linux-kernel - Re: [PATCH V5] Allow compaction of unevictable pages

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Message-ID: <20150313200208.GA28848@dhcp22.suse.cz>
Date:	Fri, 13 Mar 2015 21:02:08 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Eric B Munson <emunson@...mai.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <cl@...ux.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5] Allow compaction of unevictable pages

On Fri 13-03-15 13:26:37, Eric B Munson wrote:
[...]
> +compact_unevictable
> +
> +Available only when CONFIG_COMPACTION is set. When set to 1, compaction is
> +allowed to examine the unevictable lru (mlocked pages) for pages to compact.
> +This should be used on systems where stalls for minor page faults are an
> +acceptable trade for large contiguous free memory.  Set to 0 to prevent
> +compaction from moving pages that are unevictable.

It is not clear which behavior is default from this text.
-- 
Michal Hocko
SUSE Labs
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