Permanently resident pages - main memory, Computer Engineering

Assignment Help:

Permanently resident pages:

Every virtual memory systems have memory areas that are "pinned down", for example cannot be swapped out to secondary storage, for instance:

  • Interrupt mechanisms usually rely on an array of pointers to the handlers for different types of interrupt (I/O completion, program error, timer event, page fault, etc.). If the pages containing these pointers or the code that they invoke were page able, interrupt-handling would become even more complicated and time-consuming; and it would be especially hard in the case of page fault interrupts.
  • The page tables are typically not page able.
  • Data buffers that are accessed outside of the CPU, for instance by peripheral devices that use direct memory access (DMA) or by I/O channels. Typically such devices and the buses (connection paths) to which they are connected use physical memory addresses rather than virtual memory addresses. Even on buses  with  an  IOMMU,  that  is  a  special  memory  management  unit  that  may  translate  virtual addresses used on an I/O bus to physical addresses that transfer can't be stopped if a page fault take place and then restarted when the page fault has been processed. So pages that contain locations to which or from which a peripheral device is transferring data are either enduringly pinned down or pinned down whilst the transfer is in progress.
  • Timing-dependent kernel/application cannot stand the varying response time caused by paging.

1356_Permanently resident pages.png


Related Discussions:- Permanently resident pages - main memory

Show the decimal equivalent of a binary number, Q. Show the Decimal equival...

Q. Show the Decimal equivalent of a binary number? In binary numbers we have two digits 0 and 1 in addition they can also be signified as a string of these two-digits known as

Arrow keys - input commands, When the user is inputting commands into your...

When the user is inputting commands into your shell, it should identify the left, right , up and down arrow keys. To implement this, you will need to use the termios.h library to

How two domain servers having same set of names, Does it makes sense for tw...

Does it makes sense for two domain servers to contain exactly the same set of names? Why or why not? Yes. This is very advantageous for 2-domain servers having same set of name

Zero address instruction format, Zero address instruction format is used fo...

Zero address instruction format is used for  (A) RISC architecture.      (B) CISC architecture.  (C) Von-Neuman architecture.   (D) Stack-organized architecture.

Control hazard and delayed branching, Described Instruction or control haza...

Described Instruction or control hazard? Ans: The pipeline can be stalled due to delay in the availability of an instruction. For instance, this may be a result of a miss in t

Microprocessor, can i get the comparison of microprocessors architecture?

can i get the comparison of microprocessors architecture?

Describe data structures used during passes of assembler, Describe Data str...

Describe Data structures used during passes of assembler and their use. During passes of assembler, the Data structures define as: Pass 1 data base Input source pro

Goals - artificial intelligence, Goals - artificial intelligence: One ...

Goals - artificial intelligence: One desirable way to make perfect an agent's performance is to enable it to have some details of what it is trying to complete. If it is given

Conversion of decimal number 10.625 into binary number, Conversion of decim...

Conversion of decimal number 10.625 into binary number ? Ans. There is integer part is 10 and fractional part is 0.625. Firstly convert the decimal number 10 in its equal bina

Determine reduced boolean equation and the karnaugh map, Determine reduced ...

Determine reduced Boolean equation and the Karnaugh Map? Illustration : Determine reduced Boolean equation and the Karnaugh Map for the truth table shown below:

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd