Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is any eligible zone

From	Mel Gorman <mgorman@techsingularity.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is any eligible zone
Date	2016-07-07 13:00 +0200
Message-ID	<rSfce-5Oc-11@gated-at.bofh.it> (permalink)
References	(2 earlier) <rRrS9-7vt-3@gated-at.bofh.it> <rRvVL-1Aj-11@gated-at.bofh.it> <rRJP4-2sv-5@gated-at.bofh.it> <rRQGS-6SL-17@gated-at.bofh.it> <rSaYV-3ar-9@gated-at.bofh.it>
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On Thu, Jul 07, 2016 at 03:27:01PM +0900, Minchan Kim wrote:
> > I'm not going to go with it for now because buffer_heads_over_limit is not
> > necessarily a problem unless lowmem is factor. We don't want background
> > reclaim to go ahead unnecessarily just because buffer_heads_over_limit.
> > It could be distinguished by only forcing reclaim to go ahead on systems
> > with highmem.
> 
> If you don't think it's a problem, I don't want to insist on it because I don't
> have any report/workload right now. Instead, please write some comment in there
> for others to understand why kswapd is okay to ignore buffer_heads_over_limit
> unlike direct reclaim. Such non-symmetric behavior is really hard to follow
> without any description.

Ok, I'll add a patch later in the series that addresses the issue.
Currently it's called "mm, vmscan: Have kswapd reclaim from all zones if
reclaiming and buffer_heads_over_limit".

-- 
Mel Gorman
SUSE Labs

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[PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is any eligible zone Mel Gorman <mgorman@techsingularity.net> - 2016-07-01 22:10 +0200
  Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is  any eligible zone Minchan Kim <minchan@kernel.org> - 2016-07-05 08:20 +0200
    Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is  any eligible zone Mel Gorman <mgorman@techsingularity.net> - 2016-07-05 12:40 +0200
      Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is  any eligible zone Minchan Kim <minchan@kernel.org> - 2016-07-06 03:30 +0200
        Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is  any eligible zone Mel Gorman <mgorman@techsingularity.net> - 2016-07-06 10:50 +0200
          Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is  any eligible zone Minchan Kim <minchan@kernel.org> - 2016-07-07 08:30 +0200
            Re: [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is  any eligible zone Mel Gorman <mgorman@techsingularity.net> - 2016-07-07 13:00 +0200

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