Re: [PATCHSET v2 0/3] perf stat: Enable BPF counters with --for-each-cgroup

[Peter Zijlstra]

On Mon, Jun 14, 2021 at 06:17:21PM -0700, Namhyung Kim wrote:
> Current limitations are:
>  * it doesn't support cgroup hierarchy

That seems unfortunate; there's no bpf helper to iterate cgroup
hierarchy?

>  * there's no reliable way to trigger running the BPF program

You can't attach to the PERF_COUNT_SW_CGROUP_SWITCHES event?