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

From: David Rientjes
Date: Mon Feb 03 2014 - 21:01:09 EST

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
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