Update.

[pintos-anon] / TODO

diff --git a/TODO b/TODO
index 15902a2cd3db19fd7e77209b9d82127190a96759..e037e2bf2decea596776dc218aecac4f071dee11 100644 (file)
--- a/TODO
+++ b/TODO
@@ -1,12 +1,26 @@
 -*- text -*-
 
-* Userprog project:
+* The tests in tests/ don't apply the grading patches.
+
+* We need better and more example programs.
+
+  - Need an mmap example program as a replacement for the crappy mmap FAQ
+    question.
+
+  - How about `diff' and `cmp' programs?
 
-  - Move `join' implementation here, from `threads' project, to help
-    normalize the project difficulties.
+* Threads:
+
+  - mlfqs tests suck.  They aren't even correct, e.g. the amarv
+    submission from win0405 is graded incorrectly.
+
+* Userprog project:
 
-  - The semantics of the join system call should change so that it
-    only returns the exit code once.
+  - Don't emphasize that stuff needs to be copied from user space to
+    kernel space.  Instead, emphasize validation and suggest that
+    copying is a common solution and that it will be necessary in
+    project 3 and in real OSes.  Also revise the grading criteria to
+    match.
 
   - Mark read-only pages as actually read-only in the page table.  Or,
     since this was consistently rated as the easiest project by the
@@ -18,6 +32,39 @@
     Alternately we could just remove the synchronization on pid
     selection and check that students fix it.
 
+* VM project:
+
+  - Discuss the perils of mixing dirty bits between kernel and user virtual
+    memory.
+
+  - Sample solution.
+
+  - Update grading/vm to reflect new mmap, munmap forms.
+
+* Filesys project:
+
+  - Increase maximum disk size from 8 MB to something that actually
+    requires doubly indirect nodes.  There is a negative pressure here
+    from the bitmap object--perhaps we need a specialized bitmap that
+    doesn't have to be all in-memory at once.
+
+    Alternatively, shrink the inode size.
+
+  - Add mkdir and ls example user programs.
+
+  - Add option to disable buffer cache.
+
+  - Get rid of "dump" commands--they're not really useful.
+
+  - Sample solution.
+
+  - Need a better way to measure performance improvement of buffer
+    cache.  Some students reported that their system was slower with
+    cache--likely, Bochs doesn't simulate a disk with a realistic
+    speed.
+
+  - Clarify effect of remove(cwd).
+
 * Documentation:
 
   - Finish writing tour.
@@ -34,10 +81,13 @@
 
     . Low-level x86 stuff, like paged page tables.
 
+    . Specifics on how to implement sbrk, malloc.
+
     . Other good ideas.
 
-  - mmap/munmap should use segment IDs like Nachos.  Too hard
-    otherwise.
+    . opendir/readdir/closedir
+
+    . everything needed for getcwd()
 
   - Add src/testcases/vm, src/testcases/filesys and make it clear to use
     them?
@@ -54,3 +104,21 @@
     too long (especially when SHOW_PROGRESS is turned on) and doesn't
     show significant improvement.
 
+* Code:
+
+  - Make threads test use a program and arguments like the other
+    projects.
+
+  - Revise command-line arguments for sensibility instead of for
+    Nachos compatibility.
+
+  - Get rid of all compile-time flags, e.g. MLFQS should be a runtime
+    command-line option.
+
+  - Need an optimization barrier and an explanation of it in the
+    documentation.
+
+  - Need to check the wait system call more thoroughly.
+
+  - Library is not precisely standard, e.g. ptrdiff_t should not be
+    defined by stdlib.h.