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libctr: Reset the inherited cpu affinity #4041

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libctr: Reset the inherited cpu affinity #4041

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16 changes: 16 additions & 0 deletions libcontainer/process_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,14 @@ func (p *setnsProcess) start() (retErr error) {
}
}
}
// Reset the inherited cpu affinity. Old kernels do that automatically, but
// new kernels remember the affinity that was set before the cgroup move.
// This is undesirable, because it inherits the systemd affinity when the container
// should really move to the container space cpus.
if err := unix.SchedSetaffinity(p.pid(), &unix.CPUSet{}); err != nil && err != unix.EINVAL && err != unix.ENODEV {
return fmt.Errorf("error resetting pid %d affinity: %w", p.pid(), err)
}

if p.intelRdtPath != "" {
// if Intel RDT "resource control" filesystem path exists
_, err := os.Stat(p.intelRdtPath)
Expand Down Expand Up @@ -419,6 +427,14 @@ func (p *initProcess) start() (retErr error) {
if err := p.manager.Apply(p.pid()); err != nil {
return fmt.Errorf("unable to apply cgroup configuration: %w", err)
}

// Reset the inherited cpu affinity. Old kernels do that automatically, but
// new kernels remember the affinity that was set before the cgroup move.
// This is undesirable, because it inherits the systemd affinity when the container
// should really move to the container space cpus.
if err := unix.SchedSetaffinity(p.pid(), &unix.CPUSet{}); err != nil && err != unix.EINVAL && err != unix.ENODEV {
return fmt.Errorf("error resetting pid %d affinity: %w", p.pid(), err)
}
if p.intelRdtManager != nil {
if err := p.intelRdtManager.Apply(p.pid()); err != nil {
return fmt.Errorf("unable to apply Intel RDT configuration: %w", err)
Expand Down