Virtual memory

[kavitha...@gmail.com]

Hi 

I want to know about virtual memory, I have heard people saying that virtual memory is nothing but the harddisk, some part of the code is mapped to primary memory and the process starts running.

I feel that the harddisk cannot be a VM , VM is program which uses harddisk to make room for other process, by swapping the idle(inactive) programs from RAM to harddisk.

VM does not exists physically, so whatever the contiguous address we get during running programs its just the generated virtual address (which does not point to any physical device) with the help of MMU are mapped to RAM. Am I correct over here.

Kavitha

[vishwanath m]

HI Kavitha,

yes that is not a real memory , actually all process will assume it has full available memory which can be used for its operations and there is definite start address for an process start i,e main function address is always fixed. internally MMU will take care of mapping this VM to physical table using the address translation .

This may help , please read the attached doc which is really good doc.

regards,

Vishwa

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[kavitha srinivas]

Hi Vishwa,

Thanks for the reply and for the doc.

Regards

Kavitha