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<title>SystemTap: probes/where_func/ Directory Reference</title>
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<a class="el" href="dir_000000.html">probes</a> / <a class="el" href="dir_000004.html">where_func</a></div>
<h1>where_func Directory Reference</h1>This is a silly little instrumentation routine to instrument functions entry by name.
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<tr><td colspan="2"><br><h2>Files</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">file </td><td class="memItemRight" valign="bottom"><b>kprobe_where_funct.c</b> <a href="kprobe__where__funct_8c-source.html">[code]</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">file </td><td class="memItemRight" valign="bottom"><b>kprobe_where_funct.mod.c</b> <a href="kprobe__where__funct_8mod_8c-source.html">[code]</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">file </td><td class="memItemRight" valign="bottom"><b>README</b> <a href="probes_2where__func_2README-source.html">[code]</a></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
This is a silly little instrumentation routine to instrument functions entry by name.
<p>
It makes use of the SystemTap runtime libraries to break down the number of times the function by caller.<p>
It demonstrates kprobes, passing a module parameter, using the print buffer, and using _stp_print_symbol() to map the addresses back to locations in functions.<p>
By default it instruments schedule().<p>
The instrumentation module is built by having the kernel that is going to be instrumented currently on the machine and doing <div class="fragment"><pre class="fragment">./build
</pre></div> The instrumentation is inserted as root with: <div class="fragment"><pre class="fragment">/sbin/insmod kprobe_funct_where.ko funct_name=function_name
</pre></div> The instrumentation is removed as root with: <div class="fragment"><pre class="fragment">/sbin/rmmod kprobe_funct_where
</pre></div> -Will Cohen </body></html>
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