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systemd: adjust CPUQuotaPerSecUSec to compensate for systemd internal handling #1651

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merged 1 commit into from Nov 16, 2017
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systemd: adjust CPUQuotaPerSecUSec to compensate for systemd internal handling #1651

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7 changes: 7 additions & 0 deletions libcontainer/cgroups/systemd/apply_systemd.go
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Expand Up @@ -271,6 +271,13 @@ func (m *Manager) Apply(pid int) error {
// cpu.cfs_quota_us and cpu.cfs_period_us are controlled by systemd.
if c.Resources.CpuQuota != 0 && c.Resources.CpuPeriod != 0 {
cpuQuotaPerSecUSec := uint64(c.Resources.CpuQuota*1000000) / c.Resources.CpuPeriod
// systemd converts CPUQuotaPerSecUSec (microseconds per CPU second) to CPUQuota
// (integer percentage of CPU) internally. This means that if a fractional percent of
// CPU is indicated by Resources.CpuQuota, we need to round up to the nearest
// 10ms (1% of a second) such that child cgroups can set the cpu.cfs_quota_us they expect.
if cpuQuotaPerSecUSec%10000 != 0 {
cpuQuotaPerSecUSec = ((cpuQuotaPerSecUSec / 10000) + 1) * 10000
}
properties = append(properties,
newProp("CPUQuotaPerSecUSec", cpuQuotaPerSecUSec))
}
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