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This document was automatically translated by hunyuan-turbos-latest model, for reference only.

• Source document: kernel/interrupt/tasklet.md

• Translation time: 2026-01-09 06:34:08

• Translation model: hunyuan-turbos-latest

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Tasklet

A tasklet is a bottom-half mechanism based on softirq, used to execute lightweight, non-sleepable callback logic within a softirq context.

Semantic Highlights

• Can be scheduled in hardirq/softirq/task context.

• Only one instance of the same tasklet can execute at a time (self-serializing).

• Repeated scheduling is deduplicated and will not enqueue indefinitely.

• Callbacks run in a softirq context, where sleeping is not allowed.

Data Passing

The tasklet callback is abstracted through the TaskletFunc trait, with an equivalent function signature:

fn(usize, Option<Arc<dyn TaskletData>>)

• usize is suitable for simple values or indices.

• Option<Arc<dyn TaskletData>> is suitable for complex data that requires safe sharing.

TaskletData is constrained to Send + Sync, and is safely shared via Arc to avoid passing raw pointers.