netdev - Re: [PATCH v2 9/9] Add documentation about kmem

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Date:	Thu, 08 Sep 2011 10:46:24 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Glauber Costa <glommer@...allels.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, netdev@...r.kernel.org,
	xemul@...allels.com, "David S. Miller" <davem@...emloft.net>,
	Hiroyouki Kamezawa <kamezawa.hiroyu@...fujitsu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v2 9/9] Add documentation about kmem_cgroup

On 09/06/11 21:23, Glauber Costa wrote:
> 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>
> CC: Randy Dunlap <rdunlap@...otime.net>
> ---
>  Documentation/cgroups/kmem_cgroups.txt |   27 +++++++++++++++++++++++++++
>  1 files changed, 27 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/cgroups/kmem_cgroups.txt
> 
> diff --git a/Documentation/cgroups/kmem_cgroups.txt b/Documentation/cgroups/kmem_cgroups.txt
> new file mode 100644
> index 0000000..930e069
> --- /dev/null
> +++ b/Documentation/cgroups/kmem_cgroups.txt
> @@ -0,0 +1,27 @@
> +Kernel Memory Cgroup
> +====================
> +
> +This document briefly describes the kernel memory cgroup, or "kmem cgroup".
> +Unlike user memory, kernel memory cannot be swapped. This effectively means
> +that rogue processes can start operations that pin kernel objects permanently
> +into memory, exhausting resources of all other processes in the system.
> +
> +kmem_cgroup main goal is to control the amount of memory a group of processes

   kmem_cgroup's main goal

> +can pin at any given point in time. Other uses of this infrastructure are
> +expected to come up with time. Right now, the only resource effectively limited

                                                      resources

> +are tcp send and receive buffers.

or:
                                             the only resource effectively limited
  is TCP network buffers.

> +
> +TCP network buffers
> +===================
> +
> +TCP network buffers, both on the send and receive sides, can be controlled
> +by the kmem cgroup. Once a socket is created, it is attached to the cgroup of
> +the controller process, where it stays until the end of its lifetime.
> +
> +Files
> +=====
> +	kmem.tcp_maxmem: control the maximum amount in bytes that can be used by

	                 controls the maximum amount of memory in bytes ...


> +	tcp sockets inside the cgroup. 
> +
> +	kmem.tcp_current_memory: current amount in bytes used by all sockets in

	                         current amount of memory in bytes ...

> +	this cgroup


-- 
~Randy
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