linux-kernel - [PATCH 21/25] mm, page_alloc: Defer zlc_setup until it is known it is required

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Message-Id: <1433771791-30567-22-git-send-email-mgorman@suse.de>
Date:	Mon,  8 Jun 2015 14:56:27 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Linux-MM <linux-mm@...ck.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 21/25] mm, page_alloc: Defer zlc_setup until it is known it is required

The zonelist cache (zlc) records if zone_reclaim() is necessary but it is
setup before it is checked if zone_reclaim is even enabled.  This patch
defers the setup until after zone_reclaim is checked.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/page_alloc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6b3a78420a5e..637b293cd5d1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2076,6 +2076,10 @@ zonelist_scan:
 			if (alloc_flags & ALLOC_NO_WATERMARKS)
 				goto try_this_zone;
 
+			if (zone_reclaim_mode == 0 ||
+			    !zone_allows_reclaim(ac->preferred_zone, zone))
+				goto this_zone_full;
+
 			if (IS_ENABLED(CONFIG_NUMA) &&
 					!did_zlc_setup && nr_online_nodes > 1) {
 				/*
@@ -2088,10 +2092,6 @@ zonelist_scan:
 				did_zlc_setup = 1;
 			}
 
-			if (zone_reclaim_mode == 0 ||
-			    !zone_allows_reclaim(ac->preferred_zone, zone))
-				goto this_zone_full;
-
 			/*
 			 * As we may have just activated ZLC, check if the first
 			 * eligible zone has failed zone_reclaim recently.
-- 
2.3.5

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