linux-kernel - Re: [patch] mm, compaction: avoid isolating pinned pages fix

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Message-ID: <alpine.DEB.2.02.1402031755440.26347@chino.kir.corp.google.com>
Date:	Mon, 3 Feb 2014 18:00:56 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch] mm, compaction: avoid isolating pinned pages fix

On Tue, 4 Feb 2014, Joonsoo Kim wrote:

> Okay. It can't fix your situation. Anyway, *normal* anon pages may be mapped
> and have positive page_count(), so your code such as
> '!page_mapping(page) && page_count(page)' makes compaction skip these *normal*
> anon pages and this is incorrect behaviour.
> 

So how does that work with migrate_page_move_mapping() which demands 
page_count(page) == 1 and the get_page_unless_zero() in 
__isolate_lru_page()?
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