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<body class="manpage">
<div id="header">
<h1>
TRACE-CMD.DAT.v6(5) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace-cmd.dat.v6 -
   trace-cmd version 6 file format
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd.dat</strong> ignore</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The trace-cmd(1) utility produces a "trace.dat" file. The file may also
be named anything depending if the user specifies a different output name,
but it must have a certain binary format. The file is used
by trace-cmd to save kernel traces into it and be able to extract
the trace from it at a later point (see <strong>trace-cmd-report(1)</strong>).</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_initial_format">INITIAL FORMAT</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>The first three bytes contain the magic value:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>0x17 0x08  0x44</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 7 bytes contain the characters:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"tracing"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next set of characters contain a null '\0' terminated string
that contains the version of the file:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"6\0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 1 byte contains the flags for the file endianess:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>0 = little endian
1 = big endian</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next byte contains the number of bytes per "long" value:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>4 - 32-bit long values
8 - 64-bit long values</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>Note: This is the long size of the target's userspace. Not the
kernel space size.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>[ Now all numbers are written in file defined endianess. ]</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 4 bytes are a 32-bit word that defines what the traced
host machine page size was.</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_header_info_format">HEADER INFO FORMAT</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>Directly after the initial format comes information about the
trace headers recorded from the target box.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 12 bytes contain the string:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"header_page\0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 8 bytes are a 64-bit word containing the size of the
page header information stored next.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next set of data is of the size read from the previous 8 bytes,
and contains the data retrieved from debugfs/tracing/events/header_page.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>Note: The size of the second field \fBcommit\fR contains the target
kernel long size. For example:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>field: local_t commit;        offset:8;       \fBsize:8;\fR   signed:1;</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>shows the kernel has a 64-bit long.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 13 bytes contain the string:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"header_event\0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 8 bytes are a 64-bit word containing the size of the
event header information stored next.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next set of data is of the size read from the previous 8 bytes
and contains the data retrieved from debugfs/tracing/events/header_event.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>This data allows the trace-cmd tool to know if the ring buffer format
of the kernel made any changes.</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_ftrace_event_formats">FTRACE EVENT FORMATS</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>Directly after the header information comes the information about
the Ftrace specific events. These are the events used by the Ftrace plugins
and are not enabled by the event tracing.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 4 bytes contain a 32-bit word of the number of Ftrace event
format files that are stored in the file.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>For the number of times defined by the previous 4 bytes is the
following:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>8 bytes for the size of the Ftrace event format file.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The Ftrace event format file copied from the target machine:
debugfs/tracing/events/ftrace/&lt;event&gt;/format</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_event_formats">EVENT FORMATS</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>Directly after the Ftrace formats comes the information about
the event layout.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 4 bytes are a 32-bit word containing the number of
event systems that are stored in the file. These are the
directories in debugfs/tracing/events excluding the \fBftrace\fR
directory.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>For the number of times defined by the previous 4 bytes is the
following:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>A null-terminated string containing the system name.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>4 bytes containing a 32-bit word containing the number
of events within the system.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>For the number of times defined in the previous 4 bytes is the
following:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>8 bytes for the size of the event format file.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The event format file copied from the target machine:
debugfs/tracing/events/&lt;system&gt;/&lt;event&gt;/format</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_kallsyms_information">KALLSYMS INFORMATION</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>Directly after the event formats comes the information of the mapping
of function addresses to the function names.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 4 bytes are a 32-bit word containing the size of the
data holding the function mappings.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next set of data is of the size defined by the previous 4 bytes
and contains the information from the target machine's file:
/proc/kallsyms</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_trace_printk_information">TRACE_PRINTK INFORMATION</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>If a developer used trace_printk() within the kernel, it may
store the format string outside the ring buffer.
This information can be found in:
debugfs/tracing/printk_formats</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 4 bytes are a 32-bit word containing the size of the
data holding the printk formats.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next set of data is of the size defined by the previous 4 bytes
and contains the information from debugfs/tracing/printk_formats.</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_process_information">PROCESS INFORMATION</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>Directly after the trace_printk formats comes the information mapping
a PID to a process name.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 8 bytes contain a 64-bit word that holds the size of the
data mapping the PID to a process name.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next set of data is of the size defined by the previous 8 bytes
and contains the information from debugfs/tracing/saved_cmdlines.</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_rest_of_trace_cmd_header">REST OF TRACE-CMD HEADER</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>Directly after the process information comes the last bit of the
trace.dat file header.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 4 bytes are a 32-bit word defining the number of CPUs that
were discovered on the target machine (and has matching trace data
for it).</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 10 bytes are one of the following:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"options  \0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"latency  \0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"flyrecord\0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>If it is "options  \0" then:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 2 bytes are a 16-bit word defining the current option.
If the the value is zero then there are no more options.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>Otherwise, the next 4 bytes contain a 32-bit word containing the
option size. If the reader does not know how to handle the option
it can simply skip it. Currently there are no options defined,
but this is here to extend the data.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next option will be directly after the previous option, and
the options ends with a zero in the option type field.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The next 10 bytes after the options are one of the following:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"latency  \0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>"flyrecord\0"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>which would follow the same as if options were not present.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>If the value is "latency  \0", then the rest of the file is
simply ASCII text that was taken from the target's:
debugfs/tracing/trace</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>If the value is "flyrecord\0", the following is present:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>For the number of CPUs that were read earlier, the
following is present:</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>8 bytes that are a 64-bit word containing the offset into the file
that holds the data for the CPU.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>8 bytes that are a 64-bit word containing the size of the CPU
data at that offset.</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_cpu_data">CPU DATA</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>The CPU data is located in the part of the file that is specified
in the end of the header. Padding is placed between the header and
the CPU data, placing the CPU data at a page aligned (target page) position
in the file.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>This data is copied directly from the Ftrace ring buffer and is of the
same format as the ring buffer specified by the event header files
loaded in the header format file.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>The trace-cmd tool will try to \fBmmap(2)\fR the data page by page with the
target's page size if possible. If it fails to mmap, it will just read the
data instead.</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p>trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1),
trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1),
trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1),
trace-cmd.dat(5)</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="paragraph"><p>Written by Steven Rostedt, &lt;<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>&gt;</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_resources">RESOURCES</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/">https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/</a></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_copying">COPYING</h2>
<div class="sectionbody">
<div class="paragraph"><p>Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under
the terms of the GNU Public License (GPL).</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
 2023-06-07 20:21:00 UTC
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