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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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608 lines
38 KiB
HTML
608 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>>. <<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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</head>
|
||
<body id="gem5-event-queue" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="gem5-event-queue"><a class="anchor" href="#gem5-event-queue"></a><a class="link" href="#gem5-event-queue">24.22.4. gem5 event queue</a></h4>
|
||
<div class="paragraph">
|
||
<p>gem5 is an event based simulator, and as such the event queue is of of the crucial elements in the system.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Every single action that takes time (e.g. notably <a href="timingsimplecpu-analysis-ldr-stall.html">reading from memory</a>) models that time delay by scheduling an event in the future.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The gem5 event queue stores one callback event for each future point in time.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The event queue is implemented in the class <code>EventQueue</code> in the file <code>src/sim/eventq.hh</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Not all times need to have an associated event: if a given time has no events, gem5 just skips it and jumps to the next event: the queue is basically a linked list of events.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Important examples of events include:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>CPU ticks</p>
|
||
</li>
|
||
<li>
|
||
<p>peripherals and memory</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>At <a href="gem5-event-queue-atomicsimplecpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue AtomicSimpleCPU syscall emulation freestanding example analysis</a> we see for example that at the beginning of an <a href="gem5-atomicsimplecpu.html">AtomicCPU</a> simulation, gem5 sets up exactly two events:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>the first CPU cycle</p>
|
||
</li>
|
||
<li>
|
||
<p>one exit event at the end of time which triggers <a href="gem5-simulate-limit-reached.html">gem5 simulate() limit reached</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then, at the end of the callback of one tick event, another tick is scheduled.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>And so the simulation progresses tick by tick, until an exit event happens.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The <code>EventQueue</code> class has one awesome <code>dump()</code> function that prints a human friendly representation of the queue, and can be easily called from GDB. TODO example.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We can also observe what is going on in the event queue with the <code>Event</code> <a href="gem5-tracing.html">debug flag</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Event execution is done at <code>EventQueue::serviceOne()</code>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>Event *exit_event = eventq->serviceOne();</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This calls the <code>Event::process</code> method of the event.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Another important technique is to use <a href="debug-the-emulator.html">GDB</a> and break at interesting points such as:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>b Trace::OstreamLogger::logMessage
|
||
b EventManager::schedule
|
||
b EventFunctionWrapper::process</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>although stepping into <code>EventFunctionWrapper::process</code> which does <code>std::function</code> is a bit of a pain: <a href="https://stackoverflow.com/questions/59429401/how-to-step-into-stdfunction-user-code-from-c-functional-with-gdb" class="bare">https://stackoverflow.com/questions/59429401/how-to-step-into-stdfunction-user-code-from-c-functional-with-gdb</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Another potentially useful technique is to use:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>--trace Event,ExecAll,FmtFlag,FmtStackTrace --trace-stdout</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which automates the logging of <code>Trace::OstreamLogger::logMessage()</code> backtraces.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>But alas, it misses which function callback is being scheduled, which is the awesome thing we actually want:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://stackoverflow.com/questions/37545327/get-the-name-of-a-stdfunction" class="bare">https://stackoverflow.com/questions/37545327/get-the-name-of-a-stdfunction</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://stackoverflow.com/questions/40706805/how-to-convert-a-function-pointer-to-function-name/40706869" class="bare">https://stackoverflow.com/questions/40706805/how-to-convert-a-function-pointer-to-function-name/40706869</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then, once we had that, the most perfect thing ever would be to make the full event graph containing which events schedule which events!</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="gem5-event-queue-atomicsimplecpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue AtomicSimpleCPU syscall emulation freestanding example analysis</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-timingsimplecpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue TimingSimpleCPU syscall emulation freestanding example analysis</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-timingsimplecpu-syscall-emulation-freestanding-example-analysis-with-caches.html">gem5 event queue TimingSimpleCPU syscall emulation freestanding example analysis with caches</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-atomicsimplecpu-syscall-emulation-freestanding-example-analysis-with-caches-and-multiple-cpus.html">gem5 event queue AtomicSimpleCPU syscall emulation freestanding example analysis with caches and multiple CPUs</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-timingsimplecpu-syscall-emulation-freestanding-example-analysis-with-caches-and-multiple-cpus.html">gem5 event queue TimingSimpleCPU syscall emulation freestanding example analysis with caches and multiple CPUs</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-timingsimplecpu-syscall-emulation-freestanding-example-analysis-with-caches-and-multiple-cpus-and-ruby.html">gem5 event queue TimingSimpleCPU syscall emulation freestanding example analysis with caches and multiple CPUs and Ruby</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-minorcpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue MinorCPU syscall emulation freestanding example analysis</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-event-queue-derivo3cpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue DerivO3CPU syscall emulation freestanding example analysis</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="gem5-m5-objects-module.html">gem5 <code>m5.objects</code> module</a> | ↑ Up: <a href="gem5-internals.html">gem5 internals</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-event-queue-atomicsimplecpu-syscall-emulation-freestanding-example-analysis.html">gem5 event queue AtomicSimpleCPU syscall emulation freestanding example analysis</a> →</p>
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