thp_zero_page.c

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

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

        int i, k, j = 0;
        printf("starting after 120 seconds\n");
        sleep(120);
        for (i = 0; i < 195; i++) {
                /* read 512 4kB pages = 2MB */
                for (k = 0; k < 512; k++) {
                        *p = memory_area1[j];
                        j += 1024;
                }
                /* write 512 4kB pages = 2MB */
                for (k = 0; k < 512; k++) {
                        memory_area1[j] = 1;
                        j += 1024;
                }
        }
        printf("first 800MB allocated\n");
        printf("read-write is completed\n");
        getchar();
        return 0;
}