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Subject[PATCH] mm/vmscan: define macros for refaults in struct lruvec
Date
From: Yang Yang <yang.yang29@zte.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@zte.com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@gmail.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
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