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Description of problem:
In general, drop-in configuration files should be used whenever possible.  This reduces the contention and a need for locks when two or more processes are trying to write to a shared configuration file.  The tuned daemon's [scheduler] plugin writes settings (CPUAffinity) into /etc/systemd/system.conf.  I suggest creating something like /etc/systemd/system.conf.d/50-tuned.conf instead.

Version-Release number of selected component (if applicable):
All

How reproducible:
Always

Steps to Reproduce:
1. Use tuned's [scheduler] plugin or look in the tuned's current code.

Actual results:
/etc/systemd/system.conf modified.

Expected results:
A configuration file in /etc/systemd/system.conf.d/ written.

Additional info:
This is mostly a problem when running containerized tuned on RHCOS, where there are limited number of modifications a container can do on the host without causing potential issues.

Cloned to RHEL-8 as bug 1788195.

Red Hat Enterprise Linux version 7 entered the Maintenance Support 1 phase in August 2019. In this phase only qualified Critical and Important Security errata advisories (RHSAs) and Urgent Priority Bug Fix errata advisories (RHBAs) may be released as they become available. Other errata advisories may be delivered as appropriate.

This bug has been reviewed by Support and Engineering representative and does not meet the inclusion criteria for Maintenance Support 1 phase.

For more information about Red Hat Enterprise Linux Lifecycle, please see https://access.redhat.com/support/policy/updates/errata#Maintenance_Support_1_Phase.

Development Management has reviewed and declined this request. You may appeal this decision by using your Red Hat support channels, who will make certain  the issue receives the proper prioritization with product and development management.

https://www.redhat.com/support/process/production/#howto