memory and garbage collection

allocation, reachability, and every collector from Serial to generational ZGC.

1. 01the JVM's memory mapheap, stacks, metaspace, code cache. what lives where.
2. 02allocation and TLABsnew is usually just a pointer bump. here's why it's so fast.
3. 03reachabilityGC roots, and soft, weak and phantom references.
4. 04how garbage collection worksmark, sweep, compact, copy. and tri-color marking.
5. 05generational collectionmost objects die young. eden, survivors, and the old generation.
6. 06serial and parallelthe stop-the-world collectors, and when they're still the right call.
7. 07G1regions, remembered sets, mixed collections. the default collector.
8. 08ZGCcolored pointers and load barriers. sub-millisecond pauses.
9. 09Shenandoahconcurrent compaction with forwarding pointers.
10. 10choosing a collectorthroughput, latency, footprint. pick two.
11. 11reading GC logs-Xlog:gc and what all those numbers mean.
12. 12memory leaksyes, java leaks. heap dumps, dominators, and the usual suspects.
13. 13native memorythe memory the heap doesn't count. NMT and direct buffers.