#include <linux/ptrace.h>
  #include <linux/version.h>
  #include <uapi/linux/bpf.h>
  #include "bpf_helpers.h"
  
  struct bpf_map_def SEC("maps") my_map = {
  	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
  	.key_size = sizeof(int),
  	.value_size = sizeof(u32),
  	.max_entries = 32,
  };
  
  SEC("kprobe/sys_write")
  int bpf_prog1(struct pt_regs *ctx)
  {
  	u64 count;
  	u32 key = bpf_get_smp_processor_id();
  	char fmt[] = "CPU-%d   %llu
  ";
  
  	count = bpf_perf_event_read(&my_map, key);
  	bpf_trace_printk(fmt, sizeof(fmt), key, count);
  
  	return 0;
  }
  
  char _license[] SEC("license") = "GPL";
  u32 _version SEC("version") = LINUX_VERSION_CODE;