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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>>. 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>
|
||
<body id="gem5-fast-forward" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="gem5-fast-forward"><a class="anchor" href="#gem5-fast-forward"></a><a class="link" href="#gem5-fast-forward">24.6.4.1. gem5 fast forward</a></h5>
|
||
<div class="paragraph">
|
||
<p>Besides switching CPUs after a checkpoint restore, fs.py also has the <code>--fast-forward</code> option to automatically run the script from the start on a less detailed CPU, and switch to a more detailed CPU at a given tick.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This is generally useless compared to checkpoint restoring because:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>checkpoint restore allows to run multiple contents after the restore, and restoring to multiple different system states, which you almost always want to do</p>
|
||
</li>
|
||
<li>
|
||
<p>we generally don’t know the exact tick at which the region of interest will start, especially as the binaries change. It is much easier to just instrument the content with a checkoint <a href="m5ops.html">m5op</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>But let’s give it a try anyway with <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/freestanding/gem5_checkpoint.S">userland/freestanding/gem5_checkpoint.S</a> which was mentioned at <a href="gem5-checkpoint-userland-minimal-example.html">gem5 checkpoint userland minimal example</a></p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run \
|
||
--arch aarch64 \
|
||
--emulator gem5 \
|
||
--static \
|
||
--trace ExecAll,FmtFlag,O3CPU,SimpleCPU \
|
||
--userland userland/freestanding/gem5_checkpoint.S \
|
||
-- \
|
||
--caches
|
||
--cpu-type DerivO3CPU \
|
||
--fast-forward 1000 \
|
||
;
|
||
cat "$(./getvar --arch aarch64 --emulator gem5 trace_txt_file)"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>At gem5 2235168b72537535d74c645a70a85479801e0651 we see something like:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> 0: O3CPU: system.switch_cpus: Creating O3CPU object.
|
||
0: O3CPU: system.switch_cpus: Workload[0] process is 0 0: SimpleCPU: system.cpu: ActivateContext 0
|
||
0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0 WriteReq
|
||
0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0x40 WriteReq
|
||
...
|
||
|
||
0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0x1f92 WriteReq
|
||
0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0x1e40 WriteReq
|
||
0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0x1e30 WriteReq
|
||
0: SimpleCPU: system.cpu: Tick
|
||
0: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue : movz x0, #0, #0 : IntAlu : D=0x0000000000000000 flags=(IsInteger)
|
||
500: SimpleCPU: system.cpu: Tick
|
||
500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+4 : movz x1, #0, #0 : IntAlu : D=0x0000000000000000 flags=(IsInteger)
|
||
1000: SimpleCPU: system.cpu: Tick
|
||
1000: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+8 : m5checkpoint : IntAlu : flags=(IsInteger|IsNonSpeculative|IsUnverifiable)
|
||
1000: O3CPU: system.switch_cpus: [tid:0] Calling activate thread.
|
||
1000: O3CPU: system.switch_cpus: [tid:0] Adding to active threads list
|
||
1500: O3CPU: system.switch_cpus:
|
||
|
||
FullO3CPU: Ticking main, FullO3CPU.
|
||
1500: O3CPU: system.switch_cpus: Scheduling next tick!
|
||
2000: O3CPU: system.switch_cpus:
|
||
|
||
FullO3CPU: Ticking main, FullO3CPU.
|
||
2000: O3CPU: system.switch_cpus: Scheduling next tick!
|
||
2500: O3CPU: system.switch_cpus:
|
||
|
||
...
|
||
|
||
FullO3CPU: Ticking main, FullO3CPU.
|
||
44500: ExecEnable: system.switch_cpus: A0 T0 : @asm_main_after_prologue+12 : movz x0, #0, #0 : IntAlu : D=0x00000000000
|
||
48000: O3CPU: system.switch_cpus: Removing committed instruction [tid:0] PC (0x400084=>0x400088).(0=>1) [sn:1]
|
||
48000: O3CPU: system.switch_cpus: Removing instruction, [tid:0] [sn:1] PC (0x400084=>0x400088).(0=>1)
|
||
48000: O3CPU: system.switch_cpus: Scheduling next tick!
|
||
48500: O3CPU: system.switch_cpus:
|
||
|
||
...</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We can also compare that to the same log but without <code>--fast-forward</code> and other CPU switch options:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> 0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0x1e40 WriteReq
|
||
0: SimpleCPU: system.cpu.dcache_port: received snoop pkt for addr:0x1e30 WriteReq
|
||
0: SimpleCPU: system.cpu: Tick
|
||
0: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue : movz x0, #0, #0 : IntAlu : D=0x0000000000000000 flags=(IsInteger)
|
||
500: SimpleCPU: system.cpu: Tick
|
||
500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+4 : movz x1, #0, #0 : IntAlu : D=0x0000000000000000 flags=(IsInteger)
|
||
1000: SimpleCPU: system.cpu: Tick
|
||
1000: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+8 : m5checkpoint : IntAlu : flags=(IsInteger|IsNonSpeculative|IsUnverifiable)
|
||
1000: SimpleCPU: system.cpu: Resume
|
||
1500: SimpleCPU: system.cpu: Tick
|
||
1500: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+12 : movz x0, #0, #0 : IntAlu : D=0x0000000000000000 flags=(IsInteger)
|
||
2000: SimpleCPU: system.cpu: Tick
|
||
2000: ExecEnable: system.cpu: A0 T0 : @asm_main_after_prologue+16 : m5exit : No_OpClass : flags=(IsInteger|IsNonSpeculative)</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Therefore, it is clear that what we wanted happen:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>up until the tick 1000, <code>SimpleCPU</code> was ticking</p>
|
||
</li>
|
||
<li>
|
||
<p>after tick 1000, cpu <code>O3CPU</code> started ticking</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Bibliography:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://cs.stackexchange.com/questions/69511/what-does-fast-forwarding-mean-in-the-context-of-cpu-simulation" class="bare">https://cs.stackexchange.com/questions/69511/what-does-fast-forwarding-mean-in-the-context-of-cpu-simulation</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>↑ Up: <a href="gem5-restore-checkpoint-with-a-different-cpu.html">gem5 restore checkpoint with a different CPU</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-checkpoint-upgrader.html">gem5 checkpoint upgrader</a> →</p>
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