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

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Message-Id: <1315369399-3073-10-git-send-email-glommer@parallels.com>
Date:	Wed,  7 Sep 2011 01:23:19 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, containers@...ts.osdl.org,
	netdev@...r.kernel.org, xemul@...allels.com,
	Glauber Costa <glommer@...allels.com>,
	"David S. Miller" <davem@...emloft.net>,
	Hiroyouki Kamezawa <kamezawa.hiroyu@...fujitsu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: [PATCH v2 9/9] Add documentation about kmem_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>
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
+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
+are tcp send and receive 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
+	tcp sockets inside the cgroup. 
+
+	kmem.tcp_current_memory: current amount in bytes used by all sockets in
+	this cgroup
-- 
1.7.6

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