Memory Management – Thrashing, Segmentation and Paging
... All segments share the same linear address space! This means there is one set of page tables for all segments in a process Segments can overlap in linear address space, too. Rutgers University ...
... All segments share the same linear address space! This means there is one set of page tables for all segments in a process Segments can overlap in linear address space, too. Rutgers University ...
Topic 18: Virtual Memory COS / ELE 375
... Page Tables translate virtual to physical page numbers Misses are call Page faults (handled as an exception) • Retrieve data from disk • Huge miss penalty, pages are fairly large (how big?) • Reducing page faults is important • Can handle the faults in software instead of hardware ...
... Page Tables translate virtual to physical page numbers Misses are call Page faults (handled as an exception) • Retrieve data from disk • Huge miss penalty, pages are fairly large (how big?) • Reducing page faults is important • Can handle the faults in software instead of hardware ...
Special Topics on Operating System
... Load virtual pages that are currently bein used by the executing program Page fault handling Linux uses demand paging to load executable images into a processes virtual memory ...
... Load virtual pages that are currently bein used by the executing program Page fault handling Linux uses demand paging to load executable images into a processes virtual memory ...
Slides10_30
... memory (according to Raymond Kurzweil). A Holographic Versatile Disc (HVD) can hold up to 3.9 terabytes. One hour of uncompressed Ultra High Definition Video (UHDV) consumes approximately 11.5 terabytes of data. The U.S. Library of Congress has claimed that "as of December 31, 2005, the Library has ...
... memory (according to Raymond Kurzweil). A Holographic Versatile Disc (HVD) can hold up to 3.9 terabytes. One hour of uncompressed Ultra High Definition Video (UHDV) consumes approximately 11.5 terabytes of data. The U.S. Library of Congress has claimed that "as of December 31, 2005, the Library has ...
08 Operating System Support
... internal security e.g. database —Some instructions only work in level 0 ...
... internal security e.g. database —Some instructions only work in level 0 ...
Main Memory
... • Not limited to small number of segments • Think of this as providing a large number (thousands) of fixedsized segments (called “pages”) ...
... • Not limited to small number of segments • Think of this as providing a large number (thousands) of fixedsized segments (called “pages”) ...
Main Memory
... • Program must be brought (from disk) into memory and placed within a process for it to be run • Main memory and registers are only storage CPU can access directly • Register access in one CPU clock (or less) • Main memory can take many cycles • Cache sits between main memory and CPU registers • Pro ...
... • Program must be brought (from disk) into memory and placed within a process for it to be run • Main memory and registers are only storage CPU can access directly • Register access in one CPU clock (or less) • Main memory can take many cycles • Cache sits between main memory and CPU registers • Pro ...
Test1: Spring 2017 (Hint)
... Q5A. Given five memory partitions of 100 KB, 500 KB, 200 KB, 300 KB, and 600 KB (in order), how would each of the first-fit, best-fit, and worst-fit algorithms place processes of 212 KB, 417 KB, 112 KB, and 426 KB (in order)?Which algorithm makes the most efficient use of memory? Ans. We label the ...
... Q5A. Given five memory partitions of 100 KB, 500 KB, 200 KB, 300 KB, and 600 KB (in order), how would each of the first-fit, best-fit, and worst-fit algorithms place processes of 212 KB, 417 KB, 112 KB, and 426 KB (in order)?Which algorithm makes the most efficient use of memory? Ans. We label the ...
Memory Management
... The referenced bit says whether the page has been accessed recently The modified bit says whether or not the page is dirty it is set when a write to the page has occurred ...
... The referenced bit says whether the page has been accessed recently The modified bit says whether or not the page is dirty it is set when a write to the page has occurred ...
Operating Systems
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
Operating Systems
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
William Stallings Computer Organization and Architecture
... • Protection bits give 4 levels of privilege —0 most protected, 3 least —Use of levels software dependent —Usually level 3 for applications, level 1 for O/S and level 0 for kernel (level 2 not used) —Level 2 may be used for apps that have internal security e.g. database —Some instructions only work ...
... • Protection bits give 4 levels of privilege —0 most protected, 3 least —Use of levels software dependent —Usually level 3 for applications, level 1 for O/S and level 0 for kernel (level 2 not used) —Level 2 may be used for apps that have internal security e.g. database —Some instructions only work ...
William Stallings Computer Organization and Architecture
... • Protection bits give 4 levels of privilege —0 most protected, 3 least —Use of levels software dependent —Usually level 3 for applications, level 1 for O/S and level 0 for kernel (level 2 not used) —Level 2 may be used for apps that have internal security e.g. database —Some instructions only work ...
... • Protection bits give 4 levels of privilege —0 most protected, 3 least —Use of levels software dependent —Usually level 3 for applications, level 1 for O/S and level 0 for kernel (level 2 not used) —Level 2 may be used for apps that have internal security e.g. database —Some instructions only work ...
Disco: Running Commodity Operating Systems on Scalable
... (scalable shared memory multiprocessors Requires significant changes to system software to support hardware advantages (i.e. Partitioning OS up into units and others) Since modern system software is so large this requires large amounts of development time ...
... (scalable shared memory multiprocessors Requires significant changes to system software to support hardware advantages (i.e. Partitioning OS up into units and others) Since modern system software is so large this requires large amounts of development time ...
08_Operating System Support
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
William Stallings Computer Organization and Architecture
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
William Stallings Computer Organization and Architecture
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
William Stallings Computer Organization and Architecture
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
William Stallings Computer Organization and Architecture
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32bit offset • 2 bits of segment are protection mechanism ...
Operating Systems
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
Operating Systems
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
... Pentium II Segmentation • Each virtual address is 16-bit segment and 32-bit offset • 2 bits of segment are protection ...
Memory management unit
A memory management unit (MMU), sometimes called paged memory management unit (PMMU), is a computer hardware unit having all memory references passed through itself, primarily performing the translation of virtual memory addresses to physical addresses. It is usually implemented as part of the central processing unit (CPU), but it also can be in the form of a separate integrated circuit.An MMU effectively performs virtual memory management, handling at the same time memory protection, cache control, bus arbitration and, in simpler computer architectures (especially 8-bit systems), bank switching.