On Mon, 3 Oct 2011 14:18:39 +0400
Glauber Costa <glommer@xxxxxxxxxxxxx> wrote:
> With all the infrastructure in place, this patch implements
> per-cgroup control for tcp memory pressure handling.
>
> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> CC: David S. Miller <davem@xxxxxxxxxxxxx>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> CC: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
One question.
> +void tcp_enter_memory_pressure(struct sock *sk)
> +{
> + struct mem_cgroup *memcg = sk->sk_cgrp;
> + if (!memcg->tcp.tcp_memory_pressure) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
> + memcg->tcp.tcp_memory_pressure = 1;
> + }
> +}
It seems memcg->tcp.tcp_memory_pressure has no locks and not atomic.
no problematic race ?
Thanks,
-Kame
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