ExecMainHandoverTimestamp needs fixing about systemd

[bluca]

It's about service activation tracking, so moving it to a different place is enough, which is not an API but just an internal rearrangement so no need to block rc

[poettering]

well, my think was that it actually would be nice to track this for all forked processes, and in that case it would probably have to change name

[bluca]

ExecMain timestamps are for the main processes already. It would require a new and separate exec_fd, which means there won't be a single last-thing-to-do-before-execve anymore, but two of them, which will race each other. If there's no use case for it, let's not make things more complicated for no benefit.

[poettering]

ExecMain timestamps are for the main processes already. It would require a new and separate exec_fd, which means there won't be a single last-thing-to-do-before-execve anymore, but two of them, which will race each other. If there's no use case for it, let's not make things more complicated for no benefit.

I don't see a race there? how would there be a race?

sure you have to decide what to do first, i.e. take/send the timestamp or mark the execfd as "hot", but that's fine. neither of these are "risky" or "slow" operations, hence just do one first, doesn't really matter which one you pick.