Hi,
--- Preetham <pdn@xxxxxxxxxx> wrote:
>
> Hi Prasann,
> I would like to know if each
> and every process
> created on the system would use paging?
>>Yes definately.
> I also wanted to know how the addresses are mapped
> when a process is
> created?
>>Each process has given all 4GB address space(in case
of 32 bit processors,these all are called virtual
address,this is called flat addressing from the fact
that segmentation is disabled(in the sense the base
address of all segments are 0)
Each process structure got mm_struct memory descriptor
which points to VMA's(Virtula memory area) the memory
maps in which process has permission to
read/write/execute see cat /proc/pid/maps..and more
You read it in the Docs provided in directory
linux/Documentation.And Rather ask for difficulty in
case you won't understand.
> and are these addresses virtual or actual....and
> when do virtual addresses
> come into pictures.
> Thank You.
> .
> ----- Original Message -----
> From: "prasanna wakhare" <prasannawakhare@xxxxxxxxx>
> To: "paging queries" <pdn@xxxxxxxxxx>
> Cc: <kernelnewbies@xxxxxxxxxxxx>
> Sent: Friday, July 30, 2004 4:20 PM
> Subject: Re: Paging Queries
>
>
> > hi,
> > Do u want to say that the address in yr example
> > program
> > go through tha page table?
> > if yes then i would clear you that each and every
> > address issued by processor always go through
> > page tables,(forget about cache etc ),
> > becoz linux and every modern OS enables paging at
> very
> > start when it starts in real mode(X86) ,
> > I think you can find the code of enabling the
> paging
> > bit(I think in CR0)
> > register in head.S in linux,in which processor
> > switches
> > from direct address to page table
> addressing(forget
> > about
> > segmentation again u wont disable in intel
> processors
> > )
> > you should read code of switching from real to
> > protected its very interesting code further any
> doubts
> > their u raise on the list.
> > Prasanna
> >
> >
> >
> >
> > --- paging queries <pdn@xxxxxxxxxx> wrote:
> >
> > >
> > > I would want to know if a simple program like
> this
> > > would use paging or not.
> > > Is it possible for this program to make use of
> > > paging.
> > > void main()
> > > {
> > > printf("hi");
> > > }
> > >
> > > What are the citerias for the os to force
> paging...
> > > Can user force a program to be paged?
> > > Can you give me an example when a user can make
> use
> > > of paging?
> > > I have tons of doubts on these please clarify.
> > > Thank You.
> > > --
> > > .
> > >
> > >
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