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- <title>Linux Kernel Module Cheat</title>
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- </head>
- <body id="gem5-commmonitor" class="article">
- <div id="header">
- <h1>Linux Kernel Module Cheat</h1>
- </div>
- <div id="content">
- <div class="sect3">
- <h4 id="gem5-commmonitor"><a class="anchor" href="#gem5-commmonitor"></a><a class="link" href="#gem5-commmonitor">24.21.4. gem5 <code>CommMonitor</code></a></h4>
- <div class="paragraph">
- <p>You can place this <a href="gem5-python-c-interaction.html">SimObject</a> in between two <a href="gem5-port-system.html">ports</a> to get extra statistics about the packets that are going through.</p>
- </div>
- <div class="paragraph">
- <p>It only works on <a href="gem5-functional-vs-atomic-vs-timing-memory-requests.html">timing requests</a>, and does not seem to dump any memory values, only add extra <a href="gem5-m5out-stats-txt-file.html">statistics</a>.</p>
- </div>
- <div class="paragraph">
- <p>For example, the patch <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/patches/manual/gem5-commmonitor-se.patch">patches/manual/gem5-commmonitor-se.patch</a> hack a <code>CommMonitor</code> between the CPU and the L1 cache on top of gem5 1c3662c9557c85f0d25490dc4fbde3f8ab0cb350:</p>
- </div>
- <div class="literalblock">
- <div class="content">
- <pre>patch -d "$(./getvar gem5_source_dir)" -p 1 < patches/manual/gem5-commmonitor-se.patch</pre>
- </div>
- </div>
- <div class="paragraph">
- <p>That patch was done largely by copying what <code>fs.py --memcheck</code> does with a <code>MemChecker</code> object.</p>
- </div>
- <div class="paragraph">
- <p>You can then run with:</p>
- </div>
- <div class="literalblock">
- <div class="content">
- <pre>./run \
- --arch aarch64 \
- --emulator gem5 \
- --userland userland/arch/aarch64/freestanding/linux/hello.S \
- -- \
- --caches \
- --cpu-type TimingSimpleCPU \
- ;</pre>
- </div>
- </div>
- <div class="paragraph">
- <p>and now we have some new extra histogram statistics such as:</p>
- </div>
- <div class="literalblock">
- <div class="content">
- <pre>system.cpu.dcache_mon.readBurstLengthHist::samples 1</pre>
- </div>
- </div>
- <div class="paragraph">
- <p>One neat thing about this is that it is agnostic to the memory object type, so you don’t have to recode those statistics for every new type of object that operates on memory packets.</p>
- </div>
- <div class="ulist">
- <ul>
- </ul>
- </div>
- </div>
- <div class="paragraph nav-footer">
- <p>← Previous: <a href="gem5-mshr.html">gem5 <code>MSHR</code></a> | ↑ Up: <a href="gem5-memory-system.html">gem5 memory system</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-simplememory.html">gem5 <code>SimpleMemory</code></a> →</p>
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