From c9ab0c4fbeb0202bac3548378a977e1536ebe3ca Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@techsingularity.net>
Date: Fri, 6 Nov 2015 16:28:12 -0800
Subject: mm, page_alloc: remove unnecessary recalculations for dirty zone
 balancing

File-backed pages that will be immediately written are balanced between
zones.  This heuristic tries to avoid having a single zone filled with
recently dirtied pages but the checks are unnecessarily expensive.  Move
consider_zone_balanced into the alloc_context instead of checking bitmaps
multiple times.  The patch also gives the parameter a more meaningful
name.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/internal.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'mm/internal.h')

diff --git a/mm/internal.h b/mm/internal.h
index d4b807d6c963..ff0f1ada0f67 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -129,6 +129,7 @@ struct alloc_context {
 	int classzone_idx;
 	int migratetype;
 	enum zone_type high_zoneidx;
+	bool spread_dirty_pages;
 };
 
 /*
-- 
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