linux-kernel - [PATCH 3/3] mm/compaction: add an is_via_compact

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Date:	Wed, 16 Sep 2015 20:00:00 +0800
From:	Yaowei Bai <bywxiaobai@....com>
To:	akpm@...ux-foundation.org, mgorman@...e.de, mhocko@...nel.org,
	rientjes@...gle.com, hannes@...xchg.org, vdavydov@...allels.com,
	oleg@...hat.com, vbabka@...e.cz, iamjoonsoo.kim@....com,
	zhangyanfei@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] mm/compaction: add an is_via_compact_memory helper function

Introduce is_via_compact_memory helper function indicating compacting
via /proc/sys/vm/compact_memory to improve readability.

To catch this situation in __compaction_suitable, use order as parameter
directly instead of using struct compact_control.

This patch has no functional changes.

Signed-off-by: Yaowei Bai <bywxiaobai@....com>
---
 mm/compaction.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index c5c627a..a8e6593 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1197,6 +1197,15 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
 	return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE;
 }
 
+/*
+ * order == -1 is expected when compacting via
+ * /proc/sys/vm/compact_memory
+ */
+static inline bool is_via_compact_memory(int order)
+{
+	return order == -1;
+}
+
 static int __compact_finished(struct zone *zone, struct compact_control *cc,
 			    const int migratetype)
 {
@@ -1223,11 +1232,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc,
 		return COMPACT_COMPLETE;
 	}
 
-	/*
-	 * order == -1 is expected when compacting via
-	 * /proc/sys/vm/compact_memory
-	 */
-	if (cc->order == -1)
+	if (is_via_compact_memory(cc->order))
 		return COMPACT_CONTINUE;
 
 	/* Compaction run is not finished if the watermark is not met */
@@ -1290,11 +1295,7 @@ static unsigned long __compaction_suitable(struct zone *zone, int order,
 	int fragindex;
 	unsigned long watermark;
 
-	/*
-	 * order == -1 is expected when compacting via
-	 * /proc/sys/vm/compact_memory
-	 */
-	if (order == -1)
+	if (is_via_compact_memory(order))
 		return COMPACT_CONTINUE;
 
 	watermark = low_wmark_pages(zone);
@@ -1658,10 +1659,11 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
 		 * this makes sure we compact the whole zone regardless of
 		 * cached scanner positions.
 		 */
-		if (cc->order == -1)
+		if (is_via_compact_memory(cc->order))
 			__reset_isolation_suitable(zone);
 
-		if (cc->order == -1 || !compaction_deferred(zone, cc->order))
+		if (is_via_compact_memory(cc->order) ||
+				!compaction_deferred(zone, cc->order))
 			compact_zone(zone, cc);
 
 		if (cc->order > 0) {
-- 
1.9.1


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