0001 #include <linux/ptrace.h>
0002 #include <linux/version.h>
0003 #include <uapi/linux/bpf.h>
0004 #include <bpf/bpf_helpers.h>
0005
0006 struct {
0007 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
0008 __uint(key_size, sizeof(int));
0009 __uint(value_size, sizeof(u32));
0010 __uint(max_entries, 64);
0011 } counters SEC(".maps");
0012
0013 struct {
0014 __uint(type, BPF_MAP_TYPE_HASH);
0015 __type(key, int);
0016 __type(value, u64);
0017 __uint(max_entries, 64);
0018 } values SEC(".maps");
0019
0020 struct {
0021 __uint(type, BPF_MAP_TYPE_HASH);
0022 __type(key, int);
0023 __type(value, struct bpf_perf_event_value);
0024 __uint(max_entries, 64);
0025 } values2 SEC(".maps");
0026
0027 SEC("kprobe/htab_map_get_next_key")
0028 int bpf_prog1(struct pt_regs *ctx)
0029 {
0030 u32 key = bpf_get_smp_processor_id();
0031 u64 count, *val;
0032 s64 error;
0033
0034 count = bpf_perf_event_read(&counters, key);
0035 error = (s64)count;
0036 if (error <= -2 && error >= -22)
0037 return 0;
0038
0039 val = bpf_map_lookup_elem(&values, &key);
0040 if (val)
0041 *val = count;
0042 else
0043 bpf_map_update_elem(&values, &key, &count, BPF_NOEXIST);
0044
0045 return 0;
0046 }
0047
0048 SEC("kprobe/htab_map_lookup_elem")
0049 int bpf_prog2(struct pt_regs *ctx)
0050 {
0051 u32 key = bpf_get_smp_processor_id();
0052 struct bpf_perf_event_value *val, buf;
0053 int error;
0054
0055 error = bpf_perf_event_read_value(&counters, key, &buf, sizeof(buf));
0056 if (error)
0057 return 0;
0058
0059 val = bpf_map_lookup_elem(&values2, &key);
0060 if (val)
0061 *val = buf;
0062 else
0063 bpf_map_update_elem(&values2, &key, &buf, BPF_NOEXIST);
0064
0065 return 0;
0066 }
0067
0068 char _license[] SEC("license") = "GPL";
0069 u32 _version SEC("version") = LINUX_VERSION_CODE;
