From: Christoph Lameter <clameter@engr.sgi.com>
To: Andrew Morton <akpm@osdl.org>
Cc: hugh@veritas.com, linux-mm@kvack.org
Subject: Re: unuse_pte: set pte dirty if the page is dirty
Date: Mon, 27 Feb 2006 21:32:12 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0602272117180.15738@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20060227203923.24e9336c.akpm@osdl.org>
On Mon, 27 Feb 2006, Andrew Morton wrote:
> argh. Whenever you find yourself thinking of the question-mark operator,
> take a cold shower.
Hehe.... Yes I love it...
> This?
Okay lets continue the work based on that...
> I think it has the same race - if the page gets cleaned and someone
> mprotects the vma to remove VM_WRITE, we dirty an undirtiable page.
unuse_pte is used:
1. To switch off a swap device.
2. To reestablish ptes for a migrated anonymous page.
In both cases we are only dealing with anonymous pages. The only writer
can be the swap code and as far as I can tell the only risk is writing a
swap page out once again. That is if it would be cleaned by pageout().
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next prev parent reply other threads:[~2006-02-28 5:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-28 1:33 Christoph Lameter
2006-02-28 1:53 ` Andrew Morton
2006-02-28 1:57 ` Christoph Lameter
2006-02-28 2:21 ` Andrew Morton
2006-02-28 4:20 ` Christoph Lameter
2006-02-28 4:39 ` Andrew Morton
2006-02-28 5:32 ` Christoph Lameter [this message]
2006-02-28 14:05 ` Hugh Dickins
2006-02-28 16:06 ` Christoph Lameter
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