linux-kernel - Re: [PATCH 03/14] net: tcp_memcontrol: properly detect ancestor socket pressure

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Date:	Fri, 13 Nov 2015 11:00:14 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...xchg.org
Cc:	akpm@...ux-foundation.org, vdavydov@...tuozzo.com, tj@...nel.org,
	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 03/14] net: tcp_memcontrol: properly detect ancestor
 socket pressure

From: Johannes Weiner <hannes@...xchg.org>
Date: Thu, 12 Nov 2015 18:41:22 -0500

> When charging socket memory, the code currently checks only the local
> page counter for excess to determine whether the memcg is under socket
> pressure. But even if the local counter is fine, one of the ancestors
> could have breached its limit, which should also force this child to
> enter socket pressure. This currently doesn't happen.
> 
> Fix this by using page_counter_try_charge() first. If that fails, it
> means that either the local counter or one of the ancestors are in
> excess of their limit, and the child should enter socket pressure.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: David S. Miller <davem@...emloft.net>
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