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authorNamhyung Kim <namhyung@kernel.org>2023-01-18 09:05:52 +0300
committerIngo Molnar <mingo@kernel.org>2023-01-18 13:57:19 +0300
commit4cf7a136115e96241f9f1089d2b53c47accf3823 (patch)
treeff5a1458b75ba4582594974c05d46680797f3914 /include/linux/perf_event.h
parent65adf3a57c0c2e79c5c2b72a4bdcabcab9e99ec1 (diff)
downloadlinux-4cf7a136115e96241f9f1089d2b53c47accf3823.tar.xz
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.h2
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;