Merge pull request #3374 from giuseppe/cgroups

cgroups: add initial support for cgroups v2

1 files changed, 27 insertions, 0 deletions

diff --git a/pkg/cgroups/cgroups_supported.go b/pkg/cgroups/cgroups_supported.go
new file mode 100644
index 000000000..fcd44dfc8
--- /dev/null
+++ b/pkg/cgroups/cgroups_supported.go
@@ -0,0 +1,27 @@
+// +build linux
+
+package cgroups
+
+import (
+	"sync"
+	"syscall"
+)
+
+var (
+	isUnifiedOnce sync.Once
+	isUnified     bool
+	isUnifiedErr  error
+)
+
+// IsCgroup2UnifiedMode returns whether we are running in cgroup 2 cgroup2 mode.
+func IsCgroup2UnifiedMode() (bool, error) {
+	isUnifiedOnce.Do(func() {
+		var st syscall.Statfs_t
+		if err := syscall.Statfs("/sys/fs/cgroup", &st); err != nil {
+			isUnified, isUnifiedErr = false, err
+		} else {
+			isUnified, isUnifiedErr = st.Type == _cgroup2SuperMagic, nil
+		}
+	})
+	return isUnified, isUnifiedErr
+}