#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <stdlib.h>
#include <strings.h>

#define SIZE (7UL*1024*1024*1024)
#define ITER 3

int main(void)
{
	int to_alloc, i;
	char *mem, *p;
	char n;
	struct timeval tp;
	double sec, usec, start, end;

	mem = (char *) malloc(SIZE);

	if (!mem)
		return 1;

	bzero(mem, SIZE);
	asm volatile("" : : : "memory");

	printf("Run ksm in host and after full scan press enter.");
	getchar();

	gettimeofday(&tp, NULL);
	sec = (double) tp.tv_sec;
	usec = (double) tp.tv_usec/1E6;
	start = sec + usec;

	for (i = 0; i < ITER; i++) {
		p = mem;
		while (p++ < mem + SIZE)	
			n += *p;
	}

	gettimeofday(&tp, NULL);
	sec = (double) tp.tv_sec;
	usec = (double) tp.tv_usec/1E6;
	end = sec + usec;

	printf("Time: %f\n", end - start);

	free(mem);

	return 0;
}