The concepts being described are called "Furious Flushing". I believe Percona did a writeup on this as well some time ago and I had to assist a DBA with getting systems to keep up with Percona MySQL demands regarding furious flushing and adjusting filesystem and memory options. Here [1] is one of them. OS tuning options have changed a bit since 2014 and there are also more recent articles I believe. The biggest win for us was changing the servers to use SSD's and large capacitor backed raid caches.
Not as far as I know but here is a brief history. [1] They will commercially support all the databases including MariaDB. Their goal was to collectively update MySQL to take advantage of modern hardware. They are also useful for companies that have complex replication and backup requirements. They have also created a lot of tools for DBA's to manage data. The DBA's I worked with had a great relationship and great experiences with them.
[1] - https://ftp.fau.de/macports/distfiles/percona/PerconaServer-...