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 17:57:28 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0602271755070.14367@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20060227175324.229860ca.akpm@osdl.org>
On Mon, 27 Feb 2006, Andrew Morton wrote:
> Are we sure this is race-free? Say, someone is in the process of cleaning
> the page? munmap, conceivably swapout? We end up with a dirty pte
> pointing at a now-clean page. The page will later become dirty again. Is
> that a problem? It would generate a surprise if the vma had ben set
> read-only in the interim, for example.
munmap sets the dirty bit in pages rather than clearing the dirty bits.
If we would set a dirty bit in a pte pointing to a now clean page then
unmapping (or the swaper) will mark the page dirty again and its going to
be rewritten again.
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next prev parent reply other threads:[~2006-02-28 1:57 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 [this message]
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
2006-02-28 14:05 ` Hugh Dickins
2006-02-28 16:06 ` Christoph Lameter
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