113 lines
3.3 KiB
Cheetah
113 lines
3.3 KiB
Cheetah
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
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<book id="Tracepoints">
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<bookinfo>
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<title>The Linux Kernel Tracepoint API</title>
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<authorgroup>
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<author>
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<firstname>Jason</firstname>
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<surname>Baron</surname>
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<affiliation>
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<address>
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<email>jbaron@redhat.com</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>William</firstname>
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<surname>Cohen</surname>
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<affiliation>
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<address>
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<email>wcohen@redhat.com</email>
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</address>
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</affiliation>
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</author>
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</authorgroup>
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<legalnotice>
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<para>
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This documentation is free software; you can redistribute
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it and/or modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later
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version.
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</para>
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<para>
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This program is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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</para>
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<para>
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You should have received a copy of the GNU General Public
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License along with this program; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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MA 02111-1307 USA
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</para>
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<para>
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For more details see the file COPYING in the source
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distribution of Linux.
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</para>
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</legalnotice>
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</bookinfo>
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<toc></toc>
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<chapter id="intro">
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<title>Introduction</title>
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<para>
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Tracepoints are static probe points that are located in strategic points
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throughout the kernel. 'Probes' register/unregister with tracepoints
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via a callback mechanism. The 'probes' are strictly typed functions that
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are passed a unique set of parameters defined by each tracepoint.
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</para>
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<para>
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From this simple callback mechanism, 'probes' can be used to profile, debug,
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and understand kernel behavior. There are a number of tools that provide a
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framework for using 'probes'. These tools include Systemtap, ftrace, and
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LTTng.
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</para>
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<para>
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Tracepoints are defined in a number of header files via various macros. Thus,
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the purpose of this document is to provide a clear accounting of the available
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tracepoints. The intention is to understand not only what tracepoints are
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available but also to understand where future tracepoints might be added.
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</para>
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<para>
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The API presented has functions of the form:
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<function>trace_tracepointname(function parameters)</function>. These are the
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tracepoints callbacks that are found throughout the code. Registering and
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unregistering probes with these callback sites is covered in the
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<filename>Documentation/trace/*</filename> directory.
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</para>
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</chapter>
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<chapter id="irq">
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<title>IRQ</title>
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!Iinclude/trace/events/irq.h
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</chapter>
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<chapter id="signal">
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<title>SIGNAL</title>
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!Iinclude/trace/events/signal.h
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</chapter>
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<chapter id="block">
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<title>Block IO</title>
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!Iinclude/trace/events/block.h
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</chapter>
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<chapter id="workqueue">
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<title>Workqueue</title>
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!Iinclude/trace/events/workqueue.h
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</chapter>
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</book>
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