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<body class="manpage">
<div id="header">
<h1>
TRACE-CMD-MEM(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace-cmd-mem -
   show memory usage of certain kmem events
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd mem</strong> [<em>OPTIONS</em>][<em>input-file</em>]</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The trace-cmd(1) mem requires a trace-cmd record that enabled the following
events:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>kmalloc
kmalloc_node
kfree
kmem_cache_alloc
kmem_cache_alloc_node
kmem_cache_alloc_free</code></pre>
</div></div>
<div class="paragraph"><p>It then reads the amount requested and the ammount freed as well as the
functions that called the allocation. It then reports the final amount
of bytes requested and allocated, along with the total amount allocated
and requested, as well as the max allocation and requested during the run.
It reports the amount of wasted bytes (allocated - requested) that was
not freed, as well as the max wasted amount during the run. The list is
sorted by descending order of wasted bytes after the run.</p></div>
<div class="literalblock">
<div class="content">
<pre><code>        Function                Waste   Alloc   req             TotAlloc     TotReq             MaxAlloc     MaxReq     MaxWaste
        --------                -----   -----   ---             --------     ------             --------     ------     --------
  rb_allocate_cpu_buffer        768     2304    1536                2304       1536                 2304       1536     768
         alloc_pipe_info        400     1152    752                 1152        752                 1152        752     400
          instance_mkdir        252     544     292                  544        292                  544        292     252
               __d_alloc        215     1086560 1086345          1087208    1086993              1086560    1086345     215
          get_empty_filp        72      2304    2232                4864       4712                 4864       4712     152
                mm_alloc        40      960     920                  960        920                  960        920     40
           prepare_creds        32      192     160                 1728       1440                 1728       1440     288
    tracing_buffers_open        8       32      24                    32         24                   32         24     8
                  do_brk        0       0       0                    368        368                  368        368     0
journal_add_journal_head        0       6048    6048                6048       6048                 6048       6048     0
           journal_start        0       0       0                   1224       1224                   48         48     0
     __rb_allocate_pages        0       3289856 3289856          3289856    3289856              3289856    3289856     0
          anon_vma_alloc        0       0       0                    936        936                  864        864     0
                                                        [...]</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>-i</strong> <em>input-file</em>
</dt>
<dd>
<p>
    By default, trace-cmd hist will read the file <em>trace.dat</em>. But the <strong>-i</strong>
    option open up the given <em>input-file</em> instead. Note, the input file may
    also be specified as the last item on the command line.
</p>
</dd>
</dl></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-hist(1),
trace-cmd-split(1), trace-cmd-listen(1)</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="paragraph"><p>Written by Steven Rostedt, <<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>></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) 2013 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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