--- sched_fair-old.c	2007-10-03 12:45:17.010306000 +0200
+++ sched_fair.c	2007-10-03 12:44:46.899851000 +0200
@@ -803,7 +803,35 @@ static void yield_task_fair(struct rq *r
 		update_curr(cfs_rq);
 
 		return;
+	} else if (sysctl_sched_compat_yield == 2) {
+		unsigned long ideal_runtime, delta_exec,
+			      delta_exec_weighted;
+
+		__update_rq_clock(rq);
+		/*
+		 * Update run-time statistics of the 'current'.
+		 */
+		update_curr(cfs_rq);
+
+		/*
+		 * Emulate the effect of us being preempted
+		 * by scheduler_tick().
+		 */
+		ideal_runtime = sched_slice(cfs_rq, curr);
+		delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
+
+		if (ideal_runtime > delta_exec) {
+			delta_exec_weighted = ideal_runtime - delta_exec;
+
+			if (unlikely(curr->load.weight != NICE_0_LOAD)) {
+				delta_exec_weighted = calc_delta_fair(delta_exec_weighted,
+									&se->load);
+			}
+			se->vruntime += delta_exec_weighted;
+		}
+		return;
 	}
+
 	/*
 	 * Find the rightmost entry in the rbtree:
 	 */