linux-kernel - Re: [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit

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Date:	Tue, 4 Oct 2011 10:21:14 +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
Subject: Re: [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit

On Mon,  3 Oct 2011 14:18:41 +0400
Glauber Costa <glommer@...allels.com> wrote:

> This patch uses the "tcp_max_mem" field of the kmem_cgroup to
> effectively control the amount of kernel memory pinned by a cgroup.
> 
> We have to make sure that none of the memory pressure thresholds
> specified in the namespace are bigger than the current cgroup.
> 
> 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>
> ---
>  Documentation/cgroups/memory.txt |    1 +
>  include/linux/memcontrol.h       |   10 +++++
>  include/net/tcp.h                |    1 +
>  mm/memcontrol.c                  |   76 +++++++++++++++++++++++++++++++++++---
>  net/ipv4/sysctl_net_ipv4.c       |   20 ++++++++++
>  5 files changed, 102 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 6f1954a..1ffde3e 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -78,6 +78,7 @@ Brief summary of control files.
>  
>   memory.independent_kmem_limit	 # select whether or not kernel memory limits are
>  				   independent of user limits
> + memory.kmem.tcp.max_memory      # set/show hard limit for tcp buf memory
>  

What is the releationship between tcp.max_memory and kmem_limit ?

tcp.max_memory < kmem_limit ?
usage of tcp memory is included in kmem usage ?


Thanks,
-Kame

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