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| 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?> | 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?> |
| 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title xmlns:d="http://docbook.org/ns/docbook">5.3. Profiling</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta xmlns:d="http://docbook.org/ns/docbook" name="generator" content="not publican" /><meta xmlns:d="http://docbook.org/ns/docbook" name="package" content="" /><link rel="home" href="index.html" title="SystemTap Beginners Guide" /><link rel="up" href="useful-systemtap-scripts.html" title="Chapter 5. Useful SystemTap Scripts" /><link rel="prev" href="ioblktimesect.html" title="5.2.7. Periodically Print I/O Block Time" /><link rel="next" href="paracallgraph.html" title="5.3.2. Call Graph Tracing" /></head><body><p id="title"></p><ul class="docnav top"><li class="previous"><a accesskey="p" href="ioblktimesect.html"><strong>Prev</strong></a></li><li class="home">SystemTap Beginners Guide</li><li class="next"><a accesskey="n" href="paracallgraph.html"><strong>Next</strong></a></li></ul><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="mainsect-profiling"> | 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title xmlns:d="http://docbook.org/ns/docbook">5.3. Profiling</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta xmlns:d="http://docbook.org/ns/docbook" name="generator" content="not publican" /><meta xmlns:d="http://docbook.org/ns/docbook" name="package" content="" /><link rel="home" href="index.html" title="SystemTap Beginners Guide" /><link rel="up" href="useful-systemtap-scripts.html" title="Chapter 5. Useful SystemTap Scripts" /><link rel="prev" href="ioblktimesect.html" title="5.2.7. Periodically Print I/O Block Time" /><link rel="next" href="paracallgraph.html" title="5.3.2. Call Graph Tracing" /></head><body><p id="title"></p><ul class="docnav top"><li class="previous"><a accesskey="p" href="ioblktimesect.html"><strong>Prev</strong></a></li><li class="home">SystemTap Beginners Guide</li><li class="next"><a accesskey="n" href="paracallgraph.html"><strong>Next</strong></a></li></ul><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="mainsect-profiling"> |
| 3 | </a>5.3. Profiling</h2></div></div></div><div class="para">The following sections showcase scripts that profile kernel activity by monitoring function calls.</div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="countcallssect"> | 3 | </a>5.3. Profiling</h2></div></div></div><div class="para">The following sections showcase scripts that profile kernel activity by monitoring function calls.</div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="countcallssect"> |
| 4 | </a>5.3.1. Counting Function Calls Made</h3></div></div></div><a id="idm47006127141184" class="indexterm"></a><a id="idm47006126575440" class="indexterm"></a><a id="idm47006118210768" class="indexterm"></a><a id="idm47006124331600" class="indexterm"></a><a id="idm47006125951600" class="indexterm"></a><div class="para">This section describes how to identify how many times the system called a specific kernel function in a 30-second sample. Depending on the use of wildcards, you can also use this script to target multiple kernel functions.</div><div class="para"><div xmlns:d="http://docbook.org/ns/docbook" class="title">functioncallcount.stp</div> | 4 | </a>5.3.1. Counting Function Calls Made</h3></div></div></div><a id="idp71890972737408" class="indexterm"></a><a id="idp71890967497360" class="indexterm"></a><a id="idp71890960660928" class="indexterm"></a><a id="idp71890972028368" class="indexterm"></a><a id="idp71890963721808" class="indexterm"></a><div class="para">This section describes how to identify how many times the system called a specific kernel function in a 30-second sample. Depending on the use of wildcards, you can also use this script to target multiple kernel functions.</div><div class="para"><div xmlns:d="http://docbook.org/ns/docbook" class="title">functioncallcount.stp</div> |
| 5 | <pre class="programlisting">#! /usr/bin/env stap | 5 | <pre class="programlisting">#! /usr/bin/env stap |
| 6 | # The following line command will probe all the functions | 6 | # The following line command will probe all the functions |
| 7 | # in kernel's memory management code: | 7 | # in kernel's memory management code: |
| @@ -21,7 +21,7 @@ probe end { | |||
| 21 | exit() | 21 | exit() |
| 22 | } | 22 | } |
| 23 | </pre> | 23 | </pre> |
| 24 | </div><div class="para"><a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> takes the targeted kernel function as an argument. The argument supports wildcards, which enables you to target multiple kernel functions up to a certain extent.</div><a id="idm47006123335632" class="indexterm"></a><a id="idm47006124752288" class="indexterm"></a><a id="idm47006125934640" class="indexterm"></a><div class="para">The output of <a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> contains the name of the function called and how many times it was called during the sample time (in alphabetical order). <a class="xref" href="mainsect-profiling.html#countcallsoutput">Example 5.13, “functioncallcount.stp Sample Output”</a> contains an excerpt from the output of <code class="command">stap functioncallcount.stp "*@mm/*.c"</code>:</div><div class="example"><a id="countcallsoutput"> | 24 | </div><div class="para"><a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> takes the targeted kernel function as an argument. The argument supports wildcards, which enables you to target multiple kernel functions up to a certain extent.</div><a id="idp71890960516352" class="indexterm"></a><a id="idp71890968320128" class="indexterm"></a><a id="idp71890967762816" class="indexterm"></a><div class="para">The output of <a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> contains the name of the function called and how many times it was called during the sample time (in alphabetical order). <a class="xref" href="mainsect-profiling.html#countcallsoutput">Example 5.13, “functioncallcount.stp Sample Output”</a> contains an excerpt from the output of <code class="command">stap functioncallcount.stp "*@mm/*.c"</code>:</div><div class="example"><a id="countcallsoutput"> |
| 25 | </a><p class="title"><strong>Example 5.13. <a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> Sample Output</strong></p><div class="example-contents"><pre class="screen">[...] | 25 | </a><p class="title"><strong>Example 5.13. <a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> Sample Output</strong></p><div class="example-contents"><pre class="screen">[...] |
| 26 | __vma_link 97 | 26 | __vma_link 97 |
| 27 | __vma_link_file 66 | 27 | __vma_link_file 66 |