linux-kernel - [PATCH 5/5] mm: compaction: Avoid fragmentation score calculation for empty zones

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Message-Id: <100331ad9d274a9725e687b00d85d75d7e4a17c7.1673342761.git.baolin.wang@linux.alibaba.com>
Date:   Tue, 10 Jan 2023 21:36:22 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] mm: compaction: Avoid fragmentation score calculation for empty zones

There is no need to calculate the fragmentation score for empty zones.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/compaction.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index 0fd6c81a7809..b758b00a4885 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2025,6 +2025,8 @@ static unsigned int fragmentation_score_node(pg_data_t *pgdat)
 		struct zone *zone;
 
 		zone = &pgdat->node_zones[zoneid];
+		if (!populated_zone(zone))
+			continue;
 		score += fragmentation_score_zone_weighted(zone);
 	}
 
-- 
2.27.0