[hostcfgd] [202012] Enhance hostcfgd to check feature state and run less system calls #8157
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…cuting a system call. Adapt the unit tests to the new change. Add another UT to verify daemon behavior when no system calls are required. Signed-off-by: Shlomi Bitton <[email protected]>
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@yxieca can you please check the warm_boot test failure? It does not seems to be related to this change. |
The real failure here is the exceeded downtime: The I have triggered a re-run and this should likely pass. |
lguohan
approved these changes
Jul 13, 2021
5 tasks
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Signed-off-by: Shlomi Bitton [email protected]
Why I did it
Currently hostcfgd is implemented in a way each feature which is enabled/disabled triggering execution of systemctl enable/unmask commands which eventually trigger 'systemctl daemon-reload' command.
Each call like this cost 0.6s and overall add a overhead of ~12 seconds of CPU time.
This change will verify the desired state of a feature and the current state of this feature on systemd and trigger a system call only when must.
How I did it
Check each feature status on systemd before executing a system call to enable and reload the systemctl daemon.
How to verify it
Build an image with this change and observe less system calls are executed.
Which release branch to backport (provide reason below if selected)
Description for the changelog
A picture of a cute animal (not mandatory but encouraged)