linux-kernel - Re: Classifying user and kernel pages

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Message-ID: <CAFqkpAYxeDoZwpBfgkNtTvPJQ4J7CEamvnZX6icXY1N8ALU3-w@mail.gmail.com>
Date:	Mon, 21 Oct 2013 05:11:16 +0530
From:	Piyus Kedia <piyuskedia@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Classifying user and kernel pages

The user pages are generally allocated using GFP_USER or GFP_HIGHMEM
flags. The linux kernel treats GFP_USER and GFP_KERNEL as same. So,
there is no way you can tell whether a physical page belongs to user
process or not using physical frame number.

Piyus

On Fri, Oct 4, 2013 at 12:19 AM, Piyus Kedia <piyuskedia@...il.com> wrote:
> Hi All,
>
> Does anybody know if there is a way in Linux Kernel to find whether a
> physical page is a user page or it is kernel page. A kernel page is
> only accessed by kernel and it doesn't belong to any user process.
>
> Thanks,
> Piyus
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