July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome 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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Usage of the Dirty and Accessed Bits
A page of information in memory usually originates on mass storage and is copied into memory by the OS's Page Fault handler when a program requires access to one or more locations within the page. Whenever the processor accesses a page, it automatically sets the A (Accessed) bit in the corresponding PTE = 1. On a write to any location within a page, the processor also automatically sets the D (Dirty) bit = 1. Once set, it's the programmer's responsibility to clear the bits (the processor will not clear them). A better name for the Dirty bit would be the Modified bit. When set to one, it indicates that the copy of the page in memory is no longer the same as the original page on mass storage. Of the two, the ...
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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.