diff --git a/drivers/base/node.c b/drivers/base/node.c
index 296546ffed6c124e949c47da292784958f4ca7b7..98a31bafc8a266ace27bf9002eaf9b0186a6fa96 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -496,20 +496,17 @@ static ssize_t node_read_vmstat(struct device *dev,
int n = 0;
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
- n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
+ n += sprintf(buf+n, "%s %lu\n", zone_stat_name(i),
sum_zone_node_page_state(nid, i));
#ifdef CONFIG_NUMA
for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
- n += sprintf(buf+n, "%s %lu\n",
- vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
+ n += sprintf(buf+n, "%s %lu\n", numa_stat_name(i),
sum_zone_numa_state(nid, i));
#endif
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
- n += sprintf(buf+n, "%s %lu\n",
- vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
- NR_VM_NUMA_STAT_ITEMS],
+ n += sprintf(buf+n, "%s %lu\n", node_stat_name(i),
node_page_state(pgdat, i));
return n;
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index bdeda4b079fe8987699fe620f3b1f51d2b875f2d..b995d8b680c2b54251b893b38bb58647ec8dc87c 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -31,6 +31,12 @@ struct reclaim_stat {
unsigned nr_unmap_fail;
};
+enum writeback_stat_item {
+ NR_DIRTY_THRESHOLD,
+ NR_DIRTY_BG_THRESHOLD,
+ NR_VM_WRITEBACK_STAT_ITEMS,
+};
+
#ifdef CONFIG_VM_EVENT_COUNTERS
/*
* Light weight per cpu counter implementation.
@@ -381,4 +387,48 @@ static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
extern const char * const vmstat_text[];
+static inline const char *zone_stat_name(enum zone_stat_item item)
+{
+ return vmstat_text[item];
+}
+
+#ifdef CONFIG_NUMA
+static inline const char *numa_stat_name(enum numa_stat_item item)
+{
+ return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
+ item];
+}
+#endif /* CONFIG_NUMA */
+
+static inline const char *node_stat_name(enum node_stat_item item)
+{
+ return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
+ NR_VM_NUMA_STAT_ITEMS +
+ item];
+}
+
+static inline const char *lru_list_name(enum lru_list lru)
+{
+ return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
+}
+
+static inline const char *writeback_stat_name(enum writeback_stat_item item)
+{
+ return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
+ NR_VM_NUMA_STAT_ITEMS +
+ NR_VM_NODE_STAT_ITEMS +
+ item];
+}
+
+#ifdef CONFIG_VM_EVENT_COUNTERS
+static inline const char *vm_event_name(enum vm_event_item item)
+{
+ return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
+ NR_VM_NUMA_STAT_ITEMS +
+ NR_VM_NODE_STAT_ITEMS +
+ NR_VM_WRITEBACK_STAT_ITEMS +
+ item];
+}
+#endif /* CONFIG_VM_EVENT_COUNTERS */
+
#endif /* _LINUX_VMSTAT_H */
diff --git a/mm/vmstat.c b/mm/vmstat.c
index a8222041bd44d648a4c8b5a1e5e345314efb050e..fa627329428b082566a48932180e07abcc36e3ee 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1134,7 +1134,7 @@ const char * const vmstat_text[] = {
"numa_other",
#endif
- /* Node-based counters */
+ /* enum node_stat_item counters */
"nr_inactive_anon",
"nr_active_anon",
"nr_inactive_file",
@@ -1564,10 +1564,8 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
if (is_zone_first_populated(pgdat, zone)) {
seq_printf(m, "\n per-node stats");
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
- seq_printf(m, "\n %-12s %lu",
- vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
- NR_VM_NUMA_STAT_ITEMS],
- node_page_state(pgdat, i));
+ seq_printf(m, "\n %-12s %lu", node_stat_name(i),
+ node_page_state(pgdat, i));
}
}
seq_printf(m,
@@ -1600,14 +1598,13 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
}
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
- seq_printf(m, "\n %-12s %lu", vmstat_text[i],
- zone_page_state(zone, i));
+ seq_printf(m, "\n %-12s %lu", zone_stat_name(i),
+ zone_page_state(zone, i));
#ifdef CONFIG_NUMA
for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
- seq_printf(m, "\n %-12s %lu",
- vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
- zone_numa_state_snapshot(zone, i));
+ seq_printf(m, "\n %-12s %lu", numa_stat_name(i),
+ zone_numa_state_snapshot(zone, i));
#endif
seq_printf(m, "\n pagesets");
@@ -1658,31 +1655,23 @@ static const struct seq_operations zoneinfo_op = {
.show = zoneinfo_show,
};
-enum writeback_stat_item {
- NR_DIRTY_THRESHOLD,
- NR_DIRTY_BG_THRESHOLD,
- NR_VM_WRITEBACK_STAT_ITEMS,
-};
+#define NR_VMSTAT_ITEMS (NR_VM_ZONE_STAT_ITEMS + \
+ NR_VM_NUMA_STAT_ITEMS + \
+ NR_VM_NODE_STAT_ITEMS + \
+ NR_VM_WRITEBACK_STAT_ITEMS + \
+ (IS_ENABLED(CONFIG_VM_EVENT_COUNTERS) ? \
+ NR_VM_EVENT_ITEMS : 0))
static void *vmstat_start(struct seq_file *m, loff_t *pos)
{
unsigned long *v;
- int i, stat_items_size;
+ int i;
- if (*pos >= ARRAY_SIZE(vmstat_text))
+ if (*pos >= NR_VMSTAT_ITEMS)
return NULL;
- stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) +
- NR_VM_NUMA_STAT_ITEMS * sizeof(unsigned long) +
- NR_VM_NODE_STAT_ITEMS * sizeof(unsigned long) +
- NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long);
-
-#ifdef CONFIG_VM_EVENT_COUNTERS
- stat_items_size += sizeof(struct vm_event_state);
-#endif
- BUILD_BUG_ON(stat_items_size !=
- ARRAY_SIZE(vmstat_text) * sizeof(unsigned long));
- v = kmalloc(stat_items_size, GFP_KERNEL);
+ BUILD_BUG_ON(ARRAY_SIZE(vmstat_text) < NR_VMSTAT_ITEMS);
+ v = kmalloc_array(NR_VMSTAT_ITEMS, sizeof(unsigned long), GFP_KERNEL);
m->private = v;
if (!v)
return ERR_PTR(-ENOMEM);
@@ -1715,7 +1704,7 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
{
(*pos)++;
- if (*pos >= ARRAY_SIZE(vmstat_text))
+ if (*pos >= NR_VMSTAT_ITEMS)
return NULL;
return (unsigned long *)m->private + *pos;
}
@@ -1781,7 +1770,7 @@ int vmstat_refresh(struct ctl_table *table, int write,
val = atomic_long_read(&vm_zone_stat[i]);
if (val < 0) {
pr_warn("%s: %s %ld\n",
- __func__, vmstat_text[i], val);
+ __func__, zone_stat_name(i), val);
err = -EINVAL;
}
}
@@ -1790,7 +1779,7 @@ int vmstat_refresh(struct ctl_table *table, int write,
val = atomic_long_read(&vm_numa_stat[i]);
if (val < 0) {
pr_warn("%s: %s %ld\n",
- __func__, vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], val);
+ __func__, numa_stat_name(i), val);
err = -EINVAL;
}
}