> The kernel APIs for all this aren't really good
> though, and I always was reluctant to check for PF_KTHREAD, as that
> flag is neither documented for userspace, nor available in any
> userspace-accessible headers. However, I wanted to tighten this a bit,
> and hence we now define the flag in our own code, as it appeared to me
> otherwise there was no chance to ever make this fully robust.

PF_KTHREAD was introduced in 2.6.27 and its value appears to be stable
since then. I think it should be retroactively declared part of ABI
otherwise people will continue to rediscover that all other means do not

Empty /proc/*/exe is second best option for systemd and it's only one
system call.

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