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SubjectRe: is there a limit on bss size?
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
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