perf bpf: Add defines for map insertion/lookup

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message Nov 22, 2018 perf events

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2018-11-22 07:02 UTC #0 lore raw

Commit-ID:  382b55dbef6b68e3fef2fd8a438fbaff57695308
Gitweb:     https://git.kernel.org/tip/382b55dbef6b68e3fef2fd8a438fbaff57695308
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 6 Nov 2018 15:46:27 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Wed, 21 Nov 2018 12:00:31 -0300

perf bpf: Add defines for map insertion/lookup

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

Cc Adrian Hunter <[email protected]>

Cc David Ahern <[email protected]>

Cc Jiri Olsa <[email protected]>

Cc Namhyung Kim <[email protected]>

Cc Wang Nan <[email protected]>

Link https://lkml.kernel.org/n/[email protected] open here

Signed-off-by Arnaldo Carvalho de Melo <[email protected]>

---
 tools/perf/include/bpf/bpf.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

tools/perf/include/bpf/bpf.h +11 -0

index 52b6d87fe822..04ecd425a237 100644
@@ -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) \