Function default_phys_pager_populate

freebsd/vm/phys_pager.c:230–260

#define	PHYSALLOC	16

static int
default_phys_pager_populate(vm_object_t object, vm_pindex_t pidx,
    int fault_type __unused, vm_prot_t max_prot __unused, vm_pindex_t *first,
    vm_pindex_t *last)
{
	vm_page_t m;
	vm_pindex_t base, end, i;
	int ahead;

	base = rounddown(pidx, phys_pager_cluster);
	end = base + phys_pager_cluster - 1;
	if (end >= object->size)
		end = object->size - 1;
	if (*first > base)
		base = *first;
	if (end > *last)
		end = *last;
	*first = base;
	*last = end;

	for (i = base; i <= end; i++) {
		ahead = MIN(end - i, PHYSALLOC);
		m = vm_page_grab(object, i,
		    VM_ALLOC_NORMAL | VM_ALLOC_COUNT(ahead));
		if (!vm_page_all_valid(m))
			vm_page_zero_invalid(m, TRUE);
		KASSERT(m->dirty == 0,
		    ("phys_pager_populate: dirty page %p", m));
	}
	return (VM_PAGER_OK);
}

static int
phys_pager_populate(vm_object_t object, vm_pindex_t pidx, int fault_type,