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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>The channel-measurement facility</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Writing s390 channel device drivers" /><link rel="up" href="ch02.html" title="Chapter 2. The ccw bus" /><link rel="prev" href="re38.html" title="ccw_device_tm_intrg" /><link rel="next" href="re39.html" title="struct cmbdata" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">The channel-measurement facility</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re38.html">Prev</a> </td><th width="60%" align="center">Chapter 2. The ccw bus</th><td width="20%" align="right"> <a accesskey="n" href="re39.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="The channel-measurement facility"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="cmf"></a>The channel-measurement facility</h2></div></div></div><div class="toc"><dl><dt><span class="refentrytitle"><a href="re39.html"><span>struct cmbdata</span></a></span><span class="refpurpose"> —
channel measurement block data for user space
</span></dt><dt><span class="refentrytitle"><a href="re40.html"><span>enable_cmf</span></a></span><span class="refpurpose"> —
switch on the channel measurement for a specific device
</span></dt><dt><span class="refentrytitle"><a href="re41.html"><span>disable_cmf</span></a></span><span class="refpurpose"> —
switch off the channel measurement for a specific device
</span></dt><dt><span class="refentrytitle"><a href="re42.html"><span>cmf_read</span></a></span><span class="refpurpose"> —
read one value from the current channel measurement block
</span></dt><dt><span class="refentrytitle"><a href="re43.html"><span>cmf_readall</span></a></span><span class="refpurpose"> —
read the current channel measurement block
</span></dt></dl></div><p>
The channel-measurement facility provides a means to collect
measurement data which is made available by the channel subsystem
for each channel attached device.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re38.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re39.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>ccw_device_tm_intrg</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>struct cmbdata</span></td></tr></table></div></body></html>
