linux-kernel - [PATCH 1/4] mm: page_alloc: determine migratetype only once

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Date:	Wed,  6 Aug 2014 15:55:53 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH 1/4] mm: page_alloc: determine migratetype only once

The check for ALLOC_CMA in __alloc_pages_nodemask() derives migratetype
from gfp_mask in each retry pass, although the migratetype variable already
has the value determined and it does not change. Use the variable and perform
the check only once. Also convert #ifdef CONFIC_CMA to IS_ENABLED.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/page_alloc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d0e3d2f..b2cd463 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2775,6 +2775,9 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
 	if (unlikely(!zonelist->_zonerefs->zone))
 		return NULL;
 
+	if (IS_ENABLED(CONFIG_CMA) && migratetype == MIGRATE_MOVABLE)
+		alloc_flags |= ALLOC_CMA;
+
 retry_cpuset:
 	cpuset_mems_cookie = read_mems_allowed_begin();
 
@@ -2786,10 +2789,6 @@ retry_cpuset:
 		goto out;
 	classzone_idx = zonelist_zone_idx(preferred_zoneref);
 
-#ifdef CONFIG_CMA
-	if (allocflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
-		alloc_flags |= ALLOC_CMA;
-#endif
 	/* First allocation attempt */
 	page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
 			zonelist, high_zoneidx, alloc_flags,
-- 
1.8.4.5

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