linux-kernel - [PATCH v3] mm/compaction: __compact

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Message-Id: <1449115845-19409-1-git-send-email-iamjoonsoo.kim@lge.com>
Date:	Thu,  3 Dec 2015 13:10:45 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Yaowei Bai <baiyaowei@...s.chinamobile.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v3] mm/compaction: __compact_pgdat() code cleanuup

This patch uses is_via_compact_memory() to distinguish compaction
from sysfs or sysctl. And, this patch also reduces indentation
on compaction_defer_reset() by filtering these cases first
before checking watermark.

There is no functional change.

Acked-by: Yaowei Bai <baiyaowei@...s.chinamobile.com>
Acked-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/compaction.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index de3e1e7..01b1e5e 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1658,14 +1658,15 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
 				!compaction_deferred(zone, cc->order))
 			compact_zone(zone, cc);
 
-		if (cc->order > 0) {
-			if (zone_watermark_ok(zone, cc->order,
-						low_wmark_pages(zone), 0, 0))
-				compaction_defer_reset(zone, cc->order, false);
-		}
-
 		VM_BUG_ON(!list_empty(&cc->freepages));
 		VM_BUG_ON(!list_empty(&cc->migratepages));
+
+		if (is_via_compact_memory(cc->order))
+			continue;
+
+		if (zone_watermark_ok(zone, cc->order,
+				low_wmark_pages(zone), 0, 0))
+			compaction_defer_reset(zone, cc->order, false);
 	}
 }
 
-- 
1.9.1

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