COMP 3000 Operating Systems Memory Management (part 2) Lianying Zhao Page Table “Walk” • Page Global Directory (PGD) • P4D (Page Directory Level 4) • Page Upper Directory (PUD) • Page Middle Directory (PMD) • Page Table Entry (PTE) • Offset into a page frame COMP 3000 (Winter 2021) 2 Page Table “Walk” (CONT’d) COMP […]
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COMP 3000 Operating Systems Kernel Modules (part 1) Lianying Zhao When do We Need to Modify the Kernel? • We need to change/improve the kernel functionality • E.g., adding support for new devices, new file systems, and ad-hoc changes • Security • We see some security issue/vulnerability, and addressing it needs kernel support • Recall:
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COMP 3000 Operating Systems Further into the Abstractions (part 1) Lianying Zhao What Makes Abstraction/Virtualization Possible? • The abstraction creator/enforcer must be: • “Omnipotent”, that always has a higher privilege than the target • “Omniscient”, that sees everything about the target • All this leads to the requirement for hardware support COMP 3000 (Winter 2021)
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COMP 3000 Operating Systems Introduction to Operating Systems (part 2) Lianying Zhao User Interface • Command line (not inferior!) • Text UI • E.g., the “Green Screen Monster” – Mainframes • DOS, etc. • GUI (Graphical User Interface) • E.g., X-Window COMP 3000 (Winter 2021) 2 Security & Robustness • Containing errors • Application crashes
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Andrew login ID: Full Name: Recitation Section: CS 15-213, Fall 2008 Exam 1 Thurs. September 25, 2008 Copyright By PowCoder代写 加微信 powcoder Instructions: • Make sure that your exam is not missing any sheets, then write your full name, Andrew login ID, and recitation section (A–H) on the front. • Write your answers in the
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Recall:Too Much Milk Solution #3 • Here is a possible two-note solution: Thread A Thread B leave note A;leave note B; while (note B) {\\X if (noNote A) {\\Y Copyright By PowCoder代写 加微信 powcoder do nothing; if (noMilk) { } buy milk; if (noMilk) { } buy milk; } } remove note B; remove note
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Introduction to Computer Systems 15-213/18-243, spring 2009 1st Lecture, Jan. 12th Data representation II Copyright By PowCoder代写 加微信 powcoder Acknowledgement: These slides are based on the textbook (Computer Systems: A Programmer’s Perspective) and its slides. Our focus today: “How is real number stored in memory?” “How is floating-point number stored in memory?” #include int main()
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CS162 Operating Systems and Systems Programming Lecture 14 Memory 2:Virtual Memory (Con’t), Caching and TLBs March 8th, 2022 Prof. and http://cs162.eecs.Berkeley.edu Copyright By PowCoder代写 加微信 powcoder Recall: General Address translation Virtual Addresses Physical Addresses Untranslated read or write • Consequently, two views of memory: – View from the CPU (what program sees, virtual memory) –
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Computer Science 162 University of California, Berkeley Quiz 3 August 3, 2020 Name Student ID Copyright By PowCoder代写 加微信 powcoder This is an open-book exam. You may access existing materials, including online materials (such as the course website). During the quiz, you may not communicate with other people regarding the quiz questions or answers in
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ECE 391 Exam 1, Spring 2012 Thursday February 23rd Name: • Be sure that your exam booklet has 16 pages. • Write your name at the top of each page. • This is a closed book exam. • You are allowed one 8.5 × 11″ sheet of notes. • Absolutely no interaction between students is
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