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Date: Tue, 12 Jul 2016 13:18:45 -0400
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 21/34] mm, vmscan: only wakeup kswapd once per node for
 the requested classzone
Message-ID: <20160712171845.GA7307@cmpxchg.org>
References: <1467970510-21195-1-git-send-email-mgorman@techsingularity.net>
 <1467970510-21195-22-git-send-email-mgorman@techsingularity.net>
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In-Reply-To: <1467970510-21195-22-git-send-email-mgorman@techsingularity.net>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>, Minchan Kim <minchan@kernel.org>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, LKML <linux-kernel@vger.kernel.org>

On Fri, Jul 08, 2016 at 10:34:57AM +0100, Mel Gorman wrote:
> kswapd is woken when zones are below the low watermark but the wakeup
> decision is not taking the classzone into account.  Now that reclaim is
> node-based, it is only required to wake kswapd once per node and only if
> all zones are unbalanced for the requested classzone.
> 
> Note that one node might be checked multiple times if the zonelist is
> ordered by node because there is no cheap way of tracking what nodes have
> already been visited.  For zone-ordering, each node should be checked only
> once.
> 
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

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