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Understand JVM GC: G1 Regions, Remembered Sets, SATB Barriers

hard7/8

Use JVM Flags to Print JIT Compilation Logs Implement a Simple GC for Your Mini-JVM

Language

Compiler

2.0s Limit 256MB

Implementation

Write a C program that documents G1 GC concepts.

Requirements:

Print a diagram or list showing heap region types: Eden, Survivor, Old, Humongous
Explain what a Remembered Set (RSet) is and why each region needs one
Describe how a SATB write barrier works using a short code-like example
Explain mixed collections in one paragraph
Output must contain: G1, remembered set, SATB, and regions

Why This Matters

G1 has been the default JVM garbage collector since JDK 9 and runs in production behind most enterprise Java services, so remembered sets and SATB barriers aren't textbook abstractions — they're the exact mechanism tuning guides reference when engineers chase G1 pause-time regressions with flags like -XX:MaxGCPauseMillis. Understanding region-based collection here is also the conceptual bridge to newer low-pause collectors like ZGC and Shenandoah.

Hints

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Validation Suite

main.c

Workspace 1.0