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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Chapter&#160;3.&#160;Timestamp Functions</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"><link rel="home" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="up" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="prev" href="API-pn.html" title="function::pn"><link rel="next" href="API-get-cycles.html" title="function::get_cycles"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter&#160;3.&#160;Timestamp Functions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-pn.html">Prev</a>&#160;</td><th width="60%" align="center">&#160;</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-get-cycles.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter&#160;3.&#160;Timestamp Functions"><div class="titlepage"><div><div><h2 class="title"><a name="timestamp_stp"></a>Chapter&#160;3.&#160;Timestamp Functions</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="refentrytitle"><a href="API-get-cycles.html"><span>function::get_cycles</span></a></span><span class="refpurpose"> &#8212; 
  Processor cycle count
 </span></dt><dt><span class="refentrytitle"><a href="API-jiffies.html"><span>function::jiffies</span></a></span><span class="refpurpose"> &#8212; 
     Kernel jiffies count
 </span></dt><dt><span class="refentrytitle"><a href="API-HZ.html"><span>function::HZ</span></a></span><span class="refpurpose"> &#8212; 
     Kernel HZ
 </span></dt><dt><span class="refentrytitle"><a href="API-gettimeofday-ns.html"><span>function::gettimeofday_ns</span></a></span><span class="refpurpose"> &#8212; 
  Number of nanoseconds since UNIX epoch
 </span></dt><dt><span class="refentrytitle"><a href="API-gettimeofday-us.html"><span>function::gettimeofday_us</span></a></span><span class="refpurpose"> &#8212; 
     Number of microseconds since UNIX epoch
 </span></dt><dt><span class="refentrytitle"><a href="API-gettimeofday-ms.html"><span>function::gettimeofday_ms</span></a></span><span class="refpurpose"> &#8212; 
     Number of milliseconds since UNIX epoch
 </span></dt><dt><span class="refentrytitle"><a href="API-gettimeofday-s.html"><span>function::gettimeofday_s</span></a></span><span class="refpurpose"> &#8212; 
     Number of seconds since UNIX epoch
 </span></dt></dl></div><p>
      Each timestamp function returns a value to indicate when
      a function is executed.
      These returned values can then be used to indicate
      when an event occurred, provide an ordering for events, or compute
      the amount of time elapsed between two time stamps.
    </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-pn.html">Prev</a>&#160;</td><td width="20%" align="center">&#160;</td><td width="40%" align="right">&#160;<a accesskey="n" href="API-get-cycles.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>function::pn</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span>function::get_cycles</span></td></tr></table></div></body></html>