I figured out where is the problem.
It is a function I implemented for kernel 2.6.1, but
does not work for 2.6.9. The function below throws the
segmentation fault.
Here is the function:
void resident_mem_size(struct mm_struct *mm, unsigned
long start_address, unsigned long end_address,
unsigned long *size) {
pgd_t *my_pgd;
pmd_t *my_pmd;
pte_t *my_pte;
unsigned long page;
for (page = start_address; page < end_address; page
+= PAGE_SIZE) {
my_pgd = pgd_offset(mm, page);
if (pgd_none(*my_pgd) || pgd_bad(*my_pgd)) continue;
my_pmd = pmd_offset(my_pgd, page);
if (pmd_none(*my_pmd) || pmd_bad(*my_pmd)) continue;
my_pte = pte_offset_map(my_pmd, page);
if (pte_present(*my_pte)) {
*size += PAGE_SIZE;
}
}
}
Does anyone know what is going on?
Mauricio Lin.
--- Mauricio Lin <mauriciolin2000@xxxxxxxxxxxx>
escreveu:
> Hi All,
>
> I have implemented a new entry in proc directory in
> kernel 2.6.1. It is something similar to
> /proc/pid/maps. The new entry is /proc/pid/smaps
> where
> pid is the process id. It is working well on kernel
> 2.6.1.
>
> I decided to upgrade it to kernel 2.6.9, but
> something
> is going wrong when I type de cat command.
>
> $ cat /proc/3477/smaps
>
> b68ed000-b68ee000 rw-p /usr/lib/kde3/kded_kinetd.so
> VmRss: 4 kB
> VmData: 0 KB
> VmStk: 0 kB
> VmExe: 0 kB
> VmLib: 0 kB
> Shared: 0 kB
> Private: 4 kB
> Shareable: 0 kB
> b68ee000-b68ff000 r--p
>
/usr/share/fonts/truetype/ttf-bitstream-vera/Vera.ttf
> VmRss: 68 kB
> VmData: 0 KB
> VmStk: 0 kB
> VmExe: 0 kB
> VmLib: 0 kB
> Shared: 0 kB
> Private: 68 kB
> Shareable: 0 kB
>
> ....
>
> b7fea000-b8000000 r-xp /lib/ld-2.3.2.so
> VmRss: 80 kB
> VmData: 0 KB
> VmStk: 0 kB
> VmExe: Segmentation fault
>
> As you can see, the segmentation fault is displayed
> at
> the end of the output. This problem does not have
> for
> kernel 2.6.1.
>
> The files I changed are fs/proc/base.c and
> fs/proc/task_mmu.c on kernel 2.6.1. AFAIK this files
> were not changed since 2.6.1. So what is going on
> with
> kernel 2.6.9?
>
> BR,
>
> Mauricio Lin.
>
> =====
> ************************************************
> Conhecimento vem do seu instrutor;
> Sabedoria vem do seu interior.
> (Bruce Lee)
> ************************************************
>
>
>
>
>
>
_______________________________________________________
>
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>
> --
> Kernelnewbies: Help each other learn about the Linux
> kernel.
> Archive:
> http://mail.nl.linux.org/kernelnewbies/
> FAQ: http://kernelnewbies.org/faq/
>
>
=====
************************************************
Conhecimento vem do seu instrutor;
Sabedoria vem do seu interior.
(Bruce Lee)
************************************************
_______________________________________________________
Yahoo! Acesso Grátis - Internet rápida e grátis. Instale o discador agora! http://br.acesso.yahoo.com/
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Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
