new_ctx = kmem_zalloc(sizeof(*new_ctx), KM_NOFS);
 	new_ctx->ticket = xlog_cil_ticket_alloc(log);

@@ -719,10 +720,24 @@ xlog_cil_push_work(
 	spin_unlock(&cil->xc_push_lock);
 
 	/*
-	 * pull all the log vectors off the items in the CIL, and
-	 * remove the items from the CIL. We don't need the CIL lock
-	 * here because it's only needed on the transaction commit
-	 * side which is currently locked out by the flush lock.
+	 * The CIL is stable at this point - nothing new will be added to it
+	 * because we hold the flush lock exclusively. Hence we can now issue
+	 * a cache flush to ensure all the completed metadata in the journal we
+	 * are about to overwrite is on stable storage.
+	 *
+	 * This avoids the need to have the iclogs issue REQ_PREFLUSH based
+	 * cache flushes to provide this ordering guarantee, and hence for CIL
+	 * checkpoints that require hundreds or thousands of log writes no
+	 * longer need to issue device cache flushes to provide metadata
+	 * writeback ordering.
+	 */
+	xfs_flush_bdev_async(log->l_mp->m_ddev_targp->bt_bdev, &bdev_flush);