linux-kernel - [PATCH 01/28] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred

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Message-Id: <1460456783-30996-2-git-send-email-mgorman@techsingularity.net>
Date:	Tue, 12 Apr 2016 11:25:56 +0100
From:	Mel Gorman <mgorman@...hsingularity.net>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>
Cc:	Rik van Riel <riel@...riel.com>, Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 01/28] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone)

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@...hsingularity.net>
Acked-by: Johannes Weiner <hannes@...xchg.org>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
---
 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