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SubjectRe: [PATCH v8 3/9] socket: initial cgroup code.
On Mon,  5 Dec 2011 19:34:57 -0200
Glauber Costa <glommer@parallels.com> wrote:

> The goal of this work is to move the memory pressure tcp
> controls to a cgroup, instead of just relying on global
> conditions.
>
> To avoid excessive overhead in the network fast paths,
> the code that accounts allocated memory to a cgroup is
> hidden inside a static_branch(). This branch is patched out
> until the first non-root cgroup is created. So when nobody
> is using cgroups, even if it is mounted, no significant performance
> penalty should be seen.
>
> This patch handles the generic part of the code, and has nothing
> tcp-specific.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: Kirill A. Shutemov <kirill@shutemov.name>
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtsu.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Eric W. Biederman <ebiederm@xmission.com>
> CC: Eric Dumazet <eric.dumazet@gmail.com>

I already replied Reviewed-by: but...


> +/* Writing them here to avoid exposing memcg's inner layout */
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +#ifdef CONFIG_INET
> +#include <net/sock.h>
> +
> +static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
> +void sock_update_memcg(struct sock *sk)
> +{
> + /* A socket spends its whole life in the same cgroup */
> + if (sk->sk_cgrp) {
> + WARN_ON(1);
> + return;
> + }
> + if (static_branch(&memcg_socket_limit_enabled)) {
> + struct mem_cgroup *memcg;
> +
> + BUG_ON(!sk->sk_prot->proto_cgroup);
> +
> + rcu_read_lock();
> + memcg = mem_cgroup_from_task(current);
> + if (!mem_cgroup_is_root(memcg)) {
> + mem_cgroup_get(memcg);
> + sk->sk_cgrp = sk->sk_prot->proto_cgroup(memcg);
> + }
> + rcu_read_unlock();
> + }
> +}

Here, you do mem_cgroup_get() if !mem_cgroup_is_root().


> +EXPORT_SYMBOL(sock_update_memcg);
> +
> +void sock_release_memcg(struct sock *sk)
> +{
> + if (static_branch(&memcg_socket_limit_enabled) && sk->sk_cgrp) {
> + struct mem_cgroup *memcg;
> + WARN_ON(!sk->sk_cgrp->memcg);
> + memcg = sk->sk_cgrp->memcg;
> + mem_cgroup_put(memcg);
> + }
> +}
>

You don't check !mem_cgroup_is_root(). Hm, root memcg will not be freed
by this ?

Thanks,
-Kame




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