linux-kernel - [PATCH] mm/vmscan: define macros for refaults in struct lruvec

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Date:   Tue,  2 Aug 2022 07:10:13 +0000
From:   cgel.zte@...il.com
To:     akpm@...ux-foundation.org, hannes@...xchg.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Yang Yang <yang.yang29@....com.cn>,
        CGEL ZTE <cgel.zte@...il.com>
Subject: [PATCH] mm/vmscan: define macros for refaults in struct lruvec

From: Yang Yang <yang.yang29@....com.cn>

The magic number 0 and 1 are used in several places in vmscan.c.
Define macros for them to improve code readability.

Signed-off-by: Yang Yang <yang.yang29@....com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@...il.com>
---
 include/linux/mmzone.h | 2 ++
 mm/vmscan.c            | 8 ++++----
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index e24b40c52468..795076c33163 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -306,6 +306,8 @@ static inline bool is_active_lru(enum lru_list lru)
 	return (lru == LRU_ACTIVE_ANON || lru == LRU_ACTIVE_FILE);
 }
 
+#define ANON 0
+#define FILE 1
 #define ANON_AND_FILE 2
 
 enum lruvec_flags {
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b2b1431352dc..f6a54c25ac7d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3230,7 +3230,7 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 
 		refaults = lruvec_page_state(target_lruvec,
 				WORKINGSET_ACTIVATE_ANON);
-		if (refaults != target_lruvec->refaults[0] ||
+		if (refaults != target_lruvec->refaults[ANON] ||
 			inactive_is_low(target_lruvec, LRU_INACTIVE_ANON))
 			sc->may_deactivate |= DEACTIVATE_ANON;
 		else
@@ -3243,7 +3243,7 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 		 */
 		refaults = lruvec_page_state(target_lruvec,
 				WORKINGSET_ACTIVATE_FILE);
-		if (refaults != target_lruvec->refaults[1] ||
+		if (refaults != target_lruvec->refaults[FILE] ||
 		    inactive_is_low(target_lruvec, LRU_INACTIVE_FILE))
 			sc->may_deactivate |= DEACTIVATE_FILE;
 		else
@@ -3559,9 +3559,9 @@ static void snapshot_refaults(struct mem_cgroup *target_memcg, pg_data_t *pgdat)
 
 	target_lruvec = mem_cgroup_lruvec(target_memcg, pgdat);
 	refaults = lruvec_page_state(target_lruvec, WORKINGSET_ACTIVATE_ANON);
-	target_lruvec->refaults[0] = refaults;
+	target_lruvec->refaults[ANON] = refaults;
 	refaults = lruvec_page_state(target_lruvec, WORKINGSET_ACTIVATE_FILE);
-	target_lruvec->refaults[1] = refaults;
+	target_lruvec->refaults[FILE] = refaults;
 }
 
 /*
-- 
2.25.1