🦕Operating System

오버헤드란?프로그램의 실행흐름 도중에 동떨어진 위치의 코드를 실행시켜야 할 때 , 추가적으로 시간,메모리,자원이 사용되는 현상입니다정의: 최소한의 Hardware(CPU + Memory) 위에 Software가 동작하는 기계Embedded System : 특정 목적을

System call, Compiling Process, Micro Kernel v/s Monolithic Kernel, Kernel History

Program vs Process, Process State, PCB, Context Switching, Scheduler, Operations on Processes, fork, exec, MultiProcess, IPC, Memory Map

Thread, Single Thread, Multi Thread, Multi Programming, Parallel Programming, Thread History, Kernel Thread, Multi Thread Models, Thread issue

CPU burst vs I/O burst, Dispatcher, Preemtive vs non-preemptive, Scheduling Criteria, Scheduling Goals, Scheduling Algorithms (FIFO, SJF, ... )

Synchronization, Synchronization Problem, Critical Section, Race Condition, Requirements for Synchronization Tools, Lock, Semaphore, Monitors

Handling Deadlocks, Deadlock Characterization

Memory Management, Paging, VM, Contiguous Allocation, Fragmentation, Hole, Paging, Page Table, Segmentation

Virtual Memory, Demand Paging, Swap in/out, Page Fault, Page Replacement Algorithms, Thrashing

NAS, SAN, HDD, Disk scheduling Algorithms, RAID

I/O method, Direct I/O, Memory-Mapped I/O, Kernel I/O Structure, Goals of I/O Software, I/O Systems Layers

File system, File Operation, File Types, File Access, Directories, Protection

File System Implementation, In-Memory Structure, Virtual File System, Layered File System, On-Disk Structure, Free-Space Management, Directory Implem

Computer Security AS Cryptography, Security requirement triad (CIA Triad), Security Problem, The Morris Internet Worm, Shared key cryptography, ....