Documentation/DocBook/tracepoint.tmpl

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
   3         "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
   4
   5 <book id="Tracepoints">
   6  <bookinfo>
   7   <title>The Linux Kernel Tracepoint API</title>
   8
   9   <authorgroup>
  10    <author>
  11     <firstname>Jason</firstname>
  12     <surname>Baron</surname>
  13     <affiliation>
  14      <address>
  15       <email>jbaron@redhat.com</email>
  16      </address>
  17     </affiliation>
  18    </author>
  19    <author>
  20     <firstname>William</firstname>
  21     <surname>Cohen</surname>
  22     <affiliation>
  23      <address>
  24       <email>wcohen@redhat.com</email>
  25      </address>
  26     </affiliation>
  27    </author>
  28   </authorgroup>
  29
  30   <legalnotice>
  31    <para>
  32      This documentation is free software; you can redistribute
  33      it and/or modify it under the terms of the GNU General Public
  34      License as published by the Free Software Foundation; either
  35      version 2 of the License, or (at your option) any later
  36      version.
  37    </para>
  38
  39    <para>
  40      This program is distributed in the hope that it will be
  41      useful, but WITHOUT ANY WARRANTY; without even the implied
  42      warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  43      See the GNU General Public License for more details.
  44    </para>
  45
  46    <para>
  47      You should have received a copy of the GNU General Public
  48      License along with this program; if not, write to the Free
  49      Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  50      MA 02111-1307 USA
  51    </para>
  52
  53    <para>
  54      For more details see the file COPYING in the source
  55      distribution of Linux.
  56    </para>
  57   </legalnotice>
  58  </bookinfo>
  59
  60  <toc></toc>
  61   <chapter id="intro">
  62    <title>Introduction</title>
  63    <para>
  64      Tracepoints are static probe points that are located in strategic points
  65      throughout the kernel. 'Probes' register/unregister with tracepoints
  66      via a callback mechanism. The 'probes' are strictly typed functions that
  67      are passed a unique set of parameters defined by each tracepoint.
  68    </para>
  69
  70    <para>
  71      From this simple callback mechanism, 'probes' can be used to profile, debug,
  72      and understand kernel behavior. There are a number of tools that provide a
  73      framework for using 'probes'. These tools include Systemtap, ftrace, and
  74      LTTng.
  75    </para>
  76
  77    <para>
  78      Tracepoints are defined in a number of header files via various macros. Thus,
  79      the purpose of this document is to provide a clear accounting of the available
  80      tracepoints. The intention is to understand not only what tracepoints are
  81      available but also to understand where future tracepoints might be added.
  82    </para>
  83
  84    <para>
  85      The API presented has functions of the form:
  86      <function>trace_tracepointname(function parameters)</function>. These are the
  87      tracepoints callbacks that are found throughout the code. Registering and
  88      unregistering probes with these callback sites is covered in the
  89      <filename>Documentation/trace/*</filename> directory.
  90    </para>
  91   </chapter>
  92
  93   <chapter id="irq">
  94    <title>IRQ</title>
  95 !Iinclude/trace/events/irq.h
  96   </chapter>
  97
  98   <chapter id="signal">
  99    <title>SIGNAL</title>
 100 !Iinclude/trace/events/signal.h
 101   </chapter>
 102
 103   <chapter id="block">
 104    <title>Block IO</title>
 105 !Iinclude/trace/events/block.h
 106   </chapter>
 107
 108   <chapter id="workqueue">
 109    <title>Workqueue</title>
 110 !Iinclude/trace/events/workqueue.h
 111   </chapter>
 112 </book>