Re: is there a limit on bss size?

[Petko Manolov]

Philipp Rumpf wrote:
> 
> On Thu, Oct 05, 2000 at 04:30:35PM +0100, Tigran Aivazian wrote:
> > Hi,
> >
> > I put a simple construct in kernel/sched.c like this:
> >
> > struct runq_log_s {
> >         char comm[16];
> >         int  pid;
> > } runq_log[1024*1024];
> >
> > and the kernel didn't boot. Yes, I understand it is 20M of bss - so what?

Is it impossible to allocate this array dynamically? I am not sure if we
have
to change too many things in startup code. If yes, we must have good
enough
arguments for Linus.

> Look at the code in arch/i386/kernel/entry.S that initializes our temporary
> page tables:

Actually this code is from arch/i386/kernel/head.S ;-) 

 
> /*
>  * Initialize page tables
>  */
>         movl $pg0-__PAGE_OFFSET,%edi /* initialize page tables */
>         movl $007,%eax          /* "007" doesn't mean with right to kill, but
>                                    PRESENT+RW+USER */
> 2:      stosl
>         add $0x1000,%eax
>         cmp $empty_zero_page-__PAGE_OFFSET,%edi
>         jne 2b

Actually when/where exactly mm init takes place should be checked first.

best,
Petkan