linux-kernel - Re: [PATCH 2/3] compaction: compact unevictable page

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Message-ID: <20110831111954.GB17512@redhat.com>
Date:	Wed, 31 Aug 2011 13:19:54 +0200
From:	Johannes Weiner <jweiner@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/3] compaction: compact unevictable page

On Sun, Nov 13, 2011 at 01:37:42AM +0900, Minchan Kim wrote:
> Now compaction doesn't handle mlocked page as it uses __isolate_lru_page
> which doesn't consider unevicatable page. It has been used by just lumpy so
> it was pointless that it isolates unevictable page. But the situation is
> changed. Compaction could handle unevictable page and it can help getting
> big contiguos pages in fragment memory by many pinned page with mlock.

This may result in applications unexpectedly faulting and waiting on
mlocked pages under migration.  I wonder how realtime people feel
about that?
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