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Active and Inactive List LRU. Kernel 2.4 - 2001. 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.
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
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.
Objectives. 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. Background.
Allocating byte sized chunks. Use kmalloc() if you need physically contiguous memory (mostly needed for hardware devices), and vmalloc() if you only need virtually contiguous memory. void * kmalloc(size_t size, gfp_t flags) The function returns a pointer to a region of memory that is at least size bytes in length.
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.
