3 * The tests in tests/ don't apply the grading patches.
5 * We need better and more example programs.
7 - Need an mmap example program as a replacement for the crappy mmap FAQ
10 * Make it clear that the students own their code, because there was some
11 confusion on that point.
15 - join-invalid doesn't compile if tid_t is not scalar type.
17 - mlfqs tests suck. They aren't even correct, e.g. the amarv
18 submission from win0405 is graded incorrectly.
22 - Don't emphasize that stuff needs to be copied from user space to
23 kernel space. Instead, emphasize validation and suggest that
24 copying is a common solution and that it will be necessary in
25 project 3 and in real OSes. Also revise the grading criteria to
28 - Move `join' implementation here, from `threads' project, to help
29 normalize the project difficulties.
31 - The semantics of the join system call should change so that it
32 only returns the exit code once.
34 - Mark read-only pages as actually read-only in the page table. Or,
35 since this was consistently rated as the easiest project by the
36 students, require them to do it.
38 - Don't provide per-process pagedir implementation but only
39 single-process implementation and require students to implement
40 the separation? This project was rated as the easiest after all.
41 Alternately we could just remove the synchronization on pid
42 selection and check that students fix it.
46 - Discuss the perils of mixing dirty bits between kernel and user virtual
51 - Update grading/vm to reflect new mmap, munmap forms.
55 - Increase maximum disk size from 8 MB to something that actually
56 requires doubly indirect nodes. There is a negative pressure here
57 from the bitmap object--perhaps we need a specialized bitmap that
58 doesn't have to be all in-memory at once.
60 Alternatively, shrink the inode size.
62 - Add mkdir and ls example user programs.
64 - Add option to disable buffer cache.
66 - Get rid of "dump" commands--they're not really useful.
72 - Finish writing tour.
74 - Add "Digging Deeper" sections that describe the nitty-gritty x86
75 details for the benefit of those interested.
77 - Add explanations of what "real" OSes do to give students some
84 . Low-level x86 stuff, like paged page tables.
86 . Specifics on how to implement sbrk, malloc.
90 . opendir/readdir/closedir
92 - Add src/testcases/vm, src/testcases/filesys and make it clear to use
97 - Release some of them.
99 - The threads, userprog, vm test source files could use
100 factorization and cleanup along the lines of fslib in the filesys
103 - The p1-4.c testcase needs significant tuning. Currently it takes
104 too long (especially when SHOW_PROGRESS is turned on) and doesn't
105 show significant improvement.