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Page Tables and Virtual Memory Page tables can be very large (32 ... Natural unit for protection purposes No internal fragmentation Disadvantage: ...
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An array of page table entries, indexed by virtual page number ... Worst of both worlds, pretty much never used. 11/11/09. 22. Virtually Addressed, Physically Tagged ...
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Page size is a power of two typical size is 4kbytes ... the Translation Lookaside Buffer that is overwritten by the allocation itself. ...
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First copy all our shell code to a known location ... Zero area will serve as good empty Lookaside space. If Lookaside is remapped over non zero area, we need ...
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... still can't find any free entry, extend heap as ... If the chunk 1K and the lookaside is full, put it on the free list ... Heap header cookie calculation ...
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Title: Memory Management Author: Mario Marchand Last modified by: hawkey Created Date: 9/19/1996 3:07:26 PM Document presentation format: On-screen Show
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Title: Reliable Windows Heap Exploits Author: Ohorovitz Last modified by: blah Created Date: 3/25/2004 6:59:27 AM Document presentation format: On-screen Show
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Operating Systems CMPSCI 377 Lecture 2: OS & Architecture Emery Berger University of Massachusetts, Amherst
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What we will learn from chapter ? 2. Introduction 3. Moving From An MPU To An MMU 4. ... // Cache and write buffer attribute unsigned int pAddress; ...
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If size = 512K, virtual memory is used (not on heap) If 1K, ... Requested size is 1K (to fit the table) ... We must be the first one to allocate that size ...
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UT HEAPS. HEAPS ABO. Windows 2003. Windows 2003 SP2. Still most widely used windows server OS ... Still not a lot of heap exploits released. Still not a lot of ...
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memory images kept in secondary storage; ... 1-KB subpages for 4-Kbyte pages. Separate instruction and data MMUs. Can be disabled separately ...
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Virtual Memory Chapter 8
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Energy Efficiency and Storage Flexibility in the Blue File System Edmund B Nightingale Jason Flinn University of Michigan
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Energy Efficiency and Storage Flexibility in the Blue File System ... Sobti et al] Cooperative I/O ... Kernel Intercepts Linux VFS calls Communicates with ...
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Review CPSC 321 Andreas Klappenecker Announcements Tuesday, November 30, midterm exam Cache Placement strategies direct mapped fully associative set-associative ...
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Virtual Memory. Shaheen Gandhi. e-mail: sgandhi@andrew.cmu.edu. Office Hours: ... Virtual Memory and Caches are two separate things, but they draw on the same ideas ...
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program relocation. protection. Pages: virtual memory blocks ... have test programs that exercise all instruction. have a full report that explains your design ...
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Applications for arbitrary memory overwrite exploitation demos ... DCOM (seems to be the inflection point), Messenger, MSMQ, Script Engine ...
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Allocating Memory Ted Baker Andy Wang CIS 4930 / COP 5641
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Title: CSE 431. Computer Architecture Subject: Lecture 19 Author: Janie Irwin Last modified by: chi Created Date: 8/19/1997 4:58:46 PM Document presentation format
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Title: Cache writes and examples Subject: CS232 @ UIUC Author: Howard Huang Description 2001-2003 Howard Huang Last modified by: cse Created Date
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Mondriaan Memory Protection Emmett Witchel Krste Asanovic MIT Lab for Computer Science
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CSCI 4717/5717 Computer Architecture Topic: Memory Management Reading: Stallings, Sections 8.3 and 8.4 Recursion Many complex algorithmic functions can be broken into ...
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2. Memory may contain parts of program which are not used during a run (ie. ... Catenate. Virtual memory address. Ceng 334 - Operating Systems. 3.2-15 ...
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Page table overhead increases with address space size. Page tables get too big to fit in memory! ... Many peta-bytes per process page table. Inverted page tables ...
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memset(dptr- data[s_pos], 0, scullc_quantum); To release memory. for (i = 0; i qset; i ) ... memset(dptr- data[s_pos], 0, PAGE_SIZE dptr- order); A scull ...
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Operating Systems Memory management
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Mikhail Chupilko, Alexander Kamkin, and Dmitry Vorobyev. Institute for System ... the creation of specifications and tests for Verilog designs using CTESK ...
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Models of Desktop Portability. Laptops. Roaming profiles. Remote desktop. Laptops. Laptops are ... Fingerprint for every 16K chunk in remote virtual disk ...
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(no is serijas nak nosaukums 'Big Blue', i ir daudz gan zagta, gan ' ... 1. Modules that were loaded under the current task (LLEs) 2. The job pack area (JPA) ...
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Wolverine. Linux Kernel. Linux File Cache. USBStick ... Communicates with Wolverine through pseudo-device driver ... Operations redirected to Wolverine ...
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The task of subdividing the user area is carried out dynamically by the OS -- memory management ... is divided in segments and loaded in dynamic partitions ...
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Simple Batch Systems. Resident Monitor program. Users submit jobs to operator. Operator batches jobs. Monitor controls sequence of events to process batch ...
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time 0 1 2 3 4 5 6 7 8 9 10. 11/28/09. CHAPTER 8. 13. FIFO ... Processor Utilization. Value L /S = 1. CPU. 11/28/09. CHAPTER 8. 20. FIGURE 8-12. Lifetime Curve ...
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Use PC to get VIRTUAL address. Lookup VIRTUAL address in TLB. MISS OS Trap ... Virtual Address Translation. 11/16/09. Comp 120 Fall 2001. 6. 16k direct-mapped cache ...
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The flow obeys Darcy's Law. Two-dimensional. Steady state. 6. Mathematical formulation. Darcy's Law: Potential Function: Velocity Components: Continuity Equation: ...
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Fast & data sharing is convenient. ... Placing every possibly shared data on its own page is very difficult. ... protection and data sharing. MMP uses linear ...
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Not always (small segments may transfer ... Second-chance. Clock. Least recently used (and variants of it) Random. Ageing. Not recently used ... Second-chance ...
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DRAM is too slow for many purposes. Compromise. Build a memory hierarchy. Locality ... compromise between the two extremes above. Cache Types. Set Associative Caches ...
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Memory Management Fundamentals Virtual Memory ...
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Title: Main Tasks Author: Winnie IDA Last modified by: Gert Jervan, ESLAB/SaS/IDA, Link pings Universitet Created Date: 8/31/1998 10:45:28 AM Document presentation ...
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Primitive operating systems (such as MS- DOS and CP/M) provide some interfaces ... (b) Best-Fit Strategy. Place job in the smallest possible hole in which it will fit. ...
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Memory Hierarchy Page 520 The technology we used to build our memory hierarchy can be divided into ...
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huge miss penalty, thus pages should be fairly large (e.g., 4KB) ... Nightmare Scenario: ping pong effect! Capacity Misses: increase cache size. Cache Design Space ...
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Title: 08 Operating System Support Author: Adrian J Pullin Last modified by: lcrum Created Date: 4/23/1999 3:59:55 PM Document presentation format
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Project 4: Interfacing GNU debugging tool with on-board emulator (Komodo) ... debugging tool with on-board emulator program to facilitate source-level ...
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Impact of Java Compressed Heap on Mobile/Wireless Communication ... as of a Jar file: eliminate redundancy) 2. Java bytecode factorization [Clausen et al.'00] ...
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Each MULTICS program has a segment table, with one descriptor per segment. ... Conversion of a 2-part MULTICS address into a main memory address ...
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Identify the race condition in this version of the consumer/producer problem. ... The race condition occurs when the variable out is accessed since this is now ...
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one to fetch the page table. one to fetch the data ... Fetch Policy. Fetch Policy. Determines when a page should be brought into memory ...
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Current Systems have only a couple rings of protection ... Protection Check in Parallel with Standard Pipeline ... to represent the delays for protection lookup ...
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Miss penalty 40 cycles for all misses ... huge miss penalty, thus pages should be fairly large (e.g., 4KB) ... Incredible high penalty for a page fault ...
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Bring photo id. Write name on all answer books. Closed book. Closed notes. ... If in doubt, make an assumption and write it down. Be concise. ...
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Explorer 20MB. 40 More Processes! Page the page tables! Have to look up ... 8. What is in the page table? Address = upper bits of physical memory address OR ...
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Want to also avoid internal fragmentation. This is when memory is handed out in some fixed way ... Section09-Memory_Management Author: JB Last modified by:
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