1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>The Linux Kernel Tracepoint API</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel Tracepoint API"><link rel="next" href="intro.html" title="Chapter 1. Introduction"></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">The Linux Kernel Tracepoint API</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="intro.html">Next</a></td></tr></table><hr></div><div class="book"><div class="titlepage"><div><div><h1 class="title"><a name="Tracepoints"></a>The Linux Kernel Tracepoint API</h1></div><div><div class="authorgroup"><div class="author"><h3 class="author"><span class="firstname">Jason</span> <span class="surname">Baron</span></h3><div class="affiliation"><div class="address"><p><br> 2      <code class="email"><<a class="email" href="mailto:jbaron@redhat.com">jbaron@redhat.com</a>></code><br> 3     </p></div></div></div><div class="author"><h3 class="author"><span class="firstname">William</span> <span class="surname">Cohen</span></h3><div class="affiliation"><div class="address"><p><br> 4      <code class="email"><<a class="email" href="mailto:wcohen@redhat.com">wcohen@redhat.com</a>></code><br> 5     </p></div></div></div></div></div><div><div class="legalnotice"><a name="idp1119786724"></a><p> 6 This documentation is free software; you can redistribute 7 it and/or modify it under the terms of the GNU General Public 8 License as published by the Free Software Foundation; either 9 version 2 of the License, or (at your option) any later 10 version. 11 </p><p> 12 This program is distributed in the hope that it will be 13 useful, but WITHOUT ANY WARRANTY; without even the implied 14 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 15 See the GNU General Public License for more details. 16 </p><p> 17 You should have received a copy of the GNU General Public 18 License along with this program; if not, write to the Free 19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, 20 MA 02111-1307 USA 21 </p><p> 22 For more details see the file COPYING in the source 23 distribution of Linux. 24 </p></div></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="chapter"><a href="intro.html">1. Introduction</a></span></dt><dt><span class="chapter"><a href="irq.html">2. IRQ</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="API-trace-irq-handler-entry.html"><span class="phrase">trace_irq_handler_entry</span></a></span><span class="refpurpose"> — 25 called immediately before the irq action handler 26 </span></dt><dt><span class="refentrytitle"><a href="API-trace-irq-handler-exit.html"><span class="phrase">trace_irq_handler_exit</span></a></span><span class="refpurpose"> — 27 called immediately after the irq action handler returns 28 </span></dt><dt><span class="refentrytitle"><a href="API-trace-softirq-entry.html"><span class="phrase">trace_softirq_entry</span></a></span><span class="refpurpose"> — 29 called immediately before the softirq handler 30 </span></dt><dt><span class="refentrytitle"><a href="API-trace-softirq-exit.html"><span class="phrase">trace_softirq_exit</span></a></span><span class="refpurpose"> — 31 called immediately after the softirq handler returns 32 </span></dt><dt><span class="refentrytitle"><a href="API-trace-softirq-raise.html"><span class="phrase">trace_softirq_raise</span></a></span><span class="refpurpose"> — 33 called immediately when a softirq is raised 34 </span></dt></dl></dd><dt><span class="chapter"><a href="signal.html">3. SIGNAL</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="API-trace-signal-generate.html"><span class="phrase">trace_signal_generate</span></a></span><span class="refpurpose"> — 35 called when a signal is generated 36 </span></dt><dt><span class="refentrytitle"><a href="API-trace-signal-deliver.html"><span class="phrase">trace_signal_deliver</span></a></span><span class="refpurpose"> — 37 called when a signal is delivered 38 </span></dt></dl></dd><dt><span class="chapter"><a href="block.html">4. Block IO</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="API-trace-block-touch-buffer.html"><span class="phrase">trace_block_touch_buffer</span></a></span><span class="refpurpose"> — 39 mark a buffer accessed 40 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-dirty-buffer.html"><span class="phrase">trace_block_dirty_buffer</span></a></span><span class="refpurpose"> — 41 mark a buffer dirty 42 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-rq-abort.html"><span class="phrase">trace_block_rq_abort</span></a></span><span class="refpurpose"> — 43 abort block operation request 44 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-rq-requeue.html"><span class="phrase">trace_block_rq_requeue</span></a></span><span class="refpurpose"> — 45 place block IO request back on a queue 46 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-rq-complete.html"><span class="phrase">trace_block_rq_complete</span></a></span><span class="refpurpose"> — 47 block IO operation completed by device driver 48 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-rq-insert.html"><span class="phrase">trace_block_rq_insert</span></a></span><span class="refpurpose"> — 49 insert block operation request into queue 50 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-rq-issue.html"><span class="phrase">trace_block_rq_issue</span></a></span><span class="refpurpose"> — 51 issue pending block IO request operation to device driver 52 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-bio-bounce.html"><span class="phrase">trace_block_bio_bounce</span></a></span><span class="refpurpose"> — 53 used bounce buffer when processing block operation 54 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-bio-complete.html"><span class="phrase">trace_block_bio_complete</span></a></span><span class="refpurpose"> — 55 completed all work on the block operation 56 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-bio-backmerge.html"><span class="phrase">trace_block_bio_backmerge</span></a></span><span class="refpurpose"> — 57 merging block operation to the end of an existing operation 58 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-bio-frontmerge.html"><span class="phrase">trace_block_bio_frontmerge</span></a></span><span class="refpurpose"> — 59 merging block operation to the beginning of an existing operation 60 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-bio-queue.html"><span class="phrase">trace_block_bio_queue</span></a></span><span class="refpurpose"> — 61 putting new block IO operation in queue 62 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-getrq.html"><span class="phrase">trace_block_getrq</span></a></span><span class="refpurpose"> — 63 get a free request entry in queue for block IO operations 64 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-sleeprq.html"><span class="phrase">trace_block_sleeprq</span></a></span><span class="refpurpose"> — 65 waiting to get a free request entry in queue for block IO operation 66 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-plug.html"><span class="phrase">trace_block_plug</span></a></span><span class="refpurpose"> — 67 keep operations requests in request queue 68 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-unplug.html"><span class="phrase">trace_block_unplug</span></a></span><span class="refpurpose"> — 69 release of operations requests in request queue 70 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-split.html"><span class="phrase">trace_block_split</span></a></span><span class="refpurpose"> — 71 split a single bio struct into two bio structs 72 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-bio-remap.html"><span class="phrase">trace_block_bio_remap</span></a></span><span class="refpurpose"> — 73 map request for a logical device to the raw device 74 </span></dt><dt><span class="refentrytitle"><a href="API-trace-block-rq-remap.html"><span class="phrase">trace_block_rq_remap</span></a></span><span class="refpurpose"> — 75 map request for a block operation request 76 </span></dt></dl></dd><dt><span class="chapter"><a href="workqueue.html">5. Workqueue</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="API-trace-workqueue-queue-work.html"><span class="phrase">trace_workqueue_queue_work</span></a></span><span class="refpurpose"> — 77 called when a work gets queued 78 </span></dt><dt><span class="refentrytitle"><a href="API-trace-workqueue-activate-work.html"><span class="phrase">trace_workqueue_activate_work</span></a></span><span class="refpurpose"> — 79 called when a work gets activated 80 </span></dt><dt><span class="refentrytitle"><a href="API-trace-workqueue-execute-start.html"><span class="phrase">trace_workqueue_execute_start</span></a></span><span class="refpurpose"> — 81 called immediately before the workqueue callback 82 </span></dt><dt><span class="refentrytitle"><a href="API-trace-workqueue-execute-end.html"><span class="phrase">trace_workqueue_execute_end</span></a></span><span class="refpurpose"> — 83 called immediately after the workqueue callback 84 </span></dt></dl></dd></dl></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="intro.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"> </td><td width="40%" align="right" valign="top"> Chapter 1. Introduction</td></tr></table></div></body></html> 85