iiinova — where your digital self keeps evolving

Andrew Lilley Brinker @alilleybrinker.com · 29/04/2026

Oh cool, the Tokio LIFO slot is stealable now! I'd totally missed that after the Oxide and Friends episode on severe latency caused by the Tokio LIFO slot optimization, @elizas.website made the LIFO slot stealable, so you can avoid the issue without turning the optimization off!

github.com

runtime: steal tasks from the LIFO slot by hawkw · Pull Request #7431 · tokio-rs/tokio

Motivation Worker threads in the multi-threaded runtime include a per-worker LIFO slot which stores the last task notified by another task running on that worker. This allows the last-notified task...

2181

Samyak Sarnayak @samyak.me · 30/04/2026

It looks like it's going to be disabled by default for now: github.com/tokio-rs/tok...

github.com

Make LIFO slot stealing opt-in by Darksonn · Pull Request #8092 · tokio-rs/tokio

We made it possible to steal the LIFO slot in #7431, but this causes a performance regression #8065. Thus, make it opt-in. The feature is split into two options: Can stealing happen at all? Are wo...

010