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Date: Thu, 26 Jul 2001 07:38:00 -0300 (BRT)
From: Marcelo Tosatti <marcelo@conectiva.com.br>
To: Daniel Phillips <phillips@bonn-fries.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Rik van Riel <riel@conectiva.com.br>, Andrew Morton <akpm@zip.com.au>,
        linux-kernel@vger.kernel.org, Ben LaHaise <bcrl@redhat.com>,
        Mike Galbraith <mikeg@wen-online.de>
Subject: Re: [RFC] Optimization for use-once pages
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On Thu, 26 Jul 2001, Daniel Phillips wrote:

> There does seem to be a dangling thread here though - when a process 
> page is unmapped and added to swap cache in try_to_swap_out then later 
> faulted back in, I don't see where we "rescue" the page from the 
> inactive queue.  Maybe I'm just not looking hard enough.

do_swap_page()->lookup_swap_cache()->__find_page_nolock()->SetPageReferenced().

The referenced bit will make page_launder/reclaim_page move the page to
the active list.



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