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Subject[PATCH 3/6] memcg: hierarchical stat
From: KAMEZAWA Hiroyuki <kamzawa.hiroyu@jp.fujitsu.com>

Clean up memory.stat file routine and show "total" hierarchical stat.

This patch does
- renamed get_all_zonestat to be get_local_zonestat.
- remove old mem_cgroup_stat_desc, which is only for per-cpu stat.
- add mcs_stat to cover both of per-cpu/per-lru stat.
- add "total" stat of hierarchy (*)
- add a callback system to scan all memcg under a root.
== "total" is added.
[kamezawa@localhost ~]$ cat /opt/cgroup/xxx/memory.stat
cache 0
rss 0
pgpgin 0
pgpgout 0
inactive_anon 0
active_anon 0
inactive_file 0
active_file 0
unevictable 0
hierarchical_memory_limit 50331648
hierarchical_memsw_limit 9223372036854775807
total_cache 65536
total_rss 192512
total_pgpgin 218
total_pgpgout 155
total_inactive_anon 0
total_active_anon 135168
total_inactive_file 61440
total_active_file 4096
total_unevictable 0
==
(*) maybe the user can do calc hierarchical stat by his own program
in userland but if it can be written in clean way, it's worth to be
shown, I think.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

---
Index: mmotm-2.6.29-Jan16/mm/memcontrol.c
===================================================================
--- mmotm-2.6.29-Jan16.orig/mm/memcontrol.c
+++ mmotm-2.6.29-Jan16/mm/memcontrol.c
@@ -256,7 +256,7 @@ page_cgroup_zoneinfo(struct page_cgroup
return mem_cgroup_zoneinfo(mem, nid, zid);
}

-static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem,
+static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem,
enum lru_list idx)
{
int nid, zid;
@@ -317,6 +317,42 @@ static bool mem_cgroup_is_obsolete(struc
return css_is_removed(&mem->css);
}

+
+/*
+ * Call callback function against all cgroup under hierarchy tree.
+ */
+static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data,
+ int (*func)(struct mem_cgroup *, void *))
+{
+ int found, ret, nextid;
+ struct cgroup_subsys_state *css;
+ struct mem_cgroup *mem;
+
+ if (!root->use_hierarchy)
+ return (*func)(root, data);
+
+ nextid = 1;
+ do {
+ ret = 0;
+ mem = NULL;
+
+ rcu_read_lock();
+ css = css_get_next(&mem_cgroup_subsys, nextid, &root->css,
+ &found);
+ if (css && css_tryget(css))
+ mem = container_of(css, struct mem_cgroup, css);
+ rcu_read_unlock();
+
+ if (mem) {
+ ret = (*func)(mem, data);
+ css_put(&mem->css);
+ }
+ nextid = found + 1;
+ } while (!ret && css);
+
+ return ret;
+}
+
/*
* Following LRU functions are allowed to be used without PCG_LOCK.
* Operations are called by routine of global LRU independently from memcg.
@@ -510,8 +546,8 @@ static int calc_inactive_ratio(struct me
unsigned long gb;
unsigned long inactive_ratio;

- inactive = mem_cgroup_get_all_zonestat(memcg, LRU_INACTIVE_ANON);
- active = mem_cgroup_get_all_zonestat(memcg, LRU_ACTIVE_ANON);
+ inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_ANON);
+ active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_ANON);

gb = (inactive + active) >> (30 - PAGE_SHIFT);
if (gb)
@@ -1838,54 +1874,90 @@ static int mem_cgroup_reset(struct cgrou
return 0;
}

-static const struct mem_cgroup_stat_desc {
- const char *msg;
- u64 unit;
-} mem_cgroup_stat_desc[] = {
- [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, },
- [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, },
- [MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, },
- [MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, },
+
+/* For read statistics */
+enum {
+ MCS_CACHE,
+ MCS_RSS,
+ MCS_PGPGIN,
+ MCS_PGPGOUT,
+ MCS_INACTIVE_ANON,
+ MCS_ACTIVE_ANON,
+ MCS_INACTIVE_FILE,
+ MCS_ACTIVE_FILE,
+ MCS_UNEVICTABLE,
+ NR_MCS_STAT,
+};
+
+struct mcs_total_stat {
+ s64 stat[NR_MCS_STAT];
+};
+
+struct {
+ char *local_name;
+ char *total_name;
+} memcg_stat_strings[NR_MCS_STAT] = {
+ {"cache", "total_cache"},
+ {"rss", "total_rss"},
+ {"pgpgin", "total_pgpgin"},
+ {"pgpgout", "total_pgpgout"},
+ {"inactive_anon", "total_inactive_anon"},
+ {"active_anon", "total_active_anon"},
+ {"inactive_file", "total_inactive_file"},
+ {"active_file", "total_active_file"},
+ {"unevictable", "total_unevictable"}
};

+
+static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data)
+{
+ struct mcs_total_stat *s = data;
+ s64 val;
+
+ /* per cpu stat */
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_CACHE);
+ s->stat[MCS_CACHE] += val * PAGE_SIZE;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
+ s->stat[MCS_RSS] += val * PAGE_SIZE;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_PGPGIN_COUNT);
+ s->stat[MCS_PGPGIN] += val;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_PGPGOUT_COUNT);
+ s->stat[MCS_PGPGOUT] += val;
+
+ /* per zone stat */
+ val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON);
+ s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_ANON);
+ s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_FILE);
+ s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_FILE);
+ s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE);
+ s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE;
+ return 0;
+}
+
+static void
+mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s)
+{
+ mem_cgroup_walk_tree(mem, s, mem_cgroup_get_local_stat);
+}
+
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
struct cgroup_map_cb *cb)
{
struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
- struct mem_cgroup_stat *stat = &mem_cont->stat;
+ struct mcs_total_stat mystat;
int i;

- for (i = 0; i < ARRAY_SIZE(stat->cpustat[0].count); i++) {
- s64 val;
+ memset(&mystat, 0, sizeof(mystat));
+ mem_cgroup_get_local_stat(mem_cont, &mystat);

- val = mem_cgroup_read_stat(stat, i);
- val *= mem_cgroup_stat_desc[i].unit;
- cb->fill(cb, mem_cgroup_stat_desc[i].msg, val);
- }
- /* showing # of active pages */
- {
- unsigned long active_anon, inactive_anon;
- unsigned long active_file, inactive_file;
- unsigned long unevictable;
-
- inactive_anon = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_INACTIVE_ANON);
- active_anon = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_ACTIVE_ANON);
- inactive_file = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_INACTIVE_FILE);
- active_file = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_ACTIVE_FILE);
- unevictable = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_UNEVICTABLE);
-
- cb->fill(cb, "active_anon", (active_anon) * PAGE_SIZE);
- cb->fill(cb, "inactive_anon", (inactive_anon) * PAGE_SIZE);
- cb->fill(cb, "active_file", (active_file) * PAGE_SIZE);
- cb->fill(cb, "inactive_file", (inactive_file) * PAGE_SIZE);
- cb->fill(cb, "unevictable", unevictable * PAGE_SIZE);
+ for (i = 0; i < NR_MCS_STAT; i++)
+ cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]);

- }
+ /* Hierarchical information */
{
unsigned long long limit, memsw_limit;
memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit);
@@ -1894,6 +1966,12 @@ static int mem_control_stat_show(struct
cb->fill(cb, "hierarchical_memsw_limit", memsw_limit);
}

+ memset(&mystat, 0, sizeof(mystat));
+ mem_cgroup_get_total_stat(mem_cont, &mystat);
+ for (i = 0; i < NR_MCS_STAT; i++)
+ cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]);
+
+
#ifdef CONFIG_DEBUG_VM
cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL));



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