695: New method for managing THP

[rhysmeister]

SUMMARY

New method for managing THP. MongoDB 8 comes with a recommendation to turn thp on now.

TODO:

• Should add tests for this.
• Add a warning to release notes to cleanup old systemd service (/etc/systemd/system/disable-transparent-huge-pages.service) if appropriate.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

mongodb_linux

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.44%. Comparing base (8d0b4d7) to head (3fb368b).

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #697     +/-   ##
=========================================
  Coverage   73.44%   73.44%             
=========================================
  Files          18        6     -12     
  Lines        2802      934   -1868     
  Branches      429      143    -286     
=========================================
- Hits         2058      686   -1372     
+ Misses        630      210    -420     
+ Partials      114       38     -76     

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[kroeschl]

I think we still need to support disabling transparent huge pages for MongoDB 7.0.

[rhysmeister]

Yes, that's still in place. The role should create the appropriate systemd service, to enable or disable thp, according to the value of mongodb_enable_thp.

[kroeschl]

Oops yep, I glanced at this and thought it was replacing the existing service. My bad!

[kroeschl]

I'm not sure if this was intentional, but this unit is quite different from the example provided in the MongoDB docs.