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mm: memcontrol: remove double kmem page_counter init 

The kmem page_counter's limit is initialized to PAGE_COUNTER_MAX inside
mem_cgroup_css_online().  There is no need to repeat this from
memcg_propagate_kmem().

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-01-20 15:02:21 -08:00 committed by Linus Torvalds
parent 6d378dac7c
commit b15aac110a
1 changed files with 10 additions and 14 deletions
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24
mm/memcontrol.c
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@ -2861,8 +2861,7 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
}
#ifdef CONFIG_MEMCG_KMEM
static int memcg_activate_kmem(struct mem_cgroup *memcg,
unsigned long nr_pages)
static int memcg_activate_kmem(struct mem_cgroup *memcg)
{
int err = 0;
int memcg_id;
@ -2897,13 +2896,6 @@ static int memcg_activate_kmem(struct mem_cgroup *memcg,
goto out;
}
/*
* We couldn't have accounted to this cgroup, because it hasn't got
* activated yet, so this should succeed.
*/
err = page_counter_limit(&memcg->kmem, nr_pages);
VM_BUG_ON(err);
static_branch_inc(&memcg_kmem_enabled_key);
/*
* A memory cgroup is considered kmem-active as soon as it gets
@ -2924,10 +2916,14 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
int ret;
mutex_lock(&memcg_limit_mutex);
if (!memcg_kmem_is_active(memcg))
ret = memcg_activate_kmem(memcg, limit);
else
ret = page_counter_limit(&memcg->kmem, limit);
/* Top-level cgroup doesn't propagate from root */
if (!memcg_kmem_is_active(memcg)) {
ret = memcg_activate_kmem(memcg);
if (ret)
goto out;
}
ret = page_counter_limit(&memcg->kmem, limit);
out:
mutex_unlock(&memcg_limit_mutex);
return ret;
}
@ -2946,7 +2942,7 @@ static int memcg_propagate_kmem(struct mem_cgroup *memcg)
* after this point, because it has at least one child already.
*/
if (memcg_kmem_is_active(parent))
ret = memcg_activate_kmem(memcg, PAGE_COUNTER_MAX);
ret = memcg_activate_kmem(memcg);
mutex_unlock(&memcg_limit_mutex);
return ret;
}