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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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647 lines
37 KiB
HTML
647 lines
37 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>>. <<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>
|
||
<body id="algorithms" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="algorithms"><a class="anchor" href="#algorithms"></a><a class="link" href="#algorithms">27.8. Algorithms</a></h3>
|
||
<div class="paragraph">
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm">userland/algorithm</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This is still work in progress and needs better automation, but is already a good sketch. Key missing features:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>actually check that outputs are correct in <code>./test</code></p>
|
||
</li>
|
||
<li>
|
||
<p>create a mechanism to run all or some selected hand coded inputs</p>
|
||
</li>
|
||
<li>
|
||
<p>create a mechanism to run generated input</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The idea was originally started at: <a href="https://github.com/cirosantilli/algorithm-cheat" class="bare">https://github.com/cirosantilli/algorithm-cheat</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The key idea is that input / output pairs are present in human readable files generated either:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>manually for small test inputs</p>
|
||
</li>
|
||
<li>
|
||
<p>with a Python script for larger randomized tests</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Test programs then:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>read input from sdtin</p>
|
||
</li>
|
||
<li>
|
||
<p>produce output to stdout</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>so that we can compare the output to the expected one.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This way, tests can be reused across several implementations in different languages, emulating the many multi-language programming competition websites out there.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For example, for a <a href="userland-setup-getting-started-natively.html">native run</a> we can can run a set / sorting test:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cd userland/algorithm/set
|
||
./build
|
||
|
||
# Run with a small hand written test.
|
||
./std_set.out < test_data/8.i > tmp.raw
|
||
|
||
# Extract the output from the sorted stdout, which also
|
||
# contained some timing information.
|
||
./parse_output output < tmp.raw > tmp.o
|
||
|
||
# Compare the output to the Expected one.
|
||
cmp tmp.o test_data/8.e
|
||
|
||
# Same but now with a large randomly generated input.
|
||
./generate_io
|
||
./std_set.out < tmp.i | ./parse_output output > tmp.o
|
||
cmp tmp.o tmp.e</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It is also possible to the algorithm tests normally from emulators in <a href="user-mode-simulation.html">User mode simulation</a> by setting stdin as explained at <a href="syscall-emulation-mode-program-stdin.html">syscall emulation mode program stdin</a>, e.g.:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --arch aarch64 -u userland/algorithm/set/std_set.cpp --stdin-file userland/algorithm/set/test_data/8.i</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Sources:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/generate_io">userland/algorithm/set/generate_io</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/main.hpp">userland/algorithm/set/main.hpp</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/parse_output">userland/algorithm/set/parse_output</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/std_set.cpp">userland/algorithm/set/std_set.cpp</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/test_data/8.e">userland/algorithm/set/test_data/8.e</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/test_data/8.i">userland/algorithm/set/test_data/8.i</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/algorithm/set/parse_output">userland/algorithm/set/parse_output</a> is needed because timing instrumentation measurements must be embedded in the program itself to allow:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>discounting the input reading / output writing operations from the actual "read / write to / from memory algorithm" itself</p>
|
||
</li>
|
||
<li>
|
||
<p>measuring the evolution of the benchmark mid way, e.g. to see how the current container size affects insertion time: <a href="bst-vs-heap-vs-hashmap.html">BST vs heap vs hashmap</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The following are also interesting Buildroot libraries that we could benchmark:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>Armadillo <code>C++</code>: linear algebra</p>
|
||
</li>
|
||
<li>
|
||
<p>fftw: Fourier transform</p>
|
||
</li>
|
||
<li>
|
||
<p>Flann</p>
|
||
</li>
|
||
<li>
|
||
<p>GSL: various</p>
|
||
</li>
|
||
<li>
|
||
<p>liblinear</p>
|
||
</li>
|
||
<li>
|
||
<p>libspacialindex</p>
|
||
</li>
|
||
<li>
|
||
<p>libtommath</p>
|
||
</li>
|
||
<li>
|
||
<p>qhull</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>These are good targets for <a href="gem5-run-benchmark.html">performance analysis with gem5</a>, and there is some overlap between this section and <a href="benchmarks.html">Benchmarks</a>.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="bst-vs-heap-vs-hashmap.html">BST vs heap vs hashmap</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="blas.html">BLAS</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="eigen.html">Eigen</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="java.html">Java</a> | ↑ Up: <a href="userland-content.html">Userland content</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="bst-vs-heap-vs-hashmap.html">BST vs heap vs hashmap</a> →</p>
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