Do not miss also -XX:+JVMCIPrintProperties for Graal JIT options.
Before dive into sources you can skim over following extracts and find suitable option faster:
https://chriswhocodes.com/ (OracleJDK 6/7/8/9/10/11/12, OpenJDK 8/9/10/11, Graal CE/EE, OpenJ9, Zing)
http://jvm-options.tech.xebia.fr/
http://www.pingtimeout.fr/2012/05/jvm-options-complete-reference.html
http://stas-blogspot.blogspot.com/2011/07/most-complete-list-of-xx-options-for.html