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| author | Yonghong Song <yhs@fb.com> | 2017-10-05 18:19:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-08 00:05:57 +0200 |
| commit | 4bebdc7a85aa400c0222b5329861e4ad9252f1e5 (patch) | |
| tree | 59151679b652bacaf545664158a85b0a4c7c75fe /samples | |
| parent | bpf: add a test case for helper bpf_perf_event_read_value (diff) | |
| download | linux-4bebdc7a85aa400c0222b5329861e4ad9252f1e5.tar.xz linux-4bebdc7a85aa400c0222b5329861e4ad9252f1e5.zip | |
bpf: add helper bpf_perf_prog_read_value
This patch adds helper bpf_perf_prog_read_cvalue for perf event based bpf
programs, to read event counter and enabled/running time.
The enabled/running time is accumulated since the perf event open.
The typical use case for perf event based bpf program is to attach itself
to a single event. In such cases, if it is desirable to get scaling factor
between two bpf invocations, users can can save the time values in a map,
and use the value from the map and the current value to calculate
the scaling factor.
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')
0 files changed, 0 insertions, 0 deletions