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libct/cg/fs: don't write cpu_burst twice on ENOENT #4259

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Apr 27, 2024
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libct/cg/fs: don't write cpu_burst twice on ENOENT #4259

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12 changes: 6 additions & 6 deletions libcontainer/cgroups/fs/cpu.go
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Original file line number Diff line number Diff line change
Expand Up @@ -89,9 +89,11 @@ func (s *CpuGroup) Set(path string, r *configs.Resources) error {
if r.CpuBurst != nil {
burst = strconv.FormatUint(*r.CpuBurst, 10)
if err := cgroups.WriteFile(path, "cpu.cfs_burst_us", burst); err != nil {
// this is a special trick for burst feature, the current systemd and low version of kernel will not support it.
// So, an `no such file or directory` error would be raised, and we can ignore it .
if !errors.Is(err, unix.ENOENT) {
if errors.Is(err, unix.ENOENT) {
// If CPU burst knob is not available (e.g.
// older kernel), ignore it.
burst = ""
} else {
// Sometimes when the burst to be set is larger
// than the current one, it is rejected by the kernel
// (EINVAL) as old_quota/new_burst exceeds the parent
Expand All @@ -117,9 +119,7 @@ func (s *CpuGroup) Set(path string, r *configs.Resources) error {
}
if burst != "" {
if err := cgroups.WriteFile(path, "cpu.cfs_burst_us", burst); err != nil {
if !errors.Is(err, unix.ENOENT) {
return err
}
return err
}
}
}
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