mm, vmscan: have kswapd only scan based on the highest requested zone
kswapd checks all eligible zones to see if they need balancing even if it was woken for a lower zone. This made sense when we reclaimed on a per-zone basis because we wanted to shrink zones fairly so avoid age-inversion problems. Ideally this is completely unnecessary when reclaiming on a per-node basis. In theory, there may still be anomalies when all requests are for lower zones and very old pages are preserved in higher zones but this should be the exceptional case. Link: http://lkml.kernel.org/r/1467970510-21195-7-git-send-email-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@surriel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -3209,11 +3209,8 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
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sc.nr_reclaimed = 0;
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/*
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* Scan in the highmem->dma direction for the highest
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* zone which needs scanning
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*/
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for (i = pgdat->nr_zones - 1; i >= 0; i--) {
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/* Scan from the highest requested zone to dma */
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for (i = classzone_idx; i >= 0; i--) {
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struct zone *zone = pgdat->node_zones + i;
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if (!populated_zone(zone))
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