make sure to log any unimplemented controllers.

src/cgroups/v2/controller_type.rs

@@ -5,6 +5,7 @@ pub enum ControllerType {
     Memory,
     HugeTlb,
     Pids,
+    Unknown(String),
 }
 
 impl ToString for ControllerType {
@@ -16,6 +17,7 @@ impl ToString for ControllerType {
             Self::Memory => "memory".into(),
             Self::HugeTlb => "hugetlb".into(),
             Self::Pids => "pids".into(),
+            Self::Unknown(tpe) => tpe.into(),
         }
     }
 }

src/cgroups/v2/manager.rs

@@ -4,7 +4,7 @@ use std::{
     path::{Path, PathBuf},
 };
 
-use anyhow::{anyhow, Result};
+use anyhow::{bail, Result};
 
 use nix::unistd::Pid;
 use oci_spec::LinuxResources;
@@ -80,10 +80,10 @@ impl Manager {
     ) -> Result<Vec<ControllerType>> {
         let controllers_path = self.root_path.join(cgroup_path).join(CGROUP_CONTROLLERS);
         if !controllers_path.exists() {
-            return Err(anyhow!(
+            bail!(
                 "cannot get available controllers. {:?} does not exist",
                 controllers_path
-            ));
+            )
         }
 
         let mut controllers = Vec::new();
@@ -95,7 +95,7 @@ impl Manager {
                 "io" => controllers.push(ControllerType::Io),
                 "memory" => controllers.push(ControllerType::Memory),
                 "pids" => controllers.push(ControllerType::Pids),
-                _ => continue,
+                tpe => controllers.push(ControllerType::Unknown(tpe.to_string())),
             }
         }
 
@@ -123,6 +123,10 @@ impl CgroupManager for Manager {
                 ControllerType::Io => Io::apply(linux_resources, &&full_cgroup_path)?,
                 ControllerType::Memory => Memory::apply(linux_resources, &full_cgroup_path)?,
                 ControllerType::Pids => Pids::apply(linux_resources, &&full_cgroup_path)?,
+                ControllerType::Unknown(tpe) => {
+                    log::warn!("Controller {} is not yet implemented.", tpe);
+                    continue;
+                }
             }
         }