Session 03,04 03.VirtualMemory

spatlou

You are invited to put is queries/resolutions/advice/articles about Virtual Memory here...

ankitvats846

Doubts :-

1) 32 bit machine means process have address space of 2^32 ??

2) page as well as offset will goes to translate into physical address??

int a =5 ; means complete page going to translate??

3) when power on a system which one run first a proccess or mmu??

4) page acquire only 1 byte in mapping table ?? (16 * 2 * 8 = 256 byte)??

5) if two process have same page than what happened with page frame??

6) can os address translation may fail ?? if yes , in what situation??

7) In modern laptop ,upgrade configuration limited lets say "upto 16gb of ram is supported"??

spatlou

1) 32 bit machine means process have address space of 2^32 ??

This means there are 2^32 addresses. (virtual Addresss)

spatlou

2) page as well as offset will goes to translate into physical address?? This is correct.

int a =5 ; means complete page going to translate??

One page (atleast) will be allocated(actually 130 kb of memory will be allocated). Out of which only 4 bytes are occupied by int a.

spatlou

3) when power on a system which one run first a proccess or mmu??

spatlou

4) page acquire only 1 byte in mapping table ?? (16 * 2 * 8 = 256 byte)??

page Table entries consists of VirtualAddress-->PhsicalAddress Mappings. Every mapping occupies 2 Byte(on 32 bit machines).

spatlou

5) if two process have same page than what happened with page frame??

The contents of page are copied into Virtual address spaces of both the processes.

But, if shared objects are created then one pages contents could be shared by both processes.