Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 3/4] mm: page_alloc: Use zone node IDs to approximate locality | Date | Thu, 12 Dec 2013 15:06:18 +0000 |
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zone_local is using node_distance which is a more expensive call than necessary. On x86, it's another function call in the allocator fast path and increases cache footprint. This patch makes the assumption zones on a local node will share the same node ID. The necessary information should already be cache hot.
Signed-off-by: Mel Gorman <mgorman@suse.de> --- mm/page_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 64020eb..fd9677e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1816,7 +1816,7 @@ static void zlc_clear_zones_full(struct zonelist *zonelist) static bool zone_local(struct zone *local_zone, struct zone *zone) { - return node_distance(local_zone->node, zone->node) == LOCAL_DISTANCE; + return zone_to_nid(zone) == numa_node_id(); } static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) -- 1.8.4
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