linux-kernel - Re: [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling.

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Message-Id: <20111013145353.161009ea.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 13 Oct 2011 14:53:53 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, paul@...lmenage.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
Subject: Re: [PATCH v6 3/8] foundations of per-cgroup memory pressure
 controlling.

On Mon, 10 Oct 2011 14:24:23 +0400
Glauber Costa <glommer@...allels.com> wrote:

> This patch converts struct sock fields memory_pressure,
> memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
> to function pointers, receiving a struct mem_cgroup parameter.
> 
> enter_memory_pressure is kept the same, since all its callers
> have socket a context, and the kmem_cgroup can be derived from
> the socket itself.
> 
> To keep things working, the patch convert all users of those fields
> to use acessor functions.
> 
> In my benchmarks I didn't see a significant performance difference
> with this patch applied compared to a baseline (around 1 % diff, thus
> inside error margin).
> 
> Signed-off-by: Glauber Costa <glommer@...allels.com>
> CC: David S. Miller <davem@...emloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@...fujitsu.com>
> CC: Eric W. Biederman <ebiederm@...ssion.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

a nitpick.


>  #ifdef CONFIG_INET
> +enum {
> +	UNDER_LIMIT,
> +	OVER_LIMIT,
> +};
> +

It may be better to move this to res_counter.h or memcontrol.h


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