backport of commit 76e419a

hashicorp · Jun 21, 2023 · fd8eb68 · fd8eb68
1 parent c18f381
commit fd8eb68
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/client/lib/cgutil/cgutil_linux.go b/client/lib/cgutil/cgutil_linux.go
@@ -159,9 +159,11 @@ func MaybeDisableMemorySwappiness() *uint64 {
 		return zero
 	}
 
-	// cgroups v1 check if the root and swappiness interface exist
-	_, err := os.Stat("/sys/fs/cgroup/memory/memory.swappiness")
-	if os.IsNotExist(err) {
+	// cgroups v1 detect if swappiness is supported by attempting to write to
+	// the nomad parent cgroup swappiness interface
+	e := &editor{fromRoot: "memory/nomad"}
+	err := e.write("memory.swappiness", "0")
+	if err != nil {
 		return bypass
 	}