From: Mel Gorman <mel@csn.ul.ie>
To: "Raghu R. Arur" <rra2002@aria.ncl.cs.columbia.edu>
Cc: kernelnewbies@nl.linux.org, linux-mm@kvack.org
Subject: Re: removing clean mapped pages
Date: Wed, 13 Aug 2003 15:07:31 +0100 (IST) [thread overview]
Message-ID: <Pine.LNX.4.53.0308131504470.12612@skynet> (raw)
In-Reply-To: <Pine.LNX.4.53.0308131143440.4904@skynet>
On Wed, 13 Aug 2003, Mel Gorman wrote:
> Freed in try_to_swap_out() . There is no need to do anything with a clean
> page, so it is just dropped from the page tables and page_cache_release()
> is called. When the reference reaches 0, the page is reclaimed
>
Bah, this is wrong, shouldn't be let near e-mail in the morning. The
freeing of a file-mapped page is actually two-stage.
try_to_swap_out() will unmap the file-backed page from a process page
table. Once there are no processes mapping the page, the only user in
page->count will be the page cache. It stays in the page cache until it is
reclaimed later by shrink_cache().
--
Mel Gorman
http://www.csn.ul.ie/~mel
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prev parent reply other threads:[~2003-08-13 14:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-12 19:31 Raghu R. Arur
2003-08-12 19:42 ` Raghu R. Arur
2003-08-13 10:46 ` Mel Gorman
2003-08-13 14:07 ` Mel Gorman [this message]
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