diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2023-01-17 22:05:52 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-01-18 11:57:19 +0100 |
| commit | 4cf7a136115e96241f9f1089d2b53c47accf3823 (patch) | |
| tree | ff5a1458b75ba4582594974c05d46680797f3914 /include/linux/perf_event.h | |
| parent | 65adf3a57c0c2e79c5c2b72a4bdcabcab9e99ec1 (diff) | |
perf/core: Save the dynamic parts of sample data size
The perf sample data can be divided into parts. The event->header_size
and event->id_header_size keep the static part of the sample data which
is determined by the sample_type flags.
But other parts like CALLCHAIN and BRANCH_STACK are changing dynamically
so it needs to see the actual data. In preparation of handling repeated
calls for perf_prepare_sample(), it can save the dynamic size to the
perf sample data to avoid the duplicate work.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230118060559.615653-2-namhyung@kernel.org
Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 03949d017ac9..16b980014449 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1103,6 +1103,7 @@ struct perf_sample_data { */ u64 sample_flags; u64 period; + u64 dyn_size; /* * Fields commonly set by __perf_event_header__init_id(), @@ -1158,6 +1159,7 @@ static inline void perf_sample_data_init(struct perf_sample_data *data, /* remaining struct members initialized in perf_prepare_sample() */ data->sample_flags = PERF_SAMPLE_PERIOD; data->period = period; + data->dyn_size = 0; if (addr) { data->addr = addr; |