[PATCH 1/8] perf/core: Save the dynamic parts of sample data size

From: Namhyung Kim
Date: Wed Jan 18 2023 - 01:21:18 EST


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.

Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Song Liu <song@xxxxxxxxxx>
Tested-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
include/linux/perf_event.h | 2 ++
kernel/events/core.c | 17 ++++++++++-------
2 files changed, 12 insertions(+), 7 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;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index eacc3702654d..8c8de26f04ab 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7593,7 +7593,7 @@ void perf_prepare_sample(struct perf_event_header *header,

size += data->callchain->nr;

- header->size += size * sizeof(u64);
+ data->dyn_size += size * sizeof(u64);
}

if (sample_type & PERF_SAMPLE_RAW) {
@@ -7619,7 +7619,7 @@ void perf_prepare_sample(struct perf_event_header *header,
data->raw = NULL;
}

- header->size += size;
+ data->dyn_size += size;
}

if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
@@ -7631,7 +7631,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += data->br_stack->nr
* sizeof(struct perf_branch_entry);
}
- header->size += size;
+ data->dyn_size += size;
}

if (sample_type & (PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER))
@@ -7646,7 +7646,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += hweight64(mask) * sizeof(u64);
}

- header->size += size;
+ data->dyn_size += size;
}

if (sample_type & PERF_SAMPLE_STACK_USER) {
@@ -7671,7 +7671,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += sizeof(u64) + stack_size;

data->stack_user_size = stack_size;
- header->size += size;
+ data->dyn_size += size;
}

if (filtered_sample_type & PERF_SAMPLE_WEIGHT_TYPE)
@@ -7700,7 +7700,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += hweight64(mask) * sizeof(u64);
}

- header->size += size;
+ data->dyn_size += size;
}

if (sample_type & PERF_SAMPLE_PHYS_ADDR &&
@@ -7745,8 +7745,11 @@ void perf_prepare_sample(struct perf_event_header *header,
size = perf_prepare_sample_aux(event, data, size);

WARN_ON_ONCE(size + header->size > U16_MAX);
- header->size += size;
+ data->dyn_size += size + sizeof(u64); /* size above */
}
+
+ header->size += data->dyn_size;
+
/*
* If you're adding more sample types here, you likely need to do
* something about the overflowing header::size, like repurpose the
--
2.39.0.314.g84b9a713c41-goog