books
http://gchandbook.org/
https://www.cs.kent.ac.uk/people/staff/rej/gcbib/gcbib.pdf

2019
https://shipilev.net/jvm/diy-gc/
    https://habr.com/ru/company/jugru/blog/443250/
2018
https://www.opsian.com/blog/javas-new-zgc-is-very-exciting/
https://jaxenter.com/jep-333-zgc-targeted-jdk-11-145414.html
https://www.youtube.com/watch?v=tShc0dyFtgw

qa
http://stackoverflow.com/questions/895444/java-garbage-collection-log-messages