   \
  37         do {                                                            \
  38                 static const char __mstrtab_##name[]                    \
  39                 __attribute__((section("__markers_strings")))           \
  40                 = #name "\0" format;                                    \
  41                 static struct marker __mark_##name                      \
  42                 __attribute__((section("__markers"), aligned(8))) =     \
  43                 { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)],   \
  44                 0, 0, marker_probe_cb,                                  \
  45                 { __mark_empty_function, NULL}, NULL };                 \
  46                 __mark_check_format(format, ## args);                   \
  47                 if (!generic) {                                         \
  48                         if (unlikely(imv_read(__mark_##name.state)))    \
  49                                 test2                   \
  50                                         (&__mark_##name, call_private,  \
  51                                         ## args);               \
  52                 } else {                                                \
  53                         if (unlikely(_imv_read(__mark_##name.state)))   \
  54                                 test2                   \
  55                                         (&__mark_##name, call_private,  \
  56                                         ## args);               \
  57                 }                                                       \
  58         } while (0)
  59
  60         //asm volatile ("");
  61 struct proc_dir_entry *pentry = NULL;
  62
  63 static inline void test(unsigned long arg, unsigned long arg2)
  64 {
  65         //asm volatile ("");
  66         //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
  67         test2(NULL, NULL, 2, current->pid, arg, arg2);
  68         //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
  69 }
  70
  71 static int my_open(struct inode *inode, struct file *file)
  72 {
  73         unsigned int i;
  74         cycles_t cycles1, cycles2;
  75         unsigned long flags;
  76
  77         local_irq_save(flags);
  78         rdtsc_barrier();
  79         cycles1 = get_cycles();
  80         rdtsc_barrier();
  81         for(i=0; i<20000; i++) {
  82                 test(i, i);
  83         }
  84         rdtsc_barrier();
  85         cycles2 = get_cycles();
  86         rdtsc_barrier();
  87         local_irq_restore(flags);
  88         printk("cycles : %llu\n", cycles2-cycles1);
  89         return -EPERM;
  90 }
  91
  92
  93 static struct file_operations my_operations = {
  94         .open = my_open,
  95 };
  96
  97 int init_module(void)
  98 {
  99         pentry = create_proc_entry("testmark", 0444, NULL);
 100         if (pentry)
 101                 pentry->proc_fops = &my_operations;
 102
 103         return 0;
 104 }
 105
 106 void cleanup_module(void)
 107 {
 108         remove_proc_entry("testmark", NULL);
 109 }
 110
 111 MODULE_LICENSE("GPL");
 112 MODULE_AUTHOR("Mathieu Desnoyers");
 113 MODULE_DESCRIPTION("Marker Test");
 114