MariaDB misses 3 tables in P_S compared to MySQL
The most important is host_cache.
And the less important.
session_account_connect_attrs
and
session_connect_attrs
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For the record, that's exactly what 10.0.0 release notes say (https://kb.askmonty.org/en/mariadb-1000-release-notes/):
"Performance schema — from MySQL 5.6.5 (without host cache)"
I believe the other two tables were added later, in 5.6.6 or so.