Covers OS performance measurement techniques. Explains performance metrics (throughput, latency, utilization), measurement tools (profilers, benchmarks), workload characterization, bottleneck analysis, and techniques for improving system performance.
Introduces file systems and persistent storage. Covers file abstractions, directories, file operations (open, read, write, close), file descriptors, disk organization with tracks and sectors, and file allocation methods (contiguous, linked, indexed).
Covers memory paging mechanisms for address translation. Explains page tables with page table entries (PTEs), multi-level page tables for space efficiency, translation lookaside buffer (TLB) for caching translations, page faults, and integration with virtual memory swapping.
Covers socket programming for network communication. Explains Unix domain and Internet sockets, TCP (connection-oriented) and UDP (connectionless) sockets, socket API (socket, bind, listen, accept, connect, send, recv), and concurrent server architectures using multi-threading and event-driven I/O.
Details xv6 process management implementation. Covers struct proc (PCB in xv6), page table for virtual-to-physical address mapping, kernel stack for system calls, file descriptor table for open files, and process table (ptable) structure.