On Mon, Sep 23, 2024 at 12:33 PM <Dharma.B@xxxxxxxxxxxxx> wrote:
Hi Team,
I'm exploring the possibility of splitting the systemd binary to
optimize boot time before and after switching to the root filesystem.
I’m aware that the systemd binary is quite large and may not fit in the
initramfs, but is it feasible to have a minimal version of systemd that
can invoke essential services and continue tracking them after
transitioning to the main root filesystem?
Unless I missed any recent changes, transitioning to the main root filesystem always involves launching the main systemd executable anew from rootfs (even if the initramfs was already running systemd). It's fine if a minimal initramfs-systemd execs a larger rootfs-systemd during the transition as long as their versions are compatible – though I am not sure if there is actually any state handed over between them in the first place; IIRC normally none of the initramfs services are expected to survive the transition.
--
Mantas Mikulėnas
