<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Chapter 3. 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-usymname.html" title="function::usymname"><link rel="next" href="API-HZ.html" title="function::HZ"></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 3. Timestamp Functions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usymname.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="API-HZ.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 3. Timestamp Functions"><div class="titlepage"><div><div><h2 class="title"><a name="timestamp_stp"></a>Chapter 3. Timestamp Functions</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="refentrytitle"><a href="API-HZ.html"><span>function::HZ</span></a></span><span class="refpurpose"> —
Kernel HZ
</span></dt><dt><span class="refentrytitle"><a href="API-cpu-clock-ms.html"><span>function::cpu_clock_ms</span></a></span><span class="refpurpose"> —
Number of milliseconds on the given cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-cpu-clock-ns.html"><span>function::cpu_clock_ns</span></a></span><span class="refpurpose"> —
Number of nanoseconds on the given cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-cpu-clock-s.html"><span>function::cpu_clock_s</span></a></span><span class="refpurpose"> —
Number of seconds on the given cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-cpu-clock-us.html"><span>function::cpu_clock_us</span></a></span><span class="refpurpose"> —
Number of microseconds on the given cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-delete-stopwatch.html"><span>function::delete_stopwatch</span></a></span><span class="refpurpose"> —
Remove an existing stopwatch
</span></dt><dt><span class="refentrytitle"><a href="API-get-cycles.html"><span>function::get_cycles</span></a></span><span class="refpurpose"> —
Processor cycle count
</span></dt><dt><span class="refentrytitle"><a href="API-gettimeofday-ms.html"><span>function::gettimeofday_ms</span></a></span><span class="refpurpose"> —
Number of milliseconds since UNIX epoch
</span></dt><dt><span class="refentrytitle"><a href="API-gettimeofday-ns.html"><span>function::gettimeofday_ns</span></a></span><span class="refpurpose"> —
Number of nanoseconds 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"> —
Number of seconds 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"> —
Number of microseconds since UNIX epoch
</span></dt><dt><span class="refentrytitle"><a href="API-jiffies.html"><span>function::jiffies</span></a></span><span class="refpurpose"> —
Kernel jiffies count
</span></dt><dt><span class="refentrytitle"><a href="API-local-clock-ms.html"><span>function::local_clock_ms</span></a></span><span class="refpurpose"> —
Number of milliseconds on the local cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-local-clock-ns.html"><span>function::local_clock_ns</span></a></span><span class="refpurpose"> —
Number of nanoseconds on the local cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-local-clock-s.html"><span>function::local_clock_s</span></a></span><span class="refpurpose"> —
Number of seconds on the local cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-local-clock-us.html"><span>function::local_clock_us</span></a></span><span class="refpurpose"> —
Number of microseconds on the local cpu's clock
</span></dt><dt><span class="refentrytitle"><a href="API-read-stopwatch-ms.html"><span>function::read_stopwatch_ms</span></a></span><span class="refpurpose"> —
Reads the time in milliseconds for a stopwatch
</span></dt><dt><span class="refentrytitle"><a href="API-read-stopwatch-ns.html"><span>function::read_stopwatch_ns</span></a></span><span class="refpurpose"> —
Reads the time in nanoseconds for a stopwatch
</span></dt><dt><span class="refentrytitle"><a href="API-read-stopwatch-s.html"><span>function::read_stopwatch_s</span></a></span><span class="refpurpose"> —
Reads the time in seconds for a stopwatch
</span></dt><dt><span class="refentrytitle"><a href="API-read-stopwatch-us.html"><span>function::read_stopwatch_us</span></a></span><span class="refpurpose"> —
Reads the time in microseconds for a stopwatch
</span></dt><dt><span class="refentrytitle"><a href="API-start-stopwatch.html"><span>function::start_stopwatch</span></a></span><span class="refpurpose"> —
Start a stopwatch
</span></dt><dt><span class="refentrytitle"><a href="API-stop-stopwatch.html"><span>function::stop_stopwatch</span></a></span><span class="refpurpose"> —
Stop a stopwatch
</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-usymname.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="API-HZ.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>function::usymname</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>function::HZ</span></td></tr></table></div></body></html>
