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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.
OS08b: Virtual Memory with Linux This PDF document is an inferior version of an OER HTML page; free/libre Org mode source repository. Author: Jens Lechtenbörger Subject: Demo for looking at memory usage with Linux: proc and smem Keywords: operating system, virtual memory, paging, Linux, proc, smem Created Date: 20240903150710Z
The active page LRU preserves the the active memory working set. Only the inactive LRU loses information as fast as use-once I/O goes. Works well enough also with an arbitrary balance. Active/inactive list optimum balancing algorithm was solved in 2012-2014.
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. How to control overcommit and virtual and/or physical memory limits.
1. Looking at Memory with Linux. (Specifics of Linux are not part of learning objectives. However, the following illustrates shared memory, and the pseudo-filesystem /proc will be revisited in other presentations.) 1.1. Linux Kernel: /proc/<pid>/ /proc is a pseudo-filesystem. See https://man7.org/linux/man-pages/man5/proc.5.html.
Define virtual memory and describe its benefits. Illustrate how pages are loaded into memory using demand paging. Apply the FIFO, optimal, and LRU page-replacement algorithms. Describe the working set of a process, and explain how it is related to program locality. Describe how Linux manages virtual memory.
64-bit Linux allows up to 128 TB of virtual address space for individual processes, and can address approximately 64 TB of physical memory. While assigning memory to a process is relatively cheap, memory management is not! Every memory access requires a page walk. Typically take 10 to 100 cpu cycles.
