Counting the CPU cycles of a function/procedure

gistfile1.c

/////////////////////////////////////////////////////////////////////////

static u_int64_t start = 0;
void access_counter(unsigned* hi, unsigned* low);

void start_counter()
{
  unsigned hi, lo;
  access_counter(&hi, &lo);
  start = ((u_int64_t)hi << 32) | lo;
}

u_int64_t get_counter()
{
  unsigned ncyc_hi, ncyc_lo;
  access_counter(&ncyc_hi, &ncyc_lo);
  return
    (((u_int64_t)ncyc_hi << 32) | ncyc_lo) - start;
}

void access_counter(unsigned *hi, unsigned *lo)
{
  asm volatile
   ("rdtsc; movl %%edx, %0; movl %%eax, %1" /* Format string */
      : "=r" (*hi), "=r" (*lo)              /* Output list */
      :                                     /* No input */
      : "%edx", "%eax");                    /* Clobber list */
}
/////////////////////////////////////////////////////////////////////////
So, the sequence is
start_counter() ;
// call your function or procedure
get_counter(); // to get the number of cycles consumed by pour code

Hi i want to implement an algorithm in cloudsim which works like this
Scenerio : Three VMs with different specs
Tasks/Cloudlets : 10 task/cloudlets
step 1: algorithm first check for available/independent tasks/cloudelts in a DAG (Directed Acyclic Graph)
step 2: algorithm does a computation on given size of cloudlets and decides which task is to be run on which VM
step 3: algorithm run the selected cloudlet on selecte vm
step 4: checks if any new independent cloudlet is available are not
if available it adds it to the list of independent task and does required computation for it
step 5: step 2 till all the cloudlets are executed

Kindly guide me how to do that