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+ Operating system needed to check if routine is in processes’ memory address. + Dynamic linking is particularly useful for libraries. Memory Management Performs the above operations.
This chapter will introduce the concept of memory management and discuss its importance in operating systems. Memory management is the process of controlling and coordinating the use of computer memory to allow the efficient execution of programs and the sharing of memory among multiple processes.
• effective organization of operating memory management. The size of the operating memory for operating system code is usually fixed, but the allocation process for user processes is usually much more complicated.
To make the students understand the basic operating system concepts such as processes, threads, scheduling, synchronization, deadlocks, memory management, file and I/O subsystems and protection.
Contiguous Allocation. Main memory usually into two partitions: Resident operating system, usually held in low memory with interrupt vector. User processes then held in high memory. Relocation registers used to protect user processes from each other, and from changing operating-system code and data.
Background. Executable programs are loaded into memory from disk. Main memory and registers are the only storage CPU can access directly. Memory unit only sees a stream of: addresses + read requests, or. address + data and write requests. Register access is done in one CPU clock (or less)
Virtual memory basics. Survey techniques for implementing virtual memory. ♦ Fixed and variable partitioning. ♦ Paging. ♦ Segmentation. Focus on hardware support and lookup procedure. ♦ Next lecture we’ll go into sharing, protection, efficient implementations, and other VM tricks and features.
