linux-kernel - Re: [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone

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Message-ID: <23a86eb7-ffa2-4269-3acb-47b29d984a3c@suse.cz>
Date:	Wed, 22 Jun 2016 18:08:54 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Mel Gorman <mgorman@...hsingularity.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>
Cc:	Rik van Riel <riel@...riel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for
 the requested classzone

On 06/21/2016 04:16 PM, 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@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>