linux-kernel - Re: [PATCH 5/8] mm: memcontrol: account socket memory on unified hierarchy

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Message-ID: <20151023131956.GA15375@dhcp22.suse.cz>
Date:	Fri, 23 Oct 2015 15:19:56 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Tejun Heo <tj@...nel.org>, netdev@...r.kernel.org,
	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] mm: memcontrol: account socket memory on unified
 hierarchy

On Thu 22-10-15 00:21:33, Johannes Weiner wrote:
> Socket memory can be a significant share of overall memory consumed by
> common workloads. In order to provide reasonable resource isolation
> out-of-the-box in the unified hierarchy, this type of memory needs to
> be accounted and tracked per default in the memory controller.

What about users who do not want to pay an additional overhead for the
accounting? How can they disable it?

> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

[...]

> @@ -5453,10 +5470,9 @@ void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage)
>  	commit_charge(newpage, memcg, true);
>  }
>  
> -/* Writing them here to avoid exposing memcg's inner layout */
> -#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
> +#ifdef CONFIG_INET
>  
> -DEFINE_STATIC_KEY_FALSE(mem_cgroup_sockets);
> +DEFINE_STATIC_KEY_TRUE(mem_cgroup_sockets);

AFAIU this means that the jump label is enabled by default. Is this
intended when you enable it explicitly where needed?

>  
>  void sock_update_memcg(struct sock *sk)
>  {
-- 
Michal Hocko
SUSE Labs
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