Profiling systemd for arm 64 build

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Hi all 

What I am trying to is to profile systemd with different optimizations level viz (-O1,-O2,-O3). What I have done so far is build systemd with different optimization levels and replace the build in a bare minimum linux distro ; after which I boot the same up in qemu to a shell prompt and run 

systemd-analyze plot to compare between boot times of different components.

Is there a better way to do this?  Any help would be appreciated.

Regards
Anilava

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