linux-kernel - Re: All pages belonging to a process

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Message-ID: <alpine.LRH.2.00.0908251443230.11692@twin.jikos.cz>
Date:	Tue, 25 Aug 2009 14:44:22 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Anupama Chandwani <anupama.chandwani@...il.com>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: All pages belonging to a process

On Tue, 25 Aug 2009, Anupama Chandwani wrote:

>       /* For all vma-s of a process */
>       for (vma = task->mm->mmap; vma!=NULL; vma = vma->next)

you mean vma->vm_next?

>       {
>                pgd = pgd_offset(mm, address);
>                if (!pgd_present(*pgd))
>                     continue;
> 
>                pud = pud_offset(pgd, address);
>                if (!pud_present(*pud))
>                     continue;
> 
>                pmd = pmd_offset(pud, address);
>                if (!pmd_present(*pmd))
>                     continue;
> 
>               pte = pte_offset_map_lock (task->mm->vm_mm, pmd, address, &ptl);
> 
>               print pte_pfn(*pte) and other debug info;
> 
>               pte_unmap_unlock(pte, ptl);
>       }
> }
> 
> The code hangs. I do not get anything in dmesg.

Do you have mmap_sem locked?

-- 
Jiri Kosina
SUSE Labs