diff options
| author | Yonghong Song <yhs@fb.com> | 2017-10-05 09:19:21 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-07 23:05:57 +0100 |
| commit | 020a32d9581ac824d038b0b4e24e977e3cc8589f (patch) | |
| tree | f0256aea3e0a98cbba98b91248983b6d90793357 /samples/bpf/tracex6_kern.c | |
| parent | 908432ca84fc229e906ba164219e9ad0fe56f755 (diff) | |
| download | linux-020a32d9581ac824d038b0b4e24e977e3cc8589f.tar.bz2 | |
bpf: add a test case for helper bpf_perf_event_read_value
The bpf sample program tracex6 is enhanced to use the new
helper to read enabled/running time as well.
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/tracex6_kern.c')
| -rw-r--r-- | samples/bpf/tracex6_kern.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/samples/bpf/tracex6_kern.c b/samples/bpf/tracex6_kern.c index e7d180305974..46c557afac73 100644 --- a/samples/bpf/tracex6_kern.c +++ b/samples/bpf/tracex6_kern.c @@ -15,6 +15,12 @@ struct bpf_map_def SEC("maps") values = { .value_size = sizeof(u64), .max_entries = 64, }; +struct bpf_map_def SEC("maps") values2 = { + .type = BPF_MAP_TYPE_HASH, + .key_size = sizeof(int), + .value_size = sizeof(struct bpf_perf_event_value), + .max_entries = 64, +}; SEC("kprobe/htab_map_get_next_key") int bpf_prog1(struct pt_regs *ctx) @@ -37,5 +43,25 @@ int bpf_prog1(struct pt_regs *ctx) 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; |