#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>

int main(void) {
  size_t pagesize = getpagesize();

  printf("System page size: %zu bytes\n", pagesize);

  for (size_t i = 0; i < 1000; i++) {
    char *region = mmap(
      NULL,
      pagesize * (i + 1),
      PROT_READ|PROT_WRITE,
      MAP_ANONYMOUS | MAP_PRIVATE,      // to a private block of hardware memory
      -1,
      0
    );
    if (region == MAP_FAILED) {
      perror("Could not mmap");
      return 1;
    }
    // Trigger page fault
    for (size_t j = 0; j < pagesize * (i + 1); j++) {
      region[j] = 'a';
    }

    int unmap_result = munmap(region, pagesize * (i + 1));
    if (unmap_result == -1) {
      perror("Could not munmap");
      return 1;
    }
    sleep(1);
  }

  return 0;
}