1<html><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 V1.78.1"><link rel="home" href="index.html" title="Writing s390 channel device drivers"><link rel="up" href="ccw.html" title="Chapter 2. The ccw bus"><link rel="prev" href="API-ccw-device-get-schid.html" title="ccw_device_get_schid"><link rel="next" href="re46.html" title=".//arch/s390/include/asm/cmb.h"></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">The channel-measurement facility</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ccw-device-get-schid.html">Prev</a> </td><th width="60%" align="center">Chapter 2. The ccw bus</th><td width="20%" align="right"> <a accesskey="n" href="re46.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="cmf"></a>The channel-measurement facility</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="re46.html"> 2 .//arch/s390/include/asm/cmb.h 3 </a></span><span class="refpurpose"> — 4 Document generation inconsistency 5 </span></dt><dt><span class="refentrytitle"><a href="API-enable-cmf.html"><span class="phrase">enable_cmf</span></a></span><span class="refpurpose"> — 6 switch on the channel measurement for a specific device 7 </span></dt><dt><span class="refentrytitle"><a href="API-disable-cmf.html"><span class="phrase">disable_cmf</span></a></span><span class="refpurpose"> — 8 switch off the channel measurement for a specific device 9 </span></dt><dt><span class="refentrytitle"><a href="API-cmf-read.html"><span class="phrase">cmf_read</span></a></span><span class="refpurpose"> — 10 read one value from the current channel measurement block 11 </span></dt><dt><span class="refentrytitle"><a href="API-cmf-readall.html"><span class="phrase">cmf_readall</span></a></span><span class="refpurpose"> — 12 read the current channel measurement block 13 </span></dt></dl></div><p> 14 The channel-measurement facility provides a means to collect 15 measurement data which is made available by the channel subsystem 16 for each channel attached device. 17 </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-ccw-device-get-schid.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ccw.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re46.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">ccw_device_get_schid</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">  18 .//arch/s390/include/asm/cmb.h 19 </td></tr></table></div></body></html> 20