ChanServ changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re
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<tom> Regarding the issue I had the other day with perf stat returning "<not counted>" unless a core was specified, the command works and returns a cycle count with the -a flag (run on all cpus) and the perf stat man page says that this should be a default if no target (cpu) is specified. I could be wrong, but it seems like the implementation might be incorrect. I'll try and investigate it and perhaps submit an issue/PR?
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<Jamie[m]> haha weird
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<marcan> The implementation is correct. This is just a quirk of big.LITTLE systems.
<marcan> there are separate perf counters for big/little so if you actually run on all CPUs you will not get consistent results
<marcan> I think you're confused about what -a does
<marcan> -a means perf the entire system, not just the command you specify
<marcan> Try this if you want to get counters for both CPU types: perf stat -e apple_firestorm_pmu/cycles/ -e apple_icestorm_pmu/cycles/ -e apple_firestorm_pmu/instructions/ -e apple_icestorm_pmu/instructions/ <cmd>
<marcan> use taskset to restrict cmd to specific cores to get consistent results
<marcan> by default you get the little counters (at least on my system) and by default commands will run on the big cores (because they're faster), which is why you get "not counted" with nothing
<marcan> if you do a systemwide trace you're just going to see the global activity on the little cores, which is why it counts
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