[PATCH 06/17] mm: page_alloc: Only check the alloc flags and gfp_mask for dirty once

[Mel Gorman]

Currently it's calculated once per zone in the zonelist.

Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 mm/page_alloc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8971953..2e576fd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1925,6 +1925,8 @@ get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
 	nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */
 	int zlc_active = 0;		/* set if using zonelist_cache */
 	int did_zlc_setup = 0;		/* just call zlc_setup() one time */
+	bool consider_zone_dirty = (alloc_flags & ALLOC_WMARK_LOW) &&
+				(gfp_mask & __GFP_WRITE);
 
 zonelist_scan:
 	/*
@@ -1983,8 +1985,7 @@ zonelist_scan:
 		 * will require awareness of zones in the
 		 * dirty-throttling and the flusher threads.
 		 */
-		if ((alloc_flags & ALLOC_WMARK_LOW) &&
-		    (gfp_mask & __GFP_WRITE) && !zone_dirty_ok(zone))
+		if (consider_zone_dirty && !zone_dirty_ok(zone))
 			continue;
 
 		mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
-- 
1.8.4.5

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