Index: lib/libc/sys/stat.2
===================================================================
RCS file: /home/dcvs/src/lib/libc/sys/stat.2,v
retrieving revision 1.5
diff -u -r1.5 stat.2
--- lib/libc/sys/stat.2	1 May 2008 23:36:43 -0000	1.5
+++ lib/libc/sys/stat.2	21 May 2008 19:31:19 -0000
@@ -123,10 +123,12 @@
 .It st_atime
 Time when file data last accessed.
 Changed by the
+.Xr execve 2 ,
 .Xr mknod 2 ,
-.Xr utimes 2
-and
+.Xr mmap 2 ,
 .Xr read 2
+and
+.Xr utimes 2
 system calls.
 .It st_mtime
 Time when file data last modified.
Index: sys/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
--- sys/kern/kern_exec.c	6 Jan 2008 16:55:51 -0000	1.63
+++ sys/kern/kern_exec.c	21 May 2008 15:26:31 -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: sys/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
--- sys/kern/vfs_subr.c	18 May 2008 05:54:25 -0000	1.114
+++ sys/kern/vfs_subr.c	21 May 2008 15:26:31 -0000
@@ -2114,3 +2114,17 @@
 	return(0);
 }
 
+void
+vn_mark_atime(struct vnode *vp, struct thread *td)
+{
+	struct vattr atimeattr;
+	struct proc *p = td->td_proc;
+	struct ucred *cred = p ? p->p_ucred : NOCRED;
+
+	if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
+		vattr_null(&atimeattr);
+		vfs_timestamp(&atimeattr.va_atime);
+		VOP_SETATTR(vp, &atimeattr, cred);
+	}
+}
+
Index: sys/sys/vnode.h
===================================================================
RCS file: /home/dcvs/src/sys/sys/vnode.h,v
retrieving revision 1.80
diff -u -r1.80 vnode.h
--- sys/sys/vnode.h	18 May 2008 21:47:05 -0000	1.80
+++ sys/sys/vnode.h	21 May 2008 15:26:31 -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: sys/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
--- sys/vm/vm_mmap.c	30 Apr 2007 07:18:57 -0000	1.39
+++ sys/vm/vm_mmap.c	21 May 2008 15:26:31 -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;
 	}