linux-kernel - Re: [PATCH 06/14] net: tcp_memcontrol: remove dead per-memcg count of allocated sockets

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Message-ID: <20151120094823.GY31308@esperanza>
Date:	Fri, 20 Nov 2015 12:48:23 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	<netdev@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel-team@...com>
Subject: Re: [PATCH 06/14] net: tcp_memcontrol: remove dead per-memcg count
 of allocated sockets

On Thu, Nov 12, 2015 at 06:41:25PM -0500, Johannes Weiner wrote:
> The number of allocated sockets is used for calculations in the soft
> limit phase, where packets are accepted but the socket is under memory
> pressure. Since there is no soft limit phase in tcp_memcontrol, and
> memory pressure is only entered when packets are already dropped, this
> is actually dead code. Remove it.

Actually, we can get into the soft limit phase due to the global limit
(tcp_memory_pressure is set), but then using per-memcg sockets_allocated
counter is just wrong.

> 
> As this is the last user of parent_cg_proto(), remove that too.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Vladimir Davydov <vdavydov@...tuozzo.com>
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