is there any resource about gc details of hotspot?

[Li Li]

hi all,
    I'd like to learn the detail of each garbage collector such as
Serial GC, Parallel GC, G1 GC. the basic idea of these algorithm(I
don't want to read the codes of open jdk now because it's hard to
understand). such as how they do marking and sweeping, why some of
them need stopping the world while others can run concurrently with
java application.
    http://www.oracle.com/technetwork/java/javase/tech/index-jsp-140228.html
is the official document. but I need something more detailed. thank
you.
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