Section: IO Scheduler and block IO Taps (3stap)
Updated: August 2014
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probe::ioscheduler_trace.unplug_io - Fires when a request queue is unplugged;
Name of the probe point
Either, when number of pending requests in the queue exceeds threshold or, upon expiration of timer that was activated when queue was plugged.
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Time: 23:19:55 GMT, August 08, 2014