GGGGCCCC

G1

http://hg.openjdk.java.net/jdk9/jdk9/hotspot/file/b756e7a2ec33/src/share/vm/gc/g1/

write barrier or store check

http://www.cs.ucsb.edu/~urs/oocsb/papers/write-barrier.pdf

Older-first Garbage Collection in Practice:Evaluation in a Java Virtual Machine

http://www.cs.utexas.edu/users/speedway/DaCapo/papers/of-msp-2002.pdf