tests/markers/test-micro-loop-marker.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 #include <linux/string.h>
  13
  14 #define NR_LOOPS 100000
  15
  16
  17 #define COPYLEN 4096
  18 char test[COPYLEN];
  19 char src[COPYLEN] = "aaaaaaaaaaaa";
  20
  21 struct proc_dir_entry *pentry = NULL;
  22
  23 static int my_open(struct inode *inode, struct file *file)
  24 {
  25         unsigned int i;
  26         unsigned long flags;
  27         cycles_t time1, time2;
  28
  29         local_irq_save(flags);
  30         time1 = get_cycles();
  31         for(i=0; i<NR_LOOPS; i++) {
  32                 MARK(subsys_mark1, "%d %p", 1, NULL);
  33                 //memcpy(test, src, COPYLEN);
  34         }
  35         time2 = get_cycles();
  36         local_irq_restore(flags);
  37         printk("time delta (cycles): %llu\n", time2-time1);
  38
  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