Re: [PATCH 10/14] mm: memcontrol: generalize the socket accounting jump label

Michal Hocko
2015-11-13T10:43:17Z

On Thu 12-11-15 18:41:29, Johannes Weiner wrote:
> The unified hierarchy memory controller is going to use this jump
> label as well to control the networking callbacks. Move it to the
> memory controller code and give it a more generic name.
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Yes it makes more sense in memcg proper
Acked-by: Michal Hocko <mhocko@suse.com>

> ---
> include/linux/memcontrol.h | 4 ++++
> include/net/sock.h | 7 -------
> mm/memcontrol.c | 3 +++
> net/core/sock.c | 5 -----
> net/ipv4/tcp_memcontrol.c | 4 ++--
> 5 files changed, 9 insertions(+), 14 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 1c71f27..4cf5afa 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -693,6 +693,8 @@ static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
>
> #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
> struct sock;
> +extern struct static_key memcg_sockets_enabled_key;
> +#define mem_cgroup_sockets_enabled static_key_false(&memcg_sockets_enabled_key)
> void sock_update_memcg(struct sock *sk);
> void sock_release_memcg(struct sock *sk);
> bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
> @@ -701,6 +703,8 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
> {
> return memcg->tcp_mem.memory_pressure;
> }
> +#else
> +#define mem_cgroup_sockets_enabled 0
> #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
>
> #ifdef CONFIG_MEMCG_KMEM
> diff --git a/include/net/sock.h b/include/net/sock.h
> index b439dcc..bf1b901 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1065,13 +1065,6 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
> #define sk_refcnt_debug_release(sk) do { } while (0)
> #endif /* SOCK_REFCNT_DEBUG */
>
> -#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET)
> -extern struct static_key memcg_socket_limit_enabled;
> -#define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled)
> -#else
> -#define mem_cgroup_sockets_enabled 0
> -#endif
> -
> static inline bool sk_stream_memory_free(const struct sock *sk)
> {
> if (sk->sk_wmem_queued >= sk->sk_sndbuf)
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 89b1d9e..658bef2 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -291,6 +291,9 @@ static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
> /* Writing them here to avoid exposing memcg's inner layout */
> #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
>
> +struct static_key memcg_sockets_enabled_key;
> +EXPORT_SYMBOL(memcg_sockets_enabled_key);
> +
> void sock_update_memcg(struct sock *sk)
> {
> struct mem_cgroup *memcg;
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 6486b0d..c5435b5 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -201,11 +201,6 @@ EXPORT_SYMBOL(sk_net_capable);
> static struct lock_class_key af_family_keys[AF_MAX];
> static struct lock_class_key af_family_slock_keys[AF_MAX];
>
> -#if defined(CONFIG_MEMCG_KMEM)
> -struct static_key memcg_socket_limit_enabled;
> -EXPORT_SYMBOL(memcg_socket_limit_enabled);
> -#endif
> -
> /*
> * Make lock validator output more readable. (we pre-construct these
> * strings build-time, so that runtime initialization of socket
> diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
> index 47addc3..17df9dd 100644
> --- a/net/ipv4/tcp_memcontrol.c
> +++ b/net/ipv4/tcp_memcontrol.c
> @@ -34,7 +34,7 @@ void tcp_destroy_cgroup(struct mem_cgroup *memcg)
> return;
>
> if (test_bit(MEMCG_SOCK_ACTIVATED, &memcg->tcp_mem.flags))
> - static_key_slow_dec(&memcg_socket_limit_enabled);
> + static_key_slow_dec(&memcg_sockets_enabled_key);
> }
>
> static int tcp_update_limit(struct mem_cgroup *memcg, unsigned long nr_pages)
> @@ -73,7 +73,7 @@ static int tcp_update_limit(struct mem_cgroup *memcg, unsigned long nr_pages)
> */
> if (!test_and_set_bit(MEMCG_SOCK_ACTIVATED,
> &memcg->tcp_mem.flags))
> - static_key_slow_inc(&memcg_socket_limit_enabled);
> + static_key_slow_inc(&memcg_sockets_enabled_key);
> set_bit(MEMCG_SOCK_ACTIVE, &memcg->tcp_mem.flags);
> }
>
> --
> 2.6.2

--
Michal Hocko
SUSE Labs