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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"> | 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="publican v4.0.0" /><meta xmlns:d="http://docbook.org/ns/docbook" name="package" content="SystemTap-SystemTap_Beginners_Guide-2.6-en-US-2.0-1" /><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"><a class="left" href="https://fedorahosted.org/publican"><img alt="Product Site" src="Common_Content/images//image_left.png" /></a><a class="right" href="https://fedorahosted.org/publican"><img alt="Documentation Site" src="Common_Content/images//image_right.png" /></a></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"></a>5.3. Profiling</h2></div></div></div><div class="para"> |
| 3 | <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>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 name="generator" content="publican 2.8" /><meta name="package" content="Systemtap-SystemTap_Beginners_Guide-2.2-en-US-2.2-2" /><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"><a class="left" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="ioblktimesect.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="paracallgraph.html"><strong>Next</strong></a></li></ul><div class="section" id="mainsect-profiling"><div class="titlepage"><div><div><h2 class="title" id="mainsect-profiling">5.3. Profiling</h2></div></div></div><div class="para"> | ||
| 4 | The following sections showcase scripts that profile kernel activity by monitoring function calls. | 3 | The following sections showcase scripts that profile kernel activity by monitoring function calls. |
| 5 | </div><div xml:lang="en-US" class="section" id="countcallssect" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="countcallssect">5.3.1. Counting Function Calls Made</h3></div></div></div><a id="idp27256512" class="indexterm"></a><a id="idp15269888" class="indexterm"></a><a id="idp32452944" class="indexterm"></a><a id="idp56780544" class="indexterm"></a><a id="idp50542592" class="indexterm"></a><div class="para"> | 4 | </div><div xml:lang="en-US" class="section" lang="en-US"><div class="titlepage"><div><div><h3 class="title"><a id="countcallssect"></a>5.3.1. Counting Function Calls Made</h3></div></div></div><a id="idm246928792224" class="indexterm"></a><a id="idm246926783616" class="indexterm"></a><a id="idm246929560080" class="indexterm"></a><a id="idm246883103504" class="indexterm"></a><a id="idm246928487280" class="indexterm"></a><div class="para"> |
| 6 | This section describes how to identify how many times the system called a specific kernel function in a 30-second sample. Depending on your use of wildcards, you can also use this script to target multiple kernel functions. | 5 | 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. |
| 7 | </div><div class="formalpara" id="countcalls"><h5 class="formalpara">functioncallcount.stp</h5> | 6 | </div><div class="formalpara"><div xmlns:d="http://docbook.org/ns/docbook" class="title">functioncallcount.stp</div> |
| 8 | 7 | ||
| 9 | <pre class="programlisting">#! /usr/bin/env stap | 8 | <pre class="programlisting">#! /usr/bin/env stap |
| 10 | # The following line command will probe all the functions | 9 | # The following line command will probe all the functions |
| @@ -27,9 +26,9 @@ probe end { | |||
| 27 | </pre> | 26 | </pre> |
| 28 | </div><div class="para"> | 27 | </div><div class="para"> |
| 29 | <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. | 28 | <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. |
| 30 | </div><a id="idm2435968" class="indexterm"></a><a id="idp45873792" class="indexterm"></a><a id="idm3930928" class="indexterm"></a><div class="para"> | 29 | </div><a id="idm246926560512" class="indexterm"></a><a id="idm246927329984" class="indexterm"></a><a id="idm246917042560" class="indexterm"></a><div class="para"> |
| 31 | 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>: | 30 | 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>: |
| 32 | </div><div class="example" id="countcallsoutput"><h6>Example 5.13. <a class="xref" href="mainsect-profiling.html#countcalls">functioncallcount.stp</a> Sample Output</h6><div class="example-contents"><pre class="screen">[...] | 31 | </div><div class="example"><a id="countcallsoutput"></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">[...] |
| 33 | __vma_link 97 | 32 | __vma_link 97 |
| 34 | __vma_link_file 66 | 33 | __vma_link_file 66 |
| 35 | __vma_link_list 97 | 34 | __vma_link_list 97 |
| @@ -56,4 +55,4 @@ atomic_add_negative 97 | |||
| 56 | atomic_dec_and_test 5153 | 55 | atomic_dec_and_test 5153 |
| 57 | atomic_inc 470 | 56 | atomic_inc 470 |
| 58 | atomic_inc_and_test 1 | 57 | atomic_inc_and_test 1 |
| 59 | [...]</pre></div></div><br class="example-break" /></div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="ioblktimesect.html"><strong>Prev</strong>5.2.7. Periodically Print I/O Block Time</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="paracallgraph.html"><strong>Next</strong>5.3.2. Call Graph Tracing</a></li></ul></body></html> | 58 | [...]</pre></div></div><br class="example-break" /></div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="ioblktimesect.html"><strong>Prev</strong>5.2.7. Periodically Print I/O Block Time</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="paracallgraph.html"><strong>Next</strong>5.3.2. Call Graph Tracing</a></li></ul></body></html> \ No newline at end of file |