[PATCH 01/27] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone)

Mel Gorman
2016-02-23T15:04:54Z

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@techsingularity.net>
---
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 c849a202b6f1..46ecbfa5b228 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3022,7 +3022,7 @@ 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, zone_idx(ac->preferred_zone));
+ wakeup_kswapd(zone, order, ac->classzone_idx);
}

static inline int
--
2.6.4