netdev - Re: [PATCH v8 3/9] socket: initial cgroup code.

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Date:	Fri, 9 Dec 2011 11:05:50 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, lizf@...fujitsu.com,
	ebiederm@...ssion.com, davem@...emloft.net, gthelen@...gle.com,
	netdev@...r.kernel.org, linux-mm@...ck.org, kirill@...temov.name,
	avagin@...allels.com, devel@...nvz.org, eric.dumazet@...il.com,
	cgroups@...r.kernel.org, hannes@...xchg.org, mhocko@...e.cz,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujtsu.com>
Subject: Re: [PATCH v8 3/9] socket: initial cgroup code.

On Mon,  5 Dec 2011 19:34:57 -0200
Glauber Costa <glommer@...allels.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@...allels.com>
> CC: Kirill A. Shutemov <kirill@...temov.name>
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujtsu.com>
> CC: David S. Miller <davem@...emloft.net>
> CC: Eric W. Biederman <ebiederm@...ssion.com>
> CC: Eric Dumazet <eric.dumazet@...il.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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