| Kaixu Xia | 47efb30 | 2015-08-06 07:02:36 +0000 | [diff] [blame^] | 1 | #include <linux/version.h> |
| 2 | #include <uapi/linux/bpf.h> |
| 3 | #include "bpf_helpers.h" |
| 4 | |
| 5 | struct bpf_map_def SEC("maps") my_map = { |
| 6 | .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, |
| 7 | .key_size = sizeof(int), |
| 8 | .value_size = sizeof(u32), |
| 9 | .max_entries = 32, |
| 10 | }; |
| 11 | |
| 12 | SEC("kprobe/sys_write") |
| 13 | int bpf_prog1(struct pt_regs *ctx) |
| 14 | { |
| 15 | u64 count; |
| 16 | u32 key = bpf_get_smp_processor_id(); |
| 17 | char fmt[] = "CPU-%d %llu\n"; |
| 18 | |
| 19 | count = bpf_perf_event_read(&my_map, key); |
| 20 | bpf_trace_printk(fmt, sizeof(fmt), key, count); |
| 21 | |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | char _license[] SEC("license") = "GPL"; |
| 26 | u32 _version SEC("version") = LINUX_VERSION_CODE; |