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Date: Sat, 16 Jul 2016 00:53:02 +0900
From: Minchan Kim <minchan@kernel.org>
To: Mel Gorman <mgorman@techsingularity.net>
CC: Andrew Morton <akpm@linux-foundation.org>,
        Johannes Weiner <hannes@cmpxchg.org>, Vlastimil Babka <vbabka@suse.cz>,
        Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/5] mm, pagevec: Release/reacquire lru_lock on pgdat
 change
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On Fri, Jul 15, 2016 at 02:09:23PM +0100, Mel Gorman wrote:
> With node-lru, the locking is based on the pgdat. Previously it was
> required that a pagevec drain released one zone lru_lock and acquired
> another zone lru_lock on every zone change. Now, it's only necessary if
> the node changes. The end-result is fewer lock release/acquires if the
> pages are all on the same node but in different zones.
> 
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Minchan Kim <minchan@kernel.org>

check_move_unevictable_pages could be a candidate, too.