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-rw-r--r--Documentation/cgroups/memcg_test.txt20
1 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/cgroups/memcg_test.txt b/Documentation/cgroups/memcg_test.txt
index a9263596f8d..72db89ed060 100644
--- a/Documentation/cgroups/memcg_test.txt
+++ b/Documentation/cgroups/memcg_test.txt
@@ -1,5 +1,5 @@
Memory Resource Controller(Memcg) Implementation Memo.
-Last Updated: 2009/1/19
+Last Updated: 2009/1/20
Base Kernel Version: based on 2.6.29-rc2.
Because VM is getting complex (one of reasons is memcg...), memcg's behavior
@@ -360,3 +360,21 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y.
# kill malloc task.
Of course, tmpfs v.s. swapoff test should be tested, too.
+
+ 9.8 OOM-Killer
+ Out-of-memory caused by memcg's limit will kill tasks under
+ the memcg. When hierarchy is used, a task under hierarchy
+ will be killed by the kernel.
+ In this case, panic_on_oom shouldn't be invoked and tasks
+ in other groups shouldn't be killed.
+
+ It's not difficult to cause OOM under memcg as following.
+ Case A) when you can swapoff
+ #swapoff -a
+ #echo 50M > /memory.limit_in_bytes
+ run 51M of malloc
+
+ Case B) when you use mem+swap limitation.
+ #echo 50M > memory.limit_in_bytes
+ #echo 50M > memory.memsw.limit_in_bytes
+ run 51M of malloc