#include <sys/mman.h>
#include <unistd.h>
int main()
{
	int i;
	char *m = mmap(0, 1000*4096, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
	char *p = m;

	for(i = 0; i < 1000; i+=2) {
		mprotect(p, 4096, PROT_READ);
		p += 8192;
	}

	pause();

	return 0;
}