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Date: Fri, 13 Mar 2015 21:02:08 +0100
From: Michal Hocko <mhocko@suse.cz>
To: Eric B Munson <emunson@akamai.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Vlastimil Babka <vbabka@suse.cz>, Thomas Gleixner <tglx@linutronix.de>,
        Christoph Lameter <cl@linux.com>,
        Peter Zijlstra <peterz@infradead.org>, Mel Gorman <mgorman@suse.de>,
        David Rientjes <rientjes@google.com>, Rik van Riel <riel@redhat.com>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V5] Allow compaction of unevictable pages
Message-ID: <20150313200208.GA28848@dhcp22.suse.cz>
References: <1426267597-25811-1-git-send-email-emunson@akamai.com>
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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