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<body class="manpage">
<div id="header">
<h1>
libtraceevent(3) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>tep_get_page_size, tep_set_page_size, tep_get_sub_buffer_data_size, tep_get_sub_buffer_size -
   Get / set the size of a memory page on the machine, where the trace is generated
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>#include &lt;event-parse.h&gt;</strong>

int <strong>tep_get_page_size</strong>(struct tep_handle *<em>tep</em>);
void <strong>tep_set_page_size</strong>(struct tep_handle *<em>tep</em>, int <em>page_size</em>);
int <strong>tep_get_sub_buffer_size</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_sub_buffer_data_size</strong>(struct tep_handle *<em>tep</em>);
int <strong>tep_get_sub_buffer_commit_offset</strong>(struct tep_handle *<em>tep</em>);</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_get_page_size()</strong> function returns the size of a memory page on
the machine, where the trace is generated. The <em>tep</em> argument is trace
event parser context.</p></div>
<div class="paragraph"><p>The <strong>tep_set_page_size()</strong> function stores in the <em>tep</em> context the size of a
memory page on the machine, where the trace is generated.
The <em>tep</em> argument is trace event parser context.
The <em>page_size</em> argument is the size of a memory page, in bytes.</p></div>
<div class="paragraph"><p>The <strong>tep_get_sub_buffer_size()</strong> returns the size of each "sub buffer" of the
ring buffer. The Linux kernel ring buffer is broken up into sections called
sub buffers. This returns the size of those buffers.</p></div>
<div class="paragraph"><p>The <strong>tep_get_sub_buffer_data_size()</strong> returns the size of just the data portion
of the sub buffers.</p></div>
<div class="paragraph"><p>The <strong>tep_get_sub_buffer_commit_offset()</strong> returns the offset on the sub buffer
that holds the committed portion of data. This number contains the index from
the data portion of the sub buffer that is the end of the last element on the
sub buffer.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">RETURN VALUE</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <strong>tep_get_page_size()</strong> function returns size of the memory page, in bytes.</p></div>
<div class="paragraph"><p>The <strong>tep_get_sub_buffer_size()</strong> function returns the number of bytes each sub
buffer is made up of.</p></div>
<div class="paragraph"><p>The <strong>tep_get_sub_buffer_commit_offset()</strong> function returns the location on the
sub buffer that contains the index of the last element.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;unistd.h&gt;</span>
<span style="font-weight: bold"><span style="color: #000080">#include</span></span> <span style="color: #FF0000">&lt;event-parse.h&gt;</span>
<span style="color: #990000">...</span>
<span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #008080">tep_handle</span> <span style="color: #990000">*</span>tep <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">tep_alloc</span></span><span style="color: #990000">();</span>
<span style="color: #990000">...</span>
        <span style="color: #009900">int</span> page_size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">getpagesize</span></span><span style="color: #990000">();</span>

        <span style="font-weight: bold"><span style="color: #000000">tep_set_page_size</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">,</span> page_size<span style="color: #990000">);</span>

        <span style="font-weight: bold"><span style="color: #000000">printf</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"The page size for this machine is %d</span><span style="color: #CC33CC">\n</span><span style="color: #FF0000">"</span><span style="color: #990000">,</span> <span style="font-weight: bold"><span style="color: #000000">tep_get_page_size</span></span><span style="color: #990000">(</span>tep<span style="color: #990000">));</span>
</tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_files">FILES</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><strong>event-parse.h</strong>
        Header file to include in order to have access to the library APIs.
<strong>-ltraceevent</strong>
        Linker switch to add when building a program that uses the library.</pre>
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<h2 id="_see_also">SEE ALSO</h2>
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<div class="paragraph"><p><strong>libtraceevent</strong>(3), <strong>trace-cmd</strong>(1)</p></div>
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<h2 id="_author">AUTHOR</h2>
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<pre class="content"><strong>Steven Rostedt</strong> &lt;<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>&gt;, author of <strong>libtraceevent</strong>.
<strong>Tzvetomir Stoyanov</strong> &lt;<a href="mailto:tz.stoyanov@gmail.com">tz.stoyanov@gmail.com</a>&gt;, author of this man page.</pre>
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<h2 id="_reporting_bugs">REPORTING BUGS</h2>
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<div class="paragraph"><p>Report bugs to  &lt;<a href="mailto:linux-trace-devel@vger.kernel.org">linux-trace-devel@vger.kernel.org</a>&gt;</p></div>
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<h2 id="_license">LICENSE</h2>
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<div class="paragraph"><p>libtraceevent is Free Software licensed under the GNU LGPL 2.1</p></div>
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<h2 id="_resources">RESOURCES</h2>
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<div class="paragraph"><p><a href="https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/">https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/</a></p></div>
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Last updated
 2024-10-11 21:26:45 UTC
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