[systemd-bugs] [Bug 72611] systemctl is-enabled scales poorly with many units

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72611

--- Comment #7 from David Strauss <david at davidstrauss.net> ---
Okay, so I think I understand the issue now. If you have a ton of units, and
they're mostly enabled, checking is-enabled scales O(2*n).

Here's the problematic path in our case, with units in /etc/systemd/system:
 (1) find_symlinks_fd() iterates through everything in /etc/systemd/system
 (2) When we find the multi-user.target.wants directory, we recursively call
find_symlinks_fd() on it.
 (3) We look for symlinks back to the unit.

This isn't at all unique to recent systemd versions; it's just a new problem
we're seeing with our increasing scale.

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