Performance Analysis
High-level overview of measuring and tuning system performance: open and closed loop testing, queueing theory, Little’s Law, thread pools, sliding windows.
Device Driver and Block I/O in xv6
Covers file system layers: device driver communication with disk controller, buffer cache management, block read/write operations, and logging for crash consistency.
Sleep and Wakeup in xv6 – Missed Wakeup Prevention and Synchronization
Describes sleep/wakeup mechanism for process synchronization in xv6: channels, spinlocks, examples with pipes and wait/exit, missed wakeup prevention.
Locking in xv6
Explains spinlock implementation using xchg instruction, interrupt disabling, ptable.lock across context switching, and critical section protection.
Memory Management of User Processes
Details process memory management in xv6: page table construction, fork memory copying, sbrk heap expansion, and exec system call memory setup.