In the slides and videos section below, I will post slides and pre-recorded discussion section videos before 6PM on the day before the live discussion section. In a discussion section video, I will primarily present information regrading up-coming programming assignments. I will also post live discussion section videos there.

A live discussion section is conducted by a TA. Since we have two TAs this summer session, most likely, they will alternate in leading the discussion section.

• Fri 10:00am - 11:10am on Zoom (Zoom meeting ID given here)

During a live discussion section, the TA will answer questions about the pre-recorded video and answer your questions about programming assignments. If you have a particular topic that you would like the TA to discuss in class (including stuff like something covered in lectures that you would like the TA to explain further), you should send e-mail to the TA before 6PM on Thursday. The TA will try his/her best to cover such requests.

To download all the PDF files below in one command (so you can study for exams), do the following inside a terminal in Ubuntu 16.04:

    wget -r -l 1 --user=USERID --password=PASSWORD http://merlot.usc.edu/cs402-m21/summer-discussions.html

where USERID and PASSWORD are the user ID and password used to access protected content from our class web site. But please note that the lecture slides can change at any time without notice. Therefore, it's a good idea to re-run the above command often to synchroniza your copy with the server!

(Please note that access to discussion slides and videos are restricted.)

Week 1	Discussion 1 videos and slides: (for 5/21) video (part 1 of 1) - 56 minutes (PDF) - gdb, warmup #1 (part 1) live discussion section (5/21) - 36 minutes
Week 2	Discussion 2 videos and slides: (for 5/28) video (part 1 of 1) - 49 minutes (PDF) - warmup #1 (part 2) live discussion section (5/28) - 11 minutes
Week 3	Discussion 3 videos and slides: (for 6/4) Prerequisite: video 1 of Lecture 5 (finish all videos on thread synchronization) video (part 1 of 2) - 49 minutes (PDF) - warmup #2 (part 1) video (part 2 of 2) - 29 minutes (PDF) - warmup #2 (part 2) live discussion section (6/4) - 13 minutes
Week 4	Discussion 4 videos and slides: (for 6/11) Prerequisite: you should probably only watch these videos when you are done with warmup2 and are ready for kernel assignments video (part 1 of 2) - 22 minutes (PDF) - introduction to kernel assignments (part 1) video (part 2 of 2) - 53 minutes (PDF) - introduction to kernel assignments (part 2) live discussion section (6/11) - 7 minutes
Week 5	Discussion 5 videos and slides: (for 6/18) video (part 1 of 1) - 55 minutes (PDF) - kernel 1, kmain.c live discussion section (6/18) - 12 minutes
Week 6	Discussion 6 videos and slides: (for 6/25) video (part 1 of 1) - 50 minutes (PDF) - more on kernel 1, faber_test.c live discussion section (6/25) - 5 minutes
Week 7	Discussion 7 videos and slides: (for 7/2) video (part 1 of 2) - 52 minutes (PDF) - kernel 2 video (part 2 of 2) - 53 minutes (TXT) - kernel 2 polymorphism, vfs.c, vnode.c, file.c, vfs_syscall.c, vn_mmobj_ops.c, ramfs.c, vfstest.c, faber_fs_test live discussion section (7/2) - 15 minutes
Week 8	Discussion 8 videos and slides: (for 7/9) Prerequisite: you should probably only watch these videos when you are done with kernel 2 and are ready to do phase 1 of kernel 3 video (part 1 of 2) - 60 minutes (PDF) - introduction to kernel 3, the elf32 loader video (part 2 of 2) - 57 minutes (PDF) - more on kernel 3, address space implementation (vmarea, mmobj, pframe, page table) live discussion section (7/9) - 5 minutes
Week 9	Discussion 9 videos and slides: (for 7/16) video (part 1 of 1) - 52 minutes (TXT) - objdump, page fault handling, hello live discussion section (7/16) - 15 minutes
Week 10	Discussion 10 videos and slides: (for 7/23) video (part 1 of 1) - 52 minutes (TXT) - fork(), user space shell live discussion section (7/23) - 3 minutes
Week 11	No discussions this week. (We are covering exactly the same discussions material and doing exactly the same programming assignments as all previous semesters.)

The following are tentative and final slides (in PDF format) for this semester.

• Week 1 (PDF) (5/21) - gdb, warmup #1
• Week 2 (PDF) (5/28) - warmup #1 (part 2)
• Week 3 (part 1 PDF) (part 2 PDF) (6/4) - warmup #2

  Code in slides:

  • defs.h
  • fork-wait.c
  • cat.c
  • redirect.c
  • thr-term.c
  • busywait.c
  • join.c
  • deadlock.c
  • trylock.c
  • whoopee.c
  • status-update.c
  • sigblock.c
  • sigwait.c
  • direct.c
  • cancel.c
  • three-threads.c

• Week 4 (part 1 PDF) (part 2 PDF) (6/11) - introduction to kernel assignments
• Week 5 (PDF) (6/18) - kernel 1, kmain.c

  Code in slides:

  • kmain.c

• Week 6 (PDF) (6/25) - more on kernel 1

  Code in slides:

  • faber_test.c

• Week 7 (7/2)
  • (part 1 PDF) - kernel 2
  • (part 2 TXT) - kernel 2 polymorphism, vfs.c, vnode.c, file.c, vfs_syscall.c, vn_mmobj_ops.c, ramfs.c, vfstest.c, faber_fs_test

  Code (kernel):

  • vfs.c
  • vnode.c
  • file.c
  • vfs_syscall.c
  • vn_mmobj_ops.c
  • ramfs.c (also look for any "_ops_t" in "kernel/include/fs/*.h", "kernel/fs/*.c" and "kernel/fs/ramfs/*.c")
  • vfstest.c
  • faber_fs_test.c

• Week 8 (7/9)
  • (part 1 PDF) - introduction to kernel 3, the elf32 loader
  • (part 2 PDF) - more on kernel 3, address space implementation (vmarea, mmobj, pframe, page table)

  Code (kernel):

  • elf32.c - the elf32 loader
  • exec.c
  • access.c
  • vn_mmobj_ops.c - code for the mmobj inside a vnode
  • syscall.c (in the kernel)

  
  Code (user):

  • syscall.c (in the libc user space library)

  
  Kernel 3 FAQ:

  • meaning of pagenum

• Week 9 (TXT) (7/16) - objdump, page fault handling, hello

  Code (kernel):

  • pagefault.c
  • syscall.c (in the kernel)
  • vn_mmobj_ops.c - code for the mmobj inside a vnode

  
  Code (user):

  • hello.c
  • syscall.c (in the libc user space library)

  
  Kernel 3 FAQ:

  • handle the first page fault
  • meaning of pagenum
  • page faults

  
  Useful Linux commands:

      objdump --disassemble --section=".text" user/usr/bin/hello.exec
      objdump --disassemble --section=".text" -S user/usr/bin/hello.exec
      objdump --headers user/usr/bin/hello.exec
      xxd -g 1 user/usr/bin/hello.exec

  Useful GDB commands:

      add-symbol-file user/usr/bin/hello.exec 0x08048094
      b __libc_static_entry
      b main
      b *0x12345678
      layout asm
      layout next
      si
      info registers
      kernel info vmmap_mapping_info curproc->p_vmmap

• Week 10 (TXT) (7/23) - fork(), user space shell

  Code (user):

  • fork-and-wait.c
  • /sbin/init.c

  
  Kernel 3 FAQ:

  • do_fork()
  • "/sbin/init" not working

  Remaining user space programs:

  Code (user):

  • memtest.c
  • eatmem.c
  • forkbomb.c

  
  Kernel 3 FAQ:

  • dynamic region and do_brk()
  • make forkbomb run forever

• Week 11 (7/30) - (no discussion section this week)

Week #	Date	Topics	Comments
1	5/21	gdb, warmup #1 intro
2	5/28	C, Unix
3	6/4	warmup #2 intro	(warmup #1 due on Tuesday)
4	6/11	multithreading, Unix signals
5	6/18	intro to kernel assignments	(warmup #2 due on Tuesday)
6	6/25	kernel #1
7	7/2	intro to kernel 2	(kernel 1 due on Tuesday)
8	7/9	kernel 2 tests
9	7/16	intro to kernel 3	(kernel 2 due on Tuesday)
10	7/23	objdump, debugging user space processes
11	7/30	(no discussion section this week)	(kernel 3 due on Thursday)