will this support Raspberry pi 4 about enable_arm_pmu

[thoughtpolice]

I'm afraid I'm not really maintaining this project much anymore, nor did I implement the ARMv8 code. It's unsurprising none of it works on the newer RPi v4.

However, perf should work I believe, and at the moment, you are almost certainly better off using a tool like perf to record cycles, although it's a bit less ideal for "micro" benchmarks in some cases I suppose. (As far as I can tell, these tools should work on any RPi2 or later, as long as the kernel version is 3.18 or later.) If you are using a Debian based distro like Raspbian, something like sudo apt install linux-tools-$(uname -r) should do the trick.

For instance, something like perf stat --repeat=20 -B <command to test> and looking at the cycles count should give you a good approximation of what these tools do, without needing to use out of tree drivers/APIs. (At the time I wrote this code, these features weren't as widely available on the boards I tested, but most boards have perf_events support pretty quickly now.)

[ravipodila]

Thanks

sudo apt install linux-tools-$(uname -r) and perf stat --repeat=20 -B

Works

Just for those people using RPi v4.

It will not support the PERF_COUNT_HW_CPU_CYCLES,

So what i used is
attr.type = PERF_TYPE_SOFTWARE;
attr.config = PERF_COUNT_SW_CPU_CLOCK

If type is PERF_TYPE_SOFTWARE, we are measuring software events provided by the kernel.
PERF_COUNT_SW_CPU_CLOCK: This reports the CPU clock, a high-resolution per-CPU timer.

Try this it works for me .