runtime/docs/html/probes_2test4_2README-source.html


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<h1>README</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/** @dir test4</span>
00002 <span class="comment">This example probe tracks file opens, reads and writes.</span>
00003 <span class="comment">It demonstrates maps, stats, and iterators.</span>
00004 <span class="comment"></span>
00005 <span class="comment">This is a translation of on an old dtr probe.  Original source is</span>
00006 <span class="comment">\verbatim</span>
00007 <span class="comment">global {</span>
00008 <span class="comment">  long @opens[string];</span>
00009 <span class="comment">  sum @reads[string], @writes[string];</span>
00010 <span class="comment">}</span>
00011 <span class="comment"></span>
00012 <span class="comment">probe sys_open:entry {</span>
00013 <span class="comment">  @opens[current-&gt;comm]++;</span>
00014 <span class="comment">}</span>
00015 <span class="comment"></span>
00016 <span class="comment">probe sys_read:entry {</span>
00017 <span class="comment">  @reads[current-&gt;comm] &lt;&lt; count;</span>
00018 <span class="comment">}</span>
00019 <span class="comment"></span>
00020 <span class="comment">probe sys_write:entry {</span>
00021 <span class="comment">  @writes[current-&gt;comm] &lt;&lt; count;</span>
00022 <span class="comment">}</span>
00023 <span class="comment">\endverbatim</span>
00024 <span class="comment">*/</span>
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