systemd-analyze: Please show initrd time for initrds that do not use systemd

[bdrung]

Component

systemd-analyze

Is your feature request related to a problem? Please describe

systemd-analyze shows the time spent in the initrd in case systemd is used in the initrd. It does not show the time spent in the initrd if systemd is not used inside (e.g. when using initramfs-tools).

Describe the solution you'd like

I like to change initramfs-tools to report the needed timestamp so that systemd-analyze can report/calculate the time spent in the initrd. I haven't found documentation about it. The simplest solution would probably to store /proc/uptime somewhere in /run at the beginning of the initrd.

Describe alternatives you've considered

No response

The systemd version you checked that didn't have the feature you are asking for

255

[poettering]

frankly, an initrd without systemd is a really weird idea that might work in corner cases where you know your hw and used storage and stuff, but is really weird for the generic case. While we shouldn't explicitly break that of course I am not convinced we really should add more integration hooks for that, it's a flawed model. Any non-trivial setup will need a service manager in the initrd anyway...