mm/vmscan: define macros for refaults in struct lruvec

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

Link: https://lkml.kernel.org/r/20220808005644.1721066-1-yang.yang29@zte.com.cn
Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index e24b40c52468a8550eb93c0a0a8c0a95684bea84..8f571dc7c5247f79b6b8ac5bbd08ada8a022e269 100644 (file)
--- 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 WORKINGSET_ANON 0
+#define WORKINGSET_FILE 1
 #define ANON_AND_FILE 2
 
 enum lruvec_flags {

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b2b1431352dcd8ea791cef0a5fec25602a3b94a3..428f8fa603311a95324a0029d6abd2fdae9b7b8c 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3230,7 +3230,7 @@ again:
 
                refaults = lruvec_page_state(target_lruvec,
                                WORKINGSET_ACTIVATE_ANON);
-               if (refaults != target_lruvec->refaults[0] ||
+               if (refaults != target_lruvec->refaults[WORKINGSET_ANON] ||
                        inactive_is_low(target_lruvec, LRU_INACTIVE_ANON))
                        sc->may_deactivate |= DEACTIVATE_ANON;
                else
@@ -3243,7 +3243,7 @@ again:
                 */
                refaults = lruvec_page_state(target_lruvec,
                                WORKINGSET_ACTIVATE_FILE);
-               if (refaults != target_lruvec->refaults[1] ||
+               if (refaults != target_lruvec->refaults[WORKINGSET_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[WORKINGSET_ANON] = refaults;
        refaults = lruvec_page_state(target_lruvec, WORKINGSET_ACTIVATE_FILE);
-       target_lruvec->refaults[1] = refaults;
+       target_lruvec->refaults[WORKINGSET_FILE] = refaults;
 }
 
 /*