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Date: Fri, 1 Jul 2016 21:01:18 +0100 From: Mel Gorman <mgorman@...hsingularity.net> To: Andrew Morton <akpm@...ux-foundation.org>, Linux-MM <linux-mm@...ck.org> Cc: Rik van Riel <riel@...riel.com>, Vlastimil Babka <vbabka@...e.cz>, Johannes Weiner <hannes@...xchg.org>, LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...hsingularity.net> Subject: [PATCH 10/31] mm, vmscan: remove duplicate logic clearing node congestion and dirty state Reclaim may stall if there is too much dirty or congested data on a node. This was previously based on zone flags and the logic for clearing the flags is in two places. As congestion/dirty tracking is now tracked on a per-node basis, we can remove some duplicate logic. Signed-off-by: Mel Gorman <mgorman@...hsingularity.net> --- mm/vmscan.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 34656173a670..911142d25de2 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3005,7 +3005,17 @@ static bool zone_balanced(struct zone *zone, int order, int classzone_idx) { unsigned long mark = high_wmark_pages(zone); - return zone_watermark_ok_safe(zone, order, mark, classzone_idx); + if (!zone_watermark_ok_safe(zone, order, mark, classzone_idx)) + return false; + + /* + * If any eligible zone is balanced then the node is not considered + * to be congested or dirty + */ + clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags); + clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags); + + return true; } /* @@ -3151,13 +3161,6 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) if (!zone_balanced(zone, order, 0)) { classzone_idx = i; break; - } else { - /* - * If any eligible zone is balanced then the - * node is not considered congested or dirty. - */ - clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags); - clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags); } } @@ -3216,11 +3219,8 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) if (!populated_zone(zone)) continue; - if (zone_balanced(zone, sc.order, classzone_idx)) { - clear_bit(PGDAT_CONGESTED, &pgdat->flags); - clear_bit(PGDAT_DIRTY, &pgdat->flags); + if (zone_balanced(zone, sc.order, classzone_idx)) goto out; - } } /* -- 2.6.4
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