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-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
-[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
-<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
-
-<chapter id='profile-manual-intro'>
-
-<title>Yocto Project Profiling and Tracing Manual</title>
- <section id='profile-intro'>
- <title>Introduction</title>
-
- <para>
- Yocto bundles a number of tracing and profiling tools - this 'HOWTO'
- describes their basic usage and shows by example how to make use
- of them to examine application and system behavior.
- </para>
-
- <para>
- The tools presented are for the most part completely open-ended and
- have quite good and/or extensive documentation of their own which
- can be used to solve just about any problem you might come across
- in Linux.
- Each section that describes a particular tool has links to that
- tool's documentation and website.
- </para>
-
- <para>
- The purpose of this 'HOWTO' is to present a set of common and
- generally useful tracing and profiling idioms along with their
- application (as appropriate) to each tool, in the context of a
- general-purpose 'drill-down' methodology that can be applied
- to solving a large number (90%?) of problems.
- For help with more advanced usages and problems, please see
- the documentation and/or websites listed for each tool.
- </para>
-
- <para>
- The final section of this 'HOWTO' is a collection of real-world
- examples which we'll be continually adding to as we solve more
- problems using the tools - feel free to add your own examples
- to the list!
- </para>
- </section>
-
- <section id='profile-manual-general-setup'>
- <title>General Setup</title>
-
- <para>
- Most of the tools are available only in 'sdk' images or in images
- built after adding 'tools-profile' to your local.conf.
- So, in order to be able to access all of the tools described here,
- please first build and boot an 'sdk' image e.g.
- <literallayout class='monospaced'>
- $ bitbake core-image-sato-sdk
- </literallayout>
- or alternatively by adding 'tools-profile' to the
- EXTRA_IMAGE_FEATURES line in your local.conf:
- <literallayout class='monospaced'>
- EXTRA_IMAGE_FEATURES = "debug-tweaks tools-profile"
- </literallayout>
- If you use the 'tools-profile' method, you don't need to build an
- sdk image - the tracing and profiling tools will be included in
- non-sdk images as well e.g.:
- <literallayout class='monospaced'>
- $ bitbake core-image-sato
- </literallayout>
- <note><para>
- By default, the Yocto build system strips symbols from the
- binaries it packages, which makes it difficult to use some
- of the tools.
- </para><para>You can prevent that by setting the
- <ulink url='&YOCTO_DOCS_REF_URL;#var-INHIBIT_PACKAGE_STRIP'><filename>INHIBIT_PACKAGE_STRIP</filename></ulink>
- variable to "1" in your
- <filename>local.conf</filename> when you build the image:
- </para>
- </note>
- <literallayout class='monospaced'>
- INHIBIT_PACKAGE_STRIP = "1"
- </literallayout>
- The above setting will noticeably increase the size of your image.
- </para>
-
- <para>
- If you've already built a stripped image, you can generate
- debug packages (xxx-dbg) which you can manually install as
- needed.
- </para>
-
- <para>
- To generate debug info for packages, you can add dbg-pkgs to
- EXTRA_IMAGE_FEATURES in local.conf. For example:
- <literallayout class='monospaced'>
- EXTRA_IMAGE_FEATURES = "debug-tweaks tools-profile dbg-pkgs"
- </literallayout>
- Additionally, in order to generate the right type of
- debuginfo, we also need to set
- <ulink url='&YOCTO_DOCS_REF_URL;#var-PACKAGE_DEBUG_SPLIT_STYLE'><filename>PACKAGE_DEBUG_SPLIT_STYLE</filename></ulink>
- in the <filename>local.conf</filename> file:
- <literallayout class='monospaced'>
- PACKAGE_DEBUG_SPLIT_STYLE = 'debug-file-directory'
- </literallayout>
- </para>
- </section>
-</chapter>
-<!--
-vim: expandtab tw=80 ts=4
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