[HN] Linux 6.6 Enables Tracking Per-CPU Cgroup CPU Usage Stats

This is the best summary I could come up with:

With the new cgroup code in Linux 6.6, the per-CPU CPU usage stats are now being tracked.

As noted in last week's cgroup merge to Linux 6.6 Git, the per-CPU CPU usage stats are being tracked now and can be exposed such as via eBPF but not currently exposed via the cgroupfs interface.

In a future kernel release the per-CPU usage stats will hopefully be exposed via cgroupfs once an adequate interface has been agreed upon.

This will cause the cumulative value to be non-monotonic, thus affecting the accuracy of cgroup per-cpu usage.

After adding this variable, we can obtain the per-cpu time of cgroup and its descendants in user mode through eBPF, etc."

This cgroup contribution to the upstream kernel was carried out by Bytedance engineers.

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