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mm: memcontrol: make tree_{stat,events} fetch all stats

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Currently, tree_{stat,events} helpers can only get one stat index at a
time, so when there are a lot of stats to be reported one has to call it
over and over again (see memory_stat_show).  This is neither effective,
nor does it look good.  Instead, let's make these helpers take a
snapshot of all available counters.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2016-03-17 14:17:32 -07:00 committed by Linus Torvalds
parent fcff7d7eeb
commit 72b54e7314
1 changed files with 39 additions and 28 deletions
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67
mm/memcontrol.c
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@ -2717,39 +2717,48 @@ static int mem_cgroup_hierarchy_write(struct cgroup_subsys_state *css,
return retval;
}
static unsigned long tree_stat(struct mem_cgroup *memcg,
enum mem_cgroup_stat_index idx)
static void tree_stat(struct mem_cgroup *memcg, unsigned long *stat)
{
struct mem_cgroup *iter;
unsigned long val = 0;
int i;
for_each_mem_cgroup_tree(iter, memcg)
val += mem_cgroup_read_stat(iter, idx);
memset(stat, 0, sizeof(*stat) * MEMCG_NR_STAT);
return val;
for_each_mem_cgroup_tree(iter, memcg) {
for (i = 0; i < MEMCG_NR_STAT; i++)
stat[i] += mem_cgroup_read_stat(iter, i);
}
}
static unsigned long tree_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx)
static void tree_events(struct mem_cgroup *memcg, unsigned long *events)
{
struct mem_cgroup *iter;
unsigned long val = 0;
int i;
for_each_mem_cgroup_tree(iter, memcg)
val += mem_cgroup_read_events(iter, idx);
memset(events, 0, sizeof(*events) * MEMCG_NR_EVENTS);
return val;
for_each_mem_cgroup_tree(iter, memcg) {
for (i = 0; i < MEMCG_NR_EVENTS; i++)
events[i] += mem_cgroup_read_events(iter, i);
}
}
static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
{
unsigned long val;
unsigned long val = 0;
if (mem_cgroup_is_root(memcg)) {
val = tree_stat(memcg, MEM_CGROUP_STAT_CACHE);
val += tree_stat(memcg, MEM_CGROUP_STAT_RSS);
if (swap)
val += tree_stat(memcg, MEM_CGROUP_STAT_SWAP);
struct mem_cgroup *iter;
for_each_mem_cgroup_tree(iter, memcg) {
val += mem_cgroup_read_stat(iter,
MEM_CGROUP_STAT_CACHE);
val += mem_cgroup_read_stat(iter,
MEM_CGROUP_STAT_RSS);
if (swap)
val += mem_cgroup_read_stat(iter,
MEM_CGROUP_STAT_SWAP);
}
} else {
if (!swap)
val = page_counter_read(&memcg->memory);
@ -5075,6 +5084,8 @@ static int memory_events_show(struct seq_file *m, void *v)
static int memory_stat_show(struct seq_file *m, void *v)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
unsigned long stat[MEMCG_NR_STAT];
unsigned long events[MEMCG_NR_EVENTS];
int i;
/*
@ -5088,22 +5099,22 @@ static int memory_stat_show(struct seq_file *m, void *v)
* Current memory state:
*/
tree_stat(memcg, stat);
tree_events(memcg, events);
seq_printf(m, "anon %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_RSS) * PAGE_SIZE);
(u64)stat[MEM_CGROUP_STAT_RSS] * PAGE_SIZE);
seq_printf(m, "file %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_CACHE) * PAGE_SIZE);
(u64)stat[MEM_CGROUP_STAT_CACHE] * PAGE_SIZE);
seq_printf(m, "sock %llu\n",
(u64)tree_stat(memcg, MEMCG_SOCK) * PAGE_SIZE);
(u64)stat[MEMCG_SOCK] * PAGE_SIZE);
seq_printf(m, "file_mapped %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED) *
PAGE_SIZE);
(u64)stat[MEM_CGROUP_STAT_FILE_MAPPED] * PAGE_SIZE);
seq_printf(m, "file_dirty %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_DIRTY) *
PAGE_SIZE);
(u64)stat[MEM_CGROUP_STAT_DIRTY] * PAGE_SIZE);
seq_printf(m, "file_writeback %llu\n",
(u64)tree_stat(memcg, MEM_CGROUP_STAT_WRITEBACK) *
PAGE_SIZE);
(u64)stat[MEM_CGROUP_STAT_WRITEBACK] * PAGE_SIZE);
for (i = 0; i < NR_LRU_LISTS; i++) {
struct mem_cgroup *mi;
@ -5118,9 +5129,9 @@ static int memory_stat_show(struct seq_file *m, void *v)
/* Accumulated memory events */
seq_printf(m, "pgfault %lu\n",
tree_events(memcg, MEM_CGROUP_EVENTS_PGFAULT));
events[MEM_CGROUP_EVENTS_PGFAULT]);
seq_printf(m, "pgmajfault %lu\n",
tree_events(memcg, MEM_CGROUP_EVENTS_PGMAJFAULT));
events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
return 0;
}