How G1 actually works: uniform regions and the ergonomic sizing formula, remembered sets and the card table with its write barrier, SATB and the pre-write barrier, the phases of an evacuation pause, humongous allocation and why it bypasses the young generation, and how the collection set is chosen for a mixed collection. Use when a pause is longer than the live-set size explains, when `Merge Heap Roots` or `Merge RS` dominates `-Xlog:gc+phases`, when legacy `To-space exhausted` or current `Evacuation Failure` appears, when the old generation grows without the application retaining anything, when `Humongous regions` climbs in the log, when someone sets `-Xmn` under G1, or …
