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 > > > > > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- A 105, Hall-IV IIT Kanpur, Pin- 208016, Phone # Dept. (0512) 597653, Hostel (0512) 597114, 597314 -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
