diff options
Diffstat (limited to 'tools/perf/include/bpf/bpf.h')
| -rw-r--r-- | tools/perf/include/bpf/bpf.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/include/bpf/bpf.h b/tools/perf/include/bpf/bpf.h index 52b6d87fe822..e667577207dc 100644 --- a/tools/perf/include/bpf/bpf.h +++ b/tools/perf/include/bpf/bpf.h @@ -18,6 +18,25 @@ struct bpf_map { unsigned int numa_node; }; +/* + * FIXME: this should receive .max_entries as a parameter, as careful + * tuning of these limits is needed to avoid hitting limits that + * prevents other BPF constructs, such as tracepoint handlers, + * to get installed, with cryptic messages from libbpf, etc. + * For the current need, 'perf trace --filter-pids', 64 should + * be good enough, but this surely needs to be revisited. + */ +#define pid_map(name, value_type) \ +struct bpf_map SEC("maps") name = { \ + .type = BPF_MAP_TYPE_HASH, \ + .key_size = sizeof(pid_t), \ + .value_size = sizeof(value_type), \ + .max_entries = 64, \ +} + +static int (*bpf_map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags) = (void *)BPF_FUNC_map_update_elem; +static void *(*bpf_map_lookup_elem)(struct bpf_map *map, void *key) = (void *)BPF_FUNC_map_lookup_elem; + #define SEC(NAME) __attribute__((section(NAME), used)) #define probe(function, vars) \ @@ -36,4 +55,6 @@ int _version SEC("version") = LINUX_VERSION_CODE; static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read; static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str; +static int (*perf_event_output)(void *, struct bpf_map *, int, void *, unsigned long) = (void *)BPF_FUNC_perf_event_output; + #endif /* _PERF_BPF_H */ |