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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
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9
drivers/base/node.c
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@@ -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;