diff -urN 2.4.18pre1/fs/buffer.c lowlat/fs/buffer.c
--- 2.4.18pre1/fs/buffer.c	Fri Dec 21 20:06:42 2001
+++ lowlat/fs/buffer.c	Tue Jan  8 14:30:31 2002
@@ -221,6 +221,8 @@
 				continue;
 
 			spin_unlock(&lru_list_lock);
+			conditional_schedule();
+
 			write_locked_buffers(array, count);
 			return -EAGAIN;
 		}
@@ -228,6 +230,7 @@
 		__refile_buffer(bh);
 	}
 	spin_unlock(&lru_list_lock);
+	conditional_schedule();
 
 	if (count)
 		write_locked_buffers(array, count);
@@ -280,9 +283,11 @@
 		spin_unlock(&lru_list_lock);
 		wait_on_buffer (bh);
 		put_bh(bh);
+		conditional_schedule();
 		return -EAGAIN;
 	}
 	spin_unlock(&lru_list_lock);
+	conditional_schedule();
 	return 0;
 }
 
@@ -1031,6 +1036,7 @@
 	for (;;) {
 		struct buffer_head * bh;
 
+		conditional_schedule();
 		bh = get_hash_table(dev, block, size);
 		if (bh) {
 			touch_buffer(bh);
diff -urN 2.4.18pre1/mm/filemap.c lowlat/mm/filemap.c
--- 2.4.18pre1/mm/filemap.c	Sat Jan  5 06:17:43 2002
+++ lowlat/mm/filemap.c	Tue Jan  8 14:30:31 2002
@@ -402,11 +402,8 @@
 		}
 
 		page_cache_release(page);
-		if (current->need_resched) {
-			__set_current_state(TASK_RUNNING);
-			schedule();
-		}
 
+		conditional_schedule();
 		spin_lock(&pagecache_lock);
 		goto restart;
 	}
@@ -697,6 +690,8 @@
 	struct page **hash = page_hash(mapping, offset);
 	struct page *page; 
 
+	conditional_schedule();
+
 	spin_lock(&pagecache_lock);
 	page = __find_page_nolock(mapping, offset, *hash);
 	spin_unlock(&pagecache_lock);