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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
