December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Virtual Memory
The RAM in a computer system is a limited resource, with all of the running processes on the system competing for a share of it. When there are multiple applications running on a system, it is not unusual for the total amount of memory allocated by all processes to exceed the amount of RAM on the system.
An operating system that supports virtual memory allows a process to allocate and use more memory than the amount of RAM installed on the system; that is, the address space of a process is not constrained by the amount of physical RAM. With virtual memory, the operating system uses a backing store on secondary storage, such as the hard disk, to keep portions of a process address space that will not fit into RAM. The CPU, however, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.