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

# [NAME](#NAME)

probe::ioscheduler\_trace.plug - Fires when a request queue is plugged;

# [SYNOPSIS](#SYNOPSIS)

```
probe ioscheduler_trace.plug {}
```

# [VALUES](#VALUES)

*name*

Name of the probe point

*rq\_queue*

request queue

# [DESCRIPTION](#DESCRIPTION)

ie, requests in the queue cannot be serviced by block driver.

# [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.plug(3stap) from systemtap 5.6-r1 (Chainguard OS)
Source: https://sourceware.org/git/systemtap.git