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Linux has to deal with two shortcomings of hardware with respect to memory addressing: Some hardware devices can perform DMA (direct memory access) to only certain memory addresses.
Address space one more time! We covered how the following fit into the virtual address space: program break. file-backed mappings (e.g. shared C std library) anonymous mappings. kernel code & data. Checking the mappings. Run prog and cat /proc/<pid>/maps. Some regions of interest: Program code/text/static regions (notice file path) Program heap.
Linux Memory Management. Virtual memory layout: a closer look. Applications require memory with different properties. access permissions sharing file backed vs. anonymous dynamically sized . /proc/{pid}/maps and mmap() system call. Why OS should worry how user-space virtual addresses are managed?
W4118: Linux memory management. Instructor: Junfeng Yang. References: Modern Operating Systems (3rd edition), Operating Systems Concepts (8th edition), previous W4118, and OS at MIT, Stanford, and UWisc. Page tables are nice, but ... Page tables implement one feature: mapping vitual pages to physical pages. Wanted: other memory management features
This book gives a detailed tour of the Linux VM as implemented in 2.4.22 and gives a solid introduction of what to expect in 2.6.Aswellasdiscussing the implementation, the theory that Linux VM is based on will also be introduced.
An Introduction to Linux memory management. The basics of paging. Understanding basic hardware memory management and the difference between virtual, physical and swap memory. How do determine hardware installed and how to figure out how processes use that memory. How a process uses physical and virtual memory effectively.
Four library functions form the basis for dynamic memory management from C. We describe them first, followed by descriptions of the two system calls upon which these library functions are built.
