L-5.19: Virtual Memory | Page fault | Significance of virtual memory | Operating System
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- เผยแพร่เมื่อ 10 เม.ย. 2018
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Virtual Memory is a storage mechanism which offers user an illusion of having a very big main memory. It is done by treating a part of secondary memory as the main memory. In Virtual memory, the user can store processes with a bigger size than the available main memory.
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A process is divided into multiple pages and placed in frames of the main memory. but if the number of pages is greater than the number of frames then all the pages cannot be fit into the frames available. Hence some pages of the process wouldn't be in a frame but would be in hard disk. Hence when cpu requests for such a page,the page table entry holding the frame number for that page would be empty since it's not yet loaded to a frame in the main memory and is still in the hard disk.It would also have its valid bit set to 0 => invalid page because its in hard disk and not main memory.This causes page fault.
This page fault generates a trap and hence the mode bit changes from user to kernel or OS mode.Then the OS fetches this page from the hard disk and places it in a frame using Replacement algorithm if no free frame available in the main memory.Then it updates the page table entry and valid bit.It sets the frame number where the page was placed and the valid bit is set to 1.
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00:03 Virtual memory provides illusion of executing larger processes than main memory size
02:32 Virtual memory allows bringing only required processes/pages into main memory.
05:24 Virtual memory allows bringing processes into limited main memory without restriction on process size or number.
07:29 Virtual memory uses page tables to map logical addresses to physical addresses.
10:09 Interrupts cause context switching from user to the OS
12:53 Virtual memory management process overview
15:37 Virtual memory reduces page faults by allowing quicker access to the main memory.
18:07 Virtual memory reduces main memory access time
Amazingly explained each concept
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