[PATCH 04/28] perf bpf: Add defines for map insertion/lookup

Arnaldo Carvalho de Melo
2018-11-22T03:36:39Z

Starting with a helper for a basic pid_map(), a hash using a pid as a
key.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-gdwvq53wltvq6b3g5tdmh0cw@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/include/bpf/bpf.h | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/tools/perf/include/bpf/bpf.h b/tools/perf/include/bpf/bpf.h
index 52b6d87fe822..04ecd425a237 100644
--- a/tools/perf/include/bpf/bpf.h
+++ b/tools/perf/include/bpf/bpf.h
@@ -18,6 +18,17 @@ struct bpf_map {
unsigned int numa_node;
};

+#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 = 512, \
+}
+
+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) \
--
2.14.5