040000 tree 28ed8a56186488202472c6e3327953d661fc8a32	concurrentMarkSweep
040000 tree 1b5bf0d5909ce869e4f619b7f0096e6987f1ff96	g1
040000 tree 0b7bcfe0fd0a785cfe2c4f08ae204676845a8983	parNew
040000 tree 9964868d06280af247fc2a6244ba72c2d256d98c	parallelScavenge
040000 tree f159705782472435455dd1a03eb59e5e15aaf060	shared