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memcg: cleanup static keys decrement 

Move memcg_socket_limit_enabled decrement to tcp_destroy_cgroup (called
from memcg_destroy_kmem -> mem_cgroup_sockets_destroy) and zap a bunch of
wrapper functions.

Although this patch moves static keys decrement from __mem_cgroup_free to
mem_cgroup_css_free, it does not introduce any functional changes, because
the keys are incremented on setting the limit (tcp or kmem), which can
only happen after successful mem_cgroup_css_online.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Glauber Costa <glommer@parallels.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Vladimir Davydov 2015-02-12 14:59:56 -08:00 committed by Linus Torvalds
parent 932ff6bbbd
commit f48b80a5e2
3 changed files with 9 additions and 38 deletions
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5
include/net/sock.h
View File

@ -1077,11 +1077,6 @@ static inline bool memcg_proto_active(struct cg_proto *cg_proto)
return test_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags);
}
static inline bool memcg_proto_activated(struct cg_proto *cg_proto)
{
return test_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags);
}
#ifdef SOCK_REFCNT_DEBUG
static inline void sk_refcnt_debug_inc(struct sock *sk)
{

38
mm/memcontrol.c
View File

@ -519,16 +519,6 @@ struct cg_proto *tcp_proto_cgroup(struct mem_cgroup *memcg)
}
EXPORT_SYMBOL(tcp_proto_cgroup);
static void disarm_sock_keys(struct mem_cgroup *memcg)
{
if (!memcg_proto_activated(&memcg->tcp_mem))
return;
static_key_slow_dec(&memcg_socket_limit_enabled);
}
#else
static void disarm_sock_keys(struct mem_cgroup *memcg)
{
}
#endif
#ifdef CONFIG_MEMCG_KMEM
@ -583,28 +573,8 @@ void memcg_put_cache_ids(void)
struct static_key memcg_kmem_enabled_key;
EXPORT_SYMBOL(memcg_kmem_enabled_key);
static void disarm_kmem_keys(struct mem_cgroup *memcg)
{
if (memcg->kmem_acct_activated)
static_key_slow_dec(&memcg_kmem_enabled_key);
/*
* This check can't live in kmem destruction function,
* since the charges will outlive the cgroup
*/
WARN_ON(page_counter_read(&memcg->kmem));
}
#else
static void disarm_kmem_keys(struct mem_cgroup *memcg)
{
}
#endif /* CONFIG_MEMCG_KMEM */
static void disarm_static_keys(struct mem_cgroup *memcg)
{
disarm_sock_keys(memcg);
disarm_kmem_keys(memcg);
}
static struct mem_cgroup_per_zone *
mem_cgroup_zone_zoneinfo(struct mem_cgroup *memcg, struct zone *zone)
{
@ -4092,7 +4062,11 @@ static void memcg_deactivate_kmem(struct mem_cgroup *memcg)
static void memcg_destroy_kmem(struct mem_cgroup *memcg)
{
memcg_destroy_kmem_caches(memcg);
if (memcg->kmem_acct_activated) {
memcg_destroy_kmem_caches(memcg);
static_key_slow_dec(&memcg_kmem_enabled_key);
WARN_ON(page_counter_read(&memcg->kmem));
}
mem_cgroup_sockets_destroy(memcg);
}
#else
@ -4523,8 +4497,6 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg)
free_mem_cgroup_per_zone_info(memcg, node);
free_percpu(memcg->stat);
disarm_static_keys(memcg);
kfree(memcg);
}

4
net/ipv4/tcp_memcontrol.c
View File

@ -47,6 +47,10 @@ void tcp_destroy_cgroup(struct mem_cgroup *memcg)
return;
percpu_counter_destroy(&cg_proto->sockets_allocated);
if (test_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags))
static_key_slow_dec(&memcg_socket_limit_enabled);
}
EXPORT_SYMBOL(tcp_destroy_cgroup);