From: Christoph Hellwig <hch@infradead.org>
To: Timur Tabi <timur.tabi@ammasso.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernelnewbies@nl.linux.org
Subject: Re: get_user_pages() still broken in 2.6
Date: Wed, 29 Sep 2004 16:01:34 +0100 [thread overview]
Message-ID: <20040929160134.A13683@infradead.org> (raw)
In-Reply-To: <415ACB29.5000104@ammasso.com>; from timur.tabi@ammasso.com on Wed, Sep 29, 2004 at 09:48:09AM -0500
On Wed, Sep 29, 2004 at 09:48:09AM -0500, Timur Tabi wrote:
> Christoph Hellwig wrote:
>
> > get_user_pages locks the page in memory. It doesn't do anything about ptes.
>
> I don't understand the difference. I thought a locked page is one that
> stays in memory (i.e. isn't swapped out) and whose physical address
> never changes. Is that wrong?
Yes. But if you're walking ptes you're looking at virtual addresses
somehow. Can you send me a pointer to your code please? I suspect
it's doing something terribly stupid.
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next prev parent reply other threads:[~2004-09-29 15:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-28 22:40 Timur Tabi
2004-09-28 23:03 ` Christoph Hellwig
2004-09-28 23:21 ` Dave Hansen
2004-09-29 14:46 ` Timur Tabi
2004-09-29 14:48 ` Timur Tabi
2004-09-29 15:01 ` Christoph Hellwig [this message]
2004-09-29 4:49 ` opening a file inside the kernel module Rakesh Jagota
2004-09-29 5:00 ` Jeff Garzik
2004-09-29 5:56 ` Rakesh Jagota
2004-09-29 15:52 ` Stuart MacDonald, linux-kernel-owner
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