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mm/vmstat: add helpers to get vmstat item names for each enum type

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Statistics in vmstat is combined from counters with different structure,
but names for them are merged into one array.

This patch adds trivial helpers to get name for each item:

  const char *zone_stat_name(enum zone_stat_item item);
  const char *numa_stat_name(enum numa_stat_item item);
  const char *node_stat_name(enum node_stat_item item);
  const char *writeback_stat_name(enum writeback_stat_item item);
  const char *vm_event_name(enum vm_event_item item);

Names for enum writeback_stat_item are folded in the middle of
vmstat_text so this patch moves declaration into header to calculate
offset of following items.

Also this patch reuses piece of node stat names for lru list names:

  const char *lru_list_name(enum lru_list lru);

This returns common lru list names: "inactive_anon", "active_anon",
"inactive_file", "active_file", "unevictable".

[khlebnikov@yandex-team.ru: do not use size of vmstat_text as count of /proc/vmstat items]
  Link: http://lkml.kernel.org/r/157152151769.4139.15423465513138349343.stgit@buzz
  Link: https://lore.kernel.org/linux-mm/cd1c42ae-281f-c8a8-70ac-1d01d417b2e1@infradead.org/T/#u
Link: http://lkml.kernel.org/r/157113012325.453.562783073839432766.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2019-12-04 16:49:50 -08:00 committed by Linus Torvalds
parent a264df74df
commit 9d7ea9a297
3 changed files with 73 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/base/node.c
View File

@ -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;

50
include/linux/vmstat.h
View File

@ -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 */

51
mm/vmstat.c
View File

@ -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;
}
}