Memory Management

Apuntes

Memory Management Operating Systems Prof. Etson Guerrero Understanding Memory Abstraction and Virtualization in Modern OS Operating Systems 3 O P ERATING SYSTEMS Memory Management Memory Management Background Role of Memory Management: • Track memory usage • Allocate and deallocate memory • Translate logical to physical addresses Key Goals: • Maximize utilization • Minimize access latency • Protect processes from each other 4 O P ERATING SYSTEMS Memory Management Memory Hierarchy & Management Hierarchy: Registers < Cache < RAM < Disk Access Speed & Cost: Faster = more expensive = less capacity Memory Management Activities: • Allocation • Protection • Sharing • Virtualization Memory Management Operating Systems 6 O P ERATING SYSTEMS Memory Management Memory Allocation Fixed - Size Partitioning: • Memory divided into equal blocks • Easy to implement, but internal fragmentation Variable - Size Partitioning: • Partitions based on size of processes • More flexible, leads to external fragmentation Some Allocation Strategies: First Fit, Best Fit, Worst Fit 7 O P ERATING SYSTEMS Memory Management Physical vs. Virtual Memo...