提交 fee7b548 编写于 作者: K KAMEZAWA Hiroyuki 提交者: Linus Torvalds

memcg: show real limit under hierarchy mode

Show "real" limit of memcg.  This helps my debugging and maybe useful for
users.

While testing hierarchy like this

	mount -t cgroup none /cgroup -t memory
	mkdir /cgroup/A
	set use_hierarchy==1 to "A"
	mkdir /cgroup/A/01
	mkdir /cgroup/A/01/02
	mkdir /cgroup/A/01/03
	mkdir /cgroup/A/01/03/04
	mkdir /cgroup/A/08
	mkdir /cgroup/A/08/01
	....
and set each own limit to them, "real" limit of each memcg is unclear.
This patch shows real limit by checking all ancestors.

Changelog: (v1) -> (v2)
	- remove "if" and use "min(a,b)"
Acked-by: NBalbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 c772be93
......@@ -1782,6 +1782,34 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
return ret;
}
static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
unsigned long long *mem_limit, unsigned long long *memsw_limit)
{
struct cgroup *cgroup;
unsigned long long min_limit, min_memsw_limit, tmp;
min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
cgroup = memcg->css.cgroup;
if (!memcg->use_hierarchy)
goto out;
while (cgroup->parent) {
cgroup = cgroup->parent;
memcg = mem_cgroup_from_cont(cgroup);
if (!memcg->use_hierarchy)
break;
tmp = res_counter_read_u64(&memcg->res, RES_LIMIT);
min_limit = min(min_limit, tmp);
tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
min_memsw_limit = min(min_memsw_limit, tmp);
}
out:
*mem_limit = min_limit;
*memsw_limit = min_memsw_limit;
return;
}
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
{
struct mem_cgroup *mem;
......@@ -1855,6 +1883,13 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
cb->fill(cb, "unevictable", unevictable * PAGE_SIZE);
}
{
unsigned long long limit, memsw_limit;
memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit);
cb->fill(cb, "hierarchical_memory_limit", limit);
if (do_swap_account)
cb->fill(cb, "hierarchical_memsw_limit", memsw_limit);
}
#ifdef CONFIG_DEBUG_VM
cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL));
......
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