Messages in this thread Patch in this message | | | From | Abel Wu <> | Subject | [PATCH net-next] inet: Save one atomic op if no memcg to charge | Date | Mon, 19 Jun 2023 16:25:47 +0800 |
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If there is no net-memcg associated with the sock, don't bother calculating its memory usage for charge.
Signed-off-by: Abel Wu <wuyun.abel@bytedance.com> --- net/ipv4/inet_connection_sock.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 65ad4251f6fd..73798282c1ef 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -706,20 +706,24 @@ struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern) out: release_sock(sk); if (newsk && mem_cgroup_sockets_enabled) { - int amt; + int amt = 0; /* atomically get the memory usage, set and charge the * newsk->sk_memcg. */ lock_sock(newsk); - /* The socket has not been accepted yet, no need to look at - * newsk->sk_wmem_queued. - */ - amt = sk_mem_pages(newsk->sk_forward_alloc + - atomic_read(&newsk->sk_rmem_alloc)); mem_cgroup_sk_alloc(newsk); - if (newsk->sk_memcg && amt) + if (newsk->sk_memcg) { + /* The socket has not been accepted yet, no need + * to look at newsk->sk_wmem_queued. + */ + amt = sk_mem_pages(newsk->sk_forward_alloc + + atomic_read(&newsk->sk_rmem_alloc)); + + } + + if (amt) mem_cgroup_charge_skmem(newsk->sk_memcg, amt, GFP_KERNEL | __GFP_NOFAIL); -- 2.37.3
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