trunk/tests/markers/test-micro-loop-probe.c

   1 /* test-micro-loop-marker.c
   2  *
   3  * Execute a marker in a loop
   4  */
   5
   6 #include <linux/marker.h>
   7 #include <linux/module.h>
   8 #include <linux/proc_fs.h>
   9 #include <linux/sched.h>
  10 #include <asm/ptrace.h>
  11 #include <linux/timex.h>
  12
  13 #define NR_LOOPS 100000
  14
  15 struct proc_dir_entry *pentry = NULL;
  16
  17 static int my_open(struct inode *inode, struct file *file)
  18 {
  19         volatile unsigned int i;
  20         unsigned long flags;
  21         cycles_t time1, time2;
  22
  23         local_irq_save(flags);
  24         time1 = get_cycles();
  25         for(i=0; i<NR_LOOPS; i++) {
  26                 MARK(subsys_mark1, "%d %p", 1, NULL);
  27         }
  28         time2 = get_cycles();
  29         local_irq_restore(flags);
  30         printk("time delta (cycles): %llu\n", time2-time1);
  31
  32         return -EPERM;
  33 }
  34
  35
  36 static struct file_operations my_operations = {
  37         .open = my_open,
  38 };
  39
  40 int init_module(void)
  41 {
  42         pentry = create_proc_entry("testmark", 0444, NULL);
  43         if (pentry)
  44                 pentry->proc_fops = &my_operations;
  45
  46         return 0;
  47 }
  48
  49 void cleanup_module(void)
  50 {
  51         remove_proc_entry("testmark", NULL);
  52 }
  53
  54 MODULE_LICENSE("GPL");
  55 MODULE_AUTHOR("Mathieu Desnoyers");
  56 MODULE_DESCRIPTION("Marker Test");
  57