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- #include <linux/ptrace.h>
- #include <linux/version.h>
- #include <uapi/linux/bpf.h>
- #include <bpf/bpf_helpers.h>
- struct {
- __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
- __uint(key_size, sizeof(int));
- __uint(value_size, sizeof(u32));
- __uint(max_entries, 64);
- } counters SEC(".maps");
- struct {
- __uint(type, BPF_MAP_TYPE_HASH);
- __type(key, int);
- __type(value, u64);
- __uint(max_entries, 64);
- } values SEC(".maps");
- struct {
- __uint(type, BPF_MAP_TYPE_HASH);
- __type(key, int);
- __type(value, struct bpf_perf_event_value);
- __uint(max_entries, 64);
- } values2 SEC(".maps");
- SEC("kprobe/htab_map_get_next_key")
- int bpf_prog1(struct pt_regs *ctx)
- {
- u32 key = bpf_get_smp_processor_id();
- u64 count, *val;
- s64 error;
- count = bpf_perf_event_read(&counters, key);
- error = (s64)count;
- if (error <= -2 && error >= -22)
- return 0;
- val = bpf_map_lookup_elem(&values, &key);
- if (val)
- *val = count;
- else
- bpf_map_update_elem(&values, &key, &count, BPF_NOEXIST);
- return 0;
- }
- SEC("kprobe/htab_map_lookup_elem")
- int bpf_prog2(struct pt_regs *ctx)
- {
- u32 key = bpf_get_smp_processor_id();
- struct bpf_perf_event_value *val, buf;
- int error;
- error = bpf_perf_event_read_value(&counters, key, &buf, sizeof(buf));
- if (error)
- return 0;
- val = bpf_map_lookup_elem(&values2, &key);
- if (val)
- *val = buf;
- else
- bpf_map_update_elem(&values2, &key, &buf, BPF_NOEXIST);
- return 0;
- }
- char _license[] SEC("license") = "GPL";
- u32 _version SEC("version") = LINUX_VERSION_CODE;
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