Re: [PATCH 22/34] mm, page_alloc: wake kswapd based on the highest eligible zone

From	Johannes Weiner <hannes@cmpxchg.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 22/34] mm, page_alloc: wake kswapd based on the highest eligible zone
Date	2016-07-12 19:30 +0200
Message-ID	<rU9Fn-80P-17@gated-at.bofh.it> (permalink)
References	<rSAqm-2Tv-3@gated-at.bofh.it> <rSAA2-2Xn-29@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Jul 08, 2016 at 10:34:58AM +0100, Mel Gorman wrote:
> The ac_classzone_idx is used as the basis for waking kswapd and that is based
> on the preferred zoneref. If the preferred zoneref's first zone is lower
> than what is available on other nodes, it's possible that kswapd is woken
> on a zone with only higher, but still eligible, zones. As classzone_idx
> is strictly adhered to now, it causes a problem because eligible pages
> are skipped.
> 
> For example, node 0 has only DMA32 and node 1 has only NORMAL. An allocating
> context running on node 0 may wake kswapd on node 1 telling it to skip
> all NORMAL pages.
> 
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>

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

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Re: [PATCH 22/34] mm, page_alloc: wake kswapd based on the highest  eligible zone Johannes Weiner <hannes@cmpxchg.org> - 2016-07-12 19:30 +0200

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