Green Tea GC: the insight behind Go's new garbage collector

Green Tea's insight is elegant: scan spans, not objects. But how do you actually implement that? What data structures track which objects are marked vs. scanned? Why does the ownership protocol use three states? And how did span-based scanning unlock SIMD optimizations that were impossible before?

LEVEL: Advanced

Place
Golab #1
Length
45 min
When
November 2nd, 2026
12:15

Abstract

Green Tea's insight is elegant: scan spans, not objects. But how do you actually implement that? What data structures track which objects are marked vs. scanned? Why does the ownership protocol use three states? And how did span-based scanning unlock SIMD optimizations that were impossible before?

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