linux-kernel - Re: How much kernel memory is in 64-bit OS ?

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Message-ID: <b681c62b0609180251m79071e59oe212b1133bf6944c@mail.gmail.com>
Date:	Mon, 18 Sep 2006 15:21:57 +0530
From:	"yogeshwar sonawane" <yogyas@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: How much kernel memory is in 64-bit OS ?

On 9/16/06, yogeshwar sonawane <yogyas@...il.com> wrote:
> Hi all,
>
> We all know that in 32-bit OS, total 4GB memory space is divided in
> 3(user) + 1(kernel) space.
>
> Similarly, what is the division/scenario in case of 64-bit OS ?
>
> Any reference/explanation will be helpful.
>
> thanks in advance.
>
>
> Yogeshwar
>

On similar lines, some time back, i read that, to accomodate large
physical memory ,
the 3G/1G layout is modified to have 4G/4G partition. But if somebody
can focus the light on following things, it will be helpful.
1) what was the requirement of 4G/4G layout ?
2) how it is managed ?
3) how HIGH_MEMORY concept is related here.

Thanks in advance,
Yogeshwar
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