tests/kernel/test-trace-speed.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
  12         //asm volatile ("");
  13 struct proc_dir_entry *pentry = NULL;
  14
  15 static inline void test(unsigned long arg)
  16 {
  17         //asm volatile ("");
  18         trace_mark(test_marker, "arg1 %lu arg2 %p", arg, current);
  19 }
  20
  21 static int my_open(struct inode *inode, struct file *file)
  22 {
  23         unsigned int i;
  24         cycles_t cycles1, cycles2;
  25         unsigned long flags;
  26
  27         local_irq_save(flags);
  28         rdtsc_barrier();
  29         cycles1 = get_cycles();
  30         rdtsc_barrier();
  31         for(i=0; i<20000; i++) {
  32                 test(i);
  33         }
  34         rdtsc_barrier();
  35         cycles2 = get_cycles();
  36         rdtsc_barrier();
  37         local_irq_restore(flags);
  38         printk("cycles : %llu\n", cycles2-cycles1);
  39         return -EPERM;
  40 }
  41
  42
  43 static struct file_operations my_operations = {
  44         .open = my_open,
  45 };
  46
  47 int init_module(void)
  48 {
  49         pentry = create_proc_entry("testmark", 0444, NULL);
  50         if (pentry)
  51                 pentry->proc_fops = &my_operations;
  52
  53         return 0;
  54 }
  55
  56 void cleanup_module(void)
  57 {
  58         remove_proc_entry("testmark", NULL);
  59 }
  60
  61 MODULE_LICENSE("GPL");
  62 MODULE_AUTHOR("Mathieu Desnoyers");
  63 MODULE_DESCRIPTION("Marker Test");
  64