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My raspi4/8GB is running the 64bit version of Raspberry Pi OS. The linux kernel is 5.4, but perf is only linux-perf-4.19. There seems to be no matching perf version. What am I doing wrong?

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Install linux-perf-5.9 from buster-backports.

How to install Debian packages on Raspbian. Don't forget to replace buster with buster-backports.

You'll have to call perf_5.9 instead of just perf, or modify the perf wrapper script to use perf_5.9 instead of perf_5.4.

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