linux-kernel - Re: Question on Memory management unit

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Message-ID: <CALZVapn=9j7=53Zktg_udaCPaKbmxVNJWGRjdt--pEJjS8bKzg@mail.gmail.com>
Date:	Mon, 10 Dec 2012 16:01:59 +0100
From:	Javier Domingo <javierdo1@...il.com>
To:	Sri Ram Vemulpali <sri.ram.gmu06@...il.com>
Cc:	linux-newbie@...r.kernel.org,
	linux-kernel-mail <linux-kernel@...r.kernel.org>
Subject: Re: Question on Memory management unit

I will just refer you to this link:

http://stackoverflow.com/questions/116343/what-is-the-difference-between-vmalloc-and-kmalloc

Is as much as I know about that. You will find links that refer to
other places, where they discuss/explain that.

Javier Domingo


2012/12/9 Sri Ram Vemulpali <sri.ram.gmu06@...il.com>:
> Hi Guys,
>
> I have question on memory management in linux kernel.
>
> From my understanding memory is divided into 3GB and 1GB for 32-bit
> architectures. 1GB is allocated to kernel space and 3GB is allocated
> to user space.
>
> To access any memory in kernel space, it should be mapped in to kernel
> virtual address space.
>
> My question is how do we know kernel address space (virtual address).
> Can we recognize a range of addresses, if so what is that range of
> kernel virtual address?
>
> What function returns kernel virtual address. Or do we need to map to
> get kernel virtual address.
>
> I know kmalloc returns logical address and vmalloc returns virtual address.
> And all these addresses should go through MMU to access physical
> memory. So there will be page mappings in kernel for these addresses.
> Is this true?
>
> Thanks in advance.
> --
> Regards,
> Sri.
> --
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