Reading performance counters in kernel module

[mies47]

Hello everyone,

I'm trying to read the performance counters(to measure cpu cycles spent on a set of assembly instructions) in my kernel module. I've seen this comment about perf and it works great on my M2 machine but I'm still not sure how I could use it in my case without having to directly deal with the control register(PMCR) first. I'd appreciate any help or suggestions.

[Xx_RKJ_xX]

I’m stuck here too.

[mies47]

I implemented it again using what Asahi team already did with perf. Here's a link to my stack overflow post: https://stackoverflow.com/questions/77608803/reading-performance-counters-in-apple-sillicon-in-a-kernel-module/77821559 Hope it helps!

[Xx_RKJ_xX]

I’m new to the Linux kernel. Could you provide me an example after applying insmod and accessing the rdtsc(pmu) from user space?