thp_test half read, half write pages

#include <stdio.h>
#include <stdlib.h>

int main() {
        int *memory_area1 = malloc(819200000);
        int *p;

        int i, j = 0;
        for (i = 0; i < 200000; i++) {
                /* write per 4kB, 1024*4byte */
                memory_area1[j] = 1;
                j += 1024;
        }

        printf("First 800MB allocated\n");
        sleep(10);
        printf("After 600 seconds start to read first area\n");
        sleep(600);
        printf("Ten seconds ..\n");
        sleep(10);
        printf("Starting..\n");
        /* read or write every 4kb page to make swapped in */

        for (i = 0; i < 100000; i++) {
                /* 1024*4bytes = 4kB read */
                *p = *memory_area1;
                memory_area1 += 1024;
                /* 1024*4bytes = 4kB write */
                *memory_area1 = 1;
                memory_area1 += 1024;
        }
        printf("Read is completed\n");
        getchar();
        return 0;
}