PROBE::IOSCHEDULER\_T(3stap) IO Scheduler and block IO Taps PROBE::IOSCHEDULER\_T(3stap)

# [NAME](#NAME)

probe::ioscheduler\_trace.unplug\_io - Fires when a request queue is unplugged;

# [SYNOPSIS](#SYNOPSIS)

```
probe ioscheduler_trace.unplug_io {}
```

# [VALUES](#VALUES)

*rq\_queue*

request queue

*name*

Name of the probe point

# [DESCRIPTION](#DESCRIPTION)

Either, when number of pending requests in the queue exceeds threshold or, upon expiration of timer that was activated when queue was plugged.

# [SEE ALSO0](#SEE_ALSO0)

[*tapset::ioscheduler*(3stap)](/man/enterprise-packages/systemtap/tapset::ioscheduler.3stap)

September 2026 SystemTap Tapset Reference Ver

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Document: probe::ioscheduler_trace.unplug_io(3stap) from systemtap 5.6-r0 (Chainguard OS)
Source: https://sourceware.org/git/systemtap.git