----- Original Message -----
From: 李一
To: Mulyadi Santosa
Cc: [email protected]
Sent: Tuesday, October 16, 2007 2:00 PM
Subject: Re: process page tables
On 10/16/07, Mulyadi Santosa <[EMAIL PROTECTED]> wrote:
Hi...
> I am new to Linux MM. Can someone answer my following questions?
>
I'll try...
> 1> Where is the process page table(mm->pgd) stored? Is it stored below
> PAGE_OFFSET ?
not true. when forking a new process, several pages include pgd will be
allocated from kernel cache in kernel space.then above PAGE_OFFSET.
Above PAGE_OFFSET, in other word... it's inside kernel space, just like
the task_struct descriptor.
sure
> If yes, then wouldn't there
> be a chance of the page tables getting accidentally corrupted by the user
> process as it is in the user address space?
>
yes these pages should not be movable(swapped out).
> 2> What will happen if the page containing the process page
table(mm->pgd)
> is swapped on the disk and the process is scheduled for execution ?
>
Since it's in kernel space, it won't be swapped out.
sure
Why wouldn't things in kernel space be swapped out? Dosen't make sense...
regards,
Mulyadi
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