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authorJohannes Weiner <hannes@cmpxchg.org>2016-01-14 15:21:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-14 16:00:49 -0800
commit3d596f7b907b0281b997cf30c92994a71ad0a1a9 (patch)
treec039825abb7b78cc1cbe3d06e2a2fe481f81f3af /net/ipv4
parent931f3f4beb031cd483c1c8ab159ef1f8bdbe8888 (diff)
downloadop-kernel-dev-3d596f7b907b0281b997cf30c92994a71ad0a1a9.zip
op-kernel-dev-3d596f7b907b0281b997cf30c92994a71ad0a1a9.tar.gz
net: tcp_memcontrol: protect all tcp_memcontrol calls by jump-label
Move the jump-label from sock_update_memcg() and sock_release_memcg() to the callsite, and so eliminate those function calls when socket accounting is not enabled. This also eliminates the need for dummy functions because the calls will be optimized away if the Kconfig options are not enabled. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp.c3
-rw-r--r--net/ipv4/tcp_ipv4.c4
2 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 7bb1b09..fd17eec 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -422,7 +422,8 @@ void tcp_init_sock(struct sock *sk)
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
local_bh_disable();
- sock_update_memcg(sk);
+ if (mem_cgroup_sockets_enabled)
+ sock_update_memcg(sk);
sk_sockets_allocated_inc(sk);
local_bh_enable();
}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 65947c1..eb39e02 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1818,7 +1818,9 @@ void tcp_v4_destroy_sock(struct sock *sk)
tcp_saved_syn_free(tp);
sk_sockets_allocated_dec(sk);
- sock_release_memcg(sk);
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ sock_release_memcg(sk);
}
EXPORT_SYMBOL(tcp_v4_destroy_sock);
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