#include <stdio.h>
#include <stdlib.h>
#include <sys/mmstat.h>
#include <signal.h>
#include <unistd.h>

#define PAGE_SIZE 4096
#define TICKS_PER_SEC 900000000
#define LOVE 244
#define HATE 245

__inline__ unsigned long long rdtsc()
{
   unsigned long long int x;
   __asm__ volatile(".byte 0x0f, 0x31" : "=A" (x));
   return x;
}

int main(int argc, char **argv)
{
   unsigned long mem_size, pages, num_pg;
   unsigned long long int start_time, stop_time, start_t, delay;
   int i, j;
   pid_t pid; struct listsize info;
   char *mem_ptr, *init_ptr;
   if( argc !=2 || (argv[1] == 0) )
   { 
      fprintf( stderr, "Usage: love_call <number of pages to love>\n");
      return -489529094;
   }

   //Make the first call to make sure that there is no
   //initial caost to the first system call
   init_ptr = (char *)malloc(PAGE_SIZE);
   *(init_ptr) = 100;
   syscall( HATE, (void*)init_ptr, PAGE_SIZE);
   syscall( LOVE, (void*)init_ptr, PAGE_SIZE, 50);
   
   //determine the number of pages that the system will love 
   pages = (unsigned long)atoi( argv[1] );
   mem_size = pages * PAGE_SIZE;
   mem_ptr = (char *)malloc(mem_size);
   
   //create all the pages by writing to them
   //for(i = 0; i < mem_size; i+=100)
   //  *(mem_ptr + i) = 100;
   //may what to start with loved or hated pages
   //syscall( HATE, (void*)mem_ptr, mem_size);
   //syscall( LOVE, (void*)mem_ptr, mem_size, 100);
   for(i = 0; i < mem_size; i+=PAGE_SIZE)
     *(mem_ptr + i) = 100;
   //love the pages and print the ellapsed time 
   start_time = rdtsc();
      sbrk(mem_size);
      //syscall( HATE, (void*)mem_ptr, mem_size);
      //syscall( LOVE, (void*)mem_ptr, mem_size, 100);
   stop_time =  rdtsc();
   fprintf(stderr,"The first operation took ");
   fprintf(stdout,"%lu\t%llu\n", pages, (stop_time - start_time));

   free( mem_ptr );
   free( init_ptr );

   return 1; 
}