linux-kernel - Re: VM_RESERVED vs vm_normal

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Message-ID: <20061213132048.GB30950@lnx-holt.americas.sgi.com>
Date:	Wed, 13 Dec 2006 07:20:48 -0600
From:	Robin Holt <holt@....com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linux Memory Management <linux-mm@...ck.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: VM_RESERVED vs vm_normal_page()

On Wed, Dec 13, 2006 at 03:37:57PM +1100, Benjamin Herrenschmidt wrote:
> Hi folks !
> 
> What is the logic regarding VM_RESERVED, and more specifically, why is
> vm_normal_page() nor returning NULL for these ?

Near as I could ever tell from the discussion on linux-mm, it is a page
which should not be dumped.  If you have a normal page in a mapping
which you don't want swapped out, the only way I could ever figure to
prevent that from happening is by doing an extra get_user_page() on it
to add a reference.

Thanks,
Robin
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