#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/slab.h>

void get_start_time(struct timeval *tv)
{
	do_gettimeofday(tv);
}

void account_time(struct timeval *stv, struct timeval *etv, int loops)
{
	do_gettimeofday(etv);

	if (loops) {
		while (etv->tv_usec < stv->tv_usec) {
			etv->tv_sec--;
			etv->tv_usec += 1000000;
		}

		etv->tv_usec -= stv->tv_usec;
		etv->tv_sec -= stv->tv_sec;

		while (etv->tv_usec > 1000000) {
			etv->tv_usec -= 1000000;
			etv->tv_sec++;
		}

		printk("\tTotal loops: %d\n", loops);
		printk("\tTotal time: %lds%ldus\n", etv->tv_sec, etv->tv_usec);
	} else
		printk("Didn't do any loop!\n");

}

char *str;

int init_module(void)
{
	struct timeval stv, etv;
	int loops, i;

	str = kmalloc(1000, GFP_KERNEL);
	if (!str)
		return 0;
	loops = i = 5000000;

	printk("memcpy:\n");
	get_start_time(&stv);
	while (i--)
		memcpy(str + 400, str, 500);
	account_time(&stv, &etv, loops);

	i = loops;
	printk("\nmemmove:\n");
	get_start_time(&stv);
	while (i--)
		memmove(str + 400, str, 500);
	account_time(&stv, &etv, loops);

	return 0;
}

void cleanup_module(void)
{
	kfree(str);
}

MODULE_LICENSE("GPL");