Index: kern/kern_exec.c
===================================================================
RCS file: /home/dcvs/src/sys/kern/kern_exec.c,v
retrieving revision 1.63
diff -u -r1.63 kern_exec.c
--- kern/kern_exec.c	6 Jan 2008 16:55:51 -0000	1.63
+++ kern/kern_exec.c	20 May 2008 19:09:53 -0000
@@ -465,6 +465,9 @@
 	exec_setregs(imgp->entry_addr, (u_long)(uintptr_t)stack_base,
 	    imgp->ps_strings);
 
+	/* Set the access time on the vnode */
+	vn_mark_atime(imgp->vp, td);
+
 	/* Free any previous argument cache */
 	if (p->p_args && --p->p_args->ar_ref == 0)
 		FREE(p->p_args, M_PARGS);
Index: kern/vfs_subr.c
===================================================================
RCS file: /home/dcvs/src/sys/kern/vfs_subr.c,v
retrieving revision 1.114
diff -u -r1.114 vfs_subr.c
--- kern/vfs_subr.c	18 May 2008 05:54:25 -0000	1.114
+++ kern/vfs_subr.c	20 May 2008 19:35:54 -0000
@@ -2114,3 +2114,16 @@
 	return(0);
 }
 
+void
+vn_mark_atime(struct vnode *vp, struct thread *td)
+{
+	struct vattr atimeattr;
+	struct proc *p = td->td_proc;
+
+	if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
+		vattr_null(&atimeattr);
+		vfs_timestamp(&atimeattr.va_atime);
+		VOP_SETATTR(vp, &atimeattr, p->p_ucred);
+	}
+}
+
Index: sys/vnode.h
===================================================================
RCS file: /home/dcvs/src/sys/sys/vnode.h,v
retrieving revision 1.80
diff -u -r1.80 vnode.h
--- sys/vnode.h	18 May 2008 21:47:05 -0000	1.80
+++ sys/vnode.h	20 May 2008 19:31:17 -0000
@@ -520,6 +520,7 @@
 int	vn_stat (struct vnode *vp, struct stat *sb, struct ucred *cred);
 cdev_t	vn_todev (struct vnode *vp);
 void	vfs_timestamp (struct timespec *);
+void	vn_mark_atime(struct vnode *vp, struct thread *t);
 int	vn_writechk (struct vnode *vp, struct nchandle *nch);
 int	ncp_writechk(struct nchandle *nch);
 int	vop_stdopen (struct vop_open_args *ap);
Index: vm/vm_mmap.c
===================================================================
RCS file: /home/dcvs/src/sys/vm/vm_mmap.c,v
retrieving revision 1.39
diff -u -r1.39 vm_mmap.c
--- vm/vm_mmap.c	30 Apr 2007 07:18:57 -0000	1.39
+++ vm/vm_mmap.c	20 May 2008 19:10:34 -0000
@@ -983,6 +983,7 @@
 	boolean_t fitit;
 	vm_object_t object;
 	struct vnode *vp = NULL;
+	struct thread *td = curthread;
 	struct proc *p;
 	objtype_t type;
 	int rv = KERN_SUCCESS;
@@ -1064,6 +1065,9 @@
 		object = vm_pager_allocate(type, handle, objsize, prot, foff);
 		if (object == NULL)
 			return (type == OBJT_DEVICE ? EINVAL : ENOMEM);
+		/* Set the access time on the vnode */
+		vn_mark_atime(handle, td);
+
 		docow = MAP_PREFAULT_PARTIAL;
 	}