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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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533 lines
35 KiB
HTML
533 lines
35 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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</head>
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<body id="gem5-hdf5-statistics" class="article">
|
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<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="gem5-hdf5-statistics"><a class="anchor" href="#gem5-hdf5-statistics"></a><a class="link" href="#gem5-hdf5-statistics">24.10.3.1. gem5 HDF5 statistics</a></h5>
|
||
<div class="paragraph">
|
||
<p>We can make gem5 dump statistics in the <a href="hdf5.html">HDF5</a> format by adding the magic <code>h5://</code> prefix to the file name as in:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>gem5.opt --stats-file h5://stats.h5</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>as explained in:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>gem5.opt --stats-help</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This is not exposed in LKMC f42c525d7973d70f4c836d2169cc2bd2893b4197 however, you just have to <a href="dry-run.html">hack the gem5 CLI for now</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO what is the advantage? The generated file for <code>--stats-file h5://stats.h5?desc=False</code> in LKMC f42c525d7973d70f4c836d2169cc2bd2893b4197 gem5 5af26353b532d7b5988cf0f6f3d0fbc5087dd1df for a single dump was 946K, so much larger than the text version seen at <a href="gem5-m5out-stats-txt-file.html">gem5 m5out/stats.txt file</a> which was only 59KB max!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We then try to see if it is any better when you have a bunch of dump events:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --arch aarch64 --emulator gem5 --userland userland/c/m5ops.c --cli-args 'd 1000'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and there yes, we see that the file size fell from 39MB on <code>stats.txt</code> to 3.2MB on <code>stats.m5</code>, so the increase observed previously was just due to some initial size overhead (considering the patched gem5 with no spaces in the text file).</p>
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<div class="paragraph">
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<p>We also note however that the stat dump made the such a simulation that just loops and dumps considerably slower, from 3s to 15s on <a href="p51.html">2017 Lenovo ThinkPad P51</a>. Fascinating, we are definitely not disk bound there.</p>
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</div>
|
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<div class="paragraph">
|
||
<p>We enable HDF5 on the build by default with <code>USE_HDF5=1</code>. To disable it, you can add <code>USE_HDF5=0</code> to the build as in:</p>
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</div>
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||
<div class="literalblock">
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||
<div class="content">
|
||
<pre>./build-gem5 -- USE_HDF5=0</pre>
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||
</div>
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||
</div>
|
||
<div class="paragraph">
|
||
<p>Library support is automatically detected, and only built if you have it installed. But there have been some compilation bugs with HDF5, which is why you might want to turn it off sometimes, e.g.: <a href="https://gem5.atlassian.net/browse/GEM5-365" class="bare">https://gem5.atlassian.net/browse/GEM5-365</a></p>
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<p>↑ Up: <a href="gem5-m5out-stats-txt-file.html">gem5 m5out/stats.txt file</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-only-dump-selected-stats.html">gem5 only dump selected stats</a> →</p>
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