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Date:	Sun, 01 Mar 2009 12:00:05 +0530
From:	Balbir Singh <>
Cc:	Sudhir Kumar <>,
	YAMAMOTO Takashi <>,
	Bharata B Rao <>,
	Paul Menage <>,,,
	KOSAKI Motohiro <>,
	David Rientjes <>,
	Pavel Emelianov <>,
	Dhaval Giani <>,
	Balbir Singh <>,
	Rik van Riel <>,
	Andrew Morton <>,
	KAMEZAWA Hiroyuki <>
Subject: [PATCH 1/4] Memory controller soft limit documentation (v3)

Add documentation for soft limit feature support.

From: Balbir Singh <>

Signed-off-by: Balbir Singh <>

 Documentation/cgroups/memory.txt |   27 ++++++++++++++++++++++++++-
 1 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index a98a7fe..812cb74 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -360,7 +360,32 @@ cgroups created below it.
 NOTE2: This feature can be enabled/disabled per subtree.
-7. TODO
+7. Soft limits
+Soft limits allow for greater sharing of memory. The idea behind soft limits
+is to allow control groups to use as much of the memory as needed, provided
+a. There is no memory contention
+b. They do not exceed their hard limit
+When the system detects memory contention or low memory (kswapd is woken up)
+control groups are pushed back to their soft limits. If the soft limit of each
+control group is very high, they are pushed back as much as possible to make
+sure that one control group does not starve the others of memory.
+7.1 Interface
+Soft limits can be setup by using the following commands (in this example we
+assume a soft limit of 256 megabytes)
+# echo 256M > memory.soft_limit_in_bytes
+If we want to change this to 1G, we can at any time use
+# echo 1G > memory.soft_limit_in_bytes
+8. TODO
 1. Add support for accounting huge pages (as a separate controller)
 2. Make per-cgroup scanner reclaim not-shared pages first

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