[iovisor-dev] read perf counters

[riya khanna via iovisor-dev]

Hi,

I'm trying to read perf counters using bpf. However, adding
BPF_PERF_ARRAY reports error:

bpf: Invalid argument
unrecognized bpf_ld_imm64 inns

Is there an example/sample to read perf counters  that I can follow?
The code below is what I'm trying to execute.

Thanks,
Riya

# load BPF program

bpf_text = """

#include <uapi/linux/ptrace.h>

BPF_PERF_ARRAY(my_map, 32);

int start_counting(struct pt_regs *ctx) {

    if (!PT_REGS_PARM1(ctx))

        return 0;

    u64 count;

    u32 key = bpf_get_smp_processor_id();

    count = bpf_perf_event_read(&my_map, key);

    bpf_trace_printk("CPU-%d %llu", key, count);

    return 0;

}

"""
_______________________________________________
iovisor-dev mailing list
iovisor-dev@lists.iovisor.org
https://lists.iovisor.org/mailman/listinfo/iovisor-dev