add disable oom_control function

Signed-off-by: bin liu <bin@hyper.sh>

tests/memory.rs

@@ -0,0 +1,29 @@
+//! Integration tests about the hugetlb subsystem
+use cgroups::memory::MemController;
+use cgroups::Cgroup;
+use cgroups::Controller;
+
+use cgroups::error::ErrorKind::*;
+use cgroups::error::*;
+
+#[test]
+fn test_disable_oom_killer() {
+    let hier = cgroups::hierarchies::V1::new();
+    let cg = Cgroup::new(&hier, String::from("test_disable_oom_killer"));
+    {
+        let mem_controller: &MemController = cg.controller_of().unwrap();
+
+        // before disable
+        let m = mem_controller.memory_stat();
+        assert_eq!(m.oom_control.oom_kill_disable, false);
+
+        // disable oom killer
+        let r = mem_controller.disable_oom_killer();
+        assert_eq!(r.is_err(), false);
+
+        // after disable
+        let m = mem_controller.memory_stat();
+        assert_eq!(m.oom_control.oom_kill_disable, true);
+    }
+    cg.delete();
+}