ac->classzone_idx is determined by the index of the preferred zone and cached to avoid repeated calculations. wake_all_kswapds() should use it instead of using zone_idx() within a loop. Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> --- 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 4d4079309760..e551f697bc68 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3139,7 +3139,7 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx, ac->nodemask) - wakeup_kswapd(zone, order, zonelist_zone_idx(ac->preferred_zoneref)); + wakeup_kswapd(zone, order, ac->classzone_idx); } static inline unsigned int -- 2.6.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>