Re: size of page table

[Chandra G K Babu S <scgkiran@cse.iitk.ac.in>]

the answer is 8mb, may be that is a one level page table.
the page size is 4kb (=4k * 1/8 = 1/2kB)
32 bits of virtual address divided as 23+9,
 first 23 bits give the page number,
the 9 bits give the index in a page. the page table have to
 accomdate (2 pow 23) entries so the page table size is 8 mb.

i think this question ha nothing to do with the linux.
any comments?

with regards,
kiran
On Mon, 6 Jan 2003, Rupa wrote:

> 
> Actually this was the question asked in some exam. I do no how to calculate
> size of page table. They had given 4 answers...
> i)16mb ii)8mb
> iii)2mb iv) 24mb
> 
> You have any idea?
> 
> Regards,
> Rupa
> ----- Original Message -----
> From: "Raghu R. Arur" <rra2002@cs.columbia.edu>
> To: "Rupa" <rupa.ramakrishna@ionidea.com>
> Sent: Monday, January 06, 2003 11:47 AM
> Subject: Re: size of page table
> 
> 
> >
> > Hi,
> >
> >  If you are talking about linux, the page table size is not related to the
> > memory size (RAM size). page table is for per process and in linux each
> > process will have 4GB of memory allocated. 3 GB for the user space and 1
> > GB for the kernel space.
> >
> >  HTH,
> > raghu
> >
> > On Mon, 6 Jan 2003, Rupa wrote:
> >
> > > Hello,
> > >     I have small doubt regarding the sizeof page table. Consider a
> machine with 64MB physical memory and a 32 bit virtual address space. If the
> page size is 4kb, what is the approximate size of page table.?
> > > Any help will be useful
> > >
> > > Rupa
> > >
> >
> 
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