Erik Österlund Concurrent thread stack processing in the Z Garbage Collector

The Z Garbage Collector (ZGC) goal was to not exceed 10 ms pause times. Once Oracle got there, they wanted to be more ambitious and make pauses submillisecond. To do that, you can no longer scan thread stacks inside of GC pauses. This talk is about JEP 376: ZGC: Concurrent threadstack processing, where we moved this processing out to concurrent phases instead, to achieve the low latency GC dream.