write back cpu.max.burst after cpu.max modified in cgroup v2

If the burst is not set, we need to read the current value to write it back after `cpu.max` modified. Signed-off-by: lifubang <[email protected]>
opencontainers · Mar 15, 2024 · de4e7a4 · de4e7a4
1 parent 0773673
commit de4e7a4
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/libcontainer/cgroups/fs2/cpu.go b/libcontainer/cgroups/fs2/cpu.go
@@ -51,6 +51,15 @@ func setCpu(dirPath string, r *configs.Resources) error {
 		} else {
 			burst = ""
 		}
+	} else {
+		// If the burst is not set, we need to read the current
+		// value to write it back after `cpu.max` modified.
+		if r.CpuQuota != 0 || r.CpuPeriod != 0 {
+			burst, _ = cgroups.ReadFile(dirPath, "cpu.max.burst")
+			if burst == "0" {
+				burst = ""
+			}
+		}
 	}
 	if r.CpuQuota != 0 || r.CpuPeriod != 0 {
 		str := "max"