1 #include <linux/ptrace.h> 2 #include <linux/version.h> 3 #include <uapi/linux/bpf.h> 4 #include "bpf_helpers.h" 5 6 struct bpf_map_def SEC("maps") my_map = { 7 .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, 8 .key_size = sizeof(int), 9 .value_size = sizeof(u32), 10 .max_entries = 32, 11 }; 12 13 SEC("kprobe/sys_write") bpf_prog1(struct pt_regs * ctx)14int bpf_prog1(struct pt_regs *ctx) 15 { 16 u64 count; 17 u32 key = bpf_get_smp_processor_id(); 18 char fmt[] = "CPU-%d %llu\n"; 19 20 count = bpf_perf_event_read(&my_map, key); 21 bpf_trace_printk(fmt, sizeof(fmt), key, count); 22 23 return 0; 24 } 25 26 char _license[] SEC("license") = "GPL"; 27 u32 _version SEC("version") = LINUX_VERSION_CODE; 28