single.dvi 18 Paging: Introduction It is sometimes said that the operating system takes one of two approaches when solving most any space-management problem. The first approach is to chop things up into variable-sized pieces, as we saw with segmenta- tion in virtual memory. Unfortunately, this solution has inherent difficul- ties. In particular, when dividing a […]
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single.dvi 23 Complete Virtual Memory Systems Before we end our study of virtualizing memory, let us take a closer look at how entire virtual memory systems are put together. We’ve seen key elements of such systems, including numerous page-table designs, inter- actions with the TLB (sometimes, even handled by the OS itself), and strategies for
20 Paging: Smaller Tables We now tackle the second problem that paging introduces: page tables are too big and thus consume too much memory. Let’s start out with a linear page table. As you might recall1, linear page tables get pretty big. Assume again a 32-bit address space (232 bytes), with 4KB (212 byte) pages
single.dvi 6 Mechanism: Limited Direct Execution In order to virtualize the CPU, the operating system needs to somehow share the physical CPU among many jobs running seemingly at the same time. The basic idea is simple: run one process for a little while, then run another one, and so forth. By time sharing the CPU
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Lecture 10 CS 111: Operating System Principles Page Tables 1.0.1 Jon Eyolfson April 20, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Virtualization Fools Something into Thinking it Has All Resources “LibreOffice Memory” 0x0000000000080000 0x00000000FFFF0000 Start “Firefox Memory” 0x0000000000080000 0x00000000FFFF0000 Start 1 Virtual Memory Checklist □ Multiple processes
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Week 1 – Part 2 Deakin University CRICOS Provider Code: 00113B SIT182 – Real World Practices For Cyber Security Trimester 2 – 2021 Deakin College Week 1 – Part 2 Deakin University CRICOS Provider Code: 00113B Understanding “Cybersecurity” Deakin University CRICOS Provider Code: 00113B What makes Cybersecurity a distinct subject? 3 What makes a problem
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Lecture 14 CS 111: Operating System Principles Locks 1.0.2 Jon Eyolfson May 6, 2021 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License cba http://creativecommons.org/licenses/by-sa/4.0/ Data Races Can Occur When Sharing Data A data race is when two concurrent actions access the same variable and at least one of them is a
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[537] TLBs Virtualizing Memory: Faster with TLBS Questions answered in this lecture: Review paging… How can page translations be made faster? What is the basic idea of a TLB (Translation Lookaside Buffer)? What types of workloads perform well with TLBs? How do TLBs interact with context-switches? CSE 2431 Introduction to Operating Systems Based on slides
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[537] Smaller Page Tables Virtualizing Memory: Smaller Page TAbles Questions answered in this lecture: Review: What are problems with paging? Review: How large can page tables be? How can large page tables be avoided with different techniques? Inverted page tables, segmentation + paging, multilevel page tables What happens on a TLB miss? CSE 2431 Introduction
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02 Computer Evolution and Performance COMP228: System Hardware Tutorial Chapter #04: MARIE General Purpose Register (GPR) Architecture Its functional units are: Data Registers: D0, D1, D2,…, D7 for arithmetic operations – holds any kind of data Address Registers: A0, A1, A2,…, A7 serve as pointers to memory addresses Working Registers: several such registers – serve
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