<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Chapter 9. IO Scheduler and block IO Tapset</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1"><link rel="start" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="up" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="prev" href="re174.html" title="probe::scheduler.wakeup_new"><link rel="next" href="re175.html" title="probe::ioblock.end"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 9. IO Scheduler and block IO Tapset</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re174.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="re175.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="iosched.stp"></a>Chapter 9. IO Scheduler and block IO Tapset</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="refentrytitle"><a href="re175.html"><span>probe::ioblock.end</span></a></span><span class="refpurpose"> - Fires whenever a block I/O transfer is complete. </span></dt><dt><span class="refentrytitle"><a href="re176.html"><span>probe::ioblock.request</span></a></span><span class="refpurpose"> - Fires whenever making a generic block I/O request. </span></dt><dt><span class="refentrytitle"><a href="re177.html"><span>probe::ioblock_trace.bounce</span></a></span><span class="refpurpose"> - Fires whenever a buffer bounce is needed for at least one page of a block IO request. </span></dt><dt><span class="refentrytitle"><a href="re178.html"><span>probe::ioblock_trace.end</span></a></span><span class="refpurpose"> - Fires whenever a block I/O transfer is complete. </span></dt><dt><span class="refentrytitle"><a href="re179.html"><span>probe::ioblock_trace.request</span></a></span><span class="refpurpose"> - Fires just as a generic block I/O request is created for a bio. </span></dt><dt><span class="refentrytitle"><a href="re180.html"><span>probe::ioscheduler.elv_add_request</span></a></span><span class="refpurpose"> - probe to indicate request is added to the request queue. </span></dt><dt><span class="refentrytitle"><a href="re181.html"><span>probe::ioscheduler.elv_add_request.kp</span></a></span><span class="refpurpose"> - kprobe based probe to indicate that a request was added to the request queue </span></dt><dt><span class="refentrytitle"><a href="re182.html"><span>probe::ioscheduler.elv_add_request.tp</span></a></span><span class="refpurpose"> - tracepoint based probe to indicate a request is added to the request queue. </span></dt><dt><span class="refentrytitle"><a href="re183.html"><span>probe::ioscheduler.elv_completed_request</span></a></span><span class="refpurpose"> - Fires when a request is completed </span></dt><dt><span class="refentrytitle"><a href="re184.html"><span>probe::ioscheduler.elv_next_request</span></a></span><span class="refpurpose"> - Fires when a request is retrieved from the request queue </span></dt><dt><span class="refentrytitle"><a href="re185.html"><span>probe::ioscheduler.elv_next_request.return</span></a></span><span class="refpurpose"> - Fires when a request retrieval issues a return signal </span></dt><dt><span class="refentrytitle"><a href="re186.html"><span>probe::ioscheduler_trace.elv_abort_request</span></a></span><span class="refpurpose"> - Fires when a request is aborted. </span></dt><dt><span class="refentrytitle"><a href="re187.html"><span>probe::ioscheduler_trace.elv_completed_request</span></a></span><span class="refpurpose"> - Fires when a request is </span></dt><dt><span class="refentrytitle"><a href="re188.html"><span>probe::ioscheduler_trace.elv_issue_request</span></a></span><span class="refpurpose"> - Fires when a request is </span></dt><dt><span class="refentrytitle"><a href="re189.html"><span>probe::ioscheduler_trace.elv_requeue_request</span></a></span><span class="refpurpose"> - Fires when a request is </span></dt><dt><span class="refentrytitle"><a href="re190.html"><span>probe::ioscheduler_trace.plug</span></a></span><span class="refpurpose"> - Fires when a request queue is plugged; </span></dt><dt><span class="refentrytitle"><a href="re191.html"><span>probe::ioscheduler_trace.unplug_io</span></a></span><span class="refpurpose"> - Fires when a request queue is unplugged; </span></dt><dt><span class="refentrytitle"><a href="re192.html"><span>probe::ioscheduler_trace.unplug_timer</span></a></span><span class="refpurpose"> - Fires when unplug timer associated </span></dt></dl></div><p> This family of probe points is used to probe block IO layer and IO scheduler activities. It contains the following probe points: </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re174.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="re175.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>probe::scheduler.wakeup_new</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>probe::ioblock.end</span></td></tr></table></div></body></html>