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Date: Tue, 8 Apr 2014 09:23:00 +0100 From: Mel Gorman <mgorman@...e.de> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Robert Haas <robertmhaas@...il.com>, Josh Berkus <josh@...iodbs.com>, Andres Freund <andres@...quadrant.com>, Christoph Lameter <cl@...ux.com>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de> Subject: [PATCH 2/2] mm: page_alloc: Do not cache reclaim distances pgdat->reclaim_nodes tracks if a remote node is allowed to be reclaimed by zone_reclaim due to its distance. As it is expected that zone_reclaim_mode will be rarely enabled it is unreasonable for all machines to take a penalty. Fortunately, the zone_reclaim_mode() path is already slow and it is the path that takes the hit. Signed-off-by: Mel Gorman <mgorman@...e.de> Acked-by: Johannes Weiner <hannes@...xchg.org> Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com> --- include/linux/mmzone.h | 1 - mm/page_alloc.c | 15 +-------------- 2 files changed, 1 insertion(+), 15 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 9b61b9b..564b169 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -757,7 +757,6 @@ typedef struct pglist_data { unsigned long node_spanned_pages; /* total size of physical page range, including holes */ int node_id; - nodemask_t reclaim_nodes; /* Nodes allowed to reclaim from */ wait_queue_head_t kswapd_wait; wait_queue_head_t pfmemalloc_wait; struct task_struct *kswapd; /* Protected by lock_memory_hotplug() */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a256f85..574928e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1863,16 +1863,7 @@ static bool zone_local(struct zone *local_zone, struct zone *zone) static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) { - return node_isset(local_zone->node, zone->zone_pgdat->reclaim_nodes); -} - -static void __paginginit init_zone_allows_reclaim(int nid) -{ - int i; - - for_each_online_node(i) - if (node_distance(nid, i) <= RECLAIM_DISTANCE) - node_set(i, NODE_DATA(nid)->reclaim_nodes); + return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) < RECLAIM_DISTANCE; } #else /* CONFIG_NUMA */ @@ -1906,9 +1897,6 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) return true; } -static inline void init_zone_allows_reclaim(int nid) -{ -} #endif /* CONFIG_NUMA */ /* @@ -4917,7 +4905,6 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, pgdat->node_id = nid; pgdat->node_start_pfn = node_start_pfn; - init_zone_allows_reclaim(nid); #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); #endif -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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