linux-kernel - Re: [PATCH 2/3] add new tracepoints docbook

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Date:	Wed, 29 Apr 2009 11:09:56 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Jason Baron <jbaron@...hat.com>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, rostedt@...dmis.org, fweisbec@...il.com,
	mathieu.desnoyers@...ymtl.ca, wcohen@...hat.com
Subject: Re: [PATCH 2/3] add new tracepoints docbook

Jason Baron wrote:
> Add tracepoint docbook. This will help us document and understand
> what tracepoints are in the kernel. Since there are multiple
> macros, and files that contain tracepoints.
> 
> Signed-off-by: Jason Baron <jbaron@...hat.com>
> 
> ---
>  Documentation/DocBook/Makefile        |    3 +-
>  Documentation/DocBook/tracepoint.tmpl |   84 +++++++++++++++++++++++++++++++++
>  2 files changed, 86 insertions(+), 1 deletions(-)
>  create mode 100644 Documentation/DocBook/tracepoint.tmpl
> 
> diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
> index 8918a32..4c8f4d6 100644
> --- a/Documentation/DocBook/Makefile
> +++ b/Documentation/DocBook/Makefile
> @@ -13,7 +13,8 @@ DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \
>  	    gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
>  	    genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
>  	    mac80211.xml debugobjects.xml sh.xml regulator.xml \
> -	    alsa-driver-api.xml writing-an-alsa-driver.xml
> +	    alsa-driver-api.xml writing-an-alsa-driver.xml \
> +	    tracepoint.xml
>  
>  ###
>  # The build process is as follows (targets):
> diff --git a/Documentation/DocBook/tracepoint.tmpl b/Documentation/DocBook/tracepoint.tmpl
> new file mode 100644
> index 0000000..2639a8b
> --- /dev/null
> +++ b/Documentation/DocBook/tracepoint.tmpl
> @@ -0,0 +1,84 @@
> +<?xml version="1.0" encoding="UTF-8"?>
> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
> +	"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
> +
> +<book id="Tracepoints">
> + <bookinfo>
> +  <title>The Linux Kernel Tracepoint API</title>
> +
> +  <authorgroup>
> +   <author>
> +    <firstname>Jason</firstname>
> +    <surname>Baron</surname>
> +    <affiliation>
> +     <address>
> +      <email>jbaron@...hat.com</email>
> +     </address>
> +    </affiliation>
> +   </author>
> +  </authorgroup>
> +
> +  <legalnotice>
> +   <para>
> +     This documentation is free software; you can redistribute
> +     it and/or modify it under the terms of the GNU General Public
> +     License as published by the Free Software Foundation; either
> +     version 2 of the License, or (at your option) any later
> +     version.
> +   </para>
> +
> +   <para>
> +     This program is distributed in the hope that it will be
> +     useful, but WITHOUT ANY WARRANTY; without even the implied
> +     warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> +     See the GNU General Public License for more details.
> +   </para>
> +
> +   <para>
> +     You should have received a copy of the GNU General Public
> +     License along with this program; if not, write to the Free
> +     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> +     MA 02111-1307 USA
> +   </para>
> +
> +   <para>
> +     For more details see the file COPYING in the source
> +     distribution of Linux.
> +   </para>
> +  </legalnotice>
> + </bookinfo>
> +
> + <toc></toc>
> +  <chapter id="intro">
> +   <title>Introduction</title>
> +   <para>
> +     Tracepoints are static probe points that are located in strategic points
> +     throughout the kernel. 'Probes' register/unregister with tracepoints
> +     via a callback mechanism. The 'probes' are strictly typed functions that
> +     are passed a unique set of parameters defined by each tracepoint.
> +   </para>
> +
> +   <para>
> +     From this simple callback mechanism, 'probes' can be used to profile, debug,
> +     and understand kernel behavior. There are a number of tools that provide a
> +     framework for using 'probes'. These tools include Systemtap, ftrace, and
> +     LTTng.
> +   </para>
> +
> +   <para>
> +     Tracepoints are defined in a number of header files via various macros. Thus,
> +     the purpose of this document is to provide a clear accounting of the available
> +     tracepoints. The intention is to understand not only what tracepoints are
> +     available but also to understand where future tracepoints might be added.
> +   </para>
> +
> +   <para>
> +     The api presented has functions of the form:

	    API                  please

otherwise, looks good.
Acked-by: Randy Dunlap <randy.dunlap@...cle.com>


> +     <function>trace_tracepointname(function parameters)</function>. These are the
> +     tracepoints callbacks that are found throughout the code. Registering and
> +     unregistering probes with these callback sites is covered in the
> +     <filename>Documentation/trace/*</filename> directory.
> +   </para>
> +  </chapter>
> +
> +</book>


-- 
~Randy
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