p4f# cat page_fault4.c
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <assert.h>

//#define MEMSIZE (128 * 1024 * 1024)
#define MEMSIZE (8 * 1024)

char *testcase_description = "Anonymous memory page fault";

void testcase(unsigned long long *iterations, unsigned long nr)
{
        unsigned long pgsize = getpagesize();

        int clines = atoi(getenv("CLINES"));

        while (1) {
                unsigned long i, l;

                char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
                               MAP_PRIVATE|MAP_ANON, -1, 0);
                assert(c != MAP_FAILED);

                for (i = 0; i < MEMSIZE; i += pgsize) {
                        for (l = 0; l < clines; l++)
                                c[i + l * 64] = 0;
                        (*iterations)++;
                }

                munmap(c, MEMSIZE);
        }
}