Add explanatory comments to vm tests.

diff --git a/src/tests/userprog/no-vm/multi-oom.c b/src/tests/userprog/no-vm/multi-oom.c
index 042cb2c5338d313c804a6ce94abeeecadf9ad09d..d4d50a64a7370ac9bd4ed0e0c3fbf3a931049e16 100644 (file)
--- a/src/tests/userprog/no-vm/multi-oom.c
+++ b/src/tests/userprog/no-vm/multi-oom.c
@@ -1,3 +1,8 @@
+/* Recursively executes itself until the child fails to execute.
+   We expect that at least 15 copies can run.
+   We also require that, if a process doesn't actually get to
+   start, exec() must return -1, not a valid PID. */
+
 #include <debug.h>
 #include <stdio.h>
 #include <stdlib.h>