From: Robin Holt <holt@sgi.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linux Memory Management <linux-mm@kvack.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: VM_RESERVED vs vm_normal_page()
Date: Wed, 13 Dec 2006 07:20:48 -0600 [thread overview]
Message-ID: <20061213132048.GB30950@lnx-holt.americas.sgi.com> (raw)
In-Reply-To: <1165984677.11914.159.camel@localhost.localdomain>
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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prev parent reply other threads:[~2006-12-13 13:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-13 4:37 Benjamin Herrenschmidt
2006-12-13 13:20 ` Robin Holt [this message]
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