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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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631 lines
38 KiB
HTML
631 lines
38 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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|
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.nav-footer > p > a {white-space: nowrap;}</style>
|
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</head>
|
||
<body id="gem5-restore-new-script" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="gem5-restore-new-script"><a class="anchor" href="#gem5-restore-new-script"></a><a class="link" href="#gem5-restore-new-script">24.6.3. gem5 checkpoint restore and run a different script</a></h4>
|
||
<div class="paragraph">
|
||
<p>You want to automate running several tests from a single pristine post-boot state.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The problem is that boot takes forever, and after the checkpoint, the memory and disk states are fixed, so you can’t for example:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>hack up an existing rc script, since the disk is fixed</p>
|
||
</li>
|
||
<li>
|
||
<p>inject new kernel boot command line options, since those have already been put into memory by the bootloader</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>There is however a few loopholes, <a href="m5-readfile.html">m5 readfile</a> being the simplest, as it reads whatever is present on the host.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So we can do it like:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre># Boot, checkpoint and exit.
|
||
printf 'echo "setup run";m5 exit' > "$(./getvar gem5_readfile_file)"
|
||
./run --emulator gem5 --eval 'm5 checkpoint;m5 readfile > /tmp/gem5.sh && sh /tmp/gem5.sh'
|
||
|
||
# Restore and run the first benchmark.
|
||
printf 'echo "first benchmark";m5 exit' > "$(./getvar gem5_readfile_file)"
|
||
./run --emulator gem5 --gem5-restore 1
|
||
|
||
# Restore and run the second benchmark.
|
||
printf 'echo "second benchmark";m5 exit' > "$(./getvar gem5_readfile_file)"
|
||
./run --emulator gem5 --gem5-restore 1
|
||
|
||
# If something weird happened, create an interactive shell to examine the system.
|
||
printf 'sh' > "$(./getvar gem5_readfile_file)"
|
||
./run --emulator gem5 --gem5-restore 1</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Since this is such a common setup, we provide the following helpers for this operation:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>./run --gem5-readfile</code> is a convenient way to set the <code>m5 readfile</code> file contents from a string in the command line, e.g.:</p>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre># Boot, checkpoint and exit.
|
||
./run --emulator gem5 --eval './gem5.sh' --gem5-readfile 'echo "setup run"'
|
||
|
||
# Restore and run the first benchmark.
|
||
./run --emulator gem5 --gem5-restore 1 --gem5-readfile 'echo "first benchmark"'
|
||
|
||
# Restore and run the second benchmark.
|
||
./run --emulator gem5 --gem5-restore 1 --gem5-readfile 'echo "second benchmark"'</pre>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/rootfs_overlay/lkmc/gem5.sh">rootfs_overlay/lkmc/gem5.sh</a>. This script is analogous to gem5’s in-tree <a href="https://github.com/gem5/gem5/blob/2b4b94d0556c2d03172ebff63f7fc502c3c26ff8/configs/boot/hack_back_ckpt.rcS">hack_back_ckpt.rcS</a>, but with less noise.</p>
|
||
<div class="paragraph">
|
||
<p>Usage:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre># Boot, checkpoint and exit.
|
||
./run --emulator gem5 --eval './gem5.sh' --gem5-readfile 'echo "setup run"'
|
||
|
||
# Restore and run the first benchmark.
|
||
./run --emulator gem5 --gem5-restore 1 --gem5-readfile 'echo "first benchmark"'
|
||
|
||
# Restore and run the second benchmark.
|
||
./run --emulator gem5 --gem5-restore 1 --gem5-readfile 'echo "second benchmark"'</pre>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Their usage is also exemplified at <a href="gem5-run-benchmark.html">gem5 run benchmark</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>If you forgot to use an appropriate <code>--eval</code> for your boot and the simulation is already running, <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/rootfs_overlay/lkmc/gem5.sh">rootfs_overlay/lkmc/gem5.sh</a> can be used directly from an interactive guest shell.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>First we reset the readfile to something that runs quickly:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>printf 'echo "first benchmark"' > "$(./getvar gem5_readfile_file)"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and then in the guest, take a checkpoint and exit with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./gem5.sh</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Now the guest is in a state where readfile will be executed automatically without interactive intervention:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --emulator gem5 --gem5-restore 1 --gem5-readfile 'echo "first benchmark"'
|
||
./run --emulator gem5 --gem5-restore 1 --gem5-readfile 'echo "second benchmark"'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Other loophole possibilities to execute different benchmarks non-interactively include:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="9p.html">9P</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="secondary-disk.html">Secondary disk</a></p>
|
||
</li>
|
||
<li>
|
||
<p><code>expect</code> as mentioned at: <a href="https://stackoverflow.com/questions/7013137/automating-telnet-session-using-bash-scripts" class="bare">https://stackoverflow.com/questions/7013137/automating-telnet-session-using-bash-scripts</a></p>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>#!/usr/bin/expect
|
||
spawn telnet localhost 3456
|
||
expect "# $"
|
||
send "pwd\r"
|
||
send "ls /\r"
|
||
send "m5 exit\r"
|
||
expect eof</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This is ugly however as it is not deterministic.</p>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p><a href="https://www.mail-archive.com/gem5-users@gem5.org/msg15233.html" class="bare">https://www.mail-archive.com/gem5-users@gem5.org/msg15233.html</a></p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="gem5-checkpoint-internals.html">gem5 checkpoint internals</a> | ↑ Up: <a href="gem5-checkpoint.html">gem5 checkpoint</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-restore-checkpoint-with-a-different-cpu.html">gem5 restore checkpoint with a different CPU</a> →</p>
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