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

KAMEZAWA Hiroyuki
2011-10-04T01:22:08Z

On Mon, 3 Oct 2011 14:18:41 +0400
Glauber Costa <glommer@parallels.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@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.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