> On Fri, Feb 18, 2022 at 08:51:03AM +0100, Dmitrii Dolgov wrote:
> Commit 82e6b1eee6a8 ("bpf: Allow to specify user-provided bpf_cookie for
> BPF perf links") introduced the concept of user specified bpf_cookie,
> which could be accessed by BPF programs using bpf_get_attach_cookie().
> For troubleshooting purposes it is convenient to expose bpf_cookie via
> bpftool as well, so there is no need to meddle with the target BPF
> program itself.
>
> Implemented using the pid iterator BPF program to actually fetch
> bpf_cookies, which allows constraining code changes only to bpftool.
I have to admit, with pid iterator it looks a bit clumsy. Would love to
know if there is a better way.
